One-way valve and static crystallization equipment

Abstract

The invention relates to a one-way valve and static crystallization equipment. The one-way valve comprises a valve body and a valve cover which are hinged, a second rack and a first rack which are meshed with each other are arranged on the valve body and the valve cover respectively, and when the one-way valve is opened, a gap is formed between the second rack and the first rack. The valve body and the valve cover which are hinged are arranged, the second rack and the first rack which are meshed with each other are arranged on the valve body and the valve cover correspondingly, when the one-way valve is opened, a gap is formed between the second rack and the first rack, and the valve body can be sealed through cooperation of the second rack and the first rack; under the impact action of airflow, the valve cover and the valve body are repeatedly opened and closed, at the moment, a small gap is formed between the first rack and the second rack, gas overflows from the gap, the gap between the racks assists the gas in further reducing bubbles formed by the gas, more small bubbles are formed, the number and dispersity of the bubbles are increased, the crystallization time is shortened, and the crystallization efficiency is improved; the energy consumption is reduced and the finished product purity is improved.

Description

[0001] This application is a divisional application. The application number of the original application is 2025100173206, and the original application date is January 6, 2025. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of chemical equipment, and in particular to a one-way valve and a static crystallization device. Background Art

[0003] Crystallization is a typical chemical unit operation, which plays an important role in the separation and purification of products. In practical applications, crystallization methods can be divided into solution crystallization, melt crystallization, sublimation, reaction crystallization (or reaction precipitation), etc. Among them, melt crystallization is divided into two processes: crystallization and sweating. During the crystallization process, crystals are precipitated on the solid surface of the crystallizer or in the melt to obtain crude crystals. During the sweating process, the crude crystals obtained during the crystallization process are gradually heated up to discharge sweat and then the crude crystals are purified. Melt crystallization has the advantages of low energy consumption (energy consumption is 10%-30% of distillation), low pollution, no introduction of solvent (no additional solvent is required in the melt crystallization process), low operating temperature (the crystallization process is usually operated at normal pressure and low temperature), high product purity (purity can reach more than 99.9%), and a wide range of applications (can be used for complex systems such as azeotropes, systems with small boiling point differences such as isomers, and heat-sensitive systems). It is widely used in petrochemicals, fine chemicals, biochemicals, light industry, new materials, metallurgy, pharmaceuticals and other fields.

[0004] The static crystallizer is a hardware device used for static melt crystallization. It uses the difference in solubility of substances in the molten state to gradually reduce the temperature of the shell-side heat exchange medium, so that the molten material standing in the tube side is gradually cooled down and crystallized to obtain coarse crystals. The unsolidified low-concentration residual liquid is then discharged, and the temperature of the coarse crystals in the tube side is slowly increased through the shell-side medium to make them "sweat" and further purify the coarse crystals. However, when using a static crystallizer to purify materials, the materials to be purified are in a static state during the melt crystallization process, the crystallization core is difficult to form, the crystallization time is long, the crystallization efficiency is low, the energy consumption is high, and the purity of the obtained finished product needs to be further improved. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the present invention provides a one-way valve and a static crystallization device to solve the technical problems of using a static crystallizer to purify materials, the material to be purified is in a static state during the melt crystallization process, the formation of crystal cores is difficult, the crystallization time is long, the crystallization efficiency is low, the energy consumption is high, and the purity of the finished product needs to be further improved.

[0006] To achieve the above objectives, the scheme of this application is as follows: In a first aspect, the present invention provides a one-way valve, comprising a hinged valve body and a valve cover, wherein the valve body and the valve cover are respectively provided with a second rack and a first rack that mesh with each other, and when the one-way valve is opened, a gap is formed between the second rack and the first rack.

[0007] Specifically, the present invention provides a hinged valve body and a valve cover, and a second rack and a first rack that mesh with each other are respectively provided on the valve body and the valve cover. When the one-way valve is opened, a gap is formed between the second rack and the first rack, and the valve body can be sealed by the mutual cooperation of the second rack and the first rack. When the airflow impacts the valve cover, the impact of the airflow causes the valve cover and the valve body to open and close repeatedly. At this time, a tiny gap is formed between the first rack and the second rack, and the gas overflows from the gap. The bubbles formed by the assisting gas in the gap between the racks are further reduced, forming more tiny bubbles, and the number and dispersion of the bubbles are increased (the increase in dispersion means that for bubbles of the same volume, the volume of a single bubble becomes smaller due to the increase in the number, and the actual coverage range is larger), thereby shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product.

[0008] Optionally, the first rack is located on an opposite side of the hinged corresponding side of the valve cover.

[0009] Optionally, a plurality of second racks and first racks meshing with each other are respectively provided on the valve body and the valve cover, and all the second racks are arranged in parallel, and all the first racks are arranged in parallel.

[0010] Optionally, a baffle is provided at the inner edge of the second rack located on at least one of the two sides.

[0011] Specifically, the present invention adds a baffle at the side wall edge of the second rack located on at least one of the two sides, which can resist the airflow through the baffle, reduce the airflow passing through the corresponding second rack, shrink the bubbles here, promote the formation of more tiny bubbles, increase the number and density of bubbles, enhance the disturbing effect of bubbles on the material, thereby shortening the crystallization time, improving crystallization efficiency, reducing energy consumption, and improving the purity of the finished product.

[0012] Optionally, along the direction from the middle to the two sides, the tooth pitch of two adjacent first racks gradually increases.

[0013] Specifically, along the direction from the middle to the two sides, the present embodiment sets the pitch of the two adjacent first racks to gradually increase, so that when the airflow impacts the valve cover, the gap between the first rack and the second rack on the corresponding side can be reduced, so that the bubbles formed by the auxiliary gas become smaller, thereby promoting the formation of more bubbles, increasing the number and density of bubbles, and enhancing the disturbing effect of the bubbles on the material, thereby shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product.

[0014] In a second aspect, the present invention also provides a static crystallization device using the one-way valve as described above, the static crystallization device comprising a shell and a gas delivery structure, one end of the one-way valve is connected to the gas delivery mechanism through a pipeline, and the other end is connected to the interior of the shell, for blowing bubbles into the material in the shell.

[0015] Specifically, the present invention adds a one-way valve, and one end of the one-way valve is connected to the gas delivery mechanism through a pipeline, and the other end is connected to the inside of the shell, so that auxiliary gases such as nitrogen can be introduced into the shell through the gas delivery mechanism, and the auxiliary gases such as nitrogen are formed into tiny bubbles through the one-way valve. The tiny bubbles formed by the auxiliary gases such as nitrogen enter the shell and disturb the material in a static state, accelerate the formation of crystallization cores, and then promote the material to accelerate nucleation, shorten the crystallization time, improve the crystallization efficiency, reduce energy consumption, and improve the purity of the finished product. The disturbing effect of the bubbles reduces the possibility of impurities entrained in the crystals formed during the melt crystallization process, and further improves the purity of the finished product.

[0016] Optionally, the static crystallization equipment also includes a bubbling mechanism and a plurality of crystallization plates arranged vertically inside the shell, the bubbling mechanism includes a bubbling tube and a bubble distribution network, one end of the bubbling tube is connected to the gas delivery mechanism, the bubble distribution network is located in the shell, the bubble distribution network includes a main pipe and a plurality of branch pipes connected to the main pipe, the main pipe is connected to the bubbling tube, the plurality of branch pipes are evenly distributed between the crystallization plates, and the branch pipe is provided with a one-way valve as described in any one of claims 1 to 5.

[0017] Optionally, the plurality of branch pipes include a plurality of primary branch pipes and a plurality of secondary branch pipes, the main pipe is connected to a plurality of vertically or horizontally arranged primary branch pipes, each of the primary branch pipes is connected to a plurality of vertically or horizontally arranged secondary branch pipes, the main pipe and / or the primary branch pipe and / or the secondary branch pipe are provided with a plurality of bubbling ports, and each bubbling port is provided with a one-way valve as described above.

[0018] Optionally, the bubbling port is arranged horizontally or inclined.

[0019] Specifically, the present invention can introduce bubbles formed by auxiliary gases such as nitrogen into the periphery of the crystallization plate by arranging the bubbling port horizontally or obliquely, which is more conducive to the formation of crystals on the plates of the crystallization plate, promotes the growth of crystals along the plates, and further shortens the crystallization time, improves the crystallization efficiency, reduces energy consumption, and improves the purity of the finished product. The disturbance effect of the bubbles reduces the possibility of impurities entrained in the crystals formed during the melt crystallization process, thereby further improving the purity of the finished product.

[0020] Optionally, the angle between the bubbling port and the crystallization plate is 45-90°.

[0021] Specifically, the present invention can enhance the disturbing effect of bubbles formed by auxiliary gases such as nitrogen on the material by setting the angle between the bubbling port and the crystallization plate to 45-90 degrees, reduce the possibility of crystals formed during the melt crystallization process carrying impurities, and further improve the purity of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the valve cover in Example 1; Figure 2 It is a structural schematic diagram of the valve body in Example 1; Figure 3 is a schematic structural diagram of the valve body in Example 2; Figure 4 It is a schematic structural diagram of the static melt crystallization equipment of Example 3; Figure 5 for Figure 4 Schematic cross-section of the static crystallizer (AA direction); Figure 6 for Figure 4 Schematic diagram of the cross section of the bubble distribution structure (BB direction); Figure 7 for Figure 4 Schematic cross-section of the middle bubbler port (CC direction); Figure 8 This is a schematic cross-sectional view of the static crystallizer in Example 4 (AA direction).

[0024] Reference numerals 1- one-way valve, 11- valve cover, 111- first rack, 112- second rack, 1121- baffle; 2-shell, 21-material inlet, 22-second heat transfer medium inlet, 23-auxiliary gas inlet, 24-heat transfer medium outlet, 25-supercooling liquid inlet, 26-supercooling liquid outlet, 27-material outlet, 28-first heat transfer medium inlet, 29-first heat transfer medium outlet; 3- Crystallization plate; 4-bubble tube; 5- Jacket; 6- sight glass; 71-main pipe, 72-first branch pipe, 73-second branch pipe, 74-bubble port. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] One embodiment of the present invention provides a one-way valve 1, including a hinged valve body and a valve cover 11, and the valve body and the valve cover 11 are respectively provided with a plurality of second racks 112 and a plurality of first racks 111 that mesh with each other, all the second racks 112 are arranged in parallel, and all the first racks 111 are arranged in parallel. When the one-way valve is opened, a gap is formed between the second racks 112 and the first racks 111, and the first racks 111 are located on the opposite side of the corresponding hinged side of the valve cover 11, and along the direction from the middle to the two sides, the tooth pitch of two adjacent first racks 111 gradually increases.

[0030] In another embodiment of the present invention, a baffle 1121 is disposed at the inner edge of the second rack 112 on at least one of the two sides.

[0031] One embodiment of the present invention provides a static crystallization device using the one-way valve 1, the static crystallization device includes a shell 2 and a gas delivery structure, one end of the one-way valve 1 is connected to the gas delivery mechanism through a pipeline, and the other end is connected to the inside of the shell 2, and is used to inject bubbles into the material in the shell 2; The static crystallization equipment also includes a bubbling mechanism and a plurality of crystallization plates 3 arranged vertically inside the shell, the bubbling mechanism includes a bubbling tube 4 and a bubble distribution network, one end of the bubbling tube 4 is connected to the gas delivery mechanism, the bubble distribution network is located in the shell 2, the bubble distribution network includes a main pipe 71 and a plurality of level branches connected to the main pipe 71, the main pipe 71 is connected to the bubbling tube 4, and the plurality of level branches are evenly distributed between the crystallization plates 3, the main pipe 71 is connected to a plurality of vertically or horizontally arranged first-level branches 72, each of the first-level branches 72 is connected to a plurality of vertically or horizontally arranged second-level branches 73, the main pipe 71 and / or the first-level branch pipe 72 and / or the second-level branch pipe 73 are provided with a plurality of bubbling ports 74, each of the bubbling ports 74 is provided with a one-way valve 1 as described above, the bubbling ports 74 are arranged horizontally or obliquely, and preferably, the angle between the bubbling ports 74 and the crystallization plate 3 is 45-90°.

[0032] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0033] Example 1 See also Figure 1 , Figure 1 This is a schematic structural diagram of the one-way valve 1 of the present application. The one-way valve 1 includes a valve body 12 and a valve cover 11 hinged to the valve body 12. A valve core (not shown) is provided in the valve body 12. An inlet end and an outlet end are respectively provided at both ends of the valve body 12.

[0034] See also Figure 1 and Figure 2 The outlet end of the valve body 12 is provided with a valve cover 11, one side of the valve cover 11 is hinged to the valve body 12, a local area of ​​the valve cover 11 is provided with a plurality of first racks 111 arranged in parallel, the local area is located on the opposite side of the hinged corresponding side of the valve cover 11, and the valve body 12 is provided with a second rack 121 matched with the first rack 111. Along the direction from the middle to the two sides, the tooth pitch of two adjacent first racks 111 gradually increases.

[0035] Specifically, along the direction from the middle to the two sides, the present embodiment sets the pitch of the two adjacent first racks 111 to gradually increase, so that when the airflow impacts the valve cover, the gap between the first rack 111 and the second rack 112 on the corresponding side can be reduced, so that the bubbles formed by the auxiliary gas become smaller, and more bubbles are formed, the number and density of bubbles are increased, and the disturbance effect on the material is enhanced, thereby shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product.

[0036] The principle of the one-way valve of the present embodiment is as follows: the present embodiment provides a hinged valve body 12 and a valve cover 11, and a second rack 112 and a first rack 111 that mesh with each other are provided on the valve body 12 and the valve cover 11 respectively. When the one-way valve 1 is opened, a gap is formed between the second rack 112 and the first rack 111, and the valve body can be sealed by the mutual cooperation of the second rack 112 and the first rack 111. When the airflow impacts the valve cover, the impact of the airflow causes the valve cover and the valve body to open and close repeatedly. At this time, a tiny gap is formed between the first rack and the second rack, and the gas overflows from the gap. The gap between the racks assists the bubbles formed by the gas to become smaller, forming more tiny bubbles, and the number and dispersion of the bubbles increase (the increase in dispersion means that for bubbles of the same volume, the volume of a single bubble becomes smaller due to the increase in the number, and the actual coverage range is larger), thereby shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product. At the same time, the reciprocating motion of the valve cover 12 during repeated opening and closing can scrape off the crystals to prevent the crystals from clogging the one-way valve.

[0037] Example 2 See also Figure 3 The difference between this embodiment and embodiment 1 is that a baffle 1211 is provided at the inner edge of the second rack 121 located on at least one of the two sides, and a gap is left between the baffle 1211 and the adjacent second rack 121, that is, a gap is left between the baffle 1211 and the adjacent second rack 121 provided with the baffle.

[0038] Specifically, in this embodiment, a baffle 1211 is added to the side wall edge of the second rack 112 located on at least one of the two sides. The baffle 1211 can resist the airflow, reduce the airflow passing through the second rack 112 located on the corresponding side, shrink the bubbles here, promote the formation of more tiny bubbles, increase the number and density of bubbles, enhance the disturbance effect on the material, thereby shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product.

[0039] Example 3 See also Figures 4 to 7This embodiment provides a static melt crystallization device using the one-way valve of Example 2, and the static melt crystallization device includes a static crystallizer, a gas delivery structure and a bubbling mechanism. The gas delivery structure is used to deliver auxiliary gases such as nitrogen into the static crystallizer, and the bubbling mechanism is used to form bubbles of auxiliary gases such as nitrogen. The bubbling mechanism includes a bubbling tube 4 and a bubble distribution network.

[0040] Please continue reading Figures 4 to 7 The static crystallizer includes a shell 2, a material inlet 21, a first heat transfer medium inlet 22, an auxiliary gas inlet 23, a second heat transfer medium inlet 28, a first heat transfer medium outlet 24, a second heat transfer medium outlet 29, a supercooled liquid inlet 25 and a supercooled liquid outlet 26 are provided at the top of the shell 2, and a material outlet 26 is provided at the bottom of the shell 2. A flow regulating valve (not shown) and a temperature regulating assembly (not shown) are provided at the first heat transfer medium inlet 22 and the second heat transfer medium inlet 28. A heat transfer medium distributor (not shown) is provided between the first heat transfer medium inlet 22 and the crystallization plate 3. The material inlet 21, the first heat transfer medium inlet 22, the auxiliary gas inlet 23, the supercooled liquid inlet 25 and the second heat transfer medium inlet 28 are respectively used as inlets for the material to be purified, the first heat transfer medium, the auxiliary gas, the supercooled liquid and the second heat transfer medium to enter the shell 2. The second heat transfer medium outlet 24, the material outlet 27, the supercooled liquid outlet 26 and the second heat transfer medium outlet 29 are respectively used as outlets for the heat transfer medium, the purified material, the supercooled liquid and the second heat transfer medium to be discharged from the shell 2. The first heat transfer medium inlet 22 and the first heat transfer medium outlet 24 are connected to a first heat transfer medium storage container (not shown) to form a first heat exchange mechanism. The first heat exchange mechanism is used to control the temperature of the material to be purified. The temperature of the material to be purified is controlled by heat exchange between the first heat transfer medium and the material to be purified. A sight glass 6 for observing the state of the material is provided on the upper side of the housing 2 .

[0041] See also Figures 4 to 7, a plurality of crystallization plates 3 are arranged between the material inlet 21 and the material outlet 26, all the crystallization plates 3 are arranged in parallel along the vertical direction, the crystallization plates 3 are connected to the first heat transfer medium inlet 22 and the first heat transfer medium outlet 24, the auxiliary gas inlet 23 is connected to the bubbling tube 4, the bubbling tube 4 and the bubble distribution pipe network are both covered with a jacket 5, the jacket 5 is provided with a jacket inlet and a jacket outlet, the jacket inlet is connected to the second heat transfer medium inlet 28 and the supercooled liquid inlet 25, and the jacket outlet 29 is connected to the second heat transfer medium outlet 29 and the supercooled liquid outlet 26. The second heat transfer medium inlet 28 and the second heat transfer medium outlet 29 are connected to the second heat transfer medium storage container (not shown), and the supercooled liquid inlet 25 and the supercooled liquid outlet 26 are connected to the supercooled liquid storage container (not shown), so as to form a second heat exchange mechanism, and the second heat exchange mechanism controls the temperature of the auxiliary gas through heat exchange between the second heat transfer medium, the supercooled liquid and the auxiliary gas, so that the auxiliary gas is kept consistent with the temperature of the material to be purified. One end of the bubbling tube 4 is connected to the gas delivery mechanism, and the other end is connected to the inside of the shell 2, and is used to bubble bubbles into the material to be purified in the shell 2. The bubble distribution pipe network includes a main pipe 71 and a plurality of branch pipes 72 connected to the main pipe 71, the main pipe 71 is connected to the bubbling tube 4, and the plurality of branch pipes 72 are evenly distributed between the crystallization plates 3. The main pipe 71 and / or the branch pipe 72 are provided with a plurality of bubbling ports, and each bubbling port is provided with a one-way valve 1. The bubble distribution network is located in the shell 2, and the bubble distribution network includes a main pipe 71 and several level branches connected to the main pipe. The main pipe 71 is connected to the bubbling pipe 4, and the several level branches 72 are evenly distributed between the crystallization plates 3. The several level branches include several primary branches 72 and several secondary branches 73. The main pipe 71 is connected to several vertically or horizontally arranged primary branches 72, and each of the primary branches 72 is connected to several vertically or horizontally arranged secondary branches 73. The main pipe 71 and / or the primary branch pipe 72 and / or the secondary branch pipe 73 are provided with several bubbling ports 74, each of which is provided with a one-way valve 1. The bubbling ports are arranged horizontally or inclined. Preferably, the angle between the bubbling ports 74 and the crystallization plate 3 is 45-90°.

[0042] Specifically, the present embodiment, by adding a one-way valve 1 at the bubbling port 74, can prevent the material from being sucked back into the bubbling tube while avoiding the risk of crystallization blockage in the bubbling tube 4. The present embodiment, by setting the bubbling port 74 horizontally or obliquely, can introduce bubbles formed by auxiliary gases such as nitrogen into the plate around the crystallization plate, which is more conducive to the material forming crystals on the plate of the crystallization plate, promoting the growth of crystals along the plate, and further shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, improving the purity of the finished product, and reducing the possibility of crystals formed in the melt crystallization process carrying impurities through the disturbing effect of bubbles, and further improving the purity of the finished product. The present embodiment, by setting the angle between the bubbling port 74 and the crystallization plate 3 to 45-90 °, can enhance the disturbing effect of bubbles formed by auxiliary gases such as nitrogen on the material to reduce the possibility of crystals formed in the melt crystallization process carrying impurities, and further improve the purity of the finished product. The present embodiment, by adding a sight glass 6 for observing the state of the material on the upper side of the shell 2, is convenient for observing the state of the material through the sight glass 6, and then adjusting the flow of the auxiliary gas according to the observed state of the material. This embodiment can control the temperature of the auxiliary gas by adding a second heat exchange mechanism, so that it is consistent with the temperature of the material to be purified or lower than the temperature of the material to be purified (even if the auxiliary gas is supercooled). Then, during the crystallization process, the gas bubbling is used to disturb the airflow of the material to accelerate crystal nucleation, or the supercooling degree is increased by the supercooled gas and the supercooled heat-conducting medium in the jacket of the bubbling pipe to promote the nucleation of crystals near the bubbling pipe, thereby accelerating crystal growth, shortening the crystallization time, and reducing energy consumption.

[0043] The principle of this embodiment is as follows: by adding a gas delivery structure and a bubbling mechanism, the bubbling mechanism is configured to include a bubbling tube 4, one end of the bubbling tube 4 is connected to the gas delivery mechanism, and the other end of the bubbling tube 4 is connected to the interior of the shell 2, and auxiliary gases such as nitrogen can be introduced into the bubbling tube 4 through the gas delivery mechanism, and the auxiliary gases such as nitrogen are formed into bubbles through the bubbling mechanism. During the crystallization process of the material to be purified, the bubbles formed by the auxiliary gases such as nitrogen enter the vicinity of the crystallization plate 3 and cause disturbances to the material in a static state, thereby accelerating the formation of crystallization cores, thereby prompting the material to accelerate nucleation, shortening the crystallization time, improving the crystallization efficiency, reducing energy consumption, and improving the purity of the finished product. The disturbing effect of the bubbles reduces the possibility of impurities entrained in the crystals formed during the melt crystallization process, thereby further improving the purity of the finished product.

[0044] The process of purifying the material to be purified using the static crystallization equipment of this embodiment is as follows: At the beginning of the crystallization process, the jacket inlet is connected to the second heat transfer medium inlet, and the jacket outlet is connected to the second heat transfer medium outlet. The second heat transfer medium (hot water, etc.) in the jacket 5 and the first heat transfer medium in the crystallization plate 3 are cooled synchronously, thereby reducing the temperature of the auxiliary gas such as nitrogen in the bubbling tube 4. During the cooling crystallization process, the inlet of the jacket 5 is switched to be connected to the supercooling liquid inlet, and the supercooling liquid (water with a lower temperature) provides local supercooling for the material in the shell 2, which is convenient for the crystallization of the material. The supercooling liquid is discharged from the supercooling liquid outlet after heat exchange with the material; After crystals are generated, the jacket inlet is switched to be connected to the second heat transfer medium inlet 28, and the jacket outlet is connected to the second heat transfer medium outlet 29. The second heat transfer medium in the jacket 5 and the first heat transfer medium in the crystallization plate 3 are cooled synchronously, which can increase the heat exchange area between the material and the heat transfer medium at the same time. After the crystallization process is completed, the introduction of auxiliary gas such as nitrogen into the bubbling tube 4 is stopped, and the temperature rising, sweating and melting steps are continued, and the obtained crystallized product is discharged from the material outlet 26.

[0045] Example 4 See also Figure 8 The difference between this embodiment and embodiment 2 is that the bubbling tube 4 and the bubble distribution official website are not covered with a jacket 5.

[0046] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A one-way valve, comprising a hinged valve body and a valve cover, characterized in that: The valve body and the valve cover are respectively provided with a second rack and a first rack that mesh with each other. When the one-way valve is opened, a gap is formed between the second rack and the first rack.

2. The one-way valve according to claim 1, characterized in that: The first rack is located on a side opposite to the hinged corresponding side of the valve cover.

3. The one-way valve according to claim 2, characterized in that: The valve body and the valve cover are respectively provided with a plurality of second racks and first racks that mesh with each other, all of the second racks are arranged in parallel, and all of the first racks are arranged in parallel.

4. The one-way valve according to claim 3, characterized in that: A baffle is provided at the inner edge of the second rack located on at least one of the two sides.

5. The one-way valve according to claim 3, characterized in that: Along the direction from the middle to the two sides, the tooth pitch between two adjacent first racks gradually increases.

6. A static crystallization device using the one-way valve according to any one of claims 1 to 5, characterized in that: The static crystallization equipment comprises a shell and a gas delivery structure. One end of the one-way valve is connected to the gas delivery mechanism through a pipeline, and the other end is connected to the inside of the shell for blowing bubbles into the material in the shell.

7. The static crystallization device according to claim 6, characterized in that The static crystallization equipment also includes a bubbling mechanism and a plurality of crystallization plates vertically arranged inside the shell, the bubbling mechanism includes a bubbling tube and a bubble distribution network, one end of the bubbling tube is connected to the gas delivery mechanism, the bubble distribution network is located in the shell, the bubble distribution network includes a main pipe and a plurality of branch pipes connected to the main pipe, the main pipe is connected to the bubbling tube, the plurality of branch pipes are evenly distributed between the crystallization plates, and the branch pipe is provided with a one-way valve as described in any one of claims 1 to 5.

8. The static crystallization device according to claim 7, characterized in that The plurality of branch pipes include a plurality of primary branch pipes and a plurality of secondary branch pipes, the main pipe is connected to a plurality of primary branch pipes arranged vertically or horizontally, each of the primary branch pipes is connected to a plurality of secondary branch pipes arranged vertically or horizontally, the main pipe and / or the primary branch pipe and / or the secondary branch pipe are provided with a plurality of bubbling ports, and each bubbling port is provided with a one-way valve as described in any one of claims 1 to 5.

9. The static crystallization device according to claim 8, characterized in that The bubbling port is arranged horizontally or inclined.

10. The static crystallization device according to claim 9, characterized in that The angle between the bubbling port and the crystallization plate is 45-90°.

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