JPH0747352A - Clogging detector for deaerator - Google Patents

Abstract

PURPOSE:To provide a device for detecting the clogged states of a filler and a membrane type deaerating module of a deaerator. CONSTITUTION:In a deaerator in which a filter 4 and a membrane type deaerating module 9 are connected to a water feed line 3 between a raw water feeding part 1 and a treated water distributing part 2, a differential pressure detector 10 for detecting different pressure across the membrane type deaerating module 9 provided successively on the water feeding line 3 across the membrane type deaerating module 9 is installed, and a flow detector 7 is installed in the water feeding line 3 on the downstream side of an outlet of the membrane deaerating module 9. A judgment means 12 for making judgment by receiving both the outputs of the differential pressure detector 10 and the flow detector 7 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clogging detection device for a deaerator applied to a water supply line of a cooling / heating machine or the like.

[0002]

2. Description of the Related Art As is well known, a deaerator is installed in a water supply line for cooling and heating equipment such as a boiler, a water heater or a cooler for the purpose of preventing internal corrosion of these equipment. Further, in recent years, a deaerator has come to be used as a measure for preventing red water in buildings such as buildings and condominiums.

As the degassing device, a device using a gas separation membrane is widely used because of its compactness and easy handling. In this type of deaerator, a deaeration module containing a gas separation membrane such as a hollow fiber membrane is connected in a water supply line to equipment used, and raw water (tap water Water, well water, other industrial water),
In this water passing process, the inside of the degassing module is evacuated to remove the dissolved gas in the raw water by degassing.

However, when the above deaerator is used for a long period of time, the membrane type deaerator or filter is clogged due to an unexpected accident, adhesion of dust (impurities), natural wear, etc. May not be secured, which is a problem.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a clogging detection device for a deaerator which can determine the clogging state when the membrane type deaerating module or filter is clogged. To do.

[0006]

That is, the present invention relates to a deaerator in which a filter and a membrane deaerator module are connected in a water supply line between a raw water supply section and a treated water supply section. A differential pressure detector that is connected to the water supply line before and after the membrane degassing module to detect the differential pressure across the membrane degassing module, and the flow rate detection at the water supply line downstream of the outlet of the membrane degassing module. A detector is provided, and a judging device for judging by receiving both outputs of the differential pressure detector and the flow detector is provided.

[0007]

According to the present invention, the determination is made by receiving both outputs of the differential pressure detector for detecting the differential pressure across the membrane degassing module and the flow rate detector provided on the downstream side of the outlet of the membrane degassing module. The determiner can determine the clogging state of the membrane degassing module and the filter.

[0008]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view showing the arrangement of each device of a deaerator and a clogging detector according to the present invention. This deaerator is a water supply line between a raw water supply unit 1 and a treated water supply / distribution unit 2. 3, a filter 4, a pressure reducing valve 5, a four-way valve 6, and a flow rate detector 7 are connected, and a forward / reverse flow path 8 bypassing from the four-way valve 6 is connected. A module 9 is provided, and a differential pressure detector 10 is provided on the water supply line 3 with a four-way valve 6 interposed therebetween. The differential pressure detector 10 and the flow rate detector 7 are connected to the line 1
It is configured to be connected to the judging device 12 via 1.

The filter 4 filters dust and impurities contained in raw water (tap water, well water, and other industrial water), and the pressure reducing valve 5 supplies the membrane degassing module 9 with a supply water pressure above a certain level. The membrane type degassing module 9 is prevented from being damaged because it is not added.

The four-way valve 6 is, as shown in FIG.
By changing the position of the partition plate 6a, the flow direction of the raw water can be changed. That is, A of FIG. 2 is a normal flow path (see FIG. 1) for flowing raw water from the water supply line 3 downward, and flows in from the left end of the membrane degassing module 9 and flows from the right end to the flow path 8 It flows into the water supply line 3 via the valve 6. Further, at the position of the partition plate 6a shown in FIG. 2B, it becomes a reverse flow passage in which raw water flows in a direction opposite to the normal flow passage. This is because when raw water continuously flows into the degassing module 9 from one direction, impurities such as dust adhere to the inlet of the hollow membrane and cause clogging. Therefore, the partition plate 6a should be operated appropriately. Backwash.

The membrane type degassing module 9 can be composed of, for example, a large number of hollow fiber membranes (inner diameter of about 200 μm), raw water is passed through the inside of these hollow fiber membranes, and the outside thereof is evacuated. The dissolved oxygen in the raw water is removed in the process of water passing through the hollow fiber membrane.

In the present invention, the membrane type degassing module 9 is used.
A water-sealed vacuum pump 13 is used as a means for vacuum-sucking the inside. The water-sealed vacuum pump 13 is connected via a water-sealed supply line 14 branched from the water supply line 3 to the membrane type degasser. The air module 9 is connected via a vacuum degassing line 15. The sealed water supply line 14 is provided with a constant flow valve 16 and a first solenoid valve 17, and the vacuum deaeration line 15 is provided with a second solenoid valve 18, which is a first solenoid valve. Together with 17, it operates in response to a signal from a controller (not shown). Reference numeral 19 in the drawing denotes an exhaust drainage line of the water-sealed vacuum pump 13.

The differential pressure detector 10 according to the present invention sets the normal water pressures in the water supply lines 3 on the inlet side and the outlet side of the membrane type degassing module 9 and detects the set pressure difference. The decision device 12 is notified via the line 11. On the other hand, the flow rate detector 7 is provided in the water supply line 3 on the downstream side of the outlet of the membrane type degassing module 9, detects the flow rate of the treated water, and notifies it to the decision unit 12 via the line 11. As the flow rate detector 7, a flow switch (flowing water detector) that outputs an ON-OFF signal at a predetermined flow rate and can detect only the presence or absence of a flow can be used. The notification from the differential pressure detector 10 outputs an ON signal when it is within the range of a predetermined pressure differential pressure set in advance, and outputs an OFF signal when the pressure difference deviates from the predetermined pressure differential pressure. Further, the notification from the flow rate detector 7 outputs an ON signal when it is within a preset predetermined flow rate range, and outputs an OFF signal when it does not reach the predetermined flow rate. Then, the judgment result shown in FIG. 3 is displayed on the judging device 12, and the manager is notified by, for example, an alarm device (not shown).

In the deaerator having the above structure, raw water is supplied from the raw water supply unit 1 to the water supply line 3, the filter 4, the pressure reducing valve 5, and the four-way valve 6 in response to a signal from a controller (not shown).
The water-sealed vacuum pump 13 operates while the first and second electromagnetic valves 17 and 18 are opened in accordance with the passage of the (normal passage) through the membrane type degassing module 9. Vacuum degas the dissolved gas in the raw water. When the water supply is stopped, the water ring vacuum pump 13 is stopped and the solenoid valves 17 and 18 are closed. In addition, when the judgment other than the normal is shown in FIG. 3 due to an unexpected accident during the operation of the deaerator, the deaerator is stopped or the maintenance execution time is adjusted in consideration of various conditions. .

[0015]

As described above, according to the present invention, the differential pressure detector for detecting the differential pressure across the membrane type degassing module and the flow rate detector downstream of the outlet are provided. Since the determination device that receives both outputs of the detector is provided, it is possible to detect the clogging state of the membrane type degassing module or the filter during the operation of the degassing device, and take a countermeasure process in advance.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an arrangement of respective devices of a degassing apparatus embodying the present invention.

FIG. 2 is an explanatory diagram showing the flow directions of raw water and treated water when the partition plate of the four-way valve of FIG. 1 is switched.

FIG. 3 is a determination diagram determined by detection results of a differential pressure detector and a flow rate detector of FIG.

[Explanation of symbols]

 1 Raw Water Supply Section 2 Treated Water Distribution Section 3 Water Supply Line 4 Filter 7 Flow Rate Detector 9 Membrane Degassing Module 10 Differential Pressure Detector 12 Judgment Device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Sugano 7 Horie-cho, Matsuyama-shi, Ehime, Miura Kogyo Co., Ltd. (72) Inventor Kenichiro Takematsu 7 Horie-cho, Matsuyama-shi, Ehime, Miura Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A filter 4 and a membrane degassing module 9 in a water supply line 3 between a raw water supply unit 1 and a treated water distribution unit 2.
In the degassing device, the differential pressure detector 10 for detecting the differential pressure across the membrane degassing module 9 connected to the water supply line 3 before and after the membrane degassing module 9, and the membrane The flow rate detector 7 is provided in the water supply line 3 on the downstream side of the outlet of the automatic degassing module 9, and the determiner 1 for determining by receiving both outputs of the differential pressure detector 10 and the flow rate detector
2. A clogging detection device for a deaerator, which is provided with 2.