Multi-medium cleaning device with disinfection and sterilization functions and sealed process tank body

The multi-media cleaning device using clean steam and purified water solves the problems of incomplete cleaning and disinfection of cosmetic emulsification pots, achieving disinfection without dead angles and water and energy saving.

CN224222261UActive Publication Date: 2026-05-12SHANGHAI FOREST CABIN BIOLOGICAL-TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI FOREST CABIN BIOLOGICAL-TECH CO LTD
Filing Date
2025-05-30
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing methods for cleaning and disinfecting cosmetic emulsifying pots suffer from problems such as incomplete cleaning, incomplete disinfection, high consumption of purified water, and a lack of effective sterilization devices.

Method used

A multi-media cleaning device using clean steam, purified water, and clean compressed air is employed. After the material is softened by clean steam, the residual material is rinsed off with purified water. The device is then sprayed with a combination of clean steam and clean compressed air to achieve thorough disinfection and sterilization of the pot body.

Benefits of technology

It effectively saves purified water consumption, achieves thorough disinfection and sterilization inside the boiler, reduces cleaning time and resource consumption, and improves cleaning efficiency.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model provides a multi-medium cleaning device with disinfection and sterilization functions and a sealed process tank, the cleaning device is used for cleaning and disinfection of the sealed process tank, and the cleaning device comprises a clean steam source, a purified water source, a purified water pipeline, a clean steam pipeline, a multi-medium pipeline and a spraying device; the purified water source is communicated with the multi-medium pipeline through a purified water pipeline, a valve is mounted on the purified water pipeline, and the purified water source conveys purified water through the purified water pipeline and the multi-medium pipeline; the clean steam source is communicated with the multi-medium pipeline through a clean steam pipeline, a valve is mounted on the clean steam pipeline, and the clean steam source conveys clean steam through the clean steam pipeline and the multi-medium pipeline; according to the utility model, the clean steam pipeline is additionally arranged, after materials are softened by the clean steam, the residual materials are washed by using purified water, so that the use amount of the purified water can be effectively saved, and meanwhile, the washed pot body is disinfected and sterilized by the clean steam, so that no-dead-corner disinfection and sterilization inside the pot body can be realized.
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Description

Technical Field

[0001] This utility model relates to the field of cosmetic emulsification production technology, specifically to a multi-media cleaning device and a sealed process tank with disinfection and sterilization functions. Background Technology

[0002] The equipment commonly used in the emulsification process of cosmetics includes a vacuum homogenizing emulsifier (referred to as an emulsifier), an aqueous phase pot, and an oil phase pot. Because cosmetics come in a wide variety of types, each emulsifier is not fixed to produce only one product, but rather needs to produce multiple varieties. Each time production is changed, cleaning and disinfection are required, necessitating significant manpower, electricity, and water resources.

[0003] Currently, there are two common methods for cleaning and disinfecting emulsifying tanks in the cosmetics industry: manual cleaning and disinfection, and CIP (Clean-In-Place) cleaning and disinfection. Both methods use purified water to clean the emulsifying tank, and then use the tank to heat water for high-temperature disinfection. However, both methods pose certain risks to operators: cleaning may leave unsanitary areas, resulting in incomplete cleaning; and incomplete disinfection can lead to microbial growth. Therefore, cleaning and disinfecting the emulsifying tank is the most critical step and a key factor in determining product quality.

[0004] Meanwhile, a search of existing patent documents revealed that patent document CN211413057U discloses a cleaning device for an emulsifying pot used in cosmetic production, and patent documents CN211437353U and CN216779762U disclose a cleaning equipment for an emulsifying pot used in cosmetic production. All of the above cleaning equipment have the following disadvantages: (1) a large amount of purified water is used; (2) there is a lack of a disinfection and sterilization device after cleaning. Utility Model Content

[0005] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a multi-media cleaning device and a sealed process tank with disinfection and sterilization functions.

[0006] According to the present invention, a multi-media cleaning device with disinfection and sterilization function is provided. The cleaning device is used for cleaning and disinfecting sealed process tanks. The cleaning device includes a clean steam source, a purified water source, a purified water pipeline, a clean steam pipeline, a multi-media pipeline, and a spray device.

[0007] The purified water source is connected to the multi-media pipeline through a purified water pipeline, and a valve is installed on the purified water pipeline. The purified water source is used to deliver purified water to the spray device through the purified water pipeline and the multi-media pipeline.

[0008] The clean steam source is connected to the multi-media pipeline through a clean steam pipeline, and a valve is installed on the clean steam pipeline. The clean steam source is used to deliver clean steam to the spray device through the clean steam pipeline and the multi-media pipeline.

[0009] The spraying device is installed inside the tank to be cleaned. During cleaning, the valve on the clean steam pipeline is closed and the valve on the purified water pipeline is opened, and the spraying device sprays purified water. During disinfection, the valve on the clean steam pipeline is opened and the valve on the purified water pipeline is closed, and the spraying device sprays clean steam.

[0010] Preferably, it also includes a clean compressed air source and a clean compressed air pipeline;

[0011] The clean compressed air source is connected to the multi-media pipeline through a clean compressed air pipeline, and a valve is installed on the clean compressed air pipeline. The clean compressed air source is used to deliver clean compressed air to the spray device through the clean compressed air pipeline and the multi-media pipeline.

[0012] During the drying process, the valves on the clean steam pipeline and the purified water pipeline are closed, while the valve on the clean compressed air pipeline is opened, and the spray device sprays clean compressed air.

[0013] Preferably, a manual diaphragm valve is provided at the connection between the purified water pipeline and the multi-media pipeline to control the opening and closing of the purified water pipeline and the multi-media pipeline;

[0014] Manual valves are installed at the connection points between the clean steam pipeline and the multi-media pipeline, and at the connection points between the clean compressed air pipeline and the multi-media pipeline, to control the opening and closing of the clean steam pipeline and the multi-media pipeline, and the clean compressed air pipeline and the multi-media pipeline.

[0015] Preferably, a pressure regulating valve is also provided at the connection between the clean compressed air pipeline and the multi-media pipeline to adjust the delivery flow rate of the clean compressed air.

[0016] Preferably, it also includes a control panel, wherein an automatic diaphragm valve is provided at the connection between the purified water pipeline and the multi-media pipeline;

[0017] A first automatic valve is installed at the connection between the clean steam pipeline and the multi-media pipeline, and at the connection between the clean compressed air pipeline and the multi-media pipeline. The first automatic valve and the automatic diaphragm valve are connected to the control panel through control lines.

[0018] The control panel is used to control the opening and closing of the first automatic valve and the automatic diaphragm valve, thereby controlling the delivery sequence of purified water, clean compressed air and clean steam.

[0019] Preferably, the purified water source includes a primary purified water source, a secondary purified water source, and a thermal purified water source, wherein the thermal purified water source is used to provide purified water at a temperature above 85°C.

[0020] The purified water pipeline includes a primary purified water pipeline, a secondary purified water pipeline, and a hot purified water pipeline. The primary purified water source, the secondary purified water source, and the hot purified water source are respectively connected to the multi-media pipeline through the primary purified water pipeline, the secondary purified water pipeline, and the hot purified water pipeline.

[0021] The primary purified water pipeline, the secondary purified water pipeline, and the hot purified water pipeline are all equipped with jet pumps, which are connected to the control panel via control lines.

[0022] Preferably, a second automatic valve is provided at the connection between the multi-media pipeline and the spraying device, and the second automatic valve is connected to the control panel via a control circuit.

[0023] The sealed process tank provided by this utility model includes the tank body and the multi-media cleaning device with disinfection and sterilization function.

[0024] The spraying device is installed at the top of the tank and is connected to a multi-media pipeline via a shared sanitary hose.

[0025] Preferably, the bottom of the tank is connected to an external circulation pipe of a homogenizer, and a high-pressure circulating cleaning pump is installed on the external circulation pipe of the homogenizer;

[0026] The two ends of the homogenizer's external circulation pipe are connected to the bottom of the tank and the connection point between the shared sanitary hose and the multi-media pipeline, respectively.

[0027] Preferably, a drain pipe is provided at the connection between the external circulation pipe of the homogenizer and the bottom of the tank.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This utility model adds a clean steam pipeline, which sprays the pot body with clean steam and purified water in sequence. After the clean steam softens the material, the purified water is used to rinse away the residual material, which can effectively save the amount of purified water used and achieve the effect of energy saving and emission reduction. At the same time, spraying the pot body with clean steam after rinsing can achieve disinfection and sterilization of the pot body without dead corners. Attached Figure Description

[0030] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0031] Figure 1 This is a schematic diagram of the overall structure of the multi-media cleaning device with disinfection and sterilization function in this utility model;

[0032] Figure 2 This is a schematic diagram of the overall structure of the emulsifying pot in this utility model.

[0033] The diagram shows:

[0034] Multi-media pipeline 1; Hot purified water pipeline 11

[0035] First automatic valve 2, manual diaphragm valve 12

[0036] Jet pump 3 Automatic diaphragm valve 13

[0037] Control Panel 4 Control Circuit 14

[0038] 5 manual valves and 15 shared sanitary hoses

[0039] Pressure regulating valve 6; Spraying device 16

[0040] Clean compressed air pipeline 7; Homogenizer external circulation pipeline 17

[0041] 8 clean steam pipes and 18 sewage pipes

[0042] Primary purified water pipeline 9; circulating cleaning high-pressure pump 19

[0043] Secondary purified water pipeline 10, second automatic valve 20 Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0045] This utility model discloses a multi-media cleaning device and a sealed process tank with disinfection and sterilization functions. Based on the original cleaning device, a clean steam pipeline is added, and the tank body is sprayed with clean steam and purified water in sequence. After the clean steam softens the material, the purified water is used to rinse the residual material, which can effectively save the amount of purified water used. At the same time, the clean steam sprays the rinsed tank body to achieve disinfection and sterilization of the tank body without dead corners.

[0046] According to the multi-media cleaning device with disinfection and sterilization function provided by this utility model, the cleaning device is used for cleaning and disinfecting sealed process tanks, such as... Figure 1 As shown, the cleaning device includes a clean steam source, a purified water source, a purified water pipeline, a clean steam pipeline 8, a multi-media pipeline 1, and a spray device 16; the purified water source is connected to the multi-media pipeline 1 through the purified water pipeline, and a valve is installed on the purified water pipeline. The purified water source is used to deliver purified water to the spray device 16 through the purified water pipeline and the multi-media pipeline 1.

[0047] The clean steam source is connected to the multi-media pipeline 1 through the clean steam pipeline 8, and a valve is installed on the clean steam pipeline 8. The clean steam source is used to deliver clean steam to the spray device 16 through the clean steam pipeline 8 and the multi-media pipeline 1. The spray device 16 is installed inside the tank to be cleaned. During cleaning, the valve on the clean steam pipeline 8 is closed and the valve on the purified water pipeline is opened, and the spray device 16 sprays purified water. During disinfection, the valve on the clean steam pipeline 8 is opened and the valve on the purified water pipeline is closed, and the spray device 16 sprays clean steam.

[0048] This invention introduces a spraying device that sequentially feeds clean steam and purified water into the spraying device. After the clean steam softens the material, the purified water is used to rinse away any remaining material, which effectively saves on the amount of purified water used. At the same time, the clean steam sprays the rinsed pot body, achieving thorough disinfection and sterilization of the pot body without any dead corners.

[0049] The cleaning device also includes a clean compressed air source and a clean compressed air pipeline 7; the clean compressed air source is connected to the multi-media pipeline 1 through the clean compressed air pipeline 7, and a valve is installed on the clean compressed air pipeline 7. The clean compressed air source is used to supply clean compressed air to the spray device 16 through the clean compressed air pipeline 7 and the multi-media pipeline 1; during drying, the valve on the clean steam pipeline 8 is closed, the valve on the purified water pipeline is closed, the valve on the clean compressed air pipeline 7 is opened, and the spray device 16 sprays clean compressed air.

[0050] In a preferred embodiment, a manual diaphragm valve 12 is installed at the connection between the purified water pipeline and the multi-media pipeline 1 to control the on / off state of the purified water pipeline and the multi-media pipeline 1; manual valves 5 are also installed at the connections between the clean steam pipeline 8 and the multi-media pipeline 1, and between the clean compressed air pipeline 7 and the multi-media pipeline 1, to control the on / off state of these connections. A pressure regulating valve 6 is also installed at the connection between the clean compressed air pipeline 7 and the multi-media pipeline 1 to adjust the flow rate of the clean compressed air.

[0051] In a preferred embodiment, the cleaning device further includes a control panel 4. An automatic diaphragm valve 13 is installed at the connection between the purified water pipeline and the multi-media pipeline 1. First automatic valves 2 are installed at the connections between the clean steam pipeline 8 and the multi-media pipeline 1, and at the connections between the clean compressed air pipeline 7 and the multi-media pipeline 1. The first automatic valves 2 and diaphragm valves 13 are connected to the control panel 4 via control lines 14. A second automatic valve 20 is installed at the connection between the multi-media pipeline 1 and the spray device 16, and the second automatic valve 20 is connected to the control panel 4 via control lines 14. The control panel 4 is used to control the opening and closing of the first automatic valves 2 and diaphragm valves 13, thereby controlling the delivery sequence of purified water, clean compressed air, and clean steam. Fully automatic operation can be achieved through the control panel 4; the cleaning process can be started with a single button and automatically shut off upon completion, simplifying operation for personnel.

[0052] The purified water source includes a primary purified water source, a secondary purified water source, and a thermal purified water source. The thermal purified water source is used to provide purified water at a temperature above 85°C. The purified water pipeline includes a primary purified water pipeline 9, a secondary purified water pipeline 10, and a thermal purified water pipeline 11. The primary purified water source, the secondary purified water source, and the thermal purified water source are respectively connected to the multi-media pipeline 1 through the primary purified water pipeline 9, the secondary purified water pipeline 10, and the thermal purified water pipeline 11. Each of the primary purified water pipeline 9, the secondary purified water pipeline 10, and the thermal purified water pipeline 11 is equipped with a jet pump 3. The jet pump 3 is connected to the control panel 4 through a control line 14.

[0053] According to the sealed process tank provided by this utility model, such as Figure 2 As shown, the system includes a tank and a multi-media cleaning device with disinfection and sterilization functions. The spray device 16 is installed at the top of the tank and connected to the multi-media pipeline 1 via a shared sanitary hose 15. A homogenizer external circulation pipeline 17 is connected to the bottom of the tank, and a high-pressure circulating cleaning pump 19 is installed on the homogenizer external circulation pipeline 17. Both ends of the homogenizer external circulation pipeline 17 are connected to the bottom of the tank and the connection point between the shared sanitary hose 15 and the multi-media pipeline 1, respectively. A drain pipe 18 is installed at the connection point between the homogenizer external circulation pipeline 17 and the bottom of the tank.

[0054] Example 1

[0055] This embodiment provides a multi-media device for cleaning and sterilizing emulsification equipment. It is applicable to sealed tanks such as emulsification pots, aqueous phase pots, and oil phase pots. The cleaning and sterilization process is automatically completed using the control panel of the multi-media device. The multi-media device achieves its function through steps including adding clean steam to soften the material in the emulsification pot, rinsing off residual material with hot purified water, primary purified water circulation for fine washing, secondary purified water for clean rinsing, clean steam sterilization, and drying with clean compressed air.

[0056] The control panel 4 is electrically connected to the first automatic valve 2, the high-pressure jet pump 3, the automatic diaphragm valve 13, and the circulating cleaning high-pressure pump 19. Clean compressed air is delivered through the clean compressed air pipeline 7, and controlled by the manual valve 5 and the pressure regulating valve 6. It is then connected to the multi-media pipeline 1 via the first automatic valve 2 for use. Clean steam at 121°C is delivered through the clean steam pipeline 8, controlled by the manual valve 5, and then connected to the multi-media pipeline via the first automatic valve 2 for use. The primary purified water, secondary purified water, and 85°C hot purified water are delivered through the high-pressure jet pump 3, controlled by the manual diaphragm valve 12, and then connected to the multi-media pipeline via the automatic diaphragm valve 13 for use.

[0057] The multi-media pipeline 1 is connected to a shared sanitary hose 15 via a second automatic valve 20, allowing the various media to enter the emulsifying pot separately for cleaning and sterilization. The shared sanitary hose 15 connects to a spray pipe on the emulsifying pot, which in turn connects to a high-pressure spray ball. The high-pressure spray ball is spherical and can rotate 360 ​​degrees during operation, ensuring that the emulsifying pot lid, both sides of the stirring blades, and both sides of the homogenizer are sprayed effectively. The water flow from the high-pressure spray ball can be converted into a jet or a mist, ensuring thorough cleaning of the emulsifying pot without any dead angles or material residue. The water pressure and time can be adjusted via the control panel 4. The homogenizer external circulation pipeline 17 is used for external circulation of the material during production and for cleaning the homogenizer.

[0058] A drain pipe 18 is also provided at the bottom of the pot. By controlling the automatic valve on the drain pipe 18, the cleaning wastewater in the emulsifying pot can be drained. A high-pressure circulating cleaning pump 17 is provided on the external circulation pipe 17 of the homogenizer. By controlling the automatic valve on the external circulation pipe 17 of the homogenizer, the emulsifying pot can be circulated and cleaned.

[0059] 121℃ clean steam flows through clean steam pipe 8, passes through manual valve 5, then through automatic valve 2 to multi-media pipe 1, and enters the shared sanitary hose 15. This hose connects to the spray pipe on the emulsifying pot and is then connected to the high-pressure spray ball, entering the emulsifying pot for disinfection and sterilization. Clean compressed air flows through clean compressed air pipe 7, passes through manual valve 5 and pressure regulating valve 6, then through the first automatic valve 2 to multi-media pipe 1, and enters the shared sanitary hose 15. This hose connects to the spray pipe on the emulsifying pot and is then connected to the high-pressure spray ball, entering the emulsifying pot for drying.

[0060] This invention provides a cleaning device with disinfection function, which reduces the amount of cleaning water used, achieving energy conservation and emission reduction. Taking the cleaning of a traditional 1000L emulsifying pot as an example, the disinfection water consumption is about 1500L, taking 1.5 hours. After introducing the above-mentioned cleaning device, the cleaning and disinfection water consumption for the emulsifying pot is about 500L, taking 0.5 hours. Water consumption and time are reduced by 66% simultaneously.

[0061] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0062] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A multi-media cleaning device with disinfection and sterilization function, characterized in that, The cleaning device is used for cleaning and disinfecting sealed process tanks. The cleaning device includes a clean steam source, a purified water source, a purified water pipeline, a clean steam pipeline (8), a multi-media pipeline (1), and a spray device (16). The purified water source is connected to the multi-media pipeline (1) through the purified water pipeline, and a valve is installed on the purified water pipeline. The purified water source is used to deliver purified water to the spray device (16) through the purified water pipeline and the multi-media pipeline (1). The clean steam source is connected to the multi-media pipeline (1) through the clean steam pipeline (8), and a valve is installed on the clean steam pipeline (8). The clean steam source is used to deliver clean steam to the spray device (16) through the clean steam pipeline (8) and the multi-media pipeline (1). The spray device (16) is installed inside the tank to be cleaned. During cleaning, the valve on the clean steam pipe (8) is closed and the valve on the purified water pipe is opened. The spray device (16) sprays purified water. During disinfection, the valve on the clean steam pipe (8) is opened and the valve on the purified water pipe is closed. The spray device (16) sprays clean steam.

2. The multi-media cleaning device with disinfection and sterilization function according to claim 1, characterized in that, It also includes a clean compressed air source and a clean compressed air pipeline (7); The clean compressed air source is connected to the multi-media pipeline (1) through the clean compressed air pipeline (7), and a valve is installed on the clean compressed air pipeline (7). The clean compressed air source is used to deliver clean compressed air to the spray device (16) through the clean compressed air pipeline (7) and the multi-media pipeline (1). During the drying process, the valve on the clean steam pipe (8) is closed, the valve on the purified water pipe is closed, the valve on the clean compressed air pipe (7) is opened, and the spray device (16) sprays clean compressed air.

3. The multi-media cleaning device with disinfection and sterilization function according to claim 2, characterized in that, A manual diaphragm valve (12) is provided at the connection between the purified water pipeline and the multi-media pipeline (1) to control the opening and closing of the purified water pipeline and the multi-media pipeline (1); Manual valves (5) are provided at the connection points of the clean steam pipeline (8) and the multi-media pipeline (1) and the clean compressed air pipeline (7) and the multi-media pipeline (1) to control the opening and closing of the clean steam pipeline (8) and the multi-media pipeline (1) and the clean compressed air pipeline (7) and the multi-media pipeline (1).

4. The multi-media cleaning device with disinfection and sterilization function according to claim 3, characterized in that, A pressure regulating valve (6) is also provided at the connection between the clean compressed air pipeline (7) and the multi-media pipeline (1) to adjust the delivery flow rate of the clean compressed air.

5. The multi-media cleaning device with disinfection and sterilization function according to claim 2, characterized in that, It also includes a control panel (4), and an automatic diaphragm valve (13) is provided at the connection between the purified water pipeline and the multi-media pipeline (1); A first automatic valve (2) is provided at the connection between the clean steam pipeline (8) and the multi-media pipeline (1) and at the connection between the clean compressed air pipeline (7) and the multi-media pipeline (1). The first automatic valve (2) and the automatic diaphragm valve (13) are connected to the control panel (4) through the control line (14). The control panel (4) is used to control the opening and closing of the first automatic valve (2) and the automatic diaphragm valve (13), thereby controlling the delivery sequence of purified water, clean compressed air and clean steam.

6. The multi-media cleaning device with disinfection and sterilization function according to claim 5, characterized in that, The purified water source includes a primary purified water source, a secondary purified water source, and a thermal purified water source, wherein the thermal purified water source is used to provide purified water at a temperature above 85°C. The purified water pipeline includes a primary purified water pipeline (9), a secondary purified water pipeline (10), and a hot purified water pipeline (11). The primary purified water source, the secondary purified water source, and the hot purified water source are respectively connected to the multi-media pipeline (1) through the primary purified water pipeline (9), the secondary purified water pipeline (10), and the hot purified water pipeline (11). A jet pump (3) is installed on the primary purified water pipeline (9), the secondary purified water pipeline (10), and the hot purified water pipeline (11). The jet pump (3) is connected to the control panel (4) through the control line (14).

7. The multi-media cleaning device with disinfection and sterilization function according to claim 5, characterized in that, A second automatic valve (20) is provided at the connection between the multi-media pipeline (1) and the spray device (16), and the second automatic valve (20) is connected to the control panel (4) through the control line (14).

8. A sealed process tank, characterized in that, Includes a tank and a multi-media cleaning device with disinfection and sterilization function as described in any one of claims 1-7; The spray device (16) is installed at the top of the tank and is connected to the multi-media pipeline (1) via a common sanitary hose (15).

9. The sealed process tank according to claim 8, characterized in that, The bottom of the tank is connected to a homogenizer external circulation pipe (17), and a high-pressure circulating cleaning pump (19) is installed on the homogenizer external circulation pipe (17); The two ends of the homogenizer external circulation pipe (17) are connected to the bottom of the tank and the connection point between the shared sanitary hose (15) and the multi-media pipe (1), respectively.

10. The sealed process tank according to claim 9, characterized in that, A drain pipe (18) is provided at the connection between the external circulation pipe (17) of the homogenizer and the bottom of the tank.