JP2005076945A - Hot-water supply bath device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent unneeded outflow of hot water from a backflow preventer by detecting the frozen state of a re-heating pipe. <P>SOLUTION: A hot-water supply bath device comprises a hot water supply circuit 8 via a heat exchanger 7 for supplying hot water; a re-heating circuit 16 via a heat exchanger 18 for re-heating; a flow rate sensor 24 for supplying hot water for detecting the flow rate of the hot water supply circuit 8; a hot water pouring circuit 33 for pouring hot water heated by the heat exchanger 7 for supplying hot water via a poured water solenoid valve 21 branched from the hot water supply circuit 8, the flow rate sensor 24 for supplying hot water, the backflow preventer 22, and a check valve 23; and a controlling means 24. In the hot-water supply bath device, a controlling means 34 performs the closing operation of the poured water solenoid valve 21, based on the detection flow rate of the a flow rate sensor 2 for supplying hot water and the flow rate sensor 24 for pouring hot water when the poured water solenoid valve 21 is being closed, and stops water pouring operation to the re-heating circuit 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water bath apparatus including a hot water solenoid valve for supplying hot water heated by a heat exchanger for hot water supply to a memorial circuit.

  Conventionally, in this type of hot water bath apparatus, the flow rate sensor for pouring is provided on the upstream side of the pouring electromagnetic valve (for example, see Patent Document 1).

  The configuration is substantially as shown in FIG. That is, during the hot water supply operation, when the hot water tap 1 is opened, the hot water flow sensor 2 detects water flow, the combustion fan 3 rotates, the gas source solenoid valve 4 and the gas proportional valve 5 open, and the burner 6 is ignited. Then, it is heated by the hot water supply heat exchanger 7.

  Here, the hot water heated by the hot water supply heat exchanger 7 is mixed with the water on the incoming side by a bypass control valve 9 provided on the incoming side of the hot water supply circuit 8. The opening of the bypass control valve 9 is adjusted by the signal from the hot water thermistor 11 so that the mixed hot water reaches the hot water set temperature set by the remote control 10 for remote operation, and hot water is supplied from the hot water tap 1 through the hot water connection port 12. .

  Next, during the recuperation operation, when circulation of the bath water 15 of the bathtub 14 is detected by the circulating water detector 17 through the recirculation return passage 16 by the circulation pump 13, the combustion fan 3 rotates and the gas source The solenoid valve 4 and the gas proportional valve 5 are opened, the burner 6 is ignited, heated by the reheating heat exchanger 18, and circulated from the retreating passage 19 to the bathtub 14 through the retreating pipe 20.

  Next, at the time of the automatic hot water operation, the hot water heated by the hot water supply heat exchanger 7 opens the pouring electromagnetic valve 21, passes through the backflow prevention device 22 and the check valve 23, and returns to the retrace passage 16 and retreats. It is supplied from the passage 19 to the bathtub 14 through the memorial pipe 20.

Here, the flow rate of the hot water beam is detected by a pouring flow sensor 24 provided on the upstream side of the pouring solenoid valve 21. Moreover, the hot water or water flowing out from the backflow prevention device 22 is drained from the overflow connection port 25 to the outside of the apparatus.
Japanese Patent Publication No. 7-94929 (Fig. 1)

  However, in the conventional hot water bath apparatus, the pouring flow rate sensor 24 is provided on the upstream side of the pouring solenoid valve 21, and the flow to the reheating pipe 20 and the flow to the overflow connection port 25 cannot be determined. When the reheating pipe 20 connected to the device is frozen and cannot pass water, the problem is that hot water continues to flow out of the machine from the overflow connection port 25 led from the backflow prevention device 22 during the automatic hot water operation. Had.

  The present invention solves the above-mentioned problem, and determines whether the reheating pipe is frozen based on the flow rate sensor provided in the hot water supply circuit and the flow rate detected by the flow rate sensor provided in the hot water supply circuit. The purpose of this is to stop the hot water operation and prevent the outflow of wasted hot water from the backflow prevention device.

  To achieve the above object, the hot water bath apparatus of the present invention comprises a hot water supply circuit, a reheating circuit, a hot water flow sensor for detecting the flow rate of the hot water circuit, a hot water solenoid valve branched from the hot water circuit, and a hot water flow rate. A hot water supply circuit for pouring water into a reheating circuit via a sensor, a backflow prevention device, a check valve, and a control means, and the control means has a flow rate for hot water supply when the hot water solenoid valve is open. The pouring solenoid valve is closed based on the detected flow rate of the sensor and the pouring flow rate sensor, and the pouring operation to the reheating circuit is stopped.

  According to the above invention, in the pouring operation to the reheating circuit, it is easy to determine whether or not the reheating circuit is normally poured based on the difference between the flow rate flowing through the hot water supply circuit and the flow rate flowing through the pouring circuit. It is possible to determine, and it is possible to prevent wasteful hot water from flowing out of the backflow prevention device that occurs when the reheating pipe or the like is frozen.

  As described above, according to the present invention, in the pouring operation to the reheating circuit, whether or not the pouring circuit is normally poured based on the flow rate flowing through the hot water supply circuit and the flow rate flowing through the pouring circuit is determined. This makes it possible to easily determine and to prevent wasteful hot water from flowing out of the backflow prevention device that occurs when the reheating pipe or the like is frozen.

  The invention described in claim 1 includes a hot water supply circuit that passes through a heat exchanger for hot water supply, a reheating circuit that passes through a heat exchanger for reheating, a flow rate sensor for hot water supply that detects a flow rate of the hot water supply circuit, and the hot water supply A pouring circuit that branches from the circuit and supplies hot water heated by the heat exchanger for hot water supply to the reheating circuit via a pouring solenoid valve, a pouring flow sensor, a backflow prevention device, and a check valve in this order; A hot water bath apparatus comprising a control means, wherein the control means is configured to control the hot water solenoid valve based on the detected flow rates of the hot water flow sensor and the hot water flow sensor when the hot water solenoid valve is open. The pouring operation to the reheating circuit is stopped, and in the pouring operation to the reheating circuit, the flow rate flowing through the hot water supply circuit and the pouring circuit are changed. Based on the difference in flow rate, The pouring is that whether or not can be easily determined, the useless hot water from flowing out of the backflow prevention device that occurs during freezing of piping reheating can be prevented.

  According to a second aspect of the present invention, when the pouring solenoid valve is in an open state, the control means detects the hot water flow rate sensor at a predetermined flow rate or higher, and the pouring flow rate sensor at a predetermined flow rate or lower. When detected, the hot water solenoid valve is closed to stop the hot water pouring operation to the reheating circuit. The operation can be stopped.

  According to a third aspect of the present invention, when the pouring solenoid valve is open, the control means detects when the hot water flow sensor detects a predetermined flow rate or more, and when the pouring flow sensor detects a predetermined flow rate or less, The pouring solenoid valve is closed and the pouring operation to the reheating circuit is stopped, and the detected flow rate of the hot water flow sensor is checked again.If the detected flow rate is less than the predetermined flow rate, the subsequent pouring solenoid valve is opened. It is characterized by stopping operation, and hot water continues to flow out of the machine through the overflow connection port in order to stop the automatic hot water operation by detecting the outflow of hot water from the backflow prevention device. Can be prevented.

  According to a fourth aspect of the present invention, when the pouring solenoid valve is in an open state, the control means detects when the hot water flow rate sensor detects a predetermined flow rate or more, and when the pouring flow rate sensor detects a predetermined flow rate or less, The pouring solenoid valve is closed and the pouring operation to the reheating circuit is stopped, and the detected flow rate of the hot water flow sensor is checked again.If the detected flow rate is less than the predetermined flow rate, the subsequent pouring solenoid valve is opened. The feature is that the operation is stopped and an abnormality is displayed at the same time. Hot water is discharged from the overflow connection port in order to detect the outflow of hot water from the backflow prevention device and stop the automatic hot water operation. It is possible to notify the user of the device of the occurrence of the abnormality by preventing it from continuously flowing out.

  According to a fifth aspect of the present invention, when the pouring solenoid valve is open, the control means performs the closing operation of the pouring solenoid valve based on the detected flow rates of the hot water flow sensor and the pouring flow sensor, and thereafter In addition, a series of determination operations of determining the closing operation of the pouring solenoid valve according to the detection current of the hot water flow sensor is performed a predetermined number of times. It is possible to reliably detect the outflow of the water.

  According to a sixth aspect of the present invention, when the pouring electromagnetic valve is open, the control means performs the closing operation of the pouring electromagnetic valve based on the detected flow rates of the hot water flow sensor and the pouring flow sensor, and thereafter When a series of determination operations for determining the closing operation of the pouring solenoid valve according to the detection current of the hot water flow sensor is performed a predetermined number of times, if it is determined as abnormal, It is characterized by stopping the opening operation and displaying an abnormality, and reliably detecting the outflow of hot water from the backflow prevention device, and from the backflow prevention device to stop the automatic hot water operation. It is possible to prevent the hot water from flowing out and to prevent the hot water from flowing out from the overflow connection port to notify the user of the device of the occurrence of the abnormality.

  According to a seventh aspect of the present invention, when the pouring solenoid valve is in an open state, the control means detects when the hot water supply flow sensor detects a predetermined flow rate or more and when the pouring flow sensor detects a predetermined flow rate or less, The pouring solenoid valve is closed to stop the pouring operation to the reheating circuit, and the detected flow rate of the hot water flow rate sensor is checked again. If the detected flow rate is equal to or higher than the predetermined flow rate, the detected flow rate of the hot water flow rate sensor is The hot water solenoid valve is in a standby mode in which the operation of opening the pouring solenoid valve is not performed until the flow rate becomes less than a predetermined flow rate. Judging that the operation and hot water supply were used at the same time and waiting for the opening operation of the pouring solenoid valve, it becomes a hot water supply priority operation, and it is possible to prevent the deterioration of user convenience due to a decrease in the amount of hot water discharged from the hot water tap It becomes.

  The invention according to claim 8 is characterized in that, in the standby mode, when the detected flow rate of the hot water flow rate sensor becomes equal to or lower than a predetermined flow rate, the opening operation of the hot water solenoid valve is started. The automatic hot water operation can be resumed immediately afterward.

  Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described with the same numbers.

(Example 1)
FIG. 1 is an overall configuration diagram of a hot water bath apparatus according to a first embodiment of the present invention.

  First, during the hot water supply operation, when the hot-water tap 1 is opened, the hot water flow sensor 2 detects water flow, the combustion fan 3 rotates, the gas source solenoid valve 4 and the gas proportional valve 5 open, and the burner 6 is ignited. Then, it is heated by the hot water supply heat exchanger 7.

  Here, the hot water heated by the hot water supply heat exchanger 7 is mixed with the water on the incoming side by a bypass control valve 9 provided on the incoming side of the hot water supply circuit 8. The opening of the bypass control valve 9 is adjusted by the signal from the hot water thermistor 11 so that the mixed hot water reaches the hot water set temperature set by the remote control 10 for remote operation, and hot water is supplied from the hot water tap 1 through the hot water connection port 12. .

  Next, during the reheating operation, when the circulating water 13 detects the circulation of the bathtub water 15 of the bathtub 14 via the reheating return passage 16 which is one path of the reheating circuit, the water for the combustion is detected. The fan 3 is rotated, the gas source solenoid valve 4 and the gas proportional valve 5 are opened, the burner 6 is ignited, heated by the reheating heat exchanger 18, and the reheating path 19 which is the other path of the reheating circuit. Is circulated to the bathtub 14 through the recirculation pipe 20.

  Next, during the automatic hot water operation, the hot water heated by the hot water supply heat exchanger 7 is prevented from flowing back when the hot water solenoid valve 21 provided in the hot water circuit 8a branched in the middle of the hot water circuit 8 is opened. It is supplied to the tub 14 through the reheating pipe 20 and the recirculation return passage 16 and retreating passage 19 through the device 22, the pouring flow sensor 24 and the check valve 23.

  Here, the flow rate of the hot water beam is detected by a pouring flow rate sensor 24 provided between the backflow prevention device 22 and the check valve 23. Moreover, the hot water or water flowing out from the backflow prevention device 22 is drained from the overflow connection port 25 to the outside of the apparatus.

  FIG. 2 is a structural diagram showing the internal structure of the backflow prevention device 22. Reference numeral 26 denotes a pressure chamber, and a water supply source pressure on the water inlet side is guided by a pressure introduction pipe 27. 28 is a diaphragm, 29 is an air release valve, and has a valve body 30 such as rubber. Reference numeral 31 denotes an atmosphere opening, 32 a spring, and 33 a hot water pouring circuit serving as a hot water circulating passage.

  About the hot water bath apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  Normally, at the time of automatic hot water operation, the water supply source pressure on the inflow side is applied to the pressure chamber 26 from the pressure introduction pipe 27, and the diaphragm 28 is connected to the hot water circulation passage due to the pressure difference with the hot water circulation passage 33 which is a pouring circuit. Since the air release valve 29 is pushed in the closing direction because it moves to the side 33, the air release port 31 and the hot water circulation passage 33 are not communicated with each other by the valve body 30.

  Here, if the reheating pipe 20 is frozen and cannot pass water, the water supply source pressure is applied to the pressure chamber 26 of the backflow prevention device 22 and the hot water circulation passage 33 during the automatic hot water operation, and the same pressure is applied. Therefore, the pressure difference disappears and the atmosphere release valve 29 is opened to the atmosphere by the spring 32.

  When the air release valve 29 is opened to the atmosphere, the hot water circulation passage 33 and the air release port 31 communicate with each other. It will flow out of the machine from the connection port 25.

  Therefore, during an automatic hot water operation in which the hot water solenoid valve 21 is open, the hot water flow rate sensor 2 detects a predetermined flow rate or more and a hot water flow rate sensor 24 provided downstream of the backflow prevention device 22. Is detected to be below a predetermined flow rate, the hot water supplied from the hot water supply circuit 8 may have flowed out from the atmosphere opening 31 of the backflow prevention device 22, and the control means 34 has frozen the reheating pipe 20. Is determined so that the hot water solenoid valve 21 is closed, and the automatic hot water operation is stopped. Therefore, the problem that hot water from the hot water supply circuit 8 continues to flow out of the backflow prevention device 22 when the reheating pipe 20 is frozen is solved.

  In this way, when the pouring solenoid valve 21 is in an open state, that is, based on the flow rates detected by the hot water supply flow sensor and the pouring flow sensor during the pouring operation, it is determined whether or not the reheating pipe 20 is frozen. Then, when it is determined that it is frozen, the pouring solenoid valve is closed, and the pouring operation to the reheating circuit is stopped.

(Example 2)
The second embodiment relates to control for determining the closing operation of the pouring electromagnetic valve when it is determined that the reheating pipe 20 is frozen in the first embodiment, and hot water supply is performed when the pouring electromagnetic valve 21 is open. When the flow rate sensor 2 detects a predetermined flow rate or higher and the pouring flow rate sensor 23 detects a predetermined flow rate or lower, the hot water solenoid valve 21 is closed to stop the automatic hot water filling operation. The control means 34 again measures the flow rate flowing through the hot water supply circuit 8 by the hot water supply flow rate sensor 2 that detects the total flow rate provided in the hot water supply circuit 8, and if the flow rate is below a predetermined flow rate, The difference between the flow rate detected by the hot water flow rate sensor 2 and the flow rate detected by the pouring flow rate sensor 23 is determined that the backflow prevention device 22 is operating, and thereafter, the hot water solenoid valve 21 is used. To stop the opening operation of There.

  With this determination operation, automatic hot water filling stop control can be performed more accurately when the backflow prevention device 22 is operated, and hot water from the hot water supply circuit 8 is removed from the backflow prevention device 22 when the reheating pipe 20 is frozen. While solving the problem of continuing to flow out, it is possible to appropriately cope with the case where hot water is used in the currant 1 or the like.

  Further, when the automatic hot water filling operation is stopped by the above-described confirming operation, hot water continues to flow out from the overflow connection port 25 during the automatic hot water operation by notifying the abnormality by the remote control remote controller 10. Can be prevented, and the user can be notified of the occurrence of an abnormality of the device at an early stage.

(Example 3)
In the third embodiment, similar to the first embodiment, when the pouring electromagnetic valve 21 is open, the pouring electromagnetic valve 21 is closed based on the detected flow rates of the hot water flow rate sensor 2 and the pouring flow rate sensor 24. And then performing a series of determination operations for determining the closing operation of the pouring solenoid valve 21 in accordance with the detection current of the hot water supply flow rate sensor 2 for a predetermined number of times, thereby causing a reverse flow due to freezing of the reheating pipe 20 The accuracy of the closing operation of the pouring electromagnetic valve 21 for preventing the outflow of hot water from the prevention device 22 is further ensured. When the pouring electromagnetic valve 21 is open and the hot water supply flow sensor 2 is above a predetermined flow rate. When the pouring electromagnetic valve 21 is closed when the pouring flow rate sensor 23 is equal to or lower than the predetermined flow rate, the detected flow rate of the hot water flow rate sensor 2 that detects the total flow rate provided in the hot water supply circuit 8 is the predetermined flow rate. In the following cases, a predetermined number of times And so as to re-check the detected flow rate of the pouring flow sensor 23 causes the solenoid valve 21 is opening operation, it is possible to reliably detect the flow of hot water from the backflow prevention device 22.

  In addition, when the hot water outflow from the backflow prevention device 22 is reliably detected and the opening operation of the pouring solenoid valve 21 is stopped, that is, the automatic hot water operation is stopped, the remote control remote controller 10 notifies the abnormality. Therefore, it is possible to prevent hot water from continuing to flow out of the machine from the overflow connection port 25 during automatic hot water operation, and to notify the user of the occurrence of an abnormality of the device at an early stage.

Example 4
The fourth embodiment is the same as the first embodiment, in which the pouring solenoid valve 21 is open, the hot water flow rate sensor 2 is equal to or higher than a predetermined flow rate, and the pouring flow rate sensor 23 is equal to or lower than the predetermined flow rate. When the solenoid valve 21 is closed and the detected flow rate of the hot water flow rate sensor 2 for detecting the total flow rate provided in the hot water supply circuit 8 is equal to or higher than a predetermined flow rate, the hot water flow rate sensor 24 is set to a predetermined flow rate or lower. It is determined that the automatic hot water operation and currant hot water were used at the same time, and the standby mode for waiting for the opening operation of the hot water solenoid valve 21 is provided. It becomes possible to prevent deterioration in usability due to a decrease in the amount of hot water.

(Example 5)
In the fifth embodiment, the hot water supply solenoid valve 21 is opened when the hot water flow sensor 2 detects a predetermined flow rate or less in the fourth embodiment, and the automatic hot water operation is resumed immediately after the hot water is used. It becomes possible.

The whole block diagram of the hot-water bath apparatus in one Example of this invention Structure of backflow prevention device in the hot water bath device Configuration diagram showing a conventional hot-water bath device

Explanation of symbols

2 Flow rate sensor for hot water supply 7 Heat exchanger for hot water supply 8 Hot water supply circuit 16 Reheating pipe (reheating circuit)
18 Reheating heat exchanger 19 Reheating return pipe (reheating circuit)
21 Pouring solenoid valve
22 Backflow prevention device 23 Check valve 24 Flow rate sensor for pouring 33 Hot water circulation path (pouring circuit)
34 Control means

Claims (8)

A hot water supply circuit that passes through a heat exchanger for hot water supply, a reheating circuit that passes through a heat exchanger for reheating, a flow rate sensor for hot water that detects the flow rate of the hot water supply circuit, and a hot water solenoid valve that branches from the hot water supply circuit A hot water bath apparatus comprising: a backflow prevention device, a pouring flow rate sensor, a pouring circuit for supplying hot water heated by the hot water heat exchanger to a reheating circuit via a check valve, and a control means When the pouring solenoid valve is in the open state, the control means closes the pouring solenoid valve based on the detected flow rates of the hot water flow rate sensor and the pouring flow rate sensor, and reheats the chasing solenoid valve. Hot water bath equipment that stops pouring water into the circuit. When the pouring solenoid valve is in an open state, the control means detects the pouring solenoid valve when the hot water flow rate sensor detects a predetermined flow rate or higher and the pouring flow sensor detects a predetermined flow rate or lower. The hot water bath apparatus according to claim 1, wherein the hot water pouring operation to the reheating circuit is stopped by closing the door. The control means closes the pouring solenoid valve when the pouring solenoid valve is in the open state, and closes the pouring solenoid valve when the pouring flow sensor detects a predetermined flow rate or more and detects the pouring flow sensor below the predetermined flow rate. A request to stop the pouring operation to the soaking circuit, and again check the detection flow rate of the hot water flow sensor, and if the detected flow rate is less than or equal to the predetermined flow rate, stop the subsequent pouring solenoid valve opening operation Item 3. A hot water bath apparatus according to item 1 or 2. The control means closes the pouring solenoid valve when the pouring solenoid valve is in the open state, and closes the pouring solenoid valve when the pouring flow sensor detects a predetermined flow rate or more and detects the pouring flow sensor below the predetermined flow rate. Stops the pouring operation to the watering circuit and confirms the detection flow rate of the hot water flow rate sensor again. If the detected flow rate is less than the specified flow rate, it stops the subsequent opening operation of the pouring solenoid valve and displays an error at the same time. The hot water bath apparatus according to any one of claims 1 to 3, wherein The control means performs the closing operation of the pouring solenoid valve based on the detected flow rate of the hot water flow sensor and the pouring flow sensor when the pouring solenoid valve is open, and then detects the hot water flow sensor. The hot water bath apparatus according to claim 1 or 2, wherein a series of determination operations of determining a closing operation of the pouring solenoid valve according to an electric current is performed a predetermined number of times. The control means performs the closing operation of the pouring solenoid valve based on the detected flow rate of the hot water flow sensor and the pouring flow sensor when the pouring solenoid valve is open, and then detects the hot water flow sensor. When a series of determination operations for confirming the closing operation of the pouring solenoid valve according to the current is performed a predetermined number of times, if it is determined to be abnormal, the subsequent opening operation of the pouring solenoid valve is stopped and an abnormality is detected. 6. The hot water bath apparatus according to claim 5, wherein display is performed. The control means closes the pouring solenoid valve when the pouring solenoid valve is in the open state, and closes the pouring solenoid valve when the pouring flow sensor detects a predetermined flow rate or more and detects the pouring flow sensor below the predetermined flow rate. While stopping the pouring operation to the watering circuit, again check the detection flow rate of the hot water flow rate sensor, if the detected flow rate is greater than or equal to the predetermined flow rate, until the detected flow rate of the hot water flow rate sensor is lower than or equal to the predetermined flow rate, The hot water bath apparatus according to claim 1 or 2, wherein a standby mode in which the pouring solenoid valve is not opened is set to a standby mode. The hot water bath apparatus according to claim 7, wherein in the standby mode, when the detected flow rate of the hot water flow rate sensor becomes a predetermined flow rate or less, an opening operation of the hot water solenoid valve is started.

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