CN108923691B - Volumetric air compressor and method of operating the same - Google Patents
Volumetric air compressor and method of operating the same Download PDFInfo
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- CN108923691B CN108923691B CN201810888077.5A CN201810888077A CN108923691B CN 108923691 B CN108923691 B CN 108923691B CN 201810888077 A CN201810888077 A CN 201810888077A CN 108923691 B CN108923691 B CN 108923691B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P4/00—Arrangements specially adapted for regulating or controlling the speed or torque of electric motors that can be connected to two or more different electric power supplies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20945—Thermal management, e.g. inverter temperature control
Abstract
The invention relates to the technical field of air compressor protection, in particular to a positive displacement air compressor and an operation method thereof. The mode that adopts a plurality of converters to arrange is only provided power by a converter for inverter motor in same time section. The device comprises a variable frequency motor, at least two frequency converters, a frequency converter selection device, a line concentration isolation device and a microcontroller; the power input end of each frequency converter is connected to the power output end of the frequency converter selecting device one by one; the power output end of each frequency converter is connected to the power input end of the line concentration isolation device one to one; the power output end of the line concentration isolation device is connected to the power input end of the variable frequency motor; each frequency converter is respectively provided with a temperature detection mechanism; the control end of each temperature detection mechanism, the control end of each frequency converter, the control end of the frequency conversion motor, the control end of the frequency converter selection device and the control end of the line concentration isolation device are respectively connected with the microcontroller.
Description
Technical Field
The invention relates to the technical field of air compressor protection, in particular to a positive displacement air compressor and an operation method thereof.
Background
The air compressor is driven by the variable frequency motor to work, the frequency converter is equipment for providing power for the variable frequency motor, and in the process that the frequency converter provides power for the variable frequency motor, all electronic components in the frequency converter can generate heat, so that the frequency converter which works for a long time wholly generates heat, and further the more the heat on all electronic components in the frequency converter is accumulated, the more the electronic components in the frequency converter are burnt out, and the service life of the frequency converter is affected.
Disclosure of Invention
The invention provides a positive-displacement air compressor and an operation method thereof, which are used for solving the defect that a frequency converter on the existing air compressor is easy to burn out due to heat after working for a long time, and the positive-displacement air compressor adopts a mode of arranging a plurality of frequency converters, wherein in the same time section, only one frequency converter supplies power to a variable-frequency motor, and after the temperature of the frequency converter for supplying power is higher than a set temperature, the other frequency converter is automatically selected to supply power to the variable-frequency motor.
The technical problems are solved by the following technical proposal:
the air inlet system of the positive displacement air compressor is driven by a variable frequency motor of the air compressor to enter air; the device comprises at least two frequency converters, a loudspeaker, a frequency converter selecting device, a line concentration isolating device and a microcontroller; the frequency converter selecting device is provided with power output ends with the same number as the frequency converters; the line concentration isolation device is provided with power input ends with the same number as the frequency converters; the power input end of each frequency converter is connected to the power output end of the frequency converter selecting device one by one; the power output end of each frequency converter is connected to the power input end of the line concentration isolation device one to one; the power output end of the line concentration isolation device is connected to the power input end of the variable frequency motor; each frequency converter is respectively provided with a temperature detection mechanism; the loudspeaker, each temperature detection mechanism, the control end of each frequency converter, the control end of the frequency conversion motor, the control end of the frequency converter selection device and the control end of the line concentration isolation device are respectively connected with the microcontroller.
The operation method is suitable for the positive displacement air compressor, and only one frequency converter provides power for the variable frequency motor in the same time section; during the working period of the variable frequency motor, the temperature detection mechanism detects the temperature of the frequency converter in real time; when the temperature of one frequency converter is higher than the set temperature, the microcontroller instructs the frequency converter with the lowest temperature of the frequency converters which do not work at present to supply power for the frequency conversion motor, and cuts off the circuit connection line between the frequency converter which is in the high temperature state and supplies power for the frequency conversion motor when the frequency converter with the lowest temperature supplies power for the frequency conversion motor at the same time; so reciprocating, thereby guarantee the temperature on the converter can not rise too high and appear burning out the condition of converter. The display displays the current temperature of each frequency converter in real time. The display also simultaneously displays which frequency converter is used for supplying power to the frequency conversion motor in real time, so that the intuitiveness is good, and a user can know the current state of each frequency converter conveniently.
The mode that a plurality of converters were arranged is adopted to this scheme, in same time section, only provides the power for inverter motor by a converter to the temperature on this converter that provides the power is greater than the settlement temperature back automatic selection another converter and is the inverter motor power supply, and is efficient, and the flexibility is good, safe and reliable.
Preferably, the frequency converter selecting device comprises front-end relays with the same number as the frequency converters, and the control end of each front-end relay is respectively connected with the microcontroller; one end of each pre-relay is connected to the power output end of the frequency converter selection device one to one, and the other end of each pre-relay is connected to the power input end of the frequency converter selection device.
The pre-relay is adopted to select a specific frequency converter to supply power for the variable frequency motor, so that the flexibility is good.
Preferably, the line concentration isolation device comprises post relays with the same number as the frequency converters, and the control end of each post relay is respectively connected with the microcontroller; one end of each post relay is connected to the power input end of the line concentration isolation device one to one, and the other end of each post relay is connected to the power input end of the variable frequency motor.
The cooperation of the pre-relay and the post-relay is adopted to select a specific frequency converter to supply power for the variable frequency motor, so that the flexibility is good.
Preferably, a pre-relay and a post-relay form a relay same-response group pair, so that relay same-response group pairs with the number equal to that of the pre-relays are obtained; the control end of the pre-relay and the control end of the post-relay in the same relay and response group pair are connected to the microcontroller after being conducted and connected by a lead, and the control end of each pre-relay is respectively connected to different interfaces of the microcontroller.
A pre-relay and a post-relay cooperate in pairs to select the frequency converter to supply power for the variable frequency motor, so that the frequency converter with other frequency converters in the working process does not have electrification, and the safety, reliability and flexibility are good.
Preferably, a voltage zero-crossing detection device is arranged at the power output end of each frequency converter, and the voltage zero-crossing detection device is connected with the microcontroller.
And detecting the zero crossing point of the power supply output by the corresponding frequency converter by using a voltage zero crossing detection device. When the voltage zero-crossing detection device detects that the voltage output by the corresponding frequency converter is near the zero-crossing point, the pre-relay and the post-relay corresponding to the current frequency converter are cut off, and meanwhile, the pre-relay and the post-relay corresponding to the frequency converter to be selected are closed.
The adoption of the voltage zero-crossing detection device can enable the pre-relay and the post-relay to be in a low-voltage state when being opened or closed, so that the pre-relay and the post-relay are not easy to burn out, and the service lives of the pre-relay and the post-relay are greatly prolonged.
Preferably, the positive displacement air compressor further comprises a bracket; the temperature detection mechanism comprises a vertical block, a vertical sliding block, an extrusion spring, a thermosensitive telescopic block and a distance measuring sensor, wherein a vertical sliding cavity is formed in the vertical block, the vertical sliding block is arranged in the vertical sliding cavity of the vertical block in an up-down sliding mode, and the extrusion spring is arranged between the upper surface of the vertical sliding block and the inner top surface of the vertical sliding cavity in an extrusion mode; a cavity hole communicated with a vertical sliding cavity of the vertical block is formed in the lower surface of the vertical block, a stop bar is arranged in the cavity hole, and a ranging sensor is arranged on the upper surface of the stop bar; the frequency converter is fixed on the bracket, and the lower surface of the thermosensitive telescopic block is fixedly connected to the frequency converter; the upper surface of vertical slider fixed connection is on the support, and vertical slider is located the thermal expansion piece directly over.
Each ranging sensor uploads ranging signals to the microcontroller in real time. The heat sensitive telescopic block will be stretched upwards when heated. When the temperature of a certain frequency converter is higher than the set temperature, the heat-sensitive telescopic block arranged on the frequency converter is heated to be stretched upwards. When the corresponding distance measuring sensor detects that the thermosensitive telescopic block drives the corresponding vertical sliding block to move upwards to a set height, the distance measuring sensor immediately uploads a distance measuring signal to the microcontroller, the microcontroller immediately stops working of the corresponding frequency converter, and meanwhile the microcontroller enables the frequency converter corresponding to the distance measuring sensor with smaller distance detected by the current distance measuring sensor to work. Therefore, the temperature of each frequency converter in working can be ensured not to exceed the set temperature, so that the frequency converters are not easy to burn out, and the safety and reliability are high.
Preferably, the positive displacement air compressor further comprises a blower and a wind collecting bottle; the heat exchange tubes are respectively connected with the radiating fins of each frequency converter in a heat conduction way; the air outlet of the blower is in butt joint connection with the bottle mouth of the air collecting bottle, the air collecting bottle is provided with bottle air outlet holes with the same number as the heat exchange tubes, and the air inlet end of each heat exchange tube is in butt joint connection with the bottle air outlet holes of the air collecting bottle one by one; the control end of the blower is connected with the microcontroller.
Through the cooperation of hair-dryer and collection wind bottle want to correspond the converter and blow, let hot converter cooling, the reliability is high.
Preferably, the air inlet system comprises a first auxiliary rotating gear, a second auxiliary rotating gear, an air inlet cavity, a left air compression rotating wheel vertically rotating in the air inlet cavity, a right air compression rotating wheel vertically rotating in the air inlet cavity, an air inlet hole arranged at the bottom end of the air inlet cavity and an air outlet hole arranged at the top end of the air inlet cavity, wherein the right air compression rotating wheel is arranged right and right of the left air compression rotating wheel; the rotating shaft of the variable frequency motor is fixedly sleeved with a first gear, the rotating shaft of the right air compressing rotating wheel is fixedly sleeved with a second gear, the rotating shaft of the left air compressing rotating wheel is fixedly sleeved with a third gear, a chain is in driving connection with the first gear, the second gear and the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear, the rotating direction of the second gear is always opposite to that of the third gear, and the rotating direction of the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear is always identical to that of the first gear.
The air inlet system with the structure ensures high air inlet reliability and high energy conversion efficiency.
Preferably, the air inlet cavity comprises a left cavity with a semicircular left cavity wall of a cross section, a right cavity with a semicircular right cavity wall of a cross section and a rectangular cavity with a rectangular cross section, the left cavity is arranged at the left side of the rectangular cavity, the right cavity is arranged at the right side of the rectangular cavity, and the left cavity is communicated with the right cavity through the rectangular cavity; the center of the semicircular arc of the left cavity is located on the axis of the rotating shaft of the left air-compressing rotating wheel, and the center of the semicircular arc of the right cavity is located on the axis of the rotating shaft of the right air-compressing rotating wheel; the left air-compressing rotating wheel and the right air-compressing rotating wheel have the same structure, the left end and the right end of the right air-compressing rotating wheel are both convex arc surfaces, and the upper end and the lower end of the right air-compressing rotating wheel are both concave arc surfaces.
The rotation of the rotating shaft of the variable frequency motor drives a gear to rotate, the gear to rotate drives a gear II, a gear III, an auxiliary rotating gear II and an auxiliary rotating gear II to rotate through a chain, the rotation direction of the gear II is always opposite to that of the gear III, and the rotation directions of the gear III, the auxiliary rotating gear II and the auxiliary rotating gear II are always identical to that of the gear I. The second gear and the third gear respectively drive the right air compression rotating wheel and the left air compression rotating wheel to rotate in the air inlet cavity in a matching way, the right air compression rotating wheel and the left air compression rotating wheel suck air 83 into the air inlet cavity from the air inlet hole after rotating in the air inlet cavity in a matching way, and the air in the air inlet cavity is pressed into the air outlet hole for air use by the air compressor. The air inlet system with the structure ensures high air inlet reliability and high energy conversion efficiency.
The invention can achieve the following effects:
the invention has simple structure, adopts a mode of arranging a plurality of frequency converters, only one frequency converter provides power for the variable frequency motor in the same time section, and automatically selects the other frequency converter to supply power for the variable frequency motor after the temperature of the frequency converter providing the power is higher than the set temperature, thereby having high efficiency, good flexibility, safety and reliability.
Drawings
Fig. 1 is a schematic diagram of a principle connection structure of a variable frequency motor chain driving a left pneumatic rotating wheel, a right pneumatic rotating wheel and a right pneumatic rotating wheel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a cross-sectional connection structure of an air intake system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a connection structure of a frequency converter connected to a variable frequency motor according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a connection structure of a wind collecting bottle according to an embodiment of the present invention.
Fig. 5 is a schematic block diagram of a circuit principle connection structure according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a connection structure of the temperature detecting mechanism according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a state connection structure of a variable frequency motor driving a left pneumatic rotating wheel, a right pneumatic rotating wheel and a right pneumatic rotating wheel according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
In the embodiment, referring to fig. 1-7, an air inlet system of the positive displacement air compressor is driven by a variable frequency motor 31 of the air compressor to perform air inlet; the intelligent mobile phone comprises at least two frequency converters, a smart phone 62, a display 58, a loudspeaker 59, keys 60, a wireless module 61, a frequency converter selecting device 9, a line concentration isolating device 23 and a microcontroller 1; the frequency converter selecting device is provided with power output ends 14, 15 and 16 which are equal to the frequency converters in number; the line concentration isolation device is provided with power input ends 24, 25 and 26 which are equal to the frequency converters in number; the power input end of each frequency converter is connected to the power output end of the frequency converter selecting device one by one; the power output end of each frequency converter is connected to the power input end of the line concentration isolation device one to one; the power output end 30 of the line concentration isolation device is connected to the power input end of the variable frequency motor; a temperature detection mechanism 20, a temperature detection mechanism 21 and a temperature detection mechanism 22 are respectively arranged on each frequency converter; the display, the loudspeaker, the keys, the wireless module, each temperature detection mechanism, the control end of each frequency converter, the control end of the frequency conversion motor, the control end of the frequency converter selection device and the control end of the line concentration isolation device are respectively connected with the microcontroller; the intelligent mobile phone is in wireless connection with the microcontroller through the wireless module. The power input 10 of the frequency converter selection device is connected to the mains frequency power supply 8.
The frequency converters of this embodiment are three, namely, a frequency converter 17, a frequency converter 18 and a frequency converter 19. In this embodiment, a microcontroller of STM32 type is adopted, and the specific model is a microcontroller of STM32F103RBT6 type.
The frequency converter selection device comprises pre-relays 11, pre-relays 12 and pre-relays 13, the number of which is equal to that of the frequency converters, and the control end of each pre-relay is respectively connected with the microcontroller; one end of each pre-relay is connected to the power output end of the frequency converter selection device one by one, and the other end of each pre-relay is connected to the power input end 10 of the frequency converter selection device.
The line concentration isolation device comprises a post relay 27, a post relay 28 and a post relay 29, the number of which is equal to that of the frequency converters, and the control end of each post relay is respectively connected with the microcontroller; one end of each post relay is connected to the power input end of the line concentration isolation device one to one, and the other end of each post relay is connected to the power input end of the variable frequency motor.
A relay same-response group pair is formed by a front relay and a rear relay, so that relay same-response group pairs with the same number as the front relays are obtained; the control end of the pre-relay and the control end of the post-relay in the same relay and response group pair are connected to the microcontroller after being conducted and connected by a lead, and the control end of each pre-relay is respectively connected to different interfaces of the microcontroller.
The interfaces of the microcontroller 1 in fig. 1 of the present embodiment include an interface 2, an interface 3, an interface 4, an interface 5, an interface 6, and an interface 7. The control terminal of the pre-relay 11 and the control terminal of the post-relay 27 are connected together to the interface 3 of the microcontroller 1. The control terminal of the pre-relay 12 and the control terminal of the post-relay 28 are connected together to the interface 5 of the microcontroller 1. The control terminal of the pre-relay 13 and the control terminal of the post-relay 29 are connected together to the interface 4 of the microcontroller 1.
The power output end of each frequency converter is provided with a voltage zero crossing detection device which is connected with the microcontroller.
The voltage zero-crossing detection device 32 is arranged on the power output end of the frequency converter 17, the voltage zero-crossing detection device 33 is arranged on the power output end of the frequency converter 18, and the voltage zero-crossing detection device 34 is arranged on the power output end of the frequency converter 19.
The positive displacement air compressor also includes a bracket 57; the temperature detection mechanism comprises a vertical block 56, a vertical sliding block 46, a compression spring 45, a thermosensitive telescopic block and a distance measuring sensor, wherein the vertical block 56 is internally provided with a vertical sliding cavity, the vertical sliding block 46 is arranged in the vertical sliding cavity of the vertical block in an up-down sliding manner, and the compression spring 45 is arranged between the upper surface of the vertical sliding block and the inner top surface of the vertical sliding cavity in a compression manner; a cavity hole communicated with the vertical sliding cavity of the vertical block is formed in the lower surface of the vertical block, a stop bar 49 is arranged in the cavity hole, and a ranging sensor is arranged on the upper surface of the stop bar; the frequency converter is fixed on the bracket, and the lower surface of the thermosensitive telescopic block is fixedly connected to the frequency converter; the upper surface of vertical slider fixed connection is on the support, and vertical slider is located the thermal expansion piece directly over.
In this embodiment, the number of temperature detection mechanisms is three, and all the three temperature detection mechanisms have the same structure.
The temperature detection mechanism 20 corresponds to the frequency converter 17, the vertical slider 46, the heat-sensitive expansion block 51, and the distance measuring sensor 50.
The temperature detection mechanism 21 corresponds to the frequency converter 18, the vertical slider 47, the heat-sensitive expansion block 53, and the distance measuring sensor 52.
The temperature detecting mechanism 22 corresponds to the frequency converter 19, the vertical slider 48, the heat-sensitive expansion block 55, and the distance measuring sensor 54.
The temperature detection mechanism 20 is connected to the interface 2 of the microcontroller 1. The temperature detection means 21 is connected to the interface 7 of the microcontroller 1. The temperature detection means 22 is connected to the interface 6 of the microcontroller 1.
The positive displacement air compressor also includes a blower 42 and a collector bottle 35; the heat exchange tubes are respectively connected with the radiating fins of each frequency converter in a heat conduction way; the air outlet of the blower is in butt joint connection with the bottle mouth of the air collecting bottle, the air collecting bottle is provided with bottle air outlet holes with the same number as the heat exchange tubes, and the air inlet end of each heat exchange tube is in butt joint connection with the bottle air outlet holes of the air collecting bottle one by one; the control end of the blower is connected with the microcontroller.
The frequency converter 17 corresponds to a heat exchange tube 36. The inverter 18 corresponds to a heat exchanging tube 37. The frequency converter 19 corresponds to a heat exchange tube 38.
And each heat exchange tube is respectively provided with a solenoid valve connected with the microcontroller. The heat exchange tube 36 corresponds to a solenoid valve 39. Corresponding to the heat exchange tube 37 is a solenoid valve 40. The heat exchange tube 38 corresponds to a solenoid valve 41.
The air inlet system 74 comprises a first auxiliary rotating gear 82, a second auxiliary rotating gear 75, an air inlet cavity 63, a left air compression rotating wheel 69 vertically rotating in the air inlet cavity, a right air compression rotating wheel 70 vertically rotating in the air inlet cavity, an air inlet hole 81 arranged at the bottom end of the air inlet cavity and an air outlet hole 65 arranged at the top end of the air inlet cavity, wherein the right air compression rotating wheel is arranged right to the left air compression rotating wheel; the rotating shaft 78 of the variable frequency motor is fixedly provided with a first gear 77 in a sleeved mode, the rotating shaft 73 of the right air compressing rotating wheel is fixedly provided with a second gear 79 in a sleeved mode, the rotating shaft 68 of the left air compressing rotating wheel is fixedly provided with a third gear 80 in a sleeved mode, a chain 76 is connected to the first gear, the second gear and the third gear in a driving mode, the first auxiliary rotating gear and the second auxiliary rotating gear in a driving mode, the rotating direction of the second gear is always opposite to the rotating direction of the third gear, and the rotating directions of the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear are always identical to the rotating direction of the first gear.
The air inlet cavity comprises a left cavity 64 with a semicircular left cavity wall of a cross section, a right cavity 67 with a semicircular right cavity wall of a cross section and a rectangular cavity 66 with a rectangular cross section, the left cavity is arranged at the left side of the rectangular cavity, the right cavity is arranged at the right side of the rectangular cavity, and the left cavity is communicated with the right cavity through the rectangular cavity; the center of the semicircular arc of the left cavity is located on the axis of the rotating shaft of the left air-compressing rotating wheel, and the center of the semicircular arc of the right cavity is located on the axis of the rotating shaft of the right air-compressing rotating wheel; the left air-compressing rotating wheel and the right air-compressing rotating wheel have the same structure, the left end and the right end of the right air-compressing rotating wheel are both convex arc surfaces 72, and the upper end and the lower end of the right air-compressing rotating wheel are both concave arc surfaces 71.
The rotation of the rotating shaft of the variable frequency motor drives a gear to rotate, the gear to rotate drives a gear II, a gear III, an auxiliary rotating gear II and an auxiliary rotating gear II to rotate through a chain, the rotation direction of the gear II is always opposite to that of the gear III, and the rotation directions of the gear III, the auxiliary rotating gear II and the auxiliary rotating gear II are always identical to that of the gear I. The second gear and the third gear respectively drive the right air compression rotating wheel and the left air compression rotating wheel to rotate in the air inlet cavity in a matching way, the right air compression rotating wheel and the left air compression rotating wheel suck air 83 into the air inlet cavity from the air inlet hole after rotating in the air inlet cavity in a matching way, and the air in the air inlet cavity is pressed into the air outlet hole for air use by the air compressor.
A user can know which frequency converter is currently supplying power to the variable frequency motor through the keys and the loudspeaker, and can know the current temperature state of each frequency converter. The user can realize supervisory equipment and microcontroller communication connection through wireless module, and the user can long-range real-time check current each converter's operating condition, and the reliability is good, and intelligent degree of automation is high.
The display 58 also simultaneously displays in real time which frequency converter is currently supplying power to the frequency conversion motor, so that the intuitiveness is good, and the user can conveniently know the current state of each frequency converter.
The pre-relay is adopted to select a specific frequency converter to supply power for the variable frequency motor, so that the flexibility is good.
The cooperation of the pre-relay and the post-relay is adopted to select a specific frequency converter to supply power for the variable frequency motor, so that the flexibility is good.
A pre-relay and a post-relay cooperate in pairs to select the frequency converter to supply power for the variable frequency motor, so that the frequency converter with other frequency converters in the working process does not have electrification, and the safety, reliability and flexibility are good.
The adoption of the voltage zero-crossing detection device can enable the pre-relay and the post-relay to be in a low-voltage state when being opened or closed, so that the pre-relay and the post-relay are not easy to burn out, and the service lives of the pre-relay and the post-relay are greatly prolonged.
Each ranging sensor uploads ranging signals to the microcontroller in real time. The heat sensitive telescopic block will be stretched upwards when heated. When the temperature of a certain frequency converter is higher than the set temperature, the heat-sensitive telescopic block arranged on the frequency converter is heated to be stretched upwards. When the corresponding distance measuring sensor detects that the thermosensitive telescopic block drives the corresponding vertical sliding block to move upwards to a set height, the distance measuring sensor immediately uploads a distance measuring signal to the microcontroller, the microcontroller immediately stops working of the corresponding frequency converter, and meanwhile the microcontroller enables the frequency converter corresponding to the distance measuring sensor with smaller distance detected by the current distance measuring sensor to work. Therefore, the temperature of each frequency converter in working can be ensured not to exceed the set temperature, so that the frequency converters are not easy to burn out, and the safety and reliability are high.
Through the cooperation of hair-dryer and collection wind bottle want to correspond the converter and blow, let hot converter cooling, the reliability is high.
The electromagnetic valve can flexibly control the blower to blow air to the frequency converter, so that the blowing cooling effect is improved, and the structure is simple and the reliability is high.
The operation method is suitable for the positive displacement air compressor, and only one frequency converter provides power for the variable frequency motor in the same time section; during the working period of the variable frequency motor, the temperature detection mechanism detects the temperature of the frequency converter in real time; when the temperature of one frequency converter is higher than the set temperature, the microcontroller instructs the frequency converter with the lowest temperature of the frequency converters which do not work at present to supply power for the frequency conversion motor, and cuts off the circuit connection line between the frequency converter which is in the high temperature state and supplies power for the frequency conversion motor when the frequency converter with the lowest temperature supplies power for the frequency conversion motor at the same time; so reciprocating, thereby guarantee the temperature on the converter can not rise too high and appear burning out the condition of converter.
In the embodiment, a mode of arranging a plurality of frequency converters is adopted, only one frequency converter provides power for the variable frequency motor in the same time section, and after the temperature of the frequency converter providing power is higher than the set temperature, the other frequency converter is automatically selected to provide power for the variable frequency motor, so that the variable frequency motor is high in efficiency, good in flexibility, safe and reliable.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the embodiments are not limited to the above examples, and various changes or modifications may be made by one of ordinary skill in the art within the scope of the appended claims.
Claims (1)
1. The air inlet system of the positive displacement air compressor is driven by a variable frequency motor of the air compressor to enter air; the device is characterized by comprising at least two frequency converters, a loudspeaker, a frequency converter selecting device, a line concentration isolating device and a microcontroller; the frequency converter selecting device is provided with power output ends with the same number as the frequency converters; the line concentration isolation device is provided with power input ends with the same number as the frequency converters; the power input end of each frequency converter is connected to the power output end of the frequency converter selecting device one by one; the power output end of each frequency converter is connected to the power input end of the line concentration isolation device one to one; the power output end of the line concentration isolation device is connected to the power input end of the variable frequency motor; each frequency converter is respectively provided with a temperature detection mechanism; the loudspeaker, each temperature detection mechanism, the control end of each frequency converter, the control end of the frequency conversion motor, the control end of the frequency converter selection device and the control end of the line concentration isolation device are respectively connected with the microcontroller;
in the same time section, only one frequency converter provides power for the variable frequency motor, and after the temperature of the frequency converter providing power is higher than the set temperature, the other frequency converter is automatically selected to provide power for the variable frequency motor;
the frequency converter selection device comprises front-end relays with the same number as the frequency converters, and the control end of each front-end relay is respectively connected with the microcontroller; one end of each pre-relay is connected to the power output end of the frequency converter selection device one by one, and the other end of each pre-relay is connected to the power input end of the frequency converter selection device;
the line concentration isolation device comprises the post relays with the same number as the frequency converters, and the control end of each post relay is respectively connected with the microcontroller; one end of each post relay is connected to the power input end of the line concentration isolation device one to one, and the other end of each post relay is connected to the power input end of the variable frequency motor;
a relay same-response group pair is formed by a front relay and a rear relay, so that relay same-response group pairs with the same number as the front relays are obtained; the control end of the front relay and the control end of the rear relay in the same relay and response group pair are connected to the microcontroller after being conducted and connected by a lead, and the control end of each front relay is respectively connected to different interfaces of the microcontroller;
the front relay and the rear relay are matched in pairs to select the frequency converter to supply power for the variable frequency motor, so that the frequency converter does not have electrification when one frequency converter works;
a voltage zero crossing detection device is arranged at the power output end of each frequency converter and is connected with the microcontroller;
detecting the zero crossing point of the power supply output by the corresponding frequency converter by using a voltage zero crossing detection device; when the voltage zero-crossing detection device detects that the voltage output by the corresponding frequency converter is near a zero-crossing point, the pre-relay and the post-relay corresponding to the current frequency converter are cut off, and the pre-relay and the post-relay corresponding to the frequency converter to be selected are closed at the same time;
the positive displacement air compressor also comprises a bracket; the temperature detection mechanism comprises a vertical block, a vertical sliding block, an extrusion spring, a thermosensitive telescopic block and a distance measuring sensor, wherein a vertical sliding cavity is formed in the vertical block, the vertical sliding block is arranged in the vertical sliding cavity of the vertical block in an up-down sliding mode, and the extrusion spring is arranged between the upper surface of the vertical sliding block and the inner top surface of the vertical sliding cavity in an extrusion mode; a cavity hole communicated with a vertical sliding cavity of the vertical block is formed in the lower surface of the vertical block, a stop bar is arranged in the cavity hole, and a ranging sensor is arranged on the upper surface of the stop bar; the frequency converter is fixed on the bracket, and the lower surface of the thermosensitive telescopic block is fixedly connected to the frequency converter; the upper surface of the vertical sliding block is fixedly connected to the bracket, and the vertical sliding block is positioned right above the thermosensitive telescopic block;
each ranging sensor uploads ranging signals to the microcontroller in real time; the heat-sensitive telescopic block is heated to be stretched upwards; when the temperature of a certain frequency converter is higher than the set temperature, the thermosensitive telescopic block arranged on the frequency converter is heated to be stretched upwards; when the corresponding distance measuring sensor detects that the thermosensitive telescopic block drives the corresponding vertical sliding block to move upwards to a set height, the distance measuring sensor immediately uploads a distance measuring signal to the microcontroller, the microcontroller immediately stops the corresponding frequency converter, and the microcontroller simultaneously enables the frequency converter corresponding to the distance measuring sensor with smaller distance detected by the current distance measuring sensor to work; therefore, the temperature of each frequency converter in working can be ensured not to exceed the set temperature;
the air inlet system comprises a first auxiliary rotating gear, a second auxiliary rotating gear, an air inlet cavity, a left air compression rotating wheel vertically rotating in the air inlet cavity, a right air compression rotating wheel vertically rotating in the air inlet cavity, an air inlet hole arranged at the bottom end of the air inlet cavity and an air outlet hole arranged at the top end of the air inlet cavity, wherein the right air compression rotating wheel is arranged right of the left air compression rotating wheel; a first gear is fixedly sleeved on the rotating shaft of the variable frequency motor, a second gear is fixedly sleeved on the rotating shaft of the right air compressing rotating wheel, a third gear is fixedly sleeved on the rotating shaft of the left air compressing rotating wheel, a chain is in driving connection with the first gear, the second gear, the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear, the rotating direction of the second gear is always opposite to the rotating direction of the third gear, and the rotating directions of the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear are always identical to the rotating direction of the first gear;
the air inlet cavity comprises a left cavity with a semicircular left cavity wall of a cross section, a right cavity with a semicircular right cavity wall of a cross section and a rectangular cavity with a rectangular cross section, the left cavity is arranged at the left side of the rectangular cavity, the right cavity is arranged at the right side of the rectangular cavity, and the left cavity is communicated with the right cavity through the rectangular cavity; the center of the semicircular arc of the left cavity is located on the axis of the rotating shaft of the left air-compressing rotating wheel, and the center of the semicircular arc of the right cavity is located on the axis of the rotating shaft of the right air-compressing rotating wheel; the left air-compressing rotating wheel and the right air-compressing rotating wheel have the same structure, the left end and the right end of the right air-compressing rotating wheel are both convex arc surfaces, and the upper end and the lower end of the right air-compressing rotating wheel are both concave arc surfaces;
the rotation of the rotating shaft of the variable frequency motor drives the first gear to rotate, and the first gear rotates to drive the second gear, the third gear, the first auxiliary rotating gear and the second auxiliary rotating gear to rotate through the chain; the second gear and the third gear respectively drive the right air compression rotating wheel and the left air compression rotating wheel to rotate in the air inlet cavity in a matching way, the right air compression rotating wheel and the left air compression rotating wheel suck air into the air inlet cavity from the air inlet hole after rotating in the air inlet cavity in a matching way, and the air in the air inlet cavity is pressed into the air outlet hole for the air compressor to use;
the positive displacement air compressor also comprises a blower and a wind collecting bottle; the heat exchange tubes are respectively connected with the radiating fins of each frequency converter in a heat conduction way; the air outlet of the blower is in butt joint connection with the bottle mouth of the air collecting bottle, the air collecting bottle is provided with bottle air outlet holes with the same number as the heat exchange tubes, and the air inlet end of each heat exchange tube is in butt joint connection with the bottle air outlet holes of the air collecting bottle one by one; the control end of the blower is connected with the microcontroller;
blowing air to the corresponding frequency converter through the matching of the blower and the air collecting bottle, so that the hot frequency converter is cooled;
a user can know which frequency converter is currently supplying power to the variable frequency motor through the keys and the loudspeaker, and can know the current temperature state of each frequency converter.
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| SE0950190A1 (en) * | 2009-03-25 | 2010-09-26 | Ge Wind Energy Norway As | Diversity cabinet |
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| US5414339A (en) * | 1992-09-17 | 1995-05-09 | Hitachi Ltd | Electric vehicle control system |
| CN201118519Y (en) * | 2007-11-01 | 2008-09-17 | 天津市詹佛斯科技发展有限公司 | Packet car frequency converter controller for steel making |
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| CN108923691A (en) | 2018-11-30 |
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