阅读说明：本技术 一种压力均衡的防塌腰燃料电池 (Pressure-balanced anti-waist-collapse fuel cell ) 是由 宋书范 龚靖 刘建飞 于 2020-09-07 设计创作，主要内容包括：本发明公开了一种压力均衡的防塌腰燃料电池,涉及燃料电池技术领域,包括两个端板、两个绝缘层和若干个电池单元,两个端板之间的上部和下部均设有两个固定杆,两个端板之间设有两个调节机构,每个调节机构均包括承托组件和压力调节组件,承托组件和压力调节组件相配合,每个端板的内部均设有挤压组件,两个端板之间设有若干个用于捆扎两者的钢带。本发明通过两个承托组件和两个压力调节组件以及两个挤压组件的配合,既能够防止电池单元出现塌腰的情况,也能使相邻的两个电池单元之间的封装压力更加均匀,提高电堆的效率、可靠性和适用寿命。(The invention discloses a pressure-balanced waist collapse prevention fuel cell, which relates to the technical field of fuel cells and comprises two end plates, two insulating layers and a plurality of cell units, wherein two fixing rods are arranged at the upper part and the lower part between the two end plates, two adjusting mechanisms are arranged between the two end plates, each adjusting mechanism comprises a bearing component and a pressure adjusting component, the bearing component is matched with the pressure adjusting component, an extrusion component is arranged in each end plate, and a plurality of steel belts for binding the two end plates are arranged between the two end plates. According to the invention, through the matching of the two bearing assemblies, the two pressure adjusting assemblies and the two extrusion assemblies, the waist collapse of the battery units can be prevented, the packaging pressure between two adjacent battery units can be more uniform, the efficiency and the reliability of the galvanic pile are improved, and the service life of the galvanic pile is prolonged.)

1. The utility model provides a balanced waist fuel cell that prevents collapsing of pressure, includes battery cell (3) that two end plates (1), two insulating layers (2) and a plurality of arranged in proper order, and two insulating layers (2) set up the side at battery cell (3) at both ends respectively, and two end plates (1) set up the side at two insulating layers (2) respectively, its characterized in that: two upper portion and lower part between end plate (1) all are equipped with two dead lever (4), every the tip of dead lever (4) all passes through bolt fixed connection with end plate (1), are equipped with adjustment mechanism (5) that two symmetries set up between two end plate (1), all battery unit (3) all are located between two adjustment mechanism (5) and the both sides of every battery unit (3) all cooperate with adjustment mechanism (5) that correspond, every adjustment mechanism (5) all include bearing subassembly (51) and pressure regulating assembly (52), bearing subassembly (51) and pressure regulating assembly (52) cooperate, every the inside of end plate (1) all is equipped with extrusion subassembly (6), two be equipped with a plurality of between end plate (1) and be used for tying up steel band (7) between them.

2. A pressure equalized, collapse-resistant fuel cell according to claim 1, wherein: every bearing subassembly (51) is including bearing bracket (511), two bearing guide arms (512), two sliding tray (513), bearing block (514) and bearing block (515) down on a plurality of, bearing block (514) and a plurality of battery cell (3) one-to-one and fixed connection on a plurality of, every the cross section of going up bearing block (514) all is the isosceles trapezoid of invering, and bearing block (515) are installed under a plurality of in one side of bearing bracket (511) and all bearing block (515) and all last bearing block (514) crisscross settings, every the cross section of bearing block (515) down all is the isosceles trapezoid of just putting, and the base angle of going up bearing block (514) and bearing block (515) down is the same, every the upper and lower both ends of bearing block (515) down all are equipped with bearing guide arm (512) sliding fit's sliding block (516), and the one side that every two adjacent (516) are equipped with piston rod (517) respectively and piston rod (517) sliding fit with piston rod (517) sliding fit The piston groove (518).

3. A pressure equalized, collapse-resistant fuel cell according to claim 2, wherein: the pressure adjusting component (52) comprises a driving block (521), a plurality of connecting hoses (522), a plurality of adjusting grooves and a plurality of adjusting piston rods (524), all the adjusting grooves are arranged in the driving block (521), the connecting hoses (522) are respectively communicated with the piston grooves (518) in a one-to-one correspondence manner, each connecting hose (522) is communicated with the corresponding adjusting groove, a plurality of adjusting piston rods (524) are respectively in one-to-one correspondence and sliding fit with a plurality of adjusting grooves, a driving cavity (525) communicated with all the adjusting grooves is arranged in the driving block (521), a driving sliding block (527) in sliding fit with the driving cavity (525) is arranged in the driving cavity (525), one end of each adjusting piston rod (524) is fixedly connected with the driving sliding block (527), one side of the driving block (521) is provided with an adjusting push rod (526), and the output end of the adjusting push rod (526) is fixedly connected with one side of the driving slide block (527).

4. A pressure equalized, collapse-resistant fuel cell according to claim 1, wherein: every extrusion subassembly (6) all include extrusion groove (61), extrusion piece (62), a plurality of power groove, a plurality of power ejector pad (64) and hydraulic pressure chamber (65), extrusion groove (61) set up the one side at end plate (1), extrusion piece (62) are located extrusion groove (61) and sliding fit between the two, the power groove is located end plate (1) and all power grooves all communicate with extrusion groove (61), a plurality of power ejector pad (64) and a plurality of power groove one-to-one and sliding fit, hydraulic pressure chamber (65) set up in end plate (1) and all extrusion grooves (61) all communicate with hydraulic pressure chamber (65), the outside of end plate (1) is equipped with hydraulic pressure pipe (66) with hydraulic pressure chamber (65) intercommunication.

5. A pressure equalized, collapse-resistant fuel cell according to claim 1, wherein: each one side of end plate (1) all is equipped with a plurality of rather than fixed connection semicircle piece (8), a plurality of semicircle piece (8) and a plurality of steel band (7) one-to-one.

6. A pressure equalized collapse-proof fuel cell according to claim 5, wherein: and a clamping groove matched with the steel belt (7) is formed in the side wall of each semicircular block (8).

7. A pressure equalized, collapse-resistant fuel cell according to claim 1, wherein: and a pressure sensor (9) is arranged in each extrusion groove (61).

Technical Field

The invention relates to the technical field of fuel cells, in particular to a pressure-balanced waist collapse prevention fuel cell.

Background

The fuel cell is a commonly used energy device, and the interior of the fuel cell is sequentially connected by a plurality of cell units, so that the conditions of waist collapse or downwarping and the like often occur after the fuel cell is used for a long time.

Chinese patent No. CN210723242U discloses a fuel cell, comprising: the galvanic pile comprises an upper end plate, a lower end plate and a plurality of layers of bipolar plates; the connecting bodies comprise upper connecting bodies and lower connecting bodies; the supporting bodies correspond to the connecting bodies one to one, and the two ends of each supporting body are clamped with the connecting bodies along the X-axis direction. The utility model has the advantages that: the cooperation of connector and supporter improves the shock resistance of whole battery, avoids the battery to take place to collapse the waist.

However, the above patent still has the following disadvantages that the bipolar plate is supported only by the connectors and the supporting bodies on the two sides when the bipolar plate is used, if the connectors and the supporting bodies are too few, the connectors and the supporting bodies themselves may be collapsed after long-time use, and further the effect is not good, and if the connectors and the supporting bodies are too many, the heat dissipation is not good when the fuel cell is used, and the use of the fuel cell is affected. In addition, above-mentioned patent equipment can't adjust the packaging pressure between the adjacent bipolar plate when using, and then can't guarantee that the packaging pressure is even between the bipolar plate, and this can make fuel cell's resistance, thermal resistance and mass transfer resistance inhomogeneous, and then influence the efficiency, the reliability and the life of being suitable for of pile.

Disclosure of Invention

The invention aims to provide a pressure-balanced waist collapse prevention fuel cell, which aims to solve the technical problems that a galvanic pile is easy to collapse and packaging pressure is uneven and cannot be adjusted in the prior art.

The invention provides a pressure-balanced waist collapse prevention fuel cell, which comprises two end plates, two insulating layers and a plurality of cell units which are sequentially arranged, wherein the two insulating layers are respectively arranged at the sides of the cell units at two ends, the two end plates are respectively arranged at the sides of the two insulating layers, two fixing rods are respectively arranged at the upper part and the lower part between the two end plates, the end part of each fixing rod is fixedly connected with the end plates through bolts, two symmetrically-arranged adjusting mechanisms are arranged between the two end plates, all the cell units are positioned between the two adjusting mechanisms, the two sides of each cell unit are matched with the corresponding adjusting mechanisms, each adjusting mechanism comprises a bearing component and a pressure adjusting component, the bearing component is matched with the pressure regulating component, each extrusion component is arranged in each end plate, and a plurality of steel belts used for bundling the bearing component and the pressure regulating component are arranged between the two end plates.

Further, every the bearing subassembly includes bearing bracket, two bearing guide arms, two sliding tray, bearing block and a plurality of lower bearing block on a plurality of, bearing block and a plurality of battery unit one-to-one and fixed connection, every on a plurality of the cross section of going up the bearing block all is the isosceles trapezoid of invering, and bearing block installs in one side of bearing bracket and all down bearing block and all go up bearing block crisscross setting, every under a plurality of the cross section of bearing block all is the isosceles trapezoid of just putting, and goes up the bearing block and the base angle of bearing block down the same, every the upper and lower both ends of bearing block down all are equipped with the sliding block with bearing guide arm sliding fit, and every two adjacent one sides of every adjacent are equipped with the piston rod respectively and with piston rod sliding fit's piston groove.

Further, the pressure regulating assembly includes drive block, a plurality of coupling hose, a plurality of adjustment tank and a plurality of adjusting piston rod, all the adjustment tank all sets up in the drive block, a plurality of coupling hose respectively with a plurality of piston groove one-to-one intercommunication, and every coupling hose all with rather than the adjustment tank intercommunication that corresponds, a plurality of adjusting piston rod respectively with a plurality of adjustment tank one-to-one and sliding fit, be equipped with the drive chamber with all adjustment tank intercommunications in the drive block, the drive intracavity is equipped with rather than sliding fit's drive slider and all adjusting piston rod's one end all with drive slider fixed connection, one side of drive block is equipped with the adjusting push rod, the output of adjusting push rod and one side fixed connection of drive slider.

Further, every the extrusion subassembly all includes extrusion groove, extrusion piece, a plurality of power groove, a plurality of power ejector pad and hydraulic pressure chamber, the extrusion groove sets up the one side at the end plate, the extrusion piece is located the extrusion inslot and between the two sliding fit, the power groove is located the end plate and all power grooves all communicate with the extrusion groove, a plurality of power ejector pad and a plurality of power groove one-to-one and sliding fit, the hydraulic pressure chamber sets up in the end plate and all extrusion grooves all communicate with the hydraulic pressure chamber, the outside of end plate is equipped with the hydraulic pressure pipe with hydraulic pressure chamber intercommunication.

Furthermore, each one side of end plate all is equipped with a plurality of rather than fixed connection semicircle piece, a plurality of semicircle piece and a plurality of steel band one-to-one.

Furthermore, a clamping groove matched with the steel belt is formed in the side wall of each semicircular block.

Furthermore, a pressure sensor is arranged in each extrusion groove.

Compared with the prior art, the invention has the beneficial effects that:

first, the upper bearing blocks and the lower bearing blocks are arranged in a staggered mode, a clamping groove with a large upper opening and a small lower opening is formed between every two adjacent lower bearing blocks and is just clamped with the upper bearing blocks, when the battery unit and the upper bearing blocks have a waist collapse trend of moving downwards, the clamping groove between the two lower bearing blocks is reduced downwards, and therefore the upper bearing blocks can be clamped to prevent the upper bearing blocks from moving downwards, and the effect of preventing the battery unit from collapsing is achieved.

And secondly, the driving sliding block is pushed to move by the adjusting push rod, the driving sliding block pushes all the adjusting piston rods to move together, the adjusting piston rods pushing the extrusion liquid to extrude the corresponding adjusting piston rods to move when the adjusting piston rods move, and then the distance between two adjacent lower bearing blocks is adjusted, and the pressure between two adjacent battery units is changed by the extrusion between the lower bearing blocks and the upper bearing blocks, so that the packaging pressure change of the battery units caused by the working state can be adjusted in the using process, the packaging pressure between two adjacent battery units is always kept at the optimal value, and further the resistance, the thermal resistance and the mass transfer resistance of the fuel cell are in the optimal state, the efficiency, the reliability and the service life of the electric pile are improved.

Thirdly, the distance between the end plates at two ends in the prior art can not be changed, when the pressure adjusting assembly works to adjust the packaging pressure between two adjacent battery units, the pressure between the end plates at two ends and the corresponding insulating layers is too small or too large, the using effect of the fuel cell can be influenced by the conditions, therefore, when the pressure adjusting assembly is adjusted, the corresponding hydraulic driving device is connected through a hydraulic pipe, and then the extrusion block is pushed to move in the extrusion groove, so that the pressure between the extrusion block and the corresponding insulating layers is changed, the pressure adjusting assembly is matched to work, and the effect of packaging pressure adjustment between the battery units is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a partial exploded view of the present invention;

FIG. 5 is a partial exploded view of the present invention;

FIG. 6 is a partial cross-sectional view of the first embodiment of the present invention;

fig. 7 is a partial sectional view of the second embodiment of the present invention.

Reference numerals:

the device comprises an end plate 1, an insulating layer 2, a battery unit 3, a fixing rod 4, an adjusting mechanism 5, a supporting component 51, a supporting bracket 511, a supporting guide rod 512, a sliding groove 513, an upper supporting block 514, a lower supporting block 515, a sliding block 516, a piston rod 517, a piston groove 518, a pressure adjusting component 52, a driving block 521, a connecting hose 522, an adjusting piston rod 524, a driving cavity 525, an adjusting push rod 526, a driving sliding block 527, an extruding component 6, an extruding groove 61, an extruding block 62, a power pushing block 64, a hydraulic cavity 65, a hydraulic pipe 66, a steel belt 7, a semicircular block 8 and a pressure sensor 9.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 7, an embodiment of the present invention provides a pressure-balanced waist collapse prevention fuel cell, including two end plates 1, two insulating layers 2 and a plurality of battery units 3 arranged in sequence, where the two insulating layers 2 are respectively disposed at sides of the battery units 3 at two ends, the two end plates 1 are respectively disposed at sides of the two insulating layers 2, two fixing rods 4 are respectively disposed at upper and lower portions between the two end plates 1, an end portion of each fixing rod 4 is fixedly connected to the end plate 1 through a bolt, two symmetrically-disposed adjusting mechanisms 5 are disposed between the two end plates 1, all the battery units 3 are located between the two adjusting mechanisms 5, two sides of each battery unit 3 are respectively matched with the corresponding adjusting mechanisms 5, each adjusting mechanism 5 includes a supporting component 51 and a pressure adjusting component 52, the supporting component 51 is matched with the pressure adjusting component 52, an extrusion assembly 6 is arranged inside each end plate 1, and a plurality of steel belts 7 for bundling the two end plates 1 are arranged between the two end plates 1; when the fuel cell stack is in operation, all the cell units 3 can be supported by the two supporting assemblies 51, the situation that the waist of the packaged part of the cell units 3 collapses after long-time use is prevented, the packaging pressure between two adjacent cell units 3 can be adjusted by the arrangement of the two pressure adjusting assemblies 52 and the two squeezing assemblies 6 in a mutually matched mode, the packaging pressure is more uniform, the situations of poor resistance, thermal resistance and mass transfer resistance of the fuel cell caused by uneven packaging pressure are avoided, and the efficiency, reliability and service life of the fuel cell stack are improved.

Specifically, each supporting assembly 51 comprises a supporting bracket 511, two supporting guide rods 512, two sliding grooves 513, a plurality of upper supporting blocks 514 and a plurality of lower supporting blocks 515, the plurality of upper supporting blocks 514 correspond to and are fixedly connected with the plurality of battery units 3 one by one, the cross section of each upper supporting block 514 is in an inverted isosceles trapezoid shape, the plurality of lower supporting blocks 515 are installed on one side of the supporting bracket 511, all the lower supporting blocks 515 and all the upper supporting blocks 514 are arranged in a staggered manner, the cross section of each lower supporting block 515 is in a right isosceles trapezoid shape, the bottom angles of the upper supporting block 514 and the lower supporting block 515 are the same, sliding blocks 516 in sliding fit with the supporting guide rods 512 are arranged at the upper end and the lower end of each lower supporting block 515, and a piston rod 517 and a piston groove 518 in sliding fit with the piston rod 517 are arranged on one side adjacent to each two sliding blocks 516; wherein, that bearing block 515 under the most middle among all lower bearing blocks 515 is with supporting bracket 511 fixed connection, through the crisscross setting each other of last bearing block 514 and lower bearing block 515, form the draw-in groove that the big end opening of a mouth is little down between every two adjacent lower bearing blocks 515, and just block with last bearing block 514, when the waist trend that collapses of downward movement appears in battery unit 3 and last bearing block 514, the draw-in groove between two lower bearing blocks 515 diminishes downwards, consequently, can block last bearing block 514, prevent its downstream, thereby can play the effect that prevents the battery unit 3 condition that the waist collapsed.

Specifically, the pressure adjusting assembly 52 includes a driving block 521, a plurality of connecting hoses 522, a plurality of adjusting grooves and a plurality of adjusting piston rods 524, all the adjusting grooves are disposed in the driving block 521, the plurality of connecting hoses 522 are respectively communicated with the plurality of piston grooves 518 in a one-to-one correspondence, each connecting hose 522 is communicated with the corresponding adjusting groove, the plurality of adjusting piston rods 524 are respectively communicated with the plurality of adjusting grooves in a one-to-one correspondence and in a sliding fit, a driving cavity 525 communicated with all the adjusting grooves is disposed in the driving block 521, a driving slider 527 in a sliding fit with the driving cavity 525 is disposed in the driving cavity 525, one end of each adjusting piston rod 524 is fixedly connected with the driving slider 527, an adjusting push rod 526 is disposed on one side of the driving block 521, and an output end of the adjusting push rod 526 is fixedly connected with one side of the driving slider 527; wherein, the adjusting push rod 526 can be an electric push rod or a hydraulic rod, and the space between the adjusting piston rod 524 and the piston rod 517 is filled with extrusion liquid, because the piston slot 518 is communicated with the adjusting slot through the connection hose 522, when the adjusting piston rod 524 moves in the adjusting slot, the pressure is conducted through hydraulic pressure, so that the piston rod 517 moves in the piston slot 518, when in operation, the driving slider 527 is pushed to move through the adjusting push rod 526, the driving slider 527 pushes all the adjusting piston rods 524 to move together, when the adjusting piston rod 524 moves, the extrusion liquid is pushed to extrude the corresponding piston rod 517 to move, because the middle lower support block 515 is fixed on the support bracket 511, the lower support blocks 515 on both sides move to both sides, because the amount of extrusion liquid between all the adjusting piston rods 524 and the piston rods 517 is equal and all the adjusting piston rods 524 move synchronously and equidistantly, this will make the distance between two adjacent lower support blocks 515 equal, and then make the pressure between two adjacent battery units equal, when pushing the adjusting piston rod 524, will make all the hydraulic pressure increase in the piston slot 518, make the adjacent lower support block 515 keep away from, drive the distance between adjacent battery units 3 to increase, thus reduce the pressure between battery units 3, otherwise, when pulling the adjusting piston rod 524 outward, will make the distance between adjacent lower support blocks 515 reduce, drive the distance between adjacent battery units 3 to reduce, make the pressure between battery units 3 increase, through adjusting the distance between two adjacent lower support blocks 515, and the press fit between lower support block 515 and upper support block 514, change the pressure between two adjacent battery units 3, thus can adjust the packaging pressure change of battery units 3 caused by the operating condition during the use, the packaging pressure between two adjacent battery units 3 is always kept at the optimal value, so that the resistance, the thermal resistance and the mass transfer resistance of the fuel cell are in the optimal state, the efficiency and the reliability of the electric pile are improved, and the service life of the electric pile is prolonged. In addition, two symmetrically disposed connection hoses 522 of two pressure adjustment assemblies 52 can be communicated with each other, so that two pressure adjustment assemblies 52 can be driven simultaneously by using one adjustment push rod 526, but such an arrangement would cause the arrangement of the connection hoses 522 to be disordered, is inconvenient to install, and can be specifically set according to the actual use environment.

Specifically, each extrusion assembly 6 comprises an extrusion groove 61, an extrusion block 62, a plurality of power grooves, a plurality of power push blocks 64 and a hydraulic cavity 65, the extrusion groove 61 is arranged on one side of the end plate 1, the extrusion block 62 is positioned in the extrusion groove 61 and is in sliding fit with the extrusion groove 61, the power grooves are positioned in the end plate 1, all the power grooves are communicated with the extrusion groove 61, the plurality of power push blocks 64 are in one-to-one correspondence with the plurality of power grooves and are in sliding fit with the power grooves, the hydraulic cavity 65 is arranged in the end plate 1, all the extrusion grooves 61 are communicated with the hydraulic cavity 65, and a hydraulic pipe 66 communicated with the hydraulic cavity 65 is arranged on the outer side of the end plate 1; in the prior art, the distance between the end plates 1 at the two ends cannot be changed, when the pressure adjusting assembly 52 works to adjust the sealing pressure between two adjacent battery units 3, the pressure between the end plates 1 at the two ends and the corresponding insulating layer 2 is too small or too large, which affects the use effect of the fuel cell, therefore, when the pressure adjusting assembly 52 works, the corresponding hydraulic driving device is connected through the hydraulic pipe 66, and the extrusion block 62 is further pushed to move in the extrusion groove 61, so as to change the pressure between the extrusion block 62 and the corresponding insulating layer 2, and the pressure adjusting assembly 52 works in cooperation, thereby improving the effect of adjusting the sealing pressure between the battery units 3.

Specifically, one side of each end plate 1 is provided with a plurality of semicircular blocks 8 fixedly connected with the end plate, and the semicircular blocks 8 correspond to the steel belts 7 one by one; both can set up semicircle piece 8 in one side of end plate 1, also can be the semicircle column with the whole setting in one side of end plate 1, can set up according to actual conditions, and semicircle piece 8's setting is compared with the end plate 1 of rectangle among the prior art, can make steel band 7 more stable to being connected between two end plates 1, and the excessive condition of rectangle turning and the wearing and tearing of steel band 7 can not appear and take place.

Specifically, a clamping groove matched with the steel belt 7 is formed in the side wall of each semicircular block 8; the clamping groove is used for limiting the position of the steel belt 7.

Specifically, each extrusion groove 61 is provided with a pressure sensor 9 for detecting internal pressure, so that the extrusion assembly 6 can be adjusted in time, the resistance, thermal resistance and mass transfer resistance of the fuel cell are in the best state, and the efficiency, reliability and service life of the stack are improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.