阅读说明：本技术 一种气浮离心压缩机轴承供气系统 (Bearing air supply system of air flotation centrifugal compressor ) 是由 商萍君 程继明 任重威 董梅艳 张丽仙 于 2021-03-26 设计创作，主要内容包括：本发明公开了一种气浮离心压缩机轴承供气系统,包括气浮式离心式压缩机、独立供气系统；所述气浮式离心式压缩机内设有气浮轴承组件和离心压缩机,气浮轴承组件设于离心压缩机一侧,所述离心压缩机通过一个驱动电机驱动；所述独立供气系统包括供气压缩机、油分离器、蒸发器；所述供气压缩机与油分离器之间连接供气压缩机排气管路Ⅱ,所述供气压缩机排气管路Ⅱ的一端连接供气压缩机的排气侧,其另一端连接油分离器的输入端；所述油分离器的两个出油口与供气压缩机的吸气侧之间分别连接有回油管路Ⅰ和回油管路Ⅱ,本发明,便于保证离心压缩机正常停机、断电停机过程中安全、平稳地停机。(The invention discloses an air-floating centrifugal compressor bearing air supply system, which comprises an air-floating centrifugal compressor and an independent air supply system; the air-floating centrifugal compressor is internally provided with an air-floating bearing assembly and a centrifugal compressor, the air-floating bearing assembly is arranged on one side of the centrifugal compressor, and the centrifugal compressor is driven by a driving motor; the independent air supply system comprises an air supply compressor, an oil separator and an evaporator; an air supply compressor exhaust pipeline II is connected between the air supply compressor and the oil separator, one end of the air supply compressor exhaust pipeline II is connected with the exhaust side of the air supply compressor, and the other end of the air supply compressor exhaust pipeline II is connected with the input end of the oil separator; an oil return pipeline I and an oil return pipeline II are respectively connected between two oil outlets of the oil separator and the air suction side of the air supply compressor.)

1. The utility model provides an air supporting centrifugal compressor bearing air supply system which characterized in that:

comprises an air-floating centrifugal compressor and an independent air supply system;

the air-floating centrifugal compressor is internally provided with an air-floating bearing assembly and a centrifugal compressor, the air-floating bearing assembly is arranged on one side of the centrifugal compressor, and the centrifugal compressor is driven by a driving motor;

the independent air supply system comprises an air supply compressor, an oil separator and an evaporator;

an air supply compressor exhaust pipeline II is connected between the air supply compressor and the oil separator, one end of the air supply compressor exhaust pipeline II is connected with the exhaust side of the air supply compressor, and the other end of the air supply compressor exhaust pipeline II is connected with the input end of the oil separator;

an oil return pipeline I and an oil return pipeline II are respectively connected between two oil outlets of the oil separator and the air suction side of the air supply compressor;

an exhaust port of the oil separator is connected with an exhaust pipeline III, and the exhaust pipeline III is connected with an air floatation bearing assembly through an exhaust pipeline branch; an exhaust check valve II is arranged on the exhaust pipeline III;

an air suction pipeline of the air supply compressor is connected between the air supply compressor and the evaporator, and two ends of the air suction pipeline of the air supply compressor are respectively connected with the air suction side of the air supply compressor and the output end of the evaporator;

the air suction pipeline of the air supply compressor is provided with an air suction one-way valve;

the air floatation bearing assembly and the evaporator are connected with an air return pipeline II;

a centrifugal compressor air suction pipeline is connected between the evaporator and the air suction side of the centrifugal compressor, and the centrifugal compressor air suction pipeline and the air floating bearing assembly are connected with an air return pipeline I;

and the centrifugal compressor is provided with an air suction stop valve on an air suction pipeline.

2. The air bearing supply system for an air-flotation centrifugal compressor as claimed in claim 1, wherein: the centrifugal compressor air supply system comprises a centrifugal compressor, an air supply pipeline I and a bearing air supply pipeline III, wherein the centrifugal compressor is connected with the air supply pipeline III;

an exhaust check valve I is arranged on the exhaust pipeline I;

the condenser is characterized in that a main liquid supply pipeline I and a main liquid supply pipeline II are sequentially connected between the condenser and the evaporator, the main liquid supply pipeline I is communicated with the main liquid supply pipeline II, and a cooling pipeline is communicated between the main liquid supply pipeline I and the driving motor.

3. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and the exhaust pipeline I is also provided with an exhaust pressure sensor and an exhaust temperature sensor.

4. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and the bearing air supply pipeline is also provided with an air supply one-way valve and a bearing air supply pressure sensor.

5. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and the return air pipeline I, the cooling pipeline and/or the bearing air supply pipeline are/is respectively provided with a filter.

6. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and the condenser is provided with a condensing pressure sensor and a condenser liquid level sensor.

7. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and a liquid phase temperature sensor is arranged on the main liquid supply pipeline I.

8. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein: and an electronic expansion valve I is arranged on the main liquid supply pipeline II.

9. The air bearing supply system for the air-flotation centrifugal compressor as claimed in claim 2, wherein:

and an electronic expansion valve II is arranged on the cooling pipeline.

Technical Field

The invention relates to the technical field of compressors, in particular to an air supply system for a bearing of an air flotation centrifugal compressor.

Background

The existing centrifugal compressor technology is a semi-closed centrifugal compressor adopting a rolling bearing, a sliding bearing, an air bearing or a magnetic suspension bearing, the technical development trend requires oil-free lubrication, maintenance of a lubrication oil circuit system, oil circuit management, oil return management and maintenance of the oil circuit system are eliminated, the oil-free lubrication also represents higher operation efficiency of the compressor and higher operation efficiency of a refrigeration system, and the semi-closed centrifugal compressor has the advantages of lower vibration, lower noise and operation stability, better customer experience and the like.

The centrifugal compressor adopting the air bearing can provide bearing air supply with required pressure by high-pressure exhaust of a refrigerating system when the refrigerating system operates; during starting and stopping, special design is needed to ensure stable bearing air supply and ensure that no mechanical contact and abrasion occur; particularly, when the power supply of the air supply of the bearing is suddenly cut off during sudden power failure, the air supply pressure difference of the air bearing is insufficient, and the motor running at high speed directly falls down and lands on the bearing or a supporting spring, so that the damage to the air bearing and other components can be caused.

Disclosure of Invention

The invention aims to provide an air supply system for a bearing of an air flotation centrifugal compressor, which is convenient for quickly, directly and stably supplying air to the bearing.

In order to solve the technical problems, the invention provides the following technical scheme: a bearing air supply system of an air-floating centrifugal compressor comprises the air-floating centrifugal compressor and an independent air supply system;

the air-floating centrifugal compressor is internally provided with an air-floating bearing assembly and a centrifugal compressor, the air-floating bearing assembly is arranged on one side of the centrifugal compressor, and the centrifugal compressor is driven by a driving motor;

the independent air supply system comprises an air supply compressor, an oil separator and an evaporator;

an air supply compressor exhaust pipeline II is connected between the air supply compressor and the oil separator, one end of the air supply compressor exhaust pipeline II is connected with the exhaust side of the air supply compressor, and the other end of the air supply compressor exhaust pipeline II is connected with the input end of the oil separator;

an oil return pipeline I and an oil return pipeline II are respectively connected between two oil outlets of the oil separator and the air suction side of the air supply compressor;

an exhaust port of the oil separator is connected with an exhaust pipeline III, and the exhaust pipeline III is connected with an air floatation bearing assembly through an exhaust pipeline branch; an exhaust check valve II is arranged on the exhaust pipeline III;

an air suction pipeline of the air supply compressor is connected between the air supply compressor and the evaporator, and two ends of the air suction pipeline of the air supply compressor are respectively connected with the air suction side of the air supply compressor and the output end of the evaporator;

the air suction pipeline of the air supply compressor is provided with an air suction one-way valve;

the air floatation bearing assembly and the evaporator are connected with an air return pipeline II;

a centrifugal compressor air suction pipeline is connected between the evaporator and the air suction side of the centrifugal compressor, and the centrifugal compressor air suction pipeline and the air floating bearing assembly are connected with an air return pipeline I;

and the centrifugal compressor is provided with an air suction stop valve on an air suction pipeline.

The centrifugal compressor further comprises a refrigeration air supply system, wherein the refrigeration air supply system comprises a condenser, an exhaust pipeline I is connected between the condenser and the exhaust side of the centrifugal compressor, and a bearing air supply pipeline is connected between the exhaust pipeline I and the exhaust pipeline III;

an exhaust check valve I is arranged on the exhaust pipeline I;

the condenser is characterized in that a main liquid supply pipeline I and a main liquid supply pipeline II are sequentially connected between the condenser and the evaporator, the main liquid supply pipeline I is communicated with the main liquid supply pipeline II, and a cooling pipeline is communicated between the main liquid supply pipeline I and the driving motor.

Furthermore, an exhaust pressure sensor and an exhaust temperature sensor are further arranged on the exhaust pipeline I.

Furthermore, an air supply one-way valve and a bearing air supply pressure sensor are also arranged on the bearing air supply pipeline.

Furthermore, a filter is respectively arranged on the air return pipeline I, the cooling pipeline and/or the bearing air supply pipeline.

Furthermore, a condensing pressure sensor and a condenser liquid level sensor are arranged on the condenser.

Furthermore, a liquid phase temperature sensor is arranged on the main liquid supply pipeline I.

Furthermore, an electronic expansion valve I is arranged on the main liquid supply pipeline II.

Furthermore, an electronic expansion valve II is arranged on the cooling pipeline.

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

1. the independent bearing air supply system is adopted to only supply air to the bearing in the pre-lubrication stage or the refrigeration system pressure difference insufficient stage, the air supply is more direct than other modes, and the air supply to the bearing can be quickly and stably controlled;

2. the pressure regulating valve is arranged, so that the exhaust pressure of the air supply compressor can be ensured to exhaust under lower pressure, and stable bearing air supply is facilitated;

3. the air suction one-way valve, the exhaust one-way valve II and the pressure regulating valve are arranged, so that once the centrifugal compressor is started to operate, the air circulation system of the air compressor and the oil separator cannot suck air from the evaporator.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the air supply system cycle of the present invention;

in the figure: 1-driving a motor; 2-an air bearing assembly; 3-a centrifugal compressor; 4-a condenser; 5-an evaporator; 6-expansion valve I; 7-electronic expansion valve II; 8-pressure regulating valve; 9-exhaust check valve I; 10-gas supply one-way valve; 11-suction stop valve; 12_～14-a filter; 15-a gas supply compressor; 16-an oil separator; 17-exhaust check valve II; 18-a suction check valve; 101-an exhaust line I; 102-centrifugal compressor suction line; 103-a main liquid supply pipeline I; 104-main supply line ii; 105-bearing gas supply line; 106-cooling circuit; 107-exhaust line branch; 108-gas return line I; 109-air return line II; 110-exhaust line II(ii) a 111-exhaust line iii; 112-air supply compressor suction line; 113-oil return line i; 114-oil return line II; p200-exhaust pressure sensor; p201-condensing pressure sensor; p202-evaporation pressure sensor; p203-bearing air supply pressure sensor; p204-bearing return air pressure sensor; t200-exhaust temperature sensor; t201-liquid phase temperature sensor; t202-supply air temperature sensor; l200-oil level sensor; l201-liquid level sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a bearing air supply system of an air-floating centrifugal compressor comprises the air-floating centrifugal compressor and an independent air supply system;

an air floatation bearing assembly 2 and a centrifugal compressor 3 are arranged in the air floatation type centrifugal compressor, and the centrifugal compressor 3 is driven by a driving motor 1;

the independent air supply system comprises an air supply compressor 15, an oil separator 16 and an evaporator 5;

an air supply compressor exhaust pipeline II 110 is connected between the air supply compressor 15 and the oil separator 16, one end of the air supply compressor exhaust pipeline II 110 is connected with the exhaust side of the air supply compressor 15, and the other end of the air supply compressor exhaust pipeline II 110 is connected with the input end of the oil separator 16;

an oil return pipeline I113 and an oil return pipeline II 114 are respectively connected between two oil outlets of the oil separator 16 and the air suction side of the air supply compressor 15;

an exhaust port of the oil separator 16 is connected with an exhaust pipeline III 111, and the exhaust pipeline III 111 is connected with the air floatation bearing assembly 2 through an exhaust pipeline branch 107; an exhaust check valve II 17 is arranged on the exhaust pipeline III 111;

an oil level sensor L200 is arranged on the air supply compressor 15; an air supply compressor suction pipeline 112 is connected between the air supply compressor 15 and the evaporator 5, and two ends of the air supply compressor suction pipeline 112 are respectively connected with the suction side of the air supply compressor 15 and the output end of the evaporator 5;

the air suction pipeline 112 of the air supply compressor is provided with an air suction one-way valve 18; the air bearing assembly 2 and the evaporator 5 are connected with a return air pipeline II 109;

a centrifugal compressor suction pipeline 102 is connected between the evaporator 5 and the suction side of the centrifugal compressor 3, the centrifugal compressor suction pipeline 102 and the air bearing assembly 2 are connected with an air return pipeline I108, and a bearing air return pressure sensor P204 is arranged on the air return pipeline I108; the centrifugal compressor suction pipeline 102 is provided with a suction stop valve 11.

The air supply compressor 15 is a small-sized positive displacement compressor, such as a rolling rotor or a scroll compressor, the displacement of the designed air supply compressor 15 is about 0.5% -1.0% of the displacement of the centrifugal compressor 3, for example, if the refrigerating capacity of the centrifugal compressor 3 under the standard water cooling working condition is 500kW, the positive displacement compressor with the refrigerating capacity of 2.5kW-5kW can be adopted under the same working condition. The air supply compressor 15 may be powered by a UPS power system, which may ensure the start-up operation of the air supply compressor 15 once power is removed.

The oil separator 16 is an oil separator 16 with a fine filtration distillation function, exhaust gas at the top of the air supply compressor 15 enters the oil separator 16 through an exhaust pipeline II 110, separation of lubricating oil and gas can be realized through two-stage coarse/fine filtration and one-stage distillation in the oil separator 16, the separated lubricating oil returns to the air suction side of the air supply compressor 15 through an oil return pipeline I113 and an oil return pipeline II 114 under the action of the air suction and exhaust pressure difference of the air supply compressor 15 and is discharged into a lowest oil tank in the air supply compressor 15 along with the compression process, oil supply distribution is arranged in the oil tank, the lubricating oil in the oil tank is internally distributed with oil supply and return oil, the exhaust gas of the air supply compressor 15 returns back and flows upwards to flow out of the compressor through the top of the shell, and a built-in motor of the air supply compressor 15 is cooled in.

The bearing air supply line 105 is also provided with an air supply one-way valve 10 and a bearing air supply pressure sensor P203. In order to filter and purify the mixture in the corresponding pipeline, a filter 12 is arranged on the return gas pipeline I108, a filter 13 is arranged on the cooling pipeline 106, and a filter 14 is arranged on the bearing gas supply pipeline 105.

The feed gas compressor suction line 112 draws gas from the top of the evaporator 5; the exhaust pipeline III 111 supplies air to the air bearing assembly 2 and exhausts the high-pressure air required by the air bearing assembly 2 through the exhaust pipeline branch 107 and the pressure regulating valve 8, and the bearing air supply pipeline 105 is provided with the air supply one-way valve 10 which plays a role of non-return, so that the high-pressure air of the exhaust pipeline III 111 cannot flow into the condenser 4; after the suspension of the bearing is completed, the pressure reduction of the high-pressure gas entering the air-bearing assembly 2 through the exhaust pipeline branch 107 returns to the evaporator 5 through the air return pipeline II 109, the air return pipeline I108 and a section of the centrifugal compressor suction pipeline 102 close to the evaporator 5; then returns to the air supply compressor 15 through the air supply compressor suction pipeline 112 and the suction check valve 18, and forms an air supply mode of a complete independent air supply system.

Because centrifugal compressor 3 has not started yet this moment, is provided with exhaust check valve I9 on the exhaust pipe I101, consequently centrifugal compressor 3, centrifugal compressor suction line 102 and the I101 unable formation air current circulation of exhaust pipe, and this air return that has just avoided air return pipe I108 drives the continuous rotation of centrifugal compressor 3 impeller.

The bearing air supply system of the air flotation centrifugal compressor also comprises a refrigeration air supply system, wherein the refrigeration air supply system comprises a condenser 4, an exhaust pipeline I101 is connected between the condenser 4 and the exhaust side of the centrifugal compressor 3, and a bearing air supply pipeline 105 is connected between the exhaust pipeline I101 and an exhaust pipeline III 111; an exhaust check valve I9 is arranged on the exhaust pipeline I101; a main liquid supply pipeline I103 and a main liquid supply pipeline II 104 are sequentially connected between the condenser 4 and the evaporator 5, the main liquid supply pipeline I103 is communicated with the main liquid supply pipeline II 104, and a cooling pipeline 106 is communicated between the main liquid supply pipeline I103 and the driving motor 1.

Once the centrifugal compressor 3 is started, the centrifugal compressor 3 sucks air from the evaporator 5, the sucked air is sucked into the centrifugal compressor suction pipeline 102, the return air of the return air pipeline i 108 is sucked into the centrifugal compressor 3 and simultaneously enters the evaporator 5, and the air in the air supply compressor suction pipeline 112 cannot reversely flow into the centrifugal compressor suction pipeline 102 because the air supply compressor suction pipeline 112 is provided with the air suction one-way valve 18.

The exhaust gas of the centrifugal compressor 3 enters the condenser 4 through the exhaust one-way valve I9 and the exhaust pipeline I101, the high-temperature and high-pressure refrigerant exhaust gas is condensed into high-pressure refrigerant liquid, the refrigerant liquid enters the main liquid supply pipeline I103 and then is divided into two paths, one path is the main liquid supply pipeline II 104, the refrigerant liquid is throttled and reduced in pressure through the electronic expansion valve I6 to be a mixture of low-temperature and low-pressure refrigerant liquid and gas, and then the refrigerant liquid and the gas enter the evaporator 5; the other path is a cooling pipeline 106 of the driving motor 1, the flow is adjusted through an electronic expansion valve II 7, the cooling of the driving motor 1 is realized, and the cooled refrigerant liquid or gas returns to the air suction pipeline 102 of the centrifugal compressor and the evaporator 5 through an air return pipeline I108 and an air return pipeline II 109, so that an air supply mode of a complete refrigeration air supply system is formed.

The exhaust pipeline I101 is further provided with an exhaust pressure sensor P200 and an exhaust temperature sensor T200, the exhaust pressure sensor P200 is used for measuring exhaust pressure in the exhaust pipeline I101, and the exhaust temperature sensor T200 is used for measuring a gas pressure value in the exhaust pipeline I101.

The condenser 4 is provided with a condensing pressure sensor P201 and a condenser liquid level sensor L201, which are respectively used for detecting the pressure and the liquid level in the condenser 4. A liquid phase temperature sensor T201 is arranged on the main liquid supply pipeline I103, and the liquid phase temperature sensor T201 is used for checking the temperature of the main liquid supply pipeline I103. An electronic expansion valve I6 is arranged on the main liquid supply pipeline II 104; an electronic expansion valve II 7 is arranged on the cooling pipeline 106, and both the electronic expansion valve I6 and the electronic expansion valve II 7 are used for adjusting the flow.

Still be equipped with air feed temperature sensor T202 and air feed pressure regulating valve 8 on the exhaust pipe III 111, air feed temperature sensor T202 and air feed pressure regulating valve 8 can locate: a section of pipeline behind the joint of the exhaust pipeline III 111 and the bearing air supply pipeline 105 and close to the air bearing assembly 2; the air supply temperature sensor T202 is used for detecting the temperature value on the exhaust pipeline III 111, and the air supply pressure regulating valve 8 is used for regulating the exhaust pressure to ensure that the air supply pressure of the bearing is stable and controllable. The air supply pressure regulating valve 8 can also be placed behind the valve of the exhaust check valve 17 II of the exhaust pipeline III 111 and before the joint of the exhaust pipeline III 111 and the bearing air supply pipeline 105, and the air supply pressure regulating valve 8 is used for ensuring that the pressure in the exhaust pipeline branch 107 input by the exhaust pipeline III 111 is not lower than the exhaust pressure of the centrifugal compressor 3, so that the pressure back-flowing and the unstable operation of the air supply compressor 15 are avoided.

When the evaporation pressure in the evaporator 5 gradually decreases, the supply air compressor 15 sucks the refrigerant gas of low temperature and low pressure from the evaporator 5 through the supply air compressor suction line 112 and the suction check valve 18, and the cooling of the compressor motor can be realized by the low temperature gas.

A bearing air supply pressure sensor P203 and a bearing air return pressure sensor P204 are arranged, the pressure measured by the bearing air supply pressure sensor P203 is defined as the bearing air supply pressure, and the pressure measured by the bearing air return pressure sensor P204 is defined as the bearing air return pressure;

simultaneously defining: bearing air supply pressure difference is bearing air supply pressure-bearing air return pressure;

the minimum pressure difference of air supply of the bearing is a set value, for example, 0.45 MPa; the method comprises the following steps: the air supply pressure difference of the bearing is more than or equal to the minimum air supply pressure difference of the bearing.

An evaporation pressure sensor P202 and a condensation pressure sensor P201 are arranged, the pressure measured by the evaporation pressure sensor P202 is defined as evaporation pressure, and the condensation pressure sensor P201 is defined as condensation pressure;

simultaneously defining: the differential pressure of the refrigeration air supply system is equal to condensation pressure-evaporation pressure;

the air supply mode is determined according to the air supply pressure difference of the bearing and the pressure difference of a refrigeration air supply system, and is selected according to the following table:

for example: before the centrifugal compressor 3 is started, the air supply mode of the independent air supply system is adopted, until the centrifugal compressor 3 is started and gradually loaded, the pressure difference of the refrigeration air supply system is gradually increased from 0MPa until the pressure difference of the refrigeration air supply system is greater than the minimum pressure difference of bearing air supply + upward offset and lasts for 30s, then the air supply mode of the bearing air supply system can be closed, and only the air supply mode of the refrigeration air supply system is adopted.

And when the differential pressure of the refrigeration air supply system is less than the minimum differential pressure of bearing air supply-downward offset and lasts for 30s, opening an independent bearing air supply mode and supplying air by the parallel refrigeration air supply system.

The upward offset and the downward offset are set in order to ensure that the independent bearing air supply mode is smoothly and smoothly opened and closed, large system fluctuation is avoided, and frequent independent opening and closing of the compressor 15 are avoided. The uplink bias and the downlink bias are both settable values, for example, the uplink bias is set to 0.7MPa, and the downlink bias is set to 0.2 MPa.

The air supply mode of the independent air supply system and the air supply mode of the refrigeration air supply system introduced above are adopted simultaneously, and the air supply modes of the two bearings are adopted according to different operation stages of the compressor: (1) pre-lubricating a bearing before starting, (2) continuously lubricating the bearing when the centrifugal compressor runs, (3) delaying lubricating the bearing when the centrifugal compressor stops, and (4) delaying lubricating the bearing when the power is cut off suddenly; the air supply mode of one or two bearing lubrication is determined at different stages. In the stages (1) and (3), an independent bearing air supply mode is adopted; in the stage (2), the air supply mode of the refrigeration air supply system is adopted, the air supply mode of an independent air supply system is assisted, and the parallel connection or the independent operation of the refrigeration air supply system and the independent air supply system is determined according to the monitoring of the pressure difference of the refrigeration air supply system; and (4) in the stage of (4), in the pipeline design and valve configuration, ensuring high-pressure liquid supply of the bearing until the shafting completely stops running.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.