Seed charging device

Abstract

The utility model provides a kind of crystal seed feeding device, which is arranged between the crystal seed bin and the crystallization kettle. The crystal seed feeding device comprises a feed inlet, a discharge outlet, and a containing cavity located between the feed inlet and the discharge outlet. The diameter of the containing cavity is larger than the diameters of the feed inlet and the discharge outlet. Since the diameter of the containing cavity is large, the flow rate of the crystal seeds decreases after entering the containing cavity, and it is difficult for air and moisture to enter the interior of the device along with the flow of the crystal seeds. At the same time, the closed environment of the containing cavity provides conditions for the removal of moisture from the crystal seeds. After buffering in the containing cavity, the crystal seeds are added to the crystallization kettle through the discharge outlet, thereby avoiding the problem of reduced solution crystallization quality caused by the mixing of air or moisture in the crystal seeds.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical feeding devices, and in particular to a seed crystal feeding device. Background Technology

[0002] Crystallization is a phase transition process in which a substance transforms from a liquid, gaseous, or molten state into a regular, ordered solid crystal structure. Its core lies in the orderly arrangement of molecules or atoms to form a crystal lattice structure. The spontaneous aggregation of solute molecules or atoms to form crystal nuclei of a critical size requires overcoming a relatively high energy barrier. Nucleation sites are provided by impurities, the surface of the container, or external seed crystals, lowering the energy barrier and accelerating crystal nucleation.

[0003] Seed crystals, acting as solid-phase templates, directly provide an ordered lattice structure, allowing solute molecules to preferentially align on their surface and significantly reducing the energy required for nucleation. For example, in the crystallization of triphenylphosphine, adding pure seed crystals can rapidly crystallize from a supersaturated solution, avoiding the oxidation risk caused by prolonged waiting for spontaneous nucleation.

[0004] Currently, the seed crystal feeding method involves directly connecting the seed crystal hopper to the liquid crystal reactor, and directly adding the seed crystals from the seed crystal hopper into the liquid crystal reactor. This results in air or moisture being mixed into the seed crystals, affecting the crystallization quality. Utility Model Content

[0005] The technical problem this invention aims to solve is that air or moisture mixed into the seed crystals during the current seed crystal feeding process can affect the crystallization quality of the solution.

[0006] To address the aforementioned problems, this utility model provides a seed crystal feeding device, which is disposed between a seed crystal silo and a crystallization vessel. The seed crystal feeding device includes an inlet, an outlet, and a receiving cavity located between the inlet and the outlet, wherein the diameter of the receiving cavity is larger than the diameter of the inlet and the outlet.

[0007] In this design, due to the large diameter of the receiving cavity, the flow rate of the seed crystals decreases after they enter, making it difficult for air and moisture to enter the device along with the seed crystals. Simultaneously, the sealed environment of the receiving cavity facilitates the removal of moisture from the seed crystals. After being buffered by the receiving cavity, the seed crystals are then added to the crystallization vessel through the outlet, avoiding problems such as decreased solution crystallization quality due to air or moisture contamination in the seed crystals, including uneven crystal size and reduced purity.

[0008] Furthermore, in order to control the residence time of the seed crystals in the seed crystal feeding device, a first valve is installed at the inlet and a second valve is installed at the outlet, based on the above-mentioned seed crystal feeding device.

[0009] In order to improve the removal efficiency of impurities such as air or moisture in the seed crystal feeding device, the receiving cavity is connected to a negative pressure pump.

[0010] Furthermore, the negative pressure pump is connected to the upper part of the receiving cavity via a pipe.

[0011] Optionally, a sludge discharge port is provided at the top of the receiving cavity, and the negative pressure pump is connected to the sludge discharge port through a pipe.

[0012] To control the rate of seed crystal feeding, the first valve and / or the second valve may optionally be rotary valves.

[0013] To improve the efficiency of seed crystal feeding control, the first valve and / or the second valve are electrically actuated valves, which are electrically connected to the controller.

[0014] The technical advantages of this utility model are as follows:

[0015] In the seed crystal feeding device provided by this utility model, the receiving cavity is located between the inlet and the outlet. The diameter of the cavity is larger than the diameters of the inlet and outlet, creating a relatively large space. Due to the larger diameter of the receiving cavity, the flow rate of the seed crystals decreases after they enter, making it difficult for air and moisture to enter the device along with the seed crystals. Simultaneously, the sealed environment of the receiving cavity provides conditions for the removal of moisture from the seed crystals. After being buffered by the receiving cavity, the seed crystals are then added to the crystallization kettle through the outlet, avoiding the problem of decreased solution crystallization quality caused by air or moisture mixed in with the seed crystals, such as uneven crystal particle size and reduced purity. The seed crystal feeding device of this utility model effectively solves the problem of air and moisture mixing during the seed crystal feeding process, improving the quality of solution crystallization.

[0016] A first valve is installed at the inlet and a second valve is installed at the outlet. Through reasonable valve settings and operating procedures, the seed feeding control speed of the seed feeding device is further optimized, which can further improve the quality of solution crystallization.

[0017] The negative pressure environment created by the negative pressure pump within the receiving chamber actively extracts air introduced during seed crystal insertion and residual moisture from the seeds, significantly improving the efficiency of air and moisture removal. Compared to relying solely on the sealed environment of the receiving chamber for natural evaporation or volatilization, this method is more effective in ensuring the purity of the seeds and thus improving the quality of solution crystallization. By continuously maintaining the negative pressure state within the receiving chamber, problems such as uneven crystallization caused by air accumulation can be reduced, making the seed crystal feeding process more stable and reliable. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the seed crystal feeding device in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram showing the connection between the first valve, the second valve, and the controller in an embodiment of this utility model;

[0020] Explanation of reference numerals in the attached figures:

[0021] 100. Seed crystal feeding device; 1. Inlet; 2. Outlet; 3. Receiving cavity; 31. Impurity discharge port; 4. First valve; 5. Second valve; 6. Negative pressure pump; 7. Controller;

[0022] 200. Seed silo; 300. Crystallization kettle. Detailed Implementation

[0023] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0024] The technical problem this invention aims to solve is that air or moisture mixed into the seed crystals during the current seed crystal feeding process affects the crystallization quality of the solution. To address this problem, this invention provides a seed crystal feeding device, such as... Figure 1 This illustration shows one embodiment of the seed crystal feeding device provided by this utility model. The seed crystal feeding device 100 is disposed between the seed crystal hopper 200 and the crystallization vessel 300, playing a crucial role in seed crystal delivery and feeding in the industrial crystallization production process. The seed crystal hopper 200 is used to store the seeds to be added, while the crystallization vessel 300 is the solution container for crystallization. The seed crystal feeding device 100, acting as a bridge connecting the two, can stably transport the seeds from the seed crystal hopper 200 to the crystallization vessel 300, while preventing air and moisture from entering, thus ensuring crystal quality.

[0025] The seed crystal feeding device 100 includes an inlet 1, an outlet 2, and a receiving cavity 3 located between the inlet 1 and the outlet 2.

[0026] Inlet 1 is the channel through which seed crystals enter the seed feeding device 100. It is connected to the outlet of the seed hopper 200 and has a relatively small diameter. The smaller diameter of inlet 1 helps control the feeding speed and flow rate of the seed crystals, preventing them from being too dispersed or rushing in too large a quantity when entering the device, thereby reducing the amount of air carried into the device. In actual operation, inlet 1 is tightly connected to the outlet pipe of the seed hopper 200 to ensure that the seed crystals can smoothly enter the seed feeding device 100 from the seed hopper 200.

[0027] Outlet 2 is the channel through which the seed crystals leave the seed crystal feeding device 100 and enter the crystallization vessel 300, and it also has a relatively small diameter. The smaller diameter of outlet 2 allows for control of the seed crystal discharge rate, ensuring that the seed crystals are added to the crystallization vessel 300 uniformly and stably, avoiding problems such as excessively high local concentrations of the solution or uneven crystallization caused by excessively rapid discharge. Outlet 2 is connected to the feed pipe of the crystallization vessel 300, ensuring that the seed crystals can enter the solution to be crystallized.

[0028] The receiving cavity 3 is located between the inlet 1 and the outlet 2. Its diameter is larger than that of both the inlet 1 and outlet 2, creating a relatively large space. When the seed crystals enter the receiving cavity 3 from the inlet 1, the sudden expansion of the space reduces the flow rate of the seed crystals, thus minimizing turbulence and bubbles generated by the seed crystal flow. Simultaneously, the larger volume of the receiving cavity 3 provides a buffer zone for the seed crystals, accommodating a certain amount of seed crystals during the feeding process. This allows the seed crystals to remain within the device for a period of time, facilitating the dissipation of any trace moisture or attached air carried by the seed crystals in the relatively enclosed environment at the top of the receiving cavity 3, further reducing the impact of moisture and air on the crystallization quality.

[0029] Working process: During the seed crystal feeding process, the seed crystals enter the receiving cavity 3 of the seed crystal feeding device 100 from the seed crystal hopper 200 through the feed port 1. Due to the large diameter of the receiving cavity 3, the flow rate of the seed crystals decreases after entering, making it difficult for air and moisture to enter the device with the flow of the seed crystals. At the same time, the sealed environment of the receiving cavity 3 provides conditions for the removal of moisture from the seed crystals. After being buffered by the receiving cavity 3, the seed crystals are then added to the crystallization kettle 300 through the discharge port 2, avoiding the problem of decreased solution crystallization quality caused by air or moisture mixed in with the seed crystals, such as uneven crystal particle size and reduced purity.

[0030] In summary, the seed crystal feeding device 100 of this invention effectively solves the problem of air and moisture mixing during the seed crystal feeding process, thereby improving the quality of solution crystallization.

[0031] Continue to refer to Figure 1 Based on the above-mentioned seed crystal feeding device 100, a first valve 4 is installed at the inlet 1 and a second valve 5 is installed at the outlet 2. The first valve 4 is installed at the connection between the inlet 1 and the outlet pipe of the seed crystal silo 200.

[0032] The first valve 4 and / or the second valve 5 can be of various types, such as rotary valves, butterfly valves, ball valves, etc. The specific selection can be based on a comprehensive consideration of factors such as flow control requirements, sealing performance requirements, and ease of operation in actual production.

[0033] Taking a rotary valve as an example, a rotary valve mainly consists of a valve body, a valve core, and a drive device. The valve body is the main structure of the valve, providing the foundation for installation and sealing; the valve core is cylindrical or disc-shaped and can rotate around its own axis within the valve body; the drive device is used to drive the valve core to rotate, realizing the opening and closing of the valve. Taking a common cylindrical rotary valve as an example, its valve core has a channel that matches the size of the inlet or outlet. When the valve core rotates to align the channel with the inlet or outlet, the valve opens, and the seed crystals can pass through; when the valve core rotates to misalign the channel with the inlet or outlet, the valve closes, and the flow of seed crystals is blocked. The rotation angle of the valve core and the opening degree of the rotary valve have a good linear relationship. By precisely controlling the rotation angle of the valve core, the feeding and discharging speeds of the seed crystals can be adjusted, meeting the strict requirements of different crystallization processes for the amount of seed crystals added, and improving the stability of the crystallization process and the consistency of crystal quality. The rotary valve boasts excellent sealing performance, effectively preventing leakage of seed crystals and solution when closed. Its adjustable opening allows for flexible adjustments based on different crystallization stages. For example, in the initial stage of the crystallization process, the valve opening can be fine-tuned to allow for slow seed crystal addition, preventing excessively high local concentrations. During discharge, the valve precisely controls the seed crystal discharge rate based on the state of the solution to be crystallized, ensuring uniform seed crystal distribution. The rotary valve's simple structure and convenient operation allow it to adapt to varying flow rates and pressures during seed crystal feeding, ensuring stable operation of the equipment in diverse production environments.

[0034] Before the seed crystal feeding operation begins, both the first valve 4 and the second valve 5 are closed. At this time, the channel between the seed crystal feeding device 100 and the seed crystal hopper 200 and the liquid tank 300 to be crystallized is cut off, forming a relatively independent and sealed space inside the device, which helps to reduce the contact between air and moisture and the seed crystals.

[0035] When seed crystal feeding is required, the first valve 4 is first opened, allowing the seed crystals in the seed crystal hopper 200 to enter the receiving cavity 3 of the seed crystal feeding device 100 through the feed inlet 1. During the feeding process, the opening degree or rotation speed of the first valve 4 can be controlled according to actual production needs, thereby adjusting the seed crystal feeding speed and flow rate. For example, in the initial stage of the crystallization process, the seed crystals need to be added slowly. At this time, the opening degree or rotation speed of the first valve 4 can be reduced, allowing the seed crystals to enter the receiving cavity 3 at a slower speed, avoiding excessively high local concentrations of the solution due to excessively rapid seed crystal addition. As feeding proceeds, the number of seed crystals in the receiving cavity 3 gradually increases. At the same time, the large diameter design of the receiving cavity 3 reduces the seed crystal flow rate, minimizing the entry of air and moisture with the seed crystals.

[0036] When the seed crystals in the receiving cavity 3 reach a certain amount and have undergone sufficient buffering, the second valve 5 is opened, allowing the seed crystals to be added to the liquid tank 300 to be crystallized through the discharge port 2. During the discharge process, the discharge speed of the seed crystals can also be controlled by adjusting the opening degree or rotation speed of the second valve 5.

[0037] After the seed crystals are fed, first close the second valve 5 to prevent the seed crystals from continuing to enter the liquid tank 300 for crystallization, and at the same time prevent the solution to be crystallized from flowing back into the seed crystal feeding device 100. Then close the first valve 4 to cut off the channel between the seed crystal hopper 200 and the seed crystal feeding device 100, thus completing one complete seed crystal feeding operation.

[0038] By adjusting the opening degree or rotation speed of the first valve 4 and the second valve 5, the feeding and discharging speeds of the seed crystals can be controlled, thereby achieving control over the amount of seed crystals added.

[0039] In summary, the preferred embodiment, which sets a first valve 4 at the inlet 1 and a second valve 5 at the outlet 2, further optimizes the performance of the seed crystal feeding device 100 through reasonable valve settings and operating procedures, effectively solves the problem of air and moisture mixing during the seed crystal feeding process, and improves the quality of solution crystallization.

[0040] Continue to refer to Figure 1 In a preferred embodiment, a connection is established between the receiving cavity 3 of the seed crystal feeding device 100 and the negative pressure pump 6. Specifically, the negative pressure pump 6 is connected to the upper part of the receiving cavity 3 via a pipe. One end of the pipe is connected to the air inlet of the negative pressure pump 6, and the other end is connected to the upper region of the receiving cavity 3. The upper region is provided with a discharge port 31, and a suitable sealing method is adopted, such as using a sealing ring or welding process, to ensure that there is no leakage at the connection, so as to maintain a good negative pressure environment. The location of the discharge port 31 in the upper part of the receiving cavity 3 is chosen because air and moisture tend to accumulate upwards during the seed crystal flow process, and connecting the negative pressure pump 6 at this location can more effectively extract these impurities.

[0041] Before performing the seed crystal feeding operation, ensure that the negative pressure pump 6 is in normal working condition and check that the pipeline connections are secure and the seals are good. At this time, both the first valve 4 and the second valve 5 are closed, and the inside of the seed crystal feeding device 100 is a relatively sealed space. Start the negative pressure pump 6 to begin operation, gradually creating a negative pressure environment in the receiving cavity 3. The negative pressure value in the receiving cavity 3 can be observed in real time using monitoring equipment such as a negative pressure gauge. According to actual production needs, the negative pressure value can be adjusted to a suitable range to ensure that air and moisture are effectively extracted without causing adverse effects on the seed crystals and the device due to excessive negative pressure.

[0042] Once the set negative pressure value is reached within the receiving cavity 3, the first valve 4 is opened, and the seed crystals enter the receiving cavity 3 from the seed hopper 200 through the feed port 1. Because the receiving cavity 3 is under negative pressure, air and moisture are drawn into the receiving cavity 3 along with the seed crystals during entry, and quickly accumulate at the top of the receiving cavity 3. The negative pressure pump 6 continuously operates, extracting this accumulated air and moisture through pipes, further reducing the air and moisture content mixed into the seed crystals. During the feeding process, the opening of the first valve 4 can be adjusted appropriately according to the characteristics of the seed crystals and the crystallization process requirements to control the seed crystal feeding speed, ensuring that the seed crystals can enter the receiving cavity 3 uniformly, while the negative pressure pump 6 can promptly extract the generated air and moisture.

[0043] After the seed crystal enters the receiving cavity 3, it remains inside for a period of time. During this period, in addition to the previously mentioned effect of the large-diameter design of the receiving cavity 3 reducing the seed crystal flow rate, the negative pressure environment also helps to further dissipate residual moisture in the seed crystal. This is because under negative pressure, moisture is more easily evaporated from the surface or interior of the seed crystal and extracted by the negative pressure pump 6.

[0044] Once the seed crystals in the receiving chamber 3 have reached a certain quantity and have undergone sufficient buffering and purification, the second valve 5 is opened, allowing the seed crystals to be evenly added to the liquid tank 300 to be crystallized through the discharge port 2. During the discharge process, the negative pressure pump 6 continues to operate to prevent outside air from flowing back into the receiving chamber 3 through the discharge port 2. Simultaneously, the opening degree of the second valve 5 can be adjusted according to the state of the solution to be crystallized and the crystallization process requirements to control the discharge rate of the seed crystals, ensuring that the seed crystals are evenly distributed in the solution to be crystallized.

[0045] After the seed crystals are fed, first close the second valve 5 to prevent the seed crystals from continuing to enter the liquid crystal tank 300. Then close the first valve 4 to cut off the channel between the seed crystal hopper 200 and the seed crystal feeding device 100. Finally, turn off the negative pressure pump 6 to end this seed crystal feeding operation. After turning off the negative pressure pump 6, the remaining seed crystals in the receiving cavity 3 can be cleaned to prepare for the next feeding operation.

[0046] The negative pressure environment created by the negative pressure pump 6 within the receiving chamber 3 actively extracts air introduced during the seed crystal insertion process, as well as residual moisture within the seed crystals. This significantly improves the efficiency of air and moisture removal compared to relying solely on the sealed environment of the receiving chamber 3 for natural evaporation or volatilization. This method more effectively ensures the purity of the seed crystals, thereby improving the quality of solution crystallization. By continuously maintaining the negative pressure state within the receiving chamber 3, problems such as uneven crystallization caused by air accumulation can be reduced, making the seed crystal feeding process more stable and reliable.

[0047] In a preferred embodiment where the receiving cavity 3 is connected to the negative pressure pump 6 and the negative pressure pump 6 is connected to the upper part of the receiving cavity 3 through a pipeline, the role of the negative pressure pump 6 is fully utilized through reasonable structural design and operation process, further optimizing the performance of the seed crystal feeding device 100, effectively solving the problem of air and moisture mixing during the seed crystal feeding process, and improving the quality of solution crystallization.

[0048] Combination Figure 1 and Figure 2 In some embodiments, the first valve 4 and / or the second valve 5 are electrically actuated valves and electrically connected to the controller 7. The electrically actuated valve mainly consists of an electric actuator and a valve body. The electric actuator is the power drive component of the electrically actuated valve and typically includes a motor, reducer, position sensor, and control circuit. The motor provides rotational power, the reducer converts the high-speed rotation of the motor into a low-speed, high-torque rotation suitable for valve operation, the position sensor provides real-time feedback on the valve's opening position, and the control circuit receives external control signals and drives the motor. The valve body can be selected from different types of valves, such as butterfly valves or ball valves, depending on actual needs. It is connected to the electric actuator via connecting components to realize the valve's opening, closing, and opening adjustment functions.

[0049] Controller 7 is the control center of the seed crystal feeding device. Controller 7 can receive input commands from the operator, such as setting parameters such as the flow rate and time of seed crystal feeding; it can control the electric actuator valve according to the preset program to realize the opening, closing and opening degree adjustment of the valve; at the same time, it can also monitor the operating status of the electric actuator valve in real time, such as the valve opening position and the motor operating current, and feed this information back to the operator so as to detect and deal with abnormal situations in a timely manner.

[0050] The controller 7 typically features a human-machine interface, allowing operators to set parameters and control operations. For example, parameters such as the initial flow rate of seed crystal feeding, feeding interval, and maximum feeding amount can be set. The controller 7 can also pre-store various control programs according to different crystallization process requirements. Operators can simply select the appropriate program for one-button operation, greatly improving the convenience and flexibility of operation.

[0051] The electrically operated valve and controller 7 are electrically connected via wires. The wires transmit the control signals output from controller 7 to the electric actuator of the electrically operated valve, and simultaneously transmit the feedback signals from the position sensor of the electrically operated valve back to controller 7, forming a closed-loop control system. During the connection process, it is necessary to ensure that the cable connection is secure and has good contact to avoid signal interference or loss.

[0052] Work process:

[0053] Feeding Stage: When seed crystal feeding is required, the operator inputs the feeding command through the human-machine interface of the controller 7, setting the seed crystal feeding flow rate and feeding time. After receiving the command, the controller 7 calculates the opening value of the electric actuator valve according to the preset control algorithm and outputs the corresponding control signal to the electric actuator of the electric actuator valve. After receiving the signal, the electric actuator drives the motor to rotate, which drives the valve body to open through the reducer, allowing the seed crystals to enter the receiving cavity 3 of the seed feeding device 100 from the seed hopper 200 through the feed port 1. During the feeding process, the position sensor feeds back the valve opening position information to the controller 7 in real time. The controller 7 compares the feedback information with the set value and continuously adjusts the control signal to ensure that the opening of the electric actuator valve is always maintained at the set value, thereby achieving precise control of the seed crystal feeding flow rate.

[0054] Buffering and Adjustment Stage: After the seed crystals enter the receiving chamber 3, the seed crystal flow rate needs to be dynamically adjusted according to the requirements of the crystallization process. For example, when the seed crystals in the receiving chamber 3 reach a certain amount, the feed flow rate needs to be reduced to avoid seed crystal accumulation. At this time, the controller 7 can automatically adjust the opening of the electric actuator valve according to the preset program or the operator's instructions to achieve a smooth transition of the seed crystal feed flow rate.

[0055] Discharge Stage: After the seed crystals have completed buffering and purification within the receiving chamber 3, a discharge operation is required. The operator inputs the discharge command through the controller 7, setting the discharge flow rate and discharge time. Following the same control principle as the feeding stage, the controller 7 controls the opening of the electric actuator valve, allowing the seed crystals to be evenly added to the liquid tank 300 to be crystallized through the discharge port 2. During the discharge process, the opening degree of the electric actuator valve can also be adjusted in real time according to actual conditions to ensure the stability and uniformity of the seed crystal discharge rate.

[0056] Stop feeding phase: After the seed crystal feeding is completed, the operator inputs a stop command through controller 7. Upon receiving the command, controller 7 outputs a control signal to the electric actuator valve, causing the electric actuator to drive the valve body to close, cutting off the flow of seed crystals and completing one full seed crystal feeding operation.

[0057] By connecting the electric actuator valve to controller 7, the seed crystal feeding process is automated, reducing manual intervention, lowering labor intensity, and improving production efficiency. Simultaneously, automated control avoids operational errors caused by human factors, ensuring the accuracy and stability of seed crystal feeding. Controller 7 can adjust the opening of the electric actuator valve according to preset programs and feedback signals, controlling the seed crystal feed and discharge flow rates. This is particularly important for crystallization processes with strict requirements on seed crystal dosage, effectively improving crystal quality. Controller 7 can monitor the operating status of the electric actuator valve and relevant parameters of the seed crystal feeding process in real time and record this information. Operators can view this information at any time through a human-machine interface, promptly identifying and handling abnormalities. Furthermore, controller 7 can communicate with other production equipment, enabling centralized monitoring and management of the entire production process, improving the efficiency and level of production management.

[0058] In summary, in the preferred embodiment where the first valve 4 and / or the second valve 5 are electrically actuated and electrically connected to the controller 7, the automation, precision, and efficiency of the seed crystal feeding process are achieved through the control of the electrically actuated valves and the management of the controller 7, providing a reliable guarantee for solution crystallization. In practical applications, the model of the electrically actuated valve, the function and parameters of the controller 7 can be adjusted and optimized according to specific production needs, but all such adjustments should fall within the protection scope of this utility model.

[0059] Finally, it should be noted that: unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A seed crystal feeding device, characterized in that, The seed feeding device (100) is located between the seed silo (200) and the crystallization vessel (300). It includes an inlet (1), an outlet (2) and a receiving cavity (3) located between the inlet (1) and the outlet (2). The diameter of the receiving cavity (3) is larger than the diameter of the inlet (1) and the outlet (2). The receiving cavity (3) is connected to a negative pressure pump (6).

2. The seed crystal feeding device according to claim 1, characterized in that, A first valve (4) is provided at the feed inlet (1), and a second valve (5) is provided at the discharge outlet (2).

3. The seed crystal feeding device according to claim 1, characterized in that, The negative pressure pump (6) is connected to the upper part of the receiving cavity (3) via a pipe.

4. The seed crystal feeding device according to claim 3, characterized in that, The upper part of the receiving cavity (3) is provided with a discharge port (31), and the negative pressure pump (6) is connected to the discharge port (31) through a pipe.

5. The seed crystal feeding device according to claim 2, characterized in that, The first valve (4) and / or the second valve (5) are rotary valves.

6. The seed crystal feeding device according to claim 2 or 5, characterized in that, The first valve (4) and / or the second valve (5) are electrically actuated valves, which are electrically connected to the controller (7).

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