Stirrer cooling device for lithium battery negative electrode material production

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a stirrer cooling device for lithium battery cathode material production, which comprises a reaction kettle provided with a stirrer, a manhole arranged in the center of the top of the reaction kettle, a sealing device arranged on the manhole, and an annular cooling cavity arranged on the periphery of the sealing device. A turning observation window is arranged on the upper portion of the sealing device, a speed reducer is arranged on the upper portion of the turning observation window, a motor is arranged on the upper portion of the speed reducer, and a cooling groove wrapping the speed reducer is arranged on the periphery of the speed reducer. One sides of the cooling cavity and the cooling tank are respectively communicated with the inlet oil collecting tank, and the other sides are respectively communicated with the outlet oil collecting tank; a discharging port of the outlet oil collecting groove is communicated with an oil storage tank through a heat exchanger, and the oil storage tank is communicated with the inlet oil collecting groove through an oil pump. According to the sealing device, the problems of sealing leakage and material and environment pollution caused by high-temperature deformation of the sealing device are avoided, and the product quality, the yield and the environment safety are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coal tar deep processing production, concretely relates to a stirrer cooling device for lithium battery negative material production. BACKGROUND

[0002] The negative material is an important component of lithium ion battery, and its material is various, and the common negative material currently includes carbon negative material, tin-based negative material, lithium-containing transition metal nitride negative material, alloy negative material and nanometer negative material; the negative material actually used in lithium ion battery is generally carbon material, such as graphite, soft carbon (such as coke, etc.), hard carbon, etc. The high softening point pitch obtained in the coal tar processing process is a mixture of various mixed aromatic hydrocarbons, and can be used as raw material of suitable lithium battery negative material because of containing rich carbon elements; in the production of processing and preparing lithium battery negative material by using high softening point pitch, the most important thing is that the pitch carries out modification polymerization reaction in the reaction furnace, and the reaction is carried out at high temperature; in the process, the self-heating or heat generated by friction of the stirrer when rotating will cause high-temperature deformation of the mechanical seal between the stirrer and the reaction kettle, thereby causing sealing leakage, material and production environment pollution and other problems, but the existing device does not have the related setting to solve these problems. Therefore, it is necessary to develop corresponding production equipment and production process to solve the above problems. SUMMARY

[0003] The utility model solves the technical problem that: provide a kind of stirrer cooling device for lithium battery negative material production, overcome the mechanical seal between the stirrer and the reaction kettle in the high-temperature production process of lithium battery negative material due to high-temperature deformation and cause sealing leakage, material and production environment pollution and other problems.

[0004] To solve the above technical problems, the technical scheme of the utility model is:

[0005] The utility model provides a kind of agitator cooling device for lithium battery negative material production, including the reaction kettle with agitator, the manhole is equipped in the top center of reaction kettle, the upper surface of manhole is equipped with the sealing device of being sealed with manhole and being wrapped around agitator stirring shaft;Sealing device outer periphery is equipped with annular cooling cavity, the bottom of one side of cooling cavity is equipped with cooling liquid inlet, the top of the other side of cooling cavity is equipped with cooling liquid outlet;The upper portion of sealing device is equipped with the turning gear observation window of being wrapped around stirring shaft, the upper portion of turning gear observation window is equipped with speed reducer, the upper portion of speed reducer is equipped with motor;The outer periphery of speed reducer is equipped with the cooling tank of being wrapped around speed reducer, cooling tank is equipped with annular cooling cavity, the bottom of one side of cooling tank is equipped with cooling liquid inlet, the top of the other side of cooling tank is equipped with cooling liquid outlet;Cooling liquid inlet is respectively communicated to the discharge port of import oil groove by pipeline, and cooling liquid outlet is respectively communicated to the feed port of export oil groove by pipeline;The discharge port of export oil groove is communicated to the feed port of oil storage tank by pipeline and heat exchanger, and the discharge port of oil storage tank is communicated to the feed port of import oil groove by pipeline and oil pump.

[0006] Preferably, the sealing device is a mechanical sealing device.

[0007] Preferably, the bottom of the stirring shaft is provided with double-layer stirring paddles.

[0008] Preferably, the cooling tank is sealingly connected between the upper motor and the lower turning gear observation window.

[0009] Preferably, the cooling liquid inlet and the cooling liquid outlet of the cooling cavity are both provided with two parallel ones. This can increase the flow rate of the cooling liquid, ensuring the cooling effect.

[0010] Preferably, the cooling liquid inlet and the cooling liquid outlet of the cooling tank are both provided with two parallel ones. This can increase the flow rate of the cooling liquid, ensuring the cooling effect.

[0011] Preferably, the pipeline connecting the cooling liquid outlet to the export oil groove is provided with a sight glass.

[0012] Preferably, the pipeline connecting the oil storage tank to the import oil groove is further provided with a reflux pipeline through a reflux valve.

[0013] Preferably, the pipeline connecting the oil storage tank to the import oil groove, the oil pump, the reflux valve and the reflux pipeline are provided with two sets. One set can be used when the other set is stopped, ensuring the continuity of work.

[0014] Preferably, the oil pump is a gear oil pump.

[0015] Thanks to the above technical solutions, the utility model has the following advantages:

[0016] In summary, the utility model discloses a cooling device for the sealing device between the stirring shaft and the reaction kettle and the reducer area of the upper part of the stirring shaft (a large amount of heat is generated at the place, which is conducted to the sealing device through the stirring shaft, and the sealing device is heated) to avoid the sealing leakage of the sealing device due to high temperature deformation and the pollution of materials and production environment, thereby ensuring the product quality, yield and environmental safety. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structural schematic diagram of the utility model;

[0018] Figure 2 is the structural schematic diagram of the reaction kettle of the utility model;

[0019] In the drawing, 1, agitator;2, reaction kettle;3, manhole;4, sealing device;5, turning gear observation window;6, speed reducer;7, motor;8, cooling tank;9, import oil collecting groove;10, export oil collecting groove;11, heat exchanger;12, oil storage tank;13, oil pump;14, scope;15, backflow valve. DETAILED DESCRIPTION

[0020] The utility model is further described below in combination with the drawings and examples.

[0021] Example one

[0022] As Figure 1 and Figure 2 shown, the utility model discloses a kind of agitator cooling device for lithium battery negative electrode material production, including the reaction kettle 2 of being equipped with agitator 1, the top central of reaction kettle 2 is equipped with manhole 3, the upper surface of manhole 3 is equipped with the sealing device 4 of being sealedly connected with manhole 3 and wrapping agitator 1 stirring shaft (not marked), the outer periphery of sealing device is equipped with annular cooling cavity (not marked), the bottom of one side of sealing device 4 is equipped with cooling liquid inlet (not marked), the top of the other side of sealing device 4 is equipped with cooling liquid outlet (not marked);The upper portion of sealing device 4 is equipped with the turning gear observation window 5 of wrapping stirring shaft, the upper portion of turning gear observation window 5 is equipped with speed reducer 6, the upper portion of speed reducer 6 is equipped with motor 7, the outer periphery of speed reducer 6 is equipped with the cooling tank 8 of wrapping speed reducer, the cooling tank 8 is equipped with annular cooling cavity (not marked) in, the bottom of one side of cooling tank 8 is equipped with cooling liquid inlet, the top of the other side of cooling tank 8 is equipped with cooling liquid outlet;Cooling liquid inlet is all respectively communicated to the discharge port of import oil collecting groove 9 by pipeline, and cooling liquid outlet is all respectively communicated to the feed port of export oil collecting groove 10 by pipeline;The discharge port of export oil collecting groove 10 is communicated to the feed port of oil storage tank 12 by pipeline and heat exchanger 11, and the discharge port of oil storage tank 12 is communicated to the feed port of import oil collecting groove 9 by pipeline and oil pump 13.

[0023] The pipes through which the cooling liquid outlet communicates to the outlet oil collecting groove 10 are each provided with a sight glass 14; the pipes through which the oil storage tank 12 communicates to the inlet oil collecting groove 9 are further provided with a backflow pipe (not shown) through a backflow valve 15.

[0024] The actual production process is as follows: the coal tar pitch obtained in the previous process is introduced into the reaction kettle 2 through a pipe; after the feeding is completed, the material in the reaction kettle 2 is subjected to temperature control and heating according to the process requirements, and the temperature is controlled at 350-400℃. Under such a high-temperature environment, the light fraction of the coal tar pitch is gradually distilled to the tail gas recovery system; during the heating and distillation of the reaction kettle, the stirrer continuously operates, and on one hand, it is subjected to the heat generated by the equipment itself, and on the other hand, it is subjected to the impact of the high-temperature light fraction generated under the high-temperature environment of the reaction kettle, which will cause the sealing device 4 at the connection between the stirring shaft and the manhole 3 of the reaction kettle 2 to bear high temperature, and if not treated, it will cause the device to deform and cause leakage and other problems; therefore, cooling treatment needs to be performed on this place, a mechanical sealing device 4 with a cooling cavity is selected, and a cooling tank 8 is also arranged at the upper part of the speed reducer 6 of the stirring shaft to perform cooling, so as to prevent the heat generated by the stirring shaft at the speed reducer 6 from being conducted to the sealing device 4; the sealing device 4 and the adjacent speed reducer 6 are cooled by a high-temperature resistant machine oil recycling system composed of an inlet oil collecting groove 9, an outlet oil collecting groove 10, a heat exchanger 11, an oil storage tank 12 and an oil pump 13, so as to ensure that the sealing device 4 will not appear sealing leakage due to high temperature, material and environmental pollution problems, thereby ensuring the product quality, yield and environmental safety.

[0025] It should be understood that the embodiments are only used for illustrating the present application and are not used for limiting the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims attached to the present application.

Claims

1. A stirrer cooling device for producing a lithium battery negative material, characterized by: The utility model provides a reaction kettle with stirrer, the top of the reaction kettle is provided with a manhole, the upper surface of the manhole is provided with a sealing device for sealing the stirring shaft of the stirrer, the outer periphery of the sealing device is provided with an annular cooling cavity, the bottom of one side of the cooling cavity is provided with a cooling liquid inlet, the top of the other side of the cooling cavity is provided with a cooling liquid outlet, the upper part of the sealing device is provided with a turning gear observation window for wrapping the stirring shaft, the upper part of the turning gear observation window is provided with a speed reducer, the upper part of the speed reducer is provided with a motor, the outer periphery of the speed reducer is provided with a cooling tank for wrapping the speed reducer, the cooling tank is provided with an annular cooling cavity, the bottom of one side of the cooling tank is provided with a cooling liquid inlet, the top of the other side of the cooling tank is provided with a cooling liquid outlet, the cooling liquid inlets are respectively connected to the outlet of the inlet oil collecting groove through pipelines, the cooling liquid outlets are respectively connected to the inlet of the outlet oil collecting groove through pipelines, the outlet of the outlet oil collecting groove is connected to the inlet of the oil storage tank through a pipeline and a heat exchanger, the outlet of the oil storage tank is connected to the inlet of the inlet oil collecting groove through a pipeline and an oil pump.

2. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: The sealing device is a mechanical sealing device.

3. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: The bottom of the stirring shaft is provided with double-layer stirring paddles.

4. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: The cooling tank is sealingly connected between the upper motor and the lower turning gear observation window.

5. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: A sight glass is arranged on the pipeline connecting the cooling liquid outlet to the outlet oil collecting groove.

6. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: A backflow pipeline is arranged on the pipeline connecting the oil storage tank to the inlet oil collecting groove through a backflow valve.

7. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: Two sets of pipelines, an oil pump, a backflow valve and a backflow pipeline are provided.

8. The stirrer cooling device for lithium battery negative material production according to claim 1, characterized in that: The oil pump is a gear oil pump.

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