JP2013245702A - Cylindrical cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylindrical cover which is capable of hermetically covering a columnar body and is not dropped off from the columnar body.SOLUTION: A cylindrical cover 1 includes a front first half cover 111, a front second half cover 112, a rear first half cover 121 and a rear second half cover 122 in half divided cylindrical shape. Both side portions of the front first half cover 111 are locked to both side portions of the front second half cover 112 in a circumferential direction and can be slid with respect to an axis direction, and it is similar between the rear first half cover 121 and the rear second half cover 122. Between the front first half cover 111 and the rear first half cover 121, overlap portions are overlapped in a radial direction, respectively, and it is similar between the front second half cover 112 and the rear second half cover 122. When a rear cover 12 is rotated by 180° in the circumferential direction, between a columnar body 9 and the front second half cover 112, the rear first half cover 121 can be inserted and ejected.

Description

  The present invention relates to a cylindrical cover that covers a linear columnar body.

  In the boiler combustion chamber, a soot blower may be provided adjacent to a boiler heat transfer tube (hereinafter referred to as “boiler tube”) arranged in parallel. By removing the soot adhering to the surface of the boiler tube by ejecting water vapor from the soot blower, a decrease in heat exchange efficiency is prevented. However, if soot is frequently removed, there arises a problem that the boiler tube is thinned by a drain attack or the like. Therefore, a protective cover is attached to the boiler pipe.

  On the other hand, as exemplified in Patent Documents 1 and 2, the boiler tube is fixed to the wall surface of the combustion chamber or has a curved end. Therefore, in order to attach a protective cover after installing a boiler pipe, it is necessary to prepare a divided protective cover.

  The boiler tube protector disclosed in Patent Document 3 has a cylindrical shape, and a plurality of pairs of ceramic bodies are arranged in the vertical direction. The dividing surface between each pair of ceramic bodies is formed in the longitudinal direction on the side of the ceramic bodies. The dividing surface includes a stepped portion extending in an inclined manner at an intermediate portion and a vertical surface extending vertically from both ends of the stepped portion. The ceramic body is attached to the boiler tube by mortar.

JP 58-224218 A Japanese Patent Laid-Open No. 03-230001 Japanese Patent Laid-Open No. 10-227403

  By the way, in the boiler tube protector disclosed by patent document 3, there exists a possibility that a clearance gap may be made between adjacent ceramic bodies. If there is a gap between adjacent ceramic bodies in the axial direction, the ceramic bodies facing each other across the boiler tube may be disengaged and the ceramic body may fall off the boiler tube.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a cylindrical cover that can seal and cover a columnar body and does not fall off from the columnar body.

  The invention described in claim 1 is a cylindrical cover that covers a linear columnar body, and includes a front cover and a rear cover adjacent to the front cover in the axial direction of the columnar body. A first front half cover having a half-tubular shape extending in the axial direction, and a second front half cover having a half-tubular shape covering the opposite side of the columnar body from the first front half cover. , A half-tubular rear first half cover extending in the axial direction, and a half-tubular rear second half cover covering the opposite side of the columnar body from the rear first half cover. A half cover and the rear first half cover are adjacent to each other in the axial direction, and the overlapping portion of the front first half cover and the rear first half cover are disposed between the front first half cover and the rear first half cover. One half cover overlap part is in the radial direction of the columnar body The front second half cover and the rear second half cover are adjacent to each other in the axial direction, and the front second half cover is disposed between the front second half cover and the rear second half cover. And the overlapping portion of the rear second half cover overlap in the radial direction, and both side portions of the front first half cover in the circumferential direction of the columnar body are the front second half in the circumferential direction. The both sides of the cover are locked in the circumferential direction and slidable in the axial direction, and both sides of the rear first half cover in the circumferential direction are the rear second half cover in the circumferential direction. The both sides of the front cover are locked in the circumferential direction, slidable in the axial direction, and the rear cover is rotatable in the circumferential direction with respect to the front cover. When the front first half cover and the rear second half cover are adjacent to each other, and the front second half cover and the rear first half cover are adjacent to each other, the both sides of the rear first half cover The rear first half cover can be inserted and removed between the columnar body and the front second half cover in a state where the both sides of the rear portion and the second rear half cover are locked in the circumferential direction. It is.

  Invention of Claim 2 is a cylindrical cover of Claim 1, Comprising: The said both sides of the said front 1st half cover have the convex part or recessed part extended in the said axial direction, The said front 1st Two side covers of the two half covers extend in the axial direction and have concave portions or convex portions that fit into the convex portions or the concave portions of the two side portions of the front first half cover, and Both side portions have convex portions or concave portions extending in the axial direction, the both side portions of the rear second half cover extend in the axial direction, and the convex portions or the convex portions on the both side portions of the rear first half cover. It has a recessed part or a convex part which fits into the said recessed part.

  Invention of Claim 3 is the cylindrical cover of Claim 1 or 2, Comprising: The said overlapping part of the said front 1st half cover has the convex part or recessed part extended in the said circumferential direction, The overlapping portion of the rear first half cover has a concave portion or a convex portion that extends in the circumferential direction and fits into the convex portion or the concave portion of the overlapping portion of the front first half cover. The overlapping portion of the two half covers has a convex portion or a concave portion extending in the circumferential direction, the overlapping portion of the rear second half cover extends in the circumferential direction, and the front second half cover A concave portion or a convex portion that fits into the convex portion or the concave portion of the overlapping portion is provided.

  Invention of Claim 4 is a cylindrical cover in any one of Claim 1 thru | or 3, Comprising: The inner surface of the said front 1st half cover and the inner surface of the said back 1st half cover are cylindrical surfaces. Is part of.

  A fifth aspect of the present invention is the cylindrical cover according to any one of the first to fourth aspects, wherein the front first half cover, the front second half cover, the rear first half cover, and the rear side. The second half cover has a half-cylindrical shape.

  A sixth aspect of the present invention is the cylindrical cover according to any one of the first to fifth aspects, and is formed of a brittle material.

  A seventh aspect of the present invention is the cylindrical cover according to any one of the first to sixth aspects, wherein both end portions of the columnar body are connected to a curved portion or supported by a support member. The length of the columnar body is equal to the length of the cylindrical cover.

  The cylindrical cover which concerns on this invention can seal and cover a columnar body, and can prevent the drop-off from a columnar body.

It is a perspective view of a cylindrical cover. It is sectional drawing of a front cover. It is sectional drawing of a cylindrical cover. It is a figure which shows the flow of the attachment operation | work of a cylindrical cover. It is sectional drawing which shows the cylindrical cover in the middle of attachment. It is sectional drawing which shows the cylindrical cover in the middle of attachment. It is sectional drawing which shows the cylindrical cover in the middle of attachment. It is sectional drawing which shows the cylindrical cover in the middle of attachment.

  FIG. 1 is a perspective view of a cylindrical cover 1 according to an embodiment of the present invention. The cylindrical cover 1 covers a straight portion of the boiler pipe in order to prevent the boiler pipe from being thinned by the soot blower. The cylindrical cover 1 can also be used as a cover that covers various other linear columns.

  In the following description, an object covered by the cylindrical cover 1 is referred to as a “columnar body 9”. For convenience of explanation, the upper left side in FIG. 1 is described as “front side” and the lower right side is described as “rear side”, but the front-rear direction may be any direction. For example, the front-rear direction may be a vertical direction that is a gravitational direction, or may be a left-right direction or a tilting direction. The front-rear direction coincides with the axial direction of the columnar body 9. Hereinafter, the axial direction of the columnar body 9 is simply referred to as “axial direction”. The circumferential direction around the central axis of the columnar body 9 is simply referred to as “circumferential direction”. The central axis does not need to be strictly determined, and when the cross section of the columnar body 9 is not circular, an axis positioned approximately at the center is determined as the central axis. The radial direction around the central axis of the columnar body 9 is simply referred to as “radial direction”. The cylindrical cover 1 extends in the axial direction. The central axis of the columnar body 9 is also the central axis of the cylindrical cover 1 and is simply referred to as “central axis” hereinafter.

  The cylindrical cover 1 includes a front cover 11 and a rear cover 12. Each of the front cover 11 and the rear cover 12 is long in the axial direction. The rear cover 12 is adjacent to the rear side of the front cover 11 in the axial direction.

  In the present embodiment, the front cover 11 includes a front first half cover 111 and a front second half cover 112. However, the front first half cover 111 and the front second half cover 112 may be the main part of the front cover 11, and the front cover 11 may include other members. The rear cover 12 includes a rear first half cover 121 and a rear second half cover 122. The rear first half cover 121 and the rear second half cover 122 may also be the main parts of the rear cover 12, and the rear cover 12 may include other members. In the following description, the front first half cover 111, the front second half cover 112, the rear first half cover 121, and the rear second half cover 122 are collectively referred to as “half cover”.

  Each half cover extends in the axial direction and has a half tubular shape. The half-tubular shape refers to the shape of one part when the cylindrical body is cut at a plane including the central axis or a plane close to the central axis. Each half cover is formed of a brittle material such as ceramic or porous ceramic. In the case of ceramics or porous ceramics, at least one of alumina, silica, cordierite, mullite, zirconia, titania and Vycor glass is used as the main raw material. The present invention can also be applied to other materials that exhibit high brittleness. The front first half cover 111 covers one side of the columnar body 9 in a direction perpendicular to the central axis. The front second half cover 112 covers the other side of the columnar body 9, that is, the side opposite to the front first half cover 111 of the columnar body 9.

  Similarly, the back first half cover 121 covers one side of the columnar body 9 in a direction perpendicular to the central axis. The rear second half cover 122 covers the other side of the columnar body 9, that is, the side opposite to the rear first half cover 121 of the columnar body 9. The front first half cover 111 and the rear first half cover 121 are adjacent to each other in the axial direction. The front second half cover 112 and the rear second half cover 122 are adjacent to each other in the axial direction.

  FIG. 2 is a cross-sectional view of the front cover 11 in a plane perpendicular to the central axis. The front first half cover 111 and the front second half cover 112 are substantially halved cylindrical. The half-cylindrical shape is a shape of one part when the cylinder is cut at a plane including the central axis or a plane close to the central axis. An inner surface 211 and an outer surface 212 of the front first half cover 111 are part of a cylindrical surface. The inner surface 211 and the outer surface 212 are substantially half cylindrical surfaces. The inner surface 221 and the outer surface 222 of the front second half cover 112 are part of a cylindrical surface. The inner surface 221 and the outer surface 222 are substantially half cylindrical surfaces. The diameter of the outer surface 212 of the front first half cover 111 is slightly smaller than the diameter of the inner surface 221 of the front second half cover 112. The diameter of the inner surface 211 of the front first half cover 111 is slightly larger than the diameter of the outer peripheral surface 91 of the columnar body 9.

  In the cross section, both side portions 231 in the circumferential direction of the front first half cover 111 and both side portions 232 in the circumferential direction of the front second half cover 112 overlap in the radial direction. In the present embodiment, the front first semi-cover 111 is approximately a semicircle, and the front second semi-cover 112 is larger than the semicircle in the circumferential direction.

  Both side portions 231 in the circumferential direction of the front first half cover 111 have recesses 241 extending in the axial direction on the outer surface 212. The recess 241 is recessed inward in the radial direction. Both side portions 232 in the circumferential direction of the front second half cover 112 have convex portions 242 extending in the axial direction on the inner surface 221. The convex part 242 projects inward in the radial direction. The convex part 242 fits into the concave part 241. Accordingly, both side portions 231 of the front first half cover 211 are locked in the circumferential direction with respect to both side portions 232 of the front second half cover 212 and are slidable in the axial direction.

  The cross section of the rear cover 12 is the same as that in FIG. That is, the rear first half cover 121 and the rear second half cover 122 are substantially halved cylindrical. The inner surface and the outer surface of the rear first half cover 121 are part of a cylindrical surface, and are substantially a half cylindrical surface. The inner surface and the outer surface of the rear second half cover 122 are also part of the cylindrical surface, and are substantially half cylindrical surfaces. The diameter of the outer surface of the rear first half cover 121 is slightly smaller than the diameter of the inner surface of the rear second half cover 122. The diameter of the inner surface of the rear first half cover 121 is slightly larger than the diameter of the outer surface 91 of the columnar body 9. Moreover, the both sides of the circumferential direction of the back 1st half cover 121 and the both sides of the circumferential direction of the back 2nd half cover 122 overlap with radial direction.

  Similar to the front cover 11, both side portions in the circumferential direction of the rear first half cover 121 have recesses extending in the axial direction on the outer surface. Both side portions in the circumferential direction of the rear second half cover 122 have convex portions extending in the axial direction on the inner surface. The convex part fits into the concave part. Thereby, both sides of the back first half cover 221 in the circumferential direction are locked with respect to both sides of the back second half cover 222 in the circumferential direction, and are slidable in the axial direction.

  FIG. 3 is a cross-sectional view of the cylindrical cover 1 by a surface including the central axis in the vicinity of the boundary between the front cover 11 and the rear cover 12. The front first half cover 111 has an overlapping portion 311 that protrudes toward the rear first half cover 121. The rear first half cover 121 has an overlapping portion 321 that protrudes toward the front first half cover 111. The overlapping portions 311 and 321 each have a halved cylindrical shape. Between the front first half cover 111 and the rear first half cover 121, the overlapping portion 311 and the overlapping portion 321 overlap in the radial direction.

  In the present embodiment, the overlapping portion 311 is located on the radially outer side of the overlapping portion 321. The diameter of the outer surface of the overlapping portion 311 is the same as the diameter of the outer surface of the front first half cover 111. The diameter of the inner surface of the overlapping portion 311 is larger than the diameter of the inner surface of the front first half cover 111. The diameter of the outer surface of the overlapping portion 321 is smaller than the diameter of the outer surface of the rear first half cover 121. The diameter of the inner surface of the overlapping portion 321 is the same as the diameter of the inner surface of the rear first half cover 121. Between the front first half cover 111 and the rear first half cover 121, the inner surface and the outer surface of the cylindrical cover 1 have no step.

  The overlapping portion 311 has a concave portion 331 extending in the circumferential direction on the inner surface. The overlapping portion 321 has a convex portion 341 extending in the circumferential direction on the outer surface. The convex part 341 fits into the concave part 331. Accordingly, the front first half cover 111 is locked with respect to the rear first half cover 121 in the axial direction and is slidable in the circumferential direction.

  A structure similar to the overlapping portions 311 and 321 is also provided between the front second half cover 112 and the rear second half cover 122. Specifically, the front second half cover 112 has an overlapping portion 312 that protrudes toward the rear second half cover 122. The rear second half cover 122 has an overlapping portion 322 that protrudes toward the front second half cover 112. Each of the overlapping portions 312 and 322 has a half cylindrical shape. Between the front second half cover 112 and the rear second half cover 122, the overlapping portion 312 and the overlapping portion 322 overlap in the radial direction.

  In the present embodiment, the overlapping portion 312 is located inside the overlapping portion 322 in the radial direction. The diameter of the outer surface of the overlapping portion 321 is the same as the diameter of the outer surface of the front second half cover 121. The diameter of the inner surface of the overlapping portion 321 is the same as the diameter of the inner surface of the front second half cover 121. The diameter of the outer surface of the overlapping portion 322 is larger than the diameter of the outer surface of the rear second half cover 122. The diameter of the inner surface of the overlapping portion 322 is the same as the diameter of the inner surface of the rear second half cover 122. As in the case of the front first half cover 111 and the rear first half cover 121, the inner surface and the outer surface of the cylindrical cover 1 are stepped between the front second half cover 112 and the rear second half cover 122. The structure which does not have may be sufficient.

  The overlapping portion 312 has a convex portion 332 extending in the circumferential direction on the outer surface. The overlapping portion 322 has a concave portion 342 extending in the circumferential direction on the inner surface. The convex portion 332 fits into the concave portion 342. Accordingly, the front second half cover 121 is locked with respect to the rear second half cover 122 in the axial direction and is slidable in the circumferential direction.

  A substantially cylindrical portion is formed by the overlapping portions 311 and 312. A substantially cylindrical portion is formed by the overlapping portions 321 and 322. By the overlapping portions 311, 312, 321, 322, the rear cover 12 can be rotated in the circumferential direction relative to the front cover 11, and the relative position is fixed in the axial direction.

  In addition, the convex part 242 of the front 2nd half cover 112 extended in an axial direction shown in FIG. 2 and the same convex part of the back 2nd half cover 122 are not provided in an overlapping part. There are no large gaps between the overlapping portion 311 and the overlapping portion 312 and between the overlapping portion 321 and the overlapping portion 322. Therefore, the cylindrical cover 1 covers the outer peripheral surface of the columnar body 9 so as to be substantially sealed.

  Next, an operation for attaching the cylindrical cover 1 to the columnar body 9 will be described. FIG. 4 is a diagram showing a flow of the attaching operation of the cylindrical cover 1. 5 to 8 are cross-sectional views showing the cylindrical cover 1 being attached.

  First, as shown in FIG. 5, the front first half cover 111 is applied so as to contact the columnar body 9 (step S11). Then, as shown by the arrow 81, the front second half cover 112 is moved from the rear to the front (step S12). Thereby, as shown in FIG. 2, the convex portion 242 of the front second half cover 112 is engaged with the concave portion 241 of the front first half cover 111. The front second half cover 112 may be placed along the columnar body 9 and the front first half cover 111 may be slid first, but the diameter of the inner surface 211 of the front first half cover 111 is the outer circumference of the columnar body 9. Since it is almost equal to the diameter of the surface, it is easier to assemble the first first half cover 111 along the columnar body 9 first.

  Next, as shown in FIG. 6, the rear first half cover 121 is disposed adjacent to the rear of the front second half cover 112. The rear first half cover 121 is moved as indicated by an arrow 82. Accordingly, the rear first half cover 121 is inserted into the space 83 (see FIG. 2) between the columnar body 9 and the front second half cover 112 (step S13). In step S12, the front second half cover 112 is engaged with the front first half cover 111 in a state where the front second half cover 112 and the rear first half cover 121 are overlapped, thereby omitting step S13. You can also.

  As shown in FIG. 7, the rear second half cover 122 is disposed adjacent to the rear of the front first half cover 111 (step S14). Then, the rear first half cover 121 is pulled out rearward as indicated by an arrow 84 (step S15). Thereby, the convex part which the both sides of the back 2nd half cover 122 have fit in the recessed part which the both sides of the back 1st half cover 121 have. With the above operation, as shown in FIG. 8, the front first half cover 111 and the rear second half cover 122 are adjacent to each other in the axial direction, and the front second half cover 112 and the rear first half cover 121 are in the axial direction. Adjacent to. Further, the front first half cover 111 and the front second half cover 112 are engaged with each other in the circumferential direction, and the rear first half cover 121 and the rear second half cover 122 are engaged with each other in the circumferential direction. .

  Finally, the rear cover 12 is rotated by 180 ° in the circumferential direction with respect to the front cover 11 (step S16), and the concave portion 331 of the overlapping portion 311 and the convex portion 341 of the overlapping portion 321 are formed as shown in FIG. The convex portion 332 of the overlapping portion 312 and the concave portion 342 of the overlapping portion 322 are engaged with each other.

  As described above, the cylindrical body 1 can be hermetically covered with the cylindrical cover 1, and the cylindrical cover 1 does not fall off the columnar body 9. It is not necessary to interpose an adhesive between the half covers or between the half covers and the columnar bodies 9. In particular, in a high-temperature corrosive atmosphere or in an environment where thermal stress due to temperature fluctuations repeatedly acts on the cylindrical cover 1, ceramics cannot be properly bonded with an adhesive. Also, the cylindrical cover 1 can be prevented from falling off.

  Even when the cover cannot be inserted from the end of the columnar body 9, the cylindrical cover 1 having a simple structure can be easily attached. For example, even when both ends of the columnar body 9 are supported by a support member protruding from a wall or the like, or are connected to a curved portion, the cylindrical cover 1 is not cut without cutting the columnar body 9. Can be easily attached to the columnar body 9.

  Furthermore, by setting the length of the front cover 11 to approximately L and the length of the rear cover 12 to approximately L, the cylindrical cover 1 can be attached even to the columnar body 9 having a length of 2L. For example, as shown in FIG. 3, the distance from the front end of the front first half cover 111 to the center of the concave portion 331 of the overlapping portion 311, the center of the convex portion 332 of the overlapping portion 312 from the front end of the front second half cover 112. The distance from the rear end of the rear first half cover 121 to the center of the convex portion 341 of the overlapping portion 321, the distance from the rear end of the rear second half cover 122 to the center of the concave portion 342 of the overlapping portion 322 Are designed to be L respectively.

  Although the cylindrical cover 1 is suitable when the length is equal to the length of the columnar body 9, these lengths do not need to be exactly the same. Of course, the length of the cylindrical cover 1 is less than or equal to the length of the columnar body 9. Usually, when the difference between the length of the cylindrical cover and the length of the columnar body 9 is less than the maximum length of the overlapping portion, a working space longer than the length of the columnar body 9 is required during assembly. Therefore, the cylindrical cover 1 is particularly suitable when the difference between its length and the length of the columnar body 9 is less than the maximum length of the overlapping portion. In such a case, the length of the cylindrical cover 1 and the columnar shape are suitable. It can be understood that the length of the body 9 is (substantially) equal.

  In order to enable the above assembling work, the rear cover 12 is rotated 180 degrees around the central axis with respect to the front cover 11 from the state shown in FIG. 1 and FIG. When the half cover 111 and the rear second half cover 122 are adjacent to each other and the front second half cover 112 and the rear first half cover 121 are adjacent to each other, both sides of the rear first half cover 121 and the rear second half half are covered. It is only necessary that the rear first half cover 121 can be inserted and removed between the columnar body 9 and the front second half cover 112 in a state where both sides of the cover 122 are locked in the circumferential direction. In addition, when attaching the cylindrical cover 1 to the columnar body 9 of length 2L, the length x of the front cover 11 is L or more, and the length of the back cover 12 is (2L-x).

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made.

  For example, both side portions 231 of the front first half cover 111 have convex portions extending in the axial direction, both side portions 232 of the front second half cover 121 extend in the axial direction, and the front first half cover 111 You may have a recessed part fitted to a convex part. Both side portions 231 may have a convex portion and a concave portion extending in the axial direction. In any case, the space between the front first half cover 111 and the front second half cover 112 can be appropriately sealed. The same applies to both sides of the rear first half cover 121 and both sides of the rear second half cover 122. In addition, in the side part, the convex part may exist discontinuously in the axial direction.

  The overlapping portion 311 of the front first half cover 111 has a convex portion extending in the circumferential direction instead of the concave portion 331, and the overlapping portion 321 of the rear first half cover 121 is replaced with the convex portion 341, A concave portion extending in the direction may be provided, and the convex portion may fit into the concave portion. The overlapping portion may have a convex portion and a concave portion extending in the circumferential direction. In any case, the space between the front first half cover 111 and the rear first half cover 121 can be appropriately sealed. The same applies to the overlapping portion 312 of the front second half cover 112 and the overlapping portion 322 of the rear second half cover 122. Further, in the above embodiment, the overlapping portion positioned on the radially inner side may be positioned on the radially outer side, and the overlapping portion positioned on the radially outer side may be positioned on the radially inner side.

  In the overlapping portion, the convex portion may exist discontinuously in the circumferential direction. If the relative position of the front cover 11 and the rear cover 12 can be fixed by another means, the convex portion and the concave portion in the overlapping portion may be omitted.

  In the said embodiment, all the half covers are half cylinder shape, However, A half cover is not limited to a half cylinder shape. For example, the cross section of the half cover by a plane perpendicular to the central axis may be a part of a polygon. In this case, the outer surface of the rear first half cover 121 and the front second half are inserted so that the rear first half cover 121 can be inserted into the space 83 in step S13 of FIG. 4 without unnecessarily enlarging the cylindrical cover 1. The inner surface of the cover 112 is preferably substantially the same shape.

  Similarly, from the viewpoint of not unnecessarily enlarging the cylindrical cover 1, when the columnar body 9 is cylindrical, the inner surface of the front first half cover 111 and the inner surface of the rear first half cover 121 are columnar body 9. It is preferable that it is a part of cylindrical surface along the outer peripheral surface. More preferably, as in the above-described embodiment, all the half covers are half cylindrical. If the pair of half covers cover the entire circumference of the columnar body 9, the circumferential range in which each half cover covers the columnar body 9 may be 180 ° or more or 180 ° or less.

  Since the cylindrical cover 1 can be assembled without deforming each half cover, the structure of the cylindrical cover 1 is suitable for a rigid cover. In particular, the above structure is suitable when the cylindrical cover 1 is formed of a brittle material. Moreover, the use of the cylindrical cover 1 is not limited to the covering of the boiler tube, but is used for covering various columnar bodies 9 for the purpose of various sealing such as heat insulation, heat insulation, soundproofing, light shielding, and waterproofing. Good. A filler may be appropriately filled between the cylindrical cover 1 and the columnar body 9. An adhesive may be interposed between the adjacent half covers as necessary. When the columnar body 9 is a boiler tube, for example, mortar is filled between the cylindrical cover 1 and the columnar body 9.

  The configurations in the above embodiment and each modification may be combined as appropriate as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 1 Cylindrical cover 9 Columnar body 11 Front cover 12 Back cover 111 Front 1st half cover 112 Front 2nd half cover 121 Back 1st half cover 122 Back 2nd half cover 241 Concave part 242 Convex part 311, 312, 321, 322 Overlap Matching part 332, 341 Convex part 331, 342 Concave part

Claims (7)

A cylindrical cover covering a linear columnar body,
A front cover;
A rear cover adjacent to the front cover in the axial direction of the columnar body;
With
The front cover is
A half tubular front first half cover extending in the axial direction;
A half-tubular front second half cover covering the opposite side of the columnar body from the front first half cover;
Including
The rear cover is
A half tubular tubular rear first half cover extending in the axial direction;
A half-tubular rear second half cover covering the opposite side of the columnar body from the rear first half cover;
Including
The front first half cover and the rear first half cover are adjacent to each other in the axial direction, and the overlapping portion of the front first half cover is between the front first half cover and the rear first half cover. And the overlapping portion of the rear first half cover overlap in the radial direction of the columnar body,
The front second half cover and the rear second half cover are adjacent to each other in the axial direction, and the overlapping portion of the front second half cover is between the front second half cover and the rear second half cover. And the overlapping portion of the rear second half cover overlap in the radial direction,
Both sides of the front first half cover in the circumferential direction of the columnar body are locked in relation to the circumferential direction with respect to both sides of the front second half cover in the circumferential direction, and are slidable in the axial direction. Yes,
Both sides of the rear first half cover in the circumferential direction are locked in relation to the circumferential direction with respect to both sides of the rear second half cover in the circumferential direction, and are slidable in the axial direction.
The rear cover is rotatable in the circumferential direction with respect to the front cover, the front first half cover and the rear second half cover are adjacent to each other in the axial direction, and the front second half cover and the rear When the first half cover is adjacent, the columnar body in a state where the both side portions of the rear first half cover and the both side portions of the rear second half cover are locked in the circumferential direction. The cylindrical cover, wherein the rear first half cover can be inserted and removed between the front second half cover. The cylindrical cover according to claim 1,
The both side portions of the front first half cover have convex portions or concave portions extending in the axial direction, the both side portions of the front second half cover extend in the axial direction, and the front first half cover A concave portion or a convex portion that fits into the convex portion or the concave portion of the both side portions;
The both side portions of the rear first half cover have convex portions or concave portions extending in the axial direction, the both side portions of the rear second half cover extend in the axial direction, and the rear first half cover A cylindrical cover having concave portions or convex portions that fit into the convex portions or the concave portions of the both side portions. The cylindrical cover according to claim 1 or 2,
The overlapping portion of the front first half cover has a convex portion or a concave portion extending in the circumferential direction, and the overlapping portion of the rear first half cover extends in the circumferential direction, and the front first half A concave portion or a convex portion that fits into the convex portion or the concave portion of the overlapping portion of the cover;
The overlapping portion of the front second half cover has a convex portion or a concave portion extending in the circumferential direction, and the overlapping portion of the rear second half cover extends in the circumferential direction, and the front second half A cylindrical cover having a concave portion or a convex portion that fits into the convex portion or the concave portion of the overlapping portion of the cover. A cylindrical cover according to any one of claims 1 to 3,
An inner surface of the front first half cover and an inner surface of the rear first half cover are part of a cylindrical surface. The cylindrical cover according to any one of claims 1 to 4,
The cylindrical front cover, wherein the first front half cover, the second front half cover, the first rear half cover, and the second rear half cover are half-cylindrical. A cylindrical cover according to any one of claims 1 to 5,
A cylindrical cover formed of a brittle material. The cylindrical cover according to any one of claims 1 to 6,
Both ends of the columnar body are connected to the curved portion or supported by a support member,
A cylindrical cover characterized in that a length of the columnar body is equal to a length of the cylindrical cover.

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