JP2006328946A - Water communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To early warn and notify a user of damage, by stopping primary side water leakage, even if a diaphragm is damaged, when preventing generation of a backflow, by having a backflow preventive valve for maintaining a valve part for receiving secondary pressure in a valve closing state, by introducing primary pressure to the diaphragm of a pressure receiving part. <P>SOLUTION: Water supply pressure of a water inlet passage 21 is introduced to the pressure receiving part 45 of the backflow preventive valve 4 as the primary pressure by a primary pressure introducing passage 6d. Internal pressure of a hot water filling passage 31 is introduced to the valve part 44 as the secondary pressure. An automatic closing means 64 is interposed in the primary pressure introducing passage. A valve element 645 is stored in a storage chamber 643 in a state of leaving clearance on the periphery, and is maintained in a valve opening state by a spring 646 when water is put in a resting state. When the water in the primary pressure introducing passage flows toward an atmospheric opening port 40 when the pressure receiving part is damaged, the valve element 645 is closed by being pressed to an outlet 642 by differential pressure generated by flowing resistance when passing through the clearance. The valve closing movement is detected by a magnet 674 and a proximity switch 648, and is warned and notified from a remote controller 71. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, for example, a backflow prevention valve is provided in the middle of a water passage that supplies tap water in a continuous state to a supply destination such as a bathtub based on a predetermined supply water pressure (hot water injection). The present invention relates to a water flow device that prevents reverse inflow from a supply destination side to a water supply source side due to generation of negative pressure on the water supply source side.

  Conventionally, as a backflow prevention valve, the valve closed state is maintained by the pressure difference between the pressure on the water supply source side (primary pressure) and the pressure on the supply destination side (secondary pressure), and the valve opens when negative pressure is generated on the water supply source side. Thus, there is known one that prevents backflow by communicating with the atmosphere side. As a water flow apparatus using such a backflow prevention valve, as shown in FIG. 1, a pouring path 31 is branched from a hot water supply path 24 of the water heater 1 and heated in the water heater 1 with respect to the bathtub (or not heated). It is considered to be able to pour hot water and water.

  Explaining the above water flow device, tap water is introduced into the water inlet 21 of the water heater 1 based on the water supply pressure, and this water is heat-exchanged and heated by the heat of combustion from the combustion burner 23 in the heat exchanger 22. The hot water is supplied to the hot water tap at the downstream end through the hot water outlet 24. Further, the pouring passage 31 is branched from the downstream side position of the flow rate adjustment control valve 27 of the hot water passage 24, and the downstream end of the pouring passage 31 directly enters the bottom or side pouring port of the bathtub or the recirculation circulation passage or the like. It is connected to the circulation component which is installed in the bottom part or side part of this and serves also as the pouring gate. A pouring flow rate sensor 32, a pouring electromagnetic valve 33, and a pair of check valves 34 and 35 are interposed in the pouring passage 31. In the backflow prevention valve 4, the pressure in the pouring channel 31 acts as the secondary pressure P <b> 2 from the intermediate position between the pair of check valves 34 and 35 with respect to the valve portion 44 on the distal end side of the piston-like valve body 42. The water supply pressure through the primary pressure introduction path 600 that branches from the downstream position of the water flow rate sensor 26 of the water intake path 21 with respect to the pressure receiving portion (for example, the diaphragm) 45 on the rear end side of the piston-like valve body 42. Are connected so as to act as the primary pressure P1. When the backflow prevention valve 4 is in a normal state, the valve element 42 is closed by the pressure difference between the primary pressure P1 and the secondary pressure P2 (primary pressure P1> secondary pressure P2), and the atmosphere is opened to the atmosphere. As shown in FIG. 2, when the primary pressure P1 becomes equal to or lower than the secondary pressure P2 due to a negative pressure generated due to a power failure or the like on the water supply source side, for example, while the mouth 40 and the pouring passage 31 are always shut off. By opening the valve, the pouring passage 31 and the atmosphere opening 40 are communicated to prevent backflow as described above.

  However, the rubber diaphragm which is the pressure receiving portion 45 of the backflow prevention valve 4 also plays a role of partitioning in a state where the primary side and the secondary side are securely sealed. If perforation or tearing occurs due to the above, etc., the following various inconveniences occur.

  First, there is a risk that water from the water supply source may leak from the atmosphere opening 40 through the primary pressure introduction path 600 (hereinafter referred to as “primary side leakage”).

  Secondly, when the primary side water leakage occurs, the primary pressure P1 decreases accordingly, and as a result, the valve element 42 moves to the valve opening side and passes through the atmosphere opening port 40 to enter the pouring channel 31. Water leakage (hereinafter referred to as “secondary water leakage”).

  Third, when the primary side leakage occurs, the incoming water flow rate sensor 26 detects the occurrence of the incoming water flow rate, and if the detected flow rate is equal to or greater than the minimum operating flow rate, the hot water supply control is started in the water heater 1 as usual. As a result, the combustion of the combustion burner 23 is started. In other words, even if the incoming water flow sensor 26 detects the occurrence of the incoming water flow, the water flows as usual due to the opening operation of the hot water tap or the occurrence of an abnormality such as the primary side water leakage. Therefore, there is a possibility that the combustion burner 23 may be burnt erroneously due to the occurrence of water leakage on the primary side even though the hot-water tap remains closed.

The present invention has been made in view of such circumstances, and an object, stopping the generation of even primary water leakage on SL diaphragm breakage occurs, stops the generation of the primary side leakage In addition, the user is informed of repairs, and even when hot water supply control is accompanied, the occurrence of erroneous control due to the occurrence of primary side leakage is eliminated.

  In order to achieve the above object, the present invention provides a backflow prevention valve interposed at a midway position between the downstream end of a water passage in which a feedwater pressure from a water supply source acts on an upstream end. The valve body, which is mounted so as to be able to move back and forth, receives the pressure in the water passage at the middle position with respect to the valve portion on the front end side, and is upstream of the intermediate position with respect to the pressure receiving portion on the rear end side of the valve body. It is connected so that the valve portion is maintained in a closed state due to the pressure difference received from both the front and rear sides, while the valve portion is opened when the pressure difference is reversed between positive and negative. For the water flow device configured to communicate the water passage with the air opening, various solution means including the following specific items are adopted.

In addition, apart from the present invention (the invention according to any one of claims 1 to 14) that stops the water leakage by the occurrence of water leakage, the reference invention (reference invention 1 to reference invention) that detects the occurrence of water leakage and gives a warning notification 6), the reference invention will be described first .

That is, in the reference invention 1 , the notifying means, the control means for controlling the warning notification by the notifying means, and the feed water pressure introduction path for introducing the feed water pressure to the pressure receiving portion are provided in the feed water pressure introduction path. The water flow detection means for detecting the occurrence of water flow is provided, and the control means is configured to receive an output of water flow detection from the water flow detection means and issue a warning by the notification means.

According to this reference invention 1, when the pressure receiving portion of the backflow prevention valve is damaged, such as perforation or tearing due to deterioration or fatigue, water in the water supply pressure introduction path that is stationary is normal. It will flow from the damaged part to the atmosphere opening side and cause water leakage. Therefore, if the occurrence of flowing water in the water supply pressure introduction path at this time is detected by the flowing water detection means, it is determined that water leakage has occurred, and a warning notification is given by the notification means, so that the user is repaired due to the occurrence of water leakage due to breakage. It becomes possible to recognize that is necessary.

In the reference invention 2 , it is assumed that a notification means and a control means for controlling a warning notification by the notification means are provided. In addition, as the water passage, a heat exchanger and the heat exchanger are provided at an upstream portion thereof. A water supply passage portion, a downstream portion of the heat exchanger, a discharge passage portion, a branch passage branched from the discharge passage portion and extending to the downstream end of the water passage, and passes through the branch passage It is assumed that a branch flow rate detecting means for detecting the branch flow rate to be detected and an open / close switching valve interposed in a branch path at a position downstream of the branch flow rate detection means. Then, the supply water pressure introduction path is branched from an intermediate position between the branch flow rate detecting means and the open / close switching valve, and the branch flow rate detecting means is used as the control means even though the open / close switch valve is closed. When the flow rate is detected, a warning is notified by the notification means.

According to the second aspect of the present invention, when the pressure receiving portion of the backflow prevention valve is damaged such as perforation or tearing due to deterioration or fatigue, the water in the water supply pressure introduction path that is stationary is normal. Will flow from the above-mentioned damaged portion to the atmosphere opening side and cause water leakage. Generation of flowing water in the water supply pressure introduction path due to the occurrence of water leakage is detected by the branch flow rate detection means. At this time, if the flow rate is detected by the branch flow rate detection means even though the open / close switching valve is in the closed state, it is possible to determine that the flow rate of the detected flow rate is flowing into the water supply introduction path. By notifying the warning, it becomes possible for the user to recognize that repair is necessary due to the occurrence of water leakage due to breakage. That is, in the reference invention 2 , it is possible to detect the occurrence of water leakage by utilizing the detection means provided in the water passage without providing any new detection means for detecting the occurrence of water leakage.

In the reference invention 3 , it is assumed that notification means and control means for controlling warning notification by the notification means are provided. Further, as the water flow path, a heat exchanger and a water inlet part to the heat exchanger are provided in the upstream side part thereof, while a hot water path part and the hot water path are provided in the downstream part of the heat exchanger. A branch path section that branches from the section and extends to the downstream end of the water flow path, a branch flow rate detection means that detects a branch flow rate that passes through the branch path section, and a branch path that is downstream of the branch flow rate detection means. And an open / close switching valve mounted thereon. In addition, as the feed water pressure introduction path, the first orifice is branched in the middle from the water inlet section, and the communication path is branched from an intermediate position between the branch flow rate detecting means and the open / close switching valve. A downstream end is connected to a feed water pressure introduction path at a downstream position of the first orifice, and the communication path is a check valve for blocking the flow to the branch path side at a midway position. It is assumed that a second orifice having a large cross-sectional area is interposed. And as said control means, it was set as the structure which alert | reports a warning by the said alerting | reporting means, when the said branch flow rate detection means detects flow volume, although the said on-off switching valve is a valve closing state.

According to this reference invention 3, since the feed water pressure introduction channel is branched from the inlet channel portion, it is more reliably introduced to the pressure receiving portion of the backflow prevention valve from the inlet channel portion on the upstream end side having the highest feed water pressure. In the same manner as in the reference invention 2, it is possible to detect the occurrence of water leakage based on the flow rate detection by the branch flow rate detection means while maintaining the closed backflow prevention valve. That is, since the check valve is provided even if the communication passage is provided, the water passage and the feed water pressure introduction passage are shut off at the normal time, and the first water passage cross-sectional area of the feed water pressure introduction passage is first. It becomes possible to introduce the water supply pressure from the water inlet to the pressure receiving part of the backflow prevention valve through the orifice. On the other hand, when water leaks, the water from the branch passage passes through the communication passage to the pressure receiving part side through the second orifice and the check valve set to have a large water flow cross-sectional area. The occurrence is accurately detected.

The reference invention 4 further includes a notifying means and a control means for controlling warning notification by the notifying means, and as the water passage, a heat exchanger and a water inlet portion to the heat exchanger are provided at an upstream portion thereof. On the other hand, a downstream portion of the heat exchanger is provided with a hot water passage portion and a branch passage that branches from the hot water passage portion and extends to the downstream end of the water passage. And as the said feed water pressure introduction path, it shall be equipped with the temperature detection means which branches from the hot water supply path part of the downstream position of the said heat exchanger, and detects the temperature in a feed water pressure introduction path, As said control means Then, when it is determined that a predetermined temperature rise fluctuation has occurred based on the temperature detection output from the temperature detection means, a warning is notified by the notification means.

According to this reference invention 4, when damage such as perforation or tearing occurs in the pressure receiving part of the backflow prevention valve due to deterioration or fatigue, the hot water heated by the heat exchanger or the residual heat causes more than other parts. High-temperature water moves from the tap water passage portion to the pressure receiving portion side through the supply water pressure introduction passage. For this reason, the temperature detected by the temperature detector rises while drawing a predetermined temperature rise curve. By detecting this temperature rise fluctuation, it can be determined that water leakage has occurred due to the occurrence of the above-mentioned breakage, and by notifying the warning by the notification means, it is necessary to repair the user for the occurrence of water leakage due to breakage. Can be recognized.

In the reference invention 5 , it is provided with a notification means and a control means for controlling warning notification by the notification means, and as the water passage, a heat exchanger, and a water inlet portion to the heat exchanger, in the upstream side portion thereof, Suppose that it is provided with the incoming flow rate detection means interposed in this incoming passage part. Then, the feed water pressure introduction channel is branched from the inlet channel portion at the downstream side of the incoming water flow rate detecting means, and the operation switch of the heater for heating the heat exchanger is turned off as the control means. Regardless, when the flow rate detection means detects the flow rate or when the flow rate detection state continues for a predetermined time, the notification means notifies the warning.

According to this reference invention 5, when the pressure receiving portion of the backflow prevention valve is damaged due to deterioration, fatigue, or the like, water that has passed through the incoming flow rate detecting means in the inlet passage portion is introduced into the supply pressure. Since it flows into the channel and flows in the feed water pressure introduction channel toward the pressure receiving part, the flow rate is detected by the incoming water flow rate detecting means. At this time, if the operation switch of the heater is in the OFF state, it is not the movement of water based on the intention of using hot water supply, so it is determined that some abnormality has occurred. For this reason, it is possible to notify the user that the repair is necessary due to the occurrence of water leakage due to breakage by notifying the warning by the notification means. In addition, as a warning notification content, if a hot water tap is provided on the downstream side of the heat exchanger, first the warning notification that the water tap has been forgotten to be closed or loose has occurred. If the flow rate detection continues for a predetermined time, a warning notification that there is a risk of water leakage may be performed. In the above reference invention 5, it is possible to detect the occurrence of water leakage by utilizing the incoming water flow rate detection means provided in the water passage without providing any new detection means for detecting the occurrence of water leakage.

In the reference invention 6 , a notification means and a control means for controlling warning notification by the notification means are provided, and as the water passage, a heat exchanger and a water inlet portion to the heat exchanger are provided in an upstream portion thereof. The inlet water temperature detecting means interposed in the inlet water path section is provided, and the feed water pressure introduction path is branched from the inlet water path section at a position downstream of the inlet water temperature detecting means. In addition, the incoming water temperature detection means is constituted by a self-heating type thermistor, and in addition to temperature detection, it is possible to detect the generation of running water by temperature change during self-heating. And as said control means, although the operation switch of the heater which heats the said heat exchanger is in an OFF state, when the said incoming water temperature detection means detects generation | occurrence | production of flowing water, the structure which alert | reports warning by the said notification means It was.

According to the Reference Invention 6, also by using the incoming water temperature detecting means in place of the incoming water flow rate detecting means references invention 5, so that the effect similar to that of the Reference Invention 5 is obtained. That is, when breakage or the like occurs in the pressure receiving portion of the backflow prevention valve, the water that has passed through the water inlet temperature detecting means in the water inlet passage flows into the water supply pressure introduction passage and flows in the water supply pressure introduction passage toward the pressure receiving portion. For this reason, the occurrence of flowing water is detected by the self-heating operation to the incoming water temperature detecting means. This is because if the water is stationary, the temperature will be lowered due to heat transfer to the still water even if the water is self-heated, but if flowing water is generated, the heat of the self-heating will be taken away and the temperature will drop rapidly. At this time, if the operation switch of the heater is in the OFF state, it is not the movement of water based on the intention of using hot water supply, so it is determined that some abnormality has occurred. For this reason, it is possible to notify the user that the repair is necessary due to the occurrence of water leakage due to breakage by notifying the warning by the notification means. In addition, as the warning notification, first notify the warning that the water tap has been forgotten to be closed or loosened, and if the above water flow detection continues, the warning notification that there is a risk of water leakage will be performed. This may be the same as in Reference Invention 5. Also in the above reference invention 6, it becomes possible to detect the occurrence of water leakage by utilizing the incoming water temperature detection means provided in the water passage without providing any new detection means for detecting the occurrence of water leakage.

Next, in the invention according to claim 1 as a solving means, an automatic closing means interposed in a feed water pressure introduction path for introducing a feed water pressure to the pressure receiving portion is provided, and the feed water pressure introduction path is provided as the automatic closing means. While the filled water was stationary, the water supply introduction path was maintained in a communicating state, while a closing member that moved by the generation of running water to close the water supply introduction path was provided.

According to the first aspect , when breakage or the like occurs in the pressure receiving portion of the backflow prevention valve, the water in the water supply pressure introduction path flows to the pressure receiving portion side through the automatic closing means maintained in the communication state. Therefore, the closing member is moved by the flowing water to close the feed water pressure introduction path. For this reason, the movement of water in the feed water pressure introduction path is stopped, and there is no subsequent water leakage. As such an automatic closing means, a piston-like valve inserted with a slight gap left along the inner cross-section of the feed water pressure introduction passage is used as a closing member, and upstream and downstream are generated by the generation of flowing water through the slight gap. That is moved to the closing side by the differential pressure generated on the side, or a ball member that is stationary in a chamber whose diameter is expanded in a part of the feed water pressure introduction path is used as the closing member, and the diameter-expanding chamber and the downstream side when the flowing water is generated What is necessary is just to employ | adopt the thing etc. which move a ball member so that it may draw near to the closing side by the change of the flow velocity with this water supply pressure introduction path.

In the water flow device according to claim 1 , after the automatic closing (automatic shutoff) of the water supply pressure introduction path accompanying the occurrence of water leakage, the user is informed that repair is necessary for the occurrence of water leakage due to breakage. You may make it perform the alert alert | report for making it. Any of the following can be adopted as means for realizing such warning notification.

As the first means, and distribution knowledge means for warning notification water leakage caused by breakage of the pressure-receiving portion of the check valve to a user, a movement detection means for detecting a movement of the closing side of the closing member, the movement Control means for receiving an output of movement detection from the detection means and notifying the warning by the notification means (claim 2 ). Here, the movement detection means is constituted by, for example, a combination of a magnet and a proximity switch that detects a magnetic flux line of the magnet, and the magnet is embedded in the closing member, while on the inside or outside of the water supply pressure introduction path. The proximity switch may be provided at the closing position of the closing member.

As the second means, and distribution knowledge means for warning notification water leakage caused by breakage of the pressure-receiving portion of the check valve to the user, a leak detection means for detecting the occurrence of water leakage from the atmosphere opening port, the leakage Control means for receiving an output of water leakage detection from the detection means and causing the notification means to issue a warning (claim 3 ).

As the third means, the distribution knowledge means to alert notifying the user of the water leakage caused by breakage of the pressure-receiving portion of the check valve, movement detection for detecting the movement of the valve opening side of the valve body of the check valve And a control means for receiving a movement detection output from the movement detection means and causing the notification means to issue a warning (Claim 4 ). Here, the movement detection means is constituted by a combination of, for example, a magnet and a proximity switch for detecting a magnetic flux line of the magnet, as in the first means, and the valve body is embedded with the magnet. The proximity switch may be provided inside or outside the housing for housing the valve body at the valve opening position.

In the invention according to claim 5 , the on-off switching valve interposed in the feed water pressure introduction path for introducing the feed water pressure to the pressure receiving portion and maintained in a normally open state, and the occurrence of water leakage from the atmosphere opening are detected. And a control means for receiving the output of the water leak detection from the water leak detection means and switching the open / close switching valve to the closed state.

According to the fifth aspect of the present invention , the water supply pressure is introduced into the pressure receiving portion through the water supply pressure introduction path while the open / close switching valve is kept open at all times, that is, in a normal state. On the other hand, when water leakage detection is performed by the water leakage detection means due to breakage of the pressure receiving portion or the like, the opening / closing switching valve is closed by the control means and switched to the valve closed state. As a result, the water supply pressure introduction path is blocked, and it becomes possible to eliminate subsequent water leakage. As such an on-off switching valve, either a normal electromagnetic on-off valve or an electromagnetic three-way on-off valve may be used.

The water flow device of claim 5 may further comprise a notifying means, and the control means may be configured to issue a warning notification by the notifying means when the on-off switching valve is switched to a closed state (claim 6 ). . This makes it possible for the user to recognize that water leakage has occurred and that repair is necessary.

Here, as the water leakage detection means in claim 3 or claim 5 , water detection using an electrode rod or water detection using a self-heating type thermistor may be employed. Moreover, when providing said water leak detection means in an air release port, it is preferable to arrange | position as follows. That is, a pair of bank portions extending in the direction of water leakage and projecting upward are formed on the upper surface of the bottom wall in the passage constituting the atmosphere opening, and the water leakage detecting means is sandwiched between the pair of bank portions. It is exposed and arranged in the lowest part (Claim 7 ). By doing in this way, even if there is a slight amount of water leakage, it becomes possible to accurately detect the occurrence of water leakage.

According to an eighth aspect of the present invention, an automatic closing means interposed in a feed water pressure introduction path for introducing a feed water pressure to the pressure receiving portion is provided, and the inside of the feed water pressure introduction path is shut off as the automatic closing means. The piston valve is movably inserted while being moved, and the stopper is formed in the feed water pressure introduction path so as to stop the piston valve at the backflow prevention valve side position.

According to the eighth aspect of the invention , although the water in the feed water pressure introduction path is divided on both the upstream and downstream sides across the piston valve, the feed water pressure is set to the downstream side via the piston valve in the normal state. As a result, the feed water pressure can be applied to the pressure receiving portion of the check valve. On the other hand, if the pressure receiving part is damaged such as tearing and water leakage occurs, the piston valve is pushed downstream in accordance with the water leakage and stops against the stopper part. Thereby, it becomes possible to eliminate the subsequent water leakage.

In the water flow device according to the eighth aspect , the notification unit, the movement detection unit for detecting the movement of the piston valve toward the stopper portion, and the movement detection output from the movement detection unit receive the notification. Control means for notifying the warning by means may be provided (claim 9 ). This makes it possible for the user to recognize that water leakage has occurred and that repair is necessary. In addition, as said movement detection means, it is comprised, for example with the combination of a magnet and the proximity switch which detects the magnetic flux line of this magnet, and what is necessary is just to use these as demonstrated in the case of Claim 2 .

In the invention which concerns on Claim 10 , the heat exchanger interposed in the upstream part of the said water flow path, the flow regulating valve with a closing function of the downstream, the control means which controls this flow regulating control valve, It is assumed that temperature detection means is provided which is interposed in the feed water pressure introduction path and detects the temperature in the feed water pressure introduction path. Then, a supply water pressure introduction path for introducing a supply water pressure to the pressure receiving portion is branched from a downstream position of the flow rate adjustment control valve, and a predetermined temperature increase is performed as the control means based on a temperature detection output from the temperature detection means. The flow rate control valve is closed when it is determined that fluctuation has occurred.

According to the tenth aspect , when breakage or the like occurs in the pressure receiving part of the backflow prevention valve, the hot water heated by the heat exchanger or the remaining heat causes water higher in temperature than the other part to pass through the water supply pressure introduction path. Will move to the side. For this reason, the temperature detected by the temperature detecting means rises in a predetermined temperature rise curve as described in the case of claim 4. By detecting this temperature rise variation, it can be determined that water leakage has occurred due to the occurrence of the above-mentioned breakage, and by closing the flow rate adjustment control valve by the control means, the inflow of water to the water supply pressure introduction path is stopped. Then, it becomes possible to eliminate the subsequent water leakage. In the case of this claim 10, the flow adjustment control valve provided in the water passage is utilized without newly providing a closing means for stopping the flow of water in the water supply pressure introduction passage. It becomes possible to realize water leakage stop.

The water flow device according to claim 10 further includes notification means, and as the control means, a warning is notified by the notification means when the flow rate adjustment control valve is closed based on a temperature detection output from the temperature detection means. May be added (claim 11 ). By notifying the warning by the notification means, the user can be made aware that repair is necessary due to the occurrence of water leakage due to breakage.

Among the above inventions, in the water flow apparatus according to any one of claims 1 to 9 , as the water flow path, a heat exchanger on the upstream side, a water flow path part to the heat exchanger, and the water flow path part When the water supply flow rate detecting means is provided in the water supply pressure detecting means, it is preferable that the water supply pressure introduction path is branched from the water inlet path portion at the upstream side of the water flow rate detecting means ( Claim 12 ). By doing so, even if water leakage occurs due to breakage of the pressure receiving part and flowing water is generated in the feed water pressure introduction path, the flowing water does not pass through the incoming flow rate detecting means. Therefore, even if automatic control of the heater with respect to the heat exchanger is performed, the erroneous control can be prevented.

Also, more than in any of the water passing apparatus of claims 1 to 12, a filter to a position upstream than the middle position of the water channel-side position or the flow passage of the valve portion of the check valve You may make it interpose (claim 13 ). By doing in this way, it is possible to reliably prevent foreign matter and the like from flowing into the valve portion side of the valve body of the backflow prevention valve, and avoid the occurrence of valve closing abnormalities due to any foreign matter biting. It becomes possible. This ensures the maintenance of the closed state of the check valve.

According to the fourteenth aspect of the present invention, the passage resistance means is provided in a water supply pressure introduction path for introducing a water supply pressure to the pressure receiving portion and restricts the passage of water in the water supply pressure introduction path to a predetermined minimum flow rate or less. It was decided to prepare.

According to the fourteenth aspect of the present invention, it is assumed that the pressure receiving portion of the backflow prevention valve is broken or damaged, and water in the water supply pressure introduction path flows to the atmosphere opening port side through the damaged portion of the pressure receiving portion. However, since the flow rate of the flowing water in the water supply pressure introduction path is limited to a predetermined minimum flow rate or less by the passage resistance means, it is possible to minimize the damage caused by the occurrence of water leakage.

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As described above , according to the water flow device of the first aspect, even if the pressure receiving portion of the backflow prevention valve is damaged, such as a tear, the water supply pressure introduction path is automatically closed by the automatic closing means along with the occurrence of the damage. It can be closed and shut off, thereby stopping the movement of water in the feed water pressure introduction path and eliminating the subsequent occurrence of water leakage.

According to the second aspect , the occurrence of the automatic shut-off in the first aspect can be grasped by the movement detecting means of the closing member, and the user can be warned by the notifying means based on this grasp.

According to the third aspect , in addition to the automatic shut-off according to the first aspect , the warning means can be notified to the user by the notifying means based on the water leak detection by the water leak detecting means.

According to the fourth aspect , in addition to the automatic shut-off according to the first aspect, based on the detection of the movement of the backflow prevention valve to the valve opening side by the movement detection means, the warning means can be notified to the user by the notification means. it can.

According to the water flow device of claim 5 , even if water leakage occurs due to breakage or the like in the pressure receiving portion of the backflow prevention valve, the open / close switching valve can be closed by the water leakage detection by the water leakage detection means, Thereby, a water supply pressure introduction path can be interrupted | blocked and subsequent water leakage can be eliminated. According to the sixth aspect , based on the closing operation of the open / close switching valve according to the fifth aspect, a warning can be given to the user by the notifying means.

According to claim 7, in claim 3 or claim 5, even water leakage even small amount generated, it is possible to detect the occurrence of the water leakage accurately.

According to the water flow device of the eighth aspect, the water supply pressure is reliably introduced into the pressure receiving portion by the water supply pressure introduction path, and even if the pressure receiving portion is damaged such as tearing and water leakage occurs, the water is supplied by the piston valve. The water pressure introduction path can be automatically closed, thereby preventing subsequent water leakage. According to the ninth aspect of the present invention , the automatic closing by the piston valve can be detected based on the movement detection from the movement detection means, and a warning can be notified to the user by the notification means based on this detection.

According to the water flow device of the tenth aspect , it is possible to grasp the occurrence of water leakage due to the occurrence of breakage or the like in the pressure receiving portion of the backflow prevention valve based on the temperature detected by the temperature detecting means, and based on this grasping, the flow rate control valve Can be controlled. Thereby, the inflow of water to the feed water pressure introduction path can be stopped, and the subsequent water leakage can be eliminated. In this case, water leakage stop is realized by utilizing the flow rate control valve provided in the water passage without newly providing a closing means for stopping the flow of water in the water supply pressure introduction passage. Can do. According to the eleventh aspect , in addition to the closing control, a warning can be notified to the user by the notification means.

According to Claim 12 , in the water flow device according to any one of Claims 1 to 9 , the water pressure introduction path is branched from the water inlet part at the upstream position of the incoming water flow rate detecting means, thereby causing the pressure receiving part to be broken. Even if water leakage occurs and water flows in the water supply pressure introduction path, it is possible to prevent the flow rate detection by the incoming flow rate detection means, and automatic control of the heater with respect to the heat exchanger is performed. However, it is possible to prevent the erroneous control.

According to claim 13 , in the water flow device according to any one of claims 1 to 12 , it is ensured that foreign matter or the like flows into the valve portion side of the valve body of the check valve by the interposition of the filter. It is possible to prevent the occurrence of valve closing abnormalities due to the occurrence of foreign object biting. Thereby, it is possible to ensure the maintenance of the closed state of the check valve.

According to the fourteenth aspect , even if the pressure receiving portion of the backflow prevention valve is broken or damaged, the water in the feed water pressure introduction path flows to the atmosphere opening port side through the damaged portion of the pressure receiving portion, and water leakage occurs. Since the flow rate of the flowing water in the water supply pressure introduction path is limited to a predetermined minimum flow rate or less by the passage resistance means, damage due to the occurrence of water leakage can be minimized. In particular, when a heat exchanger and a heater for heating the heat exchanger are provided on the water passage, and the heater has a hot water supply control in which combustion is started by entering water exceeding the minimum operating flow rate, the feed water pressure introduction path is connected to the heat exchanger. Even if it is branched from the downstream side position of the incoming water flow rate detecting means, by setting the minimum flow rate below the minimum operating flow rate, it is possible to reliably avoid the occurrence of erroneous control due to the hot water supply control even if water leakage occurs. be able to.

Hereinafter, the embodiments of the present invention will be described with reference to FIG surface with reference embodiment Description of the premise construction includes a prerequisite configuration have been made.

<First Reference Form>
FIG. 3 shows a first reference embodiment in which the water flow device of Reference Invention 1 is applied to a hot water heater with a hot water filling function, 2 is a hot water supply circuit that realizes a hot water supply function, and 3 is the hot water supply circuit 2 with a bathtub as a hot water filling point. A pouring circuit that realizes a filling function by allowing hot water from the hot water to be poured into the bathtub, 4 is a backflow prevention valve interposed in the middle of the pouring circuit 3, and 5 is one end of the backflow prevention valve 4. A secondary pressure introduction path that communicates with the pouring circuit 3 and introduces the internal pressure in the pouring circuit 3 as a secondary pressure, and 6 is a primary pressure that introduces the feed water pressure as the primary pressure to the other end of the check valve 4. An introduction path 7 is a controller as control means. The primary pressure introduction path 6 constitutes a “water supply pressure introduction path”, and the bathtub constitutes a “water supply path supply destination”.

  The hot water supply circuit 2 uses the water introduced from a water inlet 21 connected to a water pipe as a water supply pressure or a predetermined reduced pressure original pressure as the water supply pressure, and the heat of combustion in the combustion burner 23 as a heater in the heat exchanger 22. The hot water after heating is heated to the hot water tap (not shown) at the downstream end through the hot water outlet 24. A bypass passage 25 is provided between the water inlet passage 21 and the hot water passage 24, and temperature adjustment to the set temperature is performed by water mixing adjustment control by the adjustment valve 25a. The hot-water tap is composed of, for example, a currant disposed in a kitchen or the like, or a shower currant disposed in a bathroom or a washstand. In addition, although the said heat exchanger 22 is simply displayed in the example of a figure, it is actually comprised by the fin pipe by which the pipe was folded back several times.

  An incoming water temperature sensor (not shown) and an incoming water flow rate sensor 26 as an incoming water flow rate detecting means are disposed in the incoming water passage 21, and the hot water supply passage 24 is supplied to the hot water tap or the pouring circuit 3. A flow rate adjustment control valve 27 for adjusting the flow rate of hot water is provided. The controller 7 performs hot water supply control for controlling the combustion of the combustion burner 23 so that the hot water supply temperature and the pouring temperature become a predetermined set temperature. As the flow rate adjustment control valve 27, in this first embodiment, either a type with a closing function that can be fully closed to shut off the hot water outlet 24, or a type that cannot be fully closed, either. It may be configured.

  The pouring circuit 3 includes a pouring passage 31 whose upstream end is branched from the downstream side of the flow regulating valve 27 and whose downstream end is communicated with a bathtub (not shown). In addition, as this pouring channel 31, in addition to the downstream end of which is directly connected to the bottom or side pouring port of the bathtub, there is a recirculation circuit for reheating the bath water. In communication with any position of the recirculation circuit, the final downstream end via this recirculation circuit is installed at the bottom or side of the bathtub and indirectly to the circulation part that also serves as a pouring gate. Includes connected ones. In the pouring channel 31, a pouring flow rate sensor 32 that detects the pouring flow rate in order from the upstream side, a pouring electromagnetic valve 33 that is controlled to be opened and closed by the controller 7 and switches between pouring and shutting off, Two-stage check valves 34 and 35 each having a structure that allows only flow to the bathtub side are provided. Based on the detection value from the pouring flow rate sensor 32, the controller 7 grasps the amount of hot water filling the bathtub.

Or Te odor, the "ON waterway section" is input waterway 21, by "tapping path portion" is tapping line 24, "the branch path portion" is respectively made Chuyuro 31, these input waterway 21, hot water passage 24 and the The pouring channel 31 constitutes a “water passage”, and the bathtub constitutes a “supply destination” by this water passage.

  The secondary pressure introduction path 5 is branched from an intermediate position between the pair of check valves 34 and 35 of the pouring path 31 (a middle position of the water passage), and the primary pressure introduction path 6 is a water flow rate sensor of the water inlet 21. 26 is branched from a position upstream from 26.

  As shown in detail in FIG. 4, the backflow prevention valve 4 includes a first housing 41a having an atmosphere opening 40 and a secondary pressure introduction port 411, a second housing 41b at an intermediate position, a primary pressure introduction port 412 and A housing 41 configured by a third housing 41c having a fine hole 413 and defining an accommodation chamber 414 therein, a piston-like valve element 42 accommodated in the accommodation chamber 414 so as to move back and forth, and the valve element 42 And a spring 43 set with a considerably weak spring load S in order to bias the spring. A valve portion 44 for opening and closing the secondary pressure introduction port 411 is provided on the front end side of the valve body 42, and the primary pressure is supplied to the rear end side while water-tightly dividing the primary pressure introduction port 412 side and the storage chamber 414. A receiving pressure part 45 is provided. The pressure receiving portion 45 may be of any material and structure as long as it has a flexibility that can follow the back and forth movement of the valve body 42 while exhibiting sealing properties. A diaphragm made of rubber or a bellows made of rubber is used.

  The secondary pressure introduction port 411 is connected to the secondary pressure introduction path 5, the secondary pressure P <b> 2 acts on the valve portion 44, and the primary pressure introduction port 412 is connected to the primary pressure introduction path 6. The primary pressure P1 acts on the pressure receiving portion 45, and the valve body 42 is pressed to the valve closing side (upward movement side in FIGS. 3 and 4) based on the differential pressure between the two pressures, and the atmosphere is opened to communicate with the storage chamber 414. The mouth 40 and the pouring channel 31 are maintained in a state of being blocked from each other.

  More specifically, in a pouring state in which the pouring solenoid valve 33 is opened and pouring into the bathtub through the pouring passage 31, the primary pressure P <b> 1 is the water supply pressure (dynamic pressure) from the upstream end side of the inlet passage 21. In contrast, the secondary pressure P2 is more than the above-mentioned feed water pressure due to repeated folding in the heat exchanger 22 and pressure loss while passing through the flow rate adjustment control valve 27, the pouring electromagnetic valve 33, etc. The pressure has dropped considerably. Thus, P1> P2 + S (spring load) is established, and the valve body 42 is maintained in a state where the valve portion 44 is pressed to the closed state by the differential pressure between them and the secondary pressure introducing port 411 side is closed. . On the other hand, in the pouring standby state in which the pouring electromagnetic valve 33 is closed and shut off until there is a pouring command to the bathtub, the primary pressure P1 is a considerably high water supply pressure (from the upstream end side of the water inlet 21). In contrast, the secondary pressure P2 is the pressure of the water sealed between the pair of check valves 34 and 35 while maintaining the substantially atmospheric pressure state on the bathtub side in the pouring state until then. Yes. As a result, P1 >> P2 + S is established, and the valve closed state is maintained as described above.

  On the other hand, when the primary pressure P1 decreases due to, for example, the occurrence of a power failure or becomes a negative pressure state and the pressure balance becomes P1 <P2 + S, the valve body 42 is opened on the valve side as shown in FIG. The valve portion 44 opens. For this reason, the secondary pressure introduction path 5 communicates with the atmosphere opening port 40, and the water in the pouring channel 31 is discharged from the atmosphere opening port 40. Thereby, when the hot water supply circuit 2 side falls into a negative pressure state, the reverse inflow from the bathtub side to the hot water supply circuit 2 side is prevented through the pouring channel 31.

In the process where the primary pressure falls into the negative pressure state, the valve body 42 reduces the spring load (open biasing force) S of the spring 43 when the primary pressure and the secondary pressure become the same pressure (P1 = P2). Upon receipt, the valve opens early. That is, the valve is opened immediately before the occurrence of the reverse flow, thereby preventing the occurrence of reverse inflow to the hot water supply circuit 1 side.

Further, in FIG. 3, reference numeral 51 denotes a filter interposed in the secondary pressure introduction path 5, and this filter 51 may be included in the pouring passing through the pouring path 31, for example, an inner wall deposit on the heat exchanger 22. The separation pieces and the like are filtered to prevent the foreign matter biting of the valve portion 44 of the backflow prevention valve 4 from occurring. In addition, although not shown in each reference form and each embodiment after the second reference form, the filter 51 may be provided.

  In the above structure, the water flow detecting means 61 is interposed in the primary pressure introduction path 6, and when the water flow is detected, the water flow detection is output to the controller 7. As such flowing water detection means 61, for example, a water flow switch, a flow sensor, or a self-heating type thermistor is used. The principle when the self-heating thermistor is used as the flowing water detection means 61 will be briefly described. If the water in the primary pressure introduction path 6 is stationary, the temperature detected when the water is self-heated is the water temperature Tw. The temperature Ta is obtained by adding the self-heating value Ts. However, if flowing water is generated, the temperature is detected even if self-heating is generated, and thus the detected temperature is lower than Ta. Thereby, it is possible to detect whether or not running water is generated, that is, running water detection.

  When the pressure receiving part 45 is deteriorated or fatigued and the pressure receiving part 45 is perforated, torn, cracked, etc., the flowing water in the primary pressure introducing path 6 passes through the damaged part to the primary pressure introducing path 6 side. Is generated when the water flows into the storage chamber 414 and flows out from the atmosphere opening 40 as water leakage. Therefore, by detecting the flowing water by the flowing water detection means 61, it is possible to detect the occurrence of water leakage due to the breakage of the pressure receiving portion 45.

  When the water flow detection means 61 outputs the water flow detection, the controller 7 gives a warning sound and warning to the remote control 71 that also functions as a notification means that the backflow prevention valve 4 is leaking. A command for notification is issued by any one or combination of lighting / flashing of a lamp or guidance display on the display unit 711. This warning notification allows the user to recognize that the backflow prevention valve 4 needs to be repaired and prompt the repair.

  In addition, since the primary pressure introduction path 6 is branched from the upstream position of the incoming water flow sensor 26, even if water leaks due to the breakage of the pressure receiving portion 45 and the flowing water occurs in the primary pressure introduction path 6, The flowing water does not pass through the incoming water flow sensor 26, and therefore, the flow detection by the incoming water flow sensor 26 is not performed. For this reason, in the case of FIG. 1, it is possible to avoid the occurrence of erroneous hot water supply control in which the incoming water flow rate is detected due to the occurrence of water leakage and the combustion burner 23 is operated for combustion if it exceeds the minimum operating flow rate.

<Second Reference Form>
FIG. 6 shows a second reference form in which the water flow device of Reference Invention 2 is applied to a hot water heater with a hot water filling function, and 8 is a primary pressure for introducing a feed water pressure as a primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and this primary pressure introduction path 8 constitutes a “feed water pressure introduction path”. In addition, since the other component of the said 2nd reference form is the same structure as the thing of the 1st reference form, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted. In the following reference embodiments and embodiments, the same components as those in the first reference embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The primary pressure introducing path 8 is branched from a pouring path 31 between the pouring flow rate sensor 32 and the pouring electromagnetic valve 33, and the primary pressure P1 introduced by the primary pressure introducing path 8 and the secondary pressure. The relationship with the secondary pressure P2 introduced to the valve portion 44 side of the check valve 4 by the introduction path 5 is based on the pressure loss when the P1 passes through the pouring electromagnetic valve 33 and the upstream check valve 34. The pressure drop is the differential pressure.

In the case of this second reference embodiment, when the pressure receiving part 45 is damaged, when water in the primary pressure introduction path 8 leaks from the atmosphere opening 40, a molten metal flow rate sensor is provided in the primary pressure introduction path 8 accordingly. Water in the pouring channel 31 from the downstream side of 32 flows in, and the flow rate of the flowing water is detected by the pouring flow rate sensor 32.

Therefore, when the flow rate detection from the pouring flow rate sensor 32 is output in the controller 7 even though the pouring solenoid valve 33 controlled by the controller 7 is closed, the pressure receiving pressure is received. It is determined that water leakage due to breakage of the portion 45 has occurred, and a warning notification command similar to that in the first reference embodiment is output to the remote controller 71 as notification means.

  Further, the flow rate adjustment control valve 27 disposed upstream of the branch point between the pouring passage 31 and the primary pressure introduction passage 8 is configured as a type with a closing function, and the opening range from fully closed to fully open. In the case where the passage flow rate can be adjusted, the controller 7 may perform the operation control for switching the flow rate adjustment control valve 27 to the fully closed state together with the warning notification from the remote controller 71. Thereby, the supply of water to the primary pressure introduction path 8 is shut off, and as a result, the subsequent water leakage from the atmosphere opening 40 can be stopped.

The point of closing the flow rate adjustment control valve 27 is the embodiment according to claim 10 or claim 11 .

<Third Reference Form>
FIG. 7 shows a third reference form in which the water flow device of Reference Invention 3 is applied to a water heater with a hot water filling function, and 6a is a primary pressure for introducing a feed water pressure as a primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and a first orifice 62 is interposed at an intermediate position. The primary pressure introduction path 6a constitutes a “feed water pressure introduction path”. 8a has one end communicating with the pouring passage 31 between the pouring flow rate sensor 32 and the pouring electromagnetic valve 33, and the other end downstream of the first orifice 62 (position on the backflow prevention valve 4 side). ) And a second orifice 81 and a check valve 82 are interposed in the middle position.

  The first orifice 62 is set to a small passage sectional area, and the second orifice 81 is set to a large passage sectional area. That is, the first orifice 62 is set to have a passage cross-sectional area that is as small as possible with respect to the pressure receiving portion 45 of the check valve 4 as a primary pressure, and the second orifice 81 is caused by damage to the pressure receiving portion 45. When a flow toward the pressure receiving portion 45 occurs, the first orifice 62 is in a water-impervious state, and the passage cross-sectional area is larger than the first orifice 62 so that only the second orifice 81 can be in a water-permeable state. Is set. The check valve 82 allows only water flow from the pouring channel 31 to the primary pressure introduction channel 6a side, while blocking water flow in the reverse direction.

In the third reference embodiment, in a normal state in which the pressure receiving part 45 is not damaged, the primary pressure is introduced into the pressure receiving part 45 via the primary pressure introduction path 6a, whereby the check valve 4 is closed. Maintained. On the other hand, when the pressure receiving part 45 is damaged and water leaks from the atmosphere opening 40, water in the pouring channel 31 moves to the pressure receiving part 45 side and flows through the communication path 8a. For this reason, in the controller 7, as in the case of the second embodiment, it is determined that water leakage has occurred based on the flow rate detection by the pouring flow rate sensor 32, and warning notification by the remote controller 71 is executed. As a result, it is possible to notify the user of the occurrence of water leakage and prompt measures such as repair.

The form using the first and second orifices 62 and 81 in the third reference form is particularly effective when the pressure receiving portion 45 breaks at a stretch.

<4th reference form>
FIG. 8 shows a fourth reference embodiment in which the water flow device of Reference Invention 4 is applied to a hot water heater with a hot water filling function, and 9a is a primary pressure for introducing a supply water pressure as a primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and a temperature sensor 91 as a temperature detecting means is interposed in the middle position. The primary pressure introduction path 9a constitutes a “feed water pressure introduction path”.

  The primary pressure introduction path 9a is branched from the downstream side position of the heat exchanger 22 of the hot water supply circuit 2. If the pressure receiving part 45 is damaged and water leaks from the air opening 40, the heat exchanger 22 heats the primary pressure introduction path 9a. The heated water flows into the primary pressure introduction path 9a.

  For this reason, when the water leakage occurs, the temperature detected by the temperature sensor 91 rises rapidly because the hot water heated by the heat exchanger 22 flows in, and the controller 7 receiving the output of the detected temperature detects the above temperature. The occurrence of water leakage can be determined and detected by the occurrence of a rapid rise in temperature. Then, when the occurrence of water leakage is detected, a warning notification is executed by the remote controller 71, thereby informing the user that water leakage has occurred and prompting measures such as repair.

In the case of this reference form, instead of the temperature detection means 91, a water flow detection means 61 similar to that of the first reference form is interposed in the primary pressure introduction path 9a so that the occurrence of water leakage is determined and detected by water flow detection. May be.

<5th reference form>
FIG. 9 shows a fifth reference embodiment in which the water flow device of the reference invention 4 is applied to a hot water heater with a hot water filling function, and 9b is a primary pressure for introducing a feed water pressure as a primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and a temperature sensor 91 as a temperature detecting means is interposed in the middle position. The primary pressure introduction path 9b constitutes a “feed water pressure introduction path”. The fifth reference embodiment is suitably applied when the flow rate adjustment control valve 27 is configured as a type with a closing function.

The primary pressure introduction passage 9b is branched from the pouring passage 31 at the downstream side of the heat exchanger 22 of the hot water supply circuit 2 and at the downstream side of the flow rate control valve 27, and the pressure receiving portion 45 is damaged. If leakage occurs from the atmosphere opening port 40 Te, fourth reference embodiment and hot water which is heated as well in the heat exchanger 22 is adapted to flow into the primary pressure introduction passage 9b.

For this reason, when the water leakage occurs, the temperature detected by the temperature sensor 91 rises rapidly because the hot water heated by the heat exchanger 22 flows in, as in the fourth reference embodiment. The received controller 7 can determine and detect the occurrence of water leakage due to the sudden rise in the detected temperature. Then, upon detection of the occurrence of water leakage, warning notification is executed by the remote controller 71 and operation control for switching the flow rate adjustment control valve 27 to the fully closed state is performed. Thereby, after stopping the subsequent water leakage from the air opening 40, the user can be informed of the occurrence of the water leakage and prompt measures such as repair.

In the case of this reference form, instead of the temperature detection means 91, a water flow detection means 61 similar to that of the first reference form is interposed in the primary pressure introduction passage 9b so that the occurrence of water leakage is determined and detected by the water flow detection. It may be.

<6th reference form>
FIG. 10 shows a sixth reference embodiment in which the water flow device of Reference Invention 5 is applied to a hot water heater with a hot water filling function, and 6b is a primary pressure for introducing the feed water pressure as the primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and an orifice 63 as a path resistance means is interposed at a midway position. The primary pressure introduction path 6b constitutes a “feed water pressure introduction path”.

  The primary pressure introduction path 6 b is branched from a water inlet 21 at a position downstream of the water inlet flow sensor 26 of the hot water supply circuit 2. Therefore, when water leaks from the air opening 40 due to breakage of the pressure receiving portion 45 of the backflow prevention valve 4 and water flows in the primary pressure introduction path 6b, the water that has passed through the water flow rate sensor 26 enters the water inlet 21. Will flow into the primary pressure introduction path 6b.

  On the other hand, in the controller 7, when the hot water tap at the downstream end of the hot water supply passage 24 is opened by the user and the incoming water flow rate sensor 26 detects a flow rate higher than the minimum operating flow rate, hot water supply control is started and the combustion burner 23 is turned on. Combustion is started.

  Therefore, even if the pressure receiving portion 45 is damaged by the orifice 63 and water leakage occurs, the flow rate of water leaking to the atmosphere opening 40 through the primary pressure introduction path 6b is limited to a minute value less than the minimum operating flow rate. I have to.

  As a result, even if water leakage due to the above damage occurs, appropriate guidance or warning notification is given to the user while taking measures to limit the amount of water leakage below the minimum operating flow rate and minimize damage caused by water leakage. Will be able to do. That is, when the controller 7 receives the minute flow rate detection from the incoming water flow rate sensor 26, it is unknown whether the minute flow rate detection is caused by the looseness of the hot water tap or the occurrence of water leakage. First, a guidance notification is given to the effect that there is a risk of loosening due to forgetting to close the hot water tap. Still, if the minute flow rate detection continues for a predetermined time (for example, 1 hour), the remote controller 71 issues a warning notification that there is a possibility of water leakage due to the damage of the check valve 4 next time.

  On the other hand, when the controller 7 receives a minute flow rate detection from the incoming water flow rate sensor 26, if the operation switch for hot water supply use of the remote controller 71 remains in the OFF state, the remote control 71 immediately causes the check valve 4 to be damaged. Warning notification that there is a risk of water leakage.

In this preferred embodiment, while utilizing the incoming water flow rate sensor 26 inherent in entering waterways 21 for water leak detection, due to erroneous control generation of the hot water supply control to be disadvantageous in terms of utilizing the water inlet flow rate sensor 26 to the orifice 63 Even if water leakage occurs by the orifice 63, it is possible to minimize the water leakage damage while preventing it by restricting the flow rate. Therefore, in the case of this reference form, the orifice 63 is provided, and the above-described control content is simply added to the controller 7, and the fact that the pressure receiving portion 45 is in a state of being repaired due to the countermeasure for suppressing the cost increase is used. The person can be notified.

<Seventh Reference Form>
FIG. 11 shows a seventh reference embodiment in which the water flow device of Reference Invention 6 is applied to a hot water heater with a hot water filling function, and what is denoted by reference numeral 6 c is a primary pressure introduction path that constitutes a “water supply pressure introduction path”.

  The primary pressure introduction path 6 c is branched from a water inlet path 21 between a water inlet temperature sensor 28, which is a water inlet temperature detection means in the hot water supply circuit 2, and a downstream water inlet flow rate sensor 26, so that the pressure received by the backflow prevention valve 4 is received. The supply water pressure is introduced as the primary pressure on the part 45 side.

The incoming water temperature sensor 28 is integrally attached to an incoming water fitting 211 that is connected to a water pipe or the like at the upstream end of the incoming water passage 21. The incoming water temperature sensor 28 is composed of a self-heating thermistor, and can detect the occurrence of flowing water by self-heating as described in the first reference embodiment in addition to temperature detection. In FIG. 11, reference numeral 241 denotes a hot-water connection fitting that is connected to a pipe from the downstream end of the hot-water supply path 24 to the hot-water tap.

  When water leakage from the air opening 40 occurs due to the breakage of the pressure receiving portion 45, the water in the water inlet 21 that has passed through the water inlet temperature sensor 28 flows into the primary pressure introduction passage 6c. In response to the detection of running water from the controller, the controller 7 outputs a warning notification command to the remote controller 7 to notify the user that repair is necessary due to the occurrence of water leakage.

In this reference form, the occurrence of breakage of the pressure receiving portion 45 of the backflow prevention valve 4 is detected only by using a self-heating type thermistor as the incoming water temperature sensor that is originally provided in the hot water supply circuit 2, and a warning notification is given to the user. Can do.

<First Embodiment>
FIG. 12 shows a first embodiment in which the water passage device according to claim 1 or 2 is applied to a hot water heater with a hot water filling function, and the reference numeral 6d indicates a primary pressure introduction that constitutes a “water supply pressure introduction path”. Road.

  The primary pressure introduction path 6d is branched from a position upstream of the incoming flow rate sensor 26 of the incoming water path 21 of the hot water supply circuit 2, and an automatic closing means 64 is interposed at an intermediate position.

  The automatic closing means 64 includes a housing 644 having an inlet 641 and an outlet 642 in which a storage chamber 643 is defined, a piston-like valve body 645 as a closing member disposed in the storage chamber 643, A spring 646 for biasing the valve body 645, a magnet 647 built in or attached to the valve body 645, and a proximity switch 648 installed in the housing 644 at a position corresponding to the valve closing position of the valve body 645, It is configured with. The magnet 647 and the proximity switch 648 constitute movement detection means.

  The valve body 645 is formed in a shape that allows a slight gap from the inner peripheral surface of the storage chamber 643. When the pressure receiving part 45 of the backflow prevention valve 4 is damaged and starts to leak from the atmosphere opening port 40, the gap becomes larger when the water in the primary pressure introduction path 6d begins to flow toward the pressure receiving part 45. The valve body 645 is set against the spring 646 against the spring 646 to generate a differential pressure that can be closed by the flow resistance when passing. Therefore, the spring 646 is set to a weak spring load that can maintain the valve body 645 in the open state while the water in the primary pressure introduction path 6d is stationary.

  For this reason, when the pressure receiving part 45 is damaged and begins to leak from the air opening 40, the valve body 645 is moved to the outlet as shown in FIG. 13 by the flow of water in the primary pressure introduction path 6d due to the occurrence of the water leak. Immediately pressed by 642, the valve is closed, and the primary pressure introduction path 6d is automatically shut off. Thereby, the subsequent water leakage can be stopped at the same time or immediately after the water leakage from the atmosphere opening 40 starts.

  In addition, when the valve closing operation of the valve body 645 is detected by the proximity switch 648 that senses the magnetic flux line of the magnet 647, a warning notification command is output to the remote controller 71 by the controller 7 that has received this detection output. Therefore, it is possible to notify the user that the backflow prevention valve 4 needs to be repaired and that the water leak has been safely stopped.

Second Embodiment
FIG. 14 shows a second embodiment in which the water flow device according to claim 2 is applied to a water heater with a hot water filling function. This second embodiment employs an automatic closing means 64a in which elements relating to the movement detecting means are removed from the automatic closing means 64 in the first embodiment, and a new water leakage detecting means 47 is newly added to the atmosphere opening 40 instead. Is. 14 shows that the pressure receiving portion 45 is damaged and the primary pressure introduction path 6d is blocked by the automatic closing means 64a. As a result, the introduction of the primary pressure disappears and the valve element 42 is opened by the secondary pressure. It shows the state of being stuck.

The automatic closing means 64a is obtained by omitting the magnet 647 and the proximity switch 648 from the automatic closing means 64 (see FIG. 12) of the first embodiment. For this reason, when the pressure receiving portion 45 is damaged and water leakage from the atmosphere opening 40 starts to occur, the valve body 645 is automatically closed immediately and the primary pressure introduction path 6d is shut off. For this reason, the effect | action of the primary pressure introduced with respect to the pressure receiving part 45 will lose | disappear, and the valve body 42 will be opened by the secondary pressure from the pouring channel 31 side, There is a risk of water leaking from the air opening 40. Therefore, in this embodiment, the occurrence of water leakage is detected by the water leakage detection means 47 and output to the controller 7 so that a warning notification is given to the user.

  The water leakage detection means 47 is constituted by an electrode rod or a self-heating type thermistor. The principle of detecting the presence or absence of water (leakage) using a self-heating thermistor is as follows. When self-heating is performed periodically, if there is no water, the self-heating is only dissipated in the air, but if there is water, the heat will be deprived earlier even if the self-heating occurs. . For this reason, it is possible to detect the presence or absence of water leakage based on how the temperature decreases when the self-heat is generated.

  Further, as a method of disposing the water leakage detection means 47 with respect to the atmosphere opening 40, it is desirable to make it as shown in FIG. For example, in FIG. 15A, a concave groove 402 that opens upward is formed on the inner bottom surface located at the lowest position of the piping member 401 that constitutes the atmosphere opening 40, and the water leakage detection means 47 is placed upward in the concave groove 402. It is exposed and arranged. That is, the both side walls of the concave groove 402 are the bank portions. FIG. 15B shows a concave groove portion formed by forming a pair of bank portions 403 and 403 projecting upward in a smooth curve at both side positions excluding the lowest part on the inner bottom surface of the piping member 401. 404 is formed, and the water leakage detecting means 47 is exposed and disposed in the recessed groove portion 404. FIG. 15C shows a concave groove 406 formed by forming a pair of bank portions 405 and 405 projecting upward at both side positions excluding the lowest part on the inner bottom surface of the piping member 401. In this concave groove 406, the water leakage detecting means 47 is disposed so as to be exposed upward. That is, in each case, a groove portion sandwiched between a pair of bank portions is set as a water leakage passage at the lowest portion, and the water leakage detection means 47 is exposed at the bottom of this passage. Thereby, even if the amount of water leakage is small, the water leakage can be reliably detected.

< Third Embodiment>
FIG. 16 shows a third embodiment in which the water passage device according to claim 1 or 3 is applied to a water heater with a hot water filling function. This third embodiment is different from the second embodiment only in that an automatic closing means 65 different from that of the second embodiment is adopted, and other configurations are the same as those of the second embodiment.

  The automatic closing means 65 includes a diameter-enlarging chamber 651 that is expanded at least in the downward direction at an intermediate position in the primary pressure introduction path 6d, and a ball 652 that is a closing member that is accommodated in the diameter-enhancing chamber 651 so as to be freely movable. It is comprised with these. The ball 652 is formed larger in diameter than the inner diameter of the primary pressure introduction path 6d on the downstream side of the diameter expansion chamber 651.

  When the pressure receiving part 45 of the backflow prevention valve 4 is damaged and starts to leak from the atmosphere opening 40, the water in the primary pressure introduction path 6d starts to flow toward the pressure receiving part 45. The ball 652 is sucked by the change in flow velocity when passing through 651 and is sucked into the downstream opening as shown in FIG. 17, so that the primary pressure introduction path 6d is closed.

  Therefore, when the pressure receiving portion 45 is damaged and water leakage from the atmosphere opening 40 starts to occur, the ball 652 can immediately shut off the primary pressure introduction path 6d automatically. And since the effect | action of the primary pressure introduced with respect to the pressure receiving part 45 lose | disappears, the valve body 42 is opened by the secondary pressure from the pouring channel 31 side, and the water from the pouring channel 31 is open | released to air | atmosphere. When water leaks from 40, it is detected by the water leak detection means 47 and output to the controller 7. Receiving this output, the controller 7 can notify the user of a warning by the remote controller 71.

In addition, the arrangement | positioning method of the water leak detection means 47 of this embodiment is the same as what was demonstrated in 2nd Embodiment.

< Fourth embodiment>
FIG. 18 shows a fourth embodiment in which the water flow device according to claim 4 is applied to a water heater with a hot water filling function. In the fourth embodiment, movement detection means 48 for detecting the movement of the valve body 42 of the check valve 4 to the valve opening position is used in place of the water leakage detection means 47 of the third embodiment in order to detect the occurrence of water leakage. Except for this point, the other configuration is the same as that of the third embodiment. In FIG. 18, as the pressure receiving portion 45 is damaged and the primary pressure introduction path 6d is automatically closed by the automatic closing means 65, the introduction of the primary pressure disappears and the valve element 42 is opened by the secondary pressure. It shows the state that has been.

  The movement detecting means 48 includes a magnet 481 installed, for example, by being embedded in the valve body 42, and a proximity switch 482 installed in the housing 41 at a position corresponding to the valve opening position of the valve body 42. It is a thing.

  Therefore, when the valve element 42 is opened by the secondary pressure as described above, the opening movement is detected by the proximity switch 482, and a warning notification is given via the remote controller 71 by the controller 7 receiving the detection output. .

In the present embodiment, the automatic closing means 64a of the second embodiment may be used instead of the automatic closing means 65.

< Fifth Embodiment>
FIG. 19 shows a fifth embodiment in which the water flow device according to claim 5 or 6 is applied to a hot water heater with a hot water filling function, and 6e is a primary water pressure on the pressure receiving portion 45 side of the check valve 4. This is a primary pressure introduction path to be introduced, and a three-way switching valve 66 serving as an opening / closing switching valve that is controlled to be opened / closed by the controller 7 is interposed at an intermediate position. The primary pressure introduction path 6e constitutes a “feed water pressure introduction path”.

  The primary pressure introduction path 6e is branched from the inlet path 21 at the upstream side of the inlet flow rate sensor 26 of the hot water supply circuit 2, and water leaks from the air opening 40 due to breakage of the pressure receiving portion 45, so that the inlet path 21 is filled. Even if water flows into the primary pressure introduction path 6e from the engine, the occurrence of erroneous hot water control for the combustion burner 23 is prevented.

  In this embodiment, the three-way switching valve 66 is maintained in a state where the primary pressure introduction path 6e is communicated during normal operation. On the other hand, when water leakage occurs from the air opening 40 due to breakage of the pressure receiving portion 45, the water leakage occurrence is detected by the water leakage detection means 47, and the primary pressure introduction path 6e of the three-way switching valve 66 is received by the controller 7 receiving this detection output. Side switching and warning notification via the remote controller 71 are performed. As a result, the primary pressure introduction path 6e is blocked and the subsequent water leakage from the water entry path 21 can be stopped, and a warning notification can be given to the user.

< Sixth Embodiment>
FIG. 20 shows a sixth embodiment in which the water flow device of claim 8 is applied to a water heater with a hot water filling function, and 6f is a primary pressure for introducing a feed water pressure as a primary pressure into the pressure receiving portion 45 side of the backflow prevention valve 4. This is an introduction path, and an automatic closing means 67 is interposed at an intermediate position. The primary pressure introduction path 6f constitutes a “feed water pressure introduction path”.

  In the illustrated example, the primary pressure introduction path 6 f is branched from the inlet path 21 at the downstream side of the inlet flow sensor 26 of the hot water supply circuit 2, but is not limited to this, and the inlet path 21 at the upstream position of the inlet flow sensor 26. You may branch from.

  The automatic closing means 67 includes a piston valve 671 that is movably inserted while blocking the inside of the primary pressure introduction passage 6f in a watertight manner, and the piston valve 671 is stopped at a position on the check valve 4 side. A stopper portion 672 formed in the feed water pressure introduction path is provided. The piston valve 671 is composed of a valve body and a piston ring fitted on the outer periphery thereof. Then, the upstream side of the primary pressure introduction path 6f (the inlet path 21 side) and the downstream side (the backflow prevention valve 4 side) are filled with water with the piston valve 671 interposed therebetween. The water supply pressure acts on the pressure receiving part 45 via the piston valve 671.

  When the pressure receiving portion 45 is damaged and the water in the primary pressure introduction passage 6f on the downstream side of the piston valve 671 moves to the atmosphere opening port 40 side, the piston valve 671 also moves toward the downstream side along with the movement, and the stopper portion. It will stop at 672. Thereby, the movement of the water in the primary pressure introduction path 6f is stopped, and the water leakage from the atmosphere opening 40 is also stopped.

  The primary pressure introduction passage 6f on the downstream side of the piston valve 671 may be filled with other fluids regardless of gas or liquid as long as pressure can be transmitted without being limited to water.

< Seventh embodiment>
FIG. 21 shows a seventh embodiment in which the water flow device of claim 9 is applied to a water heater with a hot water filling function. The seventh embodiment is different from the sixth embodiment in that an automatic closing means 67a in which a movement detecting means is added to the automatic closing means 67 of the sixth embodiment, and other configurations are substantially the same as those of the sixth embodiment. The same.

The automatic closing means 67a includes a piston valve 671 and a stopper portion 672 similar to those of the sixth embodiment, a magnet 673 installed in the piston valve 671, and a primary pressure introduction path 6f at a position corresponding to the stopper portion 672. It comprises a proximity switch 674 installed on the construction wall. The magnet 673 and the proximity switch constitute movement detection means.

  In this embodiment, when the pressure receiving portion 45 of the check valve 4 is damaged and the piston valve 671 moves toward the downstream side and stops against the stopper portion 672, the movement of the piston valve 671 is detected by the proximity switch 674. This detection is output to the controller 7. The controller 7 receives the movement detection of the piston valve 671 and determines that the pressure receiving portion 45 is broken, and issues a warning notification by the remote controller 71. As a result, the movement of water in the primary pressure introduction path 6f and the water leakage from the atmosphere opening 40 are automatically stopped by the piston valve 671, and a warning is given to the user based on the detection by the proximity switch 674. Notification can be performed.

<Other embodiments>
The present invention is not limited to the above-described embodiments, but includes other various embodiments.

  For example, in each of the above-described embodiments, the backflow prevention valve 4 has a configuration in which the secondary pressure is applied to the valve portion 44 side while the primary pressure is applied to the pressure receiving portion 45. You may employ | adopt the backflow prevention valve 4a of the structure shown in FIG. As shown in detail in FIG. 23, the backflow prevention valve 4 a opens and closes the atmosphere opening port 40 by opening and closing the valve portion 44, and the secondary pressure from the pouring passage 31 is supplied from the secondary pressure connection port 411. It is made to act in the storage chamber 414. The primary pressure is applied to the pressure receiving part 45. In this case, in addition to the primary pressure, the secondary pressure can also act on the valve portion 44 of the valve body 42 on the valve closing side. When the primary pressure falls into the negative pressure state, the valve body 42 is pulled to the valve opening side as shown in FIG. 24, and the valve portion 44 is switched to the valve opening state. Thereby, the pouring channel 31 (see FIG. 20) is communicated with the atmosphere opening port 40 via the secondary pressure connection port 411 and the storage chamber 414. Note that the primary pressure introduction path 6g in FIG. 22 may be replaced with the primary pressure introduction path of each embodiment.

  In the backflow prevention valve 4 in each of the above-described embodiments, the movement direction (opening / closing direction) of the valve body 42 is illustrated in the vertical direction, but the present invention is not limited thereto, and the valve body 42 is moved in the horizontal direction. A backflow prevention valve 4 may be arranged.

  In each of the above embodiments, the pressure receiving unit 45 is configured by a diaphragm. However, the present invention is not limited to this, and the present invention can be applied to any material or structure that may be damaged.

  In each of the above embodiments, the case where the supply destination through the water passage is a bathtub has been described. However, the supply destination is not limited to the bathtub, and may be a washing tub, for example. In this case, the downstream end of the water passage may be connected to the bottom of the washing tub.

It is a schematic diagram which shows the water flow apparatus contrasted with this invention. FIG. 2 is a diagram corresponding to FIG. 1 when a pressure receiving portion is damaged. It is a schematic diagram which shows a 1st reference form. It is an expanded sectional view of a backflow prevention valve. FIG. 5 is a view corresponding to FIG. 4 in a valve open state. It is a schematic diagram which shows a 2nd reference form. It is a schematic diagram which shows a 3rd reference form. It is a schematic diagram which shows a 4th reference form. It is a schematic diagram which shows a 5th reference form. It is a schematic diagram which shows a 6th reference form. It is a schematic diagram which shows a 7th reference form. It is a schematic diagram which shows 1st Embodiment. FIG. 13 is a diagram corresponding to FIG. 12 when a pressure receiving portion is damaged. It is a schematic diagram which shows 2nd Embodiment. It is a figure which shows the arrangement | positioning method of a water leak detection means, FIG.15 (a) is an example which formed the ditch | groove, FIG.15 (b) is an example which formed the smooth bank part integrally, FIG.15 (c) is FIG. An example of integrally forming a bank is shown. It is a schematic diagram which shows the normal state of 3rd Embodiment. FIG. 17 is a view corresponding to FIG. 16 when the pressure receiving portion is damaged. It is a schematic diagram which shows 4th Embodiment. It is a schematic diagram which shows 5th Embodiment. It is a schematic diagram which shows 6th Embodiment. It is a schematic diagram which shows 7th Embodiment. The schematic diagram which shows the example using the backflow prevention valve of another form. It is an expanded sectional view of the backflow prevention valve of FIG. FIG. 24 is a view corresponding to FIG. 23, illustrating a state where the check valve of FIG. 22 is opened.

Explanation of symbols

4, 4a Backflow prevention valve 6, 6a-6g, 8, 9, 9a, 9b Primary pressure introduction path (feed water pressure introduction path)
7 Controller (control means)
8a Communication path 21 Inlet channel (inlet channel)
22 Heat exchanger 23 Combustion burner (heater)
24 Hot Spring (Department)
26 Incoming water flow sensor (Incoming water flow detection means)
27 Flow rate adjustment control valve 28 Incoming water temperature sensor (incoming water temperature detection means, self-heating type thermistor)
31 Pouring channel (branch path)
32 Pouring flow rate sensor (branch flow rate detection means)
33 Pouring solenoid valve (switching valve)
40 Air Opening Port 42 Valve Element 44 Valve Portion 45 Pressure Receiving Portion 47 Water Leakage Detection Unit 48 Movement Detection Unit 51 Filter 61 Flowing Water Detection Unit 62 First Orifice 63 Orifice (Passage Resistance Unit)
64, 64a, 65 Automatic closing means 66 Three-way switching valve (open / close switching valve)
71 Remote control (notification means)
81 Second orifice 82 Check valve 91 Temperature detection means 402 Concave groove 404, 406 Concave groove part 403, 405 Dike part 645 Valve body (closing member)
647, 673 Magnet (movement detection means)
648, 674 Proximity switch (movement detection means)
651 Diameter expansion chamber 652 Ball (closing member)
671 Piston valve 672 Stopper

Claims (20)

A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
Notification means;
Control means for controlling warning notification by the notification means;
A water flow detection means that is interposed in a water supply pressure introduction path for introducing a water supply pressure to the pressure receiving part and detects the occurrence of water flow in the water supply pressure introduction path,
The water flow apparatus is characterized in that the control means is configured to receive an output of water flow detection from the water flow detection means and to give a warning notification by the notification means. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
A notification means and a control means for controlling warning notification by the notification means;
The water passage is provided with a heat exchanger and a water inlet portion to the heat exchanger at the upstream side portion thereof, while a water outlet passage portion and a branch from the hot water passage portion are provided at the downstream side portion of the heat exchanger. A branch passage portion extending to the downstream end of the water flow passage, a branch flow rate detecting means for detecting a branch flow amount passing through the branch passage portion, and a branch passage located downstream of the branch flow rate detecting means. An open / close switching valve,
The water supply pressure introduction path is branched from an intermediate position between the branch flow rate detecting means and the open / close switching valve,
The water flow apparatus, wherein the control means is configured to notify a warning by the notification means when the branch flow rate detection means detects a flow rate even though the open / close switching valve is closed. . A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state due to a pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the air opening. A water flow device configured,
A notification means and a control means for controlling warning notification by the notification means;
The water passage is provided with a heat exchanger and a water inlet portion to the heat exchanger at the upstream side portion thereof, while a water outlet passage portion and a branch from the hot water passage portion are provided at the downstream side portion of the heat exchanger. A branch path extending to the downstream end of the water flow path, a branch flow rate detecting means for detecting a branch flow rate passing through the branch path, and an open / close switch interposed in the branch path downstream of the branch flow rate detecting means. With a valve,
The water supply pressure introduction path is branched from the water inlet section and the first orifice is interposed in the middle, while the downstream end of the communication path branched from an intermediate position between the branch flow rate detecting means and the open / close switching valve is A check valve that is connected to a feed water pressure introduction path at a position downstream of the first orifice and that prevents the flow toward the branch path at a midway position, and has a larger water flow cross-sectional area than the first orifice. A second orifice is interposed,
The water flow device, wherein the control means is configured to notify a warning by the notification means when the branch flow rate detection means detects a flow rate even though the open / close switching valve is closed. . A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
Further comprising a notification means and a control means for controlling warning notification by the notification means,
The water passage is provided with a heat exchanger and a water inlet portion to the heat exchanger at the upstream side portion thereof, while a water outlet passage portion and a branch from the hot water passage portion are provided at the downstream side portion of the heat exchanger. And a branch passage extending to the downstream end of the water passage,
The water supply pressure introduction path is branched from a hot water supply path portion at a downstream position of the heat exchanger, and includes a temperature detection means for detecting the temperature in the water supply pressure introduction path,
The water flow device characterized in that the control means is configured to issue a warning by the notification means when it is determined that a predetermined temperature fluctuation has occurred based on a temperature detection output from the temperature detection means. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
A notification means and a control means for controlling warning notification by the notification means;
The water passage is provided with a heat exchanger, a water inlet portion to the heat exchanger, and an incoming water flow rate detecting means interposed in the water inlet portion in the upstream portion thereof,
The water supply pressure introduction path is branched from a water inlet section at a downstream position of the water inlet flow rate detecting means,
The control means notifies when the incoming flow rate detection means detects a flow rate or when the flow rate detection state continues for a predetermined time despite the fact that the operation switch of the heater for heating the heat exchanger is in an OFF state. It is comprised so that a warning alert | reports by means, The water flow apparatus characterized by the above-mentioned. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
A notification means and a control means for controlling warning notification by the notification means;
The water passage is provided with a heat exchanger, a water inlet portion to the heat exchanger, and a water inlet temperature detecting means interposed in the water inlet portion in an upstream portion thereof,
The feed water pressure introduction path is branched from a water inlet section at a position downstream of the water inlet temperature detecting means,
The incoming water temperature detecting means is composed of a self-heating thermistor, and is configured to detect the occurrence of flowing water by temperature change during self-heating in addition to temperature detection,
The control means is configured to issue a warning by the notification means when the incoming water temperature detection means detects the occurrence of flowing water even though the operation switch of the heater for heating the heat exchanger is in an OFF state. The water flow device characterized by being made. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
An automatic closing means interposed in a water supply pressure introduction path for introducing a water supply pressure to the pressure receiving unit;
The automatic closing means includes a closing member that keeps the water supply introduction path in a communicating state while the filled water in the supply water pressure introduction path is stationary, and moves to close the water supply introduction path by the generation of flowing water. A water flow device characterized by comprising. The water flow device according to claim 7,
Notification means;
A movement detecting means for detecting movement of the closing member toward the closing side;
A water flow device further comprising control means for receiving an output of movement detection from the movement detection means and causing the notification means to issue a warning. The water flow device according to claim 7,
Notification means;
Water leakage detection means for detecting the occurrence of water leakage from the atmosphere opening;
A water flow device further comprising a control unit that receives an output of water leakage detection from the water leakage detection unit and causes the notification unit to issue a warning. The water flow device according to claim 7,
Notification means;
A movement detecting means for detecting the movement of the valve body of the check valve to the valve opening side;
A water flow device further comprising control means for receiving an output of movement detection from the movement detection means and causing the notification means to issue a warning. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
An on-off switching valve that is interposed in a feed water pressure introduction path that introduces feed water pressure to the pressure receiving portion and is maintained in a normally open state;
Water leakage detection means for detecting the occurrence of water leakage from the atmosphere opening;
And a control means for receiving the output of water leak detection from the water leak detection means and switching the open / close switching valve to a closed state. The water flow device according to claim 11,
A water flow device further comprising notification means, wherein the control means is configured to cause the notification means to issue a warning when the open / close switching valve is switched to a closed state. The water flow device according to claim 9 or 11,
A pair of bank portions extending in the direction of water leakage and projecting upward are formed on the top surface of the bottom wall in the passage constituting the atmosphere opening,
The water leakage detecting device, wherein the water leakage detection means is exposed and disposed at a lowest part sandwiched between the pair of bank portions. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
An automatic closing means interposed in a water supply pressure introduction path for introducing a water supply pressure to the pressure receiving unit;
The automatic closing means includes a piston valve that is movably inserted while shutting off the water supply pressure introduction passage in a watertight manner, and the water supply pressure introduction passage so as to stop the piston valve at the backflow prevention valve side position. A water passage device comprising a formed stopper portion. The water flow device according to claim 14, wherein
Notification means;
A movement detecting means for detecting movement of the piston valve toward the stopper,
A water flow device further comprising control means for receiving an output of movement detection from the movement detection means and causing the notification means to issue a warning. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
A heat exchanger interposed in the upstream portion of the water passage, a flow rate adjustment control valve with a closing function downstream thereof, a control means for controlling the flow rate adjustment control valve, and a supply pressure introduction passage. Temperature detecting means for detecting the temperature in the feed water pressure introduction path,
A feed water pressure introduction path for introducing feed water pressure to the pressure receiving portion is branched from a downstream position of the flow rate adjustment control valve,
The water flow device characterized in that the control means is configured to close the flow rate adjustment control valve when it is determined that a predetermined temperature rise fluctuation has occurred based on a temperature detection output from the temperature detection means. . The water flow device according to claim 16, wherein
Further comprising a notification means,
The control means is configured to cause a warning to be notified by the notification means when the flow rate adjustment control valve is closed based on a temperature detection output from the temperature detection means. A water flow device according to any one of claims 1, 3, 6, 7 to 15,
The water passage is configured to include a heat exchanger on the upstream side thereof, a water inlet portion to the heat exchanger, and a water inlet flow rate detecting means interposed in the water inlet portion,
The water supply device, wherein the water supply pressure introduction path is branched from a water inlet section upstream of the water inlet flow rate detecting means. The water flow device according to any one of claims 1 to 18,
A water flow device in which a filter is interposed at a water flow path side position from the valve portion of the backflow prevention valve or at a position upstream from the midway position of the water flow path. A backflow prevention valve is interposed at a midway position between the downstream end of the water passage where the feedwater pressure from the water supply source acts on the upstream end. The valve portion on the front end side receives the pressure in the water passage at the middle position, the pressure receiving portion on the rear end side of the valve body receives the feed water pressure from the water passage on the upstream side of the middle position, The valve portion is connected so as to be maintained in a closed state by the pressure difference received from the side, and when the pressure difference is reversed between positive and negative, the valve is opened so that the water passage at the midway position communicates with the atmosphere opening. A water flow device configured,
It is provided with a passage resistance means that is interposed in a feed water pressure introduction passage that introduces a feed water pressure to the pressure receiving portion and restricts the passage of water in the feed water pressure introduction passage to a predetermined minimum flow rate or less.
A water flow device characterized by that.

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