JPS61173078A - Emclosed type heat exchanger assembly used for evaporation system enclosed type cooling tower and manufacturing thereof - Google Patents

Abstract

PURPOSE:To obtain a cooling tower having various cooling functions irrespective of the form of counterflow or straight flow and to make it possible to easily carry out the manufacture line, stock management, assembly and repair, by disposing a plurality of heat exchange coils in a step-like manner between support frames, and providing supply end portion and discharge end portions on a common header in an attachable and detachable manner. CONSTITUTION:A pair, right and left, of support side plate or support frames 20 are disposed substantially horizontally. Between these support side plates or support frame 20 are disposed enclosed type heat exchange coils 30 in a step-like manner. Supply end portions 31 for water to be cooled and discharge end portions therefore of the heat-exchange coils 30 are mounted on vertical headers 33 and 34 in an attachable and detachable manner. Respective heat exchange coils 30 are supported by a pair, right and left, of support side plates or support frames 20 in non-contact manner via a pair of electric insulative spacers 40 assembled in respective joint parts B of straight tubular part 35 and planar U-shaped curved parts 36. Further, the material for the spacers 40 is not particularly limited if it is provided with an electric insulative property.

Description

[Detailed description of the invention] <Industrial fields in which the invention can be applied> The present invention is an evaporative closed type heat exchanger that cools a liquid flowing inside a coiled closed type 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 used in a cooling tower and a method for manufacturing the same.

<Background technology> Various types of closed heat exchanger assemblies of this type have been developed and can be found on the market before this application was filed, but
As described in Japanese Patent No. 687, a pair of frame members 10 directly support the folded portions 12 on both sides of the serpentine coil 11 to form a sag-shaped coil unit 13, and a necessary number of coil units 13 are stacked one on top of the other to form a desired sealed type. The heat exchanger (see Figure 8) has attracted the attention of users due to its ease of assembly and the large degree of design freedom for the required cooling load, and this type of heat exchanger assembly has become popular. An increasing number of companies are entering the industrial field of tower-mounted evaporative closed cooling towers.

Problems to be Solved> In the prior art, since the flat coil units 13 are stacked in multiple stages, there is still room for improvement in the assembly, and the frame body 10 and the surventine coil 11 are As the frame body 10 and the folded portions 12 are used, a galvanic corrosion phenomenon occurs at the contact portions of the folded portions 12 on both sides due to the potential difference between different metals of the frame body 10 and the folded portions 12, pinholes are generated in the contact portions, and the liquid to be cooled is This causes leakage and shortens the life of the heat exchanger assembly.

Means for Solving the Problems The present invention solves the problems of the conventionally developed closed heat exchanger assemblies by isolating 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 in a state of The coolant 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 tube. 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 to each joint of the U-shaped groove tube section and the U-shaped groove tube section. The adoption of the closed heat exchanger assembly and its manufacturing method for use in evaporative closed cooling towers has been eliminated from K, and it has been modularized to provide the basic cooling capacity among the general-purpose cooling capacities. The main object of the present invention is to provide a closed heat exchanger assembly and a method for manufacturing the same.

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

In Figures 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 horizontally, and these pair of support side plates or support frames 20 are arranged horizontally. A plurality of closed heat exchange coils (i.e., serpentine coils) 30 are arranged in a hierarchical manner between the frames 20, and the cooled water supply end 31 and discharge end 32 of all of these exchange coils 30 are common. The main part of the heat exchanger assembly A is configured such that the heat exchanger assembly A is removably mounted on the vertical headers 33 and 34 of the heat exchanger assembly.

In the closed type heat exchanger assembly A of the first invention, each of the heat exchange coils 3o has its straight pipe portion 35 and each joint portion BK of the planar U-shaped curved portion 36 (i.e., folded portion) assembled on the left and right sides. The pair of left and right support side plates or support frames 20Vc are supported in a non-contact manner via a pair of electrically insulating spacers 40. To explain its form in more detail, the spacer 40 is made of a long and narrow member with a cross-section shaped like an opening. The heat exchange coil 30, which is assembled as one set on the inner wall of the support frame 20, has an E-shaped cross section that is elongated in the water direction and is slightly inclined and fixed hierarchically with the cooled liquid supply end 31 side being higher than the discharge end 32. A spacer 40 is inserted into the spacer receiving member 21 from the longitudinal direction of the channel member.
The spacer receiving member 21 is held by holding claws 22 on the outer edge thereof from above and below. In the vertical wall 41 of each spacer 40, small holes 42 corresponding to the diameter of the straight pipe portion 35 of the heat exchange coil 30 are formed at equal intervals in the width direction.
A predetermined number of holes (14 in the embodiment) are formed, and each small hole 4
In the second 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 joint part B of the straight pipe part 35 of the heat exchange coil 30 and the curved part 36
The heat exchange coils 30 are installed at a predetermined rate a (for example, six ) 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 to the inner surface of the support side plate or support frame 20 is connected to the tube end garter 23 provided at the actual location of the channel member 21. When there is no contact with the object, it is supported horizontally.

Note that the shape of the spacer 40 is not limited to the U-shaped elongated member of the embodiment, but may be L-shaped.In short, the spacer 40 is connected to the pair of left and right support side plates or the support frame 2, which supports the heat exchange coil 30 without contact.
The contour shape does not matter as long as the structure can perform the function of supporting zero.

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 300 heat exchange coils is set to be a sufficient number 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 5ff curved pipes having a planar U-shape for connecting these straight pipes 35 are prepared for each 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 mouth-shaped cross section. A pair of left and right common spacers 4 are inserted inwardly from both ends of each straight pipe 35 through small holes 42 drilled at equal intervals in the length direction.
0, and these spacers 40 hold a predetermined number of straight pipes 35 at equal intervals.

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

Among the plurality of straight pipes 35 held in this way, the ends of the adjacent straight pipes 35 are shifted one by one on the left and right, and are connected to each other by the curved pipe 36, for example, by machining. The heat exchange coil 30 is formed with a watertight joint portion B and has a cooled liquid passage that meanders in a zigzag manner.

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 C-shaped cross section and forming shelf-like spacer receiving members are provided on the inner surface at hierarchical intervals with openings 24 facing inward. Separate 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 4o are moved in the longitudinal direction to the positions of the joint portions B at each end of the straight pipe.

A predetermined number of heat exchange coils 30 with spacers 40 arranged in this manner are sequentially assembled to the support side plate or support frame 20 in a non-contact manner hierarchically at intervals through the spacers 40.

That is, the spacer 40 is attached to the corresponding support side plate or support frame 2.
The spacer receiving member 21 K, which is made of a channel member that forms part of the
The heat exchange coils 30 are stacked and supported between the left and right pair of support side plates or the support frame 20 at fixed heights of the spacer receiving members 21 at regular intervals from bottom to top.
The left and right pair of spacers 40 are held by the holding claws 22 on the outer edge of the spacer receiving member 21 (see Figure 5), and the straight pipe 35 of the heat exchange coil 30 is prevented from moving in the axial direction. A predetermined number of heat exchange coils 30 are fixed and held hierarchically between a pair of left and right support side plates or support frames 20.

The separated straight pipes 35 are held by the holding claws 22 of the channel member 21.
The heat exchange coils 30 are placed between the left and right support plates or support frames 20 in a non-contact manner via the spacer 40, and are located at the upper and lower intermediate positions of the opening 24 formed by the upper and lower holding claws 22. will be supported horizontally.

The cooled liquid supply ends 31 of these heat exchange coils 30 are set in the same position and in the same direction, and are formed to be detachable from a common vertical supply header 33, and the cooled liquid discharge ends 32 are set in the same position and in the same direction. Set in the same position and in the same direction on the side opposite the end 31, also a common vertical discharge header 3
The closed type heat exchanger assembly is formed to be detachably attached to 4 ICs, and is provided with a desired number of heat exchange coils 30 horizontally in a state where the discharge end 32 side is lower than the supply end 34. 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 of the present invention constructed as described above will be described below along with the method of use.

a) When the heat exchanger assembly A is used in a cross-flow closed type cooling tower. (See Figure 6) Cross-flow type closed cooling tower CtC Depending on the required cooling capacity,
One or more heat exchanger assemblies A of the present invention are installed, and the cooled liquid discharge end 32 is located on the outside air intake side of the cooling tower main body 50, and the heat exchange coil 30 is arranged horizontally at 5 across the air passage. As shown in FIG. The liquid to be cooled is connected to the 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 and hierarchically, circulated in a zigzag pattern, and then sent to the refrigerator etc. from the common discharge header 34. do.

During this period of 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 fed into the heat exchange coils 30. At this time, each heat exchange coil 30 is Since it is supported by the pair of support side plates or the support frame 20 via the spacer 40, even if the heat exchange coil 30 and the support side plate or support frame 20 are temporarily disposed of dissimilar metals, the Km current will not flow between them, and the At times, corrosion due to galvanic phenomenon does not occur in the heat exchange coil 30 and the support side plates or the support frame 20.

b) When using a counter-current closed type cooling tower DK.

<See Figure 7> The straight pipe portion 35 of the heat exchange coil 30 is vertical or horizontal, and a predetermined number of heat exchanger assemblies are installed in the cooling tower main body 62 between the water sprinkler 60 and the water tank 61. A is incorporated and interconnected, and the liquid to be cooled circulates in each heat exchange coil 30, the sprayed water from the water sprinkler 60, and the heat exchange coil 30.
The liquid to be cooled is cooled by heat exchange between the outside air blowing upward through the cooling tower, similar to that of a conventional countercurrent closed cooling tower.

In this case, the spacer 4
0, a predetermined number of heat exchange coils 30 are supported at vertical intervals between the supporting side plates or the support frame 20 located vertically, and the joint portion BK of the heat exchange coil 30 does not corrode.

When such cooling towers C and D are mounted and in use, dirt adheres to the heat exchange coil 30 and between the adjacent heat exchange coils in a bridging manner due to aerobic bacteria contained in the sprayed water. If some of the heat exchange coils 30 are deformed or damaged due to obstructions to the flow of sprayed water or outside air, dust from the outside, or long-term use, the above-mentioned manufacturing and assembly procedure is reversed and the supply connected vertically is removed. The header 33 and the discharge header 34 are removed, the sealed heat exchanger assembly A is pulled out from each spacer receiving member 21, the heat exchange coil 30 and spacer 40 are cleaned, and the heat exchange coil 3 is removed.
If 0 is damaged, cut that part and braze a new pipe, or replace it with an already assembled heat exchange coil with a spacer separated from the new removable connection and reinstall. Slip each spacer receiving member 21&C and connect the supply and discharge headers 33, 34 again to finish 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 eleventh invention are as follows: Replacement coil 30
are arranged in a stratified manner between a pair of left and right support side plates or support frames 20, and the cooled liquid supply end and discharge end of the total heat exchange coil 30 are each removably attached to a common vertical header. Therefore, by appropriately selecting the number of 300 heat exchange coils, it is possible to obtain a modularized closed type heat exchanger assembly A having the basic cooling capacity. By sequentially connecting the heat exchanger assemblies A vertically, horizontally, and horizontally, it is possible to obtain evaporative closed cooling towers with various cooling capacities in both countercurrent and direct current types. It becomes possible to easily perform inventory management, assembly, and repair of the production line of the great vessel assembly.

Straight pipe portion 35 and U-shaped curved portion 36 of the heat exchange coil 30
A common pair of left and right spacers 4
0, a large number of straight pipe parts 35 can be fixedly held in parallel with each other at intervals by the pair of spacers 40, and with a small number of parts, the heat exchange coil 30, and by extension the above-mentioned A heat exchanger assembly A can be constructed.

Next, since each heat exchange coil 30 is supported via an electrically insulating spacer 40 without directly contacting the pair of left and right supporting side plates or the support frame 20, the heat exchange coil 30
0 and the support side plate or the support frame 20 are not connected, and there is no galvanic corrosion phenomenon that occurs at the contact surface between metals with different potentials, and the joint portion BK of the heat exchange coil 30 is prevented.
This eliminates accidents in which pinholes occur and the liquid to be cooled circulating inside the pinhole flows out into the spray water, and heat exchange between the support side plate or the support frame 20 and materials with high thermal conductivity made of dissimilar metals or metals with different potentials is eliminated. The material of the coil 30 can be selected and used regardless of the material of the support side plate or the support frame 20.
The desired heat exchange effect can be obtained.

The effects of the method for manufacturing a heat exchanger assembly A according to the second invention are as follows: In addition to being able to manufacture a 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, and the adjacent straight pipes 35 are placed near the center as described above.
5 are sequentially connected by a curved pipe 36 to form a zigzag meandering cooled liquid passage. At the same time, the relative positions of the straight pipes 35 are regulated by a pair of left and right spacers 40, and the curved pipe 36 and the straight pipe 35 are connected in a state where the straight pipes 35 are supported by the spacers 40 at mutually parallel intervals. During this connection work, the spacer 40 has the effect of a single jig, and the efficiency of the assembly work is improved.

Furthermore, when the connection between the straight pipe 35 and the curved pipe 36 is completed,
Heat exchange coil 3 integrally having a pair of left and right spacers 40
0 can be obtained, and after this connection, the spacer 40 is connected to the straight pipe 3.
5, by simply slidingly 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 attached to the pair of left and right support side plates or It is possible to securely fix and support the support frame 20 in a vertically hierarchical manner substantially 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.

This spacer 40 is a long and thin member having a U-shaped cross section, and a spacer receiving member 21 for receiving this spacer 40 is fixed to the support side plate or the inner wall of the support frame 20. Upper and lower gripping claws on the outer edge of the channel member 21 having the mouth-like cross section are provided. From 22.22Vc,
By housing and holding the spacer 40 in this channel member 21 from above and below, it is possible to prevent the heat exchange coil 30 from moving in the longitudinal direction, that is, in the axial direction of the straight pipe portion 35, and to hold the heat exchange coil 30 in a predetermined position. Can be placed.

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

Furthermore, a spacer 40 is inserted in the width direction of this channel member 210.
Since the spacer 40 is slidable, 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 are also facilitated.

The discharge end 32 side of each heat exchange coil 30 is set at a slightly lower level than the supply end 31 side, and this discharge end 32 is placed on the outside air intake side of the cross-flow cooling tower, and this supply end 36 is placed on the outside air intake side of the cross-flow cooling tower. In the embodiment where the cooling tower is located on the blower side, the water sprayed near the outside air intake is moved inward by the ventilation from the outside air intake, which can eliminate the lack of cooling capacity. The liquid to be cooled circulating inside can be uniformly cooled by applying pressure from the outside air intake side to the blower side.

[Brief explanation of the drawing]

The figures relate to this invention; FIG. 1 is a front view of a typical embodiment of the closed heat exchanger assembly of this invention, FIG. 2 is a plan view of FIG. 1, and FIG. , a partially omitted enlarged front view of the heat exchange coil in the heat exchanger assembly shown in FIG. 4, a cross-sectional view of FIG. 3, FIGS. The figure is a perspective view of a conventional heat exchange coil unit. Explanation of main symbols in the diagram 20...Support side plate or support frame, 30...
・Heat exchange coil, 40... Spacer, A...... Sealed heat exchanger assembly. Patent applicant: Shinsou Sangyo Co., Ltd. Agent: Patent attorney Yamada Kingdom

Claims (1)

[Scope of Claims] 1) A closed heat exchanger assembly for use in an evaporative closed cooling tower that cools the liquid flowing inside the coiled closed heat exchanger assembly while being isolated from the atmosphere, comprising: The heat exchanger assembly includes liquid supply ends and discharge ends of all of the 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. are removably mounted on a common vertical header, and each of the heat exchange coils has its straight pipe section and U
It is characterized in that it is supported in a non-contact manner 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 to each joint part of the curved pipe part. Closed heat exchanger assembly used in evaporative closed cooling towers. 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 square-shaped cross section, and the spacer has a horizontally long square cross-section and is protruded from the inner wall of the support plate or support frame, with its opening facing the support side plate or support frame. The evaporation type according to claim 1 or 2, wherein the heat exchange coil is housed and held in a receiving member and is supported substantially horizontally on a pair of left and right support side plates or a support frame via the spacer. Closed heat exchanger assembly used in closed 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 the support frame. The evaporative closed type cooling 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 heat exchanger assembly used in towers. 5) When manufacturing a closed heat exchanger assembly for use in an evaporative closed cooling tower that cools the liquid flowing inside the coil-shaped closed heat exchanger assembly while keeping it isolated from the atmosphere, a large number of direct A process of preparing a number of U-shaped curved pipes 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 predetermined number of these straight pipes in parallel and a step of fitting a pair of electrically insulating common spacers inwardly from both ends, and bending the ends of the same side of the adjacent straight pipes supported at a predetermined interval by the pair of left and right spacers into the U-shape; A step of manufacturing a plurality of such heat exchange coils, and replacing the spacers located on both sides of each heat exchange coil with a straight pipe section by sequentially connecting them with pipes to form a heat exchange coil having a meandering cooled liquid passage. A shelf-like spacer receiver in which each spacer of each heat exchange coil is protruded inward in a layered manner at intervals on the inside of a vertical support side plate or support frame while being placed near the connection part of the bent pipe section. 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 support side plate or the support frame by slidingly holding one heat exchange coil on each member. 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 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 it so that it can be attached to and detached from a common vertical discharge header; Method of manufacturing a heat exchanger assembly. 6) A closed type heat exchanger assembly for use in an evaporative closed type 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 cooled liquid discharge end. manufacturing method. 7) A method for 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 an elongated material with a cross section of a square shape into a predetermined width dimension, and with the opening of the spacer facing the support side plate or the support frame, it is protruded from the inner wall of the support side plate or the support frame. The spacer is housed and held in a horizontally long cross-sectional channel member provided, and the heat exchange coil is supported substantially 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 5, 6, or 7.