JPS58160586A - Liquid sealed pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises an impeller that is surrounded by a plate, a nine-boat grate arranged on the side of the impeller, a canopy ring that eccentrically surrounds the impeller and operates together with it, and a discharge port of the boat plate. and a cavitation reducing means provided in the impeller working space which is not immersed in the liquid ring connected to the suction port.

In such a liquid ring pump, which is known from German Patent Publication no. Since the carrier gas is constantly supplied, the pressure rises slowly to the discharge port of the port grate. - This opening is used for suction of non-carrier gas in range H where it does not penetrate into the housing ring of the section between the vanes.・If an ejector is connected before the suction piping, such non-carried gas is constantly supplied from the suction port itself via the ejector. This is well known.

In both cases, the non-carried gas reduces the capacity of the pump and requires an ejector or cylindrical opening connection piping located outside the pump.

This invention has the effect of preventing pressure cavitation without using a non-carrier gas that requires constant supply, reduces pump capacity, and requires additional parts such as those described above outside the pump. The purpose is to give.

The purpose of this is to install at least one part of the impeller side of the port grate, which is circumferentially close to the leading edge of the discharge port and sufficiently separated from the suction port in the circumferential direction, in the liquid ring pump of the type mentioned above, within the range of the working space. Two groove-like recesses are provided, and the reverse flow of the carrier gas from the inter-blade section passing by the armpit recess to the following inter-blade section is controlled by the two recesses.

The recessed portion may be formed in a linear shape and arranged in a substantially tangential direction with respect to the impeller boss, or may be formed in an arc shape and arranged along an arc substantially concentric with the impeller boss. In both cases the recess begins at a sufficient distance from the suction opening so that undesirable backflow into the suction opening does not occur. Instead of one recess in the active area, it is also possible to provide at least two radially separated recesses which meet the above requirements.

In place of one or more elongated recesses, nine partial recesses may be provided in the area covered by the forebale, spaced apart from each other, and these recesses may have different shapes and sizes (as the case may be). It means to have one or both of them.

Next, an embodiment of a liquid ring pump based on the present invention will be explained in detail by section. In Figure Is1, an impeller 2 having two impellers and an inter-blade section 2B is housed in a cylindrical casing 1. The three inner contours of the cylinder 3 are indicated by diagonal lines and are surrounded by this impeller ring 3, and the three inner contours of the wrinkle cylinder 3, which occur eccentrically with respect to the two impeller knives during operation, are indicated by diagonal lines. 4 and the discharge port 5 is defined as an operating space that is not submerged in the housing ring. In this working space, an O-shaped recess 6 shown by a solid line is arranged in the port plate impeller, and this recess starts at a key point apart from the end of the suction port 4 by an angle and is immediately adjacent to the start end of the discharge port 5. The concave portion 6 that ends at the front can be divided into a plurality of partial concave portions 6AK separated from each other as shown by broken lines. Further, in some cases, a continuous recess 6' of JI2 which is engaged in the radial direction may be additionally provided as shown by the dashed line in this recess. Can be divided into partial recesses.

By forming and arranging continuous good concave portions or partial concave portions in the above-mentioned circular shape inside the actuator 9, the pressure at the discharge port can be changed from the suction port pressure P1 when there is no such concave portion, as shown by the concentrated lines in Fig. 2. The sudden pressure increase on the PD is indicated by the dashed line.
1ll! As shown in I, it becomes gentle in front of the discharge port. This is because the gas compressed in the vane section m 2B partially flows back through the recesses 6, 6A, 6' into the following inter-vane section. In this case, since there is no separate non-carrying β gas, there is no reduction in capacity as in liquid ring pumps operating with non-carrying gases.

The gentle pressure car gently collapses the bubbles that are generated, and cavitation does not actually occur on either the impeller or the side wall.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view perpendicular to the O-axis of a liquid ring pump including three embodiments of the present invention, and FIG. 2 shows the pressure rise from the suction port to the discharge port without and with the means based on the present invention. This is a pressure characteristic diagram. In the drawing, 2 is the impeller, and 211 is the impeller section - 13F.
i-9n 1.4 is ll included 0, s#itt exit, 6.6'
The ore recess, 6A is a partial recess, and 7 is a port plate.

Claims (1)

[Scope of Claims] 1) - A rolling impeller, a boat grate disposed on the side of the impeller, a liquid tank eccentrically surrounding the impeller and rotating together therewith, and a discharge plate of the boat plate; In a cooling pump equipped with a cavitation reduction means provided in the impeller working space that does not soak in the liquid ring formed between the outlet and the suction port, a cavitation reduction means is provided at the front edge of the discharge port on the impeller side of the boat plate. 9. A commode pump characterized in that at least one groove-shaped recess is provided within the range of the working space, close to the suction port in the circumferential direction and sufficiently separated from the suction port in the circumferential direction. 2. Claims - The liquid ring pump according to claim 1, wherein the recess is elongated in the circumferential direction. 3) In the pump according to claim 1182,
A liquid ring pump, wherein the recess is formed in a straight line. 4) A liquid ring pump according to claim a, wherein the recessed portion is formed in an arc shape as %*. 5) A liquid prick pump according to any one of claims 1 to 4 rattan, in which at least two of the recesses that are mutually shifted in the radial direction are provided on the same boat plate. . 6) The pump according to any one of claims 11 to 5, characterized in that, in place of the continuous recess, a plurality of partial recesses spaced apart from each other are installed within the range covered by the continuous recess. Liquid seal and pump.