KR101035343B1 - Ultraviolet rays sterilizer for fluid having poor ultraviolet rays transmission - Google Patents

Abstract

The ultraviolet fluid sterilizer according to the present invention is installed to surround the outside of the quartz tube 20 by being spaced apart from the quartz tube 20 and the spiral turbulent flow forming jaw 135 protrudes from the quartz tube 20 on the inner wall thereof. Spiral corrugated pipe 130 is formed to be; And a fluid pipe 40 installed to surround the outside of the spiral corrugated pipe 130 at a predetermined interval from the spiral corrugated pipe 130. It is provided with a fluid pipe 40, the cooling water flows between the fluid pipe 40 and the spiral corrugated pipe 130 to control the temperature of the sterilized fluid flowing between the spiral corrugated pipe 130 and the quartz pipe 20 It is characterized in that the cooling water inlet 165a and the cooling water outlet 165b for sending are provided. According to the present invention, since the flow of the fluid passing through the gap between the quartz tube 20 and the spiral corrugated tube 130 is not only thinned, but also the sterilized fluid is turbulent by the spiral turbulence forming jaw 135, the UV lamp ( As the irradiation efficiency of 10) is increased, the sterilization efficiency is excellent even for the fluid with low UV transmittance. In particular, the coolant can flow in the gap between the fluid pipe 40 and the spiral corrugated pipe 130, thereby preventing the ultraviolet lamp from being overheated by the sterilizing fluid having a high initial temperature, thereby preventing the sterilization efficiency from being lowered according to the temperature of the fluid. You can do it.

Ultraviolet Fluid Sterilization, Spiral Corrugated Pipe, Coolant, Spiral Turbulence Jaw, Thinning

Description

Ultraviolet rays sterilizer for fluid having poor ultraviolet rays transmission

The present invention relates to an ultraviolet fluid sterilizer, and more particularly to an ultraviolet fluid sterilizer suitable for sterilizing a fluid having a low ultraviolet transmittance.

Ultraviolet sterilization is a method of physical sterilization using light, which damages microbial chromosome information by the action of 254nm wavelength among ultraviolet wavelengths, thereby preventing microorganisms from growing and dividing and killing microorganisms.

UV sterilization has been used to sterilize microorganisms (or waterborne microorganisms) in a fluid. At this time, the fluid to be sterilized should have a transmittance of a certain level of ultraviolet rays because the wavelength of sterilized ultraviolet rays is very short as 254 nm, so that the permeability is remarkably decreased by being absorbed by turbidity or chromaticity.

Therefore, UV sterilization for fluids has been considered economical when the UV transmittance of the fluid is usually above 60% (or 40 ~ 45% in some foreign companies). It was common sense not to apply UV light.

For this reason, the sterilization of fluids with low UV transmittance was inevitably dependent on heat, and thus, side effects were caused by excessive energy expenditures and destruction of specific components in the fluid by high heat.

Ultraviolet transmittance refers to the intensity of ultraviolet rays measured after transmitting 254 nm of ultraviolet rays in a 1 cm quartz cell in%. The drinking water shows 98% or more, 80% of running water and 60-70% of sewage effluent.

Ultraviolet permeability is lowered when there is a component which absorbs ultraviolet rays in the fluid, for example, an inorganic substance such as iron or manganese, or a substance composed of a benzene structure such as pentose sugar and hexavalent sugar such as sugar syrup.

Fluids with low UV transmittance include green juice (kale, buttercup, pomegranate, carrot, etc.), fruit drink (orange, apple, pomegranate, etc.), sap (croquette sap, etc.), liquor (folk liquor, makgeolli, cider, etc.), various health Beverages, sauces and condiments (soy sauce, persimmon vinegar, fructose, etc.), lubricating oils, medicines, and other highly viscous ultraviolet impermeable liquids that require sterilization.

In particular, the green juice is a juice of a plant from pressing by the press of selected natural organic vegetable juice one after the bacterial counts of the normal 100,000 ~ 1,000,000 grains ^{(10 5 ~ 10 6 cfu /} mL) per mL is detected and during the shelf-life To prevent deterioration, most companies recommend that they be delivered to consumers within one day of refrigeration and eaten after opening. When the green juice is left at room temperature, it expands so that the container becomes convex in one day by the gas generated by microbial growth. Therefore, despite the urgent need for microbial sterilization is a problem because the sterilization through ultraviolet rays is not properly performed.

Therefore, the problem to be solved by the present invention, in order to overcome the limitations of ultraviolet sterilization and minimize the side effects caused by thermal sterilization, thin film thickness of the fluid flowing around the ultraviolet lamp so that the concept of permeation sterilization and surface sterilization of ultraviolet light is implemented at the same time It is to provide a UV fluid sterilizer that makes the UV film sterilization even for a fluid with a small UV transmittance by irradiating UV rays for a certain time by forming a thin film and turbulent flow of the fluid.

 Ultraviolet fluid sterilizer according to the present invention for achieving the above object is made, including an ultraviolet sterilization unit, the ultraviolet sterilization unit,

Quartz tube; An ultraviolet lamp installed in the quartz tube; Spiral corrugated pipe is installed to surround the outside of the quartz tube spaced apart from the quartz tube and the inner wall is formed to protrude so that the spiral turbulence forming jaw does not touch the quartz tube; And a fluid pipe installed to surround the outer side of the spiral corrugated pipe spaced apart from the spiral corrugated pipe by a predetermined distance. Equipped with

The fluid pipe is provided with a cooling water inlet and a cooling water outlet for flowing cooling water between the fluid pipe and the spiral corrugated pipe so as to control the temperature of the sterilized fluid flowing between the spiral corrugated pipe and the quartz tube. .

The spiral turbulence forming jaw is preferably formed to contact the inner wall of the spiral corrugated pipe at an obtuse angle. At this time, the spiral turbulence forming jaw is more preferably protrude in a curved form.

As the fluid tube, it is preferable to use a stainless steel, a fluorine-containing polymer material, or a high density polyethylene (HDPE).

As the ultraviolet lamp, it is preferable to use a rod lamp installed in parallel with the quartz tube.

The gap between the fluid tube and the quartz tube is 1 to 10 mm, the spiral turbulence forming jaw is projected by 10 to 90% of the gap between the fluid tube and the sarcophagus tube, and the pitch spacing between the turbulent forming jaw is 5 mm to 50 mm. Is preferably.

According to the present invention, not only the flow of fluid passing through the gap between the quartz tube and the spiral corrugated tube is thinned, but also the sterilization fluid is turbulent by the spiral turbulence forming jaw, so that the irradiation efficiency of the ultraviolet lamp is increased and the ultraviolet ray transmittance is low. Sterilization efficiency is also excellent for fluids. In particular, the cooling water can flow in the gap between the fluid pipe and the spiral corrugated pipe, thereby preventing the ultraviolet lamp from being overheated by the sterilizing fluid having a high initial temperature, thereby preventing the sterilization efficiency from being lowered according to the temperature of the fluid. Since the spiral turbulence forming jaws contact the spiral corrugated tube at an obtuse angle, foreign matter in the fluid can be prevented between them.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited to these embodiments.

Example 1

1 is an overall schematic diagram of an ultraviolet fluid sterilizer according to a first embodiment of the present invention. Referring to FIG. 1, the ultraviolet fluid sterilizer according to the first embodiment of the present invention is formed by connecting a plurality of ultraviolet sterilization units 50 in series or in parallel. The reason for connecting the ultraviolet sterilization unit 50 in series is to increase the sterilization efficiency, and the reason for connecting in parallel is to increase the sterilization throughput. In FIG. 1, only the case where the ultraviolet sterilization unit 50 is connected in series is shown. When connecting the UV sterilization unit 50 in series, it is good to connect in units of 2 to 5 in consideration of the differential pressure of the unit.

The fluid to be sterilized flows into the ultraviolet sterilization unit 50, and the flowing fluid is ultraviolet sterilized by ultraviolet rays irradiated inside the ultraviolet sterilization unit 50. The ultraviolet sterilization unit 50 is provided with an ultraviolet sensor 60 for detecting the quartz tube 20 cleaning state when the ultraviolet fluid sterilizer is stopped.

2 is a view for explaining the ultraviolet sterilization unit 50 of FIG. As shown in FIG. 2, the ultraviolet sterilization unit 50 according to the present invention includes a rod-shaped ultraviolet lamp 10, a quartz tube 20, a spring coil 30, and a fluid tube 40.

 The ultraviolet lamp 10 is installed in parallel with the quartz tube 20 at the inner center of the quartz tube 20. As shown in FIG. 4, the ultraviolet lamp 10 may increase the UV sterilization efficiency by installing a plurality of the battery cells side by side, and in this case, the ultraviolet lamp 10 may be arranged concentrically with respect to the inner center of the quartz tube 20.

The fluid tube 40 is installed to surround the quartz tube 20. The fluid tube 40 and the quartz tube 20 are arranged concentrically, and the fluid tube 40 has a diameter larger than that of the quartz tube 20 so that the gap d between the fluid tube 40 and the quartz tube 20 is d. ) Exists.

Fluid sterilization is achieved by irradiating the ultraviolet light through the ultraviolet lamp 10 to the fluid flowing through the gap (d). The smaller the gap d, the thinner the fluid flow and the better ultraviolet disinfection. However, in consideration of the efficiency of the device, the gap d is preferably about 1 to 10 mm depending on the fluid.

The material of the fluid tube 40 may be stainless steel or plastic that is chemically stable to the fluid. However, in the case of plastic, since it is easily hardened and powdered by the sterilizing ultraviolet wavelength (245 nm), general plastic materials except high-molecular materials containing fluorine (F) (eg Teflon, Viton) and high density polyethylene (HDPE) Can not use it.

In order for the fluid flowing in the gap d to be uniformly irradiated with ultraviolet light emitted from the ultraviolet lamp 10, the fluid is preferably turbulent to mix well. This turbulence also prevents small solid foreign matters that may be in the fluid from sticking to the surface of the quartz tube 20 to prevent ultraviolet rays from being blocked by the solid foreign matters, thereby degrading UV sterilization function. That is, it is preferable to prevent the ultraviolet sterilization function from dropping when the sterilizer is operated for a long time.

A spring coil 30 as a turbulent flow forming jaw for turbulent flow of the fluid flowing in the gap d is attached to the inner wall of the fluid pipe 40. The spring coil 30 should be smaller than the gap d between the fluid tube 40 and the quartz tube 20 so that the spring coil 30 does not come into contact with the quartz tube 20. When the spring coil 30 is installed to be attached to the quartz tube 20, not only the flow of fluid through the gap d is blocked, but also the ultraviolet rays emitted from the ultraviolet lamp 10 are blocked by the spring coil 30. There is a problem that the fluid flowing in the gap (d) is not properly irradiated. It is preferable that the diameter of the spring coil 30 is about 10 to 90% of the gap d.

3A and 3B illustrate the flow of fluid in the gap d. Specifically, the fluid flowing through the gap d between the fluid tube 40 and the quartz tube 20 has the components of a straight flow as shown in FIG. 3a and a spiral flow as shown in FIG. 3b.

Turbulent helical flow (FIG. 3B) causes the turbulent helical flow to collide with the linear flow (FIG. 3A), adding to the turbulence of the fluid flowing in the gap d. The turbulence of the helical flow (FIG. 3B) is preferably adjusted so that the Reynolds number is 4000 or more by adjusting the pitch spacing and fluid amount of the bar spring coil 30 affected by the pitch spacing of the spring coil 30. Do. If the pitch spacing of the spring coil 30 is too narrow, the spring coil 30 does not function as a fluid resistance, and if the pitch spacing is too wide, the generation of turbulence is rather hindered. Pitch spacing of the spring coil 30 is preferably 5mm ~ 50mm in consideration of the diameter (d) and the diameter of the spring coil 30 presented above.

The Reynolds number is defined as Equation 1 below and is defined as laminar flow if 2000 or less and turbulent flow if 4000 or more. According to Equation 1, when the flow rates are the same, the smaller the diameter of the tube, the lower the viscosity, and the lower the temperature (the higher the density), the higher the Reynolds number.

[Equation 1]

Reynolds number = density X flow rate X tube diameter / viscosity

FIG. 5 is a view for explaining a case of increasing ultraviolet sterilization efficiency by installing a plurality of quartz tubes 20 in FIG. 1. However, in this case, there is a disadvantage in that the work of making the shape of the fluid tube 40 into a shape other than a circle is required to minimize the gap between the fluid tube 40 and the quartz tube 20.

[Experimental Example 1: Connect 2 sterilization units in series using low pressure low power 75W lamp]

(1) 150L fluid passage per hour

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 78,000 Sterilization Unit 1 38,000 51.3 Sterilization Unit 2 26,000 66.7

(2) 100L fluid passage per hour

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 46,000 Sterilization Unit 1 20,000 56.7 Sterilization Unit 2 15,000 67.4

(3) 70L fluid passage per hour

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 49,000 Sterilization Unit 1 15,000 69.4 Sterilization Unit 2 12,000 75.5

In Experimental Example 1, even if two sterilization units are connected in series, the output of the ultraviolet lamp is weak, so the sterilization efficiency is increased as the fluid flow rate is slow, but the increase is insignificant, and the target level is 99% sterilization efficiency and microorganism per 1g of kale. It did not reach the 100 ~ 1,000 cfu level.

[Experimental Example 2: Connect 4 sterilization units in series using low pressure high power 190W amalgam lamp]

(1) 560L of fluid per hour

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 187,500 Sterilization Unit 1 140,500 25.1 Sterilization Unit 2 56,333 70.0 Sterilization Unit 3 14,100 92.5 Sterilization Unit 4 7.650 95.9

(2) 280L of fluid passage per hour

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 79,500 Sterilization Unit 1 33,800 57.5 Sterilization Unit 2 12,500 84.3 Sterilization Unit 3 2,670 96.6 Sterilization Unit 4 580 99.3

(3) 140L per hour through the fluid

Sampling position General bacteria (cfu / g kale) Sterilization Efficiency (%) Remarks Kale stock 89,000 Sterilization Unit 1 14,500 83.7 Sterilization Unit 2 2,120 97.6 Sterilization Unit 3 335 99.6 Sterilization Unit 4 700 99.2

In Experimental Example 2, although the flow rate of the fluid is faster than that of Experimental Example 1, since the sterilization units were connected twice in series with Experimental Example 4 and the output of the UV lamp was increased, the target level was 99% sterilization efficiency and per 1g of kale. The microorganism reached the level of 100-1,000 cfu.

However, there are some disadvantages in the case of the first embodiment described above. First, since the spring-type coil 30 is attached to the inner wall of the fluid tube 40 as a turbulence forming jaw, the point where the spring-type coil 30 and the fluid tube 40 contact each other is like a circle (spring coil) and a plane ( The inner wall of the fluid tube) meets the same shape, so that a narrow gap is formed between the spring coil 30 and the fluid tube 40. Therefore, a problem arises in that solids in the fluid are deposited in the narrow gap between the spring coil 30 and the fluid pipe 40. Second, ultraviolet sterilization may not be performed properly when the temperature of the fluid is high, but the first embodiment does not consider a method of controlling the temperature of the fluid.

[Example 2]

6 is an overall schematic view of an ultraviolet fluid sterilizer according to a second embodiment of the present invention, to compensate for the disadvantages of the first embodiment described above, and FIG. 7 is a view for explaining the ultraviolet sterilization unit 150 of FIG. to be.

6 and 7, the ultraviolet fluid sterilizer according to the second embodiment of the present invention has cooling water outlet inlets 165a and 165b. To this end, rather than attaching the spring-type coil 30 to the inner wall of the fluid tube 40 as in the first embodiment, the spiral corrugated pipe 130 having a spiral corrugation formed on the inner wall is formed inside the fluid tube 40. It is characterized by interpolation.

Specifically, the spiral corrugated pipe 130 is interposed between the quartz pipe 20 and the fluid pipe 40. The fluid tube 40 has a larger diameter than the helical corrugated tube 130, and the helical corrugated tube 130 has a larger diameter than the quartz tube 20 such that a gap d1 exists between the fluid tube 40 and the helical corrugated tube 130. The gap d exists between the corrugated pipe 130 and the quartz pipe 20.

The smaller the gap d between the spiral corrugated pipe 130 and the quartz tube 20 is, the thinner the fluid flow becomes, resulting in better ultraviolet sterilization. However, the gap d is preferably about 1 to 10 mm depending on the fluid in view of the efficiency of the device.

The gap d1 between the fluid pipe 40 and the spiral corrugated pipe 130 becomes the cooling water flow path 160. When the temperature of the sterilizing fluid flowing through the gap d between the quartz tube 20 and the spiral corrugated pipe 130 is a predetermined temperature, for example, 30 ° C. or more, the cooling water flows into the cooling water flow path 160 to adjust the sterilizing fluid to a desired temperature. . Cooling water is supplied to the cooling water flow path 160 through the cooling water inlet 165a and the cooling water outlet 165b formed in the fluid pipe 40.

If the temperature of the fluid to be sterilized is high, the temperature around the ultraviolet lamp 10 increases. The illuminance of the ultraviolet lamp 10 is affected by the temperature around it. When the temperature around the ultraviolet lamp 10 is high, the electron flow of the ultraviolet lamp 10 is disturbed. For example, when the temperature of the sterilizing fluid exceeds 30 ° C, the illuminance of the ultraviolet lamp 10 falls. Therefore, in order to maximize the sterilization efficiency of the ultraviolet lamp 10, such a cooling water flow path 160 is required. In the case of the first embodiment described above, such a problem cannot be solved.

On the inner wall of the spiral corrugated pipe 130, the spiral turbulence forming jaw 135 is formed to protrude by d2. The spiral turbulence forming jaw 135 should be installed to be separated from the quartz tube 20. Because when the spiral turbulence forming jaw 135 touches the quartz tube 20, not only the flow of the sterilization fluid through the gap d is blocked, but also the ultraviolet rays emitted from the ultraviolet lamp 10 are blocked by the spiral turbulence forming jaw 135. This is because the sterilizing fluid flowing through the gap d is not properly irradiated.

When the spiral turbulent flow forming jaw 135 is installed to approach the quartz tube 20 too much, when the solids in the sterilized fluid are accumulated while being caught by the spiral turbulent flow forming jaw 135, the area of ultraviolet rays irradiated onto the sterilized fluid gradually decreases. In addition, since the flow of the fluid is blocked later, it is desirable to maintain an appropriate gap d-d2 between the spiral turbulence forming jaw 135 and the quartz tube 20 to maintain the sterilization duration.

The spiral turbulence forming jaw 135 is preferably in contact with the inner wall of the spiral corrugated pipe 130 to form an obtuse angle (> 90 °), it is preferable to project in a curved shape. This is because when the acute angle (<90 °) is achieved, solids in the fluid may be deposited at a point where the spiral turbulence forming jaw 135 and the spiral corrugated pipe 130 contact each other. In the case of attaching the spring coil 30 to the inner wall of the fluid pipe 40 as in the first embodiment, this problem cannot be solved because the spring coil 30 and the fluid pipe 40 contact at an acute angle. .

If the pitch spacing of the spiral turbulent flow forming jaw 135 is too narrow, the spiral turbulent flow forming jaw 135 does not function as a fluid resistance, and if the pitch interval is too wide, the occurrence of turbulence is rather hindered. It is also preferable that the pitch spacing is 5 mm to 50 mm as in the spring coil 30 described above.

As described above, according to the second embodiment of the present invention, it is possible to solve the cooling problem and the locking problem of the solids, which are not solved by the first embodiment.

1 is an overall schematic diagram of an ultraviolet fluid sterilizer according to a first embodiment of the present invention;

2 is a view for explaining the ultraviolet sterilization unit 50 of FIG.

3A and 3B illustrate fluid flow in the gap d of FIG. 2;

FIG. 4 is a view for explaining a case where a plurality of ultraviolet lamps 10 of FIG. 1 are installed;

5 is a view for explaining a case where a plurality of quartz tubes 20 of FIG. 1 are installed;

6 is an overall schematic view of an ultraviolet fluid sterilizer in accordance with a second embodiment of the present invention;

7 is a view for explaining the ultraviolet sterilization unit 150 of FIG.

<Description of reference numbers for the main parts of the drawings>

10: ultraviolet lamp 20: quartz tube

30: spring coil 40: fluid pipe

50, 150: UV sterilization unit 60: UV sensor

165a, 165b: cooling water outlet 160: cooling water flow path

130: spiral corrugated pipe 135: spiral turbulent forming jaw

Claims (6)

Including UV sterilization unit, The ultraviolet sterilization unit, Quartz tube; An ultraviolet lamp installed in the quartz tube; Spiral corrugated pipe is installed to surround the outside of the quartz tube spaced apart from the quartz tube and the inner wall is formed to protrude so that the spiral turbulence forming jaw does not touch the quartz tube; And A fluid pipe installed to surround the outer side of the spiral corrugated pipe spaced apart from the spiral corrugated pipe by a predetermined distance; Equipped with The fluid pipe is provided with a cooling water inlet and a cooling water outlet for flowing the cooling water between the fluid pipe and the spiral corrugated pipe so as to control the temperature of the sterilized fluid flowing between the spiral corrugated pipe and the quartz tube. UV fluid sterilizer. The fluid sterilizer of claim 1, wherein the spiral turbulence forming jaw is formed to be in contact with an inner wall of the spiral corrugated pipe at an obtuse angle. The fluid sterilizer of claim 2, wherein the spiral turbulent flow forming jaw protrudes in a curved shape. The ultraviolet fluid sterilizer of claim 1, wherein the fluid tube is made of stainless steel, a high molecular material containing fluorine, or high density polyethylene (HDPE). The ultraviolet fluid sterilizer according to claim 1, wherein the ultraviolet lamp is a rod lamp installed in parallel with the quartz tube. According to claim 1, wherein the gap between the fluid tube and the quartz tube is 1 ~ 10mm, the spiral turbulence forming jaw is projected by 10 to 90% of the gap between the fluid tube and the sarcophagus tube, Ultraviolet fluid sterilizer, characterized in that the pitch interval is 5mm ~ 50mm.

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