JPS606351A - Wet type blast device - Google Patents

Abstract

PURPOSE:To perform effective flushing and degreasing processes as well as to improve the working efficiency of a solvent, by jetting a mixed solution of a low boiling point solvent and an abrasive to a processed work, and ciculating it inside a hermetically sealed vessel, while checking loss of the solvent to the smallest possible extent. CONSTITUTION:A mixed solution 2 of a low boiling point solvent such as dichlorodifluoromethane or the like and an abrasive is stored inside a lower tank 3 of a highly sealable processing vessel 1 and jetted to a processed work inside the vessel 1 from an injection nozzle 4 by a pump 6, then returned back to the tank 3 again, but dichlorodifluoromethane gas fed to a compressor 8 via a line 31 becomes a compressed high pressure one and is jetted as a pressure source for the mixed solution 2 pumped up by the pump 6 by way of an oil separator 9, a dryer 10 and a valve V1, thus kept in a state of being continuously balanced. In addition, the mixed solution 2 and the methane gas jetted out of the nozzle 4 are suddenly set free from the high pressure state whereby temperature drops to some extent so that temperature in the mixed solution 2 inside both the vessel 1 and the tank 3 becomes below an atmospheric boiling point.

Description

Detailed Description of the Invention Technical Field The present invention aims to eliminate surface hardness such as dirt, oil, rust, etc. attached to the workpiece by projecting a liquid mixture containing abrasive particles, which is an abrasive, onto the workpiece such as mechanical parts. The present invention relates to a wet blasting device for grinding, surface hardening, etc. of kimono.

BACKGROUND ART Conventionally, this type of wet blasting apparatus has a structure in which a liquid mixture of water and an abrasive material such as alumina or glass beads is injected from a nozzle together with compressed air. By spraying the mixed liquid, dirt and other adhered substances adhering to the surface and gaps of the object to be treated are removed, and the surface is finished.

However, in the conventional wet blasting equipment described above, since water is used as the spray liquid, sufficient cleaning and degreasing effects cannot be obtained, it takes time to process the workpiece, and the workpiece after grinding is It takes time to dry. In addition, since it contains water, it is difficult to collect the used abrasive, and it is troublesome to dispose of the filth that has been removed by grinding.

Now, in order to solve the above-mentioned conventional problems, the applicant of the present application filed a patent application filed in 1, in which a low and SJ point solvent that easily vaporizes and has a cleaning and degreasing effect is used as a liquid mixture. However, there are still problems in utilizing expensive low-boiling solvents without loss.

Purpose The present invention has been made in view of the above-mentioned problems.
The purpose of this is to use a low boiling point solvent as a liquid to effectively clean and degrease the workpiece.
Another object of the present invention is to provide a wet blasting device that can circulate and efficiently use a low boiling point solvent while minimizing its loss.

Embodiment Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

In the diagram showing the basic configuration of a wet blasting apparatus according to an embodiment of the present invention, reference number 1 is a processing container for processing objects to be processed (not shown) such as contaminated tools in a nuclear power plant, and is highly airtight. It is a structure that has characteristics. A tank 3 provided at the bottom of the processing container 1 stores a liquid mixture 2 made of a mixture of fluorocarbon, which is a low boiling point solvent, and an abrasive material such as alumina or glass beads. 4 is an injection nozzle. The mixed liquid 2 in the tank 3 is sent by the pump 6 through a line 30 and a valve v8, and is ejected from the injection nozzle 4 onto the object to be processed disposed in the processing container 1 together with fluorocarbon gas, which will be described later.

The spouted mixed liquid 2 returns to the tank 3 together with the solid matter removed from the object to be processed, but a portion of the Freon liquid is vaporized and is sent from the waste tube at the top of the processing container 1 to the line 31 where the filter 7 and valve v2 are located. and is sent to the compressor 8. The filter 7 is for removing particulates such as abrasives contained in the fluorocarbon gas. The fluorocarbon gas sent to the compressor 8 via the line 31 is compressed and becomes a high-pressure gas, which passes through the oil separator 9 and the dryer 10 to the line 32 and the valve v1.
The mixed liquid 2 is injected as a pressurized source through which the mixed liquid 2 is sucked up by the pump 6 described above. During operation, a continuous equilibrium state is maintained by the above circulation system.

Here, since the lubricating oil in the compressor 8 mixes with the freon gas, the oil separator 9 removes it and returns it to the compressor 8 via the pipes 33 and 34. This reduces lubricant consumption. The dryer 10 is used to remove moisture contained in the air since it is mixed with residual air or fluorocarbon gas in the processing container 1.

In addition, the line 30 and the injection nozzle 4 are
A part of the liquid mixture 2 circulating at high speed in the tank 3 is diverted to the stirring line 35 and directly returned to the tank 3. By returning from this stirring line 35, the mixed liquid 2 in the tank 3
This ensures that the fluorocarbon solution and the abrasive particles are mixed uniformly, and that only the abrasive particles are prevented from settling.

Now, since the mixed liquid 2 and the fluorocarbon gas injected from the injection nozzle 4 are suddenly released from a high pressure state, the self-cooling effect of the fluorocarbon gas acts and the temperature decreases. On the other hand, the temperature of the mixed liquid 2 that is circulated at high speed by the pump 6 increases due to the heat generated by the stirring described above, but in order to balance with the temperature drop mentioned above, the temperature in the processing container 1 and the mixed liquid 2 in the tank 3 increase. The temperature is kept below the temperature point of the fluorocarbon at atmospheric pressure.

Therefore, even if the door on the opening/closing side is opened when the object to be processed is taken into or taken out of the processing container 1, the consumption of fluorocarbons due to evaporation can be suppressed to a very small level. By increasing the amount of water and constantly maintaining the inside of the processing container during operation to be more negative or positive than the outside air, gas leakage is prevented and contaminants are prevented from being exposed to the outside.

A part of the high-pressure fluorocarbon gas discharged from the compressor 8 is divided into lines 36 and sent to the liquefier 12 via the pressure valve 11. The pressure valve 11 is compressed p! , 8 to adjust the suction and discharge by the processing container 1 to line 31 and line 3.
Excess residue is guided to the liquefier 12 so that the flow of fluorocarbon gas reaching the processing container 1 via the fluorocarbon gas 2 is maintained in an equilibrium state. Liquefier 12
The sent fluorocarbon gas is liquefied by the cooler 12-1, and residual air mixed in the fluorocarbon gas can be separated and removed from the exhaust pipe 12-1.

Further, the liquefied fluorocarbon is sent from the liquefier 12 to the distiller 13 via a line 37 and valve v3.

The freon sent to the distiller 13 is evaporated by heating by the heater 14 and condensed again by the cooler 13-1 from the refrigerator 19, and then sent to the next liquid reservoir 1 via the line 38.
Sent to 6. In addition, 15 is a water separator, and distiller 1
Remove residual moisture in 3. In addition, oil separated from the fluorocarbons by the above-mentioned distillation and accumulated in the lower part of the fractionator 13 (lubricating oil of the compressor 8 that could not be completely removed by the oil separator 9)
is returned to the compressor 8 via line 39.

The liquid reservoir 16 includes a cooler 16-1 including a refrigerator 19 to store distilled clean fluorocarbon. It also includes a liquid supply port 17 for supplying new liquid. A liquid supply pump 18 connected to the liquid storage device 16 supplies the stored fluorocarbon to the tank 3 in the processing container 1 through a line 40, and also supplies it to the injection nozzle 4.
The processed object is sent to the cleaning nozzle 5 for final cleaning. The fluorocarbon liquid is supplied to the cleaning nozzle 5 via a line 41 that branches off from a line 40. Also, the supply to the tank 3 and cleaning nozzle 5 is via valve 10.1.
By opening and closing 1, either one of them is performed at the same time or as necessary, and the supply amount is adjusted. A liquid level gauge 120 attached to the tank 3 detects a decrease and operates a liquid supply pump to maintain a constant liquid level so as to always maintain an appropriate liquid level.

Next, as described above, the mixed liquid 2 sucked up by the pump 6 is
A part of line 42. It passes through valve v7 and is sent to two cyclones 21. Mixed liquid 2 by cyclone 21
Fine abrasives crushed due to grinding by jetting from the jetting nozzle 4 and surface-fixed matter (cleaning dirt) removed from the treated object are separated and removed, and are dropped into a sludge tank 22 connected to the lower part. . With this system, it is possible to prevent fine dust such as abrasive material and cleaning dirt from accumulating in the tank 3. The remaining fluorocarbons after separation and removal by the cyclone 21 are recovered into the tank 3 via the line 43 and the valve V6. In addition, the tank 2
The fluorocarbon liquid mixed into the tank 2 returns to the tank 3 via the line 49 and the valve V9.

23 is a wet cyclone for recovering the abrasive material in the tank 3 to the outside. The wet cyclone 23 connects to the tank 3 via a line 44 connected at A and A' in the figure.
The abrasive material is separated from the mixed liquid 2 sent from inside the tank 3.

The separated abrasive material is stored in a recovery tank 24. Further, the remaining fluorocarbon is returned to the tank 3 via the line 45.

Note that the cleaning filth and abrasive materials stored in the sludge tank 22 and recovery tank 24 contain fluorocarbons, but in that case, the lines of the sludge tank 22 can be removed by operating the help V5, V9, valve V13, etc. 46
, if the line 47 (connected at B, B') of the recovery tank 24 is communicated with the line 31.48 on the suction side of the compressor 8, the suction of the compressor 8 will cause the sludge tank 22 to
, the fluorocarbons in the recovery tank 24 are vaporized and recovered, and then transferred to the tank 2.
2. The cleaning dirt and polishing + tx material remaining in the chamber will dry in a short time. This makes it extremely easy to dispose of the washed dirt and recovered abrasive material. Furthermore, after the abrasive material has been collected through the above operations, the fluorocarbon in the tank 3 is removed by the valve V.
By operating only the compressor 8 with the valve v1 closed for two periods, the gas can be vaporized and recovered in the storage/liquid layer 16.

In this case, heating is performed by the heater 25 in order to prevent a temperature drop due to heat of vaporization and to promote vaporization.

Further, 50 is a suction line for sucking up the mixed liquid 2 in the tank 3 and ejecting it from the injection nozzle 4 by using the venturi effect of the airflow of high-pressure freon gas instead of the pump 6 described above. When sucking up the mixed liquid 2 using the suction line 50, the valve V8 is closed and the valve V12 is opened.

When high-pressure fluorocarbon gas is sent from the line 32 through the valve V1, a negative pressure is created at the outlet of the injection nozzle 4, so the mixture m, 2 in the tank 3 is sucked up to the injection nozzle 4 via the suction line 50 due to the Venturi effect. , is injected from the injection nozzle 4 together with the fluorocarbon gas. When the mixed liquid 2 is sucked up using the Venturi effect, the cleaning and grinding effects are lower because the suction force is weaker and the injection flow rate is lower than when the pump 6 is used to suck up the mixed liquid 2. If the amount is small, sufficient effects can be obtained. Further, compared to the case where the pump 6 is used, there is an advantage that the power consumption is lower and the device can be simplified.

In the above, since the pump 6 and the suction line 50 are installed together, by adjusting the valves 8 and V12, the suction by the pump 6 or the suction by the line 50 can be selected as appropriate depending on the degree of contamination of the object to be treated. This makes cleaning and grinding very efficient and extremely convenient. Note that the pump 6 and the suction line 50 do not necessarily need to be installed together, and only one of the suction means may be provided depending on the application of the device.

The wet blasting device according to an embodiment of the present invention is constructed and operates as described above, and uses Freon, which is a low boiling point solvent that is easily lost due to vaporization but has excellent cleaning and degreasing effects, to minimize loss. It is intended to be used in a controlled and efficient manner.

According to this apparatus, the object to be processed can be processed quickly due to the good cleaning and degreasing effects of the fluorocarbon, and the fluorocarbon can be circulated and used without loss.

Further, due to the low boiling point of fluorocarbons, the object to be treated can be dried in a short time, and cleaning dirt and abrasive material can be dried and recovered in a short time. Furthermore, since the vaporized gas of fluorocarbon is pressurized and used for injection, a separate supply storage for compressed air is provided, like a conventional wet blasting device that injects a mixture of water and abrasive material 2 together with compressed air. There's no need.

Further, in the above embodiment, a case was shown in which a mixture 2 of a low-boiling point solvent, fluorocarbon, and an abrasive was used as the cleaning liquid, but fluorocarbon alone may be used as the cleaning liquid without mixing an abrasive. If the amount of dirt, oil, etc. adhering to the object to be treated is light, a sufficient cleaning effect can be obtained just by spraying Freon.

In this case, the cost required for cleaning will be reduced by the amount of the abrasive material, and the entire apparatus will be simplified because the wet cyclone 23 and recovery tank 24 for separating and recovering the used abrasive material will not be required. Although an example was shown in which fluorocarbon was used as the low-boiling point solvent, the same effect as the above-mentioned fluorocarbon solution can be obtained by using other low-boiling point solvents such as trichlorethylene and perchlorethylene. just,
Freon liquid would be most suitable in terms of nonflammability, S toxicity, and odorlessness.

In addition, in the above embodiment, the distiller 13 and the heater 14
Although the distillation system consisting of a liquid reservoir 16, a refrigerator 19, etc. is built into the apparatus, it may be provided separately if the same effect as described above can be obtained.

Effects According to the present invention, it is possible to effectively wash, degrease, etc. the object to be treated, and to achieve efficient use by circulation that minimizes the loss of the low boiling point solvent. In addition, since the vaporized gas of the low boiling point solvent is pressurized and injected, there is no need to provide a separate compressed air supply means unlike in conventional devices that use compressed air to inject mixed liquids, which simplifies the entire device. .

Further, by using a suction means that utilizes the venturi effect in place of the pump means, power consumption can be reduced and the entire apparatus can be further simplified.

It is most effective for decontamination work performed when disposing of radioactive contaminated materials. In this application, it is impossible for contaminants to scatter, so it is important to have a completely closed system (closed circulation system) like this device, and to separate dirt and abrasive particles after cleaning. The provision of a cyclone device for removal, the separation and recovery of solvents, and the ability to recover contaminated residue in a dry state are very useful in terms of minimizing waste and facilitating recovery.

[Brief explanation of the drawing]

The figure is a basic configuration diagram of a wet blasting device according to an embodiment of the present invention. Here, 1... processing container, 2... mixed liquid, 3...
Tank, 4... Injection nozzle, 6... Pump, 8...
・Compressor, 12... liquefier, 13 distiller, 16...
Liquid reservoir, 21... cyclone, 22... sludge tank, 23... wet cyclone, 24... collection tank, 50... suction line. Patent applicant C.N.C. Co., Ltd. (and 2 others)

Claims (1)

[Scope of Claims] (1) A processing container equipped with a tank for storing a mixed liquid of a low boiling point solvent and an abrasive material, into which the processing object can be taken in and taken out, and which is airtight, and an interior of the tank. a pump means for supplying the mixed liquid to a nozzle provided in the processing container; and a pump for sucking and pressurizing the vaporized gas of the low boiling point solvent vaporized in the processing container, and injecting it from the nozzle together with the mixed liquid. A wet blasting device characterized by being equipped with a compressor. (2) A liquefier that liquefies a portion of the vaporized gas sucked in by the compressor, a distiller that distills the liquefied low-boiling solvent, and a liquid storage device that stores and supplies the distilled low-boiling solvent to the tank of the processing container. The first claim characterized in that
Wet blasting equipment as described in section. (3) An oil separator separates and removes the lubricating oil in the compressor that is added to the vaporized gas discharged by the compressor, and the separated lubricating oil is returned to the compressor. A wet blasting device according to claim 1. (4) A processing container equipped with a tank for storing a low boiling point solvent, into which the material to be processed can be taken in and taken out, and which can be closed; and a compressor for sucking and pressurizing the vaporized gas of the low boiling point solvent vaporized in the processing container and injecting it from the nozzle together with the mixed liquid. Characteristic wet blasting equipment. (5) Pressure 1i! A liquefier that liquefies a part of the vaporized gas inhaled by the machine, a distiller that distills the liquefied low boiling point solvent, and a liquid storage device that stores the distilled low boiling point solvent and supplies it to the tank of the processing container. A wet blasting apparatus according to claim 4, characterized in that: (6) A patent claim characterized in that the lubricating oil in the compressor mixed with the vaporized gas discharged by the compressor is separated and removed by an oil separator, and the separated lubricating oil is returned to the compressor. The wet blasting device according to item 4. (7) A processing container equipped with a tank for storing a mixed solution of a low-boiling point solvent and an abrasive material, which allows the processing object to be taken in and taken out and which can be sealed; A wet type, characterized in that it is equipped with a compressor for inhaling and pressurizing the vaporized gas of the adsorption agent using the venturi effect to be supplied to a nozzle provided in a processing container, and injecting it from the nozzle together with the n-mixed liquid. Blasting equipment. (8) A liquefier that liquefies a portion of the vaporized gas sucked in by the compressor, a distiller that distills the liquefied low-boiling solvent, and a liquid storage device that stores and supplies the distilled low-boiling solvent to the tank of the processing container. Claim No. 7 characterized in that
Wet blasting device (9) as described in section 9, wherein the lubricating oil in the compressor mixed with the vaporized gas discharged by the compressor is separated and removed by an oil separator, and the separated lubricating oil is returned to the compressor. A wet blasting device according to claim 7, characterized in that: (lO) A processing container equipped with a tank for storing a low-boiling point solvent, in which the processing object can be taken in and taken out, and the processing container can be sealed, and the mixed liquid in the tank is provided in the processing container. A suction means using a venturi effect to be supplied to the nozzle, and a compressor for sucking in the vaporized gas of the low boiling point solvent vaporized in the processing container, pressurizing it, and injecting it from the nozzle together with the mixed liquid. A wet blasting device that is characterized by (11) a liquefier that liquefies a portion of the vaporized gas sucked in by the compressor; a distiller that distills the liquefied low-boiling solvent;
The wet blasting apparatus according to claim 1O, further comprising a liquid reservoir for supplying the distilled low boiling point solvent to a tank of a storage processing container. (12) A patent characterized in that the lubricating oil in the compressor mixed with the vaporized gas discharged by the compressor is separated and removed by a device, and the separated lubricating oil is returned to the compressor. A wet blasting device according to claim 10.