Abstract:
A fluid injector for treating a surface of a flat display panel includes a case provided with a cavity for receiving fluid; a pair of nozzle guiders coupled to the case and disposed facing each other; a gap-adjusting plate disposed between the nozzle guiders to adjust a gap between the nozzle guiders; and a coupling device for coupling the nozzle guiders to the gap-adjusting plate.

Description:
BACKGROUND OF THE DISCLOSURE 
   1. Field of the Disclosure 
   The disclosure relates to a fluid injector, and more particularly to a fluid injector that can be used to treat a surface of a flat display panel, and that improves injection precision. 
   2. Description of Related Art 
   Generally, a fluid injector used for treating a surface of a flat display panel is formed having a length greater than a width of the panel, and is provided with a nozzle having an uneven surface. However, the uneven surface makes it difficult to uniformly treat an inner surface of the panel. Furthermore, when intervals between the nozzles are not uniform, the injection precision is deteriorated. 
   In addition, the conventional fluid injector has a drawback in that pressures of the injection nozzles are not uniform, so the surface of the panel cannot be precisely processed. 
   Furthermore, due to the length of the injection nozzle, the dispensing and flow rate of the fluid are not uniformly realized in the course of injecting the fluid. 
   SUMMARY OF THE DISCLOSURE 
   Accordingly, the disclosure is directed to a fluid injector that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
   The disclosure provides a fluid injector for treating a surface of a flat display panel that can enhance injection precision by uniformly forming an interval between nozzles. 
   The disclosure further provides a fluid injector for treating a flat display panel that can improve injection precision by uniformly forming fluid pressure at the nozzles. 
   The disclosure further provides a fluid injector for treating a flat display panel that can improve injection precision by not being affected by the length of a nozzle, thereby providing uniform fluid dispensing. 
   In one embodiment according to the disclosure, a fluid injector for treating a surface of a flat display panel includes a case provided with a cavity for receiving fluid; a pair of nozzle guiders coupled to the case and disposed facing each other; a gap-adjusting plate disposed between the nozzle guiders to adjust a gap between the nozzle guiders; and a coupling connecting the nozzle guiders to the gap-adjusting plate. 
   According to another embodiment, the disclosure provides a fluid injector for treating a surface of a flat display panel including a case provided with a cavity for receiving fluid, and a nozzle guider coupled to the case, the nozzle guider defining a nozzle portion and a pressure-adjusting cavity where pressure of the fluid is adjusted before being injected through the nozzle portion. 
   According to still another embodiment, the disclosure provides a fluid injector for treating a surface of a flat display panel including a case provided with a cavity for receiving fluid, a nozzle guider coupled to the case to define a nozzle portion, and a tube disposed in the cavity of the case to receive fluid from a fluid-supplying apparatus, the tube being provided with a plurality of exhaust holes arranged at predetermined intervals. 
   Both the foregoing general description and the following detailed description are exemplary and explanatory, and are intended to provide further explanation of the invention as claimed. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings are incorporated in and constitute a part of this disclosure, and illustrate embodiments of the disclosed fluid injectors, and together with the description serve to explain the principles thereof. In the drawings: 
       FIG. 1  is a perspective view of a fluid injector according to a preferred embodiment of the disclosure; 
       FIG. 2  is a sectional view taken along line A-A of  FIG. 1 ; and 
       FIG. 3  is a sectional view taken along line B-B of  FIG. 1 . 
   

   DETAILED DESCRIPTION 
   Reference will now be made in detail to the preferred embodiments of the fluid injector, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
     FIGS. 1 and 2  show a fluid injector including a case  1 , nozzle guiders  3  and  5  coupled to the case  1 , and a tube  7  disposed in a cavity  1   a  defined by the case  1 . The fluid can be liquid agents or fresh air, for example. 
   The case  1  and the cavity  1   a  are formed in a longitudinal direction. The tube  7  is disposed in the cavity  1   a  to receive the fluid from a separate fluid-supplying device (not shown). That is, the fluid is introduced into the case through a fitting  9  fitted on a side end of the case. The tube  7  may be omitted if required. That is, the fluid can be directly fed to the cavity  1   a  defined by the case  1 . The tube  7  is provided with exhaust holes  7   a  formed upwardly at predetermined intervals, and the exhaust holes  7   a  allow the fluid introduced horizontally to be directed into the cavity  1   a  of the case  1  in a vertical direction. 
   The nozzle guiders  3  and  5  are paired, having opposing surfaces treated so that they are not uneven. A plurality of gap-adjusting plates  11  are disposed between the nozzle guiders  3  and  5 . Passages  10  are defined by the gap-adjusting plates  11  and the nozzle guiders  3  and  5 , communicating with the cavity  1   a  of the case  1  and allowing the fluid to be directed to a nozzle portion  13  formed by the nozzle guiders  3  and  5 . 
   The nozzle guiders  3  and  5  and the gap-adjusting plate  11  are coupled to each other by a couple device, e.g., a fastener such as a bolt and nut, or a screw. 
   A pressure control cavity  15  is provided between the nozzle guiders  3  and  5  near the nozzle portion  13  to spray the fluid through the nozzle portion  13  at a uniform pressure. The fluid introduced into the tube  7  is uniformly adjusted in pressure while being directed to the cavity  1   a  through the exhaust holes  7   a.    
   The fluid flow process is described in more detail below. 
   When the fluid is supplied from the fluid supply device (not shown) to a side of the case  1 , the fluid is introduced into the tube  1  in a horizontal direction and is then exhausted to the cavity  1   a  of the case  1  through the exhaust hole  7   a  in a vertical direction, in the course of which the pressure of the fluid is uniformly adjusted while a flowing direction thereof is changed. As a result, the fluid is sprayed through the nozzle portion  13  along the passages  10  defined by the nozzle guiders  3  and  5  and the gap-adjusting plates  11 . At this point, since the pressure control cavity  15  is provided near the nozzle portion  13 , the fluid is temporarily collected in the cavity  15  to uniformly adjust the pressure. The adjusted fluid is uniformly sprayed through the nozzle portion  13 . 
   As described above, since a gap of the nozzle portion  13  is adjusted by the gap-adjusting plates  11 , the opposing surfaces of the nozzle guiders  3  and  5  can be easily treated, thereby reducing manufacturing costs. In addition, since the pressure of the fluid is uniformly adjusted while passing through the cavity  1   a  and the pressure-adjusting cavity  15 , the fluid can be sprayed at a uniform pressure even when the nozzle portion  13  is lengthened. As a result, the injection precision of the fluid is improved to ideally perform the surface treatment of the flat display panel. Furthermore, since the fluid is uniformly injected, it is possible to reduce the amount of fluid used. 
   Since it is easy to manufacture the relatively lengthened nozzle, manufacturing costs can be minimized. In addition, since the nozzle portion has a uniform gap, the fluid injection precision can be improved. 
   Furthermore, since the exhaust holes are formed to be vertical to the fluid inlet direction, the pressure and speed of the fluid can be uniformly adjusted while it changes its flowing direction, so the fluid injection precision can be further improved. 
   In addition, pressure of the fluid can be adjusted by the pressure-adjusting cavity immediately before it is injected through the nozzle portion, so the fluid injection precision can be further improved. 
   It will be apparent to those skilled in the art that various modifications and variations can be made in the disclosed fluid injector. Thus, the disclosure covers the modifications and variations of this invention provided they fall within the scope of the appended claims and their equivalents.