JPH07190554A - Absorption type refrigerator and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve hermetical sealability of a bottom plate and to simplify a mechanical structure in an absorption type refrigerator in which multiple cylindrical low-temperature regenerators are disposed on an outer periphery of a vapor-liquid separator formed of a cylindrical vessel. CONSTITUTION:An absorption type refrigerator has a high-temperature regenerator for boiling low-concentration absorption liquid containing refrigerant, a vapor-liquid separator 2 having a lift riser extended upward from the regenerator, a refrigerant partition cylinder 21 disposed on an outer periphery of the riser, and a vessel-like intermediateconcentration absorption liquid partition cylinder 22 disposed on an outer periphery of the cylinder 21, and a cylindrical low-temperature regenerator 3 disposed on an outer periphery of the separator 2, and comprises an integrally molded bottom plate 8 having a central cylindrical part 83 with a ceiling coupled with the riser and externally engaged with a lower end of the cylinder 21, an intermediate cylindrical part 85 extended down from an outer periphery of the part 83 and externally engaged with a lower end of the cylinder 22, and an outer cylindrical part 87 externally engaged with a lower end of the regenerator 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type refrigeration system equipped with a high temperature regenerator and a low temperature regenerator for absorbing liquid.

[0002]

2. Description of the Related Art An absorption liquid such as an aqueous lithium bromide solution is heated by a heating source and boiled in a regenerator to separate the solution (refrigerant) and the absorption liquid (high concentration aqueous lithium bromide solution). A high-temperature regenerator that boils a low-concentration absorbent with a heating source such as a burner as a regenerator, and a gas-liquid separation unit that separates the low-concentration absorbent that has boiled in the high-temperature regenerator into a refrigerant vapor and a medium-concentration absorbent. A low-temperature regenerator that is provided on the outer periphery so as to enclose the gas-liquid separation unit and uses the thermal energy of the refrigerant vapor in the gas-liquid separation unit to reboil the medium-concentration absorbent and separate it into a refrigerant and a high-concentration absorbent. An absorption type refrigerating apparatus provided with the same is known.

[0003]

However, in the absorption type refrigerating apparatus which employs the low temperature regenerator as described above, since the cylindrical containers of the equipment are multiply arranged, the bottom structure of each equipment is complicated. Becomes Further, since the absorbing liquid has a high corrosive power, even when a material having high corrosion resistance such as stainless steel is used as the material, the composition changes at the welded portion of the member, the metal particles become coarse, and the corrosion resistance decreases. When corrosion occurs and progresses, there is a problem that airtightness decreases with time.

An object of the present invention is to improve the airtightness of a bottom plate in an absorption type refrigerating apparatus in which a plurality of tubular low temperature regenerators are arranged on the outer periphery of a gas-liquid separating portion of a high temperature regenerator composed of a tubular container. There is a simplification of the mechanical structure. The purpose of claim 2 is
It is in the ease of manufacturing. An object of the invention described in claims 3 and 4 is to enable connection of thick pipes for supplying the absorbing liquid or the refrigerant to the bottom plate of each device.

[0005]

The present invention provides a high temperature regenerator for boiling a low-concentration absorbent containing a refrigerant, a pumping pipe extending upward from the high temperature regenerator, and an outer periphery of the pumping pipe. A gas-liquid separation unit composed of a refrigerant partition tube arranged and a container-shaped medium-concentration absorbent partition tube arranged on the outer periphery of the refrigerant partition tube, and low-temperature regeneration arranged on the outer periphery of the medium-concentration absorbent partition tube In the absorption type refrigerating apparatus including a vessel, the gas-liquid separating section and the low-temperature regenerator are provided with a central disc portion provided with the pumping pipe penetrating liquid-tightly, and downward from an outer periphery of the central disc portion A small-diameter central cylindrical portion that is extended to and has a lower end of the refrigerant partition cylinder fitted in a watertight manner,
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 medium-concentration absorbent partitioning pipe fitted in a watertight manner,
And, the lower end of the outer peripheral wall of the low temperature regenerator has an integrally molded bottom plate having a large diameter outer cylindrical portion fitted in a watertight manner.

A method of manufacturing an absorption refrigerating apparatus according to claim 2 is
Sequentially, the fitting surface to the central disk portion of the pumping pipe is welded, joined by brazing, etc., the fitting surface of the lower end of the refrigerant partition tube and the central cylindrical portion are joined, and the medium-concentration absorption liquid It is characterized in that the lower end of the partition cylinder and the fitting surface of the intermediate cylindrical portion are joined together, and the lower end of the outer peripheral wall of the low temperature regenerator and the fitting surface of the outer cylindrical portion are joined together. In the third or the fourth aspect, the tapered portion is provided on the cylindrical portion of the bottom plate, and the pipe is connected to the tapered portion.

[0007]

According to the present invention, since the bottom plates of the cylindrical containers arranged in multiple layers are integrally formed, there are few joints such as welding and brazing on the bottom plate, and there is no airtightness due to corrosion of the joints. It can be reduced. In the structure according to claim 2, since the integrally molded bottom plate is set to be lower 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. Excellent workability as it can be performed sequentially from the container. In the invention of claim 3 or claim 4, since the end of the pipe can be connected to the taper portion, the pipe mounting area can be increased, and the man-hour of the connection work can be reduced and the flow resistance can be reduced by mounting the thick pipe. Is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an absorption refrigerating apparatus 1 according to the present invention.
Indicates 00. The absorption refrigerating apparatus 100 is provided with a gas-liquid separation section 2 above a high temperature regenerator 1 for heating and boiling a low-concentration absorption solution with a gas burner B, and a spherical shell-shaped ceiling around the gas-liquid separation section 2. A low temperature regenerator 3 having a vertical annular cross section with 31 is provided. An absorber 4 is provided around the low temperature regenerator 3.
Is provided, the evaporator 5 is provided on the outer peripheral portion of the absorber 4, and the condenser 6 is provided above. Above the cooling coil 41 installed in the absorber 4, the absorbent sprayer 7 is mounted.
A liquid pump P is provided between the bottom of the absorber 4 and the high temperature regenerator 1.
Is installed.

As shown in FIG. 2, the gas-liquid separating section 2 and the low temperature regenerator 3 of the high temperature regenerator 1 are closed by an integrally molded bottom plate 8 formed by drawing a stainless steel plate. High temperature regenerator 1
Has an absorption liquid heating tank 11 heated by a gas burner B, and the ascending flow path L is provided from the top of the heating tank 11.
The pumping pipe 12 forming 1 is vertically projected. An upper pumping pipe 13 protruding into the gas-liquid separating section 2 is connected to the upper end of the pumping pipe 12, and a baffle for promoting gas-liquid separation is attached to the upper end of the upper pumping pipe 13. There is.

The gas-liquid separating section 2 is composed of a refrigerant partition cylinder 21 arranged on the outer circumference of the upper pumping pipe 13 and a medium-concentration absorbing liquid partition cylinder 22 arranged on the outer circumference of the refrigerant partition cylinder 21. An outer peripheral wall 33 of the low temperature regenerator 3 is provided on the outer periphery of the medium concentration absorbent partition 22.
Are arranged coaxially. The bottom plate 8 has a through large hole 81 with an upward protruding edge into which the upper end of the pumping pipe 12 is inserted and welded, and a medium-concentration absorbent discharging pipe 91 which is an inlet end of the middle-concentration absorbent supplying path L2. It has the central disk part 80 by which the through-hole 82 with an upward protrusion edge which is welded together is juxtaposed. The central disc portion 80 extends downward from the outer periphery of the central disc portion 80, and the lower end of the refrigerant partitioning cylinder 21 is externally fitted to the central disc portion 80. The fitting surface is joined by welding, brazing, etc. An intermediate taper portion 84 is provided which expands downward at a taper angle of approximately 60 degrees from the lower end of the portion 83 and the central cylindrical portion 83.

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

Absorption type refrigeration system 100 having this bottom plate 8
However, since the refrigerant partitioning cylinder 21, the medium-concentration absorbent partitioning cylinder 22, and the outer peripheral wall 33 of the low temperature regenerator are multiply arranged as described above, the bottom is closed by the integrally molded bottom plate 8, so that the mechanical strength is improved. high. In addition, the number of welded parts is reduced, and the occurrence and progress of corrosion due to the absorbing liquid in the welded parts 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 partitioning tube 22, the high-concentration absorbent outlet pipe 93, and the outer peripheral wall 33 of the low-temperature regenerator can be welded in this order. Therefore, the welding work can be performed easily and smoothly.

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

In the high temperature regenerator 1, an ascending flow path L1 for the refrigerant vapor and the absorbing liquid is formed so as to communicate with the gas-liquid separating unit 2, and the medium-liquid absorbing unit 2B supplies the absorbing liquid to the medium-concentration absorbing liquid receiving unit 2B. It communicates with the upper part of the low temperature regenerator 3 via a path L2. The high-concentration absorbent receiving part 32 in the lower part of the low temperature regenerator 3 is connected to the absorbent sprayer 7 in the upper part of the absorber 4 via the absorbent supply path L3. The bottom of the absorber 4 is connected to the absorption liquid heating tank 11 of the high temperature regenerator 1 by an absorption liquid supply path L4 with a pump P.

In the absorbing liquid supply path L4, a low temperature heat exchanger H1 and a high temperature heat exchanger for heating the absorbing solution from the absorber 4 by exchanging heat with the absorbing solution in the absorbing solution supplying path L3 and the absorbing solution supplying path L2. An exchange H2 is provided. The absorption liquid supply path L2 is provided with an electromagnetic valve V1 with an orifice and the high temperature heat exchanger H2, and the temperature of the absorption liquid to the low temperature regenerator 3 is reduced by exchanging heat with the absorption liquid in the absorption liquid supply path L4. To 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 receiving portion 26 of the gas-liquid separating portion 2 and the condenser 6 are communicated with each other through the refrigerant liquid supply passage L5. Low temperature regenerator 3
The gas-liquid separation unit 3B and the condenser 6 are in communication with each other, and the lower portion of the condenser 6 and the refrigerant liquid spraying device 53 of the evaporator 5 are in communication with each other through the refrigerant liquid supply path L6. An electromagnetic proportional control valve V3 is attached to the refrigerant liquid supply path L6. Evaporator 5 and absorber 4
And 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 further connected to the cooling tower 42 by the heat transfer fluid circulation path L7.
It should be noted that 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 scattering and entering the evaporator 5, and to cool the cooling coil 41 and It supports the coil 51. Absorption liquid is high temperature regenerator 1
→ low temperature regenerator 3 → absorber 4 → pump P → high temperature regenerator 1 in this order.

In this absorption refrigerator, a low-concentration absorption liquid (lithium bromide aqueous solution) containing a large amount of refrigerant (water) is heated in the high temperature regenerator 1 to boil the absorption liquid, and the refrigerant is partially separated. The medium-concentrated absorbing solution is collected in the medium-concentration absorbing solution receiving section 2B of the gas-liquid separating section 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 separator 2 is at about atmospheric pressure and the inside of the low-temperature regenerator 3 is maintained at a low pressure of 70 mmHg, the medium-concentration absorbent is a solenoid valve with an orifice through the supply path L2. It is supplied to the low temperature regenerator 3 from the top of the low temperature regenerator 3 via V1. At this time, the medium-concentration absorption liquid is absorbed by the low-temperature low-concentration absorption liquid in the high-temperature heat exchanger H2.
Liquid heat exchange and cooling. The medium-concentration absorbent partition 22 that separates the gas-liquid separator 2 and the low-temperature regenerator 3 is a heat transfer wall for heating the absorbent in the low-temperature regenerator 3 with the refrigerant vapor in the gas-liquid separator 2. The medium-concentration absorption liquid partition tube 22
The refrigerant liquid generated by the condensation on the inner surface of the medium is caused to flow down to the refrigerant liquid receiving portion 26 between the medium-concentration absorbing liquid partition cylinder 22 and the refrigerant partition cylinder 21.

The medium-concentration absorption liquid that has entered 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 absorption-liquid partition tube 22 and boiled again. The vaporized refrigerant is completely separated in the ceiling 31 of the upper gas-liquid separating section 3B and flows down to the high-concentration absorbent receiving section 32. As a result,
The highly concentrated absorption liquid is supplied to the absorption liquid spraying tool 7 on the upper part of the absorber 4 through the supply path L3. At this time, the high-concentration absorption liquid is cooled by the low-temperature heat exchanger H1 provided in the supply passage L3, and at the same time, the low-concentration absorption liquid in the supply passage L4 is heated. Further, the refrigerant vapor separated at the ceiling 31 of the gas-liquid separating section 3B enters the condenser 6 via the communication passage, and is cooled and liquefied by the cooling coil 61.

The liquefied refrigerant in the condenser 6 is supplied to the supply line L6.
Is supplied to the evaporator 5 while the flow rate is controlled by the electromagnetic proportional control valve V3 via the valve according to the required refrigerating capacity. The inside of the evaporator 5 is in a substantially vacuum state of about 5 mmHg, and the refrigerant sprayed from the refrigerant liquid spraying tool 53 on the surface of the coil 51 evaporates to remove the heat of evaporation from the coil 51. As a result, the working fluid of the coil 51 is cooled, and the cooled working fluid flows into the indoor unit 52 of the air conditioner for cooling. Since the evaporated refrigerant is absorbed by the high-concentration absorption liquid dropped from the absorption liquid spraying device 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 arranged in the absorber 4, and the absorption heat is absorbed by the cooling water in the cooling coil 41 and then discharged to the outside by the cooling tower 42. The absorption capacity is maintained. The absorbing liquid, which has absorbed the refrigerant and has a low concentration, receives the low temperature heat exchanger H1 and the high temperature heat exchanger H provided in the supply path L4 by the liquid pump P.
It is heated at 2 and circulated 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 this absorption refrigerating apparatus, the refrigerant vapor generated from the absorbing liquid in the high temperature regenerator 1 is condensed with the low temperature regenerator 3 by the heat exchange with the low concentration regenerator 3 to condense on the inner surface of the medium concentration absorbing liquid partition tube 22, and the condenser 6 Send refrigerant liquid to. Further, 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, and the absorbed heat is taken out by the action of the cooling water in the cooling coil 41, and the cooling water is circulated between the cooling tower 42 and the cooling tower 42. As a result, the heat input from the air conditioner indoor unit (object to be cooled) 52 is sent from the evaporator 5 to the absorber 4, and then applied to the cooling water by the action of the cooling coil 41 and discharged from the cooling tower 42 to the outside. .

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of the main parts of the absorption refrigeration system of the present invention.

[Explanation of symbols]

 1 High Temperature Regenerator 2 Gas-Liquid Separator 3 Low Temperature Regenerator 4 Absorber 5 Evaporator 6 Condenser 8 Bottom Plate 11 Absorbing Liquid Heating Tank 12 Pumping Liquid Pipe 21 Refrigerant Partition Tube 22 Medium Concentration Absorbing Fluid Partition Tube 80 Central Disk Section 83 Central cylindrical part 84 Intermediate tapered part 85 Intermediate cylindrical part 86 Outer tapered part 87 Outer cylindrical part 91 Medium-concentrated absorbent discharge pipe 92 Refrigerant discharge pipe 93 High-concentration absorbent outlet pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Uenishi 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd. (72) Kazumi Yamamoto 4-1-2 Hirano-cho, Chuo-ku, Osaka No. within Osaka Gas Co., Ltd.

Claims (4)

[Claims] 1. A high-temperature regenerator for boiling a low-concentration absorption liquid containing a refrigerant, a pumping pipe extending upward from the high-temperature regenerator, a refrigerant divider arranged on the outer periphery of the pumping pipe, and Absorption type refrigeration equipped with a gas-liquid separation section consisting of a container-shaped medium-concentration absorbent partitioning cylinder arranged on the outer periphery of the refrigerant partitioning cylinder, and a low-temperature regenerator arranged on the outer periphery of the medium-concentration absorbing liquid partitioning cylinder. In the apparatus, the gas-liquid separation section and the low temperature regenerator are provided with a central disc portion provided with the pumping pipe penetrating liquid-tightly, and the refrigerant partition tube extending downward from an outer periphery of the central disc portion. A small diameter central cylindrical portion whose lower end is fitted in a watertight manner, and a middle-diameter intermediate cylindrical portion which extends downward from the outer periphery of the central cylindrical portion and whose lower end is fitted in a watertight manner 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 watertight manner. Absorption refrigerating apparatus which is characterized in that. 2. The fitting of the lower end of the refrigerant partitioning cylinder to the central cylindrical portion of claim 1, wherein the fitting surfaces of the pumping pipe to the central disc portion are sequentially joined by welding, brazing, or the like. Join faces,
An absorption formula characterized in that the fitting surface between the lower end of the intermediate concentration absorbent 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. Refrigeration apparatus manufacturing method. 3. The absorption type refrigerating apparatus according to claim 1, wherein the central cylindrical portion has an intermediate taper portion that expands downward, and a refrigerant discharge pipe is connected to the intermediate taper portion. 4. The absorption refrigeration system according to claim 1, wherein the intermediate cylindrical portion has an outer peripheral taper portion that is widened downward, and an outlet pipe for a high-concentration absorbent is connected to the outer peripheral taper portion. apparatus.