US2011110799A1PendingUtilityA1
Liquid pump
Est. expiryNov 11, 2029(~3.3 yrs left)· nominal 20-yr term from priority
F04D 5/002F04D 29/669
41
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Claims
Abstract
In a liquid pump, n sets of concavities are formed in an outer circumference of an impeller. In a case where an angle between an i th first line and an i th second line is a pitch angle θ i and an i th difference of adjacent pitch angles is σ i (σ i =θ i+1 −θ i ) (the i may be any integer of 1 to n), the pitch angles θ i may be inhomogeneous. For each of the pitch angles θ i , there may be one or more other pitch angle θ k (the k maybe any integer of 1 to n and other than i) being equal to the pitch angle θ i . Formulas 0.05≦σ′/(average of θ)≦0.30 and 0.15≦C′≦0.35 may be satisfied.
Claims
exact text as granted — not AI-modified1 . A liquid pump comprising:
a pump casing, and an impeller rotatably disposed within the pump casing, wherein n sets of concavities are formed in an outer circumference of the impeller, the n being an integer of 2 or more, in a case where an angle between an i th first line and an i th second line is a pitch angle θ i and an i th difference of adjacent pitch angles is σ i (σ i =θ i+1 −θ i ), the i th first line is a line connecting a rotation center of the impeller and a center of i th concavity in a circumferential direction of the impeller, the i being any integer of 1 to n, and the i th second line is a line connecting the rotation center of the impeller with a center of i+1 th concavity in the circumferential direction of the impeller, where in case of i+1=n+1, then i+1=1, the pitch angles θ i are inhomogeneous, and for each of the pitch angles θ i , there is one or more other pitch angle θ k being equal to the pitch angle θ i , the k being any integer of 1 to n and other than i, and following formulas (1) and (2) are satisfied:
0.05≦σ′/(average of θ)≦0.30 (1)
0.15≦C′≦0.35 (2)
where
average
of
θ
:
θ
_
≡
∑
i
=
1
n
θ
i
/
n
σ
′
≡
(
∑
i
=
1
n
(
σ
i
-
σ
_
)
2
)
/
n
σ
_
≡
∑
i
=
1
n
σ
i
/
n
C
′
≡
∑
j
=
1
n
(
C
j
)
2
/
n
C
j
≡
1
n
θ
′
2
∑
i
=
1
n
(
θ
i
-
θ
_
)
·
(
θ
i
+
j
-
θ
_
)
θ
′
≡
(
∑
i
=
1
n
(
θ
i
-
θ
_
)
2
)
/
n
2 . The liquid pump as in claim 1 , wherein
a following formulas (3) and (4) are further satisfied:
0.20≦σ′/(average of θ)≦0.30 (3)
0.20≦C′≦0.30 (4)
3 . The liquid pump as in claim 1 , wherein
a following formula (5) is further satisfied:
0.1<(a number of pitch angles being equal to each other)/ n< 0.5 (5)
4 . The liquid pump as in claim 1 , wherein
the pump casing comprises a channel, a suction opening, a discharge opening, and an isolating wall, the channel faces the concavities of the impeller and elongates from an upper stream end to a lower stream end along the rotation direction of the impeller, the suction opening communicates the upper stream end of the channel with an outside of the pump casing, the discharge opening communicates the lower stream end of the channel with the outside of the pump casing, and the isolating wall is disposed between the suction opening and the discharge opening in order to prevent liquid to flow from a side of the discharge opening toward a side of the suction opening.
5 . The liquid pump as in claim 1 , wherein
the liquid pump is a fuel pump.
6 . The liquid pump as in claim 1 , further comprising a motor drivingly coupled to the impeller.Join the waitlist — get patent alerts
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