Main valve applied to large vertical cold trap of freeze dryer

Abstract

The utility model discloses a main valve applied to a large vertical cold trap of a freeze dryer, which comprises a main valve shaft, a front support sleeve, a main valve plate, a main valve oil cylinder and a rear support sleeve, the rear support sleeve and the front support sleeve are both connected with the main valve cold trap, and the rear support sleeve and the front support sleeve are arranged at an interval; the main valve oil cylinder is connected with the rear supporting sleeve, and a telescopic rod of the main valve oil cylinder is inserted into the rear supporting sleeve. One end of the main valve shaft penetrates through the first end of the rear supporting sleeve to be connected with a telescopic rod of the main valve oil cylinder, and the other end of the main valve shaft penetrates through the front supporting sleeve to be connected with a main valve plate. The utility model belongs to the technical field of freeze dryers, and aims to solve the problem that a main valve in the prior art cannot provide a firm and reliable supporting foundation for a main shaft of the main valve. The technical effect is that reliable support and stable work of the large-scale main valve shaft in a limited space of the cold trap are realized.

Description

Technical Field

[0001] This utility model relates to the field of freeze dryer technology, specifically to a main valve applied to a large vertical cold trap in a freeze dryer. Background Technology

[0002] With the booming development of industries such as pharmaceuticals, food, and biotechnology, freeze dryers, as key equipment for achieving low-temperature dehydration and preserving active ingredients, are receiving increasing attention for their performance and reliability. In the system architecture of a freeze dryer, the main valve plays a crucial role, controlling the gas flow and pressure during the freeze-drying process, directly affecting freeze-drying efficiency and product quality.

[0003] In the field of large-scale freeze dryers, the specifications and performance requirements of main valves are constantly increasing. However, traditional main valve structural designs have revealed many shortcomings in practical applications. As a core transmission component, the main shaft of a large main valve faces severe challenges when operating under complex conditions inside the cold trap. The extremely limited space in the cold trap, yet needing to accommodate numerous critical components, restricts the installation and support space for the main valve shaft. Previous support methods lack sufficient strength and cannot provide a solid and reliable support foundation for the large main valve shaft.

[0004] This results in poor radial limiting effect of the main valve spindle during operation. When the main valve operates frequently, performing operations such as evacuation and inflation during the freeze-drying process, the spindle is prone to instability during movement. Over time, the spindle may also deform due to excessive stress. These problems seriously affect the sealing performance, operational accuracy, and overall service life of the main valve. Utility Model Content

[0005] Therefore, this utility model provides a main valve for use in a large vertical cold trap of a freeze dryer to solve the above-mentioned problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] According to a first aspect of the present invention, a main valve for a large vertical cold trap in a freeze dryer includes a main valve shaft, a front support sleeve, a main valve plate, a main valve cylinder, and a rear support sleeve. Both the rear support sleeve and the front support sleeve are connected to the main valve cold trap, and the rear support sleeve and the front support sleeve are spaced apart.

[0008] The main valve cylinder is connected to the rear support sleeve, and the telescopic rod of the main valve cylinder is inserted into the rear support sleeve.

[0009] One end of the main valve shaft passes through the first end of the rear support sleeve and is connected to the telescopic rod of the main valve cylinder. The other end of the main valve shaft passes through the front support sleeve and is connected to the main valve plate.

[0010] Furthermore, it also includes a guide roller, with the first end of the rear support sleeve rotatably connected to the guide roller, and the main valve shaft and the guide roller being slidably connected.

[0011] Furthermore, it also includes a roller connecting plate, with the first end of the rear support sleeve connected to the roller connecting plate, and a guide roller rotatably connected to the roller connecting plate.

[0012] Furthermore, it also includes a shaft sleeve, with a shaft sleeve provided between the main valve shaft and the front support sleeve.

[0013] Furthermore, it also includes a coupling, which connects the main valve shaft to the telescopic rod of the main valve cylinder.

[0014] Furthermore, the main valve bellows is fitted onto the telescopic rod of the main valve cylinder.

[0015] Furthermore, it also includes a roller shaft, which is inserted into the roller connecting plate, and a guide roller is rotatably sleeved on the roller shaft.

[0016] Furthermore, it also includes a connecting valve plate, and the rear support sleeve is connected to the main valve cold trap through the connecting valve plate.

[0017] Furthermore, it also includes a front support frame, through which the front support sleeve is connected to the main valve cold trap.

[0018] Furthermore, it also includes a positioning rod and a connecting rod. The connecting rod is set on the front support frame, and the shaft sleeve is connected to one end of the positioning rod through the connecting rod. The other end of the positioning rod passes through the main valve cold trap and is connected to the rear support sleeve.

[0019] This utility model has the following advantages:

[0020] First, the main valve cylinder is connected to the rear support sleeve, and the piston rod of the main valve cylinder is directly connected to the main valve shaft, providing a precise and stable driving force for the movement of the main valve plate; thereby precisely controlling the movement of the main valve shaft, realizing the precise opening and closing action of the main valve plate, ensuring that parameters such as airflow and pressure in the freeze dryer are precisely regulated, and ensuring the stability and reliability of the freeze drying process.

[0021] Secondly, the rear support sleeve and the front support sleeve are connected to the main valve cold trap and are spaced apart. They provide stable support and guidance for the main valve shaft. When the main valve cylinder drives the main valve shaft to move, the rear support sleeve and the front support sleeve can effectively reduce the sway and offset of the main valve shaft, ensure the straightness and stability of the main valve shaft movement, and enable the main valve plate to accurately reach the predetermined position, thereby improving the sealing performance and working efficiency of the main valve.

[0022] Thirdly, the two-point positioning of the main valve shaft is achieved by using the rear support sleeve and the front support sleeve in conjunction with the sliding connection between the main valve shaft and the rear support sleeve. This ensures reliable support for the main valve shaft, guarantees its support strength, and ensures the stability of its movement. Furthermore, since only the rear support sleeve and the front support sleeve are used, the structure of this main valve is relatively simple and occupies less space. This allows for reliable support and stable operation of the large main valve shaft within the limited space of the cold trap, thereby indirectly ensuring the sealing performance and operational accuracy of the main valve and increasing its service life. Attached Figure Description

[0023] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0025] Figure 1 This is a schematic diagram of the structure of the main valve of a large vertical cold trap for a freeze dryer, provided for some embodiments of the present invention.

[0026] Figure 2 A first view of the main valve of a large vertical cold trap in a freeze dryer, provided for some embodiments of this utility model.

[0027] Figure 3 The main valve for a large vertical cold trap in a freeze dryer, as provided in some embodiments of this utility model. Figure 2 A magnified view of part I.

[0028] Figure 4 The main valve for a large vertical cold trap in a freeze dryer, as provided in some embodiments of this utility model. Figure 2 A magnified view of part II.

[0029] Figure 5 The main valve for a large vertical cold trap in a freeze dryer, as provided in some embodiments of this utility model. Figure 2 AA cross-section view.

[0030] Figure 6 This is a cross-sectional view of the rear support sleeve of the main valve of a large vertical cold trap in a freeze dryer, provided for some embodiments of the present invention.

[0031] Figure 7 A second view of the main valve of a large vertical cold trap in a freeze dryer, provided for some embodiments of this utility model.

[0032] Figure 8 The third view shows the main valve of a large vertical cold trap in a freeze dryer, as provided in some embodiments of this utility model.

[0033] In the diagram: 1. Main valve cylinder, 2. Main valve bellows, 3. Coupling, 4. Rear support sleeve, 5. Main valve shaft, 6. Front support sleeve, 7. Shaft sleeve, 8. Main valve plate, 9. Main valve cold trap, 91. Main valve cylinder, 10. Guide roller, 11. Connecting valve plate, 12. Positioning rod, 13. Front support frame, 14. Roller connecting plate, 15. Roller shaft, 16. Connecting rod, 17. Roller groove, 18. Connecting cylinder. Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] like Figures 1 to 8 As shown, the main valve of the large vertical cold trap of the freeze dryer in the first aspect embodiment of the present invention includes a main valve shaft 5, a front support sleeve 6, a main valve plate 8, a main valve cylinder 1 and a rear support sleeve 4. The rear support sleeve 4 and the front support sleeve 6 are both connected to the main valve cold trap 9, and the rear support sleeve 4 and the front support sleeve 6 are spaced apart.

[0036] The main valve cylinder 1 is connected to the rear support sleeve 4, and the piston rod of the main valve cylinder 1 is inserted into the rear support sleeve 4.

[0037] One end of the main valve shaft 5 passes through the first end of the rear support sleeve 4 and is connected to the piston rod of the main valve cylinder 1. The other end of the main valve shaft 5 passes through the front support sleeve 6 and is connected to the main valve plate 8.

[0038] In the above embodiments, it should be noted that the second end of the rear support sleeve 4 is connected to the outer side wall of the main valve cold trap 9 by bolts. The rear support sleeve 4 is a cylindrical structure, and the first end of the rear support sleeve 4 extends into the main valve cold trap 9.

[0039] The main valve cold trap 9 has a main valve cylinder 91 on its side. The main valve plate 8 is used to seal the opening of the main valve cylinder 91. The front support sleeve 6 is connected to the main valve cylinder 91 by welding or screwing.

[0040] Temperature and vacuum sensors are installed inside the freeze-drying chamber by means of screwing, bonding, or snap-fitting.

[0041] The working principle of the main valve structure of the cold trap in this freeze dryer is as follows: During the sublimation drying stage, the main valve cylinder 1 drives the main valve plate 8 to open, and the sublimated water vapor in the freeze-drying chamber enters the cold trap through the main valve cylinder, where it condenses into ice crystals on the surface of the cold trap coil. Simultaneously, this main valve structure works in conjunction with the vacuum pump to maintain the vacuum level of the freeze-drying chamber by adjusting the opening of the main valve plate 8, ensuring efficient sublimation. When the frost layer on the cold trap coil reaches a certain thickness, the defrosting stage begins. The main valve plate 8 closes to isolate the freeze-drying chamber from the cold trap, and then the heating device is activated to melt the frost layer. The condensate is discharged through the drainage system. This main valve structure can adjust its state in real time based on temperature and vacuum sensor signals, optimizing the cold trap collection efficiency and reducing energy consumption. Furthermore, the main valve has a bidirectional sealing protection function; it closes when isolation between the chamber and the cold trap is required to prevent gas infiltration and ensure the stability of the freeze-drying process. When the main valve is closed or open, it withstands the pressure difference between the cold trap and the chamber, powered by the main valve cylinder 1.

[0042] The technical effects achieved by the above embodiments are as follows:

[0043] First, the main valve cylinder 1 is connected to the rear support sleeve 4, and the piston rod of the main valve cylinder 1 is directly connected to the main valve shaft 5, providing a precise and stable driving force for the movement of the main valve plate 8; thereby precisely controlling the movement of the main valve shaft, realizing the precise opening and closing action of the main valve plate, ensuring that parameters such as airflow and pressure in the freeze dryer are precisely regulated, and ensuring the stability and reliability of the freeze drying process.

[0044] Fourth, the rear support sleeve 4 and the front support sleeve 6 are connected to the main valve cold trap 9 and are spaced apart. They provide stable support and guidance for the main valve shaft 5. When the main valve cylinder 1 drives the main valve shaft 5 to move, the rear support sleeve 4 and the front support sleeve 6 can effectively reduce the shaking and offset of the main valve shaft 5, ensure the straightness and stability of the main valve shaft 5, and enable the main valve plate 8 to accurately reach the predetermined position, thereby improving the sealing performance and working efficiency of the main valve.

[0045] Fifth, in addition, the two-point positioning of the main valve shaft 5 is achieved by the rear support sleeve 4 and the front support sleeve 6 in conjunction with the sliding connection between the main valve shaft 5 and the rear support sleeve 4. This ensures reliable support for the main valve shaft 5, guarantees its support strength, and ensures the stability of its movement. Furthermore, since only the rear support sleeve 4 and the front support sleeve 6 are provided, the structure of this main valve is relatively simple and occupies less space. This enables reliable support and stable operation of the large main valve shaft 5 within the limited space of the cold trap, thereby indirectly ensuring the sealing performance and operational accuracy of the main valve and increasing its service life.

[0046] Optional, such as Figures 1 to 8 As shown, in some embodiments, a guide roller 10 is also included, and the first end of the rear support sleeve 4 is rotatably connected to the guide roller 10, and the main valve shaft 5 is slidably connected to the guide roller 10.

[0047] In the above optional embodiments, it should be noted that there are two guide rollers 10, and each guide roller 10 is provided with a roller groove 17. The main valve shaft 5 is slidably connected between the roller grooves 17 of the two guide rollers 10.

[0048] The advantages of the above optional embodiments are that the reliability of the movement of the main valve shaft 5 is increased by the setting of the guide roller 10.

[0049] Optional, such as Figures 1 to 8 As shown, in some embodiments, a roller connecting plate 14 is also included. The first end of the rear support sleeve 4 is connected to the roller connecting plate 14, and a guide roller 10 is rotatably connected to the roller connecting plate 14.

[0050] It also includes a roller shaft 15, which is inserted into the roller connecting plate 14, and the guide roller 10 is rotatably sleeved on the roller shaft 15.

[0051] In the above optional embodiments, it should be noted that the roller connecting plate 14 and the rear support sleeve 4 are connected by means of screwing or welding; the roller shaft 15 and the roller connecting plate 14 are connected by means of screwing or welding; and the guide roller 10 and the roller shaft 15 are rotatably connected by bearings.

[0052] The advantages of the above optional embodiments are that a reliable rotational connection between the guide roller 10 and the rear support sleeve 4 is achieved by setting the roller connecting plate 14 and the roller shaft 15.

[0053] Optional, such as Figures 1 to 8 As shown, in some embodiments, a shaft sleeve 7 is also included, with the shaft sleeve 7 disposed between the main valve shaft 5 and the front support sleeve 6.

[0054] In the above optional embodiments, it should be noted that the shaft sleeve 7 and the front support sleeve 6 are connected by means of screw connection or snap connection.

[0055] The advantages of the above optional embodiments are: the coaxiality of the main valve can be finely adjusted by setting the shaft sleeve 7 to ensure the reliable operation of this main valve structure.

[0056] Optional, such as Figures 1 to 8 As shown, in some embodiments, a coupling 3 is also included, through which the main valve shaft 5 and the piston rod of the main valve cylinder 1 are connected.

[0057] In the above optional embodiments, it should be noted that the coupling 3 is connected to the piston rod of the main valve cylinder 1 by bolts, and the coupling 3 is connected to the main valve shaft 5 by bolts.

[0058] The advantages of the above optional embodiments are that the coupling 3 enables a reliable connection between the main valve shaft 5 and the piston rod of the main valve cylinder 1.

[0059] Optional, such as Figures 1 to 8 As shown, in some embodiments, the main valve bellows 2 is sleeved on the piston rod of the main valve cylinder 1.

[0060] In the above optional embodiments, it should be noted that one end of the main valve bellows 2 is connected to the inner wall of the rear support sleeve 4 and is located inside the rear support sleeve 4.

[0061] The advantages of the above optional embodiments are: the main valve bellows 2 can isolate the oil cylinder and the cold trap, preventing hydraulic oil and gas from contaminating the cold trap.

[0062] Optional, such as Figures 1 to 8 As shown, in some embodiments, a connecting valve plate 11 is also included, and the rear support sleeve 4 is connected to the main valve cold trap 9 through the connecting valve plate 11.

[0063] In the above optional embodiments, it should be noted that the rear support sleeve 4 is connected to the connecting valve plate 11 by welding, screwing, or snap-fitting; the main valve cold trap 9 is connected to the side opposite to the main valve cylinder 91 by welding and connecting cylinder 18, and the connecting valve plate 11 is connected to the connecting cylinder 18 on the outer side wall of the main valve cold trap 9 by screwing or snap-fitting.

[0064] The advantages of the above optional embodiments are: by setting the connecting valve plate 11 in conjunction with the connecting cylinder 18, the rear support sleeve 4 and the main valve cold trap 9 are fixed at two points, ensuring the reliability of the connection of the rear support sleeve 4.

[0065] Optional, such as Figures 1 to 8As shown, in some embodiments, a front support frame 13 is also included, and the front support sleeve 6 is connected to the main valve cold trap 9 through the front support frame 13.

[0066] It also includes a positioning rod 12 and a connecting rod 16. The connecting rod 16 is set on the front support frame 13. The shaft sleeve 7 is connected to one end of the positioning rod 12 through the connecting rod 16. The other end of the positioning rod 12 passes through the main valve cold trap 9 and is connected to the rear support sleeve 4.

[0067] In the above optional embodiments, it should be noted that the front support frame 13 is connected to the inner wall of the main valve cylinder 91 by means of screwing or welding.

[0068] The advantages of the above optional embodiments are as follows: the setting of the front support frame 13 makes the connection between the front support sleeve 6 and the main valve cold trap 9 more stable, provides more reliable support for the main valve shaft 5, reduces the shaking of the main valve shaft 5 during movement, and ensures the accuracy of the main valve plate movement.

[0069] The positioning rod 12 and connecting rod 16 serve to position and strengthen the connection. The connecting rod 16 connects the shaft sleeve 7 to the positioning rod, and the positioning rod 12 passes through the main valve cold trap 9 and connects to the rear support sleeve 4, enhancing the connection strength and stability between the front support sleeve 6 and the rear support sleeve 4. This allows the main valve structure to better maintain the stability of the overall structure when subjected to the pressure difference between the main valve cold trap 9 and the freezer, ensuring the stable operation of the main valve structure and guaranteeing the smooth progress of the freeze-drying process.

[0070] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0071] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

Claims

1. A main valve for use in a large vertical cold trap of a lyophilizer, characterized in that, It comprises a main valve shaft (5), a front support sleeve (6), a main valve valve plate (8), a main valve oil cylinder (1) and a rear support sleeve (4), the rear support sleeve (4) and the front support sleeve (6) are connected with a main valve cold trap (9), and the rear support sleeve (4) is arranged at intervals with the front support sleeve (6); The main valve oil cylinder (1) is connected with the rear support sleeve (4), and the telescopic rod of the main valve oil cylinder (1) is inserted on the rear support sleeve (4); One end of the main valve shaft (5) penetrates through the first end of the rear support sleeve (4) and is connected with the telescopic rod of the main valve oil cylinder (1), and the other end of the main valve shaft (5) is connected with the main valve valve plate (8) through the front support sleeve (6).

2. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 1, characterized in that, It also comprises a guide roller (10), the first end of the rear support sleeve (4) is rotatably connected with the guide roller (10), and the main valve shaft (5) is slidably connected with the guide roller (10).

3. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 2, characterized in that, It also comprises a roller connecting plate (14), the first end of the rear support sleeve (4) is connected with the roller connecting plate (14), and the roller connecting plate (14) is rotatably connected with the guide roller (10).

4. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 1, characterized in that, It also comprises a shaft middle sleeve (7), which is arranged between the main valve shaft (5) and the front support sleeve (6).

5. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 1, characterized in that, It also comprises a shaft coupling (3), which connects the main valve shaft (5) with the telescopic rod of the main valve oil cylinder (1).

6. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 1, characterized in that, A main valve bellows (2) is arranged on the telescopic rod of the main valve oil cylinder (1).

7. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 3, characterized in that, It also comprises a roller shaft (15), which is inserted on the roller connecting plate (14), and the guide roller (10) is rotatably arranged on the roller shaft (15).

8. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 1, characterized in that, It also comprises a connecting valve plate (11), which connects the rear support sleeve (4) with the main valve cold trap (9).

9. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 4, characterized in that, It also comprises a front support frame (13), which connects the front support sleeve (6) with the main valve cold trap (9).

10. The main valve for use in a large vertical cold trap of a lyophilizer according to claim 9, characterized in that, It also comprises a positioning rod (12) and a connecting rod (16), the connecting rod (16) is arranged on the front support frame (13), the shaft middle sleeve (7) is connected with one end of the positioning rod (12) through the connecting rod (16), and the other end of the positioning rod (12) penetrates through the main valve cold trap (9) and is connected with the rear support sleeve (4).

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