JPH04260490A - Filtration apparatus - Google Patents

Abstract

PURPOSE:To continue the operation of a filtration apparatus within a predetermined time even when the clogging of a filter is generated. CONSTITUTION:In a filtration apparatus wherein the liquid supplied into a filter tank 5 is filtered by filter materials 13, 11 to be discharged, a preparatory filter tank 15 is provided in the filter tank 5 and the intake port of the filter tank 15 is set so as to be higher than the usual operating water level 27 of the filter tank 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device, and more particularly to a filtration device that can continue to operate within a predetermined period of time even after filtration blockage occurs.

0002

[Prior Art] In general, there are known filtration devices in which a filter medium such as activated carbon, sand, or pebbles is housed in a filtration tank to deodorize drinking water passing through the filtration tank. For example, Japanese Patent Publication No. 53-7658).

[0003] When this type of filter is operated for a long time, activated carbon powder, microorganisms, precipitates, etc. adhere to the surface of the filter medium, causing so-called filtration clogging. After a filtration blockage occurs, it is necessary to perform so-called backwashing, in which the water flows backwards to clean the filter media, or to stop the water supply and remove the filter media from the filtration tank to perform regeneration. .

Conventionally, the occurrence of filtration blockage has been detected by a water level gauge in the filtration tank, or by a pressure difference at the entrance and exit of the filtration tank.

[0005]

However, in the conventional configuration, there is a problem in that once filtration blockage occurs, the operation of the filtration apparatus must be stopped.

By the way, this type of filtration device is installed in a manufacturing plant such as a beer factory, so even if a filtration blockage occurs, there is a problem in that it may not be possible to stop it immediately depending on the operating status of the plant. There is.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to solve the problem even if filtration blockage occurs.
An object of the present invention is to provide a filtration device that can continue to operate within a predetermined period of time.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a filtration device that filters and discharges a liquid supplied into a filtration tank using a filter material, which includes a preliminary filtration tank in the filtration tank. The water intake port of the preliminary filtration tank is set higher than the normal operating water level of the filtration tank.

[0009]

[Operation] According to the present invention, during normal operation, liquid supplied into the filtration tank is filtered by the filter medium in the filtration tank and discharged. During long-term operation, activated carbon powder, microorganisms, sediment, etc. adhere to the surface of the filter medium, causing so-called filtration blockage.

[0010] When filtration blockage occurs, the water level in the filtration tank rises above the normal operating water level, so it flows into the water intake of the pre-filtration tank, which is set higher than the water level, and the pre-filtration is carried out. It is filtered through the tank's filter material and discharged. Therefore, even if filtration blockage occurs, the operation of the filtration device continues within the predetermined time period until filtration blockage of the preliminary filtration tank occurs.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a filtration apparatus according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a mixing tank made of stainless steel. Drinking water is supplied to this mixing tank 1 through an inlet pipe 1a, and ozone is also supplied through an ozone generator 3, where ozone and drinking water are mixed.

An inlet pipe 5a of a filtration tank 5 is connected to the outlet pipe 1b of the mixing tank 1, and drinking water mixed with ozone is supplied to the filtration tank 5. Further, a water supply pump (not shown) for taking out drinking water is connected to the outlet pipe 5b of the filtration tank 5.

As shown in FIG. 2, the filtration tank 5 has a punched metal 7 having pores made of stainless steel in the lower region.
An outlet chamber 9 is formed below the punched metal 7 and communicates with the outlet pipe 5b. Also, punch metal 7
A filter layer 11 made of pebbles or sand and a filter layer 13 made of activated carbon are formed above the filter.

A stainless steel preliminary filtration tank 15 is provided in the filtration tank 5 and is open at both ends, and an opening 17 at the lower end of the preliminary filtration tank 15 is closed by a punch metal 19 made of stainless steel and having pores. It is. Inside this preliminary filtration tank 15, a filtration layer 21 made of pebbles or sand with a rougher diameter than usual, and a filtration layer 23 made of activated carbon with a coarser diameter than usual are formed, and a water intake port at the upper end of this preliminary filtration tank 15 is formed. 25 is the normal operating water level 27 of the filtration tank 5
set higher.

A water level gauge 31 for detecting the water level in four stages is attached to the lid 29 of the filtration tank 5.
It has book sensors 31a to 31d. The longest sensor 31a detects the zero water level, the next sensor 31b detects the normal operating water level, the next sensor 31c detects the warning water level, and the shortest sensor 31d detects the filtration blockage water level. Further, an air bleed valve 33 is attached to the lid 29 of the filtration tank 5, thereby maintaining the internal pressure of the filtration tank 5 at a constant pressure.

Next, the operation of this embodiment will be explained.

During normal operation, drinking water supplied into the filtration tank 5 through the inlet pipe 5a is filtered by the filtration layers 13 and 11 in the filtration tank 5, and then discharged through the outlet chamber 9 and the outlet pipe 5b. . The water supply pump (not shown) connected to the outlet pipe 5b stops operating when the sensor 31a detects the zero water level.

[0019] Next, when the filtration device is operated for a long time, activated carbon powder, microorganisms, precipitates, etc. are absorbed into the filter media (activated carbon, pebbles, etc.).
It adheres to the surface of sand particles (each particle of sand) and causes so-called filtration blockage. When filtration blockage occurs, the water level in the filtration tank 5 gradually rises above the normal operation water level 27 and reaches the filtration blockage level 35.

When almost the filtration blockage water level 35 is reached, the preliminary filtration tank 1 which is set higher than the normal operation water level 27
The water flows into the water intake port 25 of No. 5, and after being filtered by the filter layers 23 and 21 of the preliminary filtration tank 15, it flows into the outlet chamber 9.
and is discharged through the outlet pipe 5b. According to this, even if filtration blockage occurs in the filtration tank 5, the preliminary filtration tank 15
The operation of the filtration device continues for a predetermined period of time until filtration blockage occurs.

The predetermined time period until filtration clogging occurs in the preliminary filtration tank 15 largely depends on the volume of the preliminary filtration tank 15. However, if the volume of the preliminary filtration tank 15 is too large in order to lengthen the predetermined time, the entire filtration device will become larger. Its volume is 10 to 30% of the volume of the filtration tank 5
It is desirable to keep it at a certain level.

According to this embodiment, even if filtration blockage occurs in the filtration tank 5, there is no need to immediately stop the operation, and the operation can be continued for a predetermined period of time, so maintenance of the filtration device can be carried out in a planned manner. can be implemented. Also, water level gauge 31
For example, if the water level of the filtration tank 5 reaches the warning water level using the sensor 31c, the lamp can be flashed, allowing you to know the remaining time that can be continuously operated. It has various effects such as being able to carry out maintenance of the filtration device.

[0023]

[Effects of the Invention] As is clear from the above explanation, according to the present invention, a preliminary filtration tank is provided within the filtration tank, and the water intake of this preliminary filtration tank is set higher than the normal operating water level of the filtration tank. Even if a filtration blockage occurs and the water level rises above the normal operating water level, the water will flow into the intake port of the pre-filtration tank, be filtered by the filter material in the pre-filtration tank, and then be discharged. The operation of the filtration device can be continued within a predetermined time period until filtration clogging of the tank occurs.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of a filtration device according to the present invention.

FIG. 2 is a longitudinal cross-sectional view showing a filtration tank.

[Explanation of symbols]

5 Filtration tank 11, 13, 21, 23 filtration layer 15 Preliminary filtration tank 25 Water intake 27 Normal operation water level 31 Water level gauge

Claims (1)

[Claims] Claim 1: A filtration device that filters and discharges liquid supplied into a filtration tank through a filter material, wherein a preliminary filtration tank is provided in the filtration tank, and the water intake port of the preliminary filtration tank is connected to a normal portion of the filtration tank. A filtration device characterized by being set higher than the operating water level.