JP2000356483A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make convenient the handling of a heat exchanger by coupling the inlet and outlet of plate heat exchanger units being stacked in the thickness direction of a heat transfer plate such that the channels of the same fluid are arrange in series thereby reducing the size of the heat exchanger and the components thereof. SOLUTION: Opposite end parts are formed stepwise in the thickness direction of a heat transfer plate 1a between the openings 2a, 2b and 2c, 2d thereof, the parts at point symmetric position are formed at same level as a whole and parallel grooves 3 are made obliquely in the central part. Furthermore, parallel grooves 3 are made in an intermediate second heat transfer plate 1b contiguous to the parallel grooves 3 in the first heat transfer plate 1a to intersect each other when viewed from the upper surface. When high temperature fluid and low temperature fluid are fed between the openings 2c, 2a and 2d, 2b, as shown by a solid line and an imaginary line, through each channel between a plurality of heat transfer plates 1a, 1b and 1c heat can be exchanged between the fluids flowing on the opposite sides through an intermediate heat transfer plate 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat exchanger,
In particular, the present invention relates to a heat exchanger including a plate-type heat exchange unit that stacks a plurality of heat transfer plates and secures a flow path in a gap therebetween.

[0002]

2. Description of the Related Art Conventionally, in order to conduct heat transfer between different fluids, a plurality of heat transfer plates are stacked, and a high-temperature fluid and a low-temperature fluid are caused to flow through a gap therebetween to perform heat exchange. There is an exchanger. Not only such a plate heat exchanger, it is desirable that the heat exchanger efficiently exchange heat,
For example, as shown in JP-A-10-259997, a corrugated heat transfer plate provided with a plurality of parallel grooves having a corrugated cross section as a flow path is formed, and a plurality of the corrugated heat transfer plates are formed. There is a configuration in which peaks and valleys of waveforms in adjacent ones intersect each other when stacked. In this way, the corrugated peaks and valleys are stacked so as to intersect using the corrugated heat transfer plate, so that the flow of the fluid is turbulent to promote heat exchange and the differential pressure between the fluids This is to increase the rigidity of the heat transfer plate so as to withstand the heat.

[0003]

However, even in the plate heat exchanger having the above structure, a certain flow path length is required for performing the desired heat exchange. Not only will the size increase in the direction in which the road extends,
The size of the heat transfer plate has increased, and its handling in processing, management, transportation, and assembly of the exchanger has tended to be troublesome.

The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to reduce the size of a heat exchanger and parts and to simplify the handling thereof.

[0005]

According to the present invention, in order to achieve the above-mentioned object, a plurality of heat transfer plates are laminated so that a flow path can be secured therebetween, and the heat flow plates adjacent to each other are provided in the flow paths adjacent to each other. A plate-type heat exchange unit having a plurality of openings formed in each of the heat transfer plates so as to allow different fluids to flow and to communicate flow paths for flowing the same fluid, and to connect inlets and outlets of the respective fluids; In the heat exchanger, a plurality of the plate-type heat exchange units are overlapped in the thickness direction of the heat transfer plate, and the inlet and the outlet of each plate-type heat exchange unit are arranged so that the same fluid flows through the flow passages. Are connected in series.

According to this, the same operation as that of the structure in which the heat exchanger having the long flow path is bent and stacked can be obtained. In addition, the structure of the heat exchanger and its components are simple, and the size is reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to specific examples shown in the accompanying drawings.

FIG. 1 is an exploded perspective view showing the appearance of a heat exchanger to which the present invention is applied. In this heat exchanger, a pair of plate-type heat exchange units A and B are overlapped in the thickness direction (stacking direction) of a heat transfer plate described later, and are inserted into the plate-type heat exchange unit B from a socket 17c described later. The high-temperature fluid (solid line) passes through the inside thereof and further enters the plate-type heat exchange unit A, passes through the plate-type heat exchange unit A, exits the socket 7c through the opening 2c, and is sent to external equipment (not shown). Has become. Further, a low-temperature fluid (broken line) entered from a socket 7d described later in the plate-type heat exchange unit A passes through the inside thereof, further enters the plate-type heat exchange unit B, passes through the plate-type heat exchange unit B, and passes through the opening 12d. Through the socket 17d, the data is sent to an external device (not shown). Meanwhile, heat exchange is performed between the high temperature fluid and the low temperature fluid.

Since the internal structure of the plate type heat exchange units A and B is the same, one plate type heat exchange unit A will be described below. FIG. 2 is a perspective view illustrating a procedure for stacking the heat transfer plates of the plate-type heat exchange unit A, and shows a part (three sheets in the figure) of the heat transfer plates to be stacked. In the present plate-type heat exchange unit, a plurality of corrugated heat transfer plates 1a, 1b, and 1c are stacked as shown in the figure.
High and low temperature fluids are allowed to flow through the respective spaces (flow paths) defined therebetween as shown by the solid and imaginary arrows in the figure, and both sides thereof are interposed through the intermediate heat transfer plate 1b in the figure. Heat is exchanged between the fluids flowing through the heat transfer plates, and the number of heat transfer plates to be stacked is arbitrary depending on specifications such as a flow rate.

Each of the heat transfer plates 1a, 1b, 1c is formed by pressing a thin stainless steel plate, for example.
Unless otherwise indicated, one heat transfer plate 1a will be described as a representative in the same shape portion.

As described above, a fluid flows between the heat transfer plates 1 superposed on each other, and two openings 2a, 2b and 2c, 2d are provided at both ends in the longitudinal direction of the heat transfer plate 1a as entrances and exits. Is provided. Both ends of the heat transfer plate 1a are located between the opening 2a and the opening 2b and between the opening 2c and the opening 2d.
The heat transfer plate 1a is formed so as to be stepped in the thickness direction of the heat transfer plate 1a, and the portions of the heat transfer plate 1a at the point symmetric positions are formed at the same level. And opening 2
The high-temperature fluid flows between c and the opening 2a, and the low-temperature fluid flows between the openings 2d and 2b.

In the center of the heat transfer plate 1a, parallel grooves 3 appearing on the front and back surfaces of the heat transfer plate 1a are provided obliquely with respect to the main axis of the heat transfer plate 1a. The middle second adjoining the parallel groove 3 of the lower first heat transfer plate 1a in the figure
The parallel grooves 3 of the heat transfer plate 1b are formed so as to intersect with each other when viewed from above. The third heat transfer plate 1c may be the same as the first heat transfer plate 1c. Therefore, even if the second and third heat transfer plates 1b and 1c are provided, the parallel grooves 3 are formed.
Intersect. In this way, a predetermined number of heat transfer plates are stacked so as to intersect each of the parallel grooves 3, and a portion where the fluid of the heat exchanger flows is formed.

On the outer periphery of each of the heat transfer plates 1a, 1b, and 1c, there is provided a peripheral wall which is bent so as to rise obliquely in the stacking direction. The peripheral walls of the hot plates 1a, 1b, 1c are in a sealed state. Further, in order to prevent the adjacent heat transfer plates 1a and 1b (1b and 1c) from separating from each other due to the fluid pressure and expanding the flow path, the peak of the waveform of the first heat transfer plate 1a and the second heat transfer plate Each intersection 3 with the trough of the waveform of the plate 1b (x in FIG.
Mark). This is the same between the second and third heat transfer plates 1b and 1c, and also between the other stacked heat transfer plates.

Next, referring to FIG.
For example, five heat transfer plates 1a, 1b, and 1c in the portion 2b
-Indicates the state of lamination of 1d and 1e. One pair of openings 2
The openings 2a and 2b communicate with each other in the stacking direction such that a high-temperature fluid flows through the opening a and a low-temperature fluid flows through the other opening 2b. In addition, since the heat transfer plates 1a, 1b, 1c, 1d, and 1e are stacked so that the level relationship of the step in the portion where the pair of openings 2a and 2b are provided is switched between left and right in the figure, The state in which the surfaces provided with the openings 2a and 2b are in close contact or at intervals is alternately repeated. As shown in the figure, each of the rooms 4 alternately communicates with the openings 2c and 2d at the point symmetric positions via the parallel grooves 3 between the heat transfer plates by the portions in the spaced state.
a.4b are defined.

In each opening 2a, each room 4a, 4b
In order that the same fluid flows, the peripheral portions of the openings 2a repeat a state of being in close contact with and spaced from each other in the stacking direction, and the peripheral edges of the openings 2a corresponding to the close contact state. The parts are brazed.

A bottom plate 5 is attached to the lower surface of the lowermost heat transfer plate 1a of the plate type heat exchange unit A, and the openings 2a and 2b of the lowermost heat transfer plate are closed by the bottom plate 5. A top plate 6 is adhered to the upper surface of the uppermost heat transfer plate 1e. The top plate 6 has a hole forming a low-temperature fluid outlet at a position corresponding to the opening 2b and a high-temperature fluid at a position corresponding to the opening 2a. Holes are formed at the entrance, each with a socket 7 for connection.
b.7a is attached. As shown in FIG. 3B, the bottom plate 5 has a hole forming a low-temperature fluid inlet at a position corresponding to the opening 2d and a hole forming a low-temperature fluid outlet at a position corresponding to the opening 2c. Sockets 7d and 7c for connecting external devices are attached.

The plate type heat exchange unit B has the same internal structure as the plate type heat exchange unit A, but differs only in the direction of the opening. That is, as shown in FIG. 3A, the bottom plate 5 attached to the lower surface of the lowermost heat transfer plate 11a corresponds to the hole forming the high-temperature fluid outlet and the opening 12b at a position corresponding to the opening 12a. A hole forming a low-temperature fluid inlet is opened at the position, and sockets 7b and 7a for connection are respectively provided.
Through the opening 2b and the opening 2a. Also,
As shown in FIG. 3B, the top plate 6 attached to the upper surface of the lowermost heat transfer plate 11a has a hole corresponding to the opening 12d and a hole corresponding to the low-temperature fluid outlet and a position corresponding to the opening 12c. A hole forming a high-temperature fluid inlet is formed in each of the holes, and sockets 17d and 17c for connecting external devices are attached to the holes.

A spacer 18 is interposed between the plate type heat exchange unit A and the plate type heat exchange unit B, and a gap is secured between the heat exchange units together with the connecting sockets 7b and 7a. The heat exchange between the heat exchange units is prevented to improve the heat exchange efficiency.

Socket 1 in plate type heat exchange unit B
The high-temperature fluid (solid line) entering from 7c enters the plate-type heat exchange unit A through the inside through the opening 12a, the socket 7a and the opening 2a, passes through the plate-type heat exchange unit A, and through the opening 2c. It comes out of the socket 7c and is sent to an external device (not shown). Further, a low-temperature fluid (dashed line) that has entered the plate-type heat exchange unit A from the socket 7d enters the plate-type heat exchange unit B through the opening 2b, the socket 7b, and the opening 12b, and enters the plate-type heat exchange unit. It passes through the unit B, passes through the opening 12d, exits the socket 17d, and is sent to an external device (not shown). And
In the meantime, heat exchange is performed between the two fluids adjacent via each heat transfer plate.

[0020]

As described above, according to the present invention, a small heat transfer plate is laminated to form a plate-type heat exchange unit, and the plate-type heat exchange units are further overlapped so that the flow paths are in series. , The heat exchanger having a long flow path can be made compact, and its components can be downsized.
Further, by interposing a spacer between the stacked plate heat exchange units, heat exchange between the high temperature part and the low temperature part between the same fluids can be prevented, heat exchange loss is reduced, and temperature management becomes easy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a heat exchanger to which the present invention is applied.

FIG. 2 is a perspective view showing how to stack heat transfer plates of a plate heat exchanger constituting a heat exchanger to which the present invention is applied.

FIG. 3 (a) shows FIG. 1 showing the state of lamination of heat transfer plates,
FIG. 3B is a cross-sectional view of a main part as viewed along the line A-IIIA, and FIG. 3B is a cross-sectional view of the main part as viewed along the line IIIB-IIIB in FIG.

[Description of Signs] 1a to 1e Heat transfer plate 2a, 2b, 2c, 2d Opening 3 Parallel groove 4a, 4b Room 5 Bottom plate 6 Top plate 7a, 7b, 7c, 7d Socket 11a to 11e Heat transfer plate 12a, 12b, 12c・ 12d opening 17c ・ 17d socket 18 spacer A, B Plate heat exchange unit

Claims (2)

[Claims] 1. A plurality of heat transfer plates are stacked so that a flow path can be secured therebetween, and different fluids flow through the flow paths adjacent to each other, and the flow paths flowing the same fluid are communicated with each other. A heat exchanger having a plate heat exchange unit having a plurality of openings formed in each heat transfer plate to connect the inlet and outlet of each fluid, and a plurality of the plate heat exchange units, Heat exchange characterized by being overlapped in the thickness direction of the heat transfer plate, wherein the inlet and outlet of each plate heat exchange unit are connected such that flow paths for flowing the same fluid are in series. vessel. 2. The heat exchanger according to claim 1, wherein a spacer is interposed between each of the plate heat exchange units.