JPS592437Y2 - hot water boiler - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hot water boiler, and its purpose is to improve heat exchange efficiency and hot water supply characteristics.

In conventional hot water boilers, the water supply pipes and hot water supply pipes are installed on the side of the hot water boiler, so when doing external work using elbows or union joints for piping, these parts and piping are placed on the side of the boiler rather than the main body. As a result, there were drawbacks such as the need for a larger installation space for the boiler.

Therefore, as a separate body that does not take up installation space, water supply pipes,
There has come to be a demand for a separate body in which the hot water supply pipe is provided above the top of the separate body.

The present invention was developed based on this background.

Examples of the present invention will be described below.

In Fig. 1, 1 is an outer shell, and an inner shell 2 and a hot water storage tank 3.
Configure.

The inner and outer shells 2 and 1 constitute a separate body. The upper part of the inner shell 2 is expanded in the radial direction to form a tapered expanded tube portion 4, and furthermore, the inner shell 2 has a plurality of ribs 5 formed on its circumferential surface.

One end of a water supply pipe 6 and a hot water supply pipe 7 are connected to the expanded pipe portion 4 of the inner shell 2 so as to communicate with the inside of the hot water storage tank 3 .

A drain port 8 is formed in the lower part of the outer shell 1 so as to communicate with the inside of the hot water storage tank 3. Further, a portion of the outer shell 1 corresponding to the combustion chamber 9 in the inner shell 2 is provided with an overheat prevention device 10. Further, in the outer body 1 part above the device 10, there is a thermistor 11 as a hot water temperature detection element for controlling the temperature of water in the hot water storage tank 3, and a separate body whose inner surface is treated with glass lining, for example. Galvanic corrosion protection electrode 12 for protection against detachment in some cases is attached.

Reference numeral 13 denotes a baffle support, which is provided on the inner shell 2 and supports the baffle top 14.

The upper end of a baffle support rod 17 is attached to the baffle top 14, and a plurality of baffle plates 15 are attached to this support rod 17 via baffle spacers 16.

This baffle plate 15 promotes heat exchange on the heat transfer surface of the inner shell 2.

The lowermost baffle plate 15 and the inner shell 2 form the aforementioned combustion chamber 9, in which a flame 18 is formed by, for example, a gun-type burner (not shown) attached to the burner insertion portion 19.

20 is a base, on which a firebox brick 21 is fixed, and below the base 20, a heat shield plate 22 is fastened with screws.

A heat insulating material 23 is disposed above the baffle top 14 to prevent heat exchange in the upper part of the inner shell 2.

Combustion gas is guided from the top 25 to a chimney (not shown) through an exhaust pipe 24 made of punched metal, lath mesh, or the like.

A heat insulating material 27, for example glass wool, is interposed between the outer shell 1 and the outer case 26.

Next, the structure of the water supply pipe 6 and the hot water supply pipe 7 to be attached to the body will be described in detail.

In FIGS. 2 to 5, for example, the water supply pipe 6 is welded to the tapered expanded pipe portion 4 of the inner shell 2 by cutting its lower end into a tapered shape. In the vicinity of the connecting part with the water supply pipe 6, a stepped part 6a is formed, and its cross-sectional opening shape is flat so as to widen at an angle θ toward the lower end of the water supply pipe 6 in the circumferential direction of the housing, as shown in FIG. Specifically, it has a substantially semicircular shape.

Further, as described above, the stepped portion 6a of the water supply pipe 6 has its lower end surface 6b cut into a tapered shape, and the shape of this lower end surface 6b is the same as the communication hole 4a formed in the expanded pipe portion 4. , and the peripheral edge of the communication hole 4a and the lower end surface 6b are the welded part A.
are liquid-tightly connected.

Further, the water supply pipe 6 is guided upward so that its upper end side does not protrude laterally beyond the outer shell 1.

B indicates a welded part.

The shape and size of the stepped part 6a depend on the thickness of the hot water tank 3, which is determined by the maximum diameter of the outer shell 1 and the minimum diameter of the inner shell 2. If this thickness is made thinner, the thickness of the stepped part 6a will be reduced. It also needs to be made thinner so that it is flatter.

Further, the water supply pipe 6 is coupled to the expanded tube part 4 so that the stepped part expands in the circumferential direction of the adult body.

Note that the hot water supply pipe 7 also has the same shape as the water supply pipe 6, and is attached to the upper part of the body with the same structure, so a description of this structure will be omitted.

Next, the functions and effects of the above configuration will be described.

Water entering from the water supply pipe 6 is guided into the hot water storage tank 3 between the inner and outer shells 2 and 1, becomes hot water by the combustion heat of the burner, and can be discharged from the hot water supply pipe 7.

Here, as shown in FIGS. 2 to 5, the water supply pipe 6 forms a stepped part 6a, and thereby has a flat shape that widens at an angle θ in the circumferential direction of the case toward the lower end of the water supply pipe 6. As shown in Fig. 6A, the water that entered the hot water storage tank 3 from the water supply pipe 6 in the direction of the arrow a is directed downward while forming a flux that extends in the circumferential direction of the adult body. move it.

Therefore, this water comes into contact with the wide heat exchange surface of the inner shell 2 within the adult body, increasing the heat exchange efficiency.

In contrast, since conventional pipes were simply cylindrical pipes that did not spread downward, water moved downward while forming a flux that did not spread, as shown by the mouth. It contacted only the narrow heat exchange surface of the shell 2, resulting in low heat exchange efficiency.

In addition, in this example, when the stepped part 6a is formed, the flow path becomes narrower, so the flow rate of water becomes faster and the water spreads more widely in the direction of the circumferential surface of the adult. However, if the water supply pipe 6 is shaped so that it widens at an angle θ in the circumferential direction of the housing as it goes toward its lower end, the water flow velocity will be slower, but it will still be wider than the conventional flow velocity at the mouth, and the heat exchange efficiency will be high. It is.

Furthermore, if the water spreads as in this embodiment, even if there is no thermistor 11 directly below the water supply pipe 6, the thermistor 11 can quickly detect the water, and as shown in FIG. In this case, when the hot water supply temperature does not drop significantly, the burner is started to operate and the hot water temperature is increased.

On the other hand, if the opening does not have a wide opening like the opening in Figure 6, the thermistor 11 will detect cold water only after a period of time during which the hot water temperature has significantly decreased, as shown in the opening in Figure 7. Therefore, lukewarm hot water will come out.

On the other hand, in the hot water supply pipe 7, due to the presence of the stepped part, the influence of the convection of hot water in the upper part of the body is difficult to reach the inside of the hot water supply pipe 7, and therefore, the temperature of the hot water in the hot water supply pipe 7 does not become so high.
It is extremely safe, as hot water of nearly 100°C does not suddenly come out at the beginning of hot water supply.

As described above, the hot water boiler of the present invention is provided with a water supply pipe having a cross-sectional opening shape that widens in the circumferential direction of the housing toward the lower end, and this water supply pipe is connected to the upper part of the housing so as to communicate with the hot water storage tank. Therefore, the water flowing into the adult body from this water supply pipe can be spread in the circumferential direction of the container and brought into contact with the large heat exchange surface of the adult body, and as a result, the heat exchange efficiency can be improved. Moreover, since the water supply pipe is simply widened, the cost can be reduced compared to the method in which a baffle body is provided to spread the water.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hot water boiler according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the structure near the water supply pipe.
Figure 3 is an external perspective view showing the state before the water supply pipe is installed, Figure 4 is a top view of the pipe, Figure 5 is a sectional view taken along the line x-x' in Figure 2, and Figure 6 is the same water supply pipe. FIG. 7 is a diagram showing the flux of water supplied from the pipe, and is a diagram showing the relationship between the temperature of hot water supplied from the hot water supply pipe and the hot water supply time. 1...Outer body, 2...Inner body, 3...
...Hot water tank, 6...Water supply pipe, 6a...
Step push part.

Claims (1)

[Scope of utility model registration request] A hot water boiler is provided with a water supply pipe having a cross-sectional opening shape that widens in the circumferential direction of the separation body toward the lower end, and this water supply pipe is connected to the upper part of the separation body so that its lower end communicates with a hot water storage tank.