JPH0972685A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compatible the improvement in the strength of the peripheral edges of a plate with the improvement in the yield of the transfer surface. SOLUTION: The flat surface shapes of passage holes 2 as liquid exits provided at the four corners of a plate 1 are formed in an elliptical or substantially circular shape having a larger opening size in the lateral direction than that in the longitudinal direction, and the longitudinal centerline is rotated and disposed at an arbitrary angle with respect to the lateral direction.

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 each having a passage hole serving as a liquid inlet / outlet at four corners are laminated.

[0002]

2. Description of the Related Art Generally, in a plate heat exchanger, a plurality of plates are laminated with a gasket interposed therebetween to form a plurality of flow paths between the plates, and different kinds of liquids are alternately flowed through these flow paths. Heat is exchanged between the two liquids through the plate.

In such a plate heat exchanger, a plate (11) as shown in FIG. 3 is used. This plate (11) is provided with passage holes (12) serving as liquid inlets and outlets at four corners of a rectangular metal plate, and an uneven heat transfer surface (13) provided in the middle thereof. Synthetic rubber so that the passage holes (12) (12) communicate with the heat transfer surface (13) and the passage holes (12) (12) above and below the other side are doubly blocked from the heat transfer surface (13). Install a gasket (14) made of a heat-resistant elastic material such as
The plate heat exchanger having a plurality of flow paths is formed by rotating by 80 °, that is, by inverting and stacking.

[0004]

By the way, in this type of plate heat exchanger, when the processing flow rate is large, the flow velocity in the passage hole (12) is limited. It is necessary to design the opening area to be large. However, in the conventional plate heat exchanger, since the planar shape of the passage hole (12) of the plate (11) is circular, the passage hole (12)
In order to increase the opening area of, as shown in FIG.
The diameter of the passage hole (12) must be increased. However, if the diameter of the passage hole (12) is increased, the vertical dimension of the passage hole (12) is inevitably increased. As shown in FIG. 4, even if a plate material having the same size is used, the heat transfer surface ( Since the vertical dimension of 13) is reduced, the diameter of the passage hole (12) is small.
The surface yield (ratio of heat transfer area to material area) is significantly lower than that of the plate (11). Therefore, in order to secure the required heat transfer area, it is necessary to increase the number of plates (11), which leads to an increase in cost.

Therefore, in order to solve such a problem, FIG.
As shown in FIG. 5, elliptical passage holes (12) having a larger opening size in the lateral direction (parallel to the upper and lower peripheral edges of the plate) are provided at the four corners of the plate (11) than in the vertical direction (parallel direction to both peripheral edges of the plate). ing. This is an oval passage hole (1
The vertical dimension of 2) is the same as the circular passage hole (12) shown in FIG. 3, but the large width dimension allows a large opening area without reducing the vertical dimension of the heat transfer surface (13). Can be secured. As a result, it is possible to cope with a large processing flow rate and prevent a decrease in surface yield. However, since the longitudinal center line of the oblong passage hole (12) is arranged laterally, the plate (1
A narrow portion (S) exists over a long span (P) in the plate peripheral portion (15) reaching the peripheral edge of (1). Therefore, the mechanical strength of the plate peripheral portion (15) is remarkably reduced, causing damage in handling the plate (11), and when a large internal pressure is applied to the plate (11), a long span (P ), There is a problem that the narrow portion (S) of the plate peripheral portion (15) existing over the entire area is deformed and the sealing performance is degraded.

An object of the present invention is to improve the strength of the peripheral portion of the plate and the yield of the transmission surface at the same time.

[0007]

In order to achieve the above-mentioned object, the present invention provides an oval shape in which the planar shape of the passage holes provided at the four corners of the plate has a larger opening dimension in the horizontal direction than in the vertical direction. It has a substantially oval shape, and its longitudinal center line is arranged so as to rotate at an arbitrary angle with respect to the lateral direction.

According to the present invention, the planar shape of the passage holes provided at the four corners of the plate is made to be an oval or a substantially oval having a larger opening dimension in the lateral direction than in the longitudinal direction, and the longitudinal center line is Since it is rotated at an arbitrary angle with respect to the lateral direction, the transfer surface yield can be greatly improved while ensuring a large processing flow rate. It is possible to reduce the narrow portion of the peripheral edge of the plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a plate heat exchanger of the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 shows a plate (1) used in the plate heat exchanger of the present invention. This plate (1) is provided with passage holes (2) serving as liquid inlets and outlets at four corners of a rectangular metal plate, and the passage hole (2) has a planar shape having a larger opening dimension in the horizontal direction than in the vertical direction. It has a circular shape, and the center line of its length is the upper and left passage holes (2).
(2) slopes down from the center of the plate (1) toward both sides, and the lower left and right passage holes (2) and (2) slope down from both sides of the plate (1) toward the center. It is arranged by rotating at an arbitrary angle with respect to the lateral direction so as to descend. In the middle of the plate (1), a heat transfer surface (3) having an uneven shape is provided, and the passage holes (2) above and below one side are provided.
(2) is connected to the heat transfer surface (3), and heat resistance of synthetic rubber or the like is set so as to doubly block the upper and lower passage holes (2) and (2) from the heat transfer surface (3). The gasket (4) made of the elastic material is attached.

As described above, the planar shape of the passage holes (2) provided at the four corners of the plate (1) is an elliptical shape having a larger opening size in the horizontal direction than in the vertical direction. It is possible to secure a surface transmission yield almost equal to That is, in order to secure a large processing flow rate, the diameter of the passage hole (12) is designed to be large at the sacrifice of the transmission surface yield.
As compared with the conventional example shown in (1), the surface treatment yield can be significantly improved while securing the same processing flow rate.

Further, by arranging the passage hole (2) having an elliptical plane shape by rotating the longitudinal center line at an arbitrary angle with respect to the lateral direction, there is a problem in the conventional example shown in FIG. It is possible to reduce the narrow portion (S) of the plate peripheral edge portion (5) existing over the long span (P), which improves the mechanical strength of the plate peripheral edge portion (5) and A structure that does not deform even under a large internal pressure can be provided.

Further, since the cross-sectional wetting length (L) of the passage hole (2) toward the center of the plate (1) is larger than that of the conventional example shown in FIG. 5, the liquid is in the center of the plate (1). It becomes easier to flow to the part, and this reduces uneven flow and improves heat transfer performance.

FIG. 2 shows another embodiment of the present invention, in which the longitudinal center of the passage hole (2), which is provided at the four corners of the plate (1) and has an elliptical planar shape for the inlet and outlet of the liquid. The line is in the opposite direction to the embodiment shown in FIG. 1, that is, the upper and left passage holes (2) (2) descend from both sides of the plate (1) toward the center, and The lower left and right passage holes (2) (2) are rotated at an arbitrary angle with respect to the lateral direction so as to descend from the central portion of the plate (1) toward both sides. It has the same effect of improving the heat transfer yield and mechanical strength as the embodiment shown.

In the above embodiment, the passage hole (2) is used.
Although the planar shape of No. 2 has been described as an elliptical shape, the planar shape of the passage hole (2) may be approximately an elliptic shape.

[0016]

As described above, according to the present invention,
The planar shape of the passage holes provided at the four corners of the plate should be an ellipse or an approximately ellipse with a larger opening dimension in the lateral direction than in the vertical direction, and its longitudinal centerline should be at an arbitrary angle with respect to the lateral direction. Since they are placed in rotation, the transfer surface yield can be significantly improved while ensuring a large processing flow rate, and the narrow portion of the plate peripheral edge from the edge of the passage hole to the peripheral edge of the plate can be reduced. This has an excellent effect that the mechanical strength of the peripheral portion of the plate is improved and the structure does not deform even with a large internal pressure.

Also, since the cross-sectional wetting length of the passage hole toward the central portion of the plate is large, the liquid easily flows into the central portion of the plate, uneven flow is reduced, and heat transfer performance is improved. Have an effect.

[Brief description of drawings]

FIG. 1 is a plan view showing a plate of a plate heat exchanger according to an embodiment of the present invention.

FIG. 2 is a plan view showing a plate of a plate heat exchanger according to another embodiment of the present invention.

FIG. 3 is a plan view showing a plate of a conventional plate heat exchanger.

FIG. 4 is a plan view showing a plate of a conventional plate heat exchanger.

FIG. 5 is a plan view showing a plate of a conventional plate heat exchanger.

[Explanation of symbols]

 1 Plate 2 Passage Hole 3 Heat Transfer Surface 4 Gasket 5 Plate Perimeter L Cross Section Wetting Length

Claims (1)

[Claims] 1. A plate heat exchanger comprising a stack of a plurality of plates each having a passage hole serving as a liquid inlet / outlet at the four corners, wherein the passage holes provided at the four corners of the plate have a planar shape more than that in the vertical direction. A plate type characterized by being an oval or a substantially oval having a large opening size in the lateral direction, in which the longitudinal center line of the passage hole is arranged to rotate at an arbitrary angle with respect to the lateral direction. Heat exchanger.