SU1390308A1 - Ejector-type needle filter - Google Patents

Description

(21) 4J42075 / 29-33

(22) 11/04/86

(46) 04.23.88. Bul No. 15 (71) All-Union Scientific Research Institute of Water Supply, Sewerage, Hydraulic Engineering and Engineering Hydroology of WODGEO and the Special Design and Technological Bureau of Glavmosinzhstro (72); B.S. Krakowski, K.S. Bogolyubov, A.S. Kuzmina, B.M. Przhedetsky and Yu.I. Levitin (53) 624.152.612.2 (088.8) (56) Reference book of a civil engineer. - M .: stroiizdat, 1970, t.II, p.334.

Guidelines for the production and acceptance of work in the device bases and facies. NISHSP. - M .: stroiizdat, 1977, pp.36-39.

(54) EJECTOR IGLOFILTER (57) The invention relates to the construction, in particular to a decrease in the level of groundwater during the drainage of pits. The purpose of the invention is to improve the performance and reliability of the ejector needle filter. This is achieved by the fact that the needle filter is equipped with a guide device for swirling the flow of pressurized water, the propellant in the pressure chamber and an additional seal between the seat and the tip of the ejector, and the input channels of the pressure chamber are offset relative to the longitudinal axis of the ejector. By twisting the flow of pressure water, the performance of the ejector needle filter increases by more than 20%. 1 hp f-ly, 4 ill.

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The invention relates to the construction of |: tva, in particular to the means of lowering the level of groundwater during the drainage of pits.

The purpose of the invention is to improve the performance and reliability of the ejection needle filter.

Figure 1 shows the ejector needle filter, a general view; figure 2 - ejector, longitudinal section; on fig.Z - the lower node of the ejector, a longitudinal section; FIG. 4 shows an ejector, a transverse 1st section.

The ejector needle filter contains Concentrically located outer | 1 and inner 2 pipes attached to the lower part of pipe 1 filter 3 with a crown 4, installed in the upper part of the gap between pipes 1 and 2, a seal 5, made in the form of a blender attached to the lower 1 END of pipe 2 ejector 6 and the lower additional Compressor 7, made in the form of a rubber or paronitovogo ring.

The ejector 6 consists of a diffuser 8, a mixing chamber 9 placed on its outer surface of the guide vane 10 in the form of, for example, a set of plates or rods inclined in relation to the longitudinal axis of the ejector, an end 11 placed inside its insert 12, the upper part ends with a nozzle 13, in the middle part having a cylindrical pressure chamber 14, and in the lower part it is jammed with a conical propellant 15 with a top located at the level of the inlet section of the nozzle 13.

In the end switch 11, two windows 16 are executed, and in insert 12 two windows 17 are combined with each other and welded around the contour with hermetic welded bar B. As a result, the twin windows 16 and 17 form the inlet channels of the pressure chamber 14. The inlet channels are offset from the longitudinal axis of the needle filter in such a way that one of the walls of each channel is tangentially mating with the inner cylindrical surface of the pressure chamber 13, and the other wall has a direction tangential to the height average cross section of the displacer 15.

The lower part of the limit switch 11 has a conical tip 18, which hermetically presses the seal 7 to the conical seat 19 of the coupling 20, which connects the bottom 0

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Nyugo part of the pipe 1 with the filter 3. The seal 7 is clamped between the saddle 19 and the protrusion of the pipe 21, Attached to the lower part of the pipe 1, which provides a seal of the working water cavity 22 in relation to the ejected water cavity 23. Segmental channels 24 are formed with the cavity 23, which are formed by the inner surface of the end switch 11 and the outer walls of the insert 12, which has a diamond shape in cross section. The channels 24 are in communication with the receiving cavity 25, located in front of the entrance to the mixing chamber 9.

The ejector needle filter works as follows.

In the cavity 22 between the pipes 1 and 2 serves under the desired pressure of the working water. Passing through the guiding device 10 and acquiring the required twist, the flow of water enters the inlet channels 16 and 17, offset from the longitudinal axis of the needle filter. Pre-twisting and displacement channels give the working water rotation first in the pressure chamber 14, and then at the exit of the nozzle 13. The presence in the pressure chamber 14 is tapered

propellant 15 eliminates harmful vortices in the central part of the pressure chamber and improves the conditions of approach of the working water to the nozzle 13.

The discharge created by the working jet in the receiving chamber 25 is transmitted through the segment channels 24 to the filter 3. As a result, the ground water through the filter 3 and the segment channels 24 enters the area of the greatest discharge in the receiving chamber 25, and from there, together with the rotating a jet pouring out of the nozzle 13 into the mixing chamber 9 and the diffuser 8, from which the mixture of working and ejected water is directed through the pipe 2 beyond the limits of the ejector needle filter.

Giving the working water jet a rotary motion at the exit of the nozzle increases the degree of ejection and, therefore, increases production; the ejector needle filter, and the additional lower seal increases its reliability.

Claims (1)

1. Ejector needle filter containing concentric located on the outer and inner pipe with a gap between them and the gap seal in the upper part, attached to the lower end of the outer pipe is a saddle and a filter with a crown and an ejector having a diffuser, a mixing chamber, a nozzle, a pressure chamber with inlet channels and a tip, characterized by in order to increase productivity and reliability, the ejector needle filter is fitted with a guide device fixed on the outer surface of the mixing chamber to direct the flow of pressurized water installed in the pressure chamber coaxially with Plomo v1ytesnitelem and disposed between the seat and the tip ejector additional compactor, the input axis the pressure chamber channels are located in parallel planes symmetrically with respect to the longitudinal axis of the ejector with the location of one wall of each channel tangential to the inner surface of the pressure chamber and the other wall tangential to the height section of the displacer, with the top of the displacer located , the tip of the ejector is made with a conical surface facing the saddle, and the displacer is in the form facing top of the nozzle cone: 2 The needle filter according to claim 1, wherein the guide vane is designed as a group of plates or rods inclined to the longitudinal axis of the ejector. 22U. phi2 3 FIG. /five