CONNECTOR ASSEMBLY WITH RELIABLE LOCKING STRUCTURE

A connector assembly includes a connector and a locking structure. The connector includes an insulating body. The insulating body includes at least one mating end portion. The mating end portion defines a first mating space for receiving a conductive terminal. The locking structure is held to the mating end portion. The locking structure has a pre-locking position and a locking position relative to the mating end portion. The locking structure includes a body portion and a resisting portion. The body portion is configured to receive a high voltage interlock terminal. The resisting portion is configured such that when the locking structure is at the pre-tightened position, the resisting portion is located outside the first mating space; when the locking structure is at the locking position, at least part of the resisting portion protrudes into the first mating space.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority of a Chinese Patent Application No. 202311056859.X, filed on Aug. 21, 2023 and titled “CONNECTOR ASSEMBLY”, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a connector assembly, which belongs to the technical field of connectors.

BACKGROUND

In the related art, a high voltage connector usually includes a separate insulating structure for fixing, positioning and insulating a high voltage interlock terminal. If conductive terminals in the high-voltage connector become loose, it will affect the electrical performance and even cause safety problems. Therefore, a locking structure is often used in the related art to fix the position of the conductive terminals. A separate part is added for each technical problem, which leads to more parts in the connector, and the corresponding mold and assembly costs are high.

SUMMARY

An object of the present disclosure is to provide a connector assembly which includes a connector and a locking structure. The locking structure can not only insulate and position the high-voltage interlock terminal, but also prevent conductive terminals in the connector from retreating.

In order to achieve the above object, the present disclosure adopts the following technical solution: a connector assembly, including: a connector including an insulating body, the insulating body including at least one mating end portion, the mating end portion defining a first mating space for receiving a conductive terminal; and a locking structure fixed to the mating end portion, the locking structure including a pre-locking position and a locking position which are relative to the mating end portion; the locking structure including a body portion and a resisting portion; the body portion being configured to receive a high voltage interlock terminal; wherein the resisting portion is configured such that: when the locking structure is located at the pre-locking position, the resisting portion is located outside the first mating space; when the locking structure is in the locking position, at least part of the resisting portion protrudes into the first mating space.

In order to achieve the above object, the present disclosure adopts the following technical solution: a connector assembly, including: a connector including an insulating body and a plurality of conductive terminals, the insulating body including an insulating body portion, a plurality of mating end portions extending from the insulating body portion, and an accommodating space formed by the plurality of mating end portions; each mating end portion defining a first mating space for receiving a corresponding conductive terminal; and a locking structure including a body portion, a plurality of holding arm portions and a resisting portion; the body portion being received in the accommodating space and configured to receive a high voltage interlock terminal; each holding arm portion being configured to be fixed to a corresponding mating end portion; the locking structure including a pre-locking position and a locking position which are relative to the connector; wherein the resisting portion is configured such that; when the locking structure is located at the pre-locking position, the resisting portion is located outside a corresponding first mating space; when the locking structure is in the locking position, at least part of the resisting portion protrudes into the corresponding first mating space.

Compared with the prior art, the connector assembly disclosed in the present disclosure includes the connector and the locking structure. The locking structure can not only insulate and position the high-voltage interlock terminal, but also realize the function of preventing the conductive terminal in the connector from retreating. This reduces the overall parts of the connector assembly, and the corresponding mold and assembly costs are reduced.

DETAILED DESCRIPTION

Exemplary embodiments will be described in detail here, examples of which are shown in drawings. When referring to the drawings below, unless otherwise indicated, same numerals in different drawings represent the same or similar elements. The examples described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of devices and methods consistent with some aspects of the application as detailed in the appended claims.

The terminology used in this application is only for the purpose of describing particular embodiments, and is not intended to limit this application. The singular forms “a”, “said”, and “the” used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings.

It should be understood that the terms “first”, “second” and similar words used in the specification and claims of this application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, “an” or “a” and other similar words do not mean a quantity limit, but mean that there is at least one; “multiple” or “a plurality of” means two or more than two. Unless otherwise noted, “front”, “rear”, “lower” and/or “upper” and similar words are for ease of description only and are not limited to one location or one spatial orientation. Similar words such as “include” or “comprise” mean that elements or objects appear before “include” or “comprise” cover elements or objects listed after “include” or “comprise” and their equivalents, and do not exclude other elements or objects. The term “a plurality of” mentioned in the present disclosure includes two or more.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Direction A1-A1in the drawings is a direction in which a connector assembly is mated with a mating connector.

The present disclosure discloses a connector assembly. Referring toFIG.1, the connector assembly includes a connector100and a locking structure200.

Referring toFIG.2andFIG.3, the connector100includes an insulating body1, a plurality of conductive terminals2received in the insulating body1, a cable assembly3with one end connected to the conductive terminals2, a shielding shell4at least partially surrounding the insulating body1, a protective housing6at least partially enclosing the shielding shell4, a first sealing ring5located in the protective housing6, a mating end shell7fixed to a mating end of the protective housing6, and a cable end shell8fixed to a cable end of the protective housing6.

Referring toFIG.5andFIG.6, the insulating body1includes an insulating body portion11and at least one mating end portion12extending outwardly from the insulating body portion11. In the illustrated embodiment, the insulating body1includes four mating end portions12. The four mating end portions12extend in parallel and outwardly from the insulating body portion11.

The mating end portion12includes a first mating end surface120and a first mating space121extending through the first mating end surface120along a mating direction A1-A1. The conductive terminals2are received in the first mating space121.

The insulating body portion11includes a cable end surface110. The cable end surface110is opposite to the first mating end surface120. The insulating body portion11includes a second mating space111. The second mating space111extends through the cable end surface110along the mating direction A1-A1. In the illustrated embodiment, the insulating body portion11has four second mating spaces111. Each of the first mating spaces121communicates with the second mating space111.

The mating end portion12includes a first wall122, a second wall123opposite to the first wall122, a third wall124connecting one end of the first wall122and one end of the second wall123, and a fourth wall125connecting the other end of the first wall122and the other end of the second wall123.

The first wall122, the second wall123, the third wall124and the fourth wall125surround the first mating space121.

The mating end portion12further includes a first locking groove126. The first locking groove126is recessed from the first wall122and the third wall124toward the first mating space121. The mating end portion12further includes a second locking groove127. The second locking groove127is recessed from a groove bottom of the first locking groove126toward the first mating space121and communicates with the first mating space121.

Referring toFIG.4, each conductive terminal2includes a first mating portion21and a first tail portion22connected to the first mating portion21. The first mating portion21is received in the first mating space121for mating with the mating connector. The first tail portion22is connected to the cable31of the cable assembly3.

The cable assembly3includes a plurality of cables31, a first fastening ring32, a second fastening ring33and a second sealing ring34.

Each cable31includes a core311, an insulating layer312at least partially wrapped on the core311, a shielding layer313at least partially wrapped on the insulating layer312, and an insulating skin314at least partially wrapped on the shielding layer313.

The core311is riveted to the first tail portion22for connection. The first fastening ring32is fastened around the shielding layer313. The second fastening ring33is sleeved on an outside of the first fastening ring32. The shielding layer313is folded back and fastened between the first fastening ring32and the second fastening ring33. One end of the second fastening ring33abuts against or engages with the shielding shell4.

The second sealing ring34is sleeved between the cable31and the cable end shell8.

The cable end shell8includes a first positioning groove81. The cable end shell8is engaged with the cable end of the protective housing6through the first positioning groove81.

In the illustrated embodiment, referring toFIG.3, the shielding shell4includes a first shell wall41, a second shell wall42opposite to the first shell wall41, a third shell wall43connecting one end of the first shell wall41and one end of the second shell wall42, a fourth shell wall44connecting the other end of the first shell wall41and the other end of the second shell wall42, and a fifth shell wall45perpendicular to and connected to the first shell wall41, the second shell wall42, the third shell wall43and the fourth shell wall44.

The fifth shell wall45includes at least one through hole portion451. A through hole of the through hole portion451extends through the fifth shell wall45along the mating direction A1-A1. In the illustrated embodiment, the fifth shell wall45includes four through hole portions451. Each through hole portion451corresponds to one second mating space111.

Referring toFIG.2andFIG.3, the protective housing6includes an inner housing61and an outer housing62which surrounds and is fixed to an outer periphery of the inner housing61. An annular receiving space63is formed between the outer periphery of the inner housing61and an inner wall of the outer housing62. The outer housing62includes an annular wall621and a first stepped wall622. The first stepped wall622extends outwardly from the outer periphery of the inner housing61along a direction perpendicular to the inner housing61. One end of the annular wall621is fixedly connected to the first stepped wall622.

The inner housing61includes a second stepped wall612. The second stepped wall612extends along a direction perpendicular to the mating direction A1-A1. The inner housing61includes a second positioning groove611.

The mating end shell7includes an annular inner wall71, an annular outer wall72surrounding an outer periphery of the annular inner wall71, and a connecting wall73connected to the annular inner wall71and the annular outer wall72. The connecting wall73is perpendicular to the annular inner wall71and the annular outer wall72.

An annular space74is formed between the annular inner wall71and the annular outer wall72.

The annular outer wall72includes a first positioning protrusion721. The first positioning protrusion721protrudes inwardly from an inner surface of the annular outer wall72.

After the mating end shell7is installed to the protective housing6, part of the inner housing61protrudes into the annular space74, and the first positioning protrusion721protrudes into the second positioning groove611to engage and position.

The first sealing ring5is located in the annular receiving space63. Moreover, along the mating direction A1-A1, one end of the first sealing ring5abuts against the annular outer wall72, and the other end abuts against the first stepped wall622.

The shielding shell4surrounds an outer side of the insulating body1. Along the mating direction A1-A1, one end of the shielding shell4abuts against the inner housing61, and the other end abuts against the second stepped wall612.

Referring toFIG.13andFIG.14, the locking structure200is configured to snap fit with the insulating body1. The locking structure200has a pre-locking position and a locking position which are relative to the insulating body1. InFIG.13andFIG.14, the locking structure200is in the pre-locking position.

Referring toFIG.5toFIG.10, the locking structure200includes a body portion201and a holding arm portion202.

The body portion201includes a second mating end surface2010, and at least one receiving and positioning portion2011. In the illustrated embodiment, the body portion201includes two receiving and positioning portions2011. The two receiving and positioning portions2011have the same structure.

The receiving and positioning portion2011defines a receiving cavity2011f.The receiving cavity2011fextends through the second mating end surface2010along an extending direction of the receiving cavity2011f.The extending direction of the receiving cavity2011fis in a same direction as the mating direction A1-A1.

Referring toFIG.10, the receiving and positioning portion2011further includes a first storage wall2011a,a second receiving wall2011bopposite to the first receiving wall2011a,a third receiving wall2011cconnecting one end of the first receiving wall2011aand one end of the second receiving wall2011b,and a fourth receiving wall2011dconnecting the other end of the first receiving wall2011aand the other end of the second receiving wall2011b.

The first receiving wall2011a,the second receiving wall2011b,the third receiving wall2011cand the fourth receiving wall2011djointly form a receiving wall2011eof the receiving and positioning portion2011. The receiving wall2011esurrounds the receiving cavity2011f.

The high voltage interlock terminal9is received in the receiving cavity2011f.The first receiving wall2011a, the second receiving wall2011b,the third receiving wall2011cand the fourth receiving wall2011dare located in four directions, such as top, bottom, left and right, of the high voltage interlock terminal9so as to limit the position of the high voltage interlock terminal9.

The body portion201further includes an end wall2012. The end wall2012extends from one end of the receiving wall2011etoward the receiving cavity2011f.

In the illustrated embodiment, referring toFIG.8andFIG.9, the end wall2012includes a first end wall2012a,a second end wall2012bopposite to the first end wall2012a,a third end wall2012cconnecting one end of the first end wall2012aand one end of the second end wall2012b,and a fourth end wall2012dconnecting the other end of the first end wall2012aand the other end of the second end wall2012b.

Referring toFIG.7, the first end wall2012aincludes a first guide inclined surface2012a1. The first guide inclined surface2012a1extends from the second mating end surface2010into the receiving cavity2011fand away from the second mating end surface2010. The second end wall2012bincludes a second guide inclined surface2012b1. The second guide inclined surface2012b1extends from the second mating end surface2010into the receiving cavity2011fand away from the second mating end surface2010. The third end wall2012cincludes a third guide inclined surface2012c1. The third guide inclined surface2012c1extends from the second mating end surface2010into the receiving cavity2011fand away from the second mating end surface2010. The fourth end wall2012dincludes a fourth guide inclined surface2012d1. The fourth guide inclined surface2012d1extends from the second mating end surface2010into the receiving cavity2011fand away from the second mating end surface2010.

The first guide inclined surface2012a1, the second guide inclined surface2012b1, the third guide inclined surface2012c1and the fourth guide inclined surface2012d1are connected with one another to form a guide inclined surface2012e.

Referring toFIG.8toFIG.10andFIG.16, the body portion201further includes a second positioning protrusion2013. The second positioning protrusion2013protrudes from the receiving wall2011etoward the receiving cavity2011f.

Along the mating direction A1-A1, the high voltage interlock terminal9has at least one surface abutting against the end wall2012and at least one surface abutting against the second positioning protrusion2013. That is, the end wall2012and the second positioning protrusion2013limit the position of the high voltage interlock terminal9in the mating direction A1-A1.

In the illustrated embodiment, the second positioning protrusion2013is L-shaped, and includes a first protrusion2013aand a second protrusion2013b.

The first protrusion2013aprotrudes from the fourth receiving wall2011dalong a wall surface of the second receiving wall2011btoward the receiving cavity2011f.The second protrusion2013bfurther protrudes from the first protrusion2013aalong a wall surface of the second receiving wall2011btoward the receiving cavity2011f.

It should be understood that in other embodiments of the present disclosure, the second positioning protrusion2013may also have other shapes, as long as it can realize the positioning of the high voltage interlock terminal9.

The second positioning protrusion2013has a first positioning surface2013c.

Referring toFIG.11andFIG.12, the high voltage interlock terminal9includes a second mating portion91and a second tail portion92connected to the second mating portion91.

The second mating portion91includes a first wall911, a second wall912opposite to the first wall911, a third wall913connecting one end of the first wall911and one end of the second wall912, and a fourth wall914connecting the other end of the first wall911and the other end of the second wall912.

Referring toFIG.12andFIG.16, the second mating portion91includes a second positioning surface915. The second positioning surface915extends from the second wall912along a direction perpendicular to the mating direction A1-A1.

The second mating portion91further includes a guide surface916. The guide surface916extends from the second wall912toward a direction away from the second wall912and away from the mating end of the high voltage interlock terminal9. The guide surface916is connected with the second positioning surface915along the mating direction A1-A1.

The second mating portion91further includes a mating end surface917. The mating end surface917is opposite to the second positioning surface915at intervals in the mating direction A1-A1.

After the high voltage interlock terminal9is mounted to the body portion201, in a circumferential direction of the high voltage interlock terminal9, the receiving wall2011eforms a position limit for the high voltage interlock terminal9. For example, the first wall911, the second wall912, the third wall913and the fourth wall914abut against an inner wall surface of the receiving wall2011e; and/or, an outer periphery of the second tail portion92abuts against the inner wall surface of the receiving wall2011e.

In the mating direction of the high voltage interlock terminal9, the mating end surface917abuts against the end wall2012, and the second positioning surface915abuts against the first positioning surface2013c.

Referring toFIG.10, in the illustrated embodiment, the receiving and positioning portion2011further includes at least one arc-shaped groove2014extending along the mating direction A1-A1. Each receiving and positioning portion2011has two arc-shaped grooves2014. One of the arc-shaped grooves2014is recessed from the third receiving wall2011ctoward the third receiving wall2011c; and the other of arc-shaped grooves2014is recessed from the fourth receiving wall2011dtoward the fourth receiving wall2011d.After the high voltage interlock terminal9is mounted to the body portion201, a groove bottom of the arc-shaped groove2014abuts against an outer periphery of the second tail portion92. At that time, the second tail portion92has been riveted with a relevant cable, and the second tail portion92has a cylindrical shape. The arc-shaped groove2014makes the receiving wall2011emore compact while constraining the high voltage interlock terminal9.

The body portion201further includes two disassembly holes2015. Each disassembly hole2015corresponds to one receiving and positioning portion2011. The disassembly hole2015extends through the second mating end surface2010along the mating direction A1-A1. Moreover, along the mating direction A1-A1, the disassembly hole2015corresponds to the guide surface916.

When the high voltage interlock terminal9needs to be disassembled, a tool can be used to press the guide surface916through the disassembly hole2015so as to disassemble the high voltage interlock terminal9.

In the illustrated embodiment, referring toFIG.7, the body portion201includes a first body wall2016, a second body wall2017opposite to the first body wall2016, a third body wall2018connecting one end of the first body wall2016and one end of the second body wall2017, and a fourth body wall2019connecting the other end of the first body wall2016and the other end of the second body wall2017.

The first body wall2016is parallel to the second body wall2017. The third body wall2018is parallel to the fourth body wall2019.

The holding arm portion202includes a first holding arm portion2021and a second holding arm portion2022.

The first holding arm portion2021includes a first arm portion2021aand a second arm portion2021bconnected to the body portion201. Referring toFIG.14, the first arm portion2021aand the second arm portion2021bare configured to be buckled on the outermost side walls of the two mating end portions12.

The first arm portion2021aincludes a first arm2021a1and a first locking arm2021a2. The first arm portion2021aextends outwardly from the first body wall2016along a direction perpendicular to the first body wall2016. The first locking arm2021a2extends from a distal end of the first arm2021a1along a direction perpendicular to an extension of the first arm2021a1.

The second arm portion2021bincludes a second arm2021b1and a second locking arm2021b2. The second arm portion2021bextends outwardly from the second body wall2017along a direction perpendicular to the second body wall2017. The second locking arm2021b2extends from a distal end of the second arm2021b1along a direction perpendicular to an extension of the second arm2021b1.

The first locking arm2021a2is disposed opposite to the second locking arm2021b2.

Similarly, the second holding arm portion2022includes a third arm portion2022aand a fourth arm portion2022bconnected to the body portion201through an auxiliary connecting plate203. The third arm portion2022aand the fourth arm portion2022bare configured to be buckled on the outermost side walls of the two mating end portions12.

The third arm portion2022aincludes a third arm2022a1and a third locking arm2022a2. The third arm2022a1extends from the auxiliary connecting plate203along a direction parallel to the first arm2021a1. The third locking arm2022a2extends from a distal end of the third arm2022a1along a direction perpendicular to an extension of the third arm2022a1.

The fourth arm portion2022bincludes a fourth arm2022b1and a fourth locking arm2022b2. The fourth arm2022b1extends from the auxiliary connecting plate203in a direction parallel to the second arm2021b1. The fourth locking arm2022b2extends from a distal end of the fourth arm2022b1along a direction perpendicular to an extension of the fourth arm2022b1.

The locking structure200includes a resisting portion204. The resisting portion204protrudes from the holding arm portion202toward the mating end portion12.

In the illustrated embodiment, the resisting portion204includes a first resisting block2041, a second resisting block2042, a third resisting block2043and a fourth resisting block2044.

The first resisting block2041protrudes outwardly from the first arm2021a1. One end of the first resisting block2041is connected to the first locking arm2021a2, and the other end of the first resisting block2041is connected to the body portion201.

The second resisting block2042protrudes outwardly from the second arm2021b1. One end of the second resisting block2042is connected to the second locking arm2021b2, and the other end of the second resisting block2042is connected to the body portion201.

The third resisting block2043protrudes outwardly from the third arm2022a1. One end of the third resisting block2043is connected to the third locking arm2022a2, and the other end of the third resisting block2043is connected to the auxiliary connecting plate203.

The fourth resisting block2044protrudes outwardly from the fourth arm2022b1. One end of the fourth resisting block2044is connected to the fourth locking arm2022b2, and the other end of the fourth resisting block2044is connected to the auxiliary connecting plate203.

The locking structure200further includes at least one third positioning protrusion205extending along the mating direction A1-A1. The locking structure200includes two third positioning protrusions205. The two third positioning protrusions205are located on opposite sides of the auxiliary connecting plate203.

Correspondingly, the outer wall of the mating end portion12defines at least one third positioning groove128and at least one fourth positioning groove129which are disposed side by side.

Referring toFIG.14, the insulating body1includes two third positioning grooves128. The two third positioning grooves128are located on opposite wall surfaces of the two adjacent mating end portions12(for example, corresponding top and bottom mating end portions12). The third positioning groove128is recessed from the outer wall of the mating end portion12toward the mating end portion12, and the third positioning groove128extends along the mating direction A1-A1.

The locking structure200includes two fourth positioning grooves129. The two fourth positioning grooves129are located on opposite wall surfaces of the two adjacent mating end portions12(for example, corresponding top and bottom mating end portions12). The fourth positioning groove129is recessed from the outer wall of the mating end portion12toward the mating end portion12, and the fourth positioning groove129extends along the mating direction A1-A1.

When the third positioning protrusion205is located in the third positioning groove128, the locking structure200is located at the pre-locking position. The first locking arm2021a2, the second locking arm2021b2, the third locking arm2022a2and the fourth locking arm2022b2are located in the first locking groove126. The first resisting block2041, the second resisting block2042, the third resisting block2043and the fourth resisting block2044are located in the second locking groove127. That is, when the locking structure200is located at the pre-locking position, the resisting portion204is located outside the first mating space121and does not affect the installation of the conductive terminal2.

When the third positioning protrusion205is located in the fourth positioning groove129, the locking structure200is located at the locking position. The first locking arm2021a2, the second locking arm2021b2, the third locking arm2022a2and the fourth locking arm2022b2are located in the first locking groove126. The first resisting block2041, the second resisting block2042, the third resisting block2043and the fourth resisting block2044are located in the second locking groove127and partially protrude into corresponding first mating spaces121. The resisting portion204prevents the conductive terminal2from moving along the mating direction A1-A1, and then locks the conductive terminal2to realize the function of preventing falling off.

In a certain direction, such as a top-bottom direction, perpendicular to the mating direction A1-A1, the first locking arm2021a2and the second locking arm2021b2are buckled on the outermost side walls of the two mating end portions12, respectively, so that the positioning of the locking structure200relative to the insulating body1in the top-bottom direction is realized.

In a direction, such as a left-right direction, perpendicular to the mating direction A1-A1, the third positioning protrusion205cooperates with the third positioning groove128or cooperates with the fourth positioning groove129to achieve positioning. In addition, in order to improve the stability of cooperation and the smoothness of relative movement between the mating end portion12and the locking structure200, the mating end portion12further includes three arc-shaped protrusions1210. Referring toFIG.6, the arc-shaped protrusions1210extend along the mating direction A1-A1. Along the direction of relative movement between the locking structure200and the mating end portion12, the three arc-shaped protrusions1210are located outside the third positioning groove128; located between the third positioning groove128and the third positioning groove128; and located outside the fourth positioning groove129.

Along the mating direction A1-A1, referring toFIG.13, the width of the locking arms (the first locking arm2021a2, the second locking arm2021b2, the third locking arm2022a2and the fourth locking arm2022b2) is similar to or the same as the width of the first locking groove126, so that the positioning of the locking structure200and the insulating body1in the mating direction A1-A1is realized.

In one embodiment of the present disclosure, along the mating direction A1-A1, the positioning between the locking structure200and the insulating body1can also be achieved through other components (for example, the adaptation of the width of the resisting portion204and the width of the second locking groove127).

In the foregoing embodiments, the holding arm portion202is U-shaped. In other embodiments of the present disclosure, the holding arm portion202may also be arc-shaped, as long as it can be adapted to the mating end portion12of the connector100.

In the foregoing embodiments, the connector100includes four mating end portions12which are arranged in a 2*2 array pattern. Correspondingly, the locking structure200has two holding arm portions202, namely the first holding arm portion2021and the second holding arm portion2022. The first holding arm portion2021is hugged on the two mating end portions12facing up and down. The second holding arm portion2022is hugged on the other two opposite mating end portions12facing up and down.

In other embodiments of the present disclosure, the connector100may include fewer (for example, two or even one) or more (for example, six or even more) mating end portions12. Correspondingly, it is only necessary to hold the holding arm portion202on the outer wall of the mating end portion12accordingly. In some embodiments, the third positioning protrusion205can be provided at other positions, such as an outer wall of the insulating body1.

The above embodiments are only used to illustrate the present disclosure and not to limit the technical solutions described in the present disclosure. The understanding of this specification should be based on those skilled in the art. Descriptions of directions, although they have been described in detail in the above-mentioned embodiments of the present disclosure, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the application, and all technical solutions and improvements that do not depart from the spirit and scope of the application should be covered by the claims of the application.