Anti-freezing multilayer composite heat-insulating jacket for heat tracing pipe

Abstract

This invention relates to the field of thermal insulation sleeves, and more particularly to a frost-resistant multi-layer composite thermal insulation sleeve for heat tracing pipelines. The sleeve includes a pipeline body and an outer sleeve. Pipe flanges are installed at both ends of the pipeline body. An outer sleeve is installed in the middle of the outer periphery of the pipeline body. An inner sleeve is rotatably connected to the middle of the inner sleeve. An annular groove is formed in the middle of the inner side of the inner sleeve, and uniformly distributed spiral grooves are formed inside the annular groove. The inner sleeve is fitted onto the middle of the outer periphery of the pipeline body. Annular chambers are rotatably connected to the outside of both ends of the inner sleeve, and these chambers are installed on both sides inside the outer sleeve. Uniformly distributed guide vanes are fixedly connected to both ends of the outer periphery of the inner sleeve, and these guide vanes are all located inside the annular chambers. This invention, through its rotatable design, ensures that all areas of the outer periphery of the inner sleeve can be evenly fitted with the heat tracing material, completely solving the problem of "uneven local heating" in traditional thermal insulation sleeves and enabling control of the circumferential temperature deviation of the pipeline body.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation sleeves, and more particularly to a frost-resistant multi-layer composite thermal insulation sleeve for heat tracing pipelines. Background Technology

[0002] In pipeline transportation systems of industries such as petroleum, chemical, power, and construction, the freezing, solidification, or viscosity increase of media within pipelines under low-temperature environments has long been a key technical challenge for these industries. Whether it is outdoor crude oil pipelines, corrosive media pipelines in chemical workshops, or fire-fighting water pipes and water supply and drainage pipelines in the construction field, all face the risk of media transportation obstruction in low-temperature winters or cold regions at high latitudes. Traditional pipeline insulation solutions have many significant drawbacks: single insulation layers (such as rock wool and fiberglass wool) rely solely on their own thermal insulation properties to block heat loss, resulting in limited insulation effects. Under extreme low-temperature environments, the rapid heat loss still makes it difficult to prevent media freezing; while fixed heating cables can provide active heat compensation, the fixed fit between the heating cable and the pipeline wall concentrates heat in a localized area, easily leading to uneven temperature distribution around the pipeline. This can not only cause local thermal expansion and contraction imbalances in the pipeline, leading to fatigue damage, but also cause local overheating and deterioration of the media, affecting the quality of transportation and the service life of the pipeline. Therefore, we propose a freeze-resistant multi-layer composite insulation sleeve for heat-traced pipelines to solve the aforementioned problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing a frost-resistant multi-layer composite insulation sleeve for heat tracing pipelines.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a multi-layer composite heat-insulating sleeve for heat tracing pipelines, comprising a pipeline body and an outer sleeve. Pipe flanges are installed at both ends of the pipeline body. An outer sleeve is installed at the center of the outer periphery of the pipeline body. An inner sleeve is rotatably connected to the center of the outer sleeve. An annular groove is formed at the center of the inner side of the inner sleeve, and uniformly distributed spiral grooves are formed on the inner side of the annular groove. The inner sleeve is fitted onto the center of the outer periphery of the pipeline body. Annular compartments are rotatably connected to the outer sides of both ends of the inner sleeve. The annular compartments are installed on both sides inside the outer sleeve. Both ends of the outer periphery of the inner sleeve are fixed. The device is connected to evenly distributed guide vanes, all of which are located inside the annular chamber. A placement chamber is located on one side of the outer circumference of the inner sleeve. The placement chamber is installed inside the outer sleeve. An installation port is opened in the middle of the side of the placement chamber closest to the inner sleeve. A heat tracing cable is engaged inside the installation port. A central plate is installed inside the placement chamber on the side closest to the heat tracing cable. A connecting plate is installed inside the placement chamber on the side furthest from the heat tracing cable. A temperature-conducting plate is installed in the middle of the end of the connecting plate furthest from the heat tracing cable. A connecting piece is fixedly connected to the end of the temperature-conducting plate furthest from the connecting plate. Both ends of the connecting piece are fixedly connected to collars.

[0005] Preferably, both ends of the placement chamber are equipped with a connecting pipe one and a connecting pipe two, and the ends of the connecting pipe one and the connecting pipe two away from the placement chamber are fixedly connected to a ring chamber, and a one-way valve is installed in the middle of the connecting pipe one and the connecting pipe two.

[0006] Preferably, a connecting strip is installed between the connecting pipes, and the connecting pipes and the connecting strip are connected. The connecting strip is located in the middle of one side of the placement chamber.

[0007] Preferably, the connecting strip has a connecting port fixedly connected to the middle of one end near the resettlement compartment, the end of the connecting port penetrates the side wall of the resettlement compartment, and the connecting port is connected to the interior of the resettlement compartment.

[0008] Preferably, a condensing plate is installed on one side of the placement chamber, one end of the condensing plate is fixedly connected to the connecting plate, and the side of the condensing plate near the connecting plate has evenly distributed communication openings.

[0009] Preferably, a slot is provided in the middle between the outer tubes, and the heat-conducting sheet passes through the slot.

[0010] Preferably, the outer circumference of the outer sleeve is provided with a preset groove, and the collar and connecting piece are both disposed inside the preset groove. The side of the collar furthest from the placement chamber is designed as an open type.

[0011] Preferably, a wire is installed at one end of the heat tracing cable, the end of the wire away from the heat tracing cable is used to connect to the power supply equipment, and the end of the wire away from the heat tracing cable passes through the end of the outer sleeve.

[0012] Preferably, a limiting plug is provided in the middle of the outer periphery of the conductor. The limiting plug is a split design and is engaged with the end of the outer sleeve.

[0013] Preferably, the outer sleeve is a split symmetrical design, and the ends of the outer sleeve are connected and installed by connecting bolts.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The heat generated by the heat tracing cable is not only directly conducted to the pipeline, but also transferred to the interior of the installation chamber through the central plate, rapidly heating the stored liquid and causing it to evaporate. The evaporated gas is introduced into the annular chamber through the connecting pipe and makes precise contact with the guide vanes at both ends of the inner sleeve, forming a continuous driving force to drive the inner sleeve to rotate at a uniform speed. The rotation design ensures that all areas of the outer periphery of the inner sleeve can be evenly fitted with the heat tracing cable, completely solving the pain point of "uneven local heating" in traditional insulation sleeves, and enabling the circumferential temperature deviation of the pipeline body to be controlled.

[0016] The heat-conducting oil in the inner sleeve annular groove and spiral groove not only assists in lubrication and reduces rotational wear, but also further disperses heat, effectively preventing medium deterioration caused by heat accumulation in local areas of the pipeline, and reducing fatigue damage caused by uneven thermal expansion and contraction of the pipeline, thus significantly extending the service safety and stability of the pipeline and the internal medium.

[0017] The device forms a closed-loop circulation system of "heating and evaporation, driving rotation, and condensation and recovery" through the built-in liquid storage. The airflow in the ring chamber flows back to the placement chamber through the connecting pipe, connecting strip and connecting port. The low temperature of the external environment is conducted to the condensing plate through the open collar, connecting plate and heat-conducting plate, which quickly condenses the return gas into liquid storage liquid for reuse. No additional driving medium is required. The circulation can be maintained by relying only on the residual heat of the heating cable. Compared with traditional insulation equipment that requires an external power source, the energy consumption is reduced. The later maintenance only requires periodic checks of the liquid storage volume and sealing performance, which greatly reduces the workload and cost of operation and maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation state structure of an antifreeze multi-layer composite thermal insulation sleeve for heat tracing pipelines according to the present invention.

[0019] Figure 2 This is a partial structural diagram of the split state of an antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to the present invention.

[0020] Figure 3 This is a partial structural diagram of the preset groove of a multi-layer composite heat-insulating sleeve for heat tracing pipelines according to the present invention.

[0021] Figure 4 This is a partial structural diagram of the connecting pipe at two points of an antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to the present invention.

[0022] Figure 5 This is a partial structural diagram of the annular compartment of an antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to the present invention.

[0023] Figure 6 This is a partial structural diagram of the condenser plate of a multi-layer composite heat-insulating sleeve for heat tracing pipelines according to the present invention.

[0024] Figure 7 This is a partial structural diagram of the guide vane of a multi-layer composite heat-insulating sleeve for heat tracing pipelines according to the present invention.

[0025] 101. Outer sleeve; 102. Collar ring; 103. Connecting piece; 104. Wire; 105. Pipe flange; 106. Inner sleeve; 107. Pipe body; 108. Connecting pipe one; 109. Ring chamber; 110. Limiting plug; 111. Pre-set groove; 112. Heating tape; 113. Placement chamber; 114. Connecting strip; 115. Temperature conductive plate; 116. Connecting pipe two; 117. Connecting port; 118. Condensing plate; 119. Connecting port; 120. Connecting plate; 121. Installation port; 122. Central plate; 123. Groove; 124. Ring groove; 125. Spiral groove; 126. Guide vane. Detailed Implementation

[0026] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0027] like Figures 1-7 The illustration shows a frost-resistant multi-layer composite insulation sleeve for heat tracing pipelines, comprising a pipeline body 107 and an outer sleeve 101. Pipe flanges 105 are installed at both ends of the pipeline body 107. The outer sleeve 101 is installed in the middle of the outer periphery of the pipeline body 107. The outer sleeve 101 is made of composite insulation material. An inner sleeve 106 is rotatably connected to the middle of the inner sleeve 101. A groove 123 is formed in the middle of the outer sleeve 101, through which a heat-conducting plate 115 passes. A pre-set groove 111 is formed on the outer periphery of the outer sleeve 101. A collar 102 and a connecting piece 103 are both provided in the pre-set groove. Inside the groove 111, the side of the collar 102 away from the installation chamber 113 is open. One end of the heat tracing cable 112 is equipped with a wire 104. The end of the wire 104 away from the heat tracing cable 112 is used to connect to the power supply equipment. The end of the wire 104 away from the heat tracing cable 112 passes through the end of the outer sleeve 101. A limit plug 110 is provided in the middle of the outer periphery of the wire 104. The limit plug 110 is a split design. The limit plug 110 is engaged with the end of the outer sleeve 101. The outer sleeve 101 is a split symmetrical design. The end of the outer sleeve 101 is connected and installed by connecting bolts.

[0028] Furthermore, in practical implementation, when used in cold environments, people can connect to surrounding power supply equipment through wire 104 to supply power to the heating cable 112, enabling the heating cable 112 to work. Through the temperature sensor integrated on the heating cable 112, the temperature of the pipe body 107 and the inner sleeve 106 can be monitored, so that it can work according to the preset value, realize temperature compensation of the pipe body 107, make up for the heat loss of the medium inside the pipe body 107, so that the pipe body 107 can always maintain an ideal temperature and maintain the medium temperature stability, which is beneficial to the medium transportation work in cold environments.

[0029] The installation port 121 is fitted with a heat tracing cable 112 inside. A central plate 122 is installed inside the placement chamber 113 on the side near the heat tracing cable 112. A connecting plate 120 is installed inside the placement chamber 113 on the side away from the heat tracing cable 112. A temperature-conducting plate 115 is installed in the middle of the end of the connecting plate 120 away from the heat tracing cable 112. A connecting piece 103 is fixedly connected to the end of the temperature-conducting plate 115 away from the connecting plate 120. Both ends of the connecting piece 103 are fixedly connected with collars 102. Both ends of the placement chamber 113 are fitted with connecting pipe one 108 and connecting pipe two 116. Both ends of the connecting pipe one 108 and connecting pipe two 116 away from the placement chamber 113 are fixedly connected to a ring chamber 109. A one-way valve is installed in the middle of the connecting pipe one 108 and connecting pipe two 116.

[0030] Furthermore, in specific implementation, when the electric heating component inside the heat tracing cable 112 is working, it generates a large amount of heat, forming a stable heat source. The heat is conducted to the inner sleeve 106 and the placement chamber 113 that are in contact with each other. The heat is transferred through the inner sleeve 106, so that the heat of the heat tracing cable 112 is further conducted to the main pipe body 107 to achieve heat tracing. The working heat of the heat tracing cable 112 can be conducted to the interior of the placement chamber 113 through the central plate 122, thereby heating the liquid stored inside the placement chamber 113 and achieving rapid evaporation of the placement chamber 113. The evaporated gas can be discharged through the connecting pipe 116.

[0031] The inner sleeve 106 has an annular groove 124 in the middle of its inner side, and a spiral groove 125 evenly distributed inside the annular groove 124. Both the annular groove 124 and the spiral groove 125 are filled with heat-conducting oil. The inner sleeve 106 is fitted around the middle of the outer periphery of the pipe body 107. Both ends of the inner sleeve 106 are rotatably connected to annular chambers 109. The annular chambers 109 are installed on both sides inside the outer sleeve 101. Both ends of the outer periphery of the inner sleeve 106 are fixedly connected to evenly distributed guide vanes 126. The guide vanes 126 are all located inside the annular chambers 109. A placement chamber 113 is provided on one side of the outer periphery of the inner sleeve 106. The placement chamber 113 is filled with liquid, which can be a polyol mixture. The placement chamber 113 is installed on one side inside the outer sleeve 101. An installation port 121 is provided in the middle of the side of the placement chamber 113 near the inner sleeve 106.

[0032] Furthermore, in specific implementation, gas is introduced into the inside of the collar 102 and comes into contact with the guide vane 126. The continuously introduced gas drives the guide vane 126 to rotate, which in turn drives the inner sleeve 106 fixed to it to rotate synchronously. The rotation of the inner sleeve 106 ensures uniform contact between the inner sleeve 106 and the heat tracing tape 112, resulting in a more uniform temperature throughout the inner sleeve 106. This is beneficial for heat conduction and temperature compensation of the pipeline body 107. During actual rotation, the heat-conducting oil inside the annular groove 124 and the spiral groove 125 lubricates the inner sleeve 106 and the pipeline body 107. At the same time, during heat transfer, the heat-conducting oil further achieves uniform heat distribution, preventing heat accumulation in local areas of the pipeline body 107 from affecting the internal medium transport and medium quality, which is beneficial for practical use.

[0033] A connecting strip 114 is installed between the connecting pipes 108. The connecting pipes 108 and the connecting strip 114 are connected. The connecting strip 114 is located in the middle of one side of the placement chamber 113. A connecting port 117 is fixedly connected to the middle of the end of the connecting strip 114 near the placement chamber 113. The end of the connecting port 117 penetrates the side wall of the placement chamber 113 and is connected to the inside of the placement chamber 113. A condensing plate 118 is installed on one side inside the placement chamber 113. One end of the condensing plate 118 is fixedly connected to the connecting plate 120. The condensing plate 118 has evenly distributed communication openings 119 on the side near the connecting plate 120.

[0034] Furthermore, in specific implementation, the airflow inside the annular chamber 109 is discharged through the connecting pipe 108. The connecting pipe 108 can further guide the airflow into the connecting strip 114. The gas can be guided back into the placement chamber 113 through the connecting port 117 on the connecting strip 114. After the gas flows back, it will come into contact with the condenser plate 118. In actual use, the collar 102 and the connecting piece 103 can conduct the low temperature of the external environment. Furthermore, the temperature conductive plate 115, the condenser plate 118 and the connecting plate 120 can work together with the collar 102 and the connecting piece 103 to conduct the low temperature of the external environment. The condenser plate 118 and the connecting plate 120 can condense the gas output from the connecting port 117, thereby realizing the condensation and recovery of the liquid stored inside the placement chamber 113 and achieving continuous operation.

[0035] Working principle:

[0036] In practical use in cold environments, the heating cable 112 can be powered by connecting to surrounding power supply equipment via wire 104, enabling its operation. The temperature sensor integrated on the heating cable 112 monitors the temperature of the pipe body 107 and the inner sleeve 106, allowing it to operate according to preset values. This compensates for the temperature loss of the medium within the pipe body 107, maintaining an ideal temperature and ensuring stable medium temperature, which is beneficial for medium transport in cold environments. The heating element inside the heating cable 112 generates a large amount of heat, forming a stable heat source, which is then conducted to the adjacent components. The inner sleeve 106 connects to the mounting chamber 113. Heat is transferred through the inner sleeve 106, allowing the heat from the heating cable 112 to be further conducted to the main pipe body 107 for heat tracing. Simultaneously, the central plate 122 transfers the heat from the heating cable 112 to the interior of the mounting chamber 113, heating the liquid inside and enabling rapid evaporation. The evaporated gas is then discharged through the connecting pipe 116 and introduced into the collar 102, where it contacts the guide vanes 126. The continuously introduced gas drives the guide vanes 126 to rotate, which in turn drives the fixed inner sleeve 107. The inner sleeve 106 rotates synchronously, ensuring uniform contact between it and the heating tape 112. This results in a more uniform temperature distribution within the inner sleeve 106, facilitating heat transfer and temperature compensation for the main pipe 107. During rotation, the heat-conducting oil inside the annular groove 124 and spiral groove 125 lubricates the inner sleeve 106 and the main pipe 107. Furthermore, the heat-conducting oil further disperses heat evenly, preventing localized heat buildup in the main pipe 107 and its impact on internal media transport and quality. This is beneficial for practical use. Additionally, during operation, the airflow inside the annular chamber 109 passes through the connecting pipe 108. The gas is exported and further guided into the connecting strip 114 through the connecting pipe 108. The gas is then guided back into the placement chamber 113 through the connecting port 117 on the connecting strip 114. After the gas flows back, it comes into contact with the condenser plate 118. In actual use, the collar 102 and the connecting piece 103 can conduct the low temperature of the external environment. Furthermore, the temperature-conducting plate 115, the condenser plate 118, and the connecting plate 120 can work together with the collar 102 and the connecting piece 103 to conduct the low temperature of the external environment. The condenser plate 118 and the connecting plate 120 can condense the gas output from the connecting port 117, thereby realizing the condensation and recovery of the liquid stored inside the placement chamber 113 and enabling continuous operation.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A frost-resistant multi-layer composite insulation sleeve for heat tracing pipelines, comprising a pipeline body (107) and an outer sleeve (101), characterized in that: Both ends of the pipe body (107) are equipped with pipe flanges (105). An outer sleeve (101) is installed in the middle of the outer periphery of the pipe body (107). An inner sleeve (106) is rotatably connected to the middle of the inner sleeve (101). An annular groove (124) is formed in the middle of the inner side of the inner sleeve (106). A spiral groove (125) is formed in the inner side of the annular groove (124). The inner sleeve (106) is fitted on the middle of the outer periphery of the pipe body (107). Both ends of the inner sleeve (106) are rotatably connected to annular compartments (109). The annular compartments (109) are all installed on the outer sleeve (101). On both sides of the inner sleeve (106), uniformly distributed guide vanes (126) are fixedly connected to both ends of the outer periphery. The guide vanes (126) are all located inside the annular chamber (109). A placement chamber (113) is provided on one side of the outer periphery of the inner sleeve (106). The placement chamber (113) is installed inside the outer sleeve (101). An installation port (121) is opened in the middle of the side of the placement chamber (113) near the inner sleeve (106). A heat tracing cable (112) is engaged inside the installation port (121). A center plate (122) is installed inside the placement chamber (113) near the heat tracing cable (112). A connecting plate (120) is installed on the side of the placement chamber (113) away from the heat tracing cable (112). A heat-conducting plate (115) is installed in the middle of the end of the connecting plate (120) away from the heat tracing cable (112). A connecting piece (103) is fixedly connected to the end of the heat-conducting plate (115) away from the connecting plate (120). Both ends of the connecting piece (103) are fixedly connected to collars (102). A connecting pipe one (108) and a connecting pipe two (116) are installed at both ends of the placement chamber (113). The ends of the connecting pipe one (108) and the connecting pipe two (116) away from the placement chamber (113) are fixedly connected to collars (102). A fixed-connection ring chamber (109) is provided. One-way valves are installed in the middle of the first connecting pipe (108) and the second connecting pipe (116). A connecting strip (114) is installed between the first connecting pipe (108). The first connecting pipe (108) and the connecting strip (114) are connected. The connecting strip (114) is located in the middle of one side of the placement chamber (113). A connecting port (117) is fixedly connected to the middle of the end of the connecting strip (114) near the placement chamber (113). The end of the connecting port (117) penetrates the side wall of the placement chamber (113). The connecting port (117) is connected to the inside of the placement chamber (113).

2. The antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to claim 1, characterized in that: A condenser plate (118) is installed on one side of the placement chamber (113). One end of the condenser plate (118) is fixedly connected to the connecting plate (120). The condenser plate (118) has evenly distributed communication openings (119) on the side near the connecting plate (120).

3. The antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to claim 1, characterized in that: A slot (123) is provided in the middle between the outer tubes (101), and the heat-conducting sheet (115) passes through the slot (123).

4. The antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to claim 1, characterized in that: The outer sleeve (101) has a preset groove (111) on its outer periphery. The collar (102) and the connecting piece (103) are both located inside the preset groove (111). The side of the collar (102) away from the placement chamber (113) is designed as an open type.

5. The antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to claim 1, characterized in that: One end of the heat tracing cable (112) is equipped with a wire (104). The end of the wire (104) away from the heat tracing cable (112) is used to connect to the power supply equipment. The end of the wire (104) away from the heat tracing cable (112) passes through the end of the outer sleeve (101).

6. A multi-layer composite heat-insulating sleeve for heat tracing pipelines according to claim 5, characterized in that: A limiting plug (110) is provided in the middle of the outer periphery of the conductor (104). The limiting plug (110) is a split design and is engaged at the end of the outer tube (101).

7. The antifreeze multi-layer composite insulation sleeve for heat tracing pipelines according to claim 1, characterized in that: The outer tube (101) is a split symmetrical design, and the ends of the outer tube (101) are connected and installed by connecting bolts.

Images