JP2016099093A - Plate-type heat exchanger and its paired plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide paired plates of a plate-type heat exchanger capable of allowing a fluid to flow out to the external in occurrence of fluid leakage inside, and properly joining two sheets of upper and lower heat transfer plates.SOLUTION: In paired plates P1, P2 of a plate-type heat exchanger in which upper and lower heat transfer plates 1A, 1B are overlapped to each other so that a peripheral wall portion 11a of the upper heat transfer plate 1A is externally fitted to a peripheral wall portion 11b of the lower heat transfer plate 1B, and a lower end edge of the peripheral wall portion 11a is brazed to the peripheral wall portion 11b, at least one flange portion 12 projecting outward with respect to the lower end edge of the peripheral wall portion 11a, is connected to the peripheral wall portion 11a of the upper heat transfer plate 1A, and the peripheral wall portions 11a, 11b are not brazed to each other at a position where the flange portion 12 is disposed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a so-called double wall type plate heat exchanger and a pair plate thereof.

As a specific example of the plate heat exchanger, there is a double wall specification in which a flow path for circulating two kinds of fluids as heat exchange target fluids is configured using a plurality of pairs of plates (for example, Patent Documents 1 to 3). The pair plate is obtained by superimposing and joining two upper and lower heat transfer plates having substantially the same shape and size.
According to such a configuration, even if a part of the pair plate is damaged and the fluid in the flow path leaks from the damaged part, the fluid is not located next to the flow path. Therefore, it is possible to prevent the two kinds of heat exchange target fluids from mixing with each other. In addition, the pair plate can have higher strength and longer overall durability compared to a heat transfer plate (non-pair plate) that is formed by processing a single metal plate, for example. is there.

  However, the prior art has room for improvement as described below.

In other words, when an abnormal situation occurs in which the fluid in the flow channel flows into the inside of the pair plate (the gap between the two upper and lower heat transfer plates) due to part of the pair plate being damaged, etc. It would be desirable to be able to detect that fact appropriately. As a method for detecting the occurrence of the above-described abnormality, there is a method in which the fluid that has flowed into the pair plate is caused to flow out of the pair plate, and this fluid is detected using a sensor or the like outside the pair plate. Conceivable.
In order to realize such a method, when joining the upper and lower two heat transfer plates constituting the pair plate, it is necessary to set so that the above-described gap can flow out of the pair plate. . Generally, brazing is adopted as a means for joining the heat transfer plates. However, when such brazing is performed, for example, the entire periphery of the two upper and lower heat transfer plates is brazed without gaps. This makes it difficult for fluid to flow out. If a part that is not brazed is partially provided, fluid can flow out to the outside of the pair plate, but it is difficult to finish properly to such specifications, and if brazing is inappropriate The strength of the pair plate cannot be secured sufficiently. In the past, this has been a problem.

Japanese Patent No. 2547231 Japanese Patent No. 3043066 Japanese Patent No. 5545198

  The present invention has been conceived under the circumstances as described above, and appropriately joins two upper and lower heat transfer plates while allowing fluid to flow to the outside when an internal fluid leak occurs. It is an object of the present invention to provide a pair plate of a plate-type heat exchanger that can be used, and a plate-type heat exchanger including the plate.

  In order to solve the above problems, the present invention takes the following technical means.

The pair plate of the plate-type heat exchanger provided by the first aspect of the present invention has upper and lower heat transfer structures each having a configuration in which a peripheral wall portion projecting downward is connected to the outer peripheral edge of the plate body portion. The upper and lower heat transfer plates are overlapped with each other such that the peripheral wall portion of the upper heat transfer plate is externally fitted to the peripheral wall portion of the lower heat transfer plate, and A lower plate edge of the peripheral wall portion of the upper heat transfer plate is brazed to the peripheral wall portion of the lower heat transfer plate, and is a pair plate of a plate heat exchanger, At least one flange portion projecting outward from the lower end edge of the peripheral wall portion is connected to the peripheral wall portion, and at the position where the flange portion is provided, the upper and lower sides are provided. Heat transfer It is characterized in that brazing of the peripheral wall to each other of the over bets are the avoidance configuration.
The above-mentioned configuration is a configuration in a state where the pair plate is set in a horizontal posture (positional relationship such as up and down), and the actual usage state of the plate heat exchanger provided with the pair plate (for example, the usage state of the lying down posture) ) Not the configuration below.

According to such a configuration, the following effects can be obtained.
First, the brazing in the above-described configuration is performed by, for example, placing a brazing material on the main body plate of the upper heat transfer plate and heating and melting, as will be described in the embodiments described later. It can be performed by flowing along the outer wall of the peripheral wall portion of the heat transfer plate and the peripheral wall portion of the lower heat transfer plate. When such a brazing method is employed, the brazing material is prevented from wrapping around the front end of the flange portion, and at the position where the flange portion is provided, the brazing between the peripheral wall portions of the upper and lower heat transfer plates is performed. It can be prevented from being attached. On the other hand, at a position where the flange portion is not provided, the molten brazing material is allowed to reach between the lower end edge of the peripheral wall portion of the upper heat transfer plate and the peripheral wall portion of the lower heat transfer plate, and this portion. Can be brazed. Thus, the brazing intended by the present invention can be realized by a simple method, and the production cost can be suppressed at a low cost.
Secondly, in the position where the flange portion is provided, brazing between the peripheral wall portions of the upper and lower heat transfer plates is avoided, so that this portion is placed on the upper and lower sides when fluid leakage occurs. It becomes possible to make it the part for making the fluid which flowed in between between the heat-transfer plates flow out outside. Therefore, when fluid leaks to the inside of the pair plate, it is useful for realizing accurate detection of this.
Thirdly, it is possible to appropriately braze the portions of the peripheral wall portions of the upper and lower heat transfer plates where the flange portion is not provided. Therefore, it is possible to appropriately ensure the bonding strength between the upper and lower heat transfer plates. In the present invention, it is possible to appropriately change the joining strength of the upper and lower heat transfer plates depending on the position and size of the flange portion, and the design and manufacture are easy.

  In this invention, Preferably, the said flange part is made into the form curved or bent in the upward shape.

According to such a configuration, when brazing, it is more reliably prevented that the molten brazing material passes over the front end of the flange portion and wraps around the lower side or the back side of the flange portion, and the fluid to the outside of the pair plate It is more preferable to ensure a portion that can flow out. Further, after the molten brazing material is temporarily stored on the upper surface of the flange portion, an action of flowing so as to be distributed to the side of the flange portion is obtained. This provides an effect of supplying a large amount of brazing material to a portion where the flange portion is not provided, and making brazing of this portion more reliable.

  In the present invention, preferably, a pair of upper and lower holes for passing a heat exchange target fluid are provided facing each other in the vicinity of each of the four corners of both plate body portions of the upper and lower heat transfer plates, And both the plate main-body parts are mutually joined via the brazing material surrounding the opposing area | region of a pair of said hole part, The said flange part is provided in the four corner parts of the surrounding wall part of the said upper heat exchanger plate. Yes.

  According to such a configuration, in the brazing material surrounding the opposing region of the pair of holes, the heat exchange target fluid passing through the pair of holes leaks between the upper and lower heat transfer plates. In addition to serving as a sealing material for preventing the above, it also serves to further increase the bonding strength of the upper and lower heat transfer plates. On the other hand, since the flange portion is provided in an arrangement corresponding to the pair of hole portions (four corner portions of the peripheral wall portion), in the vicinity of the portion where the pair of hole portions are provided, the pair plate is outside the pair plate. A portion capable of fluid outflow can be provided. This brings about an advantage that, when a fluid leak occurs at the location of the brazing material, the fluid can be quickly discharged out of the pair plate.

The plate heat exchanger provided by the second aspect of the present invention is characterized in that a pair plate of the plate heat exchanger provided by the first aspect of the present invention is used.
According to such a configuration, the same effect as described for the pair plate of the plate heat exchanger provided by the first aspect of the present invention can be obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a disassembled perspective view which shows an example of the plate type heat exchanger to which this invention was applied. It is principal part sectional drawing of the assembly state of the plate type heat exchanger shown in FIG. (A) is a perspective view of a pair plate of the plate-type heat exchanger shown in FIGS. 1 and 2, and (b) is a IIIb-IIIb cross-sectional view of (a). (A) is a disassembled perspective view of the pair plate shown in FIG. 3, (b) is the sectional drawing. FIG. 4 is a perspective view showing an example of a state in which a brazing material is placed on the upper surface of the pair plate shown in FIG. 3. (A) is a principal part perspective view which shows the state through which the molten brazing material flows, (b) is VIb-VIb sectional drawing of (a), (c) is VIc-VIc of (a). It is sectional drawing.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  The plate heat exchanger HE shown in FIG. 1 is used as, for example, a condenser of a heat pump, and performs heat exchange between two types of fluids such as a refrigerant such as an HFC refrigerant represented by R410 and hot water. It is what you do. This plate-type heat exchanger HE has a double wall specification, and the entire basic configuration itself is a conventionally known one except for specific configurations of first and second pair plates P1 and P2 described later. It is the same. Therefore, this point will be briefly described.

The plate heat exchanger HE includes an end plate 4 as a top plate, a plurality of first and second pair plates P1, P2, an end plate 50, and an end plate 4A as a bottom plate. These are all formed by pressing a metal plate made of stainless steel or the like, and the shape in plan view is substantially rectangular. These members are laminated in the thickness direction and brazed. In the drawing, the first and second pair plates P1, P2 and the like are shown in an upright state in which they are stacked in the vertical height direction, but the plate heat exchanger HE is in a sideways state unlike this. Often used in. In the following description, the arrangement of the upper and lower relationships of the respective parts is assumed to conform to the drawings.

  The end plate 4 is provided with a refrigerant inlet 41 and outlet 42, and hot water inlet 43 and outlet 44. The first and second pair plates P1 and P2 are alternately stacked one by one, so that the refrigerant flow paths 6A and the hot water flow paths 6B are alternately positioned in the vertical direction. Has been. Near the four corners of the first and second pair plates P1 and P2, openings 13 (13A to 13D) for passing the heat exchange target fluid are provided. The refrigerant supplied to the inlet 41 of the end plate 4 passes downward through the opening 13A, and part of the refrigerant proceeds to each of the plurality of refrigerant flow paths 6A, and flows through each flow path 6A. The hot and cold water that has passed through the opening 13B reaches the outlet 42 (see also FIG. 2). On the other hand, the hot water supplied to the inflow port 43 passes downward through the opening 13C, and a part thereof proceeds to each of the plurality of water flow paths 6B, and the water flowing through each flow path 6B. Passes upward through the opening 13D and reaches the outlet 44. When the refrigerant and hot water flow through such a path, heat exchange is performed between the refrigerant and the hot water via the first and second pair plates P1 and P2, and the refrigerant is condensed and hot water is heated.

  As shown in FIGS. 3 and 4, the first pair plate P1 is configured by combining upper and lower heat transfer plates 1A and 1B (the upper and lower heat transfer plates 1A and 1B are predetermined). However, this gap is schematically shown, and the gap is actually formed to be extremely small). These upper and lower heat transfer plates 1A and 1B have substantially the same shape and size except for the presence or absence of a flange portion 12 to be described later, and plate body portions 10a and 10b that are substantially rectangular in plan view, Peripheral wall portions 11a and 11b that are integrally formed with the plate body portions 10a and 10b and project downward from the outer peripheral edges of the plate body portions 10a and 10b. The plate main body portions 10a and 10b are provided in the vicinity of the four corner portions thereof so that the hole portions 13a and 13b constituting the opening portions 13 (13A to 13D) are vertically opposed to each other, and other than the positions where the hole portions 13a and 13b are formed. The wide region is configured as corrugated plate portions 14a and 14b having a cross-sectional wave shape. The corrugated plates 14a and 14b increase the heat transfer area, promote stirring of the refrigerant and hot water, and serve to increase the heat exchange efficiency.

  The peripheral wall portions 11a and 11b have a downward projecting shape inclined downward. A plurality of flange portions 12 are integrally connected to the peripheral wall portion 11a of the upper heat transfer plate 1A. Each flange part 12 protrudes toward the outer side of the peripheral wall part 11a rather than the lower end edge of locations other than the flange part 12 among the peripheral wall parts 11a. Each flange portion 12 is preferably curved or bent upwardly as shown in the partially enlarged view of FIG. 4, and the upper surface of each flange portion 12 is recessed. The plurality of flange portions 12 are provided at appropriate intervals in the longitudinal direction of the peripheral wall portion 11a, and are also provided at four corner portions of the peripheral wall portion 11a. On the other hand, a portion corresponding to the flange portion 12 is not provided in the peripheral wall portion 11b of the lower heat transfer plate 1B.

The upper and lower heat transfer plates 1A and 1B are overlapped with each other and brazed so that the peripheral wall portion 11a is externally fitted to the peripheral wall portion 11b. The brazing is performed between the lower end edge of the peripheral wall portion 11a and the outer surface of the peripheral wall portion 11b. However, in the portion where the flange portion 12 is provided (region Sa in FIG. 6A), the peripheral wall portions 11a and 11b are not brazed, and the other region Sb is a brazed region. ing. As clearly shown in FIG. 3B, the plate main body portions 10 a and 10 b are brazed via a plurality of brazing materials 90. The brazing material 90 has an annular shape that surrounds the opposing regions of the holes 13 a and 13 b that form the opening 13.

The brazing described above is performed by the following method, for example.
First, as shown in FIG. 5, a sheet-like brazing material 91 is disposed on the plate body 10a. The brazing material 91 is formed so as to avoid the opening 13, and is preferably sized to cover the upper surface of the plate body 10a with as large an area as possible. A brazing material 90 shown in FIG. 3B is also disposed between the upper and lower heat transfer plates 1A and 1B. In such a set state, the brazing materials 90 and 91 are heated and melted. Then, the brazing material 91 flows as shown by the arrow in FIG. Specifically, the molten brazing material flows along the outer surface of the peripheral wall portion 11a from the plate main body portion 10a of the upper heat transfer plate 1A, and further flows downward. In this process, in the region where the flange portion 12 is not provided, a part of the molten brazing material wraps around the lower region n1 of the lower end edge of the peripheral wall portion 11a shown in FIG. The outer surface of the part 11b is brazed.

  On the other hand, as shown in FIG. 6 (b), the molten brazing material does not wrap around the flange 12 at a location where the flange 12 is provided. For this reason, in the location in which the flange part 12 was provided, brazing between the surrounding wall parts 11a and 11b is not made. Since the flange portion 12 is curved or bent in an upward shape, the above-described wraparound of the molten brazing material is more reliably prevented. As shown in FIG. 6A, the molten brazing material that has reached the flange portion 12 flows from the flange portion 12 so as to be distributed to the left and right of the flange portion 12. The flow of the molten brazing material is useful for more reliably joining the peripheral wall portions 11a and 11b at a location where the flange portion 12 is not provided.

In FIG. 2, the second pair plate P2 is the same as the first pair plate P1 except for the configuration of the plate body portions 10a and 10b, which is slightly different from the first pair plate P1. It is a simple configuration. About some 2nd pair plates P2 shown in FIG. 2, the same code | symbol as 1st pair plate P1 shall be attached | subjected with respect to the element which is the same as or similar to 1st pair plate P1, The duplication description is Omitted.
Note that the brazing operation described with reference to FIGS. 5 and 6 is not performed individually for each of the first and second pair plates P1 and P2 when the plate heat exchanger HE is manufactured. In manufacturing the plate heat exchanger HE, first, by laminating the components of the plurality of first and second pair plates P1, P2, the plate heat exchanger HE in an unbrazed state is assembled, And by carrying this in a heating furnace and heating, brazing of each part will be performed collectively.

  Next, the operation of the plate heat exchanger HE will be described.

  First, of the first and second pair plates P1, P2, the first pair plate P1 will be described as a representative example. As already described with reference to FIG. 6, the region Sa in which the flange portion 12 is provided in the first pair plate P <b> 1 is not brazed between the peripheral wall portions 11 a and 11 b. Sa can be a portion for allowing the liquid flowing into the first pair plate P1 to flow out.

More specifically, for example, if there is an abnormality such as a crack in the lower heat transfer plate 1B or a gap in a brazed portion with the brazing material 90, the inner side (upper side) of the first pair plate P1 The fluid (refrigerant or hot water) flows into the gap between the lower heat transfer plates 1A and 1B. About such a fluid, it is possible to pass the position between both the surrounding wall parts 11a and 11b, and to flow out of the 1st pair plate P1 from the area | region Sa which is not brazed as mentioned above. As shown in FIG. 6B, the peripheral wall portions 11a and 11b are in contact with each other, and the fluid outflow gap is not actively provided, but the fluid has a predetermined pressure. Therefore, this pressure passes between the peripheral wall portions 11a and 11b and smoothly flows out of the first pair plate P1.

  In this way, if the fluid is allowed to flow out of the first pair plate P1, a fluid (refrigerant or hot water) is detected inside the first pair plate P1 by detecting the fact using an appropriate sensor. It is possible to accurately detect that an abnormal situation has occurred and take appropriate countermeasures. The flange portion 12 is provided at the four corners of the peripheral wall portion 11a, and a portion capable of fluid outflow is provided in the vicinity of the opening portion 13 (13A to 13D) for passing the heat exchange target fluid. When there is a fluid leak at the position, it is possible to quickly flow out the fluid from the positions of the four corners of the peripheral wall portion 11a to the outside.

The peripheral wall portions 11a and 11b of the upper and lower heat transfer plates 1A and 1B are appropriately brazed in the region Sb where the flange portion 12 is not provided. Further, the plate main body portions 10 a and 10 b are joined together via a brazing material 90. For this reason, it is possible to appropriately secure the bonding strength between the upper and lower heat transfer plates 1A and 1B. By appropriately selecting the number, arrangement, size, etc. of the flange portion 12, it is possible to optimize the bonding strength between the upper and lower heat transfer plates 1A, 1B, etc., and the first pair plate P1 It is also easy to design and manufacture.
The same action as described for the first pair plate P1 can be obtained for the second pair plate P2.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the pair plate and the plate heat exchanger according to the present invention can be variously modified within the intended scope of the present invention.

  The flange part said by this invention should just be provided in at least 1 place in the surrounding wall part of the heat exchanger plate, The concrete number and arrangement | positioning can be variously changed. Moreover, the flange part should just be the form which protruded toward the outward of the surrounding wall part rather than the lower end edge of the other part in which the flange part is not provided among the surrounding wall parts, and it is not necessarily curved or bent in the shape of a tip. You don't have to. The flange portion may be formed, for example, in a simple horizontal protruding form or in a sloping form.

  The plate heat exchanger according to the present invention is not limited to one used as a condenser of a heat pump, and can be used for other purposes. Therefore, the two types of fluids to be heat exchanged are not limited to the combination of the refrigerant and the hot water, and the specific types are not limited.

HE plate heat exchanger P1, P2 first and second pair plate (pair plate)
1A, 1B Upper and lower heat transfer plates 10a, 10b Plate body portions 11a, 11b Peripheral wall portion 12 Flange portions 13a, 13b Hole portions 90, 91 Brazing material

Claims (4)

The upper and lower heat transfer plates each having a configuration in which a peripheral wall portion projecting downward is continuously provided on the outer peripheral edge of the plate main body portion.
The upper and lower heat transfer plates are overlapped with each other such that the peripheral wall portion of the upper heat transfer plate is fitted over the peripheral wall portion of the lower heat transfer plate, and the upper heat transfer plate. The lower end edge of the peripheral wall portion is a pair plate of a plate heat exchanger that is brazed to the peripheral wall portion of the lower heat transfer plate,
At least one flange portion projecting outward from the lower end edge of the peripheral wall portion is connected to the peripheral wall portion of the upper heat transfer plate, and at a position where the flange portion is provided. A pair plate of a plate heat exchanger, wherein brazing of the peripheral wall portions of the upper and lower heat transfer plates is avoided. It is a pair plate of the plate type heat exchanger according to claim 1,
The flange part is a pair plate of a plate-type heat exchanger, wherein the flange part is bent or bent in an upward shape. A pair plate of the plate heat exchanger according to claim 1 or 2,
A pair of upper and lower holes for passing a heat exchange target fluid are provided in the vicinity of each of the four corners of both plate body portions of the upper and lower heat transfer plates, and both the plate body portions are Are joined to each other via a brazing material surrounding the opposing region of the pair of holes,
The flange portion is a pair plate of a plate heat exchanger provided at four corners of the peripheral wall portion of the upper heat transfer plate.   A plate-type heat exchanger, wherein the pair plate of the plate-type heat exchanger according to any one of claims 1 to 3 is used.

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