CN2195018Y

CN2195018Y - Automatic changeover valve

Info

Publication number: CN2195018Y
Application number: CN 94237681
Authority: CN
Inventors: 邵立明; 梁伟明; 丁卫国
Original assignee: Purifying Equipment Factory Of Lante Sci & Tech Dev Co Zhuhai City
Current assignee: Purifying Equipment Factory Of Lante Sci & Tech Dev Co Zhuhai City
Priority date: 1994-06-30
Filing date: 1994-06-30
Publication date: 1995-04-19
Anticipated expiration: 2004-06-30

Abstract

The utility model relates to an automatic change valve in a compressed air purifier, which is composed of a valve core piston, a valve shell, a piston rod, an end cover, a sealing ring, a sealing washer, a flange and a threaded stud. The automatic change valve realizes that the state switch of one cylinder from a dry purification state to a reverse blowing regeneration state is automatically carried out through the sudden change of gas pressure in valve chambers at both sides of the piston but is not controlled by a program controller through an electromagnetic valve. Thus, the compressed air purifier using the utility model has the advantages of light and compact integral structure, flexible operation, and accurate and reliable movement. The automatic change valve is especially suitable for being generalized and used in compressed air purifiers with large processing load.

Description

Automatic changeover valve

The utility model relates to the automatic diverter valve in a kind of compressed air purifier, belongs to the valve technology field.

After the suction of Compressed air drying cylindrical shell, the adsorptive power of siccative reduces gradually, after the outlet dew point reaches the effect point, must stop using the siccative of inefficacy, and its regeneration in time is dry, to recover dry adsorptive power.So, for the drying apparatus that requires continuous air feed, two dry cylindrical shells and regenerative system thereof must be arranged at least, make a cylindrical shell when carrying out dry decontamination, another cylindrical shell is regenerated to saturated sorbent and is cooled off.Two cylindrical shell alternate cycle sex works.In order to realize two cylindrical shell alternations, the system of control inlet stream ventilation must be arranged.At present, domestic some producer adopts four pneumatic cut-off valves, and as shown in Figure 1, wherein two valves (1,2) control inlet stream enters dry cylindrical shell, the discharge of the regeneration off gases stream of two valves (3,4) control water content.Four valves alternately open and close four valves at a certain time interval by programming controller 5 controls.For the high throughput situation, in four pneumatic cut-off valves, valve 1 and valve 2 control main air flows so that its valve body is controlled the volume of the valve 3 of regeneration air stream and valve 4 is a lot of greatly, make whole pipeline huge, complicated, and manufacturing cost is higher.Another kind method as shown in Figure 2, is to adopt two pneumatic cut-off valves (not drawing among Fig. 2) and a four-way switching valve 6, by the switching of three valves of programming controller 5 controls.Fig. 2 and Fig. 1 relatively though use a valve less, require the reliability of four-way valve higher; thereby high to the manufacturing requirement of four-way valve, the pulse cleaning device of this four-way valve of present domestic employing often exists action not really accurate; reliability is not very high problem, makes the shutdown maintenance increased frequency.

The purpose of this utility model is to overcome deficiency of the prior art and provides a kind of simple in structure, flexible operation, and reliable in action is accurately and the automatic diverter valve of being convenient to make.

The purpose of this utility model can realize by following measure:

The utility model is by valve core piston, valve chest, piston rod, end cap, seal ring, gasket seal, flange and stud bolt are formed, valve chest inside is valve pocket, valve chest middle part lateral opening, valve pocket is communicated with suction tude, valve core piston is fixed on the piston rod, can drive reciprocating in valve pocket by piston rod, the valve pocket two ends respectively have an end cap to be used for the support piston bar, and the reciprocating stroke of control piston, piston rod passes the center hole of two end caps, can in center hole, slidably reciprocate, the place that piston rod is passed on two end cap central bore both sides all has seal ring to prevent gas leakage, and respectively there is a flange end cap outside at valve pocket two ends, also has gasket seal to prevent gas leakage between end cap and the flange, the end cap and the flange at two ends tighten together by stud bolt, and the flange center hole at two ends connects steam outlet pipe by pipe thread.Between valve chest end face and the end cap surface of contact, and between piston and the end cap surface of contact, also there is seal ring to prevent gas leakage.

The drawing explanation of accompanying drawing:

Fig. 1 is for adopting the pulse cleaning method schematic representation of four pneumatic cut-off valves in the existing skill.

Fig. 2 comes the schematic representation of the method for pulse cleaning for the available technology adopting four-way valve.

Fig. 3 is for adopting pulse cleaning method schematic representation of the present utility model.

Fig. 4 is the utility model structural representation.

Now in conjunction with the accompanying drawings the utility model embodiment is described further:

As Fig. 4, the utility model embodiment is by valve core piston (7), valve chest (9), piston rod (10), end cap (11), seal ring (12,13,20,21), gasket seal (14), flange (15) and stud bolt (16) are formed, valve chest inside is valve pocket (8), there is an opening side, valve chest middle part, valve pocket (8) is communicated with suction tude (17), valve core piston (7) is fixed on the piston rod (10), can drive reciprocating in valve pocket (8) by piston rod (10), respectively there is an end cap (11) that has center hole at valve pocket (8) two ends, be used for the reciprocating stroke of control piston (7), piston rod (10) passes the center hole of two end caps (11) to be slidingly matched, can in center hole, slidably reciprocate, all there is seal ring (12 in the place that piston rod (10) is passed on each end cap (11) center hole both sides, 13) prevent gas leakage, respectively there is a flange (15) end cap (11) outside at valve pocket (8) two ends, also there is gasket seal (14) to prevent gas leakage between end cap (11) and the flange (15), the end cap at valve pocket two ends (11) tightens together by long stud bolt (16) with flange (15), and the center hole of the flange at two ends (15) connects steam outlet pipe (18) by pipe thread.Between valve chest (9) end face and end cap (11) surface of contact, and between piston (7) and end cap (11) surface of contact, also there is seal ring (20,21) to prevent gas leakage.Valve chest (9) bottom also has drain pipe (19).

The utility model embodiment's working procedure is referring to Fig. 3: adopt the utility model (23), add the pulse cleaning commutation pipeline that two pneumatic cut-off valves (24,25) just can be formed compressed air purifier in addition.When handling big flow gas, add an equalizer valve (26) again, three valves (24,25,26) are controlled by programming controller.When the dry absorption of cylindrical shell B, selector valve (23) piston (7) is beaten one side to cylindrical shell A, main air flow flows to cylindrical shell B by air intake through selector valve (23), cut-off valve (24) cuts out and open (25), main air flow is through cylindrical shell B drying, combination of flow formula single-way flow restricting valve (27), most of through gas outlet valve (28) outflow, the current limliting aperture on the combined type single-way flow restricting valve (29) of fraction on cylindrical shell A carries out pulse cleaning to the sorbent in the cylindrical shell A.Wet air after the regeneration is discharged into by baffler through valve (25) in the air.When sorbent was saturated nearly in the cylindrical shell B, programming controller cut-off valve (25) slowly raise cylindrical shell A internal pressure, when the pressure among the cylindrical shell A is identical with pressure among the cylindrical shell B, opened valve (24) by programming controller control.Because large flow-rate gas stream before this in the pipe before the valve of valve (24), suddenly open valve (24), the pressure by cylindrical shell B one side of combined type single-way flow restricting valve (23) is reduced than cylindrical shell A side suddenly, fall the pressure reduction of generation by instantaneous pressure and push valve core piston (7) to cylindrical shell B one side automatically, realize airflow-reversing.This shows that switching of the present utility model is to carry out automatically by the abrupt change of its piston both sides valve pocket gas pressure, rather than control by solenoid valve by programming controller.Under the situation of high throughput, add gas charging valve (26), when valve (24,25) when all shutting, open gas charging valve (26), air flow is carried out pressurising through valve (26) to another cylindrical shell, makes two cylindrical shells reach pressure with shortening and equates the needed time.So periodically work repeatedly, so that the pressurized air of dry decontamination to be provided continuously.

Compared with prior art, the utility model has dirty advantage:

1, the utility model structure is lightly compact, makes simple and easy to do. As shown in Figure 3, adopt method of the present utility model, with the method for prior art shown in Figure 1 relatively, use less two pneumatic cut-off valves. For the high throughput situation, in four pneumatic cut-off valves of Fig. 1, valve 1 and valve 2 control primary airs so that its valve body is controlled the volume of the valve 3 of regeneration air stream and valve 4 is much larger, so that whole pipeline is huge, complicated, are manufactured into higher.

2, the utility model flexible operation moves accurately and reliably good operating stability. Adopt Fig. 3 of the present utility model to compare with Fig. 2 of prior art; the method of Fig. 2 is higher to the reliability requirement of cross valve, adopts at present the device of this cross valve, often exists action not bery accurate; reliability is not very high problem, so that the shutdown maintenance increased frequency.

Claims

1, automatic diverter valve in a kind of compressed air purifier, by valve core piston (7), valve chest (9), piston rod (10), end cap (11), seal ring (12,13,20,21), gasket seal (14), flange (15) and stud bolt (16) are formed, it is characterized in that: valve chest (9) inside is valve pocket (8), side, valve chest middle part has an opening to communicate with suction tude (17), valve core piston (7) is fixed on the piston rod (10), respectively there is an end cap (11) that has center hole at valve pocket (8) two ends, piston rod (10) passes the center hole of two end caps (11) to be slidingly matched, all there is seal ring (12 in the place that piston rod (10) is passed on each end cap (11) center hole both sides, 13), respectively there is a flange (15) end cap (11) outside at valve pocket (8) two ends, between end cap (11) and the flange (15) gasket seal (14) is arranged also, the end cap at valve pocket two ends (11) tightens together by stud bolt (16) with flange (15), the center hole of the flange at two ends (15) connects steam outlet pipe (18) by pipe thread, between valve chest (9) end face and end cap (11) surface of contact, and between piston (7) and end cap (11) surface of contact, seal ring (20,21) is also arranged.