JP4891653B2 - Dry ice gas transfer mechanism and dry ice jetting device - Google Patents

Description

  The present invention relates to a dry ice gas transport mechanism and a dry ice jetting apparatus. For example, the present invention relates to a dry ice gas transport mechanism and a dry ice jetting apparatus that can be suitably used in a shot material blasting apparatus that uses particulate dry ice as a shot material.

Conventionally, for example, a blasting apparatus using dry ice as a shot material is known as a dry ice spraying apparatus for spraying particulate dry ice.
Such a blasting device conveys particulate dry ice stored in a hopper with a gas flow mechanism such as air using a compressor or a blower, and guides it to an injection nozzle. For example, the product is injected at a pressure of about 0.294 MPa to about 1.47 MPa (3 kgf / cm ^{2 to} 15 kgf / cm ² ). Then, for example, the paint is peeled off, the material surface is polished, the mold release material is removed, the industrial product or the semiconductor product is washed, and the like.
For example, Patent Document 1 discloses a hopper, an air compressor having an outlet pressure of 0.12 MPa to 0.25 MPa (1.2 atm to 2.5 atm), and an air conveyance that guides the compressed air flow to a nozzle. A drive last device is described that includes a path and dry ice particle supply means for mixing dry ice particles into the air stream.
JP 2002-79465 A (FIG. 1)

However, the conventional dry ice gas transport mechanism and the dry ice jetting apparatus as described above have the following problems.
In these dry ice jetting devices, when dry ice is mixed with a gas such as air, the moisture in the gas condenses and freezes, and the dry ice adheres to each other and forms a lump, or the condensed water is a gas. In other words, it is sprayed from the nozzle together with the water, and water adheres to the object to be processed, and good blasting performance and cleaning performance cannot be obtained. Moreover, when condensed water adheres to the front-end | tip of an injection nozzle, there exists a problem that an injection hole will obstruct | occlude. When air is used as a gas for mixing dry ice, the tendency increases from the hot and humid rainy season to the summer season, so it is necessary to sufficiently remove moisture in the air.
It is conceivable to provide a moisture removal filter as a means for removing moisture from the gas. However, since the pressure loss becomes too large, there is a problem that the blast performance, the cleaning ability, and the like are lowered due to a lower injection pressure. In particular, when a compressed gas is used by using a blower or the like instead of a compressor in order to obtain a compact and portable device, the influence of pressure loss is large.
Although it is conceivable to provide a dryer in the flow path of the compressed gas, since the dryer is expensive, there is a problem that it becomes an expensive device.

  The present invention has been made in view of the problems as described above, and reduces moisture in the gas carrying particulate dry ice with a simple configuration and accompanies the mixed flow of gas and dry ice. An object of the present invention is to provide a dry ice gas transport mechanism and a dry ice jetting apparatus capable of removing condensed water.

In order to solve the above-mentioned problem, in the invention according to claim 1, a hopper for storing particulate dry ice, a gas flow forming part for forming a gas flow for conveying the dry ice, and the gas flow forming A dry ice supply mechanism having a dry ice supply unit for supplying dry ice in the hopper to a gas flow path from the unit, wherein the hopper uses a gas for forming the gas flow as the dry ice Condensed water collection for collecting condensed water in the gas in a gas flow path between the heat exchange flow path and the gas flow forming unit It is set as the structure provided with a vessel.
According to this invention, by flowing the gas through the heat exchange flow path, the gas is cooled by exchanging heat with dry ice, and the moisture contained in the gas is condensed. And by collecting the condensed water with a condensate collector, it is supplied to the gas flow forming part in a state where moisture in the gas is removed, mixed with dry ice supplied from the dry ice supply part, and gas Carry with.
Therefore, the hopper that removes dry ice condenses and collects moisture in the gas and has a simple structure that also serves as a cold heat source, causing pressure loss, such as when using a moisture removal filter, For example, without using an expensive device such as a dryer, gas can be transported in a state where condensate is prevented from being accompanied.

According to a second aspect of the present invention, in the dry ice gas transfer mechanism according to the first aspect, the heat exchange channel is a partition plate erected outward from the outer peripheral surface of the hopper main body, and the hopper main body And a cover member that covers the hopper body.
According to the present invention, the heat exchanger channel is formed by covering the partition plate erected outward from the outer peripheral surface of the hopper body from the outer peripheral side by the cover member. Heat exchange can be performed.

According to a third aspect of the present invention, in the dry ice gas transfer mechanism according to the first aspect, the heat exchange flow path is formed by a tube member wound around the outer peripheral surface of the hopper body.
According to the present invention, since the heat exchange flow path is formed by winding the tube member around the outer peripheral surface of the hopper body, it is possible to easily form the flow path in which the gas circulates around the outer peripheral surface of the hopper main body. Moreover, the setting of the flow path length can be easily changed by changing the length of the tube member as required.

According to a fourth aspect of the present invention, in the dry ice transport mechanism according to any one of the first to third aspects, the dry ice stores a part of the gas from which condensed water has been removed by the condensed water collector. It is set as the structure provided with the pipe line which sends out inside the made hopper.
According to this invention, the inside of the hopper can be pressurized without fear of adhering dry ice to each other by sending the gas from which the condensed water has been removed by the condensed water collector through the pipe line to the inside of the hopper. Dry ice can be supplied in a stable state. Moreover, since the gas to be delivered is cooled by heat exchange with dry ice, the weight loss due to sublimation of dry ice can be reduced.

According to a fifth aspect of the present invention, in the dry ice injection device, the dry ice gas transport mechanism according to any one of the first to fourth aspects and the dry ice supplied from the dry ice supply unit of the gas transport mechanism An injection nozzle unit that injects together with the pressurized gas generated by the gas flow forming unit of the gas transport mechanism.
According to this invention, since the dry ice gas transport mechanism according to any one of claims 1 to 4 is provided, the same effects as the invention according to any one of claims 1 to 4 are provided.
And since dry ice mixed with gas without condensate can be injected from the injection nozzle part, the injection nozzle part is not clogged with condensed water, and condensed water is injected into the injection target. Can be prevented from adhering to and adversely affecting.

According to a sixth aspect of the present invention, in the dry ice jetting apparatus according to the fifth aspect, the particulate dry ice is a shot material for performing dry ice blasting.
According to this invention, since granular dry ice is a shot material for performing dry ice blasting, it is possible to perform blasting by injecting shot material in a state in which no condensed water accompanies, so that condensed water adheres. Good blasting can be performed without being adversely affected by

  According to the dry ice gas transport mechanism and the dry ice injection device of the present invention, the hopper also serves as a cold heat source for condensing and collecting moisture in the gas, thereby transporting the particulate dry ice with a simple configuration. It is possible to reduce the moisture in the gas to be removed and to remove the condensed water accompanying the mixed flow of gas and dry ice.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
A dry ice gas transport mechanism and a dry ice jetting apparatus according to an embodiment of the present invention will be described.
FIG. 1 is an apparatus configuration diagram schematically showing a schematic configuration of a dry ice jetting apparatus according to an embodiment of the present invention. 2 (a) and 2 (b) are a partial cross-sectional view and a plan view of a hopper of the dry ice spraying apparatus according to the embodiment of the present invention as viewed from the front.

As shown in FIG. 1, the dry ice spray device 100 of the present embodiment is a device that sprays particulate dry ice 2 formed in an appropriate size together with compressed air. Can be suitably used as a dry ice blasting apparatus that sprays the material as a shot material onto the object to be processed and performs blasting, cleaning, etc. of the object to be processed.
The particle size of the dry ice 2, the flow velocity of the dry ice mixed air flow, the injection pressure, and the like are appropriately set depending on the type of processing and the processing target. For example, the dry ice 2 generally has a diameter of 3 mm and a length of about 3 mm to 7 mm. Examples of the types of treatment include peeling of paint, polishing of the material surface, removal of a mold release material, and washing of industrial products and semiconductor products.

  The schematic configuration of the dry ice injection device 100 includes a hopper 1, a feeder 5 (dry ice supply unit), a condensed water collector 8, a blower 10 (gas flow formation unit), a plurality of injection nozzle units 12, and a plurality of them. Consists of pipelines. In the dry ice jetting apparatus 100, the configuration excluding the jet nozzle unit 12 constitutes a dry ice gas transport mechanism according to the embodiment of the present invention.

  The hopper 1 stores the dry ice 2 so as to be lowered, and supplies the dry ice 2 to the feeder 5 through the lower dry ice discharge pipe 1f. As shown in FIGS. 1 and 2, the schematic configuration includes a hopper body 1a, a partition plate 1b, a cover 1c (cover member), and a hopper lid 1d.

The hopper body 1a is made of a metal cylindrical body composed of a cylinder that opens upward and a conical surface that is reduced in diameter from its lower end and has an opening 1g at its end.
The partition plate 1b is a metal plate-like member that is erected by extending radially outward on the outer peripheral surface of the hopper main body 1a by an equal distance and is continuously provided along the outer peripheral surface of the hopper main body 1a. This is a regulating plate that regulates the flow path of air A ₀ (gas) supplied to the outer peripheral side of the hopper body 1a. In the present embodiment, a U-shaped groove is formed by a partition plate that circulates around the hopper body 1a in a spiral, a part of the body, and the partition plate.
The partition plate 1b may be partly integrated with the outer peripheral surface of the hopper body 1a by spot welding or the like, for example, but is integrated by a method such as brazing, and air _A0 is generated during spot welding. It is desirable not to leak from the clearance between the hopper body 1a and the partition plate 1b.
In addition, it is preferable that the metal material used for the hopper main body 1a and the partition plate 1b is a metal with high thermal conductivity, for example, it is preferable to use metals, such as stainless steel and aluminum.

  The cover 1c is integrated with the hopper main body 1a at the upper and lower ends, and is in contact with the radial front ends of the partition plate 1b without any gaps to cover the hopper main body 1a and the partition plate 1b entirely on the outer peripheral side in the radial direction. It is. Therefore, the U-shaped groove formed by the partition plate 1b and the hopper main body 1a is covered from the outer peripheral side by the cover 1c, and the flow path P having a rectangular cross section that spirals around the hopper main body 1a is formed.

The cover 1c is manufactured as a container-like member whose diameter is increased by the protruding height dimension of the partition plate 1b from the shape of the hopper body 1a for easy assembly, and the partition plate 1b is erected. It is preferable to cover the hopper main body 1a by covering it from below and fix the cover 1c with the inner surface of the cover 1c and the tip of the partition plate 1b in contact with each other without any gap. For example, by providing an elastic member on the end surface of the partition plate 1b and providing a packing function with the cover 1c, the partition plate 1b can be in contact with no gap.
The cover 1c can be made of metal or the like. However, in order to reduce the temperature rise in the flow path P due to heat transfer from the outside air, a highly heat insulating material is used, or the outer surface is made of a heat insulating material. It may be covered.

The flow path P having such a configuration is used as a heat exchange flow path for exchanging heat with air that forms compressed gas for injecting the dry ice 2 with the dry ice 2. The size of the cross-sectional area of the flow path P, that is, the vertical spacing and radial length of the partition plate 1b depends on the cooling heat transfer area for cooling the air A flowing through the flow path P and the air flow velocity. Is set.
An air inlet 3 for supplying air A ₀ to the flow path P is provided on the upper end side of the cover 1c. Air will naturally enter from the air inlet 3 by the compression function of the blower 10.
The lower side of the cover 1c, the air outlet port 4 for discharging the air A ₁ which is cooled by dry ice 2 and the heat exchanger by circulating the flow passage P to the outside of the flow path P is provided.

The hopper lid 1d is a lid member that covers the opening on the upper end side of the hopper body 1a so as to be openable and closable. When the hopper body 1a is sealed with the hopper lid 1d, a pressurized air supply port 1e is provided at an appropriate position of the hopper lid 1d in order to pressurize the inside of the hopper body 1a.
The pressurized air supply port 1e, is connected via line 9B to be described later, dry pressurized air A ₃ is adapted to be supplied. Thereby, for example, the dry ice 2 in the hopper body 1a is integrated with each other, the dry ice 2 is prevented from rising, and the dry ice 2 is stably lowered along the inner surface of the hopper body 1a. As a result, the dry ice 2 can be supplied to the feeder 5 in a stable state.

  The feeder 5 is a mechanism that obtains an appropriate amount of dry ice 2 to be sent downward from the dry ice discharge pipe 1f and supplies the dry ice 2 to a pipe 6 provided below. The supply timing may be continuous or intermittent as required. Further, as the specific supply mechanism, various known mechanisms such as a rotary mechanism such as a rotary feeder or a supply mechanism based on a reciprocating operation can be adopted as necessary.

A pipe 7 is connected to the air outlet 4, and a condensed water collector 8 is installed at the end thereof.
Condensed water collector 8 is for discharging by collecting condensate of the cooled air A ₁ by heat exchange with dry ice 2 passes through the flow path P outside the conduit.
A conduit 9 is connected to the outlet side of the condensed water collector 8.
The conduit 9 is a conduit for supplying the blower 10 with the air A ₂ that has been collected and dried by the condensed water collector 8.

The blower 10 is for accelerating the air A ₂ supplied from the pipe 9 and sending it to the pipe 11 as the carrier air A ₄ (the gas flow to be carried).
The blower 10 may employ a mechanism other than the blower as long as it can form a gas flow for transporting the dry ice 2. For example, various types of compressors may be used.

The pipe 11 is connected to the pipe 6 at an intermediate part, and a mixing part 11 a for mixing the carrier air A ₄ and the dry ice 2 supplied by the feeder 5 is formed. Then, the end of the channel, the injection nozzle 12 for injecting a dry ice mixture air flow B is a mixture of transport air A ₄ and the dry ice 2 to the outside is connected.
Further, on line 11A between the mixing portion 11a and the blower 10, the air condensed water is dried is removed by condensate collector 8, as pressurizing air A _3, pressurized air supply port A pipe 13 for supplying to 1e is provided. Note that, although not particularly shown, a pressure adjusting means for adjusting the air pressure of the pipe line 13 to an appropriate value is provided at a portion branched from the pipe line 11A of the pipe line 13A.

Next, operation | movement of the dry ice injection apparatus 100 of this embodiment is demonstrated.
First, air A ₀ having the same temperature and humidity conditions as indoor air is supplied from the air inlet 3. And it becomes the air A which forms the flow which goes around the outer peripheral surface of the hopper main body 1a along the flow path P spirally. Since the air A is heat-exchanged with the dry ice 2 using the hopper body 1a and the partition plate 1b as the heat transfer path, the air A travels through the flow path P while being cooled. Here, the partition plate 1b functions as a radiating fin, and efficient heat exchange of the air A is possible.
For this reason, when discharged from the air outlet 4, the temperature drops according to the length of the flow path P, and the air A _{1 in} a state where moisture in the air A ₀ is condensed according to the saturated water vapor amount at that temperature. As discharged. The air A ₁ is guided to the condensed water collector 8 through the pipe line 7.

In the condensed water collector 8, condensed water is collected from the air A ₁ and conveyed by the conduit 9.
Air _{A 2} guided to conduit 9 are accelerated by the blower 10, as conveying air _{A 4,} is sent to the conduit 11A.
A part of the conveying air A ₄ is pressurized as pressure air A ₃ is branched into the conduit 13, it enters into the hopper main body 1a from the pressurized air supply port 1e, pressurizing the inside of the hopper main body 1a. As a result, when the dry ice 2 is supplied to the feeder 5 and the amount of the dry ice 2 is reduced, the amount of the dry ice 2 on the upper side is smoothly lowered downward.
Further, even flow partially ring dry ice discharge line 1f conveying air A ₄ from, it is possible to reduce the influence, it is possible to prevent, for example, problems such as dry ice 2 in the hopper main body 1a soar, dry It becomes possible to stably supply ice 2 in a fixed amount.
Further, since the carrier air A ₄ is air in which condensed water has already been collected and moisture has been reduced, even if the air is introduced into the low-temperature hopper body 1 a, It can be prevented from bonding or agglomerating. Therefore, the dry ice 2 can be stably supplied to the lower side.

On the other hand, the dry ice 2 stored in the hopper main body 1a is supplied to the pipeline 6 by the feeder 5 by a certain amount at an appropriate timing. Then, in the mixing portion 11a, it is mixed with the conveying air A ₄ delivered to the conduit 11A, as dry ice mixture air stream B, is conveyed through the conduit 11B, is injected to the outside by the injection nozzle unit 12.
At this time, the transport air A _4, since water is the air that has been reduced, the dry ice mixture air flow B, without condensed water is mixed, for example, water is frozen in the injection nozzle portion 12 Stable injection can be performed without clogging.
In addition, even when sprayed on the object to be processed, the dry ice mixed air stream B is not accompanied by condensed water, so that moisture does not adhere to the object to be processed and the processing performance is not adversely affected. Processing can be performed. Accordingly, it is possible to reduce the defect rate of the object to be processed, improve productivity, and omit post-processing steps for removing adverse effects.

Thus, according to the dry ice injection device 100 of the present embodiment, the air A ₀ that forms the carrier air A ₄ for injecting the dry ice 2 flows from the air inlet 3 to the air outlet 4. P is cooled by exchanging heat with the dry ice 2 and the condensed water is collected by the condensed water collector 8 to remove the condensed water from the air A ₁ before being compressed, the subsequent transport air a ₄ may be air moisture is reduced.
In this case, since the dry ice 2 can also serve as a cooling heat source for removing condensed water, the apparatus can be simplified as compared with a case where a heat source for dehumidification is provided.
In addition, since a means for generating pressure loss such as a moisture removal filter is not used, a configuration including a low-pressure gas flow forming section can be provided, so that an inexpensive and compact apparatus can be obtained.
In addition, for example, an inexpensive configuration can be achieved as compared with a case where a dryer or the like is used.

Next, a first modification of the present embodiment will be described.
FIGS. 3A and 3B are a partial cross-sectional view and a plan view, as viewed from the front, of a hopper of a dry ice spray device according to a first modification of the embodiment of the present invention.

In this modification, a hopper 1A shown in FIGS. 3A and 3B is used in place of the hopper 1 of the dry ice spray device 100. FIG. Hereinafter, a description will be given focusing on differences from the above embodiment.
In the hopper 1A, instead of the partition plate 1b of the hopper 1, a plurality of C-shaped partition plates 20 (partition plates) are erected in parallel at an appropriate pitch on the outer peripheral surface of the hopper body 1a. The outer diameter of the C-shaped partition plate 20 is set to a height that is inscribed in the cover 1c without a gap, like the partition plate 1b.
As shown in FIG. 3 (b), the C-shaped partition plate 20 is a metal flat plate having a C-shape in plan view, which has at least one opening 21 in the circumferential direction and circumscribes the outer peripheral surface of the hopper body 1a. Yes, like the partition plate 1b, it is fixed to the hopper body 1a by welding or the like.
In this modification, the opening 21 of each C-shaped partition plate 20 is disposed at a position where the C-shaped partition plates 20 adjacent in the vertical direction do not overlap. In the present modification, air A ₀ is alternately provided at two locations facing each other in the radial direction in plan view so that the air A ₀ can circulate around the outer peripheral surface of the hopper body 1a evenly and evenly. However, the positional relationship of the openings 21 is not limited to this, and any positional relationship may be used as long as a flow path necessary for heat exchange can be formed.

In this modified example, a plurality of annular flow paths having a rectangular cross section including the outer peripheral surface of the hopper main body 1a, the C-shaped partition plates 20 and 20, and the cover 1c are stacked in the vertical direction of the hopper main body 1a. Each communicates vertically through the opening 21. For this reason, the air introduction port 3 circulates around the outer periphery of the hopper main body 1 a, transitions to the lower annular flow path through each opening 21, and sequentially repeats this circulation and lowering to the air outlet port 4. flow path P _A is formed throughout. Therefore, the flow path P _A is a heat exchange flow path in which the air A ₀ flows along the entire outer peripheral surface of the hopper body 1 a and exchanges heat between the hopper body 1 a and the C-shaped partition plate 20.

According to this configuration, the air A ₀ supplied from the air inlet 3 flows through the flow channel P _A, is dry ice 2 and the heat exchanger, the same effects as the above embodiment.
The C-shaped partition plate 20 of the present modification is easy to manufacture because the partition plate 1b of the above embodiment has a spiral three-dimensional shape and is composed of a plurality of flat plate members.

Next, a second modification of the present embodiment will be described.
FIGS. 4A and 4B are a partial cross-sectional view and a plan view, respectively, of a hopper of a dry ice spray device according to a second modification of the embodiment of the present invention.

In this modification, a hopper 1B shown in FIGS. 4A and 4B is used in place of the hopper 1 of the dry ice spray device 100. FIG. Hereinafter, a description will be given focusing on differences from the above embodiment.
The hopper 1B is provided with tubes 22 wound around the outer peripheral surface of the hopper main body 1a instead of the partition plate 1b of the hopper 1 and having both ends connected to the air inlet 3 and the air outlet 4, respectively. . The flow path P _B formed inside the tube 22, the air flowing inside, to form a heat exchange passage for heat exchange between the dry ice 2 in the hopper body 1a.
The cross-sectional shape of the tube 22 can be an appropriate shape such as a circular shape, an elliptical shape, a D shape, a rectangular shape, or an indefinite shape, but a gap is not easily formed between the outer peripheral surface of the hopper body 1a. The shape is preferable in order to improve the efficiency of heat exchange.
The material of the tube 22 can be an appropriate material as long as the necessary thermal conductivity is obtained, but a metal having good thermal conductivity, for example, aluminum is preferable. Further, a synthetic resin or rubber having elasticity even at a low temperature of dry ice may be used.

Note that the tube holding member 23 (see FIG. 4A) is a plate-like projecting radially outward from the outer peripheral surface of the hopper body 1a so that the tube 22 can be stably held in the vertical direction. Or it is a rod-shaped member. In this modified example, the plate-like or bar-like member is provided, for example, every three turns, but may be provided every turn or not at all as required.
Further, unlike the above embodiment and the first modification, the cover 1c according to the present modification does not have a function of forming a flow path, and covers the tube 22 from the outer peripheral side to protect it mechanically or from the outside. It has only the function of suppressing the inflow. Therefore, the space | gap 24 may be formed between the tube 22 and the cover 1c (refer Fig.4 (a)).
Further, the cover 1c may adopt a form such as a form covering a part of the tube 22 or a mesh as necessary. Further, when there is no need, it may be deleted.

According to this modification, the spiral flow path P _B can be formed very easily by the tube 22. Moreover, since the length of the heat exchange flow path can be adjusted only by the length of the tube 22 as required for the cooling capacity, an efficient apparatus can be easily manufactured.

In the above description, the dry ice injection device 100 has been described as an example in which the dry ice mixed air flow B is formed in the mixing unit 11a and then injected by the injection nozzle unit 12, but the configuration is limited to such a configuration. Is not to be done.
For example, a system for transporting the dry ice 2 and a system for the transport air A ₄ dried by the condensate collector 8 are connected to the injection nozzle unit 12 as separate systems, respectively, and the ejector effect of the transport air A ₄ is used. A dry ice spraying device having a structure in which the dry ice 2 is sucked and sprayed from a conduit for supplying the dry ice 2 may be used.

The plate in the above description, the partition plate 1b, and C-type partition plate 20, the passage P, has been described in the example was used to form a conduit wall P _A, which is erected on the hopper main body 1a the Jo member, the flow path P, may be provided independently inside the P _a. In this case, since the plate-shaped member acts as a fin for heat exchange, the efficiency of heat exchange can be improved.

  In the above description, the air introduction port 3 is provided on the upper side of the hopper 1 and the air outlet port 4 is provided on the lower side of the hopper 1. However, this vertical relationship may be reversed. However, since the dry ice 2 in the hopper 1 descends as conveyance and injection progress, it is preferable that the heat exchange flow path be formed on the lower end side of the hopper 1. Therefore, it is preferable to provide either the air inlet 3 or the air outlet 4 on the lower end side of the hopper 1.

  In the above description, the dry ice gas transport mechanism is described as an example of transporting dry ice with transport air, but the gas transporting dry ice is not limited to air, for example, nitrogen, carbon dioxide, A gas other than air, such as an inert gas, may be used.

In the above description, the dry ice gas transport mechanism has been described as an example using a part of the dry ice spraying device. However, in all applications for transporting particulate dry ice with gas, as a single mechanism, Or it can be used as part of another device.
For example, it can be used as a dry ice transport device for transporting particulate dry ice without accompanying condensate water in the production process and packing process of particulate dry ice.

  In the above description, an example of a dry ice blasting device has been described as an example of a dry ice spraying device. However, the dry ice spraying device has an adverse effect on moisture, for example, by spraying particulate dry ice. It may be a cooling device or the like for cooling an object to be given.

In the above description, by providing a conduit 9B, although the pressurizing air A _3, which is dried in the condensed water collecting device 8 described in the example where the structure back to the hopper 1, pressurizing the interior of the hopper 1 In the case where it is not necessary, a configuration in which such a pipe line is not provided may be employed.

  In the above description, the heat exchange flow path has been described as an example provided along the outer peripheral surface of the hopper body. However, if heat exchange can be performed without any problem in the supply of dry ice, the heat exchange flow path is It may be provided inside.

  Moreover, each component demonstrated above can be implemented in combination as appropriate within the scope of the technical idea of the present invention, if technically possible. For example, the heat exchange flow path may be formed by combining the partition plate 1b, the C-shaped partition plate 20, and the tube 22.

Next, an example of the dry ice jet device 100 will be briefly described together with a comparative example according to the related art.
FIG. 5 is a graph for explaining the temporal change in the amount of water accompanying the condensed water collecting operation of the dry ice jetting apparatus according to the embodiment of the present invention. The abscissa represents the passage of time (minutes), and the ordinate represents temperature (° C.), relative humidity (%), and water content (g / m ³ ), and each numerical scale is common.

In the dry ice spraying apparatus 100 of the present example, the hopper 1 of the above embodiment was made of stainless steel. The length of the flow path P is about 5 m, the diameter of the air inlet 3 and the air outlet 4 is 20 A (outer diameter 7.2 mm), and the outer surface area of the hopper body 1 a is 0.427 m ² .
The dry ice injection device of the comparative example (hereinafter referred to as the device of the comparative example) has the hopper removed from the hopper 1 of the dry ice injection device 100 by removing the cover 1c and the partition plate 1b, and the hopper body 1a and the hopper lid 1d. The condensate collector 8 and the pipeline 9B are further removed.
In the present embodiment and the comparative example, the blower 10 is configured to inject air at 1.5 to 2 m ³ / min.
The ambient temperature and relative humidity of the environment where the dry ice jet apparatus 100 and the apparatus of the comparative example are arranged are 30 ° C. and 55%, respectively, and the moisture amount per unit volume of the air A ₀ supplied to the air inlet 3 is 16.0 g / m ³ .
Then, 6.0 kg of dry ice 2 is put into the hopper 1 of the dry ice jet device 100, the temperature of the air on the outlet side of the condensed water collector 8, the relative humidity, and the temperature at the tip of the jet nozzle unit 12, Relative humidity was measured. Further, the amount of condensed water collected by the condensed water collector 8 was measured.
In the apparatus of the comparative example, 6.0 kg of dry ice 2 was similarly charged into the hopper, and the temperature and relative humidity at the tip of the injection nozzle unit 12 were measured.
Table 1 below shows the atmospheric conditions and the measurement results of temperature and humidity in the examples and comparative examples.

In FIG. 5, the temperature at the outlet of the condensate collector 8 of the dry ice spray device 100 is indicated by a curve 200, and the relative humidity is also indicated by a curve 201. In the air converted from these measured values and the saturated water vapor amount, The water content is indicated by a curve 202.
First, when the hopper 1 was empty, the dry ice 2 was charged, and the operation of the blower 10 was started from the time when the charging was completed (time of 2 minutes in FIG. 5). Then, the air A ₂ supplied to the blower 10 is sucked from the air inlet 3 and flows through the flow path P, so that heat exchange with the dry ice 2 is performed and the air is cooled, so that the temperature of the carrier air A ₄ also decreases. Go.
Then, after 1 minute (at the time point of 3 minutes in FIG. 5), it is cooled to about 5 ° C., and after that, it is moving toward an equilibrium temperature of about 3 ° C. with slight fluctuation in the vicinity of 3 ° C. Along with this, as indicated by a curve 201, the relative humidity increases, and reaches 3% after 3 minutes (at 5 minutes in FIG. 5).
When the temperature of the air of the condensed water collector 8 was 3 ° C., as shown in Table 1, the amount of condensed water collected by the condensed water collector 8 was 10.1 g / m ³ . Saturated moisture content of the initial air is 16.0 g / ^{m 3,} the saturated water vapor content of 3 ° C. is because it is 5.9 g / ^{m 3,} condensed water in the air _{A 2} by condensed water collector 8 It can be seen that 100% was collected (10.1 = 16-5.9).
Therefore, the moisture content of the carrier air A ₄ is 5.9 g / m ³ .

On the other hand, the temperature of the front end portion of the injection nozzle portion 12 is 5 ° C. as shown in Table 1 by mixing the dry ice 2 and exchanging heat with the outside via the pipe line. Since the saturated water vapor amount at 5 ° C. is 6.8 g / m ³ , the amount of condensed water in the dry ice mixed air stream B is 0 g / m ³ . That is, it turns out that condensed water is not accompanied.
In this embodiment, as shown by a curve 202 in FIG. 5, the amount of water at the outlet of the condensate collector 8 decreases rapidly from the time point of 2 minutes, and after the time point of about 2 minutes and 30 seconds. , Less than 6.8 g / m ³ , and the condensed water is not accompanied at the tip of the injection nozzle portion 12.

On the other hand, in the apparatus of the comparative example, the temperature of the air compressed by the blower 10 is lower than that of the present embodiment, but by mixing with the dry ice 2, it becomes 5 ° C. as shown in Table 1. Yes. Therefore, the amount of water that can be held as water vapor is 6.8 g / m ³ , and 9.2 g / m ³ (= 16.0-6.8) is accompanied by a dry ice mixed air stream as condensed water. Thus, the fuel is ejected from the ejection nozzle portion 12. In this example, the flow rate is so 1.5m ³ / min~2m ³ / min, the amount of condensed water will 14g / min~18g / min.

It is an apparatus block diagram which shows typically schematic structure of the dry ice injection apparatus which concerns on embodiment of this invention. It is the fragmentary sectional view of the front view of the hopper of the dry ice injection apparatus which concerns on embodiment of this invention, and a top view. It is the fragmentary sectional view of the front view of the hopper of the dry ice injection apparatus which concerns on the 1st modification of embodiment of this invention, and a top view. It is the fragmentary sectional view of the front view of the hopper of the dry ice injection apparatus which concerns on the 2nd modification of embodiment of this invention, and a top view. It is a graph explaining the time-dependent change of the moisture content accompanying the condensed water collection operation | movement of the dry ice injection apparatus of the Example of this invention.

Explanation of symbols

1, 1A, 1B Hopper 1a Hopper body 1b Partition plate 1c Cover (cover member)
1e Pressurized air supply port 1f Dry ice discharge pipe 2 Dry ice 3 Air inlet 4 Air outlet 5 Feeder (dry ice supply unit)
6, 7, 9, 11, 11B, 13 Pipe line 8 Condensate collector 10 Blower (gas flow forming part)
11a Mixing part 11A Pipe line (gas flow path)
12 Injection nozzle part 20 C type partition plate (partition plate)
21 Opening 22 Tube 100 Dry Ice Injecting Device A, A ₁ , A ₂ Air (Gas)
A ₃ Pressurization air A ₄ Carrying air (carrying gas flow)
B Dry ice mixed air flow P, P _A , P _B flow path (heat exchange flow path)

Claims (6)

A hopper for storing particulate dry ice, a gas flow forming unit for forming a gas flow for conveying the dry ice, and a dry ice for supplying dry ice in the hopper to a gas flow path from the gas flow forming unit A dry ice gas transport mechanism having a supply unit,
The hopper includes a heat exchange flow path for allowing a gas for forming the gas flow to flow through the dry ice in a heat exchangeable manner,
A dry ice gas transport mechanism comprising a condensed water collector for collecting condensed water in the gas in a gas flow path between the heat exchange flow path and the gas flow forming section.   The heat exchange channel is formed by a partition plate erected outward from an outer peripheral surface of the hopper body, an outer peripheral surface of the hopper body, and a cover member that covers the hopper body. Item 2. A dry ice gas transfer mechanism according to Item 1.   2. The dry ice gas transfer mechanism according to claim 1, wherein the heat exchange flow path is formed by a tube member wound around an outer peripheral surface of a hopper body.   4. The pipe according to claim 1, further comprising a pipe for sending a part of the gas from which condensed water is removed by the condensed water collector to the inside of a hopper in which the dry ice is stored. Dry ice gas transfer mechanism. A gas transport mechanism for dry ice according to any one of claims 1 to 4,
An apparatus for spraying dry ice, comprising: an injection nozzle that injects dry ice supplied from a dry ice supply unit of the gas transfer mechanism together with a pressurized gas generated by a gas flow forming unit of the gas transfer mechanism.   6. The dry ice jetting apparatus according to claim 5, wherein the particulate dry ice is a shot material for performing dry ice blasting.

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