JP2012056556A - Buoyancy control device for scuba diving - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buoyancy control device for scuba diving, which does not vary the buoyancy even if the depth of a dive is changed, is easy in controlling buoyancy, is lightweight, and does not necessitate a special diving technique.SOLUTION: The buoyancy control device used for scuba diving includes: at least one or more buoyant bodies 2 having a device in which an effective capacity can be changed by the handling of a diver; an air supply device 5 for supplying air to the buoyant bodies 2 from an air cylinder 1 automatically according to the ambient pressure; a one-way automatic relief valve for discharging surplus air caused when the inner pressure of the buoyant bodies 2 rises; a variable mechanism for varying the capacity of the buoyant bodies 2; a fixing device for fixing an air tank for scuba diving; and a band member 6 with which the diver can carry the device on his/her back.

Description

  The present invention relates to a buoyancy adjustment device used in scuba diving.

  The product currently on the market is a bag-like buoyant body that is airtight as a buoyant body, integrated with the holding harness for the air tank for scuba diving, and if the buoyancy is insufficient in water, the bag-like buoyancy A method is used in which an appropriate amount of air from the air tank is introduced into the body, the buoyancy is adjusted by that amount, and when the buoyancy becomes excessive, a separately provided exhaust valve is opened and exhausted to reduce buoyancy.

  However, in the bag-like buoyancy body, the internal air is compressed or expanded by changing the depth of diving, so that the volume of the buoyancy body becomes small or large and the buoyancy varies. Therefore, the diver who is a user needs to pay attention to buoyancy adjustment by taking in and out the air inside the buoyancy body every time the depth changes.

  Furthermore, once the levitation starts, the air inside the buoyancy body expands and strengthens the buoyancy, so that unskilled divers cannot stop the levitation and cause dangerous diving. There are not a few cases in which it rises at speed and has an adverse effect on the human body. For this reason, development of a buoyancy adjustment device that does not change buoyancy regardless of the depth of diving is required.

  On the other hand, a buoyancy adjustment device for scuba diving has been developed in which a container having a certain capacity is used as a buoyancy body, and an appropriate amount of seawater is taken in and out to adjust the buoyancy (see Patent Document 1). However, in this buoyancy adjusting device, there is a problem that the seawater put inside the buoyancy body moves depending on the posture of the diver and the balance in the water greatly fluctuates and is difficult to use.

  Moreover, in order to keep the internal pressure constant in a diving suit or the like, an invention has been disclosed in which the pressure regulator mechanism is diverted and an exhaust valve is separately provided to maintain the pressure (see Patent Document 2). . However, in this method, buoyancy cannot be adjusted, and buoyancy varies greatly depending on the posture, and cannot be used as buoyancy adjustment.

JP-A-53-2897 (first page) JP-A-8-127390 (first page)

  Provided is a buoyancy adjustment device for scuba diving that keeps the buoyancy in water constant regardless of the depth, allows the diver to adjust it during diving, is lightweight and small, and does not require special diving techniques.

The present invention has the following configuration in order to solve the above problems.
According to one embodiment of the buoyancy adjustment device for scuba diving according to the present invention, a cylinder formed of a hard material as a buoyancy body is hermetically closed at either the upper end or the lower end, and is substantially piston-shaped that moves in the middle. The buoyancy can be varied by forming an intermediate wall and changing the effective volume of the cylinder by moving the position of the intermediate wall.

  Further, according to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, in order to counter the increase in pressure applied to the cylinder as a buoyant body as the depth increases, it is similar to the second stage regulator for respiration. An air supply device may be provided to supply air from a diving air tank.

  Further, according to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, when the depth decreases, the pressure applied to the cylinder as the buoyant body decreases, and therefore the intermediate wall or the end face of the cylinder that is airtightly closed and the vicinity thereof In addition, an exhaust valve using a one-way valve may be provided to discharge excess air.

  Further, according to one embodiment of the buoyancy adjustment device for scuba diving according to the present invention, in order to stabilize the posture of the diver in the water, a cylinder serving as a buoyancy body is provided on a pair of left and right air tanks. it can.

  Further, according to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, the buoyancy is varied by moving the intermediate wall. To reduce the size of the entire device, a multi-thread screw is provided at the center of the intermediate wall. It is possible to move the intermediate wall by rotating the screw member by penetrating a screw member such as the above and providing a nut member on the intermediate wall.

  Further, according to one form of the buoyancy adjusting device for scuba diving according to the present invention, the nut member of the intermediate wall is required to be airtight, but as an effective solution, the inner diameter portion is matched to the external shape of the screw member. The sealing member formed by the cylindrical soft material is loaded into the sealing member receiving portion formed slightly larger than the outer shape of the sealing member provided in the central portion of the intermediate wall, and the sealing member is passed through the screw member. Is compressed by applying an appropriate load from above and below in the vertical direction, so that the gap between the screw member and the intermediate wall is eliminated and airtightness is maintained.

  Further, according to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, the position of the intermediate wall is substantially the same in the two cylindrical members as the buoyant bodies, and when the intermediate wall is moved, If the position is not the same, the balance of buoyancy applied to the diver is not balanced, making it difficult to use. For this reason, it is necessary to move the intermediate wall in two cylinders simultaneously by one operation. In order to solve this problem, a transmission member such as a gear or a toothed belt and a toothed pulley and a screw member penetrating the center of the two cylinders by the rotation shaft can be simultaneously turned.

  Further, according to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, the screw member is made to pass through with a small offset from the center of the intermediate wall, and the weight is reduced while preventing the rotation of the intermediate wall due to the rotation of the screw member. It can be characterized by the simplification of the structure.

  According to one embodiment of the buoyancy adjusting device for scuba diving according to the present invention, there is no buoyancy fluctuation even when the diving depth is changed, and the buoyancy adjustment is easy and light weight is obtained.

It is a perspective view which shows the example of a form of the buoyancy adjustment apparatus for scuba diving which concerns on this invention. It is a perspective view from the front of the example of a form of FIG. It is a rear view of the example of a form of FIG. It is AA sectional drawing in FIG. 3 of the example of a form of FIG. It is sectional drawing in the air supply apparatus of the example of a form of FIG. It is operation | movement explanatory drawing in the air supply apparatus of the example of FIG. It is sectional drawing of the exhaust valve in the intermediate wall of the example of FIG. It is BB sectional drawing in FIG. 4 of the example of a form of FIG. It is a top view of the intermediate wall of the example of a form of FIG. In the buoyancy body of the form example of FIG. 1, it is sectional drawing in Example 2. FIG. In the buoyancy body of the example of FIG. 1, it is a rear view including the fragmentary sectional view which shows the example of the form which obstruct | occluded the lower end airtightly.

  It consists of a back plate and a belt member for fixing the scuba diving air tank to the diver's body, and a pair of cylindrical members as buoyancy bodies are fixed to both sides of the tank on a part of the stay protruding from the back plate It is arranged so that the diver can carry with the air tank.

  A cylinder formed of a hard material as a buoyant body is hermetically closed at its upper or lower end, and forms a substantially piston-shaped intermediate wall that moves in the middle, and the effective volume of the cylinder is moved by moving the position of the intermediate wall. The buoyancy can be varied by varying the. Since the formed member is a hard material, the volume in the buoyancy body is not changed by changing the depth. Therefore, even if the diver's depth fluctuates, the buoyancy does not change.

  Further, as the depth increases, the pressure applied to the buoyant body increases. To counter this, the buoyant body and its constituent members must be formed with sufficient strength, but this increases the weight. Furthermore, when the intermediate wall is moved in order to increase buoyancy, the effective volume of the buoyancy body increases and the internal pressure becomes negative. In order to prevent this, an air supply device similar to a respiratory second stage regulator is provided to supply air from the diving air tank.

  Moreover, when the depth decreases, the pressure applied to the buoyancy body decreases. In some cases, it can be assumed that the internal pressure is higher than the ambient pressure. For this reason, it is preferable to provide an exhaust valve with a one-way valve on the intermediate wall or the end face of the buoyant body that is hermetically closed and in the vicinity thereof so as to discharge excess air. If this exhaust valve is provided on the intermediate wall when the upper end of the cylindrical member is closed, and provided on the lower end surface when the lower end is closed, there is an advantage that water entering the air chamber can be easily discharged in a standing posture.

  More specifically, by setting the air supply mechanism and the exhaust valve so that the internal pressure of the buoyancy body is maintained between −1 kPa and 4 kPa with respect to the ambient pressure, the buoyancy body is affected by changes in depth. Since no excessive pressure is applied, the constituent members can be made thin and light. For these reasons, components such as buoyancy bodies and intermediate walls may be made of plastic, and the seal between the intermediate wall and the cylindrical inner wall, which is a buoyancy body, can be a lip-shaped seal made of a soft material. There is an advantage that the necessary force can be reduced. It should be noted that the above effect can be expected by maintaining the pressure range of the internal pressure of the buoyancy body at ± 100 kPa or less.

  In order to stabilize the diver's posture in water, it is desirable to provide buoyancy bodies on the left and right pair of air tanks. In addition, this makes it easy to obtain the buoyancy as a buoyant body necessary when the diver encounters the maximum buoyancy and drifts on the sea surface. Further, in the above buoyancy body, by using a buoyancy body in which the lower end surface of the cylindrical member is hermetically closed, the position of the buoyancy body is close to the position of the diving weight attached to the waist by the diver, and the posture of the diver is further stabilized. In addition to the effect, excess air staying inside the cylindrical portion can be effectively discharged upward.

  The buoyancy can be changed by moving the intermediate wall. To reduce the overall size of the device, a screw member such as a multi-thread screw is passed through the center of the intermediate wall and a nut member is provided on the intermediate wall. The intermediate wall can be moved by the rotation of the screw member. According to this, the rod does not protrude to one side unlike a normal cylinder mechanism in which a piston or the like is moved from the outside by a rod.

  In this case, the nut member of the intermediate wall is required to be airtight. However, as an effective solution, a sealing member made of a cylindrical soft material whose inner diameter portion is formed in accordance with the external shape of the screw member is used. After loading the seal member receiving part formed slightly larger than the outer shape of the seal member provided in the central part and passing through the screw member, the seal member is compressed by applying an appropriate load from above and below in the vertical direction. The gap between the member and the intermediate wall is eliminated and the airtightness is maintained. When the friction due to the rotation of the screw is too large, the frictional force is reduced by reducing the force for compressing the seal member. As a result, the airtightness of the movable screw portion, which has been considered difficult in the past, has been achieved, and the overall size of the apparatus has been reduced.

  Further, in the two buoyancy bodies, the position of the intermediate wall is substantially the same, and if the position of the intermediate wall is not the same when the intermediate wall is moved, the balance of the buoyancy applied to the diver cannot be balanced and it is difficult to use. For this reason, it is necessary to move the intermediate wall in two buoyancy bodies simultaneously by one operation. In order to solve this problem, the screw member penetrating through the center of the cylinder, which is the two buoyant bodies, is rotated simultaneously by the gear and the rotating shaft.

  In addition, the screw member is rotated in order to move the intermediate wall in the cylinder which is a buoyant body. However, if the intermediate wall rotates simultaneously with the screw member at this time, the intermediate wall does not move. In order to solve this, for example, it is conceivable that another shaft-shaped member is penetrated at a position away from the center of the intermediate wall, and this shaft-shaped member is fixedly held at the upper and lower end members of the cylinder. In addition, airtightness between the shaft member and the intermediate wall must be ensured, and not only the sliding resistance by the seal member is increased, but if the parallelism with the screw member is poor, the sealing performance is deteriorated and the movement is deteriorated. .

  In order to solve this problem, the screw member is penetrated by being slightly offset from the center of the intermediate wall, and the weight reduction and the simplification of the structure are realized while preventing the rotation of the intermediate wall due to the rotation of the screw member. More specifically, a suitable operation is realized by penetrating the screw member with an offset of about 2 to 3 mm with respect to the inner diameter φ140 mm of the cylinder, which is a buoyancy body.

  In addition, as a method of constructing the airtight part of the buoyancy body, an airtight seal is provided between the inner surface of the cylindrical part and the intermediate wall. You may do it. According to this, the same effect is acquired, without comprising the airtight seal part between the cylinder inner side surface and intermediate wall in which surface accuracy and a shape system are requested | required. Since neither the internal pressure nor the external pressure exceeds a certain range for the bellows member, it is possible to use a relatively light and inexpensive member such as a molded product made of a resin material. Further, in the case of this form, the side of the cylindrical portion can be appropriately drilled to effectively discharge excess air that initially stays in the cylindrical portion at the start of diving.

  Moreover, in order to rotate a screw member as a means to move an intermediate | middle wall, the motor rotated by electricity or compressed air can be used. According to this, by arranging the switch mechanism at hand, not only a more comfortable operation can be realized, but also a safe diving can be realized for a handicapped person with a handicap. In addition, when a diver who has difficulty in walking dives with the wheelchair, the buoyancy adjusting device may be attached to a part of the wheelchair.

  Furthermore, the optimal buoyancy adjustment amount is calculated from the diver's water depth fluctuation information obtained by a pressure sensor, etc., and a considerable amount of rotation command is issued to the motor, so that the diving suit worn by the diver It is possible to keep buoyancy constant by automatically controlling buoyancy fluctuations due to depth, weight changes due to consumption of air tanks, and buoyancy changes due to samples collected from the seabed.

  Furthermore, the buoyancy body is formed in a cylindrical shape, one end face is hermetically closed, a screw member is arranged so as to penetrate the vicinity of the center portion, and a movable nut member that engages with the screw member is movable. A plate-shaped member is formed in the cylinder, and the plate-shaped member and the cylinder inner wall of the buoyant body are hermetically sealed by a seal member. By placing it below, the position of the buoyancy body and the weight for diving that the diver wears on the waist will be closer, and the posture of the diver will be more stable, and the excess air staying inside the cylindrical part will be upward It can be effectively discharged.

Embodiments of a buoyancy adjustment device for scuba diving according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a projection view of the first embodiment from an oblique rear side, and FIG. 2 is a projection view of the first embodiment from an oblique front side. One air tank used for scuba diving is fixed to the nine back plates of FIG. A pair of two buoyancy bodies are fixed to the nine back plates via 11 upper stays and 12 lower stays. Each two buoyancy bodies are connected by 10 bypass pipes and their internal pressures are kept equal.

  The diver carries the tank and the entire apparatus with six shoulder belts and is fixed with four abdominal belts (the belts are not shown in FIG. 2). Breathe in the water holding an 8-second stage regulator.

  A five air supply device is fixed to one of the two buoyancy bodies. The air supply device is supplied with air from a 1-air tank whose pressure has been reduced via a 7 first stage regulator. This air is also supplied to an 8-second stage regulator for breathing.

  Further, as shown in FIG. 3, 22 shafts are provided by 21 bearings on the bottom surface of each 2 buoyancy body, and 22 helical gears (small) in FIG. 4 are arranged on each 22 buoyancy body. Has been. The 22 helical gear (small) meshes with a 24 helical gear (large) fixed to the end of a 26 multi-threaded screw member provided so as to penetrate the center of the 2 buoyancy body. Further, 3 handles are provided on the 22 shaft, and the 26 multi-threaded screw member is rotated by rotating this.

  Since the buoyancy is equal to the volume of the buoyancy body minus the underwater weight of each component, the buoyancy of the entire device can be varied by varying the volume of the two buoyancy bodies. If the volume is constant, the buoyancy is constant without depending on the water depth.

  The two buoyant bodies in FIG. 4 are provided with a 28 top plate at the upper end, and the end surfaces thereof are fixed by 29O-rings while being kept airtight with the 2a buoyant body cylinder. A 27 bottom plate is disposed at the lower end of the two buoyancy bodies. The 27 bottom plate is provided with one or more holes 27a. Further, 31 intermediate walls are arranged inside the 2a buoyant body cylinder, and its peripheral part is kept airtight with the inner wall of the 2a buoyant body cylinder by a 32 lip seal.

  The intermediate wall 31 is provided with a 35 exhaust valve, which is a one-way valve that can exhaust the air in the 37 air chamber to the outside and does not allow water to enter from outside. In this valve structure, a 64 valve seat is held on the 63 valve body of FIG. 7 and is pressed against the 65 valve base by a 62 spring member. By varying the spring pressure with a 61 adjusting screw, the maximum internal pressure in the 37 air chamber can be adjusted. In the embodiment, it is set to around 4 kPa.

  The 31 intermediate wall has a 30 multi-thread nut member fixed to the central portion thereof. Further, a cylindrical 34-seal member made of a soft material formed by connecting it to the outer shape of the 25-multi-thread member is provided. The outer diameter of this seal member is constrained by the 31 intermediate wall, and the upper end is compressed with a 30 multi-thread screw nut member and the lower end is compressed with a 33 seal holding screw, thereby maintaining the air tightness of the 31 intermediate wall and the 25 multi-thread screw member. Get drunk. When the sliding friction between the 34 seal member and the 25 multi-threaded screw member is too large, both movement and airtightness can be secured by appropriately adjusting the 33 seal holding screw.

  As shown in FIG. 9, the 25-multi-thread member is offset from the center of the 2a buoyant body cylinder and 31 intermediate wall by a dimension c. Accordingly, the 31 intermediate wall can move in the 2a buoyancy body cylinder by the rotation of the 25 multi-thread screw member without an additional member for suppressing the rotation direction. More specifically, a suitable operation is realized by penetrating the screw member with an offset of about 2 to 3 mm with respect to the inner diameter φ140 mm of the cylinder, which is a buoyancy body.

  5 and 6 are cross-sectional views of the five air supply device. 50 cases of this air supply device communicate with 37 air chambers with 51 vents. When the ambient pressure becomes higher than the 37 air chamber, for example, due to an increase in water depth, the 45 pressure sensitive diaphragm pushes down the 44 lever, but at the same time moves the 41 valve seat carrier whose positional relationship is determined by the 42 nut. In order for the 45 pressure sensitive diaphragm to move, a 47a hole must be formed in a part of the 47 top cover, thereby allowing movement of external water to the 45 pressure sensitive diaphragm.

  Since the 41 valve seat carrier and the 44 lever move against the pressing force of the 43 spring member, the air supply start pressure is determined by this spring pressure. In the embodiment, it is set to 500 Pa to 1 kPa. That is, when the pressure in the 37 air chamber becomes negative by 500 Pa to 1 kPa from the surrounding pressure, the 44 lever is pushed down so that no further negative pressure is generated, creating a gap between the 46 valve seat and the 48 valve cone, and 49 low pressure Air is supplied through an air hose. (Fig. 6)

  When the diver feels that the buoyancy is insufficient, turn the 3 handle to move the 31 intermediate wall downward and increase the volume of the 37 air chamber to increase the buoyancy. At this time, the air chamber is supplemented with an appropriate amount of air from the five air supply devices. When the diver feels that the buoyancy is excessive, the 31 intermediate wall can be moved upward by turning the 3 handle in the opposite direction, and the volume of the 37 air chamber can be reduced to reduce the buoyancy. At this time, the excess air in the 37 air chamber is discharged from the 35 exhaust valve and discharged to the outside through the hole 27a. Since an actual diver is in a horizontal posture, there is no practical problem even if the hole 27a is at the lower end of the figure.

  FIG. 10 shows the same form as that of the first embodiment, but is different from the first embodiment only in the cross-sectional structure of the buoyancy body. According to this, the 71 intermediate wall and the 28 top plate are connected by 70 bellows. This eliminates the need for a lip seal for ensuring airtightness on the outer peripheral portion of the 71 intermediate wall. The 72 buoyant body cylinder is provided with a plurality of holes 72a, and the air discharged from the 35 exhaust valve does not stay due to the posture of the diver.

  The 70 bellows is made of a light and inexpensive material such as a resin material. This is because the pressure in the air chamber does not fluctuate beyond a certain range due to air supply and exhaust regardless of the diving depth, so that excessive pressure resistance characteristics are not required.

  FIG. 11 shows an embodiment (Embodiment 3) having the same components as those in Embodiments 1 and 2 described above, and having an end face that is airtightly closed below the standing posture of the diver. Yes. Constituent elements equivalent to those of the first and second embodiments are denoted by the same reference numerals and description thereof is omitted. Note that a toothed belt 81 and a toothed pulley 82 are provided as transmission members that simultaneously move the 31 intermediate walls of the two cylinders (2a buoyant body cylinder) by one operation.

  With the above configuration, it is possible to realize a buoyancy adjustment device for scuba diving that does not change buoyancy even when the diving depth changes, is easy to adjust buoyancy, is light and does not require special diving techniques.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 1 Air tank 2 Buoyant body 2a Buoyant body cylinder 3 Handle 4 Abdominal belt 5 Air supply device 6 Shoulder belt 7 First stage regulator 8 Second stage regulator 9 Back plate 10 Bypass pipe 11 Upper stay 12 Lower stay 21 Bearing 22 Shaft 23 Helical gear (small)
24 Helical gear (large)
25 Thrust bearing 26 Multi-thread screw member 27 Bottom plate 27a Hole (bottom plate)
28 Top plate 29 O-ring 30 Multi-thread screw nut member 31 Intermediate wall 32 Lip seal 33 Seal holding screw 34 Seal member 35 Exhaust valve 36 Bypass pipe joint 37 Air chamber 41 Valve seat carrier 42 Nut 43 Spring member 44 Lever 45 Pressure-sensitive diaphragm 46 Valve seat 47 Top cover 47a Hole (top cover)
48 Valve cone 49 Low pressure air hose 50 Case 51 Air port 60 Cover 61 Adjustment screw 62 Spring member 63 Valve body 64 Valve seat 65 Valve base 70 Bellows 71 Intermediate wall 72 Buoyant body side wall 72a Hole (buoyant body side wall)
81 Toothed belt 82 Toothed pulley

Claims (9)

  At least one buoyancy body having means capable of changing the effective volume by the diver's own operation, an air supply device that automatically supplies air from the air cylinder to the buoyancy body according to the ambient pressure, and the inside of the buoyancy body Automatic exhaust valve, a one-way valve that discharges excess air when the pressure rises, a variable mechanism that changes the volume of a buoyant body, a fixing means that fixes an air tank for scuba diving, and a band member that can be carried by a diver And a buoyancy adjustment device for scuba diving.   At least a pair of buoyancy bodies having means capable of changing the effective volume by the diver's own operation, an air supply device that automatically supplies air from the air cylinder to the buoyancy bodies according to the ambient pressure, and the interior of the buoyancy body An automatic exhaust valve that is a one-way valve that discharges excess air when the pressure rises, a connecting member that allows air to flow between the buoyant bodies, a manual variable mechanism that varies the volume of the buoyant bodies, and a scuba A scuba diving buoyancy adjustment device comprising a fixing means for fixing an air tank for diving and a band member that can be carried by a diver.   Regardless of the fluctuation of the ambient pressure of the buoyancy body, the pressure range set by the automatic air supply device and the automatic exhaust valve is maintained from the ambient pressure, and the pressure range is ± 100 kPa or less. The buoyancy adjustment device for scuba diving according to claim 1 or 2.   A movable plate-like member having a buoyant body formed in a cylindrical shape, one end face being hermetically closed, a screw member disposed so as to penetrate the vicinity of the center portion, and a nut member engaged with the screw member Is formed in the cylinder, and the plate-shaped member and the cylinder inner wall of the buoyant body are hermetically sealed by the seal member. The screw member and the movable plate-shaped member are also hermetically sealed by the seal member. The sealing member has a cylindrical shape, and the inner diameter portion is formed in the same shape as the outer diameter shape of the screw member, and the sealing member is compressed and held from both end surfaces and the outer peripheral surface to ensure airtightness with the screw member. The buoyancy adjustment device for scuba diving according to any one of claims 1 to 3, characterized in that:   The buoyancy body is formed in a cylindrical shape, provided in a plate-like member that is variable in position inside the cylindrical shape and whose outer periphery is airtightly held by a seal member, and a screw member and a plate-like member that penetrate the vicinity of the center. 5. The nut member according to claim 1, wherein the screw member and the nut member are arranged so as to be shifted from the center of the cylindrical shape, and the plate member moves without rotating by rotation of the screw member. The buoyancy adjustment apparatus for scuba diving in any one.   A plate-like member in which the side wall of the buoyancy body is formed in a bellows shape, a screw member passes through the center of the bellows-like buoyancy body, and one end surface of the bellows-like member is arranged so as to be movable in the direction of contraction of the bellows The other end face of the bellows is fixed to the buoyancy body top plate in an airtight manner, and a nut member that engages with the screw member is arranged at the center of the plate member that is movably arranged. The buoyancy adjusting device for scuba diving according to claim 1 or 2, wherein the screw member and the plate-like member are hermetically maintained by an airtight seal.   7. The buoyancy can be varied by rotating a screw member by means of an electric motor or a compressed air motor as a means for changing the volume of the buoyancy body and rotating the motor by a switch operation. A buoyancy adjustment device for scuba diving as described in Crab.   It is characterized by measuring changes in depth with a pressure sensor at regular intervals, calculating whether it is ascending or submerged and its speed, and automatically adjusting buoyancy fluctuations by issuing a command to rotate the specified rotation angle to the motor. The buoyancy adjustment device for scuba diving according to claim 7.   9. The buoyancy body is formed in a cylindrical shape, one end face is hermetically closed, and the hermetically closed end face is disposed below the standing posture of the diver. The buoyancy adjustment device for scuba diving as described in 1.

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