JPH07101127B2 - Automatic water filling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a backflow prevention device having an atmosphere opening port formed in a pipe in a bath circulation circuit including a bathtub. The present invention relates to an automatic hot water filling device provided with a hopper for collecting hot water flowing out.

[Prior Art] In an automatic water filling device for supplying hot water to a bathtub installed at a high place by using the water supply pressure of the waterworks, it is necessary to separate the bathtub and the waterworks. A backflow prevention device with an atmosphere opening port formed between the stop valves is arranged in the pipe, and the atmosphere opening port is reversibly closed when the valve body on the upstream side is opened by the hot water supplied, and conversely When the supply is stopped, the atmosphere opening port is opened when the upstream valve body is closed.

That is, only when hot water is supplied, the atmosphere opening port is closed and the bathtub and the water supply are communicated.

Thus, in the backflow prevention device, the atmosphere opening port is opened and closed by the valve element that operates in response to the inflow of hot water, so when hot water flows into the valve chamber and when the inflow stops,
Not completely closed.

Therefore, when hot water starts or stops passing through the backflow prevention device, a small amount of hot water flows out from the atmosphere opening port.

The hot and cold water that flows out in this way is not necessary for filling, so it is possible to let it flow out as it is. It may be mistaken for a leak, and it is desirable to prevent it from leaking as much as possible.

For this reason, a hopper is provided outside the atmosphere opening port to temporarily store the hot water flowing out, and the hot water in the hopper is a pump provided in the bath circulation circuit after the electromagnetic valve for filling water is closed. Is pumped out into the bathtub.

[Problems to be Solved by the Invention] However, when attempting to complete the filling of the bathtub to the set water level as soon as possible, the hot water should be detected while continuously detecting the water level in the bathtub from the start of filling. It is possible to complete the filling of water faster as a result of supplying the collected amount of water to the bath at once and detecting the water level after the amount of water in the bath increases to some extent, rather than performing the filling.

In such a case, there are two operations for filling the bathtub: one is based on the amount of water and the other is to detect and supply the water level.
Street operation is required, and the hot water in the hopper is drained each time the water filling solenoid valve is closed, and the hopper drainage operation is performed during the water filling operation. There is a problem that it takes time.

In addition, when the filling water flow rate is low due to a decrease in the water supply pressure or other reasons when the filling water operation is being performed, the check valve cannot quickly open and close. The air vent cannot be closed. For this reason, the amount of hot and cold water flowing out from the atmosphere opening increases, and a large amount of hot and cold water tends to collect in the hopper as compared with the time of a normal filling operation.

The present invention relates to an automatic water filling device in which a backflow prevention device provided with a hopper is provided in a water filling pipe to a bathtub, and hot water accumulated in the hopper does not flow out of the hopper, and the water filling in the bathtub is performed. The purpose is to do it promptly.

[Means for Solving the Problems] In the present invention, claim 1 is the hot water connected to the suction side of the pump of a bath circulation circuit formed by connecting a heat exchanger having a heating means, a bathtub, and a pump. A water solenoid valve is arranged in the tension pipe, and the water solenoid valve downstream of the water solenoid valve is opened and closed by a valve element that operates between two check valves arranged in series between the check valves. In an automatic water filling device for arranging a backflow prevention device having an atmosphere opening port and opening and closing the water solenoid valve a plurality of times to perform a predetermined water filling control on the bathtub, the backflow prevention device includes the atmosphere. A hopper for collecting water flowing out from the opening is provided, and a discharge pipe having an electromagnetic valve for discharging hot water accumulated in the hopper is connected to the suction side of the pump, and the predetermined filling control is completed. If you activate the pump later The technical means is to provide drainage control means for opening the solenoid valve to drain hot water in the hopper.

A second aspect of the present invention is to arrange a water solenoid valve in a water filling pipe line connected to a suction side of the pump of a bath circulation circuit formed by connecting a heat exchanger having a heating means, a bathtub, and a pump,
A backflow prevention device, in which an atmosphere opening port that opens and closes by a valve body that operates according to inflow water pressure, is formed between two check valves arranged in series in the water filling pipe downstream of the water solenoid valve. In the automatic water filling device that opens and closes the water solenoid valve a plurality of times to perform a predetermined water filling control on the bathtub, the backflow prevention device is provided with a hopper that collects water flowing out from the atmosphere opening port. A discharge pipe having a check valve for discharging hot and cold water accumulated in the hopper is connected to the suction side of the pump, and the pump is operated after completion of the predetermined hot water filling control. The technical means is to provide a drainage control means for opening the check valve to supply hot water in the hopper.

According to a third aspect of the present invention, in the first and second aspects, a flow rate detecting means for detecting a flow rate is provided in the water filling pipe line, and the flow rate detected by the flow rate detecting means is equal to or less than a predetermined flow rate during the water filling control. The technical means is to stop the filling control, and at this time, drain the inside of the hopper by the drain control means for a predetermined time.

[Operation] In the present invention, as the filling operation, the water solenoid valve is opened and closed a plurality of times, and for example, a large amount of water is supplied to the bathtub at the beginning while detecting the amount of water, and then the water level is detected. While supplying hot water to the set water level.

In these filling operations, when the water solenoid valve is opened, the hot and cold water passes through the backflow prevention device arranged in the water filling pipe and flows into the bath circulation circuit. At this time, in the backflow prevention device, the hot water flows out and collects in the hopper before the atmosphere opening port is closed.However, when the hot water is normally filled, the valve body is quickly discharged by the hot water inflow. Since the opening is closed, the amount of hot water accumulated in the hopper is small.

Therefore, since the amount of hot water accumulated in the hopper by a plurality of times of filling operation is small, the hot water does not flow out from the hopper.

When the water filling operation by opening and closing the water solenoid valve a plurality of times is completed, the pump is operated, the solenoid valve or the check valve is opened, and the hot water in the hopper is pumped out from the discharge pipe.

On the other hand, when the water filling flow rate is low and the water filling operation is stopped, for example, when the water supply pressure is low,
In the case where the atmosphere opening port is not closed reliably, the amount of hot water flowing out from the atmosphere opening port is large and the amount of hot water accumulated in the hopper is large.

In such a case, when the predetermined filling control is interrupted, the hot water in the hopper is drained for a predetermined time, so that the hot water in the hopper can be reliably discharged, and the atmosphere during the subsequent filling operation is Even if hot water flows out from the opening, hot water does not overflow from the hopper.

EFFECTS OF THE INVENTION In the present invention, the water solenoid valve is opened and closed a plurality of times to perform the filling operation, but the hot and cold water in the hopper is not discharged until the water solenoid valve is opened and closed a plurality of times, and the predetermined amount of water is discharged. The draining operation of the hopper is performed when the filling control is no longer performed.

As a result, the filling operation can be completed promptly without interruption of the filling operation due to the drainage of the hopper.

On the other hand, if the hot water filling operation is not performed normally and the amount of hot water that accumulates in the hopper is large, the drainage time will be extended. It never overflows.

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

FIG. 2 shows a gas hot water bath system 1 as an automatic water filling device according to the present invention.

The gas hot water bath system 1 is a main heat exchanger that heats water supplied from a water supply pipe 11 connected to a water supply source such as water supply.
It comprises a hot water supply circuit 10 having 12 and a bath circulation circuit 30 for reheating the bathtub B.

A bypass pipe 14 whose other end is connected to a hot water outlet pipe 13 downstream of the main heat exchanger 12 is connected to the water supply pipe 11 as a bypass of the main heat exchanger 12, and the bypass pipe 14 is opened / closed as necessary. A bypass solenoid valve 15 for mixing hot water flowing out of the main heat exchanger 12 and water supplied from the water supply pipe 11 is provided.

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

The connection pipe 18 is provided with a solenoid valve for filling water (hereinafter referred to as "filling valve") 19 that is opened and closed according to a filling instruction.
Further, downstream thereof, a backflow prevention device 20 for preventing backflow of water from the bath circulation circuit 30 is provided.

As shown in FIG. 3, the check valve 20 includes a first check valve.
21 and the second check valve 22 are arranged in series, and the valve chamber of the first check valve 21.
Atmosphere opening 23 is formed in 21a, and the first check valve 21
The valve body 21b is provided with an atmosphere opening / closing valve 23a that operates reversibly,
The atmosphere opening port 23 is opened and closed by the atmosphere opening / closing valve 23a according to the opening operation of the valve body 21b accompanying the inflow of hot and cold water into the valve chamber 21a.

Further, the backflow prevention device 20 is provided with a hopper 24 outside the atmosphere opening port 23 for temporarily collecting hot water flowing out from the atmosphere opening port 23, and the hopper 24 is provided with the valve chamber through the atmosphere opening port 23. An external communication pipe 25 for communicating with 21a and the outside is provided, and a discharge pipe 26 for discharging water in the hopper 24 is provided at the bottom of the hopper 24.

The discharge pipe 26 is connected to the downstream side of the second check valve 22 and
The discharge solenoid valve (hereinafter referred to as “drainage valve”) 27 that controls discharge of hot and cold water in the hopper 24 is provided at the 26.

A connection valve 18 downstream of the backflow prevention device 20 is provided with a hot water filling opening / closing valve (hereinafter referred to as “opening / closing valve”) 28 as a two-way valve that performs an opening / closing operation in association with the opening / closing operation of the water filling valve 19. , Connecting pipe
Reference numeral 18 is downstream of the on-off valve 28 and is connected to the bath circulation circuit 30.

The bath circulation circuit 30 is connected to the connection pipe 18 from the connection portion 30A to the pump 3
1. A forward switching conduit 30a connected to the bathtub B via the bath heat exchanger 32 and a two-way transfer switching valve (hereinafter referred to as a "switching valve") for disconnecting the communication between the bathtub B and the connecting pipe 18. ) 33 is connected to the reverse direction pipeline 30b connected to the bathtub B via the bathtub B in a closed manner, and the forward direction pipeline 30a is always connected to the connecting portion 30A in each driving operation. From the connecting portion 30A to the bathtub B in both of the below-described transport operations in the reverse pipe 30b, and in the one-way transport operation and the reheating operation, On the contrary, hot water moves from the bathtub B toward the connecting portion 30A.

The pump 31 moves hot and cold water in the forward direction pipeline 30a by using the connection part 30A side as the suction part 31a and the bathtub B side as the discharge part 31b.

The forward conduit 30a is provided with a water flow switch 34 for detecting the water flow of the hot water in the bath circulation circuit 30, and the reverse conduit 30a.
30b includes a water level sensor 3 for detecting the water level in the bathtub B.
5 is equipped.

The water level sensor 35 uses a semiconductor diffusion resistance type pressure sensing element that utilizes the piezoresistance effect in which the electric resistance changes according to the strain of the semiconductor single crystal.

The hot water servo 16, the on-off valve 28, and the switching valve 33 are all driven by a gad motor, respectively.
The on-off valve 28 and the switching valve 33 are provided with a state detection element for detecting the open state or closed state of each.

In FIG. 2, 36, 37, 38 are thermistors, 39,
40 is a flow sensor.

The main burner 41 and bath burner are installed in each heat exchanger 12, 32.
In the fuel supply pipe 43 to each burner 41, 42, 44 is a former solenoid valve, 45 and 46 are gas solenoid valves, 47 is a governor proportional valve, 48 is a gas governor, and 49 is a gas solenoid valve.

Further, 41a, 42a is a blower for supplying combustion air to each burner 41, 42, further, to each burner 41, 42,
It is provided on 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 is composed of a microcomputer and some driving circuits, and is provided with, for example, a bath remote controller 51 installed in a bathroom and a main remote controller 52 installed in a kitchen. Combustion control and water control are performed according to the detection status of the thermistor, etc.
Performs automatic filling operation, reheating operation, and heat retention operation.

Each remote control is equipped with a setting switch for setting the hot water supply temperature for hot water supply operation, the hot water filling temperature for hot water filling, and the liquid level display for displaying the set state and operating state. When a fully automatic switch provided on the remote control is operated, fully automatic operation is performed with a series of operation operations including automatic filling operation, reheating operation, and heat retention operation.

Regarding fully automatic operation, there is an operation switch for setting a temperature higher or lower by a predetermined temperature than the set temperature, or a water level higher by a predetermined water level than the set water level. When these switches are operated, fully automatic operation under the changed conditions is performed.

In the hot water supply operation, a main water burner 41 is heated when a hot water supply plug (not shown) provided at the downstream end of the hot water supply pipe 17 is opened and water flow is detected by the flow rate sensor 39, and the main burner is operated according to the set temperature of each remote controller. In addition to adjusting the combustion amount of 41, the hot water supply servo 16 and the bypass solenoid valve 15 adjust the hot water supply amount.

The automatic water filling operation is performed only when the hot water supply operation is not performed when the fully automatic switch provided on each remote controller is operated as a water filling switch, and is related to the presence or absence of hot water in the bathtub B. Instead, the filling of water is completed under the condition set in the bathtub B.

As the filling operation in the automatic filling operation, there are two operations, that is, the one-way conveying operation of filling the bath circulation circuit 30 from the forward direction conduit 30a to the bath B and the forward direction conduit 30a and the backward direction conduit 30b. 2 with both transport operations to fill the bathtub B with a pipe
As described below, each filling operation is performed in a predetermined sequence.

The automatic filling control will be described below with reference to FIG.

In the automatic hot water filling control, as the priming water for the operation of the pump 31 for determining whether or not there is hot water in the bathtub B, or for detecting the water level when there is hot water in the bathtub B, first 5 Then, the hot water and the hot water are supplied into the respective pipelines.

After that, as the water determination, the pump 31 is driven to determine the presence / absence of hot water in the bath circulation circuit 30, and if a water flow is detected by the water flow switch 34, it is determined that hot water remains in the bathtub B.

When it is determined by the water determination that there is hot water (YES in step 2), it is determined whether or not the water level in the bathtub B is up to the water level preset by the remote controller (step 3).

If it is determined in step 3 that the set water level has been reached (YES), it is considered that a considerable amount of water remains in the bathtub B, and therefore the temperature of the water in the bathtub B is increased. Then, the process proceeds to step 10 described later.

If it is determined in step 3 that the set water level has not been reached (NO), the process proceeds to step 9 to be described later in order to further fill the water.

As a result of the water determination in step 2, when it is determined that there is no hot water in the bathtub B (NO), the metering hot water filling up to the amount of water calculated in advance corresponding to the water level of the bathtub B is performed by both transport operations. (Step 4).

After the metering hot water filling is completed, the pump 31 is operated again to judge water (step 5).

Normally, in this water determination, it is determined that there is hot and cold water in the bathtub B because hot water near the set water level in the bathtub B is being supplied, but in this water determination, there is no hot and cold water in the bathtub B. If it is determined (NO in step 5), it is considered that the drain plug of bathtub B has been forgotten to be closed, so an error stop is performed (step 6), and then the hopper drainage request for draining the hopper 24 is performed. Is set (step 7).

If there is hot water in the bathtub B in the water determination in step 5 (YES), it is determined whether or not the hot water in the bathtub B has reached the set water level.

If the set water level has not been reached (in step 8
NO), the one-sided transport operation is performed based on the water level detected by the water level sensor 35 provided in the reverse direction pipeline 30b (step 9).

When it is determined that the hot and cold water in the bathtub B is up to the set water level (YES in step 8), the one-sided transport operation in step 9 is omitted, and the process proceeds to step 10.

In step 10, the hot and cold water in the bathtub B, which has reached the set water level, is driven by the pump 31 to be circulated and heated by the bath burner 42. This heating is performed until the hot water temperature detected by the thermistor 38 rises to the set temperature set by the remote controller (NO in step 11).

By this heating, when the hot water temperature is heated to the set temperature set by the remote controller (YES in step 11), it means that the hot water filling operation is completed, and the hopper drainage request is made in order to drain the water in the hopper 24. Set (Step 1
2).

Next, both of the above-mentioned transport operations will be described with reference to FIG.

In both transport operations, a switching valve is provided to protect the water level sensor 35.
Since it is necessary to close 33 in advance, it is determined whether or not the switching valve 33 is closed, and if it is not closed (NO in step 21), the gad motor is driven for a certain time and the switching valve 33 is closed. A closing operation is performed (step 22).

When the switching valve 33 is closed (YES in step 21), subsequently, it is determined whether or not the opening / closing valve 28 is open to protect the backflow prevention device 20, and if it is closed ( If NO in step 23), the gad motor is driven for a certain period of time to open the opening / closing valve 28 (step 24).

If the on-off valve 28 is open (YE
S), in order to prevent water hammer, the hot water servo 16 is closed (step 25) to limit the flow rate when the hot water filling valve 19 is opened so that the hot water servo 16 closes to the minimum opening. When detected, the water filling valve 19 is opened (step 26).

When the water filling valve 19 is opened and water filling is started, in order to prevent the low-cut operation described below from being performed,
Next, the hot water servo 16 is opened (step 27) to obtain a sufficient hot water flow rate.

Up to this point, since only the forward pipe line 30a of the bath circulation circuit 30 has been filled with hot water, the switching valve 33 is opened (step 2
8), hot water is also supplied to the bathtub B from the reverse direction pipeline 30b to perform both transport operations.

When the amount of water supplied to the bathtub B after the water filling valve 19 is opened reaches the amount of water calculated in advance for the water level of the bathtub B (YES in step 29), the hot water servo 16 is closed. To limit the flow rate (step 30), and subsequently to close the switching valve 33 (step 31), and then to fill the water.
Close 19 (step 32).

After that, the hot water servo 16 is opened (step
33) and then the on-off valve 28 is closed (step 34).

Next, the single transport operation will be described with reference to FIG.

In the one-sided transport operation, hot water is not supplied from the reverse direction pipeline 30b, so it is determined whether or not the switching valve 33 is closed, and if it is not closed (N in step 41).
O), the gad motor is driven to close the switching valve 33 (step 42).

If the switching valve 33 is closed (YE
S) determines whether the open / close valve 28 is open and
If is closed (NO in step 43), the gad motor is driven to open the opening / closing valve (step 4).
Four).

If the on-off valve 28 is open (YE
S) Then, the hot water servo 16 is closed to prevent water hammer (step 45), the flow rate when the hot water filling valve 19 is opened is limited, and it is detected that the hot water servo 16 is closed. The water filling valve 19 is opened (step 46).

When the water filling valve 19 is opened and the water filling is started, the water quantity servo 16 is opened this time (step 47) so that a sufficient water filling flow rate can be obtained.

The water level of the bathtub B is detected by the water level sensor 35 in the one-sided transport operation, but the one-sided transport operation is performed after the water determination in the bath circulation circuit 30 is performed by the driving of the pump 31 and in the reverse direction pipe. Since the passage 30b is filled with hot water, the water level can be detected by the water level sensor 35.

If the detected water level in bathtub B has reached the water level set by the remote control (YE in step 48)
S), closing the hot water servo 16 to limit the flow rate (step 49), and then closing the hot water filling valve 19 (step 5).
0).

After that, the hot water servo 16 is opened (step 51),
Further, the on-off valve 28 is closed (step 52).

Next, the hopper drainage operation will be described.

The hopper drainage is the hot water flowing out of the atmosphere opening port 23 when the hot water filling valve 19 is opened and closed, and the hot and cold water stored in the hopper 24 is discharged to the external communication pipe 25.
This is to prevent leakage from the outside to the outside and to prevent problems due to freezing during cold weather.

In the present embodiment, hopper drainage is performed when there is a flag indicating a hopper drainage request at the time of stopping the filling operation due to an error after the completion of the automatic filling operation.

The hopper drainage control will be described below with reference to FIG.

In the hopper drainage control, it is determined whether or not there is the above-mentioned hopper drainage request flag, and if there is a hopper drainage request (YES in step 61), it is determined whether or not the switching valve 33 is closed and the switching is performed. When the valve 33 is open (NO in step 62), the switching valve 33 is closed (step 63).

If the switching valve 33 is closed (YE
S) determines whether the open / close valve 28 is open and
If is closed (NO in step 64), the on-off valve 28 is opened (step 65).

If the on-off valve 28 is open (YES in step 64),
The driving of the pump 31 is started (step 66), and it is determined whether or not the low cut operation has been performed.

Here, the low-cut operation means that the automatic filling operation is temporarily suspended when the flow rate detected by the flow rate sensor 40 does not reach a sufficient value despite the fact that the filling valve 19 is opened and the hot water servo 16 is opened. Then, the water filling valve 19 is closed.

This low-cut operation may be performed when the hot water supply operation is performed during the water filling operation, when the water pressure of the water supply is extremely low, or when there is blockage of the pipeline in the bath circulation circuit 30, etc. To be

When such a low-cut operation occurs, in the check valve 20, the first check valve 21 does not open smoothly, and as a result, the atmosphere opening / closing valve 23a does not close the atmosphere opening port 23 promptly. , More hot water than normal 23
A large amount of hot and cold water collects in the hopper 24.

Therefore, it is necessary to lengthen the operating time of the pump 31 for draining the hopper.

Therefore, regarding the setting of the operation time of the drainage timer that determines the operation time of the hopper drainage, when the low-cut operation is not performed (NO in step 67), the amount of hot water in the hopper 24 is small, so the operation of the drainage timer If the time is set as short as 5 seconds (step 68) and the low-cut operation is performed (YES at step 67), since the amount of hot water in the hopper 24 is large, the operation time of the drainage timer is set as long as 15 seconds. Yes (step 69).

Two seconds after the pump 31 is driven (step
(YES at 70), during which hot water in the valve chamber 21a of the first check valve 21 is pumped out, and the drain valve 27 is opened after 2 seconds have elapsed (step 71).

When the time set in the drain timer has elapsed since the pump 31 was activated (YES in step 72), the opening / closing valve 28
Is closed (step 73), the bath circulation circuit 30 and the backflow prevention device 20 are separated to prevent hot water in the bathtub B from flowing back into the hopper 24, and then the pump 31 is stopped (step
74), the drain valve 27 is also closed (step 75).

After that, the switching valve 33 is opened (step 76), and the low cut control of the hopper drainage will be described in detail with reference to FIG.

The low-cut control is performed when the filling operation is performed in accordance with an instruction from the remote controller, and it is determined whether filling is being performed or not depending on whether the filling valve 19 is open (step 81).

Further, when the hot water filling valve 19 opens, as described above, since the flow rate is limited by the hot water amount servo 16 in order to prevent a water hammer, whether the opening degree of the hot water amount servo 16 has become sufficiently large or not. For the purpose of determination, it is determined whether or not the hot water servo 16 has been opened after the water filling valve 19 is opened (step 8).
2) Then, it is determined whether or not a time t1 (for example, 5 seconds) necessary for the opening degree of the hot water servo 16 to become sufficiently large has elapsed since the opening operation started (step 83).

As a result of the above determination, when the condition for reliably filling the bathtub B in the water circuit is satisfied (YES in steps 81 to 83), the filling flow rate detected by the flow rate sensor 40 is used as a reference. It is determined whether or not the flow rate is equal to or more than the flow rate (3 / min) (step 84).

If the detected flow rate does not reach the reference flow rate (step 84)
YES, in order to prevent the influence of the pulsating flow, it is determined whether or not the flow rate that does not reach the reference flow rate continues for a predetermined time t2 (for example, 2 seconds), and does not reach the reference flow rate for the predetermined time t2. If (YES in step 85), the water filling is stopped for the first time as the low-cut operation (step 8).
6).

In this case, in the backflow prevention device 20, since the atmosphere opening / closing valve 23a does not close the atmosphere opening port 23 promptly because the passing flow rate is small, the inside of the hopper 24 is compared with the case where the filling operation is normally performed. And a lot of hot and cold water collects.

Therefore, the hopper drainage element is set (step 87).

In this way, when the filling water flow rate does not reach the reference flow rate, when the hot water supply circuit 10 or the bath circulation circuit 30 is blocked, and when the hot water supply pipe 13 is branched from the hot water supply pipe 13 to the connection pipe 18. It is considered that hot water is being supplied from the hot water supply pipe 17 side.

Therefore, it is determined whether or not the cause of the small amount of filling water is due to the hot water supply operation or other reasons (step 88).

Whether or not the hot water supply operation is in progress is performed by comparing the flow rate detected by the flow rate sensor 40 with the flow rate detected by the flow rate sensor 39. It is determined that the hot water supply operation is in progress.

When it is determined in step 88 that the hot water supply operation is not being performed (NO), the number of times of the hot water filling stop n (initial value =
1 is added to 0) (step 89), and it is determined whether or not the number of times n of filling is less than a predetermined number (3 times) or less (step 90).

If the number n of times of water filling is less than or equal to 3 (YES in step 90), it is possible that the water filling operation could not be performed normally for some reason. Therefore, set the water filling start request. (Step 91), the water filling operation is restarted.

If the number of times n the filling is stopped exceeds 3 (NO in step 90), it is considered that there is an obvious abnormality and the filling cannot be performed normally, so the error is stopped (step 92). ), The drainage request of the hopper 24 is set (step 93), and the filling operation is completed.

In this case, the equipment for filling the water cannot be used unless the power is turned off or the reset switch (not shown) is operated.

On the other hand, when it is determined in step 88 that the hot water supply operation is in progress (YES), it is determined whether the cumulative stop time during which the hot water supply operation is interrupted is within the predetermined time t3. To do.

If the hot water filling stop time is shorter than the predetermined time t3 (NO in step 94), it is determined whether or not the hot water supply operation is finished. If the hot water supply operation is not finished (step 95)
(NO in step NO), the process proceeds to step 94, and it is repeatedly determined whether or not the hot water supply operation has been completed until the cumulative stop time reaches the predetermined time t3.

If it is determined that the hot water supply has ended before the cumulative stop time reaches the predetermined time t3 (YE at step 95).
S), set a request to restart hot water filling operation (step 9
6) Perform hot water filling operation.

On the other hand, when the cumulative value of the stopping time of the hot water filling operation due to the hot water supply operation reaches the predetermined time t3 (YE at step 94).
S) In order to prompt the suspension of the hot water supply operation, the process proceeds to step 92 and the error is stopped.

Next, in the gas hot water bath system 1 of the present embodiment configured as described above, the filling operation of the double-conveying operation or the single-conveying operation will be briefly described.

When it is confirmed that the switching valve 33 is closed, the water filling valve 19
The opening / closing valve 28 is opened prior to, and the hot water filling servo valve 16 opens the hot water filling valve 19 with the flow rate limited.

Then, in the hot water supply circuit 10, the water supplied from the water supply pipe 11 passes through the main heat exchanger 12 and is heated.
It passes through the backflow prevention device 20 and the on-off valve 28 and flows into the bath circulation circuit 30.

At this time, in the backflow prevention device 20, hot water flows out from the atmosphere opening port 23 to the hopper 24, but the valve body 21b of the first check valve 21 moves quickly by the hot water, and the atmosphere opening / closing valve 23a quickly opens to the atmosphere. Due to the closing of the mouth 23, its quantity is very small.

Therefore, when the bathtub B is empty at the time of starting the filling of water, normally, three carrying operations are performed, which is a combination of two carrying operations and a single carrying operation. In the operation, even if the hot water filling valve 19 is opened and closed six times for the sake of convenience, the amount of hot water accumulated in the hopper 24 is small. Can be discharged.

The switching valve 33 is closed, and hot water is supplied to the bathtub B from only the forward pipe line 30a.

After that, the hot water servo 16 is opened to increase the flow rate, and the hot water filling operation is judged.

If the water filling operation is for both transports, switch valve 33
Is opened, and the bathtub B is also filled with water from the reverse pipe 30b.

At this time, since the hot water supplied from the connecting pipe 18 has already been supplied to the bathtub B by the forward pipe 30a, the inflow pressure into the reverse pipe 30b is higher than that at the initial stage when the filling valve 19 is opened. Since it is much smaller, it has little effect on the water level sensor 35.

In the case of both transport operations, when the amount of water corresponding to the water level set by the remote controller is supplied into the bathtub B, and in the case of one-sided transport operation, the hot water servo 16 closes respectively. After that, the water filling valve 19 is closed to finish the water filling, and then the water quantity servo 16 is opened and the open / close valve 28 is closed.

After that, when the predetermined boiling operation ends and there is a hopper drainage request, the hot and cold water in the hopper 24 is collected in the bathtub B.

At this time, in the state where the drain valve 27 is closed, the water in the valve chamber 21b is collected through the second check valve 22 for a predetermined time (2 seconds).
After that, when the discharge valve 27 is opened, the water in the hopper 24 is collected and sent into the bath B, respectively.

When the water in the backflow prevention device 20 has been collected, the heat retention control is performed as a series of fully automatic operations.

On the other hand, when the water filling operation is stopped because the water filling flow rate is insufficient, in the hopper 24, the water filling valve 19 is opened or closed once as compared with the normal water filling operation. The amount of hot and cold water accumulated in the hopper 24 is large, but since the hopper is drained immediately after the operation stop operation, the hot and cold water in the hopper 24 does not overflow from the external communication pipe 25.

As described above, in the present invention, in a normal filling operation in which the amount of hot and cold water accumulated in the hopper 24 is small, hopper drainage is not performed until the filling operation is completed, so quick filling can be performed. .

In addition, when the filling of water is not normally performed and the amount of hot water accumulated in the hopper 24 is large, the hopper is drained immediately when the filling operation is stopped, and at this time, the drainage time is longer than usual. Therefore, the hot and cold water in the hopper 24 can be reliably discharged, and the hot and cold water of the hopper 24 will not overflow when the hot water filling operation is performed thereafter.

In this embodiment, the discharge pipe of the hopper is provided with the discharge solenoid valve, but a check valve may be used instead of the discharge solenoid valve.

In this case, the check valve is opened by the atmospheric pressure and the negative pressure due to the operation of the pump 31, and the suction drainage is performed.
The drainage period can be specified by controlling the operation of.

In this embodiment, the automatic water filling device using gas as the fuel is shown, but a device using petroleum as the fuel or an electric heating device may be used.

[Brief description of drawings]

FIG. 1 is a flow chart for explaining automatic filling control in an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a gas hot water bath system showing an embodiment, and FIG. 3 is a gas hot water bath system of this embodiment. 4 is a sectional view showing the backflow prevention device in FIG. 4, FIG. 4 is a flow chart for explaining both conveying operations in this embodiment, FIG. 5 is a flow chart for explaining one-side conveying operation in this embodiment, and FIG. FIG. 7 is a flow chart for explaining the hopper drainage control in the embodiment, and FIG. 7 is a flow chart for explaining the low cut control in the present embodiment. In the figure, 1 ... Gas hot water bath system (automatic filling device), 10 ... Hot water supply circuit (filling pipe line), 19 ... Solenoid valve for filling water (water solenoid valve), 20 ... Backflow prevention device, 21 …… First
Check valve (check valve), 22 ... Second check valve (check valve), 23 ...
... atmosphere opening, 23a ... atmosphere opening / closing valve (valve body), 24 ... hopper, 26 ... discharging pipe, 27 ... discharging solenoid valve (solenoid valve),
28 …… Open / close valve for hot water filling (open / close valve), 30 …… Bath circulation circuit, 31 …… Pump, 32 …… Bath heat exchanger (heat exchanger),
40 ... Flow rate sensor (flow rate detection means), 42 ... Bath burner (heating means), 50 ... Control device (drainage control means), B ...
… Bathtub.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichi Kuriki, No. 26, Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Prefecture, Rinnai Co., Ltd. (56) References JP-A-3-251656 (JP, A) JP-A 2-37226 (JP, A) Actual flat 3-14379 (JP, U)

Claims (3)

[Claims] 1. A water solenoid valve is arranged in a water filling pipe line connected to a suction side of a pump of a bath circulation circuit formed by connecting a heat exchanger having a heating means, a bath, and a pump,
A backflow prevention device, in which an atmosphere opening port that opens and closes by a valve body that operates according to inflow water pressure, is formed between two check valves arranged in series in the water filling pipe downstream of the water solenoid valve. In the automatic water filling device that opens and closes the water solenoid valve a plurality of times to perform a predetermined water filling control on the bathtub, the backflow prevention device is provided with a hopper that stores water flowing out from the atmosphere opening port. At the same time, a discharge pipe having an electromagnetic valve for discharging hot and cold water accumulated in the hopper is connected to the suction side of the pump to operate the pump and open the electromagnetic valve after completion of the predetermined hot water filling control. An automatic hot-water filling device, characterized in that a drainage control means is provided for discharging drainage of hot water in the hopper. 2. A water solenoid valve is arranged in a water filling pipe line connected to the suction side of the pump of a bath circulation circuit formed by connecting a heat exchanger having a heating means, a bathtub, and a pump,
A backflow prevention device, in which an atmosphere opening port that opens and closes by a valve body that operates according to inflow water pressure is formed between two check valves arranged in series, is provided in the water filling pipe downstream of the water solenoid valve. In the automatic water filling device that opens and closes the water solenoid valve a plurality of times to perform a predetermined water filling control on the bathtub, the backflow prevention device is provided with a hopper that stores water flowing out from the atmosphere opening port. At the same time, a discharge pipe having a check valve for discharging hot and cold water accumulated in the hopper is connected to the suction side of the pump, and the pump is operated after the predetermined hot water filling control is completed. An automatic hot water filling device comprising a drainage control means for opening a check valve to feed hot water in the hopper. 3. The water filling pipe is provided with a flow rate detecting means for detecting a flow rate, and when the flow rate detected by the flow rate detecting means is below a predetermined flow rate during the water filling control, the water filling control is performed. 3. The automatic water filling device according to claim 1, wherein the automatic water filling device is stopped, and at this time, the water in the hopper is drained by the drainage control means for a predetermined time.