JP2000337700A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of releasing expanded water generated by expansion of hot water due to a post-boiling phenomenon in a hot water supply pipe by a combustion section without causing leakage to the outside of the pipe, However, an object of the present invention is to provide a simple and cost-effective water heater. SOLUTION: In order to solve this problem, the present invention includes a hot water path 5 communicated with a hot water supply side and a bathtub side, and an opening / closing valve 6 disposed at a predetermined portion of the hot water path 5. A one-can, two-channel hot water supply apparatus, comprising: a downstream side of an on-off valve 6 and a hot water supply pipe 3
A relief pipe 7 connecting the combustion section 2 to the water supply source side, and a flow pipe provided at a predetermined portion of the relief pipe 7 from the downstream side of the on-off valve 6 to the hot water supply pipe 3 side to constantly block the flow. An overpressure prevention valve 8 that opens when the pressure in the pipe 3 exceeds a predetermined value to allow a flow from the hot water supply pipe 3 to a downstream side of the on-off valve 6.
And a configuration having:

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the present invention, in which, immediately after hot water is supplied, expanded water generated by expansion of hot water due to heating of a combustion section inside a pipe or post-boiling does not leak outside the pipe. The present invention relates to a one-can-two-channel hot water supply device that can be missed.

[0002]

2. Description of the Related Art A conventional hot water supply apparatus has a configuration in which an overpressure prevention valve is disposed near a hot water supply port of a hot water supply pipe, and expansion water caused by a post-boiling phenomenon in the hot water supply pipe immediately after hot water supply is used is released outside the pipe. Are known. However, in such a water heater, a. If the installation location of the hot water supply device is inside the pipe shaft, it will run down if there is no drainage system. b. If there is a drainage system, it is necessary to take drainage measures. c. If the expansion water leaks, the loss is large depending on the amount. Due to the above problems, various studies have been made to solve these problems. For example, Japanese Utility Model 7-22
No. 355 (hereinafter referred to as “A”) discloses “a water supply pipe that communicates with a water supply source to supply water, a heat exchange section that communicates with the water supply pipe and is heated by combustion means, and a heat exchange section. A hot water supply device comprising: a hot water supply pipe for supplying heated hot water to a hot water supply apparatus; wherein a check valve and a pressure relief valve are integrated into a valve block in the water supply pipe, and a check with a pressure relief valve is incorporated in the valve block. A hot water supply device equipped with a valve "is disclosed.

[0003]

However, the above-mentioned conventional hot water supply apparatus has the following problems. a. Since the valve body of the pressure relief valve is disposed so as to be able to move forward and backward, it is difficult to maintain a watertight state, and the boiled hot water returns to the water supply source side, impairs hygiene and may lack safety. b. Conventionally, a check valve is installed on site after the hot water supply device is installed. Therefore, when the check valve is built in, there is a possibility that another check valve is erroneously installed. c. Since the check valve and the pressure relief valve are integrated into the valve block, the structure is complicated and the maintenance is poor. d. If one of the check valve and the pressure relief valve fails, the entire valve block must be replaced, which is not economical.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and allows expanded water generated by expansion of hot water due to a post-boiling phenomenon to escape without causing leakage to the outside of the piping, thereby improving maintainability, productivity, and the like. An object of the present invention is to provide a hot water supply device having excellent safety.

[0005]

In order to achieve this object, a water heater according to claim 1 of the present invention comprises a combustion section,
A bathtub circulation pipe that is heated in the combustion section and circulates hot water in the bathtub, and a hot water supply pipe that is heated in the combustion section and has one end connected to a water supply source via a check valve and the other end connected to a water tap or the like. A water filling path communicated between a predetermined portion of the bathtub circulation pipe and a tapping side of the hot water supply pipe, and an open / close valve disposed at a predetermined portion of the water filling path. A can-two-channel hot water supply apparatus, wherein a relief pipe connecting a downstream side of the on-off valve and a water supply source side from the combustion part of the hot water supply pipe is provided at a predetermined portion of the relief pipe. The flow from the downstream side of the opening / closing valve to the side of the hot water supply pipe is always blocked, and the valve is opened when the pressure in the hot water supply pipe becomes a predetermined value or more, and the valve is opened downstream of the opening / closing valve from the side of the hot water supply pipe. And an overpressure prevention valve that permits flow to the side. With this configuration, the following operation is obtained. a. A relief pipe having both ends communicating with the upstream side and the downstream side of the on-off valve, and an overpressure prevention valve disposed at a predetermined portion of the relief pipe;
, The structure is simple and productivity can be improved. b. When hot water in the piping of the combustion section immediately after hot water supply expands due to a so-called post-boiling phenomenon, pressure propagates and is uniformly applied to the hot water supply pipe. In addition, even during reheating, the pressure in the hot water supply pipe always rises due to thermal expansion. At this time, if the pressure in the hot water supply pipe exceeds the set value, the overpressure prevention valve opens, and the expanded water is discharged as bathtub water through the relief pipe and bathtub circulation pipe. Becomes unnecessary,
The water heater can be mass-produced at low cost, and the number of installation steps can be significantly reduced. c. The check valve and the overpressure prevention valve are formed separately, and the check valve is disposed on site after the hot water supply device is installed. Therefore, the check valve is not mounted twice. d. The hot water supply pipe and the water supply source are communicated only with the check valve, so that the hot water does not flow back to the water supply source, which is excellent in safety. e. If the tap for hot water supply is closed instantly in the hot water supply pipe, a high pressure will be generated due to water hammer,
Unpleasant vibration and noise may be generated at the same time as each part in the hot water supply pipe is damaged, but these can be prevented or mitigated. f. Since the upstream end of the relief pipe is connected to the water supply side of the hot water supply pipe, the temperature of the hot water flowing into the overpressure prevention valve can be suppressed. It may be used, and the load on the overpressure prevention valve can be reduced, the cost can be reduced and the durability is excellent. Here, as the overpressure prevention valve, any valve having a configuration in which the expansion water is released to the downstream side of the on-off valve when the pressure in the pipe rises above a specified value may be used, and a spring-type safety valve is preferably used. Can be

According to a second aspect of the present invention, there is provided the hot water supply apparatus according to the first aspect, wherein the overpressure prevention valve is configured to be detachable by itself. This configuration has the following operation in addition to the operation of the first aspect. a. Since the overpressure prevention valve can be removed by itself, even if the overpressure prevention valve is damaged, only the overpressure prevention valve needs to be replaced, which is excellent in maintenance. b. Since the overpressure prevention valve can be used as a common part with other models, it is excellent in versatility. c. Dezincing-resistant materials required as materials for overpressure prevention valves are high in value, but since the overpressure prevention valve is designed as a single unit, it can be miniaturized and is economical.

According to a third aspect of the present invention, there is provided a hot water supply apparatus according to the first or second aspect, wherein the two-way check valve or the two-way check valve is provided.
The above-described check valve has a configuration in which the check valve is disposed on the filling line downstream from the downstream communication portion between the filling line and the relief pipe. With this configuration, the following operation is obtained in addition to the operation of the first or second aspect. a. Since the two-way check valve is provided, the hot water of the bathtub circulation pipe does not flow into the hot water supply pipe through the escape pipe and the hot water pipe, which is excellent in hygiene.

According to a fourth aspect of the present invention, there is provided the hot water supply apparatus according to any one of the first to third aspects, wherein a diameter of a cross section of a passage downstream of the overpressure prevention valve is 5 mm to 5 mm. 0.1
mm, preferably 1.5 mm to 0.5 mm. With this configuration, the following operation is provided in addition to the operation described in any one of the first to third aspects. a. Even if the overpressure prevention valve is broken and water leaks, only a small amount of water leaks due to the narrow passage. Here, by setting the diameter of the cross section of the passage on the downstream side of the overpressure prevention valve to 1.5 mm to 0.5 mm, when the pressure in the hot water supply pipe becomes a predetermined value or more due to a post-boiling phenomenon or the like, the pressure is increased. It can smoothly escape to the bathtub circulation pipe side.

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment) One embodiment of the present invention
The hot water supply device in the form is described below with reference to the drawings.
I will tell. FIG. 1 shows a hot water supply apparatus according to an embodiment of the present invention.
FIG. In FIG. 1, reference numeral 1 denotes one embodiment of the present invention.
One-tank two-channel water heater in the form, 2 is a burner,
Combustion unit having a firing fan, an ignition device, etc.
Heated one end is connected to the water supply source via a check valve and the other end
Hot water supply pipe whose side communicates with the hot water supply equipment, 3a is a hot water supply pipe
A water supply pipe, which is a pipe on the water supply source side of the pipe 3, and 3b are hot water supply pipes.
The tapping pipe 4, which is a pipe on the tapping side of the pipe 3, is added to the combustion section 2.
Circulating hot and cold water in the bathtub by a circulation pump (not shown)
The tubing circulation pipe to make the bath water flow from the bath 4a
4b is hot water heated by the combustion unit 2.
Bath outgoing pipe for water to enter the bath, 5 for both ends
The hot water path connected to the bath 3b and the pipe 4b, 6
A pouring solenoid valve provided at a predetermined portion of the hot water path 5, one end of which is provided.
The other side is connected to the filling path 5 downstream of the pouring solenoid valve 6 and the other end
Side is a relief pipe connected to the water supply pipe 3a, 8 is a relief pipe
A spring-type safety device that is detachably provided in a predetermined part of 7
The overpressure prevention valve, which is all the valves, is connected between the filling line 5 and the relief line 7.
A bath located on the hot water path 5 downstream from the downstream communication section
Double reverse to prevent hot water from flowing back to hot water supply pipe 3
Although it is a stop valve, it does not necessarily need to be a double check valve,
Two check valves may be provided. 10 is equipped with a hot water supply device 1
Hot water in the hot water supply pipe 3 flows back to the water supply source
This is a check valve that prevents the check valve from being operated. Next, the overpressure prevention valve 8
The internal structure will be described. FIG. 2 shows an embodiment of the present invention.
It is a principal part side view of the overpressure prevention valve in a state. Figure 2
8 is an overpressure prevention valve body which is a spring type safety valve, and 20 isEnduranceProlapse
Hollow cylindrical valve box made of zinc material, 21 is valve box 2
0 is a valve seat formed on the inner wall of the hot water supply pipe 3 side, and 22 is a valve
The center of the box 20 is fitted to the opening on the side of the bathtub circulation pipe 4
The valve lid 23 having a fluid passage secured in the valve box 20
This is a pressure adjusting screw that holds a spring and is screwed into the section. Pressure
Turn the force adjusting screw 23 to expand and contract the spring.
To set the pressure in the hot water supply pipe 3 at the time of valve opening to a predetermined value.
It is possible. 24 is disposed in contact with the valve seat 21
The valve body 25 which is a spring receiver is provided on the valve seat 21 side of the valve body 24.
Soft sheets such as natural rubber and NBR arranged at the end,
Reference numeral 26 denotes an end of the pressure adjusting screw 23 on the side of the hot water supply pipe 3 at both ends.
And the end of the valve body 24 on the side of the bathtub circulation pipe 4.
It is a spring, and by pressing the valve body 24 in the valve closing direction
The soft seat 25 is abutted against the valve seat 21 in a watertight state.
You. In addition, when the valve is adjusted by the pressure adjusting screw 23 when the valve is opened.
The pressure is 12.5kg / cm ^Two~ 17.5kg / cm^Two,
More preferably 15 kg / cm^TwoPreferably around
is there. In the embodiment configured as described above,
The operation of the hot water device will be described below. Right after hot water
The hot water in the heating section of the hot water supply pipe 3 of the water heater 1
When expanded due to the hot water phenomenon, the pressure propagates and the hot water supply piping
It applies uniformly from upstream to downstream. At this time, hot water
The pressure in the pipe 3 is set to a set value (15 kg in the present embodiment).
f / cm^Two), The valve element 24 pushes the expansion water.
The soft seat 2 of the valve body 24 slides in the valve opening direction by pressure.
A gap is formed between the valve seat 5 and the valve seat 21. Swelling through that gap
The overfilling water enters the overpressure prevention valve 8 and the circulation pipe 4 for the bathtub.
To the side. Hot water flows into the bathtub circulation pipe 4 side
When the pressure in the hot water pipe 3 becomes smaller than the set value, the valve body 2
4 slides in the valve closing direction by the pressure of the spring 26,
Since the seat 25 and the valve seat 21 contact in a watertight state,
Flow into the bathtub circulation pipe 4 is stopped. At this time, bathtub
Amount of hot and cold water flowing into the circulation pipe 4 side
There is no effect on the circulation pipe 4 side.

As described above, according to the hot water supply apparatus of the present embodiment, the following operations can be obtained. a. A relief conduit 7 having one end communicating with the filling channel 5 downstream of the pouring solenoid valve 6 and the other end communicating with the water supply pipe 3a;
Since only the spring pressure relief valve 8, which is a spring-type safety valve, which is detachably disposed at a predetermined portion of the relief pipe 7, is simply provided, the structure is simple and the productivity can be improved. b. When the hot and cold water in the pipe of the combustion part 2 expands due to the so-called post-boiling phenomenon immediately after hot water supply, the pressure propagates and is uniformly applied to the hot water supply pipe 3. At this time, when the pressure in the hot water supply pipe 3 becomes equal to or higher than a predetermined value, the overpressure prevention valve 8 is opened, and the expanded water is discharged as bathtub water through the relief pipe 7 and the bath pipe 4b. Is unnecessary, the mass production of the hot water supply apparatus 1 can be performed at low cost, and the number of installation steps can be significantly reduced. c. The check valve 10 and the overpressure prevention valve 8 are formed separately, and the check valve 10 is installed on site after the hot water supply device 1 is installed. Absent. d. The hot water supply pipe 3 and the water supply source are communicated only by the check valve 10, so that the heated hot water does not flow back to the water supply source side, and the safety is excellent. e. Since the upstream end of the relief pipe 7 is communicated with the water supply pipe 3a, the temperature of hot water flowing into the overpressure prevention valve 8 can be suppressed. A material having poor heat resistance may be used, the load on the overpressure prevention valve 8 can be reduced, cost can be reduced, and durability is excellent. f. Since the overpressure prevention valve 8 can be detached by itself, even if the overpressure prevention valve 8 is damaged, only the overpressure prevention valve 8 needs to be replaced, which is excellent in maintenance. Further, the diameter of the cross section of the passage on the downstream side of the overpressure prevention valve 8 is 1.5 mm or less, and since the passage is a narrow passage, only a small amount of water leaks. g. Since the two-way check valve 9 is provided, the hot and cold water of the bath pipe 4b does not flow into the water supply pipe 3a through the escape pipe 7 and the hot water path 5, so that excellent sanitation is achieved. h. When the faucet for hot water supply is instantly closed in the hot water supply pipe 3, a high pressure is generated due to a water hammer (water hammer), which damages each part in the hot water supply pipe 3 and generates unpleasant vibration and noise. However, these can be prevented or mitigated.

[0011]

As described above, the hot water supply apparatus of the present invention has the following excellent effects. According to the hot water supply device of the first aspect, the following effects are obtained. a. A relief pipe having both ends communicating with the upstream side and the downstream side of the on-off valve, and an overpressure prevention valve disposed at a predetermined portion of the relief pipe;
, It is possible to provide a hot water supply apparatus having a simple structure and capable of improving productivity. b. It is not necessary to provide a drainage means, and it is possible to provide a hot water supply device that can mass-produce the hot water supply device at low cost and can significantly reduce the number of installation work. c. The check valve and the overpressure prevention valve are formed separately, and the check valve is installed after installing the hot water supply device on site, so a hot water supply device that does not have a double check valve is installed. Can be provided. d. Since the hot water supply pipe and the water supply source are communicated only with the check valve, the hot water can be provided with excellent safety without boiling water flowing back to the water supply source. e. If the tap for hot water supply is closed instantly in the hot water supply pipe, a high pressure will be generated due to water hammer,
Unpleasant vibrations and noises may be generated at the same time as each part in the hot water supply pipe is damaged, but these can be prevented or mitigated, so that the safety and the durability are excellent. f. The burden on the overpressure prevention valve can be reduced, the cost can be suppressed, and a hot water supply device having excellent durability can be provided.

According to the hot water supply apparatus of the second aspect, the following effects are obtained in addition to the effects of the first aspect. a. Even if the overpressure prevention valve is damaged, only the overpressure prevention valve needs to be replaced, and a hot water supply device excellent in maintainability can be provided. b. Since the overpressure prevention valve can be used as a common part with other models, it is possible to provide a hot water supply apparatus excellent in versatility. c. Dezincing-resistant materials required as materials for overpressure check valves are high in value, but it is possible to provide a hot water supply device that can be downsized and economically excellent because the overpressure check valve is designed as a single unit. Become.

According to the third aspect of the present invention, the following effects are obtained in addition to the effects of the first or second aspect. a. Even if the check valve traps solid matter (dust) in the open / close section and the valve remains open,
Hot water in the bathtub circulation pipe is prevented from flowing into the hot water supply pipe through the escape pipe and the hot water path, and a hot water supply apparatus excellent in hygiene can be provided.

According to the hot water supply apparatus of the fourth aspect, in addition to the effects of any one of the first to third aspects, the following effects are obtained. a. Even if the overpressure prevention valve is damaged and water leaks, the water passage is a narrow passage, so that only a small amount of water leaks, and it is possible to provide a hot water supply device that is excellent in hygiene and economical.

[0015]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a water heater according to an embodiment of the present invention.

FIG. 2 is a side view of a main part of an overpressure prevention valve according to one embodiment of the present invention.

[Description of Signs] 1 Hot-water supply device 2 Combustion unit 3 Hot-water supply pipe 3a Water-supply pipe 3b Hot-water supply pipe 4 Bath-tub circulation pipe 4a Bath return pipe 4b Bath-out pipe 5 Hot-water filling path 6 Injection solenoid valve 7 Evacuation pipe line 8 Overpressure Check valve 9 double check valve 10 check valve 20 valve box 21 valve seat 22 valve lid 23 pressure adjusting screw 24 valve body 25 soft seat 26 spring

Claims (4)

[Claims] 1. A combustion section, a bathtub circulation pipe which is heated in the combustion section and circulates hot water in a bathtub, and which is heated in the combustion section and has one end connected to a water supply source via a check valve and the other end supplied with water. A hot water supply pipe communicated with a plug or the like, a hot water path communicated between a predetermined portion of the bathtub circulation pipe and a tapping side of the hot water supply pipe, and a predetermined portion of the hot water path. A two-channel hot water supply device comprising: a relief pipe connecting a downstream side of the on-off valve and a water supply source side from the combustion portion of the hot water supply pipe; and The hot water supply is disposed at a predetermined portion of the pipeline and always blocks the flow from the downstream side of the on-off valve to the hot water supply pipe side, and opens when the pressure in the hot water supply pipe becomes a predetermined value or more. An overpressure prevention valve that permits flow from the piping side to the downstream side of the on-off valve. Hot water equipment. 2. The hot water supply device according to claim 1, wherein the overpressure prevention valve is detachable by itself. 3. A two-way check valve or two or more check valves being disposed on the filling line downstream from a downstream communication portion between the filling line and the relief pipe. The hot water supply device according to claim 1 or 2, wherein 4. The cross section of the passage downstream of the overpressure prevention valve has a diameter of 5 mm to 0.1 mm, preferably 1.5 mm to 0.5 mm.
The hot water supply apparatus according to any one of claims 1 to 3, wherein the length is in mm.