WO2000034729A1

WO2000034729A1 - Plate type heat exchanger for three fluids and method of manufacturing the heat exchanger

Info

Publication number: WO2000034729A1
Application number: PCT/JP1999/006864
Authority: WO
Inventors: Yasunari Furukawa; Norio Uedono; Naoyuki Inoue; Akiyoshi Suzuki; Kaoru Watanabe; Hidemitsu Hideshima
Original assignee: Ebara Corporation; Nhk Spring Co., Ltd.
Priority date: 1998-12-08
Filing date: 1999-12-08
Publication date: 2000-06-15
Also published as: JP3936088B2; JP2000171177A; EP1054225A4; CN1172158C; EP1054225B1; DE69936288D1; CN1290338A; EP1054225A1

Abstract

A plate type heat exchanger for exchanging heat between a first fluid and second and third fluids in that order, wherein the part of a laminated plate material body near its one end side in the plate material laminating direction is formed in a front stage heat exchange part (13A) in which first plate-to-plate fluid paths (f1) allowing a first fluid (La) to pass and second plate-to-plate fluid paths (f2) allowing a second fluid (Lc) to pass are positioned between plate materials alternately to each other in the plate material laminating direction, the part of the laminated plate material body near its other end side in the plate material laminating direction is formed in a rear stage heat exchange part (13B) in which first plate-to-plate fluid paths (f1) allowing a first fluid (La) to pass and third plate-to-plate fluid paths (f3) allowing the third fluid (Lb) to pass are positioned between the plate materials alternately to each other in the plate material laminating direction, and a crossover path (m) leading the first fluid passed through the first plate-to-plate fluid path of the pre-stage heat exchange part into the first plate-to-plate fluid paths of the rear-stage heat exchange part is provided.

Description

Description Plate-type heat exchanger for three fluids and method for producing the same

The present invention relates to a three-fluid plate heat exchanger, and more particularly, to a three-fluid plate heat exchanger for sequentially exchanging heat of a first fluid with a second fluid and a third fluid, and a method of manufacturing the same. About. Background art

Conventionally, in this type of heat exchanger, as shown in FIG. 6, in a plate laminate in which a large number of plate members 15 are laminated, a portion of the plate laminate near one end in the plate material longitudinal direction is a plate member 15. The first fluid path f 1 between the plates, which allows the first fluid a to pass between them, and the second fluid path f 2 between the plates, which allows the second fluid L c to pass between the plates 15. The first heat exchange section 13 A alternately located in the material laminating direction is referred to as a first heat exchange section 13 A. Subsequent to 1, the first fluid path f1 between the plates that allows the first fluid La to pass between the plate materials 15 and the third fluid path f1 that allows the third fluid Lb to pass between the plate materials 15 The rear heat exchange section 13B in which the fluid path f3 and the fluid path f3 are alternately located in the plate material laminating direction was used (see Japanese Patent Application Laid-Open No. Hei 9-196096).

That is, the first-stage heat exchange unit 13 A for exchanging the first fluid a with the second fluid L c, followed by the second-stage heat exchange unit 13 for exchanging the first fluid La with the third fluid L b B and the plate 15 were juxtaposed in the longitudinal direction to form an integrated structure.

However, in this conventional structure, the first heat exchange section 13 A and the second heat exchange section 13 Compared to B, which is composed of a separate plate heat exchanger, the whole can be considerably compacted. However, in recent years, with the demand for further downsizing of the equipment and further energy saving, it is still difficult. There was room for improvement. Disclosure of the invention

In view of this situation, the main problem of the present invention is to achieve a more compact structure by adopting a rational structure in integrating the front heat exchange section and the rear heat exchange section, and to reduce heat loss. (Heat loss).

(1) In the invention according to claim 1, since the first fluid is sequentially heat-exchanged with the second fluid and the third fluid,

In a plate material laminate in which a large number of plate materials are laminated, a portion of the plate material laminate closer to one end side in the plate material lamination direction is provided with a first fluid path between plates for allowing a first fluid to pass between the materials. A pre-stage heat exchange section in which plate-to-plate second fluid passages for passing a second fluid between the plate members are alternately positioned in the plate member stacking direction; and the other end of the plate member stack in the plate member stacking direction In the near portion, a first inter-plate fluid path for passing the first fluid between the plate members and a third inter-plate fluid path for passing the third fluid between the plate members are laminated. In the latter heat exchange section, which are alternately located in

And a first fluid transfer in which the first fluid that has passed in parallel through the first fluid passages in the plurality of plates in the pre-stage heat exchange unit flows into the first fluid passages between the plates in the post-stage heat exchange unit in parallel. The road is provided.

That is, according to this configuration, the first-stage heat exchange unit that exchanges heat with the first fluid and the second-stage heat exchange unit that subsequently exchanges heat with the third fluid in the plate material laminating direction. Since it adopts a form of side-by-side integration, the front heat exchange section and the rear heat exchange section are lined up in the direction Compared with the structure to be laminated, the length of the laminated plate material is reduced by half (the area is also reduced by half), and it is possible to form a three-dimensionally more integrated shape in the laminated plate material. The entire heat exchanger can be made more compact and more easy to install and handle, and halving the length of the plate (half the area) reduces heat shrinkage and thermal distortion. The response can be made easier, and the production of the heat exchanger itself can be made easier.

In addition, since the outer surface area of the plate laminate can be reduced by the above three-dimensional consolidation, the heat loss from the outer surface can be suppressed, thereby further improving the heat exchange in terms of energy saving. Can be a container.

(2) In the invention according to claim 2, the heat insulating layer through which the fluid does not pass between the sheets located at the boundary between the pre-stage heat exchange unit and the post-stage heat exchange unit in the laminated plate members To

According to this configuration, the heat exchange between the front heat exchange section and the rear heat exchange section having different temperature levels is prevented by the heat insulating layer, and the heat exchange between the two heat exchange sections is prevented. Heat loss (in short, heat loss due to heat exchange between the second fluid and the third fluid, which is not the object of the original heat exchange), can be suppressed. It is possible to make the heat exchanger more excellent in heat exchange property and more advantageous in energy saving.

In addition, since the heat insulating layer is formed at the boundary between the first heat exchange section and the second heat exchange section in a state where the original laminated structure in which a large number of plate materials are stacked is used, the formation of the heat insulating layer itself is facilitated. The heat exchanger can be easily and efficiently manufactured.

(3) In the invention according to claim 3, each of the three or more adjacent plate members located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit in the laminated plate members is fluidized. Insulation that does not pass through ^.

According to this configuration, in carrying out the above-described claim 2, 3 Since each of the above-mentioned adjacent plate materials is used as a heat insulation layer, the heat insulation effect is enhanced by increasing the heat insulation layer and increasing the thickness of the heat insulation layer as a whole, and increasing the heat insulation effect. The heat loss due to heat transfer between the heat exchanger and the subsequent heat exchanger can be more effectively suppressed.

In this configuration, when a plate material having a corrugated cross-sectional shape is laminated in a state where the peak portions of the waveform are brought into facing contact with each other, that is, when a laminated plate material structure is adopted (that is, through a joint portion of the waveform peak portion). In the case where heat transfer is anticipated), heat loss due to heat transfer between the upstream heat exchange section and the downstream heat exchange section is effectively suppressed by improving the heat insulation effect by multi-layering as described above. be able to.

(4) In the invention according to claim 4, between the plate materials located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit in the laminated plate materials, an airtight space in a vacuum state is provided, and The heat insulation layer is a vacuum heat insulation layer.

According to this configuration, in carrying out the invention according to claim 2 or 3, the heat insulating layer formed between the plate members is a vacuum heat insulating layer, so that the vacuum space has an extremely high heat insulating effect. With this, it is possible to more effectively suppress the heat loss due to heat transfer between the upstream heat exchange section and the downstream heat exchange section.o

In addition, with this configuration, since a heat insulating material is not required, forming the heat insulating layer using the original laminated structure of the plate material can further facilitate the formation of the heat insulating layer.

(5) In the invention according to claim 5, the first fluid transfer path is provided between the plurality of plates in the pre-stage heat exchange section in a state where the plate material is penetrated in the plate material laminating direction inside the plate material laminate. The first fluid passage and the first fluid passage between the plurality of plates in the post-stage heat exchange section are configured to extend.

According to this configuration, the first heat exchange section connects the first fluid passage to the second heat exchange section. The structure around the plate laminate is simplified compared to the structure in which the first fluid transfer path for transferring the first fluid to the first fluid path between the plates is formed outside the plate laminate by external piping. Thus, the entire heat exchanger can be made more compact.

In addition to this configuration, the first fluid introduction path that allows the first fluid to flow in parallel into the first fluid path between the plates in the pre-stage heat exchange section, The second fluid introduction passage through which the second fluid flows in parallel into the plurality of inter-plate second fluid passages in the section, and the second fluid that has passed through the plurality of inter-plate second fluid passages in the pre-stage heat exchange section A second fluid outlet path to be discharged, a third fluid introduction path through which the third fluid flows in parallel to the third fluid path between the plates in the rear heat exchange section, and a third fluid path between the plates in the rear heat exchange section A third fluid outlet for collecting and discharging the third fluid that has passed through the first fluid, and a first fluid outlet for collecting and discharging the first fluid that has passed through the multiple first fluid passages between the plates in the subsequent heat exchange section ) Is a state in which the plate material is penetrated in the plate material lamination direction inside the plate material laminate. , Taking a configuration in which span the corresponding plates the fluid path can be a structure around plate stack in the further simplified to achieve the compounding click bets of the entire heat exchanger more effectively.

(6) In the invention according to claim 6, in manufacturing the plate heat exchanger for three fluids according to the invention according to claim 4,

When a number of the laminated plate members are placed under vacuum and the adjacent plate members are solder-bonded to form the fluid paths between the plates, the adjacent plate materials are solder-bonded under the vacuum. In addition, a method is adopted in which a vacuum-tight airtight space serving as the vacuum heat insulating layer is simultaneously formed between the plate members located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit.

According to this method, so-called vacuum brazing is used to form vacuum insulation ^ at the same time as joining adjacent plate materials. After forming an airtight space between the plate members located at the boundary between the former heat exchange part and the latter heat exchange part by the method, and then extracting air from the airtight space to form a vacuum insulation layer, the vacuum The formation of the heat insulation layer itself can be made extremely easy, and the manufacture of the heat exchanger can be performed easily and efficiently. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of an absorption refrigerator.

FIG. 2 is a longitudinal sectional view of the heat exchanger.

FIG. 3 is a partial cross-sectional view of the heat exchanger.

FIG. 4 is a schematic perspective view of the heat exchanger.

FIG. 5 is a longitudinal sectional view of a heat exchanger showing another embodiment.

FIG. 6 is a schematic structural diagram of a heat exchanger showing a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION

Figure 1 shows the equipment configuration of an absorption refrigerator, 1 is a high-temperature regenerator, 2 is a low-temperature regenerator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, and the high-temperature regenerator 1 is a refrigerant. By heating the low-concentration absorption liquid La (for example, aqueous lithium bromide solution) having absorbed R (for example, water) by the high-temperature heater 6, the refrigerant R is evaporated and separated.

The medium-absorbent liquid Lb after the refrigerant R is separated by the high-temperature regenerator 1 is sent to the low-temperature regenerator 2 through the flow path r 1, and the refrigerant vapor R ′ generated in the high-temperature regenerator 1 is converted into the flow path r 2 to the low-temperature regenerator 7 in the low-temperature regenerator 2 as a heat source, whereby the low-temperature regenerator 2 uses the refrigerant vapor R 'generated in the high-temperature regenerator 1 to heat the medium-concentration absorbing liquid Lb. As a result, the refrigerant R is further evaporated and separated from the concentrated absorbent Lb.

Refrigerant vapor R 'generated in low-temperature regenerator 2 and heat source in low-temperature heater 7 The used refrigerant vapor R ′ is condensed by being cooled by the cooler 8 in the condenser 3, and the condensed refrigerant R (that is, liquid refrigerant) is sent to the evaporator 4 through the flow path r 3.

In the evaporator 4, the condensed refrigerant R sent from the condenser 3 is circulated by the refrigerant pump 9 A and sprayed to the interior heat exchanger 11 by the sprayer 10. It evaporates, and by taking the heat of vaporization at that time, the cooling fluid C (for example, water or brine) flowing through the interior heat exchanger 11 is cooled.

On the other hand, the high-concentration absorbent L c after separating the refrigerant R in the low-temperature regenerator 2 is sent to the absorber 5 through the channel r 4, and the high-concentration absorbent L sent from the low-temperature regenerator 2 in the absorber 5 By spraying c by the sprayer 12, the refrigerant vapor R ′ generated in the evaporator 4 is absorbed by the spray absorbing liquid Lc, thereby evaporating the sprayed refrigerant R at a low temperature in the evaporator 4. To form a low-pressure atmosphere.

Then, the low-concentration absorbent La after absorbing the refrigerant vapor R 'in the absorber 5 is returned to the high-temperature regenerator 1 through the flow path r5 by the solution pump 9B, and the refrigerant is returned from the low-concentration absorbent La again. Return to the step of separating R.

Reference numeral 13 denotes low-temperature, low-concentration absorbent La returned to high-temperature regenerator 1 and medium-temperature, high-concentration absorbent Lc sent from low-temperature regenerator 2 to absorber 5, and low-temperature regeneration from high-temperature regenerator 1. This is a heat recovery heat exchanger for sequentially exchanging heat with the high-temperature medium-concentration absorbing solution Lb sent to the vessel 2 to recover the retained heat of the high-concentration absorbing solution Lc and the medium-concentration absorbing solution Lb. In Fig. 1, the heat recovery heat exchanger 13 is shown only schematically to show the heat exchange order of the low concentration absorbent La for the high concentration absorbent Lc and the medium concentration absorbent Lb. However, this does not match the specific structure described later.

Reference numeral 14 indicates that the absorption of the refrigerant into the spray absorption liquid L c in the absorber 5 is half of the time. A cooler that removes generated heat of absorption, and supplies a cooling fluid W (for example, cooling water circulated between the cooling tower) to a cooler 14 in the absorber 5 and a cooler 8 in the condenser 3. I do.

Heat exchanger for heat recovery for exchanging heat between three fluids, low-concentration absorbent La, high-concentration absorbent Lc, and medium-concentration absorbent Lb (hereinafter referred to as first to third fluids in this order) 1 3 As shown in Fig. 2 to Fig. 4, plate material 15 having a corrugated cross-sectional shape excluding the vicinity of both ends and having holes p1 to p4 at the corners for forming lead-in / out paths is provided by: As shown in FIG. 3, a large number of corrugated peaks are formed in a state where they are opposed to each other, and as shown in FIG. 4, the portion of the plate material laminated body near one end in the plate material laminating direction is formed as shown in FIG. The first heat exchange section 13A for exchanging heat with the first fluid La with the second fluid Lc is provided. On the other hand, the portion of the sheet laminate near the other end in the plate stacking direction is the first heat exchange section 1A. A first heat exchange section 13B is provided, in which the first fluid La that has undergone heat exchange with the second fluid Lc at 3A is subsequently subjected to heat exchange with the third fluid Lb.

In the first-stage heat exchange section 13A, in the above-described laminated plate structure, the first fluid path f1 between the plates through which the first fluid La passes between the adjacent plate materials 15 and the adjacent plate material 15 The inter-plate second fluid path f 2 through which the second fluid c passes between them is alternately positioned in the plate material laminating direction, and during the passage of these inter-plate fluid paths f 1 and f 2, the plate material Heat is exchanged between the first fluid La and the second fluid Lc using 15 as a heat transfer wall.

Similarly, in the latter-stage heat exchange section 13B, in the above-described laminated plate structure, the first fluid path f1 that allows the first fluid La to pass between the adjacent plate materials 15 is adjacent to the first fluid path f1. The third inter-plate fluid path f 3 that allows the third fluid Lb to pass between the plate members 15 is alternately positioned in the plate lamination direction, and the inter-plate fluid paths f 1 and f 3 pass through. In the process, the first fluid La and the third fluid Lb exchange heat with the plate 15 as a heat transfer wall. As shown in Fig. 3, each of the inter-channel fluid paths f1 to f3 is subdivided into a large number in the plate width direction orthogonal to the fluid flow direction by a plate material laminated structure in which the peaks of the waveform face each other. As a result, a large heat transfer area is secured and high strength is obtained.

Both ends of each inter-plate fluid path f1 to f3 are formed into a flat plate shape with no corrugation near both ends of each plate material 15, thereby forming a part of the header for the flow path subdivided in the plate width direction. On the other hand, one of the holes P1 to p4 for forming the lead-in / out channel formed at the four corners of each plate material 15 is provided inside the plate material laminate at the former stage. To the one end of the first fluid path f 1 between each plate in the heat exchange section 13 A To the one end of the first fluid path f 1 between each plate in the rear heat exchange section 13 B The first fluid transfer path m is formed to extend between the first and second fluid paths f 2 and the third fluid path f 3 between the plates. By extending the neck d of the hole p 1 to the corresponding hole pi of the adjacent plate 15, the communication between the first fluid transfer path m and the second fluid path f 2 between the plates and the first fluid transfer path m Between boards 3 are cut off each of the communication between the fluid path f 3.

Note that in FIG. 2, the first fluid transfer path m and the respective outgoing / incoming paths i 1, ol, i 2, ο 2, ο 2, i 3, and ο 3, which will be described later, are indicated by overlapping portions of these flow paths. The longitudinal section of the heat exchanger 13 is shown in a state where is expanded.

Out of the four holes ρ1 to ρ4 for forming the lead-in channel, the hole p4 that is located diagonally to the hole p1 that forms the first fluid transfer path m A first fluid introduction passage i1 is formed inside the plate laminate and extends partially across the other end of the first fluid passage f1 between the plates in the first stage heat exchange section 13A, and the second stage heat exchange is performed. In part 13B, the first fluid passage between each plate in the subsequent heat exchange section 13B inside the plate material laminate: the first fluid outlet path extending over a part of the header on the other end side of f1 0 1 and the first fluid path f 2 between the plates In the penetrating part of the fluid introduction path i 1 and the penetrating part of the first fluid outlet path 0 1 with respect to the third inter-plate fluid path f 3, the neck part d of the hole p 4 in the lamination of the material 15 By extending to the corresponding hole p 4 of 15, communication between the first fluid introduction path i 1 and the second fluid path f 2 between the plates, and the first fluid outlet path 01 and the third fluid path between the plates are performed: Each of the communication with f 3 is cut off.

Four holes p 1 ~ for forming the lead-in path! The hole p2, which is located in the width direction of the plate with respect to the hole p1 that forms the first fluid transfer path m, of the pre-heat exchange section 13A, has a pre-stage heat exchange inside the plate material laminate. A second fluid introduction passage i2 is formed between the ends of the second fluid passage f2 between the plates in part 13A, which extends partially to one end of the second fluid passage f2. A third fluid outlet path o3 is formed across the one end header of the third inter-plate fluid path f3 in the subsequent heat exchange section 13B at the second stage, and the first inter-plate fluid path f1 is formed. In the penetrating portion of the second fluid introduction passage i2 and the penetrating portion of the third fluid outlet passage o3 with respect to the first fluid passage f1 between the plates, the neck d of the hole p2 in the lamination of the plate material 15 is the adjacent plate material. 15 to the corresponding hole p2, the communication between the second fluid introduction passage i2 and the first fluid passage f1 between the plates, and the third fluid outlet passage o3 and the first fluid passage f between the plates f 1 It is shut off the respective communication of.

In addition, the remaining one of the four holes p1 to ρ4 for forming the lead-in / out path is formed by the pre-stage heat exchange unit 13A in the pre-stage heat exchange unit 13A. A second fluid outlet path 0 2 is formed across the other end of the second fluid path f 2 between the plates in A at the other end side, and in the subsequent heat exchange section 13 B, the inside of the sheet laminate is formed. A third fluid introduction path i3 is formed to partially extend to the other end of the third fluid path f3 between the plates in the subsequent heat exchange section 13B. In the penetrating portion of the two fluid outlet passages o2 and the first fluid passage between the plates: at the penetrating portion of the third fluid inlet passage i3 with respect to 1, the holes p3 in the stack of the plate members 15 as in the other inlet / outlet passages The neck of d next to the plate 1 5 to the corresponding hole p 3, the communication between the second fluid outlet path 0 2 and the first fluid path f 1 between the plates, and the third fluid introduction path i 3 and the first fluid path f 1 between the plates Each communication with has been cut off.

In other words, with the above structure, the first fluid La is caused to flow in parallel from the first fluid introduction passage i1 to the plurality of inter-plate first fluid passages: 1 in the upstream heat exchange section 13A, Subsequently, the first fluid a, which has passed through the plurality of inter-plate first fluid passages f 1 in these pre-stage heat exchange units 13 A in parallel, is once gathered through the first fluid transfer passage m to form the first heat exchange unit 1A. The first fluid L that has flowed in parallel to the plurality of first fluid paths between plates in 3B: 1 and has passed in parallel through the plurality of first fluid paths f1 between the plates in these subsequent heat exchangers 13B a is discharged in a collective state from the first fluid outlet channel o1.

Then, in response to the flow of the first fluid La, the pre-stage heat exchange section 13A transfers the second fluid Lc from the second fluid introduction passage i2 to the plurality of inter-plate second fluid passages f2 in parallel. And the second fluid Lc, which has passed in parallel through the plurality of inter-plate second flow passages f 2, is discharged from the second fluid outlet passage o 2 in a collective state. In the exchange section 13A, heat is exchanged between the first fluid La (low-concentration absorbent) and the second fluid Lc (high-concentration absorbent) by a multi-pass counterflow method.

Further, in the second heat exchange section 13B, the third fluid Lb is caused to flow in parallel from the third fluid introduction path i3 into the third fluid path f3 between the plates, and the third fluid Lb The third fluid Lb, which has passed through the fluid path f 3 in parallel, is discharged in a collective state from the third fluid outlet path o 3, whereby the rear heat exchange section 13 B The first fluid La (low-concentration absorbing liquid) after heat exchange with the second fluid Lc (high-concentration absorbing liquid) in A is opposed to the third fluid Lb (medium-concentration absorbing liquid) by multiple passes. Heat is exchanged by the flow method.

In addition, as for the plate material 15 located at both ends in the plate material laminating direction in the plate material laminated body, the hole p 1 forming the first fluid transfer path m is closed. In the above-mentioned laminated sheet material, the former heat exchange section 13 A and the latter heat exchanger 13 B are arranged side by side in the laminating direction of the sheet material, while the two heat exchange sections 13 A, 13 B The two adjacent plate members 15 located at the boundary of the first fluid passage m close the holes p2 to p4 other than the hole p1 that forms the first fluid passage m. The neck d of one hole p1 is a plate material extending to the corresponding hole p1 of the other, and a vacuum-tight airtight space is formed between the plate materials 15 at these boundary portions. The airtight space between the plates in the state is made into a vacuum heat insulating layer 16 so as to prevent heat loss due to heat exchange between the first heat exchange section 13A and the second heat exchange section 13B.

For the manufacture of the heat exchanger 13 having the above structure, the gap between the peripheral folds of the adjacent plate members 15 and the neck 1 of the holes p1 to p4 and the corresponding hole extending the neck 1 The plate material 15 is laminated with the brazing material sandwiched between the necessary joints such as between p1 and p4, and this laminated plate material is put into a vacuum furnace. Then, the plate material laminate is heated in a vacuum furnace under vacuum to braze the above-mentioned necessary parts by brazing. In addition, the brazing under this vacuum is performed, and simultaneously with the bonding of the plate material 15, Between the plate members 15 located at the boundary between the heat exchange unit 13A and the post-stage heat exchange unit 13B, a vacuum airtight space as the vacuum heat insulating layer 16 is formed.

[Another embodiment]

Next, another embodiment will be described.

In the above-described embodiment, an example in which a vacuum heat insulating layer 16 is provided between two adjacent plate members 15 located at the boundary between the first heat exchange unit 13A and the second heat exchange unit 13B is described. As shown in Fig. 5, as shown in Fig. 5, three or more adjacent plate members 15 located at the boundary between the heat exchange sections 13A and 13B are each made into a vacuum insulation layer 16 between each other. You may.

In the above-described embodiment, the joining of the plate material 15 and the Although the production method in which the formation of the air insulation layer 16 is performed at the same time has been described, in carrying out the invention according to claim 4, depending on the case, the plate members 15 may be joined to each other to form the two heat exchange sections 13 A, An airtight space may be provided between the plate members 15 located at the boundary of the 13B, and a vacuum heat insulating layer 16 may be formed by extracting air from the airtight space.

The higher the degree of vacuum of the vacuum heat insulating layer 16 is, the higher the heat insulating effect can be obtained. However, the specific degree of vacuum of the vacuum heat insulating layer 16 may be appropriately determined from various conditions and the like. However, the present invention is not limited to the vacuum insulation layer 16.

In practicing the invention according to claim 2, instead of the vacuum heat insulating layer 16, the plates 15 located at the boundary between the front heat exchange section 13 A and the rear heat exchange section 13 B are connected to each other. A heat insulating material or a gas (for example, a non-corrosive gas, etc.) may be filled between the plates to form a heat insulating layer between the plates 15.

The number of parallel fluid paths f 1 and f 2 in the first heat exchange section 13 A and the number of parallel fluid paths f 1 and f 3 in the second heat exchange section 13 B are required. The number may be determined according to the heat exchange amount, and is not limited to the number of parallel rows shown in the above-described embodiment.

In the implementation of the invention according to claim 6, various methods can be applied as a specific method of brazing and joining the plate members 15 under a vacuum atmosphere. The gas may be appropriately determined according to various conditions.

The three-fluid plate heat exchanger according to the present invention is applicable not only to heat exchange between absorbents in an absorption refrigerator, but also to heat exchange of various fluids. Industrial applicability

In the present invention, the first fluid is stacked by laminating the two fluids and alternately flowing two fluids depending on the plate material. The present invention relates to a three-fluid plate heat exchanger for exchanging heat with a third fluid after exchanging heat with a second fluid.The present invention is applied to a refrigerator such as an absorption refrigerator. It is possible.

Claims

The scope of the claims

1. A three-fluid plate heat exchanger for sequentially exchanging heat of a first fluid with a second fluid and a third fluid,

A first fluid path for allowing a first fluid to pass through a portion of the plate material laminate near the one end side in the plate material lamination direction between the plate materials in the plate material laminate in which a large number of plate materials are laminated;にし a pre-stage heat exchange section in which plate-to-plate second fluid passages for passing the second fluid between the plates alternately in the plate stacking direction, and the other end of the plate stack in the plate stacking direction In the near portion, a first inter-plate fluid path for passing the first fluid between the plate members and a third inter-plate fluid path for passing the third fluid between the plate members are laminated. In the latter heat exchange section, which are alternately located in

A first fluid transfer path that allows the first fluid that has passed in parallel through the plurality of inter-plate first fluid paths in the pre-stage heat exchange section to flow in parallel to the plurality of inter-plate first fluid paths in the post-stage heat exchange section; Plate heat exchanger for three fluids provided.

2. The three-fluid according to claim 1, wherein a heat insulating layer through which fluid does not pass is provided between the plate materials located at the boundary between the first heat exchange unit and the second heat exchange unit in the stacked plate materials. Plate type heat exchanger.

3. Among the laminated plate materials, each of the three or more adjacent plate materials located at the boundary between the pre-stage heat exchange unit and the post-stage heat exchange unit is formed as a heat insulating layer through which fluid does not pass. The three-fluid plate heat exchanger according to claim 2,

4. Among the laminated plate materials, a space between the plate materials located at the boundary between the pre-stage heat exchange unit and the post-stage heat exchange unit is made a vacuum-tight space, and the heat insulation layer is made into a vacuum heat insulating layer. 4. The three-fluid plate heat exchanger according to claim 2 or 3.

5. In the state where the first fluid transfer passage is made to penetrate the plate material in the plate material lamination direction inside the plate material laminate, the first fluid passage between the plurality of plates in the pre-stage heat exchange unit and the post-stage heat exchange The three-fluid plate heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger extends over a plurality of first fluid passages between the plates in the section.

6. The method for producing a three-fluid plate heat exchanger according to claim 4, wherein

When a number of the laminated plate members are placed under vacuum and the adjacent plate members are solder-bonded to form the fluid paths between the plates, the adjacent plate materials are solder-bonded under the vacuum. A three-fluid plate-type heat that simultaneously forms a vacuum-tight airtight space serving as the vacuum heat insulating layer between the plate members located at the boundary between the first-stage heat exchange unit and the second-stage heat exchange unit. Exchanger manufacturing method.