JPH0587410A - Hot water feeding device - Google Patents

Abstract

(57) [Summary] [Purpose] A large amount of hot water heated by a water heater can be supplied to a bathtub, etc. in a short time by using direct water pressure, and the backwater of the bathtub is prevented from flowing back into the water pipe. In view of the above, there is provided a hot water supply device capable of freely designing and enforcing the height position of the hot water supply device with respect to the bathtub. [Structure] The hot water obtained by heating the inflow water from the water pipe 8 and the water supply passage 7 by the hot water supply heat exchanger 6 is controlled from the hot water supply passage 3 by the check valve 45 and the hot water supply, which have pressure buffering and check performance. A hopper 46 that closes the automatic hot water supply valve 4 and the water receiving valve 53 with a predetermined amount of water to shut off from the atmosphere opening port 72, and opens the water receiving valve 53 to stop the hot water supply passage 3 to the atmosphere when water flow is stopped, Via the check valve 62, the venturi 47 for collecting the water leak of the water receiving valve 53 from the drainage channel 68, and the check valve 69 of the drainage channel 68,
Hot water is supplied from the circulation path 18 to the bathtub 17 by the water supply pressure of the water pipe 8, and the backflow prevention valves 62 and 68 prevent the backflow of bath water even if there is a head difference H ₁ .

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 device for supplying hot water to a bathtub or the like, and circulatingly heating the bath water to reheat it.

[0002]

2. Description of the Related Art Conventionally, in this type of bath water heater, a hot water supply passage for hot water supply from a water heater to a bathtub and a reheating circulation passage for circulating water in the bathtub are directly connected to each other via a water pipe for the bathtub water. In order to prevent backflow to the water supply, it could not be put into practical use based on the water supply regulations of the Japan Water Works Association and municipal water supply ordinances. For this reason, the connection between the hot water supply passage and the additional heating circulation passage has a structure having an atmosphere opening port via a hopper.

For example, in the bath water heater shown in FIG. 5, when a signal for turning on the automatic water filling switch 1a provided in the bath remote controller 1 provided in the bathroom enters the control device 2, the bath water heater 3 is automatically opened and closed. The hot water supply valve 4 opens. The water supply passage 7 connected to the hot water supply passage 3 via the heat exchanger 6 of the water heater 5 has a water pipe 8
The controller 2 which receives the water supply from the water detector 9 and receives the water detection signal from the water detector 9 opens the fuel solenoid valve 11 provided in the fuel passage 10 and the fuel control valve 12 for controlling the fuel flow rate to open the hot water supply burner 14.
Light up. The 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 16 and is arranged at a height higher than the upper end (overflow edge) 17a of the bath 17 by a positional difference H. The hot water supply passage 3 is connected to the circulation passage 18 on the downstream side of the hopper 15, and the circulation passage 18 connects the bath 17 and the heat exchanger 20 of the reheating device 19 to circulate and heat the bath 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. When the water level reaches a predetermined level, the automatic hot water supply valve 4 is closed and the automatic hot water filling operation is finished. Hot water supply channel 3 is a branch point 2 on the way
The branch hot water supply path 24 is branched from 3, and hot water is also supplied to the kitchen or the like from the hot water tap 25.

The automatic hot water supply valve 4 and the hopper 15 are connected as shown in FIG. 6, and the automatic hot water supply valve 4 closes the valve by pressing the diaphragm valve 30 against the valve seat 31. The diaphragm valve 30 is a flexible diaphragm 2 such as a rubber material reinforced with fibers.
6, a pressure receiving plate 27 that is in contact with the diaphragm 26, a fixing pin 28 that fixes the diaphragm 26 and the pressure receiving plate 27, and has a water passage hole 28a in the center, and is watertightly supported by the valve body 29. 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 is provided with a pilot water passage hole 34 that connects the water inlet 32 and the diaphragm chamber 33. The diaphragm valve 30 is also provided with a pilot water passage hole 37 at the center thereof, which communicates the outlet portion 35 with the diaphragm chamber 33. When the valve is closed, the pilot water passage hole 37 is closed by the plunger rubber 39 welded to the plunger 38. The plunger 38 is watertightly sealed by the cylinder 40.
When the energization of the coil 41 isolated from the valve is stopped, the diaphragm valve 30 receives the urging force of the spring 42 and the valve seat 31
To block water flow between the inlet portion 32 and the outlet portion 35.
When the diaphragm valve 30 is closed, the valve opening force P (upward force) and the valve closing force Q that act on the diaphragm valve 30.
(Downward force) is the pressure receiving area and water pressure of the inlet portion 32, the diaphragm chamber 33, and the outlet portion 35 in the state shown in the figure, respectively p ₁ ,
If p ₂ , p ₃ (Kg / cm ² ), S ₁ , S ₂ , S ₃ (cm ² ), then P = p ₁ × S ₁ + p ₃ × S ₃ , Q = p ₂ × S ₂
It becomes + F. However, F is the urging force of the spring 42. Then, the closing force ΔQ of ΔQ = Q−P acts positively. The above-mentioned pressure p ₃ becomes atmospheric pressure when water is not flowing and is 0.
It shows Kg / cm ² .

[0005]

However, the above structure has the following three problems.

[0006] The first point is that the water heater 5 and the additional heating device 19
The bath water heater M configured by the above is usually installed adjacent to the bathtub 17 outside the bathroom wall. At this time, the installation surface G and the bathtub 1
The distance H ₀ of the upper end 17a of 7 depends on the position of the installation surface G and the bathtub 1
It changes variously depending on the position, depth, etc. of 7. Then, in order to secure the positional difference H and prevent the backflow of the bath water to the atmosphere opening port 16, the installation surface G is raised by mortar coating or the like for each installation example, or the mortar is peeled off to lower the installation surface. Adjustment was needed.

The second point is that when the hot water supply tap 25 is opened and closed to supply hot water in the kitchen, for example, when the water supply pressure of the water pipe 8 is high and the water supply tap 25 is rapidly closed by the lever switch type hot water supply tap 25, the branch hot water supply is performed. An excessive pressure wave due to the so-called water hammer phenomenon is generated in the passage 24. This pressure wave also propagates to the hot water supply passage 3 connected by the branch portion 23, and suddenly acts on the inlet portion 32 of the diaphragm valve 30 to delay the pressure transmission to the diaphragm chamber 33 through the pilot water passage hole 34.
The closing force ΔQ acts negatively due to the excessive increase of p ₁ . Therefore, a sudden and excessive pressure acts on the diaphragm 26 to cause an unreasonable deformation of the R portion 26a, and gradually the R portion 26a is gradually deformed.
There was a case where he was tired and eventually damaged.

As a third point, a case where a diaphragm 26 made of rubber is fixed to a valve seat 31 made of brass due to deterioration of rubber, and conversely, dust or SiO ₂ contained in tap water on the valve seat 31 is used. The above-mentioned impurities adhered to the valve, resulting in poor valve closing, resulting in continuous leaking of water.

In order to solve the above-mentioned three problems, the first object of the present invention is to eliminate the need for adjusting the height position of the hopper, and the second object to solve the other problems. The diaphragm is protected from the high pressure generated by use, and the third purpose is to eliminate the drain valve of the water passage part to provide the same function.

[0010]

In order to achieve the above-mentioned second object, the first means of the hot water supply apparatus of the present invention comprises:
A pilot water hole that is installed in the hot water supply path of the water heater to control hot water with a diaphragm valve, and uses a small diameter to connect the inside and outside of the valve that shuts off with the diaphragm valve to reduce the power supply for opening the valve and to open and close the valve slowly. Equipped with an automatic hot water supply valve with a pressure buffer valve that closes the diaphragm valve and that occurs when the hot water supply passage is a closed circuit, is higher than the steady hot water supply pressure in the hot water supply passage, and buffers pressure fluctuation waves in a short cycle. It is provided in the hot water supply passage on the inlet side of the automatic hot water supply valve.

Further, in order to achieve the first object,
The second means of the hot water supply device of the present invention is a drainage part having an atmosphere opening port lower than the water level of the bathtub and a drainage port for storing water in the lower part, and a drain valve is closed to pass water when passing water. , Equipped with a hopper that has a water passage that opens the drain valve when water is not flowing to drain residual water to the drain, and connects the circulation path of the bath to a reheating device that circulates and heats the water in the bath. Connect the end to the water heater and fill the bathtub with hot water in order to supply water from the water heater side.
Equipped with an automatic hot water supply valve that controls the opening and closing of the hot water supply passage, a water passage of the hopper, a check valve for hot water supply to the water heater side, and a venturi. The drainage port of the section is connected by a drainage channel, and a check valve for preventing drainage to the drainage port side is provided in the middle of the drainage channel.

Further, in order to achieve the above-mentioned third object, the third means of the hot water supply apparatus of the present invention is provided with an inlet and an outlet for water passage, and the suction water amount of the negative pressure attracting portion of the venturi. The following is provided with a water leaking part for leaking water, and a partition wall connecting with the drainage part and having a water passing part having a water leaking hole.

[0013]

With the above first means, the hot water supply apparatus of the present invention performs other hot water supply in the hot water supply path between the hot water supply device and the automatic hot water supply valve when the diaphragm valve is closed, and when the hot water supply is completed, the lever is opened and closed. When the hot-water tap of the formula or the like is rapidly closed, the hot-water supply passage becomes a closed circuit, and a so-called water hammer phenomenon occurs at the hot-water tap inlet due to the rapid valve closing operation. Due to this phenomenon, a pressure fluctuation wave that is higher than the steady hot water supply pressure and that changes with 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 high pressure, and prevents the pressure fluctuation wave from being applied to the diaphragm valve. Thus
The pressure on the valve inlet side cannot be propagated into the valve in a short time through the pilot water passage of the diaphragm valve.The diaphragm valve can be prevented from being damaged due to the application of shock high pressure, and the valve can be closed and opened slowly. The automatic hot water supply valve that can reduce the driving force can be effectively adopted.

In the hot water supply apparatus of the present invention by the second means, when the automatic hot water supply valve is opened, hot water is supplied from the water heater to the bathtub through the hot water supply passage and the circulation passage. At this time, a negative pressure is generated in the negative pressure attracting portion of the venturi by the hot water passing water, and this negative pressure acts on the drain port of the drain portion of the hopper via the drainage channel. The drain valve of the water passage part leaks a small amount of hot water to the drain part at the time of opening the passage of water, and the leak of the water passage part received by the drain part is the negative pressure attraction part due to the negative pressure action of the negative pressure attraction part. Is inhaled and collected in a bath. After sucking the leaked water from the drainage part, the outside air is sucked into the negative pressure attraction part from the atmosphere opening port of the drainage part. Also,
Even if the drain valve fails to close properly, the leak due to the valve closing failure is also collected in the bath, as in the case of the leakage intake of the drain valve. At the time of this hot water supply, the water passage part is substantially cut off from the drain part by the drain valve, and the hot water supply pressure from the water heater is directly applied to the hot water supply passage, so that the hot water supply to the bathtub can be performed at a large flow rate in a short time.
When hot water supply is completed and the automatic hot water supply valve is closed, head pressure equivalent to the filling water level is applied from the bathtub to the hot water supply channel and the drainage channel respectively, but the backflow prevention valves provided in both channels operate to activate the atmosphere. It is possible to prevent overflow from the opening. In this way, even if the air opening of the hopper is lower than the water level of the bathtub, hot water can be supplied by using the water supply pressure of the water heater to the bathtub, and the height position of the hopper with respect to the bathtub need not be adjusted. It is possible to comply with water supply regulations and rationalize installation work.

Further, according to the third means, the hot water supply apparatus of the present invention constantly leaks a small amount of a part of the water passing through the water leakage hole to the drainage section while passing water through the water passing section of the automatic hot water supply valve. The drainage section is always subjected to a negative pressure by the negative pressure attraction section of the venturi, and the diameter of the leakage hole is set so that the leaked water is less than the suctionable water volume of the negative pressure attraction section, and the leaked water is collected in the drainage section. Therefore, the water is not overflowed from the atmosphere opening and is always collected in the hot water supply passage. In this way, the venturi constantly generates negative pressure in the automatic hot water supply valve while water is flowing, which simplifies the configuration by eliminating the need for a drain valve in the water flow section, and is unique to the on-off valve such as sticking or poor closing of the valve section. Stabilization of performance can be expected by eliminating the occurrence of the problem.

[0016]

Embodiments of the 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, in which the same parts as those of the conventional example are designated by the same reference numerals and have the same functions, and the structure will be described focusing on the parts different from the conventional example. The hot water heated by the heat exchanger 6 of the water heater 5 has a spring 45a as a pressure buffer valve provided with the hot water supply passage 3 toward the downstream side.
Backflow preventive valve 45, which has been pre-loaded with the pre-load, automatic hot water supply valve 4, hopper 46, backflow preventive valve 62, venturi 47
The water is supplied to the bathtub 17 through the circulation path 18 via the. The hopper 46, as shown in FIG. 2 (the left side from the center line of the drawing shows the water supply stopped state, the right side shows the state during automatic hot water supply), and the water passage portion 50 into which hot water flows from the automatic hot water supply valve 4 and this It has a water hole 51 at the bottom for receiving hot water inside and has a water receiving tray 53 as a drain valve to which a valve rubber 52 is fixed, and a valve seat for holding the valve rubber 52 when the amount of water received by the water receiving tray 53 is below a predetermined amount. It has a spring 55 that pushes up from 54. In addition, a drainage portion 57 is provided in the lower portion through the partition wall 56, and the valve rubber 52 is opened so that the water passage portion 50 is opened.
Water leaks through the water passage hole 58. The drainage portion 57 has an atmosphere opening port 60 that opens the drainage portion 57 to the outside air, and a drainage port 57a at the bottom portion.

A venturi 47 is connected downstream of the outlet 61 of the water passage portion 50 via a check valve 62. Venturi 47, as shown in FIG. 3, the hot water of the velocity v ₁ flowing from the check valve 62 is, aperture ratio negative pressure attraction portion 65 of reduced from diameter .phi.d ₁ to .phi.d ₂ water passage cross-section d ₁ / d ₂ The vehicle is accelerated to a velocity v ₂ proportional to Negative pressure attraction unit 6
5, the flow velocity v ₂ increases and the water flow loss becomes the passage length l.
Occurs in proportion to. Therefore, the passage length l is determined by the negative pressure pipe 66.
Suppress at a level at which an appropriate negative pressure V is generated in the opening 67 of
Return to a diameter φd ₃ that is close to or equal to the diameter φd ₁ .
Flow out at a flow velocity v ₃ close to the flow velocity v ₁ . The negative pressure pipe 66 and the drainage port 57a of the drainage part 57 are connected by a drainage channel 68, and a check valve 69 is installed in this drainage channel 68. Then, the drainage portion 57 is operated by the action of the negative pressure V via the check valve 69.
Water is sucked into the negative pressure pipe 66. The atmosphere opening 57a of the drainage portion 57 is opened to the atmosphere by the air pipe 70 from the bath water heater 71 and the outside opening 72. The controller 73 also receives the signal from the water level detector 59.

With the above structure, when the automatic hot water supply valve 4 shown in FIG. 2 is closed, the coil 41 is de-energized and the plunger 38 presses the spring 42 to press the pilot water passage 37 of the diaphragm valve 30. It is closed by a plunger rubber 39 provided at the tip of the plunger 38. The diaphragm valve 30 connects the diaphragm chamber 33 and the water inlet 32 through the pilot water passage 34, and maintains the water pressures p ₁ and p ₂ at both places at the same pressure p ₁ = p ₂ . On the other hand, the diaphragm valve 30
At the outlet portion 35 of p, the pressure becomes p ₃ = 0 when no water is passed. The diaphragm valve 30 acts on the pressure receiving areas S ₁ and S ₂ of the pressures p ₁ and p ₂ , and P = p ₁ × S ₁ and Q = p ₂ S ₂ +
Receive the power of F. F is the urging force of the spring 42,
The closing force of ΔQ = Q−P is set to a positive value.

In this state, the hot water supply tap 25 provided in the kitchen, washroom, bathroom or the like is opened, and the internal pressure of the hot water supply passage 3 communicating with the hot water supply branch passage 24 is reduced. However, since the check valve 45 closes and closes the inlet portion 32, there is no backflow from the inlet portion 32 and the pressure p ₁ does not decrease. Even if the water supply pressure of the water pipe 8 drops and the pressure p ₁ escapes from the check valve 45 and p ₁ = p ₂ = 0, ΔQ = F and the closing force of the diaphragm valve 30 remains. Next, when the water supply pressure returns to normal and the pressure p _{1 at the} inlet portion 32 acts on the diaphragm valve 30, F ≧ p ₁ × S ₁ is set, so hot water does not leak to the outlet portion 35. ..

As the hot-water tap 25 used in the kitchen, a lever-type device with good operability has come to be widely used.
No. 5 has a high valve closing speed that is unlikely to occur in a rotary hot water tap when the lever is operated quickly. At this time, a so-called water hammer phenomenon occurs at the inlet of the hot water supply tap 25, changes in a short cycle in the hot water supply branch passage 24, and a pressure fluctuation wave having a pressure considerably higher than the hot water supply pressure at the steady state is generated. This pressure fluctuation wave spreads from the hot water supply branch passage 24 to the hot water supply passage 3 as well, and impulsively high pressure is applied to both of the passages 24 and 3.
For example, when the support of the hot water supply passage 3 is weak, violent vibration is accompanied. The check valve 45 buffers the pressure in the narrow path of the valve closing portion 45b, and further has a pressure buffering effect by the urging force of the spring 45a, absorbs the high pressure of the pressure fluctuation wave and lowers the pressure to the diaphragm valve 30. It is possible to prevent the R portion 26a from being deformed unnecessarily due to a sudden application of a high voltage, and to prevent fatigue due to repeated deformation of the diaphragm 26 to suppress damage. In addition, in the unlikely event that the air pipe 70 is blocked, the check valves 62, 69
It is also possible to prevent backflow of the bath water to the hot water supply passage 3 when the operation of No.

Next, when the switch 1a of the remote controller 1 is turned on to start the operation of filling the bathtub 17 with hot water, the automatic hot water supply valve 4 is opened and the hot water is supplied to the water receiving tray 53, so that the water receiving tray 53 is closed. When the amount of water received increases and the spring 55 is compressed to reach a predetermined amount of water received, the valve rubber 52 is pressed against the valve seat 54, and the water passage 5
0 and the drain part 57 are shut off. While the amount of received water reaches a predetermined amount, a part of the hot water supply leaks from the water passage holes 51 and 58 and is collected in the drainage unit 57. Then, the outlet 61 of the water passage 50
The hot water that has passed through passes through the check valve 62, the venturi 47, the circulation path 18, and reaches the bathtub 17. The leaked water from the water passage portion 50 collected in the drainage portion 57 is recovered from the drainage passage 68 to the hot water supply passage 3 by the action of the negative pressure attracting portion 65 of the venturi 47. After that, the venturi 47 sucks the outside air through the opening 72. At this time, even if water is constantly leaked between the valve rubber 52 and the valve seat 54 due to clogging of dust or adhesion of impurities such as SiO ₂ in tap water, if the amount of water is less than the attractable water amount of the negative pressure attracting portion 65, the opening 72 is used. It is collected without flooding to the outside.
The amount of water that can be attracted is based on the diameter ratio d ₁ / d ₂ and the passage length l.
It can be adjusted freely according to the value such as.

When the controller 73 which receives the detection signal of the water level detector 21 when the water level in the bathtub 17 reaches a predetermined water level closes the automatic hot water supply valve 4, the hot water in the water receiving tray 53 leaks from the water passage hole 51. Becomes less than a predetermined amount and the spring 55 causes the water tray 53 to
Is pushed up to separate the valve rubber 52 from the valve seat 54. Then, the water leaked from the water passage hole 51 of the water receiving tray 53 is
It is drained from 8 to the drain part 57. When the drainage is completed, the water passage portion 50 and the drainage portion 57 communicate with each other through the water passage hole 58, and the water passage portion 50 is opened to the outside air through the atmosphere opening port 60, the air pipe 70, and the opening port 72. Even if the positional difference H ₁ between the water surface B filled with water in the bathtub 17 and the opening 72 occurs, the check valve 6
2, 68 prevent backflow of bath water into the hopper 46.
As described above, even when the opening 72 of the hopper 46 is located below the water level B of the bathtub 17, the hot water supply passage 3 is shut off from the outside air at the time of water flow and the water supply pressure of the water pipe to the heat exchanger 6 is utilized. It is possible to supply hot water, and when the water supply is stopped, it is possible to prevent backflow of the bath water to the water pipe 8 through the hot water supply passage 3, and it is possible to comply with water supply regulations. Moreover, it is not necessary to adjust the depth of the bathtub 17 or the positional relationship between the bathtub 17 and the height of the bath water heater 71.
The design efficiency of the water heater increases. In addition, when the diameter of the opening 72 is not controlled and the waste water is not collected, the air suction amount can be adjusted by the water leak detection signal to control the wasteful cooling of the bath water due to the mixing of the air into the bath 17.

FIG. 4 shows another embodiment of the present invention, in which a hopper 75 is partitioned by a partition wall 76 into an upper water passage portion 77 and a lower water drain portion 78. A water leak hole 79 is provided in the partition wall 76, and a part of the hot water supply flows into the drainage chamber 81 of the drainage unit 78 from the water passage chamber 80 by the hot water supply pressure of the hot water supply passage 3. The diameter φd _x of the water leakage hole 79 is designed and set so that this inflow amount is equal to or less than the suctionable water amount of the negative pressure inducing portion 65 of the venturi 47.
The water passage portion 77 has an inflow port 82 and an outflow port 83 for water passage as in the previous example, and the drainage portion 78 has an atmosphere opening port 84 and a drainage port 85. Then, when the automatic hot water supply valve 4 is opened to pass water, hot water is mainly passed from the outflow port 83 and from the drain port 85 to the sub water. In this way, the water receiving tray 53 of the above-described embodiment is not required, and the configuration can be simplified, and the water receiving tray 5 can be used.
By eliminating the drive mechanism that shuts off / opens the water passage 77 and the drain 78 in 3 above, it is possible to completely eliminate the problems inherent to the on-off valve, such as sticking or poor closing of the valve, and stabilizing the performance. Can be expected. Further, since the water receiving tray 53 is not housed in the water passage chamber 80 at least, the water passage chamber 80 can be made compact.

The automatic hot water supply valve 4 of the present invention is the hopper 4.
It is not limited to the water flow to 6, 75, for example, water may be flowed to the hot water supply valve which is open to the atmosphere without valves for supplying hot water from the upper part of the bathtub. Further, a plurality of shock absorbers may be provided in the same hot water supply passage, and the pressure buffer valve can prevent a shock wave due to a water hammer generated by the closing operation of other hot water taps. Further, the pressure buffer valve is not limited to the above-mentioned check valve, and may be a simple pressure buffer valve.

[0026]

As described above, according to claim 1 of the hot water supply apparatus 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 passage, and The pressure fluctuation wave having a short cycle is absorbed and buffered to be reduced, direct application of the pressure fluctuation wave to the diaphragm valve is prevented, and fatigue damage due to repeated excessive deformation of the diaphragm can be suppressed.

Further, according to the second aspect of the present invention, when the automatic hot water supply valve passes water, the drain valve shuts off the water passage portion and the drain portion, and direct connection water supply utilizing the tap water supply pressure to the water heater is possible for a short time. Since a large amount of hot water is supplied to the hopper and the backflow prevention valve prevents backflow of bath water to the hopper when water flow is stopped, there is no need to adjust the height of the hopper to the tub, facilitating the design and implementation of the device, and complying with water laws and regulations. It will be possible.

Further, according to the third aspect of the present invention, the structure of the water passage portion can be simplified by the suction action of the venturi, and the occurrence of problems inherent to the on-off valve such as sticking of the valve portion and improper closing of the valve portion can be eliminated. Stabilization can be expected.

[Brief description of drawings]

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

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

FIG. 3 is a sectional view of the venturi.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional hot water supply device.

FIG. 6 is a sectional view of the automatic hot water supply valve and the hopper.

[Explanation of symbols]

 3 Hot water supply passage 4 Automatic hot water supply valve 45 Backflow prevention valve (pressure buffer valve) 46,75 Hopper 47 Venturi 50,77 Water passage part 57,78 Drainage part 62,68 Backflow prevention valve 65 Negative pressure attraction part

Claims (3)

[Claims] Claim: What is claimed is: 1. An automatic system having a pilot water passage for controlling a hot water supply by a diaphragm valve provided in a hot water supply passage of a water heater and communicating the inside and outside of the valve closed by the diaphragm valve with a small diameter and slowly opening and closing the valve. The automatic hot water supply valve is equipped with a hot water supply valve, which is generated when the diaphragm valve is closed and the hot water supply path is a closed circuit, which is higher than the steady hot water supply pressure of the hot water supply path and which buffers pressure fluctuation waves of short cycle. A hot water supply device, which is provided in a hot water supply passage on the entrance side. 2. A drainage part having an atmospheric opening and a drainage port for storing water at a lower position below the water level of the bathtub, and a drainage valve closed when water is passed to allow water to pass therethrough. Equipped with a hopper with a water passage that drains residual water to the drainage part, connects the circulation path of the bath to the reheating device that circulates and heats the bath water, and connects the other end to the water heater. The hot water supply path for supplying hot water to the bathtub is equipped with an automatic hot water supply valve that controls the opening and closing of the hot water supply path in order from the water heater side, a water passage part of the hopper, a backflow prevention valve for the hot water supply to the water heater side, and a venturi. A hot water supply device comprising a drainage port of the drainage part connected to the opening of the negative pressure guide part having a reduced cross section of the drainage path by a drainage path, and a check valve for preventing backflow to the drainage part side in the middle of the drainage path. 3. A partition wall which is provided with a water inlet and a water outlet and which leaks less than the amount of suction water of the negative pressure attracting portion of the venturi and which is partitioned and connected to the drain portion. The hot water supply device according to claim 2, further comprising a water passage portion having the following.