EP0654649B1 - Spray nozzle for a cooling tower - Google Patents
Spray nozzle for a cooling tower Download PDFInfo
- Publication number
- EP0654649B1 EP0654649B1 EP94107262A EP94107262A EP0654649B1 EP 0654649 B1 EP0654649 B1 EP 0654649B1 EP 94107262 A EP94107262 A EP 94107262A EP 94107262 A EP94107262 A EP 94107262A EP 0654649 B1 EP0654649 B1 EP 0654649B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- fins
- nozzle
- cooling tower
- spray nozzle
- 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.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims description 19
- 239000007921 spray Substances 0.000 title claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000000463 material Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
- B05B3/0486—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet the spray jet being generated by a rotary deflector rotated by liquid discharged onto it in a direction substantially parallel its rotation axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
- F28F25/06—Spray nozzles or spray pipes
Definitions
- the invention relates to a spray nozzle for a cooling tower comprising the features of the preamble of claim 1.
- a spray nozzle for a cooling tower comprising the features of the preamble of claim 1.
- Such as spray nozzle allows an unform distribution of the water coming out from the nozzle outlet on the inner section of the tower and in particular on the upper surface of the heat exchange element normally contained in a cooling tower in order to increase the water/air contact surface and then the cooling efficiency.
- a cooling tower is a particular cooling plant used in numerous fields of technics and industry (thermoelectric, petrochemical etc.) to dissipate the heat present in the cooling water.
- the water to be cooled is sprayed on the tower top and during its falling it meets an air stream to which it transfers a heat quantity by partially vaporizing.
- Said air stream may be generated by one or more sucking fans placed on the tower top and/or by one or more blowing fans placed on the cooling tower bottom, or this air stream could be generated by the natural draught due to air density differences.
- the tower casing is at least partially filled with one or more layers of a "honeycomb" material (or of another equivalent material) which foresees an upper chamber where a plurality of spray nozzles are placed and a lower chamber where a sink for collecting the cooled water is placed.
- Coooling towers provided with spray nozzles having means suitable for more uniformly distribute water which has to be cooled on the whole inner section of the tower are known in the art.
- said distributing means comprises at least a disk-shaped mobile element, showing a plurality of fins on both sides, which is rotated by the water to be cooled coming out from the nozzle and urging the fins present on one side; in this case the centrifugal force spreads out said water on a larger surface.
- Said known distributing elements are quite expensive and complicated since for instance the mobile element is kept by means of a fixed element receiving a part of the water to be cooled through a hole placed in the center of the mobile element. In this case, a part of the water urging the fixed element is further dispersed and the balance is deviated towards the fins present on the other side of the mobile element; these fins spread out the coming water by means of the centrifugal force.
- the fixed element is kept in its housing by a tension rod passing through the hole present in the mobile element and it is fixed to a stand present in the inner side of the spray nozzle.
- Said stand and the relative fixing means to the nozzle must be strong enough to bear the action of the water which has to be cooled coming out from the nozzle and they reduce the nozzle free section and the hole section present on the mobile element.
- the water to be cooled coming from the nozzle passes through the hole present on the mobile element and urges a slightly curved plate (which constitutes the fixed element) which deviates it towards the fins present on the correspondent side of the mobile element, said fins rotating the mobile element which spreads out the water to be cooled by centrifugal force.
- US-A-2 785 013 shows a substantially conically shaped rotor for spray head with the vertex directed towards the outlet section of the nozzle and provided on its surface with one or two fins, which are urged by the water going from the outlet section to rotate said rotor around a pin fixed to the external wall of the nozzle.
- the water to be cooled can not properly wet the part of the heat exchange element immediately underlying each nozzle; in this case, around a third of the surface affected by each spray nozzle is wet by the water to be cooled in an inadequate manner.
- the mobile element of the known distributing elements can be stopped by foreign bodies and/or by scales of the mineral salt normally present in the water for industrial purposes used as cooling water in the plant comprising the cooling tower, said foreign bodies and/or scale being removable only by cutting off the cooling tower and disassambling the distributing elements.
- An object of the present invention is a spray nozzle, suitable for a cooling tower, including a rotor which allows to overcome the foresaid drawbacks shown by the known distributing means.
- Object of the present invention is a spray nozzle for cooling tower including a rotor, which is substantially conically shaped with the vertex directed towards the outlet section of the spray nozzle and which provides on its surface fins urged by the water going out from said outlet section, the action of the water on said fins rotating the rotor around a pin fixed to the external wall of the nozzle.
- Such a rotor is known, for example, from US-A-2 785 013.
- said spray nozzle is characterised in that:
- Figure 1 shows a top view of the rotor according to the present invention
- Figure 2 shows a cross-section along a plane A-A of the above rotor.
- the hub 1 showing a through hole 2 receiving a pin 9 ( Figures 3 and 4) which constitutes the rotor rotation axis and eight fins 3, equidistant each other, shaped as arcs of circumference till the rotor edge.
- the fins 3 have constant height and thickness and are connected to the rotor hub 1, which therefore is shaped as a cone gradually transformed into a multiplicity of identical curvilinear arms.
- the eight cavities may be grouped in two groups of four cavities 5, 6, 7, 8 of different depth, uniformly disposed on the rotor; in this case, two identical cavities appear perfectly symmetric as regards the rotor hub 1.
- the water flowing through the deeper cavities 8 goes out the rotor action creating the central part of the distributing cone which wets the part underlying the nozzle, preventing the serious drawback of the known distributing devices.
- a rotor according to the present invention works correctly even if no cavity is provided in some of the parts in which it is divided by the fins 3 whereas it is necessary (or at least suitable) that at least a fin is present between two contiguous cavities: it is therefore necessary (or at least suitable) that the number of cavity realized in the rotor main body 4 is equal or at least not higher than the number of the fins 3.
- a rotor according to the invention has also the advantage to be self-cleaning, since the action of the water jet, the absence of mobile parts around the rotor and the fact that the fins 3 are gradually linked to the hub 1 assure that a foreign body present in the water to be cooled does not stop on the rotor and that the rotor itself can not be stopped by scales of mineral salts normally present in the cooling water.
- Figure 3 shows a lateral view of the rotor, where the rotation hub 9 is constituted by the terminal portion of a stand 10 (or it is fixed in any manner to said stand 10) which is cantileverly fixed to the external wall of the nozzle 11 and which supports the rotor from the top.
- a protection cap 12 is provided above the rotor; furthermore, on the hub 9 washers 13, 14 are provided, these last ones being in a material having suitable frictional resistence and preferably of self-lubricating kind.
- the stand 10, fixed out from the nozzle 11, does not need fixing means particularly strong, does not reduce the outlet section of the nozzle 11 and does not interfere with the free water flowing from the nozzle itself.
- the Figure 4 shows a lateral sectional view of the rotor whose rotation hub 9 is supported by a stand 15 bearing the rotor from the bottom; the main body 4 of the rotor protects the seat of rotor receiving the hub 9 against foreign bodies and/or scale.
- washers 13, 14 On the contact surface between the stand 15 and the rotor it is suitable to use washers 13, 14 in a material having a suitable frictional resistence and being preferably self-lubrificant.
- the cap 16 makes easier the water flowing along the main body 4 of the rotor; in this case, the stand is less stressed.
- the rotor formerly described only as non-limiting example includes eight fins and two series of four cavities, however, a skilled person may modify said rotor by realizing a different number of fins 3 and/or series of cavities and/or cavities for each series (anyway the number of the cavities must be equal or at least not higher than the fins number) and by including any further modification and improvement suggested by the normal experience and by the natural progress of the technics.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
- at least three fins are present on said surface, of said rotor and
- in that in the main body of the rotor there are, starting from the external edge, at least a series of cavities of different depth, equidistant from each other and with a profile similar to that of the fins,
- each of said cavities being realised in a part of the said main body of said rotor comprised between two adjacent fins.
- Figure 1 shows a top view of a rotor according to the present invention;
- Figure 2 shows a cross-section along plane A-A of Figure 1 of the 20 above rotor;
- Figure 3 shows a lateral view of the rotor shown in Figure 2 mounted on a stand projecting from the nozzle supporting it from the top;
- Figure 4 shows a lateral view of the rotor shown in Figure 2 mounted on a stand able to support it from the bottom.
Claims (6)
- Spray nozzle for cooling tower including a rotor, said rotor being substantially conically shaped with the vertex directed towards the outlet section of said nozzle (11) and providing on its surface fins (3) urged by the water going out from said outlet section, the action of said water on said fins (3) rotating said rotor around a pin (9) fixed to the external wall of said nozzle (11),
characterized in that at least three fins (3) are present on said surface of said rotor and in that in the main body (4) of said rotor there are, starting from the external edge, at least a series of cavities (5-8) of different depth, equidistant from each other and with a profile similar to that of said fins (3), each of said cavities (5-8) being realized in a part of said main body (4) of said rotor comprised between two adjacent fins (3). - Spray nozzle for cooling tower according to claim 1, characterized in that said fins (3) of said rotor having constant section and constant height are arc-shaped.
- Spray nozzle for cooling tower according to claim 1, characterized in that its rotor comprises eight fins (3) and two series of cavities, each of them comprising four cavities (5, 6, 7, 8) of different depth.
- Spray nozzle for cooling tower according to claim 1, characterized in that its rotor is supported from the top by said rotation pin (9) fixed to a stand (10) cantileverly fixed to the external wall of said nozzle (11).
- Spray nozzle for cooling tower according to claim 1, characterized in that its rotor is supported from the bottom by said rotation pin (9) carried by supporting means (15) fixed to the external wall of said nozzle (11).
- Spray nozzle for cooling tower according to claim 1, characterized in that, on its rotor, the number of said cavities is not higher than the number of said fins (3).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI932472 | 1993-11-23 | ||
IT93MI002472A IT1265344B1 (en) | 1993-11-23 | 1993-11-23 | SPRAYER NOZZLE IMPELLER FOR EVAPORATION TOWER |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0654649A2 EP0654649A2 (en) | 1995-05-24 |
EP0654649A3 EP0654649A3 (en) | 1995-10-25 |
EP0654649B1 true EP0654649B1 (en) | 1998-12-23 |
Family
ID=11367242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94107262A Expired - Lifetime EP0654649B1 (en) | 1993-11-23 | 1994-05-10 | Spray nozzle for a cooling tower |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0654649B1 (en) |
DE (1) | DE69415482T2 (en) |
ES (1) | ES2129538T3 (en) |
IT (1) | IT1265344B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW392835U (en) * | 1999-10-08 | 2000-06-01 | Paochang Electric Mfg Corp | High efficiency cooling device of cooling mechanism |
CN105180710B (en) * | 2015-10-15 | 2017-01-25 | 河海大学常州校区 | Dual-rotation type splashing device driven through water flow |
CN110455114B (en) * | 2019-08-09 | 2024-03-22 | 大连斯频德环境设备有限公司 | Centrifugal rotational flow hollow rotatable nozzle device |
CN110801993B (en) * | 2019-11-19 | 2020-10-16 | 苏州知瑞光电材料科技有限公司 | Gluing system and gluing method for stamping metal plate |
CN112964119B (en) * | 2021-04-28 | 2022-06-07 | 湖州中赢节能科技有限公司 | Multi-stage circulating jet spraying device for packless cooling tower |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL103160C (en) * | 1900-01-01 | |||
DE381445C (en) * | 1922-06-10 | 1923-09-20 | Ludwig Prawda | Splash plate for trickle cooling, with grooves running on the surface to distribute the water |
US2785013A (en) * | 1954-09-15 | 1957-03-12 | Dick E Stearns | Spray head |
CH350499A (en) * | 1957-04-09 | 1960-11-30 | Leuenberger Christian | Device for sprinkling plants, in particular trees |
US4111366A (en) * | 1976-03-04 | 1978-09-05 | Dee-Mac Construction Co., Inc. | Spinner nozzle for use in cooling tower |
-
1993
- 1993-11-23 IT IT93MI002472A patent/IT1265344B1/en active IP Right Grant
-
1994
- 1994-05-10 ES ES94107262T patent/ES2129538T3/en not_active Expired - Lifetime
- 1994-05-10 EP EP94107262A patent/EP0654649B1/en not_active Expired - Lifetime
- 1994-05-10 DE DE69415482T patent/DE69415482T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69415482T2 (en) | 1999-06-02 |
ITMI932472A1 (en) | 1995-05-23 |
IT1265344B1 (en) | 1996-11-22 |
ES2129538T3 (en) | 1999-06-16 |
EP0654649A2 (en) | 1995-05-24 |
EP0654649A3 (en) | 1995-10-25 |
DE69415482D1 (en) | 1999-02-04 |
ITMI932472A0 (en) | 1993-11-23 |
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