JP4168288B2 - Negative pressure breaker - Google Patents

Description

  In the present invention, purified water supplied directly from a water supply or indirectly from a water receiving tank by pumping can be directly or indirectly injected into a storage tank open to the atmosphere through a branch path, and negative pressure is generated on the side of the purified water supply path. The present invention relates to a negative pressure breaking device for destroying (releasing) the negative pressure at the time of preventing the backflow from the storage tank side to the purified water supply path side.

  Conventionally, as this kind of negative pressure breaking device, for example, a device installed in a hot water supply device is known. This hot water supply device supplies hot water to a hot water tap of a kitchen or the like by a hot water supply circuit that receives purified water, and a water pouring path (branch path) branched from the hot water supply circuit to a storage tank that is open to the atmosphere, such as a bathtub or a washing tub Or it is configured so that hot water or water can be poured directly or indirectly through a water injection channel (branch channel) branched from the purified water supply channel, and a negative pressure breaker for the above water injection channel or water injection channel. Is installed. Such a negative pressure destruction device is, for example, when a negative pressure is generated in a hot water supply circuit (or in a water supply circuit) to which tap water (purified water) is supplied due to, for example, a water cut or a power failure on the side of the tap water supply, The negative pressure is provided to prevent the occurrence of a situation in which hot water from a storage tank such as a bathtub or a washing tub flows backward and flows into the hot water supply circuit (or the water injection circuit), that is, into the purified water supply channel. While the hot water supply circuit or the like and the storage tank can be poured by the destruction device, they are connected to each other so that they can be cut off. In other words, a negative pressure destruction device is installed to prevent the occurrence of a situation where hot water in a bathtub or washing tub, which is miscellaneous water, flows backward into a hot water supply circuit or the like that is filled with purified water. . An example of a conventional negative pressure breaking device for realizing the backflow prevention performance will be described based on an example installed in the hot water supply device 10 shown in FIG.

  This hot water supply apparatus 10 is an example of a hot water heater-equipped bath pot that can pour hot water into the bathtub 3 as a storage tank. That is, a hot water supply circuit 500 is branched from the downstream of a flow rate adjustment valve (water amount servo valve) 31 provided on the hot water supply side of the hot water supply circuit 2, and the hot water supply circuit 2 and the recirculation circuit 4 through the hot water supply circuit 500. Can be connected to the bathtub 3 from the hot water supply circuit 2. Then, with respect to the pouring circuit 500, a vacuum breaker (negative pressure breaking valve) 501 from the upstream side, a pouring electromagnetic valve 502 which is an on / off valve for pouring water, and two-stage check valves 54 and 55 are arranged in this order. An apparatus is interposed to perform both pouring and edge cutting. 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 to keep it normally closed. When a negative pressure is applied to the circuit, the valve element opens against the spring and sucks air into the circuit. The above negative pressure is eliminated (destroyed). Further, the pouring electromagnetic valve 502 is constituted by a pilot type diaphragm valve as illustrated in FIG. That is, a diaphragm chamber 525 is defined on the upper side of the drawing with the diaphragm valve 524 as a valve element interposed therebetween, while a hot water supply circuit is provided on the outer peripheral side of the diaphragm valve 524 with the inner cylinder portion 522 being sandwiched therebetween. 2 is formed, and the inner peripheral side range communicates with the bathtub 3 side. And, when the diaphragm valve 524 is pressed against the valve seat 521 at the tip of the inner cylinder 522, the hot water supply circuit 2 side and the bathtub 3 side are shut off, that is, the valve is closed. In the closed state, the feed water pressure is bleed into the diaphragm chamber 525 from the hot water supply circuit 2 side through the bleed hole 524c, and this feed water pressure acts on the diaphragm valve 524 as a valve closing maintaining pressure. In other words, the higher the feed water pressure, the higher the pressure is pushed toward the valve closing side, and the closed sealing performance is exhibited. On the other hand, during pouring, the electromagnet 527 is energized to move the plunger 528 upward in FIG. 6 against the plunger spring 528a, thereby opening the center hole 524d and allowing the diaphragm chamber 525 to communicate with the bathtub 3 side. The diaphragm valve 524 is opened.

  Here, in the case where the above-described negative pressure occurs, the water supply source 2 side (hot water supply primary side; purified water supply side) on which the supply water pressure (positive pressure) is originally acting, When pumps are pumped from an aquarium or the like to the upper floor of each housing complex (condominium, etc.), a pump stop or the like due to a power failure may occur, resulting in a decrease in the pressure on the primary side of the hot water supply and negative pressure.

  However, in the conventional negative pressure breaking device, the pouring electromagnetic valve 502 has a structure in which the valve opening is permitted when a predetermined pressure in the direction opposite to the pouring direction is received in the closed state. When the negative pressure is generated on the primary side of the hot water supply, the timing of the intake operation due to the opening of the vacuum breaker 501 and the timing at which the pouring electromagnetic valve 502 is opened are unspecified, that is, individually opened. If the valves are opened based on the operating characteristics, there is a risk of causing a reverse inflow from the bathtub 3 side even though the vacuum breaker 501 is interposed.

  That is, as described above, the diaphragm valve 524 of the pouring electromagnetic valve 502 is maintained in a closed state mainly by the internal pressure (feed water pressure) in the diaphragm chamber 525. Therefore, the plunger spring 528a originally has The spring load is set to be as weak as possible so that the center hole 524d on which the atmospheric pressure from the water surface of the bathtub 3 acts can be closed while keeping the excessive operating resistance of the plunger 528. For this reason, when negative pressure is applied from the hot water supply circuit 2 side, the diaphragm chamber 525 also becomes negative pressure, and the diaphragm valve 524 is easily opened because the only resistance element to the valve opening side is the plunger spring 528a. When the negative pressure is received, the vacuum breaker 501 is also opened. However, if the opening operation timings of both the vacuum breaker 501 and the pouring electromagnetic valve 502 are unspecified, the pouring electromagnetic valve 502 is moved forward even for a moment. When the valve is opened, reverse inflow from the bathtub 3 side occurs.

  The inconvenience of reverse inflow as described above also occurs when the pouring connection target is not a bathtub but is connected to the washing tub from a hot water supply circuit (or a water supply circuit) so that automatic pouring is possible.

  The present invention has been made in view of such circumstances, and an object thereof is to enable water injection from a purified water supply path side to a storage tank open to the atmosphere by a negative pressure destruction valve and a water injection opening / closing valve. Another object of the present invention is to provide a negative pressure breaking device capable of ensuring sufficient prevention of reverse inflow from the storage tank side in a negative pressure breaking device which attempts to ensure edge cutting.

  In order to achieve the above object, in the present invention, the water supply primary side has a negative pressure while adopting a configuration that secures a high sealing performance with respect to the water supply pressure from low pressure to high pressure while giving priority to the operation efficiency in the on-off valve for water injection. When falling into a state, the negative pressure release valve always starts the intake operation before the opening timing of the on-off valve for water injection.

Specifically, in the present invention, a storage tank that is open to the atmosphere is connected to a purified water supply path supplied with purified water under a predetermined supply water pressure through a branch path branched from the purified water supply path so that water can be injected, and the branch path In contrast, a negative pressure release valve is provided upstream and a water injection on-off valve is provided downstream, and the negative pressure release valve is opened by receiving a predetermined negative pressure and sucks outside air into the interior. On the other hand, the on-off valve for water injection is intended for a negative pressure breaking device having a structure in which the valve opening is permitted when a predetermined pressure opposite to the water injection direction is received in the closed state . The following specific matters were prepared.

Chi words, shall comprise blocking means for blocking the negative pressure when subjected to negative pressure from the water purification supply channel side in its closed state as the water injection on-off valve acts on valve-opening side with respect to the valve body , a valve opening characteristic of the valve opening operation on SL vacuum break valve is subjected to negative pressure, and a valve opening characteristic of the water injection on-off valve is opened operated by receiving a reverse pressure, negative from said purified water supply channel When the pressure is applied, the intake pressure start timing of the negative pressure release valve is related to the valve opening start timing of the water injection on / off valve (Claim 1).

The above-mentioned specific items are specifically expressed in different expressions as follows. Chi words, as the water injection on-off valve, which comprises a blocking means in which the negative pressure when subjected to negative pressure from the water purification supply channel side in its closed state to block that acts on the valve-opening side with respect to the valve body As the valve opening operating pressure that starts to open under the reverse pressure, the absolute value is larger than the set intake operating pressure that the negative pressure release valve receives negative pressure and starts to suck in outside air. (Claim 2).

  In the present invention, the `` storage tank open to the atmosphere '' is a storage tank in which the stored water that has been injected into the bottom forms a free water surface, and atmospheric pressure acts on the free water surface, For example, in the case of a hot water supply device, a bathtub that receives pouring for bathing (water filling) for bathing from a hot water supply circuit as a purified water supply path, or a hot water filling (water filling) for washing hot water from the hot water supply circuit. Examples of the storage tank include a washing tub that receives pouring hot water.

According to the present invention, even when a negative pressure is applied from the purified water supply path side (primary water supply side) when the water injection on / off valve is in the closed state, the water injection on / off valve is blocked by the blocking means. Pressure does not act, and this makes it possible to keep the water injection on-off valve closed. As a result, even if the water supply primary side falls into a negative pressure state, the negative pressure release valve must open before the water injection on / off valve to suck in air, and this negative pressure state is eliminated by this air suction. The Then, by eliminating this negative pressure state, it is possible to keep the irrigation on / off valve in the closed state as a result, and as a result, the negative pressure destruction valve can be reliably turned on while eliminating the possibility of the irrigation on / off valve opening. It is possible to release the negative pressure state by the intake operation and reliably prevent the occurrence of reverse inflow.

As the “shut-off means” in the present invention, the following specific configuration may be employed when the water injection on-off valve is configured by a pilot diaphragm valve. That is, in the case of adopting a configuration in which the supply pressure from the purified water supply path is guided to the diaphragm chamber through the bleed hole and acts as the valve closing maintaining pressure on the diaphragm valve that is a valve body, What is necessary is just to comprise by the non-return element which receives the negative pressure from the said purified water supply path side, and interrupts | blocks the said bleed hole while receiving the feed water pressure which is a positive pressure from the said purified water supply path side. ). As such a check element, there is a check valve or the like, but the simplest example is a check ball shown in the following embodiment.

Further, as the on-off valve for water injection, even if the negative pressure destruction valve receives a negative pressure at least equivalent to the intake operating pressure from which the outside air starts to be sucked in from the purified water supply path side, the valve is not opened and is kept closed. It is sufficient to provide a valve closing holding means. By providing such a valve closing holding means and actively maintaining the valve closing state until a specific negative pressure state is obtained, the negative pressure action is achieved. Sometimes, the negative pressure release valve is always opened before the irrigation on / off valve so that the intake operation can be started. In this case, the "valve closing holding means" can take various specific configurations. For example, when the on-off valve for water injection is constituted by a diaphragm valve, the diaphragm valve is actively moved to the closing side. Is elastically biased. That is, when the on-off valve for water injection is constituted by a pilot-type diaphragm valve, and the water supply pressure from the purified water supply path is led to the diaphragm chamber so as to act as the valve closing maintaining pressure on the diaphragm valve which is a valve body the, as the closed valve maintaining means, that make up a閉付bias spring for elastically urging the diaphragm valve to the closed side. By pressing more strongly to such閉付closing side diaphragm valve with a biasing spring, it is possible to ing to produce the always ahead intake operation of the negative pressure release valve (claim 4 ).

  As such a closing urging spring, the plunger spring described in the prior art section may have a stronger spring characteristic that satisfies the valve opening operation characteristic described above, but more actively, the diaphragm valve is used as a valve. A valve disposed so as to be directly elastically urged so as to be pressed against the seat (Claim 5) can be additionally employed. Alternatively, the diaphragm valve can be closed while being elastically displaced in the opening and closing direction. It can also be constituted by the elastic resistance function of the diaphragm valve itself that maintains the state (Claim 6).

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The negative pressure breaking device according to any one of claims 1 to 6 is suitably applied to the following. That is, the purified water supply path is a hot water supply circuit that receives purified water and is heated by a heating source to supply hot water to the hot water tap side or a water supply circuit that receives purified water and supplies water to the water tap side. A storage tank that is open to the atmosphere is connected to the circuit through a branch passage so that pouring or pouring can be performed (claim 7 ). In addition, in this case, in addition to the hot water poured when the heating source of the hot water supply circuit is operated to be heated from the hot water supply circuit to the storage tank, there is water injection when water is poured while the heating source is not heated.

As described above, according to the negative pressure breaking device of the present invention of claim 1 or claim 2, even if the water supply primary side falls into a negative pressure state when the water injection on-off valve is closed , The negative pressure does not act on the water injection on / off valve after being shut off by the shut-off means, and the negative pressure release valve must open before the water injection on / off valve to suck in air. While the pressure state can be eliminated, the injection valve can be maintained in the closed state as it is by eliminating the negative pressure state. This result, while eliminating the risk of water injection on-off valve is opened by opening the vacuum breaker valve to ensure previously, to eliminate the negative pressure state by the suction operation, water injection on-off valve is a negative pressure The occurrence of reverse inflow caused by opening the valve before the release valve can be reliably avoided.

According to the third aspect, as the shut-off means, it is possible to provide means that can be suitably applied when the water injection on-off valve is constituted by a pilot-type diaphragm valve.

According to the fourth aspect of the present invention , the negative pressure release valve is not closed but is maintained in the closed state even when receiving from the hot water supply circuit a negative pressure that is at least equivalent to the intake operating pressure at which the air starts to be sucked in. By providing the holding means in the water injection on / off valve, the water injection on / off valve can be actively kept closed until a specific negative pressure state is reached, and the negative pressure release valve is reliably opened first. The negative pressure state can be eliminated by the intake operation, and the occurrence of reverse inflow can be reliably prevented. Then, it is possible as a closed holding means of the upper SL, provides閉付bias spring which can be suitably applied to a case of constituting the water injection on-off valve by a diaphragm valve. In this case, according to the fifth or sixth aspect, a specific configuration that can be adopted as the closing biasing spring can be specified and provided.

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Furthermore, according to Claim 7 , the structure of the concrete object which can apply the negative-pressure destruction device of this invention suitably can be specified, and it can supply from a storage tank side, such as a bathtub and a washing tub, to a hot water supply circuit or a water supply circuit. The occurrence of reverse inflow can be reliably prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

< Prerequisite Components and First Additional Components of Embodiments to be described later >
Figure 1 shows an overall outline of the water heater with bathtub as hot water supply apparatus 1 according to the vacuum break device obtained by adding the first additional component to the premise components of the real施形condition of the present invention. That is, the present implementation embodiment is an application of the present invention when the pouring-water injection can the bath 3 as the storage tank through Chuyuro (branch path) 50 which branches from the water supply circuit 2 as purified water supply path .

  The hot water supply device 1 includes a hot water supply circuit 2 that realizes a hot water supply function, a forced circulation reheating circuit 4 that realizes a reheating function of hot water in the bathtub 3, the hot water supply circuit 2, and a recirculation circuit 4. And a pouring circuit 5 that realizes a hot water filling function for the bathtub 3.

  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.

  The water supply passage 21 is provided with an incoming water flow rate sensor 28 and an incoming water temperature sensor 29. In addition, a hot water supply temperature sensor 30 for detecting the temperature of hot water supplied to the hot water taps 26a, 26b or the pouring circuit 5 and a flow rate adjusting valve 31 are arranged in this order from the upstream side. . 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 flow rate sensor 28, the incoming water temperature sensor 29, and the like. The hot water supply control is performed based on each detected value from the hot water temperature sensor 30.

  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.

  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.

  The pouring circuit 5 has an upstream end branched from the downstream side of the flow rate adjusting valve 31 and a downstream end positioned at any position of the circulation path 43 (in FIG. 1, a position downstream of the circulation pump 44 of the return path 41). The hot water supply path 50 is provided as a branching path that communicates with the hot water from the hot water supply circuit 2 through the hot water supply path 50 and flows into the circulation circuit 4 to be poured into the bathtub 3. It has become. In the pouring path 50 of the pouring circuit 5, a vacuum breaker (vacuum breaker) that opens and receives a predetermined negative pressure in order from the upstream side and eliminates (breaks) the negative pressure by sucking air from the outside. ) 51, a pouring electromagnetic valve 52 as a pouring on / off valve that is controlled by the controller to switch between pouring (pouring) and shutting off, a pouring flow rate sensor 53 that detects the pouring flow rate, and Two-stage check valves 54 and 55 having a structure allowing only the 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.

Prior to the detailed description of the negative pressure release valve 51 and the pouring electromagnetic valve 52, the pouring control by the controller will be described below. For example, when the remote control of water filling switch is O N, pouring solenoid valve 52 is opened to start burning the combustion burner 23, and thereafter, the combustion burner 23 to a predetermined temperature set in the remote controller or the like The combustion operation and the opening adjustment of the flow rate adjustment valve 31 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.

  As shown in detail in FIG. 2, the negative pressure release valve 51 includes an air suction port 511 that is open to the atmosphere, a branch communication path 512 that connects the air suction port 511 and the pouring channel 50, and this communication A valve body 514 interposed in the passage 512 and movable in the opening / closing direction with respect to the valve seat 513, and an initial spring load is applied so that the valve body 514 is pressed against the valve seat 513 and maintained in the closed state. And a spring 515. The valve body 514 is integrally provided with a rubber layer seated on the valve seat 513 and a guide portion for guiding the movement only in the opening / closing direction, and the spring 515 is a compression coil spring. It is comprised and is spanned between the receiving member 516 and the said valve body 514. FIG. The spring load of the spring 515 is set to be relatively weak (described later) so that the valve element 514 opens when the pressure in the pouring channel 50 falls to a negative pressure.

Further, the pouring solenoid valve 52, as shown in detail in FIG. 3, by the addition of閉付biasing spring 529 described later as a closed holding means, i.e. by the addition of the first additional component, a negative pressure The timing at which the negative pressure release valve 51 starts to open at the time of action is always configured to be earlier than the timing at which the pouring solenoid valve 52 opens. That is, the pouring solenoid valve 52 includes an inner cylinder portion 522 that has a valve seat 521 formed around the tip and communicates with the downstream side (tub 3 side), and a donut annular space on the outer peripheral side of the inner cylinder portion 522. A flow port 523 configured to communicate with the upstream side (the hot water supply circuit 2 side), and a diaphragm valve 524 that is disposed so as to cover the valve seat 521 and the flow port 523 and that opens and closes to the valve seat 521 by elastic deformation. And a diaphragm chamber 525 that is formed 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 advanced and retracted by the electromagnet 527.

  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 center hole 524d communicating with the portion 522. When the plunger 528 is not energized, the plunger spring 528a returns to the closed position to close the center hole 524d in the closed state (normally closed; see FIG. 3). 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.

  In such a pouring electromagnetic valve 52, 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.

Then, the pouring solenoid valve 52 having such a structure, and閉付biasing spring 529 further biases elastically the diaphragm valve 524 in the valve closing side is arranged as a first additional component. The closing biasing spring 529 is constituted by, for example, a compression coil spring that spans between a plunger guide 526 that partitions one side of the diaphragm chamber 525 and the disk plate 524a, and the diaphragm valve 524 is directly connected to the valve seat 521 side. It is arrange | positioned so that it may press on.

In this embodiment, in order to prioritize the negative pressure destruction performance, the open pressure (intake start pressure: absolute value) at which the negative pressure destruction valve 51 starts to open under negative pressure is relatively reduced (for example, the water level). 35 mmH ₂ O which is 1/2 of the rising reference), and the opening operating pressure (absolute value) at which the pouring solenoid valve 52 starts to open upon receiving a negative pressure is larger than that of the negative pressure release valve 51 Is granted.
｜ Opening pressure of negative pressure release valve | <| Opening pressure due to back pressure of pouring solenoid valve |

  Specifically, the spring load value of the spring 515 (see FIG. 2) of the negative pressure release valve 51 and the spring load value of the closing biasing spring 529 of the pouring electromagnetic valve 52 (more precisely, the relatively high value of the plunger spring 528a). The spring load value obtained by adding a small spring load value) is set to have the above characteristics. That is, in terms of characteristics, the spring load that maintains the negative pressure release valve 51 in the closed state is made weaker than the spring load that maintains the pouring electromagnetic valve 52 in the closed state, and the negative pressure breaks down when negative pressure is applied. The valve 51 is opened before the pouring solenoid valve 52 is opened.

Even if the first additional component is added to the prerequisite component of the above embodiment, even if the primary side of the hot water supply (primary side of the water supply) is in a negative pressure state, the negative pressure release valve 51 is not supplied with electromagnetic water. The valve 52 is always opened before the air is sucked in, and the negative pressure state is eliminated by this air suction. As a result of the negative pressure state being eliminated, the pouring electromagnetic valve 52 is closed by the closing biasing spring 529 and the like. Will be maintained. Therefore, in the negative pressure breaking device in the hot water supply device 10 having the conventional structure, the hot water electromagnetic valve 502 (see FIG. 6) opens before the negative pressure breaking valve 501 when negative pressure is generated on the hot water supply circuit 2 side. The reverse inflow from the bathtub 3 side which accompanies can be avoided.

< Second additional component >
FIG. 4 shows a hot water solenoid valve (water injection) employed in a hot water supply apparatus 1a (see FIG. 1) to which a negative pressure breaking device in which a second additional constituent part is added to a prerequisite constituent part of an embodiment described later of the present invention. Open / close valve 52a. This pouring solenoid valve 52a enhances the elastic resistance function of the rubber diaphragm 524b constituting the diaphragm valve 524 toward the side away from the valve seat 521 to a specific characteristic, thereby opening the negative pressure breaking valve 51 during negative pressure action. It is configured such that the timing at which the valve starts is always ahead of the timing at which the pouring electromagnetic valve 52a is opened. That is, the above-mentioned elastic resistance function of the diaphragm valve 524 itself constitutes a closing bias spring and thereby constitutes a valve closing holding means. The other components of the second additional component are the same as those in the column of “Prerequisite components and first additional components of the later-described embodiment”, and therefore the same components are denoted by the same reference numerals. The detailed description is omitted.

  The means for enhancing the elastic resistance function of the diaphragm valve 524 can be realized by changing the material or thickness of the rubber diaphragm 524b itself. In the second embodiment, the outer peripheral edge of the rubber diaphragm 524b is used. This is realized by changing the fastening and fixing position of 524b ′ from that of the conventional structure (see FIG. 6).

That is, the fixing position of the outer peripheral edge 524b ′ of the rubber diaphragm 524b is changed to a position at least in the lower position in FIG. 4 from the valve seat 521 position, for example. Accordingly, it is possible to increase the elastic tension of the rubber diaphragm 524b that resists an external pressure to keep the diaphragm valve 524 closed and open the valve. The degree of increase in the elastic tension may be set so that the spring load setting of the closing biasing spring 529 described in the first embodiment is exhibited, and thus the closing biasing spring as in the first additional component part. The same action and effect as in the case of the first additional component can be obtained without newly adding 529.

< Third additional components >
A hot water solenoid valve (water on / off valve) 52b employed in a hot water supply apparatus 1b (see FIG. 1) to which a negative pressure breaking device in which a third additional component is added to a premise component of an embodiment described later is As shown in FIG. 6, by using the plunger spring 528b that is set to a spring load that is increased to a specific characteristic rather than the spring load setting of the conventional plunger spring 528a, the negative pressure release valve 51 is opened during negative pressure action. It is configured such that the timing at which the valve starts is always ahead of the timing at which the pouring electromagnetic valve 52b is opened. In other words, the plunger spring 528b having a larger spring load constitutes a closing biasing spring, thereby constituting the valve closing holding means. The contents of the other components of the third additional component are the same as those described in the column “Prerequisite component and first additional component of the later-described embodiment”. The same reference numerals are given and detailed description thereof is omitted.

  The plunger spring 528b is obtained by setting, as a spring load, a value obtained by adding the set spring load of the closing biasing spring 529 in the first embodiment to the relatively weak set spring load of the conventional plunger spring 528a.

In the case of this third additional component , the plunger spring 528b has a spring load that is increased by a predetermined amount compared to the conventional one, so that the resistance when the plunger 528 is retracted during energization during pouring increases and the operating load increases. although it is necessary to, so that it is possible to obtain the same effects as in the first additional component without adding a new閉付biasing spring 529 as the first additional component.

< Embodiment >
FIG. 5 shows a water pouring electromagnetic valve (water pouring open / close valve) 52c employed in a hot water supply apparatus 1c (see FIG. 1) to which a negative pressure breaker equipped with a precondition part and a characteristic part of the embodiment of the present invention is applied. Is shown. The hot water solenoid valve 52c is added to the hot water supply circuit 2 side by adding a check ball 530 for blocking the negative pressure from being propagated to the diaphragm chamber 525 when a negative pressure is applied from the hot water supply circuit 2 side. The diaphragm valve 524 is configured not to open even if a negative pressure is generated. The check ball 530 constitutes a check element for blocking the bleed hole 524c and includes this to constitute a blocking means. Since other components of the implementation form of this is the same configuration as that of the column of "premise components and the first additional component of the embodiment described later," above, the same reference numerals are used for the same elements A detailed description thereof will be omitted.

  In the present embodiment, the bleed hole 524c is expanded in diameter on the diaphragm chamber 525 side, and the check ball 530 is inserted into the bleed hole 524c in the expanded diameter portion from the diaphragm chamber 525 side. Then, after the charging, the pin 530a is penetrated as a drop-off preventing member near the opening on the diaphragm chamber 525 side of the check ball 530 so that the check ball 530 does not jump out to the diaphragm chamber 525 side. Yes.

  In the case of such a pouring solenoid valve 52c, in normal times (when no negative pressure is generated on the hot water supply circuit 2 side), a positive water pressure is received from the hot water supply circuit 2 side through the bleed hole 524c and checked. The ball 530 is pushed up in the enlarged diameter hole toward the pin 530a, whereby the flow port 523 and the diaphragm chamber 525 are in communication with each other. Thereby, the said water supply pressure is propagated in the diaphragm chamber 525, and the diaphragm valve 524 can be maintained in a closed state based on this water supply pressure. On the other hand, when negative pressure is received from the hot water supply circuit 2 side, the check ball 530 is attracted to the small diameter hole side of the bleed hole 524c to block the bleed hole 524c (see the state shown in FIG. 5). As a result, the negative pressure is not propagated to the diaphragm chamber 525, and the diaphragm chamber 525 can be kept at the internal pressure up to that time. Both the internal pressure and the negative pressure acting on the flow port 523 are closed on the diaphragm valve 524 side. Therefore, the diaphragm valve 524 can be kept closed.

  Therefore, even if a negative pressure is generated on the hot water supply circuit 2 side, the negative pressure can be eliminated by the intake operation of the negative pressure breaking valve 51 while the hot water electromagnetic portion 52c is reliably maintained in the closed state. Thereby, in the hot water supply apparatus 10 of the conventional structure, the bathtub 3 is generated when the hot water solenoid valve 502 (see FIG. 6) opens before the negative pressure destruction valve 501 when negative pressure is generated on the hot water supply circuit 2 side. Reverse inflow from the side can be avoided.

<Other embodiments>
In addition, this invention is not limited to what is described as a premise component of the said embodiment, the 1st-3rd additional component, embodiment (feature component), and includes other various embodiment. It is. That is, in the description of the premise constituent part, the first to third additional constituent parts, and the embodiment (characteristic constituent part) of the above embodiment , the closing biasing spring 529 (see FIG. 3), rubber, The diaphragm 524b (see FIG. 4), the plunger spring 528b (see FIG. 6), or the check ball 530 (see FIG. 5) is individually used. However, the present invention is not limited to this, and the valve closing holding means (closing biasing spring) As an alternative, two or more types selected from the above-mentioned closing biasing spring 529, rubber diaphragm 524b, and plunger spring 528b may be combined. Further, the above閉付biasing spring 529 as the closed valve maintaining means, rubber diaphragms 524b, and, against the additional components you 1 or 2 or more kinds selected from the plunger spring 528b, on which is a characteristic component The check ball 530 as the blocking means may be further combined.

Moreover, in the said embodiment , although the case where the negative pressure destruction apparatus was applied was shown for the example of the hot water supply apparatus which pours the hot water from the hot water supply circuit 2 into the bathtub 3 through the recirculation circuit 4, it was shown in this. The negative pressure breaking device according to the present invention is applied to a hot water supply device in which the recirculation circuit 4 is omitted, that is, the bath portion is omitted and the hot water supply circuit 2 directly pours water into the bathtub 3. May be. In this case, the “pouring” is hot water of a predetermined temperature.

In the above embodiment , the case where the negative pressure breaking device is applied is described by taking the hot water supply device when the hot water supply destination from the hot water supply circuit 2 is the bathtub 3 as an example, but not limited to this, the pouring from the hot water supply circuit 2 is described. The negative pressure breaking device of the present invention may be applied to a hot water supply device using the hot water as a washing tub. In this case, the same effect can be obtained. In this case, the downstream end of the pouring passage 50 which is a branch passage from the hot water supply circuit 2 is connected to the bottom of the washing tub, and the pouring electromagnetic valves 52 and 52a to 52c are switched by opening and closing. What is necessary is just to be able to automatically pour hot water for washing into the washing tub. The washing tub is a storage tub open to the atmosphere, and the hot water used here becomes miscellaneous water, and it is necessary to prevent backflow as in the case of a bathtub.

Furthermore, the negative pressure breaking device of the present invention can be applied to devices other than the hot water supply device described in the above embodiment . For example, it branches from a water supply line (purified water supply line) or from a pipe line (for example, a purified water supply line such as a water supply circuit that supplies purified water to a water tap) that is supplied with purified water from a water receiving tank by pumping water pressure. When the branch pipe is connected to the bottom of a storage tank open to the atmosphere (for example, the above-described bathtub or washing tub) and water can be poured by opening / closing switching of the water on / off valve, the first to fourth embodiments are added to the branch pipe. Any of the negative pressure breaking devices may be interposed. Also in this case, the backflow from the storage tank to the purified water supply path can be reliably prevented as in the above embodiments.

It is a schematic diagram which shows the hot-water supply apparatus to which embodiment of this invention is applied. It is detailed sectional explanatory drawing of the negative pressure destruction valve of this embodiment. It is detailed sectional explanatory drawing of the pouring solenoid valve which added the 1st addition component to the premise component of embodiment . FIG. 4 is a view corresponding to FIG. 3 of a pouring electromagnetic valve in which a second additional component is added to the prerequisite component of the embodiment . It is a partial expanded sectional explanatory view of the pouring electromagnetic valve to which the characteristic composition part of an embodiment is applied . FIG. 5 is a view corresponding to FIG. 3 of a pouring solenoid valve in which a third additional constituent part is added to the premise constituent part of the embodiment and a conventional pouring solenoid valve.

Explanation of symbols

1,1a-1c Hot water supply device (Applicable to negative pressure breaker)
2 Hot water supply circuit (purified water supply path)
3 Bathtub (storage tank)
22 Heat exchanger (heating source)
23 Combustion burner (heating source)
26a Karan (hot water tap)
26b Shower currant (hot water tap)
50 Pouring path (branch path)
51 Negative pressure release valve 52, 52a-52c Pouring solenoid valve (on / off valve for pouring water)
524 Diaphragm valve 524b Rubber diaphragm (closed biasing spring, valve closing holding means in FIG. 4)
524c Bleed hole 525 Diaphragm chamber 528b Plunger spring (closing biasing spring, valve closing holding means)
529 closing biasing spring (valve closing holding means)
530 Check ball (check element, blocking means)

Claims (7)

A storage tank that is open to the atmosphere is connected to a purified water supply path that is supplied with purified water under a predetermined water supply pressure through a branch path that branches from the purified water supply path, and a negative pressure destruction valve is upstream of the branch path. In addition, an on-off valve for water injection is provided on the downstream side, and the negative pressure release valve is configured to open upon receiving a predetermined negative pressure and suck in outside air. the valve Te vacuum break apparatus odor having a structure in which opening is permitted when subjected to a predetermined pressure in the opposite direction to the injection direction in its closed state,
Upper Symbol water injection on-off valve is provided with a blocking means for blocking the negative pressure when subjected to negative pressure from the water purification supply channel side in the closed state is applied to the valve-opening side with respect to the valve body, the vacuum break The valve opening characteristic that opens when the valve receives negative pressure and the valve opening characteristic that opens when the water injection on / off valve receives reverse pressure are negative when the negative pressure is received from the purified water supply path side. A negative pressure breaking device, wherein the intake pressure starting timing of the pressure breaking valve is related to the opening timing of the water injection on / off valve. A storage tank that is open to the atmosphere is connected to a purified water supply path that is supplied with purified water under a predetermined water supply pressure through a branch path that branches from the purified water supply path, and a negative pressure destruction valve is upstream of the branch path. In addition, an on-off valve for water injection is provided on the downstream side, and the negative pressure release valve is configured to open upon receiving a predetermined negative pressure and suck in outside air. the valve Te vacuum break apparatus odor having a structure in which opening is permitted when subjected to a predetermined pressure in the opposite direction to the injection direction in its closed state,
Upper Symbol water injection on-off valve is provided with a blocking means for blocking the negative pressure when subjected to negative pressure from the water purification supply channel side in the closed state is applied to the valve-opening side with respect to the valve body opposite the pressure As the valve opening operating pressure that will start to open in response to the negative pressure, the negative pressure release valve is set to be larger in absolute value than the set intake operating pressure that receives negative pressure and starts to suck in outside air A negative pressure destruction device characterized by The negative pressure breaking device according to claim 1 or 2 ,
The water injection on-off valve is constituted by a pilot type diaphragm valve, and is configured to guide the water supply pressure from the purified water supply passage to the diaphragm chamber through the bleed hole and to act as a valve closing maintenance pressure on the diaphragm valve which is a valve body. ,
The blocking means is configured by a check element that receives a feed water pressure that is a positive pressure from the purified water supply path side to communicate the bleed hole, and receives a negative pressure from the purified water supply path side to block the bleed hole. There is a negative pressure breaker. The negative pressure breaking device according to claim 1 or 2,
The on-off valve for water injection is constituted by a pilot type diaphragm valve, and is configured to guide the supply water pressure from the purified water supply path to the diaphragm chamber so as to act as a valve closing maintenance pressure on the diaphragm valve which is a valve body, and comprises closing holding means on SL vacuum break valve is kept in a closed state without opening be received at least equal to the negative pressure and the intake operation pressure will start sucking the outside air from the purified water supply path side, The valve closing holding means is a negative pressure breaking device constituted by a closing biasing spring that elastically biases the diaphragm valve toward the closing side . The negative pressure breaking device according to claim 4,
The negative pressure breaking device, wherein the closing biasing spring is arranged to elastically bias the diaphragm valve directly against the valve seat. The negative pressure breaking device according to claim 4,
The negative pressure breaking device, wherein the closing urging spring is configured by an elastic resistance function of the diaphragm valve itself that supports the diaphragm valve so as to be elastically displaceable in the opening and closing direction and maintains the valve closed state. The negative pressure breaking device according to any one of claims 1 to 6 ,
The purified water supply path is a hot water supply circuit that receives purified water and is heated by a heating source to supply hot water to the hot water tap side or a water supply circuit that receives purified water and supplies water to the water tap side, and the hot water supply circuit or water supply circuit On the other hand, a negative pressure breaker in which a storage tank open to the atmosphere is connected to allow for pouring or pouring water through a branch passage.

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