JP3480967B2 - Non-condensable gas discharge device of absorption refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerating machine, and more particularly to a non-condensable gas discharge device for an absorption refrigerating machine which discharges non-condensable gas in the machine.

[0002]

2. Description of the Related Art For example, in Japanese Patent Laid-Open No. 63-233274, an absorption refrigerator having an absorber, a generator, a condenser, an evaporator and the like connected to a pipe is provided with a tank for temporarily storing noncondensable gas. Connect the pipes and install a detector for the pressure in the tank.Connect the exhaust pump to the pipe for discharging the non-condensable gas in the tank. Absorption refrigeration equipped with a counter that activates the exhaust pump in response to a signal to discharge the non-condensed gas in the tank to the outside of the machine through the above piping and records the number of times the exhaust pump is activated (the number of extractions). An automatic bleeder for a machine is disclosed.

Then, the number of times of starting recorded in the counter makes it possible to quantitatively grasp the amount of discharge of the non-condensable gas over time and the amount of discharge.

[0004]

Generally, in an absorption refrigerating machine, the larger the refrigerating capacity is, the larger the amount of non-condensable gas is generated. Therefore, the capacity of one tank or the number of tanks is increased and the non-condensable gas is increased. The amount of storage of water will increase significantly. Then, for example, the capacity of the tank of the absorption refrigerating machine of 100 refrigeration tons is about 20 liters, and the capacity of the tank of 1000 refrigeration tons is about 100 liters, which is a large increase. In the automatic bleeder disclosed in the above-mentioned Japanese Patent Laid-Open No. 63-233274, the set pressure when the exhaust pump is started is the same even in the absorption refrigerator having different refrigerating capacity. Therefore, the discharge time of the exhaust pump differs depending on the absorption type refrigerator with different refrigerating capacity, the refrigerating capacity is large, and a large amount of non-condensing gas accumulates in the tank before the discharge of non-condensing gas from the tank begins. In the refrigerator, there is a problem that the exhaust pump may continue to be discharged for a long time, and the exhaust pump may be overheated, causing a failure.

Further, the leakage of the absorption refrigerator becomes large,
When the amount of noncondensable gas generated increases significantly, the operating time of the exhaust pump becomes longer, and by repeating the discharge operation with such a long operating time, a failure occurs in the exhaust pump and Discharge may be difficult. Furthermore, the number of times of bleeding is recorded in the count, data of bleeding frequency of normal machine, secular change of bleeding frequency, and amount of bleeding air are collected in advance, and these data are compared with the data actually stored in the counter. In order to confirm the presence or absence of air leakage and the amount of leakage, it is necessary to collect the data of the above-mentioned normal machine accurately in advance, and the work for collecting the data becomes very complicated and the data is accurate. If it cannot be collected, there is a problem that it is not possible to accurately confirm the presence or absence of leakage. Further, it is necessary to obtain data for each absorption refrigerator having different refrigerating capacity, which causes a problem that data collection work for confirming air leakage and the like becomes more complicated.

[0006]

In order to solve the above problems, the present invention solves the above-mentioned problems by discharging a non-condensable gas pipe 16 connected to an absorption refrigerator and a vacuum pump 14 connected to the discharge pipe 16.
In the non-condensable gas discharge device configured to discharge the non-condensed gas in the absorption refrigerating machine to the outside of the machine, the on-off valves 17 and 18 provided in the discharge pipe and the discharge on the upstream side of these on-off valves A first pressure detector 21 provided on the pipe and a second pressure detector 22 provided on the discharge pipe downstream of the on-off valve.
When a signal is input from the first pressure detector 21 and the second pressure detector 22 and the detected pressure of the first pressure detector 21 reaches a predetermined discharge start pressure, an operation start signal is sent to the vacuum pump 14. Is output, and when the pressure detected by the second pressure detector 22 reaches the open / close valve open pressure, an open signal is output to the open / close valves 17 and 18, and then the first pressure detector 21 or the second pressure detector 21 or
The control device 23 outputs a close signal to the on-off valves 17 and 18 when the pressure detected by the pressure detector 22 reaches the discharge end pressure. The control device 23 discharges the discharge start pressure and the discharge end pressure.
Display device 33 for confirming the set value of pressure, and start of the discharge
Switch for changing the set value of the pressure and the discharge end pressure.
The present invention provides a non-condensable gas discharge device for an absorption refrigerating machine, which includes an operation panel 31 provided with switches 37, 38, 40, 41 .

Further, the control device 23 uses the vacuum pump 1
After the stop signal of No. 4 is output, again the vacuum pump
Of the vacuum pump 14 until the operation signal of 14 is output.
A timer T that counts a stop time, a counter C that counts the number of times when the count time of the timer T is shorter than a predetermined time, and an abnormal signal is input to operate when the count of the counter C continues for a predetermined number of times. The present invention provides a non-condensable gas discharge device for an absorption refrigerator having a display device 33.

[0008]

By operating the operation panel 31, it is possible to easily set the set pressure when starting the discharge operation according to the capacity of the storage chamber 9 due to the difference in refrigerating capacity of the absorption refrigerator.
It becomes possible to perform the discharge operation of the non-condensable gas according to the refrigerating capacity, and the display device 33 of the operation plate 31, the display (input) switch key 37, the set value according to the absorption refrigerator having the different refrigerating capacity. By operating the change key 38, the set value increase key 40, the set value decrease key 41, etc., each set pressure can be easily changed according to each absorption refrigerator, and the non-condensable gas discharge device has a refrigerating capacity. It can be used in common in different cases, and as a result, it is possible to greatly improve the versatility of the non-condensable gas discharge device, and further, the absorption type having a large refrigerating capacity and a large storage chamber 9 volume. In the refrigerator, the set pressure at which the vacuum pump 14 starts operating is set low by operating the operation panel 31, so that the vacuum pump 1 can be stored before a large amount of non-condensable gas is accumulated in the storage chamber 9.
4 can be started, the operating time of the vacuum pump 14 during the discharging operation can be prevented from becoming long, and the operating time of the vacuum pump 14 during the discharging operation even in the absorption refrigerator having different refrigerating capacity. Can be made almost uniform,
It is possible to reliably perform the discharge operation while avoiding a failure due to overheating of the vacuum pump 14.

[0009] At the end of the discharging operation of the noncondensable gas, said vacuum port of the control device 23 operates, from the operation of the vacuum pump 14 is terminated until the next discharging operation is started
When the stop time of the pump 14 is shorter than the predetermined time, the number of times is counted and an abnormal signal is output when the count continues for the predetermined number of times, so that leakage of outside air into the absorption refrigerator is temporarily non-condensed. It can be reliably detected by distinguishing it from the increase of gas, and at this time, the display of the display device 33 is switched, and the display device 33 acts as a notification device to accurately notify the administrator etc. of the excessive bleeding frequency. It will be possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 are schematic configuration explanatory views of a non-condensable gas discharge device of an absorption refrigerator according to the present invention.
In the figure, 1 is a body of an absorption refrigerating machine, 2 is an absorption liquid reservoir formed under the body 1, and 3 is an absorption liquid pump, 4 and 5
Is a pipe for circulating the absorbing liquid circulating in the absorption refrigerator, 6 is a container for extracting non-condensable gas, 7 is an extraction chamber for non-condensing gas formed in the upper part of the container 6, and 8 is a lower part of the container 6. A non-condensable gas storage chamber 9 formed in the middle part of the container 6, and one end of the gas-liquid separation chamber 8 connected to the extraction chamber 7 and the other end absorbed by the gas-liquid separation chamber 8. A tubular flow-down pipe opened in the liquid, 11 is an extraction pipe having one end connected to the gas phase portion of the body 1 and the other end connected to the extraction chamber, 12 is one end connected to the pipe 5 and the other end is flow-down Absorbing liquid feed pipe opened to the gas phase portion of the pipe 10, 13
Is an absorbent return pipe having one end connected to the bottom of the gas-liquid separation chamber 8 and the other end opened to the upper part of the absorbent reservoir 2 and connected to the body 1.

Further, in FIG. 1, 14 is a vacuum pump,
Reference numeral 14M is a motor for driving the vacuum pump 14, 15 is a trap, and 16 is an exhaust pipe which is an exhaust passage for the non-condensable gas, one end of which is connected to the storage chamber 9 and the other end of which is connected to the trap. Further, on-off valves 17 and 18 which are, for example, solenoid valves are provided in the middle of the discharge pipe 16, a first pressure detector 21 is provided on the upstream side of the on-off valve 17, and a downstream side of the on-off valve 18 is provided. A second pressure detector 22 is provided.

Reference numeral 23 is a control device composed of, for example, a microcomputer. The control device 23 operates by receiving pressure signals from the first and second pressure detectors 21 and 22, and opens and closes the open / close valves 17 and 18. Outputs a signal and drives the motor 14
Output a driving signal to M. The configuration of the control device 23 will be described below. 24 is the first and second pressure detectors 21,
An input interface for inputting a signal from 22 and converting the signal to output it to a central processing unit (hereinafter referred to as CPU) 25. Reference numeral 26 denotes a storage device (hereinafter referred to as ROM) in which a control program related to the present invention is stored. ), 27 is CP
An output interface for inputting a signal from U25 and outputting a signal to the on-off valves 17 and 18, and a signal generator 28 for outputting a signal every predetermined time (for example, 2 seconds) (hereinafter referred to as CLOO).
CK), 30 is a readable and erasable storage device (hereinafter referred to as RAM) that stores the pressure detected by each pressure detector for each signal output from the signal generator 28, and T is after the start of operation of the vacuum pump 14. A timer that counts elapsed time and the like, and C is a counter that counts the number of times when the discharge operation is short.

Reference numeral 31 is an operation plate provided in the control device 23. As shown in FIG. 3, a control power switch 32, for example, a digital display device 33 using a 7-segment light emitting element or liquid crystal, is provided on the operation plate. Automatic control keys 34 for the on-off valves 17,18, manual control keys 35 for the on-off valves 17,18, manual open keys 36 for the on-off valves 17,18, display (input) switching keys 37 on the display device 33, setting value change Key 3
8, a set value increase key 40, a set value decrease key 41, an indicator light 42 for confirming the power supply to the control device 23, and a pump abnormality indicator light 4 that operates when the temperature of the vacuum pump 14 is abnormal.
3 is provided. The automatic control key 34, the manual control key 35, and the manual open key 36 are provided with issuing elements 34a, 35a, and 36a, respectively. When the automatic control key 34 is pressed on the issuing element 43a, the opening / closing valve 17,
Lights in the automatic mode in which opening and closing of 18 is automatically controlled.
Further, the issuing element 35a is turned on in the manual mode in which the manual control key 35 is pressed to open and close the on-off valves 17 and 18 manually. Here, when the manual control key 35 is pressed to switch to the manual mode, the control device 23 immediately outputs an operation signal to the drive motor 14M of the vacuum pump 14. Further, the issuing element 36a is turned on when the open / close valves 17 and 18 are opened in the automatic mode or when the manual open key 36 is pressed to open the open / close valves 17 and 18 in the manual mode.

Further, every time the display switching key 37 is pressed, the storage device 9 detected by the first pressure detector 221 is displayed on the display device 33.
And the pressure of the discharge pipe 16, the reached pressure at the start of the operation of the vacuum pump 14 detected by the second pressure detector 22, the number of discharge operations, the cumulative time of the discharge operation, the start of the discharge operation, that is, the operation of the vacuum pump 14. The pressure detected by the first pressure detector 21 at the start (at the start of the discharge operation), that is, the first pressure that is the pressure in the storage chamber 9
The set pressure of the vacuum pump 14 starts operation and the on-off valve 1
When the second set pressure, which is the pressure detected by the second pressure detector 22 when 7 and 18 are opened, and the on-off valves 17 and 18 are opened to start discharging non-condensable gas and the on-off valves 17 and 18 are closed. The third set pressure (discharging end pressure), which is the pressure detected by the first and second pressure detectors 12 and 22, is sequentially switched and displayed.

Further, when changing the set pressures or the like, the display switching key 37 is operated to display the set value to be changed on the display device 33. Then, set value change key 38
When is pressed, the numerical value of the highest digit of the display device 33 blinks, and at this time, the set value increase key 40 and the set value decrease key 4
Pressing 1 changes the blinking value. When the set value change key 38 is pressed after the numerical value to be set is displayed, the blinking digit changes to the lower digit and the set value increase key 40,
By repeating the operation of the set value decrease key 41 and the set value change key 41, the numerical value of the lower digit is changed to the desired value. After that, the display switching key 37 is pressed to complete the setting.

In the case of the non-condensable gas discharge device connected to the absorption refrigerator having a small refrigerating capacity, the volume of the storage chamber 9 is small and the storage chamber 9 when the pressure in the storage chamber 9 rises to the set pressure. Since the amount of non-condensable gas inside is smaller than that of the large capacity storage chamber installed in the absorption refrigerator with large refrigerating capacity, the discharge time of the non-condensable gas can be shortened when the discharge operation is performed. Is a display switching key 37, a set value change key 38, a set value increase key 40 and a set value decrease key 41.
Is set to a high value, for example, 80 mmHg by operating as described above.

Further, in the case of the non-condensable gas discharge device connected to the absorption refrigerator having a large refrigerating capacity, the volume of the storage chamber 9 is large, and the storage chamber 9 when the pressure rises to a predetermined pressure. Since the amount of the non-condensable gas in 9 is larger than that of the small capacity storage chamber provided in the absorption refrigerating machine having the small refrigerating capacity, it rises to the same pressure as the storage room 9 of the absorption refrigerating machine having the small refrigerating capacity. When the discharging operation is started from, the discharging time becomes longer. For this reason, the above set pressure is displayed on the display switching key 3
7, the set value change key 38, the set value increase key 40, and the set value decrease key 41 are operated as described above to set to, for example, 60 mmHg, which is lower than that of the absorption refrigerator having a small refrigerating capacity.

The ROM 26 has the first and second ROMs.
The programs for opening / closing control of the on-off valves 17, 18 based on the pressure detected by the pressure detectors 21, 22 and the operation of the display device 33 are stored in advance. Hereinafter, in the absorption refrigerator configured as described above, the automatic control key 3
The operation at the time of extracting and discharging the non-condensable gas in the automatic mode in which 4 is pressed and the opening / closing of the opening / closing valves 17 and 18 is automatically controlled will be described.

In the absorption refrigerating machine constructed as described above, the refrigerant vapor (for example, water vapor) and the non-condensed gas in the vessel body 1 pass through the extraction pipe 11 by the ejector action of the absorbing liquid injected from the tip of the pipe 12. Is sucked into the extraction chamber 7.
The sucked refrigerant vapor is absorbed by the ejected absorbing liquid, and the absorbing liquid absorbing the refrigerant vapor flows down the downflow pipe 10 and returns to the body 1 via the gas-liquid separation chamber 8 and the return pipe 13. Further, the non-condensed gas becomes bubbles and flows down the downflow pipe 10 together with the absorbing liquid, flows into the gas-liquid separation chamber 8 and floats, and collects in the storage chamber 9.
The amount of non-condensable gas collected in the storage chamber 9 increases with the passage of time, and the pressure in the discharge pipe 16 communicating with the storage chamber 9 gradually rises. Lastly, the control device 23 outputs a closing signal to the on-off valves 17 and 18, and the on-off valves 17 and 18 are closed. Further, the pressure detected by the first pressure detector 21 in step 1 is R at a predetermined time interval based on the operation of the LOCK 28.
It is stored in AM30.

In step 2, the CPU 25 compares the pressure detected by the first pressure detector 21 with the first set pressure, for example, 80 mmHg, based on the program for discharging the non-condensable gas stored in the ROM 26. It Then, when the detected pressure of the first pressure detector 21 becomes higher than the first set pressure, the CPU 25 operates in step 3 to output an operation signal to the drive motor 14M via the output interface 27. Further, in step 4, the CPU 25 outputs a signal to the timer T, and the timer T starts counting the time after outputting the operation signal.

When the drive motor 14M starts operating,
Liquid trap 15 in the non-condensable gas discharge passage downstream of the on-off valve 18.
The gas in the inside is discharged, and the pressure in the discharge passage, that is, the second
The pressure detected by the pressure detector 22 gradually decreases. Also,
The temperature of the oil in the vacuum pump 14 gradually rises. further,
In step 5, the CPU 25 determines whether the pressure detected by the second pressure detector 22 is lower than the second set pressure, for example, 10 mmHg.

When the detected pressure of the second pressure detector 22 becomes lower than the second set pressure as time elapses, step 6
At, the CPU 25 outputs a signal to the timer T, and the timer T starts counting. Then, when 10 minutes, which is the first predetermined time, elapses in step 7, the CPU 25 operates and outputs an open signal to the on-off valves 17 and 18 in step 8. Open / close valves 17 and 1 by the open signal
When 8 is opened, the non-condensable gas in the storage chamber 10 is drawn by the vacuum pump 14 and discharged. In step 9, each on-off valve 1
The timer T counts the elapsed time after opening 7,18.

Thereafter, in step 10, the pressure detected by the first pressure detector 21 or the second pressure detector 22, that is, the pressure of the discharge pipe 16 and the storage chamber 10 is the third set pressure, for example, 20 mmHg. Determine if lower. When the on-off valves 17 and 18 are opened to discharge the non-condensed gas and the pressure detected by the first pressure detector 21 or the second pressure detector 22 gradually decreases to become lower than the third set pressure, step 11 CPU25 operates at each open / close valve 1
A closing signal is output to 7 and 18, and the on-off valves 17 and 18 are closed. Further, the CPU 25 outputs a closing signal, and at the same time, outputs a signal to the timer T in step 12, and the timer T
Counts the time after each on-off valve is closed. And
In step 13, it is determined whether a predetermined time has passed.
When the timer T counts up after a lapse of a predetermined time, for example, 10 minutes, the timer T is set to the CPU 2 in step 14.
5, the CPU 25 outputs a stop signal to the vacuum pump 14, and the vacuum pump 14 is stopped.

The CPU 25 outputs a stop signal for the vacuum pump 14 and at the same time, outputs a signal to the timer T in step 15, and the timer T counts the time after the vacuum pump 14 is stopped. Then, in step 16, it is determined whether or not a third predetermined time, for example, 30 minutes has elapsed. When the predetermined time has elapsed, the timer T counts up and the count is reset in step 17.

After the vacuum pump 14 is stopped, the pressure detected by the first pressure detector 21 is again compared with the first set pressure in step 2. Then, when the pressure in the storage chamber 10 rises to become higher than the first set pressure by the extraction operation of the non-condensed gas, the discharge operation of the non-condensed gas is started in the same manner as above. It should be noted that it is determined in step 18 whether a fourth predetermined time period, for example, 10 minutes, has elapsed since the operation signal was output to the drive motor 14M in step 5, and the opening / closing valve is continued even after the fourth predetermined time period has elapsed. If the pressure downstream of 18 has not dropped to the second set pressure, the CPU 25 determines in step 19 via the output interface 27 that the operating plate 31 cannot obtain a pressure drop due to the operation of the vacuum pump 14. Outputs a meaning abnormal signal. Then, for example, the first abnormality display of "AL1" is displayed on the digital display device 33 of the operation plate 31 to which this abnormality signal is input. At the same time, the CPU 25 outputs an operation stop signal to the vacuum pump 14,
The vacuum pump 14 is stopped.

Further, in step 8, the CPU 25 outputs an open signal to the open / close valves 17 and 18, and in step 9, the timer T counts the elapsed time after each open / close valve 17 and 18 is opened. Then, it is determined whether the pressure detected by the first pressure detector 21 has dropped to the third set pressure. If the pressure has not dropped to the third set pressure at this time, step 20 It is determined whether or not the count time according to 9, that is, the time after the opening / closing valves 17 and 18 are opened reaches the fifth predetermined time, for example, 5 minutes. Then, when it has not reached, it returns to step 10 again, and it is judged whether or not the pressure detected by the first pressure detector 21 has dropped to the third set pressure.

Then, when the fifth predetermined time has elapsed before the pressure detected by the first pressure detector 21 has dropped to the third set pressure, the timer T counts up and CP
Output a signal to U25. CPU25 which input the signal
In step 21, the CPU 25 outputs an abnormal signal indicating that the discharge is impossible. Then, the second abnormality notification of, for example, "AL2" is performed on the digital display device 33 of the operation plate 31 to which this abnormality signal is input. At the same time, in step 22, the CPU 25 outputs a closing signal to the on-off valves 17 and 18, and the on-off valves 17 and 18 are closed. Further, in step 23, the CPU 25 outputs a signal to the timer T, and the timer T counts the time after closing the on-off valves 17 and 18. Then, in step 24, when the sixth predetermined time, for example, 10 minutes has elapsed, the timer T counts up and CP
Output a signal to U25. CPU25 in step 25
Receives a signal from the timer T, outputs a stop signal to the vacuum pump 14, and the vacuum pump 14 stops.

Further, for example, the CPU 25 judges whether or not the pressure detected by the first pressure detector 21 or the second pressure detector 22 is less than 0 every predetermined time, and if it is less than 0,
The CPU 25 operates to output an abnormality signal that means a detector abnormality. Then, the operation plate 31 to which this abnormal signal is input
The third abnormality notification “AL3” is given to the digital display device 33 of FIG. At this time, if the discharge control is in the automatic mode and the on-off valves 17 and 18 are closed, the CPU 2
5 immediately outputs a stop signal to the vacuum pump 14. When the open / close valves 17 and 18 are open, the CPU 25 immediately outputs a close signal to the open / close valves 17 and 18, and then outputs a stop signal to the vacuum pump 14 after a lapse of a predetermined time. After that, the on-off valve 1
Opening and closing of 7 and 18 are not performed.

Further, it is determined in step 16 whether or not the third predetermined time has elapsed after the CPU 25 outputs the stop signal to the vacuum pump 14 in step 14, and at this time, the third predetermined time If has not elapsed, it is determined in step 26 whether the pressure detected by the first pressure detector 21 has reached the first set pressure. When the detected pressure reaches the first set pressure, the CPU 25 operates in step 27 and counts as the number of times the discharge interval is short. After that, similarly, when the non-condensable gas is discharged and the discharge is completed, the first pressure is output before the third predetermined time elapses after the CPU 25 outputs the stop signal to the vacuum pump 14 in step 26. It is determined whether the pressure detected by the detector 21 reaches the first set pressure. If the detected pressure reaches the first set pressure, the CPU 25 at step 27.
Is operated and is counted as the number of times the discharge interval is short in the same manner as described above, and the number of times of counting is 2 times including the previous time.

Thereafter, the non-condensable gas is discharged again, and after the discharge is completed, the first pressure detection is performed before a predetermined time elapses after the CPU 25 outputs the stop signal to the vacuum pump 14 in step 26. It is determined whether the pressure detected by the device 21 reaches the first set pressure. And the detected pressure is the first
If the set pressure of is reached, the CPU is determined in step 27.
25 operates and counts as the number of times the discharge interval is short. Then, in step 28, it is determined whether or not the number of counts reaches a predetermined number. When the number of times of counting reaches a predetermined number of three times including the number of times up to the previous time, that is, when the state where the discharge interval is short is three times in succession, the CP is determined in step 29.
U25 outputs an abnormal signal indicating that the discharge interval is short and the number of discharges is excessive. Then, in step 30, the fourth abnormality notification of "AL4" is given to the digital display device 33 of the operation plate 31 to which this abnormality signal is input.

Also, the number of times the discharge interval is short is counted, for example, once or twice, which is less than a predetermined number, and then the pressure detected by the first pressure detector 21 becomes the first pressure after the vacuum pump 14 is stopped. When the third predetermined time has elapsed in step 16 before reaching the set pressure, that is, when it is determined in step 25 that the pressure detected by the first pressure detector 21 has not reached the first set pressure, When the predetermined time of 3 has elapsed, the count number up to the previous time is reset in step 30. Then, next time, it will be counted again from the first time.

According to the above embodiment, the display (input) switching key 37 of the display device 33, the set value change key 38, and the set value increase key 4 are provided on the operation plate 31 provided in the control device 23.
0, a set value decrease key 41, etc. are provided. By operating these keys while checking the display device 33, the discharge operation can be performed according to the capacity of the storage chamber 9 due to the difference in refrigerating capacity of the absorption refrigerator. The set pressure at the start can be easily set, and the noncondensable gas discharge operation can be performed according to the refrigerating capacity.

Further, the display (input) switching key 37, the set value change key 38, the set value increase key 40, the set value decrease key 41, etc. of the operation plate 31 are operated according to the absorption type refrigerator having different refrigerating capacity. The set pressure can be easily changed according to each absorption refrigerator, and the non-condensable gas discharge device can be used in common even when the refrigerating capacity is different. The versatility of the device can be greatly improved.

Further, in an absorption refrigerator having a large refrigerating capacity and a large volume of the storage chamber 9, the first set pressure at which the vacuum pump 14 starts operating should be set low by operating the above keys. With this, the operation of the vacuum pump 14 can be started before a large amount of non-condensable gas is accumulated in the storage chamber 9, and it is possible to avoid a long operating time of the vacuum pump 14 during the discharge operation, and to improve the refrigerating capacity. Even in different absorption refrigerators, the operating time of the vacuum pump 14 during the discharging operation can be made substantially uniform, and the discharging operation can be reliably performed while avoiding a failure due to overheating of the vacuum pump 14.

At the end of the discharge operation of the non-condensable gas, when the time from the end of the operation of the vacuum pump 14 to the start of the next discharge operation is shorter than the set time, it is counted, and this count is performed. Since an abnormal signal is output when is continued for a predetermined number of times, leakage of outside air into the absorption refrigerator can be reliably detected by distinguishing it from a temporary increase in non-condensed gas, and at this time, the display The display of the device 33 is switched, and the display device 33 acts as a notification device to accurately notify the administrator or the like of the excessive number of extractions.

The present invention is not limited to the above embodiment, and each set pressure or time is set by appropriately operating the key of the operation plate 31 according to the refrigerating capacity of the absorption refrigerator. .

[0037]

The present invention is a non-condensable gas discharge device for an absorption refrigerating machine constructed as in the above embodiment. According to the invention of claim 1, the upstream side of the on-off valve provided in the discharge passage. A signal is input from the first pressure detector provided in the exhaust passage and the second pressure detector provided in the exhaust passage on the downstream side of the on-off valve to detect the pressure detected by the first pressure detector to a predetermined value. When the discharge start pressure is reached, an operation start signal is output to the vacuum pump, and when the pressure detected by the second pressure detector reaches the open / close valve open pressure, an open signal is output to the open / close valve, and then the first pressure A control device for outputting a closing signal to the on-off valve when the pressure detected by the detector or the second pressure detector reaches the discharge end pressure,
This controller sets the discharge start pressure and discharge end pressure.
Display device for confirming the value, the discharge start pressure and the
Operation with a switch for changing the set value of discharge end pressure
Since it has a panel , even if the refrigerating capacity of the absorption chiller is different and the capacity of the storage chamber that stores non-condensable gas is different, the set pressure when starting the discharge operation can be easily set according to the capacity. The non-condensable gas discharge operation can be performed according to the refrigerating capacity.

Further, by operating the operation panel according to the absorption refrigerator having different refrigerating capacity, each set pressure can be easily changed in accordance with each absorption refrigerator,
The non-condensable gas discharging device can be commonly used even when the refrigerating capacity is different, and as a result, the versatility of the non-condensing gas discharging device can be greatly improved. Furthermore, the above
By changing the set pressure at the start of discharge operation by operating the operation panel, it is possible to make the operating time of the vacuum pump during discharge operation even in absorption refrigerators with different refrigeration capacities. It is possible to reliably perform the discharge operation while avoiding a failure or the like due to overheating.

Further, according to the invention of claim 2, when the closing signal of the on-off valve or the stop signal of the vacuum pump is output, the operation is started and thereafter the pressure detected by the first pressure detector is discharged to a predetermined level. When the count time of the timer that counts the vacuum pump stop time until the start pressure is reached and the vacuum pump starts operating is less than the predetermined time, the counter counts the number of times, and when this count continues for a predetermined number of times, an error occurs. Since the alarm is activated by inputting a signal, it is possible to reliably detect the leakage of outside air into the absorption refrigerator from a temporary increase in non-condensable gas during normal operation, and At this time, the alarm can operate to accurately notify the administrator etc. of the excessive number of bleeds, and as a result,
The absorption chiller can be maintained and managed before the refrigerating capacity is significantly reduced due to a large increase in the non-condensable gas and the refrigerating capacity is significantly impaired.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a non-condensable gas discharge device of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a non-condensable gas extraction device.

FIG. 3 is a front view of a control panel 31.

FIG. 4 is a flow chart for explaining the operation of the non-condensable gas discharge device.

FIG. 5 is a flow chart for explaining the operation of the non-condensable gas discharge device.

FIG. 6 is a flow chart for explaining the operation of the non-condensable gas discharge device.

[Explanation of symbols]

1 Body of absorption refrigerator 14 Vacuum pump 16 discharge pipe 17 First on-off valve 18 Second on-off valve 21 First Pressure Detector 22 Second pressure detector 23 Control device 37 Display switching key 38 Setting value change key 39 Set value increase key 40 Set value decrease key

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F25B 43/04

Claims (2)

(57) [Claims] 1. A non-condensable gas discharge passage connected to an absorption refrigerator and a vacuum pump connected to this discharge passage are provided so that the non-condensed gas in the absorption refrigerator is discharged to the outside of the machine. In the non-condensed gas discharge device described above, an opening / closing valve provided in the discharge passage, a first pressure detector provided in the discharge passage upstream of the opening / closing valve, and a discharge passage provided downstream of the opening / closing valve are provided. A signal is input from the second pressure detector, the first pressure detector and the second pressure detector, and when the detected pressure of the first pressure detector reaches a predetermined discharge start pressure, the vacuum pump An operation start signal is output, and then an open signal is output to the open / close valve when the pressure detected by the second pressure detector reaches the open / close valve open pressure, and then the first pressure detector or the second pressure detector A control device that outputs a close signal to the open / close valve when the detected pressure reaches the discharge end pressure. Equipped, this controller will start discharging
Display device to confirm the set value of pressure and discharge end pressure
And the set values of the discharge start pressure and the discharge end pressure
A non-condensable gas discharge device for an absorption refrigerating machine, comprising an operation panel provided with a switch for changing . 2. A non-condensable gas discharge passage connected to the absorption refrigerator and a vacuum pump connected to the discharge passage are provided so that the non-condensed gas in the absorption refrigerator is discharged to the outside of the machine. In the non-condensed gas discharge device described above, an opening / closing valve provided in the discharge passage, a first pressure detector provided in the discharge passage upstream of the opening / closing valve, and a discharge passage provided downstream of the opening / closing valve are provided. A signal is input from the second pressure detector, the first pressure detector and the second pressure detector, and when the detected pressure of the first pressure detector reaches a predetermined discharge start pressure, the vacuum pump An operation start signal is output, and then an open signal is output to the open / close valve when the pressure detected by the second pressure detector reaches the open / close valve open pressure, and then the first pressure detector or the second pressure detector outputs close signal to close valve when the pressure signal reaches the discharge pressure at the end, then a predetermined time And a control unit for outputting a stop signal to the vacuum pump after between, the controller the vacuum port
After the pump stop signal is output,
Timer that counts the time when the vacuum pump is stopped until the operation signal of the pump is output, a counter that counts the number of times when the count time of this timer is less than a predetermined time, and the count of this counter. A non-condensable gas discharge device for an absorption refrigerating machine, comprising: an alarm that operates by inputting an abnormal signal when a predetermined number of consecutive times has occurred.