CN201322011Y - Pneumatic conveying pump for powder materials - Google Patents

Abstract

The pneumatic conveying pump for powder materials of the utility model is the core component of powder material conveying, including a feed cavity, a mixing cavity for gas-solid mixing, a discharge cavity for outputting gas-solid mixed powder materials, and an airflow port for introducing airflow for gas-solid mixing. The mixing cavity is a spherical cavity, and the intersection line of the discharge cavity and the spherical cavity is on the same plane. The plane cuts the spherical cavity and the feed cavity and shrinks to a point in the feeding direction. The ideal three-dimensional geometric shape of this strong turbulent vortex airflow maximizes the dispersion efficiency of the powder, and since there are no protrusions or gaps in the spherical cavity that hinder gas-solid mixing, it will not cause the accumulation of powder materials, which is conducive to mixing and easy to clean.

Description

A pneumatic conveying pump for powder materials

technical field

The utility model relates to powder paint coating, construction, chemical industry, light industry, metallurgy and other industries, in particular to a gas-solid injector used for powder transportation, which is the core component of powder material transportation.

Background technique

The powder material pneumatic conveying pump is the key component of the powder supply system for electrostatic powder spraying. Gas homogenization compensation and other steps, and finally the powder coating is delivered to the electrostatic powder spray gun, charged with electrostatic charge by corona discharge or friction electrification, and then deposited on the surface of the workpiece under the action of the electrostatic field to complete the spraying process.

Electrostatic powder spray guns have strict requirements on the stability of powder gas dispersion flow and powder concentration of powder coatings, and the delivery pump is required to meet the following technical requirements:

1. Continuous, uniform and stable powder supply;

2. The amount of powder supply can be adjusted within a certain range;

3. During the powder supply process, there will be no powder mist, delivery, etc.;

4. Easy to assemble and disassemble, easy to clean.

Therefore, the powder material pneumatic conveying pump must convey powder at a constant and uniform rate, and be easy to disassemble and clean. Domestic and foreign counterparts have carried out unremitting research and development and improvement in this area. However, the defects of powder spit, low powder volume, uneven mixing of powder and gas, and collision agglomeration cannot be completely overcome at present.

Utility model content

Aiming at the above defects existing in the prior art, the applicant proposes the utility model through theoretical analysis and repeated experiments. The purpose of the utility model is to provide a longitudinal axial-suction pneumatic conveying pump with special geometric Powder and granular materials with different performances are conveyed.

The utility model is achieved through the following technical solutions:

A pneumatic conveying pump for powder materials, comprising a feeding inner chamber for sucking powder materials, a mixing chamber for gas-solid mixing, a discharge inner chamber for outputting gas-solid mixed powder materials, and an airflow port for introducing airflow for gas-solid mixing, The mixing chamber is a spherical chamber, and the intersecting line between the discharge chamber and the spherical chamber is on a plane, and the plane cuts the spherical chamber and the feeding chamber, and shrinks to a point in the feeding direction. The ideal three-dimensional geometry of this strong turbulent swirling airflow maximizes the dispersion efficiency of powder. Moreover, there are no protrusions or gaps in the spherical cavity that hinder gas-solid mixing, and will not cause powder materials to accumulate, which is not only conducive to mixing, but also easy to clean.

According to an embodiment of the present utility model, the feeding inner cavity has a cylindrical wall surface, and the spherical cavity is tangent to the cylindrical surface of the feeding inner cavity.

According to another embodiment of the present utility model, the discharge lumen has a Venturi inner tube and a Venturi outer tube, the Venturi inner tube is placed inside the Venturi outer tube, and there is an annular gap between them.

According to yet another embodiment of the present utility model, the outer Venturi tube has four dispersing holes evenly distributed around the circumference, and the air flow enters the annular gap through the dispersing holes.

According to yet another embodiment of the present utility model, the upper part of the discharge inner cavity is provided with a secondary airflow port, and the lower part of the secondary airflow port is provided with a 40° annular groove, and the secondary airflow enters the secondary airflow port from the secondary airflow port. After the pneumatic conveying pump is passed through the annular groove, it enters the annular air pressure chamber between the Venturi outer tube and the discharge inner chamber.

According to another embodiment of the present utility model, the pneumatic conveying pump is also provided with a primary airflow port leading to the spherical cavity and a nozzle, and the primary airflow enters the pneumatic conveying pump through the primary airflow port and enters through the nozzle. The spherical cavity, the nozzle inlet is a tapered section.

According to another embodiment of the present utility model, the outlet of the nozzle is provided with an expansion angle.

According to another embodiment of the present utility model, the Venturi outer tube and the Venturi inner tube are fixed on the pneumatic conveying pump through nuts, and the nut is screw-fitted to the pneumatic conveying pump, and the Venturi outer tube has a circle The annular protrusion is stuck on the nut and is fixed by the nut.

According to another embodiment of the present utility model, the inner wall of the end of the Venturi inner tube close to the spherical cavity has rounded corners.

The pneumatic conveying pump of the utility model can adjust the geometric figure size of the sprayed powder to the greatest extent, and can ensure that the air gap is evenly distributed, and the powder material has no dead corners and gaps where the powder is accumulated in the pump body, and the powder dispersion and atomization are improved to the greatest extent. It can increase the airflow to push the powder movement, prevent the pulsation of powder delivery, and improve the dispersion efficiency of powder to the greatest extent.

Description of drawings

Fig. 1 is the structural representation of the pneumatic conveying pump of the present utility model;

Fig. 2 is a structural schematic diagram of the internal cavity of the pneumatic conveying pump shown in Fig. 1;

Fig. 3 is a left side view of the pneumatic conveying pump shown in Fig. 1 .

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 1 for the specific structure of the pneumatic conveying pump according to the utility model. As shown in the figure, the shell 1 is L-shaped as a whole, and has a feeding inner cavity 9 for sucking powder materials, a mixing cavity (spherical cavity 2) for gas-solid mixing, a hollow nozzle 7 for introducing primary airflow for gas-solid mixing, and The discharge lumen 20 of the venturi outer tube 5 and the venturi inner tube 6 for secondary gas mixing is accommodated. The primary airflow performs the first gas-solid mixing on the powder material entering through the feeding inner cavity 9, and the secondary airflow fully mixes the gas-solid mixed powder material located in the discharging inner cavity 20 to improve the dispersion and atomization of the powder.

FIG. 2 shows the cavity structure inside the casing 1 . The main innovation of the utility model lies in the structural arrangement of the spherical cavity 2 . The spherical cavity 2 is a spherical cavity in the shell 1 , the center of which deviates from the axis of the discharge inner cavity 20 . This spherical cavity 2 is tangent to the cylindrical surface of the feed cavity 9 . The intersecting line between the discharge inner cavity 20 and the spherical cavity 2 is on a plane. This plane is reduced to a point A in the feed direction by an inclined plane 30 . The utility model provides an ideal three-dimensional geometric shape of a high-speed airflow impact and a strong turbulent swirl airflow, which maximizes the dispersion efficiency of the powder.

Referring to FIG. 2 , the feeding cavity 9 is a hollow cylindrical surface at the bottom of the housing 1 . The powder material enters the pneumatic conveying pump of the present invention from the feeding inner chamber 9, as shown by the dotted arrow in Fig. 1 . Since the feeding inner cavity 9 is tangent to the spherical cavity 2 , there are no dead corners and gaps where powder is accumulated during the process of the powder material entering the feeding inner cavity 9 to the spherical cavity 2 .

The air path structure of the primary air flow is shown in FIG. 1 . The housing 1 has two primary air flow ports 11 through which the primary air flow enters the pump body, as shown by the dotted arrow in FIG. 1 . The outlet of the primary air flow adopts a tapered hollow nozzle 7, and a certain expansion angle is set at the outlet of the nozzle 7, which can form an ideal divergent air flow; a tapered straight column section is set at the entrance of the nozzle 7, which can eliminate the occurrence of small changes in the state of the inlet air flow to normal work. The impact of improving the relative stability of the actual operation.

The tapered hollow nozzle 7 is adopted, which is easy to manufacture, and when there is deviation in the air flow state at the inlet, it has little influence on the normal work.

The structure of the secondary air flow path is shown in Fig. 1 and Fig. 3 . The shell 1 has a secondary air port 22 leading to the discharge inner cavity 20, through which the secondary air enters the pump body, as shown by the dotted arrow in FIG. 1 . A Venturi outer tube 5 and a Venturi inner tube 6 are arranged in the discharge inner cavity 20 , and both are fixed in the discharge inner cavity 20 with nuts 18 . The Venturi inner tube 6 is placed inside the Venturi outer tube 5 with an annular gap 56 therebetween.

A section of 40° annular groove 3 is provided below the secondary air port 22 in the pump body (see FIG. 3 ). As shown by the dashed arrow in Figure 1, after the secondary air enters the pump body from the secondary air port 22, it passes through the annular groove 3 and fills the annular air pressure chamber between the Venturi outer tube 5 and the discharge inner cavity 20, and then Through the four dispersing holes 4 evenly distributed on the Venturi outer tube 5, it enters the annular gap 56 between the Venturi outer tube 5 and the Venturi inner tube 6, and thus enters the powder delivery pipe 19 after mixing and pressurization. This solution maximizes the size of the geometric figure of the sprayed powder, ensures uniform distribution of the air gap, and improves the dispersion and atomization of the powder to the greatest extent, increases the airflow that promotes the movement of the powder, and prevents the phenomenon of powder delivery pulsation.

Claims (9)

1. powder material strength transfer pump, comprise the discharging inner chamber of the powder material that the charging inner chamber that sucks powder material, the mixing chamber that carries out the gas-solid mixing, output gas-solid mix and import air-flow and carry out the air flow mouth that gas-solid mixes, it is characterized in that, described mixing chamber is the sphere chamber, the intersecting line in described discharging inner chamber and this sphere chamber in one plane, this flush cut sphere chamber and charging inner chamber are punctured into a point on feedstock direction.

2. strength transfer pump as claimed in claim 1 is characterized in that described charging inner chamber has the wall of cylndrical surface, and described sphere chamber and charging inner chamber cylinder are tangent.

3. strength transfer pump as claimed in claim 1 is characterized in that, has pipe and Wen's outer tube in the Wen in the described discharging inner chamber, and pipe places Wen's outer tube inside in the described Wen, has the annulus between the two.

4. strength transfer pump as claimed in claim 3 is characterized in that, described Wen's outer tube has four equally distributed dispersion hole of circumference, and air communication is crossed dispersion hole and entered the annulus.

5. strength transfer pump as claimed in claim 3, it is characterized in that, described discharging inner chamber top has the secondary gas flow mouth, this secondary gas flow mouth bottom have 40 ° circular groove, secondary gas flow enters behind the described strength transfer pump through this circular groove from the secondary gas flow mouth and enters into annular atmospheric pressure cavity between Wen's outer tube and the discharging inner chamber.

6. strength transfer pump as claimed in claim 1, it is characterized in that, described strength transfer pump also has air flow mouth and the nozzle that leads to described sphere chamber, one time air-flow enters described strength transfer pump by an air flow mouth, enter described sphere chamber by described nozzle, described nozzle entrance is a converging transition.

7. strength transfer pump as claimed in claim 6 is characterized in that described jet expansion is provided with divergence cone angle.

8. strength transfer pump as claimed in claim 3, it is characterized in that pipe is fixed on the strength transfer pump by nut in described Wen's outer tube and the Wen, described nut spiral is matched with described strength transfer pump, Wen's outside pipe has a circle annular protrusion, is stuck on the nut and is fixed by nut.

9. strength transfer pump as claimed in claim 3 is characterized in that, pipe has fillet near the inwall of an end in sphere chamber in the described Wen.

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