CN204003453U - A kind of variable-frequency screw air compressor - Google Patents
A kind of variable-frequency screw air compressor Download PDFInfo
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- CN204003453U CN204003453U CN201420442511.4U CN201420442511U CN204003453U CN 204003453 U CN204003453 U CN 204003453U CN 201420442511 U CN201420442511 U CN 201420442511U CN 204003453 U CN204003453 U CN 204003453U
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- main frame
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- air compressor
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Abstract
The utility model relates to air compressor and improves technical field, is specifically related to a kind of variable-frequency screw air compressor.This kind of variable-frequency screw air compressor, comprise the frequency variator being connected successively with power supply, motor, compression main frame and gas holder, described compression main frame includes one-level compression main frame, two-stage compression main frame and throw over switch, and one-level compression main frame and the parallel connection of two-stage compression main frame, described frequency variator, motor, one-level compression main frame and the close loop control circuit of gas holder composition, and in this close loop control circuit, be connected with the pressure tube of installation detecting device, described frequency variator, motor, two-stage compression main frame and gas holder composition open loop control loop, described throw over switch selection one-level compression main frame or two-stage compression main frame are in running order.The variable-frequency screw air compressor that the utility model provides, not only can save the electricity expense use of a considerable number, extends the working life of compression main frame, also can realize the object of constant pressure air feeding, improve production efficiency and product quality.
Description
Technical field
The utility model relates to air compressor and improves technical field, is specifically related to a kind of variable-frequency screw air compressor.
Background technique
Air compressor is the main body in compressed air source unit, and it is the device that the mechanical energy of prime mover is converted to gas pressure energy, is compressed-air actuated pressure generator.Air compressor, as one of major industrial product, is the requisite equipment of each factory.Traditional air compressor loads, power consumption when unloading is large, power frequency startup inrush current is large, at the bottom of automaticity, plant maintenance amount is large.
For addressing the above problem, application publication number is that CN 103742387 A disclose transformation air compressor frequency variator, it is characterized in that: described transformation air compressor frequency variator comprises frequency variator, motor, compressor and pressure transmitter, described frequency variator, motor and compressor connect successively, the other end of described frequency variator is connected with power supply, the other end of described compressor is connected with outlet pipe, is connected with in addition the pressure manifold that pressure transmitter is housed between described compressor and air conduit.
Adopt VFC commonplace for air compressor at present, but but can't reach satisfied effect for the VFC of screw-rod air compressor, often equipment running process power consumption is large, and cost is high, has increased many costs to equipment user.
Model utility content
For overcoming deficiency of the prior art, the utility model provides a kind of easy for installation, variable-frequency screw air compressor of using safety, environmental protection.
For achieving the above object, the technical solution adopted in the utility model is as follows: a kind of variable-frequency screw air compressor, comprise the frequency variator being connected successively with power supply, motor, compression main frame and gas holder, it is characterized in that: described compression main frame includes one-level compression main frame, two-stage compression main frame and throw over switch, and one-level compression main frame and the parallel connection of two-stage compression main frame, described frequency variator, motor, one-level compression main frame and the close loop control circuit of gas holder composition, and in this close loop control circuit, be connected with the pressure tube of installation detecting device, described frequency variator, motor, two-stage compression main frame and gas holder composition open loop control loop, described throw over switch selection one-level compression main frame or two-stage compression main frame are in running order.
Further, detection device comprises pressure transmitter and PID regulator.
Further, comprise alarm system, this alarm system is connected with detection device.
Further, the pressure surge scope of gas holder is less than 0.02MPa.
Further, also comprise high temperature protection device, this high temperature protection device comprises temperature sensing probe and supply disconnecton device, and this temperature sensing probe is connected to the exhaust port place of compression main frame.
From above-mentioned to description of the present utility model, compared with prior art, the variable-frequency screw air compressor that the utility model provides, not only can save the electricity expense of a considerable number uses, extend the working life of compression main frame, also can realize the object of constant pressure air feeding, improve production efficiency and product quality, tool has the following advantages:
1, energy-conservation reaching more than 30%, pressure when loading remains at required setting working pressure, when unloading time consume energy be 30% left and right adding while unloading;
2, inrush current little, reduce to electrical network without impact, frequency variator can make electric motor starting, load time electric current rise gently, without any impact, can make motor realize soft stop, avoid the anti-harm that electric current causes of giving birth to, be conducive to the working life of extension device;
3, delivery pressure is stable, makes the pressure of the gas in supply air line keep constant, improve production efficiency and product quality;
4, plant maintenance amount is little, and air compressor variable frequency starting electric current is less than rated current, and adding feather valve need not perseveration, frequency conversion air compressor is according to gas consumption self-regulation motor rotating speed, and operation frequency is low, and rotating speed is slow, bearing wear is little, and service life of equipment extends, and maintenance workload diminishes;
5, noise is low, and frequency variator is according to providing energy with gas, and motor rotation frequency is low, and therefore mechanical rotation noise diminishes, and frequency conversion, to regulate the mode of motor speed, need not repeatedly load, unload, and has eliminated frequent pressurization unloading, the unstable noise producing of air pressure.
Brief description of the drawings
Fig. 1 is the structural representation of variable-frequency screw air compressor.
Fig. 2 is the principle schematic of variable-frequency screw air compressor.
Embodiment
Below by embodiment, the utility model will be further described.
A kind of variable-frequency screw air compressor, a kind of variable-frequency screw air compressor, comprises power supply 1, frequency variator 2, motor 3, compression main frame 4, gas holder 5, pressure tube 6, alarm system 7;
Power supply 1, frequency variator 2, motor 3, compression main frame 4, gas holder 5 connect successively;
Compression main frame 4 includes one-level compression main frame 41, two-stage compression main frame 42 and throw over switch, wherein one-level compression main frame 41 and 42 parallel connections of two-stage compression main frame, power supply 1, frequency variator 2, motor 3, one-level compression main frame 41 and gas holder 5 form close loop control circuit, power supply 1, frequency variator 2, motor 3, two-stage compression main frame 42 and gas holder 5 form open loop control loop, by throw over switch select one-level compression main frame or two-stage compression main frame in running order;
The pressure surge scope of gas holder 5 is less than 0.02MPa;
Pressure tube 6 is connected in close loop control circuit, and pressure transmitter 61 and PID regulator 62 are installed on pressure tube 6;
Alarm system 7 is connected with PID regulator 62;
High temperature protection device, this high temperature protection device comprises temperature sensing probe and supply disconnecton device, and this temperature sensing probe is connected to the exhaust port place of compression main frame 4, and supply disconnecton device can be cut off the electricity supply, and makes to compress main frame emergency shutdown.
Shown in Fig. 1, Fig. 2, the workflow of above-mentioned variable-frequency screw air compressor is as follows:
Adopt Open loop and closed loop two to overlap control loop and make to compress that main frame 4 has frequency conversion and power frequency two is overlapped control loop, frequency variator one drag two starts, and can select frequency conversion/power frequency startup by throw over switch;
When normal operation, one-level compression main frame 41 is in frequency control of motor speed state, and two-stage compression main frame 42 is in power frequency state; Pressure transmitter 61 detected pressures pipe 6 outlet pressures, and with setting value comparison, through PID regulator 62 ordering calculations, obtain frequency signal, adjusting rotary speed reaches required pressure;
While stopping, press stop button, PLC controls all contactors and disconnects, and frequency variator quits work;
When air compressor normally moves, should note following some:
(1) while guaranteeing that abnormal protection appears in frequency conversion, be unlikely to normally carrying out of impact production, prevent non sinusoidal wave interference air compressor controller, frequency variator input end has the effective measures that suppress electromagnetic interference, guide line, signaling line adopt shielded cable, when wiring and power cable separately, prevent from introducing and disturb;
(2) keep when motor frequency conversion running state gas holder 5 outlet pressures stable, pressure surge scope can not exceed according to 0.02MPa;
(3) compression main frame 4 does not allow under low frequency, to move for a long time, and rotational speed of air compressor is too low, makes air compressor bad stability on the one hand, makes on the other hand lubricating cylinders degree variation yet, and meeting enhance faster wear, so work lower limit is not less than 30Hz;
(4) high temperature protection device is in the time that system pressure exceedes setting value, and supply disconnecton device can cut off host power supply automatically, makes to compress main frame 4 emergency shutdowns; High temperature protection, in the time that compression main frame 4 delivery temperatures exceed setting, is moved by the temperature sensing probe control temperature electric contact that is connected on compression main frame 4 vent ports places, automatically cuts off motor power, makes to compress the anxious shutdown of main frame 4.
Above are only some embodiments of the present utility model, but design concept of the present utility model is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the utility model, all should belong to the behavior of invading the utility model protection domain.
Claims (5)
1. a variable-frequency screw air compressor, comprise the frequency variator being connected successively with power supply, motor, compression main frame and gas holder, it is characterized in that: described compression main frame includes one-level compression main frame, two-stage compression main frame and throw over switch, and one-level compression main frame and the parallel connection of two-stage compression main frame, described frequency variator, motor, one-level compression main frame and the close loop control circuit of gas holder composition, and in this close loop control circuit, be connected with the pressure tube of installation detecting device, described frequency variator, motor, two-stage compression main frame and gas holder composition open loop control loop, described throw over switch selection one-level compression main frame or two-stage compression main frame are in running order.
2. variable-frequency screw air compressor according to claim 1, is characterized in that: described detection device comprises pressure transmitter and PID regulator.
3. variable-frequency screw air compressor according to claim 1 and 2, is characterized in that: also comprise alarm system, this alarm system is connected with detection device.
4. variable-frequency screw air compressor according to claim 3, is characterized in that: the pressure surge scope of described gas holder is less than 0.02MPa.
5. variable-frequency screw air compressor according to claim 1, is characterized in that: also comprise high temperature protection device, this high temperature protection device comprises temperature sensing probe and supply disconnecton device, and this temperature sensing probe is connected to the exhaust port place of compression main frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420442511.4U CN204003453U (en) | 2014-08-07 | 2014-08-07 | A kind of variable-frequency screw air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420442511.4U CN204003453U (en) | 2014-08-07 | 2014-08-07 | A kind of variable-frequency screw air compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204003453U true CN204003453U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420442511.4U Expired - Fee Related CN204003453U (en) | 2014-08-07 | 2014-08-07 | A kind of variable-frequency screw air compressor |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305929A (en) * | 2015-11-18 | 2016-02-03 | 苏州信利昌电子材料有限公司 | Variable-frequency speed regulation device |
| CN106609754A (en) * | 2015-07-24 | 2017-05-03 | 池州汉诺威机电设备科技有限公司 | Screw rod air compressor frequency conversion control system |
| CN110067753A (en) * | 2019-03-18 | 2019-07-30 | 苏州寿力气体设备有限公司 | Dry screw rod frequency conversion air compressor and its control method |
-
2014
- 2014-08-07 CN CN201420442511.4U patent/CN204003453U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106609754A (en) * | 2015-07-24 | 2017-05-03 | 池州汉诺威机电设备科技有限公司 | Screw rod air compressor frequency conversion control system |
| CN105305929A (en) * | 2015-11-18 | 2016-02-03 | 苏州信利昌电子材料有限公司 | Variable-frequency speed regulation device |
| CN110067753A (en) * | 2019-03-18 | 2019-07-30 | 苏州寿力气体设备有限公司 | Dry screw rod frequency conversion air compressor and its control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20150807 |
|
| EXPY | Termination of patent right or utility model |