JP3936088B2 - Three-fluid plate heat exchanger and method for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a three-fluid plate heat exchanger, and more particularly to a three-fluid plate heat exchanger that sequentially exchanges heat between a first fluid and a second fluid and a third fluid, and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, in this type of heat exchanger, as shown in FIG. 6, in a plate material laminate in which a large number of plate materials 15 are laminated, a portion closer to one end side in the plate material longitudinal direction in the plate material laminate is provided between the plate materials 15. The first-stage heat exchange f1 between which the first fluid La is allowed to pass through and the second fluid path f2 between the plates where the second fluid Lc is allowed to pass between the plate materials 15 are alternately positioned in the plate material stacking direction. A portion near the other end in the longitudinal direction of the plate material in the plate material laminate is passed through the first fluid La between the plate materials 15 following the first fluid passage f1 between the plates of the preceding stage heat exchange portion 13A. The inter-plate first fluid path f1 and the inter-plate third fluid path f3 that allows the third fluid Lb to pass between the plate members 15 are the rear heat exchange sections 13B that are alternately positioned in the plate material stacking direction (special (See Kaihei 9-60996).
[0003]
That is, the upstream heat exchanger 13A that exchanges heat between the first fluid La and the second fluid Lc, and the subsequent heat exchanger 13B that exchanges heat between the first fluid La and the third fluid Lb, are arranged in the longitudinal direction of the plate 15. The structure was integrated in parallel.
[0004]
[Problems to be solved by the invention]
However, in this conventional structure, the whole heat exchanger 13A and the rear heat exchanger 13B can be considerably downsized compared to the case where they are constituted by separate plate heat exchangers. However, there was still room for improvement in the demand for greater energy efficiency and further energy saving.
[0005]
In view of this situation, the main problem of the present invention is that it is possible to further reduce the size by adopting a rational structure in the integration of the front-stage heat exchange section and the rear-stage heat exchange section, and to further reduce heat loss. It is in the point which enables reduction.
[0006]
[Means for Solving the Problems]
[1] In the invention according to claim 1, in order to sequentially exchange heat between the first fluid and 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 that is closer to one end in the plate material stacking direction passes a first fluid between the plate materials, and a first fluid path between the plates, The second fluid path between the plates that allows the second fluid to pass between them is a front heat exchange section that is alternately positioned in the plate material stacking direction,
In addition, the first fluid passage between the plates that allows the first fluid to pass between the plate members and the third fluid that passes between the plate members pass through the portion of the plate member laminate near the other end in the plate stacking direction. The inter-plate third fluid path to be made is a rear-stage heat exchange portion that is alternately positioned in the plate material stacking direction,
And the 1st fluid transition which makes the 1st fluid which passed the plurality of 1st fluid paths between plates in the preceding paragraph heat exchange part flow in parallel into the plurality of 1st fluid paths between the plates in the latter stage heat exchange part The road is provided.
[0007]
That is, according to this configuration, the first stage heat exchanging part that exchanges heat between the first fluid and the second fluid and the subsequent stage heat exchanging part that exchanges heat between the first fluid and the third fluid are arranged in the plate material stacking direction. Since the integrated form is adopted, the length of the laminated plate is halved (in terms of area) compared to the structure in which the former heat exchange part and the latter heat exchange part are arranged side by side in the longitudinal direction as in the conventional structure described above. In addition, it is possible to make the plate laminate more three-dimensionally consolidated in a state that is reduced by half), thereby making the entire heat exchanger more compact and more installable and easy to handle. In addition, since the length of the plate material is halved (halved area), it is possible to easily cope with thermal shrinkage and thermal strain, and the manufacture of the heat exchanger itself can be facilitated.
[0008]
In addition, since the outer surface area of the plate laminate can be reduced by the above three-dimensional aggregation, it is possible to suppress heat dissipation loss from the outer surface, thereby making the heat exchanger more excellent in terms of energy saving. be able to.
[0009]
Moreover, in the invention which concerns on Claim 1 , between the board | plate materials located in the boundary part of the said front | former stage heat exchange part and the said back | latter stage heat exchange part among the laminated | stacked board | plate materials is made into the heat-insulating layer of a fluid non-passage.
[0010]
According to this configuration, heat transfer between the front heat exchange section and the rear heat exchange section at different temperature levels is prevented by the heat insulating layer, and heat loss due to heat transfer between the two heat exchange sections is prevented. (In short, heat loss due to heat exchange between the second fluid and the third fluid that are not intended for heat exchange) can be suppressed, thereby further improving the heat exchange performance with respect to the first fluid. A heat exchanger that is superior and more advantageous in terms of energy saving can be obtained.
[0011]
In addition, in the state of utilizing the original plate laminated structure in which a large number of plates are laminated, a heat insulating layer is formed at the boundary between the front heat exchange unit and the rear heat exchange unit, so that the formation of the heat insulating layer itself is facilitated, The heat exchanger can be easily and efficiently manufactured.
[0012]
[2] In the invention according to claim 2 , among the stacked plate members, each of the three or more adjacent plate members located at the boundary between the front heat exchange unit and the rear heat exchange unit is not fluid-free. Make it a heat insulating layer.
[0013]
According to this configuration, in carrying out the invention according to claim 1 described above, since each of the three or more adjacent plate materials is made into a heat insulating layer, the heat insulating layer is multilayered to increase the thickness of the heat insulating layer as a whole. The heat insulation effect can be enhanced in the secured state, and the heat loss due to heat transfer between the front-stage heat exchange section and the rear-stage heat exchange section can be more effectively suppressed.
[0014]
And if it is this structure, when taking the board laminated structure which laminates | stacks the board | plate material with a corrugated cross section in the state which the corrugated ridges oppose each other (that is, heat transfer through the joint part of a corrugated ridge part) Even in the case where the heat loss is expected, the heat loss due to heat transfer between the front-stage heat exchange section and the rear-stage heat exchange section can be effectively suppressed with the improvement of the heat insulation effect due to the multilayering as described above.
[0015]
[3] In the invention according to claim 3 , in the laminated plate material, a space between the plate materials located at the boundary between the front heat exchange section and the rear heat exchange section is made an airtight space in a vacuum state, and the heat insulation is performed. The layer is a vacuum insulation layer.
[0016]
According to this configuration, in carrying out the invention according to claim 1 or 2 described above, the heat insulating layer formed between the plate members is a vacuum heat insulating layer, thereby having a very high heat insulating effect possessed by the vacuum space, Heat loss due to heat exchange between the exchange unit and the rear heat exchange unit can be more effectively suppressed.
[0017]
Also, with this configuration, since a heat insulating material is not necessary, the formation of the heat insulating layer can be further facilitated by forming the heat insulating layer using the original plate laminated structure.
[0018]
[4] In the invention according to claim 4 , in the state in which the plate material is penetrated in the plate material stacking direction in the plate material stack in the first fluid transfer path, the plurality of inter-plate plates One fluid path and a plurality of inter-plate first fluid paths in the latter-stage heat exchange section are configured to extend.
[0019]
According to this configuration, the first fluid transfer path for transferring the first fluid from the first fluid passage between the plates of the front heat exchange section to the first fluid passage between the boards of the rear heat exchange section is laminated by the external pipe. Compared with the structure formed outside the body, the structure around the plate laminate can be simplified and the entire heat exchanger can be made more compact.
[0020]
In addition, in addition to this configuration, each fluid introduction path and lead-out path (that is, a first fluid introduction path for allowing the first fluid to flow in parallel to the plurality of inter-plate first fluid paths in the preceding stage heat exchange section, the preceding stage heat exchange A second fluid introduction path for allowing the second fluid to flow in parallel to the plurality of inter-plate second fluid paths in the section, and collecting and discharging the second fluid that has passed through the plurality of inter-plate second fluid paths in the front heat exchange section A second fluid lead-out path, a third fluid introduction path for allowing the third fluid to flow in parallel into the plurality of inter-plate third fluid paths in the rear-stage heat exchange section, and a plurality of inter-plate third fluid paths in the rear-stage heat exchange section. A third fluid lead-out path that collects and discharges the third fluid that has passed through, and a first fluid lead-out path that collects and discharges the first fluid that has passed through the first inter-plate first fluid paths in the rear-stage heat exchange section. In a state where the plate material is penetrated in the plate material stacking direction inside the plate material laminate. Taking the configuration in which span the corresponding plates the fluid path can be a structure around plate stack in the further simplified to achieve a compactness of the whole heat exchanger more effectively.
[0021]
[5] In the invention according to claim 5 , to manufacture the three-fluid plate heat exchanger of the invention according to claim 3 ,
In the state where a large number of the stacked plate materials are placed under vacuum, when adjacent plate materials are brazed and joined to form each of the inter-plate fluid paths, by brazing the adjacent plate materials under the vacuum, 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 positioned at the boundary between the front heat exchange section and the rear heat exchange section.
[0022]
According to this method, since the vacuum heat insulating layer is formed simultaneously with the joining of the adjacent plate members using a so-called vacuum brazing method, for example, by the other joining methods, the front heat exchange section and the rear heat exchange section Compared to the formation of an airtight space between plate members located at the boundary, and then vacuum extraction from the airtight space to form a vacuum heat insulation layer, the formation of the vacuum heat insulation layer itself can be made much easier. The heat exchanger can be manufactured easily and efficiently.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an apparatus configuration of an absorption refrigerator, where 1 is a high-temperature regenerator, 2 is a low-temperature regenerator, 3 is a condenser, 4 is an evaporator, and 5 is an absorber. The low-concentration absorption liquid La (for example, lithium bromide aqueous solution) that has absorbed (for example, water) is heated by the high-temperature heater 6 to evaporate and separate the refrigerant R.
[0024]
The medium concentration absorbing 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 r1, and the refrigerant vapor R ′ generated in the high temperature regenerator 1 is cooled through the flow path r2. The regenerator 2 is sent to the low temperature heater 7 as a heat source, whereby the low temperature regenerator 2 heats the medium concentration absorbent Lb using the refrigerant vapor R ′ generated in the high temperature regenerator 1 as a heat source, thereby increasing its medium concentration. The refrigerant R is further evaporated and separated from the absorbing liquid Lb.
[0025]
The refrigerant vapor R ′ generated in the low temperature regenerator 2 and the refrigerant vapor R ′ after being used as a heat source in the low temperature heater 7 are condensed by being cooled by the cooler 8 in the condenser 3, and this condensed refrigerant R (That is, liquid refrigerant) is sent to the evaporator 4 through the flow path r3.
[0026]
In the evaporator 4, the condensed refrigerant R sent from the condenser 3 is circulated to the interior heat exchanger 11 by the spreader 10 while being circulated by the refrigerant pump 9, and the refrigerant R is evaporated along with this scatter, The cooling target fluid C (for example, water or brine) flowing through the interior heat exchanger 11 is cooled by taking the heat of vaporization.
[0027]
On the other hand, the high-concentration absorbing liquid Lc after the refrigerant R is separated by the low-temperature regenerator 2 is sent to the absorber 5 through the flow path r4, and the absorber 5 sprays the high-concentration absorbing liquid Lc sent from the low-temperature regenerator 2. The refrigerant vapor R ′ generated in the evaporator 4 is absorbed by the spray absorbent Lc by being sprayed by the evaporator 12, thereby forming a low-pressure atmosphere for evaporating the sprayed refrigerant R at a low temperature in the evaporator 4. .
[0028]
The low concentration absorbent La after absorbing the refrigerant vapor R ′ by the absorber 5 is returned to the high temperature regenerator 1 through the flow path r5, and the process returns to the step of separating the refrigerant R from the low concentration absorbent La again.
[0029]
13 is a medium-temperature high-concentration absorbing liquid Lc sent from the low-temperature regenerator 2 to the absorber 5, and a high-temperature sent from the high-temperature regenerator 1 to the low-temperature regenerator 2. The heat recovery heat exchanger recovers the retained heat of the high concentration absorption liquid Lc and the medium concentration absorption liquid Lb by sequentially exchanging heat with the medium concentration absorption liquid Lb. In FIG. 1, the heat recovery heat exchanger 13 is shown only schematically to represent the heat exchange order of the low concentration absorbent La to the high concentration absorbent Lc and the medium concentration absorbent Lb, and will be described later. Does not match the structure.
[0030]
Reference numeral 14 denotes a cooler that removes heat absorbed by the absorption of the refrigerant into the dispersed absorbent Lc in the absorber 5. The cooler 14 in the absorber 5 and the cooler 8 in the condenser 3 are cooled. A working fluid W (for example, cooling water to be circulated with the cooling tower) is supplied.
[0031]
A heat recovery heat exchanger 13 that exchanges heat between three fluids of a low-concentration absorbent La, a high-concentration absorbent Lc, and a medium-concentration absorbent Lb (hereinafter referred to as first to third fluids in this order) is shown in FIG. As shown in FIG. 4, a plate member 15 having a corrugated cross-sectional shape leaving the vicinity of both ends and provided with holes p1 to p4 for forming lead-out entrances at the corners is formed into a corrugated peak as shown in FIG. A large number of layers are stacked in a state where they are opposed to each other, and a portion near one end side in the plate material stacking direction in the plate material stack is a pre-stage heat exchange section 13A for exchanging heat between the first fluid La and the second fluid Lc. On the other hand, the portion near the other end in the plate material stacking direction in the plate material laminate is the first fluid La heat-exchanged with the second fluid Lc in the previous heat exchange section 13A, followed by heat with the third fluid Lb. The rear heat exchange section 13B is exchanged.
[0032]
In the former stage heat exchanging portion 13A, in the above-described plate material laminated structure, the inter-plate first fluid f1 that allows the first fluid La to pass between the adjacent plate materials 15 and the second fluid Lc between the adjacent plate materials 15 are provided. The inter-plate second fluid f2 to be passed is alternately positioned in the plate material stacking direction, and the first fluid La and the second fluid are used with the plate material 15 as the heat transfer wall during the passage of the inter-plate fluid paths f1 and f2. Heat exchange with Lc.
[0033]
Similarly, in the post-stage heat exchanging portion 13B, in the above-mentioned plate material laminated structure, the first fluid f1 between the plates that allows the first fluid La to pass between the adjacent plate materials 15 and the first plate between the adjacent plate materials 15 are the second. The inter-plate third fluids f3 that allow the three fluids Lb to pass through are alternately positioned in the plate material laminating direction, and in the process of passing through the inter-plate fluid paths f1 and f3, the plate material 15 is used as the heat transfer wall to form the first fluid La. And the third fluid Lb are heat-exchanged.
[0034]
Each of the inter-plate fluid paths f1 to f3 is subdivided into a large number in the plate width direction perpendicular to the fluid flow direction by the plate material laminated structure in which the corrugated peaks are opposed to each other. While ensuring a larger thermal area, high strength is obtained.
[0035]
Both end portions of the inter-plate fluid passages f1 to f3 are formed as header portions for the flow paths subdivided in the plate width direction by making the vicinity of both end portions of each plate material 15 into a flat plate shape having no waveform. On the other hand, one hole p1 among the holes p1 to p4 for forming lead-out passages formed at the four corners of each plate 15 is the first fluid between the plates in the front heat exchange section 13A inside the plate laminate. The first fluid connecting path m is formed between the one end side header portions of the path f1 and the one end side header portions of the inter-plate first fluid paths f1 in the rear heat exchange section 13B, and the inter-plate second fluid path f2 and the plate In the through portion of the first fluid transfer path m with respect to each of the third fluid paths f3, the first fluid transfer path is formed by extending the neck portion d of the hole p1 to the corresponding hole p1 of the adjacent plate material 15 in the lamination of the plate materials 15. m and the second fluid passage f2 between the plates, and the first They are cut off respectively of the communication between the fluid crossover path m and the interplate third fluid paths f3.
[0036]
In FIG. 2, in order to show the first fluid transfer path m and the later-described outlet / inlet paths i 1, o 1, i 2, o 2, i 3, o 3, the overlapping portions of these flow paths are expanded. A longitudinal section of the heat exchanger 13 is shown.
[0037]
Of the four holes p1 to p4 for forming the lead-in / inlet passages, the hole p4 located at a diagonal position with respect to the hole p1 that forms the first fluid transfer path m is the inside of the plate material laminate in the front heat exchange section 13A. 1A, the first fluid introduction path i1 extending between the other end side headers of the first fluid passages f1 between the plates in the front heat exchange section 13A is formed. In the rear heat exchange section 13B, the rear heat exchange section is formed inside the plate laminate. 13B, a first fluid lead-out path o1 extending between the other end side headers of the first inter-plate first fluid path f1 is formed, a through portion of the first fluid introduction path i1 with respect to the second inter-plate fluid path f2, and the inter-plate In the through portion of the first fluid lead-out path o1 with respect to the third fluid path f3, the first fluid introduction path i1 and the plate are formed by extending the neck portion d of the hole p4 to the corresponding hole p4 of the adjacent plate material 15 in the lamination of the plate materials 15. With the second fluid path f2. Passing, and, they are cut off each of the communication between the first fluid outlet path o1 and the interplate third fluid paths f3.
[0038]
Of the four holes p1 to p4 for forming the lead-in / inlet passages, the hole p2 positioned adjacent to the hole p1 forming the first fluid transfer path m in the plate width direction is a plate material laminate in the front heat exchange section 13A. Is formed with a second fluid introduction path i2 extending between the one end side header portions of the inter-plate second fluid path f2 in the front heat exchange section 13A, and the rear heat exchange section 13B has a rear heat exchange inside the plate laminate. Forming a third fluid lead-out path o3 across one end side header part of each inter-plate third fluid path f3 in the portion 13B, a through portion of the second fluid introduction path i2 with respect to the inter-plate first fluid path f1, and the inter-plate In the through portion of the third fluid outlet passage o3 with respect to the first fluid passage f1, the neck d of the hole p2 is extended to the corresponding hole p2 of the adjacent plate member 15 in the stacking of the plate members 15, so that the second fluid introduction path i2 and the plate First fluid path f Communicating with, and are cut off each of the communication between the third fluid outlet path o3 and the interplate first fluid paths f1.
[0039]
Further, the remaining one hole p3 among the four holes p1 to p4 for forming the lead-in / inlet passage is the second fluid between the plates in the front heat exchanger 13A in the front heat exchanger 13A in the front heat exchanger 13A. A second fluid lead-out path o2 is formed across the other header sections of the path f2, and the other end of each inter-plate third fluid path f3 in the rear-stage heat exchange section 13B inside the plate stack in the rear-stage heat exchange section 13B. A third fluid introduction path i3 extending between the side header portions is formed, a penetrating portion of the second fluid lead-out path o2 with respect to the inter-plate first fluid path f1, and a third fluid introduction path i3 with respect to the inter-plate first fluid path f1 In the penetrating portion, like the other lead-in / take-in paths, the second fluid lead-out path o2 and the inter-plate first fluid path are formed by extending the neck portion d of the hole p3 to the corresponding hole p3 in the adjacent plate member 15 in the stacking of the plate members 15. communication with f1 and It is blocked respectively communicating with the fluid introduction path i3 and interplate first fluid paths f1.
[0040]
That is, with the above structure, the first fluid La is caused to flow in parallel from the first fluid introduction path i1 to the plurality of inter-plate first fluid paths f1 in the preceding stage heat exchanging section 13A, and then, the preceding stage heat exchange. The first fluid La that has passed through the plurality of inter-plate first fluid paths f1 in the section 13A in parallel is temporarily gathered through the first fluid transfer path m, and the plurality of inter-plate first fluid paths f1 in the rear heat exchange section 13B. In parallel, the first fluid La that has passed through the plurality of inter-plate first fluid paths f1 in the rear heat exchange section 13B in parallel is discharged from the first fluid outlet path o1 in a collective state.
[0041]
Then, with respect to the flow of the first fluid La, the upstream heat exchange section 13A causes the second fluid Lc to flow in parallel from the second fluid introduction path i2 into the plurality of inter-plate second fluid paths f2, and the plurality of these The second fluid Lc that has passed through the second inter-plate second fluid path f2 in parallel is discharged from the second fluid lead-out path o2 in an aggregated state, whereby the first heat La (low concentration absorption) The liquid is exchanged with the second fluid Lc (high-concentration absorbing liquid) by a multi-pass counter-flow method.
[0042]
Further, in the rear heat exchange section 13B, the third fluid Lb is caused to flow in parallel from the third fluid introduction path i3 into the plurality of inter-plate third fluid paths f3, and the plurality of inter-plate third fluid paths f3 are connected in parallel. The third fluid Lb that has passed through is discharged from the third fluid lead-out path o3 in an aggregated state, whereby the second-stage heat exchange unit 13B and the second-fluid Lc (high-concentration absorbent) and the heat in the first-stage heat exchange unit 13B. The first fluid La (low-concentration absorbent) after the exchange is heat-exchanged with the third fluid Lb (medium-concentration absorbent) in a multi-pass counter flow system.
[0043]
In addition, about the board | plate material 15 located in the both ends of a board | plate material lamination direction in a board | substrate laminated body, the hole p1 which forms the 1st fluid passage m is obstruct | occluded.
[0044]
The above-mentioned plate material laminate has a structure in which the front heat exchange part 13A and the rear heat exchange part 13B are arranged side by side in the plate material lamination direction, whereas two sheets located at the boundary between both heat exchange parts 13A and 13B. The adjacent plate members 15 close the holes p2 to p4 other than the hole p1 that forms the first fluid transfer path m, and the neck portion d of one hole p1 that forms the first fluid transfer path m corresponds to the other corresponding hole. The plate material that extends to p1 is a vacuum-tight airtight space between the plate members 15 at the boundary portion, whereby the vacuum plate-to-plate airtight space is made the vacuum heat insulating layer 16, and the front heat exchange section Heat loss due to heat transfer between 13A and the rear heat exchange section 13B is prevented.
[0045]
About manufacture of the heat exchanger 13 of the above structure, between the periphery folding | turning parts of the adjacent board | plate material 15, between the neck part d of the holes p1-p4, and the corresponding holes p1-p4 which spanned the neck part d, etc. The plate material 15 is laminated in a state where the brazing material is sandwiched between the places where joining is required, and this plate material laminate is put into a vacuum furnace. Then, the plate material laminate is heated in vacuum in a vacuum furnace to braze and join the necessary joints. Also, by this brazing joint in the vacuum, simultaneously with the joining of the plate material 15, A vacuum-tight airtight space serving as the vacuum heat insulating layer 16 is formed between the plate members 15 located at the boundary between the exchange part 13A and the rear heat exchange part 13B.
[0046]
[Another embodiment]
Next, another embodiment will be listed.
[0047]
In the above-described embodiment, the example in which the vacuum heat insulating layer 16 is formed between the two adjacent plate materials 15 located at the boundary portion between the front stage heat exchange section 13A and the rear stage heat exchange section 13B is shown in FIG. As shown in FIG. 3, each of the space between the three or more adjacent plate members 15 located at the boundary between the heat exchange portions 13A and 13B may be the vacuum heat insulating layer 16.
[0048]
In the above embodiment, although the simultaneous preparation junction and the formation of the vacuum insulation layer 16 of the board 15 by using a vacuum brazing process, the practice of the invention according to claim 3, in some cases, the plate member 15 is joined, and the space between the plate members 15 located at the boundary between the heat exchange portions 13A and 13B is made an airtight space, and then the vacuum heat insulating layer 16 is formed by extracting air from the airtight space. Good.
[0049]
In addition, the higher the degree of vacuum of the vacuum heat insulating layer 16, the higher the heat insulating effect can be obtained, but the specific vacuum degree of the vacuum heat insulating layer 16 may be appropriately determined based on various conditions and the like. It is not limited to the heat insulation layer 16.
[0050]
In carrying out the present invention, instead of the vacuum heat insulating layer 16, a heat insulating material or a gas (for example, a non-corrosive material) is provided between the plate materials 15 positioned at the boundary between the front heat exchanging portion 13A and the rear heat exchanging portion 13B. Gas etc.) may be filled to form a heat insulating layer between the plate materials 15.
[0051]
If the parallel number of the inter-plate fluid passages f1 and f2 in the front-stage heat exchange section 13A and the parallel number of the inter-plate fluid paths f1 and f3 in the rear-stage heat exchange section 13B are respectively determined according to the required heat exchange amount. The number is not limited to the parallel number shown in the above embodiment.
[0052]
In the implementation of the invention according to claim 5 , various methods can be applied as a specific method for brazing and joining the plate members 15 in a vacuum atmosphere, and the degree of vacuum and the dilute atmosphere gas at the time of brazing can also be used. What is necessary is just to determine suitably according to various conditions.
[0053]
The three-fluid plate heat exchanger according to the present invention is not limited to heat exchange between absorption liquids in an absorption refrigerator, and can be applied to heat exchange of various fluids.
[Brief description of the drawings]
[Fig. 1] Configuration diagram of absorption chiller [Fig. 2] Longitudinal sectional view of heat exchanger [Fig. 3] Partial cross sectional view of heat exchanger [Fig. 4] Schematic perspective view of heat exchanger [Fig. FIG. 6 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.
13A Pre-stage heat exchange section 13B Post-stage heat exchange section 15 Plate material 16 Heat insulation layer, vacuum heat insulation layer f1 Inter-plate first fluid path f2 Inter-plate second fluid path f3 Inter-plate third fluid path La First fluid Lc Second fluid Lb Second 3 fluid m 1st fluid crossing

Claims (5)

A three-fluid plate heat exchanger for sequentially exchanging heat between the first fluid and 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 that is closer to one end in the plate material stacking direction passes a first fluid between the plate materials, and a first fluid path between the plates, The second fluid path between the plates that allows the second fluid to pass between them is a front heat exchange section that is alternately positioned in the plate material stacking direction,
In addition, the first fluid passage between the plates that allows the first fluid to pass between the plate members and the third fluid that passes between the plate members pass through the portion of the plate member laminate near the other end in the plate stacking direction. The inter-plate third fluid path to be made is a rear-stage heat exchange portion that is alternately positioned in the plate material stacking direction,
A first fluid transfer path that allows the first fluid that has passed in parallel through the plurality of first inter-plate fluid paths in the front heat exchange section to flow in parallel to the plurality of inter-plate first fluid paths in the rear heat exchange section; Ri Oh provided,
A three-fluid plate heat exchanger in which a heat-insulating layer that does not pass a fluid is provided between plate members positioned at a boundary portion between the front heat exchange unit and the rear heat exchange unit among the stacked plate members . 2. The fluid non-passing heat-insulating layer is formed between each of three or more adjacent plate members positioned at a boundary portion between the front-stage heat exchange unit and the rear-stage heat exchange unit among the stacked plate members. Three-fluid plate heat exchanger. 2. The heat insulating layer is formed as a vacuum heat insulating layer by forming a vacuum-tight airtight space between the plate materials positioned at the boundary between the front heat exchange portion and the rear heat exchange portion of the stacked plate materials. Or the plate type heat exchanger for three fluids of 2 . A plurality of first fluid passages between the plates in the front heat exchange section and a plurality in the rear heat exchange section in the state where the plate material is penetrated in the plate material stacking direction inside the plate material laminate in the first fluid transfer path. The plate-type heat exchanger for three fluids according to any one of claims 1 to 3, wherein the plate-type heat exchanger is extended to the first fluid passage between the plates . It is a manufacturing method of the plate type heat exchanger for three fluids according to claim 3,
  In the state where a large number of the stacked plate materials are placed under vacuum, when adjacent plate materials are brazed and joined to form each of the inter-plate fluid paths, by brazing the adjacent plate materials under the vacuum, Manufacture of a three-fluid plate heat exchanger that simultaneously forms a vacuum-tight airtight space as the vacuum heat insulating layer between the plate members located at the boundary between the front heat exchange section and the rear heat exchange section Method.

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