Patent Application
20140283908
1. Field of the Invention
The present invention relates to a concentrated photovoltaic receiver, and more particularly, to a modularized concentrated photovoltaic receiver with a fixing structure.
2. Description of the Prior Art
Concentrated photovoltaic technology uses optics such as Fresnel lens or curved mirrors to concentrate a large amount of sunlight onto a small area of solar photovoltaic cells to generate electricity. Through a Fresnel lenses, the sunlight is concentrated onto a transparent light-guide cylinder which has a reverse pyramid-like shape, namely, a light homogenizer. The lower end of the light homogenizer has a flat surface to homogenize the light-spot energy from the Fresnel lenses. If the light-spot energy is not first homogenized by the light homogenizer and direct shines on the solar photovoltaic cell, the energy will be too concentrated, which lowers the efficiency to turn the sunlight into electricity. Besides, the angle of the sunlight is changing throughout the day. The concentrated photovoltaic module must cooperate with a sun-tracing system. The sun-tracing system will adjust the angle to get the most sunshine. One of the functions of the light homogenizer is to improve the angle tolerance of the concentrated photovoltaic module. It can also improve the assembly tolerance of the module. Therefore, the light homogenizer is a very important functional element.
In the past, the light homogenizer is installed manually. For the demand of function, the light homogenizer is top-heavy. A layer of adhesive material is provided between the light homogenizer and the concentrated photovoltaic cell to bond both. Sometimes, the support strength is not enough so that the concentrated photovoltaic module may incline and come off easily. Besides, the junction between the light homogenizer and the concentrated photovoltaic cell will accumulate the heat of concentrated light, and therefore the temperature there is high. If the adhesive material is softened by heat and is unable to support the light homogenizer, the light homogenizer will incline and influence its function and reliability.
To consider the main function of the light homogenizer, the incident light is totally reflected by the glass wall of the light homogenizer. If the glass wall has dust, water drop or other contaminants, the condition for total reflection will be destroyed and cause light leak, such that the light cannot be reflected to the concentrated photovoltaic cell. This will influence the efficiency of the light homogenizer and the conversion efficiency of the concentrated photovoltaic receiver greatly.
Furthermore, the contact interface between the light homogenizer and the glue may have the problem of light leak. Because the light homogenizer is installed manually, the glue may be pressed by the light homogenizer to overflow to the lower surface of the side of the light homogenizer, if there is no auxiliary device to fix the installation height of the light homogenizer. The glue attached to the lower surface of the side of the light homogenizer will cause loss of light energy, and therefore lower the efficiency of the concentrated photovoltaic receiver.
Due to the unstable connection of the light homogenizer, which may lower the efficiency of the concentrated photovoltaic receiver, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.
The primary object of the present invention is to provide a concentrated photovoltaic receiver with a fixing structure by using a support member to support and position a light homogenizer. With this fixing structure, the light homogenizer won't incline or come off because of gravity or other factors during sun-tracing process of the concentrated photovoltaic module.
A further object of the present invention is to provide a concentrated photovoltaic receiver with a fixing structure, wherein the support member functions as a fixture for the light homogenizer, such that the light homogenizer can be connected to the concentrated photovoltaic cell at an accurate position and height, and therefore it can be in the best working condition.
Another object of the present invention is to provide a concentrated photovoltaic receiver with a fixing structure, through the air-isolated structure of the support member, the present invention can prevent the external mist, greasy dirt, dust or the like from adhering to the outer walls of the light homogenizer, such that the light homogenizer can keep high efficiency of total reflection for a long time.
In order to achieve the aforesaid objects, the concentrated photovoltaic receiver with a fixing structure comprises a base, a concentrated photovoltaic cell disposed on the base, a support member and a light homogenizer. The support member comprises at least one fixing portion, a support body and a through hole. The fixing portion is located at two sides of the concentrated photovoltaic cell and has a bottom surface attached to the base. The support body is connected with the fixing portion and has a space to accommodate the concentrated photovoltaic cell. The through hole is formed on the top of the support body is located above the concentrated photovoltaic cell. The light homogenizer is inserted through the through hole and located above the concentrated photovoltaic cell. Thus, when the concentrated photovoltaic receiver is running, the light homogenizer is positioned and won't be inclined so as to keep its work efficiency.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
The base 2 is to bear all the parts and provides a threaded connection function. The concentrated photovoltaic cell 11 and the support member 3 are disposed on the base 2. The support member 3 comprises two portions, the fixing portion 31 and the support body 32. The through hole 33 is formed on the top of the support body 32. The light homogenizer 4 is inserted through the through hole 33 to touch the concentrated photovoltaic cell 11.
The support body 32 of the support member 3 is connected with the fixing portion 31. A space 311 is defined in the support member 3 to accommodate the concentrated photovoltaic cell 11. The support body 32 is a cover-type or a cap-type configuration, and has a reverse U cross-section having the space 311 therein. The support body 32 has a top 320 with the through hole 33. The through hole 33 corresponds in position to the concentrated photovoltaic cell 11 so that the light homogenizer 4 can be inserted through the through hole 33 and aligned to the concentrated photovoltaic cell 11 in order to evenly distribute the sunlight onto the concentrated photovoltaic cell 11. In addition, the diameter of the through hole 33 is tapered downward. The through hole 33 has an inclined inner wall 331 to mate with the configuration of the light homogenizer 4.
Due to the demand of function, the configuration of the light homogenizer 4 is not limited to a reverse trapezoid cylinder and it can have other shapes such as a paraboloid body (like a bullet) or a hemisphere body. As a whole, the light homogenizer 4 is a solid transparent body which has a large upper part and a small lower part so as to be inserted into the through hole 33. Through the inclined inner wall 331 of the through hole 33, the light homogenizer 4 is retained at a certain height and won't incline, at the same time, the upper slab of the light homogenizer 4 is retained by the top 320 of the support body 32. The position and diameter of the through hole 33 and the top 320 of the support body 32 provide a positioning function to the light homogenizer 4 so that the light homogenizer 4 won't incline or come off because of gravity or other factors during sun-tracing process of the concentrated photovoltaic module.
The material of the light homogenizer 4 is transparent optic macromolecule synthetic resin, glass, quartz, or other materials which can transmit the sunlight. The process to make the light homogenizer 4 can be die-casting, grind, molding or injection, but not limited to these. Referring to
Because the height of the light homogenizer 4 and the height of the support member 3 are well designed, the lamination condition between the bottom of the light homogenizer 4 and the concentrated photovoltaic cell 11 can be controlled stably. Thus, the glue won't be pressed to overflow and attach to the side of the light homogenizer 4, which will cause the light leak.
The concentrated photovoltaic cell 11 of the present invention is disposed on the insulation base 12, which is prior art and won't be described in detail about the arrangement of the metallic electrodes therebetween.
Besides, the support member 3 provides a protection function to prevent the light homogenizer 4 from being attached by the external contaminant.
The concentrated photovoltaic receiver with a fixing structure of the present invention has many advantages. Through the support member supporting and positioning the light homogenizer, the light homogenizer won't incline or come off because of gravity or other factors during sun-tracing process of the concentrated photovoltaic module. Besides, the through hole of the support member corresponds in position to the concentrated photovoltaic cell and functions as a fixture for the light homogenizer, such that the light homogenizer can be connected to the concentrated photovoltaic cell at an accurate position and height. Through the structure of the support member, the present invention can also prevent the external mist, greasy dirt, dust or the like from adhering to the outer walls of the light homogenizer, such that the light homogenizer can keep a high efficiency of total reflection for a long time. For quick and accurate installation of the light homogenizer as well as better light efficiency and even light effect, the concentrated photovoltaic receiver with a fixing structure, the present invention, is very practical.
Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.
