CN104564360A

CN104564360A - Brake butterfly valve

Info

Publication number: CN104564360A
Application number: CN201410674823.2A
Authority: CN
Inventors: 陆应生; 王君
Original assignee: GUILIN XINYI REFRIGERATION EQUIPMENT Co Ltd
Current assignee: GUILIN XINYI REFRIGERATION EQUIPMENT Co Ltd
Priority date: 2014-11-21
Filing date: 2014-11-21
Publication date: 2015-04-29

Abstract

The invention relates to a brake butterfly valve. The brake butterfly valve comprises a valve body, a rotating shaft, a valve plate and a power mechanism, wherein the valve plate is fixedly arranged in an inner cavity in the valve body through the rotating shaft, the valve plate is connected with the power mechanism, the power mechanism drives the valve plate to overturn in the inner cavity by taking the rotating shaft as the center, the inner cavity is separated into an air inlet cavity and an air outlet cavity when the valve plate is switched off, a sealing ring which is used for forming sealing connection with the cavity wall of the inner cavity is fixedly arranged on the valve plate, and sealing surfaces between the sealing ring and the cavity wall of the inner cavity are staggered by a hollow part on the sealing ring. The brake butterfly valve disclosed by the invention has the beneficial effects that the hollow part which is not in contact with the cavity wall of the inner cavity is arranged on the sealing ring and enables the sealing surfaces to be arranged in a staggered way, the area, which is in contact with the inner cavity, of the sealing ring is reduced on the premise that enough width of the sealing ring is ensured, the sealing ring is easily subjected to extrusion deformation to reduce the operation torque when the valve plate is switched on/off, the energy consumption of an engine is reduced, the flexibility of switching on and off the valve plate is ensured, and normal running of an exhaust brake function of the engine is ensured.

Description

A kind of braking butterfly valve

Technical field

The present invention relates to a kind of braking butterfly valve.

Background technique

Along with the requirement of commercial car to braking system is increased, only rely on the user demand that can not meet client to the upgrading of traditional braking system completely, the auxiliary braking so arisen at the historic moment, although auxiliary braking does not reach primary brake system and exports so large braking force, but car load needs to utilize auxiliary braking both to reduce the wearing and tearing of friction plate when slowing down in the process of moving, can also play the effect of braking deceleration.Exhaust brake is a kind of retarding braking of auxiliary driving braking action, and its structure is simple, low price, is widely used on diesel-powered truck or passenger vehicle.Exhaust and brake system normally installs an exhaust brake butterfly valve at engine exhaust pipe place, and when exhaust brake is inoperative, valve block opens, outlet pipe conducting, does not affect the normal work of motor, when exhaust brake works, the cylinder of braking butterfly valve accepts the energy from motor, piston in cylinder promotes axis of rotation, thus valve block is closed, outlet pipe blocks, the fuel feeding of the mandatory cut-out motor of oil-break mechanism simultaneously, the automobile travelled drives engine crankshaft to rotate, engine piston is in exhaust stroke, the gas of discharging is compressed because braking valve block is closed, produce pressure, motor is worked as gas compressor, when being made exhaust by the gas compressed, piston stroking upward produces resistance, increase the loss of calming the anger of motor, thus serve braking effect.

In exhaust brake butterfly valve manufactures and designs, the intensity of seal ring directly limit the maximum permissible pressure of valve body, the cooperate degree of valve seat and seal ring directly affects valve leak grade, and the linkage structure of rotating shaft and valve block have impact on valve body processing and assembling and in actual conditions, opens and closes the safety rate of valve block.Existing exhaust brake butterfly valve, comprise valve body, rotating shaft, valve block and power mechanism, valve block is fixed in the inner chamber of valve body by rotating shaft, valve block is connected with power mechanism, and power mechanism band moving valve plate overturns centered by rotating shaft in described inner chamber, when valve block is closed, inner chamber is separated into air-inlet cavity and exhaust cavity, valve block is fixed with for forming with air-inlet cavity the seal ring be tightly connected, the whole outer ring of seal ring all seals with air-inlet cavity and contacts, and therefore have higher intensity, anti-leak result is remarkable.But the seal ring elasticity of this structure is poor, belongs to pressure forced seal between seal ring and inner chamber, so the operation moment of torsion that valve block is opened when closing is comparatively large, adds the energy loss of motor, also have impact on valve block and open the flexibility ratio of closing.

Therefore, be necessary to improve existing exhaust brake butterfly valve, make the contact between the outer ring of its seal ring and inner chamber more reasonable, area of contact is reduced on the basis ensureing leakage effect, make seal ring be easy to extrusion-deformation, open operation moment of torsion when closing to reduce valve block, reduce the energy loss of motor, ensure that valve block opens the flexibility ratio of closing, ensure the normal operation of engine exhaust and brake function.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of braking butterfly valve, solves the deficiencies in the prior art.

The technological scheme that the present invention solves the problems of the technologies described above is as follows: a kind of braking butterfly valve, it is characterized in that: comprise valve body, rotating shaft, valve block and power mechanism, described valve block is fixed in the inner chamber of described valve body by described rotating shaft, described valve block is connected with described power mechanism, described power mechanism drives described valve block to overturn in described inner chamber centered by described rotating shaft, described inner chamber is separated into air-inlet cavity and exhaust cavity when closing by described valve block, described valve block is fixed with for forming with the chamber wall of described inner chamber the seal ring be tightly connected, sealing surface between described seal ring and described inner chamber chamber wall is staggered by the hollow part on described seal ring, the outer peripheral surface of described seal ring forms described hollow part in the mode of part indent, the outer peripheral surface center indent of described seal ring, make the longitudinal section of described outer ring in " U " shape, the both sides of described hollow part are sealed department, and described hollow part is equal with the horizontal width of described sealed department, described valve block is stepped ringwise towards the side of described air-inlet cavity, and described seal ring is set in higher level's ladder and the trim ring being set in subordinate's ladder presses.

The invention has the beneficial effects as follows: the present invention by arranging the hollow part do not contacted with the chamber wall of inner chamber on seal ring, sealing surface is staggered setting, ensureing to reduce under seal ring has the prerequisite of enough width the area of contact of itself and inner chamber, seal ring is made to be easy to extrusion-deformation, to reduce operation moment of torsion when valve block opens and closes, reduce the energy loss of motor, ensure that valve block opens the flexibility ratio of closing, ensure the normal operation of engine exhaust and brake function; Structure of the present invention is simple, easy to use, has highly application value.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is the enlarged view at A place in Fig. 1;

Fig. 3 is the enlarged view at B place in Fig. 1.

Embodiment

Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.

As Fig. 1, Fig. 2, shown in Fig. 3, the engine exhaust and brake butterfly valve of the present embodiment, comprise valve body 1, rotating shaft 2, valve block 3 and power mechanism 4, described valve block 3 is fixed in the inner chamber of described valve body 1 by described rotating shaft 2, described valve block 3 is connected with described power mechanism 4, described power mechanism 4 drives described valve block 3 to overturn in described inner chamber centered by described rotating shaft 2, when described valve block 3 is closed, described inner chamber is separated into air-inlet cavity 51 and exhaust cavity 52, described valve block 3 is fixed with for forming with the chamber wall of described inner chamber the seal ring 6 be tightly connected, sealing surface between described seal ring 6 and described inner chamber chamber wall is staggered by the hollow part 61 on described seal ring 6, this exhaust brake butterfly valve is preferably eccentric-butterfly-valve, is installed in engine exhaust pipe place, valve body 1 and valve block 3 all adopt resistant to elevated temperatures ductile cast iron material manufacture to form, and its reliability is high, power mechanism 4 is cylinder or vacuum servo cylinder, the piston rod being provided with piston in it and driving rotating shaft 2 to move, under normal vehicle operation state, the waste gas streams of motor is discharged after exhaust brake butterfly valve, when needs are braked, the control system of vehicle controls power mechanism 4 and moves, power mechanism 4 overturns certain angle with moving valve plate 3 and the seal ring 6 on valve block 3 is formed with valve body 1 inner chamber chamber wall and is tightly connected, be closed air-inlet cavity 51 and exhaust cavity 52 by lumen segmentation, the waste gas that motor is discharged is intercepted in air-inlet cavity 51, forms engine exhaust and brake, seal ring 6 ring set is outer and dock to be formed to seal with inner chamber chamber wall phase shape adaptation at valve block 3, by arranging the hollow part do not contacted with the chamber wall of inner chamber on seal ring 6, sealing surface is staggered setting, ensureing the area of contact reducing itself and inner chamber under seal ring 6 has the prerequisite of enough width, seal ring 6 is made to be easy to extrusion-deformation, to reduce operation moment of torsion when valve block 3 opens and closes, reduce the energy loss of motor, ensure valve block 3 flexibility ratios of closing, ensure the normal operation of engine exhaust and brake function, certainly, seal ring 6 also directly can not contact with the chamber wall of inner chamber, chamber wall can be provided be specifically designed to form with seal ring 6 stuffing box gland be tightly connected.

In the present embodiment, the outer peripheral surface of described seal ring 6 forms described hollow part 61 in the mode of part indent; Directly form hollow part 61 from the outer peripheral surface indent of seal ring 6, be conducive to simplified processing process and keep seal ring 6 intensity; Seal ring 6 is " O " type and is metal o-ring; Hollow part 6 can arrange one, and also can arrange multiple, its shape does not also limit, as long as can realize the function at sealing surface interval; Part indent, itself and the part of non-indent are and seal with inner chamber chamber wall the sealed department 62 contacted; As for ratio and the distribution of female parts, then need to take into account good sealing effect; Hollow part 61 does not contact with inner chamber chamber wall, but just allow the sealed department 62 of side be squeezed Shi Xiangqi distortion, make seal ring 6 be easy to extrusion-deformation.

In the present embodiment, the outer peripheral surface center indent of described seal ring 6, make the longitudinal section of described outer ring in " U " shape, the both sides of described hollow part 61 are sealed department 62, and described hollow part 61 is equal with the horizontal width of described sealed department 62; Seal ring 6 outer peripheral surface is a part for an external conical surface spatially, namely has certain inclination, makes the sealing surface of sealed department 62 in the plane of same inclination, is conducive to formation and is tightly connected; Hollow part 6 is positioned at center, outer ring, and its degree of depth is the half of outer ring width; Hollow part 61 is equal with the horizontal width of sealed department 62, is 1/3rd of outer ring width, is convenient to process the uniformity simultaneously maintaining seal ring 6 to greatest extent.

In the present embodiment, described valve block 3 is stepped ringwise towards the side of described air-inlet cavity 51, and described seal ring 5 is set in higher level's ladder 31 and the trim ring 7 being set in subordinate's ladder 32 presses; Seal ring 6 is sleeved on higher level's ladder 31, and trim ring 7 is sleeved on subordinate's ladder 32 and contacts with seal ring 6 forming surface, and trim ring 7 and seal ring 6 are fixed on the outer edge of valve block 3 by hold-down bolt by the fixed hole on trim ring 7 and valve block 3; For further Leakage prevention, before seal ring 6 is sleeved on higher level's ladder 31, also must be set with one deck pad; The overall width of seal ring 6 is slightly larger than the bottom width of higher level's ladder 31, and in the process of tightening hold-down bolt gradually, trim ring 7 can produce transverse shear stress to seal ring 6 and makes it that resiliently deformable occur, and produces pretightening force.

In the present embodiment, the bottom of described valve body 1 is provided with pressure limiting road 8, is provided with the pressure limiting device of the pressure of being partial to described air-inlet cavity 51 side for reducing engine exhaust conduit in described pressure limiting road 8; Exhaust brake relies on the back pressure produced in air-inlet cavity 51 to realize, because the rotating speed of motor changes within the specific limits, so back pressure is also in continuous change, along with the raising of engine speed, back pressure is also increasing, and the force value exceeding motor license will work the mischief to motor itself; Pressure limiting road 8 can be the duct of a connection outlet pipe bottom valve body 1, has pressure limiting device, can outlet pipe 52 be made when back pressure reaches limit value to be communicated with in it, makes waste gas obtain discharge to regulate pressure, ensures the Security of exhaust brake; The size in pressure limiting road 8 adapts to structure with the shell shape size of valve body 1.

In the present embodiment, described pressure limiting device is piston type pressure-limit valve 9, the bottom of described valve body 1 is also provided with the pore be communicated with described pressure limiting road 8, and described pore comprises opening and is positioned at the air inlet pore 81 of described air-inlet cavity 51 side and opening is positioned at described exhaust cavity 52 side exhaust pore 82; Pressure limiting road 8 only has one end open, and opening is towards exhaust cavity 52, and this opening is sealed by spring seat; Piston type pressure-limit valve 9 comprises the piston, spring, the spring seat that connect successively, and its structure is same as the prior art, does not repeat them here; Two ends, pressure limiting road 8 respectively with air inlet pore 81, be vented pore 82 and be tightly connected, make air-inlet cavity 51, exhaust cavity 52 be communicated with by pressure-limit valve 9; Its structure is simple, can reach good pressure release effect.

In the present embodiment, the opening of described air inlet pore 81 and exhaust pore 82 is all located at the chamber wall of described inner chamber, and described air inlet pore 81 and exhaust pore 82 are the tilted air holes of being partial to described rotating shaft 2 axis; Pore is designed to tilted air holes, makes the diameter of axle size in pressure limiting road 8 less, even if machining difference is wayward, valve body 1 also can be guaranteed in the intensity of this part, and saving the raw material manufactured needed for valve body 1, the weight alleviating valve body 1, to reduce automobile energy consumption, makes it move more smooth; Meanwhile, for straight hole and the inclined hole of same front and back end points, same diameter, the gas transmission path of the latter is longer, can ensure the smooth and easy work of pressure limiting device.

In the present embodiment, described air inlet pore 81 is identical with the angle that exhaust pore 72 is partial to described rotating shaft 2 axis; Same angle of inclination pore both facilitated batch process, also can maintain the degree of balance on valve body 1 both sides to greatest extent.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a braking butterfly valve, it is characterized in that: comprise valve body, rotating shaft, valve block and power mechanism, described valve block is fixed in the inner chamber of described valve body by described rotating shaft, described valve block is connected with described power mechanism, described power mechanism drives described valve block to overturn in described inner chamber centered by described rotating shaft, described inner chamber is separated into air-inlet cavity and exhaust cavity when closing by described valve block, described valve block is fixed with for forming with the chamber wall of described inner chamber the seal ring be tightly connected, sealing surface between described seal ring and described inner chamber chamber wall is staggered by the hollow part on described seal ring, the outer peripheral surface of described seal ring forms described hollow part in the mode of part indent, the outer peripheral surface center indent of described seal ring, make the longitudinal section of described outer ring in " U " shape, the both sides of described hollow part are sealed department, and described hollow part is equal with the horizontal width of described sealed department, described valve block is stepped ringwise towards the side of described air-inlet cavity, and described seal ring is set in higher level's ladder and the trim ring being set in subordinate's ladder presses.

2. engine exhaust and brake butterfly valve according to claim 1, is characterized in that: the bottom of described valve body is provided with pressure limiting road, is provided with the pressure limiting device of the pressure of being partial to described air-inlet cavity side for reducing engine exhaust conduit in described pressure limiting road.

3. engine exhaust and brake butterfly valve according to claim 2, it is characterized in that: described pressure limiting device is piston type pressure-limit valve, the bottom of described valve body is also provided with the pore be communicated with described pressure limiting road, and described pore comprises opening and is positioned at the air inlet pore of described air-inlet cavity side and opening is positioned at described exhaust cavity side exhaust pore.

4. engine exhaust and brake butterfly valve according to claim 3, is characterized in that: the opening of described air inlet pore and exhaust pore is all located at the chamber wall of described inner chamber, and described air inlet pore and exhaust pore are the tilted air holes of being partial to described shaft axis.

5. engine exhaust and brake butterfly valve according to claim 4, is characterized in that: described air inlet pore is identical with the angle that exhaust pore is partial to described shaft axis.