US2708546A - Centrifugal fan with wave trap and cut-off - Google Patents
Centrifugal fan with wave trap and cut-off Download PDFInfo
- Publication number
- US2708546A US2708546A US233751A US23375151A US2708546A US 2708546 A US2708546 A US 2708546A US 233751 A US233751 A US 233751A US 23375151 A US23375151 A US 23375151A US 2708546 A US2708546 A US 2708546A
- Authority
- US
- United States
- Prior art keywords
- cut
- cylinder
- fan
- centrifugal fan
- wave trap
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
Definitions
- the perfora- Fig. I is an end view of a fan assembly h i a peptions in cylinder 32 may be /3" diameter, in cylinder 34, forated and slotted cylindrical cut-off silencer according /32", and in Cylinder 36, /16" diameter- This triple Y to the invention, inder assembly is mounted within the fan housing outlet Fig.
- Fig III is an exploded perspective view of the cutside of the fan, shown in outline at 40 and may be sup- 01f cylinder and its ad ustable mounting means, and 70 ported therein upon axially spaced brackets one of which Fig. IV is a cross-section of a fan housing w th a al. is shown at 42, whereas the two inner cylinders 34 and ternative cut-off silencer in accordance with the inven- 6 y be eemplete cylinders, as Shown The Outer tion.
- cylinder 32 may be constituted by a perforated sheet said prior Patent No 2 335,734 but, referring first to Having thus described my invention what I claim as Figs I to III includes an improved cut-off silencer device new and desire to protect by Letters Patent is in the form of a cylinder 10 mounted in the fan dischar e
- a centrlfugal fan having a casing with a disperiphery of the fan blade assembly 16
- the rotary shaft to discharge pressure air through said nozzle
- a cut off disposed to face downstream with respect to the dissaid fan assembly
- Sald elongated member having all P- charge of the pressure air through the nozzle 12, as shown stream perforated surface presented to the pressure air in Fig. II.
- the down-stream sur- This cylindrical cut-off device possesses distinct adface of said member defining an enlarged opening extendvantages over the fixed gate structure of my prior patent.
- the cylinder 10 presents a blunt impact surface, her and transversely of the stream of pressure air. much like the leading edge of an aerofoil, and permits 2.
- the invention as defined in claim 1, means adjustthe impinged air stream to seek its best streamline charably mounting said cut-off cylinder in MM means permitting the cylinder to be adiusted radially 1,990,860 Ellsworth Feb. 12, 1935 with respect to the fan assembly and transversely with 2,015,210 Witzel Sept.
Description
May 17, 1955 w. J. CALDWELL CENTRIFUGAL FAN WITH WAVE TRAP AND CUT- OFF Filed June 27, 1951 INVENTOR BY almmm ATTORNEY atent flice Uni d t Patented May 17, 1955 acteristic. Second, and of considerable importance, is the fact that the compression waves resulting from the 2,703,546 against the perforated cylinder surface are not reflected .3 from this surface, as in the case of a solid surface, but
i fig g ggg TRAP follow the pattern of airflow against a conventional perforated acoustic ceiling, with these sound waves being William J. Caldwell, Independence, Mo. admitted through the cylinder perforations to pass into the cylinder. Here, the presence of the axial slot 20 Apphcanon June 1951 serial 23375l it) has significance. The existence of this slot breaks up 2 Claims. (Cl. 230-114) the presence of a continuous reflecting surface Within the This invention relates to centrifugal fans and in parl5 place.
ticular to centrifugal fans of the character disclosed in These pressure type centrifugal fans exhibit considerable my prior Patent No 2 335,734 issued November 30 1943. sensitivity to the position of the cut-off device if the best According to the centrifugal fan disclosed in my said air delivery performance is to be obtained To provide by the action of the fan blades. In connection ith periphery of the fan blade assembly in a radial direction such a fan assembly, designed to compress air to 3 inches, but also transversely With sp t the discharge 1102' for example, the passage of the fan blades past this cutl ofi' gate has been found to give rise to a buzzing noise Th adj ments are possible by providing oval holes due to the slapping of the air stream against the gate 22 n the pp Walls of the Casing 14, thlollgh which and the sudden arresting of the air flow by the impingeholes spindle-like extensions 24 at the cylinder ends merit of the velocity of air against the cut-off gate. This extend t the outside f the casing Walls an receive buzzing noise is a characteristic of pressure type fans IheFeOVeI', in turn, a Sealing disc 26, a Washer and of these waves being in excess of the velocity of the Cation Ofthe Cylinder 10,88 above Stated p y by loosennormal air flow through the fan assembly, ing the nuts 30 and shifting the cylinder within the It is an ob ect of the invention to provide an improved limits of the holes with r p to Which th discs centrifugal fan assembly in which the above stated dis- 26 Provide an effective Seal in the tightened cohdiiiml advantages of a fixed cut-off are avoided. 0f h nuts 30.
It is another object of the invention to provide a cen- In IV I have shown a modified Construction Of trifugal fan having an improved cut-off which is quiet in Cut-01f Silencer involving three Cylinders 36 operation. 40 ranged in nested radially spaced eccentric relationship,
These, and further objects and advantages of the as Shown, With each Cylinder Presenting a Perforated invention will appear clear from consideration of the face to the a flow m h an and th Siz of th following description with reference to the drawings in perforations varying desreasingly in size from the Outerwhich: most cylinder to the innermost one. Thus, the perfora- Fig. I is an end view of a fan assembly h i a peptions in cylinder 32 may be /3" diameter, in cylinder 34, forated and slotted cylindrical cut-off silencer according /32", and in Cylinder 36, /16" diameter- This triple Y to the invention, inder assembly is mounted within the fan housing outlet Fig. II is a section on the line II II of Fig. I, duct or nozzle 38 in close proximity to the discharge Fig III is an exploded perspective view of the cutside of the fan, shown in outline at 40 and may be sup- 01f cylinder and its ad ustable mounting means, and 70 ported therein upon axially spaced brackets one of which Fig. IV is a cross-section of a fan housing w th a al. is shown at 42, whereas the two inner cylinders 34 and ternative cut-off silencer in accordance with the inven- 6 y be eemplete cylinders, as Shown The Outer tion. cylinder 32 may be constituted by a perforated sheet said prior Patent No 2 335,734 but, referring first to Having thus described my invention what I claim as Figs I to III includes an improved cut-off silencer device new and desire to protect by Letters Patent is in the form of a cylinder 10 mounted in the fan dischar e In a centrlfugal fan having a casing with a disperiphery of the fan blade assembly 16, the rotary shaft to discharge pressure air through said nozzle, a cut off disposed to face downstream with respect to the dissaid fan assembly, Sald elongated member having all P- charge of the pressure air through the nozzle 12, as shown stream perforated surface presented to the pressure air in Fig. II. discharged from said fan assembly, the down-stream sur- This cylindrical cut-off device possesses distinct adface of said member defining an enlarged opening extendvantages over the fixed gate structure of my prior patent. ing longitudinally along the axis of said elongated mem- First, the cylinder 10 presents a blunt impact surface, her and transversely of the stream of pressure air. much like the leading edge of an aerofoil, and permits 2. The invention as defined in claim 1, means adjustthe impinged air stream to seek its best streamline charably mounting said cut-off cylinder in MM means permitting the cylinder to be adiusted radially 1,990,860 Ellsworth Feb. 12, 1935 with respect to the fan assembly and transversely with 2,015,210 Witzel Sept. 24, 1935 respect to said discharge nozzle. 2,107,897 McMahan Feb. 8, 1938 2,160,666 McMahan May 30, 1939 References Cited in the file of this patent 5 1,171,341 M h Aug 29 1939 UNITED STATES A T 2,214,467 Lambert Sept. 10, 1940 2 225 398 Hamblin Dec. 17 1940 1,043,966 Oldberg Nov. 12, 1912 1,840,082 Breer an 5, 1932 2,335,734 Caldwell 1943
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US233751A US2708546A (en) | 1951-06-27 | 1951-06-27 | Centrifugal fan with wave trap and cut-off |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US233751A US2708546A (en) | 1951-06-27 | 1951-06-27 | Centrifugal fan with wave trap and cut-off |
Publications (1)
Publication Number | Publication Date |
---|---|
US2708546A true US2708546A (en) | 1955-05-17 |
Family
ID=22878546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US233751A Expired - Lifetime US2708546A (en) | 1951-06-27 | 1951-06-27 | Centrifugal fan with wave trap and cut-off |
Country Status (1)
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US (1) | US2708546A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5340275A (en) * | 1993-08-02 | 1994-08-23 | Foster Wheeler Energy Corporation | Rotary throat cutoff device and method for reducing centrifugal fan noise |
FR2780454A1 (en) * | 1998-06-29 | 1999-12-31 | Valeo Climatisation | Noise absorption device for a centrifuge motor-fan unit in an automobile air conditioning system |
FR2856441A1 (en) * | 2003-06-19 | 2004-12-24 | Renault Sa | Centrifugal ventilating device for motor vehicle, has accelerating unit to accelerate air flow along active portion of inner surface of wall of enclosure, where unit is adjacent to opening of air outlet |
US20070187076A1 (en) * | 2006-02-16 | 2007-08-16 | American Standard International Inc | Sound attenuating shield for an electric heater |
CN101975197A (en) * | 2010-07-28 | 2011-02-16 | 苏州顶裕节能设备有限公司 | Fan noise reduction device |
CN105422488A (en) * | 2015-12-28 | 2016-03-23 | 烟台三立彩钢结构有限公司 | Ultra-silence high pressure air suction device |
CN114962335A (en) * | 2021-11-30 | 2022-08-30 | Tcl空调器(中山)有限公司 | Volute structure, air duct component and air conditioner |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1043966A (en) * | 1912-05-10 | 1912-11-12 | Oldberg Mfg Company | Muffler. |
US1840082A (en) * | 1927-05-28 | 1932-01-05 | Chrysler Corp | Muffler |
US1990860A (en) * | 1933-06-30 | 1935-02-12 | Edward D Schive | Stock roll |
US2015210A (en) * | 1934-10-13 | 1935-09-24 | Young Radiator Co | Centrifugal fan |
US2107897A (en) * | 1935-07-24 | 1938-02-08 | Gen Electric | Fan |
US2160666A (en) * | 1936-06-01 | 1939-05-30 | Gen Electric | Fan |
US2171341A (en) * | 1936-06-01 | 1939-08-29 | Gen Electric | Fan casing |
US2214467A (en) * | 1936-12-31 | 1940-09-10 | American Radiator & Standard | Air conditioning apparatus |
US2225398A (en) * | 1939-09-13 | 1940-12-17 | Clyde M Hamblin | Construction of ventilating fans |
US2335734A (en) * | 1942-03-10 | 1943-11-30 | William J Caldwell | Centrifugal fan |
-
1951
- 1951-06-27 US US233751A patent/US2708546A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1043966A (en) * | 1912-05-10 | 1912-11-12 | Oldberg Mfg Company | Muffler. |
US1840082A (en) * | 1927-05-28 | 1932-01-05 | Chrysler Corp | Muffler |
US1990860A (en) * | 1933-06-30 | 1935-02-12 | Edward D Schive | Stock roll |
US2015210A (en) * | 1934-10-13 | 1935-09-24 | Young Radiator Co | Centrifugal fan |
US2107897A (en) * | 1935-07-24 | 1938-02-08 | Gen Electric | Fan |
US2160666A (en) * | 1936-06-01 | 1939-05-30 | Gen Electric | Fan |
US2171341A (en) * | 1936-06-01 | 1939-08-29 | Gen Electric | Fan casing |
US2214467A (en) * | 1936-12-31 | 1940-09-10 | American Radiator & Standard | Air conditioning apparatus |
US2225398A (en) * | 1939-09-13 | 1940-12-17 | Clyde M Hamblin | Construction of ventilating fans |
US2335734A (en) * | 1942-03-10 | 1943-11-30 | William J Caldwell | Centrifugal fan |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5340275A (en) * | 1993-08-02 | 1994-08-23 | Foster Wheeler Energy Corporation | Rotary throat cutoff device and method for reducing centrifugal fan noise |
EP0638728A1 (en) * | 1993-08-02 | 1995-02-15 | Foster Wheeler Energy Corporation | Rotary throat cutoff device and method for reducing centrifugal fan noise |
CN1071424C (en) * | 1993-08-02 | 2001-09-19 | 福斯特·惠勒能源公司 | Rotary throat cutoff device and method for reducing centrifugal fan noise |
FR2780454A1 (en) * | 1998-06-29 | 1999-12-31 | Valeo Climatisation | Noise absorption device for a centrifuge motor-fan unit in an automobile air conditioning system |
FR2856441A1 (en) * | 2003-06-19 | 2004-12-24 | Renault Sa | Centrifugal ventilating device for motor vehicle, has accelerating unit to accelerate air flow along active portion of inner surface of wall of enclosure, where unit is adjacent to opening of air outlet |
US20070187076A1 (en) * | 2006-02-16 | 2007-08-16 | American Standard International Inc | Sound attenuating shield for an electric heater |
US7802615B2 (en) | 2006-02-16 | 2010-09-28 | Trane International Inc. | Sound attenuating shield for an electric heater |
CN101975197A (en) * | 2010-07-28 | 2011-02-16 | 苏州顶裕节能设备有限公司 | Fan noise reduction device |
CN105422488A (en) * | 2015-12-28 | 2016-03-23 | 烟台三立彩钢结构有限公司 | Ultra-silence high pressure air suction device |
CN114962335A (en) * | 2021-11-30 | 2022-08-30 | Tcl空调器(中山)有限公司 | Volute structure, air duct component and air conditioner |
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