Self-cleaning device of exhaust filtering equipment of freeze dryer

Abstract

The utility model relates to a self-cleaning device for exhaust filtering equipment of a freeze dryer, and aims to solve the problems that when gas is purified through an efficient filtering device at present, an adsorption layer of the efficient filtering device is easily blocked after being used for a long time, so that the filtering efficiency and effect of toxic gas are influenced, and the service life of the efficient filtering device is prolonged. The freeze dryer comprises a freeze dryer body and a filtering mechanism which are arranged on a bottom plate, the filtering mechanism comprises a filtering cylinder installed on the bottom plate, a cylinder cover is connected to an opening in the top of the filtering cylinder through a bolt, a filter element is arranged in the filtering cylinder, and the filter element is connected with the filtering cylinder through a bolt. The self-cleaning type freeze dryer has the advantages that the self-cleaning type freeze dryer can be self-cleaned when the filter element is used for filtering, the filter element is prevented from being blocked to influence the filtering efficiency and effect of gas, and the self-cleaning type freeze dryer does not need to be cleaned by personnel without stopping the machine, so that the self-cleaning type freeze dryer is relatively convenient.

Description

Technical Field

[0001] This utility model relates to the field of freeze dryer exhaust filtration, specifically a self-cleaning device for freeze dryer exhaust filtration equipment. Background Technology

[0002] China is a major livestock producer, and its livestock farming scale has been continuously expanding in recent decades. However, my country's farming level still lags behind that of developed countries, and various epidemics cause significant losses to the domestic livestock industry every year. Therefore, my country has been continuously improving its vaccine research and development capabilities and actively developing new vaccines. However, for current livestock epidemics, freeze-dried live vaccines offer the best immunization efficacy and widest range of applications. Their manufacturing process requires freeze-drying machines to freeze the vaccine for convenient storage.

[0003] In practical applications, researchers typically preserve microbial strains and viruses for extended periods by placing them in glass bottles, rapidly freeze-drying them using vacuum freeze-drying equipment, and then sealing the bottle mouth by sintering with high-temperature melting. Vacuum freeze-drying technology using a freeze dryer is currently a commonly used and ideal method for preserving microbial strains or vaccines. The freeze-drying method involves rapidly freezing cells at a low temperature (the specific temperature depends on the nature of the strain) while maintaining cell integrity, and then allowing the water to sublimate in a vacuum. In this low-temperature vacuum environment, the growth and metabolism of microorganisms temporarily cease, making them less prone to mutation. During this freeze-drying process, the freeze dryer equipment requires a vacuum pump to remove air and achieve a high vacuum within the freeze dryer container.

[0004] A self-cleaning device for a freeze dryer exhaust filtration system includes a freeze dryer, a high-efficiency filter, and a vacuum pump. The freeze dryer has an exhaust port, the high-efficiency filter has an inlet and an outlet, and the vacuum pump has an inlet and an exhaust port. The freeze dryer exhaust port is connected to the filter inlet via a first connecting pipe, and the filter outlet is connected to the vacuum pump inlet via a second connecting pipe. The filter inlet is connected to an inlet detection port, and the filter outlet is connected to an outlet detection port. The air inlet detection port is equipped with a first airtight valve, and the air outlet detection port is equipped with a second airtight valve. In the process of developing this utility model, the inventors discovered that at least the following problems remain unresolved in the existing technology: High-efficiency filters adsorb and filter out bacteria and viruses in the airflow before releasing it into the external environment to ensure biosafety. However, in traditional high-efficiency filters, the adsorption layer is easily clogged after prolonged use, affecting the efficiency and effectiveness of filtration of toxic gases. This necessitates shutdown and disassembly / cleaning of the high-efficiency filter, which is time-consuming. Therefore, a new technical solution is needed to address these issues. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a self-cleaning device for the exhaust filtration equipment of a freeze dryer. This solves the technical problem that the adsorption layer of the high-efficiency filter is easily blocked after long-term use, which affects the efficiency and effect of filtration of toxic gases. As a result, it is necessary to stop the machine to disassemble and clean the high-efficiency filter, which is quite troublesome.

[0006] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: a self-cleaning device for a freeze dryer exhaust filtration equipment is designed, including a freeze dryer body and a filtration mechanism set on a base plate. The filtration mechanism includes a filter cylinder installed on the base plate. A cylinder cover is bolted to the top opening of the filter cylinder. A filter element is set inside the filter cylinder. An air suction pipe is provided between the freeze dryer body and the filter cylinder. A rigid air extraction pipe is provided on the lower side of the end of the filter cylinder away from the air suction pipe. The other end of the air extraction pipe is connected to a negative pressure pump.

[0007] A drive motor is installed on the cylinder cover. The drive end of the drive motor is connected to a drive shaft via a coupling. The drive shaft rotates through the cylinder cover and is connected to a top plate. The top plate is connected to the top of the filter element via bolts. The bottom of the filter element is connected to a base plate via bolts. The air extraction pipe passes through the filter cylinder and is connected to the bottom of the base plate via a rotary joint. The rotary joint communicates with the inner cavity of the filter element.

[0008] Preferably, fan blades are installed on the drive shaft above the top plate. The number of fan blades is three, and the three fan blades are equidistantly distributed on the outside of the drive shaft. The length of the fan blades is greater than the radius of the filter element.

[0009] Preferably, a connecting plate is connected to the bottom of the chassis, and a brush roller is rotatably connected to the connecting plate via a rotating shaft, and the cleaning brush on the brush roller moves against the inner wall of the filter cylinder.

[0010] Preferably, the bottom of the filter cylinder is inverted conical, and a cap is provided on the outer side of the bottom of the filter cylinder, and the cap is threadedly connected to the bottom of the filter cylinder.

[0011] Preferably, a baffle is installed on the inner wall of the filter cylinder, and the baffle is parallel to the brush roller.

[0012] Preferably, the rotary joint is a high-speed rotary joint, and the rotary joint is a contact seal.

[0013] Preferably, the diameter of the brush roller is smaller than the inner diameter of the suction pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model combines a filter element, a drive motor, a drive shaft, a chassis, a top plate, a negative pressure pump, an extraction pipe, and a rotary joint. When the filter element is filtering, the drive motor is started. Since the chassis and the extraction pipe are connected by a rotary joint, the drive motor can rotate the filter element without affecting the negative pressure pump, which generates negative pressure to extract gas through the filter element. Centrifugal force can remove impurities adsorbed on the outer surface of the filter element, thus ensuring the cleanliness of the filter element surface and preventing filter element blockage from affecting the gas filtration efficiency and effect. No personnel need to stop the machine for cleaning, which is quite convenient.

[0016] 2. This utility model combines fan blades, a connecting plate, a brush roller, and a baffle. When the drive motor rotates the filter element, the chassis rotates the connecting plate and the brush roller. The brush roller cleans the impurities adhering to the inner wall of the filter cylinder (impurities on the outer surface of the filter element detach and are adsorbed onto the inner wall of the filter cylinder due to centrifugal force). At this time, the fan blades rotate as well, blowing air downwards to collect the cleaned impurities at the bottom of the filter cylinder. As the brush roller rotates to clean the inner wall of the filter cylinder, its continuous rotation ensures that the cleaning brushes on it continuously contact the baffle. When the cleaning brushes pass the baffle, they vibrate, cleaning the adsorbed impurities and ensuring their cleanliness. This further improves the cleaning effect of the impurities adhering to the inner wall of the filter cylinder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the internal structure of the filter cartridge of this utility model.

[0019] Figure 3 This is a schematic diagram of the connection structure between the cap and the filter element of this utility model.

[0020] In the diagram: 1. Freeze dryer body; 11. Suction pipe; 2. Filter cartridge; 21. Sealing cap; 22. Cylinder cover; 23. Baffle; 3. Negative pressure pump; 31. Suction pipe; 32. Chassis; 33. Rotary joint; 4. Drive motor; 41. Drive shaft; 42. Fan blades; 43. Top plate; 5. Connecting plate; 51. Brush roller; 6. Filter element. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Example 1: A self-cleaning device for the exhaust filtration equipment of a freeze dryer, see [link to example]. Figures 1 to 3 The system includes a freeze dryer body 1 mounted on a base plate and a filtration mechanism. The filtration mechanism includes a filter cylinder 2 mounted on the base plate. A cylinder cover 22 is bolted to the top opening of the filter cylinder 2. A filter element 6 is installed inside the filter cylinder 2. An air suction pipe 11 is connected between the freeze dryer body 1 and the filter cylinder 2. A rigid suction pipe 31 is installed on the lower side of the end of the filter cylinder 2 away from the air suction pipe 11. The other end of the suction pipe 31 is connected to a negative pressure pump 3. A drive motor 4 is installed on the cylinder cover 22. The drive end of the drive motor 4 is connected to the drive shaft 41 via a coupling. The drive shaft 41 rotates through the cylinder cover 22 and is connected to the top plate 43. The top plate 43 is connected to the top of the filter element 6 via bolts. The bottom of the filter element 6 is connected to the base plate 32 via bolts. The air extraction pipe 31 passes through the filter cylinder 2 and is connected to the bottom of the base plate 32 via a rotary joint 33. The rotary joint 33 communicates with the inner cavity of the filter element 6. The rotary joint 33 is a high-speed rotary joint 33 and is a contact seal.

[0023] During operation, the material to be processed is placed in the freezing chamber of the freeze dryer body 1. Temperature and humidity are then controlled using liquid nitrogen or refrigerant, causing the moisture inside the material to rapidly freeze into ice crystals. The negative pressure pump 3 is then activated to create a vacuum environment in the freezing chamber. At this point, heating causes the ice crystals on the material surface to sublimate directly from a solid state to a gaseous state. Because the pressure inside the freeze dryer body 1 is reduced to an extremely low level, the ice crystals can directly sublimate into water vapor without passing through a liquid water stage. This vapor is then drawn into the filter cartridge 2, filtered through the filter element 6, and discharged into the working environment. After sublimation drying, the temperature is further increased to promote the removal of residual water from the material. The bound water evaporates and is removed, which further reduces the residual moisture in the material and achieves the final drying effect. When the filter element 6 is filtering, the drive motor 4 is started. Since the chassis 32 and the air extraction pipe 31 are connected by a rotary joint 33, the drive motor 4 can drive the filter element 6 to rotate without affecting the operation of the negative pressure pump 3 to generate negative pressure to extract gas through the filter element 6 for filtration. The centrifugal force can remove the impurities adsorbed on the outer surface of the filter element 6, thereby ensuring the cleanliness of the filter element 6 surface and avoiding clogging of the filter element 6, which would affect the gas filtration efficiency and effect. No personnel need to stop the machine for cleaning, which is more convenient.

[0024] For details, see Figure 2 and Figure 3 Three fan blades 42 are mounted on the drive shaft 41 above the top plate 43, and the three fan blades 42 are equidistantly distributed on the outer side of the drive shaft 41. The length of each fan blade 42 is greater than the radius of the filter element 6. A connecting plate 5 is connected to the bottom of the base plate 32, and a brush roller 51 is rotatably connected to the connecting plate 5 via a rotating shaft. The cleaning brush on the brush roller 51 moves against the inner wall of the filter cylinder 2. A baffle 23 is installed on the inner wall of the filter cylinder 2, and the baffle 23 is parallel to the brush roller 51. When the drive motor 4 drives the filter element 6 to rotate, the base plate 32 drives the connecting plate 5 and the brush roller 51 to rotate, so that the brush roller 51 can clean the impurities (filter element 6) adhering to the inner wall of the filter cylinder 2. Impurities on the outer surface detach (due to centrifugal force, the impurities are thrown off the filter element 6 and adsorbed onto the inner wall of the filter cylinder 2) for cleaning. At this time, the fan blades 42 rotate, so that the fan blades 42 can blow air downwards, thereby blowing the cleaned impurities downwards to the bottom of the inner cavity of the filter cylinder 2 for collection. When the brush roller 51 rotates to clean the inner wall of the filter cylinder 2, the brush roller 51 rotates continuously, so that the cleaning brush on the brush roller 51 can continuously contact the baffle 23. When the cleaning brush on the brush roller 51 passes the baffle 23, the cleaning brush on the brush roller 51 vibrates and cleans the impurities adsorbed on the cleaning brush, thereby ensuring that the cleaning brush on the brush roller 51 is clean and further improving the cleaning effect of the impurities adhering to the inner wall of the filter cylinder 2.

[0025] It is worth noting that, see Figure 2The diameter of the brush roller 51 is smaller than the inner diameter of the suction pipe 11. This is to prevent the brush roller 51 from blocking the connection between the suction pipe 11 and the filter cylinder 2 when it rotates to the connection point. This ensures that the negative pressure pump 3 can draw water vapor from the freeze dryer body 1 into the filter cylinder 2 for filtration through the filter element 6.

[0026] It is worth noting that, see Figure 1 The bottom of the filter cylinder 2 is inverted conical, and a cover 21 is provided on the outer side of the bottom of the filter cylinder 2. The cover 21 is threadedly connected to the bottom of the filter cylinder 2. The cover 21 can be easily removed by twisting it, which facilitates the cleaning of impurities collected at the bottom of the inner cavity of the filter cylinder 2.

[0027] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

[0028] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A self-cleaning device of a freeze-dryer exhaust filter apparatus, comprising a freeze-dryer body (1) and a filter mechanism provided on a base plate, characterized in that, The filtration mechanism includes a filter cylinder (2) mounted on the base plate. The top opening of the filter cylinder (2) is connected to a cylinder cover (22) by bolts. A filter element (6) is installed inside the filter cylinder (2). There is an air suction pipe (11) between the freeze dryer body (1) and the filter cylinder (2). A rigid air extraction pipe (31) is installed on the lower side of the end of the filter cylinder (2) away from the air suction pipe (11). The other end of the air extraction pipe (31) is connected to a negative pressure pump (3). A drive motor (4) is installed on the cylinder cover (22). The drive end of the drive motor (4) is connected to a drive shaft (41) via a coupling. The drive shaft (41) rotates through the cylinder cover (22) and is connected to a top plate (43). The top plate (43) is connected to the top of the filter element (6) via bolts. The bottom of the filter element (6) is connected to a base plate (32) via bolts. The air extraction pipe (31) passes through the filter cylinder (2) and is connected to the bottom of the base plate (32) via a rotary joint (33). The rotary joint (33) communicates with the inner cavity of the filter element (6).

2. A self-cleaning device for a lyophilizer exhaust filter apparatus as defined in claim 1, wherein, Fan blades (42) are installed on the drive shaft (41) above the top plate (43). There are three fan blades (42), and the three fan blades (42) are equidistantly distributed on the outside of the drive shaft (41). The length of the fan blades (42) is greater than the radius of the filter element (6).

3. A self-cleaning device for a lyophilizer exhaust filter apparatus as defined in claim 1, wherein, The bottom of the chassis (32) is connected to a connecting plate (5), and a brush roller (51) is rotatably connected to the connecting plate (5) via a rotating shaft, and the cleaning brush on the brush roller (51) moves against the inner wall of the filter cylinder (2).

4. A self-cleaning device for a lyophilizer exhaust filter apparatus as defined in claim 3, wherein, The filter cylinder (2) is equipped with a baffle (23) on its inner wall, and the baffle (23) is parallel to the brush roller (51).

5. A self-cleaning device for a lyophilizer exhaust filter apparatus as defined in claim 1, wherein, The rotary joint (33) is a high-speed rotary joint (33), and the rotary joint (33) is a contact seal.

6. The self-cleaning device for the exhaust filtration equipment of a freeze dryer as described in claim 3, characterized in that, The diameter of the brush roller (51) is smaller than the inner diameter of the suction pipe (11).

7. A self-cleaning device for a lyophilizer exhaust filter apparatus as defined in claim 1, wherein, The bottom of the filter cylinder (2) is inverted conical, and a cover (21) is provided on the outer side of the bottom of the filter cylinder (2), and the cover (21) is threadedly connected to the bottom of the filter cylinder (2).

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