JP2589867Y2 - Heat exchanger for cooling tower - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a heat exchanger for a cooling tower.

[0002]

2. Description of the Related Art This type of heat exchanger for cooling towers has already been described in the official gazettes of Japanese Utility Model Laid-Open No. 3-87067 and Japanese Patent Laid-Open No. 2-187593 and has been disclosed.

The closed type heat exchanger in the cooling tower described in the prior art is provided with fins.

[0004]

In the above-mentioned prior art, the fins are provided on the straight pipe portions of all the closed heat exchangers at a large interval in a posture perpendicular to the straight pipe portions. Since the gas-liquid contact passage is formed between the fins, the height of the closed heat exchanger at each stage is increased, and the height of the entire heat exchanger is increased. An object of the present invention is to solve the above-mentioned problem by improving a fin portion of a closed type heat exchanger, and to provide a heat exchanger for a cooling tower having a reduced overall height to the market.

[0005]

In order to solve the above-mentioned problems, a specific invention is to provide a closed type heat exchanger with fins arranged below and above a spraying water sprinkling section in a multi-tiered manner in a vertical hierarchy. In the cooling tower heat exchanger, the supply end of the exchanger is freely connected to the common circulation cooling water supply header on the exhaust port side, and the discharge end thereof is freely connectable to the common circulation cooling water discharge header on the outside air intake side. The hermetically sealed heat exchanger in each stage is composed of a substantially horizontal cooling coil, and a flat fin having a plate shape is laid substantially horizontally between adjacent straight pipe portions of the cooling coil. This is a heat exchanger for a cooling tower, wherein a number of holes are formed.

[0006] The flat fin is made of a lath net-like synthetic resin plate, and the spray water flow-down hole has a rhombus shape. A part of the flat fin has a cylindrical shape so as to hold the straight pipe portion from the peripheral surface. It is desirable to be characterized by being formed in a shape.

Preferably, the cooling tower is a cross-flow cooling tower.

[0008]

The operation of the device according to the first aspect of the present invention is as follows. In the summer, when applied to the cross-flow cooling tower according to claim 3, the spray water is sprayed from the spray portion to all of the hermetic heat exchanger groups below, and the hermetic heat exchanger of all stages is sprayed. The circulating cooling water circulating in the exchanger group is indirectly cooled. More specifically, in each of the stages, the fins, which are suspended almost horizontally between the adjacent straight pipe portions of the cooling coil in the hermetic heat exchanger, attempt to flow downward through the spray water flow holes. The spray water temporarily stays on the surface of the fin, forms a wetting wall on the front and back surfaces, and is directly contacted with the horizontal air flow introduced from the outside air intake of the cross-flow cooling tower to be cooled. The circulating cooling water flowing in the closed heat exchanger is indirectly cooled.

In the invention described in claim 2, the flat fin is made of a lath net-like synthetic resin plate, the hole for spraying water is rhombic, and a part of the flat fin is connected to the straight pipe. Because it is characterized by being formed in a cylindrical shape so as to hold the part from the peripheral surface, in the rhombic spray water flow down hole formed in the lath net-shaped synthetic resin plate,
Similarly to the operation of the above-mentioned specific invention, the spray water flows down from a large-diameter hole having a large area, and comes into contact with the air flow in a cross flow, forms a wetted wall and is cooled by itself, and the hermetic heat exchange is performed. The circulating cooling water flowing in the vessel is indirectly cooled. At this time, a part of the flat fin is formed in a cylindrical shape, and holds the straight pipe peripheral surface of the cooling coil.
The flat fin is firmly positioned and arranged on the straight pipe portion.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a typical embodiment of the invention as claimed in claims 1 to 3. In FIG. 1, A is a cross-flow cooling tower, and a fin is provided below an upper water tank 10 as a water sprinkling part. Hermetic heat exchangers B are arranged in multiple stages in upper and lower layers,
The circulating cooling water supply end of the hermetically sealed heat exchanger B has a common supply header 12 on the exhaust port side (not shown), and the circulating cooling water discharge end has a common discharge header 14 on the outside air intake 13 side. Are provided with heat exchangers C for cooling towers, each of which is freely connectable. The sealed heat exchanger B in each stage
Consists of a substantially horizontal cooling coil E.
A flat fin H having a plate shape is horizontally stretched between adjacent straight pipe portions F. This flat fin H is provided with a large number of holes 15 for spraying water flowing down (see FIG. 2). The flat fin H is made of a lath net-like synthetic resin plate, and the spray water flow-down hole 15 has a rhombus shape. A part of the flat fin H holds the straight pipe portion F from the peripheral surface. It is formed in a cylindrical shape. The heat exchanger C may be used in combination with a filler J and a closed heat exchanger K without fins as needed (see FIG. 1). As a method for manufacturing the flat fin H, a rectangular flat synthetic resin plate 16 is prepared, and a staggered slit 17 is formed in the plate 16 in a direction perpendicular to the axis 0 of the straight pipe portion F in multiple stages. (See FIG. 3).

Next, in order to insert the straight pipe portion F,
At a predetermined pitch, the plate 16 is bent alternately up and down in the axial direction of the straight pipe portion into a semi-arc shape to form upper and lower half-arc portions 18 and 19 for inserting the straight pipe portion (FIG. 4 and FIG. 4). (See FIG. 5). At this time, the discontinuous portion 17a of the odd-numbered (or even-numbered) slit 17 is located at the center of the peripheral surface of the semicircular arc portions 18, 19, and the entirety of the even-numbered (or odd-numbered) slit 17 is formed. The circumference is located on the entire circumference of the semicircular arc. Thereafter, the straight pipe portion F is inserted into the semicircular arc portions 18 and 19 thus formed, and in this state, the plate 16 is pulled from both sides in the direction of the axis 0 of the straight pipe portion F, and the slit 17 is dispersed in a rhombic shape. The periphery of the straight pipe part F is held and integrated by contracting the semicircular arc parts 18 and 19 while expanding the hole into the water flow hole 15 to obtain a sealed heat exchanger B with fins (see FIG. 5). The length of the slits 17 in the semicircular arc portions 18 and 19 is determined in the longitudinal direction of the plate 16, that is, the central portion P in the axial direction of the straight pipe portion F.
If it is formed sequentially longer toward both ends (see FIG. 6),
In the step of pulling the plate 16, bites around the straight pipe F of the plate 16 occur sequentially from the central portion P of the straight pipe F toward both ends, and the fin H is attached to the straight pipe F. It will be sure. The operation of each of the above embodiments is the same as the operation of the invention described in the corresponding claims, and thus the description thereof will be omitted.

[0012]

According to the first aspect of the present invention, the closed type heat exchangers with fins are arranged in a plurality of stages below and below the spraying water sprinkling section.
The supply end of these closed type heat exchangers is for a common cooling water supply header on the exhaust port side, and the discharge end is for a cooling tower that can be connected to the common circulation cooling water discharge header on the outside air intake side. In the heat exchanger, the hermetic heat exchanger in each stage is composed of a substantially horizontal cooling coil, and a flat fin having a plate shape is extended substantially horizontally between adjacent straight pipe portions of the cooling coil. Since the fins are characterized by having a large number of holes for spraying water flowing down, the height of the closed type heat exchanger with fins at each stage is equal to the diameter dimension of the cooling coil, and the conventional fins are vertically The height of the closed type heat exchanger can be reduced as compared with the mounted type, and the height of the entire heat exchanger can be reduced. Furthermore, in the closed type heat exchanger with fins, the spray water flows down through the spray water flowing down holes provided in the flat fins, and the spray water indirectly flows through the closed type heat exchanger with fins. Cooling water can be cooled sequentially. In the invention described in claim 2, in addition to the effect of the invention described in claim 1, the flat fin is formed of a lath net-like synthetic resin plate, and the spray water flow-down hole is formed as a rhombus. Since a part of the fin is formed in a cylindrical shape so as to hold the straight pipe portion from the peripheral surface, a diamond-shaped spray water flow down hole formed in a lath net-like synthetic resin plate. In the spray water, while flowing down from a hole having a large area formed in a rhombus, contacts the air flow, forms a wet wall and is cooled by itself, the circulating cooling water flowing through the hermetic heat exchanger In addition to being able to indirectly cool, a part of the flat fin is formed in a cylindrical shape and holds the peripheral surface of the straight tube portion of the cooling coil. And positioning can be arranged.
According to the third aspect of the present invention, the effects of the first and second aspects of the present invention are sufficiently exhibited in the cross-flow cooling tower, and the spray water temporarily stays on the surface of the fin. It forms a wetted wall, directly in contact with the horizontal air flow introduced from the outside air intake of the crossflow cooling tower, and indirectly cools the circulating cooling water that is cooled and flows through this enclosed heat exchanger. it can.

As described in the embodiment, a rectangular and flat synthetic resin plate 16 is prepared, and the plate 16 is provided with staggered slits 17 in a direction perpendicular to the axis 0 of the straight pipe portion F. Are cut in multiple stages, and the plate 16 is connected to the straight pipe portion F.
Are bent alternately in the shape of a semicircle in the direction of the axis 0 to form the semicircular portions 18 and 19 for inserting the straight pipe portion, and then the straight pipes are added to the semicircular portions 18 and 19 thus formed. In this state, the plate 16 is pulled from both sides in the direction of the axis 0 of the straight pipe portion F to expand the slit 17 into the rhombus-shaped spraying water flow-down hole 15, and the semicircular arc portion 18 of the plate 16 , 19 to hold and integrate the periphery of the straight pipe portion F, the closed type heat exchanger B with fins can be manufactured at low cost. In addition, the length of the discontinuous portion 17a of the slit 17 in the semicircular arc portions 18, 19 is determined by
Of the straight pipe portion F from the central portion P toward both ends in the step of pulling the plate material 16 in the axial direction.
Bites around the straight pipe portion F sequentially occur, and the fin can be securely attached to the straight pipe portion F.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a main part of a cross-flow cooling tower according to an embodiment.

FIG. 2 is a perspective view showing a part of the closed finned heat exchanger of FIG. 1;

FIG. 3 is a plan view of a plate material with a slit, which is a fin material.

FIG. 4 is a plan view of the plate member in a state where a semicircular arc portion for inserting a straight pipe portion is formed in the plate member of FIG. 3;

FIG. 5 is a front view of the plate shown in FIG. 4, showing a state in which the slit is expanded by pulling the plate in the axial direction of the straight pipe portion.

FIG. 6 is a plan view of a plate having a slit different from that of FIG. 3;

[Explanation of symbols]

 A Cross-flow cooling tower B Sealed heat exchanger with fins

Claims (3)

(57) [Scope of request for utility model registration] 1. A closed type heat exchanger with fins is arranged in a plurality of stages below and below a circulating water sprinkling section, and a supply end of these closed type heat exchangers has a common circulating cooling side on an exhaust port side. In the cooling tower heat exchanger, the discharge end of the water supply header is freely connectable to a common circulating cooling water discharge header on the outside air intake side. The cooling is characterized in that a flat fin having a plate shape is extended substantially horizontally between adjacent straight pipe portions of the cooling coil, and a number of holes for spraying water are formed in the flat fin. Heat exchanger for tower. 2. The flat fin is made of a lath net-shaped synthetic resin plate, and the spray water flow-down hole has a diamond shape. A part of the flat fin holds the straight pipe portion from the peripheral surface. 2. The device according to claim 1, wherein said member is formed in a cylindrical shape.
The heat exchanger for a cooling tower as described in the above. 3. The heat exchanger according to claim 1, wherein the cooling tower is a cross-flow cooling tower.