JPH0247278Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a partial impeller for causing fluid to flow in a shaft sealing portion for the purpose of removing heat generated by sliding of a shaft sealing device.

[Conventional technology]

A partial impeller is located in a space sealed with a mechanical seal, for example, and is attached to a shaft, and rotates with the shaft to flow the sealing fluid in the axial direction, thereby removing heat generated by sliding of the mechanical seal. For example, as shown in FIGS. 3 and 4, one end surface 1 of the annular body 11 is attached to the shaft 13.
A pump is known in which a plurality of pumping holes 12, 12, . .

This partial impeller uses the centrifugal force generated in the pumping hole 12 as the annular body 11 rotates to open the suction port 12 that opens on the end surface 11a side.
By discharging the fluid from a to the discharge port 12b, the fluid flows in the axial direction as a whole.

[Problem that the invention attempts to solve]

However, in this partial impeller, since the direction of each pumping hole 12 is perpendicular to the rotational direction R when viewed from the front or the outer periphery, the fluid cannot be sucked in efficiently from the suction port 12a. -H characteristics (Q: flow rate, H: head)
was wrong.

Therefore, the present invention was developed with the aim of improving the pumping efficiency of a partial impeller having pumping holes.

[Means for solving problems]

That is, in the present invention, a plurality of pumping holes are formed in a ring-shaped body that is pivotally attached to the shaft, and are equally spaced in the circumferential direction and extend through the circular body from the inner diameter part of the one end face to the outer diameter side. In a partial impeller having an opening as a suction port and the other opening as a discharge port, a suction guide groove is provided on the one end surface extending from the suction port of each pumping hole in the rotational direction and reaching the vicinity of the adjacent suction port; The above-mentioned problem is solved by constructing the suction guide groove so that it gradually becomes deeper toward the groove end on the opposite rotation side where the suction port is opened.

[Effect]

According to the above configuration, as the suction guide groove rotates, the fluid on the front surface thereof is relatively guided to the suction port of the pumping hole, and furthermore, this groove becomes gradually deeper toward the counter-rotation side. Since the suction port opens at the end of the groove on the counter-rotation side, where the groove depth is the deepest, fluid is guided to the suction port very efficiently by a kind of spiral effect caused by the movement of the inclined surface.

〔Example〕

Next, a preferred embodiment of the partial impeller of the present invention shown in FIGS.
. . . are a plurality of pumping holes extending from the inner diameter portion of the one end surface 1a of the annular body 1 toward the outer circumferential taper 1b at an angle toward the outer diameter side and equally spaced in the circumferential direction.

The end surface 1a has a suction port 2a adjacent to the suction port 2a of the pumping hole 2 opened in the end surface 1a.
A suction guiding groove 3 extending in a tangential direction that substantially coincides with the rotational direction R is recessed toward the vicinity of the rotation direction R, and the bottom surface 3a thereof is an inclined surface that is deepest at the groove end on the opposite rotation side where the suction port 2a opens. is doing.

According to this configuration, when the annular body 1 rotates in the direction of the arrow R together with a shaft (not shown), the fluid existing on the end surface 1a side is The suction guide groove 3 relatively flows toward the groove end on the anti-rotation side where the groove depth is the deepest, hits the groove end, and is forcibly guided to the suction port 2a.
The pumping head and efficiency are improved.

[Effect of idea]

As described above, the partial impeller of the present invention has a suction guide groove that is provided on one end surface and gradually deepens toward the anti-rotation side, and when the partial impeller rotates, the suction guiding groove is opened at the end of the groove on the anti-rotation side. Since the fluid is guided to the suction port of the pumping hole, the amount of suction from the suction port increases, resulting in excellent effects such as a marked improvement in head and efficiency.

[Brief explanation of the drawing]

Fig. 1 is a half-cut front view showing an embodiment of the partial impeller of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a half-cut front view showing an example of a conventional partial impeller, and Fig. 4 is the same mounted. It is a side sectional view of a state. DESCRIPTION OF SYMBOLS 1... Annular body, 1a... End surface, 1b... Outer periphery taper surface, 2... Pumping hole, 2a... Suction port, 2
b...Discharge port, 3...Suction guide groove, 3a...Bottom surface.

Claims (1)

[Scope of utility model registration request] A plurality of pumping holes are formed in an annular body that is pivotally attached to the shaft, and are equally spaced in the circumferential direction, passing through the annular body at an angle from the inner diameter part of one end face to the outer diameter side, and the opening on the inner diameter side of the one end face is used as an intake port, and the other In a partial impeller having an opening as a discharge port, a suction guide groove is provided on the one end face, extending from the suction port of each pumping hole in the rotational direction and reaching the vicinity of the adjacent suction port; A partial impeller characterized by a groove that gradually becomes deeper toward the end of the groove on the anti-rotation side where the mouth is open.