JP5893602B2 - Expansion device, valve and gripping device - Google Patents

Description

  The present invention relates to an expansion device, a valve, and a gripping device.

  In Patent Document 1, a metal cylinder, a cylindrical elastic body that is open at both ends, and a caulking ring are formed. A closed space is formed between the metal cylinder and the outer peripheral surface of the cylinder. There is disclosed a gripping device that includes a stretchable bag body that is formed and expands and contracts when fluid is supplied and discharged.

  Patent Document 2 discloses a metal base, an elastic body that is fixed by crimping rings at both ends of the outer peripheral surface of the base, and an air supply / exhaust port formed on the base and an inner side of the elastic body. And a gripping device provided with an air passage through which air flows into the elastic body.

JP 2009-172729 A JP 2011-115880 A

  However, in the conventional example described above, when used as a gripping device in an environment exposed to corrosive fluid, the metal cylinder or the base or the caulking ring is eroded by the fluid, causing air leakage.

  Also, when used as an exhaust valve in an environment exposed to corrosive fluids, the metal cylinder or base or crimping ring is eroded by the fluid, and the space between the elastic body (tube) and the metal base or base is lost. It causes air leakage from the gap.

  In view of the above problems, an object of the present invention is to provide an expansion device that can be used stably even in an environment exposed to a corrosive fluid.

An apparatus as set forth in claim 1 of the present invention includes a substrate outer peripheral surface is formed, have covering the tip portion of the base body, a cover member outer peripheral surface of the same diameter as the outer peripheral surface is formed The first part over the entire circumference of the central part of the outer peripheral surface of the base body, the second part over the entire outer periphery of the base part on the outer peripheral surface side, and the entire outer peripheral surface of the cover member adjacent to the second part. to form a sealed region sealed by the said base by close contact with the third site over the circumference, a cylindrical tubular body that expands by the gas is the air supply, is disposed in the airtight area, A crimping member that crimps the cylinder over the entire circumference in the circumferential direction of the cylinder from the opposite side of the second part and the third part across the cylinder .

An apparatus as set forth in claim 2 of the present invention, in the expansion device of claim 1, wherein the substrate includes a first opening Pneumatic fluid passes, are connected through a passage to the first opening, the outer periphery and a second opening provided between the first portion and the second portion in the plane, the tubular body, the gas being air supply from said first opening from said second opening It expands when exhausted.

  The cylindrical body of the expansion device is in close contact with the second part over the entire outer peripheral surface tip side of the base and the third part over the entire outer peripheral surface of the cover member adjacent to the second part. When the gas is inhaled, it expands. For this reason, since the said expansion | swelling apparatus is suppressed in the 2nd site | part corrosion even in the environment exposed to corrosive fluid, it can be used stably.

  With the above configuration, the expansion device is improved in adhesion at the second part and the third part by the caulking member.

A valve according to a third aspect of the present invention includes the expansion device according to the first or second aspect and a support member that supports the expansion device in a flow path, and inflates or expands the cylinder of the expansion device. By contracting, the flow rate of the fluid passing through the flow path is adjusted.

By providing the expansion device according to claim 1 or 2 , the valve suppresses corrosion of the second part or the third part even if the fluid passing through the flow path is a corrosive fluid. Can be used stably.

A gripping device according to a fourth aspect of the present invention includes the expansion device according to the first or second aspect and a support member that supports the expansion device, and expands or contracts the cylindrical body of the expansion device. Then, the cylindrical body is pressed against the inner wall surface of the cylindrical member.

By providing the configuration of the expansion device according to claim 1 or 2 , the gripping device can be used stably even in an environment exposed to a corrosive fluid.

  According to the present invention, an excellent effect is obtained that it can be used stably even in an environment exposed to a corrosive fluid.

It is sectional drawing of the expansion | swelling apparatus which concerns on embodiment of this invention, Comprising: (A) is a schematic diagram of the state (state where the pressure in the sealed area | region of a bag body is low) which the bag body closed, (B) is a bag body. The schematic diagram of the open state (state in which the pressure in the sealed region of the bag body is high), and (C) are enlarged views of the region surrounded by the alternate long and short dash line in (B). It is sectional drawing of the expansion | swelling apparatus which concerns on the modification of embodiment of this invention, Comprising: (A) is a schematic diagram of the state (state in which the pressure in the sealed area | region of a bag body is low) with the bag body closed, (B) is The schematic diagram of the state which the bag opened (the state where the pressure in the sealed region of a bag is high), and (C) are the enlarged views of the field surrounded by the dashed-dotted line of (B). It is sectional drawing which shows the application example of the expansion apparatus which concerns on embodiment of this invention, Comprising: It is a schematic diagram at the time of applying the expansion apparatus which concerns on embodiment as a valve | bulb (1st Embodiment). It is sectional drawing which shows the application example of the expansion apparatus which concerns on embodiment of this invention, Comprising: It is a schematic diagram at the time of applying the expansion apparatus which concerns on embodiment as a grasping apparatus (2nd Embodiment).

<Overview>
The expansion device 10 of the present embodiment is used in an environment exposed to a corrosive fluid (see FIGS. 1A and 1B). Here, the corrosive fluid means a gas, liquid or other fluid that corrodes when contacted. For example, stainless steel (SUS316) is corroded when contacted with an acidic fluid (gas or liquid) as a corrosive fluid. In this case, the corrosive fluid in stainless steel becomes an acidic fluid. Iron is corroded even when it is contacted with an acidic fluid or a basic (alkaline) fluid. In this case, the corrosive fluid in iron is an acidic or basic fluid. The fluid includes those in an activated state such as ions.

  As a basic function of the inflating device 10, the gas is sucked into the sealed region 40 sealed by the base body 12 and the bag body 16 so as to expand (see FIGS. 1B and 1C). ). Further, as another basic function of the expansion device 10, the gas sucked into the sealed region 40 is contracted by being exhausted from the sealed region 40 (see FIG. 1A).

  And the expansion | swelling apparatus 10 can be used as a valve | bulb or a grasping apparatus in the environment exposed to corrosive fluid by having the said basic function (refer FIG.3 and FIG.4).

  In the following description, first, the configuration and operation of an expansion device 10 (hereinafter referred to as a valve 10) used as a valve will be described as a first embodiment. Next, a modification of the first embodiment will be described. Furthermore, as a second embodiment, the configuration and operation of an expansion device 10 (hereinafter, referred to as a gripping device 10) used as a gripping device will be described. In the description with reference to the drawings, the direction indicated by the arrow Y in FIGS. 1 to 3 is the upward direction, and the direction indicated by the arrow X is the horizontal direction. Further, a direction perpendicular to each of the upward direction and the lateral direction and directed from the near side to the far side is defined as a depth direction.

<First Embodiment (Valve)>
"Constitution"
As shown in FIGS. 1A and 1B, the valve 10 includes a base body 12, a first cover member 14, a second cover member 20, a bag body 16, and caulking members 18A and 18B. It is configured to include. When viewed from above, the bulb 10 has a substantially point-symmetrical circular shape with a portion (point) corresponding to its own axis L (a single-dot chain line) as a center. 1A and 1B are cross-sectional views taken along a virtual plane including the own axis L of the valve 10.

[Substrate]
<shape>
The substrate 12 is a member that is easily corroded in an environment exposed to an acidic or basic fluid. In the present embodiment, the base 12 is a metal member. 1A and 1B, an outer peripheral surface 52, an upper surface 50, and a lower surface 48 are formed on the base 12, and when viewed from above, a circular shape, a lateral direction (or When viewed from the depth direction, it is rectangular.

<First opening and second opening and passage>
As shown in FIGS. 1A and 1B, a round hole including its own axis L is formed from the upper surface 50 of the base 12. Further, a through hole that passes through the own axis L along the lateral direction is formed in the outer peripheral surface 52 of the base body 12. The round hole and the through hole are connected inside the base 12. The round hole and the through hole have an inverted T shape when viewed from the depth direction.

  Here, a portion where the round hole is formed on the upper surface 50 of the base 12 is defined as a first opening 30A. Further, a portion where the through hole is formed in the outer peripheral surface 52 of the base 12 is defined as a second opening 30C. Further, a region surrounded by the hole connecting the first opening 30A and the second opening 30C and the inner peripheral surface of the through hole is defined as a passage 30B.

  With the above configuration, when gas is sucked from the first opening 30A, the gas is discharged from the second opening 30C via the passage 30B. Further, when gas is sucked from the second opening 30C, the gas is discharged from the first opening 30A via the passage 30B.

<First part and second part>
As shown in FIGS. 1A and 1B, the outer peripheral surface 52 of the base body 12 and the upper portion of the second opening 30 </ b> C has a self-axis L direction (Y A bellows-shaped part (first part 42) along the direction) is formed. In addition, a bellows-shaped portion (second portion 44) along the own axis L direction is formed on the outer peripheral surface 52 of the base body 12 and on the lower portion of the second opening 30C along the entire axis L direction. Has been. In other words, on the outer peripheral surface 52 of the base 12, the first part 42 is formed in the upper part and the second part 44 is formed in the lower part, with the second opening 30 </ b> C interposed therebetween. In addition, the both ends of the bag 16 mentioned later are each closely_contact | adhered to the 1st site | part 42 and the 2nd site | part 44, respectively.

  In addition, the diameter of the outer peripheral surface 52 differs in the site | part in which the 1st site | part 42 was formed, and the site | part in which the 2nd site | part 44 was formed. Specifically, the diameter D1 of the part where the second part 44 is formed is smaller than the diameter D2 of the part where the first part 42 is formed (see FIG. 1A).

<Screw hole>
A screw hole 34 including its own axis L is formed from the lower surface 48 of the base 12 so as not to be connected to the through hole (or the passage 30B). A screw 32 formed in the first cover member 14 described later is fitted into the screw hole 34.

[First cover member]
The first cover member 14 is a member that is hardly corroded (or not corroded) in an environment exposed to an acidic or basic fluid. In the present embodiment, the first cover member 14 is a resin member. As shown in FIGS. 1A and 1B, the first cover member 14 is formed with an upper surface 60, an outer peripheral surface 64, and a conical surface 62, and a screw 32 is integrally formed. Is attached.

  Specifically, the upper surface 60 is a flat surface along the lateral direction, and is circular with a diameter D1 when viewed from above. The outer peripheral surface 64 is formed to extend downward from an outer edge portion of the upper surface 60 and is a curved surface having a diameter D1 with the own axis L of the base 12 as the center. Furthermore, the lower end of the outer peripheral surface 64 is the outer peripheral portion of the bottom surface, and the apex angle is a conical surface 62 facing downward. Here, the first cover member 14 is an example of a cover member. The screw 32 is attached to the upper surface 60 side so as to face upward from the upper surface 60 so that the center of the own axis coincides with the center of the upper surface 60.

  The first cover member 14 is fixed to the base 12 by screwing the screw 32 into the screw hole 34 of the base 12. In other words, the first cover member 14 covers the lower surface 48 of the base 12. And the outer peripheral surface 64 of the 1st cover member 14 fixed to the base | substrate 12 and the outer peripheral surface 52 of the base | substrate 12 are the states (state arrange | positioned on the same curved surface) which corresponded over the perimeter. . In other words, the outer peripheral surface 64 of the first cover member 14 is formed along the outer peripheral surface 52 of the base 12. Here, the lower surface 48 of the base 12 is an example of a tip portion of the base 12.

  Here, the site | part adjacent to the 2nd site | part 44 of the base | substrate 12 among the outer peripheral surfaces 64 of the 1st cover member 14 is called the 3rd site | part 46 (refer FIG. 1 (A) and (C)). And the edge part of the bag 16 mentioned later is closely_contact | adhered to the 3rd site | part 46 and the 2nd site | part 44. FIG. The third portion 46 is a portion that extends over the entire circumference of the outer peripheral surface 64 in the same manner as the first portion 42 and the second portion 44.

[Second cover member]
The second cover member 20 is a member that is hardly corroded (or not corroded) in an environment exposed to an acidic or basic fluid. In the present embodiment, the second cover member 20 is a resin member. As shown in FIGS. 1A and 1B, the second cover member 20 includes a cylindrical portion 20A, a lid portion 20B extending from the upper end of the cylindrical portion 20A, and a lower portion of the cylindrical portion 20A. And a projecting portion 20 </ b> D extending to the inner peripheral surface side at the direction end portion.

  The lid portion 20B has a circular shape when viewed from above. The lid 20 </ b> B is in contact with the upper surface 50 of the base 12 so that its own axis coincides with the own axis L of the base 12. Further, the inner peripheral surface of the cylindrical portion 20 </ b> A is separated from the outer peripheral surface 52 of the base 12.

  A through hole 20 </ b> C is formed at the center of the cylindrical portion 20 </ b> A of the second cover member 20. The inner diameter of the through hole 20C matches the inner diameter of the first opening 30A formed in the upper surface 50 of the base 12. A pipe (not shown) for transporting gas passing through the first opening 30A of the valve 10 is fixed in close contact with the through hole 20C. The protrusion 20D will be described later.

[Bag body and caulking member]
The bag body 16 is a belt-shaped member that is configured in a cylindrical shape and has elastic properties (see FIGS. 1A and 1B). In the present embodiment, the bag body 16 is formed of an elastic body (rubber). The bag body 16 is made of rubber that is hardly corroded (or not corroded) in an environment exposed to an acidic or basic fluid. As described above, one end of the bag body 16 is in close contact with the first portion 42 of the base 12, and the other end is in close contact with the second portion 44 of the base 12 and the third portion 46 of the first cover member 14. Here, the bag body 16 is an example of a cylindrical tube body.

  Specifically, a caulking member 18B is disposed on one end side of the bag body 16 and on the opposite side of the first portion 42 across the bag body 16. The caulking member 18B caulks one end side of the bag body 16 over the entire circumference, so that the one end side of the bag body 16 is in close contact with the first portion 42.

  A crimping member 18 </ b> A is disposed on the other end side of the bag body 16 on the opposite side of the second portion 44 and the third portion 46 with the bag body 16 interposed therebetween. When the crimping member 18A crimps the other end side of the bag body 16 over the entire circumference, the other end side of the bag body 16 is in close contact (see FIG. 1C).

  Both end sides of the bag body 16 are elastically deformed by being crimped by the crimping members 18A and 18B, and bite into the first part 42 and the second part 44 which are formed into a bellows shape (see FIG. 1C). ). Due to such a configuration, the second portion 44 of the base 12 does not directly touch the fluid outside the valve 10.

  Here, as shown in FIG. 1C, the surfaces of the bag body 16 pressed by the crimping members 18A and 18B are different from each other. In the bag body 16, when the surface pressed by the crimping member 18B is the outer surface, the surface pressed by the crimping member 18A is the inner surface. Then, both end sides of the bag body 16 are pressed by the caulking members 18A and 18B in a state where both end sides face the same direction (upward direction). For this reason, the caulking member 18 </ b> A is surrounded by the inner surface of the bag body 16 and the outer peripheral surface 52 of the base body 12. In other words, the caulking member 18 </ b> A is disposed in the sealed region 40 that is sealed by the base body 12 and the bag body 16. Due to such a configuration, the caulking member 18 </ b> A does not directly touch the fluid outside the valve 10.

  The outer peripheral surface side of the crimping member 18B (the side opposite to the side pressing the bag body 14) is in contact with the inner peripheral surface side of the second cover member 20 described above. Moreover, the downward direction edge part of the crimping member 18B is contacting the protrusion 20D extended in the 2nd cover member 20, and the outer surface of the bag body 16, as FIG.1 (C) shows. . Accordingly, the caulking member 18 </ b> B is disposed in a sealed region 54 that is sealed by the outer peripheral surface 52 of the base 12, the bag body 16, and the second cover member 20. Due to such a configuration, the caulking member 18 </ b> B does not directly touch the fluid outside the valve 10.

  Further, as described above, in the valve 10, when gas is sucked from the first opening 30 </ b> A through the pipe, the gas is further discharged from the second opening 30 </ b> C through the passage 30 </ b> B. ing. The gas exhausted from the second opening 30C is sent into the sealed region 40 to inflate the bag body 16 (see FIG. 1B). On the other hand, when the gas is exhausted to the outside of the valve 10 through the pipe, the gas in the sealed region 40 is exhausted from the second opening 30C, the passage 30B, and further from the first opening 30A. It is made to contract (refer FIG. 1 (A)). As the gas sucked into the valve 10, a gas existing in the atmosphere such as oxygen, nitrogen and argon can be used.

[Other components]
As shown in FIG. 3, the valve 10 serving as an expansion device is disposed inside a flow path 80 and supported by a support member 82. The channel 80 is a member having a circular inner peripheral surface when viewed from above. The flow path 80 is, for example, a discharge flow path that discharges an acidic or basic fluid, and the fluid is discharged along the direction of the arrow. And the cross-sectional area (area through which the fluid can pass) of the flow path 80 is changed by expanding or contracting the bag body 16 of the valve 10 disposed inside the flow path 80. That is, the flow path resistance with respect to the fluid can be adjusted by expanding or contracting the bag body 16 of the valve 10. The support member 82 supports the valve 10, and a passage for discharging gas to the valve 10 or sucking gas from the valve 10 is formed in the support member 82.

<< Operation of First Embodiment >>
Next, the effect | action of this embodiment is demonstrated, referring drawings.

  Here, it demonstrates, comparing with the comparative example demonstrated below. In addition, in the comparative example, when using the component etc. which were used by this embodiment, it demonstrates using the code | symbol of the component etc. as it is.

  In the valve (expansion device) of the comparative example, the other end side of the bag body 16 is crimped over the entire circumference by the crimping member 18A disposed on the opposite side of only the second portion 44 with the bag body 16 interposed therebetween. This is different from the valve 10 of the present embodiment in that it is in close contact. Other points are the same as in this embodiment.

  In the case of the valve of the comparative example, the third portion 46 of the first cover member 14 is not in close contact with the bag body 16 being crimped by the crimping member 18A, or has a weak adhesion. That is, in the case of the valve of the comparative example, the boundary portion between the outer peripheral surface 52 of the base 12 and the first cover member 14 is easily exposed to an external fluid as compared with the present embodiment. If it does so, when the valve | bulb of a comparative example is used in the environment exposed to an acidic or basic fluid, the boundary part with the 1st cover member 14 in the outer peripheral surface 52 of the base | substrate 12 may be eroded by these fluids. . For this reason, the caulking by the caulking member 18 </ b> A becomes unstable, and the gas in the bag body 16 may leak to the outside via the second portion 44. As a result, the function as a valve for adjusting the flow rate of the fluid discharged through the flow path 80 may become unstable.

  On the other hand, the valve 10 of the present embodiment is arranged on the opposite side of the second part 44 and the third part 46 with the bag body 16 in between, as shown in FIGS. 1 (A) to (C). The other end side of the bag body 16 is closely attached to the entire circumference by the crimping member 18A. For this reason, in the case of the valve 10, even when the valve 10 is used in an environment exposed to an acidic or basic fluid, the boundary portion between the fluid and the first cover member 14 on the outer peripheral surface 52 of the base body 12. Therefore, erosion by these fluids is suppressed.

  Therefore, according to the valve 10 of the present embodiment, as compared with the comparative example, even if the fluid passing through the flow path is an acidic or basic fluid, the pressing force (binding) of the bag body 16 by the caulking member 18A. Force) is stabilized. That is, the valve 10 can be used stably.

<Modification of First Embodiment>
Next, a modification of the first embodiment will be described with reference to FIGS. In the valve 10A of the present modification, a step portion (reference numeral omitted) is formed at the lower end of the base body 12A. Further, a protruding portion 14A1 facing upward is formed over the entire outer peripheral portion of the upper surface 60 of the first cover member 14A. The valve 10A is different in that the protrusion 14A1 is configured to fit into the stepped portion. Except for these points, the second embodiment is the same as the first embodiment.

  In the case of the valve 10A, the third portion 46 is formed on the outer peripheral surface of the protrusion 14A1 (see FIG. 1C). Then, as in the case of the first embodiment, the valve 10A is disposed on the opposite side of the second part 44 and the third part 46 with the bag body 16 in between, as shown in FIGS. The caulking member 18A that is arranged is in close contact by caulking the other end side of the bag body 16 over the entire circumference.

  The operation of the modification is the same as that of the first embodiment.

<Second embodiment (gripping device)>
Next, a second embodiment will be described with reference to the drawings. The gripping device 10 of the present embodiment is basically the same as the configuration of the valve 10 described above. The only difference is the application. In addition, in this embodiment, when using the components etc. which were used in 1st Embodiment (including the modification of 1st Embodiment), it demonstrates using the code | symbol of the components etc. as it is.

  The gripping device 10 is attached to the movable arm 92 and is supported at a predetermined position inside the cylindrical member 90 (see FIG. 4). Thereafter, the gripping device 10 supported at a predetermined position is configured such that the gas sucked from the first opening 30A is sent into the sealed region 40 and the bag body 16 is inflated. The inflated bag body 16 comes into pressure contact with the inner wall surface 94 of the cylindrical member 90 (see FIG. 4). As a result, the cylindrical member 90 is held by the gripping device 10, and the cylindrical member 90 is moved by moving the movable arm 92. Then, the bag body 16 is contracted, and the gripping device 10 is moved by the movable arm 92 to perform the same operation on another cylindrical member 90. Here, the movable arm 92 is an example of a support member.

  When the expansion device of the comparative example is used as a gripping device, when used in an environment exposed to an acidic or basic fluid, gas leaks from the sealed region 40 and the function as the gripping device is unstable. Can be.

  On the other hand, the gripping device 10 does not leak gas from the sealed region 40 or suppresses gas leakage even when used in an environment exposed to an acidic or basic fluid.

  Therefore, according to the grasping device 10 of the present embodiment, even when the expansion device of the comparative example is used in an environment exposed to an acidic or basic fluid, compared to the case where the expansion device is used as the grasping device. The pressing force (binding force) of the bag body 16 by the caulking member 18A is stabilized. That is, the gripping device 10 can be used stably.

  As described above, the present invention has been described based on specific embodiments, but the present invention is not limited to the above-described embodiments (including modifications), and various other implementations are within the scope of the present invention. Forms are possible.

  For example, although the expansion device 10 as a valve or a gripping device has been described as being used in an environment exposed to an acidic or basic fluid, it may be used in a normal environment (in the atmosphere).

  Further, although the fluid to which the expansion device 10 is exposed has been described as an acidic or basic gas, the fluid may be an acidic or basic liquid.

  Moreover, although the base | substrate 12 and the crimping members 18A and 18B which comprise the expansion apparatus 10 were demonstrated as metal, they should just be comprised with the material containing a metal. A mixed material in which a metal and a resin are mixed may be used. The base 12 and the caulking members 18A and 18B may be any material that corrodes in relation to the fluid in the environment where the expansion device 10 is used.

  Moreover, although the cover member 14 which comprises the expansion apparatus 10 was demonstrated as resin, the member which coat | covered (painted) the surface of the member made of metal or the said mixed material with resin may be sufficient.

  Moreover, although the diameter of the outer peripheral surface 52 of the base | substrate 12 of the expansion | swelling apparatus 10 demonstrated that the site | part in which the 1st site | part 42 was formed is larger than the site | part in which the 2nd site | part 44 was formed, the reverse or the same, Also good.

  In addition, although it has been described that the inner diameter of the through hole 20C of the second cover member 20 of the expansion device 10 matches the inner diameter of the first opening 30A of the base body 12, an opening for allowing intake or exhaust from the outside is formed. It only has to be done.

  Further, the bag body 16 in the expansion device 10 has been described as being in close contact with the outer peripheral surface 52 of the base body 12 by being crimped by the crimping members 18A and 18B. Members other than the members 18A and 18B may be used. For example, an adhesive, a wire member, or a combination thereof may be used.

  Further, the gripping device 10 has been described as having the same configuration as the valve 10 of the first embodiment, but may have the same configuration as the valve 10A of the modified example of the first embodiment.

  Further, as an application example of the inflating device 10, a valve and a gripping device have been illustrated and described. However, the inflating device 10 may be applied to an apparatus that can apply expansion or contraction of the bag body 16. For example, it is conceivable that the bag body 16 can be applied to construction, processing, etc. by expanding or contracting the bag body 16 in an environment where toxic gas is generated.

  Further, the first opening 30 </ b> A has been described as being formed on the upper surface 50 of the base 12, but may be formed on the outer peripheral surface 52 of the base 12. Further, the first opening 30A, the passage 30B, and the second opening 30C are not formed in the base body 12, but the bag body 16 is directly inhaled or exhausted to expand or contract the bag body 16. Also good.

  In addition, the first portion 42 and the second portion 44 have been described as having bellows-shaped portions. However, as long as the bag body 16 can be in close contact with the outer peripheral surface 52 of the base body 12, any shape can be used. There may be. That is, the shape (curved surface shape) may be the same as the portion other than the first portion 42 and the second portion 44 on the outer peripheral surface 52 of the base body 12 as long as the contact can be made.

DESCRIPTION OF SYMBOLS 10 Valve (an example of an expansion device), 10 Grasp device (an example of an expansion device), 12, 12A Base body, 14 1st cover member (an example of a cover member), 16 Bag body, 18B Clamping member, 30A 1st opening part , 30C 2nd opening, 30B passage, 40 sealed area, 42 1st part, 44 2nd part, 46 3rd part, 48 lower surface (an example of the tip part of the base), 52 outer peripheral surface of the base, 64 first cover Outer peripheral surface of member (an example of outer peripheral surface of cover member), 80 flow path, 82 support member, 90 cylindrical member, 92 movable arm, 94 inner wall surface

Claims (4)

A base on which an outer peripheral surface is formed ;
Not covering the distal end portion of the base body, a cover member outer peripheral surface of the same diameter as the outer peripheral surface is formed,
The first part over the entire circumference of the central part of the outer peripheral surface of the base body, the second part over the whole circumference of the tip part of the outer peripheral surface of the base body, and the entire peripheral surface of the cover member adjacent to the second part a cylindrical tubular body 3 by close contact with the site to form a sealed region sealed by the said base, inflated by the gas is air supply that over,
A caulking member that is arranged in the sealed region and that caulks the cylinder over the entire circumference of the cylinder from the opposite side of the second part and the third part across the cylinder;
An inflating device. Wherein the substrate includes a first opening Pneumatic fluid passes, are connected through a passage to the first opening, a second opening provided between the first portion and the second portion of the outer peripheral surface And having
The tubular body is inflated by the gas to be fed air from the first opening portion is exhausted from the second opening,
The inflating device according to claim 1. An inflator according to claim 1 or 2;
A support member for supporting the expansion device in the flow path,
Adjusting the flow rate of the fluid passing through the flow path by expanding or contracting the cylinder of the expansion device;
valve. An inflator according to claim 1 or 2 ;
A support member for supporting the expansion device,
By expanding or contracting the cylinder body of the expansion device, Ru is pressed against the cylindrical body to the inner wall surface of the tubular member,
Grab device.

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