Fan with sound-muffling box

A fan with the sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a single inlet centrifugal fan disposed in the body, the single inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• a casing inlet port;
• a fan casing having a casing side plate on a side thereof, the casing side plate having the casing inlet port;
• a motor;
• and
• a single inlet impeller driven by the motor;
• an inlet-port sound absorber disposed between the body air inlet and the single inlet centrifugal fan;
• casing-inlet-port-side air passage formed in space between the body air inlet and the casing inlet port, the space being sandwiched between the single inlet centrifugal fan and inner surface of the body that face the casing inlet port;
• and
• a first inlet-port-sound-absorber air passage formed to have a triangular prism shape by cutting a corner of a ridge line of the inlet-port sound absorber.

A fan with a sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a double inlet centrifugal fan disposed in the body, the double inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• casing inlet ports;
• a fan casing having casing side plates on both sides thereof, the casing side plates having the casing inlet ports;
• a motor disposed on a side of one of the casing inlet ports;
• and
• a double inlet impeller driven by the motor;
• an inlet-port sound absorber disposed between the body air inlet and the double inlet centrifugal fan;
• casing-inlet-port-side air passages formed in spaces between the body air inlet and the casing inlet ports, the spaces being sandwiched between the double inlet centrifugal fan and inner surfaces of the body that face the casing inlet ports;
• and
• a second inlet-port-sound-absorber air passage formed to have a rectangular prism shape in a space between a surface of the inlet-port sound absorber that does not face the casing-inlet-port-side air passages and an inner surface of the body that faces the inlet-port sound absorber.

A fan with the sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a single inlet centrifugal fan disposed in the body, the single inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• a casing inlet port;
• a fan casing having a casing side plate on a side thereof, the casing side plate having the casing inlet port;
• a motor;
• and
• a single inlet impeller driven by the motor;
• an inlet-port sound absorber disposed between the body air inlet and the single inlet centrifugal fan;
• casing-inlet-port-side air passage formed in space between the body air inlet and the casing inlet port, the space being sandwiched between the single inlet centrifugal fan and inner surface of the body that face the casing inlet port;
• and
• a second inlet-port-sound-absorber air passage formed to have a rectangular prism shape in a space between a surface of the inlet-port sound absorber that does not face the casing-inlet-port-side air passage and an inner surface of the body that face the inlet-port sound absorber.

A fan with a sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a double inlet centrifugal fan disposed in the body, the double inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• casing inlet ports;
• a fan casing having casing side plates on both sides thereof, the casing side plates having the casing inlet ports;
• a motor disposed on a side of one of the casing inlet ports;
• and
• a double inlet impeller driven by the motor;
• casing-inlet-port-side air passages formed in spaces between the body air inlet and the casing inlet ports, the spaces being sandwiched between the double inlet centrifugal fan and inner surfaces of the body that face the casing inlet ports;
• a body sound absorber between the casing inlet port and the inner surface of the body;
• and
• a rectifying member formed at the body sound absorber, the rectifying member having a vertical rectification stage and a horizontal rectification stage, wherein
• the rectifying member has a height smaller than a height inside the body, and is disposed to face the casing side plate in parallel therewith in the vicinity of the tongue of the casing side plates, thereby narrowing the casing-inlet-port-side air passages both toward the discharge port and from a body plane side on a tongue side of the double inlet centrifugal fan;
• the vertical rectification stage is located in front of the casing inlet port, and orthogonal to an airflow passing through the casing-inlet-port-side air passage;
• and
• the horizontal rectification stage is located in parallel with the airflow passing through the casing-inlet-port-side air passage.

A fan with the sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a single inlet centrifugal fan disposed in the body, the single inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• a casing inlet port;
• a fan casing having a casing side plate on a side thereof, the casing side plate having the casing inlet port;
• a motor;
• and
• a single inlet impeller driven by the motor;
• casing-inlet-port-side air passage formed in spaces between the body air inlet and the casing inlet port, the space being sandwiched between the single inlet centrifugal fan and inner surface of the body that face the casing inlet port;
• a body sound absorber between the casing inlet port and the inner surface of the body;
• and
• a rectifying member formed at the body sound absorber, the rectifying member having a vertical rectification stage and a horizontal rectification stage, wherein
• the rectifying member has a height smaller than a height inside the body, and is disposed to face the casing side plate in parallel therewith in the vicinity of the tongue of the casing side plate, thereby narrowing the casing-inlet-port-side air passage both toward the discharge port and from a body plane side on a tongue side of the single inlet centrifugal fan;
• the vertical rectification stage is located in front of the casing inlet port, and orthogonal to an airflow passing through the casing-inlet-port-side air passage;
• and
• the horizontal rectification stage is located in parallel with the airflow passing through the casing-inlet-port-side air passage.

A fan with a sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a double inlet centrifugal fan disposed in the body, the double inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• casing inlet ports;
• a fan casing having casing side plates on both sides thereof, the casing side plates having the casing inlet ports;
• a motor disposed on a side of one of the casing inlet ports;
• and
• a double inlet impeller driven by the motor;
• casing-inlet-port-side air passages formed in spaces between the body air inlet and the casing inlet ports, the spaces being sandwiched between the double inlet centrifugal fan and inner surfaces of the body that face the casing inlet ports;
• a body sound absorber disposed between the casing inlet port and the inner surface of the body;
• and
• a guide member formed on the body sound absorber and having vertical guide stage, wherein
• the guide member has substantially a same height as a height inside the body and are disposed to face the casing side plate in parallel therewith, thereby narrowing the casing-inlet-port-side air passage toward the discharge port;
• and
• the vertical guide stage is located in front of the casing inlet port, and orthogonal to an airflow passing through the casing-inlet-port-side air passage.

A fan with the sound deadening box, the fan comprising:

• a box-shaped body having a body air inlet and a body air outlet facing each other;
• a single inlet centrifugal fan disposed in the body, the single inlet centrifugal fan including:
• a discharge port;
• a spiral scroll;
• a casing inlet port;
• a fan casing having a casing side plate on a side thereof, the casing side plate having the casing inlet port;
• a motor;
• and <a single inlet impeller driven by the motor;
• casing-inlet-port-side air passage formed in spaces between the body air inlet and the casing inlet port, the space being sandwiched between the single inlet centrifugal fan and inner surface of the body that face the casing inlet port;
• a body sound absorber disposed between the casing inlet port and the inner surface of the body;
• and
• a guide member formed on the body sound absorber and having vertical guide stage, wherein
• the guide member has substantially a same height as a height inside the body and are disposed to face the casing side plate in parallel therewith, thereby narrowing the casing-inlet-port-side air passage toward the discharge port;
• and
• the vertical guide stage is located in front of the casing inlet port, and orthogonal to an airflow passing through the casing-inlet-port-side air passage.