JPH0286891A - Water purifying plant - Google Patents

Abstract

PURPOSE:To remarkably improve water purifying efficiency by providing a drain valve capable of discharging drainage not lower than constant pressure to the drain pipe for drainage of a main filter made of a reverse osmotic membrane and especially providing a flush valve to a water storage tank. CONSTITUTION:City water supplied to a prefilter 4 by a pressurizing pump 2 is sent into the pressure vessel 7 of a main filter 5 at constant pressure after impurities not larger than 5mum are removed. This city water is purified at a molecular level in such a stage that it is allowed to permeate through a reverse osmotic membrane and the impurities are nearly completely removed and thereby purified water is obtained. Simultaneously drainage contg. the impurities in the vessel 7 is discharged through a drain pipe 8. In this case, drainage is discharged at constant pressure or more by the capillary tube 13 of a drain valve 9 connected with the drain pipe 8 and therefore permeating efficiency of city water is improved. Purified water is made odorless by an activated carbon filter 14 and supplied through a bibcock 18. Further when a water storage tank 15 is filled with water, the inner pressure of a pipe of the downstream side from the main filter 5 is regulated to high pressure and a flush valve 17 is closed and water supply to the main filter 5 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a water purification device using a reverse osmosis membrane as a main filter.

[Conventional technology]

In recent years, interest in the safety of drinking water has increased, and water purifiers using activated carbon, ceramics, and recently fibers have been widely used as filters (filtration media), but these physically adsorb impurities in tap water. Because it was a thing,
Purification power decreased in a short period of time, and the filter had to be replaced frequently, and harmful substances such as trihalomethanes could hardly be removed.

As shown in Fig. 3, a water purification device that solves these inconveniences is designed to first pass tap water through a pressure pump (A) and filter it through a pre-filter (I) with a relatively coarse mesh width (for example, 5μ).
The impurities in the tap water are removed by about 50%, and this semi-finished water is then passed through a reverse osmosis membrane (c) with a pore size of 0.0001μ, a channel material (d), and a spacer (n). Water is sent to the primary side of a spiral-shaped filter that is stacked in a spiral shape and stored in a pressure vessel (H), allowing only water to pass through, and other impurities are discharged from the drain pipe (H) to produce tap water. After purifying it at the molecular level, it is passed through a regular activated carbon filter (H) to add flavor, and then it can be stored as is or in a closed pressurized tank (H), and then supplied with water from the faucet as needed. It is known what has been done.

[Problem to be solved by the invention]

However, the filter using the above reverse osmosis membrane (c) uses a pump (b) to pump the primary side of the pressure vessel (f) to a predetermined pressure (4 to 4) necessary for water to pass through the reverse osmosis membrane.
6kg/cd), but because a drain pipe (G) is opened in the above container (G) to discharge impurities blocked by the reverse osmosis membrane, the predetermined pressure is maintained. However, the problem remained that the water permeability (water purification) rate remained at a low level of around 50%.

In order to secure the primary side pressure of the container, it was considered to increase the water supply pressure of the pump, but in this case, tap water exceeding the capacity of the reverse osmosis membrane would flow from the drain pipe (G).
There is an inconvenience that a considerable amount of it is wastefully discharged and consumed in its original state along with impurities.

[Means to solve the problem]

Therefore, the present invention includes a pressurizing pump that maintains the primary side of the main filter at a constant water pressure, a pre-filter, a main filter that uses a reverse osmosis membrane with a large membrane area per unit volume, and activated carbon that communicates with the faucet. The filter and the closed water storage tank are connected sequentially from the upstream side with tubes, and the drain pipe of the main filter is provided with a drain valve for discharging waste water of a certain water pressure or above, while the water storage tank is connected to the upstream side of the main filter. The above-mentioned problems have been solved by providing a water purifier equipped with a flush valve that closes when it detects when the water is full.

[For production]

The water purification device configured as described above removes most of the impurities from tap water using a reverse osmosis membrane, and also separately discharges the impurities from a drain pipe to prevent clogging of the main filter. In addition, the drain valve attached to the drain pipe suppresses the amount of tap water discharged, thereby maintaining the primary side pressure of the main filter at a predetermined pressure (4 to 6 kg/d) and improving the permeation efficiency of tap water. At the same time, the flush valve closes by sensing the pressure in the pipe downstream of the main filter, which increases when the water storage tank becomes full, stopping water supply to the main filter and wasting tap water from the drain pipe. It has the effect of preventing leakage.

〔Example〕

Hereinafter, the configuration of the present invention will be described in more detail based on the embodiment shown in the drawings. 1 indicates a water pipe, 2 indicates a pressure pump connected to the water pipe, and 2 indicates a pressure pump connected to the pump. Water pressure detection sensor 3 feeds tap water at a constant pressure (4 to 6 kg/c1) to the primary side of the above-mentioned main filter. 4 is a pre-treatment consisting of a thread-wound filter with a mesh width of 5 μm. The filter, or 5, is the main filter, for example, a reverse osmosis membrane and a flat membrane of channel material are overlapped to make a bag shape, and this is rolled into a glue shape to form an element 6. Multiple elements are connected and there are inflow ports on both sides. The pressure vessel 7 is filled with a pressure vessel 7 having an outlet and an outlet, and a spiral type is used.

Furthermore, 8 is a drain pipe provided in an example of the pressure vessel 7,
Reference numeral 9 denotes a drain valve attached to the drain pipe 8, which discharges only waste water having a water pressure above a certain level, thereby securing a constant pressure on the primary side of the reverse osmosis membrane and increasing the reverse osmosis capacity. In this embodiment, a screen 11 with a mesh width of 25 μm is stretched on the upstream side of the inner circumference of the outer tube IO, and an inner tube 12 with both sides shielded is inserted downstream of the screen 11, and the inner tube are connected through a spiral capillary tube 13. 1
4 is a shell-structure activated carbon filter connected to the main filter 4; 15 is a closed water storage tank connected to the activated carbon filter 14; a diaphragm 16 that expands with air pressure is provided inside, and water flows through the diaphragm; By moving the water according to the amount of water and maintaining a constant internal pressure, the purified water inside the tank is shut off from the outside air. 17 is a flush valve installed between the pre-filter 4 and the main filter 5;
The valve closes in response to the pressure in the pipe on the downstream side of the main filter 5 (arrow A) that increases when the filter becomes full of water, and 1 and 8 are faucets connected to the activated carbon filter 14. , by operating lever 19,
Purified water is supplied as it is or once stored in the tank 15.

In the figure, 20 indicates an air pressure regulating valve provided below an example of the tank 15, and 21 indicates a water supply tube connecting each device.

Therefore, in the water purification device of the present invention, when the water pipe 1 is opened,
First, the pressure pump 2 operates to filter tap water into the pre-filter 4.
Here, impurities with a size of 5μ or more (approximately 50% of the total) contained in the tap water are removed, and the partially produced water is sent at a constant pressure into the pressure vessel 7 of the main filter 5. In the process of passing through a reverse osmosis membrane, it is purified at a molecular level, and impurities are almost completely removed (97%). At the same time, the waste water containing impurities remaining in the container 7 is discharged from the drain pipe 8, but it is passed through the capillary tube 13 of the drain valve 9 connected to the drain pipe, and the water is drained at a water pressure higher than a certain level. Since it is discharged, a predetermined pressure is constantly applied to the reverse osmosis membrane. Therefore, compared to the system without the drain valve 9, the refining capacity can be dramatically increased.

On the other hand, the purified water that has passed through the main filter 5 is sent to the activated carbon filter 14, where it becomes odorless and has an added flavor suitable for drinking water, and is then directly supplied from the faucet 18.

Note that when the lever 19 of the faucet 18 is closed, purified water is stored in the water storage tank 15 from the activated carbon filter 14, but when the tank 15 is empty, the diaphragm I6 is moved by the air pressure into the tank. It expands until it touches the inner surface, and when water flows in, its weight causes the diaphragm to descend.

In addition, the tank internal pressure is adjusted by the air adjustment valve 20,
Since a constant internal pressure is constantly applied, it reliably prevents bacteria from entering the purified water from the outside.

Furthermore, when the water storage tank 15 becomes full, the pressure inside the pipe on the downstream side of the main filter 5 becomes high, and in response to this pressure (arrow A), the flush valve 17 installed on the upstream side of the main filter 5 closes. However, since water supply to the main filter is stopped, water is no longer discharged from the drain pipe 8, thereby preventing wasteful consumption of tap water.

To obtain purified water when the water pipe 1 is closed, open the lever 19 of the faucet 18 and the purified water in the water storage tank 15 will pass through the activated carbon filter 14 again and be supplied to the faucet 18. This means that water will be supplied more quickly.

In addition, the water purification device of the present invention includes, in addition to the above-mentioned system,
The water storage tank 15 may be omitted and water may be supplied directly from the activated carbon filter 14 to the faucet 18.

In addition, although a spiral type main filter has been exemplified as the main filter in the present invention, a hollow fiber type in which several dozen hollow fiber membranes with an outer diameter of about 100 μm are bundled and filled into a pressure vessel, or a hollow fiber type filter with an inner diameter of about 12 μm is also available. Any filter can be used as long as it has a large membrane area per unit volume, such as a tube type filter that allows water to flow at high speed over a membrane attached to the inside of a porous pressure-resistant tube.

[Effect of the Invention 1 As described above, the water purification device of the present invention not only almost completely removes impurities from tap water, but also discharges the impurities from the drain pipe, so there is almost no clogging of the main filter. Moreover, since a drain valve is installed in the drain pipe of the main filter, the primary side of the main filter is maintained at a predetermined pressure, which dramatically improves the ratio of permeate water, that is, the efficiency of purified water compared to conventional methods. Additionally, it suppresses the amount of tap water that is discharged with impurities.

In addition, when the water storage tank becomes full, the flush valve closes and stops the water supply to the water purification device, preventing tap water from being wasted and drained from the drain pipe. The device produces excellent results that could not be expected from other devices.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the water purification device of the present invention, FIG. 2 is a sectional view of a drain valve, and FIG. 3 is a schematic diagram of a conventional example showing an enlarged cross-section of the main filter of the water purification device. In addition, in the figure 1... water pipe, 2... pressure pump, 3...
・Water pressure detection sensor, 4...Pre-filter-15...
・Main filter, 8... Drain pipe, 4... Activated carbon filter 5... Water storage tank, 7... Flash pulp, 8... Faucet. that's all

Claims (1)

[Claims] 1. A pressurizing pump 2 that maintains the primary side of the main filter at a constant water pressure, a pre-filter 4, a main filter 5 that uses a reverse osmosis membrane with a large membrane area per unit volume, and activated carbon that communicates with the faucet 18. The filter 14 and the closed water storage tank 15 are sequentially connected from the upstream side by a tube 21, and the drain pipe 8 of the main filter 5 is provided with a drain valve 9 for discharging waste water with a water pressure higher than a certain level. 5. A water purification device characterized in that a flush valve 17 is provided on the upstream side of a water storage tank 15 to detect when the water storage tank 15 is full and close the valve.