CN201844082U

CN201844082U - Automatic drainage valve

Info

Publication number: CN201844082U
Application number: CN2010205096436U
Authority: CN
Inventors: 李玉喜
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-27
Filing date: 2010-08-27
Publication date: 2011-05-25
Anticipated expiration: 2020-08-27

Abstract

The utility model discloses an automatic drainage valve and relates to a drainage valve. The automatic drainage valve has simpler structure, better sealing effect, ensures a valve core to move more flexibly, realizes smooth drainage and operates reliably. The automatic drainage valve is provided with a valve body, a joint, a filter screen, a bottom cover and a valve core, wherein the valve body adopts a hollow valve body with one opened upper end and one opened lower end; a valve core guide hole is formed at an upper port of the valve body; the joint is arranged at the upper end of the valve body and fixedly connected with the valve body; the bottom cover is arranged at the lower end of the valve body, sealed with the valve body and provided with a central drainage hole; the filter screen is arranged at an inlet of the joint; the valve core is arranged in an inner cavity of the valve body and provided with an upper guide rod and a lower guide rod; the upper guide rod is in sliding fit with the valve core guide hole of the valve body; the lower guide rod is in sliding fit with the central drainage hole of the bottom cover; a sealing element is arranged at the middle part of the valve core; the upper end of the sealing element at the middle part of the valve core is in touch pressure seal with a lip type sealing ring on the wall of the inner cavity of the valve body, and the lower end of the sealing element at the middle part of the valve core is in touch pressure seal with a lip type sealing ring at the upper end of the central hole of the bottom cover.

Description

A kind of automatic drain valve

Technical field

The utility model relates to a kind of drain valve, especially relates to a kind of a kind of automatic drain valve that is mainly used in engineering vehicle braking system such as automobile, loader.

Background technique

The braking system of engineering vehicle such as automobile, loader is to provide pressurized air to brake by air compressor, often there is certain condensation profit in the gas circuit, the condensation profit can produce serious harm even cause security incident motor vehicle braking system, must in time get rid of by automatic drain valve.

The conventional structure of existing automatic drain valve is as shown in Figure 2:

Among Fig. 2, each label is represented: 21. filter screens, 22. jointings, 23. spools, 24. supporting frames, 25. springs, 26. storage chambers, 27. bottoms, 28. valve bodies.Its working principle is: when the system gas voltage rise is high, profit arrives the upper-end surface of spool 23 by filter screen 21 and jointing 22, overcome the elastic force of the spring 25 that is installed on the supporting frame 24 then, arrive storage chamber 26, this moment, the following end seal and the bottom 27 of spool 23 were in sealing state, not draining of automatic drain valve.During the system gas drops, the air pressure in the storage chamber 26 is greater than system's air pressure, and spool 23 moves up under air pressure promotes, and this moment, the following end seal and the bottom 27 of spool 23 were in open mode, the automatic drain valve draining.

The major defect that existing automatic drain valve exists is as follows:

1) the equipment chamber of calming the anger not in the valve body; May hold full water, cause draining to lose efficacy, be prone to the bursting by freezing phenomenon winter.

2) valve core structure is unreasonable; Spool and valve seal part are thicker, and thinner near the spool part, the center spool part is thicker.So thin part is yielding, is deformed to when a certain amount of, and the sealing of spool bottom just may not opened, and causes inefficacy.

3) guide rod unreasonable structure; The top and bottom of guide rod are cylindrical structural, can produce bigger frictional force with its perisporium, when impurity enters, than being easier to clamping stagnation.

4) spool upper-end surface and valve seal tongue are realized sealing, sealing is realized with bottom sealing tongue in the spool bottom, realize good sealing, the requirement on machining accuracy of two sealing tongues is very high, but there is unstability in processing, so also there is unstability in sealing, directly influences the draining sealing effect, in case and sealing tongue corrosion will cause inefficacy.

5) being connected between filter screen and the jointing is that clamp-close type connects, and connects reliably inadequately, and the filter screen operating time is long afterwards yielding even come off, and the filter table area of filter screen is less, can influence filtering effect.

Summary of the invention

The purpose of this utility model is to provide that a kind of structure is simple, sealing effect better, valve core movement flexibly, the automatic drain valve of unobstructed, the reliable operation of draining.

The utility model is provided with valve body, joint, filter screen, bottom and spool;

Valve body is the hollow valve body of the equal opening in top and bottom, the upper end-hole of valve body is the spool pilot hole, joint is located at the valve body upper end and is connected with valve body, bottom be located at valve body lower end and and valve seal, bottom is provided with the central row water hole, filter screen is located at joint inlet, spool is located at body cavity, spool is provided with top guide bar and lower guide rod, the spool pilot hole of top guide bar and valve body is slidingly matched, and lower guide rod and bottom central row water hole are slidingly matched, and the spool middle part is provided with Sealing, the Sealing upper end and the lip seal circle of being located on the body cavity wall at spool middle part press sealing, and the Sealing lower end at spool middle part presses sealing with the lip seal circle of being located at bottom center hole upper end.

The two ends of described joint are equipped with screw thread, and the lower end and the valve body of joint are spirally connected, and the upper end of joint is external in brake line.

The below of described bottom is provided with the jump ring of fixed bottom cover, and jump ring is embedded in the valve body lower end mouth.

Described filter screen is located at joint inlet, preferably between filter screen lower end and the joint import for being spirally connected, annexation is reliable and stable like this, filter screen is cylindric filter screen, cylindric strainer filtering surface area is bigger, can avoid stopping up, and guarantees filtering effect.

The top guide bar and the lower guide rod of described spool are radial structure, can both keep drain function, guarantee that again the motion of spool is smooth and easy flexibly.

The top of the Sealing at described spool middle part increases thickness with radius and reduces, sealing part edge part is thin to be in order easily to realize sealing, be unlikely to overtension again, thereby guarantee the time can easily open and be located at the sealing of the lip seal circle on the body cavity wall in water inlet, can be better when draining and be located at the sealing of the lip seal circle on the body cavity wall.

The top guide bar shaft axis of described spool, the shaft axis of lower guide rod and bottom shaft axis are same shaft axis, can guarantee coaxality like this, make the spool operation more freely, and precision is higher.

Compare with existing automatic drain valve, the utlity model has following outstanding advantage and effect:

1, because the Sealing upper end at spool middle part presses sealing with the lip seal circle of being located on the body cavity wall, rather than relies on the acting force of the spring sealing, can avoid like this producing gas leakage because of spring gets rusty to lose efficacy.And the Sealing at spool middle part is and the body cavity wall on the lip seal circle between press sealing, like this be sealed into flexible sealing, Sealing and lip seal circle only produce finite deformation, can guarantee Sealing and seal ring long service life like this, reliable operation.

2, because the Sealing lower end at spool middle part presses sealing with the lip seal circle of being located in the bottom center hole.Rather than seal with bottom central row water hole between the spool lower end.Can eliminate the seal failure gas leakage that causes because of machining error like this.Can guarantee to seal validity.Like this be sealed into flexible sealing, Sealing and lip seal circle only produce finite deformation, can guarantee Sealing and seal ring long service life, reliable operation.

3, because spool is provided with top guide bar and lower guide rod, top guide bar shaft axis, lower guide rod shaft axis and bottom shaft axis are same shaft axis.Can guarantee coaxality like this, avoid the spool clamping stagnation, make the spool operation more freely, precision is higher.

4, owing to the cylindric filter screen of filter screen, its filter table area is bigger, can avoid stopping up.For being spirally connected, annexation is stable like this between filter screen lower end and the joint import, can avoid filter screen to come off or be out of shape the assurance reliable operation.

5, be provided with the chamber of calming the anger fully in the valve body, draining voluntarily after body cavity has held certain water yield avoids body cavity to hold full water, so just can not cause draining to lose efficacy, and can avoid occurring winter valve body bursting by freezing phenomenon.

Description of drawings

Fig. 1 is the utility model embodiment's a structural representation.

Fig. 2 is existing automatic drain valve conventional structure schematic representation.

Embodiment

Referring to Fig. 1, the utility model embodiment is provided with valve body 10, joint 8, filter screen 1, bottom 13 and spool 11.

Valve body 10 is the hollow valve body of the equal opening in lower end, upper end, and the upper end-hole 9 of valve body 10 is a spool pilot hole 9, and the two ends of joint 8 are equipped with screw thread, and the lower end of joint 8 and valve body 10 are spirally connected, and the upper end of joint 8 is external in brake line.Bottom 13 is located at valve body 10 lower ends and is sealed with valve body 10, and the below of bottom 13 is provided with the jump ring 14 of fixed bottom cover 13, and jump ring 14 is embedded in valve body 10 lower end mouth.Bottom 13 is provided with central row water hole 15.Filter screen 1 is cylindric filter screen, and filter screen 1 is located at joint 8 inlets, and filter screen 1 lower end and joint 8 inlets are spirally connected.Filter screen 1 filter table area is bigger, can avoid stopping up.Spool 11 is located at valve body 10 inner chambers, spool 11 is provided with top guide bar 2 and lower guide rod 7, top guide bar 2 and lower guide rod 7 are radial structure, can both keep drain function, the motion that guarantees spool 11 again is smooth and easy flexibly, top guide bar 2 is slidingly matched with the spool pilot hole 9 of valve body 10, and lower guide rod 7 is slidingly matched with bottom central row water hole 15.Spool 11 middle parts are provided with Sealing 5, the top of Sealing 5 increases thickness with radius and reduces, Sealing 5 upper ends press sealing with the lip seal circle of being located on valve body 10 internal chamber walls 4, and Sealing 5 lower ends press sealing with the lip seal circle 6 of being located at 15 upper ends, bottom central row water hole.Top guide bar 2 shaft axiss of spool 11, the shaft axis of lower guide rod 7 and bottom 13 shaft axiss are same shaft axis.Can guarantee coaxality like this, make spool 11 operations more freely, precision is higher.

Form an actor's rendering of an operatic tune 3 of automatic drain valve between Sealing 5 upper surfaces and valve body 10 inner skew walls and the top guide bar 2, formed the chamber 12 of calming the anger fully of automatic drain valve between Sealing 5 lower surfaces and valve body 10 inwalls and the bottom 13.When braking, braking system air pressure descends, the air pressure in chamber 12 of then calming the anger fully upwards promotes spool 11, so, move on the lower guide rod 7, depressurization between lower guide rod 7 and the bottom central row water hole 15, because valve body 10 also is to be communicated with brake line, so just can be with profit 15 discharges of brake line from bottom central row water hole.After braking finished, braking system air pressure recovered, and spool 11 decline returns with 15 sealings of bottom central row water hole, are waited for draining when next time braking again.So circulation promptly realizes automatic draining.

Claims

1. an automatic drain valve comprises valve body, joint, filter screen, bottom and spool; It is characterized in that valve body is the hollow valve body of the equal opening in top and bottom, the upper end-hole of valve body is the spool pilot hole, joint is located at the valve body upper end and is connected with valve body, bottom be located at valve body lower end and and valve seal, bottom is provided with the central row water hole, filter screen is located at joint inlet, spool is located at body cavity, spool is provided with top guide bar and lower guide rod, the spool pilot hole of top guide bar and valve body is slidingly matched, lower guide rod and bottom central row water hole are slidingly matched, the spool middle part is provided with Sealing, the Sealing upper end and the lip seal circle of being located on the body cavity wall at spool middle part press sealing, and the Sealing lower end at spool middle part presses sealing with the lip seal circle of being located at bottom center hole upper end.

2. a kind of automatic drain valve as claimed in claim 1 is characterized in that the two ends of described joint are equipped with screw thread, and the lower end and the valve body of joint are spirally connected, and the upper end of joint is external in brake line.

3. a kind of automatic drain valve as claimed in claim 1 is characterized in that the below of described bottom is provided with the jump ring of fixed bottom cover, and jump ring is embedded in the valve body lower end mouth.

4. a kind of automatic drain valve as claimed in claim 1 is characterized in that described filter screen is located at joint inlet, be between filter screen lower end and the joint import for being spirally connected, described filter screen is cylindric filter screen.

5. a kind of automatic drain valve as claimed in claim 1 is characterized in that the top guide bar of described spool and lower guide rod are radial structure.

6. a kind of automatic drain valve as claimed in claim 1 is characterized in that the top of the Sealing at described spool middle part reduces with radius increase thickness.

7. a kind of automatic drain valve as claimed in claim 1 is characterized in that the top guide bar shaft axis of described spool, the shaft axis and the bottom shaft axis of lower guide rod are same shaft axis.