KR950003126B1 - Refrigerating system - Google Patents

Abstract

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Description

Dual Effect Absorption Chiller

1 and 2 are schematic diagrams of embodiments of the present invention.

3 is a schematic diagram of a conventional example.

4 is a cross-sectional view showing an example of the structure of a magnetic float valve.

* Explanation of symbols for main parts of the drawings

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: nutrient solution pipe 12: liquid level detection room

13 liquid level detector 14 solution flow control valve

15, 16: solution return piping 17: throttle mechanism

18: shaft seal 19: solution piping

20: ball tap magnetic float valve

The present invention relates to a dual-effect absorption chiller having a gas-liquid separator connected by a nutrient solution pipe above a high temperature regenerator and having a solution flow rate control valve in the solution pump discharge side solution path.

In the related art, such a refrigerator has the same configuration as in the system diagram of FIG.

In FIG. 3, reference numeral 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, 8 is a solution pump, 9 is a refrigerant pump. , 10 is a liquid-liquid separator, 11 is a nutrient solution tube, 12 is a liquid level detection chamber, 13 is a liquid level detector, 14 is a solution flow control valve, 15 is a solution return pipe, and 17 is a throttle mechanism.

The dilution solution in the absorber 1 is driven by the solution pump 8 and heated by the low temperature heat exchanger 7 and the high temperature heat exchanger 6 and introduced into the high temperature regenerator 3 and the low temperature regenerator 4.

The solution heated and concentrated in the high temperature regenerator 3 is introduced into the gas-liquid separator 10 by the nutrient solution pipe 11 together with the generated refrigerant vapor and separated into the refrigerant vapor and the solution. Pressure return between the pressure in the gas-liquid separator 10, the pressure H _10m solution column in the gas-liquid separator 10, and the output H _4m solution column in the low temperature regenerator 4, through the liquid level detection chamber 12. It is introduced into the high temperature heat exchanger (16) by heating the dilution solution and then introduced into the low temperature regenerator (4) by the solution return pipe (16) through the throttle mechanism (17).

When the liquid level in the liquid level detection chamber 12 is low, the liquid level detector 13 controls the solution flow control valve 14 in the open direction to prevent the high temperature regenerator 3 from heating to an empty state, and conversely, the liquid level In this case, the liquid level detector 13 controls the solution flow control valve 14 in the closing direction to carry the refrigerant into the refrigerant vapor due to excessive rise of the liquid level in the liquid level detection chamber 12 and the upper gas-liquid separator 101. Not only does it prevent the carry over phenomenon, but also the cavitation phenomenon of the solution pump 8 by the excessive decrease of the amount of the solution in the absorber 1 is prevented.

However, since the nutrient solution action to the gas-liquid separator 10 by the nutrient solution pipe 11 is caused by the bubble pump action by the refrigerant vapor generated in the high temperature regenerator 3, it is difficult to obtain an intermittent and uniform flow rate. It is difficult and the balance with the solution return capability from the solution return pipe 15 is likely to become unstable, and the flow rate is unstable, and the surplus is accumulated as it is, and the deficit appears as the amount of liquid decreases. The liquid level is likely to become unstable. As a result, there is a problem that the control of the solution flow rate control valve 14 by the signal of the liquid level detector 13 tends to be unstable, and when the solution is excessively introduced into the gas-liquid separator 10 through the nutrient solution pipe 11, There is also a problem that the liquid level in the high temperature regenerator 3 is lowered and is heated in an empty state.

In such a refrigerator, a magnetic float valve is disposed in the liquid level detection chamber 12, as shown in FIG. 4, so that the liquid flow rate control valve 14 does not leak out of the freezer.

However, since the valve portion of the magnetic float valve as the solution flow control valve 14 is on the discharge side of the solution pump 8, when the valve portion is on the closing side, the input from the shaft sealing portion of the magnetic float valve becomes high and the result is shown in FIG. As described above, the amount of leaking of the dilute solution into the solution return pipe 15 through the shaft seal 18 becomes a non-negligible amount, causing a problem of lowering efficiency.

In particular, when the freezing load is high and the cooling water temperature is low, the pressure difference between the pressure in the high temperature regenerator 3, that is, the pressure H _{10 m} solution column in the gas-liquid separator 10 and the pressure H _{4 m} solution _{column in the} low temperature regenerator 4 decreases. It is easy to lack the ability. In this case, since the liquid level in the liquid level detection chamber 12 rises and the liquid level detector 13 throttles the solution flow control valve 14, the difference between the solution temperature in the high temperature regenerator 3 and the solution concentration in the absorber 1 is different. There was also a problem that too wide a risk of crystallization.

The present invention solves this problem of the conventional one and stabilizes the liquid level in the liquid level detection chamber so that the solution flow rate control is stable, and even when the magnetic float valve is used, the leaked dilution solution is not introduced into the low temperature regenerator (4). It is an object of the present invention to provide a dual-effect absorption chiller that can prevent a decrease in efficiency.

The present invention provides a dual-effect absorption refrigeration cycle as 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 path connecting them, and a refrigerant path. In the dual-effect absorption chiller having a gas flow separator connected to the high temperature regenerator above the high temperature regenerator and having a solution flow control valve for controlling the flow rate of the solution into the high temperature regenerator in the solution path of the solution pump discharge side. A liquid level detection chamber is provided below, and the liquid level detection chamber receives a solution flowing down from the gas-liquid separator, forms a detection liquid surface at a position lower than that of the gas-liquid separator, and has a liquid level detector for detecting the height of the detection liquid surface. The lower part of the gas-liquid separator is connected to the high temperature solution exchanger via the solution path, and the liquid level detection chamber The lower part of is to provide a dual-effect absorption chiller characterized in that connected to the lower portion of the high temperature regenerator via the solution path to control the solution flow control valve in accordance with the detection signal of the liquid level detector.

An embodiment of the present invention will be described with reference to FIG.

Reference numeral 19 is a solution pipe connecting the lower part of the liquid level detection chamber 12 and the high temperature regenerator 3. The solution return piping 15 connects the lower portion of the gas-liquid separator 10 and the high temperature heat exchanger 6. In Fig. 1, parts having the same reference numerals as those in Fig. 3 have the same construction.

The solution heated and concentrated in the high temperature regenerator 3 is introduced into the gas-liquid separator 10 by the nutrient solution pipe 11 together with the generated refrigerant vapor and separated into the refrigerant vapor and the solution. The separated solution is separated from the lower portion of the gas-liquid separator 10 by the pressure difference ΔHz in the hot regenerator 3, that is, the pressure H _{10 m} solution column in the gas-liquid separator 10 and the pressure H _{4 m} solution _{column in the} low-temperature regenerator 4. Directly introduced into the high temperature heat exchanger (6) by the solution return pipe (15) and the dilution solution is heated and introduced into the low temperature regenerator (4) by the solution return pipe (16) through the throttle mechanism (17).

On the other hand, the solution introduced into the gas-liquid separator 10 excessively by the nutrient solution pipe 11 does not return from the solution return pipe 15 so that the solution flows into the liquid level detection chamber 12 disposed below the gas-liquid separator 10. It is quickly returned to the high temperature regenerator 3 by the solution pipe 19 in the lower part of the liquid level detection chamber 12.

As a result, the liquid level of the liquid in the high temperature regenerator 3 is stably maintained, thereby eliminating the risk of heating in an empty state, and the liquid level of the liquid in the liquid level detecting chamber 12 without the surplus accumulated in the liquid level detecting chamber as in the conventional one. Since it is kept stable, the control of the solution flow rate control valve 14 by the signal of the liquid level detector 13 is also made stable.

In addition, since the solution return port connecting the solution return pipe 15 is located in the lower part of the gas-liquid separator 10, the return resistance is lower than that in the case where the conventional solution return port is located in the lower part of the liquid level detection chamber 12. (= DELTA H _1m solution column-DELTA H _2m solution column), the solution return capability is improved.

In this way, by increasing the solution return capacity (high temperature regenerator 3 to low temperature regenerator 4) by the pressure of the solution injection of Δhm, the liquid level rise in the liquid level detector 12 is prevented (due to the lack of the return capacity) to control the solution flow rate. By preventing the valve 14 from unnecessarily throttling, it is possible to prevent the solution concentration in the high temperature regenerator 3 from becoming excessive and to prevent crystallization.

In addition, the solution return pipe 15 to the high temperature heat exchanger 6 is directly connected to the lower part of the gas-liquid separator 10, and the lower part of the high temperature regenerator 3 is connected to the lower part of the high temperature regenerator 3 by the solution pipe 19 of the lower part of the liquid level detection chamber 12. Since the magnetic float valve shown in FIG. 4 having the functions of the liquid level detector 13 and the solution flow control valve 14 is disposed in the liquid level detection chamber 12, the shaft seal 18 of the magnetic float valve is connected. The dilution solution leaked from) is introduced into the high temperature regenerator 3 without being introduced into the high temperature heat exchanger 6, so that there is no loss and the efficiency is not lowered.

In addition, a ball tap type magnetic float valve may be used instead of the magnetic float valve shown in FIG. 2 is a system diagram of the embodiment, and reference numeral 20 denotes a ball tap type magnetic float valve.

In this method, the piping around the float valve can be reduced, and the cost of the flute valve itself can be reduced, resulting in a significant cost reduction.

According to the present invention, the liquid level of the liquid level detection chamber is stabilized, so that the solution flow rate control is stable, and the liquid level of the high temperature regenerator is stabilized so that there is no risk of heating to an empty state, and even when a magnetic flute valve is used, the concentrated solution returns Diluent solution does not leak into the pipe, and it is possible to put the concentrated solution return port at a high position, which increases the solution return capability, and prevents excessive concentration of the solution, and a cheap ball tap type magnetic float valve can be adopted. Therefore, it is possible to provide safe, controllable, efficient, reliable, and inexpensive dual-efficiency absorption chiller, which is very practical.

Claims (3)

Absorber (1), evaporator (2), condenser (5), high temperature regenerator (3), high temperature solution heat exchanger (6), low temperature solution heat exchanger (7), solution pump (8), solution path connecting them, refrigerant A dual-effect absorption refrigeration cycle is formed in the path, and the gas-liquid separator 10 is connected to the nutrient solution pipe 11 above the high temperature regenerator 3, and the high temperature regenerator 3 is connected to the solution path of the solution pump 8 at the discharge side. In a dual-efficiency absorption chiller having a solution flow control valve 14 for controlling the flow rate of the solution into the tank, a liquid level detection chamber 13 is disposed below the gas liquid separator 10, and the liquid level detection chamber 13 is a gas liquid. The detection liquid surface is formed at a position lower than the liquid surface of the gas-liquid separator 10 by receiving the solution flowing down from the separator 10, and is provided with the liquid-level detector 13 which detects this detection liquid surface height, The said gas-liquid separator 10 The lower part of is connected to the high temperature solution heat exchanger (6) via a solution path, The lower portion of the gas liquid level detection chamber 12 is connected to the lower portion of the high temperature regenerator 13 via a solution path, and the liquid flow rate control valve 14 is controlled by the detection signal of the liquid level detector 13. Dual-effect absorption chiller characterized by. The dual effect absorption chiller according to claim 1, wherein the liquid level detector (13) and the solution flow rate control valve (14) are magnetic float valves. The dual-effect absorption chiller according to claim 2, wherein the magnetically operated valve is a ball tap valve (20).

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