CN103867743B - A kind of mechanical type timing valve - Google Patents

Abstract

The invention belongs to valve technology field, a kind of mechanical type timing valve is disclosed, comprise mechanical timer, valve and switch executive mechanism, mechanical timer comprises by the main shaft of timing clockwork spring driver inversion, controls the escapement speed-adjusting mechanism of main shaft gyration speed, or the camshaft that link coaxial with main shaft, and timer cam is installed on camshaft; Switch executive mechanism comprises sliding part, STATEMENT OF FEDERALLY SPONSORED and locking mechanism, and the presser feet of STATEMENT OF FEDERALLY SPONSORED is resisted against on the circumference of timer cam; Timer cam circumference is provided with recess, and when the presser feet of STATEMENT OF FEDERALLY SPONSORED enters recess, STATEMENT OF FEDERALLY SPONSORED driver card latch mechanism is removed the locking to sliding part; Sliding part is configured relevant valve activator, and STATEMENT OF FEDERALLY SPONSORED is configured with driving spring. In Timed valve timing course of the present invention, sliding part is not directly and STATEMENT OF FEDERALLY SPONSORED effect, STATEMENT OF FEDERALLY SPONSORED is little to the pressure on timer cam circumference, can effectively reduce frictional force between presser feet and cam circle side face, and then effectively avoids timing cam stall before timing finishes.

Description

A kind of mechanical type timing valve

Technical field

The invention belongs to valve technology field, relate to and how to realize the technology that valve timing is closed, be mainly used in the valve of gas pipeline.

Background technology

Gaseous fuel popularizing in domestic. applications, 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, but it is anti-existing to pay close attention to the accident that occurred for many years, mostly forgets to close because of valve 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, in the time of battery failure, timing function lost efficacy thereupon. For the user who easily forgets valve-off, 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 formed by timing mechanism and escapement speed-adjusting mechanism two parts, timing mechanism is turned round as motive power drive shaft by clockwork spring (calling timing clockwork spring in the following text), trigger executing agency's action in the time that timing finishes by cam as trigger mechanism, general independent being assemblied on camshaft of timer cam, camshaft and main shaft be by gear drive, the timer that is no more than a week for main shaft timing range, and timer cam also can directly be assemblied on main shaft.

Timing handle is generally assemblied on main shaft, also has part timer separately to establish a timing axle, assembling timing handle on timing axle, and timing axle and main shaft are by gear drive.

Escapement speed-adjusting mechanism (" mechanical timing instrument " referring to University Of Tianjin Jing Yixi timing teaching and research room write, Tianjin science tech publishing house, Tianjin, 1980 identical with the structural principle of clock and watch. " the watch structure principle " that Chen Changshan writes, Shanghai science tech publishing house, Shanghai, 1980), produce the swing of fixed frequency by balance spring mechanism, by escapement lever, swing is passed to escape wheel, by the rotating speed of two forks of escapement lever end watt or cylindrical pins alternating action control escape wheel, (the every swing of escapement once, escape wheel rotates the angle of a tooth), the rotation of escape wheel is passed through gear set drive by the terminal flywheel of guiding mechanism. Terminal flywheel coordinates by ratchet mechanism (interior engagement type ratchet mechanism) with main shaft, when 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. Hold force direction rotary main shaft by handle to clockwork spring, main shaft band moving cam leaves phase-triggered. Decontrol handle, timing starts. Clockwork spring drive shaft is slowly revolution under escapement speed-adjusting mechanism restriction, until cam revert to phase-triggered, timing finishes, and executing agency 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 the disc structure with recess on circumference. The first is by the execution of bulge-structure pushing executing mechanism, and cam is directly as the power source performing an action, and is generally used for the motive force that executing agency needs less, and executing agency moves simple occasion, as triggered touch switch. The second is to remove the restriction to executing agency by recess, by executing agency's execution voluntarily, be generally used for executing agency 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 mechanical activation alarm clock is the disc structure with recess on circumference, the effect of recess is to remove the swing restriction to alarm clock percussion hammer.

Have in the market the valve for the employing mechanical timer on gas pipeline, but in valve switch actuating mechanism, design unreasonable, generally will open valve and set time, separate, arrange two handles be respectively used to open valve and set time, this structure is not only brought not only to user's operation, but also inevitably, some user can be in the time using valve, only open valve, and while not setting, the timing function of leading Timed valve performs practically no function, do not have the dangerous effect of taking precautions against.

Aspect the valve of pass, existing machinery formula Timed valve provides the power of valve-off by timer cam, and shortcoming both ways is mainly deposited in this design, on the one hand, because the needed power of controlled valve is larger, especially ball valve. For timer cam can provide enough large power valve-off, it need to be the very large clockwork spring of timer configuration torsion, but be employed of short duration a moment that the torsion that clockwork spring is very large only finishes in timing, several thousand times of durations compared with the valve-off time (with 0.5 second valve-off used time, timing is calculated for 60 minutes, timing course is 7200 times of valve-off) 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 valve-off, also need to adopt the transmission mechanism transmission such as lever to amplify, but the use of lever will increase the size of product greatly.

In addition, with the timer cam of recess, the effect of its periphery is to limit the action of certain parts (parts that directly contact with timer cam in executing agency) in executing agency, these parts are in timing course, all the time be pressed on timer cam, and these parts be performed mechanism and link all the time, when being performed the reaction force of mechanism when very large, these parts will produce very large pressure on the circumference of timer cam, cause the larger frictional force of existence between these parts and timer cam circle side face, easily cause timer cam in the time approaching timing and finish, because the timing energy of having an effect discharges totally, be not enough to overcome frictional force on timer cam circle side face and stall. therefore, adopt the Timed valve of this executing agency, have serious potential safety hazard.

Summary of the invention

The object of the invention is, based on above-mentioned prior art, proposes the mechanical type timing valve that a kind of compact conformation reliability and safety is higher.

The technical scheme adopting is: a kind of mechanical type timing valve, comprise by switch executive mechanism be mutually related mechanical timer and valve, described mechanical timer comprises by the main shaft of timing clockwork spring driver inversion, controls the escapement speed-adjusting mechanism of main shaft gyration speed, or the camshaft that link coaxial with main shaft, and timer cam is installed on camshaft; It is characterized in that, described switch executive mechanism comprises that one by moving back and forth the sliding part that drives valve to open or close, the STATEMENT OF FEDERALLY SPONSORED that a unidirectional promotion sliding part moves to valve opening position, the locking mechanism that a restriction is moved to pass valve direction in opening the sliding part of valve location, and the presser feet of the pass valve direction side (direction that sliding part moves to the direction of valve-off) of STATEMENT OF FEDERALLY SPONSORED is resisted against on the circumference of timer cam; Timer cam circumference is provided with recess, and when the presser feet of STATEMENT OF FEDERALLY SPONSORED enters recess, STATEMENT OF FEDERALLY SPONSORED driver card latch mechanism is removed the locking to sliding part.

Sliding part is configured with and drives its pass valve activator moving to pass valve direction, can be that spring, shell fragment or other any pushing tow, tractive etc. of can producing order about parts or the mechanism that sliding part slides. STATEMENT OF FEDERALLY SPONSORED is configured with and promotes the driving spring that STATEMENT OF FEDERALLY SPONSORED is drawn close to timer cam, between the sliding part being locked by locking mechanism and STATEMENT OF FEDERALLY SPONSORED, has gap.

The above-mentioned Timed valve that the present invention proposes, by can limit slippage part to the open mode of closing mechanism that valve direction moves and maintain valve, in timing course, sliding part does not act directly in the STATEMENT OF FEDERALLY SPONSORED directly contacting with timer cam, compared with prior art, the motive force effect of the irrelevant valve activator of STATEMENT OF FEDERALLY SPONSORED directly contacting with timer cam, presser feet in STATEMENT OF FEDERALLY SPONSORED is very little to the pressure on timer cam circumference, can effectively reduce the frictional force between presser feet and cam circle side face, and then avoid to greatest extent timing cam stall before timing finishes.

According to the principle of mechanical timer, in the time that the recess on timer cam turns to the presser feet that aligns STATEMENT OF FEDERALLY SPONSORED, timing finishes. Visible, locking mechanism keeps whole timing course to the locking of sliding part, loses efficacy and triggered by STATEMENT OF FEDERALLY SPONSORED in the time that timing finishes, and the sliding part unlocking is closing under the effect of valve driving spring valve closing.

In the present invention, mechanical timer can adopt various common mechanical timer constructions and conventional modification in prior art.

In order to ensure in timing course, sliding part does not produce any active force in STATEMENT OF FEDERALLY SPONSORED, and preferably, in timing course, sliding part does not contact with STATEMENT OF FEDERALLY SPONSORED,, in timing course, between sliding part and STATEMENT OF FEDERALLY SPONSORED, keeps certain interval that is. Realize this purpose, described timer cam can have the multiple form that arranges.

One, the camshaft pilot hole of timer adopts slotted hole, the length direction of slotted hole is consistent with the glide direction of sliding part, gear on main shaft is arranged on the rear side of the gear on camshaft, and (direction moving to valve opening position taking sliding part is as front, after being reversed) position on the upper side or on the lower side, the direction of main shaft rotation when fixed cycle operator is set, make the gear on the gear mesh camshaft on main shaft produce a component forward, in the time of fixed cycle operator, cam drives timer cam to be offset forward a distance under component effect, the skew that is pushed out skew that recess produces and produces because of timer cam offset because of presser feet that superposeed of the offset distance of STATEMENT OF FEDERALLY SPONSORED, sliding part is under STATEMENT OF FEDERALLY SPONSORED promotes, the two kinds of movements that superposeed equally of its side-play amount. after setting duration, start timing, main shaft and camshaft start reversion, component forward on cam disappears, and timer cam and camshaft reset together with STATEMENT OF FEDERALLY SPONSORED under the abutment action of STATEMENT OF FEDERALLY SPONSORED, and now STATEMENT OF FEDERALLY SPONSORED is undone because of the skew that timer cam offset produces. and sliding part is because of cannot travelling backwards by locking mechanism locking, and produced gap between STATEMENT OF FEDERALLY SPONSORED.

Its two, except the set-up mode of foregoing camshaft skew, can also make timer cam produce skew with respect to cam in the time of fixed cycle operator. For example, on described timer cam for the axis hole of camshaft assembling be the guide chute for drive cam offset direction, the position diameter of camshaft hole width and camshaft assembling timer cam matches, the length direction of camshaft hole is consistent to the direction of the line of recess with the cam center of circle, and slotted hole is positioned at the direction side of the cam center of circle away from recess away from one end of recess. On timer cam, be provided with guiding skewed slot (it is angled that " tiltedly " refers to that the direction of line of recess is arrived in the length direction of groove and the center of circle) away from a side of recess. One is assemblied in chute with the relatively-stationary short pin of camshaft.

When fixed cycle operator, camshaft rotation, camshaft matches with short pin timer cam is produced to a torque, and in the time that cam notches place is subject to the reverse resistance of presser feet of the STATEMENT OF FEDERALLY SPONSORED that is positioned at its side, short pin matches and forces timer cam to be offset laterally along axis hole length direction with guiding skewed slot. Cam notches turns over after STATEMENT OF FEDERALLY SPONSORED presser feet, reduces to side side-play amount, and STATEMENT OF FEDERALLY SPONSORED is drawn close to cam axle center thereupon, and now sliding part is because of cannot travelling backwards by locking mechanism locking, and between STATEMENT OF FEDERALLY SPONSORED, produced gap.

Above-mentioned the second arranges form, and its advantage is, when timing finishes, presser feet can be skipped the side of recess, directly jumps in recess, and timing is more accurate. Weak point is, in the time that setting duration makes cam rotation half cycle above, because timer cam can move radially with respect to camshaft, causes presser feet meeting slight fluctuations in timing course of STATEMENT OF FEDERALLY SPONSORED. Though impact is little, has increased uncertain factor.

They are three years old, the deficiency of form is set based on above-mentioned the second, improve as one, can separately establish one and be exclusively used in the movable disk that produces side-play amount, specifically: timer cam is fixedly mounted on camshaft, cam is established a minor axis away from a side of recess, and recess, the center of circle and minor axis in a movable disk overlapping with timer cam on corresponding timer cam are established respectively auxiliary recesses, guide chute, guiding skewed slot. Wherein guide chute cover fits on camshaft, and guiding skewed slot cover fits on the minor axis of establishing on timer cam. Guiding skewed slot away from one end of guide chute to fixed cycle operator direction tilt (skewed slot that leads is positioned at the fixed cycle operator direction side of the other end away from one end of guide chute).

The distance that guide chute is established a lateral edges of recess near one end of recess to movable disk is (when camshaft is close to this end of chute, the axle center of camshaft is to movable ultimate range of establishing a lateral edges of recess) equal timer cam radius, in the time that movable disk is offset to the limit with respect to timer cam to the opposite direction of recess, the coincident of the edge of its notched side and timer cam, the side of the timing direction side of its recess deflects away from this side side of recess of timer cam. Guide chute transports out of the distance of one end of recess establishing a lateral edges of recess to movable disk and is greater than timer cam radius, and in the time that movable disk is offset to the limit with respect to timer cam to recess direction, the edge of its notched side deflects away from the edge of timer cam.

In the time of fixed cycle operator, camshaft drives the rotation of timer cam, camshaft matches with short pin movable disk is produced to a torque, in the time that being subject to the reverse resistance of presser feet of the STATEMENT OF FEDERALLY SPONSORED that is positioned at its side, the indent in movable disk is forced to rotate backward with respect to timer cam, relatively rotate in process, short pin matches and forces activity to be offset laterally along guide chute length direction with guiding skewed slot. when recess turns over after the presser feet of STATEMENT OF FEDERALLY SPONSORED, reduce to side side-play amount, STATEMENT OF FEDERALLY SPONSORED is drawn close to cam axle center thereupon, and now sliding part is because of cannot travelling backwards by locking mechanism locking, and between STATEMENT OF FEDERALLY SPONSORED, produced gap. after timing starts, STATEMENT OF FEDERALLY SPONSORED presser feet is pressed on the circumference of timer cam, when turning to while approaching recess, the movable disk edge that originally skew exceeds timer cam edge is subject to STATEMENT OF FEDERALLY SPONSORED presser feet to touch return, timer cam continues to timing direction rotation, the contact point of presser feet and timer cam is by excessive to the edge of movable disk on the circumference of timer cam, when presser feet compress some the recess that moves into movable disk time, movable disk because of presser feet at the active force of its recess side with respect to timer cam forward rotation, relatively rotate in process, short pin matches and forces activity to be offset laterally along guide chute length direction with guiding skewed slot.

Further, described movable disk is disk, and movable disk radius equates with timer cam radius, and guide chute overlaps with the movable disk center of circle near the center of circle, one end (when camshaft is close to this end of chute, the center of circle that the axle center of camshaft is this end) of recess.

The setting of can sliding of described STATEMENT OF FEDERALLY SPONSORED, or swing and arrange, sliding part one end correspondence is not established a side of presser feet in STATEMENT OF FEDERALLY SPONSORED.

Described locking mechanism its role is to limit slippage part reverse slide, can be the various unidirectional slip limitation functions that have, and its slip limitation function dissoluble mechanism in the time being triggered, can there be a variety of specific implementation forms, for example, locking mechanism comprises the grab arranging that slides, grab lower end is provided with latch, sliding part is provided with bayonet socket, latch snaps in downwards in bayonet socket, STATEMENT OF FEDERALLY SPONSORED upper end is provided with pushing tow inclined-plane, grab is provided with the stressed inclined-plane matching, in the time that STATEMENT OF FEDERALLY SPONSORED swings or moves to the center of circle direction of cam, pushing tow inclined-plane, upper end raises grab, the upper latch of grab is deviate from the bayonet socket of sliding part, the sliding part unlocking moves valve closing to closing valve direction under spring mechanism effect.

Again for example, locking mechanism comprises that swings the fork arranging, fork one end downside is provided with latch, sliding part is provided with bayonet socket, and latch snaps in downwards in bayonet socket, and fork other end downside is pressed on STATEMENT OF FEDERALLY SPONSORED upper end, remove from fork other end below when action occurs STATEMENT OF FEDERALLY SPONSORED, fork swings under sliding part effect, and the latch of swing link end part is deviate from the bayonet socket of sliding part, and the sliding part unlocking moves valve closing to closing valve direction under spring mechanism effect.

Again for example, locking mechanism comprises a fork, and fork is provided with trip, and sliding part is provided with the bulge-structure coordinating with trip, and fork is connected by connecting rod or bracing wire with STATEMENT OF FEDERALLY SPONSORED. When STATEMENT OF FEDERALLY SPONSORED action, pull fork by connecting rod or bracing wire, make the trip of fork depart from the bulge-structure on sliding part, remove sliding part is locked.

Improve as one, resistance is brought to the release of locking mechanism in locking position for fear of sliding part, can establish the latch member in the locking mechanism of swing, be arc surface with the interactional position of sliding part in latch member, and arc surface is taking the swinging center of latch member as axle center. When latch member swings, in the time that arc surface and sliding part are separated, to the latch-release of sliding part. In releasing process, sliding part only produces along the frictional force on tangent line latch member, to the resistance minimum of latch member.

Scheme of the present invention 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 diaphragm valve. For different valves, the concrete structure of described sliding part can be different, is directed to the diaphragm valve of valve rod movable type, and sliding part can be valve rod itself, or with the direct-connected bulk of valve rod or strip, the parts such as shaft-like. And be directed to valve rod rotary type valve, as ball valve etc., sliding part can be established in side tooth bar, is coaxially arranged with and tooth bar meshed gears with valve rod, when sliding part slides, rotates, to open or close valve by rack geared actuate valve stem.

In the present invention, manually reverse handle, make main shaft hold force direction and rotate to set the process of timing length to clockwork spring, be called timing, decontrol after handle, clockwork spring starts to discharge potential energy, drives the process of each parts action, is called timing. In the description of description, to move as front to opening valve direction, to move as rear to valve-off direction. The forward that description is mentioned, refers to fixed cycle operator or opens the direction of action that valve events is associated; Oppositely refer to timing course or close the direction of action that valve events is associated; Forward, refers to the rotation direction of each parts in timing process, comprises the rotation direction of opening valve; Reversion, refers to the rotation direction of each parts in timing course, comprises the rotation direction of valve-off. Revolution, refer to parts and last time direction of rotation rotation.

Brief description of the drawings

Fig. 1 is the whole STRUCTURE DECOMPOSITION schematic diagram of a kind of mechanical type timing ball valve based on scheme of the present invention.

Fig. 2 is mechanical type timing ball valve matching relationship schematic diagram between each drive disk assembly in the time of closed condition.

Fig. 3 is while starting fixed cycle operator, the matching relationship schematic diagram between the each drive disk assembly of mechanism type timing ball valve.

Fig. 4 is in timing process, view when STATEMENT OF FEDERALLY SPONSORED, sliding part reach unidirectional range.

Fig. 5 is in timing process, configuration state schematic diagram when STATEMENT OF FEDERALLY SPONSORED and sliding part depart from.

Fig. 6 is while starting timing, the matching relationship schematic diagram between each drive disk assembly.

Fig. 7 is in timing course, the matching relationship schematic diagram between each drive disk assembly.

Fig. 8 is that timing finishes, matching relationship schematic diagram mutually before each parts do not move.

Fig. 9 is the structural principle schematic diagram that movable cam axle is set separately realizes timer cam offset.

Figure 10 is another kind of locking mechanism structural principle schematic diagram.

Figure 11 sets up timer cam to realize its structural principle schematic diagram with respect to main shaft or camshaft skew.

Detailed description of the invention

Below in conjunction with accompanying drawing, know-why and effect thereof as an example of a mechanical type timing ball valve example to technical scheme of the present invention are described further.

With reference to Fig. 1-8, this picture group is disclosed be can automatic-closing valve after a kind of timing finishes mechanical type timing ball valve, wherein, Fig. 2-8 are shown for timing ball valve makes several configuration states in process.

Diagram mechanical type timing ball valve comprises the switch executive mechanism three parts of mechanical timer and ball valve and ball valve. ball valve is made up of valve body 1, spool 2, valve rod 3. mechanical timer arranges between upper and lower seat board, the escapement speed-adjusting mechanism (not shown) of mechanical timer can adopt the relatively simple common pin pallet escapement speed governing of structure, comprise balance spring mechanism 19, escapement lever, escape wheel, gear train, flywheel composition, 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 multiple flat teeth, escapement lever is in the time 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 17, pass through gear train transmission. in gear train, one of them gear can oppositely be dislocated.

Described terminal flywheel 17 is assemblied on timer spindle 15, is also equipped with timing clockwork spring 18, lower seat board is stretched out in main shaft 15 lower ends on the main shaft 15 of timer, and main shaft lower end is provided with handle 20. Upper base plate is stretched out in main shaft upper end, and timer cam 10 is fixed in main shaft upper end, and movable disk 21 is arranged at timer cam 10 belows, and movable disk 21 fits on main shaft by guide chute cover on it. Movable disk 21 is disc structure with timer cam 10, and radius equates (in figure, for offering an explanation both, movable disk 21 being drawn biggerly). On movable disk 21 and timer cam 10, be equipped with V-type recess, the periphery smooth excessiveness of the reversion lateral edges of recess and movable disk 21 or timer cam 10. A side away from recess on timer cam 10 face is down provided with short pin, and short pin, recess and the cam center of circle are close to sight alignment. A side away from recess in movable disk 21 is provided with guiding skewed slot, together with guiding skewed slot fits over short guide. Guiding skewed slot tilts to forward direction away from one end of disk center.

The sliding part 7 that switch executive mechanism arranges latch member 13, slip setting by the STATEMENT OF FEDERALLY SPONSORED 8, the swing that swing setting forms, the member of STATEMENT OF FEDERALLY SPONSORED 8 for being processed by sheet material, its lower end and housing pivot joint, middle part part material is bent to form presser feet 9 backward, top is provided with elbow 16 forward, elbow 16 is provided with for blocking joins opening that torsion spring turns round arm draw-in groove forward, and for overlapping the hole of connective pole 14. The front of being located at STATEMENT OF FEDERALLY SPONSORED 8 for promoting torsion spring 30 that STATEMENT OF FEDERALLY SPONSORED 8 draws close to timer cam 10, one is turned round arm and is stuck in the draw-in groove on STATEMENT OF FEDERALLY SPONSORED 8 upper end elbows, and connecting rod 14 rear ends have the collar, and the collar is socketed in the hole on STATEMENT OF FEDERALLY SPONSORED 8 upper end elbows 16. Connecting rod 14 front ends are through arranging bending after a connecting hole of latch member 13 upper ends, connect together with the unidirectional hook of latch member 13 (connecting rod 14 pulls forward latch member 13, backward with not effect mutually of latch member 13). Latch member 13 lower ends arrange on housing by rotating shaft, and front side, lower end has one section of arc surface 11, and the axle center of arc surface is identical with rotating shaft core. The torsion spring 12 swinging forward for push card lock construction element 13 upper ends is set in the rotating shaft of latch member 13, and one turns round arm is pressed on the top rear side of latch member 13.

Sliding part 7 is bar-like member, and upside is provided with a projection 27, and front end is provided with compressed strong spring 5, and rear end correspondence is in STATEMENT OF FEDERALLY SPONSORED 8 front sides, middle part. Sliding part 7 downsides are provided with one section of rack configurations 6, establish the gear 4 matching with tooth bar on valve rod 3.

In this example, while opening valve fixed cycle operator, described STATEMENT OF FEDERALLY SPONSORED 8 promotes sliding part 7 to front slide under movable disk 21 effects, when sliding part 7 upside projections are forward behind arc surface 11 lower ends of latch member 13, being blocked by arc surface 11 cannot travelling backwards, in timing course, sliding part 7 is locked by the arc surface 11 of latch member 13 all the time, and between STATEMENT OF FEDERALLY SPONSORED 8, keeps a gap.

Its course of work is as follows:

A) as shown in Figure 2, use before valve, valve is in closed condition, and handle fixed timing mark is indicated at 0. The recess of timer cam 10 and movable disk 21 is all towards front, STATEMENT OF FEDERALLY SPONSORED 8 presser feet 9 be positioned at recess, camshaft is positioned at movable disk 21 guide chutes away from notch end, minor axis is positioned at movable disk 21 and leads skewed slot away from notch end, movable disk 21 notched side outer rims partially outside timer cam 10 these side outer rims, the reversion lateral edges of the recess of movable disk 21 partially timer cam 10 recesses with lateral edges outside. Latch member 13 upper ends are at the STATEMENT OF FEDERALLY SPONSORED 8 traction action bottoms at rear side, and the arcwall face lower edge of lower end is higher than the projection of sliding part 7. Sliding part 7 rear ends are pressed on STATEMENT OF FEDERALLY SPONSORED 8 front sides, middle part.

B) while bringing into use valve, be rotated in the forward the handle on timer spindle, timing clockwork spring starts to put aside potential energy, and timer cam 10 is with main shaft forward simultaneously. Synchronous forward under the short pin effect of movable disk 21 on main shaft and timer cam 10. STATEMENT OF FEDERALLY SPONSORED 8 presser feets 9 act on the reversion lateral edges of movable disk 21 recesses, and STATEMENT OF FEDERALLY SPONSORED 8 presser feets 9 act on the power that the power at recess edge and short pin act on A end on guiding skewed slot and reach balance, and movable disk 21 remains unchanged with respect to the skew of timer belling wheel. In the process of movable disk 21 and timer cam 10 forwards, STATEMENT OF FEDERALLY SPONSORED 8 presser feets 9 squeeze to push away at movable disk 21 recesses reversion lateral edges 25 and under effect, are forced to slowly skid off recess. STATEMENT OF FEDERALLY SPONSORED 8 overcomes the active force of torsion spring 30, forwards swings as axle center taking the pivot of lower end 26, and the active force that promotion sliding part 7 overcomes Compress Spring 5 forwards slides. Meanwhile, STATEMENT OF FEDERALLY SPONSORED 8 upper ends promote connecting rod 14 and move forward, and loosen gradually the tractive to latch member 13. Latch member 13 upper ends swing forward under torsion spring 12 effects, and the lower edge of the arcwall face 11 of lower end deflects down. Sliding part 7 forwards in sliding process, when its upside projection 27 lower edge through latch member lower end arcwall faces 11, offsets with the leading flank 28 of arcwall face lower edge, overcomes the active force of torsion spring 12, makes latch member produce a low-angle backswing, as shown in Figure 3. In the time that STATEMENT OF FEDERALLY SPONSORED presser feet skids off from movable disk recess completely, STATEMENT OF FEDERALLY SPONSORED 8 and sliding part 7 all reach maximum activity stroke forward, and sliding part upside projection 27 moves to the rear side of arcwall face lower edge. Tooth bar 6 turns over 90 degree by gear 4 actuate valve stem 3, and valve is opened completely. As shown in Figure 4.

C) when STATEMENT OF FEDERALLY SPONSORED presser feet 9 along movable disk deflect away from timer cam edge slide time, between presser feet and movable disk edge, there is a frictional force, this frictional force still can with timer cam on short pin the active force of movable disk is reached to balance; The state that movable disk edge deflects away from timer cam remains unchanged. The edge that deflects away from timer cam along with movable disk turns over presser feet gradually, and STATEMENT OF FEDERALLY SPONSORED is backswing gradually, sliding part with STATEMENT OF FEDERALLY SPONSORED travelling backwards certain distance after, because its upside projection 27 is stopped and locks by the arc surface 11 of latch member. Between sliding part and STATEMENT OF FEDERALLY SPONSORED, form a gap, as shown in Figure 5.

D) set after timing length, decontrol timing handle, timing starts, and main shaft starts to drive timer cam reversion under timing spring effect, and movable disk is subject to reverse friction power return because of edge; STATEMENT OF FEDERALLY SPONSORED presser feet is resisted against timer cam outer rim and slides. Directly cause timing and approach end, in whole timing course, only timer parts of words is moving, and STATEMENT OF FEDERALLY SPONSORED, sliding part, latch member etc. are not all moved. Sliding part is protected a gap with STATEMENT OF FEDERALLY SPONSORED all the time, as shown in Figure 6, Figure 7. In whole timing course, presser feet comes from the back-moving spring of STATEMENT OF FEDERALLY SPONSORED to the pressure of timer cam outer rim, because STATEMENT OF FEDERALLY SPONSORED back-moving spring is only drawn close to timer cam for promoting STATEMENT OF FEDERALLY SPONSORED, only need very little power, do not need as for promoting bulky spring sliding part actuate valve stem rotation. Therefore, to act on pressure on timer cam circle side face very little for STATEMENT OF FEDERALLY SPONSORED. Avoid to greatest extent because the frictional force of presser feet on timer cam circle side face causes the problem of timer cam stall before timing finishes.

E) before timing finishes, STATEMENT OF FEDERALLY SPONSORED presser feet compresses a little by the translation of timer cam outer rim excessively to movable disk outer rim, enters movable disk recess until compress an edge, and as shown in Figure 8, timing finishes. Now, the reversion lateral edges 25 of movable disk recess is under pressure, and movable disk is under the guide effect such as main shaft, short pin, and moment is offset to notched side. Presser feet falls into recess, and STATEMENT OF FEDERALLY SPONSORED swings rapidly backward, and STATEMENT OF FEDERALLY SPONSORED upper end pulls latch member to swing backward by connecting rod, and the lower edge of latch member lower end arcwall face raises with swinging. When arcwall face lower edge is during higher than the upper limb of sliding part upside projection, the locking of sliding part is disengaged. Under the effect of Compress Spring 5, sliding part 7 moves rapidly backward, directly causes its rear end and arrives in STATEMENT OF FEDERALLY SPONSORED front side. Sliding part is rapidly backward in mobile process, and its upper rack 6 is with ovable valve stem 3 to be rotated counterclockwise by gear 4, and by valve closing, the state after valve closing as shown in Figure 2.

In this example, timer cam is directly assemblied on main shaft, and structure is relatively simple. Be not difficult to expect, timer cam and movable disk can be arranged on the camshaft of only product. Camshaft and main shaft pass through by gear mechanism transmission. Its functional effect not there are differences.

With reference to Fig. 9-11, this group is simply to have exemplified three kinds of organization plans that are different from example. Wherein Fig. 9 is the structural principle schematic diagram that movable cam axle is set separately realizes timer cam offset. Wherein timer cam is fixedly installed on camshaft, and camshaft and main shaft are by gear drive, and camshaft two ends are arranged in the chute-type axis hole on housing. When fixed cycle operator, mainshaft gear produces a component that points to STATEMENT OF FEDERALLY SPONSORED presser feet to cam shaft gear, and actuating cam axle is offset certain distance to presser feet direction together with timer cam. Decontrol after handle, start timing, mainshaft gear reversion, disappears to the component of cam shaft gear. Timer cam drives oppositely mobile reset of camshaft under the effect that pushes of presser feet.

Figure 10 is another kind of locking mechanism structural principle schematic diagram. This locking mechanism, adopts the mobile swing replacing in upper example. Respectively there is by contrast advantage. Figure 11 sets up timer cam to realize its structural principle schematic diagram with respect to main shaft or camshaft skew. Compared with the scheme that movable disk is set with upper example, structure is simpler.

Claims (10)

1. a mechanical type timing valve, comprise by switch executive mechanism be mutually related mechanical timer and valve, described mechanical timer comprises by the main shaft of timing clockwork spring driver inversion, controls the escapement speed-adjusting mechanism of main shaft gyration speed, or the camshaft that link coaxial with main shaft, and timer cam is installed on camshaft; It is characterized in that, described switch executive mechanism comprises that one by moving back and forth the sliding part that drives valve to open or close, the STATEMENT OF FEDERALLY SPONSORED that a unidirectional promotion sliding part moves to valve opening position, the locking mechanism that a restriction is moved to pass valve direction in opening the sliding part of valve location, and the presser feet of the pass valve direction side of STATEMENT OF FEDERALLY SPONSORED is resisted against on the circumference of timer cam; Timer cam circumference is provided with recess, and when the presser feet of STATEMENT OF FEDERALLY SPONSORED enters recess, STATEMENT OF FEDERALLY SPONSORED driver card latch mechanism is removed the locking to sliding part; Described sliding part is configured with and drives its pass valve activator moving to pass valve direction, and STATEMENT OF FEDERALLY SPONSORED is configured with and promotes the driving spring that STATEMENT OF FEDERALLY SPONSORED is drawn close to timer cam.

2. mechanical type timing valve according to claim 1, is characterized in that, between the sliding part being locked by locking mechanism and STATEMENT OF FEDERALLY SPONSORED, has gap.

3. mechanical type timing valve according to claim 1, is characterized in that, described pass valve activator is parts or the mechanism that spring, shell fragment or other can produce pushing tow, traction action.

4. mechanical type timing valve according to claim 1, it is characterized in that, described timer cam is fixedly mounted on camshaft, timer cam is established a minor axis away from a side of recess, and recess, the center of circle and minor axis in a movable disk overlapping with timer cam on corresponding timer cam are established respectively auxiliary recesses, guide chute, guiding skewed slot; Wherein guide chute cover fits on camshaft, and guiding skewed slot cover fits on the minor axis of establishing on timer cam; Guiding skewed slot tilts to fixed cycle operator direction away from one end of guide chute.

5. mechanical type timing valve according to claim 4, it is characterized in that, in the time that movable disk is offset to the limit with respect to timer cam to the opposite direction of recess, the coincident of the edge of its notched side and timer cam, the side of the timing direction side of its recess deflects away from this side side of recess of timer cam; In the time that movable disk is offset to the limit with respect to timer cam to recess direction, the edge of its notched side deflects away from the edge of timer cam.

6. mechanical type timing valve according to claim 5, is characterized in that, described movable disk is disk, and movable disk radius equates with timer cam radius, and guide chute overlaps with the movable disk center of circle near the center of circle, one end of recess.

7. mechanical type timing valve according to claim 1, is characterized in that, latch member in locking mechanism swings and arranges, and in latch member, is arc surface with the interactional position of sliding part, and arc surface is taking the swinging center of latch member as axle center.

8. mechanical type timing valve according to claim 1, is characterized in that, described valve is valve rod rotary type valve, and sliding part can be established tooth bar in side, is coaxially arranged with and tooth bar meshed gears with valve rod.

9. mechanical type timing valve according to claim 1, is characterized in that, the valve of described valve rod movable type, and described sliding part is and the direct-connected bulk of valve rod, strip or rod-like members.

10. mechanical type timing valve according to claim 1, it is characterized in that, described camshaft and main shaft are same axis, described STATEMENT OF FEDERALLY SPONSORED lower end and housing are rotationally connected, presser feet is arranged on STATEMENT OF FEDERALLY SPONSORED middle part, one end socket of STATEMENT OF FEDERALLY SPONSORED upper end and connecting rod, and the unidirectional hook in the connecting rod other end and latch member upper end connects, latch member lower end is rotatably connected on housing, and front side, lower end has one section of arc surface taking rotating shaft core as axle center; Latch member is configured with the driving spring that push card lock construction element upper end swings forward; Sliding part is bar-like member, and upside is provided with a projection, and front end is provided with compressed strong spring, and rear end correspondence is in front side, STATEMENT OF FEDERALLY SPONSORED middle part; Sliding part downside is provided with one section of rack configurations, establishes the gear matching with tooth bar on the valve rod of valve.