CN217707951U - Venturi equipment for pneumatic conveying of solid particles and powder - Google Patents
Venturi equipment for pneumatic conveying of solid particles and powder Download PDFInfo
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- CN217707951U CN217707951U CN202221844879.4U CN202221844879U CN217707951U CN 217707951 U CN217707951 U CN 217707951U CN 202221844879 U CN202221844879 U CN 202221844879U CN 217707951 U CN217707951 U CN 217707951U
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Abstract
The utility model discloses a Venturi device for pneumatic conveying of solid particles and powder, which comprises a Laval nozzle, a Venturi shell and a ceramic section; the venturi shell is provided with an air inlet and a discharge port which are positioned on the same axis; the air inlet end of the Laval nozzle is connected with a compressed air source, and the air outlet end of the Laval nozzle coaxially penetrates through the air inlet of the Venturi shell and is distributed towards the discharge hole of the Venturi shell; the distance between the gas outlet end of the laval nozzle and the discharge hole can be adjusted; the ceramic section is coaxially arranged on the side wall of the Venturi shell outside the discharge port; the inner wall of the ceramic section is sequentially provided with a negative pressure contraction section and an expansion conveying section along the material conveying direction. The application adopts compressed air as a power source; accelerating the compressed air to supersonic speed by using a Laval nozzle to form a negative pressure area and sucking the materials into a material-gas mixing area; and the distance between the Laval nozzle and the ceramic section is adjusted, so that the solid material can realize the maximum conveying capacity, and the energy utilization rate is improved to the highest.
Description
Technical Field
The utility model relates to a solid particle carries technical field, especially a solid particle and powder air conveying uses venturi equipment.
Background
In the pneumatic conveying process of particles and powder, the materials are often conveyed from A to B in a negative pressure material suction or positive pressure rotary valve mode.
The negative pressure material suction adopts a vacuum pump as a power source, a conveying capacity adjusting mechanism is arranged at a starting point, a filtering device and a negative pressure container are arranged at a tail end, batch conveying is carried out, materials in the negative pressure container cannot be put to a conveying end point during conveying, and negative pressure conveying cannot be carried out during discharging. The negative pressure suction material can cause the following problems in the using process:
1. batch intermittent delivery and poor energy utilization rate.
2. The conveying tail end equipment is more, the cost is high, the occupied space is large, and the cleaning is difficult.
3. The negative pressure system has small air density, small available pressure difference and limited conveying distance.
The positive pressure conveying adopts a positive pressure fan or compressed air as a power source, and a rotary valve with an air locking function is adopted at the conveying starting point to convey materials into a positive pressure area to convey the materials to the conveying tail end by using the pressure of air. Positive pressure rotary valve delivery can cause the following problems during use:
1. the rotary valve is complex in structure and difficult to clean.
2. The requirements on materials are strict, and the materials with stronger abrasion shape are difficult to process.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a venturi device for pneumatic conveying of solid particles and powder, which adopts compressed air as a power source; accelerating the compressed air to supersonic speed by using a Laval nozzle to form a negative pressure area and sucking the materials into a material-gas mixing area; and the distance between the Laval nozzle and the ceramic section is adjusted, so that the solid material can realize the maximum conveying capacity, and the energy utilization rate is improved to the maximum.
In order to solve the technical problem, the utility model discloses a technical scheme is:
a venturi apparatus for pneumatic conveying of solid particles and powder comprises a Laval nozzle, a venturi housing and a ceramic segment.
The venturi shell is provided with an air inlet and a discharge hole which are positioned on the same axis.
The air inlet end of the Laval nozzle is connected with a compressed air source, and the air outlet end of the Laval nozzle coaxially penetrates through the air inlet of the Venturi shell and is distributed towards the discharge hole of the Venturi shell; the distance between the discharge end and the discharge hole of the Laval nozzle can be adjusted.
The ceramic section is coaxially arranged on the side wall of the Venturi shell outside the discharge port.
The inner wall of the ceramic section is sequentially provided with a negative pressure contraction section and an expansion conveying section along the material conveying direction.
And (3) setting an included angle theta =9 degrees between the expansion conveying section and the central axis of the ceramic section, wherein the ceramic throat part is arranged at the joint of the expansion conveying section and the negative pressure contraction section.
The Laval nozzle comprises a straight cylinder section and a conical head which are arranged in sequence along the gas spraying direction; the inner wall of the conical head comprises a primary contraction section, a secondary contraction section, a jet throat part and an expansion section which are sequentially arranged along the gas jet direction.
The axial position of the inner guide piece is fixed, the air inlet end of the inner guide piece is connected with a compressed air source, and the air outlet end of the inner guide piece is coaxially and hermetically inserted into the air inlet end of the Laval nozzle; the laval nozzle can be connected and locked in a sealing sliding way along the outer wall surface of the inner guide piece.
A straight cylinder outer guide section is arranged outside the air inlet of the dune inner shell; the outer guide section of the straight cylinder is coaxially sleeved on the periphery of the straight cylinder section in the Laval nozzle.
The utility model discloses following beneficial effect has:
1. the utility model discloses a compressed air is as the power supply, and is simple easy in the mill.
2. The utility model discloses a wear-resisting pottery and solid material contact have effectively improved the wearability of equipment, make conveying equipment adapt to various materials more extensively.
3. The utility model discloses part is small in quantity, and the size is less, simple structure, and each spare part easy dismouting, easily wash.
Drawings
Fig. 1 shows a schematic structural diagram of the venturi device for pneumatic conveying of solid particles and powder according to the present invention.
Fig. 2 shows an enlarged schematic view of the circled area in fig. 1.
Among them are:
1. an inner guide; 11. an outer limit shaft shoulder; 12.O-shaped rings;
2. a laval nozzle; 21. a straight cylinder section;
22. a conical spray head; 221. a primary contraction section; 222. a secondary contraction section; 223. a spray throat; 224. an expansion section;
23. a flange plate; 24. a screw; 25. adjusting the nut;
3. a venturi housing; 31. a straight cylinder outer guide section; 32. a discharge port;
4. a ceramic segment; 41. a negative pressure contraction section; 42. expanding the delivery segment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second" and the like do not indicate the degree of importance of the component parts, and thus, are not to be construed as limiting the present invention. The specific dimensions used in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in fig. 1 and 2, a venturi apparatus for pneumatic conveying of solid particles and powder includes an inner guide 1, a laval nozzle 2, a venturi housing 3, and a ceramic segment 4.
The venturi housing is provided with an air inlet and a discharge outlet 32 which are located on the same axis.
The air inlet end of the Laval nozzle is connected with a compressed air source, and the air outlet end of the Laval nozzle coaxially penetrates through the air inlet of the Venturi shell and is distributed towards the discharge hole of the Venturi shell.
The laval nozzle comprises a straight barrel section 21 and a conical head 22 arranged in sequence in the gas injection direction.
The inner wall of the conical head comprises a primary contraction section 221, a secondary contraction section 222, an injection throat 223 and an expansion section 224 which are arranged in sequence along the gas injection direction.
And if the diameter of the injection throat part is phi A and the maximum diameter of the expansion section is phi B, determining the ratio of phi B to phi A according to the gas injection speed of the gas outlet end of the Laval nozzle. In the present embodiment, the gas ejection velocity at the gas outlet of the laval nozzle is preferably 1.2 to 2 mach.
The distance between end and the discharge gate are given vent to anger to the laval nozzle can be adjusted, and the regulative mode is prior art, and in this embodiment, preferred regulative mode is:
the axial position of the inner guide piece is fixed, the air inlet end of the inner guide piece is connected with a compressed air source, and the air outlet end of the inner guide piece is coaxially and hermetically inserted into the air inlet end of the Laval nozzle. The front end of interior guide (also deviating from the one end of laval nozzle promptly) is provided with outer spacing shaft shoulder 11, can carry on spacingly to the biggest axial displacement in left side of laval nozzle. An O-ring 12 is preferably provided between the inner guide and the laval nozzle.
A straight cylinder outer guide section 31 is arranged outside the air inlet of the dune inner shell; the straight cylinder outer guide section is coaxially sleeved on the periphery of the straight cylinder section in the Laval nozzle.
The laval nozzle can slide along the outer wall surface of the inner guide piece and the inner wall surface of the straight cylinder outer guide section in a sealing way.
Furthermore, the air inlet end of the straight cylinder outer guide section and the outer side of the air inlet end of the laval nozzle are preferably provided with flange plates 23, and the two flange plates are preferably locked after the axial sliding of the laval nozzle through screws 24 and adjusting nuts 25.
The ceramic section is coaxially arranged on the side wall of the Venturi shell outside the discharge port.
The inner wall of the ceramic section is sequentially provided with a negative pressure contraction section 41 and an expansion conveying section 42 along the material conveying direction.
Setting an included angle between the central axes of the expansion conveying section and the ceramic section as theta, and setting a ceramic throat part at the joint of the expansion conveying section and the negative pressure contraction section; by adjusting θ, the outermost gas jet of the laval nozzle can be made to pass entirely through the ceramic throat.
In the present invention, θ is also called as plantt-meier angle, and is also obtained by looking up the gas dynamic function table for the included angle between the trajectory of the outermost end of the air flow and the axis at the corresponding gas injection speed.
A venturi device conveying method based on solid particle and powder pneumatic conveying comprises the following steps.
Step 1, determining the gas jet velocity V, preferably Mach 1.2 to Mach 2.
Step 2, determining the size of the Laval nozzle: and (3) determining the diameter phi A of the injection throat part in the Laval nozzle and the maximum diameter phi B of the expansion section according to the gas injection speed V determined in the step (1).
In the present embodiment, the gas injection speed is preferably mach 1.4 in V = and the sectional area at Φ B is preferably 1.1 times the sectional area at Φ a.
Step 3, determining theta: theta is an included angle between the expanding and conveying section and the central axis of the ceramic section in the ceramic section, and theta is determined according to the gas jet speed V and the maximum diameter phi B of the expanding section, so that the outmost gas jet flow of the Laval nozzle completely passes through the ceramic throat part, and in the embodiment, theta =9 ° when V =1.4 Mach.
Step 4, adjusting the distance C for the first time: the area corresponding to the negative pressure contraction section in the ceramic section is a negative pressure area, and the area where the expansion conveying section is connected with the negative pressure contraction section is a supersonic speed material-gas mixing area; the area corresponding to the expansion conveying section is a material-gas mixture expansion deceleration area; the distance C is the distance from the air outlet end of the Laval nozzle to the negative pressure contraction section; and (3) adjusting the distance between the air outlet end and the discharge hole of the Laval nozzle for the first time according to the gas injection speed V and the type and the quality of the solid material in the Venturi shell, and further adjusting the distance C.
Step 5, adjusting the distance C again: starting a compressed air source to test and convey the solid materials; and axially moving the Laval nozzle to adjust the distance C, and taking the value of the distance C corresponding to the maximum solid material conveying capacity as the optimal distance C on the premise of no blockage of the solid materials.
Step 6, conveying solid materials: at the optimal distance C, fixing the axial position of the Laval nozzle; compressed air is sprayed to a supersonic speed material gas mixing area at supersonic speed after passing through a conical spray head of a Laval nozzle, and a negative pressure area is formed in a negative pressure contraction section in a ceramic section; the solid material in the Venturi shell enters a supersonic speed material-gas mixing zone under the negative pressure action of the negative pressure zone to mix and accelerate the material and the gas; then, the accelerated material gas mixture is decelerated to the normal speed of pneumatic transmission in the material gas mixture expansion deceleration area and is transmitted to the end container through the ceramic section.
The above detailed description describes the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention to perform various equivalent transformations, which all belong to the protection scope of the present invention.
Claims (5)
1. The utility model provides a solid particle and powder air conveying are with venturi equipment which characterized in that: comprises a Laval nozzle, a Venturi shell and a ceramic section;
the venturi shell is provided with an air inlet and a discharge port which are positioned on the same axis;
the air inlet end of the Laval nozzle is connected with a compressed air source, and the air outlet end of the Laval nozzle coaxially penetrates through the air inlet of the Venturi shell and is distributed towards the discharge hole of the Venturi shell; the distance between the gas outlet end of the laval nozzle and the discharge hole can be adjusted;
the ceramic section is coaxially arranged on the side wall of the Venturi shell outside the discharge port;
the inner wall of the ceramic section is sequentially provided with a negative pressure contraction section and an expansion conveying section along the material conveying direction.
2. The venturi apparatus for the pneumatic conveyance of solid particulates and powders according to claim 1, wherein: and setting an included angle between the expansion conveying section and the central axis of the ceramic section as theta =9 degrees, wherein the ceramic throat part is arranged at the joint of the expansion conveying section and the negative pressure contraction section.
3. The venturi apparatus for pneumatic conveying of solid particles and powders according to claim 1, wherein: the Laval nozzle comprises a straight cylinder section and a conical head which are arranged in sequence along the gas spraying direction; the inner wall of the conical head part comprises a primary contraction section, a secondary contraction section, a spraying throat part and an expansion section which are sequentially arranged along the gas spraying direction.
4. The venturi apparatus for pneumatic conveying of solid particles and powders according to claim 3, wherein: the axial position of the inner guide piece is fixed, the air inlet end of the inner guide piece is connected with a compressed air source, and the air outlet end of the inner guide piece is coaxially and hermetically inserted into the air inlet end of the Laval nozzle; the laval nozzle can be connected and locked in a sealing sliding way along the outer wall surface of the inner guide piece.
5. The venturi apparatus for pneumatic conveying of solid particles and powders according to claim 4, wherein: a straight cylinder outer guide section is arranged outside the air inlet of the dune inner shell; the straight cylinder outer guide section is coaxially sleeved on the periphery of the straight cylinder section in the Laval nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221844879.4U CN217707951U (en) | 2022-07-18 | 2022-07-18 | Venturi equipment for pneumatic conveying of solid particles and powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221844879.4U CN217707951U (en) | 2022-07-18 | 2022-07-18 | Venturi equipment for pneumatic conveying of solid particles and powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217707951U true CN217707951U (en) | 2022-11-01 |
Family
ID=83778499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221844879.4U Active CN217707951U (en) | 2022-07-18 | 2022-07-18 | Venturi equipment for pneumatic conveying of solid particles and powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217707951U (en) |
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2022
- 2022-07-18 CN CN202221844879.4U patent/CN217707951U/en active Active
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