JPH0581827B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an evaporative closed cooling tower that cools circulating cooling water flowing inside a coiled closed heat exchanger assembly in a state where it is isolated from the atmosphere. .

<Prior art> Various heat exchangers used in this type of closed cooling tower have been developed and can be found on the market before this application, but as described in Japanese Utility Model Publication No. 53-36857, a heat exchanger with a pair of frame members is used. Serpentine coil 11 to 10
It is easy to assemble the coil unit 13 by directly supporting the folded portions 12 on both sides, stacking the necessary number of coil units 13 to form the desired closed type heat exchanger (see Fig. 8). This type of heat exchanger assembly tower-mounted evaporative closed-type cooling tower has attracted the attention of users due to its advantage of having a large degree of design freedom in response to the required cooling load. is increasing.

<Problems to be Solved by the Invention> In the prior art described above, since one flat coil unit 13 is stacked in multiple stages, there is still room for improvement in the assembly, and the frame body 1
During use, a galvanic corrosion phenomenon occurs at the contact portion between the folded portions 12 on both sides of the frame 10 and the folded portions 12 of the frame 10 and the folded portion 12, resulting in a pinhole in this contact portion. This causes leakage of the liquid to be cooled, shortening the life of the heat exchanger assembly.

The object of the present invention is to provide on the market an evaporative type closed cooling tower that improves the above-mentioned problems by using a spacer with a simple structure.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides an evaporative closed-type heat exchanger that cools circulating cooling water flowing in a coil-shaped closed-type heat exchanger in a state where it is isolated from the atmosphere. In the cooling tower, the heat exchanger has a generally rectangular parallelepiped shape and is supported by a pair of left and right support frames in the cooling tower through an electrically insulating spacer without contacting the support frames. consists of a plurality of closed heat exchange coils arranged hierarchically at the outside air intake of the cooling tower, and each of the heat exchange coils is arranged with its supply end slightly higher than its discharge end with respect to the horizontal line. The spacers are arranged parallel to each other on the cooling tower support frame at a predetermined angle, and the spacer is made of an elongated member with a cross-sectional shape, and a channel with a shaped cross-section is fixed to the inner wall of the support frame as a spacer receiving member. The spacer is slidably housed in the channel member from the width direction, and the heat exchange coil is housed in multiple stages between the pair of left and right support frames via the spacer, and the pair of left and right spacers C are heated. This is an evaporative closed type cooling tower characterized by being commonly fitted and attached to a group of straight pipes of an exchange coil and covering all joints between the straight pipes and the curved pipes.

<Example> Next, a typical example of the present invention will be described based on the drawings.

In FIG. 1, A indicates the entire evaporative cross-flow closed type cooling tower. A closed heat exchanger B is installed.

This heat exchanger B has an overall rectangular parallelepiped shape, and has an electrically insulating (for example, made of vinyl chloride resin) spacer C.
At the upper part of the outside air intake port 23 of the cooling tower A,
Support frame D fixedly installed at intervals within the cooling tower main body
It is supported in a non-contact manner.

The heat exchanger B consists of a number of heat exchange coils 30 corresponding to the basic cooling capacity, and each heat exchange coil 30 has a plurality of mutually parallel straight pipes 31 and the ends of these straight pipes 31 are connected, A plurality of U-shaped curved pipes 32 forming a circulating cooling water passage that snakes in a zigzag manner.
The pair of left and right common spacers C that fit into these straight pipes 31 are made of elongated vinyl chloride material and have a cross-sectional shape. The spacers C are supported substantially horizontally and parallel to each other at intervals, and each spacer C is set at a position so as to cover all the joint portions of the straight pipe 31 and the curved pipe 32 located at the left and right ends.

On the opposing inner surfaces of the pair of left and right support frames D, a number of spacer receiving members 40 corresponding to the number of heat exchange coils 30 are made of cross-sectional channel members and are fixed integrally at hierarchical intervals. In addition, each spacer receiving member 40 is arranged substantially horizontally in the width direction of each support frame D.

A pair of left and right spacers C of each heat exchange coil 30 are slidably accommodated from the width direction in each spacer receiving member 40 of the pair of support frames D common to the left and right, and the straight pipe 31 and the curved pipe of each exchange coil 30 are housed. 32, a predetermined number of heat exchange coils 3 are arranged vertically and hierarchically in parallel to each other without directly contacting the support frame D.
0 is installed and supported between a pair of left and right cooling tower support frames D via the spacer C.

At this time, the circulating cooling water supply ends 33 of all the heat exchange coils 30 are placed on the blower 24 side of the cooling tower A.
Further, the discharge end portion 34 is located on the outside air intake port 23 side, and is connected to a common vertical header 35, 36, respectively.
The circulating cooling water supplied to the supply side header 35 is connected to the supply end 3 by a union joint.
3, the circulating cooling water is distributed to all the heat exchange coils 30 and flows in opposition to the air flow taken in from the outside air intake port 23, and the cooled circulating cooling water is discharged from the discharge end 33 to the discharge side header 36. Structurally, the heat exchanger B is configured (see FIG. 3).

Each of the heat exchange coils 30 is arranged on the support frame D so that its supply end 33 is slightly higher than the discharge part 34 and is inclined at a desired angle with respect to the horizontal. A large number of filling plates 40 are arranged between the exchange coils 30.

One or more heat exchangers B are installed in the cooling tower main body 20 in accordance with the designed cooling capacity of the cooling tower A and are arranged in communication with each other.

Instead of the embodiment of the cross-flow closed type cooling tower A, in the case of the counter-current closed type cooling tower E, the straight pipe portion 31 of the heat exchange coil 30 is substantially vertical or horizontal, and the water sprinkler 60 and the water tank 61 are installed. A predetermined number of the heat exchangers B are installed in the cooling tower main body 62 between the cooling tower bodies 62 and are arranged in communication with each other.

<Function> The function of the cooling tower of the present invention configured as described above will be explained below along with the method of use.

For example, in the present cross-flow type closed cooling tower A, heat exchange is performed with the circulating cooling water that circulates in the heat exchanger B without contact with the outside air taken in from the outside air intake port 23 as before, and The air, whose temperature has risen, is cooled by contact with the sprayed water sprayed onto the heat exchanger B from the upper water tank 21 and by latent heat action, and by repeatedly undergoing such heat exchange, the circulating cooling water reaches a predetermined temperature. At the same time, since the joint portion between the straight pipe 31 and the curved pipe 32 of the heat exchange coil 30 is supported and covered by the spacer C, the joint portion between the straight pipe 31 and the curved pipe 32 is The galvanic corrosion phenomenon described above does not occur.

During use of this cooling tower, aerobic bacteria contained in the spray water may cause the support frame D to
The heat exchange coil 30 of the heat exchanger B supported by
and dirt has adhered between adjacent heat exchange coils 30, obstructing the flow of sprayed water and outside air, or some heat exchange coils 30 have been deformed or damaged due to dust entering from the outside, or due to long-term use. In this case, a common vertical header 35,3
6 and heat exchanger B, and
unit, remove this heat exchanger B from the pair of left and right support frames D, clean the heat exchange coil 30 and spacer C, and if the heat exchange coil 30 is damaged, cut that part and install a new one. Either connect them by brazing, or replace the already assembled heat exchange coil 30 with a new spacer C, slide each spacer C into the spacer receiving member 40 of the support frame D again, and repeat the above-mentioned supply and discharge. Side header 35,3
Connect this heat exchanger B to 6 and complete the repair or cleaning.

<Effects> Since the present invention is constructed and used as described above, it produces various effects as follows.

Since the heat exchanger B is almost entirely rectangular and is supported by the cooling tower support frame D via the spacer C, the cooling capacity of the heat exchanger B is designed as a module by connecting and arranging a predetermined number of them in series or parallel. An evaporative closed-type cooling tower having cooling capacity can be easily obtained, and the production line for heat exchanger A, its inventory management, assembly, and repair can be easily performed.

In addition, the support frame D is connected via the electrically insulating spacer C.
Since the heat exchange coil 30 of the heat exchanger B is supported in a non-contact manner, the heat exchange coil 30 of the heat exchanger B and dissimilar metals of the support frame D do not come into contact with each other, and the contact surface between metals with different potentials does not come into contact with each other. There is no galvanic corrosion phenomenon that occurs in the heat exchanger B, no pinholes are generated at the joint between the straight pipe 31 and the curved pipe 32 in the heat exchange coil 30 of the heat exchanger B, and the circulating cooling water that circulates inside the heat exchange coil 30 is completely free of pinholes. A material with high thermal conductivity that is able to prevent accidents that spill into the spray water and is a different metal or a metal with a different potential from that of the cooling tower support frame D is used as the material for the heat exchanger B, regardless of the material of the support frame D. It can be selected and used to obtain the desired heat exchange effect.

The discharge end 34 side of each heat exchange coil 30 is
By arranging the heat exchange coils 30 in parallel with each other at a position slightly lower than the supply end 33 side and inclined at a predetermined angle with respect to the horizontal line, the cooled water cooled to a predetermined temperature can be smoothly transferred from the heat exchange coil 30. It can be led out to a load section (for example, a refrigerator).

The spacer C is an elongated member with a cross-sectional shape,
A channel portion having a shaped cross section is fixed to the inner wall of the support frame D as the spacer receiving member 40, and the spacer C is slidably housed in this channel member from the width direction, thereby forming a space between the pair of left and right support frames D. The heat exchange coils 30 can be stored and held in multiple stages via the spacers C, and since the left and right pair of spacers C are commonly fitted and attached to the straight pipes 31 of the heat exchange coils 30 as described above, the spacers C and the The sliding engagement of the spacer receiving member 40 prevents the heat exchange coil 30 from moving in the longitudinal direction, that is, in the axial direction of the straight pipe 31, and allows the heat exchange coil 30 to be placed in a predetermined position within the cooling tower main body 20. .

By making the spacer C and the spacer receiving member 40 have the above-mentioned cross-sectional shape, the spacer C can be moved relative to the spacer receiving member 40 in the width direction, and the spacer C can be placed in a suitable position for spraying with spray water. That is, the heat exchange coil 30 can be set, and its assembly and repair work can be facilitated.

<Effects Unique to the Embodiment> If the spacer C is made of vinyl chloride resin, the spacer C exhibiting the functions and effects described above can be manufactured at low cost.

The circulating cooling water supply ends 33 of all the heat exchange coils 30 are located on the blower 24 side of the cooling tower A, and the discharge ends 34 thereof are located on the outside air intake port 23 side. It is possible to prevent the water sprayed toward the outside air intake port 23 from moving inward due to the ventilation from the outside air intake port 23 side, resulting in insufficient cooling. Uniform cooling can be achieved from the side to the blower 24 side.

[Brief explanation of the drawing]

The figures relate to this invention; FIG. 1 is a schematic front view of a typical embodiment of the cooling tower of this invention, and FIG.
3 is a partially omitted front view showing an embodiment of this heat exchanger, and FIG. 4 is a schematic front view similar to FIG. 1 of another embodiment, and FIG. A cross-sectional view with parts omitted; Figure 5 is a left side view of Figure 4;
FIG. 6 is an enlarged end view showing a joint portion of a heat exchange coil, FIG. 7 is an enlarged cross-sectional view of FIG. 6, and FIG. 8 is a perspective view of a conventional heat exchange coil unit. Explanation of main symbols in the figure, B...Heat exchanger, 30
...Heat exchange coil, C...Spacer, D...Support frame.

Claims (1)

[Claims] 1. In an evaporative closed cooling tower that cools circulating cooling water flowing through a coiled closed heat exchanger in a state where it is isolated from the atmosphere, the heat exchanger is generally rectangular as a whole. The heat exchangers are supported by a pair of left and right support frames of the cooling tower through electrically insulating spacers in a non-contact state with the support frames, and the heat exchangers are arranged in a plurality of layers hierarchically at the cooling tower outside air intake. Each of the heat exchange coils is arranged parallel to the cooling tower support frame at a predetermined angle with respect to the horizontal, with the supply end slightly higher than the discharge end. The spacer is made of an elongated member with a cross-sectional shape, and a channel with a shaped cross-section is fixed to the inner wall of the support frame as the spacer receiving member, and the spacer is slid into the channel member from the width direction. The heat exchange coils are movably stored and held in multiple stages via spacers between a pair of left and right support frames, and a pair of left and right spacers C are commonly fitted and attached to the straight pipe groups of the heat exchange coils. An evaporative closed type cooling tower characterized by covering all joints of straight pipes and curved pipes.