KR0161212B1 - Refrigerant quantity control apparatus and its method of ammonia absorptive type airconditioner - Google Patents

Abstract

The present invention solves the problem that when the refrigerant in the condenser is stagnated due to the blocking phenomenon in the pressure reducing valve, the concentration of the strong solution gradually decreases due to overcharging caused by the high purity ammonia solution in the condenser tube being pushed to the condenser side The present invention relates to an apparatus for controlling the flow rate of a refrigerant in an ammonia absorption type air conditioner and a method thereof.

The present invention relates to a liquid crystal display device comprising: a switching transistor which is switched by a predetermined AC power source and receives a flow control signal to a microcomputer; A first sensor and a second sensor for detecting a liquid refrigerant introduced into a pressure reducing valve provided at the upstream and downstream of the refrigerant vapor passage in the condenser, the pressure of the liquid refrigerant flowing into the heat exchanger from the condenser; And a microcomputer for determining whether to overcharge the high purity ammonia solution in the pipe according to the liquid refrigerant detection value detected by the first and second sensors when the flow rate control signal is inputted by the switching transistor, and; And a triac that adjusts the opening degree of the pressure reducing valve in accordance with the control signal outputted from the microcomputer.

Description

Apparatus and method for regulating the flow of refrigerant in an ammonia absorption type air conditioner

1 is a cycle diagram of a conventional ammonia absorption type air conditioner.

FIG. 2 is a block diagram of a refrigerant flow rate control device of an ammonia absorption type cooling and heating apparatus according to the present invention. FIG.

Figure 3 is a timing diagram of the triac drive of Figure 2;

FIG. 4 is a flow chart of a procedure for controlling the refrigerant flow rate of the ammonia absorption type air conditioner according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: condenser 101: refrigerant vapor line

102: switching transistor 103: reducing valve

104, 105: first and second sensors 106: triac

107: Mycom

The present invention relates to the control of the refrigerant flow rate in an ammonia (NH ₃ / H ₂ O) absorption type air conditioner. Especially when the refrigerant in the condenser is stalled due to the blocking phenomenon of the reducing valve, high purity ammonia liquid in the condenser tube flows into the condenser shaft The present invention relates to an apparatus and method for controlling the flow rate of a refrigerant in an ammonia absorption type cooling / heating unit, which solves the problem of gradually decreasing the concentration of a steel solution due to overcharging that occurs due to overcharging, .

FIG. 1 is a cycle diagram of a conventional ammonia absorption type air conditioner.

As shown in the figure, ammonia, which is a refrigerant, is evaporated from a working solution (aqueous ammonia solution) having a high concentration due to heat generated in the burner 1 to obtain an ammonia refrigerant vapor. At the same time, an aqueous ammonia solution (Hereinafter referred to as " weak solution " hereinafter), and a regenerator 2 for condensing the water evaporated together from the refrigerant vapor obtained in the regenerator 2 to obtain a high- A condenser 7 for condensing the liquid refrigerant by using cooling water which is obtained by heat-exchanging the refrigerant vapor obtained from the regenerator 2 with the outside air and then cooling the refrigerant vapor, and a condenser 7 and a refrigerant heat exchanger And an evaporator (9) for evaporating the liquid refrigerant through the evaporator (11) sequentially from the indoor unit by using cold water whose temperature has risen to make the refrigerant vapor; and an evaporator A refrigerant heat exchanger 11 for exchanging heat of the refrigerant vapor generated in the evaporator 9 and a refrigerant heat exchanger 11 for receiving the refrigerant vapor generated from the evaporator 9 through the refrigerant heat exchanger 11, (14) for making the weak solution obtained in the solution cooling absorber (13) into a strong concentrated solution by continuous absorption action, and an absorber (14) for absorbing the weak solution obtained in the absorber And a solution pump 15 for feeding the solution of the steel made in the step (14) to the rectifier (6).

In the figure, reference numeral 4 denotes an exhaust gas flow path for discharging exhaust gas generated during combustion, reference numeral 5 denotes an analyzer, and reference numerals 8, 10 and 12 denote restrictor, which is a pressure reducing valve.

The operation of the conventional ammonia absorption type air conditioner constructed as described above will be described below.

First, in the absorber coil in the absorber 14, a continuous absorption action causes the weak solution having a weak ammonia concentration to become a rich solution of ammonia concentration, which is pumped by the solution pump 15 And flows into the regenerator 2 via the rectifier 6.

This steel solution is heated by the burner 1 in the regenerator 2 in the combustion section 3 to be converted into a weak solution by evaporation of the ammonia refrigerant and the pressure is lowered by the restrictor 12, 13).

On the other hand, the ammonia vapor evaporated in the regenerator 2 flows through the after-rectifier 6 through the analyzer 5 into the condenser 7 as ammonia vapor having a high purity and a low temperature, The refrigerant vapor is cooled with cooling water flowing to the shell side or an intermediate medium such as Brine to produce liquid refrigerant.

This ammonia liquid refrigerant flows down through the restrictor 8 and flows through the inner tube of the refrigerant heat exchanger 11. At this time the low temperature vapor refrigerant flowing through the outer tube of the refrigerant heat exchanger 11 Evaporated refrigerant), the liquid refrigerant is sub-cooled and the vapor refrigerant is heated to increase the efficiency.

The subcooled liquid refrigerant that has passed through the refrigerant heat exchanger 11 is pressure-reduced again by the restrictor 10 and when the evaporator 9 absorbs heat from the intermediate medium and evaporates, the cold water is cooled .

This cold water is supplied to an indoor unit (not shown in the drawing) by a circulation pump (not shown in the figure).

The evaporated vapor refrigerant enters the outside through the external conduit of the refrigerant heat exchanger (11), subcools the liquid refrigerant flowing in the inner tube, and then enters the solution cooling absorber (13).

The vapor refrigerant generated in the evaporator 9 enters the solution-cooling absorber 13 into which the solution is introduced and is absorbed by the solution to form a slight low pressure to enable continuous flow.

The high-temperature weak solution flowing from the regenerator 2 flows into the spray plate and then falls and falls on the surface of the heat-exchanging coil through which the low-temperature steel solution flows, thereby cooling the vapor refrigerant and accelerating absorption of the vapor refrigerant, .

Here, the weak solution flows into the absorber 14 in an incomplete aqueous solution state, not completely absorbed by the refrigerant, and continues to absorb and cool as the solution is cooled by the medium medium.

This steel solution is pumped by the solution pump 15 at a relatively low temperature and flows into the rectifier 6 where heat exchange with the high temperature refrigerant vapor is performed in the rectifier 6 and the heat exchange coil in the solution cooling absorber 13 Exchanges heat with the high temperature solution while passing through the upper part of the regenerator 2 after the temperature is raised.

The temperature rise of the steel solution serves to increase the efficiency of the system due to the preheating effect, and the steel solution introduced into the regenerator 2 continuously maintains the freezing action by repeating the above-described procedure in sequence.

However, in such a conventional ammonia absorption type cooling and heating apparatus, when the refrigerant condensed in the tube in the condenser is stagnated due to the blocking phenomenon in the pressure reducing valve as the restrictor, that is, when the amount of the liquid refrigerant flowing into the evaporator is small, The overcharging phenomenon occurs in which the high-purity ammonia liquid refrigerant is concentrated to the condenser side because it occupies more than the steady state. Therefore, there is a problem that the concentration of the steep solution gradually decreases when the system is continuously operated.

As a result of such a problem, the cycle of the system becomes abnormal.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a high-purity ammonia solution in a condenser tube, The present invention also provides an apparatus and method for adjusting the flow rate of a refrigerant in an ammonia absorption type cooling / heating unit, which solves the problem of abnormal operation of the system cycle due to overcharging of the steel solution caused by overcharging.

According to an aspect of the present invention,

A switching transistor which is switched by a predetermined AC power source and inputs a flow control signal to the microcomputer; A first sensor and a second sensor for detecting a liquid refrigerant flowing into a pressure reducing valve provided at the upstream and downstream of the refrigerant vapor flow path in the condenser and lowering the pressure of the liquid refrigerant flowing into the evaporator; And when the flow rate control signal is input by the switching transistor, it is determined whether or not to overcharge the high purity ammonia solution in the condenser tube according to the liquid refrigerant detection value detected by the first and second sensors, and a triac attenuation control signal is generated A microcomputer; And a triac controlling the opening of the pressure reducing valve in accordance with a point angle control signal output from the microcomputer.

A method for attaining the object of the present invention is a method for detecting a liquid refrigerant flowing into a pressure reducing valve that is provided at upstream and downstream of a refrigerant vapor passage in a condenser, A first step of searching an output signal of the first and second sensors; A second step of outputting a control signal of the triac so as to maximize the opening degree of the pressure reducing valve in order to prevent the high purity ammonia liquid from being overcharged to the condenser side when the output signal of the first sensor is present; When there is no output signal from the first sensor and there is an output signal from the second sensor, a tear-off angle adjusting signal of the triac is outputted so that the opening degree of the reducing valve is at an intermediate level in order to prevent the high purity ammonia liquid from being overcharged to the condenser side A third step; And a fourth step of determining a normal case when there is no output signal from the first sensor and the second sensor and outputting a tach angle adjustment signal so that the opening of the pressure reducing valve is minimized.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of a refrigerant flow rate control apparatus of an ammonia absorption type cooling and heating apparatus according to the present invention.

A condenser 100 for condensing the refrigerant vapor through the rectifier in the outdoor unit with external air and then using the cooling water to cool the refrigerant to liquid refrigerant, a refrigerant vapor passage 101 through which the refrigerant vapor passes, A switching transistor 102 which is switched by the alternating current power source of the refrigerant vapor passage 101 and inputs a flow rate control signal to the microcomputer, The first and second sensors 104 and 105 detect the liquid refrigerant flowing into the pressure reducing valve 103. When the flow control signal is inputted by the switching transistor 102, A microcomputer 107 for detecting whether or not overcharging the high purity ammonia solution in the condenser tube according to the liquid refrigerant detection value detected by the microcomputer 104 (105) and generating a triac 106 tachometer control signal; 107 And a triac 106 for adjusting the opening degree of the pressure reducing valve 103 in accordance with the control signal.

In the figure, reference numeral 108 denotes a liquid refrigerant passage, and 109 denotes a liquid refrigerant.

The operation and effect of the refrigerant flow rate control apparatus according to the present invention will be described with reference to FIGS. 3 and 4.

First, when a commercial AC power source (60 Hz, 110 V / 220 V) is applied, it is transformed into an arbitrary AC power source (60 Hz, 5 V) and applied to the base of the switching transistor 102, The switching transistor 102 is turned off and applies a high signal (+ 5V) to the microcomputer 107 as a flow rate control signal.

When the flow rate adjustment signal is input as a high signal as described above, the microcomputer 107 searches the input signals of the first and second ports AD1 and AD2, which are analog / digital ports, And the output signal of the second sensor 104 (105).

That is, when the power is supplied and the ammonia absorption type cooling / heating unit is driven, the condenser 100 draws refrigerant vapor through the rectifier through the refrigerant vapor flow path 101, condenses and discharges the liquid refrigerant as liquid refrigerant, The first sensor 104 is installed in the upstream portion of the refrigerant vapor passage 101 and flows into the evaporator 101. The first sensor 104 is installed in the upstream portion of the refrigerant vapor passage 101, And the second sensor 105 is mounted on the downstream side of the refrigerant vapor passage 101 to detect the liquid refrigerant.

The first and second sensors 104 and 105 detect the liquid refrigerant and the detected value is converted into a digital signal through the first and second analog / digital input ports in the microcomputer 107, ).

The microcomputer 107 first searches for the output signal of the first sensor 104 and if it is 1 (if it is not 0), the ammonia liquid refrigerant having high purity in the condenser pipe flows through the first sensor 104 and the second sensor 105, It is considered that a large amount of liquid refrigerant is contained in the condenser pipe, so that the supercooled state is observed in the system side, and the river solution having a high ammonia concentration as the condenser of each system component is damaged. The control signal is generated so as to minimize the firing angle of the triac 106 as shown in FIG. 3 (b) so that the pressure reducing valve 103 ) Is maximized.

By doing so, the ammonia liquid having a high concentration flows into the evaporator through the liquid refrigerant, thereby stably operating the system.

When the output of the first sensor 104 is 0 and the output of the first sensor 105 is 1, that is, the condensate is supplied between the first sensor 104 and the first sensor 105 installed in the pipe, So that the opening angle of the pressure-reducing valve 103 is intermediate, so that the opening angle of the pressure-reducing valve 103 is set to be intermediate, by generating the firing angle control signal as shown in (c) of FIG.

By doing so, the flow rate is adjusted so that the condensate is held to the right of the first sensor 105, that is, near the outlet of the condenser.

Finally, when the output signal of the first sensor 104 is 0 and the output signal of the first sensor 105 is 0, as soon as the condensed liquid refrigerant in the condenser 100 is condensed, (Not shown in the drawing) through the valve 103 so that the opening angle of the triac 106 becomes as shown in (d) of FIG. 3 so that the opening degree of the pressure reducing valve 103 is small, that is, do.

In this case, the triac drive drives an internal timer to count the passage of time, and if the count value is greater than or equal to the threshold angle, the triac 106 is driven to adjust the opening of the pressure reducing valve 103 .

As described above, according to the present invention, the refrigerant detection sensor is installed in the condenser tube to detect the state of the liquid refrigerant and adjust the opening degree of the pressure reducing valve according to the detection result, so that the high concentration ammonia liquid refrigerant condensed in the condenser tube is concentrated There is an effect that it can be prevented.

In addition, since the concentrated ammonia liquid refrigerant condensed as described above is prevented from being concentrated inside the condenser tube, the concentration of the solution of the strong solution and the solution of the weak solution can be kept constant, and the stable operation can be achieved.

Claims (2)

A switching transistor which is switched by a predetermined AC power source and inputs a flow control signal to the microcomputer; A first sensor and a second sensor for detecting a liquid refrigerant flowing into a pressure reducing valve provided at the upstream and downstream of the refrigerant vapor flow path in the condenser and lowering the pressure of the liquid refrigerant flowing into the evaporator; A microcomputer for determining whether to overcharge the high purity ammonia solution in the pipe according to the liquid refrigerant detection value detected by the first and second sensors when the flow rate control signal is input by the switching transistor, and; And a triac controlling an opening degree of the pressure reducing valve according to a firing angle control signal output from the microcomputer. And an output signal of the first and second sensors, which are provided at upstream and downstream of the refrigerant vapor passage in the condenser, when the flow rate control signal is inputted to detect the liquid refrigerant flowing into the pressure reducing valve that lowers the pressure of the liquid refrigerant flowing into the heat exchanger from the condenser, A first step of searching for a search result; A second step of outputting a control signal of the triac so as to maximize the opening degree of the pressure reducing valve in order to prevent the high purity ammonia liquid from being overcharged to the condenser side when the output signal of the first sensor is present; When there is no output signal from the first sensor and there is an output signal from the second sensor, a tear-off angle adjusting signal of the triac is outputted so that the opening degree of the reducing valve is at an intermediate level in order to prevent the high purity ammonia liquid from being overcharged to the condenser side A third step; And a fourth step of determining a normal case when there is no output signal from the first sensor and the second sensor and outputting a fuzzy threshold control signal so that the opening of the reducing valve is minimized, Of the refrigerant flow rate.