JP7433589B2 - Tank gathering device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tank gathering device.

In recent years, progress has been made in the development of fuel cell vehicles that run on electricity generated by fuel cells. In such automobiles, for example, it is being considered to arrange a hydrogen gas tank in the lower part of the floor of the passenger compartment (for example, Patent Document 1).

The tank aggregation device disclosed in Patent Document 1 has a port section 101 formed at one end of a plurality of small tanks 100 arranged in consideration of constraints on the arrangement space, as shown in FIG. are connected by a manifold 105, and the flow rate is adjusted by one valve (not shown). As shown in FIG. 12, the port section 101 and manifold 105 of each tank 100 have a female screw section 102 formed on the inner peripheral surface of a through hole formed inside the port section 101, and a female screw section 102 formed on the inner peripheral surface of a through hole formed inside the port section 101, and a It has a structure in which it is connected by screwing together a male threaded portion 107 formed on the outer peripheral surface of a cylindrical insertion portion 106 that is formed to protrude from the outside.

Further, a reinforcing layer is formed on the outer circumference of the tank to supplement the strength of the tank in the axial direction. This reinforcing layer is configured as a helical winding layer formed by winding the fiber bundle in a circumferential direction in an inclined state with respect to the tank.

JP 2019-32034 Publication

Although the tank gathering device disclosed in Patent Document 1 can save space and has excellent effects, there is a need for further space saving. In order to save space, it is conceivable to further reduce the outer diameter of the tank, for example, but if the outer diameter of the tank is simply reduced, the helical winding layer relative to the axis L of the tank will be There is a problem in that the inclination angle θ of the fiber bundle Z becomes large, and the strength of the helical winding layer itself, which is used to supplement the strength in the axial direction of the tank, decreases. Furthermore, in order to suppress a decrease in the strength of the helical winding layer itself caused by an increase in the inclination angle of the fiber bundle Z, it is necessary to increase the thickness of the helical winding layer, resulting in the problem of increased manufacturing cost.

In order to solve the above problem, it is possible to reduce the outer diameter of the tank as well as the outer diameter of the port, but if such a measure is adopted, the , the inner diameter of the female threaded part formed on the inner circumferential surface of the through hole inside the manifold becomes smaller, and in addition, the outer diameter of the male threaded part formed in the insertion part of the manifold also needs to be made smaller. This causes a problem in that the strength of the connection between the port section and the insertion section is significantly reduced. Further, due to the small inner diameter of the female threaded portion formed in the port portion, there arises a problem that it is difficult to form this female threaded portion.

The present invention has been made in order to solve such problems, and it is an object of the present invention to provide a tank gathering device that can effectively prevent a decrease in strength even if the outer diameter of the tank is further reduced. With the goal.

The object of the present invention is to provide a tank gathering device comprising a plurality of small-diameter tanks and a manifold to which each of the small-diameter tanks is connected, wherein each of the small-diameter tanks has a cylindrical body and an axis of the body. The tank body includes a first closing portion provided at one end in the direction, and a second closing portion provided at the other end in the axial direction of the body, the first closing portion protruding outward. It has a cylindrical first port part, and the first port part is provided with a first port communication hole that extends along the protrusion direction and communicates between the inside and the outside of the body part. , the manifold communicates a plurality of insertion portions into which each of the first port portions is inserted, an external communication flow path formed inside and communicating with the outside, and each of the insertion portions and the external communication flow path. A male threaded portion is formed on the outer circumferential surface of the first port portion, a female threaded portion is formed on the inner circumferential surface of the insertion portion, and the male threaded portion is formed on the inner circumferential surface of the insertion portion. Each of the small-diameter tanks is connected to the external communication flow path of the manifold by screwing the part and the female thread part, and the second closing part has a second cylindrical part that protrudes outward. The second port has a port portion, and the second port portion is provided with a second port communication hole that extends along the protrusion direction and communicates the inside and outside of the body portion, and the second port A male screw portion is formed on the outer peripheral surface of the portion, and a closing cap nut for closing the second port communication hole is screwed onto the male screw portion. The device further includes a supporting connecting member, and the connecting member includes a supporting portion into which the second port portion is inserted, and the supporting portion has a gap between it and the end face of the closing cap nut. This is achieved by a tank gathering device that is configured to include the following, and is capable of absorbing and supporting the axial expansion of each of the small-diameter tanks .

Further, in the tank gathering device, a reinforcing layer made of a helical winding layer of fiber bundles is provided on the outer surface of the tank body, and the helical winding layer is connected to the male screw part formed in the port part. It is preferable that the fiber bundle is wound up to the vicinity of the boundary position .

Further, the ratio (DP/DC) of the outer diameter dimension DP of each of the first port portion and each of the second port portion to the outer diameter dimension DC of the body portion may be 5/12 or less. preferable.

Preferably, the device further includes a sealing mechanism for sealing a connection point between the first port portion and the insertion portion.

Further, the sealing mechanism includes a fitting groove formed in an annular shape on the outer surface of the first port portion on the protruding direction end side of the male threaded portion, and a shaft seal mounted in the fitting groove. and an inner circumferential surface of the insertion portion.

Further, the sealing mechanism includes an annular opening fitting groove formed at an opening edge of the insertion portion, an end seal attached to the opening fitting groove, the first port portion and the first The first port may include an annular bulge formed in a boundary region with the closing part and surrounding the proximal end of the first port.

Further, an outer diameter dimension DC of the body portion of each of the small-diameter tanks may be 200 mm or less.

According to the present invention, it is possible to provide a tank gathering device that can effectively prevent a decrease in strength even if the outer diameter of the tank is further reduced.

FIG. 1 is a plan view of a tank aggregation device according to an embodiment of the present invention. 2 is a partially omitted schematic configuration cross-sectional view taken along the line AA in FIG. 1. FIG. FIG. 2 is a partially omitted schematic configuration sectional view of a small-diameter tank included in the tank aggregation device shown in FIG. 1. FIG. It is an explanatory view for explaining a reinforcing layer with which a small diameter tank is provided. FIG. 2 is a schematic cross-sectional view of a manifold included in the tank aggregation device shown in FIG. 1. FIG. FIG. 2 is a plan view showing a modification of the tank gathering device shown in FIG. 1; 7 is a sectional view taken along line BB in FIG. 6. FIG. 8 is an explanatory diagram illustrating another modification of the connecting member included in the tank gathering device shown in FIG. 7. FIG. FIG. 2 is a schematic cross-sectional view showing a modification of the manifold included in the tank aggregation device shown in FIG. 1. FIG. FIG. 2 is an explanatory diagram for explaining a modification of the tank gathering device shown in FIG. 1; FIG. 2 is a plan view for explaining a conventional tank gathering device. FIG. 2 is a schematic configuration cross-sectional view for explaining a connection structure between a tank and a manifold in a conventional tank collection device. FIG. 2 is an explanatory diagram for explaining the problem of the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that each figure is partially enlarged or reduced in order to facilitate understanding of the configuration. FIG. 1 is a plan view showing a tank aggregation device 1 according to an embodiment of the present invention, and FIG. 2 is a partially omitted schematic configuration cross-sectional view taken along the line AA. The tank assembly device 1 according to the present invention is, for example, a tank assembly device for storing and supplying hydrogen gas installed in a fuel cell vehicle that runs on electric power generated by a fuel cell, or a natural gas vehicle that runs on natural gas as fuel. As shown in FIG. 1, etc., it can be used as a tank collection device for storing and supplying natural gas installed in a tank, and as shown in FIG. It is composed of: Such a tank gathering device 1 can be arranged, for example, along the floor panel of a fuel cell vehicle or a natural gas vehicle on the lower side of the vehicle.

Each small-diameter tank 2 includes a cylindrical body 21 , a first closing part 22 provided at one end of the body 21 in the axial direction, and a second closing part 23 provided at the other end of the body 21 in the axial direction. The tank body 24 includes a tank body 24 having a tank body 24 and a reinforcing layer 25 provided so as to cover the outer surface side of the tank body 24. This small-diameter tank 2 is configured to withstand a pressure of about 70 MPa during use.

The first closing portion 22 and the second closing portion 23 included in each tank body 24 are configured to have a dome shape. The top portions of the first closing portion 22 and the second closing portion 23 formed in a dome shape are arranged on the axis of the body portion 21 (tank body 24). Further, as shown in the partially omitted schematic cross-sectional view of FIG. A similar cylindrical second port portion 27 is also formed. These first and second port portions 27 are each formed on the axis of the body portion 21 so as to protrude outward along the axial direction.

Further, a male threaded portion 28 is formed on the outer circumferential surface of the first port portion 26, and extends along the protruding direction of the first port portion 26, and connects the inside and outside of the body portion 21. A first port communication hole 29 is formed to communicate with the first port. Similarly, a male threaded portion 30 is formed on the outer peripheral surface of the second port portion 27, and extends along the protruding direction of the second port portion 27. A second port communication hole 31 is formed to communicate with the second port. A closing cap nut 32 for closing the second port communication hole 31 is screwed onto the second port portion 27 .

Further, the ratio (DP/DC) of the outer diameter dimension DP of each first port section 26 (each second port section 27) to the outer diameter dimension DC of the body section 21 is "3/20" or more. It is preferable to configure it so that it is 5/12" or less. Further, the outer diameter dimension DC of the body portion 21 is preferably 120 mm or more and 200 mm or less, and more preferably 120 mm or more and 150 mm or less. The outer diameter dimension DP (maximum outer diameter dimension) of the first port portion 26 is preferably 30 mm or more and 50 mm or less.

Here, the material constituting each tank body 24 is not particularly limited, but is preferably made of metal, for example. The metal tank body 24 is formed, for example, by spinning a pipe or plate made of aluminum alloy or steel into a container shape, and then forming the first and second port portions 26 and 27 into shapes. Examples include those that form.

The reinforcing layer 25 is formed by wrapping fibers 10 pre-impregnated with a curable resin around the outer surface of the tank body 24. Details of the structure of the reinforcing layer 3 will be described later.
It is formed by winding a fiber bundle pre-impregnated with a curable resin and curing the curable resin. As shown in FIG. 4, an example of such a reinforcing layer 25 is a helical-wound layer formed by winding a fiber bundle Z in an inclined state with respect to the tank body 24 so as to surround it in the circumferential direction. I can do it. The helical winding layer mainly has the function of supporting the tank body 24 in the axial direction. The fiber bundle Z of the helical winding layer is wound so as to be inclined with respect to the axis L of the tank body 24 when viewed from the radial direction of the tank body 24. The inclination angle θ with respect to the axis L is preferably set in a range greater than 0° and less than 30°. In addition, in the helical winding layer, the fiber bundle Z is wound in a cross-crossing manner from one dome-shaped end of the tank body 24 to the other dome-shaped end. Note that when forming a helical winding layer, one single layer is formed by covering the outer peripheral surface of the tank body 24 with the fiber bundle Z, and then the fiber bundle Z is wound on top of the single layer to form an additional single layer. Form. By forming a plurality of such single layers, a helically wound layer is formed. The number of single layers in the helical winding layer is preferably set to about 2 to 20.

Further, as the reinforcing layer 25, in addition to the helical winding layer of the fiber bundle described above, a hoop winding layer (not shown) having a function of mainly supporting the tank body 24 in the radial direction may be adopted. The hoop layer is a layer formed by winding a fiber bundle around the tank body 24 in the circumferential direction. At this time, the fiber bundle of the hoop-wound layer is wound so as to be substantially perpendicular to the axis L of the tank body 24 when viewed from the radial direction of the tank body 24. Note that when forming the hoop-wound layer, one single layer is formed by covering the outer peripheral surface of the tank body 24 with a fiber bundle, and then another single layer is formed by winding the fiber bundle on top of that single layer. . A hoop-wound layer is formed by forming a plurality of such single layers. The number of single layers in the hoop-wound layer is preferably set to about 1 to 10.

Note that the reinforcing layer 25 may be configured by combining the above-described helical winding layer and hoop winding layer.

Here, the number of fibers (filaments) in the fiber bundle is not particularly limited, but is in the range of 1,000 to 50,000 filaments, preferably 3,000 to 30,000 filaments. In addition, if the number of fibers in the fiber bundle is less than 1,000 filaments, the content of thermosetting resin contained in the fibers may decrease, and if it exceeds 50,000 filaments, the fibers will become thick and difficult to wind. .

As the cured resin impregnated into the fibers, it is preferable to use a thermosetting resin that cures with heat. Types of curable resins that cure with heat include phenolic resins, urea resins, unsaturated polyester resins, vinyl ester resins, polyimide resins, bismaleimide resins, polyimide resins, polyurethane resins, diallyl phthalate resins, epoxy resins, Examples include, but are not limited to, melamine resin and allyl resin. In addition, examples of the curing agent added to the curable resin that cures with heat include aliphatic amines such as ethylenediamine, aliphatic polyamines such as diethylenetriamine, aromatic amines such as metaphenylenediamine or diaminodiphenylsulfone, piperidine or diazapine. Examples include primary and tertiary amines such as cycloundecene, and acid anhydride curing agents such as methyltetrahydrophthalic anhydride.

Further, examples of the fibers constituting the reinforcing layer 25 include carbon fibers, glass fibers, aramid fibers, boron fibers, polyethylene fibers, steel fibers, Zylon fibers, vinylon fibers, etc., especially those with high strength and high elastic modulus. Carbon fiber, which is also lightweight, may be used.

The manifold 5 is a member that has the function of consolidating and connecting a plurality of small-diameter tanks 2, and as shown in FIG. 5, which is a schematic cross-sectional view along the longitudinal direction, includes a manifold body 51 in the shape of a long bar. There is. This manifold main body 51 includes a plurality of insertion portions 52, an external communication channel 53, and a plurality of internal communication holes 54. In this embodiment, the manifold main body 51 is configured to have a prismatic shape, but is not particularly limited to such a shape, and may be configured to have a cylindrical shape, for example.

Each insertion portion 52 is a portion into which the first port portion 26 of each small-diameter tank 2 is inserted, and is arranged at predetermined intervals along the longitudinal direction of the manifold body 51. These insertion portions 52 are configured as holes formed in the side surface of the manifold body 51. Note that the insertion portion 52 is configured such that the depth of the insertion portion 52 is approximately the same as the length of the first port portion 26 in the protruding direction. A female threaded portion 55 is formed on the inner circumferential surface of each insertion portion 52, and by screwing the male threaded portion 28 of the first port portion 26 of the small diameter tank 2, each small diameter tank 2 can be inserted into a single unit. It is configured so that it can be connected to one manifold 5.

The external communication channel 53 is formed inside the manifold body 51 so as to extend along the longitudinal direction of the manifold body 51. The external communication channel 53 is configured to open at one end side 51a of the manifold body 51 and communicate with the outside. Note that in this embodiment, the external communication channel 53 is configured to have a structure that is not open at the other end of the manifold body 51.

Each internal communication hole 54 is formed inside the manifold body 51 and functions as a flow path that communicates each insertion portion 52 and the external communication flow path 53. In this embodiment, each internal communication hole 54 is formed so that its longitudinal direction is perpendicular to the longitudinal direction of the manifold body 51.

Further, a sealing mechanism is provided to prevent hydrogen gas or natural gas from leaking to the outside from the connection point between the first port section 26 and the insertion section 52. This sealing mechanism includes a fitting groove 33 that is annularly carved on the outer surface of the first port portion 26 on the tip end side in the protruding direction from the male threaded portion 28, and a shaft such as an O-ring that is attached to the fitting groove 33. It is composed of the seal 34 and the inner circumferential surface of the insertion portion 52. The sealing mechanism is configured so that when the first port section 26 is installed in the insertion section 52, the shaft seal 34 can be crimped between the fitting groove 33 and the inner peripheral surface of the insertion section 52.

Similarly, a sealing mechanism is provided between the outer circumferential surface of the second port portion 27 and the inner circumferential surface of the closing cap nut 32 to prevent hydrogen gas or natural gas from leaking to the outside. There is. The specific configuration of the sealing mechanism can be similar to that of the first port section 26 described above.

Here, a valve for flow rate adjustment is connected to the open end of the external communication channel 53 that is open at one end side 51a of the manifold body 51.

By employing the above-described configuration, the tank aggregation device 1 according to the present invention fixes one axial end (first port portion 26) of each small-diameter tank 2 to the manifold 5, and also The inside and outside (valve) of the tank body 24 are communicated with each other via the external communication channel 53, the internal communication hole 54, and the port communication hole 29 of the first port portion 26.

The tank gathering device 1 according to the present invention has a male threaded portion 28 formed on the outer peripheral surface of the first port portion 26 of each small-diameter tank 2, and an inner threaded portion 52 of the manifold 5 into which the port portion 26 is inserted. Although it is configured to form a female threaded portion 55 on the circumferential surface, because of this configuration, the outer diameter of the tank body 24 is reduced for further miniaturization, and the inclination angle of the fiber bundle is reduced. Even when the outer diameter (maximum outer diameter) of the first port portion 26 is made smaller in order to prevent the strength of the helical winding layer from decreasing due to an increase in the Since the screwing structure between the portion 26 and the insertion portion 52 can be configured to be large, the connection state between the first port portion 26 and the insertion portion 52 (each small diameter tank 2 and the manifold 5) can be stably and strong. This makes it possible to improve the connection strength of the connection portion between the first port section 26 and the insertion section 52 (each small-diameter tank 2 and the manifold 5). In addition, since the male threaded portion 28 is formed on the outer circumferential surface of the first port portion 26 to constitute a connection means with the manifold 5, the inside of the first port portion 26 is The workability of forming the connection means with the manifold 5 can be improved compared to the case of forming a female threaded portion.

In other words, the tank assembly device 1 according to the present invention meets the demand for further reducing the outer diameter of the small-diameter tank 2, and minimizes the inclination angle of the fiber bundle of the helical winding layer with respect to the axis L of the small-diameter tank 2. The first requirement is to prevent the strength of the helical winding layer itself for supplementing the axial strength of the small diameter tank 2 from decreasing, and the desire to reduce manufacturing costs without increasing the thickness of the helical winding layer. The present invention satisfies both the requirements for improving the connection strength between the first port section 26 and the insertion section 52, and the requirement for easily forming a connection structure between the first port section 26 and the insertion section 52. becomes possible.

Further, in this embodiment, a sealing mechanism is provided to seal between the outer circumferential surface of the first port portion 26 of each small-diameter tank 2 and the inner circumferential surface of each insertion portion 52 in the manifold 5. There is. By adopting such a configuration, it is possible to form a wide sealing area, and it is possible to effectively suppress hydrogen gas and natural gas from leaking from the connecting portion between the small-diameter tank 2 and the manifold 5. It becomes possible. In particular, in the first port portion 26, a fitting groove 33 is formed in an annular shape on the outer surface of the male screw portion 28 on the tip side in the protruding direction, and the shaft seal 34 is installed in the fitting groove 33. By adopting a configuration that seals between the outer circumferential surface of the first port section 26 and the inner circumferential surface of each insertion section 52 in the manifold 5, it is possible to prevent the shaft seal 34 from falling off from the first port section 26. It is possible to effectively suppress the leakage of hydrogen gas and natural gas while preventing the leakage of hydrogen gas and natural gas.

Although the tank aggregation device 1 according to one embodiment of the present invention has been described above, the specific configuration of the tank aggregation device 1 is not limited to the above embodiment. In the above embodiment, the second closing part 23 of the tank body 24 is configured to include the second port part 27, but the tank body 24 is arranged so as not to form such a second port part 27. It can also be configured.

Further, in the above embodiment, the shapes of the first and second port portions 27 are formed after the container shape is formed by spinning processing or the like from a pipe shape or plate shape made of aluminum alloy or steel. exemplifies the method of configuring each tank body 24, but the method of forming the tank body 24 is not particularly limited to such a method. The tank body 24 may be formed by joining the first closing part 22 and the second closing part 23, which are formed separately. Note that the first and second port sections 26 and 27 provided in the first closing section 22 and the second closing section 23 are connected at a stage before joining the first closing section 22 and the second closing section 23 to the body section 21. Alternatively, it may be formed after bonding. Further, each tank body 24 may be made of resin. The tank body 24 made of resin is made of a thermoplastic resin such as high-density polyethylene that is formed into a container shape by rotary molding or blow molding, and first and second port parts 26 and 27 made of metal are attached to the resin tank body 24. It can be formed by attaching.

Moreover, in this embodiment, as shown in the plan view of FIG. 6, you may comprise so that the connection member 6 which connects and supports the 2nd closure part 23 side of each small diameter tank 2 may be provided. The connecting member 6 includes a long rod-shaped connecting member main body 61, and the connecting member main body 61 is provided with a support portion 62, as shown in FIG. 7, which is a BB cross-sectional view of FIG. . This support portion 62 is a portion into which the second port portion 27 with the closing cap nut 32 of each small-diameter tank 2 is inserted, and is arranged at predetermined intervals along the longitudinal direction of the connecting member main body 61. ing. Each support portion 62 is configured as a hole formed in the side surface of the connecting member main body 61. Although the connecting member main body 61 is configured to have a prismatic shape, it is not particularly limited to such a shape, and may be configured to have a cylindrical shape, for example. By having such a connecting member 6, the second closed portion 23 side of each small-diameter tank 2 is stably supported, so that unexpected external force is not applied to the connection point between the first port portion 26 and the insertion portion 52. It is possible to effectively suppress the occurrence of damage. In addition, a gap is provided between the inner bottom surface 62a of the support portion 62 formed as a hole and the end surface 32a of the cap nut 32 for closure, so that the inner bottom surface 62a of the support portion 62 formed as a hole and the end surface 32a of the cap nut 32 for closure are provided. It is preferable that two port portions 27 be inserted. By adopting such an arrangement structure, even if each small-diameter tank 2 stretches in the axial direction when hydrogen gas or natural gas is stored in each small-diameter tank 2, the expansion can be stabilized. It is possible to absorb and support the

Moreover, various configurations can be adopted as the configuration of the connecting member 6. For example, as shown in FIG. 8, the connecting member 6 is configured so that the male threaded portion 28 of the second port portion 27 can protrude from the support portion 62, and the protruding male threaded portion 28 is closed. While closing the second port portion 27 by screwing the closing cap nut 32, the end surface of the closing cap nut 32 is pressed against the surface of the connecting member 6, and the connecting member 6 is pressed against the tank body 24 side. may be configured. When adopting such a configuration, it is possible to achieve strong integration between the connecting member 6 and the second closing portion 23 side of each small-diameter tank 2, and the rigidity of the tank gathering device 1 as a whole can be increased. .

Further, in the above embodiment, a structure is adopted in which the external communication channel 53 of the manifold 5 is not open at the other end side 51b of the manifold main body 51, but the structure is not particularly limited to such a structure. For example, as shown in the schematic cross-sectional view of FIG. 9, a configuration is adopted in which the external communication channel 53 is opened at the other end side 51b of the manifold body 51, and the open end at the other end side 51b is connected to another manifold. 5 may be provided. Such a connecting portion 56 can be configured, for example, as a hole-shaped portion having a female threaded portion at the other end 51b of the manifold body 51. The connection parts 56 formed in each manifold 5 are connected to each other via a connection member (not shown) having a communication hole therein, so that the inside of each small-diameter tank 2 in the plurality of tank collection devices 1 is and the outside (valve) are communicated.

Further, in the above embodiment, the shaft is used as a sealing mechanism to prevent leakage of hydrogen gas or natural gas from between the outer circumferential surface of the first port portion 26 and the inner circumferential surface of the insertion portion 52 in the manifold 5. Although it is configured to include a seal 34, it is not particularly limited to such a sealing mechanism. For example, the sealing mechanism may be configured using an end seal 41 as shown in FIG. Specifically, an annular opening fitting groove 40 is formed at the opening edge of the insertion portion 52 of the manifold 5, a ring-shaped end face seal 41 is attached to the opening fitting groove 40, and a first An annular bulge 42 that surrounds the proximal end of the first port 26 is formed in the boundary area between the port 26 and the first closing part 22, and the first port 26 is connected to the insertion part 52. The sealing mechanism is configured so that the end face seal 41 can be crimped between the opening fitting groove 40 and the bulging part 42 when installed. Note that either one of the sealing mechanism using the shaft seal 34 and the sealing mechanism using the end face seal 41 may be employed, or both may be used in combination.

1 Tank gathering device 2 Small diameter tank 21 Body part 22 First closing part 23 Second closing part 24 Tank body 25 Reinforcement layer 26 First port part 27 Second port part 28 Male screw part 29 First port communication hole 30 Male screw part 31 Second port communication hole 32 Closing cap nut 33 Fitting groove 5 Manifold 51 Manifold main body 52 Insertion part 53 External communication channel 54 Internal communication hole 55 Female thread part 6 Connecting member 61 Connecting member main body 62 Support part

Claims (7)

A tank gathering device comprising a plurality of small diameter tanks and a manifold to which each of the small diameter tanks is connected,
Each of the small-diameter tanks has a cylindrical body, a first closing part provided at one end of the body in the axial direction, and a second closing part provided at the other end of the body in the axial direction. It is equipped with a main body,
The first closing part has a cylindrical first port part that projects outward,
The first port portion includes a first port communication hole that extends along the protrusion direction and communicates the inside and outside of the body portion,
The manifold includes a plurality of insertion portions into which the respective first port portions are inserted, an external communication flow path formed inside and communicating with the outside, and an interior portion that communicates with each of the insertion portions and the external communication flow path. Equipped with a communication hole,
A male threaded portion is formed on the outer peripheral surface of the first port portion, a female threaded portion is formed on the inner peripheral surface of the insertion portion, and a screw thread between the male threaded portion and the female threaded portion is formed. Depending on the case, each of the small diameter tanks is communicatively connected to the external communication flow path of the manifold,
The second closing part has a cylindrical second port part that projects outward,
The second port portion extends along the protrusion direction and includes a second port communication hole that communicates the inside and outside of the body portion,
A male screw portion is formed on the outer peripheral surface of the second port portion, and a closing cap nut for closing the second port communication hole is screwed onto the male screw portion,
further comprising a connecting member that supports each of the second port portions,
The connecting member includes a support portion into which the second port portion is inserted,
The tank is characterized in that the support part is configured to have a gap between it and the end face of the closure cap nut, and is capable of absorbing and supporting the axial extension of each of the small-diameter tanks. Collection device. A reinforcing layer made of a helically wound layer of fiber bundles is provided on the outer surface of the tank body,
2. The tank assembly device according to claim 1, wherein the helical winding layer is configured by winding a fiber bundle up to the vicinity of a boundary position of the male screw portion formed in the port portion. The ratio (DP/DC) of the outer diameter dimension DP of each of the first port section and each of the second port section to the outer diameter dimension DC of the body section is 5/12 or less. The tank gathering device according to claim 1 or 2 . The tank gathering device according to any one of claims 1 to 3 , further comprising a sealing mechanism that seals a connection point between the first port part and the insertion part. The sealing mechanism includes a fitting groove that is annularly carved on the outer surface of the first port portion on the tip side in the protruding direction from the male threaded portion, a shaft seal that is attached to the fitting groove, and the insertion groove. 5. The tank gathering device according to claim 4 , wherein the tank gathering device comprises an inner circumferential surface of the portion. The sealing mechanism includes an annular opening fitting groove formed at the opening edge of the insertion portion, an end seal attached to the opening fitting groove, the first port portion, and the first closing portion. 5. The tank collecting device according to claim 4, further comprising an annular bulge formed in a boundary region between the first port portion and the first port portion and surrounding the proximal end portion of the first port portion. 7. The tank gathering device according to claim 1, wherein an outer diameter DC of the body of each of the small-diameter tanks is 200 mm or less.

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