CN115335603A - Muffler for a vacuum pump and vacuum pump having such a muffler - Google Patents

Muffler for a vacuum pump and vacuum pump having such a muffler Download PDF

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Publication number
CN115335603A
CN115335603A CN202180025217.6A CN202180025217A CN115335603A CN 115335603 A CN115335603 A CN 115335603A CN 202180025217 A CN202180025217 A CN 202180025217A CN 115335603 A CN115335603 A CN 115335603A
Authority
CN
China
Prior art keywords
muffler
connection end
vacuum pump
pipe
gas flow
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.)
Pending
Application number
CN202180025217.6A
Other languages
Chinese (zh)
Inventor
C·本施
S·盖达
T·海瑟
U·杰格尔
R·沃尔克
J·张
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hella GmbH and Co KGaA
Original Assignee
Hella GmbH and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of CN115335603A publication Critical patent/CN115335603A/en
Pending legal-status Critical Current

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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

Landscapes

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

Abstract

The invention relates to a muffler (S) for a vacuum pump (P), the muffler-having a first connection end (1) for the gas flow-having a second connection end (2) for the gas flow, and-having a pipe arrangement (3) between the first connection end (1) and the second connection end (2), wherein the muffler (S) is tuned to attenuate sound waves having a selected wavelength (lambda), the pipe arrangement (3) has a first pipe (31), said first conduit being connected to said first connection end (1), -a second conduit (32), said second conduit being connected to said second connection end (2), and-two intermediate conduits (33, 34), wherein the intermediate pipe (33, 34) is connected with a first end to the pipe (31) on the side of the first connection end (1) and with a second end to the pipe (32) on the side of the second connection end (2), and a first intermediate duct (33) of the two intermediate ducts (33, 34) has a first length (l 1) and a second intermediate duct (34) of the two intermediate ducts (33, 34) has a second length (l 2), the second length is longer or shorter than the first length (l 1) by half (lambda/2) of the selected wavelength (lambda).

Description

Muffler for a vacuum pump and vacuum pump having such a muffler
Technical Field
The present invention relates to a muffler for a vacuum pump,
having an inlet for the gas flow,
having an outlet for the gas flow, an
With a pipe arrangement between the inlet and the outlet,
wherein the muffler is tuned to attenuate sound waves having a selected wavelength.
Background
Mufflers are known, for example, from the documents DE 40 11 658 A1, DE 43 33 C1 and WO 03/056223 A2. In the sound absorbers known from said document, interference effects are used in order to attenuate sound in the fluid line.
The muffler in DE 43 33 374 C1 has a first reflection muffler and a second reflection muffler, the latter having two branch lines which branch off from the main line and are connected to the main line for this purpose with their first ends. The second reflection muffler works according to the interference principle. The branch conduits have lengths of lambda/2 and lambda/4, where lambda is the length of the sound wave to be substantially attenuated. The branch conduit is blocked at the second end. The wave entering the branch conduit is reflected on said second end. The reflections return into the main conduit and cause attenuation there. The muffler known from DE 43 33 374 C1 has a complex construction and consists of a plurality of tubes and other parts with different cross sections. At least the assembly of the muffler is costly.
The sound absorber known from WO 03/056223 A2 has a linear main channel around which a spiral-shaped bypass channel is wound, by means of which sound attenuation can be achieved by means of interference effects. The construction of the sound damper known from document WO 03/056223 A2 is also complicated and assembly is complicated.
Disclosure of Invention
The invention is started here.
The object of the invention is to damp sound waves propagating through a pipe, through which a medium conveyed by a vacuum pump is pumped, with a muffler having a simple construction.
According to the invention, this object is achieved by a muffler having the features of claim 1. Further developments of the invention are given in the dependent claims. The present invention also utilizes the principle of destructive interference of sound waves to attenuate or eliminate sound waves. The construction of the sound absorber according to the invention is, however, significantly simpler than that of the sound absorbers known from the prior art. The muffler according to the invention is in this case multi-part and has at least one first part and one second part which are connected to one another to form an assembly, wherein at least one channel or a further linear (linenhaft) recess is provided in the first part and/or the second part, which channel or recess forms one of the conduits of the conduit arrangement or a part of one of the conduits of the conduit arrangement, wherein the conduits are provided in the assembly.
Preferably, the first portion and/or the second portion is a monolithic piece of material.
In one variant of the muffler according to the invention, the first line may extend linearly between the first end and the second end, while the second line extends in an oscillating, curved or meandering manner between the first end and the second end.
In a further variant, it is possible for the first duct to extend along a circular arc and/or for the second duct to extend along a circular arc.
The first part of the muffler according to the invention may be annular or ring-shaped and/or the second part may be annular or ring-shaped. The component comprising the first and second parts may then enclose another component or the like.
The muffler can have a first connecting piece or a screw connection which is connected to or forms part of the first connecting end of the muffler and/or can have a second connecting piece or a screw connection which is connected to or forms part of the second connecting end of the muffler.
The first portion and/or the second portion may be a casting. In the casting, a channel or other linear recess, which forms the first or second duct, can be produced particularly simply. The cast part can be produced in particular from aluminum, aluminum alloys, zinc alloys or plastics.
The first part and the second part of the muffler according to the invention may form a housing.
The muffler according to the invention can be used in a vacuum pump. The vacuum pump according to the invention is given in claims 7 to 9.
Drawings
The invention is explained in more detail below with the aid of the figures. In the figure:
figure 1 shows a vacuum pump according to the invention partly in an exploded view,
figure 2 shows a plan view of a first part of a muffler of the vacuum pump according to figure 1,
figure 3 shows a perspective view of a first part of a muffler according to the invention,
figure 4 shows a perspective view of a second part of a muffler according to the invention,
figure 5 shows a perspective view of a muffler according to the present invention having a first part in figure 3 and a second part in figure 4,
fig. 6 shows a plan view of the muffler according to fig. 5, an
Fig. 7 showsbase:Sub>A sectional view of the muffler according to linebase:Sub>A-base:Sub>A in fig. 6.
Detailed Description
The vacuum pump P shown in fig. 1 and 2 has a pump housing in which a pump chamber is provided. The pump chamber is not shown. One or more working devices are arranged in the pump chamber, with which a vacuum is generated. The working device is driven by a motor.
The pump P has a sound absorber S with which sound transmitted via the medium line can be attenuated. The medium sucked from the container to be evacuated is conveyed via the medium conduit. The pump chamber has a second connecting end that serves as an outlet. For example, the first connection end forming the inlet is connected to the container to be evacuated.
The first connection end 1 of the muffler, which is provided in the first section 4 of the muffler S, is connected to the second connection end of the pump chamber. A second connection end 2 and a screw connection 7, to which a medium line can be connected, are also connected to the first part 4. The first section 4 is substantially annular and is arranged around the pump chamber.
In the first portion 4 a channel is provided. These channels are part of the pipe arrangement 3 and comprise a very short first pipe 31, which is connected to the first connection end 1 of the muffler S, and a very short second pipe, which is connected to the second connection end 2 of the muffler. A second conduit is also provided in the nipple 7. Between the passages provided in the first portion 4, forming part of the first and second ducts 31, 32, there are passages that define part of the first and second intermediate ducts 33, 34, which are partially arranged on an annular track around the mid-point of the ring forming said first portion 4.
The second part 5 of the muffler is likewise substantially annular. Which on the side facing the first part 4 has a channel structure corresponding to the channel structure of the first part 4. These channel structures together form the pipe arrangement 3 of the muffler.
The two intermediate ducts 33, 34 have a common first end connected to the first duct 31 and a common second end connected to the second duct 32.
The length of the first intermediate pipe 33 has a length which is equal to the wavelength λ to be attenuated or damped or a multiple of this wavelength λ.
The length of the second intermediate conduit 34 is one half wavelength lambda or an odd multiple longer than the first intermediate conduit 33. Thereby, the peaks and troughs of the sound waves guided via the intermediate ducts meet and destructively interfere on the second end and thereby a damping or at least attenuation of the sound waves occurs on the second end of the intermediate ducts.
The sound absorber S shown in fig. 3 to 7 operates on the same principle as the sound absorber S of the vacuum pump P according to fig. 1 and 2. The main difference is that the muffler according to fig. 3 to 7 is not mounted in or on the pump housing or is not part of the pump housing. The muffler S is separate from the pump housing and the first 4 and second 5 parts of the muffler form one own muffler housing, which is not annular. The first intermediate line is embodied essentially linearly, while the second intermediate line 34 is embodied meanderly in the housing. For this purpose, channels are provided in the first part 4 and the second part 5, which channels together form the ducts 31, 32, 33, 34.
List of reference numerals
S silencer
1. First connecting end
2. Second connecting end
3. Pipeline arrangement structure
31. First pipeline
32. Second pipeline
33. First intermediate pipe
34. Second intermediate pipe
4. First part of muffler
5. Second part of the muffler
6. Threaded joint
7. Threaded joint
P vacuum pump

Claims (9)

1. A muffler (S) for a vacuum pump (P),
having a first connection end (1) for a gas flow,
has a second connection end (2) for the gas flow, and
having a pipe arrangement (3) between a first connection end (1) and a second connection end (2),
wherein the muffler (S) is tuned to attenuate sound waves having a selected wavelength (lambda),
the pipe arrangement (3) has
A first conduit (31) connected to the first connection end (1),
a second pipe (32) connected to the second connection end (2), and
two intermediate ducts (33, 34),
wherein the intermediate pipe (33, 34) is connected with a first end to the first pipe (31) on the side of the first connection end (1) and with a second end to the second pipe (32) on the side of the second connection end (2), and
a first (33) of the two intermediate ducts (33, 34) having a first length (l 1) and a second (34) of the two intermediate ducts (33, 34) having a second length (l 2) which is longer or shorter than the first length (l 1) by half (lambda/2) of the selected wavelength (lambda),
it is characterized in that the preparation method is characterized in that,
the muffler (S) is multi-part and has at least one first part (4) and a second part (5) which are connected to one another as an assembly, wherein at least one channel or a further linear recess is provided in the first part (4) and/or the second part (5), which channel or recess forms one of the individual ducts (31, 32, 33, 34) of the duct arrangement (3) or forms part of one of the individual ducts (31, 32, 33, 34) of the duct arrangement (3), wherein the individual ducts are provided in the assembly.
2. A muffler (S) according to claim 1, characterized in that the first duct (33) extends linearly between the first end and the second end, while the second duct (34) extends oscillatingly, curvilinearly or meanderingly between the first end and the second end.
3. A muffler (S) according to any of the claims 1 to 3, characterized in that the first part (4) is circular or annular and/or the second part (5) is circular or annular.
4. Muffler according to one of claims 1 to 3, characterized in that the muffler (S) has a first connecting piece or a screw (6) which is connected to the first connecting end (1) of the muffler (S) or forms part of the first connecting end (2) or of the first connecting end (2), and/or in that the muffler has a second connecting piece or a screw (7) which is connected to the second connecting end (2) of the muffler (S) or forms part of the second connecting end (2) or of the second connecting end (2).
5. The muffler (S) as claimed in one of claims 1 to 4, characterized in that the first part (4) and/or the second part (5) is/are cast, in particular made of aluminum, aluminum alloy, zinc alloy or plastic.
6. A muffler (S) according to any of the claims 1 to 5, characterized in that the first part (4) and the second part (5) form a housing.
7. Vacuum pump (P) having a pump housing and a pump chamber arranged therein, the pump chamber having a first connection end for a gas flow and a second connection end for a gas flow, characterized in that the vacuum pump has a muffler according to one of claims 1 to 5.
8. A vacuum pump (P) according to claim 7, characterized in that the first connection end of the muffler is connected with the second connection end of the pump chamber of the vacuum pump, and the first part (4) and the second part (5) of the muffler (S) are parts of or are arranged in or fastened to the pump housing.
9. Vacuum pump (P) having a pump housing with a first connection end for a gas flow and a second connection end for a gas flow, characterized in that the vacuum pump has a muffler according to claim 5, the first connection end (1) of which is connected to the second connection end of the pump housing.
CN202180025217.6A 2020-04-02 2021-02-03 Muffler for a vacuum pump and vacuum pump having such a muffler Pending CN115335603A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020109283 2020-04-02
DE102020109283.0 2020-04-02
PCT/EP2021/052484 WO2021197686A1 (en) 2020-04-02 2021-02-03 Silencer for a vacuum pump, and vacuum pump with such a silencer

Publications (1)

Publication Number Publication Date
CN115335603A true CN115335603A (en) 2022-11-11

Family

ID=74556891

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202180025217.6A Pending CN115335603A (en) 2020-04-02 2021-02-03 Muffler for a vacuum pump and vacuum pump having such a muffler

Country Status (3)

Country Link
EP (1) EP4127480A1 (en)
CN (1) CN115335603A (en)
WO (1) WO2021197686A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60222516A (en) * 1984-04-20 1985-11-07 Hitachi Plant Eng & Constr Co Ltd Sound wave interference type silencer
JPS61157745A (en) * 1984-12-28 1986-07-17 Yanmar Diesel Engine Co Ltd Construction of exhaust passage in heat exchanger utilizing engine
US5014816A (en) * 1989-11-09 1991-05-14 E. I. Du Pont De Nemours And Company Silencer for gas induction and exhaust systems
DE4011658A1 (en) 1990-04-11 1991-10-17 Messerschmitt Boelkow Blohm Anti-sound wave generator - incorporates at least fluidic amplifier with input and output connections
US5252788A (en) * 1992-04-10 1993-10-12 Ap Parts Manufacturing Co. Stamp formed muffler with in-line expansion chamber and arcuately formed effective flow tubes
DE4333374C1 (en) 1993-09-30 1995-05-24 Aerzener Maschf Gmbh Sound absorbing device in gas-conveying pipelines
JP3951697B2 (en) * 2001-12-14 2007-08-01 株式会社デンソー Screw type compressor
DE10163812A1 (en) 2001-12-22 2003-07-03 Mann & Hummel Filter Device for sound absorption in a pipe duct
KR102166972B1 (en) * 2015-09-25 2020-10-19 아틀라스 캅코 에어파워, 남로체 벤누트삽 Compressor or vacuum pump cooling method and compressor or vacuum pump using this method
CN110259545B (en) * 2019-07-17 2021-05-07 佛山市秦跃鑫金属制造有限公司 Automobile silencer with high tail gas purification performance

Also Published As

Publication number Publication date
WO2021197686A1 (en) 2021-10-07
EP4127480A1 (en) 2023-02-08

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