RU34434U1 - Abrasive blasting device - Google Patents

Description

, 2f) 03lT8239

mium

MP to B24C 5/04

Device for abrasive blasting.

The invention relates to tools for treating surfaces by means of an abrasive dispersed by a supersonic jet of combustion products.

Known thermo-abrasive inkjet tools (Russian patent No. 1796434, IPC V24C 5/04, publ. BI No. 7, 1993), containing a housing with a nozzle in which a tube for supplying abrasive, and nozzles ..

However, this device is not productive enough.

Closest to the proposed is a device for blasting and abrasive treatment (a.s. No. 1834792, MPK V24S 5/04, publ. BI No. 39, 1993), containing a combustion chamber with a nozzle and supply of compressed air and fuel and a tube for abrasive feed nozzle mounted on the housing of the combustion chamber.

The disadvantage of this device is also not high enough performance, high noise and high dustiness of the workplace.

The task is to develop a device that will improve productivity and operating conditions.

The problem is achieved due to the fact that in the device for blast-abrasive treatment, containing a combustion chamber with a nozzle and fuel supply (oxidizer and fuel), a tube for supplying abrasive material, a nozzle mounted behind the nozzle, according to a utility model, the housing is equipped with a manifold with a nozzle for supplying coolant, and between the nozzle passing through the manifold and the nozzle, an end swirl is installed, in which tangential channels are made associated with the cavity

collector.

The essence of the utility model is illustrated by drawings, where in Fig.1 shows a General view of the device in section,

In FIG. 2 - section along aa.

The device consists of a housing 1 of the combustion chamber with a nozzle 2, on which a manifold 3 is installed with a pipe 4 for supplying coolant. An end swirler 5 having tangential channels 6 is installed between the nozzle 2 and the nozzle. The tangential channels 6 are connected with the cavity of the manifold 3. The nozzles 7 are placed in the manifold 3 and connected to the end swirl 5. In the housing 1 of the combustion chamber along its axis, a tube 8 is installed for supplying abrasive with conveying gas and a glow plug 9 is fixed.

The proposed device operates as follows.

The abrasive through the tube 8 enters the nozzle 2 of the combustion chamber, where it is accelerated by a high-temperature supersonic jet flowing out of the nozzle 2 of the housing 1, and acquires a velocity of 200-300 m / s at the outlet of the nozzle 7. Through the pipe 4, a cooling liquid is supplied to the manifold 3, which, passing through the tangential channels 6, is twisted and, falling into the nozzles 7, creates a water curtain, cooling the walls of the nozzle, reducing the effect of high-temperature flow on the walls of the nozzle. The liquid cools the nozzle 2 in its most heat-stressed part, thereby preventing the erosion of its walls due to the influence of the abrasive, and also prevents the abrasive from spraying into the environment. In addition, by changing the flow rate of the liquid, it is possible to form such a gas-dynamic path of the supersonic part of the nozzle, which provides the highest speed of abrasive, and therefore the productivity of the device.

INCREASE the productivity of jet - abrasive processing due to the regulation of the shape of the supersonic part of the nozzle by the flow rate of the coolant.

In addition, the coolant without loss of performance can reduce the noise level of a supersonic jet in a wide frequency range and improve operating conditions, as the liquid binds the dust resulting from the crushing of the abrasive during operation to the size of 0.1 mm and causing silicosis, falling into the lungs of a person.

Claims (1)

A device for blast-abrasive treatment, comprising a combustion chamber with a nozzle and a fuel supply, an abrasive supply pipe, nozzles mounted on a combustion chamber body, characterized in that the housing is equipped with a manifold with a nozzle for supplying coolant, and between the nozzle passing through the manifold , and an end swirl is installed in the nozzle, in which tangential channels are made associated with the collector cavity.