JPS621580Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a double-tube heat exchanger with leak detection grooves.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A conventional double pipe heat exchanger of a heat pump type heating device will be explained with reference to FIGS. 1 and 2.

Reference numeral 1 denotes an outer tube through which fluid flows into an inner space 2.
Reference numeral 3 denotes an inner tube, which is composed of an outer tube 3a, a leak detection groove 3b, and an inner tube 3c. 3d is the outlet of the leak detection groove 3b to the atmosphere, and 3e is the outlet of the inner pipe 3.
This is the flared part at the tip. 4 is an internal space of the inner tube 3, through which fluid flows. 5 is a fluid conduit flowing into the space 2; Reference numeral 6 denotes a fluid conduit that flows into the space 4, and is sealed all around with the inner tube 3c at a sealed portion 6a. 7 connects the outer periphery of the conduit 5 and the inner tube 3 to the outer tube 1
It is a sealed part that is sealed with the inner periphery of.

If the outer tube 3a or the inner tube 3c of the inner tube 3 has a hole due to corrosion etc., the fluid entering the hole from 2 or 4 will reach the leak detection groove 3b and will be released into the atmosphere from the outlet 3d. Fluids do not mix.

However, in a heat exchanger having such a structure, when flaring the tip flaring portion 3e of the inner tube 3,
There is a risk that the outlet 3d of the leakage detection groove 3b may be crushed, or when the sealing portion 6a of the conduit 6 is sealed, the sealing material may flow to the outlet 3d and clog the outlet 3d.

The present invention has been made to improve the above problem. That is, the outlet of the leak detection groove is provided at a location separate from the sealing part, thereby eliminating the risk of burying the outlet of the leak detection groove with the sealing material during sealing.

The present invention will be explained below with reference to an embodiment shown in FIGS. 3 and 4. Components with the same reference numerals as those in the conventional example indicate the same components. Reference numeral 13 denotes an inner tube, which is composed of an outer tube 13a, a leak detection groove 13b, and an inner tube 13c that is longer than the outer tube 13a. 13d is an outlet of the leak detection groove 13b to the atmosphere. 6b is a sealing portion between the conduit 6 and the inner tube 13c. Outer tube 1 of inner tube 13
3a or the inner pipe 13c has a hole due to corrosion etc., the fluid entering the hole from the space 2 or 4 reaches the leak detection groove 13b and is released into the atmosphere from the outlet 13d, so the fluids will not mix with each other. do not have.

In a heat exchanger with this structure, the leakage detection groove 1
Since the outlet 13d of the outlet 3b is remote from the sealing part 6b, there is no risk that the sealing material of the sealing part 6b will clog the outlet 13d. In addition, the outer pipe 13a of the inner pipe 13
Instead of making the inner tube 13c shorter than the inner tube 13c, the outer tube 23a of the inner tube 23 and the inner tube 2
3c to the same length and cutting off a part of the outer tube 23a all around to provide the outlet 23d, the outlet 23d is separated from the sealing part 6c, so the sealing material of the sealing part 6c is Exit 23
There is no danger of tripping up d.

In the present invention, the outlet of the leak detection groove is separated from the part where the inner pipe and the conduit are sealed with the sealing material, so there is no risk of blocking the outlet of the leak detection groove with the sealing material during sealing. This has the effect of providing a double-pipe heat exchanger that can eliminate defects during sealing operations such as brazing of the heat exchanger.

[Brief explanation of the drawing]

Figure 1 is a conventional double-tube heat exchanger, Figure 2 is a sectional view taken along line A-A in Figure 1, Figures 3 and 5 are the double-tube heat exchanger of the present invention, and Figure 4 is is a sectional view taken along line B-B in FIG. 3. 1... Outer tube, 3, 13, 23... Inner tube, 3b,
13b, 23b...Leakage detection groove, 3d, 13d,
23d...Exit of leak detection groove 3b, 13b, 23b.

Claims (1)

[Scope of utility model registration request] A double tube heat exchanger comprising an outer tube and an inner tube formed with a leak detection groove having an outlet opening into the atmosphere, wherein the outlet is connected to the inner tube and the inner tube by a sealing material. A double-pipe heat exchanger characterized in that it is provided at a position away from a sealed portion with a conduit to which it is sealed.