JP3509738B2 - Dry ice injection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry ice injecting apparatus for producing dry ice particles and injecting them together with a dew condensation preventing gas.

[0002]

2. Description of the Related Art As a dry ice blasting device of this type, one shown in FIGS. 6 and 7, for example, is disclosed in Japanese Utility Model Registration Publication No. 2557383. Here, FIG. 6 is a vertical cross-sectional view of the dry ice spraying device according to the conventional example, and FIG. 7 is a piping diagram of the dry ice spraying device. This conventional example, the second cylinder B ₂ and the nitrogen gas introducing chamber 101b to the first cylinder B ₁ and carbon dioxide introduction chamber 101a connected with the pipeline, and reserving the nitrogen gas N ₂ was reservoir of liquefied carbon dioxide gas L Liquefied carbon dioxide gas L introduced into the carbon dioxide gas introduction chamber 101a is caused to flow into the gas expansion chamber 103 through the orifice 102 to generate dry ice particles D.
Is injected from the tip of the injection cylinder 105 together with the nitrogen gas N ₂ introduced into the gas expansion chamber 103. In FIG. 6, reference symbol P indicates a pressure gauge, S indicates an electromagnetic on-off valve, and B ₃ indicates a buffer tank.

[0003]

According to this dry ice jetting apparatus, since the dry ice particles D are jetted from the tip of the jetting cylinder 105 together with the nitrogen gas N ₂ which does not contain water, dew condensation occurs on the object to be treated. Can be prevented to some extent, but there is still room for improvement in the following points. In addition to the nitrogen gas N ₂ of the first cylinder B ₁ that reservoir of liquefied carbon dioxide gas L requires a second cylinder B ₂ that reservoir, moreover, a nitrogen gas introducing chamber in addition to the carbon dioxide introduction chamber 101a 10
1b and a passage for introducing the nitrogen gas N ₂ into the gas expansion chamber 103 are also required, which complicates the configuration and increases the cost.

The electromagnetic on-off valve S is opened to introduce the liquefied carbon dioxide gas L into the carbon dioxide gas introduction chamber 101 a, and the liquefied carbon dioxide gas L is caused to flow out into the gas expansion chamber 103 via the orifice 102 to produce dry ice particles. D is generated, but since the electromagnetic opening / closing valve S is separately required in addition to the configuration (for example, a needle valve) for adjusting the opening degree of the orifice 102,
Also in this respect, the structure is complicated and the cost is high.

In the above conventional example, dry ice particles D
And the nitrogen gas N ₂ are mixed in the sufficiently long gas expansion chamber 103 and the mixture is injected, so that the layer of the nitrogen gas N ₂ surrounding the dry ice particles D becomes thin, and the air containing water is converted into nitrogen. The gas N ₂ layer cannot sufficiently block and the dew condensation prevention effect is not sufficient. The present invention has been made in view of such circumstances, and an object thereof is to provide a dry ice blasting device that can be implemented at a low cost with a simple configuration and that can effectively prevent dew condensation.

[0006]

In order to solve the above problems, the present invention is configured as follows. That is, claim 1
In the invention described in (1), the liquefied carbon dioxide gas L in the gas introduction chamber 1 is caused to flow into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D, and the dry ice particles D are condensed with the dew condensation prevention gas G. In addition, in the dry ice injection device configured to inject from the tip of the injection cylinder 5, a gas distribution portion 4 is provided at the base end side of the injection cylinder 5 downstream of the gas expansion chamber 3, and the dry flow is provided in the injection cylinder 5. The ice passage 6 and the gas passage 7 are partitioned and formed, and the heating means 8 is disposed in the gas passage 7 in the vicinity thereof so that the mixed fluid of the dry ice particles D and the carbon dioxide gas in the gas expansion chamber 3 is divided into the flow dividing section. 5, the mixed fluid containing the dry ice particles D is circulated in the dry ice passage 6 and the mixed fluid circulated in the gas passage 7 is heated by the heating means 8 to generate the dew condensation preventing gas G. It was constructed so that, characterized in that.

The invention according to claim 2 is the dry ice jetting device according to claim 1, wherein, for example, as shown in FIG. 4, the gas introducing chamber 1, the gas expanding chamber 3, and the gas dividing portion 4 are close to each other. Then, the temperature drop preventing means 45 is arranged.

According to a third aspect of the present invention, in the dry ice spraying device according to the first or second aspect, the guide cylinder 10 is mounted in the spray cylinder 5, and the guide cylinder 1 is installed.
0, the dry ice passage 6 is formed, the gas passage 7 is formed around the guide cylinder 10, the charging means 35 is attached to the injection cylinder 5, and the charging means 35 is formed.
Is provided with one plate-shaped electrode 36 fitted in the injection cylinder 5, and the discharge part 37 formed on the inner peripheral part of the electrode 36 is exposed to the gas passage 7 to form the other electrode. It is characterized in that it is arranged so as to face the guide cylinder 10.

According to a fourth aspect of the present invention, the liquefied carbon dioxide gas L in the gas introduction chamber 1 is caused to flow into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D, and the dry ice particles are generated. In the dry ice injection device configured to inject D from the tip of the injection cylinder 5, the orifice valve 2 is provided with a partition wall 2 between the gas introduction chamber 1 and the gas expansion chamber 3.
Orifice hole 21 opened to 0 and this orifice hole 2
1, a valve rod 22 for opening and closing the orifice hole 21 to adjustably open and close the orifice hole 21, a valve closing spring 24 for urging the valve rod 22 toward the valve closing side, and a retracted position of the valve rod 22. It is characterized by comprising a stopper 25 that regulates the valve opening amount so as to set the valve opening amount, and a valve opening operation means 26 that operates the valve rod 22 against the valve closing spring 24.

According to a fifth aspect of the present invention, in the dry ice injection device according to the fourth aspect, the valve opening operation means 26 is formed integrally with the valve rod 22 coaxially and is provided so as to be movable back and forth. The driven rod 23 and the driven rod 23
A drive rod 27 that is juxtaposed with each other and is provided so as to be movable back and forth;
The pinion 28 engages with the driven rack 23a formed on the driven rod 23 and the drive rack 27a formed on the drive rod 27, and the manual operation lever 29 for moving the drive rod 27 forward and backward in an adjustable manner. , Is characterized.

According to a sixth aspect of the present invention, in the dry ice injection device according to the fourth aspect, the valve closing spring 24 is provided.
The spring force setting means 16 that adjustably sets the valve closing force is provided, and the driven rod 23 is urged toward the valve opening side by gas pressure at a position of the driven rod 23 located in the gas introducing chamber 1. By forming the pressure receiving step portion 23b, the valve closing force of the valve closing spring 24 and the valve opening force by the gas pressure are antagonized,
The orifice valve 2 is configured to function as a safety valve.

[0012]

According to the present invention, the following actions and effects are exhibited. (A) In the invention described in claim 1, for example, FIG.
As shown in, the liquefied carbon dioxide gas L in the gas introduction chamber 1 flows into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D. The mixed fluid of the dry ice particles D and the carbon dioxide gas in the gas expansion chamber 3 is split in the gas dividing portion 4 and flows into the dry ice passage 6 and the gas passage 7. Then, the mixed fluid containing the dry ice particles D flowing in the gas passage 7 is heated by the heating means 8 arranged in the vicinity of the gas passage 7 to become the dew condensation preventing gas G. The dew condensation preventing gas G is jetted together with the dry ice particles D flowing through the dry ice passage 6 from the tip of the jet cylinder 5 to prevent dew condensation on the object to be treated. That is, a single liquefied carbon dioxide gas L
By generating and injecting the dry ice particles D and the dew condensation preventing gas G by using, the nitrogen gas N ₂ as the dew condensation preventing gas as in the conventional example, the nitrogen gas introducing chamber 101b, and the nitrogen gas N ₂ are expanded. A passage to be introduced into the chamber 103 is also unnecessary, and it can be implemented at a low cost with a simple structure. Moreover, since the dry ice particles D and the dew condensation preventing gas G are jetted through different passages, it is possible to surround the dry ice particles D with the dew condensation preventing gas G and effectively form the dew condensation. It can be prevented.

(B) In the invention described in claim 2, in the dry ice jetting device according to claim 1, for example, FIG.
As shown in FIG. 3, since the temperature drop preventing means 45 is arranged in the vicinity of the gas introduction chamber 1, the gas expansion chamber 3 and the gas distribution portion 4, it prevents dew condensation on the outer surface of the apparatus main body 11 and the orifice valve 2. Adhesion of dry ice and freezing of a small amount of water contained in carbon dioxide can be prevented, and at the same time, the production efficiency of dry ice particles D can be increased.

(C) In the invention described in claim 3, for example, as shown in FIG. 3, one plate-shaped electrode 36 constituting the charging means 35 is fitted in the injection cylinder 5 and the electrode 36 is charged. Since the discharge portion 37 formed on the inner peripheral portion faces the gas passage 7 and is arranged to face the guide cylinder 10 forming the other electrode, one of the dew condensation preventing gas G is ionized. The ionized anti-condensation gas G removes the electrostatic charge of the sprayed dry ice particles D and increases the flow velocity and charge density thereof. The increased charge density also eliminates the electrostatic charge generated when the dry ice particles D collide with the object. Moreover, according to the said structure, the high voltage | pressure charging means 35 can be accommodated in the injection cylinder 5, and can be comprised safely and compactly.

(D) In the invention described in claim 4, for example, as shown in FIGS. 1 and 2, the liquefied carbon dioxide gas L in the gas introduction chamber 1 is introduced into the gas expansion chamber 3 through the orifice valve 2. It flows out to produce dry ice particles D. Orifice hole 21 opened in partition wall 20 between gas introduction chamber 1 and gas expansion chamber 3
The valve opening is adjusted by inserting the valve rod 22 into the orifice hole 21 so that the advancing / retreating position can be adjusted. That is, the retracted position of the valve rod 22 is regulated by the stopper 25 so that the opening amount of the orifice valve 2 is set. According to this structure, the valve opening operation means 26 opens the valve rod 22 against the valve closing spring 24 up to the position where it is regulated by the stopper 25, so that the valve opening 22 is instantly fully opened with a desired valve opening amount. be able to.

In a fifth aspect of the present invention, for example, as shown in FIG. 1, the valve opening operation means 26 is formed coaxially and integrally with the valve rod 22 and is provided with a follower rod 2 which is provided so as to be movable back and forth.
3, a drive rod 27 juxtaposed with the driven rod 23 so as to be movable back and forth, a driven rack 23a formed on the driven rod 23, and a drive rack 27a formed on the drive rod 27. 28, and a manual operation lever 29 for advancing and retracting the drive rod 27 in an adjustable manner.
Since it does not require the electromagnetic on-off valve S as in the conventional example, it can be implemented at a low cost with a simple configuration. Moreover, the valve opening amount can be appropriately adjusted within the range regulated by the stopper 25 by the manual operation lever 29, which is convenient.

In the sixth aspect of the invention, for example, as shown in FIG. 1, the spring force setting means 16 is advanced and retracted to set the valve closing force of the valve closing spring 24 to be adjustable. Further, a pressure receiving step portion 23b for urging the driven rod 23 toward the valve opening side by gas pressure is formed at a position of the driven rod 23 located in the gas introduction chamber 1, and the gas in the gas introduction chamber 1 is formed. When the pressure rises and the pressure received by the pressure receiving step portion 23b exceeds the valve closing force of the valve closing spring 24, the liquefied carbon dioxide gas flows out to the gas expansion chamber 3 through the orifice hole 21, It is discharged to the outside of the machine through the dry ice passage 6 and the gas passage 7. In other words, the valve closing force of the valve closing spring 24 and the valve opening force of the gas pressure are opposed to each other, so that the orifice valve 2
Is safe because it functions as a safety valve.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a dry ice jetting apparatus according to the present invention will be described below with reference to the accompanying drawings. 1 shows a dry ice blasting device according to the present invention.
(A) is a vertical cross-sectional view of the dry ice jetting device, FIG.
1B is a vertical cross-sectional view taken along the line AA in FIG.
2A is a vertical cross-sectional view of the flow dividing portion of the dry ice injection device, and FIG. 2B is a vertical cross-sectional view taken along the line BB in FIG. 2A.

As shown in FIG. 1, this dry ice jetting apparatus has a gas introduction chamber 1, an orifice valve 2, and a gas expansion chamber 3
An apparatus main body 11 in which the gas separation unit 4 and the gas flow dividing unit 4 are housed in series, and an injection cylinder 5 provided coaxially with the apparatus main body 11 in series.
A grip portion 12 that supports the apparatus body 11 is assembled to form a pistol. Inside the grip portion 12, a gas introduction pipe 14, which will be described later, a conductive terminal 40 for the heating means 8, conductive wires 41 and 42, and a ground terminal 43 are additionally provided. In addition, a conductive terminal and a conductive wire of the charging unit 36, which will be described later, are separately provided.

As shown in FIG. 1, this dry ice jetting apparatus causes the liquefied carbon dioxide gas L in the gas introduction chamber 1 to flow into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D. The mixed fluid of the dry ice particles D and the carbon dioxide gas is divided into two by the gas dividing portion 4, one of the mixed fluids is circulated in the dry ice passage 6 formed in the axial center portion of the injection cylinder 5, and the other is Of the mixed fluid flowing through the gas passage 7 formed in the periphery of the dry ice passage 6, and the mixed fluid flowing through the gas passage 7 is heated by the heating means 8 arranged close to the gas passage 7 to cause dew condensation. The preventive gas G is generated, and the dry ice particles D that have flowed through the dry ice passage 6 are jetted from the tip of the jet cylinder 4 together with the dew condensation preventive gas G.

The gas introducing chamber 1 is, as shown in FIG.
The gas introduction chamber 1 is formed in the central portion of the apparatus main body 11 in the front-rear direction, and is connected to the introduction pipe 14 for the liquefied carbon dioxide gas L accommodated in the grip portion 12 via a communication passage 13. Further, the orifice valve 2 is, as shown in FIG.
An orifice hole 21 which is opened in a partition wall 20 between the gas introduction chamber 1 and the gas expansion chamber 3, a tapered taper valve rod 22 which is inserted into the orifice hole 21 so as to be capable of advancing and retracting and opens and closes the orifice hole 21, and A valve closing spring 24 for urging the valve rod 22 toward the valve closing side via a driven rod 23;
2 is composed of a stopper 25 that adjustably regulates the retreat position and sets the valve opening amount, and a valve opening operation means 26 that opens the valve rod 22 against the valve closing spring 24.

The valve closing spring 24 has the driven rod 23.
The flange 15 attached to the rear part of the rear body and the device body 11
It is screwed to the rear portion of the valve and is mounted between the spring receiving member 16 and the spring receiving member 16 that constitutes the spring force setting means. The spring receiving member 16 is adjusted forward and backward to adjust the valve closing force of the valve closing spring 24. It is configured. The stopper 25 is provided on the driven rod 2
It is screwed to the spring receiving member 16 so as to be concentric with 3, and regulates the retracted position of the driven rod 23 to be adjustable so as to set the valve opening amount of the valve rod 22. Reference numerals 17a and 17b denote fixing screws for fixing the spring receiver 16 and the stopper 25, respectively.

The valve opening operation means 26 is formed coaxially and integrally with the valve rod 22, and is provided with the driven rod 23 provided so as to be capable of advancing and retreating, and the drive provided so as to be juxtaposed with the driven rod 23 so as to be capable of advancing and retracting. The rod 27 and the driven rod 23
A pinion 28 that engages with a driven rack 23a formed on the drive rod 27 and a drive rack 27a formed on the drive rod 27.
And a manual operation lever 29 for advancing and retracting the drive rod 27 so as to adjust the position against the valve closing spring 24. The orifice valve 2 is opened by the manual operation lever 29 in an instant. There is. In this embodiment, an assisting spring 18 for assisting the drive rod 27 toward the valve closing side is provided in addition to the valve closing spring 24, but the assisting spring 18 may be omitted.

According to the above construction, the liquefied carbon dioxide gas L in the gas introduction chamber 1 flows out into the gas expansion chamber 3 via the orifice valve 2 and produces dry ice particles D. The partition 2
The opening degree of the orifice hole 21 opened at 0 is adjusted by inserting the valve rod 22 into the orifice hole 21 so that the forward / backward position can be adjusted. That is, the retracted position of the driven rod 23, which is formed coaxially and integrally with the valve rod 22 and is capable of advancing and retreating, is regulated by the stopper 25 so as to regulate the opening amount of the orifice valve 2. By operating the driven rod 23 to the position regulated by the stopper 25 against the valve closing spring 24 by the valve opening operation means 26, the desired valve opening amount can be fully opened instantaneously. That is, since the electromagnetic on-off valve S as in the conventional example is not required, it can be implemented at a low cost with a simple configuration. Moreover, the valve opening amount can be appropriately adjusted by operating the manual operation handle 29 within the range regulated by the stopper 25, which is convenient.

The insertion hole 27b of the drive rod 27 is closed by a closing plug 30. The closing plug 30 receives the rear end of the driving rod 27 in a positionally adjustable manner to close the valve closing spring 24. By canceling the force, the orifice hole 21 can be opened by an appropriate amount, and the mixed fluid can be passed through the gas passage 7 by an appropriate amount. In that case, the stopper 30, the drive rod 27, and the pinion 2
8 and the driven rod 23 function as overheat preventing means of the heating means 8, for example.

As shown in FIGS. 1A and 2A,
A flow dividing portion container 31 having the flow dividing portion 4 is screwed near the tip of the apparatus main body 11, and the gas dividing portion 4 is divided downstream of the gas expansion chamber 3 through a predetermined gap. It is configured by screwing the metal fitting 33 into the diverter housing 31. The shunt metal fitting 33 is shown in FIG.
As shown in (B), the central passage 6a is formed in the axial center portion,
Three peripheral passages 7a are formed in the peripheral portion, and the mixed fluid divided in the flow dividing portion 4 is configured to flow through the central passage 6a and the peripheral passages 7a.

By adjusting the screwing position of the flow-dividing fitting 33 forward and backward to adjust the clearance between the flow-dividing fitting 33 and the gas expansion chamber 3, the flow dividing ratio flowing through the central passage 6a and the peripheral passage 7a is appropriately adjusted. Can be set. By the way, when the flow rate of the dry ice particles D is increased or the cleaning power of the dry ice particles D is increased, the diversion ratio to the central passage 6a is increased. Also, condensation prevention gas G
In order to enhance the shielding property of the dry ice particles D due to, the diversion ratio to the peripheral passage 7a is increased.

FIG. 1 (A) shows the flow-dividing portion container 31.
As shown in (B), the heating part housing cylinder 32 is coaxially and integrally formed, and the heating part housing cylinder 32 is housed in the injection cylinder 5. A cylindrical guide cylinder 10 is coaxially mounted in the heating portion housing cylinder 32.
2 is coaxially and serially connected to the flow distribution metal fitting 33, as shown in FIG. 2 (A). In the guide cylinder 10, a dry ice passage 6 is formed in series with the central passage 6a, and a cylindrical gas passage 7 communicating with the peripheral passage 7a is formed around the dry ice passage 6. Further, inside the heating part housing cylinder 32, a heater 8 as a heating means is arranged in proximity to the outside of the gas passage 7. Further, as shown in FIGS. 1 (A) and 1 (B), a thermostat 34 is additionally provided in the lower space of the heating section housing cylinder 32 so as to control the heating temperature by the heater 8 at a constant level. It is configured.

According to the above construction, the mixed fluid containing the dry ice particles D is divided into two in the gas dividing portion 4, and one of the mixed fluids is formed in the dry ice passage formed in the axial center portion of the injection cylinder 5. 6 and the other mixed fluid flows through the gas passage 7, and the mixed fluid flowing through the gas passage 7 is heated by the heating means 8 arranged in the vicinity to become the dew condensation preventing gas G, and the dry ice passage 6 is discharged. Circulated dry ice particles D
The surroundings are surrounded by the heated dew condensation preventing gas G and sprayed from the tip of the spray cylinder 5. As a result, the dry ice particles D are used to remove the scale and clean the surface of the object to be processed, and the dew condensation prevention gas G surrounds the periphery of the dry ice particles D to remove the dry ice particles D from the air containing moisture. In addition, the heated dew condensation preventing gas G blows away the air containing moisture to prevent dew condensation on the object to be processed. Further, by keeping the object to be treated warm with the heated anti-condensation gas G, dew condensation due to the temperature decrease of the object to be treated is prevented.

Further, according to the above construction, the mixed fluid containing the dry ice particles D in the gas expansion chamber 3 is split in the flow dividing section 4, so that a single liquefied carbon dioxide gas L is used to generate dry ice particles. By generating and injecting the dew condensation preventing gas G, there is no need for a nitrogen gas or a nitrogen gas introduction chamber as a dew condensation preventing gas and a passage for introducing the nitrogen gas into the gas expansion chamber as in the conventional example, and a simple structure is provided. Can be implemented at low cost. By increasing the passage wall area of the gas passage 7,
It is desirable to increase the heating efficiency of the gas flowing through the gas passage 7. For that purpose, for example, the passage may be formed in a spiral shape or a female screw, or the gas retention time in the passage may be lengthened.

FIG. 3 shows a main part of the dry ice jetting apparatus according to the present invention. FIG. 3 (A) is a vertical sectional view of the jetting cylinder portion in FIG. 1 (A), and FIG. 3 (B) is FIG. FIG. 8 is a vertical cross-sectional view taken along the line C-C of the charging means 35 in A). As shown in FIGS. 3 (A) and 3 (B), a charging means 35 is attached near the tip of the injection cylinder 5. The charging means 35 is provided with one disk-shaped electrode 36 fitted in the injection cylinder 5 and the electrode 36.
The three discharge parts 37 formed on the inner peripheral part of the above are arranged so as to face the gas passage 7 and face the guide cylinder 10 constituting the other electrode, and a corona discharge is generated by loading about 5000 V, for example. Is configured.

The guide cylinder 10 which constitutes the other electrode.
3A, as shown in FIG. 3A, is screwed to the flow-dividing container 31 via the flow-dividing metal fitting 33.
It is electrically connected to the electrode terminal 44 connected to 1 through the flow dividing member 33. Note that reference numeral 38 in FIG. 3B indicates an electrode lead wire, and 39 indicates an insulator. According to the above configuration, one of the branched dew condensation preventing gas G is ionized at the outlet side of the gas passage 7. The ionized anti-condensation gas G removes the electrostatic charge of the sprayed dry ice particles D and increases the flow velocity and charge density thereof. The increased charge density also eliminates the electrostatic charge generated when the dry ice particles D collide with the object. Moreover, according to the said structure, the high voltage | pressure charging means 35 can be accommodated in the injection cylinder 4, and it can be comprised safely and compactly.

FIG. 3C is a view corresponding to FIG. 3B according to the first modification of the charging means. In this modified example 1, instead of the three discharge parts 37, a large number of discharge parts 37 are provided in the gas passage 7.
It is arranged so as to face the guide cylinder 10. Also, FIG. 3 (D) is related to the second modification of the charging means, as shown in FIG. 3 (B).
FIG. In the second modification, the plurality of discharge parts 3 are provided.
Instead of 7, the discharge unit 3 has a disk shape in a front view and a blade shape in a vertical cross section.
7 is arranged so as to face the gas passage 7 and to face the guide cylinder 10. Also in the first modification and the second modification, the same operation and effect as the embodiment of FIG.

FIG. 4 exemplifies the arrangement of temperature drop preventing means and the like mounted in the apparatus body 11.
4A is an external view of the apparatus main body 11, and FIG.
It is a BB line longitudinal cross-sectional view in (A). As shown in FIGS. 4 (A) and 4 (B), the apparatus body 11 is provided with a gas chamber containing hole 9 for containing the gas introduction chamber 1, the gas expansion chamber 3, and the gas flow dividing portion 4, and the drive rod 27. A rod mounting hole 19, a pair of left and right heater mounting holes 46, 46 for mounting the heater 45, which is a temperature drop preventing means, and a thermostat mounting hole 47. The pair of heaters 4
5 is arranged close to the lower side of the gas chamber enclosing hole 9 and extends over the gas introduction chamber 1, the gas expansion chamber 3 and the gas distribution portion 4 to prevent the temperature of the apparatus main body 11 from decreasing. It is intended to improve the generation efficiency of the dry ice particles D by preventing dew condensation on the outer surface thereof, adhering dry ice to the orifice valve 2, and preventing freezing of a small amount of water contained in carbon dioxide. .

FIG. 5 shows a modified arrangement example of the dry ice passage 6, the gas passage 7 and the heating means 8. FIG. 5 (A) is a view corresponding to FIG. 1 (B) according to the modified arrangement example 1, and in the modified arrangement example 1, the dry ice passage 6 and the gas passage 7 are arranged side by side in the heating portion housing cylinder 32, and A plurality of heating means 8 may be arranged close to the gas passage 7. 5B is a view corresponding to FIG. 1B according to the modified arrangement example 2. In the modified arrangement example 2, a single dry ice passage 6 is formed in the central portion of the heating portion housing cylinder 32. Two gas passages 7 are provided above and below the dry ice passage 6, and a plurality of heating means 8 are arranged in the vicinity of each gas passage 7.

In the modified arrangement example 1 and the modified arrangement example 2 as well, the mixed fluid containing dry ice particles is divided into two in the gas dividing portion 4, and one of the mixed fluids flows through the dry ice passage 6. The other mixed fluid circulates through the gas passage 7, and the mixed fluid that circulates through the gas passage 7 is heated by the heating means 8 arranged in proximity to become the dew condensation preventing gas G,
The dry ice particles D flowing through the dry ice passage 6 are jetted from the tip of the jet cylinder 5. Thus, the scale of the surface of the object to be processed and the cleaning process are performed with the dry ice particles, and the dew condensation preventing gas G prevents dew condensation of the object to be treated.

The present invention is not limited to the above-described embodiment, and various design changes can be made as follows, for example, within the scope not changing the gist of the present invention. The heating means 8 described in claim 1 may be any one as long as it heats and gasifies the dry ice particles D contained in the mixed fluid flowing in the gas passage 7. A fin or the like that absorbs heat from the outside air or the like and exchanges heat may be arranged close to the gas passage 7. The guide cylinder 10 described in claim 3 is not limited to the cylindrical shape and may be a polygonal shape. Further, the position of the charging means 35 is not limited to the position near the tip of the injection cylinder 5, and the power source of the charging means 35 is not limited to direct current. The valve opening operation means 26 described in claim 4 may use, for example, an electromagnetic opening / closing valve instead of the manual operation lever 29 and the like.

[Brief description of drawings]

1 shows a dry ice blasting device according to the present invention, FIG. 1 (A) is a longitudinal sectional view of the dry ice blasting device, FIG.
1B is a vertical cross-sectional view taken along the line AA in FIG.

FIG. 2 shows a main part of the dry ice jetting device, and FIG.
(A) is a vertical cross-sectional view of the flow dividing portion in FIG. 1 (A), and FIG. 2 (B).
FIG. 3 is a vertical sectional view taken along the line BB in FIG.

FIG. 3 shows a main part of the dry ice jetting device, and FIG.
3A is a vertical cross-sectional view of the injection cylinder portion in FIG.
3B is a vertical cross-sectional view of the charging means in FIG. 3A taken along the line CC, and FIG. 3C is a modification 1 of the charging means.
3B is a diagram corresponding to FIG. 3B and FIG. 3D is a diagram corresponding to FIG. 3B according to the second modification of the charging unit.

4A and 4B exemplify an arrangement configuration of temperature drop prevention means and the like mounted in the apparatus main body, FIG. 4A is an external view of the apparatus main body, and FIG. 4B is in FIG. 4A. FIG. 7 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 5 shows a modified arrangement example of a dry ice passage, a gas passage, and a heating means, and FIG.
FIG. 4B is a diagram corresponding to FIG. 4B, and FIG.
(B) It is a corresponding figure.

FIG. 6 is a vertical cross-sectional view of a dry ice jetting device according to a conventional example.

FIG. 7 is a piping diagram of a dry ice injection device according to a conventional example.

[Explanation of symbols]

1 ... Gas introduction chamber, 2 ... Orifice valve, 3 ... Gas expansion chamber,
4 ... Gas distribution part, 5 ... Injection cylinder, 6 ... Dry ice passage,
7 ... Gas passage, 8 ... Heating means (heater), 10 ... Guide cylinder, 16 ... Spring force setting means (spring receiver), 20 ... Partition wall, 21 ... Orifice hole, 22 ... Valve rod, 23 ... Follower rod, 23a ... following rack, 23b ... pressure receiving step, 24 ...
Valve closing spring, 25 ... stopper, 26 ... valve opening operation means, 27
... drive rod, 27a ... drive rack, 28 ... pinion,
29 ... Manual operation lever, 35 ... Charging means, 36 ... Anode,
37 ... Discharging part, 45 ... Temperature drop preventing means (heater), D
... Dry ice particles, G ... Dew condensation prevention gas, L ... Liquefied carbon dioxide gas.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-158599 (JP, A) JP-A-6-283489 (JP, A) JP-A-62-172161 (JP, A) JP-B-40- 2310 (JP, B1) Utility model registration 2557383 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B05B 7/00 B24C 1/00 B24C 5/00

Claims (6)

(57) [Claims] 1. A liquefied carbon dioxide gas (L) in a gas introduction chamber (1) is passed through an orifice valve (2) to a gas expansion chamber (3).
In the dry ice injection device configured to generate the dry ice particles (D) by inflowing into the interior and to inject the dry ice particles (D) together with the dew condensation preventing gas (G) from the tip of the injection cylinder (5), A gas distribution portion (4) is provided at the base end side of the injection cylinder (5) downstream of the gas expansion chamber (3), and a dry ice passage (6) and a gas passage (7) are provided in the injection pipe (5). And a heating means (8) are disposed in close proximity to the gas passage (7), and a mixed fluid of dry ice particles (D) and carbon dioxide gas in the gas expansion chamber (3) is divided into Divide into part (4),
Dry ice particles (D) in the dry ice passage (6)
And the mixed fluid flowing through the gas passage (7) is heated by the heating means (8) to generate the dew condensation preventing gas (G). Dry ice spray device. 2. The dry ice injection device according to claim 1, wherein a temperature drop preventing means (45) is provided in the vicinity of the gas introduction chamber (1), the gas expansion chamber (3), and the gas flow dividing portion (4). The dry ice spraying device is characterized in that. 3. The dry ice spraying device according to claim 1 or 2, wherein a guide cylinder (10) is mounted in the spray cylinder (5), and the dry ice is installed in the guide cylinder (10). While forming the passage (6), the gas passage (7) is formed around the guide cylinder (10), and the charging means (35) is attached to the injection cylinder (5). Includes a plate-shaped electrode (36) fitted inside the injection cylinder (5), and a discharge part (37) formed on the inner peripheral part of the electrode (36) is connected to the gas passage (7). A dry ice blasting device, which is arranged so as to face the guide tube (10) that constitutes the other electrode so as to face it. 4. A gas expansion chamber (3) for liquefied carbon dioxide (L) in the gas introduction chamber (1) through an orifice valve (2).
A dry ice injection device configured to inject the dry ice particles (D) into the interior of the injection cylinder (5) by injecting the dry ice particles (D) into the inside of the orifice valve (2). An orifice hole (21) opened in a partition wall (20) between the gas introduction chamber (1) and the gas expansion chamber (3), and the orifice hole (21) inserted into the orifice hole (21) so as to be able to move forward and backward. (22) for opening and closing the valve rod so that the valve rod (22) can be metered, a valve closing spring (24) for biasing the valve rod (22) toward the valve closing side, and a retracted position of the valve rod (22) are regulated to be adjustable Stopper (25) for setting the valve opening amount
And a valve opening operation means (26) for opening the valve rod (22) against the valve closing spring (24). 5. The dry ice injection device according to claim 4, wherein the valve opening operation means (26) is integrally formed coaxially with the valve rod (22) and is provided so as to be movable back and forth. 23), a drive rod (27) juxtaposed to the driven rod (23) and provided so as to be movable back and forth, a driven rack (23a) formed on the driven rod (23), and the drive rod (27). A pinion (28) that engages with the formed drive rack (27a), and the drive rod (2)
7. A dry ice spraying device comprising a manual operation lever (29) for advancing and retracting 7) in an adjustable manner. 6. The dry ice injection device according to claim 4, further comprising spring force setting means (16) for adjusting the valve closing force of the valve closing spring (24), and the driven rod (23). ), A pressure receiving step portion (23b) for urging the driven rod (23) toward the valve opening side by gas pressure is formed at a position located in the gas introduction chamber (1), and the valve closing spring (24) A dry ice injection device, characterized in that the orifice valve (2) is configured to function as a safety valve by antagonizing the valve closing force and the valve opening force by gas pressure.