Air path block valve device of hydrogen fuel cell device

Abstract

The utility model relates to an air path block valve device of a hydrogen fuel cell device, which comprises a plastic cover plate assembly, a plastic cover plate screw, a metal shaft, a valve body, a motor assembly, an intermediate gear pin, an intermediate transmission gear, a sector gear assembly, a three-lip needle bearing, a C-shaped clamping ring, a valve plate, a sealing valve seat and a fixing ring, the three-lip needle bearing is installed in a lower bearing hole of the valve body in an interference pressing mode, the C-shaped clamping ring is installed in a groove of the metal shaft, and the metal shaft is axially limited through the C-shaped clamping ring. The valve plate is fixed on the metal shaft; the intermediate transmission gear is meshed with the motor assembly and the sector gear assembly; the plastic cover plate assembly is installed on the valve body through cover plate screws. According to the air path block valve device of the hydrogen fuel cell device, the zero-leakage angle range of the valve plate and the valve seat at the sealing position is large, the mounting and matching requirements of the valve plate and the valve seat are reduced, the problem of welding seam corrosion is thoroughly solved, and the production line investment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen fuel cell device field especially three eccentric valve field, concretely refers to a kind of hydrogen fuel cell device air path cut-off valve device. BACKGROUND

[0002] With the increasing attention of international society to carbon emission, carbon peak and carbon neutral target are clear, in energy saving and carbon reduction, various technical routes develop simultaneously, such as the application of pure electric or hybrid power device to eliminate or reduce carbon emission, another technical route is to use zero-carbon energy to replace fossil fuel, for example, hydrogen, through green electricity such as wind and light to generate electricity and then electrolyze water to produce hydrogen, there is no carbon emission in the whole hydrogen production chain, and the produced hydrogen can be used to replace fossil fuel such as gasoline or diesel in hydrogen internal combustion engine, and the combustion product is water, realizing zero emission, and it can also be used in hydrogen fuel cell device to generate electricity through chemical reaction of hydrogen and oxygen in air under the action of catalyst, as electric energy to drive vehicle, and the reaction product is only water without any pollutant generation. As one of the important clean energy forms to reach carbon peak in the future, hydrogen fuel cell device is very suitable for long-distance commercial vehicle transportation scene, and for ship and aircraft use, however, hydrogen fuel cell device has extremely strict requirements for air intake flow and sealing, especially after hydrogen fuel cell stack is closed, air inlet and outlet of stack need to be cut off through air path cut-off valve to avoid external air entering stack to cause aging and failure of internal core components of stack.

[0003] At present, the existing fuel cell air path cut-off valve technology mainly uses two eccentric butterfly valves, the rotation center of valve plate is offset from valve sealing surface to realize cut-off sealing requirement, for newly manufactured double eccentric cut-off valve, sealing requirement can meet the air tightness requirement of stack closed, but double eccentric butterfly valve has durability problem, valve plate needs to be extruded into sealing valve seat through sliding to generate sealing, each time valve plate rotates into or rotates out of sealing position, about 25° angle stroke sliding friction will be generated with sealing valve seat, long-time friction leads to wear of sealing valve seat, rubber debris pollutes stack, and sealing failure will cause permanent degradation or even scrap of stack device function; for valve itself, long-time friction of valve plate with rubber valve seat will generate skin stretching and high stickiness, causing valve plate to be stuck and unable to open or close, which generates stall, and stall will generate motor burning and stack sealing failure problem.

[0004] For a small amount of right tri-eccentric design scheme, manufacturer determines eccentric parameter and rotation center position by using drawing method according to tri-eccentric valve design experience, there is poor compression uniformity of valve body and sealing valve seat, which leads to sealing failure, the eccentric position is not at the optimal position, and valve plate eccentricity is too large, which can lead to flutter and unstable position under the action of inlet pressure.

[0005] Another leakage failure point is the detachment of the rubber from the metal insert on the rubber valve seat. This type of design uses vulcanization to vulcanize the rubber part onto the metal insert, with the rubber partially enclosing the metal insert. The outer ring of the metal insert is press-fitted into the valve body hole. Due to the limited bonding strength between the rubber and the metal, after a period of use, the rubber will separate from the metal part and fall off, resulting in the failure of the sealing function.

[0006] Finally, the water vapor produced by the hydrogen fuel cell reaction is acidic and corrosive. Traditional aluminum alloy valve bodies suffer from corrosion, producing white oxide particles that contaminate the fuel cell stack, causing performance degradation or even scrapping of the stack.

[0007] (1) Existing dual-eccentric design schemes, such as Figure 1 As shown, the valve plate's rotation center is not located at the center of the sealing surface, exhibiting eccentricity in two directions: radial and axial. To ensure sealing under pressure, the valve plate needs to be squeezed into the rubber valve seat sealing position via sliding compression. Within an angle stroke range of approximately 25°, the valve plate will experience sliding friction with the lip of the rubber valve seat. Due to this sliding friction, after a period of use, the rubber valve seat will experience frictional wear, generating wear particles, rubber strips, and becoming sticky, leading to excessive leakage and failure. The wear particles will enter the fuel cell stack, affecting its performance. The stickiness of the rubber valve seat will generate significant viscous forces, preventing the valve plate from being squeezed into the rubber valve seat or from opening, resulting in product failure and a risk of motor burnout. The valve plate's inability to enter the sealing position will cause fuel cell stack airtightness failure, resulting in irreversible aging damage to the fuel cell stack.

[0008] (2) Existing technical methods for drawing three-eccentric design schemes, such as Figure 2 As shown, there are currently a small number of triple eccentric valve designs on the market. The design of triple eccentric valves is much more complex than that of double eccentric valves. It is generally difficult for engineering technicians to perform analytical design calculations, so the design parameters of triple eccentric valves are basically designed using a graphical method. The design principle is based on empirical values. The design is carried out according to empirical angles (tangent cone), and the intersection point is the rotation center of the valve plate. This method can avoid the problem of interference between the valve plate and the rubber valve seat during the opening and closing process. However, the disadvantage is that the uniformity of the compression and sealing between the valve plate and the rubber valve seat cannot be determined. There may be a large closing torque and uneven compression of the valve seat, which will lead to weak points in the sealing performance. The product leakage qualification rate will be reduced, and the leakage durability cannot be fully guaranteed. In addition, if the eccentric position is not designed properly, the valve plate may vibrate under the action of airflow pressure when installed at a certain opening degree.

[0009] Meanwhile, the design of the equilateral triangle eccentricity makes the sealing ring angle range between the valve plate and the valve seat narrow, so the installation size and position of the valve plate and the sealing valve seat are extremely high, otherwise it will cause low yield, in order to solve such problems, the market adopts laser welding of the valve plate and the metal shaft, that is, the valve plate and the rubber valve seat are first in the sealing position, and then laser welding, so that after welding, the valve plate and the valve seat can meet the sealing requirements, but the laser welding seam will change due to high heat, the corrosion resistance is reduced, and rust will occur during product use, affecting the performance of the electric pile. Utility model content

[0010] The utility model discloses overcome the shortcoming of prior art, provide a kind of hydrogen fuel cell device air path cut-off valve device, which satisfies simple structure, sealing effect is good, and the application range is more extensive.

[0011] In order to achieve the above object, the hydrogen fuel cell device air path cut-off valve device is as follows:

[0012] The hydrogen fuel cell device air path cut-off valve device, its main features are that the device includes plastic cover plate assembly, plastic cover plate screw, metal shaft, valve body, motor assembly, intermediate gear pin, intermediate transmission gear, sector gear assembly, three-lip needle bearing, C-shaped ring, valve plate, sealing valve seat and fixing ring, the motor assembly and the intermediate gear pin are installed on the valve body, the lower bearing hole of the valve body is interference-pressed with the three-lip needle bearing, the C-shaped ring is installed in the groove of the metal shaft, and the metal shaft is axially limited by the C-shaped ring;The valve plate is fixed on the metal shaft, the sealing valve seat is interference-pressed on the valve body, the sealing valve seat is interference-fitted with the valve body in radial and axial directions, and the fixing ring is interference-pressed in the corresponding hole of the valve body;The sector gear assembly is at the mechanical lower stop point position on the valve body, and the valve plate is also at the sealing position with the sealing valve seat;The intermediate transmission gear is engaged with the motor assembly, and the intermediate transmission gear is also engaged with the sector gear assembly;The plastic cover plate assembly is installed on the valve body by the cover plate screw.

[0013] Preferably, the three-lip needle bearing is sleeved into the upper end of the metal shaft, the three-lip needle bearing is installed into the bearing hole of the valve body together with the C-shaped ring, the three-lip needle bearing is pressed into the upper bearing hole of the valve body, and the C-shaped ring is extruded on the bottom surface of the three-lip needle bearing and the bottom surface of the bearing hole of the valve body.

[0014] Preferably, the sealing surface of the valve plate is an outer inclined conical surface, the sealing surface of the sealing valve seat is an inner inclined conical surface, the outer inclined conical surface and the inner conical surface form a sealing surface, and the valve plate only contacts the sealing valve seat at the sealing position.

[0015] Preferably, the sealing valve seat is provided with a semicircular tongue, the valve body is provided with a semicircular groove, the semicircular groove of the valve body is matched with the semicircular tongue of the sealing valve seat, the valve plate is provided with a threaded hole, and the valve plate is fixed on the metal shaft through a valve plate screw.

[0016] Preferably, the device further comprises a return spring, the hook end of the return spring is hung on the stand of the fan-shaped gear assembly, the other end is hung on the stand of the valve body, the return spring is pre-tightened by rotating the fan-shaped gear assembly and is loaded into the valve body until the hole of the insert on the fan-shaped gear assembly is matched with the matched shaft segment of the metal shaft, the fan-shaped end surface of the fan-shaped gear assembly is in contact with the mechanical lower stop position limiting surface on the valve body, and the fan-shaped gear assembly is in the mechanical lower stop position; the valve plate is completely attached to the sealing valve seat, the fan-shaped gear assembly is welded on the metal shaft, and the full-closed position of the valve plate is fixedly connected with the mechanical lower stop position of the fan-shaped gear assembly on the valve body.

[0017] Preferably, the device further comprises a magnet, the magnet is fixedly connected to the fan-shaped gear assembly, the intermediate transmission gear is located on the intermediate gear pin, the large gear of the intermediate transmission gear is engaged with the motor gear of the motor assembly, and the small gear of the intermediate transmission gear is engaged with the fan-shaped gear assembly.

[0018] Preferably, the plastic cover plate assembly comprises a sealing ring and a programmable angle sensor, the sealing ring generates compression to form a sealing gear cavity, and the programmable angle sensor and the magnet fixedly connected to the fan-shaped gear assembly form an angle detection unit.

[0019] Preferably, the sealing surface of the sealing valve seat is a flexible lip, and in the case that the valve inlet is under positive pressure or the valve outlet is under negative pressure, the sealing surface of the flexible lip of the sealing valve seat is attached to the sealing surface of the valve plate under the action of pressure difference.

[0020] The air path cut-off valve device of the hydrogen fuel cell device adopts the flexible lip sealing surface design scheme for the rubber valve seat, the zero leakage angle range of the valve plate and the valve seat at the sealing position is large, the installation matching requirement of the valve plate and the valve seat is greatly reduced, the screw installation is adopted for the installation of the valve plate and the metal shaft of the utility model, laser welding is not adopted, the sealing requirement can be met without special control, the welding seam corrosion problem is completely solved, and the production line investment is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic view of a two-eccentricity scheme of the prior art.

[0022] Figure 2 It is a schematic view of a three-eccentricity structure of the prior art.

[0023] Figure 3The utility model discloses a hydrogen fuel cell device air path cut-off valve device shaft view.

[0024] Figure 4 The utility model discloses a hydrogen fuel cell device air path cut-off valve device front view.

[0025] Figure 5 The utility model discloses a hydrogen fuel cell device air path cut-off valve device sectional view.

[0026] Figure 6 The utility model discloses a hydrogen fuel cell device air path cut-off valve device valve plate, valve seat sealing position sectional view.

[0027] Figure 7 The utility model discloses a hydrogen fuel cell device air path cut-off valve device valve plate, valve seat sealing position sectional view.

[0028] Figure 8 The utility model discloses a hydrogen fuel cell device air path cut-off valve device gear cavity internal structure schematic view.

[0029] Figure 9 The utility model discloses a hydrogen fuel cell device air path cut-off valve device valve seat sealing ring and aluminum body positioning structure schematic view.

[0030] Reference signs:

[0031] 1 plastic cover plate assembly

[0032] 1.1 sealing ring

[0033] 1.2 programmable angle sensor

[0034] 2 plastic cover plate screw

[0035] 3 metal shaft

[0036] 4 valve body

[0037] 5 valve plate screw

[0038] 6 motor assembly

[0039] 6.1 motor gear

[0040] 7 motor screw

[0041] 8 intermediate gear pin

[0042] 9 intermediate transmission gear

[0043] 10 magnet

[0044] 11 sector gear assembly

[0045] 11.1 insert

[0046] 12 return spring

[0047] 13 three-lip needle bearing

[0048] 14 C-shaped collar

[0049] 15 plug

[0050] 16 valve plate

[0051] 17 sealing valve seat

[0052] 18 fixing ring

[0053] 20 sealing valve seat and valve body mounting positioning structure DETAILED DESCRIPTION

[0054] In order to describe the technical content of the utility model more clearly, further description will be made in combination with specific embodiments.

[0055] The hydrogen fuel cell device air path cut-off valve device of the utility model, wherein, it comprises a plastic cover plate assembly 1, a plastic cover plate screw 2, a metal shaft 3, a valve body 4, a motor assembly 6, a middle gear pin 8, a middle transmission gear 9, a sector gear assembly 11, a three-lip needle bearing 13, a C-shaped collar 14, a valve plate 16, a sealing valve seat 17 and a fixing ring 18, the motor assembly 6 and the middle gear pin 8 are installed on the valve body 4, the lower bearing hole of the valve body 4 is press-fitted with the three-lip needle bearing 13, the C-shaped collar 14 is installed in the groove of the metal shaft 3, and the metal shaft 3 is axially limited through the C-shaped collar 14; the valve plate 16 is fixed on the metal shaft 3, the sealing valve seat 17 is press-fitted on the valve body 4, the sealing valve seat 17 is radially and axially in interference fit with the valve body 4, and the fixing ring 18 is press-fitted in the corresponding hole of the valve body 4; the sector gear assembly 11 is at the mechanical lower dead point position on the valve body 4, and the valve plate 16 is also at the sealing position with the sealing valve seat 17; the middle transmission gear 9 is engaged with the motor assembly 6, and the middle transmission gear 9 is also engaged with the sector gear assembly 11; the plastic cover plate assembly 1 is installed on the valve body 4 through the cover plate screw 2.

[0056] As a preferred embodiment of the utility model, the three-lip needle bearing 13 is sleeved into the upper end of the metal shaft 3, the three-lip needle bearing 13 is installed into the bearing hole of the valve body 4 together with the C-shaped collar 14, the three-lip needle bearing 13 is press-fitted into the upper bearing hole of the valve body 4, and the three-lip needle bearing 13 extrudes the C-shaped collar 14 at the bottom surface of the three-lip needle bearing 13 and the bottom surface of the bearing hole of the valve body 4.

[0057] As the preferred embodiment of the utility model, the sealing surface of the valve plate 16 is an outer inclined conical surface, the sealing surface of the sealing valve seat 17 is an inner inclined conical surface, the outer inclined conical surface and the inner conical surface cooperate to form a sealing surface, and the valve plate 16 only contacts the sealing valve seat 17 at the sealing position.

[0058] As the preferred embodiment of the utility model, the sealing valve seat 17 is provided with a semicircular tongue, the valve body 4 is provided with a semicircular groove, the semicircular groove of the valve body 4 and the semicircular tongue of the sealing valve seat 17 cooperate with each other, the valve plate 16 is provided with a threaded hole, the device further comprises a return spring 12, one end of the hook of the return spring 12 is hung on the stand of the sector gear assembly 11, the other end is hung on the stand of the valve body 4, the return spring 12 is pre-tightened by rotating the sector gear assembly 11 and is loaded into the valve body 4 until the hole of the insert 11.1 on the sector gear assembly 11 is matched with the matched shaft section of the metal shaft 3, the sector end surface of the sector gear assembly 11 contacts the mechanical lower stop limit surface on the valve body 4, and the sector gear assembly 11 is in the mechanical lower stop position.

[0059] As the preferred embodiment of the utility model, the device further comprises a magnet 10, the magnet 10 is fixed to the sector gear assembly 11, the intermediate transmission gear 9 is located on the intermediate gear pin 8, the large gear of the intermediate transmission gear 9 is engaged with the motor gear 6.1 of the motor assembly 6, and the small gear of the intermediate transmission gear 9 is engaged with the sector gear assembly 11.

[0060] As the preferred embodiment of the utility model, the plastic cover plate assembly 1 comprises a sealing ring 1.1 and a programmable angle sensor 1.2, the sealing ring 1.1 generates compression to form a sealing gear cavity, and the programmable angle sensor 1.2 and the magnet 10 fixed to the sector gear assembly 11 form an angle detection unit.

[0061] As the preferred embodiment of the utility model, the sealing surface of the sealing valve seat 17 is a flexible lip, and in the case that the valve inlet is under positive pressure or the valve outlet is under negative pressure, the sealing surface of the flexible lip of the sealing valve seat 17 is tightly attached to the sealing surface of the valve plate 16 under the action of the pressure difference.

[0062] The utility model discloses to the current two eccentric valves and three eccentric valves's problem in the application and design process, the utility model discloses to solve the problem of the two kinds of valves currently by numerical method, utilize the analytic method to establish three eccentric valve rotation center and eccentric parameter calculation equation, and the rotation center optimum position of three eccentric valve under the corresponding pipe diameter and the eccentric parameter of valve plate valve seat angle are obtained by numerical interpolation method optimization algorithm, make the compression uniformity of valve plate to rubber seal ring reach consistent, and the sealing has no short board.

[0063] In the embodiment of the utility model, hydrogen fuel cell device air path cutoff valve includes plastic cover plate assembly 1, plastic cover plate screw 2, metal shaft 3, valve body 4, valve plate screw 5, motor assembly 6, motor screw 7, intermediate gear pin 8, intermediate transmission gear 9, magnet 10, sector gear assembly 11, return spring 12, three-lip needle bearing 13, C-shaped collar 14, plug 15, valve plate 16, sealing valve seat 17, fixed ring 18.

[0064] As Figures 3-4 The utility model discloses to hydrogen fuel cell device air path cutoff valve, the cutoff valve include valve body 4, and the motor assembly 6 and intermediate gear pin 8 are installed on valve body 4, and the three-lip needle bearing 13 is pressed and is equipped in the bearing hole of valve body 4 below, and the C-shaped collar 14 is installed in the groove of metal shaft 3, and the three-lip needle bearing 13 is inserted into the upper end of metal shaft 3, together with C-shaped collar 14 is installed in the bearing hole of valve body, and the three-lip needle bearing 13 is pressed into the upper bearing hole of valve body 4.

[0065] The sealing valve seat 17 of valve body 4 installs the hole and is provided with semicircle hole, and the sealing valve seat 17 is provided with semicircle tongue, and the installation direction positioning between sealing valve seat and valve body is guaranteed by the semicircle groove on valve body 4 and the semicircle tongue structure on sealing valve seat 4 cooperation, and the sealing valve seat 17 is pressed and is equipped on valve body 4, and the sealing valve seat 17 is in radial and axial interference fit with valve body 4. Fixed ring 18 is pressed and is equipped in the corresponding hole of valve body 4, and the sealing valve seat 17 is fixed, and the valve plate 16 is equipped with threaded hole, and the valve plate 16 is fixed on metal shaft 3 by valve plate screw 5.

[0066] The hook of the return spring 12 is hung on the post of the sector gear assembly 11 at one end and on the post of the valve body 4 at the other end. The return spring 12 is pre-tightened by rotating the sector gear assembly 11 and is loaded into the valve body 4 until the hole of the insert 11.1 on the sector gear assembly 11 is matched with the matched shaft segment of the metal shaft 3, at which time the sector gear assembly 11 is released, the sector end surface is in contact with the mechanical lower stop limiting surface on the valve body 4, and the sector gear assembly 11 is in the mechanical lower stop position. The valve plate 16 fixed on the metal shaft 3 is rotated to the sealing position of the sealing valve seat 17 by a tool, the position is kept, the sector gear assembly 11 is welded on the metal shaft 3 by laser welding, at which time the full-closed position of the valve plate 16 is fixed with the mechanical lower stop position of the sector gear assembly 11 on the valve body 4, that is, the sector gear assembly 11 is rotated to the mechanical lower stop position on the valve body 4, and the valve plate 16 is also rotated to the sealing position of the sealing valve seat 17, thereby generating the function of cutting off the air flow;

[0067] Further, the magnet 10 is fixed on the sector gear assembly 11, and the intermediate transmission gear 9 is put on the intermediate gear pin 8, so that the large gear of the intermediate transmission gear 9 is engaged with the motor gear 6.1, and the small gear of the intermediate transmission gear 9 is engaged with the sector gear assembly 11. The rotation and torque of the motor can be transmitted to the sector gear assembly 11 through the intermediate transmission gear 9, thereby driving the valve plate to perform the opening degree adjustment action.

[0068] Finally, the plastic cover plate assembly 1 is installed on the valve body 4 through the cover plate screw 2, the sealing ring 1.1 on the plastic cover plate assembly 1 is compressed, thereby achieving the function of sealing the gear cavity, and the programmable angle sensor 1.2 on the plastic cover plate assembly 1 and the magnet 10 fixed on the sector gear assembly 11 form an angle detection unit, which detects the opening and closing angle of the valve plate 16 in real time.

[0069] The sealing surface of the valve plate 16 is an outer inclined conical surface, and the sealing surface of the sealing valve seat 17 is an inner inclined conical surface, and the inner and outer conical surfaces form a sealing surface. Figure 4As shown, the three eccentric structures are as follows: the distance X between the metal shaft rotation center and the sealing surface is the first eccentricity, the distance Y between the metal shaft rotation center and the valve hole axis is the second eccentricity, and the rotation center line of the outer inclined conical surface of the valve plate 16 and the sealing valve seat 17 forms the third eccentricity with the valve hole axis at an angle alpha. The three eccentric parameter design of the utility model can ensure that the valve plate uniformly compresses the sealing valve seat 17 on the entire sealing surface. Based on the three eccentric principle design, the valve plate 16 only contacts the sealing valve seat 17 at the sealing position, and a greater sealing specific pressure is generated on the valve seat by the valve plate when passing through the valve. In addition, the sealing surface of the sealing valve seat 17 adopts a flexible lip design. In the case of positive pressure at the valve inlet or negative pressure at the outlet, the flexible lip will be tightly attached to the sealing surface of the valve plate 16 under the action of the pressure difference, and the sealing effect is better. When the valve plate 16 rotates out of the sealing position, the valve plate 16 is separated from the sealing valve seat 17. In the subsequent angle adjustment of the valve plate 16, the valve plate 16 is not in contact with the sealing valve seat 17 at all. Therefore, the three eccentric structure design of the utility model can realize that the valve plate 16 and the valve seat 17 only contact at the sealing position to generate zero leakage sealing, and sliding extrusion sealing is not required, the closing torque is extremely small, and in the fault mode, the pre-tightening force of the return spring 12 can make the valve plate return to the sealing position.

[0070] In the utility model, the valve seat inclined conical sealing surface is vulcanized on the valve seat sealing ring, and then the valve seat sealing ring is interference press-fitted on the valve body. The valve plate sealing surface forms an inclined conical sealing surface through metal insert injection molding. Another design scheme is that the valve seat inclined conical structure is injection molded on the valve body to form an integral whole with the valve body, and the surface of the metal valve plate is fully wrapped with a vulcanized rubber inclined conical sealing surface.

[0071] The utility model discloses a plastic shell cut-off valve specially used for air path cutting and air intake amount adjusting of fuel cell stack device, and has the following advantages relative to the current mainstream fuel cell air path cut-off valve.

[0072] The utility model has extremely low cut-off closing torque, and the valve plate can be closed to the complete cut-off position under the action of the pre-tightening torque of the set return spring to realize the sealing of the stack, solve the problem that the market double eccentric valve cannot be closed to the full closed position under the action of the spring return torque, leading to the sealing failure of the stack in the fault mode or when the motor is powered off.

[0073] The three eccentric structure design of the utility model realizes that the valve plate does not contact the rubber valve seat before entering the full closed position. After reaching the full closed position, the valve plate and the rubber valve seat are in a face compression relationship, without sliding friction. The valve plate and the rubber valve seat are separated at the moment when the valve plate rotates out of the full closed position. The valve plate entering and rotating out of the full closed position ensures that no sliding friction is generated between the valve plate and the rubber valve seat, solving the problem that the valve plate and the valve seat of the market double eccentric valve are in contact and wear, leading to sealing failure and jamming.

[0074] The utility model discloses a most ideal eccentric parameter and optimal rotary center position are obtained through the analytic method for eccentric geometric parameter optimization solution, compared with the market three eccentric valve using the design eccentric parameter (positive angle eccentric design rubber ring compression unevenness is poor) of drawing method, the valve plate is in the full closed position, realizes the even compression to rubber valve seat on the whole circumference of valve plate, and the sealing has no blind spot, and the sealing angle range is big, reduces the valve plate installation requirement.

[0075] The utility model discloses the geometric parameter of analytic method design is relative to the market drawing method design, and the radial eccentric parameter is more reasonable, and the deflection torque that the left and right two petals of valve plate produce under the admission pressure is small, and the motor load is reduced to avoid burning motor, and in the closed heap sealing position, the deflection torque that negative pressure produces combines the pre-tightening torque of return spring, and reliably guarantee that valve plate is pressed on rubber valve seat, and guarantee sealing performance.

[0076] The utility model discloses the shell design of high temperature -resistant, anti -hydrolysis and corrosion -resistant glass fiber reinforced polyaromatic amide plastic material, solves the valve body corrosion and ion precipitation problem.

[0077] The utility model discloses the valve plate adopts high temperature -resistant, anti -hydrolysis and corrosion -resistant self -lubricating plastic plastic metal insert design or adopts stainless steel processing design, and the valve plate sealing surface adopts self -lubricating material mirror surface design, greatly reduces the influence of the small angle slight friction of valve plate and rubber valve seat that assembly error brings.

[0078] The utility model discloses the rubber valve seat sealing surface adopts the flexible lip structure design, and the valve plate sealing area has good wrapping, can realize high reliability sealing, under the condition that the admission end normal pressure or the outlet end negative pressure, the differential pressure will tightly press the flexible lip in the valve plate sealing area, to guarantee the sealing reliability.

[0079] The utility model discloses the valve plate and metal axle connection adopt screw connection, compared with the product of laser welding on the market for guaranteeing the sealing performance of full closed position, and screw connection is reliable, and laser welding leads to the problem of weld corrosion and ion precipitation.

[0080] The utility model discloses the valve body metal axle both end support adopts three -lip sealed stainless steel needle bearing design, can satisfy the external leakage requirement in the product life cycle.

[0081] The utility model discloses the sealing ring inside contains metal framework, and it is the rubber full -wrap metal framework design, and the product on the market adopts the rubber part to wrap metal framework, and metal framework is installed with valve hole in excess, in the durability work, and the rubber ring has the risk of metal framework falling off failure, and the utility model discloses the design solves the rubber ring falling off problem.

[0082] The specific implementation scheme of the embodiment can be referred to the related description in the above embodiment, which will not be repeated here.

[0083] It can be understood that the same or similar parts in the above-mentioned embodiments can be mutually referenced, and the content not described in detail in some embodiments can refer to the same or similar content in other embodiments.

[0084] It should be noted that in the description of the utility model, the terms "first", "second" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance. In addition, in the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is at least two.

[0085] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The hydrogen fuel cell device air path cutoff valve device of the utility model adopts flexible lip sealing surface design scheme for rubber valve seat, and the zero leakage angle range of the valve plate and the valve seat at the sealing position is large, which greatly reduces the installation matching requirement of the valve plate and the valve seat, the screw installation is adopted for the installation of the valve plate and the metal shaft of the utility model, laser welding is not adopted, the sealing requirement can be met without special control, the problem of weld corrosion is completely solved, and the production line investment is reduced.

[0087] In this specification, the utility model has been described with reference to its specific embodiments. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the utility model. Therefore, the specification and drawings should be considered as illustrative rather than restrictive.

Claims

1. An air circuit shut-off valve device for a hydrogen fuel cell device, characterized in that, The device includes a plastic cover plate assembly, plastic cover plate screws, a metal shaft, a valve body, a motor assembly, an intermediate gear pin, an intermediate transmission gear, a sector gear assembly, a three-lip needle roller bearing, a C-ring, a valve plate, a sealing valve seat, and a retaining ring. The motor assembly and the intermediate gear pin are mounted on the valve body. The lower bearing hole of the valve body is press-fitted with a three-lip needle roller bearing. The C-ring is installed in a groove on the metal shaft, and the metal shaft is axially limited by the C-ring. The valve plate is fixed on the metal shaft. The sealing valve seat is press-fitted onto the valve body, and the sealing valve seat is press-fitted with the valve body radially and axially. The retaining ring is press-fitted into a corresponding hole in the valve body. The sector gear assembly is located at the mechanical bottom dead center position on the valve body, and the valve plate is also in a sealing position with the sealing valve seat. The intermediate transmission gear meshes with the motor assembly and also meshes with the sector gear assembly. The plastic cover plate assembly is mounted to the valve body using cover plate screws.

2. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The three-lip needle roller bearing is fitted onto the upper end of the metal shaft. The three-lip needle roller bearing and the C-type retaining ring are installed together into the bearing hole of the valve body. The three-lip needle roller bearing is pressed into the upper bearing hole of the valve body. The three-lip needle roller bearing squeezes the C-type retaining ring onto the bottom surface of the three-lip needle roller bearing and the bottom surface of the bearing hole of the valve body.

3. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The sealing surface of the valve plate is an externally inclined conical surface, and the sealing surface of the sealing valve seat is an internally inclined conical surface. The externally inclined conical surface and the internal conical surface cooperate to form a sealing surface. The valve plate only contacts the sealing valve seat at the sealing position.

4. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The sealing valve seat is provided with a semi-circular protrusion, and the valve body is provided with a semi-circular groove. The semi-circular groove of the valve body and the semi-circular protrusion of the sealing valve seat cooperate with each other. The valve plate is provided with a threaded hole, and the valve plate is fixed to the metal shaft by valve plate screws.

5. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The device also includes a return spring, one end of which is hooked to the column of the sector gear assembly, and the other end to the column of the valve body. By rotating the sector gear assembly, a preload torque is applied to the return spring, which is then inserted into the valve body until the hole of the insert on the sector gear assembly mates with the mating shaft section of the metal shaft. The sector-shaped end face of the sector gear assembly contacts the mechanical bottom dead center limiting surface on the valve body, and the sector gear assembly is in the mechanical bottom dead center position. The valve plate is completely fitted with the sealing valve seat, and the sector gear assembly is welded to the metal shaft. The fully closed position of the valve plate is fixedly connected to the mechanical bottom dead center position of the sector gear assembly on the valve body.

6. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The device also includes a magnet fixed to the sector gear assembly, an intermediate transmission gear located on an intermediate gear pin, a large gear of the intermediate transmission gear meshing with a motor gear of the motor assembly, and a small gear of the intermediate transmission gear meshing with the sector gear assembly.

7. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The plastic cover assembly includes a sealing ring and a programmable angle sensor. The sealing ring is compressed to form a sealed gear cavity. The programmable angle sensor and the magnet fixed to the sector gear assembly form an angle detection unit.

8. The air circuit shut-off valve device for a hydrogen fuel cell device according to claim 1, characterized in that, The sealing surface of the valve seat is a flexible lip. Under positive pressure at the valve inlet or negative pressure at the outlet, the sealing surface of the flexible lip of the valve seat adheres tightly to the sealing surface of the valve plate under the action of pressure difference.

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