JPH0814425B2 - Hot water filling equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water filling device for supplying hot water to a bath, and more particularly to a device provided with a water level sensor for detecting the water level in the bath.

[Prior Art] As a hot water filling device for performing hot water filling to a bathtub, for example, as described in the specification of JP-A-2-37226, a hot water supply circuit for supplying hot water from a hot water supply device to a bathtub, There is one that is connected to a bath circulation circuit in which hot water in a bathtub is circulated by a pump for reheating, 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,
A hot water supply circuit is provided with a backflow prevention device that can supply hot water using the water pressure of the water supply and that has an atmosphere opening port provided between two check valves to prevent backflow of hot water from the bathtub.

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.

When hot water is supplied, the flow path resistance is reduced by utilizing two flow paths formed in parallel between the three-way valve and the bath in the bath circulation circuit, and a large amount of hot water is supplied in a short time to fill the water. Is going.

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, in the above, since it is not considered to provide a water level sensor for detecting the water level of the bathtub in the bath circulation circuit, the three-way valve and the bathtub are connected in parallel. Although it is possible to perform hot water filling using the two flow paths formed at the same time, for example, when a water level sensor using a semiconductor element that detects pressure is provided in a bath circulation circuit that communicates with a bath,
Since the water level sensor is vulnerable to shocks, a water level sensor should be installed in the flow path where hot water from the hot water supply circuit directly flows in to prevent the water level sensor from being subjected to shocks at the time of inflow at least when hot water starts to flow. Can not.

Therefore, as described above, in the case where the switching is performed using the three-way valve, the water level sensor cannot be provided in the bath circulation circuit, and for example, it is necessary to provide a water channel for water level detection with the bathtub. .

Some backflow prevention devices have different shapes and structures. In this case, it is necessary to reliably collect water remaining in the backflow prevention device to prevent freezing.

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

The present invention is provided with a backflow prevention device in the hot water supply circuit, in a water filling device provided with a water level sensor in the bath circulation circuit, while shortening the water filling time while protecting the water level sensor,
The purpose is to easily collect water in the backflow prevention device at the end of filling.

[Means for Solving the Problems] The present invention provides a bathtub, a pump for circulating hot and cold water in the bathtub, a water level sensor provided on the suction side of the pump for detecting the water level of the bathtub, and the pump. In a hot water supply circuit for supplying hot water to the bathtub through the bath circulation circuit, which includes a heater provided on the discharge side of the hot water supply circuit. A backflow prevention device having a water filling valve for controlling the supply, an atmosphere opening port that is closed when the hot water is supplied from the hot water supply circuit and opened when the hot water is stopped, and a first opening / closing device downstream of the backflow prevention device. A valve is provided, the hot water supply circuit is connected to the bath circulation circuit between the water level sensor and the pump, and between the connection between the hot water supply circuit and the bath circulation circuit and the water level sensor. Second opening and closing A valve is provided, and the hot water supply circuit is a water filling start control means for supplying hot water to the bathtub by the water pressure of a water supply source such as water supply by the opening operation of the water filling valve and the first on-off valve, A parallel filling control means for opening the second on-off valve after the opening of the filling valve to perform filling with the bath circulation circuit as a parallel supply path, and after filling by the parallel filling control means Water level detection control means for closing the second on-off valve to detect the water level in the bathtub, and closing the water filling valve based on water level detection by the water level detection control means The provision of the control means is a technical means.

The invention of claim 2 is the end of the filling control,
The technical means is provided with hot water recovery control means for operating the pump to recover hot water in the backflow prevention device after closing the second on-off valve.

[Operation] In the present invention, when starting to fill the hot water from the hot water supply circuit to the bathtub, the second opening / closing valve is closed and only the first opening / closing valve is opened.

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

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

The hot water supplied from the hot water supply circuit will pass through the two flow paths of the bath circulation circuit that are divided into two parts in parallel with the bathtub, so the flow path resistance will be small and a large amount of hot water will be supplied to the bathtub. You can As a result, it is possible to fill water in a short time.

After that, if the second opening / closing valve is closed as needed, the water level in the bathtub can be detected because the space between the bathtub and the bath circulation circuit on the water level sensor side is filled with warm water.

Further, after the completion of the filling with water, the second on-off valve is closed and the first
When the on-off valve is opened and the pump is operated, air enters from the atmosphere opening port of the backflow prevention device, so that the water remaining in the backflow prevention device can be easily collected in the bath.

[Effects of the Invention] In 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 the water level sensor can be protected.

Further, since the bath circulation circuit is formed in parallel with the bathtub by using two flow passages, the flow passage resistance can be reduced, so that the filling water flow rate increases and the filling time can be shortened.

Further, after the filling with water, the water in the backflow prevention device can be easily collected in 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, and the hot water discharge pipe 13 is a hot water amount servo.
It is branched into two in the downstream of 16, one is connected to several hot water supply ports (not shown) as a hot water supply pipe 17, and the other is a bath circulation circuit.
It is a connecting pipe 18 to 30.

The connection pipe 18 is provided with a water filling valve 21 that opens and closes in accordance with 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.
A hopper provided with an atmosphere opening port 24 formed in a valve chamber 23b provided with a valve body 23a of 23 and covering the atmosphere opening port 24.
25 is provided side by side with 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, the hopper 25 has an external guide tube 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 provided with a discharge path 28 via a solenoid valve 27. The passage 28 joins with the downstream side of the second check valve 26, and the connecting pipe 18 is connected to the bath circulation circuit 30 and the circulation branch portion 30A via the first opening / closing valve 29.
Connected by.

The bath circulation circuit 30 includes a forward pipe line 30a through which warm water always passes in the same direction from the circulation branch portion 30A toward the bathtub B,
A reverse direction pipe line 30b, in which the hot water passage direction is opposite between the hot water filling time and the hot water heating time, is provided in a closed state via the bathtub B.

In the forward direction pipe line 30a, a pump 31 serving as a suction part 31a on the connection pipe 18 side and a bath heat exchanger 32 provided on the discharge part 31b side of the pump 31 are sequentially provided toward the bath B, and in the reverse direction. Pipeline
A second opening / closing valve 33 and a water level sensor 34 are sequentially provided to the bathtub B at 30b.

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

In FIG. 1, 35, 36 and 37 are thermistors and 3
8 and 39 are flow rate sensors, and 40 is a water flow switch.

Further, the heat exchangers 12 and 32 are provided with blowers 41 and 42, respectively.
Burners 43, 44 to which combustion air is supplied are provided, and the fuel supply passage 43a of the burner 43 is provided with a governor proportional valve 45 and small solenoid valves 46, 47 for adjusting the combustion amount. , 48 is a former solenoid valve, 49 is a Zhang 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 water filling is instructed by the remote controller 51 and the water filling valve 21 is opened, 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 hot water is filled with the water filling valve 21 and the backflow prevention. Bath circulation circuit 30 passing through the device 22 and the first on-off valve 29
Flow into.

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

When the second opening / closing valve 33 is opened a predetermined time after the hot water filling valve 21 is opened, the hot water also flows into the reverse direction pipeline 30b and is supplied to the bathtub B.

At this time, since the hot water from the connecting pipe 18 is supplied to the bathtub B by the forward pipe line 30a, the inflow pressure into the reverse pipe line 30b is much smaller than that at the beginning of the filling, so that the water level sensor The impact on 34 is small.

The amount of water corresponding to the water level indicated by the remote control 51 is the bathtub B.
When the water is supplied inside, the water filling valve 21 is closed and the supply of hot water is once stopped, and at this time, the first opening / closing valve 29 is also closed.

After that, the pump 31 is driven, and the control for determining whether or not there is warm water in the bathtub B is performed.

If the user does not forget to close the plug of the bathtub B, the water flow is detected by the water flow switch 40 when the pump 31 is operated, and then the second opening / closing valve 33 is closed and the water level detected by the water level sensor 34 is instructed. It is determined whether or not.

When the water level is less than the instructed water level, the first on-off valve 29 is opened, the water filling valve 21 is opened again, and the water filling is restarted.

At this time, hot water is supplied only from the forward direction pipeline 30a, the second opening / closing valve 33 remains closed, and the reverse direction pipeline 30a remains.
Hot water is not supplied from 30b, and the backward pipe 30b is still 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 water filling valve 21 is closed and the water filling control ends.

After the filling control is completed, the pump 31 operates to collect 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 collected through the second check valve 26, and the water is collected for a predetermined time (several seconds).
After that, with the solenoid valve 27 opened, the water in the hopper 25 is collected and sent into the bath B, respectively.

When the water in the backflow prevention device 22 is collected, the first on-off valve
After 29 is closed, heat retention control is performed.

As described above, in the present invention, when performing hot water filling, the hot water supplied from the hot water supply circuit 10 to the bath circulation circuit 30 is initially
Since the water is supplied to the bathtub B only from the forward conduit 30a without the water level sensor 34 and then supplied to the reverse conduit 30b, the water level sensor 34 may be impacted when the hot water flows into the bath circulation circuit 30. Moreover, once the supply of hot water starts, it passes through the two pipes of the forward pipe line 30a and the reverse pipe line 30b, so the flow passage resistance is reduced and the flow rate can be increased. The tensioning time can be shortened.

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

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

[Brief description of 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), 10
...... Hot water supply circuit, 22 ...... Backflow prevention device, 24 ...... Air opening, 29 ...... First opening / closing valve (first opening / closing valve), 30 ...... Bath circulation circuit, 31 ...... Pump, 32 ...... Bath Heat exchanger (heater), 33 ... Second opening / closing valve (second opening / closing valve), 34 ... Water level sensor, B ... Bathtub.

Front page continued (72) Inventor Toshinori Ozawa 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Linnai Co., Ltd. (72) Inventor Sadao Okada 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture In-house (72) Inventor Shuji Ito 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture Linnai Co., Ltd. (72) Hidehiko Takagi 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya City, Aichi Prefecture (72) Naoto Nomura, No. 26 Fukuzumicho, Nakagawa-ku, Nagoya-shi, Aichi Prefecture, 26-2 Linnai Co., Ltd. (72) Masaru Shimazaki, No. 26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi Prefecture 72) Inventor Tadashi Nakajima 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture Rinnai Co., Ltd. (56) References JP-A-60-202255 (JP, A) JP-A-2-219951 (JP, A) JP-A-3-204558 (JP, A) JP-A-2-82054 (JP, A)

Claims (2)

[Claims] 1. A bathtub, a pump for circulating hot and cold water in the bathtub, a water level sensor provided on the suction side of the pump for detecting the water level of the bathtub, and a heating provided on the discharge side of the pump. A hot water filling device comprising a bath circulation circuit including a water heater, and a hot water supply circuit for supplying hot water to the bathtub via the bath circulation circuit, wherein the hot water supply circuit is filled with water for controlling hot water supply. A backflow prevention device having a valve, an atmosphere opening port that is closed when hot water is supplied from the hot water supply circuit and is opened when hot water is stopped, and a first opening / closing valve is provided downstream of the backflow prevention device. The 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 water level sensor and a connection portion between the hot water supply circuit and the bath circulation circuit. , The hot water supply times Is a water filling start control means for supplying hot and cold water to the bath by the water pressure of a water supply source such as water supply by the opening operation of the water filling valve and the first on-off valve, and the second on-off valve. A parallel water filling control means for opening the water filling valve after opening the water filling valve and using the bath circulation circuit as a parallel supply path, and closing the second on-off valve after the water filling by the parallel water filling control means. And a water level detection control means for controlling the water level of the bathtub to be closed, and a water filling end control means for closing the water filling valve based on the water level detection of the water level detection control means. Characteristic water filling device. 2. A hot water recovery control means for activating the pump to recover hot water in the backflow prevention device after the hot water filling control is completed and the second on-off valve is closed. The water filling device according to claim 1.