A continuous feed device for the melt crystallization of 2-cyanopyridine

Abstract

The utility model discloses a kind of for 2-cyanopyridine melt crystallization's continuous feeding device, it is related to chemical raw material conveying technical field.The utility model includes screw conveying component and water cooling component, and screw conveying component is equipped with auger screw in conveying pipe to realize material conveying;Water cooling sleeve of water cooling component is sleeved in conveying pipe outside, and multiple water injection heads are equipped with water injection pipe on its upper, and multiple sponge pipe sleeves are axially sleeved outside conveying pipe;Cooling water is sprayed on sponge pipe sleeve, and conveying pipe is cooled by evaporative heat absorption.The utility model combines continuous conveying with efficient evaporation cooling, can effectively prevent 2-cyanopyridine from melting due to temperature rise in conveying process, ensure the continuity of feeding and the stability of material state, provide reliable guarantee for subsequent crystallization process.

Description

Technical Field

[0001] This utility model belongs to the field of chemical raw material conveying technology, and in particular relates to a continuous feeding device for 2-cyanopyridine melt crystallization. Background Technology

[0002] In the melt crystallization process of 2-cyanopyridine, its powdered raw material needs to be continuously and stably transported to the crystallizer. This material is extremely sensitive to temperature. If the temperature rises above its melting point due to friction or ambient temperature during transportation, it will melt prematurely, causing the material to adhere to, clump, or even block the inner wall of the pipe. This seriously affects the continuity of feeding and the accuracy of metering, and may interfere with the purity and yield of subsequent crystallization processes. Traditional screw conveyors usually only have a conveying function and lack online temperature control capabilities for such heat-sensitive materials. The method of adding an external cooling jacket is difficult to achieve rapid and uniform cooling due to insufficient contact between the heat transfer medium and the conveying pipe wall and limited heat exchange efficiency. Existing technologies cannot effectively maintain the material at a safe low temperature throughout the entire process while continuously conveying it.

[0003] To address these issues, we provide a continuous feeding device for the melt crystallization of 2-cyanopyridine. Utility Model Content

[0004] The purpose of this invention is to provide a continuous feeding device for the melting and crystallization of 2-cyanopyridine. A water-cooled sleeve is fitted over the outside of the screw conveyor assembly, and a water injection pipe is installed above the sleeve. A set of water injection heads are axially arrayed on the lower end face of the water injection pipe, penetrating the water-cooled sleeve. A set of sponge tube sleeves are axially arrayed on the outer wall of the conveying pipe of the screw conveyor assembly. During the crystallization of 2-cyanopyridine, the storage tank is connected to the feed pipe head at one end of the conveying pipe, allowing the coarse 2-cyanopyridine powder to enter the conveying pipe. The screw in the conveying pipe rotates and pushes the coarse powder forward. Simultaneously, cooling water is injected into each water injection head through the water injection pipe. The cooling water is sprayed from the water injection head onto the sponge tube sleeves, which absorb and store the cooling water, keeping the temperature inside the conveying pipe below 20 degrees Celsius to prevent the 2-cyanopyridine from melting due to heat during the feeding process.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a continuous feeding device for the melting and crystallization of 2-cyanopyridine, comprising a screw conveying assembly and a water cooling assembly. The screw conveying assembly includes a conveying pipe and an auger screw. The water cooling assembly includes a water cooling sleeve, a water injection pipe, and a set of sponge tube sleeves. One end of the upper wall of the conveying pipe is connected to a feed head, and the lower end of the conveying pipe away from the feed head is connected to a discharge head. The auger screw is rotatably sleeved inside the conveying pipe, and one end of the auger screw shaft passes through the end face of the conveying pipe and is connected to the output end of a motor for transmission. The water cooling sleeve is sleeved on the outside of the conveying pipe, and the water injection pipe is positioned above the water cooling sleeve. A set of water injection heads is axially arrayed on the lower wall of the water injection pipe, and the water injection heads pass through the upper wall of the water cooling sleeve. A set of sponge tube sleeves is axially arrayed on the outside of the conveying pipe, and the feed head and discharge head pass through the two end side walls of the water cooling sleeve, respectively.

[0006] A further feature of this invention is that the lower end of the water-cooled jacket is integrally formed with a drainage groove, one end of which is connected to a water storage tank via a pipe. A water pump is installed inside the water storage tank, and the water pump is connected to a water pump via a pipe. The outlet of the water pump is connected to one end of the water injection pipe via a pipeline.

[0007] A further feature of this invention is that a flow guide cone shell is provided inside the water storage tank. The flow guide cone shell is an integrally formed conical shell and cylindrical structure with the pointed end facing upwards. The lower end face of the cylindrical flow guide cone shell is fixedly installed at the bottom of the water storage tank. A set of permeable holes are circumferentially arrayed through the lower end side wall of the cylindrical flow guide cone shell.

[0008] A further feature of this invention is that a diffuser ring is fixedly installed on the lower end face of the water storage tank, and a ventilation hole is circumferentially arrayed on the upper side wall of the diffuser ring. A fan is fixedly installed on the lower end face of the diffuser ring.

[0009] A further feature of this invention is that a set of guide plates are fixedly arranged in a circumferential array on the inner wall of the diffuser ring, and the guide plates are perpendicular to the inner wall of the diffuser ring.

[0010] A further feature of this invention is that a temperature-conducting ring is installed on the bottom surface of the water storage tank, and a set of temperature-conducting fins are fixed on the upper end surface of the temperature-conducting ring.

[0011] This utility model has the following beneficial effects: This invention utilizes a sponge sleeve axially arrayed around the conveying pipe and sprays cooling water directly onto it via a water injection pipe. The sponge continuously absorbs the cooling water and evaporates to absorb heat, providing efficient and uniform circumferential cooling for the conveying pipe. This effectively counteracts the frictional heat generated during the screw conveying process and the heat conduction from the environment, reliably preventing the 2-cyanopyridine powder from melting during the feeding process.

[0012] This invention integrates the screw conveyor assembly with a water-cooling assembly consisting of a water-cooled jacket, a water injection pipe, and a sponge sleeve, achieving simultaneous material conveying and active cooling. This ensures stable and controllable temperature throughout the entire process from feeding to discharging, providing a stable and continuous supply of qualified raw materials for the subsequent melting and crystallization process. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a continuous feeding device for the melt crystallization of 2-cyanopyridine.

[0015] Figure 2 This is an exploded view of the screw conveyor assembly.

[0016] Figure 3 This is a side sectional view of the water-cooled bushing and screw conveyor assembly.

[0017] Figure 4 This is an exploded view of the water storage tank and the guide cone shell.

[0018] Figure 5 This is an exploded view of the water storage tank and the diffuser ring.

[0019] The attached diagram lists the components represented by each number as follows: 1-Screw conveyor assembly, 101-Conveying pipe, 101a-Infeed pipe head, 101b-Discharge pipe head, 102-Auger screw, 2-Water cooling assembly, 201-Water cooling jacket, 201a-Drainage trough, 202-Water injection pipe, 202a-Water injection head, 203-Sponge pipe sleeve, 204-Water storage tank, 204a-Water extraction head, 204a-1-Water pump, 204b-Guide cone shell, 204b-1-Water permeable hole, 204c-Diffuser ring sleeve, 204c-1-Ventilation hole, 204c-2-Fan, 204c-3-Guide plate, 204d-Temperature guiding ring, 204d-1-Temperature guiding fin. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example 1

[0021] Please see Figures 1 to 5 This invention relates to a continuous feeding device for the melt crystallization of 2-cyanopyridine, comprising a screw conveying assembly 1 and a water-cooling assembly 2. The screw conveying assembly 1 includes a conveying pipe 101 and an auger screw 102. The water-cooling assembly 2 includes a water-cooling sleeve 201, a water injection pipe 202, and a set of sponge sleeves 203. One end of the upper wall of the conveying pipe 101 is connected to a feed pipe head 101a, and the lower end of the conveying pipe 101, away from the feed pipe head 101a, is connected to a discharge pipe head 101b. The auger screw 102 is rotatably sleeved inside the conveying pipe 101, and one end of the auger screw 102's shaft passes through the end face of the conveying pipe 101 and is connected to the output end of a motor. The water-cooling sleeve 201 is sleeved on the outside of the conveying pipe 101, and the water injection pipe 202 is located on the water-cooling sleeve 201. Above, a set of water injection heads 202a are axially arrayed on the lower end of the water injection pipe 202. The water injection heads 202a penetrate the upper end of the water-cooled jacket 201. A set of sponge sleeves 203 are axially arrayed and sleeved on the outside of the conveying pipe 101. The feed pipe head 101a and the discharge pipe head 101b penetrate the side walls at both ends of the water-cooled jacket 201. The 2-cyanopyridine powder is continuously conveyed by the auger screw 102. At the same time, the water injection pipe 202 sprays cooling water evenly onto the sponge sleeves 203. The sponge absorbs heat and cools the conveying pipe 101 continuously and evenly by adsorption and water evaporation. This effectively offsets the frictional heat of material conveying and the heat transfer from the environment, ensuring that the temperature of the material is below its melting point throughout the conveying process, preventing premature melting, and ensuring a continuous and stable supply of material for the subsequent melting and crystallization process.

[0022] Specifically, the lower end of the water-cooled jacket 201 has an integrally formed drainage groove 201a. One end of the drainage groove 201a is connected to a water storage tank 204 via a pipe. A water pump 204a is installed inside the water storage tank 204. The water pump 204a is connected to a water pump 204a-1 via a pipe. The outlet of the water pump 204a-1 is connected to one end of the water injection pipe 202 via a pipe. The cooling water that flows down after spraying is collected in the water storage tank 204 and pumped back to the water injection pipe 202 for recycling by the water pump 204a-1. This significantly saves water resources. At the same time, the circulation of water carries away a large amount of heat, maintaining the low temperature of the cooling medium itself and improving the overall cooling efficiency and economy.

[0023] Furthermore, a guide cone shell 204b is provided inside the water storage tank 204. The guide cone shell 204b is an integrally formed conical shell and cylindrical structure with the tip pointing upward. The lower end face of the cylindrical guide cone shell 204b is fixedly installed on the bottom of the water storage tank 204. A set of permeable holes 204b-1 are circumferentially arrayed on the lower side wall of the cylindrical guide cone shell 204b. The guide cone shell 204b can guide the return water to flow smoothly along its cone surface to the surrounding walls of the tank, avoiding water flow directly impacting the bottom of the tank and causing splashing and turbulence.

[0024] Furthermore, a diffuser ring 204c is fixedly installed on the lower end face of the water storage tank 204. A perforation hole 204c-1 is circumferentially arrayed on the upper side wall of the diffuser ring 204c. A fan 204c-2 is fixedly installed on the lower end face of the diffuser ring 204c. The airflow generated by the fan 204c-2 blows upward through the perforation hole 204c-1 over the outer wall of the water storage tank 204 and the surface of the water inside, effectively reducing the temperature of the circulating cooling water, thereby improving its heat absorption capacity as a cooling medium again, and enhancing the heat dissipation efficiency and continuous working capacity of the entire cooling system.

[0025] Furthermore, a set of guide plates 204c-3 are fixedly arranged in a circumferential array on the inner wall of the diffuser ring 204c. The guide plates 204c-3 are perpendicular to the inner wall of the diffuser ring 204c. The guide plates 204c-3 can organize the airflow blown in by the fan 204c-2 into a more uniform and orderly rising airflow, avoiding the formation of vortices in the airflow within the diffuser ring 204c that would lead to uneven heat dissipation. This ensures that the contact area between the airflow and the water tank 204 is maximized, thereby optimizing the air-cooling effect and improving the cooling efficiency.

[0026] Furthermore, a temperature-conducting ring 204d is installed on the bottom surface of the water storage tank 204, and a set of temperature-conducting fins 204d-1 is fixed on the upper end surface of the temperature-conducting ring 204d. The temperature-conducting ring 204d and the temperature-conducting fins 204d-1 are made of high thermal conductivity material, which can quickly conduct the heat from the bottom of the water in the water storage tank 204 to the outside air at the bottom of the tank, increasing the heat dissipation area and forming a synergistic heat dissipation with the upper air cooling, further accelerating the overall cooling speed of the circulating water, and ensuring that the cooling system can maintain a good working condition even under long-term continuous operation.

[0027] The operation process of this embodiment is as follows: The device is started, and the water pump 204a-1 pumps the cooling water from the water storage tank 204 to the water injection pipe 202, and sprays it evenly onto the sponge sleeve 203 outside the conveying pipe 101 through the water injection head 202a, ensuring it is fully wetted. Simultaneously, the drive motor drives the auger screw 102 to rotate inside the conveying pipe 101. 2-cyanopyridine powder raw material is continuously added from the feed pipe head 101a, and the auger screw 102 propels it forward. During this process, the wet sponge sleeve 203 continuously absorbs heat from the conveying pipe 101 through water evaporation, maintaining a low-temperature environment inside the pipe and preventing the material from melting. The cooling and conveying process is completed. The material is finally discharged from the discharge pipe 101b and enters the next process; the water flowing down after spraying is collected in the drainage trough 201a at the bottom of the water-cooled jacket 201 and flows back to the water storage tank 204; the returned water is guided and settled by the guide cone shell 204b, and the relatively clean water reaches the bottom of the tank through the water permeable hole 204b-1 and is pumped out again by the water pump for recycling; at the same time, the fan 204c-2 is started, and the airflow is guided by the guide plate 204c-3 and blown into the water storage tank 204 through the vent 204c-1 to assist in heat dissipation. The temperature conducting ring 204d and the temperature conducting fin plate 204d-1 also help to dissipate the heat of the water, together maintaining the low temperature of the circulating cooling water.

[0028] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A continuous feeding device for the melt crystallization of 2-cyanopyridine, comprising a screw conveyor assembly (1) and a water cooling assembly (2), characterized in that: The screw conveying assembly (1) includes a conveying pipe (101) and an auger screw (102). The water cooling assembly (2) includes a water cooling sleeve (201), a water injection pipe (202), and a set of sponge sleeves (203). One end of the upper wall of the conveying pipe (101) is connected to a feed pipe head (101a), and the other end of the lower wall of the conveying pipe (101) away from the feed pipe head (101a) is connected to a discharge pipe head (101b). The auger screw (102) is rotatably sleeved inside the conveying pipe (101), and one end of the shaft of the auger screw (102) passes through the end face of the conveying pipe (101). It is connected to the output end of the motor for transmission. The water-cooled jacket (201) is sleeved on the outside of the conveying pipe (101). The water injection pipe (202) is set above the water-cooled jacket (201). A set of water injection heads (202a) is arranged in an axial array on the lower end of the water injection pipe (202). The water injection head (202a) penetrates the upper end of the water-cooled jacket (201). A set of sponge sleeves (203) is axially arranged on the outside of the conveying pipe (101). The feed pipe head (101a) and the discharge pipe head (101b) penetrate the two end side walls of the water-cooled jacket (201) respectively.

2. The continuous feeding device for 2-cyanopyridine melt crystallization according to claim 1, characterized in that: The lower end of the water-cooled sleeve (201) has an integrally formed drainage groove (201a). One end of the drainage groove (201a) is connected to a water storage tank (204) through a pipe. A water pump (204a) is installed inside the water storage tank (204). The water pump (204a) is connected to a water pump (204a-1) through a pipe. The outlet of the water pump (204a-1) is connected to one end of the water injection pipe (202) through a pipe.

3. The continuous feeding device for 2-cyanopyridine melt crystallization according to claim 2, characterized in that: The water storage tank (204) is provided with a flow guide cone shell (204b). The flow guide cone shell (204b) is an integrally formed conical shell and cylindrical structure with the tip pointing upward. The lower end face of the cylindrical flow guide cone shell (204b) is fixedly installed on the bottom of the water storage tank (204). A set of water permeable holes (204b-1) are circumferentially arrayed on the lower end side wall of the cylindrical flow guide cone shell (204b).

4. A continuous feeding device for the melt crystallization of 2-cyanopyridine according to claim 3, characterized in that: A diffuser ring (204c) is fixedly installed on the lower end face of the water storage tank (204). A ventilation hole (204c-1) is circumferentially arrayed on the upper side wall of the diffuser ring (204c). A fan (204c-2) is fixedly installed on the lower end face of the diffuser ring (204c).

5. A continuous feeding device for the melt crystallization of 2-cyanopyridine according to claim 4, characterized in that: A set of guide plates (204c-3) are fixedly arranged in a circumferential array on the inner wall of the diffuser ring (204c), and the guide plates (204c-3) are perpendicular to the inner wall of the diffuser ring (204c).

6. A continuous feeding device for 2-cyanopyridine melt crystallization according to claim 5, characterized in that: The bottom surface of the water storage tank (204) is equipped with a temperature-conducting ring (204d), and a set of temperature-conducting fins (204d-1) are fixed on the upper surface of the temperature-conducting ring (204d).

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