JPS6298148A - Instantaneous water heater - Google Patents

Abstract

PURPOSE:To make it possible to largely shorten the thickness dimension of an instantaneous water heater by disposing a cross flow fan so that the radial direction of rotation of the fan becomes the thickness direction of the water heater. CONSTITUTION:A vertical cylindrical body 16 whose cross sectional shape is a rectangular shape is provided, and a burner 2 is accommodated on the lower end side of the cylindrical body 16 substantially whole over the entire cross section of the cylindrical body 16. A water pipe type water heating heat exchanger 1 is provided in an upper end side opening of the cylindrical body 16 whereby the inner part of the cylindrical body 16 is used as a combustion gas fluidization route F to the water heating heat exchanger 1 from the burner 2. On the other hand, a cross flow type fan is used for the fan 3. The cross flow fan 3 is arranged in the cylindrical body 16 so that on a lower imaginary extension cylindrical part 16' of the cylindrical body 16 the substantially the entire part (including a fan case 3A) of the fan 3 is accommodated and further a fan rotation cylinder wick P is arranged along the long side direction of a rectangular cross sectional shape of the cylindrical body 16.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an instantaneous water heater, and more particularly, the present invention relates to an instantaneous water heater that houses a burner and forms a combustion gas flow path from the burner to a heat exchanger for heating water. The present invention relates to an instantaneous water heater including a cylindrical body having a flat cross-sectional shape, and a fan for forcing combustion air to the cylindrical body.

[Conventional technology]

Conventionally, in the above-mentioned instantaneous water heaters, a sirocco fan directly connected to a motor has been used as a fan for blowing combustion air, and as shown in Figure 9 (a), the burner (2) A sirocco fan (3 ) is connected to a hopper-type wind guide (18
A) or connect via Figure 10 (A),
As shown in (0), the sirocco fan (
3) The discharge ports are connected in such a way that the direction of discharge from them and the direction of ventilation with respect to the cylindrical body are orthogonal, or
As shown in Fig. 11 (a) and (b), the cylindrical body (16)
The suction port of the sirocco fan (3) is connected to the exhaust side opening of the hopper type wind for airflow convergence! (18C) (I can't provide any references). In the figure (
17) is a sirocco fan driving motor, and (22) is an exterior casing.

[Problem that the invention seeks to solve]

However, all types of instantaneous water heaters that use sirocco fans have thick walls compared to their hot water supply capacity, and
Because of their large size, instantaneous water heaters often feel like they are a nuisance when installed, and there are also inconveniences such as restrictions on where they can be installed due to space considerations.

In other words, although it is possible to change the shape of the burner and water heating heat exchanger, as well as the shape of the cylindrical body accordingly, in order to make the instantaneous water heater thinner, it is possible to relatively freely change the shape of the cylindrical body. Structure E: The installation of the sirocco fan requires a considerable amount of space in each three-dimensional direction, and the required thickness of the water heater cannot be shortened no matter which direction the sirocco fan is placed. This was an obstacle to making the device thinner.

In addition, since the discharge and suction forms of the sirocco fan are originally spot-like, it is necessary to have a large-sized air conditioning structure, such as a hopper-type wind guide or an air supply chamber, to uniformly ventilate the cylindrical body. I have no choice but to say that,
This led to an increase in the overall size of the water heater.

An object of the present invention is to make it possible to effectively shorten the required thickness of a water heater by making the overall configuration more compact by rationally improving a forced draft fan and its assembly structure. Moreover, it is possible to reduce the size of the air conditioning structure necessary for uniform ventilation without impairing the uniform ventilation of combustion air.

[Means for solving problems]

The characteristic configuration of the instantaneous water heater according to the present invention is that a cylindrical body with a flat cross section that houses a burner and forms a combustion gas flow path from the burner to a water heating heat exchanger is used for combustion. The fan for forced air ventilation is a cross-flow fan, and the cross-flow fan is arranged so that all or most of it is accommodated in the virtual extension tube of the cylindrical body, and the fan rotation axis is located within the cylindrical body. This is due to the fact that it is arranged along the long side direction of the flat cross-sectional shape, and its functions and effects are as follows.

[For production]

In other words, due to its original structure, a cross-flow fan has a large dimension in the direction of the rotation axis, but its dimension in the direction of the rotation radius is considerably smaller than that of a sirocco fan of the same capacity, and the motor also rotates in the longitudinal direction. Since it is arranged on the axis, the projected shape when viewed in the direction of the radius of rotation becomes a shape with a considerably large oblateness.

That is, by arranging the cross-flow fan so that the rotation radius direction is the thickness direction of the water heater, the thickness of the water heater can be significantly shortened.

Therefore, by setting the shape of the burner and water heating heat exchanger, the shape of the cylindrical body as seen in the direction of the cylinder axis (cross-sectional shape)
While the power is a flat shape, the cross-sectional shape of the cylindrical body,
By arranging the cylindrical body and the cross-flow fan relative to each other so that the projected shape of the cross-flow fan as viewed in the rotation radius direction overlaps as much as possible, in other words, all or most of the cross-flow fan is cylindrical. By arranging the cross-flow fan so that it fits in the virtual extension cylinder of the cylindrical body, and so that the fan rotation axis is along the long side direction (width direction of the water heater) of the flat cross-sectional shape of the cylindrical body, Although the overall shape of the main part of the water heater is a compact rectangular parallelepiped, its thickness can be significantly shortened compared to the conventional one.

On the other hand, if we look at the fan's discharge/suction form, the discharge/suction form of a sirocco fan is spot-like, whereas the discharge/suction form of a cross-flow fan is considerably longer than that of a sirocco fan. It is carried out in a line over almost the entire length in the direction of the rotation axis.

Therefore, by using a cross-flow fan as a forced ventilation fan and arranging the cross-flow fan as described above, it is also possible to create an air conditioning configuration for uniformly ventilating the cylindrical body. The suction air to the fan is directed only in the short side direction of the flat cross-sectional shape of the cylindrical body (thickness direction of the water heater), and the cylindrical body is shortened as the thickness of the water heater becomes shorter. It suffices to disperse or converge only over the short side of the body cross-sectional shape,
Compared to the case of a sirocco fan, which requires dispersion or convergence in the long side direction of the flat cross-sectional shape of the cylindrical body,
The air conditioning structure such as a hopper type wind guide can be significantly downsized and simplified, and the main structure of the water heater can thereby be further effectively downsized.

By the way, when comparing an instantaneous water heater to which the present invention is applied and a conventional instantaneous water heater using a sirocco fan with the same hot water supply capacity, the application of the present invention reduces the device volume to about 172 mm compared to the conventional one. Moreover, the thickness of the water heater could be shortened to about 172mm compared to the conventional one.

〔Effect of the invention〕

As a result of the above, the overall structure is small and compact in relation to the hot water supply capacity, and is also extremely thin, so there are fewer restrictions in terms of installation space and it is easy to freely choose the installation location, which is a huge benefit for the user. It turned into a water heater.

〔Example〕

Next, the present invention will be explained in detail.

Figure 5 shows the schematic configuration of an instantaneous water heater, which includes a water tube type water heating heat exchanger (1), a burner (2) for heating it, and a fan (3) for forcing combustion air. equipped with
The fuel gas supply pipe (4) to the burner (2) includes a safety solenoid valve (5), a gas governor (6), and a capacity switching solenoid valve (7). A water governor (9) and a water flow switch (10) are respectively installed in the water supply pipe (8) for water supply pipe (1).

A hot water supply pipe (11) from the water heating heat exchanger (1) is connected to a hot water tap (13) via an extension pipe (12).

To explain the operation of this instant water heater, the hot water tap (1
Based on the ON operation of the water flow switch (10) accompanying the opening operation of 3), the fan (3) is activated by the controller (14) and the safety solenoid valve (5) is operated to open.
And, the spark plug (15^) is activated and the burner (2)
ignites.

In addition, the water flow switch (1) is activated when the hot water tap (13) is closed.
Based on the OFF operation of the burner (0), the safety solenoid valve (5) is closed by the controller (14), and the burner (
2) is consumed and the fan (3) is stopped.

In the figure (15B) is a flame rond that detects the presence or absence of a burner combustion flame.Based on the detection result of the flame rond (15B), if a burner ignition error, extinction, or incomplete combustion occurs, a safety electromagnetic Valve (5)
will be automatically blocked.

The specific assembly structure of the water heating heat exchanger (1), burner (2), and fan (3) is shown in Figures 1 to 3.
As shown in the figure, a vertically oriented cylindrical body (16) with a rectangular cross section is provided, and a burner (2) is installed at the lower end side of the cylindrical body (16). In addition to being stored over almost the entire surface of the cylindrical body (16), the upper opening of the cylindrical body (16) is equipped with a water tube type water heating heat exchanger (1). 2) to the water heating heat exchanger (1) as the combustion gas flow path (F).

The cylindrical body (16) is divided into a burner storage part (16A) and a combustion gas flow path forming part (16B), and both parts (16A) and (16B) are integrated by flange connection.

On the other hand, a cross-flow fan is used as the fan (3), and the cross-flow fan (3) has a cylindrical body (16) with an imaginary extended cylindrical portion (16°) below the cylindrical body (16). Fan (3)
), including the fan case (3A), and the fan rotation axis (P) is aligned with the cylindrical body (16).
They are arranged along the long side direction of the rectangular cross-sectional shape.

That is, by setting the shape of the burner (2) and the water heating heat exchanger (1), the cross-sectional shape of the cylindrical body (16) is made into a rectangular shape with a large aspect ratio, and the cross-sectional shape of the cylindrical body (16) is The cylindrical body (16) and the cross-flow fan (3) are arranged relative to each other so that the projected shape of the cross-flow fan (3) when viewed in the rotational radius direction overlaps almost exactly in the vertical direction; Thereby, the heat exchanger for water heating (1)
The overall structure of the main parts of the water heater, which consists of the heater (2) and the fan (3), is compact and has a thickness (d).
The water heater is designed to have a small rectangular parallelepiped shape in order to make the overall structure of the water heater compact and thin.

In the figure, (17) is a motor for driving a cross-flow fan.

At the lower end opening of the burner storage portion (16A) in the cylindrical body (16), a hopper-shaped windshield is formed in the middle of the lower end as measured in the short side direction of the cross-sectional shape of the cylindrical body (16). A hopper-type wind guide (18) is integrally connected to the hopper-type wind guide 18), and a slit-shaped outlet of the cross-flow fan (3) is connected to a slit-shaped opening on the lower end side of the hopper-type wind guide (18).

In addition, at each of the upper end opening and the lower end opening of the hopper type wind guide (18), there are punching plates (19) for regulating the wind.
(20) is stretched over the entire surface of each opening,
Furthermore, the tongue part (3a) of the fan casing (38)
From the fan (3), the discharge air flows in the water heater thickness direction (
A guide tongue piece (21) with an inclined attitude that guides and promotes dispersion in the short side direction of the cross-sectional shape of the cylindrical body is attached to the fan casing (3A
) are connected over almost the entire length in the longitudinal direction.

In other words, the two-stage punching plates (19) and (20) sufficiently convert the dynamic pressure of the fan discharge wind into static pressure to equalize the velocity distribution of the combustion air, and the guide tongue pieces (21)
By promoting the dispersion of the fan discharge air by the action of the cylindrical body (
16) in the combustion gas flow path (F), thereby maintaining a good combustion state of the burner (2) and maintaining high heating efficiency in the water heating heat exchanger (1). That's what I do.

In addition, by applying the cross-flow fan (3), the fan discharge air is distributed only in the short side of the rectangular cross-sectional shape of the cylindrical body (16), and the two-stage punching (as described above) (19), (20) and guide tongue piece (21)
Hopper type wind! The vertical dimensions of (18) are considerably shortened,
For this reason, the main part of the water heater can be made considerably smaller.

To explain the specific structure of the burner (2) installed in the burner storage part (16A) of the cylindrical body (X6), as shown in Figs. 1, 3, and 4, it has an M-shaped cross section. A refracting plate-like member (2A) having a shape of
6A) are arranged in a row over almost the entire cross section of 1. A gas nozzle forming pipe (2B) connected to the fuel gas supply pipe (4) is installed in the recess on the upper surface side of each of the bending plate members 4' (2A) in the longitudinal direction of the bending plate member (28). It is placed in a position that follows.

The refracting plate member (2A) has an air jet port (a) for jetting combustion air toward the gas nozzle forming pipe (2B), and the gas nozzle forming pipe (2B) has a refractive plate. A gas outlet (g) that injects fuel gas toward the inclined inner surface of the upper surface side recess in the shaped member (2A) is connected to the air outlet (a) in the longitudinal direction of the bending plate member (2A). (g) and are arranged alternately.

In other words, the above-mentioned alternating arrangement allows combustion air to be ejected, and
As the fuel gas is ejected, adjacent air ejection ports (a
) and the gas outlet (g) to generate a swirling flow, thereby increasing the mixing effect of the jetted combustion air and the jetted fuel gas and improving combustion performance. .

In FIGS. 1 and 2, (22) is the water heater exterior casing, and the exterior casing (22) also has a thin rectangular parallelepiped shape to support the compactness and thinness of the main part of the water heater.

In the figure, (23) is a water supply joint, (24) is a hot water supply joint, (
25) is a gas joint, and the outer casing (22)
) has an exhaust port (26) communicating with the upper end opening of the cylindrical body (16), and an air intake port (26) communicating with the suction port of the cross-flow fan (3) at the lower front of the exterior casing (22). mouth(
27) are formed respectively.

Further, (28) in the figure is a metal fitting for mounting a water heater.

[Another example]

Next, another embodiment of the present invention will be described.

As shown in Fig. 6 (a) and (2)), the cylindrical body (16)
A cross-flow fan (3) is placed on the exhaust side of the
3) The cylindrical body (16) is
Combustion air may be forced through the air.

Note that the symbols given in FIGS. 6(a) and (2)) correspond to the symbols used in the above-mentioned embodiments, and the same symbols are used for components having the same functions as those explained in the above-mentioned embodiments. It is attached.

The specific cross-sectional shape of the cylindrical body (16) is a rectangular shape, a rectangular shape with rounded corners, an elliptical shape, etc.
Various changes are possible, and in short, any flat cross-sectional shape is sufficient.

The mounting direction of the cylindrical body (16) may be such as, for example, as shown in FIG. i! as appropriate depending on the installation format. ! Just translate it.

Taking advantage of the fact that the overall structure of the water heater can be made smaller and thinner, for example, as shown in Fig. 8, a unit appliance can be constructed in which a gas stove (29) and a water heater (A) are combined. , it is possible to integrate the water heater into various appliances or to install it as a built-in device.

Various improvements can be made to the ancillary structures of the instantaneous water heater, such as the fuel supply structure for the burner (2) and the water supply structure for the water heating heat exchanger (1).

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention, in which FIG. 1 is a side sectional view, FIG. 2 is a front sectional view, FIG. 3 is a sectional view taken along line mm in FIG. 1, and FIG. Figure 4 is an enlarged sectional view showing the burner configuration, and Figure 5 is a schematic diagram of the water heater. 6 to 8 respectively show other embodiments of the present invention, FIGS. 6(a) and 6(0) are a front sectional view and a side sectional view, and FIG. 7 is a part showing a sideways installation mode. Broken perspective view, No. 8
The figure is a perspective view showing the unit appliance. Figure 9 (a), (b), Figure 10 (a), (b), and Figure 11 (a), (to)) respectively show the conventional structure, and each figure (a) is a front view. The sectional views and each figure U are side sectional views. (1)...Heat exchanger for water heating, (2)...
... Burner, (3) ... Fan, (16) ...
...Cylindrical body, (16') ...Virtual extension cylinder part, (F) ...Combustion gas flow path, (P) ...
...Fan rotation axis.

Claims (1)

[Claims] A cylindrical body (16) with a flat cross-sectional shape is provided to house the burner (2) and form a combustion gas flow path (F) from the burner (2) to the water heating heat exchanger (1). , an instantaneous water heater provided with a fan (3) for forcing combustion air to the cylindrical body (16), the fan (3)
is made into a cross-flow fan, and the cross-flow fan (3) is arranged such that all or most of it is accommodated in the virtual extension tube part (16') of the cylindrical body (16), and the fan rotation axis ( P
) is arranged along the long side direction of the flat cross-sectional shape of the cylindrical body (16).