JP2000337784A - Plate heat exchanger for three liquids - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the kinds of the parts, reduce the sizes of the heat exchanger and parts, and make the handling of a heat exchanger easier, by separately providing a pair of openings which are connected to the entrance and exit of the flow passage of a third liquid near both short sides of a heat transfer plate. SOLUTION: A high-temperature first fluid (solid line) getting in the plate type heat exchanger unit B from a socket 17a enters another plate type heat exchanger unit A through the inside of the unit B and is sent to external equipment from a socket 7a. A second fluid (broken line) getting in the unit A from a socket 7b passes through the inside of the unit A and is sent to the external equipment from a socket 7d. In addition, a third fluid (two-dot chain line) getting in the plate type heat changer unit B from a socket 17d passes through the inside of the unit B and is sent to the external equipment from a socket 17b. While the first to third fluids make the above-mentioned movement, heat exchange takes place between the first and second fluids and between the first and third fluids.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate type heat exchanger, and more particularly, to heat exchange between a first fluid and a second fluid and between the first fluid and a third fluid. The present invention relates to a three-liquid heat exchanger.

[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.

On the other hand, for example, in an air conditioner, there is an air conditioner in which two outdoor units having different temperatures are simultaneously adjusted in temperature. In such an apparatus, for example, the first fluid having a high temperature is used as a fluid from a heat source, and heat is first exchanged between the first fluid and the second fluid, and then the first fluid having a slightly lowered temperature is exchanged with the first fluid. Exchange heat with the third fluid. Thus, the second fluid can be heated to a high temperature and the third fluid can be heated to an intermediate temperature for use in air conditioning of each room.

[0004] The heat exchange may be performed using two different heat exchangers. However, if the plate heat exchanger is used, the heat exchange can be performed by one heat exchanger. As described above, for example, in the case of exchanging heat between the first fluid and the second fluid having a high temperature, and then exchanging heat between the first fluid and the third fluid whose temperatures are slightly lowered, The second fluid must exchange heat in the first half of the flow path of the first fluid, and the third fluid must exchange heat in the second half of the flow path of the first fluid. A heat transfer plate divided at an intermediate portion so that the fluid does not intersect, and a heat transfer plate through which the first fluid flows over its entire length are prepared, and these are alternately stacked.

[0005]

However, the use of a plurality of types of heat transfer plates has the problem of increasing the types of parts and the number of molds for molding. In addition, since a certain flow path length is required for each fluid to perform desired heat exchange in the plate heat exchanger having the above structure, the heat exchanger is enlarged in the extending direction of the flow path. In addition, the size of the heat transfer plate becomes large, and its processing, management, transportation, and handling in assembling the exchanger tend to be troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and reduces the number of types of parts of the three-liquid plate heat exchanger, downsizes the heat exchanger and parts, and handles the heat exchanger. It is intended to be simple.

[0007]

According to the present invention, in order to achieve the above object, heat is applied between a first fluid and a second fluid and between the first fluid and a third fluid. In order to perform exchange, a plurality of substantially rectangular heat transfer plates are stacked so as to secure a plurality of first to third fluid passages therebetween, and different fluids are supplied to the adjacent passages. A three-fluid plate heat exchanger having six openings formed in each of said heat transfer plates so as to flow the same fluid and to communicate the flow paths for flowing the same fluid, wherein the first fluid flow path A pair of openings are provided near one short side of the heat transfer plate to be connected to the inlet and the outlet thereof, and the pair of openings of the heat transfer plate of the intermediate layer are closed to close the pair of openings. The flow passage is divided into two, and all of the above-mentioned heat transfer plates are provided at openings provided near the other short side of the heat transfer plate. Since the one fluid flow path is in communication, a long flow path that is folded in the stacking direction of the heat transfer plate is formed, and the first fluid and the second fluid before being folded exchange heat with each other. The second fluid flow path is formed, and a pair of openings connected to the inlet and the outlet thereof are provided separately in the vicinity of one and the other short sides of the heat transfer plate, and the first heat-transfer plate is folded back. The third fluid flow path is formed such that the fluid of the third fluid exchanges heat with the third fluid, and a pair of openings connected to the inlet and the outlet of the third fluid passage are formed on one and other short sides of the heat transfer plate. Provided is a three-liquid plate heat exchanger, which is provided near and separated from the heat exchanger.

According to this, the first fluid has a structure similar to that of a structure in which long flow paths are folded and overlapped, and the first fluid is subjected to heat exchange with different fluids before and after the folding. As a result, one type of heat transfer plate can be combined and configured, and the structure of the heat exchanger and its components are simple and the size is reduced.

[0009]

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 superimposed back to back in the thickness direction (lamination direction) of a heat transfer plate described later. The entered high temperature first fluid (solid line) passes through the inside thereof and further enters the plate heat exchange unit A, passes through the plate heat exchange unit A, exits the socket 7a, and is sent to external equipment (not shown). It has become. Also,
A second fluid (broken line) which enters the plate-type heat exchange unit A from a socket 7b described later passes through the inside thereof, exits from the socket 7d, and is sent to an external device (not shown). Furthermore, a third fluid (two-dot chain line) entered from a socket 17d described later in the plate heat exchange unit B
Pass through the inside of the socket 17b and are sent to an external device (not shown). Meanwhile the first
Heat is exchanged between the first fluid and the second fluid and between the first fluid and the third 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, for example, a thin stainless steel plate having a substantially rectangular shape. The hot plate 1a will be described as a representative.

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

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 laminating 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, FIG. 3A shows one of the openings 2a and 2b.
For example, five heat transfer plates 1a, 1b, 1c, 1
The lamination state of d · 1e is shown. The opening 2a has a first fluid,
Each of the openings 2a and 2
b communicate with each other in the stacking direction. Also, the opening 2a
· Each heat transfer plate 1a, 1b, 1c, 1d such that the level relationship of the step in the portion provided with 2b is switched between left and right in the figure.
Since 1e is laminated, in the laminated state, 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, the rooms 4a and 4b communicating with the openings 2c and 2d at the point symmetric positions alternately through the parallel grooves 3 between the heat transfer plates are defined by the spaced portions. Have been.

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 adhered to the lower surface of the lowermost heat transfer plate 1a of the plate 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, and the top plate 6 corresponds to the holes 6a and the openings 2b forming the first fluid outlet at positions corresponding to the openings 2a. A hole 6b serving as a second fluid inlet is opened at the position, and sockets 7a and 7b for connecting external devices are respectively attached. As shown in FIG. 3B, a hole 6d serving as a second fluid outlet is formed in the top plate 6 at a position corresponding to the opening 2d, and a socket 7d for connecting an external device is attached. .

The plate type heat exchange unit B has the same internal structure as the plate type heat exchange unit A, except that the bottom plate 5 is shared with the plate type heat exchange unit A, and the hole direction is different. That is, as shown in FIG. 3A, the top plate 16 attached to the lower surface of the lowermost heat transfer plate 11e has a hole 16a forming the first fluid inlet and an opening at a position corresponding to the opening 12a. Third at the position corresponding to 12b
A hole 16b serving as a fluid outlet is opened, and sockets 17a and 17b for connecting external devices are respectively attached.
Further, as shown in FIG.
A hole 16d serving as a third fluid inlet is opened at a position corresponding to 2d, and a socket 17d for connecting an external device is attached. Furthermore, the opening 2c and the opening 1 of the common bottom plate 5
A hole 5c is formed at a position corresponding to the opening 2c.
The room 4a and the room 14a communicate with each other via the opening 12c.

Socket 1 in plate type heat exchange unit B
High temperature first fluid (solid line) entering from room 7a
Through the opening 12c and the opening 2c, enters the plate-type heat exchange unit A, passes through the room 4a of the plate-type heat exchange unit A, exits the socket 7a through the opening 2a, and is sent to an external device (not shown). It has become. The plate type heat exchange unit A has a socket 7b.
The second fluid (broken line) that has entered through the chamber 4b passes through the opening 2d, exits the socket 7d, and is sent to an external device (not shown). In the meantime, heat exchange is performed between the first fluid and the second fluid via each heat transfer plate. At the same time, the third fluid (two-dot chain line) that has entered the plate-type heat exchange unit B from the socket 17d passes through the room 14b, exits the socket 17b through the opening 12b, and is sent to an external device (not shown). I have. In the meantime, heat exchange is performed between the first fluid and the third fluid via each heat transfer plate.

[0021]

As described above, according to the present invention, an opening connected to the inlet and outlet of the first fluid flow path is provided near one short side of the heat transfer plate, and this opening is closed by the intermediate layer. By connecting all the first fluid passages with the openings provided in the vicinity of the other short side of the heat transfer plate, the long first fluid passages are folded back in the stacking direction of the heat transfer plates. And a second fluid flow path is formed so that the first fluid and the second fluid before the return exchange heat with each other, and the first fluid and the third fluid after the return return to heat. By forming the third fluid flow passage so as to be exchanged, a three-liquid plate heat exchanger can be constituted by only one kind of small heat transfer plate, the number of parts is reduced, and the heat exchanger is compact. And the components can be downsized.

[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.

[Explanation of symbols]

 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, 7d Socket 11a to 11e Heat transfer plate 12a, 12b, 12c, 12d Opening 14a, 14b Room 16 Top plate 17a / 17b / 17d Socket A, B Plate heat exchange unit

Claims (1)

[Claims] 1. A plurality of first to third fluids interposed between a first fluid and a second fluid and between the first fluid and a third fluid for heat exchange. A plurality of substantially rectangular heat transfer plates are stacked so that a flow path can be secured, and different fluids are caused to flow in the flow paths adjacent to each other, and the flow paths for flowing the same fluid are communicated with each other. A three-liquid plate heat exchanger having six openings formed in each heat transfer plate, wherein the pair of openings of the first fluid flow path is connected to an inlet and an outlet of the heat transfer plate. The first fluid flow path is provided near one short side of the plate, and the first fluid flow path is divided into two by closing the pair of openings of the heat transfer plate of the intermediate layer, and the other of the heat transfer plate All of the first fluid flow paths are communicated with each other at openings provided near the short sides, so that the heat transfer plates are stacked. A long flow path is formed, and the second fluid flow path is formed so as to exchange heat between the first fluid and the second fluid before being folded, and is connected to an inlet and an outlet thereof. A pair of openings are provided in the vicinity of one and the other short sides of the heat transfer plate and are spaced apart from each other, and the third fluid is heat-exchanged between the first fluid and the third fluid after being folded. A three-liquid plate type wherein a pair of openings connected to an inlet and an outlet of the fluid passage are formed and provided near one and the other short sides of the heat transfer plate. Heat exchanger.