WO2019073807A1 - Metal base plate material for use in heat exchange plate - Google Patents

Abstract

A metal base plate material for use in a heat exchange plate built into a plate-type heat exchanger, wherein the surface of the base plate material is provided with a plurality of strip-shaped first regions and a plurality of strip-shaped second regions, which are provided alternately and in parallel, the strips-shaped first regions have a plurality of first protrusions arranged substantially parallel to each other and at substantially equal intervals such that an angle of intersection with the longitudinal direction is between 10 and 25 degrees, the strip-shaped second regions have a plurality of second protrusions arranged substantially parallel to each other and at substantially equal intervals, at an angle allowing the plurality of second protrusions to face the plurality of first protrusions in the transverse direction, the first regions and the second regions are separated from each other at substantially equal intervals with a gap region therebetween, and when one direction in the longitudinal direction of the first regions and the second regions is defined as the downstream direction a first end on the downstream side of the plurality of first protrusions and a second end on the downstream side of the plurality of second protrusions are offset from each other in the longitudinal direction.

Description

Metal original plate material used for heat exchange plate

The present invention relates to a metal base plate used for a heat exchange plate.

Plate type heat exchangers are known which make use of the condensation heat transfer of the working medium. The heat exchange plate contained in the plate type heat exchanger is usually formed into a complex shape such as a herringbone shape for the purpose of improving heat exchange efficiency and mechanical durability. Such a heat exchange plate is generally manufactured by pressing a metal original plate material.

In order to further improve the heat exchange efficiency of the heat exchange plate, a method has been proposed in which a plurality of fine projections are provided on the surface of a metal original plate material before pressing (Patent Document 1). In the base plate material of Patent Document 1, two types of protrusions are formed symmetrically on the surface of a metal flat material before pressing at an angle to form a V shape, and a gap between these two types of protrusions It is said that the stirring action on the vapor of the working medium promotes condensation of the working medium, and the condensate of the working medium can be efficiently discharged.

The two types of protrusions provided on the surface of the original plate material of Patent Document 1 have a symmetrical V shape having a gap between the protrusions, so the condensate flowing down the surface of the original plate has two types of protrusions It is concentrated between the ridges by the guidance of the ridges, and decelerates when passing through the gap between the downstream ends of the ridges. For this reason, in order to disperse | distribute a condensate appropriately on the plate | board material surface, and to discharge | emit a condensate more efficiently, a new idea is required.

JP, 2015-161449, A

The present invention has been made based on the above circumstances, and provides a metal base plate used for a heat exchange plate capable of appropriately dispersing the condensate of the working medium and efficiently discharging the condensate. The purpose is

The invention made in order to solve the above-mentioned subject is metal former board material used for a heat exchange plate built in a plate type heat exchanger, and at least one surface is a plurality of beltlike 1st fields and a plurality of A plurality of strip-shaped second regions arranged in parallel and alternately, the plurality of strip-like first regions being arranged substantially parallel and at substantially equal intervals such that the crossing angle with the longitudinal direction is 10 degrees or more and 25 degrees or less The strip-like second region has a plurality of ridges and a plurality of second ridges aligned substantially parallel and at substantially equal intervals at an angle facing the plurality of first ridges in the short direction; When the first area and the second area are spaced at substantially equal intervals via the gap area, and one of the first area and the second area in the longitudinal direction is the downstream direction, the plurality of first areas and the second area are separated. The downstream first end of the ridge and the downstream second end of the plurality of second ridges are in the longitudinal direction They are offset from each other.

The metal original plate material has a gap area between the first area and the second area, and the end portions of the two types of ridges are disposed to be shifted in the longitudinal direction of the first area and the second area. Therefore, the concentration of the condensate between the ends of the two types of ridges can be suppressed, and the condensate can be properly dispersed. In addition, the metal base plate material has two types of ridges inclined in opposite directions with respect to the longitudinal direction so that the crossing angle with the longitudinal direction of the first region and the second region is 10 degrees or more and 25 degrees or less. Since it arrange | positions, a condensate can be discharged | emitted efficiently by suppressing the deceleration of the condensate which flows down.

The average distance between the plurality of first protrusions is 0.1 mm or more and 1.0 mm or less, the average distance between the plurality of second protrusions is 0.1 mm or more and 1.0 mm or less, and the first region The average distance between the second regions may be 0.2 mm or more and 4.0 mm or less. As a result, since the average distance between the first protrusions, the average distance between the second protrusions, and the average distance between the first region and the second region are appropriately adjusted, the metal base plate material concerned can It can be discharged efficiently.

The amount of longitudinal displacement between the first end and the second end may be 0.1 mm or more and 5.8 mm or less. As a result, the metallic base plate can appropriately disperse the condensate because the amount of longitudinal displacement between the first end and the second end is appropriately adjusted.

The angle of intersection of the second ridge with the longitudinal direction of the second region is preferably equal to the angle of intersection of the first ridge. This is because the balance of the flow rate of the condensate in the first area and the second area can be effectively balanced.

The metal base plate used for the heat exchange plate of the present invention can properly disperse the condensate of the working medium and can efficiently discharge the condensate.

It is a schematic plan view which shows partially the surface of the metal base material board | plate of one Embodiment of this invention. FIG. 2 is a schematic perspective cross-sectional view partially showing an AA cross section in the vicinity of the surface of the metal base plate material of FIG. 1;

Hereinafter, an embodiment of a metal original plate material used for a heat exchange plate according to the present invention will be described in detail with reference to the drawings.

[Metal original plate material]
The metal original plate material 1 of FIG. 1 is a metal original plate material used for a heat exchange plate incorporated in a plate type heat exchanger. The material of the metal base plate 1 is not particularly limited, and titanium, for example, is used. The metal original plate material 1 is a flat plate material which is a raw material for manufacturing a heat exchange plate, and when incorporated in a plate type heat exchanger, is formed into a heat exchange plate by press processing. The metal base plate 1 is not particularly limited, but a rectangular plate having a long side of 1200 mm, a short side of 800 mm, and an average thickness of 0.5 mm to 1.0 mm is used.

A plurality of band-like first regions 2 and a plurality of band-like second regions 3 are provided in parallel and alternately on the surface of the metal base plate 1. The surface provided with the first region 2 and the second region 3 may be at least one surface of the metal base plate 1, and even if it is only one side of the metal base plate 1, the surface of the metal base plate 1 It may be both sides.

<First area>
The first area 2 is a band-like area provided on the surface of the metal base plate 1 and a plurality of first areas 2 are provided substantially in parallel. Each of the first regions 2 has a plurality of first ridges 21 aligned substantially in parallel and at substantially equal intervals such that the angle of intersection with the longitudinal direction is θ1.

As a minimum of average width Z1 of the cross direction of the 1st field 2, 1 mm is preferred, 2 mm is more preferred, and 3 mm is still more preferred. On the other hand, as an upper limit of average width Z1, 20 mm is preferred, 18 mm is more preferred, and 16 mm is more preferred. If the average width Z1 is less than the above lower limit, the stirring action on the vapor of the working medium may not be sufficiently obtained, and condensation of the working medium may not be promoted. Conversely, when the average width Z1 exceeds the upper limit, the condensate may stay in the first region 2 and the condensate may not be discharged efficiently. In addition, "average width" shows the value which averaged the width | variety of arbitrary five points in one object.

(1st protrusion)
In the first region 2, a plurality of first protrusions 21 are provided substantially in parallel and at substantially equal intervals. The first protrusion 21 is an elongated rod-like protrusion in a plan view, and both ends thereof have lengths reaching both side portions of the band-shaped first region 2. In addition, in FIG. 1, although the shape of the 1st protrusion 21 is substantially rectangular, two long sides should just be formed substantially parallel in planar view, and the 1st protrusion 21 is for example It may be curvilinear. The method of forming the ridges on the surface of the metal base plate 1 is not particularly limited, but, for example, a method of transferring unevenness during rolling is adopted.

An intersection angle θ1 between the first protrusion 21 and the longitudinal direction of the first region 2 is set to an acute angle in order to suppress the deceleration of the flowing down condensate. The lower limit of the intersection angle θ1 is preferably 10 degrees, more preferably 12 degrees, and even more preferably 13 degrees. On the other hand, the upper limit of the intersection angle θ1 is preferably 25 degrees, more preferably 22 degrees, and still more preferably 20 degrees. If the crossing angle θ1 is less than the above lower limit, the condensate may not be properly induced along the side of the first protrusion 21. Conversely, when the crossing angle θ1 exceeds the upper limit, the condensate may stay in the first region 2 and may not be discharged efficiently. The term "cross angle" refers to an acute angle out of two corners formed when two straight lines intersect.

As a minimum of average width a1 of a transverse direction of the 1st projected rim 21, 0.10 mm is preferred, 0.11 mm is more preferred, and 0.12 mm is still more preferred. On the other hand, the upper limit of the average width a1 is preferably 1.0 mm, more preferably 0.8 mm, and still more preferably 0.6 mm. If the average width a1 is less than the above lower limit, the strength of the first protrusion 21 may be insufficient. In contrast, when the average width a1 exceeds the upper limit, the condensate may flow down the upper surface of the first ridge 21 and the condensate may not be appropriately induced along the side of the first ridge 21.

The lower limit of the average distance b1 between the two first protrusions 21 is preferably 0.1 mm, more preferably 0.2 mm, and still more preferably 0.3 mm. On the other hand, the upper limit of the average distance b1 is preferably 1.0 mm, more preferably 0.9 mm, and still more preferably 0.8 mm. If the average distance b1 is less than the above lower limit, the condensate may overflow to the upper surface of the first ridge 21 and the condensate may not be properly induced along the side of the first ridge 21. Conversely, when the average distance b1 exceeds the upper limit, the condensate may stay between the first protrusions 21 and may not be discharged efficiently. In addition, "average distance" is the average of the distance in the short side direction of a protrusion, and shows the value which averaged five arbitrary distances between two protrusions.

As a minimum of average height h of the 1st projected rim 21 to the surface of metal former board material 1, 0.02 mm is preferred, 0.03 mm is more preferred, and 0.04 mm is still more preferred. On the other hand, the upper limit of the average height h is preferably 0.10 mm, more preferably 0.09 mm, and still more preferably 0.08 mm. If the average height h is less than the above lower limit, the stirring action on the vapor of the working medium may not be sufficiently obtained, and condensation of the working medium may not be promoted. Conversely, if the average height h exceeds the above upper limit, there is a possibility that the processing cost may increase.

<Second area>
Similar to the first area 2, the second area 3 is a band-like area provided on the surface of the metal base plate 1, and a plurality of second areas 3 are provided substantially in parallel. Each second region 3 includes a plurality of second protrusions 31 aligned substantially in parallel and at substantially equal intervals at an angle θ2 opposed to the plurality of first protrusions 21 in the short direction.

The lower limit of the average width Z2 in the short direction of the second region 3 is preferably 1 mm, more preferably 2 mm, and still more preferably 3 mm. On the other hand, as an upper limit of average width Z2, 20 mm is preferred, 18 mm is more preferred, and 16 mm is still more preferred. If the average width Z2 is less than the above lower limit, the action of stirring the vapor of the working medium may not be sufficiently obtained, and condensation of the working medium may not be promoted. Conversely, when the average width Z2 exceeds the upper limit, the condensate may stay in the second region 3 and the condensate may not be discharged efficiently.

(Second protrusion)
In the second region 3, a plurality of second protrusions 31 are provided substantially in parallel and at substantially equal intervals. Similar to the first protrusion 21, the second protrusion 31 is an elongated rod-like protrusion in plan view, and both ends thereof have lengths reaching both sides of the strip-shaped second region 3. In addition, in FIG. 1, although the shape of the 2nd protrusion 31 is substantially the same rectangle as the shape of the 1st protrusion 21, the 2nd protrusion 31 is planar view in the same manner as the 1st protrusion 21. The two long sides may be formed substantially in parallel. Further, from the viewpoint of balance of the amount of flow of the condensate, the second ridge 31 has the same shape as the first ridge 21 in plan view, and the height of the second ridge 31 with respect to the surface of the metal base plate 1 Is preferably equal to the height h of the first protrusion 21 with respect to the surface of the metal base plate 1 as shown in FIG.

Since the second ridges 31 are disposed at an angle facing the first ridges 21 in the short side direction, when one of the first region 2 and the second region 3 in the longitudinal direction is the downstream direction, The first end 21a on the downstream side of the first protrusion 21 and the second end 31a on the downstream side of the plurality of second protrusions 31 are close to each other with the gap region 4 interposed therebetween.

An intersection angle θ2 between the second ridges 31 and the longitudinal direction of the second region 3 is set to an acute angle in order to suppress the deceleration of the flowing down condensate. The lower limit of the intersection angle θ2 is preferably 10 degrees, more preferably 12 degrees, and still more preferably 13 degrees. On the other hand, the upper limit of the intersection angle θ2 is preferably 25 degrees, more preferably 22 degrees, and still more preferably 20 degrees. If the crossing angle θ2 is less than the above lower limit, the condensate may not be properly induced along the side of the second protrusion 31. Conversely, when the crossing angle θ2 exceeds the upper limit, the condensate may stay in the second region 3 and may not be discharged efficiently. From the viewpoint of balance of the flow rate of the condensate, it is preferable that the absolute values of the intersection angle θ1 and the intersection angle θ2 be equal.

As a minimum of average width a2 of a transverse direction of the 2nd projected rim 31, 0.10 mm is preferred, 0.11 mm is more preferred, and 0.12 mm is still more preferred. On the other hand, the upper limit of the average width a2 is preferably 1.0 mm, more preferably 0.8 mm, and still more preferably 0.6 mm. If the average width a2 is less than the above lower limit, the strength of the second protrusion 31 may be insufficient. Conversely, when the average width a2 exceeds the upper limit, the condensate may flow down the upper surface of the second ridge 31 and the condensate may not be properly induced along the side of the second ridge 31. The average width a1 and the average width a2 are preferably equal from the viewpoint of the balance of the flow rate of the condensate.

The lower limit of the average distance b2 between the two second protrusions 31 is preferably 0.1 mm, more preferably 0.2 mm, and still more preferably 0.3 mm. On the other hand, as an upper limit of average distance b2, 1.0 mm is preferred, 0.9 mm is more preferred, and 0.8 mm is still more preferred. If the average distance b2 is less than the above lower limit, the condensate may overflow on the upper surface of the second ridge 31 and the condensate may not be properly induced along the side of the second ridge 31. Conversely, if the average distance b2 exceeds the upper limit, the condensate may stay between the second protrusions 31 and may not be discharged efficiently. The average distance b1 and the average distance b2 are preferably equal from the viewpoint of the balance of the flow rate of the condensate.

When one of the first region 2 and the second region 3 in the longitudinal direction is taken as the downstream direction, as shown in FIG. 1, downstream first end portions 21 a of the plurality of first protrusions 21 and a plurality of second protrusions The downstream second ends 31 a of the strips 31 are offset from each other in the longitudinal direction. As the amount of deviation in the longitudinal direction between the first end 21a and the second end 31a, the amount of deviation W1 when the first end 21a is on the downstream side of the second end 31a, and the first end 21a The amount of deviation W2 in the upstream side of the second end 31a is present. The shift amount W1 and the shift amount W2 are preferably equal from the viewpoint of the balance of the flow-down amount of the condensate, but are not particularly limited, and the shift amount W1 and the shift amount W2 may be different. The downstream end of the ridge refers to the downstream end of the upstream long side of the ridge.

The lower limit of the longitudinal displacement amount W1 between the first end 21a and the second end 31a is preferably 0.1 mm, more preferably 0.6 mm, and still more preferably 1.0 mm. On the other hand, as an upper limit of average distance b2, 5.8 mm is preferred, 4.5 mm is more preferred, and 3.5 mm is still more preferred. If the deviation amount W1 is less than the above lower limit, concentration of the condensate between the first end 21a and the second end 31a is not suppressed, and the condensate may not be properly dispersed. Conversely, if the displacement amount W1 exceeds the upper limit, there is a possibility that the condensate may not be properly induced along the first and second protrusions 21 and 31. The lower limit and the upper limit of the deviation amount W2 are the same as W1.

<Near gap area>
The first area 2 and the second area 3 are spaced at substantially equal intervals via the gap area 4. The gap region 4 is a band-like region parallel to the longitudinal direction of the first region 2 and the second region 3, and the first region 2 and the second region 3 are disposed in parallel across the gap region 4. . No unevenness such as a ridge is formed in the clearance area 4 and most of the condensate flows down the clearance area 4 while meandering.

As a minimum of average distance X between the 1st field 2 and the 2nd field 3, 0.2 mm is preferred, 0.3 mm is more preferred, and 0.4 mm is still more preferred. On the other hand, the upper limit of the average distance X is preferably 4.0 mm, more preferably 3.5 mm, and still more preferably 3.0 mm. If the average distance X is less than the above lower limit, the condensate may not be discharged efficiently. Conversely, if the average distance X exceeds the upper limit, the condensate may not be properly induced along the first and second protrusions 21 and 31.

(advantage)
The metal original plate material 1 has a gap area 4 between the first area 2 and the second area 3, and the ends of the two types of ridges are shifted in the longitudinal direction of the first area 2 and the second area 3. Since it arranges, it is possible to suppress the concentration of the condensate between the ends of the two types of ridges and to disperse the condensate appropriately. Further, since the metal base plate 1 is provided with two types of ridges so that the crossing angle with the longitudinal direction of the first area 2 and the second area 3 is 10 degrees or more and 25 degrees or less, It is possible to discharge the condensate efficiently by suppressing the deceleration of the condensate.

Further, in the metal original plate material 1, the average distance b 1 between the first protrusions 21, the average distance b 2 between the second protrusions 31, and the average distance X between the first region 2 and the second region 3 are properly adjusted. As a result, the condensate can be discharged efficiently.

In addition, since the displacement amounts W1 and W2 in the longitudinal direction between the first end 21a and the second end 31a are appropriately adjusted, the metal original plate material 1 can appropriately disperse the condensate.

Other Embodiments
The metal original plate material used for the heat exchange plate of the present invention is not limited to the above embodiment.

Although the metal original board material 1 demonstrated the thing provided with the clearance area | region 4 between the 1st area | region 2 and the 2nd area | region 3 in the said embodiment, the clearance area 4 has the 1st end 21a and the 2nd end It may be provided between the portions 31 a, and may not be provided between the upstream end of the first protrusion 21 and the upstream end of the second protrusion 31.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

As a performance test of condensation heat transfer, No. 1 to No. The heat transfer rate was evaluated using the metal original plate material of 4. Hydrofluorocarbon (R134a) was used as the working medium to be brought into contact with the surface of the metal base plate, and cold water was used as the refrigerant to be brought into contact with the back of the metal base plate to condense the working medium. The working medium was made to flow into the surface of the metal base plate material at a pressure of 0.68 MPa and a flow rate of 30 ° C. using a heater. Cold water was made to flow into the back surface of the metal base plate at an inflow temperature of 20 ° C. and a flow rate of 3 L / min. Further, the heat transfer area of the metal original plate and 17500Mm ^2, and the W depth and 2 mm. The heat passing rate is the inflow temperature of cold water to the back surface of the metal base plate, the outflow temperature of cold water from the back surface of the metal base plate, the heat transfer area of the metal base plate, the inflow temperature of the working medium and the cold water The difference was calculated using the difference of the inflow temperature of

The surface of the metal base plate to be brought into contact with the working medium was as follows. No. 1 to No. The metal base plate 2 of No. 2 is the metal base plate 1 of the above-described embodiment. In the metal base plate 3 of the third embodiment, with respect to the metal base plate 1 of the above-described embodiment, the crossing angle θ between the ridges and the longitudinal direction of the region where the ridges are provided and the longitudinal shift amount W between the ends of the ridges Out of the scope of the embodiment. Also, no. The metal base plate of No. 4 is a flat plate material having no ridges on the surface. No. 1 to No. The third metal base plate has the same shape as the first protrusion and the second protrusion.

[No. 1 metal former board material]
Height h of the ridge: 0.05 mm, width a of the ridge in the lateral direction a: 0.125 mm, distance between the ridges b: 0.6 mm, the ridge and the longitudinal direction of the region where the ridge is provided Crossing angle θ: 15 degrees, distance X between the areas where the ridges are provided X: 0.98 mm, width Z in the width direction of the areas where the ridges are provided Z: 4.88 mm, longitudinal deviation between the ends of the ridges Amount W: 1.4 mm
[No. Metal original plate material of 2]
Height h of the ridge: 0.05 mm, width a of the ridge in the lateral direction a: 0.125 mm, distance between the ridges b: 0.6 mm, the ridge and the longitudinal direction of the region where the ridge is provided Crossing angle θ: 15 degrees, distance X between the areas in which the ridges are provided X: 0.49 mm, width Z in the width direction of the area in which the ridges are provided Z: 2.44 mm, longitudinal deviation between the ends of the ridges Amount W: 1.4 mm
[No. 3 metal former board material]
Height h of the ridge: 0.05 mm, width a of the ridge in the lateral direction a: 0.125 mm, distance between the ridges b: 0.6 mm, the ridge and the longitudinal direction of the region where the ridge is provided Crossing angle θ: 45 degrees, distance X between the areas in which the ridges are provided X: 4 mm, width Z in the width direction of the area in which the ridges are provided Z: 20 mm, longitudinal displacement between the ends of the ridges W: 0 mm

As a result of the test, No. The heat transfer rate of the metal original plate material of No. 1 is 3592 W / m ² · K, no. The heat transfer rate of the metal base plate of No. ² is 3436 W / m ² · K, no. The heat transfer rate of the metal base plate of No. 3 is 2518 W / m ² · K, no. The heat transfer rate of the metal original plate material of No. 4 is 2305 W / m ² · K. 1 to No. It was confirmed that the metal original board material of 2 showed a high heat transfer rate. Thereby, No. 1 to No. It can be said that the heat passing rate of the metal original plate material is improved when the ridges are provided in an appropriate arrangement on the surface of the metal original plate material as in the metal original plate material of 2.

The metal base plate used for the heat exchange plate of the present invention can properly disperse the condensate of the working medium and can efficiently discharge the condensate.

DESCRIPTION OF SYMBOLS 1 metal original board material 2 1st area | region 3 2nd area | region 4 clearance area 21 1st protrusion 21a 1st end part 31 2nd protrusion 31a 2nd end

Claims (4)

A metal original plate material used for a heat exchange plate incorporated in a plate type heat exchanger,
At least one surface is
A plurality of strip-shaped first regions and a plurality of strip-shaped second regions arranged in parallel and alternately;
The band-shaped first region is
It has a plurality of first ridges arranged substantially parallel and at substantially equal intervals so that the crossing angle with the longitudinal direction is 10 degrees or more and 25 degrees or less,
The band-shaped second region is
It has a plurality of second protrusions arranged substantially parallel and at substantially equal intervals at an angle facing the plurality of first protrusions in the short direction,
The first area and the second area are spaced at substantially equal intervals via a gap area,
When one of the first region and the second region in the longitudinal direction is taken as the downstream direction, the downstream first ends of the plurality of first protrusions and the second of the plurality of second protrusions downstream of the plurality of second protrusions Metal original plate material which is mutually shifted in the longitudinal direction with the end. The average distance between the plurality of first protrusions is 0.1 mm or more and 1.0 mm or less,
The average distance between the plurality of second protrusions is 0.1 mm or more and 1.0 mm or less,
The metal original board material according to claim 1 whose average distance between said 1st field and said 2nd field is 0.2 mm or more and 4.0 mm or less. The metal original board material according to claim 1 or 2, wherein the shift amount in the longitudinal direction between the first end and the second end is 0.1 mm or more and 5.8 mm or less. The metal original plate material according to claim 1, wherein an angle of intersection of the second protrusion with the longitudinal direction of the second region is equal to an absolute value of an angle of intersection of the first protrusion.

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