Multiblade radial fan and method for making same
AssigneeToto Ltd.
InventorsNoboru Shinbara, Makoto Hatakeyama
Life of this patent
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Abstract
Noise is minimized in the design of multiblade radial fans, wherein the specifications of the impeller of a multiblade radial fan are determined so as to satisfy the correlation expressed by the formula .nu..gtoreq.-0.857Z.sub.1 +1.009 (in the preceding formula, .nu.=r.sub.0 /r.sub.1, Z.sub.1 =(r.sub.1 -r.sub.0)/r.sub.1 -nt/(2.pi.), where r.sub.0 is the inside radius of the impeller, r.sub.1 is the outside radius of the impeller, n is the number of radially-directed blades, and t is the thickness of the radially-directed blades).
Claims12
A multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, wherein the impeller satisfies the formula:
- .nu..gtoreq.-0.857Z.sub.1 +1.009,
- wherein .nu.=r.sub.0 /r.sub.1, and Z.sub.1 =(r.sub.1 -r.sub.0)/r.sub.1 -nt/(2.pi.)!.
A multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, wherein the impeller satisfies the formulas:
- .nu..gtoreq.-0.857Z.sub.1 +1.009
- and
- 0.8.gtoreq..nu..gtoreq.0.4,
- wherein .nu.=r.sub.0 /r.sub.1, and
- Z.sub.1 =(r.sub.1 -r.sub.0)/r.sub.1 -nt/(2.pi.)!.
A multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, wherein the fan satisfies the formula:
- (1.009-.nu.)/(1-.nu.).ltoreq.Z.sub.2,
- wherein .nu.=r.sub.0 /r.sub.1,
- Z.sub.2 =0.857{t.sub.0 /(2.pi.r.sub.1 /n)-t!+1}, and
- t.sub.0 is a reference thickness=0.5 mm).
A multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, wherein the impeller satisfies the formulas:
- (1.009-.nu.)/(1-.nu.).ltoreq.Z.sub.2
- and
- 0.8.gtoreq..nu..gtoreq.0.4,
- wherein .nu.=r.sub.0 /r.sub.1,
- Z.sub.2 =0.857{t.sub.0 /(2.pi.r.sub.1 /n)-t!+1}, and
- t.sub.0 is a reference thickness=0.5 mm).
A method for making a multiblade radial fan, comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, the methods comprising the steps of:
- specifying the impeller so as to satisfy a formula:
- .nu..gtoreq.-0.857Z.sub.1 +1.009,
- wherein .nu.=r.sub.0 /r.sub.1, Z.sub.1 =(r.sub.1 -r.sub.0)/r.sub.1 -nt/(2.pi.)!;
- and
- making a fan comprising the specified impeller.
A method for making a multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially-directed blades, each blade having a thickness t, the method comprising the steps of;
- specifying the impeller so as to satisfy the formulas:
- .nu..gtoreq.-0.857Z.sub.1 +1.009
- and
- 0.8.gtoreq..nu..gtoreq.0.4,
- wherein .nu.=r.sub.0 /r.sub.1, Z.sub.1 =(r.sub.1 -r.sub.0)/r.sub.1 -nt/(2.pi.)!;
- and
- making a fan comprising the specified impeller.
A method for making a multiblade radial fan comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, and a number n of radially directed blades, each blade having a thickness t, the method comprising the steps of;
- specifying the impeller so as to satisfy the formula:
- (1.009-.nu.)/(1-.nu.).ltoreq.Z.sub.2,
- wherein .nu.=r.sub.0 /r.sub.1,
- Z.sub.2 =0.857{t.sub.0 /(2.pi.r.sub.1 /n)-t!+1}, and
- t.sub.0 is a reference thickness=0.5 mm);
- and
- making a fan comprising the specified impeller.
A method for making a multiblade radial fan, comprising an impeller having an inside radius r.sub.0 and an outside radius r.sub.1, a number n of radially-directed blades, each blade having a thickness t, the method comprising the steps of;
- specifying the impeller of multiblade radial so as to satisfy the formula:
- (1.009-.nu.)/(1-.nu.).ltoreq.Z.sub.2
- and
- 0.8.gtoreq..nu..gtoreq.0.4,
- wherein .nu.=r.sub.0 /r.sub.1,
- Z.sub.2 =0.857{t.sub.0 /(2.pi.r.sub.1 /n)-t!+1}, and
- t.sub.0 is a reference thickness=0.5 mm);
- and
- making a fan comprising the specified impeller.
Dependencies are inferred from the claim text.