JP6809021B2 - Cooling water circulation system - Google Patents

Description

The present invention relates to a cooling water circulation system, and more particularly to a cooling water circulation system including a cooling tower side circulation path and a chiller machine side circulation path.

As a conventional cooling water circulation system, a cooling tower side circulation path (also referred to as a "primary circulation path") for circulating cooling water between the cooling tower and the chiller machine and cooling water between the chiller machine and the cooling target portion are used. It is generally known that the chiller machine side circulation path (also referred to as “secondary circulation path”) is provided (see, for example, Patent Document 1).

In the conventional cooling water circulation system, the cooling tower side circulation path and the chiller machine side circulation path are independent, and the cooling water circulates separately in each circulation path. And, the administration of preservatives, bactericides, etc. by the contractor is usually performed mainly by managing and maintaining the cooling tower side circulation path, and the temperature controller connected to the tank of the chiller machine, the mold cooling hole, etc. It is rarely done in the cooling system of. As a result, corrosion (rust) of the cooling piping directly connected to the product, hard scale mixed with silica, etc. adhere to the inside of the piping, causing insufficient cooling, resulting in variations in product quality, reduced productivity, increased equipment costs, etc. , Causes various obstacles.

Therefore, for example, as shown in FIG. 8, a cooling water replacement device 100 that replaces the cooling water in the tank 106a of the chiller machine 106 has been proposed. In this cooling water exchange device 100, a drainage tank 104 is installed in the vicinity of the chiller machine 106, and the tank 106a of the chiller machine 106 and the drainage tank 104 are connected by a pipe 105 provided with a drainage valve 105a, and inside the drainage tank 104. Is connected to one end of the drainage pipe 107 provided with the water supply pump 107a. Then, at the timing of draining the cooling water, the drain valve 105a is manually opened to drain the water, and then the drain valve 105a is manually closed.

Japanese Unexamined Patent Publication No. 2005-21979

However, in the conventional cooling water shunting device 100, the cooling water in the tank 106a of the chiller machine 106 is manually drained, so that the draining work is forgotten. In addition, since the timing of draining is long, the quality of the cooling water in the tank of the chiller machine deteriorates, and the inside of the tank becomes rusty mud. Therefore, when draining water, solid rust, scale, etc. adhere to the operating part of the float valve, or it gets caught and causes clogging injury, resulting in malfunction and cooling from inside the tank. There are concerns about problems such as water overflowing. Further, it is necessary to install a drainage facility such as a drainage tank in the vicinity of the chiller machine, resulting in a complicated structure.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a cooling water circulation system having a simple structure capable of easily draining cooling water in a circulation path on the chiller machine side.

In order to solve the above problem, the invention according to claim 1 is a cooling tower side circulation path for circulating cooling water between the cooling tower and the chiller machine, and cooling between the chiller machine and the cooling target portion. A cooling water circulation system including a chiller machine side circulation path for circulating water, wherein the cooling tower side circulation path and the chiller machine side circulation path cool the cooling water circulating in the chiller machine side circulation path. The gist is that they are connected by the first connecting pipe for introduction into the tower side circulation path.
The invention according to claim 2 is the invention according to claim 1, wherein a differential pressure injector arranged in a pipe constituting the cooling tower side circulation path is provided on one end side of the first connecting pipe. The gist is that the differential pressure injector can introduce the cooling water flowing through the first connecting pipe to the cooling water flowing through the pipe at a lower pressure than the cooling water.
The invention according to claim 3 is the invention according to claim 2, wherein the differential pressure injector is connected to one end side of the first connecting pipe, and the axis is in the flow direction of the cooling water in the pipe. The small diameter nozzle arranged along the axis and the axis coincide with the axis of the small diameter nozzle, and the discharge port is located downstream of the discharge port of the small diameter nozzle in the flow direction of the cooling water in the pipe. It is a gist to include a large-diameter nozzle arranged in the above, and an intake that takes in cooling water flowing in the pipe into the large-diameter nozzle and generates a negative pressure in front of the discharge port of the small-diameter nozzle. ..
The invention according to claim 4 is the invention according to claim 3, wherein the large-diameter nozzle is arranged so as to cover the outer peripheral surface of the small-diameter nozzle, and the intake is the said of the large-diameter nozzle. The gist is that it is formed on the portion that covers the outer peripheral surface of the small-diameter nozzle.
The invention according to claim 5 is the invention according to claim 4, wherein a plurality of intake ports are formed along the circumferential direction around the axis of the large-diameter nozzle, and the large-diameter nozzle is formed. The gist is that it is formed in an elliptical shape with a short axis along the circumferential direction around the axis.
The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the feed path of the chiller machine side circulation path is an underwater impurity that removes impurities contained in the circulating cooling water. A separation device is provided, and the underwater impurity separation device is provided with a drain port for draining cooling water together with the separated impurities, and the first connection pipe is circulated between the drain port and the cooling tower side. The gist is that it is connected to the return route of the route.
The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the first connecting pipe has an electric valve that opens and closes the first connecting pipe by controlling the opening and closing of a control unit. The gist is that it is prepared.
The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the first connecting pipe is provided with a washer rubber type constant flow valve. ..
The invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein the cooling tower side circulation path and the chiller machine side circulation path circulate in the cooling tower side circulation path. The gist is that the cooling water is connected by a second connecting pipe for introducing the cooling water into the circulation path on the chiller machine side.
The invention according to claim 10 is the invention according to claim 9, wherein the second connecting pipe connects the feeding path of the cooling tower side circulation path and the tank provided in the chiller machine. Is the gist.
The invention according to claim 11 is the invention according to claim 10, wherein a float valve for opening and closing the second connecting pipe is provided on one end side of the second connecting pipe as the water surface of the tank fluctuates up and down. The gist is that it is provided.

According to the cooling water circulation system of the present invention, the cooling tower side circulation path and the chiller machine side circulation path are connected by a first connecting pipe for introducing the cooling water circulating in the chiller machine side circulation path into the cooling tower side circulation path. Has been done. As a result, the cooling water that circulates in the chiller machine side circulation path via the first connecting pipe is introduced into the cooling tower side circulation path. And, since the administration of preservatives, bactericides, etc. by the contractor is usually performed mainly by managing and maintaining the cooling tower side circulation path, the water quality of the cooling water introduced into the cooling tower side circulation path should be improved. It becomes. Further, it is not necessary to install a drainage facility such as a drainage tank near the chiller machine as in the conventional case, and the structure can be simplified.
Further, a differential pressure injector is provided on one end side of the first connecting pipe, and the differential pressure injector has a lower pressure than the cooling water with respect to the cooling water flowing in the pipe. When the cooling water flowing through the connecting pipe can be introduced, even if the cooling water flowing through the chiller machine side circulation path is lower than the cooling water flowing through the cooling tower side circulation path, the chiller machine side circulation is performed by the differential pressure injector. The cooling water flowing through the path is introduced into the cooling tower side circulation path.
When the differential pressure injector includes a small diameter nozzle, a large diameter nozzle, and an intake port, the cooling water flowing in the pipe is taken into the large diameter nozzle from the inlet to discharge the small diameter nozzle. Negative pressure is generated in front of the outlet. Due to the suction force due to this negative pressure, the cooling water is drawn out from the discharge port of the small diameter nozzle at a flow rate faster than that of the cooling water flowing through the first connecting pipe, and is drawn out from the cooling water taken in from the intake and the discharge port of the small diameter nozzle. The cooling water is combined and injected into the pipe from the discharge port of the large-diameter nozzle. Therefore, the cooling water flowing through the chiller machine side circulation path is introduced into the cooling tower side circulation path by the differential pressure injector having a simple structure.
When the large-diameter nozzle is arranged so as to cover the outer peripheral surface of the small-diameter nozzle and the intake is formed in a portion of the large-diameter nozzle that covers the outer peripheral surface of the small-diameter nozzle. Cooling water is effectively taken into the large-diameter nozzle from the intake port, and a larger negative pressure is generated in front of the discharge port of the small-diameter nozzle. Therefore, the injection force of the differential pressure injector is further increased.
Further, a plurality of the intakes are formed along the circumferential direction around the axis of the large-diameter nozzle, and an elliptical shape having a short axis along the circumferential direction of the axis of the large-diameter nozzle. When formed in, cooling water is more effectively taken into the large diameter nozzle from the intake. Therefore, the injection force of the differential pressure injector is further increased.
Further, an underwater impurity separation device is provided in the feed path of the circulation path on the chiller machine side, a drainage port is provided in the underwater impurity separation device, and the first connection pipe is the drainage port and the said. When connected to the return path of the cooling tower side circulation path, the cooling water is introduced into the return path of the cooling tower side circulation path together with the impurities separated by the underwater impurity separator via the first connecting pipe. ..
Further, when the first connecting pipe is provided with an electric valve that opens and closes the first connecting pipe by controlling the opening and closing of the control unit, the cooling water flowing through the chiller machine side circulation path is provided by the timer function of the control unit or the like. Drainage can be automated.
Further, when the first connecting pipe is provided with a washer rubber type constant flow valve, clogging is prevented even if solid impurities pass through the constant flow valve when the cooling water is drained.
When the cooling tower side circulation path and the chiller machine side circulation path are connected by a second connecting pipe, the cooling water circulating in the cooling tower side circulation path via the second connecting pipe is the chiller machine. Introduced into the lateral circulation pathway. Therefore, the cooling water contaminated in the chiller machine side circulation path and the cooling water whose water quality is improved in the cooling tower side circulation path can be easily replaced. As a result, corrosion (rust) of the cooling pipe directly connected to the product and hard scale mixed with silica are suppressed from adhering to the inside of the pipe, as compared with the case where the cooling water is not replaced. The decrease in efficiency is prevented, leading to stable quality.
When the second connecting pipe connects the feed path of the cooling tower side circulation path and the tank provided in the chiller machine, the cooling tower side circulation path is provided via the second connecting pipe. The circulating cooling water is introduced into the tank of the chiller machine.
Further, when a float valve is provided on one end side of the second connecting pipe, the float valve automatically opens and closes the second connecting pipe as the water surface of the tank fluctuates up and down.

The present invention will be further described in the following detailed description with reference to the plurality of references mentioned with reference to non-limiting examples of typical embodiments according to the invention, but similar reference numerals are in the drawings. Similar parts are shown through several figures.
It is an overall schematic diagram of the cooling water circulation system which concerns on Example. It is an enlarged view of the main part of FIG. It is explanatory drawing for demonstrating the 1st connection pipe which concerns on Example. It is explanatory drawing for demonstrating the differential pressure injector which concerns on Example. It is a vertical sectional view of the said differential pressure injector. It is a side view which made a part of the underwater impurity separation apparatus which concerns on Example a cross section. It is explanatory drawing for demonstrating the cooling water circulation system which concerns on other form. It is explanatory drawing for demonstrating the conventional cooling water shunting apparatus.

The matters shown here are for exemplifying and exemplifying embodiments of the present invention, and are considered to be the most effective and effortless explanations for understanding the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this regard, it is not intended to show structural details of the invention beyond a certain degree necessary for a fundamental understanding of the invention, and some embodiments of the invention are provided by description in conjunction with the drawings. It is intended to clarify to those skilled in the art how it is actually realized.

<Cooling water circulation system>
In the cooling water circulation system according to the present embodiment, the cooling tower side circulation path (2) for circulating cooling water between the cooling tower (5) and the chiller machine (6), the chiller machine (6), and the cooling target portion ( A cooling water circulation system (1) including a chiller machine side circulation path (3) for circulating cooling water between the cooling water and the cooling tower side circulation path (2) and a chiller machine side circulation path (3). Is connected by a first connecting pipe (31) for introducing the cooling water circulating in the chiller machine side circulation path into the cooling tower side circulation path (see, for example, FIGS. 1 and 2).

The amount of cooling water introduced by the first connecting pipe (31), the time of introduction, and the like are not particularly limited. From the viewpoint of not affecting the circulating water temperature set in the chiller machine, the amount of cooling water introduced is 0.1 to 0.1 of the circulating water amount of the cooling water circulating in the chiller machine side circulation path (3). It is preferably 5% (preferably 0.1 to 3%, particularly 0.1 to 2%).

As a cooling water circulation system according to the present embodiment, for example, a differential pressure injection arranged in a pipe (60) constituting a cooling tower side circulation path (2) on one end side of the first connection pipe (31). A vessel (36) is provided, and the differential pressure injector can introduce cooling water flowing through the first connecting pipe (31) at a lower pressure than the cooling water to the cooling water flowing in the pipe (60). (For example, see FIG. 4 and the like). In this case, for example, the differential pressure injector (36) can introduce the cooling water flowing through the first connecting pipe (31) to the cooling water flowing in the pipe (60) at a flow rate smaller than that of the cooling water. Can be.

In the case of the above-described embodiment, for example, the differential pressure injector (36) is connected to one end side of the first connecting pipe (31) and its axis is along the flow direction of the cooling water in the pipe (60). The axis of the small diameter nozzle (52) to be arranged coincides with the axis of the small diameter nozzle, and the discharge port is located downstream of the discharge port of the small diameter nozzle in the flow direction of the cooling water in the pipe (60). Large-diameter nozzle (53) arranged in the (54) and can be provided (see, for example, FIGS. 4 and 5).

In the case of the above-described embodiment, for example, the large-diameter nozzle (53) is arranged so as to cover the outer peripheral surface of the small-diameter nozzle (52), and the intake (54) is the outer peripheral surface of the small-diameter nozzle of the large-diameter nozzle. It can be formed in a portion covering the (see, for example, FIGS. 4 and 5). Further, for example, a plurality of the intakes (54) are formed along the circumferential direction around the axis of the large-diameter nozzle (53), and along the circumferential direction around the axis of the large-diameter nozzle. It can be formed in an elliptical shape with a short axis.

As the cooling water circulation system according to the present embodiment, for example, in the feed path (3a) of the chiller machine side circulation path (3), an underwater impurity separation device (17) for removing impurities contained in the circulating cooling water is provided. The underwater impurity separator (17) is provided with a drain port (17a) for draining cooling water together with the separated impurities, and the first connection pipe (31) is provided with a drain port (17a). And the return path (2b) of the cooling tower side circulation path (2) can be connected (see, for example, FIG. 2).

As the cooling water circulation system according to the present embodiment, for example, the first connecting pipe (31) is provided with an electric valve (33) that opens and closes the first connecting pipe by controlling the opening and closing of the control unit (32). The form (see, for example, FIG. 3 and the like) can be mentioned. Further, for example, the first connecting pipe (31) may be provided with a washer rubber type constant flow valve (34) (see, for example, FIG. 3).

As the cooling water circulation system according to the present embodiment, for example, the cooling tower side circulation path (2) and the chiller machine side circulation path (3) are chiller machine side circulation paths for cooling water circulating in the cooling tower side circulation path. (For example, see FIG. 2 and the like), which is connected by a second connecting pipe (38) for introduction into the system.

In the case of the above-described embodiment, for example, the second connecting pipe (38) connects the feeding path (2a) of the cooling tower side circulation path (2) and the tank (6a) provided in the chiller machine (6). (See, for example, FIG. 2 etc.). In this case, for example, a float valve (39) that opens and closes the second connecting pipe as the water surface of the tank (6a) fluctuates up and down is provided on one end side of the second connecting pipe (38). it can.

The reference numerals in parentheses of each configuration described in the above-described embodiment indicate the correspondence with the specific configurations described in the examples described later.

Hereinafter, the present invention will be specifically described with reference to the drawings.

(1) Configuration of Cooling Water Circulation System As shown in FIG. 1, the cooling water circulation system 1 according to the present embodiment has a cooling tower side circulation path 2 (““ Cooling tower side circulation path 2 ”” for circulating cooling water between the cooling tower 5 and the chiller machine 6. It is also referred to as a "primary circulation path") and a chiller machine side circulation path 3 (also referred to as a "secondary circulation path") for circulating cooling water between the chiller machine 6 and the cooling target portion 7. .. Examples of the cooling target portion 7 include an injection molding device, a press working device, a welding device, a heating device, a trim device, and the like.

The cooling tower 5 includes a sprinkler tank 5a that collects and sprinkles cooling water that has risen in temperature sent from the chiller machine 6, a filler 5b that cools the cooling water sprinkled from the sprinkler tank 5a with air, and an intake port for outside air. It is provided with a blower 5c that is taken in from the inside and passed through the inside of the filler 5b, and a water tank 5d that stores the cooling water that has been cooled by the filler 5b and has fallen. In the water tank 5d, a straight pipe 41B made of porous ceramics constituting a microbubble generator 40B for generating microbubbles in the cooling water in the water tank 5d, and a precipitate such as slime settled at the bottom of the water tank 5d are placed. An injector 9 for removing is provided. Further, a multifunction net 10 is stretched so as to cover the intake port of the cooling tower 5 and the sprinkler tank 5a. The multifunctional net 10 prevents the generation of algae, slime, Legionella and the like in the cooling tower 5, and improves the cooling efficiency.

The chiller machine 6 includes a tank 6a for storing cooling water whose temperature has risen sent from the cooling target unit 7, and a heat exchanger 6b for cooling the cooling water in the tank 6a. Inside the tank 6a, a straight pipe 41C made of porous ceramics constituting the microbubble generator 40C for generating microbubbles in the cooling water in the tank 6a is provided.

The cooling tower side circulation path 2 has a feed path 2a whose one end is connected to the water tank 5d of the cooling tower 5 and whose other end is connected to the heat exchanger 6b of the chiller machine 6, and one end is the heat exchanger of the chiller machine 6. It is provided with a return path 2b which is connected to 6b and whose other end is connected to the sprinkler tank 5a of the cooling tower 5. The feed path 2a is provided with a pressure feed pump 12 that pumps the cooling water in the water tank 5d of the cooling tower 5 toward the heat exchanger 6b of the chiller machine 6. Further, the other end side of the introduction pipe 13 whose one end side is connected to the injector 9 is connected to the upstream side of the pressure feed pump 12 of the feed path 2a. The introduction pipe 13 is provided with a pressure feed pump 14 that pumps the cooling water in the water tank 5d of the cooling tower 5 toward the injector 9. Then, the cooling water pumped by the pressure pump 14 is injected from the injector 9, so that the sediment that settles at the bottom of the water tank 5d is removed.

In the introduction pipe 13, a basket filter 16 containing a water treatment agent made of an inorganic substance or the like, an underwater impurity separation device 17 for removing impurities contained in the cooling water, and a tourmaline treatment by bringing the cooling water into contact with the tourmaline granules. A tourmaline treatment device 18 for water is provided. A drain pipe 21 opened and closed by the on-off valve 22 is connected to the drain port 17a of the underwater impurity separating device 17. The on-off valve 22 is controlled to open and close by the control unit 24 according to a value detected from the sensor 23 that detects the electric conductivity of the cooling water. Then, when the drain pipe 21 is opened, the cooling water is drained together with the impurities from the drain port 17a of the underwater impurity separating device 17. Further, the introduction pipe 13 is provided with a bypass path 25, and the bypass path 25 is provided with a magnetic water treatment device 19 that magnetically treats the cooling water.

In this embodiment, the underwater impurity separating device 17 provided in the introduction pipe 13 has been illustrated, but the present invention is not limited to this, and for example, as shown by a virtual line in FIG. 1, the introduction pipe 13 is replaced or added. Therefore, the underwater impurity separating device 17 provided in the return path 2b (or the feed path 2a) of the cooling tower circulation path 2 may be used. Further, in this embodiment, the tourmaline processing device 18 provided in the introduction pipe 13 has been illustrated, but the present invention is not limited to this, and for example, as shown by a virtual line in FIG. 1, in place of or in addition to the introduction pipe 13. , The tourmaline processing device 18 provided in the feed path 2a (or return path 2b) of the cooling tower side circulation path 2 may be used. Further, the tourmaline processing device 18 provided in the return path 3b (or the feed path 3a) described later in the chiller machine side circulation path 3 may be used.

The chiller machine side circulation path 3 has a feed path 3a having one end connected to the tank 6a of the chiller machine 6 and the other end connected to the cooling target portion 7, and one end side connected to the cooling target portion 7 and the other end side. It includes a return path 3b connected to the tank 6a of the chiller machine 6. The feed path 3a is provided with a pressure feed pump 26 that pumps the cooling water in the tank 6a of the chiller machine 6 toward the cooling target portion 7. A bypass path 27 is provided on the downstream side of the pump 26 of the feed path 3a. The bypass path 27 is provided with an underwater impurity separating device 17 that removes impurities contained in the cooling water, and a microbubble generator 40A that generates microbubbles in the cooling water. The micro-bubble generator 40A includes a straight tube 41A made of porous ceramics and an accommodating body 53 accommodating tourmaline granules. Therefore, in addition to the function of generating microbubbles in the cooling water, the microbubble generator 40A also has a function of bringing the cooling water into contact with the tourmaline granules to make tourmaline treated water.

As shown in FIG. 6, the underwater impurity separating device 17 includes a housing 70 having an inflow port 70a and an outflow port 70b. In the housing 70, a baffle plate 71 is provided so as to vertically partition the internal space into the upper filtration chamber S1 and the lower sedimentation chamber S2. A plurality of filter media 72 are housed in the upper filtration chamber S1. Further, a drain port 17a connected to the lower sedimentation chamber S2 is provided at the bottom of the housing 70.

As shown in FIG. 2, the cooling tower side circulation path 2 and the chiller machine side circulation path 3 are first connected to introduce the cooling water circulating in the chiller machine side circulation path 3 into the cooling tower side circulation path 2. It is connected by a pipe 31. The first connection pipe 31 connects the drain port 17a of the underwater impurity separation device 17 and the return path 2b of the cooling tower side circulation path 2.

The first connecting pipe 31 is provided with an electric valve 33 that opens and closes the first connecting pipe 31 by controlling the opening and closing of the control unit 32. The control unit 32 has a timer function, which allows the drainage time zone and the replacement drainage amount to be arbitrarily set according to the water quality state of the cooling water, the temperature setting state, and the like. Further, the first connecting pipe 31 is provided with a washer rubber type constant flow valve 34. Further, as shown in FIG. 3, the first connecting pipe 31 includes a ball valve 43, a PVC Y-shaped strainer 44, a filter 45, a sight glass 46, a tube fitting 47, a transparent Teflon (registered trademark) tube 48, and a check valve 49. , And a ball valve 50 is provided.

The ball valve 43 has a diameter of 25 A because the amount of water intake can be secured by increasing the size of the water intake side. Further, the PVC Y-shaped strainer 44 is provided for preventing equipment damage when a solid substance enters, and is made of a transparent material so that a clogging state can be visually confirmed. Further, as the filter 45, the mesh 40 as a normal product is likely to cause clogging, so 20 mesh that does not affect the drainage equipment is adopted. Further, since the electric valve 33 is a diaphragm type and has troubles such as biting, a ball valve type is adopted. Further, in the sight glass 46, it is easy to visually check the transparent glass and the water turbine to see if the water is drained, and it is easy to check the flow rate. Further, the washer-type constant flow valve 34 is less likely to be clogged, assuming that solid impurities have entered. Further, the tube fitting 47 is adopted in order to improve maintainability. In addition, the transparent Teflon (registered trademark) tube 48 is resistant to hot water, and can visually confirm the weather resistance and the state of water pollution. Further, since the check valve 49 causes a backflow action while the device is stopped, a lift type having high backflow prevention accuracy is adopted. Further, the ball valve 50 adopts a size of 15A because the smaller the drainage diameter, the smoother the drainage.

As shown in FIG. 4, one end side of the first connecting pipe 31 is arranged in a pipe 60 (for example, inner diameter; 70.3 mm, vertical cross-sectional area; 3879.5 mm2) constituting the cooling tower side circulation path 2. A differential pressure injector 36 is provided. The differential pressure injector 36 is capable of introducing the cooling water flowing through the first connecting pipe 31 to the cooling water flowing through the pipe 60 at a lower pressure and a smaller flow rate than the cooling water.

The differential pressure injector 36 has a small-diameter nozzle 52 that is connected to one end side of the first connecting pipe 31 and whose axis is arranged along the flow direction of the cooling water in the pipe 60, and a small-diameter nozzle 52 whose axis is the small-diameter nozzle 52. The large-diameter nozzle 54, which is arranged so as to coincide with the axis of the nozzle and the discharge port 53a is located downstream of the discharge port 52a of the small-diameter nozzle 52 in the flow direction of the cooling water in the pipe 60, and the inside of the pipe 60. It is provided with an intake port 54 that takes in the flowing cooling water into the large-diameter nozzle 53 and generates a negative pressure in front of the discharge port 52a of the small-diameter nozzle 52 (see FIG. 5). In this small diameter nozzle 52, the nozzle hole is reduced in diameter toward the discharge port 52a (for example, inner diameter; 5 mm). Further, in the large-diameter nozzle 53, the nozzle hole has an enlarged diameter toward the discharge port 53a. Further, the opening area of the discharge port 53a of the large-diameter nozzle 53 is larger than the opening area of the discharge port 52a of the small-diameter nozzle 52.

The large-diameter nozzle 53 is arranged so as to cover the outer peripheral surface of the small-diameter nozzle 52. Further, the intake port 54 is formed at a portion of the large-diameter nozzle 53 that covers the outer peripheral surface of the small-diameter nozzle 52 (specifically, a rear end portion of the large-diameter nozzle 53 that is axially opposite to the discharge port 53a). .. Further, a plurality (for example, 6) intake ports 54 are formed along the circumferential direction around the axis of the large diameter nozzle 53. Further, each intake port 54 is formed in an elliptical shape (for example, an elliptical area; 75.39 mm2) having a short axis along the circumferential direction around the axis of the large diameter nozzle 53.

As shown in FIG. 2, the cooling tower side circulation path 2 and the chiller machine side circulation path 3 are connected to a second connection for introducing the cooling water circulating in the cooling tower side circulation path 2 into the chiller machine side circulation path 3. It is connected by a tube 38. The second connecting pipe 38 connects the feeding path 2a of the cooling tower side circulation path 2 and the tank 6a of the chiller machine 6. Further, on one end side of the second connecting pipe 38, a float valve 39 that opens and closes the second connecting pipe as the water surface of the tank 6a fluctuates up and down is provided.

(2) Operation of the cooling water circulation system Next, the operation of the cooling water circulation system 1 having the above configuration will be described. As shown in FIG. 1, the cooling water circulating in the cooling tower side circulation path 2 flows through the introduction pipe 13, the basket filter 16, the underwater impurity separation device 17, the tourmaline treatment device 18, and the magnetic water treatment device 19. The water quality is improved by the action of, and when stored in the water tank 5d of the cooling tower 5, the water quality is improved by the action of the micro bubble generator 40B, and the cooling water is excellent in rust prevention and scale prevention and has a cleaning function. It is said that. On the other hand, the cooling water circulating in the circulation path 3 on the chiller machine side is improved in water quality by the action of the underwater impurity separator 17 and the microbubble generator 40A with a tourmaline treatment function, and is stored in the tank 6a of the chiller machine 6. At that time, the water quality is improved by the action of the micro bubble generator 40C, and the cooling water is excellent in rust prevention and scale prevention and has a cleaning function.

Then, the cooling water with improved water quality circulates in each of the circulation paths 2 and 3, and the scale adheres / accumulates in the mold cooling hole, the cooling pipe, the heat exchanger, etc. due to the deterioration of the water quality of the cooling water. Channel blockage / corrosion / rust / water leakage / slime / algae generation are suppressed. As a result, the quality of molded products is stabilized (the mold can be maintained at a constant temperature; silver defects are unlikely to occur due to insufficient cooling), power saving, and energy saving (improvement of the heat exchange rate of the heat exchanger greatly increases power consumption). Reduction of CO2 emissions by power saving and water saving; Reduction of high pressure abnormality troubles of heat exchangers), Significant reduction of equipment management costs (Reduction of electricity charges for equipment; Reduction of chemical cleaning costs; Reduction of cleaning maintenance costs) Various merits such as can be obtained.

Further, in the cooling water circulation system 1, when the electric valve 33 is opened by the timer function of the control unit 32, the cooling water is discharged together with the impurities from the drain port 17a of the underwater impurity separation device 17 via the first connecting pipe 31. It is introduced into the return path 2b of the side circulation path 2. At this time, the differential pressure injector 36 is more than the cooling water for the cooling water (for example, water pressure: 0.4 MPa, flow rate: 120 L / min) flowing in the pipe 60 constituting the cooling tower side circulation path 2. Cooling water (for example, water pressure: 0.3 MPa, flow rate: 1.8 L / min) flowing through the first connecting pipe 31 at a low pressure and a small flow rate is introduced. On the other hand, when the float valve 39 is operated as the water surface of the tank 6a of the chiller machine 6 descends, the cooling water flowing through the feed path 2a of the cooling tower side circulation path 2 via the second connecting pipe 38 enters the tank 6a. be introduced. That is, the cooling water contaminated in the chiller machine side circulation path 3 and the cooling water whose water quality is improved in the cooling tower side circulation path 2 are replaced.

The amount of drainage discharged from the underwater impurity separator 17 is within 2% of the amount of circulating water on the chiller machine side from the constant flow valve 34 so as not to interfere with the cooling efficiency of the chiller machine 6 in the chiller machine side circulation path 3. It is preferably introduced into the return path 2b of the cooling tower side circulation path 2 through the check valve 49. However, since the amount of circulating water in the heat exchanger 6b differs depending on the use of the chiller machine 6, it is necessary to convert the drainage flow rate according to the specifications and select the constant flow valve 34.

Here, the operation of the differential pressure injector 36 will be described. As shown in FIG. 4, in the first connecting pipe 31, the drainage of 1.8 L / min of water controlled by the constant flow valve 34 has a flow rate of 1.8 L / min of water in the tube 56 (inner diameter; 5 mm). It is accelerated to 2.5 m / sec and maintains a flow rate of 2.5 m / sec with a water volume of 1.8 L / min in the small diameter nozzle 52. On the other hand, a part (water amount; 10 L / min) of the total amount of 120 L / min of cooling water flowing in the pipe 60 is taken into the large diameter nozzle 53 from the intake port 54, so that the discharge port 52a of the small diameter nozzle 52 Negative pressure is generated forward. Due to this negative pressure suction force (suction force 5 times that when there is no intake 54), the drainage flowing in the small diameter nozzle 52 maintains a flow velocity of 2.5 m / sec while maintaining a water volume of 1.8 L / min. It is pulled out from the discharge port 52a. The drainage of 1.8 L / min of water drawn out merges with the cooling water of 10 L / min of water taken in from the intake 54, and the total amount becomes 11.8 L / min, and the flow velocity is 2.5 m in the large diameter nozzle 53. It is accelerated to / sec and discharged (injected) into the pipe 60 from the discharge port 53a of the large-diameter nozzle 53. The total amount of 11.8 L / min of cooling water discharged from the large-diameter nozzle 53a into the pipe 60 merges with the 110 L / min of water flowing outside the differential pressure injector 36, and the total amount of cooling water is 121.8 L / min. The flow velocity is 0.522 m / sec and the water is sent to the upper sprinkler tank 5a of the cooling tower 5 (see FIG. 1).

(3) Effect of Example According to the cooling water circulation system 1 of this embodiment, the cooling tower side circulation path 2 and the chiller machine side circulation path 3 circulate the cooling water circulating in the chiller machine side circulation path 3 on the cooling tower side. It is connected by a first connecting pipe 31 for introduction into the route 2. As a result, the cooling water that circulates in the chiller machine side circulation path 3 via the first connecting pipe 31 is introduced into the cooling tower side circulation path 2. In the administration of preservatives, bactericides, etc. by a trader, the cooling tower side circulation path 2 is usually mainly managed and maintained, so that the cooling water introduced into the cooling tower side circulation path 2 is improved in water quality. The Rukoto. Further, it is not necessary to install a drainage facility such as a drainage tank in the vicinity of the chiller machine 6 as in the conventional case, and the structure can be simplified.

Further, in the present embodiment, a differential pressure injector 36 is provided on one end side of the first connecting pipe 31, and the differential pressure injector 36 with respect to the cooling water flowing in the pipe 60. It is possible to introduce cooling water flowing through the first connecting pipe 31 at a lower pressure than that. As a result, even if the cooling water flowing through the chiller machine side circulation path 3 has a lower pressure than the cooling water flowing through the cooling tower side circulation path 2, the differential pressure injector 36 cools the cooling water flowing through the chiller machine side circulation path 3. It is introduced into the tower side circulation path 2.

Further, in this embodiment, the differential pressure injector 36 includes a small diameter nozzle 52, a large diameter nozzle 53, and an intake port 54. As a result, by taking in the cooling water flowing in the pipe 60 from the inlet 54 into the large-diameter nozzle 53, a negative pressure is generated in front of the discharge port 52a of the small-diameter nozzle 52. Due to the suction force due to this negative pressure, the discharge port 52a of the small-diameter nozzle 52 has a flow rate faster than that of the cooling water flowing through the first connecting pipe 31 (for example, about four times the flow rate of the cooling water flowing through the first connecting pipe 31). The cooling water is drawn out from the inlet 54, and the cooling water taken in from the intake port 54 and the cooling water drawn out from the discharge port 52a of the small diameter nozzle 52 are combined and injected into the pipe 60 from the discharge port 53a of the large diameter nozzle 63. To. Therefore, the cooling water flowing through the chiller machine side circulation path 3 is introduced into the cooling tower side circulation path 2 by the differential pressure injector 36 having a simple structure.

Further, in the present embodiment, the large-diameter nozzle 53 is arranged so as to cover the outer peripheral surface of the small-diameter nozzle 52, and the intake 54 is formed in a portion of the large-diameter nozzle 53 that covers the outer peripheral surface of the small-diameter nozzle 52. ing. As a result, the cooling water is effectively taken into the large-diameter nozzle 53 from the intake port 54, and a larger negative pressure is generated in front of the discharge port of the small-diameter nozzle 52. Therefore, the injection force of the differential pressure injector 36 is further increased.

Further, in the present embodiment, a plurality of intake ports 54 are formed along the circumferential direction of the large-diameter nozzle 53 around the axis, and are short along the circumferential direction of the large-diameter nozzle 53. It is formed in an elliptical shape as an axis. As a result, the cooling water is more effectively taken into the large-diameter nozzle 53 from the intake port 54. Therefore, the injection force of the differential pressure injector 36 is further increased.

Further, in this embodiment, the feed path 3a of the chiller machine side circulation path 3 is provided with the underwater impurity separating device 17, and the underwater impurity separating device 17 is provided with the drain port 17a. The connection pipe 31 connects the drain port 17a and the return path 2b of the cooling tower side circulation path 2. As a result, the cooling water is introduced into the return path 2b of the cooling tower side circulation path 2 together with the impurities separated by the underwater impurity separating device 17 via the first connecting pipe 31.

Further, in the present embodiment, the first connecting pipe 31 is provided with an electric valve 33 that opens and closes the first connecting pipe 31 by controlling the opening and closing of the control unit 32. As a result, the drainage of the cooling water flowing through the chiller machine side circulation path 3 can be automated by the timer function of the control unit 32 or the like.

Further, in the present embodiment, the first connecting pipe 31 is provided with a washer rubber type constant flow valve 34. As a result, clogging is prevented even if solid impurities pass through the constant flow valve 34 when the cooling water is drained.

Further, in this embodiment, the cooling tower side circulation path 2 and the chiller machine side circulation path 3 are connected by a second connecting pipe 38. As a result, the cooling water that circulates in the cooling tower side circulation path 2 via the second connecting pipe 38 is introduced into the chiller machine side circulation path 3. Therefore, the cooling water contaminated in the chiller machine side circulation path 3 and the cooling water whose water quality is improved in the cooling tower side circulation path 2 can be easily replaced. As a result, corrosion (rust) of the cooling pipe directly connected to the product and hard scale mixed with silica are suppressed from adhering to the inside of the pipe, as compared with the case where the cooling water is not replaced. The decrease in efficiency is prevented, leading to stable quality.

Further, in this embodiment, the second connecting pipe 38 connects the feeding path 2a of the cooling tower side circulation path 2 and the tank 6a provided in the chiller machine 6. As a result, the cooling water circulating in the cooling tower side circulation path 2 is introduced into the tank 6a of the chiller machine 6 via the second connecting pipe 38.

Further, in this embodiment, a float valve 39 is provided on one end side of the second connecting pipe 38. As a result, the float valve 39 automatically opens and closes the second connecting pipe 38 as the water surface of the tank 6a fluctuates up and down.

It should be noted that the present invention is not limited to the above-mentioned examples, and various modifications can be made within the scope of the present invention according to the purpose and application. That is, in the above embodiment, the embodiment in which the differential pressure injector 36 arranged in the pipe 60 is provided on one end side of the first connecting pipe 31 is illustrated, but the present invention is not limited to this, and the cooling tower side circulation path 2 When the circulation pressure of the chiller machine side circulation path 3 is higher or equivalent to the circulation pressure, for example, as shown in FIG. 7, a differential pressure injector 36 is provided on one end side of the first connecting pipe 31. Instead, one end side of the first connecting pipe 36 may be directly connected to the outer peripheral side of the pipe 60.

Further, in the above embodiment, the cooling water circulation system 1 in which the cooling water contaminated in the chiller machine side circulation path 3 and the cooling water whose water quality is improved in the cooling tower side circulation path 2 is replaced is illustrated, but the present invention is not limited thereto. For example, the cooling water contaminated in the chiller machine side circulation path 3 is introduced into the cooling tower side circulation path 2, while the chiller machine side circulation path 3 is prepared separately from the cooling water in the cooling tower side circulation path 2. It may be a cooling water circulation system that introduces cooling water.

Further, in the above embodiment, the first connection pipe 31 that connects the drain port 17a of the underwater impurity separation device 17 and the cooling tower side circulation path 2 is illustrated, but the present invention is not limited to this, and for example, the chiller machine side circulation path. It may be a first connecting pipe which directly connects 3 (feed path 3a or return path 3b) and cooling tower side circulation path 2 (feed path 2a or return path 2b).

Further, in the above embodiment, the second connection pipe 38 connecting the cooling tower side circulation path 2 and the tank 6a of the chiller machine 6 is illustrated, but the present invention is not limited to this, and for example, the cooling tower side circulation path 2 (feed). It may be a second connecting pipe that directly connects the path 2a or the return path 2b) and the chiller machine side circulation path 3 (feed path 3a or return path 3b).

The above examples are for illustration purposes only and are not to be construed as limiting the invention. Although the present invention has been described with reference to typical embodiments, the wording used in the description and illustration of the present invention is understood to be descriptive and exemplary rather than limiting wording. As detailed herein, modifications can be made within the scope of the appended claims without departing from the scope or spirit of the invention in that form. Although specific structures, materials and examples have been referred to herein in detail of the invention, it is not intended to limit the invention to the disclosures herein, but rather the invention is claimed in the accompanying claims. It shall cover all functionally equivalent structures, methods and uses within the scope.

The present invention is not limited to the embodiments detailed above, and various modifications or modifications can be made within the scope of the claims of the present invention.

The present invention is widely used as a technique for draining cooling water circulating in a circulation path on the chiller machine side. In particular, it is suitably used as a technique for replacing the contaminated cooling water in the chiller machine side circulation path with the cooling water having improved water quality in the cooling tower side circulation path.

1; Cooling water circulation system, 2; Cooling tower side circulation path, 3; Chiller machine side circulation path, 5; Cooling tower, 6; Chiller machine, 6a; Tank, 7; Cooling target part, 17; Underwater impurity separator, 17a Drain port, 31; 1st connection pipe, 32; Control unit, 33; Electric valve, 34; Constant flow valve, 36; Differential pressure injector, 38; 2nd connection pipe, 39; Float valve, 52; Small diameter nozzle , 53; large diameter nozzle, 54; intake, 60; piping.

Claims (11)

A cooling water circulation system including a cooling tower side circulation path for circulating cooling water between the cooling tower and the chiller machine, and a chiller machine side circulation path for circulating cooling water between the chiller machine and the cooling target portion. There,
The cooling tower side circulation path and the chiller machine side circulation path are connected by a first connecting pipe for introducing cooling water circulating in the chiller machine side circulation path into the cooling tower side circulation path .
On one end side of the first connecting pipe, a differential pressure injector arranged in the pipe constituting the cooling tower side circulation path is provided.
The cooling water circulation system is characterized in that the differential pressure injector can introduce cooling water flowing through the first connecting pipe at a lower pressure than the cooling water to the cooling water flowing through the pipe . The differential pressure injector has a small-diameter nozzle that is connected to one end side of the first connecting pipe and whose axis is arranged along the flow direction of cooling water in the pipe, and a shaft whose axis is the shaft of the small-diameter nozzle. The large-diameter nozzle, which coincides with the center and is arranged so that the discharge port is located downstream of the discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe, and the cooling water flowing in the pipe are described. cooling water circulation system according to claim 1, further comprising a, and intake giving incorporated into the large-diameter nozzle produce negative pressure in front of the discharge opening of the small diameter nozzle. The large-diameter nozzle is arranged so as to cover the outer peripheral surface of the small-diameter nozzle.
The cooling water circulation system according to claim 2 , wherein the intake is formed in a portion of the large-diameter nozzle that covers the outer peripheral surface of the small-diameter nozzle. A plurality of intake ports are formed along the circumferential direction around the axis of the large-diameter nozzle, and are formed in an elliptical shape having a short axis along the circumferential direction around the axis of the large-diameter nozzle. The cooling water circulation system according to claim 3 . An underwater impurity separator for removing impurities contained in the circulating cooling water is provided in the feed path of the chiller machine side circulation path.
The underwater impurity separating device is provided with a drain port for draining cooling water together with the separated impurities.
The cooling water circulation system according to any one of claims 1 to 4 , wherein the first connecting pipe connects the drain port and the return path of the cooling tower side circulation path. A cooling water circulation system including a cooling tower side circulation path for circulating cooling water between the cooling tower and the chiller machine, and a chiller machine side circulation path for circulating cooling water between the chiller machine and the cooling target portion. There,
The cooling tower side circulation path and the chiller machine side circulation path are connected by a first connecting pipe for introducing cooling water circulating in the chiller machine side circulation path into the cooling tower side circulation path.
An underwater impurity separator for removing impurities contained in the circulating cooling water is provided in the feed path of the chiller machine side circulation path.
The underwater impurity separating device is provided with a drain port for draining cooling water together with the separated impurities.
The first connecting pipe is a cooling water circulation system characterized in that the drainage port and the return path of the cooling tower side circulation path are connected. The cooling water circulation system according to any one of claims 1 to 6, wherein the first connecting pipe is provided with an electric valve that opens and closes the first connecting pipe by controlling the opening and closing of a control unit. The cooling water circulation system according to any one of claims 1 to 7, wherein the first connecting pipe is provided with a washer rubber type constant flow valve. The claim that the cooling tower side circulation path and the chiller machine side circulation path are connected by a second connecting pipe for introducing cooling water circulating in the cooling tower side circulation path into the chiller machine side circulation path. The cooling water circulation system according to any one of 1 to 8. The cooling water circulation system according to claim 9, wherein the second connecting pipe connects a feeding path of the cooling tower side circulation path and a tank provided in the chiller machine. The cooling water circulation system according to claim 10, wherein a float valve for opening and closing the second connecting pipe is provided on one end side of the second connecting pipe as the water surface of the tank fluctuates up and down.

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