Heat preservation device for heat exchange tube of ground source heat pump

Abstract

The utility model relates to the technical field of ground source heat pumps, and discloses a heat preservation device for a heat exchange tube of a ground source heat pump, which comprises a shell with an inner cavity, and a plurality of axial through holes for a U-shaped heat exchange tube to penetrate through are respectively formed in the top and the bottom of the shell; the at least one support is arranged in the inner cavity, and the periphery of the support is in interference fit with the inner wall of the inner cavity of the shell; the support is provided with at least two channels used for allowing the U-shaped heat exchange tubes to penetrate through. And the thermal insulation material is filled in the inner cavity. According to the heat preservation device, heat exchange between the U-shaped heat exchange pipe and a frozen soil layer can be isolated, the heat loss of the ground source heat pump system is reduced, and the economic benefits of the system are improved; the built-in support can position and fix the U-shaped heat exchange pipe, pipeline position dislocation is avoided, and installation and operation are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of ground source heat pumps, in particular to a heat preservation device for a heat exchange pipe of a ground source heat pump. Background Art

[0002] The heat exchange ground source heat pump system makes comprehensive use of shallow geothermal energy and heat pump technology, and is usually used in the fields of preparing hot water, hot air, clean heating, etc. Generally, a U-shaped pipe is inserted into the ground, and a circulating working medium is set in the pipe to complete the heat exchange.

[0003] Due to the vast territory of my country, in some extremely cold areas, the permafrost layer is relatively thick and the temperature is very low. When the U-shaped heat exchange tube passes through the permafrost layer, the circulating fluid in the tube will release heat energy to the permafrost layer, causing a certain degree of heat loss, thereby reducing the energy efficiency of the entire system and causing its economic value to decline to a certain extent. Utility Model Content

[0004] Based on the technical problems in the prior art, the utility model provides an insulation device for a ground source heat pump heat exchange tube, which has a simple structure and is easy to install and operate. It can isolate the heat exchange between the heat exchange tube and the external environment and reduce the heat loss of the ground source heat pump system.

[0005] The utility model provides a heat preservation device for a heat exchange pipe of a ground source heat pump, comprising:

[0006] A shell having an inner cavity, wherein the top and bottom of the shell are respectively provided with a plurality of axial through holes for the U-shaped heat exchange tube to pass through;

[0007] At least one bracket is arranged in the inner cavity, and the bracket is interference-fitted with the inner wall of the inner cavity of the shell on all sides; the bracket is provided with at least two channels for passing the U-shaped heat exchange tube;

[0008] The heat-insulating material is filled in the inner cavity.

[0009] In some embodiments, the support comprises:

[0010] Outer ring;

[0011] At least one inner connecting part, both ends of the inner connecting part are connected to the outer ring part; the two ends of the inner connecting part are respectively provided with axially penetrating channels; the outer ring part connected to the inner connecting part is provided with a first opening, and the first opening is connected to the channel.

[0012] In some embodiments, a hollow portion is formed between the inner connecting portion and the inner wall of the outer ring portion, a second opening is provided on the outer ring portion between adjacent first openings, and the second opening is connected to the hollow portion.

[0013] In some embodiments, the inner connecting portion is formed with a surrounding wall portion surrounding the channel along the axial direction, and the surrounding wall portion is in contact with the tube wall of the U-shaped heat exchange tube.

[0014] In some embodiments, two inner connecting parts are provided, and the two inner connecting parts are cross-connected at the center position of the outer ring part.

[0015] In some embodiments, the radial cross-section of the housing is circular.

[0016] In some embodiments, the bottom of the housing is a conical structure.

[0017] In some embodiments, the shell includes an end cover and a lower shell, and the end cover and the lower shell are fixedly connected by a snap-fit ​​structure.

[0018] Compared with the prior art, the advantages and positive effects of the utility model are:

[0019] The above-mentioned insulation device for the heat exchange tube of the ground source heat pump can isolate the heat exchange between the U-shaped heat exchange tube and the frozen soil layer, reduce the heat loss of the ground source heat pump system, and improve the economic benefits of the system; wherein, the built-in bracket can position and fix the U-shaped heat exchange tube to avoid misalignment of the pipeline position, and the installation operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the assembly structure of the heat preservation device for the heat exchange tube of the ground source heat pump of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of the heat preservation device for the heat exchange pipe of the ground source heat pump of the utility model;

[0023] Figure 3 It is a structural schematic diagram of a shell in a heat preservation device for a heat exchange tube of a ground source heat pump according to the utility model;

[0024] Figure 4 This is a schematic structural diagram of a bracket in a heat preservation device for a heat exchange tube of a ground source heat pump according to the utility model;

[0025] Figure 5 It is a front view of a bracket in a heat preservation device for a heat exchange tube of a ground source heat pump according to the utility model;

[0026] Description of reference numerals:

[0027] Shell 1; lower shell 11; end cover 12; axial through hole 13; conical structure 14;

[0028] Bracket 2; outer ring portion 21; inner connecting portion 22; channel 23; first opening 24; second opening 25; hollow portion 26; surrounding wall portion 27;

[0029] U-shaped heat exchange tube 3. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0034] Reference Figure 1-Figure 5, which is an embodiment of the utility model for the heat preservation device of the ground source heat pump heat exchange tube, the heat preservation device is installed on the U-shaped heat exchange tube 3 (only part of the tube body of the U-shaped heat exchange tube 3 is shown in the figure).

[0035] The heat preservation device comprises a shell 1 , a bracket 2 arranged in the shell 1 , and a heat preservation material (not shown).

[0036] The shell 1 has an inner cavity. The top and bottom of the shell 1 are respectively provided with a plurality of axial through holes 13 for the U-shaped heat exchange tube 3 to pass through. Specifically, the shell 1 includes a lower shell 11 and an end cover 12 covered on the lower shell 11.

[0037] At least one bracket 2 is disposed in the inner cavity. The bracket 2 is interference-fitted with the inner wall of the inner cavity of the shell 1 to fix the bracket 2 in the shell 1. The bracket 2 is provided with at least two channels 23 for passing the U-shaped heat exchange tube 3.

[0038] The heat-insulating material is filled in the inner cavity of the shell 1 .

[0039] The installation process of the thermal insulation device is specifically as follows: first, insert the two sections of the U-shaped heat exchange tube 3 into the lower shell 11 along the axial through hole 13; then, pass the bracket 2 through the U-shaped heat exchange tube 3 and place it in the shell 1 to position the U-shaped heat exchange tube 3; then, fill and inject thermal insulation material, such as polyurethane foam material, into the inner cavity of the shell 1; finally, fix the end cover 12 to the lower shell 11.

[0040] The above-mentioned insulation device for the ground source heat pump heat exchange tube can isolate the heat exchange between the U-shaped heat exchange tube 3 and the frozen soil layer, reduce the heat loss of the ground source heat pump system, and improve the economic benefits of the system; wherein, the built-in bracket 2 can position and fix the U-shaped heat exchange tube 3 to avoid misalignment of the pipeline position, and the installation operation is convenient.

[0041] In this embodiment, see Figure 3 , is a schematic structural diagram of the housing 1.

[0042] The radial cross-section of the shell 1 is preferably circular, and the cylindrical structure can reduce the volume of the shell 1. At the same time, the outer wall of the shell 1 is a circular surface to facilitate insertion into the frozen soil layer.

[0043] Furthermore, the bottom of the shell 1 is configured as a conical structure 14, and the conical structure 14 can facilitate the shell 1 to be inserted into the ground with less resistance.

[0044] The material of the housing 1 can be metal or polymer material. The metal material is preferably stainless steel which is not easy to rust.

[0045] The housing 1 specifically includes a lower housing 11 and an end cover 12. The end cover 12 is disposed on the end of the lower housing 11 and can be fixedly connected to the lower housing 11 through a snap-fit ​​structure. Alternatively, the end cover 12 and the lower housing 11 are bonded and fixed. When the housing 1 is made of metal material, the end cover 12 can be fixed to the lower housing 11 by welding.

[0046] The axial through hole 13 is formed on the end cover 12 and the bottom end of the lower shell 11. The axial through holes 13 on the end cover 12 and the lower shell 11 are coaxially arranged to pass through the same U-shaped heat exchange pipe section.

[0047] In this embodiment, see Figure 4 , is a schematic structural diagram of the bracket 2.

[0048] The bracket 2 is an integral structural member, including an outer ring portion 21 and at least one inner connecting portion 22 .

[0049] The inner connecting portion 22 is located inside the outer ring portion 21 . Both ends of the inner connecting portion 22 are connected to the outer ring portion 21 .

[0050] Axially penetrating channels 23 are respectively provided at the two ends of the inner connecting portion 22 for passing through the two sections of the U-shaped heat exchange tube 3 .

[0051] The outer ring portion 21 connected to the inner connecting portion 22 is provided with a first opening 24 , and the first opening 24 is communicated with the channel 23 .

[0052] The design of the first opening 24 ensures that a certain clearance margin is reserved for the outer diameter of the outer ring portion 21, so that the outer ring portion 21 can form a stable interference fit connection with the inner cavity wall of the shell 1. At the same time, the structure of the first opening 24 also allows the inner diameter of the channel 23 to be appropriately expanded, which facilitates the smooth insertion and installation of the U-shaped heat exchange tube 3.

[0053] In this embodiment, a hollow portion 26 is formed between the inner connecting portion 22 and the inner wall of the outer ring portion 21 , and a second opening 25 is opened on the outer ring portion 21 between adjacent first openings 24 , and the second opening 25 is communicated with the hollow portion 26 .

[0054] The second opening 25 further increases the outer diameter clearance margin of the outer ring portion 21, thereby improving the fit tightness between the bracket 2 and the shell 1; at the same time, adding the second opening 25 can cause the bracket 2 to produce a larger torsional deformation, facilitating the smooth insertion and installation of the U-shaped heat exchange tube 3.

[0055] In this embodiment, two inner connecting parts 22 are provided, and the two inner connecting parts 22 are cross-connected at the center position of the outer ring part 21, which can be applicable to single U-shaped heat exchange tube 3 and double U-shaped heat exchange tube 3, and has strong versatility.

[0056] The inner connection portion 22 is formed with a surrounding wall portion 27 surrounding the channel 23 along the axial direction, and the surrounding wall portion 27 is in contact with the tube wall of the U-shaped heat exchange tube 3 .

[0057] The surrounding wall portion 27 can clamp the tube body of the U-shaped heat exchange tube 3 , thereby preventing the bracket 2 from moving back and forth on the U-shaped heat exchange tube 3 along the axial direction.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A heat preservation device for a heat exchange tube of a ground source heat pump, characterized in that: include: A shell having an inner cavity, wherein the top and bottom of the shell are respectively provided with a plurality of axial through holes for the U-shaped heat exchange tube to pass through; At least one bracket is arranged in the inner cavity, and the bracket is interference-fitted with the inner wall of the inner cavity of the shell on all sides; the bracket is provided with at least two channels for passing the U-shaped heat exchange tube; The heat-insulating material is filled in the inner cavity.

2. The heat preservation device for the heat exchange tube of a ground source heat pump according to claim 1, characterized in that: The support comprises: Outer ring; At least one inner connecting part, both ends of the inner connecting part are connected to the outer ring part; the two ends of the inner connecting part are respectively provided with axially penetrating channels; the outer ring part connected to the inner connecting part is provided with a first opening, and the first opening is connected to the channel.

3. The heat preservation device for the heat exchange tube of a ground source heat pump according to claim 2, characterized in that: A hollow portion is formed between the inner connecting portion and the inner wall of the outer ring portion, and a second opening is provided on the outer ring portion between adjacent first openings, and the second opening is communicated with the hollow portion.

4. The heat preservation device for the heat exchange pipe of a ground source heat pump according to claim 2 or 3, characterized in that: The inner connecting portion is formed with a surrounding wall portion surrounding the channel along the axial direction, and the surrounding wall portion is in contact with the tube wall of the U-shaped heat exchange tube.

5. The heat preservation device for the heat exchange pipe of a ground source heat pump according to claim 2 or 3, characterized in that: The inner connecting parts are provided with two, and the two inner connecting parts are cross-connected at the center position of the outer ring part.

6. The heat preservation device for the heat exchange tube of a ground source heat pump according to claim 1, characterized in that: The radial cross section of the housing is circular.

7. The heat preservation device for the heat exchange tube of a ground source heat pump according to claim 1, characterized in that: The bottom of the shell is a conical structure.

8. The heat preservation device for the heat exchange tube of a ground source heat pump according to claim 1, characterized in that: The shell comprises an end cover and a lower shell, and the end cover and the lower shell are fixedly connected via a snap-fit ​​structure.

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