JPH0723824B2 - Automatic extraction device for absorption refrigerator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic bleeder for releasing non-condensable gas in an absorption refrigerating machine to the outside of the absorption refrigerating machine, and particularly to the inside of the machine causing a failure of the refrigerating machine. The present invention relates to an automatic bleeder for an absorption refrigerating machine, which is suitable for grasping leakage of air.

[Conventional technology]

As is well known, a general absorption refrigerator has an automatic bleeder for discharging the non-condensable gas in the machine to the outside of the machine, but in the process of bleeding the non-condensable gas in the machine by the automatic bleeder. Air may leak into the aircraft. if,
If the amount of air leaking into the refrigerator increases, the refrigeration cycle may become abnormal and cause a failure, which may lead to a serious accident in which crystals or the like occur. Therefore, in order to prevent the failure of the refrigerator, it is necessary to know in advance whether there is leaked air into the machine and how much the leaked air is.

The conventional automatic bleeder of the absorption refrigerator is a tank that temporarily stores the non-condensable gas in the machine, and a detector that detects the pressure in the tank and outputs a signal when the pressure reaches a predetermined pressure, The non-condensable gas in the tank is activated by a bleeding pipe and a bleeding drive device for discharging the non-condensed gas in the tank to the outside of the machine, and the bleeding drive device operates when a signal is output from the detector. It is designed to be discharged to the outside of the machine through the extraction pipe. However, no consideration was given to recording the number of bleeds, which is directly related to air leakage into the aircraft. In addition, related to this type of device,
JP-A-60-196572 can be mentioned.

[Problems to be solved by the invention]

The above-mentioned prior art does not consider the point of recording the number of times of bleed air that is directly related to the air leakage into the aircraft, and grasps the presence or absence of the leakage air into the aircraft and the amount of the leakage air. It was impossible. as a result,
At present, when the refrigerator breaks down, the amount of leaked air is being investigated.

An object of the present invention is to record the number of times of bleeding so that the presence or absence of leaked air into the refrigerator and the degree of the leaked air can be grasped in advance, so that a failure of the refrigerator can be prevented in advance. To provide an automatic bleeder.

[Means for solving problems]

The above-mentioned object is a tank for temporarily storing the non-condensable gas in the absorption refrigerator, a detector for detecting the pressure in the tank, and an extraction pipe for discharging the non-condensable gas in the tank to the outside of the machine. And an exhaust pump, and when the pressure in the tank becomes equal to or higher than a set pressure, the exhaust pump is activated by a signal from the detector so that the non-condensed gas in the tank is discharged to the outside of the machine through the extraction pipe. In the automatic bleeder of the absorption refrigerator, which is constituted by the above, it is achieved by providing a counter for recording the frequency (number of times) the exhaust pump is operated.

[Action]

Each time the exhaust pump is activated, the number of times is recorded by the counter. With this record, it is possible to quantitatively grasp the extraction frequency, the change over time of the extraction number, and the extraction amount. Therefore, by collecting data of the extraction frequency of a normal machine, the secular change of the extraction frequency, and the extraction amount in advance, and comparing this data with the data of the target machine, the presence or absence of air leakage and the leakage air Since the amount can be confirmed in advance, breakdown of the refrigerator can be prevented.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. The figure shows a system diagram of an automatic bleeder for an absorption refrigerator according to the present invention. This automatic bleeder comprises a tank 2 for temporarily storing the non-condensable gas in the absorption refrigerator 1 through a bleed pipe 3, and a solenoid valve 5 for discharging the non-condensed gas in the tank 2 to the outside of the machine. It is provided with an attached extraction pipe 4, an exhaust vacuum pump 6 connected to the extraction pipe 4, a pressure detector 7 for detecting the pressure in the tank 2, and a counter 8. The operating contact 6a of the vacuum pump 6 and the electromagnetic piece 5
The operating contact 5a is provided in the control circuit 9 inside the operation panel, the vacuum pump 6 is started and stopped by turning the contact 6a on and off, and the solenoid valve 5 is opened by turning the contact 5a on and off. ， Closed. Further, the contacts 6a, 5a are interlocked with the pressure detector 7, and when the pressure in the tank 2 becomes equal to or higher than a set pressure, it is switched to "ON" at the same time by a signal from the pressure detector 7. . The counter 8 is provided in the control circuit 9 and records the number of times the contact point 6a of the vacuum pump 6 and the contact point 5a of the solenoid valve 5 are turned on and off. In the figure, 10 indicates an oil trap.

Next, the operation of this embodiment will be described.

The non-condensable gas G in the absorption refrigerator 1 is guided to the tank 2 through the extraction pipe 3. The inside of the tank 2 is previously evacuated by the vacuum pump 6 to maintain a vacuum of about 750 mmHgabs, but the pressure rises as the noncondensable gas G is stored. Then, when the pressure in the tank 2 exceeds a set value, the contact 6a of the vacuum pump 6 is generated by the signal from the pressure detector 7.
And the contact 5a of the solenoid valve 5 becomes "ON", and the vacuum pump 6
Is operated and the solenoid valve 5 is opened. As a result, the non-condensable gas in the tank 2 is extracted by the extraction pipe 4, the solenoid valve 5, the oil trap.
10, It is discharged to the outside of the machine via the vacuum pump 6. When the pressure in the tank 2 reaches the initial level of 750 mmHgabs due to this bleeding, the contact 6a of the vacuum pump 6 and the contact of the solenoid valve 5
5a is turned off at the same time, the vacuum pump 6 is stopped, and the solenoid valve 5 is closed. Then, the non-condensable gas is again introduced into the tank 2 to repeat the above operation.
On the other hand, the counter 8 records the number of times the contact point 6a of the vacuum pump 6 and the contact point 5a of the solenoid valve 5 are turned on and off, that is, the number of times of extraction (frequency). With this record, it is possible to quantitatively grasp the extraction frequency, the change over time of the extraction number, and the extraction amount.
Therefore, the bleeding frequency of normal machines, the secular change in the number of bleeding,
By collecting data on the amount of bleed air in advance and comparing it with the data of the target machine, it will be possible to confirm in advance the presence or absence of air leakage and the amount of leaked air. It is possible to prevent a failure of the refrigerator including the heater.

Although the above embodiment has shown the example of the automatic bleeding device using the vacuum pump 6 and the electromagnetic valve 5, it is needless to say that it can be applied to the automatic bleeding device using an ejector or the like as the exhaust pump.

〔The invention's effect〕

According to the present invention, by recording the number of times of bleeding, the presence or absence of leaked air into the refrigerator and the degree of the leaked air can be grasped in advance, whereby failure of the refrigerator can be prevented in advance.

[Brief description of drawings]

The drawings are system diagrams showing an embodiment of an automatic bleeder for an absorption refrigerator according to the present invention. 1 ... Absorption refrigerator, 2 ... Tank, 4 ... Extraction piping,
5 ... solenoid valve, 5a ... contact, 6 ... vacuum pump, 6a ...
Contact, 7 ... Pressure detector, 8 ... Counter.

Claims (1)

[Claims] 1. A tank for temporarily storing the non-condensable gas in the absorption refrigerator, a detector for detecting the pressure in the tank, and a bleed air for discharging the non-condensable gas in the tank to the outside of the machine. A pipe and an exhaust pump are provided, and when the pressure in the tank becomes equal to or higher than a set pressure, the exhaust pump is activated by a signal from the detector to discharge the non-condensed gas in the tank to the outside through the extraction pipe. An automatic bleeder for an absorption chiller, comprising: a counter for recording the frequency (number of times) the exhaust pump operates.