CN104833134B - Buried tube heat exchanger and heat exchange system - Google Patents

Abstract

The invention provides an underground pipe heat exchanger and a heat exchange system, wherein the underground pipe heat exchanger includes: at least two underground pipes, a U-shaped end connecting the bottoms of the two underground pipes, and a Connectors for at least two underground pipes; wherein, an extension arm is provided on the outer surface of each underground pipe, and the length of the extension arm in the direction of the center line of the underground pipe is equal to the length of the underground pipe; so The end of the extension arm away from the underground pipe is provided with a first clamping portion, and the connector is provided with at least two second clamping portions for connecting to the first clamping portion. The underground pipe heat exchanger and heat exchange system provided by the invention can improve the density of soil backfill and improve heat transfer efficiency. At the same time, it has good expandability and can adapt to the needs of various construction environments.

Description

Buried tube heat exchanger and heat exchange system

technical field

The invention relates to a buried tube heat exchanger structure and enhanced heat exchange technology, in particular to a buried tube heat exchanger and a heat exchange system.

Background technique

The buried tube heat exchanger is a device that uses the relatively stable temperature of the underground soil to exchange heat with the soil through the piping system buried deep in the soil around the building. The pipeline system in the soil and the pipeline system in the building are respectively connected with circulating fluid. In winter, the soil acts as a heat source, and the circulating fluid absorbs the heat in the soil, and provides it to the building for heating through the heat pump unit; in summer, the soil As a cooling source, the circulating fluid absorbs the heat in the building and discharges it to the soil through the heat pump unit. Compared with traditional coal and gas heating methods and air-conditioning refrigeration methods, buried tube heat exchangers only need to consume a small amount of electric energy to achieve the same heating or cooling effect, low operating costs, and do not produce any harmful substances. Energy saving and environmental protection.

At present, the buried pipe heat exchanger mainly includes at least two buried pipes. The buried pipes are inserted vertically downward into the soil, and the bottoms of the two buried pipes are connected by U-shaped ends to form a U-shaped structure. In order to prevent the two buried pipes from being entangled with each other, pipe clamps are also provided between the two buried pipes to ensure the horizontal distance between the buried pipes. Along the depth direction of the buried pipe, a pipe clip is provided every 2m to 4m, which is used to separate the two buried pipes and fix their relative positions. After the buried pipes and pipe clamps are installed and the soil is backfilled, due to the horizontal barrier of the pipe clamps, the soil below them is easily not compacted, and air pockets are prone to appear, which increases the thermal resistance of the backfilled soil and causes transmission Thermal effects worsen.

Contents of the invention

The invention provides a buried pipe heat exchanger and a heat exchange system, which are used for improving the compactness of soil backfill and improving heat transfer efficiency.

An embodiment of the present invention provides a buried pipe heat exchanger, including: at least two buried pipes, a U-shaped end connecting the bottoms of the two buried pipes, and a connector for fixing the at least two buried pipes; Wherein, the outer surface of each buried pipe is provided with an extension arm, and the length of the extension arm in the direction of the centerline of the buried pipe is equal to the length of the buried pipe; The end portion of the connector is provided with a first clamping portion, and the connector is provided with at least two second clamping portions for connecting with the first clamping portion.

In the buried pipe heat exchanger described above, the projection of the first clamping portion on a plane perpendicular to the centerline of the buried pipe is T-shaped, and the second clamping portion is a T-shaped groove.

In the above-mentioned buried pipe heat exchanger, the projection of the first fastening part on a plane perpendicular to the centerline of the buried pipe is a dovetail shape, and the second fastening part is a dovetail groove.

In the buried pipe heat exchanger described above, the number of the extension arms is two, and the two extension arms are axially symmetrical to the center line of the buried pipe.

According to the buried pipe heat exchanger described above, the number of the second fastening parts is two.

According to the buried pipe heat exchanger described above, the number of the second fastening parts is four.

In the above-mentioned buried pipe heat exchanger, the number of said buried pipes is four, and the first clamping parts in the four buried pipes are respectively connected with the four second clamping parts in the connecting piece .

In the buried pipe heat exchanger described above, the buried pipe includes a polyethylene layer and a metal layer, and the polyethylene layer is outside the metal layer.

According to the buried pipe heat exchanger described above, the inner surface of the metal layer is provided with threaded ribs.

An embodiment of the present invention also provides a heat exchange system, including: a heat exchanger inside a building, a heat pump, and the above-mentioned buried pipe heat exchanger, and the buried pipe heat exchanger is deeply buried in the soil near the building Inside; the top of the buried pipe in the buried pipe heat exchanger is connected to one end of the heat pump through a liquid inlet pipe and a liquid outlet pipe, and the other end of the heat pump is connected to the internal heat exchanger of the building.

In the technical solution provided by the embodiment of the present invention, an extension arm is provided on the outer surface of each underground pipe, and a first clamping part is provided at the end of the extension arm far away from the underground pipe, and a structure capable of engaging with the first clamp is adopted. At least two underground pipes are fixedly connected by the connecting piece of the second fastening part which is fastened and connected, so as to prevent the buried pipes from being entangled with each other during construction. Moreover, the length of the extension arm in the direction of the centerline of the buried pipe is equal to the length of the buried pipe, so that there is no barrier in the vertical direction. Therefore, in the process of soil backfilling, the soil around the buried pipe is It can be compacted, which improves the compactness of the backfill soil, avoids the generation of air pockets, reduces the thermal resistance of the backfill soil, and improves the heat transfer efficiency. Moreover, compared with the way in which multiple pipe clips are required in the prior art, the technical solution provided by this embodiment can reduce the difficulty of construction.

Description of drawings

Fig. 1 is a top sectional view of a buried pipe heat exchanger provided by an embodiment of the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is a top sectional view of the buried pipe in the buried pipe heat exchanger provided by the embodiment of the present invention;

Fig. 4 is a front sectional view of the buried pipe in the buried pipe heat exchanger provided by the embodiment of the present invention;

Fig. 5 is a top view of a connecting piece in the buried pipe heat exchanger provided by the embodiment of the present invention;

Fig. 6 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention;

Fig. 7 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 8 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 9 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 10 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 11 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 12 is a schematic structural diagram of the parallel connection of each group of buried pipes provided by the embodiment of the present invention;

Fig. 13 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention;

Fig. 14 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 15 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention;

Fig. 16 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention;

Fig. 17 is a top sectional view of a buried tube in another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 18 is a top sectional view of another buried pipe heat exchanger provided by an embodiment of the present invention;

Fig. 19 is a top view of another connecting piece in the buried pipe heat exchanger provided by the embodiment of the present invention;

Fig. 20 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 21 is a front sectional view of a buried tube in another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 22 is a front sectional view of a buried tube in another buried tube heat exchanger provided by an embodiment of the present invention;

Fig. 23 is a schematic diagram of a heat transfer calculation model of a buried tube heat exchanger provided by an embodiment of the present invention.

detailed description

Fig. 1 is a top sectional view of a buried pipe heat exchanger provided by an embodiment of the present invention, and Fig. 2 is a front view of Fig. 1 . As shown in Figures 1 and 2, the buried pipe heat exchanger provided in this embodiment includes: at least two buried pipes 1, a U-shaped end 2 connecting the bottoms of the two buried pipes 1, and a Connector 3 of two underground pipes 1. U-shaped end 2 is used to connect two buried pipes to form a set of U-shaped structures. The circulating fluid can flow in the two buried pipes 1 and U-shaped end 2. The circulating fluid can be water or other liquids. The upper ends of the two underground pipes are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, and the liquid inlet pipe 4 and the liquid outlet pipe 5 are connected with one end of the heat pump, and the other end of the heat pump is connected with the building piping system, so as to Heat transfer between the borehole heat exchanger and the piping system of the building.

Wherein, the outer surface of each buried pipe 1 is provided with an extension arm 11, the length of the extension arm 11 in the direction of the center line of the buried pipe 1 is equal to the length of the buried pipe 1, and the buried pipe 1 can be cylindrical, Then the centerline of the buried pipe 1 is the axis of the buried pipe 1 . Seen from FIG. 2 , in the axial direction of the buried pipe 1 , the upper end surface of the extension arm 11 is flush with the upper end surface of the buried pipe 1 , and the lower end surface of the extension arm 11 is flush with the lower end surface of the buried pipe 1 .

The extension arm 11 can be integrally formed with the buried pipe 1 , or can be fixedly connected with the buried pipe 1 as an independent component.

In Fig. 1, the end of the extension arm 11 away from the buried pipe 1 is provided with a first clamping part 12. Fig. 5 is a top view of a connecting piece in the buried pipe heat exchanger provided by the embodiment of the present invention, as shown in Fig. As shown in FIG. 5 , at least two second engaging portions 31 for connecting with the first engaging portion 12 are provided on the connecting member 3 . The structures of the first clamping portion 12 and the second clamping portion 31 are matched with each other, so that the first clamping portion 12 can be clamped and connected with the second clamping portion 31 . The connecting piece 3 is provided with at least two second clamping parts 31 , which means that one connecting piece 3 can connect at least two buried pipes 1 . The length of the connecting piece 3 may be the same as that of the buried pipe 1 , and the length of the second clamping portion 31 in the direction of the centerline of the buried pipe 1 is the same as the length of the connecting piece 3 .

The structure of the first clamping part 12 and the second clamping part 31 can be set in various forms. Figure 3 is a top sectional view of the buried tube in the buried tube heat exchanger provided by the embodiment of the present invention. The front section view of the buried pipe in the buried pipe heat exchanger provided by the embodiment of the invention. FIG. 3 and FIG. 4 show a form of the first clamping portion 12 , that is, the projection of the first clamping portion 12 on a plane perpendicular to the centerline of the buried pipe 1 is a T-shaped structure. Correspondingly, the second clamping portion 31 in FIG. 5 is a T-shaped slot structure, and the length direction of the T-shaped slot is parallel to the centerline of the buried pipe 1 . The first clamping part 12 of the T-shaped structure can be inserted into the second clamping part 31 of the T-shaped groove structure along the direction of the centerline of the buried pipe 1, which limits the position of the first clamping part 12 perpendicular to the center of the buried pipe 1. Movement within the plane of the line.

In addition, in the direction of the centerline of the buried pipe 1, the length of the first clamping portion 12 is also equal to the length of the buried pipe 1, that is, the upper end surface of the first clamping portion 12 and the upper end surface of the buried pipe 1 flush, the lower end surface of the first clamping portion 12 is flush with the lower end surface of the buried pipe 1 . During the installation process of the underground pipe 1 and the connecting piece 3, in the vertical direction, connect the two second clamping parts 31 of the connecting piece 3 with the first one of the two underground pipes 1 respectively from top to bottom. The clamping part 12 is plugged in. Refer to Figure 1 and Figure 2 for the structure after the two buried pipes 1 shown in Figure 3 and Figure 4 are fixedly connected through the connecting piece shown in Figure 5. The buried pipe heat exchanger shown in Figure 1 can also be called It is a single U-shaped heat exchanger.

In the technical solution provided by the embodiment of the present invention, an extension arm is provided on the outer surface of each underground pipe, and a first clamping part is provided at the end of the extension arm far away from the underground pipe, and a structure capable of engaging with the first clamp is adopted. At least two underground pipes are fixedly connected by the connecting piece of the second fastening part which is fastened and connected, so as to prevent the buried pipes from being entangled with each other during construction. Moreover, the length of the extension arm in the direction of the centerline of the buried pipe is equal to the length of the buried pipe, so that there is no barrier in the vertical direction. Therefore, in the process of soil backfilling, the soil around the buried pipe is It can be compacted, which improves the compactness of the backfill soil, avoids the generation of air pockets, reduces the thermal resistance of the backfill soil, and improves the heat transfer efficiency. Moreover, compared with the way in which multiple pipe clips are required in the prior art, the technical solution provided by this embodiment can reduce the difficulty of construction.

Fig. 6 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention. In addition to the connecting piece 3 shown in FIG. 5, the structure shown in FIG. A buried pipe 1, as shown in FIG. 7, which is a top sectional view of another buried pipe heat exchanger provided by an embodiment of the present invention. In Fig. 7, four buried pipes 1 are included, and the first clamping parts 12 of the buried pipes 1 are respectively connected with the clamping parts 3 having four second clamping parts 31 shown in Fig. 6, so that the four ground pipes The buried pipes 1 are fixed together to form a cross-shaped structure. In addition, in Fig. 7, the bottoms of any two buried pipes 1 are connected by U-shaped ends 2 to form a double U-shaped heat exchanger, wherein two buried pipes 1 connected by U-shaped ends 2 are regarded as a group , each of the two groups is connected to the liquid inlet pipe 4 and the liquid outlet pipe 5, which is equivalent to a parallel connection between the two groups.

For the structure of the buried pipe 1 mentioned in the above scheme, two extension arms 11 can be arranged on the outer surface of the buried pipe 1, and the two extension arms 11 are axially symmetrical to the center line of the buried pipe 1, as shown in Figure 3 and The structure shown in Figure 4. Therefore, the connectors and buried pipes provided in this embodiment have good expandability. For example, by combining the two connectors shown in Figure 5 and Figure 6, other forms of buried pipe heat exchangers can be obtained by combining them. . In addition, the number of extension arms 11 provided on the outer surface of the buried pipe 1 can also be one, three or more than three, and multiple buried pipes 1 with different numbers of extension arms 11 can form buried pipes with various structures. Heat Exchanger.

Fig. 8 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention. As shown in FIG. 8 , the buried pipe heat exchanger includes 6 buried pipes, wherein the four buried pipes 1 are connected together through the connectors 3 with four second clamping parts 31 shown in FIG. 6 , Wherein, the two opposite buried pipes 1 are respectively connected with the other two buried pipes 1 by using the connector 3 having two second clamping parts 31 as shown in FIG. 5 . In Fig. 8, the bottoms of any two buried pipes 1 are connected by U-shaped ends 2 to form a triple U-shaped heat exchanger, wherein two buried pipes 1 connected by U-shaped ends 2 serve as a set of loops, There are three groups of circuits in Fig. 8, and the three groups of circuits are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, which is equivalent to parallel connection among the three groups of circuits.

Fig. 9 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention. As shown in Fig. 9, the buried pipe heat exchanger includes 8 buried pipes. On the basis of Fig. The connecting piece 3 of the two clamping parts 31 is connected with the two underground pipes 1 of two positions. In Fig. 9, the bottoms of any two buried pipes 1 are connected by U-shaped ends 2 to form a four-U-shaped heat exchanger, wherein two buried pipes 1 connected by U-shaped ends 2 serve as a group of loops, There are four groups of circuits in Fig. 9, and the four groups of circuits are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, which is equivalent to parallel connection between the four groups of circuits.

Fig. 10 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention. As shown in FIG. 10 , the buried pipe heat exchanger includes four buried pipes 1 , which are sequentially connected in a zigzag shape through the connectors 3 having four second clamping portions 31 shown in FIG. 6 . In Fig. 10, the bottoms of any two buried pipes 1 are connected by U-shaped ends 2, wherein the two buried pipes 1 connected by U-shaped ends 2 serve as a group of loops. There are two groups of loops in Fig. 10, The two groups of circuits are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, which is equivalent to parallel connection between the two groups of circuits.

Fig. 11 is a top sectional view of another buried tube heat exchanger provided by an embodiment of the present invention. As shown in Figure 11, the buried pipe heat exchanger includes twelve buried pipes 1, which are connected by the connectors 3 with four second clamping parts 31 shown in Figure 6 to form the structure shown in Figure 11 . In Fig. 11, the bottoms of any two buried pipes 1 are connected by U-shaped ends 2 to form a well-shaped heat exchanger, wherein the two buried pipes 1 connected by U-shaped ends 2 serve as a group of loops, as shown in Fig. There are six groups of circuits in 11, and the six groups of circuits are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, which is equivalent to parallel connection between the six groups of circuits.

For the parallel relationship between the various groups of circuits, please refer to FIG. 12 , which is a schematic structural diagram of the parallel connection of various groups of buried pipes provided by the embodiment of the present invention. In each group of loops, the upper ends of the two buried pipes 1 are respectively connected with the liquid inlet pipe 4 and the liquid outlet pipe 5, the liquid inlet pipe 4 is further connected with the liquid supply pipe 6 of the circulating fluid, and the liquid outlet pipe 5 is further connected with the liquid outlet pipe 5 of the circulating fluid. The liquid return pipe 7 is connected to each other. The circulation fluid supply pipe 6 and the circulation fluid return pipe 7 are respectively connected to one end of the heat pump, forming a circulation loop with one end of the heat pump. The circulating fluid flows from the liquid supply pipe 6 through each buried pipe 1, and after heat exchange with the soil, it is collected into the liquid return pipe 7 to complete the ground source heat exchange process. In Fig. 12, the structure shown by the dotted line is the buried hole 8. In the process of installing the buried pipe, the buried hole 8 must be excavated underground first, and then the buried pipe 1 is put into the buried hole 8. Backfill soil or other backfill materials in the buried hole 8 again.

In addition to the above-mentioned several connection methods, technicians can also design other connection methods. Using the above-mentioned buried pipe 1 and connector 3 can form a variety of circuits, so that the buried pipe heat exchanger provided in this embodiment has excellent performance. Expansibility, can more flexibly adapt to the requirements of various construction sites.

Fig. 13 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention. On the basis of the above technical solution, besides the structure shown in Figure 5 or Figure 6, the above-mentioned connector 3 can also be designed in other ways, such as the method in Figure 13, the middle of the connector 3 is a hollow structure , Four symmetrical second engaging parts 31 are arranged around the hollow structure. Using the connector 3 shown in FIG. 13 , four buried pipes 1 can be fixed, as shown in FIG. 14 , which is a top sectional view of another buried pipe heat exchanger provided by an embodiment of the present invention.

Fig. 15 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention. The connecting piece 3 can also be arranged as a structure as shown in FIG. 15 , with a solid structure rather than a hollow structure in the middle. Four symmetrical second clamping parts 31 are arranged around the solid structure of the connecting piece 3 to fix four underground pipes 1 .

Fig. 16 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention. As shown in Figure 16, the connecting piece 3 can also be set as the structure shown in Figure 16, the connecting piece 3 is provided with two second clamping parts 31, and the two second clamping parts 31 are both dovetail grooves, the dovetails The length direction of the groove is parallel to the centerline of the buried pipe 1 . Correspondingly, the projection of the first clamping portion 12 in the buried pipe 1 on a plane perpendicular to the centerline of the buried pipe 1 is dovetail-shaped, and the length direction of the first clamping portion 12 is aligned with the centerline of the buried pipe 1 parallel. The first clamping part 12 of dovetail structure can be inserted into the dovetail groove along the direction of the centerline of the buried pipe 1 . As shown in Fig. 17, Fig. 17 is a top cross-sectional view of the buried pipe in the buried pipe heat exchanger provided by the embodiment of the present invention. The two buried pipes 1 shown in Fig. 17 can be fixedly connected by using the connector 3 shown in Fig. 16, and the structure after connection can be referred to Fig. 18, which is another buried pipe replacement provided by the embodiment of the present invention. Cross-sectional view of the heater.

Fig. 19 is a top view of another connecting piece in the buried tube heat exchanger provided by the embodiment of the present invention. As shown in FIG. 19 , four second engaging portions 31 may also be provided in the connector 3 , and the four second engaging portions 31 are all dovetail grooves. Then the connecting piece 3 can be fixedly connected to four buried pipes 1 at the same time, as shown in FIG. 20 , which is a top sectional view of another buried pipe heat exchanger provided by an embodiment of the present invention.

On the basis of the above technical solution, this embodiment further improves the structure of the buried pipe 1, as shown in Figure 3, the buried pipe 1 may specifically include a two-layer structure of a polyethylene layer 13 and a metal layer 14, Wherein, the polyethylene layer 13 is outside the metal layer 14 .

Since the polyethylene material has the advantages of good anti-corrosion, strong flexibility, not easy to be twisted and broken, and convenient for construction, setting the polyethylene layer on the outside can improve the wear resistance and corrosion resistance of the buried pipe and prolong the service life. The metal layer has better thermal conductivity and higher strength. If it is arranged on the inner side, the thickness of the polyethylene layer can be reduced under the premise of ensuring the strength of the buried pipe, which reduces the overall thermal resistance of the buried pipe and further improves heat transfer. efficiency.

In order to further improve the heat transfer efficiency of the buried pipe, threaded ribs 15 may also be provided on the inner surface of the metal layer 14 and made of metal, as shown in FIG. 4 . The advantage of providing the threaded ribs 15 is that it can also increase the disturbance of the circulating fluid in the buried pipe 1, realize a turbulent flow state, improve the convective heat transfer coefficient, and further reduce the heat transfer heat resistance.

Fig. 21 is a front sectional view of a buried pipe in another buried pipe heat exchanger provided by an embodiment of the present invention, and Fig. 22 is a buried pipe in another buried pipe heat exchanger provided by an embodiment of the present invention sectional view of the front view. In addition to the threaded ribs 15 , technicians can also provide other forms, as shown in FIG. 21 or 22 , in FIG. 21 , the inner surface of the metal layer 14 is provided with serrated ribs 16 . In FIG. 22 , grid-shaped ribs 17 are provided on the inner surface of the metal layer 14 .

Using the above-mentioned buried pipe heat exchanger buried in the soil, the thermal resistance in the heat exchange includes the following items: the thermal resistance of the soil layer Rs, the thermal resistance of the backfill material Rg, the thermal resistance of the buried pipe wall Rpm and the inner side of the buried pipe The convective thermal resistance Rf of the tube wall, the unit of thermal resistance is m·℃/W.

Fig. 23 is a schematic diagram of a heat transfer calculation model of a buried tube heat exchanger provided by an embodiment of the present invention. For the above-mentioned buried tube heat exchanger, a heat transfer calculation model can be established, as shown in Figure 23. In the figure, Ts is the initial temperature of the soil around the buried tube heat exchanger, and Tb is the average temperature of the buried well wall. Tg is the average temperature of the backfill material, and Tf is the average temperature of the liquid entering and exiting the circulating fluid in the buried tube heat exchanger.

According to the calculation method in "Technical Specifications for Ground Source Heat Pump System Engineering" GB50366-2005 (2009 edition), since the buried pipe heat exchanger in this embodiment uses a composite pipe made of outer layer polyethylene and inner layer metal, it can reduce ground Buried pipe wall thermal conductivity Rpm. In addition, since the inner surface of the metal layer is provided with metal threaded ribs, it can promote the turbulence of the circulating fluid and increase the heat exchange area, so it can also reduce the convective thermal resistance Rf of the inner wall of the buried pipe. The buried pipes are plugged with connectors, which effectively ensures the compactness of the backfill, avoids the generation of air pockets, and reduces the thermal resistance Rg of the backfill material. And because of the plug-in structure, thermal short circuit is effectively avoided, so that the heat exchange effect of the buried pipe is better, and the heat exchange efficiency is improved. Compared with the conventional mainstream buried pipe with the same diameter in the prior art, this embodiment The heat exchange capacity of the provided buried tube heat exchanger is increased by at least 5%.

In addition, this embodiment also provides a heat exchange system, including: a building internal heat exchanger arranged in a building, a heat pump, and any one of the above-mentioned buried pipe heat exchangers, wherein the buried pipe heat exchanger is as deep as Buried in the soil near the building, the top of the buried pipe in the buried pipe heat exchanger is connected to one end of the heat pump through the liquid inlet pipe and the liquid outlet pipe, and the other end of the heat pump is connected to the heat exchanger inside the building.

In this heat exchange system, by using the above-mentioned buried pipe heat exchanger, an extension arm is provided on the outer surface of each buried pipe, and a first clamping part is provided at the end of the extension arm away from the buried pipe, and a The connecting piece of the second clamping part that is clamped and connected with the first clamping part securely connects at least two underground pipes, so as to avoid mutual entanglement of the buried pipes during construction. Moreover, the length of the extension arm in the direction of the centerline of the buried pipe is equal to the length of the buried pipe, so that there is no barrier in the vertical direction. Therefore, in the process of soil backfilling, the soil around the buried pipe is It can be compacted, which improves the compactness of the backfill soil, avoids the generation of air pockets, reduces the thermal resistance of the backfill soil, and improves the heat transfer efficiency. Moreover, compared with the way in which multiple pipe clips are required in the prior art, the technical solution provided by this embodiment can reduce the difficulty of construction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (9)

1. a kind of ground heat exchanger, it is characterised in that including：At least two underground pipes, two U-shapeds of buried bottom of the tube of connection Termination and for fixed at least two connectors of underground pipe；Wherein, the outer surface of every underground pipe is provided with spreading arm, institute State the equal length of length of the spreading arm on the underground pipe centerline direction and underground pipe；Away from described in the spreading arm The end of underground pipe is provided with the first Access Division, and the connector is provided with least two is used for what is be connected with first Access Division Second Access Division；

The quantity of the spreading arm is two, and two spreading arms are symmetrical with the centerline axis of the underground pipe；

The structure of first Access Division and the second Access Division is mutually matched, the length of the connector and the length of underground pipe Degree is identical, and length of second Access Division on underground pipe centerline direction is identical with the length of connector.

2. ground heat exchanger according to claim 1, it is characterised in that first Access Division is perpendicular to described Being projected as in the plane of pipe laying center line is T-shaped, and second Access Division is T-slot.

3. ground heat exchanger according to claim 1, it is characterised in that first Access Division is perpendicular to described Swallow-tail form is projected as in the plane of pipe laying center line, second Access Division is dovetail groove.

4. the ground heat exchanger according to Claims 2 or 3, it is characterised in that the quantity of second Access Division is two It is individual.

5. the ground heat exchanger according to Claims 2 or 3, it is characterised in that the quantity of second Access Division is four It is individual.

6. ground heat exchanger according to claim 5, it is characterised in that the quantity of the underground pipe is four, four The first Access Division in underground pipe is connected with four the second Access Divisions in the connector respectively.

7. ground heat exchanger according to claim 1, it is characterised in that the underground pipe includes polyethylene layer and metal Layer, the polyethylene layer is in the outside of the metal level.

8. ground heat exchanger according to claim 7, it is characterised in that the inner surface of the metal level is provided with screw thread rib Bar.

9. a kind of heat-exchange system, it is characterised in that including：Interior of building heat exchanger, heat pump and such as claim 1-8 are any Ground heat exchanger described in, in the buried soil near building of the ground heat exchanger；The underground pipe heat exchange The top of underground pipe goes out through feed tube and drain pipe and is connected with one end of heat pump in device, the other end of the heat pump and the building Thing internal exchanger is connected.