US20190301819A1 - Cooling-water circulation system - Google Patents
Cooling-water circulation system Download PDFInfo
- Publication number
- US20190301819A1 US20190301819A1 US16/317,426 US201716317426A US2019301819A1 US 20190301819 A1 US20190301819 A1 US 20190301819A1 US 201716317426 A US201716317426 A US 201716317426A US 2019301819 A1 US2019301819 A1 US 2019301819A1
- Authority
- US
- United States
- Prior art keywords
- cooling
- water
- circulation path
- side circulation
- chiller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000498 cooling water Substances 0.000 title claims abstract description 213
- 238000001816 cooling Methods 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 87
- 239000012535 impurity Substances 0.000 claims description 41
- 238000000926 separation method Methods 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 229940070527 tourmaline Drugs 0.000 description 11
- 229910052613 tourmaline Inorganic materials 0.000 description 11
- 239000011032 tourmaline Substances 0.000 description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000003657 drainage water Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 239000000645 desinfectant Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003755 preservative agent Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000589248 Legionella Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
- B05B7/26—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device
- B05B7/28—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid
- B05B7/30—Apparatus in which liquids or other fluent materials from different sources are brought together before entering the discharge device in which one liquid or other fluent material is fed or drawn through an orifice into a stream of a carrying fluid the first liquid or other fluent material being fed by gravity, or sucked into the carrying fluid
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/04—Other direct-contact heat-exchange apparatus the heat-exchange media both being liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
- C02F1/004—Processes for the treatment of water whereby the filtration technique is of importance using large scale industrial sized filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C2001/006—Systems comprising cooling towers, e.g. for recooling a cooling medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
- F28F2265/20—Safety or protection arrangements; Arrangements for preventing malfunction for preventing development of microorganisms
Definitions
- 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.
- a conventional cooling-water circulation system including a cooling-tower-side circulation path (also referred to as a generally “primary circulation path”) for circulating cooling water between a cooling tower and a chiller machine, and a chiller-machine-side circulation path (also referred to as a “secondary circulation path”) for circulating cooling water between the chiller machine and a cooling target part (e.g., refer to Patent Literature 1).
- a cooling-tower-side circulation path also referred to as a generally “primary circulation path” for circulating cooling water between a cooling tower and a chiller machine
- a chiller-machine-side circulation path also referred to as a “secondary circulation path” for circulating cooling water between the chiller machine and a cooling target part
- the cooling-tower-side circulation path and the chiller-machine-side circulation path are independent, and cooling water separately circulates in each circulation path. Then, manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path while hardly administering them to a temperature regulator, a mold cooling hole, another cooling device, and the like, which are connected to a tank of the chiller machine.
- corrosion (rust) of cooling pipes and the like directly connected to a product, and hard scales including silica, and the like, adhering to the inside of pipes cause insufficient cooling. This may cause various obstacles such as variations in product quality, reduction in productivity, increase of equipment cost, and the like.
- a cooling water replacing apparatus 100 for replacing cooling water in a tank 106 a of a chiller machine 106 , for example.
- the cooling water replacing apparatus 100 is configured such that a drain tank 104 is installed near the chiller machine 106 and the tank 106 a of the chiller machine 106 and the drain tank 104 is connected by a pipe 105 provided with a drain valve 105 a, and such that a drain pipe 107 provided with a conveying pump 107 a is connected at one end into the drain tank 104 . Then, at the timing of discharging cooling water, the drain valve 105 a is manually opened to drain the cooling water, and then the drain valve 105 a is closed manually.
- Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2005-21979
- the above conventional cooling water replacing apparatus 100 is configured to manually drain the cooling water in the tank 106 a of the chiller 106 , so that the draining work may be forgotten at any moment.
- water is drained at a long interval, so that cooling water in the tank of the chiller machine is deteriorated in water quality to cause the inside of the tank to be a rusty mud state.
- solid matters of rust and scales adhere to or enter an operating portion of a float valve, for example, to cause clogging troubles. This may result in malfunctioning to cause the cooling water overflows from the inside of the tank.
- drainage equipment such as a drain tank needs to be installed near the chiller machine to result in a complicated structure.
- the present invention is made in light of the above-described circumstances, and an object thereof is to provide a cooling-water circulation system having a simple structure that allows easy drainage of cooling water in a chiller-machine-side circulation path.
- the invention as defined in claim 1 relates to 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, wherein 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 through the chiller-machine-side circulation path into the cooling-tower-side circulation path.
- the invention as defined in claim 2 relates to the cooling-water circulation system according to claim 1 , wherein the first connection pipe is provided at its one end with a differential pressure injector disposed in a pipe constituting the cooling-tower-side circulation path, and the differential pressure injector is able to introduce cooling water flowing through the first connection pipe to cooling water flowing through the pipe, under a lower pressure than the cooling water flowing through the pipe.
- the invention as defined in claim 3 relates to the cooling-water circulation system according to claim 2 , wherein the differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that is disposed such that its axis is along a flow direction of cooling water in the pipe, a large-diameter nozzle that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe, and an intake port for taking the cooling water flowing through the pipe into the large-diameter nozzle to generate negative pressure in front of the discharge port of the small-diameter nozzle.
- the differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that is disposed such that its axis is along a flow direction of cooling water in the pipe, a large-dia
- the invention as defined in claim 4 relates to the cooling-water circulation system according to claim 3 , wherein the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle, and the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle.
- the invention as defined in claim 5 relates to the cooling-water circulation system according to claim 4 , wherein a plurality of the intake ports is formed along a circumferential direction around the axis of the large-diameter nozzle, and each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle.
- the invention as defined in claim 6 relates to the cooling-water circulation system according to any one of claims 1 to 5 , wherein the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device for removing impurities contained in cooling water circulating the chiller-machine-side circulation path, the water impurity separation device includes a drain port for draining the cooling water together with separated impurities, and the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path.
- the invention as defined in claim 7 relates to the cooling-water circulation system 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 and closing control of a control unit.
- the invention as defined in claim 8 relates to the cooling-water circulation system according to any one of claims 1 to 7 , wherein the first connection pipe is provided with a constant flow valve of a washer rubber type.
- the invention as defined in claim 9 relates to the cooling-water circulation system according to any one of claims 1 to 8 , wherein the cooling-tower-side circulation path and the chiller-machine-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-machine-side circulation path.
- the invention as defined in claim 10 relates to 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 invention as defined in claim 11 relates to the cooling-water circulation system according to claim 10 , wherein the second connection pipe is provided at its one end with a float valve for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank.
- the cooling-water circulation system of the present invention is configured such that the cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a first connection pipe for introducing cooling water circulating through the chiller-machine-side circulation path into the cooling-tower-side circulation path.
- This causes the cooling water circulating through the chiller-machine-side circulation path to be introduced into the cooling-tower-side circulation path via the first connection pipe.
- manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path, so that the cooling water introduced into the cooling-tower-side circulation path is improved in water quality.
- drainage equipment such as a drain tank does not need to be installed near the chiller machine, so that a simple structure can be obtained.
- the differential pressure injector When the first connection pipe is provided at its one end with a differential pressure injector that is capable of introducing cooling water flowing through the first connection pipe into cooling water flowing through the pipe, under pressure lower than the cooling water flowing the pipe, the differential pressure injector introduces even cooling water flowing through the chiller-machine-side circulation path under pressure lower than the cooling water flowing through the cooling-tower-side circulation path into the cooling-tower-side circulation path.
- the differential pressure injector When the differential pressure injector includes a small-diameter nozzle, a large-diameter nozzle, and an intake port, taking cooling water flowing through the pipe into the large-diameter nozzle from the intake port causes negative pressure to be generated in front of a discharge port of the small-diameter nozzle.
- the negative pressure causes suction force to draw out cooling water from the discharge port of the small-diameter nozzle at a higher flow velocity than the cooling water flowing through the first connection pipe.
- cooling water taken in through the intake port is combined with the cooling water drawn out from the discharge port of the small-diameter nozzle to be injected into the pipe through the discharge port of the large-diameter nozzle.
- the differential pressure injector with a simple structure introduces cooling water flowing through the chiller-machine-side circulation path into the cooling-tower-side circulation path.
- the large-diameter nozzle When the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle and the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle, cooling water is effectively taken into the large-diameter nozzle from the intake port to cause a larger negative pressure to be generated in front of the discharge port of the small-diameter nozzle. This further increases an injection force of the differential pressure injector.
- each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle, cooling water is effectively taken into the large-diameter nozzle from each of the intake ports. This further increases an injection force of the differential pressure injector.
- the chiller-machine-side circulation path When the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device provided with a drain port, and the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path, cooling water together with impurities separated by the water impurity separation device is introduced into the return path of the cooling-tower-side circulation path via the first connection pipe.
- the cooling water flowing through the chiller-machine-side circulation path can be automatically drained with a timer function and the like of the control unit.
- cooling water circulating through the cooling-tower-side circulation path is introduced into the chiller-machine-side circulation path via the second connection pipe.
- This enables the cooling water contaminated in the chiller-machine-side circulation path and the cooling water improved in water quality in the cooling-tower-side circulation path to be easily exchanged with each other.
- corrosion (rust) of cooling pipes directly connected to a product, and hard scales including silica and the like adhering to the inside of pipes are suppressed as compared with when cooling water is not exchanged. This prevents deterioration in cooling efficiency to lead to quality stability.
- connection pipe connects the feed path of the cooling-tower-side circulation path and a tank provided in the chiller machine, cooling water circulating through the cooling-tower-side circulation path is introduced into the tank of the chiller machine via the second connection pipe.
- the float valve automatically opens and closes the second connection pipe in accordance with vertical movement of a water surface in the tank.
- FIG. 1 is a general schematic view of a cooling water circulation system according to an example.
- FIG. 2 is an enlarged view of a main part of FIG. 1 .
- FIG. 3 is an explanatory view for illustrating a first connection pipe according to the example.
- FIG. 4 is an explanatory view for illustrating a differential pressure injector according to the example.
- FIG. 5 is a longitudinal sectional view of the differential pressure injector.
- FIG. 6 is a side view of a water impurity separation device according to the example, illustrating a part of it as a sectional view.
- FIG. 7 is an explanatory view for illustrating a cooling-water circulation system according to another aspect.
- FIG. 8 is an explanatory view for illustrating a conventional cooling-water replacing apparatus.
- a cooling-water circulation system ( 1 ) includes a cooling-tower-side circulation path ( 2 ) for circulating cooling water between a cooling tower ( 5 ) and a chiller machine ( 6 ), and a chiller-machine-side circulation path ( 3 ) for circulating cooling water between the chiller machine ( 6 ) and a cooling target part ( 7 ).
- the cooling-tower-side circulation path ( 2 ) and the chiller-machine-side circulation path ( 3 ) are connected by a first connection pipe ( 31 ) for introducing cooling water circulating through the chiller-machine-side circulation path into the cooling-tower-side circulation path (e.g., refer to FIGS. 1 and 2 ).
- the amount of cooling water introduced by the first connection pipe ( 31 ), timing of the introduction, and the like are not particularly limited. From the viewpoint of not affecting a circulating water temperature set in the chiller machine, the amount of cooling water introduced is preferably 0.1% to 5% (more preferably 0.1% to 3%, and particularly 0.1% to 2%) of the amount of the cooling water circulating through the chiller-machine-side circulation path ( 3 ).
- the cooling-water circulation system may be configured such that the first connection pipe ( 31 ) is provided at its one end with a differential pressure injector ( 36 ) disposed in a pipe ( 60 ) constituting the cooling-tower-side circulation path ( 2 ), and such that the differential pressure injector is capable of introducing cooling water flowing through the first connection pipe ( 31 ) into cooling water flowing through the pipe ( 60 ), under pressure lower than the cooling water flowing through the pipe ( 60 ) (e.g., refer to FIG. 4 , etc.).
- the differential pressure injector ( 36 ) may be configured to be able to introduce cooling water flowing through the first connection pipe ( 31 ) to the cooling water flowing through the pipe ( 60 ), at a smaller flow rate than the cooling water flowing through the pipe ( 60 ), for example.
- the differential pressure injector ( 36 ) configured as described above may include a small-diameter nozzle ( 52 ) that is connected to one end of the first connection pipe ( 31 ) and that is disposed such that its axis is along a flow direction of cooling water in the pipe ( 60 ), a large-diameter nozzle ( 53 ) that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe ( 60 ), and an intake port ( 54 ) for taking the cooling water flowing through the pipe ( 60 ) into the large-diameter nozzle ( 53 ) to generate negative pressure in front of the discharge port of the small-diameter nozzle ( 52 ), for example (e.g., refer to FIGS. 4 and 5 , etc.).
- the differential pressure injector ( 36 ) configured as described above may be configured such that the large-diameter nozzle ( 53 ) is disposed so as to cover an outer peripheral surface of the small-diameter nozzle ( 52 ), and such that the intake port ( 54 ) is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle, for example (e.g., refer to FIGS. 4 and 5 , etc.).
- a plurality of the intake ports ( 54 ) may be formed along a circumferential direction around the axis of the large-diameter nozzle ( 53 ), and each of the intake ports may be formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle, for example.
- the cooling-water circulation system may be configured such that the chiller-machine-side circulation path ( 3 ) is provided in its feed path ( 3 a ) with a water impurity separation device ( 17 ) for removing impurities contained in cooling water circulating the chiller-machine-side circulation path ( 3 ), the water impurity separation device ( 17 ) including a drain port ( 17 a ) for draining the cooling water together with separated impurities, and such that the first connection pipe ( 31 ) connects the drain port ( 17 a ) and the return path ( 2 b ) of the cooling-tower-side circulation path ( 2 ) (e.g., refer to FIG. 2 , etc.), for example.
- the cooling-water circulation system may be configured such that the first connection pipe ( 31 ) is provided with an electric valve ( 33 ) for opening and closing the first connection pipe by opening and closing control of a control unit ( 32 ), for example (e.g., refer to FIG. 3 , etc.).
- the first connection pipe ( 31 ) may be configured to include a constant flow valve ( 34 ) of a washer rubber type, for example (e.g., refer to FIG. 3 , etc.).
- the cooling-water circulation system may be configured such that the cooling-tower-side circulation path ( 2 ) and the chiller-machine-side circulation path ( 3 ) are connected by a second connection pipe ( 38 ) for introducing cooling water circulating cooling-tower-side circulation path into the chiller-machine-side circulation path, for example (e.g., refer to FIG. 2 , etc.).
- the second connection pipe ( 38 ) may connect the feed path ( 2 a ) of the cooling-tower-side circulation path ( 2 ) and the tank ( 6 a ) provided in the chiller machine ( 6 ), for example (e.g., refer to FIG. 2 , etc.).
- the second connection pipe ( 38 ) may be provided at its one end with a float valve ( 39 ) for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank ( 6 a ), for example.
- a cooling-water circulation system 1 includes a cooling-tower-side circulation path 2 (also referred to as a “primary circulation path”) for circulating cooling water between a cooling tower 5 and a chiller machine 6 , and a chiller-machine-side circulation path 3 (also referred to as a “secondary circulation path”) for circulating the cooling water between the chiller machine 6 and a cooling target part 7 .
- the cooling target part 7 include an injection molding device, a press working device, a welding device, a heating device, a trimming device, and the like.
- the cooling tower 5 includes a water sprinkling tank 5 a for storing and sprinkling cooling water increased in temperature fed from the chiller machine 6 , a filling material 5 b for cooling the water sprinkled from the water sprinkling tank 5 a with air, a blower 5 c for taking in outside air through a suction port to allow the outside air to pass through the inside of the filling material 5 b, and a water tank 5 d for storing the cooling water dropped while being cooled by the filling material 5 b.
- the water tank 5 d is provided in its inside with a straight pipe 41 B made of porous ceramic, constituting a microbubble generator 40 B for generating microbubbles in cooling water in the water tank 5 d, and an injector 9 for removing precipitate such as slime precipitated on the bottom of the water tank 5 d.
- a multifunctional net 10 is stretched so as to cover the suction port and the water sprinkling tank 5 a of the cooling tower 5 .
- the multifunction net 10 not only prevents algae, slime, legionella bacteria, and the like from occurring in the cooling tower 5 but also improves cooling efficiency therein.
- the chiller machine 6 includes a tank 6 a for storing cooling water increased in temperature fed from the cooling target part 7 , and a heat exchanger 6 b for cooling the cooling water in the tank 6 a.
- the tank 6 a is provided in its inside with a straight pipe 41 C made of porous ceramics, constituting a microbubble generator 40 C for generating microbubbles in cooling water in the tank 6 a.
- the cooling-tower-side circulation path 2 includes a feed path 2 a that is connected at one end to the water tank 5 d of the cooling tower 5 and at the other end to the heat exchanger 6 b of the chiller machine 6 , and a return path 2 b that has one end connected to the heat exchanger 6 b of the chiller machine 6 and the other end connected to the water sprinkling tank 5 a of the cooling tower 5 .
- the feed path 2 a is provided with a pressure pump 12 for pumping the cooling water in the water tank 5 d of the cooling tower 5 toward the heat exchanger 6 b of the chiller machine 6 .
- an introduction pipe 13 has one end connected to the injector 9 and the other end connected to the feed path 2 a upstream of the pressure pump 12 .
- the introduction pipe 13 is provided with a pressure feed pump 14 for pumping the cooling water in the water tank 5 d of the cooling tower 5 toward the injector 9 . Then, the injector 9 injects the cooling water pumped by the pressure pump 14 to remove precipitate precipitating on the bottom of the water tank 5 d.
- the introduction pipe 13 includes a basket filter 16 containing a water treatment agent made of an inorganic substance or the like, a water impurity separation device 17 for removing impurities contained in the cooling water, and a tourmaline treatment device 18 for forming tourmaline-treated water by bringing the cooling water into contact with tourmaline granules.
- the water impurity separation device 17 has a drain port 17 a connected to a drain pipe 21 that is opened and closed by an on-off valve 22 .
- the on-off valve 22 is controlled to be opened and closed by a control unit 24 in accordance with a detection value from a sensor 23 for detecting electric conductivity of cooling water.
- 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 for magnetically treating cooling water.
- the present invention is not limited to this.
- the water impurity separation device 17 may be provided in the return path 2 b (or the feed path 2 a ) of the cooling tower circulation path 2 instead of or in addition to the introduction pipe 13 , as illustrated in FIG. 1 by an imaginary line.
- the tourmaline treatment device 18 provided in the introduction pipe 13 is shown in the present example, the present invention is not limited to this.
- the tourmaline treatment device 18 may be provided in the feed path 2 a (or the return path 2 b ) of the cooling-tower-side circulation path 2 instead of or in addition to the introduction pipe 13 , as illustrated in FIG. 1 by an imaginary line.
- the tourmaline treatment device 18 may be provided in the return path 3 b (or the feed path 3 a ) described below of the chiller-machine-side circulation path 3 .
- the chiller-machine-side circulation path 3 includes a feed path 3 a that has one end connected to the tank 6 a of the chiller machine 6 and the other end connected to the cooling target part 7 , and a return path 3 b that has one end connected to the cooling target part 7 and the other end connected to the tank 6 a of the chiller machine 6 .
- the feed path 3 a is provided with a pressure pump 26 for pumping cooling water in the tank 6 a of the chiller machine 6 toward the cooling target part 7 .
- a bypass path 27 is provided downstream of the pressure pump 26 in the feed path 3 a.
- the bypass path 27 includes the water impurity separation device 17 for removing impurities contained in cooling water, and the microbubble generator 40 A for generating microbubbles in cooling water.
- the microbubble generator 40 A includes a straight pipe 41 A made of porous ceramics, and a container 53 containing the tourmaline granules.
- the microbubble generator 40 A has not only a function of generating microbubbles in cooling water but also a function of bringing the cooling water into contact with tourmaline granules to form tourmaline-treated water.
- the water impurity separation device 17 includes a housing 70 provided with an inflow port 70 a and an outflow port 70 b.
- the housing 70 is provided in its inside with a baffle plate 71 such that its internal space is vertically partitioned into an upper filtration chamber S 1 and a lower precipitation chamber S 2 .
- the upper filtration chamber S 1 contains a plurality of filter media 72 therein.
- the housing 70 is provided at its bottom with a drain port 17 a communicating with the lower precipitation chamber S 2 .
- the cooling-tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by a first connection pipe 31 for introducing cooling water circulating through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2 .
- the first connection pipe 31 connects the drain port 17 a of the water 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 and closing control of a control unit 32 .
- the control unit 32 has a timer function that enables a drainage time period and the amount of exchanging drainage to be arbitrarily set in accordance with water quality conditions, a temperature setting state, and the like of cooling water.
- the first connection pipe 31 is provided with a constant flow valve 34 of a washer rubber type. As illustrated in FIG.
- the first connection pipe 31 is provided with a ball valve 43 , a PVC Y-type strainer 44 , a filter 45 , a sight glass 46 , a tube fitting 47 , a transparent Teflon (registered trademark) tube 48 , a chuck valve 49 , and a ball valve 50 .
- the bail valve 43 uses a bore diameter of 25 A because the amount of water taken can be secured by increasing its water intake side in size.
- the PVC Y-type strainer 44 is provided for preventing damage to equipment when a solid matter enters the equipment, and is made of a transparent material allowing a clogging state to be visually checked.
- the filter 45 uses a filter of 20 mesh that does not affect drainage apparatuses because a common filter of 40 mesh is likely to cause clogging.
- the electric valve 33 uses a ball valve type because a diaphragm type may cause trouble such as biting.
- the sight glass 46 not only allows transparent glass and a water wheel to be easily and visually checked for checking whether water is drained, or the with ease, but also allows a flow rate to be easily checked.
- the constant flow valve 34 of a washer type is less likely to cause clogging on the assumption of entry of solid impurities.
- the tube fitting 47 is used to improve maintenance efficiency.
- the transparent Teflon (registered trademark) tube 48 is resistant to hot water and has weather resistance, and enables a visual check for a state of contamination in water.
- the chuck valve 49 uses a lift type with high accuracy of reverse-flow prevention because a reverse-flow action occurs during stopping of the device.
- the ball valve 50 uses a ball valve of size 15 A because a drain port with a smaller diameter allows water to be smoothly drained.
- the first connection pipe 31 is provided at its one end with a differential pressure injector 36 disposed in a pipe 60 (e.g., having an inner diameter of 70.3 mm, and a longitudinal sectional area of 3879.5 mm 2 ) constituting the cooling-tower-side circulation path 2 .
- the differential pressure injector 36 is configured to be able to introduce cooling water flowing through the first connection pipe 31 to the cooling water flowing through the pipe 60 , under a lower pressure and at a smaller flow rate than the cooling water flowing through the pipe 60 .
- the differential pressure injector 36 includes a small-diameter nozzle 52 that is connected to one end of the first connection pipe 31 and that is disposed such that its axis is along a flow direction of cooling water in the pipe 60 , a large-diameter nozzle 54 that is disposed such that its axis aligns with the axis of the small-diameter nozzle 52 , and such that its discharge port 53 a is positioned downstream of a discharge port 52 a of the small-diameter nozzle 52 in the flow direction of the cooling water in the pipe 60 , and an intake port 54 for taking the cooling water flowing through the pipe 60 into the large-diameter nozzle 53 to generate negative pressure in front of the discharge port 52 a of the small-diameter nozzle 52 (refer to FIG.
- the small-diameter nozzle 52 has a nozzle hole that decreases in diameter toward the discharge port 52 a (e.g., having an inner diameter of 5 mm).
- the large-diameter nozzle 53 has a nozzle hole that increase in diameter toward the discharge port 53 a.
- the discharge port 53 a of the large-diameter nozzle 53 has an opening area more than an 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 an outer peripheral surface of the small-diameter nozzle 52 .
- the intake port 54 is formed in a portion (specifically, a rear end portion of the large-diameter nozzle 53 , being axially opposite to the discharge port 53 a ) of the large-diameter nozzle 53 , covering the outer circumferential surface of the small-diameter nozzle 52 .
- a plurality (e.g., six) of the intake ports 54 is formed along a circumferential direction around the axis of the large-diameter nozzle 53 .
- each of the intake ports 54 is formed in an elliptical shape (e.g., having an ellipse area of 75.39 mm2) having a minor axis along the circumferential direction around the axis of the large-diameter nozzle 53 .
- the cooling tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by a second connection pipe 38 for introducing cooling water circulating through the cooling-tower-side circulation path 2 into the chiller machine-side circulation path 3 .
- 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 .
- the second connection pipe 38 is provided at its one end with a float valve 39 for opening and closing the second connection pipe in accordance with vertical movement of the water surface in the tank 6 a.
- cooling water circulation system 1 having the above configuration will be described.
- cooling water circulating in the cooling-tower-side circulation path 2 is improved in water quality not only when flowing through the introduction pipe 13 by action of the basket filter 16 , the water impurity separation device 17 , the tourmaline treatment device 18 , and the magnetic water treatment device 19 , but also when being stored in the water tank 5 d of the cooling tower 5 by action of the microbubble generator 40 B.
- This causes the cooling water to not only be excellent in rust prevention and scaling resistance, but also have a cleaning function.
- cooling water circulating through the chiller-machine-side circulation path 3 is improved in water quality not only by action of the water impurity separation device 17 and the microbubble generator 40 A with a tourmaline treatment function, but also by action of the microbubble generator 40 C when being stored in the tank 6 a of the chiller machine 6 .
- This causes the cooling water to not only be excellent in rust prevention and scaling resistance, but also have a cleaning function.
- cooling water improved in water quality through the respective circulation paths 2 and 3 suppresses the following problems due to deterioration in water quality of cooling water: adhesion, deposition, and clogging of a flow channel, of scales; corrosion, rust, and water leakage; and occurrence of slime and algae, in a mold cooling hole, a cooling pipe, a heat exchanger, and the like.
- the following various merits can be obtained: stable quality of a molding (a mold can be maintained at a constant temperature, and a silver defect due to insufficient cooling is less likely to occur); power saving and energy saving (large reduction in power consumption by increase in a heat exchange rate of a heat exchanger, reduction in the amount of emission of CO 2 through power saving and water saving, and reduction of trouble about abnormal high pressure of a heat exchanger); and large reduction in facility management cost (reduction of electricity charges for facilities, reduction of chemical cleaning cost, and reduction of cleaning maintenance cost).
- the cooling-water circulation system 1 is configured such that when the electric valve 33 is opened by a timer function of the control unit 32 , cooling water together with impurities is introduced into the return path 2 b of the cooling-tower-side circulation path 2 from the drain port 17 a of the water impurity separation device 17 via the first connection pipe 31 .
- the differential pressure injector 36 injects cooling water (with a water pressure of 0.3 MPa, and at a flow rate of 1.8 L/min) flowing through the first connection pipe 31 , under a lower pressure and at a smaller flow rate than the cooling water (with a water pressure of 0.4 MPa, and at a flow rate of 120 L/min) flowing through the pipe 60 constituting the cooling-tower-side circulation path 2 , into the cooling water flowing through the pipe 60 .
- the float valve 39 is operated in accordance with descent of the water surface of the tank 6 a of the chiller machine 6 , the cooling water flowing through the feed path 2 a of the cooling-tower-side circulation path 2 is introduced to the tank 6 a via the second connection pipe 38 . That is, the cooling water contaminated in the chiller-machine-side circulation path 3 and the cooling water improved in water quality in the cooling-tower-side circulation path 2 are exchanged with each other.
- the amount of water discharged from the water impurity separation device 17 is preferably set within 2% of the amount of circulating water in the chiller-machine-side circulation path 3 so as not to affect cooling efficiency of the chiller machine 6 in the chiller-machine-side circulation path 3 and the water is introduced into the return path 2 b of the cooling-tower-side circulation path 2 from the constant flow valve 34 through the chuck valve 49 .
- the amount of circulating water in the heat exchanger 6 b varies by using the chiller machine 6 , so that the constant flow valve 34 needs to be selected in terms of a drainage flow rate corresponding to specifications of the water impurity separation device 17 .
- the drainage water drawn with the amount of 1.8 L/min merges with cooling water with an amount of 10 L/min taken from the intake port 54 to become water with a total amount of 11.8L/min while being accelerated to a flow velocity of 2.5 m/sec in the large-diameter nozzle 53 , and then is discharged (injected) into the pipe 60 from the discharge port 53 a of the large-diameter nozzle 53 .
- the cooling water with the total amount of 11.8 L/min discharged from the large-diameter nozzle 53 a into the pipe 60 merges with cooling water with an amount of 110 L/min flowing outside the differential pressure injector 36 to become water with a total amount of 121.8 L/min at a flow velocity of 0.522 m/sec, and then is fed to the water sprinkling tank 5 a in an upper portion of the cooling tower 5 (refer to FIG. 1 ).
- the cooling-water circulation system 1 of the present example is configured such that the cooling-tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by the first connection pipe 31 for introducing cooling water circulating through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2 .
- This causes the cooling water circulating through the chiller-machine-side circulation path 3 to be introduced into the cooling-tower-side circulation path 2 via the first connection pipe 31 .
- manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path 2 , so that the cooling water introduced into the cooling-tower-side circulation path 2 is improved in water quality.
- drainage equipment such as a drain tank does not need to be installed near the chiller machine 6 , so that a simple structure can be obtained.
- the present example is configured such that the first connection pipe 31 is provided at its one end with the differential pressure injector 36 , and such that the differential pressure injector 36 is able to introduce cooling water flowing through the first connection pipe 31 to the cooling water flowing through the pipe 60 , under a lower pressure than the cooling water flowing through the pipe 60 .
- the differential pressure injector introduces the cooling water flowing through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2 .
- the present example is configured such that the differential pressure injector 36 includes the small-diameter nozzle 52 , the large-diameter nozzle 53 , and the intake port 54 .
- taking cooling water flowing through the pipe 60 into the large-diameter nozzle 53 from the intake port 54 causes negative pressure to be generated in front of the discharge port 52 a of the small-diameter nozzle 52 .
- the negative pressure causes suction force to draw out cooling water from the discharge port 52 a of the small-diameter nozzle 52 at a higher flow velocity (e.g., a flow velocity about four times a flow velocity of cooling water flowing through the first connection pipe 31 ) than the cooling water flowing through the first connection pipe 31 .
- cooling water taken in through the intake port 54 is combined with cooling water drawn out from the discharge port 52 a of the small-diameter nozzle 52 to be injected into the pipe 60 through the discharge port 53 a of the large-diameter nozzle 63 .
- the differential pressure injector 36 with a simple structure introduces cooling water flowing through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2 .
- the present example is configured such that the large-diameter nozzle 53 is disposed so as to cover the outer peripheral surface of the small-diameter nozzle 52 , and such that the intake port 54 is formed in a portion of the large-diameter nozzle 53 , covering the outer peripheral surface of the small-diameter nozzle 52 .
- the cooling water is effectively taken into the large-diameter nozzle 53 from the intake port 54 to generate a larger negative pressure in front of the discharge port of the small-diameter nozzle 52 . This further increases an injection force of the differential pressure injector 36 .
- the present example is configured such that a plurality of the intake ports 54 is formed along the circumferential direction around the axis of the large-diameter nozzle 53 , and such that each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle 53 .
- the cooling water is more effectively taken into the large-diameter nozzle 53 from the intake port 54 .
- This further increases an injection force of the differential pressure injector 36 .
- the present example is configured such that the chiller-machine-side circulation path 3 is provided in its feed path 3 a with the water impurity separation device 17 that includes the drain port 17 a, and such that the first connection pipe 31 connects the drain port 17 a and the return path 2 b of the cooling-tower-side circulation path 2 .
- the cooling water is introduced into the return path 2 b of the cooling-tower-side circulation path 2 , together with impurities separated by the water impurity separation device 17 , via the first connection pipe 31 .
- the present example is configured such that the first connection pipe 31 is provided with the electric valve 33 that opens and closes the first connection pipe 31 by opening and closing control of the control unit 32 .
- the cooling water flowing through the chiller-machine-side circulation path 3 can be automatically drained with the timer function and the like of the control unit 32 .
- the present example is configured such that the first connection pipe 31 is provided with the constant flow valve 34 of a washer rubber type. This prevents clogging even when solid impurities pass through the constant flow valve 34 at the time of draining cooling water.
- the present example is configured such that the cooling-tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by the second connection pipe 38 .
- This causes the cooling water circulating through the cooling-tower-side circulation path 2 to be introduced into the chiller-machine-side circulation path 3 via the second connection pipe 38 .
- the cooling water contaminated in the chiller-machine-side circulation path 3 and the cooling water improved in water quality in the cooling-tower-side circulation path 2 can be easily exchanged with each other.
- corrosion (rust) of cooling pipes directly connected to a product, and hard scales including silica and the like adhering to the inside of pipes are suppressed as compared with when cooling water is not exchanged. This prevents deterioration in cooling efficiency to lead to quality stability.
- the present example is configured such that 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 . This causes the cooling water circulating through the cooling-tower-side circulation path 2 to be introduced into the tank 6 a of the chiller machine 6 via the second connection pipe 38 .
- the present example is configured such that the second connection pipe 38 is provided at its one end with the float valve 39 . Accordingly, the float valve 39 automatically opens and closes the second connecting pipe 38 in accordance with vertical movement of a water surface in the tank 6 a.
- the present invention is not limited to the example described above, and can be variously modified within the scope of the present invention depending on purpose and use. That is, while the above example shows an aspect in which the first connection pipe 31 is provided at its one end with the differential pressure injector 36 disposed in the pipe 60 , for example, the present invention is not limited thereto.
- the first connection pipe 31 may be directly connected at one end to an outer peripheral portion of the pipe 60 without providing the differential pressure injector 36 at the one end of the first connection pipe 31 , as illustrated in FIG. 7 , for example.
- the cooling-water circulation system may be configured such that while the cooling water contaminated in the chiller-machine-side circulation path 3 is introduced into the cooling-tower-side circulation path 2 , cooling water prepared separately from the cooling water in the cooling-tower-side circulation path 2 is introduced into the chiller-machine-side circulation path 3 , for example.
- the first connection pipe 31 may directly connect the chiller-machine-side circulation path 3 (the feed path 3 a or the return path 3 b ) and the cooling-tower-side circulation path 2 (the feed path 2 a or the return path 2 b ), for example.
- the second connection pipe 38 may directly connect the cooling-tower-side circulation path 2 (the feed path 2 a or the return path 2 b ) and chiller-tower-side circulation path 3 (the feed path 3 a or the return path 3 b ), for example.
- the present invention is widely used as a technique for draining cooling water circulating through a chiller-machine-side circulation path.
- it is suitably used as a technique for exchanging cooling water contaminated in the chiller-machine-side circulation path with the cooling water improved in water quality in the cooling-tower-side circulation path.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The present cooling-water circulation system includes 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 6 and a cooling target part. The cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a first connection pipe for introducing cooling water circulating in the chiller-machine-side circulation path into the cooling-tower-side circulation path.
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.
- There is generally known a conventional cooling-water circulation system including a cooling-tower-side circulation path (also referred to as a generally “primary circulation path”) for circulating cooling water between a cooling tower and a chiller machine, and a chiller-machine-side circulation path (also referred to as a “secondary circulation path”) for circulating cooling water between the chiller machine and a cooling target part (e.g., refer to Patent Literature 1).
- In the conventional cooling-water circulation system, the cooling-tower-side circulation path and the chiller-machine-side circulation path are independent, and cooling water separately circulates in each circulation path. Then, manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path while hardly administering them to a temperature regulator, a mold cooling hole, another cooling device, and the like, which are connected to a tank of the chiller machine. As a result, corrosion (rust) of cooling pipes and the like directly connected to a product, and hard scales including silica, and the like, adhering to the inside of pipes, cause insufficient cooling. This may cause various obstacles such as variations in product quality, reduction in productivity, increase of equipment cost, and the like.
- For this reason, as illustrated in
FIG. 8 , there is proposed a coolingwater replacing apparatus 100 for replacing cooling water in atank 106 a of achiller machine 106, for example. The coolingwater replacing apparatus 100 is configured such that adrain tank 104 is installed near thechiller machine 106 and thetank 106 a of thechiller machine 106 and thedrain tank 104 is connected by apipe 105 provided with adrain valve 105 a, and such that adrain pipe 107 provided with aconveying pump 107 a is connected at one end into thedrain tank 104. Then, at the timing of discharging cooling water, thedrain valve 105 a is manually opened to drain the cooling water, and then thedrain valve 105 a is closed manually. - Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2005-21979
- Unfortunately, the above conventional cooling
water replacing apparatus 100 is configured to manually drain the cooling water in thetank 106 a of thechiller 106, so that the draining work may be forgotten at any moment. In addition, water is drained at a long interval, so that cooling water in the tank of the chiller machine is deteriorated in water quality to cause the inside of the tank to be a rusty mud state. As a result, when water is drained, solid matters of rust and scales adhere to or enter an operating portion of a float valve, for example, to cause clogging troubles. This may result in malfunctioning to cause the cooling water overflows from the inside of the tank. Further, drainage equipment such as a drain tank needs to be installed near the chiller machine to result in a complicated structure. - The present invention is made in light of the above-described circumstances, and an object thereof is to provide a cooling-water circulation system having a simple structure that allows easy drainage of cooling water in a chiller-machine-side circulation path.
- In order to solve the above problem, the invention as defined in
claim 1 relates to 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, wherein 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 through the chiller-machine-side circulation path into the cooling-tower-side circulation path. - The invention as defined in
claim 2 relates to the cooling-water circulation system according toclaim 1, wherein the first connection pipe is provided at its one end with a differential pressure injector disposed in a pipe constituting the cooling-tower-side circulation path, and the differential pressure injector is able to introduce cooling water flowing through the first connection pipe to cooling water flowing through the pipe, under a lower pressure than the cooling water flowing through the pipe. - The invention as defined in
claim 3 relates to the cooling-water circulation system according toclaim 2, wherein the differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that is disposed such that its axis is along a flow direction of cooling water in the pipe, a large-diameter nozzle that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe, and an intake port for taking the cooling water flowing through the pipe into the large-diameter nozzle to generate negative pressure in front of the discharge port of the small-diameter nozzle. - The invention as defined in claim 4 relates to the cooling-water circulation system according to
claim 3, wherein the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle, and the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle. - The invention as defined in claim 5 relates to the cooling-water circulation system according to claim 4, wherein a plurality of the intake ports is formed along a circumferential direction around the axis of the large-diameter nozzle, and each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle.
- The invention as defined in
claim 6 relates to the cooling-water circulation system according to any one ofclaims 1 to 5, wherein the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device for removing impurities contained in cooling water circulating the chiller-machine-side circulation path, the water impurity separation device includes a drain port for draining the cooling water together with separated impurities, and the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path. - The invention as defined in
claim 7 relates to the cooling-water circulation system according to any one ofclaims 1 to 6, wherein the first connection pipe is provided with an electric valve that opens and closes the first connection pipe by opening and closing control of a control unit. - The invention as defined in claim 8 relates to the cooling-water circulation system according to any one of
claims 1 to 7, wherein the first connection pipe is provided with a constant flow valve of a washer rubber type. - The invention as defined in
claim 9 relates to the cooling-water circulation system according to any one ofclaims 1 to 8, wherein the cooling-tower-side circulation path and the chiller-machine-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-machine-side circulation path. - The invention as defined in
claim 10 relates to the cooling-water circulation system according toclaim 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 invention as defined in claim 11 relates to the cooling-water circulation system according to
claim 10, wherein the second connection pipe is provided at its one end with a float valve for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank. - The cooling-water circulation system of the present invention is configured such that the cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a first connection pipe for introducing cooling water circulating through the chiller-machine-side circulation path into the cooling-tower-side circulation path. This causes the cooling water circulating through the chiller-machine-side circulation path to be introduced into the cooling-tower-side circulation path via the first connection pipe. Then, manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path, so that the cooling water introduced into the cooling-tower-side circulation path is improved in water quality. Unlike the conventional cooling-water circulation system, drainage equipment such as a drain tank does not need to be installed near the chiller machine, so that a simple structure can be obtained.
- When the first connection pipe is provided at its one end with a differential pressure injector that is capable of introducing cooling water flowing through the first connection pipe into cooling water flowing through the pipe, under pressure lower than the cooling water flowing the pipe, the differential pressure injector introduces even cooling water flowing through the chiller-machine-side circulation path under pressure lower than the cooling water flowing through the cooling-tower-side circulation path 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, taking cooling water flowing through the pipe into the large-diameter nozzle from the intake port causes negative pressure to be generated in front of a discharge port of the small-diameter nozzle. The negative pressure causes suction force to draw out cooling water from the discharge port of the small-diameter nozzle at a higher flow velocity than the cooling water flowing through the first connection pipe. Then, cooling water taken in through the intake port is combined with the cooling water drawn out from the discharge port of the small-diameter nozzle to be injected into the pipe through the discharge port of the large-diameter nozzle. Thus, the differential pressure injector with a simple structure introduces cooling water flowing through the chiller-machine-side circulation path into the cooling-tower-side circulation path.
- When the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle and the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle, cooling water is effectively taken into the large-diameter nozzle from the intake port to cause a larger negative pressure to be generated in front of the discharge port of the small-diameter nozzle. This further increases an injection force of the differential pressure injector.
- When not only a plurality of the intake ports is formed along a circumferential direction around the axis of the large-diameter nozzle, but also each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle, cooling water is effectively taken into the large-diameter nozzle from each of the intake ports. This further increases an injection force of the differential pressure injector.
- When the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device provided with a drain port, and the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path, cooling water together with impurities separated by the water impurity separation device is introduced into the return path of the cooling-tower-side circulation path via the first connection pipe.
- When the first connection pipe is provided with an electric valve for opening and closing the first connection pipe by opening and closing control of a control unit, the cooling water flowing through the chiller-machine-side circulation path can be automatically drained with a timer function and the like of the control unit.
- When the first connection pipe is provided with a constant flow valve of a washer rubber type, clogging is prevented even when solid impurities pass through the constant flow valve at the time of draining cooling water.
- When the cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a second connection pipe, cooling water circulating through the cooling-tower-side circulation path is introduced into the chiller-machine-side circulation path via the second connection pipe. This enables the cooling water contaminated in the chiller-machine-side circulation path and the cooling water improved in water quality in the cooling-tower-side circulation path to be easily exchanged with each other. As a result, corrosion (rust) of cooling pipes directly connected to a product, and hard scales including silica and the like adhering to the inside of pipes, are suppressed as compared with when cooling water is not exchanged. This prevents deterioration in cooling efficiency to lead to quality stability.
- When the second connection pipe connects the feed path of the cooling-tower-side circulation path and a tank provided in the chiller machine, cooling water circulating through the cooling-tower-side circulation path is introduced into the tank of the chiller machine via the second connection pipe.
- When the second connection pipe is provided at its one end with a float valve, the float valve automatically opens and closes the second connection pipe in accordance with vertical movement of a water surface in the tank.
- The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:
-
FIG. 1 is a general schematic view of a cooling water circulation system according to an example. -
FIG. 2 is an enlarged view of a main part ofFIG. 1 . -
FIG. 3 is an explanatory view for illustrating a first connection pipe according to the example. -
FIG. 4 is an explanatory view for illustrating a differential pressure injector according to the example. -
FIG. 5 is a longitudinal sectional view of the differential pressure injector. -
FIG. 6 is a side view of a water impurity separation device according to the example, illustrating a part of it as a sectional view. -
FIG. 7 is an explanatory view for illustrating a cooling-water circulation system according to another aspect. -
FIG. 8 is an explanatory view for illustrating a conventional cooling-water replacing apparatus. - The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description is taken with the drawings making apparent to those skilled in the art how the forms of the present invention may be embodied in practice.
- <Cooling Water Circulation System>
- A cooling-water circulation system (1) according to the present embodiment includes a cooling-tower-side circulation path (2) for circulating cooling water between a cooling tower (5) and a chiller machine (6), and a chiller-machine-side circulation path (3) for circulating cooling water between the chiller machine (6) and a cooling target part (7). The cooling-tower-side circulation path (2) and the chiller-machine-side circulation path (3) are connected by a first connection pipe (31) for introducing cooling water circulating through the chiller-machine-side circulation path into the cooling-tower-side circulation path (e.g., refer to
FIGS. 1 and 2 ). - The amount of cooling water introduced by the first connection pipe (31), timing of the introduction, and the like are not particularly limited. From the viewpoint of not affecting a circulating water temperature set in the chiller machine, the amount of cooling water introduced is preferably 0.1% to 5% (more preferably 0.1% to 3%, and particularly 0.1% to 2%) of the amount of the cooling water circulating through the chiller-machine-side circulation path (3).
- The cooling-water circulation system according to the present embodiment may be configured such that the first connection pipe (31) is provided at its one end with a differential pressure injector (36) disposed in a pipe (60) constituting the cooling-tower-side circulation path (2), and such that the differential pressure injector is capable of introducing cooling water flowing through the first connection pipe (31) into cooling water flowing through the pipe (60), under pressure lower than the cooling water flowing through the pipe (60) (e.g., refer to
FIG. 4 , etc.). In this case, the differential pressure injector (36) may be configured to be able to introduce cooling water flowing through the first connection pipe (31) to the cooling water flowing through the pipe (60), at a smaller flow rate than the cooling water flowing through the pipe (60), for example. - The differential pressure injector (36) configured as described above may include a small-diameter nozzle (52) that is connected to one end of the first connection pipe (31) and that is disposed such that its axis is along a flow direction of cooling water in the pipe (60), a large-diameter nozzle (53) that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe (60), and an intake port (54) for taking the cooling water flowing through the pipe (60) into the large-diameter nozzle (53) to generate negative pressure in front of the discharge port of the small-diameter nozzle (52), for example (e.g., refer to
FIGS. 4 and 5 , etc.). - The differential pressure injector (36) configured as described above may be configured such that the large-diameter nozzle (53) is disposed so as to cover an outer peripheral surface of the small-diameter nozzle (52), and such that the intake port (54) is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle, for example (e.g., refer to
FIGS. 4 and 5 , etc.). In addition, a plurality of the intake ports (54) may be formed along a circumferential direction around the axis of the large-diameter nozzle (53), and each of the intake ports may be formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle, for example. - The cooling-water circulation system according to the present embodiment may be configured such that the chiller-machine-side circulation path (3) is provided in its feed path (3 a) with a water impurity separation device (17) for removing impurities contained in cooling water circulating the chiller-machine-side circulation path (3), the water impurity separation device (17) including a drain port (17 a) for draining the cooling water together with separated impurities, and such that the first connection pipe (31) connects the drain port (17 a) and the return path (2 b) of the cooling-tower-side circulation path (2) (e.g., refer to
FIG. 2 , etc.), for example. - The cooling-water circulation system according to the present embodiment may be configured such that the first connection pipe (31) is provided with an electric valve (33) for opening and closing the first connection pipe by opening and closing control of a control unit (32), for example (e.g., refer to
FIG. 3 , etc.). In addition, the first connection pipe (31) may be configured to include a constant flow valve (34) of a washer rubber type, for example (e.g., refer toFIG. 3 , etc.). - The cooling-water circulation system according to the present embodiment may be configured such that the cooling-tower-side circulation path (2) and the chiller-machine-side circulation path (3) are connected by a second connection pipe (38) for introducing cooling water circulating cooling-tower-side circulation path into the chiller-machine-side circulation path, for example (e.g., refer to
FIG. 2 , etc.). - In the aspect described above, the second connection pipe (38) may connect the feed path (2 a) of the cooling-tower-side circulation path (2) and the tank (6 a) provided in the chiller machine (6), for example (e.g., refer to
FIG. 2 , etc.). In this case, the second connection pipe (38) may be provided at its one end with a float valve (39) for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank (6 a), for example. - The reference numeral in parentheses of each component described in the above embodiment indicates a correspondence with a specific component described in an example to be described below.
- Hereinafter, the present invention will be described in detail using an example with reference to the drawings.
- (1) Configuration of Cooling Water Circulation System
- As illustrated in
FIG. 1 , a cooling-water circulation system 1 according to the present example includes a cooling-tower-side circulation path 2 (also referred to as a “primary circulation path”) for circulating cooling water between a cooling tower 5 and achiller machine 6, and a chiller-machine-side circulation path 3 (also referred to as a “secondary circulation path”) for circulating the cooling water between thechiller machine 6 and acooling target part 7. Examples of thecooling target part 7 include an injection molding device, a press working device, a welding device, a heating device, a trimming device, and the like. - The cooling tower 5 includes a
water sprinkling tank 5 a for storing and sprinkling cooling water increased in temperature fed from thechiller machine 6, a fillingmaterial 5 b for cooling the water sprinkled from thewater sprinkling tank 5 a with air, ablower 5 c for taking in outside air through a suction port to allow the outside air to pass through the inside of the fillingmaterial 5 b, and awater tank 5 d for storing the cooling water dropped while being cooled by the fillingmaterial 5 b. Thewater tank 5 d is provided in its inside with astraight pipe 41B made of porous ceramic, constituting amicrobubble generator 40B for generating microbubbles in cooling water in thewater tank 5 d, and aninjector 9 for removing precipitate such as slime precipitated on the bottom of thewater tank 5 d. In addition, a multifunctional net 10 is stretched so as to cover the suction port and thewater sprinkling tank 5 a of the cooling tower 5. The multifunction net 10 not only prevents algae, slime, legionella bacteria, and the like from occurring in the cooling tower 5 but also improves cooling efficiency therein. - The
chiller machine 6 includes atank 6 a for storing cooling water increased in temperature fed from thecooling target part 7, and aheat exchanger 6 b for cooling the cooling water in thetank 6 a. Thetank 6 a is provided in its inside with astraight pipe 41C made of porous ceramics, constituting amicrobubble generator 40C for generating microbubbles in cooling water in thetank 6 a. - The cooling-tower-
side circulation path 2 includes afeed path 2 a that is connected at one end to thewater tank 5 d of the cooling tower 5 and at the other end to theheat exchanger 6 b of thechiller machine 6, and areturn path 2 b that has one end connected to theheat exchanger 6 b of thechiller machine 6 and the other end connected to thewater sprinkling tank 5 a of the cooling tower 5. Thefeed path 2 a is provided with apressure pump 12 for pumping the cooling water in thewater tank 5 d of the cooling tower 5 toward theheat exchanger 6 b of thechiller machine 6. In addition, anintroduction pipe 13 has one end connected to theinjector 9 and the other end connected to thefeed path 2 a upstream of thepressure pump 12. Theintroduction pipe 13 is provided with apressure feed pump 14 for pumping the cooling water in thewater tank 5 d of the cooling tower 5 toward theinjector 9. Then, theinjector 9 injects the cooling water pumped by thepressure pump 14 to remove precipitate precipitating on the bottom of thewater tank 5 d. - The
introduction pipe 13 includes abasket filter 16 containing a water treatment agent made of an inorganic substance or the like, a waterimpurity separation device 17 for removing impurities contained in the cooling water, and atourmaline treatment device 18 for forming tourmaline-treated water by bringing the cooling water into contact with tourmaline granules. The waterimpurity separation device 17 has adrain port 17 a connected to adrain pipe 21 that is opened and closed by an on-offvalve 22. The on-offvalve 22 is controlled to be opened and closed by acontrol unit 24 in accordance with a detection value from asensor 23 for detecting electric conductivity of cooling water. When thedrain pipe 21 is opened, the cooling water is drained together with impurities from thedrain port 17 a of the waterimpurity separation device 17. Theintroduction pipe 13 is provided with abypass path 25, and thebypass path 25 is provided with a magneticwater treatment device 19 for magnetically treating cooling water. - While the water
impurity separation device 17 provided in theintroduction pipe 13 is shown in the present example, the present invention is not limited to this. For example, the waterimpurity separation device 17 may be provided in thereturn path 2 b (or thefeed path 2 a) of the coolingtower circulation path 2 instead of or in addition to theintroduction pipe 13, as illustrated inFIG. 1 by an imaginary line. While thetourmaline treatment device 18 provided in theintroduction pipe 13 is shown in the present example, the present invention is not limited to this. For example, thetourmaline treatment device 18 may be provided in thefeed path 2 a (or thereturn path 2 b) of the cooling-tower-side circulation path 2 instead of or in addition to theintroduction pipe 13, as illustrated inFIG. 1 by an imaginary line. In addition, thetourmaline treatment device 18 may be provided in thereturn path 3 b (or thefeed path 3 a) described below of the chiller-machine-side circulation path 3. - The chiller-machine-
side circulation path 3 includes afeed path 3 a that has one end connected to thetank 6 a of thechiller machine 6 and the other end connected to thecooling target part 7, and areturn path 3 b that has one end connected to thecooling target part 7 and the other end connected to thetank 6 a of thechiller machine 6. Thefeed path 3 a is provided with apressure pump 26 for pumping cooling water in thetank 6 a of thechiller machine 6 toward thecooling target part 7. In addition, abypass path 27 is provided downstream of thepressure pump 26 in thefeed path 3 a. Thebypass path 27 includes the waterimpurity separation device 17 for removing impurities contained in cooling water, and themicrobubble generator 40A for generating microbubbles in cooling water. Themicrobubble generator 40A includes astraight pipe 41A made of porous ceramics, and acontainer 53 containing the tourmaline granules. Thus, themicrobubble generator 40A has not only a function of generating microbubbles in cooling water but also a function of bringing the cooling water into contact with tourmaline granules to form tourmaline-treated water. - As illustrated in
FIG. 6 , the waterimpurity separation device 17 includes ahousing 70 provided with aninflow port 70 a and anoutflow port 70 b. Thehousing 70 is provided in its inside with abaffle plate 71 such that its internal space is vertically partitioned into an upper filtration chamber S1 and a lower precipitation chamber S2. The upper filtration chamber S1 contains a plurality offilter media 72 therein. Thehousing 70 is provided at its bottom with adrain port 17 a communicating with the lower precipitation chamber S2. - As illustrated in
FIG. 2 , the cooling-tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by afirst connection pipe 31 for introducing cooling water circulating through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2. Thefirst connection pipe 31 connects thedrain port 17 a of the waterimpurity separation device 17 and thereturn path 2 b of the cooling-tower-side circulation path 2. - The
first connection pipe 31 is provided with anelectric valve 33 that opens and closes thefirst connection pipe 31 by opening and closing control of acontrol unit 32. Thecontrol unit 32 has a timer function that enables a drainage time period and the amount of exchanging drainage to be arbitrarily set in accordance with water quality conditions, a temperature setting state, and the like of cooling water. Thefirst connection pipe 31 is provided with aconstant flow valve 34 of a washer rubber type. As illustrated inFIG. 3 , thefirst connection pipe 31 is provided with aball valve 43, a PVC Y-type strainer 44, afilter 45, asight glass 46, a tube fitting 47, a transparent Teflon (registered trademark)tube 48, achuck valve 49, and aball valve 50. - The
bail valve 43 uses a bore diameter of 25A because the amount of water taken can be secured by increasing its water intake side in size. The PVC Y-type strainer 44 is provided for preventing damage to equipment when a solid matter enters the equipment, and is made of a transparent material allowing a clogging state to be visually checked. Thefilter 45 uses a filter of 20 mesh that does not affect drainage apparatuses because a common filter of 40 mesh is likely to cause clogging. Theelectric valve 33 uses a ball valve type because a diaphragm type may cause trouble such as biting. Further, thesight glass 46 not only allows transparent glass and a water wheel to be easily and visually checked for checking whether water is drained, or the with ease, but also allows a flow rate to be easily checked. Theconstant flow valve 34 of a washer type is less likely to cause clogging on the assumption of entry of solid impurities. The tube fitting 47 is used to improve maintenance efficiency. The transparent Teflon (registered trademark)tube 48 is resistant to hot water and has weather resistance, and enables a visual check for a state of contamination in water. Thechuck valve 49 uses a lift type with high accuracy of reverse-flow prevention because a reverse-flow action occurs during stopping of the device. Theball valve 50 uses a ball valve of size 15A because a drain port with a smaller diameter allows water to be smoothly drained. - As illustrated in
FIG. 4 , thefirst connection pipe 31 is provided at its one end with adifferential pressure injector 36 disposed in a pipe 60 (e.g., having an inner diameter of 70.3 mm, and a longitudinal sectional area of 3879.5 mm2) constituting the cooling-tower-side circulation path 2. Thedifferential pressure injector 36 is configured to be able to introduce cooling water flowing through thefirst connection pipe 31 to the cooling water flowing through thepipe 60, under a lower pressure and at a smaller flow rate than the cooling water flowing through thepipe 60. - The
differential pressure injector 36 includes a small-diameter nozzle 52 that is connected to one end of thefirst connection pipe 31 and that is disposed such that its axis is along a flow direction of cooling water in thepipe 60, a large-diameter nozzle 54 that is disposed such that its axis aligns with the axis of the small-diameter nozzle 52, and such that itsdischarge port 53 a is positioned downstream of adischarge port 52 a of the small-diameter nozzle 52 in the flow direction of the cooling water in thepipe 60, and anintake port 54 for taking the cooling water flowing through thepipe 60 into the large-diameter nozzle 53 to generate negative pressure in front of thedischarge port 52 a of the small-diameter nozzle 52 (refer toFIG. 5 ). The small-diameter nozzle 52 has a nozzle hole that decreases in diameter toward thedischarge port 52 a (e.g., having an inner diameter of 5 mm). The large-diameter nozzle 53 has a nozzle hole that increase in diameter toward thedischarge port 53 a. In addition, thedischarge port 53 a of the large-diameter nozzle 53 has an opening area more than an opening area of thedischarge port 52 a of the small-diameter nozzle 52. - The large-
diameter nozzle 53 is disposed so as to cover an outer peripheral surface of the small-diameter nozzle 52. Theintake port 54 is formed in a portion (specifically, a rear end portion of the large-diameter nozzle 53, being axially opposite to thedischarge port 53 a) of the large-diameter nozzle 53, covering the outer circumferential surface of the small-diameter nozzle 52. In addition, a plurality (e.g., six) of theintake ports 54 is formed along a circumferential direction around the axis of the large-diameter nozzle 53. Further, each of theintake ports 54 is formed in an elliptical shape (e.g., having an ellipse area of 75.39 mm2) having a minor axis along the circumferential direction around the axis of the large-diameter nozzle 53. - As illustrated in
FIG. 2 , the cooling tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by asecond connection pipe 38 for introducing cooling water circulating through the cooling-tower-side circulation path 2 into the chiller machine-side circulation path 3. Thesecond connection pipe 38 connects thefeed path 2 a of the cooling-tower-side circulation path 2 and thetank 6 a of thechiller machine 6. Thesecond connection pipe 38 is provided at its one end with afloat valve 39 for opening and closing the second connection pipe in accordance with vertical movement of the water surface in thetank 6 a. - (2) Action of cooling-water circulation system
- Next, action of the cooling
water circulation system 1 having the above configuration will be described. As illustrated inFIG. 1 , cooling water circulating in the cooling-tower-side circulation path 2 is improved in water quality not only when flowing through theintroduction pipe 13 by action of thebasket filter 16, the waterimpurity separation device 17, thetourmaline treatment device 18, and the magneticwater treatment device 19, but also when being stored in thewater tank 5 d of the cooling tower 5 by action of themicrobubble generator 40B. This causes the cooling water to not only be excellent in rust prevention and scaling resistance, but also have a cleaning function. Meanwhile, cooling water circulating through the chiller-machine-side circulation path 3 is improved in water quality not only by action of the waterimpurity separation device 17 and themicrobubble generator 40A with a tourmaline treatment function, but also by action of themicrobubble generator 40C when being stored in thetank 6 a of thechiller machine 6. This causes the cooling water to not only be excellent in rust prevention and scaling resistance, but also have a cleaning function. - Then, circulating the cooling water improved in water quality through the
respective circulation paths - In addition, the cooling-
water circulation system 1 is configured such that when theelectric valve 33 is opened by a timer function of thecontrol unit 32, cooling water together with impurities is introduced into thereturn path 2 b of the cooling-tower-side circulation path 2 from thedrain port 17 a of the waterimpurity separation device 17 via thefirst connection pipe 31. At this time, thedifferential pressure injector 36 injects cooling water (with a water pressure of 0.3 MPa, and at a flow rate of 1.8 L/min) flowing through thefirst connection pipe 31, under a lower pressure and at a smaller flow rate than the cooling water (with a water pressure of 0.4 MPa, and at a flow rate of 120 L/min) flowing through thepipe 60 constituting the cooling-tower-side circulation path 2, into the cooling water flowing through thepipe 60. Meanwhile, when thefloat valve 39 is operated in accordance with descent of the water surface of thetank 6 a of thechiller machine 6, the cooling water flowing through thefeed path 2 a of the cooling-tower-side circulation path 2 is introduced to thetank 6 a via thesecond connection pipe 38. That is, the cooling water contaminated in the chiller-machine-side circulation path 3 and the cooling water improved in water quality in the cooling-tower-side circulation path 2 are exchanged with each other. - The amount of water discharged from the water
impurity separation device 17 is preferably set within 2% of the amount of circulating water in the chiller-machine-side circulation path 3 so as not to affect cooling efficiency of thechiller machine 6 in the chiller-machine-side circulation path 3 and the water is introduced into thereturn path 2 b of the cooling-tower-side circulation path 2 from theconstant flow valve 34 through thechuck valve 49. However, the amount of circulating water in theheat exchanger 6 b varies by using thechiller machine 6, so that theconstant flow valve 34 needs to be selected in terms of a drainage flow rate corresponding to specifications of the waterimpurity separation device 17. - Here, action of the
differential pressure injector 36 will be described. As illustrated inFIG. 4 , in thefirst connection pipe 31, drainage water with an amount of 1.8 L/min controlled by theconstant flow valve 34 is accelerated to a flow velocity of 2.5 m/min in the tube 56 (having an inner diameter of 5 mm) while the amount of 1.8 L/min is maintained, and is maintained at the flow velocity of 2.5 m/sec in the small-diameter nozzle 52 while having the amount of 1.8 L/min. Meanwhile, when a part (an amount of 10 L/min of water) of cooling water flowing through thepipe 60, having a total amount of 120 L/min, is taken into the large-diameter nozzle 53 from theintake port 54, negative pressure is generated in front of thedischarge port 52 a of the small-diameter nozzle 52. Suction force caused by the negative pressure (a suction force five times that when theintake port 54 is not provided) draws out the drainage water flowing through the small-diameter nozzle 52 from thedischarge port 52 a while the drainage water still has the amount of 1.8 L/min and is maintained at the flow velocity of 2.5 m/sec. The drainage water drawn with the amount of 1.8 L/min merges with cooling water with an amount of 10 L/min taken from theintake port 54 to become water with a total amount of 11.8L/min while being accelerated to a flow velocity of 2.5 m/sec in the large-diameter nozzle 53, and then is discharged (injected) into thepipe 60 from thedischarge port 53 a of the large-diameter nozzle 53. The cooling water with the total amount of 11.8 L/min discharged from the large-diameter nozzle 53 a into thepipe 60 merges with cooling water with an amount of 110 L/min flowing outside thedifferential pressure injector 36 to become water with a total amount of 121.8 L/min at a flow velocity of 0.522 m/sec, and then is fed to thewater sprinkling tank 5 a in an upper portion of the cooling tower 5 (refer toFIG. 1 ). - (3) Effect of Example
- The cooling-
water circulation system 1 of the present example is configured such that the cooling-tower-side circulation path 2 and the chiller-machine-side circulation path 3 are connected by thefirst connection pipe 31 for introducing cooling water circulating through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2. This causes the cooling water circulating through the chiller-machine-side circulation path 3 to be introduced into the cooling-tower-side circulation path 2 via thefirst connection pipe 31. Then, manufacturers usually manage maintenance by administering preservatives, disinfectants, and the like to mainly the cooling-tower-side circulation path 2, so that the cooling water introduced into the cooling-tower-side circulation path 2 is improved in water quality. Unlike the conventional cooling-water circulation system, drainage equipment such as a drain tank does not need to be installed near thechiller machine 6, so that a simple structure can be obtained. - The present example is configured such that the
first connection pipe 31 is provided at its one end with thedifferential pressure injector 36, and such that thedifferential pressure injector 36 is able to introduce cooling water flowing through thefirst connection pipe 31 to the cooling water flowing through thepipe 60, under a lower pressure than the cooling water flowing through thepipe 60. As a result, even when cooling water flowing through the chiller-machine-side circulation path 3 is under pressure lower than cooling water flowing through the cooling-tower-side circulation path 2, the differential pressure injector introduces the cooling water flowing through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2. - The present example is configured such that the
differential pressure injector 36 includes the small-diameter nozzle 52, the large-diameter nozzle 53, and theintake port 54. As a result, taking cooling water flowing through thepipe 60 into the large-diameter nozzle 53 from theintake port 54 causes negative pressure to be generated in front of thedischarge port 52 a of the small-diameter nozzle 52. The negative pressure causes suction force to draw out cooling water from thedischarge port 52 a of the small-diameter nozzle 52 at a higher flow velocity (e.g., a flow velocity about four times a flow velocity of cooling water flowing through the first connection pipe 31) than the cooling water flowing through thefirst connection pipe 31. Then, cooling water taken in through theintake port 54 is combined with cooling water drawn out from thedischarge port 52 a of the small-diameter nozzle 52 to be injected into thepipe 60 through thedischarge port 53 a of the large-diameter nozzle 63. Thus, thedifferential pressure injector 36 with a simple structure introduces cooling water flowing through the chiller-machine-side circulation path 3 into the cooling-tower-side circulation path 2. - The present example is configured such that the large-
diameter nozzle 53 is disposed so as to cover the outer peripheral surface of the small-diameter nozzle 52, and such that theintake port 54 is formed in a portion of the large-diameter nozzle 53, covering the outer peripheral surface of the small-diameter nozzle 52. As a result, the cooling water is effectively taken into the large-diameter nozzle 53 from theintake port 54 to generate a larger negative pressure in front of the discharge port of the small-diameter nozzle 52. This further increases an injection force of thedifferential pressure injector 36. - The present example is configured such that a plurality of the
intake ports 54 is formed along the circumferential direction around the axis of the large-diameter nozzle 53, and such that each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle 53. As a result, the cooling water is more effectively taken into the large-diameter nozzle 53 from theintake port 54. This further increases an injection force of thedifferential pressure injector 36. - The present example is configured such that the chiller-machine-
side circulation path 3 is provided in itsfeed path 3 a with the waterimpurity separation device 17 that includes thedrain port 17 a, and such that thefirst connection pipe 31 connects thedrain port 17 a and thereturn path 2 b of the cooling-tower-side circulation path 2. As a result, the cooling water is introduced into thereturn path 2 b of the cooling-tower-side circulation path 2, together with impurities separated by the waterimpurity separation device 17, via thefirst connection pipe 31. - The present example is configured such that the
first connection pipe 31 is provided with theelectric valve 33 that opens and closes thefirst connection pipe 31 by opening and closing control of thecontrol unit 32. As a result, the cooling water flowing through the chiller-machine-side circulation path 3 can be automatically drained with the timer function and the like of thecontrol unit 32. - The present example is configured such that the
first connection pipe 31 is provided with theconstant flow valve 34 of a washer rubber type. This prevents clogging even when solid impurities pass through theconstant flow valve 34 at the time of draining cooling water. - The present example is configured such that the cooling-tower-
side circulation path 2 and the chiller-machine-side circulation path 3 are connected by thesecond connection pipe 38. This causes the cooling water circulating through the cooling-tower-side circulation path 2 to be introduced into the chiller-machine-side circulation path 3 via thesecond connection pipe 38. Accordingly, the cooling water contaminated in the chiller-machine-side circulation path 3 and the cooling water improved in water quality in the cooling-tower-side circulation path 2 can be easily exchanged with each other. As a result, corrosion (rust) of cooling pipes directly connected to a product, and hard scales including silica and the like adhering to the inside of pipes, are suppressed as compared with when cooling water is not exchanged. This prevents deterioration in cooling efficiency to lead to quality stability. - The present example is configured such that the
second connection pipe 38 connects thefeed path 2 a of the cooling-tower-side circulation path 2 and thetank 6 a provided in thechiller machine 6. This causes the cooling water circulating through the cooling-tower-side circulation path 2 to be introduced into thetank 6 a of thechiller machine 6 via thesecond connection pipe 38. - The present example is configured such that the
second connection pipe 38 is provided at its one end with thefloat valve 39. Accordingly, thefloat valve 39 automatically opens and closes the second connectingpipe 38 in accordance with vertical movement of a water surface in thetank 6 a. - The present invention is not limited to the example described above, and can be variously modified within the scope of the present invention depending on purpose and use. That is, while the above example shows an aspect in which the
first connection pipe 31 is provided at its one end with thedifferential pressure injector 36 disposed in thepipe 60, for example, the present invention is not limited thereto. When circulatory pressure in the chiller-machine-side circulation path 3 is equal to or more than circulatory pressure in the cooling-tower-side circulation path 2, thefirst connection pipe 31 may be directly connected at one end to an outer peripheral portion of thepipe 60 without providing thedifferential pressure injector 36 at the one end of thefirst connection pipe 31, as illustrated inFIG. 7 , for example. - While the above example shows the cooling-
water circulation system 1 in which the cooling water contaminated in the chiller-machine-side circulation path 3 and the cooling water improved in water quality in the cooling-tower-side circulation path 2 are exchanged with each other, the present invention is not limited thereto. The cooling-water circulation system may be configured such that while the cooling water contaminated in the chiller-machine-side circulation path 3 is introduced into the cooling-tower-side circulation path 2, cooling water prepared separately from the cooling water in the cooling-tower-side circulation path 2 is introduced into the chiller-machine-side circulation path 3, for example. - While the above example shows the
first connection pipe 31 that connects thedrain port 17 a of the waterimpurity separation device 17 and the cooling-tower-side circulation path 2, the present invention is not limited thereto. The first connection pipe may directly connect the chiller-machine-side circulation path 3 (thefeed path 3 a or thereturn path 3 b) and the cooling-tower-side circulation path 2 (thefeed path 2 a or thereturn path 2 b), for example. - While the above example shows the
second connection pipe 38 that connects the cooling-tower-side circulation path 2 and thetank 6 a of thechiller machine 6, the present invention is not limited thereto. The second connection pipe may directly connect the cooling-tower-side circulation path 2 (thefeed path 2 a or thereturn path 2 b) and chiller-tower-side circulation path 3 (thefeed path 3 a or thereturn path 3 b), for example. - It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to exemplary embodiments, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular structures, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims.
- The present invention is not limited to the above-described embodiments, and various variations and modifications may be possible without departing from the scope of the present invention.
- The present invention is widely used as a technique for draining cooling water circulating through a chiller-machine-side circulation path. In particular, it is suitably used as a technique for exchanging cooling water contaminated in the chiller-machine-side circulation path with the cooling water improved in 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
- 6 a tank
- 7 cooling target part
- 17 water impurity separation device
- 17 a 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-diameter nozzle
- 54 intake port
- 60 pipe
Claims (11)
1. 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,
wherein 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 through the chiller-machine-side circulation path into the cooling-tower-side circulation path.
2. The cooling-water circulation system according to claim 1 , wherein
the first connection pipe is provided at its one end with a differential pressure injector disposed in a pipe constituting the cooling-tower-side circulation path, and
the differential pressure injector is able to introduce cooling water flowing through the first connection pipe to cooling water flowing through the pipe, under a lower pressure than the cooling water flowing through the pipe.
3. The cooling-water circulation system according to claim 2 , wherein
the differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that is disposed such that its axis is along a flow direction of cooling water in the pipe, a large-diameter nozzle that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe, and an intake port for taking the cooling water flowing through the pipe into the large-diameter nozzle to generate negative pressure in front of the discharge port of the small-diameter nozzle.
4. The cooling-water circulation system according to claim 3 , wherein
the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle, and
the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle.
5. The cooling-water circulation system according to claim 4 , wherein
a plurality of the intake ports is formed along a circumferential direction around the axis of the large-diameter nozzle, and
each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle.
6. The cooling-water circulation system according to claim 1 , wherein
the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device for removing impurities contained in cooling water circulating the chiller-machine-side circulation path,
the water impurity separation device includes a drain port for draining the cooling water together with separated impurities, and
the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path.
7. The cooling-water circulation system according to claim 1 , wherein
the first connection pipe is provided with an electric valve that opens and closes the first connection pipe by opening and closing control of a control unit.
8. The cooling-water circulation system according to claim 1 , wherein
the first connection pipe is provided with a constant flow valve of a washer rubber type.
9. The cooling-water circulation system according to claim 1 , wherein
the cooling-tower-side circulation path and the chiller-machine-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-machine-side circulation path.
10. 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.
11. The cooling-water circulation system according to claim 10 , wherein
the second connection pipe is provided at its one end with a float valve for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-148949 | 2016-07-28 | ||
JP2016148949A JP6809021B2 (en) | 2016-07-28 | 2016-07-28 | Cooling water circulation system |
PCT/JP2017/026724 WO2018021255A1 (en) | 2016-07-28 | 2017-07-24 | Cooling-water circulation system |
Publications (1)
Publication Number | Publication Date |
---|---|
US20190301819A1 true US20190301819A1 (en) | 2019-10-03 |
Family
ID=61017578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/317,426 Abandoned US20190301819A1 (en) | 2016-07-28 | 2017-07-24 | Cooling-water circulation system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20190301819A1 (en) |
JP (1) | JP6809021B2 (en) |
CN (1) | CN109154483B (en) |
WO (1) | WO2018021255A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20210262705A1 (en) * | 2019-06-07 | 2021-08-26 | Carrier Corporation | Modular waterside economizer integrated with air-cooled chillers |
US11499756B2 (en) * | 2017-04-07 | 2022-11-15 | Carrier Corporation | Modular waterside economizer for air-cooled chillers |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109664480B (en) * | 2019-01-15 | 2021-04-20 | 宁夏神州轮胎有限公司 | Tire semi-finished product low-temperature cooling circulation system |
KR102059959B1 (en) * | 2019-09-09 | 2019-12-27 | 주식회사 한하산업 | Sludge drying apparatus with a circulating heat exchange structure |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03271675A (en) * | 1990-03-20 | 1991-12-03 | Kuken Kogyo Kk | Cold water manufacturing device |
WO2008009296A1 (en) * | 2006-07-16 | 2008-01-24 | Montaser Mohamed Zamzam | Free cooling scheme for process cooling and air conditioning applications |
JP5666790B2 (en) * | 2009-07-27 | 2015-02-12 | ホーチキ株式会社 | Flowing water detection device |
JP5604129B2 (en) * | 2010-02-09 | 2014-10-08 | アクアス株式会社 | Cooling tower chemical injection device |
JP5777111B2 (en) * | 2012-11-28 | 2015-09-09 | 有限会社アクアテック | Auxiliary cooling device for condenser |
JP6286691B2 (en) * | 2014-04-04 | 2018-03-07 | オリオン機械株式会社 | Coolant supply device |
CN105004198A (en) * | 2015-07-16 | 2015-10-28 | 西安石油大学 | Water type circulating water-air cooling system and method |
CN204918180U (en) * | 2015-07-31 | 2015-12-30 | 芜湖真空科技有限公司 | Recirculating cooling water system |
JP6753192B2 (en) * | 2016-07-28 | 2020-09-09 | トヨタ紡織株式会社 | Sediment removal device and cooling water circulation system equipped with it |
-
2016
- 2016-07-28 JP JP2016148949A patent/JP6809021B2/en active Active
-
2017
- 2017-07-24 CN CN201780031508.XA patent/CN109154483B/en not_active Expired - Fee Related
- 2017-07-24 WO PCT/JP2017/026724 patent/WO2018021255A1/en active Application Filing
- 2017-07-24 US US16/317,426 patent/US20190301819A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11499756B2 (en) * | 2017-04-07 | 2022-11-15 | Carrier Corporation | Modular waterside economizer for air-cooled chillers |
US20210262705A1 (en) * | 2019-06-07 | 2021-08-26 | Carrier Corporation | Modular waterside economizer integrated with air-cooled chillers |
US12066221B2 (en) * | 2019-06-07 | 2024-08-20 | Carrier Corporation | Modular waterside economizer integrated with air-cooled chillers |
Also Published As
Publication number | Publication date |
---|---|
CN109154483B (en) | 2020-04-21 |
WO2018021255A1 (en) | 2018-02-01 |
CN109154483A (en) | 2019-01-04 |
JP6809021B2 (en) | 2021-01-06 |
JP2018017471A (en) | 2018-02-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20190301819A1 (en) | Cooling-water circulation system | |
US20210291081A1 (en) | Precipitate removing apparatus and cooling water circulation system provided with same | |
US20200398231A1 (en) | Microbubble generator and cooling water circulation system equipped with same | |
CN205669068U (en) | A kind of circulation flushing formula tubing acid dip pickle | |
CN104894815B (en) | Filter and washing machine with circulating water filter system | |
CN201713404U (en) | Recirculated cooling water treatment device | |
CN212941671U (en) | Automatic pumping device of filter internal water for water conservancy micro-irrigation | |
CN212025084U (en) | Small-size integrated bypass flow type ECT electrochemical water treatment device | |
CN211516376U (en) | Cooling water treatment device for welding gun | |
CN209481387U (en) | A kind for the treatment of tank convenient for cleaning inner wall | |
CN216745708U (en) | Online cleaning device of chilled water system | |
CN109879461A (en) | A kind of water for irrigation processing system | |
KR101672517B1 (en) | Pre-processing device for removing contaminants of the heat exchanger using waste water heat source | |
CN101462016A (en) | Return sludge flow type metafiltration pool for precipitating sludge | |
CN205347052U (en) | Electroplate contaminated water filtration apparatus | |
CN211288278U (en) | Liquid-proof sealing device for water jet vacuum pump | |
JP3079233B2 (en) | Electrocoating equipment | |
CN216655590U (en) | Household electrical appliances cleaning equipment | |
CN214065842U (en) | Condenser belt cleaning device | |
CN213748086U (en) | Multifunctional pump station system for cleaning | |
CN211786796U (en) | Circulating water system of polypropylene SPG device | |
CN221322734U (en) | Water diversion device for pump | |
CN216469854U (en) | Anti-pollution discharging equipment of purified water storage tank, injection water storage tank | |
CN218454104U (en) | Waste water cooling circulation electrolytic device | |
CN215995705U (en) | Emulsion is handled and is used precipitation equipment with structure of being convenient for clear up |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TOYOTA BOSHOKU KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NAGATA, MASASUKE;REEL/FRAME:047976/0822 Effective date: 20190108 |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |