WO2013003923A1 - Rod for linear compressor - Google Patents

Rod for linear compressor Download PDF

Info

Publication number
WO2013003923A1
WO2013003923A1 PCT/BR2012/000214 BR2012000214W WO2013003923A1 WO 2013003923 A1 WO2013003923 A1 WO 2013003923A1 BR 2012000214 W BR2012000214 W BR 2012000214W WO 2013003923 A1 WO2013003923 A1 WO 2013003923A1
Authority
WO
WIPO (PCT)
Prior art keywords
rod
section
cross
connecting rod
piston
Prior art date
Application number
PCT/BR2012/000214
Other languages
French (fr)
Inventor
Alisson Luiz Roman
Celso Kenzo Takemori
Ingwald Vollrath
Original Assignee
Whirlpool S.A.
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 Whirlpool S.A. filed Critical Whirlpool S.A.
Publication of WO2013003923A1 publication Critical patent/WO2013003923A1/en

Links

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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric

Definitions

  • the present invention relates to a rod (connecting rod) for interconnecting the piston to the cylinder end of linear compressors, which was designed and developed to provide high axial rigidity, high buckling resistance and low cross rigidity resulting, therefore, in a fairly flexible part (piece) directed, more specifically, to be operated in high frequency linear compressors.
  • Another among the objects of the present invention is to provide a connecting rod for a high frequency linear compressor having the above features in a single part containing a single material composition - that is, that does not require the manufacturing and joining of different parts - involving manufacturing processes and simple assembly.
  • the present invention achieves the above objects by means of a rod or connecting rod for linear compressor - of type that interconnects a piston and a resilient member or resonant spring -comprising an elongated rod produced from a metallic material, which has at least two regions of increased cross section and at least a medial region of reduced cross section, and at least two regions of increased cross section located at the ends of the elongated rod.
  • said elongate rod comprises at least a medial cross section to increase its resistance to the part buckling and facilitate the manufacturing process. It is clarified that regions of reduced cross section of said rod provide the part with transverse flexibility.
  • such elongated rod is produced from steel, titanium or metal alloys containing these materials - which have higher fatigue resistance.
  • the present invention further comprises means for enabling a rod or a connecting rod to be used in high frequency linear compressors simultaneously presenting in a single part a high axial rigidity, high buckling resistance and low cross (transverse) rigidity.
  • Figure 1 - shows a longitudinal sectional view of a compressor driven by linear motor which operates at high frequency in which it is used one of the possible embodiments of the connecting rod / rod for the linear compressor object of the present invention
  • Figure 2 - shows a perspective view of the connecting rod built in accordance with a preferred embodiment of the present invention, provided with a central sector;
  • Figure 3 - shows an elevation view of the object shown in Figure 2;
  • Figure 4 - shows a perspective view of the connecting rod built in accordance with a second preferred embodiment of the present invention, provided with a central sector;
  • Figure 5 - shows an elevation view of the object shown in Figure 4.
  • Figure 1 shows a cross section of the mobile mechanism of a linear compressor in which it is possible to notice a piston 1 attached through the rod or connecting rod 3 object of the present invention, to one of the ends 21 of a resilient member 2 (which in this case is a resonant spring), whose opposite end 22 attaches to a member 6 for fastening the magnet motor 7.
  • a resilient member 2 which in this case is a resonant spring
  • the rod or connecting rod for the concerned linear compressor is defined by an elongated rod 3 made preferably of steel or titanium - or metal alloys containing these materials, which have high resistance to fatigue - or other materials with similar characteristics.
  • the elongated rod 3 which constitutes a connecting rod for the linear compressor has at least two regions 4 of increased cross section, and that in the preferred embodiment of the present invention both ends of the elongated rod 3 have such a high diametrical elevation in order to increase the fastening area of rod 3 to the part that is cooperating - in this case, the surface of the piston 1 and the end 21 of the resilient member 2.
  • Figures 2 and 3 illustrate another constructive possibility to the concerned rod 3, in which the part is provided with a medial region 41 of increased cross section - which can also be called "central sector" - to increase the buckling resistance and facilitate the manufacturing process.
  • the manufacturing facility is due to the fact that the central sector acts as a third support for the tool to carry out the thinning in the region of reduced cross section 5, the other two supporting the two regions 4 having increased cross section.
  • the elongated rod 3 shows medial portions 5 of reduced cross section that confer to the transverse flexible to the part.
  • the material used in the manufacturing thereof - preferably steel or titanium, as mentioned - allow the rod 3 to present some transversal flexibility without incurring a high risk of part disruption or reduction of its life span, since such materials exhibit high resistance to fatigue.
  • the elongated rod 3 has three regions 4 and 41 of increased cross section and two medial portions 5 of reduced cross section; however the number of regions 4 and / or 5 of the elongated rod 3 built according to one of the preferred embodiments of the present invention may vary without thereby going beyond the scope of the claimed protection.
  • Figures 4 and 5 illustrate a shorter rod 3 whose use may be required in equipment where there are restrictions in the space for assembling.
  • the rod 3 does not provide the medial region 41 of increased cross section.
  • the buckling resistance is obtained from the reduced length. Since this shortening results in an increase in transverse rigidity, the most suitable material for such cases is titanium because of its lower elasticity degree when compared to steel.
  • rod or connecting rod 3 object of the present invention relates to the fact of being constituted by a one piece body and that is completely made of a single material or metal alloy, which makes the production and assembling process thereof much simpler than the one observed by using similar known processes - which do not infrequently involve several portions of different materials joined together by any joining processes that, in addition, eventually introduces in the final part weakness points which could compromise the efficiency and reliability of the equipment.
  • the present invention further relates to means for enabling a rod or a connecting rod 3 to be used in high frequency linear compressors simultaneously presenting in a single part a high axial rigidity, high buckling resistance and low cross (transverse) rigidity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Compressor (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

The present invention relates to a rod (connecting rod) for interconnecting the piston to the end of the resilient member of linear compressors preferably operating at high frequency, comprised of an elongated rod (3) having at least two regions (4) with an increased cross section and at least one medial region (5) of reduced cross section, such elongated rod (3) having a great axial rigidity, high buckling resistance and low cross rigidity in a single and unbroken part.

Description

ROD FOR LINEAR COMPRESSOR
Field of the Invention
The present invention relates to a rod (connecting rod) for interconnecting the piston to the cylinder end of linear compressors, which was designed and developed to provide high axial rigidity, high buckling resistance and low cross rigidity resulting, therefore, in a fairly flexible part (piece) directed, more specifically, to be operated in high frequency linear compressors.
Background of the Invention
As it is well known in the art, in the linear compressors, the reciprocating piston movement is directly related to the resonant movement of the mechanism, and its operation requires the use of connecting rods in the form of rods that connect the piston to the resonant member of the compressor, which are usually straight, rigid and have an uniform cross section.
However, that the characteristics of the used connecting rod impact at least two operating important conditions of the compressor: their span life and the noise generated by the operation of the equipment. In this sense, it should be noticed that efforts from the reciprocating motion of the rod and the resonance of the used spring are axial and transverse, and they contribute for the generation of noise from the impact / friction between the piston and the side walls of the cylinder can also cause fatigue failure of the connecting rod or accelerate piston wear, since the greater the cross efforts transmitted from the connecting rod to the piston are, the greater the frictional force between the piston and cylinder is, and the greater the wear rate of the piston is.
By considering those operating conditions, some technical solutions have been developed to overcome the mentioned problems such as, for example, those shown in document PI0500338-BR 5, which discloses the use of a connecting rod consisting of several longitudinal rods of thin cross section arranged side by side along the geometric axis of the driving rod, conferring to the set transverse flexibility and axial rigidity. However, this solution involves a complex construction and assembling process that can significantly increase the final costs of the equipment. Since document JP61274171 provides a flexible connecting rod made of synthetic resin, although being able to absorb part of the working stresses, it can provide axial rigidity lower than the suitable one for the operation in high frequency compressors, and thereby, compromise the efficiency of the process.
Document US2008/0019852, in turn, describes a rigid connecting rod which interconnects the oscillatory member rod by means of thin flexible bars located at the ends of a "translational rod" directed is to facilitate the axial axis rotation of the piston relative to the axial axis of the other end where the rod is attached, as well as to reduce the cross rigidity of the part. However, similarly to the previous citation, the assemble of flexible bars and translational rod can compromise the proper efficiency of the compressor during operation at high frequencies. In addition, the construction involving different materials becomes complex and costly.
It is further recited document US3801167 which discloses the use of a connecting rod said to be flexible of uniform cross section that connects to a piston - guide which, in turn, is secured to an intermediate rod of medial thin section, with the opposite end attached to the working piston of the compressor. This intermediate rod, however, acts only as connecting member between the piston guide and the equipment piston and, therefore, does not act as the connecting rod as in the object of the present invention.
Briefly, it is clear that the current state of the art lacks a solution for a rod / connecting rod capable of providing simultaneously large axial rigidity, high buckling resistance and low cross rigidity in a single part whose manufacturing / assembling process is not complex or costly, which can be used with great efficiency and durability in high operating frequency equipment.
Objects of the Invention
Therefore, it is one of the objects of the present invention to disclose a rod or connecting rod for linear compressor - mainly operating at high frequency - which is provides significant axial rigidity, high buckling resistance and low transverse (cross) rigidity.
Another among the objects of the present invention is to provide a connecting rod for a high frequency linear compressor having the above features in a single part containing a single material composition - that is, that does not require the manufacturing and joining of different parts - involving manufacturing processes and simple assembly.
Summary of the Invention
The present invention achieves the above objects by means of a rod or connecting rod for linear compressor - of type that interconnects a piston and a resilient member or resonant spring -comprising an elongated rod produced from a metallic material, which has at least two regions of increased cross section and at least a medial region of reduced cross section, and at least two regions of increased cross section located at the ends of the elongated rod.
According to a preferred embodiment of the present invention, said elongate rod comprises at least a medial cross section to increase its resistance to the part buckling and facilitate the manufacturing process. It is clarified that regions of reduced cross section of said rod provide the part with transverse flexibility.
Also according to a preferred embodiment of the present invention, such elongated rod is produced from steel, titanium or metal alloys containing these materials - which have higher fatigue resistance.
The present invention further comprises means for enabling a rod or a connecting rod to be used in high frequency linear compressors simultaneously presenting in a single part a high axial rigidity, high buckling resistance and low cross (transverse) rigidity.
Brief Description of the Drawings
The figures show:
Figure 1 - shows a longitudinal sectional view of a compressor driven by linear motor which operates at high frequency in which it is used one of the possible embodiments of the connecting rod / rod for the linear compressor object of the present invention;
Figure 2 - shows a perspective view of the connecting rod built in accordance with a preferred embodiment of the present invention, provided with a central sector;
Figure 3 - shows an elevation view of the object shown in Figure 2;
Figure 4 - shows a perspective view of the connecting rod built in accordance with a second preferred embodiment of the present invention, provided with a central sector; and
Figure 5 - shows an elevation view of the object shown in Figure 4.
Detailed Description of the Invention
The invention will be described in more details based on the above mentioned figures.
Figure 1 shows a cross section of the mobile mechanism of a linear compressor in which it is possible to notice a piston 1 attached through the rod or connecting rod 3 object of the present invention, to one of the ends 21 of a resilient member 2 (which in this case is a resonant spring), whose opposite end 22 attaches to a member 6 for fastening the magnet motor 7.
The rod or connecting rod for the concerned linear compressor is defined by an elongated rod 3 made preferably of steel or titanium - or metal alloys containing these materials, which have high resistance to fatigue - or other materials with similar characteristics.
As it can be seen in the accompanying figures, the elongated rod 3 which constitutes a connecting rod for the linear compressor has at least two regions 4 of increased cross section, and that in the preferred embodiment of the present invention both ends of the elongated rod 3 have such a high diametrical elevation in order to increase the fastening area of rod 3 to the part that is cooperating - in this case, the surface of the piston 1 and the end 21 of the resilient member 2.
Figures 2 and 3 illustrate another constructive possibility to the concerned rod 3, in which the part is provided with a medial region 41 of increased cross section - which can also be called "central sector" - to increase the buckling resistance and facilitate the manufacturing process. The manufacturing facility is due to the fact that the central sector acts as a third support for the tool to carry out the thinning in the region of reduced cross section 5, the other two supporting the two regions 4 having increased cross section. In both embodiments, the elongated rod 3 shows medial portions 5 of reduced cross section that confer to the transverse flexible to the part. In this respect, it is worth stressing that the material used in the manufacturing thereof - preferably steel or titanium, as mentioned - allow the rod 3 to present some transversal flexibility without incurring a high risk of part disruption or reduction of its life span, since such materials exhibit high resistance to fatigue.
In Figures 2 and 3, the elongated rod 3 has three regions 4 and 41 of increased cross section and two medial portions 5 of reduced cross section; however the number of regions 4 and / or 5 of the elongated rod 3 built according to one of the preferred embodiments of the present invention may vary without thereby going beyond the scope of the claimed protection.
In turn, Figures 4 and 5 illustrate a shorter rod 3 whose use may be required in equipment where there are restrictions in the space for assembling. In this case, the rod 3 does not provide the medial region 41 of increased cross section. It should be clarified that in this configuration having only a medial region 5 (which, therefore, sets a part that is shorter than the conventional one), the buckling resistance is obtained from the reduced length. Since this shortening results in an increase in transverse rigidity, the most suitable material for such cases is titanium because of its lower elasticity degree when compared to steel.
An important feature of the rod or connecting rod 3 object of the present invention relates to the fact of being constituted by a one piece body and that is completely made of a single material or metal alloy, which makes the production and assembling process thereof much simpler than the one observed by using similar known processes - which do not infrequently involve several portions of different materials joined together by any joining processes that, in addition, eventually introduces in the final part weakness points which could compromise the efficiency and reliability of the equipment.
Briefly, the present invention further relates to means for enabling a rod or a connecting rod 3 to be used in high frequency linear compressors simultaneously presenting in a single part a high axial rigidity, high buckling resistance and low cross (transverse) rigidity.
It should be noted that although having been shown preferred constructive forms of the present invention, it is understood that any omissions, substitutions and constructive alterations may be accomplished by a person skilled in the art, without departing from the spirit and scope of the required protection. It is also expressly stated that all combinations of elements that perform the same function in substantially the same way in order to achieve the same results are within the scope of the invention. Substitutions of elements of a described embodiment with others are also fully intended and encompassed.
It should however be understood that the description given above based on figures above relates just to one of possible embodiments for the system of the present invention, the actual scope of the object of the invention being defined in the appended claims.

Claims

1. Rod or connecting rod for linear compressor, more particularly for interconnecting a piston (1 ) and a resilient member or resonant spring (2) characterized in that it comprises: an elongated rod (3) produced from metallic material, this rod (3) having at least two regions (4) having increased cross section and at least a medial region (5) of reduced cross section, and at least two regions (4) with increased cross section being located at the ends of the elongated rod (3), and
means for enabling a rod or a connecting rod to be used in high frequency linear compressors simultaneously presenting in single part a high axial rigidity, high buckling resistance and low cross rigidity.
2. Rod according to claim 1 , characterized in that the elongated rod (3) comprises at least a medial region (41 ) of high cross - section.
3. Rod according to claim 1 , characterized in that the elongated rod (3) is produced from steel, titanium or metal alloys containing those materials.
PCT/BR2012/000214 2011-07-04 2012-06-21 Rod for linear compressor WO2013003923A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI1103357-6 2011-07-04
BRPI1103357 BRPI1103357A2 (en) 2011-07-04 2011-07-04 rod or connecting rod for linear compressor

Publications (1)

Publication Number Publication Date
WO2013003923A1 true WO2013003923A1 (en) 2013-01-10

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PCT/BR2012/000214 WO2013003923A1 (en) 2011-07-04 2012-06-21 Rod for linear compressor

Country Status (4)

Country Link
AR (1) AR087057A1 (en)
BR (1) BRPI1103357A2 (en)
TW (1) TW201314042A (en)
WO (1) WO2013003923A1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9322401B2 (en) 2014-02-10 2016-04-26 General Electric Company Linear compressor
US9429150B2 (en) 2014-02-10 2016-08-30 Haier US Appliances Solutions, Inc. Linear compressor
US9470223B2 (en) 2014-02-10 2016-10-18 Haier Us Appliance Solutions, Inc. Method for monitoring a linear compressor
US9506460B2 (en) 2014-02-10 2016-11-29 Haier Us Appliance Solutions, Inc. Linear compressor
US9518572B2 (en) 2014-02-10 2016-12-13 Haier Us Appliance Solutions, Inc. Linear compressor
US9528505B2 (en) 2014-02-10 2016-12-27 Haier Us Appliance Solutions, Inc. Linear compressor
US9562525B2 (en) 2014-02-10 2017-02-07 Haier Us Appliance Solutions, Inc. Linear compressor
US9702352B2 (en) 2014-10-27 2017-07-11 Haier Us Appliance Solutions, Inc. Linear compressor and a spring assembly
US9739270B2 (en) 2014-02-10 2017-08-22 Haier Us Appliance Solutions, Inc. Linear compressor
US9841012B2 (en) 2014-02-10 2017-12-12 Haier Us Appliance Solutions, Inc. Linear compressor
US10036370B2 (en) 2014-02-10 2018-07-31 Haier Us Appliance Solutions, Inc. Linear compressor
US10174753B2 (en) 2015-11-04 2019-01-08 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10208741B2 (en) 2015-01-28 2019-02-19 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10502201B2 (en) 2015-01-28 2019-12-10 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10641263B2 (en) 2017-08-31 2020-05-05 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10670008B2 (en) 2017-08-31 2020-06-02 Haier Us Appliance Solutions, Inc. Method for detecting head crashing in a linear compressor
US10830230B2 (en) 2017-01-04 2020-11-10 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109236632B (en) * 2018-11-16 2023-08-15 漯河安润设备有限公司 High-pressure plunger capable of detecting oil outlet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801167A (en) 1970-04-07 1974-04-02 Burckhardt Ag Maschf Device for centrally guiding the working piston in the working cylinders of high-pressure compressors or pumps
JPS61274171A (en) 1985-05-27 1986-12-04 Honda Motor Co Ltd Cylinder apparatus
US5525845A (en) * 1994-03-21 1996-06-11 Sunpower, Inc. Fluid bearing with compliant linkage for centering reciprocating bodies
WO2006081642A2 (en) * 2005-02-01 2006-08-10 Whirlpool S.A. 'driving rod for the piston of a reciprocating compressor'
US20080019852A1 (en) 2004-12-23 2008-01-24 Jan Brand Linear Compressor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3801167A (en) 1970-04-07 1974-04-02 Burckhardt Ag Maschf Device for centrally guiding the working piston in the working cylinders of high-pressure compressors or pumps
JPS61274171A (en) 1985-05-27 1986-12-04 Honda Motor Co Ltd Cylinder apparatus
US5525845A (en) * 1994-03-21 1996-06-11 Sunpower, Inc. Fluid bearing with compliant linkage for centering reciprocating bodies
US20080019852A1 (en) 2004-12-23 2008-01-24 Jan Brand Linear Compressor
WO2006081642A2 (en) * 2005-02-01 2006-08-10 Whirlpool S.A. 'driving rod for the piston of a reciprocating compressor'

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9739270B2 (en) 2014-02-10 2017-08-22 Haier Us Appliance Solutions, Inc. Linear compressor
US9518572B2 (en) 2014-02-10 2016-12-13 Haier Us Appliance Solutions, Inc. Linear compressor
US9322401B2 (en) 2014-02-10 2016-04-26 General Electric Company Linear compressor
US9506460B2 (en) 2014-02-10 2016-11-29 Haier Us Appliance Solutions, Inc. Linear compressor
US9841012B2 (en) 2014-02-10 2017-12-12 Haier Us Appliance Solutions, Inc. Linear compressor
US9528505B2 (en) 2014-02-10 2016-12-27 Haier Us Appliance Solutions, Inc. Linear compressor
US9562525B2 (en) 2014-02-10 2017-02-07 Haier Us Appliance Solutions, Inc. Linear compressor
US10036370B2 (en) 2014-02-10 2018-07-31 Haier Us Appliance Solutions, Inc. Linear compressor
US9470223B2 (en) 2014-02-10 2016-10-18 Haier Us Appliance Solutions, Inc. Method for monitoring a linear compressor
US9429150B2 (en) 2014-02-10 2016-08-30 Haier US Appliances Solutions, Inc. Linear compressor
US9702352B2 (en) 2014-10-27 2017-07-11 Haier Us Appliance Solutions, Inc. Linear compressor and a spring assembly
US10208741B2 (en) 2015-01-28 2019-02-19 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10502201B2 (en) 2015-01-28 2019-12-10 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10174753B2 (en) 2015-11-04 2019-01-08 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10830230B2 (en) 2017-01-04 2020-11-10 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10641263B2 (en) 2017-08-31 2020-05-05 Haier Us Appliance Solutions, Inc. Method for operating a linear compressor
US10670008B2 (en) 2017-08-31 2020-06-02 Haier Us Appliance Solutions, Inc. Method for detecting head crashing in a linear compressor

Also Published As

Publication number Publication date
TW201314042A (en) 2013-04-01
AR087057A1 (en) 2014-02-12
BRPI1103357A2 (en) 2013-07-23

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