JP2016044896A - Laminate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a laminate type heat exchanger having dimples in which a pressure loss of internal fluid between plates is made to be the same as that of a laminate type heat exchanger having herringbone stripes.SOLUTION: Several dish-shaped plates of the same shape are laminated to form their cores, a pair of communicating holes and a pair of bypass holes are arranged at four corners of the dish-shaped plates, C-shaped ribs are protruded at circumferential edges of the pair of communication holes while their opening sides are being repelled to each other and many dimples are protruded at the heat transfer surfaces. Such dish-shaped plates are rotated by 180° in a circumferential direction for every plate and laminated. Then, the plates are formed in such a way that each fluid is flowed from one communication hole to the other communication hole while like a threading between the dimples while bypassing C-shaped ribs.SELECTED DRAWING: Figure 1

Description

  The present invention is a stacked heat exchanger in which a core is formed by stacking a plate-like plate with a large number of dimples protruding on the surface, and the fluid flowing between the plates is made uniform. In particular, the present invention relates to a small flow rate of fluid flowing inside.

A heat exchanger described in Patent Document 1 has been proposed as a heat exchanger that forms a core by stacking metal plates.
This metal plate has an outer periphery formed in a substantially rectangular plane, and has a pair of communication holes and a pair of bypass holes at the four corners of the plane portion, and avoids them to form a helibone wave (plane V shape). It has a heat transfer surface provided with an uneven strip.
A large number of such metal plates are stacked via a gasket to form a core, and the core has a first flow path through which the first fluid flows and every second plate, and a second flow path through which the second fluid flows. Are alternately formed.
The first fluid and the second fluid exchange heat through the heat transfer surface.

  In this helibone type heat exchanger, a fluid flows along a flow path formed by the helibone. And since the flow path has a certain flow resistance with respect to the used flow rate, when the number of plates is increased, the fluid flows without considering the flow distribution.

JP 2000-97581 A

However, the cup plate having a large number of dimples targeted by the present invention suppresses the pressure loss of the fluid by the large number of dimples. Therefore, when the number of stacked plates is increased, more fluid flows to the plate near the inlet, not to all the plates, and drift occurs. In particular, when the flow rate is a small flow rate of 0.5 L / min or less, the drift is remarkable. Therefore, the present invention has been confirmed by various experiments to confirm that the cup plate with dimples is effective in preventing the drift, and the present invention has been completed.
That is, the present invention relates to a stacked heat exchanger in which dimples are provided on the heat transfer surface, and even if the flow rate of each fluid flowing through the interior is low, the stacked heat exchanger does not cause a drift in each plate. A container is provided.

The present invention according to claim 1 has three or more flat plate-like plates (2) having a substantially rectangular plane with side walls (2b) formed on the outer periphery,
At the four corners of the flat surface portion (2a) of the dish-shaped plate (2), a pair of communication holes (3) and a pair of bypass holes (4) whose rims project annularly are provided,
A plurality of the plate-like plates (2) are laminated so as to be in contact with the side wall portion (2b) to form a core (7), and the first fluid (13) is alternately arranged every other plate-like plate (2). In the stacked heat exchanger in which the first flow path (8) and the second flow path (9) of the second fluid (14) are formed,
At the periphery of the pair of communication holes (3), a plane C-shaped rib (5) has its opening (5a) located on the side away from each other, and its opening (5a) is a dish-shaped plate (2 ) Projecting toward the edge side of each of the flow paths,
At a position avoiding the bypass hole (4) and the rib (5), the flat plate portion (2a) of the plate-like plate (2) has a heat transfer surface projecting a large number of dimples (6),
The bypass hole (4), the rib (5), and the dimple (6) are provided on the same side in the thickness direction, and their tops are in contact with the flat surface of the adjacent plate-like plate (2). Placed in
The core (7) is laminated by rotating the plate-like plate (2) 180 degrees in the circumferential direction one by one,
A pair of inlet / outlet holes (11) communicating with the first channel (8) and a pair of inlet / outlet holes (11) communicating with the second channel (9) are provided at both ends of the core (7) in the stacking direction. ) Is formed,
Each of the fluids (13) and (14) bypasses the C-shaped rib (5) and sews between the dimples (6) from one communication hole (3) to the other communication hole (3). It is a lamination type heat exchanger characterized by circulating in.
It is.

According to a second aspect of the present invention, in the stacked heat exchanger according to the first aspect,
The flow rates of the first fluid (13) and the second fluid (14) are low flow rates,
The laminated heat is characterized in that the opening angle α of the opening (5a) of the C-shaped rib (5) is 60 degrees or more and 180 degrees or less with reference to the center of the communication hole (3). It is an exchanger.

According to a third aspect of the present invention, in the stacked heat exchanger according to the first or second aspect,
The first fluid (13) and the second fluid (14) communicate with the first channel (8) and a pair of inlet / outlet holes (11) and the second channel (9) so that the first fluid (13) and the second fluid (14) are opposed to each other. A stacked heat exchanger characterized in that a pair of inlet / outlet holes (11) are arranged.

According to a fourth aspect of the present invention, in the stacked heat exchanger according to any one of the first to third aspects,
The dish-shaped plate (2) is formed in a plane rectangle,
The pair of communication holes (3) is disposed on one side in the width direction of the dish-shaped plate (2), and the pair of bypass holes (4) are disposed on the other side in the width direction. It is a mold heat exchanger.

In the present invention, the core is formed by laminating a large number of dish-shaped plates having the same shape, and a pair of communication holes and a pair of bypass holes are arranged at the four corners of the dish-shaped plate. A C-shaped rib protrudes at the periphery of the opening, with the opening side being separated from each other, and a large number of dimples protrude from the heat transfer surface. Each such plate is rotated and rotated 180 degrees in the circumferential direction. And each fluid distribute | circulates from one communicating hole to the other communicating hole so that it may sew between each dimple, bypassing a C-shaped rib.
According to this structure, the C-shaped rib forms a detour, and fluid flows as uniformly as possible between a large number of dimples having a relatively small fluid resistance. Furthermore, the C-shaped rib has an effect of forming a weir on the outlet side of the communication hole, distributing the fluid uniformly to each plate, and eliminating drift between the plates. That is, the flow rate between the plates can be made uniform with a relatively simple structure.

In the above configuration, when the opening angle α of the opening of the C-shaped rib is set to 60 degrees or more and 180 degrees or less with respect to the center of the communication hole, the flow rate of each fluid flowing through the flow path inside the core Even if it is small, an extreme drift in each flow path is suppressed, and a stacked heat exchanger that can balance heat exchange performance and fluid pressure loss can be provided.
The said structure WHEREIN: It can design so that the distribution direction of a 1st fluid and a 2nd fluid may become a counterflow in each flow path. With this configuration, a more efficient stacked heat exchanger can be provided.

The disassembled perspective view which shows the Example of the laminated heat exchanger of this invention. It is the top view (A) of the plate-shaped plate 2 which comprises the same heat exchanger, Comprising: (B) is the BB arrow sectional drawing, (C) is CC arrow sectional drawing of (A), (D) is the DD arrow sectional view of (A), (E) is the EE arrow sectional view of (A), (F) is the F section enlarged view of (A). III-III arrow sectional drawing of FIG. The assembly perspective view of the heat exchanger. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4. The VII section enlarged view of FIG. It is a comparison figure of the pressure loss of the heat exchanger of this application and the heat exchanger using the plate-shaped plate 2 of a comparative example, a vertical axis | shaft is pressure loss (%), and a horizontal axis is C-shape of the heat exchanger of this application. The figure which plotted the opening angle (degree) of the rib 5 of a shape. The top view which shows the comparative example of the plate-shaped plate 2 of a laminated | stacked heat exchanger. The assembly perspective view showing the 2nd example of the lamination type heat exchanger of this application. The assembly perspective view showing the 3rd example of the lamination type heat exchanger of this application.

Next, embodiments of the present invention will be described with reference to the drawings.
1 to 7 show a first embodiment of the present invention, FIG. 1 is an exploded perspective view thereof, and FIG. 2 (A) is a plan view of a plate-like plate 2 used in a heat exchanger. 3 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is an assembled perspective view of the laminated heat exchanger, FIG. 5 is a sectional view taken along the line VV in FIG. 4, and FIG. It is VI-VI arrow directional cross-sectional view. FIG. 2B and subsequent figures are as described in the brief description of the drawings.

The feature of the present invention lies particularly in the structure of each dish-like plate 2 constituting the core 7.
The core 7 is formed by alternately rotating the dish-like plate 2 of FIG. 2 by 180 °.
Each dish-like plate 2 is formed in the same shape by press molding, and as shown in FIG. 2 (A), a flat surface portion 2a is formed in a rectangular shape in a plan view, and the peripheral portion thereof has a shape shown in FIG. ) Has a side wall portion 2b that is slanted downward. A pair of communication holes 3 and a pair of bypass holes 4 having annularly projecting hole edges are arranged at the four corners of the flat surface portion 2a of the dish-shaped plate 2. The pair of communication holes 3 are disposed on one side in the width direction of the dish-shaped plate 2, and the pair of bypass holes 4 are disposed on the other side in the width direction.

As shown in FIG. 2 (A), C-shaped ribs 5 are located on the edges of the longitudinal direction at the peripheral edges of the pair of communication holes 3, and the openings 5a are separated from each other. So as to protrude. The opening 5a is formed with an opening angle α of 60 degrees or more and 180 degrees or less with respect to the center of the communication hole 3, and the C-shaped rib 5 serves as a weir (each fluid bypasses the rib 5). The fluid flowing through the core 7 is uniformly distributed between the dimples. Further, the weir by the rib 5 surrounds the outlet side of the fluid in the communication hole in a C shape, and has an action of uniformly distributing the fluid to each dish-like plate and eliminating the drift between the plates.
A heat transfer surface with a large number of dimples 6 is formed on the outer peripheral edge of the bypass hole 4 and on the flat surface 2a of the dish-like plate 2 avoiding the ribs 5. As shown in FIG. 3, the projecting height of the bypass hole 4, the projecting height of the rib 5, and the projecting height of the dimple 6 are substantially aligned with each other, and further, they project in the direction opposite to the side wall 2b. It is installed.

Such a plate-like plate 2 rotates 180 degrees in the circumferential direction for each sheet, and a plurality of layers are laminated so as to be in liquid-tight contact with the side wall portion 2b to form the core 7. At this time, the tip of each dimple 6 abuts against the flat surface of the opposing dish-like plate 2 (see reference numeral 6 in FIG. 7). Accordingly, the arrangement of the dimples 6 is provided in a distributed manner so as to be in contact with the flat surface of the opposing dish-like plate 2. And the top part of each dimple 6 contacts so that it may be arrange | positioned between each dimple 6 of the adjacent plate-shaped plate 2. Further, as shown in FIGS. 5 and 6, the top portion of the projecting portion of the bypass hole 4 is in contact with the hole edge of the communication hole 3 of the adjacent plate-like plate 2, and the top portion of the rib 5 is It abuts on the flat surface portion 2 a of the outer peripheral portion of the bypass hole 4 of the adjacent plate-like plate 2.
Then, the first flow path 8 for the first fluid 13 and the second flow path 9 for the second fluid 14 are alternately formed on every other plate-shaped plate 2 forming the core 7.

End plates 10 provided with an inlet / outlet hole 11 for the first fluid 13 and an inlet / outlet 11 for the second fluid 14 are disposed at both ends of the core 7 in the stacking direction. As shown in FIG. 6, the pair of inlet / outlet holes 11 of the first fluid 13 are in communication with the first flow paths 8, and the pair of inlet / outlet holes 11 of the second fluid 14 are connected to the first passage 13 as shown in FIG. It communicates with the second flow path 9.
Further, the cover plate 12 is attached from the outside of the end plate 10. The cover plate 12 is formed with pipe mounting holes at positions corresponding to the respective inlet / outlet holes 11 of the end plate 10, and an inlet / outlet pipe 15 for the first fluid 13 and an inlet / outlet pipe 16 for the second fluid 14 are formed in the holes. Mounted.
In such an assembled state, the components are integrally brazed and fixed in a high-temperature furnace to complete the laminated heat exchanger 1 (FIG. 4) of the present application.

In the laminated heat exchanger of this example, the core 7 is normally arranged in the direction of gravity, the first fluid 13 is circulated so as to rise from below to above, and the second fluid 14 passes from above to below. It is distributed to flow down. That is, the fluids 13 and 14 are circulated so as to face each other.
Then, water to be heated flows through the first flow path 8 as the first fluid 13, and hot hot water flows through the second flow path 9 as the second fluid 14. Their flow rates are relatively small and are circulated at 1 L / min or less.

(Performance)
FIG. 8 shows a laminated heat exchanger having a heat transfer surface provided with the dimple 6 of the present invention and a conventional laminated heat exchanger having a heat transfer surface provided with a herringbone strip shown in FIG. This is a comparison of pressure loss. In the laminated heat exchanger having the herringbone strips (the convex strips having a “U” shape in plan view parallel to the longitudinal direction in the longitudinal direction) in this figure, the one having no C-shaped ribs 5 is formed. Used. The top of the strip is designed to contact the adjacent plate.
In the case of the stacked heat exchanger having the herringbone strip, the strip itself becomes a resistor, so that the flow path of each plate is uniformly distributed regardless of the number of stacked plates 2. The pressure loss is about 110 hPa.

  In the laminated heat exchanger having dimples, when the C-shaped ribs 5 are not provided, the pressure loss is less than 60 hPa, and each fluid passes substantially between the dimples. Uneven.

In view of this, the present inventor, in the laminated heat exchanger having the dimple 6, uses the opening 5a of the C-shaped rib 5 as a reference with respect to the center of the communication hole 3 so that the pressure loss is equal to that of the herringbone strip. The pressure loss test was performed by changing the opening angle α.
As a result, it was found that the opening angle α was 75 hPa at 180 °, 110 hPa at 60 °, and approached the pressure loss of the herringbone stacked heat exchanger in the range of 60 ° to 180 °. Preferably, it was found that a pressure loss equivalent to that of the herringbone strip can be obtained by setting in the range of 60 ° to 120 °.
On the other hand, when the opening angle α is 45 ° or less, the pressure loss exceeds 120 hPa, and the flow resistance is excessively increased, which may cause clogging.

(Other examples of fluid flow direction)
It is also possible to change the arrangement of the pipes of the stacked heat exchanger 1 of the first embodiment and to distribute the fluid as shown in FIGS. Also in this case, the fluids 13 and 14 flowing through the respective flow paths 8 and 9 are designed to be opposed flows, and the flow rate is set to a low flow rate as in the first embodiment.
In the case of FIG. 10, the two flows circulate inside the core in a Z shape, and in the case of FIG. 11, the flows circulate in a U shape.

  The laminated heat exchanger of the present invention can be mainly used for a heat exchanger for hot water supply in which the flow rate of fluid flowing inside is small. However, it can also be used for other heat exchangers such as oil coolers.

DESCRIPTION OF SYMBOLS 1 Laminate type heat exchanger 2 Dish plate 2a Plane part 2b Side wall part 3 Communication hole 4 Bypass hole 5 Rib
5a Opening 6 Dimple

7 cores
DESCRIPTION OF SYMBOLS 8 1st flow path 9 2nd flow path 10 End plate 11 Entrance / exit hole 12 Cover plate 13 1st fluid 14 2nd fluid 15 Entrance / exit pipe 16 Entrance / exit pipe

Claims (4)

Having three or more dish-like plates (2) having a substantially rectangular plane with side walls (2b) formed on the outer periphery;
At the four corners of the flat surface portion (2a) of the dish-shaped plate (2), a pair of communication holes (3) and a pair of bypass holes (4) whose rims project annularly are provided,
A plurality of the plate-like plates (2) are laminated so as to be in contact with the side wall portion (2b) to form a core (7), and the first fluid (13) is alternately arranged every other plate-like plate (2). In the stacked heat exchanger in which the first flow path (8) and the second flow path (9) of the second fluid (14) are formed,
At the periphery of the pair of communication holes (3), a plane C-shaped rib (5) has its opening (5a) located on the side away from each other, and its opening (5a) is a dish-shaped plate (2 ) Projecting toward the edge side of each of the flow paths,
At a position avoiding the bypass hole (4) and the rib (5), the flat plate portion (2a) of the plate-like plate (2) has a heat transfer surface projecting a large number of dimples (6),
The bypass hole (4), the rib (5), and the dimple (6) are provided on the same side in the thickness direction, and their tops are in contact with the flat surface of the adjacent plate-like plate (2). Placed in
The core (7) is laminated by rotating the plate-like plate (2) 180 degrees in the circumferential direction one by one,
A pair of inlet / outlet holes (11) communicating with the first channel (8) and a pair of inlet / outlet holes (11) communicating with the second channel (9) are provided at both ends of the core (7) in the stacking direction. ) Is formed,
Each of the fluids (13) and (14) bypasses the C-shaped rib (5) and sews between the dimples (6) from one communication hole (3) to the other communication hole (3). A laminated heat exchanger characterized by being distributed to The stacked heat exchanger according to claim 1, wherein
The flow rates of the first fluid (13) and the second fluid (14) are low flow rates,
The laminated heat is characterized in that the opening angle α of the opening (5a) of the C-shaped rib (5) is 60 degrees or more and 180 degrees or less with reference to the center of the communication hole (3). Exchanger. In the laminated heat exchanger according to claim 1 or 2,
The first fluid (13) and the second fluid (14) communicate with the first channel (8) and a pair of inlet / outlet holes (11) and the second channel (9) so that the first fluid (13) and the second fluid (14) are opposed to each other. A laminated heat exchanger, wherein a pair of inlet / outlet holes (11) are arranged. In the laminated heat exchanger according to any one of claims 1 to 3,
The dish-shaped plate (2) is formed in a plane rectangle,
The pair of communication holes (3) is disposed on one side in the width direction of the dish-shaped plate (2), and the pair of bypass holes (4) are disposed on the other side in the width direction. Mold heat exchanger.

Images