Device for measuring biological validation dose of UV LEDs for liquid disinfection

Abstract

The present application is applicable to the technical field of liquid disinfection, and provides a device for measuring the biological verification dose of ultraviolet light emitting diodes for liquid disinfection, comprising: a container for containing a liquid containing a chemical exposure agent and for containing a water sample containing bacteria; an ultraviolet light emitting diode, arranged on one side of the container, to irradiate the chemical exposure agent located in the container and the water sample containing bacteria located in the container at the same position; a circuit board, connected to the ultraviolet light emitting diode; a heat conductor, abutting against the circuit board; the heat conductor is provided with a receiving cavity, and the receiving cavity is used to receive a cooling liquid. The device for measuring the biological verification dose of ultraviolet light emitting diodes for liquid disinfection provided in the embodiments of the present application can accurately measure the biological verification dose of ultraviolet light emitting diodes.

Description

Technical Field

[0001] The present application belongs to the technical field of liquid disinfection, and more specifically, to a device for measuring the biological verification dosage of an ultraviolet light emitting diode for liquid disinfection. Background Art

[0002] In the field of ultraviolet liquid disinfection, ultraviolet quasi-parallel light devices are usually used to measure biological verification doses, that is, by adding test microorganisms (bacteria) to the ultraviolet disinfection system, and measuring the inactivation rate of the test microorganisms, the dose of the ultraviolet system is inferred. The quasi-parallel light device is a device that obtains a radiation field with a known radiation intensity. The light source of the device is a long-line ultraviolet mercury lamp. Ultraviolet mercury lamps generate heat during operation. The entire device mainly relies on natural heat dissipation, and the heat dissipation effect is poor. Utility Model Content

[0003] The embodiments of the present application provide a device for measuring the biological verification dose of an ultraviolet light emitting diode for liquid disinfection, which can accurately measure the biological verification dose of the ultraviolet light emitting diode.

[0004] A device for measuring biological verification dosage of ultraviolet light emitting diodes for liquid disinfection, comprising:

[0005] Containers for holding liquids containing chemical exposure agents and for holding water samples containing bacteria;

[0006] an ultraviolet light emitting diode disposed on one side of the container to illuminate the chemical exposure agent located in the container and the water sample containing bacteria located in the container at the same position;

[0007] A circuit board connected to the ultraviolet light emitting diode;

[0008] A heat conductor abuts against the circuit board;

[0009] The heat conductor is provided with a receiving cavity, and the receiving cavity is used to receive cooling liquid.

[0010] In some possible implementations, along the height direction of the device, the ultraviolet light emitting diode is located above the container and is fixed in position, the circuit board is arranged on the upper surface of the ultraviolet light emitting diode, and the heat conductor is arranged on the upper surface of the circuit board.

[0011] In some possible implementations, the device further includes:

[0012] A power line is connected to the circuit board.

[0013] In some possible implementations, the container is provided with an opening, and the light emitting surface of the ultraviolet light emitting diode faces the opening.

[0014] In some possible implementations, the device further includes:

[0015] A stirring device is used to stir the liquid in the container.

[0016] In some possible implementations, the stirring device includes:

[0017] A stirring bar, located in the inner cavity of the container;

[0018] A stirrer is used to drive the stirrer to move.

[0019] In some possible implementations, the number of the ultraviolet light emitting diodes is one or more.

[0020] In some possible implementations, along the height direction of the device, the ultraviolet light emitting diode is located above the horizontal liquid surface of the container.

[0021] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0022] Since both the chemical exposure agent and the water sample containing bacteria are present in the container in the form of liquid, the ultraviolet light emitting diode is used to emit ultraviolet light at the same position to irradiate the aforementioned liquid, so that the liquid containing the chemical exposure agent and the liquid containing the water sample containing bacteria can be irradiated under the same conditions, and the biological verification dose of the ultraviolet light emitting diode can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 A schematic diagram of the structure of a device for measuring the biological verification dose of an ultraviolet light emitting diode for liquid disinfection provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0027] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] It should be understood that the term “and / or” used in the specification and appended claims of this application refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The embodiment of the present application provides a device for measuring the biological verification dose of an ultraviolet light emitting diode for liquid disinfection, which is used to measure the biological verification dose using an ultraviolet light emitting diode as an ultraviolet light source.

[0031] Figure 1 A schematic diagram of a device for measuring the biological verification dose of an ultraviolet light emitting diode for liquid disinfection provided in an embodiment of the present application. Figure 1 The embodiment of the present application provides a device for measuring the biological verification dosage of an ultraviolet light emitting diode for liquid disinfection, which includes a container 1 and an ultraviolet light emitting diode 2.

[0032] The container 1 is used for containing liquid, specifically for containing liquid containing chemical exposure agent and for containing water sample containing bacteria.

[0033] Chemical actinometer can be KI / KIO 3 , KI / KIO 3 0.6 mol KI, 0.1 mol KIO 3 and 0.01 mol Na 2 B4 O 7 _10H 2 O composition.

[0034] A water sample containing bacteria is a liquid containing selected bacteria.

[0035] The liquid containing the chemical exposure agent can be an aqueous solution, that is, a solution formed by dissolving the chemical exposure agent in water. The water sample containing bacteria is a liquid to be disinfected, and specifically can be a body of water.

[0036] refer to Figure 1 , the container 1 may be a hollow structure with an opening 11 . The liquid enters the inner cavity 10 of the container 1 from the opening 11 .

[0037] The container 1 can specifically be a glass container or a quartz container.

[0038] The single ultraviolet light emitting diode 2 is an ultraviolet light emitting diode (UV-LED), which is a point light source and has the characteristics of being mercury-free and having a variety of wavelengths, and is an expected ultraviolet light source.

[0039] The number of the ultraviolet light emitting diodes 2 can be one or more. When the number of the ultraviolet light emitting diode 2 is one, the light source used by the device provided in the embodiment of the present application is approximately a point light source.

[0040] refer to Figure 1 The UV LED 2 is disposed on one side (such as the upper side) of the container 1 to illuminate the chemical exposure agent in the container 1 and the water sample containing bacteria in the container 1 at the same position. For example, the light emitting surface 21 of the UV LED 2 faces the opening 11 of the container 1, and emits ultraviolet light at a fixed position to illuminate the liquid in the container 1.

[0041] The measurement principle of the device provided in the embodiments of the present application is described below.

[0042] A liquid containing a chemical exposure agent is placed in a container 1, and the liquid is irradiated at a fixed position by an ultraviolet light emitting diode 2 for a specified time. After the specified time, the absorbance change of the liquid containing the chemical exposure agent at 352 nm before and after being irradiated by the ultraviolet light emitting diode 2 is measured. The energy of the ultraviolet photons absorbed by the liquid can be obtained according to formula (1). Combined with the irradiation time, the ultraviolet output of the ultraviolet light emitting diode 2 can be calculated.

[0043]

[0044] In formula (1): E is the total photon energy, in mJ; A 352is the absorbance change of the chemical exposure agent at 352nm and 1cm path length before and after ultraviolet irradiation; V is the effective volume of the solution (liquid), in mL; U 253.7 is the photon energy with a wavelength of 253.7 nm, in J·mol -1 ; R is the reflection coefficient when light enters water; c is the speed of light; h is Planck's constant.

[0045]

[0046] Since the UV LED is a point light source, the reflection coefficient R needs to be calculated using the following formula to calculate the total reflection coefficient R Total .

[0047]

[0048] In formula (3): R i 、E i are the reflection coefficient and radiant illuminance values ​​corresponding to different incident rays. Since different radiation models calculate different radiant energies for the same ray, the reflection coefficient R Total The value of is affected by the radiation pattern of each UV LED.

[0049] After obtaining the ultraviolet output of the ultraviolet light emitting diode 2, a water sample containing bacteria (i.e., liquid to be disinfected) is placed in the container 1, and the ultraviolet light emitting diode 2 is used to irradiate the liquid to be disinfected at a fixed position for a specified time (the same time as the time for irradiating the liquid containing the chemical exposure agent). The change in bacterial concentration before and after the same irradiation time is measured.

[0050] Repeat the above content to obtain the standard curve of "bacterial concentration change-received ultraviolet energy".

[0051] After obtaining the above standard curve, the sample to be measured (i.e. the liquid to be disinfected) is placed in the container 1, and the ultraviolet light emitting diode 2 irradiates the sample to be measured for a certain period of time, and then the change in bacterial concentration before and after irradiation is measured. According to the change in bacterial concentration, the corresponding ultraviolet energy can be found on the standard curve.

[0052] According to the above content, since both the chemical exposure agent and the bacteria are present in the container 1 in the form of liquid, the ultraviolet light emitting diode 2 is used to emit ultraviolet light at the same position to irradiate the aforementioned liquid, so that the liquid containing the chemical exposure agent and the liquid containing the bacteria are irradiated under the same conditions, and only the number of photons entering the liquid is considered, and there is no need to worry about whether all the photons from the ultraviolet light emitting diode 2 enter the liquid, that is, only part of the photons enter the liquid, which does not affect the measurement accuracy, and the biological verification dose of the ultraviolet light emitting diode can be accurately measured.

[0053] refer to Figure 1The above device may further include a circuit board 3.

[0054] The circuit board 3 is connected to the ultraviolet light emitting diode 2 to drive the ultraviolet light emitting diode 2 .

[0055] refer to Figure 1 The above device may further include a power cord 9.

[0056] The power line 9 is connected to the circuit board 3 to connect power to the circuit board 3 .

[0057] refer to Figure 1 The above device may further include a heat conductor 4.

[0058] The heat conductor 4 is used for heat conduction and can be made of glass or metal.

[0059] The ultraviolet light emitting diode 2 and the circuit board 3 will generate heat during operation; since the ultraviolet light emitting diode 2 is disposed on the circuit board 3, the heat generated by the ultraviolet light emitting diode 2 will be transferred to the circuit board 3. The heat conductor 4 is against the circuit board 3, can conduct heat to the circuit board 3, can take away the heat of the circuit board 3, and can make the ultraviolet light emitting diode 2 work stably for a long time.

[0060] refer to Figure 1 The heat conductor 4 may be provided with a receiving cavity 40 .

[0061] The accommodating cavity 40 of the heat conductor 4 is used to accommodate a cooling liquid, which may be pure water or a liquid containing ethylene glycol.

[0062] The coolant in the accommodating cavity 40 can take away the heat of the heat conductor 4 to achieve heat dissipation, which can make the ultraviolet light emitting diode 2 constant temperature, and has a simple structure, is easy to implement, and can reduce costs.

[0063] In some embodiments, along the height direction H of the device for measuring the biological verification dose of the ultraviolet light emitting diode for liquid disinfection, the ultraviolet light emitting diode 2 is located above the container 1, the circuit board 3 is arranged on the upper surface of the ultraviolet light emitting diode 2, and the heat conductor 4 is arranged on the upper surface of the circuit board 3, so that the overall structure can be compact.

[0064] In some embodiments, along the height direction H of the device, the UV LED 2 is located above the horizontal liquid level of the container 1; that is, during the measurement process, the liquid level of the container 1 is in a natural horizontal state, and the UV LED 2 emits ultraviolet light at a fixed position to irradiate the liquid in the container 1. The photons from the UV LED 2 naturally enter the liquid, and there is no need to require all photons to enter the liquid, which can make the measurement process relatively simple and improve the measurement speed.

[0065] refer to Figure 1 The above device may further include a stirring device 5.

[0066] The stirring device 5 is used to stir the liquid in the container 1 so that the liquid in the container 1 is evenly mixed, which can further improve the accuracy of the measurement.

[0067] refer to Figure 1 The stirring device 5 may include a stirrer 51 and a stirrer 52 .

[0068] The stirring bar 51 is located in the inner cavity of the container 1 .

[0069] The stirrer 52 is used to drive the stirrer 51 to move, so that the stirrer 51 stirs the liquid in the container 1 .

[0070] The stirrer 52 can specifically drive the stirrer 51 through magnetic force. For example, the stirrer 51 has a magnetic structure, and the stirrer 52 can generate a changing magnetic field. In this way, the stirrer 52 can drive the stirrer 51 to rotate in the inner cavity of the container 1.

[0071] The stirring device 5 may also be a mechanism that can rotate the container 1. The stirring device 5 drives the container 1 to rotate, so that the liquid in the container 1 is evenly mixed.

[0072] The embodiment of the present application provides a device for measuring the biological verification dose of an ultraviolet light-emitting diode for liquid disinfection. Both the chemical exposure agent and the biological verification agent are present in the form of liquid in a container 1 (or the chemical exposure agent and the liquid to be disinfected are both liquids). The ultraviolet light-emitting diode 2 is used to irradiate the aforementioned liquid under the same conditions, so that the measured biological verification dose has almost no geometric optical error. For example, the liquid containing the chemical exposure agent and the liquid containing bacteria have the same reflection, and no special calculation and correction are required. The embodiment of the present application provides a device for measuring the biological verification dose of an ultraviolet light-emitting diode for liquid disinfection. The device can improve the accuracy of measurement, can use a point light source and light of different wavelengths to achieve measurement, has a simple structure, is easy to implement, and has a low cost.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A device for measuring the biological verification dose of ultraviolet light emitting diodes for liquid disinfection, characterized in that, include: Containers for holding liquids containing chemical exposure agents and for holding water samples containing bacteria; an ultraviolet light emitting diode disposed on one side of the container to illuminate the chemical exposure agent located in the container and the water sample containing bacteria located in the container at the same position; A circuit board connected to the ultraviolet light emitting diode; A heat conductor abuts against the circuit board; The heat conductor is provided with a receiving cavity, and the receiving cavity is used to receive cooling liquid.

2. The device according to claim 1, characterized in that Along the height direction of the device, the ultraviolet light emitting diode is located above the container and is fixed in position, the circuit board is arranged on the upper surface of the ultraviolet light emitting diode, and the heat conductor is arranged on the upper surface of the circuit board.

3. The device according to claim 1, characterized in that The device also includes: A power line is connected to the circuit board.

4. The device according to claim 1, characterized in that The container is provided with an opening, and the light emitting surface of the ultraviolet light emitting diode faces the opening.

5. The device according to claim 1, characterized in that The device also includes: A stirring device is used to stir the liquid in the container.

6. The device according to claim 5, characterized in that The stirring device comprises: A stirring bar, located in the inner cavity of the container; A stirrer is used to drive the stirrer to move.

7. The device according to any one of claims 1 to 6, characterized in that The number of the ultraviolet light emitting diodes is one or more; Along the height direction of the device, the ultraviolet light emitting diode is located above the horizontal liquid surface of the container.

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