GB1572611A - Cross-ventilated centrifugal fan arrangement - Google Patents

Cross-ventilated centrifugal fan arrangement Download PDF

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Publication number
GB1572611A
GB1572611A GB3496276A GB3496276A GB1572611A GB 1572611 A GB1572611 A GB 1572611A GB 3496276 A GB3496276 A GB 3496276A GB 3496276 A GB3496276 A GB 3496276A GB 1572611 A GB1572611 A GB 1572611A
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United Kingdom
Prior art keywords
casing
inlet
impeller
strut
cross
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
Application number
GB3496276A
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Robertson Co H H
Original Assignee
Robertson Co H H
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robertson Co H H filed Critical Robertson Co H H
Priority to GB3496276A priority Critical patent/GB1572611A/en
Publication of GB1572611A publication Critical patent/GB1572611A/en
Expired legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/08Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226Fan casings
    • F04D29/4253Fan casings with axial entry and discharge

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

(54) CROSS-VENTILATED CENTRIFUGAL FAN ARRANGEMENT (71) We, H. H. ROBERTSON COMPANY.
a Corporation organised and existing under the laws of the State of Pennsylvania, United States of America, of Two Gateway Center, Pittsburgh, Pennsylvania 15222, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement: This invention is concerned with so called cross ventilated fans, fans of this type being used where it is required to deal with a contaminated or high temperature gaseous medium, and wherein the circumstances are such that it is not convenient to drive the fan from a motor situated externally of the fan casing, e.g. in coal mines and similar situations wherein an in-line fan arrangement is preferred.
The present invention has for its object to provide an improved, in-line, cross ventilated fan arrangement embodying a centrifugal impeller, which will be compact, capable of a high pressure development which is at least comparable with similar in-line radial flow fan arrangements, and which will provide complete motor accessibility for maintenance or replacement.
Broadly, according to the invention, a cross ventilated, in-line, centrifugal fan arrangement comprises a casing defining a flow path for a gaseous stream, said casing having an inlet and an outlet on the longitudinal axis of said casing whereby it may be interposed in trunking, a centrifugal impeller, which may be of mixed flow type, rotatable at said inlet on an axis coincident with said longitudinal axis, an inlet cone for directing inflow to the said impeller, a hollow, stream-lined, strut extending across said casing with an electric motor mounted in said strut for directly driving said impeller, the medial part of said casing being rectangular in cross-section said medial part merging smoothly into said inlet and outlet portions at least one of which is circular and the trailing edge of said hollow stream-lined strut extending substantially up to the outlet of said casing.The clearance area above and below said strut at its maximum depth generally is at least equal to the cross-sectional area of the impeller inlet.
In one embodiment the inlet is circular and the outlet square or rectangular, this construction being particularly useful for interposing in a trunking situation wherein there is a transition from circular crosssection to square or rectangular crosssection. In an alternative embodiment both the inlet and outlet of said casing are circular.
The electric motor within the strut may be base mounted or front mounted as found convenient.
The invention is further described with the aid of the drawings, Figures 1-5, accompanying the Provisional Specification, and the accompanying Figure 6, which illustrate, by way of example only, embodiments of the invention. In the various figures of the drawings like characters of reference have been used to denote like or equivalent parts wherever they occur.
In said drawings: Figure 1 is a sectional elevation of a cross ventilated, in-line, centrifugal fan arrangement according to the invention, and Figure 2 is an end elevation as viewed from the right-hand side of Figure 1.
Figure 3 is a view similar to Figure 1 but depicting an alternative method of mounting the electric motor.
Figure 4 is a sectional elevation of an alternative casing construction, and Figure 5 is an end elevation as viewed from the left-hand side of Figure 4.
Figure 6 is a fragmentary view in section showing an alternative form of impeller.
Referring to said drawings, and first to Figures 1 and 2, the numeral 10 generally denotes a casing defining a flow path for a gaseous stream, e.g. an air stream, said casing having an inlet 11 and an outlet 12 aligned on the longitudinal axis X-X of said casing. Said inlet and outlet are in this instance each circular in cross-section, said inlet having an inboard stiffening flange 13 and an outer flange 14 whereto is secured a flanged cylindrical inlet spigot 15.
The medial part 20 of the casing 10 is of a generally rectangular cross-section and merges smoothly into the circular inlet and outlet parts 11, 12 by means of conical and chamfered transfer sections 21, 22.
To facilitate manufacture the edge of the part 20 may be radiused as at 23 (Figure 2). Rotatable with clearance inboard of the inlet 11 is a centrifugal impeller 30, said impeller comprising a hub 31 having bolted thereto a back plate 32, radially directed impeller blades 33 mounted on said back plate 32 and extending forwardly therefrom, and a ring 34 connecting the forward extremities of said blades. The axis of said impeller 30 is coincident with the longitudinal centre-line X-X of the casing 10.
Mounted concentrically within the inlet 11 is an inlet cone 16 for directing inflow of air to the impeller 30, said cone 16 having its forward peripheral flange 17 fixedly located between the flange 14 of said inlet 11 and the inboard flange of the inlet spigot 15. The inner rim 18 of said inlet cone may be located, being a clearance running fit, within the outer ring 34 of the impeller 30 as shown, or, alternatively the rim 18 may be in axial alignment with the ring 34.
The hub 31 of the impeller comprises a cylindrical part 31a having a through bore whereby it can be slid onto and be keyed to the drive shaft 41 of an electric motor 40 with cable inlet 40a mounted within a hollow stream-lined strut 50 extending across the medial casing part 20. The trailing edge 51 of the strut 50 in this instance extends substantially up to the exit 12 of the casing 10. The flow area between the strut 50 at its maximum depth and the opposed walls of the rectangular part 20 preferably is at least substantially equal to the cross-sectional area of the impeller inlet.
The motor 40 is, in this instance, mounted on a horizontal foot-plate 52 fixedly secured within the strut 50, and the drive shaft 41 with the hub part 31a extends through the leading edge of the strut via a suitable seal 42. The hub part 31a is located on the drive shaft 41 by means of a bolt 43 and an end plate 44, the bolt 43 being engaged in a screw-threaded axial passage of said drive shaft 41.
The sides of the medial casing part 20 are provided with access doors 46 and 47 and lifting lugs 45.
In circumstances where high temperature gases are to be handled, the walls of the strut 50 may be thermally insulated and baffles may be arranged in the strut to enhance the effectiveness of cooling air directed over the motor 40. In cases of extreme temperature, auxiliary fan means may be provided for cooling the motor 40.
Referring to Figure 3, this illustrates a centrifugal fan arrangement which differs from that of Figures 1 and 2 only in that the motor 40 is front mounted on a plate 62 bolted as at 63 to a modified circular forepart 64 of the hollow stream-lined strut 50.
Figures 4 and 5 depict a fan casing which is useful in trunking situations where there is required a transition from circular section to rectangular section. In this instance the inlet 11 is circular having a form substantially as described with reference to Figures 1 and 2. The main casing part 20' has divergent planar side walls 65, 66, 67 and 68 which terminate at a rectangular flanged outlet 12'. The motor 40 is footmounted on a horizontal plate 52 and the hollow strut 50' is shortened so as to terminate at the exit 12'.
Figure 6 is a fragmentary sectional view showing the inlet end of a casing 10, similar to that of Figure 1, but which incorporates a centrifugal impeller of mixed flow type comprising a frustro-conical backplate 32a and shroud 34a, with rearwardly sloping blades 33a. As before an inlet cone 16 is provided. In this type of impeller the gase-ous stream has an axial component of movement in addition to the radial component.
Cross ventilated, in-line, centrifugal fan arrangements according to the invention are capable of high pressure development, and the increased clearance which can be provided between the casing and the impeller, as compared with the clearance between an axial flow impeller and the casing, is of great advantage when operating in hazardous environments where damage to the fan casing is a possibility.
WHAT WE CLAIM IS: - 1. A cross-ventilated, in-line, centrifugal fan arrangement comprising a casing defining a flow path for a gaseous stream, said casing having an inlet and an outlet on the longitudinal axis of said casing whereby it may be interposed in trunking, a centrifugal impeller rotatable at said inlet on an axis coincident with said longitudinal axis, an inlet cone for directing in-flow to the said impeller, a hollow stream-lined strut extending across said casing with an electric motor mounted in said strut for directly
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. showing an alternative form of impeller. Referring to said drawings, and first to Figures 1 and 2, the numeral 10 generally denotes a casing defining a flow path for a gaseous stream, e.g. an air stream, said casing having an inlet 11 and an outlet 12 aligned on the longitudinal axis X-X of said casing. Said inlet and outlet are in this instance each circular in cross-section, said inlet having an inboard stiffening flange 13 and an outer flange 14 whereto is secured a flanged cylindrical inlet spigot 15. The medial part 20 of the casing 10 is of a generally rectangular cross-section and merges smoothly into the circular inlet and outlet parts 11, 12 by means of conical and chamfered transfer sections 21, 22. To facilitate manufacture the edge of the part 20 may be radiused as at 23 (Figure 2). Rotatable with clearance inboard of the inlet 11 is a centrifugal impeller 30, said impeller comprising a hub 31 having bolted thereto a back plate 32, radially directed impeller blades 33 mounted on said back plate 32 and extending forwardly therefrom, and a ring 34 connecting the forward extremities of said blades. The axis of said impeller 30 is coincident with the longitudinal centre-line X-X of the casing 10. Mounted concentrically within the inlet 11 is an inlet cone 16 for directing inflow of air to the impeller 30, said cone 16 having its forward peripheral flange 17 fixedly located between the flange 14 of said inlet 11 and the inboard flange of the inlet spigot 15. The inner rim 18 of said inlet cone may be located, being a clearance running fit, within the outer ring 34 of the impeller 30 as shown, or, alternatively the rim 18 may be in axial alignment with the ring 34. The hub 31 of the impeller comprises a cylindrical part 31a having a through bore whereby it can be slid onto and be keyed to the drive shaft 41 of an electric motor 40 with cable inlet 40a mounted within a hollow stream-lined strut 50 extending across the medial casing part 20. The trailing edge 51 of the strut 50 in this instance extends substantially up to the exit 12 of the casing 10. The flow area between the strut 50 at its maximum depth and the opposed walls of the rectangular part 20 preferably is at least substantially equal to the cross-sectional area of the impeller inlet. The motor 40 is, in this instance, mounted on a horizontal foot-plate 52 fixedly secured within the strut 50, and the drive shaft 41 with the hub part 31a extends through the leading edge of the strut via a suitable seal 42. The hub part 31a is located on the drive shaft 41 by means of a bolt 43 and an end plate 44, the bolt 43 being engaged in a screw-threaded axial passage of said drive shaft 41. The sides of the medial casing part 20 are provided with access doors 46 and 47 and lifting lugs 45. In circumstances where high temperature gases are to be handled, the walls of the strut 50 may be thermally insulated and baffles may be arranged in the strut to enhance the effectiveness of cooling air directed over the motor 40. In cases of extreme temperature, auxiliary fan means may be provided for cooling the motor 40. Referring to Figure 3, this illustrates a centrifugal fan arrangement which differs from that of Figures 1 and 2 only in that the motor 40 is front mounted on a plate 62 bolted as at 63 to a modified circular forepart 64 of the hollow stream-lined strut 50. Figures 4 and 5 depict a fan casing which is useful in trunking situations where there is required a transition from circular section to rectangular section. In this instance the inlet 11 is circular having a form substantially as described with reference to Figures 1 and 2. The main casing part 20' has divergent planar side walls 65, 66, 67 and 68 which terminate at a rectangular flanged outlet 12'. The motor 40 is footmounted on a horizontal plate 52 and the hollow strut 50' is shortened so as to terminate at the exit 12'. Figure 6 is a fragmentary sectional view showing the inlet end of a casing 10, similar to that of Figure 1, but which incorporates a centrifugal impeller of mixed flow type comprising a frustro-conical backplate 32a and shroud 34a, with rearwardly sloping blades 33a. As before an inlet cone 16 is provided. In this type of impeller the gase-ous stream has an axial component of movement in addition to the radial component. Cross ventilated, in-line, centrifugal fan arrangements according to the invention are capable of high pressure development, and the increased clearance which can be provided between the casing and the impeller, as compared with the clearance between an axial flow impeller and the casing, is of great advantage when operating in hazardous environments where damage to the fan casing is a possibility. WHAT WE CLAIM IS: -
1. A cross-ventilated, in-line, centrifugal fan arrangement comprising a casing defining a flow path for a gaseous stream, said casing having an inlet and an outlet on the longitudinal axis of said casing whereby it may be interposed in trunking, a centrifugal impeller rotatable at said inlet on an axis coincident with said longitudinal axis, an inlet cone for directing in-flow to the said impeller, a hollow stream-lined strut extending across said casing with an electric motor mounted in said strut for directly
driving said impeller, the medial part of said casing being rectangular in crosssection, said medial part merging smoothly into said inlet and outlet portions at least one of which is circular, and the trailing edge of said hollow stream-lined strut extending substantially up to the outlet of said casing.
2. A cross-ventilated in-line centrifugal fan arrangement, according to claim 1, wherein the inlet portion of the casing is circular in cross-section, and the outlet portion is square or rectangular in crosssection.
3. A cross-ventilated in-line centrifugal fan arrangement, as claimed in either of the preceding claims, wherein said impeller is of mixed flow type.
4. A cross-ventilated in-line centrifugal fan arrangement, as claimed in any of the preceding claims wherein the electric motor is mounted within the hollow stream-lined strut upon a horizontal base plate of the stream-lined strut.
5. A cross-ventilated in-line centrifugal fan arrangement, as claimed in any of the preceding claims 1-4, wherein the electric motor is front mounted on a plate secured to the fore part of the hollow stream-lined strut.
6. A cross-ventilated in-line centrifugal fan arrangement, substantially as herein described with reference to Figures 1 and 2 or Figure 3, or Figures 4 and 5, of the drawings accompanying the Provisional Specification, or Figure 6 of the accompanying drawing.
GB3496276A 1977-08-24 1977-08-24 Cross-ventilated centrifugal fan arrangement Expired GB1572611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3496276A GB1572611A (en) 1977-08-24 1977-08-24 Cross-ventilated centrifugal fan arrangement

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Application Number Priority Date Filing Date Title
GB3496276A GB1572611A (en) 1977-08-24 1977-08-24 Cross-ventilated centrifugal fan arrangement

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GB1572611A true GB1572611A (en) 1980-07-30

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3219453A1 (en) * 1982-05-24 1983-11-24 Josef Dipl.-Ing. 7758 Meersburg Mollerus Device with a blower
US4509683A (en) * 1981-11-30 1985-04-09 Josep Ramisa Navarro Apparatus for dispersing atomized liquid
FR2570445A1 (en) * 1984-05-03 1986-03-21 Equip Thermique Automatique Bladed wheel centrifugal fan with motor outside the conveyed fluid, the intake and delivery ports of which lie on one longitudinal axis
GB2286856A (en) * 1994-02-16 1995-08-30 Mitsubishi Electric Corp Blower
WO2016127659A1 (en) * 2015-02-10 2016-08-18 南通大通宝富风机有限公司 Containment building atmospheric monitoring system fan

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509683A (en) * 1981-11-30 1985-04-09 Josep Ramisa Navarro Apparatus for dispersing atomized liquid
DE3219453A1 (en) * 1982-05-24 1983-11-24 Josef Dipl.-Ing. 7758 Meersburg Mollerus Device with a blower
FR2570445A1 (en) * 1984-05-03 1986-03-21 Equip Thermique Automatique Bladed wheel centrifugal fan with motor outside the conveyed fluid, the intake and delivery ports of which lie on one longitudinal axis
GB2286856A (en) * 1994-02-16 1995-08-30 Mitsubishi Electric Corp Blower
GB2286856B (en) * 1994-02-16 1998-09-16 Mitsubishi Electric Corp Blower
WO2016127659A1 (en) * 2015-02-10 2016-08-18 南通大通宝富风机有限公司 Containment building atmospheric monitoring system fan

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PCNP Patent ceased through non-payment of renewal fee