Two-fluid spraying device

Abstract

The utility model discloses a two-fluid spraying device which comprises a spraying pipe and a spraying head, the spraying pipe comprises a gas pipe and a material pipe, a material channel and a gas channel which are respectively communicated with the material pipe and the gas pipe are arranged in the spraying head, at least part of the material channel is a plane gap, and the plane gap is used for dispersing materials. The tail section of the gas channel extends towards an outlet of the material channel so as to guide gas to atomize materials at the outlet of the material channel. The two-fluid spraying device disclosed by the utility model is energy-saving and environment-friendly, and is not easy to block.

Description

Technical Field

[0001] The utility model relates to a lithium battery positive electrode material preparation device, in particular to a two-fluid spray device. Background Art

[0002] With the vigorous development of the new energy industry, the demand for lithium batteries is increasing day by day. Lithium iron phosphate batteries have the advantages of long life, safe use, fast charging and discharging, high temperature resistance, and large capacity, and occupy a large proportion in current lithium battery products.

[0003] To prepare lithium iron phosphate, a slurry with a solids content of approximately 38% to 40% is dried into a powder using a spray device. Conventional centrifugal spray drying produces large powder particles. To obtain a smaller powder size, a two-fluid spray method is required. However, typical two-fluid spray guns require high pressure (30-45 bar) to achieve primary atomization of the material, and the nozzles are prone to clogging. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a two-fluid spray device which is energy-saving, environmentally friendly and not prone to clogging.

[0005] Technical solution: The two-fluid spray device described in the utility model includes a nozzle and a nozzle, the nozzle includes a gas pipe and a material pipe, and the nozzle is provided with a material channel and a gas channel respectively connected to the material pipe and the gas pipe, the material channel is at least partially a planar gap, and the planar gap is used to disperse the material, and the end section of the gas channel extends toward the outlet of the material channel to guide the gas to atomize the material at the outlet of the material channel.

[0006] The planar gap can evenly disperse the material. Preferably, the planar gap is the end of the material channel, and the opening of the planar gap is connected to the outside world. Under the action of pressure, the material can be ejected from the opening in an umbrella shape. The above design is different from the traditional porous material outlet and is less likely to cause blockage of the material outlet. After being dispersed by the planar gap, the material is more uniform. After being ejected from the opening, the material is more easily atomized by the gas introduced from the gas channel. This not only reduces the feed pressure and atomization pressure of the two-fluid spray device and reduces its overall energy consumption, but also makes the particle size of the dried material powder smaller, more uniform, and more spherical, thereby improving the performance of the battery.

[0007] The nozzle includes a coaxially arranged fixed pipe, a material distribution plate, a gas-liquid mixing plate and a gas uniform distribution plate; the fixed pipe passes through the material distribution plate, the gas-liquid mixing plate and the gas uniform distribution plate stacked in sequence; the material pipe is connected to the material hole on the material distribution plate, the bottom surface of the material distribution plate and the top surface of the gas-liquid mixing plate form the planar gap, the material hole and the planar gap are connected to form the material channel; the fixed pipe is connected to the gas pipe to form the gas channel. The above structure can achieve uniform distribution of materials and diversion of materials and gases. Preferably, the material distribution plate, the gas-liquid mixing plate and the gas uniform distribution plate are all circular.

[0008] The material distribution tray includes a material guide groove corresponding to the material pipe, a gap is provided between the outlet end of the material pipe and the bottom wall of the material guide groove, and the material hole is provided in the bottom wall of the material guide groove. The number of the material guide groove corresponds to the number of the material pipe. Preferably, the material pipe and the material guide groove are provided in a plurality, and the plurality of material guide grooves do not flow into each other. Optionally, the material guide groove extends along the circumference of the material distribution tray, and each material guide groove is evenly distributed with a plurality of material holes. The gap between the outlet end of the material pipe and the bottom wall of the material guide groove can allow the material to pass through, and the material guide groove can preliminarily evenly distribute the material, thereby ensuring that the material flows out of the material distribution tray evenly, thereby improving the quality of the material powder after drying.

[0009] The two-fluid spray device also includes a sealing cover that covers the gas evenly distributed disk, and the fixed pipe extends to the inner cavity of the sealing cover. The gas evenly distributed disk is provided with air guide holes, and a gap is formed between the top surface of the gas-liquid mixing disk and the bottom surface of the gas evenly distributed disk to allow gas to pass through. The inner cavity of the sealing cover has a certain space. After the gas circulates from the fixed pipe to the inner cavity of the sealing cover, it enters the gap between the top surface of the gas-liquid mixing disk and the bottom surface of the gas evenly distributed disk through the air guide holes on the gas evenly distributed disk, which enables the gas to be evenly dispersed. The above-mentioned gas channel design can improve the stability of the gas output, thereby ensuring the uniformity of the powder particle size. In addition, the fixed pipe can also connect the material distribution disk, the gas-liquid mixing disk, and the gas evenly distributed disk into a whole, making the nozzle structure simpler and more compact. Preferably, a plurality of air guide holes are evenly provided on the gas evenly distributed disk to evenly distribute the gas and improve the consistency of the air pressure at the outlet of the gas channel.

[0010] The edge of the gas distribution disk extends toward the gas-liquid mixing disk to form a guide portion that surrounds the periphery of the gas-liquid mixing disk. A gap is defined between the guide portion and the periphery of the gas-liquid mixing disk. The opening of the gap serves as the outlet of the gas channel, through which gas is discharged to atomize the material.

[0011] The top diameter of the gas-liquid mixing disk is larger than its bottom diameter, forming an inclined surface around its periphery. The guide portion of the gas distribution disk is tilted along this inclined surface. An inclined gap is formed between the inclined periphery of the gas-liquid mixing disk and the inclined guide portion. This inclined gap improves the smoothness of gas flow and further ensures the stability of gas output.

[0012] The nozzle also includes a sealing gasket, which is disposed on a side of the material distribution plate facing the material pipe and is provided with a through hole for the material pipe to pass through. The sealing gasket allows the material to flow only through the material channel and not to flow to other areas, thereby ensuring that the material is evenly distributed.

[0013] The sidewalls of the gas pipe surround the multiple material pipes, which are fixedly connected to the top wall of the gas pipe. The nozzle includes a weight-bearing base for connecting to the nozzle, and the material pipes extend through the top wall of the gas pipe and the weight-bearing base. The gas pipe has a larger diameter than the material pipes, resulting in a larger volume, thus forming a gas storage tank and stabilizing the gas pressure.

[0014] The apparatus also includes a positioning member for mounting the nozzle, the positioning member being connected to the nozzle and having an adjustable position on the nozzle. Optionally, the positioning member is a flange. The outer surface of the sidewall of the gas pipe is provided with a plurality of annular positioning grooves spaced axially therefrom. The flange engages with the corresponding annular positioning grooves to adjust its position on the nozzle. By adjusting the relative position of the positioning member and the nozzle, the distance between the two-fluid spray device and the top of the drying tower can be adjusted.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. The setting of the plane gap can not only evenly disperse the material and improve the particle size uniformity and sphericity of the material powder after drying, but also reduce the required feed pressure and atomization pressure, reduce energy consumption, and is not prone to clogging; 2. The setting of the fixed tube and the gas uniform distribution plate can improve the consistency of the gas pressure, thereby further improving the particle size uniformity of the material after drying; 3. By adjusting the distance from the two-fluid spray device to the top of the drying tower through the positioning piece, the material can be prevented from splashing to the top of the drying tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the present utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 It is an exploded view of the utility model;

[0019] Figure 4It is a partial enlarged schematic diagram of the nozzle;

[0020] Figure 5 is a schematic diagram of a sealing gasket;

[0021] Figure 6 Schematic diagram of the distribution plate;

[0022] Figure 7 Schematic diagram of the gas distribution disk. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 2 As shown, the two-fluid spray device described in the present invention includes a nozzle 1 and a nozzle 2 fixedly connected to one end of the nozzle 1. The nozzle 1 includes a gas pipe 11, a material pipe 12, a positioning member 3 and a weight-bearing seat 13; the side wall of the gas pipe 11 is arranged around the material pipe 12; the four material pipes 12 are evenly arranged around the central axis of the gas pipe 11, and are fixedly connected to the top wall of the gas pipe 11; the outer surface of the side wall of the gas pipe 11 is provided with annular positioning grooves 11a in sequence along the axial direction, and the positioning member 3 is a flange, and the flange and the corresponding annular positioning groove are matched and connected to adjust the distance from the two-fluid spray device to the top of the drying tower. The weight-bearing seat 13 and the air inlet of the gas pipe 11 are relatively arranged at the two ends of the nozzle 1, and the weight-bearing seat 13 is used to connect the nozzle 2, such as Figure 3 As shown, the bearing seat 13 protrudes outwardly from the side wall of the gas pipe 11 in its radial direction and forms a connecting portion. The connecting portion is provided with eight bolt connection holes spaced circumferentially. The bolts pass through the bolt connection holes and are connected to the distribution plate 22. The material pipe 12 and the bolt connection holes both pass through the bearing seat 13.

[0025] like Figures 2 to 4 As shown, the nozzle 2 includes a sealing gasket 26, a material distribution plate 22, a gas-liquid mixing plate 23, a gas uniform distribution plate 24, and a gas sealing cover 25, which are stacked in sequence. It also includes a fixed tube 21 set at the center of the sealing gasket 26, the material distribution plate 22, the gas-liquid mixing plate 23, and the gas uniform distribution plate 24. The fixed tube 21 is connected to the gas pipe 11, and its two ends extend into the bearing seat 13 and the gas sealing cover 25 respectively, and protrude radially outward to form a clamping portion. The clamping portion clamps the sealing gasket 26, the material distribution plate 22, the gas-liquid mixing plate 23, and the gas uniform distribution plate 24 to indirectly achieve a fixed connection with the nozzle 1. The clamping portion is an external hexagonal nut threadedly connected to the two ends of the main body of the fixed tube 21.

[0026] Combine Figure 5As shown, the sealing gasket 26 is made of silicone material and is arranged between the load-bearing seat 13 and the distribution plate 22. A central hole for passing the fixing tube 21 is provided in the center of the sealing gasket 26. Four through holes for the material tube 12 to pass through are provided around the central hole, and eight through holes for the bolts to pass through are located on the periphery. The upper and lower surfaces of the sealing gasket 26 are tightly fitted with the surfaces of the load-bearing seat 13 and the distribution plate 22 respectively, so as to ensure that the material only flows into the corresponding material guide groove 22b on the distribution plate 22 after being guided by the material tube 12, and does not flow to other areas.

[0027] Combine Figure 6 As shown, the center of the material distribution tray 22 is provided with a central hole for inserting the fixing tube 21. Surrounding this central hole, four material guide grooves 22b are provided on one side surface of the material distribution tray 22, as well as five bolt connection grooves located further outward for connecting bolts. The four material guide grooves 22b correspond to the positions of the four material pipes 12, respectively. The four material guide grooves 22b are isolated from each other and do not communicate with each other. A material hole 22a is provided through the bottom of each material guide groove 22b. The outlet end of the material pipe 12 extends into the material guide groove 22b, but there is a gap between the bottom of the material guide groove 22b. This allows the material to flow into the material hole 22a after flowing out of the material pipe 12 outlet, achieving diversion. The material distribution tray 22 is provided with a positioning pin to determine the relative position of the material pipe 12 and the material guide groove 22b.

[0028] like Figure 3 、 Figure 4 As shown, the gas-liquid mixing disk 23 is truncated cone-shaped as a whole, and the diameter of the surface facing the nozzle 1 is larger than the diameter of the surface away from the nozzle 1. The gas-liquid mixing disk 23 includes an abutment portion located in the center and a flow-equalizing portion arranged around the abutment portion. The thickness of the abutment portion is greater than the thickness of the flow-equalizing portion, so that when the two surfaces of the abutment portion abut against the material distribution disk 22 and the gas uniform distribution disk 24 respectively, a gap can be formed between the flow-equalizing portion and the material distribution disk 22 and the gas uniform distribution disk 24. The gaps on both sides allow material and gas to pass through respectively, and are ejected after gas-liquid mixing is achieved at the edge. A center hole for penetrating the fixed pipe 21 is also provided in the center of the abutment portion. The diameter of the surface of the gas-liquid mixing disk 23 facing the nozzle 1 is smaller than the diameter of the surface of the material distribution disk 22 away from the nozzle 1, so that the gas and material are more fully mixed at the edge.

[0029] like Figure 4 and Figure 7As shown, the gas distribution disk 24 is bowl-shaped, that is, the edge of the gas distribution disk 24 extends toward the gas-liquid mixing disk 23, and forms a guide portion 24b that covers the circumference of the gas-liquid mixing disk 23, and the guide portion 24b is tilted outward. The center of the gas distribution disk 24 is provided with a central hole for passing the fixed tube 21, and eight air guide holes 24a are provided around the central hole; the end of the fixed tube 21 extends to the side of the gas distribution disk 24 away from the nozzle 1, so that the gas is evenly distributed on this side through the fixed tube 21. The evenly distributed gas enters the gap between the gas distribution disk 24 and the gas-liquid mixing disk 23 through the air guide holes 24a on the gas distribution disk 24, and finally mixes with the material at the edge of the gas-liquid mixing disk 23. This path makes the air pressure at the edge of the gas-liquid mixing disk 23 consistent, and the particle size of the outlet material is more uniform.

[0030] like Figure 4 As shown, the gas sealing cover 25 covers the side of the gas distribution plate 24 facing away from the nozzle 1. The gas sealing cover 25 forms an inner cavity with a certain space. After the gas flows from the fixed tube 21 to the inner cavity of the gas sealing cover 25, it enters the gap between the top surface of the gas-liquid mixing plate 23 and the bottom surface of the gas distribution plate 24 through the air guide holes 24a on the gas distribution plate 24, thereby further evenly dispersing the gas. The bottom surface of the gas distribution plate 24 has bolt connection grooves, and the gas sealing cover 25 is connected to the gas distribution plate 24 via bolts.

Claims

1. A two-fluid spray device, comprising a nozzle (1) and a nozzle (2), characterized in that: The nozzle comprises a gas pipe (11) and a material pipe (12); a material channel and a gas channel are provided in the nozzle head (2), which are respectively connected to the material pipe (12) and the gas pipe (11); at least a portion of the material channel is a planar gap, and the planar gap is used to disperse the material; the end section of the gas channel extends toward the outlet of the material channel to guide the gas to atomize the material at the outlet of the material channel.

2. The two-fluid spray device according to claim 1, characterized in that: The nozzle (2) comprises a coaxially arranged fixed pipe (21), a material distribution plate (22), a gas-liquid mixing plate (23) and a gas uniform distribution plate (24); the fixed pipe (21) passes through the material distribution plate (22), the gas-liquid mixing plate (23) and the gas uniform distribution plate (24) stacked in sequence; the material pipe (12) is connected to the material hole (22a) on the material distribution plate (22), the bottom surface of the material distribution plate (22) and the top surface of the gas-liquid mixing plate (23) form the plane gap, and the material hole (22a) and the plane gap are connected to form the material channel; the fixed pipe (21) is connected to the gas pipe (11) to form the gas channel.

3. The two-fluid spray device according to claim 2, characterized in that: The material distribution plate (22) includes a material guide groove (22b) corresponding to the material pipe (12), a gap is provided between the outlet end of the material pipe (12) and the bottom wall of the material guide groove (22b), and the material hole (22a) is opened on the bottom wall of the material guide groove (22b).

4. The two-fluid spray device according to claim 2, characterized in that: It also includes a gas sealing cover (25) covering the gas evenly distributing disk (24), the fixed tube (21) extends to the inner cavity of the gas sealing cover (25), the gas evenly distributing disk (24) is provided with a gas guide hole (24a), and a gap allowing gas to pass through is formed between the top surface of the gas-liquid mixing disk (23) and the bottom surface of the gas evenly distributing disk (24).

5. The two-fluid spray device according to claim 2, characterized in that: The edge of the gas uniform distribution disk (24) extends toward the gas-liquid mixing disk (23) to form a guide portion (24b) covering the circumference of the gas-liquid mixing disk (23), and a gap is provided between the guide portion (24b) and the circumference of the gas-liquid mixing disk (23).

6. The two-fluid spray device according to claim 5, characterized in that: The top diameter of the gas-liquid mixing disk (23) is larger than the bottom diameter thereof, so that the peripheral side thereof forms an inclined surface, and the guide portion (24b) of the gas uniform distribution disk (24) is arranged obliquely along the inclined surface.

7. The two-fluid spray device according to claim 2, characterized in that: The nozzle (2) further comprises a sealing gasket (26), which is arranged on a side of the material distribution plate (22) facing the material pipe (12), and a through hole for the material pipe (12) to pass through is provided on the sealing gasket (26).

8. The two-fluid spray device according to claim 1, characterized in that: The side wall of the gas pipe (11) is arranged around the plurality of material pipes (12), and the plurality of material pipes (12) are fixedly connected to the top wall of the gas pipe (11); the nozzle (1) includes a bearing seat (13) for connecting to the nozzle (2), and the material pipe (12) passes through the top wall of the gas pipe (11) and the bearing seat (13).

9. The two-fluid spray device according to claim 1, characterized in that: It also includes a positioning member (3) for installing the nozzle (1), the positioning member (3) is connected to the nozzle (1), and the position of the positioning member (3) on the nozzle (1) is adjustable.

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