JP3522443B2 - Plate type condenser for absorption refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a plate type condenser used in an absorption refrigerator.

[0002]

2. Description of the Related Art FIG. 1 is a system diagram for explaining the principle of an absorption refrigerator 1. In the regenerator 2, the rare absorbent 3 is heated by a heating source, for example, city gas, and the refrigerant vapor is separated to obtain a concentrated absorbent. The refrigerant vapor is cooled and condensed in the condenser 4 to become the refrigerant liquid 5. The refrigerant liquid 5 is decompressed by the decompression valve 6, the liquid to be cooled, for example, water is cooled by the evaporator 7, and the refrigerant liquid itself evaporates. The refrigerant vapor is absorbed by the regenerator 2 in the absorber 8 in order to keep the evaporator 7 at a reduced pressure and accelerate the evaporation of the refrigerant liquid.
It is absorbed by the concentrated absorbent from. The concentrated absorbing liquid absorbs the refrigerant vapor to become the diluted absorbing liquid 9, is pressurized by the solution pump 10, and is sent to the regenerator 2 via the heat exchanger 11. The concentrated absorption liquid 3 from the regenerator 2 is decompressed by the pressure reducing valve, and the heat exchanger 1
1 to the absorber 8. Since it is necessary to discharge heat to the outside when the absorbing liquid absorbs the refrigerant vapor and when the refrigerant vapor condenses, the cooling water flows from the absorber 8 to the condenser 4. The evaporator 7 is provided with a refrigerant pump 11, and the unevaporated refrigerant liquid 12 is circulated.

[0003] A typical condenser of the prior art is provided with a horizontal multi-tube cooling water pipe, the refrigerant vapor descends from the upper side to the lower side of the cooling water pipe to cool the refrigerant vapor, and the outer surface of the cooling water pipe. It becomes a refrigerant liquid by being condensed at. In order to improve the condensation efficiency of the condenser, it is necessary to increase the heat transfer area and promptly separate the refrigerant liquid from the outer surface of the cooling water pipe. In a horizontal multi-tube condenser, the condensed refrigerant liquid comes to drip on the cooling water pipe arranged below, and when the heat transfer area is increased, the number of cooling water pipes increases and the number of stages increases.
The refrigerant liquid must be removed from the cooling water pipe many times, and the condensation efficiency decreases. Further, there is a problem that the number of cooling water pipes increases and the condenser cannot be made compact.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact plate type condenser having a high condensation efficiency for use in an absorption refrigerator.

[0005]

According to the present invention, a regenerator for separating a refrigerant vapor from a dilute absorption liquid to obtain a concentrated absorption liquid, and a regenerator arranged in the refrigerant vapor to cool the refrigerant vapor to obtain the refrigerant liquid. Includes a condenser, an evaporator that evaporates the refrigerant liquid under reduced pressure to cool the liquid to be cooled, and an absorber that absorbs the refrigerant vapor generated in the evaporator with a concentrated absorbing liquid, and absorbs the absorbing liquid with the regenerator. In a plate type condenser of an absorption refrigerating machine that circulates through a heat exchanger to and from a container, a vertical condenser having unevenness extending in the vertical direction and having upper and lower portions 28, 29 and both side portions 23b, 23a closed. Two corrugated plates 22a and 22b are provided, and two corrugated plates 22 are provided.
A cooling water passage, through which cooling water is supplied from one side portion 23b and discharged from the other side portion 23a, is formed in the inside sandwiched between a and 22b, and the two corrugated plates 22a and 22b are provided with concave portions and convex portions. The core material 35 is arranged in the cooling water passage such that the core material 35 and the core material 35 are opposed to each other.
It extends between b and the other side part 23a, and is bent between the two corrugated plates 22a and 22b, and the core material 35 faces the concave portions of the two corrugated plates 22a and 22b. A plate-type condenser for an absorption chiller characterized in that a baffle plate (36) for restricting the flow of cooling water in the direction from the one side portion (23b) to the other side portion (23a) is provided. . According to the present invention, a plate-type condenser having two corrugated plates having vertical corrugations and having closed upper and lower portions and both side portions is used. Since it can be arranged vertically parallel to the flow direction (the direction from the top to the bottom of FIGS. 2 and 5 as described later, and the direction perpendicular to each paper surface of FIGS. 3 and 4), the refrigerant liquid condensed on the outer surface of the corrugated plate flows down. Easy to do. For this reason, the thickness of the refrigerant liquid film on the outer surface of the condenser, which becomes the heat transfer resistance, becomes thin, and the heat transmission coefficient can be improved. Also, the plate spacing (that is, the spacing between adjacent plate type condensers) is
It can be narrowed to about 14 mm, which is necessary for piping, and the heat transfer area can be increased by 20 to 30% in the same area as compared with a flat plate having the same length and width. With these, the size can be reduced to about 1/2 of the size of the conventional condenser of the horizontal multi-tube type.

Since the two corrugated plates face each other with the concave portion and the convex portion facing each other and the core material is arranged inside, the turbulent flow is caused in the flow of the cooling water to improve the heat transfer performance. it can. The core material also acts as a reinforcing material. The condenser has a large pressure difference inside and outside (for example, 0.1
Withstands atmospheric pressure, 6 to 8 atmospheres inside.

The material of the condenser is not particularly limited in the present invention, but is preferably made of metal having a high thermal conductivity, and it is also made of copper as in the case of the horizontal multi-tube cooling pipe in terms of processing. preferable. Further, the present invention is an absorption refrigerator in which the plurality of plate type condensers 21 described above are arranged adjacent to each other in the refrigerant vapor.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described more specifically by way of embodiments. The structure of the absorption refrigerator is the same as that described in the related art with reference to FIG.

FIG. 2 is a front view of the plate type condenser 21 of the present invention, and FIG. 3 is a plan view. Two corrugated plates 22a, 22b
Are provided so that the concave portions and the convex portions face each other, and the upper and lower portions 28 and 29 and both side portions 23a and 23b are closed. A cooling water outlet header 24 is formed near one side portion 23a, and a cooling water inlet header 25 is formed near the other side portion 23b. The cooling water that has cooled the absorber 8 is supplied from the cooling water supply pipe 26 to the cooling water inlet header 25.
Then, it is traversed between the two corrugated plates 22a and 22b from right to left, for example, and is guided from the cooling water outlet header 24 to the cooling water discharge pipe 27.

A plurality of condensers 21 are arranged in the vertical direction of FIG. 3 whose plane is shown, and the condensers 21 are provided in parallel to the flowing direction of the refrigerant vapor shown by the arrow 31 in FIG. 2, that is, vertically. In the case of the double effect, the size of the condenser 21 is, for example, width A = 665 mm and length B = 125 mm, and one sheet is 1R.
Used as a T (freezer ton) condenser. Therefore, for an absorption refrigerator of 100 RT, the condenser 21 is 1
00 sheets are arranged in the vertical direction of FIG.

FIG. 4 is a horizontal enlarged sectional view showing the shape of the corrugated plate used in the condenser 21 of the present invention. Two corrugated sheets 22
Cooling water flows laterally across the inner surfaces of a and 22b, for example, from the top to the bottom in FIG. 4 (that is, from the right to the left in FIG. 2). The condensed refrigerant liquid flows down perpendicularly to the paper surface of FIG.
1 from the lower portion 29 (see FIG. 2, later-described FIG. 5) of the refrigerant liquid reservoir 5
Drop on. Experiments were carried out on corrugated plates of various shapes to maximize the condensation efficiency, and the pitch P of corrugated plates was 2 to 5 mm,
Preferably 3-4 mm, wave depth h = 0.5-2 mm,
Preferably, it is 0.7 to 1.5 mm, and the mountain portion bending radius r = 0.
2 to 2 mm, preferably 1.0 mm was obtained.

As shown in FIG. 4, a core material 35 is provided in the cooling water passage so as to extend in the left-right direction in FIG. 2 (that is, between the side portions 23a and 23b in the up-down direction in FIG. 4). A baffle plate 36 is provided on the core member 35 at a portion facing each other. The baffle plate 36 restricts the flow of cooling water in the direction from right to left as described above with reference to FIG. Figure 5
FIG. 5 is a vertical cross-sectional view taken along the section line VV of FIG. 4. The core material 35 is bent in a corrugated shape between the corrugated plates 22a and 22b, whereby the convex portions of the corrugated plates 22a and 22b face each other and maintain the shape of the corrugated plates 22a and 22b.
The flow of the cooling water in the width direction (that is, the direction perpendicular to the paper surface of FIG. 2, the vertical direction of FIG. 3, and the horizontal direction of FIGS. 4 and 5) is restricted. The flow of the cooling water is restricted by the core material 35 and the baffle plate 36 and becomes a turbulent flow to increase the heat transfer efficiency.

Further, the absorber of the present invention can be designed to have one sheet per 1RT or one sheet per 2RT, and the cost can be reduced by mass production.

[0014]

As described above, according to the present invention, the size of the condenser of the absorption refrigerator can be reduced to about half, and the size of the absorption refrigerator can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a system diagram for explaining the principle of an absorption refrigerator 1.

FIG. 2 is a front view of a condenser 21 for an absorption refrigerator according to an embodiment of the present invention.

FIG. 3 is a plan view of the condenser 21.

4 is a horizontal enlarged cross-sectional view showing the relationship among corrugated plates 22a and 22b of the condenser 21, the core material 35, and the baffle plate 36. FIG.

5 is a vertical cross-sectional view taken along the section line VV of FIG.

[Explanation of symbols]

1 absorption refrigerator 2 regenerator 4 condenser 7 evaporator 8 absorber 21. Plate type condenser according to one embodiment of the present invention 22 corrugated board 23 Side 26 Cooling water supply pipe 27 Cooling water discharge pipe 35 heartwood 36 baffle

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-18634 (JP, A) JP-A-52-76508 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 39/00-39/04

Claims (2)

(57) [Claims] 1. A regenerator for separating a refrigerant vapor from a dilute absorption liquid to obtain a concentrated absorption liquid, a condenser arranged in the refrigerant vapor for cooling the refrigerant vapor to obtain the refrigerant liquid, and decompressing the refrigerant liquid. A heat exchanger between the regenerator and the absorber, which includes an evaporator that evaporates below and cools the liquid to be cooled, and an absorber that absorbs the refrigerant vapor generated in the evaporator with a concentrated absorbing liquid. In a plate type condenser of an absorption refrigerating machine that circulates through a pair of vertical corrugated plates 2 that have irregularities extending in the vertical direction and are closed at upper and lower parts 28, 29 and both side parts 23b, 23a.
2a and 22b are provided, and a cooling water passage through which cooling water is supplied from one side portion 23b and discharged from the other side portion 23a is formed inside the two corrugated plates 22a and 22b. Corrugated plates 22a and 22b are combined so that the concave portions and the convex portions face each other, and the core material 35 is arranged in the cooling water passage. The core material 35 is disposed between the one side portion 23b and the other side portion 23a. And is bent between the two corrugated plates 22a and 22b, and the core 35 is a portion where the concave portions of the two corrugated plates 22a and 22b face each other, and the one side portion of the cooling water. Baffle plate 36 for restricting flow in the direction from 23b to the other side portion 23a
A plate type condenser for an absorption refrigerating machine. 2. An absorption refrigerator, wherein a plurality of plate type condensers 21 according to claim 1 are arranged adjacent to each other in a refrigerant vapor.