JPH04288449A - Hot water feeder - Google Patents

Abstract

PURPOSE:To prevent a clogging at a drain valve with sediments by a method wherein an end part of a drain pipe suspending from a bottom part of a hot water storing tank is provided with an incrustation accumulator having an openable or closable cap and a branch pipe constituting a drain passage having a drain valve at its intermediate part is connected to an upper part of the incrustation accumulation part. CONSTITUTION:A drain pipe 2 is vertically suspended from a bottom part of a hot water storing tank of a hot water feeder and an end part of the drain pipe 2 is provided with an incrustation accumulation part 2a having an openable or closable cap 6. An upper part of the incrustation accumulation part 2a on the drain pipe 2 is provided with a branch pipe 2b for branching drain water and guiding the drain to an outer drain pipe 5, and the branch pipe 2b is provided with an automatic drain valve 3. Although sediments 7 such as incrustation generated within the hot water storing tank 1 under a use of long period of time passes through the drain pipe 2 together with the drain water, the sediments 7 are accumulated at the incrustation accumulation part 2a by their own weight, resulting in that only the drain water with the sedimentations being removed flows to the branch pipe 2b and then a clogging of the drain valve 3 with the sediments is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater, and more particularly to the structure of its drain pipe.

0002

2. Description of the Related Art FIG. 3 is a sectional view showing the entire structure of a water heater equipped with an automatic drain valve. In the figure, 1 is a hot water tank, 2 is a drain pipe attached to the bottom of the hot water tank 1, and 3 4 is an automatic drain valve, 4 is an overflow pipe, and 5 is an external drain port (not shown) where the drain pipe 2 and overflow pipe 4 come together
Shows external drain pipe leading to.

[0003] In this type of water heater, the automatic drain valve 3 is automatically controlled by a microcomputer or the like (hereinafter referred to as a microcomputer).
When the automatic drain valve 3 is opened by an electric signal from the microcomputer, the hot water in the hot water tank 1 is sent to the external drain port through the drain pipe 2 and the external drain pipe 5, and on the contrary, the hot water in the hot water tank 1 is When the water runs out, the automatic drain valve 3 closes and water is supplied to the hot water tank 1 from a water supply pipe (not shown), and when enough water is supplied to the hot water tank 1, boiling starts. ing.

0004

[Problem to be solved by the invention] The problem to be solved is that in the structure of conventional water heaters, deposits such as limescale generated in the hot water storage tank tend to clog the automatic drain valve. This is because it is the cause of the failure.

FIG. 4 is a partial cross-sectional view showing the structure near the automatic drain valve 3. The drain pipe 2 is attached to the bottom of the hot water storage tank 1, and the sediment 7 flows through the drain pipe 2 along with the drainage. There is a problem in that it collects in the automatic drain valve 3 and gets entangled in the valve mechanism, clogging the valve.

[0006]Although there are inventions and devices aimed at removing the precipitates that settle inside the hot water storage tank, such as the device disclosed in Utility Model Application Publication No. 60-48020 ``Thermal Storage Tank,'' Even if technology is used, clogging of the automatic drain valve 3 cannot be completely prevented. The present invention was made to solve this problem, and aims to provide a water heater that has a simple structure and eliminates the main cause of failure of the automatic drain valve.

[0007]

[Means for Solving the Problems] The water heater according to the present invention has a drain pipe vertically descending from the bottom of the hot water storage tank, and a scale reservoir having an openable and closable cap is provided at the end of the drain pipe.
The most important feature is that a branch pipe that forms the drainage channel is installed above the scale reservoir on the drain pipe, an automatic drain valve is installed on this branch pipe, and the automatic drain valve is positioned above the scale reservoir. It has the following characteristics.

[0008]

[Function] In the water heater of the present invention, since the scale reservoir is provided at a position perpendicular to the bottom of the hot water storage tank and below the automatic drain valve, the sediment discharged from the bottom of the hot water storage tank flows into this scale reservoir under its own weight. The sediment in the drain pipe can be removed by opening the cap at appropriate intervals and removing the accumulated sediment.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a partial cross-sectional view showing the structure around the automatic drain valve 3 in this embodiment. In the figure, 1 is a hot water storage tank, 2 is a drain pipe, and 2a is a A scale reservoir is installed at the end of a drain pipe 2 extending vertically from the bottom of the hot water tank 1, 2b is a branch pipe installed above the scale reservoir 2a on the drain pipe 2, and 3 is installed on the branch pipe 2b. 4 is an automatic drain valve, 4 is an overflow pipe, 5 is an external drain pipe where the end of the branch pipe 2b and the overflow pipe 4 come together to guide waste water to an external drain port (not shown), 6 is a limescale reservoir 2a
An openable/closable cap attached to the holder, 7 indicates deposits such as limescale.

As shown in FIGS. 1 and 2, the structure of the drain pipe of the water heater in this embodiment is such that a drain pipe 2 is vertically lowered from the bottom of the hot water tank 1, and a drain pipe 2 is opened and closed at the end of the water tank 1. A scale reservoir 2a having a cap 6 is provided, and a drain pipe 2 is provided.
A branch pipe 2b is provided above the upper limescale reservoir 2a to branch wastewater and lead it to an external drain pipe 5, and this branch pipe 2b is provided with an automatic drain valve 3, and the automatic drain valve 3 is connected to the limescale reservoir 2a.
The structure is such that it is located higher up.

[0011] Therefore, sediments 7 such as limescale generated in the hot water tank 1 due to long-term use etc. are discharged along with the drainage pipe 2.
As shown in Fig. 2, the discharged sediment 7 is deposited in the limescale reservoir 2a due to its own weight, and the drainage water from which the sediment 7 has been removed is sent to the branch pipe 2b. This eliminates the cause of failure in which sediments 7 become entangled in the automatic drain valve 3 provided on the branch pipe 2b and clog the valve mechanism.

[0012] Then, open the cap 6 at appropriate intervals,
By removing the sediment 7 that has accumulated in the scale reservoir 2a, it is possible to prevent the automatic drain valve 3 from malfunctioning, and further,
Even if the automatic drain valve 3 should become clogged, it can be easily cleaned by removing the cap 6 and inserting a wire or the like from there.

Although the above embodiment describes a water heater with an automatic drain valve, it goes without saying that the technique for preventing clogging of the valve can be applied to water heaters with manual valves or devices similar to water heaters. stomach.

[0014]

[Effects of the Invention] As explained above, the water heater of the present invention has
By installing a cleanable limescale reservoir below the automatic drain valve, it prevents sediment from flowing into the automatic drain valve and prevents the valve from clogging due to sediment, which is the main cause of failure of automatic drain valves. It has the advantage of being preventable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a partial sectional view showing the structure around the automatic drain valve in one embodiment of the present invention.

FIG. 3 is a sectional view showing the overall structure of a conventional water heater.

FIG. 4 is a partial cross-sectional view showing a structure near an automatic drain valve in a conventional device.

[Explanation of symbols]

1 Hot water storage tank 2 Drain pipe 2a Water scale reservoir 2b Branch pipe 3 Automatic drain valve 6 Cap 7. Precipitate

Claims (1)

[Claims] Claim 1: In a water heater having a structure in which a drain valve is provided on a drain path attached to the bottom of the hot water storage tank, and the water in the hot water storage tank is drained by opening the drain valve, the drain pipe extends vertically from the bottom of the hot water storage tank. is lowered to a predetermined position, a scale reservoir having an openable and closable cap is provided at the end of the drain pipe, and a branch pipe forming a drainage channel is provided above the scale reservoir on the drain pipe, and the branch pipe A water heater characterized in that the above-mentioned drain valve is attached to the water heater.