JPS6133473Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a forced air-cooled instantaneous water heater that forcibly cools the inner shell of two heat-absorbing parts and supplies air to the combustion part through a single blower. It is.

In recent years, water heaters with large combustion capacities have become popular as hot water is used for various purposes such as hot water supply, bathing, and space heating. In order to be able to use different water heaters according to their capacity and to achieve centralized control, a device was devised and put into practical use that had two water heaters with different hot water supply capacities built into the cabinet to increase the efficiency of their use. ing. In this type of appliance, for example, as shown in Fig. 1, an exhaust collector C is installed above water heaters A and B, which have a heat absorbing part a with a large hot water supply capacity and a heat absorbing part b with a small hot water supply capacity, and an exhaust collector C is installed on the downstream side. An exhaust pipe d is drawn out from the exhaust pipe d, and a blower e is disposed in the middle of the exhaust pipe d, and fresh air is drawn into the combustion part f by the rotation of the fan of the blower e and the traction generated by exhaust gas discharge.
There is a so-called suction type that causes suction to be applied to and g.
However, with this suction type, it is necessary to suck in the gas-expanded high-temperature exhaust gas, so not only does the fan characteristic of the blower become large, but it is also necessary to install the blower at one end of the exhaust stack. Since fans and fan motors are heated by exhaust heat and cause failures, a heat-resistant blower is required to deal with this problem, and the structure of the surrounding exhaust system also needs to include some type of heat-reducing means. As a result, the structure is complicated and large, resulting in high costs. Furthermore, since the above-mentioned blower is installed in an exhaust pipe that protrudes outdoors, there is also a problem in terms of noise.

In order to solve the problems of conventional forced air-cooled instantaneous water heaters as mentioned above, this invention has a heat absorbing section at the top.
Two inner shells with a burner group arranged at the bottom and a combustion chamber inside are enclosed in an airtight manner by an outer shell to form air passages surrounding both inner shells, and both inner shells are placed opposite each other. A ventilation tube is provided at a predetermined portion of the lower part of the outer shell, the upper end of which is sealed, and a discharge port is bored at the lower side of the cylinder at a position facing the inner shell side wall. The air passages are communicated with each other through communication portions, and an air blower hole is provided in the outer body of the lower part of the air passage, and the air sucked by the blower is sent into the ventilation cylinder, and the air that is sent out is After both inner shells are cooled, they enter each combustion chamber through the two communication sections and reach both burner groups, thereby eliminating the need for a special heat-resistant blower and simplifying the exhaust stack system. The object of the present invention is to provide a forced air-cooled instantaneous water heater of a push-in type that can be miniaturized, manufactured at low cost, and operated quietly.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the forced air-cooled instantaneous water heater of the present invention will be described below with reference to the accompanying drawings.

In Fig. 2, 1 is the inner shell, and there is a heat absorption part 2 at the top.
is arranged, and a combustion chamber 3 is formed inside. 1a
An inner shell is smaller than or of the same type as the inner shell 1 (the example shows a small size), and has a heat absorbing portion 2a disposed in the upper part and a combustion chamber 3a formed inside. Reference numeral 4 denotes an exhaust pipe extending from the upper part of the heat absorbing parts 2 and 2a. Reference numeral 5 denotes an outer shell which seals and surrounds the inner shells 1 and 1a with a space between their front and rear walls and outer walls, and includes burner groups 17 and 17a, which will be described later, and each space is a These become airways 6 and 6a. Reference numeral 7 designates a cylindrical ventilation tube that forms the same space as the air supply passages 6, 6a between the inner walls of the inner shells 1 and 1a, and closes the upper end thereof, and closes the inner shell 1, 1a near the upper end thereof. A discharge port 8 is located at a position facing the inner wall of 1a.
and 8a, and their bases are erected in line with the air supply holes 9 formed in the lower part of the outer body 5. The openings of the discharge ports 8 and 8a have an area that allows primary air and secondary air to be supplied to the burner groups 17 and 17a, respectively, after cooling the inner shells 1 and 1a. Reference numeral 10 denotes a blower provided below the air blowing hole 9. Reference numeral 11 indicates the combustion chamber 3 and the air supply path 6 in the lower part of the inner shell 1.
It is a communication part that communicates with 11a is the inner shell 1a
and the combustion chamber 3a and the air supply passage 6a at the lower part.
It is a communication part that communicates with Reference numeral 12 denotes a water supply pipe, and one side is connected to the heat absorption pipe 13 of the heat absorption section 2 through a well-known hydraulic actuator, water flow switch, etc. control device starting part (not shown) on the upstream side, and the other branch is connected to the heat absorption pipe 13 from the middle. It is connected to the heat absorption pipe 13a of the heat absorption section 2a. Reference numeral 14 denotes a water stop valve interposed on the branch side of the water supply pipe 12. 15 is a hot water supply pipe led out from the heat absorption pipe 13. 15a is the heat absorption tube 13
This is the hot water supply pipe derived from a. The downstream ends of the hot water supply pipes 15 and 15a are connected to a hot water tap at an appropriate location by merging or branching. Reference numeral 16 denotes a gas manifold arranged at the lower part of the combustion chamber 3, and is provided with a plurality of nozzles arranged opposite to the burner group 17.
Reference numeral 16a denotes a gas manifold arranged at the lower part of the combustion chamber 3a, and is provided with a plurality of nozzles arranged opposite to the burner group 17a. The burner group 17a has a combustion capacity smaller than that of the burner group 17 or the same capacity (the embodiment shows one having a smaller capacity). A gas conduit 18 is branched downstream and connected to the gas manifold 16 and the gas manifold 16a. Reference numeral 19 denotes a control valve for stopping gas supply, which is separated downstream of the gas conduit 18.

The blower 10 is configured to be started by the control device at the same time as or prior to the start of combustion of the gas in the burner group 17 or 17a, and to stop supplying air at the same time as the combustion stops or with a slight delay after the stop. has been done.

Next, we will explain the operation of the forced air-cooled instantaneous water heater with the above-mentioned configuration, but there is no difference in the operation of the water heater and the operation of the burner group from that of a normal first-stop instantaneous water heater. Since there is no such thing, the explanation of the water heater structure will be omitted, and the air cooling action of the inner shells 1 and 1a and the air supply action to the burner groups 17 and 17a will be described.

First, when two water heaters (heat absorbing part 2 or 2a) are used at the same time, when the blower 10 rotates based on a command from the control device, the sucked air rises through the ventilation cylinder 7 as shown by the solid arrow, and The air hits the upper end and is divided into two parts, one from the discharge port 8 to the air supply path 6 and the other from the discharge port 8a to the air supply path 6a. That is, the air that has entered the air supply path 6 side from the discharge port 8 cools the outer wall of the inner shell 1 and descends, and then most of it is diverted from the communication part 11 to the combustion chamber 3, and a part of it flows into the combustion chamber 3. The remaining air is used to burn the gas in the burner group 17, and the other part flows along the inner wall of the inner shell 1 and is used for recooling the inner shell 1. In addition, a part of the divided flow is used as primary air to the burner group 17 to burn the gas, and together with the gas, it becomes combustion gas, rises in the combustion chamber 3 as shown by the broken line arrow, passes through the heat absorption part 2, and passes through the heat absorption part 2. After heating the water 13, it becomes waste gas and is discharged outdoors from the exhaust pipe 4. In addition, the other discharge port 8
The air that has entered the air supply path 6a from the inner shell 1
It descends while cooling the outer wall of a, and then the communication passage 11
Most of the air from a is diverted to the combustion chamber 3a, a part of which is used as secondary air to burn the gas in the burner group 17a, and the other part flows along the inner wall of the inner shell 1a and is reused in the inner shell 1a. Provided for cooling. A part of the branched flow is used as primary air to the burner group 17a to burn the gas, and together with the gas, it becomes combustion gas, which rises in the combustion chamber 3a as shown by the broken line arrow, passes through the heat absorption section 2a, and passes through the heat absorption pipe. After heating the water 13a, it becomes waste gas and is discharged outdoors from the exhaust pipe 4 together with the above-mentioned waste gas from the inner shell 1 side.

Next, when two water heaters are used individually, combustion in only one of the water heaters is stopped, so the aforementioned air cooling effect on the inner shell 1 and 1a side and the burner groups 17 and 17a are activated. The air supply operation is similar, but the only difference is that the cold air is directly sent to the exhaust pipe 4 from the water boiler on the stop side.

Figures 3 and 4 show other embodiments of the forced air-cooled instantaneous water heater of the present invention, in which the openings of the discharge ports 8 and 8a provided in the ventilation cylinder 7 and a part of the inside of the cylinder have been changed. Since this embodiment is basically the same as the embodiment shown in FIG. 2, only the changed portions will be explained.

In the embodiment shown in FIGS. 3 and 4, the ventilation cylinder 7
The areas of the openings of the discharge ports 8 and 8a provided at the upper part of the discharge ports 8 and 8a are opened with a margin without being set in advance as in the above embodiment, and the opening/closing plate 20 is placed above the discharge ports 8b and 8c. This is an example provided.
In this embodiment, for example, in the case of a gas type that requires a large amount of combustion air or, conversely, a gas type that requires little air, an amount of air suitable for combustion of the gas type is sent to the burner groups 17 and 17a. The opening/closing plate 20 can be slid arbitrarily to adjust the openings of the discharge ports 8b and 8c as shown by the imaginary lines.

Although the embodiments described above have been described as having different hot water supply capacities (combustion capacities), they may have the same hot water supply capacity. It goes without saying that the heat source may use liquid fuel other than gas. In short, the present invention is not limited to the above-described embodiments, and can be modified as desired without departing from the gist of the present invention.

As described above, according to the forced air-cooled instantaneous water heater of the present invention, a ventilation pipe is provided in the outer shell in a closed space where two inner shells each having a heat absorbing portion at the top are disposed opposite each other. The ventilation cylinder is connected to the air passages of both inner cylinders through discharge ports bored in the upper part of both side walls facing the inner cylinders, and a blower is connected to the lower side of the outer cylinder where the ventilation cylinder is provided. Since the air supply holes are exposed, the air sucked in by the blower passes through the ventilation cylinder and is diverted down from both discharge ports to both air supply passages, cooling both inner shells and supplying air to both burner groups. Therefore, compared to the conventional suction type of this type, there is no need to use a special heat-resistant configuration for the blower, and a commercially available blower can be used, and the exhaust system does not require heat-resistant means. It has been simplified from
Moreover, the effect is that the noise is low and quiet operation can be performed.

As shown in Figures 3 and 4, if an opening/closing plate is provided in the ventilation cylinder that can convert the amount of air supplied to both discharge ports, the opening/closing plate will be closed when the gas type or current rating cycle is changed, for example. By adjusting the openings of both discharge ports, the amount of air supplied to both inner shells can be arbitrarily changed, so stable combustion can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a conventional forced air-cooled instantaneous water heater, Fig. 2 is a schematic sectional view showing an example of the implementation of the forced air-cooled instantaneous water heater of the present invention, and Fig. 3 is a schematic sectional view of a conventional forced air-cooled instantaneous water heater. FIG. 4 is a partially cutaway front view similar to FIG. 2 showing an embodiment of the present invention, and FIG. 4 is a partially cutaway right side view of FIG. 1, 1a... Inner shell, 2, 2a... Heat absorption part, 3,
3a... Combustion chamber, 4... Exhaust pipe, 5... Outer shell,
6, 6a... Air supply path, 7... Ventilation cylinder, 8, 8
a,, 8b, 8c...discharge port, 9...air supply hole, 1
0...Blower, 11, 11a...Communication part, 12...
...Water supply pipe, 13, 13a... Endothermic pipe, 14... Water stop valve, 15, 15a... Hot water supply pipe, 16, 16a...
...Gas manifold, 17, 17a...Burner group, 18...Gas conduit, 19...Control valve, 20...
...Opening/closing board.

Claims (1)

[Scope of utility model registration request] Heat absorbing parts 2, 2a at the top, burner group 1 at the bottom
The burner group 17, 17 has one inner shell 1, 1a with combustion chambers 3, 3a arranged therein.
an air supply path 6, 6a that includes the air passages 6, 6a, and encloses the outer shell 5 in a sealed manner between the inner shells 1, 1a.
are formed in a predetermined portion of the lower part of the outer shell 5 where the inner shells 1 and 1a are opposed, and the upper end thereof is sealed, and a discharge is made at a position near the upper end facing the inner wall of the inner shell 1 and 1a. A ventilation cylinder 7 with outlets 8, 8a is provided, and the combustion chamber 3, the air supply path 6, and the combustion chamber 3a are provided at the lower portions of the inner shells 1, 1a.
and the air supply path 6a are communicated through communication portions 11 and 11a, respectively, and an air supply hole 9 of a blower 10 is opened in the outer body 5 at the lower part of the ventilation cylinder 7, so that the air sucked by the blower 10 is Air is passed through the ventilation pipe 7
The air is sent out into the inner shells 1, 1a by being divided into the air supply passages 6, 6a through the discharge ports 8, 8a, and dropped into the inner shells 1, 1a.
After cooling the outer wall of the combustion chamber 3 from the ventilation part 11 and the combustion chamber 3 from the communication part 11a
A forced air-cooled instantaneous water heater, characterized in that the air is supplied to the burner group 17, 17a.