CN217653334U - Quick response electromagnetic valve for fuel cell system - Google Patents

Abstract

The utility model relates to a quick response solenoid valve for fuel cell system, including the sliding sleeve in the solenoid valve, set up in the sliding sleeve and along sliding sleeve endwise slip armature, set up and be used for limiting the dog of armature slip stroke in the sliding sleeve opening part, be equipped with the variable cross section runner structure in intercommunication armature both ends and sliding sleeve tip space between armature and the sliding sleeve, the variable cross section runner structure slides to the earlier grow of the runner section of variable cross section runner structure in stroke terminal point process at armature and reduces gradually again. The utility model discloses utilize the variable cross section runner structure in the solenoid valve to make armature move the damping system that the area changes along with the valve stroke change at the operation in-process. The change of the fluid flow area brings the change of the fluid flow damping, and finally the aim of controlling the motion damping of the valve body and the armature is achieved, so that the problems of improving the responsiveness and leakage, improving the collision between the valve body and the valve seat and between the armature and the sliding sleeve and improving the reliability of the system are solved.

Description

Quick response electromagnetic valve for fuel cell system

Technical Field

The utility model relates to a solenoid valve technical field, in particular to a quick response solenoid valve for fuel cell system.

Background

With the development of the world economy, energy and environmental issues are becoming the focus of attention of all countries, and are also becoming the hot spots of technical research in the field of power systems. The main economic proposals worldwide all put forward carbon peak-reaching and carbon neutralization schedules, and also put forward more urgent needs for the development of low-carbon of energy and power systems.

The fuel cell technology is a clean and efficient power device, generates electric energy through chemical reaction of hydrogen and oxygen, is used for various fields of production and life, only produces water as a byproduct, and is a clean technology.

However, the fuel cell technology is not widely used at present, mainly because of the fact that many technical difficulties exist in the fuel cell technology, which cannot be completely broken through, and the production and manufacturing costs are high. The control of the hydrogen and air circulation system is one of them. At present, the on-off and flow of a pipeline are mainly controlled by using an electromagnetic valve. Efficient operation of the fuel cell system requires rapid and accurate response of the solenoid valve, and therefore, increasing the response speed of the solenoid valve is critical to improving the performance of the entire fuel cell system.

The switch type solenoid valve, one of the most commonly used electromagnetic actuators, has a response closely related to the internal armature sliding sleeve assembly structure.

The existing electromagnetic valve has the following defects:

in most of the current on-off solenoid valves, if the leakage amount is to be reduced, the most important means is to increase the electromagnetic force driving force for closing the valve, in addition to improving the fit relationship between the valve body and the valve seat. However, the increase in the electromagnetic driving force causes an increase in the impact collision of the valve body with the valve seat when the valve is closed. The long-term collision of valve body and disk seat can cause valve body and disk seat wearing and tearing even fracture, finally leads to letting out leakage quantity to increase, even the valve body can't be sealed completely with the disk seat, finally inefficacy.

On the other hand, in order to improve the valve closing response performance, it is also necessary to increase the electromagnetic driving force, which also adversely affects the valve reliability.

In addition, in order to improve the response performance of the valve opening, the return spring force needs to be improved, and the pretightening force or the rigidity of the return spring is increased. When the valve is completely opened due to the increase of the return spring force, the collision between the armature and the rear end of the sliding sleeve is aggravated, and the armature and the sliding sleeve are abraded and even cracked and failed due to long-term collision. After the return spring force is increased, in order to ensure sufficient electromagnetic driving force, the current needs to be increased, and the energy consumption of the valve is overhigh.

As can be seen, in general, it is necessary to improve the response and sealing performance (reduce leakage) of the valve and to improve the return spring force and the electromagnetic driving force. However, the increase of the return spring force and the electromagnetic driving force can lead to the increase of the movement speed of the valve, so that the collision of parts is aggravated, the reliability is reduced, and the energy consumption is overhigh.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, it is an object of the present invention to provide a fast response solenoid valve for a fuel cell system.

The utility model provides a technical scheme that its technical problem adopted is: a quick response electromagnetic valve for a fuel cell system comprises a sliding sleeve in the electromagnetic valve, a coil arranged outside the sliding sleeve, an armature arranged in the sliding sleeve and sliding axially along the sliding sleeve, a stop block arranged at the opening of the sliding sleeve and used for limiting the sliding stroke of the armature, a valve block arranged at the opening of the sliding sleeve, a valve body arranged in the valve block, a push rod connected with the valve body and the armature, and a return spring arranged at the head of the valve block and used for resetting the valve body, wherein a liquid inlet hole is formed in the front end of the valve block; the variable cross-section runner structure is characterized in that a variable cross-section runner structure communicated with a gap between the two ends of the armature and the end part of the sliding sleeve is arranged between the armature and the sliding sleeve, and the runner cross section of the variable cross-section runner structure is gradually reduced when the armature slides to the stroke end.

The design adopts a variable-section flow passage structure, so that the flow area of the armature changes along with the change of the valve stroke during operation. The change of the fluid flow area brings the change of the fluid flow damping, and finally the aim of controlling the motion damping of the valve body and the armature is achieved, so that the problems of improving the responsiveness and leakage, improving the collision between the valve body and the valve seat and between the armature and the sliding sleeve, reducing the vibration, only influencing the resistance in the motion process, not influencing the final binding force of closing the seated valve body and the valve seat, and not influencing the return driving force in the valve opening process are solved. The system damping is increased only when the valve is seated and at the opening end point, and then the resistance can disappear quickly, so that the valve has higher closing holding force, and the leakage rate after the valve is closed is reduced. In addition, the rigidity of the return spring can be properly improved, so that the responsiveness of the system is improved, and the reliability of the system is improved.

As a further improvement of the design, the variable cross-section flow channel structure in the electromagnetic valve comprises a hollow plunger rod arranged at the head of the armature and with a closed head, a boss arranged on the inner wall of the tail end of the sliding sleeve, and an avoidance notch arranged at the tail end of the armature and convenient for the insertion of the boss, wherein the plunger rod is provided with a backflow hole penetrating through the side wall of the plunger rod, the armature is provided with a main flow channel penetrating through the armature from front to back, the tail end of the plunger rod is communicated with the main flow channel, the stopper is provided with a sliding hole convenient for the plunger rod to penetrate through, the outer diameter of the plunger rod is in clearance fit with the inner diameter of the sliding hole, the outer diameter of the head of the boss is smaller than the outer diameter of the tail end, the outer diameter of the front end of the avoidance notch is smaller than the outer diameter of the tail end, namely, the armature slides to the tail end of the sliding sleeve, the armature is located at the front stroke end point, and the side face of the plunger rod is completely located in the sliding hole of the sliding sleeve or at the front end of the stopper. The variable cross-section flow channel structure adopts the hollow plunger to be provided with the backflow hole, realizes the control of the flow cross section between the armature and the end part of the sliding sleeve by utilizing the lug boss and the avoiding notch, has simple structure and reduces the replacement cost.

As a further improvement of the design, the variable cross-section flow channel structure comprises an outer diversion trench which is arranged on the inner wall of the sliding sleeve and extends along a generatrix of the inner wall of the sliding sleeve, the head of the armature is provided with a plunger rod connected with the push rod, the stop block is provided with a slide hole matched with the plunger rod, the length of the outer diversion trench is smaller than the total stroke of the armature sliding forwards and backwards, the front end of the outer diversion trench is positioned behind the stroke end point of the front end of the armature, namely the armature slides to the stroke end point of the front end, the front end of the armature is positioned on the front side of the outer diversion trench, and the front end of the outer diversion trench is closed; the rear end of the outer diversion trench is located on the front side of the stroke end of the rear end of the armature, namely the armature slides to the stroke end of the rear end, the rear end of the armature is located on the rear side of the outer diversion trench, and the rear end of the outer diversion trench is closed. The control of the flow cross section is realized through the outer guide groove, and the part processing is simple.

As a further improvement of the design, the tail end of the inner wall of the sliding sleeve is provided with a rear annular groove, the inner wall of the sliding sleeve at the rear side of the stop block is provided with a front annular groove, the outer wall of the armature is provided with an overflow groove extending along the generatrix direction of the outer wall of the armature, the length of the overflow groove is greater than the minimum distance between the front annular groove and the rear annular groove, the length of the overflow groove is less than the maximum distance between the front annular groove and the rear annular groove, namely the armature slides to the front end stroke end point, the rear end of the overflow groove is positioned at the front side of the rear annular groove, the armature slides to the rear end stroke end point, and the front end of the overflow groove is positioned at the rear side of the front annular groove. The change of the flow section is realized by matching the flow passing groove with the front annular groove and the rear annular groove, and meanwhile, the anti-blocking effect is good.

As a further improvement of the design, the plunger rod is in interference fit with the armature, and the stop block is in interference fit with the sliding sleeve, so that the plunger rod and the armature can be assembled conveniently.

As a further improvement of the design, the avoiding notch is a chute extending along the rear end of the armature in the radial direction, and the boss is a wedge block with the same shape as the chute. The armature is convenient to limit.

As a further improvement of the design, the sliding sleeve is provided with at least two outer guide grooves, the outer guide grooves are distributed around the axis of the sliding sleeve in an annular array manner, the lateral force of the armature is balanced during flow guiding, and the armature is prevented from being blocked.

As a further improvement of the present design, at least two overflow grooves are provided on the armature, and the overflow grooves are distributed in an annular array around the axial direction of the armature. The side face stress of the armature is ensured to be balanced, and the armature is prevented from being blocked.

As a further improvement of the design, the stop block is provided with a fluid replenishing hole which penetrates through the stop block from front to back, so that the slide sleeve is ensured to be filled with fluid.

As a further improvement of the design, an annular groove is formed in one side, facing the armature, of the stop block, and the flow supplementing hole is communicated with the annular groove, so that the flow supplementing hole is conveniently communicated with the inside of the sliding sleeve.

The utility model has the advantages that: the utility model discloses utilize variable cross section runner structure to make armature move the damping system that the flow area changes along with the valve stroke change in the operation process. The change of the fluid flow area brings the change of the fluid flow damping, and finally the aim of controlling the motion damping of the valve body and the armature is achieved, so that the problems of improving the responsiveness and leakage, improving the collision between the valve body and the valve seat and between the armature and the sliding sleeve, reducing vibration, only influencing the resistance in the motion process, not influencing the final binding force between the valve body and the valve seat after being closed and seated, and not influencing the return driving force in the valve opening process are solved. The system damping is increased only when the valve is seated and at the opening end point, and then the resistance force disappears quickly, so that the valve has higher closing holding force, the leakage rate after the valve is closed is reduced, and in addition, the rigidity of a return spring can be properly improved, so that the system responsiveness is improved, and the system reliability is improved.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the overall cross-sectional structure of the solenoid valve of the present invention.

Fig. 2 is a schematic cross-sectional view of the first embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of the second embodiment of the present invention.

Fig. 4 is an overall sectional view of a third embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of the sliding sleeve according to the first embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of a sliding sleeve according to a second embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of a sliding sleeve according to a third embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view of the second and third embodiments of the present invention.

Fig. 9 is a schematic cross-sectional view of a first embodiment plunger rod of the present invention.

Fig. 10 is a perspective view of a first and second embodiment armature of the present invention.

Fig. 11 is a perspective view of a third embodiment armature of the present invention.

Fig. 12 is a schematic cross-sectional view of the stopper of the present invention.

Fig. 13 is a schematic view of the flow cross section of the front and rear ends of the armature of the present invention along with the change curve of the armature stroke.

In the figure, 1, a sliding sleeve, 2, a coil, 3, a valve block, 4, an air outlet, 5, an air inlet, 6, a return spring, 7, a valve seat, 8, a valve body, 9, a push rod, 10, a stop block, 11, a plunger rod, 12, an armature, 13, an avoidance notch, 14, a boss, 15, an outer diversion trench, 16, an overflow trench, 17, a rear annular trench, 18, a front annular trench, 19, a backflow hole, 20, an annular trench, 21, a flow supplement hole, 22, a main runner and 23, a sliding hole are arranged.

Detailed Description

The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and the description are only for the purpose of explanation, but not for the purpose of limitation.

Example 1: a fast response electromagnetic valve for fuel cell system, including sliding sleeve 1, set up in the coil 2 outside the said sliding sleeve 1, set up in the said sliding sleeve 1 and along the armature 12 of the axial slip of the said sliding sleeve 1, set up in the opening place of the said sliding sleeve 1 and is used for limiting the stop 10 of the sliding travel of the said armature 12, set up in the valve block 3 of the opening place of the said sliding sleeve 1, set up in the valve block 3 in the valve block 8, connect the said valve block 8 and push rod 9 of the said armature 12, set up in the said valve block 3 head and is used for the reset return spring 6 of the said valve block 8, the front end of the said valve block 3 has liquid inlet holes 5, an annular valve seat 7 is arranged in the valve block 3 at the rear end of the liquid inlet hole 5, the liquid inlet hole 5 is coaxial with the valve seat 7, an inner hole of the valve seat 7 is communicated with the liquid inlet hole 5, an air outlet hole 4 penetrating through the side wall of the valve block 3 is arranged on the side face of the valve block 3, the air outlet hole 4 is over against the side face of the valve body 8, the outer diameter of the valve body 8 is smaller than the inner diameter of the inner hole of the valve block 3, the outer diameter of the front end of the valve body 8 is larger than the diameter of the inner hole of the valve seat 7, namely, the valve body 8 is in a front limiting state, the front end of the valve body 8 abuts against an opening at the rear end of the inner hole of the valve seat 7, and the valve body 8 blocks the inner hole and the air outlet hole 4 of the valve seat 7; the variable cross-section runner structure is characterized in that a variable cross-section runner structure communicated with gaps between two ends of the armature 12 and the end part of the sliding sleeve 1 is arranged between the armature 12 and the sliding sleeve 1, and the runner cross section of the variable cross-section runner structure is gradually reduced when the armature 12 slides to a stroke end.

The above design utilizes a variable cross-section flow path structure to provide a damping system in which the flow area of armature 12 varies with valve travel during operation. The change of the fluid flow area brings the change of the fluid flow damping, finally achieve the purpose of controlling the motion damping of the valve body 8 and the armature 12, thereby improving the response and leakage, improving the collision between the valve body 8 and the valve seat 7 and between the armature 12 and the sliding sleeve 1, reducing vibration, only influencing the resistance in the motion process, not influencing the final binding force of the valve body 8 and the valve seat 7 after closing and seating, and not influencing the return driving force in the valve opening process. The system damping is increased only when the valve is seated and at the opening end moment, and then the resistance force disappears quickly, so that the valve has higher closing holding force, and the leakage rate after the valve is closed is reduced. In addition, the rigidity of the return spring 6 can be properly improved, so that the system responsiveness is improved, and the system reliability is improved.

As a further improvement of the design, the variable cross-section flow channel structure of the electromagnetic valve includes a hollow plunger rod 11 arranged at the head of the armature 12 and having a closed head, a boss 14 arranged on the inner wall of the rear end of the sliding sleeve 1, and an avoidance notch 13 arranged at the rear end of the armature 12 and facilitating insertion of the boss 14, wherein the plunger rod 11 is provided with a return hole 19 penetrating through the side wall of the plunger rod 11, the armature 12 is provided with a main flow channel 22 penetrating through the armature 12 from front to back, the rear end of the plunger rod 11 is communicated with the main flow channel 22, the stopper 10 is provided with a slide hole 23 facilitating penetration of the plunger rod 11, the outer diameter of the plunger rod 11 is in clearance fit with the inner diameter of the slide hole 23, the outer diameter of the head of the boss 14 is smaller than the outer diameter of the rear end, the outer diameter of the front end of the avoidance notch 13 is smaller, that is, the armature 12 is located at the front stroke end point, and the side surface of the plunger rod 11, which is provided with the return hole 19, is completely located in the slide hole 23 of the slide hole of the stopper 10 or in the sliding sleeve 1 at the front end of the stopper 10. The variable cross-section flow passage structure adopts a hollow plunger piston to be provided with a return hole 19, realizes the control of the flow cross section between the armature 12 and the end part of the sliding sleeve 1 by utilizing the boss 14 and the avoiding notch 13, has simple structure and reduces the replacement cost.

As a further improvement of the present design, the relief notch 13 is a tapered slot extending radially along the rear end of the armature 12, and the boss 14 is a wedge having the same shape as the tapered slot. Limiting the position of the armature 12.

As a further improvement of the design, the plunger rod 11 is in interference fit with the armature 12, and the stopper 10 is in interference fit with the sliding sleeve 1, so that the assembly of the plunger rod 11 and the armature 12 is facilitated.

As a further improvement of the design, the stop block 10 is provided with a flow supplementing hole 21 which penetrates through the stop block 10 from front to back so as to ensure that the sliding sleeve 1 is filled with fluid.

As a further development of this design, the stop 10 is provided with an annular groove 20 on the side facing the armature 12, and the flow compensation opening 21 communicates with the annular groove 20, so that the flow compensation opening 21 communicates with the interior of the sliding sleeve 1.

During operation, the sliding sleeve 1 is filled with fluid, in the valve closing process, the armature 12 moves towards the stop block 10, and the fluid between the armature 12 and the stop block 10 flows to a gap between the armature 12 and the rear end of the sliding sleeve 1 through the return hole 19. Along with the armature 12 moves towards the end of the stop block 10, the flow area of the return hole 19 is smaller and smaller, and the flow resistance is larger and larger, before the valve body 8 contacts the valve seat 7, the return hole 19 is completely closed, and the fluid between the armature 12 and the stop block 10 cannot continuously flow to the gap between the armature 12 and the bottom of the sliding sleeve 1, so that the movement resistance of the armature 12 is increased sharply, the electromagnetic force is greatly counteracted, the impact when the valve body 8 contacts the valve seat 7 is greatly reduced, and the reliability of the system is improved. Meanwhile, after the valve is seated, due to the clearance between the armature 12 and the sliding sleeve 1, the fluid at the two ends of the armature 12 is quickly restored to balance, and the electromagnetic force completely acts on the valve body 8, so that the sealing between the valve body 8 and the valve seat 7 is ensured, the leakage rate is reduced, and the overall reliability of the assembly is improved.

When the valve is opened and the armature 12 moves towards the rear end of the sliding sleeve 1, the fluid in the gap between the armature 12 and the bottom of the sliding sleeve 1 flows to the space between the armature 12 and the stop 10 through the return hole 19. Along with the movement of the armature 12 towards the rear end of the sliding sleeve 1, the flow area of the gap 13 avoided by the bottom of the armature 12 is smaller and smaller, and the flow resistance is larger and larger, before the armature 12 contacts with the rear end of the sliding sleeve 1, the avoiding gap 13 is completely closed, and the fluid in the gap between the armature 12 and the bottom of the sliding sleeve 1 cannot continuously flow to the gap between the armature 12 and the stop block 10, so that the movement resistance of the armature 12 is increased sharply, the spring force is counteracted greatly, the impact when the armature 12 contacts with the bottom of the sliding sleeve 1 is greatly reduced, and the reliability of the system is improved.

Example 2: the difference between the present embodiment and embodiment 1 is that the variable cross-section flow channel structure includes an outer flow guide groove 15 disposed on the inner wall of the sliding sleeve 1 and extending along a generatrix of the inner wall of the sliding sleeve 1, the head of the armature 12 is provided with a plunger rod 11 connected with the push rod 9, the stopper 10 is provided with a slide hole 23 matched with the plunger rod 11, the length of the outer flow guide groove 15 is smaller than a total stroke of the armature 12 sliding back and forth, the front end of the outer flow guide groove 15 is located behind a stroke end of the front end of the armature 12, that is, the armature 12 slides to the stroke end of the front end, the front end of the armature 12 is located on the front side of the outer flow guide groove 15, and the front end of the outer flow guide groove 15 is closed; the rear end of the outer diversion trench 15 is located on the front side of the rear end stroke end point of the armature 12, namely the armature 12 slides to the rear end stroke end point, the rear end of the armature 12 is located on the rear side of the outer diversion trench 15, and the rear end of the outer diversion trench 15 is closed. The control of the flow cross section is realized through the outer guide groove 15, and the part processing is simple.

As a further improvement of the design, the sliding sleeve 1 is provided with at least two outer guide grooves 15, the outer guide grooves 15 are distributed around the axis of the sliding sleeve 1 in an annular array manner, the lateral surface of the armature 12 is stressed in a balanced manner during flow guiding, and the armature 12 is prevented from being blocked.

In operation, the armature 12 and sleeve 1 assembly are filled with fluid. When the valve begins to close, the armature 12 moves towards the end of the stop 10, and fluid between the armature 12 and the stop 10 flows through the outer guide groove 15 to the gap between the armature 12 and the rear end of the sliding sleeve 1. Along with the movement of the armature 12 to the end of the stop block 10, the flow area of the outer diversion trench 15 is smaller and smaller, and the flow resistance is larger and larger, before the valve body 8 contacts the valve seat 7, the outer diversion trench 15 is completely closed, and the fluid between the armature 12 and the stop block 10 can not continuously flow to the gap between the armature 12 and the bottom of the sliding sleeve 1, so that the movement resistance of the armature 12 is increased rapidly, the electromagnetic force is greatly counteracted, the impact when the valve body 8 contacts the valve seat 7 is greatly reduced, and the system reliability is improved. Meanwhile, after the valve is seated, due to the clearance between the armature 12 and the sliding sleeve 1, the fluid at the two ends of the armature 12 is quickly balanced, and the electromagnetic force completely acts on the valve body 8, so that the sealing between the valve body 8 and the valve seat 7 is ensured, the leakage rate is reduced, and the overall reliability of the assembly is improved.

When the valve is opened and the armature 12 moves towards the bottom of the sliding sleeve 1, the fluid in the gap between the armature 12 and the bottom of the sliding sleeve 1 flows to the space between the armature 12 and the stop 10 through the outer diversion groove 15. Along with the movement of the armature 12 towards the rear end of the sliding sleeve 1, the flow area of the flow channel between the outer diversion trench 15 and the rear end of the armature 12 is smaller and smaller, and the flow resistance is larger and larger, when the armature 12 contacts with the rear end of the sliding sleeve 1, the outer diversion trench 15 and the flow channel are completely closed, fluid in the gap between the armature 12 and the bottom of the sliding sleeve 1 cannot continuously flow to the gap between the armature 12 and the stop block 10, so that the movement resistance of the armature 12 is increased sharply, the spring force is greatly offset, the impact when the armature 12 contacts with the bottom of the sliding sleeve 1 is greatly reduced, and the reliability of the system is improved.

Example 3: the difference between this embodiment and the other embodiments is that the variable cross-section flow channel structure includes a rear annular groove 17 disposed at the tail end of the inner wall of the sliding sleeve 1, the inner wall of the sliding sleeve 1 at the rear side of the stopper 10 is provided with a front annular groove 18, the outer wall of the armature 12 is provided with a flow passing groove 16 extending along the bus direction of the outer wall of the armature 12, the length of the flow passing groove 16 is greater than the minimum distance between the front annular groove 18 and the rear annular groove 17, the length of the flow passing groove 16 is smaller than the maximum distance between the front annular groove 18 and the rear annular groove 17, that is, the armature 12 slides to the front end stroke end, the rear end of the flow passing groove 16 is located at the front side of the rear annular groove 17, the armature 12 slides to the rear end stroke end, and the front end of the flow passing groove 16 is located at the rear side of the front annular groove 18. The change of the flow cross section is realized by the cooperation of the overflow groove 16 with the front annular groove 18 and the rear annular groove 17, and the anti-blocking effect is good

As a further improvement of the present design, at least two overflow grooves 16 are provided on the armature 12, and the overflow grooves 16 are distributed in an annular array around the axial direction of the armature 12. The side face of the armature 12 is stressed evenly, and the armature 12 is prevented from being stuck.

In operation, the armature 12 and the sleeve 1 assembly are filled with fluid. When the valve begins to close, the armature 12 moves towards the end of the stop 10, and fluid between the armature 12 and the stop 10 flows through the rear annular groove 17, the front annular groove 18 and the flow passage of the flow passage groove 16 to the gap between the armature 12 and the rear end of the sliding sleeve 1. Along with the movement of the armature 12 to the stop block 10, the flow area of the front annular groove 18 is smaller and smaller, and the flow resistance is larger and larger, before the valve body 8 contacts with the valve seat 7, the front annular groove 18 is completely closed, and the fluid between the armature 12 and the stop block 10 cannot continuously flow to the gap between the armature 12 and the rear end of the sliding sleeve 1, so that the movement resistance of the armature 12 is increased sharply, the electromagnetic force is greatly counteracted, the impact when the valve body 8 contacts with the valve seat 7 is greatly reduced, and the system reliability is improved. Meanwhile, after the valve is seated, due to the clearance between the armature 12 and the sliding sleeve 1, the fluid at the two ends of the armature 12 is quickly restored to be balanced, and the electromagnetic force completely acts on the valve body 8, so that the sealing between the valve body 8 and the valve seat 7 is ensured, the leakage rate is reduced, and the overall reliability of the assembly is improved.

When the valve is opened and the armature 12 moves towards the bottom of the sliding sleeve 1, the fluid in the gap between the armature 12 and the bottom of the sliding sleeve 1 flows to the space between the armature 12 and the stop block 10 through the rear annular groove 17, the front annular groove 18 and the overflow groove 16. Along with the movement of the armature 12 towards the rear end of the sliding sleeve 1, the flow area of the rear annular groove 17 and a flow passage at the bottom of the armature 12 is smaller and smaller, and the flow resistance is larger and larger, when the armature 12 is in contact with the rear end of the sliding sleeve 1, the rear annular groove 17 and the flow passing groove 16 are completely closed, fluid in a gap between the armature 12 and the bottom of the sliding sleeve 1 cannot continuously flow to a gap between the armature 12 and the stop block 10, so that the movement resistance of the armature 12 is increased sharply, the spring force is counteracted greatly, the impact when the armature 12 is in contact with the bottom of the sliding sleeve 1 is greatly reduced, and the system reliability is improved.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The utility model provides a quick response solenoid valve for fuel cell system, include the solenoid valve sliding sleeve, set up in just follow in the sliding sleeve endwise slip's armature, set up in the sliding sleeve opening part is used for the restriction the dog of armature sliding stroke, its characterized in that, armature with be equipped with the intercommunication between the sliding sleeve the variable cross section runner structure in armature both ends and sliding sleeve tip space, variable cross section runner structure is in armature slides to stroke terminal in-process the runner cross-section of variable cross section runner structure is earlier the grow and is reduced gradually again.

2. The quick response electromagnetic valve for the fuel cell system according to claim 1, wherein the variable cross-section flow passage structure of the electromagnetic valve comprises a hollow plunger rod arranged at the head of the armature and having a closed head, a boss arranged on the inner wall of the tail end of the sliding sleeve, and an avoidance notch arranged at the tail end of the armature and facilitating insertion of the boss, the plunger rod is provided with a backflow hole penetrating through the side wall of the plunger rod, the armature is provided with a main flow passage penetrating through the armature from front to back, the tail end of the plunger rod is communicated with the main flow passage, the stopper is provided with a slide hole facilitating penetration of the plunger rod, the outer diameter of the plunger rod is in clearance fit with the inner diameter of the slide hole, the outer diameter of the head of the boss is smaller than the outer diameter of the tail end, the outer diameter of the front end of the avoidance notch is smaller when the armature slides to the tail end of the sliding sleeve, the clearance between the boss and the avoidance notch becomes smaller, the armature is located at the front stroke end, and the side of the plunger rod provided with the backflow hole is completely located in the slide hole of the sliding sleeve or in the sliding sleeve at the front end of the stopper.

3. The quick response solenoid valve for the fuel cell system as claimed in claim 1, wherein the variable cross-section flow channel structure of the solenoid valve includes an outer flow guiding groove disposed on the inner wall of the sliding sleeve and extending along the generatrix of the inner wall of the sliding sleeve, the head of the armature is provided with a plunger rod, the stopper is provided with a slide hole matching with the plunger rod, the length of the outer flow guiding groove is smaller than the total stroke of the armature sliding forwards and backwards, the front end of the outer flow guiding groove is located behind the stroke end of the front end of the armature, i.e. the armature slides to the stroke end of the front end, the front end of the armature is located on the front side of the outer flow guiding groove, and the front end of the outer flow guiding groove is closed; the rear end of the outer diversion trench is located on the front side of the stroke end of the rear end of the armature, namely the armature slides to the stroke end of the rear end, the rear end of the armature is located on the rear side of the outer diversion trench, and the rear end of the outer diversion trench is closed.

4. The fast response solenoid valve for the fuel cell system according to claim 1, wherein the variable cross-section flow channel structure of the solenoid valve includes a rear annular groove disposed at the rear end of the inner wall of the sliding sleeve, the inner wall of the sliding sleeve at the rear side of the stopper is provided with a front annular groove, the outer wall of the armature is provided with an oil passing groove extending along the generatrix direction of the outer wall of the armature, the length of the oil passing groove is greater than the minimum distance between the front annular groove and the rear annular groove, the length of the oil passing groove is less than the maximum distance between the front annular groove and the rear annular groove, that is, the armature slides to the front end stroke end, the rear end of the oil passing groove is located at the front side of the rear annular groove, the armature slides to the rear end stroke end, and the front end of the oil passing groove is located at the rear side of the front annular groove.

5. The fast response solenoid valve for a fuel cell system of claim 1, wherein said solenoid plunger rod is in interference fit with said armature, and said stop is in interference fit with said sliding sleeve.

6. The fast response solenoid valve for a fuel cell system of claim 2, wherein said internal relief notch of said solenoid valve is a tapered slot extending radially along a rear end of said armature, and said boss is a wedge having the same shape as said tapered slot.

7. The fast response solenoid valve for a fuel cell system of claim 3, wherein said solenoid valve sliding sleeve has at least two outer channels disposed therein, said outer channels being arranged in an annular array about said sliding sleeve axis.

8. The fast response solenoid valve for a fuel cell system as claimed in claim 4, wherein at least two oil passing grooves are formed on the armature of the solenoid valve, and the oil passing grooves are distributed in an annular array around the axial direction of the armature.

9. The quick response solenoid valve for a fuel cell system as set forth in claim 1, wherein the solenoid valve stopper is provided with an oil replenishment hole penetrating the stopper in a front and rear direction.

10. The quick response solenoid valve for a fuel cell system as set forth in claim 9, wherein said solenoid valve stopper is provided with an annular groove at a side facing said armature, and said oil replenishment hole is communicated with said annular groove.

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