JP2003075079A - Direct/alternating flow type cooling tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat exchange efficiency by eliminating a damage due to freezing of a zigzag pipe upon draining, and mounting many fins on the pipe of a straight section in a heat exchanger at a distance with a small pitch axially of the pipe of the straight section with ease. SOLUTION: Many vertically expandable fin members 13 are mounted over a pipe 12 of a straight section axially thereof with a small pitch at a distance, and a zigzag pipe 10 is installed hierarchically in a direct/alternating flow type cooling tower at a predetermined distance in the state where a flat plane involving the zigzag pipe 10 is inclined downward at the angle of about 2 to 3 degree with respect to a horizontal plane. The fin member 13 comprises a rectangular plate made of a synthetic resin flattened over the entire thereof, and through-holes, into and with which the pipe 12 of the straight section is inserted and brought into close contact, are formed in the rectangular plate in an equal interval with a predetermined pitch. Further, there is formed a slit section extendable radially of the pipe 12 of the straight section between the adjacent insertion holes in the assembled state to the zigzag pipe 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cross-flow cooling tower.

[0002]

2. Description of the Related Art In a meandering tube of this type of finned closed heat exchanger, straight portions which are successively connected by U-shaped bent portions are formed in parallel with each other. Therefore, when the meandering surface is installed horizontally, the height of the entrance and exit of the meandering pipe is slightly different so that the drainage in the pipe can be easily performed. In addition, the applicant of the present invention has previously developed a heat exchanger in which a straight tube in a meandering tube connected by a bent portion is not parallel, and the included angle is about 30 minutes to 3 degrees (actually 63- However, since the linear portions are non-parallel, it is not easy to attach the fin material.
Even if it is installed, it will increase the cost.

[0003]

However, the individual straight portions are installed completely horizontally with respect to the surface of the earth, and even if the liquid inside is drained, some liquid does not completely escape and some liquid remains. It will remain in the meandering tube. After installation, when the meandering tube is distorted by some external force,
A considerable amount of liquid may remain on some of the straight portions, for example, when water remains, it may freeze in the winter or in cold regions to damage the meandering pipe. This invention solves the above-mentioned known drawbacks, prevents liquid from remaining in the meandering pipe when draining water, eliminates breakage due to freezing of the meandering pipe, and eliminates the problems in the heat exchanger. It is possible to provide a cross-flow cooling tower with improved heat exchange efficiency by easily attaching a large number of fin materials to the straight pipe at a small pitch in the axial direction of the straight pipe. To aim.

[0004]

In order to solve the above-mentioned problems, a specific invention is that a heat exchanger with fins having a large number of fins provided in a straight part of a meandering tube is arranged in a cross flow type cooling tower at intervals. The heat exchanger with fins has a common supply header connected to the supply end of the heat exchanger with fins, and the discharge end of the heat exchanger with fins has a common discharge header. The pipes of the linear parts which are connected at a position higher than the side and which are connected by the bent portions of the meandering pipe in the finned heat exchanger are not parallel to each other and the included angle is about 30 minutes to 3 degrees. A large number of vertically expandable fin materials are attached to the straight pipes at a small pitch in the axial direction, and the meandering pipe has a plane including them inclined by about 2 to 3 degrees with respect to the horizontal plane. Tilt down at an angle There the cross-flow cooling tower, characterized in that it is installed.

In order to solve the above-mentioned problems, the fin material in the cross flow type cooling tower of the present invention is composed of a flat rectangular plate as a whole, and the insertion holes into which the straight pipes are inserted and adhered are predetermined at equal intervals. Along with opening the rectangular plate at a pitch,
Between the adjacent insertion holes, a slit portion that is expandable in the radial direction of the pipe of the linear portion is formed in the assembled state to the meandering pipe,

In order to solve the above-mentioned problems, the slit portion in the cross flow type cooling tower of the present invention has a first slit which does not reach the upper and lower edges in the transverse direction of the rectangular plate and is central and vertical, and the first slit. It is preferably formed by a second slit which is cut from above and below with a space on both sides.

In order to solve the above-mentioned problems, the fin material in the cross flow type cooling tower of the present invention is made of synthetic resin, and the fin material is provided in the radial direction of the pipe of the straight part according to the included angle of the pipe of the straight part. It may be expanded and fixed to the straight tube.

In order to solve the above-mentioned problems, a common supply header and a common discharge header in the cross-flow cooling tower of the cross-flow cooling tower of the present invention are located on the same side, and the inclination angle of a plane including the meandering pipe is In some cases, the discharge side is lower by 2 to 3 degrees with respect to the horizontal plane.

[0009]

Embodiment 1 This embodiment is a typical embodiment of the invention described in claims 1 to 4. In FIG. 1, the common feed header 15 of the cross-flow cooling tower has a feed end of the finned heat exchanger 20 and the common discharge header 16 has a feed end of the finned heat exchanger 20. Are connected at a position higher than the discharge end, and the finned closed heat exchanger 20 is loaded in the cross-flow cooling tower.
The meandering tube 10 in the finned closed heat exchanger 20.
The adjacent straight pipes 12 connected by the bent portions 11 are not parallel to each other, and the included angle θ between the bent portions 11 is 30 minutes to 3 degrees, preferably about 37 minutes to 50 minutes. In addition, the radius of curvature R of the axis of the bent portion 11 = tube diameter d × x, x
= 1.2 to 2 (see FIG. 2). In general, it is preferable that the radius of curvature R of this axis be smaller than that of the prior art in which the straight portions 12 are parallel. These straight tubes 1
A large number of vertically expandable fin members 13 are attached in the axial direction at a small pitch in the axial direction, and the plane including the meandering tube 10 is inclined at an angle α of about 2 to 3 degrees with respect to the horizontal plane. The meandering tubes 10 are installed in the cross flow type cooling tower in a hierarchical manner with a predetermined interval in a state of being inclined downward.

The fin member 13 is made of a rectangular flat plate made of a synthetic resin as a whole, and insertion holes 13a into which the tubes 12 of the respective straight portions are inserted and adhered are formed in the rectangular plate at equal intervals with a predetermined pitch. Along with the insertion holes 13a adjacent to each other, a slit portion 13b is formed which is expandable in the radial direction of the straight tube 12 when assembled to the meandering tube 10.

The slit portion 13b does not reach the upper and lower edges in the transverse direction of the rectangular plate, and the central first slit 13b is vertical.
c and a second slit 13d which is cut from above and below the first slit 13c with a space provided therebetween (see FIGS. 3 and 4).

An example of a method of assembling the fin member 13 will be described. The straight pipes 12 are parallel to the straight pipes 12 before being expanded to the included angle θ through the insertion holes 13a at a predetermined pitch. After inserting and fixing at intervals
In the state where the U-vent pipe forming each bent portion is brazed to the pipe end portion of the straight portion to form a meandering flow path, the straight-line portion of the straight-line portion 12 is used as a fulcrum to hold the flank angle θ. =
The tube 12 of the straight part is opened with opening for 30 minutes to 3 degrees.
And is expanded in the radial direction to form the finned closed heat exchange tube 20. There is no particular limitation on the material of the meandering tube 10 such as copper, stainless steel, and titanium alloy. In addition,
The angles α and θ shown in FIGS. 1 and 2 are exaggerated for convenience of description.

Embodiment 2 This embodiment is a typical embodiment of the invention described in claim 5, and is different from Embodiment 1 in that the common feed header 15 and discharge header 16 in the cross flow type cooling tower are The meandering pipe 10 located on the same side and connected to the discharge header 16 has an inclination angle β of about 2 to 3 degrees with respect to the horizontal plane, and both the headers 15 and 16 are inclined low. That is,
The opposite side of each serpentine tube 10 is at the higher position. Others, Example 1
The same reference numerals indicate the same configurations and perform the same operations (see FIG. 5).

[0014]

According to the invention described in claims 1 to 5,
When water is drained, the liquid is prevented from remaining in the meandering pipe, and a number of fin materials are attached to the pipe of the non-parallel straight line portion in the heat exchanger at a small pitch in the axial direction of the straight line pipe. Since they are mounted at intervals, the heat exchange efficiency can be improved. Further, in the above-mentioned structure, the plurality of fin members can be assembled and fixed to each other without damaging them by expanding the slit portions between the pipes of the adjacent straight portions forming the included angle. Further, after draining water, water does not remain in the meandering pipe, and there is no damage of the meandering pipe due to the freezing. Especially claim 3
In the invention described, in addition to the effect, the central vertical first slit between the tubes of the straight portion is small in the degree of expansion near the bent portion, and the degree of expansion can be increased as the distance from the bent portion increases, A large number of fin materials can be arranged vertically in parallel with each other at a small pitch corresponding to the included angle of the straight-lined pipes over the straight-lined pipes, and the spray water can be cooled in the cross-flow cooling tower. Can be promoted.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a closed heat exchanger with fins.

FIG. 2 is a perspective view showing a state in which the sealed heat exchanger without the fin of FIG. 1 is attached to a header and is used.

FIG. 3 is a front view of the fin material before expansion.

FIG. 4 is a front view showing a state in which a slit portion of the fin material of FIG. 3 is expanded.

FIG. 5 is a partially omitted perspective view showing the arrangement of headers different from that in FIG.

FIG. 6 is a plan view showing a state in which tubes of straight portions are inserted into the fin material shown in FIG. 3 in parallel with each other.

[Explanation of symbols]

10 meandering tube 11 Bend 12 straight part 13 Fine wood Closed heat exchanger with 20 fins θ angle α inclination angle

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F28F 21/06 F28F 21/06

Claims (5)

[Claims] 1. A heat exchanger with fins, in which a large number of fins are provided in a straight line portion of a meandering tube, are arranged in a multi-tiered manner at intervals in a cross flow type cooling tower, and the heat exchanger with fins is supplied. A common supply header is connected to the end, and a common discharge header is connected to the discharge end of the heat exchanger with fins, the supply end side is connected at a position higher than the discharge end side, and the heat exchange with fins is connected. In the vessel, the pipes of the adjacent straight parts connected by the bent parts of the meandering pipe are not parallel to each other, and the included angle is about 30 minutes to 3 degrees. A plurality of meandering tubes are installed at a small pitch in the direction, and the meandering tube is installed such that a plane including the meandering tube is inclined downward at an inclination angle of about 2 to 3 degrees with respect to a horizontal plane. Cross flow type cooling tower. 2. The fin member is made of a flat plate as a whole, and insertion holes into which the pipes of the straight line portion are inserted and adhered are opened at equal intervals in the rectangular plate, and the adjacent insertion plates are inserted. 2. The cross flow type cooling tower according to claim 1, wherein slits are formed between the holes so as to be expandable in a radial direction of the straight pipe in a state of being assembled to the meandering pipe. 3. The slit portion is a first slit which does not reach the upper and lower edges in the transverse direction of the rectangular plate and is perpendicular to the center, and a second slit which is cut from the upper and lower sides at intervals on both sides of the first slit. The cross-flow cooling tower according to claim 2, which is formed by 4. The fin material is made of synthetic resin, and is expanded in the radial direction of the straight section pipe in accordance with the included angle of the straight section tube and is fixed to the straight section tube. The cross-flow cooling tower according to claim 1, 2, or 3. 5. The common feed header and discharge header in the cross flow type cooling tower are located on the same side, and the inclination angle of the plane including the meandering pipe is set to be lower by 2 to 3 degrees with respect to the horizontal plane on the discharge side. Claims 1 and 2, characterized in that
The cross-flow cooling tower according to 3 or 4.