Spiral case, fan and gas heater

• Main Authors: LIANG GUORONG, WEI FUQUAN
• Format: Patent
• Language: Chinese; English
• Published: 28.09.2018
• Subjects: BLASTING; FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; RANGES; VENTILATING; WEAPONS

The utility model provides a spiral case, fan and gas heater, fan include the impeller, and the spiral case includes: the bounding wall, first curb plate sets up and is connected with the bounding wall in the one end of bounding wall, the second curb plate sets up and is connected with the bounding wall at the other end of bounding wall, encloses the cavity that becomes to have the exhaust vent with first curb plate and bounding wall, the air -out tobacco pipe sets up on the bounding wall, communicates with the exhaust vent, the position department that the bounding wall is close to the exhaust vent is provided with to snail tongue sunken in the cavity, and the axis direction that the exhaust vent is close to to a side direction of snail tongue from impeller's central point extends to theopposite side of central point, and the top of snail tongue is higher than the central point of impeller on the axis direction of perpendicular to exhaust vent. The central point that the top of thisscheme snail tongue is hig