阅读说明：本技术 一种开关结构及花洒枪 (Switch structure and shower gun ) 是由 陈浩 于 2021-09-26 设计创作，主要内容包括：本发明涉及开关技术领域,公开了开关结构,包括有管腔、设置在管腔侧壁上的进水口与出水口、设置在管腔内并密封管腔的开关轴,开关轴相对于管腔沿轴向可移动设置,进水口与出水口至少一者设置在开关轴的移动路径上,以实现进水口和出水口的通断。本发明提供的开关结构,通过同一个结构部件及同一种开关操作既能进行管路开闭也能调节开闭大小,简便操作,简化结构,一定程度降低了生产成本,且使得密封易于实现,保证良好的密封效果。(The invention relates to the technical field of switches, and discloses a switch structure which comprises a pipe cavity, a water inlet and a water outlet which are arranged on the side wall of the pipe cavity, and a switch shaft which is arranged in the pipe cavity and seals the pipe cavity, wherein the switch shaft is axially movably arranged relative to the pipe cavity, and at least one of the water inlet and the water outlet is arranged on a moving path of the switch shaft so as to realize the connection and disconnection of the water inlet and the water outlet. According to the switch structure provided by the invention, the pipeline can be opened and closed and the opening and closing size can be adjusted through the same structural component and the same switch operation, so that the operation is simple and convenient, the structure is simplified, the production cost is reduced to a certain extent, the sealing is easy to realize, and the good sealing effect is ensured.)

1. The switch structure is characterized by comprising a pipe cavity, a water inlet (2) and a water outlet (1) which are arranged on the side wall of the pipe cavity, and a switch shaft (3) which is arranged in the pipe cavity and seals the pipe cavity, wherein the switch shaft (3) can be axially and movably arranged relative to the pipe cavity, and at least one of the water inlet (2) and the water outlet (2) is arranged on a moving path of the switch shaft (3) so as to realize the on-off of the water inlet (2) and the water outlet (1).

2. The switching structure according to claim 1, characterized in that a spiral track (9) for displacement of the switching shaft (3) is arranged in the tube cavity, and the switching shaft (3) is rotatably clamped on the spiral track (9).

3. The switch structure according to claim 2, characterized in that the switch structure further comprises a first shaft seat (5) for sealing an end of the tube cavity and a clamping plug (4) fixedly connected with the first shaft seat (5) and located in the tube cavity, the first shaft seat (5) is rotatably arranged relative to the tube cavity, and the switch shaft (3) is connected with the clamping plug (4) in a clamping manner, rotates with the first shaft seat (5) and is axially slidably arranged relative to the clamping plug (4).

4. The switch structure according to claim 2, characterized in that the switch shaft (3) comprises a main shaft section (33), a sealing shaft section (32) and a shaft end section (31) which are sequentially connected, the sealing shaft section (32) is provided with a sealing element for sealing the pipe cavity, the shaft end section (31) has a diameter smaller than that of the sealing shaft section (32) and is located on the side of the sealing shaft section (32) close to the water outlet (1), the main shaft section (33) has a diameter larger than that of the sealing shaft section (32) and is located on the side of the sealing shaft section (32) close to the water inlet (2), the main shaft section (33) is provided with a groove which extends in a spiral shape, and the spiral track (9) is convex.

5. A switch structure according to claim 3, characterized in that it further comprises a limit structure for limiting the end point of rotation of said switch shaft (3).

6. The switch structure according to claim 5, characterized in that the limit structure comprises a limit bump (16) arranged on the switch shaft (3) or shaft seat and a limit stop (17) arranged on the inner wall of the tube cavity, the limit stop (17) being in the rotation path of the limit bump (16).

7. A shower gun comprising a spray head, a barrel and a switch structure according to any one of claims 1 to 6, said switch structure being disposed within said barrel.

8. The spray gun of claim 7 wherein said spray head includes N spray nozzles in communication with said barrel, wherein N is a positive integer greater than one, and wherein said spray nozzles have progressively increasing water discharge areas.

9. The shower gun according to claim 8, wherein the nozzle comprises a water outlet plug (15) arranged in the gun barrel, a cap (13) rotatably connected with the gun barrel and a water outlet net (14) covering the cap end of the cap (13), N nozzles are fixed on the cap end of the cap (13), the water outlet end of the nozzle with the largest opening diameter is positioned inside the water outlet net (14) and communicated with the water outlet net (14), the water outlet ends of the other nozzles pass through the water outlet net (14) and are positioned outside the water outlet net (14), a water guide opening (151) for water to flow out is arranged on the water outlet plug (15), and the water inlet end of each nozzle is distributed along the circumferential direction and is positioned on the relative rotation path of the water guide opening (151).

10. The lance defined in claim 9 further includes a separate locating formation for angularly locating the spigot (15).

Technical Field

The invention relates to the technical field of switches, in particular to a switch structure and a shower gun.

Background

In a waterway product, such as a shower gun or a faucet, two types of switch structures are usually provided, one is a switch structure for closing or opening a pipeline, and the other is a switch structure for adjusting the opening and closing size, i.e., the size of water flow, for example, a handle of the faucet is lifted or pressed down to open or close the water flow, and the handle is rotated to adjust the size of the water flow. The switch has the disadvantages of complex structure, more parts and higher production cost.

Disclosure of Invention

The invention aims to provide a switch structure, which can be used for opening and closing a pipeline and adjusting the size of the opening and closing through the same structural component and the same switch operation, is simple and convenient to operate, simplifies the structure, reduces the production cost to a certain extent, ensures that the sealing is easy to realize, and ensures a good sealing effect. The invention also aims to provide the shower gun comprising the switch structure.

In order to achieve the above object, the switch structure provided by the present invention includes a tube cavity, a water inlet and a water outlet disposed on a side wall of the tube cavity, and a switch shaft disposed in the tube cavity and sealing the tube cavity, wherein the switch shaft is axially movably disposed relative to the tube cavity, and at least one of the water inlet and the water outlet is disposed on a moving path of the switch shaft, so as to enable the water inlet and the water outlet to be connected or disconnected.

Preferably, a spiral track for allowing the switch shaft to move is arranged in the tube cavity, and the switch shaft is rotatably clamped on the spiral track.

Preferably, the switch structure further includes a first shaft seat for sealing an end of the tube cavity and a clamping plug fixedly connected with the first shaft seat and located in the tube cavity, the first shaft seat is rotatably disposed with respect to the tube cavity, and the switch shaft is connected with the clamping plug in a clamping manner, rotates with the first shaft seat and is axially slidably disposed with respect to the clamping plug.

Preferably, along the axial the switch axle is including the main shaft section, sealed shaft section and the shaft end section that connect gradually, be provided with on the sealed shaft section and be used for sealing the sealing member of lumen, the diameter of shaft end section is less than sealed shaft section, and be located sealed shaft section is close to one side of delivery port, the diameter of main shaft section is greater than sealed shaft section, and be located sealed shaft section is close to one side of water inlet, be provided with the recess that is the heliciform extension on the main shaft section, the spiral track is the bulge.

Preferably, the switch further comprises a limiting structure for limiting the rotation end point of the switch shaft.

Preferably, the limit structure comprises a limit bump arranged on the switch shaft or the shaft seat and a limit stop arranged on the inner wall of the tube cavity, and the limit stop is positioned on a rotation path of the limit bump.

The invention also provides a shower gun, which comprises a spray head, a gun barrel and the switch structure, wherein the switch structure is arranged in the gun barrel.

Preferably, the spray head comprises N nozzles respectively communicated with the gun barrel, wherein N is a positive integer greater than one, and the area of the water spray opening of each nozzle is gradually increased.

Preferably, the spray head comprises a water outlet plug arranged in the gun tube, a cap rotatably connected with the gun tube and a water outlet net covered on the cap end of the cap, the N nozzles are all fixed on the cap end of the cap, the water outlet end of the nozzle with the largest opening diameter is positioned on the inner side of the water outlet net and communicated with the water outlet net, the water outlet ends of the other nozzles penetrate through the water outlet net and positioned on the outer side of the water outlet net, a water guide port for water to flow out of the water outlet plug is eccentrically arranged, and the water inlet end of each nozzle is circumferentially distributed and positioned on a relative rotation path of the water guide port.

Preferably, the water outlet device further comprises a separation positioning structure for positioning the rotation angle of the water outlet plug.

The technical scheme provided by the application can comprise the following beneficial effects: according to the technical scheme provided by the invention, the water inlet and the water outlet are axially distributed along the tube cavity, the sealing shaft section of the sealing tube cavity is axially movably arranged relative to the tube cavity, and the water inlet or the water outlet can be opened and closed according to different positions of the sealing shaft section in the axial direction of the tube cavity, the opening and closing degree of the water inlet can be adjusted, and the size of water flow is adjusted; meanwhile, the movement of moving the shaft section can carry out management and control adjustment in two aspects, and the use and operation are also simple and convenient.

The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a first angled cross-sectional view of a switch structure in an embodiment of the invention;

FIG. 2 is a second angular cross-sectional view of a switch structure in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a switch structure according to an embodiment of the present invention;

FIG. 4 is a schematic view of a handle in an embodiment of the present invention;

FIG. 5 is a schematic view of a limiting structure according to an embodiment of the present invention;

FIG. 6 is an external view of the shower gun according to the embodiment of the present invention;

FIG. 7 is a schematic view of a showerhead according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a separation positioning structure in an embodiment of the invention.

In fig. 1-8:

1. a water outlet; 2. a water inlet; 3. a switch shaft; 31. a shaft end section; 32. sealing the shaft section; 33. a main shaft section; 4. clamping a plug; 5. a first shaft seat; 6. a second shaft base; 7. a mandrel; 8. a clamping cap; 9. a spiral track; 10. a handle; 11. a water spray pipe; 12. a hand-held tube; 13. capping; 131. positioning the concave points; 14. a water outlet net; 15. a water outlet plug; 151. a water guide port; 152. fixing the pipe column; 16. a limiting bump; 17. and a limit stop.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The purpose of this embodiment is to provide a switch structure, can carry out the pipeline switching through same structural component and same kind of switch operation and also can adjust the switching size, simple and convenient operation simplifies the structure, and certain degree has reduced manufacturing cost, and makes sealed easily realize, guarantees good sealed effect.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the invention recited in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1-8, the switch structure provided in this embodiment includes a tube cavity, a water inlet 2 and a water outlet 1 disposed on a side wall of the tube cavity, and a switch shaft 3 disposed in the tube cavity, wherein the water inlet 2 and the water outlet 1 are distributed in the tube cavity, and the switch shaft 3 can seal the tube cavity and is axially movably disposed in the tube cavity, that is, the switch shaft 3 can axially displace in the tube cavity. At least one of the water inlet 2 and the water outlet 1 is arranged on the moving path of the switch shaft 3, such as one is arranged on the axial side wall of the tube cavity or at least a part of the opening is arranged on the axial side wall of the tube cavity, and the other one can be arranged on the axial side wall or the tube wall of the end part. When the switch shaft 3 is displaced in the pipe cavity to the state that the water inlet 2 and the water outlet 1 are not shielded, the water inlet 2 is communicated with the water outlet 1, the water inlet 2 is completely opened, and the water flow is maximum; when the switch shaft 3 is displaced to partially shield the water inlet 2 or the water outlet 1, the water flow is reduced; when the switch shaft 3 completely shields the water inlet 2, or is positioned between the water inlet 2 and the water outlet 1, or completely shields the water outlet 1, the flow can be blocked, and the water flow switch is closed. With such an arrangement, in the switch structure provided by the embodiment, the switch shaft 3 moves axially in the tube cavity, so that the water inlet 2 or the water outlet 1 can be opened and closed, the opening and closing degree of the water gap can be adjusted, and the water flow size can be adjusted, compared with a water path switch in which the opening and closing size is adjusted by rotating the opening and closing pipeline in the prior art, such as a water tap and the like, one switch structure can be used for opening and closing the pipeline and adjusting the water flow size, so that the structure is simplified, the production cost is reduced to a certain extent, and the pipeline can be sealed only by sealing one position, such as the position between the switch shaft 3 and the tube cavity, so that the sealing is easy to realize, and a good sealing effect is ensured; meanwhile, the switch shaft 3 is moved, so that management and control adjustment can be performed on two aspects, and the use and operation are simple and convenient.

As shown in fig. 1 and 2, the water inlet 2 and the water outlet 1 are both arranged on the side wall of the tube cavity extending axially, a sealing element is arranged between the switch shaft 3 and the inner wall of the tube cavity, and the switch shaft 3 can achieve the effect of sealing the tube cavity through the sealing element. And the switch shaft 3 can be the whole shaft section can all seal the lumen, also can be the partial shaft section can seal the lumen, in this embodiment, the switch shaft 3 is the step shaft, including shaft end section 31, sealed shaft section 32 and main shaft section 33 that connect gradually along axial switch shaft 3, and the sealing member sets up on sealed shaft section 32, and sealed shaft section 32 can realize the purpose of sealing the lumen through the sealing member. Along with the displacement, no matter how the axial position of the sealing shaft section 32 in the pipe cavity changes, the sealing can be realized, and the water is effectively prevented from overflowing from a handle and the like. So set up, this seal structure is simple, easily realize, and has guaranteed good sealed effect. Specifically, the seal may be an O-ring seal fitted over the seal shaft section 32.

For the purpose of easy handling, the switch shaft 3 is displaced as a whole to adjust the axial position of the seal shaft section 32 within the lumen. The switch shaft 3 may be slidably disposed and moved by a push-pull operation. Or a spiral track 9 for the switch shaft 3 to displace is arranged in the tube cavity, and the switch shaft 3 is clamped on the spiral track 9 and can be rotatably arranged relative to the spiral track 9; so set up, when switch shaft 3 rotated, receive spiral track 9 to promote, can produce the ascending displacement of axial to make sealed shaft section 32 produce the change of axial position, adjust rivers size or switching rivers. The rotating operation is simple and convenient, the realization is easy, the axial displacement is realized by the rotating arrangement of the switch shaft 3, the occupied space of parts is small, and the sealing matching is easier to realize.

Spiral track 9 can be by offering the recess or the protruding formation that the heliciform extends on the lumen inner wall, and correspond, be provided with the heliciform on the outer wall of switch shaft 3 and extend the arch or the recess that the heliciform extends, protruding and stretch into in the recess make switch shaft 3 and spiral track 9 block, simultaneously, the size transition fit of protruding and recess makes switch shaft 3 can rotate for spiral track 9, for the lumen.

The diameter of the shaft end section 31 of the switch shaft 3 is smaller than that of the sealing shaft section 32 and is positioned on one side of the sealing shaft section 32 close to the water outlet 1, and the diameter of the main shaft section 33 is larger than that of the sealing shaft section 32 and is positioned on one side of the sealing shaft section 32 close to the water inlet 2. The inner wall of the pipe cavity corresponding to the main shaft section 33 is provided with a spiral track 9, the inner wall between the water inlet 2 and the water outlet 1 is provided with an annular bulge to correspond to the O-shaped sealing ring of the sealing shaft section 32, and the water outlet 1 is arranged at one side close to the shaft end section 31. The spiral track 9 in the lumen is convex, and the main shaft section 33 is provided with a groove extending spirally to correspondingly engage with the spiral track 9. The diameter of the shaft end section 31 is smaller than that of the sealing shaft section 32, and when the shaft end section is displaced, the shaft end section corresponds to the area of the water outlet 1, the space at the water outlet 1 can be enlarged, and when the sealing shaft section 32 partially blocks the water inlet 2, the rapid and smooth outflow of water flow can be ensured.

The rotation of the switch shaft 3 can be operated by an external rotating handle 10. As shown in fig. 2 and 3, the switch structure further includes a first shaft seat 5 for sealing one end of the tube cavity and a clamping plug 4 connected to an inner end of the first shaft seat 5, the first shaft seat 5 is rotatably disposed with respect to the tube cavity, and one end of the switch shaft 3 is clamped to the clamping plug 4 and slidably disposed with respect to an axial direction of the clamping plug 4. The clamping plug 4 is sleeved with the switch shaft 3, one of the clamping plug and the switch shaft is provided with a clamping groove, and the other clamping plug and the switch shaft are correspondingly provided with a clamping bulge; meanwhile, the clamping protrusion and the clamping groove extend axially and are strip-shaped, and the clamping protrusion and the clamping groove are arranged in a relatively sliding mode. Then, the engaging plug 4 drives the switch shaft 3 to rotate along with the rotation of the first shaft seat 5, and simultaneously, the switch shaft 3 is displaced along the axial direction under the action of the spiral track 9. The outer end of the first shaft seat 5 can be exposed outside the tube cavity and used as a handle 10, and can also be connected with the handle 10.

When the switch structure uses gondola water faucet or all kinds of squirt rifle heads department, the switch structure is located the middle part of pipeline, radial both sides all connect the pipeline, in this kind of circumstances, the switch structure still includes the second axle seat 6 of sealed lumen other end and sets up dabber 7 in the lumen, dabber 7 extends and is located between primary shaft seat 5 and the second axle seat 6 along the lumen axial, switch shaft 3 and block stopper 4 are all established on dabber 7, block stopper 4 and switch shaft 3 homogeneous phase are for the rotatable setting of dabber 7. The switch structure further comprises two clamping caps 8 arranged at two ends of the tube cavity, two ends of the mandrel 7 penetrate through the two shaft seats respectively, then the mandrel is fixed on the clamping caps 8 through clamping springs, and the clamping caps 8 are fixedly connected with the tube wall. In this embodiment, the handle 10 is disposed between the first shaft seat 5 and the second shaft seat 6, two ends of the handle 10 are respectively connected to the first shaft seat 5 and the second shaft seat 6, when the handle 10 rotates, at least the first shaft seat 5 rotates therewith, or the handle 10, the first shaft seat 5, and the second shaft seat 6 are integrated. Sealing rings are arranged between the first shaft seat 5 and the second shaft seat 6 and the inner wall of the pipe cavity.

When the switch shaft 3 rotates to the end part to be abutted against the shaft seat, the axial displacement cannot be generated, but the operator cannot sense the axial displacement. Therefore, in this embodiment, the switch structure further includes a limiting structure for limiting the rotation end point of the switch shaft 3. Through limit structure, rotate to rotating the terminal point when the operator, can unable continuation rotation, can provide the perception for the operator, also can prevent that switch shaft 3 from excessively rotating, influence leakproofness, influence life.

Specifically, as shown in fig. 5, the limit structure includes a limit protrusion 16 disposed on the switch shaft 3 or the second shaft holder 6, and a limit stopper 17 disposed on the inner wall of the tube cavity, and the limit stopper 17 is located on a rotation path of the limit protrusion 16. In the preferred scheme, limit stop 17 is provided with two that the circumference distributes, rotates corresponding to the just reversal of switch shaft 3, when switch shaft 3 rotated to limit lug 16 and touch limit stop 17, can be blockked by limit stop 17 and unable rotation, and the operator also can know, has rotated to the rotation terminal point.

The embodiment also provides a shower gun, which comprises a spray head, a gun barrel and the switch structure, wherein the switch structure is arranged in the gun barrel. As shown in fig. 6, the gun barrel is divided into a hand-held tube 12 and a water spraying tube 11 which are connected in an angle, the switch structure is arranged at the joint of the two pipelines, and the axial direction of the tube cavity and the switch shaft 3 is the width direction of the joint of the two pipelines, namely the radial direction of the pipelines, but not the axial direction of the pipelines. The connecting end of the holding tube 12 is correspondingly provided with a water inlet 2, the connecting end of the spray tube 11 is correspondingly provided with the water outlet 1, and the other end of the spray tube 11 is provided with a spray head. So set up, the gondola water faucet rifle that this embodiment provided through a rotation operation, both can carry out the switching and adjust two management and control of rivers, the simple operation, and simple structure, the certain degree has reduced the cost of generation. The derivation process of the beneficial effect is substantially similar to the derivation process of the beneficial effect brought by the switch structure, and is not repeated herein.

The nozzle comprises N nozzles respectively communicated with the gun barrel, wherein N is a positive integer larger than one, and the diameter of the opening of each nozzle is gradually increased. Then this gondola water faucet rifle possesses the spraying effect of multiple different rivers, during the use, can carry out specific selection according to the demand. The figure illustrates four nozzles, and the opening areas of the water spray outlets of the four nozzles are gradually increased to form four water spray effects.

Each nozzle can be respectively communicated with the spray pipe 11 through a pipeline and a valve, but the purpose of simple structure is achieved, as shown in fig. 7, the spray head comprises a water outlet plug 15, a cover cap 13 and a water outlet net 14; the water outlet plug 15 covers the water spraying end of the water spraying pipe 11, a water guide port 151 for water to flow out is formed in the water outlet plug 15, and the water guide port 151 is eccentrically arranged; the cap 13 is rotatably sleeved on the spray pipe 11, the N nozzles are fixed on the cap end of the cap 13, the water inlet ends of the N nozzles are distributed along the circumferential direction, the N nozzles are integrally arranged in a circular shape, and the water inlet ends of the N nozzles are positioned on the relative rotation path of the water guide port 151; the water outlet net 14 covers the cap end of the cap 13, meanwhile, the water outlet ends of the nozzles with the largest opening diameters are positioned on the inner side (namely, the side close to the cap 13) of the water outlet net 14 and communicated with the water outlet net 14, and the water outlet ends of the other nozzles penetrate through the water outlet net 14 and are positioned on the outer side of the water outlet net 14. Then, when the cap 13 is rotated, each nozzle is rotated relative to the water guide port 151, and when one of the nozzles is rotated to be aligned with the water guide port 151, the nozzle is turned on to discharge water, and the remaining nozzles are closed. According to the use requirement, the required nozzle is rotated to be communicated with the water guide opening 151, and the water outlet effect can be adjusted.

The water outlet plug 15 may be in the form of a cover, so as to be conveniently fixed in the pipe. The water outlet plug 15 may further have a water guiding pipe, a water guiding opening 151 is formed at a pipe orifice of the water guiding pipe, and a sealing plug ring may be further disposed in the water guiding pipe and at the water guiding opening 151, so that when the water guiding opening 151 is aligned and communicated with any one nozzle, sealing may be achieved to prevent water leakage.

Because the water guide opening 151 is located inside the gun barrel, the outside cannot be seen, and the operator cannot judge whether the nozzle rotates to a proper position, therefore, in the embodiment, the shower gun further comprises a separation positioning structure for positioning the water outlet plug 15 by a rotation angle. One nozzle may correspond to one positioning point, and when the operator rotates, the operator can know whether each nozzle is aligned with the water guide port 151 through the reminding of the positioning point.

Specifically, the separation positioning structure comprises a spring ejector rod connected with the water outlet plug 15 and a positioning concave point 131 arranged on the cap 13, the spring ejector rod comprises a spring and a conical cap connected to one end of the spring, the other end of the spring is connected with the water outlet plug 15, and the water outlet plug 15 can be further provided with a fixed pipe column 152 for inserting and fixing the spring; the positioning concave points 131 are also conical and are provided in plurality, and the plurality of positioning concave points 131 are distributed along the circumferential direction and are arranged in one-to-one correspondence with the nozzles. The cone cap is urged against the cap wall of the cap 13 by the spring. When the cap 13 rotates to the cone cap to be clamped into one positioning concave point 131, the nozzle corresponding to the positioning concave point 131 is aligned and communicated with the water guide opening 151.

The derivation of the advantageous effect is to be noted that the words "first", "second", etc. are used herein without limiting the specific sequence, and are used only for distinguishing the respective components or functions. The stated "horizontal", "vertical", "up", "down", "left", "right", "inner" and "outer" are the ones that refer to when the switch structure is in the natural state of putting.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the invention comprise basic schemes, are independent from each other and are not restricted with each other, but can be combined with each other under the condition of no conflict, so that multiple effects are realized together.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.