Energy-saving split assembled sectional type buried pipe coaxial heat exchanger

Abstract

The utility model belongs to the technical field of geothermal energy utilization, and relates to an energy-saving split assemblable sectional type buried pipe coaxial heat exchanger, which is characterized in that an upper adapting pipe and a lower adapting pipe are arranged at the up-and-down communication part of a heat exchange buried pipe, the upper adapting pipe and the lower adapting pipe are in coaxial butt joint and up-and-down communication, an upper sealing ring is arranged at the pipe orifice of the upper adapting pipe, and a lower sealing ring is arranged at the pipe orifice of the lower adapting pipe; an upper sealing ring is arranged at the opening of the upper adapting pipe, a lower sealing ring is arranged at the opening of the lower adapting pipe, the upper sealing ring and the lower sealing ring are both made of elastic materials, and the inner ring of the upper sealing ring and the inner ring of the lower sealing ring are both coated with hydrophobic materials; a blocking head extending downwards in the axial direction is arranged on the outer circumference of a pipe opening of the upper adapting pipe, the blocking head extends out of the end face of the pipe opening of the upper adapting pipe, and a via hole is formed in the blocking head in the radial direction. Screw holes are formed in the outer circumference of the lower adapting pipe in the radial direction, and the hole positions of the screw holes are matched with the hole positions of the via holes. According to the utility model, socket type connection is adopted, so that rapid assembly and disassembly are realized, the construction difficulty and time are reduced, the requirements on skills of workers are reduced, and the construction efficiency and quality are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to geothermal energy utilization technical field relates to a kind of energy-saving split can be assembled sectional type buried pipe coaxial heat exchanger. BACKGROUND

[0002] Geothermal energy is a renewable energy source from the interior of the earth, due to its renewable and environmental zero-pollution characteristics, and is not easily affected by seasonal changes, has been widely popularized and applied. The middle-deep geothermal "heat extraction without water" technology is a geothermal well engineering that does not affect groundwater resources. This technology extracts geothermal energy from high-temperature rock mass at a depth of 2000-3000 meters by drilling a hole and installing a buried pipe heat exchange device, and then provides heat for buildings through high-temperature heat pump technology. Unlike conventional water-heat type geothermal wells, this technology has two main modes: single-well coaxial pipe closed heat exchange technology and U-shaped butt joint well heat exchange technology. These technologies perform the functions of heating and providing hot water for living in many practical engineering projects. In recent years, the middle-deep buried pipe geothermal heating system has been widely used in practical engineering, and the length of the heat exchanger can reach 3000 meters.

[0003] The core component of the middle-deep buried pipe geothermal heating system is the middle-deep buried pipe heat exchanger, which is deeply buried underground and can be several kilometers long. Due to the geothermal gradient and multi-layer geothermal physical parameters of the underground rock-soil mass, the heat exchange process is relatively complex. During the heat exchange process, the thermal conductivity of the inner pipe is crucial, not only affecting the heat exchange efficiency, but also being a key indicator when selecting pipe materials. Generally, the better the heat preservation of the inner pipe, the lower the thermal conductivity of the pipe material. In addition, the relevant parameters of the inner pipe include the inner pipe diameter and the pipe wall thickness.

[0004] However, the existing buried pipe butt joint has the following disadvantages:

[0005] Complexity of hot melt connection: hot melt connection operation requires skilled workers to operate, and once the connection is completed, it cannot be easily disassembled. The socket connection has the advantages of quick installation and easy disassembly, and the sealing ring combined with the hydrophobic material can effectively ensure the sealing.

[0006] Error of temperature measurement optical fiber: in the practical application of middle-deep buried pipe heat exchanger, in order to accurately detect the operation data, temperature measurement optical fiber is usually buried to obtain the temperature change along the pipe diameter. However, if the optical fiber is displaced or attached to the pipe wall during temperature measurement, measurement error may occur.

[0007] Therefore, there is an urgent need for a buried pipe butt joint device that is simpler, more convenient and reliable, low-cost, and has lower operation requirements to solve this technical problem. SUMMARY

[0008] The technical scheme adopted by the utility model for solving the technical problems is: an energy-saving split-mountable sectional buried pipe coaxial heat exchanger, the buried pipe coaxial heat exchanger is composed of a plurality of heat exchange buried pipes which are sequentially connected at the head and tail, an upper adapter pipe and a lower adapter pipe are arranged at the head and tail of the heat exchange buried pipe, the upper adapter pipe is arranged at the lower end of the previous heat exchange buried pipe, the lower adapter pipe is arranged at the upper end of the next heat exchange buried pipe, the upper adapter pipe and the lower adapter pipe are coaxially connected and communicated in an up-down manner;

[0009] A upper sealing ring is arranged at the pipe opening of the upper adapter pipe, and a lower sealing ring is arranged at the pipe opening of the lower adapter pipe, the upper sealing ring and the lower sealing ring are made of elastic material, and the inner ring of the upper sealing ring and the inner ring of the lower sealing ring are coated with a hydrophobic material;

[0010] A stop head extending downward along the axial direction is arranged on the outer circumference of the pipe opening of the upper adapter pipe, the stop head extends out of the pipe opening end surface of the upper adapter pipe, and a through hole is arranged on the stop head along the radial direction;

[0011] A screw hole is arranged on the outer circumference of the lower adapter pipe along the radial direction, and the hole position of the screw hole matches the hole position of the through hole;

[0012] When the upper adapter pipe is installed on the lower adapter pipe in an up-down butt joint manner, the upper sealing ring is tightly pressed on the lower sealing ring, the stop head is protected on the outer circumference of the lower adapter pipe from top to bottom, the through hole is radially opposite to the screw hole from outside to inside, a screw is arranged in the through hole, and the screw is threadedly connected with the screw hole.

[0013] Preferably, a fiber groove parallel to the axial direction is arranged on the screw cap of the screw, and a fiber is clamped in the fiber groove.

[0014] Preferably, the stop head is in a circular ring shape, at least three through holes are arranged on the ring circumference of the stop head, and the through holes are uniformly distributed on the ring circumference; when the upper adapter pipe is installed on the lower adapter pipe in an up-down butt joint manner, the stop head is sleeved on the outer circumference of the lower adapter pipe.

[0015] Preferably, a buckle is arranged at the end of the stop head, and a clamping table is arranged on the pipe wall of the lower adapter pipe; when the screw is threadedly connected with the screw hole, the buckle is clamped and fixed at the clamping table.

[0016] Preferably, an annular protrusion protruding downward along the axial direction is arranged on the lower bottom surface of the inner ring of the upper sealing ring, and an annular groove recessed downward along the axial direction is arranged on the upper bottom surface of the inner ring of the lower sealing ring, and the protrusion and the groove are engaged and matched in an up-down manner.

[0017] More preferably, the outer circumference of the protrusion is provided with a taper with a large upper part and a small lower part, the inner circumferential wall of the groove is provided with a taper with a large upper part and a small lower part, and the taper of the protrusion is not less than the taper of the groove.

[0018] Preferably, the upper adapter pipe is arranged at the lower end of the upper heat exchange pipe by hot melt connection, bonding, welding or integrated manufacturing, and the lower adapter pipe is arranged at the upper end of the lower heat exchange pipe by hot melt connection, bonding, welding or integrated manufacturing.

[0019] The utility model discloses the beneficial effects are:

[0020] 1、 compared with the hot melt connection of prior art, the utility model discloses the socket joint, realizes quick assembly and disassembly, reduces construction difficulty and time, reduces the requirement to worker's skill, improves construction efficiency and quality.

[0021] 2、 the heat exchanger of the utility model is designed as sectional modular structure, so that the heat exchanger can be flexibly adjusted according to actual engineering demand.

[0022] 3、 the utility model discloses the sealing ring of hydrophobic material ensures the sealing property of interface, prevents fluid leakage, improves the safety and reliability of system.

[0023] 4、 the utility model discloses the prearrangement fiber slot on buckle, fixes the position of temperature measuring optical fiber, prevents its displacement in the operation process, avoids measurement error. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the front view sectional view of the energy-saving split mountable sectional pipe-in-pipe heat exchanger of the utility model;

[0025] Figure 2 is Figure 1 The utility model discloses the A towards local amplification diagram;

[0026] Figure 3 is the screw part drawing of the utility model.

[0027] 1, upper adapter pipe;2, lower adapter pipe;3, upper sealing ring;4, lower sealing ring;5, stop head;6, via hole;7, screw hole;8, screw;9, optical fiber slot;10, optical fiber;11, buckle;12, card station;13, boss;14, recess. DETAILED DESCRIPTION

[0028] The related technologies in the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] Reference Figures 1 to 3 The utility model discloses an energy -conserving split can be assembled sectional type ground -buried pipe coaxial heat exchanger, and the ground -buried pipe coaxial heat exchanger is composed of the first and last communication of the heat exchange ground -buried pipe in order, the first and last communication of the heat exchange ground -buried pipe is equipped with upper adapter pipe 1, lower adapter pipe 2, upper adapter pipe 1 sets up in the lower end of the heat exchange ground -buried pipe of last section, and lower adapter pipe 2 sets up in the upper end of the heat exchange ground -buried pipe of next section, and upper adapter pipe 1 and lower adapter pipe 2 are coaxially butted and communicate up and down, upper adapter pipe 1, lower adapter pipe 2 are designed as modularization, so that the heat exchanger can be segmented according to actual demand Assembly improves the flexibility and convenience of installation significantly.

[0030] The pipe orifice of upper adapter pipe 1 is equipped with upper sealing ring 3, and the pipe orifice of lower adapter pipe 2 is equipped with lower sealing ring 4, and upper sealing ring 3 and lower sealing ring 4 are all made of elastic material, and the inner circle of upper sealing ring 3 and the inner circle of lower sealing ring 4 are coated with hydrophobic material, and the entire upper sealing ring 3 and lower sealing ring 4 can be coated with hydrophobic material or made of material that is both elastic and hydrophobic, thereby ensuring that the fluid flow in the heat exchanger does not escape, ensuring the sealing of the interface and preventing fluid leakage. Hydrophobic materials have high temperature resistance, corrosion resistance and other characteristics, ensuring the long-term performance of the sealing ring in harsh environments. The design of the sealing ring also takes into account the interface matching between materials with different thermal expansion coefficients, further improving the sealing effect.

[0031] The outer circumference of the pipe orifice of upper adapter pipe 1 is provided with a stop head 5 extending downward along the axial direction, the stop head 5 extends beyond the pipe orifice end surface of upper adapter pipe 1, and a through hole 6 is provided on the stop head 5 along the radial direction.

[0032] A threaded hole 7 is provided on the outer circumference of lower adapter pipe 2 along the radial direction, and the hole position of threaded hole 7 matches the hole position of through hole 6.

[0033] When the upper adapter pipe 1 is installed on the lower adapter pipe 2 in an upper and lower butt joint manner, the upper sealing ring 3 is tightly attached to the lower sealing ring 4, the head 5 is protected on the outer circumference of the lower adapter pipe 2 from top to bottom, the through hole 6 is radially opposite to the screw hole 7 from outside to inside, the screw 8 is arranged in the through hole 6, and the screw 8 is threadedly connected with the screw hole 7. The screw and screw hole connection can realize quick assembly and disassembly. Compared with the traditional hot melting connection, the socket connection mode cooperated with the screw and screw hole connection does not require professional skills, and ordinary workers can complete the installation, thereby greatly improving the construction efficiency. Meanwhile, the socket connection and the screw and screw hole connection can be quickly disassembled when needed, thereby facilitating system maintenance and partial replacement.

[0034] Further, the screw cap of the screw 8 is provided with an optical fiber groove 9 parallel to the axial direction, and an optical fiber 10 is clamped in the optical fiber groove 9. The optical fiber groove 9 can be rotationally connected at the root of the screw cap or directly opened on the screw cap. When the screw 8 is threadedly connected with the screw hole 7, the optical fiber groove 9 can be vertically guaranteed when the screw 8 is tightened. The optical fiber groove 9 can fix the position of the temperature measuring optical fiber, avoid displacement of the temperature measuring optical fiber 10, effectively prevent displacement or adhesion of the temperature measuring optical fiber 10 in the running process, and avoid measurement error. In addition, the optical fiber groove 9 is further provided with a flexible material gasket, which further protects the optical fiber 10 and reduces vibration and abrasion.

[0035] Further, the head 5 is in a circular ring shape, at least three through holes 6 are arranged on the ring circumference of the head 5, and the through holes 6 are uniformly distributed. When the upper adapter pipe 1 is installed on the lower adapter pipe 2 in an upper and lower butt joint manner, the head 5 is arranged on the outer circumference of the lower adapter pipe 2. The annular head 5 is used for closing and protecting the end of the pipeline, preventing external substances from entering the inside of the pipeline, and ensuring the airtightness and safety of the system. The head 5 is made of a corrosion-resistant and high-temperature-resistant composite material and is suitable for various complex underground environments. The head 5 is designed to be easily installed and disassembled, facilitating later inspection and maintenance.

[0036] Further, the end of the head 5 is provided with a buckle 11, and the pipe wall of the lower adapter pipe 2 is provided with a clamping table 12. When the screw 8 is threadedly connected with the screw hole 7, the buckle 11 is clamped and fixed at the clamping table 12. The buckle 11 cooperates with the clamping table 12 to ensure the connection rigidity of the connection between the upper adapter pipe 1 and the lower adapter pipe 2 and also ensure the sealing property of the connection, thereby preventing external foreign matters from entering the interface of the pipeline through the end of the head 5.

[0037] Further, the inner ring lower bottom surface of the upper sealing ring 3 is provided with an annular boss 13 protruding downward along the axial direction, the inner ring upper bottom surface of the lower sealing ring 4 is provided with an annular groove 14 recessed downward along the axial direction, and the boss 13 is matched with the groove 14 in an upper and lower engagement manner. The cooperation between the boss 13 and the groove 14 ensures the sealing property of the interface of the pipeline and also prevents the fluid in the heat exchanger from escaping outward.

[0038] Further, the outer circumference of the convex boss 13 is provided with a tapering from large to small from top to bottom, the inner circumferential wall of the groove 14 is provided with a tapering from large to small from top to bottom, the tapering of the convex boss 13 is not less than the tapering of the groove 14; the tapering of the convex boss 13 is large and the tapering of the groove 14 is small, so that when the convex boss 13 engages and presses the groove 14 downward, the pressing is tighter and the sealing is better.

[0039] Further, the upper connecting pipe 1 is arranged at the lower end of the upper heat exchange buried pipe in a manner of hot melt connection, bonding, welding or integrated manufacturing, and the lower connecting pipe 2 is arranged at the upper end of the lower heat exchange buried pipe in a manner of hot melt connection, bonding, welding or integrated manufacturing; the connecting pipe can be arranged at the two ends of the buried pipe according to the requirement, different connecting modes have different advantages, and the multiple connecting modes facilitate the construction personnel to cut the buried pipe into different lengths according to the requirement, select the appropriate connecting mode according to the site condition or transportation condition, and therefore have wider applicability.

[0040] In conclusion, the utility model adopts the socket joint, realizes the quick assembly and disassembly, reduces the construction difficulty and time, reduces the requirement for the worker skill, improves the construction efficiency and quality, reduces the downtime and maintenance cost, improves the adaptability and economy of the system, and therefore has wide application prospect.

[0041] It should be emphasized that: the above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification, equivalent change and modification according to the technical essence of the utility model are still within the scope of the utility model technical scheme.

Claims

1. An energy-saving split-mountable segmental pipe-in-pipe coaxial heat exchanger, characterized in that, The buried pipe coaxial heat exchanger is composed of multiple heat exchange buried pipes which are sequentially connected in a head-to-tail manner, and upper and lower connecting pipes are arranged at the head-to-tail connection positions of the heat exchange buried pipes. The upper connecting pipe is arranged at the lower end of the upper heat exchange buried pipe, and the lower connecting pipe is arranged at the upper end of the lower heat exchange buried pipe. The upper connecting pipe is coaxially connected with the lower connecting pipe in an upper-lower connection manner. The upper connecting pipe is provided with an upper sealing ring at the pipe opening, and the lower connecting pipe is provided with a lower sealing ring at the pipe opening. The upper and lower sealing rings are made of elastic material, and the inner ring of the upper sealing ring and the inner ring of the lower sealing ring are coated with a hydrophobic material.

2. The energy saving split-mountable sectional in-coax heat exchanger according to claim 1, characterized in that, The outer circumference of the upper connecting pipe is provided with a blocking head which extends downward along the axial direction.

3. The energy saving split-mountable sectional in-coax heat exchanger according to claim 1, wherein, The outer circumference of the lower connecting pipe is provided with a screw hole which is matched with the hole position of the through hole.

4. The energy saving split-mountable sectional in-coax heat exchanger according to claim 1, wherein, When the upper connecting pipe is installed on the lower connecting pipe in an upper-lower connection manner, the upper sealing ring is tightly pressed on the lower sealing ring, the blocking head is arranged on the outer circumference of the lower connecting pipe from top to bottom, the through hole is radially opposite to the screw hole from outside to inside, and the screw is arranged in the through hole and is screwed with the screw hole.

5. The energy saving split-mountable sectional in-ground pipe coaxial heat exchanger according to claim 1, characterized in that, The screw cap of the screw is provided with a fiber groove which is parallel to the axial direction, and the fiber groove is clamped with a fiber.

6. The energy saving split-mountable sectional pipe-in-pipe in-ground heat exchanger according to claim 5, characterized in that, The blocking head is annular, and at least three through holes are arranged on the annular circumference of the blocking head.

7. The energy saving split-mountable sectional in-line heat exchanger according to claim 1, wherein, The end of the blocking head is provided with a buckle, and the pipe wall of the lower connecting pipe is provided with a clamping table. The inner ring of the upper sealing ring is provided with a downward protruding annular boss, and the inner ring of the lower sealing ring is provided with a downward recessed annular groove. The outer circumference of the boss is provided with an upper-large-lower-small taper, and the inner circumferential wall of the groove is provided with an upper-large-lower-small taper. The taper of the boss is not less than the taper of the groove. The upper connecting pipe is arranged at the lower end of the upper heat exchange buried pipe in a hot melt connection, bonding, welding or integrated manufacturing manner. The lower connecting pipe is arranged at the upper end of the lower heat exchange buried pipe in a hot melt connection, bonding, welding or integrated manufacturing manner.

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