A vacuum flat plate collector

Abstract

The application discloses a vacuum flat-plate collector, which comprises a vacuum shell, wherein the vacuum shell is in a flat-plate box structure with an upper opening, the upper opening of the vacuum shell is covered with vacuum glass, a heat collecting plate core is arranged in the vacuum shell, and a heat absorption blue film opposite to the vacuum glass is arranged on the heat collecting plate core; and the vacuum shell and the vacuum glass jointly form a vacuum isolation cavity wrapping the heat collecting plate core. The application has the beneficial effects that: by placing the heat collecting plate core in a unified vacuum cavity composed of the vacuum glass and the vacuum shell, heat loss caused by air conduction and convection is almost completely eliminated. This makes the heat collector still maintain a very high heat collecting temperature in a cold environment, significantly improves the heat efficiency, and effectively solves the problem of reverse heat dissipation at night or on rainy days.

Description

Technical Field

[0001] This application belongs to the field of solar energy application technology, specifically relating to a vacuum flat plate solar collector. Background Technology

[0002] Flat-plate solar collectors are common solar thermal utilization devices. Their basic structure includes a rectangular outer frame, a transparent glass cover on top, an internal heat absorber, flow channels, and an insulation layer at the back. The outer frame and glass cover together form a sealed cavity to house the heat absorber and reduce heat loss. This structure is simple, low-cost, and has a certain pressure resistance, making it widely used in domestic hot water heating, building heating, and other fields. The technology is relatively mature.

[0003] However, existing technologies have limitations: either they use vacuum glass while the shell is at atmospheric pressure, or the shell is evacuated while the cover glass is not. Both of these structures result in a discontinuity in the vacuum insulation layer between the shell and the glass cover, preventing the formation of a continuous and complete vacuum seal environment. This discontinuity severely weakens the overall insulation effect, limiting the performance improvement and application range of the solar collector in high-temperature or low-temperature environments. Summary of the Invention

[0004] The purpose of this application is to provide a vacuum flat plate solar collector that solves the problem of insufficient heat preservation effect of existing flat plate solar collectors.

[0005] The objective of this application is achieved through the following technical solution: A vacuum flat plate solar collector includes a vacuum shell, which is a flat box structure with an open top. Vacuum glass is provided on the open top of the vacuum shell. A heat-collecting plate core is provided inside the vacuum shell. A heat-absorbing blue film is provided on the heat-collecting plate core opposite to the vacuum glass. The vacuum shell and the vacuum glass together form a vacuum cavity that surrounds the heat-collecting plate core.

[0006] Furthermore, the vacuum housing is integrally formed from a steel plate.

[0007] Furthermore, the vacuum housing includes an outer housing plate and an inner housing plate, with a vacuum cavity formed between the outer housing plate and the inner housing plate, and a communication port on the inner housing plate that connects to the vacuum cavity.

[0008] Furthermore, the upper opening of the vacuum housing is provided with a retaining edge and a supporting edge. The retaining edge stands upright on the outside of the upper opening, and the supporting edge is placed flat on the inside of the upper opening. The side of the vacuum glass is positioned at the L-shaped end corner formed by the retaining edge and the supporting edge.

[0009] Furthermore, the vacuum glass is a double-layered vacuum glass.

[0010] Furthermore, the vacuum glass is bonded to the vacuum housing using heat-insulating sealant.

[0011] Furthermore, the heat collection plate core is provided with a core inlet pipe and a core outlet pipe, which extend out of the vacuum shell from both sides.

[0012] Furthermore, both the core inlet pipe and the core outlet pipe are welded to the vacuum housing.

[0013] Furthermore, the vacuum housing is provided with a glass pressure strip, which is positioned between the vacuum housing and the vacuum glass.

[0014] Furthermore, the glass pressure strip is L-shaped and is bonded or fastened to the vacuum housing.

[0015] The beneficial effects of this application are: (1) Extreme heat preservation, greatly reducing heat loss: By placing the core of the heat collection plate completely in a unified vacuum cavity composed of vacuum glass and vacuum shell, heat loss caused by air conduction and convection is almost completely eliminated. This allows the heat collector to maintain an extremely high heat collection temperature in cold environments, significantly improves thermal efficiency, and effectively solves the problem of reverse heat dissipation at night or on rainy days.

[0016] (2) Expanding application scenarios and integration: Due to its superior thermal insulation performance, this collector can be widely used in fields with higher operating temperature requirements, such as industrial preheating and driving absorption refrigeration. At the same time, its robust flat plate structure makes it easier to integrate with building facades or roofs, which is both aesthetically pleasing and safe.

[0017] (3) Improved heat collection efficiency and extended lifespan: The external vacuum cavity formed by the shell and glass creates a near-insulated and highly efficient thermal environment for the internal heat collection core. This design prevents the heat converted by the selective absorption blue film on the core from being dissipated into the environment through gas conduction and convection, thus confining the heat to the working fluid in the flow channel to the maximum extent. This not only significantly improves the heat collection efficiency of the blue film, but also slows down the aging of the film layer due to the stability of its working environment, thus ensuring the high efficiency and long-term operation of the collector.

[0018] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding this solution, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here. Attached Figure Description

[0019] Figure 1 This is a structural appearance drawing of this application.

[0020] Figure 2This is a structural cross-sectional view of this application.

[0021] Figure 3 This is an enlarged view of a portion of the structure of this application.

[0022] In the diagram: 1-vacuum shell, 2-vacuum glass, 3-heat collecting plate core, 4-heat absorbing blue film, 5-glass retaining strip; 101-outer shell plate, 102-inner shell plate, 103-connection port, 104-baffle, 105-support edge; 301-plate core inlet pipe, 302-plate core outlet pipe Detailed Implementation The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0023] refer to Figures 1-3 As shown, a vacuum flat plate solar collector includes a vacuum shell 1, a vacuum glass 2, a solar collector core 3, a heat-absorbing blue film 4, and a glass pressure strip 5.

[0024] The vacuum shell 1 is a flat, box-shaped structure with an open top, and is the most basic component of the solar collector. The vacuum shell 1 itself has a vacuum cavity, thus forming a vacuum partition that is only open at the top. At the same time, its interior is used to accommodate and place the solar collector core 3, and the remaining space inside is filled with gas. Through the vacuum partition, the loss of heat from the gas to the outside can be greatly reduced, so that the internal heat is confined to the working fluid in the flow channel to the maximum extent.

[0025] The vacuum housing 1 has a vacuum glass 2 on its upper opening. The vacuum glass 2 completely blocks the upper opening of the vacuum housing 1, thus completing the vacuum cavity of the vacuum housing 1. Together, the vacuum housing 1 and the vacuum glass 2 form a vacuum cavity that encloses the heat collector core 3. This vacuum cavity completely covers the heat collector core 3 and the internal air from all angles, almost completely eliminating heat loss caused by air conduction and convection. This allows the collector to maintain an extremely high heat collection temperature even in cold environments, significantly improving thermal efficiency and effectively solving the problem of reverse heat dissipation at night or on rainy days.

[0026] The vacuum shell 1 contains a heat-collecting plate core 3, on which a heat-absorbing blue film 4 is mounted opposite the vacuum glass 2. The heat-absorbing blue film 4 selectively absorbs sunlight, causing the heat-collecting plate core 3 to heat up. Then, the working fluid flows through the heat-collecting plate core 3, absorbing the heat on the heat-collecting plate core 3 before flowing out, thus realizing the utilization of solar energy. Due to the heat-insulating effect of the vacuum cavity on the internal air, the heat of the internal air can also be transferred to the heat-collecting plate core 3, ensuring the full utilization of heat.

[0027] The vacuum casing 1 is a rectangular box structure, a robust flat plate structure that ensures the stability and reliability of the solar collector. It also facilitates seamless integration with building facades or roofs, resulting in an aesthetically pleasing and safe design. The vacuum casing 1 is made of a single piece of steel plate, minimizing seams and thus maintaining the internal vacuum level.

[0028] The vacuum housing 1 includes an outer housing plate 101 and an inner housing plate 102. The outer housing plate 101 and the inner housing plate 102 are preferably made of 0.6mm thick steel plates. A vacuum cavity is formed between the outer housing plate 101 and the inner housing plate 102. If there is a seam between the outer housing plate 101 and the inner housing plate 102, the seam is treated by welding to ensure sealing and integration.

[0029] The inner plate 102 of the housing is provided with a connecting port 103 that connects to the vacuum cavity of the housing. The connecting port 103 is preferably a copper tube with a diameter of 6mm that is welded to the inner plate 102 of the housing. The vacuum cavity of the housing is evacuated through the connecting port 103 to ensure the internal vacuum environment. After the evacuation is completed, the connecting port 103 is closed. The connecting port 103 is located on the inside to avoid damage from impact.

[0030] The upper opening of the vacuum housing 1 is provided with a retaining edge 104 and a supporting edge 105. Specifically, the outer panel 101 of the housing is integrally connected to the retaining edge 104, the retaining edge 104 is integrally connected to the supporting edge 105, and the supporting edge 105 is integrally connected to the inner panel 102 of the housing. The retaining edge 104 stands upright on the outside of the upper opening, and the supporting edge 104 lies flat on the inside of the upper opening. The side of the vacuum glass 2 is placed at the L-shaped end corner formed by the retaining edge 104 and the supporting edge 105. The retaining edge 104 confines the vacuum glass 2 to the inside, and the supporting plate 105 supports the vacuum glass 2.

[0031] Vacuum glass 2 is a double-layered vacuum glass with excellent heat insulation properties. Vacuum glass 2 is bonded to the vacuum housing 1 using heat-insulating sealant, achieving a sealed connection between the vacuum glass 2 and the vacuum housing 1 and preventing gas exchange between the inside and outside of the housing. Preferably, sealant is applied between the side of vacuum glass 2 and the baffle 104 for ease of operation and reliable results.

[0032] The heat collection plate core 3 is welded with a core inlet pipe 301 and a core outlet pipe 302. The core inlet pipe 301 and the core outlet pipe 302 extend out of the vacuum shell 1 from both sides. The cold working medium is sent into the vacuum shell 1 and into the heat collection plate core 3 through the core inlet pipe 301. The hot working medium leaves the heat collection plate core 3 through the core outlet pipe 302 and is then sent out of the vacuum shell 1.

[0033] Both the core inlet pipe 301 and the core outlet pipe 302 are welded to the vacuum housing 1 to prevent the pipes from passing through the vacuum housing 1 and disrupting the internal vacuum environment. Welding ensures a firm fixation and a reliable seal. Pipe fittings are provided on the core inlet pipe 301 and the core outlet pipe 302 to facilitate subsequent pipe connections.

[0034] A glass strip 5 is provided on the vacuum housing 1. The glass strip 5 is placed between the vacuum housing 1 and the vacuum glass 2. The glass strip 5 serves two purposes: firstly, it is used for decoration, covering the gap to improve the overall aesthetics; secondly, it serves for protection, preventing rainwater and debris from entering the gap and affecting the performance of the sealant.

[0035] The glass pressure strip 5 is L-shaped. One end of the L-shape is attached to the upper surface of the vacuum housing 1 and the vacuum glass 2, and covers the gap between them. The other end of the L-shape is attached to the side of the vacuum housing 1. The glass pressure strip 5 is glued to the vacuum housing 1, or a buckle is left on the vacuum housing 1 to directly fasten the glass pressure strip 5 to the vacuum housing 1.

[0036] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vacuum flat plate solar collector, comprising a vacuum shell (1), characterized in that: The vacuum housing (1) is a flat box structure with an open top. The vacuum housing (1) is covered with vacuum glass (2). The vacuum housing (1) is equipped with a heat collection plate core (3). The heat collection plate core (3) is equipped with a heat-absorbing blue film (4) opposite to the vacuum glass (2). The vacuum housing (1) and the vacuum glass (2) together form a vacuum cavity that wraps around the heat collection plate core (3).

2. The vacuum flat plate solar collector according to claim 1, characterized in that: The vacuum housing (1) is integrally formed from a steel plate.

3. The vacuum flat plate solar collector according to claim 1, characterized in that: The vacuum housing (1) includes an outer shell plate (101) and an inner shell plate (102). A vacuum cavity is formed between the outer shell plate (101) and the inner shell plate (102). The inner shell plate (102) is provided with a communication port (103) that connects to the vacuum cavity.

4. The vacuum flat plate solar collector according to claim 1, 2 or 3, characterized in that: The vacuum housing (1) has a baffle (104) and a support edge (105) at its upper opening. The baffle (104) stands upright on the outside of the upper opening, and the support edge (105) lies flat on the inside of the upper opening. The side of the vacuum glass (2) is located at the L-shaped corner formed by the baffle (104) and the support edge (105).

5. The vacuum flat plate solar collector according to claim 1, characterized in that: The vacuum glass (2) is a double-layer vacuum glass.

6. The vacuum flat plate solar collector according to claim 1 or 5, characterized in that: The vacuum glass (2) is bonded to the vacuum housing (1) with heat-insulating sealant.

7. The vacuum flat plate solar collector according to claim 1, characterized in that: The heat collection plate core (3) is provided with a core inlet pipe (301) and a core outlet pipe (302), which extend out of the vacuum shell (1) from both sides respectively.

8. The vacuum flat plate solar collector according to claim 7, characterized in that: The core inlet pipe (301) and core outlet pipe (302) are both welded to the vacuum housing (1).

9. The vacuum flat plate solar collector according to claim 1, characterized in that: The vacuum housing (1) is provided with a glass pressure strip (5), which is placed between the vacuum housing (1) and the vacuum glass (2).

10. The vacuum flat plate solar collector according to claim 9, characterized in that: The glass strip (5) is L-shaped and is bonded or fastened to the vacuum housing (1).

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