CN102235527B - Metering valve - Google Patents
Metering valve Download PDFInfo
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- CN102235527B CN102235527B CN201010163291.8A CN201010163291A CN102235527B CN 102235527 B CN102235527 B CN 102235527B CN 201010163291 A CN201010163291 A CN 201010163291A CN 102235527 B CN102235527 B CN 102235527B
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Abstract
The invention provides a metering valve which comprises a valve core arranged in a valve body, a metering sleeve, a center valve rod and a spring, wherein two groups of sealing elements and sealing working surfaces are formed between the metering sleeve and the center valve rod and can be sealed, a metering chamber is defined by the two sealing elements as well as the internal surface of the metering sleeve and the external surface of the metering sleeve between the two sealing elements, and each sealing working surface is composed of a cylindrical seal surface, a transitional surface and a non-seal surface, during the process that the sealing elements and the sealing working surfaces slide relative to each other so as to realize seal or detach seal, the sealing working surfaces do not cut the sealing elements; and in addition, the spring with appropriate fatigue strength appropriate is selected according to the actual stress in operation. Therefore, in the metering valve provided by the invention, the sealing elements and the spring are not easy to damage or lapse, thus the metering valve has the advantage of longer service life.
Description
Technical field
The present invention relates to valve technology field, particularly, relate to a kind of for controlling the quantitative valve of the outwards quantitative release fluids of fluid source.
Background technique
Quantitative valve is that a kind of can fluid sources each flow outwards discharging carry out the Special valve of accurately controlling.Quantitative valve purposes is in daily life very extensive, such as being provided with quantitative valve in the products such as common spray, fuel type nail gun.
Refer to Fig. 1, wherein show name and be called a kind of quantitative valve for fuel nail gun that U. S. Patent that " External metering valve for a fuelcell " patent No. is US6302297 provides.This quantitative valve comprises valve body 16 and is arranged at spool 32, spring 40, Sealing 46 and the Sealing 44 in valve body 16.Wherein, fuel pot 12 is connected with the lower end of valve body 16 and then is communicated with spring housing 29 and the demand chamber 30 of valve body 16 inside.Spring 40 is arranged in spring housing 29, and spool 32 ends are connected with spring 40 and run through demand chamber 30 and spring housing 29.Spool 32 center is provided with fluid passage 41, and its sidewall is provided with the through hole 42 that runs through sidewall, and its outer peripheral surface is provided with the step 48 of a circle projection, by the elastic force effect of spring 40, step 48 and Sealing 46 is closely cooperated, thereby prevents that fluid from discharging to the external world.The working procedure of above-mentioned quantitative valve is as follows: in the time there is no External Force Acting in spool 32, the liquefied gas as fuel in fuel pot 12 is full of demand chamber 30; Spool 32 can be under external force to spring 40 1 lateral movements, and realize sealing with Sealing 44, thereby demand chamber 30 is isolated with spring housing 29, the fluid in demand chamber 30 is kept; When spool 32 continues to spring 40 1 lateral movements under external force until the vent 42 of spool 32 sidewalls enters behind the region of demand chamber 30 through Sealing 46, in demand chamber 30, liquefied gas as fuel is released via through hole 42 and fluid passage 41.
Above-mentioned quantitative valve of the prior art can play the effect of release fluids quantitatively to a certain extent, but it inevitably exists following defect:
One, in the working procedure of above-mentioned quantitative valve, the inner hole surface generation reciprocating friction of the vent on spool sidewall and Sealing 46, Sealing 46 is easy to be caused wearing and tearing by the edge cuts of the through hole 42 on spool sidewall.Evidence, diameter is that the spool sidewall through hole of 0.4mm is without any burr in the situation that, after the to-and-fro motion of the thickness Sealing experience that is 1mm 3000 times to 5000 times, the cylinder inner hole surface of Sealing will be gone out the groove of enough degree of depth and cause seal fails by the edge cuts of spool sidewall through hole; This experiment proves simultaneously, when the diameter of spool side through hole increases or during when a small amount of injection moulding burr of marginal existence of through hole, the speed of seal fails will be more obvious.Visible, the suffered cutting wearing and tearing of Sealing are the major reasons that cause its inefficacy, and the actual life of Sealing further will affect the working life of quantitative valve, therefore the quantitative valve that, above-mentioned prior art provides exists because Sealing is subject to cutting wearing and tearing and causes valve too short shortcoming in working life.
They are two years old, in above-mentioned quantitative valve, the structure of demand chamber is mainly made up of jointly spool and part valve body structure, and therefore, this part valve body structure that forms demand chamber will determine the volume size of demand chamber, if obtain the demand chamber that volume is less, just must control the internal diameter of this part valve body structure.But, assembling when spring due to needs by spring through this demand chamber, this just makes the optional size of spring outer diameter be severely limited, there is the enough rigidity size of control spring strictly again selecting should make spool Rapid reset when spring, thereby cause that final selected spring outer diameter is very little but rigidity is very strong, because this spring is worked all the time under the stress higher than himself fatigue strength, thereby be severely limited the fatigue life of spring.In the time that spring approaches its fatigue life, cannot make spool Rapid reset, now, therefore quantitative valve will lose efficacy.Visible, the quantitative valve that above-mentioned prior art provides exists and causes valve too short shortcoming in working life because spring fatigue intensity cannot meet stress demand.
Summary of the invention
For addressing the above problem, the invention provides a kind of quantitative valve, it can effectively avoid the cutting wearing and tearing of black box, and can adopt the spring with high fatigue strengths in its valve body, thereby makes quantitative valve provided by the invention have longer working life.
For this reason, the invention provides a kind of quantitative valve, for controlling fluid source outside release fluids quantitatively, described quantitative valve comprises the valve body being connected with fluid source, on valve body, be provided with a spool through valve body, valve core inside has the passage for outside release fluids.Wherein, be also provided with quantitative cover, center valve rod and spring in valve body, quantitatively outer surface and the spool internal surface on the top of cover are tightly connected; Spring is arranged between quantitative cover lower end and the bottom surface of valve inner; Quantitatively cover and spring housing are contained in the outside of center valve rod, and center valve stem slides relatively; Near the upper inner of quantitative cover and on the valve rod of center, be respectively arranged with the first Sealing and the first sealed working face, near the lower end of quantitatively overlapping internal surface with on the valve rod of center, be respectively arranged with the second Sealing and the second sealed working face; Sealed working face comprises and can form column sealed of slipper seal, the non-tight face that can not contact with Sealing and be connected to non-tight face and between column sealed and the transitional surface that the two is seamlessly transitted at least partly with Sealing; Two Sealings and the internal surface of the quantitative cover between two Sealings and the outer surface of center valve rod surround the demand chamber of quantitative valve jointly.
Wherein, quantitatively quantitative, the opening and closing process of the determining positions quantitative valve of relative sliding between the valve rod of Tao Yu center, wherein: in the time there is no External Force Acting in quantitative cover, quantitative valve is closed, the first Sealing contacts with the column sealed face of the first sealed working face and in sealing state, the second Sealing does not contact with the second sealed working face, and the fluid in fluid source is full of demand chamber; In the time being quantitatively enclosed within External Force Acting lower compression spring and center valve rod starts to slide relatively, the first Sealing slides also still in sealing state towards transitional surface direction along the column sealed of the first sealed working face; The second Sealing gradually by the non-tight of the second sealed working face towards transitional surface and column sealed slip, now quantitative valve enters quantitative state, the fluid equating with demand chamber volume is maintained in demand chamber; In the time that quantitative cover continues Compress Spring under external force and relatively center valve rod continues to slide, the second Sealing slides and still in sealing state along column sealed of the second sealed working face; The first Sealing slides and finally departs from the first sealed working face and no longer formation sealing to transitional surface and the non-tight face of the first sealed working face gradually from the column sealed face of the first sealed working face, now quantitative valve enters opening state, and the fluid remaining in demand chamber outwards discharges via the passage of valve core inside; After external force is cancelled, there is the relative sliding contrary with glide direction when the quantitative valve opening process in the elastic force effect Xia Yu center valve rod that is quantitatively enclosed within spring, and finally makes quantitative valve close.
Wherein, the first Sealing and the second Sealing are all arranged on the valve rod of center, and accordingly, the first sealed working face and the second sealed working face are all arranged on the inwall of quantitative cover.
Wherein, the first Sealing and the second Sealing are all arranged on the inwall of quantitative cover, and accordingly, the first sealed working face and the second sealed working face are all arranged on the valve rod of center.
Wherein, the first Sealing and the second sealed working face are arranged on the valve rod of center, and accordingly, the first sealed working face and the second Sealing are arranged on the inwall of quantitative cover.
Wherein, the first sealed working face and the second Sealing are arranged on the valve rod of center, and accordingly, the first Sealing and the second sealed working face are arranged on the inwall of quantitative cover.
Wherein, also comprise valve rod spring, valve rod spring fitting portion is set in the lower end of center valve rod, valve rod spring fitting is between the lower end and valve rod spring fitting portion quantitatively overlapped.
Wherein, quantitatively put the limited part being provided with for limiting the relative sliding scope between the valve rod of quantitative Tao Yu center.
Wherein, described non-tight face is conical surface, plane or the parabola vertical with the axis of described column sealed.
Wherein, the valve rod fitting seat of Yi Gekeyu center valve rod interference fit is set on the bottom surface of valve inner, and on the sidewall of valve rod fitting seat, groove is set, simultaneously on the valve rod of center the groove location in corresponding valve rod fitting seat and arrange can with the close-fitting flange of groove; Or, on the sidewall of described valve rod fitting seat, flange is set, simultaneously on the valve rod of described center the lugs position in corresponding described valve rod fitting seat and arrange can with the close-fitting groove of described flange; Center valve rod inserts after valve rod fitting seat, by closely cooperate Er Shi center valve rod and an entirety of valve body formation between flange and groove.
Wherein, valve body is provided with the interface being connected with fluid source, uses so that the fluid in fluid source enters valve inner.
Wherein, be provided with spool guide card, seal spool part and retaining ring between spool and valve body, spool can carry out sealing slip with valve body under the guiding of spool guide card and seal spool part, and retaining ring is in order to fixedly mount spool guide card and seal spool part.
Wherein, the internal surface of the bottom of spool connects together by the mode of interference fit with the outer surface on the top of quantitatively overlapping, and be provided with Sealing at spool with between quantitatively overlapping, in order to guarantee quantitatively to overlap the sealing between the outer surface on top and the internal surface of spool bottom.Wherein, have downward step surface at valve core inside, Sealing is arranged between the downward step surface of valve core inside and the upper-end surface of quantitative cover.Wherein, quantitatively overlapping the outside step surface upwards that has, Sealing is arranged between quantitative cover outside step surface upwards and the lower end surface of spool.
With respect to prior art, the present invention has following beneficial effect:
One, quantitative valve provided by the invention comprises valve body, be arranged at the spool in valve body, quantitatively cover, center valve rod and spring, wherein, quantitatively cover is sleeved on the valve rod of center slidably, quantitatively between the valve rod of Tao He center, be provided with two groups of Sealing and sealed working faces that can cooperatively interact and realize slipper seal, two Sealings and the internal surface of the quantitative cover between two Sealings and the outer surface of center valve rod surround demand chamber jointly, realize the quantitative of quantitative valve by changing the relative position of quantitative Tao Yu center valve stem slides, opening and closing process.Wherein, sealed working face comprises column sealed, non-tight face and the transitional surface that above-mentioned column sealed and non-tight face are connected smoothly, owing between the each several part surface on sealing working surface being mild transition connection, thereby can avoid occurring on sealed working face obvious seamed edge or burr, like this, in terms of existing technologies, Sealing in the present invention is realized sealing or is departed from the process sealing and is difficult for being cut/wearing and tearing coordinating with sealed working face, therefore, the problem that quantitative valve provided by the invention can effectively avoid Sealing to lose efficacy because of cutting wearing and tearing, thereby there is longer working life.
They are two years old, quantitative valve provided by the present invention, its demand chamber is quantitatively between the valve rod of Tao He center, the size of demand chamber depends primarily on the structure of quantitative Tao He center valve rod, and the size of valve inner be there is no to too strict requirement, thereby in the time selecting the outside dimension of spring, be no longer subject to the restriction of cavity size; And spring is arranged at the lower end of quantitative cover, demand chamber is positioned at the inside of quantitative cover, thereby in the time selecting the outside dimension of spring, is also no longer subject to the restriction of demand chamber size.Therefore, quantitative valve provided by the present invention can be selected all suitable springs of size and rigidity according to actual working stress, thereby overcome the problem of the spring fatigue strength deficiency existing in prior art, and then can effectively extend the working life of quantitative valve.
Accompanying drawing explanation
Fig. 1 is the structure sectional view of existing a kind of quantitative valve;
Fig. 2 is a kind of shape schematic diagram of common liquefied gas tank;
Fig. 3 a to 3d is followed successively by stereogram, plan view, right elevation and the rear view of quantitative valve the first specific embodiment provided by the invention;
Fig. 4 is the sectional view along A-A cross section in Fig. 3 b embodiment illustrated in fig. 3, and the quantitative valve in this figure is in closed condition;
Fig. 5 is quantitative valve embodiment illustrated in fig. 4 sectional view in the time of quantitative state;
Fig. 6 is quantitative valve embodiment illustrated in fig. 4 sectional view in the time of opening state;
Fig. 7 is the sectional view of the second specific embodiment of quantitative valve provided by the invention;
Fig. 8 is the sectional view of the third specific embodiment of quantitative valve provided by the invention;
The sectional view of the demand chamber structure adopting in the 4th kind of specific embodiment that Fig. 9 is quantitative valve provided by the invention;
The sectional view of the demand chamber structure adopting in the 5th kind of specific embodiment that Figure 10 is quantitative valve provided by the invention; And
The sectional view of the demand chamber structure adopting in the 6th kind of specific embodiment that Figure 11 is quantitative valve provided by the invention.
Embodiment
For making those skilled in the art understand better technological scheme of the present invention, below in conjunction with accompanying drawing, quantitative valve provided by the invention is described in detail.
Seeing also Fig. 3 a to 3d, is the external structure of quantitative valve the first specific embodiment provided by the invention.This quantitative valve is first introduced for example, fluid in fluid source (, the liquefied gas tank shown in Fig. 2) in its valve body, afterwards the fluid entering in its valve body is carried out quantitatively, then via the passage of valve core inside, the release of fluid of predetermined amount of flow being gone out.
See also Fig. 4 to Fig. 6, the sectional view in closing, quantitatively and when opening state respectively for quantitative valve provided by the invention.For ease of describing structure and the position relationship of each part of quantitative valve, in this specification to the description about orientation all take direction shown in the drawings as benchmark, for example, quantitatively the upper end of cover refers to the Gao one end, position quantitatively putting when quantitative valve is placed according to direction shown in accompanying drawing, by that analogy.
As shown in the figure, the side of the valve body 5 of quantitative valve is provided with the interface 18 that can be connected with fluid source, uses so that the fluid in fluid source enters valve body 5 inside.Be provided with spool 2 in the inside of valve body 5, quantitatively overlap 1, several critical pieces such as center valve rod 3, spring 7, valve rod spring 6.
Wherein, the top of spool 2 is one section of thinner valve rod, and this valve stem part is installed in the mounting hole of seal spool part 10, spool guide card 11, and retaining ring 12 is fixed on seal spool part 10 and spool guide card 11 upper end of valve body 5.Spool 2 can slide axially and circumferentially rotate under the guiding of the mounting hole of spool guide card 11, and seal spool part 10 can prevent gap between spool 2 and spool guide card 11 of fluid in valve body 5 and leak.Spool 2 inside have the passage 21 for release fluids, and the fluid entering in valve body 5 finally all will be discharged via this passage 21 quantitatively.
The bottom of spool 2 is socketed in the top of quantitative cover 1, here, that section of sleeve-like configuration that in spool 2, diameter is embedded in more greatly and completely valve body 5 inside is called the bottom of spool 2, quantitatively overlaps the top that part in the internal surface that is socketed in spool 2 bottoms on 1 is called quantitative cover 1.Between the outer surface of the sleeve-like configuration of spool 2 bottoms and valve body 5, be Spielpassung, the internal surface of this sleeve-like configuration connects together with the outer surface on the top of quantitative cover 1 in the mode of interference fit.There is a downward step surface in the inside of this sleeve-like configuration, between the upper-end surface of quantitative cover 1 and the inner downward step surface of spool 2, be provided with a Sealing 9, in order to guarantee the sealing between the outer surface on top and the internal surface of the bottom of spool 2 of quantitative cover 1.Spring 7 is arranged between the lower end surface of quantitative cover 1 and the bottom surface of valve body 5 inside, and provides elastic force for quantitatively overlapping 1.Quantitatively cover 1 and spring 7 are sleeved on the outside of center valve rod 3, and center valve rod 3 slides relatively.The external diameter of valve rod spring 6 is less than the internal diameter of spring 7 and is positioned at spring 7 inside, and the lower end of center valve rod 3 is provided with valve rod spring fitting portion 17, and valve rod spring 6 is arranged on this valve rod spring fitting portion 17 and quantitatively overlaps between 1 lower end surface.
Between quantitative cover 1 and center valve rod 3, be provided with two groups of Sealing and sealed working faces that can cooperatively interact and realize sealing, specifically comprising: be arranged near the first sealed working face 15 quantitative cover 1 upper inner be arranged on center valve rod 3 can be suitable with the first sealed working face 15 the first Sealing 8a; And, be arranged near the second sealed working face quantitative cover 1 internal surface lower end and be arranged on center valve rod 3 can be suitable with the second sealed working face the second Sealing 8b.For ease of assembling, the first Sealing 8a is fixed in the mounting groove of Sealing fixed cover 4, then Sealing fixed cover 4 is sleeved on to the position of center valve rod 3 near top, above Sealing fixed cover 4, be provided with limited location snap ring 13, in order to limit the axial position of Sealing fixed cover 4 on center valve rod 3; The second Sealing 8b is directly sleeved in the mounting groove on center valve rod 3.The formulation amount that is limited cover 1 stroke sliding with respect to center valve rod 3, also be provided with limited part 14 at the internal surface that quantitatively overlaps 1, in the present embodiment, this limited part 14 is for being arranged on the boss on quantitative cover 1 inwall, and this boss is between the first sealed working face 15 and the second sealed working face.
Above-mentioned the first sealed working face 15 specifically also comprises: can with Sealing 8a form column sealed 15a of slipper seal, at least partly the non-tight face 15c that can not contact with Sealing 8a and be connected to non-tight face 15c and column sealed 15a between and make the two transitional surface 15b seamlessly transitting (referring to enlarged portion in Fig. 6); In like manner, the second seal operation mask body comprises column sealed, non-tight face and transitional surface.Here, described slipper seal refers between Sealing and column sealed and can carry out relative sliding in keeping sealing state.Sealing state between above-mentioned the first Sealing 8a and the first sealed working face 15, and sealing state between the second Sealing 8b and the second sealed working face depends on the sliding position of quantitative cover 1 with respect to center valve rod 3.
Each surperficial structure characteristic and the working principle of explanation formation sealed working face as an example of the first sealed working face 15 example below.
The internal diameter of column sealed 15a in the first sealed working face 15 is slightly less than the external diameter of the first Sealing 8a, thereby can form sealing with the first Sealing 8a; And column sealed 15a internal diameter in the axial direction equates, thereby make the first Sealing 8a can axially sliding along column sealed 15a, and in sliding process, keep the sealing state between the two, the first Sealing 8a can realize slipper seal with column sealed 15a.
The so-called non-tight face 15c that can not contact with Sealing 8a at least partly refers to that whole non-tight face 15c can not form sealing with the first Sealing 8a; Or at least a portion in this non-tight face 15c can not form sealing with the first Sealing 8a, for example that part surface away from column sealed 15a on this non-tight face 15c is separated with the first Sealing 8a.So just can guarantee to be slipped over after non-tight face 15c by column sealed 15a as the first Sealing 8a, make the first Sealing 8a and the first sealed working face 15 depart from sealing state.In the present embodiment, non-tight face 15c is conical surface, and this conical surface is larger away from the diameter of one end of column sealed 15a, and this conical surface is less and roughly equal with the diameter of column sealed 15a near the diameter of one end of column sealed 15a.The first Sealing 8a is before entering column sealed 15a, can first touch non-tight face 15c and carry out relative sliding with non-tight face 15c, in this process, non-tight face 15c can gradually reduce the first Sealing 8a external diameter and the first Sealing 8a is alignd with column sealed 15a, thereby the scope that makes the first Sealing 8a enter smoothly transitional surface 15b and then to enter column sealed 15a.In the time that the first Sealing 8a skids off column sealed 15a and slides to gradually non-tight face 15c, the first Sealing 8a and the first sealed working face 15 depart from sealing state.
The structure that it is pointed out that above-mentioned primary sealing area is not limited to this.For example, non-tight face wherein can also be the curved surface of multiple other shapes such as parabola or the plane vertical with the axis of column sealed.Particularly, in the time adopting parabola as non-tight face, can make one end that this parabola internal diameter is less be connected with transitional surface, sliding process and conical surface between Sealing and this parabola are similar; In the time adopting the plane vertical with the axis of column sealed as non-tight face, this whole plane all can not contact with Sealing, and Sealing will be separated with sealed working face after being skidded off by transitional surface immediately; Now, transitional surface will play gradually reduce Sealing and guide seal and column sealed in the face of neat effect; In the time that the length of transitional surface and radian are all enough large, Sealing can depart from sealing state within the scope of transitional surface, thereby can omit non-tight face.In addition, can also adopt some buses is that the surface of revolution of curve is as non-tight face, as long as the internal diameter on this non-tight face be gradually change (here, described gradually changing only refers to increase or diminishing variation gradually), and curved surface can not contact with Sealing at least partly.
The above-mentioned demand chamber that is arranged on two Sealings between quantitative cover 1 and center valve rod 3 and the internal surface of the quantitative cover 1 between two Sealings and the outer surface of center valve rod 3 and jointly surrounds quantitative valve provided by the invention, the volume of this demand chamber is by the flow that determines that quantitative valve discharges when each the unlatching.
Quantitative valve provided by the invention specifically comprised quantitatively in when work, three main process of opening and closing, these three main process be by quantitatively overlap 1 and center valve rod 3 between the position relationship of relative sliding determine.The working procedure of this quantitative valve will be described in detail below.
Refer to Fig. 4, in the time there is no External Force Acting in quantitative cover 1, quantitative valve is in natural closed condition.The lower surface of the Sealing fixed cover 4 on center valve rod 3 contacts with the upper surface that quantitatively overlaps the limited part 14 in 1, the first Sealing 8a contacts with column sealed 15a of the first sealed working face 15 and in sealing state, now the second Sealing 8b does not contact with the second sealed working face, thereby makes demand chamber be connected and be full of fluid with described fluid source.Thereby completely cut off and stop fluid outwards to discharge by the first Sealing 8a and column sealed sealing configuration that 15a formed between the passage 21 of demand chamber and spool 2 inside.
Refer to Fig. 5, quantitatively cover 1 and spool 2 under external force Compress Spring 7 start to slide with valve core spring 6 relative center valve rod 3, the first Sealing 8a slide along column sealed 15a of the first sealed working face 15 to transitional surface 15b direction and still with column sealed 15a maintenance sealing state; The second Sealing 8b gradually by the non-tight of the second sealed working face towards transitional surface and column sealed slip, now demand chamber and fluid source are isolated, quantitative valve enters quantitative state, the fluid entering in demand chamber during in closed condition at the quantitative valve shown in Fig. 4 is maintained in demand chamber,, in demand chamber, maintain the fluid that volume equates with demand chamber volume.
Refer to Fig. 6, spool 2 continues under external force Compress Spring 7 and valve rod spring 6 relative center valve rod 3 with quantitative cover 1 and continues to slide, the second Sealing 8b along column sealed of the second sealed working face slide and with column sealed maintenance sealing state; The first Sealing 8a slides and finally departs from the first sealed working face 15 and no longer formation sealing to transitional surface 15b and the non-tight face 15c of the first sealed working face 15 gradually from column sealed 15a of the first sealed working face 15.Now quantitative valve enters opening state, remains on fluid in demand chamber and outwards discharge via the upper inside surface of quantitative cover 1 and the passage 21 of spool 2 inside successively in the time of the quantitative state shown in Fig. 5.
After external force is cancelled, spring 7 and valve rod spring 6 elastic potential energy compressed and that produce in quantitative valve opening process is converted into the thrust that acts on quantitative cover 1 lower end.Quantitatively cover 1 moves upward fast together with spool 2 until spool 2 touches the end face of valve body 5 inside under the effect of this elastic force, center valve rod 3 also under the effect of valve rod spring 6 with respect to quantitative cover 1 down sliding until Sealing fixed cover 4 contact with the limited part 14 on quantitative cover 1, thereby make quantitative valve return to the closed condition shown in Fig. 4.In this process, the first Sealing 8a slips over non-tight face 15c, the transitional surface 15b of the first sealed working face 15 successively, and final and column sealed 15a forms sealing state; The second Sealing 8b slips over column sealed of the second sealed working face, transitional surface and non-tight face successively, and finally departs from non-tight face and no longer form sealing.In whole process, quantitatively overlap the glide direction of 1 relative center valve rod 3 and the relative sliding opposite direction in quantitative valve opening process, and finally make quantitative valve close.
Referring to Fig. 7, is the sectional view of quantitative valve the second specific embodiment provided by the invention.It is different that the difference of the first specific embodiment shown in the present embodiment and above-mentioned Fig. 3 to Fig. 6 is to be arranged on the setting position of Sealing 9.Particularly, quantitatively cover 1 outer surface has a step surface upwards, this step surface is roughly equal to the degree of depth of quantitatively overlapping the distance of 1 upper-end surface and the sleeve-like configuration of spool 2 bottoms, after spool 2 being socketed in to the outer surface on top of quantitative cover 1, space between the lower end surface of spool 2 and this step surface is just being used on installs Sealing 9, quantitatively the lower end surface of cover 1 is at the pressure-acting of spring 7, Sealing 9 is pressed on the lower end of spool 2, thereby guarantees the sealing between the internal surface of spool 2 bottoms and the outer surface on quantitative cover 1 top.In addition, in the present embodiment, the structure of quantitative valve and working principle are all similar with above-mentioned the first specific embodiment, therefore repeat no more.
Referring to Fig. 8, is the sectional view of the third specific embodiment of quantitative valve provided by the invention.The difference of the first specific embodiment shown in the present embodiment and above-mentioned Fig. 3 to Fig. 6 is, on the internal surface of the quantitative cover 1 in the present embodiment, limited part is not set, and the structure of center valve rod 3 has larger variation.First, center valve rod 3 has omitted valve rod spring fitting portion, but is fixed together and forms an overall structure with the bottom surface of valve body 5.Concrete mode is, a circular valve rod fitting seat 22 is set on the bottom surface of valve body 5 inside, and the internal diameter that makes this circular valve rod fitting seat 22 is slightly less than the diameter of valve rod 3 bottoms, described center, thereby center valve rod 3 is inserted in this valve rod fitting seat 22 in the mode of interference fit; And, on the sidewall of valve rod fitting seat 22, be provided with a circle groove, groove location on the valve rod 3 of Er center in a corresponding described valve rod fitting seat 22 and circle flange is set, or, on the sidewall of described valve rod fitting seat 22, flange is set, simultaneously on the valve rod 3 of described center the lugs position in corresponding described valve rod fitting seat 22 and arrange can with the close-fitting groove of described flange; Like this, in the time that center valve rod 3 inserts valve rod fitting seat 22, the flange being arranged on center valve rod 3 just in time can be stuck in the groove of valve rod fitting seat 22 and achieve a fixed connection.In addition, the first Sealing 8a in this enforcement and the second Sealing 8b are all directly installed on center valve rod 3 and Sealing fixed cover and limited location snap ring are no longer set, and, because the present embodiment Zhong Jiang center valve rod 3 is fixed on the bottom of valve body 5, therefore valve rod spring can be omitted.It is pointed out that and the present embodiment Zhong center valve rod 3 can also be arranged to and the integrated structure of valve body 5.
Seen from the above description, the present embodiment is for several embodiments described in above-mentioned Fig. 3 to Fig. 7, omit multiple structures and the parts such as limited part, valve rod spring, valve rod spring fitting portion, Sealing fixed cover and limited location snap ring, thereby effectively simplified overall structure and the assembly process of quantitative valve.
Working principle and ON/OFF process as for the quantitative valve described in the present embodiment are all similar with above-mentioned the first specific embodiment, therefore repeat no more.
See also Fig. 9 to Figure 11, be followed successively by the sectional view of the demand chamber structure adopting in the 4th to the 6th kind of specific embodiment of quantitative valve provided by the invention.In the 4th to the 6th embodiment, because the structure of the other parts except demand chamber is all similar with above-mentioned first to three kind of specific embodiment, therefore omitted in the accompanying drawings, and repeated no more.The structural feature of the demand chamber shown in explanatory drawing 9 to Figure 11 successively below.
Refer to Fig. 9, the present embodiment and above-mentioned first to three kind of embodiment's difference is, the first Sealing 8a and the second Sealing 8b are all arranged on the inwall of quantitative cover 1, and accordingly, the first sealed working face 15 and the second sealed working face 16 are all arranged on the valve rod of center.Because the setting position of Sealing and sealed working face changes, therefore, in the present embodiment, the order that arranges of in sealed working face column sealed, transitional surface and non-tight face is adjusted thereupon, specifically should according to the glide direction of the relative center of quantitative cover valve rod and in this glide direction required sealing state determine, the variation principle of following Figure 10 and sealed working face in Figure 11 is consistent with the present embodiment.
Refer to Figure 10, the present embodiment and above-mentioned first to fourth kind of embodiment's difference is, the first Sealing 8a and the second sealed working face 16 are arranged on center valve rod 3, and accordingly, the first sealed working face 15 and the second Sealing 8b are arranged on the inwall of quantitative cover 1.
Refer to Figure 11, the present embodiment and above-mentioned first to five kind of embodiment's difference is, the first sealed working face 15 and the second Sealing 8b are arranged on center valve rod 3, and accordingly, the first Sealing 8a and the second sealed working face 16 are arranged on the inwall of quantitative cover.
It is pointed out that the Sealing adopting in each embodiment of the quantitative valve that the invention described above provides can be seal ring, can be also stuffing box packing, and adopt other sealing material that can realize slipper seal all can.
In sum, in quantitative valve provided by the invention, quantitatively between the valve rod of Tao He center, two groups of Sealing and sealed working faces that can form slipper seal are being set, change the sealing state of above-mentioned two groups of Sealings and sealed working face by changing the relative position of quantitative Tao Yu center valve stem slides, and then control quantitative, the opening and closing process of quantitative valve.Above-mentioned sealed working face is formed by column sealed, transitional surface and the smooth connection of non-tight face, thereby avoids occurring on sealed working face seamed edge or burr.Therefore,, when Sealing and sealed working face carry out relative sliding and realize sealing or depart from the process of sealing state, Sealing can not be subject to any cutting wearing and tearing, thereby can effectively extend the working life of Sealing, and then extends the working life of quantitative valve.In addition, quantitative valve provided by the invention, because the structure of demand chamber depends primarily on the structure of quantitative Tao He center valve rod, therefore, no longer be subject to many restrictions of demand chamber size and body size for the selection of spring size, and can freely select the suitable spring of fatigue strength; And in some preferred embodiment, can also select the structure of dual spring, therefore, the spring the invention provides in quantitative valve has longer working life, and then has effectively extended the working life of quantitative valve.
Be understandable that, above mode of execution is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (15)
1. a quantitative valve, be used for controlling fluid source outside release fluids quantitatively, described quantitative valve comprises the valve body being connected with fluid source, on described valve body, be provided with a spool through described valve body, described valve core inside has the passage for outside release fluids, it is characterized in that, in described valve body, be also provided with quantitative cover, center valve rod and spring
The outer surface on the top of described quantitative cover and described spool internal surface are tightly connected; Described spring is arranged between described quantitative cover lower end and the bottom surface of described valve inner; Described quantitative cover and described spring housing are contained in the outside of described center valve rod, and center valve stem slides relatively;
Near the upper inner of described quantitative cover He on the valve rod of described center, be respectively arranged with the first Sealing and the first sealed working face, near the lower end of described quantitative cover internal surface He on the valve rod of described center, be respectively arranged with the second Sealing and the second sealed working face; Described sealed working face comprises and can form column sealed of slipper seal, the non-tight face that can not contact with described Sealing and be connected to described non-tight face and between column sealed and the transitional surface that the two is seamlessly transitted at least partly with described Sealing; The internal surface of described two Sealings and the described quantitative cover between two Sealings and the outer surface of described center valve rod surround the demand chamber of quantitative valve jointly,
Between the valve rod of described quantitative Tao Yu center described in the determining positions of relative sliding quantitative valve quantitatively, opening and closing process, wherein:
In the time there is no External Force Acting in described quantitative cover, quantitative valve is closed, the first Sealing contacts with the column sealed face of the first sealed working face and in sealing state, the second Sealing does not contact with the second sealed working face, and the fluid in described fluid source is full of described demand chamber;
When described when being quantitatively enclosed within described in External Force Acting lower compression spring relatively described center valve rod and starting to slide, the first Sealing slides and still in sealing state towards transitional surface direction along the column sealed of the first sealed working face; The second Sealing gradually by the non-tight of the second sealed working face towards transitional surface and column sealed slip, now described quantitative valve enters quantitative state, the fluid equating with described demand chamber volume is maintained in demand chamber;
In the time that described quantitative cover continues under external force to compress described spring relatively described center valve rod and continues to slide, the second Sealing slides and still in sealing state along column sealed of the second sealed working face; The first Sealing slides and finally departs from the first sealed working face and no longer formation sealing to transitional surface and the non-tight face of the first sealed working face gradually from the column sealed face of the first sealed working face, now described quantitative valve enters opening state, and the fluid remaining in described demand chamber outwards discharges via the passage of described valve core inside;
After external force is cancelled, under the described elastic force effect that is quantitatively enclosed within described spring, there is the relative sliding contrary with glide direction when the quantitative valve opening process with described center valve rod, and finally make quantitative valve close.
2. quantitative valve according to claim 1, is characterized in that, described the first Sealing and the second Sealing are all arranged on the valve rod of described center, and accordingly, described the first sealed working face and the second sealed working face are all arranged on the inwall of described quantitative cover.
3. quantitative valve according to claim 1, is characterized in that, described the first Sealing and the second Sealing are all arranged on the inwall of described quantitative cover, and accordingly, described the first sealed working face and the second sealed working face are all arranged on the valve rod of described center.
4. quantitative valve according to claim 1, is characterized in that, described the first Sealing and the second sealed working face are arranged on the valve rod of described center, and accordingly, the first sealed working face and described the second Sealing are arranged on the inwall of described quantitative cover.
5. quantitative valve according to claim 1, is characterized in that, described the first sealed working face and the second Sealing are arranged on the valve rod of described center, and accordingly, the first Sealing and described the second sealed working face are arranged on the inwall of described quantitative cover.
6. quantitative valve according to claim 1, is characterized in that, also comprises valve rod spring, in the lower end of described center valve rod, valve rod spring fitting portion is set, and described valve rod spring fitting is between the lower end of described quantitative cover and described valve rod spring fitting portion.
7. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that the described limited part that is provided with the sliding stroke for limiting the relatively described center of described quantitative cover valve rod that quantitatively puts.
8. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that, described non-tight face is conical surface, plane or the parabola vertical with the axis of described column sealed.
9. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that, the lower end of described center valve rod is fixedly connected with described valve body; Or described center valve rod and described valve body are one-body molded.
10. quantitative valve according to claim 9, it is characterized in that, on the bottom surface of described valve inner, arrange one can with the valve rod fitting seat of described center valve rod interference fit, and on the sidewall of described valve rod fitting seat, groove is set, simultaneously on the valve rod of described center the groove location in corresponding described valve rod fitting seat and arrange can with the close-fitting flange of described groove; Or, on the sidewall of described valve rod fitting seat, flange is set, simultaneously on the valve rod of described center the lugs position in corresponding described valve rod fitting seat and arrange can with the close-fitting groove of described flange; Described center valve rod inserts after described valve rod fitting seat, by closely cooperating and make described center valve rod and described valve body form an entirety between described flange and groove.
11. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that, described valve body is provided with the interface being connected with described fluid source, uses so that the fluid in described fluid source enters described valve inner.
12. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that, between described spool and described valve body, be provided with spool guide card, seal spool part and retaining ring, described spool can carry out sealing slip with described valve body under the guiding of described spool guide card and seal spool part, and described retaining ring is in order to fixedly mount described spool guide card and seal spool part.
13. according to the quantitative valve described in any one in claim 1 to 6, it is characterized in that, the outer surface on the internal surface of described spool bottom and described quantitative cover top connects together by the mode of interference fit, and be provided with Sealing at described spool with between quantitatively overlapping, in order to guarantee the sealing between the outer surface on top of described quantitative cover and the internal surface of the bottom of described spool.
14. quantitative valves according to claim 13, is characterized in that, have downward step surface at described valve core inside, and described Sealing is arranged between the downward step surface and the upper-end surface of described quantitative cover of described valve core inside.
15. quantitative valves according to claim 13, is characterized in that, have step surface upwards in described quantitative cover outside, and described Sealing is arranged between described quantitative cover outside step surface upwards and the lower end surface of described spool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010163291.8A CN102235527B (en) | 2010-04-30 | 2010-04-30 | Metering valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010163291.8A CN102235527B (en) | 2010-04-30 | 2010-04-30 | Metering valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102235527A CN102235527A (en) | 2011-11-09 |
| CN102235527B true CN102235527B (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010163291.8A Expired - Fee Related CN102235527B (en) | 2010-04-30 | 2010-04-30 | Metering valve |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2996827B1 (en) | 2012-10-12 | 2014-10-31 | Rexam Healthcare La Verpillier | DOSING VALVE FOR DISTRIBUTING AN AEROSOL |
| FR2993250B1 (en) * | 2012-10-12 | 2014-08-01 | Rexam Healthcare La Verpillier | DOSING VALVE FOR DISTRIBUTING AN AEROSOL |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302297B1 (en) * | 2000-09-06 | 2001-10-16 | Illinois Tool Works Inc. | External metering valve for a fuel cell |
| AU2008100690A4 (en) * | 2008-07-25 | 2008-08-28 | Magnum Manufacturing Pty Ltd | Dose metering valve for aerosol containers |
| CN101358570A (en) * | 2007-07-30 | 2009-02-04 | C·R·F·索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | Fuel injector with balanced metering servovalve, for an internal combustion engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004034626A1 (en) * | 2004-06-17 | 2006-01-12 | Seaquist Perfect Dispensing Gmbh | Dosing valve and device for dispensing a preferably cosmetic liquid |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6302297B1 (en) * | 2000-09-06 | 2001-10-16 | Illinois Tool Works Inc. | External metering valve for a fuel cell |
| CN1342856A (en) * | 2000-09-06 | 2002-04-03 | 伊利诺斯器械工程公司 | Outer metering valve for fuel tank |
| CN101358570A (en) * | 2007-07-30 | 2009-02-04 | C·R·F·索奇埃塔·孔索尔蒂莱·佩尔·阿齐奥尼 | Fuel injector with balanced metering servovalve, for an internal combustion engine |
| AU2008100690A4 (en) * | 2008-07-25 | 2008-08-28 | Magnum Manufacturing Pty Ltd | Dose metering valve for aerosol containers |
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| CN102235527A (en) | 2011-11-09 |
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