JPH0442679Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a gas water heater having a structure for discharging exhaust gas to the rear.

<Problems to be solved by conventional technology and ideas> Since gas water heaters, especially central type ones, are large in size, in order to save installation space, gas meters and electric meters, such as those shown in Figure 6, have been installed. The meter box 32 may be installed in a meter box 32 that accommodates a water meter, etc. and has the necessary piping.

In this case, if the gas water heater 31 is of the type that takes in and exhausts air from the front, the door 3 of the meter box should be closed so that the front of the gas water heater 31 faces the passage 33.
Must be installed flush with 4. However, with this mounting structure, exhaust gas flows into the passage, causing an increase in the temperature of the passage and contamination of the air. Furthermore, it is necessary to install the gas water heater 31 at a high position so that the exhaust air does not directly hit people.

Therefore, as shown by the broken line in FIG. 6, an exhaust port 35 is extended to the front of the gas water heater.
Connect the exhaust pipe 36 from the
A structure is adopted in which the ceiling of No. 3 is extended to release exhaust air to the outside.

However, with this structure, the exhaust pipe 36 is exposed in front of the gas water heater 31, so it is easily damaged and is conspicuous, which impairs the appearance of the passage.

Therefore, it may be possible to take out the exhaust pipe from behind the gas water heater. That is, the exhaust pipe is inserted into an insertion hole formed on the back surface of the water heater cover, and then connected to the outlet of an exhaust fan unit built into the water heater. However, various meters are placed inside the meter box,
In addition, since the pipes run in all directions, there was a problem in that it was impossible for a person to enter the gas water heater and insert the exhaust pipe into the insertion hole from behind the gas water heater.

<Purpose of the invention> This invention was made in view of the above-mentioned problems, and aims to provide a gas water heater in which the work to draw the exhaust stack from the back of the water heater can be done from the front of the gas water heater. The purpose is

<Means for Solving the Problems> In order to achieve the above object, the gas water heater of this invention has an insertion hole on the back of the water heater cover for drawing the exhaust pipe into the position corresponding to the outlet of the exhaust fan unit. and a construction hole that can be passed through by extending your hand from the front of the gas water heater to the back of the water heater cover and pulling the exhaust pipe into the insertion hole. The gas water heater is equipped with a fixing means for fixing the gas water heater from the front side, and a sealing plate that closes the construction hole when the construction hole is not in use.

<Function> If the gas water heater has the above configuration, insert your hand from the front of the gas water heater through the construction hole provided on the back of the water heater cover, and insert the exhaust pipe placed behind the gas water heater into the insertion hole. Through the cover, the exhaust pipe can be fixed to the cover without going behind the water heater by aligning it with the position corresponding to the outlet of the exhaust fan unit and using the fixing means.

<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.

FIG. 1 is an exploded perspective view showing an embodiment of the gas water heater of this invention. The interior of the gas water heater 1 is provided with a heat absorption part 3a that exchanges heat with the water introduced into the circulation pipe 3b, and the water that has passed through the heat absorption part 3a is heated and sent to a hot water supply port (not shown). be provided. Referring also to FIG. 2, on the upper surface of the heat absorption part 3a,
An exhaust duct 3 whose lower end is open to take in exhaust gas is provided. An exhaust fan unit 4 is removably attached to the side surface of the exhaust duct 3 via a mounting plate 5. The inside of the exhaust duct 3 communicates with the inside of the exhaust fan unit 4, and the exhaust gas taken into the exhaust duct 3 is sucked into the exhaust fan unit 4. 6 is a motor that drives the exhaust fan.

On the back of the water heater cover 2, there is an exhaust pipe joint 11.
An insertion hole 7 is formed through which the exhaust fan unit 4 is drawn into a position corresponding to the outlet of the exhaust fan unit 4. The exhaust pipe joint 11 has a flange portion 17 and a screw 13.
It is fixed to the water heater cover 2 from the front with screws. Further, on the back surface of the water heater cover 2, a construction hole 8 is formed through which the exhaust pipe joint 11 can be inserted by hand into the insertion hole 7. As shown in FIG. 3, the construction hole 8 is usually
It is closed with a seal plate 9. This is to prevent air intake and exhaust from entering the meter box through the construction hole 8 for safety reasons. 10 is a screw for fixing the seal plate 9.

Next, a method for installing the exhaust pipe 15 will be explained. FIG. 4 shows a state in which the gas water heater 1 is attached to the top of the door 24 of the meter box 22 flush with the door 24, and the exhaust pipe 15 is placed from the ceiling of the meter box 22 to the back of the gas water heater 1. FIG. An exhaust pipe joint 11 is fitted into the tip of the exhaust pipe 15 in advance. First, the front cover 2a of the gas water heater 1 is removed, and the exhaust fan unit 4 and motor 6 are removed from the exhaust duct 3. Figure 3 shows the removed state. Then, loosen the screws 10, remove the seal plate 9, open the installation hole 8 on the back of the water heater cover 2, and then pass your hand through the installation hole 8.
Hold the exhaust pipe joint 11, insert it into the insertion hole 7, and pull it toward you. Next, the flange portion 17 of the exhaust pipe joint 11 is adjusted to a predetermined position and screwed down using the screw 13 as a fixing means. The screws are fastened from the front of the gas water heater 1. In this way, the exhaust pipe joint 11 of the exhaust pipe 15 is fixed to the water heater cover 2 while being inserted through the insertion hole 7 (see FIG. 5). After the fixation is completed, the connection portion between the exhaust pipe joint 11 and the exhaust pipe 15 is wrapped with aluminum tape 16 to seal it. Thereafter, the construction hole 8 is removed, the seal plate 9 is fixed, and the construction hole 8 is closed. Then, the air outlet 12 of the exhaust fan unit 4
into the exhaust pipe joint 11 via the O-ring 14, and connect the exhaust fan unit 4 to the exhaust duct 3.
Fixed to.

In this way, the exhaust pipe 15 can be easily connected to the gas water heater 1 without entering the meter box 22 and going around the back of the gas water heater 1.

Note that this invention is not limited to the above-mentioned embodiment. For example, in addition to screws, the fixing means may include a male thread with a groove cut on the outer diameter of the exhaust pipe joint 11, and a male thread that is grooved on the outer diameter of the exhaust pipe joint 11, and The water heater cover 2 may be inserted and fixed using a large-diameter nut that is screwed into the male thread. Various other design changes can be made without changing the gist of the invention.

<Effects of the invention> As described above, this invention allows the connection between the exhaust pipe and the exhaust fan unit to be made without having to go around the back of the gas water heater by providing a construction hole on the back of the water heater cover. It has the unique practical effect of improving performance.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the gas water heater of this invention, Fig. 2 is a partial view showing the state where the front lid of the water heater cover is opened, and Fig. 3 is an exhaust from the state shown in Fig. 2. Figure 4 shows the gas water heater of this invention installed in the meter box and the exhaust pipe is connected. Figure 5 is a cross-section taken along the line - in Figure 2. FIG. 6 is a diagram showing a state in which a conventional gas water heater is placed in a meter box. 1...Gas water heater, 2...Water heater cover, 4...
...exhaust fan unit, 7...insertion hole, 8...construction hole, 12...air outlet, 13...screw as a fixing means, 15...exhaust pipe.

Claims (1)

[Scope of claim for utility model registration] In a gas water heater that has a built-in exhaust fan unit that blows out exhaust gas, the back of the water heater cover has an insertion hole for drawing the exhaust pipe into a position corresponding to the outlet of the exhaust fan unit, and a gas A construction hole is provided on the same surface that allows the hand to be passed from the front of the water heater to the back of the water heater cover to pull the exhaust pipe into the insertion hole, and the pulled-in exhaust pipe is placed against the water heater cover. A gas water heater characterized by comprising a fixing means for fixing the gas water heater from the front and a sealing plate for closing the construction hole when the construction hole is not in use.