MXPA99010110A - Acidic limescale removal compositions - Google Patents

Abstract

The present invention relates to liquid acidic thickened compositions having a viscosity of at least 10 m Pa s, when measured with a Carrimed rheometer at 5 N/m2 at 20°C, and a pH below 4, said composition comprising a thickening system comprising a zwitterionic surfactant and an anionic surfactant at a weight ratio of said zwitterionic surfactant to said anionic surfactant of at least 2:1, and from 0.1%to 70%by weight of the total composition of an acid. Said compositions deliver excellent limescale removal performance as well as outstanding greasy soap scum cleaning on hard-surfaces. The compositions are suitable for the cleaning of non-horizontal and horizontal surfaces.

Description

SYSTEM AND PROCEDURE FOR SUPPLYING FLUID IN HERMETIC CIRCUITS FIELD OF THE INVENTION The present invention relates to a system and method for obtaining vacuum and for supplying a fluid in hermetic circuits, particularly applied in cooling circuits of refrigeration appliances, such as refrigerators, freezers and air conditioners.

BACKGROUND OF THE INVENTION The cooling apparatuses have a cooling circuit pressurized with a cooling fluid, for example, sobutane, which must be incorporated in this circuit free of impurities and moisture, to avoid, for example, the oxidation of the components included within the airtight housing of the refrigerant. compressor of said refrigeration appliances. Before supplying the refrigerant fluid, it is necessary to subject the refrigeration circuit to a certain vacuum condition. This vacuum condition is achieved in a production unit, where each type of refrigeration appliance, for example a freezer or an air conditioner, is processed in a specific vacuum system (of the carousel type or of a single way), which is connected to the vacuum pumps for a certain time, to subject it to a depressurization and dehydration procedure, before being driven to a supply station, where it will receive an appropriate load of refrigerant fluid. To receive the refrigerant fluid, each refrigeration apparatus is disconnected from the respective vacuum pump and connected individually to a refrigerant fluid supply station in a step subsequent to the vacuum production process. The vacuum can be obtained only on the low pressure side of the cooling circuit of the cooling apparatus or, simultaneously, on both sides of said circuit, both on the high pressure side and the low pressure side; this choice is based on the time available for the procedure and the level of vacuum that will be obtained. In order to be driven to the supply station, each refrigeration unit of the vacuum station is switched off after the programmed time for obtaining said vacuum has elapsed. However, the disconnections of the vacuum stations generally cause slight pressure failures in the refrigeration circuit, therefore, a vacuum recovery is needed just after the connection at the supply station, which is why the Supply stations are equipped with an additional vacuum pump. In other known processes, vacuum production occurs in a vacuum production unit, where several units of vacuum Refrigeration is connected to a simple vacuum pump, high capacity, or by means of multiple vacuum production units, where each has a pump with a sufficient capacity for a simple refrigeration unit. In all such systems, each unit of the refrigeration apparatus is disconnected from the respective vacuum pump and subsequently connected to the refrigerant supply station to receive the respective charge of said fluid. The procedures to produce vacuum and to supply the refrigerant fluid in the refrigeration appliances have some deficiencies, such as the lack of vacuum during the successive disconnections, the contamination of the refrigeration circuit due to humidity, due to the lack of vacuum, therefore A new vacuum production step is required before the refrigeration unit receives the refrigerant charge. Each new vacuum production step for a refrigeration appliance requires the closure in the production line of the vacuum production unit, to avoid that the hermetic circuits, which have already been processed and provided with a certain value of vacuum, are maintain a prolonged time without the respective load of refrigerant fluid, whose condition can be altered, allowing over time, the humidity to penetrate inside the refrigeration circuit.

Another deficiency of the known techniques refers to the same processing time so that all cooling apparatuses are processed to obtain the vacuum and the supply of cooling fluid.

DESCRIPTION OF THE INVENTION Therefore, it is an object of the present invention to provide a system for supplying a fluid in hermetic systems which, in a simple production unit, allows obtaining the vacuum and the immediate supply of cooling fluid for the different lines of refrigeration appliances. . Another objective of the present invention is to provide a method for supplying a fluid to the hermetic systems, which avoids the possibility of lack of vacuum in the refrigeration apparatuses in which the vacuum has already been produced and which also avoids the need for additional steps to obtain vacuum in the refrigeration appliances, therefore, that additionally eliminate the interruptions in the procedure to obtain vacuum and refrigerant supply in the production line. An additional objective is to provide a system and a procedure for supplying a refrigerant fluid, which allows to differentiate the time of each operative step in the production line, as a function of the needs of each mentioned step, or of the production times required for Each type of refrigeration appliance.

Another object of the invention is to provide a method, such as the one mentioned above, that minimizes the possibility of contaminating the cooling circuit that will receive the cooling fluid. These and other objectives are achieved by means of a system for supplying a fluid in hermetic circuits, consisting of: a plurality of processing cells, which will individually receive a hermetic circuit; a plurality of connection means, each of which is mounted to its respective processing cell and which can be connected to the hermetic circuit received therein and connected to a vacuum pump and a fluid supply source, to subject said hermetic circuit selectively and consecutively to the vacuum and to the fluid supply conditions; and a control unit that is operatively connected to each connection means, to control the operation of the connection means and thereby selectively and consecutively produce in the hermetic circuit the desired conditions of vacuum and fluid supply. The objects of the present invention are additionally achieved by means of a method for supplying a fluid in hermetic circuits, which consists of the following steps: a) placing a hermetic circuit in a processing cell; b) connecting the hermetic circuit within a processing cell to the respective connection means connected to a vacuum pump and to a fluid supply source; c) provide a selective and consecutive fluid communication of the connection means to the vacuum pump and to a fluid supply source respective, to direct the production of vacuum in said hermetic circuit; and d) directing in the processing cell where the hermetic circuit is located, the supply of a fluid charge to said hermetic circuit, after a certain condition of vacuum has been obtained in the latter.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described with reference to the accompanying drawings, in which: Figure 1 illustrates, schematically and in block diagram, a production line for obtaining vacuum and the supply of cooling fluid in the hermetic circuits of apparatus for refrigeration, constructed in accordance with the present invention; Figure 2 illustrates, schematically, part of the production line shown in Figure 1; Figure 3 illustrates, schematically and in block diagram, the processing steps for the operation of the system to supply the refrigerant fluid of the present invention; and Figure 4 illustrates a pressure-time variation curve, as a reference for the operation of the system to obtain the vacuum and the fluid supply of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system and method for supplying fluids in hermetic circuits 1, such as the refrigeration circuits of a refrigeration apparatus provided with a hermetic compressor. In the fluid supply system of the present invention each hermetic circuit 1 is initially subjected to a vacuum condition and subsequently, without moving said hermetic circuit 1 from its place, it is subjected to a supply condition, in which a some refrigerant fluid charge, which is calculated as a function of each type of refrigeration device that has been processed. According to the present invention and with the illustrations in the attached drawings, the system for supplying the fluid in hermetic circuits consists of a plurality of processing cells or nacelles 10, which for example can be programmed, so that each one receives, individual and consecutively, a hermetic circuit 1 to be initially subjected to a vacuum condition and subsequently, in the same processing cell 10 in which the vacuum condition has been obtained, to a fluid supply condition, which is calculated as a function of the type of hermetic circuit 1 that is processed and that has been initially identified by a reading unit 20 operatively connected to a control unit 30, as mentioned below.

In accordance with the present invention, each hermetic circuit 1 to be processed is conducted to a receiving position 40, for example, by means of a belt conveyor, wherein the reading unit 20, for example, an optical reader bar code, identifies each hermetic circuit 1 received therein, said identification informing the control unit 30, which will determine the conduction of the hermetic circuit identified to a respective processing cell 10, where it will be subjected to a previously established vacuum condition and subsequently to a refrigerant charge. The optical reading identifies the code of the hermetic circuit 1, its type of compressor and the conditions of vacuum and fluid load that a processing cell 10 must provide to allow said sealed hermetic circuit 1 to be processed. The data read by the reading unit 20 is sent to the control unit 30 which has, stored in a memory unit 31, the process parameters which are known previously and are defined for each type of hermetic circuit 1 and which are they will use to carry out the processing of each different type of hermetic circuit 1, for a future evaluation of the result of this processing by means of the control unit 30. Each hermetic circuit 1 is led, individually, to a respective processing cell 10 , by means of transportation means 50, which move between a receiving position 40 and a position of laying 45 in a respective processing cell 10, which is vacant and determined by the control unit 30. According to one embodiment of the present invention, the transportation means 50 is in the form of a transport carriage, which is it slides on guide rails 51 communicating between the receiving position 40 and the exit position 60 in which each sealed circuit 1 already processed is removed from the present system. These operations are directed by the control unit 30, which determines the displacement of said hermetic circuits according to one of the operating time interval conditions and detection of the position of each hermetic circuit 1 in different previously established operating positions; said detection is presented by means of a plurality of sensors (not illustrated). According to an embodiment of the present invention, identification of each hermetic circuit 1 in the transportation means is presented., which carry the reading unit 20. It should be understood that, according to the present invention, the refrigerant fluid supply system can include, in each processing cell 10, a respective reading unit 20, which is operatively connected to the control unit 30 and the fourth identifies, either automatically or manually, a hermetic circuit 1 driven to a respective processing cell 10 and sends this data to the control unit 30. The reading unit 20 can be fixed to the part in which is provided the same or well, that can be movable, such as a remote control reader unit manually activated by an operator. The fluid supply system of the present invention additionally has an occupancy identification means 11, for example in the form of a presence sensor provided in each of the processing cells 10 and operatively connected to the control unit 30. , to indicate to the latter the existence of a processing cell 10 which is vacant to receive a hermetic circuit 1 to be processed. According to the present invention, after identifying a hermetic circuit 1 by means of the reading unit 20, the control unit 30 programs a processing cell 10, indicated as vacant, with the characteristics of said hermetic circuit 1 to be processed, making this processing cell 10 capable of receiving and processing said hermetic circuit 1. In another embodiment for carrying out the present invention, the identification means are activated manually by means of an operator. The characteristics associated with each hermetic circuit 1 are previously reported to the control unit 30 which stores this data in a memory unit 31, which in turn, also stores the data in relation to each hermetic circuit 1 identified and with the data of processing thereof. After identifying the hermetic circuit 1 to be processed, the control unit 30 directs, for example, simultaneously with the order to drive this hermetic circuit 1 with the transportation means 50 to a processing cell 10, a respective fluid supply source 70, for example to supply the pressurized refrigerant fluid, to send a determined mass of refrigerant fluid under a given pressure to the processing cell 10 which will receive the hermetic circuit 1 identified by the control unit 30. The fluid supply conditions are previously established and known by the control unit 30, according to each type of hermetic circuit 1 which will be indicted. According to the present invention, a simple fluid supply source 70 can be programmed to supply consecutively or simultaneously a certain number of processing cells with hermetic circuits that require different loads. However, it should be understood that the fluid supply system of the present invention may have a plurality of supply sources 20, each which can be connected to at least one processing cell 10. When the instruction is sent to conduct a Hermetic circuit 1 to a certain processing cell 10, the control unit 30 further controls the energization of a respective connection means 80 contained within the processing cell 10 which is capable of receiving a hermetic circuit 1 and which can start, the arrival of the hermetic circuit 1 the vacuum production process and the subsequent supply of cooling fluid. The instruction for energization can also start when the circuit hermetic 1 arrives at the respective processing cell 10 in which it will be processed. Each connection means 80 is mounted to a respective processing cell 10 and can be connected to the hermetic circuit 1 that is received inside it and is operatively associated with a vacuum pump 12, a vacuum valve 13 and a supply source respective fluid 70, to selectively and consecutively subject each hermetic circuit 1 received in the processing cell 10 to the vacuum and pressurization conditions. Each connection means 80 is operatively connected to the control unit 30, to be controlled by the latter to selectively and consecutively produce in the hermetic circuit 1 the desired vacuum and supply conditions. Each connecting means 80 is in the form of a manifold, having a vacuum terminal 81 connected to a respective vacuum pump 12 of the processing cell 10 where it is located, and is provided with a first valve element 82 that selectively allows fluid communication between the vacuum pump 12 and the hermetic circuit 1; a pressurization terminal 83, connected to the fluid supply source 70 and provided with a second valve member 84 that selectively permits fluid communication between the fluid supply source 70 and the hermetic circuit 1 and at least one terminal evacuation and load 85, which can be connected to a nozzle provided in the hermetic circuit 1 by selectively connecting each of the parts defined by the vacuum pump 12 and the fluid supply source 70 to said hermetic circuit 1, when one of the first and second valve elements 82, 84, allows the respective fluid communication with this hermetic circuit 1. According to the present invention, since the hermetic circuit 1 is a hermetic cooling circuit 1, having a nozzle on the high pressure side and a nozzle on the low pressure side of the compressor, the connecting means 80 having a pair of evacuation terminals 85, and load 86, one of which is mounted on the low pressure side of the circuit and provided with a third valve element 87, while the other is mounted on the high pressure side of the circuit and provided with a fourth valve element 88. After each hermetic circuit 1 is processed and arrives at a respective processing cell 10, the control unit 30 initially directs the opening of the first valve element 82 of at least one of the elements Valve numbers 87, and fourth 88, as well as the activation of a respective vacuum pump 13, which will act in the cooling circuit of the hermetic circuit 1, until a previously determined predetermined vacuum condition has been obtained. According to the present invention, each processing cell 10 includes a respective vacuum pump 12. As the hermetic circuit is a refrigeration circuit consisting of a hermetic compressor, during the evacuation procedure, the control unit 30 simultaneously drives with the opening of the first and third valve elements 82 and 87, the opening of the fourth element of valve 88, allowing vacuum to be obtained on both sides, both on the high pressure side and on the low pressure side of the refrigerant hermetic circuit 1. During actuation of the vacuum pump 12, the control unit 30 is it keeps deactivated, and therefore in its respective generally closed condition, a second valve element 84, preventing fluid communication between the supply source 70 and the hermetic circuit 1 that has been evacuated. Each processing unit 10 additionally has a vacuum valve 13, for example of electronic type, which informs the control unit 30 of the different pressure conditions to be measured in the cooling circuit. In a constructive embodiment of the present invention, as a function of the hermetic circuit characteristics 1 identified by the reading unit of 20, the control unit 30 determines to conduct this circuit to a processing cell 10 which is suitable for operation with that specific type of hermetic circuit 1. Upon arrival of a hermetic circuit 1 in a respective processing cell 10 programmed to receive it, an operator promotes the coupling of each terminal of a corresponding connecting means 80 with the nozzles of the high sides. and low pressure of the hermetic circuit 1, indicating, for example, manually, the coupling condition, to then allow the control unit 30 to instruct the opening of the first and fourth valve elements of the connecting means, as well as the activation of the vacuum pump 12. The indication of the coupling, in another constructive mode, can be carried out automatically, for example after an interval has elapsed of certain time after coupling. The control unit 30 stores the data in relation to the total procedure executed in each hermetic circuit 1 in a database in its memory unit 31 and uses said data in statistical analysis of the procedure and to track each hermetic circuit 1 which is going to be processed. Upon obtaining the desired vacuum condition in each hermetic circuit 1, the control unit 30 sends command signals to the first, third and / or fourth valve elements 82, 87 and 88, directing the closure thereof, as well as the pump of vacuum 12, deactivating it. The control unit 30 then directs the opening of the second, third and / or fourth valve elements 82, 87 and 88, as well as the supply of the fluid by means of the fluid supply source 70. After each hermetic circuit 1 has received the appropriate charge of cooling fluid, the processing cell 10 sends this information to the control unit 30, which compares this information with the data in its database and subsequently determines whether the supply condition that has been reached is the desired for said hermetic circuit 1.

With the completion of the supply of fluid to the hermetic circuit 1, a circuit closure means, not polished, that closes each one of the nozzles of the hermetic circuit 1, thus interrupting the communication of fluids between said hermetic circuit 1 and the environment of the same. As a function of the analysis performed between the data received from the processing cell 10 and those obtained in its memory unit 31, the control unit 30 directs the transportation means 50 to remove the processed hermetic circuit 1 from the processing cell. 10 in which it is located and which leads it to the exit position 60 or, alternatively, to a rejection unit 61, where each processed hermetic circuit 1 that does not present a desired fluid supply condition in accordance with the data available in the control unit 30. After the valve elements of the connecting means 80 are closed, the operator, or the control unit 30, activates a command that directs the release of the sealed hermetic circuit 1, so that the transportation means 50 take said hermetic circuit 1 from the processing cell 10 where it is located. For the acceptance or rejection of each hermetic circuit 1 in a processing cell 10, during the procedure for supplying the fluid to said hermetic circuit 1, the measurements of the pressure condition in the cooling circuit of said hermetic circuit 1 are made, whose measurements will indicate, initially, the conditions of vacuum and pressure existing in that circuit, so that they are compared with the data previously defined as suitable in the control unit 30. In a first stage of processing to obtain the vacuum in the hermetic circuit 1 that will be supplied with the fluid, after connecting to this circuit the respective connection means 80 of the processing cell 10 in which said circuit is located, the control unit 30 directs the opening of the first and third or fourth valve elements 82, 87 and 88 of the connection means 80 , allowing the communication of fluids between the vacuum pump 12 and the hermetic circuit 1. During this processing step, the rejection of the hermetic circuits 1 is presented which, during the first verification stage, which is carried out after a time interval t1 for driving the vacuum pump 12 has elapsed and in which the vacuum valve 13 detects leakage and / or humidity in the cooling circuit n, does not reach a pressure that is less than or equal to a determined value pl, capable of being detected by the vacuum valve 13 during the time interval t1. The pressure pl is the pressure to check the leakage and / or humidity present in the cooling circuit of the hermetic circuit 1 that has been processed in a specific processing cell 10. The pressures higher than the pl detected by the vacuum valve 13 the control unit 30 is informed, which sends an instruction to the processing cell 10 to interrupt the processing of the hermetic circuit 1 with the pressure pl, e directs the transportation means 50 to the processing cell 10 with this hermetic circuit 1, to later determine that the latter will be conducted to the reject unit 61 by the transportation means 50. The control unit 30 will direct the processing of each hermetic circuit 1 in the respective processing cell 10, since it is It is reported that, after the time interval t1 has elapsed, the pressure measured by the vacuum valve 13 is as a maximum, equal to the pressure pl. After this first verification of the processing condition of each hermetic circuit 1, the control unit 30 directs the first valve element 82 to be kept open, allowing the fluid communication between the vacuum pump 12 and the circulation circuit to continue. cooling of the hermetic circuit 1 to be processed. After a time interval of operation of the vacuum pump 12 has elapsed, the control unit 30 performs a second verification of the processing condition, in which the data received from the vacuum valve 13 and in relation to the measurement of the second pressure in the cooling circuit of the hermetic circuit 1 are analyzed. will be processed, said second pressure measurement carried out in the time interval t2, in which the pressure in said cooling circuit should be, at most, equal to p2, p2 being the lowest pressure of the cooling circuit for the type of hermetic circuit 1 to be processed. During the time interval between t1 and t2, the hermetic circuit 1 that is being processing is conducted to a vacuum condition, which will be reached in time interval t2. If the pressure measured in the time interval t2 is higher than p2, the control unit 30 will direct the processing cell 10 operating with said hermetic circuit 1 to reject the latter, as in the first condition of verification, for the time interval t1, since it considers that the hermetic circuit 1 is like an unwanted condition of vacuum and / or humidity. When a vacuum pressure considered acceptable by the control unit 30 is reached, the latter directs the closure of the first, third and / or fourth valve elements 82, 87, 88, interrupting fluid communication between the vacuum pump 12 and the cooling circuit of the hermetic circuit 1 in the processing cell 10. When a certain time interval has elapsed to close the first, third and / or fourth valve elements 82, 87, and 88, the control unit 30 directs to the vacuum valve 13 measuring the pressure in the hermetic circuit 1 during a time interval t3. In this third verification of the processing condition, the control unit 30 will verify the pressurization condition of the hermetic circuit 1 that is being processed and which has been positively evaluated in the previous verification steps, analyzing the pressure measured by the valve vacuum 13 in time interval t3, when the pressure in said refrigeration circuit being processed should have a value at a maximum equal to p3, p3 being greater than p2 and p1. The values of the pressure in this verification step greater than p3 cause the control unit 30 to order the rejection of the hermetic circuit 1, as previously described in relation to the first and second verification step (figure 4). If the pressure p that was measured during the time interval t3 is less than p3, the control unit 30 directs the vacuum pump or valve 12 to produce a vacuum condition in the cooling circuit to conduct that pressure to a maximum value equal to the pressure t2 in a given processing time interval. In a time interval t4, sufficient to allow the pressure in the cooling circuit to be processed to reach the pressure at a maximum equal to p2, the vacuum valve 3 sends to the control unit 30 a signal corresponding to the pressure reached in said cooling circuit, said control unit 30 subsequently directs the supply for the refrigeration circuit with a determined charge of cooling fluid, which is appropriate for the hermetic circuit 1 to be processed. The system and the procedure for supplying the fluid in hermetic circuits of the present invention allows the prolonged interruptions between the vacuum production and fluid supply processes of each hermetic circuit 1 to be completely eliminated, eliminating the prior art vacuum shortages resulting from these process interruptions , thus eliminating the contamination by moisture and m improving the quality of the final hermetic circuit 1.

Moreover, the system for obtaining the vacuum and the fluid supply of the present invention no longer requires a previous separation of the hermetic circuits 1 that present the same processing characteristics, since they allow to identify these characteristics and therefore lead specifically to the hermetic circuits 1 to a processing cell which is suitable for processing said hermetic circuits 1. Additionally, the hermetic circuits 1, which are already in a vacuum condition, are no longer required to wait for a future fluid supply in another unit , which in the past allowed the lack of vacuum and moisture penetration in the cooling circuit. To avoid this, by removing an hermetic circuit 1 from a respective processing cell 10 in which a fluid charge is received., that a certain mass of said fluid that was found in the connection means 80 of said processing cell 10 and between the valve elements of said connection means 80 escape into the atmosphere, each connection means 80 includes a third element of valve 89, which operatively and selectively couples to fluid recovery means, not illustrated, for example by the instruction of the control unit 30 after closing the first, second, third and fourth valve elements 82, 84, 87 and 88 and for example, before a sealed circuit 1 which already contains a respective fluid charge is removed from the processing cell 10. It should be understood that the opening and closing of the first valve element 89 can be performed manually.

As a function of the above characteristics, the system for obtaining the vacuum and refrigerant fluid supply of the present invention allows the use of various cooling fluids, with no possibility of leakage of said fluid into the atmosphere.

Claims (23)

NOVELTY OF THE INVENTION CLAIMS

1. - A system for supplying fluid in hermetic circuits, characterized in that it consists of: a plurality of processing cells (10), which will receive, individually, a hermetic circuit (1); a plurality of connection means (80), which are each mounted to a respective processing cell (10) and which are connected to the hermetic circuit (1) received therein and connected to a vacuum pump (12) and a fluid supply source (70) for selectively and consecutively subjecting said hermetic circuit to vacuum and fluid supply conditions; and a control unit (30) that is operatively connected to each of the connection means (80), to control the operation of the connection means (80), to selectively and consecutively produce in the hermetic circuit (1) the desired conditions of vacuum and fluid supply.

2. The system according to claim 1, further characterized in that it comprises: occupation identification means (32) that are operatively coupled to each processing cell (10) and control unit (30), to inform the latter on the occupation condition of each processing cell (10); and transportation means (50) that are arranged in such a way that they conduct an hermetic circuit (1) between a receiving position of the hermetic circuit (1) and a positioning position of the hermetic circuit (1) in the processing cell 10, which is vacant and identified by the control unit 30.

3. - The system according to claim 2, further characterized in that the control unit (30) directs the transport means (50) leading each hermetic circuit (1), already received in said receiving position, to a processing cell respective one identified as vacant,

4. The system according to claim 2, further characterized in that the transportation means (50) slide on guide rails (51).

5. The system according to claim 2, further characterized in that the occupation identification means (32) are constituted by presence sensing means, to indicate the presence of a hermetic circuit (1) in a respective processing cell ( 10).

6. The system according to any of claims 1, 2 or 3, further characterized in that it consists of at least one reader unit 20 that is operatively associated with the control unit 30, to identify each hermetic circuit 1 that will be processed in a processing cell (10).

7. - The system according to claim 6, further characterized in that the processing cell 10 is operatively connected to a respective reading unit (20).

8. The system according to claim 6, further characterized in that each reader unit (20) informs the control unit (30) about the identification characteristics of a hermetic circuit (1) that will be processed, by one of the conditions of manual and automatic activation.

9. The system according to claim 6, further characterized in that the reading unit (20) identifies each hermetic circuit (1) received in a receiving condition of the transportation means (50).

10. The system according to claim 9, further characterized in that the reading unit (20) is placed in the transportation means (50).

11. The system according to claim 1, further characterized in that each connection means (80) is operatively associated with a vacuum valve which informs the control unit (30) the conditions of vacuum and pressure to the which each hermetic circuit (1) is subjected when coupled to the connection means (80) of a processing cell (10).

12. - The system according to claim 11, further characterized in that each processing cell is operatively associated with a respective vacuum pump number 12.

13. The system according to claim 12, further characterized in that each connection means (80 ) consists of a vacuum terminal (81) which is selectively connected to a respective vacuum pump 12 through a first valve element (82); a pressurization terminal (83) that is selectively connected to a respective supply source (70) by means of a second valve element (84), and at least one evacuation and load terminal (85) that can be selectively connected and manually with a nozzle provided in the hermetic circuit (1).

14. The system according to claim 13, wherein each hermetic circuit (1) which is a circuit of a refrigeration apparatus including a compressor, further characterized in that each connection means (80) consists of a pair of evacuation terminals. and load (85, 86,) which are respectively provided with a third and fourth valve element (87, 88), one of which can be connected to a nozzle on a low pressure side or the cooling circuit and the another to a nozzle on the high pressure side of said circuit.

15. The system according to claim 14, further characterized in that each connection means (80) consists of a fifth valve element (89), selectively connecting the means respective connection (80) with a refrigerant fluid recovery circuit, when the first, second, third and fourth valve elements (82, 84, 87, 88) are closed.

16. A process for the supply of fluid in hermetic compressors, further characterized in that it consists of the following steps: a) placing a hermetic circuit 1 in a processing cell (10); b) connecting the hermetic circuit 1, in a processing cell 10, to the respective connection means (80), connected to a vacuum pump (12) and to a fluid supply source (70); c) providing a selective and consecutive fluid communication of the connection means (80) with the vacuum pump (12) and with a respective fluid supply source (70), to direct the vacuum production in said hermetic circuit ( 1 ); and d) directing, in the processing cell (10) where the hermetic circuit (1) is located, the supply of a fluid load to said hermetic circuit (1), after a certain vacuum condition has been obtained in this latest.

17. The method according to claim 16, further characterized in that, before step "a" consists of: identifying the type of hermetic circuit (1) supplied to the receiving position and which will be conducted to a processing cell ( 10), identify a vacant processing cell (10); placing the hermetic circuit (1) in the processing cell (10) identified as vacant; and coupling at least one nozzle of the hermetic circuit (1) to the connecting means (80), which is they can selectively connect to the vacuum pump (12) and to a respective fluid supply source (70) of the vacant processing cell (10).

18. The method according to claim 17, further characterized in that it additionally consists of the following steps: directing a vacant processing cell (10) to receive a certain hermetic circuit (1); directing the opening of a first and third valve elements (82, 87) of the connection means (80), to subject the hermetic circuit (1) to a certain vacuum condition; directing the closing of the first valve element (82), after a desired vacuum condition has been obtained; direct the communication of the fluid between the hermetic circuit (1) and the respective fluid supply source (70) during a time interval sufficient to transfer to said hermetic circuit (1) a determined amount of fluid previously established by the type of circuit which is being processed; directing the interruption of fluid communication between the hermetic circuit (1) and the respective fluid supply source (70) and the closing of the fourth valve element (87); close the nozzle of the hermetic circuit (1); and directing the removal of the hermetic circuit (1) from the processing cell (10).

19. The method according to claim 18, further characterized in that it includes the following intermediate steps: direct, consecutively, the opening of a second valve element (84) of the connection means (80) to subject the hermetic circuit ( 1) to a certain condition of fluid supply; e direct the interruption of the communication of fluids between the hermetic circuit (1) and the respective fluid supply source (70), upon closing the second valve element (82) after the fourth valve element (87) has been closed.

20. The method according to claim 19, further characterized in that it consists of the following additional steps: direct the transport means (50) to conduct a hermetic circuit (1) from a receiving position to a positioning position in a respective processing cell (10); e directing the means of transportation (50) to remove the hermetic circuit (1) from the processing cell (10), after the supply of fluid to said hermetic circuit (1) has ended.

21. The method according to claim 20, further characterized in that it consists of the following steps: subjecting the hermetic circuit (1) to a certain condition of vacuum, by means of a predetermined time interval previously established; measuring the vacuum produced, at a time interval at a minimum equal quantity to that of the vacuum production end; direct the execution of one of the processing operations with the production of vacuum and make a new vacuum measurement and reject the hermetic circuit (1) when, respectively, the hermetic circuit (1) has a pressure at a maximum equal to and greater than a previously determined reference pressure; measure the pressure in the hermetic circuit (1), after the new vacuum measurement, determining, if the pressure is higher than a certain known pressure value previously, the rejection of an hermetic circuit (1); subjecting the hermetic circuit (1) to a certain condition to receive a certain amount of fluid, to one of the conditions of a sufficient time interval to achieve a certain vacuum condition and to achieve said determined condition of vacuum.

22. The method according to claim 21, wherein the hermetic circuit (1) is a refrigeration circuit constituted by a compressor, further characterized in that it selectively interrupts fluid communication between the vacuum pump (12) and one side of the low pressure of the hermetic circuit when directing the opening of the second valve element 84, allowing the communication of fluids between the respective supply source (70) and a high pressure side of the hermetic circuit (1).

23. The method according to claim 22, further characterized in that it includes the following steps: direct the opening of a first valve element (89), when the first, second, third and fourth valve elements (82,84) , 87 and 88) are closed, to allow selective communication of fluids between the connection means (80) and a refrigerant fluid recovery circuit.