Plasma gas-liquid mixed solution generator suitable for sterilization and preservation of agricultural products
By designing a plasma gas-liquid miscible generator, high-speed gas and cooling water are used to mix it with plasma gas-liquid miscible, the problems of high cost and high temperature of plasma sterilization equipment are solved, and efficient sterilization and preservation of agricultural products are achieved.
Patent Information
- Application Number
- CN202422326072.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The existing plasma sterilization technology has problems such as high equipment cost, high temperature or poor effect in preserving agricultural products, especially the high cost of inert gas sterilization and inconvenient preparation and use of plasma active water.
A plasma gas-liquid miscible generator is designed to use a structure of a negative pressure chamber and a mixing chamber to use high-speed gas to carry plasma and cool water to form a plasma gas-liquid miscible, with the temperature between plasma and plasma active water, achieving immediate sterilization.
It provides a plasma gas-liquid miscible with moderate temperature and good sterilization effect, which is suitable for instant sterilization and preservation of agricultural products, solves equipment cost and temperature problems and improves sterilization efficiency.
Smart Images
Figure CN223112814U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of physical sterilization, in particular to the field of food cold sterilization technology, and specifically refers to a plasma gas-liquid mixture generator suitable for sterilization and preservation of agricultural products. Background Art
[0002] As a new type of cold sterilization technology, plasma has received increasing attention in food preservation. However, the gas source of cold source plasma is generally an inert gas. Although the temperature can be controlled within the room temperature range, the cost of inert gas is relatively high, making it impossible to achieve commercial application.
[0003] Plasma-activated water is a liquid with sterilization performance produced by directly treating a liquid with plasma. However, there are currently two problems with plasma-activated water: 1) the temperature is low and the sterilization effect is poor; 2) it often needs to be prepared before use, so a storage device for activated water is required, making the equipment relatively large. And from preparation to use, it takes a certain amount of time, during which the effective sterilizing substances in the activated water will disappear and escape, further weakening the efficacy of plasma-activated water. At the same time, if plasma sterilization is directly used, the effect is good, but the temperature is high, which is not suitable for the sterilization and preservation of agricultural products. Summary of the Utility Model
[0004] Aiming at the deficiencies of the prior art, the utility model provides a plasma gas-liquid mixture generator suitable for sterilization and preservation of agricultural products, which can timely generate a plasma gas-liquid mixture with excellent sterilization performance and low temperature.
[0005] The utility model is realized by the following technical solutions. A plasma gas-liquid mixture generator suitable for sterilization and preservation of agricultural products includes a muzzle, a negative pressure chamber, a mixing chamber, and a diffusion port of a plasma generator that are connected in sequence and arranged collinearly. The negative pressure chamber is also connected to a liquid inlet pipe located below the negative pressure chamber and hermetically connected to the negative pressure chamber. The negative pressure chamber is hermetically connected to the muzzle.
[0006] When the utility model is in use, after the gas enters the plasma generator, it carries the plasma and enters the negative pressure chamber from the muzzle, and flows through the mixing chamber and the diffusion port. The high-speed flowing gas creates a negative pressure in the negative pressure chamber, and the cooling water in the liquid inlet pipe is adsorbed into the negative pressure chamber and mixed with the gas in the mixing chamber. At this time, the cooling water cools the plasma in the gas and forms a plasma gas-liquid mixture, which is finally ejected from the diffusion port; the temperature of the plasma gas-liquid mixture is between that of the plasma and the plasma-activated water, and the plasma still has a good sterilization effect. At the same time, the plasma gas-liquid mixture is prepared at any time, which is convenient for the sterilization and preservation of agricultural products.
[0007] Preferably, an opening for inserting the barrel of the plasma generator is provided on the negative pressure chamber. A conical nozzle adapted to the shape of the muzzle is connected to the opening and is located inside the negative pressure chamber. A conical gasket is provided between the nozzle and the muzzle.
[0008] In this preferred embodiment, through the setting of the conical nozzle, the contact area between the nozzle and the muzzle is increased, and the contact area of the gasket is also increased, thus making the sealing effect better. At the same time, the setting of the gasket also plays a buffering role. Meanwhile, the setting of the nozzle also facilitates guiding the muzzle to insert into the negative pressure chamber.
[0009] Preferably, the small-diameter end of the nozzle is connected to a flow-restricting and pressure-increasing throat located in front of the muzzle. The flow-restricting and pressure-increasing throat includes a reducing section with a gradually decreasing inner diameter, a narrow section, and an expanding section with a gradually increasing inner diameter. The small-diameter end of the reducing section and the small-diameter end of the expanding section are respectively connected to both ends of the narrow section. The large-diameter end of the reducing section is connected to the nozzle. The narrowest part of the inner diameter of the flow-restricting and pressure-increasing throat is located in the narrow section.
[0010] In this preferred solution, during use, through the setting of the reducing section and the narrow section, the area of the gas flow channel is gradually reduced, increasing the plasma flow rate and facilitating the creation of negative pressure. At the same time, the setting of the expanding section is used to prevent the cooling water from flowing back into the plasma generator.
[0011] Preferably, the reducing section, the narrow section, and the expanding section transition along an arc.
[0012] This preferred solution facilitates reducing the resistance during gas flow, thus facilitating the flow of gas.
[0013] Preferably, the flow-restricting and pressure-increasing throat is also provided between the liquid inlet pipe and the negative pressure chamber, and the flow-restricting and pressure-increasing throat is hermetically connected to both the liquid inlet pipe and the negative pressure chamber.
[0014] In this preferred solution, during use, the flow-restricting and pressure-increasing throat changes the water pressure, promoting the atomization of the water body. The atomized water mixes more fully with the plasma in the air. At the same time, it also isolates the negative pressure chamber and the liquid inlet pipe, improving the safety of the equipment.
[0015] Preferably, a sensor for monitoring the water level is also provided on the liquid inlet pipe. In this preferred solution, through the setting of the sensor, it is convenient to monitor the water level in the liquid inlet pipe.
[0016] Preferably, the negative pressure chamber is also connected to an overflow pipe extending downward, and a check valve is provided on the overflow pipe.
[0017] In this preferred solution, through the setting of the overflow valve, it is convenient to discharge the unatomized or excessive liquid from the negative pressure chamber.
[0018] Preferably, both the mixing chamber and the diffusion port are conical, and the large-diameter end of the mixing chamber is connected to the small-diameter end of the diffusion port.
[0019] In this preferred solution, the mixing chamber is conically arranged to accelerate the gas-liquid mixing. At the same time, the diffusion port is conically arranged to reduce the air pressure, making the spraying of the plasma gas-liquid mixture more gentle.
[0020] The beneficial effects of the present utility model are as follows: After the gas enters the plasma generator, it carries the plasma and enters the negative pressure chamber from the muzzle of the gun, and flows through the mixing chamber and the diffusion port. The high-speed flowing gas generates negative pressure in the negative pressure chamber, and the cooling water in the liquid inlet pipe is adsorbed and enters the negative pressure chamber, and mixes with the gas in the mixing chamber. At this time, the cooling water cools down the plasma in the gas and forms a plasma gas-liquid mixture, which is finally ejected from the diffusion port; The temperature of the plasma gas-liquid mixture is between the plasma and the plasma-activated water, and the plasma still has a good bactericidal effect. At the same time, the plasma gas-liquid mixture is prepared at any time, which is convenient for the sterilization and preservation of agricultural products; Through the settings of the constriction section and the narrow section, the area of the gas flow channel is gradually reduced, the plasma flow rate is increased, and it is convenient to create negative pressure; At the same time, the flared section is provided to prevent the cooling water from flowing back into the plasma generator. Description of the Drawings
[0021] Figure 1 It is a schematic structural diagram of the present utility model;
[0022] As shown in the figure:
[0023] 1. Pipe orifice, 2. Sealing gasket, 3. Sealing ring, 4. Flow-restricting and pressure-increasing notch connected to the pipe orifice, 5. Outer shell, 6. Overflow pipe, 7. Check valve, 8. Sensor, 9. Liquid inlet pipe, 10. Sealing ring, 11. Flow-restricting and pressure-increasing notch connected to the liquid inlet pipe, 12. Negative pressure chamber, 13. Mixing chamber, 14. Diffusion port, 15. Plasma generator, 16. Air passage, 17. Discharge needle. Detailed Implementation Modes
[0024] To clearly illustrate the technical features of this solution, the following is an elaboration of this solution through specific implementation modes.
[0025] Referring to the attached Figure 1 , a plasma gas-liquid mixture generator for agricultural product sterilization and preservation of the present utility model includes an outer shell 5. Inside the outer shell 5, a negative pressure chamber 12, a mixing chamber 13, and a diffusion port 14 are arranged in sequence and coaxially. Outside the outer shell 5, a plasma generator 15 is provided. The muzzle of the plasma generator 15, the negative pressure chamber 12, the mixing chamber 13, and the diffusion port 14 are connected in sequence and coaxially. Both the mixing chamber 13 and the diffusion port 14 are conical. The large-diameter end of the mixing chamber 13 is connected to the small-diameter end of the diffusion port 14. The negative pressure chamber 12, the mixing chamber 13, and the diffusion port 14 are all located.
[0026] An opening for inserting the barrel of the plasma generator 15 is formed on the negative pressure chamber 12. A conical nozzle 1 located inside the negative pressure chamber 12 and adapted to the shape of the muzzle is connected to the opening. A conical gasket 2 is provided between the nozzle 1 and the muzzle, and a sealing ring 3 is provided between the nozzle 1 and the opening.
[0027] The small-diameter end of the nozzle 1 is connected to a flow-restricting and pressure-increasing throat located in front of the muzzle. The flow-restricting and pressure-increasing throat includes a reduced-diameter section, a narrow section, and an enlarged-diameter section connected in sequence. The inner diameter of the reduced-diameter section gradually decreases along the gas flow direction, and the inner diameter of the enlarged-diameter section gradually increases along the gas flow direction.
[0028] The small-diameter end of the reduced-diameter section and the small-diameter end of the enlarged-diameter section are respectively connected to both ends of the narrow section. The large-diameter end of the reduced-diameter section is connected to the nozzle 1. The narrowest part of the inner diameter of the flow-restricting and pressure-increasing throat is located in the narrow section. The outer diameters of the reduced-diameter section, the narrow section, and the enlarged-diameter section are the same and the reduced-diameter section, the narrow section, and the enlarged-diameter section are in arc transition. The flow-restricting and pressure-increasing throat is made of ceramic material.
[0029] A liquid inlet pipe 9 is further provided below the negative pressure chamber 12. A flow-restricting and pressure-increasing throat is provided between the liquid inlet pipe 9 and the negative pressure chamber 12. The flow-restricting and pressure-increasing throat and the negative pressure chamber 12 are both hermetically connected and hermetically connected to the liquid inlet pipe 9 through a sealing ring 10. A sensor 8 for monitoring the water level is further provided on the liquid inlet pipe 9.
[0030] The negative pressure chamber 12 is further connected to an overflow pipe 6 extending downward. A check valve 7 is provided on the overflow pipe 6.
[0031] In particular, since the cooling water is atomized, the plasma gas-liquid mixture also becomes a plasma-activated mist. Refer to the appendix Figure 1 , with the left side being the rear and the right side being the front, and the air flowing from the rear to the front.
[0032] When the present utility model is in use, after gas enters the plasma generator 15, it carries the plasma into the negative pressure chamber 12 from the muzzle, and flows through the mixing chamber 13 and the diffusion port 14. The high-speed flowing gas enters the negative pressure chamber 12 after being accelerated by the flow-restricting and pressure-increasing throat, causing a negative pressure in the negative pressure chamber 12. Under the influence of the negative pressure, the cooling water in the liquid inlet pipe 9 upwardly passes through the flow-restricting and pressure-increasing throat and is atomized. The atomized cooling water enters the negative pressure chamber 12 and mixes with the gas in the mixing chamber 13. At this time, the cooling water cools down the plasma in the gas and forms a plasma gas-liquid miscible body, which is finally ejected from the diffusion port 14; the temperature of the plasma gas-liquid miscible body is between that of the plasma and the plasma-activated water, and the plasma still has a good sterilization effect. At the same time, the plasma gas-liquid miscible body is prepared at any time, which is convenient for the sterilization and preservation of agricultural products; through the setting of the constriction section and the narrow section, the area of the gas flow passage is gradually reduced, the plasma flow rate is increased, and it is convenient to create a negative pressure; at the same time, the setting of the flared section is used to prevent the cooling water from flowing back into the plasma generator 15. In order to verify the sterilization effect of the plasma gas-liquid miscible body, the following experiments were carried out:
[0033] Sterilization experiments were carried out on four agricultural products: pig carcasses, shrimps, apples, and spinach. Among them, the untreated group was the control group and no treatment was carried out;
[0034] The plasma-activated water treatment group was to spray the samples with plasma-activated water for 1 minute;
[0035] The plasma treatment group was to directly treat the samples with a plasma generator for 1 minute;
[0036] The plasma-activated mist group: was to treat the samples with the equipment of the present utility model for 1 minute;
[0037] Then, 30 people were used to conduct a sensory evaluation of the samples after different treatments. The untreated group was used as a reference, with a full score of 30 points. At the same time, the total number of colonies and the surface temperature of the samples were recorded, and the following charts were obtained:
[0038]
[0039] From the above charts, it can be concluded that under the same sample, the total number of colonies of the samples treated by the plasma-activated mist group is the smallest, proving that its sterilization effect is relatively good. At the same time, the surface temperature of the samples is also between that of the plasma-activated water treatment group and the plasma treatment group.
[0040] Of course, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopt the prior art, and will not be elaborated here. The above embodiments and accompanying drawings are only used to illustrate the technical solutions of the present utility model and are not a limitation to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the technical field within the substantial scope of the present utility model do not depart from the gist of the present utility model and should also fall within the scope of protection of the claims of the present utility model.
Claims
1. A plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products, characterized in that: It includes the muzzle of a plasma generator (15), a negative pressure chamber (12), a mixing chamber (13), and a diffusion port (14) that are connected in sequence and arranged collinearly. The negative pressure chamber (12) is also connected to a liquid inlet pipe (9) located below the negative pressure chamber (12) and hermetically connected to the negative pressure chamber (12). The negative pressure chamber (12) is hermetically connected to the muzzle.
2. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 1, characterized in that: An opening for inserting the barrel of the plasma generator (15) is provided on the negative pressure chamber (12). A conical nozzle (1) located inside the negative pressure chamber (12) and adapted to the shape of the muzzle is connected to the opening. A conical gasket (2) is provided between the nozzle (1) and the muzzle.
3. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 2, characterized in that: The small-diameter end of the nozzle (1) is connected to a flow-restricting and pressure-increasing throat in front of the muzzle. The flow-restricting and pressure-increasing throat includes a constriction section with a gradually decreasing inner diameter, a narrow section, and a flare section with a gradually increasing inner diameter. The small-diameter ends of the constriction section and the flare section are respectively connected to both ends of the narrow section. The large-diameter end of the constriction section is connected to the nozzle (1). The narrowest inner diameter of the flow-restricting and pressure-increasing throat is located in the narrow section.
4. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 3, characterized in that: The constriction section, the narrow section, and the flare section are transitioned along an arc.
5. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 3, characterized in that: The flow-restricting and pressure-increasing throat is also provided between the liquid inlet pipe (9) and the negative pressure chamber (12). The flow-restricting and pressure-increasing throat is hermetically connected to both the liquid inlet pipe (9) and the negative pressure chamber (12).
6. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 1, characterized in that: A sensor (8) for monitoring the water level is also provided on the liquid inlet pipe (9).
7. The plasma gas-liquid mixed solution generator applicable to the sterilization and preservation of agricultural products according to claim 1, characterized in that: The negative pressure chamber (12) is also connected to an overflow pipe (6) extending downward. A one-way valve (7) is provided on the overflow pipe (6).
8. The plasma gas-liquid mixture generator applicable to the sterilization and preservation of agricultural products according to claim 1, characterized in that: Both the mixing chamber (13) and the diffusion port (14) are conical. The large-diameter end of the mixing chamber (13) is connected to the small-diameter end of the diffusion port (14).