CN109612134A - Compound parabolic surface sunlight reflecting condenser and its manufacturing method - Google Patents

Abstract

A kind of compound parabolic surface sunlight reflecting condenser and preparation method thereof, the condenser is combined into composite parabolic by the symmetrical left side and right one side of something, the length of curve of global sections can achieve 80% or more of ideal non-imaging concentrator length of curve, and the curved portion than the condenser of the prior art has more about 2/3.Production method is: condenser being symmetrically divided into two, the manufacture of idler wheel model is then carried out according to half of curve, and covers the molding rolling wheel cold rolling of grading profile with 10-16, planar metal strips are rolled into designed curve form by multiple tracks gradual change；Finally two half of condensers are symmetrically oppositely arranged and are assembled into complete condenser.The focusing ratio of condenser of the invention can achieve 3 times or more of the incomplete non-imaging concentrator of tradition, greatly improve spotlight effect.Increase and its quick cheap manufacture due to condenser focusing ratio, may be implemented the change for middle temperature solar heat collector market matter.

Description

Compound parabolic surface sunlight reflecting condenser and its manufacturing method

Technical field

The present invention relates to a kind of compound parabolic surface sunlight reflecting condenser and its manufacturing methods, belong to Photospot solar collection Hot device field.

Background technique

Non-image forming solar condenser has begun to the trial-production of theoretical exploitation and product in 1970s (US4002499A).Its basic theory has a wide range of applications in optically focused and lighting area.Equipped with full-glass solar energy vacuum collection Heat pipe application as shown in Figure 1, three kinds of sunlight ray 3(figure a are scattering light, scheme to be oblique ray in b, scheme to be direct light in c Line) be reflected into the effective sunlight on thermal-collecting tube 2 through condenser 1 ratio it is lower, actual focusing ratio is typically less than 0.6.Explanation Existing non-imaging concentrator is in terms of solar thermal utilization often using the very little of theoretical ideal non-imaging concentrator A part.Wherein concentrator section keeps cheap, this condenser has selected non-using small part ideal for windage The curve of imaging concentrator carries out optically focused.1/3 length of this part less than ideal condenser curve.Largely limit The focusing ratio of condenser.

As shown in Fig. 2, ideal non-imaging concentrator is made of the bold portion 1a and dotted portion 1b two parts of lower part , wherein most curve (the dotted portion 1b in figure) has ignored (central circular in figure is absorber 2) by the prior art. This is because when existing non-tracking solar concentrating collector composite parabolic uses cold rolling technology, due to using whole A composite parabolic cold rolling production, fails the Cost Obstacles for breaking through non-imaging concentrator manufacture, is limited to the size of rolling wheel, It can not achieve height required for non-imaging concentrator.As shown in figure 3, the rolling wheel 4 that traditional technology uses can only guarantee small portion Point non-imaged ideal condenser curve (the bold portion 1a in Fig. 2, this partial trace part be whole non-imaging concentrator not The realization of foot 1/3), can not make entire condenser shown in Fig. 2.So absorber 2 is restricted from greater than 47mm diameter glass The focusing ratio of glass pipe, condenser is not more than 0.6.Power promise Rett product is Typical Representative.Such technology is at 150-250 DEG C of medium temperature Using when efficiency it is lower.Therefore, it is necessary in the composite parabolic non-tracking solar energy of invention major diameter absorber high concentration ratio Warm heat collector.And it can the production of scale low cost.

Summary of the invention

It is an object of the invention to provide a kind of compound parabolic surface sunlight reflecting condenser and its manufacturing methods, to solve Required insufficient height existing for existing non-imaging concentrator and the problem for causing focusing ratio low.

The technical scheme is that

A kind of compound parabolic surface sunlight reflecting condenser, which is characterized in that be combined by the symmetrical left side and right one side of something Composite parabolic, the length of curve of global sections can achieve 80% or more of ideal non-imaging concentrator length of curve, than existing The curved portion of the condenser of technology has more about 2/3.

Matched with the absorber for D in application, condenser opening width W can reach 4.82D, section depth H is reachable 2.88D, sunlight incidence receiving angle are ± 40 °-± 50 degree, and focusing ratio can achieve 1.35-1.55；The absorber is placed in multiple In the focal axis for closing parabolic condenser.

The reflector base metal of the condenser selects the galvanized steel plain sheet or aluminium sheet coiled material of 0.3mm-0.6mm thickness, at it The pre-coated mirror surface reflective aluminizer of reflective surface, carries out cold rolling thereafter.It is a kind of to make the compound parabolic surface sunlight The method of reflecting condenser, which comprises the following steps:

(1) the symmetrical curved portion of condenser is divided into two from line of symmetry first, then by the curved portion of half It is rotated；

(2) molding that the top in shape of 10-16 set grading profile is produced according to the curved portion of above-mentioned postrotational one side of something rolls Wheel；

(3) planar metal strips are rolled into the half of condenser of designed curve form by multiple tracks gradual change；

(4) two half of condensers are symmetrically oppositely arranged to the composite parabolic sunlight collector for being assembled into complete curve.

The invention has the advantages that the non-imaging concentrator made of method of the invention, focusing ratio can achieve biography 3 times or more of incomplete non-imaging concentrator of uniting can achieve 80% or more of ideal non-imaging concentrator length of curve.Pole Big improves spotlight effect, improves the heat-collecting temperature of solar thermal collector or similar application.Due to condenser focusing ratio Increase and its quick cheap manufacture, may be implemented the change for middle temperature solar heat collector market matter.

Detailed description of the invention

Fig. 1 is the solar collector pipe composite parabolic reflecting condenser operation principle schematic diagram of the prior art, and wherein a figure is Scattering light is oblique ray in b figure, is direct line in c figure；

Fig. 2 is the whole curve synoptic diagram of ideal non-imaging concentrator；

Fig. 3 is the rolling wheel appearance schematic diagram of the existing molding for part non-imaged ideal condenser；

The cross section structure schematic diagram of solar collector pipe composite parabolic reflecting condenser Fig. 4 of the invention；

Fig. 5 is the cross section structure schematic diagram after the half of curve rotation proper angle in Fig. 4；

Fig. 6 is shaping roller outline structural diagram used by curve half of according to Fig.5, of the invention；

Fig. 7 is the right view of Fig. 6；

Fig. 8 is that the part of two half of curves made of the present invention is butted into the process schematic diagram of entire finished product condenser.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.Referring to fig. 4, composite parabolic reflecting condenser 10 of the invention is routinely Non-imaging concentrator Theoretical Design, left and right partial symmetry, left one side of something dotted line 10a, right one side of something curve 10b, integrated curved length can To reach 80% or more of ideal non-imaging concentrator length of curve, than the curved portion (in Fig. 2 of the condenser of the prior art Bold portion 1a) about 2/3 is had more, position and the function of absorber (glassy metal evacuated solar collecting tube) 2 and condenser bracket 5 It can be same as the prior art.The diameter D of absorber 2 for diameter greater than 80mm, condenser opening width W are reachable to be can reach 4.82D, section depth H are up to 2.88D, and sunlight incidence receiving angle is ± 40 °-± 50 degree, and focusing ratio can achieve 1.35- 1.55。

The reflector base metal of the composite parabolic reflecting condenser 10 selects the plating of 0.3mm-0.6mm thickness Zinc steel plate or aluminium sheet coiled material carry out cold rolling in the pre-coated mirror surface reflective aluminizer of its reflective surface thereafter.

Referring to figure 5-8, using routine techniques be can not make (shown in Fig. 4) of the invention above-mentioned solar collector pipe it is compound Parabolic reflector condenser.Technique of the invention and corresponding device must be used, the specific method is as follows:

1, the symmetrical curve of condenser 1 shown in Fig. 4 is divided into two first, then by half (by taking left one side of something as an example) Curved portion is rotated, and rotation angular dimension, which is subject to, is easy roll forming (degree of drawing even is close, belongs to routine techniques), 145 ° -155 ° (or going to identical position counterclockwise) are about rotated clockwise, as shown in Figure 5.

2, go out the molding rolling wheel of the top in shape of 10-16 set grading profile according to above-mentioned postrotational curve plotting, finally A set of rolling wheel 6 as shown in Figure 6 and Figure 7,6 cold rolling equipment of rolling wheel usually by by planar metal strips by multiple tracks gradually Become and is rolled into designed curve form (belonging to routine techniques).

Two of roll forming symmetrical part 10a and 10b are oppositely arranged (as shown in Figure 8), then with connector (Fig. 4 In bracket 5) left one side of something 10a and right one side of something 10b be spliced into a complete composite parabolic sunlight collector 10.

Claims (4)

1. a kind of compound parabolic surface sunlight reflecting condenser, which is characterized in that combined by the symmetrical left side with right one side of something At composite parabolic, the length of curve of global sections can achieve 80% or more of ideal non-imaging concentrator length of curve, than existing There is the curved portion of the condenser of technology to have more about 2/3.

2. compound parabolic surface sunlight reflecting condenser according to claim 1, which is characterized in that with the heat absorption for D Body matches in application, condenser opening width W can reach 4.82D, and section depth H is up to 2.88D, sunlight incidence acceptance angle Degree is ± 40 °-± 50 degree, and focusing ratio can achieve 1.35-1.55；The absorber is placed in the focal axis of compound parabolic concentrator On.

3. compound parabolic surface sunlight reflecting condenser according to claim 1, which is characterized in that the condenser it is reflective Plate base metal selects the galvanized steel plain sheet or aluminium sheet coiled material of 0.3mm-0.6mm thickness, in the pre-coated mirror surface reflective plating of its reflective surface Aluminium film carries out cold rolling thereafter.

4. a kind of method for making compound parabolic surface sunlight reflecting condenser described in claim 1, which is characterized in that including Following steps:

(1) the symmetrical curved portion of condenser is divided into two from line of symmetry first, then by the curved portion of half It is rotated；

(2) molding that the top in shape of 10-16 set grading profile is produced according to the curved portion of above-mentioned postrotational one side of something rolls Wheel；

(3) planar metal strips are rolled into the half of condenser of designed curve form by multiple tracks gradual change；

(4) two half of condensers are symmetrically oppositely arranged to the composite parabolic sunlight collector for being assembled into complete curve.