Directly-buried heat preservation pipeline for large-temperature-difference heat supply unit

Abstract

The invention belongs to the field of directly-buried heat preservation pipelines, and particularly relates to a directly-buried heat preservation pipeline for a large-temperature-difference heat supply unit, which comprises a working steel pipe, a reinforcing frame is welded and fixed on the working steel pipe, an outer protection steel pipe is welded and fixed on the reinforcing frame, a fixing ring is welded and fixed on the outer protection steel pipe, and a mounting cylinder is welded and fixed on the fixing ring. A sealing splicing assembly is mounted on the mounting cylinder, a concentric alignment assembly is mounted on the mounting cylinder, the sealing splicing assembly comprises a sealing ring and a telescopic hose, one end of the telescopic hose is fixedly connected to the sealing ring, and the other end of the telescopic hose is fixedly connected to a fixing ring; the directly-buried heat preservation pipeline solves the problems that an existing directly-buried heat preservation pipeline cannot conduct convenient and stable sealing protection treatment on the welding position of the directly-buried heat preservation pipeline, so that moisture and air in the outside easily make contact with the directly-buried heat preservation pipeline, and the heat preservation performance of the directly-buried heat preservation pipeline is reduced, and even the directly-buried heat preservation pipeline is corroded and damaged.

Description

Technical Field

[0001] The invention relates to the field of directly buried thermal insulation pipes, in particular to a directly buried thermal insulation pipe for a large temperature difference heating unit. Background Art

[0002] In recent years, with the country's increasing emphasis on energy conservation and environmental protection, the centralized heating sector has seen numerous innovations. Among these, large-temperature-difference heat pump units, thanks to their high efficiency and energy-saving characteristics, have been widely used in centralized heating systems that utilize waste heat from power plants. As the technology matures, large-temperature-difference heating increases the temperature difference between the heat source outlet and the user's end-use water, reducing heat transfer flow, thereby lowering pipeline transmission energy consumption while improving the utilization rate of heat source equipment. This is a key technical path to achieving clean heating and green development. Direct-buried insulated pipes, as the core infrastructure of large-temperature-difference heating systems, have a direct impact on their safety, stability, and economic efficiency.

[0003] However, there are some problems in the actual use of existing direct-buried insulated pipes. For example, a direct-buried polyurethane insulated pipe with publication number CN119042412B can drive the direct-buried insulated pipe to move up and down through a lifting mechanism to facilitate subsequent concentric alignment, but it can only drive the direct-buried insulated pipe to move up and down in the groove, but cannot drive the direct-buried insulated pipe to move horizontally in the groove. At the same time, it cannot continue to maintain the support and protection of the welding joints after the direct-buried insulated pipes are connected. Therefore, when the welding joints of the direct-buried insulated pipes are subjected to uneven force, cracking is very likely to occur, and the practicality is poor; and in the actual working process, it cannot perform convenient and stable sealing and protection treatment on the welding joints of the direct-buried insulated pipes. Therefore, moisture and air in the outside world can easily come into contact with it, resulting in reduced insulation performance of the direct-buried insulated pipes or even corrosion damage. Therefore, it is necessary to provide a direct-buried insulated pipe for a large temperature difference heating unit to meet the needs of users. Summary of the Invention

[0004] In view of the problems existing in the existing directly buried insulated pipes for large temperature difference heating units, the present invention is proposed.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions: A directly buried insulated pipe for a large temperature difference heating unit, comprising a working steel pipe, a reinforcement frame welded and fixed to the working steel pipe, an outer protective steel pipe welded and fixed to the reinforcement frame, a fixing ring welded and fixed to the outer protective steel pipe, a mounting tube welded and fixed to the fixing ring, a sealing splicing assembly installed on the mounting tube, a concentric alignment assembly installed on the mounting tube, the sealing splicing assembly comprising a sealing ring and a telescopic hose, one end of the telescopic hose fixedly connected to the sealing ring, the other end of the telescopic hose fixedly connected to the fixing ring, a first sealing groove and a second sealing groove being provided on the mounting tube, a first rubber airbag being fixedly connected in the first sealing groove, and a second rubber airbag being fixedly connected in the second sealing groove.

[0006] As a preferred solution of the present invention, the reinforcement frame is V-shaped, and there are six groups of reinforcement frames, which are distributed at equal angles on the working steel pipe. Each group of reinforcement frames is equidistantly distributed on the working steel pipe. A protective layer is provided on the outer protective steel pipe, and the material of the protective layer is high-density polyethylene. An insulation layer is provided inside the outer protective steel pipe, and the material of the insulation layer is polyurethane foam. The fixing rings are symmetrically distributed on both sides of the outer protective steel pipe, and the inner diameter of the outer protective steel pipe is equal to the inner diameter of the fixing ring. The fixing ring is rotatably connected to the rotating ring through a bearing.

[0007] As a preferred solution of the present invention, the fixed ring and the rotating ring correspond to each other one to one, a first connecting rod is welded and fixed on the rotating ring on one side, and a second connecting rod is welded and fixed on the rotating ring on the other side, a card slot is opened through the first connecting rod, a fifth spring is welded and fixed on the second connecting rod, a card rod is welded and fixed on the fifth spring, and the card rod is slidably connected to the second connecting rod.

[0008] As a preferred solution of the present invention, wherein: the sealing ring is welded and fixed on the mounting tube, the sealing ring is in contact with the protective layer, a guide rod is welded and fixed on the sealing ring, a limiting groove is provided on the guide rod, a guide groove is provided through the fixing ring, the guide rod is slidingly connected in the guide groove, the guide rods are distributed at equal angles on the sealing ring, the guide rods correspond one-to-one to the guide grooves, and the limiting grooves are equidistantly distributed on the guide rod.

[0009] As a preferred solution of the present invention, wherein: a first spring is welded and fixed in the fixing ring, a limiting block is welded and fixed on the first spring, the limiting block is slidingly connected in the fixing ring, the end cross-section of the limiting block and the cross-section of the limiting groove are both right-angled trapezoids, the end of the limiting block is snap-connected in the limiting groove, a traction rope is fixedly connected to the limiting block, and the end of the traction rope is fixedly connected to the connecting ring.

[0010] As a preferred solution of the present invention, the telescopic hoses are distributed at equal angles on the sealing ring, a second spring is fixedly connected inside the telescopic hose, a first air duct is connected to the telescopic hose, two second air ducts are connected to the first air duct, and the two second air ducts are respectively connected to the first rubber airbag and the second rubber airbag, the mounting tubes correspond one to one with the fixing ring, a splicing groove is provided on the mounting tube on one side, and a splicing plate is welded and fixed on the mounting tube on the other side, and the splicing groove and the splicing plate are both annular.

[0011] As a preferred solution of the present invention, wherein: the concentric alignment component includes a receiving groove, the receiving groove is opened in the mounting tube, the mounting tube is rotatably connected to a threaded rod, the threaded rod is threadedly connected to a connecting sleeve rod, a connecting plate is welded and fixed on the connecting sleeve rod, the connecting plate is limitedly slidably connected in the receiving groove, a support rod is hinged on the connecting plate, an adjustment plate is hinged on the support rod, a rotating shaft and a roller are rotatably connected on the adjustment plate, and the rotating shaft is fixedly connected in the receiving groove.

[0012] As a preferred solution of the present invention, the connecting sleeve is connected to the center of the connecting plate, the connecting plate fits the inner wall of the storage groove, the support rods are equidistantly distributed on the connecting plate, and the rollers are equidistantly distributed on the adjustment plate.

[0013] As a preferred solution of the present invention, the adjustment plate is provided with a first slide groove, a through hole and a second slide groove, a slide plate is slidably connected in the second slide groove, a connecting plate is welded and fixed on the slide plate, an insertion rod and a fourth spring are welded and fixed on the connecting plate, the end of the insertion rod is conical, the insertion rod is symmetrically distributed on both sides of the connecting plate, the insertion rod and the roller are alternately distributed, and the insertion rod corresponds to the through hole one by one.

[0014] As a preferred solution of the present invention, wherein: the fourth spring is welded and fixed in the first slide groove, the insertion rod is slidably connected in the through hole, a fixed plate is welded and fixed on the adjustment plate, a third spring is welded and fixed on the fixed plate, a baffle rod is welded and fixed on the third spring, the baffle rod is slidably connected to the fixed plate, the fixed plates are symmetrically distributed on both sides of the second slide groove, and the fixed plates correspond to the baffle rods one by one.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is provided with a concentric alignment component, which utilizes the rotation of the threaded rod, combined with the connecting sleeve rod and the connecting plate, to push the adjustment plate to rotate outward through the support rod. Under the joint action of each adjustment plate, the bottom support and the side support of the directly buried insulated pipe can be simultaneously performed; and by adjusting the rotation angle of each adjustment plate, combined with the roller, the end of the directly buried insulated pipe can be pushed to perform lateral displacement support and longitudinal displacement support in the groove, so that the ends of the two directly buried insulated pipes can be conveniently and stably concentrically aligned, effectively improving the convenience of use of the directly buried insulated pipes; and after the two directly buried insulated pipes are welded to each other, the insertion rod can be pushed into the groove, further improving the installation stability of the directly buried insulated pipes, and at the same time, the support and protection of the welding point can be maintained to avoid deformation or cracking caused by stress on the welding point, thereby increasing the diversity and stability of the use of the directly buried insulated pipes.

[0016] 2. The present invention is provided with a sealing splicing assembly. After the direct-buried insulated pipe is butt-welded, the two mounting tubes are pushed toward the welding point at the same time. Combined with the automatic engagement of the guide groove and the limit block, the welding point can be conveniently and stably covered for protection. At the same time, under the squeezing action of each telescopic hose, the first rubber airbag and the second rubber airbag can be automatically inflated at the same time. Combined with the sealing splicing of the splicing groove and the splicing plate, the multi-level sealing protection of the welding points of the two directly-buried insulated pipes can be conveniently completed, avoiding the contact of the welding points with moisture and air in the outside world, which leads to reduced insulation performance of the directly-buried insulated pipes or even corrosion damage.

[0017] 3. The present invention is provided with a first lap rod and a second lap rod. After the direct-buried insulated pipe is concentrically aligned, under the limiting action of the groove, combined with the card groove and the card rod, the first lap rod and the second lap rod can be easily engaged and fixed with each other, thereby ensuring the stability of the alignment state of the direct-buried insulated pipe, and avoiding the direct-buried insulated pipe to shift or offset during the subsequent welding process, affecting the stability of the subsequent welding work; and under the joint action of each first lap rod and the corresponding second lap rod, the connection stability of the welding point of the two direct-buried insulated pipes can be further improved, avoiding the problem of uneven force on the ends of the two direct-buried insulated pipes resulting in excessive pressure on the welding point, which is prone to cracking and damage, and further improving the use stability of the direct-buried insulated pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them: Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the connection structure of the first lap rod and the second lap rod of the present invention; Figure 3 It is a schematic diagram of the connection structure between the rotating ring and the first bridging rod of the present invention; Figure 4 This is a schematic diagram of the connection structure between the guide rod and the limiting groove of the present invention; Figure 5 This is a schematic diagram of the overall main cross-sectional structure of the present invention; Figure 6 This invention Figure 5 A in the middle is an enlarged structural diagram; Figure 7 This is a schematic diagram of the connection structure between the sealing ring and the telescopic hose of the present invention; Figure 8 This invention Figure 7 The enlarged structural diagram at B in the middle; Figure 9 This is a schematic diagram of the main cross-sectional structure of the telescopic hose of the present invention; Figure 10 is a schematic side view of the structure of the second rubber airbag of the present invention; Figure 11 This is a schematic diagram of the side cross-sectional structure of the mounting tube of the present invention; Figure 12 It is a schematic diagram of the side cross-sectional structure of the adjustment plate of the present invention; Figure 13 This invention Figure 11 The enlarged structural diagram at C in the middle; Figure 14 2. It is a schematic diagram of the top cross-sectional structure of the adjustment plate of the present invention; Figure 15 This is a schematic side view of the reinforcing frame of the present invention; Figure 16 It is a schematic diagram of the connection structure between the card slot and the card rod of the present invention.

[0019] In the figure: 1. working steel pipe; 2. reinforcement frame; 3. outer steel pipe; 4. protective layer; 5. thermal insulation layer; 6. fixing ring; 7. mounting tube; 8. sealing splicing assembly; 801. sealing ring; 802. guide rod; 803. limiting groove; 804. guide groove; 805. first spring; 806. limiting block; 807. traction rope; 808. connecting ring; 809. first sealing groove; 810. second sealing groove; 811. first rubber airbag; 812. second rubber airbag; 813. telescopic hose; 814. second spring; 815. first air guide tube; 816. second air guide tube; 817. splicing groove; 8 18. Splicing plate; 9. Concentric alignment assembly; 901. Storage groove; 902. Threaded rod; 903. Connecting sleeve rod; 904. Connecting plate; 905. Support rod; 906. Adjustment plate; 907. Rotating shaft; 908. Roller; 909. First slide groove; 910. Through hole; 911. Second slide groove; 912. Slide plate; 913. Connecting plate; 914. Insert rod; 915. Fixed plate; 916. Third spring; 917. Stop rod; 918. Fourth spring; 10. Rotating ring; 11. First lap rod; 12. Groove; 13. Card slot; 14. Second lap rod; 15. Fifth spring; 16. Card rod. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing the embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0023] Example To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0024] like Figure 1-16As shown, a direct-buried insulated pipe for a large temperature difference heating unit includes a working steel pipe 1, a reinforcement frame 2 is welded and fixed to the working steel pipe 1, an outer protective steel pipe 3 is welded and fixed to the reinforcement frame 2, a fixing ring 6 is welded and fixed to the outer protective steel pipe 3, a mounting tube 7 is welded and fixed to the fixing ring 6, a sealing splicing assembly 8 is installed on the mounting tube 7, a concentric alignment assembly 9 is installed on the mounting tube 7, the sealing splicing assembly 8 includes a sealing ring 801 and a telescopic hose 813, one end of the telescopic hose 813 is fixedly connected to the sealing ring 801, and the other end of the telescopic hose 813 is fixedly connected to the fixing ring 6, a first sealing groove 809 and a second sealing groove 810 are opened on the mounting tube 7, and the first sealing groove 809 and the second sealing groove 810 are opened on the mounting tube 7. A first rubber airbag 811 is fixedly connected in the groove 809, and a second rubber airbag 812 is fixedly connected in the second sealing groove 810. The concentric alignment component 9 can be used to push the end of the directly buried insulated pipe to perform lateral displacement support and longitudinal displacement support in the groove, so that the ends of the two directly buried insulated pipes can be conveniently and stably concentrically aligned, ensuring the stability and convenience of subsequent welding work; and combined with the sealing splicing component 8, after the directly buried insulated pipes are butt-welded, the multi-level sealing protection of the welding points of the two directly buried insulated pipes can be conveniently completed, avoiding the contact between the welding points and moisture and air in the outside world, resulting in reduced insulation performance of the directly buried insulated pipes or even corrosion damage.

[0025] In this embodiment, the reinforcement frame 2 is "V"-shaped, and there are six groups of reinforcement frames 2. The six groups of reinforcement frames 2 are distributed at equal angles on the working steel pipe 1, and each group of reinforcement frames 2 is equidistantly distributed on the working steel pipe 1. A protective layer 4 is provided on the outer protective steel pipe 3, and the material of the protective layer 4 is high-density polyethylene. An insulation layer 5 is provided inside the outer protective steel pipe 3, and the material of the insulation layer 5 is polyurethane foam. The fixing rings 6 are symmetrically distributed on both sides of the outer protective steel pipe 3. The inner diameter of the outer protective steel pipe 3 is equal to the inner diameter of the fixing ring 6. The fixing ring 6 is rotatably connected to the rotating ring 10 through a bearing. Under the action of each reinforcement frame 2, the overall strength of the direct-buried insulated pipe can be effectively improved, thereby effectively improving the stability and safety of the direct-buried insulated pipe.

[0026] In this embodiment, the fixed ring 6 and the rotating ring 10 correspond one to one, and a first lap rod 11 is welded and fixed on the rotating ring 10 on one side, and a second lap rod 14 is welded and fixed on the rotating ring 10 on the other side. A groove 12 is provided on the first lap rod 11 and the second lap rod 14. The groove 12 on the first lap rod 11 is opposite to the groove 12 on the second lap rod 14. A clamping groove 13 is provided through the first lap rod 11, and a fifth spring 15 is welded and fixed on the second lap rod 14. A clamping rod 16 is welded and fixed on the fifth spring 15, and the clamping rod 16 is slidably connected to the second lap rod 14. After the direct-buried insulated pipe is concentrically aligned, under the limiting action of the groove 12, combined with the clamping groove 13 and the clamping rod 16, the first lap rod 11 and the second lap rod 14 can be easily engaged and fixed to each other, thereby ensuring the stability of the alignment state of the direct-buried insulated pipe, and avoiding the direct-buried insulated pipe from shifting or offsetting during the subsequent welding process, affecting the stability of the subsequent welding work.

[0027] In this embodiment, the sealing ring 801 is welded and fixed on the cylindrical inner wall of the mounting tube 7, the sealing ring 801 is fitted with the protective layer 4, a guide rod 802 is welded and fixed on the sealing ring 801, a limiting groove 803 is provided on the guide rod 802, a guide groove 804 is provided through the fixing ring 6, the guide rod 802 is slidingly connected in the guide groove 804, the guide rods 802 are distributed at equal angles on the sealing ring 801, the guide rods 802 correspond one to one with the guide groove 804, the limiting grooves 803 are equidistantly distributed on the guide rod 802, a first spring 805 is welded and fixed in the fixing ring 6, and a limiting block 803 is welded and fixed on the first spring 805 06, the limit block 806 is slidingly connected in the fixed ring 6, the cross section of the end of the limit block 806 and the cross section of the limit groove 803 are both right-angled trapezoids, the end of the limit block 806 is snap-fitted and connected in the limit groove 803, and a traction rope 807 is fixedly connected to the limit block 806. The traction rope 807 passes through and is slidingly connected to the fixed ring 6 and the sealing ring 801, and the end of the traction rope 807 is fixedly connected to the connecting ring 808. After the direct-buried insulated pipe is butt-welded, by pushing the two mounting tubes 7 to move toward the welding position at the same time, combined with the automatic snap-fitting of the guide groove 804 and the limit block 806, the welding position can be conveniently and stably covered and protected.

[0028] In this embodiment, the telescopic hose 813 is distributed at equal angles on the sealing ring 801. The first sealing groove 809, the second sealing groove 810, the first rubber airbag 811 and the second rubber airbag 812 are all annular. The second spring 814 is fixedly connected to the telescopic hose 813. The telescopic hose 813 is connected to the first air guide tube 815. The first air guide tube 815 is connected to two second air guide tubes 816. The two second air guide tubes 816 are respectively connected to the first rubber airbag 811 and the second rubber airbag 812. The mounting tube 7 Corresponding one to one with the fixing ring 6, a splicing groove 817 is opened on the installation tube 7 on one side, and a splicing plate 818 is welded and fixed on the installation tube 7 on the other side. The splicing groove 817 and the splicing plate 818 are both annular. During the movement of the installation tube 7, each telescopic hose 813 can be automatically squeezed, and then the first rubber airbag 811 and the second rubber airbag 812 can be automatically inflated at the same time. Combined with the sealed splicing of the splicing groove 817 and the splicing plate 818, the multi-level sealing protection of the welding points of the two directly buried insulated pipes can be conveniently completed.

[0029] In this embodiment, the concentric alignment component 9 includes a receiving groove 901, which is provided in the mounting tube 7. A threaded rod 902 is rotatably connected to the mounting tube 7. A connecting sleeve rod 903 is threadedly connected to the threaded rod 902. A connecting plate 904 is welded and fixed to the connecting sleeve rod 903. The connecting plate 904 is slidingly connected in the receiving groove 901. A support rod 905 is hinged on the connecting plate 904. An adjustment plate 906 is hinged on the support rod 905. A rotating shaft 907 and a roller 908 are rotatably connected to the adjustment plate 906. The rotating shaft 907 is fixedly connected to the receiving groove 901. The connecting sleeve rod 903 is connected to the center of the connecting plate 904. The connecting plate 904 and the receiving groove 901 are fixedly connected. The inner walls of the groove 901 are in contact with each other, the support rods 905 are equidistantly distributed on the connecting plate 904, and the rollers 908 are equidistantly distributed on the adjustment plate 906. By utilizing the rotation of the threaded rod 902, combined with the connecting sleeve rod 903 and the connecting plate 904, the adjustment plate 906 can be pushed to rotate outward through the support rod 905. Under the joint action of each adjustment plate 906, the bottom support and side support of the direct-buried insulated pipe can be performed at the same time; and by adjusting the rotation angle of each adjustment plate 906, combined with the roller 908, the end of the direct-buried insulated pipe can be pushed to perform lateral displacement support and longitudinal displacement support in the groove, so that the ends of the two direct-buried insulated pipes can be conveniently and stably concentrically aligned.

[0030] In this embodiment, a first slide groove 909, a through hole 910 and a second slide groove 911 are provided in the adjustment plate 906. The first slide groove 909, the through hole 910 and the second slide groove 911 are connected. A slide plate 912 is slidably connected in the second slide groove 911. A connecting plate 913 is welded and fixed on the slide plate 912. A plug rod 914 and a fourth spring 918 are welded and fixed on the connecting plate 913. The end of the plug rod 914 is tapered. The plug rod 914 is symmetrically distributed on both sides of the connecting plate 913. The plug rod 914 and the roller 908 are alternately distributed. The plug rod 914 corresponds to the through hole 910 one by one. The fourth spring 918 is welded and fixed in the first slide groove 909. The rod 914 is slidably connected in the through hole 910, and a fixing plate 915 is welded and fixed on the adjustment plate 906, and a third spring 916 is welded and fixed on the fixing plate 915, and a blocking rod 917 is welded and fixed on the third spring 916. The blocking rod 917 passes through and is slidably connected to the fixing plate 915, and the fixing plates 915 are symmetrically distributed on both sides of the second slide groove 911. The fixing plates 915 and the blocking rods 917 correspond one to one. After the two directly buried insulated pipes are welded to each other, the insertion rod 914 can be pushed into the groove, which further improves the installation stability of the directly buried insulated pipes, and at the same time can maintain support and protection for the welding points, and avoid deformation or cracking caused by stress on the welding points.

[0031] It should be noted that the present invention is a direct-buried insulated pipe for a large temperature difference heating unit. First, two direct-buried insulated pipes are hoisted into the groove by a hoisting device, and then the threaded rod 902 on the mounting tube 7 is rotated. Under the rotation of the threaded rod 902, the connecting sleeve rod 903 connected by a thread can push the connecting plate 904 to move in the direction of the rotating shaft 907. Under the movement of the connecting plate 904, combined with each hinged support rod 905, the adjusting plate 906 on the rotating shaft 907 can be pushed to rotate outward stably. Under the rotation of the adjusting plate 906, each roller 908 can be driven to contact the groove; under the rotation of the bottom adjusting plate 906, the direct-buried insulated pipe can be lifted by using each roller 908, and the side adjusting plate 906 can be lifted by using each roller 908. 06, can drive each roller 908 to contact the inner side end face of the groove; and by adjusting the rotation angle of the bottom adjustment plate 906, can conveniently adjust the lifting height of the direct-buried insulated pipe, similarly, by adjusting the rotation angle of the side adjustment plate 906, can push the direct-buried insulated pipe to perform lateral displacement in the groove; through the same operation, another direct-buried insulated pipe can also perform lateral displacement and longitudinal displacement in the groove. In summary, by adjusting the rotation angle of each adjustment plate 906, combined with the roller 908, can push the end of the directly buried insulated pipe to perform lateral displacement support and longitudinal displacement support in the groove, can make the working steel pipe 1 ends of the two directly buried insulated pipes fit each other, and conveniently and stably achieve concentric alignment.

[0032] After the ends of the two directly buried insulated pipes are concentrically aligned, the rotating ring 10 on the fixed ring 6 can be rotated. By rotating the rotating ring 10, the first lap rods 11 at the end of one directly buried insulated pipe can be driven to move to the second lap rod 14 at the end of the other directly buried insulated pipe. At this time, the staff only needs to pull the clamping rod 16 on the second lap rod 14 and align and fit the groove 12 on the first lap rod 11 with the groove 12 on the second lap rod 14. Then, the clamping rod 16 can be released. At this time, the fifth spring 15 Under the action of elasticity, the clamping rod 16 on the second lap rod 14 can be driven to automatically engage with the clamping groove 13 on the first lap rod 11, completing the mutual overlap and fixation of the two directly buried insulated pipes after concentric alignment, thereby ensuring the stability of the alignment state of the directly buried insulated pipes, and avoiding the direct buried insulated pipes from shifting or offsetting during the subsequent welding process, affecting the stability of the subsequent welding work; and under the joint action of each first lap rod 11 and the corresponding second lap rod 14, the connection stability of the welding points of the two directly buried insulated pipes can be further improved.

[0033] After the ends of the two directly buried insulated pipes are overlapped and fixed, the staff can weld the directly buried insulated pipes. During the welding process, the first overlapping rod 11 and the corresponding second overlapping rod 14 can be rotated by toggling the rotating ring 10 to avoid affecting the stability of subsequent welding work; after the welding is completed, the insulation layer 5 can be filled at the welding place of the working steel pipe 1. After the filling is completed, the staff can push the installation tubes 7 on the fixing rings 6 on both sides to move toward the middle welding direction at the same time until the two installation tubes 7 fit each other and complete the splicing; and during the movement of the two installation tubes 7, they can drive the guide on the sealing ring 801 The rod 802 moves synchronously, and then the limit block 806 can be pushed to automatically move toward the inside of the fixing ring 6 through the mutual fit between the inclined surface of the limit groove 803 and the inclined surface of the limit block 806, and the limit block 806 will not block the movement of the guide rod 802; when the two mounting tubes 7 fit together and the splicing is completed, the limit block 806 can automatically engage into the adjacent limit groove 803 under the elastic action of the first spring 805. At this time, under the blocking action of the internal plane of the limit groove 803 and the end plane of the limit block 806, combined with the sealing ring 801 and the guide rod 802, the mounting tube 7 can be automatically engaged and fixed.

[0034] When the two mounting tubes 7 are spliced together, the splicing plate 818 on one mounting tube 7 can be stably inserted into the splicing groove 817 on the other mounting tube 7, and during the movement of the mounting tube 7, the sealing ring 801 can simultaneously squeeze each telescopic hose 813. At this time, after being squeezed, the air in the telescopic hose 813 can pass through the first air guide tube 815 and the second air guide tube 816 to automatically inflate the first rubber airbag 811 in the first sealing groove 809 and the second rubber airbag 812 in the second sealing groove 810. Combined with the sealed splicing of the splicing groove 817 and the splicing plate 818, the multi-level sealing protection of the welding joints of the two directly buried insulated pipes can be conveniently completed to prevent the welding joints from contacting with moisture and air in the outside world, which will cause the thermal insulation performance of the directly buried insulated pipes to be reduced or even corroded.

[0035] After completing the docking of the two directly buried insulated pipes, the staff can push the blocking rods 917 on both sides of the second slide groove 911, and at the same time use the slide plate 912 to move the plug rod 914 on the connecting plate 913 toward the through hole 910. At this time, under the limiting action of the first slide groove 909 and the second slide groove 911, the plug rod 914 can pass through the through hole 910 and be stably inserted into the groove, and the slide plate 912 can move to the other side of the blocking rod 917. Then the blocking rod 917 can be released. At this time, under the elastic action of the third spring 916, the blocking rods 917 on the fixing plates 915 on both sides can be driven to move to the middle and reset at the same time, thereby It can block the slide plate 912 to prevent the elastic action of the fourth spring 918 from driving the insertion rod 914 on the connecting plate 913 to move and reset, thereby ensuring the stability of the working state of the insertion rod 914, further improving the installation stability of the direct-buried insulated pipe, and at the same time maintaining support and protection for the welding joints; when it is necessary to inspect and maintain the welding joints of the two direct-buried insulated pipes, it is only necessary to pull the limit block 806 through the traction rope 807 on the connecting ring 808 to make it move out of the limit groove 803, so as to complete the splitting between the two installation tubes 7, and then the welding joints of the two direct-buried insulated pipes can be inspected and maintained.

[0036] Although the present invention has been described above with reference to embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as there are no structural conflicts, the various features of the embodiments disclosed herein may be combined with each other in any manner, and the omission of an exhaustive description of such combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A directly buried insulated pipe for a large temperature difference heating unit, comprising a working steel pipe (1), characterized in that: A reinforcement frame (2) is welded and fixed to the working steel pipe (1), an outer protective steel pipe (3) is welded and fixed to the reinforcement frame (2), a fixing ring (6) is welded and fixed to the outer protective steel pipe (3), a mounting tube (7) is welded and fixed to the mounting ring (6), a sealing splicing assembly (8) is mounted on the mounting tube (7), a concentric alignment assembly (9) is mounted on the mounting tube (7), the sealing splicing assembly (8) comprises a sealing ring (801) and a telescopic hose (813), one end of the telescopic hose (813) is fixedly connected to the sealing ring (801), and the other end of the telescopic hose (813) is fixedly connected to the fixing ring (6), a first sealing groove (809) and a second sealing groove (810) are provided on the mounting tube (7), a first rubber airbag (811) is fixedly connected in the first sealing groove (809), and a second rubber airbag (812) is fixedly connected in the second sealing groove (810).

2. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 1, characterized in that: The reinforcing frame (2) is in a "V" shape. Six groups of reinforcing frames (2) are provided. The six groups of reinforcing frames (2) are distributed on the working steel pipe (1) at equal angles. Each group of reinforcing frames (2) is distributed on the working steel pipe (1) at equal intervals. A protective layer (4) is provided on the outer protective steel pipe (3). The material of the protective layer (4) is high-density polyethylene. An insulating layer (5) is provided inside the outer protective steel pipe (3). The material of the insulating layer (5) is polyurethane foam. The fixing rings (6) are symmetrically distributed on both sides of the outer protective steel pipe (3). The inner diameter of the outer protective steel pipe (3) is equal to the inner diameter of the fixing ring (6). The fixing ring (6) is rotatably connected to the rotating ring (10) through a bearing.

3. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 2, characterized in that: The fixed ring (6) and the rotating ring (10) correspond to each other one to one. A first connecting rod (11) is welded and fixed on the rotating ring (10) on one side, and a second connecting rod (14) is welded and fixed on the rotating ring (10) on the other side. A clamping groove (13) is provided through the first connecting rod (11). A fifth spring (15) is welded and fixed on the second connecting rod (14). A clamping rod (16) is welded and fixed on the fifth spring (15). The clamping rod (16) is slidably connected to the second connecting rod (14).

4. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 3, characterized in that: The sealing ring (801) is welded and fixed on the mounting tube (7), the sealing ring (801) is in contact with the protective layer (4), a guide rod (802) is welded and fixed on the sealing ring (801), a limiting groove (803) is provided on the guide rod (802), a guide groove (804) is provided through the fixing ring (6), the guide rod (802) is slidingly connected in the guide groove (804), the guide rods (802) are distributed at equal angles on the sealing ring (801), the guide rods (802) correspond to the guide grooves (804) one by one, and the limiting grooves (803) are distributed at equal intervals on the guide rod (802).

5. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 4, characterized in that: A first spring (805) is welded and fixed in the fixing ring (6), a limiting block (806) is welded and fixed on the first spring (805), the limiting block (806) is slidingly connected in the fixing ring (6), the cross section of the end of the limiting block (806) and the cross section of the limiting groove (803) are both right-angled trapezoidal, the end of the limiting block (806) is snap-connected in the limiting groove (803), a traction rope (807) is fixedly connected to the limiting block (806), and the end of the traction rope (807) is fixedly connected to a connecting ring (808).

6. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 5, characterized in that: The telescopic hose (813) is distributed at equal angles on the sealing ring (801). A second spring (814) is fixedly connected inside the telescopic hose (813). A first air guide tube (815) is connected to the telescopic hose (813). Two second air guide tubes (816) are connected to the first air guide tube (815). The two second air guide tubes (816) are respectively connected to the first rubber airbag (811) and the second rubber airbag (812). The mounting tube (7) corresponds to the fixing ring (6) one by one. A splicing groove (817) is provided on the mounting tube (7) on one side, and a splicing plate (818) is welded and fixed to the mounting tube (7) on the other side. The splicing groove (817) and the splicing plate (818) are both annular.

7. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 6, characterized in that: The concentric alignment component (9) comprises a receiving groove (901), the receiving groove (901) is provided in the installation tube (7), a threaded rod (902) is rotatably connected to the installation tube (7), a connecting sleeve rod (903) is threadedly connected to the threaded rod (902), a connecting plate (904) is welded and fixed to the connecting sleeve rod (903), the connecting plate (904) is limitedly slidably connected in the receiving groove (901), a support rod (905) is hingedly connected to the connecting plate (904), an adjustment plate (906) is hingedly connected to the support rod (905), a rotating shaft (907) and a roller (908) are rotatably connected to the adjustment plate (906), and the rotating shaft (907) is fixedly connected in the receiving groove (901).

8. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 7, characterized in that: The connecting sleeve rod (903) is connected to the center of the connecting plate (904), the connecting plate (904) is in contact with the inner wall of the receiving groove (901), the supporting rods (905) are equidistantly distributed on the connecting plate (904), and the rollers (908) are equidistantly distributed on the adjusting plate (906).

9. The direct-buried insulated pipe for a large temperature difference heating unit according to claim 8, characterized in that: The regulating plate (906) is provided with a first slide groove (909), a through hole (910) and a second slide groove (911); a slide plate (912) is slidably connected in the second slide groove (911); a connecting plate (913) is welded and fixed on the slide plate (912); an insert rod (914) and a fourth spring (918) are welded and fixed on the connecting plate (913); the end of the insert rod (914) is conical; the insert rod (914) is symmetrically distributed on both sides of the connecting plate (913); the insert rod (914) and the roller (908) are alternately distributed; the insert rod (914) and the through hole (910) correspond one to one.

10. The directly buried insulated pipe for a large temperature difference heating unit according to claim 9, characterized in that: The fourth spring (918) is welded and fixed in the first slide groove (909), the insertion rod (914) is slidably connected in the through hole (910), a fixed plate (915) is welded and fixed on the adjustment plate (906), a third spring (916) is welded and fixed on the fixed plate (915), a blocking rod (917) is welded and fixed on the third spring (916), the blocking rod (917) is slidably connected to the fixed plate (915), the fixed plates (915) are symmetrically distributed on both sides of the second slide groove (911), and the fixed plates (915) correspond one to one with the blocking rod (917).

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