JP3040215B2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger in which a plurality of plates having heat transfer surfaces are stacked at a predetermined interval.

[0002]

2. Description of the Related Art Referring to FIGS. 7 and 8, a conventional example of a plate-type heat exchanger frequently used for air conditioning of a building will be described. A plate-type heat exchanger is formed by laminating and integrating a plurality of substantially rectangular plates 1 as shown in FIG. The plate 1 has a passage hole 2 for the heat exchange medium at four corners and a heat transfer surface 3 at the center, and an elastic gasket 4 is mounted around the heat transfer surface 3 and the passage hole 2. The gasket 4 has a pair of upper and lower passage holes 2 on one side of the plate 1.
(A passage hole through which one heat exchange medium flows), a first gasket part 4a surrounding the heat transfer surface 3, and a second gasket part solely surrounding the remaining two passage holes 2 (the passage hole through which the other heat exchange medium flows). 4b, which are mounted between each plate 1. When the plates 1 are vertically stacked, as shown in FIG. 8, a plurality of passage holes 2 and gaskets 4 are arranged in a horizontal series.
One hole channel 5 ′ and a vertical plate channel 6 between each plate are formed.

[0003] As shown in FIG. 8, a gasket 4 in one hole flow passage 5 'is formed by alternately arranging a first gasket portion 4a and a second gasket portion 4b and forming a passage hole at a position where the first gasket portion 4a is present. 2 and every other plate channel 6 are communicated. With such communication of the holes, a first flow path system 10 shown by a chain line in FIG. 7 and a second flow path system 11 shown by a broken line in FIG.
Is formed. When a first heat exchange medium such as primary water is fed into the hole flow path 5 'of the first flow path system 10, the first heat exchange medium flows through the hole flow path 5' as shown by the arrow in FIG. Are partly branched and flow down every other plate channel 6. At the same time, a second heat exchange medium such as secondary water flows through the second flow path system 11, and heat exchange between the first and second heat exchange media via the heat transfer surface 3 of each plate 1. Done.

[0004]

The performance of the plate heat exchanger is based on the heat transfer performance of the plate itself and the flow performance of the heat exchange medium in the hole passage 5 'and the plate passage 6 formed between the plates. Greatly depends on the two. The former heat transfer performance is enhanced by the press-formed shape of the heat transfer surface 3 of the plate 1. The latter flow performance is determined by the magnitude of the pressure loss of the heat exchange medium flowing through the hole channel 5 ′ and the plate channel 6.

In general, mounting of the gasket 4 on the plate 1 is performed by fitting the gasket 4 into a gasket groove 9 formed on a peripheral portion of the plate 1.
This gasket groove 9 is press-molded, and especially near the passage hole 2, as shown in FIG.
a is formed apart from the peripheral edge 2 a of the passage hole 2. The gasket 4 is housed in the gasket groove 9 and the plate 1
When the gasket 4 is laminated, the gasket 4 is elastically deformed and slightly protrudes inward and outward, but the protruding amount is not so large. For example, in the periphery of the passage hole 2, the inner peripheral portion of the gasket 4 It is on the outer diameter side retracted from 2a. Therefore, as shown in FIG. 8, the inner wall surface of the hole flow path 5 ′ formed by the passage hole 2 and the gasket 4 of the plate 1 is an uneven surface where the peripheral end of the passage hole 2 protrudes from the gasket 4. The uneven direction of the uneven surface is in a direction orthogonal to the flow direction of the passage hole of the heat exchange medium. Therefore, the flow of the heat exchange medium is hindered by the uneven wall surface of the hole flow path 5 ', and the heat exchange medium does not flow smoothly in the hole flow path 5', and a large pressure loss occurs in the heat exchange medium in the hole flow path 5 '. As a result, the flow performance of the heat exchanger is reduced, and accordingly, the number of plates 1 required for securing desired performance is increased, and the heat exchanger is increased in size and increased in cost.

An object of the present invention is to provide a plate heat exchanger in which the pressure loss of a heat exchange medium in a hole flow passage between plates is reduced to improve the overall flow performance.

[0007]

According to the present invention, a plate having a heat transfer surface, a passage hole for a heat exchange medium, and a gasket groove provided in the vicinity of the passage hole and separated from the periphery of the passage hole is provided. A first hole surrounding the passage hole through which the heat exchange medium flows and the heat transfer surface
It has a gasket portion and a second gasket portion surrounding the passage hole through which the other heat exchange medium flows, and is laminated at a predetermined interval via a gasket fitted in the gasket groove. It has a formed tubular hole flow path and a plate flow path formed between the heat transfer surfaces of the plates communicating with the hole flow path, and the first heat exchange medium is supplied to the odd-numbered row of plate flow paths. And a plate heat exchanger in which a second heat exchange medium is caused to flow through even-numbered plate flow paths and heat is exchanged between the first and second heat exchange media via the plates. Of the two gasket portions, a protruding portion protruding toward the passage hole is integrally formed around each of the passage holes, and the protruding portion is used to connect a wall portion of the hole flow passage to a portion communicating with the corresponding plate flow passage. Except for the smooth surface in the axial direction, It is intended to achieve the target.

[0008] A similar object is to stack a plurality of plates having a heat transfer surface and a passage hole for a heat exchange medium at predetermined intervals, to form a tubular hole passage formed by the passage holes of each plate, Plate passages formed between the heat transfer surfaces of the plates communicating with the passages, wherein the first heat exchange medium is provided in the odd-numbered plate passages and the second heat exchange medium is provided in the even-numbered plate passages. In a plate-type heat exchanger in which a medium flows and heat is exchanged between a first heat exchange medium and a second heat exchange medium via a plate, a filling material filled between passage hole peripheral portions of each plate is used as a wall surface of a hole flow path. To
This can also be attained by forming a smooth surface in the axial direction except for a portion communicating with the corresponding plate channel.
Alternatively, the wall surface of the hole flow path may be a smooth surface in the axial direction except for a portion communicating with the corresponding plate flow path by a burring portion bent in the orthogonal direction from the end of the passage hole of each plate.

[0009]

When the wall surface of the hole passage between the plates is made smooth with a filler or the like, the flow resistance of the heat exchange medium flowing through the hole passage is reduced, and the pressure loss generated in the heat exchange medium is greatly reduced. Due to the effect of reducing the pressure loss, the flow performance of the heat exchanger is further improved, and a high-performance plate heat exchanger can be realized with a small number of plates.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments will be described below with reference to FIGS. 1 and 2 show the first embodiment, FIG. 3 shows the second embodiment, FIG. 4 shows the third embodiment, and FIG.
FIG. 6 shows a fourth embodiment. Throughout the drawings including FIG. 7 and FIG. 8, the same or corresponding parts are denoted by the same reference numerals, and detailed description is omitted.

In the plate type heat exchanger shown in the first embodiment of FIGS. 1 and 2, a wall of a hole flow path 5 formed by laminating a plurality of plates 1 via a gasket 4 It is characterized in that a smooth surface m is formed in the flow direction of the passage hole by utilizing. It is desirable to perform the hole flow path 5 having such a smooth wall surface for all four corner flow paths of the plate 1, but it is also possible to selectively perform only one to three hole flow paths. Good.

FIG. 2 shows an upper part 1 of a vertically-standing plate 1.
The hole channel 5 at the corner is shown, and its specific structure will be described. The plate 1 has the same shape as the conventional one, has a heat transfer surface 3 at the center and passage holes 2 at the four corners, and is alternately inverted by 180 ° and stacked. Gasket 4 mounted between plates
Has a first gasket portion 4a and a second gasket portion 4b which are the same as the conventional one. First and second gasket portions 4
Projections 4c and 4d protruding toward the passage hole are respectively formed in the periphery of the passage hole 2 of the passage holes a and 4b. Of these, the protruding portion 4c of the first gasket portion 4a is
As shown in FIG. 2B, the first gasket portion 4a has a substantially semicircular shape that is integral with the first gasket portion 4a and has substantially no half in the direction of the heat transfer surface 3 of the plate 1. The protrusion 4d of the second gasket portion 4b is ,
As shown in FIG. 2A, the passage hole 2 is completely covered with a circular shape integral with the second gasket portion 4b. Both projections 4c,
The inner edge of 4d has the same inner diameter as the corresponding passage hole 2. The broken lines in FIGS. 2A and 2B indicate the inner edge 9a of the gasket groove 9, and the inner edge 9a
As in the prior art, each passage hole 2
From the outer edge 2a of the outer circumference.

When a plurality of plates 1 are laminated via a gasket 4 in the same manner as in the prior art, the wall surface of the hole flow channel 5 is removed by the inner peripheral portions of the two projecting portions 4c and 4d except for a portion communicating with the plate flow channel 6. Thus, a smooth surface m is formed in the flow direction of the passage hole 2. When the first heat exchange medium flows through the hole flow path 5, the first heat exchange medium smoothly flows along the smooth surface m, and a part of the opening 12 lacking the projections 4c alternately arranged between the plates. Flows down to the plate channel 6 from Therefore, the flow resistance of the first heat exchange medium flowing through the hole flow path 5 is reduced, so that the pressure loss generated in the heat exchanger is reduced. The improvement of the flow performance enables the following. When a product having the same performance as a conventional product is manufactured, the number of plates can be reduced and the whole can be reduced in size.

The second embodiment shown in FIG. 3 is a modification of the first embodiment. This is one in which approximately half of the projecting portion 4d of the second gasket portion 4b on the heat transfer surface 3 side is omitted. In other words, the second gasket part 4b
Of the first gasket portion 4a is formed in the same substantially semicircular arc shape. In this second embodiment,
The plate flow path 6 side of the hole flow path 5 becomes an uneven surface, but since this uneven surface is a portion where the heat exchange medium flows into the plate flow path 6, there is almost no problem with respect to pressure loss.

The third embodiment shown in FIGS. 4A and 4B is similar to the first embodiment except that the projecting portions 4c and 4d of the gasket 4 are different from each other.
In this case, the wall surfaces of the hole flow path 5 are made to have a smooth surface m with the packing materials 7a and 7b corresponding to the above. The fillers 7a and 7b are rubber, resin, metal, and the like, which are different from the gasket 4,
Together with the plate 1. Filling 7a, 7b
May be fixed to the plate 1 by bonding, welding, brazing, or the like. If such fillers 7a and 7b are used, a conventional product can be used for the gasket 4.

In the fourth embodiment shown in FIGS. 5 and 6, the passage hole 2 of the plate 1 is burred so that the wall surface of the hole passage 5 has a smooth surface m in the flow direction of the passage hole. .
That is, the next first plate 1a and second plate 1b are prepared for the plate 1. The first plate 1a
As shown in FIG. 6A, the front end of the passage hole 2 is substantially half (FIG.
(A region similar to the protruding portion 4c of the first gasket portion 4a shown in (b)) has a semicircular first burring portion 8a which is bent in the orthogonal direction. FIG. 6 shows the second plate 1b.
As shown in (b), it has a cylindrical second burring portion 8b bent in the orthogonal direction from the tip of the passage hole 2. The axial widths of the first and second burring portions 8a and 8b are the same, and the first and second plates 1a and 1b are alternately stacked via the gasket 4, and the tips of the burring portions 8a and 8b correspond to each other. Of the passage holes 2 of the plates 1a and 1b. Then, the passage holes 2 of the plates 1a and 1b and the inner surfaces of the burring portions 8a and 8b are flush with each other, and the hole flow path 5
Is a smooth surface m in the axial direction. In the case of the fourth embodiment,
The heat exchange medium flowing through the hole flow path 5 flows down from the opening 13 of the first plate 1a where the first burring portion 8a is not provided to the plate flow path 6. Also in this case, a conventional product can be used for the gasket 4. Needless to say, when the burring direction is set to the opposite direction to that of the present embodiment, the first plate 1a is provided with a cylindrical burring, and the second plate 1b is provided.
In this case, burring in a semicircular arc shape may be performed.

[0017]

According to the present invention, the flow resistance of the heat exchange medium flowing through the hole flow path is reduced by making the wall surface of the hole flow path between the plates smooth with a filler or the like. This has the effect of significantly reducing the pressure loss occurring in the medium and improving the flow performance of the heat exchanger. Further, by improving the flow performance, the number of plates used in the heat exchanger can be reduced and downsized, and the cost of the heat exchanger can be reduced.

Further, the width of the first and second gaskets is increased around the passage hole due to the formation of the projection, so that the sealing performance around the passage hole can be improved. Also,
Since the protruding portion protrudes toward the passage hole, it is possible to avoid such a problem that the protruding portion reduces the heat transfer area.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing a first embodiment of the present invention.

2A is a front view along the line AA in FIG. 1; FIG. 2B is a front view along the line B in FIG. 1B;

FIG. 3 is a partial longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4A is a partial longitudinal sectional view showing a third embodiment of the present invention, and FIG. 4B is a sectional view taken along line CC of FIG.

FIG. 5 is a partial longitudinal sectional view showing a third embodiment of the present invention.

6A is a cross-sectional view taken along a line D-D in FIG. 5; and FIG. 6B is a cross-sectional view taken along a line E-E in FIG.

FIG. 7 is a perspective view of a conventional plate heat exchanger when a plate is assembled.

8 is a partial longitudinal sectional view of a conventional plate heat exchanger assembled with the plate of FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 plate 1a plate 1b plate 2 passage hole 2a peripheral edge 3 heat transfer surface 4 gasket 4a first gasket portion 4b second gasket portion 4c projecting portion 4d projecting portion 5 hole flow path 6 plate flow path m smooth surface 7a filling 7b filling 8a Burring section 8b Burring section 9 Gasket groove 9a Inner edge

Claims (3)

(57) [Claims] 1. A heat transfer surface, a passage hole of a heat exchange medium, and a passage hole of a heat exchange medium .
Gasket provided near and separated from the periphery of passage hole
The plate having the grooves is passed through one of the heat exchange media.
The first gasket surrounding the passage hole and the heat transfer surface and the other heat
A second gasket surrounding the passage hole through which the exchange medium flows.
A gasket fitted in the gasket groove is laminated at a predetermined interval, and a tubular hole flow path formed by a passage hole of each plate and each of the holes communicating with the hole flow path are formed. Having a plate flow path formed between the heat transfer surfaces of the plates, flowing the first heat exchange medium through the odd-numbered plate flow paths, and flowing the second heat exchange medium through the even-numbered plate flow paths, In a plate heat exchanger for exchanging heat between a first heat exchange medium and a second heat exchange medium via a plate, among the first gasket portion and the second gasket portion,
Protrusions that protrude toward the passage hole side around each passage hole
A plate heat exchanger, wherein the plate heat exchanger is integrally formed, and the projection has a wall surface of the hole flow passage which is smooth in the axial direction except for a portion communicating with the corresponding plate flow passage. 2. A plurality of plates each having a heat transfer surface and a passage hole for a heat exchange medium are stacked at a predetermined interval, and a tubular hole passage formed by the passage hole of each plate communicates with the hole passage. Plate flow paths formed between the heat transfer surfaces of the respective plates, wherein the first heat exchange medium flows through the odd-numbered row of plate flow paths, and the second heat exchange medium flows through the even-numbered row of plate flow paths. In the plate heat exchanger for exchanging heat between the first and second heat exchange media via the plate, the filling material filled between the peripheral portions of the passage holes of each plate corresponds to the wall surface of the hole flow path. To communicate with the plate channel
Except for having a smooth surface in the axial direction except for the plate heat exchanger. 3. A plurality of plates each having a heat transfer surface and a passage hole for a heat exchange medium are laminated at predetermined intervals, and a tubular hole passage formed by the passage hole of each plate communicates with the hole passage. Plate flow paths formed between the heat transfer surfaces of the respective plates, wherein the first heat exchange medium flows through the odd-numbered row of plate flow paths, and the second heat exchange medium flows through the even-numbered row of plate flow paths. In a plate heat exchanger for exchanging heat between the first and second heat exchange media via a plate, the wall surface of the hole flow path is formed by a burring portion bent in the orthogonal direction from the end of the passage hole of each plate. The corresponding said plate channel
A plate type heat exchanger characterized by having a smooth surface in the axial direction except for a portion communicating with the plate heat exchanger.