JP2011080245A - Sleeve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sleeve which dispenses with gap filling work, and which is equipped with both a highly-heat-insulated structure and a soundproof one. <P>SOLUTION: This sleeve includes: an approximately box-shaped sleeve body 2 which is almost identical in thickness to a partition 100 and which penetrates in the thickness direction of the partition 100; a sleeve pipe 4 which is arranged inside the sleeve body 2, which penetrates in the thickness direction of the sleeve body 2, and both the ends of which can be connected to ducts 107 and 108 for air conditioning; a fire-resisting and heat-insulating material 6 which is held inside the sleeve body 2, and which elastically supports the sleeve pipe 4; and a regulating flange 5 which is protruded radially outward from an outer surface of the sleeve pipe 4 and which regulates the axial motion of the sleeve pipe 4 by contact with the fire-resisting and heat-insulating material 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sleeve for passing an air conditioning duct through a wall such as a lightweight partition.

  When an air conditioning duct is passed through a lightweight partition in a building, it is necessary to open a through hole at a predetermined position of the lightweight partition. FIG. 9 shows a conventional mounting structure of an air conditioning sleeve 110. As shown in FIG. 9, the sleeve 110 is obtained by inserting a cylindrical sleeve tube 112 into a box-shaped sleeve body 111, and the sleeve tube 112 is fixed to the sleeve body 111 by welding W. When the sleeve 110 is attached to the lightweight partition 100, a through hole 105 having a diameter larger than that of the sleeve 110 is formed in the wall plates 101 and 102 of the lightweight partition 100, and the air conditioning sleeve 110 is passed through the through hole 105, and the sleeve tube 112. Are arranged so that both end portions of the plate protrude from the wall plates 101 and 102. The gap between the through hole 105 and the air conditioning sleeve 110 is filled with a refractory material such as rock wool 113.

  2. Description of the Related Art Conventionally, as an example of a technique for attaching a sleeve to a wall such as a lightweight partition, a structure in which an anti-vibration rubber is provided between a sleeve body and a sleeve tube is known (see, for example, Patent Document 1).

Utility Model Registration No. 3105895

  However, in the sleeve 110 shown in FIG. 9, since the sleeve tube 112 is fixed to the sleeve body 111 by welding W, vibration due to the flow of conditioned air passing through the sleeve tube 112 is directly transmitted from the sleeve tube 112 to the sleeve body 111. There is a problem that noise is increased. Further, in the case of FIG. 9, after the lightweight partition 100 is completed, it is necessary to open the through holes 105 in the wall plates 101 and 102 according to the size of the air conditioning sleeve 110, and the through holes 105 and the air conditioning sleeve 110. There is a problem in that it is necessary to fill the gap with the above, and it takes time and labor for the work at the site, which increases the construction cost.

  When a vibration-proof rubber is provided between the peripheral edge of the through hole of the sleeve body and the sleeve tube as in Patent Document 1, vibration can be reduced, but there is a problem in terms of fire resistance. That is, from the viewpoint of fire resistance, it is desirable to have a heat insulating structure that can sufficiently suppress the amount of heat transfer between the sleeve tube and the sleeve body, and even if the sleeve tube becomes hot during a fire, the sleeve body It is necessary to prevent the side from becoming extremely hot.

  Accordingly, an object of the present invention is to provide a sleeve that does not require a hole filling operation and has both a high heat insulating structure and a soundproof structure.

  In order to achieve the above object, the invention according to claim 1 is a sleeve attached to a partition where a wall plate is attached to a frame and connected to an air conditioning duct, and has a thickness substantially equal to the thickness of the partition. A substantially box-shaped sleeve main body penetrating in the thickness direction of the partition; a sleeve pipe disposed inside the sleeve main body, penetrating in the thickness direction of the sleeve main body and having both axial ends connectable to the air conditioning duct; The axial movement of the sleeve tube by contact with the refractory heat insulating material that is held inside the sleeve body and elastically supports the sleeve tube, and protrudes radially outward from the outer surface of the sleeve tube. A sleeve characterized by comprising a restriction rod for restricting.

  According to this invention, since the fireproof heat insulating material that elastically supports the sleeve tube is provided between the sleeve tube and the sleeve body, the vibration transmitted from the sleeve tube to the sleeve body is absorbed, and the sleeve tube is The amount of heat transfer to the sleeve body is suppressed.

  According to a second aspect of the present invention, in the sleeve according to the first aspect, the heat-resistant heat insulating material includes a first heat insulating material and a second heat insulating material, and the first heat insulating material is the sleeve. The second heat insulating material is located at the end of the sleeve body in the thickness direction, and is located at the center of the body in the thickness direction.

  According to the first aspect of the present invention, since the sleeve tube connected to the air conditioning duct is elastically supported by the fireproof heat insulating material, the vibration transmitted from the sleeve tube to the sleeve body is sufficiently absorbed by the fireproof heat insulating material. It can absorb, and the noise by the flow of conditioned air can be reduced. In addition, the amount of heat transfer from the sleeve tube to the sleeve body can be suppressed by the fireproof heat insulating material, and the fireproof performance of the sleeve can be enhanced. Further, since the outer surface of the sleeve tube is provided with a restriction rod protruding outward in the radial direction, the sleeve tube moves in the axial direction with respect to the fireproof insulation material by contact between the restriction rod and the fireproof insulation material. Can be prevented.

  Furthermore, since the refractory heat insulating material is disposed inside the sleeve body, the wall plate can be attached so as to surround the sleeve after the sleeve is attached to the partition frame. This eliminates the need for a hole filling operation after attachment to the sleeve partition as in the prior art, thereby reducing the construction cost on site.

  According to the invention described in claim 2, since the second heat insulating material is positioned at the end of the sleeve body in the thickness direction, the sleeve body is formed into a square cylinder and the sleeve tube is formed into a cylinder. However, the clearance between the outer surface of the sleeve tube and the inner surface of the sleeve main body at the end in the thickness direction of the sleeve main body can be filled with the fireproof heat insulating material, and the fireproof performance of the sleeve can be improved.

It is sectional drawing of the sleeve concerning Embodiment 1 of this invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view which shows the state which attached the sleeve of FIG. 1 to the partition. It is a perspective view which shows the modification of the sleeve of FIG. It is sectional drawing of the sleeve concerning Embodiment 2 of this invention. It is a front view which follows BB of FIG. It is sectional drawing of the sleeve concerning Embodiment 3 of this invention. FIG. 8 is a cross-sectional view of the sleeve of FIG. 7. It is a perspective view which shows the attachment state to the partition of the conventional sleeve.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 3 show Embodiment 1 of the present invention. As shown in FIG. 3, the partition 100 includes a front side wall plate 101, a rear side wall plate 102, a vertical frame 104, an upper horizontal frame 104, and a lower horizontal frame 105. The partition 100 is provided with a sleeve 1 connected to the air conditioning ducts 107 and 108 shown in FIG.

  The sleeve 1 has a sleeve main body 2, a sleeve tube 4, a restriction rod 5, and rock wool 6 as a fireproof heat insulating material. The sleeve body 2 has substantially the same thickness as the thickness T of the partition 100. The sleeve body 2 is formed in a substantially box shape penetrating in the thickness T direction of the partition. As shown in FIG. 2, the sleeve body 2 includes an upper plate 2a, a lower plate 2b, side plates 2b and 2c, and end plates 2e and 2f. Each plate 2a-2f is joined by a screw or a rivet. One end plate 2e is formed with a through hole 2e1 into which one of the sleeve tubes 4 is inserted. The other end plate 2e is formed with a through hole 2f1 into which the other sleeve tube 4 is inserted. To the upper plate 2 a of the sleeve main body 2, a lifting tool 3 used when the sleeve 1 is attached to each frame 103 to 105 of the partition 100 is fixed. A hanging hole 3a is formed in the hanging tool 3 for passing a wire or a string (not shown).

  A sleeve tube 4 formed in a cylindrical shape is disposed inside the sleeve body 2. The sleeve tube 4 and the sleeve body 2 are disposed concentrically with respect to the axis C. The sleeve tube 4 penetrates in the thickness direction of the sleeve body 2 through the through hole 2e1 and the through hole 2f1, and a flow path F1 is formed along the axis C inside the sleeve tube 4. The inner diameters of the through-hole 2e1 and the through-hole 2f are such that the outer surface of the sleeve tube 4 is the through-hole 2e1 and the through-hole 2f when the rock wool 6 is interposed between the inner surface of the sleeve body 1 and the outer surface of the sleeve tube 4. The size is set so as not to contact the inner periphery of the.

  One end 4 a of the sleeve tube 4 protrudes from an end plate 2 e located at the end of the sleeve body 2 in the axial direction. Similarly, the other end 4 b of the sleeve tube 4 protrudes from an end plate 2 f located at the end of the sleeve body 2 in the axial direction. One end 4 a of the sleeve tube 4 is connected to an air conditioning duct (spiral duct) 107 located on the side wall plate 101 side of the partition 100. The other end 4 b of the sleeve tube 4 is connected to an air conditioning duct (spiral duct) 107 located on the side wall plate 102 side of the partition 100.

  Between the inner surface of the sleeve body 2 and the outer surface of the sleeve tube 4, rock wool 6 is provided as a heat-resistant heat insulating material. As is well known, the rock wool 6 is an artificial mineral fiber and is suitable as a heat insulating material, a sound absorbing material, and a fireproof coating material. The rock wool 6 is wound in the circumferential direction along the outer surface of the sleeve tube 4, and the outer peripheral surface is in contact with the inner surface of the sleeve body 2. Since the rock wool 6 can be elastically deformed with an appropriate external force, the sleeve tube 4 is elastically supported by the rock wool 6. In the first embodiment, as shown in FIG. 4, since the rock wool 6 is wound in a cylindrical shape, the outer peripheral surface of the rock wool 6 is one of the inner surfaces of the plates 2 a to 2 d in the sleeve body 2. In contact with the part. Thereby, spaces S are formed at the four corners inside the sleeve body 2.

  A restriction rod 5 protruding outward in the radial direction is fixed to the outer surface of the sleeve tube 4. The restriction rod 5 is located substantially at the center in the axial direction of the sleeve tube 4, and the entire portion bites into the rock wool 6. As a result, the sleeve tube 4 is prevented from moving in the axial direction with respect to the rock wool 6. In addition to restricting the axial movement of the sleeve tube 4, the restriction rod 5 has a function of reducing the axial vibration of the sleeve tube 14 by contact with the rock wool 6.

  Next, a procedure for attaching the sleeve 1 in the first embodiment will be described.

  As shown in FIG. 3, the sleeve 1 is attached to the partition 100 in a state where the wall plates 101 and 102 are not attached to the frames 103 to 105. Here, when the sleeve 1 is fixed to each frame 103 to 105, for example, a string (not shown) is first passed through the suspension 3 of the sleeve 1, and the sleeve 1 is attached to at least each of the frames 103 to 105 using this string. Temporarily fix to either. Thereafter, the sleeve 1 is fixed to the frames 103 to 105 using a fixing tool (not shown) such as a screw. After fixing the sleeve 1, the periphery of the sleeve 1 is surrounded by wall plates 101 and 102, and the wall plates 101 and 102 are attached to the frames 103 to 105 to complete the partition 100. In a state where the sleeve 1 is attached to the partition 100, the end of the sleeve tube 4 protrudes from the partition 100, and air conditioning ducts 107 and 108 are connected to both ends of the sleeve tube 4, respectively.

  Thus, unlike the prior art of FIG. 9, the rock wool 6 is disposed inside the sleeve main body 4 in the sleeve 1, so that the sleeve 1 is attached to each frame 103 to 105 of the partition 100 before the sleeve 1. The wall plates 101 and 102 can be attached so as to surround the periphery. Therefore, the hole filling work after the attachment to the partition 100 of the sleeve 1 becomes unnecessary, and the construction cost can be reduced.

  Next, the operation of the sleeve 1 in the first embodiment will be described.

  During air conditioning, conditioned air K flows from the air conditioning duct 107 side to the air conditioning duct 108 side through the sleeve pipe 4 of the sleeve 1. In this state, the sleeve tube 4 is vibrated by the inflowing conditioned air K. However, since the sleeve tube 4 is elastically supported by the rock wool 6, it is orthogonal to the axial direction transmitted from the sleeve tube 4 to the sleeve body 2. The vibration in the direction (perpendicular to the axis C) can be sufficiently absorbed by the rock wool 6, and the noise caused by the conditioned air K can be reduced. Further, the heat transfer amount from the sleeve tube 4 to the sleeve main body 2 can be suppressed by the rock wool 6, and the fire resistance of the sleeve 1 can be improved. That is, it is conceivable that high-temperature air flows into the sleeve tube 4 in the event of a fire, but between the sleeve tube 4 and the sleeve body 2, rock wool 6 having a thickness sufficiently considering fire resistance is interposed. Thus, the amount of heat transfer from the sleeve tube 4 to the sleeve body 2 can be remarkably suppressed, and the sleeve body 2 can be prevented from reaching a high temperature.

  In addition, since a restriction rod 5 protruding radially outward is fixed to the outer surface of the sleeve tube 4, the sleeve tube 4 is axially moved with respect to the lock wool 6 by contact between the restriction rod 5 and the rock wool 6. Can be prevented from moving to. Further, since the entire regulation rod 5 is in a state of being bitten into the rock wool 6, the regulation rod 5 and the rock wool 6 are in sufficient contact, and the axial vibration of the sleeve tube 4 due to the conditioned air K is also caused. It can be absorbed and the noise reduction effect can be further enhanced.

(Embodiment 2)
5 and 6 show a second embodiment of the present invention.

  As shown in FIG. 5, the sleeve 11 has a sleeve main body 12, a sleeve tube 14, a restriction rod 15, and rock wool 16 as a fireproof heat insulating material. As shown in FIG. 6, the sleeve main body 12 includes an upper plate 12a, a lower plate 12b, side plates 12b and 12c, and end plates 12e and 12f. The plates 12a to 12f are joined by screws or rivets. One end plate 12e is formed with a through hole 12e1 into which one of the sleeve tubes 14 is inserted. The other end plate 12e is formed with a through hole 12f1 into which the other sleeve tube 14 is inserted. A suspension 13 used to attach the sleeve 1 to each frame 103 to 105 of the partition 100 is fixed to the upper plate 12 a of the sleeve body 12. A hanging hole 13a is formed in the hanging tool 13 for passing a wire or a string (not shown).

  Inside the sleeve body 12, a sleeve tube 14 having a square cross-sectional shape is disposed. The sleeve tube 14 and the sleeve body 12 are arranged concentrically with respect to the axis C. The sleeve tube 14 passes through the through hole 12e1 and the through hole 12f1 in the thickness direction of the sleeve main body 12, and a flow path F2 is formed along the axis C inside the sleeve tube 14. The inner diameters of the through hole 12e1 and the through hole 12f are such that the outer surface of the sleeve tube 14 is the through hole 12e1 and the through hole 12f when the rock wool 16 is interposed between the inner surface of the sleeve body 11 and the outer surface of the sleeve tube 14. The size is set so as not to contact the inner periphery of the.

  One end portion 14 a of the sleeve tube 14 protrudes from an end plate 12 e located at the end portion of the sleeve body 12 in the axial direction. Similarly, the other end 14 b of the sleeve tube 14 protrudes from an end plate 12 f located at the end of the sleeve body 12 in the axial direction. One end portion 14 a of the sleeve tube 14 is connected to the air conditioning duct 107. The other end 14 b of the sleeve tube 14 is connected to the air conditioning duct 107.

  Between the inner surface of the sleeve body 12 and the outer surface of the sleeve tube 14, rock wool 16 is provided as a fireproof heat insulating material. The rock wool 16 is wound in the circumferential direction along the outer surface of the sleeve tube 14, and the outer peripheral surface is in contact with the inner surface of the sleeve main body 12. Since the rock wool 16 can be elastically deformed with an appropriate external force, the sleeve tube 14 is elastically supported by the rock wool 16. In the second embodiment, since the rock wool 16 is wound in a square shape along the outer peripheral surface of the sleeve tube 14, the outer peripheral surface of the rock wool 16 is the inner surface of each of the plates 12 a to 12 d in the sleeve main body 12. It is almost in contact with the entire surface.

  A restriction rod 15 protruding outward in the radial direction is fixed to the outer surface of the sleeve tube 14. The restriction rod 15 is located substantially at the center in the axial direction of the sleeve tube 14, and the entire portion bites into the rock wool 16. The sleeve tube 14 is prevented from moving in the axial direction with respect to the rock wool 16 by the restriction rod 5. In addition to restricting the movement of the sleeve tube 14, the restriction rod 15 has a function of reducing the axial vibration of the sleeve tube 14 by contact with the rock wool 16.

  In the second embodiment configured as described above, the sleeve tube 14 is formed in a square shape, so that the rock wool 16 comes into contact with the entire inner surface of the sleeve body 12. Thereby, the space S as shown in FIG. 2 in the first embodiment is hardly formed, and the fire resistance can be improved as compared with the first embodiment. Further, since a restriction rod 15 bulging outward in the radial direction is fixed to the outer surface of the sleeve tube 14, the sleeve tube 14 is pivoted with respect to the lock wool 16 by the contact between the restriction rod 15 and the rock wool 16. Can be prevented from moving in the direction. Further, since the entire restriction rod 15 is in a state of being bitten into the rock wool 16, the restriction rod 15 and the rock wool 16 are in sufficient contact, and the axial vibration of the sleeve tube 14 due to the conditioned air K is also caused. It can be absorbed and the noise reduction effect can be further enhanced.

(Embodiment 3)
7 and 8 show a third embodiment of the present invention.

  As shown in FIG. 7, the sleeve 21 has a sleeve main body 22, a sleeve tube 24, a regulation rod 25, and rock wool 26 as a fireproof heat insulating material. As shown in FIG. 8, the sleeve body 22 formed in a substantially box shape has an upstream end plate 22a and a downstream end plate 22b that can be divided in the axial direction (direction along the axis C). A through hole 22a1 into which one of the sleeve tubes 24 is inserted is formed in the upstream end plate 22a. The downstream end plate 22b has a through hole 22b1 into which the other sleeve tube 24 is inserted. The sleeve body 22 is fixed with a hanging tool 23 used when the sleeve 21 is attached to each of the frames 103 to 105 of the partition 100.

  A sleeve tube 24 formed in a cylindrical shape is disposed inside the sleeve body 22. The sleeve tube 24 penetrates in the thickness direction of the sleeve body 22, and a flow path F <b> 3 is formed along the axis C inside the sleeve tube 24. One end of the sleeve tube 24 protrudes from the upstream end plate 22 a of the sleeve body 24. Similarly, the other end of the sleeve tube 24 protrudes from the downstream end plate 22 b of the sleeve body 22.

  Between the inner surface of the sleeve body 22 and the outer surface of the sleeve tube 24, rock wool 26 is provided as a heat-resistant heat insulating material. In this Embodiment 3, the rock wool 26 is comprised from the 1st heat insulating material 26a and the 2nd heat insulating materials 26b and 26c. The first heat insulating material 6 a is located at the center of the sleeve main body 22 in the thickness direction, and the second heat insulating materials 26 b and 26 c are located at the end of the sleeve main body 22 in the thickness direction.

  The first heat insulating material 26 a is wound in the circumferential direction along the outer surface of the sleeve tube 24, and the outer peripheral surface is in contact with the inner surface of the sleeve main body 22. Since the first heat insulating material 26a can be elastically deformed with an appropriate external force, the sleeve tube 24 is elastically held by the first heat insulating material 26a. In the third embodiment, since the first heat insulating material 26a is wound in a cylindrical shape along the outer peripheral surface of the sleeve tube 24, the outer peripheral surface of the first heat insulating material 26a is the upstream end plate. A portion of the inner surface of the central portion of the sleeve main body 22 excluding 22a and the downstream end plate 22b is in contact.

  A second heat insulating material 26b is provided on the inner surface of the upstream end plate 22a. The second heat insulating material 26b has a function of elastically supporting one of the sleeve tubes 24 and enhancing the fire resistance performance on the inner surface side of the upstream end plate 22a. Similarly, a second heat insulating material 26c is provided on the inner surface of the downstream end plate 22b. The second heat insulating material 26c elastically supports the other of the sleeve tubes 24 and has a function of improving the fire resistance performance on the inner surface side of the downstream end plate 22b.

  Two restricting rods 25 protruding outward in the radial direction are fixed to the outer surface of the sleeve tube 24. The restricting rods 25 are provided at predetermined intervals in the axial direction of the sleeve tube 24. One restriction rod 25 is sandwiched between the first heat insulating material 26a in the center and the first heat insulating material 26b on the upstream end plate 22a side. The other restriction rod 25 is sandwiched between the first heat insulating material 26a at the center and the second heat insulating material 26c on the downstream end plate 22b side. The sleeve tube 24 is prevented from moving in the axial direction by the two restriction rods 5. In addition to restricting the axial movement of the sleeve tube 24, each regulating rod 25 has a function of reducing the axial vibration of the sleeve tube 24 through contact with the heat insulating materials 26a, 26b, and 26c.

  In Embodiment 3 configured as described above, the second heat insulating material 26b is provided on the inner surface side of the upstream end plate 22a, and the second heat insulating material 26c is provided on the inner surface side of the downstream end plate 22b. Therefore, even when the sleeve tube 24 is formed in a cylindrical shape, it is between the outer surface of the sleeve tube 24 and the inner surface of the upstream end plate 22a and the inner surface of the downstream end plate 22b at the end in the thickness direction of the sleeve body 22. The gap can be filled with a fireproof heat insulating material, and the fireproof performance of the sleeve 21 can be enhanced. That is, in the first embodiment, since the rock wool 6 is wound in a cylindrical shape, large spaces S are formed at the four corners of the end portion in the thickness direction of the sleeve body 22 as shown in FIG. 3, by using the second heat insulating materials 26 b and 26 c, a gap corresponding to the space S in FIG. 2 is not formed, and the fire resistance of the sleeve 21 can be improved.

  In addition, the sleeve tube 24 is sandwiched between the first heat insulating material 26a and the second heat insulating material 26c, and the first heat insulating material 26a and the second heat insulating material 26c. Since the other restriction rod 25 is provided, the sleeve tube 24 can be prevented from moving in the axial direction of each of the heat insulating materials 26a, 26b, 26c by vibration. Furthermore, when each regulation rod 25 and each heat insulating material 26a, 26b, 26c contact, the axial vibration of the sleeve tube 24 by the conditioned air K can be absorbed, and the noise reduction effect can be further enhanced.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, in the first embodiment, the sleeve body 2 is provided with one sleeve tube 4, but as shown in FIG. 4, the sleeve body 2 may be provided with a plurality of sleeve tubes 4. In each embodiment, the rock wool 6, 16, 26 is used as the fireproof heat insulating material. However, the rock wool is limited to rock wool as long as it is a member having moderate elasticity and sufficient fire resistance. It will never be done.

1 Sleeve 2 Sleeve body 4 Sleeve tube 5 Regulatory rod 6 Rock wool
11 Sleeve 12 Sleeve body 14 Sleeve tube 15 Regulatory rod 16 Rock wool (fireproof insulation)
21 Sleeve 22 Sleeve body 22a Upstream end plate 22b Downstream end plate 24 Sleeve tube 25 Regulatory rod 26 Rock wool (fireproof heat insulating material)
26a first heat insulating material 26b second heat insulating material 26c second heat insulating material 100 partition 101 wall plate 102 wall plate 103 frame 104 frame 105 frame K conditioned air

Claims (2)

A sleeve that is attached to a partition where a wall plate is attached to the frame and is connected to an air conditioning duct,
A substantially box-shaped sleeve body having substantially the same thickness as the partition and penetrating in the thickness direction of the partition;
A sleeve tube disposed inside the sleeve body and penetrating in the thickness direction of the sleeve body and having both axial ends connected to the air conditioning duct;
A heat-resistant insulating material that is held inside the sleeve body and elastically supports the sleeve tube;
A restriction rod that protrudes radially outward from the outer surface of the sleeve tube and restricts the axial movement of the sleeve tube by contact with the heat-resistant heat insulating material;
A sleeve characterized by comprising.   The fireproof heat insulating material is composed of a first heat insulating material and a second heat insulating material, the first heat insulating material is located at a central portion in the thickness direction of the sleeve body, and the second heat insulating material is The sleeve according to claim 1, wherein the sleeve is located at an end portion in a thickness direction of the sleeve main body.

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