JPH0517478B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial field to which the invention is applied> The present invention provides an evaporative closed cooling tower that cools a liquid flowing inside a coiled closed heat exchanger assembly in a state where it is isolated from the atmosphere. The present invention relates to an assembly of a closed heat exchanger for use in and a method for manufacturing the same.

<Background Art> Various types of closed heat exchanger assemblies of this type have been developed before the filing of this application and can be found on the market.
As described in Japanese Utility Model Publication No. 53-3687, the required number of coil units 13 are stacked to form a sag-shaped coil unit 13 by directly supporting the folded portions 12 on both sides of the serpentine coil 11 on a pair of frame members 10, The desired closed type heat exchanger (see Figure 8) has attracted the attention of users due to its ease of assembly and the large degree of freedom in design for the required cooling load. More and more companies are moving into the industry of evaporative closed cooling towers with exchanger assemblies.

<Problems to be Solved> In the prior art, one flat coil unit 13 is stacked in multiple stages, so there is still room for improvement in the assembly, and the frame body 10
and both side folded portions 12 of the surventine coil 11
With use, a galvanic corrosion phenomenon occurs at the contact part due to the potential difference between the different metals of this frame 10 and the folded part 12, and pinholes are generated in this contact part, causing leakage of the liquid to be cooled. The life of the heat exchanger assembly is shortened.

<Means for solving the problems> The present invention solves the problems of the conventionally developed closed heat exchanger assemblies by blocking the cooled liquid flowing inside the coiled closed heat exchanger assembly from the atmosphere. In a closed type heat exchanger assembly used in an evaporative closed type cooling tower that cools the air in a closed state, the heat exchanger assembly is arranged in a layered manner between a pair of left and right support side plates or support frames, each of which is positioned approximately horizontally. The liquid supply ends and discharge ends of all of the plurality of sealed heat exchange coils arranged in a common vertical header are removably attached to a common vertical header, and each of the heat exchange coils is connected to its straight pipe. It is supported without contact by a pair of left and right support side plates or a support frame via a common pair of left and right electrically insulating spacers assembled at each joint of the U-shaped tube part and the U-shaped curved pipe part. By adopting the characteristic closed heat exchanger assembly and manufacturing method used in evaporative closed cooling towers, this problem can be solved by using a modular closed heat exchanger assembly that has the basic cooling capacity among the commonly used cooling capacities. The main object of the present invention is to provide a type heat exchanger assembly and a method for manufacturing the same.

<Embodiments> Next, typical embodiments of the present invention will be described based on the drawings.

In FIGS. 1 to 5, A is a closed heat exchanger assembly, in which a pair of left and right support side plates or support frames 20 are arranged approximately horizontally. A plurality of closed heat exchange coils (that is, serpentine coils) 30 are arranged in a hierarchical manner between the frames 20, and the cooled water supply ends 31 and discharge ends 3 of all of these heat exchange coils 30
2 are removably attached to common vertical headers 33 and 34, respectively, thereby forming the main part of the heat exchanger assembly A.

In the sealed heat exchanger assembly A of the first invention, each of the heat exchange coils 30 is assembled to each joint part B of the straight pipe part 35 and the planar U-shaped curved part 36 (i.e., folded part). It is supported in a non-contact manner by the pair of left and right support side plates or support frames 20 via a pair of left and right electrically insulating spacers 40 . To explain its form more specifically, the spacer 40 is made of an elongated member with a cross-sectional shape, and the spacer 40 is made of an elongated member with a cross-sectional shape, and when the spacer 40 is opened toward the support side plate or the support frame 20, Cooled liquid supply end 31 of the heat exchange coil 30 assembled to the inner wall
One spacer 40 is stored in each spacer receiving member 21 from the longitudinal direction in the spacer receiving member 21, which is a channel member with a horizontally long cross section, which is slightly inclined and fixed hierarchically with the side higher than the discharge end 32. and the holding claws 2 on the outer edge of the spacer receiving member 21
2 is held from above and below. In the vertical wall 41 of each spacer 40, a predetermined number (14 in the embodiment) of small holes 42 corresponding to the diameter of the straight pipe portion 35 of the heat exchange coil 30 are provided at equal intervals in the width direction.
At each small hole 42 position, each joint part B of the straight pipe part 35 of the heat exchange coil 30 and the curved part 36 is supported by a spacer 40 at intervals in the vertical and horizontal directions, and each curved part 36. The straight pipe portion 35 does not directly contact the support side plates or the support frame 20, and the heat exchange coil 30 is inserted between the left and right pair of support side plates or the support frame 20 via the spacer 40.
A predetermined number (for example, six) are supported in multiple stages.

At this time, the outer peripheral surface of the curved portion 36 of the heat exchange coil 30 extending from the vertical wall 41 of the spacer 40 toward the inner surface of the supporting side plate or the supporting frame 20 is connected to the tube end gutter 23 provided at the inner part of the channel member 21. It is supported almost horizontally without contact.

Note that the shape of the spacer 40 is not limited to the character-shaped elongated member of the embodiment, but may be L-shaped, and in short, the heat exchange coil 30 is supported on the left and right pair of support side plates or the support frame 20 without contact. As long as the structure is functional, its outline shape does not matter.

Further, the material of the spacer 40 may be a commonly used vinyl chloride resin board or other synthetic resin board, and is not particularly limited as long as it has electrical insulation properties.

The number of heat exchange coils 30 is set to be sufficient for the heat exchanger assembly A to exhibit its basic cooling capacity.

A method of manufacturing the sealed heat exchanger assembly A having the above configuration will be described next.

First, a large number of straight pipes 35 and curved pipes having a planar U-shape for connecting these straight pipes 35 are prepared in a number corresponding to the desired heat exchange coil 30.

A predetermined number of these straight pipes 35 are arranged in parallel at equal intervals on the same horizontal plane, and both ends of each straight pipe 35 are separated by vertical walls 41 of electrically insulating spacers 40 made of elongated material with a cross-sectional shape. A pair of left and right common spacers 40 are fitted inside both ends of each straight pipe 35 by inserting them into small holes 42 drilled at equal intervals in the horizontal direction,
These spacers 40 allow a predetermined number of straight pipes 35
The pipes are maintained at equal intervals.

At this time, in addition to projecting horizontally from the vertical wall 41 of each spacer 40, the lower jaws 43 and 44 are directed outward from each other.

Among the plurality of straight pipes 35 held in this way, the ends of adjacent straight pipes 35 are shifted one by one on the left and right and are successively connected by the curved pipes 36 (for example, by brazing) to form a watertight joint. Part B is formed as a heat exchange coil 30 having a zigzag meandering liquid passage to be cooled.

A plurality of such heat exchange coils 30 are manufactured in a number suitable for the sealed heat exchanger assembly A to be assembled and manufactured to sufficiently exhibit the basic cooling capacity.

On the other hand, a support side plate or a support side frame 20 is provided in which channel members 21 having a square cross section and forming shelf-shaped spacer receiving members are provided on the inner surface at hierarchical intervals with openings 24 facing inward. Manufacture and prepare a pair of left and right.

When assembling a plurality of heat exchange coils 30 to the pair of left and right support side plates or support side frames 20, first, the pair of heat exchange coils 30 are fitted into the center of each straight pipe 35 of each heat exchange coil 30. The spacers 40 are moved in the longitudinal direction to the positions of the joint portions B at each end of the straight pipe.

The heat exchange coil 30 with the spacers 40 arranged in this way is attached to the support side plate or the support frame 20 with the spacers 40
A predetermined number of pieces are sequentially assembled in a non-contact manner in a hierarchical manner at intervals.

That is, the spacer 40 is housed so as to be slid from the width direction into the spacer receiving member 21 made of a channel member that forms a part of the corresponding support side plate or support frame 20, and In between, each heat exchange coil 30 is stacked and supported at a fixed height of each spacer receiving member 21 at regular intervals from bottom to top, and a pair of spacers 40 on the left and right sides of the heat exchange coil 30 are stacked on each spacer receiving member 21. It is held by the holding claws 22 on the outer edge (see Fig. 5),
A predetermined number of heat exchange coils 30 are fixed and held in a hierarchical manner between a pair of left and right support side plates or support frames 20 while preventing movement of the straight pipes 35 of the heat exchange coils 30 in the axial direction.

At this time, the curved tube 36 portion of the heat exchange coil 30 is separated from the gutter 23, which is the rear upright inner surface of the spacer receiving member 21, and the straight tube 35 portions are not in contact with the holding claws 22 of the channel member 21. , the upper and lower holding claws 22 form an upper and lower middle position of the opening 24, and each heat exchange coil 30 is attached to the left and right pair of support side plates or the support frame 2 in a non-contact manner via a spacer 40.
It will be supported almost horizontally between zero.

Cooled liquid supply end 31 of these heat exchange coils 30
are set in the same position and in the same direction, and formed to be detachable from a common vertical supply header 33,
Further, the cooled liquid discharge end 32 is connected to the supply end 31.
It is set at the same position and in the same direction on the opposite side, and is also formed to be detachable from a common vertical discharge header 34, with the discharge end 32 side being lower than the supply end 34 side. The closed heat exchanger assembly A is obtained which includes a desired number of heat exchange coils 30 horizontally. Unions are used to removably connect each heat exchange coil 30 to the supply header 33 and discharge header 34.

<Function and Method of Use> The function of the closed heat exchanger assembly A of the present invention constructed as described above will be described below along with the method of use.

(a) When using the heat exchanger assembly A in a cross-flow closed type cooling tower. <See Figure 6> Depending on the cooling capacity required for the cross-flow type closed cooling tower C, one or more heat exchanger assemblies A of the present invention may be installed on the outside air intake side of the cooling tower main body 50. The coolant discharge end 32 is located, and the heat exchange coil 30
are arranged horizontally across the air passage, below the upper water tank 51 of the cooling tower, and on the lower water tank 52, and the discharge end 32 and supply end 31 of the heat exchange coil 30 of these assembly A are connected to each other. The liquid to be cooled is connected to a common vertical supply header 33 and a discharge header 34, and the liquid to be cooled is supplied all at once from the vertical supply header 33 to the heat exchange coils 30 arranged vertically in a hierarchical manner, circulated in a zigzag pattern, and then connected to the common discharge header 33. It is sent from the header 34 to a refrigerator, etc.

During this circulation, the outside air flowing between the heat exchange coils 30 and the spray water sprayed onto the heat exchange coils 30 from the upper water tank 51 are brought into indirect contact with the liquid to be cooled circulating within the heat exchange coils 30. , performs a heat exchange function similar to that of the conventional closed type cooling tower C to cool the liquid to be cooled.

At this time, each heat exchange coil 30 is supported by a pair of left and right support side plates or support frames 20 via spacers 40, so even if the support side plates or support frames 20 of the heat exchange coils 30 are made of different metals, these Since no current flows during this period, corrosion due to the galvanic phenomenon does not occur in the heat exchange coil 30 and the support side plates or the support frame 20 during use.

(b) When used in counter-current closed type cooling tower D. <Refer to FIG. 7> The straight pipe portion 35 of the heat exchange coil 30 is substantially vertical or horizontal, and a water sprinkler 60 and a water tank 6 are connected to each other.
1, a predetermined number of the heat exchanger assemblies A are installed in the cooling tower main body 62 and interconnected, and the liquid to be cooled circulating in each heat exchange coil 30 and the water sprayed from the water sprinkler device 60 are connected to each other. , heat exchange coil 30
Heat exchange is performed between the external air blowing upward through the cooling tower D, and the liquid to be cooled is cooled.

In this case, a predetermined number of heat exchange coils 30 are supported by spacers 40 at vertical intervals between the support side plates or support frames 20 located above and below, as described in the above section (a), and the heat exchange coils 30 are 3
Corrosion does not occur in the joint part B of 0.

When these cooling towers C and D are installed and in use, dirt adheres to the heat exchange coil 30 and between the adjacent heat exchange coils due to aerobic bacteria contained in the sprayed water, and the sprayed water and outside air If some of the heat exchange coils 30 are deformed or damaged due to interference with the flow of water, dust from the outside, or long-term use,
Reverse the manufacturing and assembly procedure described above, remove the supply header 33 and discharge header 34 that are connected vertically, pull out the sealed heat exchanger assembly A as a unit from each spacer receiving member 21, and then remove the heat exchanger coil 3.
0 and spacer 40, and heat exchange coil 30.
If the tube is damaged, cut it off and braze a new tube, or separate it from the new removable connection and replace it with the already assembled heat exchange coil with a spacer, then reinstall the spacer. Each spacer is slid into the receiving member 21 and the supply and discharge headers 33, 34 are connected again to complete the repair or cleaning.

<Effects of the present invention> In the present invention configured, operated and used as described above, the effects of the heat exchanger assembly A of the first invention are as follows: The exchange coils 30 are arranged in a layered manner between a pair of left and right support side plates or support frames 20, and the total heat exchange coils 3
Since the supply end and discharge end of the liquid to be cooled of 0 are removably installed on a common vertical header, the basic cooling capacity can be adjusted by appropriately selecting the number of heat exchange coils 30. A modular sealed heat exchanger assembly A can be obtained, and various cooling capacities can be achieved by sequentially connecting the heat exchanger assemblies A vertically and horizontally according to the desired cooling capacity. A production line for heat exchanger assembly A, its inventory management,
Assembly and repair can be performed easily.

Since each joint portion B between the straight pipe portion 35 and the U-shaped curved portion 36 of the heat exchange coil 30 is supported by the common pair of left and right spacers 40, a large number of straight pipe portions 35 are supported by the pair of left and right spacers 40. The spacers 40 allow them to be fixed and held in parallel at intervals, and the heat exchange coil 30, and thus the heat exchanger assembly A, can be constructed with a small number of parts.

Next, since each heat exchange coil 30 is supported via an electrically insulating spacer 40 without directly contacting the pair of left and right support side plates or the support frame 20, the heat exchange coil 30 and the support side plates or the support Frame 2
0 dissimilar metals are not connected, there is no galvanic corrosion phenomenon that occurs on the contact surfaces between metals with different potentials, and pinholes are generated in the joint portion B of the heat exchange coil 30, and the heat exchanger coil 30 is free from the heat exchanger coil 30. This eliminates accidents where the coolant leaks into the spray water, and the heat exchange coil 30 is made of a material with high thermal conductivity made of a different metal or a metal with a different potential from the support side plate or the support frame 20.
The material can be selected and used regardless of the material of the supporting side plates or the supporting frame 20, and the desired heat exchange effect can be obtained.

The advantage of the method for manufacturing a heat exchanger assembly A of the second invention is that, in addition to being able to manufacture the heat exchanger assembly A that exhibits the above-mentioned effects, a large number of straight pipes 35 are passed through the small holes 42 of each spacer 40. In order to sequentially connect the ends of the adjacent straight pipes 35 on the same side with the curved pipes 36 in a state where they are brought to the center and form a cooled liquid passage that meanders in a zigzag manner, the spacer 40 is installed during assembly.
This meandering liquid passage to be cooled can be formed without being obstructed by the spacers 40, and the relative positions of the straight pipes 35 are regulated by a pair of left and right spacers 40, and the spacers 40 support these straight pipes 35 at intervals parallel to each other. Since the curved pipe 36 and the straight pipe 35 are connected in this state, the spacer 40 is
It has the effect of a kind of jig and improves the efficiency of assembly work.

Furthermore, when the straight pipe 35 and the curved pipe 36 are connected, it is possible to obtain a heat exchange coil 30 that integrally has a pair of left and right spacers 40, and the spacer 40 does not separate from the straight pipe 35 after this connection. By simply sliding and holding the spacer 40 in the spacer receiving member 21 of the support side plate or support frame 20 as described above, a predetermined number of heat exchange coils 30 can be arranged between the left and right pair of support side plates or the support frame 20 in an upper and lower layered manner. It is possible to securely support it almost horizontally.

<Effects of the Embodiment> If the spacer 40 is made of vinyl chloride, the spacer 40 that exhibits the functions and effects described above can be manufactured at low cost.

The spacer 40 is made of an elongated member having a U-shaped cross section, and the spacer receiving member 21 for selling the spacer 40 is fixed to the support side plate or the inner wall of the support frame 20.
The spacer 40 is gripped from above and below by the upper and lower gripping claws 22, 22 on the outer edge of the channel member 21 having a shaped cross section.
can be stored and held in this channel member 21, and a pair of left and right spacers 40 and a pair of upper and lower gripping claws 22, 2 of this channel member 21.
2, the longitudinal direction of the heat exchange coil 30,
That is, it is possible to prevent the straight pipe portion 35 from moving in the axial direction,
The heat exchange coil 30 can be placed in a predetermined position.

Furthermore, this channel member 20 and spacer 40
By having such a cross-sectional shape, all of the curved pipe portions 36 of the heat exchange coil 30 are located within the channel member 21, and are sufficiently protected.

Furthermore, since the spacer 40 is slidable in the width direction of the channel member 21, the spacer 40, that is, the heat exchange coil 30, can be set at a convenient position for dispersion, and its assembly and repair work is also easy. becomes.

The discharge end 32 side of each heat exchange coil 30 is
In an embodiment in which the discharge end 32 is located at a position slightly lower than the supply end 31 side, and the discharge end 32 is located at the side of the cross-flow type cooling tower and the outside air intake, and this supply end 36 is located at the side of the cooling tower and the blower, the outside air intake Sprayed water sprayed near the inlet moves inward due to ventilation from the outside air intake side, which eliminates the lack of cooling capacity. It can be cooled evenly by applying the air to the blower side.

[Brief explanation of the drawing]

The figures relate to the present invention; FIG. 1 is a front view of a typical embodiment of the closed heat exchanger assembly of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a plan view of FIG. 4 is a cross-sectional view of FIG. 3, and FIG. 5 is a partially omitted enlarged front view of the heat exchange coil in the heat exchanger assembly shown in FIG. FIGS. 6 and 7 are schematic diagrams showing an example of its use; FIG. 8 is a perspective view of a conventional heat exchange coil unit. Explanation of main symbols in the figure: 20...Support side plate or support frame, 30...Heat exchange coil, 40...Spacer, A...Closed heat exchanger assembly.

Claims (1)

[Scope of Claims] 1. A closed heat exchanger assembly for use in an evaporative closed cooling tower that cools a liquid to be cooled flowing inside the coil-shaped closed heat exchanger assembly while being isolated from the atmosphere, comprising: The exchanger assembly includes a plurality of closed heat exchange coils arranged in a hierarchy between a pair of left and right support side plates or support frames, each of which is positioned approximately horizontally. Each of the heat exchange coils is equipped with a common vertical header in a detachable manner, and each of the heat exchange coils has a common left and right pair of electrically insulated coils attached to each joint of the straight pipe section and the U-shaped curved pipe section. 1. A closed heat exchanger assembly for use in an evaporative closed cooling tower, characterized in that it is supported in a non-contact manner by a pair of left and right support side plates or support frames via a spacer. 2. A closed heat exchanger assembly for use in an evaporative closed cooling tower according to claim 1, wherein the spacer is made of synthetic resin such as vinyl chloride. 3. The spacer is made of an elongated member with a cross-sectional shape, and a spacer receiving member with a horizontally long cross-section is provided protruding from the inner wall of the support side plate or support frame, with its opening facing toward the support side plate or support frame. The evaporative sealed type according to claim 1 or 2, wherein the heat exchange coil is housed in the heat exchanger and is supported substantially horizontally on a pair of left and right support side plates or support frames via the spacer. Closed heat exchanger assembly used in cooling towers. 4 The cooled liquid discharge end side of each heat exchange coil is slightly lower than the cooled water supply end side, and the entire heat exchange coil is tilted between the pair of left and right support side plates or support frames. The evaporative closed cooling tower according to claim 3, wherein the discharge end is located on the outside air intake side of the cross-flow cooling tower, and the supply end is located on the blower side of the cooling tower. Closed type heat exchanger assembly used for. 5 Regarding the manufacture of a closed heat exchanger assembly for use in an evaporative closed cooling tower that cools the liquid to be cooled flowing inside the coiled closed heat exchanger assembly in a state where it is isolated from the atmosphere, first, a large number of straight pipes are used. , a process of preparing U-shaped curved pipes in a number corresponding to the desired heat exchange coil in order to connect these straight pipes in parallel in a plane, and a process of preparing a number of U-shaped curved pipes corresponding to the desired heat exchange coil, and a process of preparing a predetermined number of these straight pipes in parallel and connecting them at both ends of the straight pipes. a step of fitting a pair of electrically insulating common spacers inside the left and right spacers, and connecting the ends of the U-shaped curved pipe on the same side as the adjacent straight pipes supported at a predetermined distance by the pair of left and right spacers; A step in which a plurality of such heat exchange coils are manufactured, and the spacers located on both sides of each heat exchange coil are connected one after another to form a heat exchange coil having a meandering liquid passage to be cooled. The spacers of each heat exchange coil are placed near the joints of the parts, and each spacer of each heat exchange coil is placed on a shelf-like spacer receiving member that protrudes inward in a hierarchical manner at intervals on the vertical support side plate or inside the support frame. a step of supporting and fixing a plurality of heat exchange coils in a hierarchical manner almost horizontally at vertical intervals via the spacer without contacting the supporting side plates or the support frame by slidingly holding each one; The cooled liquid supply end of each heat exchange coil is set at the same position and in the same direction, and is formed to be detachable from a common vertical supply header, and the cooled liquid discharge end is connected to the supply end. A closed-type heat exchanger for use in an evaporative closed-type cooling tower characterized by comprising the steps of: setting the same position and the same direction on the opposite side, and forming the header so that it can be attached to and detached from a common vertical discharge header; Method of manufacturing an exchanger assembly. 6. A closed heat exchanger assembly for use in an evaporative closed cooling tower according to claim 5, wherein the coolant supply end of these heat exchange coils is located at a slightly higher level than the coolant discharge end. Production method. 7. The method of manufacturing a closed heat exchanger assembly for use in an evaporative closed cooling tower according to claim 5 or 6, wherein the spacer is made of synthetic resin such as vinyl chloride. 8. The spacer is formed by cutting a cross-sectional elongated material into a predetermined width dimension, and the spacer is provided protruding from the inner wall of the support side plate or support frame with the opening of the spacer facing toward the support side plate or support frame. Claim 5: This spacer is housed and held in a channel member having a cross-sectional shape long in the horizontal direction, and the heat exchange coil is supported almost horizontally on a pair of left and right support side plates or support frames via the spacer. A method for manufacturing a closed heat exchanger assembly for use in an evaporative closed cooling tower according to item 6 or 7.