JPS6317347A - Reflux preventive apparatus for hot water supplier with additional burning heater for bath - Google Patents

Abstract

PURPOSE:To prevent air mixing from a hopper and let air escape smoothly even if air is included by a method wherein a cylinder having small holes is placed at the lower part of a hopper and further a guide cylinder having a space at the periphery of said cylinder is installed. CONSTITUTION:The hot water heated in a heat exchanger 6 for hot water supply is guided to the inlet hole 23 of a solenoid valve 9 and then dropped down from a water filling hole 24 by opening a valve body 9. When the original pressure of city water is high, hot water mixed with air is accumulated in the bottom of a hopper 10. When this hot water mixed with air flows in an upper opening 25a, air separation is achieved and the hot water flows in an additional burning heat exchanger 5 for a bath and then is dropped into a bathtub 1 through a circulating pump 12. When the supply amount from the hole 24 is increased by the change in the original pressure of the city water, the hot water mixed with air flows in from a drain hole 25. At that time, as air accumulation is formed in a connecting pipe 22, the air is escaped through a hollow pipe 26 into the upper part of the hopper. Even through some air bubbles flow in, the air is escaped in the upper part of the hopper 10 by an air bleeding pipe 28 connected to the upper part of the exchanger 5.

Description

[Detailed Description of the Invention] Industrial Application The present invention relates to a backflow prevention device that is a device in a bath reheating water heater with a pot that allows hot water heated by the water heater to fall into the bathtub through the heat exchange circuit of the bath pot. It is.

Conventional technology In general, backflow prevention devices in hot water heaters with bath reheating pots provide space at the water inlet and drain to prevent sewage (bath water) from flowing back into the city water supply, allowing constant communication with the atmosphere. This is to perform the connection between the city water supply and bathtub water II). An example of the above-mentioned conventional backflow prevention device will be described below with reference to the drawings.

Figure 3 shows a side sectional view of a conventional backflow prevention device.
FIG. 4 is a system diagram of a water heater with a bath reheating pot incorporating this backflow prevention device. Reference numeral 4 denotes a water heater body with a bath reheating pot, which includes a hot water supply heat exchanger 6 and a bath reheating heat exchanger 5. Reference numeral 7 denotes a water supply inlet, which is branched off at the outlet of the hot water supply heat exchanger 6, and one end leads to the kitchen, workplace, etc., and is connected to an easy-to-outlet faucet 8. On the other side, solenoid valve 9, hopper 1
0 to the bath reheating heat exchanger 5.

Furthermore, the bathtub 1 and the bath reheating heat exchanger 5 are connected via a circulation pump 12 between the circulation return pipe 3 and the circulation outbound pipe 2. 13 is a diaphragm type water level sensor, which is connected to the bath reheating heat exchanger 5 via a pipe 14.

In FIG. 3, the outlet pipe 9 of the hot water heat exchanger 6 is a solenoid valve that opens and closes a valve body 9a. 10 is a hopper, which is opened to the atmosphere at the overflow port 111/'i. Reference numeral 21 denotes a cylindrical water splash prevention plate, 20 a funnel-shaped guide tube, and 22 a connecting pipe, which connects the hopper 10 and the bath reheating heat exchanger 5.

The operation of the backflow prevention device configured as described above will be described below.

First, the hot water poured into the bathtub 1 is heated by the hot water heat exchanger 6, guided to the hopper 10 by opening the valve body 9a of the solenoid valve 9, passed through the guide cylinder 20, and then from the connecting pipe 22.
Hot water is poured into the bathtub 1 through a bath reheating heat exchanger 5 and a circulation return pipe 3. The water level sensor 13 detects that the water level 15 in the bathtub 1 is higher than the circulation pump 12, the circulation pump 12 is operated, and the water in each tank 1 is sucked through the circulation return pipe 3 to perform bath reheating heat exchange. Together with the enema dropped from the hopper 10 via the vessel 5, a circulation circuit is formed which returns the enema to the bathtub 1 via the circulation pipe 2, and the enema is dropped into the bathtub 1. By setting the water level for pouring hot water into the bathtub 1, detecting it with the water level sensor 13 and stopping the circulation pump 12 and the solenoid valve 9,
You can pour the desired amount of water into the tank. There is no problem with this during normal operation, but if the connecting pipe 22 is clogged with scale, scale is attached to the inner wall of the connecting pipe 22, or the passage diameter becomes smaller than the original, the amount of molten metal poured into the hopper 10 may be changed. When the water cannot be completely discharged, it will be discharged from the overflow port 11.

At this time, the water level in the hopper 10 is lower than the valve body 9a in the solenoid valve 9.
If the diameter of the overflow port 11 is determined so that the pressure does not reach this level, even if the city water supply side becomes negative pressure, sewage (hot water in the bathtub) will not flow back to the city water supply side.

Problems to be Solved by the Invention However, in the above configuration, when the valve body 9a is opened and water falls into the guide tube 20, air is sucked from the overflow port 11 due to the eject action, and the connection pipe is removed from the hopper 10. A mixture of air and hot water is dropped into the bath reheating heat exchanger 5 through the bath 22. bathtub 1
1”t while the circulating pump 12 is not operating because the hot water level is low.
That's really good.

However, when the hot water level in the bathtub 1 becomes high and the circulation pump 12 starts operating, air accumulates in the circulation pump 12 and runs dry, damaging the mechanical seal of the circulation pump 12 and causing water leakage. In addition, air accumulates in the bath reheating heat exchanger 5, and the air passes through the connecting pipe 22 to the hopper 10.
Either through the overflow port 11 or through the circulation pipe 2 into the bathtub 1. At this time, pressure fluctuations occur within the bath reheating heat exchanger 5, causing a problem in that the water level sensor 13 malfunctions due to this pressure fluctuation.

In view of the above-mentioned problems, the present invention has a function to prevent the backflow of sewage by separating the hopper from the original city water supply side at atmospheric pressure. This prevents air from getting mixed in, and even if air gets into the bath reheating heat exchanger, it will smoothly escape and prevent air from getting into the circulation pump. The present invention also provides a backflow prevention device that prevents pressure fluctuations within the bath reheating heat exchanger.

Means for Solving the Problems In order to solve the above problems, the backflow prevention device of the present invention has a water inlet in the upper wall, an overflow port in the side wall, and a drain port extending inward from the bottom wall. A hollow pipe is installed with a gap inside the drain, and the upper end is opened above the upper end of the overflow port, and the lower end is opened at the upper part of the pipe that connects the drain to the bath reheating heat exchanger. , and the upper end of the air vent pipe extended inward from the lower wall is opened near the overflow port, the lower end is connected to the upper part of the bath reheating heat exchanger via a pipe to form a hopper, and the air is poured into the inside of this hopper. A cylindrical body having a small hole at the bottom is provided so as to face the water spout, and a space is provided around the outer periphery of the cylindrical body, and a guide cylinder is provided.

Function: With the above-described configuration, the present invention receives the hot water flowing out from the water inlet in the cylindrical body, and some of the hot water is discharged into the hopper through the small hole at the bottom. The kinetic energy of the falling water is extinguished and the water overflows from the top of the cylinder,
It is discharged into the hopper by natural water falling from the space between the guide tube and the guide tube. At this time, the ejecting action of water falling from the water inlet sucks air from the overflow port, and air-mixed water accumulates in the hopper. When this air-mixed water flows into the drain port protruding from the lower wall of the hopper, air separation is performed because the flow rate of the air-mixed water is slow and the surface open to the atmosphere is wide. thus,
The air-separated hot water passes through the connecting pipe from the drain, enters the bath reheating heat exchanger, and is dropped into the bathtub. Furthermore, if the flow rate from the water inlet increases due to changes in the water pressure of the city water supply, air separation in the hopper will not be complete, and hot water mixed with air will enter the bath reheating heat exchanger.

At this time, an air pocket forms in the connecting pipe between the hopper drain and the bath reheating heat exchanger. This air is released into the hopper through a hollow tube installed inside the drain port. Furthermore, even with this, the air that has flowed into the bath reheating heat exchanger,
By letting the air escape to the upper part of the hopper through the pipe connected to the upper part of the bath reheating heat exchanger, it is possible to prevent air from entering the circulation pump and reduce pressure fluctuations inside the bath reheating heat exchanger. This will improve the detection accuracy of the water level sensor.

EXAMPLE Hereinafter, a backflow prevention device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a side sectional view of a backflow prevention device in an embodiment of the present invention. FIG. 2 is a system diagram of a bath reheating kettle water heater incorporating this backflow prevention device. 1st
In the figure, 10 is a hopper, which has an overflow port 11 on the side wall and a water inlet 24 in the upper part.
A guide tube 21 is disposed with a space provided around the outer periphery of the tube. 9
9 is a solenoid valve that opens and closes the water inlet 24, 9a is a valve body of the solenoid valve, and 23 is an inlet of the solenoid valve. Reference numeral 25 denotes a cylindrical drain, which extends upward from the bottom of the hopper 10 and has an opening 25a; 22, a connecting pipe connected to the drain 25; is connected to. Reference numeral 26 denotes a hollow tube that penetrates inside the drain port 25, has an upper end opened above the upper end of the overflow port 11, and a lower end opened above the connecting pipe 22. Reference numeral 27 denotes an air vent pipe, which extends upward from the bottom of the hopper 10 and opens at the level of the overflow port 11 when viewed from inside the hopper 10.

28 is an air vent connection pipe connected to the air vent pipe 27, and communicates the air vent pipe 27 with the upper part of the bath reheating heat exchanger 5. Reference numeral 16 denotes an air solenoid valve which is mounted on the side wall of the hopper 10 with an open end above the overflow port 11. 29 is an air suction pipe that communicates from the air solenoid valve 16 to the purification unit 30.

In FIG. 2, 1 is a bathtub, which communicates with a bath reheating heat exchanger 5 through a circulation return pipe 3 from the side wall.
11 Attach the purification unit 30 to the wall, and remove this purification unit)
30Vc is provided in the nonu nozzle 31, has a space 36 in front of the nozzle 31, is equipped with a jet port 32, and connects an air suction pipe 29 to the rear space of the nozzle/l'31. on the other hand,
A passage 37 extends from the space 36 to above the bathtub 1 via a passage 37 and a fill 33, and a suction pipe 3 is connected to the upper end of the passage 37.
4 can be slid up and down freely. Reference numeral 4 denotes a water heater body with a bath reheating pot, which has a hot water supply heat exchanger 6 and a bath reheating heat exchanger 5 inside. 7 is a city water supply connection port, which is connected to the hot water heat exchanger 6;
One side is led to the kitchen, workplace, etc., and connected to the hot water tap 8. The other side is led to the hopper 10 via the solenoid valve 9 and connected to the reheating heat exchanger 5. 1
2 is a circulation pump whose suction side is connected to the reheating heat exchanger 5, and whose discharge side is connected to the nozzle/v31 of the purification unit 30 via the circulation pipe 2. A water level sensor 13 is connected to the reheating heat exchanger 5 via a pressure pipe 14.

The operation of the backflow prevention device configured as described above will be explained below with reference to FIGS. 1 and 2.

Water supplied from the city water supply connection lower is heated by a hot water heat exchanger 6, branched off midway, and used by hot water faucets 8 in kitchens, washrooms, etc. when necessary. On the other hand, the branched hot water is guided to the hopper 10 by opening and closing the electromagnetic valve 9, enters the reheating heat exchanger 5 through the connecting pipe 22, and is supplied to the bathtub 1 through the circulation return pipe 3. When hot water accumulates in the bathtub 1 and the water level rises, the hot water enters the pressure guide pipe 14 of the water level sensor 13, cuts off the atmospheric pressure, and increases the internal air pressure of the pressure guide pipe 14. It is detected that the preset pressure, ie, the water level in the bathtub 1 where the circulation pump 12 is filled with water, becomes higher than the preset pressure, and the circulation pump 12 is operated. By operating the circulation pump 12, the connecting pipe 2 is removed from the hopper 10.
2. Combine the hot water that is dropped through the bathtub 1 through the circulation return pipe 3 with the hot water that passes through the bath reheating heat exchanger 5, and pass it through the circulation return pipe 2. It is sent to the bathtub 1 through the jet port 32.

Further, when the water continues to be poured into the bathtub 1 and the water level in the bathtub 1 reaches the set water level by the water level sensor 13, the solenoid valve 9 is closed, the circulation pump 12 is stopped, and the water is poured into the bathtub 1. complete. When the hot water in the bathtub 1 is used for bathing and the water level drops, the solenoid valve 9 and the circulation pump 12 are restarted by detection by the water level sensor 13 to lower the water level to the original level and then stop. Although not shown, a thermistor is attached to the bath reheating heat exchanger 5 to detect the water temperature, and by operating the bath reheating burner (not shown) and the circulation pump 12, the temperature inside the bathtub 1 is increased. It is possible to keep the water temperature constant.

Furthermore, the circulation pump 1 is controlled by a switch on a separate controller.
2 and the air solenoid valve 16, the bathtub water is circulated from the bathtub 1 through the return pipe 3 and the bath reheating heat exchanger 5.
The circulation pump 12 sucks the air through the circulation pipe 2,
Water is discharged into the bathtub 1 from the nozzle 31 and spout 32 to circulate the bathwater. When this circulating flow enters the discharge outlet 32 from the nozzle 31, an attraction effect occurs in the space 36 due to the ejector action, and the air connecting pipe 29 and the air solenoid valve 1
The atmosphere in the hopper 10 is suctioned through the bathtub 1, and the circulating flow and air are ejected into the bathtub 1 from the spout 32 to eject air bubbles, allowing the bather to enjoy a bubble bath. Further, by operating only the circulation pump 12 using the separate controller, a circulating flow of bathtub water is created in the same manner as described above, and the bathtub water is drawn into the space 36 from the suction port 35 through the purification passage 37 and the filter 33. Make a start. Due to the flow in the purification passage 37, the internal pressure of the purification pipe 34 becomes lower than the water pressure in the bathtub 1, and the pressure difference between the inside and outside of the purification pipe 34 creates buoyancy, which floats up to near the bathtub water surface 15 and sucks in the upper layer water of the bathtub. By sucking in the upper layer water, hair, scale 15a, etc. floating on the water surface of the bathtub 1 are also sucked, filtered by the filter 33, and returned to the bathtub 1 through the spout 32.
It purifies the bath water.

The operation of the hopper 10 of the water heater 4 with a reheating pot having such a function will be explained using FIG. 1.

Hot water heated by the hot water heat exchanger 6 is guided to the inlet 23 of the electromagnetic valve 9, and is dropped from the water inlet 24 when the valve body 9a is opened. At this time, since the area around the water inlet 24 is open to the atmosphere through the overflow port 11, air suction occurs due to the ejector action due to the speed of water falling from the water inlet 24, and the water and air are mixed and fall into the cylinder 20. do. A part of the water is discharged from the small hole 20a, but most of it collects in the cylinder 20, where air and water are separated, overflows from the upper end of the cylinder 20, and falls naturally through the gap with the guide cylinder 21.

However, when the source pressure of the city water supply is high, the amount of water falling from the water inlet 24 increases, and the water cannot be covered by the above water supply, and hot water mixed with air accumulates at the bottom of the hopper 10. When this air-mixed hot water flows into the upper opening 25a of the drain port 25 that protrudes upward from the bottom of the hopper 10, the flow rate of the air-mixed hot water is slow and the open area to the atmosphere is wide, so that air separation is not possible. It is done. The air-separated hot water enters the bath reheating heat exchanger 5 through the connecting pipe 22 and passes through the circulation pump 12 to the bathtub 1.
be plunged into. In addition, due to changes in the city water source pressure, water inlet 24
If the amount of water dropped from the hot water tank increases, the air cannot be completely separated by the above action, and air-mixed hot water flows in from the drain port 25. At this time, since an air pocket is formed in the connecting pipe 22, the air in the connecting pipe 22 is released to the upper part of the hopper through the hollow pipe 26. Due to this action, the connecting pipe 2
This prevents air from rising inside the hopper 10 and attempting to escape from the drain port 25 into the hopper 10, and preventing hot water accumulated in the hopper 10 from naturally falling from the drain port 25.

Furthermore, even with this, some air bubbles will flow into the bath reheating heat exchanger 5, so some air bubbles will be released into the upper part of the hopper 10 through an air vent pipe 28 connected to the upper part of the bath reheating heat exchanger 5. It is.

As described above, according to this embodiment, since the cylinder 20 and the guide tube 21 are provided opposite to the water inlet 24, the water inlet 2
Primary air separation of the air-mixed hot water is performed by air suction by the ejector action when water falls from 4. A drain 25 extending upward from the bottom of the hopper 10 performs secondary air separation, and a hollow pipe 26 passing through the drain 25 allows air that has entered the connecting pipe 22 to escape, and further heat exchange for bath reheating. Connect the air vent pipe 28 connected to the top of the container 5 to the bottom 1M of the hopper 10.
- By connecting the air vent pipe 27 that extends upward, air bubbles that have flowed into the bath reheating heat exchanger 5 can be released. This eliminates the air suction of the circulation pump 12, and prevents water leakage caused by damage to the mechanical seal of the circulation pump 12. Furthermore, since no pressure fluctuation occurs in the bath reheating heat exchanger 5, the water level sensor 13 does not operate at all.

Effects of the Invention As described above, the present invention provides a hopper with a 67
7. A guide cylinder is provided in the hopper with a circumferential gap between the cylinder and its outer periphery, a drainage port is provided extending upward from the bottom of the hopper, and a hollow space passes through the drainage port with a gap inside. A pipe is provided, and an air bleed pipe is provided that extends upward from the bottom of the hopper into the hopper, and the drain port and the bath reheating heat exchanger are communicated with each other through a connecting pipe, and the air bleed pipe and the bath reheating heat exchanger are connected to each other by a connecting pipe. By connecting the upper part with an air vent pipe, it is possible to prevent air from getting into the bath reheating heat exchanger, and even if air does get mixed in, it can be easily released to the hopper, thereby preventing air from getting into the circulation pump. This prevents damage to the mechanical seal of the circulation pump and prevents water leakage accidents. In addition, since there is no air mixed into the bath reheating heat exchanger, there is no fluctuation in the internal pressure of the bath reheating heat exchanger, so for example, a water level sensor that outputs the internal pressure of an Off box will have higher detection accuracy, and the water level will match the set water level. You can drop it into the bathtub. Furthermore, the water inlet to the hopper is always open to the atmosphere through the overflow port, so the backflow prevention device's original
Even if the city water supply side becomes negative pressure due to water outage, etc., backflow of bath water will not occur.

[Brief Description of the Drawings] Fig. 1 is a side sectional view of a backflow prevention device according to a first embodiment of the present invention, and Fig. 2 is a side sectional view of a water heater with a bath reheating pot incorporating the backflow prevention device of the present invention. FIG. 3 is a side sectional view of a conventional backflow prevention device, and FIG. 4 is a system configuration diagram of a water heater with a bath reheating pot incorporating the conventional backflow prevention device. 5...Bath reheating heat exchanger, 10...
Hopper, 11... Overflow port, 20...
Cylindrical body (cylindrical), 21... Guide tube, 22...
...Connection pipe, 24...Water inlet, 25...
...Drain port, 26...Hollow pipe, 27...Air vent pipe, 28...Air vent pipe.

Claims (1)

[Claims] A hopper with a water inlet on the top wall, an overflow port on the side wall, and a drain port that projects upward from the bottom wall, with a gap inside the drain port of this hopper, and the upper end is the upper end of the overflow port. The upper part of the hopper is opened into the hopper, and the lower end is a hollow pipe that is opened above the connection pipe that connects the drain to the bath reheating heat exchanger, and the upper end is extended to protrude upward from the bottom wall of the hopper. An air vent pipe opened near the overflow port, an air vent pipe connected to this air vent pipe and communicating with the upper part of the bath reheating heat exchanger, and an air vent pipe provided inside the hopper facing the water inlet, with a small hole at the bottom. A backflow prevention device for a water heater with a pot for reheating a bath, comprising a cylindrical body and a guide tube disposed with a space provided around the outer periphery of the cylindrical body.