JPH074450Y2 - Non-condensable gas discharge device for absorption refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a non-condensable gas discharge device for an absorption refrigerator, and more particularly to a non-condensed gas discharge device for an absorption refrigerator having a simplified discharge mechanism.

[Conventional technology]

Conventionally, as a non-condensable gas discharge device for an absorption refrigerator, for example, the one shown in Fig. 4 is known. In the figure, the non-condensable gas accumulated in the storage tank 1 during the freezing operation is the cold water or the cooling water discharged from the water chamber 4 after the freezing operation is stopped and the solenoid valves 2 and 3 are normally opened during the solution dilution operation. It is discharged to the outside of the machine by the bleed air ejector 5 which is driven by the like. The check valve 6 provided on the refrigerator side prevents the atmosphere from flowing back to the storage tank 1 when the drive water of the extraction air ejector is stopped, and is provided in series with the solenoid valve 2.

[Problems to be solved by the device]

In the above-mentioned conventional technology, extraction of the non-condensable gas is performed after the refrigeration operation is stopped, and it is not possible to extract the extracted air while the refrigeration operation is continued, so that the storage tank is filled with the non-condensable gas and the pressure increases, There were cases where the refrigeration performance was adversely affected. Further, since the solenoid valve 2 and the check valve 6 are arranged in series between the storage tank 1 and the extraction ejector, the flow passage resistance is large, and in order to increase the ultimate vacuum of the storage tank 1, the extraction ejector 5 is used. It is necessary to increase the flow velocity and flow rate of the driving water to be driven, and the amount of driving water used is increased due to the flow path resistance. Furthermore, regardless of the presence or absence of non-condensable gas in the storage tank, the bleed air discharge operation is performed using the drive water, so the drive water may be wasted.

An object of the present invention is to provide a non-condensable gas discharge device that enables non-condensable gas discharge during a refrigerating operation and that can reduce the amount of extraction ejector drive water.

[Means for Solving the Problems]

The above-mentioned problem is a non-condensable gas storage tank communicated with the low-pressure part of the absorption refrigerator, an extraction means in which the suction fluid inlet is connected to the storage tank by an extraction line, and the extraction line is interposed. In the non-condensed gas discharge device of the absorption refrigerator, which includes a valve, a drive source of the extraction means connected to the extraction means by a drive line, and a valve interposed in the drive line, the drive The valve installed in the pipeline,
An electromagnetic valve that is controlled to be opened and closed by an output signal of a pressure switch that detects the pressure of the non-condensable gas storage tank, and a valve interposed in the bleeding line is provided for the pressure of the non-condensed gas storage tank and the bleeding means. This is achieved by the non-condensable gas discharge device of the absorption refrigerator, which is a differential pressure opening / closing valve that is opened / closed by the differential pressure at the suction fluid inlet.

The above-mentioned problem is also to provide a signal output means that replaces the pressure switch and outputs an open / close signal at a predetermined time interval after integrating the operating time of the refrigerator and elapse of a predetermined operating time. The non-condensed gas discharge device for an absorption refrigerating machine according to claim 1, wherein the valve inserted in the valve is controlled to open / close by a signal output from the signal output means.

[Action]

When the absorption refrigerator is operated and the noncondensable gas is accumulated in the noncondensable gas storage tank, the pressure of the storage tank is gradually increased. When the pressure of the non-condensable gas storage tank reaches a predetermined pressure, the pressure switch that detects the pressure of the non-condensable gas storage tank outputs a signal, and the solenoid valve installed in the drive line receives this signal. Opened. When the solenoid valve is opened, the driving fluid from the drive source of the bleeding means flows into the bleeding means via the solenoid valve, and the bleeding means is driven. When the bleeding means is driven, the pressure on the suction fluid inlet side of the bleeding means decreases, and the differential pressure between the inlet side and the outlet side of the differential pressure on-off valve decreases. The differential pressure on-off valve is set to open when the differential pressure between the inlet side and the outlet side reaches a predetermined value, and when the bleeding means is driven and the differential pressure reaches the predetermined value, the differential pressure on-off valve opens. open. When the differential pressure on-off valve is opened, the non-condensable gas in the non-condensable gas storage tank is sucked and discharged to the extraction means via the differential pressure on-off valve. Non-condensable gas When the non-condensable gas in the storage tank is discharged and the pressure in the storage tank drops, the output signal of the pressure switch changes, the solenoid valve is closed, and the drive of the bleeding means is stopped. It When the driving of the bleeding means is stopped, the pressure drop at the suction fluid inlet of the bleeding means disappears, the differential pressure between the inlet side and the outlet side of the differential pressure on-off valve increases, and the differential pressure on-off valve is closed.

According to the present invention as set forth in claim 2, the operating time of the absorption chiller is integrated instead of the pressure switch, and after a lapse of a predetermined operating time, the valve provided in the drive line is opened / closed at a predetermined time interval. Since a signal output means for outputting a signal is provided, the pressure in the non-condensable gas storage tank is not condensed by checking the refrigerator operating time and the pressure rise amount of the non-condensable gas storage tank in advance and setting the opening / closing time. Evacuation occurs when the gas becomes so high that it needs to be evacuated.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG. Pipeline 12 connected to the low pressure part of the absorption refrigerator 30 (for example, an absorber)
The non-condensable gas separator 11 is provided at the other end of the non-condensable gas separator 11, and the bottom of the non-condensable gas separator 11 is connected to the absorption refrigerator, for example, the bottom of the absorber by a solution line 13. The non-condensing gas separator
A non-condensable gas storage tank 1 communicated with a non-condensable gas pipeline 14 is provided at 11, and the storage tank 1 has a manual valve 10 for communicating the tank with the outside air and a pressure measured by measuring the internal pressure of the tank 1. A pressure switch 7 for outputting a signal and an extraction line 8 are provided. A differential pressure opening / closing valve 9 is provided in the extraction line 8, and the other end of the line 8 is connected to the suction fluid inlet of the extraction ejector 5, which is extraction means. The differential pressure on-off valve 9 is provided with a ball 21 as a valve body therein, and is opened and closed by a differential pressure between an inlet side (non-condensed gas storage tank side) B chamber and an outlet side (bleeding ejector side) A chamber of the ball 21. The valve is provided with a spring 22 for adjusting the opening / closing pressure on the B chamber side. The drive water inlet of the extraction air ejector 5 is connected to the water chamber 4 which is the drive water source by the drive pipe 16 having the solenoid valve 3 interposed, and the solenoid valve 3 is opened and closed by the signal of the pressure switch 7.

During the refrigeration operation, the non-condensable gas flows into the non-condensable gas separator 11 together with the droplets of the solution via the conduit 12, and the non-condensable gas and the droplets are separated in the separator 11. The separated solution flows back to the absorber via the solution line 13, while the non-condensable gas flows via the non-condensable gas line 14 into the non-condensable gas storage tank 1 for storage. Since the noncondensable gas increases as the refrigeration operation continues, the pressure in the storage tank 1 (the pressure of the noncondensable gas) gradually rises, and when the pressure exceeds the first set pressure of the pressure switch 7, the pressure switch 7 A signal is output from the solenoid valve 3 and the solenoid valve 3 is opened. When the solenoid valve 3 is opened, the drive water flows from the water chamber 4 into the bleed air ejector 5, and the ejector 5 operates to reduce the pressure in the A chamber on the outlet side of the differential pressure on-off valve 9 communicating with the suction fluid inlet side. The differential pressure on-off valve 9 opens due to the force of the spring 22 applied to the ball and the differential pressure between the A and B chambers applied to the ball 21, and the differential pressure when the valve opens adjusts the spring 22. It is set in advance, and the valve 9 opens when the pressure on the A chamber side decreases as described above and the differential pressure between the AB chambers becomes smaller than the preset differential pressure. When the valve 9 is opened, the non-condensable gas in the storage tank 1 is sucked and discharged by the extraction ejector 5. When the internal pressure of the storage tank 1 drops with the discharge of the non-condensable gas and drops below the second set pressure of the pressure switch 7, the output of the pressure signal is stopped and the solenoid valve 3 is closed to drive the bleeder ejector 5. Since water does not flow in, the suction force of the ejector 5 disappears, the A chamber in the differential pressure on-off valve 9 becomes atmospheric pressure, the differential pressure between the AB chambers becomes larger than the set value, and the valve 9 closes. Since the discharge of the noncondensable gas is stopped, the backflow of the outside air to the noncondensable gas storage tank is prevented.
The first and second set pressures of the pressure switch 7 need to be set in consideration of the evaporation temperature in the evaporator of the absorption refrigerator. Further, in FIG. 1, the spring 22 in the differential pressure on-off valve 9 is arranged in the B chamber, but it may be arranged in the A chamber to use the spring in the direction of pressing the ball toward the valve seat.

According to the present embodiment, even during the refrigerating operation, the non-condensable gas storage tank internal pressure can be detected and the non-condensable gas can be extracted and discharged. Therefore, the non-condensable gas storage tank internal pressure becomes high and the refrigerating performance is adversely affected. Never. Also,
Since the extracted air is discharged only when the pressure inside the non-condensable gas storage tank becomes high, the extracted ejector drive water is not wastefully consumed. Furthermore, since the number of valves in the extraction line is one, the flow path resistance is reduced, and efficient extraction is possible with a small amount of driving water.

In the second embodiment shown in FIG. 2, the pressure switch 7 provided in the non-condensable gas storage tank 1 is omitted, and the open / close control of the solenoid valve 3 is newly provided with an arithmetic controller 15 which is a signal output means. The difference from the first embodiment is that the time delay operation is performed by. The arithmetic and control unit 15 is a means, such as a timer connected to the power supply of the solution circulation pump of the absorption refrigerator, for accumulating the operating time of the absorption refrigerator, and when the accumulated time reaches a predetermined value, it is determined. And means for outputting a signal to open a valve interposed in the drive line for a period of time. In the present embodiment, the timed operation is set in advance by grasping the relationship between the operating time of the absorption chiller, the non-condensable gas storage tank pressure increase amount and the extraction air ejector drive time, and the non-condensable gas storage tank drop amount. To be done. According to this embodiment, the same effect as that of the first embodiment can be obtained.

In the third embodiment shown in FIG. 3, the water used for driving the extraction ejector is introduced to a cold / hot water system or cooling water system tank 23, and is collected in a water chamber 4 by a pump 24 for reuse. However, there is no waste of water.

[Effect of device]

According to the present invention, the pressure switch for detecting the pressure of the non-condensable gas storage tank is provided, and the valve provided in the drive line is opened / closed by the signal of the pressure switch. Even if non-condensed gas can be extracted, it has the effect of preventing deterioration of refrigeration performance, and since only one valve that is opened / closed by the differential pressure is used for the extraction line, the flow path of the extraction line The resistance is reduced, and there is an effect of reducing the usage amount of the drive source for driving the extraction means.

According to the present invention as set forth in claim 2, the same effect as in the preceding paragraph can be obtained.

[Brief description of drawings]

FIG. 1 is a system diagram showing a first embodiment of the present invention, FIG. 2 is a system diagram showing a second embodiment, FIG. 3 is a system diagram showing a third embodiment, and FIG. [Fig. 3] is a system diagram showing an example of a conventional technique. DESCRIPTION OF SYMBOLS 1 ... Non-condensable gas storage tank, 3 ... Valve (solenoid valve) interposed in a drive pipe line, 4 ... Drive source (water chamber) of extraction means,
5 ... bleeding means (bleeding ejector), 7 ... pressure switch,
8 ... bleeding line, 9 ... differential pressure on-off valve, 15 ... signal output means (arithmetic controller).

Claims (2)

[Scope of utility model registration request] 1. A non-condensable gas storage tank communicated with a low pressure part of an absorption refrigerator, a bleeding means having a suction fluid inlet connected to the storage tank by a bleeding line, and a bleeding line interposed in the bleeding line. In the non-condensed gas discharge device of the absorption refrigerator, which includes a valve, a drive source of the extraction means connected to the extraction means by a drive line, and a valve interposed in the drive line, the drive The valve installed in the pipeline is an electromagnetic valve whose opening and closing is controlled by the output signal of the pressure switch that detects the pressure of the non-condensable gas storage tank, and the valve installed in the extraction pipeline is A non-condensable gas discharge device for an absorption refrigerator, wherein the non-condensable gas storage tank is a differential pressure opening / closing valve that is opened / closed by a differential pressure at a suction fluid inlet of the extraction means. 2. The pressure switch is replaced with a signal output means for accumulating the operating time of the refrigerator and outputting an opening / closing signal at a predetermined time interval after the elapse of a predetermined operating time. The non-condensable gas discharge device for an absorption refrigerator according to claim 1, wherein the interposed valve is controlled to be opened / closed by a signal output by the signal output means.