JP2002295929A - Absorption refrigerating machine and its operating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorption refrigerating machine, and its operating method, in which the lifetime of a palladium cell can be prolonged as much as possible and increase in the volume of H2 generated in the body of the absorption refrigerating machine has no effect on the judgment of the lifetime of the palladium cell. SOLUTION: The absorption refrigerating machine comprises an extractor (4) for evacuating the inside of the absorption refrigerating machine employing an aqueous solution of lithium bromide as a working fluid, an extraction tank (6) for storing gas sucked from the inside of the absorption refrigerating machine (2) by the extractor (4), and a palladium cell (10) for discharging gas sucked from the absorption refrigerating machine (2) to the outside. A subtank (8) for storing sucked gas is provided in a channel (71) interconnecting the extraction tank (6) and the palladium cell (10) and a flow regulation valve (7) is provided in a channel (7a) interconnecting the subtank (8) and the extraction tank (6) wherein the opening of the flow regulation valve (7) is determined by a control means (11) using the pressure of the subtank (8) as a parameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an absorption refrigerator.
In particular, it relates to a mechanism for discharging gas inside an absorption refrigerator to the outside.

[0002]

2. Description of the Related Art In an absorption refrigerator using a lithium bromide (LiBr) aqueous solution as a working medium, it is necessary to evacuate the inside. In a conventional absorption refrigerator 2A whose configuration is schematically shown in FIG. 9, a bleeding device A4 for evacuating the inside of the absorption chiller 2A and a gas sucked from the inside of the absorption chiller 2A by the bleeding device 4A to maintain a vacuum. Extraction tank A to be stored
6 and a palladium cell A10 for discharging the gas in the bleeding tank A6 to the outside to maintain the refrigeration function.

In such an absorption refrigerator 2A using LiBr as a medium, LiBr corrodes metals in the absorption refrigerator 2A to generate H2 gas. Since the H2 gas stays in the absorption refrigerator 2A, the degree of vacuum is reduced.
It is necessary to extract gas and discharge it to the outside atmosphere As.

Here, a vacuum pump can be used if only the H2 gas is discharged. However, when the vacuum pump fails, there is a risk of leakage from the atmosphere As side. For the purpose of eliminating this concern, a palladium cell 10 for discharging the H2 gas in the absorption refrigerator 2A to the atmosphere As via the extraction tank A6 is generally used.

[0005] The performance of the palladium cell A10 decreases with operation, and in the reduced state, when the pressure in the bleeding tank A6 becomes high, damage increases and the life is shortened. When the palladium cell A10 is deteriorated and the H2 gas discharge performance is reduced, the bleeding becomes defective, and the vacuum in the absorption refrigerator 2A cannot be maintained. As a result, the capacity and coefficient of performance of the absorption refrigerator 2A also decrease, and in some cases, the absorption refrigerator 2A becomes inoperable. Therefore, it is desired that the life of the palladium cell A10 is long. However, in the prior art, such a measure was difficult.

In the prior art, a pressure measuring means is provided in the bleeding tank A6, and if the palladium cell A10 is deteriorated and the H2 gas discharging performance is reduced, the pressure in the bleeding tank A6 increases. Upon detecting this, the palladium cell A10 is replaced. However, in addition to the deterioration of the palladium cell A10, the amount of generated H2 gas in the absorption refrigerator 2A may increase. In the related art in which the pressure measuring means A7 is provided in the bleeding tank A6, it cannot be determined whether the pressure is increased due to the deterioration of the palladium cell A10 or the increase in the amount of H2 gas generated inside the absorption refrigerator 2A. Palladium cell A
Even if 10 has not deteriorated, the pressure in the bleeding tank A6 increases, so that there is no need to replace the palladium cell A1.
0 may be exchanged.

[0007] Japanese Patent Application Laid-Open No. Hei 6-137722 discloses a method for judging the extraction state of H2 gas by utilizing a change in pressure in a bleeding tank, operating a vacuum pump used as a discharge device, and issuing an inspection alarm. Has been proposed. But,
Although this method is suitable for proper operation and for issuing an alarm, it has a drawback that the life and replacement time of the palladium cell cannot be determined. Also, the pressure increase in the bleed tank
There is a drawback in that it cannot be determined whether the discharge capacity of the palladium cell is reduced or the refrigerator on the H2 gas generation side is the cause.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and it is possible to extend the life of a palladium cell as much as possible. It is an object of the present invention to provide an absorption refrigerator and an operation method thereof in which an increase in the amount of generated H2 gas inside the absorption refrigerator does not affect the life determination of the palladium cell.

[0009]

As a result of various studies and developments, the inventors have found that the relationship between the damage of the palladium cell and the H2 emission is non-linear as shown in FIG.

In FIG. 10, the vertical axis y indicates the degree of fatigue (instantaneous value), and the horizontal axis indicates the instantaneous value of hydrogen discharge: (dP / dt). Curve A indicates the fatigue characteristic applied to the palladium cell. . Here, P indicates the pressure in the bleeding tank, and dP / dt can be regarded as a substitute characteristic of the load on the palladium cell (A10).

In FIG. 10, for example, the degree of fatigue y at point A1
1 is determined by dP / dt of the instantaneous value x1 of hydrogen discharge, and y2 at the point A2 is determined by dP / dt of x2, and is not in a proportional relationship. Even if the hydrogen discharge amount x2 at the point A2 is twice as large as the hydrogen discharge amount x1 at the point A1, the life of the palladium cell when used at the point A1 (hydrogen discharge amount x1) is equal to the point A2 (hydrogen discharge amount). x2)
Is much longer than twice the life of the palladium cell when used at In other words, the point A2 (the amount of hydrogen emission x
The life of the palladium cell when used in 2) is the point A1
The life is much shorter than half the life of the palladium cell when used at (hydrogen discharge x1). That is, the life is not determined by the total amount of hydrogen discharged, but the palladium cell (A
The life of 10) is determined by the instantaneous value dP / dt of the load applied thereto.
, And its life characteristics are, as shown in FIG.
It was found that the nonlinearity was large.

The absorption refrigerator of the present invention has been created based on the above-mentioned knowledge, and has an air extraction device (4) for evacuating the interior of the absorption refrigerator (2) using a lithium bromide aqueous solution as a working medium. ), An extraction tank (6) for storing the gas sucked from the absorption refrigerator (2) by the extraction device (4), and a palladium cell for discharging the gas sucked from the absorption refrigerator (2) to the outside. 10), and a sub-tank (8) for storing suctioned gas is interposed in a flow path (7a) communicating the bleeding tank (6) and the palladium cell (10). A flow control valve (7) is interposed in a flow path (7a) that communicates between (8) and the bleeding tank (6), and the opening of the flow control valve (7) controls the pressure of the sub tank (8). The control means (1
It is configured to be determined by 1) (claim 1).

The method of operating the absorption refrigerator (2) according to the present invention having the above-described configuration includes a step of detecting a pressure in the sub-tank (8) and a flow control valve () based on the pressure in the sub-tank (8). 7) an opening determination step for determining the opening degree. In the opening degree determination step, the flow rate adjusting valve (7) is set so that the pressure in the sub-tank (8) becomes lower than the reference pressure value in the sub-tank (8). ) Is determined (claim 3).

In a typical absorption refrigerator used for building air conditioning and the like, the vertical axis indicates the instantaneous value (dP / dt) related to the degree of fatigue of the palladium cell A10, and the horizontal axis indicates the elapsed operation time (t). As shown in FIG. 11, the operation time from 8:00 to 20:00 indicated by the line K2 centering on the daytime is set as a driving time with a large instantaneous value (dP / dt), and the operation is often stopped in the early morning and at night. The line K1 is obtained by leveling the operation in 24 hours.
No. 1 shows that the instantaneous value (dP / dt) of the load applied to the palladium cell (A10) is smaller than that of the line K2 and the fatigue can be reduced, so that even if the total amount of hydrogen gas discharged in 24 hours is the same, Will have a much longer life.

According to the present invention having the above structure, the sub-tank (8) is provided in the area between the bleeding tank (6) and the palladium cell (10), and the internal pressure P2 of the sub-tank (8) is adjusted. It is configured so that it can be maintained at a lower level. Therefore, the "apparent" H2 gas partial pressure (the H2 gas partial pressure in the sub tank) of the absorption refrigerator (2) viewed from the palladium cell (10) side is leveled at a low level. If the level is low, the damage characteristics are non-linear, so that damage to the palladium cell (10) is reduced and the life is extended.

Further, according to the present invention having the above-described structure, even if the amount of generated H2 gas increases due to the absorption refrigerator (2), the bleeding tank (6) has a so-called "buffer tank (buffer tank)". ), So that the sub-tank (8) (the tank that will increase in pressure when the capacity of the palladium cell (10) decreases) is located on the absorption refrigerator (2) side. The increase in H2 gas generation hardly affects the life of the palladium cell (10).

Therefore, the pressure P in the sub tank (8)
If the number 2 has increased, it is determined that the palladium cell (10) has deteriorated and the H2 gas discharge performance has decreased, so the palladium cell (10) may be replaced.

In practicing the present invention, the control means (1
1) is configured to determine the opening degree of the flow control valve (7) using not only the pressure P2 in the sub-tank (8) but also the pressure P1 in the bleeding tank (6) as a parameter. Is preferable (claim 2).

In the opening determining step, the opening of the flow control valve (7) is determined so that the pressure P1 in the bleeding tank (6) becomes lower than the reference pressure in the bleeding tank (6). (Claim 4).

When the opening degree of the flow control valve (7) is adjusted, the pressure P1 in the bleeding tank (6) increases and the bleeding device (4)
This is to cope with the case where does not work sufficiently.

Alternatively, another absorption refrigerator (A) shown in FIG.
2) a bleeding device (A4) for evacuating the inside of an absorption refrigerator (A2) using a lithium bromide aqueous solution as a working medium;
An extraction tank (A6) for storing gas sucked from the absorption refrigerator (A2) by the extraction apparatus (A4), a palladium cell (A10) for discharging the gas in the extraction tank (A6) to the outside, and a palladium cell (A10) and a bleed tank (A6), a sub-tank (A8) provided between the sub-tank (A8) and the bleed tank (A6), a flow regulating valve (A7), and a sub-tank (A7). A8) A pressure measuring means (A92) for measuring the pressure (P2) in the inside, and a flow regulating valve (A) based on the measurement result of the pressure measuring means (A92).
7) a control means (A11) for adjusting the opening degree of the palladium cell (A10) and estimating the life of the palladium cell (A10), wherein the control means (A11) determines the fluctuation value of the pressure in the sub-tank (A8). Value determining means, fatigue determining means for determining fatigue of the palladium cell (A10) from the fluctuation value, integrating means for integrating the determined fatigue, and comparing means for comparing the integrated value of fatigue with a reference value. Have. With this configuration, the life of the palladium cell (A10) can be predicted with high accuracy.

The operation method of the absorption refrigerator (A2) shown in FIG. 6 is based on the pressure for measuring the pressure (P2) inside the sub-tank (A8) for storing the gas sucked from the interior of the absorption refrigerator (A2). A measuring step, a pressure fluctuation value determining step of determining a fluctuation value of the pressure (P2) in the sub-tank (A8) from the measured pressure (P2), and a palladium cell (A10) for discharging the gas in the sub-tank (A8) to the outside ) Is determined from the fluctuation value of the pressure (P2) in the sub-tank (A8), a comparison step of comparing the determined integrated value of fatigue with a reference value, and the integrated value of fatigue exceeds the reference value. Issuing a warning in the event of occurrence. By operating in this manner, the life of the palladium cell (A10) is
Prediction can be made with high accuracy, and an alarm is issued by comparison with the reference value of the service life.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an absorption refrigerator and a method of operating the absorption refrigerator according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, an absorption refrigerator (hereinafter abbreviated as a refrigerator) 2 includes a bleeding device 4, a bleeding tank 6,
Flow control valve 7, sub tank 8, palladium cell 10
And a pressure sensor 9P1 for measuring the internal pressure of the bleeding tank 6
And a pressure sensor 9P2 for measuring the internal pressure of the sub tank 8
And control means 11.

The refrigerator 2 is of a negative pressure absorption type using an aqueous solution of lithium bromide as a working medium. In order to maintain the predetermined negative pressure, a bleeding device 4 such as a solution ejector is connected through a pipe 5a in a flow path. It is provided.

As described above, the bleeding device 4 is connected to the refrigerator 2 by the pipe 5a, and is further connected to the bleeding tank 6 by the pipe 5b in the flow path.

The bleeding tank 6 has a function of storing H2 gas, which is a gas sucked by the bleeding device 4,
Sub-tank 8 and palladium cell 10 are exhausted by exhaust pipe 7a.
Is communicated to.

The sub-tank 8 communicates with the bleed tank 6 through a flow control valve 7, is provided to store a controlled and regulated flow of H2 gas from the bleed tank 7, and is connected to the palladium cell 10 by a pipe 7a. ing.

The flow control valve 7 is communicated with a control device 11 as a control means via a command line 11a, and controls the flow rate of H2 gas from the bleeding tank 6 to the sub-tank 8 by controlling the valve opening degree in accordance with the command from the control device 11. It has the function to do.

The palladium cell 10 is provided to discharge the H 2 gas in the sub tank 8 to the atmosphere As.

The pressure sensor 9P1 is connected to the bleed tank 6 by a pipe 6a, and measures the pressure in the bleed tank 6.
The result is provided to be transmitted to the control device 11 via the signal line 12.

The pressure sensor 9P2 is connected to the sub-tank 8 by a pipe 6b, and measures the pressure in the sub-tank 8,
The result is provided to be transmitted to the control device 11 via the signal line 13.

As shown in FIG. 2, the input side of the control device 11 is connected to the pressure sensors 9P1 and 9P2 as described above, and the output side is connected to the flow control valve 7. In FIG. 2, the control device 11 includes a unit B1 for reading the pressure measurement value P1 of the pressure sensor 9P1, a unit B2 for reading the pressure measurement value P2 of the pressure sensor 9P2, and a preset P1 reference. Means B2 for comparing with a value, storage means B3 for storing its P1 reference value, pressure measurement value P2
Means B5 for comparing and determining with the preset P2 reference value
Storage means B6 for storing the P2 reference value.

Further, the control device 11 receives the output of the means B2 for judging the pressure P1 and the output of the means B5 for judging the pressure P2 as inputs and determines means B7 for determining the valve opening of the flow regulating valve 7, Means B8 for transmitting the result of B7. The components other than the means B8 are mainly composed of software.

The operation of the refrigerator 2 having the above configuration will be described with reference to a flowchart shown in FIG. In step S1, the refrigerator operation is started. (Palladium cell 1
Since “0” is a new product, the accumulated use time t is reset to t = 0. )

In step S2, the pressure P1 in the bleeding tank 6 is measured.

In step S3, it is confirmed whether or not the pressure P1 is lower than a predetermined lower limit value P1A of the internal pressure of the bleeding tank 6 (the pressure P1 on the vertical axis and the elapsed time t on the horizontal axis,
The upper and lower limit pressures are represented by P1B and P1A, respectively, and are determined by the lower limit value P1A in FIG. 5). If YES, it means that sufficient bleeding has been performed for the refrigerator, so the process returns to step S2 to continue the operation. N
If O, go to step S4.

In step S4, it is checked whether or not the pressure P1 is equal to or higher than a predetermined upper limit value P1B of the internal pressure of the bleeding tank 6 (determined by the upper limit value P1B in FIG. 5). If yes, go to step S5; if no, go to step S6.

In step S5, the opening degree of the flow control valve 7 is increased to increase the flow rate at which the H2 gas in the bleeding tank 6 is moved to the sub-tank 8. Then, the process returns to step S2.

In step S6, the pressure P2 in the sub tank 8 is measured (the step of detecting the pressure in the sub tank).

In step S7, it is checked whether or not the pressure P2 is equal to or less than a predetermined lower limit of the internal pressure of the sub-tank 8 (the vertical axis is the pressure P2, the horizontal axis is the elapsed time t,
In FIG. 4 in which the upper and lower limit pressures are represented by UL and LL, respectively, it is determined whether or not the reference value P2C−the allowable value ΔP2 = LL: If YES, the valve opening of the flow control valve 7 for increasing the pressure P2 is determined (opening determining step), and the process goes to step S8. If NO, the process proceeds to step S8.
Go to 13.

In step S13, it is checked whether or not the pressure P2 is equal to or higher than a predetermined allowable upper limit value of the internal pressure of the sub tank 8 (in FIG. 4: reference value P2C + allowable value △ P).
2 = UL: It is determined whether or not the value is greater than or equal to). If YES, go to step S14, if NO, go to step S9.

In step S14, the flow control valve 7 is closed to stop the flow of H2 gas into the sub-tank 8, and the pressure P2 in the sub-tank 8 is reduced. Then, the procedure goes to step S9.

In step S8, the valve opening of the flow control valve 7 is increased to increase the internal pressure of the sub tank 8.

In step S9, it is confirmed whether or not the accumulated operation time t has reached a predetermined exchange time of the palladium cell 10. If not, the operation returns to step S2 to continue the operation. If the replacement time has been reached, the procedure goes to step S15 to replace the palladium cell 10 with a new one.
Then, the procedure goes to step S1.

As described above, the palladium cell 10 is set in the low load range, the upper and lower limits UL to
UL, to extend the service life, calculate the service life accurately, and perform the replacement time accurately.

FIGS. 6 to 8 show another embodiment for extending the life of the palladium cell. In FIG. 6, a refrigerator A2 includes an air extraction device A4, a buffer tank A15,
Bleeding tank A6, flow regulating valve A7, sub tank A8
And palladium cell A10 and internal pressure P1 of bleeding tank A6
Pressure sensor A91 as a means for measuring
, A pressure sensor A92 for measuring the internal pressure P2, a control unit A11, and an alarm unit 12.

The refrigerator A2 is of a negative pressure absorption type using a lithium bromide aqueous solution as a working medium. In order to maintain the predetermined negative pressure, a bleeding device 4 such as a solution ejector is connected through a pipe A5a in a flow path. It is provided.

The bleeding device A4 is connected to the refrigerator A2 by a pipe A5a, and further connected to the bleeding tank A6 by a pipe A5b in the flow path.

The bleeding tank A6 has a function of storing H2 gas, which is a gas sucked in the refrigerator A2, and is connected to the sub-tank A8 by an exhaust pipe A7a.

The buffer tank A15 has a function of reducing the pressure fluctuation of the H2 gas sent from the bleeding device A4 to the bleeding tank A6, and is connected to a pipe A5b via a branch pipe A15a.

A flow control valve A7 is interposed in the exhaust pipe A7a, and the flow control valve A7 is connected to the control device A11 by a control line A11c.

The sub-tank A8 is provided to store the H2 gas supplied from the bleeding tank A6, and is provided with an exhaust pipe A7.
It is connected to the palladium cell A10 via a.

The palladium cell A10 is provided to discharge H2 gas to the atmosphere As.

The pressure sensor A91 is connected to the bleed tank A6 by a pipe 91, measures the pressure P1 in the bleed tank A6, and outputs the result to the control means A via a signal line A11a.
11 is provided.

The pressure sensor A92 is connected to the bleed tank A6 by a pipe 92, measures the pressure P2 in the bleed tank A6, and outputs the result to the control means A via a signal line A11b.
11 is provided.

As shown in FIG. 7, the control means A11 has an input side connected to the pressure sensor A92 and an output side connected to the alarm unit A12 via a signal line A12a.
In FIG. 7, a control unit A11 includes a storage unit C21 for storing a pressure measurement value P2 of a pressure sensor A92, and a unit C22 for obtaining a pressure fluctuation value dP2 / dt from the measurement value P2.
And the pressure fluctuation value dP2 / dt from the palladium cell A10
Determining means C23 for obtaining the fatigue degree of fatigue, ie, the degree of fatigue y in FIG. 10, integrating means C24 for integrating the fatigue determined here and integrating the progress of life, and the integrated value of the fatigue obtained by the integrating means C24 and palladium. It comprises a comparing means C25 for comparing and judging a predetermined reference value to replace the cell A10, and an alarm signal outputting means C26 for transmitting an alarm signal based on the comparison result. Each of these means is mainly composed of software.

The alarm unit A12 is configured to receive the output signal of the alarm signal output means C26, and to display a display or / and make a warning sound, a warning light, and the like.

The operation of the refrigerator A2 having the above configuration will be described with reference to FIG.
This will be described with reference to the flowchart shown in FIG. Step S2
In step 1, the palladium cell A10 is made new, and the use time t = 0 and the integrated life value Y = 0 are reset. Then, the refrigerator operation is started. At this time, the pressure P2 in the sub tank A8 is also measured.

In step S22, a time step = dt for measuring the pressure P2 in the sub tank A8 is added, and the elapsed time t = t + dt is set as the measurement integration time.

In step S23, the pressure P2 in the sub tank A8 is measured by the pressure sensor A92 (pressure measuring step). And the increment of the pressure P2 with respect to the step time dt,
That is, dP2 / dt is obtained (pressure fluctuation value determination step).

In step S24, the palladium cell A1
A zero degree of fatigue y is calculated. That is, y = f (dP2 / d
t) is obtained by a characteristic curve corresponding to the previously obtained curve A shown in FIG. 10 (fatigue determination step).

In step S25, the palladium cell A1
A fatigue integrated value Y of 0 is calculated. That is, Y = Y + y × dt is obtained by adding the present fatigue to the accumulated fatigue value Y up to that time.

In step S26, it is checked whether the integrated fatigue value Y obtained in step S25 has reached a predetermined life reference value Q (comparison step). If the life reference value Q is greater than the fatigue integrated value Y, the palladium cell A1
Since the function of 0 is utilized, the process returns to step S22, and the next time interval dt is added to continue the operation. On the other hand, if the fatigue integrated value Y is larger than the life reference value Q, step S2
Go to 7.

In step S27, the alarm unit A12
(A step of issuing an alarm), and the palladium cell A10 whose life has expired is replaced with a new one. Then, the process proceeds to step S21, and the fatigue integration is started again.

As described above, the palladium cell A10
The life of the battery is accurately integrated from the load to make the replacement time appropriate. Also, the bleeding tank A is controlled by the buffer tank A15.
6, the pressure fluctuation to the sub tank A8 is further mitigated, and the life of the palladium cell A10 is extended. Further, by measuring the internal pressure P1 of the bleeding tank A6, which is not described in the above-described operation steps, the sub-tank A8 is measured.
Whether the pressure rise due to palladium cell A10
It becomes clear whether it is caused by the refrigerator A2.

[0067]

The effects of the present invention are listed below. (1) According to the present invention, by providing the sub-tank between the bleeding tank and the palladium cell, the load on the palladium cell is adjusted to a low load, so that the service life can be extended and proper replacement can be achieved. it can. Therefore, it is possible to prevent the performance of the absorption refrigerator from being lowered due to the deterioration of the function of the palladium cell according to the conventional method, which is determined by the service life. (2) In addition, the expensive noble metal palladium cell is not discarded before the function is deteriorated, and the cost is reduced. (3) Further, it is possible to clearly distinguish the deterioration of the palladium cell and the abnormality of the absorption refrigerator which could not be performed conventionally. Therefore, unnecessary replacement of the palladium cell for the cause of the absorption refrigerator is avoided. (4) If a buffer tank is provided between the bleeding device and the bleeding tank, the pressure fluctuation in the bleeding tank is reduced, the transmission of the pressure fluctuation to the sub-tank is further reduced, and the life of the palladium cell is extended.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged detailed view of the control device of FIG.

FIG. 3 is a flowchart for explaining the operation of FIG. 1;

FIG. 4 is an explanatory diagram for keeping the sub-tank pressure at a reference value and extending the life of the palladium cell.

FIG. 5 is an explanatory view for keeping the extraction tank pressure at a reference value and extending the life of the palladium cell.

FIG. 6 is a configuration diagram showing another embodiment of the present invention.

FIG. 7 is an enlarged detailed view of the control device of FIG. 6;

FIG. 8 is a flowchart illustrating the operation of FIG. 6;

FIG. 9 is a configuration diagram of a conventional refrigeration absorber.

FIG. 10 is a characteristic diagram showing the degree of fatigue of a palladium cell that functions to discharge H2 gas.

FIG. 11 is an explanatory diagram showing an example of a load applied to a general refrigerator.

[Explanation of symbols]

 As ··· Atmosphere 9P1, 9P2 ··· Pressure sensor 2 ··· Absorption refrigerator 4 ··· Bleeding device 5a, 5b ··· Tube 6 ··· Bleeding tank 7 ··· Flow control valve 7a ··· Channel tube 8 ... Sub-tank 10 ... Palladium cell 11 ... Control device

Claims (4)

[Claims] 1. A bleeding device for evacuating the inside of an absorption refrigerator using a lithium bromide aqueous solution as a working medium, a bleeding tank for storing gas sucked from the absorption refrigerator by the bleeding device, and a suction from the absorption refrigerator. A palladium cell that discharges the extracted gas to the outside, and a sub-tank for storing the sucked gas is interposed in the flow path that communicates the extraction tank with the palladium cell. A flow regulating valve is interposed in the flow path communicating with
The absorption chiller is characterized in that the opening degree of the flow control valve is determined by control means using the sub tank pressure as a parameter. 2. The control means according to claim 1, wherein not only the pressure in the sub-tank but also the pressure in the bleeding tank is used as a parameter.
The absorption refrigerator according to claim 1, wherein the absorption refrigerator is configured to determine an opening of the flow control valve. 3. The method for operating an absorption refrigerator according to claim 1, further comprising a step of detecting a pressure in the sub-tank and a step of determining an opening of the flow regulating valve based on the pressure in the sub-tank. In the opening degree determining step, the opening degree of the flow control valve is determined such that the pressure in the sub tank is lower than the reference pressure value in the sub tank. 4. The operation of the absorption chiller according to claim 3, wherein in the opening degree determining step, the opening degree of the flow regulating valve is determined such that the pressure in the extraction tank becomes lower than the reference pressure value in the extraction tank. Method.