JPH09299709A - Deaerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform continuous water supply while using a vacuum treating vessel by combining plural water storage chambers for temporarily storing water which has been deaerated in a main deaeration chamber, alternately introducing water from the main deaeration chamber to the water storage chamber and alternately taking out it. SOLUTION: A cylindrical body 1 is coaxially divided by an annular partition 5 to form a cylindrical main deaeration chamber 2 in the central part. The annular spaces around the chamber 2 are each divided in two by partitions in the radial direction to form a first and a second water storage chamber 3, 4. The main deaeration chamber 2 is evacuated to below atmospheric pressure to suck water from a water supply pipe 8, and dissolved gas in the water is collected to deaerate the water by vacuum boiling. After the deaerated water overflows into a storage chamber 10, it is sucked into the first water storage chamber 3 by a solenoid valve 29 of a control means, and when it reaches the upper water level limit, the solenoid valve 29 is switched by a signal from a water level detector 31 to make it communicate with fresh air. When a water transfer pump 22 is started, the deaerated water is sent to a pressurized water tank 23 to undergo water distribution. At the same time, the second water storage chamber 4 is evacuated by a solenoid valve 30 to suck the deaerated water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment device for water supply and distribution facilities such as buildings and factories, and more particularly to a degassing device for removing dissolved gas in water while maintaining a continuous water supply function. is there.

[0002]

2. Description of the Related Art Water treatment methods for degassing dissolved gas in water are roughly classified into a chemical injection method, an ion exchange method, and a vacuum deaeration method. The chemical injection method is known to mix a deoxidizing agent such as hydrazine, which is highly toxic, with boiler boiler cans and pipe protective agents to prevent scale generation, and in the ion exchange method, red rust is mainly used. As a countermeasure, membrane degassing of dissolved oxygen is performed under reduced pressure. Furthermore, in the vacuum degassing method, oxygen and carbon dioxide gas dissolved in water
A simple method is generally known, in which free chlorine and other substances are collectively degassed in a high-vacuum container at a fixed amount of water, and in special cases, a multistage continuous vacuum degassing method that combines an ejector and a cyclone. Is also known.

Besides this, for example, Japanese Patent Publication No. 2-11
No. 319, Japanese Patent Publication No. 2-12640 or Japanese Patent Publication No. 6-
Japanese Patent No. 38959 teaches that when a mineral component in water is ionically dissociated in a tank to which an electrostatic field or an oscillating electric field is applied to deposit and remove it as a floating scale, the tank is depressurized to be deaerated.

[0004]

In the chemical injection system, there are various problems such as the toxicity of deoxidizers, the difficulty of controlling the proper amount of chemicals to be added, and the increase in the amount of chemicals to be used. , Use is restricted except for strictly controlled factories where added value is expected for drug use.

In the case of the ion exchange system, the metal salt in water is clogged in the exchange membrane, and the life of the exchange membrane due to curing is relatively short, so that maintenance is complicated, and if the exchange membrane that has been clogged continues to be used in bacteria, It is unsuitable for drinking and food processing in terms of economy and hygiene, such as harmful substances being mixed in by breeding.

The vacuum deaeration method is not widely used yet because it is difficult to handle the vacuum for the treatment of water for domestic water supply and the measures against red water in buildings, for example, but the batch treatment method is relatively easy to handle. This is a vacuum degassing device. However, the batch processing type vacuum deaerator has a limited amount of treatment because the treatment is discontinuous, and if a large amount of water needs to be treated, it must be a large-scale facility, and the facility maintenance cost However, it is not common because it is expensive.

On the other hand, when continuous large-volume treatment is required, such as in a food factory, a multi-stage continuous vacuum degassing system combining an ejector and a cyclone, which requires specialized complexity for operation and maintenance, is proposed. Although it has been adopted and equipment with sufficient processing amount per hour has been put to practical use, it has a large installation area and large equipment cost and maintenance cost, so it is suitable for industrial applications where added value can be expected from processing, and it is a general apartment house. It is not practical to use it as a deaerator for water treatment equipment in offices and office buildings, because it is economically unacceptable, including in terms of management.

[0008] Compared with the continuous vacuum degassing method using an ejector or the like, a method of introducing deionized water into a depressurized vessel and vacuum degassing dissolved oxygen, carbon dioxide gas and free chlorine in water is more effective in a batch processing method. However, in order to use a continuous treatment system, it is necessary to continuously remove degassed water while maintaining a high vacuum inside the treatment vessel. Must be large in volume, and the structure and operation for maintaining the pressure seal between the processing container and each part of the water supply and water supply system are complicated.

It is also known that organic carcinogens such as trihalomethane and trichlorethylene in water are simultaneously removed by heating and boiling the treated water in combination with vacuum degassing treatment, but it is adopted in the hot water supply system. However, in a water supply system that supplies cold water, energy for boiling is wasted, so that there is a drawback that it cannot be actually used.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a vacuum-type deaerator which is capable of continuously supplying water while using a decompression treatment container and which is relatively easy to maintain in equipment.

Further, it is possible to provide a deaerator capable of deaerating a dissolved substance without heat treatment without the need for chemical injection, or to promote vaporization of a dissolved gas efficiently during vacuum deaerating. Provide a degassing device, and further provide a degassing device capable of preventing re-contact of degassed water with air as much as possible to prevent redissolution of oxygen and carbon dioxide gas from the atmosphere in the processing system. To do so is another subject of the present invention.

[0012]

The basic idea of the present invention for solving the above-mentioned problems is to provide a main deaeration chamber for collecting and deaerating dissolved gas in water by boiling under reduced pressure, and a main deaeration chamber for deaeration. Combined with a plurality of water storage chambers that temporarily store vaporized water, alternately introduce deaerated water from the main deaeration chamber into these water storage chambers, and alternately take out deaerated water from these water storage chambers. As a result, the degassed water can be continuously fed.

The deaerator of the present invention should be installed downstream of the water treatment device disclosed in Japanese Patent Publication No. 2-11319, Japanese Patent Publication No. 2-12640 or Japanese Patent Publication No. 6-38959. By doing so, the water from which scale has been removed in these upstream water treatment devices is guided to the degassing device of the present invention to remove most of the residual dissolved gas in the water, and is continuously fed to the downstream water distribution facility. It becomes possible.

The deaerator according to the present invention comprises a main deaerator for sucking water from the water supply pipe by depressurizing the inside to atmospheric pressure or less and collecting and deaerating dissolved gas in water by depressurizing boiling, and a main deaerator. A plurality of water storage chambers that temporarily store the water deaerated in the air chambers,
A common water supply means for discharging the water stored in each water storage room to the outside, introduction of water from the main deaeration room to each water storage room, and discharge of water from each water storage room to the common water supply means The basic feature is that each water storage chamber is provided with a control unit that controls independently.

The control means includes a decompression means for decompressing the inside of the water storage chamber to atmospheric pressure or less at an independent timing for each water storage chamber, a main deaeration chamber and each water storage chamber so as to open only when the water storage chamber is depressurized. Check valves for inlets respectively provided at the water inlets between the water storage chambers and the common water supply means so as to be opened only when the decompression in the water storage chamber is released and the atmospheric pressure is restored. A check valve for the outlet may be provided.

In this case, the depressurizing means includes a vacuum pump for depressurizing the main deaeration chamber and a plurality of solenoid valves for individually connecting the upper space of each water storage chamber to the suction port of the vacuum pump. Preferably, it is possible to continuously operate the vacuum pump to reduce the pressure of the main deaeration chamber and reduce the pressure for introducing water to each water storage chamber, and not only simplify the operation mode of the vacuum pump, By controlling the opening and closing of each solenoid valve, it becomes possible to automatically control the water supply and water supply of the system.

In a preferred mode for the same purpose, the control means controls the water level detector for detecting the water level in each water storage chamber, and the timing of the pressure reducing operation in each water storage chamber by the pressure reducing means based on the detection signal of the water level detector. It is equipped with a controller.

In the degassing apparatus of the present invention, the dissolved gas in water is collected and degassed by depressurization boiling in the main degassing chamber, so heating energy for boiling the treated water is unnecessary.
Also, vacuum deaeration in the main deaeration chamber can be effectively combined with deaeration by ultrasonic vibration energy.In this case, the main deaeration chamber uses ultrasonic waves for causing cavitation in the water sucked from the water supply pipe. A vibration imparting device is provided, and in addition to vaporization of the dissolved gas by reduced pressure boiling, the vaporization effect utilizing the cavitation phenomenon by ultrasonic vibration energy is synergistically utilized.

The effect of degassing by the ultrasonic vibration is remarkably improved, and unlike the conventional ultrasonic vibration method under the condition that the water surface is open to the atmosphere in the conventional general receiving tank, in the present invention, the main degassing is performed. Since the upper space of the air chamber is operated under reduced pressure, the degassed water does not dissolve a quantity of gas from the atmosphere again according to the equilibrium partial pressure, and is almost pure water with no chlorine odor. It is possible to obtain highly pure deaerated water close to

Further, the main deaeration chamber includes an upright water pipe connected to the water supply pipe at the bottom, a storage chamber for receiving water overflowing from an upper opening edge of the upright water pipe, and an upper portion of the upright water pipe and the storage chamber. The storage chamber of the main degassing chamber in this case can be communicated with each water storage chamber at the bottom by, for example, a check valve.

When the main deaeration chamber is provided with an upright water guiding cylinder, an ultrasonic vibration imparting device for applying a standing wave of ultrasonic vibration to water filled in the upright water guiding cylinder from the bottom of the upright water guiding cylinder is provided. By installing it in the main degassing chamber, the ultrasonic wave is completely reflected on the water column that fills the upright water pipe, so the maximum ultrasonic vibration energy is transmitted, which causes cavitation to occur instantaneously and dissolved gas. Become air bubbles and are collected and removed from the upper space of the main degassing chamber, thus further increasing the efficiency of degassing.

More preferably, a floating lid is arranged on the water surface in each water storage chamber to reduce the contact area with the gas, whereby degassed water is returned when the upper space of the storage chamber is returned to atmospheric pressure. It is effectively prevented that oxygen and carbon dioxide in the atmosphere are redissolved and cause red rust in the downstream.

The deaerator of the present invention can be constructed not only as a unitary deaeration unit in which the main deaeration chamber and each water storage chamber are integrated, but also the main deaeration chamber and each water storage chamber are separated. It is also possible to configure as a can body and connect each can body with a pipe to constitute a collective facility.

It is desirable to prevent galvanic corrosion by keeping the main structural members in contact with water of the deaerator according to the present invention at the same potential including the piping under the electric grounding conditions of the third kind or higher. .

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described below with reference to the drawings. In the illustrated embodiment, the water supplied from the water receiving tank is the above-mentioned Japanese Patent Publication No. 6-38.
Combination of primary degassing of dissolved gas in a reduced pressure atmosphere and promotion of ion dissociation of unionized metal salt in treated water by an oscillating electromagnetic field, which is introduced into an electrode cylinder of a water purification apparatus disclosed in Japanese Patent No. An example of an apparatus having a constitution in which the mineral components in the treated water are precipitated and filtered as a non-adhesive free scale by the treatment and then introduced into the main degassing chamber is illustrated, but the deaerating device of the present invention is limited to this example. However, the water can be directly supplied from the water receiving tank and can be used in combination with the downstream side of other various water treatment devices.

FIG. 1 is an explanatory view showing an example of a preferred embodiment of the present invention. In this example, the inside of a cylindrical main body 1 is coaxially partitioned by an annular partition wall 5, and a cylindrical shape is formed at the center. The main deaeration chamber 2 is formed, and the annular space around the main deaeration chamber 2 is partitioned into two by a radial partition wall (not shown) to form first and second water storage chambers 3 and 4, respectively. These three chambers 2, 3 and 4 which form the main part of the deaerator are sealed independently of each other via a packing by a lid 6 having an integrally removable upper portion.

The main deaeration chamber 2 has a water pipe 7 standing upright in the center.
Is provided, the lower end of the water guiding cylinder 7 is opened to the water guiding chamber 9 communicating with the water supply pipe 8, and the upper end of the water guiding cylinder 7 is projected at a predetermined height in the upper space in the main deaeration chamber 2. ing. As a result, a storage chamber 10 that receives the water overflowing from the upper opening edge of the water guiding cylinder 7 is formed around the water guiding cylinder 7 of the main deaeration chamber 2, and the upper space of the water guiding cylinder 7 and the storage chamber 10 is depressurized. The storage chamber 10 is adapted to be used as a chamber 11, and the storage chamber 10 is communicated with the water storage chambers 3 and 4 via check valves 12 and 13 provided at water inlets below the partition wall 5, respectively. It has become. In addition, these check valves 12, 13
Is provided in a direction in which only the inflow of water from the storage chamber 10 into each of the water storage chambers 3 or 4 is permitted and the flow in the opposite direction is blocked, as will be described later.

In each of the water storage chambers 3 and 4, plastic floating lids 34 and 35 having a specific gravity of about 1 or less are arranged so as to cover most of the water surface, and these floating lids are located above and below the water level. To maintain the water surface of the stored water inside the space above the water storage chamber, and to prevent contact between the stored water and the outside air when the space above is released to the external atmospheric pressure, as described below. , The function of preventing the gas equivalent to the equilibrium pressure from being dissolved in the degassed stored water as much as possible from the outside air.

The water is supplied by descaling the water received from the water supply to the water receiving tank 14 by the electrode cylinder 15 and then sending it to the water supply pipe 8.
As disclosed in JP-A-389959, a mineral component in water is obtained by a combined treatment of degassing a dissolved gas by sprinkling water in a reduced pressure atmosphere and promoting ionic dissociation of an unionized metal salt in treated water by an oscillating electromagnetic field. Is deposited and filtered as a non-adhesive free scale, and the details thereof are described in Japanese Examined Patent Publication No. 6-38959 and will not be described here in detail.

A manual opening / closing valve 16 and a three-way solenoid valve 17 are interposed between the water receiving layer 14 and the electrode cylinder 15, and the manual opening / closing valve 16 is opened during normal operation of the apparatus. However, when it is necessary to stop the water supply such as when maintaining the deaerator, it is manually closed, and the three-way solenoid valve is operated by the controller 26 described later. Water is flowing to the electrode cylinder 15, but when water supply to the downstream is required even when the operation of the deaerator is stopped, the flow path is switched to the bypass pipe 18 side, bypassing the deaerator and receiving layer The water supply from 14 is supplied directly to the water supply port 19.

The water supply port 19 constitutes water supply means common to the water storage chambers 3 and 4, and is connected to the bottoms of the water storage chambers 3 and 4 by piping via the check valves 20 and 21 for the outlets, respectively. These outlet check valves 20 and 21 allow only the outflow of water from the water storage chamber 3 or 4 to the water supply port 19, as described later,
It is provided so as to prevent the flow in the opposite direction. A water supply pump 22 is connected to the water supply port 19, and water is supplied from the water supply pump 22 to a pressurized water tank (or an elevated water tank) 23 of the water receiving facility and is distributed to each tap 25 in the building 24. .

The upper spaces of the main deaeration chamber 2 and the water storage chambers 3 and 4 are designed to be depressurized independently of each other. As a control means therefor, a vacuum pump whose operation is controlled by a controller 26 is used. 27 and three-way solenoid valves 28, 29, 30 for selectively connecting the suction side of the vacuum pump 27 to the upper spaces of the main degassing chamber 2 and the water storage chambers 3, 4 are provided. The controller 26 controls the operation of the water feed pump 22 and the electrode cylinder 15 and also controls the three-way solenoid valves 28, 2
9, 30 are selectively switched and controlled so that the upper spaces of the main deaeration chamber 2 and the water storage chambers 3, 4 are independently connected to the suction side of the vacuum pump 27, or an external large Relieved to atmospheric pressure.

Further, the controller 26 keeps the vacuum pump 27 in the operating state at all times during the operation of the deaerator, so that the internal space of the electrode cylinder 15 is constantly operated by the vacuum pump 27 via the steam separator 33. The pressure is reduced, and the three-way solenoid valves 29 and 30 are mainly alternately switched by the controller 26, so that when one of the water storage chambers is performing the water storage operation, the other water storage chamber is reversible so that the water supply operation is performed. Operation is repeated. Further, in order to give the controller 26 the switching timing of this reversible operation,
The water storage chambers 2 and 3 are provided with water level detectors 31 and 32 for detecting whether or not the respective water surfaces exceed an upper limit or a lower limit.

Further, at the bottom of the water guiding chamber 9 in which the bottom of the water guiding cylinder 7 of the main deaeration chamber 2 is opened, an ultrasonic transducer 34 which radiates ultrasonic vibrations directed on the axis of the water guiding cylinder 7 is attached. The
This is also drive-controlled by the controller 26. In this case, since the water flow from the outlet of the water supply pipe 8 flows directly above the ultrasonic vibrator 34, the ultrasonic vibrator 34 is efficiently cooled by this water flow.

This ultrasonic oscillator 34 radiates ultrasonic vibration of several tens of kHz, and the distance from its effective vibration surface to the upper opening edge of the water guiding cylinder 7 is set to an integral multiple of half the wavelength of the radiated ultrasonic vibration. It is As a result, a standing wave of ultrasonic waves is formed in the water column that fills the inside of the water guiding cylinder 7, and ultrasonic vibrations are almost completely reflected on the water surface to cause cavitation with high efficiency, which causes dissolved gas in water to form bubbles. Becomes diffused into the upper space of the main deaeration chamber under reduced pressure. On the other hand, the upper space of the main deaeration chamber 2 is decompressed by the vacuum pump 27 so that the water inside has a vacuum degree enough to cause decompression boiling, and thus the decompression boiling and the cavitation phenomenon due to ultrasonic vibration are synergistic. Will contribute to deaeration.

When the water-dissolved gas is diffused into the upper space of the main degassing chamber 2, it is sucked by the vacuum pump 27 through the electromagnetic valve 28 and discharged from the exhaust line of the vacuum pump 27 to the outside. It is preferable to attach a deodorizing device to this exhaust line to prevent the emission of odor to the surrounding environment.

To explain the operation of the illustrated deaerator, first, the solenoid valve 17 is connected to the electrode cylinder 15 side by the controller 26 while the manual on-off valve 16 is open, and the vacuum pump is operated. Thereby, the water tank 14 to the electrode cylinder 15
Water is sucked into the upper space of the electrode, and the combined treatment of degassing the dissolved gas by water sprinkling in the reduced pressure atmosphere in the electrode cylinder 15 and promoting the ion dissociation of the unionized metal salt in the treated water by the oscillating electromagnetic field Mineral components are deposited and filtered off as a non-adhesive free scale. The scale deposited in the electrode cylinder 15 is appropriately discharged from the lower drain of the electrode cylinder 15, and the descaled water is degassed by water sprinkling in a reduced pressure atmosphere, but at a concentration that is still a problem. Dissolves oxygen, carbon dioxide, free chlorine, etc.

Therefore, the controller 26 first causes the solenoid valve 2 to
When 8 and 29 are switched to the vacuum pump side and the solenoid valve 30 is switched to the outside air side, the inside of the main deaeration chamber 2 is depressurized, so that the treated water in the electrode cylinder 15 is sucked into the water guiding chamber 9 through the water supply pipe 8. This gradually raises the water level, and finally the water pipe 7
The inside is filled and overflows from the upper opening edge into the surrounding storage chamber 10.

At this time, decompression boiling of water occurs in the water guiding cylinder 7, and in addition, cavitation occurs in the water due to the excitation by the ultrasonic vibrator 34, so that the dissolved gas in the water is instantly and actively bubbled. Upper space of deaeration chamber 2 (decompression chamber)
11 is diffused, and this diffused gas is immediately sucked and removed by the vacuum pump 27 via the electromagnetic valve 28.

Therefore, the water overflowing from the upper edge of the water guiding cylinder 7 into the storage chamber 10 is degassed water that has already been sufficiently degassed, and the water level in the storage chamber 10 is the lower inlet of the partition wall 5. When reaching the check valve 12 for use, the deaerated water in the storage chamber 10 inside the main deaeration chamber 2 is depressurized by the solenoid valve 29 to the same pressure as in the main deaeration chamber 2. Suction is performed while maintaining the same water level as the storage chamber 10.

During this time, since the second water storage chamber 4 is communicated with the outside air by the solenoid valve 30, its inlet check valve 13 is provided.
Remains in the closed state, degassed water does not flow into the inside, and therefore the water level detector 32 informs the controller 26 that it is below the set lower limit water level, so the solenoid valve 3
0 holds the communication position with the outside air. Similarly, the outlet check valve 20 is also closed because the first water storage chamber 3 side has a lower pressure than the water supply port 19 side, and the dewatered water is being introduced from the first water storage chamber 3 to the water supply port 19. Will never be started.

When the degassed water in the first water storage chamber 3 eventually reaches the upper limit water level set in the water level detector 31, the controller 26 causes the solenoid valve 29 to move to the outside air by a detection signal from the water level detector 31. At the same time as switching to the communication position, the solenoid valve 30 is switched to the communication position with the vacuum pump 27. As a result, when the inside of the first water storage chamber 3 returns to the atmospheric pressure, since the inside of the main deaeration chamber 2 is still in the depressurized state, the check valve 12 for the inlet is closed, while the check valve 20 for the outlet can be opened. Become.

Therefore, the water pump 22 is controlled by the controller 26.
When the water is activated, the deaerated water in the first water storage chamber 3 becomes
3 into the building 2 by the pressure in the pressurized water tank 23.
Water is distributed to each tap 25 of No. 4. At this time, the solenoid valve 3 is switched to the communication position with the vacuum pump 27.
0 starts depressurizing the inside of the second water storage chamber 4, and when the inside of the second water storage chamber 4 is depressurized to almost the same pressure as the inside of the main degassing chamber 2, the inlet check valve 13 The deaerated water is opened from the storage chamber 10 of the main degassing chamber 2 into the second water storage chamber 4
It is sucked while maintaining the same water level as.

During this period, the first water storage chamber 3 is communicated with the outside air by the electromagnetic valve 29, so that the check valve 12 for the inlet thereof is provided.
Remains in the closed state, and deaerated water does not flow from the main deaeration chamber 2 into the interior, and therefore the controller 26 until the water level detected by the water level detector 31 becomes below the set lower limit water level again. The solenoid valve 29 is held in a communication position with the outside air. Similarly, the check valve 21 for the outlet also has the second water storage chamber 4
Side is closed because it has a lower pressure than the water supply port 19 side,
The water supply from the second water storage chamber 4 in which the deaerated water is being introduced to the water supply port 19 is not started.

The water feed pump 2 is constructed by alternately repeating the above-described operations of sucking and guiding water in the first and second water storage chambers 3 and 4 and discharging water by returning to the external pressure in the first and second water storage chambers.
It is possible to send water almost continuously by 2. Further, since the floating lids 35 and 36 are constantly floating on the water surface in the water storage chamber where water is discharged to the water supply port 19, the water surface is almost shielded from contact with the outside air, and therefore the gas in the outside air is submerged in water depending on the equilibrium partial pressure. It does not dissolve in water and effectively prevents red rust from occurring in the downstream piping system. Needless to say, it is possible to prevent damage due to electrolytic corrosion by electrically grounding the structural members in contact with water of the entire system including the deaerator so as to maintain the same potential.

Although not shown in the illustrated example, a water level detector for detecting that the water surface has risen above the overflow level of the water guiding cylinder 7 is also provided in the main deaeration chamber 2 and is controlled by the detection signal. The vacuum pump 27 is switched to the pressure-holding operation by the device 26, and when the water level in the main degassing chamber 2 rises more than necessary, the suction of the water supply is temporarily stopped, or the solenoid valve 28 is switched to the communication position with the outside air. An additional operation mode may be prepared in which the upper space of the main deaeration chamber is released to the external atmospheric pressure and the deaeration operation is stopped in an emergency. In the illustrated example, the deaerator having an integrated unit is shown, but the main deaerator and each water storage chamber are configured as independent tanks, and even if these are connected by a piping system, a deaerator that also functions in the same way. It can be a Qi device.

[0047]

As described above, according to the present invention,
It is possible to provide a vacuum-type deaerator capable of continuously supplying water while using a decompression treatment container, and its facility maintenance is relatively simple.
It can be realized by an off-control device, does not require chemical injection, and can effectively degas dissolved substances by boiling under reduced pressure without heat treatment. Also, since it is easy to use cavitation caused by ultrasonic vibrations together, it is possible to efficiently promote the vaporization of dissolved gas during vacuum degassing, and further to re-contact the degassed water with air as much as possible. Since it is also possible to prevent re-dissolution of oxygen and carbon dioxide gas from the atmosphere in the processing system, it is possible to prevent corrosion such as red rust in the piping system.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a preferred embodiment of the present invention.

[Explanation of symbols]

 1: Cylinder body 2: Main deaeration chamber 3: First water storage chamber 4: Second water storage chamber 5: Partition wall 6: Lid 7: Upright water pipe 8: Water supply pipe 9: Water delivery chamber 10: Storage chamber 11: Decompression chamber Chamber 12: Inlet check valve 13: Inlet check valve 14: Water receiving tank 15: Electrode cylinder 16: Manual opening / closing valve 17: Three-way solenoid valve 18: Bypass piping 19: Water inlet 20: Outlet check valve 21: Check valve for outlet 22: Water pump 23: Pressurized water tank (elevated water tank) 24: Building 25: Tap 26: Controller 27: Vacuum pump 28: Three-way solenoid valve 29: Three-way solenoid valve 30: Three-way solenoid valve 31: Water level detection Device 32: Water level detector 33: Air / water separator 34: Ultrasonic transducer 35: Floating lid 36: Floating lid

Claims (10)

[Claims] 1. A main deaeration chamber for sucking water from a water supply pipe by decompressing the inside to atmospheric pressure or less and collecting and deaerating dissolved gas in water by decompression boiling, and deaeration in the main deaeration chamber. Multiple water storage chambers that temporarily store the stored water, common water delivery means for discharging the water stored in each water storage chamber to the outside, introduction of water from the main deaeration chamber to each water storage chamber, and each water storage chamber Degassing device, comprising: control means for independently controlling the derivation of water to the common water supply means for each water storage chamber. 2. The depressurizing means for depressurizing the inside of the water storage chamber to below atmospheric pressure at independent timing for each water storage chamber, the main degassing chamber and each water storage so as to open only when the water storage chamber is depressurized. Check valves for inlets respectively provided at the water inlets between the water storage chambers and the water storage chambers and the common water supply means so that they are opened only when the depressurization in the water storage chamber is released and the atmospheric pressure is restored. The deaeration device according to claim 1, further comprising: a check valve for the outlet. 3. The depressurizing means comprises a vacuum pump for depressurizing the main deaeration chamber, and a plurality of solenoid valves for individually connecting the upper space in each water storage chamber to the suction port of the vacuum pump. The degassing device according to claim 2, wherein 4. The control means comprises a water level detector for detecting the water level in each water storage chamber, and a controller for controlling the timing of the pressure reducing operation in each water storage chamber by the pressure reducing means based on the detection signal of the water level detector. The degassing device according to claim 2, wherein 5. The deaerator according to claim 1, wherein the main deaerator further comprises an ultrasonic vibration imparting device for causing cavitation in the water sucked from the water supply pipe. 6. The main deaeration chamber has an upright water pipe connected to the water supply pipe at the bottom, a storage chamber for receiving water overflowing from an upper opening edge of the upright water pipe, and an upright water pipe and an upper part of the storage chamber. The deaeration device according to claim 1, further comprising a decompression chamber including a space, the storage chamber being capable of communicating with each water storage chamber at a lower portion. 7. The main deaeration chamber is provided with an ultrasonic vibration imparting device for applying a standing wave of ultrasonic vibration to water filled in the upright water guiding cylinder from the bottom of the upright water guiding cylinder. The deaerator according to claim 6. 8. The deaerator according to claim 1, wherein a floating lid is arranged on the water surface in each water storage chamber to reduce a contact area with the gas. 9. The deaerator according to claim 1, which is configured as a deaerator unit in which a main deaerator and respective water storage chambers are integrally incorporated. 10. The deaerator according to claim 1, wherein the main deaeration chamber and each water storage chamber are made of separate cans, and the cans are connected by pipes.