JPH0518634A - Absorption refrigerating apparatus - Google Patents

Abstract

PURPOSE:To increase a contact area and to increase heat-exchange efficiency by a method wherein a chamber comprised of a bellows fin is provided and a material effecting heat-exchange with the interior of the chamber performs heat-exchange through a sheet. CONSTITUTION:Cooling water 53 flows in the one chamber, comprised of a side plate 51 and a bellows fin 1, through a cooling water inlet 52 and the cooling water 53 flows out through a cooling water outlet 54 disposed thereabove. At the same time when a concentrated solution 55 flowing from a low temperature reproducer 23 through a low temperature heat-exchanger 28 is dripped in the other chamber from above, refrigerant steam flowing from a vaporizer 25 flows in. As a result, through heat-exchange of the concentrated solution 55 with the refrigerant steam through the sheet of the bellows fin 1, the solution and the refrigerant steam are cooled and a refrigerant is dissolved in the concentrated solution 55 to produce a dilution solution. In this case, since there is a need to improve wetness of the surface of the bellows fin 1, there is a need to roughen surface coarseness through knurling process by sand blast or rolling processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly to an absorption refrigerating machine in which heat exchange efficiency of a portion requiring heat exchange is improved and the size thereof is reduced.

[0002]

2. Description of the Related Art Conventionally, a pipe-shaped coil is provided in each container in a portion of an absorption refrigerator that requires heat exchange, such as an evaporator, an absorber, a condenser, and a low temperature regenerator.
Heat was exchanged between the solution or gas passing through the coil and the gas or solution introduced outside the coil.

[0003]

However, in such a part of the conventional absorption refrigerating machine in which heat exchange is required, heat exchange is carried out via a pipe-shaped coil, and a solution and gas or solution to be heat exchanged. There was a drawback that the contact between them was not sufficient and a satisfactory heat exchange efficiency could not be obtained. Further, since the pipes are arranged in a coil shape, the size of the apparatus becomes large and the degree of freedom in element layout is impaired.

The present invention has been made to solve the above problems, and its object is to improve the heat exchange efficiency in a portion of the absorption refrigerator where heat exchange is required, and to reduce the size and weight of the apparatus. It is possible to provide an absorption refrigerating machine capable of increasing the degree of freedom of element layout.

[0005]

In the absorption refrigerator according to the present invention which has achieved the above object, at least one of an evaporator, an absorber, a condenser and a low temperature regenerator is processed by continuously bending a thin plate. The heat exchanger includes a corrugated fin having a corrugated shape and a seal plate that seals a chamber formed by the peaks and valleys of the corrugated fin with an end surface.

[0006]

According to the above-mentioned structure, a portion requiring heat exchange, for example, circulating water (cold water) and a refrigerant liquid flowing in the evaporator are corrugated bellows fins formed by continuous bending of a thin plate and peak portions of the bellows fins. As a result, the chambers formed by the valleys and the valleys flow in mutually opposite directions, the contact area increases dramatically, and the heat exchange efficiency between the cold water and the refrigerant liquid improves.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 shows an outline of an absorption refrigerator in which the present invention is implemented.
Will be described. A high temperature regenerator (regenerator) 21 has a combustion chamber housed therein, heats a dilute solution that has absorbed a refrigerant and becomes thin, and generates a refrigerant vapor from the dilute solution. A separator 22 removes the refrigerant vapor. The refrigerant vapor is separated from the intermediate concentrated solution that has been evaporated to increase the concentration. Low temperature regeneration period (regenerator) 2
3 reheats the intermediate concentrated solution whose temperature has been lowered by the high-temperature heat exchanger 27 with the refrigerant vapor coming from the separator 22 to further generate the refrigerant vapor from the intermediate concentrated solution to form a concentrated solution, and from the separator 22 Part of the incoming refrigerant vapor is condensed into a refrigerant liquid. The condenser 24 cools and liquefies the refrigerant vapor generated in the low temperature regenerator 23 and the refrigerant vapor that has not become the refrigerant liquid in the low temperature regenerator 23 with the cooling water flowing in the pipe to become the refrigerant liquid.
The evaporator 25 is provided with a heat transfer tube (cooler) 25A through which circulating water to be cooled flows, and the condenser 2 is connected to the heat transfer tube 25A.
The refrigerant liquid coming from No. 4 is sprayed, and the circulating water is cooled by utilizing the heat of vaporization when the refrigerant liquid becomes the refrigerant vapor. The absorber 26 is sprayed with the concentrated solution coming from the low-temperature regenerator 23, and this concentrated solution absorbs the refrigerant vapor vaporized in the evaporator 25. A high vacuum is secured in the evaporator 25 by the absorbing action of the absorber 26, and the refrigerant liquid sprinkled on the heat transfer tubes 25A in the evaporator 25 can be immediately evaporated. The high-temperature heat exchanger 27 exchanges heat between the high-temperature intermediate concentrated solution and the low-temperature diluted solution, and the low-temperature heat exchanger 28 exchanges heat between the high-temperature concentrated solution and the low-temperature diluted solution. They are installed in two stages to improve heat exchange efficiency. Solution circulation pump 29
Is provided to circulate the dilute solution that has absorbed the refrigerant vapor.

The present invention relates to the absorption refrigerator shown in FIG. 2, for example, the evaporator 25, the absorber 26, the condenser 24, the low temperature regenerator 2
As shown in FIG. 1, a thin plate having good heat conductivity is continuously bent to form a corrugated bellows fin 1, and the peak portion of the bellows fin 1 is used. Seal plates 4 and 5 are provided so as to seal the end faces in order to secure a chamber formed by 2 and the valley portion 3 and are integrated to form a heat exchanger. In FIG. 1, the bellows fin 1 and the seal plates 4 and 5 are shown in a disassembled perspective view.

FIG. 3 shows an example in which the heat exchanger is used in the evaporator 25. FIG. 3 (a) is a view when the heat exchanger is placed vertically in the vertical direction, and FIG. It is a figure. In FIG. 3, one closed chamber formed by the side plate 31 and the bellows fin 1 is provided with circulating water (cold water) 33 from a cold water inlet 32.
Flows in, and the cold water flows out from the cold water outlet 34 arranged above it. On the other hand, in the other chamber, the refrigerant liquid 35 coming from the condenser 24 is dripped from above, and the refrigerant liquid 35
The cold water 33 is cooled by utilizing the heat of vaporization when the gas becomes a refrigerant vapor. In this case, the surface of the bellows fin 1 needs to be roughened by sandblasting in order to improve its wettability. In order to improve the wettability, the surface roughness may be roughened by knurling by rolling.

FIG. 4 shows an example in which the heat exchanger is also used in the evaporator 25. FIG. 4 (c) is a diagram showing the heat exchanger arranged horizontally, and FIG. 4 (d) is a sectional view thereof. . In FIG. 4, cold water 43 flows from a cold water inlet 42 into one closed chamber formed by the bottom plate 41 and the bellows fins 1,
The cold water 43 flows out and circulates from a cold water outlet 44 formed on the other side of the bottom plate 41. On the other hand, the other chamber is formed above the passage of the cold water 43, and the refrigerant liquid 45 coming from the condenser 24 flows in from the refrigerant inlet 46, pools the refrigerant liquid 45, and boils to become refrigerant vapor. Cooling the cold water 43 using the heat of vaporization at this time is the same as in the case of FIG.

In the case of FIG. 4, unlike the case of FIG. 3, it is not necessary to distribute and drop the refrigerant liquid over the entire surface of the fin, and the method of heat exchange is simplified.

FIG. 5 shows an example in which the absorber 26 is used. FIG. 5 (e) is a diagram when it is placed vertically in the vertical direction.
(F) is the AA arrow line view, (g) is a figure when it sees from B direction, and is a partially broken sectional view. In FIG. 5, the cooling water 53 flows from a cooling water inlet 52 into one closed chamber formed by the side plate 51 and the bellows fin 1, and the cooling water 5 flows from a cooling water outlet 54 disposed above the cooling water 53.
3 flows out. On the other hand, the low temperature regenerator 2 is provided in the other chamber.
The concentrated solution 55 coming from 3 through the low temperature heat exchanger 28 is dropped from above, and at the same time, the refrigerant vapor coming from the evaporator 25 flows in. As a result, the concentrated solution 55 and the refrigerant vapor exchange heat with each other through the thin plate of the bellows fin 1, both of them are cooled, and the refrigerant is dissolved in the concentrated solution 55 to become a dilute solution. In this case also, it is necessary to improve the wettability of the surface of the bellows fin 1, and it is necessary to roughen the surface roughness by knurling by sandblasting or rolling.

FIG. 6 shows an example in which the condenser 24 is used. FIG. 6 (h) is a diagram when it is placed vertically in the vertical direction.
(I) is a perspective view of the disassembled case. In FIG. 6, the cooling water 63 flows from the cooling water inlet 62 into one sealed chamber formed by the side plate 61 and the bellows fin 1, and the cooling water 6 flows from the cooling water outlet 64 disposed above the cooling water 63.
3 flows out. On the other hand, the refrigerant vapor coming from the low temperature regenerator 23 is sealed from the upper side in the other chamber formed by the side plate 65 and the bellows fins 1 and flows downward. As a result, it is cooled by exchanging heat with the cooling water 63 through the thin plate of the bellows fin 1, becomes a refrigerant liquid, and flows out from the refrigerant liquid outlet 66 arranged below.

FIG. 7 shows an example of use in the low temperature regenerator 23, (j) is a diagram when it is arranged horizontally in the low temperature regenerator, and (k) is a sectional view thereof. In FIG. 7, the refrigerant vapor 73 separated by the separator 22 flows into the one closed chamber formed by the bottom plate 71 and the bellows fin 1 of the low temperature regenerator 23 from the refrigerant vapor inlet 72 and passes through the bellows fin 1. In the meantime, it exchanges heat with the intermediate concentrated solution through the thin plate, and is cooled and part of it becomes a refrigerant liquid and flows out from the refrigerant liquid outlet 74. On the other hand, in the other chamber formed by the bellows fin 1, the intermediate concentrated solution 75 separated by the separator 22 and passing through the high temperature heat exchanger 27 flows in from the intermediate concentrated solution inlet 76,
While maintaining the liquid depth constant by the liquid level securing weir 77, heat is exchanged with the refrigerant vapor 73 in the portion of the bellows fin 1 to obtain heat to generate refrigerant vapor, and the intermediate concentrated solution becomes a concentrated solution and flows out from the concentrated solution outlet 78. To do. The refrigerant vapor generated from the intermediate concentrated solution flows out from the refrigerant vapor recovery port 80 provided in the outer frame 79. At that time, a droplet separation member 81 or the like may be provided on the outer frame 79 to collect the refrigerant vapor with high accuracy. In a heat exchanger of the type in which such an intermediate concentrated solution is pooled and boiled, it is desired to make the liquid depth determined by the liquid level securing dam 77 as shallow as possible in order to increase the heat exchange efficiency. Compared to the conventional coil-shaped pipe, the bellows-shaped fin can make the liquid depth shallower and the heat exchange efficiency can be dramatically increased.

When used in the low temperature regenerator 23, it may be arranged vertically as well as horizontally arranged as shown in FIG. For example, one of the chambers formed by the peaks and valleys of the bellows fins is closed, the refrigerant vapor is introduced from the upper part in the vertical direction and the refrigerant liquid is collected from the lower part, and the other chamber is closed and the middle part is inserted from the upper part. After the concentrated solution is dropped and the refrigerant vapor is boiled and evaporated, the concentrated solution may be recovered from below.

The bellows fin, which is obtained by continuously bending the thin plate into a corrugated shape, and the seal plate for sealing the peak and valley chambers of the bellows fin at the ends, are assembled in advance and the brazing method in the furnace is used. To join to produce a heat exchanger.
This reduces the size and weight of the device and increases the degree of freedom in element layout.

[0017]

As described above, according to the present invention, the chamber formed by the bellows fins is provided, and the substances exchanging heat in the chamber exchange heat through the thin plates, so that the contact area is increased. Can be increased and the heat exchange efficiency can be increased. Further, since the thin plate is manufactured by continuous bending, it is easy to process, and at the same time, the device can be made smaller and lighter and the degree of freedom in element layout can be increased as compared with the conventional pipe having a coil shape.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a system diagram of an absorption refrigerator to which the present invention can be applied.

FIG. 3 is a diagram when the present invention is applied to an evaporator.

FIG. 4 is a diagram of another embodiment when the present invention is applied to an evaporator.

FIG. 5 is a diagram when the present invention is applied to an absorber.

FIG. 6 is a diagram when the present invention is applied to a condenser.

FIG. 7 is a diagram when the present invention is applied to a low temperature regenerator.

[Explanation of symbols]

1 bellows fin 4,5 seal plate 21 High temperature regenerator 22 Separator 23 Low temperature regenerator 24 condenser 25 evaporator 26 absorber 27 High temperature heat exchanger 28 low temperature heat exchanger

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshitaka Matsushima             1370 Koyasu Town, Hamamatsu City, Shizuoka Prefecture Yazaki General Stock Company             In-house

Claims (7)

[Claims] 1. A high temperature regenerator for heating a dilute solution with a heating source, a separator for separating the solution heated by the high temperature regenerator into a refrigerant vapor and an intermediate concentrated solution, and an intermediate concentrated solution from the separator. A high temperature heat exchanger for exchanging heat with a dilute solution, and an intermediate concentrated solution whose temperature has been lowered by the high temperature heat exchanger is reheated by a refrigerant vapor coming from the separator to generate a refrigerant vapor from the intermediate concentrated solution to generate a concentrated refrigerant vapor. A low temperature regenerator as a solution, a condenser that liquefies the refrigerant vapor generated in the low temperature regenerator into a refrigerant liquid by cooling,
An evaporator for spraying the liquid refrigerant from the condenser onto a chiller to obtain chilled water from the chiller, and a concentrated solution for heat exchange from the low temperature regenerator through a low temperature heat exchanger to the evaporator. In the absorption refrigerating machine having an absorber for absorbing the vaporized refrigerant vapor in step S1 and a solution circulation pump for sending the diluted solution absorbing the refrigerant in the absorber to the high temperature regenerator via a heat exchanger, the evaporator , At least one of the absorber, the condenser, and the low-temperature regenerator is formed by continuous bending of a thin plate, and a chamber formed by the corrugated fin and the peaks and valleys of the corrugated fin is sealed at the end surface. An absorption refrigerator comprising a heat exchanger composed of a seal plate for 2. The evaporator according to claim 1, wherein when the evaporator is constituted by the heat exchanger, one of the chambers formed by the peaks and valleys of the bellows fin is closed, and cold water is introduced from below in the vertical direction. And the refrigerant liquid is dripped into the other chamber from above the bellows fins. 3. The evaporator according to claim 1, wherein when the evaporator is constituted by the heat exchanger, the bellows fins are arranged horizontally, the refrigerant liquid flows into the vertically upper chamber, and the lower chamber is closed. An absorption chiller characterized by allowing cold water to flow therethrough. 4. In claim 1, when the absorber is constituted by the heat exchanger, one of the chambers formed by the peaks and valleys of the bellows fins is closed and cooling water is introduced from below in the vertical direction. The absorption chiller is characterized in that the concentrated solution is dropped from above the bellows fin into the other chamber and the refrigerant vapor can pass therethrough. 5. When the condenser is constituted by the heat exchanger according to claim 1, one of the chambers formed by the peaks and valleys of the bellows fins is closed and cooling water is introduced from below in the vertical direction. And the other chamber is also closed so that the refrigerant vapor flows in from above and the refrigerant liquid is recovered from below. 6. The low temperature regenerator according to claim 1, wherein when the low temperature regenerator is constituted by the heat exchanger, the bellows fins are arranged horizontally.
The chamber in the lower part in the vertical direction is closed, and the refrigerant vapor is allowed to flow in and the refrigerant liquid is recovered from the outlet, while the intermediate concentrated solution is introduced into the chamber in the upper part, and the refrigerant vapor is generated and then recovered as the concentrated solution. The absorption refrigerating machine characterized in that 7. The low-temperature regenerator according to claim 1, wherein when the low-temperature regenerator is constituted by the heat exchanger, one of the chambers formed by the peaks and valleys of the bellows fins is closed, and the refrigerant vapor is introduced from above in the vertical direction. The refrigerant liquid is allowed to flow in from the lower part, and the other chamber is also closed, and the intermediate concentrated solution is dropped from the upper part to form a liquid film and evaporate by boiling to generate the refrigerant vapor, and then the concentrated solution is recovered from the lower part. The absorption refrigerating machine characterized in that