Patent Publication Number: US-10758949-B2

Title: Pneumatic washing and drying machine

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to the field of washing and drying machines, and particularly relates to a pneumatic washing and drying machine. 
     Description of the Related Art 
     A conventional washing and drying machine generally comprises a washing chamber and a liquid reservoir in fluid communication with the washing chamber so as to collect the fluid from the washing chamber, a conventional water pump allowing to send the liquid contained into the liquid reservoir towards the washing chamber. However, the use of such a conventional water pump does not allow to operate at high liquid pressures and temperatures in the washing chamber. 
     US patent application US2010043841 A1 discloses a cleaning device for cleaning a part, in which a cleaning gas is introduced in a reservoir and a cleaning fluid subject to pressure is introduced in said reservoir, so as to pressurize the cleaning gas which is at an initial pressure, the cleaning liquid being brought to the reservoir from a vessel using a pump. However, this cleaning device does not allow to operate at high liquid pressures and temperatures in the washing chamber, and does not allow to wash and blow the part to be washed in a minimum time without using a conventional pump. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention is intended to solve the disadvantages of the prior art by providing a pneumatic washing and drying machine comprising pneumatic means powered with compressed air or compressed gas to bring a liquid from the liquid reservoir to the washing chamber via the compressed air or gas, and then to bring compressed air or gas to the washing chamber, thereby performing a washing and drying cycle in a minimum time, and operating at high liquid pressures and temperatures in the washing chamber. 
     The present invention thus relates to a pneumatic washing and drying machine comprising a washing chamber and a liquid reservoir in fluid communication with the washing chamber so as to collect the fluid from the washing chamber, said washing chamber being provided internally with spray nozzles configured to spray fluid within the washing chamber, the pneumatic washing and drying machine further comprising a compressed air supply, characterized in that the pneumatic washing and drying machine further comprises pneumatic means powered by the compressed air supply to bring the liquid from the liquid reservoir to the spray nozzles via the air from the compressed air supply, and then to bring the air from the compressed air supply to the spray nozzles, so as to perform at least one washing and drying cycle. 
     The spray nozzles can be directed towards at least a part to be washed, arranged within the washing chamber and configured, in a first phase, to spray liquid so as to wash the at least one part to be washed and then, in a second phase, spray air so as to dry the at least one part to be washed. The fluid sprayed by the spray nozzles can thus be water or air. 
     The liquid reservoir is preferably arranged below the washing chamber such that the liquid flows from the washing chamber to the liquid reservoir by gravity. 
     Thus, the pneumatic means allows a recirculation of the fluid contained into the liquid reservoir towards the washing chamber, so as to obtain washing fluid savings, the washing fluid being preferably water mixed with cleaning products such as detergents. 
     The pneumatic means powered by compressed air thus allows to wash the part to be washed using the liquid from the liquid reservoir, and then blow the part to be washed using the compressed air used to push the liquid towards the washing chamber, thereby allowing to perform a washing and drying cycle in a minimum time and operate at high liquid pressures and temperatures in the washing chamber. 
     It can be noted that the liquid reservoir is firstly filled with washing liquid before starting the pneumatic washing and drying machine, the washing liquid being optionally heated in advance using at least one resistor arranged within the liquid reservoir. 
     According to a first embodiment of the invention, the pneumatic means comprise at least one lower carboy arranged at the liquid reservoir, the at least one lower carboy comprising a liquid inlet connected to the liquid reservoir, a liquid outlet connected to the spray nozzles, an air inlet connected to the compressed air supply, and an air outlet connected to the spray nozzles, the pneumatic means further comprising lower carboy valves respectively connected to the inlets et outlets of the at least one lower carboy, and a control system configured to control said lower carboy valves so as to fill the at least one lower carboy with liquid from the liquid reservoir by gravity, inject compressed air into the at least one lower carboy so as to send, to the spray nozzles, the pressurized liquid contained into the at least one lower carboy, and then send the compressed air contained into the at least one lower carboy to the spray nozzles. 
     Thus, during a first filling phase, the lower carboy is filled with liquid from the liquid reservoir by communicating vessels and/or gravity and, during a second sprinkling phase, the liquid contained in the lower carboy is pushed towards the spray nozzles by the compressed air injected into the lower carboy and, during a third depressurization and blowing phase, the compressed air intended to push the liquid is sent towards the spray nozzles, thereby allowing to return the lower carboy at atmospheric pressure and also blow the part to be washed arranged within the washing chamber. 
     This solution thus allows to operate at higher pressures and temperatures compared to a case where a conventional pump is used. 
     Each carboy optionally has at least one liquid level sensor and one fluid pressure sensor. 
     According to a particular feature of the invention, the pneumatic means comprise at least two lower carboys arranged in parallel, the control system being configured to control the lower carboy valves of the at least two lower carboys in parallel such that the at least two lower carboys each successively perform their washing and drying cycle. 
     Thus, this solution allows to multiply the spraying phases without waiting, the filling of the lower carboys being performed in masking times when another lower carboy sends liquid towards the washing chamber in order to spray the part to be washed. 
     According to a particular feature of the invention, the pneumatic washing and drying machine further comprises an additional compressed air supply connected to the spray nozzles via an additional valve controlled by the control system. 
     Thus, this additional compressed air supply directly connected to the spray nozzles allows to perform a final blowing of the at least one part to be washed. 
     According to a second embodiment of the invention, the pneumatic means comprise at least one upper carboy arranged above the washing chamber, the at least one upper carboy comprising a liquid inlet, an air inlet connected to the compressed air supply, and a fluid outlet connected to the spray nozzles, the pneumatic means further comprising upper carboy valves respectively connected to the inlets and the outlet of the at least one upper carboy and a control system, the pneumatic means further comprising a liquid supply device connected to the liquid inlet of the at least one upper carboy and to the liquid reservoir, the control system being configured to control said upper carboy valves so as to fill the at least one upper carboy with liquid from the liquid supply device, inject compressed air into the at least one upper carboy so as to send, to the spray nozzles, the pressurized liquid contained into the at least one upper carboy, and then send the compressed air contained into the at least one upper carboy to the spray nozzles. 
     Thus, during a first filling phase, the upper carboy is filled with liquid from the liquid reservoir via the liquid supply device and, during a second sprinkling phase, the liquid contained into the upper carboy is pushed towards the spray nozzles by the compressed air injected into the upper carboy and, during a third depressurization and blowing phase, the compressed air intended to push the liquid is sent towards the spray nozzles, thereby allowing to return the upper carboy at atmospheric pressure and also to blow the part to be washed arranged within the washing chamber. 
     By using such an upper carboy, it is possible, after its filling, to perform the washing and blowing sequence with a drastically reduced total cycle time, the upper carboy being arranged as close as possible to the spray nozzles. 
     According to a particular feature of the invention, the pneumatic means comprises at least two upper carboys arranged in parallel, the control system being configured to control the upper carboy valves of the at least two upper carboys in parallel such that the at least two upper carboys each successively perform their washing and drying cycle. 
     Thus, this solution allows to do a series of washing cycles one after the other by filling the upper carboys in masking times when another upper carboy sends liquid towards the washing chamber in order to spray the part to be washed. 
     According to a first variant of the second embodiment of the invention, the liquid supply device is a water pump arranged between the liquid reservoir and the liquid inlet of the at least one upper carboy. 
     Thus, the conventional water pump allows to suck the liquid up from the liquid reservoir and push it back towards the at least one upper carboy of the pneumatic washing and drying machine. 
     According to a second variant of the second embodiment of the invention, the liquid supply device comprises at least one additional carboy arranged at the liquid reservoir, the at least one additional carboy comprising a liquid inlet connected to the liquid reservoir, a liquid outlet connected to the liquid inlet of the at least one upper carboy, an air inlet connected to an additional compressed air supply, and an air outlet connected to the air inlet of the at least one upper carboy, the liquid supply device further comprising additional carboy valves respectively connected to the inlets and outlets of the at least one additional carboy, the control system being configured to control said additional carboy valves so as to fill the at least one additional carboy with liquid from the liquid reservoir, inject compressed air into the at least one additional carboy so as to send, to the at least one upper carboy, the pressurized liquid contained into the at least one additional carboy, and then send the compressed air contained into the at least one additional carboy to the at least one upper carboy. 
     Thus, during a first phase, the additional carboy is filled with liquid from the liquid reservoir and, during a second phase, the liquid contained into the additional carboy is pushed towards the upper carboy by the compressed air injected into the additional carboy from the additional compressed air supply and, during a third phase, the compressed air used to push the liquid is sent towards the upper carboy, thereby allowing both to return the additional carboy at atmospheric pressure and blow the part to be washed arranged in the washing chamber simultaneously with the upper carboy blowing phase. 
     This solution thus allows to operate at higher pressures and temperatures compared to a case where a conventional pump is used. 
     According to a particular feature of the invention, a double boiler is arranged around the at least one upper carboy so as to overheat the liquid contained into the at least one upper carboy. 
     According to a particular feature of the invention, a filter is arranged within each carboy. 
     Thus, the filter allows to filtrate the impurities present in the washing liquid. 
     According to a particular feature of the invention, the pneumatic means further comprise, for each carboy, a recirculation and warming circuit configured to send the liquid and then the air from said carboy into the liquid reservoir. 
     Thus, the recirculation and warming circuit allows a recirculation and warming mode of the pneumatic washing and drying machine, in which the liquid and then the compressed air contained into the carboy are sent into the liquid reservoir, the liquid being pushed by the compressed air. 
     According to a particular feature of the invention, the spray nozzles are arranged on at least one stationary or rotating ramp arranged within the washing chamber. 
     Thus, the rotating ramp of spray nozzles allows to sprinkle and blow almost the entire surface of the part to be washed by rotating the rotating ramp around said part to be washed. 
     According to another variant, the ramp is stationary and the part is fixed on a rotating support carrying means allowing to make the part integral with the rotating support, thereby allowing the spray nozzles of the stationary ramp to sprinkle and blow almost the entire surface of the part to be washed by rotating the part to be washed below the stationary ramp. 
     According to another variant, the ramp can rotate and the part is fixed on a rotating support carrying means allowing to make the part integral with the rotating support, the rotating ramp and the rotating support can rotate in the same direction or in opposite directions, at the same speed or different speeds. 
     According to a last variant also contemplated in the scope of the present invention, the ramp is stationary and the part to be washed is stationary. 
     To better illustrate the object of the present invention, preferred embodiments will be described below for illustrative and non-limiting purposes, in reference to the appended drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In these drawings: 
         FIG. 1  is a schematic diagram of a pneumatic washing and drying machine according to a first variant of a first embodiment of the invention; 
         FIG. 2  is a schematic diagram of a pneumatic washing and drying machine according to a second variant of the first embodiment of the invention; 
         FIG. 3  is a schematic diagram of a pneumatic washing and drying machine according to a first variant of a second embodiment of the invention; 
         FIG. 4  is a schematic diagram of a pneumatic washing and drying machine according to a second variant of the second embodiment of the invention; and 
         FIG. 5  is a schematic diagram of a pneumatic washing and drying machine according to a third variant of the second embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     If referring to  FIG. 1 , a pneumatic washing and drying machine  1  according to a first variant of a first embodiment of the invention is shown. 
     The pneumatic washing and drying machine  1  comprises a washing chamber  2  and a liquid reservoir  3  in fluid communication with the washing chamber  2  so as to collect the fluid from the washing chamber  2 , the liquid reservoir  3  being arranged below the washing chamber  2  such that the liquid flows from the washing chamber  2  to the liquid reservoir  3  by gravity via a waste pipe  4 . 
     It can be noted that the liquid reservoir  3  could also be arranged near the washing chamber  2  while being at a height lower than the washing chamber  2 , without departing from the scope of the present invention. 
     The washing chamber  2  comprises an upper portion  2   a  and a lower portion  2   b  on which a part to be washed  5  is arranged, the lower portion  2   b  being connected to the waste pipe, at least one from the upper  2   a  and lower  2   b  portions being movable such that the user can access the interior of the washing chamber  2 . 
     The washing chamber  2  further comprises a housing  2   c  surrounding the upper  2   a  and lower  2   b  portions of the washing chamber  2  and comprising a lateral opening  2   d  such that the user can access the interior of the washing chamber  2 , in particular to introduce therein a part to be washed  5 . 
     The washing chamber  2  further comprises therein a rotating ramp  6  on which spray nozzles  7  are arranged, which are oriented towards the part to be washed  5  and configured to spray liquid so as to wash the part to be washed  5  and then air so as to blow the part to be washed  5  in order to dry the same. 
     The liquid reservoir  3  contains a washing liquid  8  therein, the washing liquid  8  being heated beforehand using at least one resistor (not shown in  FIG. 1 ) disposed within the liquid reservoir  3 . 
     A filter  9  is disposed within the liquid reservoir  3  at the inlet of the waste pipe  4 , so as to filter the potential impurities present in the washing liquid from the washing chamber  2 , thereby allowing to recycle the washing liquid, as described below. 
     The pneumatic washing and drying machine  1  further comprising a compressed air supply  10 . 
     The pneumatic washing and drying machine  1  also comprises pneumatic means  11  powered by the compressed air supply  10  to bring liquid from the liquid reservoir  3  to the spray nozzles  7  via the air from the compressed air supply  10 , and then to bring the air from the compressed air supply  10  to the spray nozzles  7 , so as to perform a washing and drying cycle. 
     The pneumatic means  11  allow a recirculation of the liquid  8  contained into the liquid reservoir  3  towards the washing chamber  2 , the washing liquid  8  preferably being water mixed with cleaning products such as detergents. 
     The pneumatic means  11  thus allow to wash the part to be washed  5  using the liquid  8  from the liquid reservoir  3 , and then blow the part to be washed  5  using the compressed air used to push the liquid  8  towards the liquid  8  towards the washing chamber  2 , thereby allowing to perform a washing and drying cycle in a minimum time and to operate at high liquid pressures and temperatures in the washing chamber. 
     The pneumatic means  11  has a lower carboy  12  arranged in line with the liquid reservoir  3  or below the same. 
     The lower carboy  12  comprises a liquid inlet  12   a  connected to the bottom of the liquid reservoir  3  via a valve YV 1 , a liquid outlet  12   b  connected to the spray nozzles  7  via a valve YV 3  and a rotating joint  13  connected to the rotating ramp  6 , an air inlet  12   c  connected to the compressed air supply  10  via a valve YV 5 , a first air outlet  12   d  connected to the spray nozzles  7  via a valve YV 6  and the rotating joint  13 , and a second air outlet  12   e  connected to the upper portion of the liquid reservoir  3  via a valve YV 2 . 
     The pneumatic means  11  further comprise a control system CS configured to control the valves YV 1 , YV 2 , YV 3 , YV 5 , YV 6  and YV 7  so as to fill the lower carboy  12  with liquid  8  from the liquid reservoir  3  by opening the valves YV 1  and YV 2 , and inject compressed air from the compressed air supply  10  into the lower carboy  12  by opening the valve YV 5  so as to send, to the spray nozzles  7 , the pressurized liquid contained into the lower carboy  12  by opening the valve YV 3 , and then send the compressed air contained into the lower carboy  12  to the spray nozzles  7  by opening the valve YV 6 . 
     Thus, during a first filling phase, the lower carboy is filled with liquid  8  from the liquid reservoir  3  by communicating vessels and, during a second sprinkling phase, the liquid contained into the lower carboy  12  is pushed towards the spray nozzles  7  by the compressed air injected into the lower carboy  12  and, during a third depressurization and blowing phase, the compressed air used to push the liquid is sent towards the spray nozzles  7 , thereby allowing to return the lower carboy  12  to atmospheric pressure and blow the part to be washed  5  arranged within the washing chamber  2 . 
     The lower carboy  12  optionally comprises at least one liquid level sensor and one fluid pressure sensor. 
     The pneumatic washing and drying machine  1  further comprises an additional compressed air supply  14  connected to the spray nozzles  7  via a valve YV 7 , controlled by the control system, and the rotating joint  13 . This additional compressed air supply  14  allows to perform a final blowing of the part to be washed  5  by opening the valve YV 7 , after the third depressurization and blowing phase. 
     The pneumatic means  11  further comprises a valve YV 4  controlled by the control system and arranged between the liquid outlet  12   b  of the lower carboy  12  and the upper portion of the liquid reservoir  3 . The valves YV 2 , YV 4  and YV 5  constitute a recirculation and warming circuit configured to send the liquid contained into the lower carboy  12  by opening the valves YV 4  and YV 5 , and then the air contained into the lower carboy  12  by opening the valve YV 2  within the liquid reservoir  3  so as to perform a recirculation and warming mode of the system, said liquid being pushed by said compressed air. 
     It can be noted that the lower carboy  12  could also comprise a filter therein, without departing from the scope of the present invention. 
     If referring to  FIG. 2 , a pneumatic washing and drying machine  15  according to a second variant of the first embodiment of the invention is shown. 
     The common elements between the first and second variants of the first embodiment of the invention have the same reference numeral, and will not be described in more detail when they have identical structures. 
     The pneumatic means  11  have three lower carboys  12 ,  16 ,  17  arranged in parallel. 
     It can be noted that the pneumatic means  11  could also comprise any number of lower carboys in parallel, without departing from the scope of the present invention. 
     The first lower carboy  12  according to the second variant is identical to that according to the first variant of the first embodiment of the invention, except that a valve YV 11  is arranged between the liquid outlet  12   b  and the valve YV 3  and that a valve YV 21  is arranged between the first air outlet  12   d  and the valve YV 6 . 
     The second lower carboy  16  comprises a liquid inlet  16   a  connected to the bottom of the liquid reservoir  3  via a valve YV 1 B, a liquid outlet  16   b  connected to the valve YV 3  via a valve YV 12 , an air inlet  16   c  connected to the compressed air supply  10  via a valve YV 5 B, a first air outlet  16   d  connected to the valve YV 6  via a valve YV 22 , and a second air outlet  16   e  connected to the upper portion of the liquid reservoir  3  via a valve YV 2 B. 
     The third lower carboy  17  comprises a liquid inlet  17   a  connected to the bottom of the liquid reservoir  3  via a valve YV 1 C, a liquid outlet  17   b  connected to the valve YV 3  via a valve YV 13 , an air inlet  17   c  connected to the compressed air supply  10  via a valve YV 5 C, a first air outlet  17   d  connected to the valve YV 6  via a valve YV 23 , and a second air outlet  17   e  connected to the upper portion of the liquid reservoir  3  via a valve YV 2 C. 
     The valves YV 11 , YV 12 , YV 13 , YV 21 , YV 22 , YV 23 , YV 5 B, YV 5 C, YV 1 B, YV 1 C, YV 2 B and YV 2 C are controlled by the control system (not shown in  FIG. 2 ). 
     The control system is configured to control all the valves, namely YV 11 , YV 12 , YV 13 , YV 21 , YV 22  and YV 23 , of the three lower carboys  12 ,  16  and  17  such that the three lower carboys  12 ,  16  and  17  each successively perform their washing and drying cycle such as described in  FIG. 1 . 
     This second variant thus allows to multiply the sprinkling phases without waiting, the filling of the lower carboys being performed in masking times when another lower carboy sends liquid towards the washing chamber  2  so as to sprinkle the part to be washed  5 . 
     If referring to  FIG. 3 , a pneumatic washing and drying machine  18  according to a first variant of a second embodiment of the invention is shown. 
     The common elements between the first variant of the first embodiment of  FIG. 1  and this first variant of the second embodiment have the same reference numeral, and will not be described in more detail when they have identical structures. 
     The pneumatic washing and drying machine  18  of  FIG. 3  is identical to that of  FIG. 1 , except that the pneumatic means further comprise an upper carboy  19  arranged above the washing chamber  2 . 
     The upper carboy  19  has a liquid inlet  19   a  connected to the valve YV 3 , a first air inlet  19   b  connected to the valve YV 6 , a second air inlet  19   c  connected to the valve YV 7 , a first fluid outlet  19   d  connected to the spray nozzles  7  via a valve YVL 1 , and a second fluid outlet  19   e  connected to the upper portion of the liquid reservoir  3  via a valve YVTP 1 . 
     The control system (not shown in  FIG. 3 ) also controls the valves YVL 1  and YVTP 1 . 
     The lower carboy  12  is used as a device for supplying liquid from the liquid reservoir  3  to the upper carboy  19  using the compressed air from the compressed air supply  10  according to the control of the valves described in  FIG. 1 . 
     Thus, the control system is configured to control the valves so as to fill the upper carboy  19  with liquid from the lower carboy  12 , and then to inject compressed air from the additional compressed air supply  14  into the upper carboy  19  so as to send, to the spray nozzles  7 , the pressurized liquid contained into the upper carboy  19 , and send the compressed air contained into the upper carboy  19  to the spray nozzles  7 . 
     By using such an upper carboy  19  arranged above the washing chamber  2 , the control system can, after filling the upper carboy  19  with liquid, perform a washing and blowing sequence by opening only simultaneously the valves YV 7  and YVL 1 , thereby greatly reducing the total cycle time. 
     The compressed air contained into the lower carboy  12  used to push the liquid towards the upper carboy  19  can be sent towards the upper carboy  19  by opening the valve YV 6 , or be sent towards the liquid reservoir  3  by opening the valve YV 2 . 
     The opening of the valve YVTP 1  by the control system allows to discharge the air from the upper carboy  19  to the liquid reservoir  3 . 
     It can be noted that a double boiler could also be arranged around the upper carboy  19  so as to overheat the liquid contained into the upper carboy  19 , without departing from the scope of the present invention. 
     The upper carboy  19  could also have a filter therein, without departing from the scope of the present invention. 
     If referring to  FIG. 4 , a pneumatic washing and drying machine  20  according to a second variant of the second embodiment of the invention is shown. 
     The common elements between the first variant of the second embodiment of  FIG. 3  and this second variant of the second embodiment have the same reference numeral, and will not be described in more detail when they have identical structures. 
     The pneumatic washing and drying machine  20  of  FIG. 4  is identical to that of  FIG. 3 , except that the pneumatic means  11  have a water pump  21  as a liquid supply device and not a lower carboy supplied with compressed air, the water pump  21  being arranged between the liquid reservoir  3  and the liquid inlet  19   a  of the upper carboy  19  via the valve YV 3 , and except that the upper carboy  19  has only one air inlet  19   c  connected to the valve YV 7 . 
     The water pump  21  is a conventional pump allowing to suck the liquid  8  up from the liquid reservoir  3  and return the same to the upper carboy  19  of the pneumatic washing and drying machine  20 , the water pump  21  being controlled by the control system. 
     The control of the valves YV 3 , YV 7  and YVL 1  by the control system is identical to that of the pneumatic washing and drying machine  18  of  FIG. 3 . 
     When filling the upper carboy  19  via the water pump  21 , the valve YVTP 1  is open so as to act as a vent. 
     The opening of the valves YV 7  and YVL 1  causes the blowing of the liquid then of the air to perform the washing and drying operations in the same action. 
     If referring to  FIG. 5 , a pneumatic washing and drying machine  22  according to a third variant of the second embodiment of the invention is shown. 
     The common elements between the second variant of the second embodiment of  FIG. 4  and this third variant of the second embodiment have the same reference numeral, and will not be described in more detail when they have identical structures. 
     The pneumatic washing and drying machine  22  of  FIG. 5  is identical to that of  FIG. 4 , except that the pneumatic means  11  has three upper carboys  19 ,  23  and  24  arranged in parallel. 
     It can be noted that the pneumatic means  11  could also have any number of upper carboys in parallel, without departing from the scope of the present invention. 
     The first upper carboy  19  comprises a liquid inlet  19   a  connected to the pump  21  via a valve YV 31 , a first fluid outlet  19   d  connected to the rotating joint  13  via a valve YVL 1 , a second fluid outlet  19   e  connected to the liquid reservoir  3  via a valve YVTP 1 , and an air inlet  19   c  connected to the compressed air supply  14  via a valve YV 71 . 
     The second upper carboy  23  comprises a liquid inlet  23   a  connected to the pump  21  via a valve YV 32 , a first fluid outlet  23   d  connected to the rotating joint  13  via a valve YVL 2 , a second fluid outlet  23   e  connected to the liquid reservoir  3  via a valve YVTP 2 , and an air inlet  23   c  connected to the compressed air supply  14  via a valve YV 72 . 
     The third upper carboy  24  comprises a liquid inlet  24   a  connected to the pump  21  via a valve YV 33 , a first fluid outlet  24   d  connected to the rotating joint  13  via a valve YVL 3 , a second fluid outlet  24   e  connected to the liquid reservoir  3  via a valve YVTP 3 , and an air inlet  24   c  connected to the compressed air supply  14  via a valve YV 73 . 
     The valves YV 31 , YV 32 , YV 33 , YV 71 , YV 72 , YV 73 , YVL 1 , YVL 2 , YVL 3 , YVTP 1 , YVTP 2  and YVTP 3  are controlled by the control system (not shown in  FIG. 5 ). 
     The control system is configured to control the valves of the three upper carboys  19 ,  23  and  24  such that the three upper carboys  19 ,  23  and  24  each successively perform their washing and drying cycle such as described in  FIG. 4 . 
     This third variant for direct blowing allows to do a series of washing cycles one after the other by filling the upper carboys in masking times when another upper carboy sends fluid towards the washing chamber  2  so as to sprinkle and dry the part to be washed  5 . 
     The control system can be any electronic circuit, namely a microprocessor, a microcontroller, a digital signal processor, a programmable gate array, an application specific integrated circuit, connected to the different control elements.