JP3443610B2 - 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 using a plate having a horizontal ridge-shaped heat transfer surface.

[0002]

2. Description of the Related Art Generally, a plate type heat exchanger has a plurality of plates laminated with a gasket interposed therebetween to form a plurality of medium passages between the plates, and the plurality of medium passages are different in heat exchange. The heat exchange media are alternately flowed to exchange heat between the two heat exchange media via a plate.

In such a plate heat exchanger, for example, a plate (1) as shown in FIG. 3 is used. This plate (1) is formed in a rectangular shape,
It has a heat transfer surface (2) in the center, and holes (3a) (3b) (3c) (3d) serving as inlets and outlets of the heat exchange medium are formed at four corners. Further, the plate (1) has a periphery of the heat transfer surface (2) and holes (3a) (3b) (3c).
A gasket groove (4) is formed in a portion surrounding the periphery of (3d), and the heat transfer surface (2) and a pair of upper and lower holes (3a) (3b) are communicated with the gasket groove (4). A gasket (5) is attached so as to block the other pair of upper and lower holes (3c) (3d).

As shown in FIG. 4, the heat transfer surface (2) of the plate (1) has a large number of horizontal ridges (6) arranged in parallel in order to improve heat transfer performance and plate strength. Is formed in a horizontal ridge shape in which trapezoidal cross-section irregularities are alternately arranged and adjacent plates are formed by vertical ridges (7) formed at arbitrary positions between the horizontal ridges (6) and (6). The space between the plates (1) and (1 ') is maintained by supporting the bottom surface between the horizontal ridges (6') and (6 ') of (1').

[0005]

By the way, the plate (1) having the horizontal ridge-shaped heat transfer surface (2) in which a large number of horizontal ridges (6) are arranged in parallel is, as described above, a horizontal ridge ( 6)
By supporting the bottom surface between the horizontal ridges (6 ') (6') of the adjacent plates (1 ') by the vertical ridges (7) formed at arbitrary positions between the plates (1) (1'). ) I try to keep the space between them.

However, a plate that supports the bottom surface between the horizontal ridges (6 ') (6') of the adjacent plates (1) by the vertical ridges (7) formed at arbitrary positions between the horizontal ridges (6) (6). At the mutual support points (8), when a fluid having a scale property flows, the scale adheres to the gap between the support points (8), and also at the time of cleaning with a chemical solution, etc. The adhered scale cannot be removed sufficiently. Therefore, in food applications, the scale remaining after washing becomes a breeding bed for miscellaneous bacteria, which is a sanitary problem.

Further, in the case of a fluid having a strong corrosive property for general use, there is a problem that a large amount of scale adheres to the gap portion of the support point (8) to induce crevice corrosion of metal.

The cause of these problems is shown in FIG.
Compared to the flow channel without the support points (8) as shown in (b), the flow channel with the support points (8) as shown in FIG. This is because the flow velocity becomes slow due to blockage, and at this low flow velocity, the scale easily adheres to the gap between the supporting points (8) and it is difficult to remove the scale adhering to the supporting points (8) even during cleaning.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a plate heat exchanger that suppresses adhesion of scales at support points between plates and promotes a cleaning effect. To do.

[0010]

In order to achieve the above-mentioned object, the present invention laminates a plurality of plates having a heat transfer surface in which a large number of horizontal ridges are arranged in parallel, and places them at arbitrary positions between the horizontal ridges. In a plate heat exchanger that maintains the space between the plates by supporting the bottom surface between the horizontal ridges of the adjacent plates with the formed vertical ridges, the lateral side or the lateral side adjacent to the support point between the plates One of the vertical and vertical extension lines is formed in a vertical groove structure that is substantially along the fluid flow.

[0011]

[Function] Since a vertical groove structure is formed along the lateral side or the lateral extension line adjacent to the supporting point between the plates, the flow path having a high flow velocity is formed in the vertical groove structure portion. As a result, this fast flow is adjacent to the support points between the plates, so that the fast flow can separate scales that attach to the support points between the plates.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Each embodiment of the plate heat exchanger according to the present invention will be described below with reference to FIGS.
The same members or parts as those shown in FIGS. 3 and 4 are designated by the same reference numerals, and a duplicate description will be omitted.

FIG. 1 shows a first embodiment of the present invention,
By forming a vertical groove (9) longitudinally crossing the horizontal ridge (6) adjacent to the vertical ridge (7) formed at an arbitrary position between the horizontal ridges (6) (6) of the plate (1) , A lateral side portion adjacent to a supporting point (8) with an adjacent plate (1 ′) is formed in a vertical groove structure that is substantially along the fluid flow.

In the plate heat exchanger of this embodiment, the lateral side portion adjacent to the support point (8) between the plates (1) and (1 ′) is formed by the vertical groove (9), as shown in FIG. As shown in FIG. 2, since the vertical groove structure is formed along the flow of the fluid, the vertical groove structure portion has another bent channel as shown in FIG. 1 (c), or as shown in FIG. 1 (d). Since the pressure loss of the fluid is smaller than that of the flow path having the support points (8), a large amount of a high-speed flow can be obtained. Since this large amount of high-speed flow is adjacent to the support point (8) between the plates (1) and (1 ′), the high-speed flow causes the plate (1) to move.
The scale that tends to adhere to the support points (8) between (1 ′) is separated by the physical force of the flow, and the scale adhesion to the support points (8) is suppressed. In addition, this fast flow is due to the support point (8) between the plates (1) and (1 ') even when cleaning the chemical solution.
It has the effect of exfoliating the scale that adheres to and grows, and a high cleaning effect can be obtained.

FIG. 2 shows a second embodiment of the present invention,
Longitudinal ridges (along the ridges (6) (6) of the plate (1)) adjacent to the vertical ridges (7) formed at arbitrary positions between the lateral ridges (6) and (6) facing each other on the lateral extension line. 7 ') is formed to form a flute structure along the horizontal flow line on the lateral extension line adjacent to the support point (8) of the plate (1) (1'). The function and effect are the same as those of the first embodiment shown in FIG.

In the above first and second embodiments,
Adjacent plates have different horizontal ridges (6) 2
Different types of plates may be used, or the same plate may be rotated or inverted and used in combination.

Further, in the first and second embodiments,
Although the vertical groove structure is formed adjacent to only one side of the supporting point (8), the vertical groove (9) may be provided on both sides of the supporting point (8).

[0018]

As described above, according to the present invention, the lateral groove adjacent to the supporting points between the plates or the lateral lateral vertical extension line is formed into a flute structure that is substantially along the fluid flow, Since the fluid flow in this flute structure is made faster, the scale that adheres to the support points between the plates can be separated by this fast flow, and the adhesion of scale at the support points between the plates can be suppressed and the cleaning effect can be improved. Can be encouraged.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a plate heat exchanger of the present invention, (a) is a plan view of a main part of a plate,
(B), (c), (d), and (e) are bb line, cc line, and dd line of (a) in a state where adjacent plates are laminated.
It is sectional drawing in the line and ee line.

2A and 2B are drawings showing a second embodiment of the plate heat exchanger of the present invention, where FIG. 2A is a plan view of a main part of one plate, FIG. 2B is a plan view of a main part of an adjacent plate, c) and (d) are cc line and d in (a) and (b) in the state where one plate and an adjacent plate are laminated.
It is sectional drawing in the -d line.

FIG. 3 is a plan view of a plate used in the plate heat exchanger.

FIG. 4 is a view showing a conventional plate heat exchanger, in which (a) is a plan view of an essential part of the plate, and (b), (c) and (d) show (a) a state in which adjacent plates are laminated. )
3 is a cross-sectional view taken along line bb, cc, and dd of FIG.

[Explanation of symbols]

1 plate 1'adjacent plates 2 Heat transfer surface 6 horizontal ridges 6'side ridge 7 vertical ridges 7'longitudinal ridge 8 support points 9 flutes

Claims (3)

(57) [Claims] 1. A plurality of plates having a heat transfer surface in which a large number of horizontal ridges are arranged in parallel are laminated, and a vertical ridge formed at an arbitrary position between the horizontal ridges forms a bottom face between the horizontal ridges of adjacent plates. In a plate heat exchanger that maintains the distance between the plates by supporting them, in the lateral direction that is adjacent to the supporting point between the plates or on the vertical extension line of the lateral side that is generally along the fluid flow. A plate heat exchanger having a groove structure. 2. A longitudinal groove that cuts the horizontal ridges is formed on the lateral side adjacent to the longitudinal ridges of the plates, so that the lateral side adjacent to the supporting points between the plates is aligned with the fluid flow. The plate heat exchanger according to claim 1, wherein the plate heat exchanger has a groove structure. 3. A vertical lateral extension adjacent to a supporting point between the plates by forming vertical ridges on the adjacent plates facing each other on a lateral lateral extension line adjacent to the vertical ridges of the plates. 2. The plate heat exchanger according to claim 1, wherein a flute structure is formed on the line along the flow of the fluid.