Liquid level control device of vacuum crystallizer

Abstract

The utility model relates to a liquid level control device of a vacuum crystallizer. Relates to the technical field of vacuum crystallization. The device comprises a flash tank arranged below a crystallization pot, the flash tank is provided with an overflow port, and the bottom end of a discharge pipe extends into the flash tank and is lower than the overflow port, so that feed liquid and liquid level in the flash tank automatically flow out of the overflow port when reaching the height of the overflow port. The overflow port is formed in the overflow groove, the bottom end of the discharge pipe extends to the position below the overflow port in the overflow groove, when the liquid level of feed liquid in the overflow groove reaches the height where the overflow port is located, the feed liquid automatically flows out of the overflow port, liquid level control over the feed liquid in the overflow groove is achieved, and therefore the feed liquid in the overflow groove can be automatically discharged by controlling the liquid level of the feed liquid in the overflow groove. The liquid level control device is simple in structure, reliability of liquid level control in the vacuum crystallizer can be improved, and then the effect of liquid level control in the vacuum crystallizer is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of vacuum crystallization technology, and in particular to a liquid level control device for a vacuum crystallizer. Background Technology

[0002] A vacuum crystallizer is a type of chemical equipment used for continuous operation, primarily for crystallizing solutes from solutions into crystalline form. The working principle of a continuous vacuum crystallizer is as follows: hot liquid is continuously fed into the vacuum crystallizer by a feed pump. The crystallizer operates under an extremely high vacuum, causing some of the water in the hot liquid to evaporate, carrying away the heat and achieving cooling and crystallization. The cooled liquid is then continuously pumped out by a discharge pump.

[0003] In continuous vacuum crystallization processes, liquid level control within the vacuum crystallizer is a crucial aspect of production automation, essential for ensuring smooth crystallization, stable product quality, and improved production efficiency. Currently, liquid level control within the vacuum crystallizer is typically achieved through the coordinated operation of a liquid level sensor and a discharge pump. However, in practice, liquid level sensors are prone to malfunction or damage, leading to poor reliability of liquid level control within the vacuum crystallizer and consequently affecting its effectiveness.

[0004] Chinese patent document CN220714865U, published on 2013-11-27, discloses a continuous vacuum crystallizer liquid level control system, including a vacuum crystallizer. The vacuum crystallizer has a steam outlet at the top, a cold feed liquid outlet at the bottom, and a hot feed liquid inlet on the side wall. The cold feed liquid outlet is equipped with a liquid level control mechanism connected to the vacuum crystallizer. The liquid level control mechanism includes a cold feed liquid discharge pipe connected at one end to the cold feed liquid outlet and a sleeve sleeved on the other end of the cold feed liquid discharge pipe. The upper port of the sleeve is open to the atmosphere, and the lower port of the sleeve is lower than the outlet of the cold feed liquid discharge pipe. A liquid level sensor is provided on the wall of the sleeve.

[0005] However, this liquid level control system achieves liquid level control within the vacuum crystallizer by cooperating with a liquid level sensor installed on the outer wall of the casing and a discharge pump. In practice, however, the liquid level sensor is prone to malfunction or damage. Precise flow control of the discharge pump requires algorithms to coordinate multiple components, resulting in complex and unstable control. This leads to poor reliability of liquid level control within the vacuum crystallizer, ultimately affecting its effectiveness. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a vacuum crystallizer liquid level control device that eliminates the need for a liquid level sensor and a discharge pump, resulting in a simpler structure and improved reliability of liquid level control within the vacuum crystallizer, thereby ensuring the effectiveness of liquid level control within the vacuum crystallizer.

[0007] This utility model proposes a liquid level control device for a vacuum crystallizer. The vacuum crystallizer includes a crystallization pot and a discharge pipe. The crystallization pot is used to cool and crystallize the liquid material, and the discharge pipe is used to discharge the cooled and crystallized liquid material from the crystallization pot. The top of the crystallization pot is provided with a steam outlet, and the bottom is provided with a discharge outlet. The top end of the discharge pipe is connected to the discharge outlet, and the bottom end extends downward, including an overflow trough located below the crystallization pot. The upper part of the overflow trough is provided with an overflow port, and the bottom end of the discharge pipe extends into the overflow trough and is lower than the overflow port. Thus, when the liquid level in the overflow trough reaches the height of the overflow port, it automatically flows out from the overflow port.

[0008] Furthermore, the liquid level control device also includes a receiving tank and an overflow pipe. One end of the overflow pipe is connected to the overflow port and the other end is connected to the receiving tank, so that the liquid flowing out of the overflow port enters the receiving tank for storage after flowing through the overflow pipe.

[0009] Furthermore, the overflow port is an opening located on the upper side wall of the overflow trough.

[0010] Furthermore, the overflow port is an opening located at the top of the overflow trough.

[0011] Furthermore, the height of the overflow outlet Set to:

[0012] ,

[0013] In the formula: This refers to the required liquid level height to be maintained in the crystallization pot. The density of the liquid is related to the liquid itself. is the gravitational constant, and is a definite value; The local atmospheric pressure is a known value. The absolute pressure inside the crystallization pot remains constant during the operation of the crystallization pot.

[0014] Furthermore, the side wall of the crystallization pot is provided with a feed inlet, and the vacuum crystallizer also includes a storage tank containing liquid material, and a feed pipe with one end connected to the feed inlet and the other end connected to the storage tank, so that the liquid material in the storage tank is transported to the crystallization pot through the feed pipe.

[0015] Furthermore, the vacuum crystallizer also includes a feed pump connected to the storage tank, thereby driving the liquid in the storage tank to be transported to the crystallization pot through the feed pipe.

[0016] Furthermore, the liquid level control device also includes a stirring mechanism disposed in the overflow tank, the stirring mechanism being used to stir the liquid in the overflow tank.

[0017] The vacuum crystallizer liquid level control device proposed in this utility model has the following beneficial effects:

[0018] (1) This liquid level control device eliminates the liquid level sensor and discharge pump. It only sets an overflow port at the top of the overflow tank and the bottom end of the discharge pipe extends to the bottom of the overflow port in the overflow tank. When the liquid level in the overflow tank reaches the height of the overflow port, it automatically flows out from the overflow port, thereby realizing the liquid level control of the liquid in the overflow tank. By controlling the liquid level in the overflow tank, the liquid level in the crystallizing pot can be controlled. The structure is simpler and can improve the reliability of liquid level control in the vacuum crystallizer, thereby ensuring the effect of liquid level control in the vacuum crystallizer.

[0019] (2) This liquid level control device also includes a stirring mechanism, which is set in the overflow tank. Since the slurry discharged from the crystallization pot to the overflow tank through the discharge pipe is a slurry after cooling and crystallization, a stirring mechanism is set in the overflow tank to stir the slurry in the overflow tank, thereby preventing the slurry in the overflow tank from settling and affecting the flow performance of the slurry. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements.

[0021] Figure 1 This is a schematic diagram of the structure of a vacuum crystallizer liquid level control device according to an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of Comparative Example 1 of the present utility model;

[0023] Figure 3 This is a structural schematic diagram of Comparative Example 2 of the present utility model.

[0024] In the diagram: 1. Crystallization pot; 11. Steam outlet; 12. Discharge port; 13. Feed inlet; 2. Discharge pipe; 3. Overflow trough; 31. Overflow outlet; 4. Storage tank; 5. Feed pipe; 6. Feed pump; 7. Liquid level sensor; 8. Discharge pump; 9. Sleeve. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] like Figure 1 As shown in the figure, a vacuum crystallizer liquid level control device of this utility model embodiment is provided. The vacuum crystallizer includes a crystallization pot 1 and a discharge pipe 2. The crystallization pot 1 has an extremely high vacuum, which causes part of the water in the liquid in the crystallization pot 1 to evaporate. The evaporated water takes away the heat of the liquid, thereby realizing the cooling and crystallization of the liquid. The discharge pipe 2 discharges the cooled and crystallized liquid in the crystallization pot 1.

[0027] Specifically, the top of the crystallization pot 1 is equipped with a steam outlet 11, which is connected to a vacuum pump via a pipe. The vacuum pump draws out the water vapor formed after some of the water in the liquid material in the crystallization pot 1 evaporates, thereby removing the heat from the liquid material and achieving cooling and crystallization. At the same time, it maintains the vacuum level inside the crystallization pot 1, ensuring that the crystallization pot 1 can continuously cool and crystallize the input liquid material. The bottom of the crystallization pot 1 is equipped with a discharge port 12, and the top end of the discharge pipe 2 is connected to the discharge port 12, while the bottom end extends downward, so that the cooled liquid material in the crystallization pot 1 is discharged through the discharge port 12 and the discharge pipe 2.

[0028] In this embodiment, the liquid level control device includes an overflow tank 3, which is located below the crystallization pot 1. The bottom end of the discharge pipe 2 extends into the overflow tank 3, so that the cooled liquid in the crystallization pot 1 is discharged into the overflow tank 3 through the discharge port 12 and the discharge pipe 2.

[0029] Specifically, in actual implementation, the overflow tank 3 in this patent can be a cavity formed inside a container such as a tubular container, bottle-shaped container, or can. The upper part of the overflow tank 3 is provided with an overflow port 31. When the bottom end of the discharge pipe 2 extends into the overflow tank 3, it is lower than the overflow port 31. Therefore, when the discharge pipe 2 discharges the liquid into the overflow tank 3, the bottom end of the discharge pipe 2 is below the liquid surface.

[0030] When the liquid level in the overflow tank 3 reaches the height of the overflow port 31, it automatically flows out from the overflow port 31, thereby maintaining the liquid level in the overflow tank 3 at the height of the overflow port 31. By controlling the liquid level in the overflow tank 3, the liquid level in the crystallization pot 1 is controlled, so that the liquid level in the crystallization pot 1 is maintained at a specified height.

[0031] Specifically, the principle by which this liquid level control device controls the liquid level in the crystallization pot 1 by controlling the liquid level in the overflow tank 3 is as follows:

[0032] Since the overflow tank 3 is connected to the outside through the overflow port 31, the pressure difference between the liquid level in the crystallizing pot 1 and the liquid level in the overflow tank 3 is equal to the local atmospheric pressure minus the absolute pressure inside the crystallizing pot 1. The pressure difference between the liquid level in the crystallizing pot 1 and the liquid level in the overflow tank 3 is set as... The local atmospheric pressure is The absolute pressure inside crystallization pot 1 is ,Right now .

[0033] The difference between the liquid level in the crystallizing pot 1 and the liquid level in the overflow tank 3 is set as follows: Set the liquid level in crystallization pot 1 to [the desired height]. The liquid level in overflow tank 3 is [missing information]. ,Right now .according to It can be seen that the pressure difference between the liquid level in the crystallization pot 1 and the liquid level in the overflow tank 3 is equal to the difference between the liquid level in the crystallization pot 1 and the liquid level in the overflow tank 3 × × ,Right now .

[0034] Therefore, we can conclude that: ,in, The local atmospheric pressure is a known value. The absolute pressure inside the crystallization pot 1 is as described above: the steam outlet 11 at the top of the crystallization pot 1 is connected to a vacuum pump through a pipe. The vacuum pump is used to extract the water vapor inside the crystallization pot 1 and maintain the vacuum level inside the crystallization pot 1. Therefore, it is also a definite value. The density of the liquid is related to the liquid itself. is the gravitational constant, and is a definite value.

[0035] According to the formula above, in , , , With all values ​​being fixed, the liquid level in the overflow tank 3 is controlled. This allows for the control of the liquid level in the crystallization pot 1. To take control.

[0036] For example: This vacuum crystallizer is used for the crystallization of titanium liquid, and the density of the titanium liquid... 1480kg / m 3Gravitational constant It is 9.8 N / kg, local atmospheric pressure The absolute pressure inside crystallization pot 1 is 86000 Pa, the crystallization temperature controlled in the continuous production process is 19℃. If the pressure is 1100 Pa, then the difference between the liquid level in the crystallization pot 1 and the liquid level in the overflow tank 3 is set to... = (86000 - 1100) / (9.8 * 1480) = 5.85m. Therefore, the liquid level in the overflow tank 3 is determined. Then, the liquid level of the liquid in crystallization pot 1 was determined. , Is 5.85m above.

[0037] Comparative Example 1:

[0038] like Figure 2 As shown, a steam outlet 11 and a liquid level sensor 7 are provided at the top of the crystallization pot 1. The liquid level sensor 7 is used to detect the liquid level information of the crystallization pot 1 and output a signal. A discharge port 12 is provided at the bottom of the crystallization pot 1. The discharge port 12 is connected to the discharge pump 8 through a pipe.

[0039] The liquid level control method of the comparative example is as follows: the liquid level information of the liquid in the crystallization pot 1 is obtained in real time by the liquid level sensor 7, and the corresponding switch signal is output to control the pumping speed of the discharge pump 8, thereby adjusting the liquid level of the liquid in the crystallization pot 1.

[0040] In actual operation, this method has the following problems: Since the crystallization pot 1 is a high vacuum container and the liquid in the crystallization pot 1 boils violently, the generated droplets can easily interfere with the liquid level measurement accuracy of the liquid level sensor 7, and cannot output the correct liquid level information signal. This results in the pumping speed of the discharge pump 8 not being adjusted in time, which causes the liquid level in the crystallization pot 1 to rise instantly. A large amount of droplets and liquid are sprayed out from the steam outlet 11, causing a major production failure.

[0041] Comparative Example 2:

[0042] like Figure 3 As shown, a steam outlet 11 is provided at the top of the crystallization pot 1, and a discharge outlet 12 is provided at the bottom. A sleeve 9 is provided below the crystallization pot 1. The top end of the discharge pipe 2 is connected to the discharge outlet 12, and the bottom end is connected to the sleeve 9, so that the liquid in the crystallization pot 1 is discharged into the sleeve 9, and the bottom end of the discharge pipe 2 extends below the liquid surface of the material in the sleeve 9. A liquid level sensor 7 is provided on the side wall of the sleeve 9, and a discharge outlet is provided at the bottom of the sleeve 9. The discharge outlet is connected to the discharge pump 8 through a pipe.

[0043] The comparative liquid level control method is as follows: the liquid level sensor 7 acquires the liquid level information of the material liquid in the sleeve 9 in real time and outputs the corresponding switch signal to control the pumping speed of the discharge pump 8, thereby adjusting the liquid level of the material liquid in the sleeve 9, and then controlling the liquid level of the material liquid in the crystallization pot 1 by controlling the liquid level of the material liquid in the sleeve 9.

[0044] Since the sleeve 9 operates under normal pressure, the material will not boil, thus preventing material droplets from interfering with the liquid level measurement accuracy of the liquid level sensor 7. This improves the liquid level control accuracy of the liquid in the crystallizing pot 1 and prevents major production failures.

[0045] Although Comparative Example 2 is an improvement on Comparative Example 1, which can prevent the liquid in the crystallizing pot 1 from boiling violently and generating spray that interferes with the liquid level measurement accuracy of the liquid level sensor 7, both Comparative Example 2 and Comparative Example 1 use the method of the liquid level sensor 7 and the discharge pump 8 working together to control the liquid level in the vacuum crystallizer.

[0046] In actual implementation, since the liquid level sensor 7 is an electrical component, it is prone to malfunction or damage during use. The discharge pump 8 requires precise flow control through algorithms to coordinate the cooperation between multiple components, which is complex and has low stability. This results in poor reliability of liquid level control in the vacuum crystallizer, thus affecting the effectiveness of liquid level control in the vacuum crystallizer.

[0047] And such Figure 1 As shown and as described above, this patent does not require control components such as liquid level sensor 7 and discharge pump 8. It only requires an overflow port 31 at the top of the overflow tank 3 and the bottom end of the discharge pipe 2 extending below the overflow port 31 in the overflow tank 3. When the liquid level in the overflow tank 3 reaches the height of the overflow port 31, it automatically flows out from the overflow port 31, thereby realizing the liquid level control of the liquid in the overflow tank 3. In turn, by controlling the liquid level in the overflow tank 3, the liquid level in the crystallization pot 1 can be controlled.

[0048] Therefore, compared with Comparative Example 1 and Comparative Example 2, the structure of this liquid level control device is simpler and can improve the reliability of liquid level control in the vacuum crystallizer, thereby ensuring the effectiveness of liquid level control in the vacuum crystallizer.

[0049] Example 1:

[0050] In this embodiment, the liquid level control device further includes a receiving tank and an overflow pipe, one end of which is connected to the overflow port 31 and the other end is connected to the receiving tank. Figure 1(Not shown in the image). When the liquid level in the overflow tank 3 reaches the height of the overflow port 31, it automatically flows out from the overflow port 31. The liquid flowing out of the overflow port 31 flows through the overflow pipe and enters the receiving tank for storage, so as to facilitate subsequent liquid processing.

[0051] Specifically, in actual implementation, the receiving trough in this patent can be a cavity formed inside a container such as a tubular container, bottle-shaped container, or can. It is foreseeable that in this patent, the receiving trough is an open structure, or has a connecting port that communicates with the outside, so as to ensure that the pressure at the discharge end of the overflow trough 3 is atmospheric pressure.

[0052] Example 2:

[0053] In this embodiment, the overflow port 31 is an opening located on the upper side wall of the overflow tank 3. As mentioned in the above embodiment, the overflow tank 3 can be a cavity formed inside a container such as a tubular container, bottle-shaped container, or can-shaped container, that is, the overflow port 31 is an opening opened on the side wall of the container such as a tubular container, bottle-shaped container, or can-shaped container.

[0054] This opening connects the containing cavity of tubular, bottle-shaped, or canned containers to the outside, so that when the liquid level in the containing cavity reaches the height of the overflow port 31, it automatically flows out from the overflow port 31, thereby maintaining the liquid level in the overflow tank 3 at the height of the overflow port 31. In turn, by controlling the liquid level in the overflow tank 3, the liquid level in the crystallization pot 1 is controlled, so that the liquid level in the crystallization pot 1 is maintained at a specified height.

[0055] Example 3:

[0056] In this embodiment, the overflow port 31 is an opening located at the top of the overflow tank 3. As mentioned in the above embodiments, the overflow tank 3 can be a cavity formed inside a container such as a tubular container, bottle-shaped container, or can-shaped container, that is, the overflow port 31 is an opening opened at the top of the container such as a tubular container, bottle-shaped container, or can-shaped container.

[0057] This opening connects the containing cavity of tubular, bottle-shaped, or canned containers to the outside, so that when the liquid level in the containing cavity reaches the height of the overflow port 31, it automatically flows out from the overflow port 31, thus maintaining the liquid level in the overflow tank 3 at the height of the overflow port 31, i.e., maintaining the liquid level in the overflow tank 3 at the height of the tubular, bottle-shaped, or canned containers. In turn, by controlling the liquid level in the overflow tank 3, the liquid level in the crystallization pot 1 is controlled, so that the liquid level in the crystallization pot 1 is maintained at a specified height.

[0058] In actual implementation, Embodiments 2 and 3 can be used alone or in combination with Embodiment 1. When Embodiment 2 is used in combination with Embodiment 1, one end of the overflow pipe is connected to the opening on the side wall of the overflow tank 3, and the other end is connected to the receiving tank, so that the liquid flowing out of the opening on the side wall of the overflow tank 3 flows through the overflow pipe and enters the receiving tank for storage, so as to facilitate subsequent liquid processing.

[0059] When Embodiment 3 is used in combination with Embodiment 1, one end of the overflow pipe is connected to the opening at the top of the overflow tank 3, and the other end is connected to the receiving tank, so that the liquid flowing out of the opening at the top of the overflow tank 3 flows through the overflow pipe and enters the receiving tank for storage, so as to facilitate the subsequent processing of the liquid.

[0060] In this embodiment, based on the principle that the liquid level control device controls the liquid level in the crystallization pot 1 by controlling the liquid level in the overflow tank 3, it can be known that: ,in , , , All of these are fixed values. Therefore, in actual implementation, the liquid level in the overflow tank 3 can be designed according to the liquid level required to be maintained in the crystallizing pot 1.

[0061] Specifically, since the liquid level in the overflow tank 3 is maintained at the height of the overflow port 31, the height of the overflow port 31 is set as... The required liquid level height to be maintained in crystallization pot 1 is set as follows: ,Right now ,in , , , All values ​​are fixed. Therefore, in actual operation, the liquid level in the overflow tank 3 can be maintained at a certain height by designing the height of the overflow port 31. This ensures that the liquid level in the crystallization pot 1 is maintained at the required height. .

[0062] In this embodiment, the side wall of the crystallization pot 1 is provided with a feed inlet 13. The vacuum crystallizer also includes a storage tank 4 and a feed pipe 5. The storage tank 4 is filled with liquid. One end of the feed pipe 5 is connected to the feed inlet 13 and the other end is connected to the storage tank 4, so that the liquid in the storage tank 4 is transported to the crystallization pot 1 through the feed pipe 5 to realize the feeding of the crystallization pot 1.

[0063] Furthermore, in this embodiment, the vacuum crystallizer also includes a feed pump 6, which is connected to the storage tank 4. The feed pump 6 provides power to drive the liquid in the storage tank 4 to be transported to the crystallization pot 1 through the feed pipe 5, thereby realizing the feeding of the crystallization pot 1.

[0064] As described above, the difference between the liquid level in crystallization pot 1 and the liquid level in overflow tank 3 is... To determine the value, when the feed pump 6 continuously supplies material to the crystallizing pot 1, the liquid in the overflow tank 3 flows out from the overflow port 31, causing the liquid level in the overflow tank 3 to be [higher than the specified value]. Maintain at This ensures the liquid level of the material in crystallizing pot 1. Maintain at .

[0065] When the feed pump 6 stops operating and stops feeding material into the crystallizing pot 1, under atmospheric pressure, the liquid in the overflow tank 3 stops flowing out of the overflow port 31, causing the liquid level in the overflow tank 3 to drop to a certain height. Continue to maintain at This ensures the liquid level of the material in crystallizing pot 1. Continue to maintain at This ensures the working performance of crystallization pot 1.

[0066] Furthermore, in this embodiment, the liquid level control device also includes a stirring mechanism, which is disposed in the overflow tank 3. Figure 1 (Not shown in the image). Since the slurry discharged from the crystallization pot 1 to the overflow tank 3 through the discharge pipe 2 is the slurry after cooling and crystallization, a stirring mechanism is provided in the overflow tank 3 to stir the slurry in the overflow tank 3, thereby preventing the slurry in the overflow tank 3 from settling and affecting the flow performance of the slurry.

[0067] Specifically, in actual implementation, the stirring mechanism can be a stirring fan blade, stirring paddle, etc. installed in the overflow trough 3. The height of the stirring fan blade, stirring paddle, etc. installed in the overflow trough 3 is lower than the bottom height of the discharge pipe 2 extending into the overflow trough 3, so as to prevent the operation of the stirring mechanism from interfering with the discharge pipe 2.

[0068] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0070] Finally, it should be noted that 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A liquid level control device for a vacuum crystallizer, the vacuum crystallizer comprising a crystallization pot (1) and a discharge pipe (2), the crystallization pot (1) being used to cool and crystallize the liquid material, and the discharge pipe (2) being used to discharge the cooled and crystallized liquid material from the crystallization pot (1); the top of the crystallization pot (1) is provided with a steam outlet (11), and the bottom is provided with a discharge port (12), the top end of the discharge pipe (2) being connected to the discharge port (12), and the bottom end extending downward, characterized in that: The system includes an overflow trough (3) located below the crystallization pot (1). The upper part of the overflow trough (3) is provided with an overflow port (31). The bottom end of the discharge pipe (2) extends into the overflow trough (3) and is lower than the overflow port (31). Thus, when the liquid level in the overflow trough (3) reaches the height of the overflow port (31), it automatically flows out from the overflow port (31).

2. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The liquid level control device also includes a receiving tank and an overflow pipe. One end of the overflow pipe is connected to the overflow port (31) and the other end is connected to the receiving tank. Thus, the liquid flowing out of the overflow port (31) enters the receiving tank for storage after flowing through the overflow pipe.

3. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The overflow port (31) is an opening located on the upper side wall of the overflow trough (3).

4. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The overflow port (31) is an opening located at the top of the overflow trough (3).

5. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The height of the overflow port (31) Set to: ， In the formula: The required liquid level height to be maintained in the crystallization pot (1); The density of the liquid is related to the liquid itself. is the gravitational constant, and is a definite value; The local atmospheric pressure is a known value. The absolute pressure inside the crystallization pot (1) remains constant during the operation of the crystallization pot (1).

6. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The side wall of the crystallization pot (1) is provided with a feed inlet (13). The vacuum crystallizer also includes a storage tank (4) containing liquid material, and a feed pipe (5) with one end connected to the feed inlet (13) and the other end connected to the storage tank (4). Thus, the liquid material in the storage tank (4) is transported to the crystallization pot (1) through the feed pipe (5).

7. The vacuum crystallizer liquid level control device as described in claim 6, characterized in that: The vacuum crystallizer also includes a feed pump (6) connected to the storage tank (4), thereby the feed pump (6) drives the liquid in the storage tank (4) to be transported to the crystallization pot (1) through the feed pipe (5).

8. The vacuum crystallizer liquid level control device as described in claim 1, characterized in that: The liquid level control device also includes a stirring mechanism disposed in the overflow tank (3), which is used to stir the liquid in the overflow tank (3).

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