JPS5835386A - Heat exchanger for recovering heat of blow water - Google Patents

Abstract

PURPOSE:To provide a heat exchanger with a lightweight, compact and highly efficient construction without inducing any problems on pressure resistance, by a method wherein a heat exchanger is constructed by disposing a star-shaped heat-exchanging body made of a sheet in a container. CONSTITUTION:The heat exchanger 1 is constructed by placing the heat-exchanging body 8 in the container, wherein the container is composed of an outer drum provided with an inlet pipe 14 and an outlet pipe 15 for feed water and end plates 13, and the heat-exchanging body 8 comprises an inlet pipe 10 and an outlet pipe 11 for blow water provided respectively at header plates 9, 9 at both ends thereof. The body 8 is produced by bending a sheet into a star shape. In using the heat exchanger 1, for example, the blow water from a boiler is passed through the interior of the body 8, while feed water is passed on the outside of the body 8. Accordingly, little pressure difference is generated between the inside and the outside of the body 8, so that no problem arises as to the pressure resistance even when the body 8 is made from a thin sheet. In addition, since a sufficiently large heat-transmitting area can be provided by bending the sheet into the star shape, a compact and highly efficient heat exchanger can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchanger for blow water heat recovery in boilers and the like.

Conventionally, shell and tube heat exchangers or coil and shell heat exchangers have been used to recover heat from blow water. Tubes were used to withstand pressure, but they had the drawbacks of being heavy and expensive.

The purpose of this invention is to obtain a lightweight and compact heat exchanger by using a thin plate for the heat transfer part. The solenoid valve is arranged between the inverse ratio valve and the boiler, and is configured to apply boiler pressure to the fluid in the container and the fluid in the star heat exchanger so that there is no pressure difference between the two. It is.

Hereinafter, embodiments of the present invention will be described based on the drawings. Reference numeral 1 denotes a blow water heat recovery heat exchanger.

They are arranged between the boiler 2 and the blow solenoid valve 3, and between the reverse IL valve 4 and the boiler 2. Reference numeral 5 denotes a blow system passage that passes from the boiler 2 to the heat exchanger 1 and the blow solenoid valve 3.

Further, 6 is a water supply line passing from the water supply pump 7 to the check valve 4, the heat exchanger 1, and the boiler 2. 08 is a heat exchanger, which is formed by bending a thin plate into a star shape, and has two ends. It is fixed to the goo plate 9 by welding. A blow water inlet pipe 10 and a blow water outlet pipe 11 are attached to the header plate 9.

The star-shaped heat exchanger 8 is housed inside a container composed of an outer shell 12 and an end plate 13. The above container has a water supply inlet pipe 1
4 and a water supply outlet pipe 15 are attached.

In this embodiment, the inside of the heat exchanger 8 is blown with water,
Although the configuration in which the water supply is provided on the outside has been described, the blow water and the water supply 5 may be reversed.

As explained above, since there is almost no pressure difference between the fluid inside the star-shaped heat exchanger and the fluid on the outer shell side (boiler pressure is applied to both), there is no problem even with a temporary heat exchanger having a low pressure resistance.

Therefore, since the plates can be bent into a star shape to provide a sufficiently large heat transfer area, a very compact and low-cost heat exchanger can be obtained.

[Brief Description of the Drawings] Figure 1 is a piping flow sheet showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing details of the heat exchanger, and FIG. 3 is a sectional view taken along the line AI in FIG. 1 Heat exchanger 2 Boiler 3 Blow solenoid valve 4 Check valve 5 Blow line 6 Water supply line 7 Water supply pump 8 Heat exchanger 9 Header plate 10 Blow water inlet pipe 11 Blow Water outlet pipe 12 is the outer body 13 is the end plate 14 is the water supply inlet pipe 15 is the water supply outlet pipe Patent applicant Miura Kogyo Co., Ltd. Representative Tamotsu Miura Figure 1

Claims (1)

[Claims] This is a blow water heat recovery heat exchanger disposed between the boiler 2 and the blow solenoid valve 3, and between the check valve 4 and the boiler 2, in which the heat exchange body 8 is formed by bending a thin plate into a star shape, Weld and fix it to the goo plate 9, and connect the blow water inlet pipe 1 to the header plate 9.
0 and a blow water outlet pipe 11 are attached, the star-shaped heat exchanger 8 is installed inside a container composed of an outer shell 12 and an end plate 13, and a water supply inlet pipe 14 and a water supply outlet pipe 15 are attached to the container.
A heat exchanger for blow water heat recovery, characterized in that it is equipped with.