RU2657818C1 - Suction nozzle of pneumatic transmission unit - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to mechanical engineering and can be used in agricultural production, flour-elevator and feed mill industry for the pneumatic transportation of loose materials, in particular grain, granules of grass flour and other materials in suction pneumatic installations. Suction nozzle comprises an outer tube mounted coaxially inside it, an inner tube connected to a flexible transport conduit, adjusting bolts to change the annular gap between the outer and inner tubes by their mutual axial movement. Suction part of the outer tube is made in the form of a diffuser with an angle of inclination of the walls 30°. Diameter of the diffuser inlet does not exceed the outer diameter of the inner tube.

EFFECT: invention provides, due to a simple, constructive design, a reduction in the unit cost of manufacturing, increasing the productivity of the pneumatic transport unit.

1 cl, 3 dwg

Description

The present invention relates to mechanical engineering and can be used in agricultural production, flour and grain elevator and animal feed industry for pneumatic transportation of bulk materials, in particular grain, grass meal granules and other materials in suction pneumatic plants.

A suction nozzle of a pneumatic conveying system is known, comprising a pipe coaxially mounted inside a pipe connected to a transport pipe and an additional air supply valve to the transport pipe, which is an annular diaphragm attached to the pipe end and placed in an annular gap formed between the pipe and the pipe, moreover, the diaphragm is installed at an angle of 15-20 ° to the end of the pipe [A. 1090646 USSR, MKI B65G 53/14. Suction nozzle of a pneumatic conveying system / Kurochkin V.M., Gritsenko N.F. - No. 3457036 / 27-11; declared 04/09/1982; publ. 05/07/1984, Bull. Number 17. - 3 p.].

This device has a complex structure, which ultimately determines the increase in unit costs for manufacturing.

Another disadvantage of this device is the increased hydraulic resistance, which leads to a decrease in the performance of the pneumatic conveying system.

Also, the next disadvantage of this suction nozzle is that it does not ensure the alignment of the pipe and pipe, which can lead to a violation of the operating mode of the device and to reduce throughput.

Closest to the technical solution and the achieved result, the present invention relates to a suction nozzle of a pneumatic conveying installation, comprising an outer pipe, an inner pipe coaxially mounted inside it with a bell in the form of a confuser, connected to a flexible transport pipe, guide ribs welded to the inner pipe, adjusting bolts for changes in the annular gap between the outer and inner pipes by their mutual axial movement [N. Sychugov Grain pneumatic conveying plants. Tutorial. - Kirov: Higher Agricultural Academy, 2007. - S. 62-63].

The disadvantage of this device is also the increased hydraulic resistance, which leads to a decrease in the performance of the pneumatic conveying system.

Another disadvantage of this device is the large overall dimensions, which ultimately determine the increase in unit costs for manufacturing.

The essence of the invention lies in the fact that the known suction nozzle of a pneumatic conveying installation comprising an external pipe, an inner pipe coaxially mounted inside it, connected to a flexible transport pipe, adjusting bolts for changing the annular gap between the external and internal pipes by their mutual axial movement, the suction part the outer pipe is made in the form of a diffuser with an angle of inclination of the walls of 30 °, and the diameter of the inlet of the diffuser does not exceed the external diameter internally pipe.

As a result of the analysis of literary sources, no identical execution of the proposed device was found. Moreover, distinctive features from the prototype signs give the claimed combination of new properties, manifested in a positive effect.

This device has a simple design and small overall dimensions, which ultimately determine the reduction of unit costs for manufacturing.

The presence of adjusting bolts for changing the annular gap between the outer and inner pipes by their mutual axial movement ensures alignment of the inner pipe with the outer pipe. This circumstance ensures the performance of the process without violating the operating mode of the device and reducing throughput.

The execution of the suction part of the outer pipe in the form of a diffuser with an angle of inclination of the walls of 30 ° does not create increased hydraulic resistance, which does not lead to a decrease in the performance of the pneumatic conveying installation.

Provided that the diameter of the inlet of the diffuser does not exceed the outer diameter of the inner pipe, a high throughput of the suction nozzle due to the injection effect is ensured.

As a result, during the operation of the proposed device, a positive effect is achieved that exceeds the effect of the prototype. A new set of features of the claimed device, providing a positive effect, has significant differences.

The figure 1 shows the suction nozzle of a pneumatic conveying system, a longitudinal section; figure 2 is a General view of the suction nozzle of the pneumatic conveying installation, figure 3 is the dependence of the throughput of the pneumatic conveying installation when using the developed suction nozzle on the area of the inlet annular gap.

The suction nozzle of the pneumatic conveying system consists of an outer pipe 1, inside of which an inner pipe 2 is coaxially mounted. The suction part of the outer pipe 1 is made in the form of a diffuser 3. The angle of inclination of the walls of the diffuser 3 is 30 °. The diameter d _{1 of the} inlet of the diffuser does not exceed the outer diameter of the inner pipe. The suction nozzle has adjusting bolts 4 to move coaxially relative to the inner pipe 2 and fixation in the required position. The inner pipe 2 is connected to a flexible transport pipe 5.

The suction nozzle of the pneumatic conveying system operates as follows.

After turning on the pneumatic conveying system, the suction nozzle is immersed in a mound of grain. Due to the rarefaction created by the air passing in the space between the inner pipe 2 and the outer pipe 1, the grain is sucked in through the diffuser 3 and fed into the transport pipe 5. The supply of material to the transport pipe 5 is regulated by changing the annular gap H with adjusting bolts 4. Air flow through the annular gap in these options is changed by the displacement of the inner pipe 2 relative to the outer pipe 1 by N.

Tests of the developed device (figure 3) showed that when using a suction nozzle with an angle of inclination of the walls of the diffuser Ψ = 90 °, the maximum throughput of the pneumatic conveying system is 1850 kg / h, and when using a suction nozzle with an angle of inclination of the walls of the diffuser Ψ = 30 °, the throughput pneumatic conveying installation is 2270 kg / h, which is 22.7% higher.

The advantage of the invention in comparison with the prototype is due to its simple design execution, lower unit costs for manufacturing, increased productivity of the pneumatic conveying installation.

Claims (1)

Suction nozzle of a pneumatic conveying system, comprising an outer pipe, an inner pipe coaxially installed inside it, connected to a flexible transport pipe, adjusting bolts for changing the annular gap between the outer and inner pipes by their mutual axial movement, characterized in that the suction part of the outer pipe is made in the form of a diffuser with an angle of inclination of the walls of 30 °, and the diameter of the inlet of the diffuser does not exceed the outer diameter of the inner pipe.

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