JP2023177801A - Decompression cleaning device - Google Patents

Abstract

To improve cleaning efficiency of a cleaned object by preventing accumulation of dirt on a cleaning base.SOLUTION: A decompression cleaning device includes a plate-like cleaning base 7 on which a cleaned object 32 inside decompression tank 1 can be mounted, wherein the cleaning base 7 is vertically slidable inside the decompression tank 1 by a drive mechanism, a circumference 8 of the cleaning base 7 is brought into contact with an inner peripheral surface 33 of the decompression tank 1 and thereby a space in the decompression tank 1 can be airtightly separated into a top face 4 side and a bottom face 3 side, the inside of an isolation chamber 10 formed of the top face 4 side of the decompression tank 1 and the cleaning base 7 can be decompressed by a decompression mechanism 26 connected to the decompression tank 1, and a vibration mechanism 11 for vibrating the cleaning base 7 is provided on a bottom face side of the cleaning base 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vacuum cleaning device for liquid cleaning, steam cleaning, and drying of mechanical parts, electronic components, medical equipment, and other objects to be cleaned using a cleaning solvent in a vacuum tank.

JP, 2015-202463, A In 1995, the production of Freon 113 and 1.1.1-trichloroethane was banned worldwide, and flammable petroleum-based solvents are widely used as alternative solvents. However, petroleum solvents have a high boiling point and are flammable, so in consideration of safety, various vacuum cleaning devices have been developed that enable cleaning in an atmosphere with almost no oxygen.

Among such reduced pressure cleaning devices, as shown in Patent Document 1, a mounting table that is movable up and down is provided in a liquid tank, an object to be cleaned is placed on the mounting table, and a cleaning liquid is stored in the tank. 2. Description of the Related Art There is a known cleaning device that performs liquid cleaning with the cleaning liquid and also performs steam cleaning or reduced pressure drying while moving the object to be cleaned above the cleaning liquid. The vacuum drying of the cleaning device is performed by forming a drying chamber by the above-mentioned mounting table and the top side of the tank, and reducing the pressure inside this drying chamber.

However, since each cleaning is performed with the object to be cleaned always placed on the washing table of Patent Document 1, dirt that falls off from the object to be cleaned is deposited on the washing table. Therefore, when forming a drying chamber, the dirt accumulated on the washing table will reduce the airtightness of the drying chamber, making it difficult to reduce the pressure inside the drying chamber, and the dirt on the washing table will be removed. Since the drying is performed until the end of the drying process, the drying time becomes longer and there arises a problem that the efficiency of vacuum drying decreases.

Therefore, the present application attempts to solve the above-mentioned problems, and aims to improve the cleaning efficiency of objects to be cleaned by preventing the accumulation of dirt on the cleaning table.

In order to solve the above-mentioned problems, the present invention provides a plate-shaped washing table on which objects to be cleaned can be placed in a reduced pressure tank, and the washing table is slid up and down inside the reduced pressure tank by a drive mechanism. By making the periphery of the washing stand in close contact with the inner peripheral surface of the decompression tank, the space inside the decompression tank can be airtightly separated into a top side and a bottom side. The interior of the isolation chamber formed by the side and the washing table can be depressurized by a decompression mechanism connected to the decompression tank, and a vibration mechanism for vibrating the washing table is provided on the bottom side of the washing table. It has been established.

Further, the vibration mechanism may be operable in a cleaning liquid stored in the vacuum tank or in cleaning steam generated in the vacuum tank. By operating the vibrating mechanism during liquid cleaning or steam cleaning in this way, dirt separated from the object to be cleaned on the washing table can be caused to fall downward from the washing table even during liquid cleaning or steam cleaning. It can be removed by

Further, a cleaning liquid is stored in the vacuum tank, and the cleaning liquid can be used to wash the object to be cleaned, and the object to be cleaned, which is placed on the washing table, is placed above the level of the cleaning liquid. In this case, the object to be cleaned may be steam-cleaned, and the object to be cleaned may be placed in the isolation chamber, so that the object to be cleaned can be dried under reduced pressure.

Further, the isolation chamber may be capable of maintaining a heated state at a constant temperature by a heating mechanism provided in the reduced pressure tank, and the bottom side of the reduced pressure tank is provided with a cooling mechanism provided in the reduced pressure tank. It may also be possible to maintain a cooling state at a constant temperature. This makes it possible to always keep the cleaning liquid in a heated state when drying in the isolation chamber, and to keep the cleaning liquid in a cooled state when cleaning the bottom side, so the entire tank is heated each time. There is no need for cleaning or cooling, and it is possible to efficiently perform liquid cleaning and vacuum drying of items to be cleaned in one tank while suppressing loss of thermal energy.

In addition, a steam generation tank for sending cleaning steam to the vacuum tank is provided separately from the vacuum tank, and the top side of the vacuum tank is equipped with a tank that can depressurize the tank and/or the isolation room. It may also be connected to a pressure reducing mechanism.

Further, the cleaning liquid may be a flammable solvent with a boiling point of 100° C. or higher, and the vibration mechanism may be an electric or air vibrator, or an ultrasonic vibrator.

The present invention is configured as described above, and since a vibration mechanism is provided on the bottom side of the cleaning table, by operating the vibration mechanism, cutting waste, press waste, or It becomes possible to remove dirt, such as chips, separated from the object to be cleaned by dropping it from the cleaning table by vibration by the vibration mechanism.

Therefore, when the washing table is slid to form an isolation chamber, dirt is not deposited on the periphery of the washing table, so the periphery and the inner circumferential surface of the decompression tank are kept in close contact with each other. It becomes possible to do so. Therefore, since the degree of sealing in the isolation chamber can be increased, depressurization of the isolation chamber can be performed smoothly. Furthermore, since there is no dirt accumulated in the isolation room other than the items to be cleaned, only vacuum drying of the items to be cleaned is performed, so the drying work can be carried out efficiently in a short time. becomes possible.

FIG. 2 is a conceptual diagram at the time of liquid cleaning in Example 1 showing the present invention. In Example 1, a conceptual diagram at the time of steam cleaning. In Example 1, a conceptual diagram at the time of reduced pressure drying. A conceptual diagram of a conventional example.

Embodiment 1 of the present invention will be explained with reference to FIG. 1. (1) is a depressurizing tank, which is capable of reducing the pressure inside, and has a stepped part (2) in the circumferential direction in the center, and a bottom surface ( The inner diameter of the top surface (4) side is narrower than that of the 3) side. Further, the pressure reduction tank (1) is connected to a pressure reduction pump (6) through a pressure reduction pipe (5).

A flat plate-shaped washing table (7) is provided inside the decompression tank (1). This washing stand (7) can be freely slid up and down between the bottom of the decompression tank (1) and the stepped part (2) by a drive mechanism (not shown). Then, slide the washing table (7) upward and bring the periphery (8) of the washing table (7) into close contact with the inner peripheral surface (33) of the step (2) of the decompression tank (1). By doing so, a sealed isolation chamber (10) can be formed by the top surface (4) side of the decompression tank (1) and the washing table (7).

Furthermore, an electric vibrator is connected to the bottom of the washing table (7) as a vibration mechanism (11) for vibrating the washing table (7). Although an electric vibrator is used in this embodiment, the present invention is not limited to this, and an air vibrator or an ultrasonic vibrator may also be used in other different embodiments. In addition, a heating mechanism (12) is disposed covering the vacuum tank (1) from the stepped portion (2) to the top surface (4), and a heating mechanism (12) is provided on the bottom surface (3) side of the vacuum tank (1). Contains a cleaning solvent (30) for liquid cleaning of the cleaning object (32). Further, a cooling mechanism (not shown) for cooling the cleaning liquid (27) stored in the vacuum tank (1) is provided on the bottom (3) side of the vacuum tank (1). The heating mechanism (12) and the cooling mechanism are capable of maintaining a heating state and a cooling state at a constant temperature, respectively.

Separately from this pressure reducing tank (1), a steam generating tank (13) for cleaning solvent (30) is provided. The bottom side of the steam generation tank (13) can communicate with the bottom side of the pressure reducing tank (1) through a first pipe (14). Note that the first pipe (14) is provided with a first on-off valve (15).

In addition, the top surface (20) of the steam generation tank (13) and the top surface (4) side of the decompression tank (1) are communicated through the second piping (16) and third piping (17) described below. It is possible. That is, the second pipe (16) has one end connected to the decompression tank (1), and the other end connected to the decompression pump (6) through the cooler (18). One end of a third pipe (17) branched from the second pipe (16) is connected to the top surface (20) of the steam generation tank (13).

The second pipe (16) also has a second on-off valve (21) located closer to the pressure reducing tank (1) than the branch point (24) of the third pipe (17), and A third on-off valve (22) is provided closer to the pressure reducing pump (6), and a fourth on-off valve (23) is provided on the third pipe (17). Also, on the bottom side of the steam generation tank (13), there is a device for heating the cleaning solvent (30) stored in the steam generation tank (13) to generate cleaning vapor (31) of the cleaning solvent (30). A heating element (25) is provided. Note that the second pipe (16), the pressure reduction pipe (5), and the pressure reduction pump (6) constitute the pressure reduction mechanism (26) of this embodiment.

Further, as shown in FIG. 1, the decompression tank (1) is provided with a supply pipe (34) for supplying nitrogen gas. The supply pipe (34) branches into a first supply pipe (35) and a second supply pipe (36), and the first supply pipe (35) is connected to the top surface (4) of the decompression tank (1). At the same time, the second supply pipe (36) is connected to the lower part of the step part (2). A fifth on-off valve (37) is provided on the first supply pipe (35), and a sixth on-off valve (38) is provided on the second supply pipe (36). Further, the pressure reducing pipe (5) is provided with a seventh on-off valve (40).

A method of cleaning an object to be cleaned (32) using the vacuum cleaning apparatus configured as described above will be described below. First, the cleaning liquid (27) is stored in the vacuum tank (1). In this example, a hydrocarbon solvent with a boiling point of about 170° C. is used as the cleaning liquid (27). Also, a cleaning solvent (30) that is the same as the cleaning liquid (27) in the decompression tank (1) is stored in the steam generation tank (13), and the heating element (25) of the steam generation tank (13) is heated. By operating, the cleaning solvent (30) in the steam generation tank (13) is heated to generate cleaning steam (31).

Then, the following liquid cleaning is performed. That is, the first on-off valve (15), the second on-off valve (21), the fifth on-off valve (37), and the sixth on-off valve (38) are closed, and the third on-off valve (22) and the fourth on-off valve (22) are closed. Open valve (23). In this state, as shown in FIG. The object to be cleaned (32) is immersed in cleaning by moving it to the 3) side and immersing it in the cleaning liquid (27) cooled by the cooling mechanism of the reduced pressure tank (1) as described above.

In addition, during this immersion cleaning, the third on-off valve (22) and the fourth on-off valve (23) are opened as described above, and the cleaning steam (31) generated in the steam generation tank (13) is transferred to the third on-off valve (22) and the fourth on-off valve (23). Distillation of the cleaning vapor (31) can be carried out by cooling it with a cooler (18) through the pipe (17) and the branch point (24).

By activating the vibration mechanism (11) provided on the washing table (7) and vibrating the washing table (7), the object to be cleaned (32) falls off and lands on the washing table (7). The accumulated dirt can further fall downward from the washing table (7) by the vibration of the vibration mechanism (11).

Next, after the immersion cleaning of the object to be cleaned (32) is completed, the cleaning table (7) is placed above the liquid level (28) of the cleaning liquid (27) as shown in FIG. Then, with the second on-off valve (21), the fourth on-off valve (23), and the seventh on-off valve (40) opened and the third on-off valve (22) closed, the pressure reducing pump (6) is opened. Activate. As a result, the pressure inside the pressure reduction tank (1) is reduced through the pressure reduction pipe (5) and the second pipe (16).

In such a state, the cleaning vapor (31) of the cleaning solvent (30) generated in the steam generation tank (13) flows through the third pipe (17) and the second pipe (16) to the vacuum tank (1). flow inside. As a result, the cleaning steam (31) is stored in the reduced pressure tank (1), and the object to be cleaned (32) is steam-cleaned by the cleaning steam (31). During this steam cleaning, the vibration mechanism (11) of the cleaning table (7) is activated to vibrate the cleaning table (7) in the same way as in the case of immersion cleaning. Since the fallen dirt can be dropped downward from the washing table (7), it is possible to prevent dirt from accumulating on the washing table (7).

At the end of steam cleaning, the fourth on-off valve (23) is closed to stop the supply of cleaning steam (31) from the steam generation tank (13) to the decompression tank (1), and the cleaning table ( 7) further upwards to bring the periphery (8) of the washing table (7) into close contact with the inner circumferential surface (33) of the stepped portion (2) of the decompression tank (1). As a result, a sealed isolation chamber (10) is formed by the top surface (4) of the decompression tank (1) and the cleaning table (7), and as shown in FIG. ) The object to be cleaned (32) is placed in the space.

By forming the isolation chamber (10) as described above, the object to be cleaned (32) can be placed in a narrow, sealed space of the isolation chamber (10). In addition, as mentioned above, during immersion cleaning and/or steam cleaning, the vibration mechanism (11) of the cleaning table (7) is operated to remove dirt accumulated on the cleaning table (7). (7) Almost no dirt remains.

If the object to be cleaned (32) is not very dirty, only the vibration mechanism (11) is used to remove the stain from the washing table (7) during immersion cleaning, and the vibration mechanism (11) is used to remove the stain during steam cleaning. It is not necessary to remove the dirt, but if there is a lot of dirt, it is more effective to remove the dirt from the washing table (7) using the vibration mechanism (11) not only during immersion cleaning but also during steam cleaning. It is.

This makes it possible to more reliably bring the inner peripheral surface (33) of the stepped portion (2) of the decompression tank (1) into close contact with the peripheral edge (8) of the washing table (7). Since the chamber (10) can be made more airtight, no extra energy is required to reduce the pressure in the isolation chamber (10). In addition, by opening the second on-off valve (21) and the third on-off valve (22) and operating the pressure reducing pump (6) with the seventh on-off valve (40) closed, (10) It becomes possible to further increase the degree of reduced pressure. Furthermore, since there is almost no dirt left on the washing stand (7), the dirty parts are not dried, making it possible to dry more quickly and efficiently.

Furthermore, as shown in FIG. 3, since the outer periphery of the isolation chamber (10) is covered with a heating mechanism (12), the isolation chamber (10) can be kept in a heated state at all times. Therefore, even if the cleaning steam (31) comes into contact with the inner wall of the isolation chamber (10), the cleaning steam (31) is unlikely to condense and liquefy on the inner wall.

Therefore, since the condensate of the cleaning steam (31) does not adhere to the inner wall of the isolation chamber (10), only the object to be cleaned (32) in the isolation chamber (10) is to be dried, so the drying time is reduced. It can be made shorter. Further, since the cleaning solvent (30) having a high boiling point is dried in the isolated chamber (10) under reduced pressure as described above, the drying work can be safely performed at a low temperature of around 100°C.

After all the cleaning steps are completed, the reduced pressure state in the reduced pressure tank (1) is released. That is, by first opening the sixth on-off valve (38), nitrogen gas flows into the decompression tank (1) through the sixth on-off valve (38), and the isolation chamber in the decompression tank (1) is The reduced pressure state in spaces other than (10) is released. Thereafter, by opening the fifth on-off valve (37), nitrogen gas flows into the isolation chamber (10) through the fifth on-off valve (37), and the space inside the isolation chamber (10) is The reduced pressure state is released. As a result, the reduced pressure state of the entire reduced pressure tank (1) is released, and all cleaning steps in this embodiment are completed.

1 Decompression tank 3 Bottom surface 4 Top surface 7 Washing table 8 Periphery 10 Isolation chamber 11 Vibration mechanism 12 Heating mechanism 13 Steam generation tank 26 Decompression mechanism 27 Cleaning liquid 28 Liquid surface 31 Cleaning steam 32 Object to be cleaned 33 Inner peripheral surface

The present invention relates to a vacuum cleaning device for liquid cleaning, steam cleaning, and drying of mechanical parts, electronic components, medical equipment, and other objects to be cleaned using a cleaning solvent in a vacuum tank.

JP, 2015-202463, A In 1995, the production of Freon 113 and 1.1.1-trichloroethane was banned worldwide, and flammable petroleum-based solvents are widely used as alternative solvents. However, petroleum solvents have a high boiling point and are flammable, so in consideration of safety, various vacuum cleaning devices have been developed that enable cleaning in an atmosphere with almost no oxygen.

Among such reduced pressure cleaning devices, as shown in Patent Document 1, a mounting table that is movable up and down is provided in a liquid tank, an object to be cleaned is placed on the mounting table, and a cleaning liquid is stored in the tank. 2. Description of the Related Art There is a known cleaning device that performs liquid cleaning with the cleaning liquid and also performs steam cleaning or reduced pressure drying while moving the object to be cleaned above the cleaning liquid. The vacuum drying of the cleaning device is performed by forming a drying chamber by the above-mentioned mounting table and the top side of the tank, and reducing the pressure inside this drying chamber.

However, since each cleaning is performed with the object to be cleaned always placed on the washing table of Patent Document 1, dirt that falls off from the object to be cleaned is deposited on the washing table. Therefore, when forming a drying chamber, the dirt accumulated on the washing table will reduce the airtightness of the drying chamber, making it difficult to reduce the pressure inside the drying chamber, and the dirt on the washing table will be removed. Since the drying is performed until the end of the drying process, the drying time becomes longer and there arises a problem that the efficiency of vacuum drying decreases.

Therefore, the present application attempts to solve the above-mentioned problems, and aims to improve the cleaning efficiency of objects to be cleaned by preventing the accumulation of dirt on the cleaning table.

In order to solve the above-mentioned problems, the present invention provides a plate-shaped washing table on which objects to be cleaned can be placed in a reduced pressure tank, and slides the washing table up and down inside the reduced pressure tank by a drive mechanism. By making the periphery of the washing stand in close contact with the inner peripheral surface of the decompression tank, the space inside the decompression tank can be airtightly separated into a top side and a bottom side. The inside of the isolation chamber formed by the side and the washing table can be depressurized by a pressure reducing mechanism connected to the pressure reducing tank, and the bottom side of the washing table is made to vibrate. A vibration mechanism is provided to remove dirt accumulated on the washing table by dropping it from the washing table .

Further, the vibration mechanism may be operable in a cleaning liquid stored in the vacuum tank or in cleaning steam generated in the vacuum tank. By operating the vibrating mechanism during liquid cleaning or steam cleaning in this way, dirt separated from the object to be cleaned on the washing table can be caused to fall downward from the washing table even during liquid cleaning or steam cleaning. It can be removed by

Further, a cleaning liquid is stored in the vacuum tank, and the cleaning liquid can be used to wash the object to be cleaned, and the object to be cleaned, which is placed on the washing table, is placed above the level of the cleaning liquid. In this case, the object to be cleaned may be steam-cleaned, and the object to be cleaned may be placed in the isolation chamber, so that the object to be cleaned can be dried under reduced pressure.

Further, the isolation chamber may be capable of maintaining a heated state at a constant temperature by a heating mechanism provided in the reduced pressure tank, and the bottom side of the reduced pressure tank is provided with a cooling mechanism provided in the reduced pressure tank. It may also be possible to maintain a cooling state at a constant temperature. This makes it possible to always keep the cleaning liquid in a heated state when drying in the isolation chamber, and to keep the cleaning liquid in a cooled state when cleaning the bottom side, so the entire tank is heated each time. There is no need for cleaning or cooling, and it is possible to efficiently perform liquid cleaning and vacuum drying of items to be cleaned in one tank while suppressing loss of thermal energy.

In addition, a steam generation tank for sending cleaning steam to the vacuum tank is provided separately from the vacuum tank, and the top side of the vacuum tank is equipped with a tank that can depressurize the tank and/or the isolation room. It may also be connected to a pressure reducing mechanism.

Further, the cleaning liquid may be a flammable solvent with a boiling point of 100° C. or higher, and the vibration mechanism may be an electric or air vibrator, or an ultrasonic vibrator.

The present invention is configured as described above, and since a vibration mechanism is provided on the bottom side of the cleaning table, by operating the vibration mechanism, cutting waste, press waste, or It becomes possible to remove dirt, such as chips, separated from the object to be cleaned by dropping it from the cleaning table by vibration by the vibration mechanism.

Therefore, when the washing table is slid to form an isolation chamber, dirt is not deposited on the periphery of the washing table, so the periphery and the inner circumferential surface of the decompression tank are kept in close contact with each other. It becomes possible to do so. Therefore, since the degree of sealing in the isolation chamber can be increased, depressurization of the isolation chamber can be performed smoothly. Furthermore, since there is no dirt accumulated in the isolation room other than the items to be cleaned, only vacuum drying of the items to be cleaned is performed, so the drying work can be carried out efficiently in a short time. becomes possible.

FIG. 2 is a conceptual diagram at the time of liquid cleaning in Example 1 showing the present invention. In Example 1, a conceptual diagram at the time of steam cleaning. In Example 1, a conceptual diagram at the time of reduced pressure drying. A conceptual diagram of a conventional example.

Embodiment 1 of the present invention will be explained with reference to FIG. 1. (1) is a depressurizing tank, which is capable of reducing the pressure inside, and has a stepped part (2) in the circumferential direction in the center, and a bottom surface ( The inner diameter of the top surface (4) side is narrower than that of the 3) side. Further, the pressure reduction tank (1) is connected to a pressure reduction pump (6) through a pressure reduction pipe (5).

A flat plate-shaped washing table (7) is provided inside the decompression tank (1). This washing stand (7) can be freely slid up and down between the bottom of the decompression tank (1) and the stepped part (2) by a drive mechanism (not shown). Then, slide the washing table (7) upward and bring the periphery (8) of the washing table (7) into close contact with the inner peripheral surface (33) of the step (2) of the decompression tank (1). By doing so, a sealed isolation chamber (10) can be formed by the top surface (4) side of the decompression tank (1) and the washing table (7).

Furthermore, an electric vibrator is connected to the bottom of the washing table (7) as a vibration mechanism (11) for vibrating the washing table (7). Although an electric vibrator is used in this embodiment, the present invention is not limited to this, and an air vibrator or an ultrasonic vibrator may also be used in other different embodiments. In addition, a heating mechanism (12) is disposed covering the vacuum tank (1) from the stepped portion (2) to the top surface (4), and a heating mechanism (12) is provided on the bottom surface (3) side of the vacuum tank (1). Contains a cleaning solvent (30) for liquid cleaning of the cleaning object (32). Further, a cooling mechanism (not shown) for cooling the cleaning liquid (27) stored in the vacuum tank (1) is provided on the bottom (3) side of the vacuum tank (1). The heating mechanism (12) and the cooling mechanism are capable of maintaining a heating state and a cooling state at a constant temperature, respectively.

Separately from this pressure reducing tank (1), a steam generating tank (13) for cleaning solvent (30) is provided. The bottom side of the steam generation tank (13) can communicate with the bottom side of the pressure reducing tank (1) through a first pipe (14). Note that the first pipe (14) is provided with a first on-off valve (15).

In addition, the top surface (20) of the steam generation tank (13) and the top surface (4) side of the decompression tank (1) are communicated through the second piping (16) and third piping (17) described below. It is possible. That is, the second pipe (16) has one end connected to the decompression tank (1), and the other end connected to the decompression pump (6) through the cooler (18). One end of a third pipe (17) branched from the second pipe (16) is connected to the top surface (20) of the steam generation tank (13).

The second pipe (16) also has a second on-off valve (21) located closer to the pressure reducing tank (1) than the branch point (24) of the third pipe (17), and A third on-off valve (22) is provided closer to the pressure reducing pump (6), and a fourth on-off valve (23) is provided on the third pipe (17). Also, on the bottom side of the steam generation tank (13), there is a device for heating the cleaning solvent (30) stored in the steam generation tank (13) to generate cleaning vapor (31) of the cleaning solvent (30). A heating element (25) is provided. Note that the second pipe (16), the pressure reduction pipe (5), and the pressure reduction pump (6) constitute the pressure reduction mechanism (26) of this embodiment.

Further, as shown in FIG. 1, the decompression tank (1) is provided with a supply pipe (34) for supplying nitrogen gas. The supply pipe (34) branches into a first supply pipe (35) and a second supply pipe (36), and the first supply pipe (35) is connected to the top surface (4) of the decompression tank (1). At the same time, the second supply pipe (36) is connected to the lower part of the step part (2). A fifth on-off valve (37) is provided on the first supply pipe (35), and a sixth on-off valve (38) is provided on the second supply pipe (36). Further, the pressure reducing pipe (5) is provided with a seventh on-off valve (40).

A method of cleaning an object to be cleaned (32) using the vacuum cleaning apparatus configured as described above will be described below. First, the cleaning liquid (27) is stored in the vacuum tank (1). In this example, a hydrocarbon solvent with a boiling point of about 170° C. is used as the cleaning liquid (27). Also, a cleaning solvent (30) that is the same as the cleaning liquid (27) in the decompression tank (1) is stored in the steam generation tank (13), and the heating element (25) of the steam generation tank (13) is heated. By operating, the cleaning solvent (30) in the steam generation tank (13) is heated to generate cleaning steam (31).

Then, the following liquid cleaning is performed. That is, the first on-off valve (15), the second on-off valve (21), the fifth on-off valve (37), and the sixth on-off valve (38) are closed, and the third on-off valve (22) and the fourth on-off valve (22) are closed. Open valve (23). In this state, as shown in FIG. The object to be cleaned (32) is immersed in cleaning by moving it to the 3) side and immersing it in the cleaning liquid (27) cooled by the cooling mechanism of the reduced pressure tank (1) as described above.

In addition, during this immersion cleaning, the third on-off valve (22) and the fourth on-off valve (23) are opened as described above, and the cleaning steam (31) generated in the steam generation tank (13) is transferred to the third on-off valve (22) and the fourth on-off valve (23). Distillation of the cleaning vapor (31) can be carried out by cooling it with a cooler (18) through the pipe (17) and the branch point (24).

By activating the vibration mechanism (11) provided on the washing table (7) and vibrating the washing table (7), the object to be cleaned (32) falls off and lands on the washing table (7). The accumulated dirt can further fall downward from the washing table (7) by the vibration of the vibration mechanism (11).

Next, after the immersion cleaning of the object to be cleaned (32) is completed, the cleaning table (7) is placed above the liquid level (28) of the cleaning liquid (27) as shown in FIG. Then, with the second on-off valve (21), the fourth on-off valve (23), and the seventh on-off valve (40) opened and the third on-off valve (22) closed, the pressure reducing pump (6) is opened. Activate. As a result, the pressure inside the pressure reduction tank (1) is reduced through the pressure reduction pipe (5) and the second pipe (16).

In such a state, the cleaning vapor (31) of the cleaning solvent (30) generated in the steam generation tank (13) flows through the third pipe (17) and the second pipe (16) to the vacuum tank (1). flow inside. As a result, the cleaning steam (31) is stored in the reduced pressure tank (1), and the object to be cleaned (32) is steam-cleaned by the cleaning steam (31). During this steam cleaning, the vibration mechanism (11) of the cleaning table (7) is activated to vibrate the cleaning table (7) in the same way as in the case of immersion cleaning. Since the fallen dirt can be dropped downward from the washing table (7), it is possible to prevent dirt from accumulating on the washing table (7).

At the end of steam cleaning, the fourth on-off valve (23) is closed to stop the supply of cleaning steam (31) from the steam generation tank (13) to the decompression tank (1), and the cleaning table ( 7) further upwards to bring the periphery (8) of the washing table (7) into close contact with the inner circumferential surface (33) of the stepped portion (2) of the decompression tank (1). As a result, a sealed isolation chamber (10) is formed by the top surface (4) of the decompression tank (1) and the cleaning table (7), and as shown in FIG. ) The object to be cleaned (32) is placed in the space.

By forming the isolation chamber (10) as described above, the object to be cleaned (32) can be placed in a narrow, sealed space of the isolation chamber (10). In addition, as mentioned above, during immersion cleaning and/or steam cleaning, the vibration mechanism (11) of the cleaning table (7) is operated to remove dirt accumulated on the cleaning table (7). (7) Almost no dirt remains.

If the object to be cleaned (32) is not very dirty, only the vibration mechanism (11) is used to remove the stain from the washing table (7) during immersion cleaning, and the vibration mechanism (11) is used to remove the stain during steam cleaning. It is not necessary to remove the dirt, but if there is a lot of dirt, it is more effective to remove the dirt from the washing table (7) using the vibration mechanism (11) not only during immersion cleaning but also during steam cleaning. It is.

This makes it possible to more reliably bring the inner peripheral surface (33) of the stepped portion (2) of the decompression tank (1) into close contact with the peripheral edge (8) of the washing table (7). Since the chamber (10) can be made more airtight, no extra energy is required to reduce the pressure in the isolation chamber (10). In addition, by opening the second on-off valve (21) and the third on-off valve (22) and operating the pressure reducing pump (6) with the seventh on-off valve (40) closed, (10) It becomes possible to further increase the degree of reduced pressure. Furthermore, since there is almost no dirt left on the washing stand (7), the dirty parts are not dried, making it possible to dry more quickly and efficiently.

Furthermore, as shown in FIG. 3, since the outer periphery of the isolation chamber (10) is covered with a heating mechanism (12), the isolation chamber (10) can be kept in a heated state at all times. Therefore, even if the cleaning steam (31) comes into contact with the inner wall of the isolation chamber (10), the cleaning steam (31) is unlikely to condense and liquefy on the inner wall.

Therefore, since the condensate of the cleaning steam (31) does not adhere to the inner wall of the isolation chamber (10), only the object to be cleaned (32) in the isolation chamber (10) is to be dried, so the drying time is reduced. It can be made shorter. Further, since the cleaning solvent (30) having a high boiling point is dried in the isolated chamber (10) under reduced pressure as described above, the drying work can be safely performed at a low temperature of around 100°C.

After all the cleaning steps are completed, the reduced pressure state in the reduced pressure tank (1) is released. That is, by first opening the sixth on-off valve (38), nitrogen gas flows into the decompression tank (1) through the sixth on-off valve (38), and the isolation chamber in the decompression tank (1) is The reduced pressure state in spaces other than (10) is released. Thereafter, by opening the fifth on-off valve (37), nitrogen gas flows into the isolation chamber (10) through the fifth on-off valve (37), and the space inside the isolation chamber (10) is The reduced pressure state is released. As a result, the reduced pressure state of the entire reduced pressure tank (1) is released, and all cleaning steps in this embodiment are completed.

1 Decompression tank 3 Bottom surface 4 Top surface 7 Washing table 8 Periphery 10 Isolation chamber 11 Vibration mechanism 12 Heating mechanism 13 Steam generation tank 26 Decompression mechanism 27 Cleaning liquid 28 Liquid surface 31 Cleaning steam 32 Object to be cleaned 33 Inner peripheral surface

The present invention relates to a vacuum cleaning device for liquid cleaning, steam cleaning, and drying of mechanical parts, electronic components, medical equipment, and other objects to be cleaned using a cleaning solvent in a vacuum tank.

JP, 2015-202463, A In 1995, the production of Freon 113 and 1.1.1-trichloroethane was banned worldwide, and flammable petroleum-based solvents are widely used as alternative solvents. However, petroleum solvents have a high boiling point and are flammable, so in consideration of safety, various vacuum cleaning devices have been developed that enable cleaning in an atmosphere with almost no oxygen.

Among such reduced pressure cleaning devices, as shown in Patent Document 1, a mounting table that is movable up and down is provided in a liquid tank, an object to be cleaned is placed on the mounting table, and a cleaning liquid is stored in the tank. 2. Description of the Related Art There is a known cleaning device that performs liquid cleaning with the cleaning liquid and also performs steam cleaning or reduced pressure drying while moving the object to be cleaned above the cleaning liquid. The vacuum drying of the cleaning device is performed by forming a drying chamber by the above-mentioned mounting table and the top side of the tank, and reducing the pressure inside this drying chamber.

However, since each cleaning is performed with the object to be cleaned always placed on the washing table of Patent Document 1, dirt that falls off from the object to be cleaned is deposited on the washing table. Therefore, when forming a drying chamber, the dirt accumulated on the washing table will reduce the airtightness of the drying chamber, making it difficult to reduce the pressure inside the drying chamber, and the dirt on the washing table will be removed. Since the drying is performed until the end of the drying process, the drying time becomes longer and there arises a problem that the efficiency of vacuum drying decreases.

Therefore, the present application attempts to solve the above-mentioned problems, and aims to improve the cleaning efficiency of objects to be cleaned by preventing the accumulation of dirt on the cleaning table.

In order to solve the above-mentioned problems, the present invention provides a flat plate -shaped washing stand on which objects to be cleaned can be placed in a reduced pressure tank, and the washing stand is slid up and down inside the reduced pressure tank by a drive mechanism. By making the periphery of the washing stand in close contact with the inner peripheral surface of the decompression tank, the space inside the decompression tank can be airtightly separated into a top side and a bottom side. The inside of the isolation chamber formed by the side and the washing table can be depressurized by a pressure reducing mechanism connected to the pressure reducing tank, and the bottom side of the washing table can be cleaned by vibrating the washing table. A vibration mechanism is provided to remove dirt accumulated on the washing table by dropping it from the washing table.

Further, the vibration mechanism may be operable in a cleaning liquid stored in the vacuum tank or in cleaning steam generated in the vacuum tank. By operating the vibrating mechanism during liquid cleaning or steam cleaning in this way, dirt separated from the object to be cleaned on the washing table can be caused to fall downward from the washing table even during liquid cleaning or steam cleaning. It can be removed by

Further, a cleaning liquid is stored in the vacuum tank, and the cleaning liquid can be used to wash the object to be cleaned, and the object to be cleaned, which is placed on the washing table, is placed above the level of the cleaning liquid. In this case, the object to be cleaned may be steam-cleaned, and the object to be cleaned may be placed in the isolation chamber, so that the object to be cleaned can be dried under reduced pressure.

Further, the isolation chamber may be capable of maintaining a heated state at a constant temperature by a heating mechanism provided in the reduced pressure tank, and the bottom side of the reduced pressure tank is provided with a cooling mechanism provided in the reduced pressure tank. It may also be possible to maintain a cooling state at a constant temperature. This makes it possible to always keep the cleaning liquid in a heated state when drying in the isolation chamber, and to keep the cleaning liquid in a cooled state when cleaning the bottom side, so the entire tank is heated each time. There is no need for cleaning or cooling, and it is possible to efficiently perform liquid cleaning and vacuum drying of items to be cleaned in one tank while suppressing loss of thermal energy.

In addition, a steam generation tank for sending cleaning steam to the vacuum tank is provided separately from the vacuum tank, and the top side of the vacuum tank is equipped with a tank that can depressurize the tank and/or the isolation room. It may also be connected to a pressure reducing mechanism.

Further, the cleaning liquid may be a flammable solvent with a boiling point of 100° C. or higher, and the vibration mechanism may be an electric or air vibrator, or an ultrasonic vibrator.

The present invention is configured as described above, and since a vibration mechanism is provided on the bottom side of the cleaning table, by operating the vibration mechanism, cutting waste, press waste, or It becomes possible to remove dirt, such as chips, separated from the object to be cleaned by dropping it from the cleaning table by vibration by the vibration mechanism.

Therefore, when the washing table is slid to form an isolation chamber, dirt is not deposited on the periphery of the washing table, so the periphery and the inner circumferential surface of the decompression tank are kept in close contact with each other. It becomes possible to do so. Therefore, since the degree of sealing in the isolation chamber can be increased, depressurization of the isolation chamber can be performed smoothly. Furthermore, since there is no dirt accumulated in the isolation room other than the items to be cleaned, only vacuum drying of the items to be cleaned is performed, so the drying work can be carried out efficiently in a short time. becomes possible.

FIG. 2 is a conceptual diagram at the time of liquid cleaning in Example 1 showing the present invention. In Example 1, a conceptual diagram at the time of steam cleaning. In Example 1, a conceptual diagram at the time of reduced pressure drying. A conceptual diagram of a conventional example.

Embodiment 1 of the present invention will be explained with reference to FIG. 1. (1) is a depressurizing tank, which is capable of reducing the pressure inside, and has a stepped part (2) in the circumferential direction in the center, and a bottom surface ( The inner diameter of the top surface (4) side is narrower than that of the 3) side. Further, the pressure reduction tank (1) is connected to a pressure reduction pump (6) through a pressure reduction pipe (5).

A flat plate-shaped washing table (7) is provided inside the decompression tank (1). This washing stand (7) can be freely slid up and down between the bottom of the decompression tank (1) and the stepped part (2) by a drive mechanism (not shown). Then, slide the washing table (7) upward and bring the periphery (8) of the washing table (7) into close contact with the inner peripheral surface (33) of the step (2) of the decompression tank (1). By doing so, a sealed isolation chamber (10) can be formed by the top surface (4) side of the decompression tank (1) and the washing table (7).

Furthermore, an electric vibrator is connected to the bottom of the washing table (7) as a vibration mechanism (11) for vibrating the washing table (7). Although an electric vibrator is used in this embodiment, the present invention is not limited to this, and an air vibrator or an ultrasonic vibrator may also be used in other different embodiments. In addition, a heating mechanism (12) is disposed covering the vacuum tank (1) from the stepped portion (2) to the top surface (4), and a heating mechanism (12) is provided on the bottom surface (3) side of the vacuum tank (1). Contains a cleaning solvent (30) for liquid cleaning of the cleaning object (32). Further, a cooling mechanism (not shown) for cooling the cleaning liquid (27) stored in the vacuum tank (1) is provided on the bottom (3) side of the vacuum tank (1). The heating mechanism (12) and the cooling mechanism are capable of maintaining a heating state and a cooling state at a constant temperature, respectively.

Separately from this pressure reducing tank (1), a steam generating tank (13) for cleaning solvent (30) is provided. The bottom side of the steam generation tank (13) can communicate with the bottom side of the pressure reducing tank (1) through a first pipe (14). Note that the first pipe (14) is provided with a first on-off valve (15).

In addition, the top surface (20) of the steam generation tank (13) and the top surface (4) side of the decompression tank (1) are communicated through the second piping (16) and third piping (17) described below. It is possible. That is, the second pipe (16) has one end connected to the decompression tank (1), and the other end connected to the decompression pump (6) through the cooler (18). One end of a third pipe (17) branched from the second pipe (16) is connected to the top surface (20) of the steam generation tank (13).

The second pipe (16) also has a second on-off valve (21) located closer to the pressure reducing tank (1) than the branch point (24) of the third pipe (17), and A third on-off valve (22) is provided closer to the pressure reducing pump (6), and a fourth on-off valve (23) is provided on the third pipe (17). Also, on the bottom side of the steam generation tank (13), there is a device for heating the cleaning solvent (30) stored in the steam generation tank (13) to generate cleaning vapor (31) of the cleaning solvent (30). A heating element (25) is provided. Note that the second pipe (16), the pressure reduction pipe (5), and the pressure reduction pump (6) constitute the pressure reduction mechanism (26) of this embodiment.

Further, as shown in FIG. 1, the decompression tank (1) is provided with a supply pipe (34) for supplying nitrogen gas. The supply pipe (34) branches into a first supply pipe (35) and a second supply pipe (36), and the first supply pipe (35) is connected to the top surface (4) of the decompression tank (1). At the same time, the second supply pipe (36) is connected to the lower part of the step part (2). A fifth on-off valve (37) is provided on the first supply pipe (35), and a sixth on-off valve (38) is provided on the second supply pipe (36). Further, the pressure reducing pipe (5) is provided with a seventh on-off valve (40).

A method of cleaning an object to be cleaned (32) using the vacuum cleaning apparatus configured as described above will be described below. First, the cleaning liquid (27) is stored in the vacuum tank (1). In this example, a hydrocarbon solvent with a boiling point of about 170° C. is used as the cleaning liquid (27). Also, a cleaning solvent (30) that is the same as the cleaning liquid (27) in the decompression tank (1) is stored in the steam generation tank (13), and the heating element (25) of the steam generation tank (13) is heated. By operating, the cleaning solvent (30) in the steam generation tank (13) is heated to generate cleaning steam (31).

Then, perform the following liquid cleaning. That is, the first on-off valve (15), the second on-off valve (21), the fifth on-off valve (37), and the sixth on-off valve (38) are closed, and the third on-off valve (22) and the fourth on-off valve (22) are closed. Open valve (23). In this state, as shown in FIG. The object to be cleaned (32) is immersed in cleaning by moving it to the 3) side and immersing it in the cleaning liquid (27) cooled by the cooling mechanism of the reduced pressure tank (1) as described above.

In addition, during this immersion cleaning, the third on-off valve (22) and the fourth on-off valve (23) are opened as described above, and the cleaning steam (31) generated in the steam generation tank (13) is transferred to the third on-off valve (22) and the fourth on-off valve (23). Distillation of the cleaning vapor (31) can be carried out by cooling it with a cooler (18) through the pipe (17) and the branch point (24).

By activating the vibration mechanism (11) provided on the washing table (7) and vibrating the washing table (7), the object to be cleaned (32) falls off and lands on the washing table (7). The accumulated dirt can further fall downward from the washing table (7) by the vibration of the vibration mechanism (11).

Next, after the immersion cleaning of the object to be cleaned (32) is completed, the cleaning table (7) is placed above the liquid level (28) of the cleaning liquid (27) as shown in FIG. Then, with the second on-off valve (21), the fourth on-off valve (23), and the seventh on-off valve (40) opened and the third on-off valve (22) closed, the pressure reducing pump (6) is opened. Activate. As a result, the pressure inside the pressure reduction tank (1) is reduced through the pressure reduction pipe (5) and the second pipe (16).

In such a state, the cleaning vapor (31) of the cleaning solvent (30) generated in the steam generation tank (13) flows through the third pipe (17) and the second pipe (16) to the vacuum tank (1). flow inside. As a result, the cleaning steam (31) is stored in the reduced pressure tank (1), and the object to be cleaned (32) is steam-cleaned by the cleaning steam (31). During this steam cleaning, the vibration mechanism (11) of the cleaning table (7) is activated to vibrate the cleaning table (7) in the same way as in the case of immersion cleaning. Since the fallen dirt can be dropped downward from the washing table (7), it is possible to prevent dirt from accumulating on the washing table (7).

At the end of steam cleaning, the fourth on-off valve (23) is closed to stop the supply of cleaning steam (31) from the steam generation tank (13) to the decompression tank (1), and the cleaning table ( 7) further upwards to bring the periphery (8) of the washing table (7) into close contact with the inner circumferential surface (33) of the stepped portion (2) of the decompression tank (1). As a result, a sealed isolation chamber (10) is formed by the top surface (4) of the decompression tank (1) and the cleaning table (7), and as shown in FIG. ) The object to be cleaned (32) is placed in the space.

By forming the isolation chamber (10) as described above, the object to be cleaned (32) can be placed in a narrow, sealed space of the isolation chamber (10). In addition, as mentioned above, during immersion cleaning and/or steam cleaning, the vibration mechanism (11) of the cleaning table (7) is operated to remove dirt accumulated on the cleaning table (7). (7) Almost no dirt remains.

If the object to be cleaned (32) is not very dirty, only the vibration mechanism (11) is used to remove the stain from the washing table (7) during immersion cleaning, and the vibration mechanism (11) is used to remove the stain during steam cleaning. It is not necessary to remove the dirt, but if there is a lot of dirt, it is more effective to remove the dirt from the washing table (7) using the vibration mechanism (11) not only during immersion cleaning but also during steam cleaning. It is.

This makes it possible to more reliably bring the inner peripheral surface (33) of the stepped portion (2) of the decompression tank (1) into close contact with the peripheral edge (8) of the washing table (7). Since the chamber (10) can be made more airtight, no extra energy is required to reduce the pressure in the isolation chamber (10). In addition, by opening the second on-off valve (21) and the third on-off valve (22) and operating the pressure reducing pump (6) with the seventh on-off valve (40) closed, (10) It becomes possible to further increase the degree of reduced pressure. Furthermore, since there is almost no dirt left on the washing stand (7), the dirty parts are not dried, making it possible to dry more quickly and efficiently.

Furthermore, as shown in FIG. 3, since the outer periphery of the isolation chamber (10) is covered with a heating mechanism (12), the isolation chamber (10) can be kept in a heated state at all times. Therefore, even if the cleaning steam (31) comes into contact with the inner wall of the isolation chamber (10), the cleaning steam (31) is unlikely to condense and liquefy on the inner wall.

Therefore, since the condensate of the cleaning steam (31) does not adhere to the inner wall of the isolation chamber (10), only the object to be cleaned (32) in the isolation chamber (10) is to be dried, so the drying time is reduced. It can be made shorter. Further, since the cleaning solvent (30) having a high boiling point is dried in the isolated chamber (10) under reduced pressure as described above, the drying work can be safely performed at a low temperature of around 100°C.

After all the cleaning steps are completed, the reduced pressure state in the reduced pressure tank (1) is released. That is, by first opening the sixth on-off valve (38), nitrogen gas flows into the decompression tank (1) through the sixth on-off valve (38), and the isolation chamber in the decompression tank (1) is The reduced pressure state in spaces other than (10) is released. Thereafter, by opening the fifth on-off valve (37), nitrogen gas flows into the isolation chamber (10) through the fifth on-off valve (37), and the space inside the isolation chamber (10) is The reduced pressure state is released. As a result, the reduced pressure state of the entire reduced pressure tank (1) is released, and all cleaning steps in this embodiment are completed.

1 Decompression tank 3 Bottom surface 4 Top surface 7 Washing table 8 Periphery 10 Isolation chamber 11 Vibration mechanism 12 Heating mechanism 13 Steam generation tank 26 Decompression mechanism 27 Cleaning liquid 28 Liquid surface 31 Cleaning steam 32 Object to be cleaned 33 Inner peripheral surface

Claims (7)

A plate-shaped washing stand on which objects to be cleaned can be placed is provided in the reduced pressure tank, and the washing stand can be slid up and down inside the reduced pressure tank by a drive mechanism, and the periphery of the washing stand is connected to the reduced pressure tank. By closely contacting the inner peripheral surface of the decompression tank, the space inside the decompression tank can be airtightly separated into the top side and the bottom side, and the isolation chamber formed by the top side of the decompression tank and the washing stand A reduced-pressure cleaning device, characterized in that the pressure can be reduced by a pressure-reducing mechanism connected to the reduced-pressure tank, and a vibration mechanism for vibrating the washing stand is provided on the bottom side of the washing stand. 2. The reduced pressure cleaning apparatus according to claim 1, wherein the vibration mechanism is operable in a cleaning liquid stored in the reduced pressure tank or in cleaning steam generated in the reduced pressure tank. A cleaning liquid is stored in the reduced pressure tank, and the cleaning liquid can be used to wash the object to be cleaned, and the object to be cleaned, which is placed on the washing table, is placed above the level of the cleaning liquid, 2. The vacuum cleaning apparatus according to claim 1, wherein the vacuum cleaning apparatus enables steam cleaning of the object to be cleaned, and also enables vacuum drying of the object by arranging the object to be cleaned in the isolation chamber. . 2. The vacuum cleaning apparatus according to claim 1, wherein the isolation chamber can maintain a heated state at a constant temperature by a heating mechanism provided in the vacuum tank. Separately from the pressure reduction tank, a steam generation tank is provided to send cleaning steam to the pressure reduction tank, and on the top side of the pressure reduction tank, the pressure reduction tank and/or the isolation room can be depressurized. 2. The reduced pressure cleaning device according to claim 1, further comprising a reduced pressure mechanism connected thereto. 2. The vacuum cleaning apparatus according to claim 1, wherein the cleaning liquid is a flammable solvent having a boiling point of 100° C. or higher. 2. The reduced pressure cleaning device according to claim 1, wherein the vibration mechanism is an electric or air vibrator, or an ultrasonic vibrator.