Dry suction prevention filtering stirring shaft

Abstract

The invention relates to the technical field of stirring equipment, and particularly discloses an anti-dry suction filtering stirring shaft which comprises a hollow rotating shaft, the upper end and the lower end of the hollow rotating shaft are open, blades capable of rotating along with the hollow rotating shaft are arranged on the hollow rotating shaft, and a filtering head capable of filtering solid particles is arranged on the lower portion of the hollow rotating shaft. A sleeve is arranged outside the filter head, a gap is formed between the sleeve and the filter head, a top wall is arranged at the upper end of the sleeve, the lower end of the sleeve is open, and the hollow rotating shaft penetrates through the top wall and is sealed with the top wall. During use, liquid in solid-liquid mixed materials is pumped out through the filter head and the hollow rotating shaft, solid particles are intercepted, the sleeve is arranged outside the filter head and can prevent the dry pumping phenomenon caused when the liquid level is lowered, and the liquid is pumped out as much as possible.

Description

Technical Field

[0001] This invention relates to the field of mixing equipment technology, specifically to an anti-dry-extraction filter mixing shaft. Background Technology

[0002] Stirring shafts are commonly used in equipment such as reaction vessels and mixing tanks to agitate materials within the container, achieving uniform mixing, accelerated dissolution, and faster reactions. For solid-liquid mixtures requiring separation after agitation, existing technologies primarily employ the following methods: 1. Separating the liquid layer after solid-liquid stratification. The disadvantage of this method is that a significant amount of residual liquid remains in the separated solids. 2. Filtration or centrifugation. The disadvantage is the need for material transfer and the addition of filtration or centrifugation equipment, increasing operational steps. Currently, some stirring shafts can perform vacuum filtration of liquids in containers. For example, Chinese patent CN116510411A discloses an anti-gravity precipitation separation device for natural extracts. In this device, the stirring shaft is hollow, and a filter element is installed at the bottom. The clear liquid in the container can be extracted through the stirring shaft and filter element. However, this method has a problem: when the liquid level in the container is lower than the highest point of the filter element, the upper part of the filter element is above the liquid surface, allowing gas to enter the filter element. This can lead to dry-vacuuming of the filter element, leaving a significant amount of liquid remaining at the bottom of the container that cannot be extracted. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that when a stirring shaft with a filtration function in the prior art extracts liquid from a solid-liquid mixture, a large amount of liquid remains at the bottom of the container, and to provide a dry-dry filtration stirring shaft that can reduce the amount of liquid remaining at the bottom of the container.

[0004] To solve the above-mentioned technical problems, the present invention includes a hollow rotating shaft, both the upper and lower ends of which are open. The hollow rotating shaft is provided with blades that can rotate with it. The lower part of the hollow rotating shaft is provided with a filter head capable of filtering solid particles. The filter head is sleeved outside the lower open end of the hollow rotating shaft. Its structural features are: a sleeve is provided outside the filter head, a gap is provided between the sleeve and the filter head, the upper end of the sleeve has a top wall, and the lower end is open. The hollow rotating shaft passes through the top wall and is sealed to the top wall.

[0005] With the above structure, during use, the end with the filter head faces downwards, and the stirring shaft is vertically inserted into the bottom of the container. When the hollow shaft rotates, it drives the paddle to rotate, and the paddle stirs the solid-liquid mixture in the container. When the liquid in the solid-liquid mixture is extracted from the container, the hollow shaft stops rotating. The upper opening of the hollow shaft is connected to a suction pump through a pipe. When the suction pump is turned on, the liquid in the mixture enters the filter head through the pores on the surface of the filter head, and is then extracted through the hollow shaft. The solid particles are trapped by the filter head and remain in the container. Alternatively, liquid can be pumped into the container from the upper opening of the hollow shaft. The direction of liquid flow is opposite to that when it is extracted. When the liquid flows through the filter head, it washes off the solid particles attached to the surface of the filter head. Without an external sleeve for the filter head, when the liquid level in the container is lower than the highest point of the filter head, gas can pass through the pores on the filter head and enter the filter head. When the liquid level in the filter head is lower than the lower opening of the hollow rotating shaft, a dry-pumping phenomenon will occur, causing some residual liquid at the bottom of the container to be unable to be extracted. Because the filter head of this invention is equipped with an external sleeve, and the top wall of the sleeve is sealed with the hollow rotating shaft, when the liquid level in the container is lower than the highest point of the filter head, the area above the liquid level in the sleeve is under negative pressure, and its pressure is lower than the pressure above the liquid outside the sleeve. The liquid outside the sleeve will enter the gap between the sleeve and the filter head through the lower opening of the sleeve, and then pass through the pores on the filter head and enter the filter head. The liquid level inside the sleeve is higher than outside the sleeve, so that the liquid at the bottom of the container is extracted as much as possible, reducing the amount of residual liquid at the bottom of the container.

[0006] The lower end of the sleeve is open near the lowest point of the filter head, but not below it.

[0007] The lower end of the hollow shaft is open near the lowest point of the filter head.

[0008] The hollow rotating shaft is provided with a fixed plate, and the fixed plate is detachably and fixedly connected to the sleeve.

[0009] The blades are provided in at least two pieces and are mounted on the sleeve.

[0010] When the hollow shaft rotates in two different directions around its axis, the blades can open and close respectively.

[0011] The anti-dry-pull filter stirring shaft of the present invention has a filter head at the lower part of the hollow rotating shaft. When the hollow rotating shaft is inserted into the bottom of the solid-liquid mixture, the filter head filters the solid particles. The liquid can be drawn out through the filter head and the hollow rotating shaft, while the solid particles are filtered and retained by the filter head. By setting a sleeve on the outside of the filter head, the liquid at the bottom of the container is drawn out as much as possible, reducing the amount of liquid remaining at the bottom of the container. The blades of the stirring shaft can open and close. When the blades are open, they stir the material in the container. When the stirring shaft is put into or taken out of the container, the blades close, which facilitates the installation and disassembly of the stirring shaft. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 The A-view shows the blades in the open position, and the arrow indicates the direction of rotation of the hollow shaft. Figure 3 This is a schematic diagram of the blades when they are closed; the arrows indicate the direction of rotation of the hollow shaft. Figure 4 for Figure 2 A schematic diagram of the CC cross-section; Figure 5 for Figure 1 View from direction B; Figure 6 This is a schematic diagram of the blade structure; Figure 7 (a) is a schematic diagram of liquid extraction without a sleeve. Figure 7 (b) is a schematic diagram of the liquid extraction process when the sleeve is set up; In the diagram: 1. Hollow rotating shaft; 2. Filter head; 3. Sleeve; 31. Top wall; 32. Protruding section; 4. Blade; 41. Notched corner; 42. Recessed hole; 5. Fixing plate; 51. Collar; 6. Connecting column; 7. Upper fixing block; 8. Lower fixing block. Detailed Implementation

[0013] Reference Figure 1-7 This invention discloses an anti-dry-draft filter stirring shaft, used for stirring materials in a container and separating solid-liquid mixtures. The liquid in the solid-liquid mixture can be drawn out by the stirring shaft, while the solid particles remain in the container. The stirring shaft includes a hollow rotating shaft 1, with open upper and lower ends and a hollow cavity in the middle serving as a liquid channel. A paddle 4 is mounted on the hollow rotating shaft 1, rotating synchronously with it. When the paddle 4 is in the open state, it stirs the materials in the container. A filter head 2 for trapping solid particles is located at the lower part of the hollow rotating shaft 1, and the filter head 2 has pores on its wall. The mesh size of the pores is determined based on the particle size. The filter head 2 is fitted over the open lower end of the hollow rotating shaft 1. Liquid in the solid-liquid mixture enters the filter head 2 from the solution through its pores, and liquid can also enter the container from inside the filter head 2. Solid particles cannot pass through the pores of the filter head 2, thus remaining in the container. A sleeve 3 is provided on the hollow rotating shaft 1, fitted over the filter head 2 with a gap between it and the filter head 2. A top wall 31 is provided at the upper end of the sleeve 3, through which the hollow rotating shaft 1 passes and is sealed. The lower end of the sleeve 3 is open. The sleeve 3 reduces the amount of liquid remaining at the bottom of the container after extraction. If the sleeve 3 is not provided on the outside of the filter head 2, such as... Figure 7As shown in (a), when the liquid level in the solid-liquid mixture inside the container is lower than the highest point of the filter head 2, gas can enter the filter head 2 through the pores of the filter head 2. Gas and liquid outside the filter head 2 flow into the filter head 2 through the gaps between the solid particles. The resistance of the liquid flowing through the solid particles is greater than the resistance of the gas flowing through the solid particles. When the liquid level inside the filter head 2 drops to the open position at the lower end of the hollow rotating shaft 1, the speed at which the liquid is drawn out is greater than the speed at which the liquid enters the filter head 2 from the outside. At this time, a gas-liquid mixture is drawn out, which not only reduces the liquid discharge speed but also results in a large amount of residual liquid at the bottom of the container if suction is stopped at this point. By setting a sleeve 3 outside the filter head 2, such as... Figure 7 As shown in (b), the top of the gap between the sleeve 3 and the filter head 2 is under negative pressure, which is lower than the air pressure above the liquid level in the container. The liquid enters the gap between the sleeve 3 and the filter head 2 through the lower opening of the sleeve 3. When the liquid level outside the sleeve 3 is lower than the high point of the filter head 2, the liquid level in the gap between the sleeve 3 and the filter head 2 is higher than the liquid level outside the sleeve 3. Almost no gas enters the filter head 2, and the liquid outside the sleeve 3 can enter the filter head 2 more quickly, which increases the liquid discharge speed. When the liquid in the container is lower than the lower opening of the sleeve 3, the situation of not being able to extract liquid will occur. By setting the sleeve 3, the amount of liquid remaining at the bottom of the container when filtering through the hollow rotating shaft 1 is reduced.

[0014] Reference Figure 1 , 4The lower opening of sleeve 3 is close to the lowest point of filter head 2, but not lower than it. This is because materials in containers such as stirred reactors or tanks are generally discharged from the bottom. To ensure complete discharge, the bottom of the container is generally conical or arc-shaped, with the center point being the lowest. Sleeve 3 and filter head 2 are adapted to the shape of the container bottom. If the stirred reactor or tank has a flat bottom, the lower opening of sleeve 3 can be flush with or even lower than the lowest point of filter head 2. Sleeve 3 also provides some protection for filter head 2, reducing the compression of filter head 2 by solid particles. To extract as much liquid as possible from filter head 2, the lower opening of hollow shaft 1 is close to the lowest point of filter head 2. In the figure, filter head 2 is rod-shaped, but other shapes, such as spherical or elliptical, can also be used. The material of filter head 2 is selected according to the properties of the liquid in the container. If the liquid is corrosive, filter head 2 needs to be made of corrosion-resistant material, such as titanium. The sleeve 3 is connected to the hollow rotating shaft 1. Specifically, the hollow rotating shaft 1 has a fixed disc 5, and the fixed disc 5 has a downwardly protruding collar 51. The disc surface of the fixed disc 5 and the collar 51 are welded to the hollow rotating shaft 1. The shape of the fixed disc 5 and the collar 51 is similar to that of a necked flange. The top wall 31 of the sleeve 3 has an upwardly protruding section 32. The collar 51 is inserted into the protruding section 32, and the outer wall of the collar 51 fits against the inner wall of the protruding section 32. A sealing ring can also be set to increase the sealing performance. The fixed disc 5 and the protruding section 32 are fixedly connected by multiple bolts, so that the fixed disc 5 and the sleeve 3 are detachably fixedly connected. The filter head 2 is installed on the sleeve 3. Specifically, the lower surface of the top wall 31 of the sleeve 3 has an internal thread, and the filter head 2 has an external thread. The filter head 2 is screwed onto the sleeve 3.

[0015] Reference Figure 1-6 The propeller blade 4 has at least two blades, as shown in the figure, but three blades can also be used. The propeller blade 4 is mounted on the sleeve 3. When the hollow shaft 1 rotates in two different directions around its axis, the propeller blade 4 can open and close respectively. The two different directions of rotation mentioned here refer to clockwise and counterclockwise rotation. Figure 2 The image shows the blades 4 opening when the hollow shaft 1 rotates clockwise. Figure 3 The diagram shows the blade 4 closing when the hollow shaft 1 rotates counterclockwise; the reverse is also possible. Specifically, the blade 4 is mounted on the sleeve 3. The upper part of both sides of the sleeve 3 has an upper fixing block 7, and the lower part has a lower fixing block 8. Recessed holes 42 are provided on the upper and lower sides of one side of the blade 4. Connecting posts 6 connect the upper and lower sides of the blade 4 to the upper fixing block 7 and the lower fixing block 8 respectively. The connecting posts 6 are bolts. After being screwed to the upper fixing block 7, the bolts are inserted into the recessed holes 42 on the upper side of the blade 4, and after being screwed to the lower fixing block 8, they are inserted into the recessed holes 42 on the lower side of the blade 4. The diameter of the recessed holes 42 is larger than the outer diameter of the bolts, allowing the blade 4 to rotate around the connecting post 6. The positioning method when the blade 4 is open is as follows: Figure 6As shown, L-shaped notches 41 are provided on both the upper and lower sides of one side of the blade 4, and recessed holes 42 are located on the horizontal tangent surface inside the notches 41, as shown. Figure 5 As shown, one corner of the lower fixed block 8 is relatively smooth, allowing the blade 4 to slide over this smooth corner when rotating about the connecting column 6. The other corner of the lower fixed block 8 is close to a right angle, as shown below. Figure 2 As shown, when the stirring shaft rotates clockwise, the liquid resistance causes the impeller 4 to rotate around the connecting column 6, and the impeller 4 begins to open. When the impeller 4 swings to the near-right-angle corner, the corner forms a blockage on the vertical tangent of the notch 41, preventing the impeller 4 from sliding past the corner and keeping the impeller 4 in an open state. When the impeller 4 is open, it stirs and mixes the material in the container. Of course, other methods can also be used to prevent the impeller 4 from rotating, such as setting an outward protrusion on the side wall of the sleeve 3. When the impeller 4 rotates, the liquid resistance on the impeller 4 causes the impeller 4 to open. When the impeller 4 is opened to a certain angle, the protrusion prevents the impeller 4 from continuing to rotate, keeping the impeller 4 in an open state; for example, Figure 3 As shown, when the stirring shaft rotates counterclockwise, the resistance of the liquid causes the blade 4 to rotate around the connecting column 6 as the axis. The blade 4 begins to close, and the blade 4 can slide over the smooth corner of the lower fixed block 8, so that the blade 4 is in a closed state. The blade 4 is closed for the convenience of installing and disassembling the stirring shaft. Some stirring reactors or tanks have small installation openings, and it is not easy for the blade 4 to enter and exit when it is open. If the installation opening of the stirring reactor or tank is large enough, the blade 4 can be fixed.

[0016] Instructions for use: Use the stirring shaft of this invention to stir the solid-liquid mixture in the container, then extract the liquid, leaving the solid particles inside the container. The density of the solid particles is greater than the density of the solution. During use, one end of the filter head 2 faces downwards, and the hollow rotating shaft 1 is vertically inserted into the bottom of the container. The hollow rotating shaft 1 rotates clockwise, causing the paddles 4 to open and stir the material in the container. The stirring shaft is driven by a motor, which is not within the scope of this invention. After stirring, the hollow rotating shaft 1 stops rotating, and the solid particles sink. Connect the upper open end of the hollow rotating shaft 1 to a suction pump via a pipe. The container, pipe, and pump are external facilities and are not within the scope of this invention. The suction pump is turned on, and the solution in the container enters the filter head 2 through the pores of the filter head 2, and is then drawn out through the hollow rotating shaft 1. By setting a sleeve 3 on the outside of the filter head 2, the liquid in the container can be drawn out as much as possible, reducing the amount of liquid remaining at the bottom of the container. Liquid can also be injected into the container through the hollow rotating shaft 1, for example, by repeatedly injecting liquid into the container to wash solid particles, and then drawing the liquid out. When injecting liquid into the container, the upper end of the hollow rotating shaft 1 is open and connected to the feed pump through a pipe. The liquid enters the filter head 2 through the hollow rotating shaft 1, then passes through the pores of the filter head 2 into the container, simultaneously washing off the solid particles attached to the surface of the filter head 2. The stirring shaft of this invention can achieve solid-liquid separation. After the liquid is drawn out, there is no need for further filtration or centrifugation, reducing subsequent processing steps. By setting a sleeve 3 on the outside of the filter head 2, the amount of liquid remaining at the bottom of the container after liquid extraction is reduced.

[0017] The anti-dry-pull filter stirring shaft of the present invention is provided with a hollow rotating shaft, and a filter head is provided at the lower part of the hollow rotating shaft. When the liquid in the container is drawn out by the hollow rotating shaft, the filter head traps the solid particles, and the solid particles remain in the container. By setting a sleeve on the outside of the filter head, the dry-pull phenomenon that occurs after the liquid level in the container drops is prevented, and the liquid in the container is drawn out as much as possible, reducing the amount of liquid residue.

Claims

1. A dry-drying filter stirring shaft, comprising a hollow rotating shaft (1), wherein both the upper and lower ends of the hollow rotating shaft (1) are open, and the hollow rotating shaft (1) is provided with a blade (4) capable of rotating with the hollow rotating shaft (1), and the lower part of the hollow rotating shaft (1) is provided with a filter head (2) capable of filtering solid particles, the filter head (2) being sleeved outside the lower open end of the hollow rotating shaft (1), characterized in that: The filter head (2) is provided with a sleeve (3) on the outside. There is a gap between the sleeve (3) and the filter head (2). The upper end of the sleeve (3) is provided with a top wall (31) and the lower end is open. The hollow rotating shaft (1) passes through the top wall (31) and is sealed with the top wall (31).

2. The anti-dry-draft filter stirring shaft according to claim 1, characterized in that: The lower end of the sleeve (3) is open near the lowest point of the filter head (2), but not below the lowest point of the filter head (2).

3. The anti-dry-draft filter stirring shaft according to claim 1, characterized in that: The lower end of the hollow rotating shaft (1) is open near the lowest point of the filter head (2).

4. The anti-dry-draft filter stirring shaft according to claim 1, characterized in that: The hollow rotating shaft (1) is provided with a fixed plate (5), and the fixed plate (5) is detachably and fixedly connected to the sleeve (3).

5. The anti-dry-draft filter stirring shaft according to claim 1, characterized in that: The blade (4) is provided with at least two blades, and the blade (4) is installed on the sleeve (3).

6. The anti-dry-draft filter stirring shaft according to claim 5, characterized in that: When the hollow shaft (1) rotates in two different directions around the axis, the blades (4) can open and close respectively.

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