JPS6237651A - 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 [Industrial Application Field] The present invention has a gas-liquid separator connected above a high-temperature regenerator by a liquid pumping pipe, and a solution flow rate control device in the solution path on the discharge side of the solution pump. The present invention relates to a dual-effect absorption refrigerator with valves.

[Conventional technology]

The inventors invented a refrigerator as shown in the flow diagram of FIG. 3 for the purpose of stabilizing solution flow rate control, and filed an application for this at the same time, and the present invention relates to an improvement of that invention. It is.

In Figure 3, 1 is an absorber, 2 is an evaporator, 3 is a high temperature regenerator, 4 is a low temperature regenerator, 5 is a condenser, 6 is a high temperature heat exchanger, 7 is a low temperature heat exchanger, and 8 is a solution pump. , 9 is a refrigerant pump, 10 is a gas-liquid separator, 11 is a liquid pumping pipe, I2 is a liquid level detection chamber, 13 is a self-cutting float valve in which a float serving as a liquid level detector and a solution flow rate control valve are integrated. , 14 is a solution return pipe, and 15 is a solution communication pipe.

The dilute solution in the absorber 1 is driven by a solution pump 8, heated by a low-temperature heat exchanger 7 and a high-temperature heat exchanger 6, and guided to a high-temperature regenerator 3 and a low-temperature regenerator 4.

The solution heated and concentrated in the high-temperature regenerator 3 is guided to the gas-liquid separator 10 along with the generated refrigerant vapor through the liquid lift pipe 11, where it is separated into refrigerant vapor and solution. Due to the pressure in the vessel 3, that is, the pressure difference between the pressure in the gas-liquid separator 10 and the pressure in the low-temperature regenerator 4, the dilute solution is guided to the high-temperature heat exchanger 6 through the solution return pipe 14, and after being heated, it is transferred to the absorber 1. guided by.

When the solution level in the liquid level detection chamber 12 is low, the solution flow rate control valve built in the self-cutting float valve 13 is controlled in the opening direction,
The high temperature regenerator 3 is prevented from running dry, and if the temperature is high, the solution flow rate control valve of the self-cutting float valve 13 is controlled in the closing direction, and the liquid level detection chamber 12 and the upper gas-liquid separator are Within 10? 8fj, due to excessive rise in liquid level? In the refrigerant method airflow of 8/&, the carryover phenomenon of .
This prevents the cavitation phenomenon.

[Problem that the invention seeks to solve]

However, since the liquid pumping action to the gas-liquid separator 10 by the liquid pumping pipe 11 is due to the bubble pumping action of the refrigerant vapor generated in the high-temperature regenerator 3, it is intermittent and a uniform flow rate cannot be obtained. The liquid level in the gas-liquid separator IO is also relatively unstable. However, since the return port of the solution return pipe 14 and the return port of the liquid level detection chamber 12 are located at the bottom of the gas-liquid separator 10, a stable liquid level is not formed above the solution return port, and the solution return pipe 14
The problem of unstable control of the self-cutting float valve 13, which controls the flow of solution at the solution level in the liquid level detection chamber 12, has not yet been fully resolved. .

The present invention solves the problems that have not been fully solved in the above-mentioned separately filed inventions, and has a dual effect of stabilizing the liquid level in the liquid level detection chamber and stably controlling the solution flow rate. The purpose is to provide an absorption refrigerator.

[Means for solving problems]

The present invention provides an absorber,
A double-effect absorption refrigeration cycle is formed from an evaporator, a condenser, a low-temperature regenerator, a high-temperature regenerator, a high-temperature solution heat exchanger, a low-temperature solution heat exchanger, a solution pump, and a solution path and a refrigerant path connecting these; A gas-liquid separator connected to the high-temperature regenerator 3 by a pumping pipe, and a solution flow rate control valve in the solution path on the discharge side of the solution pump for controlling the amount of solution flowing into the high-temperature regenerator. In the heavy-effect absorption refrigerator, the gas-liquid separator is provided with an overflow weir to form a liquid reservoir, and a liquid level detection chamber is provided downstream of the overflow weir,
A liquid level detector is provided to detect the liquid level in the liquid level detection chamber, the lower part of the gas-liquid separator is connected to the high temperature solution heat exchanger via a solution path, and the lower part of the liquid level detection chamber is connected to the liquid level in the liquid level detection chamber. The present invention provides a dual-effect absorption refrigerator, which is connected to the lower part of the high-temperature regenerator via a path, and the solution flow rate control valve is controlled by a detection signal from the liquid level detector. .

〔Example〕

Next, an embodiment of the present invention will be described based on FIG.

The gas-liquid separator IO is provided with an overflow weir 16 to form a solution reservoir 17, and a liquid level detection chamber 12 is provided downstream of the overflow weir 16. Other parts in FIG. 1 having the same reference numerals as in FIG. 3 have similar structural functions.

The solution heated and concentrated in the high-temperature regenerator 3 is guided along with the generated refrigerant vapor to the gas-liquid separator 10 through the liquid lift pipe 11.
Separated into refrigerant vapor and solution. The separated solution collects in a liquid reservoir 17 formed by an overflow weir 16 at the solution outlet of the liquid pumping pipe 11, and is led to the high temperature heat exchanger 6 by a solution return pipe 14 connected to the bottom of the liquid reservoir 17. , the dilute solution is led to the absorber 1 after heating.

On the other hand, the excess solution guided to the gas-liquid separator 10 by the liquid lift pipe 11 overflows from the overflow weir 16 and flows into the liquid level detection chamber 12 on the downstream side, and is passed from the lower part of the liquid level detection chamber 12 into the connecting pipe. 15, it is promptly returned to the high temperature regenerator 3. Therefore, an overflow liquid level is always present at the return port of the solution return pipe 14 due to the overflow weir 16, the amount of solution returned is stabilized, and the liquid level head is raised, thereby improving the solution return ability. Further, the self-blade type float valve 13 in the liquid level detection chamber 12 operates reliably, and there is an advantage that stable solution flow rate control can be performed.

Note that the solution flow rate control valve may not be integrated with the liquid level detector (for example, a float), but may be provided separately in the dilute solution path and operated by electrical signals or the like.

Further, FIG. 2 shows an example in which the outlet portion of the liquid lift pipe 11 is provided above the overflow liquid level. In Fig. 2, Fig. 1,
Portions with the same reference numerals as in FIG. 3 have similar configurations and portions.

This method has the advantage that the size of the gas-liquid divider 10 can be made smaller than the example shown in FIG. 1 because the amount of solution blown up by the refrigerant stem at the outlet of the liquid lift pipe 11 can be reduced.

〔Effect of the invention〕

According to the present invention, the solution level in the liquid level detection section in the gas-liquid separator of the high-temperature regenerator can be stabilized, and the solution return ability is improved.
A highly reliable dual-effect absorption refrigerator capable of stably controlling the solution flow rate can be provided, and practical use-1, with extremely great effects.

[Brief explanation of drawings]

1 and 2 show flow diagrams of embodiments of the invention,
FIG. 3 shows a flow diagram of a conventional example. 1... Absorber, 2... Evaporator, 3... High temperature regenerator, 4... Low temperature regenerator, 5... Condenser, 6... High temperature heat exchanger, 7... Low temperature heat exchanger, 8... Solution pump, 9... Refrigerant pump, 10... Gas-liquid separator, 11.
...Liquid lift pipe, 12...Liquid level detection chamber, 13...Self-cutting float valve, 14...Solution return pipe, 15...Solution communication pipe, 16...Overflow weir, 17...・Liquid pool.

Claims (1)

[Claims] 1. Absorber, evaporator, condenser, low-temperature regenerator, high-temperature regenerator, high-temperature solution heat exchanger, low-temperature solution heat exchanger, solution pump, and the solution path and refrigerant path connecting these A double-effect absorption refrigeration cycle is formed, and the gas-liquid separator is connected above the high-temperature regenerator with a liquid lift pipe, and the solution flow rate to the high-temperature regenerator is connected to the solution path on the discharge side of the solution pump. In a dual-effect absorption refrigerator having a solution flow control valve for controlling the flow rate, the gas-liquid separator is provided with an overflow weir to form a liquid reservoir, and a liquid level detection chamber is provided downstream of the overflow weir, A liquid level detector for detecting a liquid level in a liquid level detection chamber is provided, a lower part of the gas-liquid separator is connected to the high temperature solution heat exchanger via a solution path, and a lower part of the liquid level detection chamber is connected to the solution path. A dual-effect absorption refrigerating machine, characterized in that it is connected to a lower part of the high temperature regenerator through the liquid level detector, and the solution flow rate control valve is controlled by a detection signal from the liquid level detector. 2. The double-effect absorption refrigerator according to claim 1, wherein the outlet portion of the liquid lift pipe is provided above the overflow liquid level of the solution reservoir.