JP2590660Y2 - Baffle fixing structure of heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baffle fixing structure of a heat exchanger for fixing a baffle disposed on a tube sheet at a predetermined pitch with spacers interposed therebetween.

[0002]

2. Description of the Related Art In a heat exchanger, a large number of tube bundles forming a transfer passage for a heat exchange fluid are connected to a tube plate. Each tube of the tube bundle is held at a predetermined interval, and the outside of the tube bundle is held. A plurality of baffles are arranged on the tube sheet at a predetermined pitch so as to meander the passing heat exchange fluid.

That is, as shown in FIGS. 4 and 5,
A tube bundle 3 composed of U-shaped heat transfer tubes 2 is connected to the tube sheet 1, and a plurality of baffles (baffle plates) 4 are arranged at a predetermined pitch from the tube sheet 1 to insert and support the tube bundle 3. In order to fix the interval between these baffles 4, baffles 4
A pipe-shaped spacer 5 is interposed between the four. Further, as shown in FIG. 6, each baffle 4 is formed with an insertion hole 7 through which the baffle fixing member 6 is inserted so as to integrally fix each of the baffles 4, and as shown in FIGS. One end of the baffle fixing member 6 is screwed into a screw hole 8 formed in the tube sheet 1, and the other end of the baffle fixing member 6 is connected to the last baffle 4 a via a nut 9 through the inside of the spacer 5 and the insertion hole 7. The attached structure is called a tie rod (fixed rod) 11.

In FIG. 5, reference numeral 12 denotes an insertion hole through which the heat transfer tube 2 is inserted.

[0005]

When the heat exchanger is operated, the heat exchange fluid passing through the heat transfer tubes 2 causes the heat transfer tubes 2 to vibrate, so that the entire tube bundle 3 vibrates and is attached to the tube sheet 1. The tie rod 11 generates a bending force at the mounting portion, causing fatigue.

In order to assemble the tube bundle 3, one end of the tie rod 11 is screwed and fixed to the tube sheet 1, a spacer 5 for fixing the interval between the baffles 4 is mounted along the tie rod 11, and then the baffle 4 is mounted. The tie rod 1 is exposed from the last baffle 4a.
A nut 9 is attached to the other end of the baffle 1 and each baffle 4 is tightened and fixed. For this reason, as shown in FIG.
1 from the tube sheet 1 and the tie rods 11 are again
When the tie rod 11 is screwed into the screw hole 8, the tie rod 11 is covered with the spacer 5, so that the mounting of the tie rod 11 in the screw hole 8 cannot be visually observed, and the mounting operation of the tie rod 11 becomes difficult.

The present invention has been made to effectively solve the above problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a baffle fixing structure of a heat exchanger which can alleviate fatigue of a mounting portion of a baffle fixing member mounted on a tube sheet and can easily perform a re-check operation of the baffle fixing member. And

[0009]

According to a first aspect of the present invention, there is provided a pipe-shaped spacer for fixing the interval between a plurality of baffles so as to cover the baffle fixing member along a baffle fixing member having one end connected to a tube sheet. In the baffle fixing structure in which the baffle fixing member is attached and the other end of the baffle fixing member is connected to the last baffle, the baffle fixing member has one end connected to the tube plate through a mounting portion and the other end. Is a wire which is connected to the rearmost baffle via the mounting portion.

In a second aspect of the present invention, a baffle fixing member is mounted along a baffle fixing member having one end connected to a tube plate so as to cover the baffle fixing member and to fix a gap between a plurality of baffles. In the baffle fixing structure in which the other end of the baffle is connected to the rearmost baffle, the spacer between the tube sheet and the first baffle adjacent to the tube sheet is partially or entirely divided in the circumferential direction. It is.

[0011]

According to the first aspect of the present invention, since the baffle fixing member is formed of a wire, a bending force does not act on the mounting portion due to the flexibility of the wire, so that fatigue can be reduced.

In the second invention, since the spacer between the tube sheet and the first baffle adjacent thereto is divided in the circumferential direction, if the spacer is divided, the mounting portion of the baffle fixing member can be visually observed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The outline of the multi-tube heat exchanger has already been described with reference to FIG.
5 and the description thereof is omitted in this embodiment.

As shown in FIG. 1, a plurality of baffles 4 are provided on a tube sheet 1 with a pipe-shaped spacer 5 interposed therebetween at a predetermined pitch.
In order to fix these baffles 4, the tube sheet 1 and the last baffle 4a are connected by a baffle fixing member 6.

In particular, the first invention is characterized in that the baffle fixing member 6 is constituted by a wire 21, and one end of the wire 21 is detachably screwed to the tube sheet 1. The other end of the wire 21 is connected to a mounting part (mounting ring) 2.
3 and a nut 24 to the rearmost baffle 4a.

Specifically, one end of a wire 21 is connected to a mounting portion 22 screwed into the tube sheet 1 and the wire 21
After alternately repeating the mounting of the baffle 4 via the spacer 5 and the insertion hole 25 so as to cover the wire 21, the mounting portion 23 is connected to the other end of the wire 21, and the mounting portion 23 is connected to the rearmost portion. Each baffle 4 is integrally fixed by being inserted into the baffle 4a and engaging the nut 24 with the exposed portion to tighten it. In order to securely fix the baffle 4, the tube plate 1 and the insertion hole 25 of each baffle 4 are provided with a notch groove 26 engaging with an end of the spacer 5.
Are formed.

By fixing the baffle 4 with the wire 21 in this manner, the wire 21 has flexibility, so that no bending force acts on the attachment portion 22 attached to the tube sheet 1 and no fatigue occurs.

Next, in the second invention, as shown in FIG. 2, a spacer 5a between the tube sheet 1 and the first baffle 4b adjacent to the tube sheet 1 is partially or entirely moved in the circumferential direction. The spacer 5a is composed of divided pieces 31 and 32 divided into two in the circumferential direction.

Therefore, when pulling out the baffle fixing member (fixing rod in the illustrated example) 6 from the tube sheet 1 and re-attaching it during inspection, the spacer 5a is attached to each of the divided pieces 31,
If the tube plate 1 is divided into 32, the space between the tube sheet 1 and the first baffle 4b is opened, and the tip of the baffle fixing member 6 can be exposed, so that the baffle is fixed to the screw hole 8 formed in the tube sheet 1. The member 6 can be easily screwed.

After the baffle fixing member 6 is remounted, the divided pieces 31 and 32 are butted so as to cover the baffle fixing member 6, and the butted portions 33 are joined by welding (longitudinal welding). In this case, in addition to welding, the butted state of each of the divided pieces 31 and 32 may be fixed by clamping means for sandwiching the outer peripheral portion of the spacer 5a. Alternatively, as shown in FIG.
And a cut groove 26 is formed in each of the baffles 4b,
The axial ends of the spacer 5a may be engaged with the cut grooves 26. These cut grooves 26 hold the divided pieces 31 and 32 of the spacer 5a in an abutting state, thereby restricting the entire movement of the spacer 5a.

FIG. 3 shows a second embodiment of the present invention.
Is partially divided in the circumferential direction.
a is a divided piece 34 on the tube sheet 1 side and a divided piece 3 on the baffle 4b side.
5 is divided into two in the axial direction, and the divided piece 35 on the baffle 4b side is composed of small divided pieces 36 and 37 divided into two in the circumferential direction. Therefore, after the baffle fixing member 6 is reattached, the small divided pieces 36 and 37 on the baffle 4b side are butted against each other, and the butted portion 38 is welded and joined to form a divided piece 35. The divided piece 35 and the tube sheet 1 are formed. Side split piece 34
Are butted against each other in the axial direction, and the butted portion 39 is welded and joined to form the spacer 5a.

[0023]

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) In the first aspect, since the baffle fixing member is formed of a wire, fatigue of a mounting portion of the baffle fixing member can be reduced.

(2) In the second aspect, the spacer between the tube sheet and the first baffle adjacent thereto is partially or entirely divided in the circumferential direction, so that the baffle fixing member can be easily remounted. I can do it.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a baffle fixing structure of the first invention.

FIG. 2 is a sectional view showing a baffle fixing structure according to a second invention.

FIG. 3 is a sectional view showing another example of the baffle fixing structure of the second invention.

FIG. 4 is a cross-sectional view showing a multitubular heat exchanger.

FIG. 5 is a perspective view showing a baffle fixing structure.

FIG. 6 is a sectional view showing a conventional baffle fixing structure.

[Explanation of symbols]

 Reference Signs List 1 tube sheet 4 baffle 4a last baffle 4b first baffle 5 spacer 6 baffle fixing member 21 wire 22, 23 attachment portion

Claims (2)

(57) [Scope of request for utility model registration] 1. A pipe-like spacer for fixing the interval between a plurality of baffles so as to cover the baffle fixing member along a baffle fixing member having one end connected to the tube sheet,
In the baffle fixing structure in which the other end of the baffle fixing member is connected to the rearmost baffle, the baffle fixing member is connected to the tube sheet at one end and the other end is connected to the rearmost baffle. A baffle fixing structure for a heat exchanger, comprising a wire connected to the baffle through a mounting portion. 2. A pipe-like spacer for fixing the interval between a plurality of baffles so as to cover the baffle fixing member along a baffle fixing member having one end connected to the tube sheet,
In the baffle fixing structure in which the other end of the baffle fixing member is connected to the last baffle, a spacer between the tube sheet and the first baffle adjacent to the tube sheet is partially or entirely formed in a circumferential direction. A heat exchanger baffle fixing structure characterized by being divided.