JP2003307342A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform the maintenance by easily demounting a filter and a check valve of a water heater. <P>SOLUTION: A connection pipe 32 is opened at its three-ways, one of the openings, 32c is closed by a drain plug 35 mountable and demountable from the outside of a case 36, and the filter 38 for preventing the intrusion of foreign matters, and the check valve 39 for preventing the reverse flow of the water are demountably held. The filter 38 and the check valve 39 can be removed by demounting the drain plug 35, which simplifies the maintenance work. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater having a filter and a check valve.

[0002]

2. Description of the Related Art As a conventional hot water supply device, a structure as shown in FIG. 6 is known. To explain the specific configuration, in the figure, reference numeral 1 is a water supply water pipe, and this water supply water pipe 1 is connected to a water supply means 3 constituted by an electromagnetic valve, a proportional on-off valve, etc. in the main unit 2. 4 is water supply means 3
Is a filter that prevents foreign substances from flowing in from the water supply water pipe 1 installed in front of the water supply pipe 3, and the water guide pipe 5 is provided at the other end of the water supply means 3.
Is connected to supply water to the water storage container 6. A check valve 7 that prevents water from flowing back from the water storage container 6 side to the water supply water pipe 1 side is provided in the middle of the water conduit 5. A heating means 8 composed of an electric heater is installed on the bottom surface of the water storage container 6 to heat the water in the water storage container 6.
Reference numeral 9 denotes a hot water discharge means composed of an electric pump, one end of which is connected to the water storage container 6 and the other end of which is connected to the hot water discharge path 10. 11 is a kitchen unit.

[0003]

However, since the filter 4 and the check valve 7 are provided in the main body unit 2 in the above-mentioned conventional structure, when the filter 4 is clogged or the check valve 7 is cleaned. When trying to do so, the main unit 2 had to be disassembled, which made maintenance very difficult.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a hot water supply apparatus in which a filter and a check valve can be easily removed to facilitate maintenance.

[0005]

In order to achieve the above-mentioned object, the hot water supply apparatus of the present invention has three openings of a connecting pipe, and one of the openings is closed by a drainage plug removable from the outside of the case to supply water. The filter that prevents the inflow of foreign matter from the water pipe and the check valve that prevents the reverse flow of water from the water storage container side are detachably held by the water drain plug, and by removing the water drain plug, reverse the filter. The stop valve is removable.

With this, the filter and the check valve can be removed together by removing the water drain plug, and the maintenance can be easily performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a water guiding path for guiding water to a water storage container, and a connecting pipe for opening the three directions and connecting two of the openings between the water guiding path and the water supply water pipe. A case for accommodating the connection pipe, a drain plug which is removable from the outside of the case and closes the remaining one opening of the connection pipe, and a filter for preventing foreign matter from flowing in from the water pipe for water supply, A check valve for preventing backflow of water from the water storage container side, the filter and the check valve are detachably held in the connection pipe by a water drain plug, and the water drain plug is removed. By using the hot water supply device in which the filter and the check valve can be removed, the filter and the check valve can be removed together by removing the water drain plug, and the maintenance can be easily performed.

The invention according to claim 2 provides the hot water supply device according to claim 1 in which the check valve is retained by the connection pipe when the water drain plug is incorporated into the connection pipe.
It is possible to prevent the filter and the check valve from falling off the drain plug due to the water flow, and to always remove the filter and the check valve together when the drain plug is removed.

According to a third aspect of the present invention, the opening portion of the connection pipe on the water draining plug side is arranged in the case.
By using the hot water supply device described in (1), it is possible to allow the water remaining in the connection pipe when the water drain plug is removed to drip into the case so that it does not get wet to the outside of the case.

According to a fourth aspect of the present invention, a hot water supply device according to any one of the first to third aspects is provided in which a water stopcock is attached to the connection pipe, and the water stoppage stopper is arranged so as to be operable from the outside of the case. By doing so, it is possible to stop the water only by the hot water supply device without closing the main tap of the water supply when the water drain plug is removed to perform maintenance, and the maintenance is easy.

[0011]

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

(Embodiment 1) FIGS. 1 to 3 show a hot water supply apparatus according to Embodiment 1 of the present invention.

In the figure, 31 is a water supply water pipe, and this water supply water pipe 31 is connected to a first opening 32a of a connection pipe 32 which is open on three sides. The second opening 32b of the connection pipe 32 is connected to the water supply means 34 formed of an electromagnetic valve, a proportional on-off valve, or the like in the main unit 33.

The third opening 32c of the connecting pipe 32 is also provided.
Is closed by a removable water drain plug 35, and the water drain plug 35 is projected so as to be removable from a hole 37 provided in a case 36 forming the outer shell of the unit. Reference numeral 38 is a filter that is provided in front of the water supply means 34 and prevents foreign substances from flowing in from the water supply water pipe 31. Between the water supply means 34 and the filter 38, the water supply water pipe 34 is provided from the water supply means 34 side.
A check valve 39 is provided on the first side to prevent water from flowing backward. The filter 38 and the check valve 39 are used as the water drain plug 3
5 is inserted into the water drain plug 36 through the opening 35a and is lightly press-fitted and held. A water conduit 40 is connected to the other end of the water supply means 34 to supply water to a water storage container 41. A heating means 42 composed of an electric heater is installed on the bottom surface of the water storage container 41 to heat the water in the water storage container 41. Reference numeral 43 denotes a hot water discharge means composed of an electric pump, one end of which is connected to the water storage container 41 and the other end of which is connected to the hot water discharge path 44. 45 is a kitchen unit, which is a water storage container 4
The water in 1 can be supplied to the sink via the hot water outlet path 44. Also, tap water can be supplied directly to the sink.

Next, the maintenance of the hot water supply device will be described. While the water heater is being used, foreign matter from the water supply water pipe 31 accumulates and the filter 38 becomes clogged, and the seal portion of the check valve 39 becomes too large to be replaced. When removing the filter 38 and the check valve 39 for maintenance, the drain plug 35 can be removed, and the filter 38 and the check valve 39 are held by the drain plug 35, so that they can be removed together.
Then, the filter 38 and the check valve 3 which are lightly press-fitted and held.
If 9 is pulled out from the drain plug 35, cleaning or replacement can be performed. In this way, maintenance can be easily performed without disassembling the main body unit 33.

(Embodiment 2) The hot water supply apparatus according to Embodiment 2 of the present invention is basically the same as that of Embodiment 1, and the dimensions of the connection pipe 32 and the check valve 39 in FIGS. Is set so that the check valve 39 is not pressed against the water supply means 34 side while the water drain plug 35 is incorporated in the connection pipe 32, and the check valve 39 does not come off. Therefore, even if the filter 33 and the check valve 39 are pushed out by the water flow of the water supply water pipe 31, the filter 33 and the check valve 39 do not fall off from the drain plug 35, and when the drain plug 35 is removed, the filter 33 and the check valve 39 are always put together. Can be removed.

(Embodiment 3) FIG. 4 shows a hot water supply apparatus according to Embodiment 3 of the present invention.

Differences from the first embodiment will be described with reference to the drawings. In this embodiment, the drainage plug 3 of the connection pipe 32
The fifth-side opening, that is, the third opening 32c is housed in the case 36 without protruding outside the case 36. When the drain plug 35 is removed, water remains in the connection pipe 32, but since the third opening 32c is contained in the case 36, the remaining water drops into the case 36 and is used for maintenance. It is possible to prevent water from leaking to the outside of the case 36.

(Embodiment 4) FIG. 5 shows a hot water supply apparatus according to Embodiment 4 of the present invention.

Differences from the first embodiment will be described with reference to the drawings. In this embodiment, a water stopper 42 is attached to the first opening 32a of the connection pipe 32 and is exposed to the outside of the case 36. The water can be stopped only by the hot water supply device by operating the water shut-off valve 42 without closing it, which facilitates maintenance.

[0021]

As described above, according to the hot water supply apparatus of the present invention, foreign matter from the water pipe for water supply is provided by opening the connection pipe on three sides and closing one of the openings with the water drain plug which is removable from the outside of the case. The filter that prevents the inflow of water and the check valve that prevents the reverse flow of water from the reservoir side are detachably held by the drain plug, and the filter and the check valve can be removed by removing the drain plug. By removing the drain plug, the filter and the check valve can be removed together for easy maintenance.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a hot water supply device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the main parts of the water heater.

FIG. 3 is an exploded cross-sectional view of main parts of the water heater.

FIG. 4 is a cross-sectional view of essential parts of a hot water supply device according to Embodiment 3 of the present invention.

FIG. 5 is a sectional view showing a schematic configuration of a hot water supply device according to Embodiment 4 of the present invention.

FIG. 6 is a cross-sectional view showing a schematic configuration of a hot water supply device in a conventional example.

[Explanation of symbols]

31 Water supply water pipe 32 connection pipe 32a First opening of connecting pipe 32b second opening of connecting pipe 32c Third opening of connecting pipe 35 Water drain plug 36 cases 38 filters 39 Check valve 40 water conduit 41 water reservoir 42 Stopcock

Claims (4)

[Claims] 1. A water guiding path for guiding water to a water storage container, a connecting pipe that opens on three sides and connects between the water guiding path and a water supply water pipe by two openings, a case for accommodating the connecting pipe, A drain plug that is removable from the outside of the case and closes the remaining one opening of the connection pipe, a filter that prevents the inflow of foreign substances from the water supply water pipe, and prevents the reverse flow of water from the water reservoir side. Hot water supply in which the filter and the check valve are detachably held in the connection pipe with a water drain plug, and the filter and the check valve can be removed by removing the water drain plug. apparatus. 2. The hot water supply apparatus according to claim 1, wherein the check valve is retained and retained by the connection pipe when the water drain plug is incorporated in the connection pipe. 3. The hot water supply apparatus according to claim 1, wherein the water drain plug side opening of the connection pipe is arranged in the case. 4. A water stopper is attached to the connection pipe, and the water stopper is arranged so as to be operable from the outside of the case.
The water heater according to any one of 3 above.