The screw-rod air compressor exhaust control device
Technical field
The utility model relates to a kind of exhaust end base of oil injection threaded bolt formula air compressor, especially a kind of exhaust controlling method of screw-rod air compressor.
Background technique
At present, screw air compressor is little owing to vibration, power of motor is low, noise is low, efficient is high, exhaust pressure is stable, rate of fault is low, simple installation, be convenient to advantage such as maintenance and obtained application widely.
The critical piece of screw-rod air compressor is compressor, deaerator.Compressor is air-breathing by air-breathing filter and aspirating air pipe, lubricant oil injects air compression chamber simultaneously, compressor is cooled off and screw rod and bearing are lubricated, the fuel-air mixture body that compression produces enters in the deaerator through the deaerator inlet pipeline, oil is separated from oil gas mixture, pressurized air after the oil removing then enters outlet conduit through minimum pressure valve after filtration, supplies with each and uses with gas unit.Air compression chamber must keep certain pressure, promptly keeps certain pressure reduction power as lubrication oil circulation between deaerator and compressor.When guaranteeing that even compressor is interrupted air feed work, also supplying lubricating oil incessantly guarantees the circulation of lubricant oil, guarantees device security, and existing screw-rod air compressor is all by minimum pressure valve control exhaust, but this kind exhaust controlling method has following defective:
In a, the normal air feed process of compressor, after pressurized air that deaerator filters must be by minimum pressure valve, just can enter outlet conduit, minimum pressure valve adopts the sealing of spring prestressing force, when flowing through minimum pressure valve, pressurized air can produce the pressure loss of 5~6kPa, cause Compressor Discharge Pressure to raise, operation energy consumption increases;
B, because Compressor Discharge Pressure raises, cause the compressor apparatus load to increase the weight of, increased the running wastage of compressor, reduced the working life of equipment;
C, because Compressor Discharge Pressure raises, cause the deaerator working pressure to rise, the filtering effect of deaerator filter core reduces, and has increased the lubrication oil consumption of compressor operating.
The model utility content
In order to overcome the higher deficiency of Compressor Discharge Pressure of existing screw-rod air compressor, technical problem to be solved in the utility model provides a kind of screw-rod air compressor exhaust control device that can reduce the Compressor Discharge Pressure of rod-type air compressor.
The technological scheme that its technical problem that solves the utility model adopts is: the screw-rod air compressor exhaust control device, this device is arranged on after the deaerator, this device comprises pressure-detecting device and is provided with the outlet pipe of exhaust cut-off valve, the outlet pipe two ends are connected with outlet conduit with the deaerator outlet respectively, pressure-detecting device is arranged on the deaerator outlet port, the SC sigmal control that the exhaust cut-off valve is sent by pressure-detecting device.
The beneficial effects of the utility model are: when the exhaust pressure of compressor is elevated to the unlatching value, pressure-detecting device is opened the exhaust cut-off valve, as main exhaust passage, the pressurized air of generation directly enters outlet conduit by this exhaust passage with the exhaust pilot line.Because of the flow losses of this exhaust passage are very little, thus exhaust pressure can be reduced, and alleviated the machine utilization of compressor, and reduced the consumption of air feed energy consumption and lubricant oil, prolonged the working life of equipment.In addition, can on the inlet/outlet node at exhaust pilot line two ends, be parallel with another safety line, described safety line is provided with minimum pressure valve, the cracking pressure of minimum pressure valve is less than described unlatching value, under situations such as exhaust pilot line inefficacy, also can guarantee minimum exhaust pressure, guarantee the circulation of lubricant oil, guarantee device security.Owing to have an aforesaid advantage, the utility model has at fuel injection helical lobe compressor or other on equipment of similar vent systems important application prospects is arranged, and uses the utility model can reduce exhaust pressure 5~6kPa.
Description of drawings
Fig. 1 is existing screw-rod air compressor and venting gas appliance schematic representation thereof.
Fig. 2 is screw-rod air compressor of the present utility model and exhaust control device schematic representation thereof.
Be labeled as 1-compressor, 2-aspirating air pipe among the figure, 3-air draught filter, 4-venting check valve, 5-deaerator inlet pipeline, the 6-minimum pressure valve, 7-outlet conduit, 8-exhaust cut-off valve, the 9-pressure-detecting device, the 10-deaerator, the outlet of 10a-deaerator, 11-outlet pipe, A import node, the B-Egress node.
Filled arrows is depicted as airflow direction among the figure.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
As shown in Figure 2, screw-rod air compressor exhaust control device of the present utility model, this device is arranged on after the deaerator 10, this device comprises pressure-detecting device 9 and is provided with the outlet pipe 11 of exhaust cut-off valve 8, outlet pipe 11 two ends are connected with outlet conduit 7 with deaerator outlet 10a respectively, pressure-detecting device 9 is arranged on deaerator outlet 10a place, the SC sigmal control that exhaust cut-off valve 8 is sent by pressure-detecting device 9.Exhaust cut-off valve 8 is in closed condition under outage state; during work; reach the unlatching value if pressure-detecting device 9 detects exhaust pressure, then exhaust cut-off valve 8 is opened, and pressurized air enters outlet conduit 7 with to gas unit air feed; if detecting exhaust pressure, pressure-detecting device 9 is worth less than unlatching; then exhaust cut-off valve 8 cuts out, and ends air feed, during shutdown; earlier exhaust cut-off valve 8 cuts out, carry out the shutdown operation of compressor 1 again.
When exhaust pressure maintain the unlatching value and on the time, pressurized air directly enters outlet conduit by the exhaust pilot line, there has not been the pressure loss during exhaust at self-controlled type minimum pressure valve 6 places, can reduce exhaust pressure, and alleviated the machine utilization of compressor 1, reduce the consumption of air feed energy consumption and lubricant oil, prolonged the working life of equipment; When exhaust pressure was worth less than unlatching, not exhaust guaranteed minimum exhaust pressure, guaranteed the circulation of lubricant oil, guaranteed device security.
The sealing of exhaust pilot line or connection, the exhaust cut-off valve opens or closes in other words, the method of available automatically controlled, gas control, hydraulic control even realizes, for example realize by the on-off valve that gas control or hydraulic control are set on the exhaust pilot line, for the utility model, as long as avoid using the minimum pressure valve of self-controlled types such as spring prestressing force to be used as gas exhausting valve, just avoided the pressure loss at the minimum pressure valve place, hang down Compressor Discharge Pressure thereby can descend, promptly reached the purpose of this utility model in the identical condition of compressor horsepower.
If the exhaust pressure fluctuation takes place in the working procedure of compressor 1, then when exhaust pressure during less than the unlatching value and greater than the cracking pressure of minimum pressure valve 6, exhaust cut-off valve 8 cuts out, pressurized air enters outlet conduit 7 through minimum pressure valve 6, continue air feed, when exhaust pressure reached the unlatching value once more, exhaust cut-off valve 8 was opened once again, and pressurized air directly enters outlet conduit 7 through the exhaust pilot line again.
Better scheme is, is parallel with minimum pressure valve 6 on inlet/outlet node A, the B at exhaust cut-off valve 8 two ends, and the cracking pressure of minimum pressure valve 6 is less than described unlatching value.At this moment, minimum pressure valve 6 is as the safety valve that guarantees lubrication oil circulation, like this, when normal air feed continuously, avoided the pressure loss, if when abnormal conditions such as exhaust pilot line inefficacy take place, also can guarantee minimum exhaust pressure, guarantee the circulation of lubricant oil, guarantee device security.
Embodiment:
As shown in Figure 1, the working procedure of existing screw-rod air compressor is as follows, compressor 1 is air-breathing by air-breathing filter 3 and aspirating air pipe 2, lubricant oil injects air compression chamber simultaneously, compressor 1 is cooled off and screw rod and bearing are lubricated, the fuel-air mixture body that compression produces is in deaerator inlet pipeline 5 enters deaerator 10, oil is separated from oil gas mixture, pressurized air after the oil removing then enters outlet conduit 7 through minimum pressure valve 6 after filtration, supplies with each and uses with gas unit.
As shown in Figure 2, on existing screw-rod air compressor basis, transform, use screw-rod air compressor exhaust control device of the present utility model, outlet pipe in parallel 11 at minimum pressure valve 6 two ends, outlet pipe is provided with exhaust cut-off valve 8, the opening and closing of exhaust cut-off valve 8 are by pressure-detecting device 9 controls that are arranged on deaerator outlet 10a place, that is: when detected exhaust pressure is worth less than unlatching, exhaust cut-off valve 8 cuts out, outlet pipe 11 is in cut-off state, when detected exhaust pressure reached the unlatching value, exhaust cut-off valve 8 was opened, and outlet pipe 11 is in connected state; The unlatching value of exhaust cut-off valve 8 can be set, and the unlatching value should be higher than the cracking pressure of minimum pressure valve.Exhaust cut-off valve 8 is normally close valves, closes exhaust cut-off valve 8 before shutdown earlier, carries out the shutdown operation of compressor 1 again.
With SE260W-8 type fuel injection helical lobe compressor is example, uses exhaust controlling method of the present utility model and device, and with the vent systems comparison of present use, the annual operating cost of saving of single device can reach 10,000 yuan.