JPH11118299A - Gas extractor for absorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stream extractor for an absorption refrigerator which eliminates suction of dust or the like in the atmospheric air into a vacuum pump otherwise causing a drop in the ultimate degree of vacuum and a trouble while achieving a lower cost. SOLUTION: In a steam extractor for an absorption refrigerator in which an absorption refrigerating machine 7 and a vacuum pump 1 are connected by an extraction pipe 5 having automatically open/close valves 9 and 10 to discharge a non-condensed gas within the absorption refrigerator two automatically opening/closing valves 9 and 10 are arranged in series to make a double shielding structure, and an automatically opening/closing valve 11 for introducing air and a filter 12 are arranged between the automatically opening/closing valve 10 and the vacuum pump 1. At the stopping and/or starting of the vacuum pump 1, air is introduced into the vacuum pump 1 through the automatically opening/closing valve 11 and the filter 12, and a vacuum checking sensor 17 is provided between mounting parts of the automatically opening/closing valve 10 and the automatically opening/closing valve 11 for introducing air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bleeding device for an absorption refrigerator for discharging non-condensable gas in the absorption refrigerator to the outside of the refrigerator.

[0002]

2. Description of the Related Art FIG. 6 shows a configuration example of a conventional bleeding device for an absorption refrigerator. In the figure, reference numeral 7 denotes an absorption refrigerator. The non-condensable gas in the absorption refrigerator 7 is sucked by activating the motor 2 and driving the vacuum pump 1, and first passes through the bleed pipe 5 through the storage tank 3. In the storage tank, the non-condensable gas and the solution are gas-liquid separated, and the non-condensable gas passes through the bleed pipe 5, is sucked into the vacuum pump 1 via the automatic opening / closing valve 9, and is discharged from the exhaust pipe 8 of the vacuum pump 1. Is done.
Then, the pressure in the bleed pipe 5 is detected by the pressure switch 4 and the automatic opening / closing valve 9 is controlled by the signal.

[0003]

In the above-described conventional bleeding apparatus for an absorption refrigerator, when the vacuum pump 1 is stopped, an air introduction opening / closing valve (leak port) not shown.
Is opened to introduce air into the vacuum pump. At the time of this air introduction, dust and the like in the atmosphere are sucked into the vacuum pump, causing the ultimate vacuum degree of the vacuum pump 1 to decrease or causing a failure or the like. There was a problem that. In addition, vacuum pump 1
Also, since the control unit for controlling the automatic opening / closing valve 9 is different from the control unit, there is also a problem that the cost of the apparatus becomes high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is possible to eliminate the above-mentioned problems and reduce the ultimate vacuum degree or cause a failure by sucking dust or the like in the atmosphere into a vacuum pump. It is an object of the present invention to provide a low-cost and low-cost extraction device for an absorption refrigerator.

[0005]

According to a first aspect of the present invention, an absorption refrigerator is connected to a vacuum pump by a bleed pipe having an automatic on-off valve, and non-condensable gas in the absorption refrigerator is removed. In the bleeding device of the absorption chiller that discharges, an automatic on-off valve and a filter are provided between the automatic on-off valve and the vacuum pump, and a vacuum pump is provided between the automatic on-off valve and the vacuum pump. At the time of stop and / or start, air is introduced into the vacuum pump through the air introduction automatic opening / closing valve and the filter, and the degree of vacuum is set between the automatic opening / closing valve and the mounting portion of the air introduction automatic opening / closing valve. It is characterized by providing a confirmation sensor.

[0006] The invention described in claim 2 is the invention according to claim 1.
In the bleeding device for the absorption refrigerator described in the above, an automatic opening / closing three-way valve in which the automatic opening / closing valve for the air introduction automatic opening / closing valve and the air introduction automatic opening / closing valve among the two automatic opening / closing valves are integrated. It is characterized by.

[0007] The invention according to claim 3 provides the invention according to claim 1.
Or in the bleeding device of the absorption refrigerator according to 2, a vacuum tank is provided between the two automatic opening / closing valves or between the automatic opening / closing valve and the automatic opening / closing three-way valve, and a vacuum degree confirmation sensor is provided in the vacuum tank. It is characterized by having.

[0008] The invention described in claim 4 is the first invention.
In the bleeding device for an absorption refrigerator according to any one of the above-described embodiments, a storage tank for collecting and storing non-condensable gas in the absorption refrigerator is provided at a connection portion between the absorption refrigerator and the extraction pipe.

The invention described in claim 5 is the first invention.
The bleeding device for an absorption refrigerator according to any one of the first to fourth aspects, wherein the automatic bleeding device is configured to be controlled by a control unit of the refrigerator.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of the bleeding device of the absorption refrigerator of the present invention. In the figure, reference numeral 7 denotes an absorption refrigerator, and reference numeral 3 denotes a storage tank provided on a side of the absorption refrigerator. A vacuum pump 1 is connected to the storage tank via a bleed pipe 5 provided with two automatic on-off valves 9 and 10 in series. An air opening / closing valve 11 is connected to the bleed pipe 5 between the automatic opening / closing valve 10 and the vacuum pump 1, and the filter 1 is connected to the air introduction automatic opening / closing valve 11.
2 are connected.

A vacuum confirmation sensor 17 is provided in the bleed pipe 5 between the automatic opening / closing valve 10 and the vacuum pump 1, and the output of the vacuum confirmation sensor 17 is provided in the absorption refrigerator 7. Is output to the control unit 13 that controls the machine 7. Also, two automatic on-off valves 9, 1 constituting the bleeding device
The vacuum pump 1 and the automatic on-off valve 11 for introducing air are controlled by a control unit 13 provided in the absorption refrigerator 7.

FIG. 2 is a diagram showing an operation flow of the air extraction device, and the operation flow of the air extraction device will be described with reference to FIG.
First, the air introduction automatic on-off valve (leak port) 11 is opened, the motor 2 is started, and the vacuum pump 1 is operated (step ST1). Subsequently, it is checked whether or not a predetermined time (for example, 10 minutes) elapses until the vacuum pump 1 warms up (step ST2), and when it elapses, the air introduction automatic on-off valve 11 is closed (step ST3), and the vacuum Make a pull.

Subsequently, when it is confirmed from the output of the vacuum degree confirmation sensor 17 that the degree of vacuum in the bleed pipe 5 between the automatic opening / closing valve 10 and the vacuum pump 1 has reached a predetermined value (step ST4), two pieces are determined. The automatic opening / closing valves 9 and 10 are opened to perform the bleed operation (step ST5). In this case, the automatic opening / closing valve 10 is first opened, the degree of vacuum is checked, and then the automatic opening / closing valve 9 is opened.
May be opened.

FIG. 3 is a diagram showing a stop flow of the extraction device, and the stop flow of the extraction device will be described with reference to FIG.
First, the automatic on-off valves 9 and 10 are closed (step ST1).
1) Wait for a predetermined time (for example, 1 to 10 seconds) until the automatic on-off valves 9 and 10 are completely closed (step ST1).
2) Subsequently, the air introduction automatic on-off valve 11 is opened, the motor 2 is stopped, and the vacuum pump 1 is stopped (step ST1).
3).

During the warm-up of the vacuum pump 1 and when the vacuum pump is stopped, the automatic air opening / closing valve 11 is opened to introduce the atmosphere into the vacuum pump 1.
2 is guided through the filter 12 so that dust and the like in the atmosphere
Therefore, dust and the like do not enter the vacuum pump 1, and the ultimate vacuum degree of the vacuum pump 1 is not reduced and a cause of failure is not caused. Further, since the extraction unit is performed by the control unit 13 of the absorption refrigerator 7, there is no need to separately provide a control unit for controlling the extraction unit, so that the cost of the apparatus is reduced.

FIG. 4 is a diagram showing another configuration of the bleeding device of the absorption refrigerator of the present invention. The difference between the present air extraction device and the air extraction device shown in FIG. 1 is that the automatic on-off valve 10 and the air introduction automatic on-off valve 11 shown in FIG. And a vacuum tank 15 is provided between the three-way valve 14 for automatically opening and closing the air. Then, the filter 12 is connected to one of the three-way valves 14,
A vacuum confirmation sensor 17 is connected to the vacuum tank 15. The output of the vacuum confirmation sensor 17 is output to the control unit 13 of the absorption refrigerator 7.

In the bleeding device of the absorption chiller having the above structure, the control of the motor 2, the automatic opening / closing valve 9, the automatic opening / closing three-way valve 14 for introducing air and the like constituting the bleeding device is performed by the control unit 13 of the absorption chiller 7. Do.

FIG. 5 is a diagram showing an operation flow of the bleeding device. The operation flow of the bleeding device will be described with reference to FIG. First, the vacuum pump 1 and the filter 12 are communicated with the air introduction automatic opening / closing three-way valve 14 not being excited, and the vacuum pump 1 is operated (step ST21). Subsequently, it is confirmed whether or not a predetermined time (for example, 10 minutes) has elapsed until the vacuum pump 1 warms up (step ST2).
2) After the lapse of time, the three-way valve 14 for automatic introduction of air is excited (step ST23), and the vacuum pump 1 and the vacuum tank 15 are communicated to evacuate.

Subsequently, when it is confirmed from the output of the vacuum degree confirmation sensor 17 that the degree of vacuum in the vacuum tank 15 has reached a predetermined value (step ST24), the automatic opening / closing valve 9 is opened to perform the bleeding operation (step ST25). ). As in the case of FIG. 3, the bleeding device is stopped by first closing the automatic opening / closing valve 9 and then for a predetermined time (for example, 1 to 1) until the automatic opening / closing valve 9 is completely closed.
Then, the vacuum pump 1 and the filter 12 are communicated with the air introduction automatic opening / closing three-way valve 14 de-energized, the motor 2 is stopped, and the vacuum pump 1 is stopped.

During the warm-up of the vacuum pump 1 and when the vacuum pump is stopped, an automatic open / close three-way valve 1 for introducing air is provided.
4 is not excited, the vacuum pump 1 and the filter 12 are communicated with each other, and the atmosphere is introduced into the vacuum pump 1.
Since dust and the like in the atmosphere are removed by the filter 12, the dust and the like do not enter the vacuum pump 1 and do not cause a reduction in the ultimate vacuum degree of the vacuum pump 1 or cause a failure. . Further, the control of the bleeding device is performed by the absorption refrigerator 7.
Since the control unit 13 does not need to separately provide a control unit for controlling the extraction device, the cost is reduced.

By providing the vacuum tank 15 in the bleed pipe 5 as described above, the fluctuation of the degree of vacuum in the bleed pipe 5 is absorbed by the vacuum tank 15 and the non-condensable gas in the absorption refrigerator is stably stably absorbed. Can be discharged out of the absorption refrigerator 7.

[0022]

As described above, according to the first aspect of the present invention, two automatic on-off valves are provided in series to form a double shut-off configuration, and air is provided between the automatic on-off valve and the vacuum pump. An automatic opening / closing valve for introduction and a filter are provided, and when the vacuum pump is stopped and / or started, air is introduced into the vacuum pump through the automatic opening / closing valve for air introduction and the filter. No dust or the like is sucked and the ultimate vacuum degree is not reduced or a cause of failure is caused.

According to the invention of claim 2, 2
Since the automatic on-off valve on the side of the air introduction automatic on-off valve and the air introduction automatic on-off valve are integrated into an automatic on-off three-way valve, the number of automatic on-off valves is small. In addition, the configuration of the bleeding device is simplified.

Further, according to the third aspect of the invention,
Since the vacuum tank is provided between the automatic open / close valves or between the automatic open / close valve and the automatic open / close three-way valve, the non-condensable gas in the absorption refrigerator can be stably discharged to the outside of the absorption refrigerator.

According to the fourth aspect of the present invention, since the storage tank for collecting and storing the non-condensable gas in the absorption refrigerator is provided at the connection between the absorption refrigerator and the bleed pipe, the absorption tank is stably absorbed. The non-condensable gas in the refrigerator can be discharged outside the absorption refrigerator.

According to the fifth aspect of the present invention, since the automatic bleeding apparatus is configured to be controlled by the control unit of the refrigerator, the configuration of the control unit is simplified, and the cost of the entire apparatus is reduced. Become.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a bleeding device of an absorption refrigerator of the present invention.

FIG. 2 is a diagram showing an operation flow of the extraction device of the absorption refrigerator shown in FIG.

3 is a diagram showing a stop flow of the bleeding device of the absorption refrigerator shown in FIG.

FIG. 4 is a diagram showing a configuration example of a bleeding device of the absorption refrigerator of the present invention.

5 is a diagram showing an operation flow of the bleeding device of the absorption refrigerator shown in FIG.

FIG. 6 is a diagram showing a configuration example of a conventional bleeding device for an absorption refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum pump 2 Motor 3 Storage tank 5 Bleed pipe 7 Absorption refrigerator 8 Exhaust pipe 9 Automatic open / close valve 10 Automatic open / close valve 11 Automatic open / close valve for air introduction 12 Filter 13 Control part 14 Automatic open / close three-way valve for air introduction 15 Vacuum tank 17 Vacuum confirmation sensor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoji Tanaka 11-1 Asahi-cho, Haneda, Ota-ku, Tokyo Inside Ebara Corporation

Claims (5)

[Claims] 1. An extraction refrigerator for an absorption refrigerator that connects an absorption refrigerator to a vacuum pump with an extraction tube having an automatic opening and closing valve and discharges non-condensable gas in the absorption refrigerator. A double shut-off configuration is provided, and an automatic on-off valve and a filter for introducing air are provided between the automatic on-off valve and the vacuum pump, and the vacuum pump is used for introducing the air when the vacuum pump is stopped and / or started. An absorption chiller configured to introduce air through an automatic opening / closing valve and the filter, wherein a vacuum degree confirmation sensor is provided between the automatic opening / closing valve and a mounting portion of the air introduction automatic opening / closing valve. Bleeding device. 2. An automatic opening / closing three-way valve in which the automatic opening / closing valve on the side of the air introducing automatic opening / closing valve and the air introducing automatic opening / closing valve among the two automatic opening / closing valves are integrated. The bleeding device for an absorption refrigerator according to claim 1. 3. A vacuum tank is provided between the two automatic opening / closing valves or between the automatic opening / closing valve and the automatic opening / closing three-way valve.
3. The bleeding device for an absorption refrigerator according to claim 1, wherein a vacuum degree confirmation sensor is provided in the vacuum tank. 4. The storage tank according to claim 1, wherein a storage tank for collecting and storing non-condensable gas in the absorption refrigerator is provided at a connection portion between the absorption refrigerator and the bleeding pipe. A bleeding device for the absorption refrigerator according to the above. 5. The bleeding device for an absorption chiller according to claim 1, wherein the automatic bleeding device is configured to be controlled by a control unit of the chiller.