JP3835277B2 - Bath kettle with water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention supplies hot water from a hot water supply circuit of a water heater to a hot water tap of a kitchen or the like, while hot water from the hot water supply circuit is directly applied to the bathtub or via a recirculation circuit for filling the bathtub. The present invention relates to a water bath with a water heater configured to pour water indirectly.
[0002]
[Prior art]
Conventionally, in this kind of hot water bath with a water heater, when negative pressure is generated in the hot water supply circuit that receives tap water supply due to, for example, water outage or power failure, the hot water in the bathtub in the recirculation circuit In order to prevent the occurrence of a situation where the water flows backward and flows into the hot water supply circuit, it is necessary to connect the hot water supply circuit and the recirculation circuit to a state where the hot water can be poured while the hot water can be poured. An example of means for realizing this will be described based on an example of a bath with a water heater shown in FIG.
[0003]
That is, a hot water supply circuit 500 is branched from the downstream of a flow rate adjustment valve (water amount servo valve) 201 provided on the hot water supply side of the hot water supply circuit 200, and the hot water supply circuit 200 and the recirculation circuit 4 through the hot water supply circuit 500. Are connected in communication. The pouring circuit 500 is provided with an edge-cutting valve device 510 comprising a vacuum breaker (negative pressure breaking valve) 501, a pouring electromagnetic valve 502 and two-stage check valves 54 and 55. To do both. The above vacuum breaker 501 sucks outside air (air) when a predetermined negative pressure is generated in the circuit and cancels the negative pressure state. A pouring solenoid valve 502 switches the pouring circuit 500 to open and close to pour hot water. Further, the two-stage check valves 54 and 55 are configured to block the flow in the reverse direction while allowing the flow in the pouring direction (forward direction). The vacuum breaker 501 presses the valve element against the valve seat with a spring and keeps the valve element closed at all times. When a negative pressure is applied to the circuit, the valve element opens against the spring and opens air in the circuit. The negative pressure is eliminated (destroyed). In FIG. 6, reference numeral 30 denotes a hot water supply temperature sensor, which is interposed at an intermediate position between the flow rate adjusting valve 201 and the branch portion.
[0004]
Here, when the above negative pressure is generated, each set is gathered from the water supply cut-off, elevated water tank, etc. that is the water supply source on the hot water supply circuit side (hot water primary side) where the water supply pressure (original pressure) is originally acting When pumps are pumped to the upper floors of a house (a condominium, etc.), a pump stop due to a power failure, etc. may cause the pressure on the primary side of the hot water supply to drop and create negative pressure. In addition, the request for preventing the backflow is to prevent the hot water in the bathtub from flowing back from the recirculation circuit side to the hot water supply circuit side that may be used for drinking.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional hot water bath 10 with a hot water heater, the negative pressure destruction performance is improved in order to ensure the prevention of the backflow of the bath hot water to the hot water supply circuit 200 when the negative pressure is generated on the primary side of the hot water supply. When the air suction performance by the vacuum breaker 501 is improved, even if negative pressure does not occur on the primary side of the hot water supply, air suction is likely to occur due to circumstances on the secondary side (bath side), and the air is sucked and mixed into the circuit. Inconveniences are likely to occur due to air, particularly on the bath side (side of the recirculation circuit 4). In other words, if priority is given to the prevention of backflow to the hot water supply circuit due to negative pressure destruction, it will easily cause inconveniences on the bath side, and conversely if the negative pressure destruction performance is to be reduced (relaxed) in order to prevent such inconveniences. There is a problem in that backflow prevention due to the above-described negative pressure breakdown is neglected.
[0006]
For example, if the spring load setting of the vacuum breaker 501 is reduced (weakening the spring) to improve the negative pressure destruction performance and the air suction performance is increased, air suction is performed with good responsiveness due to the generation of negative pressure on the hot water supply primary side. Although the prevention of the backflow from the bath side is ensured, minute leakage from the air suction port of the vacuum breaker 501 and air mixing in the recirculation circuit 4 are likely to occur.
[0007]
That is, when the hot water supply primary side is in a normal positive pressure state and is at a relatively low pressure, the valve body of the vacuum breaker 501 slightly moves in the opening and closing direction due to pressure fluctuations, and minute leakage occurs from the air suction port. . Further, when the pouring flow rate is reduced by the flow rate adjusting valve 201 on the downstream side of the hot water supply circuit 200, the pressure on the secondary side is lowered, and negative pressure tends to be generated, so that air is sucked from the vacuum breaker 501. Furthermore, in particular, when the bath tub 10 with a water heater is installed on the floor and the bathtub 3 is installed on the lower floor, there is no negative pressure on the primary side of the hot water supply when pouring or dropping into the lower tub. Due to the dropping of hot water, the secondary side tends to have a negative pressure, and air suction from the vacuum breaker 501 occurs due to this influence. If this suction air remains in the recirculation circuit 4, it causes malfunction of various sensors installed on the recirculation circuit 4 side for reheating operation control, which may cause false detection and control.
[0008]
For example, when the pressure-type water level detection sensor 47 erroneously detects the water level in the bathtub, filling with hot water is performed exceeding a predetermined set water level, or when the water flow switch 48 erroneously detects, a predetermined circulation flow is generated. Nevertheless, it is not detected and erroneously determined as poor circulation, and if the return temperature sensor 49 erroneously detects, excessive boiling of the hot water in the bathtub or insufficient reheating may be caused.
[0009]
On the contrary, if the spring load setting of the vacuum breaker 501 is increased (the spring is strengthened) in order to suppress the suction of air in the case of pouring / dropping into the downstairs bathtub, the vacuum is generated when negative pressure is generated on the primary side of the hot water supply. The valve body of the breaker 501 does not open with good responsiveness, and the negative pressure state cannot be effectively destroyed.
[0010]
The present invention has been made in view of such circumstances, and the object of the present invention is to improve the air suction performance by the negative pressure destruction valve in order to ensure the negative pressure destruction while accompanying it. It is an object of the present invention to provide a water bath with a water heater that can surely prevent the occurrence of various inconveniences.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a hot water supply circuit that receives hot water by a heating source and supplies hot water to the hot water tap side, and branches off from the hot water supply circuit at a position downstream of the heating source. Placed in the pouring circuit On / off valve for pouring hot water Open above Hot water supply from the above hot water supply circuit for hot water baths with a water heater connected to the bathtub from the hot water supply circuit Flow in the hot water supply circuit Through the volume control valve Above salary Faucet side And the above pouring circuit On / off valve side for hot water Branch to A negative pressure release valve that opens by receiving a predetermined negative pressure and sucks outside air into the circuit, A hot water supply circuit upstream of the pouring on / off valve, Position downstream of the heating source of the hot water supply circuit The water supply pressure in the hot water supply circuit before the flow rate adjustment by the flow rate adjustment valve Position upstream from the above flow control valve Above salary The hot water circuit is interposed (claim 1).
[0012]
In the case of the present invention, a negative pressure breaking valve is interposed in the hot water supply circuit upstream of the flow rate adjustment valve position where hot water from the hot water supply circuit branches to the hot water tap side and the pouring on / off valve side. Therefore, unlike the conventional configuration in which the negative pressure release valve is interposed on the pouring circuit downstream from the above branch position, it is interposed on the hot water supply circuit side and before the flow rate adjustment by the flow rate adjustment valve. Therefore, at the normal time, that is, at the normal time, the water supply pressure in the hot water supply circuit (the water supply pressure before the flow rate adjustment) always acts on the negative pressure breaking valve as the internal pressure. For this reason, even if the holding force (for example, spring force) for maintaining the negative pressure breaker valve in the closed state is weakened, the negative pressure breaker valve is reliably maintained in the closed state by the action of the water supply pressure, but the primary side of the hot water supply falls into negative pressure. If the negative pressure release valve opens with good responsiveness and sucks in outside air (air), the negative pressure state can be immediately eliminated. As a result, while avoiding the occurrence of minute leaks from the negative pressure release valve reliably, not only when the pouring on / off valve is in the open state, but also when the abnormal operation of the closing has occurred. Also, it becomes possible to reliably prevent the backflow from the bathtub side. The pouring from the hot water supply circuit may be either hot water or water.
[0013]
On the other hand, even when there is a relatively large drop between the downstairs tub and the hot water bath with a hot water heater on the downstairs tub, there is a negative pressure release valve in the conventional pouring circuit. Compared to the case where it is interposed, the resistance to pouring and dropping increases, so that it becomes difficult to become negative pressure, and even if it occurs, the negative pressure state can be reduced. In addition, since the negative pressure release valve is installed upstream of the flow rate adjustment valve, even if the pouring flow rate is throttled by the flow rate adjustment valve, the pouring circuit downstream of the conventional flow rate adjustment valve The pressure acting like the negative pressure break-off valve at the conventional position inserted in is not reduced, so that air suction does not occur, and there is no inconvenience in the circuit on the bathtub side caused by air suction during flow rate adjustment. It does not cause it.
[0014]
In the first aspect of the present invention, the following configuration may be further added. That is, the pouring on / off valve has a structure in which the valve is allowed to open when the pouring on / off valve receives a predetermined pressure opposite to the pouring direction when the valve is closed, and the negative pressure breaking valve has a negative pressure. The valve opening characteristic for opening the valve upon receiving and the valve opening characteristic for opening the valve upon receiving the reverse pressure of the pouring on / off valve when the negative pressure breaking valve intakes the negative pressure from the hot water supply circuit. The start timing is related to the start timing of the pouring on / off valve (Claim 2). As an example of this relationship, the valve opening operating pressure of the pouring on / off valve that starts to open upon receiving a reverse pressure is received, and the negative pressure release valve receives negative pressure and starts to suck in outside air. What is necessary is just to set so that it may become larger in an absolute value than the setting intake operating pressure which becomes different. For example, when the water supply pressure on the hot water supply circuit side is applied to the valve body of the above-described pouring on / off valve as a pressure for maintaining the closed valve, the valve opening is permitted if negative pressure is received from the hot water supply circuit side Even if it receives negative pressure as described above, the negative pressure release valve opens first and sucks in air, that is, by making it difficult to open the pouring on / off valve, It is possible to reliably prevent the occurrence of inconveniences such as the occurrence of backflow and the rise of the bathtub water level due to the valve opening first.
[0015]
In addition, as a heating source of the hot water supply circuit in the present invention, for example, any one that performs heat exchange heating with a heat exchanger that receives combustion heat, one that heats with an electric heater, or the like may be employed. In addition, as a negative pressure release valve, there is a valve that urges a valve body such as a plunger, a ball or a diaphragm to a valve closing side by a spring such as a coil spring or a flat spring. As long as the valve opens, the type and structure are not limited.
[0016]
【The invention's effect】
As described above, according to the first aspect of the present invention, the negative pressure release valve is interposed in the hot water supply circuit located upstream of the flow rate adjustment valve. The feed water pressure before the flow rate adjustment in the hot water supply circuit can always be applied to the negative pressure breaking valve as the internal pressure. For this reason, even if the holding force of a spring or the like that maintains the negative pressure release valve in the closed state is weakened, it can be reliably maintained in the closed state by the action of the water supply pressure, and the occurrence of minute leakage or the like can be reliably avoided. On the other hand, if the primary side of the hot water supply falls into a negative pressure, the negative pressure release valve is opened with good responsiveness and the outside air is sucked in to immediately eliminate the negative pressure state and reliably prevent backflow from the bathtub side. Can do. In addition, it is possible to reduce the negative pressure generated in the case of pouring and dropping into the lower tub, compared to the conventional case, and the pressure drop during the flow adjustment regardless of the flow adjustment by the flow adjustment valve The negative pressure release valve is not affected by this, and it is possible to avoid the occurrence of inconveniences such as the erroneous detection of various sensors on the recirculation circuit side caused by air suction. Therefore, while improving the negative pressure destruction performance by the negative pressure destruction valve, it is possible to avoid the occurrence of inconvenience associated with the inclusion of the negative pressure destruction valve.
[0017]
In particular, according to the second aspect, when the pouring open / close valve is configured to open by receiving a predetermined pressure opposite to the pouring direction, the negative pressure breaks even when the negative pressure is applied. The valve opens before the pouring open / close valve and sucks air to destroy the negative pressure, and the pouring open / close valve opens before the negative pressure break valve. It is possible to reliably prevent the occurrence of inconveniences such as the occurrence of back flow and the rise of the bath water level.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
<First Embodiment>
FIG. 1 shows a hot water heater-equipped bathtub 1 according to the first embodiment of the present invention.
[0020]
The bath 1 with a water heater includes a hot water supply circuit 2 that realizes a hot water supply function, a forced circulation type reheating circuit 4 that realizes a hot water replenishment function in the bathtub 3, and the hot water supply circuit 2 and a recirculation circulation. A pouring circuit 5 that connects the circuit 4 and realizes a filling function is provided.
[0021]
The hot water supply circuit 2 heats water introduced from a water supply path 21 connected to a water pipe by heat exchange heating with the combustion heat of a combustion burner 23 in a hot water supply side heat exchanger 22, and discharges the heated hot water from a hot water supply path. 24 and the hot-water supply path 25 are used to supply hot water to the hot-water taps 26a and 26b at the downstream end. Here, the heat exchanger 22 and the combustion burner 23 arranged in the combustion can not shown constitute a heating source. A bypass passage 27 is provided between the water supply passage 21 and the hot water supply passage 24, and temperature adjustment to the set temperature is performed by water mixing adjustment control by the adjustment valve 27a. The hot-water tap 26a is a currant disposed in a kitchen or the like, and the hot-water tap 26b is a shower currant installed in a bathroom or a washstand.
[0022]
The water supply passage 21 is provided with an incoming water temperature sensor 28 and an incoming water flow rate sensor 29. The hot water supply passage 24 has a hot water supply temperature sensor 30 as a hot water supply temperature detecting means for detecting the temperature of hot water supplied to the hot water supply taps 26a, 26b or the pouring circuit 5, and a negative pressure breaker valve (vacuum breaker) 31. And the flow rate adjusting valve 32 are arranged in order from the upstream side. That is, the negative pressure release valve 31 is positioned downstream of the heat exchanger 22 as a heating source (if the bypass 27 is attached for temperature control by mixed water adjustment, downstream of the bypass 27. It is interposed downstream from the junction with the end) and upstream from the flow rate adjustment unit 32. In other words, the negative pressure release valve 31 is a hot water supply circuit 2 on the upstream side of a later-described pouring solenoid valve (pouring on / off valve) 52, and is connected to the heat exchanger 22 (or the junction of the bypass passage 27). It is interposed in the hot water supply circuit 2 at a position between the flow rate adjustment valve 32. A 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 is performed by a controller (not shown). In this controller, mainly the incoming water temperature sensor 28 and the incoming water flow rate sensor. The hot water supply control is performed based on the detected values from the hot water supply temperature sensor 29 and the hot water temperature sensor 30.
[0023]
Here, the negative pressure release valve 31 and the flow rate adjustment valve 32 will be described in detail with reference to FIG. 2. The negative pressure release valve 31 includes an air suction port 311 opened to the atmosphere, and the air suction port. 311 and a branch communication passage 312 that connects the hot water discharge passage 24 at a position upstream of the flow rate adjustment valve 32, and a valve body 314 that is interposed in the communication passage 312 and is movable in the opening / closing direction with respect to the valve seat 313. And a spring 315 that presses the valve body 314 against the valve seat 313 and maintains the valve closed state. The valve body 314 is integrally provided with a rubber layer seated on the valve seat 313 and a guide portion for guiding the movement only in the opening and closing direction, and the spring 315 is a compression coil spring. It is comprised and is spanned between the receiving member 316 and the said valve body 314. As shown in FIG. The spring load of the spring 315 is set to be relatively weak so that the valve element 314 opens when the pressure in the hot water outlet 24 falls to a negative pressure.
[0024]
The flow rate adjusting valve 32 includes an inlet 321 that communicates with the outlet 24, a plunger 322 that moves forward and backward toward the inlet 321, and a motor (for example, a stepping motor) 323 that moves the plunger 322 forward and backward. It is equipped with. Then, by adjusting the plunger 322 forward and backward, the gap amount (opening) between the valve portion 324 on the tip side and the inlet 321 is adjusted to increase or decrease, and the hot water supply path 25 or the hot water supply path 25 is adjusted. The passing flow rate to 51 can be changed and adjusted. Here, the plunger 322 is screwed into a holding cylinder 327 whose screw portion 325 is fixed to the housing 326, while a proximal serration portion 328 is coupled to the motor 323, and the plunger 322 is driven by the motor 323. Advancing and retreating is performed by rotating around the axis.
[0025]
The recirculation circuit 4 includes a circulation path 43 including a return path 41 and an outward path 42 respectively connected to the bathtub 3, and is returned to the bath-side heat exchanger 45 from the return path 41 by the operation of the circulation pump 44. The hot water in the bathtub 3 is heat-exchanged and heated by the combustion heat of the combustion burner 46, and the heated hot water is supplied again through the forward path 42 into the bathtub 3 to be repelled.
[0026]
In the return path 41, in order from the upstream side in the circulating direction of the circulating hot water, a water level sensor 47 for detecting the water level of the bathtub 3 by water pressure detection, the circulation pump 44, and a flap is opened by the passage of the circulating flow to determine circulation. A water flow switch 48 that outputs an ON command and a return temperature sensor 49 that detects the temperature of the circulating hot water returned from the bathtub 3 to the bath-side heat exchanger 45 are provided. Based on the detection value from the water level sensor 47, the hot water pouring control up to a predetermined water level is performed by the controller, and based on the detection value from the return temperature sensor 49, the hot water temperature in the bathtub 3 at the time of reheating is grasped. Thus, the reheating control up to a predetermined temperature is performed by the controller, and the controller determines whether or not the circulation operation is normal in the reheating control by the output signal from the water flow switch 48.
[0027]
The pouring circuit 5 has an upstream end that branches from the downstream side of the flow rate adjustment valve 32, and a downstream end that is located downstream of the circulation pump 44 in the return path 41 in FIG. And a hot water supply passage 51 communicating with the hot water supply circuit 2 through the hot water supply passage 51 and flowing into the circulation circuit 4 to be poured into the bathtub 3. . In the pouring path 51 of the pouring circuit 5, a pouring electromagnetic valve 52 that is controlled to be opened or closed by the controller in order from the upstream side, and a pouring flow rate for detecting the pouring flow rate. A sensor 53 and two-stage check valves 54 and 55 each having a structure that allows only flow to the bathtub 3 side are provided. Based on the detection value from the pouring flow rate sensor 53, the amount of hot water filling the bathtub 3 is grasped by the controller.
[0028]
In the pouring control by the controller, for example, when a hot water filling switch of the remote controller is turned ON, the pouring electromagnetic valve 52 is opened and combustion of the combustion burner 23 is started. Thereafter, the temperature is set to a predetermined temperature set in the remote controller or the like. Thus, the combustion operation of the combustion burner 23 and the opening adjustment of the flow rate adjustment valve 32 are performed. As a result, the hot water having the predetermined temperature is dropped from the hot water supply circuit 2 into the bathtub 3 through the pouring circuit 5 and the recirculation circuit 4, and the water level detected by the water level sensor 47 reaches the predetermined water level or the pouring flow rate sensor. When the accumulated hot water amount by 53 reaches a predetermined hot water amount, the hot water solenoid valve 52 is closed and the combustion operation of the combustion burner 23 is stopped.
[0029]
In the case of the bath tub 1 with a water heater having the above-described configuration, the negative pressure release valve 31 has a water supply pressure in the outlet 24 of the hot water supply circuit 2 with respect to the valve body 314, that is, a supply before the flow rate adjustment by the flow rate adjustment valve 32. The water pressure always acts as an internal pressure in the valve closing direction. For this reason, even if the spring load setting of the spring 315 that biases the valve body 314 to the closed state is made relatively weak to improve the air suction performance, the above-described water supply pressure is received in addition to the spring 315 to reliably It can be kept closed. Thereby, unlike the conventional case where the hot water in a state in which the flow rate is throttled by the flow rate adjusting valve 32 passes through the downstream side of the flow rate adjusting valve 32 and disposed in the pouring circuit 5, The possibility of the occurrence of minute leakage from the negative pressure release valve 31 can be reliably avoided.
[0030]
On the other hand, even if the hot water supply primary side falls into a predetermined negative pressure state due to water cut or power failure, the air suction performance is improved, so the valve body 314 is opened with good responsiveness, and the air from the air suction port 311 In this way, the negative pressure state can be immediately eliminated, and not only during pouring (the pouring solenoid valve 52 is open), but also when the pouring is stopped but the pouring solenoid valve Even if a closing operation abnormality such as a foreign matter biting has occurred in 52 or the check valves 54 and 55, backflow from the recirculation circuit 4 side can be reliably prevented.
[0031]
Also, even when the hot water bath 1 is installed on the floor and the bathtub 3 is installed on the lower floor, a negative pressure release valve is installed in the hot water circuit even when pouring or dropping into the lower bathtub 3. Compared to the conventional case (see FIG. 6), the resistance to pouring and dropping increases, so that it becomes difficult to be in a negative pressure state, and the negative pressure state is reduced. In addition, even if the pouring flow rate is throttled by the flow rate adjusting valve 32, unlike the conventional case (see FIG. 6) interposed downstream from the flow rate adjusting valve 32, it acts on the negative pressure breaking valve 31. Therefore, the pressure (feed water pressure) is not lowered, and therefore air suction is not generated. As a result, it is possible to avoid the possibility of misdetection and misjudgment of various sensors 47 and 49 and the switch 48 on the recirculation circuit 4 side due to air suction during flow rate adjustment, and realize appropriate control. be able to. The recirculation circuit 4 described above also when the hot water temperature sensor 30 is disposed at a downstream position of the flow rate adjustment valve 32, that is, at an intermediate position between the flow rate adjustment valve 32 and the branching portion, as in the case of FIG. As in the case of the various sensors on the side, the possibility of erroneous detection due to mixed air can be reliably avoided, and the hot-water supply temperature to the hot-water taps 26a, 26b or the pouring temperature to the bathtub 3 can be reliably set to a predetermined value. It can be controlled to the set temperature.
[0032]
Second Embodiment
FIG. 3 shows a hot water solenoid valve 52a used in a hot water pouring circuit 5a of a bath tub 1a with a hot water heater (see FIG. 1) according to a second embodiment of the present invention. Here, the conventional pouring electromagnetic valve 502 (see FIG. 6) is constituted by a pilot-type diaphragm valve. The pouring electromagnetic valve 502 has a low pressure to a high pressure with respect to the pouring direction (positive direction) in the closed state. Therefore, the closing performance (sealing performance to keep the closed state) is mainly required, so the closing performance in the reverse direction is not so much required, and the valve opens in response to the reverse pressure even at low pressure. Yes. On the other hand, the pouring solenoid valve 52a defines a pressure setting that opens in response to the pressure in the reverse direction in relation to the intake start timing at which air suction of the negative pressure destruction valve 31 is started. is there. That is, in the pouring electromagnetic valve 52a in this embodiment, the pouring electromagnetic valve 52a receives a pressure in the reverse direction at the timing when the negative pressure destruction valve 31 starts to open by adding a closing biasing spring 529 described later. It is configured so that it always comes before the opening timing.
[0033]
In addition, since the other component of the bath tub 1a with a water heater of this 2nd Embodiment is the structure similar to the thing of 1st Embodiment, the same code | symbol is attached | subjected to the same component and the detailed description is abbreviate | omitted. To do.
[0034]
The pouring electromagnetic valve 52a is configured by an inner cylindrical portion 522 having a valve seat 521 formed around the tip thereof and communicating with the downstream side (tub 3 side) and a donut annular space on the outer peripheral side of the inner cylindrical portion 522. A flow port 523 communicating with the upstream side (the hot water supply circuit 2 side), a diaphragm valve 524 disposed so as to cover the valve seat 521 and the flow port 523, and opened / closed to and from the valve seat 521 by elastic deformation; A diaphragm chamber 525 that is defined on the opposite side of the valve seat 521 with the diaphragm valve 524 interposed therebetween, and a plunger 528 that is advanced and retracted in the opening and closing direction by the plunger guide 526 and is operated by the electromagnet 527.
[0035]
The diaphragm valve 524 is composed of a disk plate 524a and a rubber diaphragm 524b whose outer peripheral edge is pressed and fixed, a bleed hole 524c that makes the flow port 523 and the diaphragm chamber 525 communicate with each other at the same pressure, and the inner cylinder. A center hole 524d communicating with the portion 522. When the plunger 528 is not energized, the plunger spring 528a returns to the valve closing position to close the center hole 524d in a closed state (normally closed; see FIG. 3), while when energized, the electromagnet 527 causes the plunger spring 528a to close. Therefore, the center hole 524d is communicated with the diaphragm chamber 525 to convert the diaphragm valve 524 into an open state. In this valve open state, the flow port 523 and the inner cylinder portion 522 communicate with each other to allow pouring, and in the valve closed state, the center hole 524d is closed by the rubber seal portion at the tip of the plunger 528.
[0036]
In the pouring electromagnetic valve 52a having such a structure, a closing biasing spring 529 for elastically biasing the diaphragm valve 524 toward the closing side is further provided. The closing biasing spring 529 is constituted by a compression coil spring spanned between, for example, a plunger guide 526 that partitions one side of the diaphragm chamber 525 and the disk plate 524a, and directly biases the diaphragm valve 524. It is arranged.
[0037]
In such a pouring electromagnetic valve 52a, when the diaphragm valve 524 is closed, the water supply pressure from the hot water supply primary side (the hot water supply circuit 2 side) is circulated through the flow port 523 and the diaphragm chamber 525 bleed in through the bleed hole 524c. On the other hand, from the secondary side (the bathtub 3 side), atmospheric pressure from the water surface of the bathtub 3 acts on the inner cross-sectional area portion of the inner cylinder portion 522. Normally, the valve is kept closed mainly based on the differential pressure between the primary side and the secondary side. That is, if the feed water pressure becomes high, the internal pressure in the diaphragm chamber 525 also becomes high, and the differential pressure becomes higher and the diaphragm valve 524 is pressed more strongly against the valve seat 521 so that the sealing performance from low pressure to high pressure is reached. Has come to demonstrate. For this reason, the plunger spring 528a is originally set to a spring load that is as weak as possible so that the center hole 524d to which atmospheric pressure acts can be closed while not causing excessive operation resistance of the electromagnet 527.
[0038]
Therefore, if the closing biasing spring 529 does not exist, when the back pressure in the reverse direction is applied, the valve opens even at a relatively low pressure, causing the following inconvenience. That is, when a negative pressure from the hot water supply circuit 2 side, for example, is received as the back pressure, the diaphragm chamber 525 also becomes a negative pressure, and the diaphragm element 524 is easily opened because the resistance element is mainly the plunger spring 528a. When the negative pressure is received, the negative pressure release valve 31 is also opened. However, if the opening operation timings of both the negative pressure release valve 31 and the pouring electromagnetic valve 52a are unspecified, the pouring electromagnetic valve 52a is When the valve is opened first even for a moment, the negative pressure destruction valve 31 is subsequently opened, so that hot water in the circuit flows into the bathtub 3 and causes the water level of the bathtub 3 to rise, or the negative pressure destruction valve If the negative pressure is smaller than the valve opening operating pressure 31 (the valve opening start pressure), the negative pressure acts on the water surface of the bathtub 3.
[0039]
Therefore, in the present embodiment, priority is given to the negative pressure destruction performance, while the open pressure (intake start pressure: absolute value) at which the negative pressure destruction valve 31 receives the negative pressure and starts to open is relatively small (for example, the water level) 35mmH which is 1/2 of the rising standard ₂ O), and the pouring solenoid valve 52a is given a characteristic that the opening operating pressure (absolute value) at which the opening operation starts upon receiving a negative pressure is larger than that of the negative pressure breaking valve 31.
｜ Opening pressure of negative pressure release valve | <| Opening pressure due to back pressure of pouring solenoid valve |
[0040]
Specifically, the spring load value of the spring 315 (see FIG. 2) of the negative pressure breaking valve 31 and the spring load value of the closing biasing spring 529 of the pouring electromagnetic valve 52a (more precisely, the spring load of the plunger spring 528a). The spring load value to be added to the value) is set so as to have the above characteristics. That is, in terms of characteristics, the spring load for maintaining the negative pressure destruction valve 31 in the closed state is made weaker than the spring load for maintaining the pouring electromagnetic valve 52a in the closed state, and the negative pressure destruction occurs when negative pressure is applied. The valve 31 is opened before the pouring solenoid valve 52a.
[0041]
As a result, even if the primary side of the hot water supply is in a negative pressure state, the negative pressure release valve 31 is always opened prior to the pouring solenoid valve 52a and sucks air, and the negative pressure state is eliminated by this air suction. As a result of the pressure state being eliminated, the pouring electromagnetic valve 52a is maintained in the closed state by the closing biasing spring 529 and the like. As a result, it is possible to avoid the above-described inconvenience.
[0042]
<Other embodiments>
The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, in the said 1st and 2nd embodiment, although the example of 2 cans and 2 circuits was shown as the bathtub 1 and 1a with a water heater, even if it applies this invention to the bath with a water heater of 1 can and 2 circuits The same effect as described above can be obtained.
[0043]
In the second embodiment, the addition of the closing biasing spring 529 causes the spring load of the pouring electromagnetic valve 52a to have a predetermined characteristic in relation to the opening timing of the negative pressure release valve 31, but the closing In place of the addition of the urging spring 529, the resistance force against the elastic deformation of the rubber diaphragm 524b (elastic resistance function for maintaining the diaphragm valve 524 in the closed state) is increased as shown in FIG. 4, or the bleed hole is shown in FIG. A check ball 530 may be disposed as a check member at a position on the diaphragm chamber 525 side of 524c. By adding such an alternative configuration, the same operational effects as those of the second embodiment can be obtained. Of course, either one or both of FIGS. 4 and 5 may be further added to the addition of the closing biasing spring 529.
[0044]
4 changes the pressing and fixing position of the outer peripheral edge 524b 'of the rubber diaphragm 524b to a position below the position of the valve seat 521, for example, and increases the elastic tension for maintaining the closed state of the rubber diaphragm 524b. Thus, the same action as the spring load of the closing biasing spring 529 is achieved.
[0045]
Further, in the configuration of FIG. 5 described above, the check ball closes the bleed hole 524c when a negative pressure is applied from the hot water supply primary side, whereas the check ball 530 is caused by the supply water pressure when a normal pressure is applied. It is pushed up to bring the bleed hole 524c into a communicating state. In FIG. 5, 530a is a pin for preventing the check ball 530 from falling off. In this case, when the negative pressure is applied, the flow port 523 and the diaphragm chamber 525 are blocked by the check ball 530, thereby maintaining the diaphragm chamber 525 at the internal pressure up to that time and preventing the diaphragm valve 524 from being opened. it can. Therefore, the negative pressure release valve 31 can be reliably opened first during the negative pressure operation.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing first and second embodiments of the present invention.
FIG. 2 is a detailed enlarged cross-sectional explanatory view of a portion A in FIG.
FIG. 3 is a cross-sectional explanatory view of a pouring electromagnetic valve according to a second embodiment.
FIG. 4 is a diagram corresponding to FIG. 3 of another embodiment that obtains the same operation and effect as the second embodiment.
FIG. 5 is a partially enlarged cross-sectional view of another embodiment different from FIG. 4 that obtains the same operational effects as the second embodiment.
FIG. 6 is a view corresponding to FIG. 1 showing an example of a conventional bath with a hot water heater.
[Explanation of symbols]
1,1a Bathtub with water heater
2 Hot water supply circuit
3 Bathtub
4 Recirculation circuit
22 Heat exchanger (heating source)
23 Combustion burner (heating source)
26a Karan (hot water tap)
26b Shower currant (hot water tap)
30 Hot water temperature sensor (hot water temperature detection means)
31 Negative pressure release valve
32 Flow control valve
52,52a Pouring solenoid valve (Pouring on / off valve)

Claims (2)

A hot water supply circuit that includes hot water supply circuit that receives hot water by a heating source and supplies hot water to the hot water tap side, and opens a pouring on / off valve that is disposed in the pouring circuit branched from the hot water supply circuit located downstream of the heating source. In a hot water bath with a water heater connected to the bathtub from the above hot water supply circuit,
Configured as hot water from the hot water supply circuit is branched subjected feeding the pouring-off valve side of the supply hot water faucet side及beauty the pouring circuit via a flow amount adjusting valve disposed in the hot water supply circuit While
In response to predetermined negative pressure vacuum break valve to suck in the opening to the circuit outside air, a hot water supply circuit upstream of the pouring-off valve, downstream of the heat source of the upper Symbol hot water supply circuit water heater with a bath, characterized in that the water supply pressure is interposed the paper water circuit upstream position than the flow rate adjusting valve so as to act in the hot water supply circuit before flow rate adjustment by the flow control valve at a position Kettle. A bath tub with a water heater according to claim 1,
The pouring on / off valve has a structure that allows the valve to be opened when a predetermined pressure in the direction opposite to the pouring direction is received in the closed state.
The valve opening characteristic in which the negative pressure release valve is opened by receiving negative pressure and the valve opening characteristic in which the pouring on / off valve is opened by receiving a reverse pressure receive negative pressure from the hot water supply circuit. A bath tub with a water heater in which the suction start timing of the negative pressure release valve is related to the opening start timing of the pouring on / off valve.

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