JPS5937579Y2 - Heat exchanger - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a heat exchanger.

More specifically, it relates to a countercurrent double-tube heat exchanger, whose main purpose is to turbulently flow the fluid flowing inside the outer tube to reduce membrane resistance, thereby effectively transferring heat and increasing the flow between the outer and inner tubes. An object of the present invention is to provide a heat exchanger that can be easily cleaned.

Hereinafter, the present invention will be described in detail based on an example. In FIG. 1, 1 is an inlet side header to which a first fluid is supplied;
3 is the outer pipe, 4 is the outlet side bottom where the first fluid is discharged.
5 is a spiral finned inner tube, and 5 is a second fluid at a different temperature from the first fluid.
An inlet header to which fluid is supplied; 6 an outlet header to which the second fluid is discharged; 7 an inlet header 1;
and a body welded to the outlet side header 2.

The outer tube 3 has one end opened and welded to the inlet header 1, and the other end opened and welded to the outlet header 2.

The spiral finned inner tube 4 is arranged in the outer tube 3 with one end passing through the inlet header 1 and the other end passing through the outlet header 2.

Note that one end passing through the inlet header 1 is opened in the outlet header 6, and as shown in FIG. , is attached to the outlet side header 6 via a heat-resistant packing 9 and a nut 10, and is attached to the outlet side header 2.
One end passing through is opened to the inlet side header 5,
As shown in FIG. 3, a shaft support 11 fitted into a hole provided in the inlet header 5 and a heat-resistant packing 1
2 and is attached to the artificial header 5 via a nut 13.

Note that the hole 15 provided in the inlet side header 1 and the hole 14 provided in the outlet side header 2 are provided with a slightly larger diameter than the outer diameter of the outer tube 3.

The heat exchanger configured in this manner is particularly suitable for supplying a low-temperature first fluid from the inlet header 1 and supplying a high-temperature second fluid from the inlet header 5 for heat exchange. However, on the contrary, heat may be exchanged by supplying a high temperature first fluid from the inlet header 1 and supplying a low temperature second fluid from the inlet header 5.

In either case, the first fluid flows through the inlet header 1, the outer pipe 3, and the outlet header 2, and the second fluid flows through the inlet header 5, the inner pipe 4, and the outlet header. 6, the first fluid and the second fluid flow countercurrently and exchange heat.

At this time, since the inner tube 4 is arranged inside the outer tube 3 and has a double tube structure, the first fluid can be guided by the spiral fins and brought into contact with a wider heat transfer surface. At the same time, it is possible to uniformly fluidize at high speed, reduce film resistance and increase the convection heat transfer coefficient, and by flowing countercurrently, the logarithmic average temperature difference between the first and second fluids can be reduced. The heat transfer area can be made smaller for the same amount of heat transfer, and therefore, heat can be exchanged effectively.

Note that when the high-temperature second fluid is supplied from the inlet header 5 and allowed to flow down inside the inner tube 4, radiant heat from the outer wall surface of the inner tube 4 can be more effectively transferred to the lower-temperature first fluid. Can be done.

If either or both of the outer tube 3 and the inner tube 4 become dirty and need to be cleaned, this can be done as follows.

First, the lid 16 attached to the inlet header 5 by suitable means such as screws and the lid 17 similarly attached to the outlet header 6 are removed.

Next, a tool is inserted into the hole 18 provided in the inlet side header 5 and the hole 19 provided in the outlet side header 6 to loosen the nuts 13 and 10 and remove them from the inner tube 4, and then sequentially, The shaft supports 11 and 8, the inlet header 5, and the outlet header 6 are removed, and one end of the inner tube 4 is grasped and pulled to be pulled out from the outer tube 3.

Dirt adhering to the extracted inner tube 4 can be removed using a suitable cleaning tool such as a brush.

In addition, dirt adhering to the inside of the outer tube 3 can also be removed from the hole 14 or 15.
It can be removed by inserting a suitable cleaning tool.

For assembly, after inserting the cleaned inner tube 4 into the outer tube 3 through the hole 14 or 15, the ladder 5 and the outlet header 6 are brought into contact with the inlet side, and the shaft supports 11 and 8 are fitted. The inner tube 4 can be attached by screwing the nuts 13 and 10 onto the inner tube 4.

Note that the first fluid and the second fluid may be a liquid as well as a gas.

Further, the outer wall surface of the body 7 or the outer tube 3 may be covered with a heat insulating material or a heat insulating material, but it is particularly preferable to cover the outer wall surface of the outer tube 3 with a heat insulating material.

As described above, the plurality of outer tubes are provided with one end opened at the inlet side header to which the first fluid is supplied, and the other end opened at the outlet side header from which the first fluid is discharged. and a spiral fin with one end passing through an inlet side header to which the first fluid is supplied and the other end passing through an outlet side header from which the first fluid is discharged and disposed within each of the outer tubes of the plurality of bodies. an inner pipe; and an inlet-side header in which one end of the inner pipe with spiral fins passing through the outlet-side hellagu from which the first fluid is discharged is open, and a second fluid having a temperature different from that of the first fluid is supplied. and an outlet side header from which the second fluid is discharged, the other end of which is open at the other end of the spiral finned inner tube passing through the inlet header to which the first fluid is supplied; The header on the inlet side to which the first fluid is supplied and the header on the outlet side to which the first fluid is discharged are installed so that the composite heat transfer coefficient can be increased; therefore, heat can be transferred effectively. At the same time, an economical and compact heat exchanger whose outer tube and inner tube can be easily cleaned can be obtained.

Note that the inlet header to which the first fluid is supplied, the outlet header to which the first fluid is discharged, the inlet header to which the second fluid is supplied, and the outlet header to which the second fluid is discharged are piping systems that are not shown. is connected to via a flange.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the heat exchanger according to the present invention, Fig. 2 is an enlarged detailed view of part A in Fig. 1, and Fig. 3 is an enlarged detailed view of part B in Fig. 1. . 1: Inlet header to which the first fluid is supplied, 2: First
Outlet header from which the fluid is discharged; 3: outer pipe; 4: inner pipe with spiral fins; 5: inlet header to which the second fluid is supplied; 6: outlet header from which the second fluid is discharged.

Claims (1)

[Scope of utility model registration request] a plurality of outer tubes each having one end opened at an inlet header to which the first fluid is supplied and the other end open at an outlet header from which the first fluid is discharged;
an inner tube with spiral fins disposed within each of the plurality of outer tubes, with one end passing through an artificial side header to which a fluid is supplied and the other end passing through an outlet side header from which a first fluid is discharged; an inlet header having an open end at one end of a spiral finned inner tube penetrating the outlet header from which the first fluid is discharged, and to which a second fluid having a temperature different from that of the first fluid is supplied; and an outlet side header from which the second fluid is discharged, the other end of which is an open spiral finned inner tube that passes through the inner tube on the inlet side to which the fluid is supplied; A heat exchanger characterized in that the heat exchanger is attached to an inlet side header to which the first fluid is supplied and an outlet side header to which the first fluid is discharged.