Ground heat exchanger

Abstract

The utility model relates to the technical field of ground source heat pump especially relates to a buried pipe heat exchanger, the utility model provides a buried pipe heat exchanger, including joint, many water inlet pipes and water outlet pipes, the inside of joint is provided with cavity, and the top center position of joint is provided with the bearing part of cooperation with the top rod, many water inlet pipes are communicated with the top of joint, the water outlet pipe is communicated with the top of joint, wherein, many water inlet pipes and water outlet pipes are communicated through the cavity, the utility model provides a buried pipe heat exchanger to increase the heat exchange area under the condition of keeping the borehole aperture unchanged, improve the heat exchange efficiency, and the problem of jamming or installation failure in the installation and lowering process is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of ground source heat pumps, and in particular to a buried pipe heat exchanger. Background Technology

[0002] A ground source heat pump system is a highly efficient and energy-saving technology that utilizes shallow geothermal resources for heating and cooling. It exchanges heat with the underground soil through buried pipe heat exchangers to provide heating and cooling for buildings. As the core component of a ground source heat pump system, the heat exchange efficiency of the buried pipe heat exchanger directly affects the performance and economy of the entire system.

[0003] Currently, buried pipe heat exchangers commonly employ a U-tube structure. One end of the U-tube is for water inlet, and the other end is for water outlet, connected by a bend at the bottom. In practical engineering, two U-tubes are typically installed in a heat exchange well to increase the heat exchange area. However, this U-tube structure presents the following technical problems: Because the bend at the bottom of the U-tube occupies a significant amount of space, the number of U-tubes within a fixed-diameter borehole is limited, preventing further increases in heat exchange area. When more U-tubes are needed, the borehole diameter must be increased, significantly increasing drilling costs. Under corresponding geological conditions, the heat exchange capacity per unit of heat exchange well is essentially fixed, resulting in low heat exchange efficiency and necessitating a greater number of boreholes to meet the system's heat exchange requirements. Secondly, engineering costs and land occupation are serious issues. Due to the limitation of single-well heat exchange efficiency, ground source heat pump projects often require a large number of boreholes, which occupy a large area, increasing land use costs. Simultaneously, the increased number of boreholes directly leads to a substantial increase in drilling costs and initial construction costs, hindering the widespread application of ground source heat pump technology. Furthermore, existing buried pipe heat exchangers present installation difficulties. When lowering the U-shaped pipe structure into deep wells, the lack of a clear stress point and stable installation interface often leads installers to rely on water injection inside the pipe and its own weight for lowering. This method is prone to causing blockages, deformation, joint damage, or installation failure during the lowering process. This is particularly problematic in deep boreholes, where installation controllability is poor and the success rate is low. Utility Model Content

[0004] This utility model provides a buried pipe heat exchanger that increases the heat exchange area and improves the heat exchange efficiency while keeping the borehole diameter unchanged. It also solves the problem of jamming or installation failure during the installation and lowering process.

[0005] This utility model provides a buried pipe heat exchanger, comprising: a connector, the interior of which is provided with a cavity, and a bearing part that cooperates with a top rod is provided at the center of the top of the connector; multiple water inlet pipes communicating with the top of the connector; and a water outlet pipe communicating with the top of the connector; wherein the multiple water inlet pipes and the water outlet pipe are connected through the cavity.

[0006] In one possible implementation, multiple inlet and outlet pipes are arranged around the support structure.

[0007] In one possible implementation, the diameter of the inlet pipe is smaller than the diameter of the outlet pipe.

[0008] In one possible implementation, there are 3-6 inlet pipes with a diameter of De20-De32; and the outlet pipe has a diameter of De32-De50.

[0009] In one possible implementation, the support portion is provided with a groove that mates with the push rod.

[0010] In one possible implementation, the connector includes: a cone; a cylinder, the bottom of which is an open structure connected to the top of the cone, and the cylinder and the cone forming a cavity; wherein, the inlet pipe and the outlet pipe are respectively connected to the top of the cylinder, and the bearing part is disposed at the top of the cylinder.

[0011] In one possible implementation, a support column is arranged axially inside the cavity, with its top connected to the load-bearing part and its bottom abutting against the top of the cone.

[0012] In one possible implementation, the bottom of the cylinder is provided with a first threaded portion, and the top of the cone is provided with a second threaded portion, the first threaded portion and the second threaded portion being connected by threads; the buried pipe heat exchanger also includes: a sealing element, disposed between the cylinder and the cone, for sealing the connection between the cylinder and the cone; and a limiting pin, which passes radially through the first threaded portion and the second threaded portion, for locking the cylinder and the cone.

[0013] In one possible implementation, the top of the cone is provided with a guide groove facing the inlet and outlet pipes.

[0014] In one possible implementation, a baffle plate is provided inside the cavity, which divides the cavity into multiple flow channels. The input ends of the multiple flow channels are connected to multiple water inlet pipes, and the output ends of the multiple flow channels are connected to water outlet pipes.

[0015] This utility model provides a buried pipe heat exchanger that increases the contact area between the inlet pipes and the underground soil by setting multiple inlet pipes and one outlet pipe, which are connected by a joint at the bottom. This improves the heat exchange efficiency per unit heat exchange well while keeping the borehole diameter constant. Furthermore, by setting multiple inlet pipes, the total flow rate in the pipeline is increased at the same inlet flow velocity, further enhancing the heat exchange capacity per unit heat exchange well. A support portion is provided at the top center of the joint, facilitating its engagement with a push rod during lowering. The push rod abuts against the support portion and pushes the joint, along with the multiple inlet and outlet pipes, down the borehole, ensuring smooth lowering. This increases the heat exchange area and improves heat exchange efficiency while maintaining the borehole diameter, and also solves the problem of jamming or installation failure during lowering. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a buried pipe heat exchanger provided by this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of a buried pipe heat exchanger provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the radial cross-sectional structure of a connector provided by this utility model.

[0020] Figure label: 1. Connector; 11. Cavity; 12. Bearing part; 121. Groove; 13. Cone; 131. Second threaded section; 132. Guide groove; 14. Cylinder; 141. First threaded section; 15. Support column; 16. Guide plate; 2. Inlet pipe; 3. Outlet pipe; 4. Seal; 5. Limit pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] The following is combined with Figure 1-3 This utility model provides a buried pipe heat exchanger, comprising: a connector 1, multiple inlet pipes 2, and an outlet pipe 3, wherein: The connector 1 has an internal cavity 11, and a bearing part 12 that mates with the push rod is provided at the top center of the connector 1.

[0023] Multiple water inlet pipes 2 are connected to the top of connector 1.

[0024] The water outlet pipe 3 is connected to the top of the connector 1.

[0025] Among them, multiple water inlet pipes 2 and water outlet pipes 3 are connected through cavity 11.

[0026] In this invention, by setting multiple inlet pipes 2 and one outlet pipe 3, which are connected by a connector 1 at the bottom, the contact area between the inlet pipes 2 and the underground soil is increased. This improves the heat exchange efficiency per unit heat exchange well while keeping the borehole diameter constant. Furthermore, by setting multiple inlet pipes 2, the total flow rate in the pipeline is increased at the same inlet flow velocity, further enhancing the heat exchange capacity per unit heat exchange well. A support part 12 is provided at the top center of the connector 1, facilitating its engagement with a push rod during lowering. The push rod abuts against the support part 12 and pushes the connector 1, along with the multiple inlet pipes 2 and outlet pipe 3, down the borehole, ensuring smooth lowering of the connector 1. This increases the heat exchange area and improves heat exchange efficiency while maintaining the borehole diameter, and also solves the problem of jamming or installation failure during lowering.

[0027] Specifically, connector 1 not only connects multiple inlet pipes 2 and outlet pipes 3, but also assists in the overall lowering and installation of the buried pipe heat exchanger. The outer diameter of connector 1 matches the inner diameter of the borehole. During the lowering process, the contact rod needs to apply a downward thrust to connector 1. By setting a bearing part 12 at the center of the top of connector 1, the force of the contact rod on connector 1 can be located on the central axis of connector 1, thereby ensuring that connector 1 is subjected to uniform force and preventing connector 1 from tilting or even getting stuck in the borehole during the lowering process.

[0028] In related technologies, current buried pipe heat exchangers generally use U-shaped tubes. One end of the U-shaped tube is for water inlet, the other end is for water outlet, and the middle is through a bend at the bottom. Typically, two U-shaped tubes are installed in a heat exchange well. Adding more U-shaped tubes requires increasing the inner diameter of the borehole, making the heat exchange capacity per unit well essentially constant under the corresponding geological conditions, resulting in low heat exchange efficiency. This necessitates a larger number of boreholes, which occupy a larger area, increasing drilling costs and initial construction costs. In this invention, a connector 1 is used to connect multiple inlet pipes 2 and one outlet pipe 3, avoiding the space occupied by the bends in the U-shaped tubes. More inlet pipes 2 can be arranged within a borehole of the same inner diameter, thereby increasing the heat exchange area with the underground soil, improving the heat exchange efficiency per unit well, and ultimately reducing the number of boreholes, the area occupied by the boreholes, drilling costs, and initial construction costs.

[0029] In some embodiments, multiple inlet pipes 2 and outlet pipes 3 are arranged around the support portion 12.

[0030] In this invention, by arranging multiple inlet pipes 2 and outlet pipes 3 around the support part 12, the pipe layout at the joint 1 is made more uniform. When the support part 12 is subjected to the thrust of the top rod, the thrust can be evenly transmitted to each pipe connection point through the joint 1, avoiding deformation or tilting of the joint 1 caused by unilateral force. The surrounding layout ensures that the distance from each pipe connection point to the support part 12 is equal, resulting in a more uniform force distribution and ensuring the stability of the joint 1 during the lowering process. At the same time, the surrounding layout makes the overall shape of the joint 1 more compact, accommodating more pipes within the limited drilling space and improving space utilization efficiency. Specifically, the pipe arrangement around the support part 12 forms a symmetrical structure. When the top rod applies a downward thrust, the support part 12 distributes the thrust to each pipe connection point through the joint 1 structure. Due to the symmetrical distribution of the connection points, the force borne by each connection point is relatively uniform. This symmetrical layout also ensures that the center of gravity of the joint 1 is located at the geometric center, making it less prone to deflection during the lowering process and ensuring the vertical lowering of the heat exchanger.

[0031] In related technologies, pipe connections often employ straight or irregular arrangements. This layout is prone to eccentric loads when subjected to thrust, causing the connector 1 to tilt or rotate during lowering, increasing the risk of jamming. The asymmetrical layout also results in an irregular shape for the connector 1, leading to poor fit in circular boreholes and a higher risk of collision with the borehole wall. In this invention, the symmetrical layout around the support portion 12 ensures uniform force distribution, maintaining a stable posture for the connector 1 during lowering, preventing jamming, and improving the installation success rate.

[0032] In some embodiments, the diameter of the inlet pipe 2 is smaller than the diameter of the outlet pipe 3.

[0033] In this invention, by setting the diameter of the inlet pipe 2 to be smaller than that of the outlet pipe 3, the flow velocity in the inlet pipe 2 is relatively higher and the flow velocity in the outlet pipe 3 is relatively lower under the same system flow rate. The higher inlet flow velocity enhances the heat exchange effect between the fluid and the pipe wall, improving the heat exchange efficiency of the inlet section; the lower outlet flow velocity reduces the flow resistance of the fluid in the outlet pipe 3, lowering the system's pressure loss. This differentiated pipe diameter design achieves a balanced optimization between heat exchange effect and flow resistance, ensuring good heat transfer performance while controlling system energy consumption.

[0034] Specifically, the multiple small-diameter inlet pipes 2 ensure the total flow area while maintaining the flow velocity within each pipe within a range conducive to heat transfer, thus enhancing heat exchange between the fluid and the underground soil. The large-diameter outlet pipe 3 provides sufficient flow cross-section for the collected fluid, avoiding increased flow resistance caused by excessively small pipe diameters and reducing pump power consumption during system operation.

[0035] In related technologies, the inlet and outlet sections of a U-shaped pipe use the same pipe diameter. This equal-diameter design makes it difficult to simultaneously achieve good heat transfer and flow resistance. If the pipe diameter is too small, although the higher flow velocity is beneficial for heat transfer, it will increase flow resistance; if the pipe diameter is too large, although the flow resistance is lower, the lower flow velocity will affect the heat transfer effect. In this invention, by designing a differentiated pipe diameter for the inlet pipe 2 and the outlet pipe 3, the inlet section maintains a higher flow velocity to enhance heat transfer, while the outlet section uses a larger pipe diameter to reduce resistance, thus achieving a harmonious balance between heat transfer performance and flow resistance.

[0036] In some embodiments, the number of water inlet pipes 2 is 3-6, and the diameter of the water inlet pipes 2 is De20-De32; the diameter of the water outlet pipes 3 is De32-De50.

[0037] This invention provides a standardized configuration scheme for ground source heat pump systems of different scales by limiting the number of inlet pipes 2 to 3-6 with a diameter range of De20-De32, and the diameter of outlet pipes 3 to De32-De50. These specific quantities and pipe diameter specifications are determined based on the heat exchange requirements and drilling conditions in actual engineering applications, meeting the needs of different application scenarios from small residences to medium-sized buildings. The clearly defined specification range facilitates selection by engineering designers based on system capacity and also enables manufacturers to standardize production.

[0038] Specifically, the number of inlet pipes (2) ranging from 3 to 6 can accommodate different heat exchange power requirements. 3 inlet pipes (2) are suitable for small systems, 4-5 for medium-sized systems, and 6 for larger systems. The inlet pipe diameters of De20-De32 can maintain a suitable flow velocity under normal flow conditions, ensuring heat transfer efficiency while avoiding excessive resistance. The outlet pipe diameters of De32-De50 ensure smooth transport of the collected fluid, avoiding excessive outlet resistance.

[0039] In related technologies, the specifications and configurations of buried pipe heat exchangers often lack unified standards. Designers need to recalculate and design according to the specific requirements of each project, increasing the workload and cost of design. Manufacturers also find it difficult to standardize their products, resulting in low production efficiency. In contrast, this utility model provides a standardized selection basis for engineering applications by specifying the quantity and pipe diameter range, simplifying the design process, improving design efficiency, and facilitating mass production for manufacturers, thereby reducing manufacturing costs.

[0040] In one specific embodiment, there are four inlet pipes 2 and one outlet pipe 3. The diameter of the inlet pipe 2 is De25 and the diameter of the outlet pipe 3 is De40.

[0041] In some embodiments, the support portion 12 is provided with a groove 121 that mates with the top rod.

[0042] In this invention, a groove 121, which mates with the push rod, is provided in the bearing portion 12, providing a precise positioning reference for the push rod and ensuring a stable fit between the push rod and the bearing portion 12. The groove 121 provides a clear positional constraint for the push rod during insertion, preventing relative sliding or separation between the push rod and the bearing portion 12 during lowering. The geometry of the groove 121 matches the head of the push rod, forming a good mechanical fit and increasing the reliability of the connection. Specifically, the groove 121 provides an accurate insertion position for the push rod. When the push rod is inserted into the groove 121, it forms a constraint in the horizontal direction, preventing lateral displacement of the push rod during the pushing process. The depth and shape design of the groove 121 increase the contact area between the push rod and the bearing portion 12, resulting in a more uniform distribution of contact stress and avoiding localized damage caused by stress concentration.

[0043] In related technologies, the installation of buried pipe heat exchangers often uses rope binding or temporary clamps. These connection methods are not stable enough and are prone to detachment or displacement during the lowering process, leading to installation failure. Even with specialized pushing tools, they mostly use planar contact, which is unstable and the pushing force is prone to deviating from the center line. In this utility model, the specially designed groove 121 provides precise positioning and stable connection for the push rod, ensuring the controllability of the lowering process and the success rate of installation.

[0044] In some embodiments, the connector 1 includes: a cone 13; a cylinder 14, the bottom of the cylinder 14 being an open structure connected to the top of the cone 13, and the cylinder 14 and the cone 13 forming a cavity 11; wherein, the inlet pipe 2 and the outlet pipe 3 are respectively connected to the top of the cylinder 14, and the support part 12 is disposed on the top of the cylinder 14.

[0045] In this invention, the manufacturing challenge of the complex internal cavity connector 1 is solved by employing a combined structure of a cone 13 and a cylinder 14. The cone 13 is a solid structure, and the cylinder 14 has an opening at its bottom. When assembled, the two form the required cavity 11. This split design decomposes the complex internal cavity structure into two simple geometric shapes, each of which can be manufactured using conventional machining methods, significantly reducing manufacturing difficulty and cost. Simultaneously, the conical shape of the cone 13 provides excellent guidance for fluid collection, improving the fluid collection effect.

[0046] Specifically, the cone 13, as a solid body of revolution, can be formed in one step by turning, achieving high machining accuracy and good surface quality. The machining of the cylinder 14 includes external turning and bottom opening machining, a mature and reliable process. The assembly of the two is simple, and the fitting accuracy is easy to control. The formation of the cavity 11 relies on the fit between the opening of the cylinder 14 and the cone 13, and the shape and volume of the cavity 11 can be precisely controlled by adjusting the dimensions of both.

[0047] In related technologies, collectors with complex internal cavities are typically manufactured using casting or welding processes. Casting requires the creation of specialized molds, which are costly and time-consuming, making them unsuitable for small-batch production. While welding is less expensive, the quality of the weld is difficult to guarantee, easily resulting in defects such as porosity and slag inclusions, affecting the product's sealing performance and reliability. In this invention, the split design avoids direct machining of the complex internal cavity, achieving complex functions through a combination of simple geometric shapes. This not only ensures consistent product quality but also significantly reduces manufacturing costs.

[0048] In some embodiments, a support column 15 is provided axially inside the cavity 11, with the top of the support column 15 connected to the support portion 12 and the bottom abutting against the top of the cone 13.

[0049] In this invention, a direct load transfer path from the bearing portion 12 to the cone 13 is established by axially arranging a support column 15 within the cavity 11. When the bearing portion 12 is subjected to the thrust of the push rod, this thrust is directly transferred to the cone 13 through the support column 15, preventing the thrust from acting on the thin-walled structure of the cylinder 14. The arrangement of the support column 15 significantly improves the load-bearing capacity of the joint 1, preventing deformation or damage to the cylinder 14 under heavy loads. Simultaneously, the support column 15 also provides guidance for the fluid within the cavity 11, improving the fluid flow state.

[0050] Specifically, the top of the support column 15 connects to the bearing portion 12, and the bottom abuts against the top of the cone 13, forming a continuous load-bearing component. When the push rod pushes the bearing portion 12, the thrust is directly transmitted to the bottom cone 13 through the support column 15. The cylinder 14 mainly serves as the pipe connection, and its stress is greatly reduced. The presence of the support column 15 also provides flow guidance for the collected fluid, allowing the fluid to flow orderly towards the outlet pipe 3.

[0051] In related technologies, collectors are mostly hollow structures 11 without internal support components. Under heavy loads, the thin-walled structure is prone to instability and deformation, affecting the sealing performance and service life of the connector 1. The fluid flow within the hollow 11 lacks guidance, easily forming eddies and dead zones, affecting the fluid mixing effect. In this invention, the addition of the support column 15 not only solves the structural load-bearing problem but also improves the fluid flow characteristics, achieving a dual improvement in both structural and fluid performance.

[0052] In some embodiments, the bottom of the cylinder 14 is provided with a first threaded portion 141, and the top of the cone 13 is provided with a second threaded portion 131, and the first threaded portion 141 and the second threaded portion 131 are connected by threads; the buried pipe heat exchanger further includes: a sealing member 4, disposed between the cylinder 14 and the cone 13, for sealing the connection between the cylinder 14 and the cone 13; and a limiting pin 5, which passes radially through the first threaded portion 141 and the second threaded portion 131, for locking the cylinder 14 and the cone 13.

[0053] In this invention, the reliability of the connection is ensured by employing a combination of threaded connection, sealing element 4, and locking pin 5. The threaded connection provides reliable mechanical connection strength, the sealing element 4 ensures the sealing performance at the connection point, and the locking pin 5 prevents the threads from loosening during long-term use.

[0054] Specifically, the first threaded portion 141 and the second threaded portion 131 form a standard threaded pair, providing sufficient connection strength while facilitating on-site assembly. The seal 4 is disposed within an annular groove at the connection point. When the threads are tightened, the seal 4 is compressed and deformed, tightly fitting against the mating surface to form an effective seal. The limiting pin 5 penetrates radially through the threaded engagement area, preventing loosening of the threaded pair even under vibration or thermal expansion and contraction.

[0055] In some embodiments, the top of the cone 13 is provided with a guide groove 132 facing the water inlet pipe 2 and the water outlet pipe 3.

[0056] In this invention, a guide channel 132 is provided at the top of the cone 13, facing the inlet pipe 2 and the outlet pipe 3, providing a dedicated guiding channel for each stream of incoming fluid and avoiding direct impact and mutual interference when multiple fluid streams converge. The guide channel 132 allows the fluid to smoothly enter the cavity 11 along a preset path, reducing fluid turbulence and energy loss, and improving the fluid convergence effect. Simultaneously, the guide channel 132 also facilitates thorough mixing of the fluid, improving the uniformity of the outlet water temperature.

[0057] Specifically, the flow guide 132 starts from the connection point of each water inlet pipe 2 and extends along the surface of the cone 13 towards the central region, providing an independent flow path for each water inlet pipe 2. When fluid enters from the water inlet pipe 2, it smoothly transitions into the cavity 11 along the guide 132, avoiding mutual impact between fluids from different water inlet pipes 2. The geometric design of the groove 121 makes the fluid flow smoother and reduces local resistance loss.

[0058] In related technologies, the collecting surface of collectors is mostly a simple plane or curved surface, lacking a dedicated fluid guiding design. When multiple fluids converge, they are prone to direct collision at the converging point, generating significant impact losses and turbulence. This not only increases flow resistance but also affects the mixing effect, leading to large fluctuations in the outlet water temperature. In this invention, the specially designed guide channel 132 provides a smooth transition channel for each fluid stream, achieving orderly fluid collection, reducing flow losses, and improving the mixing effect.

[0059] In some embodiments, a guide plate 16 is provided inside the cavity 11, which divides the cavity 11 into multiple guide channels. The input ends of the multiple guide channels are respectively connected to multiple water inlet pipes 2, and the output ends of the multiple guide channels are connected to water outlet pipes 3.

[0060] In this invention, by setting a guide plate 16 inside the cavity 11, the cavity 11 is divided into multiple guide channels, realizing the independent delivery and orderly collection of multiple streams of inlet fluid. Each guide channel corresponds to one inlet pipe 2, avoiding mutual interference between fluids in different inlet pipes 2 and ensuring uniform distribution of each stream of fluid. The setting of the guide plate 16 eliminates dead zones and chaotic flow within the cavity 11, improving the uniformity of fluid distribution. At the same time, the guide plate 16 also acts as an internal reinforcing rib, improving the structural rigidity of the cavity 11.

[0061] Specifically, the guide plates 16 are arranged according to the number and distribution angle of the inlet pipes 2, dividing the cavity 11 into a corresponding number of fan-shaped regions, each with basically the same geometric dimensions and resistance characteristics. When the fluid enters from each inlet pipe 2, it flows independently within the corresponding guide channel, avoiding cross-interference of the fluid. The presence of the guide plates 16 also eliminates large-scale eddies that may occur within the cavity 11, making the fluid flow more orderly.

[0062] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A buried pipe heat exchanger, characterized in that, include: The connector (1) has a cavity (11) inside and a bearing part (12) that cooperates with the top rod at the top center position of the connector (1). Multiple water inlet pipes (2) are connected to the top of the connector (1); The water outlet pipe (3) is connected to the top of the connector (1); Multiple inlet pipes (2) are connected to the outlet pipe (3) through the cavity (11).

2. The buried pipe heat exchanger according to claim 1, characterized in that, Multiple inlet pipes (2) and outlet pipes (3) are arranged around the support portion (12).

3. The buried pipe heat exchanger according to claim 2, characterized in that, The diameter of the inlet pipe (2) is smaller than the diameter of the outlet pipe (3).

4. The buried pipe heat exchanger according to claim 1, characterized in that, The number of inlet pipes (2) is 3-6, and the diameter of the inlet pipes (2) is De20-De32; the diameter of the outlet pipes (3) is De32-De50.

5. The buried pipe heat exchanger according to claim 1, characterized in that, The bearing part (12) is provided with a groove (121) that cooperates with the top rod.

6. The buried pipe heat exchanger according to claim 1, characterized in that, The connector (1) includes: Cone (13); A cylinder (14) has an open bottom structure that connects to the top of a cone (13), and the cylinder (14) and the cone (13) together form the cavity (11). The water inlet pipe (2) and the water outlet pipe (3) are respectively connected to the top of the cylinder (14), and the bearing part (12) is disposed on the top of the cylinder (14).

7. The buried pipe heat exchanger according to claim 6, characterized in that, A support column (15) is provided axially inside the cavity (11). The top of the support column (15) is connected to the bearing part (12), and the bottom abuts against the top of the cone (13).

8. The buried pipe heat exchanger according to claim 6, characterized in that, The bottom of the cylinder (14) is provided with a first threaded portion (141), and the top of the cone (13) is provided with a second threaded portion (131). The first threaded portion (141) and the second threaded portion (131) are connected by threads. The buried pipe heat exchanger also includes: A sealing element (4) is disposed between the cylinder (14) and the cone (13) for sealing the connection between the cylinder (14) and the cone (13); A limiting pin (5) passes radially through the first threaded portion (141) and the second threaded portion (131) to lock the cylinder (14) and the cone (13).

9. The buried pipe heat exchanger according to claim 8, characterized in that, The top of the cone (13) is provided with a guide groove (132) facing the water inlet pipe (2) and the water outlet pipe (3).

10. The buried pipe heat exchanger according to any one of claims 1-9, characterized in that, A guide plate (16) is provided inside the cavity (11). The guide plate (16) divides the cavity (11) into multiple guide channels. The input ends of the multiple guide channels are respectively connected to the multiple water inlet pipes (2), and the output ends of the multiple guide channels are connected to the water outlet pipes (3).

Images