阅读说明：本技术 一种制氮机用脱氧干燥系统 (System nitrogen machine is with deoxidation drying system ) 是由 崔文朋 林宏洪 朱泽喜 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种制氮机用脱氧干燥系统,包括一个底座、一个脱氧器、一个冷却机、两个干燥箱和一个制氮机,脱氧器、冷却机、两个干燥箱和一个制氮机从左向右依次固定安装在底座的顶端。该种制氮机用脱氧干燥系统,通过余热筒、套筒、连接管、第一阀门、进水管、第二阀门和活塞的配合使用,使人们可以将水通过进水管注入至余热筒的内部,通过脱氧器工作时产生的高温可以加热余热筒内的水,使水形成高温的蒸汽,通过连接管导入两个套筒中,提升干燥箱内部的温度,使干燥剂包内的水分受热蒸发,加快了干燥箱内部干燥剂包的干燥再生,既提升了能量的利用率,还可以提升干燥剂包的干燥再生的效率。(The invention discloses a deoxygenation drying system for a nitrogen making machine, which comprises a base, a deoxygenator, a cooler, two drying boxes and a nitrogen making machine, wherein the deoxygenator, the cooler, the two drying boxes and the nitrogen making machine are fixedly arranged at the top end of the base from left to right in sequence. This system deoxidation drying system for nitrogen machine, through a waste heat section of thick bamboo, the sleeve, the connecting pipe, first valve, the inlet tube, the cooperation of second valve and piston is used, make people can pass through the inlet tube with water and pour into the inside to a waste heat section of thick bamboo, the high temperature that produces through deoxygenator during operation can heat the water in the waste heat section of thick bamboo, make water form the steam of high temperature, in leading-in two sleeves through the connecting pipe, promote the inside temperature of drying cabinet, make the moisture evaporation of being heated in the drier package, the dry regeneration of the inside drier package of drying cabinet has been accelerated, the utilization ratio of energy has both been promoted, the dry regenerated efficiency of drier package can also be promoted.)

1. The deoxygenation drying system for the nitrogen making machine is characterized by comprising a base (1), a deoxygenator (2), a cooler (3), two drying boxes (5) and a nitrogen making machine (6), wherein the deoxygenator (2), the cooler (3), the two drying boxes (5) and the nitrogen making machine (6) are sequentially and fixedly installed at the top end of the base (1) from left to right, a waste heat recovery drying mechanism is arranged between the deoxygenator (2) and the two drying boxes (5), the waste heat recovery drying mechanism comprises a waste heat cylinder (7), two sleeves (8), two connecting pipes (9), two first valves (10), a water inlet pipe (11), a second valve (12) and two pistons (14), an air inlet pipe (30) is sleeved in the middle of one side of the waste heat cylinder (7), one end of the air inlet pipe (30) is fixedly communicated with the input end of the deoxygenator (2), the output end of the deoxygenator (2) is fixedly communicated with an air outlet pipe (13), the end part of the air outlet pipe (13) is fixedly communicated with the input end of a cooler (3), a communicating mechanism is arranged between the cooler (3) and two drying boxes (5), the communicating mechanism consists of a three-way pipe (15) and two third valves (16), five frames (19) and five drying agent bags (20) are arranged in the two drying boxes (5), the output ends of the two drying boxes (5) are respectively and fixedly communicated with pipelines (17), the end parts of the two pipelines (17) are fixedly communicated with a same filtering box (18), the filtering box (18) is fixedly arranged at the top end of the base (1), a filtering mechanism is arranged in the filtering box (18), and the filtering mechanism consists of a rectangular plate (21), a sealing ring (22) and five filtering screens (23), the device is characterized in that a transmission mechanism is arranged on one side of the filter box (18), the transmission mechanism is composed of two fixed blocks (24), a threaded rod (25), a movable block (26), a connecting rod (27), a connecting block (28) and two balls (4), a round pipe (29) is fixedly communicated with the bottom of one side of the connecting block (28), the other end of the round pipe (29) is fixedly communicated with the input end of the nitrogen making machine (6), the deoxygenator (2) is electrically connected with an external power supply through a control panel on the deoxygenator, the cooler (3) is electrically connected with the external power supply through a control panel on the cooler, and the nitrogen making machine (6) is electrically connected with the external power supply through a control panel on the nitrogen making machine.

2. The deoxidation drying system for the nitrogen making machine according to claim 1, wherein the waste heat cylinder (7) is fixedly installed in the middle of the deoxygenator (2), the two sleeves (8) are respectively fixedly installed outside the two drying boxes (5), one end of each of the two connecting pipes (9) is respectively fixedly communicated with the tops of the two sides of the waste heat cylinder (7), the other end of each of the two connecting pipes (9) is respectively fixedly communicated with the tops of one side of the two sleeves (8), and the two first valves (10) are respectively fixedly installed at the ends of the two connecting pipes (9).

3. The deoxidation and drying system for the nitrogen making machine according to claim 1, wherein one end of the water inlet pipe (11) is fixedly communicated with the top of one side of the waste heat cylinder (7), the second valve (12) is fixedly installed in the middle of the water inlet pipe (11), and the two pistons (14) are respectively connected with the tops of one sides of the two sleeves (8) in an inserting manner.

4. The deoxidation drying system for nitrogen making machine according to claim 1, wherein one end of said three-way pipe (15) is fixedly connected with the output end of the cooler (3), two output ends of said three-way pipe (15) are respectively fixedly connected with the input ends of two drying boxes (5), and two said third valves (16) are respectively fixedly mounted at the output ends of two three-way pipes (15).

5. The deoxidation and drying system for the nitrogen making machine according to claim 1, wherein five frames (19) are fixedly installed inside the drying box (5) at equal intervals, five desiccant bags (20) are respectively sleeved inside the five frames (19), and the bottom ends of the five frames (19) are provided with a plurality of through holes.

6. The deoxidation drying system for a nitrogen making machine according to claim 1, wherein one side of each of the five filter screens (23) is fixedly connected with one side of the rectangular plate (21), and the outer parts of the five filter screens (23) are inserted and connected with the inner part of the filter box (18).

7. The deoxidation and drying system for the nitrogen making machine according to claim 1, wherein the sealing rings (22) are sleeved outside the five filter screens (23), the front surfaces of the sealing rings (22) are attached to the back surfaces of the rectangular plates (21), and the back surfaces of the sealing rings (22) are attached to the front surfaces of the filter boxes (18).

8. The deoxidation drying system for the nitrogen making machine according to claim 1, wherein one side of the two fixed blocks (24) is fixedly connected with two ends of one side of the filter box (18), two ends of the threaded rod (25) are respectively connected with the middle part of the fixed blocks (24) through bearings, and the middle part of the movable block (26) is in threaded connection with the outer part of the threaded rod (25).

9. The deoxidation and drying system for nitrogen making machine according to claim 1, wherein the two balls (4) are sleeved on one side of the movable block (26), and the outer parts of the two balls (4) are slidably connected with one side of the filter box (18).

10. The deoxidation drying system for nitrogen making machine according to claim 1, wherein the front face of the movable block (26) is fixedly connected with one end of a connecting rod (27), one end of the connecting rod (27) is fixedly connected with one side of a connecting block (28), and the end of the connecting block (28) is fixedly connected with the middle part of one side of the rectangular plate (21).

Technical Field

The invention relates to a deoxidation drying system, in particular to a deoxidation drying system for a nitrogen making machine.

Background

The nitrogen making machine is a nitrogen making device which is designed and manufactured according to the pressure swing adsorption technology, and the nitrogen making machine uses a high-quality imported carbon molecular sieve as an adsorbent and adopts the pressure swing adsorption principle at normal temperature to separate air to prepare high-purity nitrogen.

At present, the air needs to be deoxidized and dried in the production process of nitrogen, but the existing deoxidizing and drying system of the nitrogen making machine still has the following problems: 1. the energy consumption is high, and the energy utilization rate is low; 2. the dryer inner drying agent bag adopts natural drying regeneration, and the efficiency is low. Therefore, we improve the method and propose a deoxidation drying system for a nitrogen making machine.

Disclosure of Invention

The invention relates to a deoxygenation drying system for a nitrogen making machine, which comprises a base, a deoxygenator, a cooler, two drying boxes and a nitrogen making machine, wherein the deoxygenator, the cooler, the two drying boxes and the nitrogen making machine are sequentially and fixedly arranged at the top end of the base from left to right, a waste heat recovery drying mechanism is arranged between the deoxygenator and the two drying boxes and consists of a waste heat cylinder, two sleeves, two connecting pipes, two first valves, a water inlet pipe, a second valve and two pistons, an air inlet pipe is sleeved in the middle of one side of the waste heat cylinder, one end of the air inlet pipe is fixedly communicated with the input end of the deoxygenator, an air outlet pipe is fixedly communicated with the output end of the deoxygenator, the end part of the air outlet pipe is fixedly communicated with the input end of the cooler, and a communicating mechanism is arranged between the cooler and the two drying boxes, the communicating mechanism consists of a three-way pipe and two third valves, five frames and five drying agent bags are arranged in each of the two drying boxes, pipelines are fixedly communicated with the output ends of the two drying boxes respectively, the end parts of the two pipelines are fixedly communicated with the same filtering box, the filtering box is fixedly arranged at the top end of the base, a filtering mechanism is arranged in the filtering box and consists of a rectangular plate, a sealing ring and five filtering screens, a transmission mechanism is arranged on one side of the filtering box and consists of two fixed blocks, a threaded rod, a movable block, a connecting rod, a connecting block and two balls, a round pipe is fixedly communicated with the bottom of one side of the connecting block, the other end of the round pipe is fixedly communicated with the input end of the nitrogen making machine, and the deoxygenator is electrically connected with an external power supply through a control panel on the deoxygenator, the cooling machine is electrically connected with an external power supply through a control panel on the cooling machine, and the nitrogen making machine is electrically connected with the external power supply through the control panel on the nitrogen making machine.

As a preferred technical scheme of the invention, the waste heat cylinder is fixedly arranged in the middle of the deoxygenator, the two sleeves are respectively and fixedly arranged outside the two drying boxes, one end of each of the two connecting pipes is respectively and fixedly communicated with the tops of the two sides of the waste heat cylinder, the other end of each of the two connecting pipes is respectively and fixedly communicated with the top of one side of each of the two sleeves, and the two first valves are respectively and fixedly arranged at the end parts of the two connecting pipes.

As a preferable technical scheme of the invention, one end of the water inlet pipe is fixedly communicated with the top of one side of the waste heat cylinder, the second valve is fixedly arranged in the middle of the water inlet pipe, and the two pistons are respectively connected with the tops of one sides of the two sleeves in an inserting manner.

As a preferred technical scheme of the invention, one end of the three-way pipe is fixedly communicated with the output end of the cooler, two output ends of the three-way pipe are respectively and fixedly communicated with the input ends of the two drying boxes, and the two third valves are respectively and fixedly arranged at the output ends of the two three-way pipes.

As a preferable technical scheme of the invention, the five frames are fixedly arranged in the drying box at equal intervals, the five drying agent bags are respectively sleeved in the five frames, and the bottom ends of the five frames are provided with a plurality of through holes.

As a preferable technical scheme of the invention, one side of each of the five filter screens is fixedly connected with one side of the rectangular plate, and the outer parts of the five filter screens are inserted and connected with the inner part of the filter box.

As a preferred technical scheme of the invention, the sealing ring is sleeved outside the five filter screens, the front surface of the sealing ring is attached to the back surface of the rectangular plate, and the back surface of the sealing ring is attached to the front surface of the filter box.

As a preferred technical scheme of the invention, one side of each of the two fixed blocks is fixedly connected with two ends of one side of the filter box, two ends of the threaded rod are respectively connected with the middle parts of the fixed blocks through bearings, and the middle parts of the movable blocks are in threaded connection with the outer parts of the threaded rod.

As a preferred technical scheme of the invention, the two balls are sleeved on one side of the movable block, and the outer parts of the two balls are in sliding connection with one side of the filter box.

As a preferable technical scheme of the invention, the front face of the movable block is fixedly connected with one end of the connecting rod, one end of the connecting rod is fixedly connected with one side of the connecting block, and the end part of the connecting block is fixedly connected with the middle part of one side of the rectangular plate.

The invention has the beneficial effects that:

1. this system deoxidation drying system for nitrogen machine, through a waste heat section of thick bamboo, the sleeve, the connecting pipe, first valve, the inlet tube, the cooperation of second valve and piston is used, make people can pass through the inlet tube with water and pour into the inside to a waste heat section of thick bamboo, the high temperature that produces through deoxygenator during operation can heat the water in the waste heat section of thick bamboo, make water form the steam of high temperature, in leading-in two sleeves through the connecting pipe, promote the inside temperature of drying cabinet, make the moisture evaporation of being heated in the drier package, the dry regeneration of the inside drier package of drying cabinet has been accelerated, the utilization ratio of energy has both been promoted, the dry regenerated efficiency of drier package can also be promoted.

2. The deoxidation drying system for the nitrogen making machine can ensure that people can respectively control the opening and closing of the two third valves through the matching use of the third valves and the three-way pipe, so that gas can only be introduced into one drying box, and when moisture absorbed by a drying agent bag in the drying box reaches saturation and needs drying regeneration, the gas can be controlled to be introduced into the other drying box, so that the two drying boxes work circularly, the working efficiency is improved,

3. this system deoxidation drying system for nitrogen machine can carry out the multiple stage filtration to the impurity in the gas through five filter screens, has promoted and has let in the gaseous quality in the nitrogen machine to cooperation through fixed block, threaded rod, movable block, connecting rod, connecting block and ball is used, makes people can pass through the rotation threaded rod, makes movable block, connecting rod and connecting block remove, and drives the rectangular plate and removes, makes the filter screen to in the rose box that people can relax clean, has promoted the practicality.

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 structural diagram of a deoxidation drying system for a nitrogen making machine according to the present invention;

FIG. 2 is a schematic structural diagram of a three-way pipe of the deoxidation drying system for the nitrogen making machine of the invention;

FIG. 3 is a schematic diagram of the internal structure of a drying box of the deoxidation drying system for the nitrogen making machine of the invention;

FIG. 4 is a schematic diagram of a filter box of the deoxidation drying system for the nitrogen making machine in a top view;

FIG. 5 is a schematic diagram of a movable block structure of the deoxidation drying system for the nitrogen making machine according to the invention.

FIG. 6 is a schematic diagram of a waste heat drum structure of a deoxidation drying system for a nitrogen making machine according to the present invention

FIG. 7 is a schematic view of a rectangular plate structure of the deoxidation drying system for nitrogen making machine according to the present invention

In the figure: 1. a base; 2. a deoxygenator; 3. a cooling machine; 4. a ball bearing; 5. a drying oven; 6. a nitrogen making machine; 7. a waste heat cylinder; 8. a sleeve; 9. a connecting pipe; 10. a first valve; 11. a water inlet pipe; 12. a second valve; 13. an air outlet pipe; 14. a piston; 15. a three-way pipe; 16. a third valve; 17. a pipeline; 18. a filter box; 19. a frame; 20. a desiccant bag; 21. a rectangular plate; 22. a seal ring; 23. filtering with a screen; 24. a fixed block; 25. a threaded rod; 26. a movable block; 27. a connecting rod; 28. connecting blocks; 29. a pipeline; 30. an air inlet pipe.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Example (b): as shown in fig. 1, 2, 3, 4, 5, 6 and 7, the deoxidation drying system for nitrogen making machine of the invention comprises a base 1, a deoxygenator 2, a cooling machine 3, two drying boxes 5 and a nitrogen making machine 6, wherein the deoxygenator 2, the cooling machine 3, the two drying boxes 5 and the nitrogen making machine 6 are sequentially and fixedly installed at the top end of the base 1 from left to right, a waste heat recovery drying mechanism is arranged between the deoxygenator 2 and the two drying boxes 5, the waste heat recovery drying mechanism comprises a waste heat cylinder 7, two sleeves 8, two connecting pipes 9, two first valves 10, a water inlet pipe 11, a second valve 12 and two pistons 14, an air inlet pipe 30 is sleeved at the middle part of one side of the waste heat cylinder 7, one end of the air inlet pipe 30 is fixedly communicated with the input end of the deoxygenator 2, an air outlet pipe 13 is fixedly communicated with the output end of the deoxygenator 2, the end part of the air outlet pipe 13 is fixedly communicated with the input end of the cooler 3, a communicating mechanism is arranged between the cooler 3 and the two drying boxes 5, the communicating mechanism consists of a three-way pipe 15 and two third valves 16, the interior of the two drying boxes 5 is respectively provided with five frames 19 and five drying agent bags 20, the output ends of the two drying boxes 5 are respectively fixedly communicated with a pipeline 17, the end parts of the two pipelines 17 are fixedly communicated with a same filter box 18, the filter box 18 is fixedly arranged at the top end of the base 1, the interior of the filter box 18 is provided with a filtering mechanism, the filtering mechanism consists of a rectangular plate 21, a sealing ring 22 and five filter screens 23, one side of the filter box 18 is provided with a transmission mechanism, the transmission mechanism consists of two fixed blocks 24, a threaded rod 25, a movable block 26, a connecting rod 27, a connecting block 28 and two balls 4, the bottom part of one side of the connecting block, the other end of the circular tube 29 is fixedly communicated with the input end of the nitrogen making machine 6, the deoxygenator 2 is electrically connected with an external power supply through a control panel on the deoxygenator, the cooler 3 is electrically connected with the external power supply through a control panel on the cooler, and the nitrogen making machine 6 is electrically connected with the external power supply through a control panel on the cooler.

Wherein, the waste heat cylinder 7 is fixedly arranged in the middle of the deoxygenator 2, the two sleeves 8 are respectively and fixedly arranged outside the two drying boxes 5, one end of each connecting pipe 9 is respectively and fixedly communicated with the tops of two sides of the waste heat cylinder 7, the other end of each connecting pipe 9 is respectively and fixedly communicated with the top of one side of each sleeve 8, the two first valves 10 are respectively and fixedly arranged at the end parts of the two connecting pipes 9, water can be injected into the waste heat cylinder 7 through the water inlet pipe 11 by matching the waste heat cylinder 7, the sleeves 8, the connecting pipes 9, the first valves 10, the water inlet pipe 11, the second valve 12 and the piston 14, water in the waste heat cylinder 7 can be heated by high temperature generated during the work of the deoxygenator 2, the water forms high-temperature steam, the steam is guided into the two sleeves 8 through the connecting pipes 9, the temperature in the drying boxes 5 is raised, and the moisture in the drying agent bags, the drying regeneration of the drying agent bag 20 in the drying box 5 is accelerated, the utilization rate of energy is improved, and the drying regeneration efficiency of the drying agent bag 20 can also be improved.

Wherein, the fixed intercommunication in top of the one end of inlet tube 11 and waste heat section of thick bamboo 7 one side, second valve 12 fixed mounting is at the middle part of inlet tube 11, two pistons 14 respectively with the top interlude of two sleeve 8 one sides be connected, through two pistons 14, make people extract two pistons 14 backs, high temperature steam in two sleeves 8 can discharge through the junction of piston 14 with sleeve 8, make the atmospheric pressure in sleeve 8 and the waste heat section of thick bamboo 7 can remain stable, make steam can let in the sleeve 8.

Wherein, the one end of three-way pipe 15 is fixed with the output of cooler 3 and is linked together, two output of three-way pipe 15 are fixed with the input of two drying cabinets 5 respectively and are linked together, two third valves 16 are fixed mounting respectively at the output of two three-way pipes 15, use through the cooperation of third valve 16 and three-way pipe 15, make people can control the switching of two third valves 16 respectively, make gas only let in one of them drying cabinets 5, and when the moisture that drying agent package 20 absorbed reaches saturation needs dry regeneration in drying cabinet 5, can control gas and let in another drying cabinet 5, make the work of two drying cabinets 5 circulations, work efficiency has been promoted.

The five frames 19 are fixedly arranged in the drying box 5 at equal intervals, the five drying agent bags 20 are respectively sleeved in the five frames 19, and the bottom ends of the five frames 19 are provided with a plurality of through holes through which air can pass to contact with the drying agent bags 20.

Wherein, one side of five filter screens 23 all with one side fixed connection of rectangular plate 21, the outside of five filter screens 23 all with the inside interlude of rose box 18 be connected, can filter the impurity in the gas through filter screen 23, promoted the quality that lets in gas in the nitrogen generator 6.

The sealing ring 22 is sleeved outside the five filter screens 23, the front surface of the sealing ring 22 is attached to the back surface of the rectangular plate 21, the back surface of the sealing ring 22 is attached to the front surface of the filter box 18, and internal gas in the filter box 18 is not easy to flow out through a gap between the rectangular plate 21 and the filter box 18 through the sealing ring 22.

Wherein, one side of two fixed blocks 24 respectively with the both ends fixed connection of rose box 18 one side, the both ends of threaded rod 25 are connected with the middle part of fixed block 24 through the bearing respectively, the middle part of movable block 26 and the outside threaded connection of threaded rod 25, through fixed block 24, threaded rod 25, movable block 26, connecting rod 27, connecting block 28 and ball 4's cooperation is used, make people can pass through rotation threaded rod 25, make movable block 26, connecting rod 27 and connecting block 28 remove, and drive rectangular plate 21 and remove, make the filter screen 23 to in the rose box 18 that people can relax clean, the practicality has been promoted.

Wherein, two balls 4 all overlap and establish the one side at movable block 26, and the outside of two balls 4 all with one side sliding connection of rose box 18, through ball 4, when making threaded rod 25 rotate, movable block 26 can only remove and can not rotate to can make the steady removal of movable block 26.

Wherein, the front of movable block 26 and the one end fixed connection of connecting rod 27, the one end of connecting rod 27 and one side fixed connection of connecting block 28, the middle part fixed connection of the tip of connecting block 28 and one side of rectangular plate 21, through the connection of connecting rod 27 and connecting block 28, can drive rectangular plate 21 when making movable block 26 remove.

When the device works, the second valve 12 is opened firstly, water is introduced into the interior of the waste heat cylinder 7 through the water inlet pipe 11, when the water surface is positioned at three quarters of the height of the waste heat cylinder 7, water injection is stopped, the second valve 12 is closed, the water surface is positioned below the connecting pipe 9, the power supply of the deoxygenator 2, the cooler 3 and the nitrogen generator 6 is opened, air is injected into the deoxygenator 2 through the air inlet pipe for deoxygenation, the air enters the interior of the cooler 3 through the air outlet pipe 13 for cooling after the deoxygenation of the air is finished, one of the third valves 16 is opened according to the use condition, the air is introduced into one of the drying boxes 5 through the three-way pipe 15 after the cooling of the air is finished, the air passes through the five drying agent bags 20, moisture in the air is absorbed by the drying agent bags 20, the dried air enters the interior 18 of the filter box through the pipeline 17, the air passes through the five filter screens 23, after filtration, air enters the nitrogen making machine 6 through the circular tube 29 to perform a nitrogen making process, one of the first valves 10 is opened, the high temperature generated when the deoxygenator 2 works can heat the water in the waste heat cylinder 7, so that the water forms high-temperature steam, the high-temperature steam is introduced into one of the sleeves 8 through one of the connecting tubes 9, the temperature in the drying box 5 which is not in a working state is raised, the moisture in the drying agent package 20 is heated and evaporated, the drying and regeneration of the drying agent package 20 in the drying box 5 are accelerated, the piston 14 is removed, the steam can be discharged out of the sleeve 8, when the moisture absorbed by the drying agent package 20 in one of the drying boxes 5 is saturated, one of the third valves 16 is closed, the other third valve 16 is opened, the air is introduced into the other drying box 5, one of the first valves 10 is closed, the other first valve 10 is opened, make steam let in the inside of not being in waste heat section of thick bamboo 7 on operating condition drying cabinet 5 this moment, after the nitrogen making finishes, close the power of deoxygenator 2, cooler 3 and nitrogen making machine 6, rotate threaded rod 25, make movable block 26, connecting rod 27 and connecting block 28 remove, the connecting block drives rectangular plate 21 and removes, makes filter screen 23 break away from the inside of rose box 18, cleans the impurity on the filter screen 23.

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.