CN104088739A - Fuel oil pressure stabilizing valve with built-in filter element - Google Patents

Abstract

The invention relates to a fuel oil pressure stabilizing valve with a built-in filter element. The fuel oil pressure stabilizing valve is characterized in that a lower shell is provided with an accommodating chamber of which the two ends communicate with each other, one end of the accommodating chamber is provided with a pressure balancing device, and the lower shell is hermetically connected to an upper shell to form a sealed accommodating cavity; a filter element is arranged in the accommodating cavity, a pressure relieving device is arranged below the pressure balancing device in the accommodating cavity, one end of the pressure relieving device communicates with a fuel oil inlet pipe while the other end is movably connected to a connecting pipe arranged on the pressure balancing device, and the other end of the connecting pipe communicates with a fuel oil inlet chamber and is connected to a tray after penetrating through the pressure balancing device. The fuel oil pressure stabilizing valve with the built-in filter element has the advantages that the filter element is arranged in the accommodating cavity between the upper and lower shells, and the pressure balancing device and the pressure relieving device are arranged in the lower shell, so that when in use, the pressure balance of fuel oil is achieved, the usage requirement of an automobile fuel injection system on pressure of the fuel oil is ensured, and meanwhile, the fuel oil can be filtered, thus effectively preventing a fuel spray nozzle being influenced by impurities in oil and ensuring working stability of the fuel injection system.

Description

A kind of built-in fuel oil pressure-stabilizing valve of crossing filter core

Technical field

The present invention relates to a kind of fuel oil pressure-stabilizing device, relate in particular a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core, be mainly used in the oil supply system of motor car engine.

Background technique

Existing fuel oil stabilizer mainly plays a fuel pressure balanced action, be to utilize fuel oil stabilizer to regulate the fuel pressure in oil inlet pipe after oil inlet pipe delivered to by fuel oil by fuel pump, in the time that in oil inlet pipe, fuel pressure exceedes setting value, fuel oil stabilizer is automatically opened and is made fuel oil through carrying out release in voltage stabilizer discharge conduit, thereby ensure that the pressure of vehicle fuel pipeline is all the time in setting value, ensure the working stability of automobile fuel injection system, and combustion oil filtration is to be all integrated with separately filter cleaner on fuel oil pump assembly substantially, by filter cleaner, fuel oil is filtered, and because filter cleaner needs to change in use for some time, so just whole fuel oil pump assembly need to be changed, the user cost of vehicle is higher, and because the performance of existing fuel oil stabilizer is single, do not possess fuel oil filtering effect.

Summary of the invention

Single in order to solve existing fuel oil stabilizer performance, do not possess the technical problems such as fuel oil filtering effect, the invention provides a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core, this voltage stabilizer not only possesses fuel pressure equilibrium function, but also can filter the fuel oil that enters motor, realize fuel oil filtering effect, and it is simple in structure, be easy to change, can reduce greatly the user cost of vehicle.

For solving above technical problem, the technological scheme that the present invention takes is a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core, comprises the upper shell and the lower shell body that are provided with oil outlet tube; Described lower shell body is provided with the putting chamber that two ends communicate, and is provided with the tube head with oil drain out and oil inlet pipe in putting chamber one end, the other end be provided with pressure equaliser and lower shell body and upper shell be tightly connected form sealing cavity volume; In cavity volume, be provided with pallet, the external diameter of this pallet is less than the internal diameter of cavity volume, and on pallet, be provided with filter core, and crossed filter core ring-shaped section and ring-shaped and its one end and upper shell interior edge face and fit, the other end and pallet end face fit and make to form relatively independent oil suction chamber and go out oil pocket in cavity volume; Below putting chamber inner-pressure balancing unit, be provided with pressure relief device, this pressure relief device one end is connected with oil inlet pipe, the other end is flexibly connected with the connecting tube being arranged on pressure equaliser, and the connecting tube the other end communicates with oil suction chamber with pallet and is connected with pallet through pressure equaliser; Described oil outlet tube with go out that oil pocket communicates and pressure equaliser is arranged on out in oil pocket and can drive pressure relief device unlatching that fuel oil is discharged through floss hole when the fuel oil overvoltage.

Further, described pressure equaliser includes the diaphragm that is fixed on putting chamber port sealed volume, and described connecting tube one end is connected with pallet and communicates with oil suction chamber through diaphragm, and the other end is placed in putting chamber and is flexibly connected with pressure relief device; Below diaphragm, be provided with balance spring, this balance spring one end compresses mutually with diaphragm, and the other end compresses mutually with the bottom of putting chamber; Described diaphragm can overcome balance spring elastic force in the time of fuel oil overvoltage orders about pressure relief device unlatching.

Further, include diaphragm body at described diaphragm, sealing seat and fixed plate, sealing seat is arranged on the port of lower shell body putting chamber and is tightly connected with lower shell body, on sealing seat, be provided with draw-in groove, diaphragm body surrounding is along being placed in draw-in groove and being tightly connected by fixed plate and sealing seat, on fixed plate, be provided with the first through hole and pressure relief vent, be provided with groove at the first through hole edge, described connecting tube one end is connected with pallet with the first through hole also through diaphragm body and oil suction chamber communicates, in the groove of fixed plate, be provided with the first pad and packing ring, described pallet is placed on packing ring and arranges with fixed plate interval, pressure relief vent is communicated with oil pocket and diaphragm body.

Further, in the both ends of the surface of described diaphragm body, be equipped with respectively the upper and lower reinforcement plate with through hole and be bolted to connection; On described lower reinforcement plate, be provided with release boss, this release boss can be opened pressure relief device in the time of the deformation of diaphragm body.

Further, described pressure relief device includes oil guide pipe, and this oil guide pipe one end is connected with oil inlet pipe, and the other end is placed in connecting tube and external diameter is less than connecting tube internal diameter and connecting tube inwall Spielpassung; Be arranged with release sleeve pipe outward at oil guide pipe, the end of this release sleeve pipe be placed in lower reinforcement plate release boss under and can under the driving of back lash spring, seal the first working position of the connecting tube mouth of pipe and its second working position that oil guide pipe mouth of pipe is communicated to bottom offset by release sleeve pipe with putting chamber of diaphragm ontology-driven in the time of fuel oil overvoltage; Back lash spring one end compresses mutually with release sleeve pipe, and the other end compresses mutually with tube head.

Further, described release sleeve pipe includes sleeve body, be provided with the base of spherical groove in one end of sleeve body, this base can be nested with outside connecting tube under the effect of back lash spring and its upper-end surface be placed in release boss under, in the ball recess of base, be provided with hemisphere plug, this plug is nested with outside oil guide pipe, and there is the first working position that drives base that its and connecting tube mouth of pipe end face are fitted to seal at back lash spring and order about the second working position that the deformation of diaphragm body makes release boss drive base to bottom offset, itself and connecting tube mouth of pipe end face are separated during in fuel oil overvoltage.

Further, be provided with the second pad on the end face of described plug, this second pad fits and seals and be set in suitable mutually, outside oil guide pipe and the outside of oil guide pipe with the end face of connecting tube.

Further, described connecting tube includes tube body and position-limiting tube, tube body is connected with pallet through diaphragm body and circular groove is arranged on tube body outer side wall, the internal diameter that the internal diameter of position-limiting tube is greater than tube body makes formation limited step in position-limiting tube, port at oil guide pipe is provided with limited ring, and the external diameter of this limited ring and position-limiting tube internal diameter match and on limited ring, be at least provided with three oil extraction grooves; On described position-limiting tube outer wall, be provided with annular snap platform, diaphragm body is connected in circular groove and utilizes fixed plate and annular snap platform and connecting tube to be tightly connected.

Further, be provided with the guiding rib suitable with oil guide pipe outer wall on the inwall of described sleeve body, this guiding rib and sleeve body are structure as a whole.

Further, on described plug, be provided with trepanning, be provided with the second guiding rib matching with oil guide pipe outer wall in trepanning, this second guiding rib and plug are structure as a whole.

The invention has the beneficial effects as follows in the cavity volume between upper and lower casing filter core was set, and pressure equaliser and pressure relief device be set in lower shell body, so in use, not only can realize the balance of fuel pressure, ensureing the usage requirement of automobile injection system to fuel pressure, and, also can filter fuel oil, can effectively avoid the impurity in oil product to impact oil nozzle, ensure the working stability of injection system.

Brief description of the drawings

Fig. 1 is the sectional structure chart of a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core of the embodiment of the present invention

Fig. 2 is the three-dimensional structure diagram of lower shell body in the embodiment of the present invention

Fig. 3 is the three-dimensional structure diagram of fixed plate in the embodiment of the present invention

Fig. 4 is the three-dimensional structure diagram of lower reinforcement plate in the embodiment of the present invention

Fig. 5 is the three-dimensional structure diagram of sealing seat in the embodiment of the present invention

Fig. 6 is the three-dimensional structure diagram of connecting tube in the embodiment of the present invention

Fig. 7 is the side perspective structural drawing of connecting tube in the embodiment of the present invention

Fig. 8 is the three-dimensional structure diagram of oil guide pipe in the embodiment of the present invention

Fig. 9 is the three-dimensional structure diagram of plug in the embodiment of the present invention

Figure 10 is the three-dimensional structure diagram of release sleeve pipe in the embodiment of the present invention

Figure 11 is the side perspective structural drawing of release sleeve pipe in the embodiment of the present invention

Figure 12 is the three-dimensional structure diagram of tube head in the embodiment of the present invention

Figure 13 is the three-dimensional structure diagram of a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core of the embodiment of the present invention

In figure: 1. upper shell, 11. oil outlet tubes, 2. lower shell body, 21. putting chambers, 22. tube heads, 221. oil drain out, 222. oil inlet pipe, 3. pressure equaliser, 31. diaphragms, 311. diaphragm bodies, 312. sealing seat, 3121. draw-in groove, 313. fixed plate, 3131. the first through hole, 3132. pressure relief vent, 3133 grooves, 3134. the first pad, 3135. packing ring, 32. balance springs, reinforcement plate on 33., 34. times reinforcement plates, 341. release boss, 4. cavity volume, 41. oil suction chambers, 42. go out oil pocket, 5. pallet, 6. cross filter core, 7. pressure relief device, 71. oil guide pipes, 711. limited ring, 712. oil extraction grooves, 72. release sleeve pipes, 721, sleeve body, 7211. guiding rib, 722. base, 7221. ball recess, 723. plug, 7231. trepanning, 7232. the second guiding rib, 724. second pads, 73. back lash springs, 8. connecting tube, 81. tube bodies, 811. circular groove, 82. position-limiting tubes, 821. limited step, 822. annular snap platforms

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present invention is described further:

As shown in Fig. 1-13, the present invention is a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core, comprises the upper shell 1 and the lower shell body 2 that are provided with oil outlet tube 11; Described lower shell body 2 is provided with the putting chamber 21 that two ends communicate, and is provided with the tube head 22 with oil drain out 221 and oil inlet pipe 222 in putting chamber 21 one end, and the other end is provided with pressure equaliser 3 and lower shell body 2 is tightly connected and forms sealing cavity volume 4 with upper shell 1; In cavity volume 4, be provided with pallet 5, the external diameter of this pallet 5 is less than the internal diameter of cavity volume 4, and on pallet 5, be provided with filter core 6, cross filter core 6 ring-shaped section and ring-shaped and its one end and upper shell 1 interior edge face fits, the other end and pallet 5 end faces fit and make the relatively independent oil suction chamber of the interior formation of cavity volume 4 41 and go out oil pocket 42; Below putting chamber 21 inner-pressure balancing units 3, be provided with pressure relief device 7, these pressure relief device 7 one end are connected with oil inlet pipe 222, the other end is flexibly connected with the connecting tube 8 being arranged on pressure equaliser 3, and connecting tube 8 the other ends communicate with oil suction chamber 41 with pallet 5 and are connected with pallet 5 through pressure equaliser 3; Described oil outlet tube 11 with go out that oil pocket 42 communicates and pressure equaliser 3 is arranged on out in oil pocket 42 and can drive pressure relief device 7 unlatchings that fuel oil is discharged through floss hole 221 when the fuel oil overvoltage.In cavity volume 4, add pallet 5, and (crossing filter core is filter paper to utilize pallet 5 and annular filter core 6, for existing conventional products, the present embodiment is not further qualified) cavity volume 4 is divided into two and forms two relatively independent oil suction chambers 41 and go out oil pocket 42, so just can ensure in automobile oil spout pipeline all the time under the pressure in setting, be convenient to automobile and possess enough fuel pressures after flame-out and start automobile, and in the time of fuel pressure overvoltage in oil spout pipeline, go out fuel oil in oil pocket 42 just can strut pressure equaliser 3 and drive it to open pressure relief device 7 release of draining the oil, if and pallet 5 is not set, cavity volume 4 can not be divided into two relatively independent oil suction chambers 41 and go out oil pocket 42, in the time that the fuel pressure in oil suction chamber 41 is excessive, (be subject to the obstruct of filter core 6 like this, now the most of also filtered core 6 of fuel oil enters out in oil pocket 42, going out fuel oil in oil pocket 42 does not also reach fuel pressure and requires), can directly strut pressure equaliser 3, the pressure relief device 7 that causes fuel pressure in oil spout pipeline just not start when overvoltage is drained the oil, thereby affect the service behaviour of injection system, therefore, in cavity volume 4, add pallet 5, it is the necessary means that ensures fuel pressure requirement.In putting chamber 21 ports of lower shell body 2, pressure equaliser 3 being set makes, lower shell body 1, between 2, form sealed volume 4, and in cavity volume 4, add pallet 5 and annular filter core 6 is installed on pallet 5, so just can make two relatively independent oil suction chambers 41 of the interior formation of cavity volume 4 and go out oil pocket 42, fuel oil through fuel pump deliver to oil suction chamber 41 interior after, filtration through filter core 6 enters out oil pocket 42, and then give injection system fuel feeding through oil outlet tube 41, the present invention just can realize combustion oil filtration like this, avoid the impurity in oil product to result in blockage to oil nozzle, ensure the working stability of injection system, if and the fuel oil of working as oil pocket 42 is too much, while causing oil spout pipeline internal combustion oil pressure excessive, fuel oil just can be out of shape by driving pressure Equilibrator 3, make it drive pressure relief device 7 to open, fuel oil is in the time that oil inlet pipe 222 enters oil suction chamber 41 like this, can the fuel oil of overvoltage be discharged in putting chamber 21 through pressure relief device 7, be back in automotive oil tank finally by oil drain out 221, realize the balance of fuel pressure, adopt this structure, not only can realize the automatic adjusting of fuel pressure, ensure the usage requirement of automobile injection system to fuel pressure, and, also can filter fuel oil, can effectively avoid the impurity in oil product to impact oil nozzle, ensure the working stability of injection system.

In the present embodiment, in order to ensure the fuel pressure in oil spout pipeline, described pressure equaliser 3 includes the diaphragm 31 that is fixed on putting chamber 21 ports sealed volume 4, described connecting tube 8 one end are connected with pallet 5 and communicate with oil suction chamber 41 through diaphragm 31, and the other end is placed in putting chamber 21 and is flexibly connected with pressure relief device 7, below diaphragm 31, be provided with balance spring 32, these balance spring 32 one end compress mutually with diaphragm 31, and the other end compresses mutually with the bottom of putting chamber 21, described diaphragm 31 can overcome balance spring 32 elastic force in the time of fuel oil overvoltage to be ordered about pressure relief device 7 and opens, putting chamber 21 ports at lower shell body 2 arrange diaphragm 31, and utilize diaphragm 31 to seal putting chamber 21 ports of lower shell body 2, thereby make, lower shell body 1, between 2, form sealed volume 4, like this when fuel oil is after connecting tube 8 enters oil suction chamber 41, enter out oil pocket 42 through the filtration of filter core 6 again, if in the time going out the fuel pressure of oil pocket 42 and exceed setting value, the elastic force that fuel oil just can drive diaphragm 31 to overcome balance spring 32 makes diaphragm 31 be bent downwardly distortion, thereby back down pressure relief device 7, make the fuel oil that enters oil suction chamber 41 and go out in oil pocket 42 oppositely get back in oil suction chamber 41 and emit through pressure relief device 7 through filter core 6, ensure out that oil pocket 42 and oil spout pipeline internal combustion oil pressure are all the time in setting value, and when fuel oil is after pressure relief device 7 emits, when going out fuel pressure in oil pocket 42 and oil spout pipeline and reaching in setting value, the pressure that diaphragm 31 bears will correspondingly reduce, now, balance spring 32 will push up presses diaphragm 31 to reset, pressure relief device 7 cuts out, thereby ensure the balance of fuel pressure, certainly, from fuel oil pressure-stabilizing angle, also can not adopt diaphragm 31 structures, such as piston being set in the port of lower shell body 2 putting chambers 21, utilize balance spring 32 that piston is blocked in to putting chamber 21 ports, can reach equally identical object, but adopt piston structure can cause moment that the Pressure Drop going out in oil pocket and oil spout pipeline is caused below setting value, affect the working stability of injection system, therefore, the present embodiment is preferred implementation.

In the present embodiment, in order to ensure the pressure of fuel oil and to be convenient to the installation of diaphragm 31, described diaphragm 31 includes diaphragm body 311, sealing seat 312 and fixed plate 313, sealing seat 312 is arranged on the port of lower shell body 2 putting chambers 21 and is tightly connected with lower shell body 2, on sealing seat 312, be provided with draw-in groove 3121, diaphragm body 311 surroundings are tightly connected along being placed in draw-in groove 3121 and by fixed plate 313 and sealing seat 312, on fixed plate 313, be provided with the first through hole 3131 and pressure relief vent 3132, be provided with groove 3133 at the first through hole 3131 edges, described connecting tube 8 one end are connected with pallet 5 with the first through hole 3131 also through diaphragm body 311 and oil suction chamber 41 communicates, in the groove 3133 of fixed plate 313, be provided with the first pad 3134 and packing ring 3135, described pallet 5 is placed on packing ring 3135 and arranges with fixed plate 313 intervals, pressure relief vent 3132 is communicated with oil pocket 42 and diaphragm body 311, by sealing seat 312 and fixed plate 313 are set, and utilize fixed plate 313 that diaphragm body 311 is fixed in sealing seat 312, be convenient to like this production and the installation of diaphragm 31, first diaphragm body 311 is placed in when mounted in the draw-in groove 3121 of sealing seat 312, fixed plate 313 being snapped in draw-in groove 3121 fixes diaphragm body 311 and sealing seat 312 again, the cross section of the cross section of sealing seat 312 and putting chamber 21 ports matches, and then putting chamber 21 ports that sealing seat 312 are placed on to lower shell body 2 make putting chamber 21 sealings, lower shell body 1, between 2, form the cavity volume 4 of sealing, certainly, from the requirement using, also can directly by bolt or clasp, itself and lower shell body 2 be fixed diaphragm body 311, can realize equally identical function, reach identical object, but adopt this structure, can greatly facilitate production and processing and installation, therefore, the mode of execution of the present embodiment is preferred implementation, and the first through hole 3131 is set on fixed plate 313, be to be mainly convenient to connecting tube 8 enter in oil suction chamber 41 with the fuel oil easy to connect of pallet 5, and groove 3133 is set, and in groove 3133, add the first pad 3134 and packing ring 3135, pallet 5 just can arrange with fixed plate 313 intervals like this, while using the fuel oil overvoltage in oil pocket 42, can go 311 bending deflections of presses against diaphragm sheet body by pressure relief vent 3132, thereby drive pressure relief device 7 to open and carry out fuel emission release, ensure the stability of oil spout pipeline internal combustion oil pressure, improved the working stability of injection system, and in order to install at the interval that ensures pallet 5 and fixed plate 313, multiple fixed supports also can be set on fixed plate 313, fixing pallet and the fixed plate interval of can making arranges, but adopt this structure, can also utilize the fuel pressure in oil suction chamber 41 to carry out reverse extrusion pallet 5, the transfer function that makes pallet 5 play a power pushes fixed plate 313, makes the junction point of diaphragm body 311 and connecting tube 8 and diaphragm body 311 more firm with the junction point sealing of draw-in groove 3121, ensures sealability.

In the present embodiment, can drive when the compressive deformation pressure relief device 7 to open for the ease of diaphragm body 311 and carry out fuel oil release discharge, in the both ends of the surface of described diaphragm body 311, be equipped with respectively the upper and lower reinforcement plate 33,34 with through hole and be bolted to connection; On described lower reinforcement plate 34, be provided with release boss 341, this release boss 341 can push up in the time of 311 deformation of diaphragm body presses pressure relief device 7, and balance spring 32 one end compress mutually with lower reinforcement plate 34; By upper and lower reinforcement plate 33,34 is set in the both ends of the surface up and down of diaphragm body 311 simultaneously, and on lower reinforcement plate 34, release boss 341 is set, like this when go out in oil pocket 42 fuel oil overvoltage time, fuel oil enters pressure relief vent 3132 presses against diaphragm sheet bodies 311 makes it be bent downwardly distortion, now, release boss 341 just can order about pressure relief device 7 and open, make in connecting tube 8 and go out the interior fuel oil reverse reflux of oil pocket 42 to be discharged to through pressure relief device 7 to oil suction chamber 41 is interior that putting chamber 21 is interior discharges through oil drain out 221, realize the pressure balance of fuel oil; Lower reinforcement plate 34 also can be only set certainly, lower reinforcement plate 34 is fixedly connected with diaphragm body 311, also can realize diaphragm body 311 and drive the function of pressure relief device 7, but because diaphragm 31 is made for elastic material, be unfavorable for the fixed installation of lower reinforcement plate 34, therefore, in the both ends of the surface up and down of diaphragm body 311, add upper and lower reinforcement plate 33,34, the convenient lower preferred implementation that is installed as of reinforcing stator 34 simultaneously.

In the present embodiment, for the ease of carrying out release when the fuel oil overvoltage, ensure the stability of fuel pressure, described pressure relief device 7 includes oil guide pipe 71, these oil guide pipe 71 one end are connected with oil inlet pipe 222, and the other end is placed in connecting tube 8 and external diameter is less than connecting tube 8 internal diameters and connecting tube 8 inwall Spielpassung, outside oil guide pipe 71, be arranged with release sleeve pipe 72, the end of this release sleeve pipe 72 be placed in lower reinforcement plate 34 release boss 341 under and can under the driving of back lash spring 73, seal the first working position of connecting tube 8 mouths of pipe and in the time of fuel oil overvoltage diaphragm body 311 drive its second working positions that oil guide pipe 71 mouths of pipe communicated to bottom offset by release sleeve pipe 72 with putting chamber 21, back lash spring 73 one end compress mutually with release sleeve pipe 72, and the other end compresses mutually with tube head 22, between oil inlet pipe 222 and connecting tube 8, oil guide pipe 71 is set, and oil guide pipe 71 one end are connected with oil inlet pipe 222, the other end insert make in connecting tube 8 its with connecting tube 8 between formation unload oil-gap, and be that while preventing that fuel pressure from not reaching setting value, fuel oil leaks through the junction point of connecting tube 8 and oil guide pipe 71, outside oil guide pipe 71, being provided with can be along oil guide pipe slippage be sealed and matched with oil guide pipe 71 and (be sealed and matched and refer to that forming motive sealing between release sleeve pipe 72 and oil guide pipe 71 outsides is connected Shang Xia 71, the motive sealing of pipeline is prior art, at this, be not described in detail) release sleeve pipe 72, then utilize the elastic force of back lash spring 73 to order about the mouth of pipe of release sleeve pipe 72 displacement shutoff connecting tubes 8, realize the fuel sealing (this state is the first working position) of connecting tube 8, ensure the usage requirement of fuel pressure and the demand of fuel oil, if and in the time of fuel pressure overvoltage, fuel oil in oil suction chamber 42 will enter the interior presses against diaphragm sheet of pressure relief vent 3132 body 311, make diaphragm body 311 and lower reinforcement plate 34 synchronously to bottom offset, now, release boss 341 just can push up presses the end of release sleeve pipe 72 to make its elastic force that overcomes back lash spring 73 to bottom offset (this state is the second working position), the fuel oil of overvoltage just can the interstitial row between oil guide pipe 71 and connecting tube 8 be put in putting chamber 21 like this, be back in fuel tank through oil drain out 221 again, realize the Automatic Balance Regulation of fuel pressure, certainly, from usage requirement, also can not adopt this structure, such as directly on the sidewall of connecting tube 8, oil drainage hole is set, utilize release sleeve pipe 72 to coordinate with the outer side wall motive sealing of connecting tube 8, the release boss 341 that is fixed on the lower reinforcement plate 34 of diaphragm body 311 belows in the time of fuel oil overvoltage drives release sleeve pipe 72 to bottom offset, oil drainage hole to be communicated with putting chamber 21, the just directly discharge of the oil drainage hole from connecting tube 8 outer side walls of fuel oil like this, ensure the balance of fuel pressure, but because this sealing structure is unstable, therefore, adopting the mode of execution of the present embodiment is preferred implementation.

In the present embodiment, for the ease of the gap between release and shutoff connecting tube 8 and the oil guide pipe 71 of fuel oil, described release sleeve pipe 72 includes sleeve body 721, be provided with the base 722 of spherical groove 7221 in one end of sleeve body 721, this base 722 can be nested with outside connecting tube 8 under the effect of back lash spring 73 and its upper-end surface be placed in release boss 341 under, in the ball recess 7221 of base 722, be provided with hemisphere plug 723, this plug 723 is nested with outside oil guide pipe 71, and having at back lash spring 73 drives base 722 to make fit the first working position of sealing and order about the second working position that 311 deformation of diaphragm body make release boss 341 drive base 722 to bottom offset, itself and connecting tube 8 mouth of pipe end faces to be separated during in fuel oil overvoltage of itself and connecting tube 8 mouth of pipe end faces, release sleeve pipe 72 is made as to sleeve body 721 and base 722 two-part, in using process, utilizes base 722 to match with lower reinforcement plate 34 release boss 341, be convenient to like this diaphragm body 311 and in the time that bend by pressure is out of shape, open pressure relief device 7, and at the interior hemisphere plug 723 that arranges of ball recess 7221, that utilizes that back lash spring 73 drives that base 722 makes that the mouth of pipe end face of itself and connecting tube 8 fits sealed joint pipe 8 and oil guide pipe 71 junction points unloads oil-gap (the first working position that this state is plug), ensure the pressure stability of fuel oil and the quantity delivered of fuel oil, improve the working stability of injection system, and in the time of fuel pressure overvoltage, fuel oil presses against diaphragm sheet body 311 is bent downwardly release boss 341 that distortion utilizes lower reinforcement plate 34 and drives elastic force that base 722 overcomes back lash spring 73 to bottom offset, now, plug 723 loses the support of base 722, fuel oil in connecting tube 8 just can back down plug 723 is back in fuel tank the emptying gap discharge base 722 outer oil drain out 221 through tube head 22 on of fuel oil between connecting tube 8 and oil guide pipe 71, realizes the Automatic Balance Regulation of fuel pressure.

In the present embodiment, in order to prevent that fuel oil from leaking through the junction point of connecting tube 8 and oil guide pipe 71, on the end face of described plug 723, be provided with the second pad 724, this second pad 724 fits and seals and be set in suitable mutually, outside the oil guide pipe 71 and outside of oil guide pipe 71 with the end face of connecting tube 8; On plug 723, add the second pad 724, and utilize the second pad 724 and the mouth of pipe end face of connecting tube 8 to fit, so just can prevent that the junction point of connecting tube 8 and oil guide pipe 71 from leaking, affect the pressure stability of fuel oil; Secondly, the second pad 724 is nested with oil guide pipe 71 outside and makes it and fit to form with oil guide pipe 71 outer walls and seal, so just can prevent fuel leakage, the pressure stability of guarantee fuel oil; In the time of fuel pressure overvoltage, 311 bending deflections of diaphragm body are ordered about elastic force that lower fixed plate 34 top pressure pipe seats 722 overcome back lash spring 73 to bottom offset, now, fuel oil in connecting tube 8 just can drive the second pad 724 along oil guide pipe 71 to bottom offset, fuel oil just can be discharged through the junction point of connecting tube 8 and oil guide pipe 71 like this, realizes the Automatic Balance Regulation of fuel oil; And when fuel pressure is during lower than setting pressure, back lash spring 73 just can top pressure pipe seat 722 to top offset, base 722 just can drive plug 723 and the second pad 724 to stop up the mouth of pipe end face of connecting tube 8, realizes the sealing of connecting tube 8.

In the present embodiment, for ease of the sealability of connecting tube 8 and diaphragm body 311 junction points, described connecting tube 8 includes tube body 81 and position-limiting tube 82, tube body 81 is connected with pallet 5 through diaphragm body 311 and circular groove 811 is arranged on tube body 81 outer side walls, the internal diameter that the internal diameter of position-limiting tube 82 is greater than tube body 81 makes the interior formation limited step 821 of position-limiting tube 82, be provided with limited ring 711 in the port of oil guide pipe 71, the external diameter of this limited ring 711 and position-limiting tube 82 internal diameters match and on limited ring 711, are at least provided with three oil extraction grooves 712; On described position-limiting tube 82 outer walls, be provided with annular snap platform 822, diaphragm body 311 is connected in circular groove 811 and utilizes fixed plate 313 and annular snap platform 822 is tightly connected with connecting tube 8; On the outer side wall of tube body 81, be provided with circular groove 811, in the time that tube body 81 passes diaphragm body 311, the edge, hole at diaphragm body 311 centers just can snap in circular groove 811, ensures the degree of being connected firmly of tube body 81 and diaphragm body 311; And annular snap platform 822 is set on position-limiting tube 82, and make diaphragm body 311 between annular snap platform 822 and fixed plate 313, in running, fuel oil in oil suction chamber 41 just can oppositely apply certain pressure to pallet 5, and pallet 5 just can pass to extruding force fixed plate 313, make fixed plate 313 and annular snap platform 822 presses against diaphragm sheet bodies 311, ensure the installation fastness of diaphragm body 311; And the internal diameter that the internal diameter of position-limiting tube 82 is arranged to be greater than tube body 81 is made to the interior formation limited step 821 of position-limiting tube 82, just can form spacing cooperation with the port limited ring 711 that is arranged on oil guide pipe 71 like this, can effectively prevent from impacting oil guide pipe 71 and cause oil guide pipe 71 mounting points that over-travel sealing orifice occurs in the time that back lash spring 73 resets, affect the pressure relief performance of fuel pressure overvoltage; And the limited ring 711 matching with position-limiting tube 82 internal diameters is set on oil guide pipe 71, and oil extraction groove 712 is set on limited ring 711, after release sleeve pipe 72 is backed down by the release boss 341 of lower reinforcement plate 34, fuel oil just can be discharged in putting chamber 21 through oil extraction groove 712, is then back in fuel tank through oil drain out 221.

In the present embodiment, on the inwall of described sleeve body 721, be provided with the guiding rib 7211 suitable with oil guide pipe 71 outer walls, this guiding rib 7211 is structure as a whole with sleeve body 721, add guiding rib 7211, can be convenient to sleeve body 721 along oil guide pipe 71 axially to bottom offset, avoid, swinging, affecting the sealability of release sleeve pipe 72 sealed joint pipes 8 in bottom offset process.

In the present embodiment, be provided with trepanning 7231 on described plug 723, be provided with the second guiding rib 7232 matching with oil guide pipe 71 outer walls in trepanning 7231, this second guiding rib 7232 is structure as a whole with plug 723; Add the second guiding rib 7232 and be also in order to ensure that plug 723 can, along oil guide pipe 71 displacement vertically downward, avoid it to swing when to bottom offset, affect sealability and the reset of connecting tube 8 mouths of pipe.

Working method of the present invention is: fuel pump is connected with oil inlet pipe 222, oil outlet tube 11 is connected with injection system pipeline, start fuel pump, fuel oil is through oil inlet pipe 222, oil guide pipe 71, connecting tube 8 enters in oil suction chamber 41, through the filtration (realizing fuel oil filtering function of the present invention) of filter core 6, fuel oil enters out in oil pocket 42 and through oil outlet tube 11 to injection system fuel feeding, because the fuel delivery amount of fuel pump is greater than the fuel consumption of injection system, after operation a period of time, oil suction chamber 41 and the fuel pressure going out in oil pocket 42 will exceed setting value, now, go out fuel oil in oil pocket 42 through pressure relief vent 3132 presses against diaphragm sheet bodies 311 and overcome the elastic force of balance spring 32, make diaphragm body 311 be bent downwardly distortion, simultaneously, the lower reinforcement plate 34 that is arranged on diaphragm body 311 belows synchronously presses release sleeve pipe 72 to make elastic force that release sleeve pipe 72 overcomes back lash spring 73 to bottom offset to bottom offset top, now, plug 723 loses support force, synchronously along oil guide pipe 71 down slidings, and just can backing down the second pad 724, fuel oil in oil guide pipe 71 and connecting tube 8 make the second pad 724 along oil guide pipe 71 to bottom offset, like this, the fuel oil going out in oil pocket 42 and oil suction chamber 41 will be discharged in putting chamber 21 through oil extraction groove 712 to connecting tube 8 places by reverse reflux, and then be back in fuel tank by the oil drain out 221 on tube head 22, realize the Automatic Balance Regulation (realizing fuel pressure automatic regulation function of the present invention) of fuel pressure, and in the time going out fuel pressure in oil pocket 42 lower than setting value, the extruding force that diaphragm body 311 bears will be less than the elastic force of balance spring 32, balance spring 32 will drive lower reinforcing stator 34 and diaphragm body 311 to reset like this, now, release sleeve pipe 72 loses downward pressure on top surface, back lash spring 73 will drive release sleeve pipe 72 to reset, and utilizes plug 723 and second pad 724 shutoff connecting tube 8 mouths of pipe just can stop after fuel emission makes fuel oil enter oil suction chamber 41 and arrives fuel-displaced chamber 42 to injection system fuel feeding through filtering, in the time going out oil pocket 42 pressure and again exceed setting value, repeat above step and realize fuel pressure Automatic Balance Regulation.

Above-described embodiment should not be considered as limitation of the present invention, but any improvement of doing based on spirit of the present invention, all should be within protection scope of the present invention.

Claims (10)

1. a built-in fuel oil pressure-stabilizing valve of crossing filter core, comprises the upper shell and the lower shell body that are provided with oil outlet tube; It is characterized in that described lower shell body is provided with the putting chamber that two ends communicate, be provided with the tube head with oil drain out and oil inlet pipe in putting chamber one end, the other end is provided with pressure equaliser and lower shell body and upper shell and is tightly connected to form and seals cavity volume; In cavity volume, be provided with pallet, the external diameter of this pallet is less than the internal diameter of cavity volume, and on pallet, be provided with filter core, and crossed filter core ring-shaped section and ring-shaped and its one end and upper shell interior edge face and fit, the other end and pallet end face fit and make to form relatively independent oil suction chamber and go out oil pocket in cavity volume; Below putting chamber inner-pressure balancing unit, be provided with pressure relief device, this pressure relief device one end is connected with oil inlet pipe, the other end is flexibly connected with the connecting tube being arranged on pressure equaliser, and the connecting tube the other end communicates with oil suction chamber with pallet and is connected with pallet through pressure equaliser; Described oil outlet tube with go out that oil pocket communicates and pressure equaliser is arranged on out in oil pocket and can drive pressure relief device unlatching that fuel oil is discharged through floss hole when the fuel oil overvoltage.

2. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 1, it is characterized in that described pressure equaliser includes the diaphragm that is fixed on putting chamber port sealed volume, described connecting tube one end is connected with pallet and communicates with oil suction chamber through diaphragm, and the other end is placed in putting chamber and is flexibly connected with pressure relief device; Below diaphragm, be provided with balance spring, this balance spring one end compresses mutually with diaphragm, and the other end compresses mutually with the bottom of putting chamber; Described diaphragm can overcome balance spring elastic force in the time of fuel oil overvoltage orders about pressure relief device unlatching.

3. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 2, it is characterized in that including diaphragm body at described diaphragm, sealing seat and fixed plate, sealing seat is arranged on the port of lower shell body putting chamber and is tightly connected with lower shell body, on sealing seat, be provided with draw-in groove, diaphragm body surrounding is along being placed in draw-in groove and being tightly connected by fixed plate and sealing seat, on fixed plate, be provided with the first through hole and pressure relief vent, be provided with groove at the first through hole edge, described connecting tube one end is connected with pallet with the first through hole also through diaphragm body and oil suction chamber communicates, in the groove of fixed plate, be provided with the first pad and packing ring, described pallet is placed on packing ring and arranges with fixed plate interval, pressure relief vent is communicated with oil pocket and diaphragm body.

4. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 3, is characterized in that in the both ends of the surface of described diaphragm body, being equipped with respectively the upper and lower reinforcement plate with through hole and being bolted to connection; On described lower reinforcement plate, be provided with release boss, this release boss can be opened pressure relief device in the time of the deformation of diaphragm body.

5. according to a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core described in any one in claim 1-4, it is characterized in that described pressure relief device includes oil guide pipe, this oil guide pipe one end is connected with oil inlet pipe, and the other end is placed in connecting tube and external diameter is less than connecting tube internal diameter and connecting tube inwall Spielpassung; Be arranged with release sleeve pipe outward at oil guide pipe, the end of this release sleeve pipe be placed in lower reinforcement plate release boss under and can under the driving of back lash spring, seal the first working position of the connecting tube mouth of pipe and its second working position that oil guide pipe mouth of pipe is communicated to bottom offset by release sleeve pipe with putting chamber of diaphragm ontology-driven in the time of fuel oil overvoltage; Back lash spring one end compresses mutually with release sleeve pipe, and the other end compresses mutually with tube head.

6. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 5, it is characterized in that described release sleeve pipe includes sleeve body, be provided with the base of spherical groove in one end of sleeve body, this base can be nested with outside connecting tube under the effect of back lash spring and its upper-end surface be placed in release boss under, in the ball recess of base, be provided with hemisphere plug, this plug is nested with outside oil guide pipe, and there is the first working position that drives base that its and connecting tube mouth of pipe end face are fitted to seal at back lash spring and order about the second working position that the deformation of diaphragm body makes release boss drive base to bottom offset, itself and connecting tube mouth of pipe end face are separated during in fuel oil overvoltage.

7. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 6, it is characterized in that being provided with the second pad on the end face of described plug, this second pad fits and seals and be set in suitable mutually, outside oil guide pipe and the outside of oil guide pipe with the end face of connecting tube.

8. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 7, it is characterized in that described connecting tube includes tube body and position-limiting tube, tube body is connected with pallet through diaphragm body and circular groove is arranged on tube body outer side wall, the internal diameter that the internal diameter of position-limiting tube is greater than tube body makes formation limited step in position-limiting tube, port at oil guide pipe is provided with limited ring, and the external diameter of this limited ring and position-limiting tube internal diameter match and on limited ring, be at least provided with three oil extraction grooves; On described position-limiting tube outer wall, be provided with annular snap platform, diaphragm body is connected in circular groove and utilizes fixed plate and annular snap platform and connecting tube to be tightly connected.

9. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 8, is characterized in that on the inwall of described sleeve body, being provided with the guiding rib suitable with oil guide pipe outer wall, and this guiding rib and sleeve body are structure as a whole.

10. a kind of built-in fuel oil pressure-stabilizing valve of crossing filter core according to claim 9, is characterized in that being provided with trepanning on described plug, is provided with the second guiding rib matching with oil guide pipe outer wall in trepanning, and this second guiding rib and plug are structure as a whole.