DE102008013117A1 - Solar stove for cooking meals in e.g. bungalow, has photovoltaic cells covered with coated glass plate and spacer, and lower cover provided with spacer, where photovoltaic cells are connected with air inlet and heat outlet - Google Patents

Abstract

The stove has a photovoltaic cells (1) covered with a coated glass plate (2) and spacer, where a lower cover is provided with the spacer. The photovoltaic cells are connected with an air inlet and a heat outlet, where the heat outlet is connected with a heat-insulated pipe. An auxiliary air inlet is connected with an air filter. A wing cell heat pump has a rotor, which exhibits a rotor edge curve on both front sides. Four opposite rotor slots are provided in the rotor, where adjustable wings move in the slots and are fixedly connected with two thin bolts.

Description

The The invention relates to a sun cooker for cooking with solar energy and heat pump cooking with photovoltaic and Environmental heat also allows in closed rooms, such as in bungalows, campers, Wohnboten and the same with almost conventional comfort, but also in the smallest Form, as a mobile camping stove.

With the patent DE 3611375 a sun cooker is proposed, which is equipped with a mirror-shaped reflector which stands on a support post, and a holder for receiving the cooking pot. This cooking equipment must always be in the sun and it can only be cooked outdoors.

With the DE 3520694 a sun cooker is presented which is also equipped with a mirror-shaped reflector. This solar cooker is equipped with a frame in which the position of the sun can easily be readjusted. This advantage is bought with a complex and bulky frame.

A portable and portable solar cooker with hot water will be provided with the DE 19736223 shown. This solar cooker has a collapsible octagonal parabolic mirror, which is adjustable according to the position of the sun, in the focal point is a hotplate in which a spiral of copper pipe is attached. In this spiral, warm water can be prepared. Here, however, you have to decide what's up, warm water or cooking, both together is unfavorable with this system. If both are used together, then you can at least keep cooked food warm.

All Three solutions have one thing in common, they are very bulky, you do not come so close to the saucepan and it works only in bright sunshine with tracking to Sun. Even the cooks are constantly in the sun delivered, it takes longer than with a wood fire and is therefore rejected by users and will only in the extreme Emergency applied.

These disadvantages can be with the application of DE 3414442 be eliminated. This document describes a solar heated storage stove. By means of an optical device, sunlight is concentrated on a storage mass and brought to a high temperature. The storage mass is surrounded on all sides with a thick insulation, except the sunlight entry side. This storage stove is now placed in the sun all day and must be tracked to the position of the sun. After a sufficient heating time of the storage mass of the sunlight collector can be removed and the open storage mass can be covered with a thick insulation. Now the storage stove can be brought into closed rooms and the time of cake, roast or baking can be chosen freely, even after sunset.

Of the Disadvantage of the storage stove is that the release of heat while using not with a continuous same Intensity occurs. The users have to do this to adjust.

Should sufficient heat must be stored, so must the Storage mass be large and heavy, which is the disadvantage of this Cooking device is.

These Total disadvantages of the solar cooker can with this invention of the solar herd, or greatly diminished.

The The goal is with environmental heat, at any time of the day and also with cloudy skies, to cook water, or dine too without using a public network and without consuming a fuel.

The Essence of this invention is that the needed heat not be completely regenerated for the sun's hearth got to. For cooking, the incoming heat per square meter used flat, which is above and below the photovoltaic cells is created and by a novel two-stage Vane heat pump with self-steering and Self-sealing wings sucked and pumped up, whose electrical energy comes from the photovoltaic cells and as waste Cold is released to the environment.

The Cooking on a hot plate is not according to the invention with the electrical energy of the photovoltaic cells for an electric stove directly. This would require the surfaces of Photocells be much larger.

The Differential energy for the heat pump is relative low and is generated by an electric motor, soften the electric Energy from photovoltaic cells relates.

The Invention will be explained by examples, in more detail. The accompanying drawings show:

1 : the side view of the smallest mobile solar herd

2 : the front view.

3 : the top view with a diagonal cut through the two-stage vane heat pump.

4 : the front view with section through the two-stage vane heat pump.

5 : the front view with ring groove 20 the second stage with connections in X-ray view.

6 : the oblique view into the open housing from the left.

7 : the oblique view into the open housing from the right.

8th : the rotor 21 in an oblique view with an annular groove 20 and with wings 48 ' 48 ' ,

9 : the oblique front view of the wing 48 ' 48 ' with sealing tab 55 ' and thin bolts 52 ' 52 ' ,

10 : the side view of the wing 48 ' 48 ' ,

The visible main components of the solar herd are the photovoltaic cells 1 , which with coated glass plates 2 are covered. The coated glass plates 2 act like a heat valve and hold back the heat.

For solid buildings, the area of photovoltaic cells can be 1 also many square meters, since they can not always be aligned with the sun. For mobile facilities, such as caravans and mobile homes, the largest possible roof area should be used.

For a transportable Sonnenherd the area ranges from preferably one to one and a half square meters. But this area must now be aligned exactly with the sun. For this purpose, the photovoltaic cells must 1 on a stand 3 with rotating device 4 and their locking 5 , as well as a tilt joint 6 with a locking screw 7 to be attached. To secure the Standbockes fixing pins 8th' 8th' be beaten in the ground.

For exact alignment with the sun is an alignment rod 9 taken to the aid, which in the middle of the surface of the photovoltaic cells 1 , is inserted into a vertical hole.

Through the shadow of the alignment bar 9 the orientation to the sun can be controlled and with the turning device 4 , as well as the tilt joint 6 the exact orientation is set to the sun. Throws the alignment bar 9 no shadow, that's how the photovoltaic cells are 1 set perfectly to the sun.

The ambient air 10 , which are above the photovoltaic cells 1 located and through coated glass plates 2 is covered, it also heats up a bit in cloudy skies. The photovoltaic cells 1 be through spacers 59 to the coated glass plates 2 and the lower cover 60 fixed and with a frame 61 kept by including the air intake 37 and opposite the heat outlet 12 are located.

In bright sunshine, the photovoltaic cells can 1 assume very high temperatures, which thereby reduce the electrical power.

The air 11 below the photovoltaic cells 1 also warms up and gets together with the upper air 10 through a heat outlet 12 , over a thermally insulated pipe 13 by the shortest route, with a two-stage vane heat pump 14 with self-controlling and self-sealing wings 15 ' 15 ' sucked off and in the heating coils 16 condensed of the solar herd.

At the mobile sun cooker divorced directly on short way. In a stationary plant this heat-insulated pipe must 13 through the roof into the kitchen, as well as the power line 17 the photovoltaic cells 1 ,

The most important complex component is the innovative two-stage vane heat pump 14 which is not round in cross-section and has four equally sized virtual sectors.

Within a range of 90 ° is the housing 24 on the rotor 21 sealing against and opposite it describes a quarter circular arc, at a distance from a half-swinging wing 48 ' 48 ' , which sealingly on the inner housing 50 of the workroom.

The outer faces 49 ' 49 ' the wing 48 ' 48 ' have the same curvature as the inner case 50 in this area.

In the rotor 21 There are four opposite rotor slots 51 ' 51 ' in which the wings 48 ' 48 ' are precisely fitted and with the opposite wings 48 ' 48 ' with thin bolts 52 ' 52 ' are firmly connected. The thin bolts 52 ' 52 ' need to have matching holes from a rotor slot 51 ' 51 ' to be passed to the other.

The cylindrical rotor 21 has a rotor edge rounding on both sides 53 ' 53 ' whose radius is the stroke of the wings 48 ' 48 ' which also has the same rounding on the side surfaces a wing corner rounding 54 ' 54 ' exhibit.

The wings have on one side at the edges of a protruding continuous sealing tab 55 ' 55 ' , which acts self-sealing, because it presses against counter-pressure on the sealing surfaces.

The remaining inner surfaces of the housing 24 which from the extended to the retracted state of the wings 48 ' 48 ' are run as parabolic slideways 56 ' 56 ' formed in which through oblique passage slots 66 ' 66 ' the inlet 22 the vane heat pump 14 located and opposite are overflow slots 64 ' 64 ' with the outlet 23 connected.

By the rotational movement of the rotor 21 change the wings 48 ' 48 ' from the radial resting state, during a quarter turn, once in the retracted position and once in the extended position of the wing 48 ' 48 ' and now come in the area of radial movement.

By connecting the wings 48 ' 48 ' with the thin bolts 52 ' 52 ' Control yourself when the wing is outstretched 48 ' 48 ' with rotary motion now the area of the parabolic slideways 56 ' 56 ' achieved, it will be in the rotor 21 pushed in and pushes the opposite wing 48 ' 48 ' out. The opposite parabolic slideway 56 ' 56 ' supports the wing 48 ' 48 ' and centrifugal forces partially lift and reduce friction.

Due to the parabolic shape of the slide 56 ' 56 ' the wings move 48 ' 48 ' sinusoidal.

This means; initially the wings are moving 48 ' 48 ' slow, in the mute of the displacement sector, they are the fastest and at the end of the radial displacement move the wings 48 ' 48 ' slow again.

The integrated second stage 18 created by an annular groove 20 on a front side of the rotor 21 , One side of the ring groove 20 tangent to the lower edge of the milled rotor slots 51 ' 51 ' in the rotor 21 , The other side of the ring groove 20 tangent to the inside of the extended wing 48 ' 48 ' ,

The depth of the milled groove 20 determines the ability to swallow, but can only be limited to the vicinity of the thin bolts 52 ' 52 ' respectively. This creates the integrated second stage 18 , on the sector where the wings 48 ' 48 ' in the rotor 21 are retracted and on the back in the annular groove 20 retract and seal them around. At the opposite sector, where the wing 48 ' 48 ' is extended, he gives the ring groove 20 completely free. In this sector must be a sealing barrier segment 58 in the ring groove 20 protrude, which inside the housing cover 30 is attached.

Thus the integrated second stage 18 can work on the transition sectors of the inlet of the second stage 25 and the outlet of the second stage 26 on the outside of the housing end wall 30 be attached.

The thermally insulated pipe 13 gets to the inlet 22 the vane heat pump 14 Connected and promoted with each revolution, a certain amount of air through the outlet 23 in the windings of the heating coil 16 the stove top 46 and heat them by the heat of compression. The end of the heating spiral 16 gets to the inlet 25 the integrated second stage 18 connected.

This level has the swallowability of a tenth of what the vane heat pump 14 promotes. This results in a continuous compression of ten to one, at any speed. The compression can with the depth of the annular groove 20 in the rotor 21 be changed constructively.

There is no pressure relief valve, this function takes over the second stage 18 the vane heat pump 14 , which is integrated and needs no external volume.

At the outlet 26 the integrated second stage 18 comes the compressed air 27 for relaxation and the outlet pipe 28 gets very cold.

To the temperature of the ball bearings 29 ' 29 ' the vane heat pump 14 to limit and protect is the outlet pipe 28 with contact of the housing 24 from a front wall 30 , with the connections of the second stage, to the next end wall 31 guided. Is not shown in the drawing.

The outlet pipe 28 is then with a double heat conduction plate 32 connected, which has an A-position and a B-position. The A-position is used when the outside temperature is relatively low and there is no excess of heat.

In the A position of the dual heat conduction plate 32 the cold air of relaxation becomes in a line way 33 with the outlet pipe 28 drained into the open air.

In the other conduction path is unused residual heat, which is below the lower cover 34 the heating coils 16 forms, with a shielding plate 35 collected and via an air filter 36 to the air inlet 37 the photovoltaic cells 1 connected. This preheated air 38 got to now, controlled by the double heat conduction plate 32 , evenly over the entire photovoltaic cells 1 brush and absorb as much environmental heat as possible.

In this A position would be the photovoltaic cells 1 overwhelmed in midsummer, or in southern latitudes, would heat up too much and thus give off less electric power.

In this case, the double heat conduction plate 32 switched to B position. Now cold relaxation air flows 33 in the air intake 37 the photovoltaic cells 1 and prevents overheating.

If the sun's hearth is used only in southern latitudes and only in the B position, then there are two times the heat conduction plate 32 an additional air intake 63 and an air filter 36 necessary.

If there is no longer any pressure in the heating coils after a longer downtime 16 There is also the outlet of the second stage 26 , due to its low intake volume, also less air in the air intake 37 of the photovoltaic cells, as through the inlet of the vane heat pump 22 is sucked off. This difference must be from the additional air intake 63 be balanced until the full pressure in the heating coils is established.

In cloudy skies, or when the sun is not up in the sky and the photovoltaic cells are not providing enough electrical power, you can use a battery 39 , the electrical energy for the electric motor 40 , to drive the vane heat pump 14 used and buffered.

In the mobile sun cooker, the battery is enough 39 from a motorcycle. In motorhomes and residential boats is the on-board voltage. In the time when not cooking, the photovoltaic cells can 1 the battery 39 recharge.

If there is no electrical energy available for any reason, it may be on the motor shaft 41 of the electric motor 40 a crank 42 stuck and the electric motor 40 with two-stage vane heat pump 14 is manually turned by hand.

It makes sense, the speed of the electric motor 40 with a gear ratio 57 to increase. It takes about the power of 150 to 200 watts, so it is slightly more than the continuous power of a human. For this purpose, two people would have to share the work.

Falls the electrical power of the photovoltaic cells 1 abruptly, in the event of sudden dark clouds or a cable break in the power line 17 so would the two-stage vane heat pump 14 turn backwards.

The heat in the heating coils 16 would be mined very quickly. To avoid this, a freewheel must be used 62 be installed, which allows the rotational movement in one direction only.

The electric motor 40 is not designed for high speed, but more on a high torque, so it is short and the diameter is relatively large.

So that the electric motor 40 not so much with heat over the heat pump shaft 65 the vane heat pump 14 is loaded, the speed is transmitted via a Hardyscheibe 43 with a thick insulating layer 44 ,

The heating spirals 16 in which the heat due to the high pressure build-up of the vane heat pump 14 is generated by carrying elements 45 ' 45 ' worn, which in turn on the lower cover 34 rest.

The lower cover 34 is designed as a shell, with the stand 3 and its rotary device 4 attached and also throws some of the heat back on that food.

The heating spirals 16 are still not good for cooking, as the contact surfaces for a saucepan 47 too small, they are best for barbecues.

To a saucepan 47 or a pan a good thermal contact arises, the turns of the heating coil must 16 in a good heat-conducting stove 46 be incorporated.

Under certain circumstances, the heating power can be too much, so can with the rotating device 4 the sun stove are turned out of the sun.

This Sunshine is more complicated and more expensive than conventional ones Cooking equipment, but it does not consume resources, is crisis-proof and does not pollute the environment.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3611375 [0002]
• - DE 3520694 [0003]
• - DE 19736223 [0004]
• - DE 3414442 [0006]

Claims (26)

Sun cooker, which allows cooking with ambient heat and with photovoltaic cells, as a mobile oven in the open air, or even in roofed rooms, characterized in that the photovoltaic cells ( 1 ) with a coated glass plate ( 2 ) with spacers ( 59 ' 59 ' ) and also the lower cover ( 60 ) is provided with spacers. Sun cooker, according to claim 1, characterized in that the photovoltaic cells ( 1 ) with an air inlet ( 37 ) and a heat outlet ( 12 ), which with a thermally insulated tube ( 13 ) and an additional air inlet ( 63 ) with air filter ( 36 ) connected is. Sun stove, according to claim 1 to 2, characterized in that a novel two-stage vane heat pump ( 14 ), the upper air ( 10 ) and the lower air ( 11 ) with the inlet ( 22 ) are sucked in. Sun stove, according to claim 1 to 3, characterized in that the novel vane heat pump, a rotor ( 21 ), which on both end faces a Rotorkantenrundung ( 53 ' 53 ' ) having. Sun stove, according to claim 1 to 4, characterized in that in the rotor ( 21 ) four opposing rotor slots ( 51 ' 51 ' ) are incorporated, in which sliding wings ( 48 ' 48 ' ), which with the opposite two thin bolts ( 52 ' 52 ' ) are firmly connected. Sun stove, according to claim 1 to 5, characterized in that the wings ( 48 ' 48 ' ) a wing corner rounding ( 54 ' 54 ' ), which with the rotor edge rounding ( 53 ' 53 ' ) is identical. Sun stove, according to claim 1 to 6, characterized in that the outer end faces ( 49 ' 49 ' ) the wing ( 48 ' 48 ' ) have a curvature which with the inner housing ( 50 ) of the workspace matches. Sun stove, according to claim 1 to 7, characterized in that the wings ( 48 ' 48 ' ) a continuous and one-sided protruding sealing tab ( 55 ' 55 ' ), which with the recesses on the rotor ( 21 ) matches. Sun stove, according to claim 1 to 8, characterized in that the inside of the housing in the transition region in the form of a parabolic slideway ( 56 ' 56 ' ), which through oblique passage slots ( 66 ' 66 ' ) the inlet ( 22 ) of the novel two-stage vane heat pump ( 14 ) and to the outlet ( 23 ) with its overcurrent slots ( 64 ' 64 ' ). Sun stove, according to claim 1 to 9, characterized in that the housing ( 24 ) in a range of 90 ° on the rotor ( 21 ) fits tightly. Sun cooker, according to claim 1 to 10, characterized in that on an end face of the rotor ( 21 ) an annular groove ( 20 ) is milled, one side of which with the depth of the rotor slots ( 51 ) and the other side with the lower edge of the extended wing ( 48 ) is identical. Sun stove, according to claim 1 to 11, characterized in that the housing of the vane heat pump ( 24 ) an end wall ( 30 ) with the terminals of the integrated second stage ( 18 ) and an end wall ( 31 ) without connections, which with a flange ( 67 ) are screwed. Sun stove, according to claim 1 to 12, characterized in that the end wall ( 30 ) on the inside a blocking segment ( 58 ), which in the annular groove ( 20 ) of the rotor ( 21 ) and thus the pressure difference, the inlet ( 25 ) of the integrated second stage ( 18 ) and the outlet ( 26 ) of the second stage. Sun stove, according to claim 1 to 13, characterized in that the heat-insulating tube ( 13 ) with the inlet vane heat pump ( 22 ) and the outlet vane heat pump ( 23 ) is with the heating coils ( 16 ) connected. Sun stove, according to claim 1 to 14, characterized in that the other end of the heating coils ( 16 ), for the heat-conducting stove plate ( 46 ) with the inlet ( 25 ) is connected to the second stage. Sun stove, according to claim 1 to 15, characterized in that at the outlet ( 26 ) of the integrated second stage ( 18 ) a double heat conduction plate ( 32 ) connected. Sun stove, according to claim 1 to 16, characterized in that the two-fold heat conduction plate ( 32 ) has two switch positions, the A position once the cold relaxation air ( 33 ) with the outlet pipe ( 28 ) and with the other line path is residual heat, which is below the lower cover ( 34 ) of heating coils ( 16 ) forms with a shielding plate ( 35 ) and this preheated air ( 38 ) is passed through an air filter ( 36 ) in the air intake ( 37 ) of the photovoltaic cells ( 1 ) connected. Sun stove, according to claim 1 to 17 there characterized in that the double heat conduction plate ( 32 ) in the B position, the cold relaxation air ( 33 ) directly into the air intake ( 37 ) of the photovoltaic cells ( 1 ) switches. Sun stove, according to claim 1 to 18, characterized in that in the center of the photovoltaic cells ( 1 ) an alignment rod ( 9 ) and to align a tilt joint ( 6 ) with locking screw ( 7 ) and a rotary device ( 4 ) with locking ( 5 ) are mounted. Sun stove, according to claim 1 to 19, characterized in that the photovoltaic cells ( 1 ) with their alignment devices on a stand ( 3 ) and to ensure stability, are mounting pins ( 8th ) hit the ground. Sun stove, according to claim 1 to 20, characterized in that on the stand ( 3 ) the lower cover ( 34 ) for the heating coils ( 16 ), on which the carrying elements ( 45 ) of heating coils ( 16 ) rest. Sun stove, according to claim 1 to 21, characterized in that the heat conduction from the two-stage vane heat pump 14 over the motor shaft ( 41 ) of the electric motor ( 40 ) through an insulating layer ( 44 ) of the Hardy disk ( 43 ) is prevented. Sun stove, according to claim 1 to 22, characterized in that the electrical energy of the photovoltaic cells ( 1 ) with a battery ( 39 ) and the direction of rotation of the electric motor ( 40 ) with freewheel ( 62 ) is stabilized. Sun stove, according to claim 1 to 23, characterized in that in case of failure of the electric power of the drive of the two-stage vane heat pump ( 14 ) via a crank ( 42 ) with a gear ratio ( 57 ) he follows. Sun stove, according to claim 1 to 24, characterized in that the heat-insulated tube ( 13 ) and the power line ( 17 ) are passed through the roof in a suitable manner in closed spaces. Sun stove, according to claim 1 to 25, characterized in that in the front wall ( 30 ) and end wall ( 31 ) on the inside the negative rounding of the rotor corner rounding ( 53 ' 53 ' ) are incorporated.