JP6815965B2 - Original metal plate used for heat exchange plates - Google Patents

Description

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

Plate heat exchangers that utilize the heat transfer of condensed heat in the working medium are known. The heat exchange plate built into this plate heat exchanger is usually formed into a complicated 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 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 ridges on the surface of the metal base plate material before press working has been proposed (Patent Document 1). In the original plate material of Patent Document 1, two types of ridges are symmetrically formed on the surface of a metal flat plate material before press working at an angle of V shape, and a gap is formed between these two types of ridges. By providing the above, the stirring action of the working medium with respect to the steam promotes the condensation of the working medium, and the condensate of the working medium can be efficiently discharged.

Since the two types of ridges provided on the surface of the original plate material of Patent Document 1 have a symmetrical V-shape with a gap between the ridges, the condensate flowing down the surface of the original plate material has two types of ridges. It concentrates between the ridges due to the guidance of the ridges and slows down when passing through the gap between the ends on the downstream side of the ridges. Therefore, a new device is required to appropriately disperse the condensate on the surface of the plate material and to discharge the condensate more efficiently.

JP-A-2015-161449

The present invention has been made based on the above circumstances, and provides a metal base plate material 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 to solve the above problems is a metal base plate material used for a heat exchange plate built in a plate heat exchanger, and at least one surface thereof is a plurality of strip-shaped first regions and a plurality of strips. A plurality of first regions in which the strip-shaped second regions are provided in parallel and alternately, and the strip-shaped first regions are arranged substantially in parallel and at substantially equal intervals so that the intersection angle with the longitudinal direction is 10 degrees or more and 25 degrees or less. The second region having a ridge and having a band shape has a plurality of second ridges arranged substantially parallel and at substantially equal intervals at an angle facing the plurality of first ridges in the lateral direction. When one region and the second region are separated at substantially equal intervals via a gap region, and one of the longitudinal direction of the first region and the second region is the downstream direction, the plurality of first regions The first end on the downstream side of the ridge and the second end on the downstream side of the plurality of second ridges are displaced from each other in the longitudinal direction.

The metal original plate material has a gap region between the first region and the second region, and the ends of the two types of ridges are arranged so as to be offset in the longitudinal direction of the first region and the second region. Therefore, the concentration of the condensate between the ends of the two types of ridges can be suppressed, and the condensate can be appropriately dispersed. Further, since the metal original plate material has two types of ridges arranged so that the angle of intersection with the longitudinal direction of the first region and the second region is 10 degrees or more and 25 degrees or less, the condensate flowing down. The condensate can be efficiently discharged by suppressing the deceleration of the metal.

The average distance between the plurality of first ridges is 0.1 mm or more and 1.0 mm or less, the average distance between the plurality of second ridges is 0.1 mm or more and 1.0 mm or less, and the first region. The average distance between the second regions is 0.2 mm or more and 1.5 mm or less. As a result, in the metal base plate material, the average distance between the first ridges, the average distance between the second ridges, and the average distance between the first region and the second region are appropriately adjusted, so that the condensate can be mixed. Can be discharged efficiently.

The amount of displacement in the longitudinal direction between the first end portion and the second end portion is preferably 0.1 mm or more and 5.8 mm or less. As a result, in the metal base plate material, the amount of displacement in the longitudinal direction between the first end portion and the second end portion is appropriately adjusted, so that the condensate can be appropriately dispersed.

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

It is a schematic plan view which partially shows the surface of the metal base plate material of one Embodiment of this invention. It is a schematic perspective sectional view which shows the AA cross section in the vicinity of the surface of the metal original plate material of FIG. 1 partially.

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

[Metal original plate material]
The metal base plate 1 of FIG. 1 is a metal base plate used for a heat exchange plate built in a plate heat exchanger. The material of the metal original plate material 1 is not particularly limited, but for example, titanium is used. The metal original plate material 1 is a flat plate material used as a material for manufacturing a heat exchange plate, and when it is incorporated in a plate type heat exchanger, it is formed into a heat exchange plate by press working. The metal original plate material 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 or more and 1.0 mm or less is used.

On the surface of the metal original plate material 1, a plurality of strip-shaped first regions 2 and a plurality of strip-shaped second regions 3 are provided in parallel and alternately. The surface including the first region 2 and the second region 3 may be at least one surface of the metal base plate material 1, and even if only one side of the metal base plate material 1 is provided, the metal base plate material 1 may have only one surface. It may be double-sided.

<First area>
The first region 2 is a strip-shaped region provided on the surface of the metal original plate material 1, and a plurality of first regions 2 are provided substantially in parallel. Each first region 2 has a plurality of first ridges 21 arranged substantially parallel and at substantially equal intervals so that the angle of intersection with the longitudinal direction is θ1.

As the lower limit of the average width Z1 in the lateral direction of the first region 2, 1 mm is preferable, 2 mm is more preferable, and 3 mm is further preferable. On the other hand, the upper limit of the average width Z1 is preferably 20 mm, more preferably 18 mm, and even more preferably 16 mm. If the average width Z1 is less than the above lower limit, the stirring action of the working medium with respect to the steam may not be sufficiently obtained, and the condensation of the working medium may not be promoted. On the contrary, when the average width Z1 exceeds the above upper limit, the condensate may stay in the first region 2 and the condensate may not be efficiently discharged. The "mean width" indicates a value obtained by averaging the widths of any five points in one object.

(1st article)
In the first region 2, a plurality of first ridges 21 are provided substantially parallel and at substantially equal intervals. The first ridge 21 is a rod-shaped ridge that is elongated in a plan view, and both ends thereof have a length that reaches both sides of the band-shaped first region 2. In FIG. 1, the shape of the first ridge 21 is substantially rectangular, but the first ridge 21 may have two long sides substantially parallel to each other in a plan view, and both ends thereof, for example. It may have a curved shape. Further, 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.

The intersection angle θ1 between the first ridge 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 condensate. As the lower limit of the intersection angle θ1, 10 degrees is preferable, 12 degrees is more preferable, and 13 degrees is further preferable. On the other hand, the upper limit of the intersection angle θ1 is preferably 25 degrees, more preferably 22 degrees, and even more preferably 20 degrees. If the intersection angle θ1 does not meet the above lower limit, the condensate may not be properly guided along the side side of the first ridge 21. On the contrary, if the intersection angle θ1 exceeds the above upper limit, the condensate may stay in the first region 2 and may not be efficiently discharged. The "intersection angle" refers to an acute angle among the two angles formed when the two straight lines intersect.

The lower limit of the average width a1 in the lateral direction of the first ridge 21 is preferably 0.10 mm, more preferably 0.11 mm, and even more preferably 0.12 mm. On the other hand, the upper limit of the average width a1 is preferably 1.0 mm, more preferably 0.8 mm, and even more preferably 0.6 mm. If the average width a1 does not meet the above lower limit, the strength of the first ridge 21 may be insufficient. On the contrary, when the average width a1 exceeds the above upper limit, the condensate may flow down the upper surface of the first ridge 21 and the condensate may not be properly guided along the side side of the first ridge 21.

The lower limit of the average distance b1 between the two first ridges 21 is preferably 0.1 mm, more preferably 0.2 mm, and even 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 even more preferably 0.8 mm. If the average distance b1 is not 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 guided along the side side of the first ridge 21. On the contrary, if the average distance b1 exceeds the above upper limit, the condensate may stay between the first ridges 21 and may not be discharged efficiently. The "average distance" is the average of the distances in the lateral direction of the ridges, and indicates the average value of any five distances between the two ridges.

The lower limit of the average height h of the first ridge 21 with respect to the surface of the metal base plate 1 is preferably 0.02 mm, more preferably 0.03 mm, and even more preferably 0.04 mm. On the other hand, the upper limit of the average height h is preferably 0.10 mm, more preferably 0.09 mm, and even more preferably 0.08 mm. If the average height h is less than the above lower limit, the stirring action of the working medium with respect to the steam may not be sufficiently obtained, and the condensation of the working medium may not be promoted. On the contrary, if the average height h exceeds the above upper limit, the processing cost may increase.

<Second area>
Similar to the first region 2, the second region 3 is a strip-shaped region provided on the surface of the metal original plate material 1, and a plurality of second regions 3 are provided substantially in parallel. Each second region 3 has a plurality of second ridges 31 that are substantially parallel and substantially evenly spaced at an angle θ2 facing the first ridges 21 in the lateral direction.

As the lower limit of the average width Z2 in the lateral direction of the second region 3, 1 mm is preferable, 2 mm is more preferable, and 3 mm is further preferable. On the other hand, the upper limit of the average width Z2 is preferably 20 mm, more preferably 18 mm, and even more preferably 16 mm. If the average width Z2 is not less than the above lower limit, the stirring action of the working medium with respect to steam may not be sufficiently obtained, and the condensation of the working medium may not be promoted. On the contrary, when the average width Z2 exceeds the above upper limit, the condensate may stay in the second region 3 and the condensate may not be efficiently discharged.

(2nd ridge)
In the second region 3, a plurality of second ridges 31 are provided substantially parallel and at substantially equal intervals. Like the first ridge 21, the second ridge 31 is an elongated rod-shaped ridge in a plan view, and both ends thereof have a length that reaches both sides of the strip-shaped second region 3. In FIG. 1, the shape of the second ridge 31 is substantially rectangular, which is the same as the shape of the first ridge 21, but the second ridge 31 is the same as the first ridge 21 in a plan view. It suffices if the two long sides are formed substantially parallel. Further, from the viewpoint of the balance of the flow amount of the condensate, the second ridge 31 has the same shape as the first ridge 21 in a 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 ridge 21 with respect to the surface of the metal base plate 1 as shown in FIG.

Since the second ridges 31 are arranged at an angle facing the first ridges 21 in the lateral direction, there are a plurality of the second ridges 31 when one of the longitudinal directions of the first region 2 and the second region 3 is the downstream direction. The first end portion 21a on the downstream side of the first ridge 21 and the second end portion 31a on the downstream side of the plurality of second ridges 31 are close to each other with the gap region 4 in between.

The intersection angle θ2 between the second ridge 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 condensate. As the lower limit of the intersection angle θ2, 10 degrees is preferable, 12 degrees is more preferable, and 13 degrees is further preferable. On the other hand, the upper limit of the intersection angle θ2 is preferably 25 degrees, more preferably 22 degrees, and even more preferably 20 degrees. If the intersection angle θ2 does not meet the above lower limit, the condensate may not be properly guided along the side side of the second ridge 31. On the contrary, if the intersection angle θ2 exceeds the above upper limit, the condensate may stay in the second region 3 and may not be efficiently discharged. From the viewpoint of the 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 are equal.

The lower limit of the average width a2 in the lateral direction of the second ridge 31 is preferably 0.10 mm, more preferably 0.11 mm, and even more preferably 0.12 mm. On the other hand, the upper limit of the average width a2 is preferably 1.0 mm, more preferably 0.8 mm, and even more preferably 0.6 mm. If the average width a2 does not meet the above lower limit, the strength of the second ridge 31 may be insufficient. On the contrary, when the average width a2 exceeds the above upper limit, the condensate may flow down the upper surface of the second ridge 31, and the condensate may not be properly guided along the side side of the second ridge 31. From the viewpoint of the balance of the flow-down amount of the condensate, it is preferable that the average width a1 and the average width a2 are equal.

The lower limit of the average distance b2 between the two second ridges 31 is preferably 0.1 mm, more preferably 0.2 mm, and even more preferably 0.3 mm. On the other hand, the upper limit of the average distance b2 is preferably 1.0 mm, more preferably 0.9 mm, and even more preferably 0.8 mm. If the average distance b2 is not less than the above lower limit, the condensate may overflow to the upper surface of the second ridge 31, and the condensate may not be properly guided along the side side of the second ridge 31. On the contrary, if the average distance b2 exceeds the above upper limit, the condensate may stay between the second ridges 31 and may not be efficiently discharged. From the viewpoint of the balance of the flow-down amount of the condensate, it is preferable that the average distance b1 and the average distance b2 are equal.

When one of the longitudinal directions of the first region 2 and the second region 3 is the downstream direction, the first end portion 21a on the downstream side of the plurality of first ridges 21 and the second downstream side of the plurality of second ridges 31 The two ends 31a are displaced from each other in the longitudinal direction. As the displacement amount in the longitudinal direction between the first end portion 21a and the second end portion 31a, the displacement amount W1 when the first end portion 21a is on the downstream side of the second end portion 31a and the first end portion 21a are There is a deviation amount W2 when it is on the upstream side of the second end 31a, but from the viewpoint of the balance of the flow-down amount of the condensate, it is preferable that the deviation amount W1 and the deviation amount W2 are equal, but it is not particularly limited. The deviation amount W1 and the deviation amount W2 may be different. The downstream end of the ridge indicates the downstream end of the long side of the ridge on the upstream side.

The lower limit of the amount of deviation W1 in the longitudinal direction between the first end portion 21a and the second end portion 31a is preferably 0.1 mm, more preferably 0.6 mm, and even more preferably 1.0 mm. On the other hand, the upper limit of the average distance b2 is preferably 5.8 mm, more preferably 4.5 mm, and even more preferably 3.5 mm. If the deviation amount W1 does not meet the above lower limit, the 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. On the contrary, if the deviation amount W1 exceeds the above upper limit, the condensate may not be properly induced along the first ridge 21 and the second ridge 31. The lower and upper limits of the deviation amount W2 are the same as those of W1.

<Gap area>
The first region 2 and the second region 3 are separated from each other at substantially equal intervals via the gap region 4. The gap region 4 is a strip-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 the gap region 4 interposed therebetween. .. The gap region 4 is not formed with irregularities such as ridges, 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 0.2 mm, more preferably 0.3 mm, and even more preferably 0.4 mm. On the other hand, the upper limit of the average distance X is preferably 4.0 mm, more preferably 3.5 mm, and even more preferably 3.0 mm. If the average distance X is less than the above lower limit, the condensate may not be efficiently discharged. On the contrary, if the average distance X exceeds the above upper limit, the condensate may not be properly guided along the first ridge 21 and the second ridge 31.

(advantage)
The metal original plate material 1 is provided with a gap region 4 between the first region 2 and the second region 3, and the ends of the two types of ridges are shifted in the longitudinal direction of the first region 2 and the second region 3. Therefore, the concentration of the condensate between the ends of the two types of ridges can be suppressed, and the condensate can be appropriately dispersed. Further, the metal original plate material 1 is provided with two types of ridges so that the angle of intersection with the longitudinal direction of the first region 2 and the second region 3 is 10 degrees or more and 25 degrees or less. By suppressing the deceleration of the condensate, the condensate can be efficiently discharged.

Further, in the metal original plate material 1, the average distance b1 between the first ridges 21, the average distance b2 between the second ridges 31, and the average distance X between the first region 2 and the second region 3 are appropriately adjusted. Therefore, the condensate can be efficiently discharged.

Further, in the metal original plate material 1, since the amount of deviation W1 in the longitudinal direction between the first end portion 21a and the second end portion 31a is appropriately adjusted, the condensate can be appropriately dispersed.

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

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

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

As a performance test of heat transfer of condensation, No. The heat transfer rate was evaluated using the metal original plates 1 to 4. Hydrofluorocarbon (R134a) was used as the working medium in contact with the surface of the metal base plate, and cold water was used as the refrigerant in contact with the back of the metal base to condense the working medium. The working medium was flown into the surface of the metal base plate at a pressure of 0.68 MPa at an inflow temperature of 30 ° C. using a heater. The cold water flowed into the back surface of the metal base plate material 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, the channel depth was 2 mm. The heat transfer 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. It was calculated using the difference in the inflow temperature of.

The surface of the metal original plate material to be brought into contact with the working medium is as follows. In addition, No. The metal base plate materials 1 and 2 are the metal base plate material 1 of the above-described embodiment, and No. Regarding the metal base plate material 3 of the above-described embodiment, the intersection angle θ between the ridge and the longitudinal direction of the region where the ridge is provided, the distance X between the regions where the ridge is provided, and the ridge are the same. Each of the widths Z in the lateral direction of the area where is provided is outside the range of the embodiment. In addition, No. The metal original plate material of No. 4 is a flat plate material having no ridges on its surface. In addition, No. The first and second ridges of the metal base plates 1 to 3 have the same shape.

[No. 1 metal original plate material]
The height of the ridges h: 0.05 mm, the width of the ridges in the lateral direction a: 0.125 mm, the distance between the ridges b: 0.6 mm, and the length of the ridges and the region where the ridges are provided. Intersection angle θ: 15 degrees, distance between regions where ridges are provided X: 0.98 mm, width Z in the lateral direction of the region where ridges are provided: 4.88 mm, displacement in the longitudinal direction between the ends of the ridges Amount W: 1.4 mm
[No. 2 metal original plate material]
The height of the ridges h: 0.05 mm, the width of the ridges in the lateral direction a: 0.125 mm, the distance between the ridges b: 0.6 mm, and the length of the ridges and the region where the ridges are provided. Intersection angle θ: 15 degrees, distance between regions where ridges are provided X: 0.49 mm, width Z in the lateral direction of the region where ridges are provided: 2.44 mm, displacement in the longitudinal direction between the ends of the ridges Amount W: 1.4 mm
[No. 3 metal original plate material]
The height of the ridges h: 0.05 mm, the width of the ridges in the lateral direction a: 0.125 mm, the distance between the ridges b: 0.6 mm, and the length of the ridges and the region where the ridges are provided. Intersection angle θ: 45 degrees, distance X between areas where ridges are provided: 4 mm, width Z in the lateral direction of the area where ridges are provided: 20 mm, amount of displacement in the longitudinal direction between the ends of ridges W: 0 mm

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

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

1 Metal base plate 2 1st area 3 2nd area 4 Gap area 21 1st ridge 21a 1st end 31 2nd ridge 31a 2nd end

Claims (1)

Built in the plate heat exchanger, a metal original plate used in the heat exchanger plate you discharged dispersed condensate of the working medium,
At least one surface
A plurality of strip-shaped first regions and a plurality of strip-shaped second regions are provided in parallel and alternately.
The strip-shaped first region is
It has a plurality of first ridges that are substantially parallel and substantially evenly spaced so that the angle of intersection with the longitudinal direction is 10 degrees or more and 25 degrees or less.
The strip-shaped second region is
It has a plurality of second ridges that are substantially parallel and substantially evenly spaced at an angle facing the plurality of first ridges in the lateral direction.
The first region and the second region are separated from each other at substantially equal intervals via a gap region.
When one of the longitudinal direction of the first region and the second region is the downstream direction, the first end portion on the downstream side of the plurality of first ridges and the second portion on the downstream side of the plurality of second ridges. and the end portion are offset from each other in the longitudinal direction,
The average distance between the plurality of first ridges and between the plurality of second ridges is 0.1 mm or more and 1.0 mm or less.
The average distance between the first region and the second region is 0.2 mm or more and 4.0 mm or less.
The amount of displacement 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 average width of each of the short direction of the first region and the short direction of the second region is 1 mm or more and 20 mm or less.
The average width of each of the plurality of first ridges and the plurality of second ridges in the lateral direction is 0.10 mm or more and 1.0 mm or less.
The average height of each of the plurality of first ridges and the plurality of second ridges is 0.02 mm or more and 0.10 mm or less.
Both ends of the plurality of first ridges have a length that reaches both sides of the first region.
Both ends of the plurality of second ridges have a length that reaches both sides of the second region.
Metal original plate material is Ru titanium der.

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