Mechanical sealing structure and sterile preparation system

Abstract

The utility model provides a mechanical sealing structure and a sterile preparation system. The mechanical sealing structure comprises a shaft, a shaft sleeve, an air side moving ring support, an end cover, a cooling water inlet, a cooling water outlet and a sterilization water outlet. The shaft sleeve coaxially sleeves the main shaft; the air side moving ring support is arranged on the periphery of the shaft sleeve; the end cover sleeves the surface of the shaft sleeve; the cooling water inlet and the cooling water outlet are formed in the two sides of the end cover respectively. The sterilization water outlet is formed in the air side moving ring support and located at the low point of the mechanical seal inner cavity. According to the design of the utility model, condensed water generated in the sterilization process can be timely and thoroughly discharged, the sterilization effect is obviously improved, and the pollution risk can be reduced. And meanwhile, effective cooling of the mechanical sealing structure can be guaranteed through the arrangement of the cooling water inlet and the cooling water outlet, and the system can maintain stable operation.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal structure and a sterile preparation system. Background Art

[0002] Mechanical seals are key components in the production of sterile preparations, and their performance directly impacts product quality and production safety. Existing mechanical seals face numerous technical challenges when applied to specialized and complex preparations.

[0003] First, high dispersion is a basic requirement for the production of special complex preparations. To achieve this requirement, the production process usually involves rotating equipment such as shears and mechanical stirrers. The mechanical shafts of these devices need to penetrate the material cavity, and mechanical seals are used as sealing devices for the material cavity. However, mechanical seals are not completely closed structures, and there are tiny alternating surfaces between the material side and the mechanical seal coolant side, which increases the risk of contamination. Secondly, the existing mechanical seal system has efficiency and safety issues during the sterilization process. The traditional practice is to pass sterile cooling water into the cooling water cavity of the mechanical seal, but this method cannot completely eliminate the risk of contamination. Even if sterile water is used, there is still a possibility of contamination because the water flow channel in the cavity has not been fully sterilized.

[0004] Another significant issue is the presence of low points within the mechanical seal cavity, particularly in larger equipment. These low points can accumulate condensate, making it difficult to completely drain during sterilization. Existing technologies typically rely on the pressure differential between the inlet and outlet of the mechanical seal to dissipate this condensate, but this method is inefficient and unreliable. To avoid pressure imbalances between the inlet and outlet, the mechanical seal balancing system must be sterilized in two steps, significantly extending the sterilization time of the entire liquid distribution system.

[0005] As production equipment scales up, the shaft diameter of mechanical seals also increases, leading to a corresponding increase in the amount of condensate retained at low points. During the sterilization process, steam may not be able to heat this water to the required sterilization temperature, increasing the risk of contamination. This problem is particularly prominent in large-scale equipment, where the larger condensate volume is more difficult to achieve superheating.

[0006] In general, existing mechanical seals have several shortcomings when it comes to meeting the stringent requirements of sterile pharmaceutical production. These issues include suboptimal sealing, inefficient sterilization processes, and difficulty removing condensate. These technical challenges not only impact production efficiency but, more importantly, can compromise product quality and safety. Therefore, breakthroughs in mechanical seal design are urgently needed. Utility Model Content

[0007] The purpose of the utility model is to provide a mechanical sealing structure and a sterile preparation system to solve the technical problems in the prior art that the sterilization effect of the mechanical sealing structure is not ideal and the condensed water is difficult to discharge.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] The utility model provides a mechanical seal structure, which includes a main shaft, a shaft sleeve, an air side dynamic ring support, an end cover, a cooling water inlet, a cooling water outlet and a sterilization drain port;

[0010] The shaft sleeve is coaxially sleeved on the main shaft;

[0011] The air side dynamic ring support is arranged on the outer periphery of the shaft sleeve;

[0012] The end cover is sleeved on the surface of the shaft sleeve;

[0013] The cooling water inlet and the cooling water outlet are respectively arranged on both sides of the end cover;

[0014] The sterilization drain port is arranged on the air side dynamic ring support and is located at the lowest point of the mechanical seal inner cavity.

[0015] Furthermore, the mechanical sealing structure further comprises a material side dynamic and static ring assembly and an air side dynamic and static ring assembly, and the material side dynamic and static ring assembly and the air side dynamic and static ring assembly are coaxially arranged on the shaft sleeve.

[0016] Furthermore, the shaft sleeve also includes a material side dynamic ring support, and the material side dynamic ring support is fixed on the main shaft.

[0017] Furthermore, the mechanical sealing structure further includes a driving screw, and the driving screw is used to fix the air-side dynamic ring support on the main shaft.

[0018] Furthermore, the mechanical sealing structure further includes a diaphragm valve, and the diaphragm valve is connected to the sterilization drain port.

[0019] Furthermore, a embedding groove is provided on the surface of the end cover, and a sealing gasket is installed in the embedding groove.

[0020] In addition, the utility model also provides a sterile preparation system, which includes the above-mentioned mechanical sealing structure and also includes a sterilization hose that is detachably connected to the sterilization drain outlet.

[0021] Furthermore, the sterile preparation system further includes a steam trap, which is connected to the sterilization hose.

[0022] Furthermore, the sterile preparation system also includes a mechanically sealed water storage tank, which is connected to a cooling water inlet and a cooling water outlet through a pipeline to form a cooling water circulation system.

[0023] Furthermore, a cooling coil is provided in the mechanically sealed water storage tank, and the cooling coil is used to pass chilled water and pure steam to prepare sterile cooling water.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] By providing a sterilization drain port within the mechanical seal structure, located at a low point within the mechanical seal cavity, this effectively addresses the existing difficulty in draining condensed water. This design allows for the timely and thorough drainage of condensed water generated during the sterilization process, significantly improving sterilization effectiveness and reducing contamination risks. Furthermore, the provision of cooling water inlets and outlets ensures effective cooling of the mechanical seal structure, enabling the system to maintain stable operation.

[0026] Furthermore, the sterile preparation system of the present invention forms a complete sterile preparation production system through components such as a sterilization hose, a steam trap, and a mechanically sealed water storage tank, all integrated with the mechanical seal structure. This system design not only improves sterilization efficiency but also enables the recycling of cooling water, further ensuring the sterility and economic efficiency of the production process. In particular, the cooling coil design within the mechanically sealed water storage tank enables the system to continuously provide sterile cooling water, effectively ensuring a sterile environment throughout the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the mechanical seal structure of the first embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of a sterile preparation system according to Example 2 of the present utility model;

[0029] Figure 3 This is a schematic diagram of the working principle of tank sterilization in the sterile preparation system of Example 2 of the present utility model;

[0030] Figure 4 This is a schematic diagram of the sterilization working principle of the mechanical sealing cooling system in the sterile preparation system of the second embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of the working principle of preparing sterile water in the sterile preparation system of Example 2 of the present utility model;

[0032] Figure 6 This is a schematic diagram of the working principle of the mechanical sealing cooling self-circulation in the sterile preparation system of Example 2 of the present utility model.

[0033] In the figure, 1. Cooling water inlet; 2. Cooling water outlet; 3. Sterilization drain outlet; 4. End cover; 5. Air side dynamic ring support; 6. Main shaft; 7. Diaphragm valve; 8. Material side dynamic and static ring assembly; 9. Air side dynamic and static ring assembly; 10. Material side dynamic ring support; 11. Drive screw; 12. Sterilization hose; 13. Mechanically sealed water storage tank; 14. Cooling coil. DETAILED DESCRIPTION

[0034] The following is a more detailed description of a mechanical seal structure and sterile preparation system of the present invention, with reference to the accompanying drawings, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being generally known to those skilled in the art and not intended to limit the present invention.

[0035] In the description of this specification, "one embodiment" or "some embodiments" means that one or more embodiments of this specification include a particular feature, structure, or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in other embodiments," etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized.

[0036] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0037] Example 1:

[0038] like Figure 1 As shown, the utility model provides a mechanical seal structure, including a main shaft 6, a sleeve, an air side dynamic ring support 5, an end cover 4, a cooling water inlet 1, a cooling water outlet 2 and a sterilization drain 3;

[0039] Specifically, the sleeve is coaxially mounted on the main shaft 6; the air-side dynamic ring support 5 is disposed on the outer periphery of the sleeve; the end cap 4 is sleeved onto the surface of the sleeve; the cooling water inlet 1 and the cooling water outlet 2 are disposed on either side of the end cap 4, respectively inputting and discharging coolant to facilitate cooling the heat generated by the rotation of the main shaft 6; the sterilization drain port 3 is disposed on the air-side dynamic ring support 5 and is located at the lowest point of the mechanical seal cavity to drain condensed water generated during the sterilization process. Furthermore, the end cap 4 is provided with a sterilization inlet for introducing pure steam.

[0040] In this embodiment, the mechanical seal structure further includes a material-side dynamic and static ring assembly 8 and an air-side dynamic and static ring assembly 9, which are coaxially arranged on the shaft sleeve. This arrangement effectively isolates the material side from the air side, preventing material leakage and external air ingress, thereby ensuring the sterility of the preparation.

[0041] Furthermore, the sleeve further includes a material side dynamic ring support 10, which is fixed to the main shaft 6. This design enables the material side dynamic and static ring assembly 8 to be firmly mounted on the main shaft 6, thereby improving the stability and reliability of the entire mechanical seal structure.

[0042] In a specific embodiment, the mechanical seal structure further includes a drive screw 11, which is used to fix the air-side dynamic ring support 5 to the main shaft 6. This fixing method facilitates installation and removal, while also ensuring a tight connection between the air-side dynamic ring support 5 and the main shaft 6, reducing the possibility of leakage.

[0043] Preferably, the mechanical seal structure further includes a diaphragm valve 7 connected to the sterilization drain port 3 to maintain the sealed state of the mechanical seal cavity after sterilization is completed. The diaphragm valve 7 can precisely control the opening and closing of the sterilization drain port 3, ensuring that condensed water can be effectively drained when needed and completely sealed when not needed, thus avoiding unnecessary material loss and contamination risks.

[0044] More preferably, a groove is provided on the surface of the end cover 4, and a sealing gasket is installed in the groove. This design further enhances the sealing effect between the end cover 4 and other components, effectively preventing leakage of cooling water and entry of external pollutants.

[0045] The beneficial effect of this embodiment is that, by providing a sterilization drain port 3 on the air-side dynamic ring support 5, the problem of condensed water at low points in the mechanical seal cavity being difficult to drain in the prior art is resolved, significantly improving the sterilization effect and the aseptic properties of the system. Furthermore, the provision of the cooling water inlet 1 and the cooling water outlet 2 effectively controls the temperature of the mechanical seal structure, ensuring stable operation of the system.

[0046] Example 2:

[0047] like Figure 2As shown, this embodiment provides a sterile preparation system, comprising the mechanical seal structure described in Example 1, and further comprising a sterilization hose 12 detachably connected to the sterilization drain 3. The sterilization hose 12 is designed to be removed before the device is operated to avoid interference. This detachable design ensures that the rotating mechanical device rotates without any interference, facilitates cleaning and maintenance of the system, and improves its flexibility.

[0048] In this embodiment, the sterile preparation system further includes a steam trap (not shown in the figure for simplicity of illustration), which is connected to the sterilization hose 12. The provision of the steam trap can effectively prevent steam from entering the sterilization hose 12, ensuring that only condensed water is discharged, which not only improves the energy efficiency of the system but also further ensures the sterility of the system.

[0049] Furthermore, the sterile preparation system also includes a mechanically sealed water storage tank 13, which is connected to the cooling water inlet 1 and the cooling water outlet 2 via a pipeline to form a cooling water circulation system. This closed-loop design not only saves water resources, but also ensures the cleanliness of the cooling water and reduces the risk of contamination.

[0050] In another embodiment, a cooling coil 14 is installed within the mechanically sealed water storage tank 13. This cooling coil 14 is used to introduce chilled water and pure steam to produce sterile cooling water, which is then circulated within the cooling water circulation system. This design ensures the sterility of the cooling water, further enhancing the sterility level of the entire system.

[0051] like Figures 2 to 6 As shown, the thick line in the figure is the principle pipeline direction, and the specific usage method of this embodiment is as follows:

[0052] like Figure 2 As shown, connect the machine-sealed sterilization condensation drain pipe: connect the sterilization hose 12 to the sterilization drain port 3, and connect the steam trap to the other end of the sterilization hose 12.

[0053] like Figure 3 As shown, tank sterilization: steam is introduced into the entire system through the pipeline to fully sterilize the tank.

[0054] like Figure 4 As shown, mechanical seal cooling system sterilization: sterilize the mechanical seal cooling system at the same time to ensure the sterility of the entire system.

[0055] like Figure 5 As shown, to prepare sterile water: After sterilization, close the valve on the tank to ensure a sealed system. Disconnect the sterilization hose 12 to ensure no interference during equipment rotation. Pass chilled water and pure steam through the cooling coil 14 of the mechanically sealed water storage tank 13 to prepare sterile cooling water.

[0056] like Figure 6 As shown, the mechanical seal cooling is self-circulating: the prepared sterile cooling water is circulated in the mechanical seal cavity through the cooling water inlet 1 and the cooling water outlet 2 to achieve a continuous cooling effect.

[0057] The beneficial effects of this embodiment are: flexible and efficient condensate discharge is achieved through the provision of the sterilization hose 12 and the drain valve; the design of the mechanically sealed water storage tank 13 and the cooling coil 14 ensures the sterility and recycling of the cooling water, greatly improving the energy efficiency and environmental protection of the system.

[0058] In summary, the mechanical seal structure and sterile preparation system provided by the utility model effectively solve the problem of difficulty in draining condensed water at low points in the inner cavity of the mechanical seal by arranging a sterilization drain port on the air-side dynamic ring support, thereby significantly improving the sterilization effect. The setting of the cooling water inlet and cooling water outlet realizes effective temperature control and ensures the stable operation of the system. The coordinated use of the sterilization hose and the steam trap improves the flexibility and energy efficiency of the system. The design of the mechanical seal water storage tank and the cooling coil ensures the sterility and recycling of the cooling water, and improves the environmental friendliness of the system. The overall design optimizes the sterilization process, can shorten the sterilization time, improve production efficiency, and significantly reduce the risk of contamination, providing a more reliable guarantee for the production of sterile preparations.

[0059] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A mechanical sealing structure, characterized in that: include: Spindle, sleeve, air side dynamic ring support, end cover, cooling water inlet, cooling water outlet and sterilization drain; The shaft sleeve is coaxially sleeved on the main shaft; The air side dynamic ring support is arranged on the outer periphery of the shaft sleeve; The end cover is sleeved on the surface of the shaft sleeve; The cooling water inlet and the cooling water outlet are respectively arranged on both sides of the end cover; The sterilization drain port is arranged on the air side dynamic ring support and is located at the lowest point of the mechanical seal inner cavity.

2. The mechanical sealing structure according to claim 1, characterized in that: It also includes a material side dynamic and static ring assembly and an air side dynamic and static ring assembly, and the material side dynamic and static ring assembly and the air side dynamic and static ring assembly are coaxially arranged on the shaft sleeve.

3. The mechanical sealing structure according to claim 1, characterized in that: The shaft sleeve further comprises a material side dynamic ring support, and the material side dynamic ring support is fixed on the main shaft.

4. The mechanical sealing structure according to claim 1, characterized in that: It also includes a driving screw, which is used to fix the air-side dynamic ring support on the main shaft.

5. The mechanical sealing structure according to claim 1, characterized in that: It also includes a diaphragm valve, which is connected to the sterilization drain port.

6. The mechanical sealing structure according to claim 5, characterized in that: A embedding groove is provided on the surface of the end cover, and a sealing gasket is installed in the embedding groove.

7. A sterile preparation system, characterized in that: It comprises the mechanical sealing structure according to any one of claims 1 to 6, and also comprises a sterilization hose detachably connected to the sterilization drain outlet.

8. The sterile preparation system according to claim 7, characterized in that: It also includes a drain valve, which is connected to the sterilization hose.

9. The sterile preparation system according to claim 7, characterized in that: It also includes a mechanically sealed water storage tank, which is connected to a cooling water inlet and a cooling water outlet through a pipeline to form a cooling water circulation system.

10. The sterile preparation system according to claim 9, characterized in that: A cooling coil is provided in the mechanically sealed water storage tank, and the cooling coil is used to pass chilled water and pure steam to prepare sterile cooling water.

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