JP2018017471A - Coolant circulation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coolant circulation system which can easily drain a coolant in a chiller side circulation path and has a simple structure.SOLUTION: A coolant circulation system 1 includes: a cooling tower side circulation path 2 which circulates a coolant between a cooling tower 5 and a chiller 6; and a chiller side circulation path 3 which circulates the coolant between the chiller 6 and a cooling target part 7. The cooling tower side circulation path 2 and the chiller side circulation path 3 are connected by a first connection pipe 31 for introducing a coolant which circulates in the chiller side circulation path into the cooling tower side circulation path.SELECTED DRAWING: Figure 1

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 side circulation path.

  As a conventional cooling water circulation system, cooling water is circulated between a cooling tower side circulation path (also referred to as “primary circulation path”) for circulating cooling water between the cooling tower and the chiller machine, and between the chiller machine and the cooling target portion. A chiller-side circulation path (also referred to as “secondary circulation path”) that circulates the chiller is generally known (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 through each circulation path separately. And the administration of preservatives, bactericides, etc. by the contractor is usually managed and maintained mainly on the cooling tower side circulation path, temperature regulator connected to the tank of the chiller machine, mold cooling hole, etc. This is rarely performed in the cooling device or the like. Therefore, corrosion (rust) of cooling pipes directly connected to the product, hard scale mixed with silica, etc., adhere to the inside of the pipe, resulting in insufficient cooling, product quality variation, productivity reduction, equipment cost increase, etc. Cause various obstacles.

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

Japanese Patent Laid-Open No. 2005-21979

  However, in the conventional cooling water replacement device 100, since the cooling water in the tank 106a of the chiller machine 106 is manually drained, the draining operation is forgotten soon. Moreover, since the timing which drains is long, the water quality of the cooling water in the tank of a chiller machine deteriorates, and the inside of a tank will be in a rust mud state. For this reason, when draining, solid rust, scale, etc. may adhere to the float valve's operating part, or it may become clogged, resulting in malfunction and cooling from inside the tank. There is concern about the problem of overflowing water. Furthermore, 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.

  This invention is made | formed in view of the said present condition, and it aims at providing the cooling water circulation system of the simple structure which can drain | emit easily the cooling water of a chiller machine side circulation path.

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 part. A cooling water circulation system comprising a chiller side circulation path for circulating water, wherein the cooling tower side circulation path and the chiller side circulation path cool the cooling water circulating through the chiller side circulation path. The gist is that they are connected by a first connecting pipe for introduction into the tower-side circulation path.
According to a second aspect of the present invention, in the first aspect of the present invention, a differential pressure injector disposed in a pipe constituting the cooling tower side circulation path is provided on one end side of the first connection pipe. The differential pressure injector is capable of introducing cooling water flowing through the first connection pipe at a lower pressure than the cooling water with respect to the cooling water flowing through the pipe.
According to a third aspect of the present invention, in the second aspect of the present invention, the differential pressure injector is connected to one end side of the first connecting pipe, and an axial center thereof is in a flow direction of the cooling water in the pipe. The small-diameter nozzle arranged along the axis, and the axis coincides with the axis of the small-diameter nozzle, and the discharge port is positioned downstream of the discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe. A large-diameter nozzle disposed in the pipe, and an intake port that introduces cooling water flowing through 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 an outer peripheral surface of the small-diameter nozzle, and the intake port is the one of the large-diameter nozzle. The gist is that it is formed in a portion covering the outer peripheral surface of the small-diameter nozzle.
According to a fifth aspect of the present invention, in the invention of the fourth aspect, a plurality of the inlets are formed along a circumferential direction around the axis of the large diameter nozzle, and the large diameter nozzle The gist is that it is formed in an elliptical shape having a minor axis along the circumferential direction around the axis.
A sixth aspect of the present invention is the invention according to any one of the first to fifth aspects of the present invention, wherein the feed path of the chiller machine side circulation path has an underwater impurity for removing impurities contained in the circulating cooling water. A separator is provided, and the underwater impurity separator is provided with a drain outlet for draining cooling water together with the separated impurities, and the first connection pipe is connected to the drain outlet and the cooling tower side circulation. The gist is that the return path of the path is connected.
The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the first connection pipe is provided with an electric valve that opens and closes the first connection pipe by opening / closing control of a control unit. The gist is that it is provided.
The gist of 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 side circulation path circulate through 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 chiller side circulation path.
The invention according to claim 10 is the invention according to claim 9, wherein the second connection pipe connects a feed path of the cooling tower side circulation path and a tank provided in the chiller machine. Is the gist.
According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, a float valve that opens and closes the second connection pipe in accordance with vertical fluctuation of the water surface of the tank is provided at one end of the second connection pipe. 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 side circulation path are connected by the first connection pipe for introducing the cooling water circulating through the chiller side circulation path into the cooling tower side circulation path. Has been. Thereby, the cooling water which circulates through the chiller side circulation path via the first connection pipe is introduced into the cooling tower side circulation path. In addition, the administration of preservatives, disinfectants, etc. by a contractor is usually managed and maintained mainly in the cooling tower side circulation route, so that the quality of the cooling water introduced into the cooling tower side circulation route is improved. It becomes. Furthermore, it is not necessary to install a drainage facility such as a drainage tank in the vicinity of the chiller as in the conventional case, and a simple structure can be achieved.
Further, a differential pressure injector is provided on one end side of the first connection pipe, and the differential pressure injector is lower in pressure than the cooling water with respect to the cooling water flowing in the pipe. When cooling water flowing through the connecting pipe can be introduced, even if the cooling water flowing through the chiller side circulation path is at a lower pressure than the cooling water flowing through the cooling tower side circulation path, the chiller 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.
Further, 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 intake port, thereby discharging the small diameter nozzle. Negative pressure is generated in front of the outlet. Due to the suction force due to the negative pressure, the cooling water is drawn from the discharge port of the small-diameter nozzle at a faster flow rate than the cooling water flowing through the first connection pipe, and is drawn from the discharge port of the small-diameter nozzle and the cooling water taken in from the intake port. The combined cooling water is injected from the discharge port of the large-diameter nozzle into the pipe. Therefore, the cooling water flowing through the chiller side circulation path is introduced into the cooling tower side circulation path by the differential pressure injector having a simple structure.
Further, when the large-diameter nozzle is disposed so as to cover the outer peripheral surface of the small-diameter nozzle, and the intake port is formed in a portion covering the outer peripheral surface of the small-diameter nozzle of the large-diameter nozzle, Cooling water is effectively taken into the large-diameter nozzle from the intake port, and a large 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, the intake port is formed in a plurality along the circumferential direction around the axis of the large-diameter nozzle, and has an elliptical shape that becomes a short axis along the circumferential direction around the axis of the large-diameter nozzle. In this case, the cooling water is more effectively taken into the large-diameter nozzle from the intake port. 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 chiller machine side circulation route, a drain port is provided in the underwater impurity separation device, and the first connection pipe is connected to the drain port and the When the return path of the cooling tower side circulation path is connected, 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 separation device via the first connection pipe. .
Further, when the first connection pipe is provided with an electric valve that opens and closes the first connection pipe by opening / closing control of the control section, the cooling water flowing through the chiller side circulation path by the timer function of the control section, etc. 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 draining the cooling water.
Further, when the cooling tower side circulation path and the chiller side circulation path are connected by a second connection pipe, the cooling water circulating through the cooling tower side circulation path through the second connection pipe is chiller machine. Introduced into the side circulation path. Therefore, the cooling water contaminated by the chiller side circulation path and the cooling water whose water quality is improved by the cooling tower side circulation path can be easily replaced. As a result, compared to the case where cooling water is not replaced, corrosion (rust) such as cooling pipes directly connected to the product and hard scale mixed with silica are suppressed from adhering to the inside of the pipe. Reduction in efficiency is prevented, leading to stable quality.
Further, when the second connection 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 connected via the second connection pipe. 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 connection pipe, the second connection pipe is automatically opened and closed by the float valve as the water level of the tank fluctuates up and down.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
1 is an overall schematic diagram of a cooling water circulation system according to an embodiment. It is a principal part enlarged view of FIG. It is explanatory drawing for demonstrating the 1st connection pipe which concerns on an Example. It is explanatory drawing for demonstrating the differential pressure | voltage injector which concerns on an Example. It is a longitudinal cross-sectional view of the differential pressure injector. It is the side view which made a part of underwater impurity separation device concerning an example a section. It is explanatory drawing for demonstrating the cooling water circulation system which concerns on another form. It is explanatory drawing for demonstrating the conventional cooling water exchange apparatus.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Cooling water circulation system>
The cooling water circulation system according to this embodiment includes a cooling tower side circulation path (2) for circulating cooling water between the cooling tower (5) and the chiller machine (6), a chiller machine (6), and a cooling target part ( A chiller side circulation path (3) for circulating the cooling water between the cooling tower side circulation path (2) and the chiller side circulation path (3). Are connected by a first connection pipe (31) for introducing cooling water circulating in the chiller 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 introduction timing, etc. are not particularly limited. From the viewpoint of not affecting the circulating water temperature set in the chiller machine, the introduction amount of the cooling water is 0.1 to 0.1 of the circulating water quantity 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 the cooling water circulation system according to the present embodiment, for example, differential pressure injection arranged in the pipe (60) constituting the cooling tower side circulation path (2) on one end side of the first connection pipe (31). The differential pressure injector can introduce cooling water flowing through the first connection pipe (31) at a lower pressure than the cooling water with respect to the cooling water flowing through the pipe (60). (For example, see FIG. 4 etc.). In this case, for example, the differential pressure injector (36) can introduce cooling water flowing through the first connection pipe (31) with a smaller flow rate than the cooling water flowing through the pipe (60). Can be.

  In the case of the above-mentioned form, for example, the differential pressure injector (36) is connected to one end side of the first connection pipe (31) and the axis is along the flow direction of the cooling water in the pipe (60). The small-diameter nozzle (52) to be arranged has an axial center aligned with the axial center 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). A large-diameter nozzle (53) disposed in the pipe, and an intake port that introduces cooling water flowing in the pipe (60) into the large-diameter nozzle (53) and generates a negative pressure in front of the discharge port of the small-diameter nozzle (52). (54) can be provided (see, for example, FIGS. 4 and 5).

  In the case of the above-mentioned form, for example, the large-diameter nozzle (53) is disposed so as to cover the outer peripheral surface of the small-diameter nozzle (52), and the intake port (54) is the outer peripheral surface of the small-diameter nozzle of the large-diameter nozzle. (See, for example, FIGS. 4 and 5). Furthermore, for example, the intake port (54) is formed in plural 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 (53). 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, an underwater impurity separation device (17) for removing impurities contained in the circulating cooling water is provided in the feed path (3a) of the chiller side circulation path (3). The underwater impurity separation device (17) is provided with a drain port (17a) for draining the cooling water together with the separated impurities, and the first connection pipe (31) is connected to the drain port (17a). And a return path (2b) of the cooling tower side circulation path (2) (see, for example, FIG. 2).

  As the cooling water circulation system according to the present embodiment, for example, the first connection pipe (31) includes an electric valve (33) that opens and closes the first connection pipe by opening / closing control of the control unit (32). A form (for example, see FIG. 3 etc.) 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 side circulation path (3) include cooling water circulating through the cooling tower side circulation path as a chiller side circulation path. The form (for example, refer FIG. 2 etc.) connected by the 2nd connection pipe | tube (38) for introduce | transducing into can be mentioned.

  In the case of the above-described embodiment, for example, the second connection pipe (38) connects the feed 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). In this case, for example, a float valve (39) that opens and closes the second connection pipe as the water level of the tank (6a) fluctuates up and down is provided on one end side of the second connection pipe (38). it can.

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned 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 is a cooling tower side circulation path 2 (“” that circulates cooling water between the cooling tower 5 and the chiller machine 6. And a chiller side circulation path 3 (also referred to as a “secondary circulation path”) that circulates cooling water between the chiller machine 6 and the cooling target portion 7. . In addition, as the said cooling object part 7, an injection molding apparatus, a press processing apparatus, a welding apparatus, a heating apparatus, a trim apparatus etc. can be mentioned, for example.

  The cooling tower 5 includes a sprinkling tank 5a for collecting and sprinkling the cooling water whose temperature has risen sent from the chiller machine 6, a filler 5b for cooling the water sprinkled from the sprinkling tank 5a with air, and the outside air to the intake port. And a water tank 5d for collecting cooling water that has been cooled and dropped by the filler 5b. In this water tank 5d, a porous ceramic straight pipe 41B that constitutes a microbubble generator 40B that generates microbubbles in the cooling water in the water tank 5d, and a deposit such as slime that precipitates at the bottom of the water tank 5d. And an injector 9 for removal. Furthermore, the multifunctional net 10 is stretched so as to cover the air inlet of the cooling tower 5 and the water sprinkling 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 collecting cooling water whose temperature has risen sent from the object to be cooled 7, and a heat exchanger 6b for cooling the cooling water in the tank 6a. In the tank 6a, a straight pipe 41C made of a porous ceramic constituting a microbubble generator 40C for generating microbubbles in the cooling water in the tank 6a is provided.

  The cooling tower side circulation path 2 has one end side connected to the water tank 5d of the cooling tower 5 and the other end side connected to the heat exchanger 6b of the chiller machine 6, and one end side heat exchanger of the chiller machine 6. And a return path 2b connected to the watering tank 5a of the cooling tower 5 at the other end. The feed path 2 a is provided with a pressure feed pump 12 that pumps the coolant in the water tank 5 d of the cooling tower 5 toward the heat exchanger 6 b of the chiller 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 in the feed path 2a. The introduction pipe 13 is provided with a pumping pump 14 that pumps the cooling water in the water tank 5 d of the cooling tower 5 toward the injector 9. And the sediment which precipitates in the bottom part in the water tank 5d is removed because the cooling water pumped by the pumping pump 14 is injected from the injector 9.

  The introduction pipe 13 has a basket filter 16 containing a water treatment agent made of an inorganic substance, 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 particulate matter. And a tourmaline treatment device 18 for water. A drain pipe 21 that is opened and closed by an on-off valve 22 is connected to the drain port 17 a of the underwater impurity separation device 17. The on-off valve 22 is controlled to open and close by a control unit 24 in accordance with a detection value from a sensor 23 that detects the electrical conductivity of cooling water. Then, by opening the drain pipe 21, cooling water is drained together with impurities from the drain port 17 a of the underwater impurity separation device 17. 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 processes the cooling water.

  In the present embodiment, the underwater impurity separation device 17 provided in the introduction pipe 13 is exemplified, but the present invention is not limited to this. For example, as shown by a virtual line in FIG. Thus, the underwater impurity separation device 17 provided in the return path 2b (or the feed path 2a) of the cooling tower circulation path 2 may be used. Furthermore, in the present embodiment, the tourmaline processing apparatus 18 provided in the introduction pipe 13 is illustrated, but the present invention is not limited to this. For example, as shown by a virtual line in FIG. The tourmaline processing device 18 provided in the feed path 2a (or the return path 2b) of the cooling tower side circulation path 2 may be used. Furthermore, it is good also as the tourmaline processing apparatus 18 with which the return path | route 3b (or feed path | route 3a) mentioned later of the chiller machine side circulation path | route 3 is equipped.

  The chiller side circulation path 3 has one end side connected to the tank 6a of the chiller machine 6 and the other end side connected to the cooling target part 7, and one end side connected to the cooling target part 7 and the other end side. And a return path 3b connected to the tank 6a of the chiller machine 6. The feed path 3 a is provided with a pressure feed pump 26 that pumps the coolant in the tank 6 a of the chiller machine 6 toward the cooling target portion 7. Further, a bypass path 27 is provided on the downstream side of the pressure feed pump 26 in the feed path 3a. The bypass path 27 includes an underwater impurity separator 17 that removes impurities contained in the cooling water, and a microbubble generator 40A that generates microbubbles in the cooling water. The microbubble generator 40A includes a straight tube 41A made of a porous ceramic and a container 53 that contains tourmaline particulate matter. Therefore, the microbubble generator 40A has a function of making the tourmaline treated water by bringing the coolant into contact with the tourmaline particulate matter in addition to the function of generating the microbubbles in the coolant.

  As shown in FIG. 6, the underwater impurity separation device 17 includes a housing 70 having an inlet 70a and an outlet 70b. A baffle plate 71 is provided in the housing 70 so as to divide the internal space into an upper filtration chamber S1 and a lower sedimentation chamber S2. A plurality of filter media 72 are accommodated 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.

  The cooling tower side circulation path 2 and the chiller side circulation path 3 are, as shown in FIG. 2, a first connection for introducing the cooling water circulating through the chiller side circulation path 3 into the cooling tower side circulation path 2. They are connected by a pipe 31. The first connection pipe 31 connects the drain port 17 a of the underwater impurity separation device 17 and the return path 2 b of the cooling tower side circulation path 2.

  The first connection pipe 31 is provided with an electric valve 33 that opens and closes the first connection pipe 31 by opening / closing control of the control unit 32. The control unit 32 has a timer function, and the timer function can arbitrarily set the drainage time zone and the replacement drainage amount according to the water quality state, the temperature setting state, and the like of the cooling water. The first connection pipe 31 is provided with a washer rubber type constant flow valve 34. Further, as shown in FIG. 3, the first connection pipe 31 includes a ball valve 43, a PVC Y-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 are provided.

  Note that the ball valve 43 has a diameter of 25A because the water intake can be ensured by increasing the size of the water intake side. Further, the PVC Y-strainer 44 is provided for preventing equipment damage when a solid material enters, and is made of a transparent material that can visually check a clogged state. Moreover, since the filter 45 is likely to be clogged with the mesh 40 as a normal product, a 20 mesh that does not affect the drainage equipment is adopted. The electric valve 33 is a diaphragm type and has a problem such as biting, so a ball valve type is adopted. Further, the sight glass 46 is easy to visually check whether drainage is performed or whether the transparent glass and the water wheel are visible. Further, the washer-type constant flow valve 34 is unlikely to be clogged assuming that solid impurities have entered. In addition, the tube fitting 47 is employed to improve maintenance. In addition, the transparent Teflon (registered trademark) tube 48 is resistant to warm water, and can visually check the weather resistance and the quality of water. Further, the check valve 49 employs a lift type with high backflow prevention accuracy because a backflow action occurs while the apparatus is stopped. Further, the ball valve 50 has a 15A size because the smaller the drain diameter, the smoother the drainage.

  As shown in FIG. 4, one end side of the first connection pipe 31 is disposed in a pipe 60 (for example, an inner diameter; 70.3 mm, a longitudinal 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 can introduce cooling water flowing through the first connection pipe 31 at a lower pressure and a smaller flow rate than the cooling water flowing in the pipe 60.

  The differential pressure injector 36 is connected to one end side of the first connection pipe 31 and has a small diameter nozzle 52 arranged so that the axis is along the flow direction of the cooling water in the pipe 60, and the axis is the small diameter nozzle 52. A large-diameter nozzle 54 disposed so that the discharge port 53a is positioned downstream of the discharge port 52a of the small-diameter nozzle 52 in the flow direction of the cooling water, and the inside of the pipe 60. An intake 54 is provided that introduces 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). The small-diameter nozzle 52 has a nozzle hole whose diameter is reduced toward the discharge port 52a (for example, an inner diameter; 5 mm). The large-diameter nozzle 53 has a nozzle hole whose diameter increases toward the discharge port 53a. Further, the opening area of the discharge port 53 a of the large diameter nozzle 53 is larger than the opening area of the discharge port 52 a of the small diameter nozzle 52.

  The large diameter nozzle 53 is disposed so as to cover the outer peripheral surface of the small diameter nozzle 52. 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, the rear end portion of the large diameter nozzle 53 opposite to the discharge port 53a in the axial direction). . Further, a plurality (for example, six) of the intake ports 54 are formed along the circumferential direction around the axis of the large-diameter nozzle 53. Furthermore, each intake 54 is formed in an elliptical shape (for example, an elliptical area; 75.39 mm 2) that is a short axis along the circumferential direction around the axis of the large-diameter nozzle 53.

  The cooling tower side circulation path 2 and the chiller side circulation path 3 are, as shown in FIG. 2, a second connection for introducing cooling water circulating through the cooling tower side circulation path 2 into the chiller side circulation path 3. They are connected by a pipe 38. The second connection pipe 38 connects the feed path 2 a of the cooling tower side circulation path 2 and the tank 6 a of the chiller machine 6. Further, a float valve 39 that opens and closes the second connection pipe in accordance with the vertical fluctuation of the water surface of the tank 6a is provided on one end side of the second connection pipe 38.

(2) Action of Cooling Water Circulation System Next, the action of the cooling water circulation system 1 having the above configuration will be described. As shown in FIG. 1, the cooling water circulating through the cooling tower side circulation path 2 flows through the introduction pipe 13 when 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 the above, and when stored in the water tank 5d of the cooling tower 5, the water quality is improved by the action of the microbubble generator 40B, and the cooling water has excellent rust prevention and scale prevention and has a washing function. It is said. On the other hand, the cooling water circulating through the chiller side circulation path 3 is improved in water quality by the action of the underwater impurity separator 17 and the microbubble generator with tourmaline treatment function 40A, and is stored in the tank 6a of the chiller machine 6. At this time, the water quality is improved by the action of the microbubble generator 40C, and the cooling water has excellent rust prevention and scale prevention and has a cleaning function.

  The cooling water with improved water quality circulates in the circulation paths 2 and 3, thereby causing the scale to adhere to / deposit on mold cooling holes, cooling pipes, heat exchangers, etc. Flow path blockage / corrosion / rust / water leakage / slime / algae generation is suppressed. As a result, the quality of the molded product is stabilized (the mold can be maintained at a constant temperature; silver failure due to insufficient cooling is unlikely to occur), power saving, and energy saving (improves the heat exchange rate of the heat exchanger, greatly increasing power consumption) Reduced CO2 emissions due to power saving and water saving; reduced high-pressure troubles in heat exchangers), drastically reduced facility management costs (reduced electricity costs for facilities; reduced chemical cleaning costs; reduced cleaning maintenance costs) Various merits such as are 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 together with the impurities from the drain 17 a of the underwater impurity separation device 17 is supplied to the cooling tower via the first connection pipe 31. It is introduced into the return path 2 b of the side circulation path 2. At this time, with respect to 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 by the differential pressure injector 36, the cooling water is more than the cooling water. Cooling water (for example, water pressure: 0.3 MPa, flow rate: 1.8 L / min) flowing through the first connection pipe 31 at a low pressure and a small flow rate is introduced. On the other hand, when the float valve 39 is actuated as the water level of the tank 6a of the chiller machine 6 is lowered, the cooling water flowing through the feed path 2a of the cooling tower side circulation path 2 via the second connection pipe 38 is transferred to the tank 6a. be introduced. That is, the cooling water contaminated by the chiller side circulation path 3 and the cooling water whose water quality is improved by the cooling tower side circulation path 2 are exchanged.

  The amount of waste water discharged from the underwater impurity separation device 17 is within 2% of the chiller side circulating water amount from the constant flow valve 34 so that the cooling efficiency of the chiller unit 6 in the chiller side circulating path 3 is not affected. 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 unit 6, it is necessary to select the constant flow valve 34 by converting the drainage flow rate that meets the specifications.

  Here, the operation of the differential pressure injector 36 will be described. As shown in FIG. 4, in the first connection pipe 31, the drainage of the water amount 1.8 L / min controlled by the constant flow valve 34 is flowed at the flow rate of 1.8 L / min in the tube 56 (inner diameter: 5 mm). It is accelerated to 2.5 m / sec, and the flow rate of 2.5 m / sec is maintained in the small diameter nozzle 52 with the amount of water being 1.8 L / min. 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 52 a of the small-diameter nozzle 52 is discharged. Negative pressure is generated in the front. Due to this negative suction force (suction force five times that in the case where there is no intake port 54), the waste water flowing through the small diameter nozzle 52 maintains a flow rate of 2.5 m / sec with a water volume of 1.8 L / min. Then, it is pulled out from the discharge port 52a. The drained water with a flow rate of 1.8 L / min is combined with the cooling water with a flow rate of 10 L / min taken from the intake 54, resulting in a total amount of 11.8 L / min and a flow rate of 2.5 m in the large-diameter nozzle 53. / Sec and is discharged (injected) from the discharge port 53a of the large-diameter nozzle 53 into the pipe 60. The total amount of 11.8 L / min of cooling water discharged from the large-diameter nozzle 53 a into the pipe 60 is merged with 110 L / min of cooling water flowing outside the differential pressure injector 36, resulting in a total amount of 121.8 L / min. And a flow rate of 0.522 m / sec is sent to the upper watering tank 5a of the cooling tower 5 (see FIG. 1).

(3) Effects of the embodiment According to the cooling water circulation system 1 of the present embodiment, the cooling tower side circulation path 2 and the chiller side circulation path 3 circulate the cooling water circulating through the chiller side circulation path 3 in the cooling tower side circulation. The first connection pipe 31 for introduction into the path 2 is connected. Thereby, the cooling water circulating through the chiller side circulation path 3 is introduced into the cooling tower side circulation path 2 via the first connection pipe 31. The administration of preservatives, bactericides, etc. by the contractor is usually performed mainly for maintenance of the cooling tower side circulation path 2, so that the quality of the cooling water introduced into the cooling tower side circulation path 2 is improved. The Rukoto. Furthermore, 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 prior art, and a simple structure can be achieved.

  In the present embodiment, a differential pressure injector 36 is provided on one end side of the first connection pipe 31, and the differential pressure injector 36 is provided for the cooling water flowing in the pipe 60. It is possible to introduce cooling water flowing through the first connection pipe 31 at a lower pressure. Thereby, even if the cooling water flowing through the chiller side circulation path 3 is at a lower pressure than the cooling water flowing through the cooling tower side circulation path 2, the cooling water flowing through the chiller side circulation path 3 is cooled by the differential pressure injector 36. It is introduced into the tower side circulation path 2.

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

  In this embodiment, the large-diameter nozzle 53 is disposed 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. Thereby, the cooling water is effectively taken into the large-diameter nozzle 53 from the intake port 54, and a large 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.

  In this embodiment, a plurality of intake ports 54 are formed along the circumferential direction around the axis of the large-diameter nozzle 53 and short along the circumferential direction around the axis of the large-diameter nozzle 53. It is formed in an elliptical shape as an axis. Thereby, 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.

  In this embodiment, the feed path 3a of the chiller machine side circulation path 3 is provided with an underwater impurity separation device 17, and the underwater impurity separation device 17 is provided with a 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. Thereby, the cooling water is introduced into the return path 2 b of the cooling tower side circulation path 2 together with the impurities separated by the underwater impurity separation device 17 through the first connection pipe 31.

  In the present embodiment, the first connection pipe 31 is provided with an electric valve 33 that opens and closes the first connection pipe 31 by opening / closing control of the control unit 32. Thereby, drainage of the cooling water flowing through the chiller side circulation path 3 can be automated by the timer function of the control unit 32 or the like.

  In the present embodiment, the first connection pipe 31 is provided with a washer rubber type constant flow valve 34. This prevents clogging even if solid impurities pass through the constant flow valve 34 during cooling water drainage.

  In the present embodiment, the cooling tower side circulation path 2 and the chiller side circulation path 3 are connected by a second connection pipe 38. Thereby, the cooling water circulating through the cooling tower side circulation path 2 is introduced into the chiller side circulation path 3 via the second connection pipe 38. Therefore, the cooling water contaminated in the chiller 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, compared to the case where cooling water is not replaced, corrosion (rust) such as cooling pipes directly connected to the product and hard scale mixed with silica are suppressed from adhering to the inside of the pipe. Reduction in efficiency is prevented, leading to stable quality.

  In the present embodiment, the second connection pipe 38 connects the feed path 2 a of the cooling tower side circulation path 2 and the tank 6 a provided in the chiller machine 6. Thereby, the cooling water circulating through the cooling tower side circulation path 2 is introduced into the tank 6 a of the chiller machine 6 through the second connection pipe 38.

  Furthermore, in this embodiment, a float valve 39 is provided on one end side of the second connection pipe 38. As a result, the second connecting pipe 38 is automatically opened and closed by the float valve 39 as the water level of the tank 6a fluctuates up and down.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the said Example, although the form which provides the differential pressure | voltage injector 36 arrange | positioned in the piping 60 in the one end side of the 1st connection pipe 31 was illustrated, it is not limited to this, The cooling tower side circulation path 2 of When the circulation pressure of the chiller side circulation path 3 is higher than or equal 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 connection pipe 31. Instead, one end side of the first connection pipe 36 may be directly connected to the outer peripheral side of the pipe 60.

  Moreover, in the said Example, although the cooling water circulation system 1 which replaces the cooling water contaminated by the chiller side circulation path 3 and the cooling water improved in water quality by the cooling tower side circulation path 2 was illustrated, it is not limited to this. For example, while the cooling water contaminated by the chiller side circulation path 3 is introduced into the cooling tower side circulation path 2, the chiller side circulation path 3 is prepared separately from the cooling water of the cooling tower side circulation path 2. Alternatively, a cooling water circulation system for introducing cooling water may be used.

  Moreover, in the said Example, although the 1st connection pipe 31 which connects the drain port 17a of the underwater impurity separation apparatus 17 and the cooling tower side circulation path 2 was illustrated, it is not limited to this, For example, a chiller side circulation path 3 (feed path 3a or return path 3b) and the cooling tower side circulation path 2 (feed path 2a or return path 2b) may be used as a first connection pipe.

  Furthermore, in the said Example, although the 2nd connection pipe 38 which connects the cooling tower side circulation path 2 and the tank 6a of the chiller machine 6 was illustrated, it is not limited to this, For example, the cooling tower side circulation path 2 (feeding) The path 2a or the return path 2b) and the chiller side circulation path 3 (the feed path 3a or the return path 3b) may be directly connected as a second connection pipe.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes 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 that circulates in the chiller side circulation path. In particular, it is suitably used as a technique for exchanging the contaminated cooling water in the chiller side circulation path and the cooling water with improved water quality in the cooling tower side circulation path.

  DESCRIPTION OF SYMBOLS 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 separation device, 17a Drain port 31; first connection pipe 32; control unit 33; electric valve 34; constant flow valve 36; differential pressure injector 38; second connection pipe 39; float valve 52; small diameter nozzle 53; Large nozzle, 54; Inlet, 60; Piping.

Claims (11)

A cooling water circulation system comprising: a cooling tower side circulation path for circulating cooling water between a cooling tower and a chiller machine; and a chiller machine side circulation path for circulating cooling water between the chiller machine and a cooling target part. There,
The cooling tower side circulation path and the chiller side circulation path are connected by a first connection pipe for introducing cooling water circulating through the chiller side circulation path into the cooling tower side circulation path. Features a cooling water circulation system. On one end side of the first connection pipe, a differential pressure injector disposed in a pipe constituting the cooling tower side circulation path is provided,
2. The cooling water circulation system according to claim 1, wherein the differential pressure injector can introduce cooling water flowing through the first connection pipe at a lower pressure than the cooling water with respect to the cooling water flowing through the pipe.   The differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that has an axial center along the flow direction of the cooling water in the pipe, and the axial center of the small-diameter nozzle. A large-diameter nozzle disposed so as to coincide with the center and a discharge port 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 The cooling water circulation system according to claim 2, further comprising: an intake port that takes in the large-diameter nozzle and generates a negative pressure in front of the discharge port of the small-diameter nozzle. The large-diameter nozzle is disposed so as to cover the outer peripheral surface of the small-diameter nozzle,
The cooling water circulation system according to claim 3, wherein the intake port is formed in a portion of the large diameter nozzle that covers an outer peripheral surface of the small diameter nozzle.   A plurality of the intake ports are formed along the circumferential direction around the axis of the large-diameter nozzle, and are formed in an elliptical shape that becomes a short axis along the circumferential direction around the axis of the large-diameter nozzle. The cooling water circulation system according to claim 4. The feed path of the chiller machine side circulation path is provided with an underwater impurity separation device for removing impurities contained in the circulating cooling water,
The underwater impurity separation device is provided with a drain outlet for draining the cooling water together with the separated impurities,
The cooling water circulation system according to any one of claims 1 to 5, wherein the first connection pipe connects the drain port and a return path of the cooling tower side circulation path.   The cooling water circulation system according to any one of claims 1 to 6, wherein the first connection pipe includes an electric valve that opens and closes the first connection pipe by opening and closing control of a control unit.   The cooling water circulation system according to any one of claims 1 to 7, wherein the first connection pipe is provided with a washer rubber type constant flow valve.   The cooling tower side circulation path and the chiller side circulation path are connected by a second connection pipe for introducing cooling water circulating through the cooling tower side circulation path into the chiller 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 connection pipe connects a feed 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 that opens and closes the second connection pipe as the water level of the tank fluctuates is provided on one end side of the second connection pipe.

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