JP2568802B2 - Absorption refrigeration apparatus and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating apparatus having a high-temperature regenerator and a low-temperature regenerator for an absorbent.

[0002]

2. Description of the Related Art An absorbing solution such as an aqueous solution of lithium bromide is heated by a heating source, boiled by a regenerator and separated into a solution (refrigerant) and an absorbing solution (a highly concentrated aqueous solution of lithium bromide). A high-temperature regenerator that boils the low-concentration absorbent with a heating source such as a burner as a regenerator, and a gas-liquid separator that separates the low-concentration absorbent boiled with the high-temperature regenerator into refrigerant vapor and medium-concentration absorbent, A low-temperature regenerator that is provided on the outer periphery so as to surround the gas-liquid separation unit and re-boils the medium-concentration absorbent using heat energy of the refrigerant vapor in the gas-liquid separator to separate the refrigerant and the high-concentration absorbent. 2. Description of the Related Art An absorption refrigerating apparatus provided with a refrigerating machine is known.

[0003]

However, in the absorption refrigerating apparatus employing the low-temperature regenerator as described above, the structure of arranging the cylindrical vessels of the apparatus in a multiplex manner requires a complicated structure at the bottom of each apparatus. Becomes Also, since the absorbing solution has a high corrosive power, even when a material with high corrosion resistance such as stainless steel is used as the material, the composition changes in the welded part of the member, the metal particles are coarsened, and the corrosion resistance is reduced. When corrosion occurs and progresses, there is a problem that the airtightness decreases over time.

An object of the present invention is to improve the airtightness of a bottom plate in an absorption refrigerating apparatus in which a cylindrical low-temperature regenerator is multiplexed on the outer periphery of a gas-liquid separator of a high-temperature regenerator comprising a cylindrical container. Simplification of the mechanical structure. The object of claim 2 is to
It is in facilitation of manufacturing. An object of the invention described in claims 3 and 4 is to enable connection of a thick pipe for supplying an absorbing liquid or a refrigerant to a bottom plate of each device.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a high-temperature regenerator for boiling a low-concentration absorbing liquid containing a refrigerant, a pumping pipe extending upward from the high-temperature regenerator, and an outer periphery of the pumping pipe. A refrigerant partition disposed therein, and a gas-liquid separation section including a container-shaped medium-concentration absorbent partition disposed on the outer periphery of the refrigerant partition, and a low-temperature regeneration disposed on the outer periphery of the intermediate-concentration absorbent partition. In the absorption refrigeration apparatus provided with a vessel, the gas-liquid separation section and the low-temperature regenerator are provided with a central disk portion provided with the liquid-pumping tube penetrating in a liquid-tight manner, and a lower portion from an outer periphery of the central disk portion. A small-diameter central cylindrical portion that is extended to the lower end of the refrigerant partition tube and is fitted water-tightly outside,
An intermediate cylindrical portion having a diameter extending downward from the outer periphery of the central cylindrical portion and having a lower end of the middle-concentration absorbing liquid partition tube fitted in a watertight manner,
In addition, the lower end of the outer peripheral wall of the low-temperature regenerator has an integrally formed bottom plate having a large-diameter outer cylindrical portion fitted outside in a watertight manner.

According to a second aspect of the present invention, there is provided a method of manufacturing an absorption refrigeration apparatus,
Sequentially, the fitting surface of the pumping tube to the central disk portion is welded, joined by brazing, or the like, the fitting surface of the lower end of the refrigerant partition tube and the central cylindrical portion is joined, and The fitting surface between the lower end of the partition tube and the intermediate cylindrical portion is joined, and the fitting surface between the lower end of the outer peripheral wall of the low-temperature regenerator and the outer cylindrical portion is joined. In claim 3 or claim 4, a tapered portion is provided in the cylindrical portion of the bottom plate, and a pipe is connected to the tapered portion.

[0007]

According to the present invention, since the bottom plates of the cascaded cylindrical containers are integrally formed, there are few joints such as welding and brazing on the bottom plate, and poor airtightness due to corrosion of the joints is eliminated. Can be reduced. In the configuration according to the second aspect, since the integrally formed bottom plate is set in a stepwise manner from the central portion toward the outer periphery, the fitting joint with the bottom end of each tubular container is located inside. Since work can be performed sequentially from the container, workability is excellent. According to the third or fourth aspect of the present invention, since the end of the pipe can be connected to the tapered portion, the mounting area of the pipe can be increased, the number of connection work can be reduced, and the flow resistance can be reduced by mounting a thick pipe. It is.

[0008]

1 shows an absorption refrigeration system 1 according to the present invention.
00 is shown. The absorption refrigeration apparatus 100 includes a gas-liquid separation unit 2 above a high-temperature regenerator 1 for heating and boiling a low-concentration absorption liquid with a gas burner B. A spherical shell-shaped ceiling is provided around the gas-liquid separation unit 2. A low-temperature regenerator 3 having a vertical annular cross-section having 31 is provided. An absorber 4 is provided around the low temperature regenerator 3.
, An evaporator 5 is provided on the outer periphery of the absorber 4, and a condenser 6 is provided above the evaporator 5. Absorbing liquid sprayer 7 is mounted above cooling coil 41 installed in absorber 4.
A liquid pump P is provided between the bottom of the absorber 4 and the high temperature regenerator 1.
Is interposed.

As shown in FIG. 2, the gas-liquid separator 2 and the low temperature regenerator 3 of the high temperature regenerator 1 are closed by an integrally formed bottom plate 8 formed by drawing a stainless steel plate. High temperature regenerator 1
Has an absorbing liquid heating tank 11 heated by a gas burner B, and the rising flow path L
The pumping pipe 12 forming 1 protrudes vertically. An upper pumping pipe 13 protruding into the gas-liquid separator 2 is connected to an upper end of the pumping pipe 12, and a baffle for facilitating gas-liquid separation is attached to an upper end of the upper pumping pipe 13. I have.

The gas-liquid separation section 2 comprises a refrigerant partition 21 disposed on the outer periphery of the upper liquid pumping tube 13 and a medium-concentration absorbing liquid partition 22 disposed on the outer periphery of the refrigerant partition 21. The outer peripheral wall 33 of the low-temperature regenerator 3
Are coaxially arranged. The bottom plate 8 has a large through-hole 81 with an upwardly projecting edge into which the upper end of the pumping pipe 12 is inserted and welded, and a medium-concentration absorption liquid discharge pipe 91 which is an inlet-side end of the medium-concentration absorption liquid supply passage L2. A central disk portion 80 is provided with a small through hole 82 having an upper protruding edge to be welded. A small-diameter central cylinder that extends downward from the outer periphery of the central disk portion 80, has the lower end of the refrigerant partition tube 21 fitted outside, and has a fitting surface joined by welding, brazing, or the like. A portion 83 and an intermediate tapered portion 84 which is expanded downward at a taper angle of approximately 60 degrees from the lower end of the central cylindrical portion 83 are provided.

In the intermediate tapered portion 84, a refrigerant discharge pipe 92 which forms an inlet portion of a refrigerant liquid supply passage L5 for connecting the condenser 6 between the refrigerant partition 21 and the medium-concentration absorbent partition 22.
Are inserted from below and joined. At the lower end of the intermediate taper portion 84, an intermediate cylindrical portion 85 having a diameter is formed, into which the lower end of the intermediate-concentration absorbing liquid partition tube 22 is inserted and joined, and about 60 degrees downward from the lower end of the intermediate cylindrical portion 85. An outer tapered portion 86 expanded at a taper angle is provided. A high-concentration absorbent outlet pipe 93, which is an end on the exit side of the high-concentration absorbent supply passage L3, is inserted into and joined to the outer tapered portion 86 from below. A large-diameter outer cylindrical portion 87 extends from the lower end of the outer tapered portion 86, and the outer peripheral wall 33 of the low-temperature regenerator 3 is provided.
Are fitted at their lower ends and their fitting surfaces are joined. It should be noted that the cylinders and cylinders provided concentrically in this embodiment, such as the intermediate-concentration absorbent partitioning cylinder 22 and the outer peripheral wall 33 of the low-temperature regenerator 3, may be arranged eccentrically by design. It is.

An absorption refrigerating apparatus 100 having the bottom plate 8
As described above, since the refrigerant partition 21, the medium-concentration absorbent partition 22, and the outer peripheral wall 33 of the low-temperature regenerator are multiplexed, the bottom is closed by the integrally formed bottom plate 8, so that the mechanical strength is reduced. high. In addition, the number of welding locations is reduced, and the occurrence and progress of corrosion of the welding area due to the absorbing liquid can be reduced. Also,
Pumping pipe 12, medium concentration absorbing liquid discharge pipe 91, refrigerant partition tube 2
1. The refrigerant discharge pipe 92, the medium-concentration absorbent partition pipe 22, the high-concentration absorbent outlet pipe 93, and the outer peripheral wall 33 of the low-temperature regenerator can be sequentially welded. Therefore, the welding operation can be easily and smoothly performed.

Further, since the refrigerant discharge pipe 92 and the high-concentration absorbent outlet pipe 93 are welded to the intermediate taper section 84 and the outer taper section 86, the mounting area of each pipe can be increased, and these weldings can be performed. And the diameter of each pipe can be increased, and the resistance of the pipe can be reduced.
Note that the same effect as described above can be obtained even if the portion where the small through hole 82 is formed in the central disk portion 80 is tapered. In addition, the medium-concentration absorbent supply path L2 is connected to the low-temperature regenerator 3
Another type of cylinder is provided inside, a bottom plate 8 at the bottom is provided with an inlet hole separately, and the absorption liquid supply path L2 is connected to supply the medium concentration absorption liquid into the low-temperature regenerator 3. The present invention can be applied.

The high-temperature regenerator 1 is formed with an ascending flow path L1 for the refrigerant vapor and the absorbing liquid, and communicates with the gas-liquid separating section 2. The gas-liquid separating section 2 has a medium concentration absorbing liquid receiving section 2B for supplying the absorbing liquid. It communicates with the upper part of the low-temperature regenerator 3 through a path L2. The high-concentration absorbent receiving portion 32 below the low-temperature regenerator 3 is connected to the absorbent spraying device 7 above the absorber 4 via an absorbent supply passage L3. The bottom of the absorber 4 is connected to an absorption liquid heating tank 11 of the high temperature regenerator 1 by an absorption liquid supply path L4 with a pump P.

A low-temperature heat exchanger H1 for exchanging heat with the heat of the absorbing liquid in the absorbing liquid supply path L3 and the absorbing liquid supply path L2 and heating the absorbing liquid from the absorber 4 to the absorbing liquid supply path L4. An exchange H2 is provided. The absorption liquid supply path L2 is provided with a solenoid valve V1 with an orifice and the high-temperature heat exchanger H2. The absorption liquid to the low-temperature regenerator 3 exchanges heat with the absorption liquid in the absorption liquid supply path L4 to lower the temperature. Can be The low-temperature heat exchanger H1 is provided in the absorption liquid supply passage L3, and the absorption liquid in the absorption liquid supply passage L3 exchanges heat with the absorption liquid in the absorption liquid supply passage L4 to lower the temperature.

The refrigerant liquid receiver 26 of the gas-liquid separator 2 and the condenser 6 communicate with each other through a refrigerant liquid supply passage L5. Low temperature regenerator 3
The gas-liquid separation section 3B and the condenser 6 communicate with each other, and the lower part of the condenser 6 and the refrigerant liquid dispersing tool 53 of the evaporator 5 communicate with each other through a refrigerant liquid supply path L6. An electromagnetic proportional control valve V3 is mounted on the refrigerant liquid supply passage L6. Evaporator 5 and absorber 4
The coil 51 in the evaporator 5 is connected to the indoor unit 52 of the air conditioner. The cooling coil 61 in the condenser 6 is connected to the cooling coil 41 in the absorber 4, and is further connected to the cooling tower 42 via a circulation path L7 of the heat transfer fluid.
In addition, a porous partition plate is provided between the evaporator 5 and the absorber 4 to prevent the absorbing liquid dropped in the absorber 4 from being scattered and entering the evaporator 5, and the cooling coils 41 and The coil 51 is supported. The absorbent is a high-temperature regenerator 1
Circulating in order of low temperature regenerator 3 → absorber 4 → pump P → high temperature regenerator 1.

In this absorption refrigerator, a low-concentration absorbent (aqueous lithium bromide solution) containing a large amount of refrigerant (water) is heated in a high-temperature regenerator 1 so that the absorbent boils, and the refrigerant is partially separated. The medium having an intermediate concentration is stored in the medium-concentration absorbent receiving portion 2B of the gas-liquid separator 2 by the gas-liquid separating umbrella 2A provided at the outlet of the ascending flow path L1. The refrigerant is condensed in the medium-concentration absorbent partition 22 and flows downward.

Since the inside of the gas-liquid separation section 2 is almost at atmospheric pressure and the inside of the low-temperature regenerator 3 is maintained at a low pressure of 70 mmHg, a medium-concentration absorbent is supplied to the solenoid valve with an orifice through the supply passage L2. V1 is supplied to the low-temperature regenerator 3 from the top of the low-temperature regenerator 3. At this time, the medium-concentration absorbent is removed by the low-temperature low-concentration absorbent in the high-temperature heat exchanger H2.
Liquid heat exchange and cooling. A medium-concentration absorbing liquid partition 22 that separates the gas-liquid separating section 2 from the low-temperature regenerator 3 is a heat transfer wall for heating the absorbing liquid in the low-temperature regenerator 3 with the refrigerant vapor in the gas-liquid separating section 2. And the middle concentration absorbent partitioning tube 22
Is caused to flow down to the refrigerant liquid receiving portion 26 between the medium-concentration absorbing liquid partition 22 and the refrigerant partition 21.

The medium-concentration absorbent entering from the top of the low-temperature regenerator 3 is reheated by the heat of the gas-liquid separation section 2 through the medium-concentration absorbent partition 22 and boils again. The refrigerant vaporized on the ceiling 31 of the upper gas-liquid separation unit 3B is completely separated and flows down to the high-concentration absorption liquid receiving unit 32. As a result,
The absorbent having a high concentration is supplied to the absorbent spraying device 7 above the absorber 4 through the supply path L3. At this time, the high-concentration absorbent is cooled by the low-temperature heat exchanger H1 provided in the supply path L3 and heats the low-concentration absorbent in the supply path L4. The refrigerant vapor separated on the ceiling 31 of the gas-liquid separation unit 3B enters the condenser 6 via the communication path, and is cooled and liquefied by the cooling coil 61.

The liquefied refrigerant in the condenser 6 is supplied to a supply passage L6.
Is supplied to the evaporator 5 while the flow rate is controlled by the electromagnetic proportional control valve V3 according to the required refrigeration capacity. The inside of the evaporator 5 is in a substantially vacuum state of about 5 mmHg, and the refrigerant sprayed on the surface of the coil 51 from the coolant sprayer 53 evaporates to take heat of evaporation from the coil 51. Thereby, the working fluid of the coil 51 is cooled, and the cooled working fluid flows to the indoor unit 52 of the air conditioner to perform cooling. Since the evaporated refrigerant is absorbed by the high-concentration absorbent dropped from the absorbent sprayer 7, the inside of the evaporator 5 (absorber 4) is maintained at a low pressure.

Since absorption heat is generated at the time of absorption, a cooling coil 41 is provided in the absorber 4, the absorbed heat is absorbed by the cooling water in the cooling coil 41, and then discharged outside in the cooling tower 42. The absorption capacity is maintained. The low-concentration heat exchanger H1 and the high-temperature heat exchanger H provided in the supply path L4 by the liquid pump P
2 and circulates to the high temperature regenerator 1. At this time, an electromagnetic proportional control valve V2 provided between the pump P and the high-temperature regenerator 1 appropriately controls the flow rate of the low-concentration absorbing liquid to be returned according to operating conditions such as a set required refrigerating capacity. .

That is, in the absorption refrigeration apparatus, the refrigerant vapor generated from the absorption liquid in the high-temperature regenerator 1 is condensed on the inner surface of the medium-concentration absorption liquid partition 22 by heat exchange with the low-temperature regenerator 3, The refrigerant liquid to In addition, the refrigerant vapor generated from the absorbing liquid in the low-temperature regenerator 3 is sent to the condenser 6. And
In the condenser 6, the refrigerant vapor is condensed by the action of the cooling water in the cooling coil 61, the refrigerant liquid sent from the condenser 6 to the evaporator 5 is evaporated by the action of the coil 51, and sent from the evaporator 5 to the absorber 4. The absorbed refrigerant vapor is absorbed by the absorbing liquid, the absorbed heat is taken out by the action of the cooling water in the cooling coil 41, and the cooling water is circulated with the cooling tower 42. As a result, the heat input from the air-conditioning indoor unit (cooling target) 52 is sent from the evaporator 5 to the absorber 4, and then is applied to the cooling water by the action of the cooling coil 41 and is discharged outside from the cooling tower 42. .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an absorption refrigeration apparatus of the present invention.

FIG. 2 is a sectional view of a main part of the absorption refrigeration apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature regenerator 2 Gas-liquid separation part 3 Low temperature regenerator 4 Absorber 5 Evaporator 6 Condenser 8 Bottom plate 11 Absorption liquid heating tank 12 Pumping pipe 21 Refrigerant partition 22 Medium concentration absorption liquid partition 80 Central disk part 83 Central cylindrical part 84 Intermediate taper part 85 Intermediate cylindrical part 86 Outer taper part 87 Outer cylindrical part 91 Medium concentration absorption liquid discharge pipe 92 Refrigerant discharge pipe 93 High concentration absorption liquid outlet pipe

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Katsuhiko Uenishi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (72) Kazumi Yamamoto 4-1-1, Hirano-cho, Chuo-ku, Osaka-shi No. 2 Osaka Gas Co., Ltd. (56) References JP-A-2-263068 (JP, A)

Claims (4)

(57) [Claims] 1. A high-temperature regenerator for boiling a low-concentration absorbing liquid containing a refrigerant, a liquid-pumping tube extending upward from the high-temperature regenerator, a refrigerant partition tube arranged on the outer periphery of the liquid-pumping tube, and An absorption refrigeration system comprising: a gas-liquid separation section comprising a container-shaped medium-concentration absorbent partition disposed on the outer periphery of the refrigerant partition; and a low-temperature regenerator disposed on the outer periphery of the intermediate-concentration absorbent partition. In the apparatus, the gas-liquid separation unit and the low-temperature regenerator may include a central disk portion provided with the liquid pumping pipe penetrating in a liquid-tight manner, and the refrigerant partition tube extending downward from an outer periphery of the central disk portion. The lower end of the central cylindrical portion having a lower end watertightly fitted therein, the middle cylindrical portion extending downward from the outer periphery of the central cylindrical portion and having the lower end of the middle concentration absorbing liquid partition externally fitted watertightly. , And an integrally formed bottom plate having a large-diameter outer cylindrical portion in which the lower end of the outer peripheral wall of the low-temperature regenerator is fitted in a water-tight manner. Absorption refrigerating apparatus which is characterized in that. 2. The refrigerant pipe according to claim 1, wherein a fitting surface of the pumping tube to the central disk portion is sequentially joined by welding, brazing, or the like, and a lower end of the refrigerant partition tube is fitted to the central cylindrical portion. Join the faces,
An absorption type wherein the fitting surface between the lower end of the middle concentration absorbing liquid partition and the intermediate cylindrical portion is joined, and the fitting surface between the lower end of the outer peripheral wall of the low temperature regenerator and the outer cylindrical portion is joined. Manufacturing method of refrigeration equipment. 3. The absorption refrigeration system according to claim 1, wherein the central cylindrical portion has an intermediate tapered portion that expands downward, and a refrigerant discharge pipe is connected to the intermediate tapered portion. 4. An absorption type refrigeration system according to claim 1, wherein said intermediate cylindrical portion has an outer peripheral tapered portion expanded downward, and an outlet pipe of a high-concentration absorbent is connected to said outer peripheral tapered portion. apparatus.