JP2004324607A - Gas distributing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost gas distributing device capable of continuously changing the distribution ratio and distributing gas from a gas producing chamber to a plurality of portions while always keeping the total area of a throat constant, distributing the overall amount of gas to a required portion of the plurality of portions, and requiring a small number of actuators. <P>SOLUTION: The gas distributing device distributes a gas flow from the gas producing chamber to a plurality of outlets 11a-11d. The device is provided with a plurality of flow rate adjusting valves 12 having turnable shutters continuously changing each flow passage area communicating with a plurality of the outlets, and an interlocking control mechanism 20 interlocking a plurality of the flow rate adjusting valves mutually and controlling them. The flow rate adjusting valves 12 can continuously adjust each flow passage area from full opening to full closing. In the interlocking control mechanism 20, the total sum of the flow passage areas of a plurality of the flow rate adjusting valves is always kept constant, and the overall amount of the gas from the gas producing chamber can be sent to one arbitrary flow rate adjusting valve. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas distribution device that distributes gas from a gas generation chamber to a plurality of locations.
[0002]
[Prior art]
As a gas distribution device that distributes gas from a gas generation chamber to a plurality of locations, for example, a side thruster used for trajectory change and attitude control of a rocket, a missile, and a spacecraft is known. The side thruster is mounted on a flying object that flies in the atmosphere or outside the atmosphere, and ejects a jet in a direction substantially perpendicular to the aircraft axis to change the trajectory and control the attitude of the flying object.
[0003]
Various configurations of such gas distribution devices and side thrusters are disclosed in Patent Documents 1 to 5, and the like.
[0004]
[Patent Document 1]
JP 2000-346598 A [Patent Document 2]
JP-A-10-103156 [Patent Document 3]
JP 2001-18897 A [Patent Document 4]
JP-A-6-331300, "Side thruster of a flying object"
[Patent Document 5]
JP-A-8-219696, "Flying object control device"
[0005]
The "lateral thrust control device" of Patent Document 1 is a thruster for orbit attitude control, and is equipped with four thrusters 51 as shown in FIG. The pintle 52 of the two opposing thrusters is a pair, and by moving each pintle 52 with two servomotors 53, the throat area is changed and the thrust is adjusted. Further, in this device, since the sum of the throat areas of the opposing thrusters 52 is kept constant (の of the entire area), the sum of the entire throat areas (two sets of opposing thrusters) is calculated. Always constant.
[0006]
The “control valve for distributing gas flow” in Patent Document 2 is a thruster for orbit attitude control, and generally includes four thrusters 61 as shown in FIG. Four holes (throats 63) are formed in the hemispherical manifold 62. By rotating the control valve 64, the throat area is changed and thrust is adjusted. The control valve is rotated by two servo motors 65 like a joystick. Further, in this device, since the sum of the throat areas of the opposed thrusters is kept constant (１ ／ of the entire area), the sum of the entire areas of the throat 63 (two sets of opposed thrusters) is calculated. It is always constant.
[0007]
In the "rocket" of Patent Document 3, as shown in FIG. 17, four servomotors move each pintle 71 back and forth to change the throat area. In this device, the throat area of each thruster can be freely changed, but the structure is not structured so that the total area is mechanically kept constant.
[0008]
[Problems to be solved by the invention]
In gas distribution devices (eg, side thrusters) used in rockets, missiles, spacecraft, etc., gas generators using gas generating agents (eg, solid propellants), once started, continuously deliver high pressure gas over the time they burn. Occurs. Therefore, the total area of the throat must be kept constant so that the gas distribution device can keep the internal pressure constant.
[0009]
When the side thruster is used for trajectory change or attitude control, the thruster to be used can inject as much (preferably the entire amount) of gas as possible, and the thruster not to be used injects as little as possible (preferably to zero). Preferably it is possible.
[0010]
In the apparatuses of Patent Documents 1 and 2, half of the gas is consumed by each of the set of opposing thrusters, so that only one-half of the generated gas is effective when operated in a single axis (operating state in which a force in a direction parallel to the thruster axis is generated). Not available to At this time, the axis in the direction perpendicular to the operation direction consumes 1/4 of the gas in order to maintain neutrality. Therefore, in order to obtain the same performance as a device capable of injecting all of the gas from the thruster to be used (for example, a “rocket” in Patent Document 3), a larger amount of generated gas is required, and the gas generating device becomes larger, and the propellant becomes larger. There was a problem that the weight increased.
In addition, in this device, it is necessary to design so that the stroke of the pintle and the throat area are proportional, but it is difficult to actually design such, and even if possible, there is a possibility that loss of thruster performance may be involved. is there.
[0011]
On the other hand, since the device of Patent Document 3 has a structure using four servo motors, the weight of the servo motor, the servo amplifier, the battery, the mechanical link mechanism, etc. increases, and the number of amplifiers increases. The cost increases. Also, since each pintle moves independently, the throat area is not always constant, combustion becomes unstable, causing combustion stop or pressure rise, combustion chamber pressure becomes unstable, and thrust is not stable There was a problem.
[0012]
The present invention has been made to solve the above problems. That is, an object of the present invention is to distribute the gas from the gas generation chamber to a plurality of locations while continuously changing the distribution ratio, while always keeping the total area of the throat constant, and to distribute all the gas to the required locations among the plurality. It is an object of the present invention to provide a gas distribution device capable of distributing an amount, requiring a small number of actuators, and enabling cost reduction.
[0013]
[Means for Solving the Problems]
According to the present invention, there is provided a gas distribution device for distributing a gas flow from a gas generation chamber to a plurality of outlets,
A plurality of flow control valves having a rotatable shutter that continuously changes each flow path area leading to the plurality of outlets,
An interlocking control mechanism that interlocks and controls the plurality of flow control valves,
The flow control valve is capable of continuously adjusting each flow passage area from fully open to fully closed,
The interlocking control mechanism is configured such that the sum of the flow path areas of the plurality of flow control valves is always kept constant, and all the gas flow rates from the gas generation chamber can flow to any one flow control valve. A gas distribution device is provided.
[0014]
According to the configuration of the present invention, the flow control valve is capable of continuously adjusting each flow passage area from fully open to fully closed, and the interlocking control mechanism is configured such that the sum of the flow passage areas of the plurality of flow control valves is always constant. All the gas flow from the gas generation chamber is kept constant and can flow to any one flow control valve. Can be distributed while continuously changing the distribution ratio, and the entire gas amount can be distributed to necessary portions among a plurality.
[0015]
According to the first embodiment of the present invention, the interlocking control mechanism includes two cam plates each having a plurality of cam grooves and stacked coaxially with each other, and an intersection position of the cam grooves of the two cam plates. A plurality of cam followers, a plurality of power transmission mechanisms connecting the cam followers and the shutter, and two driving devices for independently rotating and driving the two cam plates,
The cam groove and the power transmission mechanism rotate a plurality of shutters in conjunction with each other in accordance with the rotation angle of the two cam plates to continuously change the area of each channel.
[0016]
According to this configuration, the two cam plates are independently driven to rotate by the two driving devices, and the cam followers located at the intersections of the cam grooves of the two cam plates are continuously moved, whereby the two cam plates are moved. In accordance with the rotation angle of the cam plate, a plurality of shutters can be rotated in conjunction with each other to continuously change the area of each channel.
[0017]
According to a second embodiment of the present invention, the interlocking control mechanism includes two cam plates having a guide surface on an outer peripheral portion and stacked coaxially with each other, and sliding with the guide surfaces of the two cam plates. A plurality of pairs of follower arms that swing and swing, a plurality of power transmission mechanisms that rotate a shutter by swinging of each pair of follower arms, and two driving devices that independently rotate and drive two cam plates. Has,
The cam groove and the power transmission mechanism rotate a plurality of shutters in conjunction with each other in accordance with the rotation angle of the two cam plates to continuously change the area of each channel.
[0018]
According to this configuration, the two cam plates are independently driven to rotate by the two driving devices, and the plurality of pairs of follower arms that swing by sliding on the guide surfaces of the two cam plates are continuously swung. By doing so, the plurality of shutters can be rotated in conjunction with each other in accordance with the rotation angle of the two cam plates, so that the area of each flow path can be changed continuously.
[0019]
In addition, four flow control valves corresponding to outlets in four directions perpendicular to each other, four sets of power transmission mechanisms corresponding to each flow control valve, and two driving devices that independently rotate and drive two cam plates are provided. Prepare.
With this configuration, four flow control valves can be controlled by two driving devices, so that the required number of actuators can be reduced and cost can be reduced.
[0020]
The driving device includes a gear train for rotating the cam plate, a servomotor for rotating the gear train, and a potentiometer for detecting a rotation angle of the cam plate.
With this configuration, the servomotor can be controlled by feeding back the rotation angle of the cam plate, and the rotation angle of the cam plate can be accurately controlled.
[0021]
The shutter has a throat shape so as to reduce deviation from a target throat area due to a power transmission mechanism.
With this configuration, it is possible to correct a deviation from the target throat area due to a restriction of a power transmission mechanism (for example, a link mechanism, a gear mechanism), which is a more desirable form.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to the common parts in the respective drawings, and the duplicate description will be omitted.
[0023]
FIG. 1 is a schematic view of a flying object incorporating the gas distribution device of the present invention. In this figure, (A) is a side view of the flying object 1 such as a rocket, a missile, a spacecraft, and the like, and (B) is a BB arrow view thereof. The projectile 1 incorporates the gas distribution device 10 of the present invention, and is configured to change the trajectory and control the attitude of the projectile 1 by flowing and jetting gas from a plurality of (four in this example) outlets.
[0024]
As shown in FIG. 1B, in this example, the four outlets (injections) are set in four directions (0 °, 90 °, 180 °, 270 °) orthogonal to each other. Hereinafter, each injection direction or a mechanism related thereto is indicated by symbols a, b, c, and d for convenience of explanation.
[0025]
FIG. 2 is a sectional view of a portion A in FIG. 1A in the first embodiment. As shown in this figure, a gas distribution device 10 of the present invention is composed of a gas distribution chamber 6 and a distribution control chamber 7 partitioned by a partition wall 5, and from the gas generation chamber 2 to a plurality of outlets 11a, 11b, 11c, 11d. It has a function of distributing the gas flow 3.
[0026]
FIG. 3 is a sectional view taken along line AA of FIG. In the gas distribution device 10 of the present invention, the respective flow passage areas leading to the outlets 11a, 11b, 11c, 11d are set to be the same.
The gas distribution device 10 includes four flow control valves 12. The flow control valve 12 has rotatable shutters 12a, 12b, 12c, 12d that continuously change respective flow passage areas communicating with the four outlets 11a, 11b, 11c, 11d. Each shutter 12a, 12b, 12c, 12d has a rotation axis 13a, 13b, 13c, 13d parallel to the axis Z-Z of the flying object 1, and the rotation of the rotation axis causes the exits 11a, 11b, The area of each flow passage communicating with 11c and 11d can be continuously adjusted from fully open to fully closed.
[0027]
It is preferable that each shutter has a throat shape so as to reduce deviation from a target throat area due to a power transmission mechanism described later.
[0028]
FIG. 4 is a sectional view taken along line BB of FIG. As shown in this figure, the gas distribution device 10 of the present invention further includes an interlocking control mechanism 20 that controls the four flow control valves 12 in interlocking with each other.
2 and 4, the interlocking control mechanism 20 includes two cam plates 21, 22, four cam followers 24a, 24b, 24c, 24d, four sets of power transmission mechanisms 26a, 26b, 26c, 26d, and two It comprises a driving device 28.
[0029]
FIG. 5 is a configuration diagram of the cam plate. As shown in FIGS. 2 and 4, the two cam plates 21 and 22 are stacked coaxially with each other, and are independently rotatably supported. Further, as shown in FIGS. 5A and 5B, each has four cam grooves 21a to 21d and 22a to 22d. In this figure, only the center line of the cam groove is shown by a solid line.
As shown in FIG. 5C, when the two cam plates 21 and 22 are stacked coaxially, the cam grooves of the two cam plates are set so as to intersect, and the four cam followers 24a, 24b and 24c are formed. , 24d are respectively located at the intersections of the cam grooves of the two cam plates.
[0030]
As shown in FIG. 4, the four power transmission mechanisms 26a, 26b, 26c, 26d are link mechanisms in which two link members are connected by pins in this example, respectively, and the cam followers 24a, 24b, 24c, 24d and The pivot shafts 13a, 13b, 13c and 13d of the shutter are connected.
[0031]
As shown in FIGS. 2 and 4, the two driving devices 28 each include a gear train 29 a that rotationally drives the cam plate 21 or 22, a servomotor 29 b that rotationally drives the gear train 29 a, and a cam plate 21 or 22. And a potentiometer 29c for detecting the rotation angle.
[0032]
The shapes of the cam grooves 21a to 21d and 22a to 22d of the two cam plates 21 and 22 and the power transmission mechanisms (link mechanisms) 26a, 26b, 26c and 26d are the rotation angles of the two cam plates 21 and 22. Accordingly, the four shutters 12a, 12b, 12c, and 12d are rotated in conjunction with each other to continuously change the area of each channel. In this operation, the sum of the flow path areas of the four flow control valves is always kept constant, and the entire gas flow from the gas generation chamber can be flowed to any one flow control valve.
[0033]
6 to 10 are explanatory diagrams of the operation of the gas distribution device of the first embodiment described above. In these figures, two numbers (for example, 0/0) given to the cam plates 21 are rotation angles (°) from the reference positions of the cam plates 21 and 22, and the four outlets 11a, 11b, 11c, and 11d. (For example, 0.25) indicates the ratio of each channel area to the maximum area of a single channel.
[0034]
6 to 10, FIG. 6 shows a reference position where each flow passage area is set to be the same (area ratio: 0.25), and FIG. 7 shows that two cam plates 21 and 22 are -15 from the reference position. 8 shows the position of the cam plates 21 and 22 at + 15 ° / 0 °, FIG. 9 shows the position of −15 ° / −15 °, and FIG. 10 shows the position of + 15 ° / + 15 °. I have.
[0035]
In FIG. 6, the flow path area ratios of the four outlets 11a, 11b, 11c, and 11d are all 0.25, and the gas injection amount is proportional to the flow path area. This shows a certain state. The sum of the flow path area ratios of the four outlets 11a, 11b, 11c, and 11d is 1.0, and the total area of the four outlets matches the maximum area of the single flow path. The generated gas pressure is kept constant.
[0036]
In FIG. 7, the flow path area ratios of the three outlets 11b, 11c, and 11d are all 0, and only the outlet 11a is 1. In this state, all the gas flow from the gas generation chamber can be flowed only through the flow control valve 12 at the outlet 11a. Also in this state, the sum of the flow path area ratios of the four outlets 11a, 11b, 11c, and 11d is 1.0, and the total area of the four outlets matches the maximum area of the single flow path. The gas pressure generated in step 2 can be kept constant.
[0037]
Similarly, in FIGS. 8, 9, and 10, the flow path area ratios of only the outlets 11c, 11b, and 11d are 1 and the others are all 0. Gas flow rate. In any case, the sum of the flow path area ratios of the four outlets is 1.0, the total area of the four outlets matches the maximum area of the single flow path, and the gas pressure generated in the gas generation chamber 2 is kept constant. Can be held.
[0038]
FIG. 11 is a characteristic diagram of the gas distribution device of the first embodiment. This figure shows the opening degree (vertical axis) of the four flow control valves 12 when the lower cam plate 22 is fixed at 0 ° and the rotation angle (horizontal axis) of the upper cam plate 21 is changed. . Further, four curves in the figure correspond to the shutters a to d shown in FIG.
The four sets of power transmission mechanisms (link mechanisms) and the cam grooves shown in FIG. 4 are configured such that two opposing pairs are each point-symmetric with respect to the axis Z, and the mechanisms orthogonal to each other have a phase difference of 90 °. It is configured to
As a result, as shown in FIG. 11, when the shutter a changes from the maximum to the neutral position to 0, the shutter c at the point symmetric position operates in the reverse order from 0 to the neutral position to the maximum, and the shutters b and c changes from 0 → neutral position → 0.
Therefore, from this figure, even in states other than those shown in FIGS. 6 to 10, the sum of the flow passage areas of the four flow control valves is always kept constant, and the gas generation chamber is connected to any one flow control valve. It can be seen that all the gas flow rates can be made to flow.
[0039]
FIG. 12 is another characteristic diagram of the gas distribution device of the first embodiment. This figure shows a case in which the thrust is fully opened in the uniaxial direction (direction a) and the thrust is fully opened in the triaxial direction (direction c). In this figure, the horizontal axis fixes the lower cam plate 22 at 0 °, the rotation angle of the upper cam plate 21, and the vertical axis represents the thrust in one axial direction (a direction) and the thrust in the two axial directions (b direction). is there.
From this figure, the thrust in the uniaxial direction (a direction) is continuously changed from the maximum to the maximum in the reverse direction (the triaxial direction (c direction)) while the thrust in the biaxial direction (b direction) is maintained at almost 0. It can be seen that it can be done.
[0040]
FIG. 13 is a partial sectional view showing a second embodiment of the gas distribution device of the present invention, and FIG. 14 is a partial side view thereof.
In FIG. 13, the gas distribution device 10 of the present invention includes an interlock control mechanism 30 that controls the four flow control valves 12 in conjunction with each other.
[0041]
The interlocking control mechanism 30 includes two cam plates 31, 32, four pairs of follower arms 34a, 34b, 34c, 34d, 35a, 35b, 35c, 35d, four sets of power transmission mechanisms 36, and two driving devices 28. Become. The configurations of the four flow control valves 12 and the two driving devices 28 are the same as in the first embodiment.
[0042]
13A is a plan view of two cam plates 31 and 32 and four pairs of follower arms, and FIGS. 13B and 13C are four pairs of cam plates 31 and 32 and four pairs of followers engaged with the cam plates 31 and 32, respectively. One of the lower arms is shown.
The two cam plates 31 and 32 each have a guide surface on an outer peripheral portion, and are stacked coaxially with each other. One of the four pairs of follower arms 34a, 34b, 34c, 34d (upper arm) slides on the guide surface of the cam plate 31 to swing, and the other of the four pairs of follower arms 35a, 35b, 35c,. The lower arm 35 d swings by sliding on the guide surface of the cam plate 32.
The two pairs of cam plates 31 and 32 and the four pairs of follower arms are configured such that the two opposing pairs are each point-symmetric with respect to the axis Z, and the mechanisms that are orthogonal to each other are configured so that the phases differ by 90 °. Have been.
[0043]
4, the power transmission mechanism 36 has a function of rotating the shutter 12 by combining the swinging motions of the four pairs of follower arms.
[0044]
The power transmission mechanism 36 is a kind of planetary gear device, and includes a sun gear 36a, a planet gear 36b, an internal gear 36c on the outer periphery, and a rotating plate 37 that rotates around the sun gear together with the planet gear.
The sun gear 36a is rotatably connected to one end (the left end in the figure) of the rotation shaft (13b in this figure) of the shutter 12 and one of the four pairs of follower arms 34b (upper arm) is fixed to the rotating plate 37, The other 35b (lower arm) of the four pairs of follower arms is fixed to the outer surface of the internal gear 36c.
The follower arm may be connected to the sun gear and the internal gear, and the shutter may be connected to the planet gear.
[0045]
With this configuration, the swing motion of the four pairs of follower arms 34a, 34b, 34c, and 34d can be combined to rotate the shutter 12, thereby continuously changing the area of each flow path.
Therefore, by setting the two cam plates 31, 32, four pairs of follower arms 34a, 34b, 34c, 34d, and four sets of power transmission mechanisms 36, the flow of the four flow control valves is set in the same manner as in the first embodiment. The sum of the road areas is always kept constant, and all the gas flows from the gas generating chamber can be flowed to any one flow control valve.
[0046]
It should be noted that the present invention is not limited to the above-described examples and embodiments, and it is needless to say that various changes can be made without departing from the spirit of the present invention. For example, although the side thruster is illustrated in the above-described example, the present invention is not limited to this, and can be applied to a gas distribution device that distributes gas to a plurality of locations. Further, the plate cam can be changed to a groove cam, and conversely, the groove cam can be changed to a plate cam.
[0047]
【The invention's effect】
As described above, according to the configuration of the present invention, the flow control valve can continuously adjust each flow passage area from fully open to fully closed, and the interlocking control mechanism can control the flow passage area of the plurality of flow control valves. The total sum of the throat is always kept constant, and all the gas flow from the gas generation chamber can be flowed to any one flow control valve. The distribution ratio can be continuously changed from the chamber to a plurality of locations, and the total gas amount can be distributed to a necessary location among the plurality.
[0048]
Therefore, the gas distribution device of the present invention can distribute the gas from the gas generation chamber to a plurality of locations while continuously changing the distribution ratio, while always keeping the total area of the throat constant, and can distribute the distribution ratio to necessary locations among the plurality. It has excellent effects such as the ability to distribute the entire gas amount, the required number of actuators is small, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic view of a flying object incorporating a gas distribution device of the present invention.
FIG. 2 is a sectional view of a part A in FIG. 1A in the first embodiment of the present invention.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is a configuration diagram of a cam plate of FIG. 2;
FIG. 6 is an operation explanatory view of the gas distribution device of the first embodiment.
FIG. 7 is another operation explanatory view of the gas distribution device of the first embodiment.
FIG. 8 is another operation explanatory view of the gas distribution device of the first embodiment.
FIG. 9 is another operation explanatory view of the gas distribution device of the first embodiment.
FIG. 10 is another operation explanatory view of the gas distribution device of the first embodiment.
FIG. 11 is a characteristic diagram of the gas distribution device of the first embodiment.
FIG. 12 is another characteristic diagram of the gas distribution device of the first embodiment.
FIG. 13 is a partial sectional view showing a second embodiment of the gas distribution device of the present invention.
FIG. 14 is a partial side view of FIG.
FIG. 15 is a configuration diagram of a conventional device.
FIG. 16 is a configuration diagram of a conventional device.
FIG. 17 is a configuration diagram of a conventional device.
[Explanation of symbols]
1 projectile, 3 gas flow, 5 partition, 6 gas distribution room, 7 distribution control room,
10 gas distribution device, 11a, 11b, 11c, 11d outlet (injection port),
12 flow control valve, 12a, 12b, 12c, 12d shutter,
13a, 13b, 13c, 13d rotating shaft,
20 interlocking control mechanism, 21, 22 cam plate,
21a-21d, 22a-22d cam groove,
24a, 24b, 24c, 24d cam followers,
26a, 26b, 26c, 26d power transmission mechanism (link mechanism),
28 drive, 29a gear train, 29b servo motor, 29c potentiometer,
30 interlock control mechanism, 31, 32 cam plate,
34a, 34b, 34c, 34d follower arm (upper arm),
35a, 35b, 35c, 35d follower arm (lower arm),
36 power transmission mechanism (planetary gear device), 36a sun gear,
36b planetary gear, 36c internal gear, 37 rotating plate

Claims (6)

A gas distribution device that distributes a gas flow from a gas generation chamber to a plurality of outlets,
A plurality of flow control valves having a rotatable shutter that continuously changes each flow path area leading to the plurality of outlets,
An interlocking control mechanism that interlocks and controls the plurality of flow control valves,
The flow control valve is capable of continuously adjusting each flow passage area from fully open to fully closed,
The interlocking control mechanism is configured such that the sum of the flow path areas of the plurality of flow control valves is always kept constant, and all the gas flow rates from the gas generation chamber can flow to any one flow control valve. And a gas distribution device. The interlocking control mechanism includes two cam plates each having a plurality of cam grooves and stacked coaxially with each other, a plurality of cam followers located at intersections of the cam grooves of the two cam plates, and the cam follower. A plurality of power transmission mechanisms that connect the shutters, and two driving devices that independently rotate and drive the two cam plates,
2. The cam groove and the power transmission mechanism according to claim 1, wherein a plurality of shutters are rotated in conjunction with each other in accordance with a rotation angle of two cam plates to continuously change respective flow passage areas. The gas distribution device according to claim 1. The interlocking control mechanism includes two cam plates having a guide surface on the outer periphery and stacked coaxially with each other, and a plurality of pairs of follower arms that slide and swing with the guide surfaces of the two cam plates. A plurality of power transmission mechanisms for rotating the shutter by swinging the pair of follower arms, and two driving devices for independently rotating and driving the two cam plates,
2. The cam groove and the power transmission mechanism according to claim 1, wherein a plurality of shutters are rotated in conjunction with each other in accordance with a rotation angle of two cam plates to continuously change respective flow passage areas. The gas distribution device according to claim 1. It comprises four flow control valves corresponding to outlets in four directions orthogonal to each other, four power transmission mechanisms corresponding to each flow control valve, and two driving devices for independently rotating and driving the two cam plates. The gas distribution device according to claim 2 or 3, wherein: The driving device according to claim 2, wherein the driving device includes a gear train that rotationally drives the cam plate, a servomotor that rotationally drives the gear train, and a potentiometer that detects a rotation angle of the cam plate. 5. A gas distribution device as described. The gas distribution device according to claim 2, wherein the shutter has a throat shape so as to reduce a deviation from a target throat area due to a power transmission mechanism.

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