WO2003095146A1

WO2003095146A1 - Dry ice injector

Info

Publication number: WO2003095146A1
Application number: PCT/JP2002/004598
Authority: WO
Inventors: Kazuyuki Sekota; Yoshifumi Tsuchiya
Original assignee: Itec Co., Ltd.
Priority date: 2000-11-14
Filing date: 2002-05-10
Publication date: 2003-11-20
Also published as: TW548141B

Abstract

A dry ice injector capable of injecting dry ice at a low cost with a simple structure, wherein liquefied carbon dioxide gas (L) in a gas chamber (1) is allowed to flow into a gas expansion chamber (3) through an orifice valve (2) to produce dry ice particles (D) and the dry ice particles (D) are injected from the tip of an injection tube (5) together with dew formation prevention gas (G), a gas dividing part (4) is provided on the base side of the injection tube (5) on the downstream side of the gas expansion chamber (3) and a dry ice passage (6) and a gas passage (7) are dividedly formed in the injection tube (5), a heating means (8) is disposed closely to the gas passage (7), the mixed fluid of the dry ice particles (D) inside the gas expansion chamber (3) and carbon dioxide gas is divided at the dividing part (4) to allow the mixed fluid containing the dry ice particles (D) to flow in the dry ice passage (6), and the mixed flow flowing through the gas passage (7) is heated by the heating means (8) to produce the dew formation prevention gas (G).

Description

Specification

Dry ice sprayer Technical field

The present invention relates to a dry ice injection device that generates dry ice particles and injects them together with a dew condensation preventing gas. Conventional technology

As this type of dry ice injection device, for example, the one shown in FIGS. 6 and 7 and disclosed in Utility Model Registration Publication No. 25557383 is known. Here, FIG. 6 is a longitudinal sectional view of the dry ice injection device according to the conventional example, and FIG. 7 is a piping diagram of the dry ice injection device.

In this conventional example, a first cylinder B1 storing liquefied carbon dioxide L and a carbon dioxide gas introducing chamber 101a are connected by a pipeline, and a second cylinder B2 storing nitrogen gas N2 is connected to a nitrogen cylinder. The raw gas introduction chamber 101b is connected to the raw gas introduction chamber 101b by a pipeline, and the liquefied carbon dioxide gas L introduced into the carbon dioxide gas introduction chamber 101a flows out into the gas expansion chamber 103 via the orifice 102. Thus, dry ice particles D are generated, and the dry ice particles D are 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, P indicates a pressure gauge, S indicates a solenoid on-off valve, and B3 indicates a buffer tank.

According to this dry ice injection device, since the dry ice particles D are injected from the tip of the injection cylinder 105 together with the nitrogen gas N2 containing no water, it is possible to prevent dew condensation on the object to some extent. However, there is room for improvement in the following points.

(1) In addition to the first cylinder B 1 storing liquefied carbon dioxide L, nitrogen gas N 2 is also stored. A second cylinder B2 is required, and a nitrogen gas introduction chamber 101b and a passage for introducing nitrogen gas N2 into the gas expansion chamber 103 in addition to the carbon dioxide gas introduction chamber 101a. Is necessary, and the configuration is complicated and costly.

(2) Open the solenoid on-off valve S to introduce the liquefied carbon dioxide gas L into the carbon dioxide gas introduction chamber 101a, and the liquefied carbon dioxide gas into the gas expansion chamber 103 via the orifice 102. Dry ice particles D are generated by flowing out to the orifice 102. However, in addition to the structure for adjusting the opening degree of the orifice 102 (for example, a needle valve), the above-mentioned electromagnetic on-off valve S is required separately, In this respect, the configuration is complicated and the cost is high.

(3) In the above conventional example, since the dry ice particles D and the nitrogen gas N 2 are mixed in a sufficiently long gas expansion chamber 103 and the mixture is injected, the nitrogen gas surrounding the dry ice particles D The N2 layer becomes thin, and air containing moisture cannot be sufficiently blocked by the nitrogen gas N2 layer, and the dew condensation preventing effect is not sufficient.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dry ice injection device that can be implemented at a low cost with a simple configuration and that can effectively prevent dew condensation. Disclosure of the invention

In order to solve the above problems, the present invention is configured as follows.

That is, the liquefied carbon dioxide gas L in the gas introduction chamber 1 is caused to flow out into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D, and the dry ice particles D are injected together with the dew condensation preventing gas G into the injection cylinder 5. In the dry ice spraying device configured to inject from the tip of the nozzle, a gas diverter 4 is provided downstream of the gas expansion chamber 3 at the base end side of the injection cylinder 5, and a dry ice passage 6 is provided in the injection cylinder 5. And a gas passage 7, and a heating means 8 is disposed in close proximity to the gas passage 7, and a mixed fluid of dry ice particles D and carbon dioxide in the gas expansion chamber 3 is divided by the branching section 5. Flush The mixed fluid containing the dry ice particles D is allowed to flow through the lye 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. Features.

For example, as shown in FIG. 1 and FIG. 2, the liquefied carbon dioxide gas L in the gas introduction chamber 1 flows out 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 diverted by the gas diverter 4 and flows through the dry ice passage 6 and the gas passage 7. Then, the mixed fluid containing the dry ice particles D flowing through the gas passage 7 is heated by the heating means 8 disposed close to the gas passage 7 to become the dew condensation preventing gas G. The dew condensation preventing gas G is injected from the tip of the injection cylinder 5 together with the dry ice particles D flowing through the dry ice passage 6 to prevent dew condensation on the object. In other words, by using a single liquefied carbon dioxide L to generate and inject the dry ice particles D and the dew-condensing gas G, nitrogen gas N2 and The introduction chamber 101b and the passage for introducing the nitrogen gas N2 into the gas expansion chamber 103 are not required, and can be implemented at a low cost with a simple configuration. Moreover, since the dry ice particles D and the dew condensation gas G are injected through different passages, the dew condensation gas G can surround the dry ice particles D, which is effective. Can prevent condensation.

In the above-described dry ice injection device, for example, as shown in FIG. 4, a temperature drop prevention means 45 can be arranged in the vicinity of the gas introduction chamber 1, the gas expansion chamber 3, and the gas branching section 4. . In this case, prevention of dew condensation on the outer surface of the device 1 1, prevention of adhesion of dry ice to the orifice valve 2, and icing of trace water contained in carbon dioxide, together with the efficiency of dry ice particle D generation Can be increased.

Further, in the above-mentioned dry ice injection device, a guide cylinder 10 is mounted in the injection cylinder 5, the dry ice passage 6 is formed in the guide cylinder 10, and the dry ice passage 6 is formed around the guide cylinder 10. The gas passage 7 is formed, and the charging means 35 is connected to the injection cylinder 5. The charging means 35 is provided with one plate-like electrode 36 fitted inside the injection cylinder 5, and a discharge part 37 formed on an inner peripheral portion of the electrode 36 is provided with the gas passage 7. And can be arranged to face the guide tube 10 constituting the other electrode.

In this case, for example, as shown in FIG. 3, one plate-like electrode 36 constituting the charging means 35 is fitted in the injection cylinder 5 and formed on the inner periphery of the electrode 36. Since the discharge part 37 faces the gas passage 7 and is arranged to face the guide cylinder 10 constituting the other electrode, one of the divided dew condensation preventing gases G is ionized. The ionized anti-condensation gas G eliminates the static charge of the injected dry ice particles D and increases the flow velocity and charge density. The increased charge density also eliminates the static charge generated when the dry ice particles D hit the target. Further, according to the above configuration, the high-pressure charging means 35 can be housed in the injection cylinder 5 and can be configured safely and compactly. Further, the present invention also provides a method for discharging liquefied carbon dioxide gas in the gas introduction chamber 1 into the gas expansion chamber 3 through the orifice valve 2 to generate dry ice particles D. In the dry ice injection device configured to inject from the tip of the orifice, the orifice valve 2 is connected to the orifice hole 21 opened in the partition wall 20 between the gas introduction chamber 1 and the gas expansion chamber 3, and the orifice hole 2 A valve stem 2 2 that can be inserted into and retracted from 1 to open and close the orifice hole 2 1 in a meterable manner, a valve closing panel 24 that urges the valve stem 22 to the valve closing side, and the above valve Stopper 25 that regulates the retraction position of rod 22 so that it can be adjusted to set the valve opening amount, and piles valve stem 22 on valve-closing panel 24 and opens the valve. And 6. In this case, as shown in FIGS. 1 and 2, for example, the liquefied carbon dioxide gas in the gas introduction chamber 1 flows out through the orifice valve 2 into the gas expansion chamber 3 to generate dry ice particles D. I do. The opening degree of the orifice hole 21 opened in the partition wall 20 between the gas introduction chamber 1 and the gas expansion chamber 3 is Insert the valve stem 22 into the chair hole 21 so that the advance / retreat position can be adjusted, and weigh it. That is, the retracted position of the valve stem 22 is regulated so as to be adjustable by the stopper 25, and the opening amount of the orifice valve 2 is set. According to this configuration, the valve stem 22 is piled on the valve-closing valve 24 by the valve-opening operation means 26, and the valve is opened to the position regulated by the storage valve 25. It can be fully opened instantaneously with the desired valve opening.

For example, as shown in FIG. 1, the above-mentioned dry ice injection device is configured such that the valve opening operation means 26 is coaxially and integrally formed with the valve stem 22 and is provided with a driven port which can be moved forward and backward. 23, a drive rod 27 arranged side by side with the driven rod 23 so as to be able to move forward and backward, a driven rack 23a formed on the driven rod 23 and a drive formed on the drive rod 27 It can be composed of a pinion 28 that engages with the rack 27a, and a manual operation lever 29 that moves the drive rod 27 in an adjustable manner. In this case, since the solenoid on-off valve S unlike the conventional example is not required, it can be implemented at a low cost with a simple configuration. In addition, the valve opening amount can be appropriately adjusted as needed within the range regulated by the stop lever 25 by the manual operation lever 29, which is convenient.

Further, as shown in FIG. 1, for example, the dry ice injection device includes a panel force setting means 16 for setting the valve closing force of the valve closing panel 24 so as to be adjustable, and the driven rod 23 A pressure receiving step 23 b 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 of the valve closing chamber 2. The valve can be configured to function as a safety valve by antagonizing the valve opening force due to pressure. In this case, if the gas pressure in the gas introduction chamber 1 increases and the pressure received by the pressure receiving step portion 23 b exceeds the valve closing force of the valve closing panel 24, the liquefied carbon dioxide gas becomes The gas flows out to the gas expansion chamber 3 through the orifice hole 21 and is discharged to the outside through the dry ice passage 6 and the gas passage 7. In other words, the orifice valve 2 functions as a safety valve because the valve closing force of the valve closing panel 24 and the valve opening force of the gas pressure oppose each other, so that it is safe. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows a dry ice injection device according to the present invention, FIG. 1 (A) is a longitudinal sectional view of the dry ice injection device, and FIG. 1 (B) is a line A—A in FIG. 1 (A). FIG. FIG. 2 shows a main part of the dry ice injection device, FIG. 2 (A) is a longitudinal sectional view of a branch portion of the dry ice injection device, and FIG. 2 (B) is FIG. 2 (A). FIG. 3 is a vertical sectional view taken along line B-B in FIG. FIG. 3 shows a main part of the dry ice injection device, FIG. 3 (A) is a longitudinal sectional view of the injection cylinder in FIG. 1 (A), and FIG. 3 (C) is a diagram corresponding to FIG. 3 (B) according to Modification 1 of the charging means, and FIG. 3 (D) is a drawing of the charging means. FIG. 6 is a diagram corresponding to FIG. 3 (B) according to Modification 2.

FIG. 4 shows an example of the arrangement of the means for preventing temperature drop to be mounted in the apparatus main body of the dry ice apparatus. FIG. 4 (A) is an external view of the apparatus main body, and FIG. 4 (B). FIG. 4 is a longitudinal sectional view taken along line BB in FIG. 4 (A). FIG. 5 shows an example of a modified arrangement of the dry ice passage, the gas passage, and the heating means of the above-mentioned dry ice apparatus. FIG. 4 (A) is a diagram corresponding to FIG. (B) is a diagram corresponding to FIG. 1 (B) according to Modified Arrangement Example 2. FIG. 6 and 7 show a conventional example, FIG. 6 is a longitudinal sectional view of a dry ice injection device, and FIG. 7 is a piping diagram of the dry ice injection device. BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 1, this dry ice injection device has an apparatus main body 11 in which a gas introduction chamber 1, an orifice valve 2, a gas expansion chamber 3, and a gas diverting section 4 are accommodated in series, and this apparatus main body 1 An injection cylinder 5 provided coaxially in series with 1 and a grip portion 12 for supporting the apparatus main body 11 are assembled so as to form a handgun. Inside the grip portion 12, a gas introduction pipe 14 described later, conductive terminals 40 for heating means 8, and conductive wiring 4 1 · 4 2 and the ground terminal 4 3 are additionally provided. The conductive terminals and conductive wires of the charging means 36 described later are separately provided and arranged.

As shown in FIG. 1, this dry ice injection device causes the liquefied carbon dioxide gas L in the gas introduction chamber 1 to flow out 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 in the gas distribution part 4, and one of the mixed fluids is circulated through the dry ice passage 6 formed in the axis of the injection cylinder 5, The other mixed fluid is allowed to flow through a cylindrical gas passage 7 formed around the dry ice passage 6, and the mixed fluid flowing through the gas passage 7 is heated by a heating means 8 arranged close to the gas passage 7. The deicing prevention gas G is generated, and the dry ice particles D that have been circulated through the dry path 6 are jetted from the tip of the injection cylinder 4 together with the dew condensation preventing gas G.

As shown in FIG. 1, the gas introduction chamber 1 is formed at the center in the front-rear direction of the apparatus main body 11, and the gas introduction chamber 1 is provided inside the grip portion 12 through a communication passage 13. It is in communication with the inlet pipe 14 for liquefied carbon dioxide L contained in the tank. As shown in FIG. 2, the orifice valve 2 has an orifice hole 21 opened in a partition wall 20 between the gas introduction chamber 1 and the gas expansion chamber 3, and is inserted into the orifice hole 21 so as to be able to advance and retreat. A taper-shaped valve stem 22 that opens and closes the orifice hole 21, a valve-closing spring 24 that urges the valve stem 22 toward the valve-closing side via a driven rod 23, and the valve stem described above. 22 Stopper 25 that regulates the retreat position so that the retreat position can be adjusted to set the valve opening amount; and valve opening operating means 26 that opens the valve rod 22 against the valve closing panel 24 to open the valve. It is composed of The valve closing panel 24 includes a flange 15 attached to a rear portion of the driven rod 23 and a panel receiving member 16 screwed to a rear portion of the apparatus main body 11 to constitute panel force setting means. It is constructed so as to be interposed therebetween, and to adjust the valve closing force of the valve closing panel 24 by moving the panel receiving member 16 forward and backward. The stopper 25 is screwed onto the panel receiving member 16 so as to be concentric with the driven rod 23, and the driven rod 23 is retracted. The position is regulated so as to be adjustable, and the valve opening amount of the valve stem 22 is set. Reference numerals 17a and 17b denote fixing screws for fixing the panel holder 16 and the stopper 25, respectively.

The valve opening operation means 26 is integrally formed coaxially with the valve rod 22 and is provided with the driven rod 23 provided so as to be able to advance and retreat, and is provided side by side with the driven rod 23 so as to be able to advance and retreat. A drive rod 27, a pinion 28 engaging with a driven rack 23 a formed on the driven rod 23 and a drive rack 27 a formed on the driven rod 27, and a valve closing panel 2. The orifice valve 2 is opened by the manual operation lever 29 in a moment. In this embodiment, in addition to the valve closing panel 24, an assisting panel 18 for assisting the drive rod 27 to the valve closing side is provided, but this assisting panel 18 may be omitted. .

According to the above configuration, the liquefied carbon dioxide in the gas introduction chamber 1 flows out into the gas expansion chamber 3 via the orifice valve 2 to generate dry ice particles D. The opening degree of the orifice hole 21 opened in the partition wall 20 is measured by inserting the valve stem 22 into the orifice hole 21 so as to be able to adjust the advance / retreat position. That is, the retracted position of the driven rod 23 formed coaxially and integrally with the valve rod 22 and being adjustable so as to be adjustable by the stopper 25 is set to the opening amount of the orifice valve 2. . Then, the desired follow-up rod 23 is piled on the valve-closing panel 24 by the valve-opening operation means 26 and the valve is opened to the position regulated by the stopper 25, thereby instantly fully opening the desired valve-opening amount. can do. That is, since the solenoid on-off valve S unlike the conventional example is not required, it can be implemented at a low cost with a simple configuration. Moreover, by operating the manual operation handle 29 within the range regulated by the stopper 25, the valve opening amount can be appropriately adjusted, which is convenient.

The insertion hole 27 b of the drive rod 27 is closed by a stopper 30, but the stopper 30 receives the rear end of the drive port 27 in a position-adjustable manner and closes the drive hole 27. By killing the valve closing member of the valve panel 24, the orifice hole 21 can be opened by an appropriate amount to allow the mixed fluid to flow through the gas passage 7 by an appropriate amount. In this case, the stopper 30, the drive rod 27, the pinion 28, and the driven rod 23 function as, for example, a means for preventing the heating means 8 from overheating.

As shown in FIG. 1 (A) and FIG. 2 (A), a diverter housing 31 having the diverter 4 is screwed near the tip of the apparatus main body 11, and The branch part 4 is configured by screwing a branch metal fitting 33 into the branch part housing 31 via a predetermined gap downstream of the gas expansion chamber 3. As shown in FIG. 2 (A) and FIG. 2 (B), the branch metal fitting 33 forms a central passage 6 a at the shaft center and three peripheral passages 7 a at the peripheral part. The mixed fluid split by the splitting section 4 is configured to flow through the central passage 6a and the peripheral passage 7a.

By adjusting the gap between the split metal fitting 33 and the gas expansion chamber 3 by adjusting the screw position of the split metal fitting 33, the split ratio between the central passage 6a and the peripheral passage 7a can be reduced. It can be set appropriately. Incidentally, in order to increase the flow rate of the dry ice particles D or to increase the cleaning power by the dry ice particles D, increase the ratio of the flow to the central passage 6a. Also, in order to enhance the shielding performance of the dry ice particles D by the dew condensation preventing gas G, the ratio of the flow to the peripheral passage 7a is increased. As shown in FIG. 1 (A) and FIG. 1 (B), a heating section storage tube 32 is formed coaxially and integrally with the branching section housing 31. Is stored in the injection cylinder 5. A cylindrical guide tube 10 is coaxially mounted in the heating unit housing tube 32, and the guide tube 10 is coaxial with the branch metal fitting 33 as shown in FIG. 2 (A). · Connected in series. In the guide tube 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. . A heater 8 as a heating means is disposed close to the outside of the gas passage 7 inside the heating section housing cylinder 32. I have. As shown in FIGS. 1 (A) and 1 (B), a thermostat 34 is additionally provided in the lower space of the heating unit housing cylinder 32, and the heating by the heater 8 is performed. It is configured to control the temperature constantly.

According to the above configuration, the mixed fluid containing the dry ice particles D is divided into two by the gas distribution part 4, and one of the mixed fluids flows through the dry ice passage 6 formed in the axial center of the injection cylinder 5. 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 disposed in the vicinity to become the dew condensation preventing gas G and flows through the dry ice passage 6. The surroundings of the dried ice particles D are surrounded by the above-mentioned dew-prevention gas G heated 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 workpiece, and the deicing prevention gas G surrounds the periphery of the dry ice particles D so that the dry ice particles D can be removed from the air containing moisture. Isolate and blow off the moist air with heated dew condensation prevention gas G to prevent dew condensation on the workpiece. Also, by keeping the object to be treated warm with the heated dew condensation prevention gas G, dew condensation due to a decrease in the temperature of the object to be treated is prevented.

Further, according to the above configuration, the mixed fluid containing the dry ice particles D in the gas expansion chamber 3 is diverted in the diverter 4, so that the single liquefied carbon dioxide gas L is used to prevent the dry ice particles and dew condensation from occurring. By generating and injecting gas G, it is not necessary to use a nitrogen gas as a dew condensation preventing gas, a nitrogen gas introduction chamber, and a passage for introducing nitrogen gas into the gas expansion chamber as in the conventional example. It can be implemented at low cost. It is desirable to increase the heating efficiency of the gas flowing through the gas passage 7 by increasing the passage wall area of the gas passage 7. For example, the passage may be formed in a spiral shape or a female screw, or the residence time of gas in the passage may be extended.

FIG. 3 shows a main part of the dry ice injection device according to the present invention. FIG. 3 (A) is a longitudinal sectional view of the injection cylinder portion in FIG. 1 (A), and FIG. (A) Charging means in the figure 35 C FIG. 1 is a vertical sectional view taken along line C of FIG. As shown in FIGS. 3 (A) and 3 (B), a charging means 35 is provided near the tip of the injection cylinder 5. The charging means 35 includes one disc-shaped electrode 36 fitted inside the injection cylinder 5, and includes three discharge portions 37 formed on the inner periphery of the electrode 36, and the gas passage 7. It is arranged so as to face the above-described guide cylinder 10 constituting the other electrode so as to face, and for example, is configured to generate a corona discharge by applying a load of about 500 V.

As shown in FIG. 3 (A), the guide cylinder 10 constituting the other electrode is screwed to the shunt container 31 via the shunt bracket 33, and the shunt container 3 The electrode terminal 44 connected to 1 is electrically connected to the electrode terminal 44 via the shunt 33. Note that reference numeral 38 in FIG. 3 (B) denotes an electrode conductor, and 39 denotes an insulator.

According to the above configuration, the one dew condensation preventing gas G that has been diverted is ionized at the outlet side of the gas passage 7. The ionized anti-condensation gas G removes the static charge of the injected dry ice particles D, and increases the flow velocity and charge density. The increased charge density also eliminates static charges generated when the dry ice particles D collide with the target. Further, according to the above configuration, the high-pressure charging means 35 can be housed in the injection cylinder 4 and can be configured safely and compactly.

FIG. 3 (C) is a diagram corresponding to FIG. 3 (B) according to a first modification of the charging means. In the first modification, a large number of discharge units 37 are arranged in opposition to the guide cylinder 10 so as to face the gas passage 7 instead of the three discharge units 37.

FIG. 3 (D) is a diagram corresponding to FIG. 3 (B) according to a second modification of the charging means. In this modified example 2, instead of the plurality of discharge portions 37, a discharge portion 37 having a disk shape in a front view and a blade-like shape in a longitudinal section is arranged facing the guide tube 10 so as to face the gas passage 7. It is. The first and second modifications have the same operation and effects as those of the embodiment shown in FIG. 3 (B).

FIG. 4 shows an example of the arrangement of the temperature drop prevention means and the like mounted in the apparatus main body 11. 4 (A) is an external view of the apparatus main body 11, and FIG. 4 (B) is a vertical cross-sectional view taken along line B-B in FIG. 4 (A). As shown in FIGS. 4 (A) and 4 (B), the main body 11 of the device has a gas chamber opening 9 containing a gas introduction chamber 1, a gas expansion chamber 3, and a gas diverting section 4. A rod mounting hole 19 for mounting the drive rod 27; a pair of left and right heater mounting holes 46 for mounting a heater 45 which is a means for preventing temperature decrease; and a thermostat mounting hole 47. Are formed. The pair of heaters 45 is disposed adjacent to the lower side of the gas chamber enclosure 9 and has a length extending over the gas introduction chamber 1, the gas expansion chamber 3, and the gas branching section 4. (1) Prevents the temperature from dropping to prevent dew condensation on the outer surface, and prevents the adhesion of dry ice to the orifice valve (2) and the icing of trace water contained in carbon dioxide, thereby improving the efficiency of dry ice particle D generation. It is intended to be enhanced.

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 diagram corresponding to FIG. 1 (B) according to Modified Arrangement Example 1, and in this Modified Arrangement Example 1, a dry ice passage 6 and a gas passage 7 are juxtaposed in a heating unit housing tube 32. However, a plurality of heating means 8 are arranged close to the gas passage 7. FIG. 5 (B) is a diagram corresponding to FIG. 1 (B) according to Modified Arrangement Example 2. In Modified Arrangement Example 2, a single dry ice passage 6 The two gas passages 7 are arranged in parallel above and below the dry ice passage 6, and a plurality of heating means 8 are arranged close to each gas passage 7.

Also in the above modified arrangement examples 1 and 2, the mixed fluid containing the dry ice particles is divided into two in the gas distribution section 4, and one of the mixed fluids flows through the dry ice passage 6 while the other is mixed. The 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 disposed in proximity to become the dew condensation preventing gas G, and the dry ice particles D flowing through the dry ice passage 6 are formed. At the same time, the fuel is injected from the tip of the injection cylinder 5. This makes it possible to remove scale and clean the surface of the workpiece with dry ice particles. In addition to performing the cleaning process, the dew condensation preventing gas G is used to prevent dew condensation on the object. It should be noted that 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 that does not change the gist of the present invention.

(1) The heating means 8 only needs to heat the dry ice particles D contained in the mixed fluid flowing through the gas passage 7 to be gasified. A fin or the like that absorbs heat and exchanges heat may be arranged close to the gas passage 7.

(2) The guide tube 10 is not limited to a cylindrical one and may be a polygonal one. 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 DC.

(3) The valve opening operation means 26 may use, for example, an electromagnetic on-off valve in place of the manual operation lever 29 or the like.

Claims

The scope of the claims

1. The liquefied carbon dioxide gas (L) in the gas introduction chamber (1) flows out into the gas expansion chamber (3) through the orifice valve (2) to generate dry ice particles (D), and the dry ice In a dry ice injection device configured to inject particles (D) together with the dew condensation gas (G) from the tip of the injection cylinder (5),

Downstream of the gas expansion chamber (3), a gas branching section (4) is provided on the base end side of the injection cylinder (5),

A dry ice passage (6) and a gas passage (7) are defined in the injection cylinder (5), and a heating means (8) is arranged close to the gas passage (7).

The mixed fluid of the dry ice particles (D) and the carbon dioxide gas in the gas expansion chamber (3) is diverted in the diverter (4), and the dry ice particles (D) are diverted to 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 injection device.

2. In the dry ice injection device described in claim 1,

A dry ice injection device characterized in that a temperature lowering prevention means (45) is arranged in close proximity to the gas introduction chamber (1), the gas expansion chamber (3), and the gas branching section (4).

3. The dry ice injection device according to claim 1 or 2, wherein a guide cylinder (10) is mounted in the injection cylinder (5), and the guide cylinder (10) is mounted in the guide cylinder (10). A dry ice passage (6) is formed, and the gas passage (7) is formed around the guide tube (10).

A charging means (35) is attached to the injection cylinder (5),

The charging means (35) includes one plate-like electrode (36) fitted inside the injection cylinder (5), and includes a discharge unit (37) formed on an inner peripheral portion of the electrode (36). It faces the above-mentioned guide tube (10) which constitutes the other electrode so as to face the above-mentioned gas passage (7). A dry ice injection device, characterized in that:

4. The liquefied carbon dioxide (L) in the gas introduction chamber (1) is discharged into the gas expansion chamber (3) through the orifice valve (2) to generate dry ice particles (D), and the dry ice In a dry ice injection device configured to inject particles (D) from the tip of the injection cylinder (5),

The orifice valve (2) is moved into and out of the orifice hole (2 1) opened in the partition (20) between the gas introduction chamber (1) and the gas expansion chamber (3), and the orifice hole (2 1). A valve stem (22) that is inserted as much as possible to open and close the orifice hole (2 1) in a meterable manner, a valve closing panel (24) that urges the valve stem (22) toward the valve closing side, Stopper (25) that regulates the retreat position of the rod (22) so that it can be adjusted to set the valve opening amount, and valve opening that operates by opening the valve rod (22) to the valve closing panel (24) A dry ice injection device characterized by comprising an operating means (26).

5. In the dry ice injection device described in claim 4,

The valve opening operating means (26) is coaxially and integrally formed with the valve rod (22), and is arranged side by side with the driven rod (23) provided so as to be able to advance and retreat. , A pinion that engages with a driven rack (23a) formed on the driven rod (23) and a driven rack (27a) formed on the driven rod (27). (28) and a manual operation lever (29) for adjusting and retracting the drive rod (27) in a dry ice injection device.

6. In the dry ice injection device described in claim 4,

Panel force setting means (16) for setting the valve closing force of the valve closing panel (24) to be adjustable is provided, and the driven rod (23) is located in the gas introduction chamber (1). A pressure receiving step (23 b) is formed to urge the driven rod (23) toward the valve opening side by gas pressure, A dry ice injection device characterized in that the valve closing force of the valve closing panel (24) and the valve opening force of the gas pressure are antagonized so that the valve (2) functions as a safety valve. .