JPH11325606A - Apparatus for protecting electric device mounting board for water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively protect an electric device mounting board against a radiating heat from a burner by detachably covering an upper surface of the board provided by erecting near a front surface of one side of a lower part of an apparatus with a heat shield plate for shielding the heat from the burner, thereby protecting the board by the plate. SOLUTION: An electric device mounting board A is equipped by erecting at a front surface side of one side of a lower part of a body B of the water heater, and provided to give, in addition to an operation command to a water heating function portion, a gas control command or the like at the time of blowing out or abnormal overheating. On the board A, there are provided mounting components such as a high-voltage transformer, a capacitor, a transistors, a connector and the like, and treated by potting. An upper surface of the board A is detachably covered with a heat insulating plate 8 for protecting the board A against a radiating heat from a burner 7, and held by a positioning holding means. Thus, a predetermined air gap is formed between the plate 8 and the board to form a cooling air layer, thereby enhancing a cooling effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device for an electric board in a water heater, and more particularly, to a protection device for an electric board in a water heater in which radiant heat from a burner is blocked to prevent an adverse effect on the electric board. .

[0002]

2. Description of the Related Art In recent years, thin water heaters have become the mainstream, and an electric board thereof is provided upright on the lower front side of the body near the front surface. Is installed, the radiant heat from the burner may cause the electrical board to exceed the heat resistant temperature. In order to prevent radiant heat from the burner, various types of heat shielding means are conventionally used. Generally, a heat shield plate is attached to the upper surface of the electrical board by screws to shield the heat (hereinafter referred to as Conventional Example 1). )
In addition, a tape-shaped aluminum foil is stuck on the upper surface of the electrical board to shield the heat (hereinafter referred to as Conventional Example 2).

[0003]

However, the heat shield means of the prior art 1 requires a heat shield plate and a set screw, so that the number of parts is increased, and a driver is required for attaching and detaching the heat shield plate. Since there is only a very small space because of the need for such tools, there has been a problem that it takes a lot of trouble to attach and remove the heat shield plate. Also, in the heat shielding means of the conventional example 2, the aluminum tape for heat shielding is expensive, the mounting work is troublesome, and it takes much time,
In addition, there is a problem in that a sufficient heat shielding effect cannot be obtained because the aluminum tape is merely in close contact with the electrical board.

A device for protecting an electric board in a water heater according to the present invention solves the above-mentioned problems, and makes it easy to attach / detach a heat shield plate and form an air layer for cooling, thereby effectively blocking radiant heat from a burner. It is an object of the present invention to provide an inexpensive protection device for an electric board in a container.

[0005]

According to a first aspect of the present invention, there is provided a protection device for an electric board in a water heater, which issues an operation command to a water heater function such as tapping and stopping tapping. In a water heater provided standing upright near the front side of the lower part of the body, a heat shield plate for blocking radiant heat from the burner is detachably attached to the upper surface of the electric board, and the electric board is covered with the heat shield plate. The gist is that it is protected.

According to a second aspect of the present invention, there is provided a device for protecting an electric board in a water heater, wherein an air layer for cooling is formed between the upper surface of the electric board and a heat shield plate. The gist of the present invention is that a gap is provided.

According to a third aspect of the present invention, there is provided a device for protecting an electrical board in a water heater, comprising: means for positioning and holding a heat shield plate with respect to the electrical board according to the first and second aspects. I do.

In the water heater of the first aspect of the present invention having the above-described structure, the radiant heat from the burner can be effectively blocked by merely covering the upper surface of the electrical board with a heat shield plate. As a result, the electrical board is protected by the heat shield plate, and the heat shield plate can be freely attached to and detached from the electrical board, so that the heat shield plate can be easily attached and removed without using any special tools. sell.

According to the second aspect of the present invention, there is provided a protection device for an electric board in a water heater, wherein a cooling air layer is formed between the upper surface of the electric board and the heat shield plate. As a result, the heat shielding effect of the radiant heat from the burner is increased.

According to the third aspect of the present invention, there is provided a protection device for an electric board in a water heater according to the third aspect of the present invention, wherein a heat shield plate is placed on an upper surface of the electric board, and the heat shield plate is fixed to the electric board. Is held in the position. As a result, the heat shield plate does not fall off and the gap forming the air layer does not get out of order.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the structure and operation of the present invention described above, a preferred embodiment of a device for protecting an electric board in a water heater according to the present invention will be described below with reference to the drawings. And will be described in detail.

In the drawings, reference numeral A denotes an electric board, which is provided upright on the lower front side of the body B of the water heater, and is provided with a water heater function for igniting and discharging the water heater, extinguishing the fire, and stopping the water supply. In addition to giving an operation command electrically to the controller, the controller also issues a gas control command when blowing out or abnormally overheating. For example, mounted components such as a high-voltage transformer 2, a capacitor 3, a transistor 4, and a connector 5 are mounted on a substrate 1. Equipped,
Potting treatment is applied to improve weather resistance and maintain safe operation. In this potting process, the substrate 1 is housed and arranged in the case 6 (not shown).
The substrate 1 and the case 6 are integrated through the insulating material by a process of pouring a liquid-mixed insulating material (potting resin), enclosing the substrate 1 with the insulating material, and solidifying the same.

On the upper surface of the electric board A, a heat shield plate 8 for shielding radiant heat from the burner 7 to protect the electric board is detachably attached and held by positioning and holding means D, as shown in FIGS. The heat shield plate 8 shown in FIG. 5 is a band-shaped plate having substantially the same width as the front and rear widths of the case 6 of the electric board A, and the protrusions 9a and 10a for locking are formed on the vertical pieces 9 and 10 at both ends. A stopper piece 11 is provided on the rear side to regulate and position the heat shield plate 8 in front (moving to the left in FIG. 5). Hot plate 8
On both sides of the upper surface of the case 6 of the electrical board A to be covered, the engaging projections 9a, 10a on both sides of the heat shield plate 8 are press-fitted via the upper inclined surfaces 9b, 10b. The locking recesses 12, 13 are provided with locking recesses 12, 13, and the side surfaces of the locking projections 9 a, 10 a are engaged with rear surfaces of the locking recesses 12, 13 to move the heat shield plate 8 backward (FIG. 5). Move to the right at
And stoppers 14 and 15 for restricting and positioning. 6a is a pedestal on which the substrate 1 is positioned and placed.

In the above configuration, the case 6 of the electric component board A
When the heat shield plate 8 is pushed down from above to cover the upper surface of the heat shield plate, the locking protrusions 9a, 1
Oa is press-fitted into the locking recesses 12 and 13 of the case 6 by the restoring force thereof via the inclined surfaces 9b and 10b of the case 6, and at the same time, the locking projections of the stopper piece 11 and the vertical pieces 9 and 10 are engaged. The heat shield plate 8 is positioned at a predetermined position on the upper surface of the case 6 of the electrical component board A and is fixedly attached to the upper surface of the case 6 of the electrical board A so as to restrict the movement in the front-rear direction with the portions 9a and 10a. 8 to protect the electrical board A. At this time,
Since the locking projections 9a and 10a of the heat shield plate 8 are engaged with the locking recesses 12 and 13 of the case 6 of the electrical board A, the vertical position of the heat shield 8 with respect to the electrical board A is also regulated. A constant gap a can be formed between the upper surface of the case 6 of the electrical board A and the heat shield plate 8. Therefore, a cooling air layer is formed in the gap a to enhance the cooling effect.

Next, as shown in FIG. 7, locking holes 16 and 17 formed in the vertical pieces 9 and 10 of the heat shield plate 8 are provided on both sides of the upper surface of the case 6 of the electric board A. If the structure is such that the heat shield plate 8 can be positioned back and forth, right and left, and up and down with respect to the electric board A, the electric board A
The gap a between the upper surface of the case 6 and the heat shield plate 8 can also be appropriately formed. As shown in FIG. 8, a convex portion 20 having a certain height is provided on the upper surface of the case 6 of the electric board A, and when the heat shield plate 8 is covered, the convex portion 20 causes the case of the electric board A to be covered. A gap a between the upper surface of the heat shield 6 and the heat shield plate 8 may be formed. In this case, the positioning of the heat shield plate 8 to the left and right is performed by the both-side vertical pieces 9 and 10.

When no gap is provided between the upper surface of the case 6 of the electric board A and the heat shield plate 8, for example, as shown in FIG. When the projections 21 and 22 for hooking the locking projections 9a and 10a on both sides of the hot plate 8 are provided, and the heat shield plate 8 is pushed down from above to cover the upper surface of the case 6 of the electrical board A, The locking projections 9a and 10a of the heat shield plate 8 are the inclined surfaces 9b of the case 6,
By the restoring force via 10b, it is hooked on the hooking projections 21 and 22 of the case 6, and is positioned and fixed. At this time,
The heat shield plate 8 is placed on the upper surface of the case 6 of the electrical board A and is closely covered.

As shown in FIGS. 1 to 3, the body B has a heat exchanger 24, a main burner 7, a blinker 25, an operation button 26, a thermocouple TC, an ignition rod And a water supply connection port 28, a gas connection port 29, and a tap 3 to be connected thereto.
0 and a flexible pipe 31 connected to the tap 30
A kitchen shower 32 is provided at the end of the container B, and a front cover 33 is detachably provided on the front surface of the container B, so that a thin water heater is provided as a whole. The electrical board A is provided on an upper part of a dry battery case C installed on one side of a lower part of the body B with its lower end supported.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and can be implemented in various forms without departing from the gist of the present invention. Of course. For example, the positioning and holding means for detachably attaching the heat shield plate to the upper surface of the case of the electrical board can be implemented by means other than those described in the embodiment, such as locking projections and depressions and stoppers.

[0019]

The protection device for an electric board in a water heater according to the present invention is embodied in the form described above, and has the following effects.

According to the apparatus for protecting an electric board in a water heater according to the first aspect of the present invention, the radiant heat from the burner is blocked by merely covering the upper surface of the electric board with a heat shield. Thus, the electrical component substrate is not burned or an electrical trouble does not occur. Further, since the heat shield plate can be freely attached to and detached from the electrical board, the heat shield plate can be easily attached and detached without using a special tool or the like. Therefore, the work in the mounted state as in the case of maintenance can be performed easily and conveniently.

According to the apparatus for protecting an electric board in a water heater according to a second aspect of the present invention, since a cooling air layer is formed between the upper surface of the electric board and the heat shield plate, radiant heat from the burner is formed. The heat shielding effect of the present invention increases, and the effect of the first aspect can be further enhanced.

According to the third aspect of the present invention, the apparatus for protecting the electric board in the water heater is provided only by covering the upper surface of the electric board with the heat shield plate. Since the heat shield plate is set and held at the position, the heat shield plate does not fall out unnecessarily, and the gap forming the air layer does not get out of order, and the effects of the first and second aspects can be further enhanced.

[Brief description of the drawings]

FIG. 1 is an overall front view showing an example of a water heater provided with a protection device for an electric board according to the present invention.

FIG. 2 is an elevation view thereof.

FIG. 3 is a front view of the container body with a front cover removed.

FIG. 4 is a partially cutaway front view of only an electrical board.

FIG. 5 is a side view of a part thereof.

FIG. 6 is a cross-sectional view of only a main part when no air layer is provided.

FIG. 7 is a sectional view of only a main part when different positioning and holding means are used.

FIG. 8 is a sectional view of only a main part when different positioning and holding means are used.

[Explanation of symbols]

 A: electrical board B: body 7: burner 8: heat shield plate a: air gap for air layer D: positioning and holding means of heat shield plate

Claims (3)

[Claims] 1. A water heater comprising an electric board for raising an operation command to a water heater function such as tapping and stopping of tapping, which is provided near a front surface on a lower side of a body, wherein a burner is provided on an upper surface of the electric board. A protection device for an electric board in a water heater, wherein a heat shield plate for blocking radiant heat of the electric board is detachably attached and the electric board is protected by the heat shield plate. 2. The apparatus for protecting an electrical board in a water heater according to claim 1, further comprising a gap between the upper surface of the electrical board and the heat shield plate to form a cooling air layer. 3. The protection device for an electric board in a water heater according to claim 1, further comprising means for positioning and holding the heat shield plate with respect to the electric board.