CN212299509U

CN212299509U - Middle-deep sleeve type buried pipe heat exchanger

Info

Publication number: CN212299509U
Application number: CN202021030901.2U
Authority: CN
Inventors: 沈俊勇; 张晓晖; 徐宇婷
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-01-05
Anticipated expiration: 2030-06-08

Abstract

The utility model discloses a middle-deep layer bushing type ground heat exchanger, ground heat exchanger includes the outer tube and is located the inner tube of outer tube, be formed with first cavity between outer tube and the inner tube, install a plurality of inlet tubes in the first cavity, be equipped with the water inlet that is linked together in the inlet tube on the outer tube, the upper end of inner tube is the delivery port, install first closing cap between the upper end of outer tube and the inner tube, first back cover is installed to the lower extreme of outer tube, install the second closing cap between the upper end of inlet tube and inner tube and the outer tube, install the second back cover between the lower extreme of inlet tube and inner tube and the outer tube. The utility model discloses reduced the total flow cross-sectional area of inlet tube, under the condition of same flow, increased the velocity of flow in the inlet tube, increased the inlet tube of a certain amount in the first cavity simultaneously, compared with prior art through the calculation and increased total heat transfer area, strengthened the heat transfer effect, strengthened bending strength in addition.

Description

Middle-deep sleeve type buried pipe heat exchanger

Technical Field

The utility model belongs to the technical field of the ground heat exchanger, concretely relates to deep layer bushing type ground heat exchanger.

Background

At present, the drilling depth of the heat exchanger of the middle-deep buried pipe is generally 1000-3000 m, and the exploitation of the geothermal energy of the middle-deep buried pipe is more suitable by using the sleeve-type heat exchanger of the buried pipe. The sleeve type buried pipe heat exchanger consists of an outer pipe and an inner pipe, wherein the outer pipe is generally a steel pipe, and the inner pipe is generally a plastic pipe. The other is to flow in from the annular flow passage between the inner and outer tubes and then out from the inner tube. With the increasing energy consumption and the progress and application of energy-saving technology, the requirements on the performance, heat exchange, structure and the like of a heat exchanger are higher and higher, the technical requirements on the heat exchange and structure of the conventional intermediate-deep buried pipe double pipe heat exchanger are further improved, the flow rate of water in an annular flow channel of the double pipe buried pipe heat exchanger is limited, and the heat exchange capacity is limited to a certain extent. In the middle-deep stratum, the outer pipe of the double-pipe type buried pipe heat exchanger is extruded by soil and is easy to bend and deform.

Therefore, in response to the above technical problems, there is a need to provide a deep-bed double pipe borehole heat exchanger.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a deep layer bushing type ground heat exchanger to solve foretell problem.

In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:

the utility model provides a deep layer bushing type ground heat exchanger, ground heat exchanger includes the outer tube and is located the inner tube of outer tube, be formed with first cavity between outer tube and the inner tube, install a plurality of inlet tubes in the first cavity, be equipped with the water inlet that is linked together in the inlet tube on the outer tube, the upper end of inner tube is the delivery port, install first closing cap between the upper end of outer tube and the inner tube, first back cover is installed to the lower extreme of outer tube, install the second closing cap between the upper end of inlet tube and inner tube and the outer tube, install the second back cover between the lower extreme of inlet tube and inner tube and the outer tube, the clearance has between second back cover and the first back cover, ground heat exchanger's circulation route is for passing through inlet tube and inner tube to delivery port from the water inlet.

In one embodiment, a second cavity is formed between the second cover and the second back cover in the first cavity, and the second cavity is filled with a filling agent.

In one embodiment, the water outlet is arranged at the upper part of the outer pipe.

In one embodiment, the water outlet is higher than the upper end of the water inlet pipe in level.

In one embodiment, the level of the upper end of the inner tube is higher than the level of the upper end of the outer tube.

In one embodiment, the lower end of the inner pipe has the same level as the lower end of the water inlet pipe.

In one embodiment, the outer diameter of the water inlet pipe is smaller than or equal to the distance between the inner wall of the outer pipe and the outer wall of the inner pipe.

In one embodiment, the inner tube is coaxially disposed with the outer tube.

In one embodiment, the water inlet pipes are uniformly distributed in the first cavity along the axial direction.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model reduces the total flow cross section area of the water inlet pipe, increases the flow velocity in the water inlet pipe under the condition of the same flow, increases a certain amount of water inlet pipes in the first cavity, increases the total heat exchange area compared with the prior art through calculation, and strengthens the heat exchange effect;

in addition, the structure adopts a porous double-ring structure of the cross section of the horsetail stem of the equisetum plant, the stem has excellent mechanical property, and the bending strength is enhanced by a double-T-shaped structure or a honeycomb sandwich structure which is commonly adopted in sandwich composite materials.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a front sectional view of a deep-bed double pipe type ground heat exchanger according to an embodiment of the present invention;

fig. 2 is a top sectional view of a deep tube in tube heat exchanger according to an embodiment of the present invention.

In the figure: 1. the water inlet pipe comprises an inner pipe, 2. an outer pipe, 3. a water inlet pipe, 4. a first sealing cover, 5. a first sealing bottom, 6. a second sealing cover, 7. a second sealing bottom, 8. a water inlet, 9. a water outlet and 10. a filling agent.

Detailed Description

The present invention will be described in detail below with reference to embodiments shown in the drawings. However, the present invention is not limited to the embodiments, and the structural, method, or functional changes made by those skilled in the art according to the embodiments are all included in the scope of the present invention.

The utility model discloses a middle deep layer bushing type ground heat exchanger in embodiment, it is shown with reference to fig. 1-2, ground heat exchanger includes outer tube 2 and is located inner tube 1 of outer tube 2, is formed with first cavity between outer tube 2 and the inner tube 1, installs a plurality of inlet tubes 3 in the first cavity, and is preferred, and inner tube 1 is the PE-RT material, and outer tube 2 and inlet tube 3 are steel material.

Specifically, referring to fig. 1, the upper end of the inner pipe 1 has a higher level than the upper end of the outer pipe 2, and the lower end of the inner pipe 1 has the same level as the lower end of the inlet pipe 3.

Referring to fig. 2, the outer diameter of the water inlet pipe 3 is smaller than or equal to the distance between the inner wall of the outer pipe 2 and the outer wall of the inner pipe 1, optimally, the outer diameter of the water inlet pipe 3 is equal to the distance between the inner wall of the outer pipe 2 and the outer wall of the inner pipe 1, the inner pipe 1 and the outer pipe 2 are coaxially arranged, and the water inlet pipe 3 is uniformly distributed in the first cavity along the axial direction.

Referring to fig. 1, the outer tube 2 is provided with a water inlet 8 communicated with the water inlet tube 3, the upper end of the inner tube 1 is provided with a water outlet 9, the water outlet 9 is arranged at the upper part of the outer tube 2, and the horizontal height of the water outlet 9 is higher than that of the upper end of the water inlet tube 3.

Install first closing cap 4 between the upper end of outer tube 2 and the inner tube 1, first back cover 5 is installed to the lower extreme of outer tube, installs second closing cap 6 between the upper end of inlet tube 3 and inner tube 1 and outer tube 2, installs second back cover 7 between the lower extreme of inlet tube 3 and inner tube 1 and outer tube 2.

Referring to fig. 2, a second cavity is formed between the second cover 6 and the second bottom 7 in the first cavity, and a filler 10 is filled in the second cavity, specifically, the filler 10 in this embodiment may be a magnesium oxide powder filler, and in other embodiments, a filler of another material may be used.

Referring to fig. 1, a gap is formed between the second back cover 7 and the first back cover 5, the gap can ensure the circulation of liquid, the flow path of the ground heat exchanger is from the water inlet 8 through the water inlet pipe 3 and the inner pipe 1 to the water outlet 9, the flow path can refer to the direction indicated by the arrow in fig. 1, the water which fully absorbs heat is utilized from the lower part of the inner pipe 1 made of PE-RT material through the water outlet 9, and thus the purpose and effect of the present invention are achieved.

Specifically, in the present embodiment, the outer diameter of the outer tube 2 is 0.2 m, the inner diameter is 0.188 m, and the wall thickness is 0.006 m; the outer diameter of the inner pipe 1 is 0.14 meter, the inner diameter is 0.124 meter, and the wall thickness is 0.008 meter; the outer diameter of the water inlet pipe 3 is 0.024 m, the inner diameter is 0.016 m, and the wall thickness is 0.004 m. In this embodiment, 20 water inlet pipes 3 are arranged in the first cavity, and in other embodiments, the sizes of the outer pipe and the inner pipe and the number of the water inlet pipes can be designed as required, and are not described in detail herein.

Based on above-mentioned specification parameter, compare with current deep layer bushing type buried pipe heat exchanger, the utility model discloses the area of contact of water and pipe wall increases 70.2% when entrying, and the flow cross-sectional area of intaking reduces 67.5%, and under the condition of same circulating water flow, the velocity of flow increases 207.5% in inlet tube 3, and the inlet tube 3 water-logging is in turbulent state, and reynolds number Re increases 2.51%, and Nu seoul number Nu increases 2.00%, and the heat convection coefficient increases for current deep layer bushing type buried pipe heat exchanger's 3.06 times, under the condition of same heat transfer condition, the utility model discloses a heat convection volume increases 4.208 times.

Compare with current deep layer bushing type ground heat exchanger, the utility model discloses ground heat exchanger's compressive strength can improve 20% at least.

According to the technical scheme provided by the utility model, the utility model discloses following beneficial effect has:

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a deep layer bushing type ground heat exchanger, its characterized in that, ground heat exchanger includes the outer tube and is located the inner tube of outer tube, be formed with first cavity between outer tube and the inner tube, install a plurality of inlet tubes in the first cavity, be equipped with the water inlet that is linked together in the inlet tube on the outer tube, the upper end of inner tube is the delivery port, install first closing cap between the upper end of outer tube and the inner tube, first back cover is installed to the lower extreme of outer tube, install the second closing cap between the upper end of inlet tube and inner tube and the outer tube, install the second back cover between the lower extreme of inlet tube and inner tube and the outer tube, the clearance has between second back cover and the first back cover, ground heat exchanger's circulation route is for passing through inlet tube and inner tube to delivery port from the water inlet.

2. A buried pipe heat exchanger of the type set forth in claim 1, wherein a second cavity is formed in the first cavity between the second cover and the second back cover, the second cavity being filled with a filler.

3. A deep pipe in ground heat exchanger according to claim 1 wherein the water outlet is provided in an upper portion of the outer pipe.

4. A deep pipe heat exchanger according to claim 1 wherein the level of the water outlet is higher than the level of the upper end of the water inlet pipe.

5. A deep pipe in ground heat exchanger according to claim 1 wherein the level of the upper end of the inner pipe is higher than the level of the upper end of the outer pipe.

6. A deep pipe heat exchanger according to claim 1 wherein the level of the lower end of the inner pipe is the same as the level of the lower end of the inlet pipe.

7. A deep pipe in ground heat exchanger according to claim 1 wherein the outer diameter of the inlet pipe is less than or equal to the distance between the inner wall of the outer pipe and the outer wall of the inner pipe.

8. A deep pipe heat exchanger according to claim 1, wherein the inner pipe is disposed coaxially with the outer pipe.

9. A deep pipe heat exchanger according to claim 1 wherein the water inlet pipes are evenly distributed in the first cavity in the axial direction.