Patent Publication Number: US-2019193123-A1

Title: Cleaning device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation application based on a PCT Patent Application No. PCT/JP2017/028760, filed Aug. 8, 2017, which claims priority on Japanese Patent Application No. 2016-184298, filed Sep. 21, 2016, the contents of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a cleaning device. 
     BACKGROUND 
     Patent Document 1 discloses a vacuum cleaning device, which includes a vapor cleaning chamber for vapor-cleaning of a workpiece (an object to be cleaned) and a dipping chamber for dip-cleaning of the workpiece, performs the vapor-cleaning on the workpiece in the vapor cleaning chamber and then performs the dip-cleaning on the workpiece in the dipping chamber, and performs a drying treatment on the workpiece in the vapor cleaning chamber without using a vacuum pump by forcing a condensing chamber under a reduced pressure to communicate with the vapor cleaning chamber. A cleaning device that adopts the same drying mode as in Patent Document 1 is disclosed in Patent Documents 2 and 3. Further, a vacuum degreasing and cleaning device and a vacuum cleaner that adopt the same cleaning mode as in Patent Document 1 are disclosed in Patent Documents 4 and 5. 
     Patent Document 1: Japanese Patent No. 5695762 
     Patent Document 2: Japanese Unexamined Patent Application, First Publication No. 2016-010776 
     Patent Document 3: Japanese Unexamined Patent Application, First Publication No. 2016-011805 
     Patent Document 4: Japanese Unexamined Patent Application, First Publication No. H06-220672 
     Patent Document 5: Japanese Unexamined Patent Application, First Publication No. 2003-236479 
     SUMMARY 
     Meanwhile, in the drying mode of Patent Documents 1 to 3, the workpiece is dried by forcing the condensing chamber (the drying chamber) under a reduced pressure to communicate with the vapor cleaning chamber (the cleaning chamber), and thus moving grit and dust present in the vapor cleaning chamber (the cleaning chamber) to the condensing chamber (the drying chamber) along with a cleaning solvent vaporized in a vapor cleaning chamber (a cleaning chamber). Since the grit and dust attached to the inside of the condensing chamber (the drying chamber) reduce condensation performance for vapor of the cleaning solvent, they need to be removed. 
     However, in the condensing chamber (the drying chamber) of Patent Documents 1 to 3, since maintainability thereof is not taken into consideration, the grit and dust attached to the inside of the condensing chamber or the drying chamber cannot be easily removed. In the cleaning device that adopts the drying mode using the condensing chamber (the drying chamber) under a reduced pressure, it is extremely important to improve the maintainability of the condensing chamber (the drying chamber) in view of practical use. 
     The present disclosure was made in view of the above circumstances, and it is an object thereof to improve of a condenser the maintainability over the related art. 
     A cleaning device according to an aspect of the present disclosure includes: a main body including a vapor cleaning chamber configured to perform vapor-cleaning on a workpiece and a dipping cleaning chamber configured to perform dip-cleaning on the workpiece; and a condenser provided on the vapor cleaning chamber to be capable of switching between a communication state and a non-communication state with the vapor cleaning chamber via a vapor inlet port, and configured to condense vapor taken in from the vapor inlet port, in which the condenser includes: a condenser casing in which the vapor inlet port is formed; a cooling pipe through which a coolant flows; and a holding member that holds the cooling pipe to detachably house the cooling pipe in the condenser casing. 
     According to the present disclosure, since the cooling pipe is detachably housed in the condenser casing, easy access to the inside of the cooling pipe or the condenser casing is possible by detaching the cooling pipe from the condenser casing, and therefore the maintainability can be improved over the related art. According to the present disclosure, it is possible to easily remove grit and dust attached to the surface of the cooling pipe when, for example, vapor is condensed on the surface of the cooling pipe of the condenser, or grit and dust attached to the inner surface of the condenser casing when the vapor is condensed on the inner surface of the condenser casing of the condenser. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a sectional view of a vacuum cleaning device according to an embodiment of the present disclosure in a leftward/rightward direction. 
         FIG. 2  is a sectional view of the vacuum cleaning device according to the embodiment of the present disclosure in a forward/backward direction. 
         FIG. 3  is an enlarged longitudinal sectional view of a part of the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 4  is a side view of the vacuum cleaning device according to the embodiment of the present disclosure from behind. 
         FIG. 5A  is a top view of a condenser according to an embodiment of the present disclosure. 
         FIG. 5B  is a longitudinal sectional view of the condenser according to the embodiment of the present disclosure. 
         FIG. 6  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 7  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 8  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 9  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 10  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 11  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
         FIG. 12  is a sectional view showing a cleaning process in the vacuum cleaning device according to the embodiment of the present disclosure. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. 
     As shown in  FIGS. 1 and 2 , a vacuum cleaning device according to the present embodiment includes a cleaner (a main body)  1 , a condenser  2 , a vacuum pump  3 , and a vaporiser  4 . The vacuum cleaning device according to the present embodiment includes various devices, for example a regeneration concentrator acting as an auxiliary device, in addition to the cleaner  1 , the condenser  2 , the vacuum pump  3 , and the vaporiser  4 . 
     The cleaner  1  is a device that forces vapor of a cleaning solvent (vaporized cleaning solvent) to act on a workpiece W to which a dirt component is attached, then dips the workpiece W in the cleaning solvent, and thereby cleans the workpiece W. 
     That is, the cleaner  1  continuously receives vaporized cleaning solvent generated by the vaporiser  4  over a predetermined period (a cleaning period), continues to perform attachment of the vaporized cleaning solvent on a surface of the workpiece W housed in a cleaning chamber S 1  and condensation of the vaporized cleaning solvent, and thereby washes away the dirt component attached to the surface of the workpiece W from the surface of the workpiece W along with a condensate of the cleaning solvent. Furthermore, the cleaner  1  dips the workpiece W in a cleaning solvent stored in a dipping chamber S 2 , thereby removing dirt attached to fine portions of the workpiece W, and performs shower cleaning on the workpiece W in the cleaning chamber S 1  again, thereby washing away the dirt. 
     The workpiece W is, for example, a metal part, to a surface of which cutting oil or the like as a dirt component is attached in machining. The cleaning solvent is a hydrocarbon-based cleaning solvent, for example, a normal paraffin-based, isoparaffin-based, naphthene-based, or aromatic hydrocarbon-based cleaning solvent. More specifically, the cleaning solvent is a class  3  petroleum cleaning solvent such as TeClean (registered trademark) N20, Clean Sol G, or Dapheny Solvent, which are called cleaning solvents. 
     As shown in the drawings, the cleaner  1  includes a cleaner casing  1   a  in which the cleaning chamber (the vapor cleaning chamber) S 1  and the dipping chamber (the dipping cleaning chamber) S 2  are formed. The cleaner casing  1   a  is formed in a hollow cuboid shape (approximately a box shape) as a whole, and an internal space thereof is vertically divided into the cleaning chamber S 1  and the dipping chamber S 2  by a middle door  1   g  (to be described below). A workpiece insertion port  1   b  is provided in a front surface of the cleaner casing  1   a . The workpiece insertion port  1   b  is an opening extending in a vertical direction and used for taking in and out the workpiece W between the cleaner casing  1   a  (i.e., the cleaner  1 ) and an exterior, and is closed or opened by a vertically movable front door  1   c . The vacuum pump  3  is connected to the cleaner casing  1   a  via a control valve, and it is possible to set an atmosphere of the cleaning chamber S 1  to a vacuum atmosphere (a decompressed atmosphere) of a predetermined pressure. 
     As shown in  FIG. 2 , a communication port  1   d  for forcing the cleaning chamber S 1  that is an internal space of the cleaner  1  to communicate with a condensing chamber G that is an internal space of the condenser  2  is formed in a lateral surface (a rear surface or a right lateral surface in  FIG. 2 ) of the cleaner casing  1   a  on which the condenser  2  is mounted. As shown in  FIG. 3 , the communication port  1   d  is a circular opening that is formed in a part of the cleaner casing  1   a . A surface of the cleaner casing  1   a  around the communication port  1   d , which comes into contact with a valve body  2   i  (to be described below), constitutes a valve seat  1   f . The valve seat  1   f  will be described below in detail. 
     Furthermore, the cleaner  1  includes the middle door  1   g , an elevating mechanism  1   h , a vapor introduction damper  1   i , shower nozzles  1   j , and a dipping chamber heater  1   k . The middle door  1   g  is a plate member that divides the cleaner casing  1   a  into the cleaning chamber S 1  and the dipping chamber S 2  in an upward/downward direction. When the middle door  1   g  is closed, the cleaning chamber S 1  becomes a sealed space separated from the dipping chamber. The elevating mechanism  1   h  is a mechanism that raises/lowers the workpiece W between the cleaning chamber S 1  and the dipping chamber S 2  inside the cleaner casing  1   a.    
     The vapor introduction damper  1   i  is connected to a cleaning solvent storage tank  4   a  (to be described below) of the vaporiser  4 , and is also connected to the cleaning chamber S 1 . The vapor introduction damper  1   i  is a mechanism that can regulate a degree of opening of a flow passage of the vaporized cleaning solvent that flows from the vaporiser  4  toward the cleaning chamber S 1  to adjust a flow rate of the vaporized cleaning solvent introduced into the cleaning chamber S 1 . The shower nozzles  1   j  are provided above the cleaning chamber S 1  and discharge the cleaning solvent supplied from the cleaning solvent storage tank  4   a  into the cleaning chamber S 1 . The shower nozzles  1   j  are connected to the cleaning solvent storage tank  4   a  of the vaporiser  4  by a pipeline (not shown), and the pipeline is opened/closed by a valve. The dipping chamber heater  1   k  is buried in a lower sidewall of the cleaner casing  1   a  and heats the cleaning solvent in the dipping chamber S 2 . 
     A bubbling pipe (not shown) is provided below the dipping chamber S 2  in the cleaner casing  1   a . Air (outside air) flows into the bubbling pipe, and is discharged from a discharge port provided in the dipping chamber S 2 . A bubbling valve (not shown) is provided on a discharge port of the bubbling pipe. 
     The condenser  2  is a device that has an approximately columnar shape as shown in the drawings, and takes in the vapor in the cleaning chamber S 1  through the communication port  1   d  to condense (liquefy) the vapor. In a state in which cleaning of the workpiece W is terminated in the cleaner  1 , the cleaning solvent is attached to a surface of the workpiece W and an inner surface of the cleaner casing  1   a.    
     Although the details will be described below, the condenser  2  vaporizes the cleaning solvent that remains in the cleaning chamber S 1  (especially the cleaning solvent attached to the surface of the workpiece W) after the cleaning of the workpiece W into vapor (residual vapor), and moves the residual vapor from the cleaning chamber S 1  to the condensing chamber to condense (liquefy) the residual vapor. 
     The condenser  2  includes a condenser casing  2   a , two cooling coils (cooling pipes)  2   b  and  2   c , a holding member  2   d , and an opening/closing mechanism  2   e . Among the components of the condenser  2 , the holding member  2   d  includes a lid member  2   f , a plurality of rod members  2   g , and a plurality of locking members  2   h , and the opening/closing mechanism  2   e  includes a valve body  2   i , a connecting rod  2   j , a bearing member  2   k , an air cylinder  2   m , and a guide member  2   n.    
     The condenser casing  2   a  is a hollow columnar member that has an approximately cylindrical shape and is fixed to the cleaner casing  1   a  in a vertical posture. That is, the condenser casing  2   a  is mounted on the cleaner casing  1   a  such that an axis of the condenser casing  2   a  is vertical. An upper end portion of the condenser casing  2   a  is a circular release end  2   p , and a lower end portion of the condenser casing  2   a  includes a circular vapor inlet port (a circular opening)  2   q  which faces the communication port (a circular opening)  1   d  of the cleaner casing  1   a  located on a side (in the front) of the condenser casing  2   a  and whose diameter is slightly larger than that of the communication port  1   d . A drain port is provided in a lower portion of the condenser casing  2   a . A used cleaning solvent (to be described below) is discharged to a storage container provided below the condenser casing  2   a.    
     The two cooling coils  2   b  and  2   c  are coil-shaped cooling pipes in which a direction of a winding axis is a direction of the axis (i.e., a vertical direction) of the condenser casing  2   a  and a coolant flows through the cooling coils  2   b  and  2   c . The two cooling coils  2   b  and  2   c  are provided at a predetermined interval in a direction perpendicular to the axis of the condenser casing  2   a , that is, in two rows adjacent to each other in a horizontal direction. That is, the cooling coil  2   b  of the two cooling coils  2   b  and  2   c  is provided at a position close to the axial center of the condenser casing  2   a , and the cooling coil  2   c  is provided at a position further from the axial center of the condenser casing  2   a  than the cooling coil  2   b . The coolant may be any liquid as long as it can be held in the condensing chamber at a temperature below a boiling point of the cleaning solvent under a reduced pressure. 
     The holding member  2   d  holds the two cooling coils  2   b  and  2   c , and detachably houses the two cooling coils  2   b  and  2   c  in the condenser casing  2   a . That is, the holding member  2   d  includes the lid member  2   f  that blocks the release end (an attachment/detachment port)  2   p  formed at the condenser casing  2   a , the plurality of rod members  2   g  one ends (upper ends) of which are fixed to the lid member  2   f , and the plurality of locking members  2   h  that are provided in predetermined places of the rod members  2   g  and lock the two cooling coils  2   b  and  2   c.    
     The lid member  2   f  is a disk-shaped member that constitutes a part of the condenser casing  2   a , and is detachably fixed to the release end  2   p  of the condenser casing  2   a  by a plurality of fasteners made up of, for example, bolts and nuts. The rod members  2   g  are long studs extending in a vertical direction. The upper ends of the rod members  2   g  are screwed into a plurality of bolt holes that are formed in the lid member  2   f  to be apart from each other, and the locking members  2   h  are screwed onto lower ends of the rod members  2   g . The plurality of locking members  2   h  are plates in which bolt holes into which the lower ends of the rod members  2   g  are screwed are formed, protrude to sides of the rod members  2   g  extending in the vertical direction, that is, protrude in a horizontal direction, and are engaged with lower ends of the cooling coils  2   b  and  2   c.    
     Here, ends (four ends in total) of the two cooling coils  2   b  and  2   c  constitute external connection ports T 1  to T 4  that are drawn to an upper side of the lid member  2   f , that is, to an outside of the condenser casing  2   a , via through-holes formed in the lid member  2   f . Among the four external connection ports T 1  to T 4 , the external connection port T 1  is one end of the one cooling coil  2   b , and the external connection port T 2  is the other end of the one cooling coil  2   b . The external connection port T 3  is one end of the other cooling coil  2   c , and the external connection port T 4  is the other end of the other cooling coil  2   c.    
     That is, the condenser  2  according to the present embodiment is configured to be capable of setting a connection relationship between the two cooling coils  2   b  and  2   c  outside the condenser  2 . For example, as shown in  FIG. 5A , in the case where the external connection ports T 2  and T 3  are connected to each other and the coolant is supplied to the external connection port T 1  and is discharged from the external connection port T 4 , the one cooling coil  2   b  and the other cooling coil  2   c  are connected in series, and the coolant flows to a path that passes through the one cooling coil  2   b  and then passes through the other cooling coil  2   c . In this case, since the one cooling coil  2   b  and the other cooling coil  2   c  are connected in series, the passing path of the coolant is simple. 
     Meanwhile, in the case where a branch supply pipe is used to supply the coolant to the external connection ports T 1  and T 3  in parallel and to discharge the coolant from the external connection ports T 2  and T 4 , the one cooling coil  2   b  and the other cooling coil  2   c  are connected in parallel, and the coolant flows to the one cooling coil  2   b  and the other cooling coil  2   c  in parallel. In this case, since the one cooling coil  2   b  and the other cooling coil  2   c  are connected in parallel, pressure loss becomes smaller than in the case shown in  FIG. 5A , and thus the coolant can be made to flow at a relatively low supply pressure. 
     The opening/closing mechanism  2   e  directly closes or opens the communication port  1   d  of the cleaner casing  1   a , and thereby indirectly opens/closes the vapor inlet port  2   q  of the condenser casing  2   a . That is, as shown in  FIG. 3 , the opening/closing mechanism  2   e  includes the valve body (the disk-shaped member)  2   i  that is located in the cleaner casing  1   a  and has a larger diameter than the communication port  1   d . The valve body  2   i  comes into close contact with the valve seat  1   f  or is separated from the valve seat  1   f , and thereby the cleaning chamber S 1  and the condensing chamber G are switched between a non-communication state and a communication state. 
     The connecting rod  2   j  is a rod member, one end (a front end) of which is coupled to the center of the valve body  2   i  in a vertical posture, and the other end (a rear end) of which is coupled to a movable piece of the air cylinder  2   m . The bearing member  2   k  slidably supports the connecting rod  2   j  in a longitudinal direction thereof, and is fixed to the condenser casing  2   a . The air cylinder  2   m  is a driving source for the valve body  2   i , that is, the air cylinder  2   m  is configured to make the valve body  2   i  come in close contact with the valve seat  1   f  or be separated from the valve seat  1   f , and drives the valve body  2   i  by supporting the valve seat  1   f  via the connecting rod  2   j.    
     Here, to reliably close the communication port  1   d  (i.e., the vapor inlet port  2   q ) with the valve body  2   i , an outer circumferential portion of the valve body  2   i  needs to come into contact with the valve seat  1   f  over the entire circumference. Therefore, the center of the valve body  2   i  that is a disk-shaped member and the center of the valve seat  1   f  that is a circular opening need to be aligned. When positions of the center of the valve body  2   i  and the center of the valve seat  1   f  deviate extremely, a part of the outer circumferential portion of the valve body  2   i  is not in contact with the valve seat  1   f , and therefore the valve body  2   i  cannot completely close the communication port  1   d  (i.e., the vapor inlet port  2   q ). 
     The guide member  2   n  is provided to realize this alignment of the valve body  2   i  and the valve seat  1   f . The guide member  2   n  is an approximately disk-shaped member that is press-fitted into a halfway portion of the connecting rod  2   j  in a longitudinal direction, and faces the valve body  2   i  in parallel at a predetermined distance. An outer circumferential portion of the guide member  2   n  is slidably brought into contact with an inner circumferential surface of a portion (a cylindrical portion that is directed forward (i.e., in a leftward/rightward direction in  FIGS. 3 and 5B )) around the vapor inlet port  2   q  in the condenser casing  2   a . Thereby, the center of the connecting rod  2   j  is aligned with the center of the vapor inlet port (the circular opening)  2   q , and the entire circumference of the outer circumferential portion of the valve body  2   i  is brought into contact with the valve seat  1   f.    
     As shown in  FIG. 2 , the vacuum pump  3  is a device that is connected to the cleaning chamber S 1  of the cleaner  1  and the condenser  2  and evacuates gases in the cleaning chamber S 1  and the condenser  2 , and thereby converts pressures of the cleaner  1  and the condenser  2  into negative pressures. A first vacuum valve v 1  is provided on a connection pipe p 1  between the vacuum pump  3  and the cleaner  1 , and a second vacuum valve v 2  is provided on a connection pipe p 2  between the vacuum pump  3  and the condenser  2 . 
     As shown in  FIG. 1 , the vaporiser  4  includes the cleaning solvent storage tank  4   a  and a vapor generating heater  4   b . The cleaning solvent storage tank  4   a  is provided outside the cleaner casing  1   a , and the cleaning solvent discharged from the vapor introduction damper  1   i  and the shower nozzles  1   j  to the cleaning chamber S 1  is stored therein. The cleaning solvent that is recovered by the condenser  2  and is regenerated by a regeneration condenser flows into the cleaning solvent storage tank  4   a . The vapor generating heater  4   b  heats the cleaning solvent stored in the cleaning solvent storage tank  4   a , and is installed inside the cleaning solvent storage tank  4   a . This vaporiser  4  generates the vaporized cleaning solvent used for a vapor-cleaning treatment by heating the cleaning solvent stored in the cleaning solvent storage tank  4   a.    
     Operations of the vacuum cleaning device having the cleaner  1  and the condenser  2  are automatically controlled by a control device (not shown). The vacuum cleaning device is used in a state in which a periphery thereof is covered by an external cladding. 
     Next, the operations of the vacuum cleaning device configured in this way will be described with reference to  FIGS. 6 to 13 . 
     When the workpiece W is cleaned using the vacuum cleaning device, the workpiece W is housed in the cleaning chamber S 1  from the workpiece insertion port  1   b  provided in the cleaner casing  1   a  as shown in  FIG. 6 . A dirt component such as cutting oil is attached to the surface of the workpiece W. The front door  1   c  provided on the cleaner casing  1   a  is driven, and thereby the cleaning chamber S 1  becomes a sealed space. 
     In this state, first, the opening/closing mechanism  2   e  sets the cleaning chamber S 1  and the condensing chamber G in a communication state. In this state, the vacuum pump  3  is operated. Thereby, the cleaning chamber S 1  and the condensing chamber G are gradually decompressed, and are set to, for example, a pressure (an initial pressure) of 10 kPa or lower. 
     In parallel to the decompressing treatment of the cleaning chamber S 1  and the condensing chamber G, the vaporiser  4  is operated, and vaporized cleaning solvent is generated. The vaporized cleaning solvent has a pressure that is a saturated vapor pressure, and a temperature that is around a boiling point of the cleaning solvent under a reduced pressure, for example 80 to 140° C. When the decompressing treatment is completed, the opening/closing mechanism  2   e  is operated. Thereby, the cleaning chamber S 1  and the condensing chamber G are switched from the communication state to a non-communication state, and the cleaning chamber S 1  and the condensing chamber G become individual sealed spaces. A coolant is supplied to the condenser  2  from outside, and thereby a temperature of the condensing chamber G is held at a constant temperature. In the case where water (tap water) is used as the coolant, the temperature of the condensing chamber G is held below a boiling point of the cleaning solvent. 
     After this pretreatment, a vapor-cleaning treatment is performed. The vaporized cleaning solvent is supplied from the vaporiser  4  to the cleaning chamber S 1  via the vapor introduction damper  1   i  over a predetermined cleaning period. Thereby, the workpiece W in the cleaning chamber S 1  is cleaned. That is, attachment and condensation of the vaporized cleaning solvent are continuously repeated on the surface of the workpiece W over the predetermined cleaning period, and the dirt component attached to the surface of the workpiece W is removed (cleaned) by falling down from the surface of the workpiece W along with a condensate of the vaporized cleaning solvent. 
     When this vapor-cleaning treatment of the workpiece W is terminated, the cleaning chamber S 1  has a pressure (a cleaning chamber pressure) that is nearly equal to the saturated vapor pressure of the vaporized cleaning solvent, and a temperature (about 80 to 140° C.) that is nearly equal to the temperature of the vaporized cleaning solvent. That is, the cleaning chamber pressure and the cleaning chamber temperature are values that are considerably higher than preset held pressure and temperature of the condensing chamber G (a condensing chamber pressure and a condensing chamber temperature). 
     A drying treatment of the workpiece W in the cleaning chamber S 1  is followed by the vapor-cleaning treatment. In this drying treatment, the opening/closing mechanism  2   e  is operated, and thereby the cleaning chamber S 1  and the condensing chamber G that have the above-described pressure relationship and temperature relationship communicate with each other. That is, the air cylinder  2   m  is operated to separate the valve body  2   i  from the valve seat  1   f , and thereby the cleaning chamber S 1  and the condensing chamber G is changed from the non-communication state to the communication state. 
     As a result, the pressure (the cleaning chamber pressure) of the cleaning chamber S 1  is rapidly decompressed, and the condensate (the residual liquid) of the vaporized cleaning solvent attached to the surface of the workpiece W is instantly boiled (suddenly boiled) due to the rapid decompression. The cleaning chamber S 1  and the condensing chamber G are connected in a short time and by a relatively wide area. Thereby, vapor (residual vapor) of the residual liquid separated from the surface of the workpiece W moves, at a high speed, from the cleaning chamber S 1  (a high pressure side) to the condensing chamber G (a low pressure side) via a gap between the valve body  2   i  and the valve seat  1   f , the communication port  1   d , and the vapor inlet port  2   q.    
     The residual vapor moving to the condensing chamber G (the low pressure side) is attached to surfaces of the two cooling coils  2   b  and  2   c , and thereby is recondensed into a used cleaning solvent. The used cleaning solvent is dropped downward from the surfaces of the two cooling coils  2   b  and  2   c , and is slightly collected at the lower portion of the condenser casing  2   a , and is discharged into the storage container from the drain port provided at the lower portion. 
     When the drying treatment is completed, a dip-cleaning treatment is performed. First, when the cleaning solvent is discharged, the valve body  2   i  of the condenser  2  comes into contact with the valve seat  1   f , and the cleaning chamber S 1  and the condensing chamber G are put in the non-communication state. After the cleaning chamber S 1  is returned to the initial pressure, the middle door  1   g  is opened, and the cleaning chamber S 1  and the dipping chamber S 2  are put in the communication state. A cleaning solvent is supplied to the dipping chamber S 2 , and as the elevating mechanism  1   h  is lowered, the workpiece W from which the cleaning solvent is removed is dipped in the cleaning solvent of the dipping chamber S 2  as shown in  FIG. 7 . The cleaning solvent supplied to the dipping chamber S 2  is heated by the dipping chamber heater  1   k . The bubbling valve is opened, and a gas is discharged into the cleaning solvent from the bubbling pipe as shown in  FIG. 8 . Thereby, bubbles are generated in the cleaning solvent. The cleaning solvent flows into fine portions of the workpiece W in this dipping chamber S 2 , and furthermore the bubbles are attached to the surface of the workpiece W. Thereby, a dirt that cannot be removed in the vapor-cleaning treatment is removed. At the same time as the dip-cleaning treatment, in the condenser  2 , the inside of the condensing chamber G is decompressed by the vacuum pump  3  and cooled, and thereby is returned to a state of the condensing chamber G prior to the drying treatment. 
     Furthermore, as shown in  FIG. 9 , when the elevating mechanism  1   h  is raised again to return the workpiece W to the cleaning chamber S 1 , the middle door  1   g  is closed, and thereby the cleaning chamber S 1  is sealed. The valve body  2   i  of the condenser  2  is separated from the valve seat  1   f  again, and thereby the cleaning chamber S 1  and the condensing chamber G are put in the communication state, and a drying treatment is performed. When the drying treatment is completed, the valve body  2   i  of the condenser  2  comes into contact with the valve seat  1   f , and the cleaning chamber S 1  and the condensing chamber G are put in the non-communication state. As shown in  FIG. 10 , a shower cleaning treatment is performed on the workpiece W after the drying treatment. In the shower cleaning treatment, the cleaning solvent stored in the cleaning solvent storage tank  4   a  is discharged from the shower nozzles  1   j  to the cleaning chamber S 1 , and thereby the dirt of the surface of the workpiece W is washed out. At the same time as the shower cleaning treatment, in the condenser  2 , the inside of the condensing chamber G is decompressed by the vacuum pump  3  and cooled, and thereby is returned to the state of the condensing chamber G prior to the drying treatment. 
     When the shower cleaning treatment is completed, the valve body  2   i  of the condenser  2  is separated from the valve seat  1   f  again as shown in  FIG. 11 , and thereby the cleaning chamber S 1  and the condensing chamber G are put in the communication state, and a drying treatment is performed (in this case, as indicated by an arrow in the figure, residual vapor separated from the surface of the workpiece W moves from the cleaning chamber S 1  to the condensing chamber G (the low pressure side) via the gap between the valve body  2   i  and the valve seat  1   f , the communication port  1   d , and the vapor inlet port  2   q ). When the drying treatment is terminated, the valve body  2   i  of the condenser  2  comes into contact with the valve seat  1   f , and the cleaning chamber S 1  and the condensing chamber G are put in the non-communication state. Furthermore, an atmospheric opening valve (not shown) is opened, and outside air flows into the cleaning chamber S 1 , and the inside of the cleaning chamber S 1  is returned to an atmospheric pressure condition. As shown in  FIG. 12 , the front door  1   c  is opened, and the workpiece W is carried out as indicated by an arrow in the figure. 
     As the dip-cleaning treatment is performed, even the workpiece W having a shape in which the vaporized cleaning solvent is difficult to reach fine portions, for example the workpiece W at which recesses are formed, can be sufficiently cleaned. As described above, as the drying treatment is performed during the vapor-cleaning treatment, the dip-cleaning treatment, and the shower cleaning treatment, removal performance of the dirt caused by the cleaning treatment can be improved. 
     According to this vacuum cleaning device of the present embodiment, as the cleaning chamber S 1  and the condensing chamber G are switched from the non-communication state to the communication state, the residual liquid attached to the workpiece W in the cleaning chamber S 1  is gasified and removed, and the workpiece W is rapidly dried in a relatively short time. 
     Here, when the residual vapor generated in the cleaning chamber S 1  moves to the condensing chamber G and is recondensed into an used cleaning solvent, the grit and dust remaining in the cleaning chamber S 1  move to the condensing chamber G along with the residual vapor, and are attached to the surfaces of the two cooling coils  2   b  and  2   c  and the inner surface of the condenser casing  2   a . An amount of the attachment of the grit and dust increases depending on an operating time of the vacuum cleaning device. The grit and dust attached to the surfaces of the two cooling coils  2   b  and  2   c  and the inner surface of the condenser casing  2   a  are main causes of reducing a condensing capacity of the condenser  2 , and thus efficiently removing the grit and dust is extremely important matter for operating the vacuum cleaning device. 
     In view of this circumstance, in the condenser  2  according to the present embodiment, since the two cooling coils  2   b  and  2   c  can be detached from the condenser casing  2   a  along with the holding member  2   d , that is, the two cooling coils  2   b  and  2   c  housed in the condenser casing  2   a  are freely attached/detached to/from the condenser casing  2   a , the cooling coils  2   b  and  2   c  are detached from the condenser casing  2   a , and the grit and dust can be efficiently removed. That is, the vacuum cleaning device according to the present embodiment has more excellent maintainability than the conventional vacuum cleaning device. 
     In the condenser  2  according to the present embodiment, since the condenser casing  2   a  has a columnar shape, and the two cooling coils  2   b  and  2   c  are formed in a coil shape in which the direction of the winding axis is the direction of the axis of the condenser casing  2   a , the two cooling coils  2   b  and  2   c  can be attached/detached to/from the condenser casing  2   a  by only moving the cooling coils  2   b  and  2   c  in the direction of the axis of the condenser casing  2   a . That is, the attachment/detachment of the two cooling coils  2   b  and  2   c  to/from the condenser casing  2   a  is extremely easy. 
     In the condenser  2  according to the present embodiment, since the two cooling coils  2   b  and  2   c  are provided at a predetermined interval in a direction perpendicular to the axis of the condenser casing  2   a , that is, in a radial direction of the cylindrical condenser casing  2   a , the residual vapor moved from the cleaning chamber S 1  to the condensing chamber G can be efficiently condensed. 
     In the condenser  2  according to the present embodiment, since the connection between the two cooling coils  2   b  and  2   c  is set outside the condenser  2  (the condenser casing  2   a ), the supplying state of the coolant to the two cooling coils  2   b  and  2   c  can be easily changed. For example, the connection of the two cooling coils  2   b  and  2   c  can be easily switched between the series connection and the parallel connection. For example, a device having a predetermined function, for example a temperature adjusting device for adjusting the temperature of the coolant or a flow rate adjusting device for adjusting the flow rate of the coolant can be easily inserted between the two cooling coils  2   b  and  2   c  connected in series. 
     In the condenser  2  according to the present embodiment, since the two cooling coils  2   b  and  2   c  are held by the holding member  2   d  that includes the lid member  2   f , the rod members  2   g , and the locking members  2   h , the two cooling coils  2   b  and  2   c  can be simultaneously attached/detached to/from the condenser casing  2   a  by the holding member  2   d . Thereby, the attachment/detachment of the two cooling coils  2   b  and  2   c  to/from the condenser casing  2   a  is further easy. 
     In the present embodiment, since the opening/closing mechanism  2   e  is provided on the condenser  2 , a whole constitution of the device can be more simplified than the case where the opening/closing mechanism  2   e  is provided on the cleaner  1 . For example, in the case where the opening/closing mechanism  2   e  is provided on the cleaner  1 , a connection of the air cylinder  2   m  as the driving source to the valve body  2   i  is complicated, and thereby a whole constitution of the vacuum cleaning device is complicated. 
     In the present embodiment, since the cylindrical condenser  2  (the cylindrical condenser casing  2   a ) is provided in a vertical direction, an installation space of the vacuum cleaning device can be reduced. For example, in the case where the condenser  2  (the condenser casing  2   a ) is provided in a horizontal posture, a wider installation space is required. 
     The present disclosure is not limited to the above embodiment, for example the following modifications are considered. 
     (1) In the present embodiment, the shape of the condenser  2  (the condenser casing  2   a ) is the cylindrical shape, but the present disclosure is not limited thereto. For example, the shape of the condenser  2  (the condenser casing  2   a ) may be a box shape. In the present embodiment, the holding member  2   d  is made up of the lid member  2   f , the rod members  2   g , and the locking members  2   h , but the present disclosure is not limited thereto. 
     (2) In the present embodiment, the single condenser  2  is provided on the single cleaner  1 , but the present disclosure is not limited thereto. For example, to improve the drying capacity, for example to further shorten a drying time, a plurality of condenser  2  may be provided on the single cleaner  1 . 
     (3) In the present embodiment, the two cooling coils  2   b  and  2   c  are adopted as the cooling pipes, but the present disclosure is not limited thereto. For example, cooling pipes folded in a staggered shape other than the coil shape may be used. The number of cooling pipes is not limited to two, and may be one or two or more. 
     (4) In the present embodiment, the vacuum cleaning device adopts the constitution of performing the vapor-cleaning treatment, the dip-cleaning treatment, the shower cleaning treatment, and the drying treatment, but the present disclosure is not limited thereto. The cleaning treatment performed in the cleaning chamber S 1  may be only the vapor cleaning or the shower cleaning. 
     In a cleaning device that adopts drying mode using a condenser, the maintainability of the condenser can be improved.