JPS632853Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a water heater equipped with a combustion device for heating water in a hot water storage tank.

Conventional configuration and its problems A conventional water heater of this type was configured as shown in FIG. That is, in this Figure 1,
1 is a hot water storage tank having a hot water supply port 2 on the top surface and a water supply port 3 on the lower side wall.
A heat exchanger 4 is provided in the lower part of the hot water storage tank 1 so as to penetrate inside the hot water storage tank 1. And this heat exchanger 4
has one end open and the other end closed; a combustion device 5 serving as a heating means is attached to the open end, and an opening 6 is partially provided at the other end. Furthermore, this opening 6 is connected to a chimney 7 and a chimney top 8 through which the combustion exhaust gas of the combustion device 5 is discharged. Further, a baffle plate 9 is provided in the heat exchanger 4, and heats the water in the hot water storage tank 1 by transferring the combustion heat generated by the combustion of the combustion device 5 from the outer periphery of the heat exchanger 4. 1
Reference numeral 0 denotes an exterior body that covers the hot water storage tank 1, combustion device 4, etc., and the portion of this exterior body 10 facing the combustion device 4 has an opening 11 for attaching the combustion device 4.
has been established. Reference numeral 12 denotes a cover detachably attached to the exterior body 5 for maintenance and inspection of the combustion device 4. A combustion air intake port 13 is formed on the lower surface of the cover 12 by cutting and raising a portion.
is formed. 14 is an intake port provided in the combustion device 4.

In the above-mentioned conventional water heater, the combustion air taken into the cover 12 from the combustion air intake port 13 passes through the intake port 14 of the combustion device 5 to the combustion device 5.
The combustion gas generated by combustion passes through the baffle plate 9, and transfers the combustion gas heat from the outer periphery of the heat exchanger 4 to the hot water storage tank 1. It heats water to obtain hot water.

When performing the above combustion, there is generally a range of mixing ratios between combustion air and fuel, and normal combustion will not occur if there is too much or too little combustion air. When combustion air is inhaled from the outside, the outside air contains various types of dust and dust, so when combustion air is inhaled from the outside, these dust and dirt are inhaled at the same time. Conventional water heaters do not have any means to prevent the inhalation of these dusts and dirt, so these dusts and dirt are not absorbed by the combustion device 5.
Inside, there is a combustion air passage, a blower and blower fan that sucks combustion air, a mixing chamber where combustion air and fuel are mixed, a uniform plate that uniformly passes the mixture of combustion air and fuel, and a An ignition device that ignites the fuel mixture; a flame-holding plate that stabilizes the combustion flame formed by the ignition device;
The combustion flame will adhere to the flashback prevention plate (none of which is shown), which is used to prevent flashback into the mixing chamber, and this will act as resistance when the combustion air passes through. Since the amount of ventilation of the mixture of combustion air and fuel is reduced, there is a problem in that the mixture ratio of combustion air and fuel is disrupted, resulting in abnormal combustion.

Purpose of the invention In view of the above-mentioned conventional problems, the object of the present invention is to provide a water heater that can prevent dust and dirt contained in the outside air from entering the combustion device. be.

Structure of the Invention In order to achieve the above object, the present invention includes a cover that covers the combustion device and forms a space around the combustion device, which is removably attached to the exterior body, and a combustion air outlet provided at the bottom of the cover. an intake port;
an intake port provided in the combustion device, a first dustproof filter is provided at the combustion air intake port, a second dustproof filter having a mesh smaller than the first dustproof filter is provided at the intake port, and the first dustproof filter is provided at the combustion air intake port. With this configuration, when the combustion air of the combustion device is sucked in from the inlet, most of the dust and dirt contained in the combustion air is first removed from the intake port. The small dust particles that pass through the first dust filter can be completely captured by the second dust filter installed at the intake port of the combustion device. It is possible to prevent abnormal combustion caused by dirt and dust entering the combustion device, and since the first dust-proof filter on the combustion air intake side is removably installed, the first dust-proof filter catches Dust, dirt, etc. that have been removed can be easily removed by removing the first dustproof filter.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 7. In FIGS. 2 to 7, the same parts as in FIG. 1 showing the conventional example are given the same numbers, and only the points different from the conventional example will be explained. That is, in FIGS. 2 to 4, reference numeral 15 denotes a dust filter holding fitting provided on the cover 12 so as to face the combustion air intake port 13, and this holding fitting 15 is made by bending an elastic metal wire. As a result, it is configured in the shape shown in FIG. 5, and a substantially L-shaped screw tightening portion 15a is provided at the center of one end.
It is attached by screwing the screw 16 into the cover 12 through the screw 5a. When the dust filter holding fitting 15 is attached to the cover 12, the other end thereof comes into contact with the cover 12 due to its elastic force, as shown in FIG. Reference numeral 17 denotes a first dust-proof filter that is detachably attached to the dust-proof filter holding fitting 15. As shown in FIG. It is held by being inserted into the filter frame 18 from the left or right. The filter frame 18 is made of metal wire and has a frame shape, and bent portions 18a are provided at the left and right ends of the filter frame 18 to prevent the first dust filter 17 from shifting from side to side. In addition, the dust filter holding fitting 1
A bent portion 15b is provided at the other end of the filter frame 5 to facilitate insertion of the filter frame 18.

In the above configuration, the first dust filter 17
When attaching the dustproof filter 17 to the dustproof filter holding fitting 15, from the state shown in FIG.
When the filter frame 18 holding the filter frame 18 is pushed in against the elastic force of the holding fitting 15, the dustproof filter 17 is held by the holding fitting 15 so as to face the combustion air intake port 13, as shown in FIG. In this case, when the filter frame 18 is pushed into the holding fitting 15, the filter frame 18 and the first dust-proof filter 17 are sandwiched between the cover 12 and the cover 12 due to the elastic restoring force of the holding fitting 15. As a result, the combustion air always passes through the first dustproof filter 17 and enters the cover 12 from the combustion air intake port 13.
Dust and dust contained in this combustion air are
can be captured by the dust filter 17.

Furthermore, a second dustproof filter 19 is provided at the intake port 14 of the combustion device 5 shown in FIG.
As shown in FIG. 6, this second dustproof filter 19 is made of a material different from that of the first dustproof filter 17.
That is, it is constructed in a box-like shape using a wire mesh with a small mesh, and is attached to the fixture 20. As shown in FIG. 7, this fixture 20 is fixed with screws 21 so as to cover the intake port 14 of the combustion device 5. Therefore, this second dustproof filter 19 is located in the space within the cover 12 and above the first dustproof filter 17. 22 is an air regulating member attached to the intake port 14 of the combustion device 5. Note that the second dustproof filter 19
The fixing fitting 20 is not divided into two parts as in the embodiment, but
It is possible to integrate them.

As mentioned above, the dust and the like contained in the combustion air are captured by the first dustproof filter 17, but when the first dustproof filter 17 is made of a material such as polyester nonwoven fabric, long fibers are captured by the first dustproof filter 17. Although dust and dust with large particle sizes can be captured reliably, short fiber-like dust and dust with small particle sizes will pass through. The dust that has passed through the first dustproof filter 17 enters the cover 12 and is completely captured by the second dustproof filter 19 provided at the intake port 14 of the combustion device. However, the area around the second dustproof filter 19 is a space and the air flow rate is extremely low, so some of the dust settles down inside the cover 12, so the amount of dust etc. captured by the second dustproof filter 19 decreases. do. As a result, the combustion device 5
This prevents dust, dust, etc. contained in the combustion air from entering the combustion air. Further, most of the dust and dust contained in the combustion air is captured by the first dustproof filter 17, but in this case, the first dustproof filter 17 is detachably attached to the combustion air intake 14. Therefore, it can be easily removed by removing the first dustproof filter 17 from the outside of the water heater.

In the above embodiment, the first dustproof filter 17 and the second dustproof filter 19 are made of different materials, but they may be made of the same material with different meshes. .

Effects of the invention As described above, according to the invention, a cover that covers the combustion device and forms a space around the combustion device is removably attached to the exterior body, and a combustion air intake is provided at the bottom of the cover. and an intake port provided in the combustion device, a first dustproof filter is attached to the combustion air intake port,
Since the second dustproof filters are each provided with a mesh smaller than the dustproof filters, and the first dustproof filter is detachably attached, there is no possibility that the combustion air will be contained in the combustion air when it is taken in from the inlet of the combustion device. Most of the dust and dust that enters the air is first captured by the first dustproof filter, and some of the small dust that passes through the first dustproof filter sinks into the cover and some of it is captured by the second dustproof filter. This eliminates the possibility of abnormal combustion caused by dust entering the combustion device, and reduces the amount of dust that should be captured by the second dust filter. It takes longer to get clogged, which means that maintenance and cleaning can take longer. In addition, the dust-proof filter on the combustion air intake side is removably installed, so the dust and dirt captured by this dust-proof filter can be easily removed by removing the dust-proof filter. This has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a conventional water heater, Fig. 2 is a side sectional view of a water heater showing an embodiment of the present invention, and Fig. 3 is the attachment of a dustproof filter holding bracket to the cover of the same water heater. Fig. 4 is a side sectional view showing how the dustproof filter is attached to the holding fitting, Fig. 5 is an exploded perspective view showing the configuration of the holding fitting and the dustproof filter, etc., and Fig. 6 is a side sectional view showing the state. FIG. 7 is a perspective view of a dustproof filter attached to the intake port of the combustion device in the hot water heater, and FIG. 7 is a side sectional view showing the attached state of the dustproof filter. 1...Hot water storage tank, 2...Hot water inlet, 3...Water inlet, 5...Combustion device, 10...Exterior body, 12...
Cover, 13...Combustion air intake port, 14...Intake port, 17...First dustproof filter, 19...Second dustproof filter.

Claims (1)

[Scope of utility model registration request] A hot water storage tank having a water supply port and a hot water supply port, a combustion device that heats water in the hot water storage tank, an exterior body that covers the hot water storage tank, and a space that covers the combustion device and surrounds the combustion device. It includes a cover removably attached to the exterior body, a combustion air intake provided at the bottom of the cover, and an intake port provided in the combustion device, and a first dustproof filter is provided in the combustion air intake. A water heater, wherein a second dustproof filter having a mesh smaller than that of the first dustproof filter is provided at each of the intake ports, and the first dustproof filter is detachably attached.