A flow guide screen for an ion air blower

Abstract

The utility model relates to a flow guide net cover for ion fan, belongs to the field of static electricity elimination. Set up a flow guide net cover, set up three second annular flow guide plates with the certain angle of direction with air outlet and / or air inlet direction in the edge position of flow guide net cover and ion fan metal net cover corresponding, adopt four fixed ribs with installation clamping groove to be fixed together between each annular flow guide plate, the whole flow guide net cover is clamped into metal net cover through installation clamping groove, and is fixed with metal net cover integral. Through the second annular flow guide plate of wide angle setting, can make ion fan form wide angle ion wind, and then form greater range positive and negative ion distribution, enlarge the electricity elimination range of ion fan. Can be widely used in the field of ion fan design and manufacture.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of active electrostatic elimination device, and particularly relates to a flow guide screen for an ion air blower. BACKGROUND

[0002] In the production process of high-tech products, controlling static electricity is an important measure to improve production efficiency, improve quality and increase profits. In the production of semiconductors, hard disks and flat panel displays (FPDs), using an ion air blower is one of the basic production conditions for achieving static electricity control. Because the work area requiring electrostatic elimination in production is large, the demand for ion air blowers is large, but considering the limited installation space and use cost, the requirement for a wide range of electrostatic elimination capability of the ion air blower is proposed.

[0003] The ion air blower ionizes the air molecules flowing through the electrode needle to form positive and negative ions, and the positive and negative ions move to the surface of the object with the airflow to eliminate the static charge on the surface of the object.

[0004] The entire process of the airflow flowing through the ion air blower can be seen in Figure 1 The airflow is brought into the ion air blower 1 by the axial flow fan through the rear screen 3 inlet, and then flows through the discharge cylinder or discharge needle holder 2, at this time part of the air molecules are ionized and continue to flow forward driven by the airflow, and finally is delivered out of the front screen 4 outlet. Among them, the inlet and outlet are provided with metal screens, one is to play a safety protection role, and the other is that the metal screen of the outlet forms a discharge structure with the high-voltage electrode needle to produce ionization effect.

[0005] However, the existing ion air blower product, due to the design of the discharge cylinder / discharge needle holder and the screen, causes the ion wind to move in a relatively concentrated state, and the electrostatic elimination range is narrow, which cannot meet the purpose of wide-range electrostatic elimination.

[0006] As shown in Figure 2 , Figure 3-1 , Figure 3-2 The screen used in the existing ion air blower is mostly the metal screen 5 shown in the patent CN202020322563.3, which is fixed on a plastic screen holder 6. Since such a metal screen has no airflow adjustment or guiding function, the ion wind is restricted by the discharge cylinder / discharge needle holder, and cannot form a wide-angle diffusion flow, nor can it form a more concentrated and rapid forward flow.

[0007] The existing technical solutions have the following technical defects:

[0008] 1) The metal screen of the existing ion air blower cannot make the ion air blower produce more concentrated and rapid ion wind, thereby forming a more concentrated positive and negative ion density distribution, resulting in an unsatisfactory electrostatic elimination speed in the front direction, and cannot achieve a higher electrostatic elimination speed.

[0009] 2) The metal mesh cover of the existing ion fan cannot enable the ion fan to generate a wider angle of ion wind, thereby forming a large-scale positive and negative ion distribution, resulting in a smaller power dissipation range.

[0010] Therefore, there is an urgent need for an ion fan product that meets market demand and has a wide ion coverage range. Summary of the Invention

[0011] The technical problem to be solved by this invention is to provide a guide net for an ion fan. Through a second annular guide plate arranged at a wide angle, the ion fan can generate a wide-angle ion wind, thereby creating a larger distribution of positive and negative ions and expanding the static elimination range of the ion fan. The arrangement of the first annular guide plate helps the airflow of the ion fan to travel further in a shorter time, thus carrying the air ions generated at the electrode needles further, achieving the effect of expanding the static elimination range and shortening the static elimination time.

[0012] The technical solution of the present invention is: to provide a flow guide mesh cover for an ion fan, characterized in that:

[0013] A flow guide mesh is installed; at the edge position corresponding to the flow guide mesh and the metal mesh of the ion fan, three second annular flow guide plates are installed at a certain angle to the direction of the air outlet and / or air inlet; the annular flow guide plates are fixed together by four fixing ribs with mounting slots; the entire flow guide mesh is inserted into the metal mesh through the mounting slots and fixed together with the metal mesh.

[0014] Furthermore, at the center position of the guide mesh cover corresponding to the metal mesh cover of the ion fan, two first annular guide plates parallel to the direction of the air outlet and / or air inlet are also provided.

[0015] Furthermore, whether or not the first annular guide vane is installed, or its specific location and quantity, depends on the structure of the axial fan and its airflow pattern.

[0016] Specifically, the first annular guide plate is parallel to the direction of the air outlet and / or air inlet, and the thickness of the first annular guide plate is consistent with the diameter of the metal mesh wire in the metal mesh cover.

[0017] Specifically, the flow guide mesh cover and the metal mesh cover are interference-fitted and fixed as one unit.

[0018] Further, when the air outlet and the air inlet of the ion fan are provided with the flow guide net cover, the air inlet flow guide cover, the ion fan axial flow fan, the discharge cylinder and the air outlet flow guide cover of the ion fan are combined to form a Laval nozzle structure, so that the airflow of the ion fan flows to a farther place in a shorter time, and the air ions generated by ionization at the electrode needle are carried to a farther place, so that the effect of expanding the electric field elimination range and shortening the electric field elimination time is realized.

[0019] Specifically, the second annular flow guide plate is at an included angle θ with the direction of the air outlet and / or the air inlet, and the calculation formula of the included angle θ is:

[0020]

[0021] In the formula, R is the electric field elimination radius, r is the radius of the outermost circle of the flow guide plate, and H is the test height.

[0022] The thickness of the second annular flow guide plate is consistent with the diameter of the metal wire of the metal net cover.

[0023] Further, the interval distance of the two first annular flow guide plates is an integer multiple of the interval distance between the metal wires of the metal net cover, and the interval distance of the three second annular flow guide plates is an integer multiple of the interval distance between the metal wires of the metal net cover, so as to avoid causing additional wind resistance to the airflow.

[0024] Specifically, the four fixing ribs are arranged at 90° with each other, so that the entire flow guide net cover is clamped into the metal net cover and integrated with the metal net cover.

[0025] Further, the airflow distribution of the ion fan is in the shape of a circular truncated cone, and the electric field elimination area is subject to the following formula:

[0026] (Vxt) 2 =R 2 +H 2

[0027] In the formula, V is the airflow velocity, t is the ion lifetime, R is the electric field elimination radius, and H is the test height.

[0028] Compared with the prior art, the advantages of the present application are:

[0029] 1. In the technical solution, the first annular flow guide plate at the center of the flow guide cover is horizontally arranged, so that the central part of the air outlet of the ion fan can generate more concentrated and fast forward ion wind, and further form more concentrated positive and negative ion density distribution, thereby improving the electric field elimination speed in the front direction.

[0030] 2. In the technical solution, the second annular flow guide plate at the periphery of the flow guide cover is arranged at a wide angle, so that the ion fan can form a wide-angle ion wind, and further form a larger range of positive and negative ion distribution, thereby expanding the electric field elimination range of the ion fan. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the airflow process in an ion fan.

[0032] Figure 2 This is a screen for existing ion fan technology;

[0033] Figure 3-1 This is a front view of the metal mesh cover of an existing ion fan.

[0034] Figure 3-2 This is a side view of the metal mesh cover of an existing ion fan.

[0035] Figure 4 Schematic diagram of the static elimination area of ​​the axial flow fan ion fan;

[0036] Figure 5 This is a diagram illustrating the tilt angle of the guide vane in this technical solution;

[0037] Figure 6 A 3D structural diagram of the flow guide mesh cover;

[0038] Figure 7 Front view of the air guide mesh cover;

[0039] Figure 8 Rear view of the air guide mesh cover;

[0040] Figure 9 Side view of the flow guide mesh cover;

[0041] Figure 10-1 Front view of the integrated flow guide mesh cover and metal mesh cover fastener;

[0042] Figure 10-2 Rear view showing the airflow guide mesh and metal mesh cover integrated into one piece;

[0043] Figure 10-3 A side sectional view showing the flow guide mesh and metal mesh integrated into one piece;

[0044] Figure 10-4 A partially enlarged side section view of the flow guide mesh and the metal mesh cover fastened together;

[0045] Figure 11 This is a schematic diagram showing the structural relationship between the flow guide mesh and the ion fan in this technical solution;

[0046] Figure 12 This is a schematic diagram of the airflow of the ion fan with the guide mesh cover in this technical solution;

[0047] Figure 13 This is a schematic diagram of the air duct structure formed by the air guide mesh and the ion fan in this technical solution;

[0048] Figure 14This is a schematic diagram of an ion fan's static electricity elimination test.

[0049] In the figure, 1 is the ion fan, 2a and 2b are the discharge cylinder or discharge needle holder, 3 is the rear mesh cover, 4 is the front mesh cover, 5 is the metal mesh cover, 6 is the plastic cover frame, 7 is the static elimination area, 8 is the fixing rib, 9 is the mounting slot, 10 is the first annular guide plate, 11 is the first annular guide plate, 12 is the second annular guide plate, 12a is the root of the inclined guide plate, and 13 is the flat plate tester.

[0050] r is the radius of the guide vane, θ is the tilt angle of the guide vane, H is the test height, R is the static elimination radius, and L is the horizontal test distance. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] The positive and negative ions generated by ionizers ionize the air have a very short lifespan, typically only tens of seconds to a few minutes. In factory production areas, the lifespan of air ions is even shorter, possibly only a few seconds, and the ion concentration (quantity) decreases exponentially with increasing distance. Therefore, the static elimination area of ​​an ionizer (in...) Figure 4 (Represented by numeral 7) and the dissipation time are limited by the ion lifetime. To enable the ion fan to reach farther and wider areas before the end of its ion lifetime, this technical solution, without changing the existing ion fan structure, constructs a flow guide mesh cover using a metal mesh cover as the structural basis in a low-cost manner:

[0053] 1. At the center of the existing ion fan metal mesh cover, a first annular guide plate 11 is set parallel to the direction of the air outlet and / or air inlet, and the thickness of the first annular guide plate is the same as the diameter of the metal mesh wire.

[0054] 2. At the edge of the existing ion fan metal mesh cover, a second annular guide plate 12 is set at a certain angle to the direction of the air outlet and / or air inlet. The thickness of the second annular guide plate is the same as the diameter of the metal mesh wire.

[0055] 3. Each guide plate is fixed by four fixing ribs 8 with mounting slots 9, while the entire guide mesh is snapped into the metal mesh and integrated with the metal mesh.

[0056] 4. The tilt angle of the second guide plate mentioned above should be set according to the anti-static area; the airflow distribution of the axial fan ion fan is frustum-shaped, see... Figure 4 As shown, its static elimination region 7 is constrained by the following formula:

[0057] (V×t) 2 =R 2 +H 2

[0058] where V is the air flow velocity, t is the ion lifetime, R is the Debye radius, and H is the test height, see Figure 5

[0059] Therefore, the inclination angle of the second deflector can be determined by the following formula:

[0060]

[0061] where r is the radius of the outermost ring deflector.

[0062] Specifically, the technical solution increases a deflection net cover that realizes interference fit with the metal net cover without changing the structure of the original ion fan:

[0063] 1. See Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10-1 to 10-3 , two first annular deflectors 11 (also referred to as horizontal deflectors) that are parallel to the direction of the air outlet and / or air inlet are arranged at the center position of the deflection net cover, i.e., the center position corresponding to the axial flow fan. As viewed perpendicularly from the direction of the air outlet and / or air inlet, the horizontal deflectors coincide with the metal wires of the metal net cover (see Figure 10-3 , 10-4 ). The thickness of the horizontal deflectors is consistent with the diameter of the metal wires, and the interval distance between the two horizontal deflectors is an integer multiple of the interval distance between the metal wires of the metal net cover. Such arrangement can avoid additional wind resistance to the air flow.

[0064] 2. It is worth noting that the arrangement of the first or second deflectors not only considers the flow pattern of the air flow, but also considers the interaction between positive and negative ions in the air flow, i.e., the arrangement of the deflectors should not increase the recombination probability of positive and negative ions, so as to reduce the number of positive and negative ions. Therefore, whether the first annular deflector is arranged or not, and the specific arrangement position and number, should be determined according to the structure of the axial flow fan and the flow pattern of the air flow.

[0065] 3. Three second annular deflectors 12 (also referred to as inclined deflectors) that form a certain angle with the direction of the air outlet and / or air inlet are arranged at the edge position of the deflection net cover, i.e., the edge position corresponding to the metal net cover of the existing ion fan. The thickness of the inclined deflectors is consistent with the diameter of the metal wires, and as viewed perpendicularly from the direction of the air outlet and / or air inlet, the root 12a of the inclined deflectors coincides with the metal wires of the metal net cover (see Figure 10-3 , 10-4 ). The interval distance between the three inclined deflectors is an integer multiple of the interval distance between the metal wires of the metal net cover. Such arrangement can avoid additional wind resistance to the air flow.

[0066] 4. See Figure 8 ,​Figure 10-2 As shown, the four fixing ribs 8 with mounting slots 9 are used to fix the five annular baffles together, and the four fixing ribs are arranged at 90° to each other. In this way, the whole flow guide cover can be clamped on the metal cover and integrated with the metal cover.

[0067] 5. The inclination angle of the inclined baffles should be set according to the electric field elimination area. The airflow blown by the axial flow fan ion air blower is distributed in a circular truncated cone shape, as shown in Figure 4 The electric field elimination area is subject to the following formula:

[0068] (V x t) 2 = R 2 + H 2

[0069] In the formula, V is the airflow rate, t is the ion lifetime, R is the electric field elimination radius, and H is the test height, as shown in Figure 5 The maximum value of the airflow rate is determined by the axial flow fan and can be measured by a wind speed tester. Therefore, the farthest distance that the ions can move is V x t. Once one of the variables, the electric field elimination radius or the test height, is determined, the other variable can be obtained.

[0070] The inclination angle of the inclined baffles is determined by the following formula:

[0071]

[0072] In the formula, r is the radius of the outermost ring of baffles.

[0073] 6. The flow guide cover can also be clamped on the metal cover at the air inlet of the ion air blower 1, as shown in Figure 11 Thus, a Laval nozzle structure (see Figure 12 , Figure 13 ) is formed by the air inlet flow guide cover, the axial flow fan of the ion air blower, the discharge cylinder, and the air outlet flow guide cover. This structure has the effect of accelerating airflow, which can make the airflow of the ion air blower flow to a farther place in a shorter time, and further carry the air ions generated by ionization at the electrode needle to a farther place, achieving the effect of expanding the electric field elimination range and shortening the electric field elimination time.

[0074] Embodiment

[0075] To verify the technical effect of the flow guide cover in the above technical solution, comparative electric field elimination tests were conducted on an existing ion air blower without a flow guide cover and the same ion air blower with a flow guide cover. The test schematic diagram is shown in Figure 14 The test data comparison is shown in Table 1:

[0076] Table 1 Comparison of electric field elimination test data of ion air blowers with and without flow guide covers

[0077]

[0078] Note:

[0079] 1. The test instrument used is Trek156A flat plate charge tester

[0080] 2. The static decay test voltage is: ±1000V→±100V

[0081] From the above comparison test data, it can be seen that:

[0082] 1. The position directly opposite the air outlet of the ion fan (X=0, Z=600), the ion fan with the flow guide screen cover has slightly faster electric elimination speed than the ion fan without the flow guide screen cover, which shows that more positive and negative ions move to the electric elimination position at a faster speed to eliminate the static charge on the flat plate charge tester, and the electric elimination capacity of the ion fan concentrated in the direction of the air outlet is enhanced.

[0083] 2. In the inclined direction of the air outlet of the ion fan, such as at the position (X=-250, Z=600; +250, Z=600), the electric elimination speed of the ion fan with the flow guide screen cover is significantly faster than that of the ion fan without the flow guide screen cover, which shows that more positive and negative ions move to the electric elimination position at a faster speed to eliminate the static charge on the flat plate charge tester, and the electric elimination capacity of the ion fan in a wider range is effectively enhanced.

[0084] The technical scheme of the present application can form a wide-angle ion wind of the ion fan through the second annular flow guide plate arranged at a wide angle, thereby forming a larger range of positive and negative ion distribution, expanding the electric elimination range of the ion fan; the arrangement of the first annular flow guide plate helps the airflow of the ion fan to flow to a farther place in a shorter time, thereby carrying the air ions generated by ionization at the electrode needle to a farther place, achieving the effect of expanding the electric elimination range and shortening the electric elimination time.

[0085] The present application can be widely used in the field of design and manufacture of ion fans.

Claims

1. A guide screen for an ion air blower, characterized by: providing a guide screen; providing three second annular guide plates at the edge of the guide screen corresponding to the metal screen of the ion air blower, the second annular guide plates being at an angle to the direction of the air outlet and / or air inlet; fixing the second annular guide plates together by four fixing ribs with mounting slots; fixing the guide screen to the metal screen by the mounting slots; providing two first annular guide plates at the center of the guide screen corresponding to the metal screen of the ion air blower, the first annular guide plates being parallel to the direction of the air outlet and / or air inlet; the guide screen forms a wide-angle ion wind through the wide-angle second annular guide plates, thereby forming a larger range of positive and negative ion distribution and expanding the ion air blower's electric field elimination range; the first annular guide plates help the airflow of the ion air blower to flow further in a shorter time, thereby carrying the air ions generated by the electrode needles to a further distance, achieving the effect of expanding the electric field elimination range and shortening the electric field elimination time; wherein the second annular guide plates are at an angle θ to the direction of the air outlet and / or air inlet, the angle θ being calculated by the formula: ； wherein R is the electric field elimination radius, r is the radius of the outermost guide plate, and H is the test height; when the air outlet and air inlet of the ion air blower are provided with the guide screen, the air inlet guide screen, ion air blower axial flow fan, discharge cylinder, and air outlet guide screen of the ion air blower combine to form a Laval nozzle structure, enabling the airflow of the ion air blower to flow further in a shorter time, thereby carrying the air ions generated by the electrode needles to a further distance, achieving the effect of expanding the electric field elimination range and shortening the electric field elimination time.

2. The flow screen for an ion air mover of claim 1, wherein The thickness of the first annular guide plate is consistent with the diameter of the metal screen wire in the metal screen.

3. The flow screen for an ion air mover of claim 1, wherein The guide screen and the metal screen are fixed together by interference fit.

4. The flow screen for an ion air mover of claim 1, wherein The thickness of the second annular guide plate is consistent with the diameter of the metal screen wire in the metal screen.

5. The screen for an ion air flow generator according to claim 1, wherein The distance between the two first annular guide plates is an integer multiple of the distance between the metal screen wires, and the distance between the three second annular guide plates is an integer multiple of the distance between the metal screen wires, so as to avoid additional wind resistance to the airflow.

6. The flow screen for an ion air mover of claim 1, wherein The four fixing ribs are arranged at 90° to each other, enabling the guide screen to be fixed to the metal screen.

7. The flow screen for an ion air mover of claim 1, wherein The airflow distribution of the ion air blower is in the shape of a circular truncated cone, and the electric field elimination area is constrained by the following formula: ， wherein is the gas flow velocity, is the ion lifetime, is the discharge radius, is the test height.

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