CN1167224A - Valve device and air leakage detector - Google Patents
Valve device and air leakage detector Download PDFInfo
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- CN1167224A CN1167224A CN 96107925 CN96107925A CN1167224A CN 1167224 A CN1167224 A CN 1167224A CN 96107925 CN96107925 CN 96107925 CN 96107925 A CN96107925 A CN 96107925A CN 1167224 A CN1167224 A CN 1167224A
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Abstract
The present invention provides a valve device without heating fluid and air leak detector using said valve device. Said air leak detector includes valves used for opening and closing test object, volume changer used for obtaining volume information of related test object, driving device with motor used for driving valves and volume changer and making them act, rotary driving shaft driven by motor and cams mounted on the driving shaft. The valves respectively possess valve body and plunger received in the valve body. and one end of the plunger is projected from the valve body, and the projected end of said plunger is equipped with cam driven part opposite from cam.
Description
The present invention relates to a kind of valving and use the air leakage detector of this valving.
The existing valve that drives without manually-operable has known solenoid valve.
Yet, for above-mentioned solenoid valve, when electric current is flowed through solenoid, the solenoid heating, this heat is passed to fluid, therefore, in occasions such as for example air leakage detectors, because hydrometry must be avoided the influence of heat, so should not adopt solenoid valve.
In order to address the above problem, first invention provides a kind of valving, it has valve and drives the drive unit of this valve, it is characterized in that: above-mentioned valve have the valve body that forms runner and be contained in this valve body and end from the plunger of the outstanding outside of valve body, by this plunger move axially the above-mentioned runner of may command, above-mentioned drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor and (iii) be located at above-mentioned transmission shaft, with the outstanding end concerted action of above-mentioned plunger driving valve cam with mobile plunger.
Second invention provides as first described valving of invention, it is characterized in that: a plurality of driving valve cams are set at interval at above-mentioned transmission shaft upper edge transmission shaft bearing of trend, a plurality of above-mentioned valves are along transmission shaft bearing of trend and row arrangement, and the outstanding end of the plunger of these valves is relative respectively with cam with above-mentioned a plurality of driving valves.
The 3rd invention provides as first or second described valving of invention, it is characterized in that: on above-mentioned transmission shaft, be provided with actuating component, relatively dispose rotational position detection device with this actuating component, this rotational position detection device detects it when actuating component reaches specific pivotal position, and output pivotal position testing signal.
The 4th invention provides a kind of air leakage detector, it has: an end is connected the other end for releasably connecting the gas channel of the connecting end of checking object with pressure source, be located at the valve on this gas channel, and the pressure transducer that is connected in gas channel between this valve and the above-mentioned connecting end; It is characterized in that: above-mentioned valve has the valve body that forms runner and is contained in this valve body and end is projected into the plunger of outside from valve body, move axially the above-mentioned runner of may command by this plunger, also be provided with drive unit, this drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor and (iii) be located at above-mentioned transmission shaft, along with transmission shaft rotates and the driving valve cam of the outstanding end concerted action of plunger with mobile plunger.
The 5th invention provides a kind of air leakage detector, it has: an end is connected the other end for releasably connecting the gas channel of the connecting end of checking object with pressure source, be located at the valve on this gas channel, the capacity that connects gas channel between this valve and the above-mentioned connecting end changes device and pressure transducer; It is characterized in that: above-mentioned capacity change utensil has with the channel attached cylinder of above-mentioned gas and is contained in this cylinder and the plunger that outwards give prominence to from cylinder the end, the volume that changes above-mentioned cylinder that moves axially by this plunger, also be provided with drive unit, this drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor, (iii) be located at above-mentioned transmission shaft, change the device cam along with transmission shaft rotates with the outstanding end concerted action of plunger with the driving capacity of mobile plunger.
The 6th invention provides a kind of air leakage detector, it has: an end is connected the other end for releasably connecting the gas channel of the connecting end of checking object with pressure source, be located at the valve on this gas channel, the capacity that connects gas channel between this valve and the above-mentioned connecting end changes device and pressure transducer; It is characterized in that: above-mentioned capacity change utensil has with the channel attached cylinder of above-mentioned gas and is contained in this cylinder and the plunger that outwards give prominence to from cylinder the end, the volume that changes above-mentioned cylinder that moves axially by this plunger, above-mentioned valve has the valve body that forms runner and is contained in this valve body and the plunger that outwards give prominence to from valve body the end, move axially the above-mentioned runner of may command by this plunger, also be provided with drive unit, this drive unit has (i) motor, the (ii) transmission shaft that rotates by above-mentioned motor, (iii) be located at this transmission shaft, the outstanding end concerted action that changes device plunger and valve piston with above-mentioned capacity changes device with cam and driving valve cam with the driving capacity that moves these plungers respectively.
According to first invention, by by the motoring cam rotation, removable plunger, thereby the runner of control valve body.Owing to do not use solenoid during control valve, thereby can be to the fluid heat transferring of the runner of flowing through.
Therefore according to second invention,, can make synchronously or the in accordance with regulations phase bit motion of angle of a plurality of valves exactly by a plurality of cam rotation of above-mentioned motoring.
According to the 3rd invention, owing to be provided with the actuating component that is used for rotational position detection device on the transmission shaft of above-mentioned cam being provided with, therefore can detect the pivotal position of cam, and it is also fairly simple to be used for the structure of this purpose.
According to the 4th invention, because along with the action of valve does not produce heat, thereby can correctly measure variation in pressure, and then can improve the precision of air leak detection.
According to the 5th invention, connecting under the state of checking object and throttle down, comprise when checking the capacity of object in interior locking system when making the capacity that connects gas channel change the device action and changing, the variation in pressure that this volume change is brought can be detected by the pressure transducer that connects gas channel.This variation in pressure has comprised the volume information of checking object.Therefore, according to such as this variation in pressure and the variation in pressure when detected pressures being provided and closing gas channel, can detect the leakage rate of detected object.As mentioned above, by electric motor driven cam-actuated, therefore, the occasion that changes device with the manually-operable capacity is compared good operability to the capacity of use change device, and is simple with the occasion structure compared that adopts other transmission system to activate with valve.
According to the 6th invention, connecting under the state of checking object and throttle down, comprise when checking the capacity of object in interior locking system when making the capacity that connects gas channel change the device action and changing, the variation in pressure that this volume change is brought can be detected by the pressure transducer that connects gas channel.This variation in pressure has comprised the volume information of checking object.Therefore, according to such as this variation in pressure and the variation in pressure when detected pressures being provided and closing gas channel, can detect the remittance leakage quantity of detected object.As mentioned above, by electric motor driven cam-actuated, therefore, the occasion that changes device with the manually-operable capacity is compared good operability to the capacity of use change device, and is simple with the occasion structure compared that adopts other transmission system to activate with valve.In addition, also can obtain valve and capacity exactly and change device action phase difference constantly.Also have, do not generate heat during owing to valve event, thereby can correctly measure variation in pressure, and then improve the precision of air leak detection.
To elaborate to invention with reference to the accompanying drawings below.Wherein, Fig. 1 is the planimetric map of the present invention the 1st embodiment's air leakage detector pith; Fig. 2 is the system diagram of above-mentioned air leakage detector; Fig. 3 (A)～(E) illustrates the primary position of the cam that is used for above-mentioned air leakage detector; Fig. 4 is the amplification longitudinal section of Twoway valves in the above-mentioned air leakage detector; The capacity that Fig. 5 illustrates in the above-mentioned air leakage detector changes device, and Fig. 5 (A) is for amplifying longitudinal section, and Fig. 5 (B) is an enlarged side view; Fig. 6 is the planimetric map of the present invention the 2nd embodiment's air leakage detector pith; Fig. 7 is the system diagram of the 2nd embodiment's air leakage detector; Fig. 8 is the amplification longitudinal section that is used for the 2nd embodiment's three-way valve; Fig. 9 illustrates the primary position of the cam that is used for this three-way valve.
In the accompanying drawings, label 1 is a gas channel, label 5a, 5b is Twoway valves (valve), and label 7 is differential pressure transducer (pressure transducer), and label 8 changes device for capacity, label 9 is three-way valve (valve), label 20 is a drive unit, and label 21 is a motor, and label 22 is a transmission shaft, label 31,32,33 is cam (actuating component), label 35,39 for driving the valve cam, and label 38 changes device cam, label 45 for the driving capacity, 48,49 is cam follower, label 50 is a valve body, label 54 is a plunger, and label 54a is outstanding end, and label 80 is a cylinder, label 81 is a plunger, label 81a is outstanding end, and label 90 is a valve body, and label 95 is a plunger, label 95a is outstanding end, label SW
1, SW
2, SW
3Be limit switch (rotational position detection device).
Below, with reference to Fig. 1～Fig. 5 the 1st embodiment of the present invention is elaborated.At first, with reference to Fig. 2 air leakage detector is described summarily.Air leakage detector has gas channel 1.Gas channel 1 has shared pathway 1X and by a pair of branched bottom 1a, the 1b of this shared pathway 1X branch.Connect source of compressed air 2 (pressure source) at the upper reaches of shared pathway 1X end.Downstream (connecting end) at branched bottom 1a connects benchmark container R, and this benchmark container can load and unload, and has confirmed not leak.Connect at the dirty end (connecting end) of branched bottom 1b and to check object W, this inspection object can load and unload, and will judge and have or not leakage.
On above-mentioned shared pathway 1X, begin to set gradually regulator 3, three-way solenoid valve 4 from upstream side.In addition, Twoway valves 5a, 5b are set respectively on branched bottom 1a, 1b.
Leading between the dirty end of 1a, 1b in Twoway valves 5a, 5b and branch on above-mentioned branched bottom 1a, the 1b, an end that connects a pair of Pressure testing passage 6a, 6b respectively, the other end of this Pressure testing passage 6a, 6b are connected with a pair of input hole of differential pressure transducer 7 (pressure transducer) respectively.
In addition, on branched bottom 1b, connection capacity changes device 8 between the dirty end of above-mentioned Twoway valves 5b and branched bottom 1b.
Air leakage detector also has control device 10.This control device 10 comprises microcomputer, input/output interface and drives the loop.The following limit switch SW of input in the control device 10
2, SW
2, SW
3The testing signal of (rotational position detection device), and also import the testing signal of differential pressure transducer 7.This control device 10 carries out the control of three-way solenoid valve, and the control of motor 21 in the aftermentioned drive unit 20 reaches the control of display device 11, qualified lamp 12, defective lamp 13.
As Fig. 1, above-mentioned Twoway valves 5a, 5b and capacity change device 8, are driven by common drive unit 20.
In detail, this drive unit 20 has motor 21 that is arranged on the base 15 and the transmission shaft 22 that is rotated by this motor 21.The two end part of transmission shaft 22 are supported by the pair of bearings 23 of being located at base 15, and are connected to the output shaft 21a of motor 21 by a pair of gear 24.
As Fig. 3 (A)～(E), cam 31,32,33,35,38 is a circular plate shape.Have otch 31a, 32a, the 33a that forms at small angle range respectively as Fig. 3 (A)～(C) cam 31,32,33.The angular orientation of these otch 31a, 32a, 33a is different mutually, and otch 31a and otch 32a upwards leave θ in week
1(for example 35 °), otch 31a and otch 33a upwards leave θ in week
2(for example 180 °).As Fig. 3 (D), cam 35 has the otch 35a that forms in bigger angular range.As Fig. 3 (E), cam 38 is an eccentric cam.
On base 15, be arranged side by side limit switch SW along transmission shaft 22 bearing of trends
1, SW
2, SW
3, Twoway valves 5a, 5b, and capacity changes device 8.Limit switch SW
1, SW
2, SW
3Action piece 41,42,43 relative with above-mentioned cam 31,32,33 respectively as cam follower.In addition, the roller shape cam follower 45 relative with above-mentioned cam 35 is installed on Twoway valves 5a, 5b, changes at capacity the roller shape cam follower 48 relative with cam 38 is installed on the device 8.
The detailed structure of above-mentioned Twoway valves 5a, 5b then, is described with reference to Fig. 1, Fig. 4.Twoway valves has the vertical valve body 50 of axle center and above-mentioned transmission shaft 22.The obstruction component 52 that this valve body 50 has barrel member 51 and an end opening of this barrel member 51 is stopped up forms holding space 53 by the two.Barrel member 51 has and runs through its perisporium input hole 51a of opening in the above.Obstruction component 52 has the delivery outlet 52a of opening in the above, the valve seat 52b relative with above-mentioned holding space 53, and intercommunicating pore 52c from delivery outlet 52a to the valve seat 52b opening the other end that link to each other with of an end.These input holes 51a, holding space 53, intercommunicating pore 52c and delivery outlet 52a constitute the runner of Twoway valves 5a, 5b.
The input hole 51a of Twoway valves 5a and delivery outlet 52a are connected in the branched bottom 1a of gas channel 1, and input hole 51a and the delivery outlet 52a of Twoway valves 5b are connected in branched bottom 1b.
In the holding space 53 of above-mentioned valve body 50, can be vertically (promptly vertical direction) with transmission shaft 22 accommodate cylindrical plunger 54 slidably.An end 54a of above-mentioned plunger 54 is projected into the outside from the opening end of barrel member 51, forms groove 54b on this outstanding end 54a, holds above-mentioned cam follower 45 in this groove 54b.Cam follower 45 is by connecting the pin 45a rotatably support of outstanding end 54a.Stop pin 44 connects the end of being fixed in barrel member 51, by sell among the 55 insertion groove 54b, can stop plunger 54 rotations, simultaneously by making pin 55 withstand the inner end of groove 54b, can prevent that plunger 54 from extracting.
At the coaxial tubular carriage 56 that is fixed with of the inner end of above-mentioned plunger 54.Form radially on the top of this carriage 56, along the outstanding retainer 56a of internal direction.Hold being useful on the spring 57 and spool 58 that absorbs impact in carriage 56, spool 58 is by spring 57 pushings, and the circular step that is formed at these spool 58 peripheries withstands on the retainer 56a of above-mentioned carriage 56.Tip portion at this state lower valve core 58 is outstanding relative with above-mentioned valve seat 52b from the top of carriage 56.Carriage 56 and plunger 54 by Returnning spring 59 along left among Fig. 4 to pushing, thereby spool 58 is lifted from valve seat 52b.
Change the detailed structure of device 8 below with reference to Fig. 1, Fig. 5 explanation capacity.Capacity changes device 8 and has cylinder 80 and plunger 81, and this cylinder 80 extends and end sealing along the direction vertical with above-mentioned transmission shaft 22, this plunger 81 be contained among the holding space 80a of this cylinder 80 and can be vertically (direction vertical) with transmission shaft 22 slide.In cylinder 80, form link to each other with the above-mentioned holding space 80a intercommunicating pore 80b of the other end opening above cylinder 80 of an end.This intercommunicating pore 80b links to each other with the branched bottom 1b of above-mentioned gas passage 1.
An end of above-mentioned plunger 81 is projected into the outside from cylinder 80, passes through pin 48a rotatably support cam follower 48 at this protruding terminus 81a.Be fixed with stop pin 82 at this outstanding end 81a near the perforation of cam follower 48 places.By the spring seat 83 of stop pin 82 stop and be formed between the ring-shaped step 80c of cylinder 80 peripheries and establish Returnning spring 84, this Returnning spring 84 with plunger 81 towards from the outstanding directions pushing of cylinder 80.On cylinder 80, be fixed with the horizontal part 85a of L font carriage 85.The vertical component effect 85b of this carriage 85 is divided into two bursts of two end part of blocking above-mentioned stop pin 82.Prevent that thus plunger 81 from coming off.
Next the effect of the leak detector of said structure is described.Under A-stage shown in Figure 2, three-way solenoid valve 4 is in and the atmosphere on-state branched bottom 1a, 1b, and Twoway valves 5a, 5b open, and plunger 81 outward directions of capacity change device 8 are outstanding to make it have maximum volume.Describe this A-stage below in detail.
In above-mentioned A-stage, the cam 31,32,33,35,38 of drive unit 20 is in pivotal position shown in Figure 3.In detail, the otch 31a and the switch SW of cam 31
1 Action piece 41 relative because this action piece 41 enters among the otch 31a, so switch SW
1Become on-state (output state of the 1st pivotal position testing signal).Otch 32a, the 33a of cam 32,33 not with switch SW
2, SW
3Action piece 42,43 relative, these action pieces 42,43 withstand on the side face of cam 32,33 and are in going-back position, thereby switch SW
2, SW
3Do not export the pivotal position testing signal.
Under above-mentioned A-stage, the otch 35a of cam 35 is relative with cam follower 45, and this cam follower 45 is held wherein.Therefore, as shown in Figure 4, the plunger 54 of Twoway valves 5a, 5b is in extrusion position and by stop pin 55 stop, spool 58 lifts from valve seat 52b.Its result, input hole 51a is communicated with delivery outlet 52a, and Twoway valves 5a, 5b become open mode.
Under above-mentioned A-stage, the side face of cam 38 from cam follower 48 farthest.Therefore, as shown in Figure 5, plunger 81 is in the vertical component effect 85b stop by carriage 85 of extrusion position and stop pin 82.Its result, it is maximum that the volume of holding space 80a becomes.
The situation (hereinafter referred to as first leak detection pattern) of the not clear inspection object of volume being done first leak detection at first is described.
After will checking object W under the above-mentioned A-stage and gas channel 1 is connected, one presses not shown starting button, and 10 pairs of signals from this starting button of control device respond and begin leak detection.That is, make three-way solenoid valve 4 still be in closed condition, drive transmission shaft 22 by motor 21 and rotate along the direction of arrow among Fig. 3.Along with the rotation of this transmission shaft 22, the plane of inclination of the otch 35a of cam 35 abuts against and pushes this cam follower 45 on the cam follower 45.Like this, the plunger 54 resistance springs 59 of Twoway valves 5a, 5b move to the dextrad of Fig. 4, and spool 58 is followed this plunger 51 near valve seat 52b.Spool 58 is sitting on the valve seat 52b for a moment, and Twoway valves 5a, 5b close.
After above-mentioned Twoway valves 5a, 5b had just closed, transmission shaft 22 arrived θ from the rotation angle of primary position
1, the otch 32a and the switch SW of cam 32
2 Action piece 42 relative.Its result, action piece 42 outstanding otch 32a, the switch SW of entering
2Connect (the 2nd pivotal position testing signal output).Control device 10 these connection signals of response temporarily stop motor 21.
Because Twoway valves 5a, 5b close as described above, benchmark container R and inspection object W cut off with barometric pressure respectively.The pressure surge that this Twoway valves 5a, 5b closing motion produce finishes during temporarily stopping motor 21.Control device 10 reads pressure P from differential pressure transducer 7 when pressure stability
A(equaling barometric pressure substantially).
The rotation angle of transmission shaft 22 reaches θ
2The time, the otch 33a of cam 33 arrives and switch SW
3The relative position of action piece 43.Its result, the action piece 43 outstanding otch 33a that enter into connect switch SW
3(the 3rd pivotal position testing signal output).Control device 10 these connection signals of response are suspended the stipulated time with motor 21 again.
Change device 8 by driving capacity as described above, to comprise a certain amount of γ C of volume reducing (capacity changes the poor of the maximum volume of device 8 and minimum volume) that capacity changes device 8, branched bottom 1b and checks the locking system of object W, after stopping motor and making pressure stability, control device 10 reads pressure P after capacity reduces from differential pressure transducer 7
A'.Variation in pressure Δ P before and after reducing by control device 10 calculated capacities then
A=P
A'-P
AThis variation in pressure Δ P
AThe information that comprises the volume V of 3 inspection object W.Because according to Boyle's law, variation in pressure Δ P
ACan express by following formula:
ΔP
A＝P
A·(V
C/V) …(1)
After above-mentioned motor 21 stops, starting motor 21 again.Soon, switch SW
1Action piece 41 enter among the otch 31a of cam 31 these switch SW of control device 10 response again
1Connection signal, motor 21 is stopped.Its result, cam 31,32,33,35,38 turns back to primary position, and Twoway valves 5a, 5b and capacity change device 8 and also turn back to A-stage.
Above-mentioned stopping, control device 10 through after the stipulated time open three-way solenoid valve 4 by regulator 3 with detected pressures P
TSupply with benchmark container R and check object W.By during substantially identical therewith or start motor 31 in any slightly late, make transmission shaft 22 turn to θ
1, close Twoway valves 5a, 5b, thereby keep detected pressures P
TConstant and close benchmark container R and check object W.And rotation angle reaches θ
1The time responding to switch SW
2Connection signal, stop motor 21, under this state, hunt leak.That is, read benchmark container R and the pressure differential deltap P that checks object W from differential pressure transducer 7
TBecause benchmark container R does not leak, so as checking that object W has leakage, then along with the elongated pressure differential deltap P of elapsed time
TAlso increase.Control device 10 is with pressure differential deltap P
TVariation in pressure Δ P with above-mentioned volume change generation
AInformation substitution following formula calculate the leakage rate that converts with barometric pressure, check object W:
V
L＝V
C·(ΔP
T/ΔP
A) …(2)
As mentioned above, since Twoway valves 5a, 5b when action without solenoid, but adopt cam mechanism, so do not produce heat during action, can prevent the pressure surge that this heat causes, thereby can correctly measure leakage rate, and then can make correct judgement checking object according to above-mentioned (2) formula.
After above-mentioned leak detection finished, control device started motor 21 from rotation angle θ
1One gas turns back to A-stage, and closes three-way solenoid valve 4 benchmark container R is connected with checking object W and atmosphere.
As mentioned above, in the occasion that is in first leak detection pattern, transmission shaft 22 rotates twice.
After with above-mentioned first leak detection pattern leak detection, will check that object W takes off from gas channel, new inspection object W in the connection.When the inspection object W of this inspection object W and front is same shape, enters and continue the leak detection pattern.Continue in the leak detection pattern at this, transmission shaft 22 only rotates once.Because the effect when this continues the 2nd rotation of leak detection pattern and first leak detection pattern lower drive shaft 22 is identical, so save detailed description.
Below, with reference to Fig. 6～Fig. 9 the 2nd embodiment of the present invention is described.As shown in Figure 7, the present embodiment three-way solenoid valve 4 that replaces the 1st embodiment by electric motor driven three-way valve 9.Other structure is identical, so adopt same numeral and save its detailed description.As Fig. 6, on transmission shaft 22, fix a cam 39 again, three-way valve 9 and two Twoway valves 5a, 5b and capacity change device 8 and row arrangement.At the protruding terminus 95a of three-way valve plunger 95 described later, the cam follower 49 relative with this cam 39 is set.As shown in Figure 9, on cam 39, form otch 39a.
As shown in Figure 8, this three-way valve 9 has the vertical valve body 90 of axle center and transmission shaft 22.This valve body 90 connects 4 members 91,92,93,94 along straight line.Member 91 is a cylindrical shape, accommodates tubular plunger 95 in its holding space 91a, and this plunger 95 can slide along the direction vertical with transmission shaft 22.An end of this plunger 95 is outwards outstanding from this member 91, accommodates cam follower 49 in being formed at the groove 95b of this outstanding end 95a, and this cam follower 49 is by pin 49a rotatably support.Plunger 95 is pushed to projected direction by spring 96.In addition, prevent the rotation of plunger 95 by the stop pin 97 of passing member 91 and come off.
On above-mentioned member 92,93,94, form gross blow hole 92a, delivery outlet 93a, input hole 94a respectively at opening above it.Delivery outlet 93a, input hole 94a are connected on the shared pathway 1X of gas channel 1 as shown in Figure 7.
Form holding space 92b, 94b at above-mentioned member 92,94, in these holding spaces 92b, 94b, accommodate spool 98,99.These spools 98,99 connect together by bar 100 and piston 95.This bar 100 inserts and is formed among pilot hole 92c, the 94c of member 92,94, can be supported slidably along the valve body axle center.At these bar 100 fixing above-mentioned spools 98,99.
Above-mentioned member 93 is formed with than pilot hole 92c, vent 93b that the 94c diameter is big, can be with above-mentioned bar 100 by wherein.This vent 93b links to each other with above-mentioned delivery outlet 93a.Two ends in vent 93b form valve seat 93x, 93y.
By above-mentioned three hole 92a, 93a, 94a, vent 93b, holding space 92b, 94b, the runner of formation three-way valve 9.
The holding space 94b of above-mentioned member 94 accommodates Returnning spring 101, by this Returnning spring 101 spool 99 is pushed to valve seat 93y, and spool 98 is pushed to the direction of lifting from valve seat 93x.
In the end of the bar 100 relative, can support a pair of spring seat 102,103 vertically slidably with above-mentioned holding space 91a.Mounting spring 104 between this spring seat 102,103.The slip of these spring seats 102,103 is subjected to the restriction of backstop 105,106.
Under the state, the cam follower 49 of three-way valve 9 enters among the otch 39a of cam 39 said structure as shown in Figure 9 in the early stage.Therefore, as shown in Figure 8, the plunger 95 of three-way valve 9 is outwards outstanding state, and spool 98 lifts from valve seat 93x, and spool 99 is sitting on the valve seat 93y.Its result, delivery outlet 93a and input hole 94a cut off, and 92a links to each other with gross blow hole, and benchmark container R and inspection object W and atmosphere are connected.
The following describes first leak detection pattern.Motor 21 is started in the connection of control device 10 response starting buttons, (compares θ with smaller rotation angle
1Little angle) cam follower 49 is deviate from from otch 39a, and plunger 95 is pushed in the valve body 90.So, the ring-shaped step 95c that is stopped at plunger 95 middle part inner faces withstands on the spring seat 102, by spring 104, spring seat 103 and backstop 106, bar 100 is moved along dextrad among Fig. 8.Like this, spool 98 is seated at valve seat 93x, and spool 99 lifts from valve seat 93y.Its result, delivery outlet 93a is communicated with input hole 94a, cuts off with gross blow hole 92a, thereby adds detected pressures to benchmark container R and inspection object W.
Rotation angle at transmission shaft 22 is about to reach θ
1Before, Twoway valves 5a, 5b close.Rotation angle reaches θ
1And after motor 21 suspends, start motor 21 once more and make capacity change device 8 actions.Thus, in the present embodiment, under the detected pressures state, make capacity change device 8 actions, obtain to comprise the volume information of inspection object W at interior pressure changing information.
When transmission shaft 22 rotates the 2nd time, transmission shaft is rotated and the same rotation angle θ of the 1st embodiment
1After, stop motor 21 and hunt leak.Calculate leakage rate according to the variation in pressure that this moment, detected pressure reduction and above-mentioned volume change caused then, judge whether the inspection object is qualified.Afterwards, start motor one gas and turn back to primary position.
Because the effect that continues when transmission shaft 22 rotates for the 2nd time in leak detection pattern and the first leak detection pattern is identical, the Therefore, omited detailed description.
The invention is not restricted to the foregoing description, various ways can be arranged.For example, increase the occasion of valve again at leak detector, available by common electric motor driven cam, make the valve event of these increases.
In leak detector, detected pressures is negative pressure also.
Rotational position detection device also has the optical sensor of luminescence part and light-receiving part.At this moment, be located at formation projection or window on the actuating member of transmission shaft, the light path between luminescence part and the light-receiving part is interdicted and be communicated with.
First invention utilizes electric motor driven cam mechanism, do not produce heat when making valve event, heat do not passed to fluid as controlling object.
Second invention can make synchronously or the in accordance with regulations phase bit motion of angle of a plurality of valves exactly.
The 3rd invention can detect the pivotal position of cam, and it is also fairly simple to be used for the structure of this purpose.
The 4th invention do not generated heat during owing to valve event, therefore can correctly measure variation in pressure, and then improves the precision of air leak detection.
The 5th invention used by electric motor driven cam-actuated with valve because capacity changes device, thereby changes the occasion good operability of device compared with the manually-operable capacity, compared with simple in structure with the occasion of other transmission system actuating.
The 6th invention used by electric motor driven cam-actuated with valve because capacity changes device, thereby changes the occasion good operability of device compared with the manually-operable capacity, compared with simple in structure with the occasion of other transmission system actuating.In addition, also can obtain valve and capacity exactly and change device action phase difference constantly.Also have, do not generate heat during owing to valve event, thereby can correctly measure variation in pressure, and then improve the precision of air leak detection.
Claims (6)
1. valving, it has valve and drives the drive unit of this valve, it is characterized in that: above-mentioned valve has the valve body that forms runner and is contained in this valve body and end is projected into the plunger of outside from valve body, by this plunger move axially the above-mentioned runner of may command, above-mentioned drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor and (iii) be located at above-mentioned transmission shaft, along with the outstanding end concerted action of the rotation of transmission shaft and above-mentioned plunger driving valve cam with mobile plunger.
2. valving as claimed in claim 1, it is characterized in that: a plurality of driving valve cams are set at interval at above-mentioned transmission shaft upper edge transmission shaft bearing of trend, a plurality of above-mentioned valves are along transmission shaft bearing of trend and row arrangement, and the outstanding end of the plunger of these valves is relative respectively with cam with above-mentioned a plurality of driving valves.
3. valving as claimed in claim 1 or 2, it is characterized in that: on above-mentioned transmission shaft, be provided with actuating component, relatively dispose rotational position detection device with this actuating component, this rotational position detection device detects it when actuating component reaches specific pivotal position, and output pivotal position testing signal.
4. air leakage detector, it has: an end is connected with pressure source, the other end is the gas channel that releasably connects the connecting end of checking object, is located at the valve on this gas channel, and the pressure transducer that is connected in gas channel between this valve and the above-mentioned connecting end; It is characterized in that: above-mentioned valve has the valve body that forms runner and is contained in this valve body and end is projected into the plunger of outside from valve body, move axially the above-mentioned runner of may command by this plunger, also be provided with drive unit, this drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor and (iii) be located at above-mentioned transmission shaft, along with transmission shaft rotates and the driving valve cam of the outstanding end concerted action of plunger with mobile plunger.
5. air leakage detector, it has: an end is connected the other end for releasably connecting the gas channel of the connecting end of checking object with pressure source, be located at the valve on this gas channel, the capacity that is connected in gas channel between this valve and the above-mentioned connecting end changes device and pressure transducer; It is characterized in that: above-mentioned capacity change utensil has with the channel attached cylinder of above-mentioned gas and is contained in this cylinder and the plunger that outwards give prominence to from cylinder the end, the volume that changes above-mentioned cylinder that moves axially by this plunger, also be provided with drive unit, this drive unit have (i) motor, the transmission shaft that (ii) rotates by above-mentioned motor, (iii) be located at above-mentioned transmission shaft, change the device cam along with transmission shaft rotates with the outstanding end concerted action of plunger with the driving capacity of mobile plunger.
6. air leakage detector, it has an end and is connected the other end with pressure source for releasably connecting the gas channel of the connecting end of checking object, be located at the valve on this gas channel, the capacity that is connected in gas channel between this valve and the above-mentioned connecting end changes device and pressure transducer; It is characterized in that: above-mentioned capacity changes utensil to be had and the channel attached cylinder of the above-mentioned gas plunger outwards outstanding with being contained in this cylinder, the volume that changes above-mentioned cylinder that moves axially by this plunger, above-mentioned valve has the valve body that forms runner and is contained in this valve body and the plunger that outwards give prominence to from valve body the end, move axially the above-mentioned runner of may command by this plunger, also be provided with drive unit, this drive unit has (i) motor, the (ii) transmission shaft that rotates by above-mentioned motor, (iii) be located at this transmission shaft, the outstanding end concerted action that changes device plunger and valve piston with above-mentioned capacity changes device with cam and driving valve cam with the driving capacity that moves these plungers respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107925 CN1167224A (en) | 1996-06-03 | 1996-06-03 | Valve device and air leakage detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96107925 CN1167224A (en) | 1996-06-03 | 1996-06-03 | Valve device and air leakage detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1167224A true CN1167224A (en) | 1997-12-10 |
Family
ID=5119831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96107925 Pending CN1167224A (en) | 1996-06-03 | 1996-06-03 | Valve device and air leakage detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1167224A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588666A (en) * | 2011-01-12 | 2012-07-18 | 宝山钢铁股份有限公司 | Cam type multi-gear valve position switcher |
| CN103343834A (en) * | 2013-06-13 | 2013-10-09 | 常熟市惠尔石化仪表有限公司 | Valve limiting switch with microswitches |
| CN110043525A (en) * | 2019-04-01 | 2019-07-23 | 山东交通职业学院 | Increment Type Digital Hydraulic hydraulic valve bank |
-
1996
- 1996-06-03 CN CN 96107925 patent/CN1167224A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588666A (en) * | 2011-01-12 | 2012-07-18 | 宝山钢铁股份有限公司 | Cam type multi-gear valve position switcher |
| CN102588666B (en) * | 2011-01-12 | 2014-04-30 | 宝山钢铁股份有限公司 | Cam type multi-gear valve position switcher |
| CN103343834A (en) * | 2013-06-13 | 2013-10-09 | 常熟市惠尔石化仪表有限公司 | Valve limiting switch with microswitches |
| CN110043525A (en) * | 2019-04-01 | 2019-07-23 | 山东交通职业学院 | Increment Type Digital Hydraulic hydraulic valve bank |
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