JP2982425B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus for supplying hot water to a bathtub or the like and for recirculating and heating bath water.

[0002]

2. Description of the Related Art Conventionally, this type of bath water heater has a direct connection between a hot water supply path for hot water supply from a water heater to a bathtub and a reheating circuit for circulating and heating the bathtub water, and a water pipe through a hot water supply path for bathtub water. For the purpose of preventing backflow to water, it could not be put into practical use based on water supply regulations such as the Japan Water Works Association and the municipal water supply regulations. For this reason, the connection between the hot water supply path and the additional heating circulation path is configured to have an air opening through a hopper.

For example, in the bath water heater shown in FIG. 4 , when a signal for turning on an automatic hot water switch 1a provided in a bath remote controller 1 provided in a bathroom enters the control device 2, an automatic opening and closing control of the hot water supply passage 3 is performed. Hot water supply valve 4 opens. A water supply channel 7 connected to the hot water supply channel 3 via a heat exchanger 6 of the hot water supply 5 has a water pipe 8
The controller 2 receives the water supply and receives the water amount detection signal from the water amount detector 9 to open the fuel solenoid valve 11 provided in the fuel passage 10 and the fuel control valve 12 for controlling the fuel flow rate, and open the hot water supply burner 14.
To ignite. Tap water flowing into the water supply passage 7 is heated and heated by the heat exchanger 6, and is supplied to the hopper 15 via the automatic hot water supply valve 4. The hopper 15 is provided with an atmosphere opening port 16 and is disposed at a position H higher than the upper end (overflow edge) 17a of the bathtub 17 by a positional difference H. The hot water supply path 3 is connected to a circulation path 18 on the downstream side of the hopper 15, and the circulation path 18 connects the bath tub 17 and the heat exchanger 20 of the reheating device 19 to circulate and heat bath tub water. The sensor 21 provided in the heat exchanger 20 detects the hot water temperature of the circulating water and the water level of the bathtub 17, and when the water level reaches a predetermined level, the automatic hot water supply valve 4 is closed to end the automatic hot water filling operation. Hot water supply path 3 is a branching section 2 on the way
A branch hot water supply path 24 branches from 3 and hot water is supplied from a hot water tap 25 to a kitchen or the like.

The automatic hot water supply valve 4 and the hopper 15 are connected as shown in FIG. 5 , and the automatic hot water supply valve 4 presses the diaphragm valve 30 against the valve seat 31 to close the valve. The diaphragm valve 30 is made of a flexible diaphragm 2 such as a rubber material reinforced with fibers.
6. A pressure receiving plate 27 in contact with the diaphragm 26, the diaphragm 26 and the pressure receiving plate 27 are fixed, and a fixing pin 28 having a water passage hole 28a in the center is provided. Then, the diaphragm valve 30 can move up and down by the deformation of the R portion 26a of the diaphragm 26. Further, the diaphragm valve 30 includes a pilot water hole 34 that communicates the water inlet 32 with the diaphragm chamber 33. The diaphragm valve 30 also includes a pilot water hole 37 communicating the outlet portion 35 and the diaphragm chamber 33 at the center, and the pilot water hole 37 is closed by a plunger rubber 39 welded to a plunger 38 when the valve is closed as shown. The plunger 38 is watertightly closed by a cylinder 40 in the diaphragm chamber 33.
When the energization of the coil 41 is stopped, the diaphragm valve 30 receives the urging force of the spring 42 and the diaphragm valve 30 is closed.
To block the flow of water between the inlet 32 and the outlet 35.
When the diaphragm valve 30 is closed, the valve opening force P (upward force) and the valve closing force Q acting on the diaphragm valve 30
(Downward force) indicates the pressure receiving area and water pressure of the inlet 32, the diaphragm chamber 33, and the outlet 35 in the state shown in the figure, respectively, p1,
Assuming that p2, p3 (Kg / cm2), S1, S2, S3 (cm2), P = p1 * S1 + p3 * S3, Q = p2 * S2
+ F. Here, F is the biasing force of the spring 42. Then, the closing force ΔQ of ΔQ = Q−P acts positively. The pressure p3 is equal to the atmospheric pressure when water is not flowing, and is 0.
It shows Kg / cm2.

[0005]

[SUMMARY OF THE INVENTION However, in the above structure has a problem as follows.

When the hot water tap 25 is opened and closed and hot water is supplied in a kitchen or the like, for example, when the water supply pressure of the water pipe 8 is high, when the hot water tap 25 is rapidly closed with a lever switch type hot water tap 25 or the like, a so-called branch hot water supply path 24 is provided. An excessive pressure wave is generated based on the water hammer phenomenon. This pressure wave also spreads to the hot water supply channel 3 connected at the branch portion 23, acts on the inlet portion 32 of the diaphragm valve 30 abruptly, delays the pressure transmission to the diaphragm chamber 33 through the pilot water hole 34, and delays the p1 Due to the increase, the closing force ΔQ acts negatively. For this reason, a sudden and excessive pressure acts on the diaphragm 26, and the R portion 26a
In some cases, excessive deformation occurred, and the R portion 26a gradually became fatigued and eventually damaged. In addition, the water
-High pressure due to the hammer phenomenon is applied to the diaphragm valve inlet.
In other words, the pressure on the water inlet side of the diaphragm valve instantaneously
Pressure propagation delay due to small diameter
Diaphragm chamber valve opens instantly
Then flows downstream. This repetition, ie hot water supply in kitchens etc.
The amount of water leakage increases due to the number of times the tap is opened and closed, and there is no water in the bathtub
It is said that water accumulates in the bathtub even when the hot water is not operating
There was a problem.

In order to solve the above-mentioned problems , the present invention protects the diaphragm from high pressure caused by other hot water supply and prevents water leakage from the diaphragm valve.
It stops.

[0008]

Means for Solving the Problems In order to achieve the above object , a hot water supply apparatus of the present invention uses a hot water supply burner to supply water.
Equipped with a heat exchanger for heating, branching the outlet side of the heat exchanger
One side is connected to a hot water tap in a kitchen or washroom, etc.
The other, while controlling the hot water supply with the diaphragm valve,
The inside and outside of the valve shut off with a diaphragm valve are communicated with a small diameter,
Automatic hot water supply with a pilot water hole that opens and closes the valve slowly
A pressure buffer valve is provided on the inlet side of the valve.

[0009]

SUMMARY OF] The onset light of the water heater, the other hot water supply is performed in hot water passage between the water heater and an automatic hot water supply valve when the diaphragm valve is closed, water tap lever openable like finished hot water When the valve is rapidly closed, the hot water supply path becomes a closed circuit, and the rapid valve closing operation causes a so-called water hammer phenomenon at the hot water tap inlet. Due to this phenomenon, a pressure fluctuation wave that is higher than the steady hot water supply pressure and changes in a short cycle is propagated in the closed circuit. At this time, the pressure buffer valve provided on the inlet side of the automatic hot water supply valve absorbs and buffers the pressure fluctuation wave to reduce the high pressure, thereby preventing the pressure fluctuation wave from being applied to the diaphragm valve. In this way, it is possible to prevent the diaphragm valve from being damaged due to the application of a shocking high pressure that cannot propagate the pressure at the valve inlet side into the valve for a short time through the pilot water hole of the diaphragm valve , and the valve inlet pressure is instantaneously increased.
The automatic hot water supply valve, which is higher than the pressure and can prevent a small amount of outflow due to instantaneous valve opening , can close the valve slowly and reduce the valve opening driving force, can be effectively employed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hot water supply apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The same parts as those of the conventional example are denoted by the same reference numerals and have the same functions, and the configuration will be described mainly on the parts different from the conventional example. The hot water heated by the heat exchanger 6 of the water heater 5 is supplied to a spring 45a as a pressure buffer valve provided with the hot water supply path 3 toward the downstream side.
Check valve 45, automatic hot water supply valve 4, hopper 46, check valve 62, venturi 47
Then, hot water is supplied to the bathtub 17 through the circulation path 18. As shown in FIG. 2 (the left side of the center line in the figure indicates a water stop state, and the right side indicates a state at the time of automatic hot water supply), the hopper 46 includes a water passing portion 50 into which hot water flows from the automatic hot water supply valve 4 and a water passing portion 50. A water receiving tray 53 as a drain valve having a water flow hole 51 on the bottom surface for receiving hot water therein and fixing a valve rubber 52, and a valve seat 52 for receiving water when the water receiving amount of the water receiving tray 53 is a predetermined amount or less. It has a spring 55 that pushes up from 54. Further, a drainage portion 57 is provided at a lower portion via a partition wall 56, and the valve rubber 52 is opened to open the water passage portion 50.
Through the water hole 58. The drainage part 57 has an air opening 60 for opening the drainage part 57 to the outside air at the top and a drainage opening 57a at the bottom.

A venturi 47 is connected downstream of the outlet 61 of the water passage 50 through a check valve 62. As shown in FIG. 3, the venturi 47 causes the hot water of the speed v1 flowing from the non-return valve 62 to reduce the negative pressure inducing portion 65, which has been reduced from the diameter φd1 of the water passage section to φd2, to the speed v2 proportional to the diameter ratio d1 / d2. It is accelerated to pass. Negative pressure attraction unit 6
In the case of No. 5, the flow velocity v2 is increased and the flow loss is reduced to the passage length l.
Occurs in proportion to Therefore, the passage length l is equal to the negative pressure pipe 66.
At the level where an appropriate negative pressure V is generated in the opening 67 of
Return to the diameter φd3 which is close to or equal to the diameter φd1 again,
Outflow is performed at a flow velocity v3 close to the flow velocity v1. The negative pressure pipe 66 and the drain port 57a of the drain section 57 are connected by a drain channel 68, and a check valve 69 is provided in the drain channel 68. Then, the drainage portion 57 is acted upon by the action of the negative pressure V through the check valve 69.
Is sucked into the negative pressure pipe 66. An air opening 57 a of the drainage section 57 is opened to the atmosphere by an air pipe 70 at an opening 72 outside the bath water heater 71. The controller 73 also receives the signal of the water level detector 59.

With the above configuration, when the automatic hot water supply valve 4 shown in FIG. 2 is closed, the coil 41 is not energized, and the plunger 38 presses the pilot water hole 37 of the diaphragm valve 30 by the pressing force of the spring 42. The plunger is closed by a plunger rubber 39 provided at the tip of the plunger. The diaphragm valve 30 communicates the diaphragm chamber 33 with the water inlet 32 through the pilot water hole 34, and maintains the water pressures p1 and p2 at the same pressure p1 = p2. On the other hand, the diaphragm valve 30
The outlet 35 has no pressure of p3 = 0 when no water flows. The diaphragm valve 30 acts on the pressure receiving areas S1 and S2 of the pressures p1 and p2, and P = p1 * S1, Q = p2 S2 +
Receive the power of F. F is the biasing force of the spring 42,
The closing force of ΔQ = Q−P is set to a positive value.

In this state, a hot water tap 25 provided in a kitchen, a washroom, a bathroom, or the like is opened, and the internal pressure of the hot water supply path 3 communicating with the hot water supply branch path 24 decreases. However, since the check valve 45 closes to close the inlet section 32, there is no backflow from the inlet section 32 and the pressure p1 does not decrease. Even if the supply pressure of the water pipe 8 drops and the pressure p1 escapes from the check valve 45 and p1 = p2 = 0, the closing force of the diaphragm valve 30 remains as ΔQ = F. Next, when the feed water pressure returns to normal and the pressure p1 at the inlet 32 acts on the diaphragm valve 30, the hot water does not leak to the outlet 35 because F ≧ p1 × S1.

As the hot water tap 25 used in the kitchen, a lever-type appliance with good operability is frequently used.
No. 5 has a high valve closing speed which is hardly generated by a rotary hot water tap when the lever is operated quickly. Then, at this time, a so-called water hammer phenomenon occurs at the inlet of the hot water tap 25, changes in the hot water supply branch 24 in a short cycle, and generates a pressure fluctuation wave having a considerably higher pressure than the hot water supply pressure in a steady state. This pressure fluctuation wave spreads from the hot water supply branch passage 24 to the hot water supply passage 3, and applies an impressive high pressure to both of the passages 24 and 3.
For example, when the support of the hot water supply path 3 is weak, severe vibration is accompanied. The backflow prevention valve 45 buffers the pressure in the narrow path of the valve closing portion 45b, has a pressure buffering effect further by the biasing force of the spring 45a, absorbs the high pressure of the pressure fluctuation wave, lowers the pressure, and reduces the pressure to the diaphragm valve 30. It is possible to prevent excessive deformation of the R portion 26a due to sudden high pressure application, prevent fatigue due to repeated deformation of the diaphragm 26, and suppress breakage. Ma
The small amount of water leakage due to the instantaneous opening of the diaphragm valve
You. It should be noted that the air pipe 70 should be closed and the check valve 6 should be closed.
At the time of non-operation of 2, 69, backflow of bathtub water to hot water supply path 3 can also be prevented.

[0016]

As described above, according to the first aspect of the present invention, the pressure buffer valve provided on the inlet side of the automatic hot water supply valve is higher than the steady hot water supply pressure generated in the hot water supply path, and The pressure fluctuation wave having a short cycle can be absorbed and buffered to reduce the pressure fluctuation, the direct application of the pressure fluctuation wave to the diaphragm valve can be prevented, and the fatigue damage due to the repetitive excessive deformation of the diaphragm can be suppressed. Diaphragm valve with instantaneous opening
Prevents a small amount of water from leaking out of the bathtub
There is no complaint that the bathtub is filled with water.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a hot water supply device of the present invention.

FIG. 2 is a sectional view of the automatic hot water supply valve and a hopper.

FIG. 3 is a cross-sectional view of the venturi.

FIG. 4 is a configuration diagram of a conventional hot water supply device.

FIG. 5 is a sectional view of the automatic hot water supply valve and a hopper.

[Explanation of symbols]

 3 Hot Water Supply Channel 4 Automatic Hot Water Supply Valve 45 Check Valve (Pressure Buffer Valve) 46, 75 Hopper 47 Venturi 50, 77 Water Flow Section 57, 78 Drain Section 62, 68 Check Flow Valve 65, Negative Pressure Inducing Section

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-35283 (JP, A) JP-A-1-255775 (JP, A) JP-A-50-117025 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) F24H 1/00 602

Claims (1)

(57) [Claims] 1. A heat exchanger for heating supply water by a hot water supply burner.
And branch off the outlet side of this heat exchanger, one of which is a kitchen
The pipe is extended and connected to a hot water tap in a bathroom or a washroom, and the other is controlled by a diaphragm valve to control hot water supply and shut off by a diaphragm valve. Pressure relief on the inlet side of the automatic hot water supply valve with
A hot water supply device provided with an impulse valve .