JPS60599Y2 - low temperature generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a low temperature generator used in a dual-effect absorption refrigerator.

A conventional double-effect absorption refrigerating machine will be explained based on FIG. 1. 1 is a high-temperature generator that generates refrigerant bubbles from a dilute liquid using a heater 2 such as a burner; 3 is a high-temperature generator that generates refrigerant bubbles from the high-temperature generator 1; a separator that separates the refrigerant from the pumped dilute liquid; 4 a low-temperature generator that further heats and separates the refrigerant from the intermediate liquid using the refrigerant vapor sent out from the separator 3 as a heat source; and 5 a cooler 6 that separates the refrigerant from the intermediate liquid. A condenser 7 that cools and condenses the refrigerant flowing in from the generators 1 and 4 is configured to obtain cold water for air conditioning from the water cooler 8 by utilizing the latent heat when dispersing and vaporizing the liquid refrigerant from the condenser 5. The evaporator 9 continuously maintains the inside of the evaporator 8 at a low pressure by scattering the concentrated liquid after the refrigerant is separated from the intermediate liquid by the low temperature generator 4 and absorbing the refrigerant vapor inside the vessel. 9 and 10 are low-temperature heat exchangers and high-temperature heat exchangers;
11 is a level tank, these are a liquid lift pipe 12 and a refrigerant pipe 1.
3, 14, refrigerant liquid down-flow pipe 15, dilute liquid pipes 17, 18, 19 with absorption liquid pump 16, intermediate liquid pipe 20 and concentrated liquid pipe 2
The separator 3 and the level tank 11 are connected via a pressure equalizing pipe 22 to form a refrigeration cycle.

In the above configuration, since there is a large pressure difference between the pressure of the high temperature generator 1 and the pressure of the low temperature generator 4, the intermediate liquid flowing into the low temperature generator 4 from the separator 3 flashes when flowing.

Although the degree of this flash varies greatly depending on the cooling water temperature, load size, or operating time, absorption liquid may be mixed into the refrigerant generated in the low temperature generator 4 during flash, or the intermediate liquid may be mixed with the low temperature generator 4. The refrigerant conduit 13 in the container 4 may directly hit the heat transfer tube, or the flow of the absorption liquid in the low temperature generator 4 may be disturbed, which may reduce the performance of the low temperature generator 4 and the durability of the heat transfer tube. There is a problem in that it also hinders miniaturization of the low temperature generator 4.

This proposal has been made in view of the above points, and the embodiment shown in the drawings will be described below.

Reference numeral 23 denotes a cylindrical vessel side, and at the bottom of the vessel side, a group of heat transfer tubes 24 are arranged to allow the refrigerant vapor from the high temperature generator 1 separated by the separator 3 to flow, and are also provided on both sides of the vessel side 23. A steam header 25 and a condensate header 26 surround the ends of the heat exchanger tube group 24 .

Reference numeral 27 denotes an intermediate liquid introduction part having a flash chamber 28 formed in the upper part of the vessel side 23 on the side of the condensate header 26, and the introduction part has a liquid outflow hole 29 and vapor outflow holes 30, 30, 3 on the bottom surface.
The partition plate 31 provided with 0 and the steam outlet holes 30, 30, 3
Eliminator 32 and intermediate liquid introduction pipe 3 provided opposite to 0
It consists of 3.

34 is a refrigerant vapor outlet hole provided on the vessel side 23, 35 is a concentrated liquid pipe, 36 is a refrigerant conduit, and 37 is a refrigerant liquid downflow pipe.

Therefore, the refrigerant flushed from the intermediate liquid in the intermediate liquid introduction part 27 due to the pressure difference between the low temperature generator 4 and the high temperature generator 1 is separated from the intermediate liquid and flows through the vapor outlet holes 30, 30, 30 and the liquid outlet hole 29, respectively. It flows into the vessel side 23.

Therefore, the absorption liquid does not mix with the refrigerant generated by being heated by the refrigerant vapor from the high-temperature generator 1 flowing through the heat transfer tube group 24 in the low-temperature generator 4, and the refrigerant is mixed with the flash refrigerant separated in the intermediate liquid introduction part 27. The steam is sent to the condenser 5 through the steam outlet hole 34.

In addition, since the intermediate liquid from which the flash refrigerant has been separated in the intermediate liquid introduction section 27 flows down to the condensate header 26 side of the vessel side 23 [the side where the thermal energy of the refrigerant flowing in the heat transfer tube group 24 is small], the intermediate liquid that has flowed down There is no possibility that it will flash again.

In this way, the slippage is caused by the flushing of the intermediate liquid.
Since there is almost no turbulence of the absorbing liquid level within the chamber, there is a possibility that small droplets of the absorbing liquid may be mixed into the refrigerant vapor generated within the vessel side 23 or that the intermediate liquid may directly hit the heat transfer tube group 24. small,
Further, the contact area between the absorbent liquid in the vessel side 23 and the heat transfer tube group 24 does not decrease.

The intermediate liquid from which the refrigerant has been separated becomes a concentrated liquid and is sent to the absorber 9 through the concentrated liquid pipe 35.

As mentioned above, in the low temperature generator according to the present invention, the refrigerant is flushed from the intermediate liquid in advance, and then the refrigerant is introduced into the vessel side, and there is a possibility that the intermediate liquid flowing into the vessel side will flash again. Since the size of the refrigerant is also made small, it is possible to effectively prevent absorption liquid from being mixed into the refrigerant introduced into the condenser.

In addition, in the low-temperature generator according to the present invention, there is almost no possibility that the intermediate liquid will directly hit the heat exchanger tube group and accelerate the deterioration of the heat exchanger tubes, and the heat exchange between the absorption liquid in the vessel side and the heat exchanger tube group will deteriorate. Not at all.

That is, the low-temperature generator according to the present invention has improved performance and durability, and can be made smaller and lighter than conventional low-temperature generators, and has high practical value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional dual-effect absorption refrigerator equipped with a low-temperature generator, and FIG. 2 is a block diagram of main parts of a low-temperature generator according to the present invention. 23... Cylindrical vessel side, 24... Heat transfer tube group, 25... Steam header, 26... Condensate header, 27...・Intermediate liquid introduction part, 28・
...Flash chamber, 29...Liquid outflow hole,
30...Steam outflow hole.

Claims (1)

[Scope of utility model registration request] A steam header and a condensate header are provided on both sides of the vessel side so as to surround the ends of a group of heat transfer tubes disposed at the bottom of the vessel side through which refrigerant vapor flows, and at the top of the vessel side on the condensate header side. An intermediate liquid inlet having a flash chamber is formed, and this intermediate/ffl inlet is provided with a liquid outflow hole and a vapor outflow hole, and a liquid outflow port and a vapor outlet are provided in the bottom and top surfaces of the vessel side. A low temperature generator characterized by comprising: