Patent Application
20060248929
In the field of the dry cleaning machines, the cleaning system of the fabric articles introduced into the cilinder provides, actually, the complete immersion of the fabric articles into the solvent. The fabric articles introduced into the cilinder are completely soaked with solvent on the base of defined quantities, i.e. from three to five litres for each kilograms of fabric articles to be cleaned. The mechanical action actuates to the cilinder rotation permits the complete impregnation of the solvent into the fabric articles to be cleaned by the shaking and the falling down of the fabric articles into the rotating cilinder. In working an average capacity dry cleaning machine needs tanks for be solvent to be used with a capacity of about two hundred litres, so making these machines cumbersome and heavy and with the necessity of rooms with particular characteristics for their localization.
Moreover, before the drying step, is necessary to execute the centrifuge to take away the bigger solvent quantity possible to the fabric articles. For some solvents, in particular the hydrocarbon ones that are currently used for their eco-compatibility characteristics, it is necessary to work with rotation velocity very high owing to the low vapour pressure of these solvents. The solvent introduced into the cilinder and the fabric articles so form a no-homogeneous mass of high weight that is subjected, during the centrifuge, to high angular velocities. This creates the vibrations. The known dry cleaning machines are consequently anchored to the floor and/or equipped with apparatuses to contrast are eliminate said vibrations. On the base of aforesaid, the centrifuge to elimination the solvent from the fabric articles creates economical costs owing to the necessary absorber devices, to the electrical consumption to start the electrical motor connected to the cilinder and a particular choice of the rooms where the dry cleaning machines are placed. An other aspect is connected to the disposal of the big quantity of the used solvents. The solvent used in the cleaning must be depurated into a distiller, by means of the solvent boiling and the subsequent condensation obtained in suitable exchangers inside which flow the cooling water. For the distillation are so necessary, on the base of the used solvent, on an average three or four water litres for each solvent litre. For a machine of average loading the quantity of distilled solvent in one hour, corresponding to two pre-washings, is of about eighty litres.
So for the distillation of said solvent there is an average use in a work day of about two cubic meters of water. The produced distillation waste must be disposed on the base of particular rules regulated to the laws of the different states such as they are dangerous waste. This step so determines high disposal costs, essentially caused to the used quantity of solvent for the complete immersion of the fabric articles inside the cilinder. The present invention has the aim to mainly reduce said disadvantages making minimum the solvent use, avoiding the centrifuge to eliminate the solvent from the fabric articles and substantially reducing the water use, the disposals and the energetic use. This and other aims of the present invention will be better understood from the following description and claims together with the enclosed drawings of sheet 1, 2 and 3 in which a preferred embodiment of this invention is shown. In sheet 1
Then, it is to be considered that in the known dry cleaning machine the solvent loaded of residuals and of dirtiness is piped in the distillation apparatuses where, by means of boiling, evaporation, condensation and recovery presses is separated and depurated from the residuals and from the dirtiness in its inside.
Said residuals in form of sludge with average of solvent in their inside, being dangerous waste, determine high costs of disposal. The invented machine instead acts the removal of the dirty in four different phases where, in the fist phase, it is provided the air intake through the article fabrics still not treat with the solvent.
In this way the superficial maro-impurities are removed, such as hairs, down, dust and other parts of this dimension that, through the intake duct, are stored into the button trap 37 and onto the surface of the air filter 36. To follow a second step where the solvent is nebulized onto the article fabrics to treat, by the nozzles 35, with the cilinder 22 in rotation inside the housing 21. The mechanical action actuated to the rotation of the cilinder 22 determines an uniform distribution of the solvent that begins to actuate its cleaning action. The third step consists of the nebulization of the solvent into the article fabrics to be treated inside the cilinder 22 in rotation and the contemporary intake of hot air. In this way the cleaning action of the solvent onto the article fabrics is actuated, strengthened to the mechanical action of the cilinder rotation and contemporary the introduced air provides to the transport out to the cilinder 22 of the solvent drops with the melted dirty through the suction duct 38. Part of this dirty solvent is kept in the filtering systems present inside the said duct and the remaining part is piped toward an evaporation coil 27 where Freon in expansion flows at a temperature to 0° C. till −5° C. The solvent drops are condensing and they are recovered into the separator 10 then coming to the tank 41. The fourth step is the drying phase. Also in this step the removing of dirt from the article fabrics goes on such as are present the same conditions of the third step with only the exclusion of the solvent nebulization. Going on with the article fabrics warning up, by means of hot air, the solvent contained in them evaporated and it is transported to the circulating air through the apparatuses that actuate the complete condensation and the collecting. The dirty solvent, that during the previous phases was collected onto the bottom of the suction duct, is sucked by the pump 4 and it is put in circulation through the solvent-filter before to arrive to the tank 41. The machine is placed onto a containment tank 45 that, other to support the different components, has also the aim to avoid solvent dispersions on the floor in case of losses or anomalies. The barrel 21 is fixed to a frame and it contains the cylinder 22 to which are connected the apparatuses for its rotation. To said barrel 21 are connected the suction duct 38 and the drying duct 30 fixed by means of sealed flanges. Inside the suction duct are present the button trap 37 and the air filter 36 for keeping the impurities and the threads loss to the article fabrics. The drying duct 30 has, in its inside, other to a second safety air filter, an evaporation coil 27, having the aim of condensation and recovery of the solvent and a Freon condensation coil 25 where compressed Freon flows with a temperature of 70°-80° C. having the aim to give the heat for the drying, collecting also the heat otherwise loss to the refrigerating apparatus 29. An impeller 26 linked to an electric engine determines the air circulation inside the sealed circuit tank-button trap-air circuit. The refrigerator apparatus 29 consists of a compressor, a capacitor and the necessary components for the Freon circulation inside the exchangers to which is connected. The dry cleaning machine has the front door 32 equipped with a patented air conveyor for the drying, said air coming to the upper forced air inlet 42. Onto said door 32 are fixed the spray nozzles 35 connected to the solvent circuit. Moreover, the machine have a tank 41 of about twenty litres of capacity, a separator 10 to separated the water eventfully present in the recuperated during the drying phase, a paper-activated carbon cartridge filter 12 for the circulated solvent depuration and a pump 4 for the circulation of the solvent during the cleaning phases. The plant includes also fittings such as a loading manual valve 3, a manual discharge-valve 5, a manual valve 6 for filter discharge, a valve 8 for separator emptying, a stop valve 9 for the filter inlet, a stop manual valve 11 for the filter outlet, an air valve 13 for the filter exhaust, a valve 34 for air-balance and a check valve 40. Moreover other addition components are provided for the machine working such as a filter pressure gauge 14, a regulator 16 of the air for the nozzless cleaning, a manometer 17, a filter 19 for the nozzles, a drying air thermostatic switch 23, a sight-glass 31 for solvent passing and a drying air thermostatic switch 33 present onto the outlet of the barrel 21. All the working steps are driven by a P.L.C. that controls the different steps and their duration. In working, the invented dry cleaning machine, after to have put the fabric articles into the cilinder and to have closed the door, is started by the operator for the cleaning cycle. The cleaning program starts with a short time of primer of the pump 4, by opening of he valves 2 and 7, with rotation starting of the cilinder 22 and the starting of the refrigerator apparatus 29 and of the impeller 26. The solvent sucked from the tank, circulated though the filter 12 and it returns to the tank whereas the air begins to circulate between the drying duct 30, the air inlet 24, the barrel 21 and the suction duct 38. The following step provides the only air circulation and the cilinder rotation, whereas the valves 2 and 7 are closed and the pump stops. In this step a pre-heating of the cilinder and of the fabric articles is provided before the cleaning phase. At the end of this step the refrigerator apparatus and the impeller are stopped and the cleaning phases of the fabric articles begin. With the cilinder in rotation the valves 2, 18 and 20 are opened and the pump 4 is started. The solvent is sucked from the tank 41 and, through the filter 12, is sent to the spray nozzles 35. In this step, named as “static nebulization”, a first solvent quantity is nebulized onto the fabric articles without a forced air flow. Then there is a short step in where only the rotation of the cilinder is actuated with disarming of the valves and of the pump to create a mechanical action of removal of the dirty to the fabric articles. The cleaning cycle goes on with the “dynamic nebulization” where the solvent is nebulized with a forced air flow and where the valves 2, 18 and 20 are opened and the refrigerator apparat 29 and the impeller 26 are started. The solvent is sucked from the tank 41 and, through the filter 12, comes to the spray nozzles 35 that give out nebulized drops 43 and 44 whereas the air circulating through the inlet 24 transports the nebulization in uniform way into the fabric articles in rotation. The air action into the cilinder is helped by the upper inlet placed in the inside part of the door 32. Following the solvent is discharged from the barrel: with the cilinder in rotation and started the refrigerator apparatus and the ventilation, the valves 2, 18 and 20 are closed and the valves 1 and 7 are opened. The solvent is sucked from the suction duct 38 and through the filter 12 is put again into the tank 41.
Before the drying step the cleaning of the spray nozzles and of their pipes is actuated by opening the valve 15 that inlets compressed air into the injection duct.
This avoids that the residual solvent drops stain the fabric articles during the drying step. In said step, of variable duration defined to the automatic device 39 of drying control, heating air is put in circulation though the fabric articles and the solvent in them contained is condensed in the evaporation coil 27 and recovered into the separator 10 where the water, eventually present, is separated to the solvent that is sent to the tank 41. During the drying step intermediate discharge of the solvent eventually present on the bottom of the tank are actuated. At the drying end the cooling is actuated where air in circulation through the fabric articles in rotation, with the exchanger 24 not in function but with the exchanger 25 in working. In this way, the not heating air, passing through the cooling exchanger is more cooled and the eventual residual solvent is recuperated. The cleaning cycle is so stopped. The enclosed drawings will be better understood from the following list of components:
1=barrel suction valve
2=tank suction valve
3=loading manual valve
4=pump
5=manual discharge valve
6=manual valve for filter discharge
7=return tank valve
8=valve for separator emptying
9=manual stop valve for filter inlet
10=separator
11=stop manual valve for the filter outlet
12=paper-activated carbon cartridge filter
13=air valve for the filter exhaust
14=filter pressure gauge
15=valve for nozzles cleaning
16=regulator of the air for the nozzles cleaning
17=manometer
18=barrel inlet valve
19=filter for the nozzles
20=valve inlet nozzles
21=barrel
22=cilinder
23=drying air thermostatic switch
24=air inlet
25=Freon condensation coil
26=impeller
27=Freon evaporation coil
28=safety air filter
29=refrigerator apparatus
30=drying duct
31=sight-glass
32=front door
33=drying air thermostatic switch
34=valve for the air-balance
35=nozzles
36=air filter
37=button trap
38=suction duct
39=automatic device of drying control
40=check valve
41=tank
42=forced air inlet duct
43=solvent nebulized drops
44=solvent nebulized drops
45=containment tank
| Number | Date | Country | Kind |
|---|---|---|---|
| BO2005A 000323 | May 2005 | IT | national |
