JP4280356B2 - Deaerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deaeration device having a throttle means.
[0002]
[Prior art]
As shown in Japanese Patent Laid-Open No. 7-328316, a conventional deaeration device connects a throttling means through a filter to a liquid tank containing a liquid, and a suction port of a liquid feed pump is connected to the throttling means, An upper open type gas-liquid separation tank for separating liquid and gas is connected to the discharge port of the liquid feed pump.
[0003]
Then, the liquid is depressurized between the throttling means and the liquid feed pump by the operation of the liquid feed pump, and the dissolved gas in the liquid is deposited as bubbles from the liquid. Since these bubbles are coarsened by expansion and coupling while passing through the liquid feed pump, they are quickly levitated and separated after being sent to the gas-liquid separation tank.
[0004]
[Problems to be solved by the invention]
In this conventional apparatus, a liquid feed pump is located between the throttle means and the gas-liquid separation tank, and bubbles generated by the throttle means pass through the liquid feed pump. There is a problem that the effect is also reduced.
[0005]
Furthermore, there is a problem that a liquid feed pump that is easily affected by cavitation caused by air bubbles passing through is required to have cavitation resistance.
[0006]
The present invention has been made in view of these points, and an object of the present invention is to solve the problem of reduction in pump suction capability and cavitation in a decompression type deaeration device.
[0007]
[Means for Solving the Problems]
The present invention includes a liquid tank containing a liquid, a throttle means connected to the liquid tank, a sealed gas-liquid separation tank connected to the throttle means for separating and storing the liquid and gas, and the gas A liquid circulation pump in which a suction port is connected to the liquid reservoir of the liquid separation tank and a discharge port is connected to the liquid tank, and a liquid suction in which the liquid circulation pump directly sucks the liquid in the liquid tank without going through the gas-liquid separation tank Liquid supply line, a liquid supply pipe for supplying the liquid discharged from the liquid circulation pump to the gas-liquid separation tank, and a liquid supplied to the gas-liquid separation tank from the upper end of the gas-liquid separation tank. It is a deaeration device provided with a conduit for returning liquid into the tank.
[0008]
And since the suction decompression force of the liquid circulation pump acts on the throttle means via the sealed gas-liquid separation tank, the bubbles of dissolved gas precipitated from the liquid between the throttle means and the gas-liquid separation tank are After entering the gas-liquid separation tank, it is separated and released into the upper negative pressure space with respect to the lower liquid reservoir, and does not reach the liquid circulation pump. For this reason, the problem of the fall of the pump suction capability and the cavitation which arise when the bubble deposited from the liquid passes a pump does not arise. Further, when a large amount of gas accumulates in the gas-liquid separation tank, the above-mentioned pipelines are made to function, and a liquid circulation pump common to that used for deaeration is used, and a liquid suction pipe and a liquid supply pipe are used. The liquid in the liquid tank is discharged and supplied to the gas-liquid separation tank by the channel, thereby raising the liquid level in the gas-liquid separation tank, and discharging the liquid into the liquid tank through the liquid return conduit Thus, the gas accumulated in the gas-liquid separation tank is exhausted so as to be pushed out.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to an embodiment shown in FIG.
[0010]
11 is a liquid tank containing a liquid to be degassed. A throttle valve 14 as a throttle means is connected to the lower part of the liquid tank 11 via an on-off valve 12 and an electromagnetic three-way switching valve 13. The throttle valve 14 is a variable throttle, but a fixed orifice may be used as the throttle means.
[0011]
The pipe line 15 having the throttle valve 14 is connected to a lower part of a sealed gas-liquid separation tank 16 that separates and stores liquid and gas.
[0012]
The gas-liquid separation tank 16 includes a liquid level sensor 17 for managing the liquid level of the liquid L accommodated in a liquid reservoir 16a located in a relatively lower part of the tank, and a relatively upper part of the tank. And a vacuum gauge 18 for measuring the pressure in the negative pressure space 16b.
[0013]
A pipe 21 is drawn out from the liquid reservoir 16a of the gas-liquid separation tank 16, and a suction port 23a of the liquid circulation pump 23 is connected through an electromagnetic on-off valve 22 in the pipe 21. As this liquid circulation pump 23, for example, a vortex pump is used.
[0014]
The discharge port 23b of the liquid circulation pump 23 is connected to the upper portion of the liquid tank 11 via a check valve 24, an electromagnetic three-way switching valve 25, a pipe line 26 and an on-off valve 27.
[0015]
Between the electromagnetic three-way switching valve 13 and the suction port 23a of the liquid circulation pump 23, the liquid circulation pump 23 directly sucks the liquid in the liquid tank 11 without passing through the gas-liquid separation tank 16. A suction conduit 31 is provided.
[0016]
Further, a liquid supply line 32 for supplying the liquid discharged from the liquid circulation pump 23 to the gas-liquid separation tank 16 is disposed between the electromagnetic three-way switching valve 25 and the line 21. ing.
[0017]
In addition, between the upper end of the gas-liquid separation tank 16 and the pipe line 26, the liquid supplied into the gas-liquid separation tank 16 is returned from the upper end of the gas-liquid separation tank 16 into the liquid tank 11. A liquid return conduit 33 is provided, and an electromagnetic on-off valve 34 is provided in the conduit 33.
[0018]
In FIG. 1, the two electromagnetic three-way switching valves 13 and 25 indicate that the white triangle mark side indicates an open state, the black triangle mark side indicates a closed state, and two electromagnetic open / close states. In the valves 22 and 34, the white mark represents the pipe line communication state, and the black mark represents the pipe line closed state.
[0019]
Next, the operation of the illustrated embodiment will be described.
[0020]
First, as shown in FIG. 1, the valve state during the deaeration operation is such that the suction port 23a of the liquid circulation pump 23 is an electromagnetic on-off valve 22, the liquid reservoir 16a of the gas-liquid separation tank 16, the throttle valve 14 The discharge port 23b of the liquid circulation pump 23 is connected to the lower part of the liquid tank 11 through the electromagnetic three-way switching valve 13 and the on-off valve 12, and the check port 24, the electromagnetic three-way switching valve 25, the pipeline 26 Further, it communicates with the upper part of the liquid tank 11 via the on-off valve 27. At this time, the liquid return conduit 33 is closed by the electromagnetic on-off valve 34.
[0021]
Thus, during the deaeration operation, the suction pressure reduction force of the liquid circulation pump 23 acts on the throttle valve 14 via the electromagnetic on-off valve 22 and the sealed gas-liquid separation tank 16, and therefore the throttle valve 14 and the gas Dissolved gas is precipitated as bubbles from the liquid between the liquid separation tank 16 and the liquid separation tank 16. That is, it is degassed.
[0022]
The dissolved gas bubbles enter the gas-liquid separation tank 16 and are separated and released into the upper negative pressure space 16b with respect to the lower liquid reservoir 16a, and do not reach the liquid circulation pump 23. For this reason, the problem of the fall of the pump suction capability and the cavitation which arise when the bubble deposited from the liquid passes a pump does not arise.
[0023]
On the other hand, as the gas accumulates in the gas-liquid separation tank 16, the liquid level drops, and when the liquid level sensor 17 is activated at the lower limit of the liquid level due to a large amount of gas accumulation, the two electromagnetic three-way directions are generated by the sensor signal. The direction of the switching valves 13 and 25 is automatically switched, and at the same time, the electromagnetic on-off valve 22 is automatically switched to the closed line state, and the electromagnetic on-off valve 34 is automatically switched to the pipe line communicating state.
[0024]
That is, the suction port 23a of the liquid circulation pump 23 communicates with the lower part of the liquid tank 11 via the liquid suction pipe 31, the electromagnetic three-way switching valve 13 and the on-off valve 12, and the liquid circulation pump 23 discharges. The outlet 23b communicates with the lower portion of the gas-liquid separation tank 16 via a check valve 24, an electromagnetic three-way switching valve 25, and a liquid supply conduit 32.
[0025]
Further, the upper end portion of the gas-liquid separation tank 16 communicates with the upper part of the liquid tank 11 via the liquid return pipe 33 and the on-off valve 27 having the electromagnetic on-off valve 34 switched to the pipe communication state.
[0026]
Accordingly, the liquid in the liquid tank 11 is discharged and supplied to the gas-liquid separation tank 16 through the liquid suction pipe 31 and the liquid supply pipe 32 using the liquid circulation pump 23 common to the degassing. As a result, the liquid level in the gas-liquid separation tank 16 is raised, and the liquid is discharged into the liquid tank 11 through the conduit 33 for returning the liquid to the negative pressure space 16b of the gas-liquid separation tank 16. The accumulated gas is exhausted to extrude, and the sealed gas-liquid separation tank 16 is returned to the initial operation state.
[0027]
The liquid L is, for example, a cleaning liquid when the liquid tank 11 is an ultrasonic cleaning tank, but is not limited thereto, and may be, for example, a liquid that needs to reduce dissolved oxygen or the like.
[0028]
【The invention's effect】
According to the present invention, the suction pressure reduction force of the liquid circulation pump acts on the throttle means via the sealed gas-liquid separation tank, so the dissolved gas precipitated from the liquid between the throttle means and the gas-liquid separation tank After the gas bubble enters the gas-liquid separation tank, it is separated and released into the upper negative pressure space with respect to the lower liquid reservoir, and does not reach the liquid circulation pump. In addition, it is possible to solve the problem of cavitation and cavitation, and it is possible to use an existing liquid circulation pump that does not require a high degree of cavitation resistance as well as providing a superior degassing effect due to its powerful pump suction capability. Furthermore, when a large amount of gas accumulates in the gas-liquid separation tank, the liquid suction line, the liquid supply line, and the liquid return line are made to function, and the same liquid circulation as that during degassing Using a pump, the liquid in the liquid tank is discharged and supplied to the gas-liquid separation tank to raise the liquid level in the gas-liquid separation tank, and to return the liquid so that the gas accumulated in the gas-liquid separation tank is pushed out. It is possible to exhaust the gas through the pipe line, and the sealed gas-liquid separation tank can be easily returned to the initial operation state.
[Brief description of the drawings]
FIG. 1 is a piping diagram showing an embodiment of a deaeration device according to the present invention.
[Explanation of symbols]
11 Liquid tank
14 Throttle valve as throttling means
16 Gas-liquid separation tank
23 Liquid circulation pump
23a Suction port
23b Discharge port
31 Pipeline for liquid suction
32 Pipeline for liquid supply
33 Liquid return line

Claims (1)

A liquid tank containing a liquid;
Throttle means connected to the liquid tank;
A sealed gas-liquid separation tank connected to the throttling means and separating and storing liquid and gas; and
A liquid circulation pump having a suction port connected to the liquid reservoir of the gas-liquid separation tank and a discharge port connected to the liquid tank;
A liquid circulation pump for directly sucking the liquid in the liquid tank without going through the gas-liquid separation tank;
A liquid supply conduit for supplying the liquid discharged from the liquid circulation pump to the gas-liquid separation tank;
Degasser you characterized by comprising a pipe for gas-liquid supplied to the separation tank liquid from the upper end of the gas-liquid separation tank back liquid back into the liquid tank passage.

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