JP5733922B2 - Gas holder and dust removing device for gas holder - Google Patents

Description

  The present invention relates to a gas holder capable of removing dust attached to an inner wall surface of a side wall of a tank and a dust removing device for the gas holder.

  Conventionally, a cylindrical tank, a piston that partitions the inside of the tank up and down and can move up and down, and can move between the inner peripheral surface of the side wall of the tank and the piston according to the up and down movement of the piston. There is known a gas holder including a sealing device that is disposed and sealed between upper and lower spaces partitioned by the piston. For example, this type of gas holder is disclosed in Patent Document 1 below, and stores gas in a space below the piston. Patent Document 2 listed below discloses a cleaning device provided with a blade that scrapes off residual toner adhering to the surface of a drum of a copying machine or the like. Patent Document 3 below discloses an aluminum hot rolling mill provided with a brush roll that scrapes off aluminum pieces and the like attached to the surface of the work roll.

JP 2003-194295 A JP 2009-98254 A JP-A-6-304615

  By the way, various kinds of gases are stored in the gas holder in accordance with the application. The gas is composed of various compositions, and some of the compositions contain dust adhering to the inner wall surface of the tank. Here, the sealing device disposed in the tank is provided with an annular seal member slidably fitted to the inner wall surface of the side wall of the tank. The seal member is formed of an elastic material such as rubber, for example, and slides on the inner wall surface of the side wall of the tank in the same direction as the piston moves up and down. Therefore, when dust adheres to the inner wall surface of the seal member, there is a risk that the wear of the sliding surface is accelerated by the dust.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a gas holder and a dust removing device for a gas holder that can improve the disadvantages of the conventional example and can remove dust attached to the inner wall surface of the side wall of the tank.

  In order to achieve the above object, the present invention provides a cylindrical tank, a piston that divides the tank up and down and is movable up and down, and the piston between the inner wall surface of the side wall of the tank and the piston. In a gas holder provided with a sealing device that is arranged so as to move in accordance with the vertical movement of the gas and seals between the upper and lower spaces partitioned by the piston, dust attached to the inner wall surface of the side wall is removed A dust removing device is provided.

  Here, it is desirable that the dust removing device includes a dust removing member having a curved surface equivalent to the inner wall surface that is slidable along the inner wall surface of the side wall.

  In order to achieve the above object, the present invention provides a cylindrical tank, a piston that divides the tank up and down and is movable up and down, and an inner wall surface of the side wall of the tank and the piston. A dust removing device for a gas holder, comprising: a sealing device that is arranged so as to move in accordance with the vertical movement of the piston and seals between the upper and lower spaces partitioned by the piston, It has a curved surface equivalent to the inner wall surface, and is provided with a dust removing member that removes dust attached to the inner wall surface by sliding along the inner wall surface.

  Here, it is preferable that the dust removing device is configured to move the dust removing member in the same direction in accordance with the vertical movement of the piston.

  The dust removing member includes a first inclined end portion facing one circumferential direction along the inner wall surface of the side wall and the upper side of the tank, and the other circumferential surface along the inner wall surface of the lower side of the tank and the side wall. It shape | molds so that it may have a 2nd inclination edge part which faces a direction as an edge part of the said curved surface. And the said dust removal apparatus arrange | positions the said several dust removal member at radial intervals along the circumferential direction of the inner wall face of the said side wall, and the said 1st inclination of one adjacent said dust removal member It is desirable to dispose each of the dust removing members so that at least a part of the end part and at least a part of the second inclined end part of the other dust removing member face each other in the vertical direction.

  The gas holder which concerns on this invention can remove the dust adhering to the inner wall face of a side wall by providing a dust removal apparatus. The gas holder and the dust removing device for a gas holder according to the present invention include a dust removing member having a curved surface equivalent to the inner wall surface slidable along the inner wall surface of the side wall. The dust adhering to the surface can be scraped off. In addition, the gas holder and the dust removing device for the gas holder can easily slide the dust removing member by moving the dust removing member in the same direction in accordance with the vertical movement of the piston. Moreover, this gas holder and the dust removal apparatus of a gas holder can scrape off dust without a leak by providing said 2 inclination edge part in a dust removal member. As described above, the gas holder and the dust removing device for the gas holder according to the present invention can remove dust adhering to the inner wall surface of the side wall, so that the progress of wear of the sealing member in the sealing device can be suppressed.

FIG. 1 is a view showing a gas holder and a dust removing device for the gas holder according to the present invention. FIG. 2 is an enlarged view of a portion A in FIG. 1, and is a diagram illustrating the dust removing device in detail. FIG. 3 is a diagram illustrating the pressing portion. FIG. 4 is a schematic view of the plate-like portion of the dust removing member as viewed from the outside of the tank in the radial direction. FIG. 5 is a cross-sectional view of the dust removing member taken along line XX of FIG. FIG. 6 is a view showing a gas holder provided with another type of sealing device. FIG. 7 is a diagram detailing a sealing device of another form of FIG. FIG. 8 is a view showing a gas holder provided with a sealing device according to another embodiment. FIG. 9 is a diagram detailing another embodiment of the sealing device of FIG.

  Embodiments of a gas holder and a gas holder dust removing apparatus according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments.

[Example]
An embodiment of a gas holder and a dust removing device for a gas holder according to the present invention will be described with reference to FIGS.

  The gas holder and the dust removing device for the gas holder according to the present invention are intended to improve the durability of the sealing device by removing dust adhering to the inner wall surface of the side wall of the tank, and its basic structure is well known in the art. Is the same as Accordingly, the gas holder illustrated here will be described with its basic structure omitted and with emphasis placed on the dust removal portion.

  FIG. 1 is a cross-sectional view taken along the central axis of the tank. The code | symbol 1 of this FIG. 1 shows the gas holder of a present Example. The gas holder 1 includes a cylindrical tank 2 and a disk-shaped piston 3 that partitions the inside of the tank 2 up and down and is movable up and down. In the gas holder 1 illustrated here, the lower space 2a defined by the piston 3 is used as a gas chamber. For this reason, the tank 2 is provided with a gas inlet / outlet part 4 for allowing gas to enter and exit the space 2a. Here, the term “upper and lower” refers to the upper and lower in a state where the gas holder 1 is installed. The radial direction is a radial direction centered on the central axis of the tank 2, the radially outer side is a direction from the central axis of the tank 2 toward the side wall, and the inner side in the radial direction is the side of the side wall. The direction from the center to the central axis.

  Further, the gas holder 1 of the present embodiment is provided with an annular sealing device 10 that seals between the upper and lower spaces 2 a and 2 b partitioned by the piston 3. The sealing device 10 is disposed between the inner wall surface 2 c of the side wall of the tank 2 and the piston 3 so as to be able to move in the same direction in accordance with the vertical movement of the piston 3.

  The sealing device 10 of this embodiment includes an annular seal member disposed at least one at a predetermined interval in the vertical direction of the tank 2 and grease filled in an annular space between the respective seal members. With these, the sealing performance is exhibited.

  Specifically, as shown in FIG. 2, the sealing device 10 includes an annular first to first slidably fitted in the vertical direction (axial direction) with respect to the inner wall surface 2 c of the side wall of the tank 2. 4 elastic seal members 11A, 11B, 11C, and 11D. These first to fourth elastic seal members 11A, 11B, 11C, and 11D are formed in an annular shape from an elastic material such as rubber, and have an outer diameter that is substantially the same as the inner diameter of the side wall of the tank 2. Have. The outer diameter may be set to be slightly larger than, for example, the inner diameter of the side wall of the tank 2 within a range that ensures the sealing performance and does not hinder the vertical movement of the piston 3 and the sealing device 10. In the setting, it is preferable to take into account the amount of deformation to the outside in the radial direction when a pressing force of the pressing portion 5 described later is applied. For this reason, the outer diameter is such that when the first to fourth elastic seal members 11A, 11B, 11C, 11D are deformed radially outward, the outer peripheral surface is brought into close contact with the inner wall surface 2c of the side wall of the tank 2. Within a possible range, the inner diameter of the side wall may be set to be the same as or slightly smaller than the inner diameter. On the other hand, the inner diameters of the first to fourth elastic seal members 11A, 11B, 11C, and 11D are not necessarily the same size. However, in this example, each inner diameter is unified to the same size. Further, the first to fourth elastic seal members 11A, 11B, 11C, and 11D do not have to have the same height in the axial direction, but in this example, each has the same height. It is unified.

  Here, the annular surface at the lower end of the first elastic seal member 11A and the annular surface at the upper end of the second elastic seal member 11B are brought into contact with each other, and the annular surface at the lower end of the third elastic seal member 11C and the fourth elastic seal member are contacted. The upper and lower surfaces of the tank 2 are placed between the first and second elastic seal members 11A and 11B and the third and fourth elastic seal members 11C and 11D. A predetermined interval is provided in the direction. In the sealing device 10, grease 12 is filled into an annular space formed between the respective sets. Since the grease 12 leaks from the radially inner side as it is, it is preferable to provide a wall surface member (not shown) on the radially inner side to suppress the leakage.

  The sealing device 10 configured as described above is held by a holding member 5a in the pressing portion 5 shown in FIG.

  The pressing portion 5 includes a holding member 5a that holds the first to fourth elastic seal members 11A, 11B, 11C, and 11D from the inner peripheral surface side. The holding member 5a has curved surfaces along the inner peripheral surfaces of the first to fourth elastic seal members 11A, 11B, 11C, and 11D, and the first to fourth elastic seal members 11A, 11A 11B, 11C, and 11D are held. For example, the holding member 5 a is a curved plate-like member having a curved surface on the radially outer side, and a plurality of holding members 5 a are provided radially around the central axis of the tank 2. The holding member 5a is formed at a height that is at least the distance between the annular surface at the upper end of the first elastic seal member 11A and the annular surface at the lower end of the fourth elastic seal member 11D. And this holding member 5a is made to hold | maintain by fitting each inner peripheral surface of 1st-4th elastic seal member 11A, 11B, 11C, 11D to the curved surface as the outer peripheral surface, for example, The inner peripheral surface side of the first to fourth elastic seal members 11A, 11B, 11C, and 11D may be fitted and held in respective circumferential grooves (not shown) provided on the outer peripheral surface. Further, the holding member 5a is held such that the lower side thereof can be moved in the radial direction on the outer peripheral edge of the piston 3, for example. For this reason, the first to fourth elastic seal members 11A, 11B, 11C, and 11D can be moved in accordance with the vertical movement of the piston 3.

  The pressing portion 5 includes a plurality of levers 5b that protrude from the inner peripheral surface side of the holding members 5a, and counterweights 5c that are provided on the protruding end sides of the levers 5b. . The lever 5b is a rod-shaped member that protrudes radially inward and upward from the inner peripheral surface side of the holding member 5a. The respective levers 5b are arranged radially at substantially equal intervals around the central axis of the tank 2 (piston 3). Then, one counterweight 5c is attached to each protruding end side of each lever 5b. As a result, the lever 5b converts the force in the gravity direction of the counterweight 5c into a radially outward force and transmits the force to the holding member 5a as a pressing force. The pressing force generated in each holding member 5a is transmitted to the first to fourth elastic seal members 11A, 11B, 11C, and 11D, and presses these outer peripheral surfaces against the inner wall surface 2c of the side wall of the tank 2. That is, the holding member 5a has not only the holding function of the first to fourth elastic seal members 11A, 11B, 11C, and 11D, but also the first to fourth elastic seal members 11A, 11B, 11C, and 11D in the pressing portion 5. It also has a function as a transmission member of the pressing force to.

  By the way, when the gas stored in the gas holder 1 contains dust, the dust may adhere to the inner wall surface of the tank 2. When the dust adheres to the inner wall surface 2c of the side wall of the tank 2, the first to fourth elastic seal members 11A, 11B, 11C, and 11D slide up and down while being in close contact with the inner wall surface 2c. May accelerate the progress of wear on the outer peripheral surface (sliding surface) due to the dust.

  Therefore, the gas holder 1 of this embodiment is provided with a dust removing device 6 for removing dust adhering to the inner wall surface 2c of the side wall of the tank 2.

As shown in FIGS. 2 and 4, the dust removing device 6 forms a curved surface equivalent to the inner wall surface 2 c that can slide along the inner wall surface 2 c, and dust is generated when sliding at the end of the curved surface. The dust removing member 7 is scraped off. The dust removing member 7 has a flat plate-like portion 7a, which is curved when the plane of the plate-like portion 7a is pressed against the inner wall surface 2c, and has a curved surface equivalent to the inner wall surface 2c. Make it. The dust removing member 7 is formed of, for example, spring steel or the like so as to enable such bending. Here, the first and second extending portions 7b and 7c are respectively suspended from both ends (the upper end and the lower end when installed) of the plate-like portion 7a constituting the main body inward in the radial direction. Shape in a letter shape. A plurality of dust removing members 7 are arranged radially at substantially equal intervals around the central axis of the tank 2 (piston 3). In this illustration, to arrange the dust removing member 7 above the space 2b, i.e. and sealing device 10 above the piston 3. 4 is a schematic view of the plate-like portion 7a of each dust removing member 7 as viewed from the outside of the tank 2 to the inside in the radial direction.

  In the dust removing member 7, the plate width (circumferential width) of the plate-like portion 7a is shortened so that the plate-like portion 7a pressed radially outward can easily follow the inner wall surface 2c. Thereby, when the plate-like portion 7a is pressed against the inner wall surface 2c, as shown in FIG. 5, it forms a curved surface along the inner wall surface 2c, and the adhesion to the inner wall surface 2c is improved. , Dust removal performance is improved.

Further, the plate-like portion 7a has first and second inclined end portions 7a ₁ and 7a ₂ which are inclined with respect to the vertical direction when installed. The first inclined end portion 7a ₁ faces the upper side of the tank 2 and one circumferential direction along the inner wall surface 2c of the side wall thereof, and forms an end portion of a curved surface along the inner wall surface 2c. In contrast, the second inclined end portion 7a ₂ faces the lower side of the tank 2 and the other circumferential direction along the inner wall surface 2c of the side wall thereof, and forms a curved end portion along the inner wall surface 2c. Here, the inclination angle of the first inclined end portion 7a ₁ and the second inclined end portions 7a ₂ is formed into substantially parallelogram plate-like portion 7a to be the same. Incidentally, the first inclined end portion 7a ₁ and the second inclination angle of the inclined end portion 7a _2, not necessarily the same.

Here, since the piston 3 moves up and down in the gas holder 1 of the present embodiment, the dust removing device 6 is configured to move up and down in accordance with the movement of the piston 3. That is, in the dust removing device 6 exemplified here, the dust on the inner wall surface 2c is scraped off by the plate-like portion 7a while moving each dust removing member 7 up and down along the inner wall surface 2c of the side wall of the tank 2. Let The first inclined end 7a ₁ scrapes off dust when ascending, and the second inclined end 7a ₂ scrapes off dust when descending. Here, in order to prevent a scraping leakage dust, and at least a portion of the first inclined end portion 7a ₁ of the plate portion 7a of one of the dust removing member 7 adjacent, plate-shaped portion 7a of the other dust removing member 7 at least a portion of the second inclined end portion 7a ₂ of, is arranged the dust removing member 7 each so as to face in the vertical direction. In other words, the dust removing member 7 each includes a scraping trajectory of the first inclined end portion 7a ₁ dust in the adjacent one of the plate-like portion 7a, the other of the second inclined end portion 7a of the plate portion 7a ₂ Dust The scraping trajectory is arranged so as to overlap even part of it.

  The dust removing device 6 illustrated here is provided with a holding portion 8 that holds the dust removing member 7 and a support portion 9 that supports the dust removing member 7 on the piston 3 via the holding portion 8. Realize up and down movement according to 3 movement. Therefore, in the dust removing device 6, the dust removing member 7 can be easily slid.

  The holding part 8 is configured to connect the first extending part 7 b of one adjacent dust removing member 7 and the second extending part 7 c of the other dust removing member 7. For example, the holding portion 8 includes a male screw portion 8a that is inserted into the through holes of the first and second extending portions 7b and 7c, and a female screw portion 8b that is screwed into the male screw portion 8a. Prepare. The holding portion 8 is disposed for each adjacent dust removing member 7. Since the adjacent dust removing members 7 can rotate around the holding portion 8, all the dust removing members 7 can be connected to each other by the holding portion 8 to form an annular shape, and the inner wall surface 2 c is formed in the tank 2. Can fit along. Here, for example, an elastic member or the like may be interposed between the first extending portion 7b and the second extending portion 7c.

  All the dust removing members 7 connected to one of them are supported by a plurality of support portions 9 arranged radially at substantially equal intervals around the central axis of the tank 2 (piston 3). For example, the support portion 9 fixes one end to the holding portion 8 and the other end to the upper surface of the piston 3. The support portion 9 includes, for example, an L-shaped rod-shaped member having an extending portion extending upward from the upper surface of the piston 3 and an extending portion extending radially outward from the extending end thereof, In addition to supporting the dust removing member 7, the dust removing member 7 also functions as a pressing portion that presses the dust removing member 7 outward in the radial direction. Here, it is not always necessary to provide each support portion 9 for each dust removing member 7. Moreover, each support part 9 should just be arrange | positioned between the group of the lever 5b in the press part 5, and the counterweight 5c.

In the dust removing device 6 configured as described above, all the dust removing members 7 can be brought into close contact with the inner wall surface 2 c of the side wall of the tank 2. For this reason, in the dust removing device 6, the dust removing member 7 also rises as the piston 3 rises, so that the dust removing member 7 rises while the side wall of the tank 2 is mainly at the first inclined end 7 a ₁ . The dust adhering to the inner wall surface 2c can be scraped off. Further, in the dust removing device 6, since the dust removing member 7 with the descent of the piston 3 is also lowered, of the side wall of the tank 2 primarily in the second inclined end portions 7a ₂ while the dust removing member 7 is lowered The dust adhering to the wall surface 2c can be scraped off. Therefore, in the first to fourth elastic seal members 11A, 11B, 11C, and 11D, it is possible to suppress the progress of wear on the outer peripheral surface (sliding surface) due to dust attached to the inner wall surface 2c.

  In the description so far, the dust removing member 7 having the flat plate-like portion 7a has been exemplified, but the dust removing member may be a curved plate-like member having a curved surface equivalent to the inner wall surface 2c on the radially outer side. Even in this case, the plate width is shortened in the same manner as the plate-like portion 7a, thereby improving the adhesion when pressed against the inner wall surface 2c and improving the dust removal performance.

  By the way, in the present embodiment, the grease 12 is sandwiched by a set of two elastic seal members (a set of the first and second elastic seal members 11A and 11B and a set of the third and fourth elastic seal members 11C and 11D). However, the sealing device 10 may have a structure in which the grease 12 is sandwiched between two elastic seal members arranged at intervals, or a structure in which the grease 12 is sandwiched between a group of three or more elastic seal members. Also good. In the sealing device 10, it is only necessary to have at least one elastic sealing member on both the upper and lower sides sandwiching the grease 12. Furthermore, a plurality of stages of grease 12 may be provided at intervals, and each of the greases 12 may be sandwiched between at least one elastic seal member.

  Moreover, although the gas holder 1 provided with the sealing apparatus 10 mentioned above was illustrated in the present Example, this invention can also be applied to the gas holder 1A shown in FIG. 6 which replaced the sealing apparatus 10 with the thing of another form. The gas holder 1 </ b> A not only replaces the sealing device 10 with the sealing device 20 with respect to the gas holder 1, but also replaces the piston 3 with the piston 13. The piston 13 is basically the same as the piston 3, but, as shown in FIG. 7, the first tube portion 13b extends downward from the outer peripheral end of the main body 13a, and the first tube portion 13b extends. An annular portion 13c is extended from the installed end toward the radially outer side, and a second cylindrical portion 13d is extended upward from the extended end of the annular portion 13c. An annular space surrounded by the first cylindrical portion 13b, the annular portion 13c, and the second cylindrical portion 13d forms a part of a storage chamber for the seal oil 22 in the sealing device 20 described below.

  The sealing device 20 includes first to fourth elastic sealing members 21A, 21B, 21C, and 21D, similarly to the sealing device 10 illustrated above. These first to fourth elastic seal members 21A, 21B, 21C, and 21D are formed in the same shape as the first to fourth elastic seal members 11A, 11B, 11C, and 11D of the seal device 10. . Here, a predetermined interval is provided in the vertical direction of the tank 2 between the set of the first and second elastic seal members 21A and 21B and the set of the third and fourth elastic seal members 21C and 21D. . Also in the sealing device 20, the first to fourth elastic seal members 21A, 21B, 21C, and 21D are pressed by the following pressing portion 17 from the inner peripheral surface side toward the radially outer side.

  The pressing portion 17 projects from a plurality of holding members 17a that hold the first to fourth elastic seal members 21A, 21B, 21C, and 21D from the inner peripheral surface side, and from the inner peripheral surfaces of the respective holding members 17a. And a counterweight 17c provided on the protruding end side of each lever 17b.

  The holding member 17 a is the same as the holding member 5 a of the pressing portion 5. The holding member 17a holds the lower side of the holding member 17a on the second cylindrical portion 13d of the piston 13 so as to be movable in the radial direction. For this reason, the holding member 17a moves the first to fourth elastic seal members 21A, 21B, 21C, and 21D in accordance with the vertical movement of the piston 13, and also applies the pressing force to the first to fourth elastic seal members. 21A, 21B, 21C, 21D.

  The lever 17b is a rod-shaped member that protrudes radially inward and upward from the inner peripheral surface of the holding member 17a, like the lever 5b of the pressing portion 5, and the force in the gravity direction of the counterweight 17c is used as a diameter. It converts into the force of a direction outer side, and is transmitted to the holding member 17a as pressing force. The pressing force generated in the holding member 17a is transmitted to the first to fourth elastic seal members 21A, 21B, 21C, and 21D, and presses these outer peripheral surfaces against the inner wall surface 2c of the side wall of the tank 2. Each lever 17b is arranged radially at substantially equal intervals around the central axis of the tank 2 (piston 13), and one counterweight 17c is attached to each projecting end side.

  In the sealing device 20, the sealing oil 22 is stored even above the annular upper end of the first elastic sealing member 21A. The seal oil 22 is for ensuring gas sealing performance as well as the grease 12 described above, and also functions as a lubricant for the first to fourth elastic seal members 21A, 21B, 21C, 21D. To do.

  Also in this example, since the dust removing device 6 scrapes off dust adhering to the inner wall surface 2c of the side wall of the tank 2, also in this sealing device 20, the first to fourth elastic seal members 21A, 21B, 21C, 21D are The progress of wear on the outer peripheral surface (sliding surface) due to dust adhering to the inner wall surface 2c can be suppressed.

  Further, the sealing device may be replaced with the following. A gas holder 1B shown in FIG. 8 is obtained by replacing the sealing device 20 with a sealing device 30 with respect to the gas holder 1A. The sealing device 30 includes one cylindrical elastic sealing member 31. The elastic seal member 31 has its outer peripheral surface slidably fitted to the inner wall surface 2c of the side wall of the tank 2 and, as shown in FIG. 9, from its inner peripheral surface side toward the radially outer side. Then, it is pressed by the same as the pressing portion 17 described above.

  The elastic seal member 31 is held at the lower end side thereof by the second cylindrical portion 13 d of the piston 13. In the sealing device 30, an annular space is formed by the first cylinder portion 13 b, the annular portion 13 c, the second cylinder portion 13 d, and the elastic seal member 31, and the space forms a storage chamber for the seal oil 32. Here, the seal oil 32 is stored even above the upper end of the elastic seal member 31. The seal oil 32 is for ensuring gas sealing performance and also functions as a lubricant for the elastic seal member 31.

  Even in such an example, since the dust removing device 6 scrapes off dust adhering to the inner wall surface 2c of the side wall of the tank 2, also in this sealing device 30, the elastic seal member 31 has an outer periphery due to dust adhering to the inner wall surface 2c. The progress of wear on the surface (sliding surface) can be suppressed.

  As described above, the gas holder and the dust removing device for the gas holder according to the present invention are useful for a technique for removing dust attached to the inner wall surface of the side wall of the tank.

1, 1A, 1B Gas holder 2 Tank 2c Inner wall surface 3, 13 Piston 5, 17 Pressing part 6 Dust removing device 7 Dust removing member 7a Plate-like part 7a ₁ First inclined end part 7a ₂ Second inclined end part 7b First extension Installation part 7c Second extension part 8 Holding part 8a Male thread part 8b Female thread part 9 Support part 10, 20, 30 Sealing device 11A, 21A First elastic seal member 11B, 21B Second elastic seal member 11C, 21C Third Elastic seal member 11D, 21D Fourth elastic seal member 12 Grease 22 Seal oil 31 Elastic seal member

Claims (7)

A cylindrical tank, a piston that divides the tank up and down and is movable up and down, and an inner wall surface of the side wall of the tank and the piston are arranged so as to move in accordance with the vertical movement of the piston. In a gas holder provided with a sealing device for sealing between the upper and lower spaces partitioned by the piston,
A first inclined end portion that faces one circumferential direction above the tank and along the inner wall surface of the side wall, and a second inclined end portion that faces the other circumferential direction below the tank and along the inner wall surface of the side wall. gas holder, characterized in that when, with the dust removing member having, digits set the dust remover for removing dust adhered to the inner wall surface of the side wall. The dust removing member has a curved surface equivalent to the inner wall surface slidable along the inner wall surface of the side wall, and the first inclined end portion and the second inclined portion constitute an end portion of the curved surface. to, gas holder according to claim 1, wherein.   The gas holder according to claim 2, wherein the dust removing device is configured to move the dust removing member in the same direction in accordance with the vertical movement of the piston. Before SL dusting device, spaced radially along the circumferential direction of the inner wall surface of the side wall as well as arranging a plurality of the dust removing member, said first angled end of one of said dust removing member adjacent The respective dust removing members are arranged such that at least a part of the second part and at least a part of the second inclined end of the other dust removing member face each other in the vertical direction. 3. The gas holder according to 3. A cylindrical tank, a piston that divides the tank up and down and is movable up and down, and an inner wall surface of the side wall of the tank and the piston are arranged so as to move in accordance with the vertical movement of the piston. A dust removing device for a gas holder, comprising: a sealing device for sealing between the upper and lower spaces partitioned by the piston;
It has a curved surface equivalent to the inner wall surface of the side wall, and removes dust adhering to the inner wall surface by sliding along the inner wall surface, and one of the upper side of the tank and the inner wall surface of the side wall. A dust removing member having a first inclined end portion facing the circumferential direction and a second inclined end portion facing the other circumferential direction below the tank and along the inner wall surface of the side wall as an end portion of the curved surface is provided. A dust removing device for a gas holder, wherein   6. The dust removing device for a gas holder according to claim 5, further comprising a member moving portion that moves the dust removing member in the same direction in accordance with the vertical movement of the piston. A plurality of the dust removing members are arranged radially spaced along the circumferential direction of the inner wall surface of the side wall, and at least a part of the first inclined end of one of the adjacent dust removing members. 7. The dust removal device for a gas holder according to claim 6, wherein the second inclined end portion and the other second inclined end portion are disposed so as to face each other in the vertical direction.

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