PUMP DEVICE

• Main Authors: NISHIMURA SHUNICHI, TANABE MASATOSHI, NAKASUJI AKIRA
• Format: Patent
• Language: English
• Published: 17.01.1995
• Edition: 6
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRICITY; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; RESISTORS; WEAPONS

PURPOSE:To prevent freezing by means of a heater which is excellent in safety and has high thermal insulation efficiency by arranging a positive temperature coefficient resistance element heater under a pump casing in order to heat water staying in the casing so as not to freeze. CONSTITUTION:When a pump is stopped, the inside of a water channel is held in a full water condition. When an atmosphere temperature becomes 0 deg.C or below in this condition, staying water in a part constituting the pump freezes, and the pump constituting part is broken down. In order to prevent this, when a temperature becomes a constant temperature or below, a temperature relay 25 is closed, and an electric current is carried to a positive temperature coefficient resistance element heater 19, and it is heated. A part of generated heat is conducted to a casing 2 through a heater receiving part 18, and reaches a certain constant temperature respectively by a temperature rise in the staying water in the casing 2 or by circulation of the staying water in a check valve 4 or a separating chamber 7, and can prevent freezing. A part of the heat is conducted to a suction joint 5 through a heater presser 20, and the staying water in the suction joint 5 and a suction flange 6 rises in temperature.