JP2019000803A - Vacuum distillation recovery system for cleaning solvent - Google Patents

Abstract

To provide a simple and inexpensive device which can perform distillation regeneration of a used solvent under a reduce pressure.SOLUTION: A device comprises: a work tank 30 which stores a cleaning solvent 34 therein, and performs liquid cleaning, and/or steam cleaning, and/or steam regeneration under a normal pressure; a heating mechanism 35 which heats the cleaning solvent 34 in the work tank 30; a tightly sealed container 40 which is inserted and located in the work tank 30, and of which a pressure of an interior, which stores used cleaning solvent 34, can be reduced by bringing the cleaning solvent 34 heated by the heating mechanism 35 in the work tank 30 and/or steam of the cleaning solvent 34 generated by this heating into contact therewith; a condensation mechanism 47 which is connected to the tightly sealed container 40 on an outer side of the work tank 30, and condenses steam evaporated from the used cleaning solvent 34 by pressure reduction in the tightly sealed container 40; and a recovery mechanism 52 which recovers the cleaning solvent 34 condensed by the condensation mechanism 47.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cleaning solvent vacuum distillation recovery device for recovering a cleaning solvent used when cleaning an object to be cleaned such as a machine part, an electronic part, or a medical device.

  Conventionally, when solvent cleaning is performed on an object to be cleaned, oil or the like adhering to the object to be cleaned dissolves and mixes with the cleaning solvent, so that oil or the like is mixed in to reuse the cleaning solvent. In general, the used cleaning solvent is recovered by distillation regeneration, and the cleaning cost is reduced by reusing the recovered cleaning solvent.

Japanese Patent Laid-Open No. 9-57003 JP 2001-347237 A

  However, when cleaning with a cleaning solvent and performing distillation regeneration of a used cleaning solvent, as shown in Patent Documents 1 and 2, an apparatus provided with a separate cleaning tank and distillation regeneration mechanism must be used. It was a must. For this reason, the existing cleaning tank and steam generation tank cannot be used, and it is necessary to use another apparatus, which increases the cost. Further, conventionally, distillation under atmospheric pressure is common, and as shown in Patent Document 1, when distillation is performed under reduced pressure, although the recovery efficiency of the solvent is high, the cost for the apparatus is high. It was.

  Accordingly, the present invention is intended to solve the above-described problems, and is intended to make it possible to distill and recycle a used solvent recovered by solvent cleaning of an object to be cleaned under reduced pressure using a simple and inexpensive apparatus. Is.

  In order to solve the above-mentioned problems, the present invention contains a working tank in which a cleaning solvent is housed to perform liquid cleaning and / or steam cleaning and / or distillation regeneration under normal pressure, and a cleaning solvent in the working tank. It is used by contacting the cleaning solvent heated by the above heating mechanism and / or the cleaning solvent launched by this heating in the working tank, and the heating mechanism that heats the heating tank. A sealed container capable of depressurizing the inside containing the used cleaning solvent, and the cleaning solvent evaporated from the used cleaning solvent by reducing the pressure in the sealed container and connected to the sealed container outside the work tank. A condensing mechanism for condensing the vapor, and a recovery mechanism that is connected to the condensing mechanism and collects the cleaning solvent condensed by the condensing mechanism.

  The sealed container may be fixedly provided in the work tank, or may be provided detachably in the work tank.

  Further, the cleaning solvent in the sealed container may have the same composition as the cleaning solvent stored in the work tank, or may have a composition different from that of the cleaning solvent stored in the work tank. For example, as an example of a case where the cleaning solvent in the sealed container and the cleaning solvent in the work tank have different compositions, trichlorethylene is used as the cleaning solvent in the work tank, and a thinner which is a flammable solvent is used in the sealed container. Can also be used. As described above, flammable solvents such as I.P.A can be used as the cleaning solvent in the sealed container, so that the types of cleaning solvents that can be used are widened.

  Since the present invention is constructed as described above, the used cleaning solvent can be recovered by distillation by depressurizing the sealed container containing the used cleaning solvent in the work tank and storing it inside. It is what. Therefore, by using an existing cleaning tank or steam generation tank of a size that allows the sealed container of the present invention to be inserted and arranged, the sealed container is inserted and arranged in a work tank such as this cleaning tank or steam generation tank. The device of the present invention can be obtained. In addition, about this insertion arrangement | positioning, what was provided in the work tank fixedly may be sufficient, and what was provided detachably may be sufficient.

  Therefore, it is not necessary to prepare a new working tank or heating mechanism, and when the cleaning solvent is stored in the existing working tank, the cleaning solvent is used as it is for heating the sealed container during distillation regeneration. be able to. Moreover, since it is not necessary to depressurize a space having a large capacity such as a work tank and only the inside of the sealed container needs to be depressurized, the running cost can be kept low. In addition, by reducing the pressure in the sealed container, it becomes possible to lower the boiling point than in the case of normal pressure and improve the efficiency of distillation recovery, so that the cost required for the cleaning solvent can be reduced. It becomes possible. As described above, by using the apparatus of the present invention, the cleaning operation and the distillation regeneration can be easily and efficiently performed at low cost. In addition, by collecting the used cleaning solvent, which was previously treated as waste liquid, by distillation, it is possible to prevent the generation of CO2 that was generated when the waste liquid was incinerated. It becomes.

The conceptual diagram of Example 1 which shows this invention. 1 is a conceptual diagram illustrating a cleaning tank of Example 1. FIG. The conceptual diagram which shows the washing tank of Example 2 of this invention. The conceptual diagram of Example 2. FIG.

  Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, (1) is a work tank, and the work tank (1) of this embodiment has been conventionally cleaned. It is generally used for the steam cleaning and the distillation regeneration of the cleaning solvent (4). The work tank (1) has a cooling coil (3) on the inner periphery of the opening (2) side, and the cooling coil (3) can condense the cleaning steam in the work tank (1). It is said. The working tank (1) contains a cleaning solvent (4), and a heating mechanism (5) capable of heating the cleaning solvent (4) is provided on the bottom side. In addition, a moisture separator (6) for separating moisture from the cleaning vapor condensed by the cooling coil (3) is connected to the working tank (1), and a float switch (7) and a temperature sensor are connected to the bottom side. (8) is provided. The water separator (6) is connected to a second recovery tank (28) for recovering the cleaning solvent separated by the water separator (6).

  Further, as shown in FIG. 1, a sealed container (10) is detachably inserted into the work tank (1) configured as described above. The hermetic container (10) has a main body (11) and a lid (12) that are in close contact with each other so that the inside can be sealed and decompressed. The lid (12) of the hermetic container (10) is connected to one end (15) of the steam flow passage (14) branched from the connection pipe (13) connected to the lid (12). The other end (16) of the steam flow passage (14) is connected to the condensing mechanism (17). In the present embodiment, as described above, the sealed container (10) is detachably inserted into the work tank (1), but in other different embodiments, the present invention is not limited thereto, and the sealed container (10) is disposed. It may be fixedly arranged in the work tank (1).

  A storage tank (20) is connected to the condensing mechanism (17) via an ejector (18), and a first recovery tank (21) is further connected to the storage tank (20). In this embodiment, the ejector (18), the storage tank (20), the first recovery tank (21), and the following pump (24) are used as the recovery mechanism (22) of the present invention. A cooling pipe (27) is provided in the inner periphery of the bottom of the storage tank (20) for maintaining the liquid stored therein in a cooled state. The storage tank (20) is provided with a circulation path in which one end (15) and the other end (16) are connected to the storage tank (20) via the ejector (18). 24) is provided. In addition, a funnel (26) is provided at the tip of the connection pipe (13) connected to the lid (12) for allowing the used cleaning solvent (4) to flow into the inside through an on-off valve (25).

  Next, a method for recovering the cleaning solvent (4) using the apparatus configured as described above will be described below. First, the cleaning solvent (4) is stored in the work tank (1), and the open / close valve (25) between the sealed container (10) and the funnel (26) is opened, and the used funnel (26) has been used. The cleaning solvent (4) flows into the sealed container (10). Then, after closing the on-off valve (25) and sealing the inside of the sealed container (10), the ejector (18) connected to the condensing mechanism (17) and the circuit pump (24) are operated. By this, the sealed container (10) is brought into a reduced pressure state. Next, the cleaning solvent (4) in the work tank (1) is heated by the heating mechanism (5) to generate the vapor of the cleaning solvent (4) in the work tank (1), thereby Since the vapor of the cleaning solvent (4) that has risen in the contact with the sealed container (10), the sealed container (10) is heated.

  When the sealed container (10) is heated, the used cleaning solvent (4) boils in the sealed container (10) under reduced pressure, and steam is generated. At this time, the generated steam is transferred to the condensing mechanism (17) through the connection pipe (13) and the steam flow passage (14) connected to the lid (12) by the action of the ejector (18) and the pump (24). . The vapor of the cleaning solvent (4) condenses and liquefies in this condensation mechanism (17), and the liquefied cleaning solvent (4) is stored in the storage tank (20) from the condensation mechanism (17) through the ejector (18). Then, it is cooled by a cooling pipe (27) provided in the storage tank (20). The cleaning solvent (4) in the storage tank (20) is recovered in the first recovery tank (21) by overflow and used for the next cleaning.

  As described above, a sealed container (10) formed separately from the work tank (1) in the work tank (1) generally used for liquid cleaning, steam cleaning and distillation regeneration conventionally. The used cleaning solvent (4) can be recovered by distillation and recovered by a simple device that is inserted and arranged. Therefore, there is no need to prepare a special work tank (1) and existing ones can be used, so it is possible to perform distillation regeneration of the cleaning solvent (4) easily under reduced pressure at low cost. It becomes. Also, when such an existing work tank (1) contains a cleaning solvent (4) for use in liquid cleaning, steam cleaning, etc., this cleaning solvent (4) is stored in the sealed container (10). Can be used for heating. Further, the cooling coil (3) generally provided in the work tank (1) can also be used as it is in the distillation regeneration. Therefore, the cost can be further reduced.

  In addition, since the distillation of the used cleaning solvent (4) is performed in a reduced-pressure sealed container (10), the boiling point of the cleaning solvent (4) is lower than that at normal pressure. The efficiency of distillation recovery can be improved. Therefore, the used cleaning solvent (4) can be efficiently recovered by distillation and used for the next cleaning. Therefore, the cleaning cost can be reduced.

  The working tank (1) of the first embodiment is a single tank type, but the working tank (30) of the second embodiment has two tanks on the bottom side of the working tank (30) as shown in FIGS. It is separated. In the working tank (30) of the present embodiment, one of the two tanks separated on the bottom side is a liquid cleaning tank (31) and the other is a steam cleaning tank (32).

  In addition, a cooling coil (57) is provided on the inner periphery of the working tank (30) on the opening (33) side, and the cooling coil (57) enables the cleaning steam in the working tank (30) to be condensed. Yes. A cleaning solvent (34) is stored in the liquid cleaning tank (31) and the steam cleaning tank (32) of the work tank (30). The steam cleaning tank (32) is provided with a heating mechanism (35), a temperature sensor (36), and a float switch (37) on the bottom side. Further, a moisture separator (38) is connected to the steam cleaning tank (32) side in the same manner as in the first embodiment.

  As shown in FIG. 4, a sealed container (40) is inserted and disposed in the steam cleaning tank (32) of the work tank (30) configured as described above. The hermetic container (40) has a main body (41) and a lid (42) that are in close contact with each other so that the inside can be hermetically sealed and decompressed. The sealed container (40) is capable of decompressing the inside, and the lid (42) provided on the sealed container (40) is connected to the connecting pipe (43) connected to the lid (42). One end (45) of the branched steam flow passage (44) is connected, and the other end (46) of the steam flow passage (44) is connected to the condensing mechanism (47). A storage tank (50) and a recovery tank (51) are connected to the condensing mechanism (47) via an ejector (48).

  In this embodiment, the ejector (48), the storage tank (50), the recovery tank (51), and the pump (54) are used as the recovery mechanism (52) of the present invention. The storage tank (50) is provided with a circulation path (53) in which one end (45) and the other end (46) are connected to the storage tank (50) via the ejector (48). 53) is provided with a pump (54). In addition, a funnel (56) is provided at the tip of the connection pipe (43) connected to the lid (42) for allowing the used cleaning solvent (34) to flow into the inside through the on-off valve (55).

  In this example and the above Example 1, the sealed container (40) is heated by bringing the vapor of the cleaning solvent (34) into contact with the sealed container (40). However, the airtight container (40) can be heated by immersing the airtight container (40) in the cleaning solvent (34) heated by the heating mechanism (35).

  Next, a method of recovering the cleaning solvent (34) using the apparatus configured as described above will be described below. First, the cleaning solvent (34) is stored in the steam cleaning tank (32) of the working tank (30), and the open / close valve (55) between the sealed container (40) and the funnel (56) is opened, The used cleaning solvent (34) flows into the sealed container (40) from (56). Then, after closing the on-off valve (55) to seal the inside of the sealed container (40), the ejector (48) connected to the condensing mechanism (47) and the pump (54) of the circulation path (53) are connected. The airtight container (40) is brought into a reduced pressure state by operating. Next, the cleaning solvent (34) in the work tank (30) is heated by the heating mechanism (35) to generate a vapor of the cleaning solvent (34) in the work tank (30). Since the vapor of the cleaning solvent (34) that has risen in the contact with the sealed container (40), the sealed container (40) is heated.

  When the sealed container (40) is heated, the used cleaning solvent (34) boils in the sealed container (40) under reduced pressure, and steam is generated. At this time, the generated steam is transferred to the condensing mechanism (47) through the connection pipe (43) and the steam flow passage (44) connected to the lid (42) by the action of the ejector (48) and the pump (54). . The vapor of the cleaning solvent (34) condenses and liquefies in this condensation mechanism (47), and the liquefied cleaning solvent (34) is stored in the storage tank (50) from the condensation mechanism (47) through the ejector (48). Then, it is cooled by a cooling pipe (58) provided in the storage tank (50). The cleaning solvent (34) in the storage tank (50) is recovered in the recovery tank (51) by overflow and used for the next cleaning.

  As described above, a sealed container (40) formed separately from the work tank (30) in the work tank (30) generally used for liquid cleaning, steam cleaning and distillation regeneration conventionally. The used cleaning solvent (34) can be recovered by distillation and recovered by a simple device that is inserted and arranged. Therefore, it is not necessary to prepare a special work tank (30) or cleaning solvent (34), and the existing one can be used, so that the cleaning solvent (34) can be easily distilled under reduced pressure at a low cost. Playback can be performed.

  In addition, since the distillation of the used cleaning solvent (34) is performed in a reduced-pressure sealed container (40), the boiling point of the cleaning solvent (34) is lower than that at normal pressure. The efficiency of distillation recovery can be improved. Therefore, the used cleaning solvent (34) can be efficiently recovered by distillation and used for the next cleaning. Therefore, the cleaning cost can be reduced.

1,30 Work tank 4,34 Cleaning solvent 5,35 Heating mechanism 10,40 Airtight container 17,47 Condensing mechanism 22,52 Recovery mechanism

  The present invention relates to a cleaning solvent vacuum distillation recovery device for recovering a cleaning solvent used when cleaning an object to be cleaned such as a machine part, an electronic part, or a medical device.

  Conventionally, when solvent cleaning of an object to be cleaned is performed, oil or the like adhering to the object to be cleaned dissolves and mixes with the cleaning solvent. Therefore, in order to reuse this cleaning solvent, oil or the like is mixed. In general, the used cleaning solvent is recovered by distillation regeneration, and the cleaning cost is reduced by reusing the recovered cleaning solvent.

Japanese Patent Laid-Open No. 9-57003 JP 2001-347237 A

  However, when cleaning with a cleaning solvent and performing distillation regeneration of a used cleaning solvent, as shown in Patent Documents 1 and 2, an apparatus provided with a separate cleaning tank and distillation regeneration mechanism must be used. It was a must. For this reason, the existing cleaning tank and steam generation tank cannot be used, and it is necessary to use another apparatus, which increases the cost. Further, conventionally, distillation under atmospheric pressure is common, and as shown in Patent Document 1, when distillation is performed under reduced pressure, although the recovery efficiency of the solvent is high, the cost for the apparatus is high. It was.

  Accordingly, the present invention is intended to solve the above-described problems, and is intended to make it possible to distill and recycle a used solvent recovered by solvent cleaning of an object to be cleaned under reduced pressure using a simple and inexpensive apparatus. Is.

The first invention of the order application which solves the such problem described above, a work tank for performing liquid cleaning housing the cleaning solvent inside, and / or steam cleaning, and / or a distillation regeneration under atmospheric pressure, the working tank a heating mechanism for heating the cleaning solvent of the inner, and freely inserted placed removably in the working chamber, this in the work tank of cleaning solvent launched by washing solvent and / or the heating and heated at the heating mechanism the sealed together with heating the by Ri cleaning solvent already used housed in inside contacting the vapor, and a dense closed container to the interior and allow vacuum to be connected to the closed container at the outside of the work tank e Bei and condensation mechanism by vacuum in the container to condense the vapor of the cleaning solvent evaporated from the used wash solvent, and a recovery mechanism for recovering the cleaning solvent condensed by the condensing device while connected to the condensing device, Sealing capacity above Cleaning solvent of the inner is obtained by a composition different from the cleaning solvent housed in the working chamber.

  For example, as an example of a case where the cleaning solvent in the sealed container and the cleaning solvent in the work tank have different compositions, trichlorethylene is used as the cleaning solvent in the work tank, and a thinner which is a flammable solvent is used in the sealed container. Can also be used. As described above, flammable solvents such as I.P.A can be used as the cleaning solvent in the sealed container, so that the types of cleaning solvents that can be used are widened.

The second invention of the present application also includes a working tank in which a cleaning solvent is housed and liquid cleaning and / or steam cleaning and / or distillation regeneration is performed under normal pressure, and heating for heating the cleaning solvent in the working tank. A mechanism and a funnel for allowing the used cleaning solvent to flow into the inside of the working tank and detachably inserted in the working tank, and the cleaning solvent heated by the heating mechanism in the working tank and / or by this heating By bringing the cleaning solvent vapor into contact with the heated cleaning solvent stored inside through the funnel, a sealed container in which the inside can be decompressed, and the sealed container on the outside of the working tank And a condensing mechanism for condensing the cleaning solvent vapor evaporated from the used cleaning solvent due to the reduced pressure in the sealed container, and a condensing mechanism connected to the condensing mechanism and Is obtained by a recovery mechanism for recovering the condensation washed solvent was.

The first of the gun, since the second shot bright is obtained by constituting as described above, by reducing the pressure of the sealed container containing the used wash solvent therein is inserted arranged in the working tank, the used The cleaning solvent can be recovered by distillation. Therefore, a first aspect of the present patent application, by using the second shot Ming sealed container inserted deployable size existing cleaning tank and the steam generator tank and the like, to the cleaning tank and the vapor generating bath like working tank by inserting placing the sealed container, the first of the present patent application, in which it is possible to obtain a second shot Ming device.

Therefore, it is not necessary to prepare a new working tank or heating mechanism, and when the cleaning solvent is stored in the existing working tank, the cleaning solvent is used as it is for heating the sealed container during distillation regeneration. be able to. Moreover, since it is not necessary to depressurize a space having a large capacity such as a work tank and only the inside of the sealed container needs to be depressurized, the running cost can be kept low. In addition, by reducing the pressure in the sealed container, it becomes possible to lower the boiling point than in the case of normal pressure and improve the efficiency of distillation recovery, so that the cost required for the cleaning solvent can be reduced. It becomes possible. Thus, a first aspect of the present Application, by using a second shot Ming device may easily scrubbing and distillation regeneration efficiency can be performed at low cost. In addition, by collecting the used cleaning solvent, which was previously treated as waste liquid, by distillation, it is possible to prevent the generation of CO2 that was generated when the waste liquid was incinerated. It becomes.

The conceptual diagram of Example 1 which shows this invention. 1 is a conceptual diagram illustrating a cleaning tank of Example 1. FIG. The conceptual diagram which shows the washing tank of Example 2 of this invention. The conceptual diagram of Example 2. FIG.

  Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIGS. 1 and 2, (1) is a work tank, and the work tank (1) of this embodiment has been conventionally cleaned. It is generally used for the steam cleaning and the distillation regeneration of the cleaning solvent (4). The work tank (1) has a cooling coil (3) on the inner periphery of the opening (2) side, and the cooling coil (3) can condense the cleaning steam in the work tank (1). It is said. The working tank (1) contains a cleaning solvent (4), and a heating mechanism (5) capable of heating the cleaning solvent (4) is provided on the bottom side. In addition, a moisture separator (6) for separating moisture from the cleaning vapor condensed by the cooling coil (3) is connected to the working tank (1), and a float switch (7) and a temperature sensor are connected to the bottom side. (8) is provided. The water separator (6) is connected to a second recovery tank (28) for recovering the cleaning solvent separated by the water separator (6).

Further, as shown in FIG. 1, a sealed container (10) is detachably inserted into the work tank (1) configured as described above. The hermetic container (10) has a main body (11) and a lid (12) that are in close contact with each other so that the inside can be sealed and decompressed. The lid (12) of the hermetic container (10) is connected to one end (15) of the steam flow passage (14) branched from the connection pipe (13) connected to the lid (12). The other end (16) of the steam flow passage (14) is connected to the condensing mechanism (17) .

  A storage tank (20) is connected to the condensing mechanism (17) via an ejector (18), and a first recovery tank (21) is further connected to the storage tank (20). In this embodiment, the ejector (18), the storage tank (20), the first recovery tank (21), and the following pump (24) are used as the recovery mechanism (22) of the present invention. A cooling pipe (27) is provided in the inner periphery of the bottom of the storage tank (20) for maintaining the liquid stored therein in a cooled state. The storage tank (20) is provided with a circulation path in which one end (15) and the other end (16) are connected to the storage tank (20) via the ejector (18). 24) is provided. In addition, a funnel (26) is provided at the tip of the connection pipe (13) connected to the lid (12) for allowing the used cleaning solvent (4) to flow into the inside through an on-off valve (25).

  Next, a method for recovering the cleaning solvent (4) using the apparatus configured as described above will be described below. First, the cleaning solvent (4) is stored in the work tank (1), and the open / close valve (25) between the sealed container (10) and the funnel (26) is opened, and the used funnel (26) has been used. The cleaning solvent (4) flows into the sealed container (10). Then, after closing the on-off valve (25) and sealing the inside of the sealed container (10), the ejector (18) connected to the condensing mechanism (17) and the circuit pump (24) are operated. By this, the sealed container (10) is brought into a reduced pressure state. Next, the cleaning solvent (4) in the work tank (1) is heated by the heating mechanism (5) to generate the vapor of the cleaning solvent (4) in the work tank (1), thereby Since the vapor of the cleaning solvent (4) that has risen in the contact with the sealed container (10), the sealed container (10) is heated.

  When the sealed container (10) is heated, the used cleaning solvent (4) boils in the sealed container (10) under reduced pressure, and steam is generated. At this time, the generated steam is transferred to the condensing mechanism (17) through the connection pipe (13) and the steam flow passage (14) connected to the lid (12) by the action of the ejector (18) and the pump (24). . The vapor of the cleaning solvent (4) condenses and liquefies in this condensation mechanism (17), and the liquefied cleaning solvent (4) is stored in the storage tank (20) from the condensation mechanism (17) through the ejector (18). Then, it is cooled by a cooling pipe (27) provided in the storage tank (20). The cleaning solvent (4) in the storage tank (20) is recovered in the first recovery tank (21) by overflow and used for the next cleaning.

  As described above, a sealed container (10) formed separately from the work tank (1) in the work tank (1) generally used for liquid cleaning, steam cleaning and distillation regeneration conventionally. The used cleaning solvent (4) can be recovered by distillation and recovered by a simple device that is inserted and arranged. Therefore, there is no need to prepare a special work tank (1) and existing ones can be used, so it is possible to perform distillation regeneration of the cleaning solvent (4) easily under reduced pressure at low cost. It becomes. Also, when such an existing work tank (1) contains a cleaning solvent (4) for use in liquid cleaning, steam cleaning, etc., this cleaning solvent (4) is stored in the sealed container (10). Can be used for heating. Further, the cooling coil (3) generally provided in the work tank (1) can also be used as it is in the distillation regeneration. Therefore, the cost can be further reduced.

  In addition, since the distillation of the used cleaning solvent (4) is performed in a reduced-pressure sealed container (10), the boiling point of the cleaning solvent (4) is lower than that at normal pressure. The efficiency of distillation recovery can be improved. Therefore, the used cleaning solvent (4) can be efficiently recovered by distillation and used for the next cleaning. Therefore, the cleaning cost can be reduced.

  The working tank (1) of the first embodiment is a single tank type, but the working tank (30) of the second embodiment has two tanks on the bottom side of the working tank (30) as shown in FIGS. It is separated. In the working tank (30) of the present embodiment, one of the two tanks separated on the bottom side is a liquid cleaning tank (31) and the other is a steam cleaning tank (32).

  In addition, a cooling coil (57) is provided on the inner periphery of the working tank (30) on the opening (33) side, and the cooling coil (57) enables the cleaning steam in the working tank (30) to be condensed. Yes. A cleaning solvent (34) is stored in the liquid cleaning tank (31) and the steam cleaning tank (32) of the work tank (30). The steam cleaning tank (32) is provided with a heating mechanism (35), a temperature sensor (36), and a float switch (37) on the bottom side. Further, a moisture separator (38) is connected to the steam cleaning tank (32) side in the same manner as in the first embodiment.

  As shown in FIG. 4, a sealed container (40) is inserted and disposed in the steam cleaning tank (32) of the work tank (30) configured as described above. The hermetic container (40) has a main body (41) and a lid (42) that are in close contact with each other so that the inside can be hermetically sealed and decompressed. The sealed container (40) is capable of decompressing the inside, and the lid (42) provided on the sealed container (40) is connected to the connecting pipe (43) connected to the lid (42). One end (45) of the branched steam flow passage (44) is connected, and the other end (46) of the steam flow passage (44) is connected to the condensing mechanism (47). A storage tank (50) and a recovery tank (51) are connected to the condensing mechanism (47) via an ejector (48).

  In this embodiment, the ejector (48), the storage tank (50), the recovery tank (51), and the pump (54) are used as the recovery mechanism (52) of the present invention. The storage tank (50) is provided with a circulation path (53) in which one end (45) and the other end (46) are connected to the storage tank (50) via the ejector (48). 53) is provided with a pump (54). In addition, a funnel (56) is provided at the tip of the connection pipe (43) connected to the lid (42) for allowing the used cleaning solvent (34) to flow into the inside through the on-off valve (55).

  In this example and the above Example 1, the sealed container (40) is heated by bringing the vapor of the cleaning solvent (34) into contact with the sealed container (40). However, the airtight container (40) can be heated by immersing the airtight container (40) in the cleaning solvent (34) heated by the heating mechanism (35).

  Next, a method of recovering the cleaning solvent (34) using the apparatus configured as described above will be described below. First, the cleaning solvent (34) is stored in the steam cleaning tank (32) of the working tank (30), and the open / close valve (55) between the sealed container (40) and the funnel (56) is opened, The used cleaning solvent (34) flows into the sealed container (40) from (56). Then, after closing the on-off valve (55) to seal the inside of the sealed container (40), the ejector (48) connected to the condensing mechanism (47) and the pump (54) of the circulation path (53) are connected. The airtight container (40) is brought into a reduced pressure state by operating. Next, the cleaning solvent (34) in the work tank (30) is heated by the heating mechanism (35) to generate a vapor of the cleaning solvent (34) in the work tank (30). Since the vapor of the cleaning solvent (34) that has risen in the contact with the sealed container (40), the sealed container (40) is heated.

  When the sealed container (40) is heated, the used cleaning solvent (34) boils in the sealed container (40) under reduced pressure, and steam is generated. At this time, the generated steam is transferred to the condensing mechanism (47) through the connection pipe (43) and the steam flow passage (44) connected to the lid (42) by the action of the ejector (48) and the pump (54). . The vapor of the cleaning solvent (34) condenses and liquefies in this condensation mechanism (47), and the liquefied cleaning solvent (34) is stored in the storage tank (50) from the condensation mechanism (47) through the ejector (48). Then, it is cooled by a cooling pipe (58) provided in the storage tank (50). The cleaning solvent (34) in the storage tank (50) is recovered in the recovery tank (51) by overflow and used for the next cleaning.

  As described above, a sealed container (40) formed separately from the work tank (30) in the work tank (30) generally used for liquid cleaning, steam cleaning and distillation regeneration conventionally. The used cleaning solvent (34) can be recovered by distillation and recovered by a simple device that is inserted and arranged. Therefore, it is not necessary to prepare a special work tank (30) or cleaning solvent (34), and the existing one can be used, so that the cleaning solvent (34) can be easily distilled under reduced pressure at a low cost. Playback can be performed.

  In addition, since the distillation of the used cleaning solvent (34) is performed in a reduced-pressure sealed container (40), the boiling point of the cleaning solvent (34) is lower than that at normal pressure. The efficiency of distillation recovery can be improved. Therefore, the used cleaning solvent (34) can be efficiently recovered by distillation and used for the next cleaning. Therefore, the cleaning cost can be reduced.

1,30 Work tank 4,34 Cleaning solvent 5,35 Heating mechanism 10,40 Airtight container 17,47 Condensing mechanism 22,52 Recovery mechanism

Claims (5)

  A working tank that contains cleaning solvent and liquid cleaning and / or steam cleaning and / or distillation regeneration under normal pressure, a heating mechanism that heats the cleaning solvent in this working tank, and a work tank It is possible to depressurize the inside containing the used cleaning solvent by contacting the cleaning solvent heated by the heating mechanism and / or the cleaning solvent vapor raised by this heating in this working tank. An airtight container, a condensing mechanism connected to the airtight container outside the working tank, and condensing the vapor of the cleaning solvent evaporated from the used cleaning solvent by the reduced pressure in the airtight container, and the condensing mechanism And a recovery mechanism for recovering the cleaning solvent condensed by the condensing mechanism.   2. The apparatus for vacuum distillation recovery of a cleaning solvent according to claim 1, wherein the sealed container is fixedly provided in the work tank.   2. The cleaning solvent vacuum distillation recovery apparatus according to claim 1, wherein the sealed container is detachably provided in the work tank.   The cleaning solvent vacuum distillation recovery apparatus according to claim 1, wherein the cleaning solvent in the sealed container has the same composition as the cleaning solvent stored in the work tank.   2. The cleaning solvent vacuum distillation recovery apparatus according to claim 1, wherein the cleaning solvent in the sealed container has a composition different from that of the cleaning solvent stored in the work tank.