CN111108338A

CN111108338A - Metal base plate for heat exchanger plate

Info

Publication number: CN111108338A
Application number: CN201880061319.1A
Authority: CN
Inventors: 田村圭太郎; 逸见义男; 福谷和久; 冈本明夫
Original assignee: Kobe Steel Ltd
Current assignee: Kobe Steel Ltd
Priority date: 2017-10-12
Filing date: 2018-09-27
Publication date: 2020-05-05
Anticipated expiration: 2038-09-27
Also published as: EP3696487A1; JP2019074226A; KR102407924B1; US20200248975A1; CN111108338B; RU2747945C1; JP6815965B2; EP3696487A4; KR20200062313A; WO2019073807A1

Abstract

The invention relates to a metal base plate for a heat exchanger plate to be built in a plate heat exchanger, wherein, the surface of the first band-shaped region is provided with a plurality of first strip-shaped regions and a plurality of second band-shaped regions in parallel and alternately, the first band-shaped regions have a plurality of first protrusions arranged substantially in parallel and substantially at equal intervals at an angle of 10 degrees or more and 25 degrees or less with respect to the longitudinal direction, the second band-shaped regions have a plurality of second protrusions arranged substantially in parallel and substantially at equal intervals at an angle facing the first protrusions in the lateral direction, the first region and the second region are substantially equally spaced apart from each other with a gap region therebetween, when one of the first region and the second region is set to a downstream direction, downstream-side first ends of the first protrusions and downstream-side second ends of the second protrusions are offset from each other in the longitudinal direction.

Description

Metal base plate for heat exchanger plate

Technical Field

The present invention relates to a metal base sheet for heat exchanger plates.

Background

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

In order to further improve the heat exchange efficiency of the heat exchange plate, a method of providing a plurality of fine projections on the surface of a metal base plate material before press working has been proposed (patent document 1). In the base plate material of patent document 1, two types of projections are symmetrically formed at an angle in a V shape on the surface of a metal flat plate material before press working, and a gap is provided between the two types of projections, whereby the condensation of the working medium is promoted by the stirring action of the steam with respect to the working medium, and the condensed liquid of the working medium can be efficiently discharged.

Since the two kinds of ridges provided on the surface of the base plate material of patent document 1 have a symmetrical V-shape with a gap between the ridges, the condensed liquid flowing down the surface of the base plate material is guided by the two kinds of ridges to be concentrated between the ridges, and is decelerated when passing through the gap between the downstream ends of the ridges. Therefore, new measures are required to properly disperse the condensate on the surface of the plate material and to more efficiently discharge the condensate.

[ Prior Art document ]

[ patent document ]

[ patent document 1 ] Japanese patent laid-open No. 2015-161449

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a metal base plate material for a heat exchange plate, which can appropriately disperse a condensate of a working medium and efficiently discharge the condensate.

In order to solve the above-described problems, the present invention is a metal base plate material used for a heat exchange plate incorporated in a plate heat exchanger, the metal base plate material including a plurality of strip-shaped first regions and a plurality of strip-shaped second regions arranged in parallel and alternately on at least one surface, the strip-shaped first regions including a plurality of first ribs arranged substantially in parallel and substantially at equal intervals such that an angle intersecting a longitudinal direction is 10 degrees or more and 25 degrees or less, the strip-shaped second regions including a plurality of second ribs arranged substantially in parallel and substantially at equal intervals such that an angle opposing the plurality of first ribs in a lateral width direction is substantially equal to an angle opposing the plurality of second ribs, the first regions and the second regions being separated substantially at equal intervals by a gap region, and when one of the first regions and the second regions in the longitudinal direction is a downstream direction, first end portions on a downstream side of the plurality of first ribs and second end portions on a downstream side of the plurality of second ribs are separated substantially at equal intervals in the longitudinal direction Are offset from each other.

In the metal base plate material, the gap region is provided between the first region and the second region, and the end portions of the two types of protrusions are arranged so as to be offset in the longitudinal direction of the first region and the second region, so that the concentration of the coagulation liquid between the end portions of the two types of protrusions can be suppressed, and the coagulation liquid can be appropriately dispersed. In addition, in the metal base plate material, since the two kinds of projections inclined in opposite directions to each other are arranged in the longitudinal direction so that the angle of intersection between the first region and the second region and the longitudinal direction is 10 degrees or more and 25 degrees or less, the condensed fluid can be efficiently discharged by suppressing the deceleration of the condensed fluid flowing down.

The average distance between the first protrusions is preferably 0.1mm or more and 1.0mm or less, the average distance between the second protrusions is preferably 0.1mm or more and 1.0mm or less, and the average distance between the first region and the second region is preferably 0.2mm or more and 4.0mm or less. Accordingly, in the metal base plate material, 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 condensed liquid can be efficiently discharged.

The amount of displacement in the longitudinal direction between the first end and the second end is preferably 0.1mm or more and 5.8mm or less. Thus, the amount of displacement in the longitudinal direction between the first end and the second end of the metal base plate material is appropriately adjusted, and therefore the coagulation liquid can be appropriately dispersed.

The intersection angle of the second ridge with the longitudinal direction of the second region is preferably equal in absolute value to the intersection angle of the first ridge. This is because the amounts of the condensed liquid flowing down in the first region and the second region can be effectively equalized.

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

Drawings

Fig. 1 is a schematic plan view partially showing a surface of a metal base plate material according to an embodiment of the present invention.

Fig. 2 is a schematic perspective sectional view partially showing a section a-a near the surface of the metal base plate material in fig. 1.

Detailed Description

Hereinafter, embodiments of a metal base plate material used for the heat exchanger plate of the present invention will be described in detail with reference to the drawings.

[ Metal base plate ]

The metal base plate 1 of fig. 1 is a metal base plate used for a heat exchange plate incorporated in a plate heat exchanger. The material of the metal base plate material 1 is not particularly limited, and titanium, for example, can be used. The metal base plate material 1 is a flat plate material as a raw material for manufacturing a heat exchange plate, and is formed into a heat exchange plate by press working when incorporated in a plate heat exchanger. The metal base plate material 1 is not particularly limited, and a rectangular plate having a long side of 1200mm, a short side of 800mm, and an average thickness of 0.5mm or more and 1.0mm or less can be used.

A plurality of strip-shaped first regions 2 and a plurality of strip-shaped second regions 3 are alternately arranged in parallel on the surface of the metal base plate material 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 material 1, and may be only one surface of the metal base plate material 1 or both surfaces of the metal base plate material 1.

< first region >

The first region 2 is a band-shaped region provided on the surface of the metal base plate material 1, and the plurality of first regions 2 are provided substantially in parallel. Each of the first regions 2 has a plurality of first protrusions 21 arranged substantially in parallel and substantially at equal intervals so that an intersection angle with the longitudinal direction is θ 1.

The lower limit of the average width Z1 in the transverse width direction of the first region 2 is preferably 1mm, more preferably 2mm, and still more preferably 3 mm. On the other hand, the upper limit of the average width Z1 is preferably 20mm, more preferably 18mm, and still more preferably 16 mm. If the average width Z1 is less than the lower limit, the stirring action for the vapor of the working medium may not be sufficiently obtained, and the condensation of the working medium may not be promoted. On the other hand, if the average width Z1 is higher than the upper limit, the condensed liquid may be retained in the first region 2, and the condensed liquid may not be efficiently discharged. The "average width" means a value obtained by averaging the widths of arbitrary 5 points of 1 object.

(first projection)

In the first region 2, a plurality of first protrusions 21 are provided substantially in parallel and substantially at equal intervals. The first ridge 21 is a long, rod-shaped ridge in plan view, and has a length such that both ends thereof touch both side portions of the band-shaped first region 2. In fig. 1, the first ridge 21 has a substantially rectangular shape, but the first ridge 21 may be formed so that 2 long sides are substantially parallel in a plan view, and both ends may have a curved shape, for example. The method of forming the ridges on the surface of the metal base plate material 1 is not particularly limited, and for example, a method of transferring irregularities during rolling or the like may be used.

The angle θ 1 of intersection of the first ridge 21 and the first region 2 in the longitudinal direction is set to an acute angle in order to suppress deceleration of the flowing condensate. The lower limit of the intersection angle θ 1 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 θ 1 is preferably 25 degrees, more preferably 22 degrees, and still more preferably 20 degrees. If the intersection angle θ 1 is lower than the lower limit, the condensate may not be properly guided along the side of the first ridge 21. On the other hand, if the intersection angle θ 1 is higher than the upper limit, the condensed liquid may be retained in the first region 2 and cannot be efficiently discharged. The "intersection angle" means an acute angle among 2 angles formed when 2 straight lines intersect each other.

The lower limit of the average width a1 in the lateral width direction of the first ridges 21 is preferably 0.10mm, more preferably 0.11mm, and still more preferably 0.12 mm. On the other hand, the upper limit of the average width a1 is preferably 1.0mm, more preferably 0.8mm, and still more preferably 0.6 mm. If the average width a1 is less than the lower limit, the strength of the first ridges 21 may be insufficient. On the other hand, if the average width a1 is higher than the upper limit, the condensate may flow down the upper surface of the first ridge 21 and may not be properly guided along the side edges of the first ridge 21.

The lower limit of the average distance b1 between the 2 first ridges 21 is preferably 0.1mm, more preferably 0.2mm, and still more preferably 0.3 mm. On the other hand, the upper limit of the average distance b1 is preferably 1.0mm, more preferably 0.9mm, and still more preferably 0.8 mm. If the average distance b1 is less than the lower limit, the condensate may overflow the upper surface of the first ridge 21 and may not be properly guided along the side edge of the first ridge 21. On the other hand, if the average distance b1 is greater than the upper limit, the condensate may be retained between the first ribs 21 and may not be efficiently discharged. The "average distance" is an average of distances in the lateral direction of the ridges, and represents a value obtained by averaging 5 arbitrary distances between 2 ridges.

The lower limit of the average height h of the first ridges 21 relative to the surface of the metal base plate material 1 is preferably 0.02mm, more preferably 0.03mm, and still more preferably 0.04 mm. On the other hand, the upper limit of the average height h is preferably 0.10mm, more preferably 0.09mm, and still more preferably 0.08 mm. If the average height h is less than the lower limit, the stirring action of the vapor of the working medium may not be sufficiently obtained, and the condensation of the working medium may not be promoted. Conversely, if the average height h is higher than the upper limit, the processing cost may increase.

< second region >

The second region 3 is a band-shaped region provided on the surface of the metal base plate material 1, similarly to the first region 2, and a plurality of the second regions 3 are provided substantially in parallel. Each second region 3 has a plurality of second protrusions 31 arranged substantially in parallel and substantially at equal intervals at an angle θ 2 in the lateral width direction with respect to the plurality of first protrusions 21.

The lower limit of the average width Z2 in the transverse width direction of the second region 3 is preferably 1mm, more preferably 2mm, and still more preferably 3 mm. On the other hand, the upper limit of the average width Z2 is preferably 20mm, more preferably 18mm, and still more preferably 16 mm. If the average width Z2 is less than the lower limit, the stirring action for the vapor of the working medium may not be sufficiently obtained, and the condensation of the working medium may not be promoted. On the other hand, if the average width Z2 is higher than the upper limit, the condensate may be retained in the second region 3 and the condensate may not be efficiently discharged.

(second projection)

In the second region 3, a plurality of second ribs 31 are arranged substantially in parallel and substantially at equal intervals. Like the first ribs 21, the second ribs 31 are elongated rod-shaped ribs in plan view, and have a length such that both ends thereof touch both side portions of the band-shaped second region 3. In fig. 1, the second ridge 31 has a substantially rectangular shape similar to the first ridge 21, but the second ridge 31 may be formed so that the long sides of the second ridge 2 are substantially parallel to each other in a plan view similar to the first ridge 21. From the viewpoint of balancing the amount of the condensate flowing down, the second ridges 31 preferably have the same shape as the first ridges 21 in plan view, and the height of the second ridges 31 relative to the surface of the metal base plate material 1 is preferably equal to the height h of the first ridges 21 relative to the surface of the metal base plate material 1 as shown in fig. 2.

Since the second ribs 31 are disposed at an angle facing the first ribs 21 in the lateral width direction, when one of the longitudinal directions of the first and second regions 2 and 3 is set to be a downstream direction, the downstream first ends 21a of the first ribs 21 and the downstream second ends 31a of the second ribs 31 are close to each other across the gap region 4.

The angle θ 2 of intersection of the second ridge 31 and the second region 3 in the longitudinal direction is set to an acute angle in order to suppress deceleration of the flowing condensate. The lower limit of the intersection angle θ 2 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 θ 2 is preferably 25 degrees, more preferably 22 degrees, and still more preferably 20 degrees. If the intersection angle θ 2 is lower than the lower limit, the condensate may not be appropriately guided along the side of the second ridge 31. Conversely, if the intersection angle θ 2 is higher than the upper limit, the condensate may be retained in the second region 3 and may not be efficiently discharged. In view of the balance of the amount of the condensate flowing down, the intersection angle θ 1 and the intersection angle θ 2 are preferably equal in absolute value.

The lower limit of the average width a2 in the lateral width direction of the second ridges 31 is preferably 0.10mm, more preferably 0.11mm, and still more preferably 0.12 mm. On the other hand, the upper limit of the average width a2 is preferably 1.0mm, more preferably 0.8mm, and still more preferably 0.6 mm. If the average width a2 is less than the lower limit, the strength of the second protrusions 31 may be insufficient. On the other hand, if the average width a2 is higher than the upper limit, the condensate may flow down the upper surface of the second ridge 31 and may not be properly guided along the side edges of the second ridge 31. From the viewpoint of the balance of the amount of the condensate flowing down, the average width a1 and the average width a2 are preferably equal to each other.

The lower limit of the average distance b2 between the 2 second ridges 31 is preferably 0.1mm, more preferably 0.2mm, and still more preferably 0.3 mm. On the other hand, the upper limit of the average distance b2 is preferably 1.0mm, more preferably 0.9mm, and still more preferably 0.8 mm. If the average distance b2 is less than the lower limit, the condensate may overflow the upper surface of the second ridge 31 and may not be properly guided along the side edges of the second ridge 31. On the other hand, if the average distance b2 is greater than the upper limit, the condensate may be retained between the second ribs 31 and may not be efficiently discharged. From the viewpoint of equalizing the amount of the condensate flowing down, the average distance b1 and the average distance b2 are preferably equal to each other.

When one of the longitudinal directions of the first region 2 and the second region 3 is set to be a downstream direction, as shown in fig. 1, the downstream first ends 21a of the first protrusions 21 and the downstream second ends 31a of the second protrusions 31 are offset from each other in the longitudinal direction. As the amount of displacement in the longitudinal direction between the first end 21a and the second end 31a, there are a displacement amount W1 when the first end 21a is located on the downstream side of the second end 31a, and a displacement amount W2 when the first end 21a is located on the upstream side of the second end 31 a. From the viewpoint of the balance of the amount of the condensate flowing down, the offset amount W1 and the offset amount W2 are preferably equal to each other, but are not particularly limited to these, and the offset amount W1 and the offset amount W2 may be different from each other. The end portion on the downstream side of the ridge means the end portion on the downstream side of the long side on the upstream side of the ridge.

The lower limit of the amount W1 of displacement in the longitudinal direction between the first end 21a and the second end 31a is preferably 0.1mm, more preferably 0.6mm, and still more preferably 1.0 mm. On the other hand, the upper limit of the average distance b2 is preferably 5.8mm, more preferably 4.5mm, and still more preferably 3.5 mm. If the offset amount W1 is less than the lower limit, the concentration of the condensate between the first end 21a and the second end 31a may not be suppressed, and the condensate may not be properly dispersed. On the other hand, if the offset amount W1 is higher than the upper limit, the condensate may not be appropriately guided along the first ridges 21 and the second ridges 31. The lower limit and the upper limit of the offset amount W2 are also the same as W1.

< gap region >

The first region 2 and the second region 3 are separated from each other at substantially equal intervals by a gap region 4. The gap region 4 is a band-shaped 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 arranged in parallel with each other with the gap region 4 interposed therebetween. In the gap region 4, the irregularities such as ridges are not formed, and most of the condensate flows down the gap region 4 while meandering.

The lower limit of the average distance X between the first region 2 and the second region 3 is preferably 0.2mm, more preferably 0.3mm, and still more preferably 0.4 mm. On the other hand, the upper limit of the average distance X is preferably 4.0mm, more preferably 3.5mm, and still more preferably 3.0 mm. If the average distance X is less than the lower limit, the condensate may not be efficiently discharged. On the other hand, if the average distance X is greater than the upper limit, the condensate may not be properly guided along the first ridges 21 and the second ridges 31.

(advantages)

In the metal base plate material 1, the gap region 4 is provided between the first region 2 and the second region 3, and the end portions of the two types of protrusions are arranged so as to be offset in the longitudinal direction of the first region 2 and the second region 3, so that the concentration of the coagulation liquid between the end portions of the two types of protrusions can be suppressed, and the coagulation liquid can be appropriately dispersed. In addition, since the metal base plate material 1 is provided with the two kinds of protrusions so that the intersection angle with the longitudinal direction of the first region 2 and the second region 3 is 10 degrees or more and 25 degrees or less, the deceleration of the flowing-down condensate can be suppressed, and the condensate can be efficiently discharged.

In addition, in the metal base plate material 1, since the average distance b1 between the first protrusions 21, the average distance b2 between the second protrusions 31, and the average distance X between the first region 2 and the second region 3 are appropriately adjusted, the condensate can be efficiently discharged.

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

[ other embodiments ]

The metal base plate used for the heat exchanger plate of the present invention is not limited to the above-described embodiments.

In the above embodiment, the case where the metal base plate material 1 includes the gap region 4 between the first region 2 and the second region 3 has been described, but the gap region 4 may be provided between the first end portion 21a and the second end portion 31a, or may not be provided between the upstream end portion of the first ridge 21 and the upstream end portion of the second ridge 31.

[ examples ] A method for producing a compound

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

As a performance test of the heat transfer by condensation, the heat transfer rate of the metal base plate materials using Nos. 1 to 4 was evaluated. As the working medium which contacts with the surface of the metal base plate material, hydrofluorocarbon (R134a) was used, and as the refrigerant which condenses the working medium and contacts with the back surface of the metal base plate material, cold water was used. The working medium was flowed into the surface of the metal base plate at a heater inflow temperature of 30 ℃ and a pressure of 0.68 MPa. The inflow temperature was set at 20 ℃ and the flow rate was set at 3L/min, so that cold water flowed into the back surface of the metal base plate. Further, the heat transfer area of the metal base plate was 17500mm²The depth W was set to 2 mm. The heat transfer rate was calculated using the difference between 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 inflow temperature of cold water.

The surface of the metal base plate material with which the working medium is brought into contact is as follows. The metal base plate materials of nos. 1 to 2 are the metal base plate materials 1 and 3 of the above embodiments, and in the metal base plate material 1 of the above embodiments, the intersection angle θ of the protrusion and the region where the protrusion is provided in the longitudinal direction and the offset W in the longitudinal direction between the ends of the protrusion are out of the range of the embodiments. The metal base plate material of No.4 was a flat plate material having no projected streaks on the surface. In the metal base plate materials of nos. 1 to 3, the first and second protrusions have the same shape.

[ No.1 Metal base plate ]

Height h of the ridge: 0.05mm, width a of the ridge in the lateral width direction: 0.125mm, distance between ridges b: 0.6mm, intersection angle θ of the ridge with the longitudinal direction of the region where the ridge is provided: 15 degrees, distance X between regions provided with protruding strips: 0.98mm, width Z in the lateral width direction of the region provided with the ridge: 4.88mm, amount of displacement W in the longitudinal direction between the ends of the ridge: 1.4mm

[ No.2 Metal base plate ]

Height h of the ridge: 0.05mm, width a of the ridge in the lateral width direction: 0.125mm, distance between ridges b: 0.6mm, intersection angle θ of the ridge with the longitudinal direction of the region where the ridge is provided: 15 degrees, distance X between regions provided with protruding strips: 0.49mm, width Z in the lateral width direction of the region provided with the ridge: 2.44mm, amount of displacement W in the longitudinal direction between the ends of the ridge: 1.4mm

[ No.3 Metal base plate ]

Height h of the ridge: 0.05mm, width a of the ridge in the lateral width direction: 0.125mm, distance between ridges b: 0.6mm, intersection angle θ of the ridge with the longitudinal direction of the region where the ridge is provided: 45 degrees, distance X between regions provided with ridges: 4mm, width Z in the lateral width direction of the region provided with the ridge: 20mm, amount of displacement W in the longitudinal direction between the ends of the ridge: 0mm

As a result of the test, it was confirmed that the heat transfer rate of the No.1 metal base plate material was 3592W/m²K, No.2 Metal base plate having a heat transfer rate of 3436W/m²K, No.3 Metal base plate Heat transfer Rate of 2518W/m²K, No.4 Metal base plate Heat transfer Rate 2305W/m²K, No.1 to No.2 show high heat transfer rate. Accordingly, it can be said that the heat transfer rate of the metal base plate material is improved if the ribs are provided on the surface of the metal base plate material in an appropriate arrangement, like the metal base plate materials of nos. 1 to 2.

Description of the symbols

1 Metal base plate

2 first region

3 second region

4 gap region

21 first projecting strip

21a first end part

31 second protrusion strip

31a second end portion

Claims

1. A base plate of metal for a heat exchanger plate to be built into a plate heat exchanger, wherein,

a plurality of strip-shaped first regions and a plurality of strip-shaped second regions are provided in parallel and alternately on at least one surface,

the first band-shaped region has a plurality of first protrusions arranged substantially in parallel and substantially at equal intervals so that an angle of intersection with a longitudinal direction is 10 degrees or more and 25 degrees or less,

the second region having a band shape has a plurality of second protrusions arranged substantially in parallel and substantially at equal intervals at an angle to the plurality of first protrusions in the lateral width direction,

the first region and the second region are substantially equally spaced apart from each other with a gap region therebetween,

when one of the first region and the second region in the longitudinal direction is set to be a downstream direction, first end portions on a downstream side of the first protrusions and second end portions on a downstream side of the second protrusions are offset from each other in the longitudinal direction.

2. The metal base plate according to claim 1,

the average distance between the first protruding strips is more than 0.1mm and less than 1.0mm,

the average distance between the second ribs is 0.1mm or more and 1.0mm or less,

the average distance between the first region and the second region is 0.2mm or more and 4.0mm or less.

3. The metal base plate material according to claim 1 or claim 2, wherein an offset amount in a longitudinal direction between the first end portion and the second end portion is 0.1mm or more and 5.8mm or less.

4. The metal base plate according to claim 1, wherein an intersection angle of the second ridge with the longitudinal direction of the second region is equal in absolute value to an intersection angle of the first ridge.