阅读说明：本技术 一种可监测风机主轴轴承温度的主轴系统 (Main shaft system capable of monitoring temperature of main shaft bearing of fan ) 是由 王伟 黄晓通 施建州 林旭诚 孙旭 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种可监测风机主轴轴承温度的主轴系统,包括,箱体组件,所述箱体组件包括支架、轴承、端盖和传动轴,所述支架中设置有轴槽,所述轴承设置于轴槽两端,所述传动轴设置于所述轴承中,所述端盖连接所述轴承和支架；测温组件,所述放置盒和温度传感器,所述温度传感器设置于所述放置盒中,所述端盖上正对轴承处设置有插孔,所述放置盒设置于所述插孔中；本发明可利用温度传感器对主轴轴承进行监测,且可适应各种传感器的使用。(The invention discloses a main shaft system capable of monitoring the temperature of a fan main shaft bearing, which comprises a box body assembly, wherein the box body assembly comprises a support, a bearing, an end cover and a transmission shaft, a shaft groove is formed in the support, the bearing is arranged at two ends of the shaft groove, the transmission shaft is arranged in the bearing, and the end cover is connected with the bearing and the support; the temperature measuring component comprises a placing box and a temperature sensor, the temperature sensor is arranged in the placing box, a jack is arranged on the end cover opposite to the bearing, and the placing box is arranged in the jack; the invention can monitor the main shaft bearing by utilizing the temperature sensor and can be suitable for various sensors.)

1. The utility model provides a can monitor main shaft system of fan main shaft bearing temperature which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the box body assembly (100) comprises a support (101), bearings (102), end covers (103) and a transmission shaft (104), wherein a shaft groove (101a) is formed in the support (101), the bearings (102) are arranged at two ends of the shaft groove (101a), the transmission shaft (104) is arranged in the bearings (102), and the end covers (103) are connected with the bearings (102) and the support (101);

the temperature measuring assembly (200), place box (201) and temperature sensor (202), temperature sensor (202) set up in place box (201), be provided with jack (103a) on end cover (103) just to bearing (102), place box (201) set up in jack (103 a).

2. The spindle system capable of monitoring fan spindle bearing temperature of claim 1, wherein: the transmission shaft (104) comprises a middle shaft (104a), a sleeve shaft (104b) and an end shaft (104c), and the diameters of the middle shaft (104a), the sleeve shaft (104b) and the end shaft (104c) are reduced in sequence;

a first end face (104d) is arranged at the transition position of the middle shaft (104a) and the sleeve shaft (104b), and a second end face (104e) is arranged at the transition position of the sleeve shaft (104b) and the end shaft (104 c).

3. A spindle system capable of monitoring fan spindle bearing temperature according to claim 1 or 2, wherein: a retainer ring (101b) is arranged in the shaft groove (101a), the bearing (102) comprises an outer ring (102a) and an inner ring (102b), one end of the outer ring (102a) is in contact with the retainer ring (101b), and the other end of the outer ring (102a) is in contact with the end cover (103);

one end of the inner ring (102b) is in contact with the first end surface (104d), and the other end of the inner ring is in contact with a shaft sleeve (105) arranged on the end shaft (104 c).

4. The spindle system capable of monitoring fan spindle bearing temperature according to claim 3, wherein: a fan-shaped groove (101c) is formed in the end portion of the support (101), a first fan plate (101d) is arranged on one side of the fan-shaped groove (101c), and a first through hole (101e) is formed in the first fan plate (101 d);

and a threaded hole (101f) is formed in the end face of the bracket (101).

5. The spindle system capable of monitoring fan spindle bearing temperature according to claim 4, wherein: the end cover (103) comprises an arc plate (103b), a second fan plate (103c) arranged at one end of the arc plate (103b) and a ring plate (103d) arranged at the other end of the arc plate (103b), the arc plate (103b) is arranged in the fan-shaped groove (101c), and the inner side surface of the arc plate (103b) is in contact with the outer side surface of the outer ring (102 a).

6. The spindle system capable of monitoring fan spindle bearing temperature of claim 5, wherein: a second through hole (103c-1) is formed in the second fan plate (103c), and a third through hole (103d-1) is formed in the annular plate (103 d);

the second through hole (103c-1) and the first through hole (101e) are fixedly connected in series through a bolt, and the third through hole (103d-1) and the threaded hole (101f) are fixedly connected through a bolt.

7. The spindle system capable of monitoring the temperature of the main shaft bearing of the fan according to any one of claims 4 to 6, wherein: the placing box (201) comprises a middle cavity (201a) and side cavities (201b) arranged on two sides of the middle cavity (201a), the middle cavity (201a) and the side cavities (201b) are separated by a partition board (201c), a connecting hole (201d) is formed in the partition board (201c), and the connecting hole (201d) is communicated with the middle cavity (201a) and the side cavities (201 b);

and a valve (201e) is arranged in the connecting hole (201 d).

8. The spindle system capable of monitoring fan spindle bearing temperature of claim 7, wherein: one end of the middle cavity (201a) is provided with a first sliding groove (201a-1) communicated with the end part of the placing box (201), and one end of the side cavity (201b) is provided with a second sliding groove (201b-1) communicated with the end part of the placing box (201).

9. The spindle system capable of monitoring fan spindle bearing temperature of claim 8, wherein: an accommodating body (201f) is arranged in the first sliding groove (201a-1), a first piston (201f-1) is arranged at the end of the accommodating body (201f), the first piston (201f-1) is embedded in the middle cavity (201a), and a temperature sensor (202) is embedded in the accommodating body (201 f);

a contact body (201g) is arranged in the second sliding groove (201b-1), a second piston (201g-1) is arranged at the end part of the contact body (201g), and the second piston (201g-1) is embedded in the side cavity (201 b).

10. A spindle system for monitoring fan spindle bearing temperature according to claim 8 or 9, wherein: the middle cavity (201a) and the side cavity (201b) are filled with hydraulic oil, a clamping block (201f-2) is arranged on the side face of the accommodating body (201f), a window (201h) is arranged on the side face of the placing box (201), and the clamping block (201f-2) is located in the window (201 h).

Technical Field

The invention relates to the technical field of fan main shafts, in particular to a main shaft system capable of monitoring the temperature of a fan main shaft bearing.

Background

For early fans, a temperature monitoring and alarming system is not configured in a main bearing system. According to a large amount of fan operation data, in some special cases, the main bearing of the fan may have a temperature rise. If the fan cannot give an alarm in time and stops running at the moment, the main bearing of the fan is likely to be damaged due to overhigh temperature, and serious faults and shutdown loss are caused.

Based on the background, it is important to monitor the temperature of the main shaft of the fan, and the existing sensors are in contact and non-contact, so that the existing installation mode is difficult to adapt to the use of two sensors and ensure the correct use of the two sensors.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.

Therefore, the invention aims to solve the technical problems that the existing fan bearing has no temperature monitoring and is high in damage risk.

In order to solve the technical problems, the invention provides the following technical scheme: a main shaft system capable of monitoring the temperature of a fan main shaft bearing comprises a box body assembly, wherein the box body assembly comprises a support, a bearing, an end cover and a transmission shaft, a shaft groove is formed in the support, the bearing is arranged at two ends of the shaft groove, the transmission shaft is arranged in the bearing, and the end cover is connected with the bearing and the support;

the temperature measuring component comprises a placing box and a temperature sensor, wherein the temperature sensor is arranged in the placing box, a jack is arranged on the end cover opposite to the bearing, and the placing box is arranged in the jack.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the transmission shaft comprises a middle shaft, a sleeve shaft and an end shaft, and the diameters of the middle shaft, the sleeve shaft and the end shaft are reduced in sequence;

the transition part of the middle shaft and the sleeve shaft is provided with a first end face, and the transition part of the sleeve shaft and the end shaft is provided with a second end face.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: a check ring is arranged in the shaft groove, the bearing comprises an outer ring and an inner ring, one end of the outer ring is in contact with the check ring, and the other end of the outer ring is in contact with the end cover;

one end of the inner ring is in contact with the first end face, and the other end of the inner ring is in contact with a shaft sleeve arranged on the end shaft.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the end part of the bracket is provided with a fan-shaped groove, one side of the fan-shaped groove is provided with a first fan plate, and the first fan plate is provided with a first through hole;

and the end face of the bracket is provided with a threaded hole.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the end cover comprises an arc plate, a second sector plate arranged at one end of the arc plate and a ring plate arranged at the other end of the arc plate, the arc plate is arranged in the sector groove, and the inner side face of the arc plate is in contact with the outer side face of the outer ring.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the second fan plate is provided with a second through hole, and the annular plate is provided with a third through hole;

the second through hole and the first through hole are fixedly connected in series through a bolt, and the third through hole and the threaded hole are fixedly connected through a bolt.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the placing box comprises a middle cavity and side cavities arranged on two sides of the middle cavity, the middle cavity and the side cavities are separated by a partition plate, and a connecting hole is formed in the partition plate and is communicated with the middle cavity and the side cavities;

and a valve is arranged in the connecting hole.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: one end of the middle cavity is provided with a first sliding groove communicated with the end part of the placing box, and one end of the side cavity is provided with a second sliding groove communicated with the end part of the placing box.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: an accommodating body is arranged in the first sliding groove, a first piston is arranged at the end part of the accommodating body, the first piston is embedded in the middle cavity, and a temperature sensor is embedded in the accommodating body;

and a contact body is arranged in the second sliding groove, a second piston is arranged at the end part of the contact body, and the second piston is embedded in the side cavity.

As a preferred embodiment of the spindle system capable of monitoring the temperature of the main shaft bearing of the wind turbine according to the present invention, wherein: the middle cavity and the side cavity are filled with hydraulic oil, the side face of the accommodating body is provided with a clamping block, the side face of the placing box is provided with a window, and the clamping block is located in the window

The invention has the beneficial effects that: the invention can monitor the main shaft bearing by utilizing the temperature sensor and can be suitable for various sensors.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a schematic structural diagram of a rear bearing end of a spindle system capable of monitoring the temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a spindle system capable of monitoring the temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 3 is a schematic partial structural diagram of a transmission shaft of a spindle system capable of monitoring a temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 4 is an enlarged schematic structural view of a temperature measuring assembly shown in FIG. 2 in a spindle system capable of monitoring a temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a bracket end and an end cover of a spindle system capable of monitoring the temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a temperature measurement component in a spindle system capable of monitoring a temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention;

FIG. 7 is a structural diagram of a temperature measuring assembly of a spindle system capable of monitoring the temperature of a main shaft bearing of a wind turbine according to an embodiment of the present invention, the temperature measuring assembly being equipped with a non-contact temperature sensor in an initial state;

fig. 8 is a schematic structural diagram of an initial state in which a temperature measurement component in a spindle system capable of monitoring the temperature of a main shaft bearing of a fan according to an embodiment of the present invention is equipped with a contact temperature sensor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 5, the embodiment provides a main shaft system capable of monitoring the temperature of a main shaft bearing of a fan, which includes a box assembly 100, where the box assembly 100 includes a support 101, a bearing 102, an end cover 103 and a transmission shaft 104, a shaft groove 101a is formed in the support 101, the bearing 102 is disposed at two ends of the shaft groove 101a, the transmission shaft 104 is disposed in the bearing 102, and the end cover 103 connects the bearing 102 and the support 101; the temperature measuring component 200 is provided with a placing box 201 and a temperature sensor 202, the temperature sensor 202 is arranged in the placing box 201, a jack 103a is arranged on the end cover 103 opposite to the bearing 102, and the placing box 201 is arranged in the jack 103 a.

In the present embodiment, the temperature sensor 202 is disposed in the end cover 103 right opposite to the bearing 102, and monitors the temperature of the bearing 102 in real time, and it should be noted that the temperature sensor 202 is also connected to a temperature alarm, which can output a digital alarm signal to the fan control system and perform shutdown as required.

Specifically, the support 101 is used for bearing and placing the bearing 102 and the transmission shaft 104, the support 101 is divided into a blade end and a gear box end, the bearings 102 are arranged at the two ends, the transmission shaft 104 is located in the bearing 102 and supported and fixed by the bearing 102, the end portion of the transmission shaft 104 located at the gear box end is connected with the gear box (the right end of fig. 2), and the end portion of the transmission shaft 104 located at the blade end is connected with the fan blade (the left end of fig. 2), so that the transmission of torque is achieved, and the fan is enabled to rotate.

The transmission shaft 104 comprises a middle shaft 104a, a sleeve shaft 104b and an end shaft 104c, and the diameters of the middle shaft 104a, the sleeve shaft 104b and the end shaft 104c are reduced in sequence; a first end face 104d is arranged at the transition position of the middle shaft 104a and the sleeve shaft 104b, and a second end face 104e is arranged at the transition position of the sleeve shaft 104b and the end shaft 104 c.

A retainer ring 101b is arranged in the shaft groove 101a, the bearing 102 comprises an outer ring 102a and an inner ring 102b, one end of the outer ring 102a is contacted with the retainer ring 101b, and the other end of the outer ring is contacted with the end cover 103; the inner race 102b has one end in contact with the first end surface 104d and the other end in contact with a sleeve 105 provided on the end shaft 104 c.

Preferably, the end of the sleeve 105 contacts the second end face 104e to axially limit the bearing 102 and to allow the inner race 102b and the transmission shaft 104 to rotate synchronously.

A fan-shaped groove 101c is formed in the end portion of the support 101, a first fan plate 101d is arranged on one side of the fan-shaped groove 101c, and a first through hole 101e is formed in the first fan plate 101 d; the bracket 101 is provided with a screw hole 101f on the end surface.

It should be noted that the first through holes 101e are uniformly distributed along the circumferential direction of the first sector plate 101d, and the threaded holes 101f are uniformly distributed along the circumferential direction of the shaft groove 101a on the end surface of the bracket 101. The provision of the sector groove 101c facilitates the observation, and thus the placement of the bearing 102 in the shaft groove 101 a.

The end cover 103 comprises an arc plate 103b, a second fan plate 103c arranged at one end of the arc plate 103b and a ring plate 103d arranged at the other end of the arc plate 103b, the arc plate 103b is arranged in the fan-shaped groove 101c, and the inner side surface of the arc plate 103b is in contact with the outer side surface of the outer ring 102 a.

It should be noted that the bearing 102 is at the sector groove 101 c.

The second fan plate 103c is provided with a second through hole 103c-1, and the ring plate 103d is provided with a third through hole 103 d-1; the second through hole 103c-1 and the first through hole 101e are fixedly connected in series by bolts, and the third through hole 103d-1 and the threaded hole 101f are fixedly connected by bolts.

It should be noted that the second through holes 103c-1 are uniformly distributed along the circumferential direction of the second fan plate 103c, the second through holes 103c-1 correspond to the first through holes 101e in position and have a size fit, and the third through holes 103d-1 correspond to the threaded holes 101f in position and have a size fit.

The second sector plate 103c is used for being correspondingly connected with the first sector plate 101d to stabilize the position of the end cover 103, further, the ring plate 103d is used for axially limiting the outer ring 102a, specifically, the outer circumferential surface of the outer ring 102a is matched with the shaft groove 101a, one end of the outer ring 102a is contacted with the retainer ring 101b, and the other end of the outer ring is contacted with the ring plate 103d, under the bolt connection, the ring plate 103d is fixed with the side surface of the support 101, and the second sector plate 103c is fixed with the first sector plate 101d, so that the outer ring 102a is fixed with the support 101.

The sleeve 105 serves to fix the inner ring 102b to the drive shaft 104, in particular the first end face 104d is used to position and axially fix the drive shaft 104, with the aid of the sleeve 105 the inner ring 102b is fixed relative to the drive shaft 104.

Example 2

Referring to fig. 1 to 8, the difference between the present embodiment and the previous embodiment is that the placing box 201 includes a middle cavity 201a and a side cavity 201b disposed at two sides of the middle cavity 201a, the middle cavity 201a and the side cavity 201b are separated by a partition 201c, the partition 201c is provided with a connecting hole 201d, and the connecting hole 201d communicates the middle cavity 201a and the side cavity 201 b;

a valve 201e is provided in the connecting hole 201 d.

One end of the middle cavity 201a is provided with a first chute 201a-1 communicated with the end part of the placing box 201, and one end of the side cavity 201b is provided with a second chute 201b-1 communicated with the end part of the placing box 201.

An accommodating body 201f is arranged in the first chute 201a-1, a first piston 201f-1 is arranged at the end part of the accommodating body 201f, the first piston 201f-1 is embedded in the middle cavity 201a, and the temperature sensor 202 is embedded in the accommodating body 201 f; the first piston 201f-1 can slide in the middle cavity 201a, so as to control the accommodating body 201f to extend out of the first chute 201a-1 or to be completely accommodated in the first chute 201a-1, the temperature sensor 202 is embedded at one end of the accommodating body 201f, and preferably, an end portion of the temperature sensor 202 partially extends out of the accommodating body 201 f.

The second chute 201b-1 is provided with a contact body 201g, the end of the contact body 201g is provided with a second piston 201g-1, the second piston 201g-1 is embedded in the side cavity 201b, and the second piston 201g-1 can move in the side cavity 201b to control the contact body 201g to be completely accommodated or extend out of the side cavity 201 b.

The middle cavity 201a and the side cavity 201b are filled with hydraulic oil, and the middle cavity 201a and the side cavity 201b are communicated through the connecting hole 201d, so that the contact body 201g and the accommodating body 201f always move in opposite directions, and if the accommodating body 201f extends out of the first sliding groove 201a-1, the contact body 201g retracts into the second sliding groove 201 b-1.

It should be noted that the valve 201e may be a baffle inserted into the connecting hole 201d from the top of the placing case 201, and serves to block the connection between the bypass chamber 201b and the middle chamber 201a from the outside.

The side of the accommodating body 201f is provided with a fixture block 201f-2, the side of the placing box 201 is provided with a window 201h, the fixture block 201f-2 is located in the window 201h, and the fixture block 201f-2 is used for controlling the initial state of the accommodating body 201f, specifically:

when the contact type temperature sensor is used, the fixture block 201f-2 is pulled, the temperature sensor 202 extends out of the first sliding groove 201a-1, the contact body 201g retracts into the second sliding groove 201b-1, the temperature measuring assembly 200 is integrally inserted into the insertion hole 103a, the temperature sensor 202 is pushed into the first sliding groove 201a-1 after contacting the outer ring 102a, the contact body 201g moves outwards at a certain distance, the temperature sensor 202 still contacts the outer ring 102a after the temperature measuring assembly 200 is integrally placed in place, the valve 201e is closed, the side cavity 201b and the middle cavity 201a are isolated, the position of the temperature sensor 202 does not move any more, and the contact type temperature sensor 202 can be guaranteed to be always contacted with the outer ring 102 a.

When the non-contact sensor is used, the fixture block 201f-2 is pulled, the abutting body 201g extends out of the second sliding groove 201b-1, namely the temperature sensor 202 is located in the first sliding groove 201a-1, the temperature measuring assembly 200 is integrally inserted into the insertion hole 103a, the abutting body 201g contacts the outer ring 102a and is pushed towards the second sliding groove 201b-1, the temperature sensor 202 moves a certain distance towards the opening of the first sliding groove 201a-1 but does not extend out of the first sliding groove 201a-1, namely keeps a certain distance with the outer ring 102a all the time, the valve 201e is closed at the moment, the side cavity 201b and the middle cavity 201a are isolated, the position of the temperature sensor 202 does not move any more, and the non-contact sensor 202 can be guaranteed to keep a distance with the outer ring 102a all the time.

It should be noted that, if the first piston 201f-1 and the second piston 201g-1 are flush, both the abutting body 201g and the accommodating body 201f are completely inside the placing box 201, that is, only one of the abutting body 201g and the accommodating body 201f extends out of the placing box 201.

In this embodiment, the closing of valve 201e can be accomplished by controlling the insert plate structure shown in FIG. 7 to isolate bypass chamber 201b from middle chamber 201 a.

Preferably, the side cavities 201b at two sides are circular cavities, and the contact bodies 201g at two ends are arranged around the peripheral ring structure of the accommodating body 201 f.

It should be noted that, a groove structure is arranged on the accommodating body 201f, the temperature sensor 202 is embedded in the groove structure and is fixedly clamped by the fixture block 201f-2, it should be noted that the fixture block 201f-2 is detachably connected with the accommodating body 201f, when the temperature sensor 202 is installed, the fixture block 201f-2 is detached, after the temperature sensor 202 is installed, the fixture block 202f-2 is installed, and the temperature sensor 202 is fixed in the accommodating body 201 f.

Preferably, the latch 202f-2 can be connected to the sidewall of the accommodating body 201f by a bolt.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.