JPH0563754B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention is used to control the plasma particle density in a fusion plasma experimental device, and is used to cool and solidify hydrogen gas to produce hydrogen pellets. This invention relates to a hydrogen pellet injection device that injects hydrogen pellets into plasma at ultrahigh speed.

(Prior Art) In the development of nuclear fusion reactors, devices for injecting hydrogen pellets into plasma in order to control plasma particles have been actively developed. A conventional hydrogen pellet launcher forms a single pellet generation hole in a pellet carrier disk, generates hydrogen pellets in this pellet generation hole, and then rotates the pellet carrier disk 180 degrees to generate pellets. The hole faces the high-pressure gas introduction pipe for firing and the gun barrel, and a high-speed solenoid valve opens and closes instantaneously to fire hydrogen pellets.

Furthermore, in order to control the plasma particles, it is also required to sequentially fire a plurality of hydrogen pellets with a slight time difference. The device for this purpose is to use the above device to form a plurality of pellet generation holes in the pellet carrier disk, generate hydrogen pellets in each pellet generation hole, and then rotate the pellet carrier disk. It is conceivable to arrange the pellet generation holes to face the high-pressure gas introduction pipe for firing and the gun barrel, respectively, and to fire the hydrogen pellets by opening and closing the high-speed electromagnetic valve with a slight time lag.

In the case of the above configuration, since a plurality of pellet forming holes are formed in one pellet carrier disk, a particular problem is how to efficiently cool the hydrogen in each pellet forming hole.

(Object of the Invention) The present invention was made to solve such conventional problems, and it is a hydrogen pellet injection method that can efficiently cool a pellet carrier disk using first and second cryoheads. It provides equipment.

(Structure of the Invention) In the present invention, a first cryohead, a second cryohead, and a pellet carrier disk are arranged in a casing whose inside is kept in a vacuum, and the pellet carrier disk is cooled to an extremely low temperature. It has a cooling means, a hydrogen gas supply means for supplying hydrogen gas for hydrogen pellets, and a high pressure gas supply means for firing hydrogen pellets, and the pellet carrier disk has a first pellet generation hole consisting of a through hole. is formed, and the pellet carrier disk is configured to be rotatable by actuating means outside the casing, and a first cryohead is disposed opposite to one surface of the pellet carrier disk, and a first cryohead is arranged to face one side of the pellet carrier disk, and a first cryohead is arranged to face one side of the pellet carrier disk, A second pellet generation hole that supplies the first pellet generation hole and a pellet injection hole that injects high pressure gas into the first pellet generation hole to shoot hydrogen pellets are formed, and the second cryohead A blind plug is disposed facing the other surface of the pellet carrier disk and closes the second pellet generation hole when the hydrogen pellets are generated, and a gun barrel accelerates the ejected hydrogen pellets. Either the first cryohead or the second cryohead is fixed to the casing, the first cryohead and the second cryohead are made of a material with high thermal conductivity, and the first cryohead and the second cryohead are made of a material with high thermal conductivity. A driving means is provided for pressing the second cryohead against the pellet carrier disk, and the driving means has one end fixed to the first cryohead and the other end of the central shaft passing through the second cryohead. the first cryohead and the second cryohead to the pellet carrier disk.

The driving means may include a fluid cylinder and a high-pressure fluid supply means for supplying high-pressure fluid to the fluid cylinder from outside the casing. Further, the driving means includes an electromagnet and an adsorbent adsorbed by the electromagnet, which are arranged opposite to each other, and
One cryohead may be coupled to the central shaft and the other cryohead may be coupled to a second cryohead, and the first cryohead and the second cryohead may be crimped to the pellet carrier disk by energizing the electromagnet. .

The driving means includes a thrust bearing collar screwed onto the end of the central shaft, a holder that rotatably holds the thrust bearing collar, and a motor that rotates the thrust bearing collar. The body may be coupled to a second cryohead such that rotation of the thrust bearing collar presses the first cryohead and the second cryohead against the pellet carrier disk. Further, the driving means includes a spring made of a shape memory alloy disposed between the end of the central shaft and the second cryohead, and heating means and cooling means for this spring, and the driving means is configured to be heated by the heating means. The first cryohead and the second cryohead may be compressed to the pellet carrier disk using the deforming force of the spring.

In the above structure, the first cryohead and the second cryohead are compressed to the pellet carrier disk by the driving means, thereby achieving efficient cooling, and the driving means is coupled to the first cryohead. Because it is attached to the central axis, the crimping force is not applied to the casing, which simplifies the construction of the device and eliminates the need to connect the drive means to the casing. Therefore, there is no heat escape due to this, and the cooling efficiency can also be improved in this respect.

(Embodiment) In FIG. 1, the casing of the main body of the apparatus is composed of a main casing 10, an inlet side casing 60 and an outlet side casing 40 arranged on both sides thereof. One flange 1 of this main casing 10
6 is connected to the inlet side casing 6 via a flange 62.
The flange 60a of the outlet side casing 40 is connected to the other flange 16 via the flange 63. In addition, a cover 60c is provided at the other end of the inlet side casing 60.
However, there is a cover 4 on the other end of the outlet side casing 40.
0c are attached to each.

A measuring plate 46 is disposed within the outlet side casing 40, and hydrogen pellets fired through a gun barrel 7 (described later) as shown by an arrow P are made to collide with this measuring plate 46. Also cover 40c
A viewing window 45 is provided through which the state in which the hydrogen pellets collide with the measuring plate 46 can be observed.

Note that a cover 40 is provided on the outlet side casing 40.
Originally, a fusion plasma experimental device is connected instead of c, but in this device, a measurement plate 46 is used instead of the fusion plasma experimental device.

A shield casing 4 is arranged inside the main casing 10, and this shield casing 4
A shield cover 41 and a shield cover 42 are attached to both sides of the shield casing 41 and a shield cover 42, respectively, and a shield casing 43 protruding outward and a shield cover 44 at the end thereof are attached to the center of the shield cover 42.

Further, a bellows 47 surrounding the outer periphery of the shield casing 43 is connected to the shield cover 42 via a flange 47a, and the other flange 47b of the bellows 47 is connected to the flange 63. The shield covers 41 and 42 are each coupled to the main casing 10 by coupling members (not shown), thereby fixing the shield casing 4 at a predetermined position within the main casing 10.

Inside this shield casing 4, a first cryohead 1 and a second cryohead 2 are arranged facing each other, and a pellet carrier disk 3 is interposed between them. The first cryohead 1 is the second cryohead 2
It is formed with a larger outer diameter, and a second
One flange 14 of a cylindrical bellows 16 is connected via a mounting ring 13 surrounding the cryohead 2, and the other flange 1 of this bellows 16 is connected to the
5 is coupled to the shield cover 42.
As a result, it is divided into two chambers: a chamber 100 inside the bellows 16 and the outlet side casing 40, and a chamber 200 inside the main casing 10 outside thereof, and each chamber 100 and 200 is evacuated (not shown). It is evacuated to vacuum by means.

Further, the first cryohead 1 and the mounting ring 13 are connected to the shield casing 4 by connecting bolts 65. Although the drawing shows only one connecting bolt 65 in the circumferential direction, a plurality of connecting bolts 65 are provided in the circumferential direction, thereby fixing the cryohead 1 at a predetermined position within the shield casing 4.

As shown in FIG. 2, the first cryohead 1, the second cryohead 2, and the pellet carrier disk 3 each have a through hole formed in the center, and a hollow outer part passing through the through hole. A shaft 90 is attached to the first cryohead 1. In the center of the pellet carrier disk 3 is a sleeve 9.
2 is attached, and this sleeve 92 is attached to the outer shaft 9.
0 and the first cryohead 1, and a bearing 94 is interposed between the sleeve 92 and the outer ring 90, so that the pellet carrier disk 3 can rotate with respect to the outer shaft 90. installed.

Further, a sleeve 93 is interposed between the second cryohead 2 and the outer shaft 90, and this sleeve 93
A bearing 94 is also interposed between the cryohead 2 and the outer shaft 90, and the second cryohead 2 is mounted so as to be movable in the axial direction with respect to the outer shaft 90. Further, at one end of the outer shaft 90, an end flange 91 is fixed to the first cryohead 1 together with the outer shaft 90 by bolts 90a, and a central shaft having one end joined to the end flange 91. 9 passes through the outer shaft 90 and projects to the other side.

An end flange 84 is attached to the other end of the central shaft 9 by screwing onto a thread on its outer periphery, and a member constituting the pressure chamber 8 is connected to this end flange 84 by bolts 84a. , the central axis 9 passes through the members constituting the pressure chamber 8.
The pressure chamber 8 includes a pair of cylindrical bellows 83 with a large diameter and a small diameter, and end plates 81 and 8 at both ends thereof.
It is formed by an annular space surrounded by 2 and 2. A helium gas introduction pipe 76 is connected to the end plate 82, through which helium gas is supplied under pressure into the pressure chamber 8, and the end plate 81 is moved in the direction of the second cryohead 2.

The helium gas introduction pipe 76 is led out of the casing from a nozzle 76a of the outlet side casing 40, and is connected to a helium gas supply facility (not shown).

A cylindrical spacer 80 surrounding the central axis 9 is coupled to the second cryohead 2, and the other end of the spacer 80 faces the end plate 81 in close proximity to the end plate 81. The pressure is transmitted to the second cryohead 2 in an adiabatic manner.

The first cryohead 1 is constructed as shown in FIG. 2 and FIGS. 4 to 6. That is, the cryohead 1 is composed of a plate-shaped body made of a material with good thermal conductivity, such as oxygen-free copper, and a plurality of cryoheads (six in this embodiment) extend through the plate-shaped body in the circumferential direction. An adapter 5 is attached, and this adapter 5 is made of a material with low thermal conductivity such as stainless steel or ceramics. Further, a spiral recess is formed on one surface of the first cryohead 1, and a cold material introduction pipe 77 for cooling is arranged in the recess.

In addition, a ring-shaped protrusion is formed in the center of the first cryohead 1, and the tip thereof is a cooling surface 3 that is in surface contact with the pellet carrier disk 3.
9 is formed.

In the adapter 5, a pellet ejection hole 51 and a pellet generation hole (second pellet generation hole) 52, each consisting of a pair of through holes, are formed on the same circumferential locus. And each pellet firing hole 51
A high-pressure gas introduction pipe 20 is installed opposite to the pellet forming hole 52, and a hydrogen gas introduction pipe 30 is installed opposite to the pellet forming hole 52.

The high-pressure gas introduction pipe 20 is led out of the casing through the nozzle 28 of the inlet-side casing 60, and is connected to high-pressure gas supply equipment (not shown) via a high-speed solenoid valve 29. This high speed solenoid valve 29
A plurality of (six in this embodiment) are provided corresponding to each high-pressure gas introduction pipe 20, and these are operated in sequence at high speed with a slight time difference.

Further, the hydrogen gas introduction pipe 30 includes a flexible tube 31, a distribution pipe 32, and a hydrogen gas introduction pipe 34.
It is connected to hydrogen gas supply and exhaust equipment (not shown) outside the casing via. The hydrogen gas supply pipe 34 is spirally wound around the outer peripheral surface of the shield casing 4 and fixed by means such as brazing. Also, shield casing 4
Between the hydrogen gas supply pipes 34, on the outer periphery of the
A cold material introduction pipe 78 for introducing a cold material such as liquid nitrogen or liquid helium is wound in a similar spiral arrangement and fixed by means such as brazing in the same manner as described above. These tubes 34 and 78 are alternately arranged close to or in contact with each other so that heat can be exchanged.

The second cryohead 2 is also made of the same material as the first cryohead 1, and an adapter 56 and an adapter 61 are attached to the portion facing the adapter 5 by tightening them with nuts 51a and 61a, respectively. One end of the gun barrel 7 is fitted through the adapter 56, and the adapter 61 constitutes a blind stopper, and is formed of a cylindrical body with a flat end surface. This adapter 56
are constructed from materials such as stainless steel that have low thermal conductivity.

Also, on one side of the second cryohead 2,
Similar to the first cryohead 1 described above, a cold material introduction pipe 77 for cooling is arranged. Liquid helium is supplied to this cold material introduction pipe 77 from a liquid helium supply facility outside the casing, and after cooling the first and second cryoheads 1 and 2, it is discharged outside the casing.

In addition, a ring-shaped protrusion is formed in the center of the second cryohead 2, and the tip end thereof is a cooling surface 3 that is in surface contact with the pellet carrier disk 3.
9 is formed, and the pellet carrier disk 3 is formed by the cooling surface 39 of the first cryohead 1.
is sandwiched between the two for cooling.

The adapters 5 and 56 may be made of any material other than stainless steel or ceramics as long as they have low thermal conductivity at low temperatures.

The pellet carrier disk 3 is constructed as shown in FIG. That is, the pellet carrier disk 3 is made of a thin stainless steel plate (0.5
4 mm), and slits 35 reaching the outer periphery are formed radially to form six triangular areas in the circumferential direction and a pair of rotating arms 38 protruding in opposite directions. It is formed. In each of these triangular regions, pellet generation holes (first pellet generation holes) 5, which will be described later, are formed.
3 is formed.

In addition, the area inside these areas (broken line 39a
An annular region to which the cooling surfaces 39 of the first and second cryoheads 1 and 2 are pressed is formed in the inner annular region.

By forming the slits 35, the regions in which the pellet forming holes 53 are formed are separated from each other so that each region can be freely bent, and the slits 35 are formed around the pellet forming holes 53. This is to ensure that the packing 33 to be crimped adheres well. Also, by separating the regions from each other, there is an effect of inhibiting heat transfer between the regions. That is, as will be described later, when heat is generated in one pellet generation hole 53 due to the injection of hydrogen pellets, this heat is transferred to the pellet carrier disk 3.
The inner transmission path passes through the area inside the broken line 39a, and since the cooling surface 39 is crimped to this area, heat is absorbed and the heat is transferred to the adjacent pellet generation hole 53. is prevented.

An operating wire 36 is connected to the rotating arm 38, and this operating wire 38 is led out of the casing and connected to an actuating means (not shown). By pulling either of the operating wires 36, the pellet carrier disk 3 is rotated by a predetermined amount. A stopper (not shown) is provided to regulate the amount of rotation, and the rotating arm 38 comes into contact with this stopper, thereby accurately controlling the amount of rotation.

FIG. 8 shows another embodiment of the pellet carrier disk 3, the basic structure of which is the same as that described above, but approximately half the area 37 on the base side of the triangular area is formed to have a thinner plate thickness. By forming the region 37 with a thin plate thickness in this manner, the above-mentioned effect of allowing each region to freely flex with respect to each other and making the packing 33 which is crimped around the pellet forming hole 53 adhere well can be better achieved. .

As shown in FIG. 3, the pellet generation hole 53 formed in the pellet carrier disk 3 is formed at a position opposite to the pellet ejection hole 51 and the center hole 54 formed in the first cryohead 1. By rotating the pellet carrier disk 3, the pellet forming holes 53 are also opposed to the pellet forming holes 52. By facing the center hole 54 of the gun barrel 7, the pellet generation hole 53 communicates the high pressure gas introduction pipe 20 with the center hole 54 of the gun barrel 7, and by facing the adapter 61, the pellet generation hole 53 is closed. That's what I do.

In addition, a gasket 33 is attached to each end face of the adapters 5, 56, and 61 so as to be crimped on both sides around the pellet generation hole 53 of the pellet carrier disk 3, so that the gas Also, the high pressure gas introduced through the high pressure gas introduction pipe 20 is prevented from leaking into the chamber 200. Furthermore, the first
Projections are formed on opposing surfaces of the cryohead 1 and the second cryohead 2, and a cooling surface 39 that is pressed against the pellet carrier disk 3 is formed on the tip end surface of the protrusion.

FIG. 9 shows another example of the driving means, in which a stopper 9a is provided near the end of the central shaft 9, and an armature (adsorbent) 87 is fitted onto the outside of the nut 8.
It is tightened by 8. Also spacer 80a
is attached to the second cryohead 2, and an electromagnet 86 with a coil 86a is attached to the other end of the spacer 80a, and this electromagnet 86 and an adsorbent 87 that is attracted to it are arranged opposite to each other. ing.

In this configuration, since the attracting body 87 is fixed to the central axis 9, the electromagnet 86 is attracted to the attracting body 87 by energizing the coil 86a, and this attractive force causes the electromagnet 86 to move to the second cryo-clamp through the spacer 80a. A pressing force is applied to the head 2 in the left direction in the drawing, thereby pressing the first cryohead 1 and the second cryohead 2 onto both sides of the pellet carrier disk 3.

FIG. 10 shows yet another example of the driving means, in which a thrust bearing collar 97a is attached to the outer periphery of the end of the central shaft 9.
This thrust bearing collar 97a is coaxially connected to the rotating shaft 95a of the motor 95 by a shaft joint 96. This joint 96 is connected to the rotating shaft 95
A is fixed to the thrust bearing collar 97.
It transmits only rotational force to a, and is connected to be movable relative to the shaft in the axial direction. Also spacer 8
One end of the cryohead 2 is connected to the second cryohead 2, and a spacer 98 and a cover 99 are sequentially connected to the flange 80a at the other end to form a holder. The thrust bearing collar 97a is rotatably held by this holder via a bearing 97.

In this configuration, the motor 95 rotates the rotating shaft 95a.
When the thrust bearing collar 97a is rotated through the shaft 9, the thrust bearing collar 97a moves forward along the thread on the outer periphery of the central shaft 9, presses the second cryohead 2 through the bearing 97 and the spacer 80, and presses the second cryohead 2 through the bearing 97 and the spacer 80. A cryohead 1 and a second cryohead 2 are pressed onto both sides of the pellet carrier disk 3.

FIG. 11 shows yet another example of the driving means, in which a heat insulating spacer 71 is provided between an end flange 84 attached to the end of the central shaft 9 and a spacer 80 attached to the second cryohead 2. A spring 72 made of a shape memory alloy is disposed therebetween. This spring 72 has a heat storage body 73 made of copper alloy, etc., and a heating coil (heater) 74.
A cooling pipe 7 is connected to a heating means formed by winding the heat storage body 73 and has a stop valve 75a on the heat storage body 73.
5 is also connected to the cooling means.

In this configuration, the spring 72 is expanded by heating by the heating means and presses the second cryohead 2 through the spacer 80, thereby moving the first cryohead 1 and the second cryohead 2 onto the pellet carrier disk. 3 so that it is crimped on both sides. Further, the heating is stopped and the spring 72 is cooled by operating the stop valve 75a, thereby releasing the pressing force.

FIG. 12 shows yet another example of the driving means, in which the configuration of the pressing force generating section at the end of the central shaft 9 is the same as that shown in FIG. 2, but in this configuration, the first cryohead 1 is The difference is that the cryohead 2 is movable and the second cryohead 2 is fixed. That is, there is a flange 2 between the first cryohead 1 and the shield cover 42 of the shield casing 4.
A bellows 25 is attached via 6 and 27, and the second cryohead 2 and the shield cover 42
A cylindrical support 22 is connected between the support 22 and the support 22 by flanges 23 and 24 at both ends thereof.

In this configuration, the first cryohead 1 is moved by pressurization in the pressure chamber 8, so that the first cryohead 1 and the second cryohead 2 are pressed onto the pellet carrier disk 3. become.

Next, the operation of this device will be explained. First room 10
After the inside of the shield casing 4 and the inside of the chamber 200 are evacuated by the vacuum evacuation equipment, cold material (for example, liquid nitrogen) is supplied to the cold material introduction pipes 77 and 78 from separate supply equipment. The first and second cryoheads 1 and 2 are cooled. After cooling the first and second cryoheads 1 and 2 to near the liquid temperature of the cold material, the supply of cold material is stopped and helium gas is introduced to cool the cold material in the cold material introduction pipes 77 and 78. The first and second cryoheads 1 and 2 are sufficiently cooled to extremely low temperatures by purging and then supplying liquid helium.

On the other hand, the actuating wire 3 is operated by an actuating means (not shown).
6, the pellet carrier disk 3 is rotated so that the pellet forming hole 53 faces the pellet forming hole 52 of the first cryohead 1. In this state, the pellet generation hole 53 also faces the adapter (blind plug) 61 of the second cryohead 2.

Then, high-pressure helium gas is supplied to the pressure chamber 8 through the helium gas introduction pipe 76 from a helium gas supply facility (not shown). Since the end plate 82 is fixed to the first cryohead 1 via the central shaft 9, the end plate 81 is pushed by the pressurization of the pressure chamber 8, and is attached to the second cryohead 2 via the spacer 80. Press. As a result, the second cryohead 2 is pushed toward the first cryohead 1, and the cooling surfaces 3 of the first and second cryoheads 1 and 2 are
9, the pellet carrier disk 3 is clamped and cooled.

The first and second cryoheads 1 and 2 are made of a material with high thermal conductivity, and the cooling surface 39 is formed in an annular shape in a limited area, and this cooling surface 39 is formed with respect to the pellet carrier disk 3. When crimped from both sides, the cooling surface is in perfect contact with the pellet carrier disk so that there is good thermal conductivity between it and the pellet carrier disk, so that the pellet carrier disk is rapidly cooled.

At the same time, the packing 33 opens the pellet forming hole 53.
The pellet forming hole 53 is pressed against the peripheral edge of the pellet forming hole 53 to form a seal, and an adapter (blind plug) 61 is brought into contact with the pellet forming hole 53 to close it.

At this time, in the pellet carrier disk 3, since the regions where the packing 33 is crimped are separated from each other by the slits 35, each region can be freely bent, so that the sealing by the packing 33 is completely completed. done to. In particular, in the configuration shown in FIG. 8, the area where the pellet forming hole 53 is formed is easily bent by the thin area 37 of the plate, making it easy to achieve a complete seal.

Next, hydrogen gas is supplied to each hydrogen gas introduction pipe 30 and pellet generation hole 53 through the hydrogen gas introduction pipe 34, distribution pipe 32, and flexible tube 31, respectively. While passing through the hydrogen gas introduction pipe 34, this hydrogen gas is cooled (precooled) by a cold material introduction pipe 78 arranged spirally adjacent to the hydrogen gas introduction pipe 34, and then
The hydrogen gas is distributed and supplied to each hydrogen gas introduction pipe 30 (six in this embodiment) through the distribution pipe 32. The hydrogen gas supplied into the pellet generation hole 53 is cooled to an extremely low temperature (10 〓 or less) around it,
It solidifies in a short time to produce solid hydrogen pellets.

After confirming the production of the solid hydrogen pellets, the high pressure helium gas in the pressure chamber 8 is discharged through the helium gas introduction pipe 76, and the pellet carrier disk 3 is sandwiched between the first and second cryo heads 1 and 2. unlock. Then, the pellet carrier disk 3 is rotated by the actuating device to form the pellet generation hole 53 filled with solid hydrogen pellets.
the pellet ejection hole 51 of the first cryohead 1
and facing the center hole 54 of the gun barrel 7. As shown in FIG. ) are opposed to the pellet ejection holes 51, respectively.

On the other hand, the tip of the pellet generation hole 52 that was facing the pellet injection hole 53 shifts to the side, but since the hydrogen inside this tip also solidifies due to cooling and solid hydrogen is generated, hydrogen gas will not leak.

In this state, high pressure helium gas is again introduced into the pressure chamber 8, the second cryohead 2 is pressed through the spacer 80, and the pellet carrier disk 3 is cooled by being sandwiched between the cooling surfaces 39. 33 to seal the periphery of the pellet forming hole 53. The high-pressure electromagnetic valves 29 are operated one after another with a slight time difference to introduce high-pressure gas through the high-pressure gas introduction pipe 20, and the pressure of this gas causes the solid hydrogen pellets in each pellet generation hole 52 to be fired one after another.

The fired hydrogen pellets are accelerated in the gun barrel 7 and successively fly toward the fusion plasma experimental device (in this embodiment, they collide with the measurement plate 46).

During the above-mentioned ejection, high pressure gas is introduced into the pellet ejection hole 51 and the pellet generation hole 53, so that the pellet carrier disk 3, which has been cooled to an extremely low temperature, is heated, and the heat is transferred to the surroundings. If this heat is rapidly transferred to the adjacent pellet generation hole 53 filled with hydrogen pellets to be ejected next, there is a risk that the solidified hydrogen pellets will be melted. This prevents rapid transfer of heat. That is, although the first cryohead 1 is made of a material with high thermal conductivity, the adapter 5 having the pellet ejection hole 51 is made of a material with low thermal conductivity as described above, Firing hole 51
heat is not transferred quickly to the surroundings.

In addition, since an adapter 56 made of a material with low thermal conductivity is attached to the part of the second cryohead 2 facing the pellet generation hole 53, rapid heat conduction from there to the next hydrogen pellet injection position is prevented. Prevented.

Furthermore, the pellet carrier disk 3 also has slits 35 formed between the pellet generation holes 53 to make it difficult for heat to be transferred, and the transmission path of this heat in the pellet carrier disk 3 is shown in FIG. Since the cooling surface 39 is crimped to this region, the heat is absorbed and the heat is prevented from being transmitted to the adjacent pellet forming hole 53. .

The high-pressure gas introduced for ejecting the hydrogen pellets is evacuated in the chamber 100 so that it does not accompany the hydrogen pellets into the fusion plasma experimental apparatus.

After completing the firing of all hydrogen pellets, the pellet carrier disk 3 is returned to its original state. That is, first, the high pressure helium gas in the pressure chamber 8 is discharged through the helium gas introduction pipe 76,
The pellet carrier disk 3 is released from being held between the first and second cryoheads 1 and 2, and the pellet carrier disk 3 is made rotatable. Then, the pellet carrier disk 3 is rotated by an operation means (not shown) so that the pellet generation hole 53 faces the pellet generation hole 52 of the first cryohead 1 and the adapter (blind plug) 61 of the second cryohead 2.

In this state, the tip of the pellet forming hole 52 of the first cryohead 1 is filled with solid hydrogen, so it is necessary to dissolve it.
Therefore, high pressure helium gas is again introduced into the pressure chamber 8, the second cryo head 2 is pressed through the spacer 80, the pellet carrier disk 3 is sandwiched between the cooling surfaces 39, and the packing 33 is crimped. The periphery of the pellet generation hole 53 is sealed. Then, the supply of liquid helium introduced into the liquid helium conduit 77 is temporarily stopped.
This causes the temperature of the first and second cryoheads 1 and 2 to rise, and the solid hydrogen in the pellet forming holes 52 is dissolved by the heat.

Hydrogen rapidly expands due to this dissolution, but the distribution pipe 32 performs a cushioning action and the hydrogen gas is discharged through the hydrogen gas introduction pipe 34.

One cycle of ejecting hydrogen pellets has been completed by the above operation, so the above operation of cooling the first and second cryoheads 1 and 2 by supplying liquid helium to the cold material introduction pipe 77 is repeated. .

Note that in the configuration of each of the drive means described above, the force that presses the second cryohead 2 is received by the first cryohead 1 through the central shaft 9, and the force acts only between them, and the force that presses the second cryohead 2 is received by the first cryohead 1 through the central shaft 9. Since pressure support is not required, the configuration is simplified, and the problem of heat escape that occurs when a support member is provided between the main body casing 10 is also solved.
This results in a device with good cooling efficiency.

(Effects of the Invention) As explained above, according to the present invention, the first cryohead and the second cryohead are pressed against the pellet carrier disk by the driving means, thereby achieving efficient cooling. In addition, since this driving means is attached to the central shaft connected to the first cryohead, no pressing force is applied to the casing, which simplifies the configuration of the device. Since there is no need to connect the driving means to the casing, there is no heat loss, and cooling efficiency can be improved in this respect as well.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of the entire device showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the central part thereof, and Fig. 3 is a longitudinal sectional view of the entire device showing an embodiment of the present invention.
The figure is a partially enlarged cross-sectional view of the pellet carrier disk in Figure 2, Figure 4 is a front view of the cryohead in Figure 1, Figure 5 is a central longitudinal cross-sectional view, Figure 6 is a rear view, and Figure 7 is a cross-sectional view of the cryohead in Figure 1. is a front view of the pellet carrier disk, FIG. 8 is a front view showing another example of the pellet carrier disk, and FIGS.
and FIG. 9 is a longitudinal cross-sectional view showing another example of the driving means for pressing the second cryohead onto the pellet carrier disk. 1... First cryo head, 2... Second cryo head, 3... Pellet carrier disk, 4... Shield casing, 5, 56, 61
...adapter, 7 ... gun barrel for firing hydrogen pellets, 8 ... pressure chamber, 9 ... center shaft, 10 ... main body casing, 72 ... shape memory alloy spring, 80, 80a ... heat insulation spacer, 86...Electromagnet, 87...Adsorption body, 95...Motor, 97
a...Thrust bearing collar.

Claims (1)

[Claims] 1. A first casing in which the inside is kept in a vacuum.
A cryohead, a second cryohead and a pellet carrier disk are arranged, a cooling means for cooling the pellet carrier disk to an extremely low temperature, a hydrogen gas supply means for supplying hydrogen gas for hydrogen pellets, and a hydrogen pellet. a high-pressure gas supply means for ejecting pellets, the pellet carrier disk has a first pellet generation hole formed of a through hole, and the pellet carrier disk is rotatable by actuating means outside the casing. The first cryohead is arranged opposite to one side of the pellet carrier disk, and the second cryohead is arranged to supply hydrogen gas to the first pellet generation hole.
a pellet generating hole and a pellet firing hole for injecting high pressure gas into the first pellet generating hole to shoot hydrogen pellets, and a second cryo head facing the other surface of the pellet carrier disk. The first cryohead or the second cryohead is equipped with a blind stopper, which is arranged to close the second pellet generation hole when the hydrogen pellets are generated, and a gun barrel that accelerates the ejected hydrogen pellets. one of the cryoheads is fixed to the casing, the first cryohead and the second cryohead are made of a material with high thermal conductivity,
A drive means is provided for pressing the first cryohead and the second cryohead against the pellet carrier disk, the drive means having one end fixed to the first cryohead and driving the second cryohead. A hydrogen pellet injection device, the hydrogen pellet injection device being connected to the other end of the penetrating central shaft and configured to press the first cryohead and the second cryohead against the pellet carrier disk. 2. The hydrogen pellet injection device according to claim 1, wherein the driving means comprises a fluid cylinder and a high-pressure fluid supply means for supplying high-pressure fluid to the fluid cylinder from outside the casing. 3 In the driving means, an electromagnet and an adsorbent adsorbed by the electromagnet are arranged opposite to each other, one is connected to the central axis and the other is connected to the second cryohead, and the electromagnet is energized to cause the second cryohead to move. Claim 1 characterized in that the first cryohead and the second cryohead are configured to be crimped onto a pellet carrier disk.
Hydrogen pellet injection device described in Section 2. 4. The driving means includes a thrust bearing collar screwed onto the end of the central shaft, a holder that rotatably holds the thrust bearing collar, and a motor that rotates the thrust bearing collar. A patent characterized in that the cryohead body is coupled to a second cryohead and is configured such that rotation of the thrust bearing collar causes the first cryohead and the second cryohead to be crimped to the pellet carrier disk. A hydrogen pellet injection device according to claim 1. 5. The driving means includes a spring made of a shape memory alloy disposed between the end of the central shaft and the second cryohead, and heating means and cooling means for this spring, and the The hydrogen pellet according to claim 1, wherein the first cryohead and the second cryohead are compressed to the pellet carrier disk using the deformation force of the spring. Injection device.