JP2002139298A - Heat exchanging body for cooling tower and cooling tower comprising it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate indirect cooling of circulation cooling water flowing through each U-bent tube at each stage by feeding an outdoor air flow to the joint of a straight tube and the U-bent tube and spraying water. SOLUTION: Recesses 15 for holding the outside of a U-bent tube 12 in an enclosed heat exchanger B at each stage are made in the opposite inner surfaces of a pair of supporting members 14. Outside of the U-bent tube 12 is inserted in the recesses 15 from the inside thereof and the enclosed heat exchanger B is supported vertically is multistage by supporting side plates 13. Since the outside at the bend of each U-bent tube 12 is contained in each recess 15, water is also sprayed to each U-bent tube 12 and outdoor air flow touches that part thus cooling circulation cooling water flowing through the enclosed heat exchanger B indirectly even at that part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for a cooling tower and a cooling tower having the heat exchanger.

[0002]

2. Description of the Related Art Many types of heat exchangers for cooling towers of this type have been developed and manufactured.
The following structure is manufactured. As shown in FIG. 4, a support plate (also referred to as a tube plate) of the heat exchanger 6 for a cooling tower is composed of a pair of left and right metal side plates 1, and each side plate is provided with a plurality of holes for pipes in upper and lower stages. After the burring process, the pipes 2 of the closed type heat exchanger are inserted into the holes of the respective stages, the ends of the adjacent pipes 2 are brazed with the U vent pipe 3 on the outer surface side of each side plate, and sealed. As the mold heat exchanger 5, a plurality of hermetic heat exchangers 5 are supported by the pair of side plates 1 over a plurality of upper and lower stages, and the cooling tower heat exchanger 6 is configured. At this time, all the U vent pipes 3 in the sealed heat exchanger 5 at each stage are concealed by the side plates 1.

[0003]

In the prior art, all the U vent pipes 3 in the closed type heat exchanger 5 at each stage are concealed by the side plates 1, so that each U vent pipe 3 There is no heat exchange between the circulating cooling water flowing through the inside of each U vent pipe 3 and the spraying water in the U vent pipe 3 without contact with the spray water, and the cooling efficiency of the circulating water tends to decrease. Further, when an earthquake occurs, there is a fear that the brazing portion, which is a connection portion between the pipe 2 and the U vent pipe 3, may be damaged, and the U vent pipe 3 may fall off. Since the pipe 2 and the side plate 1 are in direct contact with each other, electric corrosion occurs in this portion, and there is a possibility that small holes are formed in the pipe 2 to the U vent pipe 3. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem by improving a simple structure, to spray water to a U vent pipe, and to improve heat exchange efficiency of circulating cooling water.
Another object of the present invention is to improve the support structure of each U vent pipe of the heat exchange coil in each stage of the closed type heat exchanger so that each U vent pipe is dropped or damaged by vibration such as an earthquake. It is to prevent easily. Another object of the present invention is
The purpose is to prevent the occurrence of electric corrosion between the straight pipe or the U-vent pipe and the support side plate.

[0004]

In order to achieve the above-mentioned object, a specific invention is directed to a sealed heat exchanger comprising a cooling coil connected to a pipe by a U-vent pipe to form a circulating cooling water passage meandering in a planar direction. It is supported by a pair of supporting side plates almost horizontally in upper and lower stages, and the circulating water supply port of each of these sealed heat exchangers can be connected to a common supply header, and the circulating water discharge port can be connected to a common discharge header In the cooling tower heat exchanger, the inner surfaces of the pair of support side plates are provided with electrically insulating support members for U vent pipes in upper and lower stages.
A recess for holding the outer side of each bent portion of the U vent pipe in each of the hermetically sealed heat exchangers from above, below, right and left is formed in the opposed inner surfaces of the pair of electrically insulating support members. The inside of the U-vent pipe is inserted from the inside of the holding recess into the inside, and the closed heat exchanger is supported by a supporting side plate as a heat exchanger for a cooling tower.

In order to achieve the above object, in the heat exchanger for a cooling tower, the electrically insulating supporting member is made of synthetic resin, and each U-vent pipe of the heat exchange coil is made of metal. Is preferred. In order to achieve the object, in the heat exchanger for a cooling tower, the electrically insulating support member is formed of a channel material having a U-shaped cross section, and the depression corresponds to an outer surface of the bent portion, and holds the bent portion. The concave wall is preferably a concave curved surface, and its peripheral wall is convexly curved toward the support side plate, and preferably has a shape that prevents contact between the inserted U vent pipe and the support side plate. In order to achieve the above object, the pair of support side plates and the electrically insulating support member in the cooling tower heat exchanger may be integrally formed of a synthetic resin molded product.

[0006] In order to achieve the above object, a related invention includes:
A closed heat exchanger comprising cooling coils forming a circulating cooling water passage meandering in the plane by connecting the pipes with a U-vent pipe is supported by a pair of supporting side plates substantially horizontally in upper and lower stages, and each of these closed heat exchangers is provided. The circulating water supply port is connected to a common supply header, and the circulating water discharge port is a cooling tower having a heat exchanger connected to a common discharge header. An electrically insulating support member for U-vent pipes is provided in multiple stages, and a recess holding the outer side of the bent portion of each U-vent tube in the hermetically sealed heat exchanger of each stage from above, below, right and left is formed by the pair of electrically insulating supports. It is formed on the opposite inner surface of the member, and the outside of the U vent pipe is inserted into the holding recess from the inside of the holding recess, and the closed heat exchanger is supported by the supporting side plate. As a characteristic cooling tower That.

In order to achieve the above object, it is preferable that the electrically insulating support member of the cooling tower is made of a synthetic resin, and each U vent pipe of the heat exchange coil is made of a metal. . In order to achieve the above object, the cooling tower may be characterized in that the pair of support side plates and the electrically insulating support member are integrally formed. In order to achieve the above object, the electrically insulating support member in the cooling tower is formed of a channel material having a U-shaped cross section, and the holding recess is slightly larger than a radius of curvature of the U vent pipe in a plan view. It is preferable that an opening having an inner diameter is provided, and a peripheral wall of the opening has a curved surface protruding toward the support side plate, and has a shape for preventing contact between the inserted U vent pipe and the support side plate. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 In this embodiment, a typical embodiment of the invention described in claims 1, 2 and 3 is replaced by a typical embodiment of the invention described in claims 5, 6 and 8. It is explained together with. In FIG. 1, A denotes a cross-flow cooling tower, and a pipe 11 is connected by a U vent pipe 12 below an upper water tank 10 in the cross-flow cooling tower A, and a circulation cooling water passage meandering in a plane direction is provided. A sealed heat exchanger B comprising cooling coils to be formed is formed, and the sealed heat exchanger B is supported by a pair of supporting side plates 13 in a substantially horizontal manner at upper and lower stages (see FIG. 3). The circulating water supply port of the heat exchanger B is connected to a common supply header, and the circulating water discharge port is loaded with a heat exchanger T connected to the common discharge header. On the inner surfaces of the pair of supporting side plates 13 opposite to each other, electrically insulating supporting members 14 made of a channel material having a U-shaped cross section are fixed in multiple vertical stages.
Each U vent pipe 12 in each stage of the closed type heat exchanger B
A recess 15 for holding the outer side of the bent portion of the pair from above, below, left and right is formed on the opposing inner surfaces of the pair of electrically insulating support members 14.
Is inserted from the inside of the recess 15, and the hermetic heat exchanger B is supported by the supporting side plate 13 in multiple stages up and down (see FIGS. 2 and 3). These supporting side plates 13 are parallel to the flow direction of the outside air flow, and are columns (not shown) of the cooling tower A.
It is fixed to.

The depression 15 substantially matches the radius of curvature of the bent portion of the U vent pipe 12 when viewed in a plane, and
The diameter of the vent pipe 12 substantially corresponds to that of the U-vent pipe 1.
2 The outer side surface is formed as a recess capable of holding it, and its peripheral wall is formed in a curved shape protruding toward the support side plate 13 (see FIGS. 2 and 3). The depth of the depression 15 depends on the U-vent pipe 12.
The pipe 11 has at least a radius, preferably about a diameter (see FIGS. 2 and 3). If the depth of the depression 15 is smaller than this, the depression 15
The U vent pipe 12 may come off from the pipe, and if it is too deep, the heat exchange capacity will be almost the same as the conventional one. However, the depth of the depression 15 is
There is no specific meaning. The embodiment of the present invention is also applicable to a case where a gap for flowing spray water and an outside air flow is positively provided between the depression 15 and the U vent pipe 12 held by the depression 15 to further improve the heat exchange ability. included.

The hermetic heat exchanger B is a finned hermetic heat exchanger. In addition, a finless heat exchanger may be used as necessary.

The supporting side plate 13 is generally made of a metal plate having a large supporting force, for example, a steel plate plated with zinc or the like.
Using steel plate, synthetic resin plate with electrical insulation,
For example, a vinyl chloride plate may be used. The electrically insulating support member 14 is made of vinyl chloride, which is a kind of synthetic resin having electrical insulation, and each of the U vent pipes 12 is made of copper, which is a kind of metal. The electrically insulating support member 14 is not limited to the vinyl chloride, but may be a polyolefin-based synthetic resin such as polyethylene or polypropylene, or other engineering plastics.

The operation of this embodiment configured as described above is as follows. Even if an earthquake occurs, the outside of the U-vent pipe 12 is inserted into each of the depressions 15 from the inside of the depressions 15, and the hermetic heat exchanger B is supported by the support side plate 13, so that , Before and after the U vent pipe 12 of each stage
Does not come off from the support side plate 13 and does not fall off. In addition, since the U vent pipe 12 and the supporting side plate 13 are not firmly connected to each other, a large force does not act on the U vent pipe 12 even during a vibration such as an earthquake, and a part of the U vent pipe 12 is not damaged.

The electrically insulating supporting member 14 is made of vinyl chloride, which is a kind of synthetic resin having electrical insulation, and the pipes 11 and the U vent pipe 12 are made of copper, which is a kind of metal. No local battery phenomenon occurs between the electrically insulating support member 14 and each of the pipes 11 to the U vent pipes 12, so that no electric corrosion occurs in the U vent pipes 12, The phenomenon that the circulating cooling water leaks due to small holes does not occur. Furthermore, since the outside of each U vent pipe 12 is housed and supported in each recess 15, the U vent pipe 1
2 is also sprayed with water, and the outside air flow comes into contact with it, so that heat is exchanged also in this part, and the circulating cooling water flowing through the closed heat exchanger B is indirectly cooled,
The heat exchange capacity of the heat exchanger T is improved. If the pair of support side plates 13 and the electrically insulating support member 14 are integrally formed of a synthetic resin, there is no need to assemble them, and only the assembly with the closed type heat exchanger B is required, which is convenient for assembly. (Corresponding to the embodiment of the invention described in claim 4 or claim 7).

[0014]

According to the first, second, third and fourth aspects of the present invention, since the outside air flows around the U vent pipe and the spray water is sprayed, each U vent pipe in each stage is provided. Also in the part, indirect cooling of the circulating cooling water flowing therethrough can be promoted. In addition, even if an earthquake occurs, since each U vent pipe of each stage is held up and down, front and rear, and is held from up and down and left and right, each U vent pipe comes off from the depression of the support member. There is no danger of falling off or breaking the vent pipe and the pipes connected to it. Further, since the support member is made of the above-described electric insulating material, even if the support member is in contact with the vent pipe or the support side plate is made of metal, this and the vent pipe are completely shut off by the support member. There is no need to cause electrolytic corrosion of the vent pipe.

In particular, in the invention according to the second aspect, the electrically insulating supporting member is made of synthetic resin, and each of the U-vent pipes is made of metal. The pipes can be completely isolated from each other, and the occurrence of electric corrosion can be completely eliminated. Even if the supporting side plate is formed of metal, small holes due to the electric corrosion are formed in each of the U vent pipes or pipes. Does not occur, and the phenomenon that the circulating cooling water leaks can be prevented beforehand.

According to the third aspect of the present invention, the above effects can be remarkably exhibited, and the weight of the electrically insulating support member can be reduced. Since each of the U vent pipes is only inserted and supported in each of the recesses 15, even if the support side plate and the electrically insulating support member are slightly distorted due to a disturbance such as an earthquake, the respective U vent pipes are provided. No excessive force acts on the pipe or pipe, and there is no danger of breaking it. According to the fourth aspect of the present invention, in addition to the above effects, the pair of support side plates and the electrically insulating support member are integrally formed of a synthetic resin molded product, so that there is no need to assemble them, and the closed mold is not required. Only the assembly with the heat exchanger is required, and the assembling work of the heat exchanger can be simplified. Further, there is no problem of electric corrosion between each U vent pipe of the closed type heat exchanger, the pair of support side plates supporting the U vent pipe, and the electrically insulating support member.

According to the fifth aspect of the invention, the effects of the first aspect of the invention can be exhibited. According to the invention described in claim 6, the effect of the invention described in claim 2 can be exhibited. According to the invention described in claim 7, the effect of the invention described in claim 4 can be exhibited. According to the eighth aspect, the effects of the third aspect can be exhibited.

[Brief description of the drawings]

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

FIG. 2 is a partially omitted plan view of the heat exchanger in FIG.

FIG. 3 is a partially omitted perspective view of the heat exchanger in FIG.

FIG. 4 is a perspective view showing a conventional heat exchanger.

[Explanation of symbols]

 Reference Signs List A cross-flow cooling tower 10 upper water tank 11 pipe 12 U vent pipe B closed heat exchanger 13 support side plate 14 electrically insulating support member 15 depression

Claims (8)

[Claims] A closed heat exchanger comprising a cooling coil forming a circulating cooling water passage meandering in a planar direction by connecting pipes with a U-vent pipe is supported by a pair of supporting side plates substantially horizontally in multiple stages of up and down. The circulating water supply port of the closed type heat exchanger is connectable to a common supply header, and the circulating water discharge port is a cooling tower heat exchanger that can be connected to a common discharge header. On the inner surface, electrically insulating supporting members for U vent pipes are provided in upper and lower multi-stages, and the recesses for holding the outer sides of the bent portions of each U vent pipe in the hermetically sealed heat exchanger of each stage from above, below, left and right are formed by the pair. Are formed on opposing inner surfaces of the electrically insulating supporting member, and the outside of the U vent pipe is inserted into the recess from the inside of the recess, and the closed heat exchanger is supported by a supporting side plate. Characterized by cold A heat exchanger for the tower. 2. The electric insulating support member is made of a synthetic resin.
The heat exchanger according to claim 1, wherein each of the U vent pipes is made of metal. 3. The electrically insulating support member is formed of a channel material having a U-shaped cross section, the depression corresponds to the outer surface of the bent portion, and the concave portion has a concave curved surface for holding the bent portion. The heat exchanger for a cooling tower according to claim 1 or 2, characterized in that the heat exchanger is formed so as to be convexly curved toward the side plate and to prevent contact between the inserted U vent pipe and the support side plate. 4. A heat exchanger for a cooling tower according to claim 1, wherein said pair of support side plates and said electrically insulating support member are integrally formed of a synthetic resin molded product. 5. A closed heat exchanger comprising a cooling coil forming a circulating cooling water passage meandering in a plane by connecting pipes with a U-vent pipe is supported by a pair of supporting side plates substantially horizontally in upper and lower stages. The circulating water supply port of the closed type heat exchanger is connected to a common supply header, and the circulating water discharge port is a cooling tower having a heat exchanger connected to a common discharge header. On the inner surface, electrically insulating supporting members for U vent pipes are provided in upper and lower multi-stages, and the recesses for holding the outer sides of the bent portions of each U vent pipe in the hermetically sealed heat exchanger of each stage from above, below, left and right are formed by the pair. Are formed on opposing inner surfaces of the electrically insulating supporting member, and the outside of the U vent pipe is inserted into the recess from the inside of the recess, and the closed heat exchanger is supported by a supporting side plate. A cooling tower. 6. The electrically insulating support member is made of a synthetic resin.
The cooling tower according to claim 5, wherein each U vent pipe of the heat exchange coil is made of metal. 7. The cooling tower according to claim 5, wherein said pair of supporting side plates and said electrically insulating supporting member are integrally formed of a synthetic resin molded product. 8. The electrically insulating support member is made of a channel material having a U-shaped cross section, the holding dent corresponds to the outer surface of the bent portion, and the holding dent is formed as a concave curved surface. The cooling tower according to claim 5, 6 or 7, wherein the cooling tower has a curved surface that is convex toward the support side plate and has a shape that prevents contact between the inserted U vent pipe and the support side plate.