CN104386055B

CN104386055B - Carry the slow and main brake valve of drainage screen

Info

Publication number: CN104386055B
Application number: CN201410627103.0A
Authority: CN
Inventors: 田青锋
Original assignee: CHANGTONG TECHNOLOGY Co Ltd
Current assignee: CHANGTONG TECHNOLOGY Co Ltd
Priority date: 2014-11-10
Filing date: 2014-11-10
Publication date: 2016-10-05
Anticipated expiration: 2034-11-10
Also published as: CN104386055A

Abstract

This band slowly and is provided with drainage screen inside the main brake valve of drainage screen, this filter screen structure is simple, easy for installation, outside the spool of the brake valve that can load, directly drainage screen is arranged on around spool, it can be avoided that the solid housing carried in gas enters in spool, thus significantly promote the functional reliability of spool；Brake accident is avoided to occur.

Description

Carry the slow and main brake valve of drainage screen

Technical field

The invention mainly relates to the technical field of the parts of brake valve of car, a kind of with slow and the main brake valve of drainage screen.

Background technology

Filter it is generally provided with at present in the pipeline of brakes, for filtering the solid particle polluter flowed in trachea with gas, thus ensure that each brake component is not affected by solid particle polluter, ensure the reliability of its work, but owing to filter is apart from spool distant of each valve, cannot be avoided the gas after filtration before entering spool again by other newly generated solid particle pollutions, the most still there will be solid particle and enter spool, affect the sealing of spool, cause the accident of gas leakage, need to propose new solution.

The brake system of truck of the prior art and heavy goods vehicles is too anxious, and the bad control of feel easily causes brake block and heats up rapidly, causes carbonization, directly influencing braking effect, it is too urgent to brake, and also can cause sliding inclined, affect stability in the large, thus produce insecurity, or unnecessary economic loss.Problem during in order to solve these brakes of truck, two-stage cadence braking master valve that our unit successively proposes and the patent of three grades of dummy piston assemblies, it is possible to output " two grades or three grades of points stop "." point is stopped " principle can make compressed air, forms pulse in controlling pipeline and air chamber, is applied to brake block, and every subpulse is all equivalent to brake block of instrument wiping.It is not only able to accomplish that brake hubs is combined effectively with brake block, and largely further improves brake block carbonization or form adamantine layer, thus avoid the phenomenon of poor stop to occur, reach good braking effect.Critical component in above-mentioned two patent is spring bag card, and owing to spring bag card shape matching is special, processing technique is complicated, and yield rate is the highest, additionally there are the problem that mounting process is complicated, has a great impact the quality of whole main brake valve.

Summary of the invention

In order to solve the problems referred to above, the present invention proposes a kind of with slow and the main brake valve of drainage screen.

The technical scheme is that a kind of with slow and the main brake valve of drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

Described upper valve body upper end is provided with Middle face on pedal base, pedal base and is provided with opening, is provided with the cylindrical slide sleeve of upper end closed in this opening, and sliding sleeve can move up and down in opening；On the support otic placode that pedal lower end is hinged on pedal base, it is provided with rotatable pinch roller in the middle part of pedal and is pressed in the upper end of sliding sleeve,

The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step,

Being provided with secondary points in this dummy piston chamber to stop dummy piston assembly, including dummy piston body, spring bag card, tip-lever support, the top of dummy piston body is columnar width dish chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is body of rod chamber；The top of described tip-lever support is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, it is followed successively by first body of rod, second body of rod, the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber of dummy piston body bottom, in the width dish chamber that width dish is arranged in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, and between the step body of rod and the inwall of dummy piston body width dish chamber of tip-lever support, the upper end of spring bag card is provided with inside annular upper overturning, and lower end is provided with flange under outside annular；Spring bag card outer cover is equipped with one-level balancing spring, and one-level balancing spring is supported under the lower surface of tip-lever support width dish and spring bag card annular between flange upper surface；It is provided with two grades of balancing springs between spring bag card inwall and the step body of rod, the lower end of two grades of balancing springs is supported on the lower surface of dummy piston body width dish chamber, the external diameter of the upper end of two grades of balancing springs is more than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of two grades of balancing springs is less than the diameter of first body of rod；Two grades of balancing spring upper ends are L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L2 to the distance of body of rod chamber upper surface, distance between upper surface and the width dish lower surface of described spring bag card is L4, L1 ＜ L2 ＜ L4；The inside of tip-lever support is provided with push rod chamber, is provided with push rod between push rod chamber and the upper surface of sliding sleeve；

The top of described dummy piston body is provided with the edge turned up, and is provided with back-moving spring first between the step of the step dummy piston chamber in the lower surface and upper valve body at this edge；The outer surface of dummy piston body is the face of being slidably matched with the lower inner surface of the step dummy piston chamber in upper valve body, and the bottom of the outer surface of described dummy piston body is provided with cannelure, is provided with sealing ring in this cannelure；

The bottom of described upper valve body is upper valve member cavity, it is provided with interlayer between the outside and upper valve body housing of upper valve member cavity, the top of upper interlayer is through with dummy piston chamber, upper valve member cavity sidepiece is provided with the enterprising QI KOU protruding horizontally up upper valve body housing, and the sidepiece of upper valve body is additionally provided with the upper gas outlet protruding horizontally up and communicating with upper interlayer；The upper valve hole that inside flange is formed it is provided with on the top of upper valve member cavity, on this, valve hole is corresponding with the external end head position of the body of rod chamber that the bottom of described dummy piston body is stretched out, and on this, valve bore dia is more than the diameter of the external end head of body of rod chamber, is provided with valve member in upper valve member inside cavity；

Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, for the face of being slidably matched between inwall and the outer wall of upper valve of upper valve seat, and is provided with sealing structure；Upper valve seat is arranged on the lower end of upper valve member chamber by jump ring；For the face of being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, forms in-flanges and flanging at upper valve end respectively, be provided with valve spring between this flanging lower surface and upper surface of upper valve seat inside and outside this annular disk body；The upper surface of the annular disk body of upper valve upper end is provided with sealing gasket for valve, upper surface at this sealing gasket is provided with two annular protrusions, the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side forms valve venting on-off structure with the outer face of the body of rod chamber of dummy piston bottom；It is provided with upper valve core drainage screen between the outside and upper valve member cavity inner wall of upper valve spring, this spool drainage screen includes the annular end-rack on top and the annular end-rack of bottom, it is connected to the support column between the annular end-rack of upper and lower, inside support column or outside is provided with cylindrical filter net, the upper end of this filter screen is connected with the annular end-rack on top, the lower end of this filter screen is connected with the annular end-rack of bottom, the annular end-rack on described spool drainage screen top connects the upper sealing strip edge that cross section is wedge shape having ringwise, on this, the upper surface on sealing strip edge is high outside and low outside in the conical surface, for flexibly connecting between upper sealing strip edge and the annular end-rack on top；The annular end-rack of described bottom connects the lower seal edge that cross section is wedge shape having ringwise, and the lower surface at this lower seal edge is outer low and inner high in the conical surface, for flexibly connecting between the annular end-rack of lower seal edge and bottom；The upper surface on upper sealing strip edge contacts with the lower surface in upper valve hole, the lower surface at lower seal edge and the upper surface of upper valve seat；

Middle valve body include upper end be connected shell and inner core, and the interlayer that bottom is uncovered between shell and inner core, it is provided with relay piston inside the inner core of middle valve body, vertical hollow rod body that relay piston includes center and the stepped piston body being connected to around the body of rod, stepped piston body includes upper piston and lower piston, lower piston is more than upper piston, for the face of being slidably matched between upper piston and the interior tube inner surface of middle valve body, the interlayer of middle valve body forms slow chamber with the upper surface of lower piston, sidewall at middle valve body is provided with the slow interface connected with interlayer, the upper end of the hollow rod body of relay piston passes corresponding with the body of rod chamber lower end of dummy piston from the middle part of upper valve；

The top of lower valve body housing is the lower piston chamber that the lower piston with dummy piston is mated, and lower piston is the face of being slidably matched with the inwall of this lower piston chamber；

The bottom of lower valve body is lower valve assembly cavity, it is provided with lower interlayer between the outside of lower valve assembly cavity and lower valve body housing, the top of lower interlayer is through with lower piston chamber, lower valve assembly cavity sidepiece is provided with the lower air inlet protruding horizontally up lower valve body, and the sidepiece of lower valve body is additionally provided with the lower gas outlet protruding horizontally up and communicating with lower interlayer；The lower valve hole that inside flange is formed it is provided with on the top of lower valve assembly cavity, this lower valve hole is corresponding with the hollow rod body lower end position of described relay piston, and this lower valve bore dia is more than the diameter of the hollow rod body lower end of relay piston, is provided with lower valve assembly in lower valve assembly inside cavity；

Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, for the face of being slidably matched between inwall and the outer wall of lower valve of lower valve seat, and is provided with sealing structure；For the face of being slidably matched between outer wall and the inwall of lower valve assembly cavity of lower valve seat, and it is provided with sealing structure；The upper end of described lower valve is annular disk body, forms in-flanges and flanging respectively in lower valve end, be provided with lower valve spring between this flanging lower surface and upper surface of lower valve seat inside and outside this annular disk body；The upper surface of the annular disk body of lower valve upper end is provided with lower valve sealing gasket, upper surface at this sealing gasket is provided with two annular protrusions, the annular protrusion in outside cooperatively forms lower valve on-off structure with the edge in lower valve hole, and the annular protrusion of inner side forms lower valve venting on-off structure with the hollow rod body lower end of relay piston；

It is provided with bottom spool drainage screen between lower valve spring outside and lower valve assembly cavity inner wall, this spool drainage screen includes the annular end-rack on top and the annular end-rack of bottom, it is connected to the support column between the annular end-rack of upper and lower, inside support column or outside is provided with cylindrical filter net, the upper end of this filter screen is connected with the annular end-rack on top, the lower end of this filter screen is connected with the annular end-rack of bottom, the annular end-rack on described spool drainage screen top connects the upper sealing strip edge that cross section is wedge shape having ringwise, on this, the upper surface on sealing strip edge is high outside and low outside in the conical surface, for flexibly connecting between upper sealing strip edge and the annular end-rack on top；The annular end-rack of described bottom connects the lower seal edge that cross section is wedge shape having ringwise, and the lower surface at this lower seal edge is outer low and inner high in the conical surface, for flexibly connecting between the annular end-rack of lower seal edge and bottom；The upper surface on upper sealing strip edge contacts with the lower surface in lower valve hole, the lower surface at lower seal edge and the upper surface of lower valve seat；

It is provided with exhaust nozzle chamber at lower valve body, and it being installed with exhaust nozzle by jump ring, this exhaust nozzle includes urceolus and inner core, and the urceolus of exhaust nozzle is supported on the lower end of lower valve seat, inner core is sleeved on inside lower valve, for the face of being slidably matched between outer wall and the inwall of lower valve of inner core.

The external diameter of two grades of described balancing springs mates with the internal diameter of spring bag card, the internal diameter of two grades of described balancing springs and the diameter matches of second body of rod；The internal diameter of described one-level balancing spring mates with the external diameter of spring bag card.

Described width dish lower surface is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card.The lower end of described exhaust nozzle is provided with dust-proof cushion.

The described annular end-rack on spool drainage screen top, the annular end-rack of bottom, support column, upper sealing strip are the plastic material of integrated injection molding along, lower seal edge, described cylindrical filter net is stainless steel, the upper end of drainage screen and the annular end-rack hot-melt adhesive paste on top, the lower end of drainage screen and the annular end-rack hot-melt adhesive paste of bottom, the side of drainage screen and support column hot-melt adhesive paste；The cross-sectional width of the connecting portion between described upper airtight edge and the annular end-rack on top is B1, cross-sectional width B2 of the annular end-rack on top, and B1 is not more than the 1/3 of B2；Under described, the cross-sectional width of connecting portion between the annular end-rack of airtight edge and bottom is B3, and cross-sectional width B4 of the annular end-rack of bottom, B3 is not more than the 1/3 of B4.

A kind of with slow and the main brake valve of drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

The first half of upper valve body enclosure interior is provided with the dummy piston chamber of step, is provided with three grades of points and stops dummy piston assembly in dummy piston chamber,

These three grades of points are stopped dummy piston assembly, including dummy piston body, spring bag card, tip-lever support,

The top of dummy piston body is columnar width dish chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is body of rod chamber；

The top of described tip-lever support is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, it is followed successively by first body of rod, second body of rod, the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber of dummy piston body bottom, in the width dish chamber that width dish is arranged in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, and between the step body of rod and the inwall of dummy piston body width dish chamber of tip-lever support, the upper end of spring bag card is provided with inside annular upper overturning, and lower end is provided with flange under outside annular；Spring bag card outer cover is equipped with balancing spring first, and balancing spring first is supported under the lower surface of tip-lever support width dish and spring bag card annular between flange upper surface；It is provided with balancing spring second between spring bag card inwall and the step body of rod, the lower end of balancing spring second is supported on the lower surface of dummy piston body width dish chamber, the external diameter of the upper end of balancing spring second is less than annular upper overturning diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of balancing spring second is less than the diameter of first body of rod；Balancing spring third it is provided with in body of rod chamber,

Balancing spring second upper end is L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L3 to the distance of body of rod chamber upper surface, the upper end of balancing spring third is L2 to the distance between the 3rd body of rod lower surface, distance between upper surface and the width dish lower surface of described spring bag card is L4, L1 ＜ L2 ＜ L3 ＜ L4；

The external diameter of described balancing spring second mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and the diameter matches of second body of rod；The internal diameter of described balancing spring first mates with the external diameter of spring bag card；Described balancing spring third is rubber spring.

The solution have the advantages that:

This band is slow simultaneously and the main brake valve of drainage screen, the spring bag card of its internal secondary points stops dummy piston and three grades of points are stopped dummy piston assembly, use upper, annular in-flanges, the structure of lower annular flanging, simplify the structure of spring bag card, reduce difficulty of processing and assembly difficulty, it is possible to the significantly qualification rate of improving product.

Spring bag card can pass through machining straight forming, it is also possible to carries out one-time formed processing by Sheet Metal Forming Technology, and the course of processing is simple, many that spring installation spring bag card within simultaneously is the simplest.

Accompanying drawing explanation

This band of Fig. 1 is slow and the cross-sectional view of the main brake valve of drainage screen；

This band of Fig. 2 is slow and the cross-sectional view of the main brake valve of drainage screen；

Fig. 3 is that in Fig. 1 and Fig. 2, the master of spool drainage screen regards cross-sectional view；

Fig. 4 is the C-C cross-sectional view in Fig. 3；

Fig. 5 is the partial enlargement structural representation in Fig. 3；

Fig. 6 is that this secondary points is stopped the main TV structure schematic diagram of dummy piston assembly；

Fig. 7 is that these three grades of points are stopped the main TV structure schematic diagram of dummy piston assembly；

Fig. 8 is the main TV structure schematic diagram of spring bag card；

Fig. 9 is the A-A cross-sectional view of Fig. 8；

Figure 10 is the main TV structure schematic diagram of tip-lever support；

Figure 11 is the B-B cross-sectional view of Figure 10；

null1. dust-proof cushion in figure、2. air vent、3. jump ring、4.O type circle、5.O type circle、6.O type circle、7.O type circle、8. lower valve spring、9. bolt、10. descend valve body、Valve body in 11.、12. upper valve bodies、Valve spring on 13.、14. dummy pistons、15. tip-lever supports、16.O type circle、17. one-level balancing springs or balancing spring first、18. back-moving springs、19. spring bag cards、20. 2 grades of balancing springs or balancing spring second、21. bolts、22. jump rings、23. pedal bases、24. dirt-proof boots、25. sliding sleeves、26. push rod 27. lower valve seats、28. lower valves、29.O type circle、30.O type circle、31. relay pistons、32.O type circle、33.O type circle、34. circlips、35.O type circle、Valve seat on 36.、37.O type circle、38.O type circle、Valve on 39.、40. adjust screw、41. locking nuts、42. pedals、43. Anti-slip covers、44. bearing pins、45. plain washers、46. split pins、47. rollers、48. bearing pins、49. plain washers、50. split pins、51. balancing springs third、52. enterprising QI KOU、53、Upper gas outlet、54. times air inlets、55. times gas outlets、56. slow interfaces、57. upper valve core drainage screens、58. bottom spool drainage screens；

Wherein flange under 15-1. width dish, 15-2. annular groove, 15-3. first body of rod, 15-4. second body of rod, 15-5. the 3rd body of rod, 19-1. annular upper overturning, 19-2..

Sealing strip edge, the annular end-rack on 102. tops, 103. support columns, 104. drainage screens, the annular end-rack of 105. bottoms, 106. lower seal edges on 101. in figure；The upper upper surface sealing edge of 101-1..

Detailed description of the invention

Embodiment: see Fig. 1,3, Fig. 5-8, a kind of with the slow and main brake valve of drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

Being provided with secondary points in this dummy piston chamber to stop dummy piston assembly, including dummy piston body, spring bag card, tip-lever support, the top of dummy piston body is columnar width dish chamber, and the cavity shape projection that the bottom of dummy piston body is stretched out is body of rod chamber；The top of described tip-lever support is width dish, bottom is attenuate successively the three sections of step bodies of rod stretched out from width dish, it is followed successively by first body of rod, second body of rod, the 3rd body of rod from top to down, the hypomere of the 3rd body of rod inserts in the body of rod chamber of dummy piston body bottom, in the width dish chamber that width dish is arranged in dummy piston body by jump ring；Described spring Bao Kawei is columnar structured, and between the step body of rod and the inwall of dummy piston body width dish chamber of tip-lever support, the upper end of spring bag card is provided with inside annular upper overturning, and lower end is provided with flange under outside annular；Spring bag card outer cover is equipped with one-level balancing spring, and one-level balancing spring is supported under the lower surface of tip-lever support width dish and spring bag card annular between flange upper surface；It is provided with two grades of balancing springs between spring bag card inwall and the step body of rod, the lower end of two grades of balancing springs is supported on the lower surface of dummy piston body width dish chamber, the external diameter of the upper end of two grades of balancing springs is more than annular upper overturning internal diameter, annular upper overturning internal diameter is more than or equal to the diameter of first body of rod, and the internal diameter of the upper end of two grades of balancing springs is less than the diameter of first body of rod；Two grades of balancing spring upper ends are L1 to the distance of the step surface of the first body of rod lower end, the step surface of the second body of rod lower end is L2 to the distance of body of rod chamber upper surface, distance between upper surface and the width dish lower surface of described spring bag card is L3, L1 ＜ L2 ＜ L3；The inside of tip-lever support is provided with push rod chamber, is provided with push rod between push rod chamber and the upper surface of sliding sleeve；

Upper valve member includes upper valve and the upper valve seat of annular of tubular, and upper valve seat is sleeved on outside valve, for the face of being slidably matched between inwall and the outer wall of upper valve of upper valve seat, and is provided with sealing structure；Upper valve seat is arranged on the lower end of upper valve member chamber by jump ring；For the face of being slidably matched between outer wall and the inwall of upper valve member cavity of upper valve seat, and it is provided with sealing structure；The upper end of described upper valve is annular disk body, forms in-flanges and flanging at upper valve end respectively, be provided with valve spring between this flanging lower surface and upper surface of upper valve seat inside and outside this annular disk body；The upper surface of the annular disk body of upper valve upper end is provided with sealing gasket for valve, upper surface at this sealing gasket is provided with two annular protrusions, the annular protrusion in outside cooperatively forms valve opening and closing structure with the edge in valve hole, and the annular protrusion of inner side forms valve venting on-off structure with the outer face of the body of rod chamber of dummy piston bottom；

It is provided with upper valve core drainage screen between the outside and upper valve member cavity inner wall of upper valve spring, this spool drainage screen includes the annular end-rack on top and the annular end-rack of bottom, it is connected to the support column between the annular end-rack of upper and lower, inside support column or outside is provided with cylindrical filter net, the upper end of this filter screen is connected with the annular end-rack on top, the lower end of this filter screen is connected with the annular end-rack of bottom, the annular end-rack on described spool drainage screen top connects the upper sealing strip edge that cross section is wedge shape having ringwise, on this, the upper surface on sealing strip edge is high outside and low outside in the conical surface, for flexibly connecting between upper sealing strip edge and the annular end-rack on top；The annular end-rack of described bottom connects the lower seal edge that cross section is wedge shape having ringwise, and the lower surface at this lower seal edge is outer low and inner high in the conical surface, for flexibly connecting between the annular end-rack of lower seal edge and bottom；The upper surface on upper sealing strip edge contacts with the lower surface in upper valve hole, the lower surface at lower seal edge and the upper surface of upper valve seat；

Described width dish lower surface is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

The described annular end-rack on spool drainage screen top, the annular end-rack of bottom, support column, upper sealing strip are the plastic material of integrated injection molding along, lower seal edge, described cylindrical filter net is stainless steel, the upper end of drainage screen and the annular end-rack hot-melt adhesive paste on top, the lower end of drainage screen and the annular end-rack hot-melt adhesive paste of bottom, the side of drainage screen and support column hot-melt adhesive paste；The cross-sectional width of the connecting portion between described upper airtight edge and the annular end-rack on top is B1, cross-sectional width B2 of the annular end-rack on top, and B1 is not more than the 1/3 of B2；Under described, the cross-sectional width of connecting portion between the annular end-rack of airtight edge and bottom is B3, cross-sectional width B4 of the annular end-rack of bottom, B3 is not more than the 1/3 of B4, connecting portion is narrow, and beneficially it deforms under pressure, makes the end face on sealing strip edge preferably fit with other parts, and sealing effectiveness is more preferable, connecting portion is the narrowest more good, accompanying drawing 3 simply depicts the relation of B1 and B2, due to B3 and B4 positional symmetry, it is not necessary that the most again indicate.

Work process:

After driver steps on pedal, act on push rod, tip-lever support is the most descending under push rod effect, first to one-level balancing spring effect, it is made to compress with the descending of tip-lever support, after its stroke L1 completes, the first body of rod lower surface of tip-lever support and two grades of balancing spring upper-end contact, then one-level balancing spring and two grades of balancing spring cooperation；

For further description structure herein, need to select suitable one-level balancing spring and two grades of balancing springs, the rigidity of described one-level balancing spring is installed rear stage balancing spring more than the rigidity of two grades of balancing springs, this dummy piston assembly the lower flange of spring bag card is pressed onto the lower surface of width dish chamber；So first act on one-level balancing spring when tip-lever support is descending, after the stroke of L1 completes, simultaneously act on firsts and seconds balancing spring, two spring its effects side by side again, thus form twice buffering.

Another situation be exactly the spring selecting length just to mate with spring bag card internal height as two grades of balancing springs, thus need not limit the rigidity of two grades of balancing springs, also can realize secondary buffer.

After the upper valve in valve body and lower valve are opened, other flowed through first have to filter through drainage screen, and drainage screen is cylindrical shape, are all filtering surfaces at one week, even if just can also breathe freely areas of blockage also other positions of mouth of entering, it is not easy to block.

Embodiment two: see Fig. 2,4, Fig. 5-8, in figure, 5. 1 kinds of bands are slow and the main brake valve of drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

Lower valve assembly includes lower valve and the lower valve seat of annular of tubular, and lower valve cover for seat is contained in outside lower valve, for the face of being slidably matched between inwall and the outer wall of lower valve of lower valve seat, and is provided with sealing structure；For the face of being slidably matched between outer wall and the inwall of lower valve assembly cavity of lower valve seat, and it is provided with sealing structure；The upper end of described lower valve is annular disk body, forms in-flanges and flanging respectively in lower valve end, be provided with lower valve spring between this flanging lower surface and upper surface of lower valve seat inside and outside this annular disk body；The upper surface of the annular disk body of lower valve upper end is provided with lower valve sealing gasket, and the upper surface at this sealing gasket is provided with two annular protrusions, and the annular protrusion in outside cooperatively forms lower valve on-off structure with the edge in lower valve hole,

The annular protrusion of inner side and the hollow rod body lower end of relay piston form lower valve venting on-off structure；It is provided with exhaust nozzle chamber at lower valve body, and it being installed with exhaust nozzle by jump ring, this exhaust nozzle includes urceolus and inner core, and the urceolus of exhaust nozzle is supported on the lower end of lower valve seat, inner core is sleeved on inside lower valve, for the face of being slidably matched between outer wall and the inwall of lower valve of inner core.

The external diameter of described balancing spring second mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and the diameter matches of second body of rod；The internal diameter of described balancing spring first mates with the external diameter of spring bag card；Described balancing spring third is rubber spring.Described width dish lower surface is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card.

The lower end of described exhaust nozzle is provided with dust-proof cushion.

Work process:

After driver steps on pedal, act on push rod, tip-lever support is the most descending under push rod effect, first to balancing spring first effect so that it is compress with the descending of tip-lever support, after its stroke L1 completes, 3rd body of rod lower end of tip-lever support contacts with balancing spring third, and now balancing spring third and balancing spring first act on jointly, after its L2 stroke completes, first body of rod lower surface of tip-lever support and balancing spring second upper-end contact, now balancing spring first, balancing spring third and balancing spring second cooperation；

For further description structure herein, need to select suitable balancing spring first and balancing spring second, the rigidity of described balancing spring first is installed back balance spring first more than the rigidity of balancing spring second, this dummy piston assembly the lower flange of spring bag card is pressed onto the lower surface of width dish chamber；So first act on balancing spring first when tip-lever support is descending, simultaneously act on again after the stroke of L2 completes balancing spring first, second, third, its effects side by side of three springs.

Another situation be exactly the spring selecting length just to mate with spring bag card internal height as balancing spring second, thus need not limit the rigidity of balancing spring second.

Claims

1. carry a slow and main brake valve for drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

The top of lower valve body housing is the lower piston chamber that the lower piston with relay piston is mated, and lower piston is the face of being slidably matched with the inwall of this lower piston chamber；

Band the most according to claim 1 is slow and the main brake valve of drainage screen, it is characterized in that: the external diameter of two grades of described balancing springs mates with the internal diameter of spring bag card, the internal diameter of two grades of described balancing springs and the diameter matches of second body of rod；The internal diameter of described one-level balancing spring mates with the external diameter of spring bag card.

Band the most according to claim 1 is slow and the main brake valve of drainage screen, it is characterized in that: described width dish lower surface is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card；The lower end of described exhaust nozzle is provided with dust-proof cushion.

Band the most according to claim 1 is slow and the main brake valve of drainage screen, it is characterized in that: described upper valve core drainage screen and the annular end-rack on bottom spool drainage screen top, the annular end-rack of bottom, support column, upper sealing strip edge, lower seal edge are the plastic material of integrated injection molding, described cylindrical filter net is stainless steel, the upper end of drainage screen and the annular end-rack hot-melt adhesive paste on top, the lower end of drainage screen and the annular end-rack hot-melt adhesive paste of bottom, the side of drainage screen and support column hot-melt adhesive paste；The cross-sectional width of the described connecting portion between upper sealing strip edge and the annular end-rack on top is B1, and cross-sectional width B2 of the annular end-rack on top, B1 is not more than the 1/3 of B2；The cross-sectional width of the connecting portion between described lower seal edge and the annular end-rack of bottom is B3, cross-sectional width B4 of the annular end-rack of bottom, and B3 is not more than the 1/3 of B4.

5. carry a slow and main brake valve for drainage screen, including the upper valve body being bolted together, middle valve body, lower valve body,

Band the most according to claim 5 is slow and the main brake valve of drainage screen, it is characterized in that: the external diameter of described balancing spring second mates with the internal diameter of spring bag card, the internal diameter of described balancing spring second and the diameter matches of second body of rod；The internal diameter of described balancing spring first mates with the external diameter of spring bag card；Described balancing spring third is rubber spring.

Band the most according to claim 5 is slow and the main brake valve of drainage screen, it is characterized in that: described width dish lower surface is provided with annular groove outside first body of rod；This annular groove width mates with the width of the upper end of spring bag card；The lower end of described exhaust nozzle is provided with dust-proof cushion.

Band the most according to claim 5 is slow and the main brake valve of drainage screen, it is characterized in that: the described annular end-rack on spool drainage screen top, the annular end-rack of bottom, support column, upper sealing strip are the plastic material of integrated injection molding along, lower seal edge, described cylindrical filter net is stainless steel, the upper end of drainage screen and the annular end-rack hot-melt adhesive paste on top, the lower end of drainage screen and the annular end-rack hot-melt adhesive paste of bottom, the side of drainage screen and support column hot-melt adhesive paste；The cross-sectional width of the described connecting portion between upper sealing strip edge and the annular end-rack on top is B1, and cross-sectional width B2 of the annular end-rack on top, B1 is not more than the 1/3 of B2；The cross-sectional width of the connecting portion between described lower seal edge and the annular end-rack of bottom is B3, cross-sectional width B4 of the annular end-rack of bottom, and B3 is not more than the 1/3 of B4.