JP2005106412A - Junction-type plate heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a junction-type plate heat exchanger inhibiting the short path of the fluid in a spatial flow channel formed in a fluid flow channel between cassette plates, by heat transfer face joint parts formed on the heat transfer faces of the cassette plates as recessed grooves continuous from flat end parts, and to improve the heat transferring performance. <P>SOLUTION: An arrangement pattern of the heat transfer face joint parts of the cassette plates is determined in such manner that the heat transfer face joint parts of both cassette plates are not overlapped to each other in stacking the desired number of cassette plates 1 provided with the heat transfer face joint parts 14 formed by permanently joining the heat transfer faces 7 of two sheets of longitudinally rectangular corrugated plates 2. This determination of the arrangement pattern is achieved by forming a pair of cassette plates adjacent to each other by two kinds of cassette plates respectively manufactured by using different molds, or forming the pair of cassette plates adjacent to each other by the same kind of cassette plates manufactured by using the same mold, and reversing one of the cassette plates to the other in stacking. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joining type plate heat exchanger in which two or more thin plate plates press-molded into a corrugated corrugated plate are permanently joined partially by laser welding or the like, and a necessary number of cassette plates are laminated via a gasket.

  Bonded plate heat exchangers consist of a set of two thin plates press-molded into a corrugated wave shape, and a cassette plate in which the seals of the two plates are permanently joined together by laser welding or brazing. And a flow path through which two fluids to be heat-exchanged flow is formed in the cassette plate and between the cassette plates. The necessary number of cassette plates are stacked and sandwiched by pressure-resistant frames from the front and rear. At this time, the shape between the plates is maintained at the contact support point where the ridgelines of the wave and concave waves of the heat transfer surfaces of adjacent plates are in contact with each other, and the pressure strength is ensured.

  As shown in FIG. 5, the cassette plate of such a junction-type plate heat exchanger is formed by superposing two substantially rectangular plates 2 press-molded into an uneven corrugated plate and joining the periphery thereof. It is. The plate 2 has passage holes 3 to 6 serving as fluid inlets and outlets at four corners, and a heat transfer surface 7 at the center. The plate 2 is superposed as a pair of two, and as shown by the broken line portion in FIG. 5, the seal portion joint portion 11 surrounding the heat transfer surface 7 and the upper and lower two passage holes 3 and 4, and the remaining two passage holes 5. , 6 are joined to the passage hole joints 12 and 13 surrounding each of them. On the outer surface (surface) of each of the two plates 2, a trapezoidal gasket 21 that surrounds the heat transfer surface 7 and the upper and lower two passage holes 5, 6 and a circular gasket that surrounds each of the remaining two passage holes 3, 4. Wear 22 and 23. The junction type plate heat exchanger is obtained by stacking a plurality of such cassette plates 1 via gaskets 21 to 23 and sandwiching and fixing them with a pressure frame (not shown) from the front and rear.

  As shown by a chain line arrow in FIG. 5, the junction type plate heat exchanger includes a passage hole 3, a fluid passage A inside the cassette plate 1, a first passage communicated by the passage hole 4, and a passage hole. 6. Between the stacked cassette plates 1, a fluid channel B surrounded by the gasket 21 and a second channel connected by the passage hole 5 are formed. In this bonded plate heat exchanger, the corrugated wave shapes of the plates are in contact with each other between the plates, so that the shape of the plate is maintained against the force acting on the heat transfer surface such as the pressure difference of the fluid. The pressure resistance performance is secured.

  When a fluid containing solid matter or fiber is caused to flow through the fluid flow path of the joining type plate heat exchanger, the solid matter or fiber is caught or clogged at the plate contact support point. Therefore, in a plate heat exchanger applied to a fluid containing solids and fibers, it is desirable to form a fluid flow path that does not provide a plate contact support point between two plates.

  As shown in FIG. 6, as a method of preventing the plate contact support point from being provided, the heat transfer surface 7 of the plate 2 of the cassette plate 1d is permanently joined 14d by laser welding or brazing to maintain the shape of the cassette plate 1d. In addition, a structure in which plate contact support points are not provided in the flow path between the cassette plates 1d while ensuring pressure resistance performance is known (see, for example, Patent Document 1). The gasket-side fluid flow path formed between the cassette plates of this bonded plate heat exchanger has no plate contact support point, so solids and fibers can be caught without causing solids or fibers to be caught or clogged. A fluid containing quality can flow.

  For example, the cassette plate 1 d shown in FIG. 6 has two heat transfer surface joining portions 14 d in the vertical direction on both side portions of the heat transfer surface 7. The two heat transfer surface joining portions 14d secure the pressure resistance of the cassette plate 1d itself, and appropriately regulate the flow direction of the fluid flowing through the fluid flow path A inside the cassette plate 1d.

FIG. 6 is a perspective view of a pair of cassette plates 1d before being stacked. The front side of another cassette plate 1d is stacked on the back side of the cassette plate 1d on the left side of the same figure. FIG. 7 shows a cross section of the heat transfer surface when the pair of cassette plates 1d are stacked. By stacking the pair of cassette plates 1d, the fluid flow paths A inside the cassette plates and the fluid flow paths B between the cassette plates are alternately arranged in the stacking direction. In addition, the fluid flow path B between cassette plates does not have a plate contact support point, and can distribute | circulate the fluid containing a solid substance and a fiber here favorably.
JP 2001-272194 A (FIG. 2)

  In the heat exchanger shown in FIG. 7, a utility fluid such as hot water or cooling water is allowed to flow through the permanent joint side fluid flow path A, and a fluid containing solids or fibers is caused to flow through the gasket side fluid flow path B. There is good heat exchange between the seed fluids. However, a space channel B1 larger than the channels on both sides of this portion is formed in the portion where the heat transfer surface joining portions 14d of the pair of cassette plates 1d adjacent to each other face and overlap each other. Since the gasket-side fluid flow path B is continuous for a predetermined length in the fluid flow direction, the fluid may short-pass in the space flow path B1, resulting in a decrease in heat transfer performance. That is, the heat transfer surface joining portions 14d of both cassette plates 1d are formed at the flat end portions N of the respective plates 2, and when the heat transfer surface joining portions 14d face each other and overlap, the flat end portions N and the flat end portions N are connected. Since they face each other, a space channel B1 having a cross-sectional area approximately twice that of the flat end space can be formed along the fluid flow direction.

  Therefore, the flow resistance of the fluid is reduced in the space flow path B1, and a short path in which more fluid flows in the space flow path B1 than the others is generated, and the heat transfer performance is deteriorated because the flow is not uniform. Furthermore, since the flat portions N ′ of the two plates are in close contact with each other at the flat end N of the heat transfer surface joining portion 14d forming the space flow path B1, the heat transfer area at this location is not ensured, and the space The flow of the fluid short-passed in the flow path B1 receives the heat transfer x1 mainly from only the plate slope of the mountain portion M, so that the amount of heat transfer is small compared to other flow paths. Therefore, the fluid (small heat transfer) that flows through the space channel B1 through a short path and the fluid (large heat transfer) that flows through the other fluid channel B flow into the outlet (passage hole) as they are, and are merged at the outlet. Heat transfer performance is not obtained. In particular, in a process of a high viscosity fluid or a food fluid, the temperature distribution of the treatment liquid becomes non-uniform and satisfactory quality may not be obtained.

  An object of the present invention is to provide a junction-type plate heat exchanger in which a decrease in heat transfer performance due to a heat transfer surface junction in the fluid flow path between cassette plates is reduced.

  In order to achieve the above object, the present invention welds the seal portions of the two plates and the joint portions formed linearly in the fluid flow direction of the heat exchange medium to the corrugated heat transfer surfaces of the two plates. Alternatively, the required number of cassette plates permanently bonded by brazing are stacked via gaskets, and the permanent bonding side fluid flow paths in the cassette plates and the gasket side fluid flow paths between the cassette plates are alternately formed in the stacking direction. In a plate heat exchanger, each cassette has a heat transfer surface bonding portion in which the plate heat transfer surface bonding portions of the cassette plate are permanently bonded to each other in an arrangement pattern in which the heat transfer surface bonding portions of a pair of adjacent cassette plates do not overlap each other. It is characterized by being formed on a plate.

  Here, the two plates constituting the cassette plate are vertically elongated thin corrugated plates that are press-molded into irregularities, and have two kinds of passage holes for two kinds of fluids in the upper part and the lower part, and the central part is a heat transfer surface. Is done. The heat transfer surfaces of the two plates and the peripheral seals surrounding the pair of upper and lower passage holes are permanently joined together by laser welding or the like, and the heat transfer surfaces of the two plates are linear along the fluid flow direction. The provided joints are permanently joined by laser welding or the like to form a heat transfer surface joint. The linear shape of the heat transfer surface joining portion is a straight line or an arc curve, and both are along the flow direction of the fluid flowing in the fluid flow path between the cassette plates. Further, the heat transfer surface joining portion is formed in a concave groove shape in which the flat end portion of the corrugated plate is connected to the cassette plate. The number and length of the heat transfer surface joints in the cassette plate are not limited and can be varied. When the pair of cassette plates are overlapped with each other, the arrangement pattern of the heat transfer surface junctions of each cassette plate is set so that the heat transfer surface junction of one cassette plate does not overlap the heat transfer surface junction of the other cassette plate. Decide. By doing so, a space flow having a larger cross-sectional area than the other can be obtained by overlapping the groove-shaped heat transfer surface joints in the fluid flow path between the cassette plates formed by superposing a pair of cassette plates. The road cannot be formed, and short paths can be prevented and reduced, and the heat transfer performance can be improved.

  In the present invention, a pair of cassette plates adjacent to each other can be constituted by two types having different arrangement patterns of the respective heat transfer surface bonding portions.

  In this case, a necessary number of two types of cassette plates are alternately stacked to produce a junction-type plate heat exchanger. The two types of cassette plates mean that there are two different types of molds for press-molding the plates into irregularities. The two types of molds differ in the arrangement pattern of the flat portions for forming the permanent joints formed on the heat transfer surface of the plate. The arrangement pattern of the heat transfer surface junctions of the two types of cassette plates is that one cassette plate forms a linear heat transfer surface junction in the center of the heat transfer surface in a single or multiple pattern, and the other cassette plate is linear The heat transfer surface joining portion is made different by forming a single or a plurality of patterns in a portion excluding the central portion of the heat transfer surface. If it does in this way, even if it superposes | stacks two types of cassette plates alternately, mutual heat-transfer surface junction parts do not overlap.

  Further, in the present invention, when a pair of cassette plates adjacent to each other has the same arrangement pattern of the respective heat transfer surface joint portions and one of the pair of cassette plates is inverted 180 ° up and down with respect to the other, It can comprise with the same kind of arrangement pattern in which a mutual heat-transfer surface junction part does not overlap.

  In this case, the required number of cassette plates of the same type are stacked together to produce a junction-type plate heat exchanger, so that one mold can be used for the production of cassette plates, reducing production costs. It becomes possible. The same type of cassette plate has gasket mounting grooves and passage holes formed in a vertically and horizontally symmetrical pattern, heat transfer surface joints on the heat transfer surface are symmetrical and formed in a vertically asymmetrical arrangement pattern. It is practically effective. When a plurality of the cassette plates are prepared and the cassette plates are turned upside down by 180 ° and stacked, the heat transfer surface joining portions of the adjacent cassette plates do not overlap each other, and the object of the present invention is achieved.

  According to the present invention, since a space channel having a large cross-sectional area that can overlap the groove-shaped heat transfer surface bonding portions between a pair of superposed cassette plates cannot be formed, the fluid flow between the cassette plates can be reduced. The short path is suppressed, heat transfer performance is improved, and particularly in the process of a high viscosity fluid or food fluid, the temperature distribution of the treatment liquid can be easily uniformed and high quality can be obtained.

  Hereinafter, a bonded plate heat exchanger according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to the same member and site | part as the cassette plate 1 mentioned above.

  As shown in FIG. 1, the bonded plate heat exchanger according to the first embodiment is obtained by stacking two types of cassette plates 1 a and 1 b.

  One cassette plate 1a of this junction type plate heat exchanger is obtained by superposing two vertically long rectangular corrugated plates 2 and permanently joining them. The heat transfer surface 7 and the upper and lower two passage holes 3, 4 are connected. The enclosing seal portion joining portion 11, the passage hole joining portions 12 and 13 surrounding each of the other two passage holes 5 and 6, and the heat transfer surface joining portion 14 a formed in the center of the heat transfer surface 7 in a straight line in the vertical direction. Are permanently joined. As shown in FIG. 2, the heat transfer surface bonding portion 14 a abuts flat portions N ′ formed on the flat end N of the corrugated corrugated heat transfer surface 7, and is permanently bonded by laser welding or the like. The cassette plate 1a is provided with a trapezoidal gasket 21 that surrounds the heat transfer surface 7 and the upper and lower two passage holes 5 and 6, and circular gaskets 22 and 23 that surround the remaining two passage holes 3 and 4, respectively. .

  The other cassette plate 1b is the same as the one cassette plate 1a, and the arrangement pattern of the heat transfer surface joining portions 14b formed on the heat transfer surface 7 is arranged on one side on both sides except for the center of the heat transfer surface 7. Each is formed linearly in the longitudinal direction along the fluid flow direction.

  This junction type plate heat exchanger is obtained by alternately stacking these two types of cassette plates 1a and 1b.

  As shown in FIG. 2, the bonded plate heat exchanger has a gasket-side fluid flow path B between the cassette plates that does not have a plate contact support point and is suitable for flowing a fluid containing solids and fibers. Become a road. In this gasket-side fluid flow path B, the heat transfer surface bonding portion 14a at the center of the heat transfer surface formed on one cassette plate 1a and the heat transfer surface bonding portions provided on both side portions of the heat transfer surface of the other cassette plate 1b. 14b are laterally displaced from each other and do not overlap, and the heat transfer surface bonding portions 14a and 14b formed at the flat end N of the corrugated plate face the mountain portions Mb and Ma of the mating plate. Yes.

  Therefore, in the space flow path B2 formed between each heat transfer surface bonding portion 14a and the mating plate, the flow path surrounded by the heat transfer surface bonding portion 14a and the mountain portion Mb, the heat transfer surface bonding portion 14a and the flat end. The flow paths surrounded by the portions Nb ′ are alternately formed, and also in the spatial flow path B3, the flow paths surrounded by the heat transfer surface bonding portion 14b and the flat end portion Na, the heat transfer surface bonding portion 14b, and the mountain portion Ma ′. Since the enclosed flow paths are alternately formed, there is no difference in flow resistance of the flow paths. For this reason, a short path | pass is suppressed and there is no possibility that heat transfer performance may fall by a short path | pass. Moreover, since the top surfaces and flat end portions Na and Nb ′ and the slopes of the ridges Ma ′ and Mb of the mating plate facing the heat transfer surface joining portions 14a and 14b receive heat movement x2 and x3 as heat transfer surfaces, It becomes a means to make uniform heat transfer to the whole. In fact, in the process of high viscosity fluid or food fluid, the temperature distribution of the treatment liquid can be made uniform, and satisfactory quality can be obtained.

  As mentioned above, although the joining type plate type heat exchanger which concerns on 1st Embodiment was demonstrated, the heat-transfer surface junction part 14a, 14b of a pair of cassette plate 1a, 1b of this joining type plate type heat exchanger is each arrangement | sequence. The pattern can be changed to various patterns, and the present invention is not limited to the above embodiment.

  Next, a bonded plate heat exchanger according to a second embodiment of the present invention will be described.

  As shown in FIG. 3, a cassette plate 1c of a joining plate type heat exchanger according to the second embodiment is obtained by permanently joining two vertically long plates 2 and includes a heat transfer surface 7 and two upper and lower passages. The seal joint 11 that surrounds the holes 3 and 4 and the passage hole joints 12 and 13 that surround each of the other two passage holes 5 and 6 are formed vertically and horizontally symmetrically. The gasket 21 surrounding the two passage holes 5 and 6 and the gaskets 22 and 23 surrounding the remaining two passage holes 3 and 4 are mounted symmetrically vertically and horizontally. Here, “vertical symmetry” means that the object is with respect to the horizontal center line of the vertically long rectangular plate 2, and “lateral symmetry” is that it is an object with respect to the vertical center line of the plate. means.

  The cassette plate 1c includes two heat transfer surface joints 14c and 14e formed in the vertical direction on both upper side portions of the heat transfer surface 7 and one line formed in the vertical center in the lower center of the heat transfer surface 7. The heat transfer surface joint portion 14f is welded. As shown in FIG. 3, the cassette plate 1 is used by being alternately inverted 180 ° and stacked.

  As shown in FIG. 4, the transverse cross section of the heat transfer surface when the cassette plates 1c are laminated is such that the permanent-bonding-side fluid flow path A inside the cassette plate and the gasket-side fluid flow path B between the adjacent cassette plates are alternated. Are lined up. Among these, the gasket-side fluid flow path B has no plate contact support point, and is a flow path suitable for circulating a fluid containing solids and fibers. Further, since the heat transfer surface bonding portions 14c, 14e and 14f of the adjacent cassette plates 1c and 1c are vertically asymmetric, in the gasket side fluid flow path B, the heat transfer surface bonding portion heat transfer surface bonding portion 14c of both cassette plates. , 14e do not overlap, and in this case, the heat transfer surface joints 14c, 14e formed at the flat end N of the corrugated plate plate respectively face the peaks Mb, Me of the mating plate, 14f faces the mountain part Mc.

  Therefore, the space flow path B4 formed between each heat transfer surface bonding portion 14c and the mating plate includes a flow path surrounded by the heat transfer surface bonding portion 14c and the mountain portion Mb, and the heat transfer surface bonding portion 14c. And the flow path surrounded by the flat end portion Nc are alternately formed, and also in B5, the flow path is surrounded by the heat transfer surface bonding portion 14f and the mountain portion Mc, and the heat transfer surface bonding portion 14f and the flat end portion Nf. The flow paths are alternately formed. Furthermore, in B6, the flow path surrounded by the heat transfer surface bonding portion 14e and the peak portion Me and the flow path surrounded by the heat transfer surface bonding portion 14e and the flat end portion Ne are alternately formed. There is no difference in flow resistance. For this reason, a short path is suppressed and a heat-transfer performance fall can be prevented. Furthermore, the top surfaces or slopes of the ridges Mb and Mc of the mating plate facing the heat transfer surface bonding portions 14c and 14f receive heat movements x4 and x5 as the heat transfer surfaces and face the heat transfer surface bonding portions 14e. Since the flat portion Ne of the mating plate receives the heat transfer x6 as a heat transfer surface, it becomes a means for uniformly transferring heat to the entire flow.

  According to the junction type plate heat exchanger of this 2nd Embodiment, since it can comprise by the cassette plate which has one kind of heat-transfer surface junction part junction part, manufacturing cost can be made cheap.

  In addition, the joining plate type heat exchanger of this invention is not limited to said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

It is a perspective view which shows the cassette plate of the joining type plate heat exchanger of 1st Embodiment. FIG. 2 is a partially enlarged cross-sectional view showing a heat transfer surface when the cassette plates of FIG. 1 are stacked. It is a perspective view which shows the cassette plate of the joining type plate type heat exchanger of 2nd Embodiment. FIG. 3 is a partial enlarged cross-sectional view showing a heat transfer surface when the cassette plates of FIG. 2 are stacked. It is a perspective view of the cassette plate used with the conventional joining type plate type heat exchanger. FIG. 6 is a perspective view when a heat transfer surface bonding portion is formed on the cassette plate of FIG. 5 and two sheets are stacked. FIG. 7 is a partial enlarged cross-sectional view of a heat transfer surface when the two cassette plates of FIG. 6 are stacked.

Explanation of symbols

1, 1a-1c Cassette plate 2 Plate 3-6 Passage hole 7 Heat transfer surface 11-13 Joining portion 14a-14f Heat transfer surface joining portion 21-23 Gasket A, B Fluid flow path B2-B6 Spatial flow path M Yamabe N flat end x2 to x6 heat transfer

Claims (3)

A cassette plate in which the joint portions formed linearly in the fluid flow direction of the heat exchange medium are permanently joined to each other by welding or brazing between the seal portions of the two plates and the corrugated heat transfer surfaces of the two plates. In the junction type plate heat exchanger in which the required number of layers are stacked via gaskets, and the permanent junction side fluid flow path in the cassette plate and the gasket side fluid flow path between the cassette plates are alternately formed in the stacking direction,
The heat transfer surface bonding portions obtained by permanently bonding the heat transfer surface bonding portions of the cassette plates are formed on each cassette plate in an arrangement pattern in which the heat transfer surface bonding portions of a pair of adjacent cassette plates do not overlap each other. A junction plate heat exchanger.   2. The junction type plate heat exchanger according to claim 1, wherein the pair of cassette plates adjacent to each other is composed of two or more types having different arrangement patterns of the respective heat transfer surface junctions.   When the pair of cassette plates adjacent to each other have the same arrangement pattern of the heat transfer surface bonding portions and when one of the pair of cassette plates is turned upside down with respect to the other, the heat transfer surface bonding portions overlap each other. 2. The junction type plate heat exchanger according to claim 1, wherein the joint type plate heat exchanger is constituted by the same kind of arrangement patterns which do not match.

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