Electric heat tracing type liquid cargo conveying hose

Abstract

The invention relates to an electric heat tracing type liquid cargo conveying hose which is composed of an inner layer, an outer layer and an electric heat tracing layer between the inner layer and the outer layer, the inner layer is composed of an inner rubber layer, a pressure-bearing framework and a static electricity conducting copper wire, the pressure-bearing framework is arranged between the inner rubber layer and the electric heat tracing layer, and the static electricity conducting copper wire is arranged on the pressure-bearing framework; the electric heat tracing layer is composed of heat tracing cables and filler, the heat tracing cables are spirally wound in the pipe body, and the filler is filled between the heat tracing cables after the heat tracing cables are wound and fixed; the outer layer is composed of a protective adhesive tape layer and an outer adhesive layer arranged outside the protective adhesive tape layer. The constant-power heat tracing cable is wound in the pipe wall, when liquid is conveyed, the hose is heated through the heat tracing cable, a certain temperature is kept in the pipeline, and the condensation phenomenon occurring when the liquid is conveyed in a low-temperature environment is prevented.

Description

Technical Field

[0001] The invention relates to an electrically heated liquid cargo transmission hose, which can be used to transport liquid materials such as oil, fresh water, etc. in low-temperature environments of ice areas and polar regions. Background Art

[0002] In the oil extraction and chemical industries in the cold northern regions and even in the polar regions, the process pipelines and conveying hoses must ensure that they can still convey liquid materials normally and continuously under low temperature conditions. Process pipelines are mostly metal pipes, and their installation positions are fixed. Usually, the heat dissipation and temperature drop of the pipeline can be calculated according to the "GB50253-2014 Oil Pipeline Engineering Design Code" and "SH / T 3040 Petrochemical Pipeline Accompanying Pipe and Jacketed Pipe Design Code", and corresponding heating measures can be taken; because steam and hot water heating have fast heating speed, large heating range and low operating cost, the process pipeline is usually arranged with seamless steel pipes on the outside to pass high-temperature steam or hot water, and then hard or semi-hard circular insulation materials are laid. If soft materials are used, wire mesh must be used to fix the accompanying pipe and the insulation layer to ensure the heating space.

[0003] Hoses under low temperature conditions also need to have insulation capabilities or take insulation measures to maintain the temperature of the liquid cargo in the pipe to ensure that it is in a flowing state. Since the hose body is usually made of non-metallic materials, it is easy to age at high temperatures, so steam or hot water heating is generally not used. In situations where the hose does not move after installation, insulation materials can be bundled outside the pipe to slow down the temperature drop inside the pipe; when the hose is bent and stretched after installation, the insulation materials bundled outside the pipe will limit the movement of the pipe body. Therefore, semi-rigid insulation materials consistent with the pipe shape are generally integrated into the pipe body during hose manufacturing to form an insulated hose. Another effective measure to improve the conveying capacity of the hose in a low temperature environment is to embed a heating cable in the pipe body and use electrical energy for heating. The heating temperature of the cable used for heating is controllable, which will not significantly affect the performance of the hose body and meet the requirements of liquid transportation in a low temperature environment.

[0004] Patent application 200910067040.7 utilizes two reinforcement layers in a composite pipe for electrical heating, and there is an insulating layer between the two reinforcement layers. Since this patent uses the two reinforcement layers as positive and negative electrodes to directly connect to the power supply for heating, once the heating function of the reinforcement layer is damaged, the entire reinforcement layer must be removed and the composite pipe must be repackaged, which wastes materials and makes the replacement procedure cumbersome.

[0005] Patent application CN200910067040.7 utilizes two reinforcement layers in a composite pipe for electrical heating, and there is an insulating layer between the two reinforcement layers. This connection method cannot achieve heating of the hose.

[0006] Patent application CN203453700U adds a self-regulating heating cable to the hose, but this method is limited by the effective use length of the self-regulating cable, and it is difficult to produce a single electric heating hose with a length exceeding 100m. In addition, the cable junction box in this patent is arranged outside the tube body, which seriously affects the winding of the hose on the reel. Summary of the invention

[0007] The present invention proposes an electrically heated liquid cargo transport hose, which has a constant power heating cable wound in the pipe wall. When the liquid is transported, the hose is heated by the heating cable, so that a certain temperature is maintained in the pipeline to prevent condensation when the liquid is transported in a low-temperature environment. It can be used for liquid cargo transportation in low-temperature environments such as ice areas and polar regions.

[0008] To achieve the above-mentioned purpose, the technical scheme of the present invention is: an electric heating liquid cargo transmission hose, composed of an inner layer, an outer layer and an electric heating layer between the inner layer and the outer layer, the inner layer is composed of an inner rubber layer, a pressure-bearing skeleton, and an electrostatic conductive copper wire, a pressure-bearing skeleton is provided between the inner rubber layer and the electric heating layer, and an electrostatic conductive copper wire is provided on the pressure-bearing skeleton; the electric heating layer is composed of a heating cable and a filler, the heating cable is spirally wound in the pipe body, and the filler is filled between the heating cables after winding and fixing; the outer layer is composed of a protective tape layer and an outer rubber layer arranged outside the protective tape layer.

[0009] Furthermore, the inner layer's pressure-bearing skeleton includes a first tape layer, a second tape layer, a spiral steel wire, a third tape layer, and a fourth tape layer. After the inner tape layer is formed, the first tape layer, the second tape layer, the static-conducting copper wire, the spiral steel wire, the third tape layer, and the fourth tape layer are successively wound.

[0010] Furthermore, the inner rubber layer is made of hydrogenated nitrile rubber; the tape layer serves as the skeleton of the hose and is composed of a polyester cord fabric with high strength and low elastic modulus. The polyester cord fabric winding layer is wound in even numbers, using 2 layers or 4 layers of cross winding, with 2 layers as a cross layer, so that the hose is subjected to balanced force, and the number of layers and thickness can meet the bursting pressure requirements of the hose.

[0011] Furthermore, the adhesive tape layer is cross-wound around four layers of cord fabric at a balanced angle, and the winding balanced angle is 54°44′.

[0012] Furthermore, the static conductive copper wire is used to conduct away the static charge generated during the oil transportation process, and is composed of a plurality of thin copper wires.

[0013] Furthermore, the spiral steel wire is wound inside the tube body to enhance the hose's ability to withstand positive and negative pressures. The gaps after the spiral steel wire is wound are filled with filling glue, and adhesive glue is used on the inner and outer layers of the spiral steel wire to increase the bonding force with adjacent adhesive layers.

[0014] Furthermore, the heating cable is a constant power heating cable, which is used to heat the pipe body so as to maintain a certain temperature of the pipe body.

[0015] Furthermore, the outer protective tape layer is composed of a pasting rubber layer and a fifth tape layer. After the heating cable and the filling rubber are formed, the pasting rubber layer, the fifth tape layer and the outer rubber layer are wound successively.

[0016] Furthermore, the outer rubber layer is made of natural rubber NR + EPDM which are resistant to aging, UV rays and wear.

[0017] Furthermore, the filling rubber adopts highly wear-resistant carbon black and a semi-reinforcement material with low heat generation.

[0018] The beneficial effects of the present invention are:

[0019] (1) The present invention winds a constant power heating cable in the pipe wall. When the liquid is transmitted, the hose is heated by the heating cable so that a certain temperature is maintained in the pipe to prevent condensation of the liquid when it is transported in a low temperature environment.

[0020] (2) The inner tube billet cord winding layer is wound in even numbers, 2 layers, or 4 layers of cross winding, 2 layers as a cross layer, so that the hose is stressed evenly;

[0021] (3) It has a spiral steel wire layer to support the tube body and enhance the hose's ability to withstand positive and negative pressures;

[0022] (4) With heating cable, which is spirally wound on the inner tube;

[0023] (5) There are two layers of curtains wrapped around the outside of the heating cable to protect the heating layer;

[0024] (6) The heating cable is of constant power type. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the electric heating type liquid cargo transmission hose of the present invention.

[0026] Figure 2 It is a cross-sectional schematic diagram of the electric heating type liquid cargo transmission hose of the present invention;

[0027] In the figure: 1. Inner rubber layer, 2. First tape layer, 3. Second tape layer, 4. Static-conducting copper wire, 5. Spiral steel wire, 6. Filling rubber, 7. Third tape layer, 8. Fourth tape layer, 9. Heating cable, 10. Middle rubber, 11. Fifth tape layer, 12. Outer rubber layer, 20. Inner layer, 21. Electric heating layer, 22. Outer layer. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 1As shown in Figure 2, an electric heating type liquid cargo transmission hose of the present invention is composed of an inner layer 20, an electric heating layer 21, and an outer layer 22. The inner layer 20 is composed of an inner rubber layer 1, a pressure-bearing skeleton, and a static conductive copper wire 4. The electric heating layer 21 is composed of a constant power heating cable 9 and an intermediate rubber 10. The heating cable 9 is spirally wound in the pipe body. After being wound and fixed, a low-density intermediate rubber 10 is filled between the heating cables 9. The intermediate rubber 10 can not only fill the gaps of the heating cables, but also play a role in heat preservation; the outer layer is composed of a protective tape layer and an outer rubber layer 12.

[0030] The specific features of this electric heating liquid cargo transfer hose are:

[0031] (1) The inner layer is the tube blank of the entire electric heating type liquid cargo transfer hose, which is composed of an inner rubber layer 1, a first rubber tape layer 2, a second rubber tape layer 3, a static conductive copper wire 4, a spiral steel wire 5, a third rubber tape layer 7, and a fourth rubber tape layer 8.

[0032] (2) The inner rubber layer 1 is made of hydrogenated nitrile rubber. After the inner rubber layer 1 is formed, a first rubber tape layer 2, a second rubber tape layer 3, a static conductive copper wire 4, a spiral steel wire 5, a third rubber tape layer 7, and a fourth rubber tape layer 8 are successively wound around it.

[0033] (3) The inner rubber layer 1 is in direct contact with the oil and is immersed in the oil for a long time. It is composed of hydrogenated nitrile rubber with good oil resistance. The first rubber layer 2, the second rubber layer 3, the third rubber layer 7, and the fourth rubber layer 8 are used to withstand the internal pressure of the conveyed liquid and the tension generated by the dragging of the hose. They are composed of high-strength rubberized polyester cord fabrics.

[0034] (4) The tape layer is the skeleton of the hose, which is composed of polyester cord fabric with high strength and low elastic modulus. The cord fabric winding layer should be wound in even numbers, that is, it should be 2 layers or 4 layers of cross winding, with 2 layers as a cross layer, so that the hose is stressed evenly. The number of layers and thickness can meet the bursting pressure requirements of the hose.

[0035] (5) In order to ensure that the hose has better dimensional stability under pressure, the tape layer is cross-wound with four layers of fabric at a balanced angle, and the winding balance angle is 54°44′.

[0036] (6) The static-conducting copper wire 4 can conduct away the static charge generated during the oil transportation process, and is composed of a plurality of thin copper wires.

[0037] (7) The spiral steel wire 5 is wound inside the tube body to enhance the ability of the hose to withstand positive and negative pressures. The gaps after the steel wire is wound are filled with filling glue, and adhesive glue is used on the inner and outer layers of the spiral steel wire 5 to increase the bonding force with the adjacent adhesive layers.

[0038] (8) The heating cable 9 is spirally wound on the inner tube blank, and the gaps within the pitch are filled with an intermediate glue 10.

[0039] (9) The heating cable 9 is used to heat the pipe body to maintain a certain temperature of the pipe body. In order to meet the needs of long-distance transportation, the present invention uses a constant power heating cable, which can be spliced ​​at any length according to the heating section according to the usage.

[0040] (10) The outer layer is composed of a rubber layer, a fifth adhesive tape layer 11 and an outer rubber layer 12. After the heating cable 9 and the filling rubber are formed, the rubber layer, the fifth adhesive tape layer 11 and the outer rubber layer 12 are wound successively.

[0041] (11) The outer rubber layer 12 is made of natural rubber NR + EPDM which is resistant to aging, UV rays and wear. The outer coating of the pipe body uses EPDM with good ozone and UV aging resistance as the rubber type. The vulcanization system uses metal oxides and sulfur as the vulcanization system, sulfonamide accelerators as the vulcanization accelerator system, and anti-ozonants as the protection system to increase the resistance of the rubber to ozone and UV aging. In order to ensure the bonding performance of the rubber, adhesives are added as auxiliary materials.

[0042] (12) Selection of reinforcing fillers. The reinforcing fillers selected are highly wear-resistant carbon black and semi-reinforcing materials with low heat generation. These materials give the rubber compound good tensile strength, tear strength and elongation, and also give the rubber compound certain wear resistance.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this patent, rather than to limit it. Although this patent has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of this patent.

Claims

1. An electrically heated liquid cargo transmission hose, characterized in that: It consists of an inner layer, an outer layer and an electric heating layer between the inner and outer layers. The inner layer consists of an inner rubber layer, a pressure-bearing frame and static-conducting copper wires. A pressure-bearing frame is provided between the inner rubber layer and the electric heating layer, and a static-conducting copper wire is provided on the pressure-bearing frame. The electric heating layer consists of a heating cable and a filler. The heating cable is spirally wound in the pipe body, and the filler is filled between the heating cables after the winding is fixed. The outer layer consists of a protective tape layer and an outer rubber layer arranged outside the protective tape layer.

2. The electrically heated liquid cargo transmission hose according to claim 1 is characterized in that: The inner layer of the pressure-bearing skeleton includes the first tape layer, the second tape layer, the spiral steel wire, the third tape layer, and the fourth tape layer. After the inner layer is formed, the first tape layer, the second tape layer, the static conductive copper wire, the spiral steel wire, the third tape layer, and the fourth tape layer are successively wound.

3. The electrically heated liquid cargo transmission hose according to claim 2 is characterized in that: The inner rubber layer is made of hydrogenated nitrile rubber; the tape layer serves as the skeleton of the hose and is composed of polyester cord fabric with high strength and low elastic modulus. The polyester cord fabric winding layer is wound in even numbers, using 2 layers or 4 layers of cross winding, with 2 layers as a cross layer, so that the hose is subjected to balanced force, and the number of layers and thickness can meet the bursting pressure requirements of the hose.

4. The electrically heated liquid cargo transmission hose according to claim 3 is characterized in that: The tape layer is cross-wound with four layers of cord fabric at a balanced angle, and the winding balance angle is 54°44′.

5. The electrically heated liquid cargo transmission hose according to claim 1 is characterized in that: The static conductive copper wire is used to conduct away the static charge generated during the oil transportation process and is composed of multiple thin copper wires.

6. The electrically heated liquid cargo transmission hose according to claim 1, characterized in that: The spiral steel wire is wound inside the pipe body to enhance the hose's ability to withstand positive and negative pressures. The gaps after the spiral steel wire is wound are filled with filling glue, and adhesive glue is used on the inner and outer layers of the spiral steel wire to increase the bonding force with adjacent adhesive layers.

7. The electrically heated liquid cargo transmission hose according to claim 1 is characterized in that: The heating cable is a constant power heating cable, which is used to heat the pipe body to maintain a certain temperature.

8. The electrically heated liquid cargo transmission hose according to claim 1 is characterized in that: The outer protective tape layer is composed of a pasting rubber layer and a fifth tape layer. After the heating cable and the filling rubber are formed, the pasting rubber layer, the fifth tape layer and the outer rubber layer are wound successively.

9. The electrically heated liquid cargo transmission hose according to claim 1, characterized in that: The outer rubber layer is made of natural rubber NR + EPDM which is resistant to aging, UV rays and wear.

10. The electrically heated liquid cargo transmission hose according to claim 1, characterized in that: The filling rubber adopts highly wear-resistant carbon black and semi-reinforcement material with low heat generation.

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