JPH0633963B2 - Cooling tower using synthetic resin heat exchanger for cooling tower and closed heat exchanger composed of this heat exchanger - Google Patents

Description

Detailed Description of the Invention a. Object of the Invention (Industrial field of application) The present invention relates to a heat exchanger for a cooling tower and a cooling tower using a heat exchanger composed of this heat exchanger.

(Prior Art) Conventionally, a gas-liquid non-contact type heat exchanger of this type has been disclosed in Japanese Patent Laid-Open No.
No. 100370, the structure is entirely made of synthetic resin and is formed by a plurality of flat vertical liquid flow passages parallel to each other and between the liquid flow passages. Cooling having a flat airflow passage having a vertical surface, and these two fluid passages being partitioned by a heat exchange partition plate made of a plurality of synthetic resin plates that do not make mutual fluids in contact with each other. A heat exchanger for towers is described in which both walls of each air passage are formed by inverted U-shaped members, and corrugated side walls of adjacent inverted U-shaped members are bonded to each other by protruding rib portions. The liquid flow-down passages are connected to each other at their side edges by connecting panels.

(Problems to be Solved by the Invention) As described above, in the prior art, the liquid passage that is narrow and bent to slow down the flow velocity of the liquid is dusty or microbially contaminated during long-term use. Attached to the
The cross-sectional area of the liquid passage is substantially narrowed, it is not possible to flow down at a predetermined flow rate, water overflows on the supply side of these heat exchangers, not only wetting these surroundings by mischief, but also loss of circulating refrigerant. .

Further, there is a case where desired cooling cannot be performed due to the overflow phenomenon on the supply side, and since the fluid passage is narrow, air that has entered the inside is hard to escape and stays in this passage, which hinders heat exchange.

According to the present invention, in the liquid passage in the main portion for heat exchange of the gas-liquid non-contact type heat exchanger, even if a part of the liquid passage is clogged, the amount of liquid supplied and discharged can be kept constant as a whole of the heat exchanger. A heat exchange element that does not affect the flow rate of the liquid passage, smoothly escapes the invading air, and divides the supplied liquid into two parts for supply and dispersion in the liquid passage. In addition, it is an object of the present invention to provide a cooling tower using such a heat exchange element.

B. Structure of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned objects, the synthetic resin heat exchange element for a cooling tower according to the specific invention is a thin synthetic resin thin hollow body as a whole, and the inside thereof is a liquid flowing down. A cylindrical circulating cooling water supply port that is open to the outside is formed in the center of the upper edge of the hollow body as a passage, and the center of the lower edge of the liquid flow passage that is the lower edge of the hollow body is also outside. A cylindrical circulating water discharge port opened at the same position is provided on the same axis as the supply port, and most of the width of this liquid flow-down passage is a slow-flowing liquid slowing part, and this slow-flowing liquid slowing part is the hollow part. Horizontally long obstruction seal parts, which are made by closely adhering both wall plates of the body to each other, are hierarchically distributed over the entire surface in multiple stages, and these obstruction seal parts are displaced every other position, and between the obstruction seal parts. A meandering channel is formed on the side of the hollow body. A vertical seal portion is formed at a distance from each side edge, and two vertical seal portions extending over the supply port and the discharge port are formed in the center of the hollow body. One side-to-side overflow channel is formed between each of the two vertical seal portions, and one central overflow channel is formed between the two central vertical seal portions. The slow-flowing part is separated into two fluid passages in the central overflow passage, and the upper ends of these vertical seal portions are in the shape of weirs, and the lateral overflow passages and the central overflow passages are passed through the weirs. And the uppermost liquid storage portion of each fluid passage communicate with each other, and at the curved path position of the meandering slow-moving portion, the vertical seal portion is crossed to open in the overflow channel. Air vent holes are formed, and the outer surfaces of both wall plates are
The raised portion is formed as a spacer.

It is desirable that the hollow body is a vacuum or blow molded product.

In the synthetic resin heat exchanger for a cooling tower according to claim 1, both walls of the meandering flow path between the vertically long and horizontally obstructing seal portions which are vertically adjacent to each other are located on the downstream side over the entire surface of both walls. It may be in the shape of a corrugated plate in which upper and lower parallel ridges inclined at about 45 degrees are formed inside and outside.

The cooling tower as a related invention is an industrial process fluid that is heated from a water sprinkler installed in the cooling tower main body and sprays cooling water onto the sealed heat exchanger, and is supplied from the load section into the heat exchanger. Is indirectly cooled, and the cooling water whose temperature has risen is brought into direct contact with the air flow to be cooled by the latent heat of vaporization and supplied to the sprinkler to be circulated for use and the industrial process fluid cooled to a predetermined temperature is supplied to the load section. A cooling tower which is circulated and used, wherein a predetermined number of synthetic resin heat exchangers for cooling towers according to claim 1 are arranged in parallel with each other with a slight gap therebetween by fitting or abutting the raised portions. A narrow airflow passage is formed between the adjacent heat exchange elements, and a recess is formed from the supply port toward the upper end of the central overflow channel. The upper end of the joint pipe consisting of a detachable short pipe in the depression is for industrial use It is communicated with a pipe for supplying a process fluid, and the lower end of this joint pipe is closed, and when inserted into the recess, the lower end is located at the bottom of the recess and slightly separated from the upper end of the central overflow channel. Two industrial process fluid distribution holes, which are paired in the diameter direction, are formed in the peripheral wall of the joint pipe near the lower end thereof, and at the upper end of the joint pipe, a group of radially projecting members is formed. It is preferable that an air-bleeding cap portion that also serves as an umbrella-shaped cooling water intrusion prevention portion is formed from the viewpoint of distributing the circulating cooling water in the cooling tower and from the viewpoint of air bleeding.

An upper end of a discharge pipe is fitted and integrally bonded to a discharge port of the heat exchanger, and a lower end of the discharge pipe has an outside air opening type circulating cooling water installed in a lower water tank for spray water of a cooling tower. It is advantageous to separate the spray water and the circulating cooling water from the spray expansion tank, and the discharge port communicates with the load through the tank.

The cooling tower is of a counter flow type or a cross flow type.

(Operation of the Invention) The operation of the heat exchanger according to the present invention configured as described above will be described together with the operation of the cooling tower.

First, a plurality of heat exchange elements are arranged in parallel using a case or an appropriate support frame, and the raised portions are used as a kind of spacer,
As a result, a horizontal air passage having a narrow width is formed between the adjacent heat exchangers, and a closed heat exchanger having a desired size is assembled.

The heat exchanger thus assembled is arranged in the cooling tower below the sprinkler installed in the cooling tower body. In this state, sprayed water was sprayed from the water sprinkler onto the closed heat exchanger, and the heated circulating cooling water supplied from the load part into the heat exchanger was indirectly cooled to raise its own temperature. The sprayed water is brought into direct contact with the air flow to be cooled by the latent heat of vaporization to be supplied to the water spraying device for circulation, and the circulating cooling water cooled to a predetermined temperature is supplied to the load part for circulation.

At this time, the circulating cooling water circulated by the load part (about 30 to 70 ° C.) is supplied from the supply port into the heat exchange body through the supply header, and preferably the left and right holes formed in the joint pipe. The circulating cooling water is divided into two streams on both sides directly above the central overflow passage through the two circulating cooling water pipes, and is jetted and dispersed and flows into the uppermost liquid reservoir portion in the two fluid passages.

Then, the circulating cooling water supplied into the two fluid passages formed by dividing the slow-moving liquid slowing portion into two gradually flows while meandering in the meandering passage formed between the baffle seal portions, and the heat exchange is performed. Cooling water that comes into contact with both wall plates of the body while being sufficiently agitated, and comes into contact with both wall plates for a much longer time than simply flowing vertically down, and vertically flows through the air flow passages through these wall plates. Is indirectly cooled by. In this way, the circulating cooling water cooled to a predetermined temperature is discharged into the expansion tank through the discharge port, preferably a discharge pipe connected to the discharge port, and then circulated and supplied to the load section. On the other hand, the spray water cooled by contact with air is supplied from the lower water tank to the water spray device by a pump and is reused.

In addition, when both wall plates of the meandering flow path between the obstructing seal parts are formed in a corrugated plate shape in which inside and outside are parallel ridges inclined forward and backward by 45 degrees toward the downstream side over substantially the entire surface of both wall plates. The circulating cooling water circulating in the meandering channel is guided upwards and swells up a little each time it gets over these ridges, and the circulating cooling water is filled or filled up to the upper side of the channel in each horizontal part of the meandering channel. At least the upper portion of the inner wall surface of the horizontal portion is wetted to reach the bending position, and keeps contact with almost the entire surfaces of both wall plates for a long time.

During the operation of this cooling tower, the air remaining in the slow-flowing liquid slowly moves to the upper corner angle of the curved path of the slow-flowing liquid slowly along with the movement of the industrial process fluid that rises slightly upward due to the ridges. I was pushed and tried to stay in this part,
It flows through the air vent holes into the lateral and central overflow channels, rises in these overflow channels, and reaches the supply port. The air collected in the supply port passes through the gap between the upper end of the central overflow bottle and the lower end of the joint pipe, and is discharged to the outside of the heat exchanger through the gap formed between the upper end of the supply port and the lower edge of the cap portion. At the same time, a part of the sprayed water sprayed on the upper surface of the hat portion spreads toward the upper edge of the heat exchange body while avoiding the supply port, and the sprayed water does not enter the heat exchange body from the supply port. .

If the supply amount of circulating cooling water pulsates, or if the supply amount temporarily increases, or microorganisms adhere to the slow flowing liquid slow path, the cross sectional area of the slow flowing liquid narrows. When the flow rate decreases and the water level in the liquid reservoir in the uppermost stage of the liquid passage rises and becomes higher than the weir, a part of the circulating cooling water directly flows down through the lateral or central overflow channel, Do not overflow outside the supply port that is open to the atmosphere of the exchanger.

During the operation of the cooling tower, the supply port of each heat exchanger is open to the outside air, and the circulating cooling water arranged in the cooling tower in a natural flow type meanders in the slow flow-through path. While flowing down. Then, at the same time when the operation of the cooling tower is stopped, it receives atmospheric pressure and is discharged from the discharge port to the outside.

The operation of the cooling tower is the same as that of the cross flow system and the counter system.

(Example) Next, a typical example of this heat exchanger will be described together with a typical example of a counterflow type cooling tower.

In FIG. 1, A is a synthetic resin heat exchanger for a cooling tower,
This heat exchanger A is composed of a thin synthetic resin thin hollow body 10 as a whole, and has a liquid flow-down passage 11 inside and a cylindrical circulating cooling water supply opening to the outside at the center of the upper edge 12 of the hollow body 10. The mouth 13 is formed and this hollow body 1
At the center of the lower edge of the liquid flow-down passage 11, which is the lower edge of 0, a cylindrical circulating cooling water discharge port 15 that opens to the outside is provided on the same axis as the supply port 13.
Most of the width of the falling liquid is the slow flowing liquid slowing part 16, and the slow flowing liquid slowing part 16 has a horizontally long obstruction seal portion 19 in which both wall plates 17 and 18 of the hollow body 10 are in close contact with each other. Are hierarchically distributed in a plurality of stages over the entire surface, and every other one of these baffle seal portions 19 is displaced, and a meandering flow path is formed between the baffle seal portions 19.

The hollow body 10 is a vacuum or blow molded product.

Vertical seal portions 22 and 23 are formed along both side edges 20 and 21 of the hollow body 10 with a space from each side edge 20 and 21, and further, the supply port 13 and the discharge port 1 are provided.
Two vertical seals 24, 25 extending over
Is formed in the center of the hollow body 10, and the side edge 2
0 and 21 are respectively provided between the seal portions 22 and 23 which are perpendicular to each other, and one sideward overflow channel 26 and 27 is formed respectively.
One central overflow 2 between the vertical seals 24 and 25 of the book
8 is formed, the slow-flowing liquid slowing portion 16 is divided into two fluid passages 16a and 16b by the central overflow passage 28, and the upper ends of these vertical seal portions 22, 23, 24 and 25 are weirs 29. Through the weir 29, each lateral overflow channel 26, 27,
The central overflow passage 28 and the liquid storage portion 16c at the uppermost step of each of the fluid passages 16a, 16b are in communication with each other, and the vertical seal portion is provided at the bending passage 16d of the meandering slow-moving portion 16. Air vent hole 3 that crosses 22, 23, 24, 25 and opens into the overflow channels 26, 27, 28
0 is formed, and ridges 31 are formed as spacers on the outer surfaces of the both wall plates 17 and 18.

The obstruction seal portion 19 that is vertically long and is long in the horizontal direction
The both side wall plates 17 and 18 of the meandering flow path between the two side wall plates 1
It may be in the shape of a corrugated plate in which parallel ridges 32 inclined forward and backward by 45 degrees are formed inward and outward over the entire surface of 7 and 18 toward the downstream side.

A predetermined number of the heat exchangers A made of the synthetic resin for the cooling tower are arranged in parallel with each other by fitting or abutting the raised portions 31 with a slight gap therebetween, and a narrow air flow passage is provided between the adjacent heat exchangers A. The formed closed heat exchanger B for the cooling tower is arranged in the counterflow cooling tower C.

A recess 34 is formed from the supply port 13 toward the upper end of the central overflow passage 28, and an upper end of a connecting pipe 35 made of a detachable short pipe is provided in the recess 34 at an upper end of a pipe 36 for supplying an industrial process fluid. The opening 38 is provided to accommodate the tip of the downward nozzle 37 provided in the. The upper end of the joint pipe 35 may be directly connected to the discharge port of the pipe 36 without using the nozzle 37. The lower end of the joint pipe 35 is closed, and when inserted into the recess 34, the lower end is located at the bottom of the recess 34 and slightly separated from the upper end of the central overflow passage 28. In the peripheral wall of the pipe 35, two industrial process fluid distribution holes 39 that are paired in the diametrical direction are formed in the diametrical direction, and the upper side of the joint pipe 35 covers the upper side of the supply port 13. As described above, the air-releasing cap portion 40 that also serves as a umbrella-like protrusion of the cooling water that extends in the radial direction is formed.

Reference numeral 42 denotes a water sprinkling device for sprinkling cooling water on the closed heat exchanger B, which is piped in the cooling tower main body 43 and communicates with the lower water tank D via the pumping pump P.

(Operation of Example) The operation of the cooling tower C and the heat exchanger A of the example configured as described above is as follows.

Cooling water is sprayed from the water spraying device 42 onto the closed heat exchanger B, and the heated industrial process fluid supplied from the load section into the heat exchanger B is indirectly cooled to heat itself. The sprayed water is brought into direct contact with the airflow, cooled by the latent heat of vaporization, pumped up by the pumping pump P to the sprinkler 42, used for circulation, and used again for supplying the industrial process fluid cooled to a predetermined temperature to the load part G. This is also circulated for use.

At this time, the circulating industrial process fluid heated in the load part G (about 30 to 70 ° C.) is supplied from the supply port 13 into the heat exchanger A through the supply header F,
Through the joint pipe 35, the industrial process fluid is split into two streams on both sides just above the central overflow 28.
The two fluid passages 16a and 16b are dispersed and flown into the uppermost liquid reservoir portion 16c.

Next, the industrial process fluid supplied into the two fluid passages 16a and 16b, which are formed by dividing the falling liquid slow-moving portion 16 into two, sequentially meander in the meandering flow passages formed between the baffle seal portions 19, and sequentially. It flows down and comes into contact with both wall plates of the heat exchanger while being sufficiently stirred, and comes into contact with both wall plates for a much longer time than simply flowing vertically, and the air flows through the both wall plates 16 and 17. It is indirectly cooled by spray water flowing vertically through the flow path. The industrial process fluid thus cooled to a predetermined temperature is connected to the discharge port 15 through the discharge pipe 4.
After being discharged into the expansion tank E through 4, it is circulated and supplied to the load part G. On the other hand, the sprayed water cooled by contact with the air is pumped from the lower water tank D by the pumping pump P to the water spraying device 42 and supplied for reuse.

In the case where both walls of the meandering flow path between the baffle seal portions 19 are in the shape of a corrugated plate in which parallel ridges 32 inclined forward and backward by 45 degrees are formed inward and outward over the entire surfaces of the both walls and the entire surface. , The cooling water circulating in the meandering flow path has these ridges 32
Each time it gets over, it rises slightly and rises a little, and the cooling water fills up to the upper part of the flow path of each horizontal part of this meandering flow path or wets at least the upper part of the inner wall surface of the horizontal part and reaches the bending position. , Both wall boards 17, for a long time,
Keep in contact with the entire surface of 18

During the operation of the cooling tower C, the air remaining in the slow-flowing liquid slowing portion 16 is moved slightly upward by the ridges 32 as the cooling water moves upward, and the curved passage 16d of the slow-flowing liquid slowing portion 16 is moved. Although it is pushed to the upper corner and tries to stay in this portion, it flows through the air vent holes 30 into the lateral and central overflow channels 26, 27, 28, and these overflow channels 2
6, 27, 28 are raised to the supply port 13 and the cap portion 4
It passes through the gap with 0 and is exhausted to the outside (in the atmosphere).

Further, the cap portion 40 scatters a part of the cooling water sprinkled from the sprinkler device 42 to the vicinity of the supply port 13 to the outside of the supply port 13, and the cooling water flows from the supply port 13 to the industrial process fluid. Avoid mixing and flowing into the heat exchanger A.

If the industrial process fluid supply rate pulsates or the supply rate temporarily increases, or if microorganisms adhere to the downflowing fluid slow-speed passage 16, the cross-sectional area of the downflowing fluid slow-passage 16 is increased. Becomes smaller, the flow rate decreases, the water level in the liquid reservoir 16c at the uppermost stage of the liquid passage 16 rises, and becomes higher than the weir 29. As a result, a part of the cooling water flows into the lateral or central overflow channel 2
It does not flow out of the supply port 13 which is open to the atmosphere of the heat exchange body through the flow through 6, 27 and 28 directly toward the discharge port 15.

In addition, during the operation of the cooling tower C, the supply port 13 of each heat exchanger A is open to the outside air, and the cooling tower C is naturally flow-down type.
The circulating cooling water therein flows down while meandering in the slow-flowing liquid passage. Then, at the same time when the operation of the cooling tower C is stopped, the cooling tower C receives atmospheric pressure and is discharged from the discharge port 15 to the outside.

(Other Examples) The cooling tower is a cross-flow type cooling tower C _1, and this cooling tower C ₁
The sealed heat exchanger B is arranged so as to face the outside air intake 50 (see FIG. 5).

In this cross flow type cooling tower C ₁ , the closed heat exchanger B is faced to the outside air intake 50 of the cooling tower C _1.
, The airflow taken in from the outside air inlet 50 flows into the airflow passage of the heat exchanger group A from the horizontal direction.

On the other hand, the industrial process fluid meandering down the bent downflow slow-moving portion 16 of the heat exchanger A is indirectly cooled by the sprayed water flowing down the air passage during the flow. It The cooling water whose temperature has risen by such cooling comes into direct contact with the air flow horizontally flowing in this passage and is cooled by the latent heat of vaporization, while the heated air is exhausted from the exhaust port to the outside of the cooling tower C _1. To do.

(Effects of the Invention) In the heat exchange element of this specific invention configured and acting as described above, it is a thin synthetic resin thin hollow body as a whole, and the inside is a liquid flow-down passage and the hollow body is above the hollow body. A cylindrical circulation cooling water supply port that is open to the outside is formed in the center of the rim, and a cylindrical circulation cooling that is also open to the outside is formed in the center of the lower edge of the liquid flow passage that is the lower edge of the hollow body. The water discharge port is provided on the same axis as the supply port, and most of the width of the liquid flow-down passage is a slow-flowing liquid slowing part, and the slow-flowing liquid slowing part connects both wall plates of the hollow body to each other. Horizontally long obstruction seal parts that are in close contact with each other are hierarchically distributed over the entire surface in multiple stages, and these obstruction seal parts are displaced every other position to form a meandering flow path between the obstruction seal parts. The vertical seals along the edges of the hollow body are Two vertical seal portions, which are formed at a distance from each side edge and extend over the supply port and the discharge port, are formed in the central portion of the hollow body. One side-to-side overflow channel is formed between each of the two vertical seal sections, and one central overflow channel is formed between the two vertical seal sections at the center. The velocities are separated into two fluid passages in the central overflow channel, and the upper ends of these vertical seals are in the shape of weirs, through which the lateral overflow channels, the central overflow channel, and the maximum in each of the fluid channels. Since the upper-stage liquid reservoir is in communication with each other, even if the flowing-down liquid slow speed part has a large area,
This is divided into 22 parts on the left and right, and the circulating cooling water can be split into the two fluid passages from the central supply port. Since it can be distributed without overflowing to the outside of the heat exchanging body, the circulating cooling water can be efficiently brought into contact with the air flow over a wide area, and the heat exchanging area of the heat exchanging body can be made large.
The number of heat exchangers packed in the cooling tower can exhibit at least the same heat exchange rate as the conventional one.

In the slow-flowing liquid slow portion, which is the main part of heat exchange, if there is some clogging or flow rate restriction, the flow rate of the circulating cooling water changes temporarily, and the water level in the liquid reservoir rises, Since the circulating cooling water is discharged downward beyond the weir through the overflow channel, there is no risk of limiting the amount of passing water itself.

Further, at the start of the cooling tower operation, the air remaining in the slow-flowing liquid slow portion is urged by the circulating cooling water to the upper part of the curved path of the slow-flowing liquid slowing portion, and passes through the air vent hole to enter the overflow channel. Since the air flows into the spillway and rises in the overflow channel and is discharged to the outside from the supply section, the air hardly remains in the slow-downflowing section, and heat exchange is not hindered. Preferably, the air that has passed through the gap between the lower end of the joint pipe and the upper end of the central overflow channel can be discharged into the atmosphere from the gap between the lower end of the cap portion between the supply port and the joint.

Further, for both walls of the meandering flow path between the baffle seals, a corrugated plate is formed in which inside and outside are parallel ridges inclined forward and backward by 45 degrees toward the downstream side over the entire surface of both side wall plates. In the heat exchanger made of synthetic resin, in addition to the effect of the specific invention, the circulating cooling water circulating in the meandering flow path is guided upward every time it gets over these ridges, and rises slightly.

In this case, even if air remains on the upper side of each horizontal flow path portion, this rising circulating cooling water pushes the air out of the air vent hole, so that the residual air inside the horizontal flow path portion It does not hinder the rise of water level in.

Further, the circulating cooling water rises to the upper side of the flow path of each horizontal part of the meandering flow path and fills each horizontal part or at least the upper part of the inner wall surface of the horizontal part to reach the bending position. Compared to the case without inclined ridges, the circulation cooling water takes a longer time to pass through the meandering flow path, and the surface area of contact between both wall plates and the circulation cooling water becomes wider,
The indirect heat exchange rate between the spray water and the circulating cooling water can be increased.

In the cooling tower, even if a part of the slow-flowing liquid is clogged, the circulating cooling water is discharged from the lower opening through the overflow passage beyond the weir, so that the circulating cooling water is This supply amount does not drastically decrease without overflowing from the supply unit, and the sealed heat exchange amount between the circulating cooling water air and the cooling water in the heat exchanger does not decrease.

If the hollow body is formed into a vacuum or blow-molded product, the heat exchange body can be manufactured easily and at low cost.

A recess is formed from the supply port toward the upper end of the central overflow channel, and the upper end of a connecting pipe made of a detachable short pipe is connected to a circulating cooling water supply pipe in the recess. The lower end of the joint pipe is closed, and when inserted into the recess, the lower end is located at the bottom of the recess and slightly separated from the upper end of the central overflow channel, and the peripheral wall of the joint pipe is close to the lower end of the joint pipe. Two circulating cooling water distribution holes forming a pair in the diametrical direction are bored, and a cap-like cap portion for preventing the intrusion of cooling water in the form of a umbrella extending radially toward the upper end of the joint pipe. In the case of a cooling tower characterized by being formed, by the closed short pipe lower end, it is possible to prevent a large amount of circulating cooling water from directly flowing from the supply port into the central overflow ledge, and Smooth distribution of industrial process fluid to the two fluid passages It can be carried out in the figure. At the same time
The air that has passed through the gap between the upper end of the central overflow channel and the lower end of the connecting pipe can be discharged to the outside from the gap formed between the upper end of the supply port and the lower edge of the cap portion, and the sprayed on the upper surface of the cap portion. A part of the water spreads toward the upper edge of the heat exchange body while avoiding the supply port, and it is possible to prevent the sprayed water from entering the heat exchange body through the supply port.

Next, an upper end of a discharge pipe is fitted and integrally bonded to a discharge port of the heat exchanger, and a lower end of the discharge pipe is an outside air opening type installed in a lower water tank for spray water of a cooling tower. In the case of a cooling tower characterized in that it is connected to an expansion tank for circulating cooling water and this discharge port communicates with the load section through this tank, spray water and circulating cooling water are separated from each other, Can be recycled without mixing.

The effect of each cooling tower can be exerted not only in the counterflow type cooling tower but also in the crossflow type cooling tower.

(Effects of Embodiments) Of course, the embodiments configured and operated as described above exhibit the effects of the above-described inventions, and further, the upper end of the joint pipe 35 is directly connected to the discharge port of the pipe 36 for communication. In this case, piping work for the nozzle 37 can be omitted, and the structure of the cooling tower as a whole can be simplified.

[Brief description of drawings]

FIG. 1 relates to the present invention. FIG. 1 is a front view showing a typical embodiment of this heat exchanger, FIG. 2 is a schematic view of a counterflow type cooling tower of the first embodiment, and FIG. FIG. 4 is an enlarged vertical sectional view of a supply port portion, FIG. 4 is an enlarged vertical sectional view of a discharge port portion thereof, FIG. 5 is a schematic diagram of a cross-flow type cooling tower of another embodiment, and FIG. 6 is 6 of FIG. A cross-sectional view along line -6,
7 and FIG. 7 are transverse sectional views taken along line 7-7 of FIG. Main signs in the figure 26, 27 ... Side overflow channel, 28 ... Central overflow channel.

Claims (8)

[Claims] 1. A thin hollow body made of synthetic resin, which is flat as a whole, has a liquid flow-down passage inside, and a cylindrical circulating cooling water supply port opening to the outside is formed at the center of the upper edge of the hollow body. A cylindrical circulating cooling water discharge port that opens to the outside is also provided in the center of the lower edge of the liquid flow passage that is the lower edge of the hollow body on the same axis as the supply port. Most of the width is a slow-flowing liquid slowing part, and the slow-flowing liquid slowing part is hierarchically spread over a plurality of stages with a horizontally long obstructing seal part formed by closely adhering both wall plates of the hollow body to each other. Distributed along the opposite sides of the hollow body, and each one of these baffle seals is displaced to form a meandering flow path between the baffle seals. It is formed at a distance from the side edge, and further has the supply port and the discharge port. Two vertical seal portions extending over the hollow body are formed in the central portion of the hollow body, and one lateral overflow channel is formed between the side edge and the vertical seal portion. One central overflow channel is formed between the two vertical vertical seal sections, and the spilling liquid slowing section is divided into two fluid channels by the central overflow channel, and the upper ends of these vertical seal sections are separated. Is in the shape of a weir, through which each lateral overflow channel, central overflow channel and the uppermost liquid reservoir of each fluid passage communicate with each other, and the meandering slow-moving portion An air bleeding hole is formed at the bent road position so as to cross the vertical seal portion and open into the overflow channel.
A heat exchanger made of synthetic resin for a cooling tower, characterized in that a raised portion is formed as a spacer. 2. The heat exchange element made of synthetic resin for a cooling tower according to claim 1, wherein the hollow body is a vacuum or blow molded product. 3. The both wall plates of the meandering flow path between the vertically long adjacent horizontal obstruction seal parts in the synthetic resin heat exchange element for a cooling tower according to claim 1, A heat exchanger made of synthetic resin for a cooling tower, characterized in that it has a corrugated plate shape in which parallel ridges inclined 45 degrees forward and backward are formed inward and outward over the entire surface of Noho. 4. The spray water is sprayed from a sprinkler installed in the cooling tower main body onto the closed heat exchanger, and the heated circulating cooling water supplied from the load part into the heat exchanger is indirectly supplied. Cooling, the sprayed water that has risen in temperature is directly contacted with the air flow, cooled by latent heat of vaporization, supplied to the water spraying device and circulated for use, and the circulating cooling water cooled to a predetermined temperature is supplied to the load part for circulation and use In the tower, a predetermined number of synthetic resin heat exchange elements for a cooling tower according to claim 1 are arranged in parallel with a slight gap therebetween by fitting or abutting raised portions with each other, and between adjacent heat exchange elements. A cooling tower, characterized in that a narrow airflow passage is formed in 5. A recess is formed from the supply port toward the upper end of the central overflow channel, and the upper end of a connecting pipe consisting of a detachable short pipe communicates with a pipe for supplying circulating cooling water in the recess. The lower end of this joint pipe is closed, and when it is inserted into the recess, the lower end is located at the bottom of the recess and slightly separated from the upper end of the central overflow channel. Circular cooling water distribution holes forming a pair in the diameter direction are formed in the peripheral wall of the pipe, and the pipe-like cooling water that protrudes in the radial direction is also provided near the upper end of the joint pipe to prevent the entry of cooling water. The cooling tower according to claim 4, wherein an air-releasing cap portion is formed. 6. An upper end of a discharge pipe is fitted and integrally bonded to a discharge port of the heat exchange element, and a lower end of the discharge pipe is an outside air opening installed in a lower water tank for sprayed water of a cooling tower. 5. The cooling tower according to claim 4, wherein the cooling tower is connected to an expansion tank for circulating cooling water of a mold, and the discharge port communicates with the load section through this tank. 7. The cooling tower according to claim 4, 5, or 6, wherein the cooling tower is of a counter flow type. 8. The cooling tower according to claim 4, 5, or 6, wherein the cooling tower is of a cross flow type.