Long-distance loss-free conveyor for trace materials

Abstract

The utility model discloses a long-distance loss-free conveyor for trace materials. The long-distance loss-free conveyor comprises an upper shell, a lower shell, a Venturi conveying pipe and an air conveying assembly. And the upper shell and the lower shell are coaxially sealed and detachably connected. The venturi conveying pipe comprises a core rod, a columnar head and a discharging pipe. A material inlet is formed in the center of the core rod, and a plurality of spiral air injection grooves which are equal in length are evenly distributed in the periphery of the top of the core rod in the circumferential direction. An air distribution cavity, a conical cavity and an inner material outlet channel are sequentially distributed in the center of the columnar head from bottom to top. And the air distribution cavity is in sealing fit with the convex part of the core rod. The air conveying assembly comprises a compressed air inlet and an air storage cavity. And the gas storage cavity is formed in the top of the lower shell on the periphery of the core rod and communicates with the bottom of each gas spraying groove, and the top of each gas spraying groove communicates with the conical cavity. The feeding amount and the discharging amount of trace materials can be equal, and long-distance stable conveying within 30 m can be achieved. In addition, negative pressure is formed at the material inlet, and raised dust is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a material conveying device, in particular to a trace material long-distance non-waste conveyor. BACKGROUND

[0002] The trace material mentioned in the application refers to the material with the conveying amount less than 100g / h, such as the additive with small usage amount. In the continuous use of the trace material, the trace material conveying and adding are often involved. The minimum processing capacity of the common material conveying mode on the market is more than 1kg / h. When the usage amount is less than 100g / h, there is a lack of reasonable solution. For example, the vacuum generator with the minimum processing capacity on the market has the following deficiencies when used in the trace material conveying, and needs to be improved:

[0003] 1. Unstable formula: The tail gas filter with the filter core is usually arranged at the end of the vacuum generator. Due to the large conveying air usage amount, the low solid-gas ratio and the fast material conveying speed, on the one hand, the material is easy to stick to the pipe wall, affecting the formula stability; on the other hand, the material is easy to stick to the filter core, thereby seriously affecting the formula stability.

[0004] 2. Short conveying distance: The trace material such as the additive usually needs to be added in different workshops or different production lines. Therefore, in the use process, the conveying distance usually needs to reach more than 10m, or even about 30m. However, the existing vacuum generator is difficult to achieve the conveying distance of more than 5m due to the insufficient conveying side positive pressure. TECHNICAL SOLUTION

[0005] The utility model solves the technical problem of the prior art, and provides a trace material long-distance non-waste conveyor. The trace material long-distance non-waste conveyor can make the feeding amount and the discharging amount of the trace material equal, and can realize the long-distance stable transmission within 30m.

[0006] To solve the above technical problems, the utility model adopts the technical scheme that:

[0007] A trace material long-distance non-waste conveyor, comprising an upper shell, a lower shell, a Venturi conveying pipe and an air conveying assembly.

[0008] The upper shell and the lower shell are coaxially and detachably connected.

[0009] The Venturi conveying pipe is arranged on the central axis of the upper shell and the lower shell, and comprises a core rod, a columnar head and a discharging pipe.

[0010] The core rod is arranged on the central axis of the lower shell and is hollow. The hollow cavity is formed as a material inlet.

[0011] The core rod top protrusion forms a protrusion part, and a plurality of equal-length air jet grooves are uniformly arranged on the outer periphery of the protrusion part in the circumferential direction; wherein each air jet groove is in a spiral type.

[0012] The cylindrical head and the discharge pipe are sequentially arranged on the central axis of the upper shell from bottom to top.

[0013] The center of the cylindrical head is sequentially arranged with an air distribution cavity, a conical cavity and an inner material outlet channel from bottom to top; wherein the inner diameter of the air distribution cavity is greater than the inner diameter of the inner material outlet channel, and the air distribution cavity and the inner material outlet channel are connected and transitioned through the conical cavity; the air distribution cavity is in sealing cooperation with the protrusion part of the core rod.

[0014] The center of the discharge pipe is provided with an outer material outlet channel; the outer material outlet channel and the inner material outlet channel jointly constitute an equal-diameter material outlet.

[0015] The air conveying assembly comprises a compressed air inlet and a gas storage cavity.

[0016] The gas storage cavity is arranged at the top of the lower shell on the outer periphery of the core rod, and is in communication with the bottom of each air jet groove; the top of each air jet groove is in communication with the conical cavity.

[0017] The sum of the cross-sectional areas of all air jet grooves is S, in m 2 ; the calculation formula of S is:

[0018] S = Av * 60 * 1000 / 454 / P0 (293 / T0) 0.5 )

[0019] Wherein:

[0020] P / P0 < 0.528

[0021] In the formula, A is the cross-sectional area of the material outlet, in m 2 .

[0022] V is the gas flow rate at the end of the material outlet, in m / s.

[0023] P0 is the absolute pressure at the compressed air inlet, in Pa.

[0024] T0 is the stagnation temperature of air in the gas storage cavity, in K.

[0025] P is the absolute pressure at the end of the material outlet, in Pa.

[0026] The number of air jet grooves is not less than four.

[0027] The cross-sectional shape of each air jet groove is a square or a semicircle.

[0028] The gas flow velocity v of the material outlet end ranges from 20 to 30 m / s, the absolute pressure P0 of the compressed air inlet ranges from 300000 to 400000 Pa, and the absolute pressure P of the material outlet end is not more than 131 Kpa.

[0029] The length of each air jet groove is 5-8 times of the maximum dimension of the cross-sectional shape interface.

[0030] The spiral lead angle of each air jet groove is 30-50°.

[0031] The gas storage cavity is arranged on the top surface of the lower shell outside the core rod, and the top surface is open, and a sealing assembly capable of sealing the gas storage cavity is arranged outside the gas storage cavity.

[0032] The air conveying assembly further comprises an air communication cavity; wherein the compressed air inlet is horizontally arranged outside the middle part of the columnar head, and the air communication cavity is vertically arranged and used for connecting the compressed air inlet and the gas storage cavity.

[0033] The inner diameters of the material inlet and the material outlet are equal.

[0034] The utility model has the following beneficial effects:

[0035] 1. The speed of the material passing through the discharge pipe is controlled to be 20-30 m / s, and the large positive pressure at the tail end of the discharge pipe, so that the resistance drop of the Venturi conveying rear end is not greater than 30 kPa under the condition that the conveying distance is not greater than 30 m, and stable conveying can be realized.

[0036] 2. Since the speed of the material passing through the discharge pipe is controlled to be 20-30 m / s, stable long-distance conveying can be ensured, and since the speed is small, a small amount of material conveyed at the material point will not be adhered to the filter core of the filter, so that the loss of the small amount of material is further reduced, and there is no material adhesion dead angle, so that the feeding amount and the discharging amount can be equal, and the stability of the formula can be ensured.

[0037] 3. Simple structure, easy to clean.

[0038] 4. Negative pressure at the material inlet, no dust. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A line section view of the utility model discloses a trace material long-distance non-waste conveyor is shown.

[0040] Figure 2 A three-dimensional simulation half-section view of the utility model discloses a trace material long-distance non-waste conveyor is shown.

[0041] Figure 3 A line structure schematic view of the lower shell containing the core rod in the utility model is shown.

[0042] Figure 4 A three-dimensional simulation diagram of the lower shell containing the mandrel in the utility model is shown.

[0043] Figure 5 A three-dimensional simulation half-section view of the lower shell containing the mandrel in the utility model is shown.

[0044] Among them:

[0045] 10. The upper shell;

[0046] 20. The lower shell; 21. The sealing ring; 22. The sealing groove;

[0047] 30. The Venturi conveying pipe;

[0048] 31. The mandrel; 311. The material inlet; 312. The air injection groove;

[0049] 32. The columnar head; 321. The air distribution cavity; 322. The conical cavity; 323. The inner material outlet passage;

[0050] 33. The discharge pipe; 331. The outer material outlet passage;

[0051] 40. The air conveying assembly; 41. The compressed air inlet; 42. The air communication cavity; 43. The air storage cavity. DETAILED DESCRIPTION

[0052] The utility model will be further described in detail below in combination with the drawings and specific preferred embodiments.

[0053] In the description of the utility model, it is 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, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and "first", "second" and the like do not represent the importance of the parts, so it cannot be understood as a limitation on the utility model. The specific size used in the embodiment is only used to illustrate the technical scheme, and does not limit the protection scope of the utility model.

[0054] As Figure 1 and Figure 2 shown, a micro material long-distance lossless conveyor includes an upper shell 10, a lower shell 20, a Venturi conveying pipe 30 and an air conveying assembly 40.

[0055] The upper shell and the lower shell are coaxially sealed and detachably connected, preferably connected through flange threads.

[0056] The Venturi conveying pipe is arranged on the central axis of the upper shell and the lower shell, and includes a core rod 31, a columnar head 32 and a discharge pipe 33.

[0057] As shown in Figure 3 , Figure 4 and Figure 5 , the core rod is preferably arranged integrally on the central axis of the lower shell and is hollow, and the hollow cavity is formed as a material inlet 311, which is preferably connected to a micro material metering device through a pipeline.

[0058] The top of the core rod is protruding, forming a protruding portion, and the outer periphery of the protruding portion is preferably uniformly provided with no less than four equal-length air injection grooves 312; in the embodiment, the number of the air injection grooves 312 is preferably four, and the cross-sectional shape of each air injection groove is preferably square or semicircular, etc., so that the area of the compressed air contacting the parts is minimized as much as possible under the condition of ensuring the flow area, and the viscous resistance of the gas flowing through the place is also minimized.

[0059] Further, each air injection groove is in a spiral shape, and the spiral lead angle of each air injection groove is preferably 30-50°. By such arrangement, the introduced compressed air forms a cyclone-shaped forward airflow, and the rotating airflow does not form adhesion with the inner wall of the material outlet, reducing the loss of micro materials.

[0060] Further, the length of each air injection groove is preferably 5-8 times the maximum dimension of the cross-sectional shape interface, and is as short as possible under the condition of realizing the guiding function. When the cross-sectional shape of the air injection groove is square, the maximum dimension of the interface is the length of the diagonal; when the cross-sectional shape of the air injection groove is semicircular, the maximum dimension of the interface is the diameter.

[0061] The columnar head and the discharge pipe are sequentially arranged on the central axis of the upper shell from bottom to top.

[0062] The center of the columnar head is sequentially arranged with an air distribution cavity 321, a conical cavity 322 and an inner material outlet passage 323 from bottom to top; wherein the inner diameter of the air distribution cavity is larger than the inner diameter of the inner material outlet passage, and is connected and transitioned through the conical cavity; the air distribution cavity is in sealing cooperation with the protruding portion of the core rod.

[0063] The center of the discharge pipe is provided with an outer material outlet passage 331; the outer material outlet passage and the inner material outlet passage jointly constitute an equal-diameter material outlet. Among them, the material outlet is preferably connected to a material end container through a pipeline, and the tail gas is discharged through a filter.

[0064] Further, the inner diameters of the material inlet and the material outlet are preferably equal.

[0065] The air conveying assembly includes a compressed air inlet 41, an air communication cavity 42 and an air storage cavity 43.

[0066] The gas storage cavity is arranged on the top of the lower shell of the core rod, preferably with an open top surface, and a sealing assembly is arranged outside the gas storage cavity to seal the gas storage cavity. The sealing assembly preferably includes a sealing groove 22 arranged on the surface of the lower shell outside the gas storage cavity and a sealing ring 21 embedded in the sealing groove.

[0067] The compressed air inlet is horizontally arranged outside the middle part of the columnar head, and the air communication cavity is vertically arranged to communicate the compressed air inlet and the gas storage cavity. The absolute pressure P0 at the compressed air inlet is preferably in the range of 300000-400000 Pa, and the compressed air inlet is preferably connected to the compressed air through a filter pressure reducing valve.

[0068] The bottom of each jet slot is preferably connected to the gas storage cavity, and the top of each jet slot is connected to the conical cavity.

[0069] The sum of the cross-sectional areas of all jet slots is S, with the unit being m 2 ; and the calculation formula of S is:

[0070] S = Av * 60 * 1000 / 454 / P0 (293 / T0) 0.5 )

[0071] Wherein:

[0072] P / P0 < 0.528

[0073] In the formula, A is the cross-sectional area of the material outlet, with the unit being m 2 .

[0074] v is the gas flow rate at the end of the material outlet, with the unit being m / s.

[0075] P0 is the absolute pressure at the compressed air inlet, with the unit being Pa.

[0076] T0 is the stagnation temperature of air in the gas storage cavity, with the unit being K.

[0077] P is the absolute pressure at the end of the material outlet, with the unit being Pa.

[0078] Since P / P0 < 0.528, the speed of air flowing through the jet slot is sonic flow. By using the Venturi principle, a negative pressure is formed at the starting end of the material inlet of the core rod, and a positive pressure as large as possible is formed at the delivery end of the discharge pipe.

[0079] In this application, by setting the sum S of the cross-sectional areas of all jet slots, the gas flow rate v at the end of the material outlet can be controlled in the range of 20-30 m / s, and the absolute pressure P at the end of the material outlet does not exceed 131 Kpa.

[0080] The working principle of the present application: in the trace material conveying process, the compressed air source pressure is stabilized at 3-4 bar, the jet slot sprays the rotating airflow in the sonic state and forms negative pressure to completely suck the trace material at the material inlet and convey it to the material using point. The material speed through the discharge pipe is controlled at 20-30 m / s, and the tail end of the discharge pipe has larger positive pressure, so that the resistance drop at the Venturi conveying rear end is not greater than 30 kPa under the condition that the conveying distance is not greater than 30 m, and stable conveying can be realized.

[0081] Further, since the material speed through the discharge pipe is controlled at 20-30 m / s, the trace material loss can be further reduced while ensuring stable long-distance conveying, and since the speed is small, the trace material conveyed by the material using point will not adhere to the filter core of the filter, so that the material feeding amount and the material discharging amount can be equalized, and the stability of the formula can be ensured.

[0082] The preferred embodiments of the present application are described in detail above, but the present application is not limited to the specific details in the above embodiments, and various equivalent transformations can be made to the technical solutions of the present application within the technical concept of the present application, and these equivalent transformations all belong to the protection scope of the present application.

Claims

1. A micro-amount material long distance non-loss conveyor, characterized by: The utility model provides a venturi feeder, which comprises an upper shell, a lower shell, a venturi conveying pipe and an air conveying assembly. The upper shell and the lower shell are coaxially and detachably connected. The venturi conveying pipe is arranged on the central axis of the upper shell and the lower shell and comprises a core rod, a columnar head and a discharge pipe. The core rod is arranged on the central axis of the lower shell and is hollow, and a hollow cavity is formed as a material inlet. The top of the core rod is protruded to form a protruded part, and a plurality of equal-length air injection grooves are uniformly arranged on the outer periphery of the protruded part in the circumferential direction. The columnar head and the discharge pipe are sequentially arranged on the central axis of the upper shell from bottom to top. The center of the columnar head is sequentially arranged with an air distribution cavity, a conical cavity and an inner material outlet channel from bottom to top. The inner diameter of the air distribution cavity is larger than that of the inner material outlet channel, and the air distribution cavity and the inner material outlet channel are connected through the conical cavity. The center of the discharge pipe is provided with an outer material outlet channel. The air conveying assembly comprises a compressed air inlet and a gas storage cavity.

2. The micro-dosing long distance lossless conveyor according to claim 1, characterized in that: Let the sum of the cross-sectional areas of all the air injection slots be S, in m2 2 The formula for calculating S is: S = Av * 60 * 1000 / 454 / P0 (293 / T0) 0.5 ) The gas storage cavity is arranged on the top of the lower shell outside the core rod and is in communication with the bottom of each air injection groove. P / P0 < 0.528 where A is the cross-sectional area of the material outlet in m2 2 ; v is the gas flow rate at the end of the material outlet, in m / s. P0 is the absolute pressure at the compressed air inlet, in Pa. T0 is the stagnation temperature of the air in the gas storage cavity, in K. P is the absolute pressure at the end of the material outlet, in Pa.

3. The micro-amount material long distance lossless conveyor according to claim 1 or 2, characterized in that: The number of the air injection grooves is not less than four.

4. The micro-dosing long distance lossless conveyor according to claim 3, characterized in that: The cross-sectional shape of each air injection groove is square or semicircular.

5. The micro-amount material long distance lossless conveyor according to claim 2, characterized in that: The gas flow rate v at the end of the material outlet ranges from 20 to 30 m / s, the absolute pressure P0 at the compressed air inlet ranges from 300000 to 400000 Pa, and the absolute pressure P at the end of the material outlet is not more than 131 Kpa.

6. The micro-dosing long distance lossless conveyor according to claim 1, characterized in that: The length of each air injection groove is 5 to 8 times the maximum dimension of the cross-sectional shape interface.

7. The micro-amount material long distance lossless conveyor according to claim 1 or 6, characterized in that: The helix lead angle of each air injection groove is 30 to 50°.

8. The micro-dosing long distance lossless conveyor according to claim 1, characterized in that: The gas storage cavity is arranged on the top surface of the lower shell outside the core rod, and the top surface is open.

9. The micro-dosing long distance lossless conveyor according to claim 1, characterized in that: The air conveying assembly further comprises an air communication cavity.

10. The micro-dosing long distance lossless conveyor according to claim 1, characterized in that: The inner diameters of the material inlet and the material outlet are equal.

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