JPH075841Y2 - Solvent reclaiming and recovering device using organic solvent - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The apparatus for reclaiming and recovering the solvent of a cleaning device using an organic solvent according to the present invention uses an organic solvent such as CFC to remove oil, etc. adhered to the surface of various articles. By incorporating it into a cleaning device that removes dirt, it is possible to prevent the vaporization of organic solvent vapor into the atmosphere and at the same time prevent deterioration of this organic solvent.

(Prior Art) Dirt such as oil adhered to the surface of various articles such as metal molds, porous sintered metal for air bearings, or IC substrates is used as a cleaning liquid with an organic solvent such as CFC and trichloroethylene. Cleaning with a thing is generally performed.

An example of a washer for performing washing work by using such an organic solvent as a washing liquid is described in Japanese Utility Model Application No. 63-5459.
The device shown in No. 5 will be described as an example.

As shown in FIG. 2, this cleaning device has a cleaning tank 2 having a bottomed cylindrical shape with an upper opening, and a lid 1 capable of hermetically closing the upper opening, and a heater for heating and evaporating an organic solvent. Three
And a vapor supply means 4 for feeding a vapor of an organic solvent having a relatively high temperature into the cleaning tank 2 through a pipe 5, and a storage tank 6 for storing the cleaning organic solvent to be fed into the cleaning tank 2. It is configured by combining a pipe 7 connecting the storage tank 6 and the cleaning tank 2, a heater 10 for heating and evaporating a liquid organic solvent, and a cooler 11 for condensing the vapor of the organic solvent. A distiller 12 for sending the formed organic solvent to the storage tank 6, a pipe 8 connecting the distiller 12 and the storage tank 6,
The liquid feed pump 9 provided in the middle of the pipe 8 is connected to the pipes 7 and 8 described above.
In combination with the cleaning tank 2 and the storage tank 6 or the distiller 12 for supplying and discharging a liquid organic solvent, an intake pipe 16 for sending air into the cleaning tank 2, and a vacuum in the middle. Pump 13
Connected to the ends of the discharge pipes 19 provided with the cleaning tank 2
It comprises an exhaust pipe 14 for feeding the organic solvent vapor discharged from the above into the distiller 12 and an exhaust pipe 15 for exhausting air from the cleaning tank 2.

An object to be cleaned is formed by the cleaning device of the present invention configured as described above.
In the case of cleaning 17, the lid 1 is opened to store the object to be cleaned 17 in the cleaning tank 2, and then the lid 1 is closed, and then the vacuum pump 13 is operated, and the exhaust pipe 15 is used to operate the cleaning tank. Two
Exhaust the air inside.

After the air in the cleaning tank 2 is discharged, the organic solvent in the storage tank 6 is fed into the cleaning tank 2 through the pipe 7 constituting the supply / discharge means 20 to clean the object to be cleaned 17. At this time, the cleaning tank 2
By energizing the ultrasonic vibrators 18, 18 fixed to the bottom surface of the container, ultrasonic vibration is applied to the organic solvent in the cleaning tank 2 so that the object to be cleaned 17 can be efficiently cleaned.

When the cleaning work with the liquid organic solvent is completed, the liquid feed solvent 9 constituting the supply / discharge means 20 is operated to gradually distill the liquid organic solvent in the cleaning tank 2 through the pipe 8.
While being sent to 12, the vapor of the organic solvent is supplied from the vapor supply means 4 into the cleaning tank 2.

As a result, part of the object to be cleaned 17 in the cleaning tank 2 is exposed on the liquid surface of the liquid organic solvent, the vapor of the organic solvent is condensed at this exposed part, and the condensed part of the object to be cleaned 17 is condensed. So-called steam cleaning, in which the surface is cleaned, is performed. Also, the used dirty organic solvent sent into the still 12 is
It is heated by the heater 10 provided in the above, evaporated, and then condensed and liquefied again by the cooler 11 to be regenerated and returned to the storage tank 6.

When all the liquid organic solvent in the cleaning tank 2 has been sent to the distiller 12 while performing the steam cleaning, the vacuum pump 13 provided in the middle of the discharge pipe 19 is operated to remain in the cleaning tank 2. The organic solvent vapor is discharged into the distiller 12 through the steam exhaust pipe 14. In this way, the distiller 12 is passed through the exhaust pipe 19 and the exhaust vapor pipe 14.
The vapor of the organic solvent discharged therein is condensed and liquefied by the cooler 11 provided in the distiller 12 and recovered. Cooler 11
The vapor of the organic solvent that could not be completely recovered by is recovered by the secondary cooler 21, and the trace amount of organic solvent vapor that could not be recovered by the secondary cooler 21 is collected by the activated carbon filter 22. .

When the inside of the cleaning tank 2 reaches a predetermined degree of vacuum with the operation of the vacuum pump 13, the vacuum pump 13 is stopped and air is sent into the cleaning tank 2 through the intake pipe 16.

As a result, when the pressure in the cleaning tank 2 rises to about atmospheric pressure, the lid 1 of the cleaning tank 2 is opened, and the object to be cleaned 17 for which the cleaning operation is completed is taken out.

(Problems to be solved by the device) However, in the distiller 12 which is a solvent regenerating and recovering device incorporated into the cleaning device according to the previous invention, which is constructed and operates as described above, the following will be described. It causes inconvenience.

That is, with the completion of the washing process, the washing tank 2 is moved to the distillation device.
When the organic solvent sent to 12 is heated and evaporated by the heater 10 and then condensed in the cooler 11, the pressure in the distiller 12 is lowered.

If the pressure inside the still 12 drops,
Outside air is sucked into the inside of the pipe 12 through the pipe 25, and while the water vapor contained in the outside air passes through the secondary cooler 21,
Alternatively, it touches the cooler 11 in the still 12 to condense and become water drops.

The water droplets generated in this way are cooled by the cooler 11 or the secondary cooler.
Since it mixes with the organic solvent condensed by 21 and is sent to the storage tank 6 as it is, the organic solvent stored in this storage tank 6 and sent into the cleaning tank 2 during the cleaning work is gradually deteriorated due to the mixing of water. Resulting in.

The solvent recovery / recovery device for an washer using the organic solvent of the present invention eliminates the above-mentioned disadvantages.

(Means for Solving the Problem) The solvent recovery / recovery device for an washer using the organic solvent of the present invention includes a cleaning tank that can be hermetically sealed while containing an object to be cleaned,
The organic solvent for cleaning is fed into the cleaning tank, and it is incorporated into a cleaning device using an organic solvent, which is composed of a supply means that can freely feed the cleaning solvent and a vacuum pump that discharges the gas existing in the cleaning tank. The used organic solvent is sent and regenerated, and the gas discharged from the vacuum pump is sent to recover the vapor of the organic solvent present in the gas.

Such a solvent recovery and recovery apparatus of the present invention is provided with a storage part for storing a liquid organic solvent and a bottom part of the storage part for heating and evaporating the liquid organic solvent present in the storage part. A heater, a cooler that is placed in a closed space above the reservoir and that condenses and liquefies the organic solvent, a receiver that receives the organic solvent condensed by this cooler, and a reusable dry inside A dehumidifier that is filled with the agent and removes water in the air passing through the inside from the suction port to the discharge port, a suction pipe having one end opened to the sealed space, and a suction pipe provided in the middle of the suction pipe. A first check valve that allows gas to pass only toward the space, one end connected to the other end of the suction pipe, and the other end connected to the discharge port of the dehumidifier, and an on-off valve was provided on the way. Hot air delivery with a first tube and a heater for heating air in the middle The intake pipe, one end of which is connected to the downstream side end of the warm air supply pipe, and the other end of which is connected to the warm air supply port provided at the lower end of the dehumidifier, and another on-off valve is provided in the middle. A second pipe and a secondary cooler for cooling the gas discharged from the closed space and containing the organic solvent vapor, condensing the organic solvent vapor in the gas, and recovering the organic solvent, and the secondary cooling device. The second check valve is provided in the middle of a pipe that connects the container installation portion and the external space, and allows a gas to pass only from the closed space to the external space.

Further, as shown in FIG. 1, the apparatus for regenerating and recovering a solvent for a cleaning device using an organic solvent according to claim 2 is a distiller similar to that incorporated in a conventional cleaning device using an organic solvent. 12 and the first and second dehumidifiers 26a and 26b are combined.

The distiller 12 therein is a storage section 27 for storing a liquid organic solvent, and a heater provided at the bottom of the storage section 27 for heating and evaporating the liquid organic solvent existing in the storage section 27.
10, a cooler 11 disposed in a closed space 28 provided above the reservoir 27, for condensing and liquefying the organic solvent vapor generated by the heating and evaporation by the heater 10, and the organic condensed by the cooler 11. It is composed of a receiving portion 29 which receives the solvent and sends it to the storage tank 6 (FIG. 2) and the like.

The first and second dehumidifiers 26a and 26b are filled with a desiccant such as silica gel or molicular sieves, which is reusable, inside a casing having an inlet and an outlet, respectively. The water in the air passing through the inside of the casing from the mouth to the outlet is removed.

Reference numeral 30 denotes a suction pipe whose one end is opened to the closed space 28 above the distiller 12, and the closed space 28 is provided in the middle of the suction pipe 30.
A first check valve 31 is provided to allow the gas to pass only toward.

Reference numeral 32 denotes a first branch pipe. One end of the first branch pipe 32 is connected to the other end of the suction pipe 30, and the other end is connected to the discharge port of the first dehumidifier 26a. Also, this first branch pipe 32
A first opening / closing valve 33 is provided in the middle of the
The inner flow path of is openable.

34 is a second branch pipe, one end of the second branch pipe 34 is connected to the other end of the suction pipe 30 together with the first branch pipe 32, the other end of the second branch pipe 34. Is connected to the discharge port of the second dehumidifier 26b. Further, a second opening / closing valve 35 is provided in the middle of the second branch pipe 34 to open / close the inner flow path of the second branch pipe 34.

Reference numeral 36 is a warm air blowing pipe, into which air is blown by a blower (not shown). A heater 37 for heating air is provided in the middle of the warm air blowing pipe 36 so that the temperature-increased air can be fed to the downstream side. I have to.

Reference numeral 38 denotes a third branch pipe. One end of the third branch pipe 38 is provided at the downstream end of the warm air feed pipe 36, and the other end is provided with warm air provided at the lower end of the first dehumidifier 26a. Each is connected to the delivery port. Further, a third opening / closing valve 39 is provided in the middle of the third branch pipe 38 to open / close the inner flow path of the third branch pipe 38.

40 is a fourth branch pipe. One end of the fourth branch pipe 40 is provided at the downstream end of the warm air feed pipe 36, and the other end is provided with warm air provided at the lower end of the second dehumidifier 26b. Each is connected to the delivery port. Further, a fourth opening / closing valve 41 is provided in the middle of the fourth branch pipe 40 to open and close the inner flow path of the fourth branch pipe 40.

The first to fourth on-off valves 33, 35, 39, 41 provided in the middle of the first to fourth branch pipes 32, 34, 38, 40 as described above are controlled to be opened and closed by a controller (not shown). However, in this opening / closing control, the first opening / closing valve 33 and the fourth opening / closing valve 41 are opened / closed in the same phase, and the second opening / closing valve 35 and the third opening / closing valve 39 are in the opposite phase. Open and close with.

That is, when the first opening / closing valve 33 is closed, the fourth opening / closing valve 41 is also closed, but the second and third opening / closing valves 35 and 39 are both in the open state. On the contrary, the first opening / closing valve 33
When is open, the fourth on-off valve 41 is also open, but the second and third on-off valves 35 and 39 are both closed.

Furthermore, when the pressure in the closed space 28 above the distiller 12 rises, in the middle of the pipe 25 for allowing the gas in the closed space 28 to escape to the outside, the closed space 28 is sequentially closed. 28
To pass the gas only to the external space, the second check valve 42 and the gas discharged from the closed space 28, containing the organic solvent vapor, is cooled, and the organic solvent vapor in this gas is condensed. And a secondary cooler 21 for collecting the organic solvent.

(Function) When the used organic solvent reclaiming and recovering apparatus using the organic solvent of the present invention configured as described above is used to recycle used organic solvent or recover organic solvent vapor The operation itself is the same as that of the distiller 12 incorporated in the above-described cleaning device of the invention.

However, in the apparatus for regenerating and recovering the solvent for the washer using the organic solvent of the present invention, the organic solvent vapor existing in the closed space above the still is condensed and liquefied by the cooler provided in this closed space. By doing so, when the pressure in the closed space decreases, the dehumidified outside air is sucked into the closed space through the dehumidifier, so that the water vapor contained in the air may condense in the closed space. And the deterioration of the organic solvent twisted due to the mixing of water is prevented.

For example, in the case of the solvent recovery / recovery apparatus described in claim 2 as shown in FIG. 1, when the controller opens the first opening / closing valve 33 and closes the second opening / closing valve 35. Is the outside air through the first dehumidifier 26a, the first branch pipe 32, the suction pipe 30,
It is sucked into the closed space 28 and compensates the pressure drop in the closed space 28 due to the condensation and liquefaction of the organic solvent vapor.

At this time, since the third on-off valve 39 is closed and the fourth on-off valve 41 is open, the air warmed by the heater 37 is sent into the second dehumidifier 26b, The desiccant filled in the second dehumidifier 26b is regenerated (moisture contained in the desiccant is evaporated and is diffused into the atmosphere).

As a result of repeating this operation, if the desiccant in the first dehumidifier 26a gets wet, the first to
The open / closed states of the fourth open / close valves 33, 35, 39, 41 are reversed.

That is, by closing the first opening / closing valve 33 and opening the second opening / closing valve 35, the outside air is removed from the second dehumidifier 26b, the second branch pipe 34,
The air is sucked into the closed space 28 through the suction pipe 30, and the pressure drop in the closed space 28 due to the condensation and liquefaction of the organic solvent vapor is compensated.

At this time, since the third opening / closing valve 39 is opened and the fourth opening / closing valve 41 is closed, the air warmed by the heater 37 is sent into the first dehumidifier 26a, The desiccant filled in one dehumidifier 26a is regenerated. Switching between the opening and closing of each on-off valve is automatically performed according to the number of times the washing machine is operated or a timer incorporated in the controller.

As a result, it is sent into the closed space 28 through the suction pipe 30,
The air that raises the pressure in the closed space 28 is always dry and free of water vapor.

Therefore, the water vapor in the air sucked into the closed space 28 is not condensed by the cooler 11 provided in the closed space 28, and water is contained in the organic solvent flowing down to the receiving portion 29 of the distiller 12. It will not be mixed, and the organic solvent for cleaning will not be deteriorated by the mixing of water.

The used organic solvent is sent to the storage section 27 of the distiller 12, or the organic solvent vapor existing in the cleaning tank 2 is closed space.
When the pressure in the closed space 28 rises by sending the gas into the closed space 28, the pressure in the closed space 28 is reduced by discharging the gas existing in the closed space 28 to the outside through the pipe 25. However, the organic solvent vapor contained in the gas is collected by being condensed by the cooler 11 arranged in the closed space 28, and the one that cannot be collected by the cooler 11 is a secondary one. Condensed and liquefied while passing through the cooler 21,
Be recovered. Therefore, if the capacity of the cooler 11 is sufficient,
The secondary cooler 21 may be omitted.

(Effects of the Invention) Since the apparatus for regenerating and recovering the solvent for the cleaning device using the organic solvent of the present invention is configured and operates as described above, the amount of the organic solvent released into the atmosphere can be reduced, and It is possible to effectively prevent the organic solvent from being deteriorated by mixing water with the organic solvent.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a first embodiment of a regeneration and recovery apparatus of the present invention, and FIG. 2 is a schematic vertical sectional view showing an example of a cleaning device. 1: Lid, 2: Cleaning tank, 3: Heater, 4: Steam supply means, 5: Pipe, 6:
Storage tank, 7, 8: Pipe, 9: Liquid feed pump, 10: Heater, 11: Cooler, 12: Distiller, 13: Vacuum pump, 14: Exhaust pipe, 15: Exhaust pipe, 16: Intake pipe, 17: Object to be cleaned, 18: Ultrasonic transducer, 19: Discharge pipe, 20: Supply / discharge means, 21: Secondary cooler, 22: Activated carbon filter, 23, 24: Valve, 25: Pipe, 26a: First Dehumidifier, 26b: second dehumidifier, 27: storage part, 28: closed space, 29: receiving part, 30: suction pipe, 31: first check valve, 32: first branch pipe, 33 : First on-off valve, 32: Second branch pipe, 35: Second on-off valve, 36: Warm air blowing pipe, 37: Heater, 38: Third branch pipe, 39: Third on-off valve, 40: 4th branch pipe, 41: 4th on-off valve, 42: 2nd check valve.

Claims (3)

[Scope of utility model registration request] 1. A cleaning tank which can be hermetically sealed in a state of containing an object to be cleaned, a supply means capable of feeding an organic solvent for cleaning into the cleaning tank, and a vacuum for discharging gas existing in the cleaning tank. It is present in this gas by incorporating it into a cleaning device that uses an organic solvent, which consists of a pump, and sending in the used organic solvent discharged from the cleaning tank for regeneration, as well as sending in the gas discharged from the above vacuum pump. A device for recovering and recovering the vapor of an organic solvent, which is a storage part for storing a liquid organic solvent, and a liquid organic solvent existing in the storage part, which is provided at the bottom of the storage part. A heater to evaporate, a cooler that is installed in a closed space above the reservoir and that condenses and liquefies the organic solvent, a receiver that receives the organic solvent condensed by this cooler, and a regeneration inside Own use And Do desiccant filled with a dehumidifier for removing the moisture in the air passing through the inside toward the discharge port from the suction port, the suction pipe is opened at one end to said closed space,
A first check valve, which is provided in the middle of this suction pipe and allows gas to pass only toward the closed space, and one end connected to the other end of the suction pipe and the other end connected to the discharge port of the dehumidifier, respectively. At the same time, the first pipe provided with an on-off valve in the middle, the warm air blowing pipe provided with a heater for heating air in the middle, one end to the downstream end of this warm air blowing pipe, the other end A second pipe connected to each of the hot air inlets provided at the lower end of the dehumidifier and provided with another on-off valve in the middle, and a gas discharged from the closed space containing the organic solvent vapor is cooled. The secondary cooler for condensing the organic solvent vapor in the gas to recover the organic solvent is provided in the middle of the pipe that connects the secondary cooler installation part and the external space, Cleaning using organic solvent, consisting of a second check valve that allows gas to pass only into the space Dexterity solvent regeneration recovery system. 2. A cleaning tank which can be hermetically sealed while containing an object to be cleaned, a supply means capable of feeding an organic solvent for cleaning into the cleaning tank, and a vacuum for discharging gas existing in the cleaning tank. It is present in this gas by incorporating it into a cleaning device that uses an organic solvent, which consists of a pump, and sending in the used organic solvent discharged from the cleaning tank for regeneration, as well as sending in the gas discharged from the above vacuum pump. A device for recovering and recovering the vapor of an organic solvent, which is a storage part for storing a liquid organic solvent, and a liquid organic solvent existing in the storage part, which is provided at the bottom of the storage part. A heater for evaporating, a cooler arranged in a closed space provided above the storage part for condensing and liquefying the organic solvent, a receiving part for receiving the organic solvent condensed by the cooler, and the inside of each To Filled with raw used freely desiccant,
First and second dehumidifiers for removing moisture in the air passing through the inside from the respective suction ports toward the discharge ports, a suction pipe having one end opened to the sealed space, and a middle of the suction pipe. A first check valve that is provided and allows gas to pass only toward the closed space, and has one end connected to the other end of the suction pipe and the other end connected to the discharge port of the first dehumidifier, A first branch pipe provided with a first on-off valve on the way, one end to the other end of the suction pipe, and the other end to the discharge port of the second dehumidifier,
A second branch pipe that is connected to each other and that has a second on-off valve in the middle, a warm air blowing pipe that has a heater for heating air in the middle, and one end of which is the downstream end of the warm air blowing pipe. Section, the other end is connected to a warm air inlet provided at the lower end of the first dehumidifier, and a third branch pipe provided with a third on-off valve in the middle, and one end is the warm air. At the downstream end of the feed pipe, the other end is connected to a warm air feed port provided at the lower end of the second dehumidifier, and a fourth branch pipe provided with a fourth on-off valve in the middle. , A controller for opening and closing the first opening and closing valve and the fourth opening and closing valve in the same phase, and opening and closing the second opening and closing valve and the third opening and closing valve in the opposite phase, and from the closed space A secondary cooler that cools the discharged gas containing organic solvent vapor, condenses the organic solvent vapor in this gas, and recovers the organic solvent. , Using a second check valve that is provided in the middle of a pipe that connects this secondary cooler installation portion and the external space and that allows gas to pass only from the closed space to the external space, using an organic solvent Recycling and recovery device for cleaning solvent 3. An apparatus for regenerating and recovering a solvent for a washing machine, which uses the organic solvent according to claim 1 or 2, wherein the secondary cooler is omitted.