JPH0634203A - Water heater - Google Patents

Abstract

PURPOSE:To improve a supply air filtering performance of a water heater and also the maintenance of a supply air filter. CONSTITUTION:A supply air box 4 having a supply air filter fitted is provided separately from the main body 2 of a water heater and the two components are made to communicate with each other by a supply air tube 3. Accordingly, the effective area of the filter can be widened irrespective of the sizes of the main body 2 of the water heater and fitting and removal of the supply air filter are facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater for combusting air forcibly by a fan to mix it with fuel gas, and heats cold water by burning the mixture to supply hot water.

[0002]

2. Description of the Related Art Conventionally, in a water heater that supplies combustion air with a fan, an air supply port (glare) G is formed in a main body case (front cover) C as shown in FIG. Combustion air is taken in through the air outlet G. And dust that is sucked in with the supply of combustion air,
An air supply filter F is provided inside the air supply port G to prevent oil and the like from adhering to the fan and burner flame ports.

[0003]

However, if the device is made compact due to the recent needs, the effective area of the air supply filter cannot be secured enough, and sufficient filtering cannot be performed. In particular, when trying to make the water heater thin, it is unavoidable to use a thin reticulated air supply filter because of the installation space of the air supply filter.
Filtering performance is poor. In addition, when cleaning the air supply filter, it is necessary to remove the front cover one by one with a screwdriver or the like, which causes a problem that cleaning is difficult.

[0004]

A first water heater according to the present invention which solves the above-mentioned problems, compulsorily blows combustion air by a fan to mix it with fuel gas, and burns the mixture to produce cold water. A water heater main body for heating and supplying hot water, an air supply box provided outside the water heater main body and equipped with an air supply filter, and an air supply pipe communicating the water heater main body and the air supply box, The gist is that the combustion air is sucked from the air supply box and introduced into the water heater main body through the air supply pipe.

In the second water heater of the present invention, the combustion air is forcibly blown by the fan to mix with the fuel gas,
The water heater main body that supplies cold water by heating cold water by burning the air-fuel mixture is connected outward from the water heater main body,
It is provided with an air supply pipe equipped with an air supply filter, and the gist is to suck the combustion air from the air supply pipe and guide it into the water heater body.

[0006]

In the first water heater of the present invention having the above structure, negative pressure is generated in the air supply pipe by the intake pressure of the water heater body, and air is sucked from the air supply box. At this time, the air taken in passes through the air supply filter mounted on the air supply box to remove dust and oil, and is supplied to the water heater body. Although the position of the water heater main body is determined depending on the convenience of use, the air supply box can be arbitrarily installed at a position where there is little dust or oil, so the degree of contamination of the air supply filter can be reduced and the number of cleanings can be reduced. Further, since the air supply filter is not provided in the water heater main body, the filter effective area can be sufficiently taken regardless of the water heater main body size, and the selection range of the filter material can be widened to improve the filtering performance. . In addition, it is possible to easily attach and detach the air supply filter.

On the other hand, in the second water heater of the present invention, since the air supply pipe is connected to the outside of the water heater main body and the air supply filter is attached to this air supply pipe, the intake pressure of the water heater main body causes The air taken into the air supply pipe passes through the air supply filter and is sent to the water heater body. Therefore, since the air supply filter is provided in the air supply pipe outside the water heater main body, the filter effective area can be sufficiently taken regardless of the main body size, and the selection range of the filter material can be widened to improve the filtering performance. . Further, the air supply box used in the first invention is unnecessary, and the installability is good. The water heater itself that combusts and heats the combustion air by forcibly blowing it with a fan may be a forced air supply type that sucks the combustion air with an air supply fan. A forced exhaust type that sucks in air for use may be used.

[0008]

EXAMPLES In order to further clarify the constitution and operation of the present invention described above, preferred examples of the water heater of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a water heater as an example. The water heater 1 is provided at a main body 2 for supplying hot water by gas combustion (a water heater main body of the present invention), an air supply pipe 3 serving as a flow path for sending combustion air to the main body 2, and an end of the air supply pipe 3. It consists of an air supply box 4.

The main body 2 includes a combustion chamber 22 provided in the main body case 21, a burner 23 provided in the combustion chamber 22,
A heat exchanger 24 provided above the burner 23 for transferring combustion heat to cold water, an exhaust port 25 for discharging combustion exhaust, a combustion chamber 2
2, an air supply fan 26 that supplies combustion air to the combustion chamber from below, a solenoid valve 27 that opens and closes a gas flow path to the burner 23,
It comprises a water supply pipe 28 to which cold water is supplied, a hot water supply pipe 29 for delivering heated hot water, an ignition device (not shown), a combustion control device, and the like. Further, a cylindrical tubular air supply port 30 is formed on the upper portion of the main body case 2.

An end of the air supply pipe 3 is connected to the air supply port 30, and an air supply box 4 is connected to the other end of the air supply pipe 3. In this way, the air supply box 4 → the air supply pipe 3 → the main body 2
The air supply path is constructed. The water heater 1 of the present embodiment is of a forced air supply type, and is driven by an air supply fan 26 so that combustion air is sucked from the air supply box 4 and sent to the combustion chamber 22.

Next, various embodiments of the air supply box 4 will be described with reference to FIGS. In the air supply box 4A shown in FIG. 2, an air supply filter 43 folded in a bellows shape is provided in a box body 42 having an opening 41 formed in the front surface.
It was inserted from. A micro switch 44 that detects whether or not the air supply filter 43 is attached is provided inside the side surface of the box body 42, and this signal line (not shown) is connected to the combustion control device of the main body. Then, the combustion control device is set to prohibit the combustion operation based on the on / off state of the micro switch 44 when the air supply filter 43 is not attached.

The combustion air is sucked through the opening 41 and passes through the air supply filter 43 to remove dust and oil, and is sent to the main body 2 via the air supply pipe 3. In this case, since the air supply filter 43 is folded in a bellows shape, the effective filter area can be increased and the filtering performance is high. Moreover, since the installation of the air supply filter 43 does not depend on the size of the main body 2, various filter materials and the like can be selected. Furthermore, when cleaning the air supply filter 43, the air supply filter 43 can be easily removed by simply pulling out the air supply filter 43 from the opening 41, which is very convenient. Although the installation position of the main body 2 is determined depending on the convenience of use, since the air supply box 4A can be arbitrarily installed at a position where there is little dust or oil, the degree of contamination of the air supply filter 43 is reduced and the number of cleanings can be reduced. it can.

A second embodiment of the air supply box 4 is shown in FIG. In the air supply box 4B, a partition plate 54 is provided above the inside of the box body 52, an opening 51 is formed on the front surface below the partition plate 54, and an air supply filter 53 folded in a bellows shape is formed from the opening 51. It is inserted. The ends of the partition plate 54 and the air supply filter 53 on the inner side are the box body 52.
The rear side 52B to slightly front side, the opening 51
The combustion air sucked in from is sent to the back surface of the air supply filter 53 and then guided to the air supply pipe 3.

Therefore, similar to the above-described embodiment, the filtering performance can be improved, and the air supply filter 53 can be easily attached and detached, which is very convenient. Further, the dirt of the air supply filter 53 becomes more uniform than in the previous embodiment. In addition, in the present embodiment and the embodiments described below, a micro switch for detecting the presence or absence of the air supply filter is omitted, but such a detecting means may be provided.

A third embodiment of the air supply box 4 is shown in FIG. This air supply box 4C forms a frame body with a semicircular upper plate 60 and a lower plate 61 facing each other vertically and a back plate 62 connecting the two, and the air supply filter 6 is provided in a space surrounded by each plate.
3 is inserted. The air supply filter 63 is a tubular body in which a filter plate material is bent into a bellows shape and each bent portion is formed into a star shape (half) along the outer circumference of the upper plate 60 and the lower plate 61.
Therefore, the suction force of the main body 2 causes the combustion air to pass through the air supply filter 63 and be sent to the main body 2. According to the air supply box 4C, in addition to the effect of the above-described embodiment, the air for combustion is also sucked in from the lateral direction, so that the air supply box 4C itself can be made compact.

A fourth embodiment of the air supply box 4 is shown in FIG. The air supply box 4D has openings 71, 72, 73 formed on the front surface and both side surfaces of the box body 70, and elongated slide holes 75, on the front edge and side edges of the upper plate 74 of the box body 70. 76 and 77 are opened, and these slide holes 75 and 7
Plate-like air supply filters 78 from 6 and 77 are slid and inserted, respectively. According to the air supply box 4D, the structure is simple, and the air supply filter 78 can be attached and detached very easily. Although not shown, in the box 70,
A guide groove or the like is formed so that the air supply filter 78 is inserted straight.

The embodiment of the first water heater of the present invention has been described above. Next, the embodiment of the second water heater of the present invention will be described. FIG. 6A is a schematic view of a water heater as an example. The water heater 80 comprises the main body 2 shown in the previous embodiment and the air supply pipe 81 connected to the air supply port 30 and extending in the lateral direction. This air supply pipe 81 is shown in FIG.
As shown in FIG.
3 is formed, and a cylindrical air supply filter 84 is further inserted into the cylindrical body 82, the tip of which is the end cap 8
It is blocked by fitting 5.

According to the water heater 80, the combustion air is sucked from the air suction port 83 of the air supply pipe 81 by the suction force of the main body 2, and the dust and oil are removed by the air supply filter 84 passing at this time. It In this case, the effective filter area is irrelevant to the size of the main body 2, and good filtering performance can be obtained by arbitrarily selecting the length, diameter, type of the air supply filter, etc. of the air supply pipe 81.
Further, by directing the air supply pipe 81 to a position with less dust such as an upward direction or a downward direction, the degree of contamination of the air supply filter 84 is reduced and the number of cleanings can be reduced. Further, the air supply box 4 used in the first aspect of the invention is unnecessary, and the installability is improved. Further, cleaning can be easily started only by removing the end cap 85 and pulling out the air supply filter 84.

The embodiment of the present invention has been described above.
The present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[0020]

As described above in detail, according to the water heater of the present invention, the filtering performance is improved and the maintenance of the air supply filter is facilitated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a water heater as an embodiment of the first invention.

FIG. 2 is a perspective view showing a first embodiment of an air supply box.

FIG. 3 is a perspective view showing a second embodiment of an air supply box.

FIG. 4 is a perspective view showing a third embodiment of an air supply box.

FIG. 5 is a perspective view showing a fourth embodiment of an air supply box.

FIG. 6 is a schematic view of a water heater as an embodiment of the second invention.

FIG. 7 is a schematic front view of a conventional water heater.

[Explanation of symbols]

1, 80 ... Water heater, 2 ... Main body part, 3, 81 ... Air supply pipe, 4, 4A, 4B, 4C, 4D ... Air supply box, 26
... Air supply fan, 43, 53, 63, 78, 84 ... Air supply filter.

Claims (2)

[Claims] 1. A water heater main body for forcibly blowing air for combustion with a fuel gas to mix it with a fuel gas, heating cold water by the combustion of the mixture to supply hot water, and a water heater main body provided outside the water heater main body. An air supply box equipped with an air supply filter, and an air supply pipe that connects the water heater main body and the air supply box to each other. Combustion air is sucked from the air supply box, and the air is supplied via the air supply pipe. A water heater characterized by being guided into the body of the water heater. 2. A water heater main body for forcibly blowing combustion air by a fan to mix with fuel gas and heating cold water by the combustion of the mixture to supply hot water, and to the outside of the water heater main body. A water heater connected to the water heater and having an air supply filter attached thereto, and sucks combustion air from the air supply pipe and guides it into the water heater body.