A polar vacuum aerogel insulated constant temperature water pipe and its production process

Abstract

The present invention belongs to the technical field of conveying pipelines, and specifically relates to a polar vacuum aerogel insulated constant temperature water pipe, comprising a plurality of sections and a heat shrinkable sleeve, each section comprising an inner pipe section and an outer pipe section, a first annular cavity is provided between the outer pipe section and the inner pipe section, the inner pipe section comprises a female connecting pipe head, a male connecting pipe head and a main action section, the female connecting pipe head and the male connecting pipe head are respectively located on both sides of the main action section, the female connecting pipe head and the male connecting pipe head are respectively extended out of the two ends of the outer pipe section, the female connecting pipe head and the male connecting pipe head can be coaxially connected together to form a transition splicing section, and the heat shrinkable sleeve can be sleeved outside the transition splicing section; the present invention provides a production process for a polar vacuum aerogel insulated constant temperature water pipe, which is simple and fast to splice, reduces the time workers are in extremely bad weather, consumes very little energy for splicing, and basically does not cause pollution to the polar environment.

Description

Technical Field

[0001] The invention relates to the technical field of transportation pipelines, and in particular to a polar vacuum aerogel insulated constant-temperature water pipe and a production process thereof. Background Art

[0002] Antarctica occupies one sixth of the Earth's surface. This cold continent, which is mainly covered by ice and snow, provides a natural venue for many important scientific studies. Surveys and observations of marine ecology, sea ice, glaciers, sea level, atmosphere, geophysics, high-altitude atmospheric physics, terrestrial ecology, terrestrial and marine geology, and birds in the Antarctic region will provide basic support for assessing the Antarctic ecological environment and climate change; they are of extraordinary value for understanding the global system and the impact of climate change.

[0003] my country is one of the few countries in the world that can independently carry out scientific research in the polar regions, establish scientific research stations, and conduct continuous scientific observations. In order to ensure that scientific researchers can study seawater in the scientific research stations around the clock without having to go to the coast to collect water, a seawater sampling and transportation pipeline system for automatically transporting seawater has become indispensable.

[0004] However, due to the harsh polar environment, poor construction conditions, and various international treaties with high requirements for Antarctic environmental protection, it is also required that the splicing of pipelines should be as simple, fast, reliable, clean and environmentally friendly as possible. Conventional splicing methods are welding and bonding. Due to the high temperature requirements during welding, welding cannot be performed at low temperatures, and there is a shortage of polar welding equipment and energy. In addition, welding will produce welding exhaust gas and dust, and the method of bonding pipelines will cause the glue to evaporate into the atmosphere, which is not conducive to environmental protection. In addition, the Antarctic environment is relatively cold, and seawater samples are more likely to leak heat when they are taken from the sea and transported in pipelines, especially at the joints of the pipelines. In extreme weather, the seawater is easily frozen, affecting transportation and research. Summary of the invention

[0005] Therefore, the problem of the existing technology is that the existing pipelines are prone to heat leakage at the joints and have poor insulation effect, which is not conducive to transporting seawater samples that need to be studied in the polar regions. In addition, the existing pipelines are not only time-consuming and labor-intensive to splice, but also require a lot of energy and cause great pollution to the environment.

[0006] In order to solve the above technical problems, the present invention provides a polar vacuum aerogel insulated constant temperature water pipe, comprising a plurality of segments, a heat shrinkable sleeve, a nano aerogel felt and a nano aerogel powder, each segment comprising an inner pipe segment and an outer pipe segment, the inner pipe segment and the outer pipe segment are concentrically arranged, the inner pipe segment is arranged in the outer pipe segment, and a first annular cavity is provided between the outer pipe segment and the inner pipe segment.

[0007] The inner pipe section includes a female connecting pipe head, a male connecting pipe head and a main action section, the female connecting pipe head and the male connecting pipe head are respectively located on both sides of the main action section, and the length of the main action section is consistent with the length of the outer pipe section, the female connecting pipe head and the male connecting pipe head are respectively extended outside the two ends of the outer pipe section, the adjacent segments are called the first segment and the second segment, the first segment includes the female connecting pipe head and the first outer pipe section, the second segment includes the male connecting pipe head and the second outer pipe section, the female connecting pipe head and the male connecting pipe head can be coaxially connected together to form a transition splicing section, the ends of the first outer pipe section and the second outer pipe section adjacent to each other are respectively called the first end and the second end, the two ends of the heat shrinkable sleeve are respectively sleeved and fixed outside the first end and the second end, and the first annular cavity is filled with the nano aerogel powder;

[0008] A second annular cavity is provided between the heat shrinkable sleeve and the transition splicing section, and the second annular cavity is filled with the nano aerogel felt.

[0009] Each of the two ends of each segment is provided with a concentric heat-conducting pipe with different diameters, and the heat-conducting pipe is made of stainless steel. Each of the heat-conducting pipes includes a small-diameter end and a large-diameter end. The small-diameter end is sleeved and welded outside the inner pipe segment, and the large-diameter end is welded to the end of the outer pipe segment, and the outer peripheral edge of the heat-conducting pipe is a curve.

[0010] Preferably, the male connector includes a first tube body and a first convex ring, the first convex ring is concentrically fixed on the outer circumferential surface of the first tube body, and the female connector includes a second tube body and a third tube body, the outer circumferential surface of the second tube body is fixed with a second convex ring, the inner wall surface of the third tube body is provided with a first step and a second step along the axial direction respectively, the diameter of the first step is larger than the diameter of the second step, the male connector and the second tube body can be coaxially arranged and simultaneously penetrated into the third tube body, the outer circumferential surface of the first convex ring is provided with a thread, the inner wall of the first step is provided with a thread, the first convex ring can be threadedly connected to the first step, and the second convex ring can just penetrate into the second step and be limited by the second step.

[0011] Preferably, a sealing ring is sleeved on one end of the first tube body adjacent to the second tube body, and one end of the second tube body adjacent to the first tube body abuts against an end surface of the sealing ring.

[0012] Preferably, it further comprises a plurality of inner thermal insulation supports arranged at intervals, wherein the inner thermal insulation supports are sleeved and fixed outside the inner pipe section, and the outer portion of the inner thermal insulation supports are sleeved and fixed outside the outer pipe section.

[0013] Preferably, the inner insulation support includes two semicircular hoop plates that can be coupled to each other, and the two hoop plates clamp the inner pipe section after being coupled to each other. A plurality of support blocks extending radially along the inner insulation support are evenly spaced outside the hoop plates, and the outer ends of the support blocks can be slidably connected to the inner wall surface of the outer pipe section.

[0014] The present invention provides a production process of a polar vacuum aerogel insulation constant temperature water pipe, comprising the following steps:

[0015] S1. Use an automatic argon arc welding machine to weld the female connecting pipe head and the male connecting pipe head at both ends of the main action section to form an inner pipe section;

[0016] S2. Carry out sealing and pressure tests on the inner pipe section: a. Use two pipe end plugging tools to plug the female connecting pipe head and the male connecting pipe head on the inner pipe section in S respectively; b. Connect the pressure gauge, stop valve, hose and pressure pump in sequence on the outside of the pipe end plugging tool; c. Start the pressure pump, open the stop valve, and close the stop valve when the pressure value detected by the pressure gauge reaches the required value. Then observe the pressure gauge within a period of time. If the pressure value remains in the vicinity of the pressure value, it means that the sealing and pressure resistance of the inner pipe section are good;

[0017] The conditions and process of inner tube pressure test:

[0018] a) The inner tube of the double-walled pipe is welded according to the design requirements, and the welds are qualified after on-site inspection;

[0019] b) The test medium that meets the requirements has been prepared; the hydraulic medium is clean fresh water, and the chloride ion content in the water does not exceed 30ppm;

[0020] c) The pressure gauge used in the test has been calibrated and qualified (the calibration date is valid during the test period), the accuracy of the pressure gauge is not less than Class 1.5, the full scale value of the gauge is 1.5 to 2 times the maximum measured pressure, and there are no less than two pressure gauges;

[0021] d) Before the test, use compressed air to remove dust and debris in the pipe; if necessary, use a cloth to clean it;

[0022] e) When the ambient temperature of the test site is below 5°C, anti-freezing measures must be taken;

[0023] f) If there is no abnormality in the water injection inspection, the pressure can be increased. The pressure increase process should be slow and steady. First, the pressure is increased to 0.5 MPa, and a comprehensive inspection of the pipeline system is carried out. If there is a problem, the pressure should be released for repair. It is strictly forbidden to repair under pressure. If there is no abnormality, continue to increase the pressure, first to 25%, 50%, and 75% of the test pressure in sequence, and maintain the pressure for 10 minutes at each step, and finally increase to the test pressure;

[0024] g) After the pressure test is qualified, the test medium should be discharged at a suitable location outdoors, and attention should be paid to safety;

[0025] h) After the pressure test is completed, all temporary devices should be removed in time, the records should be checked, and the "Hydraulic Pressure Test Record" should be filled in;

[0026] S3. Assemble the inner insulation bracket: determine the position of the inner insulation bracket according to the drawing, and fix the inner insulation bracket with a torque wrench according to the specified torque;

[0027] S4. Install the outer pipe segment: Use professional pipe-threading equipment to install the outer pipe segment on the inner pipe to form a segment;

[0028] S5. First, weld the heat conducting pipes to the two ends of the outer pipe section, then weld the heat conducting pipes to the inner pipe section, and then weld the vacuum nozzles to the through holes on the circumferential surface of the outer pipe section, and inspect the welding quality of the heat conducting pipes and the vacuum nozzles to determine whether they are qualified; the above welding processes are required to comply with the WPS standard;

[0029] S6. Filling with nano aerogel powder

[0030] a. Before filling the nano aerogel powder, the segment should be manufactured and inspected according to the relevant standards and drawings, and the segment structure should meet the drawings and process requirements before filling the nano aerogel powder; note that the explosion-proof cover must be fixed firmly with a special clamp to prevent it from flying out and injuring people during inflation;

[0031] b. After the first annular cavity is evacuated to about -0.08MPa, it starts to absorb nano aerogel powder; in order to facilitate the filling of nano aerogel powder, nitrogen gas not exceeding 0.02MPa should be introduced into the nano aerogel powder tank; when the nano aerogel powder in the first annular cavity is filled to about 1 / 2 of the volume, dry nitrogen (or dry oil-free compressed air) from a pressure storage tank is used to pressurize once after each filling of nano aerogel powder, and the operating pressure is equal to the working pressure of the segment and not more than 0.3MPa until the filling is dense; during the filling and compacting process, a vibrator should be installed on the upper part of the segment to ensure that the filling degree reaches the required state;

[0032] c. During the filling process, the nano aerogel powder must not come into contact with the atmosphere to prevent water absorption; after the filling is completed, the vacuum push-pull valve should be used to operate the plug and the end cap should be added to seal the opening to prevent air from entering the interlayer;

[0033] d. The total amount of nano-aerogel powder filled in each segment (under natural stacking state) should be filled according to 1.2±0.1 times of the interlayer volume of the segment or the amount required by the process; for the segments filled with nano-aerogel powder, the segments should be weighed and recorded before and after filling, and the filling amount should be strictly controlled;

[0034] e. Specific operation steps

[0035] A1. Connect the nano aerogel powder storage tank to be filled into the powder filling system;

[0036] A1.1 The nitrogen accumulator tank inlet valve and the aerogel powder tank return valve are connected to the gas supply system. The gas used is nitrogen. The return valve inlet pressure does not exceed 0.02MPa. Make sure that the delivery valve, air release valve, air inlet valve and return valve are in the closed state;

[0037] A1.2 For all sections with working pressure less than 0.3MPa, before filling with nano-aerogel powder, the inner tube section must be filled with nitrogen for internal pressure protection, and the pressure is the working pressure; for all double-walled tubes with working pressure greater than 0.3MPa but inner tube thickness less than 8mm, before filling with nano-aerogel powder, the inner container must be filled with 0.3MPa nitrogen for internal pressure protection to prevent segment instability;

[0038] A1.3 Turn on the vacuum pump to evacuate the first annular cavity of the segment;

[0039] A2 filled nano aerogel powder

[0040] A2.1 When the pressure gauge of the aerogel tank shows -0.08MPa, you can start filling. First open the return air valve at the bottom of the nano aerogel powder tank, then open the nano aerogel powder delivery valve, and fill the first annular cavity of the segment with negative pressure;

[0041] A2.2 While filling the nano-aerogel powder, open the air inlet valve to pressurize the nitrogen pressure accumulator. When the working pressure of the inner pipe section of the segment is greater than 0.3MPa, the nitrogen pressure accumulator is pressurized to 0.3MPa; when the working pressure of the inner pipe section of the segment is less than 0.3MPa, the nitrogen pressure accumulator is pressurized to the working pressure of the inner pipe section. After the pressurization is completed, close the air inlet valve;

[0042] A2.3 When the first annular cavity is filled with nano-aerogel powder to about half, stop filling; close the delivery valve, quickly open the vent valve, and allow the dry gas in the nitrogen pressure accumulator to quickly flow to the first annular cavity of the segment to compact the filled nano-aerogel powder, and then close the vent valve;

[0043] A2.4 Continue to evacuate the first annular cavity. When the pressure gauge of the aerogel tank shows -0.08MPa, open the nano-aerogel powder delivery valve to continue filling the first annular cavity with powder. Control the timing and frequency of inflation and compaction of the first annular cavity according to the volume of the first annular cavity and the on-site filling conditions. During the filling and compaction process, a vibrator should be installed on the upper part of the segment to achieve an ideal filling degree.

[0044] A2.5 Repeat the evacuation, filling and compacting steps A1.3-A2.4 until the nano aerogel powder stops flowing and fills the first annular cavity of the segment, and close the nano aerogel powder delivery valve;

[0045] A2.6 Open the vent valve to flush nitrogen into the first annular cavity until the pressure gauge of the aerogel storage tank shows 0 MPa, then close the vent valve;

[0046] A2.7 Remove the powder filling port from the top interface of the segment; use a probe to check the filling of the aerogel powder to ensure that the first annular cavity is completely filled without any gaps; if the nano aerogel powder is loose or gaps are found, reconnect the aerogel powder delivery system to refill until it meets the requirements;

[0047] A2.8 Assemble and weld the powder filling hole reinforcement plate according to the drawing requirements; assemble the explosion-proof port components according to the drawing, and temporarily seal the outer circles of the upper and lower flanges with glue;

[0048] A2.9 After the tank interlayer is filled, the tank interlayer is evacuated to a vacuum degree of less than 5 Pa, and a segment having the first annular cavity filled with nano-aerogel powder can be obtained;

[0049] S7. Polar field installation: Pre-sleeve the heat shrink tube on the outside of the segment, then splice the female connecting pipe head and the male connecting pipe head together, then fill the nano aerogel felt into the heat shrink tube sleeved on the segment, then move the heat shrink tube to the splicing transition section, and then heat and shrink the mouth of the heat shrink tube, so that the heat shrink tube seals the splicing transition section.

[0050] The technical solution of the present invention has the following beneficial effects:

[0051] The present invention provides a polar vacuum aerogel insulation constant temperature water pipe, comprising a plurality of segments, a heat shrinkable sleeve, a nano aerogel felt and a nano aerogel powder, each segment comprising an inner pipe segment and an outer pipe segment, the inner pipe segment being arranged inside the outer pipe segment, a first annular cavity being arranged between the outer pipe segment and the inner pipe segment, each inner pipe segment comprising a female connecting pipe head, a male connecting pipe head and a main action segment, the female connecting pipe head and the male connecting pipe head being respectively located at both sides of the main action segment, and the two segments spliced ​​to each other are called a first segment and a second segment;

[0052] The female connecting pipe head of the inner pipe section of the first section and the male connecting pipe head of the inner pipe section of the second section are connected to each other, and the two ends of the heat shrinkable sleeve are respectively sleeved on the ends of the outer pipe section of the first section and the outer pipe section of the second section that are close to each other, so as to play the role of splicing the two outer pipe sections. In this way, the two sections are spliced ​​together, making the splicing simple and fast, without using more energy, and greatly reducing the time that the installation workers are in a harsh low-temperature environment;

[0053] The present invention does not require welding or bonding during splicing, thus preventing welding and bonding from causing pollution to the Antarctic environment.

[0054] The heat shrink tubing not only serves to splice the two outer pipe sections, but also acts as a seal to prevent air from entering the joints. The heat is conducted out with the help of air, and it also prevents heat from escaping from the gaps, thus playing a role of heat preservation.

[0055] There is an annular cavity between the heat shrinkable sleeve and the joint, and the annular cavity is filled with nano aerogel felt. The nano aerogel felt has extremely low thermal conductivity and good thermal insulation, which can prevent the heat on the joint from being transferred out through the air in the annular cavity, further improving the thermal insulation effect of the joint;

[0056] Each segment has a concentric heat pipe with different diameters at both ends. The heat pipe is made of stainless steel. Each heat pipe includes a small diameter end and a large diameter end. The small diameter end is sleeved and fixed outside the inner pipe section, and the large diameter end is fitted and fixed to the end of the outer pipe section. The outer edge of the heat pipe is a curve. Because the outer edge of the heat pipe is curved, the heat transfer distance is extended compared to the straight distance between the inner pipe section and the heat shrink sleeve, thereby achieving low thermal conductivity, and further improving the insulation effect of the pipe joint to prevent the temperature of the seawater sample from changing too much. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Description of reference numerals: 1, segment; 11, inner pipe section; 111, female connecting pipe head; 111a, first pipe body; 111b, first convex ring; 112, male connecting pipe head; 112a, second pipe body; 112b, third pipe body; 112c, second convex ring; 113, main action section; 12, outer pipe section; 2, heat shrinkable sleeve; 3, nano aerogel felt; 4, nano aerogel powder; 5, first annular cavity; 6, First section; 61, first outer tube section; 61a, first end; 62, first inner tube section; 7, second section; 71, second outer tube section; 71a, second end; 72, second inner tube section; 8, heat transfer tube; 81, small diameter end; 82, large diameter end; 9, second annular cavity; 10, inner insulation bracket; 101, hoop plate; 102, support block; 20, sealing ring; C1, aerogel storage tank; C2, nitrogen pressure storage tank; V1, delivery valve; V2, air release valve; V3, air intake valve;

[0059] Figure 1 It is a schematic diagram of a segment of the present invention;

[0060] Figure 2 It is a schematic diagram of the section of the present invention (without filling of nano aerogel powder);

[0061] Figure 3 It is a schematic diagram of two segment splicing sections of the present invention;

[0062] Figure 4 It is an exploded schematic diagram of the female connecting pipe head and the male connecting pipe head of the present invention;

[0063] Figure 5 It is a schematic diagram of the female connecting pipe head and the male connecting pipe head of the present invention being connected together;

[0064] Figure 6 It is a schematic diagram of two segment splicing sections of the present invention (without filling of nano aerogel felt);

[0065] Figure 7 is a cross-sectional view of the heat conducting pipe of the present invention;

[0066] Figure 8 It is a front view of the heat conducting pipe of the present invention;

[0067] Fig. 9 is a cross-sectional view of the internal insulation bracket of the present invention;

[0068] Fig.10 It is a three-dimensional schematic diagram of the internal insulation bracket of the present invention;

[0069] Fig.11 It is a schematic diagram of welding a female connecting pipe head and a male connecting pipe head to an inner pipe section of the present invention;

[0070] Fig.12 A schematic diagram of installing a pipe end plugging tool for an inner pipe section of the present invention;

[0071] Fig.13 A schematic diagram of the inner pipe section of the present invention being connected to a pressure gauge, a stop valve, a hose and a pressure pump after the upper pipe end plugging tool is installed;

[0072] Fig.14 A schematic diagram of installing an inner insulation bracket on an inner pipe section of the present invention;

[0073] Fig.15 This is a schematic diagram of the present invention after the outer pipe section is installed;

[0074] Fig.16 It is a schematic diagram of the present invention after welding the heat conducting pipe and the vacuum nozzle;

[0075] Fig.17 This is a schematic diagram of the present invention when the segment is filled with nano aerogel powder;

[0076] Fig.18 This is a schematic diagram of the segment of the present invention after being filled with nano aerogel. DETAILED DESCRIPTION

[0077] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0079] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0081] like Figure 1-Figure 3As shown, the present invention provides a polar vacuum aerogel insulation constant temperature water pipe, comprising a plurality of segments 1, a heat shrinkable sleeve 2, a nano aerogel felt 3 and a nano aerogel powder 4, each segment 1 comprises an inner pipe segment 11 and an outer pipe segment 12, the inner pipe segment 11 and the outer pipe segment 12 are concentrically arranged, the inner pipe segment 11 is arranged in the outer pipe segment 12, a first annular cavity 5 is arranged between the outer pipe segment 12 and the inner pipe segment 11, the inner pipe segment 11 comprises a female connecting pipe head 111, a male connecting pipe head 112 and a main action section 113, the female connecting pipe head 111 and the male connecting pipe head 112 are respectively located on both sides of the main action section 113, and the main action section 113 is provided with a first annular cavity 5 between the outer pipe segment 12 and the inner pipe segment 11, and the inner pipe segment 11 comprises a female connecting pipe head 111, a male connecting pipe head 112 and a main action section 113, the female connecting pipe head 111 and the male connecting pipe head 112 are respectively located on both sides of the main action section 113, and the main action section 113 is provided with a first annular cavity 5 between the outer pipe segment 12 and the inner pipe segment 11. The length of the section 113 is consistent with the length of the outer pipe section 12. The female connecting pipe head 111 and the male connecting pipe head 112 extend out of the two ends of the outer pipe section 12 respectively. The adjacent spliced ​​sections are respectively called the first section 6 and the second section 7. The first section 6 includes the female connecting pipe head 111, the first outer pipe section 61 and the first inner pipe section 62. The second section 7 includes the male connecting pipe head 112, the second outer pipe section 71 and the second inner pipe section 72. The female connecting pipe head 111 and the male connecting pipe head 112 can be coaxially connected together to form a transition splicing section, thereby splicing the first inner pipe section 62 and the second inner pipe section 72 together.

[0082] like Figure 4-Figure 5 As shown, the female connecting pipe head 111 includes a first tube body 111a and a first convex ring 111b, and the first convex ring 111b is concentrically fixed on the outer circumference of the first tube body 111a. The male connecting pipe head 112 includes a second tube body 112a and a third tube body 112b. The outer circumference of the second tube body 112a is fixed with a second convex ring 112c, and the inner wall of the third tube body 112b is provided with a first step and a second step along the axial direction respectively. The diameter of the first step is greater than the diameter of the second step. The female connecting pipe head 111 and the second tube body 112a can be coaxially arranged and simultaneously penetrate into the third tube body 112b. The outer circumference of the first convex ring 111b is provided with a thread, and the inner wall of the first step is provided with a thread. The first convex ring 111b can be threadedly connected to the first step, and the second convex ring 112c can just penetrate into the second step and be limited by the second step.

[0083] One end of the first tube body 111a adjacent to the second tube body 112a is sleeved with a sealing ring 20, and one end of the second tube body 112a adjacent to the first tube body 111a abuts against the end surface of the sealing ring 20. The sealing ring 20 can improve the sealing between the first tube body 111a and the second tube body 112a, ensuring that the joint of the two segments 1 does not leak the medium.

[0084] like Figure 3As shown, the ends of the first outer tube section 61 and the second outer tube section 71 adjacent to each other are respectively called the first end 61a and the second end 71a, and the two ends of the heat shrinkable tube 2 are respectively sleeved and fixed outside the first end 61a and the second end 71a. The heat shrinkable tube 2 plays the role of sealing the transition splicing section. First, it can prevent air leakage and heat leakage at the splicing position, and second, it can connect the first outer tube section 61 and the second outer tube section 71.

[0085] When the seawater sample is transported using a transport pipeline, the seawater is transported in the inner pipe section 11 .

[0086] like Figure 1-Figure 2 As shown, the first annular cavity 5 is filled with nano-aerogel powder 4. The main function of the nano-aerogel powder 4 is to play a role in heat insulation and prevent the medium in the inner pipe section 11 from losing too much heat.

[0087] Each segment 1 has a concentric heat-conducting pipe 8 of different diameters at both ends. The heat-conducting pipe 8 is made of stainless steel. Each heat-conducting pipe 8 includes a small-diameter end 81 and a large-diameter end 82. The small-diameter end 81 is sleeved and welded outside the inner pipe section 11, and the large-diameter end 82 is welded to the end of the outer pipe section 12, and the outer peripheral edge of the heat-conducting pipe 8 is a curve. Since the outer edge of the heat-conducting pipe 8 is a curve, the heat transfer distance is extended compared to the original straight-line distance between the inner pipe section 11 and the heat shrinkable sleeve 2, thereby achieving low thermal conductivity, avoiding serious heat leakage problems at the pipe joints, and preventing the temperature of the seawater sample from changing too much.

[0088] like Figure 1 , Figure 3 and Figure 6 As shown, there is a second annular cavity 9 between the heat shrinkable sleeve 2 and the transition splicing section, and the second annular cavity 9 is filled with nano aerogel felt 3. The nano aerogel felt 3 has an extremely low thermal conductivity and good thermal insulation, which can prevent the heat on the transition splicing section from being transferred out through the air in the second annular cavity 9, and can also ensure that the heat on the heat pipe 8 is transferred along the route of the heat pipe 8, thereby preventing the transported seawater from losing too much heat when flowing through the transition splicing section.

[0089] like Figure 1 , Fig. 9 and Fig.10 As shown, the present invention also includes a plurality of spaced inner insulation brackets 10, which are sleeved and fixed outside the inner pipe section 11, and the outer pipe section 12 is sleeved and fixed outside the inner insulation brackets 10. The main function of the inner insulation brackets 10 is to concentrically support the inner pipe section 11 inside the outer pipe section 12.

[0090] The inner insulation support 10 includes two semicircular hoop plates 101 that can be matched and connected to each other. After the two hoop plates 101 are matched and connected, they clamp the inner pipe section 11. A number of support blocks 102 extending radially along the inner insulation support 10 are evenly spaced outside the hoop plates 101, and the outer ends of the support blocks 102 can be slidably connected to the inner wall surface of the outer pipe section 12.

[0091] A production process of a polar vacuum aerogel insulated constant temperature water pipe comprises the following steps:

[0092] like Fig.11 As shown, S1. The two ends of the main action section are welded with a female connecting pipe head 111 and a male connecting pipe head 112 to form an inner pipe section 11 by an automatic argon arc welding machine;

[0093] like Fig.12 and Fig.13 As shown, S2. Perform sealing and pressure tests on the inner pipe section 11: a. Use two pipe end plugging tools to respectively plug the female connecting pipe head 111 and the male connecting pipe head 112 on the inner pipe section 11 in S1; b. Connect the pressure gauge, stop valve, hose and pressure pump in sequence on the outside of the pipe end plugging tool; c. Start the pressure pump, open the stop valve, and close the stop valve when the pressure value detected by the pressure gauge reaches the required value, and then observe the pressure gauge within a period of time. If the pressure value remains in the range near the pressure value, it means that the sealing and pressure resistance of the inner pipe section 11 are good; the sealing test can prevent the inner pipe section 11 from leaking when conveying the medium, and the pressure test can detect the pressure resistance of the inner pipe section 11 to prevent the inner pipe section 11 from being damaged due to its pressure resistance being lower than the pressure of the medium;

[0094] The conditions and process of inner tube pressure test:

[0095] a) The inner tube of the double-walled pipe is welded according to the design requirements, and the welds are qualified after on-site inspection;

[0096] b) The test medium that meets the requirements has been prepared; the hydraulic medium is clean fresh water, and the chloride ion content in the water does not exceed 30ppm;

[0097] c) The pressure gauge used in the test has been calibrated and qualified (the calibration date is valid during the test period), the accuracy of the pressure gauge is not less than Class 1.5, the full scale value of the gauge is 1.5 to 2 times the maximum measured pressure, and there are no less than two pressure gauges;

[0098] d) Before the test, use compressed air to remove dust and debris in the pipe; if necessary, use a cloth to clean it;

[0099] e) When the ambient temperature of the test site is below 5°C, anti-freezing measures must be taken;

[0100] f) If there is no abnormality in the water injection inspection, the pressure can be increased. The pressure increase process should be slow and steady. First, the pressure is increased to 0.5 MPa, and a comprehensive inspection of the pipeline system is carried out. If there is a problem, the pressure should be released for repair. It is strictly forbidden to repair under pressure. If there is no abnormality, continue to increase the pressure, first to 25%, 50%, and 75% of the test pressure in sequence, and maintain the pressure for 10 minutes at each step, and finally increase to the test pressure;

[0101] g) After the pressure test is qualified, the test medium should be discharged at a suitable location outdoors, and attention should be paid to safety;

[0102] h) After the pressure test is completed, all temporary devices should be removed in time, the records should be checked, and the "Hydraulic Pressure Test Record" should be filled in;

[0103] S3. Assembly of the inner insulation bracket 10: According to the drawings to determine the position of the inner insulation bracket 10, use a torque wrench to fix the inner insulation bracket 10 at the specified torque;

[0104] like Fig.14 As shown, S4. Set the outer pipe segment 12: Use professional pipe-threading equipment to set the outer pipe segment 12 on the inner pipe to form segment 1;

[0105] like Fig.15 As shown, S5. First, weld the heat conducting pipe 8 to the two ends of the outer pipe section 12, then weld the heat conducting pipe 8 to the inner pipe section 11, and then weld the vacuum nozzle to the through hole on the circumferential surface of the outer pipe section 12, and inspect the welding quality of the heat conducting pipe 8 and the vacuum nozzle to determine whether they are qualified; the above welding processes are required to comply with the WPS standard;

[0106] like Figure 16-Figure 18 As shown, S6. Filled with nano aerogel powder 4

[0107] a. Before filling the nano-aerogel powder 4, the segment 1 should be manufactured and inspected according to the relevant standards and drawings, and the structure of the segment 1 should meet the drawings and process requirements before filling the nano-aerogel powder 4; note that the explosion-proof cover must be fixed firmly with a special clamp to prevent it from flying out and injuring people during inflation;

[0108] b. After the first annular cavity 5 is evacuated to about -0.08MPa, it starts to absorb the nano aerogel powder 4; in order to facilitate the filling of the nano aerogel powder 4, nitrogen gas not exceeding 0.02MPa should be introduced into the nano aerogel powder 4 tank; when the nano aerogel powder 4 of the first annular cavity 5 is filled to about 1 / 2 of the volume, dry nitrogen (or dry oil-free compressed air) is flushed into the pressure storage tank after each filling of the nano aerogel powder 4 for compaction, and the operating pressure is equal to the working pressure of the segment 1 and not more than 0.3MPa until the filling is dense; during the filling and compaction process, a vibrator should be installed on the upper part of the segment 1 to ensure that the filling degree reaches the required state;

[0109] c. During the filling process, the nano aerogel powder 4 must not be exposed to the atmosphere to prevent water absorption; after the filling is completed, the vacuum push-pull valve should be operated to seal the plug and add the end cap to prevent air from entering the interlayer;

[0110] d. The total amount of nano-aerogel powder 4 filled in each segment 1 (under natural stacking state) should be filled according to 1.2±0.1 times of the interlayer volume of segment 1 or the amount required by the process; for the segment 1 filled with nano-aerogel powder 4, the segment 1 should be weighed and recorded before and after filling, and the filling amount should be strictly controlled;

[0111] e. Specific operation steps

[0112] A1. Connect the nano-aerogel powder storage tank 4 to be filled into the powder filling system;

[0113] A1.1 The nitrogen accumulator tank C2 air inlet valve V3 and the aerogel powder tank air return valve V4 are connected to the air supply system. The gas used is nitrogen. The inlet pressure of the air return valve V4 does not exceed 0.02MPa. Make sure that the delivery valve V1, the air release valve V2, the air inlet valve V3, and the air return valve V4 are in the closed state;

[0114] A1.2 For all sections 1 with working pressure less than 0.3MPa, before filling the nano aerogel powder 4, the inner tube section 11 must be filled with nitrogen for internal pressure protection, and the pressure is the working pressure; for all double-walled tubes with working pressure greater than 0.3MPa but the thickness of the inner tube section 11 is less than 8mm, before filling the nano aerogel powder 4, the inner container must be filled with 0.3MPa nitrogen for internal pressure protection to prevent the section 1 from becoming unstable;

[0115] A1.3 Turn on the vacuum pump to evacuate the first annular cavity 5 of segment 1;

[0116] A2. Filled with nano aerogel powder 4

[0117] A2.1 When the pressure gauge of the aerogel storage tank C1 shows -0.08MPa, filling can be started. First, open the return air valve V4 at the bottom of the nano aerogel powder 4 tank, then open the nano aerogel powder 4 delivery valve V1, and perform negative pressure filling into the first annular cavity 5 of segment 1;

[0118] A2.2 While filling the nano-aerogel powder 4, open the air inlet valve V3 to pressurize the nitrogen pressure accumulator (C2). When the working pressure of the inner pipe section 11 of the segment 1 is greater than 0.3 MPa, the nitrogen pressure accumulator (C2) is pressurized to 0.3 MPa; when the working pressure of the inner pipe section 11 of the segment 1 is less than 0.3 MPa, the nitrogen pressure accumulator (C2) is pressurized to the working pressure of the inner pipe section 11. After the pressurization is completed, close the air inlet valve V3;

[0119] A2.3 When the first annular cavity 5 is filled with the nano-aerogel powder 4 to about half, stop filling; close the delivery valve V1, quickly open the vent valve V2, so that the dry gas in the nitrogen pressure accumulator C2 quickly flows to the first annular cavity 5 of segment 1 to compact the filled nano-aerogel powder 4, and then close the vent valve V2;

[0120] A2.4 Continue to evacuate the first annular cavity 5. When the pressure gauge of the aerogel storage tank C1 displays -0.08 MPa, open the nano-aerogel powder 4 delivery valve V1 to continue filling the first annular cavity 5 with powder; control the timing and frequency of inflation and compaction of the first annular cavity 5 according to the volume of the first annular cavity 5 and the on-site filling conditions. During the filling and compaction process, a vibrator should be installed on the upper part of the segment 1 to achieve an ideal filling degree;

[0121] A2.5 Repeat the evacuation, filling and compacting steps A1.3-A2.4 until the nano-aerogel powder 4 stops flowing and fills the first annular cavity 5 of the segment 1, and close the nano-aerogel powder 4 delivery valve V1;

[0122] A2.6 Open the vent valve V2 to inject nitrogen into the first annular cavity 5 until the pressure gauge of the aerogel storage tank C1 shows 0 MPa, then close the vent valve V2;

[0123] A2.7 Remove the powder filling port from the top interface of segment 1; use a probe to check the filling of aerogel powder to ensure that the first annular cavity 5 is completely filled without any gaps; if the nano aerogel powder 4 is loose or gaps are found, reconnect the aerogel powder delivery system to refill until it meets the requirements;

[0124] A2.8 Assemble and weld the powder filling hole reinforcement plate according to the drawing requirements; assemble the explosion-proof port components according to the drawing, and temporarily seal the outer circles of the upper and lower flanges with glue;

[0125] A2.9 After the tank interlayer is filled, the tank interlayer is evacuated to a vacuum degree of less than 5 Pa, and the segment 1 having the first annular cavity 5 filled with nano-aerogel powder 4 can be obtained;

[0126] S7. Polar field installation: Pre-sleeve the heat shrinkable tube 2 on the outside of the segment 1, then splice the female connecting pipe head 111 and the male connecting pipe head 112 together, then fill the nano aerogel felt 3 into the heat shrinkable tube 2 sleeved on the segment, and then move the heat shrinkable tube 2 to the splicing transition section, and then heat and shrink the mouth end of the heat shrinkable tube 2, so that the heat shrinkable tube 2 seals the splicing transition section.

[0127] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A production process for polar vacuum aerogel insulation constant temperature water pipe, characterized in that: The steps include: S1. Using an automatic argon arc welding machine, the two ends of the main action section are respectively welded with a female connecting pipe head (111) and a male connecting pipe head (112) to form an inner pipe section (11); S2. Perform a sealing and pressure test on the inner pipe section (11): a. Use two pipe end plugging tools to respectively plug the female connecting pipe head (111) and the male connecting pipe head (112) on the inner pipe section (11) in S1; b. Connect the pressure gauge, stop valve, hose and pressure pump in sequence to the outside of the pipe end plugging tool; c. Start the pressure pump and open the stop valve. When the pressure value detected by the pressure gauge reaches the required value, close the stop valve. Then observe the pressure gauge for a period of time. If the pressure value remains in the vicinity of the pressure value, it indicates that the sealing and pressure resistance of the inner pipe section are good. The conditions and process of inner tube pressure test: a) The inner tube of the double-walled pipe is welded according to the design requirements, and the welds are qualified after on-site inspection; b) The test medium that meets the requirements has been prepared; the hydraulic medium is clean fresh water, and the chloride ion content in the water does not exceed 30ppm; c) The pressure gauge used in the test has been calibrated and qualified, the accuracy of the pressure gauge is not less than Class 1.5, the full scale value of the gauge is 1.5 to 2 times the maximum measured pressure, and there are no less than two pressure gauges; d) Before the test, use compressed air to remove dust and debris in the pipe; and clean it with a cloth; e) When the ambient temperature of the test site is below 5°C, anti-freezing measures shall be adopted; f) If there is no abnormality during water injection inspection, the pressure can be increased. The pressure increase process should be slow and steady. First, the pressure should be increased to 0.5 MPa. A comprehensive inspection of the pipeline system should be carried out. If there is any problem, the pressure should be relieved and repaired. It is strictly forbidden to repair under pressure. If there is no abnormality, the pressure can be increased. First, it should be increased to 25%, 50%, and 75% of the test pressure in sequence. The pressure should be maintained for 10 minutes at each step, and finally it should be increased to the test pressure. g) After the pressure test is qualified, the test medium should be discharged at a suitable location outdoors, and attention should be paid to safety; h) After the pressure test is completed, all temporary devices should be removed in time, the records should be checked, and the "Hydraulic Pressure Test Record" should be filled in; S3. Assembling the inner insulation bracket (10): Determine the position of the inner insulation bracket (10) according to the drawing, fix the inner insulation bracket (10) with a torque wrench according to the specified torque; S4. Attach the outer pipe segment (12): Attach the outer pipe segment (12) to the inner pipe using professional pipe-threading equipment to form a segment (1); S5. First, weld the heat conducting pipe (8) to the two ends of the outer pipe section (12), then weld the heat conducting pipe (8) to the inner pipe section (11), and then weld the vacuum nozzle to the through hole on the circumferential surface of the outer pipe section (12), and inspect the welding quality of the heat conducting pipe (8) and the vacuum nozzle to determine whether they are qualified; the above welding processes are required to comply with the WPS standard; S6. Filled with nano aerogel powder (4) a. Before the nano-aerogel powder (4) is filled, the segment (1) should be manufactured and inspected according to the relevant standards and drawings, and the segment (1) structure should meet the drawings and process requirements before the nano-aerogel powder (4) can be filled. Note that the explosion-proof cover should be fixed firmly with a special clamp to prevent it from flying out and injuring people during inflation; b. After the first annular cavity (5) is evacuated to about -0.08MPa, the nano-aerogel powder (4) is sucked in. In order to facilitate the filling of the nano-aerogel powder (4), nitrogen gas at a pressure not exceeding 0.02MPa should be introduced into the nano-aerogel powder (4) tank. When the nano-aerogel powder (4) in the first annular cavity (5) is filled to about 1 / 2 of its volume, dry nitrogen or dry oil-free compressed air from a pressure storage tank is used to pressurize the nano-aerogel powder (4) once after each filling. The operating pressure is equal to the working pressure of the segment (1) and is not greater than 0.3MPa until the filling is dense. During the filling and compacting process, a vibrator should be installed on the upper part of the segment (1) to ensure that the filling degree reaches the required state. c. During the filling process, the nano-aerogel powder (4) must not come into contact with the atmosphere to prevent water absorption; after the filling is completed, the vacuum push-pull valve should be operated to seal the plug and the end cap should be added to prevent air from entering the interlayer; d. The total amount of nano-aerogel powder (4) filled in each segment (1) shall be 1.2±0.1 times the interlayer volume of the segment (1) or the amount required by the process; for the segment (1) filled with nano-aerogel powder (4), the segment (1) shall be weighed and recorded before and after filling, and the filling amount shall be strictly controlled; e. Specific operation steps A1. Connect the nano-aerogel powder (4) storage tank to be filled into the powder filling system; A1.1 The air inlet valve (V3) of the nitrogen accumulator tank (C2) and the air return valve (V4) of the aerogel powder tank are connected to the air supply system. The gas used is nitrogen, and the inlet pressure of the air return valve (V4) does not exceed 0.02MPa. Make sure that the delivery valve (V1), the air release valve (V2), the air inlet valve (V3), and the air return valve (V4) are in the closed state; A1.2 For all sections (1) with a working pressure less than 0.3 MPa, before filling the nano-aerogel powder (4), the inner tube section (11) is filled with nitrogen for internal pressure protection, and the pressure is the working pressure; for all double-walled tubes with a working pressure greater than 0.3 MPa but a thickness of the inner tube section (11) less than 8 mm, before filling the nano-aerogel powder (4), the inner tube section (11) is filled with 0.3 MPa nitrogen for internal pressure protection to prevent the section (1) from becoming unstable; A1.3 Turn on the vacuum pump to evacuate the first annular cavity (5) of the segment (1); A2. Filled with nano aerogel powder (4) A2.1 When the pressure gauge of the aerogel storage tank (C1) shows -0.08 MPa, filling can be started by first opening the return air valve (V4) at the bottom of the nano-aerogel powder (4) tank, and then opening the nano-aerogel powder (4) delivery valve (V1) to perform negative pressure filling into the first annular cavity (5) of the segment (1); A2.2 While filling the nano-aerogel powder (4), the air inlet valve (V3) is opened to pressurize the nitrogen pressure accumulator (C2). When the working pressure of the inner pipe section (11) of the segment (1) is greater than 0.3 MPa, the nitrogen pressure accumulator (C2) is pressurized to 0.3 MPa; when the working pressure of the inner pipe section (11) of the segment (1) is less than 0.3 MPa, the nitrogen pressure accumulator (C2) is pressurized to the working pressure of the inner pipe section (11), and the air inlet valve (V3) is closed after the pressurization is completed; A2.3 When the first annular cavity (5) is filled with the nano-aerogel powder (4) to about half, the filling is stopped; the delivery valve (V1) is closed, and the venting valve (V2) is quickly opened to allow the dry gas in the nitrogen pressure accumulator (C2) to quickly flow to the first annular cavity (5) of the segment (1) to compact the filled nano-aerogel powder (4), and then the venting valve (V2) is closed; A2.4 Continue to evacuate the first annular cavity (5). When the pressure gauge of the aerogel storage tank (C1) displays -0.08 MPa, open the nano-aerogel powder (4) delivery valve (V1) to continue filling the first annular cavity (5). The timing and frequency of filling and compacting the first annular cavity (5) are controlled according to the volume of the first annular cavity (5) and the on-site filling conditions. During the filling and compacting process, a vibrator should be installed on the upper part of the segment (1) to achieve an ideal filling degree. A2.5 Repeat the evacuation, filling and compacting steps A1.3-A2.4 until the nano aerogel powder (4) stops flowing and fills the first annular cavity (5) of the segment (1), and close the nano aerogel powder (4) delivery valve (V1); A2.6 Open the vent valve (V2) to inject nitrogen into the first annular cavity (5) until the pressure gauge of the aerogel storage tank (C1) shows 0 MPa, and then close the vent valve (V2); A2.7 Remove the powder filling port from the top interface of the segment (1); use a probe to check the filling status of the aerogel powder to ensure that the first annular cavity (5) is completely filled without any gaps; when the nano aerogel powder (4) is loose or gaps are found, reconnect the aerogel powder delivery system to refill until the requirements are met; A2.8 Assemble and weld the powder filling hole reinforcement plate according to the drawing requirements; assemble the explosion-proof port components according to the drawing, and temporarily seal the outer circles of the upper and lower flanges with glue; A2.9 After the first annular cavity (5) of the interlayer of the segment (1) is filled, the first annular cavity (5) of the interlayer of the segment (1) is evacuated to a vacuum degree of less than 5 Pa, thereby obtaining a segment (1) having the first annular cavity (5) filled with the nano-aerogel powder (4); S7. Polar field installation: Pre-sleeve the heat shrinkable tube (2) on the outside of the segment (1), then splice the female connecting tube head (111) and the male connecting tube head (112) together, then fill the nano aerogel felt (3) into the heat shrinkable tube (2) sleeved on the segment (1), then move the heat shrinkable tube (2) to the splicing transition section, and then heat and shrink the mouth end of the heat shrinkable tube (2), so that the heat shrinkable tube (2) seals the splicing transition section; The heat-insulating constant-temperature water pipe comprises a plurality of segments (1), each of the segments (1) comprising an inner pipe segment (11) and an outer pipe segment (12), the inner pipe segment (11) and the outer pipe segment (12) being arranged concentrically, the inner pipe segment (11) being arranged inside the outer pipe segment (12), and a first annular cavity (5) being arranged between the outer pipe segment (12) and the inner pipe segment (11); It also includes a heat shrink tubing (2), a nano aerogel felt (3) and a nano aerogel powder (4). The inner pipe section (11) comprises a main action section (113), a female connecting pipe head (111) and a male connecting pipe head (112) respectively located on both sides of the main action section (113), and the length of the main action section (113) is consistent with the length of the outer pipe section (12), the female connecting pipe head (111) and the male connecting pipe head (112) respectively extend out of the two ends of the outer pipe section (12), the adjacent spliced ​​sections (1) are called the first section (6) and the second section (7), the first section (6) comprises the female connecting pipe head (111) and the first outer pipe section (61), the second section (7) comprises the male connecting pipe head (112) and the second outer pipe section (71), the female connecting pipe head (111) and the male connecting pipe head (112) can be coaxially connected together to form a transition splicing section; The ends of the first outer tube section (61) and the second outer tube section (71) adjacent to each other are respectively referred to as the first end (61a) and the second end (71a), and the two ends of the heat shrinkable tube (2) are respectively sleeved and fixed outside the first end (61a) and the second end (71a); The first annular cavity (5) is filled with the nano aerogel powder (4); A second annular cavity (9) is provided between the heat shrinkable sleeve (2) and the transition joint section, and the second annular cavity (9) is filled with the nano aerogel felt (3); Each of the two ends of the segment (1) is provided with a concentric heat-conducting pipe (8) of different diameters, the heat-conducting pipe (8) being made of stainless steel, and each of the heat-conducting pipes (8) comprising a small-diameter end (81) and a large-diameter end (82), the small-diameter end (81) being sleeved and welded outside the inner pipe section (11), the large-diameter end (82) being welded to the end of the outer pipe section (12), and the outer peripheral edge of the heat-conducting pipe (8) being a curve.

2. The production process of a polar vacuum aerogel insulated constant temperature water pipe according to claim 1, characterized in that: The female connecting pipe head (111) comprises a first pipe body (111a) and a first convex ring (111b), wherein the first convex ring (111b) is concentrically fixed to the outer peripheral surface of the first pipe body (111a), and the male connecting pipe head (112) comprises a second pipe body (112a) and a third pipe body (112b), wherein the outer peripheral surface of the second pipe body (112a) is fixed with a second convex ring (112c), and the inner wall surface of the third pipe body (112b) is provided with a first step and a second step respectively along the axial direction, and the diameter of the first step is The diameter of the female connecting pipe head (111) and the second pipe body (112a) can be coaxially arranged and simultaneously penetrate into the third pipe body (112b), the first convex ring (111b) can be exactly located in the first step, the outer peripheral surface of the first convex ring (111b) is provided with a thread, the inner wall of the first step is provided with a thread, the first convex ring (111b) and the first step can be threadedly connected, and the second convex ring (112c) can be exactly penetrated into the second step and limited by the second step.

3. The production process of a polar vacuum aerogel insulated constant temperature water pipe according to claim 2, characterized in that: One end of the first tube body (111a) adjacent to the second tube body (112a) is sleeved with a sealing ring (20), and one end of the second tube body (112a) adjacent to the first tube body (111a) abuts against the end surface of the sealing ring (20).

4. The production process of a polar vacuum aerogel insulated constant temperature water pipe according to claim 1, characterized in that: It also comprises a plurality of internal heat-insulating supports (10) arranged at intervals, wherein the internal heat-insulating supports (10) are sleeved and fixed outside the inner pipe section (11), and the outer portion of the internal heat-insulating supports (10) is sleeved inside the outer pipe section (12).

5. The production process of a polar vacuum aerogel insulated constant temperature water pipe according to claim 4, characterized in that: The inner thermal insulation support (10) comprises two semicircular hoop plates (101) that can be matched and connected to each other, and the two hoop plates (101) are matched and connected to clamp the inner pipe section (11), and a plurality of support blocks (102) extending radially along the inner thermal insulation support (10) are evenly spaced outside the hoop plates (101), and the outer ends of the support blocks (102) are slidably connected to the inner wall surface of the outer pipe section (12).

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