CN212538328U

CN212538328U - Solar water heater

Info

Publication number: CN212538328U
Application number: CN202021094126.7U
Authority: CN
Inventors: 高峰; 刘在祥; 陈艳凤; 蔡园丰; 王兵; 牛争艳
Original assignee: Shanghai Xingye Material Technology Co Ltd
Current assignee: Shanghai Xingye Material Technology Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-02-12
Anticipated expiration: 2030-06-12

Abstract

The application relates to a solar water heater, comprising: the base frame is provided with a water tank and a heat collecting pipe; still bearing on the bed frame is arranged in the radial lateral part of thermal-collecting tube, and can be around the glass reflector of the axis pivoted of thermal-collecting tube, the glass reflector includes: a transparent glass having a first surface facing the heat collection tube and a second surface facing away from the heat collection tube; a reflective coating attached to the second surface of the transparent glass; and the back plate is adhered and fixed on the surface of the light reflecting coating through an adhesive. The solar water heater is provided with a reflecting structure with high reflecting rate, strong weather resistance and long service life, and can reflect sunlight at any time in one day to the heat collecting tube as much as possible.

Description

Solar water heater

Technical Field

The application relates to a solar water heater.

Background

The solar water heater is a heating device for converting solar energy into heat energy, and heats water from low temperature to high temperature so as to meet the requirement of hot water in life and production of people.

The solar water heater mainly comprises heat collecting pipes, a water tank, a base frame and other related parts, and solar energy is converted into heat energy mainly by the heat collecting pipes. The heat collecting pipe mainly comprises a vacuum pipe consisting of an inner pipe and an outer pipe which are coaxially arranged, wherein a vacuum annular cavity is arranged between the inner pipe and the outer pipe, and a heat absorbing coating is attached to the pipe wall of the inner pipe.

In order to facilitate assembly and fully exert the performance of each heat collecting pipe, each heat collecting pipe on the solar water heater needs to be arranged at a certain distance. Sunlight is parallel light, and the heat absorption coating is only arranged on the tube wall of the inner tube, so the effective light receiving area of each heat collecting tube is only the radial projection area of the inner tube. Therefore, the effective light receiving area of the solar water heater is less than one fifth of the appearance area of the solar water heater, and sunlight which is irradiated between the heat collecting pipes and between the inner pipe and the outer pipe cannot be utilized.

In this regard, it is conceivable to install a reflector on the backlight side of the heat collecting tubes, so that sunlight emitted between the heat collecting tubes and between the inner tube and the outer tube is reflected to the heat collecting tubes, especially the inner tube of the heat collecting tubes, by the reflector. However, it still has the following disadvantages:

1. the positions of the added reflector, the base frame and the reflector are relatively fixed, and the incident angle of sunlight changes constantly in one day. No matter how to improve the shape of the reflector, the reflector with fixed position and angle cannot reflect more sunlight which is emitted to the heat collecting pipes at each time interval. The reflector can only give full play to the efficacy in a specific time period of a day, and the light rays reflected to the heat collecting tube in other time periods are few.

2. The reflector for solar water heater generally adopts three structural forms of mirror steel plate or mirror aluminum alloy or reflecting film attached on the base body. However, the reflectivity of the three reflective plates is lower than that of a glass reflector, and the three reflective plates are easily polluted, and the reflectivity of the polluted reflective plates is obviously reduced, so that the reflective structures on the surfaces of the three reflective plates can be damaged if the three reflective plates are frequently wiped and maintained. In addition, the three reflectors have poor weather resistance and are easy to corrode and damage, and even if the reflectors are not polluted, the reflectivity is obviously reduced after the reflectors are used for a long time.

3. The reflecting surfaces of the reflecting plates with the three structural forms are easy to deform and scratch in the installation and use processes, so that the initially set reflecting angle is changed, and the light receiving efficiency of the heat collecting tube is influenced.

Disclosure of Invention

The technical problem that this application will solve is: the solar water heater is provided with a reflecting structure which has high reflecting rate, strong weather resistance and long service life and can reflect sunlight at any time in one day to a heat collecting pipe as much as possible.

The technical scheme of the application is as follows:

a solar water heater comprising:

a base frame, and

the water tank and the heat collecting pipe are arranged on the base frame;

still bearing on the bed frame is arranged in the radial lateral part of thermal-collecting tube, and can be around the glass reflector of the axis pivoted of thermal-collecting tube, the glass reflector includes:

a transparent glass having a first surface facing the heat collection tube and a second surface facing away from the heat collection tube;

a reflective coating attached to the second surface of the transparent glass; and

and the back plate is adhered and fixed on the surface of the light reflecting coating through an adhesive.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the adhesive forms a continuous and dense adhesive layer between the backing sheet and the reflective coating.

The back plate and the reflective coating are bonded and fixed by a hot-melt EVA film clamped between the back plate and the reflective coating.

The back plate is made of glass.

The back plate is a flexible membrane.

The back plate is an explosion-proof membrane.

The glass reflector is a strip-shaped concave curved mirror which extends linearly along the length direction of the heat collecting tube.

The solar heat collecting tube is characterized in that the number of the heat collecting tubes is at least two, the glass reflectors are at least two, the heat collecting tubes are arranged in parallel at intervals, and each glass reflector is arranged on the radial side part of one corresponding heat collecting tube in parallel and can rotate around the axis of the heat collecting tube.

The solar heat collecting device is characterized in that two reflector support arms distributed at intervals are fixedly arranged on the base frame, a plurality of sleeve holes distributed at intervals along the length direction of each reflector support arm are formed in each reflector support arm, a supporting bearing is coaxially installed in each sleeve hole, each heat collecting tube is inserted in a hanging mode into one corresponding supporting bearing on one reflector support arm and one corresponding supporting bearing on the other reflector support arm, and each glass reflector is connected with one corresponding supporting bearing on one reflector support arm and one corresponding supporting bearing on the other reflector support arm.

And one of the reflector support arms is provided with a driving device which is in transmission connection with the glass reflector so as to drive the glass reflector to rotate.

The application can realize the following beneficial effects:

1. this application utilizes the glass reflector of angularly adjustable to reflect the sunlight to the thermal-collecting tube outside to guaranteed that each thermal-collecting tube of solar water heater can both acquire sufficient illumination in any period of one day, showing the thermal-collecting effect that promotes the water heater.

2. The glass reflector has high light reflection rate and excellent weather resistance, and has long service life while improving the photo-thermal conversion efficiency of the solar water heater.

3. The reflecting coating of the glass reflector is attached to the backlight surface of the reflector, and the reflectivity of the reflector is not influenced by the dirt on the reflecting coating. The reflection rate of the reflector is reduced only when the reflecting surface of the reflector is polluted, but the reflection rate of the glass reflector is far smaller than that of a common mirror steel plate, a common mirror aluminum alloy or a common reflecting film under the same pollution degree. Moreover, the reflecting surface can be directly cleaned after being polluted, and the reflecting coating on the back side cannot be contacted and damaged by the cleaning action.

4. The glass reflector comprises transparent glass and a reflective coating which are possessed by the traditional glass reflector, and a fixed back plate is pasted on the backlight surface of the glass reflector, so that the defect that the traditional glass reflector is easy to damage and collapse is overcome.

5. The glass reflector adopts a concave curved mirror with light-gathering performance, and can reflect all the received sunlight to the corresponding heat collecting tube.

6. The heat collecting tube does not bear the weight of the glass reflector and is not a rotary supporting body of the glass reflector, and a bearing carrier and a rotary carrier of the heat collecting tube are both two reflector supporting arms on the base frame, particularly the base frame. During production and processing, the coaxiality of the sleeve holes on the two reflector support arms and the coaxiality of the support bearings are easy to control, and the support bearings have the coaxiality compensation function, so that all the glass reflectors can smoothly rotate and are arranged on the solar water heater very neatly. In addition, the weight and the rotation friction force of the glass reflector cannot be applied to the heat collecting tube, and the service life of the heat collecting tube is guaranteed.

7. The adhesive used for bonding and fixing the reflective coating and the back plate is EVA hot melt adhesive. When the EVA film is implemented, the hot-melt EVA film is clamped between the two structural layers, certain pressure is applied, the two structural layers are tightly connected together after the hot-melt EVA film is cooled and solidified, and the process is convenient to implement and high in connection strength. Moreover, the bonding process can form a continuous and compact adhesive layer, even if the transparent glass of the glass reflector is broken by external force, the broken transparent glass still adheres to the adhesive layer (and the back plate) on the back side and is kept basically flush with the transparent glass nearby, so that the transparent glass can be broken without collapsing, the reflecting angle of the transparent glass cannot be greatly changed after being broken, and the received sunlight can still be reflected to the heat collecting tube. In addition, the adhesive layer and the back plate can also protect the reflective coating on the inner side of the adhesive layer and the back plate from being damaged by foreign objects, and a protective layer is not required to be specially arranged on the reflective coating like the traditional reflector.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description only relate to some embodiments of the present application and are not limiting on the present application.

Fig. 1 is a schematic structural diagram of a glass reflective mirror of a solar water heater in a first working angle according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a glass reflective mirror of a solar water heater in a second working angle according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a glass reflective mirror of a solar water heater in a third working angle according to an embodiment of the present application.

Fig. 4 is an exploded schematic view of a main body of a solar water heater according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of relative positions of a heat collecting tube and a glass reflective mirror in the embodiment of the present application.

Fig. 6 is one of exploded structural views of the upper mirror support arm in the embodiment of the present application.

FIG. 7 is a second exploded view of the upper mirror support arm according to the embodiment of the present application.

Fig. 8 is one of exploded structural views of the lower mirror support arm in the embodiment of the present application.

FIG. 9 is a second exploded view of the lower mirror support arm in the embodiment of the present application.

FIG. 10 is a schematic view of a connection structure of the heat collecting tube, the water tank and the mirror support arm in the embodiment of the present application.

Fig. 11 is an enlarged view of the X1 portion of fig. 10.

Fig. 12 is an enlarged view of the X2 portion of fig. 10.

Fig. 13 is a schematic cross-sectional structure view of a heat collecting tube and a glass reflective mirror in the embodiment of the present application.

Fig. 14 is an enlarged view of the X3 portion of fig. 13.

Wherein:

1-pedestal, 2-water tank, 201-heat collecting pipe plug hole, 3-heat collecting pipe, 4-glass reflector, 401-transparent glass, 402-reflecting coating, 403-backboard, 404-adhesive, 5-reflector supporting arm, 501-trepanning, 6-support bearing, 601-bearing outer ring, 602-bearing inner ring, 7-chain wheel, 8-motor, 9-chain, 10-bottom support, 5 a-support arm front cover, 5 b-support arm rear cover, 11-rubber dust ring and 12-connecting plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The use of "first," "second," and similar terms in the description and claims of this patent application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

The term "plurality" as used herein means two or more unless otherwise specified.

Embodiments of the present application will now be described with reference to the accompanying drawings.

Fig. 1 to 14 show a preferred embodiment of the solar water heater of the present application, which also includes a base frame 1, a water tank 2 and eight heat collecting pipes 3 on the base frame, as in the conventional solar water heaters. The water tank 2 is fixed to the base frame 1 and has a water inlet port and a water outlet port, and the water inlet port and the water outlet port are respectively connected to a water inlet pipeline and a water outlet pipeline during practical application, so that flowing water is introduced into the water tank 2. One end of each heat collecting pipe 3 is inserted into the water tank 2 (the matching part is sealed and does not leak water). In order to facilitate processing and assembly, the heat collecting pipes 3 are arranged in the same plane at equal intervals. The base frame 1 serves as a support carrier for the entire solar water heater, for carrying the weight of the aforementioned water tank 2 and heat collecting pipe 3, as well as the various components described below, and defines the aforementioned plane. Of course, in some other embodiments of the present application, the heat collecting tubes 3 may be arranged at random intervals, and are not necessarily in the same plane.

Different from the traditional solar water heater: eight glass reflectors 4 are further supported on the base frame 1, the eight glass reflectors 4 are arranged on the radial side portions of the eight heat collecting pipes 3 in a one-to-one correspondence mode, and each glass reflector 4 can rotate around the axis of the corresponding heat collecting pipe 3. That is, the glass mirrors 4 are rotatably connected but not tightly connected to the water heater, and the rotation axis of each glass mirror 4 on the base frame 1 is exactly the tube axis of the corresponding heat collecting tube 3.

When the solar water heater works, the angle of the glass reflecting mirror 4 can be adjusted in real time according to the incident angle of sunlight, so that the sunlight rays which pass through the outer side of the heat collecting tube 3 and irradiate the glass reflecting mirror 4 are reflected to the heat collecting tube 3, the light receiving area of the heat collecting tube 3 is increased, and the efficiency of the solar water heater is further improved.

Moreover, the glass mirror 4 is a special structure, which is mainly composed of transparent glass 401, reflective coating 402 and back plate 403, specifically: the transparent glass 401 has a first surface facing the heat collecting tube 3 and a second surface facing away from the heat collecting tube. A reflective coating 402 is attached to the second surface of the transparent glass. The back plate 403 is adhesively fixed to the surface of the reflective coating 402 by an adhesive 404.

It can be seen that the glass reflective mirror 4 of the present embodiment includes transparent glass and a reflective coating layer of the conventional glass reflective mirror, and a fixed back plate is further bonded to the back surface of the conventional glass reflective mirror, so as to make up for the defects that the conventional glass reflective mirror has low structural strength and is easy to damage and hurt people.

As mentioned above, the reflective coating 402 is attached to the second surface of the transparent glass facing away from the heat collecting tube 3. Therefore, the reflecting surface of the glass reflector 4 is arranged towards the heat collecting tube 3, and the light received by the glass reflector can be reflected to the heat collecting tube 3.

The adhesive 404 is EVA hot melt adhesive. In implementation, the hot-melt EVA film is sandwiched between the back plate 403 and the reflective coating 402, and a certain pressure is applied, after the hot-melt EVA film is cooled and solidified, the back plate 403 and the reflective coating 402 are tightly connected together.

It should be noted that if the EVA film is sandwiched between the back sheet 403 and the reflective plating layer 402 and then heated to melt the EVA film, the term "the EVA film is sandwiched between the back sheet 403 and the reflective plating layer 402".

The hot-melt bonding process described above allows the adhesive 404 to be continuously and densely distributed between the back plate 403 and the reflective plating layer 402, forming a continuous and dense adhesive layer. By "continuous densification", it is meant that the adhesive between the backing 403 and the reflective coating 402 is continuously distributed to form a unitary body, and the adhesive layer has no significant holes or grooves.

Even if the transparent glass 401 of the glass reflector is broken by an external force, the broken transparent glass 401 adheres to the adhesive layer (and the back plate) on the back side and is kept basically flush with the transparent glass nearby, so that the reflector is broken without collapsing, the reflection angle of the reflector is not greatly changed after the reflector is broken, and the received sunlight can be reflected to the heat collecting tube.

In this embodiment, the back plate 403 is made of glass, and is also made of transparent glass. The use of glass as the back plate 403 has these benefits: the glass is beautiful and elegant, has strong weather resistance and is durable. Also, even if the glass back plate is broken by an external force, the broken transparent glass adheres to the adhesive layer, so that the glass back plate is broken without collapsing, and safety is high based on the presence of the continuous and dense adhesive layer.

It should be noted that the back plate 403 may also be a flexible film that is not easily broken, such as an explosion-proof film. When the back plate 403 is a structure that is not easily broken, such as an explosion-proof membrane, the adhesive 404 may be spread between the bonded back plate 403 and the reflective coating 402, and the adhesive need not be continuously dense. At this time, the explosion-proof structure of the glass mirror is mainly a back plate rather than an adhesive layer.

In this embodiment, the glass reflective mirror 4 is a strip-shaped concave curved mirror extending linearly along the length direction of the heat collecting tube 3. By "elongated" in this application is meant that the length of the member is significantly greater than its width, typically the length of the member is at least five times the width. The glass reflector 4 is a concave curved mirror, the reflecting surface of the glass reflector is a concave curved surface, the glass reflector 4 has high light gathering capacity, and all the received solar rays can be reflected to the heat collecting tube 3. Further, as shown in fig. 5, the glass mirror 4 is a circular arc mirror.

Just because the glass reflective mirror 4 of the present embodiment is a concave curved mirror, the transparent glass configured thereon is difficult to be tempered (limited by the tempering process), so the applicant could consider that the back plate is disposed on the backlight side to improve the service life and safety of the glass reflective mirror.

If the glass reflective mirror 4 is rotatably connected with the heat collecting tube 3, the heat collecting tube 3 supports the weight of the glass reflective mirror 4, so that the risk of damage of the heat collecting tube 3 is increased, and the glass heat collecting tube 3 has dimensional tolerance due to the defects of the manufacturing process, namely the coaxiality of two ends of the heat collecting tube and the concentricity of the tube wall of the heat collecting tube are not high enough, so that the glass reflective mirror 4 cannot rotate smoothly. In this regard, the present embodiment employs the following structure for mounting the glass mirror 4:

referring to fig. 6 to 9, two mirror support arms 5 spaced apart from each other are fixedly provided to the base frame 1. Each mirror support arm 5 is provided with eight sleeve holes 501 arranged at intervals along the length direction thereof, and a support bearing 6 is coaxially mounted in each sleeve hole 501. For convenience of description, the aforementioned two mirror support arms 5 are referred to herein as an upper mirror support arm and an upper mirror support arm, respectively. The upper ends of the eight heat collecting pipes 3 are respectively inserted into the eight support bearings arranged on the upper side reflector support arm, and the lower ends of the eight heat collecting pipes 3 are respectively inserted into the eight support bearings arranged on the lower side reflector support arm. It is understood that the support bearings are installed in the sleeve holes 501, and the upper and lower ends of the heat collecting tube 3 are respectively inserted into the support bearings of the two mirror support arms 5, so that the upper and lower ends of the heat collecting tube 3 are also inserted into the sleeve holes 501 of the two mirror support arms 5. The upper ends of the eight glass reflectors 4 are respectively connected with eight support bearings arranged on the upper side reflector support arm, and the lower ends of the eight glass reflectors 4 are respectively connected with eight support bearings arranged on the lower side reflector support arm, so that the rotation of each glass reflector 4 is supported by the corresponding two support bearings.

As can be seen from the above, the heat collecting tube 3 does not bear the weight of the glass reflector 4, and is not a rotary support body of the glass reflector 4, and the bearing carrier and the rotary carrier of the heat collecting tube 3 are both the base frame 1, especially two reflector support arms 5 on the base frame. During production and processing, the coaxiality of the sleeve holes 501 and the support bearings on the two reflector support arms is easy to control, and the support bearings have the coaxiality compensation function, so that the glass reflectors 4 can smoothly rotate and are arranged on the solar water heater very neatly. In addition, the weight and the rotation friction force of the glass reflecting mirror 4 cannot be applied to the heat collecting tube 3, and the service life of the heat collecting tube 3 is ensured.

In order to realize automatic control of the rotation of the glass reflecting mirror 4, the present embodiment is further provided with a driving device which is in transmission connection with the glass reflecting mirror 4 and rotates with the glass reflecting mirror.

The driving device mainly comprises eight chain wheels 7, a chain 9 and a motor 8. Wherein, eight chain wheels 7 correspond fixedly with aforementioned eight glass reflectors 4 one-to-one, and the axis of each chain wheel 7 and the axis coincidence of corresponding thermal-collecting tube 3. The motor 8 is in transmission connection with each chain wheel 7 through a chain 9 to drive each chain wheel 7 to synchronously rotate, and then eight glass reflectors 4 are driven to synchronously rotate.

When the synchronous driving device works, the motor 8 drives the chain wheels 7 to synchronously rotate through the chain 9. The chain wheel 7 drives the glass reflective mirrors 4 fixed with the chain wheel to rotate, and then the reflection angle of each glass reflective mirror 4 is adjusted in real time, so that each heat collecting pipe 3 can obtain sufficient illumination in any time period.

The support bearing 6 may be a rolling bearing or a sliding bearing. Each support bearing in this embodiment is a sliding bearing, and specifically, the aforementioned sliding bearing includes a bearing outer race 601 fixed in the sleeve hole 501 by screw locking and a bearing inner race 602 fitted rotatably in the bearing outer race. The glass mirror 4 is fixedly connected to the aforementioned bearing inner race 602.

Further, two ends of the glass reflective mirror 4 are respectively fixed with a connecting plate 12, and the connecting plate 12 and the bearing inner ring 602 are fixed by screw locking, so that the glass reflective mirror 4 and the bearing inner ring 602 are fixed.

Further, one axial end of the bearing inner ring extends out of the bearing outer ring, and the extending end of the bearing inner ring is integrally provided with a butt plate which is attached to the connecting plate 12 and is locked and fixed by the screw.

In this embodiment, the fixed connection mode between the sprocket 7 and the glass mirror 4 specifically includes: the chain wheel 7 is sleeved outside the bearing inner ring 602, and the chain wheel 7 is tightly connected with the bearing inner ring 602. That is, the sprocket 7 and the glass reflective mirror 4 are indirectly and fixedly connected by the bearing inner ring 602 (and the connecting plate 12), and when the glass reflective mirror is in operation, the sprocket 7 driven by the motor drives the bearing inner ring 602 to rotate, and the bearing inner ring 602 drives the glass reflective mirror 4 fixed with the bearing inner ring 602 to rotate so as to adjust the reflection angle.

In the two reflector support arms, the lower reflector support arm is directly locked and fixed with the base frame 1 by a screw, and the upper reflector support arm is locked and fixed on the outer side of the water tank 2 by a screw. The water tank 2 is fixed with the bed frame 1, and the reflector support arm 5 of upside and water tank 2 direct fixation, so upside reflector support arm and bed frame 1 indirect fixation, the weight of upside reflector support arm still finally is by bed frame 1 bearing.

If the heat collecting tube 3 is completely suspended and inserted in the trepan boring of the reflector supporting arm 5 and the supporting bearing, and the reflector supporting arm 5 does not bear the weight of the heat collecting tube 3, then other structures must be arranged on the solar water heater to bear the heat collecting tube 3, which increases the processing difficulty and material cost of the water heater, especially the base frame 1 to a certain extent. In this respect, the present embodiment is modified as follows:

eight trepanning 501 of the lower reflector supporting arm are respectively and fixedly connected with a plastic bottom support 10, namely eight bottom supports in total. The lower end of the heat collecting pipe 3 is inserted in the bottom support 10 and is abutted against the bottom support 10. The same as the traditional structure, the upper ends of the eight heat collecting pipes 3 are inserted into the heat collecting pipe inserting holes 201 on the outer wall of the water tank 2. So, directly bear each thermal-collecting tube 3 by downside reflector panel support arm and water tank 2. The weight of thermal-collecting tube 3 is directly supported by reflector support arm 5 and water tank 2, and the weight of reflector support arm 5 and water tank 2 is supported by bed frame 1 again, so the weight of thermal-collecting tube 3 is also supported by bed frame 1 naturally.

The fixing mode of the bottom support 10 and the lower side reflector supporting arm is as follows: the inner wall of the bearing outer ring 601 is provided with an internal thread, the surface of the bottom support 10 is provided with an external thread matched with the internal thread, and the internal thread and the external thread are in locking connection through the matched internal thread and external thread.

In addition, in order to prevent dust from entering the annular gap between the heat collecting tube 3 and the bearing inner ring 602, the present embodiment provides a rubber dust ring 11 between the heat collecting tube 3 and the bearing inner ring 602. Similarly, in order to prevent dust from entering the gap between the bearing outer ring 601 and the trepan 501, the present embodiment also provides a rubber dust ring 11 between the bearing outer ring 601 and the trepan 501.

In order to prevent the chain 9 and the chain wheel 7 running in operation from causing injury to people, the chain 9 and the chain wheel 7 are completely hidden inside the mirror support arm 5 in the embodiment. Further, for the convenience of mounting, the mirror support arm 5 is constituted by a support arm front cover 5a and a support arm rear cover 5b, the support arm front cover 5a and the support arm rear cover 5b are detachably connected by screws, and a chain 9 and a sprocket 7 are arranged between the support arm front cover 5a and the support arm rear cover 5 b.

It should be noted that in some other embodiments of the present application, the number of the glass reflective mirrors 4 and the number of the heat collecting pipes 3 are different. The glass mirror 4 may be disposed only at a radial side portion of a part of the heat collecting tube 3 as needed. Also, the above-described base frame 1 is not limited to such a structure as shown in the drawings of the present specification, and may take various forms, such as: a keel in secure connection with a building or ground, even the building or ground itself.

By "suspended insertion" it is meant that the insert is completely isolated from, and does not directly contact, the outer sleeve.

The above are exemplary embodiments of the present application only, and are not intended to limit the scope of the present application, which is defined by the appended claims.

Claims

1. A solar water heater comprising:

a base frame (1), and

a water tank (2) and a heat collecting pipe (3) which are arranged on the base frame;

its characterized in that, the bearing has on bed frame (1) is located thermal-collecting tube (3) radial lateral part, and can encircle the axis pivoted glass reflector (4) of thermal-collecting tube (3), the glass reflector includes:

a transparent glass (401) having a first surface facing the heat collecting tube (3) and a second surface facing away from the heat collecting tube;

a reflective coating (402) attached to the second surface of the transparent glass; and

and the back plate (403) is adhered and fixed on the surface of the reflective coating (402) through an adhesive (404).

2. Solar water heater according to claim 1, wherein the adhesive (404) forms a continuous dense adhesive layer between the back plate (403) and the reflection coating (402).

3. The solar water heater according to claim 2, wherein the back plate (403) and the reflective coating (402) are fixed by means of hot-melt EVA film sandwiched therebetween.

4. Solar water heater according to claim 2 or 3, wherein the back plate (403) is glass.

5. Solar water heater according to claim 1, wherein the back plate (403) is a flexible membrane.

6. Solar water heater according to claim 5, wherein the back plate (403) is an explosion proof membrane.

7. Solar water heater according to claim 1, characterized in that the glass mirror (4) is an elongated concave curved mirror extending linearly along the length of the collector tube (3).

8. The solar water heater according to claim 1, wherein the number of the heat collecting pipes (3) is at least two, the number of the glass reflectors (4) is at least two, the heat collecting pipes are arranged in parallel at intervals, and each glass reflector (4) is arranged in parallel at a radial side portion of the corresponding heat collecting pipe (3) and can rotate around the axis of the heat collecting pipe (3).

9. The solar water heater according to claim 8, wherein two mirror support arms (5) are fixedly arranged on the base frame (1) at intervals, each mirror support arm (5) is provided with a plurality of sleeve holes (501) arranged at intervals along the length direction of the mirror support arm, a support bearing is coaxially arranged in each sleeve hole (501), each heat collecting tube (3) is inserted in a manner of suspending in the air in a support bearing corresponding to one mirror support arm (5) and a support bearing corresponding to the other mirror support arm (5), and each glass mirror (4) is connected with a support bearing corresponding to one mirror support arm (5) and a support bearing corresponding to the other mirror support arm (5).

10. The solar water heater according to claim 9, wherein one of the mirror support arms (5) is provided with a driving device which is in transmission connection with the glass mirror (4) to drive the glass mirror (4) to rotate.