JPS6071865A - Absorption type cold and hot medium obtaining machine - 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] (a) Industrial Application Field The present invention relates to absorption type cold/hot medium acquisition machines (hereinafter referred to as "Konofuku no Machine") such as absorption refrigerators, absorption heat pumps, and absorption chiller-heating machines. The present invention relates to this type of machine equipped with a mechanism for measuring the degree of absorption liquid mixed into the refrigerant.

(b) Prior art In this type of machine, when the absorption liquid in the generator is boiled and the refrigerant is separated, small droplets of the absorption liquid are mixed into the separated refrigerant, and this mixture causes the refrigerant to be separated. This deteriorates the function of the evaporator, which causes evaporation, and causes a significant drop in machine operating efficiency.

Therefore, in this type of machine, it is necessary to measure the degree of absorption liquid mixed into the refrigerant.

As a means of this measurement, conventionally, there has been a manual measurement method in which the operation of the machine is stopped and the refrigerant liquid inside the machine is taken out, and then the specific gravity of the removed refrigerant liquid is measured to measure the absorbent concentration. A method is known in which the electrical conductivity of a refrigerant liquid in a refrigerant reservoir of an evaporator is detected to measure the degree to which absorption liquid is mixed in the refrigerant liquid.

However, in the former case, the measurement work is complicated, and in the latter case, if the refrigerant contains even a small amount of mechanical rust or fine metal pieces, the electrical conductivity will change significantly. The problem was that the measurement reliability was poor due to the large noise.

(c) Object of the Invention The object of the present invention is to provide a machine of this type that is equipped with means for accurately and easily measuring the degree of mixing of absorption liquid into refrigerant.

B) Structure of the Invention The present invention detects the difference between the condensation temperature of the refrigerant corresponding to the internal pressure of the condenser and the temperature of the refrigerant liquid in the condenser in this type of machine, and detects the difference between the temperature of the refrigerant and the liquid absorbed into the refrigerant based on this difference. It is designed to measure the degree of contamination.

According to the present invention, since it is possible to know the difference between the temperature of the almost pure refrigerant in the condenser and the actual temperature of the refrigerant mixed with the absorption liquid, it is possible to accurately and easily measure the degree of mixing of the absorption liquid. .

(e) Embodiment FIG. 1 is a schematic structural explanatory diagram showing an embodiment of an absorption type refrigerant/hot medium acquisition machine (hereinafter referred to as this machine) of the present invention. In Figure 1, (1) is a high temperature generator, (2) is a low temperature generator, (
3) is a condenser, (4) is an evaporator, (5) is an absorber, and (6) is a condenser.
) is a low temperature solution heat exchanger, (7) is a high temperature solution heat exchanger, (
8) is a refrigerant pump, (9) is an absorption liquid pump,
These devices include the refrigerant flow pipe Q[1, C4, the refrigerant liquid flow pipe Ql), the refrigerant liquid reflux pipe a), C6, the absorption liquid nozzle pipe c131, Q-Q4), C4), C5 ,Q
51 are connected to form a circulation path for refrigerant [water] and absorption liquid [lithium bromide aqueous solution].

aQ is the combustion heating chamber of the high temperature generator (1), (17) is the heater of the low temperature generator (2), is the heat exchanger of the ai evaporator (4), and is the absorber (5). and condenser (3
) is the heat exchanger, Qυ is a pipe with a valve (g) that supplies fuel to the combustion heating chamber, 0rihan... is a pipe through which combustion gas flows, (c), (c) are, When this machine is used as a refrigerator, a refrigerant such as cold water or cold air is distributed, and when this machine is used as a heat pump, a pipe is used to distribute low-temperature heat source fluid such as waste hot water or waste steam. ), (goods)
, (foundation) distributes cooling fluids such as cooling water and cooling air when used as a refrigerator, and distributes cooling fluids such as hot water and hot air when used as a heat pump. It is a tube through which the medium flows.

(c) is the refrigerant reservoir of the condenser (3), (c) is the evaporator (
4) is a refrigerant liquid reservoir, (27) is an absorption liquid reservoir for the absorber (5), and (c) is an absorption liquid reservoir for the low temperature generator (2). (
6) is the liquid level relay for the refrigerant reservoir (c), and the pump (8)
).

(S+) is a pressure detector that senses the internal pressure of the condenser (3), (Ss) is a temperature detector that senses the temperature of the refrigerant liquid in the refrigerant reservoir (c) of the condenser (3), and (CI ) is a computing unit that receives a signal from the pressure detector (Sl) and calculates the condensation temperature [saturation temperature] of pure refrigerant corresponding to the pressure sensed by this detector, and (C8) is a computing unit (Cυ and Upon receiving a signal from the temperature detector (S,), the difference between the temperature sensed by this detector and the temperature calculated by the calculator (C1) is calculated, and the degree of mixing of the absorption liquid into the refrigerant is determined based on this difference. This detector (hereinafter referred to as mixed dust) has a built-in microprocessor unit and other combination devices in this detector and computing unit (C1). , ), (S,), arithmetic unit (Cυ and decider (C
It is equipped with a mechanism for measuring mixed dust consisting of i).

In addition, (V+) is an on-off valve provided in the pipe all, and 翰 is a pipe for flowing the refrigerant liquid from the refrigerant liquid reservoir (c) to the absorption liquid reservoir, and this pipe is equipped with an on-off valve (V* ) is a preparation. Switching of opening and closing of these on-off valves (Vl) and (V,) is performed by a signal from the above-mentioned measuring mechanism.

Next, an example of the operation of this machine configured in this way will be explained in the second section.
This will be explained with reference to the figures. FIG. 2 is a Duering diagram showing an example of the operation of this machine using water as a refrigerant and a lithium bromide aqueous solution as an absorption liquid.

Now, while the machine is operating, if the internal pressure of the condenser (3), that is, the sensed pressure of the pressure detector (S,) is P+xHg, as can be seen from Figure 2 (0), the pure refrigerant in the condenser (3) The condensation temperature of is t°C. Then, the pressure detector (S
+) and calculates the condensation temperature t°C.

In this case, when almost no absorption liquid is mixed in the refrigerant, the temperature of the refrigerant condensed in the condenser (3) is approximately t.
℃, and the temperature sensed by the temperature detector (S,) also becomes approximately t℃. Then, the determiner (C8) that receives the signals from the temperature detector (S,) and the calculator (C1) detects that the difference between the actual condensed temperature of the refrigerant and the calculated temperature is close to zero, It is determined that almost no absorption liquid is mixed in the refrigerant in the condenser (3). In other words, the measuring mechanism measures the amount of mixed dust to be almost zero.

In addition, in this case, if the absorption liquid mixes into the refrigerant separated by the high temperature generator (1) and low temperature generator (2) for some reason, the condensation temperature of this refrigerant will be higher than the condensation temperature of pure refrigerant. Become. For example, if the condensation temperature of this refrigerant reaches t°C, the temperature detected by the temperature detector (S,) will also be approximately t°C, and the temperature detected by the temperature detector (S) will be approximately t°C. It was detected that the difference between the values was approximately (t'-t)'C, and the absorbent concentration of this refrigerant was approximately a%
)). In other words, the amount of mixed dust is measured to be approximately a%.

When the difference between the actual temperature at which the refrigerant condenses and the calculated temperature exceeds the upper limit (for example, 5°C), the on-off valve (V,)
At the same time as is switched from open to closed, the on-off valve (V,) is switched from closed to open, and the refrigerant liquid in the refrigerant liquid reservoir (E) of the condenser (3) is transferred to the absorption liquid reservoir of the absorber (5). It is so-called blown into the absorption liquid inside.

In this way, the measuring mechanism installed in this machine measures the concentration of the absorbent mixed in the refrigerant in the condenser (3), so it measures the concentration of the absorbent mixed in the refrigerant in the condenser (3). The measurement sensitivity is higher than that of conventional methods that measure the concentration of absorbent mixed in the refrigerant liquid, which is a combination of the refrigerant liquid in the evaporator (4) and the refrigerant liquid in the refrigerant liquid reservoir (1) of the evaporator. In addition, since it detects the condensation temperature of the refrigerant, which changes depending on the degree of contamination with the absorbent, it is possible to detect the absorption Measurement noise due to the influence of impurities other than the agent is small, and measurement reliability is excellent.

In other words, this measurement mechanism can more accurately measure the degree of absorption liquid contamination compared to conventional ones, so it is possible to measure the degree of absorption liquid contamination in the refrigerant. has the practical value of knowing the cause correctly.

In addition, in this measuring mechanism, a specific weight measuring device is provided in the refrigerant liquid reservoir (c) instead of the temperature detector (S,), and
The calculator (Cθ has a function to further calculate the specific weight ρ of the pure refrigerant liquid corresponding to the calculated temperature, and calculates the specific weight ρ′ of the refrigerant liquid mixed with the absorbing liquid, which is the specific weight measured by the measuring tool. Even if the difference from the specific weight ρ is detected by the determiner (C*), it is possible to accurately measure the degree of contamination of the absorption liquid.

(f) Effects of the invention As described above, the absorption type refrigerant/hot medium acquisition device of the present invention automatically detects the difference between the condensation temperature of pure refrigerant in the condenser and the actual temperature of the refrigerant condensed in the condenser. Since it is equipped with a measuring mechanism, it is easier to determine the degree of absorption liquid mixed in the refrigerant than with this type of machine that measures by hand. Compared to this type of machine equipped with a measuring mechanism for detecting the electrical conductivity of the refrigerant, this method has the advantage of being able to accurately determine the degree to which the absorption liquid is mixed in the refrigerant with high reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing one embodiment of the absorption type cold/hot medium acquisition machine of the present invention, and FIG. 2 is a Dueling diagram showing an example of operation of the absorption type cold/hot medium acquisition machine shown in FIG. 1. . (1)...High temperature generator, (2)...Low temperature generator,
(3)... Condenser, (4)... Evaporator, (5
)...Absorber, (C)...Refrigerant reservoir, (C1)
...Arithmetic unit, (C1)...Judgment device, (S,)...
Pressure detector, temperature detector for (St).

Claims (1)

[Claims] (1) A pressure detector that senses the internal pressure of the condenser, a calculator that calculates the condensation temperature of pure refrigerant corresponding to the pressure sensed by this pressure detector, and a temperature detector that senses the temperature of the refrigerant liquid in the condenser. and a measuring mechanism comprising a determination device that determines the degree to which absorbing liquid is mixed into the refrigerant in the condenser based on the difference between the temperature detected by the temperature detector and the temperature calculated by the calculator. An absorption type cold and hot medium acquisition machine featuring: