JPS5931673B2 - Hot water generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water generator that generates hot water by exchanging heat with a fluid such as water using a heat medium such as a steam boiler or a hot water boiler.

Conventionally, this type of heat exchanger-type hot water generator consists of a double sealed inner and outer tube, with cold water passing through the inner tube and steam flowing between the inner and outer tubes to exchange heat due to the difference in fluid temperature between the two tubes. Attempts have been made to heat cold water and discharge it as hot water, but in this conventional double-pipe structure, the inner and outer pipes are arranged concentrically, so that the gap between the inner and outer pipes is equal in the longitudinal direction. However, although the total length of the pipe is 1 to 2 m, the gap between the inner and outer pipes is very small at 1 to 3 m due to operational and manufacturing constraints, and the condensate that becomes condensed water is If this happens, the condensate water level between the inner and outer tubes will rise and the heat transfer area will be destroyed, making it impossible to use the heat transfer area effectively, resulting in a reduction in heat exchange efficiency.

In addition, as shown in Fig. 1, in a structure in which the inner cylinder 2 is eccentrically installed in the outer cylinder 1 with the axis thereof being semi-aligned, and is inscribed in such a way that they are in contact with each other in a straight line, heat transfer is This had the disadvantage that condensate water was hindered and the drainage of condensate was poor.

The present invention aims to accurately eliminate these conventional drawbacks, and provides a hot water generator or heat exchanger with a simple and inexpensive construction that allows for good drainage of condensate and effective use of heat transfer area. It is intended to provide.

Another object of the present invention is to generate hot water in a form that can suppress the rise of the condensate water level accumulated between the inner and outer cylinders of a double cylinder body for heat exchange due to capillarity and greatly improve the heat transfer rate. It is about using it as a vessel.

The present invention provides hot water generation, etc., made of a double cylinder body of an inner cylinder and an outer cylinder, which transfers heat between fluids having a temperature difference flowing inside and outside the heat transfer cylinder body, and draws out a fluid at a predetermined temperature. In the container, the outer surface of the inner cylinder and the inner surface of the outer cylinder are formed of a cylindrical surface with few irregularities, and are arranged so as to cross the central axis of the outer cylinder, which aligns the central axis of the inner cylinder. This is a hot water generator featuring:

Here, the term "cross" refers to a state in which the two axes do not actually intersect three-dimensionally, but rather are arranged in a non-parallel state and intersect in a projected view.

An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, a hollow inner cylinder 2 serving as a heat transfer tube is placed inside a sealed hollow outer cylinder 1, and its center axis is relative to the center axis of the outer cylinder 1. A steam outlet 11 and a condensate outlet are provided in the outer cylinder 1 so that a fluid having a temperature difference between the inside and outside of the inner cylinder 2, such as high-pressure steam and cold water, can flow inside the outer cylinder 1 so as to be arranged in a cross manner. 12,
In addition, the inner cylinder 2 is provided with a cold water outlet 21 and a hot water outlet 22 in communication with each other.

In this way, the gap 4 between the inner and outer cylinders becomes a steam chamber, one end or both ends of the outer cylinder 1 are sealed with the end plate 5, and both ends of the inner cylinder 2 are also sealed with the end plates 6, 7. It is.

In this case, the lower end of the outer cylinder 1 is sealed with a spacer or a welded part 8 without a spacer in relation to the inner cylinder 2, and one end of the inner and outer cylinders is used together with the end plate 7 of the inner cylinder 2, but there are separate ends. It is also possible to seal each cylinder independently with a plate.

The condensate outlet 12 provided in the outer cylinder 1 is provided on the side opposite to the contact part 3 where the inner and outer cylinders come into close contact with each other, and communicates with the gap 4 for good drainage of condensate. 3, the inner cylinder 2 is crossed with the outer cylinder 1, that is, the inner cylinder 2 is brought into contact with the upper end and the lower end, and is held in contact with the outer cylinder 1 so that the gap 4 gradually decreases and increases in the vertical direction. 3 can also be attached closely with adhesive means that also allows thermal expansion, if necessary.

If the inner cylinder 2 is crossed with the outer cylinder 1 as shown in the example in Fig. 2, and a gap is formed in the close contact area, the condensate water level can be significantly lowered, and it is useful for promoting the guidance of condensate. This results in good drainage of condensate and effective use of the heat transfer area, resulting in an effect of improving the heat transfer rate by 133 times compared to the example shown in FIG.

Note that it is considered that a guide pipe 20 serving as an overflow pipe is provided inside the inner cylinder 2 and connected to the hot water outlet 22 to change the flow direction of the flowing fluid.
A guide pipe 2 is installed on the cold water population 21 side in relation to the cold water population 21 and hot water outlet 22 and the steam population 11 and condensate outlet 12.
0 can also be concatenated.

Further, as shown in FIGS. 3 to 5, it is preferable that a plurality of the outer cylinders 1 are arranged in parallel and adjacent to each other, and the inlets and outlets of each fluid are communicated with each other through a header to form a hot water generator or a heat exchanger of a predetermined capacity.

9 in the figure indicates the condensate water level.

10 is a steam header, 13 is a condensate header, 14 is a water supply header, and 15 is a hot water header.

In the example shown in FIG. 6, the condensate outlet 12 is opened in the lower end plate 7' of the outer cylinder 1, and the cold water outlet 21 and the hot water outlet 22 are opened in the upper end plate 7' of the inner cylinder 2.
In this example, a steam port 11 is formed on the upper wall of the outer cylinder 1, and a guide pipe 20 is connected to a cold water port 21.

In both examples, the flow direction of the two fluids may be parallel flow in which the two fluids flow in the same direction in a half line, counterflow flow in parallel and opposite directions, or cross flow flow in the directions perpendicular to each other. The steam port 11 to which high-pressure steam is supplied is located on the upper side, and the condensate outlet 1 is located on the upper side.
It is effective to provide 2 on the side opposite to the lower contact point.

When high-pressure steam is supplied from the steam port 11 into the outer cylinder 1, and cold water is introduced into the inner cylinder 2 from the cold water port 21, heat is exchanged between the two fluids through the inner cylinder 2, which serves as a heat transfer tube. Afterwards, the cold water becomes hot water and is led out of the system from the hot water outlet 22.

On the other hand, the steam supplied into the outer cylinder 1 turns into condensate, is guided into the gap 4 between the inner and outer cylinders, flows down, and is efficiently led out from the condensate outlet, making it possible to efficiently produce hot water.

The present invention improves the drainage of condensate significantly, suppresses the rise in the condensate water level due to capillary phenomenon, enables effective use of the heat transfer area, greatly improves the heat transfer rate, and improves the flow of hot water or gas. In addition to being able to operate efficiently and safely as a generating device, it also contributes to energy conservation, making the sealed cylinder part easy to manufacture and extremely inexpensive, and offering the advantage of greatly reducing construction materials and processing costs. .

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the conventional example, Fig. 2 is a longitudinal sectional view of the embodiment of the present invention, Fig. 3 is a longitudinal sectional view of its usage state, Fig. 4 is a side view, and Fig. 5 is a plan view. , FIG. 6 is a longitudinal sectional view of still another embodiment. 1...Outer cylinder, 2...Inner cylinder, 3...Contact part, 4...
・Gap, 5.6, 7... End plate, 5'... Lower end plate, 7
t...Top end plate, 8...Welding part, 9...Condensate water level,
10...Steam header, 11...Steam inlet, 12...
・Condensate outlet, 13... Condensate header, 14... Water supply header, 15.0 hot water header, 20... Guide pipe,
21... Cold water inlet, 22... Hot water outlet.

Claims (1)

[Claims] 1. In a hot water generator consisting of a double cylinder of an inner cylinder and an outer cylinder, which transfers heat between fluids with a temperature difference flowing inside and outside the heat transfer cylinder and derives a fluid at the desired temperature, The outer surface of the inner cylinder and the inner surface of the outer cylinder are formed of a cylindrical surface with few irregularities, and are arranged so that the central axis of the inner cylinder crosses the central axis of the outer cylinder. Generator for hot water, etc.