초록 ▼

A pressure washer for use by an operator. A heat exchanger has a water input adapted to connect to a water source and has a water output providing discharge water. A water pump supples water to the heat. A temperature selector is responsive to operator. A burner in thermodynamic communication with t

A pressure washer for use by an operator. A heat exchanger has a water input adapted to connect to a water source and has a water output providing discharge water. A water pump supples water to the heat. A temperature selector is responsive to operator. A burner in thermodynamic communication with the heat exchanger applies heat to the heat exchanger and the water in the heat exchanger. The burner has a fuel input connecting a fuel source to the burner. A fuel switch selectively allows fuel from the fuel source to be supplied to the combustion chamber via the fuel input. A duty cycle timer has a uniform duty cycle and is energized when water flows through the heat exchanger. The duty cycle timer is responsive to the temperature selection switch to vary its duty cycle as a function of the operator input provided to the temperature selector. The duty cycle timer controls the fuel switch to supply fuel to the combustion chamber according to the duty cycle of the duty cycle timer whereby the duty cycle timer controls the burner and thereby controls temperature of the water in the heat exchanger. Preferably, the duty cycle has a minimum on time to maintain burner efficiency.

대표청구항 ▼

1. A pressure washer for use by an operator comprising:a heat exchanger having a water input adapted to connect to a water source and having a water output providing discharge water; a cycle timer responsive to the flow of water through the heat exchanger; a burner in thermodynamic communication wit

1. A pressure washer for use by an operator comprising:a heat exchanger having a water input adapted to connect to a water source and having a water output providing discharge water; a cycle timer responsive to the flow of water through the heat exchanger; a burner in thermodynamic communication with the heat exchanger for applying heat to the heat exchanger and to the water in the heat exchanger, said burner having a fuel input connecting a fuel source to the burner; and a fuel switch responsive to the cycle timer, said fuel switch selectively allowing fuel from the fuel source to be supplied to the burner via the fuel input, whereby the cycle timer controls a duty cycle of the fuel switch and thereby controls temperature of the water in the heat exchanger.