JPH03291457A - Hot water feeding device - Google Patents

Abstract

PURPOSE:To shorten a hot water feeding time by a method wherein a back-flow preventing device having a surrounding air releasing port is disposed in a hot water feeding circuit, the first opening or closing valve is disposed at the downstream side of it, a hot water feeding circuit is connected to a bath circulation circuit between a water level sensor and a pump and then the second opening or closing valve is disposed between the connection part and the water level sensor. CONSTITUTION:Water from a water supplying pipe 11 passes through a water supplying and heating device 12, a hot water feeding valve 21, a back-flow preventing device 22, the first opening or closing valve 29 and a forward passage 30a under an instruction of hot water feeding of a remote controller 51 and then the water flows into a bath circulation circuit 30. After a predetermined time elapses, the second opening or closing valve 33 is opened and water is also supplied from a back-flow passage 30b. A corresponding amount of water is supplied up to an instructed water level, the hot water feeding valve 21 and the first opening or closing valve 29 are closed and then the supplying of the hot water is stopped. A pump 31 is operated, a water flow is detected by a water flow switch 40, the second opening or closing valve 33 is closed and the water level sensor 34 is lower than the instructed water level, the first opening or closing valve 29 and the hot water feeding valve 21 are opened and then the hot water feeding is started again. At this time, the second opening or closing valve 33 is closed and the back-flow passage 30b are kept to keep the hot water accumulated so as to detect the water level. Upon completion of the control of the hot water feeding, water in the valve chamber 23b and the hopper 2 is recovered to the bath tub B under an operation of the pump 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water filling device for supplying hot water to a bathtub, and particularly to one equipped with a water sensor for detecting the water level in the bathtub.

[Prior Art] As a hot water filling device for filling a bathtub with hot water, for example, as described in the specification of JP-A-2-37226, a hot water supply circuit that supplies hot water from a water heater to a bathtub, Some bathtubs are connected to a bath circulation circuit that circulates hot water in the bathtub using a pump to reheat the bathtub, and hot water is supplied through the bath circulation circuit.

Here, even if the bathtub is installed in a high place such as the second floor, hot water can be supplied using the water pressure of the water supply, and in order to prevent hot water from flowing back from the bathtub, there is an air vent between the two check valves. A backflow prevention device with an opening 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 the three-way valve is used to switch between the hot water supply circuit and the bath circulation circuit for the bathtub.Here, the three-way valve is provided on the discharge side of the pump. It is being

When hot water is supplied, the bath circulation circuit utilizes two flow paths formed in parallel between the three-way valve and the bathtub to reduce flow path resistance, supplying a large amount of hot water in a short time and filling the bath with hot water. Is going.

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

[Problems to be Solved by the Invention] However, in the above method, it is not considered to provide a water level sensor in the bath circulation circuit to detect the water level in the bathtub, It is possible to fill hot water by using the two channels formed at the same time,
For example, if a water level sensor using a semiconductor element that detects pressure is installed in a bath circulation circuit that communicates with the bathtub, the water level sensor is vulnerable to shock, so at least when hot water starts flowing in, the shock from the inflow will affect the water level sensor. In order to prevent this, a water level sensor cannot be provided in the flow path into which hot water from the hot water supply circuit directly flows.

For this reason, as mentioned above, in the case where switching is performed using a three-way valve, it is not possible to provide a water level sensor in the bath circulation circuit, and for example, it is necessary to provide a water channel between the bathtub and the bathtub for water level detection. .

Further, there are backflow prevention devices with different shapes and structures, and in such cases, it is necessary to ensure that water remaining in the backflow prevention device can be recovered to prevent freezing.

However, in the above device, since the three-way valve is provided on the discharge side of the pump, there is a problem in that the water in the backflow prevention device cannot be reliably recovered after filling with hot water.

The present invention provides a hot water filling device in which a backflow prevention device is installed in the hot water supply circuit and a water level sensor is installed in the bath circulation circuit. The purpose is to easily recover water.

[Means for Solving the Problem] The present invention provides a bathtub, a pump for circulating hot water in the bathtub, a water level sensor provided on the suction side of the pump to detect the water level in the bathtub, and a water level sensor provided on the suction side of the pump to detect the water level in the bathtub. In a hot water filling device comprising a bath circulation circuit including a heater provided on the discharge side of a pump, and a hot water supply circuit for supplying hot water to the bathtub via the bath circulation circuit, the hot water supply circuit includes an opening/closing circuit. A backflow prevention device having a possible atmosphere opening and a first opening/closing valve are provided downstream of the backflow prevention device, and the hot water supply circuit is connected to the bath circulation circuit between the water level sensor and the pump. In addition, the technical means is that a second on-off valve is provided between the connection part between the hot water supply circuit and the bath circulation circuit and the water level sensor.

[Operation] In the present invention, when starting to fill the bathtub with hot water from the hot water supply circuit, the second on-off valve is closed and only the first on-off valve is opened.

Therefore, hot water does not flow into the side of the bath circulation circuit where the water level sensor is installed, but flows only into the other side.
Supplied to the bathtub.

After that, when the second on-off valve is opened, hot water also flows into the side where the water level sensor is installed, but in this case, hot water is already supplied to the bathtub from the bath circulation circuit on the side where the water level sensor is not installed. Therefore, the impact caused by hot water flowing into the bath circulation circuit on the water level sensor side is small, and the impact on the water level sensor is small.

The hot water supplied from the hot water supply circuit passes through the two flow paths of the bath circulation circuit that are divided into two in parallel to the bathtub, so the flow path resistance is reduced and a large amount of hot water can be supplied to the bathtub. Can be done. As a result, hot water can be filled in a short time.

Thereafter, by operating the second on-off valve as necessary, the space between the bathtub and the bath circulation circuit on the water level sensor side is filled with warm water, making it possible to detect the water level in the bathtub.

In addition, after filling the hot water, when the first on-off valve is opened in relation to the second on-off valve and the pump is operated, air enters from the atmosphere opening of the backflow prevention device, so the water remaining in the backflow prevention device can be easily collected into the bathtub. [Effects of the Invention] According to the present invention, when hot water flows from the hot water supply circuit to the bath circulation circuit, it can be prevented from flowing into the side where the water level sensor is provided, so that the water level sensor can be protected.

In addition, since the bath circulation circuit has two channels in parallel with the bathtub to reduce channel resistance, the flow rate for filling the bathtub with water increases and the time for filling the bathtub can be shortened.

Furthermore, after filling with hot water, the water in the backflow prevention device can be easily collected into the bathtub.

〔Example〕

Next, the present invention will be explained based on examples.

FIG. 1 shows a gas hot water bath system 1 as a hot 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 heat exchanger 12 that heats water supplied from a water supply pipe 11 connected to a water supply source such as a water supply, and a bath for reheating a bathtub B. It consists of a circulation circuit 30.

The water supply pipe 11 includes a hot water outlet pipe 13 downstream of the hot water supply heat exchanger 12.
A bypass pipe 14 connected to the bypass pipe 1 is connected to the bypass pipe 1
When the bypass solenoid valve 15 provided in the water supply pipe 1 is opened as necessary, the hot water flowing out from the hot water heat exchanger 12 and the water supply pipe 1
The water supplied from 1 is mixed.

The hot water outlet pipe 13 is equipped with a hot water amount servo 16 for regulating the water supplied from the water supply pipe 11, and the hot water outlet pipe 13 branches into two downstream of the hot water amount servo 16, one of which is connected to the hot water supply pipe 17.
The other end is connected to several water supply ports (not shown), and the other end is a connection pipe 18 to the bath circulation circuit 30.

The connecting pipe 18 is provided with a hot water filling valve 21 that opens and closes in response to instructions for filling hot water, and further downstream thereof is a backflow prevention device 2 for preventing backflow of water from the bath circulation circuit 30.
2 is provided.

As shown in FIG. 2, the backflow prevention device 22 has an atmosphere opening 24 formed in a valve chamber 23b in which the valve body 23a of the first check valve 23 is provided, and is provided so as to cover the atmosphere opening 24. The hopper 25 is attached to the first check valve 23, and a second check valve 26 is provided at the outlet of the first check valve 23.

On the other hand, the header 25 includes an external guide pipe 25 that communicates with the outside.
a is provided to protrude into the hopper 25 from the bottom, and a discharge port 25b for discharging water in the hopper 25 is provided at the bottom.
The discharge path 28 merges with the downstream side of the second check valve 26, and the connecting pipe 18 is connected to the bath circulation circuit 30 via the first on-off valve 29 at the circulation branch 30A.

The bath circulation circuit 30 includes a forward pipe 30a through which hot water always passes in the same direction from the circulation branch 30A toward the bathtub B.
A reverse conduit 30b is provided in a closed manner via the bathtub B, in which the direction of passage of hot water is reversed when filling with hot water and when reheating.

In the forward direction pipe line 30a, a pump 31 with a suction part 31a on the side of the connecting pipe 18 and a bath heat exchanger 32 provided in a discharge part 31b of the pump 31 are installed in order toward the bathtub B, and in the reverse direction In the conduit 30b, a second on-off valve 33 and a water level sensor 34 are provided in order toward the bathtub B.

The water level sensor 34 uses a semiconductor diffusion resistance type pressure sensing element that utilizes a piezoresistance effect in which electrical resistance changes according to the strain of a semiconductor single crystal, and has low strength against impact.

In addition, in FIG. 1, 35, 36, 37 are thermistors, 38, 39 are: a quantity sensors, and 40 is a water flow switch.

Each heat exchanger 12.32 also has a blower 41.
．． Burner 43.4 supplied with combustion air by 42
4, and the fuel supply path 43a of the burner 43 is equipped with a governor proportional valve 45 and a small solenoid valve 4 in order to adjust the combustion amount.
6.47 is provided, 48 is the original solenoid valve, 4 is the bath solenoid valve, and 49a is the governor. Each burner 43.44
The device is also equipped with an ignition electrode (not shown) and a flame rod for flame detection.

The gas hot water bath system 1 having the above configuration is controlled by a 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 according to the operation state of the remote control 51 and the detection state of each thermistor, etc., but here, Only the control related to the hot water filling operation will be explained.

The hot water filling valve 21 is instructed to fill with hot water by the remote control 51.
When the water supply circuit 10 opens, the water supplied from the water supply pipe 11 is heated by the hot water supply heat exchanger 12, and the hot water is heated by the hot water filling valve 2.
1. It passes through the backflow prevention device 22 and the first on-off valve 29 and flows into the bath circulation circuit 30.

At this time, the second on-off valve 33 is closed, and hot water is supplied to the bathtub B only from the forward pipe line 30a.

After a predetermined period of time after the hot water filling valve 21 opens, the second on-off valve 33 opens.
When the bathtub B is opened, hot water also flows into the reverse direction pipe 30b,
supplied to

At this time, the hot water from the connecting pipe 18 is transferred to the forward direction pipe 30a.
Since the water is supplied to bathtub B by
Since the inflow pressure to b is much lower than that at the beginning of filling the water, it has little effect on the water level sensor 34.

The amount of water in bathtub B corresponds to the water level instructed by the remote control 51.
When hot water is supplied to the inside, the hot water filling valve 21 is closed and the supply of hot water is temporarily stopped, and at this time, the first on-off valve 29 is also closed.

Thereafter, the pump 31 is driven, and control is performed to determine whether or not there is hot water in the bathtub B.

If you forget to close the faucet in bathtub B, the water flow is detected by the water flow switch 40 when the pump 31 is activated, and then the second on-off valve 33 is closed to ensure that the water level detected by the water level sensor 34 is at the specified water level. It is determined whether or not.

If the water level is less than the specified water level, the first on-off valve 29 is opened, and the hot water filling valve 21 is opened again to restart hot water filling.

At this time, hot water is supplied only from the forward direction pipe 30a, the second on-off valve 33 remains closed, and hot water is not supplied from the reverse direction pipe 30b.
b remains filled with hot water for water level detection.

When the water level detected by the water level sensor 34 reaches the instructed water level, the hot water filling valve 21 is closed and the hot water filling control is completed.

After completing the hot water filling control, the pump 31 is operated to recover the water remaining in the backflow prevention device 22.

At this time, when the solenoid valve 27 is closed, the water in the valve chamber 23b is recovered via the second check valve 26, and after a predetermined time (several seconds), when the solenoid valve 27 is opened, the water inside the hopper 25 is recovered. water is collected and sent to bathtub B.

When the recovery of the water in the backflow prevention device 22 is completed, the first on-off valve 29 is closed, and then heat retention control is performed.

As described above, in the present invention, when filling hot water, the hot water supplied from the hot water supply circuit 10 to the bath circulation circuit 30 is first supplied to the bathtub B only from the forward direction pipe 30a without the water level sensor 34, and then Since the hot water is supplied to the reverse pipe 30b, no impact is applied to the water level sensor 34 when hot water flows into the bath circulation circuit 30, and once the hot water starts to be supplied, the forward pipe 30a Since the water passes through two conduits, ie, the reverse conduit 30b, the flow resistance is reduced, the flow rate can be increased, and the filling time can be shortened.

Furthermore, after filling the water with water, the water in the backflow prevention device 22 can be reliably recovered.

In this embodiment, the hopper of the backflow prevention device is equipped with a solenoid valve, but the hopper may be equipped with a check valve instead of the solenoid valve.

[Brief explanation of the drawing]

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 diagram, 1... gas bath hot water supply system (hot water filling device),
10... Hot water supply circuit, 22... Backflow prevention device, 24...
・Atmospheric release port, 29...first on-off valve (first on-off valve)
, 30... Bath circulation circuit, 31... Pump, 32...
... Bath heat exchanger (heater), 33... Second on-off valve (second on-off valve), 34... Water level sensor, B... Bathtub. Attorney Kenji Ishiguro Diagram 2 Procedural Amendment (Hou) Display of the case 1990 Patent Application No. 89561 Relationship with the case of the person amending the name of the invention Hot water filling device Patent applicant address Fukuzumi-cho, Nakayo-ku, Nagoya City No.2 No. 26 Name Susumu Naito, Representative of Rinnai Corporation

Claims (1)

[Claims] 1) A bathtub, a pump for circulating hot water in the bathtub,
A bath circulation circuit including a water level sensor provided on the suction side of the pump to detect the water level of the bathtub, and a heater provided on the discharge side of the pump, and hot water supplied to the bathtub via the bath circulation circuit. In a hot water filling device comprising a hot water supply circuit for supplying hot water, the hot water supply circuit is provided with a backflow prevention device having an openable and closable atmosphere opening, and a first on-off valve downstream of the backflow prevention device. , the hot water supply circuit is connected to the bath circulation circuit between the water level sensor and the pump, and a second on-off valve is provided between the connection between the hot water supply circuit and the bath circulation circuit and the water level sensor. A hot water filling device characterized by being provided with.