JPH07231Y2 - 2-stage deoxidizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a deoxygenation device applied in a water supply line to a cooling / heating device, etc., and more specifically, to a dissolved oxygen concentration of treated water. The present invention relates to improvement of the device for further reduction.

[Prior Art] As is well known, in supplying water to cold heat equipment such as a boiler, a water heater or a cooler, it is necessary to incorporate a deoxidizer for the purpose of preventing corrosion of these equipment. In this deoxidizer, a deoxidizer module is connected in the water supply line to the equipment used, and raw water (tap water, well water, other industrial water, etc.) is passed through the deoxidizer module, and this water passing process is performed. In the above, the inside of the deoxidizing module is evacuated to remove the dissolved gas in the raw water by degassing.

Conventionally, in such a deoxidizing apparatus, a water-sealed vacuum pump, which has a simple structure and is inexpensive, is often used as a means for vacuuming. This water-sealed vacuum pump, for example, puts an appropriate amount of sealing water in a casing equipped with a substantially circular pump chamber, and rotates the impeller slightly eccentric from the center of the casing to apply centrifugal force to the casing. Is a device that flows along the inner wall of the casing, creates a substantially circular space in the central portion of the casing, and performs suction and discharge by displacement of the space due to rotation of the impeller.

By the way, as shown in FIG.
Deoxygenation module 34 and flow switch 35 connected in a water supply line 33 between a raw water source 31 and a treated water distributor 32.
And a solenoid valve 38 for sealing water provided in the sealing water supply line 37 between the water supply line 33 and the water sealing vacuum pump 36, and the vacuum degassing between the deoxidizing module 34 and the water sealing vacuum pump 36. Qi line 39
An electromagnetic valve 40 is provided therein for holding vacuum at the time of stop. Therefore, when raw water is supplied from the raw water supply source 31 to the water supply line 33, the flow switch 35 operates to drive the water-sealed vacuum pump 36, and at the same time, the solenoid valves 38, 4 are connected.
Open 0 to evacuate the inside of the deoxidizing module 34 by vacuum. When the supply of raw water is stopped, the water-sealed vacuum pump 36 is stopped and both the solenoid valves 38, 40 are closed.

[Problems to be Solved by the Invention] However, the conventional deoxidizer has the following problems. That is, the dissolved oxygen concentration of the treated water by the conventional deoxygenation apparatus, the outer pressure of the hollow fiber membrane in the deoxygenation module 34 is 10torr, the oxygen concentration in the raw water is about 8p
It is possible to reduce pm (normal concentration at atmospheric temperature) to 0.5 ppm, but in order to reduce this to a dissolved oxygen concentration of 0.1 ppm or less, about 8 ppm of dissolved oxygen in raw water is sucked in under a vacuum of 1 torr. Therefore, the capacity of the water-sealed vacuum pump in the conventional deoxidizer is required to be about 10 times larger. Therefore, in reality, such a large-capacity water-sealed vacuum pump is not desirable, and it was almost impossible to reduce the dissolved oxygen concentration to 0.1 ppm or less.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and includes a first-stage deoxidizing module in a water supply line between a raw water supply source and a treated water distribution unit. A two-stage deoxidizing module is connected in series, and a one-stage water-sealed vacuum pump is connected to the one-stage deoxidizing module via a one-stage vacuum degassing line. A second-stage water-sealed vacuum pump was connected to the second-stage water-sealed vacuum pump through a second-stage vacuum degassing line, and the discharge passage of the second-stage water-sealed vacuum pump was connected to the first-stage side vacuum degassing line. It has a feature.

[Operation] According to the present invention, the raw water passes through the first-stage deoxidizing module and the second-stage deoxidizing module in the water supply line in order to reach the treated water supply unit. The first-stage water-sealed vacuum pump evacuates the first-stage deoxidizing module to degas most of the dissolved oxygen in the raw water passing through the first-stage deoxidizing module. Similarly, the second-stage water-sealed vacuum pump also evacuates the interior of the second-stage deoxygenation module to further degas the dissolved oxygen in the raw water passing through the second-stage deoxidation module. The exhaust gas that has been deaerated and removed by the second-stage water-sealed vacuum pump flows into the first-stage vacuum degassing line from the discharge passage of the second-stage water-sealed vacuum pump, and again by the first-stage water-sealed vacuum pump. Under the action of the vacuum pump, it is discharged into the atmosphere from the first-stage side discharge passage of the first-stage side water-sealed vacuum pump.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 showing an embodiment of this invention is shown in FIG.
It is explanatory drawing which shows arrangement | positioning of each apparatus of a step type deoxidizer.

The two-stage deoxidizer shown in FIG. 1 has a pressure reducing valve 9, a first-stage deoxidizer module 4, a flow from the upstream side in a water supply line 3 between a raw water supply source 1 and a treated water distribution unit 2. The switch 10 and the two-stage deoxidizing module 6 are sequentially connected in series.

The pressure reducing valve 9 in this configuration prevents the supply water pressure above a certain level from being applied to the first-stage deoxidizing module 4 and the second-stage deoxidizing module 6, and prevents damage to both deoxidizing modules 4 and 6. I am trying to

The both deoxygenation modules 4 and 6 include, for example, a large number of hollow fiber membranes, the raw water is passed through the inside of the hollow fiber membranes, the outside is evacuated to a vacuum, and the raw water passes through the hollow fiber membranes. A hollow fiber membrane oxygen module configured to remove dissolved oxygen in raw water.

The flow switch 10 is connected to the outlet side of the first-stage deoxidizing module 4 in the water supply line 3, and the water that has passed through the first-stage deoxidizing module 4 from the water supply line 3 is discharged. Is detected and an electric signal is output.

Now, in the present invention, the both deoxidizing modules 4, 6
A water-sealed vacuum pump is used as a means for vacuum degassing.

First, the first-stage deoxidizing module 4 will be described. The first-stage deoxidizing module 4 is connected to a first-stage water-sealing vacuum pump 5 through a first-stage vacuum deaeration line 12 in a flow path. ing. The first-stage water-sealed vacuum pump 5 has a capacity of 1 for the water supply line 3 in order to introduce the sealed water.
Flow paths are connected via a stage side sealed water supply line 11. The first-stage water-sealed vacuum pump 5 is electrically connected to the flow switch 10,
It is designed to operate in response to 10 output signals.

The first-stage sealed water supply line 11 is provided with a first-stage constant flow valve 13 and a first electromagnetic valve 14. A second solenoid valve 15 is provided in the first-stage vacuum deaeration line 12 and is electrically connected to the flow switch 10 together with the first solenoid valve 14. Therefore, when the flow switch 10 detects the flow of water, the valve opening operation is performed in response to the detection signal.

Next, the second-stage deoxygenation module 6 will be described. The second-stage deoxygenation module 6 is connected to a second-stage water-sealed vacuum pump 7 via a second-stage vacuum deaeration line 17 in a flow path. Has been done. The second-stage side water-sealed vacuum pump 7 has the first-stage side water-sealed supply line 11 for introducing the sealed water.
A flow path is connected via a two-stage side sealed water supply line 16 branched from. In addition, this second-stage water-sealed vacuum pump 7
It is electrically connected to the flow switch 10 and operates in response to an output signal of the flow switch 10.

A second-stage constant flow valve 18 and a third solenoid valve 19 are provided on the second-stage sealing water supply line 16. Further, the second-stage vacuum deaeration line 17 is provided with a fourth solenoid valve 20 and is electrically connected to the flow switch 10 together with the third solenoid valve 19. Therefore, when the flow switch 10 detects the flow of water, the valve opening operation is performed in response to the detection signal.

Further, in the present invention, the discharge passage 8 of the second-stage water-sealed vacuum pump 7 is connected to the first-stage vacuum deaeration line 12 of the first-stage water-sealed vacuum pump 5 in communication.
Along with the exhaust of the first-stage water-sealed vacuum pump 5,
It is discharged into the atmosphere through the step-side discharge passage 21. That is,
Since the discharge passage 8 is connected to the suction passage of the first-stage side water-sealed vacuum pump 5, the exhaust gas that has been degassed in vacuum in the second-stage side water-sealed vacuum pump 7 is once again discharged to the above-mentioned 1
After receiving the vacuum pump action of the stage side water seal type vacuum pump 5,
Emitted into the atmosphere.

In the above structure, the capacity of the second-stage water-sealed vacuum pump 7 is the same as the capacity of the first-stage water-sealed vacuum pump 5.

As described above, in the above configuration, the dissolved oxygen concentration of the raw water is about 8 p
Even if the outer side atmospheric pressure of the hollow fiber membrane in the second-stage deoxygenation module 6 is set to 1 torr or less, which is one-tenth of that in the first-stage deoxidation module 4, it will be degassed from pm to about 0.5 ppm. The volume sucked by the second-stage water-sealed vacuum pump 7 is approximately the same as the volume sucked by the first-stage water-sealed vacuum pump 5. As a result, the second-stage water-sealed vacuum pump 7
Does not require an extra large capacity water-sealed vacuum pump, but may have the same capacity as that of the first-stage side water-sealed vacuum pump 5. Further, if the exhaust of the second-stage water-sealed vacuum pump 7 is directly discharged into the atmosphere, the pressure ratio becomes excessive (about 1000 times), so that the first-stage water-sealed vacuum pump 5 in the first-stage It is more advantageous to discharge to the side vacuum degassing line 12. Therefore, the treatment amount of the first-stage water-sealed vacuum pump 5 increases by about 5%, but it is not a problem because it is within the treatable range.

Next, the operation and action of the two-stage deoxidizer according to the above embodiment will be described.

When the raw water that has passed through the pressure reducing valve 9, the water supply line 3 and the first-stage deoxidizing module 4 from the raw water supply source 1 flows through the flow switch 10, the flow switch 10 detects this and outputs a running water detection signal. In response to the detection signal, the first solenoid valve to the fourth solenoid valve 14, 15, 19, 20 each perform a valve opening operation, and the first-stage side water-sealed vacuum pump 5 and the second-stage side water-sealed type. The vacuum pumps 7 are driven respectively.

The first-stage deoxygenation module 4 is evacuated by the first-stage water-sealed vacuum pump 5 through the first-stage vacuum deaeration line 12. The exhausted air that has been evacuated and the drainage of the sealing water from the pump are discharged from the first-stage discharge path 21.

Since the second-stage deoxygenation module 6 is connected in series with the first-stage deoxidation module 4 via the water supply line 3, the second-stage deoxidation module 6 is degassed by the first-stage deoxidation module 4 to dissolve dissolved oxygen. Receiving water that has been treated to a concentration of approximately 0.5 ppm, degassing this water in a further high vacuum (1 torr or less) to make treated water with a dissolved oxygen concentration of approximately 0.1 ppm or less. Supply to part 2. The second-stage deoxygenation module 6 is evacuated as described above by the second-stage water-sealed vacuum pump 7 through the second-stage vacuum deaeration line 17. The exhausted air that has been evacuated and the drainage of the sealing water from the inside of the pump are discharged through the discharge passage 8 to the first-stage vacuum deaeration line 12
From the above into the first-stage side water-sealed vacuum pump 5, where it is once again subjected to the vacuum pump action and discharged from the first-stage side discharge passage 21.

[Effects of the Invention] As described above, according to the present invention, a water-sealed vacuum pump that connects the first-stage deoxidizing module and the second-stage deoxidizing module in series and evacuates both deoxidizing modules is provided. Since they are connected to each other and the discharge passage of the second-stage water-sealed vacuum pump is connected to the suction passage of the first-stage water-sealed vacuum pump, the dissolved oxygen concentration of the raw water can be adjusted to the normal concentration at atmospheric temperature. 0.5ppm in the first stage deoxidizing module from a certain initial 8ppm
Then, further deaeration with the second stage deoxidation module,
The dissolved oxygen concentration can be set to 0.1 ppm or less.

Further, the capacity of the both water-sealed vacuum pumps may be the same as the capacity of the conventional water-sealed vacuum pump, so that only two water-sealed vacuum pumps are required, and there is no need for a special large-capacity water-sealed vacuum pump. .

And, because it is possible to obtain treated water with a dissolved oxygen concentration of 0.1 ppm or less, it is possible to enhance the corrosion prevention effect of cooling and heating equipment that uses water, and to replace CFC, which is a problem with air pollution. As a result, it can also be used as cleaning water for ultra-precision products (for example, semiconductors).

Furthermore, since the dissolved oxygen concentration can be lowered with a simple structure, it is very effective as a deoxidizer of this kind.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the arrangement of each device of a two-stage deoxidizing device showing one embodiment of the present invention, and FIG. 2 is an explanatory view showing the arrangement of each device of a conventional deoxidizing device. 1 ... Raw water supply source 2 ... Treated water supply / distributor 3 ... Water supply line 4 ... First stage deoxidizing module 5 ... First stage water-sealed vacuum pump 6 ... Second stage deoxidizing module 7 ... Second stage water sealing Vacuum pump 8 ... Discharge passage 9 ... Pressure reducing valve 10 ... Flow switch 11 ... First stage side sealed water supply line 12 ... First stage side vacuum deaeration line 13 ... First stage constant flow valve 14 ... First solenoid valve 15 ... Second Solenoid valve 16 ... Second-stage side sealed water supply line 17 ... Second-stage side vacuum deaeration line 18 ... Second-stage side constant flow valve 19 ... Third solenoid valve 20 ... Fourth solenoid valve 21 ... First-stage side discharge passage

Claims (1)

[Scope of utility model registration request] 1. A first-stage deoxidizing module 4 and a second-stage deoxidizing module 6 are connected in series in a water supply line 3 between a raw water supply source 1 and a treated water distributor 2. The first-stage water-sealed vacuum pump 5 is connected to the stage-side deoxidation module 4 via the first-stage vacuum deaeration line 12, and the second-stage deoxidation module 6 is connected to the second-stage vacuum deaeration line 17. Two-stage side water-sealing vacuum pump 7 is connected, and the discharge passage 8 of the second-stage side water-sealing vacuum pump 7 is connected to the first-stage side vacuum degassing line 12. Deoxidizer.