JPH0735924B2 - Hot water filling device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water filling device for supplying hot water to a bathtub, and in particular,
The present invention relates to an apparatus provided with a backflow prevention device for preventing backflow from a bathtub when the bathtub is installed at a high place such as the second floor of a house.

[Prior Art] As a hot water filling device for hot water filling a bathtub, for example, as described in the specification of JP-A-2-37226,
There is one that connects a hot water supply circuit that supplies hot water from a water heater to a bathtub to a bath circulation circuit that circulates hot water in the bathtub by a pump for additional heating, and supplies hot water through the bath circulation circuit. .

Here, even when the bathtub is installed at a high place such as the second floor, the water pressure of the water supply can be used to supply hot water, and the atmosphere is opened between the two check valves to prevent backflow of hot water from the bathtub. A backflow prevention device having a mouth is provided in the hot water supply circuit.

In addition, a three-way valve is provided at the connection between the hot water supply circuit and the bath circulation circuit, and switching between the hot water supply circuit and the bath circulation circuit for the bathtub is performed using the three-way valve, where the three-way valve is provided on the discharge side of the pump. Has been.

In addition, a float valve is provided at the atmosphere opening port of the backflow prevention device, and the float valve is connected to the suction side of the pump of the bath circulation circuit in order to collect the water that flows out from the atmosphere opening port and collects in the float valve. ing.

[Problems to be Solved by the Invention] However, there are some backflow prevention devices having different shapes and structures, and for each of them, not only the water in the float valve but also the backflow prevention device remains to prevent freezing. It is also necessary to ensure that water can be recovered.

On the other hand, in the above-mentioned one, since the three-way valve is provided on the discharge side of the pump, there is a problem that the water in the backflow prevention device cannot be reliably recovered after the filling of water is completed.

It is an object of the present invention to easily collect water in a backflow prevention device in a water filling device in which a hot water supply circuit is provided with a backflow prevention device and the hot water supply circuit is connected to a bath circulation circuit.

[Means for Solving the Problems] The present invention provides a bathtub, a pump for circulating hot and cold water in the bathtub, a bath circulation circuit including a heater provided on the discharge side of the pump, and the bath circulation circuit. Water filling provided with a hot water supply circuit connected between the bathtub and the suction side of the pump for supplying hot water to the bathtub, the hot water supply circuit having a hot water filling valve that is controlled to open and close according to a hot water filling instruction. In the device, an upstream check valve, a downstream check valve provided in series with the upstream check valve via a side passage communicating with the valve chamber of the upstream check valve, and the upstream check valve. In the hot water supply circuit, a backflow prevention device is provided at the bottom of the valve chamber in which the valve body is arranged, and the backflow prevention device includes an atmosphere opening port that is reversibly opened and closed with the upstream check valve by a valve unit that interlocks with the valve body. Suction of the pump is provided at the connection between the bath circulation circuit and the hot water supply circuit. A three-way valve having three ports for switching a pipe communicating with the side is provided, the hot water supply circuit and the bath circulation circuit are connected via the three-way valve, and in the filling operation, the suction side of the pump supplies the hot water. The three-way valve is driven so as to communicate with both the circuit and the bath circulation circuit, and after the closing operation of the water filling valve at the end of the water filling operation, the suction side of the pump communicates only with the hot water supply circuit. It is a technical means to provide a control means for operating the pump after driving the three-way valve.

[Operation] In the present invention, when hot water filling is performed, the hot water supply circuit and the bath circulation circuit are connected by the three-way valve.

The hot water supply circuit is provided with a backflow prevention device having an openable atmosphere opening between two check valves, and when hot water is supplied from the hot water supply circuit, the valve bodies of the respective check valves open and It is supplied to the bath circulation circuit via a valve.

On the other hand, since the three-way valve has three ports, two pipes are formed between the three-way valve and the bath by the bath circulation circuit, and the hot water supplied from the hot water supply circuit is divided into two parallel to the bath. It will pass through two flow paths in the bath circulation circuit.
Therefore, the flow path resistance is reduced, and a large amount of hot water can be supplied to the bath. As a result, it is possible to fill water in a short time.

When the supply of hot water from the hot water supply circuit is stopped, each check valve of the backflow prevention device closes the valve body.

After that, when the pump of the bath circulation circuit is operated while the hot water supply circuit and the bath circulation circuit are in communication, the hot water supply circuit is connected to the suction side of the pump through the three-way valve, so the pump operates in the backflow prevention device. Accordingly, the check valve on the downstream side is opened, and the outside air flows in from the atmosphere opening port and the water remaining in the backflow prevention device is sucked out by the pump.

In the case of additional heating, when the pump is operated by removing the communication between the hot water supply circuit and the bath circulation circuit by the three-way valve, the hot water in the bath circulates in the bath circulation circuit.

[Effect of the Invention] In the present invention, since the hot water supply circuit and the bath circulation circuit are connected via the three-way valve having three ports, the bath circulation circuit is formed as two flow passages in parallel with the bathtub. Since the resistance can be reduced, the flow rate of the filling is increased and the filling time can be shortened.

Further, since the hot water supply circuit is connected to the suction side of the pump via the three-way valve, the water in the backflow prevention device can be easily collected into the bathtub by using the suction force of the pump after the water filling is completed. .

As a result, it is possible to prevent a problem in which the water in the backflow prevention device freezes and the valve sticks, which prevents hot water from being supplied to the bathtub.

EXAMPLES Next, the present invention will be described based on examples.

FIG. 1 shows a gas hot water bath system 1 as a water filling device of the present invention.

The gas hot water bath system 1 includes a hot water supply circuit 10 having a hot water supply heat exchanger 12 for heating water supplied from a water supply pipe 11 connected to a water supply source such as water supply, and a bath for reheating a bath B. It consists of a circulation circuit 30.

The water supply pipe 11 is connected to a bypass pipe 14 connected to a hot water supply pipe 13 downstream of the hot water heat exchanger 12, and when a bypass solenoid valve 15 provided in the bypass pipe 14 is opened as needed, the hot water supply heat The warm water flowing out of the exchanger 12 and the water supplied from the water supply pipe 11 are mixed.

The hot water supply pipe 13 is provided with a hot water amount servo 16 for adjusting the water supplied from the water supply pipe 11.
It is branched into two downstream, one is connected to several hot water supply ports (not shown) as a hot water supply pipe 17, and the other is connected to the bath circulation circuit 30.
It is a water filling pipe 18 to.

The water filling pipe 18 is provided with a water filling valve 21 that opens and closes in response to a water filling instruction, and further downstream thereof, a bath circulation circuit.
A backflow prevention device 22 is provided to prevent backflow of water from 30.

As shown in FIG. 2, the check valve 22 includes a first check valve 23.
Atmosphere opening 24 is formed in a valve chamber 23b in which the valve body 23a is provided, and a hopper 25 provided so as to cover the atmosphere opening 24
Is attached to the first check valve 23, and a second check valve 26 is provided at the outflow portion of the first check valve 23.

On the other hand, in the hopper 25, an external guide pipe 25a communicating with the outside is provided so as to project from the bottom into the hopper 25, a discharge port 25b for discharging the water in the hopper 25 is provided at the bottom, and the discharge port 25b is A discharge passage 28 is provided via the solenoid valve 27, the discharge passage 28 merges with the downstream side of the second check valve 26, and is connected to the bath circulation circuit 30 via a three-way valve 29.

In the bath circulation circuit 30, a forward pipe line 30a through which hot water always passes in the same direction and a reverse pipe line 30b in which the hot water passage direction is opposite between the time of filling the water and the time of reheating the water through the bathtub B. The forward pipe 30a and the reverse pipe 30b are provided in a closed shape, and the three-way valve 29
Respectively connected to.

The three-way valve 29 is provided with a T-shaped three-port valve body 29a, and the valve body 29a is driven by a motor (not shown).

A pump 31 having a suction portion 31a on the side of the filling pipe 18 and a bath heat exchanger 32 provided on the side of the discharge portion 31b of the pump 31 are sequentially provided in the forward direction pipeline 30a toward the bath B. Directional conduit
30b is connected to bathtub B.

In FIG. 1, 35, 36, 37 are thermistors, 38,
Reference numeral 39 is a flow sensor, and 40 is a water flow switch.

Further, each heat exchanger 12, 32 is provided with burners 43, 44 to which combustion air is supplied by blowers 41, 42, respectively, and a fuel supply passage 43a of the burner 43 is provided for adjusting the combustion amount. A governor proportional valve 45 and small solenoid valves 46 and 47 are provided, 48 is a former solenoid valve, 49 is a bath solenoid valve, and 49a is a governor. Each of the burners 43, 44 is additionally provided with an ignition electrode (not shown) and a frame rod for flame detection.

The gas hot water bath system 1 having the above configuration is controlled by the control device 50.

The control device 50 controls the combustion state of each burner 43, 44 and each circuit of the hot water supply circuit 10 and the bath circulation circuit 30 in accordance with the operation state of the remote controller 51 and the detection state of each thermistor, etc., but here, Only the control relating to the filling operation will be described.

When the target amount of filling water is set by the remote controller 51 and filling is instructed, the three-way valve 29 causes the filling pipe 18 to communicate with the forward direction pipeline 30a and the reverse direction pipeline 30b, and the filling valve is filled. Open 21

In the hot water supply circuit 10, the water supplied from the water supply pipe 11 is heated by the hot water supply heat exchanger 12, and the hot water is filled with the hot water valve 21 and the backflow prevention device 22.
And it passes through the three-way valve 29 and flows into the bath circulation circuit 30.

At this time, in the backflow prevention device 22, the electromagnetic valve 27 is closed, and a part of the inflowing warm water is discharged from the atmosphere opening port 24 to the hopper 25.
Flows out to and accumulates in the hopper 25.

Further, in the bath circulation circuit 30, the warm water is supplied to the bathtub B by being divided into the forward pipe line 30a and the backward pipe line 30b. Therefore, the resistance of the conduit is reduced, and a large amount of hot water can be supplied.

When the integrated value of the flow rate detected by the flow rate sensor 39 reaches the target amount of water filling, the water filling valve 21 is closed and the water filling is completed.

After that, the three-way valve 29 is used for the filling pipe 18 and the forward pipe line 30a.
When only the pump 31 is in communication and the pump 31 is driven, the backflow prevention device
Water remaining in the valve chamber 23b upstream of the second check valve 26 of 22 is sucked out by opening the second check valve 26 by the suction force of the pump 31.

Also, a few seconds after the driving of the pump 31 is started (for example, 2 seconds)
Then, when the solenoid valve 27 is opened, the water in the hopper 25 is sucked out and sent to the bath B.

When the water in the backflow prevention device 22 is collected, the three-way valve 29
The connection between the water filling pipe 18 and the bath circulation circuit 30 is cut off, the forward direction pipeline 30a and the reverse direction pipeline 30b are communicated, and the heat retention control is started.

As described above, in the present invention, when filling the hot water, the hot water supplied from the hot water supply circuit 10 to the bath circulation circuit 30 is supplied to the bathtub B from the forward direction pipeline 30a and the reverse direction pipeline 30b.
The flow path resistance is reduced, the flow rate can be increased, and the filling time can be shortened.

Further, after the filling of water is completed, the water in the backflow prevention device 22 can be reliably recovered by using the suction force of the pump 31.

Therefore, the water filling can be performed without being affected by freezing.

Further, since the hot water supply circuit 10 and the bath circulation circuit 30 are connected via the three-way valve 29, the structure is simple and the cost is low.

In the present embodiment, the hopper 25 of the backflow prevention device 22 is provided with the solenoid valve 27, but a check valve may be provided instead of the solenoid valve.

Although the water level sensor for detecting the water level in the bathtub B is not provided in the present embodiment, a water level sensor may be provided between the three-way valve 29 and the bathtub in the reverse direction pipeline 30b.

In that case, the water level sensor, using a semiconductor diffusion resistance type pressure sensing element utilizing the piezoresistive effect that changes the electrical resistance according to the strain of the semiconductor single crystal, is communicated with the reverse direction conduit 30b, After pumping the warm water in the bathtub B by the pump 31, the communication between the reverse direction pipeline 30b and the forward direction pipeline 30a is cut off to detect the water level.

Further, in order to protect the water level sensor, at the beginning of the filling process, the filling pipe 18 and the forward direction pipeline 30a are communicated with each other, and the bathtub B
On the other hand, after the bath circulation circuit 30 is filled with water only from one side, the water filling pipe 18 and the forward direction pipeline 30a and the reverse direction pipeline 30b may be switched so as to communicate with each other.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of a gas hot water bath system showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a backflow prevention device in the gas hot water bath system of the present embodiment. In the figure, 1 ... Gas bath hot water supply system (water filling device), 18
...... Hot water filling pipe (hot water supply circuit), 19 ...... Hot water filling valve, 22 ...... Backflow prevention device, 23 ...... First check valve (upstream side check valve), 23a
...... Valve, 23b ...... Valve chamber, 24 ...... Air release port, 26 ...... Second check valve (downstream check valve), 29 ...... Three-way valve, 30 ...... Bath circulation circuit, 31 ...... Pump, 31a ... Suction part (suction side), 3
1b: Discharge unit (discharge side), 32: Bath heat exchanger (heater), 50: Control device (control means), B: Bathtub.

Claims (1)

[Claims] 1. A bath tub, a pump for circulating hot and cold water in the bath, a bath circulation circuit including a heater provided on the discharge side of the pump, and a suction side of the bath and the pump of the bath circulation circuit. And a hot water supply circuit connected between the hot water supply circuit and the hot water supply circuit for supplying hot water to the bathtub, and the hot water supply circuit includes a hot water filling valve that is controlled to open and close according to a hot water filling instruction. A stop valve, a downstream check valve provided in series with the upstream check valve via a side passage communicating with the valve chamber of the upstream check valve, and a valve element of the upstream check valve are arranged. A backflow prevention device is provided in the hot water supply circuit, the backflow prevention device having an atmosphere opening formed at the bottom of the valve chamber and reversibly opened / closed with the upstream check valve by a valve unit interlocking with the valve body. A pipe line communicating with the suction side of the pump is provided at the connection portion between the circuit and the hot water supply circuit. A three-way valve having three ports for replacement is provided, the hot water supply circuit and the bath circulation circuit are connected via the three-way valve, and the suction side of the pump is the hot water supply circuit and the bath circulation circuit in the filling operation. The three-way valve was driven so as to communicate with both, and after the closing operation of the water filling valve at the end of the water filling operation, the three-way valve was driven so that the suction side of the pump communicates only with the hot water supply circuit. A hot water filling device, characterized in that a control means for operating the pump later is provided.