Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
  • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
  • F04C29/06—Silencing
  • F04C29/061—Silencers using overlapping frequencies, e.g. Helmholtz resonators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2240/00—Components
  • F04C2240/30—Casings or housings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2201/00—Metals
  • F05C2201/02—Light metals
  • F05C2201/021—Aluminium
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2201/00—Metals
  • F05C2201/04—Heavy metals
  • F05C2201/0469—Other heavy metals
  • F05C2201/0496—Zinc
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
  • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

• the invention relates to a silencer for a vacuum pump
• the silencer is tuned to the attenuation of sound waves with a selected wavelength.
• Sound absorbers are known, for example, from document DE 40 11 658 A1, document DE 4333374 C1 and document WO 03/056223 A2.
• interference effects are used to attenuate sound in a fluid line.
• the silencer from the document DE 4333374 C1 has a first Reflexi onsdampf and a second reflection damper, the latter having two Stichlei lines that branch off from a main line and are connected to the main line with their first end.
• the second reflection silencer works according to the interference principle.
• the stub lines have a length of l / 2 and l / 4, where l is the length of the sound waves that are essentially to be attenuated. Stub lines are closed at a second end. Waves entering the stub lines are reflected at these second ends. The reflections run back into the main line and cause attenuation there.
• the silencer known from document DE 4333 374 C1 has a complex structure and is composed of several tubes with different cross-sections and other parts.
• a silencer known from the document WO 03/056223 A2 has a straight main channel around which helical bypass channels are wound, through which sound attenuation can be achieved using the interference effect.
• the structure of the sound absorber known from the document WO 03/056223 A2 is complex and the assembly time-consuming.
• the invention was based on the object of attenuating the sound waves propagating via a line through which the medium conveyed by the vacuum pump is pumped with a silencer which has a simple structure.
• the invention also uses the principle of destructive interference to dampen or cancel the sound waves.
• the structure of the silencer according to the invention is, however, significantly simpler than the structure of the silencer known from the prior art.
• the silencer according to the invention is multi-part and has at least a first part and a second part, which are connected to the miteinan to form an assembly, wherein in the first part and / or the second part at least one channel or another linear recess is provided, which or which forms one of the lines of the line arrangement or part of one of the lines of the line arrangement, the lines being provided in the assembly.
• the first and / or the second part are preferably monoliths.
• the first line between the first and the second end can run straight and the second line between the first and the second end can curve, run in curves or meander.
• the first part of a silencer according to the invention can be a ring or ring-like and / or the second part can be a ring or ring-like.
• the construction group from the first part and the second part can then enclose another assembly or something else.
• the silencer can have a first connection piece or nipple that is connected to the first connection of the silencer or forms the first connection or part of the first connection and / or a second connection piece or nipple that connects to the second connection of the silencer is connected or forms the second connection or part of the second connection.
• the first part and / or the second part can be cast parts.
• the channels or the other linear depressions that form the first or second line can be produced in a particularly simple manner in these cast parts.
• the cast parts can in particular be made of aluminum, aluminum alloys, zinc, zinc alloys or plastic.
• the first part and the second part of a silencer according to the invention can form a housing.
• the silencer according to the invention can be used in vacuum pumps. He inventive vacuum pumps are specified in claims 7 to 9.
• FIG. 1 shows a vacuum pump according to the invention, partly in an exploded view
• FIG. 2 shows a plan view of a first part of a muffler of the vacuum pump according to FIG. 1,
• FIG. 3 shows a perspective view of a first part of a silencer according to the invention
• FIG. 4 shows a perspective view of a second part of the silencer according to the invention
• FIG. 5 shows a perspective view of the silencer according to the invention with the first part from FIG. 3 and the second part from FIG. 4,
• FIGS. 5 and 6 shows a plan view of the muffler according to FIGS. 5 and
• FIG. 7 shows a section through the silencer along the line A-A in FIG. 6.
• the vacuum pump P shown in Figures 1 and 2 has a pump housing in which a pump chamber is provided.
• the pump chamber is not illustrated.
• One or more working media with which the vacuum is generated is provided in the pump chamber. This work equipment is driven by a motor.
• the pump P has a silencer S with which the sound that is transmitted via a medium line can be attenuated.
• the medium sucked out of the container to be evacuated is transported away via the medium line.
• the pump chamber has a second connection that serves as an outlet.
• a first connection which forms an inlet in the example, is connected to the container to be evacuated.
• a first connection 1 of the silencer which is provided in a first part 4 of the silencer S, is connected to the second connection of the pump chamber.
• a second connection 2 and a nipple 7 is also connected to this first part 4, to which the medium line can be connected.
• the first part 4 is essentially ring-shaped and arranged around the pump chamber. In the first part 4 channels are provided. These are parts of a line arrangement 3 and comprise a very short first line 31 which is connected to a first connection 1 of the muffler S, and a very short second line which is connected to the second connection 2 of the muffler.
• the second Lei device is also provided in the nipple 7.
• channels are provided which provide parts of a first central line 33 and a second central line 34, some of which are on circular paths around a Center of the first part 4 forming ring are arranged.
• a second part 5 of the silencer is also essentially ring-shaped. On a side facing the first part 4, it has a channel structure corresponding to the channel structure of the first part 4.
• the channel structures together form the line arrangement 3 of the muffler.
• Both middle lines 33, 34 have a first common end that connects to the first line 31, and a second common end that connects to the second line 32.
• the length of the first central line 33 has a length which corresponds to the wavelength l to be attenuated or deleted or a multiple of this wavelength l.
• the length of the second middle line 34 is half a wavelength l or an odd multiple longer than the first middle line 33.
• the muffler S is separate from the pump housing and the first part 4 and the second part 5 of this muffler form a separate Schalldamperge housing that is not annular.
• the first middle line is essentially straight and the second middle line 34 is designed in a meandering shape in the housing.
• 5 channels are provided in the first part 4 and the second part, which together form the lines 31, 32, 33, 34.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressor (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=74556891

Family Applications (1)

Country Status (3)

Family Cites Families (10)

• 2021
  • 2021-02-03 WO PCT/EP2021/052484 patent/WO2021197686A1/de unknown
  • 2021-02-03 EP EP21703646.6A patent/EP4127480A1/de active Pending
  • 2021-02-03 CN CN202180025217.6A patent/CN115335603A/zh active Pending

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