JP2576274Y2 - Exhaust top of outdoor water heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust top of an outdoor water heater.

[0002]

2. Description of the Related Art In a water heater of an outdoor installation type, damage of a burner due to rain water coming into contact with a high-temperature burner due to rain water intrusion from an exhaust top, and malfunction due to rain water coming into contact with a frame rod, an igniter or the like. However, since the heat exchanger is likely to be damaged due to rapid cooling due to rainwater, the exhaust passage is conventionally complicatedly bent by using a partition plate, etc. In general, it prevents intrusion.

For this reason, the exhaust passage resistance in the exhaust chamber becomes large, and the fan speed must be increased when performing high load combustion. Therefore, in order to prevent rainwater from invading, a sacrifice such as fan noise has to be made. In other words, it was impossible to satisfy both of the ideal conditions of the top exhaust, that is, "prevention of rainwater intrusion" and "do not increase the exhaust passage resistance".

Therefore, as a measure to prevent rainwater intrusion, for example, a water catching net for catching intrusion water droplets from an exhaust port is provided in an exhaust path (see Japanese Utility Model Application Laid-Open No. Sho 63-163).
No. 196051 and Japanese Utility Model Laid-Open No. 64-28750), or a net material provided on a water drop receiving plate provided at a lower end portion of an exhaust port with a predetermined space therebetween (Japanese Utility Model Laid-Open No. 63-66).
No. 752) has been proposed.

[0005]

In the prior art provided with a water catching net, in order to sufficiently prevent rainwater from entering, it is necessary to make the opening area of the net small enough. As a result, the exhaust passage resistance increases.

[0006] Since a normal wire mesh or the like is used as the water catching net, and the net is merely stretched or bent in a plane, rainwater attached to the net is not immediately guided downward, and is always drawn. Since it is impossible to catch new rainwater, a so-called saturated state is obtained, and the water-capturing ability is reduced, and there is a possibility that rainwater may still enter the inside.

[0007] In the case where the net material is provided on the water droplet receiving plate, the speed of the rainwater impinging on the receiving plate by the net material is merely suppressed.

[0008] This invention is the aim of solving the above problems possessed by the prior art, by attaching with a constant climb inclination swash the mesh member of a special structure on the outlet side of the exhaust chamber, an exhaust passage resistance of the exhaust chamber The purpose of the present invention is to provide an exhaust top in an outdoor water heater that reliably prevents rainwater from entering without increasing the size.

[0009]

In order to achieve the above object, an exhaust top of an outdoor water heater according to claim 1 of the present invention is, for example, as shown in the drawings corresponding to the embodiments. On the outlet side of the exhaust chamber 2 provided on the downstream side of the heat exchanger 1, a rhombic lattice in which the intersections 3 b of the mesh 3 a are alternately displaced up and down so that adjacent intersections 3 b are vertically overlapped a. Of the mesh body 3 formed at the intersection of the vertically adjacent
3b is later θ angle projection aperture area ing at least zero from the outlet side to always polymerizing a relative penetration direction b rainwater
Is summarized in that the installed to be inclined towards.

In addition, the outdoor installation type power supply according to claim 2 of the present invention.
The exhaust top of the water heater is provided by connecting the mesh body 3 of claim 1 to the exhaust chamber 2.
Is provided on the outlet side from the minimum passage area 4 of
Make the mouth area larger than the opening area of the minimum passage area 4
The gist is that you have done.

[0011]

The outdoor installation according to claim 1 of the present invention having the above configuration.
The rain water that enters the exhaust top of the stationary water heater from the outlet side of the exhaust chamber 2 is such that the mesh body 3 alternately moves up and down the intersections 3b of the meshes 3a, and the adjacent intersections 3b enter the rain water. Since it is formed in a rhombic lattice that always overlaps with the direction b, the rainwater that collides with the net 3 suddenly changes its invasion direction and cannot follow the flow, and the partition wall 3c of the mesh 3a
And is immediately guided down the partition wall 3c or falls as it is.

The mesh body 3 has an angle θ on the outlet side of the exhaust chamber 2 at which the projected opening area from the outlet side is at least zero.
The mesh 3 of the mesh body 3
The actual opening area according to a is greatly different from the projected opening area from the outlet side, and the water catching capacity is improved while the actual opening area is sufficiently secured.

According to a second aspect of the present invention having the above structure,
The exhaust top of the externally installed water heater has a net 3 provided on the outlet side of the minimum passage area 4 of the exhaust chamber 2, and an opening of the net 3.
The area was made larger than the opening area of the minimum passage area 4 described above.
Since, been made to the before the water catching invasion rainwater minimum passage area part 4 Sumiya, rain water from entering the exhaust chamber inside is effectively prevented, and the exhaust gas is actually due mesh 3a of the mesh member 3 the opening area of the secured, moreover, to pass mesh 3a of the mesh member 3 smoothly the flow is also not gently bent rectifying be bent largely by mesh 3a,
The exhaust passage resistance does not increase.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an exhaust top of an outdoor water heater according to the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a heat exchanger which is installed above a combustion chamber, and is a fin-and-tube type heat exchanger in the embodiment.

Reference numeral 2 denotes an exhaust chamber provided on the downstream side of the heat exchanger 1. An exhaust port 6 is opened laterally on one side of the exhaust chamber, and the exhaust gas flowing through the heat exchanger 1 and reaching the exhaust chamber 2 is discharged. Exhaust port 6 on one side
From the outside of the vessel.

Numeral 3 denotes a mesh body. For example, in FIG. 5, a wave is formed at the intersection 3b of the mesh 3a in an upward, downward, upper, lower, and upper direction, and the intersection 3b alternates up and down. And the adjacent intersection 3b is formed in a wavy rhombic lattice that always overlaps in the vertical direction with respect to the rainwater intrusion direction b.

The reason why the net 3 is configured as described above is that, when gas (exhaust gas) and liquid (infiltrating rainwater) are compared, gas has no surface tension while liquid has surface tension. When it hits a wall, it tries to stick to it. Further, since the liquid has a much larger inertial force than the gas, it cannot follow the flow when the flow path changes (when the flow direction changes). In addition, liquids have a much higher density than gases, so they experience high resistance in certain flows,
It falls down due to gravity. Taking into account the differences between the two, the purpose is to achieve the intended purposes of "preventing rainwater intrusion" and "do not raise the height of the exhaust passage pile".

It is preferable to use a commercially available lath wire net (hereinafter simply referred to as a lath net) for the net 3. That is,
Lath is put inclusive Ri multiple switching to form a network of diamond-shaped lattice in the plane plate of uniform thickness, those formed by stretching a flat faceplate laterally, meets the configuration. However, it is a matter of course that the present invention is not limited to the lath net.

The net body 3 has a smaller projected opening area from the outlet side on the outlet side than the minimum passage area 4 of the exhaust chamber 2.
Both are mounted disposed inclined rearwardly at an angle θ such that zero, the intersection of the portion 3 adjacent to each mesh 3a of the net-body 3
b always polymerizes in the direction of rainwater intrusion and at the intersection
Portion 3b acts as a so-called steam-water separator. Although one net 3 is installed in the embodiment, a plurality of nets may be installed in consideration of exhaust resistance.

The minimum passage area 4 of the exhaust chamber 2 is shown in FIG.
In the embodiment of FIG. 3 and the top of the exhaust chamber 2 are formed between the front end of the rain return plate 8 and the top of the exhaust chamber 2, and in the embodiment of FIGS. It is formed between the chamber 2 and the top plate.

The lower exhaust guide plate 5 guides exhaust gas to an exhaust port 6 and guides intrusion rainwater to an outlet (not shown).
It is appropriately determined from the height and the like, and the shape is not particularly determined. 5a
Denotes an upper exhaust guide plate.

[0023] The rain flashing plate 8 provided in the connection portion of the exhaust guide plate 5 and the netting 3, but the embodiment of FIGS. 1 and 2 is provided obliquely rearward to the same angle as the netting 3 In the embodiment shown in FIG. 3, it is provided upright at an angle larger than that of the net 3. The embodiment of FIG. 4 does not include the rain return plate 8.

The operation of the above configuration will be specifically described based on the illustrated embodiment.

When the rainwater that has entered through the exhaust port 6 due to heavy horizontal rain directly collides with the net 3 (see FIG. 1A),
The portion of the intersection of adjacent meshes 3a of the mesh body 3, ie,
The steam separator plate 3b is vertically overlapped with the rainwater intrusion direction b, and the net body 3 is installed to be inclined backward at an angle θ at which the projected opening area from the outlet side is at least zero. The infiltrating rainwater is
b, the flow is sharply bent upward, and the rainwater cannot follow the flow and adheres and is trapped after the collision.
It is guided downward along the partition wall 3c of a or falls as it is (see arrow d in FIG. 5 and arrow c in FIG. 6).

That is, since the mesh 3 is formed in a wavy rhombic lattice, the mesh 3a always extends obliquely rearward with respect to the rainwater intrusion direction b, and intersects the mesh 3a one step behind. Furthermore, it continues downward. In other words, since there is a rainwater moving passage and guides the water downward, most of the rainwater is guided downward along the partition wall 3c of the mesh 3a.
As a result, rainwater does not reach the exhaust guide plate 5 and remains on the net 3.

Then, since the infiltrating rainwater collides with the net body 3 and sharply changes its direction, a portion of the intersection with respect to the invading direction is formed .
Since polymerization a minute 3a may be less, the exhaust passage area of the mesh member 3 can not be smaller than necessary.

Therefore, the exhaust gas from the minimum passage area portion 4 is not bent greatly by the mesh 3a but is gently bent and straightened, and smoothly passes through the mesh 3a of the mesh body 3. As a result, since the exhaust gas is discharged from the exhaust port 6, the exhaust gas passage resistance is suppressed to substantially the same level as in a state without a net and does not increase.

Next, when rainwater enters the exhaust port 6 from a diagonal upper portion at a steep angle and collides with a relatively outlet side of the exhaust guide plate 5 (see FIG. 1B), it collides with the exhaust guide plate 5 and rebounds. The kinetic energy of the rainwater sharply decreases by colliding with the net 3. Therefore, the amount of rainwater scattered through the mesh body 3 to the rear of the exhaust chamber is extremely small.

Further, when rainwater enters the exhaust port 6 from a diagonal upper direction at a gentle angle and collides with a relatively deep side of the exhaust guide plate 5 (see FIG. 1C), the rainwater collides with the exhaust guide plate 5 and rebounds. Does not enter the exhaust chamber by hitting the rain return plate 8, but is guided to the outlet along the exhaust guide plate 5 and is discharged.

When the rain return plate is not provided as in the embodiment shown in FIG. 4, it is only possible to cope with the case of the infiltration of the rainwater shown in FIGS. Although rainwater intrusion is actually an extremely rare phenomenon, there is no practical problem without a rain return plate.

Here, since the exhaust gas is discharged through each of the meshes 3a of the rhombic lattice of the mesh 3 formed in the corrugated rhombic lattice (see the arrow e in FIG. 6), the opening area of the mesh 3 (area × number mesh per one mesh), so that larger than a minimum passage area 4 of the exhaust passage Kuna', the increase in passage resistance of the exhaust Ena physician affect the combustion state.

That is, the exhaust passage resistance when the mesh body (for example, a lath net) formed in a corrugated rhombic lattice having an aperture ratio of 65% (1.4 times the minimum passage area) is attached and not attached is determined. It is clear from the passage resistance curve of FIG. 7 measured during non-combustion (at the time of blowing by a fan) that the influence is little .

A net 3 formed in a corrugated rhombic lattice
Is the area per mesh and the number of meshes (that is, the number of divisions)
The best mesh may be selected appropriately according to the volume (exhaust cross-sectional area) of the exhaust chamber 2 and the capacity of the water heater, and the number of meshes is not particularly determined.

[0035]

According to the exhaust top of the outdoor water heater according to the first aspect of the present invention, the weight is always heavy in the rainwater intrusion direction.
Since the netting was formed on diamond grid <br/> having a phase adjacent intersections for coupling mounted is tilted rearward, as compared to the conventional exhaust top, rainwater intrusion Ru can be reliably prevented. Accordingly
Te, for example, burner according rainwater penetration, damage to the heat exchanger or the like, the flame rod, a problem such as a malfunction such as an igniter is eliminated, In addition, since there is no need of increasing the fan speed due to the increase in the exhaust passage resistance, the noise of the fan motor
Low-Ku can be suppressed, noise is also significantly reduced.

The outdoor installation type supply according to the second aspect of the present invention.
According to the exhaust top of the water heater , the mesh body is provided on the outlet side from the minimum passage area of the exhaust chamber, so that infiltration rainwater is captured immediately before the minimum passage area , and the mesh body Opening of
The mouth area is larger than the opening area of the minimum passage area
Exhaust gas in the exhaust chamber
Airflow resistance does not increase. Therefore, burner combustion is hindered.
There is no harm at all.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of an exhaust top of an outdoor water heater according to the present invention.

FIG. 2 is a schematic sectional view of an embodiment using a different exhaust guide plate.

FIG. 3 is a schematic cross-sectional view of an embodiment using different rain return plates.

FIG. 4 is a schematic sectional view of an embodiment in which a rain return plate is omitted.

FIG. 5 is an enlarged plan view showing a part of the mesh body in an attached state.

FIG. 6 is an enlarged cross-sectional view showing a part of the mesh body in an attached state.

FIG. 7 is a curve obtained by measuring a passing pile with and without a net.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Exhaust chamber 3 Netting 4 Minimum passage area 3a Mesh 3b Intersection part a Polymerization part b Rainwater intrusion direction

Claims (2)

(57) [Scope of request for utility model registration] 1. An intersection (3b) of a mesh (3a) is provided at an outlet side of an exhaust chamber (2) provided downstream of a heat exchanger (1).
(3b) at the intersections adjacent to each other by alternately displacing
Are formed on a rhombic lattice (3), which is superimposed vertically (a) .
After the angle projected opening area of the outlet side always polymerizing (a) with respect to the direction of approach (b) is ing at least zero (theta)
Top exhaust outdoor installation type water heater, characterized in that installed in an inclined towards. 2. The net (3) is provided on the outlet side from the minimum passage area (4) of the exhaust chamber (2), and the net (3) is opened.
The mouth area is larger than the opening area of the minimum passage area (4).
Top exhaust outdoor installation type water heater according to claim 1, characterized in that listen.