JPS62208872A - Fine frosen grain housing equipment - Google Patents

Abstract

PURPOSE:To make fine frosen grains very easily takeable out of a vessel, by maintaining these fine frosen grains inside the vessel in a fluidic state by dint of spouting force of cold gas, in case of fine frozen grain housing equipment for blast use. CONSTITUTION:A temperature controlling device 3 detects a temperature of cold gas 12a flowing into a vessel 1 from an intake pipe 14 with a detector 16, controls a flow rate of drive gas flowing into a heat exchanger 15 from a flow control valve 19, and keeps it within the specified temperature range. And, this cold gas 12a is made to be spouted out of an exhaust nozzle 11 of a partition plate 4 of the vessel 1, thereby forming a fluid layer 7 of fine frosen grains 7a. On the other hand, the drive gas cooled by heat exchange with the cold gas 12a is fed to a blast gun 10, and spouted out of this blast gun 10 as preventing a temperature rise in these fine frosen grains 7a from occurring. Thus, an ice blast is effectively and smoothly performable.

Description

[Detailed Description of the Invention] (Field of Industrial Application) In recent years, micro-frozen grains such as fine ice grains produced by heat exchange with a refrigerant in a frozen grain manufacturing container have been used as abrasive grains for Plast. However, the present invention relates to a micro-frozen grain storage device for storing and storing such micro-frozen grains in a cooled state at an optimal temperature so that they can be immediately used for plastic or other purposes. .

(Prior art) When the finely frozen grains produced in the frozen grain production container are taken out from the refrigerant contained in the manufacturing container, if the ambient temperature is higher than the finely frozen grains, the microfrozen grains give up the heat of the atmosphere. Since the temperature of the micro-frozen particles increases and they tend to melt, it is necessary to maintain the temperature of the micro-frozen particles at a low level by some means until they are ready for use.

The micro-frozen grains taken out from the frozen grain production container are placed in a cold storage chamber and the external atmosphere is kept in a temperature-controlled container, and the temperature of the micro-frozen grains is maintained at a low temperature until it is ready for use. It's normal.

(Problem to be Solved by the Invention) By the way, when controlling the temperature of the external atmosphere in order to maintain the micro-frozen particles at a low temperature in a container containing the micro-frozen particles, it is necessary to maintain a uniform temperature distribution within the container. It is difficult to

In other words, when the ambient temperature is higher than the part of the micro-frozen grains, a temperature difference occurs between the micro-frozen grains in the area near the peripheral wall and the central part of the container for storing micro-frozen grains due to the influence of the ambient temperature, and the frozen grains near the outer wall When heated to the extent that it partially melts, the melted portion flows into adjacent micro-frozen spaces, where it cools and refreezes, leading to the melting and sticking of frozen particles that adhere to each other, leading to tuberculosis. It becomes difficult to take out the frozen particles from the storage container, and it becomes difficult to expect precise blasting, etc., in which uniform force is applied to the surface of the object to be treated due to frozen particles having a uniform particle size.

Furthermore, the micro-frozen grains used as abrasive grains for Ice Plast must have a hardness that corresponds to the hardness of the object to be treated or the object that is to be peeled from its surface. Since it is determined by the temperature of the grains, it is preferable to adjust the temperature of the micro-frozen grains to a desired temperature, but it is difficult to control the temperature of the atmosphere outside the container to the required temperature by using the small cycle 9. In fact, it is difficult to adjust the temperature of the micro-frozen grains according to the purpose of use by adjusting the ambient temperature.

In addition, since the finely frozen grains taken out from the frozen grain production container have refrigerant attached to them, if the finely frozen grains are supplied to the container while wet with the solvent and then used for injection, the solvent will cause stickiness. Compared to dry and smooth particles, it is difficult to give speed to the sprayed particles, and it is easy to give a uniform distribution, which causes uneven operation. To avoid this, it is necessary to separate and remove the adhering refrigerant using some kind of refrigerant removal method. There is a need.

The present invention solves these problems, effectively prevents adhesion of particles to each other, and the occurrence of melting/fixation phenomena, removes solvent, and maintains finely frozen particles at a desired temperature until they are used. It is an object of the present invention to provide a micro-frozen particle storage device that can accommodate and store micro-frozen particles.

(Means for Solving the Problems) In order to achieve the above object, the micro-frozen grain storage device of the present invention includes a container for storing micro-frozen grains, and a space for storing micro-frozen grains in the container, in which cool air is blown from below. The apparatus includes a fluidized bed forming means for forming and maintaining a fluidized bed of slightly frozen particles by ejecting gas, and a temperature adjusting means for adjusting the temperature of the cold gas.

(Function) With this configuration, the micro-frozen particles contained in the container are maintained in a fluid state by the cold gas that comes into direct contact with them, so the micro-frozen particles and the cold gas are sufficiently stirred and mixed. By performing heat exchange under these conditions, it is possible to maintain these within a certain temperature range. Moreover, the refrigerant adhering to the finely frozen particles is evenly diffused into the cold gas by the flow action of the cold gas, and can be reliably evaporated and removed. Therefore, the micro-frozen particles do not adhere to each other or melt/stick together in the container, and the micro-frozen particles do not adhere to the inner wall surface of the container, and furthermore, the micro-frozen particles can be easily taken out of the container. It can be carried out.

Moreover, by adjusting the temperature of the cold gas that is blown into the container, it is easy to set the maintenance temperature of the micro-frozen grains fairly freely, and the micro-frozen grains can be used for Ice Plast at the optimal temperature according to the purpose of use. It is suitable for use as abrasive grains, etc.

(Example) Hereinafter, the configuration of the present invention will be specifically described based on the example shown in FIGS. 1 and 2.

The finely frozen granule storage device shown in FIG. 1 includes a closed container 1, a fluidized bed forming means 2, and a cold gas temperature adjusting means 3.

The inside of the container 1 is divided into an upper micro-frozen grain storage space 1 by a partition plate 4.
a and a lower cold gas supply space 1b. A finely frozen grain supply port 5 that can be opened and closed is provided in the upper part of the container 1, and the finely frozen grains 7a produced by the frozen grain manufacturing device 6 are supplied to the frozen grain storage space 1a. The supply port 5 is closed when a predetermined amount of the finely frozen particles 7a are supplied into the container 1, thereby sealing the container 1.

Although details of the frozen grain manufacturing device 6 are omitted, heat exchange with the refrigerant is performed by spraying and dripping a liquid to be frozen such as water toward the liquid surface of a refrigerant such as liquefied ice in a frozen grain manufacturing container. It is configured to produce finely frozen particles 7a with a fine and uniform particle size, and the finely frozen particles 7a are taken out of the refrigerant by a screw conveyor or the like and supplied to the supply port 5. That's what I do. Therefore, the refrigerant is attached to the frozen particles 7a... that are supplied into the container 1. Additionally, an exhaust pipe 8 and a take-out pipe 9 are provided at the top of the container 1.
One end of this take-out tube 9 was opened downward at a suitable location in the micro-frozen particle storage space 1a, and a plast gun 10 was connected to the other end. A driving gas supply pipe 17 is connected to this plastic gun 10, and nitrogen gas pressurized to a predetermined pressure is supplied from this supply pipe 17.

By introducing a driving gas such as air, the slightly frozen particles 7a of the fluidized bed 7 are sucked into the take-out pipe 9 by a kind of ejector action, taken out from the container 1, and blasted from the blast gun 10. It is designed to be sprayed onto an object 20. That is, in this embodiment, the extraction pipe 9. The plast gun 10 and the drive gas supply pipe 17 are devised to serve as a means for transporting the finely frozen particles 7a and a plast means. This has the advantage of simplifying the device structure.

The fluidized bed forming means 2 includes a second
As shown in the figure, a large number of jet nozzles 11 communicating with two spaces 1a and 1b are installed upward, and the upper part of a cold gas tank 13 containing a liquefied gas 12 such as liquefied nitrogen or liquefied argon is connected to the container 1. The lower part is connected to the lower part through an introduction pipe 14, and cold gas 12a, which is the evaporated gas of the liquefied gas 12, is supplied to the cold gas supply space 1b, and from each jet nozzle 11 into the finely frozen particle storage space 1a. By ejecting the finely frozen particles 7a... accommodated in the space 1a...
is made to flow to form a fluidized bed 7 of slightly frozen particles 7a...

By the way, the ejection pressure of the cold gas 12a from the ejection nozzles 11... is determined based on the particle size of the slightly frozen particles 7a... and the capacity thereof, that is, the thickness of the fluidized bed 7, so that the fluidized bed 7 can be stably formed and maintained. It may be set as appropriate depending on the situation.

Those conditions can be determined experimentally by those skilled in the art. To give one specific example, the microfrozen particles 7a... are 1
When the particle size is uniform between 00 and 200 pm and the thickness of the fluidized bed 7 is 300 fl, the ejection pressure is 0. oa
It is desirable that it is around kg/d.

The cold gas 12a may be any low-temperature gas that can keep the micro-frozen particles 7a cold, but it may easily liquefy or solidify upon contact with the micro-frozen particles 7a... For example, those containing water or carbon dioxide gas are unsuitable.

The temperature adjustment means 3 includes a heat exchanger 15 in the introduction pipe 14.
and a temperature detector 16, and the driving gas supply pipe 1
The cooling pipe 18 passing through the heat exchanger 15 is branched and connected to 7 in a closed circuit, and the temperature detector 16 is connected to the temperature adjusting means 171L, which is a portion of the supply pipe 17 between the connecting points at both ends of the cooling pipe 18. A flow rate regulating valve 19 is provided which is controlled to open and close according to the detected value. The temperature detector 16 is connected to the heat exchanger 1
The temperature of the cold gas 12B that has passed through 5 is detected, and if the detected temperature is lower than a preset temperature range, the flow rate adjustment valve 19 is controlled to the closing side, and conversely, if it is higher than the set temperature range. Then, the flow rate adjustment valve 19 is controlled to the open side.

Therefore, according to the temperature adjustment means 3, the introduction pipe 1
When the temperature of the cold gas 12a introduced into the container 1 from 4 is lower than the preset temperature, the temperature detector 16 detects this and controls the flow rate adjustment valve 19 to close, thereby cooling the drive gas. Since the cold gas 1211 is led to the pipe 18, that is, the heat exchanger 15, its temperature is increased by exchanging heat with the drive gas in the heat exchanger 15, and finally the container 1 is filled with cold air whose temperature is adjusted within the set temperature range. Gas 12a is supplied.

On the other hand, the driving gas is cooled by heat exchange with the cold gas 12a and supplied to the plastic gun 1o.
This prevents the temperature of the slightly frozen particles 7a... which are ejected from rising. When the temperature of the cold gas 12a rises above the set temperature range due to heat exchange with the dry gas, the temperature detector 16 controls the flow rate adjustment valve 19 to the open side, and the drive gas is transferred to the temperature adjustment section of the cooling pipe 18 and supply pipe 17. As a result, the temperature of the cold gas 12a supplied to the container 1 decreases to the set temperature again due to the amount of heat transferred by the heat exchange between the cold gas 12a and the driving gas by the heat exchanger 15.

By repeating such operations, the cold gas 12a supplied to the container 1 can be maintained at the set temperature, and the temperature of the fluidized bed 7 can be maintained within a desired constant temperature range.

The temperature of the cold gas 12a or the fluidized bed 7 can be easily adjusted by changing the set temperature, and the temperature of the slightly frozen particles 7a in a fluidized state can be rapidly and can be easily adjusted,
It becomes very easy to maintain a constant temperature range.

In the above embodiment, the temperature adjustment means 3 was configured to not only adjust the temperature of the cold gas 12a but also cool the drive gas for blasting at the same time. Of course, it may be configured as follows. However, if the configuration is as in the embodiment described above, there is an advantage that the device structure can be simplified.

(Effects of the Invention) The micro-frozen grain storage device of the present invention maintains the frozen grains housed in the container in a fluid state by the ejection force of cold gas. It can be volatilized into a gas, and the finely frozen particles can be dried and made into smooth particles and stored in a fluidized state. Therefore, it is extremely easy to take out the microfrozen particles from the container, and the uniform particle size during production of the microfrozen particles can be maintained, making them suitable for use in iceplasts and the like. Further, there is no need to provide a special refrigerant removal means, and the device structure can be simplified.

Moreover, by adjusting the temperature of the cold gas, the temperature of the micro-frozen grains can be easily controlled, making it possible to provide the micro-frozen grains at the optimal temperature according to the purpose of use, making Ice Plast etc. extremely effective. It can be done in a specific manner.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional side view showing an embodiment of the microfrozen particle storage device according to the present invention, and FIG. 2 is an enlarged detailed view of the main parts. 1... Container, 1a... Finely frozen grain storage space, 2...
Fluidized bed forming means, 3... Temperature adjustment means, 7... Fluidized bed, 7a... Slightly frozen grains, 12B... Cold gas.

Claims (1)

[Claims] a container for storing micro-frozen grains; a fluidized bed forming means for forming and maintaining a fluidized bed of micro-frozen grains by jetting cold gas from below into a space for storing micro-frozen grains in the container; and a temperature of the cold gas. A micro-frozen grain storage device comprising a temperature adjustment means for adjusting the temperature.