JP2007271197A - Absorption type refrigerating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact absorption type refrigerating device of low costs. <P>SOLUTION: In this absorption type refrigerating device comprising a generator, a solution heat exchanger, a condenser, an evaporator and an absorber, the generator is disposed on an upper portion of one sheet, the solution heat exchanger is disposed on its lower portion, and further the evaporator and the absorber are disposed on a lower portion of the solution heat exchanger, so that the numbers of sheets of plates necessary on the basis of the quantity of exchanged heat in the generator, the quantity of exchanged heat between thick solution flowing out from the generator and dilute solution flowing into the generator, and the quantity of exchanged heat in the evaporator and the absorber, decided on the basis of the absorption refrigerating cycle, are agreed with each other, and the plurality of plates are integrally stacked, thus the device can be miniaturized as a whole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the structure of an absorption refrigeration apparatus.

  In the conventional absorption refrigeration system, as a heat exchanger constituting the absorption cycle, a proposal to make each plate heat exchanger independently for further compaction, and a plate type evaporator and absorption The thing which combined and united with the device, or the thing which combined these with the supercooler further, etc. are proposed (refer patent documents 1-3).

Japanese Patent Laid-Open No. 10-82594 JP 2001-153582 A JP-A-10-232066

  However, in addition to the heat exchangers that make up the absorption cycle, there are generators and solution heat exchangers. In small absorption refrigerators and single-effect machines that use exhaust heat (hot water), these Even if each of the heat exchangers is made into a plate and combined, there is a limit to downsizing and cost reduction.

  In order to solve the above problems, for example, if each heat exchanger constituting the absorption refrigeration cycle is integrated to form a single or two plate heat exchanger structure as a whole, a small machine or the like Therefore, further downsizing and cost reduction are possible.

  However, in order to do so, it is necessary to configure the generator and the solution heat exchanger part, the absorber and the evaporator part with one or two plates, and the same number of plates or the distance between the plates. It is necessary to devise (pitch).

  The present invention has been made to solve such a problem, and in order to make each of the heat exchangers as described above integral, the exchange heat amount of the generator in the plate portion and the solution heat exchanger An object of the present invention is to provide an absorption refrigeration apparatus in which the number of plates is the same as a whole by appropriately forming each heat transfer area so that the exchange heat amount and the exchange heat amount of the evaporator and the absorber are matched. To do.

  In order to achieve the above object, the present invention is configured with the following problem solving means.

(1) First Problem Solving Means The first problem solving means of the present invention is an absorption refrigeration apparatus comprising a generator, a solution heat exchanger, a condenser, an evaporator, and an absorber, and its absorption Necessary from the amount of exchange heat in the generator determined from the refrigeration cycle, the amount of exchange heat between the concentrated solution flowing out of the generator and the dilute solution flowing into the generator, and the amount of exchange heat in the evaporator and absorber In order to match the number of plates, a generator is formed at the top of one plate and a solution heat exchanger is formed at the bottom thereof, while an evaporator and an absorber are formed at the bottom of the solution heat exchanger. It is characterized by stacking and integrating multiple plates.

  According to such a configuration, the heat transfer area of the plate portion of each heat exchanger is such that the generator, the solution heat exchanger, the absorber, the evaporator, etc. are aligned at the same interval and the number of plates is the same. By appropriately setting the above, a plurality of plates can be laminated and integrated relatively easily, and each heat exchanger section can be integrally formed in one plate type structure.

  As a result, for example, by adopting an indirect (solution separation cooling) air cooling system, a total of only three heat exchangers including a plate heat exchanger, a condenser, and an air cooling cooler can be compact and low cost. An absorption refrigeration cycle can be formed, and reliability is greatly improved.

  In addition, if necessary, an air-cooled condenser and an air-cooled solution-cooled heat exchanger can be overlapped with each other to form two heat exchangers, and the number of parts can be greatly reduced.

(2) Second Problem Solving Means The second problem solving means of the present invention is an absorption refrigeration apparatus comprising a generator, a solution heat exchanger, a condenser, an evaporator, and an absorber, and its absorption Necessary from the amount of exchange heat in the generator determined from the refrigeration cycle, the amount of exchange heat between the concentrated solution flowing out of the generator and the dilute solution flowing into the generator, and the amount of exchange heat in the evaporator and absorber In order to match the number of plates, a generator is formed at the top of one plate, a solution heat exchanger at the bottom, and an evaporator at the bottom of the solution heat exchanger, while the other plate has A generator is formed in the upper part, a solution heat exchanger is formed in the lower part, and an absorber is formed in the lower part of the same solution heat exchanger. .

  According to such a configuration, when forming the generator, the solution heat exchanger, the absorber, and the evaporator, each of the heat plates is arranged so that the number of plates is the same and the number of the plates is the same. By appropriately setting the heat transfer area of the plate portion of the exchanger, a plurality of plates can be laminated and integrated relatively easily, and each heat exchanger portion can be formed into one plate-type structure.

  As a result, for example, by adopting an indirect (solution separation cooling) air cooling system, only a total of three heat exchangers, one plate type heat exchanger, a condenser, and an air cooling solution cooling heat exchanger, are used. Thus, the absorption refrigeration cycle can be formed in a compact and low-cost manner, and the reliability is greatly improved.

  In addition, if necessary, an air-cooled condenser and an air-cooled solution-cooled heat exchanger can be overlapped with each other to form two heat exchangers, and the number of parts can be greatly reduced.

  Moreover, according to such a structure, since an evaporator and an absorber can be formed with another plate, the heat-shielding property between them becomes high.

(3) Third Problem Solving Means According to a third problem solving means of the present invention, in the configuration of the first or second problem solving means, the dilute solution flows down the plate portion of the generator in a liquid film state, The refrigerant solution is heated and concentrated by the heating fluid that flows inside the plate part to generate refrigerant vapor, while the concentrated solution that has become concentrated due to the generation of refrigerant vapor is cooled by the dilute solution flowing into the generator in the lower solution heat exchanger. The refrigerant vapor that flows into the absorber after being absorbed and flows down the plate portion of the absorber in a liquid film state absorbs the refrigerant vapor evaporated by the evaporator, and the absorption heat generated during absorption of the refrigerant vapor is absorbed inside the plate portion. It is comprised so that it may be removed by the cooling fluid which flows through.

  According to such a configuration, it is possible to flow the solution in a liquid film state by natural flow from the generator to the absorber, high efficiency with high performance regeneration and heat exchange, evaporation and absorption action and high energy saving effect. Driving becomes possible.

  Further, the absorbed heat in the absorber is efficiently removed by the fluid to be cooled flowing in the plate portion of the absorber.

(4) Fourth Problem Solving Means According to a fourth problem solving means of the present invention, in the configuration of the first or second problem solving means, the dilute solution flows down the plate portion of the generator in a liquid film state, While the refrigerant liquid is heated and concentrated by the heated liquid flowing inside the plate section to generate refrigerant vapor, the concentrated solution generated by generating refrigerant vapor is cooled by the dilute solution flowing into the generator in the lower solution heat exchanger. After that, it is mixed with the dilute solution supercooled separately by the air-cooled solution heat exchanger, flows into the absorber, and absorbs the refrigerant vapor evaporated by the evaporator when flowing down the plate part of the absorber It is characterized by being.

  According to such a configuration, from the generator to the absorber, it is possible to flow the solution in a large area liquid film state by natural flow, high performance regeneration and heat exchange, evaporation and absorption action and energy saving effect Highly efficient operation is possible.

  Further, the absorption heat in the absorber is efficiently removed by supercooling the absorption liquid by a separately provided air-cooled solution heat exchanger.

  Therefore, the structure of the absorber itself may be a simple flat plate without a cooling part, and is suitable for further miniaturization and cost reduction.

(5) Fifth Problem Solving Means According to a fifth problem solving means of the present invention, in the configuration of the first or second problem solving means, the dilute solution flows down the plate portion of the generator in a liquid film state, While the refrigerant liquid is heated and concentrated by the heated liquid flowing inside the plate section to generate refrigerant vapor, the concentrated solution generated by generating refrigerant vapor is cooled by the dilute solution flowing into the generator in the lower solution heat exchanger. Is mixed with a dilute solution that separately flows into an air-cooled solution heat exchanger, and the mixed concentrated solution and dilute solution are supercooled by an air-cooled solution heat exchanger and then flow into the absorber, and the plate of the absorber It is configured to absorb the refrigerant vapor evaporated by the evaporator when flowing down the section.

  According to such a configuration, from the generator to the absorber, it is possible to flow the solution in a large area liquid film state by natural flow, high performance regeneration and heat exchange, evaporation and absorption action and energy saving effect Highly efficient operation is possible.

  Further, in this configuration, the concentrated solution generated by generating the refrigerant vapor is cooled with a dilute solution flowing into the generator in the lower solution heat exchanger, and then flows into the separately provided air-cooled solution heat exchanger. The concentrated solution and the diluted solution, which are mixed with each other, are supercooled through an air-cooled solution heat exchanger and then flow into the absorber and flow down the plate portion of the absorber.

  Therefore, the degree of supercooling of the absorbing liquid becomes higher, and the absorbing capacity is further improved.

(6) Sixth Problem Solving Means Sixth problem solving means of the present invention is the configuration of the first, second, third, fourth, or fifth problem solving means, wherein each of the generator and the absorber. A solution distributor is incorporated in the upper part of the plate part so that the solution is evenly distributed to the plate part, and the solution heat exchanger is filled with a concentrated solution that has been concentrated by generating refrigerant vapor. The outlet of the concentrated solution is provided in the upper part of the solution heat exchanger so as to flow out in a state.

  According to such a configuration, the liquid film and the diffusibility of the solution in each plate portion of the generator and the absorber are improved, and the uniformity of the liquid level is increased. Further, a concentrated solution pool is formed in the solution heat exchanger portion, and the heat exchange performance with the dilute solution is improved.

(7) Seventh Problem Solving Means The seventh problem solving means of the present invention is the above generator in the first, second, third, fourth, fifth or sixth problem solving means. While the distance between the plate parts where the solution flows from the solution heat exchanger to the lower solution heat exchanger is substantially the same, the distance between the heated fluid flow path of the upper generator and the heated solution flow path of the lower solution heat exchanger The pitch is different from the interval, and the pitch is substantially the same as the solution flow path of the evaporator and the absorber.

  According to such a configuration, first, in the former case, the generator part and the solution heat exchanger part can be formed easily and in a space-saving manner on the upper side and the lower side of one plate part. In the latter case, the volumes of the dilute solution flow path and the concentrated solution flow path in the solution heat exchanger section are equal, and the heat exchange performance between the dilute solution and the concentrated solution can be ensured to the maximum level. As a result, more efficient operation is possible.

(8) Eighth Problem Solving Means An eighth problem solving means of the present invention is the above generator in the first, second, third, fourth, fifth or sixth problem solving means. To the lower solution heat exchanger, evaporator and absorber, the distance between the solution passage flowing down from the upper portion and the heated solution flow passage flowing into the lower solution heat exchanger and the solution passage passage of the evaporator and absorber Are characterized by substantially the same pitch.

  According to such a configuration, the generator part, the solution heat exchanger part, the evaporator and the absorber part can be formed easily and in a space-saving manner on the upper side and the lower side of the one or two plate parts, respectively.

  Moreover, the volume of the flow path in each part of the heat exchanger becomes equal, and the heat exchange performance can be secured at the maximum level. As a result, more efficient operation is possible.

  Moreover, formation of each channel | path becomes easy.

  As a result, according to the present invention, the absorption refrigeration apparatus can be provided at low cost and in a compact manner.

(Best Embodiment 1)
First, FIG.1 and FIG.2 has shown the structure of the absorption refrigeration apparatus based on the best Embodiment 1 of this invention.

  In this embodiment, in order to make each heat exchanger such as a generator, a solution heat exchanger, an evaporator, and an absorber as integral as possible, the generator in the plate portion of one plate The number of plates required was made the same by appropriately setting each heat transfer area so that the exchange heat quantity of the solution and the exchange heat quantity of the solution heat exchanger, and the exchange heat quantity in the evaporator and absorber were matched. It is characterized by.

  That is, in the absorption refrigeration apparatus of this embodiment, for example, in a lithium bromide single-effect absorption refrigeration apparatus including a generator 1, a solution heat exchanger 2, a condenser, an evaporator 3, an absorber 4, and the like ( In order to make the entire apparatus excluding the air-cooled condenser as an integral type, an aqueous solution of lithium bromide is adopted as the absorbing liquid and water is adopted as the refrigerant, as shown in FIG. The heat transfer areas of the generator 1 and the solution heat exchanger 2 in P and the heat amounts in the evaporator 3 and the absorber 4 are set appropriately so that the heat transfer areas of the generator 1 and the solution heat exchanger 2 match each other. Are stacked so that the number of plates P, P,... Finally superposed and integrated becomes the same number (in FIG. 2, the lower evaporator 3 and Although the absorber 4 is omitted, it is substantially the same in the front-rear direction. And it has a configuration).

  And in that case, between the space | interval between the plate parts (heat exchange part) 1a, 1a ... of the said generator 1, and the plate part (heat exchange part) 2a, 2a ... of the solution heat exchanger 2. The generator 1, the solution heat exchanger 2, the evaporator 3, and the absorber 4 are manufactured by a completely integrated plate by determining the plate interval so that the intervals of the evaporator 3 and the absorber 3 are the same. can do.

  1 is a hot water inlet to the generator 1, 1d is an outlet of the same hot water, 2c is an inlet of a dilute solution to the solution heat exchanger 2, 2d is an outlet of the dilute solution, 2e is the outlet of the concentrated solution from the solution heat exchanger 2 to the absorber 4 side, 3c is the inlet of the condensed refrigerant (water) from the condenser (not shown) to the evaporator 3, and 4c is from the solution heat exchanger 2. This is the inlet of the concentrated solution to the absorber 4.

  Then, between each of them, a flow path as shown in the figure and a connecting pipe are provided so that the concentrated solution from the generator 1 on the upper side naturally flows down to the solution heat exchanger 2 portion on the lower side. To do. Furthermore, by arranging the absorber 4 and the evaporator 3 in parallel at the lower part of the solution heat exchanger 2, the concentrated solution exiting the solution heat exchanger 2 is allowed to flow into the absorber 4 by a natural flow method, and its plate portion It is made to flow on the surface of 4a in a liquid film state.

  On the other hand, the refrigerant vapor is introduced into the plate portion 4a of the absorber 4 from the evaporator 3 arranged in parallel, and the water vapor as the refrigerant vapor is efficiently absorbed into the concentrated solution in the same liquid film state. . The evaporator 3 is supplied with the refrigerant liquid from the generator 1 condensed via a condenser (not shown), and is evaporated by the refrigerant flowing through the internal refrigerant passage 3b at the plate portion 3a.

  According to such a configuration, the heat exchangers constituting the absorption refrigeration cycle can be integrated with each other to form a single plate structure heat exchanger as a whole. It is possible to reduce the size and cost.

  According to such a configuration, the plate part (heat exchange part) of each heat exchanger is arranged so that the number of generators, solution heat exchangers, absorbers, evaporators, etc. are equal to each other and the number of plates is the same. ), The plurality of plates can be integrated relatively easily.

  In addition, as an absorber cooling method, an indirect (solution separation cooling) air cooling method is adopted in which the absorbing solution flowing into the absorber is removed by sensible heat of the supercooled solution in the air cooling cooler (air cooling solution heat exchanger). By doing so, it is possible to form an absorption refrigeration cycle only with a total of three heat exchangers including an air-cooled condenser and an air-cooled cooler (air-cooled solution heat exchanger) as a whole.

  In this case, if the air-cooled condenser and the air-cooled cooler (air-cooled solution heat exchanger) are stacked in one, it is possible to make two heat exchangers as a whole, and the number of parts is greatly reduced. .

  As a result, as a whole, the heat exchanger can be configured with at least three or two heat exchangers, and the overall cost of the apparatus can be reduced and the size can be reduced, thereby greatly improving the reliability.

  In the above configuration, for example, as shown in FIG. 2, the interval between the plate portions 1a, 1a... Where the concentrated solution flows from the upper generator 1 to the lower solution heat exchanger 2 is substantially the same. On the other hand, the pitch of the interval between the heated fluid flow passages 1b, 1b... Of the upper generator 1 and the interval of the heated solution flow passages 2b, 2b. The pitches are substantially the same as the solution flow paths 3b, 3b... 4b, 4b.

  According to such a configuration, first, in the former case, the generator 1 part and the solution heat exchanger 2 part can be formed easily and in a space-saving manner on the upper side and the lower side of one plate P. In the latter case, the volumes of the dilute solution flow path and the concentrated solution flow path in the solution heat exchanger 2 are equal, and the heat exchange performance between the dilute solution and the concentrated solution can be ensured to the maximum level.

  Further, in the range from the upper generator 1 to the lower solution heat exchanger 2, the evaporator 3, and the absorber 4, a concentrated solution passage flowing from the upper portion and a heated solution flow passage flowing to the lower solution heat exchanger 2 are provided. The interval and the solution flow path of the evaporator 3 and the absorber 4 have substantially the same pitch.

  According to such a configuration, the generator 1, the solution heat exchanger 2, the evaporator 3, and the absorber 4 can be formed easily and in a space-saving manner on the upper side and the lower side of one or two plate portions, respectively. .

  Moreover, the volume of the flow path in each part of the heat exchanger becomes equal, and the heat exchange performance can be secured at the maximum level. As a result, more efficient operation is possible.

  Moreover, formation of each channel | path becomes easy.

(Modification)
3 and 4 show the configuration of a modification of the absorption refrigeration apparatus according to the first embodiment of the present invention.

  In this configuration, the evaporator 3 and the absorber 4 in the lower part of the absorption refrigeration apparatus configured by laminating the plurality of plates P, P,. The plate P forming the absorber and the plate P forming the absorber 4 are respectively formed in the lower part of different plates as shown in FIGS. 3 and 4 (the generator 1 and the solution heat exchanger 2 are the same). In addition, the heat shielding function of each other is ensured by partitioning in parallel in the stacking direction.

  When the heat transfer plate portions 3a and 4a of the evaporator 3 and the absorber 4 are formed in the width direction below the same plate P as shown in FIGS. 1 and 2, the slit S (see FIG. 1) is formed between them. However, as long as they are connected by a single plate, there is a limit to the heat shielding performance.

  However, as shown in FIG. 3 and FIG. 4, if each of them is formed on a separate plate and laminated (aligned) and integrated at different positions, such a problem is solved. In addition, the degree of freedom in setting the heat transfer area is increased.

  Other configurations are the same as those in FIGS. 1 and 2.

(Best Mode 2)
Next, FIG. 5 and FIG. 6 show the configuration of the absorption refrigeration apparatus according to the second embodiment of the present invention that is more specifically configured.

  Also in the absorption refrigeration apparatus of this embodiment, basically, the amount of exchange heat in the generator 1 determined from the absorption refrigeration cycle, the concentrated solution flowing out from the generator 1, and the rare heat flowing into the generator 1 The required number of plates P, P... Is made to coincide with the amount of heat exchanged with the solution and the amount of heat exchanged in the evaporator 3 and the absorber 4. Then, in that case, all the heat exchanger parts are completely formed on one plate, and the generator 1 is formed on the upper side of one plate P, and the solution heat exchanger 2 is formed on the lower side thereof. Further, the evaporator 3 and the absorber 4 are formed side by side in the width direction through the distribution trays 3g, 3g... 4g, 4g. , P ... are stacked and integrated as shown. It is.

  In the case of the same configuration, the diluted solution supplied from the absorber 4 (dilute solution outlet 4f) via the solution heat exchanger 2 (dilute solution inlet 2c, outlet 2d) is the plate portion of the generator 1. The surface of 1a, 1a ... flows down from above in a liquid film state and heated by a heating fluid such as hot water flowing through the heating fluid passages 1b, 1b ... in the plate portions 1a, 1a ... Then, the refrigerant vapor is concentrated to generate a refrigerant vapor, and the refrigerant vapor is supplied to a condenser (not shown) to be condensed, and further supplied to the evaporator 3. On the other hand, the concentrated absorption solution concentrated by the generation of the refrigerant vapor flows into the generator 1 through the inner dilute solution passages 2b, 2b ... in the plate portions 2a, 2a ... of the lower solution heat exchanger 2. After cooling with a dilute solution, the temperature drops and then flows into the absorber 4.

  In the plate portions 4a, 4a,... Of the absorber 4, the concentrated solution is supplied into the evaporator 3 when flowing down in a liquid film state, and the inside of the plate portions 3a, 3a,. While absorbing the refrigerant vapor from the condenser evaporated by the cold water flowing in the fluid passages 3b, 3b... (Cold water inlet 3d, outlet 3e), the generated heat is absorbed by the plate portions 4a, 4a of the absorber 4. ... the cooling fluid passages 4b, 4b ... (inlet 4d, outlet 4e) are removed by the cooling water flowing out from the lower dilute solution outlet 4f, and again the solution heat exchanger 2 To the dilute solution inlet 2c.

  5, reference numeral 2d other than the above is a dilute solution outlet from the solution heat exchanger 2, and the dilute solution outlet 2d is a dilute solution distribution on the plate portions 1a, 1a,. It is in contact with a tray (not shown).

  2e is a concentrated solution outlet from the solution heat exchanger 2, and the concentrated solution outlet 2e is an abbreviation of the solution heat exchanger 2 so that the concentrated solution flows out in a full state as shown in the figure. It is provided at the top.

  As a result, a concentrated solution pool is formed in the solution heat exchanger 2 portion, and the heat exchange performance with the dilute solution supplied from the absorber 4 is improved.

  Even with such a configuration, it is possible to realize exactly the same operation as that of the configuration of the best embodiment 1, and the generator 1 and the solution heat exchanger 2 side, and the evaporator 3 and the absorber 4 side are connected. Since the heat is vertically separated through the distribution trays 3g, 3g,..., 4g, 4g,.

  The distribution trays 3g, 3g,..., 4g, 4g,... Are in liquid-tight contact with each other as shown in FIGS. , So as not to enter the evaporator 3 and the absorber 4.

(Best Mode 3)
Next, FIG. 7 and FIG. 8 show the configuration of an absorption refrigeration apparatus employing an indirect (solution separation cooling) air cooling system according to the third preferred embodiment of the present invention.

  In this embodiment, as shown in FIGS. 7 and 8, for example, the plate portions 4a, 4a,... Of the absorber 4 in the configuration of the best embodiment 2 are replaced with cooling fluid passages 4b, 4b,. It is not a simple flat plate 41, 41..., And the absorption heat generated in the absorber 4 is cooled indirectly by an air cooling cooler (air cooling solution heat exchanger) 15 separate from the absorber 4 (solution separation). Cooling) It is characterized by adopting an air cooling system.

  In the expression on the drawing of FIG. 7, the upper generator 1 and the solution heat exchanger 2 are omitted, but the same parts are also shown in FIG. As described above, each plate P, P... Is constituted by a single-plate structure in which the plates are laminated and integrated and continue to the upper end side generator 1 portion.

  In such a configuration, as is understood from the circuit of FIG. 8, the dilute solution is supplied from the dilute solution outlet 4 f of the absorber 4 by the solution pump 11 to the first dilute solution supply path 12 a and the first dilute solution. In the dilute solution distribution tray 1g at the top of the plate portions 1a, 1a,... Of the generator 1 through the solution inlet 2c, the solution heat exchanger 2, the dilute solution outlet 2d, and the second dilute solution supply path 12b. It flows in from the second dilute solution inlet 1f.

  Then, the surface of the plate portions 1a, 1a,... Of the generator 1 flows down in a uniform liquid film state, and a heating fluid passage (hot water inlet 1c, hot water flow in the plate portions 1a, 1a,. The outlet 1d) is heated by a heating fluid such as warm water flowing through 1b, 1b,... To generate refrigerant vapor and is concentrated.

  The generated refrigerant vapor flows out of the refrigerant vapor outlet 1h and is supplied to the air-cooled condenser 9 through the refrigerant vapor supply path 13 to be condensed. The condensed refrigerant condensed in the air-cooled condenser 9 is supplied into the evaporator 3 through the refrigerant inlet 3c and the refrigerant distribution tray 3g, and the cooling fluid in the plate portions 3a, 3a,. The refrigerant flowing in the passages 3b (refrigerant inlet 3d, refrigerant outlet 3e), 3b... Is evaporated to generate refrigerant vapor.

  On the other hand, the concentrated solution concentrated in the generator 1 is cooled by the low-temperature dilute solution flowing into the generator 1 in the lower solution heat exchanger 2 and the temperature is lowered. The concentrated solution outlet 2e is allowed to flow into the concentrated solution distribution tray 4g of the plate portion 4a of the absorber 4 via the concentrated solution supply channel 12c via the concentrated solution inlet 4c.

  In this embodiment, the concentrated solution distribution tray 4g is supplied with a dilute solution supercooled by an air cooling cooler (air cooling solution heat exchanger) 15 separately provided in the dilute solution circulation path 12d. The concentrated solution is mixed with the diluted solution supercooled by the same air-cooled cooler (air-cooled solution heat exchanger) 15 in the concentrated solution distribution tray 4 g and flows into the absorber 4. As an example, a plurality of plate portions 4a, 4a,... Of the absorber 4 are provided with liquid film diffusing means such as punching holes, dimples, and meshes on the surface thereof, and can be formed into droplets together with liquid film formation. It has become.

  Then, when flowing down on the wide plate surface in a droplet state and a liquid film state, the refrigerant vapor evaporated by the evaporator 3 is efficiently absorbed to become a dilute solution, and again the dilute solution outlet 4f below the absorber 4. More leaked.

  Even in such a configuration, as in the case described above, the heat exchangers constituting the absorption refrigeration cycle can be integrated into a single plate type heat exchanger as a whole. Therefore, further downsizing and cost reduction are possible.

  The absorber of a conventional general air-cooled absorption refrigeration apparatus is composed of a plurality of heat transfer tubes having a large number of heat transfer fins and an absorbing solution distribution tray, and a refrigerant circulation pump provided in the solution circulation path The absorbent solution (concentrated solution) is allowed to flow through the refrigerant passage in the heat transfer tube of the absorber through the refrigerant, and the refrigerant solution from the evaporator side is absorbed in the solution passage portion, while the absorption solution is cooled by the fan cooling air around the heat transfer tube This is a direct air-cooling method that uses air-cooled fins that are cooled by air.In the absorber, it is important to expand the gas-liquid interface to simultaneously absorb the refrigerant vapor and cool the absorbing solution. Is big.

  For example, the space in the header section of the upper and lower absorbers including the absorbent solution distribution tray, the use of a large-diameter pipe for consideration of vapor pressure loss, and the connection pipe with the evaporator becoming thick due to the restriction of the flow rate of the refrigerant vapor is there.

  Moreover, since there exists a connection location by welding also in terms of cost, it is particularly expensive in a small machine.

  On the other hand, for example, as shown in FIG. 8, the dilute solution flowing into the absorber 4 through the dilute solution circulation path 12d by the solution pump 11 is transferred to the heat transfer tubes 15a, 15a..., The heat transfer fins 15b, 15b. ... By supercooling with an air cooling cooler (air cooling solution heat exchanger) 15 comprising a fan F or the like, only the refrigerant vapor is absorbed in the absorber 4, and the absorbed heat generated during absorption is supercooled. If the indirect (solution separation cooling) air cooling method is used, in which the absorbed solution is removed by sensible heat, the absorber 4 is reduced in size so that no cooling means is required. Then, it becomes especially advantageous.

  Therefore, as described above, in the absorption refrigeration apparatus having a single plate structure as a whole as in the best embodiment 1, such an indirect (solution separation cooling) air cooling system is adopted, and the absorber If the absorption solution of the refrigerant vapor is promoted by flowing the supercooled absorption solution in the liquid film state (and droplet state) through the plate portion 4a of FIG. 4, the air cooling condenser 9 and the air cooling cooling as shown in FIG. The absorption refrigeration cycle can be formed with only a total of three heat exchangers (air-cooled solution heat exchangers) 15, and it is possible to realize an absorption refrigeration apparatus that is highly efficient, compact, and low in cost. Become.

  In this case, for example, when one air-cooling condenser 9 and an air-cooling cooler (air-cooling solution heat exchanger) 15 shown in FIG. In this case, the number of parts is further greatly reduced.

  In the configuration of FIG. 8, a refrigerant distribution tray 3g is also provided above the plate portions 3a, 3a,... Of the evaporator 3 configured in the same manner as in the first and second embodiments. The condensed refrigerant from the above-described air-cooled condenser 9 is supplied to the refrigerant distribution tray 3g through the refrigerant inlet 3c.

  In the case of this embodiment, a refrigerant such as R407C is used in the refrigerant passages 3b, 3b... In the plate portions 3a, 3a. ing.

(Modification)
In the above embodiment, as shown in FIG. 8, when the cooling liquid supplied to the absorber 4 is supercooled through the air cooling cooler (air cooling solution heat exchanger) 15, the air cooling cooler (air cooling solution heat) is used. The dilute solution after being supercooled by the exchanger 15 is mixed with the concentrated solution from the solution heat exchanger 2 side in the absorption liquid distribution tray 4 g. The solution and the dilute solution from the absorber 4 may be mixed in advance, and the mixed solution may be supplied to the same air-cooled cooler (air-cooled solution heat exchanger) 15 and supercooled.

  According to such a configuration, the degree of supercooling of the absorption liquid is further increased, and the absorption capacity of the absorber 4 is further improved.

  On the other hand, in the former case, since the flow rate of the solution flowing in the air-cooled cooler (air-cooled solution heat exchanger) 15 is relatively small, there is an advantage that the heat exchanger can be made smaller correspondingly.

(Other embodiments)
In the above embodiment, a single effect absorption refrigeration apparatus (water cooling / indirect air cooling) employing lithium bromide as an absorbing liquid and water as a refrigerant has been described as an example. However, the present invention further includes multiple effects such as double effects. The same applies to the case of the mold absorption refrigeration apparatus.

  In that case, for example, the above-described solution heat exchanger 2 can be configured as a low-temperature solution heat exchanger.

It is a figure which shows the structure of the absorption refrigeration apparatus which concerns on best Embodiment 1 of this invention. It is a longitudinal cross-sectional view (lower part is abbreviate | omitted) of the principal part of the apparatus. It is a figure of the evaporator installation side plate part which concerns on the modification of the apparatus. It is a figure of the absorber installation side plate part which concerns on the same modification of the apparatus. It is a partially notched perspective view which shows the structure of the absorption refrigeration apparatus which concerns on best Embodiment 2 of this invention. FIG. It is a partially notched perspective view which shows the structure of the evaporator and absorber part of the absorption refrigeration apparatus which concerns on best Embodiment 3 of this invention. It is a figure which shows the whole structure of the apparatus.

Explanation of symbols

  1 is a generator, 2 is a solution heat exchanger, 3 is an evaporator, 4 is an absorber, and 15 is an air-cooled cooler (air-cooled solution heat exchanger).

Claims (8)

  An absorption refrigeration apparatus comprising a generator, a solution heat exchanger, a condenser, an evaporator, and an absorber, the amount of exchange heat in the generator determined from the absorption refrigeration cycle, and the concentration flowing out of the generator From the amount of exchange heat between the solution and the dilute solution flowing into the generator, and the amount of exchange heat in the evaporator and absorber, the generator is placed on the top of one plate so that the required number of plates matches. An absorption refrigeration apparatus, wherein a solution heat exchanger is formed at a lower portion, an evaporator and an absorber are formed at a lower portion of the solution heat exchanger, and a plurality of the plates are laminated and integrated.   An absorption refrigeration apparatus comprising a generator, a solution heat exchanger, a condenser, an evaporator, and an absorber, the amount of exchange heat in the generator determined from the absorption refrigeration cycle, and the concentration flowing out of the generator From the amount of exchange heat between the solution and the dilute solution flowing into the generator, and the amount of exchange heat in the evaporator and absorber, the generator is placed on the top of one plate so that the required number of plates matches. A solution heat exchanger is formed at the bottom, and an evaporator is formed at the bottom of the solution heat exchanger. On the other plate, the generator is formed at the top, the solution heat exchanger at the bottom, and the solution heat exchanger. An absorption refrigeration apparatus characterized in that an absorber is formed in the lower part, and a plurality of these plates are laminated and integrated in a state of being arranged in parallel.   The dilute solution flows down the plate part of the generator in a liquid film state, and is heated and concentrated by the heating fluid flowing inside the plate part to generate refrigerant vapor, while the concentrated solution that has become thicker by generating refrigerant vapor is After cooling with a dilute solution flowing into the generator in the lower solution heat exchanger, it flows into the absorber and absorbs the refrigerant vapor evaporated by the evaporator when flowing down the plate portion of the absorber in a liquid film state The absorption refrigeration apparatus according to claim 1 or 2, wherein the absorption heat generated at the time of absorption of the refrigerant vapor is removed by a cooling fluid flowing inside the plate portion.   The dilute solution flows down the plate part of the generator in a liquid film state, and is heated and concentrated by the heated liquid flowing inside the plate part to generate refrigerant vapor, while the concentrated solution that has become thicker by generating refrigerant vapor is After cooling with the dilute solution flowing into the generator in the lower solution heat exchanger, it is mixed with the dilute solution that is separately supercooled by the air-cooled solution heat exchanger and flows into the absorber, and flows down the plate part of the absorber The absorption refrigeration apparatus according to claim 1 or 2, wherein the absorption refrigeration apparatus is configured to absorb the refrigerant vapor evaporated by the evaporator.   The dilute solution flows down the plate part of the generator in a liquid film state, and is heated and concentrated by the heated liquid flowing inside the plate part to generate refrigerant vapor, while the concentrated solution that has become thicker by generating refrigerant vapor is After cooling with the dilute solution flowing into the generator in the lower solution heat exchanger, it is mixed with the dilute solution flowing separately into the air-cooled solution heat exchanger, and the mixed concentrated solution and dilute solution are mixed by the air-cooled solution heat exchanger. 3. The refrigerant according to claim 1, wherein the refrigerant vapor is introduced into the absorber after being supercooled, and absorbs the refrigerant vapor evaporated by the evaporator when flowing down the plate portion of the absorber. Absorption refrigeration equipment.   A solution distribution device is incorporated in the upper part of each plate part of the generator and the absorber so that the solution is evenly distributed to the plate part, and the solution heat exchanger generates a refrigerant vapor and is concentrated. 6. The outlet of the concentrated solution is provided at the upper part of the solution heat exchanger so that the concentrated solution flows out in a full state. Absorption refrigeration equipment.   While the distance between the plate parts where the solution flows from the upper generator to the lower solution heat exchanger is substantially the same, the distance between the heating fluid flow path of the upper generator and the heated part of the lower solution heat exchanger The absorption according to claim 1, 2, 3, 4, 5 or 6, wherein the pitch is different from the interval of the solution flow passages and the pitch is substantially the same as the solution flow passages of the evaporator and the absorber. Type refrigeration equipment.   From the upper generator to the lower solution heat exchanger, evaporator and absorber, the distance between the solution passage flowing down from the upper portion and the heated solution flow passage flowing into the lower solution heat exchanger and the evaporator and absorber The absorption refrigeration apparatus according to claim 1, 2, 3, 4, 5 or 6, wherein the pitch is substantially the same as the solution flow passage.

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