Special-shaped heat preservation connector of thermal nodular cast iron pipe

Abstract

The utility model discloses a heating power nodular cast iron pipe special-shaped heat preservation connector which comprises an outer layer protective sleeve, the outer layer protective sleeve is used for wrapping the connector position of an inserting pipe and a bearing pipe, a bearing pipe connecting opening is fixed to one end of the bearing pipe, one end of the inserting pipe is inserted into the bearing pipe connecting opening, the bearing pipe connecting opening is in a bowl shape, and the inserting pipe is connected with the bearing pipe connecting opening. The bearing surface of the inner wall of the pipe bearing connector can abut against the end part of one end of the insertion pipe; the utility model relates to the technical field of pipeline connector equipment, in particular to a special-shaped heat preservation connector of a heating power nodular cast iron pipe, the bearing pipe connector is designed to be in a bowl shape, the bearing face of the inner wall of the bearing pipe connector can abut against one end of the insertion pipe, and the insertion pipe is connected with the bearing pipe connector. The specific shape of the outer-layer protective sleeve can be tightly attached to the connecting position of the bearing pipe connecting opening and the inserting pipe, the outer-layer protective sleeve abuts against the polyurethane foaming agent and the first protective sleeve through all the contact faces, the connecting stability is enhanced, and looseness is prevented.

Description

Technical Field

[0001] This utility model relates to the field of pipe interface equipment technology, specifically to a special-shaped heat-insulating interface for ductile iron pipes. Background Technology

[0002] Steel pipe corrosion is a widespread problem in all sectors of the national economy and national defense, causing enormous losses to the national economy and creating significant difficulties for production and daily life. Steel pipes corrode constantly under natural conditions (atmosphere, natural water bodies, soil) or man-made conditions (acids, alkalis, salts, and other media), resulting in a spontaneous and unnecessary waste. The fundamental reason is that steel pipes are in a thermodynamically unstable state. Under the aforementioned conditions, they must return to their original relatively stable state, forming iron oxides, carbonates, etc., or transforming into soluble ions. This process is the corrosion process of metals. According to statistics, my country's annual steel production is 160 million tons, and more than 60 million tons are lost annually due to corrosion, roughly equivalent to the annual output of Shanghai Baosteel Steel Plant. Corrosion not only wastes steel resources but also shortens the service life of pipes and equipment. The cost of replacing new pipes and equipment far exceeds the price of the metal materials themselves, thus increasing production costs and reducing economic efficiency. The direct and indirect economic losses caused by corrosion are enormous. Corrosion products form scale, which affects heat transfer and medium flow rate, reducing heat transfer efficiency and thus greatly increasing energy consumption. The economic losses caused by corrosion in my country reach 280 billion yuan every year, which is more than the total amount of natural disasters such as windstorms, floods, earthquakes and fires. In particular, steel pipe joints are more susceptible to corrosion.

[0003] Heat shrink sleeves are heat shrinkable anti-corrosion materials designed for corrosion protection of welded joints in buried and overhead steel pipelines and for insulation repair of insulated pipelines. They can also be used for sealing and corrosion protection of pipeline flange connections. They are composed of a radiation-crosslinked polyolefin substrate and a special sealing hot melt adhesive. The special sealing hot melt adhesive forms a good bond with the polyolefin substrate, the steel pipe surface, and the solid epoxy coating. During heating and installation, the substrate shrinks radially while the internal composite adhesive layer melts, tightly covering the repair area. Together with the substrate, they form a robust anti-corrosion layer on the outside of the pipeline, exhibiting excellent wear resistance, corrosion resistance, impact resistance, and good resistance to ultraviolet radiation and photoaging.

[0004] When connecting steel pipes, foaming agent is used at the joint to create a seal, followed by a heat-shrink sleeve. This sealing method is well-suited for straight pipe connections. A search reveals a self-anchoring pipe joint structure, such as one described in publication number CN112797240B, which includes a pipe body with a socket end at one end. The spigot end of the connecting pipe is inserted into this socket end, which is a bowl-shaped protrusion. Its cross-section resembles a gradually widening bowl opening. If heat-shrink sleeves are used for insulation at this location, it is prone to bursting or becoming too thin, resulting in poor insulation. To address this issue, we designed a method using a uniquely shaped electrofusion sleeve to seal and insulate the irregularly shaped joint at the steel pipe connection. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a special-shaped insulation interface for ductile iron pipes. The socket connection is designed in the shape of a bowl, and its inner wall bearing surface can abut against one end of the insertion pipe. The specific shape of the outer protective sleeve can tightly fit the connection between the socket connection and the insertion pipe. Through the mutual abutment of each contact surface with the polyurethane foam and the first protective sleeve, the stability of the connection is enhanced and loosening is prevented.

[0006] A special-shaped thermal insulation interface for ductile iron pipe includes an outer protective sleeve, which is used to wrap the interface between the insert and the socket. One end of the socket is fixed with a socket connection port, and one end of the insert is inserted into the socket connection port. The socket connection port is bowl-shaped, and the inner wall of the socket connection port can abut against one end of the insert.

[0007] It also includes an outer protective sleeve that covers the outside of the pipe connection port, the pipe and the insertion tube.

[0008] Furthermore, it also includes a polyurethane foaming agent, which is sprayed onto the connection between the socket and the insertion tube. The polyurethane foaming agent can cover the connection between the socket and the insertion tube, and can be covered by the outer protective sleeve. The polyurethane foaming agent forms the shape of the socket at the connection between the socket and the insertion tube.

[0009] Furthermore, the outer protective sleeve is a bent shape with a central depression, and it can match the shape of the connection between the socket and the insertion tube.

[0010] Furthermore, the upper parts of both sides of the outer protective sleeve are respectively provided with a first contact surface, the first contact surface being a plane, one side of the recess of the outer protective sleeve being a first inclined surface, the first inclined surface corresponding to the outer arc surface of the pipe connection port, the other side of the recess of the outer protective sleeve corresponding to the first inclined surface being a third contact surface, the third contact surface being a vertical surface perpendicular to the first contact surface, the connection between the third contact surface and the corresponding first contact surface being an arc-shaped surface, the third contact surface being used to abut against the polyurethane foaming agent provided at the outer end of the pipe connection port, the bottom wall of the recess of the outer protective sleeve being a second contact surface, the second contact surface being used to abut against the polyurethane foaming agent covering the lower side of the pipe connection port.

[0011] Furthermore, the outer protective sleeve includes a support layer, a heating wire, and a hot-melt layer. The heating wire is disposed inside the support layer, and the hot-melt layer is fixedly disposed on the upper side of the support layer. The hot-melt layer contacts the polyurethane foaming agent.

[0012] Furthermore, the outer protective sleeve can surround the polyurethane foam outside the connection between the insertion tube and the socket tube to cover it. After the outer protective sleeve is heated by a heating wire, one end of the heat-melting layer is melted and bonded to the other end.

[0013] Furthermore, a first protective sleeve is respectively fitted over the insertion tube and the receiving tube, and the first contact surface of the outer protective sleeve can abut against the first protective sleeve.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are:

[0015] (1) When polyurethane foam is sprayed onto the connection between the socket and the insertion pipe, it can form a sealing layer that conforms to the shape of the socket. The outer protective sleeve further covers the polyurethane foam, and the multi-layer protection effectively prevents leakage and greatly improves the sealing performance of the connection.

[0016] (2) The socket connection is designed in a bowl shape. Its inner wall bearing surface can abut against one end of the insertion tube. The specific shape of the outer protective sleeve can fit tightly against the connection between the socket connection and the insertion tube. Through the mutual abutment of each contact surface with the polyurethane foam and the first protective sleeve, the stability of the connection is enhanced and loosening is prevented.

[0017] (3) The outer protective sleeve is heated by a heating wire, so that the hot melt layer is melted and the two ends are bonded together. The operation is simple and the installation time is shortened. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0020] Figure 2 This is a partial three-dimensional structural schematic diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0022] Figure 4 For the front view of this utility model Figure 1 ;

[0023] Figure 5 For the front view of this utility model Figure 2 ;

[0024] Figure 6 This is a perspective view of Embodiment 2 of the outer protective sleeve of this utility model.

[0025] In the diagram: 1. First protective sleeve; 2. Inserted tube; 3. Socket connection port; 301. Socket surface; 4. Socket; 5. Outer protective sleeve; 501. Heating wire; 502. Hot melt layer; 5021. First contact surface; 5022. First inclined surface; 5023. Second contact surface; 5024. Third contact surface; 5025. Arc-shaped surface; 503. Support layer. Detailed Implementation

[0026] A special-shaped thermal insulation interface for ductile iron pipe includes an outer protective sleeve 5, which is used to wrap the interface between the insert 2 and the socket 4. One end of the socket 4 is fixed with a socket connection port 3, and one end of the insert 2 is inserted into the socket connection port 3. The socket connection port 3 is bowl-shaped, and the inner wall bearing surface 301 of the socket connection port 3 can abut against one end of the insert 2.

[0027] It also includes an outer protective sleeve 5, which covers the outside of the pipe connection port 3, the pipe 4 and the insertion tube 2.

[0028] The outer protective sleeve 5 is an electrofusion sleeve, which is an auxiliary component for connecting pipes. It is used to connect two pipes together by electrofusion after the PE sheet is bent, covered with mesh, and rolled.

[0029] The outer protective sleeve 5 has a thickness of 5-6mm, and the outer protective sleeve 5 has a thickness of 6mm at the position corresponding to the pipe connection port 3.

[0030] It also includes a polyurethane foaming agent, which is sprayed at the connection between the socket 3 and the insertion tube 2. The polyurethane foaming agent can cover the connection between the socket 3 and the insertion tube 2. The polyurethane foaming agent can be covered by the outer protective sleeve 5. The polyurethane foaming agent forms the shape of the socket 3 at the connection between the socket 3 and the insertion tube 2.

[0031] The outer protective sleeve 5 is a bent shape with a central depression, and it can match the shape of the connection between the socket 3 and the insertion tube 2.

[0032] In this embodiment, after the polyurethane foam is sprayed onto the connection between the socket 3 and the insertion tube 2, it wraps around the connection and forms the shape of the socket 3, thereby creating a preliminary sealing structure at the connection. The outer protective sleeve 5 is covered with polyurethane foam, and the contact surfaces of its recesses are tightly fitted with the polyurethane foam, further preventing gas or liquid leakage and achieving a double seal.

[0033] The upper parts of both sides of the outer protective sleeve 5 are respectively provided with a first contact surface 5021, the first contact surface 5021 is a plane, one side of the recess of the outer protective sleeve 5 is a first inclined surface 5022, the first inclined surface 5022 corresponds to the outer arc surface of the pipe connection port 3, the other side of the recess of the outer protective sleeve 5 corresponding to the first inclined surface 5022 is a third contact surface 5024, the third contact surface 5024 is a vertical surface perpendicular to the first contact surface 5021, the connection between the third contact surface 5024 and the corresponding first contact surface 5021 is an arc surface 5025, the third contact surface 5024 is used to abut against the polyurethane foam agent provided at the outer end of the pipe connection port 3, the bottom wall of the recess of the outer protective sleeve 5 is a second contact surface 5023, the second contact surface 5023 is used to abut against the polyurethane foam agent covering the lower side of the pipe connection port 3.

[0034] In this embodiment, the unique bowl-shaped design of the socket 3 makes its fit with the end of the insertion tube 2 more stable. When one end of the insertion tube 2 is inserted into the socket 3, the inner wall bearing surface 301 abuts against the end of the insertion tube 2 in all directions, constraining the insertion tube 2 radially and axially, effectively limiting the movement of the insertion tube 2 at the connection point, and providing basic fixed support for the entire connection structure.

[0035] The outer protective sleeve 5 further enhances the stability of the connection from the outside. The first contact surfaces 5021 on both sides are designed as planes, which closely abut against the first protective sleeve 1 outside the insertion tube 2 and the socket tube 4, forming a constraint on the connection part in the horizontal direction to prevent the insertion tube 2 and the socket tube 4 from undergoing relative horizontal displacement.

[0036] The design of the recessed part of the outer protective sleeve 5 fully conforms to the shape of the pipe connection port 3 and the polyurethane foam. The third contact surface 5024, as a vertical surface perpendicular to the first contact surface 5021, closely abuts against the polyurethane foam at the outer end of the pipe connection port 3, restricting the displacement of the polyurethane foam and the pipe connection port 3 in the vertical direction, and preventing loosening caused by external force pulling. The second contact surface 5023 is located on the bottom wall of the recessed part of the outer protective sleeve 5, and interacts with the polyurethane foam covering the lower side of the pipe connection port 3, providing upward support from the bottom, preventing the pipe connection port 3 and the insertion tube 2 from falling downward under the action of gravity or other external forces.

[0037] In addition, the connection between the third contact surface 5024 and the corresponding first contact surface 5021 adopts an arc-shaped surface 5025 design. This transition design not only makes the outer protective sleeve 5 fit the pipe connection port 3 and the polyurethane foam more smoothly and reduces stress concentration, but also further enhances the contact area and friction between the parts. It works synergistically from multiple angles to greatly improve the stability of the connection.

[0038] The outer protective sleeve 5 includes a support layer 503, a heating wire 501, and a hot melt layer 502. The heating wire 501 is respectively provided at one end of the support layer 503 and on both sides corresponding to the first protective sleeve 1. The hot melt layer 502 is fixedly provided on the upper side of the support layer 503 and contacts the polyurethane foaming agent.

[0039] The hot melt layer 502 is made of a heat-melting polyethylene material, such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE).

[0040] The support layer 503 is made of non-meltable polyethylene, such as cross-linked polyethylene.

[0041] The outer protective sleeve 5 can surround the polyurethane foam around the outside of the insertion tube 2 and the socket 3 to cover it. The outer protective sleeve 5 is heated by the heating wire 501 so that the heat-melting layer 502 at one end of the outer protective sleeve 5 is melted and bonded to the other end.

[0042] The insertion tube 2 and the receiving tube 4 are respectively covered with a first protective sleeve 1, and the first contact surface 5021 of the outer protective sleeve 5 can abut against the first protective sleeve 1.

[0043] In this embodiment, the outer protective sleeve 5 includes a support layer 503, a heating wire 501, and a heat-melting layer 502. When the outer protective sleeve 5 needs to be installed, the heating wire 501 is energized, generating heat that raises the temperature of the heat-melting layer 502 and gradually melts it. At this time, the outer protective sleeve 5 is wrapped around the polyurethane foam outside the insertion tube 2 and the connection port 3 of the socket tube. After the heat-melting layer 502 cools, the two ends of the outer protective sleeve 5 are bonded together, completing the installation.

[0044] In another embodiment, protruding posts 6 are fixed to the outer wall ends of the support layer 503 of the outer protective sleeve 5. When installing the outer protective sleeve 5, the protruding posts 6 at the four corners can be pulled from the support layer 503 of the outer protective sleeve 5. Insulating rubber material, rope or other fixed workpieces can be used for pulling. After pulling, electrothermal melting is performed, and then the sleeve is wrapped, bonded and sealed. Using this method, the sealing effect is better and it is safer.

[0045] The method of using this utility model is as follows: Prepare the insertion tube 2, the socket tube 4, the socket tube connection port 3, the polyurethane foaming agent, the outer protective sleeve 5, and the first protective sleeve 1. Place the first protective sleeve 1 onto the insertion tube 2 and the socket tube 4 respectively. Insert one end of the insertion tube 2 into the socket tube connection port 3, so that the inner wall receiving surface 301 of the socket tube connection port 3 abuts against one end of the insertion tube 2. Spray the polyurethane foaming agent onto the connection between the socket tube connection port 3 and the insertion tube 2, so that it covers the connection and forms the socket tube connection port 3. Shape the outer protective sleeve 5 around the polyurethane foam outside the insertion tube 2 and the socket 3, ensuring that the first contact surface 5021 of the outer protective sleeve 5 abuts against the first protective sleeve 1, and the first inclined surface 5022, the third contact surface 5024 and the second contact surface 5023 of the recess are tightly fitted to the outer arc surface of the socket 3 and the polyurethane foam, respectively. Power is applied to the heating wire 501 to melt the heat-melting layer 502. After cooling, the two ends of the outer protective sleeve 5 are bonded together to complete the installation.

[0046] The above-disclosed embodiments are merely specific examples of this utility model. However, this utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A special-shaped thermal insulation interface for ductile iron pipes, comprising an outer protective sleeve (5), characterized in that: The outer protective sleeve (5) is used to wrap the interface between the insertion tube (2) and the support tube (4). One end of the support tube (4) is fixed with a support tube connection port (3). One end of the insertion tube (2) is inserted into the support tube connection port (3). The support tube connection port (3) is bowl-shaped. The inner wall bearing surface (301) of the support tube connection port (3) can abut against one end of the insertion tube (2). It also includes an outer protective sleeve (5) that covers the outside of the pipe connection port (3), the pipe (4) and the insertion tube (2).

2. The special-shaped insulation joint for ductile iron pipes according to claim 1, characterized in that: It also includes a polyurethane foaming agent, which is sprayed at the connection between the pipe connector (3) and the insert (2). The polyurethane foaming agent can cover the connection between the pipe connector (3) and the insert (2). The polyurethane foaming agent can be covered by the outer protective sleeve (5). The polyurethane foaming agent forms the shape of the pipe connector (3) at the connection between the pipe connector (3) and the insert (2).

3. The special-shaped insulation joint for ductile iron pipes according to claim 2, characterized in that: The outer protective sleeve (5) is a bent shape with a central depression and can match the shape of the connection between the pipe connector (3) and the insertion tube (2).

4. The special-shaped insulation joint for ductile iron pipes according to claim 3, characterized in that: The upper sides of the outer protective sleeve (5) are respectively provided with first contact surfaces (5021), which are planes. One side of the recess of the outer protective sleeve (5) is a first inclined surface (5022), which corresponds to the outer arc surface of the pipe connection port (3). The other side of the recess of the outer protective sleeve (5) corresponding to the first inclined surface (5022) is a third contact surface (5024), which is perpendicular to the outer arc surface of the pipe connection port (3). The first contact surface (5021) is a vertical surface, and the third contact surface (5024) and the corresponding first contact surface (5021) are connected at an arc-shaped surface (5025). The third contact surface (5024) is used to abut against the polyurethane foaming agent provided at the outer end of the pipe connection port (3). The bottom wall of the recess of the outer protective sleeve (5) is a second contact surface (5023). The second contact surface (5023) is used to abut against the polyurethane foaming agent covered on the lower side of the pipe connection port (3).

5. A special-shaped insulation joint for ductile iron pipes according to claim 4, characterized in that: The outer protective sleeve (5) includes a support layer (503), a heating wire (501) and a hot melt layer (502). The heating wire (501) is disposed inside the support layer (503), and the hot melt layer (502) is fixedly disposed on the upper side of the support layer (503). The hot melt layer (502) contacts the polyurethane foaming agent.

6. The special-shaped insulation joint for ductile iron pipes according to claim 5, characterized in that: The outer protective sleeve (5) can surround the outside of the insertion tube (2) and the socket (3) with polyurethane foam to cover it. The outer protective sleeve (5) is heated by heating wire (501) so that the heat-melting layer (502) at one end of the outer protective sleeve (5) is melted and bonded to the other end.

7. A special-shaped insulation joint for ductile iron pipes according to claim 6, characterized in that: The insertion tube (2) and the receiving tube (4) are respectively covered with a first protective sleeve (1), and the first contact surface (5021) of the outer protective sleeve (5) can abut against the first protective sleeve (1).

Images