JP4044703B2 - Water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides two cans that can escape immediately after hot water is supplied without causing leakage of the expanded water generated by expansion of the hot water caused by heating or post-boiling in the piping of the combustion section. The present invention relates to a water channel type water heater.
[0002]
[Prior art]
As a conventional hot water supply device, an overpressure prevention valve is provided in the vicinity of a hot water supply port of a hot water supply pipe, and a structure having a configuration in which expansion water due to a post-boiling phenomenon in the hot water supply pipe immediately after use of the hot water supply is released to the outside of the pipe is known. ing.
However, in such a water heater,
a. If the location of the hot water supply system is within the pipe shaft, it will run down if there is no drainage.
b. If there is a drainage facility, it is necessary to take drainage means.
c. If inflated water leaks, the loss is large depending on the amount.
Therefore, various studies have been conducted to solve these problems. For example, in Japanese Utility Model Laid-Open No. 7-22355 (hereinafter referred to as “a”), “a water supply pipe that communicates with a water supply source and supplies water, and a heat exchange section that communicates with the water supply pipe and is heated by combustion means” And a hot water supply apparatus that supplies hot water that is heated to communicate with the heat exchange section to the hot water supply apparatus, the check block and the pressure relief valve are integrally incorporated in the valve block in the water supply pipe. A hot water supply apparatus having a check valve with a pressure relief valve attached is disclosed.
[0003]
[Problems to be solved by the invention]
However, the 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 advance and retract, it is difficult to maintain a watertight state, and boiled hot water may return to the water supply source side, sanitizing and sacrificing safety.
b. Conventionally, since a check valve has been installed on site after the hot water supply device has been installed, there is a possibility that another check valve may be mistakenly provided if a check valve is incorporated.
c. Since the check valve and the pressure relief valve are integrally incorporated in the valve block, the structure is complicated and lacks maintenance.
d. If either the check valve or the pressure relief valve fails, the entire valve block must be replaced, which is not economical.
[0004]
The present invention solves the above-mentioned conventional problems, and allows the expanded water generated by the expansion of hot water due to the post-boiling phenomenon to escape without causing leakage to the outside of the pipe. An object is to provide an excellent water heater.
[0005]
[Means for Solving the Problems]
In order to achieve this object, a hot water supply apparatus according to claim 1 of the present invention includes a combustion section, a circulation pipe for a bathtub that is heated by the combustion section and circulates hot water in the bathtub, and is heated by the combustion section and is one end. A hot water supply pipe whose side is connected to a water supply source via a check valve and the other end side is connected to a water tap or the like, and a predetermined portion of the circulation pipe for the bathtub and a hot water supply side of the hot water supply pipe are communicated A canned and two-water channel type hot water supply device comprising a hot water filling passage and an on-off valve disposed at a predetermined portion of the hot water filling passage, wherein the combustion of the downstream side of the on-off valve and the hot water supply piping A relief pipe that connects the water supply pipe on the water supply source side with respect to the water supply line, and is provided in a predetermined part of the relief pipe to constantly prevent the flow from the downstream side of the on-off valve to the hot water supply pipe side. When the pressure in the pipe exceeds a predetermined value, the valve is opened and the downstream of the on-off valve from the hot water supply pipe side. And it has a configuration including a overpressure prevention valve that allows flow to.
With this configuration, the following effects can be obtained.
a. The structure is simple and productive because it has only a relief pipe whose both ends communicate with the upstream and downstream sides of the on-off valve, and an overpressure prevention valve arranged at a predetermined part of the relief pipe. 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, the pressure propagates uniformly and is applied uniformly to the hot water supply piping. In addition, the pressure in the hot water supply pipe always rises due to thermal expansion even during reheating. At this time, if the pressure in the hot water supply pipe exceeds the set value, the overpressure prevention valve opens, and the expansion water is discharged as bathtub water through the escape pipe and the bathtub circulation pipe. Is no longer necessary, and the hot water supply device can be mass-produced at a low cost, and the number of installation man-hours can be greatly 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, so that the check valve is not double attached.
d. The hot water supply pipe and the water supply source are connected only by a check valve, so that the boiling water does not flow back to the water supply source and is excellent in safety.
e. In the hot water supply pipe, when the hot water supply faucet is closed instantly, high pressure is generated by water hammer (water hammer) and each part in the hot water supply pipe may be damaged and generate unpleasant vibration and noise. However, these can be prevented or alleviated.
f. Since the upstream end of the escape 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, so materials with poor heat resistance such as natural rubber can be used. It can be used, and the burden on the overpressure prevention valve can be reduced, so that the cost can be increased and the durability is excellent.
Here, the overpressure prevention valve may be any valve that has a configuration that allows the expansion water to escape to the downstream side of the on-off valve when the pressure in the pipe rises above a specified value, and a spring-type safety valve is preferably used. It is done.
[0006]
Invention of Claim 2 of this invention is a hot-water supply apparatus of Claim 1, Comprising: It has the structure by which the said overpressure prevention valve is removable independently.
With this configuration, in addition to the operation of the first aspect, the following operation is provided.
a. Since the overpressure prevention valve can be removed as a single unit, even if the overpressure prevention valve is damaged, only the overpressure prevention valve needs to be replaced, and the maintenance is excellent.
b. Since the overpressure prevention valve can be a common part with other models, it has excellent versatility.
c. Although the dezincing resistant material required as a material for the overpressure prevention valve is a high value, since the overpressure prevention valve is designed as a single unit, it can be miniaturized and is excellent in economic efficiency.
[0007]
Invention of Claim 3 of this invention is a hot-water supply apparatus of Claim 1 or 2, Comprising: A double check valve or two or more check valves are the said hot water filling path, the said relief pipe line, and It has the structure arrange | positioned by the said hot water filling path downstream from the downstream communication part.
With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
a. Since the double 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 filling path, and is excellent in hygiene.
[0008]
Invention of Claim 4 of this invention is a hot-water supply apparatus as described in any one of Claim 1 thru | or 3, Comprising: The diameter of the channel | path cross section of the downstream of the said overpressure prevention valve is 5 mm-0.1 mm , Preferably 1.5 mm to 0.5 mm.
With this configuration, in addition to the operation of any one of claims 1 to 3, the following operation is provided.
a. Even if the overpressure prevention valve is broken and water leaks, it is a narrow passage, so only a small amount of water leaks.
Here, by setting the diameter of the passage cross section on the downstream side of the overpressure prevention valve to 1.5 mm to 0.5 mm, the pressure is increased when the pressure in the hot water supply pipe exceeds a predetermined value due to a post-boiling phenomenon or the like. It can escape smoothly to the circulation piping side for bathtubs.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment)
A hot water supply apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view of a hot water supply apparatus according to an embodiment of the present invention.
In FIG. 1, 1 is a canned and two-channel hot water supply apparatus according to an embodiment of the present invention, 2 is a combustion section having a burner, a combustion fan, an ignition device, etc. A hot water supply pipe which is connected to a water supply source through a valve and the other end is connected to a hot water supply appliance, 3a is a water supply pipe which is a pipe on the water supply source side of the hot water supply pipe 3, and 3b is a pipe on the outlet side of the hot water supply pipe 3 4 is a bath return pipe through which hot water from a bath flows, and 4b is a combustion section 2. The hot water pipe 4 is heated by the combustion section 2 and is circulated by a circulation pump (not shown). A hot water supply pipe through which hot water heated by the air flows into the bath, 5 is a hot water supply path where both ends are connected to the hot water supply pipe 3b and the hot water supply pipe 4b, and 6 is a predetermined portion of the hot water supply line 5 Hot water solenoid valve, 7 is filled with water on one end side downstream of the pouring solenoid valve 6 5 is a relief pipe that communicates with the water supply pipe 3a at the other end, 8 is an overpressure prevention valve that is a spring-type safety valve that is detachably provided at a predetermined portion of the relief pipe 7, and 9 is filled with hot water. Although it is a double check valve that is disposed in the hot water filling passage 5 downstream from the downstream communication portion between the passage 5 and the escape pipe 7, the hot water of the bath is prevented from flowing back to the hot water supply pipe 3 side. However, it is not always necessary to use a double check valve, and two check valves may be provided. A check valve 10 is disposed after the hot water supply device 1 is installed, and prevents hot water in the hot water supply pipe 3 from flowing back to the water supply source.
Next, the internal structure of the overpressure prevention valve 8 will be described.
FIG. 2 is a side view of the main part of the overpressure prevention valve according to the embodiment of the present invention.
2, a spring-loaded safety valve serving overpressure prevention valve body 8, 20 hollow cylindrical valve body made of resistant dezincification resistant material, 21 formed on the inner wall of the hot water supply pipe 3 side of the valve casing 20 A valve seat 22 is a valve lid fitted in the opening of the valve box 20 on the side of the circulation pipe 4 for the bathtub and a fluid passage is secured in the center, and 23 is a spring press screwed in the valve box 20. It is a pressure adjusting screw. The pressure in the hot water supply pipe 3 when the valve is opened can be set to a predetermined value by turning the pressure adjusting screw 23 and expanding and contracting the spring. Reference numeral 24 denotes a valve body that is a spring receiver disposed in contact with the valve seat 21, reference numeral 25 denotes a soft rubber sheet such as natural rubber or NBR disposed at an end of the valve body 24 on the valve seat 21 side, and reference numerals 26 denote both ends. Is a spring supported by the end of the pressure adjustment screw 23 on the hot water supply piping 3 side and the end of the valve body 24 on the side of the circulation piping 4 for bathtub, and presses the valve body 24 in the valve closing direction to soften it. The seat 25 is brought into contact with the valve seat 21 in a watertight state.
The pressure at the time of valve opening adjusted by the pressure adjusting screw 23 is preferably 12.5 kg / cm ^{2 to} 17.5 kg / cm ² , more preferably around 15 kg / cm ² .
The operation of the hot water supply apparatus in the embodiment configured as described above will be described below.
When the hot water in the heating section of the hot water supply pipe 3 of the hot water heater 1 immediately after the hot water supply expands due to a so-called post-boiling phenomenon, the pressure propagates and is uniformly applied from the upstream side to the downstream side of the hot water supply pipe. At this time, when the pressure in the hot water supply pipe 3 becomes equal to or higher than a set value (15 kgf / cm ² in the present embodiment), the valve body 24 slides in the valve opening direction by pressing of the expansion water, and the valve body 24 A gap is formed between the soft seat 25 and the valve seat 21. The expansion water enters the overpressure prevention valve 8 through the clearance and flows into the bathtub circulation pipe 4 side. When hot water flows into the bathtub circulation pipe 4 side and the pressure in the hot water supply pipe 3 becomes smaller than the set value, the valve body 24 slides in the valve closing direction by the pressing of the spring 26, and the soft seat 25 and the valve seat 21 are moved. Since it contacts the watertight state, the flow of hot water into the circulation pipe 4 side for the bathtub stops. At this time, the amount of hot water flowing into the bathtub circulation pipe 4 side is very small and does not affect the bathtub circulation pipe 4 side.
[0010]
As described above, according to the hot water supply apparatus of the present embodiment, the following effects can be obtained.
a. One end is connected to a hot water filling passage 5 downstream of the pouring solenoid valve 6 and the other end is connected to a water supply pipe 3a. Therefore, the structure is simple and the productivity can be improved.
b. When hot water in the piping of the combustion section 2 immediately after hot water supply expands due to a so-called post-boiling phenomenon, the pressure propagates and is applied uniformly to the hot water supply piping 3. At this time, when the pressure in the hot water supply pipe 3 becomes a certain value or more, the overpressure prevention valve 8 is opened, and the expanded water is discharged as bathtub water through the escape pipe 7 and the bath outlet pipe 4b. The hot water supply apparatus 1 can be mass-produced at a low cost and the number of installation man-hours can be greatly reduced.
c. Since the check valve 10 and the overpressure prevention valve 8 are formed separately, and the check valve 10 is disposed on site after the hot water supply device 1 is installed, the check valve 10 may be mounted twice. Absent.
d. The hot water supply pipe 3 and the water supply source are communicated only by the check valve 10, and the boiling hot water does not flow back to the water supply source side, which is excellent in safety.
e. Since the upstream end of the escape pipe 7 is connected to the water supply pipe 3a, the temperature of the hot water flowing into the overpressure prevention valve 8 can be suppressed. A material with poor heat resistance may be used, and the burden on the overpressure prevention valve 8 can be reduced, so that the cost can be reduced and the durability is excellent.
f. Since the overpressure prevention valve 8 can be removed as a single unit, even if the overpressure prevention valve 8 is damaged, only the overpressure prevention valve 8 needs to be replaced, and the maintenance is excellent. Moreover, the diameter of the passage cross section on the downstream side of the overpressure prevention valve 8 is 1.5 mm or less, and since it is a narrow passage, only a small amount of water leaks.
g. Since the double check valve 9 is provided, the hot water of the bath outlet pipe 4 b does not flow into the water supply pipe 3 a through the escape pipe 7 and the hot water filling path 5, and is excellent in hygiene.
h. In the hot water supply pipe 3, when the hot water supply faucet is closed instantly, a high pressure is generated by a water hammer, and each part in the hot water supply pipe 3 is damaged, and at the same time, uncomfortable vibration and noise are generated. In some cases, these can be prevented or alleviated.
[0011]
【The invention's effect】
As described above, the hot water supply apparatus of the present invention has the following excellent effects.
According to the hot water supply apparatus of the first aspect, it has the following effects.
a. The structure is simple and productive because it has only a relief pipe whose both ends communicate with the upstream and downstream sides of the on-off valve, and an overpressure prevention valve arranged at a predetermined part of the relief pipe. It is possible to provide a hot water supply device that can be improved.
b. It is not necessary to provide drainage means, and it is possible to provide a hot water supply device that can mass-produce hot water supply devices at low cost and can significantly reduce the number of installation work steps.
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 in the field. It becomes possible to provide.
d. The hot water supply pipe and the water supply source are communicated only by the check valve, so that the boiling hot water does not flow back to the water supply source, and it is possible to provide a hot water supply device that is excellent in safety.
e. If the hot water faucet is closed in the hot water supply pipe instantaneously, a high pressure is generated by a water hammer, and each part in the hot water supply pipe may be damaged, and at the same time, uncomfortable vibration and noise may be generated. However, since these can be prevented or alleviated, the safety is excellent and the durability is excellent.
f. It is possible to reduce the burden on the overpressure prevention valve, to suppress the cost increase, and to provide a hot water supply device having excellent durability.
[0012]
According to the hot water supply device of the second aspect, in addition to the effect of the first aspect, the following effect is obtained.
a. Even if the overpressure prevention valve is damaged, it is only necessary to replace the overpressure prevention valve, and it is possible to provide a hot water supply device with excellent maintainability.
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 device with excellent versatility.
c. Although the dezincing-resistant material required as a material for the overpressure prevention valve is high, it is possible to provide a hot water supply device that can be downsized and can be economically designed because the overpressure prevention valve is designed as a single unit. Become.
[0013]
According to the hot-water supply apparatus of Claim 3, in addition to the effect of Claim 1 or 2, it has the following effects.
a. In the unlikely event that the check valve inserts solid matter (dust) into the opening and closing part and the valve remains open, the other check valve will allow the hot water in the bathtub circulation pipe to escape and fill with hot water. It is possible to provide a hot water supply apparatus that is prevented from flowing into the hot water supply pipe through the road and has excellent hygiene.
[0014]
According to the hot-water supply apparatus of Claim 4, in addition to the effect of any one of Claims 1 thru | or 3, it has the following effects.
a. Even if the overpressure prevention valve is broken and water leaks, it 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 view of a hot water supply apparatus according to an embodiment of the present invention. FIG. 2 is a side view of an essential part of an overpressure prevention valve according to an embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Hot-water supply apparatus 2 Combustion part 3 Hot-water supply piping 3a Hot-water supply piping 3b Hot-water supply piping 4 Bath circulation piping 4a Bath return piping 4b Bath-out piping 5 Hot-water passage 6 Pouring solenoid valve 7 Relief piping 8 Overpressure prevention valve 9 2 stations 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)

A combustion section, a circulation pipe for a bathtub that is heated in the combustion section and circulates hot water in the bathtub, and is heated in the combustion section and communicated with a water supply source at one end side through a check valve, and communicated with a water faucet or the like at the other end side. A hot water supply pipe, a hot water passage connected between a predetermined portion of the circulation pipe for the bathtub and a hot water supply side of the hot water supply pipe, and an on-off valve disposed in the predetermined portion of the hot water supply passage; One can two water channel hot water supply device equipped with
A relief pipe that connects a downstream side of the on-off valve and a water supply pipe closer to the water supply source than the combustion part of the hot water supply pipe, and a predetermined part of the relief pipe that is disposed from a downstream side of the on-off valve. The flow to the hot water supply pipe side is always blocked, and when the pressure in the hot water supply pipe exceeds a predetermined value, the valve is opened to allow the flow from the hot water supply pipe side to the downstream side of the on-off valve. A hot water supply device comprising a pressure prevention valve. The hot water supply apparatus according to claim 1, wherein the overpressure prevention valve is detachable as a single unit. 2. A double check valve or two or more check valves are disposed in the hot water filling path downstream from the downstream communication portion between the hot water filling path and the escape pipe line. The hot water supply apparatus according to 1 or 2. The diameter of the passage cross section on the downstream side of the overpressure prevention valve is 5 mm to 0.1 mm, preferably 1.5 mm to 0.5 mm. Hot water supply device.

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