All-glass metal heat pipe direct insertion type solar vacuum heat collecting pipe

Abstract

The utility model belongs to the technical field of evacuated collector tubes, and discloses an all-glass metal heat tube direct insertion type solar evacuated collector tube. The vacuum heat collecting tube comprises a full-glass transparent vacuum tube inner tube and a full-glass transparent vacuum tube outer tube, wherein the outer walls of the inner tube and the outer tube are not plated with heat absorption film layers; one end of the inner tube of the all-glass transparent vacuum tube is closed up and connected with the inner wall of the outer tube of the all-glass transparent vacuum tube in a supporting mode through a support, and the other end of the inner tube of the all-glass transparent vacuum tube is sealed with a port of the outer tube of the all-glass transparent vacuum tube in a melting mode. The evacuated tail nozzle of the outer tube of the all-glass transparent vacuum tube is cut off and sintered to be sealed; the full-glass transparent vacuum tube inner tube is filled with nitrogen and then is provided with a strip heat tube assembly; the strip heat pipe assembly and the full-glass transparent vacuum pipe inner pipe are sealed through sealant. The utility model solves the problems of large glass conduction heat resistance, low heat transfer efficiency, serious heat efficiency attenuation and the like, and has the characteristic of high heat collection efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum heat collecting tubes, and in particular relates to a full-glass metal heat pipe straight-insertion type solar vacuum heat collecting tube. Background Art

[0002] The structure of the existing all-glass direct-insert heat pipe type vacuum tube is: a metal heat-absorbing fin is placed close to the inner wall of the inner tube of the all-glass solar vacuum collector tube, and a heat pipe is installed in the center of the fin to conduct heat. The main problems of this all-glass direct-insert heat pipe type vacuum tube are: the overall heat transfer efficiency of the vacuum tube is low; the heat transfer efficiency of the vacuum tube is seriously attenuated after a period of use. The absorption film layer of the all-glass direct-insert heat pipe type vacuum tube is on the outer wall of the inner tube of the double-layer glass tube. The absorption film layer converts light into heat and then transfers it to the metal heat-absorbing fin placed close to the inner wall of the inner tube of the all-glass solar vacuum collector tube through the inner tube of the double-layer glass tube (glass has large thermal resistance). The fin then transfers the heat to the heat pipe installed in the center of the fin, and the heat pipe transfers the heat to the working medium that the user needs to heat.

[0003] Through the above analysis, the problems and defects of the existing technology are: the existing technology has large thermal resistance of glass, low heat transfer efficiency and serious thermal efficiency attenuation. Utility Model Content

[0004] In order to overcome the problems existing in the related art, the disclosed embodiment of the utility model provides an all-glass metal heat pipe straight-insertion type solar vacuum collector tube and a design method.

[0005] The technical solution is as follows: an all-glass metal heat pipe direct-insertion solar vacuum heat collecting tube, comprising:

[0006] All-glass transparent vacuum tube inner tube and all-glass transparent vacuum tube outer tube whose outer walls are not coated with heat-absorbing film;

[0007] The space between the inner tube of the all-glass transparent vacuum tube and the outer tube of the all-glass transparent vacuum tube is evacuated and sealed by cutting off and fusing the evacuation tail nozzle of the outer tube of the all-glass transparent vacuum tube;

[0008] The inner tube of the all-glass transparent vacuum tube is filled with nitrogen and then equipped with a strip heat pipe assembly;

[0009] The strip heat pipe assembly is sealed with the inner tube of the all-glass transparent vacuum tube by means of sealant.

[0010] Furthermore, the strip heat pipe assembly comprises: a strip with a heat absorbing film layer and a heat pipe; the strip with the heat absorbing film layer and the heat pipe are connected to each other by welding or cold extrusion and assembled into one.

[0011] Furthermore, the strip with the heat absorbing film layer is provided with deep grooves;

[0012] Furthermore, the shape of the strip with the heat absorbing film layer includes straight lines, twill lines, or a combination of the two.

[0013] Furthermore, when the strip with the heat absorbing film layer is in the shape of straight lines, the strip with the heat absorbing film layer in the shape of straight lines is connected on both sides of the heat pipe by welding or cold extrusion.

[0014] Furthermore, when the strip with the heat absorbing film layer is in a twill shape, the two sides of the heat pipe are connected by welding or cold extrusion to connect the strip with the heat absorbing film layer in a twill shape.

[0015] Furthermore, when the strips with the heat-absorbing film layer are a combination of straight grain and twill grain, one side of the heat pipe is connected to the strips with the heat-absorbing film layer in a straight grain shape by welding or cold extrusion, and the other side is connected to the strips with the heat-absorbing film layer in a twill grain shape by welding or cold extrusion.

[0016] Combining all the above technical solutions, the beneficial effects of the utility model are as follows: the utility model solves the problems of large thermal conduction resistance of glass, low heat transfer efficiency, serious thermal efficiency attenuation, etc., and has the characteristic of high heat collection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure;

[0018] Figure 1 This is a schematic diagram of an all-glass metal heat pipe straight-insertion solar vacuum heat collection tube provided by an embodiment of the utility model;

[0019] Figure 2 It is a planar schematic diagram of a strip with a heat absorbing film layer in a strip heat pipe assembly provided by an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of a semicircular curved surface of a strip having a heat absorbing film layer in a strip heat pipe assembly provided by an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of a strip with a heat-absorbing film layer provided by an embodiment of the utility model being a full circular curved surface;

[0022] Figure 5 The shape of the strip of the heat-absorbing film layer provided by the embodiment of the utility model adopts a schematic diagram of straight lines;

[0023] Figure 6 It is a schematic diagram of the shape of the strip of the heat-absorbing film layer provided by the embodiment of the utility model using a twill pattern;

[0024] In the figure: 1. All-glass transparent vacuum tube inner tube; 2. All-glass transparent vacuum tube outer tube; 3. Strip heat pipe assembly; 301. Strip with heat absorbing film layer; 302. Heat pipe; 303. Deep groove; 4. Vacuum tail nozzle. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0026] The innovation of the utility model is that a metal heat absorbing and heat transferring component with a high-efficiency absorption layer is used to replace the glass metal heat absorbing and heat transferring component to improve the heat transfer efficiency and reduce the heat loss.

[0027] Embodiment 1, as Figure 1-Figure 6 As shown, the all-glass metal heat pipe straight-insertion solar vacuum collector provided by the embodiment of the utility model adopts an all-glass vacuum tube in which both the all-glass transparent vacuum tube inner tube 1 and the all-glass transparent vacuum tube outer tube 2 are not coated with a heat-absorbing film layer, wherein the outer wall of the all-glass transparent vacuum tube inner tube 1 is not coated, and the all-glass transparent vacuum tube inner tube 1 and the all-glass transparent vacuum tube outer tube 2 are evacuated;

[0028] A strip heat pipe assembly 3 is assembled inside the inner tube 1 of the all-glass transparent vacuum tube. The strip heat pipe assembly 3 is assembled from a strip 301 with a heat absorbing film layer and a heat pipe 302;

[0029] The strip 301 with the heat absorbing film layer and the heat pipe 302 are assembled in the following ways:

[0030] Welding or cold extrusion. After the strip heat pipe assembly 3 and the all-glass transparent vacuum tube inner tube 1 are assembled, nitrogen is filled into the inner space of the all-glass transparent vacuum tube inner tube 1, and the tube mouth of the all-glass transparent vacuum tube inner tube 1 is sealed with a sealant. After the space between the all-glass transparent vacuum tube inner tube 1 and the all-glass transparent vacuum tube outer tube 2 is evacuated, the evacuation tail nozzle 4 of the all-glass transparent vacuum tube outer tube 2 is cut off and sintered to seal.

[0031] When the surface of the strip 301 with the heat absorbing film layer in the strip heat pipe assembly 3 absorbs heat under light, the temperature of the strip 301 with the heat absorbing film layer rises, and at the same time, infrared heat is radiated outward. After the deep groove 303 is prefabricated on the surface of the strip 301 with the heat absorbing film layer, most of the infrared heat radiated outward from the surface of the strip 301 with the heat absorbing film layer will be radiated to the metal surface of the deep groove 303, thus minimizing the heat loss absorbed by the strip 301 with the heat absorbing film layer. The deep grooves are provided on the strip to increase the illumination area.

[0032] The shape of the strip 301 of the heat absorbing film layer includes straight lines, twill lines, or a combination of the two;

[0033] The overall shape formed by the strips with heat-absorbing film layer, which are one of straight lines, diagonal lines or a combination of both, surrounding the heat pipe is one of a plane, a semicircular curved surface or a full circular curved surface. Figure 2 , Figure 3 , Figure 4 shown.

[0034] As a preferred embodiment of the present invention, in the strip heat pipe assembly 3, the two sides of the heat pipe 302 are connected by welding or cold extrusion to form a strip 301 with a heat absorbing film layer in a straight grain shape; Figure 5 ;

[0035] As a preferred embodiment of the present invention, in the strip heat pipe assembly 3, the two sides of the heat pipe 302 are connected by welding or cold extrusion to form a strip 301 with a heat absorbing film layer in a twill shape; Figure 6 ;

[0036] As a preferred embodiment of the present invention, in the strip heat pipe assembly 3, one side of the heat pipe 302 is connected to the strip 301 of the heat absorbing film layer with a straight grain shape by welding or cold extrusion, and the other side is connected to the strip 301 of the heat absorbing film layer with a twill grain shape by welding or cold extrusion.

[0037] In the embodiment of the utility model, the nitrogen filling in the all-glass transparent vacuum tube has the following functions:

[0038] Isolate from air, after the heat-absorbing film layer on the surface of the strip 301 with the heat-absorbing film layer is used for a long time under atmospheric conditions, the heat-absorbing film layer material on the surface will react with the oxygen in the air to generate new substances, reducing the heat absorption efficiency of the strip film layer. Nitrogen is the best protective gas, and it does not react with the heat-absorbing film layer on the surface of the strip 301 with the heat-absorbing film layer in high or low temperature environments, thereby ensuring the efficient absorption of the heat-absorbing film layer for a long time.

[0039] Fast heat transfer: The thermal conductivity of air glass, aluminum and metal are 0.026W / mk, 0.7W / mk and 204W / mk respectively. Theoretically, the thermal conductivity of the all-glass heat collector with inserted heat pipe is poor, the aluminum sheet is difficult to be in close contact with the glass, the thermal conductivity of glass and air is poor, and there is no direct heat absorption of metal, so the heat transfer efficiency is high and the heat transfer is fast.

[0040] The utility model solves the problems of large glass conduction heat resistance, low heat transfer efficiency, serious thermal efficiency attenuation, etc.

[0041] The manufacturing method of the all-glass metal heat pipe direct-insertion solar vacuum heat collecting tube provided by the embodiment of the utility model is as follows:

[0042] Based on computer software, a simulation model of an initial strip heat pipe assembly composed of a strip 301 with a heat absorbing film layer and a heat pipe is constructed, and a deep groove is opened on the strip 301 with a heat absorbing film layer;

[0043] The strip 301 with the heat absorbing film layer has a shape of straight lines, twill lines, or a combination of the two;

[0044] The overall shape formed by the strip 301 with a heat-absorbing film layer, which is one of straight lines, diagonal lines, or a combination of both, surrounding the heat pipe 302 is one of a plane, a semicircular curved surface, and a full circular curved surface.

[0045] When optimizing the surface heat absorption of the strip 301 with the heat absorption film layer, the state when the infrared radiation heat to the deep groove is the maximum is obtained, the best shape of the strip 301 with the heat absorption film layer is obtained, and finally the optimal strip heat pipe assembly simulation model is obtained;

[0046] Based on the obtained strip heat pipe assembly simulation model, it is sealed and assembled with the all-glass transparent vacuum tube inner tube 1 filled with nitrogen, and then the evacuation tail nozzle of the all-glass transparent vacuum tube outer tube 2 is cut off and sintered to obtain the all-glass metal heat pipe direct-insertion solar vacuum collector tube, and the all-glass metal heat pipe direct-insertion solar vacuum collector tube is derived and visualized.

[0047] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. An all-glass metal heat pipe direct-insertion solar vacuum collector tube, characterized in that: The all-glass metal heat pipe direct-insertion solar vacuum collector tube includes: An all-glass transparent vacuum tube inner tube (1) and an all-glass transparent vacuum tube outer tube (2) both of which have outer walls not coated with a heat-absorbing film layer; After the space between the all-glass transparent vacuum tube inner tube (1) and the all-glass transparent vacuum tube outer tube (2) is evacuated, it is sealed by cutting off and fusing the evacuation tail nozzle (4) of the all-glass transparent vacuum tube outer tube (2); The inner tube (1) of the all-glass transparent vacuum tube is filled with nitrogen and then equipped with a strip heat pipe assembly (3); The strip heat pipe assembly (3) is sealed with the all-glass transparent vacuum tube inner tube (1) by means of a sealant.

2. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 1 is characterized in that: The strip heat pipe assembly (3) comprises: a strip (301) with a heat absorbing film layer and a heat pipe (302); the strip (301) with a heat absorbing film layer and the heat pipe (302) are connected by welding or assembled into one piece by cold extrusion.

3. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 2 is characterized in that: The strip (301) with the heat absorption film layer is provided with a deep groove (303).

4. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 3 is characterized in that: The shape of the strip (301) with the heat-absorbing film layer includes straight lines, twill lines, or a combination of the two; The overall shape formed by the strip (301) with a heat-absorbing film layer and using one or a combination of straight lines or diagonal lines surrounding the heat pipe (302) is one of a plane, a semicircular curved surface, and a full circular curved surface.

5. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 4 is characterized in that: When the strip (301) with the heat absorbing film layer is in the shape of straight lines, the two sides of the heat pipe (302) are connected by welding or cold extrusion to connect the strip (301) with the heat absorbing film layer in the shape of straight lines.

6. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 4 is characterized in that: When the strip (301) with the heat absorbing film layer is in the shape of a diagonal stripe, the two sides of the heat pipe (302) are connected by welding or cold extrusion to connect the strip (301) with the heat absorbing film layer in the shape of a diagonal stripe.

7. The all-glass metal heat pipe direct-insertion solar vacuum collector tube according to claim 4 is characterized in that: When the strip (301) with the heat absorbing film layer is a combination of straight grain and diagonal grain, one side of the heat pipe (302) is connected to the strip (301) with the heat absorbing film layer in a straight grain shape by welding or cold extrusion, and the other side is connected to the strip (301) with the heat absorbing film layer in a diagonal grain shape by welding or cold extrusion.

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