JPS58164968A - Device for pumping up refrigerant liquid for double effect absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dual effect absorption refrigerator. More specifically, the refrigerant vapor from the high-wetting regenerator is supplied to a refrigerant pumping device that omit the refrigerant pump and introduces unevaporated refrigerant from the evaporator and condensed refrigerant from the condenser.

The present invention relates to a double-effect absorption refrigerating machine that applies shock to a mixed refrigerant liquid to generate bubbles, and supplies the refrigerant liquid from which the bubbles have been separated by a gas-liquid separator to a dispersion device.

Conventionally, in a dual-effect absorption refrigerator, in order to spread refrigerant from a dispersion device to the tube surface of the tube group of the evaporator, the refrigerant is passed through a pipe line that supplies unevaporated refrigerant liquid from a reservoir at the bottom of the evaporator to the dispersion device. A liquid pump is provided.

However, since the inside of the machine is operated in a vacuum state, the refrigerant liquid pump is required to be vacuum resistant and uses a canned motor type pump which is relatively expensive and inefficient.

Another drawback is that when repairing or replacing the refrigerant pump, which often breaks down, outside air enters the inside of the machine, corroding the shell, built-in parts, and equipment.

There is also a known method in which the unevaporated refrigerant liquid is returned to the absorption liquid side instead of being stored in the lower part of the evaporator and does not use a refrigerant liquid pump. If the absorption capacity is relatively high, the absorption capacity is weakened due to insufficient air extraction, or the operation is at partial load, the regenerated refrigerant liquid will not be completely evaporated in the evaporator and will mix into the absorption liquid side. Since this results in extremely inefficient operation, it is not practical in a dual-effect system that emphasizes energy conservation.

Therefore, it would be better to eliminate the refrigerant liquid pump, which is prone to failure, but first, an overview of the refrigeration machine will be explained with reference to FIG. 1.

The interior of the shell 1, which is kept in a high vacuum, is doubled by a partition 6, with an absorber 2 and an evaporator 3 built into the lower low pressure side, and a low temperature regenerator 4 and a condenser 5 built into the upper high pressure side. are doing. Each tube group is fixed to the tube hole in the tube plate at both ends of the body 1 with an expander band, etc., and the structure is such that the required fluid flows into the tube through the tube (evaporator). The refrigerant sprayed on the tube surface of the tube group No. 3 by the distribution device wll flows down and evaporates at a low temperature, passing through the tube wall to the evaporator No. 3.
The cold water flowing inside the pipe is cooled to the required low temperature. This cold water can be used for various cooling purposes.

The refrigerant vapor evaporated in the evaporator 3 is absorbed by the concentrated absorption liquid that is sprayed on the tube surface of the tube group of the absorber 2 by the sprayer 19. The diluted absorption liquid that has absorbed the refrigerant vapor accumulates in the reservoir 7 at the bottom of the absorber 3.This diluted absorption liquid is passed through a pipe line by an absorption liquid pump 16, and is then sent to the high-temperature heat exchanger 17 via a low-temperature heat exchanger 17. 18 where it is heated and sent to a high temperature heat exchanger 112. The intermediate 1 degree absorbent liquid sent to the high temperature regeneration 112 rises and enters the high 1 island heat exchanger IB and flows into the low temperature regenerator 4 through the pipe line. The refrigerant vapor evaporated and separated in the high-temperature regenerator 12 flows into the pipes of the tube group of the low-humidity regenerator 4, and the intermediate-concentration absorption liquid that has flowed in from the high-temperature regenerator 12 is further heated and concentrated to become a high-concentration absorption liquid. After being led to the heat exchanger 1W17 and cooling by exchanging heat with the rare absorber, it is led to the spraying device f19 and sprayed into the absorber 2. The absorption liquid is circulated by repeating this operation.

On the other hand, the refrigerant vapor evaporated in the high-temperature regeneration 1112 is guided as a heating medium to the low-temperature regenerator 4, where the refrigerant vapor whose temperature has been lowered by dissipating heat is condensed, and the liquid reservoir 20V of the condenser 5 is
ctM people. This inflowing refrigerant evaporates in the low humidity regenerator 4, flows into the condenser 5, is mixed with the condensed refrigerant, and is collected in the liquid reservoir 20. The refrigerant in the liquid reservoir 20 joins with the refrigerant pumped by the refrigerant liquid pump 10 from the lower reservoir 8 of the evaporator 3 and is sprayed into the evaporator 3 through the spraying device 11 . This operation is repeated and circulated.

Pumps are used in each of the refrigerant circulation system and the absorption liquid Mll system. As an improved version of this, a dual-effect absorption refrigerating machine was proposed in Japanese Patent Publication No. 12146/1983, which had a structure in which a bubble pumping device was provided in place of the refrigerant liquid pump. That is, as shown in FIG. 2, the unevaporated refrigerant in the lower reservoir part 8 of the evaporator 3 is heated and heated by the refrigerant in the liquid reservoir 20 of the condenser 5 via the heat exchanger 21 to eliminate bubbles. generated, and guided to the mixing chamber 22 using the pumping action of the bubbles,
Here, it is mixed with the refrigerant that has undergone heat exchange and is sprayed onto the tube surfaces of the tube group of the evaporator 3 through the spraying device 11.

However, this method of exchanging heat between the refrigerant in the reservoir section 8 at the lower part of the evaporator 3 with the refrigerant from the liquid reservoir of the condenser 5 and circulating the refrigerant using a bubble pump requires a heat exchanger, resulting in high costs. In addition, the generation of bubbles becomes unstable due to differences in the liquid level position in the reservoir section 8 and the pressure in the condenser 5 due to partial loads or changes in the temperature of the cooling water, and furthermore, if the refrigerant is above the saturation temperature. Since it has a property that it is difficult to generate bubbles, it is unstable if only a heating means is used, and there is a risk that the circulation of the refrigerant will be inhibited.

The present invention was conceived in view of the above circumstances, and includes:
The refrigerant liquid pump is eliminated, and the unevaporated refrigerant is led to the dispersion device through the reservoir p section at the bottom of the evaporator.The condensed refrigerant is led to the dispersion device through a zero-shaped pipe from the liquid reservoir of the condenser, which is used as a heat source, to form a bubble pump. In place of the conventional heat exchanger, a refrigerant pumping device is provided, and the unevaporated refrigerant and condensed refrigerant are introduced into the refrigerant pumping device and mixed, and the refrigerant vapor from the high temperature regenerator is added to the mixed refrigerant. This book makes it possible to reliably generate bubbles with less thermal energy than the input of the refrigerant liquid pump under all operating conditions by supplying the refrigerant and applying an impact, thereby making it possible to perform a stable liquid pumping action.

The present invention will be explained below with reference to the embodiments shown in FIGS. 3 and 4. The same parts as in the conventional example in Fig. 1 are given the same symbols and their explanations are omitted.◎ In Fig. 3, 23 is a liquid pumping device; and the condensed refrigerant accumulated in the liquid reservoir 20 of the condenser 5 are pumped into the liquid pumping device ff12.
:II is connected to the reservoir 8 and the reservoir 20 by conduits 28 and 29 for mixing.

2◆ is a liquid lifting pipe connected to the top of the liquid lifting device 23, and...
・; At its upper end, an opening protrudes into the gas/liquid external 111 vessel 251M. Further, near the top of the liquid lifting device 23 at the lower end of the liquid lifting pipe 24, a conduit 26 which is multi-branched from a pipe that leads refrigerant vapor from the high temperature regenerator to the low temperature regenerator 4 is connected, and a part of the refrigerant vapor is removed. 〇In addition, 27 is an orifice that is used to violently jet the refrigerant vapor from the high-temperature regenerator in a conical shape to give an impact to the mixed refrigerant liquid in the pumping device ff12a and to adjust the flow rate. .

The liquid pumping device [23 is the liquid pumping device 11 as shown in FIG.
It has the function of applying a shock to the refrigerant mixed inside 23. Figure 4(a) shows a system in which high-temperature refrigerant vapor generated in high-temperature regeneration 912 is ejected from the open end of the pipe 26 into the mixed refrigerant liquid to give an impact. A baffle plate 30 is provided in the device 1123 and the conduit 28.2
In addition, in (c), a vibration device 131 is attached to the liquid pumping device 23 itself, and the liquid pumping device 23 is vibrated. The mixed liquid inside is given a shock by causing the mixed liquid to flow into the liquid pumping device 1123 through the W passage 28, 29 as shown in 2). The refrigerant is caused to flow tangentially to generate a vortex in the liquid mixture, and this vortex gives an impact to the liquid mixture.

Next, the operation of this device will be explained.

The unevaporated refrigerant sprayed from the spraying device 11 onto the tube surface of the evaporator@3 tube group flows into the reservoir section 8 at the bottom of the evaporator 3 through the reservoir 9 pipe line 28, and flows into the liquid pumping device 23. 5 liquid reservoir 20
The condensed refrigerant accumulated in the reservoir 8 flows into the pumping liquid device 23 through the conduit 29 and is mixed therewith. At this time, the condensed refrigerant is depressurized and flushed, heating the unevaporated refrigerant from the reservoir 8 to raise its temperature. During this process, the mixed refrigerant is subjected to impact to promote flashing. Furthermore, high temperature regeneration g9 passes through the branch pipe 26.
The refrigerant vapor from 12 is injected into the static mixed refrigerant from the lower end of the liquid pumping pipe 24 near the top of the liquid pumping device 23, and as the temperature of the liquid mixture rises, a shock is applied, making the flash of the liquid mixture more active. is encouraged. At this time, the mixed liquid generates a large amount of bubbles, which form a bubble pump due to the buoyant action of the bubbles, move up the liquid pumping pipe 24, and flow into the gas-liquid separator 25. According to the dual-effect absorption refrigerator of the present invention having the above-described structure, the refrigerant accumulated in the lower part of the evaporator and the liquid accumulated in the condenser are separated. Since the condensed refrigerant accumulated in the refrigerant is mixed in the liquid pumping device and an impact is applied to the mixed refrigerant, the generation of bubbles is ensured. In addition, since a portion of the high-temperature refrigerant vapor from the high-temperature regenerator is injected into the mixed refrigerant, the impact force is further increased, and a stable bubble pump is formed in response to changes in operating conditions. There is no risk of interfering with this at all. Therefore, maintenance is also facilitated.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional dual-effect absorption refrigerator;
The figure is a structural diagram of an example in which a conventional refrigerant pump is omitted and a heat exchanger AI is used. Figure 3 is a structural diagram in which an embodiment of the refrigerant pumping device of the present invention is applied to a dual-effect absorption refrigerator. , FIG. 4 is an explanatory diagram of the refrigerant pumping device of FIG. 3. 2...Absorber 3...Evaporator 4...
...Low wetness regenerator 5...Condenser 7...
...Reservoir part 8 of absorption layer ... Reservoir part of evaporator
12...High temperature regenerator 23...Liquid pumping device 24...Liquid pipe patent applicant Kawasaki Heavy Industries, Ltd.

Claims (1)

[Claims] In a dual-effect absorption refrigerator having an evaporator, an absorber, a condenser, a low-temperature regenerator, and a high-drying regenerator, the refrigerant liquid from the lower reservoir of the evaporator and the refrigerant liquid from the condenser reservoir are mixed in a refrigerant pumping device, the refrigerant vapor from the high-grade regenerating filter is guided to a higher position than the device, and separated into bubbles and refrigerant liquid, and the separated refrigerant liquid is evaporated from a dispersion device. A refrigerant pumping device for a dual-effect absorption refrigerator, which is characterized by dispersing the refrigerant into the container◇