CN201096909Y - A solar focusing reflective board - Google Patents

Abstract

The utility model discloses a solar energy light condensing reflection board in the solar energy heat collecting device field. The shape of the light reflecting surface of the light condensing reflection board is a spatial curved surface, the cutting line of the spatial curved surface is a symmetrical curved line that the vertical line of the polar axis which can pass the pole in the polar coordinates system is taken as the symmetric axis, the cutting line at one side of the symmetric axis is composed of more than three sections of parabolas which are connected in sequence, and each section of parabola corresponds to the best sunlight reflecting value of a time quantum. The entire solar energy light condensing reflection board can get the best condensing effect, and the thermal efficiency can be enhanced; the solar energy light condensing reflection board can be taken as the light condensing reflection board of each non-tracking type solar energy heat collector, the light condensing and light reflecting board in the heat collecting pipe, and the light condensing reflection board of the non-tracking type solar oven, etc.

Description

A kind of solar light gathering baffle-board

Technical field

The utility model relates to solar energy utilization technique.

Background technology

Utilize light gathering baffle-board with more large-area sunlight reflected to heat collection device, to strengthen Heat-collecting effect, improve the temperature of medium in the heat collection device, the existing many people of this problem obtain achievement in research, the employing V-arrangement reflector that has, the employing transversal that has is the barrel-shaped reflector of circular arc, and adopting transversal in addition is the curved reflector that the circular arc of different curvature radius is formed by connecting, and the employing transversal that also has is reflector of the involute urve of circle or the like.

As non-tracking mode light gathering baffle-board in the middle of one day since the solar angle degree change greatly, the sunlight that can not reflex on the heat collection device is still many, still can not reach satisfied spotlight effect, allow a part of high light run away often and some weak light have been captured.

The utility model content

The purpose of this utility model is to design a kind of solar light gathering baffle-board, makes it to greatest extent the light that arrives reflecting plate be reflexed to the heat collection device surface.

The purpose of this utility model is achieved like this: a kind of solar light gathering baffle-board, the reflective surface of described light gathering baffle-board is shaped as a space curved surface, the transversal of described space curved surface is that the vertical line with the pole axis of crossing limit is the symmetrical curve of axis of symmetry in the polar coordinate system in the plane, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections ₀, L ₁, L ₂L _iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L _iEstablish an equation under satisfying:

Wherein, i=0,1,2,3,4,5......;

ρ is that the some distance to the extreme on the para-curve is utmost point footpath;

P _iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;

0 is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;

The deflection angle of  parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;

L ₁With L ₀Intersection point A ₁(ρ ₁, θ ₁)

L ₂With L ₁Intersection point A ₂(ρ ₂, θ ₂)

L _iWith L _I-1Intersection point A _i(ρ _i, θ _i)

Para-curve L ₀The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L ₀Not rotation, rotation angle  ₀Be 0;

Para-curve L ₁The relative L of axle ₀The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is  ₁, the title deflection angle is  ₁

θ ₁Corresponding  ₁: because the point of arrival (ρ ₁, θ ₁) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line is  with the between perpendiculars angle of the pole axis of crossing limit ₁,  in other words ₁Determine by physical parameter; Deflection angle  ₂,  _iThe rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit ₀Axle;

Para-curve L ₂Deflection angle is  ₂

Para-curve L _iDeflection angle is  _i

Adjacent parabolical burnt parameter P value establishes an equation under satisfying:

Wherein: i=0,1,2,3

 ₀＝0 0＜ ₁＜ ₂＜ ₃＜……＜ _i。

The utility model employing plurality of sections para-curve continues and forms the reflective surface transversal of a light gathering baffle-board, with any solar incident ray that the parabolic bobbin parallels, all can converge to corresponding parabolic focus, because being arranged on limit place (also being each para-curve focus place) heat collecting element itself has certain volume, the angle of event and corresponding parabolic bobbin all can be reflexed on the heat collecting element by this parabolic segment reflective surface less than the solar incident ray of certain value, this light gathering baffle-board converges incident ray strong relatively in the back before midday certain hour scope to obtain the spotlight effect with respect to other shape optically focused reflective surface the best, each parabolic segment is because different at a distance of the distance of focus, so the time length and the zero-time of the sunshine after converging before midday in the certain hour scope are different, and the solar incident ray that is arrived on each parabolic segment reflective surface strong relatively that of its sunlight strength in whole period all reflection converge to the heat collecting element surface, its collecting efficiency is higher, the unnecessary tracking means that costliness is set.With space curved surface described in the utility model as reflective caustic surface owing to be non-tracking, in fact also have in one day a certain amount of weak relatively sunray can not optically focused to heat collecting element, but has best spotlight effect in theory as the reflective caustic surface of Nontracking with space curved surface described in the utility model, because any one section curved surface of space curved surface described in the utility model in theory all can accomplish the solar incident ray that is arrived on this section reflective surface strong relatively that of its sunlight strength in whole period all reflection converge to the heat collecting element surface, and the reflective caustic surface reflection of other shape to converge its light of solar incident ray in a period of time of same length be not light in that a period of time the strongest in one day.The utility model can be used as light gathering baffle-board, the concentration inverse light panel in the thermal-collecting tube of various Nontracking solar heat collectors, light gathering baffle-board of Nontracking solar kitchen range etc.

Above-mentioned space curved surface can have following two kinds of structures, and one is, to be described transversal along the vertical direction on its plane, place stretch space curved surface forms.The focus of each transversal stretches in line, along this straight line solar energy heat collection pipe can be set, and makes the Nontracking solar heat collector.It two is, described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry of described transversal.Each transversal has a public focus (limit), can heat collecting element be set on focus, makes the Nontracking solar kitchen range.

Description of drawings

Fig. 1 is the utility model schematic diagram;

Fig. 2 is the transversal synoptic diagram of reflective surface;

Embodiment

Embodiment 1

As Fig. 1, be a kind of solar light gathering baffle-board, the reflective surface of described light gathering baffle-board is shaped as a space curved surface, and the transversal of this space curved surface is the symmetrical curve of axis of symmetry for the pole axis vertical line with mistake limit in the polar coordinate system in the plane, the para-curve L that three sections orders of the transversal of described axis of symmetry one side link to each other ₀, L ₁, L ₂L _iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L _iEstablish an equation under satisfying:

Wherein, i=0,1,2,3;

ρ is that the some distance to the extreme on the para-curve is utmost point footpath;

P _iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;

θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;

The deflection angle of  parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;

L ₁With L ₀Intersection point A ₁(ρ ₁, θ ₁)

L ₂With L ₁Intersection point A ₂(ρ ₂, θ ₂)

L ₃With L ₂Intersection point A ₃(ρ ₃, θ ₃)

Para-curve L ₀The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L ₀Not rotation, rotation angle  ₀Be 0;

L ₀Mathematic(al) representation:

$\mathrm{\ρ}=\frac{P_0[1+\mathrm{Sin\θ}]}{{\mathrm{Cos}}^2\mathrm{\θ}}$

For the light gathering baffle-board in qualification is installed on transparent Circular glass pipe, generally can be with para-curve L ₀The chord length B of overfocus and the string vertical with the parabolic bobbin ₁B ₂As the breadth extreme of the incident ray family that wants to assemble, get B ₁B ₂=2P ₀, P ₀Also equal para-curve L ₀The summit to two times of focal length; For the light gathering baffle-board of unqualified space condition, the breadth extreme of the incident ray family that wants to assemble can be greater than 2P ₀

L ₁Mathematic(al) representation:

Para-curve L ₁The relative L of axle ₀The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is  ₁, the title deflection angle is  ₁

θ ₁Corresponding  ₁: because the point of arrival (ρ ₁, θ ₁) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line is  with the between perpendiculars angle of the pole axis of crossing limit ₁,  in other words ₁Determine by physical parameter; Deflection angle  ₂,  _iThe rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit ₀Axle;

Para-curve L ₂Deflection angle is  ₂

Para-curve L _iDeflection angle is  _i

Adjacent parabolical burnt parameter P value establishes an equation under satisfying:

Wherein: i=0,1,2,3

 ₀＝0 0＜ ₁＜ ₂＜ ₃。

To be described transversal along the vertical direction on its plane, place stretch described space curved surface forms.

At para-curve L ₀Last A ₁Point is ∠ PA for the subtended angle of heat collector ₁R=α, and arrive A ₁The incident ray of point is distributed in the β angular region, and β＞α establishes A ₁M is parallel to para-curve L ₀Axle, heat collector can only receive and arrive A ₁Point is established ∠ PA smaller or equal to the incident ray in the α angular region ₁This is to arrive A among one day for Q=α ₁Point is no more than the strongest light of angle α scope, A ₁N is ∠ PA ₁The angular bisector of Q makes ∠ MA ₁N= ₁Arrive A in other words ₁The average incident angle of light the strongest in the middle of one day that point may be received by heat collector is by being parallel to straight line A ₁The incident ray representative of N.

If we will be through A ₁A certain parabolical P value of point changes, focus still at O point and parabolical rotate  ₁The angle so just can make ∠ PA ₁Incident ray in the Q scope reflexes to ∠ PA like clockwork ₁The R scope.With the O point is center rotation  ₁The new para-curve at angle is L ₁Para-curve.

A on para-curve ₁Point is each point left, and the average incident angle of the incident ray that is arrived all is to be parallel to para-curve L ₀The axle incident ray be representative, so A ₁Point is L left ₀Para-curve is best, needn't rotate.

A on para-curve ₁Point is crossed A to the right ₂New para-curve of point still is focus rotation  with O ₂The angle, its burnt parameter P changes into P ₂, new para-curve is L ₂, same reason also can guarantee to arrive A in one day ₂The strongest light on the point and the heat collector that can be reflected to the certain space size that satisfies the requirements does not converge to the heat collector surface with not omitting in theory.

By that analogy, when transversal is made up of the para-curve more than three sections, the para-curve of corresponding some the bests of some spots.A ₁Point is at L ₁On the para-curve, A ₂Point is at L ₂On the para-curve, A _iPoint is at L _iOn the para-curve, if the enough big following new curve of i just can accurately assemble sunlight as much as possible to the heat collector until reaching best in theory convergent effect.

New curve is continued by following point and following para-curve and forms:

L ₀-A ₁(point)-L ₁-A ₂-L ₂-A ₃-...-A _i-L _i

If the i value is enough big, what the new curve of above-mentioned new curve and following expression just do not have respectively:

L ₀-A ₁(point)-A ₂-A ₃-A _i

Like this, the transversal of this curved surface reflector can be made up of the plurality of sections parabolic segment, crossing the vertical line of initial point perpendicular to pole axis is that each section transversal line of Y-axis both sides is symmetrical, as shown in Figure 2, the all corresponding the strongest incident ray of a period of time of each section reflector, the combination of its integral body can obtain best spotlight effect.To be described transversal along the vertical direction on its plane, place stretch described space curved surface forms, the focus of each transversal of this curved surface reflector (being the parabolical public focus of each section) stretches in line, along this straight line solar energy heat collection pipe can be set, can be made into the Nontracking solar heat collector.

Embodiment 2

Another solar light gathering baffle-board, the reflective surface of described light gathering baffle-board is shaped as a space curved surface, the transversal of this space curved surface is the symmetrical curve of axis of symmetry for the pole axis vertical line with mistake limit in the polar coordinate system in the plane, described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry Y-axis of described transversal; The transversal shape still can be as shown in Figure 2, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections ₀, L ₁, L ₂L _iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L _iEstablish an equation under satisfying:

Wherein, i=0,1,2,3,4,5......;

ρ is that the some distance to the extreme on the para-curve is utmost point footpath;

P _iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;

θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;

The deflection angle of  parabolic bobbin (being parabolical axis of symmetry) refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;

L ₁With L ₀Intersection point A ₁(ρ ₁, θ ₁)

L ₂With L ₁Intersection point A ₂(ρ ₂, θ ₂)

L _iWith L _I-1Intersection point A _i(ρ _i, θ _i)

Para-curve L ₀The between perpendiculars angle of pole axis of axle (being axis of symmetry) and polar coordinate system in the plane be 0, i.e. para-curve L ₀Not rotation, rotation angle  ₀Be 0;

Para-curve L ₁The relative L of axle ₀The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is  ₁, the title deflection angle is  ₁

θ ₁Corresponding  ₁: because the point of arrival (ρ ₁, θ ₁) the average incident angle of locating strong relatively incident ray is representative with such straight line, this straight line is  with the between perpendiculars angle of the pole axis of crossing limit ₁,  in other words ₁Determine by physical parameter; Cross the vertical line para-curve L just of the pole axis of limit ₀Axle;

Para-curve L ₂Deflection angle is  ₂

Para-curve L _iDeflection angle is  _i

Adjacent parabolical burnt parameter P value establishes an equation under satisfying:

Wherein: i=0,1,2,3

 ₀＝0 0＜ ₁＜ ₂＜ ₃＜……＜ _i；

Each transversal parabolic segment has a public focus (limit), can heat collecting element be set on focus, makes the Nontracking solar kitchen range.

Claims (3)

1, a kind of solar light gathering baffle-board, it is characterized in that: the reflective surface of described light gathering baffle-board is shaped as a space curved surface, the transversal of described space curved surface is the symmetrical curve of axis of symmetry for the vertical line with the pole axis of mistake limit in the polar coordinate system in the plane, the para-curve L that the transversal of described axis of symmetry one side is linked to each other by order more than three sections ₀, L ₁, L ₂L _iForm, each parabolic focus all is positioned at the limit of polar coordinate system in the plane, each section para-curve L _iEstablish an equation under satisfying:

Wherein, i=0,1,2,3,4,5......;

ρ is that the some distance to the extreme on the para-curve is utmost point footpath;

P _iBe parabolical burnt parameter, be corresponding parabolical summit two times to focal length;

θ is the polar angle or the argument of the point on the para-curve in the polar coordinate system, 90 °＜θ≤270 °;

 is the deflection angle of parabolic bobbin, refers to that the parabolic bobbin is the angle that the center rotates in the counterclockwise direction with the limit;

L ₁With L ₀Intersection point A ₁(ρ ₁, θ ₁)

L ₂With L ₁Intersection point A ₂(ρ ₂, θ ₂)

L _iWith L _I-1Intersection point A _i(ρ _i, θ _i)

Para-curve L ₀The between perpendiculars angle of axle and the pole axis of polar coordinate system in the plane be 0, at this moment, para-curve L ₀Not rotation, rotation angle  ₀Be 0;

Para-curve L ₁The relative L of axle ₀The axle in the counterclockwise direction the rotation, rotation center is the limit of polar coordinate system in the plane, the angle of rotation is  ₁, the title deflection angle is  ₁

θ ₁Corresponding  ₁: the point of arrival (ρ ₁, θ ₁) the average incident angle of locating strong relatively incident ray is representative with following straight line, this straight line is  with the between perpendiculars angle of the pole axis of crossing limit ₁Deflection angle  ₂,  _iThe rest may be inferred; Cross the vertical line para-curve L just of the pole axis of limit ₀Axle;

Para-curve L ₂Deflection angle is  ₂

Para-curve L _iDeflection angle is  _i

Adjacent parabolical burnt parameter P value establishes an equation under satisfying:

Wherein: i=0,1,2,3

 ₀＝0 0＜ ₁＜ ₂＜ ₃＜……＜ _i。

2, solar light gathering baffle-board according to claim 1 is characterized in that: to be described transversal along the vertical direction on its plane, place stretch described space curved surface forms.

3, solar light gathering baffle-board according to claim 1 is characterized in that: described space curved surface is that described transversal rotation forms, and turning axle is the axis of symmetry of described transversal.

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