JP2957112B2 - Regenerator for absorption refrigeration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator main body of an absorption refrigerating apparatus using an aqueous solution such as lithium bromide as an absorbing solution.

[0002]

2. Description of the Related Art A refrigerator body of an absorption refrigeration system is a high-temperature regenerator in which a vertical cylindrical refrigerant vapor recovery cylinder is arranged on the outer periphery of a medium-concentration absorption liquid partition cylinder extending upward from the top of a heating tank. Prepare. It has a concentric or eccentric multi-cylinder structure in which a vertical cylindrical low temperature regenerator case is provided outside the refrigerant vapor recovery cylinder, and a vertical cylindrical evaporation / absorption case is formed outside the low temperature regenerator case. A bottom plate is applied to an annular gap between the medium-concentration absorbing liquid partition cylinder, the refrigerant vapor recovery cylinder, the low-temperature regenerator case, and the evaporation / absorption case, and the contact surface is welded in an airtight state.

In a high-temperature regenerator, a low-concentration absorbing liquid heated by a heating source such as a burner is heated and boiled to about 170 ° C., and refrigerant vapor and a medium-concentration absorbing liquid of about 160 ° C. are separated in a medium-concentration absorbing liquid partition tube. And is generated. In the refrigerant vapor recovery cylinder, the refrigerant liquid condensed by heat exchange on the wall surface accumulates at the bottom.
This refrigerant liquid is around 90 ° C., and is supplied to the condenser by a pressure difference through the refrigerant liquid flow path.

[0004]

It is desirable that the refrigerant liquid accumulated at the bottom of the refrigerant vapor recovery cylinder has a low temperature and does not boil or evaporate. However, for compactness, it is required to reduce the size, and it is difficult to increase the distance between the liquid surface of the medium concentration absorbing liquid in the medium concentration absorbing liquid partition and the bottom of the refrigerant vapor recovery cylinder. .

For this reason, the refrigerant liquid accumulated at the bottom of the refrigerant vapor recovery cylinder is re-boiled by the heat transfer from the medium-concentration absorption liquid. As a result, heat is deprived in the middle-concentration absorbent partition, causing a loss of boiling energy, thereby preventing the separation of the vapor refrigerant due to the boiling of the low-concentration absorbent. As a result, the refrigeration system
There is a problem that the thermal efficiency is reduced and the refrigerating capacity is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to transfer the heat of the medium-concentration absorbing liquid in the medium-concentration absorbing liquid partition to the refrigerant liquid accumulated at the bottom of the refrigerant vapor recovery cylinder without increasing the size of the refrigerator body. It is an object of the present invention to provide a regenerator capable of preventing a refrigerant liquid from boiling or evaporating and causing a loss of heat to reduce a refrigerating capacity.

[0007]

SUMMARY OF THE INVENTION A regenerator for an absorption refrigeration apparatus according to the present invention comprises a heating tank, a medium-concentration absorbing liquid partition extending upward from the heating tank, and a medium-concentration absorbing liquid partition. A high-temperature regenerator having a refrigerant vapor recovery cylinder disposed on an outer periphery thereof; a vertical cylindrical low-temperature regenerator case provided on the outer periphery of the refrigerant vapor recovery cylinder; and a vertical disposed on an outer periphery of the low-temperature regenerator case. A cylindrical evaporating / absorbing case, a condenser case disposed above the evaporating / absorbing case, a refrigerant vapor recovery cylinder, a low-temperature regenerator case, and a bottom plate welded to a lower end of the evaporating / absorbing case. In the regenerator of an absorption refrigeration apparatus having the above, the medium-concentration absorbent partition is an inner cylinder extending from a boiling port of the heating tank, an upper end welded to an upper end of the inner cylinder, and a bottom plate. Said inner cylinder having a welded lower end and Characterized by comprising the outer tube which forms an insulating gap between the.

A regenerator according to a second aspect of the present invention is characterized in that a heat insulating layer is formed on an inner peripheral wall of the middle concentration absorbing liquid partition near the bottom of the refrigerant vapor recovery cylinder. A regenerator according to a third aspect is characterized in that the heat insulating layer is a resin layer.

[0009]

The regenerator of this absorption refrigeration system is:
Since the medium-concentration absorbing liquid partition cylinder was formed of an inner cylinder and an outer cylinder forming an adiabatic gap between the inner cylinder and the lower end thereof being welded to the upper end thereof and the lower end thereof being welded to the bottom plate, It is possible to prevent the heat of the high-temperature medium-concentration absorbing liquid from being transmitted to the refrigerant liquid remaining at the bottom of the refrigerant vapor recovery cylinder. For this reason, the evaporation of the refrigerant liquid can be reduced, and the operation efficiency is improved.

According to the second aspect of the present invention, a heat insulating layer is provided on the inner surface of the intermediate-concentration absorbing liquid partition cylinder, and the same effect as the double cylinder is obtained. In the configuration of the third aspect, the heat insulating layer is made of a resin having excellent heat resistance and corrosion resistance, thereby improving durability.

[0011]

FIG. 1 shows a refrigerator main body 100 of an absorption refrigeration system. As shown in FIG. 2, the absorption refrigeration system 200 includes a refrigerator main body 100 and a cooling tower (cooling tower) CT, and a cooling unit (indoor unit) C
U is attached to form an air conditioner. Refrigerator body 10
Numeral 0 stands upright supported by a stand (not shown).

The refrigerator main body 100 is provided with a high-temperature regenerator 1 for heating and boiling the low-concentration absorbing liquid to separate it into medium-concentration absorbing liquid and refrigerant vapor. The high-temperature regenerator 1 includes a heating tank 11 in which a gas burner B as a heating source is disposed below, a medium-concentration absorbing liquid partition tube 12 formed of a stainless steel cylinder extending upward from the heating tank 11 and having an open upper end,
And a refrigerant vapor recovery cylinder 10 composed of a stainless steel vertical cylindrical airtight container disposed eccentrically on the outer periphery of the medium concentration absorbent partition cylinder 12.

In the medium-concentration absorbent partition 12, a medium-concentration absorbent having a medium concentration due to evaporation of the refrigerant is retained in a lower portion 121, and an absorbent (refrigerant vapor) boiled from an upper end opening 122.
Blows out into the refrigerant vapor recovery cylinder 10. 1A
Indicates the average liquid level of the oscillating medium concentration absorption liquid. A low-temperature regenerator 2 having a function of improving thermal efficiency is provided on the outer periphery of the refrigerant vapor recovery cylinder 10.

The low-temperature regenerator 2 is made of stainless steel, has a vertical cylindrical shape, has a refrigerant vapor outlet 21 opened in the ceiling, and has a low-temperature regenerator case 20 arranged concentrically with the medium-concentration absorbent partition 12. Is provided. Low temperature regenerator case 20
Is a low-pressure, high-pressure medium-absorbent partition 12 from the lower part 121 of the medium-concentrated absorbent flow path L1 through the heat exchanger H.
Is supplied via the medium.

The medium-concentration absorbent in the low-temperature regenerator case 20 re-evaporates using the outer peripheral surface of the refrigerant vapor recovery cylinder 10 as a heat source, and is separated into a high-concentration absorbent and refrigerant vapor. On the outer periphery of the low-temperature regenerator 2, an evaporating / absorbing case 30 made of stainless steel and formed of a vertical cylindrical airtight container is concentrically installed. Inside the evaporating / absorbing case 30, the absorber 3
And an evaporator 4 is provided on the outer peripheral side.

On the outer periphery of the low-temperature regenerator 2 and above the evaporating / absorbing case 30, a condenser case 50 made of a stainless steel vertical cylindrical airtight container is installed concentrically.
The condenser 5 in which the cooling coil 51 is disposed is configured.

The absorber 3 is provided with a cooling coil 31 wound in a vertical cylindrical shape inside an evaporating / absorbing case 30 and for spraying a high-concentration absorbing liquid to the cooling coil 31 above the cooling coil 31. A high-concentration absorbent sprayer 32 is attached. The evaporator 4 has an evaporator coil 41 wound in a vertical cylindrical shape disposed on an outer portion inside the evaporator / absorber case 30, and a refrigerant liquid disperser 42 disposed above the evaporator coil 41.

A high-temperature regenerator 1, a low-temperature regenerator 2, an absorber 3,
The evaporator 4 and the condenser 5 are arranged concentrically, and as shown in FIG. 1, the lower end is integrally welded to the bottom plate 6 to form a vertical cylindrical refrigerator main body 100. The intermediate-concentration absorbent partition tube 12 has an inner tube 14 fitted and welded to a cylindrical boiling port 13 having a lower end opened at the top of the heating tank 11.
And coaxially arranged in the inner cylinder 14 with a minute gap 15 therebetween,
The upper end is externally fitted and welded to the upper end of the inner cylinder 14, and the lower end is formed of the outer cylinder 16 fitted and welded to the central step portion 60 provided on the upper surface of the bottom plate 6.

The bottom plate 6 is integrally formed by pressing a stainless steel plate, and has a central portion 62 protruding upward through an inner step 61. The central portion 62 is provided with an insertion hole 63 through which the inner cylinder 14 of the intermediate-concentration absorbing liquid partition cylinder 12 is inserted. Four support claws 64 are projected from the insertion hole 63 circumferentially at 90 ° intervals, and support the lower outer peripheral wall of the inner cylinder 14 to maintain concentricity. The central step portion 60 is formed on the outer periphery of the insertion hole 63, and the lower end of the outer cylinder 16 is externally fitted and welded.

The lower end of the refrigerant vapor recovery cylinder 10 is externally fitted and welded to the inner step 61. An outer stage 66 is formed on the outer periphery of the inner stage 61 via an annular low-temperature regenerator bottom 65,
The lower end of the low-temperature regenerator case 20 is externally fitted and welded.
A cylindrical portion 67 extends downward from the outer step 66, and the cylindrical portion 67
An annular flange 68 is provided in the horizontal direction from the lower end. A short flange 33 in the horizontal direction is provided at the lower end of the evaporating / absorbing case 30. The outer periphery of the flange 68 and the outer periphery of the flange 33 are welded.

In the heating tank 11, the low-concentration absorbing liquid is boiled by heating with the burner B, and the temperature is about 170 ° C. The medium concentration absorbent in the lower part 121 of the medium concentration absorbent partition 12 is at about 160 ° C. The bottom 1B of the refrigerant vapor recovery cylinder 10 between the refrigerant vapor recovery cylinder 10 and the medium-concentration absorption liquid partitioning cylinder 12 serves as a refrigerant liquid receiving portion for storing liquefied refrigerant liquid, and a low-pressure condenser is provided in the refrigerant flow path L3. 5 is connected. This liquid refrigerant is at 90 ° C., re-evaporates in the condenser 5, is cooled by the cooling coil 51 and is re-liquefied.

When the refrigerant liquid in the bottom 1B of the refrigerant vapor recovery cylinder 10 re-boils or re-evaporates due to heat transfer from the medium-concentration absorbing liquid in the lower part 121 of the medium-concentration absorbing liquid partitioning cylinder 12, the condenser is operated by vapor lock. 5 cannot flow smoothly. In order to prevent this, the refrigerant vapor recovery cylinder 10
Partitioning tube 12 for medium-concentration absorbent into refrigerant liquid accumulated in bottom 1B
It is necessary to prevent heat transfer from the medium-concentration absorbing liquid in the lower part 121.

In this embodiment, the intermediate concentration absorbent partition 12
An inner cylinder 14 whose lower end is fitted and welded to the boiling port 13 of the heating tank 11, and is coaxially arranged with a small gap 15 between the inner cylinder 14 and an upper end is externally fitted and welded to the upper end of the inner cylinder 14. In addition, the lower end is formed by an outer cylinder 16 fitted and welded to a central step portion 60 provided on the upper surface of the bottom plate 6.

As a result, the heat conduction path of the intermediate-concentration liquid partitioning tube 12 is lengthened to reduce heat conduction. Below the minute gap 15, portions other than the four support claws 64 are open, and when the minute gap 15 acts as an air insulation layer between the inner cylinder 14 and the outer cylinder 16, the expanded air Acts as an escape hole.

Between the bottom of the absorber 3 and the bottom of the heating tank 11, a low-concentration absorbing liquid flow for returning the low-concentration absorbing liquid discharged from the absorber 3 to the heating tank 11 of the high-temperature regenerator 1. It is connected by road L2. Low concentration absorbent flow path L2
Is provided with a heat exchanger H and an absorbent pump P1.

The upper part of the low-temperature regenerator 2 is a gas-liquid separator 22. The gas-liquid separator 22 is located between the upper part of the condenser 5 and the gap 5.
It communicates via A. The lower part 121 of the intermediate-concentration absorbent partition 12 is connected to the low-temperature regenerator 2 through the medium-concentration absorbent flow path L1.
Communicate with the top or bottom (the top in the figure). The high-concentration absorbent receiving section 23 of the low-temperature regenerator 2 is connected to the high-concentration absorbent sprayer 32 via the heat exchanger H by a high-concentration absorbent flow path L4.

The lower part of the condenser 5 and the evaporator coil 4 of the evaporator 4
The refrigerant liquid dispersing device 42 installed above 1 is connected to a refrigerant liquid supply passage L5 in which a solenoid valve V1 with an orifice is interposed. After the refrigerant is dropped from the refrigerant liquid sprayer 42 onto the surface of the evaporating coil 41, the refrigerant takes away heat of vaporization from the evaporating coil 41, evaporates, and cools cold and hot water as a heat medium flowing inside.

The vapor refrigerant generated at this time is absorbed by the high concentration absorbing liquid dropped from the high concentration absorbing liquid sprayer 32 on the surface of the cooling coil 31. The absorption liquid having a low concentration by absorbing the refrigerant is returned to the heating tank 11 by the absorption liquid pump P1 through the low concentration absorption liquid flow path L2.

The cooling coil 31 is connected to the cooling coil 51, and further connected to the cooling tower CT via the cooling water circulation path 34. The cooling water is supplied by the cooling water pump P2 to the cooling tower CT → the cooling coil 31 → the cooling coil 51 → It circulates in the order of the cooling tower CT. The evaporating coil 41 is connected to the indoor unit CU through a cold / hot water circulation path 43 having a cold / hot water pump P3.

The low-temperature low-concentration absorbent discharged from the absorber 3 is supplied to the heat exchanger H by the absorbent pump P1 and is heated after exchanging heat with the high-concentration absorbent and the medium-concentration absorbent. Is returned to the heating tank 11 and again heated and boiled.

The medium-concentration absorbing liquid in the medium-concentration absorbing liquid partition 12 has a high temperature, and is exchanged with the low-concentration absorbing liquid in the heat exchanger H. After being cooled, the medium is supplied to the low-temperature regenerator 2 by a pressure difference. Supplied. The high-concentration absorbent generated in the low-temperature regenerator 2 exchanges heat with the low-concentration absorbent in the heat exchanger H to become low in temperature, and is supplied to the high-concentration absorbent sprayer 32 with a pressure difference.

FIG. 3 shows another embodiment. In this embodiment, the high-temperature regenerator 1 has a liquid pumping pipe 18 connected to the boiling port 13 of the heating tank 11. Medium concentration absorbent partition 12
The lower end of the medium-concentration absorbent partition 12 is externally fitted and welded to the lower part of the pumping pipe 18 which is an extension of the heating tank 11, and extends upward.

A heat insulating layer 7 made of a fluororesin cylinder is provided on the inner peripheral surface of the lower part of the intermediate-concentration liquid partitioning cylinder 12. The heat-insulating layer 7 is composed of the pumping pipe 18 and the medium-concentration absorbing liquid partition 1.
2 prevents the heat of the medium-concentration absorption liquid accumulated between the refrigerant vapors from being transferred to the refrigerant liquid accumulated at the bottom 1B of the refrigerant vapor recovery cylinder 10.

The heat insulating layer 7 is not limited to a cylindrical body made of a fluororesin, but may be coated with a resin such as a fluororesin on the inner peripheral surface, or may be a cylindrical body made of a ceramic or a ceramic coating.

Also in this embodiment, if the middle-concentration absorbing liquid partitioning cylinder 12 is constituted by the inner cylinder 14 and the outer cylinder 16 and the minute gap 15 opened downward is an air heat insulating layer, the heat transfer can be further reduced. In the embodiment shown in FIG. 1, the heat insulating layer 7 is provided on the inner peripheral surface of the lower part of the medium-concentration absorbing liquid partition 12 so that the refrigerant liquid accumulated on the bottom 1B of the refrigerant vapor recovery tube 10 boils and evaporates. The prevention effect can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a refrigerator main body of an absorption refrigerator.

FIG. 2 is a conceptual diagram of an absorption refrigeration apparatus.

FIG. 3 is a sectional view of a refrigerator main body according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 Refrigerator main body 200 Absorption refrigeration apparatus 1 High temperature regenerator 2 Low temperature regenerator 3 Absorber 4 Evaporator 5 Condenser 6 Bottom plate 7 Heat insulation layer 10 Refrigerant vapor recovery cylinder 11 Heating tank 12 Medium concentration absorption liquid partition 13 Boiling port 14 Inner cylinder 15 Micro gap 16 Outer cylinder 20 Low temperature regenerator case 30 Evaporation / absorption case 50 Condenser case 61 Inner step 63 Insertion hole 66 Outer step 67 Tube part 1B Bottom part

Continuation of front page (56) References JP-A-2-263068 (JP, A) JP-A-7-190554 (JP, A) JP-A-7-43032 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) F25B 33/00 F25B 15/00 303

Claims (3)

(57) [Claims] A high-temperature regenerator having a heating tank, a medium-concentration absorbent partition extending upward from the heating tank, and a refrigerant vapor recovery cylinder disposed on an outer periphery of the medium-concentration absorbent partition; A vertical cylindrical low-temperature regenerator case provided on the outer periphery of the refrigerant vapor recovery cylinder; a vertical cylindrical evaporator / absorber case disposed on the outer periphery of the low-temperature regenerator case; A condenser case disposed above, the refrigerant vapor recovery cylinder, a low-temperature regenerator case, and an evaporator
In a regenerator of an absorption refrigerating apparatus having a bottom plate welded to a lower end of an absorption case, the medium-concentration absorption liquid partition tube includes an inner cylinder extending from a boiling port of the heating tank, and an upper end of the inner cylinder. A regenerator having an upper end welded to the inner plate and an outer tube having a lower end welded to the bottom plate and forming an adiabatic gap with the inner tube. A high-temperature regenerator having a heating tank, a medium-concentration absorbent partition extending upward from the heating tank, and a refrigerant vapor recovery cylinder disposed on the outer periphery of the medium-concentration absorbent partition; A vertical cylindrical low-temperature regenerator case provided on the outer periphery of the refrigerant vapor recovery cylinder; a vertical cylindrical evaporator / absorber case disposed on the outer periphery of the low-temperature regenerator case; A condenser case disposed above, the refrigerant vapor recovery cylinder, a low-temperature regenerator case, and an evaporator
In a regenerator of an absorption refrigerating apparatus having a bottom plate welded to a lower end of an absorption case, a heat insulating layer is formed on an inner peripheral wall of the medium concentration absorption liquid partition near a bottom of the refrigerant vapor recovery cylinder. And a regenerator. 3. The regenerator according to claim 2, wherein the heat insulating layer is a resin layer.