Protective member for heat-resistant piping

Abstract

To enable a flexible metal casing to be easily attached and detached in a protective member for heat-resistant piping.SOLUTION: A protective member for heat-resistant piping including a metal casing 30 and a jig 40 further includes a nipple 50, a rotary adapter 60, a cylindrical socket 70, and an annular stopper 80, makes the metal casing 30 as an interlock tube with spiral irregularities 32 formed at its periphery by engaging overlapping parts of a metal belt-like member 31 while spirally winding the belt-like member 31, makes the jig 40 include a jig bottom plate part 41 provided with an opening 41a for deriving a pipe body 10 or its connection member from the metal casing 30, and a jig cylindrical part 42 erecting from its peripheral edge parts of the jig bottom plate part 41, and provides irregularities 42 for engagement to be engaged with the spiral irregularities 32 at an inner peripheral part of the jig cylindrical part 42.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a protective member for heat-resistant piping. [Background technology]

[0002] Various pipes are connected to the furnaces in steelworks to supply oil and gas. These pipes may also be connected to moving parts of coke ovens. In such cases, the pipes are made of flexible hoses so that they can follow the movements of the moving parts.

[0003] In addition, as the furnace is operated repeatedly, the inner wall of the furnace becomes worn and peels off, and this is repaired by supplying refractory material from outside the furnace into the furnace and spraying it onto the inner wall of the furnace. Flexible hoses are also used to supply the refractory material.

[0004] These hoses are designed to be heat resistant because they are used in high-temperature environments. Various types of heat resistant hoses have been proposed so far.

[0005] For example, Fig. 3 of Patent Document 1 shows a heat-resistant hose 20 in which the outer periphery of a hose 21 is covered with a first protective member 22 and a second protective member 23. A heat insulating material made of inorganic fibers such as ceramic fibers is used as the first protective member 22 (paragraph 0018 of the same document). Meanwhile, a metal mesh or woven fabric is used as the second protective member 23 (paragraph 0019 of the same document). Both the first protective member 22 and the second protective member 23 are configured to have heat resistance of 500°C or more and flexibility.

[0006] Also, Fig. 2 of Patent Document 2 shows a heat-resistant hose 100 having a structure in which the outer periphery of a rubber hose 10 is covered with a heat-resistant member 20, and the heat-resistant member 20 is covered with a metal casing 30 with an air layer 40 in between. The heat-resistant member 20 is a glass braid made by weaving glass yarn into a tube shape (paragraph 0015 of the same document). On the other hand, as shown in Fig. 3 of the same document, the metal casing 30 is made of a number of SUS metal ring bodies 31 connected in a bellows shape, and has flexibility (paragraph 0016 of the same document). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2003-322477 A [Patent Document 2] JP 2018-112270 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, the heat-resistant hose of Patent Document 1 cannot be used for a long period of time in a harsh environment such as a coke oven. This is because the heat-resistant hose used in a coke oven may be directly hit by scattered red-hot coke and may be perforated. A heat-resistant hose such as that of Patent Document 1 generally needs to be replaced in about 1 to 3 months, depending on the specific installation location, etc.

[0009] On the other hand, the heat-resistant hose of Patent Document 2 has a metal casing on the outside, so that the rubber hose inside can be protected from the impact of flying red-hot coke, etc. This can extend the life of the rubber hose. However, there are still cases where the rubber hose must be replaced. In such cases, the metal casing must be removed from the rubber hose. However, the heat-resistant hose of Patent Document 2 has a drawback in that the metal casing cannot be easily removed.

[0010] This is because, as shown in Fig. 3 of Patent Document 2, the heat-resistant hose of Patent Document 2 has a third cap 32 placed on the end of the metal casing 30, and the third cap 32 is tightened from the outside, thereby fixing the metal casing 30 to the rubber hose 10 (paragraph 0018 of the same document). Therefore, in order to remove the metal casing 30, it is necessary to deform the third cap 32.

[0011] Furthermore, in the heat-resistant hose of Patent Document 2, the metal casing 30 is plastically deformed by crimping when it is attached to the rubber hose 10. For this reason, even if only the rubber hose 10 is worn out and the metal casing 30 is not (when only the rubber hose 10 needs to be replaced), the metal casing 30 may also need to be replaced with a new one. It is uneconomical to have to replace the metal casing 30 when only the rubber hose 10 needs to be replaced.

[0012] The present invention has been made to solve the above-mentioned problems, and aims to provide a heat-resistant piping protective member that can cover the periphery of the piping body with a flexible metal casing, and that can easily attach and detach the metal casing. [Means for solving the problem]

[0013] The above issues are: A flexible metal casing that covers the outer periphery of the piping body; A jig attached to the end of the metal casing to restrict the movement of the metal casing relative to the piping body; A heat-resistant piping protective member comprising: The metal casing is an interlock tube having a spirally uneven outer or inner periphery formed by winding a metal strip-shaped member in a spiral shape and engaging the overlapping portions of the strip-shaped member, The jig is A jig bottom plate portion provided with an opening (an opening having an inner diameter smaller than the outer diameter of the metal casing) for leading out the piping main body or its connection parts from the metal casing; A jig cylindrical portion rising from the peripheral portion of the jig bottom plate portion; Equipped with The inner or outer periphery of the jig tubular portion is provided with a recess or projection for screwing into the spiral recess or projection. It was considered A heat-resistant piping protection member characterized by This is solved by providing

[0014] In the heat-resistant piping protective member of the present invention, A nipple press-fitted into the end of the piping body; a rotating adapter connected to an end of the nipple opposite to the end press-fitted into the piping body; A cylindrical socket that is crimped to the outer periphery of the pipe body and the nipple while straddling the pipe body and the nipple; A ring-shaped stopper is an annular member fitted onto the cylindrical socket, and when the jig tries to move toward the piping body, the stopper abuts against the bottom plate of the jig to restrict the movement of the jig so that the jig does not penetrate further into the piping body. It also has:

[0015] As described above, the outer and inner circumferential parts of the interlock tube are formed with helical irregularities. In this regard, the heat-resistant piping protection member of the present invention employs a structure in which the helical irregularities of the interlock tube are used as a screw groove or thread (the helical irregularities are screwed into the screwing irregularities provided on the jig tubular part), thereby directly screwing the jig tubular part to the interlock tube. By employing this structure, the jig can be firmly fixed to the interlock tube without crimping the jig tubular part.

[0016] The above-mentioned unevenness for screwing may be provided on either the inner periphery or the outer periphery of the jig tubular part. When unevenness for screwing is provided on the inner periphery of the jig tubular part, the jig tubular part is attached to the interlock tube in a state in which it surrounds the end of the interlock tube (covering the outside of the interlock tube), and the unevenness for screwing is screwed into the unevenness on the outer periphery of the interlock tube. On the other hand, when unevenness for screwing is provided on the outer periphery of the jig tubular part, the jig tubular part is attached to the interlock tube in a state in which it is enclosed in the end of the interlock tube (inserted inside the interlock tube), and the unevenness for screwing is screwed into the unevenness on the inner periphery of the interlock tube. The unevenness for screwing is also usually formed in a spiral shape.

[0017] In addition, the jig can be attached to the interlock tube by twisting it in one direction relative to the interlock tube, and can be removed from the interlock tube by twisting it in the other direction. That is, the jig can be easily attached to and detached from the interlock tube without using tools or the like. Furthermore, there is no need to destroy the interlock tube or the jig when attaching or detaching the jig. Furthermore, there is almost no risk of the interlock tube or the jig being plastically deformed during the attachment or detachment. Therefore, the interlock tube after the jig is removed and the jig removed from the interlock tube can be used as they are. Therefore, replacement of the piping body, etc. can be performed economically.

[0018] An interlock tube is made by winding a metal strip into a spiral shape and interlocking the overlapping portions of the strip, and there are several types of interlock tubes depending on the interlocking form of the overlapping portions, etc. For example, there are those called "casing tubes" and "semi-interlock tubes."

[0019] Of these, the "casing tube" is The above-mentioned belt-shaped member may be An outwardly extending band-shaped member having both side edges extending outward (to the radially outer side of the interlock tube); An inward-facing band-shaped member with both side edges raised inward (diametrically inward of the interlock tube); Using In the process of spirally winding the outward belt-shaped member, the inward belt-shaped member is fitted from the outside into the gap portion of the outward belt-shaped member (the gap portion formed in a spiral shape) and wound in a spiral shape, resulting in a structure in which the upright portion of the outward belt-shaped member and the upright portion of the inward belt-shaped member are interlocked.

[0020] Also, "semi-interlock tube" means The belt-shaped member is one in which one side edge is folded back on the outer side to form a U-shaped cross section, and the other side edge is folded back on the inner side to form a U-shaped cross section (a member bent into an S-shaped cross section as a whole), In the process of winding the belt-shaped member in a spiral shape, a folded portion of the belt-shaped member in one winding row is engaged with a folded portion of the belt-shaped member in the adjacent winding row.

[0021] In the heat-resistant piping protection member of the present invention, various interlock tubes can be used as the metal casing, but it is preferable to use a semi-interlock tube. This strengthens the meshing of the strip-shaped member in the interlock tube (metal casing), thereby improving the durability of the interlock tube. In addition, since the interlock tube (metal casing) is less likely to expand and contract, the dimensions and shape of the spiral irregularities formed on the outer or inner circumference of the interlock tube can be stabilized. If the dimensions and shape of the spiral irregularities are stable, it becomes easier to screw a jig into the interlock tube.

[0022] In the heat-resistant piping protective member of the present invention, a device (such as a pump) for supplying a fluid into the piping body and a device (such as a nozzle) for ejecting the fluid flowing through the piping body are connected to the rotating adapter. By using a nipple and a rotating adapter, it is possible to increase the degree of freedom in handling the piping (heat-resistant piping) to which the heat-resistant piping protective member is attached, while making it difficult for the fluid to leak from the connection between the piping body and the above-mentioned devices.

[0023] In addition, by crimping the cylindrical socket while straddling the pipe body and the nipple, it is possible to prevent the nipple from coming off the pipe body. This cylindrical socket is crimped and plastically deformed when attached to the pipe body, so when the pipe body is replaced, it must be replaced with a new one. However, since it is a small and inexpensive part, it is more economical than replacing the entire metal casing.

[0024] Furthermore, by providing the annular stopper, it becomes possible to restrict the position of the jig in the longitudinal direction of the piping body (the position of the end of the metal casing in the longitudinal direction of the piping body) within a predetermined range. In addition, the outer peripheral surface of the annular stopper abuts against the inner peripheral surface of the metal casing, so that it becomes possible to restrict the position of the jig in the radial direction of the piping body. Therefore, it is also possible to center the piping body relative to the metal casing and form a predetermined gap (air layer) between the inner peripheral surface of the metal casing and the outer peripheral surface of the piping body.

[0025] In the heat-resistant piping protective member of the present invention, The maximum outer diameter of the cylindrical socket and the maximum outer diameter of the nipple are set smaller than the inner diameter of the opening in the bottom plate portion of the jig; It is also preferable that the maximum outer diameter of the rotating adapter is set to be larger than the inner diameter of the opening in the bottom plate of the jig.

[0026] By making the maximum outer diameter of the cylindrical socket and the maximum outer diameter of the nipple smaller than the inner diameter of the opening in the jig bottom plate portion, it becomes possible for the nipple and the cylindrical socket to pass through the opening in the jig bottom plate portion. [1] The piping body is passed through a metal casing. [2] Attach a nipple and cylindrical socket to the end of the piping body. [3] Pass the nipple and cylindrical socket through the opening in the bottom plate of the jig, and screw the cylindrical portion of the jig onto the end of the metal casing. [4] Attach a rotating adapter to the end of the nipple opposite the end connected to the pipe body. By going through these steps, the heat-resistant piping protection member of the present invention can be easily assembled to the piping body.

[0027] In addition, by making the maximum outer diameter of the rotating adapter larger than the inner diameter of the opening of the bottom plate of the jig, when the jig tries to move to the opposite side (the rotating adapter side) from the metal casing, the rotating adapter comes into contact with and gets caught on the bottom plate of the jig, which prevents the jig from falling off the piping body.

[0028] In the heat-resistant pipe in which the heat-resistant pipe protective member of the present invention is attached to the pipe body, On the outer surface of the pipe body, An inner layer made of aluminum; An intermediate layer made of carbon cloth; and Aluminum outer layer A heat-resistant coating is provided, It is also preferable that the end section of the heat-resistant coating is placed over the outer circumferential surface of the cylindrical socket and fixed by crimping the annular stopper.

[0029] Here, the term "heat-resistant coating" means a heat-resistant coating including at least the above three layers (inner layer, outer layer, and intermediate layer), and also includes the concept of adding another layer to make four or more layers. This heat-resistant coating not only reinforces the pipe body, but also increases its heat resistance. Specifically, the carbon cloth used in the intermediate layer is not only excellent in heat resistance, flame retardancy, and flame resistance, but is also lightweight, flexible, and tough. In addition, the aluminum used in the inner and outer layers easily reflects radiant heat, and can protect the pipe body from heat.

[0030] In addition, the heat-resistant coating can be firmly fixed to the piping body by covering the end section of the heat-resistant coating with the outer circumferential surface of the cylindrical socket and crimping the annular stopper. In this case, the annular stopper is crimped and plastically deformed, so that it is necessary to replace it with a new one when replacing the piping body. However, since the annular stopper is a small and inexpensive part, it is more economical than replacing the entire metal casing. Effect of the Invention

[0031] As described above, the present invention makes it possible to easily attach and detach the metal casing in a heat-resistant piping protective member that can cover the periphery of the piping body with a flexible metal casing. [Brief description of the drawings]

[0032] [Figure 1] 2 is a cross-sectional view showing a heat-resistant pipe cut along a plane including its center line. FIG. [Diagram 2] 13 is a cross-sectional view showing a metal casing and a jig in a heat-resistant pipe according to another embodiment, cut along a plane including the center line. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The heat-resistant hose (heat-resistant pipe) using the heat-resistant pipe protective member of the present invention will be described in more detail with reference to the drawings. However, the contents described below are merely preferred embodiments, and the technical scope of the heat-resistant pipe protective member of the present invention is not limited to the configuration described below. The heat-resistant pipe protective member of the present invention can be appropriately modified within the scope of the invention.

[0034] 1. Overview of heat-resistant hoses (heat-resistant piping) Fig. 1 is a cross-sectional view showing a heat-resistant hose (heat-resistant piping) cut along a plane including a center line L. As shown in Fig. 1, the heat-resistant hose (heat-resistant piping) of this embodiment is configured by combining a hose body (piping body) 10, a heat-resistant coating 20, and a protective member for heat-resistant piping (a metal casing 30, a jig 40, a nipple 50, a rotating adapter 60, a cylindrical socket 70, and an annular stopper 80). This heat-resistant hose (heat-resistant piping) can be suitably used in high-temperature environments such as inside or near a furnace installed in a steelworks.

[0035] Hereinafter, each of the components constituting the heat-resistant hose (heat-resistant piping) of this embodiment will be described in detail.

[0036] 2. Hose body (piping body) The hose body (piping body) 10 is for allowing a fluid (gas or liquid) to flow therethrough. This hose body (piping body) 10 is formed from flexible rubber, resin, or the like. In the heat-resistant hose (heat-resistant piping) of this embodiment, a pressure-resistant hose (a hose whose pressure resistance has been increased by embedding a reinforcing layer in a molding material such as rubber. A pressure-resistant hose is manufactured, for example, by wrapping reinforcing threads in a net shape around the outer periphery of a rubber hose and covering the outside with rubber) is used as the hose body (piping body).

[0037] 3.Heat-resistant coating The heat-resistant coating 20 is provided so as to cover the outer periphery of the hose body (piping body) 10. This makes it possible to protect the hose body (piping body) 10 from heat. The heat-resistant coating 20 has a three-layer structure consisting of an inner layer 21 made of aluminum, an intermediate layer 22 made of carbon cloth, and an outer layer 23 made of aluminum. Of these, the carbon cloth used for the intermediate layer 22 is not only excellent in heat resistance, flame retardancy, and flame resistance, but is also lightweight, flexible, and tough. The aluminum used for the inner layer 21 and the outer layer 23 has the function of reflecting radiant heat.

[0038] In the heat-resistant hose (heat-resistant piping) of this embodiment, aluminum foil is wrapped around the outer peripheral surface of the hose body (piping body) 10 to form the inner layer 21, then carbon cloth is wrapped around the outer peripheral surface of the inner layer 21 to form the intermediate layer 22, and finally aluminum cloth is wrapped around the outer peripheral surface of the intermediate layer 22 to form the outer layer 23. Most of the heat-resistant coating 20 is in contact with the outer peripheral surface of the hose body (piping body) 10, but its end sections are hung on the outer surface of a cylindrical socket 70, which will be described later.

[0039] The thickness of the inner layer 21 (thickness of the aluminum foil) is not particularly limited, but is usually about 0.01 to 0.5 mm, and preferably in the range of 0.02 to 0.2 mm. The thickness of the intermediate layer 22 (thickness of the carbon cloth) is also not particularly limited, but is usually about 0.5 to 3 mm, and preferably in the range of 1 to 2 mm. Furthermore, the thickness of the outer layer 23 (thickness of the aluminum cloth) is also not particularly limited, but is usually about 0.01 to 0.5 mm, and preferably in the range of 0.02 to 0.2 mm.

[0040] 4. Metal casing (protective material for heat-resistant piping) The metal casing 30 is a tube-shaped member arranged to cover the outer periphery of the hose body (piping body) 10. This metal casing 30 has a function of protecting the hose body (piping body) 10 from impacts of flying objects (red-hot coke in a coke oven, etc.). In the heat-resistant piping protective member of the present invention, an interlock tube is used as the metal casing 30. The interlock tube has excellent impact resistance while also having flexibility to a degree that allows it to follow the hose body (piping body) 10. There are various types of interlock tubes, such as semi-interlock tubes and casing tubes, and in the heat-resistant hose (heat-resistant piping) of this embodiment, a semi-interlock tube is used as the metal casing 30.

[0041] Interlock tubes, including semi-interlock tubes, are formed by spirally winding a metal strip member 31 and interlocking overlapping portions of the strip member 31. The material of the metal casing 30 (the material of the strip member 31) is not particularly limited as long as it is a metal, but stainless steel (SUS) is usually used.

[0042] In the metal casing 30 (semi-interlock tube) of the heat-resistant hose (heat-resistant piping) of this embodiment, one side edge is folded back on the outer side to form a U-shaped cross section, and the other side edge is folded back on the inner side to form a U-shaped cross section (bent into an S-shaped cross section as a whole) is used as the belt-shaped member 31, and in the process of winding the belt-shaped member 31 in a spiral shape, a folded-back portion of the belt-shaped member 31 in one winding row is interlocked with a folded-back portion of the belt-shaped member 31 in the adjacent winding row. In the semi-interlock tube, the belt-shaped members 31 are tightly interlocked with each other, and the tube has excellent durability. In addition, the tube is not easily stretched or contracted in the longitudinal direction.

[0043] As described above, the metal casing 30 made of an interlock tube such as a semi-interlock tube is formed by winding the strip-shaped member 31 in a spiral shape, and therefore has a spiral irregularity 32 formed on its outer periphery. This spiral irregularity 32 can be used as a screw groove (in the case of a concave portion) or a screw thread (in the case of a convex portion). However, if the dimensions (pitch, etc.) or shape of the irregularity 32 change, it becomes difficult to use the irregularity 32 as a screw groove or a screw thread. However, by using a semi-interlock tube as the metal casing 30 as described above, the dimensions and shape of the irregularity 32 can be stabilized.

[0044] The pitch of the spiral irregularities 32 (the pitch between adjacent concaves or between adjacent convexities) is not particularly limited. However, if the pitch of the irregularities 32 is too narrow, the number of turns of the belt-shaped member 31 may become too large, which may make such processing difficult. For this reason, the pitch of the irregularities 32 is usually set to 2 mm or more, and preferably set to 5 mm or more. On the other hand, if the pitch of the irregularities 32 is too wide, the number of turns of the belt-shaped member 31 may become too small, which may reduce the flexibility of the metal casing 30. For this reason, the pitch of the irregularities 32 is usually set to 30 mm or less, preferably set to 20 mm or less, and more preferably set to 10 mm or less.

[0045] The step (depth (when considered as a recess) or height (when considered as a protrusion)) of the spiral irregularity 32 is not particularly limited. However, as described later, the irregularities 42a of the jig cylindrical portion 42 are screwed into the irregularities 32, and if the step of the irregularities 32 is small, it may be difficult to firmly screw the irregularities 32 and the irregularities 42a together. For this reason, the step of the irregularities 32 is usually set to 0.5 mm or more, preferably 1 mm or more, and more preferably 1.5 mm or more. On the other hand, if the step of the unevenness 32 is made large, adjacent convex portions of the unevenness 32 may butt against each other when attempting to bend the metal casing 30, making it difficult to bend the metal casing 30 as desired. It also becomes necessary to make the diameter of the metal casing 30 significantly larger than the diameter of the hose body 10. For this reason, the step of the unevenness 32 is usually set to 10 mm or less, preferably 5 mm or less, and more preferably 3 mm or less.

[0046] 5. Jig (protective material for heat-resistant piping) The jig 40 is a member attached to the end of the metal casing 30 in order to regulate the movement of the metal casing 30 relative to the hose body (piping body) 10. The jig 40 is usually made of metal. The jig 40 can be made of stainless steel (SUS) like the metal casing 30, but considering the cost, etc., SS material (general structural rolled steel) such as SS400, SC material (carbon steel) such as S45C, iron, etc. can be preferably used. This jig 40 is a cap-shaped member composed of a jig bottom plate part 41 and a jig tubular part 42 rising from the peripheral part of the jig bottom plate part 41. An opening 41a is provided in the center of the jig bottom plate part 41. Meanwhile, a screw-in unevenness 42a is provided in a spiral shape on the inner peripheral part of the jig tubular part 42. This screw-in unevenness 42a is structured to be screwed into the spiral unevenness 32 formed on the outer peripheral part of the metal casing 30. Therefore, the recesses and protrusions 42 a for screwing are set to a size and shape that allows them to be screwed into the recesses and protrusions 32 of the metal casing 30 .

[0047] By adopting a structure in which the helical irregularities 42a of the jig tubular portion 42 are screwed into the irregularities 32 of the metal casing 30, the jig 40 can be firmly fixed to the metal casing 30 without tightening the jig tubular portion 42. In addition, the jig 40 can be easily attached to and detached from the metal casing 30 without using tools or the like. Furthermore, when attaching and detaching the jig 40, there is no need to destroy the metal casing 30 or the jig 40. In addition, the metal casing 30 and the jig 40 are hardly plastically deformed at that time. Therefore, the metal casing 30 after the jig 40 is removed and the removed jig 40 can be used as they are. Therefore, the hose body (piping body) 10 can be replaced economically.

[0048] The inner diameter of the opening 41a of the jig bottom plate portion 41 is set to be smaller than the outer diameter of the metal casing 30. Therefore, when the jig cylindrical portion 42 is screwed into the metal casing 30, the jig bottom plate portion 41 eventually hits an end of the metal casing 30, where the jig cylindrical portion 42 is positioned, and the jig 40 is integrated with the metal casing 30.

[0049] In addition, the inner diameter of the opening 41a of the jig bottom plate portion 41 is set smaller than the outer diameter of an annular stopper 80 (this annular stopper 80 is immovably fixed to the end of the hose body (piping body) 10) described below. Therefore, even if the metal casing 30 attempts to move rightward relative to the hose body (piping body) 10 in the direction of the paper surface of FIG. 1, the jig bottom plate portion 41 will abut against the annular stopper 80, and the metal casing 30 will stop at that position.

[0050] Furthermore, the inner diameter of the opening 41a of the jig bottom plate portion 41 is set smaller than the maximum outer diameter of an adapter fixing portion 61 constituting a rotating adapter 60 described below. Therefore, even if the metal casing 30 attempts to move leftward relative to the hose body (piping body) 10 in the direction of the paper in Fig. 1, the jig bottom plate portion 41 will abut against the adapter fixing portion 61, and the metal casing 30 will stop at that position.

[0051] In this manner, in the heat-resistant hose (heat-resistant piping) of this embodiment, the jig bottom plate portion 41 of the jig 40 abuts against the annular stopper 80 or the adapter fixing portion 61 (rotating adapter 60), thereby restricting the movement of the metal casing 30 relative to the hose main body (piping main body) 10 in the direction along the center line L of the heat-resistant hose (heat-resistant piping).

[0052] In addition, the inner diameter of the opening 41a of the jig bottom plate portion 41 is set to be slightly larger than the maximum outer diameter of the cylindrical socket 70, the nipple 50, and the adapter fixing portion 61, which will be described later. Therefore, when the metal casing 30 tries to move in a direction perpendicular to the center line L of the heat-resistant hose (piping body) (in the radial direction of the hose body (piping body) 10), the inner peripheral surface of the opening 41a abuts against the outer peripheral surfaces of the cylindrical socket 70, etc. This also restricts the positions of the jig 40 and the metal casing 30 in the radial direction of the hose body (piping body) 10.

[0053] A predetermined gap (air layer α) is formed between the inner peripheral surface of the metal casing 30 and the outer peripheral surface of the hose body (piping body) 10, and this air layer α can be securely secured by regulating the position of the metal casing 30 in the radial direction of the hose body (piping body) 10. Since the air layer α functions as a heat insulating layer, securing the air layer α can make the hose body (piping body) 10 less susceptible to damage caused by heat.

[0054] Furthermore, the air layer α also functions as an impact absorbing layer, so that even if flying debris collides with the outer peripheral surface of the metal casing 30, the presence of the air layer α can prevent that part of the metal casing 30 from hitting the outer peripheral surface of the hose body 10 (strictly speaking, the outer peripheral surface of the heat-resistant coating 20). This makes it possible to make the hose body (piping body) 10 less susceptible to damage due to impact. In addition, the presence of the air layer α has the advantage of increasing the degree of freedom in bending the metal casing 30, making the heat-resistant hose easier to handle.

[0055] As such, the air layer α has various advantages, and by centering the hose body (piping body) 10 relative to the metal casing 30 using the jig 40, the air layer α becomes more likely to be properly formed between the inner surface of the metal casing 30 and the outer surface of the hose body (piping body) 10.

[0056] 5.Nipples (protective parts for heat-resistant piping) The nipple 50 is attached in a press-fitted state to the end of the hose body (piping body) 10. This nipple 50 is usually made of metal. Like the metal casing 30, the nipple 50 can also be made of stainless steel (SUS). However, like the jig 40, SS materials (general structural rolled steel materials) such as SS400, SC materials (carbon steel materials) such as S45C, iron, etc. can be preferably used in consideration of costs, etc. By press-fitting the nipple 50 into the hose body (piping body) 10, it is possible to circulate the fluid between the hose body (piping body) 10 and equipment such as a pump or a nozzle without leakage. The nipple 50 can be a commercially available product that is known in the art.

[0057] 6. Rotating adapter (protective material for heat-resistant piping) The rotating adapter 60 is a member that allows the heat-resistant hose (heat-resistant piping) to rotate around the center line L. This rotating adapter 60 is also usually made of metal (the same metal as the jig 40 and the nipple 50). The rotating adapter 60 includes an adapter fixing part 61 that is fixed in an immovable state relative to the above-mentioned device (pump, nozzle, etc.) that is connected to the hose main body (piping main body) 10, and an adapter rotating part 62 that is rotatably connected to the adapter fixing part 61. The adapter rotating part 62 is fixed in an immovable state relative to the nipple 50. By providing this rotating adapter 60, the degree of freedom in handling the heat-resistant hose (heat-resistant piping) can be increased.

[0058] 7. Cylindrical socket (protective component for heat-resistant piping) The cylindrical socket 70 is for holding the hose body (piping body) 10 against the nipple 50 so that the nipple 50 does not come off from the hose body (piping body) 10. This cylindrical socket 70 is also usually made of metal (the same metal as the jig 40 and the nipple 50). The cylindrical socket 70 is fitted over both the hose body (piping body) 10 and the nipple 50, and is crimped to the outer periphery of the hose body (piping body) 10 and the nipple 50. In the heat-resistant hose (heat-resistant piping) of this embodiment, the cylindrical socket 70 is crimped on all sides. As a result, the end of the hose body (piping body) 10 is firmly clamped between the inner periphery of the cylindrical socket 70 and the outer periphery of the nipple 50.

[0059] 8. Annular stopper (protective material for heat-resistant piping) The annular stopper 80 is fixed to the outer peripheral surface of the cylindrical socket 70. This annular stopper 80 has a function of restricting the movement of the metal casing 30 (movement to the right side when facing the paper surface of FIG. 1) by abutting against the jig bottom plate portion 41, and a function of restricting the movement of the metal casing 30 (radial movement of the hose main body (piping main body) 10) by abutting against the inner peripheral surface of the metal casing 30. For this reason, the outer diameter of the annular stopper 80 is set to be approximately the same as the inner diameter of the metal casing 30. This annular stopper 80 is also usually made of metal (the same metal as the jig 40 and the nipple 50).

[0060] As already described, in the heat-resistant hose (heat-resistant piping) of this embodiment, a configuration is adopted in which the cylindrical socket 70 is crimped, and by crimping this annular stopper 80 to the cylindrical socket 70, not only is the annular stopper 80 fixed to the cylindrical socket 70, but at that time, the cylindrical socket 70 is also crimped to the hose body (piping body) 10 (strictly speaking, the nipple 50 inside it). In addition, the end section of the heat-resistant coating 20 is also hung on the outer circumferential surface of the cylindrical socket 70, and the annular stopper 80 also has the function of keeping the end section of the heat-resistant coating 20 firmly clamped between its inner circumferential surface and the outer circumferential surface of the cylindrical socket 70.

[0061] 7.How to use The heat-resistant hose (heat-resistant piping) of the present embodiment described above can be assembled, for example, in the following manner. [Step 1] A heat-resistant coating 20 is provided on the outer periphery of a hose body (piping body) 10. [Step 2] The hose body (piping body) 10 is passed through the inside of the metal casing 30. [Step 3] The nipple 50 and the cylindrical socket 70 are attached to the end of the hose body (piping body) 10. At this time, the end section of the heat-resistant coating 20 is hung on the outer circumferential surface of the cylindrical socket 70. [Step 4] The nipple 50 and the cylindrical socket 70 are passed through the opening 41 a of the jig bottom plate portion 41 , and the jig cylindrical portion 42 is screwed onto the end of the metal casing 30 . [Step 5] Attach the rotating adapter 60 to the end of the nipple 50 opposite the end connected to the hose body (piping body) 10.

[0062] Furthermore, when replacing the hose body (piping body) 10, the hose body (piping body) 10 can be removed, for example, in the following procedure. [Step 1] Remove the rotating adapter 60 from the nipple 50. [Step 2] Turn the jig 40 relative to the metal casing 30 to unscrew it, and then pull the jig 40 out from the opposite side to the hose body 10 to remove it. [Step 3] Remove the nipple 50 from the hose body (piping body) 10. [Step 4] The hose body (piping body) 10 is pulled out from inside the metal casing 30.

[0063] In this way, in the heat-resistant hose (heat-resistant piping) of this embodiment, the jig 40 is of a screw-type, so that the metal casing 30 can be attached to and detached from the hose body (piping body) 10 in a simple procedure. In addition, since the metal casing 30 is not subjected to plastic deformation such as crimping, the metal casing 30 can be used repeatedly.

[0064] 8.Other In the above, as shown in Fig. 1, the screwing unevenness 42a provided on the inner peripheral portion of the jig tubular portion 42 is screwed into the spiral unevenness 32 provided on the outer peripheral portion of the metal casing 30. However, as shown in Fig. 2, the screwing unevenness 42a provided on the outer peripheral portion of the jig tubular portion 42 may be screwed into the spiral unevenness 32 provided on the inner peripheral portion of the metal casing 30. Fig. 2 is a cross-sectional view showing a state in which the metal casing 30 and the jig 40 in a heat-resistant hose (heat-resistant piping) of another embodiment are cut along a plane including the center line L. In this way, when the screwing unevenness 42a is provided on the outer peripheral portion of the jig tubular portion 42, the jig tubular portion 41 is inserted into the inside of the end portion of the metal casing 30, and the screwing unevenness 42a is screwed into the spiral unevenness 32 of the metal casing 30. [Explanation of symbols]

[0065] 10 Hose body (piping body) 20 Heat-resistant coating 21 Inner layer 22 Middle Class 23 Outer layer 30 Metal casing (protective material for heat-resistant piping) 31 Belt-shaped member 32 Spiral irregularities 40 Jig (protective material for heat-resistant piping) 41 Jig bottom plate 41a opening 42 Jig cylindrical part 42a Threaded engagement recess 50 Nipple (protective material for heat-resistant piping) 60 Rotating adapter (protective material for heat-resistant piping) 61 Adapter fixing part 62 Adapter rotating part 70 Cylindrical socket (protective material for heat-resistant piping) 80 Annular stopper (protective material for heat-resistant piping) L Center line of heat resistant hose α Air layer

Claims

1. A flexible metal casing that covers the outer periphery of the piping body; A jig attached to the end of the metal casing to restrict the movement of the metal casing relative to the piping body; A heat-resistant piping protective member comprising: A nipple press-fitted into the end of the piping body; a rotating adapter connected to an end of the nipple opposite to the end press-fitted into the piping body; A cylindrical socket that is crimped to the outer periphery of the pipe body and the nipple while straddling the pipe body and the nipple; A ring-shaped stopper is an annular member fitted onto the cylindrical socket, and when the jig tries to move toward the piping body, the ring-shaped stopper abuts against the bottom plate of the jig to restrict the movement of the jig so that the jig does not penetrate deeper into the piping body. In addition, The metal casing is an interlock tube having a spirally uneven outer or inner periphery formed by winding a metal strip-shaped member in a spiral shape and engaging the overlapping portions of the strip-shaped member, The jig is A jig bottom plate portion having an opening for leading out the piping body or its connection parts from the metal casing; A jig cylindrical portion rising from the peripheral portion of the jig bottom plate portion; Equipped with The inner or outer periphery of the jig tubular portion is provided with a recess or projection for screwing into the spiral recess or projection. It was considered A heat-resistant piping protective member comprising:

2. The maximum outer diameter of the cylindrical socket and the maximum outer diameter of the nipple are set smaller than the inner diameter of the opening in the bottom plate of the jig, The maximum outer diameter of the rotating adapter is set to be larger than the inner diameter of the opening in the bottom plate of the jig. The heat-resistant piping protective member according to claim 1.

3. 3. A heat-resistant piping protective member as claimed in claim 1 or 2, wherein the metal casing is a semi-interlocking tube formed by spirally winding a metal strip-shaped member while engaging the U-shaped folded portion at the side edge of the metal strip-shaped member.

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