JPH0244897Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a jig used when expanding the tubes of a heat exchanger by aligning them and aligning the protruding position of the tubes from the tube sheet.

[Conventional technology]

When expanding a heat exchanger tube by aligning it with a tube sheet, conventionally an expander was used to expand the tube.
The skin is aligned while pressing with a round stick. In this method, the protruding position of the tube depends on the intuition of the operator, resulting in non-uniformity. In addition, at least two workers are required, and when there are a large number of tubes, there is a risk that the tubes to be matched may be mistaken for other tubes, and furthermore, the grooving may be damaged.

[Problem that the invention attempts to solve]

The object of the present invention is to provide a jig that eliminates the above-mentioned drawbacks of the conventional technology, allows the protruding positions of all tubes to be constant, and requires only one worker, reducing man-hours and improving work efficiency. There is a particular thing.

[Means for solving problems]

The means for solving the above problems, that is, the structure of the present invention is a jig which has an inner flange into which the bearing collar of the expander for expanding the tube is fitted, and which is in contact with the tip end surface of the bearing collar and the tube seat of the heat exchanger. The jig main body is provided with a protruding locking rod that enters into an adjacent tube.

〔Example〕

As shown in FIGS. 1 and 2, the jig of the present invention includes a stepped annular jig body 1 that fits into a bearing collar b of an expander a, and a detent rod 2 that fits into an adjacent tube c. The anti-rotation rod 2 is integrally attached to the jig body 1 by welding 3, and an inner rib 4 is provided at the tip of the jig body 1 so that the inner rib 4 covers the side end surface of the bearing collar b. Located in 5 is a fixing screw to the expander a screwed into the circumferential surface of the jig main body 1, d is a mandrel of the expander a, and e is a roller in contact with the inner surface of the tube c.

[Effect]

As shown in Fig. 2, cover the expander a with the jig main body 1, insert the expander a into the tube c of the heat exchanger, insert the detent rod 2 into the adjacent tube c, and expand the tube c. When the mandrel d is pushed in to do this, since the mandrel d is tapered, the roller e also becomes tapered and spreads out the tube c from the inside.
The reaction force pushes tube c toward the expander, that is, to the outside, and the tip of tube c stops in contact with bearing collar b. At this time, the jig main body 1 is stabilized by the rotation prevention rod 2. Also tube c
When increasing the protruding length of the inner brim 4 as shown in Figure 3.
Insert washer 6 inside.

[Effect of idea]

According to the present invention, the protrusion length of the tube end surface protruding from the tube sheet of the heat exchanger can always be made uniform, and the appearance is very good.
Furthermore, when performing face-to-face expansion, there is no need to hold down the tubes, only one worker is required, and even if there are a large number of tubes, they will not be mistaken for other tubes.

[Brief explanation of the drawing]

FIG. 1 is a side view of a tube protrusion alignment jig during tube expansion of a heat exchanger according to the present invention;
FIG. 2 is a longitudinal side view showing a state in which a tube is expanded using the jig of the present invention, and FIG. 3 is a longitudinal side view showing a state in which a washer is used to align the protrusion of the tube. 1... Jig body, 2... Rotating rod, 4... Inner rib, a... Expander, b... Bearing collar.

Claims (1)

[Scope of utility model registration request] The jig body has an inner flange into which the bearing collar part of the expander for expanding the tube is fitted, and which is in contact with the tip end surface of the bearing collar and the tube seat of the heat exchanger. A jig for positioning the tube protrusion during tube expansion of a heat exchanger, which has a protruding locking rod that enters the tube.