CN102235527A - Metering valve - Google Patents
Metering valve Download PDFInfo
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- CN102235527A CN102235527A CN2010101632918A CN201010163291A CN102235527A CN 102235527 A CN102235527 A CN 102235527A CN 2010101632918 A CN2010101632918 A CN 2010101632918A CN 201010163291 A CN201010163291 A CN 201010163291A CN 102235527 A CN102235527 A CN 102235527A
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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 quantitative valve that is used for the outwards quantitative release fluids of control flows body source.
Background technique
Quantitative valve is the extraordinary valve that a kind of can fluid sources each flow that outwards discharges is accurately controlled.Quantitative valve purposes in daily life is very extensive, such as being provided with quantitative valve in the products such as common spray, fuel type nail gun.
See also Fig. 1, wherein show name and be called a kind of quantitative valve that be used for fuel nail gun that U. S. Patent provided of " External metering valve for a fuelcell " patent No. for US6302297.This quantitative valve comprises valve body 16 and the spool 32, spring 40, Sealing 46 and the Sealing 44 that are arranged in the valve body 16.Wherein, fuel pot 12 is connected with the lower end of valve body 16 and then is communicated with the spring housing 29 and the demand chamber 30 of valve body 16 inside.Spring 40 is arranged in the spring housing 29, and spool 32 ends are connected with spring 40 and run through demand chamber 30 and spring housing 29.The center of spool 32 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: when not having external force to act on spool 32, the liquefied gas as fuel in the 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 the demand chamber 30 is held; When spool 32 continues to pass Sealing 46 and after entering the zone of demand chamber 30, liquefied gas as fuel is released via through hole 42 and fluid passage 41 in the demand chamber 30 to spring 40 1 lateral movements until the vent 42 of spool 32 sidewalls under external force.
Above-mentioned quantitative valve of the prior art can play the effect of release fluids quantitatively to a certain extent, but there is following defective inevitably in it:
One, in the working procedure of above-mentioned quantitative valve, the inner hole surface generation reciprocating friction of vent on the spool sidewall and Sealing 46, Sealing 46 are easy to be caused wearing and tearing by the edge cuts of the through hole on the spool sidewall 42.Evidence, diameter is that the spool sidewall through hole of 0.4mm is under the situation of no any burr, after being the to-and-fro motion of Sealing experience 3000 times to 5000 times of 1mm with thickness, 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 is proof simultaneously, when the diameter of spool side through hole increases or during when a small amount of injection moulding burr of the marginal existence of through hole, the speed of seal fails will be more obvious.As seen, the suffered cutting wearing and tearing of Sealing are the major reasons that cause its inefficacy, and the actual life of Sealing further will influence the working life of quantitative valve, therefore, the quantitative valve that above-mentioned prior art provided exists because of Sealing is subjected to cutting wearing and tearing and causes valve too short shortcoming in working life.
They are two years old, the structure of demand chamber mainly is made of jointly spool and part valve body structure in the above-mentioned quantitative valve, and therefore, this part valve body structure that constitutes demand chamber will determine the volume size of demand chamber, if will obtain the less demand chamber of volume, just must control the internal diameter of this part valve body structure.But, assembling during spring owing to spring need be passed this demand chamber, this just makes the optional size of spring external diameter be severely limited, when selecting spring, spool is resetted fast and have the enough rigidity size of control spring strictly again, thereby cause final selected spring external diameter very little but rigidity is very strong, because this spring is worked being higher than under the stress of himself fatigue strength all the time, thereby be severely limited the fatigue life of spring.When spring can't make spool reset fast during near its fatigue life, at this moment, therefore quantitative valve will lose efficacy.As seen, the quantitative valve that above-mentioned prior art provided exists and causes valve too short shortcoming in working life because of spring fatigue intensity can't satisfy the 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 long working life.
For this reason, the invention provides a kind of quantitative valve, be used for the outside quantitatively release fluids of control flows body source, described quantitative valve comprises the valve body that is connected with fluid source, valve body is provided with a spool that passes valve body, and valve core inside has the passage that is used for outside release fluids.Wherein, also be provided with quantitative cover, center valve rod and spring in valve body, quantitatively the outer surface and the spool internal surface on the top of cover are tightly connected; Spring is arranged between the bottom surface of quantitative cover lower end and valve inner; Quantitatively cover and spring housing are contained in the outside of center valve rod, and center valve stem slides relatively; Be respectively arranged with first Sealing and first sealed working face near the upper inner of quantitative cover and on the valve rod of center, be respectively arranged with second Sealing and second sealed working face near the lower end of quantitatively overlapping internal surface with on the valve rod of center; Sealed working face comprise can and Sealing form column sealed of slipper seal, to small part can not and the contacted non-tight face of Sealing and be connected the non-tight face and between column sealed and the transitional surface that the two is seamlessly transitted; The internal surface of two Sealings and the quantitative cover between two Sealings and the outer surface of center valve rod surround the demand chamber of quantitative valve jointly.
Wherein, quantitative, the opening and closing process of the determining positions quantitative valve of slide relative between quantitative cover and the center valve rod, wherein: quantitative valve is not closed when having external force to act on quantitative cover, first Sealing contacts with the column sealed face of first sealed working face and is in sealing state, second Sealing does not contact with second sealed working face, and the fluid in the fluid source is full of demand chamber; When quantitatively being enclosed within external force effect lower compression spring and the center valve rod begins to slide relatively, first Sealing also still is in sealing state along column sealed the slip towards the transitional surface direction of first sealed working face; Second Sealing gradually by the non-tight of second sealed working face towards transitional surface and column sealed slip, this moment, quantitative valve entered quantitative state, the fluid that equates with the demand chamber volume is maintained in the demand chamber; When quantitative cover continued the valve rod continuation slip of the also relative center of pressure spring under external force, second Sealing also still was in sealing state along column sealed slip of second sealed working face; First Sealing slides also final disengaging first sealed working face and no longer forms sealing to the transitional surface and the non-tight face of first sealed working face gradually from the column sealed face of first sealed working face, this moment, quantitative valve entered opening state, and the fluid that remains in the demand chamber outwards discharges via the passage of valve core inside; After external force was cancelled, the elastic force effect that quantitatively is enclosed within spring took place with the center valve rod down and the opposite slide relative of glide direction when the quantitative valve opening process, and quantitative valve is closed.
Wherein, first Sealing and second Sealing all are arranged on the valve rod of center, and accordingly, first sealed working face and second sealed working face all are arranged on the inwall of quantitative cover.
Wherein, first Sealing and second Sealing all are arranged on the inwall of quantitative cover, and accordingly, first sealed working face and second sealed working face all are arranged on the valve rod of center.
Wherein, first Sealing and second sealed working face are arranged on the valve rod of center, and accordingly, first sealed working face and second Sealing are arranged on the inwall of quantitative cover.
Wherein, first sealed working face and second Sealing are arranged on the valve rod of center, and accordingly, first Sealing and second sealed working face are arranged on the inwall of quantitative cover.
Wherein, also comprise the valve rod spring, valve rod spring assembly department is set in the lower end of center valve rod, the valve rod spring is installed between the lower end and valve rod spring assembly department of quantitative cover.
Wherein, quantitatively cover is provided with the limited part that is used to limit the slide relative scope between quantitative cover and the center valve rod.
Wherein, described non-tight face be conical surface, with the plane or the parabola of described column sealed axis normal.
Wherein, on the bottom surface of valve inner, be provided with one can with the valve rod fitting seat of center valve rod interference fit, and on the sidewall of valve rod fitting seat, groove is set, simultaneously on the valve rod of center the groove location in the corresponding valve rod fitting seat and be provided with can with the close-fitting flange of groove; Perhaps, on the sidewall of described valve rod fitting seat, flange is set, simultaneously on the valve rod of described center the lugs position in the corresponding described valve rod fitting seat and be provided with can with the close-fitting groove of described flange; After the center valve rod inserts the valve rod fitting seat, by closely cooperating and make integral body of center valve rod and valve body formation between flange and the groove.
Wherein, valve body is provided with the interface that is connected with fluid source, uses so that the fluid in the fluid source enters valve inner.
Wherein, be provided with spool guide card, seal spool spare and retaining ring between spool and valve body, spool can carry out sealing with valve body and slide under the guiding of spool guide card and seal spool spare, and retaining ring is in order to fixed installation spool guide card and seal spool spare.
Wherein, the outer surface on the top of the internal surface of the bottom of spool and quantitative cover connects together by the mode of interference fit, and at spool with quantitatively be provided with Sealing between the cover, in order to the sealing between the internal surface of the outer surface of guaranteeing quantitatively to overlap top and spool bottom.Wherein, have downward step surface at valve core inside, Sealing is arranged between the downward step surface and the quantitative upper-end surface of overlapping of valve core inside.Wherein, quantitatively overlapping the outside step surface upwards that has, Sealing is arranged between the lower end surface of outside step surface that makes progress of quantitative cover and 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 the valve body, quantitative cover, center valve rod and spring, wherein, quantitatively cover is sleeved on the valve rod of center slidably, quantitatively be provided with two groups of Sealing and sealed working faces that can cooperatively interact and realize slipper seal between cover and the center valve rod, 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, by the relative position that changes quantitative cover and center valve stem slides realize quantitative valve quantitatively, the 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 to be that mild transition connects between the each several part surface on the sealing working surface, thereby can avoid occurring on the sealed working face tangible seamed edge or burr, like this, in terms of existing technologies, Sealing among the present invention realize sealing cooperating with sealed working face or break away from the process of sealing be difficult for being cut/wear and tear, therefore, the problem that quantitative valve provided by the invention can effectively avoid Sealing to lose efficacy because of the cutting wearing and tearing, thus have longer working life.
They are two years old, quantitative valve provided by the present invention, its demand chamber is quantitatively between cover and the center valve rod, the size of demand chamber depends primarily on the structure of quantitative cover and center valve rod, and the size of valve inner be there is no too strict requirement, thereby when selecting the outside dimension of spring, no longer be subjected to the restriction of cavity size; And spring is arranged at the lower end of quantitative cover, and demand chamber is positioned at the inside of quantitative cover, thereby also no longer is subjected to the restriction of demand chamber size when selecting the outside dimension of spring.Therefore, the spring that quantitative valve provided by the present invention can select size and rigidity all to suit according to the working stress of reality, thereby overcome the problem of the spring fatigue strength deficiency that exists in the prior art, and then can effectively prolong the working life of quantitative valve.
Description of drawings
Fig. 1 is the structure sectional view of existing a kind of quantitative valve;
Fig. 2 is a kind of shape schematic representation of common liquefied gas tank;
Fig. 3 a to 3d is followed successively by stereogram, plan view, right elevation and the rear view of first kind of specific embodiment of quantitative valve provided by the invention;
Fig. 4 is the sectional view along A-A cross section among Fig. 3 b embodiment illustrated in fig. 3, and the quantitative valve among this figure is in closed condition;
Sectional view when Fig. 5 is in quantitative state for quantitative valve embodiment illustrated in fig. 4;
Sectional view when Fig. 6 is in opening state for quantitative valve embodiment illustrated in fig. 4;
Fig. 7 is the sectional view of second kind of 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;
Fig. 9 is the sectional view of the demand chamber structure that adopted in the 4th kind of specific embodiment of quantitative valve provided by the invention;
Figure 10 is the sectional view of the demand chamber structure that adopted in the 5th kind of specific embodiment of quantitative valve provided by the invention; And
Figure 11 is the sectional view of the demand chamber structure that adopted in the 6th kind of specific embodiment of quantitative valve provided by the invention.
Embodiment
For making those skilled in the art understand technological scheme of the present invention better, quantitative valve provided by the invention is described in detail below in conjunction with accompanying drawing.
See also Fig. 3 a to 3d, be the external structure of first kind of specific embodiment of quantitative valve provided by the invention.This quantitative valve is introduced the fluid in the fluid source (for example, liquefied gas tank shown in Figure 2) in its valve body earlier, afterwards the fluid that enters in its valve body is carried out quantitatively via the passage of valve core inside the release of fluid of predetermined amount of flow being gone out then.
See also Fig. 4 to Fig. 6, close for quantitative valve provided by the invention is in respectively, quantitatively and the sectional view during opening state.For ease of structure and the position relation of describing each part of quantitative valve, description to relevant orientation in this specification is a benchmark with direction shown in the drawings all, for example, the highest end in position that quantitatively puts when quantitatively the upper end of cover promptly is meant quantitative valve placed according to direction shown in the 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 the 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 thinner valve rod, and this valve stem part is installed in the mounting hole of seal spool spare 10, spool guide card 11, and retaining ring 12 is fixed on seal spool spare 10 and spool guide card 11 upper end of valve body 5.Spool 2 can be done under the guiding of the mounting hole of spool guide card 11 and endwisely slip and circumferentially rotate, seal spool spare 10 can prevent fluid in the valve body 5 between spool 2 and spool guide card 11 the gap and leak.Spool 2 inside have the passage 21 that is used for release fluids, and the fluid that enters in the 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 sleeve-like configuration that diameter is embedded in valve body 5 inside more greatly and fully in the spool 2 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.Be Spielpassung between the outer surface of the sleeve-like configuration of spool 2 bottoms and the valve body 5, the internal surface of this sleeve-like configuration connects together with the mode of interference fit and the quantitative outer surface on the top of cover 1.Has a downward step surface in the inside of this sleeve-like configuration, between the inner downward step surface of the upper-end surface of quantitative cover 1 and spool 2, be provided with a Sealing 9, in order to the sealing between the internal surface of the bottom of the outer surface that guarantees the quantitative top of cover 1 and spool 2.Spring 7 is arranged between the bottom surface of the lower end surface of quantitative cover 1 and valve body 5 inside, and provides elastic force for quantitative cover 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 be positioned at spring 7 inside, and the lower end of center valve rod 3 is provided with valve rod spring assembly department 17, and valve rod spring 6 is arranged on this valve rod spring assembly department 17 and quantitatively overlaps between 1 the 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 quantitative cover 1 upper inner first sealed working face 15 be arranged on the center valve rod 3 can with the first suitable Sealing 8a of first sealed working face 15; And, be arranged near second sealed working face the quantitative cover 1 internal surface lower end and be arranged on the center valve rod 3 can with the second suitable Sealing 8b of second sealed working face.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 the position of center valve rod 3 near the top, above Sealing fixed cover 4, be provided with spacing snap ring 13, in order to limit the axial position of Sealing fixed cover 4 on center valve rod 3; The second Sealing 8b then directly is sleeved in the mounting groove on the center valve rod 3.The stroke that the formulation amount of exceeding cover 1 slides 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 first sealed working face 15 and second sealed working face.
Above-mentioned first sealed working face 15 specifically also comprises: can and Sealing 8a form slipper seal column sealed 15a, to small part can not and Sealing 8a contacted non-tight face 15c and be connected non-tight face 15c and column sealed 15a between and make the two transitional surface 15b that seamlessly transits (seeing enlarged portion among Fig. 6 for details); In like manner, the second seal operation mask body comprises column sealed, non-tight face and transitional surface.Here, described slipper seal is meant between Sealing and column sealed and can carries out slide relative when keeping sealing state.Sealing state between the above-mentioned first Sealing 8a and first sealed working face 15, and the sealing state between the second Sealing 8b and second sealed working face depends on the sliding position of quantitative cover 1 with respect to center valve rod 3.
Be each surperficial structure characteristic and the working principle that the example explanation constitutes sealed working face with first sealed working face 15 below.
The internal diameter of column sealed 15a in 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 keep the sealing state between the two in sliding process, promptly the first Sealing 8a can realize slipper seal with column sealed 15a.
What is called to small part can not be meant that whole non-tight face 15c can not form sealing with the first Sealing 8a with the contacted non-tight face of Sealing 8a 15c; Or at least a portion among this non-tight face 15c can not form sealing with the first Sealing 8a, and 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 after the first Sealing 8a slips over non-tight face 15c by column sealed 15a, make the first Sealing 8a and first sealed working face 15 break away from sealing state.In the present embodiment, non-tight face 15c is a conical surface, and this conical surface is bigger away from the diameter of the end of column sealed 15a, this conical surface near the diameter of the end of column sealed 15a less and with the diameter of column sealed 15a about equally.The first Sealing 8a is before entering column sealed 15a, can at first touch non-tight face 15c and carry out slide relative 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 transitional surface 15b smoothly and then to enter column sealed 15a.When the first Sealing 8a skidded off column sealed 15a and slides to non-tight face 15c gradually, the first Sealing 8a and first sealed working face 15 broke away from sealing state.
The structure that it is pointed out that above-mentioned primary sealing area is not limited thereto.For example, non-tight face wherein can also be parabolic or with the curved surface of multiple other shapes such as plane of column sealed axis normal.Particularly, when adopting parabola as the non-tight face, the less end of this parabola internal diameter is connected with transitional surface, sliding process and conical surface between Sealing and this parabola are similar; When adopting plane with column sealed axis normal as the non-tight face, this whole plane all can not contact with Sealing, and promptly Sealing will be separated with sealed working face after being skidded off by transitional surface immediately; At this moment, transitional surface will play gradually reduce Sealing and guide seal and column sealed in the face of neat effect; When the length of transitional surface and radian were all enough big, Sealing can break away from sealing state in the transitional surface scope, thereby can omit the non-tight face.In addition, can also adopt some buses is that the surface of revolution of curve is as the non-tight face, as long as the internal diameter on this non-tight face be gradually change (here, described gradually change only be meant increase gradually or diminishing variation), and can not contact with Sealing to the small part curved surface and to get final product.
The above-mentioned internal surface that is arranged on two Sealings between quantitative cover 1 and the center valve rod 3 and the quantitative cover 1 between two Sealings becomes the demand chamber of quantitative valve provided by the invention with the outer surface one common peripheral of center valve rod 3, the volume of this demand chamber will determine the flow that quantitative valve is discharged when each the unlatching.
Quantitative valve provided by the invention the time specifically comprises quantitatively in work, three main processes of opening and closing, these three main processes be the position by slide relative between quantitative cover 1 and the center valve rod 3 concern determined.To describe the working procedure of this quantitative valve below in detail.
See also Fig. 4, when not having external force to act on quantitative cover 1, quantitative valve is in the nature closed condition.The lower surface of the Sealing fixed cover 4 on the 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 first sealed working face 15 and is in sealing state, this moment, the second Sealing 8b did not contact with second sealed working face, thereby demand chamber is connected with described fluid source and was full of fluid.Thereby being completely cut off by the first Sealing 8a and column sealed formed sealing configuration of 15a between the passage 21 of demand chamber and spool 2 inside stops fluid outwards to discharge.
See also Fig. 5, quantitatively cover 1 and spool 2 under external force pressure spring 7 begin to slide with valve core spring 6 and relative center valve rod 3, the first Sealing 8a along column sealed 15a of first sealed working face 15 to transitional surface 15b direction slide and still with column sealed 15a maintenance sealing state; The second Sealing 8b gradually by the non-tight of second sealed working face towards transitional surface and column sealed slip, this moment, demand chamber and fluid source were isolated, quantitative valve enters quantitative state, the fluid that enters when quantitative valve shown in Figure 4 is in closed condition in the demand chamber is maintained in the demand chamber, that is, in demand chamber, maintain the fluid that volume equates with the demand chamber volume.
See also Fig. 6, spool 2 continues pressure spring 7 and valve rod spring 6 and relative center valve rod 3 under external force with quantitative cover 1 and continues to slide, the second Sealing 8b along column sealed of second sealed working face slide and with column sealed maintenance sealing state; The first Sealing 8a slides also final disengaging first sealed working face 15 and no longer forms sealing to the transitional surface 15b and the non-tight face 15c of first sealed working face 15 gradually from column sealed 15a of first sealed working face 15.This moment, quantitative valve entered opening state, and the fluid that remains on when quantitative state shown in Figure 5 in the demand chamber outwards discharges via the passage 21 of the upper inside surface of quantitative cover 1 and spool 2 inside successively.
After external force was cancelled, spring 7 and valve rod spring 6 were compressed in the quantitative valve opening process and the elastic potential energy that produces is converted into the thrust that acts on quantitative cover 1 lower end.Quantitatively cover 1 moves upward fast together with spool 2 under the effect of this elastic force and touches the end face of valve body 5 inside until spool 2, center valve rod 3 is also contacting with the limited part 14 that quantitatively overlaps on 1 until Sealing fixed cover 4 to lower slider with respect to quantitative cover 1 under the effect of valve rod spring 6, thereby makes quantitative valve return to closed condition shown in Figure 4.In this process, the first Sealing 8a slips over non-tight face 15c, the transitional surface 15b of first sealed working face 15 successively, and final and column sealed 15a forms sealing state; The second Sealing 8b then slips over column sealed of second sealed working face, transitional surface and non-tight face successively, and finally breaks away from the non-tight face and no longer form sealing.In the whole process, it is opposite with slide relative direction in the quantitative valve opening process quantitatively to overlap the glide direction of 1 relative center valve rod 3, and quantitative valve is closed.
See also Fig. 7, be the sectional view of second kind of specific embodiment of quantitative valve provided by the invention.Present embodiment and above-mentioned Fig. 3 to the difference of first kind of specific embodiment shown in Figure 6 be to be arranged on Sealing 9 that the position is set is different.Particularly, quantitatively cover 1 outer surface has a step surface that makes progress, this step surface to the degree of depth of the distance of quantitative cover 1 upper-end surface and the sleeve-like configuration of spool 2 bottoms about equally, after the outer surface on the top that spool 2 is socketed in quantitative cover 1, space between the lower end surface of spool 2 and this step surface just is being used on installs Sealing 9, quantitatively the lower end surface of cover 1 is in the pressure effect of spring 7, Sealing 9 is pressed on the lower end of spool 2, thus the sealing between the outer surface on the internal surface of assurance spool 2 bottoms and quantitative cover 1 top.In addition, the structure of quantitative valve and working principle are all similar with above-mentioned first kind of specific embodiment in the present embodiment, therefore repeat no more.
See also Fig. 8, be the sectional view of the third specific embodiment of quantitative valve provided by the invention.The difference of first kind of specific embodiment that present embodiment and above-mentioned Fig. 3 are extremely shown in Figure 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 bigger variation.At first, center valve rod 3 has omitted valve rod spring assembly department, but is fixed together with the bottom surface of valve body 5 and forms an overall structure.Concrete mode is, the valve rod fitting seat 22 of a circle 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, and on center valve rod 3 groove location in the corresponding described valve rod fitting seat 22 and be provided with one the circle flange, perhaps, 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 the corresponding described valve rod fitting seat 22 and be provided with can with the close-fitting groove of described flange; Like this, when center valve rod 3 inserts valve rod fitting seats 22, be arranged in flange on the center valve rod 3 and 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 all are directly installed on the center valve rod 3 and Sealing fixed cover and spacing snap ring no longer are set, and,, therefore the valve rod spring can be omitted owing in the present embodiment center valve rod 3 is fixed on the bottom of valve body 5.It is pointed out that and the center valve rod 3 in the present embodiment can also be arranged to and valve body 5 integrated structures.
By foregoing description as can be known, present embodiment is for the described several embodiments of above-mentioned Fig. 3 to Fig. 7, omit a plurality of structures and parts such as limited part, valve rod spring, valve rod spring assembly department, Sealing fixed cover and spacing snap ring, thereby effectively simplified the 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 first kind of 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 that is adopted in the 4th to the 6th kind of specific embodiment of quantitative valve provided by the invention.In the 4th to the 6th embodiment,, therefore omitted in the accompanying drawings, and repeated no more because the structure of the other parts except that demand chamber is all similar with above-mentioned first to three kind of specific embodiment.Below successively explanatory drawing 9 to the structural feature of demand chamber shown in Figure 11.
See also Fig. 9, present embodiment and above-mentioned first to three kind of embodiment's difference is, the first Sealing 8a and the second Sealing 8b all are arranged on the inwall of quantitative cover 1, and accordingly, first sealed working face 15 and second sealed working face 16 all are arranged on the valve rod of center.Because the position that is provided with of Sealing and sealed working face changes, therefore, in the present embodiment, the order that is provided with of in the 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 on this glide direction required sealing state decide, the variation principle of sealed working face is consistent with present embodiment among following Figure 10 and Figure 11.
See also Figure 10, present embodiment and above-mentioned first to fourth kind embodiment's difference is, the first Sealing 8a and second sealed working face 16 are arranged on the center valve rod 3, and accordingly, first sealed working face 15 and the second Sealing 8b are arranged on the inwall of quantitative cover 1.
See also Figure 11, present embodiment and above-mentioned first to five kind of embodiment's difference is that first sealed working face 15 and the second Sealing 8b are arranged on the center valve rod 3, and accordingly, the first Sealing 8a and second sealed working face 16 are arranged on the inwall of quantitative cover.
It is pointed out that the Sealing that is adopted among each embodiment of the quantitative valve that the invention described above provides can be a seal ring, can be stuffing box packing also, and adopts other sealing material that can realize slipper seal all can.
In sum, in the quantitative valve provided by the invention, quantitatively between cover and the center valve rod 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 the relative position that changes quantitative cover and 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 the sealed working face seamed edge or burr.Therefore, when Sealing and sealed working face carry out slide relative and realize sealing or break away from the process of sealing state, Sealing can not be subjected to any cutting wearing and tearing, thereby can effectively prolong the working life of Sealing, and then prolongs the working life of quantitative valve.In addition, quantitative valve provided by the invention is because the structure of demand chamber depends primarily on the structure of quantitative cover and center valve rod, therefore, no longer be subjected 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 can also select the structure of dual spring in some preferred embodiment, therefore, the spring that the invention provides in the quantitative valve has long working life, and then has prolonged the working life of quantitative valve effectively.
Be understandable that above mode of execution only is the illustrative embodiments that adopts for principle of the present invention is described, yet 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 also are considered as protection scope of the present invention.
Claims (16)
1. quantitative valve, be used for the outside quantitatively release fluids of control flows body source, described quantitative valve comprises the valve body that is connected with fluid source, described valve body is provided with a spool that passes described valve body, described valve core inside has the passage that is used for outside release fluids, it is characterized in that, in described valve body, also be 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 the bottom surface of described quantitative cover lower end and 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;
Be respectively arranged with first Sealing and first sealed working face near the upper inner of described quantitative cover He on the valve rod of described center, be respectively arranged with second Sealing and second sealed working face near the lower end of described quantitative cover internal surface He on the valve rod of described center; Described sealed working face comprise can and described Sealing form column sealed of slipper seal, to small part can not and the contacted non-tight face of described Sealing and be connected described non-tight face and between column sealed and the transitional surface that the two is seamlessly transitted; 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.
2. quantitative valve according to claim 1 is characterized in that, quantitative, the opening and closing process of the described quantitative valve of determining positions of slide relative between described quantitative cover and the center valve rod, wherein:
Quantitative valve is not closed when having external force to act on described quantitative cover, first Sealing contacts with the column sealed face of first sealed working face and is in sealing state, second Sealing does not contact with second sealed working face, and the fluid in the described fluid source is full of described demand chamber;
When the described described spring of external force effect lower compression and the described relatively center valve rod of quantitatively being enclosed within when beginning to slide, first Sealing slides and still is in sealing state towards the transitional surface direction along the column sealed of first sealed working face; Second Sealing gradually by the non-tight of second sealed working face towards transitional surface and column sealed slip, this moment, described quantitative valve entered quantitative state, the fluid that equates with described demand chamber volume is maintained in the demand chamber;
When described quantitative cover continued to compress described spring and described relatively center valve rod continuation slip under external force, second Sealing also still was in sealing state along column sealed slip of second sealed working face; First Sealing slides also final disengaging first sealed working face and no longer forms sealing to the transitional surface and the non-tight face of first sealed working face gradually from the column sealed face of first sealed working face, this moment, described quantitative valve entered opening state, and the fluid that remains in the described demand chamber outwards discharges via the passage of described valve core inside;
After external force was cancelled, the described elastic force effect that quantitatively is enclosed within described spring took place with described center valve rod down and the opposite slide relative of glide direction when the quantitative valve opening process, and quantitative valve is closed.
3. quantitative valve according to claim 2 is characterized in that, described first Sealing and second Sealing all are arranged on the valve rod of described center, and accordingly, described first sealed working face and second sealed working face all are arranged on the inwall of described quantitative cover.
4. quantitative valve according to claim 2 is characterized in that, described first Sealing and second Sealing all are arranged on the inwall of described quantitative cover, and accordingly, described first sealed working face and second sealed working face all are arranged on the valve rod of described center.
5. quantitative valve according to claim 2 is characterized in that, described first Sealing and second sealed working face are arranged on the valve rod of described center, and accordingly, first sealed working face and described second Sealing are arranged on the inwall of described quantitative cover.
6. quantitative valve according to claim 2 is characterized in that, described first sealed working face and second Sealing are arranged on the valve rod of described center, and accordingly, first Sealing and described second sealed working face are arranged on the inwall of described quantitative cover.
7. according to any described quantitative valve in the claim 1, it is characterized in that, also comprise the valve rod spring, in the lower end of described center valve rod valve rod spring assembly department is set, described valve rod spring is installed between the lower end and described valve rod spring assembly department of described quantitative cover.
8. according to any described quantitative valve in the claim 1 to 7, it is characterized in that described quantitative cover is provided with the limited part of the sliding stroke that is used to limit the described relatively center of described quantitative cover valve rod.
9. according to any described quantitative valve in the claim 1 to 7, it is characterized in that, described non-tight face be conical surface, with the plane or the parabola of described column sealed axis normal.
10. according to any described quantitative valve in the claim 1 to 7, it is characterized in that fixedlying connected with described valve body in the lower end of described center valve rod; Perhaps, described center valve rod and described valve body are one-body molded.
11. quantitative valve according to claim 10, it is characterized in that, on the bottom surface of described valve inner, be provided with 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 the corresponding described valve rod fitting seat and be provided with can with the close-fitting flange of described groove; Perhaps, on the sidewall of described valve rod fitting seat, flange is set, simultaneously on the valve rod of described center the lugs position in the corresponding described valve rod fitting seat and be provided with can with the close-fitting groove of described flange; After described center valve rod inserts described valve rod fitting seat, by closely cooperating and make described center valve rod and described valve body form an integral body between described flange and the groove.
12. according to any described quantitative valve in the claim 1 to 7, it is characterized in that described valve body is provided with the interface that is connected with described fluid source, use so that the fluid in the described fluid source enters described valve inner.
13. according to any described quantitative valve in the claim 1 to 7, it is characterized in that, between described spool and described valve body, be provided with spool guide card, seal spool spare and retaining ring, described spool can carry out sealing with described valve body and slide under the guiding of described spool guide card and seal spool spare, described retaining ring is in order to fixedly mount described spool guide card and seal spool spare.
14. according to any described quantitative valve in the claim 1 to 7, 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 at described spool with quantitatively be provided with Sealing between the cover, in order to the sealing between the internal surface of the bottom of the outer surface on the top of guaranteeing described quantitative cover and described spool.
15. quantitative valve according to claim 14 is characterized in that, has downward step surface at described valve core inside, described Sealing is arranged between the upper-end surface of the downward step surface of described valve core inside and described quantitative cover.
16. quantitative valve according to claim 14 is characterized in that, has step surface upwards in described quantitative cover outside, described Sealing is arranged between the lower end surface of outside step surface that makes progress of described quantitative cover and 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 true CN102235527A (en) | 2011-11-09 |
| CN102235527B 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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| CN (1) | CN102235527B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104718140A (en) * | 2012-10-12 | 2015-06-17 | 娜敏芮维皮利业有限责任公司 | Metering valve for dispensing an aerosol |
| US9469467B2 (en) | 2012-10-12 | 2016-10-18 | Nemera La Verpillière S.A.S. | Metering valve for dispensing an aerosol |
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|---|---|---|---|---|
| US6302297B1 (en) * | 2000-09-06 | 2001-10-16 | Illinois Tool Works Inc. | External metering valve for a fuel cell |
| WO2005123543A1 (en) * | 2004-06-17 | 2005-12-29 | Seaquist Perfect Dispensing Gmbh | Metering valve and device for dispensing a preferably cosmetic liquid |
| 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 |
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2010
- 2010-04-30 CN CN201010163291.8A patent/CN102235527B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| WO2005123543A1 (en) * | 2004-06-17 | 2005-12-29 | Seaquist Perfect Dispensing Gmbh | Metering valve and device for dispensing a preferably cosmetic liquid |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104718140A (en) * | 2012-10-12 | 2015-06-17 | 娜敏芮维皮利业有限责任公司 | Metering valve for dispensing an aerosol |
| US9469466B2 (en) | 2012-10-12 | 2016-10-18 | Nemera La Verpillière S.A.S | Metering valve for dispensing an aerosol |
| US9469467B2 (en) | 2012-10-12 | 2016-10-18 | Nemera La Verpillière S.A.S. | Metering valve for dispensing an aerosol |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102235527B (en) | 2014-06-04 |
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