An anti-sagging insulated prefabricated direct-buried steam insulation pipe

Abstract

The present invention discloses an anti-sagging insulated prefabricated direct-buried steam insulation pipe, comprising an inner insulation layer sleeved on the outside of a working steel pipe, a cylinder sleeved on the outside of the inner insulation layer, an outer insulation layer sleeved on the outside of the cylinder, an outer protective pipe sleeved on the outside of the outer insulation layer, and a support member provided on the working steel pipe for supporting the cylinder. The invention can effectively solve the problems of sagging, easy collapse, and lack of pressure resistance of the soft insulation layer, maintain the basic stability of the overall insulation structure of the soft insulation layer in a high-temperature environment, maintain the thickness of the upper and lower insulation layers of the pipeline basically unchanged, and enable the soft insulation layer to maintain the initial state of construction for a long time. In this insulation structure, an insulating and heat-insulating sliding bracket supports the working steel pipe, keeps the axis of the working pipe and the outer protective pipe in the same straight line, and the sliding bracket can slide axially with the working steel pipe and drive the insulation layer to slide together, thereby ensuring good insulation between the outer protective pipe and the working steel pipe and meeting the insulation requirements of the cathodic protection of the outer protective pipe.

Description

Technical Field

[0001] The present invention belongs to the technical field of directly buried steam pipes, and in particular relates to an anti-sagging insulated prefabricated directly buried steam insulation pipe. Background Art

[0002] In recent years, centralized heating has seen significant growth. This continuous expansion has inevitably led to a continuous increase in the transport distances of directly buried steam pipelines, increasing overall heat losses. Consequently, the thermal insulation performance of these pipelines has become a key indicator of the efficiency of heating network systems. Soft insulation materials such as high-temperature glass wool, aluminum silicate wool, and magnesium silicate wool are commonly used for insulation of directly buried steam pipelines due to their high temperature resistance, relatively low thermal conductivity, light weight, good vibration resistance, low price, and ease of installation.

[0003] In the design of prefabricated direct-buried steam pipe insulation, to ensure the outer sheath surface temperature does not exceed 50°C, the thickness of the prefabricated direct-buried steam pipe insulation layer is relatively thick. However, due to the poor compressive strength of soft insulation layers, the thicker soft insulation layer is prone to sagging under the long-term effects of gravity. This sagging of the soft insulation layer creates an insulation structure that is thin at the top and thick at the bottom, which degrades the insulation performance of the direct-buried steam pipe, increases heat loss, and reduces the economic efficiency of the direct-buried steam pipe system. Therefore, traditional soft insulation structures suffer from rapid degradation of insulation performance and a shortened service life for direct-buried steam pipes. Summary of the Invention

[0004] In response to the above problems, the present invention proposes an anti-sagging insulated prefabricated direct-buried steam insulation pipe, which can effectively solve the problems of sagging, easy collapse and lack of pressure resistance of the soft insulation layer. It can keep the overall insulation structure of the soft insulation layer basically stable in a high temperature environment, and keep the thickness of the upper and lower insulation layers of the pipeline basically unchanged, so that the soft insulation layer can maintain the initial construction state for a long time.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: The present invention provides an anti-sagging insulated prefabricated direct-buried steam insulation pipe, including an inner insulation layer sleeved on the outside of a working steel pipe, a cylinder sleeved on the outside of the inner insulation layer, an outer insulation layer sleeved on the outside of the cylinder, an outer protective pipe sleeved on the outside of the outer insulation layer, and a support member arranged on the working steel pipe for supporting the cylinder.

[0006] Preferably, the support member includes a plurality of support pins and top caps corresponding to the support pins one by one, the outer end surface of the top cap abuts against the inner wall of the cylinder, the inner end of the support pin is connected to the working steel pipe, and the outer end of the support pin passes through the inner insulation layer and is connected to the top cap.

[0007] Preferably, a plurality of the support pins are arranged radially along the working steel pipe.

[0008] Preferably, a nut is connected to the inner side of the top cap, a thread is provided on the outer side wall of the outer end of the support pin, and the outer end of the support pin is screwed and fixed to the nut.

[0009] Preferably, the inner end of the support pin is connected to a reinforcing rod that is arranged in contact with the outer side wall of the working steel pipe, and the reinforcing rod is welded and fixed to the working steel pipe.

[0010] Preferably, a gap is left between the outer insulation layer and the outer protective tube, and at least one sliding support is provided in the outer protective tube, and the sliding support is connected to the outer side wall of the working steel tube. The sliding support is used to support the outer protective tube and the working steel tube to maintain a coaxial arrangement, and at the same time support the working steel tube to slide in the outer protective tube.

[0011] Preferably, at least two of the cylinders are sleeved on the outside of the inner insulation layer, and the sliding support is arranged between two adjacent cylinders. The sliding support includes a tubular thrust transmission component with an outer diameter equal to the outer diameter of the cylinder. The left end of the thrust transmission component is overlapped and fixed with the left cylinder, and the right end of the thrust transmission component is overlapped and fixed with the right cylinder. The left end of the thrust transmission component is provided with a reducer, and the reducer is sleeved on the outside of the working steel pipe. The inner diameter of the small end of the reducer is equal to the outer diameter of the working steel pipe, and the small end of the reducer is connected to the working steel pipe. The inner diameter of the large end of the reducer is equal to the outer diameter of the thrust transmission component, and the large end of the reducer is connected to the thrust transmission component.

[0012] Preferably, a clamp is provided on the outer side of the right end of the thrust transmission component, the upper and lower sides of the clamp are connected to a top plate, the outer side of the top plate is connected to a bottom plate, the width of the ear plates on both sides of the clamp is consistent with the height of the top plate, the outer end of the ear plate is connected to the bottom plate, and the outer end surface of the bottom plate abuts against the inner wall of the outer protective tube.

[0013] Preferably, two spaced-apart blocking rings are sleeved on the outer side of the right end of the thrust transmission member, the blocking rings are fixedly connected to the thrust transmission member, and the clamp is arranged between the two blocking rings.

[0014] Preferably, an insulating pad is provided between the thrust transfer member and the clamp.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides an anti-sagging insulated prefabricated direct-buried steam insulation pipe. In this insulation structure, a support is provided to rigidly support the cylinder, so that the cylinder can bear the weight of the lower inner insulation layer of the pipe, and the upper inner insulation layer of the pipe only bears its own weight, which can greatly reduce the gravity acting on the upper inner insulation layer. When the soft insulation layer in the cylinder is deformed by gravity under a high-temperature environment, it can obtain stable support from the cylinder, effectively preventing it from sagging and deformation, and avoiding the inner insulation layer in the upper part of the pipe from becoming thinner after deformation due to gravity, and can keep the thickness of the upper and lower inner insulation layers of the pipe basically unchanged. This insulation structure can make full use of the advantages of the soft insulation layer, effectively circumvent its disadvantages of being non-compressive and easy to deform, keep the insulation layer structure basically stable, avoid the decline in the insulation performance of the soft insulation layer, extend the service life of the soft insulation layer, reduce heat loss, save energy and reduce emissions, and improve the economic benefits of the direct-buried steam pipe network.

[0017] 2. The present invention provides an anti-sagging insulated prefabricated direct-buried steam insulation pipe. In the insulation structure, an insulating and heat-insulating sliding bracket is provided. When the working steel pipe expands due to heat, the sliding bracket can slide axially with the working steel pipe and drive the insulation layer to slide together, so that the working steel pipe can be well supported in the outer protective pipe, and good insulation between the outer protective pipe and the working steel pipe can be ensured, so that the outer protective pipe meets the insulation requirements of cathodic protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the technical description of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative labor, other anti-sagging insulated prefabricated direct-buried steam insulation pipes can also be obtained based on these drawings.

[0019] Figure 1 1 is a schematic diagram of a vertical cross-section of a prefabricated direct-buried steam insulation pipe with an anti-sagging insulation provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the axial cross-sectional structure of an anti-sagging insulated prefabricated direct-buried steam insulation pipe provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a top cap of an anti-sagging insulated prefabricated direct-buried steam insulation pipe provided in an embodiment of the present invention;

[0022] Figure 4 This is a front structural schematic diagram of a support pin for an anti-sagging insulated prefabricated direct-buried steam insulation pipe provided in an embodiment of the present invention;

[0023] Figure 5Schematic diagram of the vertical cross-section structure of an anti-sagging insulated prefabricated direct-buried steam insulation pipe provided in an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 A in the middle is an enlarged structural diagram;

[0025] Figure 7 yes Figure 5 Schematic diagram of the axial cross-section structure at AB in the middle;

[0026] Figure 8 It is a structural schematic diagram of the sagging soft insulation layer in the traditional insulation structure.

[0027] In the figure: 1. Working steel pipe; 2. Inner insulation layer; 3. Cylinder; 4. Outer insulation layer; 5. Outer protective pipe; 6. Support member; 7. Sliding support; 601. Support pin; 602. Top cap; 603. Nut; 604. Reinforcement rod; 701. Thrust transmission member; 702. Reducer; 703. Hoop; 704. Top plate; 705. Bottom plate; 706. Blocking ring; 707. Insulation pad; 708. Ear plate; 8. Steam pipe; 9. Soft insulation layer; 10. Outer pipe. DETAILED DESCRIPTION

[0028] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] The specific embodiments are as follows:

[0030] In the prior art, due to the shortcomings of the soft insulation layer being poor in pressure resistance and easy to deform, the thicker soft insulation layer 9 is prone to the following deformation under the long-term action of gravity: Figure 8 The sagging phenomenon shown in the figure. After the soft insulation layer 9 sags, the insulation structure layer becomes thinner at the top and thicker at the bottom, which leads to a decrease in the insulation performance of the steam pipe 8, an increase in heat loss, and a reduction in the economic benefits of the steam pipe system.

[0031] In order to avoid the above phenomenon, this embodiment provides an anti-sagging insulation prefabricated direct-buried steam insulation pipe, such as Figure 1-4 As shown, it includes an inner insulation layer 2 sleeved on the outside of the working steel pipe 1, a cylinder 3 sleeved on the outside of the inner insulation layer 2, an outer insulation layer 4 sleeved on the outside of the cylinder 3, an outer protective tube 5 sleeved on the outside of the outer insulation layer 4, and a support 6 arranged on the working steel pipe 1 for supporting the cylinder 3.

[0032] In this embodiment, the inner insulation layer 2 and the outer insulation layer 4 are both soft insulation layers, and the working steel pipe 1, the cylinder 3, and the outer protective pipe 5 are all coaxially arranged.

[0033] The cylinder 3 may be a perforated galvanized iron cylinder, which is heat-resistant and environmentally friendly. The purpose of the perforated galvanized iron cylinder is to allow water in the inner insulation layer to flow out through the holes when water enters the insulation layer, thus preventing water from accumulating in the inner insulation layer 2.

[0034] The cylinder 3 can be assembled from multiple pieces of galvanized iron sheets, with the longitudinal seams and circumferential seams of the iron sheets overlapped, with the overlap size not less than 50 mm. The longitudinal seams and circumferential seams are fixed with blind rivets to form an integral galvanized iron sheet cylinder.

[0035] The thickness of the cylinder 3 can be 0.6 mm to 1.0 mm.

[0036] Specifically, the support member 6 can stably support the cylinder 3, so that the cylinder 3 is rigidly supported and fixed relative to the working steel pipe 1. At this time, the cylinder 3 can bear the weight of the lower inner insulation layer 2. That is, the upper inner insulation layer 2 only bears its own weight, and the remaining weight is borne by the support member 6, which can greatly reduce the force on the upper inner insulation layer 2. In this way, when the inner insulation layer 2 is deformed by gravity in a high-temperature environment, it can be effectively supported by the cylinder 3 to prevent it from sagging and deformation, and to avoid the inner insulation layer 2 in the upper part of the pipeline from becoming thinner, so that the thickness of the inner insulation layer 2 at all locations can remain basically unchanged.

[0037] In this embodiment, the support member 6 may include a plurality of support pins 601 and a top cap 602 corresponding one to the support pins 601. The outer end surface of the top cap 602 abuts against the inner wall of the cylinder 3. The inner end of the support pin 601 is connected to the working steel pipe 1. The outer end of the support pin 601 passes through the inner insulation layer 2 and is connected to the top cap 602.

[0038] The support pin 601 provides rigid support to the top cap 602 , so that the top cap 602 is fixed relative to the working steel pipe 1 . The top cap 602 provides stable support to the cylinder 3 , thereby fixing the cylinder 3 relative to the working steel pipe 1 .

[0039] Among them, a number of the support pins 601 are arranged radially along the working steel pipe 1. The more the number of the support pins 601, the more stable the cylinder 3. For example, multiple groups of the support pins 601 can be provided on the outside of the working steel pipe 1. The support pins 601 distributed on the same axial section are a group, each group can include eight support pins 601, and in each group, the angle between each two adjacent support pins 601 is 45°. In this way, the support pins 601 can provide good support for the circumference of the cylinder 3. The anti-sagging insulated prefabricated direct-buried steam insulation pipe can be placed flat in any direction, and the inner insulation layer can be well supported.

[0040] In order to facilitate the rapid assembly of the top cap 602 and the support pin 601, in this embodiment, a nut 603 is connected to the inner side of the top cap 602, and the outer wall of the outer end of the support pin 601 is provided with a thread, and the outer end of the support pin 601 is screwed and fixed to the nut 603.

[0041] The top cap 602 can be a 40mm x 40mm square steel plate cut from a 3mm steel plate. The steel plate can be chamfered on all sides to eliminate sharp corners and edges. The nut 603 can be an M6 nut, which can be welded to the center of the square steel plate. The outer wall of the outer end of the support pin 601 is provided with an M6 thread, and the thread length can be 10mm. During installation, the top cap 602 can be directly screwed onto the support pin 601 to secure it.

[0042] The inner end of the support pin 601 is connected to a reinforcing rod 604 that is arranged in contact with the outer wall of the working steel pipe 1 to strengthen the connection stability between the support pin 601 and the working steel pipe 1.

[0043] The reinforcing rod 604 and the supporting pin 601 may be an integrated structure, that is, the inner end of the supporting pin 601 may be bent into an L-shape.

[0044] The reinforcing rod 604 and the working steel pipe 1 can be fixed by welding.

[0045] The support pin 601 can be a φ6 round steel, and its length is equal to the thickness of the inner insulation layer 2.

[0046] In addition, since the axis of the working steel pipe 1 needs to coincide with the axis of the outer protective pipe, the working steel pipe 1 will expand freely under heat and move axially, which may cause the insulation layer to slide axially. Figure 5-7 As shown, a gap is left between the outer insulation layer 4 and the outer protective tube 5 , and at least one sliding support 7 is provided in the outer protective tube 5 , and the sliding support 7 is connected to the outer side wall of the working steel pipe 1 .

[0047] With this arrangement, when the working steel pipe 1 expands and moves axially due to heat, it can drive the insulation layer to slide axially within the outer protective tube 5. To maintain the integrity of the outer insulation layer of the working steel pipe 1, the insulation layer must slide synchronously with the expansion end. In this embodiment, the sliding support 7 is provided on the outer side of the working steel pipe 1 to promote the synchronous sliding of the insulation layer.

[0048] In this embodiment, at least two cylinders 3 are sleeved on the outside of the inner insulation layer 2, and the sliding support 7 is arranged between two adjacent cylinders 3. The sliding support 7 includes a tubular thrust transmission component 701 whose outer diameter is equal to the outer diameter of the cylinder 3. The left end of the thrust transmission component 701 is overlapped and fixed with the left cylinder 3, and the right end of the thrust transmission component 701 is overlapped and fixed with the right cylinder 3. The left end of the thrust transmission component 701 is provided with a reducer 702, and the reducer 702 is sleeved on the outside of the working steel pipe 1. The inner diameter of the small end of the reducer 702 is equal to the outer diameter of the working steel pipe 1, and the small end of the reducer 702 is connected to the working steel pipe 1, the inner diameter of the large end of the reducer 702 is equal to the outer diameter of the thrust transmission component 701, and the large end of the reducer 702 is connected to the thrust transmission component 701.

[0049] Specifically, the reducer 702 and the thrust transmission member 701 are both filled with the inner thermal insulation layer 2. The small end of the reducer 702 is fixedly connected to the outer wall of the working steel pipe 1, and the large end of the reducer 702 is fixedly connected to the thrust transmission member 701. In this arrangement, when the working steel pipe 1 expands axially due to heat, it can drive the reducer 702 and the thrust transmission member 701 to move synchronously, and push the inner thermal insulation layer 2 to slide axially inside the outer protective tube 5.

[0050] The thrust transfer member 701 may be a short steel tube, and its length may be about 1.2 m.

[0051] The thrust transmission member 701 and the reducer 702 may be fixed by welding. The reducer 702 and the working steel pipe 1 may be fixed by welding.

[0052] The large end of the reducer 702 can be wound with high temperature resistant aerogel.

[0053] The thickness of the thrust transfer member 701 may be equal to the thickness of the working steel pipe 1 .

[0054] In order to enable the outer insulation layer 4 to slide synchronously with the working steel pipe 1, in this embodiment, a clamp 703 is provided on the outer side of the right end of the thrust transfer member 701, and the upper and lower sides of the clamp 703 are connected to the top plate 704, and the outer side of the top plate 704 is connected to the bottom plate 705. The width of the ear plates 708 on both sides of the clamp 703 is consistent with the height of the top plate 704, and the outer end of the ear plate 708 is connected to the bottom plate 705, and the outer end surface of the bottom plate 705 is in contact with the inner wall of the outer protective tube 5.

[0055] Specifically, the top plates 704 on the upper and lower sides and the ear plates 708 on the left and right sides together form four supports. When the working steel pipe 1 expands and moves axially, it drives the thrust transmission member 701 to move synchronously, thereby driving the top plates 704 and the ear plates 708 to move synchronously. The top plates 704 and the ear plates 708 can push the outer insulation layer 4 to slide axially inside the outer protective tube 5.

[0056] At the same time, the four supports formed by the top plate 704 and the ear plate 708 can also limit the working steel pipe 1, so that when the working steel pipe 1 expands and moves, it can only move axially along the inner side of the outer protective tube 5, preventing the working steel pipe 1 from deviating from the axis to both sides.

[0057] The clamp 703 may be made of flat steel, may have a width of 100 mm to 200 mm, and an inner diameter that is the outer diameter of the thrust transfer component 701 plus 10 mm.

[0058] The ear plate 708 and the bottom plate 705 may be fixed by welding. The top plate 704 and the bottom plate 705 may also be fixed by welding.

[0059] In order to enhance the stability of the top plate 704 , in this embodiment, two spaced-apart blocking rings 706 are sleeved on the outer side of the right end of the thrust transfer member 701 . The blocking rings 706 are fixedly connected to the thrust transfer member 701 , and the clamp 703 is disposed between the two blocking rings 706 .

[0060] Specifically, the blocking ring 706 limits the clamp 703 , thereby preventing the clamp 703 from being separated from the thrust transmission component 701 .

[0061] The blocking ring 706 and the thrust transfer component 701 may be fixed by welding.

[0062] The blocking ring 706 can be made of round steel, and the diameter of the round steel can be the thickness of the hoop 703 plus 5 mm.

[0063] The net distance between the two blocking rings 706 may be the width of the clamp 703 plus 15 mm.

[0064] An insulating pad 707 is provided between the thrust transmission member 701 and the clamp 703, so that the outer protective tube 5 has good insulation properties to the working steel pipe 1, and the outer protective tube meets the insulation requirements of cathodic protection.

[0065] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-sagging insulated prefabricated direct-buried steam insulation pipe, characterized in that: The invention comprises an inner thermal insulation layer (2) sleeved on the outside of a working steel pipe (1), a cylinder (3) sleeved on the outside of the inner thermal insulation layer (2), an outer thermal insulation layer (4) sleeved on the outside of the cylinder (3), an outer protective tube (5) sleeved on the outside of the outer thermal insulation layer (4), and a support member (6) provided on the working steel pipe (1) for supporting the cylinder (3); The support member (6) includes a plurality of support pins (601) and top caps (602) corresponding to the support pins (601). The outer end surface of the top cap (602) abuts against the inner wall of the cylinder (3). The inner end of the support pin (601) is connected to the working steel pipe (1). The outer end of the support pin (601) passes through the inner insulation layer (2) and is connected to the top cap (602). A gap is left between the outer insulation layer (4) and the outer protective tube (5); at least one sliding support (7) is provided in the outer protective tube (5); the sliding support (7) is connected to the outer side wall of the working steel tube (1); the sliding support (7) is used to support the outer protective tube (5) and the working steel tube (1) to maintain a coaxial arrangement, and at the same time support the working steel tube (1) to slide in the outer protective tube (5); The outer side of the inner thermal insulation layer (2) is provided with at least two cylinders (3) distributed at intervals, the sliding support (7) is provided between two adjacent cylinders (3), the sliding support (7) comprises a tubular thrust transmission member (701) having an outer diameter equal to that of the cylinder (3), the left end of the thrust transmission member (701) is overlapped and fixed with the left cylinder (3), the right end of the thrust transmission member (701) is overlapped and fixed with the right cylinder (3), and the thrust transmission member A reducer (702) is provided on the left side of (701), and the reducer (702) is sleeved on the outside of the working steel pipe (1). The inner diameter of the small end of the reducer (702) is equal to the outer diameter of the working steel pipe (1), and the small end of the reducer (702) is connected to the working steel pipe (1). The inner diameter of the large end of the reducer (702) is equal to the outer diameter of the thrust transmission component (701), and the large end of the reducer (702) is connected to the thrust transmission component (701).

2. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 1 is characterized in that: A plurality of the support pins (601) are arranged radially along the working steel pipe (1).

3. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 1 is characterized in that: The inner side of the top cap (602) is connected with a nut (603), the outer side wall of the outer end of the support pin (601) is provided with a thread, and the outer end of the support pin (601) is screwed and fixed with the nut (603).

4. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 1 is characterized in that: The inner end of the support pin (601) is connected to a reinforcing rod (604) that is arranged in contact with the outer wall of the working steel pipe (1).

5. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 1 is characterized in that: A hoop (703) is sleeved on the outer side of the right end of the thrust transmission component (701); the upper and lower sides of the hoop (703) are connected to a top plate (704); the outer side of the top plate (704) is connected to a bottom plate (705); the width of the ear plates (708) on both sides of the hoop (703) is consistent with the height of the top plate (704); the outer ends of the ear plates (708) are connected to the bottom plate (705); and the outer end surface of the bottom plate (705) abuts against the inner wall of the outer protective tube (5).

6. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 5, characterized in that: Two spaced-apart blocking rings (706) are sleeved on the outer side of the right end of the thrust transmission component (701); the blocking rings (706) are fixedly connected to the thrust transmission component (701); and the hoop (703) is arranged between the two blocking rings (706).

7. The anti-sagging insulated prefabricated direct-buried steam insulation pipe according to claim 6, characterized in that: An insulating heat-insulating pad (707) is provided between the thrust transmission component (701) and the clamp (703).

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