EP1657440A1 - Grille de protection avec canal pour guider l'air de refroidissement vers un cylindre de piston - Google Patents

Grille de protection avec canal pour guider l'air de refroidissement vers un cylindre de piston Download PDF

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Publication number
EP1657440A1
EP1657440A1 EP05023696A EP05023696A EP1657440A1 EP 1657440 A1 EP1657440 A1 EP 1657440A1 EP 05023696 A EP05023696 A EP 05023696A EP 05023696 A EP05023696 A EP 05023696A EP 1657440 A1 EP1657440 A1 EP 1657440A1
Authority
EP
European Patent Office
Prior art keywords
pump
fan
cooling flow
channel
fan guard
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.)
Withdrawn
Application number
EP05023696A
Other languages
German (de)
English (en)
Inventor
Gary S. Hueppchen
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.)
Thomas Industries Inc
Original Assignee
Thomas Industries Inc
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 Thomas Industries Inc filed Critical Thomas Industries Inc
Publication of EP1657440A1 publication Critical patent/EP1657440A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04B39/066—Cooling by ventilation

Definitions

  • the invention relates generally to the field of pumps, such as compressors and vacuum pumps, and more particularly, to a compressor having a fan guard with a channel to direct cooling air to a piston cylinder.
  • Reciprocating piston or diaphragm pumps typically have a metal housing, for example, a cast aluminum alloy, in which bearings are mounted which journal the shaft which drives the pump.
  • a metal housing is needed, particularly for larger pumps, to withstand the forces of driving the piston or diaphragm and containing the pressure exerted in the compression chamber of the pump.
  • a rotary electric motor is usually used to drive these pumps and the motor requires cooling.
  • the motor is provided between two housings, each of which is separate from the other and houses one compression chamber.
  • the shaft of the motor is a through shaft so that each end of the shaft mounts one of the pistons or diaphragms that work to vary the volume of the compression chamber in the housing at the corresponding end of the shaft.
  • a rotary fan blade is mounted to each end of the shaft to draw a flow of cooling air into the housing at that end and blow it onto the rotor and stator coils of the motor.
  • the part of the housing in which the rotary fan blade is mounted circular and just slightly larger than the diameter of the fan blade.
  • the clearance between the tips of the fan blades and the interior housing surface should be as small as possible because, if not, the air drawn into the housing by the fan blades will simply blow back out past the tips of the blade, and not be directed over the coils of the motor.
  • the pump is contained inside of a separate enclosure, it may be permissible to leave open the end of the housing at which the fan blade is mounted.
  • the end of the housing must be closed with a cover that permits air to be drawn into the housing, but prevents the insertion of larger objects or fingers. This cover, typically called a fan guard, should not deleteriously affect the operation of the fan nor add to the lateral size or detract from the appearance of the fan.
  • the effectiveness of the cooling system in reducing the stator temperature of the motor affects the range of applications in which the pump may be employed.
  • the voltage at which the motor is driven and the output pressure of the pump affect the amount of heat that is generated in the motor. More effective cooling expands the range of applications suitable for a given pump and motor.
  • the motor is not the only temperature-sensitive component in a pump.
  • Wobble pistons are sometimes used in oil-less air compressors and vacuum pumps.
  • a wobble piston includes a peripheral seal on the piston head that engages the cylinder bore.
  • the piston head and its connecting rod are fixed to each other, and the connecting rod is mounted on an eccentric on a shaft. As the eccentric is turned by the shaft, the wobble piston is moved in and out and "wobbles" from side to side.
  • Wobble pistons typically employ a Teflon® or other similar material disc or cup which serves both as a guide for the wobble piston and as a pneumatic seal between the piston and the wall of the cylinder in which it moves.
  • the working surface of the cylinder has a hardened polished surface, providing a smooth surface for cooperating with the Teflon® seal of the piston.
  • the service life of the Teflon® material depends in part on the temperature of the cylinder with which the seal interfaces. A higher temperature typically corresponds to a shorter service life due to increased friction between the cup and the cylinder wall.
  • the bearings used to support the motor shaft also have a service life determined at least in part by temperature. Generally, a higher bearing temperature equates to a shorter bearing service life.
  • cooling efficiency not only affects the range of applications for a particular pump, but also the service life of temperature-sensitive components in the pump.
  • the present invention addresses these problems.
  • the present invention is directed generally to a fan guard that directs cooling air flow to a piston cylinder.
  • a pump including a housing, a shaft supported by the housing, a piston assembly, a fan blade, and a fan guard.
  • the piston assembly includes a piston cylinder and is operably coupled to the shaft.
  • the fan blade is operable to generate cooling flow.
  • the fan guard is mounted to the housing and includes a channel configured to direct at least a first portion of the cooling flow to the piston cylinder.
  • Another aspect of the present invention is seen in a fan guard.
  • the fan guard includes a front surface defining a cooling flow opening and sidewalls defining a channel having a first end proximate the cooling flow opening.
  • a baffle is positioned proximate a second end of the channel.
  • Figure 1 is an isometric view of a pump in accordance with one embodiment of the present invention
  • Figure 2 is a partial cross section view of the pump of Figure 1;
  • FIG 3 is an end view of the pump of Figure 1 with the fan guard removed;
  • Figure 4 is an isometric back view of a fan guard employed in the pump of Figure 1.
  • FIG. 1 illustrates a pump 10 of the invention having a motor 12 with a housing 14 at one end and a housing 16 at the other.
  • the housings 14, 16 are cast of aluminum alloy and are essentially identical.
  • a head assembly 18, which includes head members 20, 22 and connecting tubes 24, 26, is bolted to the housings 14, 16 above respective compression chamber portions 28, 30 of the housings 14, 16 to help hold the housings 14, 16 together and maintain their angular position with respect to each other.
  • the pump 10 also includes fan guards 32, one at each end, which are essentially identical to one another.
  • the pump 10 of the present invention may be employed in a variety of applications, including but not limited to cable drying, sewage aeration, tire inflation, etc.
  • FIG. 2 and 3 a partial cross section view of the pump 10 and an end view of the pump 10 with the fan guard 32 removed are shown, respectively.
  • the motor 12 has a shaft 34 which extends through it and into both housings 14, 16, nearly to the end of each respective housing 14, 16.
  • both housings 14, 16 are essentially identical, only the housing 14 is shown in Figure 2.
  • Each end of the shaft 34 mounts a rotary fan blade 36 which is rotated by the shaft 34 within a fan cavity 37 defined by the housing 14 in a direction so as to draw air into each respective housing 14, 16 and direct it over the coils of the motor 12 ( i . e ., an axial component of the cooling flow).
  • the rotary fan blade 36 is secured to the shaft 34 using a spring clip 38.
  • the housings 14, 16 are provided with ventilation slots 39 to allow the exhausting of cooling air.
  • the housings 14, 16 mount bearings 40 which journal the shaft 34.
  • the housings 14, 16 also have openings (not shown) in them which provide for the axial through-flow of air so that air moved by the fan blade 36 reaches the coils of the motor 12.
  • the pump 10 includes a piston assembly 42 including a piston cylinder 44 and a piston head 46 operating within the piston cylinder 44 to compress the operating fluid (e.g., air) to provide the pumping action.
  • the piston head 46 is coupled by a connecting rod 48 to an eccentric 50 fixed to the shaft 34. In operation, the shaft 34 and attached eccentric 50 rotates causing the connecting rod 48 and piston head 46 to move within the piston cylinder 44.
  • a flapper valve (not shown) mounted to the valve plate 52 allows the air to enter the piston cylinder 44 on the downstroke of the piston cycle and seals to prevent air passage on the upstroke.
  • the piston head 46 also includes a piston cup 54 constructed of Teflon® or other similar material that provides a sliding seal between the piston head 46 and the piston cylinder 44.
  • the piston cup 54 has a service life that may vary based on the temperature of the piston cylinder 44, with a higher cylinder temperature resulting in a shorter service life.
  • the fan guard 32 also directs cooling flow over the piston cylinder 44 to dissipate heat generated during the compression process.
  • the housings 14, 16 includes openings 56 (shown in Figure 1) to allow the exhaust of cooling air directed over the piston cylinder 44.
  • the fan guard 32 defines a cooling flow opening 57 in its front surface to provide for the passage of cooling flow past the fan guard 32.
  • the fan guard includes rib members 58 spanning the cooling flow opening 57 and support members 60 running perpendicular to the rib members 58.
  • the spacing and arrangement of the rib and support members 58, 60 may vary depending on the particular implementation.
  • the rib and support members 58, 60 are arranged to allow the passage of cooling flow, but to prevent foreign objects from entering the area proximate the moving rotary fan blade 36.
  • the fan guard 32 is made of a resilient plastic resin, such as a polyester polymer.
  • the fan guard 32 includes a tab 62 that interfaces with a corresponding notch 64 (shown in Figure 2) in the housing 14 to secure the bottom portion of the fan guard 32 to the housing 16.
  • Mounting holes 66 are defined in the fan guard 32 to allow the passage of screws for securing the fan guard 32 to the housing 14 via corresponding holes 68 (shown in Figure 3) in the housing 14. Any means may be used to secure the fan guard 32 to the housing 14.
  • the fan guard 32 includes sidewalls 70 that define a channel 72.
  • the channel 72 terminates in a baffle 74 that changes the direction of radial cooling flow generated by the rotary fan blade 36 to impinge on the piston cylinder 44, as indicated by the arrow 76 shown in Figure 2.
  • the sidewalls 70 also define a flared portion 78 that collects the radial air flow and directs the flow into the channel 72.
  • the rotary fan blade 36 includes an extended hub 80 that abuts the eccentric 50 to positively locate the rotary fan blade 36 along the shaft 34 within the fan cavity 37.
  • the rotary fan blade 36 is positioned to optimize the cooling provided to the piston cylinder 44 by the cooling flow redirected by the fan guard 32.
  • the optimal shaft position may be determined empirically and may vary depending on the particular geometry of the pump 10.
  • the rotary fan blade 36 extends axially beyond the fan cavity 37 defined by the housing 14 into the space bounded by the fan guard 32. This position has been found to increase the effectiveness of the fan guard 32 in redirecting the radial air flow to cool the piston cylinder 44.
  • Redirecting cooling flow over the piston cylinder 44 reduces the operating temperature of the piston assembly 42.
  • the combination of the rotary fan blade 36 and fan guard 32 also reduces the temperature of the bearings 40 and the motor 12. Such temperature reductions increase the operating lives of the piston cup 54 and the bearings 40 for a given set of operating conditions.
  • the improved heat dissipation characteristics may also be employed to extend the operating range of the pump 10 to allow operation at higher pressures, different voltages, and/or lower frequency voltage inputs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP05023696A 2004-11-12 2005-10-28 Grille de protection avec canal pour guider l'air de refroidissement vers un cylindre de piston Withdrawn EP1657440A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/986,752 US20060104833A1 (en) 2004-11-12 2004-11-12 Fan guard having channel to direct cooling air to a piston cylinder

Publications (1)

Publication Number Publication Date
EP1657440A1 true EP1657440A1 (fr) 2006-05-17

Family

ID=35432504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05023696A Withdrawn EP1657440A1 (fr) 2004-11-12 2005-10-28 Grille de protection avec canal pour guider l'air de refroidissement vers un cylindre de piston

Country Status (4)

Country Link
US (1) US20060104833A1 (fr)
EP (1) EP1657440A1 (fr)
CN (1) CN1818380A (fr)
CA (1) CA2523995A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107110136A (zh) * 2014-09-19 2017-08-29 克诺尔轨道车辆系统有限公司 包括外部的冷却空气引导装置的多级活塞式压缩机

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090148319A1 (en) * 2007-12-05 2009-06-11 Industrial Technology Research Institute Linear compressor with permanent magnets
DE102010015496B4 (de) * 2010-04-16 2018-07-12 Gedore Torque Solutions Gmbh Gehäuse für ein Hydraulikaggregat
US8899378B2 (en) 2011-09-13 2014-12-02 Black & Decker Inc. Compressor intake muffler and filter
AU2012216658B2 (en) 2011-09-13 2016-09-15 Black & Decker Inc Method of reducing air compressor noise
EP2626566B1 (fr) * 2012-02-08 2021-07-28 Grundfos Holding A/S Moteur électrique
US10436188B2 (en) * 2014-04-30 2019-10-08 Mat Industries, Llc Compressor shroud having integral muffler and inertial filter
US11111913B2 (en) 2015-10-07 2021-09-07 Black & Decker Inc. Oil lubricated compressor
CN112555119A (zh) * 2020-12-02 2021-03-26 东莞市莱诺机电科技有限公司 无油真空泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186317A (en) * 1976-10-07 1980-01-29 Sisk Hollis D Endplate with cast-in baffle
WO2001038743A1 (fr) * 1999-11-29 2001-05-31 Thomas Industries Inc. Carter de pompe
WO2001069083A2 (fr) * 2000-03-10 2001-09-20 Thomas Industries Inc. Ensemble compresseur comportant un deflecteur
US20040217661A1 (en) * 2003-05-01 2004-11-04 Frank Peter L. Fan baffle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190402A (en) * 1975-05-06 1980-02-26 International Telephone And Telegraph Corporation Integrated high capacity compressor
DE3032518C2 (de) * 1980-08-29 1993-12-23 Duerr Dental Gmbh Co Kg Ölfreier Verdichter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4186317A (en) * 1976-10-07 1980-01-29 Sisk Hollis D Endplate with cast-in baffle
WO2001038743A1 (fr) * 1999-11-29 2001-05-31 Thomas Industries Inc. Carter de pompe
WO2001069083A2 (fr) * 2000-03-10 2001-09-20 Thomas Industries Inc. Ensemble compresseur comportant un deflecteur
US20040217661A1 (en) * 2003-05-01 2004-11-04 Frank Peter L. Fan baffle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107110136A (zh) * 2014-09-19 2017-08-29 克诺尔轨道车辆系统有限公司 包括外部的冷却空气引导装置的多级活塞式压缩机
US10323629B2 (en) 2014-09-19 2019-06-18 KNORR-BREMSE Systeme fuer Nuttzfahrzeuge GmbH Multi-stage piston compressor having an outer cooling air conduction system
CN107110136B (zh) * 2014-09-19 2019-08-09 克诺尔轨道车辆系统有限公司 包括外部的冷却空气引导装置的多级活塞式压缩机

Also Published As

Publication number Publication date
CN1818380A (zh) 2006-08-16
CA2523995A1 (fr) 2006-05-12
US20060104833A1 (en) 2006-05-18

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