CN203585516U - Valve opening and closing mechanism used for mechanical timing valve - Google Patents
Valve opening and closing mechanism used for mechanical timing valve Download PDFInfo
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- CN203585516U CN203585516U CN201320625920.3U CN201320625920U CN203585516U CN 203585516 U CN203585516 U CN 203585516U CN 201320625920 U CN201320625920 U CN 201320625920U CN 203585516 U CN203585516 U CN 203585516U
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Abstract
The utility model belongs to the technical field of valves, and discloses a valve opening and closing mechanism used for a mechanical timing valve. The valve opening and closing mechanism is characterized by comprising a rotary shaft, a locking wheel in one-way linkage with the rotary shaft and a locking rod used for locking the locking wheel, wherein the rotary shaft is provided with a valve closing clockwork spring, the rotary shaft is connected with the locking wheel through a ratchet mechanism, the circumference of the locking wheel is provided with teeth, the first end of the locking rod is provided with clamping teeth, the second end of the locking rod abuts against the outer edge of a cam of a timer, the outer edge of the cam of the timer is composed of a section of an arc profile with a rotation center as a circle center and a section of a mutation profile, when the arc profile of the cam of the timer corresponds to the second end of the locking rod, the clamping teeth at the first end of the locking rod are embedded in a tooth groove of the locking wheel, and when the mutation profile of the cam of the timer corresponds to the second end of the locking rod, the second end of the locking rod moves along with the mutation profile, and the clamping teeth at the first end of the locking rod disengage from the tooth grove of the locking wheel. The valve opening and closing mechanism is compact and reasonable in structure and high in reliability, and facilitates reduction of the product size and product cost.
Description
Technical field
The utility model belongs to valve technology field, relates to and how to realize the technology that valve is regularly closed, and is mainly used in the valve of gas pipeline.
Background technique
Universal in domestic. applications of gaseous fuel, for people's life brings very big facility, but some problems also progressively display.The problem that people pay attention to is the most safety problem, and for many years, people are focusing on fuel leakage of taking precautions against, yet it is anti-existing to pay close attention to the accident that occurred for many years, mostly because of valve, forgets to close to cause.For this problem, the existing valve with timing function occurs in recent years, but adopts electronic timer more, but because of reasons such as price are inclined to one side, not being in, it is universal to use.And its disadvantage is that, when battery failure, timing function lost efficacy thereupon.For the user who easily forgets throttle down, require it to change battery on time, be obviously not easy to accomplish.As changed not in time battery, Timed valve wouldn't perform practically no function.
In addition, in electronic timer, reliability of electronic components is low, and easily damaging lost efficacy or be interfered makes mistakes, and electronic component is water funk.Therefore electronic type Timed valve reliability is very low.
Mechanical timer, mainly by timing mechanism and escapement speed-adjusting mechanism two-part, formed, timing mechanism is turned round as motive force drive main spindle by clockwork spring (calling timing clockwork spring in the following text), by cam, as trigger mechanism, trigger actuator moves when regularly finishing, general independent being assemblied on camshaft of cam, camshaft and main shaft be by gear transmission, the timer that is no more than a week for main shaft timing range, and cam also can directly be assemblied on main shaft.
Regularly handle is generally assemblied on main shaft, also has part timer separately to establish a regularly axle, regularly on axle, assembles regularly handle, and regularly axle and main shaft are by gear transmission.
Escapement speed-adjusting mechanism (the < < mechanical timing instrument > > that referring to University Of Tianjin Jing Yixi timing teaching and research room write identical with the structural principle of clock and watch, Tianjin science tech publishing house, Tianjin, 1980.The < < watch structure principle > > that Chen Changshan writes, Shanghai science tech publishing house, Shanghai, 1980), by balance spring mechanism, produced the swing of fixed frequency, by escapement lever, swing is passed to escape wheel, (the every swing of escapement once by two of escapement lever end forks watt or cylindrical pins alternating action, to control the rotating speed of escape wheel, escape wheel rotates the angle of a tooth), the rotation of escape wheel is passed through gear set drive by the terminal flywheel of regulating mechanism.Terminal flywheel coordinates by ratchet mechanism (interior engagement type ratchet mechanism) with main shaft, during main shaft gyration both interlock (ratchet and ratchet engagement), escapement lever to the control final body of escape wheel now in the control of main shaft gyration rotating speed.By handle, to clockwork spring, hold force direction rotary main shaft, main shaft band moving cam leaves phase-triggered.Decontrol handle, regularly start.Clockwork spring drive main spindle is slowly revolution under escapement speed-adjusting mechanism restriction, until cam revert to phase-triggered, regularly finishes, and actuator is by cam trigger action.
Timer cam common are two kinds, and a kind of is the common disc cams of circumference band lug boss, and a kind of is with the disc structure of recess on circumference.The first is by protruding pushing executing mechanism execution, and cam is directly as the power source performing an action, and is generally used for the Driving force that actuator needs less, and actuator moves simple occasion, as triggered touch switch.The second is to remove the restriction to actuator by recess, by actuator's execution voluntarily, be generally used for actuator and complete the required power of execution greatly or the more complicated occasion that performs an action, as the cam of the timing mechanism of alarm clock is on circumference the disc structure with recess, the effect of recess is to remove the swing restriction to alarm clock percussion hammer.
If mechanical timer is applied to be made into mechanical type timing valve on valve, a key problem is how to realize by timer and opens or closes valve.The current existing valve for the employing mechanical timer on gas pipeline on the market, in valve switch actuating mechanism, the power of throttle down is provided by timer cam, shortcoming both ways is mainly deposited in this design, on the one hand, because the needed power of switch valve is larger, ball valve especially.For timer cam can provide enough large power throttle down, need to configure the clockwork spring that torsion is very large for timer, but the torsion that clockwork spring is very large is only employed at the of short duration a moment regularly finishing, compare with the throttle down time several thousand times of durations (with 0.5 second throttle down used time, regularly within 60 minutes, calculate, timing course is 7200 times of throttle down) in timing course, the large torsion of clockwork spring is utterly useless.More crucial, the large torsion of clockwork spring has brought larger burden to the gear train of escapement speed-adjusting mechanism, easily causes damaging.In addition, in the process of close port, the gear drive between timer cam and main shaft also needs to bear larger pressure, not only its requirement of strength is increased, and also easily damages.On the other hand, the profile mutation distance of timer cam is limited, is generally difficult to meet the required operating distance of throttle down, also need to adopt the driving mechanism transmission such as lever to amplify, but the use of lever will increase the size of product greatly.
Summary of the invention
The utility model object is, based on above-mentioned prior art, proposes the better valve switch mechanism for mechanical type timing valve of high durability of a kind of compact structure reliability.
The technological scheme adopting is: a kind of valve switch mechanism for mechanical type timing valve, comprise that one opens or closes the rotating shaft of valve by forward and reverse, locking wheel with rotating shaft single-way linkage, for locking the locking bar of locking wheel, in described rotating shaft, be provided with the pass valve clockwork spring for drive shaft reversion, what close valve clockwork spring unloads the sense of rotation that force direction is rotating shaft throttle down (clockwork spring being held to power when valve is opened in rotating shaft), described rotating shaft is connected by ratchet mechanism with locking wheel, ratchet mechanism engagement during rotating shaft reversion, on described locking wheel circumference, establish tooth, described locking bar first end is provided with latch, the second end is resisted against in the outer rim of timer cam, the arc profile that the outer cause of timer cam one Duan Yifangzhuan center is the center of circle and one section of sudden change profile form, when corresponding locking bar the second end of the arc profile of timer cam, the latch of locking bar first end is embedded in the teeth groove of locking wheel, when sudden change contour correspondence locking bar second end of timer cam, locking bar the second end is with sudden change contour motion, the latch of locking bar first end is deviate from the teeth groove of locking wheel.
The utility model is closed clockwork as the power source of automatic-closing valve then by separately establishing to be exclusively used in, the power resources of valve closing action do not rely on timer cam, in the utility model, timer cam is one to be triggered or limiting part, need very little rotatory force, therefore timer can be selected the clockwork spring that torsion is less, all very friendly to the driving gear of the gear train of timer escapement speed-adjusting mechanism and timing mechanism.Be very beneficial for reducing timer departmental cost.And, to compare with existing machinery formula Timed valve, Timed valve overall structure is also compacter, is very beneficial for reducing product size.The utility model coordinates latch-type lockable mechanism restriction rotating shaft to reverse by ratchet mechanism, reaches the object that maintains valve open state, has the effect that art is good for strength, and the displacement distance of moving part only limits to the tooth depth of latch, and structure is very compact.
In the utility model such scheme, the linkage structure between described locking wheel and rotating shaft can have various forms.Described locking wheel can directly be assemblied in rotating shaft by ratchet mechanism, and locking wheel is connected with ratchet or the ratchet of ratchet mechanism respectively with rotating shaft.Also locking wheel can be assemblied on other axle, locking wheel passes through gear mechanism transmission with rotating shaft.Ratchet mechanism can be arranged in rotating shaft, also can be arranged in the installation shaft of locking wheel.Exemplify several concrete linkage structures below:
Described locking wheel can be directly and the coaxial ratchet of ratchet mechanism be fixed together, or be connected by a pair of carrier gear with the ratchet of ratchet mechanism.The ratchet of ratchet mechanism is arranged in described rotating shaft, and the hook tooth face tilt direction of ratchet mechanism is identical with rotating shaft forward direction.
Or described locking wheel is fixed together with the coaxial ratchet of ratchet mechanism, but the ratchet of ratchet mechanism is not arranged in described rotating shaft, and is arranged on a bridge shaft, and bridge shaft is connected with rotating shaft by a pair of gear.
Again or, it is upper that the ratchet of ratchet mechanism is hinged on described locking wheel, locking wheel arranges with the coaxial ratchet heart of ratchet mechanism; The ratchet of ratchet mechanism and described rotating shaft are fixed, or are connected by gear mechanism with rotating shaft.
Again or, the ratchet of ratchet mechanism is hinged on the gear with rotating shaft concentric, this gear is sleeved in rotating shaft rotationally, the ratchet of ratchet mechanism and rotating shaft be fixing assembling coaxially.Locking wheel is direct geared and the gear engagement that ratchet is set, or together with locking wheel is coaxially fixedly installed with another gear, another gear meshes with the gear that ratchet is set.
Consider for the torsion of the clockwork spring of throttle down larger, as rotating shaft directly passes to moment of torsion locking wheel, latch acts in locking wheel teeth stressed larger, easily damage, therefore, the utility model proposes a kind of preferred structure: between rotating shaft and locking wheel, be provided with large and small two intermeshing carrier gears, the gearwheel of wherein passing a bridge is assemblied in rotating shaft by ratchet mechanism, gap bridge small gear is taken turns coaxially with locking and circumferential relative being fixedly installed.
More specifically, ratchet mechanism is outer gearing formula ratchet mechanism, and ratchet and rotating shaft are fixed, and gap bridge gearwheel is sleeved in rotating shaft rotationally, and the hinged or one end of ratchet is fixed on gearwheel; Or ratchet mechanism is interior engagement type ratchet mechanism, gap bridge gearwheel is relative with the coaxial ratchet heart to be fixedly installed, and ratchet is circumferentially arranged in rotating shaft regularly; For the second structure, gearwheel and ratchet can unite two into one, and gearwheel is loop configuration, and outer rim is gear structure, and inner circle is ratchet structure.
In the utility model, the identical or different timer cam structure of described locking bar, can have several differences that structure is set, and substantially can arrange two kinds for moving setting and swing.
For example, locking bar moves setting, the preferred straight-bar structure of locking bar, and latch is located at first end end face, and latch embeds in the teeth groove of locking wheel, and restriction locking wheel rotates, and further, rotating shaft reversion is also limited.The flank of tooth of locking wheel and the flank of tooth of latch interact, and locking bar is produced to an active force that points to the second end.Timer cam is on circumference, to be with jagged disc structure.When recess turns to corresponding locking bar the second end, under the locking wheel flank of tooth and the interaction of the latch flank of tooth, locking bar the second end moves into recess, and first end latch is deviate from the teeth groove of locking wheel, locking bar lost efficacy to the limit rotation of locking wheel, and rotating shaft reversion restriction is disengaged.
For another example, locking bar swings and arranges, and locking bar can be straight-bar or warp architecture, and latch is located at first end side, and latch embeds in the teeth groove of locking wheel, and restriction locking wheel rotates, and further, rotating shaft reversion is also limited.The flank of tooth of locking wheel interacts with the flank of tooth of latch, the moment of torsion to one of locking bar generation with latch opposite direction.Locking bar the second end is provided with the structure that pin structure or flange etc. protrude to side, and pin or flange side are resisted against in timer cam outer rim, and timer cam is on circumference, to be with jagged disc structure.When timer cam turns to its recess alignment finger or flange, locking bar the second end swings to timer cam center of circle direction, and first end latch is deviate from the teeth groove of locking wheel.Restriction to locking wheel is cancelled, and rotating shaft is reversed under clockwork spring effect, throttle down.
Consider that movement arranges locking bar and need limit locking wheel, locking bar, timer cam three on a line, three position side system has been formed to restriction, be unfavorable for timer construction design, so relatively preferably locking bar swing setting of the utility model, a kind of concrete scheme is: described locking bar swings and arranges.Latch arranges forward (clockwise direction or the counter clockwise direction) side of first end, locking bar the second end is resisted against in timer cam outer rim, timer cam is on circumference, to be with jagged disc structure, timer cam is positioned at the reverse (with the opposite direction of latch with respect to first end of locking bar the second end, counter clockwise direction or clockwise direction) side, when corresponding locking bar the second end of the recess of timer cam, locking bar the second end swings to timer cam center, and the latch of locking bar first end is deviate from the teeth groove of locking wheel.
Timer cam also can be selected on circumference with protruding conventional disc cams, adopt this kind of cam structure, projection is deviate from the structure of locking wheel teeth groove for pushing away locking bar first end latch, cam wheel is to promote locking bar to the direction away from the center of circle, therefore, locking wheel arc profile does not play substantial role to locking bar.Be required to be locking bar setting and maintain the mechanism that its first end latch is embedded in the state in locking wheel teeth groove, as established, promote the spring mechanism that locking bar first end relies on locking wheel.Compare the structure relative complex of lockable mechanism with the disc structure with recess.
As a kind of improvement, in order to make construction of switch compacter on the whole, can concentric setting by timer cam and rotating shaft, for example, and timer cam installation shaft center band through hole, rotating shaft is passed by through hole, and rotating shaft side and through hole are slidably matched.In addition, also timer cam installation shaft can be set, but timer cam is sleeved in rotating shaft rotationally, gear for timer cam and timer spindle transmission is sleeved on rotating shaft equally rotationally, by pin feature, itself and timer cam are fixed, or at least relatively fixing in sense of rotation.While adopting the timer cam installation shaft installation timer cam of hollow structure, in order to guarantee the reliable synchronization of timer cam and synchromesh gear, to guarantee accuracy regularly, also can adopt pin feature that both are fixed.
Scheme described in the utility model goes for valve rod rotary type valve, and as ball valve, stop valve etc., also go for the valve of valve rod movable type, as membrane valve.
When for ball valve, described rotating shaft can be valve rod itself, also can assemble with the interlock of valve rod coaxial synchronous, can also by gear drive, be connected with valve rod.
In the utility model, the effect of closing valve clockwork spring is in order to close valve valve.Therefore,, when rotating shaft is not the valve rod of ball valve itself, as a kind of equivalent substitution mode of the present utility model, described pass valve clockwork spring can be assemblied on valve rod.
When for spool movable valve, described rotating shaft and the valve rod connecting rod of push-and-pull barrier film (or for) can connect by linkage mechanism (as slidercrank mechanism), cam mechanism, rack and pinion drive mechanism.
In the utility model, manually reverse handle, make main shaft hold to clockwork spring the process that force direction rotates to set timing length, be called regularly, to decontrol after handle, clockwork spring starts to discharge potential energy, drives the process of each parts action, is called timing.The forward that specification is mentioned, refers to the sense of rotation of each parts in timing process, comprises the sense of rotation of opening valve; Reversion, refers to the sense of rotation of each parts in timing course, comprises the sense of rotation of throttle down.Revolution, refer to parts and last time direction of rotation rotation.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of mechanism type timing ball valve based on scheme described in the utility model.
Fig. 2 be in Fig. 1 A-A to sectional view.
Fig. 3 is under initial state, the annexation schematic diagram between tooth sector and timer spindle.
Fig. 4 is in timing process, opens valve eve, the annexation schematic diagram between tooth sector and timer spindle.
Fig. 5 is in timing process, after valve open, and the annexation schematic diagram between tooth sector and timer spindle.
Fig. 6 is in timing course, after tooth sector reversion dislocation, and the annexation schematic diagram between tooth sector and timer spindle.
Fig. 7 is after timing finishes, after valve closing, and the annexation schematic diagram between tooth sector and timer spindle.
Fig. 8 is under initial state, the annexation schematic diagram between timer cam and timer spindle.
Fig. 9 is in timing process, the annexation schematic diagram between timer cam and timer spindle.
Figure 10 is in timing process, the annexation schematic diagram between timer cam and timer spindle.
Figure 11 is in timing course, the annexation schematic diagram between timer cam and timer spindle.
Figure 12 is after timing finishes, the annexation schematic diagram between timer cam and timer spindle.
Figure 13 is under initial state, the drive connection schematic diagram between timer cam and locking wheel, locking bar.
Figure 14 is in timing process, the drive connection schematic diagram between timer cam and locking wheel, locking bar.
Figure 15 is in timing process, the drive connection schematic diagram between timer cam and locking wheel, locking bar.
Figure 16 is in timing course, the drive connection schematic diagram between timer cam and locking wheel, locking bar.
Figure 17 is after timing finishes, the drive connection schematic diagram between timer cam and locking wheel, locking bar, and this figure is the inside swing state of locking bar.
Figure 18 is after timing finishes, the drive connection schematic diagram between timer cam and locking wheel, locking bar, and this figure is the outside swing state of locking bar.
The locking wheel that Figure 19 is reversion limting mechanism and the linkage structure schematic diagram of rotating shaft.
Embodiment
Below in conjunction with accompanying drawing, the mechanical type timing ball valve that adopts valve switch described in the utility model mechanism of take is described further the know-why of technological scheme described in the utility model and effect thereof as example.
With reference to Fig. 1-19, this picture group is disclosed be can alarm after a kind of timing finishes mechanical type timing ball valve, wherein, Fig. 3-7 are tooth sector and rotating shaft drive connection under five states of a-e in timing, timing course, Fig. 8-12 are depicted as timer cam and timer spindle drive connection under five states of a-e in timing, timing course, and Figure 13-18 are depicted as timer cam and locking wheel drive connection under five states of a-e in timing, timing course.
Diagram mechanical type timing ball valve comprises mechanical timer and ball valve two large divisions, the escapement speed-adjusting mechanism (not shown) of mechanism type timer can adopt the relatively simple common pin pallet escapement speed governing of structure, comprise balance spring mechanism, escapement lever, escape wheel, gear train, flywheel forms, escapement is provided with pendulum nail, escapement lever swings and arranges, jaw has the fork pockets coordinating with pendulum nail, escapement is followed closely with the matching relationship of fork pockets and is driven escapement lever reciprocally swinging by pendulum, the fork-tail of escapement lever is provided with two cylindrical pins, escape wheel is the gear structure that even circumferential arranges a plurality of flat teeth, escapement lever is when swinging, two cylindrical pins alternately pass in and out the teeth groove of escape wheel, the every swing of escapement once, the angle of the rotatable tooth of escape wheel.Between escape wheel and terminal flywheel, pass through gear train transmission.
Described terminal flywheel 5 is arranged on timer spindle 1 by interior mesh ratchet gear mechanism, the first gear 2 for opening valve is installed on the main shaft 1 of timer, for the second gear 3, main shaft regularly, establishes handle topmost, the first gear 2 and tooth sector 26 engagements.
Ball valve partly comprises valve body 10, valve rod 14, spherical spool 13, valve body 10 is fixed together with the housing of timer part, the housing 4 that forms whole valve, valve rod 14 is assemblied in the valve rod pilot hole on valve body 10, and lower end connecting head 11 is inserted in the flat mouth 12 of flute profile of spool upper end.
Valve rod is provided with a lateral pin 15 through valve rod axle center, and the position of corresponding valve rod upper end, valve rod pilot hole upper end lateral pin 15 is provided with two centrosymmetric fan grooves 16.The part that valve rod 14 is stretched out at lateral pin 15 two ends lays respectively in two fan grooves 16, and the free rotational angle of lateral pin end in fan groove is 90 degree.
It is flat mouthful that a flute profile is established in valve rod upper end, is inserted in the flat mouth of flute profile of valve rod upper end, and matches with it with the lower end connecting head 9 of the rotating shaft 27 of the coaxial setting of valve rod.
In rotating shaft 27, be equipped with the clockwork spring dish 8 for throttle down, clockwork spring disk casing and housing 4 are fixing, and clockwork spring the inner of clockwork spring dish inside is fixed on valve rod, and outer end and clockwork spring disk casing are fixed.
Above clockwork spring dish 8, be provided with a gap bridge gearwheel 7 being assemblied in rotating shaft by interior mesh ratchet gear mechanism 6.Gap bridge gearwheel 7 is annular, and inner edge is ratchet 34, and outer rim is gear, and the sense of rotation that hook tooth face tilt direction is opened valve with rotating shaft is identical.Gap bridge gearwheel side is provided with a gap bridge small gear 17 being engaged with, and is coaxially installed with gap bridge small gear 17 the locking wheel 18 of establishing uniform tooth on a circumference.Swing locking bar 19 one end that arrange and be provided with two latches 36 that coordinate with the tooth of locking wheel, locking bar 19 can swing when the staggered quilt of two latches 36 impacts.The locking bar the other end is provided with percussion hammer 35, percussion hammer 35 1 sides are provided with one and hit bell (not shown), on locking bar 19, be also provided with a lock pin 31, described lock pin 31 sides are pressed on the circumference of described timer cam 20, during lock pin 31 on the corresponding locking bar of circumferential surface beyond timer cam notches 32, the outer rim that the swing of locking bar 19 is subject to timer cam 20 stops, can not swing, the flank of tooth of the stress surface of the latch 36 of static locking bar and locking wheel 18 offsets, locking is taken turns 18 locked cannot rotations, and valve closing action is restricted indirectly.When timer cam rotates to lock pin 31 on the corresponding locking bar of upper recess thereof mouth 32, lock pin 31 on the locking bar recess 32 of can freely coming in and going out, the restriction of 20 pairs of locking bars 19 of timer cam disappears, locking bar is undone the locking effect of locking wheel, locking wheel 18 and gap bridge small gear 17, gap bridge gearwheel 7, rotating shaft 27, valve rod 14, spool 13 are synchronizeed rotation closing together under the effect of valve clockwork spring, valve is closed gradually.Meanwhile, two latches 36 of the flank of tooth alternately impinge locking bar of locking wheel 18, locking bar swings continuously until valve is closed completely.Once, on it, percussion hammer 35 clashes into and once hits bell the every swing of locking bar.
In this example, above-mentioned reversion limting mechanism, on the one hand can be before the inefficacy that is triggered, and the reversion of restriction valve rod, on the other hand by realizing with the locking bar of double card toothing, in valve closing, hits bell by locking bar, reaches prompting user's effect.
Obviously, if do not needed the tinkle of bells prompt facility, or otherwise point out user's timing to finish, a latch coordinating with the tooth of locking wheel is set on locking bar, the other end is also without percussion hammer is set.
The effect of carrier gear is to reduce the impact force that latch is subject to, and extends locking wheel and locking bar working life, if do not considered this problem, can omit carrier gear, directly locking wheel 18 is assemblied in rotating shaft by ratchet mechanism 6 as gap bridge gearwheel 7.
Below tooth sector 26, around its axis hole, two fan grooves 24, along axis hole revenue centre symmetry are set and are separately positioned in two fan grooves 24 through the two ends of the lateral pin 25 in the axle center of rotating shaft 27.The free rotational angle of lateral pin 25 ends in fan groove, is tooth sector with respect to the free rotational angle of rotating shaft.
In this example, effective working pressure angle of described tooth sector 26 (being engaged to opposite side dislocation, the angle that tooth sector turns over since the first gear one side) is greater than the open and close phase angle of described rotating shaft, equals it with respect to the free rotational angle of rotating shaft.
Its working procedure is as follows:
A) use before valve, valve is in closed condition, tooth sector is in reversion dislocation state (at the first gear reverse directions lateral dislocation), the forward direction end in the flat hole of arc of tooth sector is pressed on the clubfoot of torsion spring end, the deformation of torsion spring generation forward, torsion spring produces a forward driving force to tooth sector, and its tooth of just changing one's position is resisted against on the tooth of the first gear, as shown in Figure 3.Now, tooth sector equals its poor with respect to the free rotational angle of rotating shaft and the open and close phase angle of described rotating shaft with respect to the rotating freely for angles of rotating shaft in forward direction.In reverse directions, with respect to the rotating freely for angles of rotating shaft, equal the open and close phase angle of described rotating shaft;
While b) bringing into use valve, be rotated in the forward timer spindle, the first gear forward, tooth sector starts and the first gear engagement under torsion spring effect, and forward thereupon, when the angle of swing of tooth sector equals its difference with respect to the free rotational angle of rotating shaft and the open and close phase angle of described rotating shaft, the end face of the fan groove reverse directions side below tooth sector contacts with the lateral pin in rotating shaft, now, tooth sector with respect to the free rotational angle of rotating shaft all in its reverse directions, as shown in Figure 4.Tooth sector continues with the first gear forward, will drive rotating shaft to start forward by lateral pin;
C) when tooth sector is during at the first gear forward direction lateral dislocation, the angle that tooth sector turns over equals it with respect to the free rotational angle of rotating shaft, the angle that rotating shaft turns over tooth sector just equals the open and close phase angle of rotating shaft, now, valve is opened completely, tooth sector with respect to the free rotational angle of rotating shaft still all in its reverse directions.And now, the reverse directions end in the flat hole of arc of tooth sector is pressed on the clubfoot of torsion spring end, torsion spring has been crossed its forward transition point, occurs oppositely to open change, and its active force to tooth sector is reverse, tooth sector is produced to a reversion driving force, as shown in Figure 5.The recess of timer cam forwards opposite side clockwise to, and the lock pin of locking bar end is against in timer cam outer rim, and a rear latch embeds in locking wheel teeth groove, and rotating shaft reversion is limited, as shown in figure 15;
D) decontrol regularly handle, timing starts, the first gear starts reversion under timing spring effect with main shaft, tooth sector starts again to mesh with the first gear under torsion spring effect, and reversion thereupon, the angle turning over when tooth sector equals it with respect to the free rotational angle of rotating shaft, and itself and the first gear depart from engagement, revert to reversion dislocation state, as shown in Figure 6.Now, the end face of the fan groove forward direction side below tooth sector just contacts with the lateral pin in rotating shaft, but does not interact, and torsion spring returns to forward deformed state, starts tooth sector to produce a forward driving force.In the whole Umklapp process of tooth sector, because the existence of free rotational angle, rotating shaft is moved; Groove on timer cam is not yet turned back to start bit, and reversion limting mechanism state is constant, as shown in figure 16;
E) timing finishes, timer cam notches returns start bit, the lock pin recess of can freely coming in and going out, rotating shaft is reversed under the valve clockwork spring effect of pass, starts throttle down, drives the rotation of locking wheel by ratchet mechanism, carrier gear simultaneously, two latches on locking wheel flank of tooth alternately impinge lock pin, locking bar swings continuously, and percussion hammer outwards clashes into repeatedly, as shown in Figure 17,18.When reverse angle reaches the switch phase declinate of rotating shaft, valve is fully closed, now, each parts of Timed valve are all got back to original state, and tooth sector equals open and close phase angle poor of free rotational angle and described rotating shaft in forward direction with respect to the free rotational angle of rotating shaft.In reverse directions, with respect to the free rotational angle of rotating shaft, equal the open and close phase angle of described rotating shaft, as shown in Figure 7.
By above process, be not difficult to find out, in whole process, the end face of the fan groove forward direction side of tooth sector and the lateral pin in rotating shaft are not had an effect all the time.That is to say, the free rotational angle that tooth sector turns with respect to axle can be larger, do not affect its action effect, as long as meet following condition:
1, under original state, when tooth sector is dislocated in reverse directions, valve is in closed condition, and tooth sector should exist rotating freely for angles (R with respect to rotating shaft in forward direction
just close), this rotating freely for angles equals effective working pressure angle (R of tooth sector
engagement) with the open and close phase angle (R of rotating shaft
switching difference) poor.This condition guarantees on the one hand, and tooth sector, before reset, is not had an effect with rotating shaft, and tooth sector can reset from dislocation state under the effect of the moment of torsion much smaller than switch valve, realizes and the first gear engagement.Guarantee on the other hand, when tooth sector is dislocated in forward direction, valve is opened completely;
2, tooth sector is not less than effective working pressure angle (R of tooth sector with respect to the free rotational angle (R) of rotating shaft
engagement).This condition guarantees at tooth sector, when reversing, not drive rotating shaft to shift to an earlier date throttle down;
Be formulated as: R
just close>0, R
just close+ R
switching difference=R
engagement, R>=R
engagement.
Drive connection between above-mentioned tooth sector and rotating shaft is the key point that realizes " set time is opened valve simultaneously, and timing finishes early gate and is not closed " this purpose.
What be not difficult to expect is, if can produce and enough overcome the moment of torsion that closes valve clockwork spring and valve rod, spool surface friction drag tooth sector as the torsion spring of tooth sector resetting-mechanism,, under original state, tooth sector can not have the rotating freely for angles with respect to rotating shaft in forward direction.Namely, the lowest term that realizes " simultaneously open valve during setting, and timing finishing early gate and is not closed " this purpose is: effective working pressure angle (R of tooth sector
engagement) be not more than tooth sector with respect to the free rotational angle (R) of rotating shaft, be also not less than the open and close phase angle (R of rotating shaft
switching difference).When tooth sector is dislocated in forward direction, valve open, and now its free rotational angle with respect to rotating shaft in its reverse directions, that is, now, tooth sector in reverse directions with respect to the rotating freely for angles (R of rotating shaft
counter opening) equal tooth sector with respect to the free rotational angle of rotating shaft;
Be formulated as: R>=R
engagement>=R
switching difference, R
counter opening=R.
In addition, in this example, the non-valve rod of rotating shaft, but rotate with valve rod coaxial synchronous, its transmission effect is identical with the effect that rotating shaft is valve rod itself, difference is only in the convenience of parts installation, clockwork spring dish, anti-reverse gear will be installed in rotating shaft, for a plurality of parts such as cylinder axle of timer cam are installed, on valve rod, to connect spool, and 90 degree switch limit structures are set, if rotating shaft and valve rod are the same axis, realize the assembling on the same axis of a plurality of parts, the structure of its whole axle will be very complicated.Rotating shaft and valve rod split design, can when design turning shaft structure, need not consider the relation that spool, valve body etc. assemble with it, and the parts such as clockwork spring dish, anti-reverse gear, timer cam canister axle, can from two ends, pack rotating shaft into respectively, turning shaft structure is relatively simple.The installation of each parts is also relatively convenient.
Claims (10)
1. the valve switch mechanism for mechanical type timing valve, it is characterized in that, comprise that one opens or closes the rotating shaft of valve by forward and reverse, locking wheel with rotating shaft single-way linkage, for locking the locking bar of locking wheel, in described rotating shaft, be provided with the pass valve clockwork spring for drive shaft reversion, described rotating shaft is connected by ratchet mechanism with locking wheel, ratchet mechanism engagement during rotating shaft reversion, on described locking wheel circumference, establish tooth, described locking bar first end is provided with latch, the second end is resisted against in the outer rim of timer cam, the arc profile that the outer cause of timer cam one Duan Yifangzhuan center is the center of circle and one section of sudden change profile form, when corresponding locking bar the second end of the arc profile of timer cam, the latch of locking bar first end is embedded in the teeth groove of locking wheel, when sudden change contour correspondence locking bar second end of timer cam, locking bar the second end is with sudden change contour motion, the latch of locking bar first end is deviate from the teeth groove of locking wheel.
2. valve switch structure according to claim 1, is characterized in that, described locking wheel is assemblied in rotating shaft, and locking wheel is connected with ratchet or the ratchet of ratchet mechanism respectively with rotating shaft.
3. valve switch according to claim 1 mechanism, is characterized in that, locking wheel is connected by gear drive with rotating shaft.
4. valve switch according to claim 3 mechanism, it is characterized in that, between rotating shaft and locking wheel, be provided with large and small two intermeshing carrier gears, the gearwheel of wherein passing a bridge is assemblied in rotating shaft by ratchet mechanism, and gap bridge small gear is taken turns coaxially with locking and circumferential relative being fixedly installed.
5. valve switch according to claim 4 mechanism, is characterized in that, ratchet mechanism is outer gearing formula ratchet mechanism, and ratchet and rotating shaft are fixed, and gap bridge gearwheel is sleeved in rotating shaft rotationally, and the hinged or one end of ratchet is fixed on gearwheel.
6. valve switch according to claim 4 mechanism, is characterized in that, ratchet mechanism is interior engagement type ratchet mechanism, and gap bridge gearwheel is relative with the coaxial ratchet heart to be fixedly installed, and ratchet is circumferentially arranged in rotating shaft relatively regularly.
7. valve switch according to claim 1 mechanism, it is characterized in that, described locking bar is the mobile straight-bar structure arranging, and latch is located at first end end face, the flank of tooth of locking wheel and the flank of tooth of latch interact, and locking bar is produced to an active force that points to the second end; Timer cam is on circumference, to be with jagged disc structure; When recess turns to corresponding locking bar the second end, under the locking wheel flank of tooth and the interaction of the latch flank of tooth, locking bar the second end moves into recess, and first end latch is deviate from the teeth groove of locking wheel.
8. valve switch according to claim 1 mechanism, it is characterized in that, described locking bar swings and arranges, latch arranges the forward side of first end, and locking bar the second end is resisted against in timer cam outer rim, and timer cam is on circumference, to be with jagged disc structure, timer cam is positioned at the reverse side of locking bar the second end, when corresponding locking bar the second end of the recess of timer cam, locking bar the second end swings to timer cam center, and the latch of locking bar first end is deviate from the teeth groove of locking wheel.
9. valve switch according to claim 1 mechanism, is characterized in that, timer cam and rotating shaft concentric arrange.
10. valve switch according to claim 9 mechanism, is characterized in that, timer cam installation shaft center band through hole, and rotating shaft is passed by through hole, and rotating shaft side and through hole are slidably matched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320625920.3U CN203585516U (en) | 2013-10-11 | 2013-10-11 | Valve opening and closing mechanism used for mechanical timing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320625920.3U CN203585516U (en) | 2013-10-11 | 2013-10-11 | Valve opening and closing mechanism used for mechanical timing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203585516U true CN203585516U (en) | 2014-05-07 |
Family
ID=50583434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320625920.3U Expired - Lifetime CN203585516U (en) | 2013-10-11 | 2013-10-11 | Valve opening and closing mechanism used for mechanical timing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203585516U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742703A (en) * | 2013-10-11 | 2014-04-23 | 阮迪荣 | Valve opening and closing mechanism for mechanical timing valve |
| CN110425329A (en) * | 2019-09-02 | 2019-11-08 | 漳浦金盛智能科技有限公司 | Valve opening and closing booster |
| CN113653799A (en) * | 2021-09-01 | 2021-11-16 | 西安轻工业钟表研究所有限公司 | Self-insurance unlocking mechanism |
-
2013
- 2013-10-11 CN CN201320625920.3U patent/CN203585516U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742703A (en) * | 2013-10-11 | 2014-04-23 | 阮迪荣 | Valve opening and closing mechanism for mechanical timing valve |
| CN103742703B (en) * | 2013-10-11 | 2016-08-17 | 阮迪荣 | A kind of valve switch mechanism for mechanical type timing valve |
| CN110425329A (en) * | 2019-09-02 | 2019-11-08 | 漳浦金盛智能科技有限公司 | Valve opening and closing booster |
| CN110425329B (en) * | 2019-09-02 | 2024-05-14 | 漳浦金盛智能科技有限公司 | Valve opening and closing booster |
| CN113653799A (en) * | 2021-09-01 | 2021-11-16 | 西安轻工业钟表研究所有限公司 | Self-insurance unlocking mechanism |
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Granted publication date: 20140507 |