JP2000024417A - Water cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the agitation impact effect among granular filter media not less than a prescribed one even if temperature of washing water for a filter means is changed. SOLUTION: Temperature of washing water is detected by a thermistor 26 and a flow rate of the washing water flowing into a filter means 19 is controlled by a washing flow rate control valve 25 and a washing flow rate control circuit 27a. In this way, even if the temperature of the washing water is changed, the rising rate of granular filter media 19b on backward washing can be fixed to secure stable washing performance and also to reduce the discharge of the granular filter media 19b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for purifying bath water for business use or home use.

[0002]

2. Description of the Related Art As a conventional water purifying apparatus of this type, as shown in FIG. 5, a bathtub water system for filtering a bathtub water through a filter while circulating the water by a pump is provided with a backwashing circuit for the filter. Equipped with a high-temperature water supply circuit that supplies high-temperature water from a water heater to
There is one that cleans the filter with the above high-temperature water (for example, Japanese Patent Application Laid-Open No. Hei 9-117382).

In FIG. 1, reference numeral 1 denotes a water heater that heats water supplied from a water supply pipe 2 and backwashes a filtration tank 3 and a hair catcher 4 filled with glass beads. Reference numeral 5 denotes a bathtub, and reference numeral 6 denotes a pump for circulating the bathtub water while filtering it through the hair catcher 4 and the filtration tank 3. Further, reference numeral 7 denotes a heater provided in the circulation circuit 8 for keeping the temperature of the bath water. 9, 10, 11, 12, 13, 1
Reference numerals 4 and 15 denote a three-way switching valve and a switching valve for switching the flow of water, respectively.

In this configuration, the switching three-way valves 10, 1
When the pump 6 is operated, the bathtub water is filtered by the hair catcher 4 and the filtration tank 3 and is heated by the heater 7 to the bathtub 5 by switching 1, 12, 13, and 14 so that the circulation circuit 8 communicates. Will be returned. In addition, switching three-way valves 10, 1
1, 12, 13, and 14 are switched to allow water to flow from the water heater 1 to the filtration tank 3 and the hair catcher 4, and the on-off valve 15
When is opened, high-temperature water of 63 ° C. or higher is passed from the water heater 1 to the filtration tank 3 and the hair catcher 4 to wash the filtration tank 3 and the hair catcher 4, discharge dirt to the outside, and sterilize and wash.

[0005]

However, in the above-mentioned conventional water purifying apparatus, in order to sterilize and wash the filtration tank with high-temperature water, the filtration is performed using a filtration tank filled with glass beads without using the decomposing action of microorganisms. Was. However, when the temperature of the backwash water changes with granular filter media such as glass beads, the viscosity of the water changes, and the rise rate of the filter media changes. There was a problem that. Furthermore, when the water (dead water) remaining in the pipe is at a low temperature when it is sent from the water heater, there is a problem that the rising rate of the filter medium becomes large in the initial stage of the backwash, and the filter medium is discharged to the outside.

[0006]

In order to solve the above-mentioned problems, the present invention provides a filter means filled with a particulate filter medium, and a backwash means for washing the filter means by passing water in a direction opposite to the filtration direction. A temperature detecting means for detecting the temperature of the washing water for washing the filtering means, and a washing flow rate adjusting means for adjusting the washing flow rate according to the temperature of the washing water.

According to the above invention, when the filter tank is backwashed, the temperature of the backwash water is previously detected by the temperature detecting means, and the backflow water is adjusted by the washing flow rate adjusting means in accordance with the viscosity of the backwash water. By changing the washing flow rate, the rising rate of the filter medium can be kept constant. Further, since the particulate filter medium can be prevented from being discharged from the filtration tank at the start of backwashing, filtration performance can be stably secured even when used for a long time.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, a water purifying apparatus according to claim 1 of the present invention is arranged such that water is passed through a filtering means filled with a particulate filter medium in a direction opposite to a filtering direction. Back washing means for washing the filtering means, temperature detecting means for detecting the temperature of the washing water for washing the filtering means, and washing flow rate adjusting means for adjusting the washing flow rate according to the temperature of the washing water. is there.

The temperature of the washing water is detected by the temperature detecting means, and the backwash flow rate is determined by the washing flow rate adjusting means. The water temperature and the viscosity have an inversely proportional relationship. If the washing flow rate is constant, the rising rate of the particulate filter medium increases as the water temperature decreases, and the rising rate decreases as the water temperature increases. Therefore, when the washing temperature is lower than the predetermined temperature, the washing flow rate is increased, and when the washing temperature is higher, the washing flow rate is increased, thereby making it possible to keep the rate of increase of the granular filter medium constant. For example, even if the water temperature changes depending on the place of use or the season, the flow rate is controlled by the backwash flow rate adjusting means to keep the filter medium rising rate constant, thereby preventing the particulate filter medium from being discharged from the filtering means. Can be. In addition, the stirring of the granular filter media and the contact between the filter media can be performed stably,
Dirt adhering to the particulate filter medium at the time of filtration can be efficiently removed, and the filtration means can be stably washed.

[0010] The bath water purifying apparatus according to claim 2 of the present invention comprises:
It has backwashing time adjusting means for varying the washing time of the filtering means in accordance with the temperature of the washing water, and high-temperature washing water supply means for increasing the temperature of the backwashing water.

The temperature of the washing water is detected by the temperature detecting means, and the washing time is determined such that the lower the temperature of the washing water, the longer the washing time of the filtration tank. In other words, even if the generation temperature of the washing water in the heating unit such as a water heater varies depending on the water temperature and the outside air temperature, the washing (dissolution) power of the washing water is maximized and the minimum amount of backwashing water is ensured. And the filtration means can be stably washed.

A bath water purifying apparatus according to a third aspect of the present invention comprises:
At the start of backwashing, the cleaning flow rate adjusting means is controlled so that the cleaning flow rate increases stepwise or gradually.

[0013] When the water is filtered, the granular filter medium and dirt condensed to form a lump are gradually or gradually increased by the washing water, and the dirt deposited on the upper layer of the granular filter medium rises to the outside. Is discharged. At the same time, the granular filter media is gradually divided and dispersed from a lump, and the granular filter media collide with and come into contact with each other. In this case, the dirt adhering to the granular filter medium is easily peeled off, and the cleaning performance of the filter medium is improved. In addition, even if the air accumulated in the pipe flows into the filtering means at the start of the supply of the washing water, the washing flow rate is small and is not discharged at once, so that the particulate filter medium is caught by the rise of the air bubbles and becomes difficult to rise. It is difficult to discharge to the outside.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic configuration diagram showing a filtering / backwashing operation state of a water purification apparatus according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 16 denotes a circulation pump which is a forced circulation means for circulating water in a bathtub 17, and reference numeral 18 denotes a circulation circuit. Reference numeral 19 denotes a filtering means provided in the circulation circuit 19, which includes a housing 19a and a granular filter medium 19b filled therein.
And a filter bed 19c that supports the granular filter medium 19b. Reference numeral 20 denotes a water heater provided in the circulation circuit 19 for controlling the heat retention and reheating of circulating water.
, A heat exchanger 20b, and a thermistor 20c for detecting the temperature of hot water in the bathtub 17. Reference numeral 21 denotes a first flow path switching valve (electrically operated three-way valve),
An upper side of the filtering means 19 is provided so as to be connected to the drain pipe 22. 23 is a second flow path switching valve (electrically operated three-way valve)
The downstream side of the filtration means 20, the return side to the bathtub 18,
It is provided so as to connect the discharge side of the circulation pump 16. Reference numeral 24 denotes a washing pipe provided to connect the downstream side of the heat exchanger 20b to the second flow path switching valve. 25
Is a cleaning flow rate control valve provided in the cleaning pipe, and 26 is a thermistor for detecting the temperature of the cleaning water provided in the circulation circuit between the filtering means 19 and the second flow path switching valve 23. 2
7 is a circulation pump 16, a water heater 20, a first flow path switching valve 2
1, a controller for controlling the operation of the second flow path switching valve 23 and the cleaning flow control valve 25, and a cleaning flow control circuit 27a for controlling the degree of opening and closing of the cleaning flow control valve 25 by a signal received by the thermistor 26 therein; , A slow flow control circuit 27 for gradually increasing the output of the circulation pump 16 at the start of cleaning
b is provided.

Next, the operation and action at the time of filtration will be described with reference to FIG. First channel switching valve 2 by controller 27
1 communicates with the circulation pump 16 and the filtration means 19, the second flow path switching valve 23 switches the state of communication between the discharge side of the bathtub 17 and the filtration means 19, and when the circulation pump 16 operates, as indicated by the wavy arrow. Then, the hot water in the bathtub 17 circulates in the circulation circuit 18, and is filtered by the particulate filter material 19 b filled in the filtering means 19, whereby suspended substances contained in the bathwater are separated by filtration and returned to the bathtub 17. At this time, the temperature of the bath water is controlled by thermistor 20.
The heating is controlled by the water heater 20 so as to be detected at c and reach a predetermined temperature.

If this state is continued, the circulating water is filtered and clarified.
Soil is deposited from the upper layer to the middle layer of the filter medium layer formed in the step (1), the water flow resistance of the filter means 19 is increased, and the circulation flow rate is reduced.

Next, the operation and action of the filtering means 19 during washing will be described with reference to FIGS. FIG. 2 is a graph showing a gentle flow control characteristic, FIG. 3 is a schematic diagram showing a backwashing state of the filtration means, and FIG.

The controller 27 switches the first flow path switching valve 21 between the filtering means 19 and the drainage pipe 22, and the second flow path switching valve 23 switches between the washing pipe 24 and the filtering means to communicate with each other. Is operated, water flows as shown by the solid line arrow, flows into the filtering means 19, and dirt deposited in the filtering means 19 is discharged from the discharge pipe 22 to the outside. At this time, the circulation pump 16 is connected to the slow flow control circuit 2 as shown in FIG.
7B, the output is adjusted and the flow rate 28 is controlled so as to increase stepwise, so that the state shown in FIG. 3A is changed to the state shown in FIG. 3B, and the dirt 29 deposited on the upper layer of the particulate filter medium is changed. Only begins to separate first and the particulate filter media begins to disperse. As time further elapses, the flow rate increases and
(C), the rate of rise of the particulate filter medium 19b is kept constant, and the particulate filter medium 19b is completely dispersed. In this case, the stirring is performed according to the flow of the washing water, and the granular filter medium 1 is stirred.
The dirts 9b come into contact with each other, and the dirt 29 attached to the surface comes off, and the peeled dirt 29 flows upward. Finally, the state shown in FIG. 3D is reached, and most of the dirt 29 in the filtering means 19 is discharged. In this state, the circulation pump 1
6 is stopped, the state shown in FIG.

Further, when the washing water flows into the filtration means,
The temperature of the washing water is detected by a thermistor 26 provided below the filtering means, and this signal is sent to the washing flow rate adjusting means to open and close the washing flow rate adjusting valve 25 so as to have a characteristic 30 as shown in FIG. The degree is adjusted, and the amount of washing water flowing into the filtration means 19 is adjusted. Therefore, after the operation of the slow flow control circuit, the filter medium rising rate is kept constant even if the viscosity of the washing water changes according to the temperature of the washing water.

The present embodiment has the following effects. (1) Since the thermistor for detecting the temperature of the washing water is provided near the downstream side of the filtering means, the rising rate of the filter medium can be linearly controlled, and the rising rate of the filter medium can be stabilized.

(2) Since the filtering means is washed using the bath water, the water can be reused and is economical.

(3) Since high-temperature water from the water heater can be supplied to the filtering means, the inside of the filtering means can be sterilized at high temperature, and the proliferation of bacteria in the filtering means can be suppressed.

[0025]

As described above, the water purifying apparatus according to the first aspect of the present invention determines the backwash flow rate based on the temperature of the wash water. In other words, by keeping the rate of rise of the filter medium according to the viscosity of the backwash water constant, it is possible to prevent the particulate filter medium from being discharged from the filtering means. In addition, the stirring of the granular filter media and the contact between the filter media can be stably ensured, and the cleaning performance of the granular filter media can be stably secured. Therefore, long-term filtration performance of the filtration unit can be secured.

In the bath water purifying apparatus according to the second aspect of the present invention, the cleaning flow rate and the cleaning time are determined in accordance with the temperature of the cleaning water. Even if the temperature changes, it is possible to reliably perform washing with a minimum amount of backwash water while utilizing the dissolving power of high-temperature water.

Further, in the bath water purifying apparatus according to the third aspect, since the washing water is controlled to be intermittent at the time of starting the backwashing or the flow rate of the washing water is gradually increased, the particulate filter medium is externally provided at the beginning of the washing. The filter medium can be reliably separated into pieces without being discharged to the filter medium, and dirt attached to the granular filter medium can be easily separated and separated. Further, since the air accumulated in the pipe is not discharged to the outside at once at the time of back washing, it is possible to prevent the particulate filter medium from adhering to the bubbles and rising to be discharged to the outside.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a filtering and backwashing operation of a water purification device according to a first embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a moderate flow control characteristic.

FIG. 3 (a) is a schematic diagram of the filtration unit before backwashing in a backwashing state; (b) is a schematic diagram of the initial stage of cleaning in the backwashing state of the filtration unit; d) Schematic diagram of the latter stage of the washing in the backwashing state of the filtering means. (e) Schematic diagram of the filtering means after the washing in the backwashing state.

FIG. 4 is a characteristic diagram showing control characteristics of cleaning water temperature and cleaning flow rate (cleaning flow rate).

FIG. 5 is a schematic configuration diagram of a conventional water purification device.

[Explanation of symbols]

 Reference Signs List 16 circulation pump 17 bathtub 18 circulation circuit 19 filtration means 19b granular filter medium 20 water heater 21 first flow path switching valve 22 drain pipe 23 second flow path switching valve 24 washing pipe 25 washing flow control valve 26 thermistor 27 controller 27a washing Flow control circuit 27b Slow flow control circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) B01D 29/36 A 29/38 510B 520A

Claims (3)

[Claims] 1. A filtering means filled with a particulate filter medium, a backwashing means for washing the filtering means by passing water in a direction opposite to a filtering direction, and a temperature for detecting a temperature of washing water for washing the filtering means. A water purification apparatus comprising: a detection unit; and a washing flow rate adjusting unit that adjusts a washing flow rate of the filtering unit according to a temperature of the washing water. 2. A water purifying apparatus according to claim 1, further comprising backwashing time adjusting means for varying the washing time of the filtering means in accordance with the temperature of the washing water, and high-temperature washing water supply means for increasing the temperature of the backwashing water. . 3. The water purifying apparatus according to claim 1, wherein the washing flow rate adjusting means is controlled so that the washing flow rate increases stepwise or gradually at the start of the backwashing.