초록 ▼

An elongated, flexible protective urethane member is bonded and firmly affixed to the leading edge of a glass fiber reinforced polyester skin fan blade for large diameter industrial water cooling tower fans. The polyester blade without such protective member would be subject to leading edge abrasion

An elongated, flexible protective urethane member is bonded and firmly affixed to the leading edge of a glass fiber reinforced polyester skin fan blade for large diameter industrial water cooling tower fans. The polyester blade without such protective member would be subject to leading edge abrasion and deterioration during use. The flexible protective member is applied to the blade prior to curing of the chemically thickened polyester skin. Firm bonding and adherence of the protective member to the leading edge of the blade skin is obtained by curing of the skin with the protective member in place over the leading edge of the blade. Mechanical connection of the urethane member to the polyeste blade body is accomplished by provision of a series of holes along opposed longitudinal margins of the member which allow fluid polyester resin to flow into such openings during cure of the blade body resin layers, and by application of a glass fiber reinforced synthetic resin hold-down strip over opposed longitudinally extending edges of the hold-down strips and adjacent areas of the blade skin. Thus, upon completion of the cure cyle, the polyester resin within the openings cross-links with the underlying resin material and the overlying hold-down strips to more securely lock the member to the blade body.

대표청구항 ▼

In a glass fiber reinforced, synthetic resin fan blade for large diameter industrial water cooling tower fans, wherein the outer body portion of the blade is constructed of a thermoset resin and has upper and lower surfaces of which a part thereof define an elongated leading which would be subject t

In a glass fiber reinforced, synthetic resin fan blade for large diameter industrial water cooling tower fans, wherein the outer body portion of the blade is constructed of a thermoset resin and has upper and lower surfaces of which a part thereof define an elongated leading which would be subject to abrasion deterioration during use of the blade, the improvement comprising: an elongated protective outermost sheet member having opposed, longitudinally extending edges and wrapped over at least a part of the longitudinal extent of the leading edge of the blade with one of the longitudinally extending edges of the member overlying the upper surface of the blade outer body portion and the other longitudinally extending edge of the member on the lower surface of the blade outer body portion, said member being bonded to the blade outer body portion throughout the transverse and longitudinal extent of the member, said member being fabricated of a flexible, urethane elastomer material which is more resistant to impact the abrasion during use of the blade under the operating conditions thereof than the resin making up the outer blade body portion; and means for mechanically attaching the member to the blade outer body portion substantially throughout the length of the member, said means for attaching the member to the blade outer body portion including upper and lower hold down strips of a synthetic resin and disposed in overlying relationship to the longitudinally extending edges of the member on the upper and lower surfaces of the blade outer body portion and over the longitudinally extending areas of the blade outer body portion which are adjacent respective longitudinally extending edges of the member, said member being provided with a series of openings therein, said openings being located adjacent and along both of the opposed longitudinally extending edges of the member substantially throughout the length of said member, the thermoset resin making up the blade outer body portion extending through respective openings in the member and being joined with an overlying hold down strip.