Solar heat collection system and solar water heater

Abstract

The invention provides a solar heat collection system and a solar water heater. The solar heat collection system comprises a plurality of heat collection branches, each heat collection branch comprises a set of heat collectors or a plurality of sets of heat collectors connected in series, each set of heat collectors comprises a header and a plurality of vacuum tubes inserted into the header, and every two adjacent vacuum tubes on the same end side of every two adjacent heat collection branches are communicated. One of the plurality of heat collection branches is connected with a water inlet pipe, and one of the plurality of heat collection branches is connected with a water outlet pipe; according to the system, the two adjacent heat collection branches are directly communicated through the vacuum pipes, the heat collection effect is ensured, system pipelines are simplified, construction is easy and convenient, and the construction period is shortened.

Description

Technical Field

[0001] This application relates to the technical field of solar collectors, and in particular to a solar heat collection system and a solar water heater. Background Art

[0002] In order to adapt to the site area, the existing solar heat collection system arrays are often arranged in an array form. Usually, a plurality of vacuum tubes are inserted on a header to form a set of collectors. The collectors are connected in series to form a branch of the heat collection array, and each branch is then arranged in parallel to form a collector array.

[0003] Among them, each branch is connected to the water inlet pipe and the water outlet pipe through pipe fittings respectively. At the same time, in order to reduce the heat loss during system circulation, the connecting pipelines of each branch to the water inlet pipe and the water outlet pipe need to be insulated and protected.

[0004] However, the above-mentioned solar heat collection system not only has cumbersome connections, but also complex construction and a long construction period. Summary of the Invention

[0005] Embodiments of this application provide a solar heat collection system and a solar water heater to solve the problems that the existing solar heat collection system has cumbersome connections, complex construction and a long construction period.

[0006] In a first aspect, embodiments of this application provide a solar heat collection system, including:

[0007] A plurality of heat collection branches, each heat collection branch including a set of collectors or multiple sets of collectors connected in series, and each set of collectors including a header and a plurality of vacuum tubes inserted on the header;

[0008] Two adjacent vacuum tubes on the same end side in two adjacent heat collection branches are communicated;

[0009] One of the plurality of heat collection branches is connected to the water inlet pipe, and one of the plurality of heat collection branches is connected to the water outlet pipe.

[0010] In some embodiments, the two adjacent vacuum tubes on the same end side are straight-through vacuum tubes;

[0011] The solar heat collection system further includes: a connector; the connector is sleeved outside the two adjacent vacuum tubes on the same end side for communicating the two adjacent vacuum tubes on the same end side.

[0012] In some embodiments, the connector includes: a sealing tube and a ferrule;

[0013] The two adjacent vacuum tubes on the same end side are respectively sleeved inside the sealing tube from both ends of the sealing tube;

[0014] The ferrule is sleeved outside the sealing tube and is used to press the sealing tube and two adjacent vacuum tubes on the same end side.

[0015] In some embodiments, the inner wall of the sealing tube has a raised portion, and two adjacent vacuum tubes on the same end side respectively abut against both sides of the raised portion.

[0016] In some embodiments, the number of ferrules is multiple, and the multiple ferrules are respectively sleeved outside the connection parts of the two adjacent vacuum tubes and the sealing tube.

[0017] In some embodiments, the connecting member further includes: a protective sleeve;

[0018] The protective sleeve is sleeved outside the sealing tube and the ferrule.

[0019] In some embodiments, the protective sleeve is made of a rigid material.

[0020] In some embodiments, a stainless steel tube is sleeved inside the connection part of two adjacent vacuum tubes on the same end side.

[0021] In some embodiments, for two of the plurality of heat collection branches located at the edge positions, one is connected to the water inlet pipe and the other is connected to the water outlet pipe.

[0022] In a second aspect, an embodiment of the present application provides a solar water heater, including: a water storage tank and the solar heat collection system as described in the first aspect above and / or various possible implementation manners of the first aspect. The water storage tank is communicated with the solar heat collection system through a water inlet pipe and a water outlet pipe.

[0023] The solar heat collection system provided by the present application includes a plurality of heat collection branches. Each heat collection branch includes a group of solar collectors or multiple groups of serially connected solar collectors. Each group of solar collectors includes a header tank and a plurality of vacuum tubes inserted on the header tank. Two adjacent vacuum tubes on the same end side in two adjacent heat collection branches are communicated. One of the plurality of heat collection branches is connected to the water inlet pipe, and one of the plurality of heat collection branches is connected to the water outlet pipe; this system directly uses vacuum tubes to connect two adjacent heat collection branches, simplifies the system pipeline, is easy to construct, and utilizes the heat insulation and heat preservation effect of the vacuum tube structure itself, eliminating the need for heat preservation treatment and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application and used together with the description to explain the principles of the present application.

[0025] Figure 1 It is a schematic structural diagram of an existing solar heat collection system;

[0026] Figure 2 It is a schematic structural diagram of the solar heat collection system provided by the embodiment of the present application;

[0027] Figure 3 It is a schematic structural diagram of the through-type vacuum tube in the solar heat collection system provided by the embodiment of the present application;

[0028] Figure 4 is Figure 2 The enlarged view of part A in

[0029] Explanation of the reference numerals in the drawings:

[0030] 1 - Collector; 2 - Main path; 3 - Heat collection branch; 4 - Water inlet pipe; 5 - Water outlet pipe; 6 - Connector; 7 - Stainless steel pipe;

[0031] 11 - Header; 12 - Vacuum tube; 13 - Through-type vacuum tube;

[0032] 21 - Circulation pipe; 22 - Heat preservation pipe; 23 - Protective layer;

[0033] 131 - Inner tube; 132 - Vacuum layer; 133 - Outer tube;

[0034] 61 - Sealing pipe; 62 - Ferrule; 63 - Protective sleeve;

[0035] 611 - Protrusion.

[0036] Through the above-mentioned drawings, the specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and the written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed embodiments

[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0038] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application.

[0040] The terms "first", "second", "third", "fourth", etc. in the description, claims, and drawings of this application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of this application described here, for example, can be implemented in an order other than those illustrated or described here.

[0041] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0042] In the existing solar thermal collection system array, in order to achieve the same flow rate in each branch, generally, an equal-length design for each circulation branch is adopted. Each branch and the main pipeline are respectively connected through pipe fittings. At the same time, in order to reduce the heat loss during system circulation, heat preservation and protection of the heat preservation pipeline (to prevent the aging of the heat preservation pipe) are required for each circulation pipeline. Such connections are cumbersome, require professional installers, and during actual installation, the pipeline pressure test needs to be qualified before heat preservation of the pipeline. This increases the construction period. Once there is leakage in the pipeline, it is necessary to disassemble the heat preservation to check for the leakage point. After the repair is qualified, heat preservation needs to be carried out again, resulting in high installation and after-sales costs.

[0043] In a possible implementation, Figure 1 is a schematic structural diagram of an existing solar thermal collection system, as Figure 1As shown in the figure, multiple vacuum tubes 12 are inserted into the header 11 to form a set of collectors 1. The collectors 1 are connected in series to form the branches of the collector array, and each branch is arranged in parallel to form the collector array. To ensure that the circulating flow rate of each array is consistent, the circulating pipeline usually adopts an equal-length design. The main pipeline 2 and the collector branch pipeline 3 are connected by pipe fittings, and the pipe fittings and the pipeline are sealed with packing. The innermost side of the main pipeline 2 is the circulating pipe 21. To reduce the heat loss of the pipeline, a heat preservation pipe 22 is arranged outside the circulating pipe 21, and the outermost side is protected by a protective layer 23 for the heat preservation pipe 22.

[0044] It can be seen that after the collector branch pipeline 3 is installed, it is necessary to use the main pipeline 2 to connect each collector branch pipeline 3 in parallel. First, the construction of the circulating pipe 21 needs to be carried out. After the construction of the circulating pipe 21 is completed, the pipeline pressure test is carried out. After the pressure test is qualified, the construction of the heat preservation pipe 22 and the protective layer 23 is carried out.

[0045] The pipeline installation nodes of the above solar collector system are numerous and the connections are cumbersome, which requires professional installers to complete. And it is necessary to carry out the pipeline pressure test experiment first and then carry out the subsequent heat preservation and protection operations, with multiple types of work. If the pipeline needs to be repaired, because the leakage point cannot be observed externally, it is necessary to open the protective layer 23 and the heat preservation pipe 22 in turn to find the repair point. After the repair is completed, it is necessary to test the leakage to be qualified and then restore the pipeline heat preservation and the protective layer in turn. The construction is complex and the construction period is very long.

[0046] In view of this, the embodiment of the present application proposes a solar collector system, which includes multiple collector branches, and each collector branch includes one or more groups of collectors connected in series. Each group of collectors consists of a header and multiple vacuum tubes inserted into the header. The two adjacent vacuum tubes on the same end side in two adjacent collector branches are connected to each other. Among the multiple collector branches, one collector branch is connected to the water inlet pipe, and the other collector branch is connected to the water outlet pipe; thus, the vacuum tubes are directly used to connect two adjacent collector branches. This design not only ensures the heat absorption effect of the collectors, but also simplifies the pipeline layout of the system, is convenient for installation, and makes full use of the heat insulation performance of the vacuum tubes themselves, without the need for additional heat preservation treatment, thereby shortening the construction period.

[0047] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0048] Figure 1 It is a schematic structural diagram of the solar collector system provided by the embodiment of the present application. It should be noted that Figure 1A schematic diagram showing the components in a solar heat collection system is presented. The specific structures of the remaining components in the solar heat collection system are not limited to Figure 1 the illustration of

[0049] Referring to Figure 1 According to an embodiment of the present application, the solar heat collection system may include: a plurality of heat collection branches 3, each heat collection branch 3 including a set of collectors 1 or multiple sets of collectors 1 connected in series. Each set of collectors 1 includes a header 11 and a plurality of vacuum tubes 12 inserted into the header 11.

[0050] Two adjacent vacuum tubes on the same end side in two adjacent heat collection branches 3 are connected. One of the plurality of heat collection branches 3 is connected to the water inlet pipe 4, and one of the plurality of heat collection branches 3 is connected to the water outlet pipe 5.

[0051] Exemplarily, the header 11 may include a main body and interfaces. The interfaces may include vacuum tube insertion interfaces, water inlets, and water outlets. Among them, the vacuum tube insertion interfaces are arranged on both sides of the main body of the header 11. The vacuum tubes 12 are installed in the vacuum tube insertion interfaces by means of insertion or threaded connection. In each heat collection branch 3, the water outlets and water inlets of adjacent headers 11 are connected in sequence.

[0052] Specifically, a set of collectors 1 may include a header 11 and a plurality of vacuum tubes 12 inserted on both sides of the header 11. A heat collection branch may be composed of multiple sets of collectors 1 connected in series, that is, each set of collectors 1 in each heat collection branch is connected in series through the connection interfaces of the header 11, enabling the medium to flow through multiple sets of collectors 1 in sequence. Thus, through the equal-path design of each heat collection branch 3, the same flow rate in each branch is achieved, so that the heat absorbed by each set of collectors 1 from sunlight can be evenly distributed throughout the system, ensuring the heat absorption effect of the collectors 1 and avoiding the phenomenon of overheating or overcooling in certain areas.

[0053] In specific implementation, the water inlet pipe 4 is connected to one of the heat collection branches 3 through the water inlet pipe interface of the header 11. The water inlet pipe interface of the header 11 is located at the inlet end of the header 11 and is used to input the unheated medium into the heat collection branch 3. At the same time, in two adjacent heat collection branches 3, the two adjacent vacuum tubes at the outermost bottom end are connected, and the two adjacent vacuum tubes at the outermost top end are connected. The water outlet pipe 5 is connected to another heat collection branch 3 through the water outlet pipe interface of the header 11. The water outlet pipe interface of the header 11 is located at the outlet end of the header 11 and is used to output the heated medium from the heat collection branch 3. Thus, it can be ensured that the medium flows between each heat collection branch 3 and is then distributed into each vacuum tube 12. After being heated in the vacuum tube 12, the medium returns to the header 11 and flows out through the water outlet pipe interface, forming a cycle.

[0054] The medium in the embodiment of the present application may be a heat-carrying medium such as water or an organic medium.

[0055] It is understandable that a solar heat collection system needs to transfer heat through the circulation of a medium. Connecting the vacuum tubes of adjacent heat collection branches 3 can form a continuous fluid channel, which is equivalent to the function of the main path 2 in the existing solar heat collection system, enabling the fluid to flow between the heat collection branches 3. Thus, extra pipes are reduced, the system structure is simplified, and compared with the existing connection method between the main path 2 and the heat collection branches 3 through elbows or tee joints, the resistance of the medium flow is reduced. At the same time, this design also supports modular expansion, and the heat collection branches 3 can be increased or decreased as needed.

[0056] Furthermore, the vacuum layer inside the vacuum tube can effectively isolate the convection and conduction of heat, reducing heat loss. This heat insulation performance enables the vacuum tube to still work efficiently in a low-temperature environment without the need for heat preservation treatment.

[0057] The solar heat collection system of the embodiment of the present application includes multiple heat collection branches. Each heat collection branch includes a set of collectors or multiple sets of collectors connected in series. Each set of collectors includes a header and multiple vacuum tubes inserted into the header. The two adjacent vacuum tubes on the same end side in two adjacent heat collection branches are connected. One of the multiple heat collection branches is connected to the water inlet pipe, and one of the multiple heat collection branches is connected to the water outlet pipe; the system directly uses the vacuum tubes to connect two adjacent heat collection branches, simplifies the system pipeline, is easy to construct, and utilizes the heat insulation and heat preservation function of the vacuum tube structure itself without the need for heat preservation treatment, shortening the construction period.

[0058] Continue to refer to Figure 2 In some embodiments, the two adjacent vacuum tubes on the same end side are straight-through vacuum tubes 13.

[0059] The solar heat collection system further includes: a connector 6, which is sleeved outside the two adjacent vacuum tubes on the same end side for connecting the two adjacent vacuum tubes on the same end side.

[0060] Specifically, both ends of the straight-through vacuum tube 13 are provided with openings, and the medium can flow in from one end and out from the other end. That is to say, one end of the straight-through vacuum tube 13 facing the header 11 is connected to the vacuum tube insertion port of the header, and the end of the straight-through vacuum tube 13 far from the header 11 can be docked with the straight-through vacuum tube 13 of the adjacent heat collection branch 3 through the connector 6. Thus, the straight-through design reduces the flow resistance of the medium, simplifies the connection method between adjacent heat collection branches 3, reduces the installation difficulty. At the same time, the straight-through vacuum tube 13 can be disassembled and replaced separately, and the connector 6 is external. During maintenance, the overall structure does not need to be damaged, which is convenient for repair.

[0061] Hereinafter, the specific structure and working principle of the straight-through vacuum tube 13 will be described.

[0062] Figure 3 This is a schematic structural diagram of a through-type vacuum tube in the solar heat collection system provided by the embodiments of the present application. Refer to Figure 3 , the through-type vacuum tube 13 includes an inner tube 131 and an outer tube 133. A vacuum layer 132 is formed between the outer tube 133 and the inner tube 131, and a heat-absorbing coating is plated on the outer surface of the inner tube 131. Among them, the inner tube 131 and the outer tube 133 can be concentric glass tubes, and the gap between the outer tube 133 and the inner tube 131 is evacuated to a high vacuum to form a heat-insulating vacuum layer 132.

[0063] The outer tube 133 is used to protect the inner tube 131 and the vacuum layer 132 from the influence of the external environment, has high mechanical strength, and can be made of borosilicate glass with a high light transmittance.

[0064] Specifically, the outer tube 133 is closed at both ends to ensure the sealing of the vacuum layer 132 between the outer tube 133 and the inner tube 131, while the inner tube 131 is through-type. The inner tube 131 passes through the inside of the outer tube 133, and openings are provided at both ends thereof, so that the medium can flow in the inner tube 131. The vacuum layer 132 is an annular space existing between the outer tube 133 and the inner tube 131, which is completely isolated from the external environment of the outer tube 133, thereby effectively insulating heat.

[0065] It can be understood that in each heat collection branch 3, the vacuum tubes 12 other than the through-type vacuum tube 13 are closed at one end. The end facing the header 11 is connected to the header 11 of the collector 1, and the end far from the header 11 is fixed on the tail support, and the tail support is installed on the frame of the solar heat collection system. Thus, both the stability of the vacuum tube 12 is ensured, and the requirements of thermal expansion and contraction are met, while being convenient for installation and maintenance.

[0066] Please refer to Figure 2 and Figure 4 , in some embodiments, the connector 6 includes: a sealing tube 61 and a ferrule 62.

[0067] Two adjacent vacuum tubes on the same end side are respectively sleeved in the sealing tube 61 from both ends of the sealing tube 61, and the ferrule 62 is sleeved outside the sealing tube 61 for pressing the sealing tube 61 and the two adjacent vacuum tubes on the same end side.

[0068] Exemplarily, the sealing tube 61 can be made of an elastic material with high temperature resistance and aging resistance, such as silicone rubber, fluororubber or ethylene propylene diene monomer rubber, etc. Thus, the sealing tube 61 made of an elastic material can closely fit the outer wall of the through-type vacuum tube 13 to ensure the sealing performance, and can absorb the thermal expansion and contraction of the through-type vacuum tube 13 and the connector 6 caused by temperature changes, avoiding stress concentration.

[0069] Specifically, the operator can sleeve both ends of the sealing tube 61 on the outermost parts of two adjacent straight-through vacuum tubes 13 respectively, and ensure that the sealing tube 61 is in close contact with the outer wall of the straight-through vacuum tube 13. The ferrule 62 can be arranged on both sides of the sealing tube 61 to ensure a tight connection between the sealing tube 61 and the straight-through vacuum tube 13 through mechanical pressing (such as threads or clamps).

[0070] Thus, the sealing tube 61 is directly sleeved on the straight-through vacuum tube 13, and the installation can be completed by cooperating with the ferrule 62 to press tightly. Thus, not only the sealing performance at the connection of two adjacent straight-through vacuum tubes 13 is ensured to avoid medium leakage, but also the installation difficulty and time are reduced, and the construction efficiency is improved.

[0071] In order to prevent the two adjacent straight-through vacuum tubes 13 from colliding with each other due to a certain external force when being sleeved inside the sealing tube 61, thereby damaging the straight-through vacuum tube 13. Continue to refer to Figure 4 In a specific example, the inner wall of the sealing tube 61 has a ring-shaped protrusion 611, and the two adjacent vacuum tubes on the same end side respectively abut against both sides of the protrusion 611.

[0072] It can be understood that the protrusion 611 on the inner wall of the sealing tube 61 can serve as a limiting structure to separate the two adjacent straight-through vacuum tubes 13 and ensure a certain distance between them. The end parts of the two straight-through vacuum tubes 13 respectively abut against both sides of the protrusion 611 to avoid direct contact and collision between the inner tubes 131 and the outer tubes 133 of the two adjacent straight-through vacuum tubes 13.

[0073] In specific implementation, the operator inserts the end parts of the two adjacent straight-through vacuum tubes 13 into the sealing tube 61 respectively and abuts against both sides of the protrusion 611. The protrusion 611 limits the insertion depth of the vacuum tubes and ensures a certain gap between them. The medium flows through the inner cavity of the sealing tube 61, and the protrusion 611 does not hinder the normal flow of the medium. Thus, the protrusion 611 serves as a positioning reference, facilitating the quick alignment of the position of the straight-through vacuum tube 13 during installation. When disassembling, the vacuum tube only needs to be withdrawn from both sides of the protrusion 611, and the construction is simple.

[0074] Specifically, the protrusion 611 on the inner wall of the sealing tube 61 can be a ring-shaped structure and is located in the middle of the sealing tube 61. The height and width of the protrusion 611 are precisely designed to ensure that the end parts of the two vacuum tubes can stably abut.

[0075] Exemplarily, the inner diameter of the convex portion 611 on the inner wall of the sealed tube 61 needs to be slightly larger than the outer diameter of the straight-through vacuum tube 13 to ensure that two adjacent straight-through vacuum tubes 13 can be smoothly inserted and abutted against both sides of the convex portion 611. The outer diameter of the convex portion 611 needs to match the inner diameter of the sealed tube 61 to ensure that it can be firmly fixed within the sealed tube 61. At the same time, the height of the convex portion 611 needs to consider the wall thickness of the straight-through vacuum tube 13 to ensure that it can effectively limit the position without damaging the vacuum tube. The position of the convex portion 611 can be located in the middle of the sealed tube 61 to ensure that the ends of two adjacent vacuum tubes can be stably abutted.

[0076] Thus, the convex portion 611 on the inner wall of the sealed tube 61 can separate two adjacent straight-through vacuum tubes 13 to ensure their stability within the sealed tube 61, so as to prevent them from directly colliding due to external forces (such as installation pushing and pulling forces, thermal expansion and contraction, fluid pressure, or mechanical vibration), thereby preventing damage to the vacuum tube caused by the collision and ensuring the sealing performance of the vacuum layer.

[0077] As Figure 4 shown, in some embodiments, the number of ferrule 62 is multiple, and multiple ferrules 62 are respectively sleeved on the outer sides of the connection parts between two adjacent vacuum tubes and the sealed tube 61.

[0078] Specifically, the number of ferrules 62 can be set to two, or can be set to more than two. In this regard, the embodiments of the present application do not impose any limitations.

[0079] It can be understood that, please continue to refer to Figure 4 , there is a convex portion 611 provided in the middle of the inner wall of the sealed tube 61, and two adjacent straight-through vacuum tubes 13 are respectively abutted against both sides of the convex portion 611. Therefore, the connection part between the straight-through vacuum tube 13 and the sealed tube 61 here can be the positions on both sides of the convex portion, that is to say, the ferrule 62 can be provided at both ends of the outer wall of the sealed tube 61.

[0080] Exemplarily, two ferrules 62 can be respectively sleeved on the outer sides of the connection parts between two straight-through vacuum tubes 13 and the sealed tube 61 and are pressed tightly by threads or clamps. Thus, each ferrule 62 forms an independent sealing point, and through the uniformly distributed pressing force, the sealing performance and stability of the connection part are ensured.

[0081] Continue to refer to Figure 4 , in some embodiments, the connecting member 6 further includes: a protective sleeve 63, and the protective sleeve 63 is sleeved on the outer sides of the sealed tube 61 and the ferrule 62.

[0082] Specifically, the protective sleeve 63 is provided on the outermost side of the entire connecting member 6 and is used to protect the sealing tube 61 and the ferrule 62. It can prevent the external environment from eroding the sealing tube 61 and the ferrule 62 and extend their service life. The protective sleeve 63 also plays a heat insulation role to avoid personnel contacting high-temperature components. One or both ends of the protective sleeve 63 can be provided with openings for easy installation and disassembly. The protective sleeve 63 can be fixed to the outside of the sealing tube 61 and the ferrule 62 through a clamp.

[0083] In a specific example, the protective sleeve 63 is made of a rigid material.

[0084] Specifically, the protective sleeve 63 can be made of a rigid material such as stainless steel or aluminum alloy, which has high strength and heat resistance. This is because the rigid material can effectively resist external impacts and protect the sealing tube 61 and the ferrule 62 from damage. The protective sleeve 63 made of the rigid material reduces the movement of the connecting part caused by vibration or external force through its structural strength.

[0085] It can be understood that if the sealing tube 61 is made of an elastic material (such as rubber or silica gel), its mechanical strength is low and it is easily damaged by external impacts or extrusion. The rigid protective sleeve 63 can provide external protection for the elastic sealing tube 61 to prevent it from being mechanically damaged. Moreover, the elastic material may age when exposed to ultraviolet rays, rainwater or high-temperature environments for a long time, and the rigid protective sleeve can resist environmental erosion and extend the service life of the elastic sealing tube 61.

[0086] Therefore, by using the protective sleeve 63 made of a rigid material and the sealing tube 61 made of an elastic material, this combined design utilizes the high-efficiency sealing of the elastic sealing tube and the mechanical protection of the rigid protective sleeve, improving the sealing performance and stability of the connecting member 6. The structure is simple and convenient for installation and disassembly.

[0087] As Figure 4 shown, in some embodiments, a stainless steel tube 7 is sleeved inside the connecting part of two adjacent vacuum tubes on the same end side.

[0088] When specifically implemented, the outer diameter of the stainless steel tube 7 needs to match the inner diameter of the straight-through vacuum tube 13 to ensure a tight fit. The inner diameter of the stainless steel tube 7 needs to meet the requirements of fluid flow and is usually slightly smaller than the inner diameter of the straight-through vacuum tube 13. It should be noted that the length of the stainless steel tube 7 needs to cover the connecting part of two adjacent straight-through vacuum tubes 13 and is usually slightly longer than the sealing tube 61.

[0089] Therefore, the stainless steel tube 7 serves as a rigid support, which can enhance the structural strength of the connecting part and prevent deformation or damage caused by external forces. At the same time, the stainless steel tube 7 can serve as a straight-through fluid channel to ensure the flow of the medium between two adjacent straight-through vacuum tubes 13. The stainless steel tube 7 cooperates with the sealing tube 61 to form a double-sealing structure to prevent fluid leakage.

[0090] In some embodiments, for two of the multiple heat collection branches 3 located at the edge positions, one is connected to the water inlet pipe 4 and the other is connected to the water outlet pipe 5.

[0091] Among them, two adjacent heat collection branches 3 are connected by two adjacent straight-through vacuum tubes 13 on the same end side, that is, the multiple heat collection branches 3 are connected together through the straight-through vacuum tubes 13 in their respective branches to form a solar collector array. Therefore, there are two heat collection branches 3 located on the outermost sides in this solar collector array. The water inlet pipe 4 is connected to one of the outermost heat collection branches 3, and the water outlet pipe 5 is connected to the other outermost heat collection branch 3.

[0092] It can be understood that the heat collection branch connected to the water inlet pipe 4 is the first heat collection branch 3 along the direction of medium flow, and the heat collection branch connected to the water outlet pipe 5 is the last heat collection branch 3 along the direction of medium flow. In this way, it can be ensured that the medium enters the system from the water inlet pipe 4, flows through all the heat collection branches 3 in sequence, and finally flows out from the water outlet pipe 5.

[0093] Since the medium flows through all the heat collection branches 3 in sequence, the flow rate and temperature distribution of each heat collection branch 3 are relatively uniform. The medium fully absorbs heat when flowing through all the heat collection branches 3, improving the thermal efficiency of the solar heat collection system.

[0094] The embodiment of the present application also provides a solar water heater, which includes a water storage tank and the solar heat collection system described in any of the foregoing embodiments. The water storage tank is communicated with the solar heat collection system through a water inlet pipe and a water outlet pipe.

[0095] Exemplarily, this solar water heater includes: a circulation pump and a heat exchanger.

[0096] Specifically, the medium enters the heat collection system from the water storage tank through the water inlet pipe, flows through all the heat collection branches in sequence. When flowing through the vacuum tubes, the medium absorbs solar energy and is converted into heat energy, and the temperature gradually rises. The heated medium returns to the water storage tank through the water outlet pipe, transfers the heat to the water in the water storage tank, and transfers the heat of the medium to the water in the water storage tank through the heat exchanger to realize hot water supply. When the water temperature in the water storage tank reaches the set value, the circulation pump stops working; when the water temperature is lower than the set value, the circulation pump starts to continue heating.

[0097] It should be noted that for the specific implementation principle and effect of the solar heat collection system in the above solar water heater, reference can be made to the relevant descriptions and effects corresponding to the above embodiments, and no further elaboration will be made here.

[0098] In the above description, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0099] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

1. A solar thermal collection system, characterized in that: include: A plurality of heat collecting branches, each of which comprises a group of heat collectors or a plurality of groups of heat collectors connected in series, and each group of heat collectors comprises a header and a plurality of vacuum tubes plugged into the header; Two adjacent vacuum tubes at the same end side of two adjacent heat collection branches are connected; One of the multiple heat collection branches is connected to the water inlet pipe, and one of the multiple heat collection branches is connected to the water outlet pipe.

2. The solar thermal collection system according to claim 1, characterized in that: The two adjacent vacuum tubes on the same end side are straight-through vacuum tubes; The solar thermal collection system further comprises: a connecting piece; the connecting piece is sleeved on the outside of two adjacent vacuum tubes on the same end side, and is used to connect the two adjacent vacuum tubes on the same end side.

3. The solar thermal collection system according to claim 2, characterized in that: The connecting piece comprises: a sealing tube and a ferrule; The two adjacent vacuum tubes on the same end side are respectively sleeved into the sealing tube from both ends of the sealing tube; The ferrule is sleeved on the outside of the sealing tube and is used to compress the sealing tube and the two adjacent vacuum tubes on the same end side.

4. The solar thermal collection system according to claim 3, characterized in that: The inner wall of the sealing tube has a circle of raised parts, and the two adjacent vacuum tubes on the same end side are respectively abutted against two sides of the raised parts.

5. The solar thermal collection system according to claim 3, characterized in that: There are multiple ferrules, and the multiple ferrules are respectively sleeved on the outside of the connection parts between the two adjacent vacuum tubes and the sealing tube.

6. The solar thermal collection system according to claim 3, characterized in that: The connecting piece further comprises: a protective sleeve; The protective sleeve is sleeved on the outside of the sealing tube and the ferrule.

7. The solar thermal collection system according to claim 6, characterized in that: The protective sleeve is made of rigid material.

8. The solar thermal collection system according to claim 3, characterized in that: A stainless steel tube is sleeved inside the connection part of two adjacent vacuum tubes on the same end side.

9. The solar thermal collection system according to any one of claims 1 to 6, characterized in that: Of the multiple heat collection branches, two heat collection branches at edge positions are connected to the water inlet pipe at one end and to the water outlet pipe at the other end.

10. A solar water heater, characterized in that: include: A water storage tank and a solar thermal collection system as claimed in any one of claims 1 to 9, wherein the water storage tank is connected to the solar thermal collection system via a water inlet pipe and a water outlet pipe.

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