CN1254825A

CN1254825A - Plate material for heat exchanger and production method thereof

Info

Publication number: CN1254825A
Application number: CN 99124851
Authority: CN
Inventors: 埃伯哈德·保罗
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-11-20
Filing date: 1999-11-19
Publication date: 2000-05-31
Also published as: CA2290230A1; JP2000153551A; DE19853526A1; KR20000035597A

Abstract

Method of producing heat transfer plates, wherein the plates are shaped such that they comprise cavities for the passage of air. The plates are produced of heated synthetic material, in particular foils of synthetic materials, in a deep drawing method by using compressed air. The cavities of the plates form flow channels in which a lateral displacement exists at least in parts of their axial extension. When the plates are disposed on top of one another, said displacement abuts an edge of a flow channel of the plate arranged above or below.

Description

Plate material for heat exchanger and production method thereof

The method that the present invention relates to a kind of plate material for heat exchanger and produce the plate material for heat exchanger of a heat exchanger.

The heat exchanger that is used for various different purposes is known.Its basic effect is by a kind of cryogenic media high-temperature medium to be cooled off, and wherein first kind of medium is heated or is cooled.Just being in contact with one another between usually, need not medium can realize this conversion.Heat exchanger is generally used for the house, and cold fresh air enters in these houses in heat exchanger by the heated air heat that flows out.German patent DE 43 33 904 discloses a kind of such heat exchanger.This cross section in particular for heat exchanger two kinds of overcurrent liquid, that have parallel flow channels is to be made of the plate with the mutual stacked setting of waveform shape.The plate of putting wherein covers on the flow channels that is positioned at the plate under it.The flow channels that side direction is adjacent can flow through different fluids.These plates are made of thin metallic plate.The manufacturing expense of waveform section bar is very high.

German patent DE 296 20 248 U1 disclose a kind of counter-flow heat exchanger of being made by plastics or sheet metal.This heat exchanger is made up of the thin plate of special shape.The shape of cross section of sheet metal is zigzag, and wherein the section bar of two boards material tip faces toward mutually and slides mutually for fear of section bar, always makes tooth have uniform distances at double height size and width.Next piece plate is supported on these teeth.It is less that these saw-toothed shape are used for heat conducting area.The tooth of double height size structure has still lost some heat exchange areas.

BP GB1 336448 discloses a kind of heat exchanger, and this heat exchanger is made of the heap of the sheet material of paired connection.The cross section of sheet material has curved shape.The flow channels that connects and composes by the two boards material.Crooked shape of cross section also can only form little heat exchange area.In addition, the intersection overcurrent is less than the heat flow density of counter-flow heat exchanger.

The objective of the invention is to develop a kind of production method of sheet material of simple heat exchanger, and improve the shape of sheet material, thereby optimize the heat conduction and provide stable support for stacked sheet material mutually.

Solved the foregoing invention purpose by a kind of method of producing plate material for heat exchanger, promptly sheet material has been had be used for the hollow space of fluid overcurrent by moulding, sheet material wherein is by plastics, and especially sheet plastic is made through deep drawn under pressed gas.Liquids and gases, especially air can be used as suitable fluid.Plastic material is easier to distortion than metal material and extends in the deep drawn process.If further sheet plastic or plastics are heated, in the deep drawn process, they will be easier to be shaped than sheet metal or metal.Adopt the advantage of pressed gas to be, compare with the pure vacuum technology, can obtain 8-9 doubly act on pressure on the mould.This will cause higher formed precision.Utilize high pressure can obtain to have the sheet material shape of complex geometric shapes, thereby obtain big heat exchange area.This high pressure can also make utilization become possibility than the plastics that PVC more is of value to environment.Be also to be referred to as high pressure or plasma deep drawn what this it is again emphasized that by the deep drawn of pressure (vacuum).In order to reach the formed precision that uniform extension is become reconciled,, can only suitably heat the sheet plastic of wanting moulding owing to utilize compressed air in the method for the invention.On the upper surface of mould, can only cool off processed sheet plastic a little, obtain the desirable strength of sheet plastic and distortion uniformly thus.

In most preferred embodiment of the present invention, utilize this method sheet plastic to compare and prolong 80%-300% with original material.Thus with original material mutually specific area increased by 3 times, the area of increase helps heat transfer process.In addition, the wall thickness of thin plate extends thus and descends sharp, so just can improve the heat exchange between the two media that flows in heat exchanger.

In the method embodiment of a variation, with a kind of non-flammable polypropylene as sheet plastic.From ecological angle, polypropylene is accepted than PVC is easier.In addition, compare with PVC, polypropylene has thermal conductivity and temperature stability preferably.Certainly, also can use polystyrene, polyethylene, poly-methyl acrylate or polycarbonate to use as plastics.

The variation according to the present invention of this method comprises sheet material is coupled together mutually airtightly in forward edge and lateral edges place, thereby prevents that medium from mixing mutually.

This method be on the other hand, interconnect by bonding, extruding, thermal weld, pulse welding, ultrasonic bonding or vibrations welding, guarantee the airtight connection of sheet material with this.

The feature of heat exchanger of the present invention also is supporting each other of sheet material relative edge, and this is very useful for be used for flow channels the occasion of high pressure being arranged.The life-span of the heat exchanger of making thus is longer than the life-span of metal heat exchanger.

The feature of the embodiment of sheet material also is, constitute flow channels with hollow space, be provided with a laterally offset part that constitutes in one section mode at least on vertically flow channels whole, when sheet material was mutually stacked, this Offset portion constituted on an edge of flow channels for the position thereon or the support of the sheet material under it.The advantage of laterally offset part be overcurrent in the flow channels in the offset portion office by disturbance.This disturbance makes mobile medium produce eddy current, thereby improves thermal conductivity factor.In addition, Offset portion has also prolonged flow path.Long flow process means that the remaining time in heat exchanger is long, and then causes heat exchanger time long.Another benefit of Offset portion is, can avoid the staggered slip of two mutual stacked sheet materials.Offset portion can relatively be lacked or extend on the whole length of sheet material.

In a particularly advantageous embodiment, flow channels is extended along straight line, jaggies, curve or serpentine in a level or vertical plane.The shape of this flow channels makes and turns round from the direction of streamlined flow, improves thermal conductivity factor thereby the variation of this direction produces eddy current.This turning round can also prolong medium and be retained in time in the heat exchanger, thereby prolongs heat exchanger time.

In a kind of embodiment of further change, flow channels is stacked across mutually.Medium can enter another adjacent planar from a plane on the crosspoint, so just can produce spiral flow.Flow channels is configured to and can guarantees that the different medium that flows through heat exchanger particularly can not mix mutually between a plane and two plane.

Accompanying drawing below in conjunction with performance essential characteristic of the present invention further describes further advantage of the present invention and feature by following description to embodiments of the invention.Each feature all can be individually or is applied to embodiments of the invention arbitrarily in combination.

Represent the embodiment that is used for heat exchanger according to of the present invention in the mode of simplified schematic greatly among the figure, and it is described in detail.Wherein:

Fig. 1 represents the perspective view of a heat exchanger of being made by many method according to this invention that sheet material constituted;

Fig. 2 represents the perspective view of two grooved profiles;

Fig. 3 represents to pass the cross section that has the grooved profile of the sheet material laterally offset part, mutual stacked by three;

Fig. 4 represents to have the perspective view of the sheet material of crooked passage;

Fig. 5 represents to have the vertical view of the sheet material of ramp way;

Fig. 6 represents to have the vertical view of the sheet material of zigzag passage, and the passage that wherein is positioned at the below is represented by dotted lines.

Fig. 1 represents a heat exchanger 10 that is made of five mutual stacked

sheet materials

11,12,13,14,15.Each

sheet material

11,12,13,14,15 all comprises a base surface 16 that has the octagonal plane, and each sheet material has corresponding structure shown in the accompanying drawing with the back.Base surface 16 also can have other flat shape (for example, hexagon).Around base surface 16, be provided with perisporium 17, the angle of one-tenth 90 °＜Φ＜180, plane of perisporium 17 relative base surfaces 16 °.The edge 18 that extends with the plane parallel at base surface 16 places is connected on the perisporium 17.Edge 18 terminates in distolateral edge 1 and lateral edges 2.18 places link to each other two adjacent sheet materials airtightly at the edge.The perisporium 17 at the edge 18 under having disconnects at

sheet material

19,20 the shortest relative side places.

What Fig. 2 represented is a kind of

grooved profile

30,31 of upper and lower base surface, and this section bar is made through the high pressure deep drawn by plastic material.Two sheet materials that have a

grooved profile

30,31 are in contact with one another can constitute a heat exchanger with flow channels 32, described flow channels has rectangle or foursquare cross section.Last grooved profile 30 is covered down on the flow channels of grooved profile 31 and can constitute flow channels 32.For fear of

grooved profile

30,31 interlaced slips, an Offset portion 33 to the right is set in last grooved profile 30, in the grooved profile 31 Offset portion 34 left is being set down.

Fig. 3 represents a cross section that passes three mutual stacked

grooved profiles

30,31,35 as shown in Figure 2, and this cross section is positioned in the plane that comprises Offset portion 33,34.Relativity shift part 33 is passed Offset portion 34 to the right, grooved profile 30 firmly can be supported on the grooved profile 31.Can be on this position that grooved

profile

30,31 is bonding mutually or weld together.The heat exchanger that obtains like this is highly suitable for having in the flow channels the very occasion of high pressure, on the other hand, also has only very little slit between edge 40 and 41.Medium just can enter another plane from a plane like this, thereby forms spiral flow and form turbulent flow subsequently, and this is very useful for heat transfer process.

Fig. 4 represents a grooved profile 50 with flow channels 51, and flow channels 51 also has the cross section of square or rectangle.Medium flows into a front portion 52 along predetermined first direction, and then enters the second direction that tilts to extend with it and enter mid portion 53 from the first direction conversion.Medium turns back original first direction again in rear portion 54.The variation of this direction constantly repeats in passing the overcurrent process of heat exchanger.

Because the caused medium commutation of the shape of flow channels forms many vortexs, forms very high heat exchange value thus.Also prolonged the time that medium keeps by turning in heat exchanger.

Fig. 5 represents a vertical view with sheet material of the flow channels that is snake shape line 60 shapes.Because the supporting surface of another sheet material is very big relatively, so this embodiment can be used for the very high occasion of pressure.

Fig. 6 represents two sheet materials with zigzag flow channels 70,71.The zigzag flow channels 70 usefulness solid lines of last sheet material represent that the flow channels 71 of following sheet material dots.Medium can enter next plane from a plane in 72 places in the crosspoint, produces spiral flow thus.Be used to produce the method for plate material for heat exchanger, wherein sheet material comprises the hollow space of the moulding that is used for the air flow channels.Sheet material is made by plastics, the especially sheet plastic deep drawn under air pressure of heating.The hollow space of sheet material constitutes flow channels, and flow channels has an Offset portion to the small part skew on its longitudinal length.In the time of mutual stacked sheet material, described Offset portion is supporting a position thereon or the sheet material under it in the edge of a flow channels.

Claims

1. be used to produce the method for the sheet material of a heat exchanger, wherein, the moulding by sheet material makes it have the hollow space that is used for the fluid overcurrent, and sheet material is by plastics, and especially the sheet plastic deep drawn is made, and carries out deep drawn under pressure.

2. the method for claim 1 is characterized in that, plastics or sheet plastic are than the original material 80%-300% that extends in the deep drawn process.

3. method as claimed in claim 1 or 2 is characterized in that, with non-flammable polypropylene as plastics or sheet plastic.

4. as the described method of claim 1 to 3, it is characterized in that sheet material is located to be connected airtightly mutually with lateral edges (2) in distolateral edge (1).

5. method as claimed in claim 4 is characterized in that, by bonding, extruding, thermal weld, pulse welding, ultrasonic wave or Vibration Welding sheet material is interconnected.

6. as the described method of claim 1 to 5, it is characterized in that, hollow space constitutes flow channels, has the laterally offset part that at least one segmented constitutes on the whole axial direction of flow channels, when sheet material was mutually stacked, this laterally offset part was supporting the position thereon or be positioned at sheet material under it in the edge of flow channels.

7. method as claimed in claim 6 is characterized in that, flow channels is in level or vertical plane cathetus shape, zigzag, shaped form or snakelike extension.

8. as claim 6 or 7 described methods, it is characterized in that flow channels is intersected stacked mutually.