Rotary kinetic fluid motors or pumps – Runner has spirally arranged blade or fluid passage – Extending along runner axis
Patent
1983-12-08
1984-09-11
Marcus, Stephen
Rotary kinetic fluid motors or pumps
Runner has spirally arranged blade or fluid passage
Extending along runner axis
415143, 415169A, F01D 500, F01D 1100
Patent
active
044707525
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pump for supplying liquid fuel which is useful for liquid fuel combustion apparatus and which has stable pressure-flow rate characteristics and is capable of supplying liquid fuel to such a combustion apparatus stably at a very small rate.
BACKGROUND ART
Liquid fuel supply pumps useful for liquid fuel combustion apparatus generally comprise a cylinder B disposed in a solenoid A and a plunger C supported within the cylinder B by an upper spring D and a lower spring E and movable upward and downward, as shown in FIG. 1.
A power supply of modulated pulse width is connected to the solenoid A to intermittently drive the plunger C up and down and supply liquid fuel to a liquid fuel combustion apparatus at a rate of about 5 cc to 8 cc/min.
However, with the wide use of space heaters, it has been strongly desired in recent years to give a variable heat output over a wider range than heretofore possible for more delicately controlled comfortable space heating or for savings in energy.
However, when giving a heat output which is variable, for example, from 3500 Kcal/h to 1000 Kcal/h, the supply of liquid fuel by the pump shown in FIG. 1, which is 5 cc to 8 cc/min, must be reduced to not larger than 1/3 the amount, i.e. 1 to 3 cc/min. To give a still smaller heat output, the supply must be reduced further.
Nevertheless, when for example obtaining a heat output of 3500 Kcal/h by driving the plunger C at a pulse frequency of 10 Hz, the plunger output per stroke must be ##EQU1## Since the flow rate of the pump of FIG. 1 is limited to the range of 5 cc/min in view of accuracy, it is impossible to obtain the above variable range of low heat outputs.
Further gear pumps involve a lower limit of as much as 30 cc/min due to the leakage of the fluid through the gear-to-gear clearance. The gear pump thus also fails to give the above variable range of low heat output.
DISCLOSURE OF INVENTION
Accordingly the object of the invention is to make it possible to supply liquid fuel to liquid fuel combustion apparatus stably at an exceedingly reduced rate.
An embodiment of the present invention will be described below with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view showing a liquid fuel supply pump generally used conventionally;
FIG. 2 is a sectional view of a liquid fuel supply pump according to an embodiment of the invention;
FIG. 3 is a plan view of a rotor in FIG. 2;
FIG. 4 is a sectional view showing the flow of kerosene;
FIG. 5 is a diagram showing the arrangement of a rotary gasifying burner and the ump of FIG. 2 as used therefor;
FIG. 6 is a diagram showing P-Q characteristics with use of .DELTA.R as a parameter;
FIG. 7 is a characteristics diagram showing Qmax relative to ho;
FIG. 8 is a characteristics diagram showing Pmax relative to ho with use of .DELTA.R as a parameter;
FIG. 9 is a diagram showing flow rate characteristics relative to speed of rotation;
FIG. 10 is a diagram showing the pressure variation characteristics of the conventional liquid fuel supply pump shown in FIG. 1 and the liquid fuel supply pump embodying the invention and shown in FIG. 2;
FIG. 11 is a sectional view showing a liquid fuel supply pump according to another embodiment of the invention; and
FIG. 12 is a plan view of a rotor in FIG. 11.
BEST MODE OF CARRYING OUT THE INVENTION
With reference to FIG. 2, a cylindrical rotary shaft 1 which is a rotary member is rotatably housed in a hollow cylindrical housing 2 which is a stationary member. A rotor 3 for a motor fixed to the rotary shaft 1 is opposed to a stator 4. The stator 4 is accommodated in a case 5. The case 5 is fastened to the housing by bolts 6. On the other hand, the housing 2 has a lower cover 7 attached to its lower end. The housing 2 further has at a lower portion thereof inlet bores 8 extending through its side wall. The case 5 has an outlet bore 9 extending centrally therethrough. The rotary shaft 1 has a port 10 in its outer peripheral portion. An axial flow chann
REFERENCES:
patent: 268606 (1882-12-01), Barbour et al.
patent: 3171356 (1965-03-01), Pensabene
patent: 3643516 (1972-02-01), Jacobson
patent: 3870433 (1975-03-01), Raikov et al.
Fumio Iwai
Hiroo Oshima
Teruo Maruyama
Yoshikazu Abe
Farley Joseph W.
Marcus Stephen
Matsushita Electric - Industrial Co., Ltd.
Pitko Joseph M.
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