EP2905468B1 - Piston compressor for compressing gas - Google Patents

Piston compressor for compressing gas Download PDF

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Publication number
EP2905468B1
EP2905468B1 EP14198860.0A EP14198860A EP2905468B1 EP 2905468 B1 EP2905468 B1 EP 2905468B1 EP 14198860 A EP14198860 A EP 14198860A EP 2905468 B1 EP2905468 B1 EP 2905468B1
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EP
European Patent Office
Prior art keywords
piston rod
cooling liquid
buffer gas
cooling
piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP14198860.0A
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German (de)
English (en)
French (fr)
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EP2905468A1 (en
Inventor
Laurentius Gerardus Maria Koop
Petrus Nicolaas DUINEVELD
Teun Petrus Johannes ARENDS
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Howden Thomassen Compressors BV
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Howden Thomassen Compressors BV
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • the invention pertains to a piston compressor for compressing gas, in particular to a piston compressor in which the cylinder that comprises the compression chamber is arranged substantially horizontally.
  • the piston rod extends from the compression chamber through a piston rod passage the cylinder end.
  • a stuffing box with packing rings is provided to reduce the leakage of high pressure gas from the compression chamber via the piston rod passage in the cylinder end.
  • the packing rings have to provide this reduction of leakage under difficult circumstances: the pressure difference between then compression chamber and the environment outside the cylinder generally is high and the piston rod reciprocates through the packing rings, generally at a high speed.
  • the packing rings In order to obtain a good seal, the packing rings have to be in contact with the piston rod. In many cases, a force is applied to the packing rings, which force pushes the packing rings tightly against the piston rod. Such a force can for example be applied by circular springs or by means of a gas pressure. With such a design, higher pressure differences between the compression chamber and the environment outside the cylinder can be handled by the packing rings.
  • US 3,194,568 discloses the cooling of a piston rod inside the stuffing box.
  • the stuffing box comprises a channel that brings water to an annular space in the stuffing box that is present around the piston rod. Seals are provided on both axial ends of this annular space to keep most of the water in the annular space. Some water will adhere to the piston rod and slip through the seals. According to the disclosure of US 3,194,568 , this water will evaporate due to the elevated temperature of the piston rod and then disappear through venting holes that are provided in the stuffing box.
  • AT507564A4 discloses a sealing arrangement according to the principle of a sealing medium barrier providing sealing elements 8, 9 arranged in a radial direction at a distance relative to the radial end of the recess 10 that receives the sealing elements 8, 9.
  • the invention aims to provide a piston compressor with a piston rod external surface cooling system.
  • a horizontal piston compressor for compressing gas comprising:
  • a piston rod external surface cooling system for cooling a piston rod external surface of a piston compressor with a cooling liquid, the system comprising:
  • Fig. 1 shows a side view of a horizontal piston compressor.
  • the compressor comprises a frame 1, in or to which other parts of the compressor are mounted.
  • the piston comprises a cylinder 2.
  • the cylinder 2 has a first cylinder end 3 and a second cylinder end 4.
  • the first cylinder end 3 and the second cylinder end 4 are each arranged at an axial end of the cylinder 2.
  • the first cylinder end 3 comprises a piston rod passage 7.
  • the cylinder 2 further has a cylinder wall 5 and a longitudinal axis 6.
  • a piston 10 is arranged in the cylinder 2, which means that it can move back and forth inside the cylinder 2 along the longitudinal axis 6 of the cylinder 2.
  • the piston is lubricated by a liquid lubricant (e.g. oil) such that metal-to-metal contact between the piston and the cylinder wall is prevented.
  • a liquid lubricant e.g. oil
  • no oil lubrication is necessary between the piston and the cylinder wall.
  • Such piston compressors in which there is no oil lubrication between the piston and the cylinder wall are referred to as non-lubricated compressors.
  • Such compressors could comprise parts, for example rider rings that extend around the piston, that contain a solid lubricant such as molybdenum disulfide.
  • a special kind of non-lubricated compressors are the so called "floating piston compressors". In such compressors, a gas film between the piston and the cylinder wall is present to prevent metal-to-metal contact between the piston and the cylinder wall. Examples of a floating piston compressor are described in EP0839280 .
  • At least one compression chamber is present in the cylinder 2.
  • Each compression chamber is delimited on one axial end by the piston and on the opposite axial end by a cylinder end.
  • the piston compressor comprises two compression chambers 11, 21.
  • Each compression chamber has an inlet port 12, 22 and an outlet port 13, 23.
  • inlet port 12, 22, an inlet valve 14, 24 is arranged in each compression chamber inlet port 12, 22, an inlet valve 14, 24 is arranged in each compression chamber outlet port 13, 23, an outlet valve 15, 25 is arranged in each compression chamber outlet port 13, 23, an outlet valve 15, 25 is arranged.
  • the valves 14,24,15,25 are controlled in such a way that when the inlet valve 14, 24 of a compression chamber 11, 21 is open, the outlet valve 15, 25 of that same compression chamber is closed, and that when the outlet valve 15, 25 of a compression chamber 11, 21 is open, the inlet valve 14, 24 of that same compression chamber is closed.
  • the piston 10 is mounted on piston rod 30.
  • the piston rod has a first end 31 and a second end 32.
  • the piston 10 is connected to the first end 31 of the piston rod 30.
  • the piston rod can extend beyond the piston 10 into pressure chamber 11 and through a passage in the second cylinder end 4.
  • the piston rod 30 extends through a distance piece 35 in the frame 1 to the drive assembly 40.
  • the second end 32 of the piston rod 30 is connected to crosshead 41.
  • the crosshead reciprocates inside the distance piece 35 of frame 1.
  • the crosshead 41 is driven by connecting rod 42.
  • the connecting rod 42 has a first end 43 and a second end 44.
  • the first end 43 of the connecting rod 42 is connected to the crosshead 41, while the second end 44 of the connecting rod 42 is connected to crank shaft 45.
  • crank shaft 45 rotates.
  • the connection rod 42 transforms this rotation into a translation, and therewith drives the reciprocating movement of the crosshead 41.
  • packing rings 51 are present for the actual sealing.
  • the packing rings 51 reduce or even prevent leakage of gas from the compression chamber 21 over the surface of the piston rod.
  • the packing rings 51 have to fit tightly around the piston rod 30. This causes friction between the packing rings 51 and the piston rod 30, and therewith heating of the piston rod.
  • the piston rod 30 extends through just one of the cylinder ends.
  • the horizontal piston compressor of fig. 1 is provided with a piston rod external surface cooling system for cooling the surface of the piston rod.
  • This piston rod external surface cooling system comprises a piston rod cooling unit 60.
  • the cooling unit 60 is arranged outside the stuffing box 50 that contains the packing rings, and not connected to the stuffing box 50.
  • the cooling unit can be connected to the outside of the stuffing box or arranged inside the stuffing box.
  • the piston rod cooling unit 60 is preferably arranged adjacent the packing ring or packing rings, because that is where the piston rod is heated up, due to the friction between the packing rings and the piston rod.
  • the piston rod external surface cooling system further comprises a cooling liquid source 61.
  • the cooling liquid source 61 is connected to the piston rod cooling unit 60 by at least one cooling liquid flow line 62.
  • This first cooling liquid flow line 62 takes cooling liquid from the cooling liquid source 61 to the piston rod cooling unit 60.
  • a second cooling liquid flow line 63 is present, which takes cooling liquid from the piston rod cooling unit 60 back to the cooling liquid source 61.
  • Fig. 2 shows an embodiment of a piston rod cooling unit 60 according to the invention.
  • Piston rod 30 extends through the piston rod cooling unit 60, so that the cooling unit can act directly on the surface of the piston rod 30.
  • the piston rod 30 reciprocates through the piston rod cooling unit 60 in accordance with arrow 33.
  • the piston rod cooling unit 60 comprises a housing 70, which in the embodiment of fig. 2 is made up of a first housing ring 71 and a second housing ring 72. Using two or more housing rings that together form the housing 70 allows an easy mounting of the cooling unit onto the piston rod. Inside the housing 70, a ring member 75 is present. For easy mounting, the ring member 75 and the housing rings 71, 72 are made up out of two or more ring segments. The housing rings 71, 72 are mounted in such a way that they cannot move relative to each other.
  • the outer diameter of the ring member is smaller than the inner diameter of the housing rings 71, 72 where the housing rings 71, 72 extend over the ring member 75.
  • This annulus 73 makes relative movement in radial directions of the ring member 75 with respect to the tubular housing 70 possible.
  • the ring member 75 comprises a bore 76.
  • the piston rod cooling unit 60 is mounted to the piston rod of a piston compressor, the piston rod 30 extends through this bore 76.
  • the diameter of the bore 76 is larger than the outside diameter of the piston rod 30, or at least larger than the outside diameter of the part of the piston rod 30 that reciprocates through the piston rod cooling unit 60.
  • the difference between the diameter of the bore and the diameter of the piston rod makes that an annular space 77 is present between the ring member 75 and the piston rod 30. If the piston rod 30 is perfectly centered in the bore 77, the distance 78 between the piston rod 30 and the surface of the bore 76 is the same over the entire circumference of the bore.
  • the diameter of the bore 76 can vary over the length of the bore, e.g. in the form of a stepwise variation, but the diameter can also be constant over the length of the bore.
  • the difference between the diameter of the bore 76 and the diameter of the piston rod 30 is between 0,1 mm and 0,6 mm at the portion of the bore 76 that has the smallest diameter. In an alternative embodiment, the difference between the diameter of the bore 76 and the diameter of the piston rod 30 is between 0,2 mm and 0,4 mm at the portion of the bore 76 that has the smallest diameter. In a further alternative embodiment, the difference between the diameter of the bore 76 and the diameter of the piston rod 30 is about 0,3 mm at the portion of the bore 76 that has the smallest diameter.
  • the piston rod cooling unit 60 further comprises a cooling liquid supply channel 80.
  • This cooling liquid supply channel has an inlet 81, which receives cooling liquid from the cooling liquid source via cooling liquid flow line 62.
  • Channel 82 allows the cooling liquid to flow through the housing ring 71. From channel 82, the cooling liquid comes into cooling liquid supply space 83, between the housing ring 71 and the ring member 75.
  • the cooling liquid supply space 83 forms part of the annulus 73 between the ring member 75 and the housing rings 71, 72.
  • the annulus can be empty, or filled with cooling liquid, or partly filled with cooling liquid, entirely or partly filled with a buffer gas or any other type of gas, or it can accommodate elastic members and/or seals.
  • the cooling liquid supply space 83 is sealed on its two axial ends by seals 84.
  • the seals 84 make that the cooling liquid flows from the cooling liquid supply space 83 to channel 85 in the ring member 75, and does not escape before having reached the annular space 77 between the ring member 75 and the piston rod 30.
  • Channel 85 in the ring member 75 allows the cooling liquid to flow from the cooling liquid supply space 83 to supply port 86, which is in fluid communication with the bore 76 of the ring member 75. From the supply port 86, the cooling liquid enters the annular space 77 between the ring member 75 and the piston rod 30.
  • the supply port 86 preferably has a smaller diameter than the channel 85 such that it forms an orifice. This creates a better flow profile in flow of the cooling liquid.
  • the cooling liquid is in direct contact with the piston rod's outer surface, so that it can cool the surface of the piston rod 30.
  • the ring member 75 is provided with more than one channel 85 with a supply port 86. This provides a better distribution of cooling liquid from the cavity 83 to the annular space 77 between the ring member and the piston rod. Alternatively, there is a single channel 85 with supply port 86.
  • the cooling liquid flows through the annular space 77 to cooling liquid collection chambers 87.
  • the flow of cooling liquid through the annular space 77 cools the external surface of the piston rod 30.
  • cooling liquid collection chambers 87 are provided in the embodiment of fig. 2 . It is however also possible that just a single collection chamber 87 is present.
  • the piston rod cooling unit 60 further comprises two cooling liquid seals 90. They can be any type of suitable seals; in fig. 2 scraper rings are applied. They have the additional benefit of -apart from sealing- scraping cooling liquid from the surface of the reciprocating piston rod.
  • the cooling liquid seals 90 delimit the annular space between the ring member 75 and the piston rod 30 in axial direction.
  • the cooling liquid collection chambers 87 are widened portions of this annular space, formed by parts of the bore that have a larger diameter than the central portion of the bore.
  • the central portion of the bore has the smallest diameter, and therewith forms the part of the annular space 77 that has the smallest distance 78 between the ring member 75 and piston rod 30.
  • the cooling liquid is discharged.
  • the cooling liquid is discharged.
  • multiple discharge channels 91 are provided.
  • a single discharge channel can be present.
  • the cooling liquid enters the discharge channel via discharge port 92.
  • This discharge port 92 is in fluid communication with the bore 76 and therewith with the annular space 77 between the ring member 75 and the piston rod 30.
  • the cooling liquid comes into channel 93 in the ring member 75, and from there in the cooling liquid discharge space 94, which is part of the annulus 73 between the ring member 75 and the housing 70.
  • Seals 99 seal outer axial ends of the cooling liquid discharge spaces 94.
  • the inner axial ends of the cooling liquid discharge spaces 94 are sealed by seals 84.
  • Seals 84 prevent the flow of cooling liquid from cooling liquid supply space 83 to a cooling liquid discharge space 94.
  • Seals 99 prevent the escape of cooling liquid from cooling liquid discharge spaces 94 to at their respective outer axial end.
  • the seals 99 and 84 are arranged in grooves 88 of the housing rings 71, 72.
  • the grooves 88 are dimensioned in such a way that the seals 99,84 can move relative to the housing ring 71,72, thereby allowing relative movement of the ring member relative to the housing 70.
  • the cooling liquid in the cooling liquid supply space 83 and cooling liquid discharge spaces 94 acts as a combination of a spring and a dampener for the relative movement of the ring member 75 and the housing 70.
  • the cooling liquid seals are arranged in grooves 97 in the ring member 75.
  • the grooves 97 have a larger radial dimension than the outer diameter of the cooling liquid seal 90, so that in radial direction there is space between the outer diameter of the cooling liquid seal and the wall of the respective groove 97.
  • the grooves 97 are in fluid communication with the cooling liquid discharge channel via duct 98. If any cooling liquid slips past the seal 90 into groove 97, it flows out of groove 97 again via duct 98. Ducts 98 therewith prevent the build-up of cooling liquid in grooves 97.
  • the cooling unit 60 is further provided with a buffer gas system.
  • the buffer gas system comprises a buffer gas source 100 for the supply of pressurized buffer gas. Via buffer gas supply lines 101, the buffer gas source 100 supplies a buffer gas under pressure to buffer gas supply channels 102. Each housing ring 71, 72 has been provided with a buffer gas supply channel 102.
  • the buffer gas can be an inert gas, such as nitrogen.
  • the buffer gas can be the same type of gas as the gas that is compressed by the piston compressor.
  • the buffer gas source can receive the gas that will function as buffer gas from the same source as from which the compressor receives the gas to be compressed.
  • the buffer gas source could also be a separate container which contains gas under pressure.
  • the housing rings 71, 72 have a part with a large internal diameter. This part extends over the ring member 75.
  • the housing rings 71, 72 also have a part with a smaller internal diameter. This part is located next to an axial end of the ring member 75.
  • buffer gas can then enter this space from the buffer gas supply channel 102. From this space 103, the buffer gas can reach annular buffer gas space 104. Alternatively, buffer gas channel 102 can be extended such that it supplies the buffer gas directly to the associated buffer gas space 104.
  • the buffer gas spaces 104 are delimited on one axial end by a buffer gas seal 105 and on the opposite axial end by a cooling liquid seal 90.
  • the gas in the buffer gas spaces is kept under pressure by the buffer gas source 100.
  • the pressure of the buffer gas in the buffer gas spaces 104 acts to counter the entraining of cooling liquid on the external surface of the piston rod to the outside of the cooling unit.
  • the buffer gas can also enter space 106 between the outer diameter of the ring member 75 and the inner diameter of the housing ring 71, 72. This way, the buffer gas pressure also acts on the seals 99, helping to reduce or even prevent the leakage of cooling liquid over these seals.
  • Fig. 3 shows a second embodiment of a cooling unit in accordance with the invention.
  • a ring member 205 is present.
  • the ring member has a bore 206, which bore has a diameter that is larger than the diameter of the piston rod 30, or at least larger than the outside diameter of the part of the piston rod 30 that reciprocates through the piston rod cooling unit 200.
  • the piston rod 30 extends through the bore 206 of the ring member 205.
  • an annular space 207 is present between the surface of the bore 206 of the ring member 205 and the outer surface of the piston rod 30.
  • the ring member 205 is arranged in a housing, which housing comprises housing ring 210.
  • the outer diameter of the ring member 205 is smaller than the inner diameter of the housing ring 210 where the housing ring 210 extends over the ring member 205.
  • This annulus 215 makes relative movement in radial directions of the ring member 205 with respect to the housing ring 210 possible.
  • the difference between the diameter of the bore 206 and the diameter of the piston rod 30 is between 0,1 mm and 0,6 mm. In an alternative embodiment, the difference between the diameter of the bore 206 and the diameter of the piston rod 30 is between 0,2 mm and 0,4 mm a. In a further alternative embodiment, the difference between the diameter of the bore 206 and the diameter of the piston rod 30 is about 0,3 mm.
  • the piston rod cooling unit 200 further comprises a cooling liquid supply channel 220.
  • This cooling liquid supply channel has an inlet 221, which receives cooling liquid from the cooling liquid source via a cooling liquid flow line 62.
  • Channel 222 allows the cooling liquid to flow through the housing ring 210. From channel 222 the cooling liquid comes into cooling liquid supply space 223, between the housing ring 210 and the ring member 205.
  • the cooling liquid supply space 223 forms part of the annulus 215 between the ring member 205 and the housing ring 210.
  • the annulus can be empty, or filled with cooling liquid, or partly filled with cooling liquid, entirely or partly filled with a buffer gas or any other type of gas, or it can accommodate elastic members and/or seals.
  • the cooling liquid supply space 223 is sealed on its two axial ends by seals 224.
  • the seals 224 make that the cooling liquid flows from the cooling liquid supply space 223 to channel 225 in the ring member 205, and does not escape before having reached the annular space 207 between the ring member 205 and the piston rod 30.
  • Channel 225 in the ring member 205 allows the cooling liquid to flow from the cooling liquid supply space 223 to supply port 226, which is in fluid communication with the bore 206 of the ring member 205. From the supply port 226, the cooling liquid enters the annular space 207 between the ring member 205 and the piston rod 30.
  • the supply port 226 preferably has a smaller diameter than the channel 225 such that it forms an orifice. This creates a better flow profile in flow of the cooling liquid.
  • the cooling liquid is in direct contact with the piston rod's outer surface, so that it can cool the surface of the piston rod 30.
  • the ring member 205 is provided with more than one channel 225 with a supply port 226. This provides a better distribution of cooling liquid from the cavity 223 to the annular space 207 between the ring member and the piston rod. Alternatively, there is a single channel 225 with supply port 226.
  • the cooling liquid flows through the annular space 207 to primary cooling liquid collection chambers 227.
  • the flow of cooling liquid through the annular space 207 cools the external surface of the piston rod 30.
  • the primary cooling liquid collection chambers 227 are arranged on both axial ends of the annular space 207 between the piston rod 30 and the ring member 205. They receive cooling liquid from the annular space 207. Instead of two primary cooling liquid collection chambers 227, it is possible to have a single primary cooling liquid collection chamber 227. In that case, it is advantageous to arrange the supply port 226 on one axial end of the annular space 207 and the primary cooling liquid collection chamber 227 on the other axial end of the annular space 207.
  • Each primary cooling liquid collection chamber 227 is formed in a discharge ring 240.
  • Each discharge ring 240 is arranged on an axial end of housing ring 210.
  • Each discharge ring 240 is provided with a bore 241.
  • the diameter of the bore 241 of each discharge ring is preferably larger than the diameter of the bore 206 of the ring member 205.
  • each discharge ring 240 has a discharge port 243 and an outlet 244.
  • the cooling liquid that flows out of the liquid discharge channels 242 is collected in one or more secondary cooling liquid collection chambers 245.
  • two secondary cooling liquid collection chambers 245 are present, each associated with a discharge ring 240.
  • the secondary cooling liquid collection chambers 245 extend over the circumference of the discharge rings 240, and are formed by a ring 246 having a recess 247 therein.
  • the recess 247 preferably extends around the entire inner circumference of the ring 246.
  • cooling liquid that is collected in a secondary cooling liquid collection chamber 245 flows from that secondary cooling liquid collection chamber 245 back to the cooling liquid source via cooling liquid flow line 63.
  • each primary cooling liquid collection chamber 227 is delimited by a cooling liquid seal 230.
  • the cooling liquid seals 230 can be any type of suitable seals; in fig. 3 scraper rings are applied. They have the additional benefit of -apart from sealing- scraping cooling liquid from the surface of the reciprocating piston rod.
  • Each cooling liquid seal 230 is arranged in a groove 231 in the discharge ring 240. Both grooves 231 have a larger radial dimension than the outer diameter of the cooling liquid seal 230, so that in radial direction there is space between the outer diameter of the cooling liquid seal 230 and the wall of the respective groove 231 in which it is arranged.
  • the grooves 231 are in fluid communication with the secondary cooling liquid collection chamber 245 via duct 233. If any cooling liquid slips past the seal 230 into groove 231, it flows out of groove 231 again via duct 233. Ducts 233 therewith prevent the build-up of cooling liquid in grooves 231.
  • each back up ring 270 is arranged adjacent a discharge ring 240, on the side opposite to the side facing the ring member 205.
  • the back up ring 270 has a bore 272 which is preferably smaller than the outer diameter of the cooling liquid seal 230, so that it can proved axial support for the cooling liquid sealing ring 230.
  • the piston rod 30 extends through this bore 272.
  • the back up rings are provided with one or more channels 271, which are in fluid communication with a secondary cooling liquid collection chamber 245. This way, any cooling liquid that slips through past the cooling liquid seals 230 via the surface of the piston rod 30 can flow to the secondary cooling liquid collection chamber 245, and from there back to the cooling liquid source via a cooling liquid flow line 63.
  • the cooling unit 200 is further provided with a buffer gas system.
  • the buffer gas system comprises a buffer gas source 250 for the supply of pressurized buffer gas. Via buffer gas supply lines 251, the buffer gas source 250 supplies a buffer gas under pressure to buffer gas supply channels 252. In the embodiment of fig. 3 , separate buffer gas rings 255 have been provided. Each buffer gas ring 255 is provided with one or more buffer gas channels 252.
  • the buffer gas can be an inert gas, such as nitrogen.
  • the buffer gas can be the same type of gas as the gas that is compressed by the piston compressor.
  • the buffer gas source can receive the gas that will function as buffer gas from the same source as from which the compressor receives the gas to be compressed.
  • the buffer gas source could also be a separate container which contains gas under pressure.
  • Each buffer gas ring 255 has been provided with bore 256, such that a buffer gas space 260 is created.
  • the buffer gas spaces 260 are delimited on both axial ends by a buffer gas seal 261 a,b.
  • the buffer gas seals 261a on the inner axial end of a buffer gas space 260 press against a surface of a back up ring 270, while the buffer gas seals 261 b on the outer axial end of a buffer gas space 260 press against the surface of an end ring 275.
  • the gas in the buffer gas spaces is kept under pressure by the buffer gas source 250.
  • the pressure of the buffer gas in the buffer gas spaces 260 acts to counter the entraining of cooling liquid on the external surface of the piston rod to the outside of the cooling unit.
  • the discharge rings 240, the back up rings 270, the buffer gas rings 255 and the end rings 275 all are separate rings. It is however also possible to combine two or three adjacent rings into a single ring. For example, a discharge ring and a back up ring, or a backup ring, a buffer gas ring and an end ring can be combined into a single ring.
  • the rings of a cooling unit such as shown in fig.2 or fig. 3 are held together in axial direction by clamping them between two flanges, by arranging them in a cooling unit housing or in the housing of the stuffing box, or by clamping them between a flange and the housing of the stuffing box.
  • Fig. 4 shows an embodiment of a piston rod external surface cooling system according to the invention.
  • the system of fig. 4 comprises a cooling unit 60, which is mounted in the piston compressor in such a way that the piston rod 30 extends through the cooling unit 60.
  • the cooling unit can be the embodiment as shown in fig. 2 or any other embodiment according to the invention. In the example of fig. 4 , the cooling unit is mounted to the outside of the stuffing box.
  • the piston rod external surface cooling system of fig. 4 further comprises a cooling liquid source 61 in the form of a reservoir containing cooling liquid.
  • First cooling liquid flow line 67 connects the cooling liquid source to a pump 65.
  • Pump 65 provides the flow of cooling liquid through the cooling system.
  • Second cooling liquid flow line 62 takes the cooling liquid to the cooling unit.
  • Third cooling liquid flow line 63 receives the cooling liquid from the cooling unit 60 again. The cooling liquid has now been heated up by the piston rod.
  • Third cooling liquid flow line 63 brings the heated up cooling liquid to heat exchanger 66, where the cooling liquid is cooled again.
  • the heat exchanger can be any suitable kind of heat exchanger, e.g. a countercurrent flow heat exchanger, a heat exchanger with atmospheric air as a cooling medium.
  • Fourth cooling liquid flow line 68 takes the cooled cooling liquid back to the cooling liquid source 61, the reservoir, again.
  • the cooling liquid source 61, the pump 65 and the heat exchanger 66 are mounted in a housing 64 together.
  • Fig. 5 shows different ways of mounting the cooling unit 60 onto the piston rod 30.
  • the housing of the cooling unit 60 is provided with a flange 69.
  • the cooling unit is attached to the stuffing box 50 using bolts.
  • the cooling unit is not attached to the stuffing box 50, but to the frame 1.
  • the connection with the frame 1 makes that the cooling unit 60 remains in place despite the reciprocating action of the piston rod 30.
  • hinges 79 are provided in the connection between the cooling unit 60 and the frame 1. This way, the cooling unit can cope with tilting of the piston rod relative to the frame, as e.g. occurs due to bending of the piston rod.
  • Fig. 5C shows a stuffing box 50 which is enlarged, so the cooling unit 60 can be placed within the stuffing box 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP14198860.0A 2011-05-04 2012-05-02 Piston compressor for compressing gas Active EP2905468B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2006718A NL2006718C2 (en) 2011-05-04 2011-05-04 Piston compressor for compressing gas.
EP12724749.2A EP2712408B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP12724749.2A Division-Into EP2712408B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas
EP12724749.2A Division EP2712408B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas

Publications (2)

Publication Number Publication Date
EP2905468A1 EP2905468A1 (en) 2015-08-12
EP2905468B1 true EP2905468B1 (en) 2016-11-30

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Application Number Title Priority Date Filing Date
EP14198860.0A Active EP2905468B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas
EP12724749.2A Active EP2712408B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas

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EP12724749.2A Active EP2712408B1 (en) 2011-05-04 2012-05-02 Piston compressor for compressing gas

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EP (2) EP2905468B1 (es)
ES (2) ES2608928T3 (es)
NL (2) NL2006718C2 (es)
WO (1) WO2012150862A2 (es)

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DE102020101312B3 (de) * 2020-01-21 2021-03-25 Nidec Gpm Gmbh Trockenlauffähige Orbiter-Vakuumpumpe
RU2784159C1 (ru) * 2022-03-16 2022-11-23 Общество с ограниченной ответственностью "НОВАЯ СЕРВИСНАЯ КОМПАНИЯ" Воздушная компрессорная станция на оппозитной базе

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KR101902092B1 (ko) * 2014-04-04 2018-11-02 호우덴 토마쎈 컴프레셔스 비브이 변형된 단부를 갖는 연결 로드
CN106762545A (zh) * 2016-12-20 2017-05-31 金凯威（廊坊）压缩机有限公司 新型活塞式工艺压缩机
CN107687420B (zh) * 2017-03-21 2019-04-19 深圳市宝安东江环保技术有限公司 混合密封介质的碳环密封系统和方法
FR3072136B1 (fr) * 2017-10-10 2021-11-19 Atlas Copco Crepelle S A S Systeme d'etancheisation d'une tige de piston pour une machine a mouvement alternatif et procede pour l'etancheisation d'une telle tige de piston
CN107882815A (zh) * 2017-12-25 2018-04-06 宣城铁凝机械有限公司 一种节能气缸活塞杆
CN108953114B (zh) * 2018-09-14 2020-05-08 蚌埠艾普压缩机制造有限公司 一种加氢站氢气压缩机冷却结构
US20230358226A1 (en) * 2022-05-09 2023-11-09 Hoerbiger Wien Gmbh Pressure packing for a reciprocating piston compressor with buffer gas barrier
CN116538052B (zh) * 2023-05-30 2024-04-19 烟台东德氢能技术有限公司 一种带进排气阀的双作用循环液封压缩气缸总成
CN116753137B (zh) * 2023-05-30 2024-04-23 烟台东德氢能技术有限公司 一种循环液封压缩气缸总成

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Publication number Priority date Publication date Assignee Title
DE102020101312B3 (de) * 2020-01-21 2021-03-25 Nidec Gpm Gmbh Trockenlauffähige Orbiter-Vakuumpumpe
RU2784159C1 (ru) * 2022-03-16 2022-11-23 Общество с ограниченной ответственностью "НОВАЯ СЕРВИСНАЯ КОМПАНИЯ" Воздушная компрессорная станция на оппозитной базе

Also Published As

Publication number Publication date
WO2012150862A3 (en) 2013-04-18
ES2608928T3 (es) 2017-04-17
EP2712408B1 (en) 2016-08-17
NL2009747C2 (en) 2013-06-18
NL2009747A (en) 2013-01-08
EP2712408A2 (en) 2014-04-02
EP2905468A1 (en) 2015-08-12
WO2012150862A2 (en) 2012-11-08
NL2006718C2 (en) 2012-11-06
ES2590142T3 (es) 2016-11-18

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