RU1835453C - Appliance for evacuation of concrete mixtures - Google Patents

Abstract

Usage: relates to the technology of vacuum accumulation of concrete and can find application in construction. SUMMARY OF THE INVENTION: the housing has a closed chamber with a tangential channel for supplying a working medium and a channel coaxial with the closed chamber, connected to the atmosphere and the housing, the channel communicating with the atmosphere being made on the opposite side of the closed chamber from the housing. 4 ill.

Description

The invention relates to a technique for evacuating concrete mixtures and may find application in construction work and the manufacture of concrete products.

The purpose of the invention is the expansion of technological capabilities by providing vacuum purification in various construction sites with a mobile compressor.

Figure 1 schematically shows the proposed device, a longitudinal section; figure 2 is a section aa in figure 1; Fig. 3 is an embodiment of a rarefaction source with a countercurrent of the working medium; Fig. 4 is an embodiment of a rarefaction source with an annular vortex acceleration chamber and countercurrent fluid.

A device for evacuating concrete mixtures comprises a housing 1, a vacuum cavity 2 and a vacuum source 3.

The vacuum cavity 2 is made in the housing 1, which is a shield with stiffeners and filtering elements (not shown in the drawing) and a seal 4 around the periphery of the shield. Source of vacuum 3

mounted on the housing 1 and made in the form of a closed annular chamber 5, formed by the side 6 and end 7 and 8 surfaces, as well as the pipe 9 and the mixing chamber 10. Channel 11 in the pipe 9 communicates a vacuum cavity with the mixing chamber 10. The surface 12 of the pipe 9, the side surface 6 of the chamber 5, the surface of the chamber 10 and the surface 13 of the channel 11 are aligned. The supply 14 is made tangentially to the surface 6 in the form of a cylindrical hole or a tapering nozzle 15. The end surfaces 7 and 8 of the chamber 5 are connected with the surface of the chamber 10 and the surface 12 of the pipe 9 by means of curved surfaces 16 and 17.

The device operates as follows.

When the medium is supplied from the pneumatic network from a mobile compressor or compressed gas cylinder, this medium accelerates in the inlet 14 and flows into the chamber 5, forming a free vortex in it. This vortex accelerates in chamber 5 and flows into the chamber

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mixing 10, forming a vacuum in it, the maximum value of which is achieved in the axial zone of the chamber 10. This vacuum sucks the medium of the vacuum cavity 2 through the channel 11, forming a vacuum in the vacuum cavity 2. The concrete mixture located under the device is subjected to vacuum vanyu ..

Execution is possible when the rarefaction source is in the form of a cylindrical chamber 18 with a tangential inlet 14 of the working medium. In the chamber 18 there is a pipe 19 with an inlet cone 20 and a cylindrical channel 21. In the channel 21 with a gap 22 a pipe is located. 23 with a channel 24 communicating a vacuum cavity 2 with a channel 21. The outer surface 25 of the pipe 23 is joined by a curved surface 26 and forms a confuser 27.

The execution works similarly to that described except that the free vortex in the chamber 18 is lowered, turned around and flows into the channel 21 through the confuser 27.

Execution is possible when the rarefaction source is in the form of a cylindrical chamber 28 in communication with an annular chamber 29 formed by a side 30 and end surfaces 31 and 32. Camera 28 with a camera. 29 is interfaced by a curved surface 33. The chamber 28 is connected to the channel 35 by means of an annular expansion channel 34

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embedded in the pipe 36, partially located in the chamber 28. The channel 34 is formed by the conical surface 37 of the pipe 36 and the conical surface 38 of the passive nozzle 39. The nozzle 39 communicates a vacuum cavity 2 with a channel 35,

It is possible to implement the device when the housing 1 is made not in the form of a flat shield, but in the form corresponding to the shape of the vacuum product - cylindrical, curved, etc.

The device allows the concrete mixture to be evacuated at any construction site where there is a pneumatic network and where a mobile compressor and a compressed gas cylinder can be delivered.

FORMULA AND SECTION

A device for evacuating concrete mixtures, comprising a housing with a vacuum cavity connected by a channel to an energy source and a filter element, characterized in that, in order to expand technological capabilities by providing vacuum in various construction sites with a mobile compressor, the housing is equipped with a closed chamber with a tangential channel for supplying a working medium and a channel coaxial to the closed chamber, a channel communicated with the atmosphere and with the housing, while the channel communicated with the atmosphere is made with a counter The side of the closed chamber from the housing.

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