US 5,367,787 A · Drying machine

Abstract

A drying machine has a drying chamber for drying an article cleaned with an inflammable solvent as a detergent. A hot air supply channel communicates with the drying chamber and a heater is mounted in the hot air supply channel. A hot air evacuation channel communicates with the drying chamber and a hot air transfer device is mounted at a voluntary portion of the hot air supply channel and the hot air evacuation channel. A control device is provided for driving control of the heater. A first temperature sensor is mounted on the downstream side of the heater in the hot air supply channel and a second temperature sensor is mounted at a position shifted to the drying chamber in the hot air evacuation channel. The control device controls the heater so that the difference in the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor is kept within a safe temperature range.

Claims14

Dependent claims

A drying machine which comprises:

a drying chamber for drying an article cleaned with an inflammable solvent as a detergent;
a hot air supply channel communicating with the drying chamber;
a heater mounted in the hot air supply channel;
a hot air evacuation channel communicating with the drying chamber;
hot air transfer means mounted at a voluntary portion of the hot air supply channel and the hot air evacuation channel;
a first temperature sensor mounted on the downstream side of the heater in the hot air supply channel;
a second temperature sensor mounted at a position shifted to the drying chamber in the hot air evacuation channel;
and
control means for controlling the heater so that a difference between a temperature detected by the first temperature sensor and a temperature detected by the second temperature sensor is kept within a safe temperature range avoiding detrimental excessive heating of the inflammable solvent.

6 more elements

A drying machine which comprises:

a drying chamber for drying an article cleaned with an inflammable solvent as a detergent;
a hot air supply channel communicating to the drying chamber;
a heater mounted in the hot air supply channel;
a hot air evacuation channel communicating to the drying chamber;
hot air transfer means mounted at a voluntary portion of the hot air supply channel and the hot air evacuation channel;
and
control means for driving control of the heater;
a first temperature sensor mounted on the downstream side of the heater in the hot air supply channel;
a second temperature sensor mounted at a position shifted to the drying chamber in the hot air evacuation channel;
a hot air circulating channel provided between the hot air supply channel and the hot air evacuation channel and communicating to the hot air supply channel and the hot air evacuation channel;
a condenser mounted in the hot air circulating channel;
and
a third temperature sensor mounted on the downstream side of the condenser to detect the temperature of the air after condensation;
wherein the control means determines the gas concentration of the inflammable solvent gas at the hot air circulating channel based on the temperature detected by the third temperature sensor and calculates the safe temperature difference from the difference between the determined gas concentration and the predetermined safe gas concentration;
and the control means controls the heater so that the difference between the temperature detected by the first sensor and the temperature detected by the second sensor is kept within the safe temperature difference.

12 more elements

Dependencies are inferred from the claim text.

Drying machine

Life of this patent

Drying machine

Life of this patent

Abstract

Claims14