A gas compressor includes a compressor unit having a compressor body for compressing gas and an electricity-generation device generating electricity by obtaining a driving force by vaporizing a working fluid utilizing exhaust heat generated by a compressing action in the compressor body and expandin
A gas compressor includes a compressor unit having a compressor body for compressing gas and an electricity-generation device generating electricity by obtaining a driving force by vaporizing a working fluid utilizing exhaust heat generated by a compressing action in the compressor body and expanding the working fluid so as to utilize the power generated by the electricity-generation device as a power source, and includes a switch device switching between power from the electricity generation device and power from a commercial power supply to supply power to the power consumption equipment, and a control device detecting an electricity-generation amount or a value correlative to the electricity generation amount and switching between the powers by the switch device, thereby generating the power using exhaust heat as a heat source to surely drive an auxiliary machine by a simple configuration regardless of a shortage of the electricity generation amount.
대표청구항▼
1. A gas compressor including a compressor unit having a compressor body for compressing a gas and an electricity generation device for generating electricity by obtaining a driving force by vaporizing a working fluid utilizing exhaust heat generated by compressing action in the compressor body and
1. A gas compressor including a compressor unit having a compressor body for compressing a gas and an electricity generation device for generating electricity by obtaining a driving force by vaporizing a working fluid utilizing exhaust heat generated by compressing action in the compressor body and expanding the working fluid and utilizing power generated by the electricity generation device as a power supply of power consumption equipment in the gas compressor, comprising: a discharge temperature sensor for detecting a temperature of a compressed gas discharged from the compressor body,a switch device for switching between the power generated by the electricity generation device and power obtained from a commercial power supply to supply the power to the power consumption equipment, anda control device for making the switch device switch between the power generated by the electricity generation device and the power obtained from the commercial power supply on the basis of the temperature detected by the discharge temperature sensor;wherein the control device switches to supply the power from the commercial power supply to the power consumption equipment after activation of the gas compressor and to supply the power from the electricity generation device to the power consumption equipment when the temperature detected by the discharge temperature sensor becomes not less than a set temperature which has been set in advance. 2. The gas compressor according to claim 1, wherein the gas compressor is an oil-cooled gas compressor including an oil separator for separating oil from the compressed gas discharged from the compressor body, a gas pipe for sending the compressed gas from which the oil has been separated by the oil separator to a demander and an oil pipe for returning the oil separated by the oil separator to the compressor, andthe power generation device configures a Rankine cycle by including an exhaust heat recovery heat exchanger for exchanging heat between the oil flowing through the oil pipe and the working fluid to cool the oil and to heat and vaporize the working fluid, an expander which is driven by expanding the working fluid vaporized by the exhaust heat recovery heat exchanger, a condenser for cooling and condensing the working fluid from the expander, and a circulating pump for supplying the working fluid condensed by the condenser to the exhaust heat recovery heat exchanger, and includes an electric generator driven by the expander to generate electricity. 3. The gas compressor according to claim 2, further comprising: an air-cooled heat exchanger for cooling the oil flowing through the oil pipe; anda cooling fan for sending cooling air to the air-cooled heat exchanger, whereinthe exhaust heat recovery heat exchanger is disposed upstream of the air-cooled heat exchanger. 4. The gas compressor according to claim 3, wherein the air-cooled heat exchanger is adapted to cool also the compressed gas flowing through the gas pipe, and the exhaust heat recovery heat exchanger is adapted to recover heat also from the compressed gas flowing through the gas pipe. 5. The gas compressor according to claim 4, further comprising: an oil outlet temperature sensor for detecting a temperature of the gas gone out of the exhaust heat recovery heat exchanger, anda gas outlet temperature sensor for detecting a temperature of the compressed gas gone out of the exhaust heat recovery heat exchanger. 6. The gas compressor according to claim 5, wherein the power generated by the electricity generation device and the power obtained from the commercial power supply are switched by the control device via the switch device in accordance with the temperature of the oil detected by the oil outlet temperature sensor, the temperature of the compressed gas detected by the gas outlet temperature sensor, and a compressor discharge temperature detected by the discharge temperature sensor. 7. The gas compressor according to claim 5, wherein the control device arithmetically operates a generation amount of electricity generated by the electricity generation device on the basis of the compressor discharge temperature detected by the discharge temperature sensor, the temperature of the oil detected by the oil outlet temperature sensor and the temperature of the compressed gas detected by the gas outlet temperature sensor, and when the electricity generation amount is not less than an electricity generation amount which has been defined in advance, supplies the generated power from the electricity generation device to the power consumption equipment. 8. The gas compressor according to claim 3, wherein the power consumption equipment is a fan motor for driving the cooling fan. 9. The gas compressor according to claim 8, wherein the electric generator is a DC generator, the number of rotations of the fan motor for driving the cooling fan is controlled by supplying the power from the commercial power supply to the fan motor via an inverter, also DC power generated by the electricity generation device is supplied to the inverter, and the switch device for switching between the power generated by the electricity generation device and the power obtained from the commercial power supply so as to supply the power to the fan motor is incorporated into the inverter. 10. The gas compressor according to claim 9, wherein the control device controls the number of rotations of the cooling fan via the inverter on the basis of the temperature of the oil detected by the oil outlet temperature sensor such that the temperature of the oil reaches a predetermined temperature or a temperature within a predetermined temperature range. 11. The gas compressor according to claim 10, wherein the condenser of the electricity generation device is cooled with air sent from the cooling fan, a number of rotations of the cooling fan for the condenser is also controlled by the inverter, the inverter generates two frequencies so as to individually control the numbers of rotations of the cooling fan for the air-cooled heat exchanger and the cooling fan for the condenser, and the cooling fan for the condenser is controlled on the basis of the temperature of the oil detected by the oil outlet temperature sensor. 12. The gas compressor according to claim 2, wherein the condenser of the electricity generation device is cooled with air sent from the cooling fan, and the power consumption equipment is a fan motor for driving the cooling fan. 13. The gas compressor according to claim 12, wherein the electric generator is a DC generator, the number of rotations of the fan motor for driving the cooling fan is controlled by supplying the power from the commercial power supply to the fan motor via an inverter, also DC power generated by the electricity generation device is supplied to the inverter, and the switch device for switching between the power generated by the electricity generation device and the power obtained from the commercial power supply so as to supply the power to the fan motor is incorporated into the inverter. 14. The gas compressor according to claim 13, further comprising: an oil outlet temperature sensor for detecting the temperature of oil gone out of the exhaust heat recovery heat exchanger, whereinthe number of rotations of the cooling fan for the condenser is controlled by the inverter such that the temperature detected by the oil outlet temperature sensor reaches a predetermined temperature or a temperature within a predetermined temperature range. 15. The gas compressor according to claim 1, wherein the electricity generation device configures a Rankine cycle by including an exhaust heat recovery heat exchanger for exchanging heat between the compressed gas compressed by the compressor body and the working fluid to cool the compressed gas and to heat and vaporize the working fluid, an expander driven by expanding the working fluid vaporized by the exhaust heat recovery heat exchanger, a condenser for cooling and condensing the working fluid sent from the expander and a circulating pump for supplying the working fluid condensed by the condenser to the exhaust heat recovery heat exchanger, and includes an electric generator driven by the expander to generate electricity. 16. The gas compressor according to claim 15, wherein the power generator is a DC generator, and DC power generated by the DC generator is supplied to the power consumption equipment via an AC converter. 17. The gas compressor according to claim 16, wherein the compressor unit includes an air-cooled heat exchanger for cooling the compressed gas compressed by the compressor body and discharged, and a cooling fan for sending cooling air to the air-cooled heat exchanger, and the power consumption equipment is a fan motor for driving the cooling fan. 18. The gas compressor according to claim 17, wherein the electric generator is a DC generator, the number of rotations of the fan motor for driving the cooling fan is controlled by supplying the power from the commercial power supply to the fan motor via an inverter, also DC power generated by the electricity generation device is supplied to the inverter, and the switch device for switching between the power generated by the electricity generation device and the power obtained from the commercial power supply so as to supply the power to the fan motor is incorporated into the inverter.
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