JPH0428383B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a filtration device.

(Prior art and problems) The applicant previously filed a patent application for a bathtub water filtration device.
- As shown in Specification No. 197216, only during the first filtration operation after the bathtub has been drained and water has been newly supplied, a backwash operation is performed for a certain period of time prior to the filtration operation, and the filtration He invented something that prevents bad odors from coming from inside the tank.

However, in this system, backwashing was performed using bathtub water, so even if the bathtub was initially filled with water to an appropriate height, water would be drained out of the system after the backwashing operation. The water level dropped, which was unfavorable.

In addition, backwashing was performed prior to the filtration operation only after the bathtub had been drained and new water was supplied, so it was possible to take a bath on the second day without draining the bathtub water from the previous day. In such cases, backwashing was not performed, and a bad odor wafted into the bathtub as soon as the filtration operation started.

The present invention aims to solve the above-mentioned problems of the prior art.The water level in the bathtub does not drop even when backwashing is performed, and furthermore, it is possible to take a bath without draining the bathtub water from the previous day. To provide a bathtub water filtration device that does not give off a bad odor even when performing a filtration operation.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a filtration device equipped with an automatic hot water reheating device according to the present invention. In Fig. 1, 1 is a bathtub;
2 is a circulation circuit for circulating hot water in the bathtub 1, and the circulation circuit 2 is provided with a pump 5 for forcibly circulating the hot water. The flow path on the discharge side of the pump 5 is divided into a back side flow path 33 and a foot side flow path 34, and a foam ejector 35 is provided at the end of each flow path, that is, at the bathtub discharge portion. And each flow path 33,
Flow rate control valves 31 and 32 are interposed in each of the flow rate control valves 34 .

4 is a reheating circuit branched from the pump 5 discharge side of the circulation circuit 2, which is used for a bath heat exchanger 6 for heating hot water, a pressure sensor 7 for detecting the water level in the bathtub 1, and for determining circulation, etc. A water flow switch 8, a thermistor 9 for detecting the temperature of hot water in the bathtub 1, and a self-priming pump 21 for flowing hot water into the reheating circuit 4 are provided. The reheating circuit 4 is the circulation circuit 2.
The dorsal side flow path 33 and foot side flow path 34 are branched and connected to the upstream and downstream sides of the flow control valve 31 provided in each of the dorsal side flow path 33 and foot side flow path 34, and a three-way valve (3
8) is provided.

3 is a hot water supply circuit for dropping hot water into the bathtub 1, and the hot water supply circuit 3 is connected to the bathtub 1 via a reheating circuit 4. The hot water supply circuit 3 is connected to the reheating circuit 2 from the water supply via the hot water supply heat exchanger 10, and a hot water supply branch circuit 11 is branched from the downstream side of the hot water supply heat exchanger 10 of the hot water supply circuit 3. There is. This hot water supply branch circuit 11 is connected to a shower, a shower, etc., and supplies hot water to these devices. Upstream of the hot water heat exchanger 10 in the hot water supply circuit 3, an incoming water flow rate sensor 12 for detecting the incoming water flow rate from the water supply and a thermistor 13 for detecting water temperature are provided.
Between the hot water supply branch circuit 11 and the hot water supply branch circuit 11, there is provided a flow rate adjustment valve 14 for adjusting the flow rate of incoming water, and a heat exchanger 10 for hot water supply.
A thermistor 15 is provided to detect the temperature of the hot water. Furthermore, on the downstream side of the hot water supply branch circuit 11, there is a dropping flow rate sensor 17 for detecting the dropping flow rate into the bathtub 1, and a vacuum breaker 1.
8. A drop-in opening/closing valve 19 and a check valve 20 for opening and closing the hot water supply circuit 3 are provided. 16
is a three-way valve provided in the hot water supply circuit 3 downstream of the check valve 20, and branches a backwash circuit 30 connected to a filtration tank, which will be described later.

23 is a filtration circuit that branches from the pump 5 discharge side of the circulation circuit 2 and is connected to the pump 5 suction side, and a filtration tank 22 is interposed in the middle. A backwash drainage circuit 24 is branched from a location upstream of the filtration tank 22 via a three-way valve 26.
The backwash circuit 30 is connected to a location on the downstream side of the filtration tank 22 via a three-way valve 25. 2
Reference numeral 9 denotes an air bleed valve provided in the filtration tank 22, which bleeds out the air inside the filtration tank 22 when it is filled with water.

The backwash circuit 30 is directly connected to the water supply through the hot water supply circuit 3 and the three-way valve 16, and is provided with a constant flow governor 27 and an air separator 28.

Reference numeral 36 denotes an air supply pipe connected to each foam ejector 35, the flow rate of which is controlled by an air amount control valve 37.

The automatic hot water reheating device is provided with an operating device (not shown), and the operating device includes an operation switch, a bubble air operation switch, a backwash switch, and the like.

Regarding the backwashing operation of the filtration device equipped with the above-mentioned automatic hot water reheating device, a description will be given of the operation when the backwashing operation is performed in conjunction with the bubble bath operation. When the bubble bath operation switch is pressed for the first time after the operation switch is turned ON, the circulation pump 5 is activated and the three-way valve 25 is activated.
is controlled so that the backwash circuit 30 side and the filtration tank 22 side communicate with each other, and the three-way valve 26 is controlled so that the filtration tank 22 side and the backwash drainage circuit 24 communicate with each other. Further, the three-way valve 16 communicates the hot water supply circuit 3 with the backwash circuit 30, and the drop-in opening/closing valve 19 is controlled to open, so that backwashing is performed for a predetermined period of time (for example, 0.5 minutes). At this time, the air amount control valve 37 of the air supply pipe 36 connected to the bubble ejector 35 is simultaneously opened, and air bubbles are mixed into the jet stream discharged into the bathtub 1, resulting in a bubble bath.

Thereafter, the three-way valve 25 is controlled to communicate between the filtration tank 22 side and the pump suction side of the circulation circuit 2, and the three-way valve 26 is controlled to close in the direction of the backwash drainage circuit 24, so that the filtration An action is taken. However, at this time, it is still in a bubble bath state, and the hot water is sucked from the bathtub 1 into the circulation circuit 2.
The water is divided into one that flows to the filtration circuit 23 and one that is discharged into the bathtub 1. The hot water flowing into the filtration circuit 23 passes through the filtration tank 22 and returns to the pump 5 suction side of the circulation circuit 2 again after fine dirt such as scales in the bath water is removed. Therefore, the bad odor inside the filter tank 22 is removed by the above-mentioned backwashing operation, and the bad odor does not drift away.

After the filtration operation is performed for a predetermined period of time (for example, 5 minutes), the backwash operation is performed again for a certain period of time (for example, 2 minutes), and the bubble bath operation switch is turned on.
Until the bath is turned off, the filtering operation and the backwashing operation are performed alternately as described above, and the interior of the bathtub 1 is always a bubble bath.

Incidentally, after the operation switch is turned ON, the filtration operation may be started from the second bubble bath operation.

Therefore, as mentioned above, the operation switch of the controller
After the ON operation, during the first bubble bath operation, the hot water supplied from the hot water supply circuit performs a backwash operation prior to the filtration operation, so even if you take a bath on the second day without draining the bathtub water from the previous day, the bubbles will bubble. You no longer have to worry about bad smells while taking a bath. Further, even when backwashing is performed, the water level in the bathtub 1 does not decrease.

In addition, although the case where the said backwashing operation was related to the dropping operation and the bubble bath operation was explained, it is also possible to operate only the backwashing operation independently.
In addition, when the backwashing operation is performed independently, it is preferable to provide a timer such as a timer (not shown) to automatically stop the backwashing operation after a predetermined period of time, since this saves the trouble of waiting.

(Effects of the Invention) As is clear from the above embodiments, the present invention provides a foam ejector in the bathtub discharge part of a circulation circuit for circulating hot water in a bathtub, connects a filtration circuit having a filtration tank to the circulation circuit, A backwash drainage circuit is branched from the filtration circuit upstream of the filtration tank, and a backwash circuit directly connected to the water supply is merged downstream of the filtration tank, and during backwashing, backwash water is filtered from the backwash circuit. In a device that reverses the flow through the tank, flows into the backwash drainage circuit, and also filters during bubble bath operation, it is configured so that backwash is performed for a certain period of time prior to filtration during bubble bath operation.
Even when backwashing is performed, the water level in the bathtub does not drop, and even if the bathtub water from the previous day is taken a bath without being drained and filtered, there is no foul odor.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a filtration device with additional heating for hot water according to an embodiment of the present invention, and FIG. 2 is a time chart. 1... Bathtub, 2... Circulation circuit, 3... Hot water supply circuit, 22... Filtration tank, 23... Filtration circuit, 24...
...Backwash drain circuit, 30...Backwash circuit, 35...
Foam ejector (tub outlet).

Claims (1)

[Claims] 1. A foam ejector is provided at the bathtub discharge part of a circulation circuit that circulates hot water in the bathtub, a filtration circuit having a filtration tank is connected to the circulation circuit, and a backwash drainage circuit is connected from the filtration circuit upstream of the filtration tank. It branches out and joins a backwash circuit directly connected to the water supply on the downstream side of the filtration tank.
During backwashing, backwash water flows back through the filtration tank from the backwash circuit, flows into the backwash drainage circuit, and is also filtered during bubble bath operation. A filtration device characterized in that it is configured to perform the following operations.