WO2012159185A1 - Piston for alternative compressor - Google Patents

Piston for alternative compressor Download PDF

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Publication number
WO2012159185A1
WO2012159185A1 PCT/BR2012/000155 BR2012000155W WO2012159185A1 WO 2012159185 A1 WO2012159185 A1 WO 2012159185A1 BR 2012000155 W BR2012000155 W BR 2012000155W WO 2012159185 A1 WO2012159185 A1 WO 2012159185A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
tubular wall
accordance
diameter
wall
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.)
Ceased
Application number
PCT/BR2012/000155
Other languages
French (fr)
Inventor
Paulo Rogério Carrara COUTO
Celso Kenzo Takemori
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.)
Whirlpool SA
Original Assignee
Whirlpool SA
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 SA filed Critical Whirlpool SA
Publication of WO2012159185A1 publication Critical patent/WO2012159185A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • 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
    • F04B35/045—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 using solenoids

Definitions

  • the present invention refers to a piston for alternative compressor and, more specifically, to a piston for linear compressor.
  • a compressor has a function of increasing pressure of a determined volume of fluid to a pressure required for the carrying out of a cooling cycle.
  • alternative compressors where a piston reciprocatedly slides within a cylinder to compress gases.
  • a lubricant oil is provided between the moving parts; however, for some applications in linear compressors the presence of oil is deleterious.
  • an object of the present invention is to provide a piston for an alternative compressor which will make its movement within the cylinder easier, preventing direct impact between the walls and reducing wear of the piston/cylinder set.
  • Another object of the present invention is to provide a piston for an alternative compressor, which reduces gas escape through the gap between the piston and cylinder when said piston is at the end of its compression course.
  • Said piston for alternative compressor provides a piston capable of effecting a reciprocating movement within a compressor cylinder enclosed by a substantially tubular wall with an end closed by an end wall and an open end with a distal edge.
  • the tubular wall extension has a dimension analogously proportional to about two to four times the tubular wall diameter.
  • said longitudinal extension of the piston tubular wall has about three times the diameter size of the tubular wall.
  • said longitudinal extension of the tubular wall is from twenty to forty millimeters in length, and said tubular wall diameter is from six to fourteen millimeters in diameter. More specifically, and, in accordance with the present invention, the longitudinal extension of the tubular wall preferably has thirty millimeters in length, and preferably a tubular wall diameter of ten millimeters.
  • the closed end of said tubular wall comprises a bevel extending to the outer surface of said wall end
  • the open end of the tubular wall comprises a bevel extending up to the upper surface of the distal edge.
  • each of said bevels has an inclination at an angle defined by the recession and longitudinal extension of the outer surface of the end wall or outer surface of the distal edge.
  • each of said bevels preferably has an extension of from one to three millimeters.
  • Figure 1 illustrates a perspective view of a piston in accordance with the preferred embodiment of the present invention.
  • Figure 2 illustrates a cut view of said piston depicted in Figure 1.
  • Figure 3 illustrates an enlarged view of detail "X" depicted in Figure 2.
  • Figure 1 illustrates a perspective view of a preferred embodiment of a piston for alternative compressor of the present invention.
  • Said piston depicted in Figure 2 is designed to effect a reciprocating movement within a (not illustrated) compressor cylinder.
  • Said piston illustrated in Figure 2 comprises a substantially tubular wall 1 having an end 2 closed by a wall end 2a and an open end 2 with a distal edge 3a. Said closed end 2 is known as piston top.
  • a longitudinal extension L of a tubular wall 1 has a size analogously proportional to two to four times diameter D of said tubular wall 1.
  • Such a proportion is important to minimize wear and power consumption during linear movement within the cylinder because it makes difficult the bending of said piston during its course. Moreover, said proportion allows for the piston to minimize gas escape through the gap between the piston and the cylinder when said piston is along the end of its compression course since a piston having such dimensions more suitably seals a compression chamber.
  • said longitudinal extension L of said piston has about three times the diameter D of the cross-section of tubular wall 1.
  • said piston has thirty millimeters in length and ten millimeters in diameter.
  • the piston of the present invention comprises a bevel 4 disposed at the close end 2 of tubular wall 1.
  • the piston of the present invention further comprises a second bevel 5 disposed at the open end 3 of tubular wall 1. Said second bevel 5 extends to a distal edge 3a of said open end 3 of tubular wall 1.
  • Both bevel 4 and bevel 5 have an inclination at an angle defined by a recess V and a longitudinal extension W.
  • V and W are such that correspond to the following relationships: V - (c * W) / L, where c stands for a diametral gap between the piston and (not shown) cylinder; L stands for the piston longitudinal extension; and W stands for the longitudinal extension of bevel 4 or 5.
  • said longitudinal extension W of each of bevels 4 and 5 has about one to three millimeters in extension and diametral gap c has about twenty-five thousandths of millimeter.
  • At least one of said bevels 4 and 5, in function of their inclination are maintained apt to be parallel to the inner surface of the (not shown) cylinder when a total inclination of the piston/cylinder set occurs.

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 present invention refers to a piston for an alternative compressor type which effects a reciprocating movement within a compressor cylinder, and comprises a substantially tubular wall (1 ) with an end (2) closed by a end wall (2a) and an open end (3) with distal edge (3a); a longitudinal extension (L) of said tubular wall (1 ) having a dimension analogously proportional to about two to four times the diameter (D) of said tubular wall (1 ); the closed end (2) of tubular wall (1 ) comprising a bevel (4) extending up to the outer surface of the end wall (2a); and said open end (3) of tubular wall (1 ) comprising a bevel (5) extending up to the outer surface of distal edge (3a).

Description

"PISTON FOR ALTERNATIVE COMPRESSOR"
Field of the Invention
The present invention refers to a piston for alternative compressor and, more specifically, to a piston for linear compressor.
Background of the Invention
A compressor has a function of increasing pressure of a determined volume of fluid to a pressure required for the carrying out of a cooling cycle. There are known in the art the thus-called alternative compressors where a piston reciprocatedly slides within a cylinder to compress gases.
Contact between a reciprocating piston and a cylinder can generate great mechanical losses, and may result in mechanical wear and premature compressor failure, increase in operational temperature, increase in the compressor vibration, and efficiency lost, thus also contributing to increase in power consumption of the equipment.
In some compressor types, a lubricant oil is provided between the moving parts; however, for some applications in linear compressors the presence of oil is deleterious.
Hence, one drawback presented by the linear movement of a piston inside a cylinder is associated with piston bending during its linear path.
Bending of a cylinder during its linear path within the cylinder may result in a direct impact between the parts, causing damage to both inner surface of the cylinder and outer surface of the piston. Additionally, this impact prevents the piston from moving correctly, leading to operation inefficiency. Another important drawback related to a piston for an alternative compressor without lubricant oil lays in the fact that same has no ability to prevent gas escape through the gap between piston and cylinder when said piston is along its compression course. The absence of oil in said gap between the piston and cylinder may end up leading to gas escape, thus causing a great harm to compressor efficiency.
Objects of the Invention
Therefore, an object of the present invention is to provide a piston for an alternative compressor which will make its movement within the cylinder easier, preventing direct impact between the walls and reducing wear of the piston/cylinder set.
Another object of the present invention is to provide a piston for an alternative compressor, which reduces gas escape through the gap between the piston and cylinder when said piston is at the end of its compression course.
Summary of the Invention
The objects of the present invention are fully accomplished by the presently dis- closed piston for alternative compressor.
Said piston for alternative compressor provides a piston capable of effecting a reciprocating movement within a compressor cylinder enclosed by a substantially tubular wall with an end closed by an end wall and an open end with a distal edge. The tubular wall extension has a dimension analogously proportional to about two to four times the tubular wall diameter.
Preferably, said longitudinal extension of the piston tubular wall has about three times the diameter size of the tubular wall. Also preferably, said longitudinal extension of the tubular wall is from twenty to forty millimeters in length, and said tubular wall diameter is from six to fourteen millimeters in diameter. More specifically, and, in accordance with the present invention, the longitudinal extension of the tubular wall preferably has thirty millimeters in length, and preferably a tubular wall diameter of ten millimeters.
Further, in accordance with the present invention, the closed end of said tubular wall comprises a bevel extending to the outer surface of said wall end, and the open end of the tubular wall comprises a bevel extending up to the upper surface of the distal edge. In this regard, each of said bevels has an inclination at an angle defined by the recession and longitudinal extension of the outer surface of the end wall or outer surface of the distal edge.
Preferably, each of said bevels preferably has an extension of from one to three millimeters.
Brief Description of Drawings
Figures show:
Figure 1 illustrates a perspective view of a piston in accordance with the preferred embodiment of the present invention.
Figure 2 illustrates a cut view of said piston depicted in Figure 1.
Figure 3 illustrates an enlarged view of detail "X" depicted in Figure 2.
Detailed Description of the Invention
Next, the present invention will be described in more details based on the working examples represented by the appended drawings.
Figure 1 illustrates a perspective view of a preferred embodiment of a piston for alternative compressor of the present invention.
Said piston depicted in Figure 2 is designed to effect a reciprocating movement within a (not illustrated) compressor cylinder.
Said piston illustrated in Figure 2 comprises a substantially tubular wall 1 having an end 2 closed by a wall end 2a and an open end 2 with a distal edge 3a. Said closed end 2 is known as piston top.
In the piston of the present invention, a longitudinal extension L of a tubular wall 1 has a size analogously proportional to two to four times diameter D of said tubular wall 1.
Such a proportion is important to minimize wear and power consumption during linear movement within the cylinder because it makes difficult the bending of said piston during its course. Moreover, said proportion allows for the piston to minimize gas escape through the gap between the piston and the cylinder when said piston is along the end of its compression course since a piston having such dimensions more suitably seals a compression chamber.
In the preferred embodiment of the present invention, said longitudinal extension L of said piston has about three times the diameter D of the cross-section of tubular wall 1. Hence, in the preferred embodiment, said piston has thirty millimeters in length and ten millimeters in diameter.
The piston of the present invention comprises a bevel 4 disposed at the close end 2 of tubular wall 1.
The piston of the present invention further comprises a second bevel 5 disposed at the open end 3 of tubular wall 1. Said second bevel 5 extends to a distal edge 3a of said open end 3 of tubular wall 1.
Both bevel 4 and bevel 5 have an inclination at an angle defined by a recess V and a longitudinal extension W.
Preferably, dimensions V and W are such that correspond to the following relationships: V - (c*W) / L, where c stands for a diametral gap between the piston and (not shown) cylinder; L stands for the piston longitudinal extension; and W stands for the longitudinal extension of bevel 4 or 5.
In the preferred embodiment of the present invention, said longitudinal extension W of each of bevels 4 and 5 has about one to three millimeters in extension and diametral gap c has about twenty-five thousandths of millimeter.
At least one of said bevels 4 and 5, in function of their inclination are maintained apt to be parallel to the inner surface of the (not shown) cylinder when a total inclination of the piston/cylinder set occurs.
It should be understood that the description provided herein on the basis of figures above only refers to one of the possible embodiments of the object of the present invention, wherein the true scope of the invention is defined by the appended claims.

Claims

1. Piston for alternative compressor, which provides a piston capable of effecting a reciprocating movement within the compressor cylinder comprised of a substantially tubular wall (1 ) with an end (2) closed by an end wall (2a) and an open end (3) with a distal edge (3a), CHARACTERIZED in that:
a longitudinal extension (L) of tubular wall (1 ) has a dimension analogously proportional to about two to four times diameter (D) of the tubular wall (1 ).
2. Piston, in accordance with claim 1 , CHARACTERIZED in that the longitudinal extension (I) of tubular wall (1 ) of the piston has about three times the dimension of diameter (D) of tubular wall (1 ).
3. Piston, in accordance with claim 2, CHARACTERIZED in that the longitudinal extension (L) of tubular wall (1 ) has forty millimeters in length, and diameter (D) of tubular wall (1 ) has between six and fourteen millimeters in diameter.
4. Piston, in accordance with claim 2, CHARACTERIZED in that the longitudinal (L) of tubular wall (1 ) preferably has thirty millimeters in length, and the diameter (D) of tubular wall (1 ) preferably has ten millimeters in diameter.
5. Piston, in accordance with claim 1 , CHARACTERIZED in that:
the close end (2) of tubular wall (1 ) compriss a bevel (4) that extends up to the outer surface of the end wall (2a); and
the open end (3) of tubular wall (1 ) comprises a bevel (5) which extends up to the outer surface of the distal edge (3a).
6. Piston, in accordance with claim 5, CHARACTERIZED in that said bevel (4) has an inclination at an angle is defined by recess (V) and the longitudinal extension (W) of the outer surface of the end wall (2a).
7. Piston, in accordance with claim 5, CHARACTERIZED in that said bevel (5) has an inclination at an angle which is defined by the recess (V) and longitudinal extension (W) of the outer surface of the distal edge (3a).
8. Piston, in accordance with claim 6 or 7, CHARACTERIZED in that the dimensions (V) and (W) are such that they correspond to the following relationships: V = (c*W) / L.
9. Piston, in accordance with claim 5, CHARACTERIZED in that each of said bezels
(4) and (5) preferably has an extension of one to three millimeters.
10. Piston, in accordance with claim 8, CHARACTERIZED in that a diametral gap c has about twenty-fives thousandths of a millimeter.
PCT/BR2012/000155 2011-05-26 2012-05-24 Piston for alternative compressor Ceased WO2012159185A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI1102532-8 2011-05-26
BRPI1102532 BRPI1102532A2 (en) 2011-05-26 2011-05-26 reciprocating compressor piston

Publications (1)

Publication Number Publication Date
WO2012159185A1 true WO2012159185A1 (en) 2012-11-29

Family

ID=46245753

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2012/000155 Ceased WO2012159185A1 (en) 2011-05-26 2012-05-24 Piston for alternative compressor

Country Status (4)

Country Link
AR (1) AR086580A1 (en)
BR (1) BRPI1102532A2 (en)
TW (1) TW201303158A (en)
WO (1) WO2012159185A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1525313A1 (en) * 1988-02-01 1989-11-30 Предприятие П/Я М-5727 Piston compressor having contact-free piston seal
DE102007034293A1 (en) * 2007-07-24 2009-01-29 BSH Bosch und Siemens Hausgeräte GmbH Lift-controlled linear compressor
WO2009054637A1 (en) * 2007-10-24 2009-04-30 Lg Electronics, Inc. Linear compressor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1525313A1 (en) * 1988-02-01 1989-11-30 Предприятие П/Я М-5727 Piston compressor having contact-free piston seal
DE102007034293A1 (en) * 2007-07-24 2009-01-29 BSH Bosch und Siemens Hausgeräte GmbH Lift-controlled linear compressor
WO2009054637A1 (en) * 2007-10-24 2009-04-30 Lg Electronics, Inc. Linear compressor

Also Published As

Publication number Publication date
AR086580A1 (en) 2014-01-08
TW201303158A (en) 2013-01-16
BRPI1102532A2 (en) 2013-07-02

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