A kind of heat-insulated pipe and its manufacturing method

Abstract

The present application provides an insulated pipeline and a manufacturing method thereof, which belongs to the field of pipeline technology. The insulated pipeline includes a pipe body, a strain detection element, a temperature detection element, a first transmission line and a second transmission line. The pipe body includes an inner pipe and an insulated outer pipe, and the insulated outer pipe is sleeved on the outer side of the inner pipe. The strain detection element is located between the inner pipe and the insulated outer pipe, the strain detection element is attached to the outer wall of the inner pipe, and the strain detection element is configured to detect the strain of the inner pipe. The temperature detection element is located between the inner pipe and the insulated outer pipe, and the temperature detection element is configured to detect the temperature of the inner pipe. The first transmission line is electrically connected to the strain detection element. The second transmission line is electrically connected to the temperature detection element. After the insulated pipeline with strain and temperature detection functions is laid and installed, the first transmission line and the second transmission line can be electrically connected to the test instrument to test the change of the pipeline strain with temperature during operation, provide more engineering example data for pipeline network design, and improve the pipeline network design regulations.

Description

Technical Field

[0001] The present application relates to the field of pipeline technology, and in particular to an insulated pipeline and a manufacturing method thereof. Background Art

[0002] Insulated pipes are often used in heating systems. The flowing medium with heat flows in the insulated pipes to achieve heat transfer and achieve the purpose of heating. In heating systems, insulated pipes need to meet stability requirements, and the stability of insulated pipes often depends on the strain of the insulated pipes after heating. At present, it is impossible to obtain the change of the strain of the insulated pipes in operation with temperature, and it is impossible to provide more engineering data for pipe network design. Summary of the invention

[0003] The embodiments of the present application provide an insulated pipe and a method for manufacturing the same, so as to improve the problem that it is impossible to obtain the variation of the strain of the insulated pipe with the temperature during operation.

[0004] In a first aspect, an embodiment of the present application provides an insulated pipeline, including a pipe body, a strain detection element, a temperature detection element, a first transmission line, and a second transmission line;

[0005] The pipe body comprises an inner pipe and an insulating outer pipe, wherein the insulating outer pipe is sleeved on the outer side of the inner pipe;

[0006] The strain detection element is located between the inner tube and the heat-insulating outer tube, the strain detection element is attached to the outer surface wall of the inner tube, and the strain detection element is configured to detect the strain amount of the inner tube;

[0007] The temperature detection element is located between the inner tube and the thermally insulated outer tube, and the temperature detection element is configured to detect the temperature of the inner tube;

[0008] The first transmission line is electrically connected to the strain sensing element, and one end of the first transmission line away from the strain sensing element extends to the outside of the pipe body;

[0009] The second transmission line is electrically connected to the temperature detection element, and one end of the second transmission line away from the temperature detection element extends to the outside of the tube body.

[0010] In the above technical scheme, a strain detection element and a temperature detection element are provided between the inner tube and the insulated outer tube. The function of the strain detection element is to detect the strain of the inner tube, and the function of the temperature detection element is to detect the temperature of the inner tube. After the insulated pipeline with strain and temperature detection functions is laid and installed, the first transmission line and the second transmission line can be electrically connected to the test instrument to test the change of the strain of the insulated pipeline in operation with the temperature, so as to provide more engineering example data for the pipeline network design work and further improve the pipeline network design regulations. In addition, since the strain detection element is attached to the outer wall of the inner tube, the strain detection element can detect the strain of the inner tube more accurately; since the strain detection element is located between the inner tube and the insulated outer tube, the insulated outer tube can play a good protective role for the strain detection element; since the temperature detection element is located between the inner tube and the insulated outer tube, the insulated outer tube has insulation capacity, and the temperature detection element will not be disturbed by the external environment, ensuring that the temperature detection element can detect the temperature of the inner tube more accurately.

[0011] In addition, the insulated pipe of the embodiment of the present application also has the following additional technical features:

[0012] In combination with the first aspect, in a first possible implementation manner of the first aspect of the present application, the thermally insulated pipe further includes a first shielding member;

[0013] The first shielding member is connected to the inner tube. The first shielding member and the inner tube jointly define a first accommodating space. The strain detection element is located in the first accommodating space.

[0014] In the above technical solution, the first shielding member can protect the strain sensing element and prevent the strain sensing element from being interfered by external electromagnetic interference.

[0015] In combination with the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect of the present application, the insulated pipe further includes a second shielding member;

[0016] The second shielding member is connected to the inner tube. The second shielding member and the inner tube jointly define a second accommodating space. The temperature detection element is located in the second accommodating space.

[0017] In the above technical solution, the second shielding member can protect the temperature detection element and prevent the temperature detection element from being interfered by external electromagnetic interference.

[0018] In combination with the first aspect, in a third possible implementation manner of the first aspect of the present application, the first transmission line is bent and distributed between the inner tube and the insulating outer tube;

[0019] The second transmission line is bent and distributed between the inner tube and the thermal insulation outer tube.

[0020] In the above technical solution, the first transmission line is bent and distributed between the inner tube and the insulated outer tube. When the inner tube changes in length due to thermal expansion and contraction, the first transmission line has a certain expansion margin to ensure the firmness of the connection between the first transmission line and the strain detection element.

[0021] The second transmission line is bent and distributed between the inner tube and the insulated outer tube. When the inner tube changes in length due to thermal expansion and contraction, the second transmission line has a certain expansion margin to ensure the firmness of the connection between the second transmission line and the strain detection element.

[0022] In combination with the first aspect, in a fourth possible implementation manner of the first aspect of the present application, the thermally insulating outer tube includes an outer protective sleeve and a thermally insulating layer;

[0023] An annular space is formed between the outer protective sleeve and the inner tube, and the heat insulating layer is filled in the annular space.

[0024] In the above technical solution, the heat-insulating outer tube includes an outer protective sleeve and an insulating layer. The insulating layer is filled in the annular space between the outer protective sleeve and the inner tube. The insulating layer plays a role of heat insulation and reduces heat loss. The outer protective sleeve can protect the insulating layer. In the actual manufacturing process, the outer protective sleeve can be firstly placed on the outer side of the inner tube, and then the insulating layer is filled between the inner tube and the outer protective sleeve. The manufacturing process is simple.

[0025] In combination with the first aspect, in a fifth possible implementation manner of the first aspect of the present application, the inner tube is a metal tube, and an outer surface wall of the inner tube is provided with an anti-corrosion layer.

[0026] In the above technical solution, the outer wall of the inner tube is provided with an anti-corrosion layer, which can play an anti-corrosion role and prevent the inner tube from being corroded by oxidation.

[0027] In combination with the first aspect, in a sixth possible implementation manner of the first aspect of the present application, the inner tube is a straight tube of equal diameter or a straight tube of reduced diameter or an elbow tube or a tee tube.

[0028] In the above technical solution, the inner tube can be a tube of various shapes, namely, a straight tube of equal diameter, a straight tube of reduced diameter, an elbow tube or a tee tube.

[0029] In a second aspect, an embodiment of the present application provides a method for manufacturing an insulated pipe, comprising the following steps:

[0030] Fixing the strain sensing element to the inner tube so that the strain sensing element fits the outer wall of the inner tube;

[0031] Connecting the first transmission line to the strain sensing element, and leading one end of the first transmission line away from the strain sensing element to the outside of one end of the inner tube;

[0032] Fixing the temperature detection element to the outer wall of the inner tube;

[0033] Connecting the second transmission line to the strain sensing element, and leading one end of the second transmission line away from the strain sensing element to the outside of one end of the inner tube;

[0034] The heat-insulating outer tube is sleeved on the outer side of the inner tube, so that the strain detection element and the temperature detection element are both located between the inner tube and the heat-insulating outer tube.

[0035] After the insulated pipeline with strain and temperature detection functions manufactured by the above method is laid and installed, the first transmission line and the second transmission line can be electrically connected to the test instrument to test the change of pipeline strain with temperature during operation, provide more engineering example data for pipeline network design work, and further improve the pipeline network design regulations.

[0036] In combination with the second aspect, in a first possible implementation manner of the second aspect of the present application, the step of fixing the strain sensing element to the inner tube includes:

[0037] Grinding the outer wall of the inner tube to form a smooth surface;

[0038] Bond the strain sensing element to a smooth surface.

[0039] In the above technical solution, before fixing the strain detection element, the outer wall of the inner tube is first polished to form a smooth surface, so that the strain detection element is bonded to the smooth surface with better firmness.

[0040] In combination with the second aspect, in a second possible implementation manner of the second aspect of the present application, the thermally insulating outer tube includes an outer protective sleeve and a thermally insulating layer;

[0041] The step of sleeve the heat-insulating outer tube on the outer side of the inner tube comprises:

[0042] The outer protective sleeve is placed on the outer side of the inner tube so that an annular space is formed between the outer protective sleeve and the inner tube;

[0043] Fill the annular space with insulation.

[0044] In the above technical solution, the outer protective sleeve is firstly placed on the outer side of the inner tube, and then the insulation layer is filled between the inner tube and the outer protective sleeve, and the manufacturing process is simple. The insulation layer plays a role of heat insulation to reduce heat loss, and the outer protective sleeve can protect the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic diagram of a first possible structure of an insulated pipeline without an insulating outer pipe provided in an embodiment of the present application;

[0047] Figure 2 A cross-sectional view of an insulated pipe provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of the connection between the strain gauge provided in an embodiment of the present application and the inner tube of the first structural form;

[0049] Figure 4 A schematic diagram of the connection between the strain gauge provided in an embodiment of the present application and the inner tube of the second structural form;

[0050] Figure 5 A schematic diagram of the connection between the strain gauge provided in the embodiment of the present application and the inner tube of the third structural form;

[0051] Figure 6 A schematic diagram of the connection between the strain gauge provided in an embodiment of the present application and an inner tube of a fourth structural form;

[0052] Figure 7 A schematic diagram of a second possible structure of an insulated pipeline with the insulating outer pipe removed provided in an embodiment of the present application.

[0053] Icon: 100 - insulated pipe; 10 - pipe body; 11 - inner pipe; 12 - insulated outer pipe; 121 - outer protective sleeve; 122 - insulation layer; 20 - strain detection element; 21 - strain gauge; 30 - temperature detection element; 40 - first transmission line; 50 - second transmission line; 60 - first shielding member; 70 - second shielding member. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0059] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] Example

[0061] like Figure 1 , Figure 2As shown, the embodiment of the present application provides an insulated pipe 100, including a pipe body 10, a strain detection element 20, a temperature detection element 30, a first transmission line 40 and a second transmission line 50. The pipe body 10 includes an inner pipe 11 and an insulated outer pipe 12, and the insulated outer pipe 12 is sleeved on the outer side of the inner pipe 11. The strain detection element 20 is located between the inner pipe 11 and the insulated outer pipe 12, and the strain detection element 20 is attached to the outer wall of the inner pipe 11, and the strain detection element 20 is configured to detect the strain of the inner pipe 11. The temperature detection element 30 is located between the inner pipe 11 and the insulated outer pipe 12, and the temperature detection element 30 is in contact with the outer wall of the inner pipe 11, and the temperature detection element 30 is configured to detect the temperature of the inner pipe 11. The first transmission line 40 is electrically connected to the strain detection element 20, and one end of the first transmission line 40 away from the strain detection element 20 extends to the outside of the pipe body 10. The second transmission line 50 is electrically connected to the temperature detection element 30 , and one end of the second transmission line 50 away from the temperature detection element 30 extends to the outside of the tube body 10 .

[0062] When the insulated pipe 100 is working, the fluid with heat will flow inside the inner pipe 11, and the inner pipe 11 will generate strain after being heated. A strain detection element 20 and a temperature detection element 30 are provided between the inner pipe 11 and the insulated outer pipe 12. The function of the strain detection element 20 is to detect the strain of the inner pipe 11, and the function of the temperature detection element 30 is to detect the temperature of the inner pipe 11. After the insulated pipe 100 with strain and temperature detection functions is laid and installed, the first transmission line 40 and the second transmission line 50 can be electrically connected to the test instrument to test the change of the pipe strain with temperature during operation, so as to provide more engineering example data for the pipe network design work and further improve the pipe network design regulations. In addition, since the strain detection element 20 is attached to the outer wall of the inner tube 11, the strain detection element 20 can detect the strain of the inner tube 11 more accurately; since the strain detection element 20 is located between the inner tube 11 and the insulated outer tube 12, the insulated outer tube 12 can provide good protection for the strain detection element 20; since the temperature detection element 30 is located between the inner tube 11 and the insulated outer tube 12, the temperature detection element 30 will not be disturbed by the external environment, thereby ensuring that the temperature detection element 30 can detect the temperature of the inner tube 11 more accurately.

[0063] The inner tube 11 may be a metal tube, such as a copper tube, an iron tube, an aluminum tube, etc.; the inner tube 11 may also be a non-metallic part, such as a plastic tube, a rubber tube, etc.

[0064] When the inner tube 11 is a metal tube, an anti-corrosion layer may be coated on the outer surface of the inner tube 11 , and the anti-corrosion layer may play an anti-corrosion role to prevent the inner tube 11 from being oxidized and corroded.

[0065] In the actual production process, an anti-corrosion layer can be first applied on the outer wall of the inner tube 11, and then the inner tube 11 is partially polished, and then the strain detection element 20 is set at the polished area, so that the strain detection element 20 fits on the outer wall of the inner tube 11 to ensure the detection accuracy.

[0066] In actual use, the inner tube 11 can be a pipe in various forms, such as a straight tube of equal diameter, a straight tube of reduced diameter, an elbow tube or a tee tube. When the inner tube 11 is a straight tube of equal diameter, the pipe body 10 composed of the inner tube 11 and the insulated outer tube 12 is a straight tube of equal diameter; when the inner tube 11 is a straight tube of reduced diameter, the pipe body 10 composed of the inner tube 11 and the insulated outer tube 12 is a straight tube of reduced diameter; when the inner tube 11 is an elbow tube, the pipe body 10 composed of the inner tube 11 and the insulated outer tube 12 is an elbow tube; when the inner tube 11 is a tee tube, the pipe body 10 composed of the inner tube 11 and the insulated outer tube 12 is an elbow tube. When the pipe body 10 is an elbow tube, the entire insulated pipe 100 is an elbow, which can be used to connect two pipes set at an angle; when the pipe body 10 is a tee tube, the entire insulated pipe 100 is a tee joint, which can be used to connect three pipes.

[0067] The insulating outer tube 12 is located outside the inner tube 11 and has insulation capability, and the insulation performance of the insulating outer tube 12 can reduce the heat loss of the fluid with heat flowing in the inner tube 11. The insulating outer tube 12 can be of various structures as long as it has insulation capability.

[0068] In some embodiments of the present application, Figure 2 As shown, the heat-insulating outer tube 12 includes an outer protective sleeve 121 and a heat-insulating layer 122 . An annular space is formed between the outer protective sleeve 121 and the inner tube 11 , and the heat-insulating layer 122 fills the annular space.

[0069] The heat insulating layer 122 plays a role of heat insulation to reduce heat loss, and the outer protective sleeve 121 can protect the heat insulating layer 122. In the actual manufacturing process, the heat insulating outer tube 12 can be sleeved on the outer side of the inner tube 11, and then the heat insulating layer 122 is filled between the inner tube 11 and the outer protective sleeve 121, and the manufacturing process is simple. Of course, in the actual manufacturing process, the heat insulating layer 122 can also be arranged on the outer side of the inner tube 11, and then the outer protective sleeve 121 can be sleeved on the outer side of the heat insulating layer 122.

[0070] The outer protective cover 121 may be a metal tube, such as a copper tube, an iron tube, an aluminum tube, etc.; the outer protective cover 121 may also be a non-metallic part, such as a plastic tube, a rubber tube, etc. The heat insulating layer 122 may also be made of a variety of materials, such as a single-layer polyurethane heat insulating material, a multi-layer heat insulating material composed of polyurethane and other heat insulating materials.

[0071] Of course, in other specific embodiments, the insulating outer tube 12 may also be other structures, for example, the entire insulating outer tube 12 is made of the same insulating material.

[0072] The strain detection element 20 can be of various structures as long as it can detect the strain amount of the inner tube 11. As an example, the strain detection element 20 is a strain gauge 21, and the strain gauge 21 is attached to the outer wall of the inner tube 11. The first transmission line 40 is connected to the strain gauge 21 to form a strain gauge. When the inner tube 11 is strained, the strain gauge 21 will also deform accordingly, thereby generating a strain detection signal, which is transmitted through the first transmission line 40. Among them, the strain gauge 21 is attached to the outer wall of the inner tube 11 by bonding, that is, a glue layer is applied between the strain detection element 20 and the outer wall of the inner tube 11 to bond the strain gauge 21 to the inner tube 11.

[0073] It should be noted that the specific structure of the strain gauge 21 can be found in the relevant technology and will not be described in detail here.

[0074] The strain detection elements 20 between the inner tube 11 and the insulating outer tube 12 can be one, two or more, and can be set according to specific needs. Of course, the first transmission line 40 corresponds to the strain detection element 20 one by one, that is, one strain detection element 20 is connected to one first transmission line 40.

[0075] In practical applications, the strain sensing element 20 may be arranged in different forms according to different forms of the inner tube 11. Figure 3 As shown, when the inner tube 11 is a straight tube of equal diameter, four strain gauges 21 may be provided on the outer wall of the straight tube of equal diameter, and the four strain gauges 21 are respectively located at four quadrants of the radial cross-section circle of the straight tube of equal diameter; Figure 4 As shown, when the inner tube 11 is a variable diameter straight tube, four strain gauges 21 can be arranged on the outer wall of the variable diameter straight tube, and the four strain gauges 21 are respectively located at four quadrants of the radial cross-section circle of the conical part of the variable diameter straight tube; Figure 5 As shown, when the inner tube 11 is a curved tube, four strain gauges 21 may be provided on the outer wall of the curved tube, and the four strain gauges 21 are respectively located at four quadrants of the radial cross-section circle of the curved portion of the curved tube, wherein two strain gauges 21 are respectively located at the inner side and the outer side of the curved portion of the curved tube; Figure 6 As shown, the three-way pipe includes a main pipe and a sub-pipe connected to the main pipe, the main pipe has two flow openings, and the sub-pipe has one flow opening. When the inner pipe 11 is a three-way pipe, four strain gauges 21 can be arranged on the outer wall of the three-way pipe, wherein three strain gauges 21 are arranged at the connection between the main pipe and the sub-pipe, and another strain gauge 21 is arranged on the side of the outer wall of the main pipe away from the sub-pipe.

[0076] The temperature detection element 30 can also be a variety of structures, as long as it can detect the temperature of the inner tube 11. As an example, the temperature detection element 30 is a temperature sensor, and the temperature sensor is attached to the outer wall of the inner tube 11 to obtain more accurate detection data. The temperature sensor can detect the temperature of the inner tube 11 to obtain a temperature detection signal, and transmit it through the second transmission line 50. Among them, the temperature detection element 30 can be fixed to the outer wall of the inner tube 11 by a connector such as a tape or adhesive tape.

[0077] The first transmission line 40 is a signal transmission line of the strain detection element 20. The first transmission line 40 is electrically connected to the strain detection element 20, that is, the electrical signal generated during the detection process of the strain detection element 20 is transmitted through the first transmission line 40. In actual use, the connection between the first transmission line 40 and the strain detection element 20 can be wrapped with insulating tape and covered with shielding tape.

[0078] Since the inner tube 11 transports a fluid with heat, the inner tube 11 may change in length due to thermal expansion and contraction, which may affect the firmness of the connection between the first transmission line 40 and the strain detection element 20. Therefore, in some embodiments of the present application, the first transmission line 40 may be bent and distributed between the inner tube 11 and the insulation tube. When the inner tube 11 changes in length due to thermal expansion and contraction, the first transmission line 40 has a certain expansion margin to ensure the firmness of the connection between the first transmission line 40 and the strain detection element 20.

[0079] After the first transmission line 40 is bent, the first transmission line 40 can be fixed to the outer wall of the inner tube 11 by using adhesive tape.

[0080] The second transmission line 50 is a signal transmission line of the temperature detection element 30. The second transmission line 50 is electrically connected to the temperature detection element 30, that is, the electrical signal generated during the detection process of the temperature detection element 30 is transmitted through the second transmission line 50. In actual use, the connection between the second transmission line 50 and the strain detection element 20 can also be wrapped with insulating tape and covered with shielding tape.

[0081] Since the inner tube 11 transports a fluid with heat, the inner tube 11 may change in length due to thermal expansion and contraction, which may affect the firmness of the connection between the second transmission line 50 and the temperature detection element 30. Therefore, in some embodiments of the present application, the second transmission line 50 may be bent and distributed between the inner tube 11 and the insulation tube. When the inner tube 11 changes in length due to thermal expansion and contraction, the second transmission line 50 has a certain expansion margin, which ensures the firmness of the connection between the second transmission line 50 and the temperature detection element 30.

[0082] After the second transmission line 50 is bent, the first transmission line 40 can be fixed to the outer wall of the inner tube 11 by using adhesive tape.

[0083] As an electronic device, the strain detection element 20 may be interfered by the outside world during use. Figure 7 As shown, the insulated pipe 100 further includes a first shielding member 60, which is connected to the inner pipe 11. The first shielding member 60 and the inner pipe 11 jointly define a first accommodation space, and the strain detection element 20 is located in the first accommodation space. The first shielding member 60 can protect the strain detection element 20 and prevent the strain detection element 20 from being subjected to external electromagnetic interference.

[0084] The first shielding member 60 can be of various structures as long as it can shield the strain sensing element 20. In a non-limiting example, the first shielding member 60 is a shielding tape, which is bonded to the outer side of the inner tube 11. In actual operation, the strain sensing element 20 can be bonded to the inner tube 11 first, and then the shielding tape can be bonded to the inner tube 11 to cover the strain sensing element 20.

[0085] As an electronic device, the temperature detection element 30 may be interfered by the outside world during use. Figure 7 The heat-insulating pipe 100 further includes a second shielding member 70, which is connected to the inner pipe 11. The second shielding member 70 and the inner pipe 11 jointly define a second accommodation space, and the temperature detection element 30 is located in the second accommodation space. The second shielding member 70 can protect the temperature detection element 30 and prevent the temperature detection element 30 from being subjected to external electromagnetic interference.

[0086] The second shielding member 70 can be of various structures as long as it can shield the temperature detection element 30. In a non-limiting example, the second shielding member 70 is a shielding tape, which is bonded to the outer side of the inner tube 11. In actual operation, the temperature detection element 30 can be bonded to the inner tube 11 first, and then the shielding tape can be bonded to the inner tube 11 to cover the temperature detection element 30.

[0087] In addition, the embodiment of the present application also provides a method for manufacturing an insulated pipe 100, comprising the following steps:

[0088] Fix the strain sensing element 20 to the inner tube 11 so that the strain sensing element 20 fits the outer wall of the inner tube 11;

[0089] Connect the first transmission line 40 to the strain sensing element 20, and lead one end of the first transmission line 40 away from the strain sensing element 20 to the outside of one end of the inner tube 11;

[0090] The temperature detection element 30 is fixed to the outer wall of the inner tube 11;

[0091] Connect the second transmission line 50 to the strain sensing element 20, and lead one end of the second transmission line 50 away from the strain sensing element 20 to the outside of one end of the inner tube 11;

[0092] The heat-insulating outer tube 12 is sleeved on the outer side of the inner tube 11 , so that the strain detection element 20 and the temperature detection element 30 are both located between the inner tube 11 and the heat-insulating outer tube 12 .

[0093] After the insulated pipeline 100 with strain and temperature detection functions manufactured by the above method is laid and installed, the first transmission line 40 and the second transmission line 50 can be electrically connected to the test instrument to test the change of pipeline strain with temperature during operation, so as to provide more engineering example data for pipeline network design work and further improve the pipeline network design procedures.

[0094] It should be noted that, in the above method, the steps of fixing the strain detection element 20 to the inner tube 11; connecting the first transmission line 40 to the strain detection element 20, and leading the end of the first transmission line 40 away from the strain detection element 20 to the outside of the one end of the inner tube 11; fixing the temperature detection element 30 to the outer wall of the inner tube 11; connecting the second transmission line 50 to the strain detection element 20, and leading the end of the second transmission line 50 away from the strain detection element 20 to the outside of the one end of the inner tube 11; these four steps are not limited in order.

[0095] In the above method, the specific structures of the inner tube 11, the insulating outer tube 12, the strain detection element 20 and the temperature detection element 30 can refer to the insulating pipeline 100 provided in any of the above embodiments, and will not be repeated here.

[0096] If the inner tube 11 is a metal pipe, before the strain detection element 20 is fixed to the inner tube 11, the outer wall of the inner tube 11 can be shot blasted and rust-removed, and an anti-corrosion layer can be applied to the outer wall of the inner tube 11; if the inner tube 11 is a non-metallic pipe, before the strain detection element 20 is fixed to the inner tube 11, the outer wall of the inner tube 11 can be cleaned to remove oil, impurities, dust, etc.

[0097] Optionally, the step of fixing the strain detection element 20 to the inner tube 11 includes grinding the outer wall of the inner tube 11 to form a smooth surface on the inner tube 11, and bonding the strain detection element 20 to the smooth surface.

[0098] Before fixing the strain sensing element 20 , the outer wall of the inner tube 11 is first polished to form a smooth surface, so that the strain sensing element 20 is bonded to the smooth surface with better firmness.

[0099] If the inner tube 11 is a metal tube, when the outer surface of the inner tube 11 is polished, taking the strain detection element 20 as a strain gauge 21 as an example, the polishing range is about 3-5 times the area of ​​the strain gauge 21. If the pipeline surface is relatively rough, it can be polished with a grinding wheel until the metallic luster is revealed, and then sandpaper with a particle size of 220-400 mesh is selected for polishing according to the material of the inner tube 11.

[0100] If the inner tube 11 is a non-metallic tube and the surface of the inner tube 11 is smooth, the grinding step can be omitted.

[0101] In addition, after polishing the outer wall of the inner tube 11, the smooth surface can be cleaned with a cotton ball dipped in an organic solvent such as acetone, anhydrous ethanol, trichloroethane, isopropyl alcohol, etc., and cleaned until no stains are visible on the cotton ball.

[0102] Furthermore, the step of bonding the strain sensing element 20 to the smooth surface includes marking and positioning, applying adhesive, and bonding the strain sensing element 20. The following is a detailed description taking the strain sensing element 20 as a strain gauge 21 as an example.

[0103] Marking and positioning: Use a drawing pencil, ballpoint pen or stylus to mark light marks on the smooth surface as positioning lines.

[0104] Apply adhesive: Apply adhesive to smooth surface.

[0105] Pasting of strain detection element 20: Paste the strain gauge 21 with surface treatment on the glue coating position of the smooth surface, and align the center of the strain gauge 21 with the center of the marking line. After confirming that there are no bubbles between the strain gauge 21 and the adhesive and that the adhesive is firmly pasted, cover the surface of the strain gauge 21 with a special protective material and continue to apply external pressure. The strain gauge 21 should not be displaced when the external pressure is applied. If the ambient temperature is low, it is necessary to heat it to about 30°C while applying pressure. Maintain the pressure and temperature for about 12 hours until the adhesive is completely cured.

[0106] After the strain sensing element 20 is bonded to the smooth surface, the bonding quality of the strain gauge 21 can be checked. The inspection contents include: (1) the change in resistance value of the strain gauge 21 before and after bonding; (2) insulation resistance; (3) whether there are residual bubbles in the gauge; (4) whether the position of the strain gauge 21 is accurate; (5) whether there is open circuit, short circuit or deformation of the sensitive grid. Finally, the strain gauge 21 can be completely bonded and protected with shielding tape.

[0107] In the step of connecting the first transmission line 40 to the strain detection element 20, the three leads of the strain gauge 21 are connected to the three wires of the first transmission line 40 according to the same color, and the three connection joints are wrapped with insulating tape respectively and wrapped with shielding tape outside.

[0108] In the step of leading one end of the first transmission line 40 away from the strain sensing element 20 to one end outside the inner tube 11, the first transmission line 40 is bent and arranged on the outer wall of the inner tube 11, and the first transmission line 40 is fixed to the outer wall of the inner tube 11 with tape.

[0109] After the end of the first transmission line 40 away from the strain sensing element 20 is led to the outside of one end of the inner tube 11 , the resistance is tested again at the end of the first transmission line 40 away from the strain sensing element 20 to ensure that the first transmission line 40 is correctly connected to the strain sensing element 20 .

[0110] In the step of fixing the temperature detection element 30 to the outer surface wall of the inner tube 11 , the temperature detection element 30 may be fixed to the outer surface wall of the inner tube 11 by a connecting member such as an adhesive tape or a plaster.

[0111] In the step of leading one end of the second transmission line 50 away from the temperature detection element 30 to one end outside the inner tube 11, the second transmission line 50 is bent and arranged on the outer wall of the inner tube 11, and the second transmission line 50 is fixed to the outer wall of the inner tube 11 with tape.

[0112] After the end of the second transmission line 50 away from the temperature detection element 30 is led to the outside of one end of the inner tube 11, the resistance is tested again at the end of the second transmission line 50 away from the temperature detection element 30 to ensure that the second transmission line 50 is correctly connected to the temperature detection element 30.

[0113] Furthermore, in this embodiment, the heat-insulating outer tube 12 includes an outer protective sleeve 121 and an insulating layer 122. The step of sleeve the heat-insulating outer tube 12 on the outer side of the inner tube 11 includes sleeve the outer protective sleeve 121 on the outer side of the inner tube 11 so that an annular space is formed between the outer protective sleeve 121 and the inner tube 11; and the insulating layer 122 is filled in the annular space. In other embodiments, the insulating layer 122 may be firstly arranged on the outer side of the inner tube 11, and then the outer protective sleeve 121 may be sleeved on the outer side of the insulating layer 122.

[0114] Filling the annular space with an insulating layer 122 is the insulation production of the insulated pipe 100. The insulating layer 122 can be made of a variety of materials, such as a single-layer polyurethane insulation material, a multi-layer insulation material composited with polyurethane and other insulation materials. Before the insulation production of the insulated pipe 100, the first transmission line 40 and the second transmission line 50 can be marked, and the first transmission line 40 and the second transmission line 50 can be tied together with tape, and the insulation production can be carried out according to the insulation production requirements of the insulated pipe. After the insulation production is completed, the resistance value is measured again to ensure that the connection between the first transmission line 40 and the strain detection element 20 and the connection between the second transmission line 50 and the temperature detection element 30 are not damaged during the insulation production. After the resistance test is completed, the first transmission line 40 and the second transmission line 50 can be fixed to the free end of the insulated pipe 100 with tape to ensure that the first transmission line 40 and the second transmission line 50 are not affected during the storage and transportation of the insulated pipe 100.

[0115] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A thermally insulated pipeline, characterized in that: include: The pipe body comprises an inner pipe and an insulating outer pipe, wherein the insulating outer pipe is sleeved on the outer side of the inner pipe; A strain detection element, the strain detection element is located between the inner tube and the thermally insulated outer tube, the strain detection element is attached to the outer wall of the inner tube, and the strain detection element is configured to detect the strain amount of the inner tube; a temperature detection element, the temperature detection element being located between the inner tube and the thermally insulated outer tube, the temperature detection element being configured to detect a temperature of the inner tube; a first transmission line, the first transmission line being electrically connected to the strain detection element, one end of the first transmission line away from the strain detection element extending to the outside of the tube body, the first transmission line being bent and distributed between the inner tube and the thermally insulated outer tube, and one end of the first transmission line away from the strain detection element leading to the outside of one end of the inner tube; as well as A second transmission line, the second transmission line is electrically connected to the temperature detection element, one end of the second transmission line away from the temperature detection element extends to the outside of the tube body, the second transmission line is bent and distributed between the inner tube and the insulated outer tube, and one end of the second transmission line away from the temperature detection element is led to the outside of one end of the inner tube; The insulated pipe also includes a first shielding member and a second shielding member; the first shielding member is connected to the inner tube, and the first shielding member and the inner tube jointly define a first accommodating space, and the strain detection element is located in the first accommodating space; the second shielding member is connected to the inner tube, and the second shielding member and the inner tube jointly define a second accommodating space, and the temperature detection element is located in the second accommodating space, and the second shielding member is a tape.

2. The thermally insulated pipe according to claim 1, characterized in that: The thermal insulation outer tube comprises an outer protective sleeve and a thermal insulation layer; An annular space is formed between the outer protective sleeve and the inner tube, and the heat insulating layer is filled in the annular space.

3. The thermally insulated pipe according to claim 1, characterized in that: The inner tube is a metal tube, and the outer surface wall of the inner tube is provided with an anti-corrosion layer.

4. The thermally insulated pipe according to claim 1, characterized in that: The inner tube is a straight tube of equal diameter or a straight tube of reduced diameter or an elbow tube or a three-way tube.

5. A method for manufacturing an insulated pipe, used for the insulated pipe according to any one of claims 1 to 4, characterized in that: The following steps are involved: Fixing the strain sensing element to the inner tube so that the strain sensing element fits the outer wall of the inner tube; Connecting the first transmission line to the strain sensing element, and leading one end of the first transmission line away from the strain sensing element to the outside of one end of the inner tube; Fixing the temperature detection element to the outer wall of the inner tube; Connecting the second transmission line to the temperature detection element, and leading one end of the second transmission line away from the temperature detection element to the outside of one end of the inner tube; Sleeve the heat-insulating outer tube onto the outer side of the inner tube, so that the strain detection element and the temperature detection element are both located between the inner tube and the heat-insulating outer tube; Among them, the first transmission line is bent and distributed between the inner tube and the insulated outer tube, the second transmission line is bent and distributed between the inner tube and the insulated outer tube, and the insulated pipeline also includes a second shielding member; the second shielding member is connected to the inner tube, and the second shielding member and the inner tube jointly define a second accommodating space, the temperature detection element is located in the second accommodating space, and the second shielding member is a tape.

6. The method for manufacturing an insulated pipe according to claim 5, characterized in that: The step of fixing the strain sensing element to the inner tube comprises: Grinding the outer wall of the inner tube to form a smooth surface; Bond the strain sensing element to a smooth surface.

7. The method for manufacturing an insulated pipe according to claim 5, characterized in that: The thermal insulation outer tube comprises an outer protective sleeve and a thermal insulation layer; The step of sleeve the heat-insulating outer tube on the outer side of the inner tube comprises: The outer protective sleeve is placed on the outer side of the inner tube so that an annular space is formed between the outer protective sleeve and the inner tube; The annular space is filled with a thermal insulation layer.

Images