阅读说明：本技术 气体回收装置、压缩机、氢气回收方法和加氢站 (Gas recovery device, compressor, hydrogen recovery method, and hydrogen station ) 是由 柴瑞杰 王志民 李光河 于 2021-09-22 设计创作，主要内容包括：本发明涉及气体回收技术领域并提供了一种气体回收装置、压缩机、氢气回收方法和加氢站,其中气体回收装置包括：鼓气装置,与压缩机的隔离腔连通,鼓气装置能够向隔离腔鼓入气体；回收管路,回收管路的一端与隔离腔连通。本发明的技术方案中,鼓气装置向隔离腔内鼓入氮气,泄露至隔离腔内的氢气能够随着氮气一同进入回收管路,氮气作为保护气,能够有效降低安全隐患。隔离腔内的气体通过回收管路可以再次投入使用,例如流回压缩机的进气口,一方面,有效避免了氢气的浪费,有利于降低成本；另一方面,大大降低了氢气直接排放到空气中带来的安全隐患,提高了安全性能。(The invention relates to the technical field of gas recovery and provides a gas recovery device, a compressor, a hydrogen recovery method and a hydrogen station, wherein the gas recovery device comprises: the air blowing device is communicated with the isolation cavity of the compressor and can blow air into the isolation cavity; and one end of the recovery pipeline is communicated with the isolation cavity. According to the technical scheme, the air blowing device blows nitrogen into the isolation cavity, hydrogen leaked into the isolation cavity can enter the recovery pipeline along with the nitrogen, and the nitrogen is used as protective gas, so that potential safety hazards can be effectively reduced. The gas in the isolation cavity can be put into use again through the recovery pipeline, for example, the gas flows back to the gas inlet of the compressor, on one hand, the waste of hydrogen is effectively avoided, and the cost is favorably reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.)

1. A gas recovery device, comprising:

the air blowing device (150) is used for being communicated with the isolated cavity of the compressor (200), and the air blowing device (150) can blow gas into the isolated cavity;

a recovery line (110), one end of the recovery line (110) being used for communicating with the isolation chamber.

2. The gas recovery device according to claim 1, further comprising:

a purification mechanism (120) provided in the recovery line (110);

a compression mechanism (130) disposed in said recovery line (110), said purifier mechanism (120) being positioned between said isolation chamber and said compression mechanism (130),

wherein gas passes through the isolation chamber, the purification mechanism (120), and the compression mechanism (130) in sequence.

3. The gas recovery device according to claim 2, wherein the recovery line (110) comprises:

a first conduit (111) having a first end (1111) and a second end (1112), the first end (1111) for communicating with a first isolation chamber (241);

a second pipe (112) having a third end (1121) and a fourth end (1122), said third end (1121) being adapted to communicate with a second segregation chamber (251);

third pipeline (113), have fifth end (1131) and sixth end (1132), fifth end (1131) with second end (1112) intercommunication, just fifth end (1131) with fourth end (1122) intercommunication, purification mechanism (120) are located third pipeline (113), compression mechanism (130) are located purification mechanism (120) with between sixth end (1132).

4. The gas recovery device according to claim 1, wherein the other end of the recovery line (110) is adapted to communicate with a gas inlet (214) of the compressor (200).

5. The gas recovery device according to claim 1, wherein the air-blowing device (150) is in communication with the first segregation chamber (241) through a first air path (161), the air-blowing device (150) is in communication with the second segregation chamber (251) through a second air path (162), and the air-blowing device (150) is configured to blow gas into the first segregation chamber (241) and the second segregation chamber (251).

6. The gas recovery device according to claim 3, further comprising:

a filter (141) disposed in the third conduit (113), the filter (141) being located between the fifth end (1131) and the purifying mechanism (120).

7. The gas recovery device according to claim 6, further comprising:

a relief valve (142) disposed in the third conduit (113), the relief valve (142) being located between the fifth end (1131) and the filter (141).

8. The gas recovery device according to claim 6 or 7, further comprising:

a first one-way valve (143) disposed in the third conduit (113), the first one-way valve (143) being positioned between the filter (141) and the purification mechanism (120).

9. The gas recovery device according to claim 3, further comprising:

first cooling means (144) in said third conduit (113), said first cooling means (144) being located between said purifying means (120) and said compressing means (130);

a second cooling mechanism (145) disposed on the third conduit (113), the second cooling mechanism (145) being located between the compression mechanism (130) and the sixth end (1132).

10. The gas recovery device according to claim 9, further comprising:

a second check valve (146) disposed on the third conduit (113), the second check valve (146) being located between the second cooling mechanism (145) and the sixth end (1132).

11. The gas recovery device of claim 10, further comprising:

a buffer tank (147) provided in the third pipeline (113), the buffer tank (147) being located between the second cooling mechanism (145) and the second check valve (146).

12. A compressor, comprising:

a first cylinder (210);

a cylinder (220);

a second cylinder (230);

the first isolation section (240) is provided with a first isolation cavity (241), one end of the first isolation section (240) is connected with the first cylinder (210), and the other end of the first isolation section (240) is connected with the cylinder (220);

the second isolation section (250) is provided with a second isolation cavity (251), one end of the second isolation section (250) is connected with the oil cylinder (220), and the other end of the second isolation section (250) is connected with the second air cylinder (230);

the gas recovery device (100) according to any one of claims 1 to 11, a recovery line (110) of the gas recovery device (100) communicating with the first isolation chamber (241), the recovery line (110) communicating with the second isolation chamber (251), an air blowing device (150) of the gas recovery device (100) communicating with the first isolation chamber (241), the air blowing device (150) communicating with the second isolation chamber (251).

13. A hydrogen gas recovery method for a gas recovery apparatus according to any one of claims 1 to 11, characterized by comprising:

blowing nitrogen into the isolation cavity;

filtering and purifying the mixed gas entering a recovery pipeline of the gas recovery device to obtain hydrogen;

pressurizing the hydrogen;

hydrogen was re-bubbled into the inlet.

14. A hydrogen station, comprising:

a control mechanism (410);

the gas recovery device (100) of any of claims 1 to 11, electrically connected with the control mechanism (410); or

The compressor (200) of claim 12, electrically connected to said control mechanism (410); or

A hydrogen reclamation method as recited in claim 13, applied to said control mechanism (410).

Technical Field

The invention relates to the technical field of gas recovery, in particular to a gas recovery device, a compressor, a hydrogen recovery method and a hydrogenation station.

Background

Among the correlation technique, liquid drive piston compressor carries out oil-free friction when compressing hydrogen in the hydrogenation station because carrying out between the jar wall of piston and cylinder, and hydrogen can leak the isolation chamber in the long-term use, and this part hydrogen can be along with piston motion direct discharge to the air in, has not only caused hydrogen extravagant, has certain potential safety hazard moreover.

Disclosure of Invention

In order to solve or improve the technical problems that hydrogen leaked into an isolation cavity is directly discharged into air, the hydrogen is wasted, and potential safety hazards exist, the invention aims to provide a gas recovery device.

Another object of the present invention is to provide a compressor having the above gas recovery device.

It is another object of the present invention to provide a hydrogen recovery method.

It is another object of the present invention to provide a hydrogen refueling station.

To achieve the above object, a first aspect of the present invention provides a gas recovery apparatus comprising: the air blowing device is used for being communicated with the isolation cavity of the compressor and can blow air into the isolation cavity; and one end of the recovery pipeline is communicated with the isolation cavity.

According to the embodiment of the gas recovery device provided by the invention, the air blowing device blows nitrogen into the isolation cavity, hydrogen leaked into the isolation cavity can enter the recovery pipeline along with the nitrogen, and the nitrogen is used as a protective gas, so that potential safety hazards can be effectively reduced. The gas in the isolation cavity can be put into use again through the recovery pipeline, for example, the gas flows back to the gas inlet of the compressor, on one hand, the waste of hydrogen is effectively avoided, and the cost is favorably reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

Specifically, the gas recovery device includes an air blowing device and a recovery line. The air blowing device is communicated with the isolation cavity of the compressor, and can blow air into the isolation cavity. It is worth to be noted that the air blowing device may be a nitrogen gas cylinder, and the gas blown into the isolation chamber by the air blowing device is nitrogen gas. Of course, the air blowing device can also blow other types of protective gas into the isolation chamber. One end of the recovery pipeline is communicated with the isolation cavity. One end of the recovery pipeline can be provided with one, two or more ports, the number of the isolation cavities can also be one, two or more, and the ports are communicated with the isolation cavities or other parts.

Among the correlation technique, liquid drive piston compressor carries out oil-free friction when compressing hydrogen in the hydrogenation station because carrying out between the jar wall of piston and cylinder, and hydrogen can leak the isolation chamber in the long-term use, and this part hydrogen can be along with piston motion direct discharge to the air in, has not only caused hydrogen extravagant, has certain potential safety hazard moreover.

In the technical scheme that this application was injectd, nitrogen gas is blown into to the isolation intracavity to the air-blowing device, reveals that the hydrogen to keeping apart the intracavity can be along with nitrogen gas together gets into the recovery pipeline, and nitrogen gas can effectively reduce the potential safety hazard as the protective gas. The gas in the isolation cavity can be put into use again through the recovery pipeline, for example, the gas flows back to the gas inlet of the compressor, on one hand, the waste of hydrogen is effectively avoided, and the cost is favorably reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

In addition, the technical scheme provided by the invention can also have the following additional technical characteristics:

in the above technical solution, the method further comprises: the purification mechanism is arranged on the recovery pipeline; the compression mechanism is arranged on the recovery pipeline, the purification mechanism is positioned between the isolation cavity and the compression mechanism, and gas sequentially passes through the isolation cavity, the purification mechanism and the compression mechanism.

In the technical scheme, the gas recovery device further comprises a purification mechanism and a compression mechanism. Specifically, recovery pipeline is located to purification mechanism, and purification mechanism can purify the gas that enters into recovery pipeline, filters impurity such as nitrogen gas and hydraulic oil. Specifically, the proposed mechanism comprises a filtering membrane, when the mixed gas passes through the filtering membrane, only hydrogen can permeate through the filtering membrane, and impurities such as nitrogen and hydraulic oil can be discharged from a tail gas exhaust system. The purified gas is relatively pure hydrogen so as to meet the use requirement of the hydrogen station.

Further, the compression mechanism is arranged on the recovery pipeline and can pressurize the gas. The purification mechanism is located between the isolation cavity and the compression mechanism, namely the compression mechanism is located behind the purification mechanism, gas entering the recovery pipeline is purified firstly and then subjected to pressurization treatment, and effective energy input is improved. After pressurization treatment, the pressure of the hydrogen can reach 5MPa to 20MPa, the pressure requirement of the hydrogen station is met, and the hydrogen can be put into use again.

Among the correlation technique, liquid drive piston compressor carries out oil-free friction when compressing hydrogen in the hydrogenation station because carrying out between the jar wall of piston and cylinder, and hydrogen can leak the isolation chamber in the long-term use, and this part hydrogen can be along with piston motion direct discharge to the air in, has not only caused hydrogen extravagant, has certain potential safety hazard moreover.

In the technical scheme defined by the application, the gas recovery device purifies and pressurizes the gas leaked to the isolation cavity, and finally the gas can be put into use again, so that on one hand, the waste of hydrogen is effectively avoided, and the cost is reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

In the above technical solution, the recovery pipeline includes: the first pipeline is provided with a first end and a second end, and the first end is used for being communicated with the first isolation cavity; the second pipeline is provided with a third end and a fourth end, and the third end is used for being communicated with the second isolation cavity; and the third pipeline is provided with a fifth end and a sixth end, the fifth end is communicated with the second end and the fourth end, the purification mechanism is arranged on the third pipeline, the compression mechanism is arranged on the third pipeline, and the compression mechanism is positioned between the purification mechanism and the sixth end.

In this technical scheme, the recovery pipeline includes first pipeline, second pipeline and third pipeline. Specifically, the first pipeline has a first end and a second end, the first end of the first pipeline is communicated with a first isolation cavity of the compressor, the second pipeline has a third end and a fourth end, the third end of the second pipeline is communicated with a second isolation cavity of the compressor, the third pipeline has a fifth end and a sixth end, the fifth end of the third pipeline is communicated with the second end of the first pipeline, and the fifth end of the third pipeline is communicated with the fourth end of the second pipeline. It can be understood that the first pipeline and the second pipeline are two branches, the first pipeline and the second pipeline are respectively communicated with one corresponding isolation cavity, the third pipeline is a converging way, gas leaked to the first isolation cavity enters the third pipeline through the first pipeline, and gas leaked to the second isolation cavity enters the third pipeline through the second pipeline.

Furthermore, the purification mechanism is arranged on the third pipeline, the compression mechanism is arranged on the third pipeline, and the compression mechanism is positioned between the purification mechanism and the sixth end. And after the gas in the first isolation cavity enters the third pipeline through the first pipeline, the gas is subjected to purification and pressurization treatment in sequence. And after the gas in the second isolation cavity enters the third pipeline through the second pipeline, the gas is also subjected to purification and pressurization treatment in sequence. The gas after the treatment is pure hydrogen, the pressure requirement of the hydrogen station is met, the gas can be put into use again, the waste of the hydrogen is effectively avoided, and the cost is reduced.

In the above technical scheme, the other end of the recovery pipeline is used for being communicated with an air inlet of the compressor.

In the technical scheme, one end of the recovery pipeline is communicated with the isolation cavity of the compressor, the other end of the recovery pipeline is communicated with the air inlet of the compressor, and gas in the isolation cavity can be put into use again through the recovery pipeline and flows back to the air inlet of the compressor. The gas after the treatment is pure hydrogen, the pressure requirement of the hydrogen station is met, the gas can be put into use again, the waste of the hydrogen is effectively avoided, and the cost is reduced.

In the technical scheme, the air blowing device is communicated with the first isolation cavity through the first air path, the air blowing device is communicated with the second isolation cavity through the second air path, and the air blowing device is used for blowing air into the first isolation cavity and the second isolation cavity.

In this technical scheme, through first gas circuit and second gas circuit, the gas blowing device can be respectively to first isolation chamber and the second isolation chamber gas of blowing into, and the gas blowing device can be the nitrogen cylinder, and the gas blowing device is as protective gas to the interior nitrogen gas of blowing into of isolation chamber. Due to oil-free friction between the piston and the cylinder wall, a part of hydrogen gas may leak into the isolation chamber and a part of hydraulic oil may leak from the cylinder into the isolation chamber through a gap of the support partition plate during long-term use. The nitrogen gas and the hydrogen gas and hydraulic oil leaked to the isolation chamber enter the recovery pipeline together.

In the above technical solution, the method further comprises: and the filter is arranged on the third pipeline and is positioned between the fifth end and the purifying mechanism.

In this embodiment, the gas recovery device further includes a filter. Specifically, the filter is disposed in a third pipeline of the recycling pipeline, and the filter is located between a fifth end of the third pipeline and the purifying mechanism. The gas that enters into recovery pipeline by the isolation chamber is before the purification, and the filter can filter the particle impurity in the gas, carries out preliminary treatment to the mist, avoids the great particle impurity of particle diameter to constitute to the purifying machine and damages, is favorable to improving gas recovery device's life.

In the above technical solution, the method further comprises: and the safety valve is arranged on the third pipeline and is positioned between the fifth end and the filter.

In this solution, the gas recovery device further comprises a safety valve. Specifically, the safety valve is arranged on a third pipeline of the recovery pipeline, and the safety valve is arranged between a fifth end of the third pipeline and the filter, and it can be understood that gas passes through the isolation cavity, the safety valve, the filter, the purification mechanism, the compression mechanism and the gas inlet in sequence. The safety valve is a starting and closing part and is in a normally closed state under the action of external force, and when the pressure of a medium in equipment or a pipeline rises to exceed a specified value, the medium is discharged to the outside of the system to prevent the pressure of the medium in the pipeline or the equipment from exceeding the specified value. By providing the safety valve, the pressure of the gas introduced into the recovery line can be controlled not to exceed a predetermined value.

It is worth mentioning that a pressure detection system, such as a pressure sensor, may be further disposed on the third pipeline to achieve precise control of the pressure of the gas entering the recycling pipeline.

In the above technical solution, the method further comprises: and the first one-way valve is arranged on the third pipeline and is positioned between the filter and the purification mechanism.

In this technical scheme, gas recovery unit still includes first check valve. Check valves, also known as check valves or back valves, are used in hydraulic systems to prevent the reverse flow of a medium or in pneumatic systems to prevent the reverse flow of compressed air. Specifically, the first check valve is arranged on the third pipeline, the first check valve is positioned between the filter and the purification mechanism, and gas entering the recovery pipeline sequentially passes through the filter, the first check valve and the purification mechanism. Through setting up first check valve, can avoid the gas backward flow through the purification, ensure the purity of hydrogen.

In the above technical solution, the method further comprises: the first cooling mechanism is arranged on the third pipeline and is positioned between the purifying mechanism and the compressing mechanism; and the second cooling mechanism is arranged on the third pipeline and is positioned between the compression mechanism and the sixth end.

In this embodiment, the gas recovery device further includes a first cooling mechanism and a second cooling mechanism. Specifically, the first cooling mechanism is arranged on the third pipeline, the first cooling mechanism is positioned between the purifying mechanism and the compressing mechanism, and the gas sequentially passes through the purifying mechanism, the first cooling mechanism and the compressing mechanism. The purification mechanism heats the gas, pure hydrogen is obtained after high-temperature purification, the first cooling mechanism cools the hydrogen, and the hydrogen enters the compression mechanism after reaching the set temperature.

Further, the third pipeline is located to the second cooling mechanism, and second cooling mechanism is located between the sixth end of compression mechanism and third pipeline, and gas passes through compression mechanism, second cooling mechanism and air inlet in proper order, and compression mechanism compresses the pressure boost to gas, and after gas reached set pressure, the cooling that needs to cool down through second cooling mechanism to satisfy the temperature demand of hydrogen station to hydrogen.

In the above technical solution, the method further comprises: and the second one-way valve is arranged on the third pipeline and is positioned between the second cooling mechanism and the sixth end.

In this solution, the gas recovery device further comprises a second one-way valve. Check valves, also known as check valves or back valves, are used in hydraulic systems to prevent the reverse flow of a medium or in pneumatic systems to prevent the reverse flow of compressed air. Specifically, the second check valve is arranged on the third pipeline, the second check valve is located between the second cooling mechanism and the sixth end of the third pipeline, and gas in the recovery pipeline sequentially passes through the second cooling mechanism, the second check valve and the gas inlet. Through setting up the second check valve, can avoid through purification, the gaseous backward flow of pressure boost, ensure that hydrogen is enough pure and can satisfy the pressure demand at hydrogen station.

In the above technical solution, the method further comprises: and the buffer tank is arranged on the third pipeline and is positioned between the second cooling mechanism and the second one-way valve.

In this technical scheme, gas recovery unit still includes the buffer tank. Specifically, the buffer tank is arranged on the third pipeline, the buffer tank is located between the second cooling mechanism and the second one-way valve, and gas in the recovery pipeline sequentially passes through the second cooling mechanism, the buffer tank and the second one-way valve. Through setting up the buffer tank, can cushion gas to reach the purpose of control gas velocity of flow.

A second aspect of the present invention provides a compressor comprising: a first cylinder; an oil cylinder; a second cylinder; the first isolation section is provided with a first isolation cavity, one end of the first isolation section is connected with the first cylinder, and the other end of the first isolation section is connected with the cylinder; the second isolation section is provided with a second isolation cavity, one end of the second isolation section is connected with the oil cylinder, and the other end of the second isolation section is connected with the second air cylinder; in the gas recovery device in any of the above embodiments, the recovery pipeline of the gas recovery device is communicated with the first isolation cavity, the recovery pipeline is communicated with the second isolation cavity, the air blowing device of the gas recovery device is communicated with the first isolation cavity, and the air blowing device is communicated with the second isolation cavity.

According to an embodiment of the compressor of the present invention, the compressor includes a first cylinder, a second cylinder, a first isolation section, a second isolation section, and a gas recovery device. Wherein, the first cylinder is equipped with the air inlet, and the second cylinder is equipped with the gas outlet. The first isolation section is provided with a first isolation cavity, one end of the first isolation section is connected with the first cylinder, and the other end of the first isolation section is connected with the cylinder. The second isolation section is provided with a second isolation cavity, one end of the second isolation section is connected with the oil cylinder, and the other end of the second isolation section is connected with the second air cylinder. Specifically, the first cylinder comprises a first cylinder wall and a first piston rod, the first piston rod is connected inside the first cylinder wall in a sliding mode, a first end cover is arranged at one end of the first cylinder wall, and the air inlet is formed in the first end cover. Furthermore, the second cylinder comprises a second cylinder wall and a second piston rod, the second piston rod is connected inside the second cylinder wall in a sliding mode, a second end cover is arranged at one end of the second cylinder wall, and the air outlet is formed in the second end cover. The oil cylinder comprises a third cylinder wall and a third piston rod, and the third piston rod is connected to the inside of the third cylinder wall in a sliding mode. The first piston rod penetrates through the first isolation cavity, the second piston rod penetrates through the second isolation cavity, one end of the third piston rod is connected with the first piston rod, and the other end of the third piston rod is connected with the second piston rod. When the compressor normally works, hydrogen enters the first cylinder from the air inlet, the hydraulic system drives the first piston rod, the second piston rod and the third piston rod to move, and the hydrogen in the second cylinder is compressed and then discharged from the air outlet. The first isolation section is additionally arranged between the first air cylinder and the oil cylinder, and the second isolation section is additionally arranged between the second air cylinder and the oil cylinder, so that hydrogen and hydraulic oil can be isolated.

Further, the air blowing device is communicated with the first isolation cavity through the first air path, the air blowing device is communicated with the second isolation cavity through the second air path, and air can be blown into the first isolation cavity and the second isolation cavity through the air blowing device. It is worth to be noted that the air blowing device may be a nitrogen cylinder, and the gas blown into the isolation chamber by the air blowing device is hydrogen. Of course, the air blowing device can also blow other types of protective gas into the isolation chamber.

Further, the first isolation cavity, the second isolation cavity and the gas inlet are communicated with a recovery pipeline of the gas recovery device. Due to oil-free friction between the piston and the cylinder wall, a part of hydrogen gas may leak into the isolation chamber and a part of hydraulic oil may leak from the cylinder into the isolation chamber through a gap of the support partition plate during long-term use. The air blowing device blows nitrogen into the isolation cavity as protective gas, and the nitrogen is communicated with hydrogen leaked to the isolation cavity, hydraulic oil and the like and enters the recovery pipeline. The mist is discharged by the export of keeping apart the chamber, passes through filter, pressure measurement system, first check valve in proper order, arrives clarifier (being purification mechanism), and only hydrogen can permeate filtration membrane, and impurity such as another nitrogen gas and hydraulic oil is discharged from tail gas exhaust system. The purified hydrogen purified at high temperature reaches the first cooling mechanism, enters a hydrogen compressor (a compression mechanism), is pressurized to reach the pressure (5 MPa to 20 MPa) of the hydrogen main pipeline again, then passes through the second cooling mechanism, the buffer tank and the second one-way valve, reaches the hydrogen main pipeline, and is put into use again.

The compressor includes any one of the gas recovery devices in the first aspect, so that the beneficial effects of any one of the embodiments are achieved, and are not described herein again.

A third aspect of the present invention provides a hydrogen recovery method for use in the gas recovery apparatus of any one of the above embodiments, comprising: blowing nitrogen into the isolation cavity; filtering and purifying the mixed gas entering a recovery pipeline of the gas recovery device to obtain hydrogen; pressurizing the hydrogen; hydrogen was re-bubbled into the inlet.

According to the embodiment of the hydrogen recovery method provided by the invention, the hydrogen recovery method is used for a gas recovery device, and comprises the following specific steps:

the first step is as follows: nitrogen gas was bubbled into the isolation chamber. The staff enters protective gas to the isolation chamber through the gas blowing device, and hydrogen, hydraulic oil and the like leaked to the isolation chamber through the nitrogen communication enter the recovery pipeline, so that the gas recovery device can perform subsequent process treatment on the mixed gas. Specifically, the air blowing device is communicated with the first isolation cavity through the first air path, the air blowing device is communicated with the second isolation cavity through the second air path, and air can be blown into the first isolation cavity and the second isolation cavity through the air blowing device. It is worth to be noted that the air blowing device may be a nitrogen cylinder, and the gas blown into the isolation chamber by the air blowing device is hydrogen. Of course, the air blowing device can also blow other types of protective gas into the isolation cavity;

the second step is that: and filtering and purifying the mixed gas entering the recovery pipeline of the gas recovery device to obtain the hydrogen. The recovery pipeline is located to purification mechanism, and purification mechanism can purify the gas that enters into the recovery pipeline, filters impurity such as nitrogen gas and hydraulic oil. Specifically, the proposed mechanism comprises a filtering membrane, when the mixed gas passes through the filtering membrane, only hydrogen can permeate through the filtering membrane, and impurities such as nitrogen and hydraulic oil can be discharged from a tail gas exhaust system. The purified gas is relatively pure hydrogen so as to meet the use requirement of a hydrogenation station;

the third step: and (4) pressurizing the hydrogen. The compression mechanism is arranged on the recovery pipeline and can compress and pressurize gas. The compression mechanism is positioned between the purification mechanism and the air inlet, and gas entering the recovery pipeline is purified and then subjected to pressurization treatment, so that effective energy input is improved. After pressurization treatment, the pressure of the hydrogen can reach 5MPa to 20MPa, the pressure requirement of a hydrogenation station is met, and the hydrogen can be put into use again;

the fourth step: hydrogen was re-bubbled into the inlet. The gas recovery device purifies and pressurizes the gas leaked to the isolation cavity, the gas can be put into use again, and hydrogen enters the first cylinder again through the gas inlet.

An embodiment of a fourth aspect of the invention provides a hydrogen refueling station comprising: a control mechanism; the gas recovery device in any one of the above embodiments, electrically connected to the control mechanism; or the compressor in the above embodiment, electrically connected to the control mechanism; or the hydrogen recovery method in the above embodiment, is used for the control mechanism.

The invention provides a hydrogenation station, which comprises a control mechanism and a gas recovery device, wherein the control mechanism is electrically connected with the gas recovery device. The recovery pipeline of the gas recovery device purifies and pressurizes the hydrogen leaked to the isolation cavity, the protective gas and the like, and finally the pure hydrogen meeting the pressure requirement of the hydrogen filling station is obtained and put into use again, so that the waste of the hydrogen is effectively avoided.

Alternatively, the hydrogenation station comprises a control mechanism and a compressor, and the control mechanism is electrically connected with the compressor. The gas leaked to the isolation cavity in the compressor reaches a hydrogen main pipeline after purification, compression, pressurization and other treatment, and is put into use again.

Alternatively, the hydrogen plant includes a control mechanism and a hydrogen recovery process, the hydrogen recovery process being used for the control mechanism. The control mechanism adopts a hydrogen recovery method, and the gas leaked to the isolation cavity is subjected to purification, compression, pressurization and other treatment and then is put into use again, so that the waste of hydrogen is effectively avoided.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 shows a schematic view of a gas recovery device according to an embodiment of the invention;

FIG. 2 shows a first schematic view of a compressor according to an embodiment of the present invention;

FIG. 3 illustrates a second schematic view of a compressor according to an embodiment of the present invention;

FIG. 4 shows a schematic diagram of a hydrogen recovery process according to one embodiment of the invention;

FIG. 5 shows a schematic diagram of a hydrogen refueling station according to one embodiment of the present invention;

fig. 6 shows a schematic diagram of a hydrogen refueling station according to another embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

100: a gas recovery device; 110: a recovery pipeline; 111: a first pipeline; 1111: a first end; 1112: a second end; 112: a second pipeline; 1121: a third end; 1122: a fourth end; 113: a third pipeline; 1131: a fifth end; 1132: a sixth terminal; 120: a purification mechanism; 130: a compression mechanism; 141: a filter; 142: a safety valve; 143: a first check valve; 144: a first cooling mechanism; 145: a second cooling mechanism; 146: a second one-way valve; 147: a buffer tank; 150: an air blowing device; 161: a first gas path; 162: a second gas path; 200: a compressor; 210: a first cylinder; 211: a first cylinder wall; 212: a first piston rod; 213: a first end cap; 214: an air inlet; 220: an oil cylinder; 221: a third cylinder wall; 222: a third piston rod; 230: a second cylinder; 231: a second cylinder wall; 232: a second piston rod; 233: a second end cap; 234: an air outlet; 240: a first isolation section; 241: a first isolated cavity; 250: a second isolation section; 251: a second isolated cavity; 400: a hydrogen station; 410: and a control mechanism.

Detailed Description

In order that the above objects, features and advantages of the embodiments of the present invention can be more clearly understood, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, embodiments of the present invention may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.

A gas recovery apparatus 100, a compressor 200, a hydrogen recovery method, and a hydrogen refueling station 400 provided according to some embodiments of the present invention are described below with reference to fig. 1 to 6.

Example one

As shown in fig. 1, a gas recycling apparatus 100 according to an embodiment of the present invention includes a gas blowing device 150 and a recycling line 110. As shown in fig. 2, the air blowing device 150 is communicated with the isolated cavity, and the air blowing device 150 can blow air into the isolated cavity. It should be noted that the air blowing device 150 may be a nitrogen gas cylinder, and the gas blown into the isolation chamber by the air blowing device 150 is nitrogen gas. Of course, the blowing device 150 may also blow other types of shielding gas into the isolated cavity. One end of the recovery line 110 communicates with the isolated chamber in the compressor 200. One end of the recovery line 110 may be formed with one, two, or more ports, and the number of the isolation chambers may be one, two, or more, the ports being communicated with the isolation chambers or other portions.

In the related art, when the liquid-driven piston compressor compresses hydrogen in the hydrogen station 400, due to oil-free friction between the piston and the cylinder wall of the cylinder, the hydrogen may leak to the isolation cavity in the long-term use process, and the part of hydrogen is directly discharged to the air along with the movement of the piston, so that the hydrogen waste is caused, and certain potential safety hazards exist.

In the technical scheme that this application was injectd, air-blowing device 150 is to keeping apart the intracavity and is blown nitrogen gas, and the hydrogen of revealing to keeping apart the intracavity can be along with nitrogen gas together gets into recovery pipeline 110, and nitrogen gas is as the protective gas, can effectively reduce the potential safety hazard. The gas in the isolation chamber can be put into use again through the recovery pipeline 110, for example, the gas flows back to the gas inlet 214 of the compressor 200, on one hand, the waste of hydrogen is effectively avoided, and the cost is reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

Example two

As shown in fig. 1 and 2, the gas recovery apparatus 100 further includes a purification mechanism 120 and a compression mechanism 130. Specifically, the purification mechanism 120 is disposed in the recovery pipeline 110, and the purification mechanism 120 can purify the gas entering the recovery pipeline 110 and filter out impurities such as nitrogen and hydraulic oil. Specifically, the proposed mechanism comprises a filtering membrane, when the mixed gas passes through the filtering membrane, only hydrogen can permeate through the filtering membrane, and impurities such as nitrogen and hydraulic oil can be discharged from a tail gas exhaust system. The purified gas is relatively pure hydrogen to meet the use requirements of the hydrogen station 400.

Further, the compression mechanism 130 is provided in the recovery line 110, and the compression mechanism 130 can pressurize the gas. The compression mechanism 130 is located between the purification mechanism 120 and the gas inlet 214, and the gas entering the recovery pipeline 110 is purified and then pressurized, thereby improving the effective energy input. After pressurization treatment, the pressure of the hydrogen can reach 5MPa to 20MPa, the pressure requirement of the hydrogen station 400 is met, and the hydrogen can be put into use again at the moment.

In the related art, when the liquid-driven piston compressor compresses hydrogen in the hydrogen station 400, due to oil-free friction between the piston and the cylinder wall of the cylinder, the hydrogen may leak to the isolation cavity in the long-term use process, and the part of hydrogen is directly discharged to the air along with the movement of the piston, so that the hydrogen waste is caused, and certain potential safety hazards exist.

In the technical scheme defined by the application, the gas recovery device 100 purifies and pressurizes the gas leaked to the isolation cavity, and finally the gas can be put into use again, so that on one hand, the waste of hydrogen is effectively avoided, and the cost is reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

In another embodiment, one end of the recycling line 110 is connected to the isolated cavity of the compressor 200, and the other end is connected to the gas inlet 214 of the compressor 200, and the gas in the isolated cavity can be put into use again through the recycling line 110 and flows back to the gas inlet 214 of the compressor 200. The gas after treatment is relatively pure hydrogen, and the pressure requirement of the hydrogen filling station 400 is met, so that the gas can be put into use again, the waste of the hydrogen is effectively avoided, and the cost is reduced.

In another embodiment, as shown in fig. 2, the air blowing device 150 is communicated with the first isolation chamber 241 through a first air path 161, the air blowing device 150 is communicated with the second isolation chamber 251 through a second air path 162, and the air blowing device 150 is used for blowing air into the first isolation chamber 241 and the second isolation chamber 251. The air blowing device 150 may be a nitrogen gas cylinder, and the air blowing device 150 blows nitrogen gas into the isolation chamber as a shielding gas. Due to oil-free friction between the piston and the cylinder wall, a part of hydrogen gas may leak into the isolation chamber and a part of hydraulic oil may leak from the cylinder into the isolation chamber through a gap of the support partition plate during long-term use. The nitrogen gas is introduced into the recovery line 110 together with the hydrogen gas and the hydraulic oil leaked into the separation chamber.

EXAMPLE III

As shown in fig. 1, the recovery line 110 includes a first line 111, a second line 112, and a third line 113. Specifically, first pipe 111 has a first end 1111 and a second end 1112, first end 1111 of first pipe 111 communicates with first isolation chamber 241 of compressor 200, second pipe 112 has a third end 1121 and a fourth end 1122, third end 1121 of second pipe 112 communicates with second isolation chamber 251 of compressor 200, third pipe 113 has a fifth end 1131 and a sixth end 1132, fifth end 1131 of third pipe 113 communicates with second end 1112 of first pipe 111, fifth end 1131 of third pipe 113 communicates with fourth end 1122 of second pipe 112, and sixth end 1132 of third pipe 113 communicates with gas inlet 214 of compressor 200. It can be understood that the first pipeline 111 and the second pipeline 112 are two branches, the first pipeline 111 and the second pipeline 112 are respectively communicated with a corresponding one of the isolated chambers, the third pipeline 113 is a merging line, the gas leaked to the first isolated chamber 241 enters the third pipeline 113 through the first pipeline 111, and the gas leaked to the second isolated chamber 251 enters the third pipeline 113 through the second pipeline 112.

Further, the purifying mechanism 120 is disposed on the third pipeline 113, the compressing mechanism 130 is disposed on the third pipeline 113, and the compressing mechanism 130 is located between the purifying mechanism 120 and the sixth end 1132. After the gas in the first isolation chamber 241 enters the third pipeline 113 through the first pipeline 111, the gas is sequentially purified and pressurized. After the gas in the second isolation chamber 251 enters the third pipeline 113 through the second pipeline 112, the gas is also sequentially purified and pressurized. The gas after treatment is relatively pure hydrogen, and the pressure requirement of the hydrogen filling station 400 is met, so that the gas can be put into use again, the waste of the hydrogen is effectively avoided, and the cost is reduced.

Example four

As shown in fig. 1, the gas recovery device 100 further includes a filter 141. Specifically, the filter 141 is disposed in the third pipeline 113 of the recycling pipeline 110, and the filter 141 is located between the fifth end 1131 of the third pipeline 113 and the purifying mechanism 120. The gas that enters into recovery pipeline 110 by the isolation chamber is before the purification, and the particle impurity in the gas can be filtered to filter 141, carries out preliminary treatment to the mist, avoids the great particle impurity of particle diameter to cause the damage to purification mechanism 120, is favorable to improving gas recovery device 100's life.

Further, the gas recovery apparatus 100 further includes a safety valve 142. Specifically, the relief valve 142 is provided in the third pipe 113 of the recovery pipe 110, and the relief valve 142 is located between the fifth end 1131 of the third pipe 113 and the filter 141, it being understood that the gas passes through the isolation chamber, the relief valve 142, the filter 141, the purification mechanism 120, the compression mechanism 130, and the gas inlet 214 in this order. The safety valve 142 is a normally closed state under the action of an external force, and prevents the medium pressure in the pipe or the device from exceeding a predetermined value by discharging the medium to the outside of the system when the medium pressure in the device or the pipe rises above a predetermined value. By providing the relief valve 142, the pressure of the gas introduced into the recovery line 110 can be controlled not to exceed a predetermined value.

It is noted that a pressure detection system, such as a pressure sensor, may be further disposed on the third pipeline 113 to achieve precise control of the pressure of the gas entering the recovery pipeline 110.

Further, the gas recovery device 100 further includes a first check valve 143. Check valves, also known as check valves or back valves, are used in hydraulic systems to prevent the reverse flow of a medium or in pneumatic systems to prevent the reverse flow of compressed air. Specifically, the first check valve 143 is disposed in the third pipeline 113, the first check valve 143 is disposed between the filter 141 and the purification mechanism 120, and the gas introduced into the recovery pipeline 110 passes through the filter 141, the first check valve 143, and the purification mechanism 120 in this order. Through setting up first check valve 143, can avoid the gas backward flow through the purification, ensure the purity of hydrogen.

Further, the gas recovery apparatus 100 further includes a first cooling mechanism 144 and a second cooling mechanism 145. Specifically, the first cooling mechanism 144 is disposed in the third pipeline 113, the first cooling mechanism 144 is disposed between the purifying mechanism 120 and the compressing mechanism 130, and the gas passes through the purifying mechanism 120, the first cooling mechanism 144, and the compressing mechanism 130 in sequence. The purification mechanism 120 heats the gas to obtain pure hydrogen after high-temperature purification, and the first cooling mechanism 144 cools the hydrogen, and when the hydrogen reaches a set temperature, the hydrogen enters the compression mechanism 130.

Further, the second cooling mechanism 145 is arranged on the third pipeline 113, the second cooling mechanism 145 is located between the compression mechanism 130 and the sixth end 1132 of the third pipeline 113, the gas sequentially passes through the compression mechanism 130, the second cooling mechanism 145 and the gas inlet 214, the compression mechanism 130 compresses and pressurizes the gas, and after the gas reaches a set pressure, the gas needs to be cooled by the second cooling mechanism 145 to meet the temperature requirement of the hydrogen filling station 400 on the hydrogen.

Further, the gas recovery device 100 further comprises a second one-way valve 146. Check valves, also known as check valves or back valves, are used in hydraulic systems to prevent the reverse flow of a medium or in pneumatic systems to prevent the reverse flow of compressed air. Specifically, the second check valve 146 is disposed on the third pipeline 113, the second check valve 146 is located between the second cooling mechanism 145 and the sixth end 1132 of the third pipeline 113, and the gas in the recovery pipeline 110 sequentially passes through the second cooling mechanism 145, the second check valve 146 and the gas inlet 214. Through setting up second check valve 146, can avoid the gas backward flow through purification, pressure boost, ensure that hydrogen is pure enough and can satisfy the pressure demand of hydrogen station 400.

Further, the gas recovery apparatus 100 further includes a buffer tank 147. Specifically, the buffer tank 147 is disposed in the third pipeline 113, the buffer tank 147 is located between the second cooling mechanism 145 and the second check valve 146, and the gas in the recovery pipeline 110 sequentially passes through the second cooling mechanism 145, the buffer tank 147 and the second check valve 146. By providing the buffer tank 147, the gas can be buffered to achieve the purpose of controlling the flow rate of the gas.

EXAMPLE five

As shown in fig. 2 and 3, a compressor 200 according to an embodiment of the present invention includes a first cylinder 210, a cylinder 220, a second cylinder 230, a first isolation section 240, a second isolation section 250, and the gas recovery device 100 according to any of the above embodiments. Wherein the first cylinder 210 is provided with an inlet port 214 and the second cylinder 230 is provided with an outlet port 234. The first isolation section 240 is provided with a first isolation cavity 241, one end of the first isolation section 240 is connected with the first cylinder 210, and the other end of the first isolation section 240 is connected with the cylinder 220. The second isolation section 250 is provided with a second isolation cavity 251, one end of the second isolation section 250 is connected with the oil cylinder 220, and the other end of the second isolation section 250 is connected with the second air cylinder 230. Specifically, the first cylinder 210 includes a first cylinder wall 211 and a first piston rod 212, the first piston rod 212 is slidably connected to the inside of the first cylinder wall 211, a first end cap 213 is disposed at one end of the first cylinder wall 211, and an air inlet 214 is disposed at the first end cap 213. Further, the second cylinder 230 includes a second cylinder wall 231 and a second piston rod 232, the second piston rod 232 is slidably connected to the inside of the second cylinder wall 231, a second end cap 233 is disposed at one end of the second cylinder wall 231, and the air outlet 234 is disposed at the second end cap 233. The cylinder 220 includes a third cylinder wall 221 and a third piston rod 222, and the third piston rod 222 is slidably connected to the inside of the third cylinder wall 221. The first piston rod 212 is inserted into the first isolation chamber 241, the second piston rod 232 is inserted into the second isolation chamber 251, one end of the third piston rod 222 is connected to the first piston rod 212, and the other end of the third piston rod 222 is connected to the second piston rod 232. When the compressor 200 works normally, hydrogen enters the first cylinder 210 through the air inlet 214, the hydraulic system drives the first piston rod 212, the second piston rod 232 and the third piston rod 222 to move, and the hydrogen in the second cylinder 230 is compressed and then discharged through the air outlet 234. By additionally arranging the first isolation section 240 between the first cylinder 210 and the oil cylinder 220 and additionally arranging the second isolation section 250 between the second cylinder 230 and the oil cylinder 220, hydrogen and hydraulic oil can be isolated.

Further, the air blowing device 150 is communicated with the first isolation chamber 241 through the first air path 161, the air blowing device 150 is communicated with the second isolation chamber 251 through the second air path 162, and the air blowing device 150 can blow air into the first isolation chamber 241 and the second isolation chamber 251. It should be noted that the air blowing device 150 may be a nitrogen cylinder, and the gas blown into the isolation chamber by the air blowing device 150 is hydrogen. Of course, the blowing device 150 may also blow other types of shielding gas into the isolated cavity.

Further, the first isolation chamber 241, the second isolation chamber 251, and the gas inlet 214 are all communicated with the recovery pipeline 110 of the gas recovery device 100. Due to oil-free friction between the piston and the cylinder wall, a part of hydrogen may leak into the isolation chamber and a part of hydraulic oil may leak from the cylinder 220 into the isolation chamber through the gap of the support diaphragm during long-term use. The blowing device 150 blows nitrogen gas as a protective gas into the isolation chamber, and the nitrogen gas communicates with the hydrogen gas and the hydraulic oil leaked into the isolation chamber and enters the recovery line 110. The mixed gas is discharged from the outlet of the isolation chamber, sequentially passes through the filter 141, the pressure detection system and the first one-way valve 143, and reaches the purifier (i.e., the purification mechanism 120), only the hydrogen can permeate the filtering membrane, and the other impurities such as nitrogen, hydraulic oil and the like are discharged from the tail gas exhaust system. The purified hydrogen purified at high temperature reaches the first cooling mechanism 144, enters the hydrogen compressor (the compression mechanism 130), reaches the pressure of the hydrogen main pipeline again (5 MPa to 20 MPa) after pressurization, then reaches the hydrogen main pipeline through the second cooling mechanism 145, the buffer tank 147 and the second one-way valve 146, and is put into use again.

EXAMPLE six

As shown in fig. 4, a hydrogen recovery method provided by an embodiment of the present invention is applied to a gas recovery device, and includes the following specific steps:

step S502, blowing nitrogen into the isolation cavity. The staff enters protective gas to the isolation chamber through the gas blowing device, and hydrogen, hydraulic oil and the like leaked to the isolation chamber through the nitrogen communication enter the recovery pipeline, so that the gas recovery device can perform subsequent process treatment on the mixed gas. Specifically, the air blowing device is communicated with the first isolation cavity through the first air path, the air blowing device is communicated with the second isolation cavity through the second air path, and air can be blown into the first isolation cavity and the second isolation cavity through the air blowing device. It is worth to be noted that the air blowing device may be a nitrogen cylinder, and the gas blown into the isolation chamber by the air blowing device is hydrogen. Of course, the air blowing device can also blow other types of protective gas into the isolation cavity;

step S504, the mixed gas entering the recovery pipeline of the gas recovery device is filtered and purified to obtain hydrogen. The recovery pipeline is located to purification mechanism, and purification mechanism can purify the gas that enters into the recovery pipeline, filters impurity such as nitrogen gas and hydraulic oil. Specifically, the proposed mechanism comprises a filtering membrane, when the mixed gas passes through the filtering membrane, only hydrogen can permeate through the filtering membrane, and impurities such as nitrogen and hydraulic oil can be discharged from a tail gas exhaust system. The purified gas is relatively pure hydrogen to meet the use requirement of the hydrogen station 400;

in step S506, the hydrogen gas is pressurized. The compression mechanism is arranged on the recovery pipeline and can compress and pressurize gas. The compression mechanism is positioned between the purification mechanism and the air inlet, and gas entering the recovery pipeline is purified and then subjected to pressurization treatment, so that effective energy input is improved. After pressurization treatment, the pressure of the hydrogen can reach 5MPa to 20MPa, the pressure requirement of the hydrogen station 400 is met, and the hydrogen can be put into use again;

in step S508, hydrogen gas is re-bubbled into the gas inlet. The gas recovery device purifies and pressurizes the gas leaked to the isolation cavity, the gas can be put into use again, and hydrogen enters the first cylinder again through the gas inlet.

EXAMPLE seven

As shown in fig. 5, an embodiment of the present invention provides a hydrogenation station 400, which includes a control mechanism 410 and a gas recovery device in any of the above embodiments, wherein the control mechanism 410 is electrically connected to the gas recovery device. The recovery pipeline of the gas recovery device purifies and pressurizes the hydrogen leaked to the isolation cavity, the protective gas and the like, and finally the pure hydrogen meeting the pressure requirement of the hydrogen filling station 400 is obtained and put into use again, so that the waste of the hydrogen is effectively avoided.

In another embodiment, as shown in fig. 6, the hydrogen refueling station 400 includes a control mechanism 410 and a compressor as in the previous embodiment, the control mechanism 410 being electrically connected to the compressor. The gas leaked to the isolation cavity in the compressor reaches a hydrogen main pipeline after purification, compression, pressurization and other treatment, and is put into use again.

In another embodiment, the hydrogen station 400 includes a control mechanism 410 and the hydrogen recovery method of the above embodiments, the hydrogen recovery method being used for the control mechanism 410. The control mechanism 410 adopts a hydrogen recovery method, and the gas leaked to the isolation cavity is subjected to purification, compression, pressurization and other treatment and then is put into use again, so that the waste of hydrogen is effectively avoided.

According to the embodiment of the gas recovery device, the compressor, the hydrogen recovery method and the hydrogen filling station, the gas blowing device blows nitrogen into the isolation cavity, the hydrogen leaked into the isolation cavity can enter the recovery pipeline along with the nitrogen, and the nitrogen is used as protective gas, so that potential safety hazards can be effectively reduced. The gas in the isolation cavity can be put into use again through the recovery pipeline, for example, the gas flows back to the gas inlet of the compressor, on one hand, the waste of hydrogen is effectively avoided, and the cost is favorably reduced; on the other hand, the potential safety hazard caused by direct discharge of hydrogen into the air is greatly reduced, and the safety performance is improved.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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.