JPH09229484A - Water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater in which a water rate sensor using a magnet is not erroneously operated. SOLUTION: A water filter made of a plastic magnet is provided at the upstream side of a magnet type flow rate sensor to attract an iron powder mixed in with flowing water by a filter body 11 to prevent the powder from flowing to the downstream side. Accordingly, the erroneous operation caused because the powder is attracted to the sensor can be prevented. Since the filter is detachable at a water supply passage 1, even if the powder attracted to the body 11 is accumulated, it can be used for a long period by removing the body 11 from the water supply passage 1 and cleaning it.

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 a water heater having a water flow sensor that uses a magnet.

[0002]

2. Description of the Related Art Conventionally, in a water heater, a water flow sensor using a magnet has been used to detect the flow rate of water flowing through a water flow path and the presence or absence of water flow. Such a water flow sensor includes a flow sensor that measures the flow rate of water flowing through the detector by detecting changes in the magnetic field due to the rotation of a magnetized impeller, and a reed switch that detects the magnetic changes due to the rotation of a butterfly with a magnet attached. There is a water flow switch that detects the presence or absence of water flow by detecting.

[0003]

However, in such a water flow sensor, iron powder dispersed in the running water may be adsorbed on a magnetized rotating blade or a permanent magnet fixed to a butterfly, so that magnetic detection is performed. Affect the
It clogged with the inner wall of the water flow path and caused a malfunction.

A water heater according to the present invention has an object to solve the above problems and to provide a water heater in which a water flow sensor using a magnet does not malfunction.

[0005]

A water heater according to claim 1 of the present invention which solves the above-mentioned problems is provided with a water flow sensor for detecting the flow rate of water or the presence or absence of water flow based on a magnetic change. In the container, the gist is that a water filter formed of a resin containing a fine powder magnet is provided in the upstream water flow path of the water flow sensor.

A water heater according to a second aspect of the present invention for solving the above-mentioned problems is the water heater according to the first aspect, which is provided with a plug detachable from the water flow passage, and the water filter is fixed to the plug. That is the main point.

In the water heater according to claim 1 of the present invention having the above structure, the water filter formed by the resin mixed with the fine powder magnet is provided in the upstream water flow path of the water flow sensor. The water filter efficiently adsorbs the iron powder mixed in the running water, and prevents the iron powder from flowing to the downstream side. Therefore, it is possible to prevent malfunction caused by the adsorption of iron powder on the water flow sensor.

In the water heater according to claim 2 of the present invention having the above-mentioned structure, since the water filter is fixed to the plug removable from the water passage, the iron powder adsorbed on the water filter increases. Since the iron powder can be removed by easily removing the plug to which the water filter is fixed from the water flow path, the adsorption performance of the water filter can be maintained for a long period of time.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the water heater of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a water heater as one embodiment. This water heater has a water supply passage 1 to which cold water is supplied, a heat exchanger 3 provided in the middle of the water supply passage 1 and heated by a burner 2, and a hot water passage 4 connected to the downstream side of the heat exchanger 3. Prepare The water supply passage 1 is provided with a magnet type flow rate sensor 5 for detecting an incoming water flow rate and a water filter 10 for removing iron powder in running water on the upstream side of the magnet type flow rate sensor 5. Although not shown, a thermistor for detecting the temperature of flowing water, a fan for supplying combustion air, and the like are provided.

The magnet type flow rate sensor 5 comprises an impeller made of plastic containing magnet fine powder and axially supported in a cylindrical case, and a detection element provided in the case for detecting a change in magnetic field. Flows to rotate the impeller, the detection element detects a change in the magnetic field due to the rotation, outputs a pulse signal, and counts the number of pulses to measure the flow rate. The impeller may be a plastic impeller having a permanent magnet fixed to the tip thereof.

As shown in FIG. 2, the water filter 10 has a meshed cylindrical filter body 11 made of plastic containing magnet fine powder, a lid 12 for fixing the filter body 11 at a joint surface 12a, and a joint surface 12b of the lid 12. And an O-ring 13 attached to the. As shown in FIG. 3, the water filter 10 having the above-described structure is provided with the insertion hole 1 of the water supply passage 1.
It is inserted in a, and water leakage is prevented by the O-ring 13. Further, as shown in the view from the arrow A of FIG. 4, the U-shaped stop pin 14 is inserted into the insertion hole 1b provided in the insertion hole 1a, and the lid 12 is fixed so as not to come off from the water supply pipe 1.

Water flowing from the upstream side (lower side in FIG. 3) of the water supply passage 1 by using the water heater flows to the bypass flow passage 1d by the guide wall 1c provided in the water supply passage 1 and the filter body 11 Will be sent inside. The water sent to the inside of the filter body 11 flows through the mesh of the filter body 11 to the downstream side (upper side in FIG. 3) where the magnet type flow sensor 5 is provided. In this way water is filtered
By flowing through the mesh of No. 1, the iron powder mixed in the running water is adsorbed by the magnetic force of the filter body 11, and the iron powder can be prevented from flowing to the downstream side of the water filter 10.

Further, when the iron powder adsorbed on the filter body 11 is accumulated, the filter body 11 can be pulled out to remove the iron powder and dust. Therefore, the filter body 11 can be cleaned regularly for a long period of time. The adsorption performance can be maintained.

As described above, according to the water heater of the present embodiment, since the water passes through the mesh of the filter body 11, the iron powder in the running water is efficiently adsorbed and the magnet type flow rate sensor 5 provided on the downstream side. Easy to use to prevent malfunction. Further, since the mesh of the filter body 11 can remove dust other than iron powder, it also performs a normal filter function. Further, since iron powder is adsorbed and the mesh becomes smaller, finer dust than a normal filter can be removed. . Further, since the water filter 10 can be easily attached and detached from the water supply passage 1, even when iron powder adsorbed on the filter body 11 is collected, it can be used for a long time by removing it from the water supply passage 1 and cleaning it. Further, since the filter body 11 is formed in a cylindrical shape, the mesh area is wide, and the number of times of cleaning the filter body 11 is small, which is convenient. Further, since the filter main body 11 is molded from plastic containing magnet fine powder, the cost is low and the molding is easy.

The embodiments of the present invention have been described above.
The present invention is not limited to such an embodiment. For example, instead of a flow sensor using a rotating impeller, a butterfly to which a magnet is fixed rotates by water flow to turn on a reed switch. A switch may be used, which is effective for all water flow sensors that detect water flow based on a magnetic change, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention.

[0016]

As described in detail above, claim 1 of the present invention
According to the water heater described, the water filter formed of resin mixed with a fine powder magnet efficiently adsorbs iron powder mixed in running water and prevents malfunction of the water flow sensor provided on the downstream side, which is convenient for use. Good. Further, since the resin is mixed with the fine powder magnet, the cost is low and the molding and the mounting are easy.

Further, according to the water heater of the second aspect of the present invention, when the iron powder adsorbed on the water filter is accumulated, the water filter can be easily removed from the water passage to remove the iron powder. Therefore, the adsorption performance of the water filter can be maintained for a long period of time, which is economical.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater as one embodiment.

FIG. 2 is a configuration diagram of a water filter of the present embodiment.

FIG. 3 is a cross-sectional view of a water supply passage equipped with a water filter.

FIG. 4 is a view taken in the direction of arrow A in FIG. 3;

[Explanation of symbols]

1 ... Water supply channel, 5 ... Magnet type flow sensor, 10
... water filter, 11 ... filter body, 12 ... lid,
13 ... O-ring, 14 ... stop pin.

Claims (2)

[Claims] 1. A water heater equipped with a water flow sensor for detecting the flow rate of water flow or the presence / absence of water flow based on a magnetic change, wherein the upstream water flow path of the water flow sensor is molded with resin containing a fine magnet. A water heater characterized by having a water filter. 2. The water heater according to claim 1, further comprising a plug detachable from the water flow passage, wherein the water filter is detachably fixed to the plug.