JPH0447224B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention has a gas-liquid separator connected above a high-temperature regenerator with 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 invention at the same time, but the present invention does not relate to improvements in that invention. be.

In Fig. 3, 1 is an absorber, 2 is an evaporator, and 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, 8 is a solution pump, 9 is a refrigerant pump, 10 is a gas-liquid separator, 11
12 is a liquid lift pipe, 12 is a liquid level detection chamber, 13 is a self-powered 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, 15
indicates a solution communication tube.

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
Together with the generated refrigerant vapor, it is guided to the gas-liquid separator 10 through a liquid lift pipe 11 and separated into refrigerant vapor and solution. The separated solution is guided to the high temperature heat exchanger 6 through the solution return pipe 14 due to the pressure in the high temperature regenerator 3, that is, the pressure difference between the pressure in the gas-liquid separator 10 and the pressure in the low temperature regenerator 4. After heating the dilute solution, it is introduced into the absorber 1.

When the solution level in the liquid level detection chamber 12 is low, the self-powered float valve 13 controls the built-in solution flow rate valve in the open direction to prevent the high temperature regenerator 3 from running dry; To do this, the solution flow rate control valve of the self-powered float valve 13 is controlled in the closing direction, and the liquid level detection chamber 1 is closed.
2 and the carry-over phenomenon of the solution into the refrigerant vapor flow due to an excessive rise in the solution level in the upper gas-liquid separation gas 10, and also prevent the solution from being excessively reduced in the amount of solution in the absorber 1. Cavitation phenomenon of the pump 8 is prevented.

[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, making it difficult to obtain a uniform flow rate. The liquid level within the gas-liquid separator 10 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
Since the return flow rate from
3, the problem of unstable control had 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, 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 connecting these as means for solving the above problems. A double-effect absorption refrigeration cycle is formed from the refrigerant path and the refrigerant path, and a gas-liquid separator is connected above the high-temperature regenerator by a pumping pipe, and 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 that controls the amount of solution flowing into the
The gas-liquid separator is provided with an overflow weir to form a liquid reservoir, a liquid level detection chamber is provided downstream of the overflow weir, and a liquid level detector is provided to detect the liquid level in the liquid level detection chamber. , a lower part of the gas-liquid separator is connected to the high temperature solution heat exchanger via a solution route, a lower part of the liquid level detection chamber is connected to a lower part of the high temperature regenerator via a solution route, and a lower part of the liquid level detector is connected to the high temperature regenerator via a solution route. The present invention provides a dual-effect absorption refrigerator characterized in that the solution flow rate control valve is controlled by the detection signal.

〔Example〕

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

The gas-liquid separator 10 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 a liquid lift pipe 11, and is 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 then passes through the solution return pipe 1 connected to the bottom of the liquid reservoir 17.
4 leads to a high temperature heat exchanger 6, where the dilute solution is heated and then led to an absorber 1.

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 quickly 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 operation of the self-powered float valve 13 in the liquid level detection chamber 12 becomes reliable, 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, parts having the same reference numerals as those in FIGS. 1 and 3 have the same configuration and portions. This method has the advantage that the size of the gas-liquid separator 10 can be made smaller than the example shown in FIG. 1 because the amount of solution blown up by the refrigerant vapor at the outlet of the liquid lift pipe 11 can be reduced.

〔Effect of the invention〕

According to the present invention, it is possible to stabilize the solution level in the liquid level detection section in the gas-liquid separator of a high-temperature regenerator, improve the solution return ability, and improve reliability by stably controlling the solution flow rate. It is possible to provide a high dual-effect absorption refrigerator, which has extremely great practical effects.

[Brief explanation of the drawing]

1 and 2 show a flow diagram of an embodiment of the present invention, and 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-powered float valve, 14...Solution return piping, 15
...Solution connecting 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,
A dual-effect absorption refrigeration cycle is formed by a solution pump, a solution path connecting these, and a refrigerant path, and a gas-liquid separator is connected above the high-temperature regenerator by a liquid pumping pipe, and the solution pump discharges In a dual-effect absorption refrigerator having a solution flow rate control valve in a side solution path for controlling the amount of solution flowing into the high-temperature regenerator, the gas-liquid separator is provided with an overflow weir to form a liquid reservoir, and the overflow A liquid level detection chamber is provided on the downstream side of the weir, and a liquid level detector is provided to detect the liquid level in the liquid level detection chamber, and the lower part of the gas-liquid separator is connected to the high temperature solution heat exchanger via a solution path. The lower part of the liquid level detection chamber is connected to the lower part of the high temperature regenerator via a solution path, and the solution flow rate control valve is controlled by a detection signal from the liquid level detector. Dual effect absorption refrigerator. 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.