CN201963407U - Exhaust brake butterfly valve - Google Patents
Exhaust brake butterfly valve Download PDFInfo
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- CN201963407U CN201963407U CN2011200264919U CN201120026491U CN201963407U CN 201963407 U CN201963407 U CN 201963407U CN 2011200264919 U CN2011200264919 U CN 2011200264919U CN 201120026491 U CN201120026491 U CN 201120026491U CN 201963407 U CN201963407 U CN 201963407U
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- pressure limiting
- exhaust brake
- butterfly valve
- valve
- tappet
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Abstract
Provided is an exhaust brake butterfly valve. A pressure limiting seal piston (20) is slidably arranged in a pressure limiting device which is arranged on a valve body (1). The pressure limiting seal piston (20) is in a step shape and formed by a tappet (21) and a support (22). The outer surface of the tappet (21) is provided with a first ring groove (211). The tappet (21) protrudes and extends into an inner cavity of the valve body (1) through an open hole (100) arranged on the inner wall of the valve body (1), and is correspondingly inserted into a relief notch (31) of a butterfly piece. The support (22) is arranged inside a shell of the pressure limiting device. Static pressure holes (9) are arranged at the outside and an air inlet cavity wall of the open hole (100). The bottom of the support (22) is provided with a pressure limiting spring (7) which abuts against a spring end cover (40). The exhaust brake butterfly valve has compact structure, effectively controls the motion trip of the pressure limiting seal piston, prevents the butterfly piece from self-locking by closing, improves the exhaust back pressure value of an engine during low-speed operation, ensures the air resistance to be zero when the pressure limiting seal piston reciprocates, and prevents the pressure limiting spring from becoming invalid caused by high temperature.
Description
Technical field
The utility model relates to a kind of exhaust brake dish valve, belongs to machinery manufacturing technology field.
Background technique
Exhaust brake is a kind of complemental brake system of vehicle, be specially adapted to (heavy type) truck and (large-scale) passenger vehicle and engineering vehicle, need not use or use less foundation brakes (traditional friction brake), just vehicle can be controlled in certain safety speed scope, the prevention car brakeing is malfunctioning, guarantees traffic safety.Existing exhaust brake mainly is made up of cylinder or vacuum servo cylinder and connected exhaust braking valve.
Tappet in the existing exhaust braking valve adopts isometrical cylindrical structure up and down usually, and cylindrical outer wall is smooth, the inner inner chamber that forms hollow, and in inner chamber, be provided with spring, this gauge structure that waits is not easy its position and movement travel are controlled.In addition, between the bi-side of the end face of the end of tappet and pressure release breach and the circumferential surface of tappet and pressure release breach, be linear sealing, sealing effect is poor.When time of engine low speed, exhaust back pressure is low, influences braking effect.Simultaneously, under the air-flow effect, tappet is easy to abut on the side sidewall of tappet bore because of producing wall attachment effect, causes the leakage rate of gas big, influences braking effect.In addition,, be arranged on the spring in the tappet inner chamber, work under the hot environment of the engine exhaust in body cavity, very easily lost efficacy because of temperature distortion takes place because the top of tappet protrudes out at valve inner.Have again, the braking effect of existing exhaust braking valve in order to guarantee to reach good, the rigidity that requirement is arranged on the spring in the tappet inner chamber is bigger, its rigidity size is approximate with the valve spring rigidity of motor, and in the course of the work, both are easy to generate resonance, noise increases, even brings potential safety hazard.And the cylinder of motor is generally a plurality of, and difference cylinder is by suction, pressure, quick-fried, alignment preface acting, and the engine exhaust pulsation in the valve body air-inlet cavity enters the air pressure instability.
Existing exhaust braking valve, because the butterfly sheet is when closing, its position tilts, the butterfly sheet also tilts to the active force of tappet end.This active force is broken down into two component of level and Vertical direction, under the situation of horizontal component 〉=vertical stress component, self-locking takes place very easily after valve block is closed.When stopping braking when needing pressure release, self-locking causes obstruction to opening once more of butterfly sheet, and the butterfly sheet can't be realized its effective exercise.Simultaneously, in the long-term working procedure of exhaust braking valve, also a part of carbon distribution can be produced on the valve interior wall,, also braking effect can be influenced if can not be cleared up timely.
The obstruction on the existing regulator and the housing of regulator are full-closed structure.When the butterfly sheet is closed, when engine exhaust entered the air-inlet cavity of valve body, a part of gas inevitably entered in the housing of regulator, and the to-and-fro motion of tappet is caused obstruction, can't effectively regulate and control exhaust back pressure.Simultaneously, because the temperature of engine exhaust is very high, the structure of sealing causes regulator housing inner chamber to dispel the heat, and continuous high temperature can make the temperature distortion of pressure limiting spring, even loses efficacy, and the braking action of exhaust brake seriously lags behind, and sensitivity reduces greatly.
In addition, the obstruction on the existing exhaust braking valve directly is threaded with the regulator housing, and rigging position can manual tune, to its random tightening or unscrewing, all might cause the global failure of exhaust brake.
The model utility content
Technical problem to be solved in the utility model is, provide a kind of exhaust brake butterfly valve at the deficiencies in the prior art, simple and compact for structure, reduce the resistance to motion of pressure limiting packed-piston, reduce exhaust gas leakage, effectively control the position and the movement travel of pressure limiting packed-piston; Prevent that effectively the butterfly sheet from closing self-locking, guarantee the effective exercise of butterfly sheet, the fitted seal of butterfly sheet and pressure limiting packed-piston is good, the exhaust back pressure value during the raising low engine speed; The vent that many places are offered, guaranteed the unobstructed of pressure limiting device housing inner chamber in the exhaust brake butterfly valve and atmosphere, resistance of air when guaranteeing the to-and-fro motion of pressure limiting packed-piston is zero, effectively regulates and control engine exhaust back pressure and heat radiation in time, prevents pressure limiting spring Yin Gaowen and loses efficacy.
Technical problem to be solved in the utility model is achieved by the following technical solution:
A kind of exhaust brake butterfly valve comprises valve body, is provided with the butterfly sheet in the valve body, and the edge of butterfly sheet offers the pressure release breach; Described butterfly sheet is fixed in the body cavity by rotating shaft, and described butterfly sheet links to each other with operating device, and it is to overturn in body cavity in the center with the rotating shaft that operating device drives the butterfly sheet, when the butterfly sheet is closed body cavity is divided into air-inlet cavity and exhaust cavity; Described valve body is provided with pressure limiting device, comprise the pressure limiting device housing that is arranged on the body wall, the bottom of pressure limiting device housing is provided with the spring end cap, be slidingly fitted with the pressure limiting packed-piston in the described pressure limiting device housing, described pressure limiting packed-piston comprises piston only, this piston only is stepped, is made up of the tappet on top and the bearing of bottom, and the diameter of tappet is less than the diameter of bearing; Offer first annular groove on the outer surface of described tappet;
Described tappet protrudes out body cavity by being opened in the perforate on the valve interior wall, and corresponding inserted is in described pressure release breach; Described bearing is arranged in the pressure limiting device housing;
Also offer baroport on the described perforate outside, the air-inlet cavity wall; Described first annular groove is positioned at the perforate inboard on the valve interior wall; Described rest base is equipped with the pressure limiting spring, this pressure limiting spring and the spring end cap top that offsets.
In order to guarantee the space of pressure limiting packed-piston, be provided with the gap between described bearing upper-end surface and the pressure limiting device inner walls.
As required, the quantity of offering of described first annular groove is more than one, and the interval between adjacent two first annular grooves is not less than 2mm.
In order to reach better effect, offer second annular groove on the outer surface of described bearing; The quantity of offering of described second annular groove is more than one, and the interval between adjacent two second annular grooves is not less than 2mm.
The cell body sectional shape of described first annular groove and/or second annular groove is semicircle, trapezoidal, U-shaped or rectangle.
The groove depth size and the groove width size of described first annular groove and second annular groove are respectively: 0.1mm≤groove depth≤0.5mm, 0.3mm≤groove width≤2.5mm.
The upper and lower circumferential surface of described tappet offers plat part respectively, plat part is offered towards the bearing direction from the top of tappet, width 〉=the 2.5mm of plat part, the CLV ceiling limit value of width is less than the radius of tappet, the length of plat part is less than the distance of described tappet end to described first annular groove, the distance 〉=2.5mm of end-to-end distance first annular groove of plat part.
Offer guiding groove on the cylindrical of described bearing, described guiding groove is identical with the center symmetry plane of described plat part; The width of described guiding groove is 3-6mm, and the degree of depth is 1.8-4mm, and length is 5-20mm.
Described bearing inside offers spring mounting hole, and this spring mounting hole is blind hole or shoulder hole, and its degree of depth is less than bearing length; Wall thickness dimension between the inwall of described spring mounting hole and the guiding groove bottom land, 2mm≤wall thickness≤8mm;
The diameter of described blind hole is 5-21mm; The diameter in the big footpath of described shoulder hole is 5-21mm, and the diameter of the path of shoulder hole is 5-16mm.
The quantity of described baroport is 2-5, and the center line angle of outermost two baroports is not more than 120 °, and when the butterfly sheet was closed, described baroport was positioned at the valve body suction port end of described pressure release breach.
The diameter dimension of described baroport is: 2mm≤diameter≤5mm; The degree of depth of described baroport and the ratio of diameter: H/D 〉=2.5.
The end face of described pressure release breach is the inclined-plane, with the angle of butterfly sheet center line be 26 ° ± 2 °.
The sectional shape of described pressure release breach is a rectangle or trapezoidal.
The width of described pressure release breach is 8-24mm, and depth dimensions is less than half of the oblique exradius of butterfly sheet.
Described pressure release breach is not less than 3mm in width direction minor face size, long limit size is not more than 24mm; Size is less than half of the oblique exradius of butterfly sheet on depth direction.
The top margin of the front end axial cross section of described pressure limiting packed-piston is the circular arc limit, 10mm≤radius of arc≤120mm, action 0.5-2.5mm.
Described spring end cap is made up of sleeve and top cover, and its inside offers the inner chamber that is used for ccontaining pressure limiting spring, and the sleeve cylindrical is provided with screw thread, offers first vent on the end face of top cover, with described intracavity inter-connection.
Described first vent is one, is opened in the central position of top cover end face;
Perhaps, described first vent is a plurality of, and symmetry is offered on the top cover end face.
Also offer second vent on the end face of described top cover, offer in the peripheral symmetry of described first vent.
Described sleeve cylindrical is provided with boss at the front end of screw thread, and the height of described boss is 1-5mm.
Offer the tamper hole on the described boss, diameter is 1-6mm.
On the described pressure limiting device housing, offer a plurality of the 3rd vents, radially evenly offer along the pressure limiting device housing; Offering after the pressure limiting packed-piston confined planes that the position is positioned at spring end cap the place ahead of described the 3rd vent.
In sum, the utility model is simple and compact for structure, reduces the resistance to motion of pressure limiting packed-piston, reduces exhaust gas leakage, effectively controls the position and the movement travel of pressure limiting packed-piston; Prevent that effectively the butterfly sheet from closing self-locking, guarantee the effective exercise of butterfly sheet, the fitted seal of butterfly sheet and pressure limiting packed-piston is good, the exhaust back pressure value during the raising low engine speed; The vent that many places are offered, guaranteed the unobstructed of pressure limiting device housing inner chamber in the exhaust brake butterfly valve and atmosphere, resistance of air when guaranteeing the to-and-fro motion of pressure limiting packed-piston is zero, effectively regulates and control engine exhaust back pressure and heat radiation in time, prevents pressure limiting spring Yin Gaowen and loses efficacy.
Below in conjunction with the drawings and specific embodiments the technical solution of the utility model is described in detail.
Description of drawings
Fig. 1 is the overall structure schematic representation of the utility model exhaust brake butterfly valve;
Fig. 2 is the local baroport of the valve body of the utility model exhaust brake dish valve schematic representation of arranging;
Fig. 3 is one of the utility model pressure limiting packed-piston structural representation;
Fig. 4 is two of the utility model pressure limiting packed-piston structural representation;
Fig. 5 is one of the utility model butterfly chip architecture schematic representation;
Fig. 6 A is two of the utility model butterfly chip architecture schematic representation;
Fig. 6 B is three of the utility model butterfly chip architecture schematic representation;
Fig. 7 is the overall structure schematic representation of the utility model spring end cap;
Fig. 8 A is the structural representation of the utility model butterfly sheet open mode;
Fig. 8 B is the structural representation of the utility model butterfly sheet closed condition;
Fig. 9 is one of pressure limiting device structural representation in the utility model exhaust brake dish valve;
Figure 10 be in the utility model exhaust brake dish valve the pressure limiting device structural representation two.
Embodiment
Fig. 1 is the overall structure schematic representation of the utility model exhaust brake butterfly valve.As shown in Figure 1, the utility model provides a kind of exhaust brake butterfly valve, comprises valve body 1, is provided with butterfly sheet 30 in the valve body, and the edge of butterfly sheet 30 offers pressure release breach 31; Described butterfly sheet 30 is fixed in valve body 1 inner chamber by rotating shaft 11, described butterfly sheet 30 links to each other with operating device, it is to overturn in valve body 1 inner chamber in the center with rotating shaft 11 that operating device drives butterfly sheet 30, when butterfly sheet 30 is closed valve body 1 inner chamber is divided into air-inlet cavity and exhaust cavity; Described valve body 1 is provided with pressure limiting device, comprise the pressure limiting device housing 1 that is arranged on valve body 1 sidewall, the bottom of pressure limiting device housing 1 is provided with spring end cap 40, be slidingly fitted with pressure limiting packed-piston 20 in the described pressure limiting device housing 1, described pressure limiting packed-piston comprises piston only, this piston only is stepped, is made up of the tappet 21 on top and the bearing 22 of bottom, and the diameter of tappet 21 is less than the diameter of bearing 22; Offer first annular groove 211 on the outer surface of described tappet 21; Described tappet 21 protrudes out valve body 1 inner chamber by being opened in the perforate 100 on valve body 1 inwall, and corresponding inserted is in described pressure release breach 31; Described bearing 22 is arranged in the pressure limiting device housing 8; Also offer baroport 9 on described perforate 100 outsides, the air-inlet cavity wall; Described first annular groove 211 is positioned at the perforate inboard on the valve interior wall; Described bearing 22 bottoms are equipped with pressure limiting spring 7, and this pressure limiting spring 7 is replaced mutually with spring end cap 40.In order to guarantee the space of pressure limiting packed-piston 20, be provided with the gap between described bearing 22 upper-end surfaces 224 and pressure limiting device housing 8 inwalls 81.
Fig. 2 is the local baroport of the valve body of the utility model exhaust brake dish valve schematic representation of arranging.As shown in Figure 2, the quantity of the baroport 9 that the utility model is offered in valve body is 2-5, the center line angle of outermost two baroports 9 is not more than 120 °, and when butterfly sheet 30 was closed, described baroport 9 was positioned at the valve body suction port end of described pressure release breach 31.The diameter dimension of described baroport 9 is: 2mm≤diameter≤5mm; The degree of depth of described baroport 9 and the ratio of diameter: H/D 〉=2.5.
Fig. 3 is one of the utility model pressure limiting packed-piston structural representation.As shown in Figure 3, pressure limiting packed-piston of the present utility model comprises piston only, and this piston only is stepped, is made up of the tappet 21 on top and the bearing 22 of bottom, and the diameter of tappet 21 is less than the diameter of bearing 22.The top margin of the front end axial cross section of pressure limiting packed-piston 20 is the circular arc limit, 10mm≤radius of arc≤120mm, action 0.5-2.5mm.Offer first annular groove 211 on the outer surface of described tappet 21.The quantity of offering of described first annular groove 211 is more than one, and the interval between adjacent two first annular grooves 211 is not less than 2mm.Offer second annular groove 221 on the outer surface of described bearing 22.The quantity of offering of described second annular groove 221 is more than one, and the interval between adjacent two second annular grooves 221 is not less than 2mm.The cell body sectional shape of described first annular groove 211 and/or second annular groove 221 is semicircle, trapezoidal, U-shaped or rectangle.The groove depth size and the groove width size of described first annular groove 211 and second annular groove 221 are respectively: 0.1mm≤groove depth≤0.5mm, 0.3mm≤groove width≤2.5mm.As shown in Figure 3, described tappet 21 upper and lower circumferential surfacies offer plat part 212 respectively, plat part 212 is offered towards bearing 22 directions from the top of tappet 21, width 〉=the 2.5mm of plat part 212, the CLV ceiling limit value of width is less than the radius of tappet 21, the length of plat part 212 is less than the distance of described tappet end 213 to described first annular groove 211, the distance 〉=2.5mm of end-to-end distance first annular groove 211 of plat part 212.
For the ease of installing and locating, offer guiding groove 223 on the cylindrical of described bearing 22, described guiding groove 223 is identical with the center symmetry plane of described plat part 212; The width of described guiding groove 223 is 3-6mm, and the degree of depth is 1.8-4mm, and length is 5-20mm.
As shown in Figure 3, described bearing 22 inside offer spring mounting hole 222, and according to the progression requirement of pressure limiting spring, this spring mounting hole 222 is blind hole 2221 or shoulder hole 2222, and its degree of depth is less than bearing 22 length.In the embodiment shown in fig. 3, this spring mounting hole 222 is blind hole 2221.Wall thickness dimension between the inwall of described spring mounting hole 222 and guiding groove 223 bottom lands, 2mm≤wall thickness≤8mm, the diameter of blind hole 2221 are 5-21mm.
Fig. 4 is two of the utility model pressure limiting packed-piston structural representation.As shown in Figure 4, the pressure limiting spring adopts the twin-stage spring in the present embodiment, and therefore, spring mounting hole 222 is shoulder hole 2222, and wherein the diameter in the big footpath of shoulder hole 2222 is 5-21mm, and the diameter of path is 5-16mm.
Fig. 5, Fig. 6 A and Fig. 6 B be respectively one of the utility model butterfly chip architecture schematic representation, two and three.As Fig. 5 and in conjunction with shown in Fig. 6 A and Fig. 6 B, offer pressure release breach 31 on the butterfly sheet 30 in the utility model exhaust brake butterfly valve, the end face of described pressure release breach 31 is the inclined-plane, with the angle of butterfly sheet 30 center lines be 26 ° ± 2 °.As required, the sectional shape of described pressure release breach 31 is a rectangle or trapezoidal.Generally, the width of pressure release breach 31 is 8-24mm, and depth dimensions is less than half of the oblique exradius of butterfly sheet.Pressure release breach 31 is not less than 3mm in width direction minor face size, long limit size is not more than 24mm; Size is less than half of butterfly sheet 30 oblique exradius on depth direction.
Fig. 7 is the overall structure schematic representation of the utility model spring end cap.As shown in Figure 7, spring end cap 40 in the utility model exhaust brake butterfly valve, form by sleeve 42 and top cover 43, its inside offers the inner chamber 44 that is used for ccontaining pressure limiting spring 7, sleeve 42 cylindricals are provided with screw thread, offer first vent 401 on the end face of top cover 43, be connected with described inner chamber 44.As required, described first vent 401 can be one, is opened in the central position of top cover 43 end faces; Perhaps, described first vent 401 is a plurality of, and symmetry is offered on top cover 43 end faces.Also offer second vent 402 on the end face of described top cover, offer in the peripheral symmetry of described first vent 401.Described sleeve 42 cylindricals are provided with boss 46 at the front end of screw thread, and the height of described boss 46 is 1-5mm.Offer tamper hole 45 on the described boss 46, when diameter was the 1-6mm diameter of working as tamper hole 45 greater than the height of boss 46, tamper hole 45 formed a slot on boss 46, the corresponding setting of pin that is provided with pressure limiting device housing 8.On the described pressure limiting device housing 8, offer a plurality of the 3rd vents 403, radially evenly offer along pressure limiting device housing 8; Offering after pressure limiting packed-piston 20 confined planes that the position is positioned at spring end cap 40 the place aheads of described the 3rd vent 403, be sealing reliably to be arranged on the total travel that moves in order to ensure pressure limiting packed-piston 20, its head pressure is the back pressure of butterfly valve, and its afterbody pressure is barometric pressure.
Fig. 8 A is that structural representation, Fig. 8 B of the utility model butterfly sheet open mode is the structural representation of the utility model butterfly sheet closed condition.As Fig. 8 A and in conjunction with shown in Fig. 8 B, the working procedure of the utility model exhaust brake butterfly valve is such: the cylinder 2 of exhaust brake butterfly valve is single-acting cylinder, the piston rod side of single-acting cylinder is equipped with Returnning spring 5, when the suction port of the cylinder 2 of exhaust brake butterfly valve stops air feed and connects atmosphere by the control loop of automobile auxiliary braking, butterfly valve is not worked, that is to say because butterfly sheet 30 is in open mode, pressure limiting packed-piston 20 is under the effect of pressure limiting spring 7, the front end end face 224 of pressure limiting packed-piston bearing 22 withstands on pressure limiting device housing 8 inwalls 81 of valve body 1, thereby pressure limiting device housing baroport 9 is implemented end face seal, at this moment because butterfly valve is in open mode, the gas pressure of butterfly valve overcurrent is low, and gas pressure only acts on the area of tappet 21 heads of pressure limiting packed-piston 20 and pressure limiting device housing baroport 9, low pressure and less relatively lifting surface area can't make pressure limiting packed-piston 20 overcome the pretightening force of pressure limiting spring 7 and retreat; The waste gas of decision engine combustion can not be entered pressure limiting device inside by baroport 9, this moment, the waste gas of minute quantity can be ignored by the pressure limiting piston 20 and the leakage in valve body 1 gap, and waste gas can only be discharged by the exhaust butterfly valve by two side canals of butterfly sheet 30 in the valve body.
When the auxiliary braking control loop of automobile is ventilated to the suction port of cylinder 2, the piston rod of cylinder 2 stretches out, drive the key seat that links to each other, key seat drives rotating shaft 11 by Rocker arm assembly, rotating shaft 11 drives 30 rotations of butterfly sheet, butterfly sheet 30 begins to close, when butterfly sheet 30 rotates to several angle, the pressure release breach 31 of butterfly sheet will contain tappet 21 heads of pressure limiting packed-piston, pressure release breach 31 end faces of butterfly sheet 30 will be pressed on the pressure limiting packed-piston tappet 21 head arc shaped surfaces 213, but butterfly sheet 30 is not closed fully at this moment, along with butterfly sheet 30 is further closed, pressure limiting packed-piston 20 will move backward, bearing 22 heads 224 of pressure limiting piston will leave pressure limiting device housing 8 inwalls 81 end faces of valve body 1, at this moment, because the pressurized gas before the butterfly valve cut-off valve enter the static pressure feedback cavity, the lifting surface area of the packed-piston of butterfly valve pressure limiting is this moment expanded as the sectional area that annulus area that pressure limiting packed-piston bearing 22 areas deduct tappet 21 is added the inlet end that is sealed in sealing surface or line one side that is formed by butterfly sheet 30 and pressure limiting packed-piston tappet 21 heads.In the pretightening force of pressure limiting spring 7 during greater than the product of the compression area of back pressure and pressure limiting packed-piston 20, pressure limiting packed-piston tappet 21 head arc shaped surfaces will keep and the contacting of pressure release breach 31 end faces of butterfly sheet 30, that is to say that the back pressure value is less than the back pressure value of setting before the valve of the butterfly valve of this moment.The rising of back pressure value before along with the butterfly valve valve, when the product of the compression area of back pressure before the valve and pressure limiting packed-piston 20 during greater than the pretightening force of pressure limiting spring 7, pressure limiting packed-piston 20 will continue to move to spring end cap 40 directions, and along with the raising of back pressure before the valve, when back pressure before the valve reaches the highest setting pressure of pressure limiting device, pressure limiting packed-piston 20 will move to the position that the front-end face of the ear end face of pressure limiting packed-piston bearing 21 and spring end cap 40 offsets, and the pressure regulation of pressure limiting device also will reach capacity.
Pressure limiting device embodiment one
Fig. 9 is the structural representation of pressure limiting device embodiment one in the utility model exhaust brake butterfly valve.As shown in Figure 9, when the pressure limiting device of butterfly valve adopts the structure of single-stage spring, thereby for guarantee pressure limiting spring 7 within it portion because of stressed and crooked influence butterfly valve set pressure limiting power accurately, bearing 22 afterbodys at the pressure limiting packed-piston are provided with spring mounting hole, utilize the external diameter of spring mounting hole that pressure limiting spring 7 is positioned, its mounting hole will be arranged to blind hole, and the degree of depth of its blind hole is less than bearing 22 length, more require more than or equal to the 2 times helical pitches of spring in the pretension stress, thus guarantee the pressure limiting spring do not have after stressed deviate from may.First vent 401 on the spring end cap 40 of exhaust brake butterfly valve can be one, is opened in the central position of top cover 43 end faces; Can be a plurality ofly, symmetry is offered on top cover 43 end faces; Also can offer second vent 402 in first vent, the 401 peripheral symmetries of the central position of top cover 43 end faces.
Pressure limiting device embodiment two
Figure 10 is the structural representation of pressure limiting device embodiment two in the utility model exhaust brake butterfly valve.As shown in figure 10, when the pressure that butterfly valve is set higher, when pressure limiting device adopts the structure of single-stage spring can't satisfy pressure regulation to require, the pressure limiting device setting can be adopted the twin-stage spring structure of two pressure limiting springs, but it obviously is impossible that this structure positions two springs as the inner spring mounting hole that still adopts bearing 22 afterbodys at the pressure limiting packed-piston that a blind hole structure is set, if can not locate reliably to two springs, when spring stress bends, two springs certainly will twine, and it can't be played a role.Under these circumstances, adopt arbor structure, that is: adopt 73 pairs of little springs 72 of little spring positioning and guiding bar to position, and continue to adopt spring mounting hole that big spring 71 is positioned.And little spring positioning and guiding bar 73 is the reliability of guaranteeing to locate because diameter is thinner, and little spring 72 is adopted the overall length orientation type.Need be at pressure limiting packed-piston 20 along the axial motion of little spring positioning and guiding bar 73, therefore bearing 22 afterbodys at the pressure limiting packed-piston need have shoulder hole 2222, to make things convenient for entering of little spring positioning and guiding bar 73, can all realize that the overall length of 73 pairs of little springs 72 of little spring positioning and guiding bar is reliable with what guarantee to locate in the total travel of pressure limiting packed-piston 20.The inner chamber 44 of spring end cap 40 is a stepped shaft, can symmetry offer first vent 401 on the end face of top cover 43.
In sum, the utility model is simple and compact for structure, reduces the resistance to motion of pressure limiting packed-piston, reduces exhaust gas leakage, effectively controls the position and the movement travel of pressure limiting packed-piston; Prevent that effectively the butterfly sheet from closing self-locking, guarantee the effective exercise of butterfly sheet, the fitted seal of butterfly sheet and pressure limiting packed-piston is good, the exhaust back pressure value during the raising low engine speed; The vent that many places are offered, guaranteed the unobstructed of pressure limiting device housing inner chamber in the exhaust brake butterfly valve and atmosphere, resistance of air when guaranteeing the to-and-fro motion of pressure limiting packed-piston is zero, effectively regulates and control engine exhaust back pressure and heat radiation in time, prevents pressure limiting spring Yin Gaowen and loses efficacy.
Need to prove that therefore the usefulness of only giving an example among above-described each embodiment do not limit protection domain of the present utility model, can do simple the variation or modification as required.
Claims (23)
1. an exhaust brake butterfly valve comprises valve body (1), is provided with butterfly sheet (30) in the valve body, and the edge of butterfly sheet (30) offers pressure release breach (31); Described butterfly sheet (30) is fixed in valve body (1) inner chamber by rotating shaft (11), described butterfly sheet (30) links to each other with operating device, it is to overturn in valve body (1) inner chamber in the center with rotating shaft (11) that operating device drives butterfly sheet (30), and butterfly sheet (30) is divided into air-inlet cavity and exhaust cavity with valve body (1) inner chamber when closing; Described valve body (1) is provided with pressure limiting device, comprises the pressure limiting device housing (8) that is arranged on valve body (1) sidewall, and the bottom of pressure limiting device housing (8) is provided with spring end cap (40), it is characterized in that,
Be slidingly fitted with pressure limiting packed-piston (20) in the described pressure limiting device housing (8), described pressure limiting packed-piston comprises piston only, this piston only is stepped, is made up of the tappet (21) on top and the bearing (22) of bottom, and the diameter of tappet (21) is less than the diameter of bearing (22); Offer first annular groove (211) on the outer surface of described tappet (21)
Described tappet (21) protrude out valve body (1) inner chamber, and corresponding inserted is in described pressure release breach (31) by being opened in the perforate (100) on valve body (1) inwall; Described bearing (22) is arranged in the pressure limiting device housing (8);
Also offer baroport (9) on described perforate (100) outside, the air-inlet cavity wall; Described first annular groove (211) is positioned at the perforate inboard on the valve interior wall; Described bearing (22) bottom is equipped with pressure limiting spring (7), and this pressure limiting spring (7) is replaced mutually with spring end cap (40).
2. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, is provided with the gap between described bearing (22) upper-end surface (224) and pressure limiting device housing (8) inwall (81).
3. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, the quantity of offering of described first annular groove (211) is more than one, and the interval between adjacent two first annular grooves (211) is not less than 2mm.
4. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, offers second annular groove (221) on the outer surface of described bearing (22).
5. exhaust brake butterfly valve as claimed in claim 3 is characterized in that, the quantity of offering of described second annular groove (221) is more than one, and the interval between adjacent two second annular grooves (221) is not less than 2mm.
6. as each described exhaust brake butterfly valve of claim 1-5, it is characterized in that the cell body sectional shape of described first annular groove (211) and/or second annular groove (221) is semicircle, trapezoidal, U-shaped or rectangle.
7. exhaust brake butterfly valve as claimed in claim 6 is characterized in that, the groove depth size and the groove width size of described first annular groove (211) and second annular groove (221) are respectively: 0.1mm≤groove depth≤0.5mm, 0.3mm≤groove width≤2.5mm.
8. exhaust brake butterfly valve as claimed in claim 1, it is characterized in that, the upper and lower circumferential surface of described tappet (21) offers plat part (212) respectively, plat part (212) is offered towards bearing (22) direction from the top of tappet (21), width 〉=the 2.5mm of plat part (212), the CLV ceiling limit value of width is less than the radius of tappet (21), the length of plat part (212) is less than the distance of described tappet end (213) to described first annular groove (211), the distance 〉=2.5mm of end-to-end distance first annular groove (211) of plat part (212).
9. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, offers guiding groove (223) on the cylindrical of described bearing (22), and described guiding groove (223) is identical with the center symmetry plane of described plat part (212); The width of described guiding groove (223) is 3-6mm, and the degree of depth is 1.8-4mm, and length is 5-20mm.
10. exhaust brake butterfly valve as claimed in claim 9 is characterized in that, described bearing (22) inside offers spring mounting hole (222), and this spring mounting hole (222) is blind hole (2221) or shoulder hole (2222), and its degree of depth is less than bearing (22) length; Wall thickness dimension between the inwall of described spring mounting hole (222) and guiding groove (223) bottom land, 2mm≤wall thickness≤8mm;
The diameter of described blind hole (2221) is 5-21mm; The diameter in the big footpath of described shoulder hole (2222) is 5-21mm, and the diameter of the path of shoulder hole (2222) is 5-16mm.
11. exhaust brake butterfly valve as claimed in claim 1, it is characterized in that, the quantity of described baroport (9) is 2-5, the center line angle of outermost two baroports (9) is not more than 120 °, and when closing, described baroport (9) is positioned at the valve body suction port end of described pressure release breach (31) at butterfly sheet (30).
12. exhaust brake butterfly valve as claimed in claim 11 is characterized in that, the diameter dimension of described baroport (9) is: 2mm≤diameter≤5mm; The degree of depth of described baroport (9) and the ratio of diameter: H/D 〉=2.5.
13. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, the end face of described pressure release breach (31) is the inclined-plane, with the angle of butterfly sheet (30) center line be 26 ° ± 2 °.
14. exhaust brake butterfly valve as claimed in claim 13 is characterized in that, the sectional shape of described pressure release breach (31) is a rectangle or trapezoidal.
15. exhaust brake butterfly valve as claimed in claim 14 is characterized in that, the width of described pressure release breach (31) is 8-24mm, and depth dimensions is less than half of the oblique exradius of butterfly sheet.
16. the butterfly sheet of exhaust brake butterfly valve as claimed in claim 14 is characterized in that, described pressure release breach (31) is not less than 3mm in width direction minor face size, long limit size is not more than 24mm; Size is less than oblique half of exradius of butterfly sheet (30) on depth direction.
17. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, the top margin of the front end axial cross section of described pressure limiting packed-piston (20) is the circular arc limit, 10mm≤radius of arc≤120mm, action 0.5-2.5mm.
18. exhaust brake butterfly valve as claimed in claim 1, it is characterized in that, described spring end cap (40), form by sleeve (42) and top cover (43), its inside offers the inner chamber (44) that is used for ccontaining pressure limiting spring (7), sleeve (42) cylindrical is provided with screw thread, offers first vent (401) on the end face of top cover (43), is connected with described inner chamber (44).
19. exhaust brake butterfly valve as claimed in claim 18 is characterized in that, described first vent (401) is one, is opened in the central position of top cover (43) end face;
Perhaps, described first vent (401) is a plurality of, and symmetry is offered on top cover (43) end face.
20. exhaust brake butterfly valve as claimed in claim 19 is characterized in that, also offers second vent (402) on the end face of described top cover, offers in the peripheral symmetry of described first vent (401).
21. exhaust brake butterfly valve as claimed in claim 20 is characterized in that, described sleeve (42) cylindrical is provided with boss (46) at the front end of screw thread, and the height of described boss (46) is 1-5mm.
22. exhaust brake butterfly valve as claimed in claim 21 is characterized in that, offers tamper hole (45) on the described boss (46), diameter is 1-6mml.
23. exhaust brake butterfly valve as claimed in claim 1 is characterized in that, on the described pressure limiting device housing (8), offers a plurality of the 3rd vents (403), radially evenly offers along pressure limiting device housing (8); Offering after pressure limiting packed-piston (20) confined planes that the position is positioned at spring end cap (40) the place ahead of described the 3rd vent (403).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200264919U CN201963407U (en) | 2011-01-25 | 2011-01-25 | Exhaust brake butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200264919U CN201963407U (en) | 2011-01-25 | 2011-01-25 | Exhaust brake butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201963407U true CN201963407U (en) | 2011-09-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200264919U Expired - Fee Related CN201963407U (en) | 2011-01-25 | 2011-01-25 | Exhaust brake butterfly valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201963407U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182566A (en) * | 2011-01-25 | 2011-09-14 | 浙江亿日气动科技有限公司 | Exhausting brake butterfly valve |
| CN102852650A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure limiting and air leaking auxiliary brake valve device with supporting guide sleeve |
| CN102852652A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure-limiting venting auxiliary brake valve device with air vent screw plug |
| CN102852653A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure-limiting venting auxiliary brake valve device with channeled drive shaft |
| CN102889139A (en) * | 2012-10-25 | 2013-01-23 | 浙江亿日气动科技有限公司 | Pressure-limit air-leakage auxiliary braking valve device with air vent of piston tappet sleeve |
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2011
- 2011-01-25 CN CN2011200264919U patent/CN201963407U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182566A (en) * | 2011-01-25 | 2011-09-14 | 浙江亿日气动科技有限公司 | Exhausting brake butterfly valve |
| CN102852650A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure limiting and air leaking auxiliary brake valve device with supporting guide sleeve |
| CN102852652A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure-limiting venting auxiliary brake valve device with air vent screw plug |
| CN102852653A (en) * | 2012-09-18 | 2013-01-02 | 浙江亿日气动科技有限公司 | Pressure-limiting venting auxiliary brake valve device with channeled drive shaft |
| CN102852650B (en) * | 2012-09-18 | 2015-12-30 | 浙江亿日气动科技有限公司 | Have and support the pressure limiting of guide pin bushing and to lose heart auxiliary braking control valve unit |
| CN102852652B (en) * | 2012-09-18 | 2016-02-03 | 浙江亿日气动科技有限公司 | The pressure limiting of air vent screw plug is had to lose heart auxiliary braking control valve unit |
| CN102889139A (en) * | 2012-10-25 | 2013-01-23 | 浙江亿日气动科技有限公司 | Pressure-limit air-leakage auxiliary braking valve device with air vent of piston tappet sleeve |
| CN102889139B (en) * | 2012-10-25 | 2015-12-30 | 浙江亿日气动科技有限公司 | Have bucket tappet to overlap the pressure limiting of pore to lose heart auxiliary braking control valve unit |
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