Water-cooling negative ion synergistic low-temperature plasma generating device

Abstract

The utility model relates to a water-cooling negative ion synergistic low-temperature plasma generating device, which is characterized in that a through hole communicated with a pipe cavity of a spray pipe is further formed in the spray pipe, the through hole is connected with a negative ion generator, a circumferentially closed conical ring cavity is formed in the pipe wall of a reducing section of the spray pipe, and the conical ring cavity is communicated with a cooling liquid tank through a liquid inlet pipe and a liquid outlet pipe. When the negative ion generator is used, the negative ion generator generates negative ions in the pipe cavity of the spray pipe, the negative ions flow along the air source, so that the concentration of the negative ions in the air source is increased, and the plasma generation principle is based on electron collapse, start of electron collapse and participation of a large number of electrons or charged particles. The presence of electrons can reduce the corona voltage of the plasma, so that the operation voltage of the plasma is reduced, the reduction of the voltage means lower temperature, and the increase of negative ions realizes the reduction of the voltage so as to achieve a cooling effect; and through the arrangement of the conical ring cavity, cooling liquid cools the reducing section where the spray point discharges, and the passive cooling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the field of cold sterilization, in particular to the field of plasma generation technology, and specifically refers to a water-cooled negative ion synergistic low-temperature plasma generation device. Background Art

[0002] Low-temperature plasma is a new cold sterilization technology, offering high efficiency, a broad spectrum, and a low-carbon, environmentally friendly approach. While there are various plasma generators, jet-type plasma generators are the most popular. Compared to other plasma generators, jet-type plasma offers superior sterilization effectiveness and produces higher effective ion concentrations. However, when using an air source as the plasma excitation source, the temperature rise is significant, which can adversely affect heat-sensitive foods.

[0003] As an efficient plasma generating device, jet plasma has the advantages of simple structure, wide applicability, and high plasma conversion efficiency. However, jet plasma mostly generates plasma through corona discharge or DBD discharge, which inevitably leads to temperature rise. First, long-term use causes the temperature of the jet plasma nozzle to be too high, causing internal concavity and convexity, thus affecting the service life of the nozzle; secondly, the plasma plume generated by the jet plasma is high in temperature, which will have an adverse effect on heat-sensitive foods. Utility Model Content

[0004] In response to the deficiencies of the prior art, the utility model provides a water-cooled negative ion synergistic low-temperature plasma generating device, which generates negative ions to reduce the voltage of plasma operation, thereby lowering the temperature, thereby achieving cooling. At the same time, coolant is used to cool the nozzle at the variable diameter section of the nozzle, thereby protecting the nozzle and preventing the plasma plume from being overheated.

[0005] The utility model is realized by the following technical scheme: a water-cooled negative ion synergistic low-temperature plasma generating device, comprising a nozzle and a discharge needle located in the nozzle, wherein the nozzle is further provided with a through-hole communicating with the nozzle lumen, and the through-hole is connected to a negative ion generator.

[0006] When the utility model is in use, negative ions are generated in the nozzle cavity by the negative ion generator, and the negative ions flow along the air source, thereby increasing the concentration of negative ions in the air source. The plasma generation principle is based on electron avalanche, and the start and progress of electron avalanche require the participation of a large number of electrons or charged particles. The presence of electrons can reduce the corona voltage of the plasma, so that the voltage of the plasma operation decreases. The voltage drop means a lower temperature. The increase of negative ions realizes the reduction of voltage, thereby achieving a cooling effect.

[0007] Preferably, a circumferentially closed conical ring cavity is provided in the wall of the nozzle reducing section, and the conical ring cavity is connected to the coolant tank through a liquid inlet pipe and a liquid outlet pipe.

[0008] In this preferred solution, the conical ring cavity is provided so that the coolant cools the variable diameter section of the discharge needle, thereby achieving a passive cooling effect.

[0009] Preferably, a valve is provided in the perforation. This preferred solution facilitates controlling the amount of negative ions entering and exiting the perforation through the provision of the valve, thereby adjusting the extent of active cooling.

[0010] Preferably, the perforation is connected to a negative ion cavity located in a negative ion box through a negative ion tube, the discharge end of the negative ion generator is located in the negative ion box, and a negative ion probe is also provided in the negative ion box.

[0011] This preferred solution facilitates the accumulation of negative ions by setting up a negative ion chamber. When in use, the negative ion generator is first turned on to fill the negative ion chamber with negative ions; and the negative ion probe is set up to facilitate the detection of negative ions.

[0012] Preferably, a temperature control probe is provided in the small diameter section of the nozzle. This preferred solution facilitates real-time temperature monitoring through the provision of the temperature control probe.

[0013] Preferably, the coolant tank is further provided with a liquid replenishing port and a liquid pump connected to the liquid inlet pipe.

[0014] In this preferred solution, the provision of the liquid replenishing port facilitates the replenishment of the coolant, and the provision of the liquid pump facilitates the entry of the coolant into the cone ring cavity.

[0015] The beneficial effects of the utility model are as follows: negative ions are generated in the nozzle cavity by the negative ion generator, and the negative ions flow along the air source, thereby increasing the concentration of negative ions in the air source. The plasma generation principle is based on electron avalanche, and the initiation and progress of electron avalanche require the participation of a large number of electrons or charged particles. The presence of electrons can reduce the corona voltage of the plasma, thereby reducing the voltage of the plasma operation. The voltage drop means a lower temperature. The increase in negative ions realizes the reduction of voltage, thereby achieving a cooling effect. Through the setting of the conical ring cavity, the coolant cools the variable diameter section of the discharge needle, thereby achieving a passive cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] As shown in the figure:

[0018] 1. Cone ring cavity, 2. Coolant tank, 3. Negative ion generator, 4. Liquid inlet pipe, 5. Liquid outlet pipe, 6. Temperature control probe, 7. Discharge needle, 8. Valve, 9. Negative ion box, 10. Negative ion probe, 11. Large diameter section, 12. Reduced diameter section, 13. Small diameter section, 14. Lumen. DETAILED DESCRIPTION

[0019] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0020] Refer to the attached Figure 1 The utility model is a water-cooled negative ion synergistic low-temperature plasma generating device, including a nozzle, the nozzle including a nozzle, the nozzle including a large diameter section 11, a reducing section 12, and a small diameter section 13 connected in sequence, the inner cavities of the large diameter section 11, the inner cavities of the reducing section 12, and the inner cavities of the small diameter section 13 are coaxial and connected in sequence to form a tube cavity 14 of the nozzle, and a discharge needle 7 is also provided. The discharge needle 7 extends from the large diameter section 11 to the reducing section 12, and the needle tip of the discharge needle 7 is located in the inner cavity of the reducing section 12. The large diameter section 11 is made of insulating material.

[0021] A perforation is provided on the large diameter section 11, and a valve 8 is provided in the perforation. The valve 8 is an electronic valve. The perforation is connected to a negative ion box 9 through a negative ion tube. A negative ion probe 10 is provided in the negative ion box 9. A negative ion generator 3 is provided outside the negative ion box 9, and the discharge end of the negative ion generator 3 is located in the negative ion cavity.

[0022] A circumferentially closed conical ring cavity 1 is provided in the tube wall of the reducing section 12 , and the conical ring cavity 1 is connected to the coolant tank 2 through a liquid inlet pipe 4 and a liquid outlet pipe 5 . The coolant tank 2 is also provided with a liquid replenishing port and a liquid pump connected to the liquid inlet pipe 4 .

[0023] A temperature control probe 6 and a buzzer module are provided in the small diameter section 13 . The temperature control probe 6 and the buzzer module, the liquid pump, the negative ion generator 3 , and the negative ion probe 10 are all electrically connected to the control console.

[0024] When the present invention is in use, the negative ion generator 3 is turned on to fill the negative ion chamber with negative ions. After the negative ion generator 3 has been running for a period of time, the plasma generator is placed above the water body, that is, the nozzle is placed at a certain distance above the water body. Negative ions are generated in the nozzle cavity 14 by the negative ion generator 3. The negative ions flow along the air source, thereby increasing the concentration of negative ions in the air source. The plasma generation principle is based on electron avalanche. The start and progress of electron avalanche require the participation of a large number of electrons or charged particles. The presence of electrons can reduce the corona voltage of the plasma, causing the voltage of the plasma to drop. The voltage drop means a lower temperature. The increase in negative ions reduces the voltage and thus achieves a cooling effect. At the same time, through the setting of the conical ring cavity 1, the coolant cools the variable diameter section of the discharge needle 7 to achieve the effect of passive cooling. The following four groups of cases were specifically carried out, among which Case 4 is this solution:

[0025] Case 1: The plasma generator is placed 1 cm above the water body, the water volume is 5 L, the power supply is 600 W, and the treatment time is 10 min.

[0026] Case 2: Turn on the negative ion generator to fill the negative ion chamber with negative ions. After the negative ion generator runs for 1 minute, the plasma generator is placed 1 cm above the water body. The water body capacity is 5 L, the power supply is 600 W, and the treatment time is 10 minutes.

[0027] Case 3: The plasma generator is placed 1 cm above the water body, the water body capacity is 5 L, the power supply is 600 W, and the treatment time is 10 min. At the same time, the coolant (1°C) is circulated in the cooling chamber, and the water pump flow rate is 1 L / min.

[0028] This plan: turn on the negative ion generator to fill the negative ion chamber with negative ions. After the negative ion generator runs for 1 minute, the plasma generator is placed 1 cm above the water body. The water body capacity is 5 L, the power supply is 600 W, and the treatment is carried out for 10 minutes. At the same time, the coolant (1°C) is circulated in the cooling chamber, and the water pump flow rate is 1 L / min.

[0029] Sterilization treatment:

[0030] The activated E. coli was placed in the activated water produced in Cases 1, 2, 3, and 4 to a final E. coli concentration of 10^6 CFU / mL. The total colony count was measured every 5 minutes for 30 minutes, and the D values of different plasma activated waters for E. coli were calculated.

[0031] Finally, the following data is obtained:

[0032] From the above data, it can be seen that this solution has the best effect on lowering the temperature.

[0033] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved through or by adopting existing technologies, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A water-cooled negative ion synergistic low-temperature plasma generator, comprising a nozzle, characterized in that: The nozzle is also provided with a through hole communicating with the nozzle lumen (14), and the through hole is connected to the negative ion generator (3).

2. The water-cooled negative ion synergistic low-temperature plasma generator according to claim 1, characterized in that: A circumferentially closed conical ring cavity (1) is provided in the wall of the nozzle reducing section (12), and the conical ring cavity (1) is connected to the coolant tank (2) via a liquid inlet pipe (4) and a liquid outlet pipe (5).

3. The water-cooled negative ion synergistic low-temperature plasma generator according to claim 1, characterized in that: A valve (8) is provided in the perforation.

4. The water-cooled negative ion synergistic low-temperature plasma generator according to claim 1, characterized in that: The perforation is connected to a negative ion cavity located in a negative ion box (9) through a negative ion tube. The discharge end of the negative ion generator (3) is located in the negative ion box (9). A negative ion probe (10) is also provided in the negative ion box (9).

5. The water-cooled negative ion synergistic low-temperature plasma generator according to claim 1 or 2, characterized in that: A temperature control probe (6) is provided in the small diameter section (13) of the nozzle.

6. The water-cooled negative ion synergistic low-temperature plasma generator according to claim 2, characterized in that: The coolant tank (2) is also provided with a liquid replenishing port and a liquid pump connected to the liquid inlet pipe (4).

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