JPS58144695A - Special fluid pump - Google Patents

Abstract

PURPOSE:To reduce the necessary torque of an impellor to contribe the increasing of the revolving speed and the flow amount of the pump as well as the improvement of the performance thereof by a method wherein the central inlet area of the pump impellor is choked, vanes are made so as to have linear-shapes and the angle of the vane near the outlet of the impellor is increased toward the reverse direction of the revolution thereof. CONSTITUTION:Since the flow path area of the inlet 2 of the impellor is narrowed, the impellor is sucked toward the outflow direction of the fluid when the inflow fluid is flowed out toward the direction of the flow path 3 due to the inducting effect, the torque necessary for the impellor is reduced and the performance of the impellor is improved. The vane is linear and slanted until the vicinity of the outlet thereof substantially at the part of the vane 4, therefore, a large velocity head is generated together with a centrifugal force in the fluid when the impellor is revolved. The angle of the vane near the outlet 3 of the impellor is greately increased toward the reverse direction of the revolving direction thereof, therefore, the outflow fluid flows along the circumference substantially and thereby reducing the torque necessary for the impellor and increasing the flow amount of the pump.

Description

DETAILED DESCRIPTION OF THE INVENTION The feature of the present invention lies in the inlet 2 shown in FIG. In other words, if the situation is as shown in the figure, the impeller will be placed in the direction in which the fluid flows out. . That is, in the direction of the arrow.

This reduces the torque of the pump impeller and greatly improves performance. The effect is even greater when guide vanes are attached.

Next, in the part of the blade 4, since the blade is generally straight up to the vicinity of the outlet and is oblique, when rotation is applied to the impeller, the fluid generates a centrifugal force and a large velocity head. Moreover, since the impeller crest 3 has a large blade angle in the opposite direction to the rotation direction only near the outlet, the outflowing fluid flows roughly around the circumference, so the torque of the impeller becomes small. , and the flow rate is large. This is because the torque of the pump impeller is proportional to the circumferential component of the fluid flowing out. This can be said because the pump torque is determined by the difference in angular momentum. The above three effects make this a very good pump impeller.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the present invention, and FIG. 2 is a schematic longitudinal cross-sectional view. The symbols are 1: rotating shaft, 2: pump population, 3: pump outlet, and 4: intermediate vane of the pump. Patent applicant Yoshio Sato JVI L11'; J Mon 7'7 ノ] 1 Yosu temple administration office ゛ Heart killing 1, flat Ishi n pe (J. Yo 1z or Schif's neck erection //rBl begging # ~ Utsu se IK, I'' Ding nt 'n7.31゛m5:
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Claims (1)

[Claims] As shown in Figure 2, the area of the impeller inlet is made small so that rotational force is applied in the direction of the arrow due to the eye patch effect, so that the impeller blades 4 are roughly straight and the impeller exit is made as shown in Figure 2. Nearby is a pump impeller whose performance has been improved by taking a large blade angle in the opposite direction to the direction of rotation of the impeller, as shown in the diagram.