A separation and filtration device for veterinary drug preparation

Abstract

This invention relates to the field of veterinary drug preparation, specifically to a separation and filtration device for veterinary drug preparation, comprising: a raw water tank, a water supply pump installed at the output end of the raw water tank, and a filtration unit installed at the output end of the water supply pump. Specifically, the filtration unit includes an outer shell and an inner filter membrane. The output end of the outer shell is connected to a return pipe, the other end of which is connected to the interior of the raw water tank. One end of the outer shell is connected to a discharge pipe for discharging the filtrate filtered by the filter membrane. The filter membrane has through-holes to allow the filterable liquid to pass through. A sealing plug, perpendicular to the through-holes, is installed above the outer shell to obstruct the passage of the liquid. A control mechanism is used to drive the sealing plug to rise and fall, controlling the pressure inside the filter membrane. This solution, by intermittently controlling the gap size and synchronously coordinating with changes in the power of the water supply pump, can ensure high-speed filtration while avoiding large particles clogging the filtration unit.

Description

Technical Field

[0001] This invention relates to the field of veterinary drug preparation, and more particularly to a separation and filtration device for veterinary drug preparation. Background Technology

[0002] In the preparation of veterinary drugs, various medicinal materials and liquids typically require separation and filtration. Conventional separation and filtration methods include centrifugation or using a filter screen. However, for the separation of fine particles, cross-flow filtration is commonly used. For example, cross-flow filtration is employed in the preparation of porcine spleen transfer factor injection. Cross-flow filtration involves a pump driving the liquid flow parallel to the membrane surface. The resulting shear force carries away particles retained on the membrane surface, maintaining a relatively thin fouling layer. Under pressure, the liquid is filtered out tangentially, continuously rinsing the membrane surface and removing attached particles to prevent membrane clogging. The concentration of particles in the unfiltered liquid gradually increases until it reaches a certain level, at which point it is discharged, achieving solid-liquid separation.

[0003] Cross-flow filtration typically consists of a buffer tank, a circulation pump, and a filter chamber. The circulation pump continuously feeds the liquid to be filtered from the buffer tank into the filter chamber. After filtration, the remaining liquid flows back from the filter chamber to the buffer tank, and the filtered clear liquid is output through the outer chamber. While this approach achieves better filtration results, it can lead to clogging issues during the filtration process. Existing technologies use backwashing to clean the membrane surface. However, since backwashing is not performed continuously during filtration but only after each filtration cycle or at certain intervals, a small amount of stubborn particles remain on the inner wall of the filter membrane after each cleaning. Over long-term use, these adhered particles can still cause blockages, preventing the filter membrane from functioning properly and resulting in reduced filtration efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides the following technical solution:

[0005] A separation and filtration device for veterinary drug preparation includes: a raw water tank, a water supply pump installed at the output end of the raw water tank, a filtration unit installed at the output end of the water supply pump, and a control mechanism for driving the sealing plug to rise and fall.

[0006] Specifically, the filtration unit includes an outer shell and an inner filter membrane. The output end of the outer shell is connected to a return pipe, and the other end of the return pipe is connected to the inside of the raw water tank. One end of the outer shell is connected to a discharge pipe for discharging the filtrate filtered by the filter membrane. The filter membrane is provided with a through hole to allow the liquid to be filtered to pass through. A sealing plug is provided on the top of the outer shell, perpendicular to the through hole, to prevent the liquid from passing through. The control mechanism drives the sealing plug to rise and fall to control the pressure inside the filter membrane.

[0007] As an improvement to the above technical solution, the end of the through hole that contacts the sealing plug is provided with a boss-shaped outlet, and the sealing plug is boss-shaped.

[0008] As an improvement to the above technical solution, the bottom end of the sealing plug is provided with a connecting rod, which is sleeved inside the through hole. A guide sleeve is fixedly installed on the outer surface of the connecting rod. The outer ring of the guide sleeve does not contact the inner wall of the through hole. The guide sleeve is conical in shape, and the liquid flows in from the large hole end of the guide sleeve and flows out from the small hole end.

[0009] As an improvement to the above technical solution, the edge of the guide sleeve is provided with a cavity, which moves up and down to agitate the liquid and flush the filter membrane.

[0010] As an improvement to the above technical solution, a drain tee is provided between the water supply pump and the outer casing. The drain tee is connected to the water supply pump and the end away from the outer casing, and an alternately operating control valve one is connected to it. A backwash tee is provided at the end of the discharge pipe away from the outer casing. The two ends of the backwash tee away from the outer casing are connected to and pass through an alternately operating control valve two, one of which is connected to the backwash mechanism.

[0011] As an improvement to the above technical solution, the return pipe is connected to a return tee, and both outlets of the return tee are equipped with a solenoid valve 1 for controlling the opening and closing size. One of the solenoid valves 1 is connected to and passes through a branch pipe. The water inlet end of the water supply pump is equipped with an inlet tee, and both inlets of the inlet tee are connected to a solenoid valve 2 for controlling the opening and closing size. One of the solenoid valves 2 is connected to and passes through a branch pipe.

[0012] As an improvement to the above technical solution, the control mechanism includes an electromagnetic telescopic sleeve, which is fixedly installed on the top of the outer casing.

[0013] As an improvement to the above technical solution, the control mechanism includes a hydraulic telescopic sleeve installed at the top of the housing. The control end of the hydraulic telescopic sleeve is located outside the housing. Both the inlet and outlet ends of the hydraulic telescopic sleeve are connected to and pass through a metering pump. The end of the metering pump away from the hydraulic telescopic sleeve is connected to and passes through a circulation pipe, which extends into the interior of the housing. The outlet end of the metering pump connected to the inlet side of the hydraulic telescopic sleeve is connected to and passes through a sampling tee. A sealing unit is provided at the end of the sampling tee away from the metering pump and the circulation pipe.

[0014] As an improvement to the above technical solution, the two circulation pipes are connected together by a double-loop sleeve, which extends into the interior of the outer shell.

[0015] As an improvement to the above technical solution, the outer shell is divided into a fixed part at the upper end and a replacement part at the lower end, and the control mechanism and the return pipe are both connected to the fixed part.

[0016] The top of the replacement part is connected to the fixed part by a flange, and the bottom of the replacement part is connected to the drain tee by a double-threaded sleeve. The replacement part is equipped with a filter ring connected to the discharge pipe. The filter membrane is placed inside the filter ring. The top of the filter membrane is engaged with the inwardly protruding part of the top of the replacement part. The top of the replacement part is threadedly connected to a compression ring. The middle of the bottom compression ring is rotatably connected to a support frame with a hole. The connecting rod is slidably connected to the support frame. The free end of the control mechanism is fixedly installed with a connecting frame. The sealing plug is fixedly connected to the connecting frame.

[0017] The beneficial effects of this invention are:

[0018] 1. In this solution, the sealing plug can be controlled by the control mechanism to move up and down, thereby controlling the size of the opening between it and the through hole. When the opening is small or the power of the water supply pump is increased, the pressure of the material accumulated in the filter unit increases, thus increasing the filtration efficiency. When the pressure of the water supply pump decreases and the gap increases, the pressure in the filter unit decreases. Therefore, large particles that were squeezed and attached to the surface of the filter unit no longer adhere to the surface of the filter unit and flow out with the liquid flow. By intermittently controlling the gap size and synchronously coordinating with the changes in the power of the water supply pump, it is possible to ensure high-speed filtration while avoiding large particles clogging the filter unit.

[0019] 2. In this design, a connecting rod is installed at the bottom of the sealing plug. The connecting rod is sleeved inside the through hole, and a guide sleeve is fixedly installed on the outer surface of the connecting rod. The outer ring of the guide sleeve does not contact the inner wall of the through hole. The guide sleeve has openings that decrease in size according to the direction of liquid flow. The liquid flows out from the small opening of the guide sleeve. The guide sleeve is equivalent to a Venturi tube. This design can accelerate the liquid flow and create turbulence, thereby improving filtration efficiency. At the same time, the connecting rod and the sealing plug are fixedly connected. During the up-and-down movement of the sealing plug, the guide sleeve can disturb the liquid to be filtered, thereby improving filtration efficiency. In addition, a cavity is provided on the edge of the guide sleeve. The cavity moves up and down, agitating the liquid and flushing the filter membrane. Unlike mechanical friction cleaning, using fluid for flushing and cleaning can avoid damaging the filter membrane. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a half-sectional view of the outer casing of the present invention;

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0023] Figure 4 This is a half-sectional view of the filter membrane of the present invention;

[0024] Figure 5This is a three-dimensional structural diagram of the control mechanism of the present invention;

[0025] Figure 6 This is a diagram showing the internal structure of the electromagnetic telescopic sleeve of the present invention;

[0026] Figure 7 This is a half-sectional view of the sealing plug of the present invention;

[0027] Figure 8 for Figure 7 Enlarged structural diagram at point B in the middle.

[0028] Reference numerals: 1. Raw water tank; 2. Water supply pump; 3. Filtration unit; 31. Outer shell; 311. Discharge pipe; 312. Fixing part; 313. Replacement part; 314. Double-ended threaded sleeve; 315. Filter ring; 316. Compression ring; 317. Support frame; 318. Connecting frame; 32. Filter membrane; 321. Through hole; 322. Sealing plug; 323. Outlet; 33. Connecting rod; 331. Guide sleeve; 33 2. Cavity; 303. Return pipe; 4. Control mechanism; 401. Hydraulic telescopic sleeve; 402. Metering pump; 403. Circulation pipe; 404. Sampling tee; 405. Dual-way sleeve; 406. Electromagnetic telescopic sleeve; 5. Sewage tee; 6. Control valve one; 7. Backwash tee; 8. Control valve two; 9. Return tee; 10. Solenoid valve one; 11. Branch pipe; 12. Inlet tee; 13. Solenoid valve two. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] In existing technologies, backwashing is used to clean the membrane surface in order to solve the problem of membrane clogging caused by deposits. However, since backwashing is not performed continuously during the filtration process, but only after each filtration or at certain intervals, a small amount of stubborn particles remain on the inner wall of the filter membrane after each cleaning. Over long-term use, these adhered particles will still cause blockage, preventing the filter membrane from performing its filtration function properly and thus reducing filtration efficiency.

[0031] To solve the above problems, such as Figure 1-8 As shown, a separation and filtration device for veterinary drug preparation is provided, including: a raw water tank 1, a water supply pump 2 installed at the output end of the raw water tank 1, and a filtration unit 3 installed at the output end of the water supply pump 2;

[0032] Specifically, the filter unit 3 includes an outer shell 31 and an inner filter membrane 32. The output end of the outer shell 31 is connected to a return pipe 303, and the other end of the return pipe 303 is connected to the interior of the raw water tank 1. One end of the outer shell 31 is connected to a discharge pipe 311 for discharging the filtrate filtered by the filter membrane 32. The filter membrane 32 is provided with a through hole 321 for accommodating the material to be filtered. A sealing plug 322 is provided above the outer shell 31, perpendicular to the through hole 321, to prevent the material from passing through. A control mechanism 4 is used to drive the sealing plug 322 to rise and fall. The control mechanism 4 drives the sealing plug 322 to rise and fall to control the pressure inside the filter membrane 32.

[0033] During the process of controlling the lifting and lowering of the sealing plug 322, the gap between the through hole 321 and the sealing plug 322 will change. When the gap at the sealing plug 322 becomes larger, the pressure inside the filter membrane 32 decreases, and when the gap at the sealing plug 322 becomes smaller, the pressure inside the filter membrane 32 increases. By controlling the lifting and lowering of the sealing plug 322, the pressure change inside the filter membrane 32 can be controlled. This pressure change can accelerate the filtration speed of the filter membrane 32. When the lifting and lowering operation is performed repeatedly, the pressure inside the filter membrane 32 changes continuously. Under this situation, the internal liquid state can fluctuate greatly. This fluctuation will create an impact cleaning function on the inner wall of the filter membrane 32.

[0034] In this embodiment, the filter membrane 32 is a ceramic membrane with several filter holes on the inner wall of its membrane pores. Material that meets the filtration requirements can flow out from the filter holes into the cavity between the outer shell 31 and the filter membrane 32, and be discharged through the discharge pipe 311.

[0035] In one embodiment, see Figure 4 and Figure 5 The end of the through hole 321 that contacts the sealing plug 322 is provided with a boss-shaped outlet 323, and the sealing plug 322 is boss-shaped.

[0036] Because the connection between the sealing plug 322 and the outlet 323 is a boss shape, it can more easily achieve the sealing function when squeezed, and the sealing effect at the connection point will be better.

[0037] In one embodiment, see Figure 7 and Figure 8 A connecting rod 33 is provided at the bottom end of the sealing plug 322. The connecting rod 33 is sleeved inside the through hole 321. A guide sleeve 331 is fixedly installed on the outer surface of the connecting rod 33. The outer ring of the guide sleeve 331 does not contact the inner wall of the through hole 321. The guide sleeve 331 is conical. The liquid flows in from the large hole end of the guide sleeve 331 and flows out from the small hole end.

[0038] The guide sleeve 331 forms a structure similar to a Venturi tube. This design accelerates the flow of liquid and creates turbulence after the liquid flows out of the guide sleeve 331. The turbulence disturbs the flow of the liquid inside, which drives the liquid to make more thorough contact with the filter holes on the inner wall of the through hole 321, thereby improving the filtration efficiency. At the same time, the connecting rod 33 and the sealing plug 322 are fixedly connected. During the up-and-down movement of the sealing plug 322, the connecting rod 33 can drive the guide sleeve 331 to move. Since the sealing plug 322 is in a state of cyclical up-and-down movement, the guide sleeve 331 can continuously disturb the liquid inside the through hole 321, thereby improving the overall filtration efficiency.

[0039] In one embodiment, see Figure 8 The edge of the guide sleeve 331 is provided with a cavity 332. The cavity 332 moves up and down to agitate the liquid and flush the filter membrane 32. Unlike the traditional mechanical friction scraping to remove the deposits, the liquid moves up and down to agitate the deposits and clean them. This cleaning does not directly touch the inner wall of the filter membrane 32, thus avoiding damage to the filter membrane 32. Furthermore, since this agitation is always present during the filtration process, there is no problem of stubborn deposits.

[0040] In one embodiment, see Figure 1 and Figure 2 A drain tee 5 is provided between the water supply pump 2 and the housing 31. The drain tee 5 is connected to the end of the water supply pump 2 and the end away from the housing 31 by an alternating control valve 6. A backwash tee 7 is provided at the end of the discharge pipe 311 away from the housing 31. The two ends of the backwash tee 7 away from the housing 31 are connected to and pass through an alternating control valve 8, one of which is connected to the backwash mechanism.

[0041] After a certain period of use, the backwashing mechanism is activated, causing the water to flow downwards for backwashing. The backwashed wastewater is discharged through the drain end of the drain tee 5. The liquid flow inside the filter membrane 32 is from top to bottom, allowing large particles to fall off under their own weight. If the liquid flow direction of the filter membrane 32 is from bottom to top, the sealing plug 322 must completely block the through hole 321 during the backwashing process.

[0042] In one embodiment, see Figure 1 The return pipe 303 is connected to a return tee 9. Both outlet ends of the return tee 9 are equipped with a solenoid valve 10 to control the opening and closing size. One of the solenoid valves 10 is connected to and passes through a branch pipe 11. The inlet end of the water supply pump 2 is equipped with an inlet tee 12. Both inlets of the inlet tee 12 are connected to a solenoid valve 2 13 to control the opening and closing size. One of the solenoid valves 2 13 is connected to and passes through the branch pipe 11.

[0043] This setup allows the filtered liquid and the unfiltered liquid to flow back into the raw water tank 1 through the return pipe 303 for remixing, and then follow the water supply pump 2 back into the filter unit 3 for filtration again, thus achieving a reciprocating filtration function.

[0044] To further refine the plan, please refer to Figure 1 and Figure 5 The control mechanism 4 includes a hydraulic telescopic sleeve 401 installed at the top of the housing 31. A return spring is installed inside the hydraulic telescopic sleeve 401. The control end of the hydraulic telescopic sleeve 401 is located outside the housing 31. The inlet and outlet ends of the hydraulic telescopic sleeve 401 are connected to and pass through a metering pump 402. The end of the metering pump 402 away from the hydraulic telescopic sleeve 401 is connected to and passes through a circulation pipe 403. The circulation pipe 403 extends into the interior of the housing 31. The outlet end of the metering pump 402 connected to the inlet end of the hydraulic telescopic sleeve 401 is connected to and passes through a sampling tee 404. A sealing unit is provided at the end of the sampling tee 404 away from the metering pump 402 and the circulation pipe 403.

[0045] The control fluid for the hydraulic telescopic sleeve 401 can be controlled using internal feed fluid. During the circulation filtration process, feed fluid from the outer casing 31 is sent into the hydraulic telescopic sleeve 401 through the circulation pipe 403, thus achieving the hydraulic telescopic function. This design ensures that the feed fluid will not be contaminated in the event of a leak due to equipment failure, and sampling is still possible. If the control fluid is externally mounted, feed fluid cannot be used as the control fluid; instead, pure water must be used. Furthermore, both circulation pipes 403 are connected to a dual-path sleeve 405, which extends into the interior of the outer casing 31. This arrangement reduces the number of openings in the outer casing 31.

[0046] In one embodiment, the control mechanism 4 includes an electromagnetic telescopic sleeve 406, which is fixedly installed above the housing 31.

[0047] Unlike the above solutions, the expansion and contraction of the electromagnetic telescopic sleeve 406 is controlled by electromagnetic performance, which ensures the structural expansion and contraction capacity without the risk of leakage or pollution.

[0048] In one embodiment, see Figures 1 to 7Specifically, the outer casing 31 is divided into an upper fixed part 312 and a lower replacement part 313. The control mechanism 4 and the return pipe 303 are both connected to the fixed part 312. The fixed part 312 is not disassembled. The top of the replacement part 313 is flange-connected to the fixed part 312. The bottom of the replacement part 313 is threadedly connected to the drain tee 5 through a double-threaded sleeve 314. The inside of the replacement part 313 is provided with a filter ring 315 connected to the discharge pipe 311. The filter membrane 32 is located inside the filter ring 315. The top of the filter membrane 32 is engaged with the inwardly protruding part of the top of the replacement part 313. The top of the replacement part 313 is threadedly connected with a compression ring 316. The middle of the lowest compression ring 316 is rotatably connected to a support frame 317 with holes. The connecting rod 33 is slidably connected to the support frame 317. The free end of the control mechanism 4 is fixedly installed with a connecting frame 318. The sealing plug 322 is fixedly connected to the connecting frame 318.

[0049] During replacement, first place the filter membrane 32 inside the replacement part 313 and limit the filter membrane 32 by the compression ring 316 at the bottom, and connect it to the flange at the top. Then rotate the connecting rod 33 so that the connecting rod 33 can be threadedly connected to the sealing plug 322. After aligning and connecting the support frame 317, rotate the corresponding compression ring 316 to fix the support frame 317. Use the support frame 317 to limit the connecting rod 33 from below to prevent the connecting rod 33 from shaking. After completion, rotate the double-ended threaded sleeve 314 to complete the sealing connection.

[0050] In this embodiment, the liquid to be filtered in the raw water tank 1 is drawn out by the water supply pump 2 and pumped into the filter unit 3. It is then filtered through the filter membrane 32. Large particles are filtered by the filter membrane 32 and return to the raw water tank 1 with the liquid flow. Since the sealing plug 322 can be controlled by the control mechanism 4 to move up and down, the size of the opening between the through holes 321 is controlled. When the opening is reduced and / or the power of the water supply pump 2 is increased, the pressure of the liquid accumulated in the filter membrane 32 increases, thus increasing the filtration efficiency. Conversely, when the opening is increased... When the power of the water supply pump 2 is reduced, the pressure inside the filter membrane 32 decreases, thus causing large particles that were pressed and attached to the surface of the filter unit 3 to no longer adhere to the surface of the filter unit 3. During this process, since the guide sleeve 331 is constantly moving up and down inside, the particles inside will not adhere to the inner wall of the filter membrane 32 and will flow back with the filtered liquid. By intermittently controlling the size of the gap and synchronously coordinating with the changes in the power of the water supply pump 2, it is possible to ensure high-speed filtration while avoiding large particles clogging the filter membrane 32.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A separation and filtration device for veterinary drug preparation, characterized in that, include: Raw water tank (1); Water supply pump (2) installed at the output end of raw water tank (1); A filter unit (3) is provided at the output end of the water supply pump (2). The filter unit (3) includes an outer shell (31) and an inner filter membrane (32). The output end of the outer shell (31) is connected to a return pipe (303). The other end of the return pipe (303) is connected to the inside of the raw water tank (1). One end of the outer shell (31) is connected to a discharge pipe (311) for discharging the filtrate filtered by the filter membrane (32). The filter membrane (32) is provided with a through hole (321) to allow the liquid to be filtered to pass through, and a sealing plug (322) is provided above the outer shell (31) perpendicular to the through hole (321) to prevent the liquid from passing through. A control mechanism (4) is used to drive the sealing plug (322) to rise and fall, the control mechanism (4) driving the sealing plug (322) to rise and fall to control the pressure inside the filter membrane (32).

2. The separation and filtration device for veterinary drug preparation according to claim 1, characterized in that: The end of the through hole (321) that contacts the sealing plug (322) is provided with a boss-shaped outlet (323), and the sealing plug (322) is boss-shaped.

3. The separation and filtration device for veterinary drug preparation according to claim 2, characterized in that: The bottom end of the sealing plug (322) is provided with a connecting rod (33), which is sleeved inside the through hole (321). A guide sleeve (331) is fixedly installed on the outer surface of the connecting rod (33). The outer ring of the guide sleeve (331) does not contact the inner wall of the through hole (321). The guide sleeve (331) is conical. The liquid flows in from the large hole end of the guide sleeve (331) and flows out from the small hole end.

4. The separation and filtration device for veterinary drug preparation according to claim 3, characterized in that: The edge of the guide sleeve (331) is provided with a cavity (332), and the cavity (332) moves up and down to stir the liquid and wash the filter membrane (32).

5. The separation and filtration device for veterinary drug preparation according to claim 1, characterized in that: A drain tee (5) is provided between the water supply pump (2) and the outer casing (31). The drain tee (5) is connected to the water supply pump (2) and the end away from the outer casing (31) by an alternating control valve (6). The discharge pipe (311) is provided with a backwash tee (7) at one end away from the outer shell (31). The two ends of the backwash tee (7) away from the outer shell (31) are connected to and pass through an alternately operating control valve (8), one of which is connected to the backwash mechanism.

6. The separation and filtration device for veterinary drug preparation according to claim 5, characterized in that: The return pipe (303) is connected to a return tee (9). Both outlets of the return tee (9) are equipped with a solenoid valve (10) to control the opening and closing size. One of the solenoid valves (10) is connected to and passes through a branch pipe (11). The water inlet of the water pump (2) is equipped with an inlet tee (12). Both inlets of the inlet tee (12) are connected to a solenoid valve (13) to control the opening and closing size. One of the solenoid valves (13) is connected to and passes through the branch pipe (11).

7. The separation and filtration device for veterinary drug preparation according to claim 5, characterized in that: The control mechanism (4) includes an electromagnetic telescopic sleeve (406), which is fixedly installed above the outer casing (31).

8. The separation and filtration device for veterinary drug preparation according to claim 5, characterized in that: The control mechanism (4) includes a hydraulic telescopic sleeve (401) installed on the top of the housing (31). The control end of the hydraulic telescopic sleeve (401) is located outside the housing (31). The inlet and outlet ends of the hydraulic telescopic sleeve (401) are connected to and pass through a metering pump (402). The end of the metering pump (402) away from the hydraulic telescopic sleeve (401) is connected to and passes through a circulation pipe (403). The circulation pipe (403) extends into the interior of the housing (31). The outlet end of the metering pump (402) connected to the inlet side of the hydraulic telescopic sleeve (401) is connected to and passes through a sampling tee (404). The end of the sampling tee (404) away from the metering pump (402) and the circulation pipe (403) is provided with a sealing unit.

9. A separation and filtration device for veterinary drug preparation according to claim 8, characterized in that: The two circulation pipes (403) are connected together to a double-ended sleeve (405), which extends into the interior of the outer casing (31).

10. A separation and filtration device for veterinary drug preparation according to any one of claims 1-9, characterized in that: The outer casing (31) is divided into a fixed part (312) at the upper end and a replacement part (313) at the lower end. The control mechanism (4) and the return pipe (303) are both connected to the fixed part (312). The top of the replacement part (313) is connected to the fixed part (312) by a flange, and the bottom of the replacement part (313) is connected to the drain tee (5) by a double-threaded sleeve (314). The replacement part (313) is provided with a filter ring (315) connected to the discharge pipe (311). The filter membrane (32) is provided inside the filter ring (315). The top of the filter membrane (32) is engaged with the inwardly protruding part of the top of the replacement part (313). The top of the replacement part (313) is threadedly connected to a compression ring (316). The middle of the lowest compression ring (316) is rotatably connected to a support frame (317) with holes. The connecting rod (33) is slidably connected to the support frame (317). The free end of the control mechanism (4) is fixedly equipped with a connecting frame (318), and the sealing plug (322) is fixedly connected to the connecting frame (318).

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