Fogging devices and fogging methods

Abstract

The present invention relates to a fogging device and a fogging method. They mainly include: an evaporator, the evaporator is used to generate steam, a temperature difference controller, the temperature difference controller is connected to the evaporator, the temperature difference controller is used to mix the steam generated by the evaporator with a carrier gas to form a mixed gas, and adjust the temperature of the mixed gas to a certain range, and a flow rate distribution regulator, the flow rate distribution regulator is connected to the temperature difference controller, and the flow rate distribution regulator is used to adjust the flow rate and flow rate distribution of the mixed gas formed by the temperature difference controller. The present invention can evenly cover the entire width of the processed sample with a layer of fog, and the fog particles can be nanometer-level. The fogging is continuous and uniform, and the fogging amount is continuously adjustable.

Description

Technical Field

[0001] The invention relates to a fogging device, in particular to a fogging device and a fogging method used in the field of visual surface detection. Background Art

[0002] There is a transparent conductive film on the surface of the mobile phone screen. If the coating has defects, it will seriously affect the user's touch experience. However, because the film is very thin (tens of nanometers) and transparent, it is difficult to observe directly through the visual system. At present, a very effective method can increase the optical difference between the defects on the film and the base glass, which makes it easier to detect defects. This method is to evenly cover the glass surface with a layer of fog. In this way, the defects can be clearly observed through the optical camera. Since defects may appear at any position of the mobile phone glass, in order to speed up the detection speed, it is necessary to produce a very uniform fog layer on a larger format.

[0003] In addition, there are many other ultra-thin coating defect inspections that require the use of the surface fog layer.

[0004] At present, the industry has conducted a lot of exploration in the field of surface fogging devices. There are mainly the following methods for fogging:

[0005] (1) Mechanical spray method. The principle is to use high-speed airflow to crush a specified flow of water to form an aerosol-like spray, which is then sprayed onto the surface to form mist. The advantage is that the amount of mist can be accurately determined and the misting process is continuous. However, the particle size of this mist is relatively large and the distribution is not very uniform, making it difficult to support high-resolution defect inspection.

[0006] (2) Boiling bubbling method. The principle is to heat water to boiling to generate steam, then use air to carry the steam and spray it onto the screen surface, where it condenses to form fog. This method is characterized by continuous fogging and low device cost. However, the amount of fogging is unstable and cannot be accurately adjusted.

[0007] (3) Droplet explosion fogging. This method is similar to inkjet printing, that is, pulse heating of the droplets allows them to vaporize quickly and spray onto the surface to form fog. The advantage of this method is that it is relatively easy to draw the fog pattern and the spray volume can be controlled by the liquid speed. However, its disadvantage is that it is difficult to continuously cover a large area at a fast speed. Summary of the invention

[0008] Based on this, a fogging device is provided, which can generate fog in a large area with high uniformity, the amount of fogging can be continuously adjusted, and the fogging is nano-scale droplet particles.

[0009] A misting device, comprising:

[0010] an evaporator for generating steam,

[0011] A temperature difference controller is connected to the evaporator, and is used to mix the steam generated by the evaporator with the carrier gas to form a mixed gas, and adjust the temperature of the mixed gas to a certain range.

[0012] A flow rate distribution regulator, wherein the flow rate distribution regulator is connected to the temperature difference regulator, and the flow rate distribution regulator is used to adjust the flow rate and flow rate distribution of the mixed gas formed by the temperature difference regulator.

[0013] The device of the present invention adopts three-layer control. The first layer of control is to use a continuous stable evaporator to completely convert a fixed quantity of water into steam. The second layer of control is to evenly mix the carrier gas and water vapor in proportion in the chamber of the temperature difference controller, and adjust to the required temperature difference and mixing ratio with the fogging surface. The third layer of control is to balance the speed of each point of the outlet airflow in the flow velocity distribution regulator to achieve uniform linear laminar flow. In this way, a jet will be formed at the outlet of the flow velocity distribution regulator, and the treated sample (such as mobile phone glass) will move at a uniform speed under the jet, and a layer of fog can be evenly covered on the entire width of the treated sample. Under the synergistic effect of the various layers of control of the present invention, the fog particles can be nanometer-level. And the flow rate adjustment of the evaporator can achieve continuous and adjustable fogging amount.

[0014] In one embodiment, the evaporator is a microchannel evaporator.

[0015] In one embodiment, the water inlet of the evaporator is connected to a first metering pump.

[0016] In one embodiment, the temperature difference controller includes a first air inlet and a second air inlet, the first air inlet is connected to the steam outlet of the evaporator, and the second air inlet is connected to a second metering pump.

[0017] In one embodiment, the first air inlet and the second air inlet are arranged vertically.

[0018] In one embodiment, the flow velocity distribution regulator includes a first rectifying slit, a flow velocity distribution regulating mechanism and a second rectifying slit arranged in sequence, and the mixed gas passes through the first rectifying slit, the flow velocity distribution regulating mechanism and the second rectifying slit in sequence, and the flow velocity distribution regulating mechanism includes two trapezoidal movable regulating plates and a regulating plate control assembly for controlling the movement of the two regulating plates.

[0019] A misting method comprises mixing steam and a carrier gas to form a mixed gas, wherein the volume ratio of the steam to the carrier gas is 5:1-9:1, adjusting the temperature of the mixed gas so that the temperature difference between the mixed gas and the carrier gas is adjusted to 50°C-90°C, and adjusting the flow rate and flow rate distribution of the mixed gas.

[0020] In one embodiment, the flow rate and flow rate distribution of the mixed gas are adjusted as follows:

[0021] First, adjust the flow rate of the mixed gas to 0.3m / s-1.0m / s, then adjust the flow rate distribution of the mixed gas, and finally adjust the flow rate of the mixed gas to 7m / s-12m / s. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of a misting device according to an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of a misting device according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of a flow rate distribution regulator on a misting device according to an embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of the arrangement of two trapezoidal sheets of the flow velocity distribution regulator according to an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the first rectifying slit of the flow velocity distribution regulator according to an embodiment of the present invention.

[0027] Figure 6 It is a schematic diagram of a fogging device according to an embodiment of the present invention uniformly covering a fog layer on a screen.

[0028] in:

[0029] 110, evaporator 120, temperature difference controller 130, flow rate distribution regulator

[0030] 200, processed sample 310, first metering pump 320, second metering pump

[0031] 131, first rectifying slit 132, flow rate distribution adjustment mechanism 133, second rectifying slit

[0032] 132a, Adjustment sheet DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a fogging device, the device comprising:

[0037] The evaporator 110 is used to generate steam.

[0038] The temperature difference controller 120 is connected to the evaporator 110. Specifically, a steam inlet is provided on the temperature difference controller 120, and the steam inlet is connected to the steam outlet on the evaporator 110. At the same time, a carrier gas inlet is provided on the temperature difference controller 120 for inputting the carrier gas. The temperature difference controller 120 is used to mix the steam generated by the evaporator 110 with the carrier gas to form a mixed gas, and adjust the temperature of the mixed gas to a certain range.

[0039] The flow velocity distribution regulator 130 is connected to the temperature difference regulator 120. Specifically, the flow velocity distribution regulator 130 can be arranged at the mixed gas outlet of the temperature difference regulator 120. The flow velocity distribution regulator 130 is used to adjust the flow velocity and flow velocity distribution of the mixed gas formed by the temperature difference regulator 120. The flow velocity distribution refers to the distribution of the flow velocity direction and size at each point on a certain section.

[0040] It should be noted that the carrier gas may be air or other types of gas. The carrier gas is used to mix with the steam and then flow to the flow rate distribution regulator 130 .

[0041] The device of the present invention adopts three-layer control. The first layer of control is to use a continuous stable evaporator 110 to completely convert a quantitative and constant speed of water into steam. Here, the quantitative and constant speed water supply to the evaporator can be achieved by a device such as a metering pump. The second layer of control is that in the chamber of the temperature difference controller 120, the carrier gas and water vapor are evenly mixed in proportion and adjusted to have the required temperature difference and mixing ratio with the fogging surface. Among them, the carrier gas can be quantitatively supplied by a metering pump, a gas flow meter and other devices, and the water vapor can be quantitatively supplied by a metering pump and other devices. The third layer of control is that in the flow velocity distribution regulator 130, the speed of each point of the outlet airflow is balanced to achieve a uniform linear laminar flow. In this way, a jet will be formed at the outlet of the flow velocity distribution regulator 130, and the treated sample 200 (such as mobile phone glass) moves at a uniform speed under the jet, and a layer of fog can be evenly covered on the entire width of the treated sample 200, and the particles of the fog can be nanometers.

[0042] In this embodiment, the evaporator 110 is preferably a continuous stable evaporator 110, which is required to be able to continuously evaporate the water of the specified flow rate, and the flow fluctuation of the obtained steam does not exceed ±10%. The continuous stable evaporator 110 can be an evaporator 110 commonly used in the prior art, such as a microchannel evaporator 110, and the capillary evaporation channel of this evaporator 110 is 0.1mm-1.0mm. It can be understood that other types of evaporators 110 can also be used as long as they meet the above requirements.

[0043] Specifically, when the evaporator 110 is in use, its water inlet is connected to the first metering pump 310. The first metering pump 310 is connected to a water source. Water is fed into the evaporator 110 through the first metering pump 310. At the same time, the first metering pump 310 can also control the flow of steam.

[0044] In this embodiment, the temperature difference controller 120 includes a first air inlet and a second air inlet, wherein the first air inlet is connected to the steam outlet of the evaporator 110, and the second air inlet is connected to the second metering pump 320. The carrier gas is transported into the temperature difference controller 120 through the second metering pump 320, so that the carrier gas and the steam are mixed in the temperature difference controller 120. When the carrier gas is air, the second metering pump 320 transports the air into the temperature difference controller 120.

[0045] The above-mentioned temperature difference controller 120 can apply existing devices for adjusting temperature. For example, the temperature difference controller 120 may include a cavity, and the interior of the cavity is used to mix steam and carrier gas. A heating belt may be wound around the cavity, and a temperature sensor is also arranged in the cavity, and the temperature sensor and the heating belt may be connected to a temperature controller. The temperature controller may apply existing instruments, for example, a temperature control instrument with a PID closed-loop temperature control. The temperature sensor is used to detect the temperature inside the cavity and send the data to the temperature controller, and the temperature controller adjusts the heating value of the heating belt according to the data, thereby controlling the temperature in the cavity. It can be understood that the above-mentioned temperature difference controller 120 may also be a module in which the cavity and the electric heating tube are connected into an integral whole by cast aluminum, a temperature sensor is arranged in the cavity, and the temperature sensor and the electric heating tube are connected to the temperature controller.

[0046] Furthermore, the present invention has experimentally proved that the ratio of steam to carrier gas and the temperature difference between the mixed gas and the treated surface are crucial to the particle size distribution of the mist droplets. Here, the particle size distribution refers to the number of particles of different particle sizes.

[0047] Experiments have shown that the ratio of steam to carrier gas is between 5:1-9:1 for best results. For example, the ratio of steam to carrier gas is 5:1, 6:1, 7:1, 8:1, 9:1. At the same time, the temperature difference between the mixed gas and the carrier gas is 50℃-90℃ for best results.

[0048] In this embodiment, the first air inlet and the second air inlet are arranged vertically, so that the steam and the carrier gas are vertically mixed in the cavity of the temperature difference controller 120. This arrangement is conducive to gas mixing.

[0049] In this embodiment, the flow velocity distribution regulator 130 includes a first rectifying slit 131, a flow velocity distribution regulating mechanism 132, and a second rectifying slit 133 arranged in sequence, and the mixed gas passes through the first rectifying slit 131, the flow velocity distribution regulating mechanism 132, and the second rectifying slit 133 in sequence, and the flow velocity distribution regulating mechanism includes two trapezoidal movable regulating pieces and a regulating piece control component. The flow velocity distribution regulating mechanism includes two trapezoidal movable regulating pieces 132a and a regulating piece control component for controlling the movement of the two regulating pieces 132a. The regulating piece control component can be a screw. The two regulating pieces 132a are connected together by screws, for example, the ends of the two regulating pieces 132a are connected together by screws. The two regulating pieces 132a can rotate around the screw at a certain angle. The size of the gap between the two regulating pieces 132a can be adjusted by the rotation of the regulating piece 132a. Thus, the flow velocity distribution regulation can be achieved.

[0050] Specifically, Figures 3 to 5As shown, the first rectifying slit 131 can be a slit opened on a plate body. For example, the first rectifying slit 131 is a square slit with a width of 6mm-10mm, which can increase the flow rate of the mixed gas to about 0.3m / s-1.0m / s. The flow velocity distribution adjustment mechanism 132 is two movable trapezoidal sheets 132a, the hypotenuses of the two trapezoidal sheets 132a are arranged opposite to each other, and there is a slit between the two trapezoidal sheets 132a. By adjusting the relative positions of the two trapezoidal sheets 132a, the slit opening can be adjusted, and then the velocity distribution can be adjusted. The second rectifying slit 133 can be a slit opened on a plate body. For example, the second rectifying slit 133 is a square slit with a width of 0.2mm-0.3mm, which further increases the flow rate of the mixed gas to 7m / s-12m / s.

[0051] Through the above analysis, it can be seen that the present invention has the following beneficial effects:

[0052] (1) Continuous and uniform fogging;

[0053] (2) The amount of fogging is continuously adjustable;

[0054] (3) The mist droplets are small;

[0055] (4) It is convenient to achieve rapid fogging of large areas.

[0056] An embodiment of the present invention also provides a misting method, mixing steam and a carrier gas to form a mixed gas, wherein the volume ratio of steam to carrier gas is 5:1-9:1, the temperature of the mixed gas is adjusted so that the temperature difference between the mixed gas and the carrier gas is adjusted to 50°C-90°C, and the flow rate and flow rate distribution of the mixed gas are adjusted.

[0057] In one embodiment, the flow rate and flow rate distribution of the mixed gas are adjusted as follows:

[0058] First, adjust the flow rate of the mixed gas to 0.3m / s-1.0m / s, then adjust the flow rate distribution of the mixed gas, and finally adjust the flow rate of the mixed gas to 7m / s-12m / s.

[0059] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A misting device, characterized in that: include: an evaporator for generating steam, A temperature difference controller is connected to the evaporator, and is used to mix the steam generated by the evaporator with the carrier gas to form a mixed gas, and adjust the temperature of the mixed gas to a certain range. A flow rate distribution regulator, the flow rate distribution regulator is connected to the temperature difference regulator, and the flow rate distribution regulator is used to adjust the flow rate and flow rate distribution of the mixed gas formed by the temperature difference regulator; The flow velocity distribution regulator comprises a first rectifying slit, a flow velocity distribution regulating mechanism and a second rectifying slit which are arranged in sequence, the mixed gas passes through the first rectifying slit, the flow velocity distribution regulating mechanism and the second rectifying slit in sequence, the flow velocity distribution regulating mechanism comprises two trapezoidal movable regulating plates and a regulating plate control assembly for controlling the movement of the two regulating plates, The steam and the carrier gas are mixed to form a mixed gas, wherein the volume ratio of the steam to the carrier gas is 5:1-9:1, and the temperature of the mixed gas is adjusted so that the temperature difference between the mixed gas and the carrier gas is adjusted to 50°C-90°C. Adjust the flow rate and flow rate distribution of the mixed gas. First, adjust the flow rate of the mixed gas to 0.3 m / s -1.0 m / s, then adjust the flow rate distribution of the mixed gas, and finally adjust the flow rate of the mixed gas to 7 m / s -12 m / s.

2. The misting device according to claim 1, characterized in that: The evaporator is a microchannel evaporator.

3. The misting device according to claim 1, characterized in that: The water inlet of the evaporator is connected to the first metering pump.

4. The misting device according to claim 1, characterized in that: The temperature difference controller comprises a first air inlet and a second air inlet, wherein the first air inlet is communicated with the steam outlet of the evaporator, and the second air inlet is connected with a second metering pump.

5. The misting device according to claim 4, characterized in that: The first air inlet and the second air inlet are arranged vertically.

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