JPH10111019A - Air-extraction device in negative pressure pipeline and method of air extraction employing the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air extraction device of a negative pressure pipeline without stopping the operation of the same and a method for air extraction employing the device. SOLUTION: A negative pressure pipeline, generating a negative pressure in the suction side of a circulation pump 5 since the circulation pump 5 is in a low pressure level side K, is provided with a transparent small vessel 6, connected to a route communicated with the negative pressure site of the pipeline, and a second valve V2, connected to the upper part of the small vassel 6 to extract air. When a predetermined amount of air is detected in the small vessel 6 visually, a first valve V1 is closed and the second valve V2 is opened to discharge a part of the air and, thereafter, remaining air is discharged by filling the small vessel 6 through priming water, then, the first valve V1 is opened after closing the second valve V2 whereby the air in the negative pressure pipeline can be purged correctly without stopping the operation of the circulation pump 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air bleeding device for a negative pressure pipe and a method of bleeding air using the device, for example, in a system having a circulation path such as a cogeneration system using exhaust gas. The present invention relates to an air bleeding device for a negative pressure pipe capable of bleeding air generated in a negative pressure pipe in a path without stopping operation of a system device, and an air bleeding method using the device.

[0002]

2. Description of the Related Art For example, in a conventional hot water supply system for generating hot water using exhaust gas of an internal combustion engine as a cogeneration system device as shown in FIG. Since this occurs, description will be made from this configuration. In the figure, 1 is an AC generator, 2
Is an internal combustion engine such as a gas engine for driving the AC generator 1. Reference numeral 2A denotes an exhaust gas utilization type heat exchanger (hereinafter, referred to as an exhaust gas heat exchanger) that heats circulating water to warm water using heat contained in exhaust gas of the internal combustion engine 2. 2b is an exhaust pipe for exhaust gas. The exhaust gas heat exchanger 2A is disposed in the circulation path J of the circulating water from the hot water storage tank 3, and in this circulation path J, as shown in the figure, a part of the path is provided for convenience of installation equipment layout. In some cases, a first arch-shaped (gate-shaped) path composed of the high level H ₁ and the low level K ₁ may be formed, and the exhaust gas heat exchanger 2A is in the path J just above the high level H _1. It is arranged in the part. Reference numeral 4 denotes a hot water boiler provided as necessary. In the case of the hot water boiler 4 as well, a high level H ₂ and a low level H ₂ are provided as a second arched path following the first arched path in the circulation path J. It is positioned higher level of H ₂ pathway consisting of level K _2. In addition, 5 is a circulation pump, and V is a valve for venting air. With the above configuration, the hot water heated by the exhaust gas of the internal combustion engine 2 is supplementarily heated by the hot water boiler 4 so as to become hot water of a predetermined temperature, and then supplied to the hot water storage tank 3 by the circulation pump 5. . The hot water in the hot water storage tank 3 is used for hot water supply. By the way, in such a circulation route J, there is a loosening of a screw at a pipe connection part, and outside air is mixed in a part of the hot water storage tank 3 and the like, and air gradually accumulates in the pipe during operation of the system. It is necessary to periodically pull out the work. In this case, when the system device in which the circulation pump 5 is stopped is inactive, the air in the pipe can be easily vented as follows. That is, in such a case, when the air bleeding valve V is opened, the water pressure P1 is applied to the valve V due to the head drop of the hot water storage tank 3.
Since the water is easily discharged from the valve V by 1 and the hot water subsequently blows out, it is only necessary to close the valve V after confirming the release of air from inside the pipe.

[0003]

In the conventional hot water supply system, the suction side A of the circulation pump 5 is a so-called negative pressure pipe in which the pressure in the pipe is lower than that of the outside air. During the operation of the circulation pump 5, the air is evacuated by the valve V provided on the output side path.
It was difficult for the following reasons. Is because, in thus constructed hot water circulation path J, the circulation pump 5 is operated, during operation of the hot water supply system unit hot water boiler 4 is also operated, the hot water boiler 4, for example, 1 kg / cm ² The circulation pump 5 is connected to the hot water boiler 4 so as not to apply the above pressure.
2 is at a lower level (downstream side), the path A in FIG.
This is because, even if the air is ventilated by opening the air, there is a disadvantage that the air enters the pipes due to the negative pressure in the pipes of the circulation path J communicating with the valve V. This, hot water boilers 4 is omitted from the circulation path J, the site H ₁ close to the exhaust gas heat exchanger 2A is provided a valve V, resulting in similar problems even when performing air removal. The present invention solves the above-mentioned problems (problems) of the prior art, and an air bleeding device in a negative pressure pipe which enables smooth air bleeding even during operation of a system device, and an air bleeding device using the device. It is intended to provide a punching method.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an air bleeding device for a negative pressure pipe according to the present invention provides a high-pressure pipe in a circulation path for supplying a liquid such as hot water using a pipe.
Since there is a lower level and the circulation pump is on the lower level side, in a negative pressure pipe that generates a negative pressure on the suction side of the circulation pump, it is connected to a path communicating with the negative pressure portion of this pipe. A first valve for bleeding air,
And a second valve for air release connected above the small container. In addition, the air bleeding method using the air bleeding device, when a predetermined amount of air is visually detected in the small container during the operation of the circulation pump, while the operation of the circulation pump is continued, first, After closing the first valve and then opening the second valve to release a part of the air, the priming water is injected into the small container via the second valve and the small The remaining air may be released by filling the inside of the container with water, and then, after closing the second valve, the first valve may be opened.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG. 1, the same components as those in the conventional example are denoted by the same reference numerals as those in FIG. 2, and the description thereof is omitted. In FIG. 1, as in the conventional example, an arch-shaped path generated due to the layout of the device
And K are the high and low levels in circulation path J, respectively. In the present invention, the first valve V1 for bleeding air is connected to a desired portion B for bleeding air, which is a negative pressure pipe, and the second valve V2 for bleeding air is moved up and down with the transparent small container 6 interposed therebetween. It is characterized in that it is arranged in series in the direction, and the height of the second valve V2 above is
Is disposed at a position lower than the highest liquid level L. First, the air bleeding performed before the operation of the circulation pump 5 is started will be described. In this case, water is applied to the path from the part P to the part Q in the circulation path J by the head pressure of L of the hot water tank 3, and the level of water in the pipe of the part Q in this case is the level L of the hot water tank 3. Becomes the same level L ′. In this state, the first and second valves V1 and V
2 are opened together, the air in the pipe is released, priming water is injected from the receiving port R, the water is filled in the small container 6, and then the second valve V2 for air release is closed. The air bleeding operation inside the pipe is completed. Next, if the operation of the circulation pump 5 is started in a state where the first valve V1 for air release is opened and the second valve V2 for air release is closed, no air is present inside the pipe. Normal operation becomes possible.

Next, a description will be given of the air bleeding operation of the negative pressure pipe in the circulation path J when the circulation pump 5 is operated and the hot water supply system is operated. Hot water supply system device of the present invention (hereinafter simply referred to as system device)
In this case, since the circulation pump 5 is installed on the lower level side (downstream side) behind the internal combustion engine 2, the circulation path J
The part K on the suction side of the pump circulation 5 (the part B is also the part K
The fluid pressure in the piping is a negative pressure lower than the external pressure. Therefore, if the small container 6 and the second valve V2 are not present, and if the air generated in the circulation path J is evacuated only by the first valve V1, the outside air flows backward as in the case of the conventional example. Since the air enters the piping, air does not escape due to the opening operation of the first valve V1 during operation of the system device. However, in the case of the present invention, as described above, in addition to the first valve V1, the second valve V2
And the transparent small container 6, the air existing in the negative pressure pipe can be smoothly removed by the following operation. That is, during the operation of the system device in which the circulation pump 5 is operating, outside air enters the circulation path J due to loosening of screws at the connection portions and the like in the circulation path J as described above. Outside air (air) gathers in the small container 6 in the process of circulating hot water through the circulation path J,
The air increases, and the water in the small container 6 is gradually pushed down by the pressure of the air. By the way, since the small container 6 is made transparent, if the small container 6 is monitored, the situation where the air increases can be visually detected. Therefore, when it is detected visually that the air in the small container 6 has increased to a predetermined amount and the level of the liquid level has reached, for example, the level of L2, first, the first valve V1 is closed. If the second valve V2 is opened, the small container 6 can be opened.
Since the air inside was compressed and confined, most of the air was smoothly discharged to the outside. However, since a part of the air remains, next, if priming water is injected from the receiving port R above the second valve V2 to fill the inside of the small container 6 with water, the remaining air is completely discharged. be able to. Therefore, after confirming that the air in the small container 6 has run out, the second valve V2 may be closed, and then the first valve V1 may be opened.

[0007] The present invention is not limited to the above embodiment. For example, in the embodiment shown in FIG. 1, the exhaust gas heat exchanger 2A disposed immediately before the circulation pump 5
The low-level part downstream of is a negative pressure pipe, and the case where air is evacuated has been described. However, the hot water boiler 4 is disposed between the exhaust gas heat exchanger 2A and the circulation pump 5 as shown in FIG. In this case, the downstream portion of the hot water boiler 4 is also a portion of the negative pressure pipe, so that the air is formed by combining the first and second valves V1 and V2 for bleeding air and the small container. What is necessary is just to arrange | position a bleeding apparatus according to the structure of FIG. 1, and to bleed air. Further, in the above-described embodiment, the case of bleeding air from the negative pressure pipe in the hot water supply system using the exhaust gas of the internal combustion engine 2 has been described. However, the present invention is not limited to the embodiment. It is also applicable to the air bleeding of the negative pressure pipe for the above application.

[0008]

According to the present invention, as described above, an air bleeding device comprising a combination of the first and second valves for bleeding air and a transparent small container is constituted, and an air bleeding method using this device is performed. Therefore, it has the following excellent effects. By collecting the air mixed in the pipes in the circulation path in a small container, even during the operation of the system device, only a predetermined operation such as closing the first valve and opening the second valve can be used to perform the negative pressure piping. The air that has accumulated inside can be properly removed. In this case, since a transparent container is used as the small container, if this small container is constantly monitored, it is possible to accurately confirm the time at which the air should be vented without missing any time.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a schematic configuration of an air bleeding device in a negative pressure pipe in which the present invention is applied to a hot water supply system using exhaust gas according to an embodiment of the present invention.

FIG. 2 is a system diagram showing a schematic configuration of an air bleeding device for a negative pressure pipe in a conventional hot water supply system using exhaust gas.

[Explanation of symbols]

 1: Alternator 2: Internal combustion engine 2A: Exhaust gas heat exchanger 3: Hot water tank 5: Circulation pump 6: Transparent small container V1: First valve for air release V2: Second valve for air release Valve J: Circulation path H: High level K: Low level

Claims (2)

[Claims] 1. A high-low level is provided in a circulation path for supplying a liquid such as hot water using a pipe, and a circulation pump is provided on a low level side, so that a negative pressure is applied to a suction side of the circulation pump. In a negative pressure pipe as described above, a first valve for air release connected to a path communicating with a negative pressure portion of the pipe, a transparent small container connected above the first valve, An air bleeding device for negative pressure piping, comprising: a second valve for bleeding air connected above the small container. 2. The air bleeding device for a negative pressure pipe according to claim 1, wherein the operation of the circulation pump is continued when a predetermined amount of air is visually detected in the small container during the operation of the circulation pump. First, the first valve is closed, and then the second valve is opened to release a part of the air. Then, the priming water is introduced into the small container via the second valve. A negative pressure pipe characterized in that the remaining air is released by injecting and filling the inside of the small container with water, and then closing the second valve and then opening the first valve. Air removal method.