JP2999153B2 - Backwashing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backwashing device for backwashing a filter medium in a filtration tank of a filtration device, and more particularly, to a backwashing device.
The present invention relates to a backwashing device suitable for use in a bathwater circulating filtration device that filters and purifies bathwater from a bathtub while circulating the bathwater.

[0002]

2. Description of the Related Art Conventionally, there has been known a bath water circulating filtration device for filtering and purifying bath water from a bath tub while circulating the bath water. This bath water circulating filtration device pumps up the bath water from the bath tub, filters and purifies it with the filtration device, keeps it at a constant temperature, returns it to the bath tub and circulates it, and exchanges hot water in the bath tub daily. No, it is possible to take a bath 24 hours a day.

[0003] Incidentally, the filtration and purification of bath water in such a bath water circulating filtration apparatus is performed by passing the bath water through a filter medium filled in a filtration tank. As foreign matter such as dirt adheres, during long-term use, the filter medium is artificially taken out and washed to remove the foreign matter adhering to the filter medium, or the fluid during mechanical filtration and circulation is removed. It is necessary to flow the fluid in the opposite direction to the flow to perform backwashing. In this backwashing device, foreign matter such as dirt adhered to the filter medium is not completely removed by merely flowing the fluid in the opposite direction to the flow at the time of ordinary filtration circulation, so that the filter medium is agitated. The means have already been proposed by several applications. For example, the actual Kaihei 3
In JP-A-67955, at the time of backwashing, a spiral stirring member is rotated by a driving member such as a motor to rotate a filter medium in a filtration tank, thereby stirring the granular filter medium and removing foreign matters adhering to the surface of the granular filter medium. Backwashing devices have been proposed.

[0004]

However, in such a conventional backwashing apparatus, a stirring member and a driving member need to be provided in the filtration tank, so that the number of parts increases and the manufacturing cost increases. However, there is a problem that the filter medium may be damaged or broken by stirring the filter medium, and the filter medium is not completely stirred except for a portion where the stirring member in the filtration tank passes.

The present invention has been made in view of such problems of the prior art, and can be manufactured at a low cost, has no risk of damaging or destroying the filter medium, and completely removes foreign matter adhering to the filter medium. It is an object to provide a backwashing device that can be removed.

[0006]

A backwash apparatus according to the present invention for solving the above-mentioned problems is a backwash apparatus for backwashing a filter medium in a filtration tank. Fluid discharging means for discharging fluid in a direction perpendicular to or substantially perpendicular to the direction in which the bath water flows during normal circulation is provided, and the fluid discharging means includes a direction in which the filter medium spirals or A first discharge port for discharging a fluid in a direction similar to this, a direction in which the filter medium spirally turns in a direction opposite to the spiral turning direction of the filter medium by the fluid from the first discharge port, or A second discharge port that discharges a fluid in a direction similar to this, and the direction in which the fluid discharges is switched to either the direction from the first discharge port or the direction from the second discharge port. And a switching unit. Is shall.

In the present invention, the fluid discharged by the fluid discharging means is preferably a jet jet in which water and air are mixed.

[0008]

[0009]

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
Will be described. FIG. 1 is a schematic diagram showing a bath water circulation / filtration device including the backwash device of the first embodiment. In FIG. 1, 1 is a circulation pump for pumping bath water from a bathtub, 2 is a hair catcher for removing dust and the like in the pumped bath water from the bath water, and 3 is a hair catcher 2 in the hair catcher 2. A three-way switching valve, which is attached and comprises a thermistor for detecting the temperature of bath water, and switches the flow of bath water between circulation (during normal filtration operation) and backwashing. Reference numeral 5 denotes a filtration tank provided with a large number of small-grained filter media 6, 5a denotes a bath water inlet for introducing bath water into the filtration tank 5 during circulation (during normal filtration operation), and 5b denotes a filtration tank during circulation. The bath water filtered in step 5 is filtered into a filtration tank 5
A bath water outlet 7 for discharging water from the filter is a pressure gauge or a pressure sensor for detecting the pressure in the filtration tank 5. In addition,
The bath water inlet 5a serves as a port for discharging bath water used for back washing from the filtration tank 5 during back washing. Also,
As the filter medium 6 in the filtration tank 5, granules made of fired ceramics, glass beads, resin granules, or natural stones such as barley stone can be used. In addition, it is desirable that the cross section of the outer peripheral side wall of the filter tank 5 is circular so that the inner filter medium 6 can be easily swirled. For that purpose, the shape of the filtration tank 5 is, for example, as shown in FIG.
It is desirable to have a cylindrical shape as shown in FIG. 2, a shape combining a mortar as shown in FIG. 2 (b), or a mortar shape as shown in FIG. 2 (c).

In FIG. 1, reference numeral 8 denotes a switching valve which is opened during filtration circulation and closed during backwashing and rinsing operation, and 9 a boiler for keeping the temperature of bath water from the filtration tank 5 as required during filtration circulation. The heating means 10 is a switching valve which is closed during circulation and backwashing and is opened during rinsing operation, and the reference numeral 11 is a switching valve which is closed during circulation and rinsing operation and opened during backwashing.

In FIG. 1, reference numeral 15 denotes a jet provided on the side wall of the filtration tank for discharging a jet jet formed by mixing bath water and air from the switching valve 4 into the filtration tank 5 during backwashing. A jet discharge section 16 is an air pump for sending air to the jet jet discharge section 15,
Reference numeral 17 denotes an electromagnetic valve provided between the jet jet discharge section 15 and the air pump 16. The air from the air pump 16 and the electromagnetic valve 17 is sent to the jet jet discharge unit 15 via an air supply unit 18 attached to the side wall of the filtration tank 5. In FIG. 1, reference numeral 20 denotes a control device constituted by a microcomputer or the like, and the temperature sensor 3, the pressure gauge 7, and an operation panel 21 operated by a user.
The pump 1, the three-way switching valve 4, the switching valves 11, 8, and 10, the air pump 16, the electromagnetic valve 17, and the heating means 9 such as a boiler are controlled based on signals from the apparatus.

Next, the operation of the first embodiment will be described.
In FIG. 1, the arrow indicated by (1) indicates the flow of bath water during backwashing, the arrow indicated by (2) indicates the flow of bath water during filtration circulation, and the arrow indicated by (3) indicates the flow during rinsing operation. The flow of bath water is shown.

During normal filtration and circulation, the bath water is circulated and filtered in the flow indicated by the arrow (2). That is, the filtration tank 5
The bath water is supplied from the bath water inlet 5a on the upper left side of the drawing, and the supplied bath water is passed through the filter medium 6 to be filtered and purified. The water is discharged from a bath water discharge port 5b on the lower right side of the figure and sent to a heating means 9 such as a boiler.

During the normal circulation, if the filter medium 6 becomes clogged due to adhesion of foreign matter or a biological filtration membrane such as aerobic bacteria, the pressure in the filtration tank 5 increases. When the increase in the pressure in the filtration tank 5 is detected by the pressure gauge or the pressure sensor 7, the signal is sent to the control device 20. Then, the controller 20 controls the pumps 1 and 16 and the valves 4, 11, 8, 10,
And 17 are controlled, so that the flow of bath water also
The flow switches to the backwashing flow indicated by the arrow in (1). When the backwashing is completed, the control device 20 controls the pumps 1 and 16 and the valves 4, 8, 10, 1 so as to perform the rinsing operation.
1 and 17 are controlled, and the flow of the bath water is also switched to the flow indicated by the arrow in (3) of FIG. Thus, the cleaning of the clogging of the filter medium in the filtration tank 5 is completed.

Next, the operation at the time of back washing according to the first embodiment will be described in detail. At the time of back washing, the control device 20
As a result, the circulation pump 1 is driven, and bath water is drawn from the bathtub. The pumped-up bath water is sent to the jet jet discharge section 15 on the lower left side of the filtration tank 5 by switching the three-way switching valve 4 by the control device 20. The air pump 16 and the solenoid valve 17 are turned on by the control device, and the air is sent to the jet jet discharge unit 15 via the air supply unit 18. As shown in FIG. 3, in the jet jet discharge section 15, the air from the air pump 16 and the bath water (backwash water) from the three-way switching valve 4 generate a negative pressure generated structurally in the jet jet discharge section 15. To form a jet jet, which is immediately discharged directly to the filter medium 6 in the filter tank 5.

Further, at the time of back washing, the control device 20 closes the valve 8 and the valve 10 and opens the valve 11, so that the water is supplied into the filtration tank 5 from below. The jet flows while flowing upward in the filtration tank 5 from below in the figure while rotating in a spiral shape. That is, the flow from the lower side to the upper side in the filtration tank 5 in FIG. 1 is the flow of the backwash water (bath water). As described above, the jetting location of the jet jet is a location below the filtration tank 5 (near the bottom), which is the first position of the backwash water flow, and a location near the side wall of the filtration tank 5. It is desirable.

As described above, at the time of back washing, the bath water flows upward from below in the drawing in the filtration tank 5, and is discharged from the bath water inlet 5a. The bath water discharged from the filtration tank 5 is treated as drainage through the switching valve 11.

As shown in the plan view of FIG. 4 (a) or the perspective view of FIG. 4 (b), the jet jet from the jet jet discharge section 15 is tangent to the circular cross section of the outer peripheral side wall of the filtration tank. This is performed in a direction or a direction similar thereto. Due to the discharge of the jet jet, the filter medium 6 is swirled in the filter tank 5 and washed while being stirred by the jet jet. As a result, foreign matters and the like adhering to the surface of the filter medium 6 are peeled off from the filter medium 6, and the filter medium 6 is reliably washed with the water of the jet stream.

The fluid for swirling and stirring the filter medium 6 may be other than a jet jet, for example, only bath water. However, a jet jet is more suitable for swirling a filter medium having a relatively large specific gravity, such as small ceramic grains and natural stones such as barley stone. According to the jet jet, even a filter medium having a relatively large specific gravity can be easily swirled, and the filter medium can be vigorously stirred to effectively separate and remove a biofilm, a body hair, and the like attached to the surface of the filter medium. The electromagnetic valve 17 and the air supply unit 18
By adjusting the air amount by operating the air amount adjusting valve 22 provided between them, it is possible to cope with filter media having various specific gravities. That is, a filter medium having a relatively small specific gravity (eg, resin-made granules or spiral shapes, or pumice or sand)
When the air amount adjusting bubble 22 is used with a small opening degree even when the air jet is used, the momentum of the jet jet from the jet jet discharge port 15 can be weakened. Without being discharged together with the washing water, foreign substances such as dirt adhered to the filter 6 can be completely separated and removed.

When the backwashing is completed, the control unit 20
Rinsing is performed. This rinsing is carried out in the same manner as in the filtration circulation, with the bath water inlet 5 above the filtration tank 5.
From a, the bath water is supplied into the filtration tank 5 and passes through the filter medium 6 from above to below. However, during this rinsing,
Unlike during the circulation, the bath water passed through the filter medium 6 is not sent to the heating means 9 such as a boiler as it is, but is treated as wastewater via the switching valve 10. Thereby, it is possible to prevent foreign matters such as dirt separated and removed from the filter medium 6 at the time of back washing from remaining in the filtration tank 5 from entering the bathtub. In FIG. 4, illustration of the air pump 16 and the air supply unit 18 is omitted for convenience.

As described above, according to the first embodiment,
At the time of backwashing, the jet jet is directed tangentially to the outer periphery of the side wall of the filtration tank 5 (in the first embodiment, since the cross section of the outer periphery of the side wall of the filtration tank 5 is substantially circular, the tangential direction substantially coincides with the spiral direction of the filter medium 6) Since the filter medium is ejected in a direction close to the direction, the filter medium in the filter tank 5 is vigorously stirred in a spiral shape, so that foreign substances are effectively removed from the surface. In particular, in the first embodiment, the bath water discharge port 5b from the filtration tank 5 during normal filtration circulation and the rinsing operation and the jet jet discharge port 15 during backwashing are formed separately without being shared with each other. In particular, a large effective inner diameter of the fluid passage portion can be ensured particularly during normal filtration circulation and rinsing operation, so that a sufficient discharge of bath water can be ensured, and improvement in filtration performance can be expected.

In the first embodiment shown in FIG. 1, the jet jet discharge section 15 and the air supply section 18 are attached below the side wall of the filtration tank 5, but the present invention is not limited to this. Alternatively, the filter tank 5 may be attached to a location near the bottom side wall.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, as shown in FIG. 5, two jet jet discharge portions 31a and 31b are provided on the side wall of the filtration tank 5. Then, by controlling the three-way switching valve 32 in accordance with a signal from the control device 20, first, a spiral flow in the direction indicated by the arrow α in FIG. The jet flow is discharged from the jet jet discharge section 31b to form a spiral flow in the direction indicated by the arrow β (the direction opposite to the spiral flow indicated by the arrow α) in FIG. in this way,
According to the second embodiment, since the swirling direction of the spiral flow of the filter medium 6 can be reversed from the middle, foreign matter can be more efficiently and reliably removed. In FIG. 5, illustration of the air pump 16 and the air supply unit 18 is omitted for convenience.

Embodiment 3 FIG. Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, one jet jet discharge section 41 is attached below the side wall of the filtration tank 5. As shown in FIGS. 6A and 6B, the jet jet emission section 41 emits a jet jet toward the center of the circular cross section of the filtration tank 5. In addition, a jet jet discharged from the jet jet discharge section 41 is provided on the inner surface of the side wall of the filtration tank 5 by two jets.
A distribution unit 42 for distribution in one direction is formed. The jet jet discharged from the jet jet discharge unit 41 is divided right and left by the distribution unit 42, and rotates in the clockwise direction and the counterclockwise direction, respectively, as indicated by dashed arrows in FIG. Therefore, according to the third embodiment as well, the filter medium 6 in the filtration tank 5 can be swirled and agitated, and the foreign substances attached to the surface thereof can be almost completely removed.

Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, below the side wall of the filtration tank 5, two jet jet discharge units 51 and 52 are attached at a predetermined distance from each other. These two jet jet discharge parts 51, 52 are:
The jet jets are provided substantially parallel to each other and emit jets in the same direction substantially parallel to each other. Bath water for forming a jet jet is alternately supplied from the pump 1 to the two jet jet discharge units 51 and 52 alternately at predetermined time intervals via a three-way switching valve 53. It has become so. Therefore, in the fourth embodiment, since the jet jets are alternately discharged from the two jet jet discharge units 51 and 52 at predetermined intervals, the filter medium 6 in the filtration tank 5 can be effectively used. Stirring is performed, and the foreign matter is almost completely removed. In the fourth embodiment, the bath 1 is simultaneously supplied with the bath water from the pump 1 to the two jet jet discharge units 51 and 52, so that the jet jets are discharged from the two jet jet discharge units 51 and 52. May be simultaneously released.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, below the side wall of the filtration tank 5, two jet jet discharge parts 61 and 62 are attached to opposite positions via the center of the cross section of the filtration tank 5 in opposite directions. I have. These two jet jet discharge parts 61, 62
The jet jets are provided substantially parallel to each other and emit jets in opposite directions substantially parallel to each other. Bath water for forming a jet jet is alternately supplied from the pump 1 to the two jet jet discharge units 61 and 62 alternately at predetermined time intervals via a three-way switching valve 63. It has become so. Therefore, in the fifth embodiment, the jet jets are alternately discharged from the two jet jet discharge portions 61 and 62 at predetermined intervals, so that the filter medium 6 in the filtration tank 5 can be effectively used. Stirring is performed, and the foreign matter is almost completely removed. In the fifth embodiment, the bath 1 is simultaneously supplied with the bath water from the pump 1 to the two jet jet discharge units 61 and 62, so that the jet jets are discharged from the two jet jet discharge units 61 and 62. May be simultaneously released.

Embodiment 6 FIG. Next, a sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment, below the side wall of the filtration tank 5, the two jet jet discharge portions 71 and 72 are separated from each other by a distance approximately one-quarter of the circumference of the cross section of the side wall of the filtration tank 5. They are mounted so as to be substantially orthogonal to each other in the direction toward the center of the cross section. Therefore, these two jet jet discharge parts 7
Numerals 1 and 72 discharge jet jets in directions substantially orthogonal to each other. Further, bath water for forming a jet jet is alternately supplied from the pump 1 to the two jet jet discharge sections 71, 72 alternately at predetermined time intervals via a three-way switching valve 73. It has become so. Therefore, in the sixth embodiment, since the jet jets are alternately discharged from the two jet jet discharge portions 71 and 72 every predetermined time, the filter medium 6 in the filtration tank 5 is effectively removed. Stirring is performed, and the foreign matter is almost completely removed. In the sixth embodiment, bath water is simultaneously supplied from the pump 1 to the two jet jet discharge units 71 and 72, and the jet jets are discharged from the two jet jet discharge units 71 and 72. May be simultaneously released.

[0029]

As described above, according to the present invention, the fluid discharging means discharges the fluid in a direction perpendicular or substantially perpendicular to the direction in which water for normal filtration flows in the filtering device. And the fluid is alternately discharged in two directions, that is, the swirling direction of the spiral of the filter medium and the swirling direction of the opposite spiral, or in a direction similar thereto. To be able to
Since the swirling direction of the spiral flow of the filter medium can be reversed during backwashing, foreign matter can be removed more efficiently and reliably.

Further, by making the fluid into a jet jet in which water and air are mixed, even a filter medium having a relatively large specific gravity can be easily swirled, and the filter medium can be vigorously agitated. Biofilms, body hairs, etc. attached to the surface can be effectively separated and removed.

[0031]

[0032]

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the overall configuration of a bath water circulation filtration device including a backwash device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram for explaining an example of a shape of a filtration tank according to the first embodiment.

FIG. 3 is a diagram for explaining a configuration of a jet jet discharge unit according to the first embodiment.

FIG. 4 is a schematic diagram for explaining the direction of discharge of a jet jet according to the first embodiment.

FIG. 5 is a schematic diagram illustrating a backwashing device according to a second embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating a backwashing device according to a third embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating a backwashing device according to a fourth embodiment of the present invention.

FIG. 8 is a schematic diagram for explaining a backwashing apparatus according to Embodiment 5 of the present invention.

FIG. 9 is a schematic diagram for explaining a backwashing apparatus according to Embodiment 6 of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Circulation pump 2 Hair catcher 3 Temperature sensor 4,32,53,63,73 Three-way switching valve 5 Filtration tank 5a Bath water inlet 5b Bath water outlet 6 Filter medium 7 Pressure gauge or pressure sensor 8,10,11 2-way Switching valve 9 Heating means 15, 31a, 31b, 41, 51, 52, 61, 6
2, 71, 72 Jet jet discharge section 16 Air pump 17 Solenoid valve 18 Air supply section 20 Control device 21 Operation panel 22 Air amount adjustment valve 42 Distributing section

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 35/02-35/34 B01D 24/46 B01J 8/00-8/46

Claims (2)

(57) [Claims] 1. A backwashing apparatus for backwashing a filter medium in a filtration tank, wherein the filter medium has a direction orthogonal to or substantially orthogonal to a flowing direction of bath water during normal circulation. A first discharge port for discharging a fluid in a direction in which the filter medium turns spirally or in a direction similar thereto, and the first discharge port. A second discharge port for discharging a fluid in a direction that the filter medium spirally turns in a direction opposite to a spiral direction of the filter medium by the fluid from the discharge port or in a direction similar thereto; A switching unit for switching a direction to be performed to either a direction from the first discharge port or a direction from the second discharge port. 2. The backwashing apparatus according to claim 1, wherein the fluid discharged by the fluid discharging means is a jet jet obtained by mixing water and air.