Radio frequency plasma spheroidizing equipment

Abstract

The utility model discloses radio frequency plasma spheroidizing equipment which comprises a reaction chamber, a lamp box arranged at the top of the reaction chamber and a collecting chamber connected with the reaction chamber, a first water cooling unit is arranged on the reaction chamber and comprises a cooling cylinder arranged on the outer wall of the reaction chamber, and a second water cooling unit is arranged on the outer wall of the cooling cylinder. A cooling pipeline is formed between the inner wall of the cooling cylinder and the outer wall of the reaction chamber, a water inlet is formed in the bottom of the cooling pipeline, and a water outlet is formed in the top of the cooling pipeline. The lamp rectangular seat, the reaction chamber and the reaction chamber material collecting section adopt independent water cooling design, and the V-shaped pipe section and the straight pipe section adopt series water cooling design, so that a formed uniformly-distributed cooling water flow field enables the temperature distribution in the reaction synthesis chamber to be more uniform; different temperature gradients, caused by uneven temperature, of the nano powder at different positions in the cooling and crystallization process are reduced, and the quality of the synthesized nano powder material is further improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of radio frequency plasma spheroidization equipment, and more particularly, to a cooling system for radio frequency plasma spheroidization equipment. Background Art

[0002] Using radio frequency plasma as a heat source offers significant technical advantages in the preparation of nanopowder materials and the spheroidization of micron and submicron powders. Radio frequency plasma is characterized by high temperature, high enthalpy, high activity, and a large temperature gradient. During powder spheroidization, the high-temperature plasma torch reaches temperatures as high as 10,000K. This high temperature environment causes the powder particles to absorb significant heat during combustion, rapidly melting their surfaces. Through the dual effects of rapid air cooling and surface tension, the particles cool and solidify into spherical powders, significantly improving the sphericity of the powder particles and reducing irregular and defective powders.

[0003] However, during the RF plasma spheroidization process, the plasma temperature generated by the equipment is very high (10000K). Especially when using high power or long processing time, this high temperature will damage the equipment itself. In addition, a cooling dead zone will appear in the high-temperature area of ​​the reaction chamber where RF plasma is used to prepare nanopowders. If the temperature in this area is high, the nanoparticle material will produce nanocrystals at a higher temperature and grow to form large grains, resulting in a large number of micron-sized particles agglomerating, and eventually forming micron-sized agglomerates, which will form blocky powders and affect the quality of the processed materials. Subsequent screening will be required. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a radio frequency plasma spheroidization equipment cooling system to cool the reaction chamber, which can effectively reduce the indoor temperature and ensure the stable operation of the equipment and product quality.

[0005] To achieve the above objectives, the present disclosure provides the following technical solutions:

[0006] A radio frequency plasma spheroidization device comprises a reaction chamber, a lamp matrix arranged at the top of the reaction chamber, and a collection chamber connected to the reaction chamber. The reaction chamber is provided with a first water cooling unit, the first water cooling unit comprising a cooling cylinder arranged at the outer wall of the reaction chamber, a cooling pipeline formed between the inner wall of the cooling cylinder and the outer wall of the reaction chamber, a water inlet provided at the bottom of the cooling pipeline and a water outlet provided at the top; the longitudinal cross-sectional width C of the cooling pipeline satisfies the following conditions: ≤C≤mm, and the water pressure in the cooling pipeline is not less than 0.5MPa.

[0007] Furthermore, a material collection section is provided at the bottom of the reaction chamber, and a second water cooling unit is provided on the material collection section. The second water cooling unit has the same structure as the first water cooling unit.

[0008] Furthermore, the lamp matrix is ​​connected to the reaction chamber via a lamp matrix holder, and a third water cooling unit is provided on the lamp matrix holder. The third water cooling unit has the same structure as the first water cooling unit.

[0009] Furthermore, the reaction chamber and the collection chamber are connected through a V-shaped tube, the V-shaped tube includes a V-tube section and a straight tube section, a fourth water-cooling unit is provided on the V-tube section, and a fifth water-cooling unit is provided on the straight tube section, the fourth water-cooling unit and the fifth water-cooling unit are connected in series, and the fourth water-cooling unit and the fifth water-cooling unit have the same structure as the first water-cooling unit.

[0010] Furthermore, an observation chamber for observing the internal operation of the reaction chamber is provided on the top side wall of the reaction chamber.

[0011] In summary, the present disclosure has the following beneficial effects:

[0012] The lamp matrix, reaction chamber, and reaction chamber aggregate section adopt an independent water cooling design, and the V-tube section and straight pipe section adopt a series water cooling design. The uniformly distributed cooling water flow field formed makes the temperature distribution in the reaction synthesis chamber more uniform, reducing the different temperature gradients of nanopowders at different positions during the cooling and crystallization process caused by temperature unevenness, further improving the quality of the synthesized nanopowder materials; and effective water cooling increases the service life of the equipment, the equipment can operate stably for a long time, and realizes batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the radio frequency plasma spheroidization equipment according to an embodiment of the present disclosure.

[0014] Figure 2 This is a cross-sectional view of the water cooling unit structure of an embodiment of the present disclosure.

[0015] Figure 3 Schematic diagram of the water cooling system of the radio frequency plasma spheroidization equipment according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0016] The present disclosure is further described in detail below with reference to the accompanying drawings.

[0017] This specific embodiment is merely an explanation of the present disclosure and is not a limitation of the present disclosure. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0018] To reduce the varying temperature gradients in different nanopowder locations during cooling and crystallization caused by uneven temperatures, the disclosed embodiments employ both independent and cascaded water cooling within the RF plasma spheroidization device to achieve a uniform cooling water flow field. This ensures a consistent temperature gradient between the reaction chamber and the collection chamber, improving the quality of the synthesized nanopowder material. The following detailed structural diagrams illustrate the structure and water cooling principles of the RF plasma spheroidization device.

[0019] See Figure 1 and Figure 2 The radio frequency plasma spheroidization equipment includes a reaction chamber 10, a lamp matrix 20 arranged at the top of the reaction chamber 10, and a collection chamber 30 connected to the reaction chamber 10, wherein the reaction chamber 10 is provided with a first water cooling unit, the first water cooling unit including a cooling cylinder 40 arranged on the outer wall of the reaction chamber, a cooling pipeline 50 is formed between the inner wall of the cooling cylinder 40 and the outer wall of the reaction chamber 10, a water inlet 51 is provided at the bottom of the cooling pipeline, and a water outlet 52 is provided at the top; the longitudinal cross-sectional width C of the cooling pipeline 50 satisfies: 12≤C≤17mm, and the water pressure in the cooling pipeline 50 is not less than 0.5MPa.

[0020] like Figure 1 As shown, a material collecting section 11 is provided at the bottom of the reaction chamber, and a second water cooling unit is provided on the material collecting section 11. The second water cooling unit has the same structure as the first water cooling unit.

[0021] The lamp matrix 20 is connected to the reaction chamber 10 via a lamp matrix holder 21 . A third water cooling unit is provided on the lamp matrix holder 21 . The third water cooling unit has the same structure as the first water cooling unit.

[0022] In some embodiments, the reaction chamber 10 is connected to the collection chamber 30 through a V-shaped tube 60, and the V-shaped tube 60 includes a V-tube section 61 and a straight tube section 62. A fourth water-cooling unit is provided on the V-tube section 61, and a fifth water-cooling unit is provided on the straight tube section 62. The fourth water-cooling unit and the fifth water-cooling unit are connected in series, and the fourth water-cooling unit and the fifth water-cooling unit have the same structure as the first water-cooling unit.

[0023] In the embodiment of the present disclosure, an observation chamber 12 is provided on the top sidewall of the reaction chamber 10 for observing the internal operation of the reaction chamber 10. Furthermore, a camera 13 is provided on the top sidewall of the reaction chamber 10 for observing the operation inside the reaction chamber cavity for a long time.

[0024] The specific steps are:

[0025] Turn on the cooling water system to ensure smooth water flow through the powder spheroidization cavity lamp matrix 21, reaction chamber 10, aggregate section 11, V-tube section 61, and straight tube section 62, i.e., the first water cooling unit, the second water cooling unit, the third water cooling unit, the fourth water cooling unit, and the fifth water cooling unit;

[0026] The lamp matrix 21 (third water cooling unit), the reaction chamber 10 (first water cooling unit), and the aggregate section 11 (second water cooling unit) adopt an independent water cooling design because the inner wall temperature is too high;

[0027] The V-pipe section 61 (fourth water cooling unit) and the straight pipe section 62 (fifth water cooling unit) adopt a series water cooling design;

[0028] The material of radio frequency plasma spheroidization equipment is 304 stainless steel with a wall thickness of 5 to 8 mm;

[0029] After calculating the flow rate, the width C of the cooling pipe (50) is 12-17 mm; the flow pressure of the cooling water in the cooling pipe (50) is above 0.5 MPa;

[0030] The water-cooled reaction chamber is equipped with an observation window and a camera to observe the operation of the reaction chamber cavity for a long time.

[0031] The above description is merely a preferred embodiment of the invention and does not limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention shall be included within the scope of protection of the invention. It is not intended to limit the invention in any form; therefore, any modifications or variations of the invention made within the same spirit of the invention shall still be included within the scope of protection intended by the invention.

Claims

1. A radio frequency plasma spheroidization device, wherein: The invention comprises a reaction chamber (10), a lamp matrix (20) arranged on the top of the reaction chamber (10), and a collection chamber (30) connected to the reaction chamber (10), wherein the reaction chamber (10) is provided with a first water-cooling unit, the first water-cooling unit comprising a cooling cylinder (40) arranged on the outer wall of the reaction chamber, a cooling pipeline (50) is formed between the inner wall of the cooling cylinder (40) and the outer wall of the reaction chamber (10), a water inlet (51) is provided at the bottom of the cooling pipeline, and a water outlet (52) is provided at the top; the longitudinal cross-sectional width C of the cooling pipeline (50) satisfies: 12≤C≤17mm, and the water pressure in the cooling pipeline (50) is not less than 0.5MPa.

2. The radio frequency plasma spheroidization equipment according to claim 1, characterized in that: A material collection section (11) is provided at the bottom of the reaction chamber, and a second water cooling unit is provided on the material collection section (11). The second water cooling unit has the same structure as the first water cooling unit.

3. The radio frequency plasma spheroidization equipment according to claim 1, characterized in that: The lamp matrix (20) is connected to the reaction chamber (10) via a lamp matrix base (21); a third water cooling unit is provided on the lamp matrix base (21); and the third water cooling unit has the same structure as the first water cooling unit.

4. The radio frequency plasma spheroidization equipment according to any one of claims 1 to 3, characterized in that: The reaction chamber (10) is connected to the collection chamber (30) via a V-shaped tube (60). The V-shaped tube (60) includes a V-tube section (61) and a straight tube section (62). A fourth water-cooling unit is provided on the V-tube section (61), and a fifth water-cooling unit is provided on the straight tube section (62). The fourth water-cooling unit and the fifth water-cooling unit are connected in series, and the fourth water-cooling unit and the fifth water-cooling unit have the same structure as the first water-cooling unit.

5. The radio frequency plasma spheroidization equipment according to claim 4, characterized in that: An observation chamber (12) for observing the internal operation of the reaction chamber (10) is provided on the top side wall of the reaction chamber (10).

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