1. A high speed type impeller, comprising:
a disk shaped body having a shaft coupling hole into which a rotation shaft of a motor is coupled, an outer circumference of the body being widened from a top end to a bottom end thereof in an insertion direction of the rotation shaft so as to form a bent surface;
a plurality of blades installed on the bent surface of the body, wherein the plurality of blades are bent at a predetermined angle with respect to the rotation shaft; and
an upper reinforcing ring installed at the top end of the body, surrounding and in contact with an outer circumferential surface of the shaft coupling hole.
2. The high speed type impeller as claimed in claim 1, further comprising:
a motor mounting guide that protrudes from a bottom surface of the body to surround the motor; and
a lower reinforcing ring installed on an outer circumference of the motor mounting guide.
3. The high speed type impeller as claimed in claim 2, wherein the upper reinforcing ring and the lower reinforcing ring are installed by press fit.
4. The high speed type impeller as claimed in claim 3, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
5. The high speed type impeller as claimed in claim 2, wherein the upper reinforcing ring and the lower reinforcing ring are installed by insert molding.
6. The high speed type impeller as claimed in claim 5, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
7. The high speed type impeller as claimed in claim 2, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
8. A high speed type impeller, comprising:
a body having a shaft coupling hole configured to receive a rotation shaft of a motor wherein an outer circumference of the body gradually increases from a top end to a bottom end thereof in an insertion direction of the rotation shaft so as to form a bent surface, and wherein a step portion is formed on the top end of the body;
a plurality of blades installed on the bent surface of the body, wherein the plurality of blades are bent at a predetermined angle with respect to the rotation shaft; and
an upper reinforcing ring installed at the step portion of the body, surrounding and in contact with an outer circumferential surface of the shaft coupling hole.
9. The high speed type impeller as claimed in claim 8, further comprising:
a motor mounting guide that protrudes from a bottom surface of the body so as to define an installation space configured to receive the motor; and
a lower reinforcing ring installed on an outer circumference of the motor mounting guide.
10. The high speed type impeller as claimed in claim 9, wherein the upper reinforcing ring and the lower reinforcing ring are installed by fit-pressing.
11. The high speed type impeller as claimed in claim 10, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
12. The high speed type impeller as claimed in claim 9, wherein the upper reinforcing ring and the lower reinforcing ring are installed by insert molding.
13. The high speed type impeller as claimed in claim 12, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
14. The high speed type impeller as claimed in claim 9, wherein the upper reinforcing ring and the lower reinforcing ring are made of a material having higher durability than the body.
15. The high speed type impeller as claimed in claim 8, wherein an outer circumference of the upper reinforcing ring is continuous with a top end of the bent surface of the body.
16. A high speed impeller, comprising:
a disk shaped body having a shaft coupling hole extending through a central portion thereof, the shaft coupling hole being configured to receive a shaft of a motor therein, wherein an outer circumference of the body increases gradually from a top end to a bottom end thereof so as to define a curved surface;
a plurality of blades installed on the curved surface of the body, at a predetermined angle with respect to an extension direction of the shaft coupling hole; and
an upper reinforcing ring surrounding and in contact with an outer circumferential surface of a top end of the shaft coupling hole.
17. The high speed impeller of claim 16, further comprising:
a motor mounting guide that protrudes from a bottom surface of the body, at a portion thereof corresponding to the shaft coupling hole, wherein the motor mounting guide defines an installation space together with a corresponding portion of the bottom surface of the body, and wherein the installation space is configured to receive the motor therein; and
a lower reinforcing ring surrounding an outer circumferential surface of the motor mounting guide, at a portion thereof that meets the bottom surface of the body.
18. The high speed impeller of claim 17, further comprising a stepped portion formed on the outer circumferential surface of the top end of the shaft coupling hole, wherein the upper reinforcing ring is seated on the stepped portion.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vehicle ground fault electrical detection system for a vehicle AC electrical system, the AC electrical system including an AC step-up voltage transformer having a primary coil and a secondary coil for increasing the voltage supplied to the transformer, the secondary coil being coupled to a secondary ground, the voltage supplied to the primary coil of the transformer being a converted voltage from a vehicle battery having a battery ground, the ground fault electrical detection system comprising:
a fault detection circuit for detecting a short circuit between a secondary ground of the transformer and a battery ground, the fault detection circuit comprising:
a resistance element having a predetermined resistance value, the resistance element having one side connected to a supply voltage;
an electrical switching circuit connected to the resistance element for selectably coupling the other side of the resistance element to the secondary ground;
a fault detection sense line connected to a junction between the other side of the resistance element and the electrical switching circuit; and
a controller for selectably coupling the resistance element to the secondary ground, the controller being coupled to the fault detection sense line to receive a voltage signal for detecting the ground fault prior to a start-up of the AC step-up power transformation, the controller determining a ground fault based on a comparison responsive to the voltage signal and a predetermined comparative value.
2. The ground fault detection system of claim 1 wherein the fault detection sense line, the resistive element, and the secondary ground form a voltage bridge divider.
3. The ground fault detection system of claim 1 wherein the controller includes a microprocessor.
4. The ground fault detection system of claim 1 wherein the electrical switching circuit includes a power switch and a relay, the power switch coupling the relay to ground for energizing a relay coil of the relay, wherein the relay coil when energized couples the supply voltage via the resistance element to secondary ground.
5. The ground fault detection system of claim 4 wherein the power switch includes a power relay.
6. The ground fault detection system of claim 4 wherein the power switch includes a Mosfet.
7. A vehicle ground fault detection system for detecting a ground fault in a vehicle electrical circuit, the system comprising:
an AC step-up voltage circuit including an AC transformer having a primary coil and a secondary coil for increasing a voltage supplied to the AC transformer;
a microprocessor for determining a fault detection within the AC step-up voltage circuit;
a fault detection circuit for detecting a short circuit between a secondary ground of the transformer and a battery ground, the fault detection circuit comprising:
a resistance element having a predetermined resistance value, the resistance element connected to a supply voltage;
an electrical switching circuit connected to the resistance element for and the secondary ground; and
a fault detection sense line connected between the resistance element and the electrical switching circuit;
wherein the electrical switching circuit selectively couples the supply voltage via the resistance element to the secondary ground, andthe microprocessor monitors the fault detection sense line for determining an occurrence of the ground fault prior to a start-up of the AC step-up power transformation.
8. The ground fault detection system of claim 7 wherein the microprocessor determines an isolation resistance as a function of the measured voltage.
9. The ground fault detection system of claim 8 wherein a calculated isolation resistance of less than the resistance of the resistance element is determinative of a ground fault.
10. The ground fault detection system of claim 7 wherein the microprocessor generates a control signal for inhibiting the AC step-up power transformation in response to determining the occurrence of the ground fault.
11. The ground fault detection system of claim 7 wherein the electrical switching circuit includes a power switch and a relay, the power switch coupling the relay to ground for energizing a relay coil of the relay, wherein the relay coil when energized couples the supply voltage via the resistance element to secondary ground.
12. The ground fault detection system of claim 7 wherein the fault detection sense line, the resistive element, and the secondary ground form a voltage bridge divider.
13. A method for detecting a ground fault in a vehicle AC electrical system that includes an AC step-up transformer having a primary coil and a secondary coil with a secondary ground and a fault detection circuit that includes a supply voltage input line connected to a resistive element, an electrical switching circuit is connected between the resistive element and the secondary ground, and a fault detection sense line, the method for detecting the ground fault comprising the steps of:
selectively coupling the resistive element to the secondary ground via the electrical switching circuit;
monitoring the fault detection sense line; and
determining a ground fault within the vehicle AC electrical system prior to an AC voltage step-up transformation in response to the monitoring of the fault detection sense line.
14. The method of claim 13 wherein a microprocessor is connected to the fault detection sense line for monitoring a voltage on the fault detection sense line and for determining the occurrence of the ground fault.
15. The method of claim 14 wherein the step of determining the occurrence of the ground fault includes determining an isolation resistance as a function of the measured voltage, wherein the determined isolation resistance being less than a predetermined resistance value is indicative of a ground fault.
16. The method of claim 14 wherein the step of determining the occurrence of the ground fault includes determining an isolation resistance as a function of the measured voltage, wherein the determined isolation resistance being less than a resistance value of the resistance element is indicative of a ground fault.
17. The method of claim 13 further comprising the step of supplying an inhibit signal for inhibiting the AC step-up conversion, the inhibit signal being in response to determining the presence of the ground fault prior to an AC step-up transformation.
18. The method of claim 17 wherein the step of determining the ground fault is performed prior to turning the vehicle ignition to a run position.