Abstract: A heat isolation cover for a heat blower comprises a casing having a receiving space; the casing being installed with a protection sleeve, a heat resistance unit and a fan and motor set; one end of the protection sleeve being formed as a converge opening portion; the heat resistance unit having an annular heat isolation unit and a heat emitting unit installed on the heat isolation unit; one end of the heat resistance unit resisting against an inner surface of the guide edge of the protection sleeve and another end thereof being combined to the buckling groove of the casing; and the fan and motor set being installed to a rear end of the heat resistance unit; the actuation of the fan and motor set being controlled by an electronic circuit; and the fan and motor set generating wind to blow the heat resistance unit.

Abstract: A heat isolation cover for a heat blower comprises a casing having a receiving space; the casing being installed with a protection sleeve, a heat resistance unit and a fan and motor set; one end of the protection sleeve being formed as a converge opening portion; the heat resistance unit having an annular heat isolation unit and a heat emitting unit installed on the heat isolation unit; one end of the heat resistance unit resisting against an inner surface of the guide edge of the protection sleeve and another end thereof being combined to the buckling groove of the casing; and the fan and motor set being installed to a rear end of the heat resistance unit; the actuation of the fan and motor set being controlled by an electronic circuit; and the fan and motor set generating wind to blow the heat resistance unit.

Abstract: A retaining device of a heat blower comprises two sliding grooves and two wings. Each of two sides at a rear end of a casing of the heat blower is formed with one of the two sliding grooves. Each of an upper and a lower ends of each wing has an elastic hook, respectively. By pressing the elastic hooks. The wings are embedded into respective sliding groove, and the wings are slidable with respect to the sliding groove. The wings can be pushed to move outwards to predetermined positions so as to increase the coverage and stability of the heat blower. The wings can be pushed inward along the sliding grooves for operation as being held by a user or for storage.

Abstract: A retaining device of a heat blower comprises two sliding grooves and four wings. Each of two sides at a rear end of a casing of the heat blower is formed with one of the two sliding grooves. Each of an upper and a lower ends of each wing has an elastic hook, respectively. By pressing the elastic hooks. The wings are embedded into respective sliding groove, and the wings are slidable with respect to the sliding groove. The wings can be pushed to move outwards to predetermined positions so as to increase the coverage and stability of the heat blower. The wings can be pushed inward along the sliding grooves for operation as being held by a user or for storage.

Abstract: A safety hot air blowing gun includes a housing, an inner barrel mounted inside the housing and holding a high-impedance resistance type heating element around the inside wall thereof, a nozzle tip fastened to the front side of the housing, a fan motor assembly mounted inside the housing behind the inner barrel and controlled to blow air through the inside of the inner barrel and the outside of the inner barrel within the housing, and a protective ring mounted within the housing to support the inner barrel, the protective ring having inside protruded portions abutted against the periphery of the inner barrel and defining a plurality of open spaces around the inner barrel for the passing of currents of air from the fan motor assembly to reduce the temperature of the peripheral wall of the inner barrel and to prevent the housing from deformation due to high temperature.

Abstract: A safety hot air blowing gun includes a housing, an inner barrel mounted inside the housing and holding a high-impedance resistance type heating element around the inside wall thereof, a nozzle tip fastened to the front side of the housing, a fan motor assembly mounted inside the housing behind the inner barrel and controlled to blow air through the inside of the inner barrel and the outside of the inner barrel within the housing, and a protective ring mounted within the housing to support the inner barrel, the protective ring having inside protruded portions abutted against the periphery of the inner barrel and defining a plurality of open spaces around the inner barrel for the passing of currents of air from the fan motor assembly to reduce the temperature of the peripheral wall of the inner barrel and to prevent the housing from deformation due to high temperature.

Abstract: An induced-draft fan for hot air gun/air dryer includes a casing, the casing having a motor mount and a plurality of spiral wing guides radially arranged around the fan mount, a fan blade unit, and a fan motor mounted in the motor mount and controlled to rotate the fan blade unit, the fan blade unit having a semispherical body coupled to the fan motor, and a plurality of blades radially spirally arranged around the semispherical peripheral surface of the semispherical body, the blades being curved in direction reversed to the spiral wing guides, each blade having a top wind cut face and a bottom side edge disposed in flush with the bottom edge of the semispherical peripheral surface of the semispherical body.

Abstract: A hot air-blower off-state residual heat preventive control circuit comprises a power voltage stabilizer circuit, a power frequency detection circuit, a microprocessor, a switching control circuit, a LED display circuit, an amplifier circuit, and a rectifier and noise control circuit, wherein when the user turns on the hot air-blower, the microprocessor drives a first bi-directional switch and a second bi-directional switch to turn on a main thermal resistor and a fan motor respectively; when the user turns off the hot air-blower, the microprocessor drives the first bi-directional switch to turn off the main thermal resistor and keeps the second bi-directional switch turning on the fan motor for a predetermined length of time, and then drives the second bi-directional switch to turn off the fan motor a predetermined length of time after off-state of the main thermal resistor.

Abstract: A hot air blowing gun includes a housing, an inner barrel mounted inside the housing and holding a high-impedance resistance type heating element around the inside wall thereof, a tapered, hollow, cylindrical nozzle fastened to the front side of the housing and spaced around the front side of the inner barrel, the nozzle having a slotted outward positioning flange fastened to the front side of the housing and spaced around the periphery of the inner barrel by a gap for ventilation, a fan motor assembly mounted inside the housing behind the inner barrel and controlled to blow air through the inner barrel and the nozzle, and a hollow, tapered protective cap fastened to the front side of the housing and suspended around the nozzle, the protective cap having an inside wall spaced from the periphery of the nozzle by a gap through which a part of the currents of air from the fan motor assembly passes to the outside of the hot air blowing gun via the protective cap to lower the temperature of the protective cap.

Abstract: A hot air blowing gun includes a housing, an inner barrel mounted inside the housing and holding a high-impedance resistance type heating element around the inside wall thereof, a tapered, hollow, cylindrical nozzle fastened to the front side of the housing and spaced around the front side of the inner barrel, the nozzle having a slotted outward positioning flange fastened to the front side of the housing and spaced around the periphery of the inner barrel by a gap for ventilation, a fan motor assembly mounted inside the housing behind the inner barrel and controlled to blow air through the inner barrel and the nozzle, and a hollow, tapered protective cap fastened to the front side of the housing and suspended around the nozzle, the protective cap having an inside wall spaced from the periphery of the nozzle by a gap through which a part of the currents of air from the fan motor assembly passes to the outside of the hot air blowing gun via the protective cap to lower the temperature of the protective cap.