Nitrogen sealing device of piston type compressor for extracting helium from BOG (Boil Off Gas)

Abstract

The utility model belongs to the related technical field of compressors, and particularly relates to a BOG helium extraction piston type compressor nitrogen sealing device which comprises a sealing box, a piston rod is connected in the sealing box in a sliding mode, the sealing box is connected with an impurity removal assembly through a flange, the impurity removal assembly comprises a cylindrical barrel, and a through hole for the piston rod to penetrate through is formed in a shell in the axial direction. The shell is provided with impurity removal channels communicating with the through holes, spoilers are installed between the impurity removal channels, and impurity removal materials are arranged between the impurity removal channels; the cylinder body is divided into an inner cylinder body and an outer cylinder body by the shape gap, and the two parts of the cylinder body are connected through a columnar connecting rod; by arranging the impurity removing assembly, impurity removing is conducted on gas entering the sealing box, too many impurities cannot enter the sealing box within a certain time, damage of the impurities to sealing filler in the sealing box is reduced, cleaning and overhauling of the sealing box can be reduced, and therefore the service life of the sealing box can be prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of compressor-related technical technology, specifically relating to a nitrogen sealing device for a BOG helium-lifting piston compressor. Background Technology

[0002] Compressors are a commonly used type of compression equipment in industrial production. Since the packing transmission components come into contact with the gas during operation, a certain amount of nitrogen is usually filled into the packing chamber to protect the packing, prevent partial corrosion of the packing, and reduce leakage. This is called packing protection nitrogen. The main function of packing protection nitrogen is to protect the packing and prevent it from contacting harmful gases and causing corrosion.

[0003] Utility model announcement number 221277954U discloses a nitrogen protection device for intermediate packing of a compressor, including a fixed base, a compressor body, and an inlet pipe. The compressor body is mounted on the fixed base, and the inlet pipe is provided on the compressor body. It also includes a piston rod disposed inside the compressor body. A first packing assembly and a second packing assembly are also disposed inside the compressor body, with the first packing assembly located to the right of the second packing assembly. A blocking structure is provided to the left of the second packing assembly to facilitate the blocking of incoming gas. In this nitrogen protection device for intermediate packing of a compressor, the first and second packing assemblies are disposed inside the compressor body, and both the first and second packing assemblies are in close contact with the outer wall of the piston rod, and both the first and second packing assemblies are annular.

[0004] However, in the aforementioned patent, impurities in the air can also enter the sealing box through the gap between the sealing box and the piston rod, contaminating the sealing packing and affecting the normal performance of the sealing box. It is necessary to inspect and clean the packing or structure inside the sealing box in a short period of time, which is complicated and may cause wear to the packing box, affecting the normal use of the sealing box. Utility Model Content

[0005] The purpose of this invention is to provide a nitrogen sealing device for a BOG helium-lifting reciprocating compressor to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0007] A nitrogen sealing device for a BOG helium extraction piston compressor, comprising a sealing box, a piston rod is slidably connected in the sealing box, characterized in that the sealing box is connected with a impurity removal assembly through a flange, the impurity removal assembly comprises a cylinder body, the cylinder body is fixedly connected with the sealing box, the cylinder body is axially provided with a through hole for the piston rod to pass through, the through hole is slidably connected with the piston rod, the cylinder body is provided with an impurity removal channel in communication with the through hole, the impurity removal channel divides the cylinder body into two parts, the inner part is an inner cylinder body, and the outer part is an outer cylinder body, the cylinder bodies are fixedly connected through a columnar connecting rod; a plurality of spoiler plates are installed in the impurity removal channel in a staggered manner, the plurality of spoiler plates are fixedly connected with the inner cylinder body or the outer cylinder body, the impurity removal channel is provided with impurity removal material; two sealing rings are installed between the outer cylinder body and the piston rod, the two sealing rings are located on the two sides of the impurity removal channel, and the inner cylinder body is provided with a sealing ring in slidable connection with the piston rod; and the outer cylinder body is provided with a cooling mechanism.

[0008] As an improvement, the cooling mechanism comprises a cavity arranged in the outer cylinder body, a cooling liquid inlet is arranged at the bottom of the outer cylinder body and in communication with the cavity, and a cooling liquid outlet is arranged at the top of the outer cylinder body and in communication with the cavity.

[0009] As an improvement, the sealing box comprises a shell, a pressing plate is connected to one end of the shell through bolts and nuts, a bottom plate is fixedly connected to the other end of the shell, a filler box type I, four filler box type II, a filler box type III and a filler box type VI are sequentially installed in the shell, and the filler box type I, the filler box type II, the filler box type III and the filler box type VI are sequentially and alternately abutted.

[0010] As an improvement, a flow resistance ring is installed in the filler box type I and slidably connected with the piston rod, a main sealing filler is installed in the filler box type II and slidably connected with the piston rod, a secondary sealing filler is installed in the filler box type III, and a secondary filler seal is installed in the filler box type VI and slidably connected with the piston rod.

[0011] As an improvement, a first nitrogen channel is arranged in the pressing plate, the filler box type III and the filler box type VI in cooperation, one end of the first nitrogen channel is in communication with a through hole of the shell at a side of the filler box type III close to the filler box type II, the other end of the first nitrogen channel is in communication with the outside of the shell, and a filler gas extraction port in communication with the first nitrogen channel is arranged on the pressing plate.

[0012] As an improvement, a second nitrogen passage is arranged in the pressing plate, the filler box III type and the filler box VI type, one end of the second nitrogen passage is communicated with the through hole of the shell at the side of the filler box VI type close to the filler box III type, the other end of the second nitrogen passage is communicated with the outside of the shell, the pressing plate is provided with a filler gas filling port communicated with the second nitrogen passage, and a self-operated pressure regulating valve is arranged on the filler gas filling port.

[0013] As an improvement, the bottom plate is abutted with the filler box I type, and an O I type sealing ring is arranged between the bottom plate and the filler box I type.

[0014] As an improvement, the main sealing filler and the auxiliary sealing filler are peripherally connected with springs.

[0015] Due to the above technical scheme, the utility model has the advantages of:

[0016] The BOG helium extraction piston type compressor nitrogen sealing device provided by the utility model has the advantages that the impurity removing assembly is arranged, the gas entering the sealing cavity is removed of impurities, too many impurities cannot enter the sealing cavity in a short time, the damage of the impurities to the sealing filler in the sealing cavity is reduced, the cleaning and maintenance of the sealing cavity can be reduced, and the service life of the sealing cavity can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is the overall structure schematic view of the utility model;

[0018] Fig. 2 is the internal structure schematic view of the utility model.

[0019] 1, auxiliary sealing filler; 2, filler gas outlet; 3, filler box IV type; 4, first nitrogen passage; 5, piston rod; 6, second nitrogen passage; 7, pressing plate; 8, filler nitrogen filling port; 9, shell; 10, flow resistance ring; 11, cooling liquid inlet; 12, cavity; 13, inner cylinder; 14, outer cylinder; 15, impurity removing passage; 16, spoiler; 17, bottom plate; 18, cooling liquid outlet; 19, O I type sealing ring; 20, O II type sealing ring; 21, filler box I type; 22, filler box II type; 23, main sealing filler; 24, filler box III type; 25, impurity removing assembly; 251, cylinder; 91, sealing cavity. DETAILED DESCRIPTION

[0020] The utility model is further described below in combination with specific embodiments and drawings. The drawings are only used for illustrative description, and the representation is a schematic diagram rather than a physical diagram, and should not be understood as a limitation on the present application; in order to better illustrate the embodiments of the utility model, some components in the drawings are omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted.

[0021] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it should be understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore the terms describing the position relationship in the drawings are only used for illustrative description, and should not be understood as a limitation on the present application, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] As shown in the drawings, Figs. 1-2 As shown in the drawings,

[0023] In the embodiment, when the piston rod 5 moves, the piston rod 5 drives the piston to reciprocate, so that the pressure in the cylinder changes, and the pressure received by the impurity removal assembly 25 changes; when the pressure is too large, the gas cylinder enters the inside of the impurity removal assembly 25 from between the outer cylinder 14 and the piston rod 5; since the resistance between the impurity removal channels 15 is small, the gas mostly flows from the impurity removal channels 15; when flowing between the impurity removal channels 15, most of the impurities contained in the gas are adsorbed by the impurity removal material, so that there are no too many impurities in the gas flowing to the sealing box 91, thereby reducing the pollution of the sealing box 91, prolonging the service life of the sealing box 91, and reducing the maintenance frequency of the sealing box 91.

[0024] The outer cylinder 14 is provided with two sealing rings in sliding connection with the piston rod 5, and the inner cylinder 13 is provided with one sealing ring in sliding connection with the piston rod 5, so that the gas cannot enter the degassing assembly 25 when the pressure is low.

[0025] The outer cylinder 14 is provided with a cooling mechanism, which can cool the connection between the piston rod 5 and the outer cylinder 14, thereby ensuring the normal performance of the sealing ring.

[0026] The cooling mechanism includes a cavity 12 arranged in the outer cylinder 14, a cooling liquid inlet 11 arranged at the bottom of the outer cylinder 14 and in communication with the cavity 12, and a cooling liquid outlet 18 arranged at the top of the outer cylinder 14 and in communication with the cavity 12. The cooling liquid inlet 11 and the cooling liquid outlet 18 are both provided with control valves. The control valve of the cooling liquid inlet 11 is connected with a cooling liquid input pipeline, and the control valve of the cooling liquid outlet 18 is connected with a cooling liquid output pipeline. The cooling liquid inlet 11 can input cooling liquid into the cavity 12 through the cooling liquid input pipeline, and the cooling liquid outlet 18 can extract the cooling liquid in the cavity 12 through the cooling liquid output pipeline, thereby realizing the circulation of the cooling liquid and achieving continuous cooling.

[0027] The sealing box 91 includes a shell 9, one end of the shell 9 is connected with a pressing plate 7 through bolts and nuts, the other end of the shell 9 is fixedly connected with a bottom plate 17, and a filler box I type 21, four filler boxes II type 22, a filler box III type 24 and a filler box VI type are sequentially arranged in the shell 9. The filler box I type 21, the four filler boxes II type 22, the filler box III type 24 and the filler box VI type are sequentially and alternately abutted.

[0028] The flow resistance ring 10 is arranged in the filler box I type 21 and is in sliding connection with the piston rod 5. The filler box I type 21 is used for containing the flow resistance ring 10. The flow resistance ring 10 uniformly distributes and depressurizes the gas leaked from the cylinder along the piston rod 5.

[0029] The main sealing filler 23 is arranged in the filler box II type 22 and is in sliding connection with the piston rod 5. Each filler box II type 22 contains a pair of main sealing fillers 23, and the pair of main sealing fillers 23 are fixed together by a positioning pin. One of the main sealing fillers 23 is composed of two petals, and the other is composed of three petals. The outer periphery of each main sealing filler 23 is fastened by a spring. The main sealing filler 23 gradually depressurizes and seals the gas leaked from the flow resistance ring 10.

[0030] The auxiliary sealing filler 1 is arranged in the filler box III type 24. The filler box III type 24 collects the gas leaked along the main sealing filler 23 and the piston rod 5 and guides the gas to the filler air outlet 2.

[0031] The filler box Ⅵ type is internally provided with a secondary sealing filler, the secondary sealing filler 1 is in sliding connection with the piston rod 5, the filler box Ⅳ type 3 has the following functions: it is used for containing the secondary sealing filler 1, each filler box Ⅳ type 3 is internally provided with a pair of secondary sealing fillers 1, and the pair of secondary sealing fillers 1 are fixed together by a positioning pin, one of the secondary sealing fillers 1 is composed of two parts, and the other secondary sealing filler 1 is composed of three parts, and the outer periphery of each secondary sealing filler 1 is fastened by a spring; the filler box Ⅳ type 3 has the following functions: the secondary sealing filler 1 seals the gas leaked from the sealing filler, so that the gas is not leaked to the crankcase along the transmission rod, and the gas is guided to the filler gas outlet 2.

[0032] The first nitrogen channel 4 is internally matched with the pressing plate 7, the filler box Ⅲ type 24 and the filler box Ⅵ type, one end of the first nitrogen channel 4 is in communication with the through hole of the shell 9 at the side of the filler box Ⅲ type 24 close to the filler box Ⅱ type 22, the other end of the first nitrogen channel 4 is in communication with the outside of the shell 9, and the filler gas outlet 2 of the first nitrogen channel 4 is arranged on the pressing plate 7.

[0033] The second nitrogen channel 6 is internally matched with the pressing plate 7, the filler box Ⅲ type 24 and the filler box Ⅵ type, one end of the second nitrogen channel 6 is in communication with the through hole of the shell 9 at the side of the filler box Ⅵ type close to the filler box Ⅲ type 24, the other end of the second nitrogen channel 6 is in communication with the outside of the shell 9, and the filler gas inlet of the second nitrogen channel 6 is arranged on the pressing plate 7, and a self-operated pressure regulating valve is arranged on the filler gas inlet.

[0034] The bottom plate 17 is in abutment with the filler box Ⅰ type 21, and an "O" Ⅰ type sealing ring is arranged between the bottom plate 17 and the filler box Ⅰ type 21, and an "O" Ⅱ type sealing ring is connected to the outer periphery of the shell 9, the "O" Ⅰ type sealing ring and the "O" Ⅱ type sealing ring are respectively soft sealing rubber rings in the shape of O, and have the function of fastening and sealing.

[0035] The outer peripheries of the main sealing filler 23 and the secondary sealing filler 1 are connected with springs, and the springs can make the main sealing filler 23 and the secondary sealing filler 1 more closely connected with the piston rod 5.

[0036] In summary, in actual use, the gas leaking out along the piston rod 5 from the cylinder first passes through the impurity removal assembly 25 to reduce the pressure, and after the gas passes through the impurity removal channel 15 in the impurity removal assembly 25 and most of the impurities are removed by the impurity removal material, the gas enters the packing box I type 21, is divided and reduced in pressure by the flow resistance ring 10 inside, and then gradually enters the packing box II, is gradually throttled and reduced in pressure by the main sealing packing 23 inside, and the gas leaking out along the piston rod 5 and the main sealing packing 23 is basically zero. However, with the extension of the use time, the gas flow leaking out along the piston rod 5 will increase due to the wear, deformation or powder impurities of the packing, and at this time, the gas will enter the packing box III type 24, and the gas leaking out along the main packing and the piston rod 5 is collected and mixed with the nitrogen from the packing nitrogen filling port 8, and then enters the packing box IV type 3 along the channel and enters the packing gas extraction port 2. In addition, the auxiliary sealing packing 1 in the packing box IV type 3 seals the gas leaking out along the piston rod 5 to prevent the gas from leaking into the crankcase.

[0037] The specific implementation of the utility model described above does not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A nitrogen sealing device for a BOG helium extraction piston compressor, comprising a sealing box (91), a piston rod (5) is slidably connected in the sealing box (91), characterized in that, The sealing box (91) is connected with the impurity removal assembly (25) through the flange, the impurity removal assembly (25) comprises a cylinder body (251), the cylinder body (251) is fixedly connected with the sealing box (91), the cylinder body (251) is axially provided with a through hole for the piston rod (5) to pass through, the through hole is in sliding connection with the piston rod (5), the cylinder body (251) is provided with an impurity removal channel (15) in communication with the through hole, the impurity removal channel (15) divides the cylinder body (251) into two parts, wherein the inner part is an inner cylinder body (13), and the outer part is an outer cylinder body (14), and the cylinder body (251) is fixedly connected through a columnar connecting rod; The impurity removal channel (15) is provided with a plurality of staggered baffles (16), the baffles (16) are fixedly connected with the inner cylinder body (13) or the outer cylinder body (14), and the impurity removal channel (15) is provided with impurity removal materials; Two sealing rings are arranged between the outer cylinder body (14) and the piston rod (5), the two sealing rings are located on the two sides of the impurity removal channel (15), and the inner cylinder body (13) is provided with a sealing ring in sliding connection with the piston rod (5); The outer cylinder body (14) is provided with a cooling mechanism.

2. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 1, wherein, The cooling mechanism comprises a cavity (12), the cavity (12) is arranged in the outer cylinder body (14), the bottom of the outer cylinder body (14) is provided with a cooling liquid inlet (11) in communication with the cavity (12), and the top of the outer cylinder body (14) is provided with a cooling liquid outlet (18) in communication with the cavity (12).

3. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 1, wherein, The sealing box (91) comprises a shell (9), one end of the shell (9) is connected with a pressing plate (7) through bolts and nuts, the other end of the shell (9) is fixedly connected with a bottom plate (17), a filler box I type (21), four filler boxes II type (22), a filler box III type (24) and a filler box VI type are sequentially arranged in the shell (9), and the filler box I type (21), the filler box II type (22), the filler box III type (24) and the filler box VI type are sequentially and alternately abutted.

4. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 3, wherein, A choke ring (10) is arranged in the filler box I type (21) and in sliding connection with the piston rod (5), a main sealing filler (23) is arranged in the filler box II type (22) and in sliding connection with the piston rod (5), a secondary sealing filler (1) is arranged in the filler box III type (24), a secondary sealing filler is arranged in the filler box VI type, and the secondary sealing filler (1) is in sliding connection with the piston rod (5).

5. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 4, wherein, A first nitrogen channel (4) is arranged in the pressing plate (7), the filler box III type (24) and the filler box VI type in cooperation, one end of the first nitrogen channel (4) is in communication with the through hole of the shell (9) at the side of the filler box III type (24) close to the filler box II type (22), the other end of the first nitrogen channel (4) is in communication with the outside of the shell (9), and a filler air outlet (2) in communication with the first nitrogen channel (4) is arranged on the pressing plate (7).

6. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 3, wherein, The pressing plate (7), the filler box III type (24) and the filler box VI type are internally matched with a second nitrogen passage (6), one end of the second nitrogen passage (6) is communicated with the through hole of the shell (9) at the side of the filler box VI type close to the filler box III type (24), the other end of the second nitrogen passage (6) is communicated with the outside of the shell (9), the pressing plate (7) is provided with a filler air filling port communicated with the second nitrogen passage (6), and the filler air filling port is provided with a self-operated pressure regulating valve.

7. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 3, wherein, The bottom plate (17) is abutted with the filler box I type (21), and an "O" I type sealing ring (19) is arranged between the bottom plate (17) and the filler box I type (21), and the shell (9) is peripherally connected with an "O" II type sealing ring (20).

8. The BOG helium withdrawal piston compressor nitrogen seal apparatus of claim 4, wherein, The main sealing filler (23) and the auxiliary sealing filler (1) are peripherally connected with springs.

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