Nested tube type graphene heat exchanger

Abstract

The utility model relates to a nested pipe type graphene heat exchanger which comprises a heat source inner pipe, a cold source outer pipe connected to the heat source inner pipe in a sleeving mode, a rotating pipe connector and an arc-shaped heat dissipation flow guide assembly which surrounds the periphery of the inner wall face of the cold source outer pipe in a nested mode. The arc-shaped heat dissipation flow guide assembly comprises an arc-shaped lining layer and flow guide column arrays which are inserted into the surface of the arc-shaped lining layer and are distributed in a staggered mode, the surface of the heat source inner pipe is evenly coated with a water-based graphene coating, and the water-based graphene coating is coated with a water-based epoxy resin layer; the heat exchanger has the advantages that the arc-shaped heat dissipation flow guide assembly enables cooling liquid on the inner bottom layer of the cold source outer pipe to flow around, the flow conversion effect between liquid layers of the cooling liquid is enhanced, and then the heat exchange efficiency is improved; the water-based graphene coating can enhance the heat dissipation effect of the pipe wall of the heat source inner pipe, and meanwhile the water-based epoxy resin layer is coated on the surface of the heat source inner pipe, so that the service life of the water-based graphene coating can be effectively prolonged, and the pipe wall adhesion effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a nested tube type graphene heat exchanger. Background Art

[0002] The tubular heat exchanger is a concentric sleeve made of two standard tubes of different sizes. The outer side is called the shell side, and the inner side is called the tube side. The two different media can flow in the shell side and the tube side in reverse (or in the same direction) to achieve the effect of heat exchange. In the existing tubular heat exchanger, the refrigerant medium often has poor fluidity due to low pressure in the outer tube, resulting in low heat exchange efficiency; at the same time, the heat transfer efficiency is poor in the process of heat transfer from the inner tube to the outer tube, especially after the tube wall is scaled, the heat transfer is blocked, and the product maintenance is difficult, resulting in a shortened service life. Utility Model Content

[0003] The purpose of the utility model is to solve the above-mentioned defects and provide a nested tube graphene heat exchanger which can effectively improve the heat exchange efficiency.

[0004] To achieve the above purpose, the technical solution of the utility model is as follows:

[0005] A nested tube graphene heat exchanger comprises a heat source inner tube, a cold source outer tube sleeved on the heat source inner tube, and a rotating tube joint, characterized in that an arc-shaped heat dissipation and flow guide component is nested around the inner wall surface of the cold source outer tube, the arc-shaped heat dissipation and flow guide component comprises an arc-shaped lining and an array of flow guide columns inserted on the surface of the arc-shaped lining and distributed in a staggered manner, a water-based graphene coating is evenly coated on the surface of the heat source inner tube, and a water-based epoxy resin layer is coated on the water-based graphene coating.

[0006] Furthermore, the water-based graphene coating is prepared from a graphene slurry prepared by a physical method and an aqueous dispersant, wherein the aqueous dispersant can be one or more combinations of polyvinyl pyrrolidone, polysorbate 80, anhydrous ethanol, sodium cholate, sodium dodecylbenzene sulfonate, and polyvinyl alcohol.

[0007] As a preferred technical solution, one end of the arc-shaped lining is connected to a flexible joint, and the flexible joint is cooperatively connected to one end of a rotating pipe joint.

[0008] Furthermore, the flexible joint and the rotating pipe joint are connected in a detachable manner, and multiple heat source inner tubes are spliced ​​through the rotating pipe joint.

[0009] As a preferred technical solution, the guide column array is composed of several groups of guide columns with different lengths, and the length of each guide column is equal to one quarter to three quarters of the cross-sectional width between the heat source inner tube and the cold source outer tube.

[0010] As a preferred technical solution, a plurality of leakage holes are longitudinally distributed on the guide column, and the aperture of each leakage hole decreases successively as it approaches the outer wall end of the inner tube of the heat source, wherein the minimum aperture of the leakage hole is 0.2cm-0.8cm and the maximum aperture is 1cm-3cm.

[0011] Furthermore, because the aperture of the leakage hole at the bottom of the guide column is smaller than that of the leakage hole at the upper end, and the arrays of guide columns are staggered, the coolant in the outer tube of the cold source forms a bypass flow when flowing through the guide column, and the flow exchange effect between the liquid layers is enhanced.

[0012] As a preferred technical solution, the surface of the arc-shaped lining is provided with a plurality of arc-shaped slots which cooperate with the guide columns. The guide columns and the arc-shaped slots are detachably connected via a clamping cap. The inclination angle of the contact end of the guide columns and the arc-shaped lining is 20°-35°.

[0013] As a preferred technical solution, the thickness of the water-based graphene coating is 50 μm-100 μm, and the thickness of the water-based epoxy resin layer is 80-120 μm.

[0014] The beneficial effects of the utility model are as follows: 1. The setting of the arc-shaped heat dissipation guide component enables the bottom layer of coolant in the outer tube of the cold source to form a circumferential flow, thereby enhancing the exchange effect between the liquid layers of the coolant and thus improving the heat exchange efficiency. 2. The water-based graphene coating can enhance the heat dissipation effect of the wall of the inner tube of the heat source, and coating the surface with a water-based epoxy resin layer can effectively extend the service life of the water-based graphene coating and improve the wall adhesion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a nested tube graphene heat exchanger of the utility model;

[0016] Figure 2 This is a front cross-sectional view of a nested tube graphene heat exchanger of the utility model.

[0017] In the figure: 10-heat source inner tube, 20-cold source outer tube, 30-swivel joint, 40-arc heat dissipation guide component, 41-arc lining, 41-1-arc slot, 42-guide column, 50-water-based graphene coating, 60-water-based epoxy resin layer, 70-flexible joint, 80-leakage hole, 90-cap. Implementation

[0018] In order to have a further understanding and recognition of the structural features and the effects achieved by the utility model, a preferred embodiment and drawings are used to provide a detailed description as follows:

[0019] The utility model embodiment provides a nested tube graphene heat exchanger, such as Figure 1-2As shown, the heat exchanger includes a heat source inner tube 10, a cold source outer tube 20 sleeved on the heat source inner tube, and a rotating pipe joint 30. An arc-shaped heat dissipation guide component 40 is nested around the inner wall surface of the cold source outer tube 20. The arc-shaped heat dissipation guide component 40 includes an arc-shaped lining 41 and an array of guide columns inserted on the surface of the arc-shaped lining 41 and distributed in a staggered manner. A water-based graphene coating 50 is evenly coated on the surface of the heat source inner tube 10, and a water-based epoxy resin layer 60 is coated on the water-based graphene coating 50.

[0020] In this embodiment, a flexible joint 70 is connected to one end of the arc-shaped lining 41 , and the flexible joint 70 is matched and connected to one end of the rotating pipe joint 30 .

[0021] In this embodiment, the guide column array is composed of a plurality of groups of guide columns 42 with different lengths, and the length of each guide column 42 is equal to one quarter to three quarters of the cross-sectional width between the heat source inner tube 10 and the cold source outer tube 20 .

[0022] In this embodiment, a plurality of leakage holes 80 are longitudinally distributed on the guide column 42, and the aperture of each leakage hole 80 decreases successively as it approaches the outer wall end of the heat source inner tube 10, wherein the minimum aperture of the leakage hole 80 is 0.2cm-0.8cm, and the maximum aperture is 1cm-3cm.

[0023] In this embodiment, a plurality of arc-shaped slots 41-1 are provided on the surface of the arc-shaped lining 41 to cooperate with the guide column 42. The guide column 42 and the arc-shaped slots 41-1 are detachably connected via a clamping cap 90. The inclination angle of the contact end of the guide column 42 and the arc-shaped lining 41 is 20°-35°.

[0024] In this embodiment, the thickness of the water-based graphene coating 50 is 50 μm-100 μm, and the thickness of the water-based epoxy resin layer 60 is 80-120 μm.

[0025] The specific working principle is: multiple heat source inner tubes 10 can be spliced ​​together through a rotating pipe joint 30. Since the arc-shaped heat dissipation component 40 is embedded in the wall of the cold source outer tube 20 through a flexible joint 70, cleaning is more convenient. At the same time, the water-based epoxy resin layer 60 can effectively enhance the adhesion of the water-based graphene coating 50 to the wall of the heat source inner tube 10, and the effective service life is further improved; the cooling water in the heat source outer tube 20 forms a bypass when flowing through the guide column 42, and the exchange effect between the liquid layers is enhanced, thereby improving the heat exchange efficiency.

[0026] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications to the shapes, structures, features and spirits described in the claims of the present invention should be included in the claims of the present invention.

Claims

1. A nested tube graphene heat exchanger, comprising a heat source inner tube, a cold source outer tube sleeved on the heat source inner tube, and a rotating tube joint, characterized in that: An arc-shaped heat dissipation guide component is nested around the inner wall surface of the cold source outer tube, and the arc-shaped heat dissipation guide component includes an arc-shaped lining and an array of guide columns inserted on the surface of the arc-shaped lining and distributed in a staggered manner. A water-based graphene coating is evenly coated on the surface of the heat source inner tube, and a water-based epoxy resin layer is coated on the water-based graphene coating.

2. The nested tube graphene heat exchanger according to claim 1, characterized in that: One end of the arc-shaped lining is connected with a flexible joint, and the flexible joint is matched and connected with one end of a rotating pipe joint.

3. The nested tube graphene heat exchanger according to claim 2, characterized in that: The guide column array is composed of a plurality of groups of guide columns with different lengths, and the length of each guide column is equal to one quarter to three quarters of the cross-sectional width between the heat source inner tube and the cold source outer tube.

4. The nested tube graphene heat exchanger according to claim 3, characterized in that: A plurality of leakage holes are longitudinally distributed on the guide column, and the aperture of each leakage hole decreases successively near the outer wall end of the inner tube of the heat source, wherein the minimum aperture of the leakage hole is 0.2cm-0.8cm, and the maximum aperture is 1cm-3cm.

5. The nested tube graphene heat exchanger according to claim 1, characterized in that: The surface of the arc-shaped lining is provided with a plurality of arc-shaped slots which are connected with the guide column. The guide column and the arc-shaped slot are detachably connected via a card cap. The inclination angle of the contact end of the guide column and the arc-shaped lining is 20°-35°.

6. The nested tube graphene heat exchanger according to claim 1, characterized in that: The thickness of the water-based graphene coating is 50 μm-100 μm, and the thickness of the water-based epoxy resin layer is 80-120 μm.

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