WO2016122427A1 - Moving stop plate facility for linear compressors and increasing return gas pressure - Google Patents

Moving stop plate facility for linear compressors and increasing return gas pressure Download PDF

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Publication number
WO2016122427A1
WO2016122427A1 PCT/TR2016/050013 TR2016050013W WO2016122427A1 WO 2016122427 A1 WO2016122427 A1 WO 2016122427A1 TR 2016050013 W TR2016050013 W TR 2016050013W WO 2016122427 A1 WO2016122427 A1 WO 2016122427A1
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WO
WIPO (PCT)
Prior art keywords
piston
gas
compressor
cylinder
moving
Prior art date
Application number
PCT/TR2016/050013
Other languages
French (fr)
Inventor
Mustafa Serhan KUCUKA
Original Assignee
Dokuz Eylul Universitesi Rektorlugu
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 Dokuz Eylul Universitesi Rektorlugu filed Critical Dokuz Eylul Universitesi Rektorlugu
Priority to EP16708220.5A priority Critical patent/EP3250825B1/en
Publication of WO2016122427A1 publication Critical patent/WO2016122427A1/en

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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
    • F04B39/0005—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
    • 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
    • F04B39/0027—Pulsation and noise damping means
    • 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
    • F04B39/0016—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 with valve arranged in the piston

Definitions

  • the invention subject to the application is related to an apparatus which enables to compress the gas into the space behind the moving plate by establishing moving stop plates at the bottom and top proximity surfaces of the pistons in linear drive and free piston compressors and enables for the piston to return by means of the increased gas pressure.
  • a compressor is a mechanic unit which basically increases gas pressure by lowering its volume or increasing velocity of gas flow. Compressors are classified in accordance with the method they use for increasing gas pressure. I n linear compressors, it is aimed to minimize energy loss by means of the linear direction of the piston. Support springs are used which move together with the piston in order to ensure that the piston stops at the top dead center at the desired level and returns back in linear compressors that have started to be used extensively in refrigerators. Moreover electrical automation techniques are being used in order to control the piston motion in the control circuit. I n linear compressors piston lever and crank mill is not provided, therefore the movement of the piston together with the magnets located thereon at a linear direction and its return in the same direction is provided by means of the electricity current passed through the stator windings.
  • the suction flap When the piston is at the bottom the suction flap opens and intake is enabled and during the return of the piston, as the gas pressure in the cylinder increases, first of all the suction flap closes and following this, the delivery flap opens and the pressurized gas is supplied out via the delivery pipe.
  • the cylinder is fixed to the outer body of the compressor by means of a coupling piece.
  • the piston is coupled to the outer body of the compressor by means of support springs and these support springs enable the piston to return at the end of the compression and expansion periods. I n order for the successive compression and expansion movements to be carried on in a balanced manner, the
  • the main apparatus respectively comprises four parts as the linear engine apparatus of the compressor group, a piston apparatus and a support system apparatus.
  • the compressor comprises a stand, a compressor outer layer, a compressor cylinder, a gas discharge port and a suction port.
  • the linear engine apparatus comprises an iron bar in the interior beam , an outer yoke iron bar, a permanent magnet, an anti-collision gasket, a bobbin frame and a bobbin at the top surface thereof ; a piston, a main piston shaft and a piston head; and a supporting system line and a coupling frame and plate spring groups.
  • Spiral type plate is located at the end of the light mass end of the mounting piston head of the piston shaft which supports the spring. By means of the support plates, it is aimed to tighten the spring and increase the usable section of the compressor space; however usage of moving parts in the inner surfaces of the cylinder is not mentioned.
  • the aim of the invention is to reduce the dead space at the end of the compression period to a space that can only be occupied by the gas discharge flap, and to provide the stopping and returning of the piston by means of the gas pressure that has increased at the rear surface via the movement of the moving stop plates towards the fixed surfaces.
  • Another aim of the invention is to rule out the obligation for the operation frequency to be in compliance with the resonance frequency as a result of the elimination of the support springs that move together with the piston and to simplify the compressor structure.
  • the moving stop plates are eliminated and instead the return of the piston is enabled by means of the formation of clearance volumes that have been limited with the piston top and bottom surfaces ( Figure 3 and Figure- 4).
  • the aim of another embodiment of the invention is to establish gas compression volumes at the top and bottom proximity surfaces of the piston and to enable the gas to be trapped at the piston surfaces and for the piston to be returned at the end of the expansion periods.
  • the aim of another application of the invention is to provide a protrusion (abutment) on the piston top surface and thereby to enable the insertion of the protrusion into the gas discharge opening at the end of the compression period and therefore to prevent the gas located inside the cylinder volume from being discharged.
  • the aim of yet another application of the invention is to establish a gas compression pocket between the piston bottom surface and the compressor body in order to compress the gas at the bottom surface of the piston at the end of the expansion period.
  • the aim of another application of the invention is to enable the return of the piston from the top dead center by the effect of the gas pressure that has increased at the piston top surface at the end of the compression period.
  • the aim of another application of the invention is to enable the return of the piston from the dead center by means of the effect of gas pressure that has increased at the bottom surface of the piston at the end of the expansion period.
  • the aim of another application of the invention is to minimize the gas amount remaining inside the cylinder during the return period and to increase the compressor filling efficiency by keeping the dead volume space where the gas is compressed at the top surface of the piston, at its lowest possible level.
  • the aim of another application of the invention is to simplify the compressor structure and to eliminate the support springs that move together with the piston.
  • the aim of another application of the invention is to rule out the obligation for the operation frequency to be in compliance with the resonance frequency as a result of the elimination of the support springs.
  • Figure 2- I s the section view of the moving stop plate facility for linear compressors
  • Figure 3- I s the section view of the apparatus having gas compression cavities in linear compressors
  • An apparatus which enables to compress the gas at the rear space of the moving plate by providing moving stop plates at the piston top and bottom proximity surfaces in linear drive and free piston compressors and to enable the return of the piston by means of the increasing gas pressure, comprises;
  • Compressor outer body ( 1 ) which forms the outer surface of the compressor
  • Cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
  • Movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
  • Compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
  • Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) ,
  • Stop plate (9) with moving delivery section which enables to stop the piston (4) when the piston is in proximity to the top dead centre
  • Suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases
  • Stop plate ( 12) with moving suction section which enables to stop the piston (4) when it comes close to the bottom dead center
  • Delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
  • stop plate ( 12) with moving suction section, stop plate (9) with moving delivery section and springs (10, 13) have been positioned such that they can move between top surface of the piston(4) and internal surface of the cylinder (2) and also can move between bottom surface of the piston (4) and internal surface of the compressor body ( 1 ) in the linear compressors subject to the application .
  • the delivery flap (8) When the compressed gas volume during the upward movement of the piston (4) is decreased, the delivery flap (8) is opened and the gas at the top surface of the piston (4) passes through the pressurized gas discharge opening ( 1 8) and is transferred to the compression chamber (7) .
  • the stop plate (9) having a moving delivery section moves upward together with the piston (4) and the gas that remains behind the rear part of the stop plate (9) with moving delivery section is compressed.
  • the stop plate (9) with moving delivery section has been designed so as to prevent the leakage of gas that has remained in the rear part during its upward movement .
  • the fast return (4) of the piston and the stop plate (9) with moving delivery section is enabled.
  • the stop plate (9) with moving delivery section is coupled to the internal surface of the cylinder (2) by means of the plate springs ( 1 0) with moving delivery section , and it oscillates between the arrival and return of the piston (4) .
  • the stop plate ( 1 2) with moving suction section and the piston (4) quickly return back.
  • the stop plate ( 1 2) with moving suction section is coupled to the internal surface of the outer body of the compressor ( 1 ) via plate springs ( 13) with moving suction section and it oscillates in a specific way between the arrival and the return of the piston (4) .
  • a suction pipe (16) which transfers the gas into the cylinder is located at the bottom section of the compressor and a delivery pipe (20) which discharges the gas that has accumulated inside the compression chamber (7) out of the compressor, is located at the top section of the compressor.
  • the dead space that is created at the end of the compression period is reduced to a space that can be occupied only by the gas discharge flap (8) by providing the stopping and return movements of the piston (4) via the stop plate (9) with moving delivery section and the stop plate ( 12) with moving suction section.
  • the piston support springs ( 17) used in the state of the art occupied a large space at the outer body ( 1 ) of the compressor and the operation speed of the compressor was dependent on the natural frequency of the system formed of piston support springs ( 17) and the piston (4) .
  • the movement of the piston (4) is no longer dependent on the moving springs ( 17) and the stopping and return actions of the piston (4) is enabled by means of the stop plate (9) with moving delivery section and the stop plate ( 12) with moving suction section.
  • the invention is an apparatus which enables the piston to return by means of increased gas pressure and enables to trap the gas at the top and bottom surfaces of the piston without using the stop plates at the piston bottom and top proximity surfaces in linear drive and free piston compressors, which comprises the following components;
  • a compressor outer body ( 1 ) which forms the outer surface of the compressor A cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
  • a cylinder coupling part (3) which fixes the cylinder (2) to the compressor body ( 1 )
  • a piston (4) which moves up and down in order to provide the change in gas volume
  • a stator (5) over which electricity current passes
  • a movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
  • a compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
  • Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) ,
  • a suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases
  • Gas compression housing ( 14) in which the gas remaining in the rear is trapped when the piston (4) moves to the bottom dead center
  • a suction pipe (16) which transfers the gas into the compressor, and which is located at the bottom section of the compressor
  • a piston protrusion ( 19) which moves together with the piston (4) and enters the gas discharge opening ( 18) at the end of the compression period and prevents the gas remaining inside the cylinder (2) space from being transferred to the gas compression chamber.
  • a delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
  • the delivery flap (8) opens and the gas inside the cylinder is transferred to the discharge chamber (7) .
  • the piston protrusion (19) enters the pressurized gas discharge opening ( 18) and the gas remaining inside the cylinder (2) space is prevented from being transferred into the gas discharge chamber and therefore the gas pressure is increased further.
  • the rapid return of the piston (4) is enabled by means of the gas pressure effect following the shutting off of the electric drive force.
  • the piston (4) bottom surface enters the gas compression housing ( 14) which has been surrounded by the peripheral plate ( 15) of the gas compression housing and compresses the gas remaining herein.
  • the increased gas pressure slows down and stops the motion of the piston (4) .
  • the piston rapidly returns back following the shutting off of the electric drive force.
  • the gas is transferred into the compressor by means of the suction pipe (16) located at the bottom section.
  • the suction flap ( 1 1 ) opens when the gas pressure inside the cylinder (2) is reduced during the downward movement of the piston (4) and the gas is enabled to be transferred into the cylinder (2) space.
  • a delivery pipe (20) which enables the gas located inside the gas compression chamber (7) to be discharged out of the compressor is provided at the top section of the compressor.
  • the stopping of the piston (4) at the top section can be determined more precisely, and therefore the dead volume space inside the cylinder (2) can be kept at a low level.

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

Abstract

The invention subject to the application is related to an apparatus which enables to compress the gas into the space behind the moving plate by establishing moving stop plates (9, 12) at the bottom and top proximity surfaces of the pistons in linear drive and free piston compressors and enables for the piston to return by means of the increased gas pressure and by means of a spring force.

Description

MOVI NG STOP PLATE FACI LI TY FOR LI NEAR COMPRESSORS AND I NCREASI NG
RETURN GAS PRESSURE
DESCRI PTI ON Technical Field of the I nvention
The invention subject to the application is related to an apparatus which enables to compress the gas into the space behind the moving plate by establishing moving stop plates at the bottom and top proximity surfaces of the pistons in linear drive and free piston compressors and enables for the piston to return by means of the increased gas pressure. Known State of the Art ( Prior Art)
A compressor is a mechanic unit which basically increases gas pressure by lowering its volume or increasing velocity of gas flow. Compressors are classified in accordance with the method they use for increasing gas pressure. I n linear compressors, it is aimed to minimize energy loss by means of the linear direction of the piston. Support springs are used which move together with the piston in order to ensure that the piston stops at the top dead center at the desired level and returns back in linear compressors that have started to be used extensively in refrigerators. Moreover electrical automation techniques are being used in order to control the piston motion in the control circuit. I n linear compressors piston lever and crank mill is not provided, therefore the movement of the piston together with the magnets located thereon at a linear direction and its return in the same direction is provided by means of the electricity current passed through the stator windings. When the piston is at the bottom the suction flap opens and intake is enabled and during the return of the piston, as the gas pressure in the cylinder increases, first of all the suction flap closes and following this, the delivery flap opens and the pressurized gas is supplied out via the delivery pipe. The cylinder is fixed to the outer body of the compressor by means of a coupling piece. I n the known state of the art, the piston is coupled to the outer body of the compressor by means of support springs and these support springs enable the piston to return at the end of the compression and expansion periods. I n order for the successive compression and expansion movements to be carried on in a balanced manner, the
l piston operation speed needs to be in compliance with the natural frequency of the system ( Figure 1 ) .
These state of the art compressors, have disadvantages such as the springs used, occupy a large space, and are expensive, the system needs to be operated in resonance frequencies, and the dead volume space cannot be limited. The operation speed of the compressor is dependent on the natural frequency of the system formed of support springs and a piston. Besides this, as the stopping point of the piston may vary according to operation conditions, at the end of the compression period, a dead volume space is formed between the top surface of the piston and the inner surface of the cylinder, and this situation causes a decrease in the filling efficiency during the succeeding period.
It is mentioned that in the known state of the art patent document numbered US 8714946 B2 that an electromagnetic spring system is developed as the support springs in a linear compressor were not adequate to store energy which enables the piston to stop and return back. I n the CN101892971 numbered patent document of the known state of the art, a linear compression having a plate shaped spring support is described as the invention. The main apparatus respectively comprises four parts as the linear engine apparatus of the compressor group, a piston apparatus and a support system apparatus. The compressor comprises a stand, a compressor outer layer, a compressor cylinder, a gas discharge port and a suction port. The linear engine apparatus comprises an iron bar in the interior beam , an outer yoke iron bar, a permanent magnet, an anti-collision gasket, a bobbin frame and a bobbin at the top surface thereof ; a piston, a main piston shaft and a piston head; and a supporting system line and a coupling frame and plate spring groups. Spiral type plate is located at the end of the light mass end of the mounting piston head of the piston shaft which supports the spring. By means of the support plates, it is aimed to tighten the spring and increase the usable section of the compressor space; however usage of moving parts in the inner surfaces of the cylinder is not mentioned.
An arrangement directed to the return of the piston by increasing the gas pressure at the end of the compression period in the known state of the art has been proposed with the patent document numbered US 6,644,945. I n this arrangement an apparatus which is coupled to the top surface of the piston closes the outlet (delivery) flap at the end of the compression period, and the gas pressure left inside the cylinder is prevented from increasing and colliding with the inner surface of the piston cylinder. This arrangement necessitates the usage of elastic or spring means in order to confine the gas at the end of the compression period on the top surface of the piston, and it does not comprise a mechanism at the end of the expansion period in order to provide pressure increase at the bottom surface of the piston.
Brief Description of the I nvention and its Aims
The piston support springs provided in the state of the art have been eliminated in the moving stop plate facility for linear compressors subject to the invention and instead of said springs, moving plates and plate coupling springs have been used. Following the elimination of the support springs, the movement of the piston is no longer dependent on the springs and the stopping and return movements of the piston are provided by means of the moving stop plates ( Figure 2) .
The aim of the invention is to reduce the dead space at the end of the compression period to a space that can only be occupied by the gas discharge flap, and to provide the stopping and returning of the piston by means of the gas pressure that has increased at the rear surface via the movement of the moving stop plates towards the fixed surfaces.
Another aim of the invention is to rule out the obligation for the operation frequency to be in compliance with the resonance frequency as a result of the elimination of the support springs that move together with the piston and to simplify the compressor structure.
According to another application of the invention the moving stop plates are eliminated and instead the return of the piston is enabled by means of the formation of clearance volumes that have been limited with the piston top and bottom surfaces (Figure 3 and Figure- 4).
The aim of another embodiment of the invention is to establish gas compression volumes at the top and bottom proximity surfaces of the piston and to enable the gas to be trapped at the piston surfaces and for the piston to be returned at the end of the expansion periods.
The aim of another application of the invention is to provide a protrusion (abutment) on the piston top surface and thereby to enable the insertion of the protrusion into the gas discharge opening at the end of the compression period and therefore to prevent the gas located inside the cylinder volume from being discharged. The aim of yet another application of the invention is to establish a gas compression pocket between the piston bottom surface and the compressor body in order to compress the gas at the bottom surface of the piston at the end of the expansion period.
The aim of another application of the invention is to enable the return of the piston from the top dead center by the effect of the gas pressure that has increased at the piston top surface at the end of the compression period.
The aim of another application of the invention is to enable the return of the piston from the dead center by means of the effect of gas pressure that has increased at the bottom surface of the piston at the end of the expansion period. The aim of another application of the invention is to minimize the gas amount remaining inside the cylinder during the return period and to increase the compressor filling efficiency by keeping the dead volume space where the gas is compressed at the top surface of the piston, at its lowest possible level.
The aim of another application of the invention is to simplify the compressor structure and to eliminate the support springs that move together with the piston.
The aim of another application of the invention is to rule out the obligation for the operation frequency to be in compliance with the resonance frequency as a result of the elimination of the support springs.
Definition of the Figures Describing the I nvention The figures that have been prepared in order to further explain the moving stop plate facility for linear compressors and the increasing of the return gas pressure for linear compressors that have been developed according to the invention have been described below.
Figure 1 - I s the section view of the linear compressor ( Prior Art)
Figure 2- I s the section view of the moving stop plate facility for linear compressors Figure 3- I s the section view of the apparatus having gas compression cavities in linear compressors
Figure 4- I s the detailed view of the pressurized gas discharge opening Definitions of the Aspects of the I nvention
The parts shown in the figures that have been drawn in order to further describe the increase of the return gas pressure and the moving stop plate facility for linear compressors that have been developed by means of the invention have each been numbered and the reference of each number has been listed below.
1 . Compressor outer body
2. Cylinder
3. Cylinder coupling part
4. Piston
5. Stator
6. Movable magnet
7. Compression chamber
8. Delivery (gas discharge) flap
9. Stop plate with moving delivery section
10. Plate springs with moving delivery section
1 1 . Suction flap
12. Stop plate with moving suction section
13. Plate springs with moving suction section
14. Gas compression housing of suction section
15. Peripheral plate of gas compression housing
16. Suction pipe
17. Piston support springs
18. Pressurized gas discharge opening
19. Piston protrusion
20. Delivery pipe
Detailed Description of the I nvention
An apparatus which enables to compress the gas at the rear space of the moving plate by providing moving stop plates at the piston top and bottom proximity surfaces in linear drive and free piston compressors and to enable the return of the piston by means of the increasing gas pressure, comprises;
• Compressor outer body ( 1 ) which forms the outer surface of the compressor, • Cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
• Cylinder coupling part (3) which fixes the cylinder (2) to the compressor body ( 1 ) ,
• Piston (4) which moves up and down in order to provide the change in gas volume,
• Stator (5) over which electricity current passes,
• Movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
• Compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
• Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) ,
• Stop plate (9) with moving delivery section which enables to stop the piston (4) when the piston is in proximity to the top dead centre,
• Plate springs (10) that hold stop plate (9) such that it can move between the piston(4) and the internal surfaces of the cylinder (2) ,
• Suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases,
• Stop plate ( 12) with moving suction section which enables to stop the piston (4) when it comes close to the bottom dead center,
• Plate springs ( 13) that hold stop plate (1 2) such that it can move between the bottom side of the piston(4) and the outer body of the compressor ( 1 ) ,
• Gas compression housing ( 14) in which the gas remaining in the rear surface of the stop plate (12) having a moving section section is trapped when the piston (4) moves to the bottom dead center,
• Peripheral plate (15) which surrounds the gas compression housing (14) of suction section,
• Suction pipe (16) which transfers the gas into the compressor, and which is located at the bottom section of the compressor
• Pressurized gas discharge opening ( 18) from which the entrapped gas is discharged from the cylinder (2) ,
• Delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
The stop plate ( 12) with moving suction section, stop plate (9) with moving delivery section and springs (10, 13) have been positioned such that they can move between top surface of the piston(4) and internal surface of the cylinder (2) and also can move between bottom surface of the piston (4) and internal surface of the compressor body ( 1 ) in the linear compressors subject to the application .
I n linear compressors, a piston arm and the main shaft (crank shaft) is not present, therefore the movement of the piston (4) together with the movable magnets (6) thereon at a linear direction and its return in the same direction is enabled by means of the electric current that is passed through the stator (5) windings.
When the compressed gas volume during the upward movement of the piston (4) is decreased, the delivery flap (8) is opened and the gas at the top surface of the piston (4) passes through the pressurized gas discharge opening ( 1 8) and is transferred to the compression chamber (7) .
As the piston (4) gets closer to the top dead center, the stop plate (9) having a moving delivery section moves upward together with the piston (4) and the gas that remains behind the rear part of the stop plate (9) with moving delivery section is compressed. The stop plate (9) with moving delivery section has been designed so as to prevent the leakage of gas that has remained in the rear part during its upward movement .
By means of the effect of the gas pressure at the rear surface and the cutting off of the electric driving force, the fast return (4) of the piston and the stop plate (9) with moving delivery section is enabled. The stop plate (9) with moving delivery section is coupled to the internal surface of the cylinder (2) by means of the plate springs ( 1 0) with moving delivery section , and it oscillates between the arrival and return of the piston (4) .
When the piston (4) comes closer to the bottom dead center during its downward movement , the piston (4) pushes the plate ( 1 2) with moving suction section into the gas compression chamber ( 1 4) that has been surrounded by the peripheral plate ( 1 5) . The gas pressure that has increased inside the gas compression chamber ( 14) slows down and then stops the movement of the piston (4) .
When the electric driver force is cut off , the stop plate ( 1 2) with moving suction section and the piston (4) quickly return back. The stop plate ( 1 2) with moving suction section is coupled to the internal surface of the outer body of the compressor ( 1 ) via plate springs ( 13) with moving suction section and it oscillates in a specific way between the arrival and the return of the piston (4) .
A suction pipe (16) which transfers the gas into the cylinder is located at the bottom section of the compressor and a delivery pipe (20) which discharges the gas that has accumulated inside the compression chamber (7) out of the compressor, is located at the top section of the compressor.
The dead space that is created at the end of the compression period is reduced to a space that can be occupied only by the gas discharge flap (8) by providing the stopping and return movements of the piston (4) via the stop plate (9) with moving delivery section and the stop plate ( 12) with moving suction section.
The piston support springs ( 17) used in the state of the art occupied a large space at the outer body ( 1 ) of the compressor and the operation speed of the compressor was dependent on the natural frequency of the system formed of piston support springs ( 17) and the piston (4) . According to the present invention, the movement of the piston (4) is no longer dependent on the moving springs ( 17) and the stopping and return actions of the piston (4) is enabled by means of the stop plate (9) with moving delivery section and the stop plate ( 12) with moving suction section.
When the stop plate (9) with moving delivery section and the stop plate (12) with moving suction section move toward the fixed surfaces, the gas pressure that has increased in the rear surface enables the piston (4) to stop and to return.
The piston balancing and support springs (17) which regulate the back and forth movement of the piston (4) are no longer needed as the piston (4) reaches the desired return speed by means of the gas pressure effect. I n this manner the configuration of the compressor is simplified and the obligation for the operation frequency to be in compliance with the resonance frequency is eliminated.
According to another application the invention is an apparatus which enables the piston to return by means of increased gas pressure and enables to trap the gas at the top and bottom surfaces of the piston without using the stop plates at the piston bottom and top proximity surfaces in linear drive and free piston compressors, which comprises the following components;
• A compressor outer body ( 1 ) which forms the outer surface of the compressor, A cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
A cylinder coupling part (3) which fixes the cylinder (2) to the compressor body ( 1 ) , A piston (4) which moves up and down in order to provide the change in gas volume, A stator (5) over which electricity current passes,
A movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
A compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) ,
A suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases,
Gas compression housing ( 14) in which the gas remaining in the rear is trapped when the piston (4) moves to the bottom dead center,
A peripheral plate (1 5) which surrounds the gas compression housing ( 14) of suction section,
A suction pipe (16) which transfers the gas into the compressor, and which is located at the bottom section of the compressor
Pressurized gas discharge opening (18) by which the entrapped gas is discharged from the cylinder (2) ,
A piston protrusion ( 19) which moves together with the piston (4) and enters the gas discharge opening ( 18) at the end of the compression period and prevents the gas remaining inside the cylinder (2) space from being transferred to the gas compression chamber.
A delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
I n linear compressors a piston lever and main shaft (crank shaft) is not provided, therefore the linear movement of the movable magnets (6) and depending on this, the movement of the piston (4) inside the cylinder (2) is enabled by means of the electric current passed through the stator (5) windings. The moving piston (4) has been positioned such that it can move in reciprocation between the fixed surfaces of the cylinder (2) and the compressor body (1 ) . A cylinder coupling part (3) is provided in order to fix the cylinder (2) to the compressor's outer body (1 ) . The piston protrusion (19) in the apparatus for increasing the return gas pressure in linear compressors has been positioned such that it can enter the pressurized gas discharge opening (18) with a low clearance tolerance. When the compressed gas pressure during the upward movement of the piston (4) increases, the delivery flap (8) opens and the gas inside the cylinder is transferred to the discharge chamber (7) . When the piston (4) moves to the top dead center, the piston protrusion (19) enters the pressurized gas discharge opening ( 18) and the gas remaining inside the cylinder (2) space is prevented from being transferred into the gas discharge chamber and therefore the gas pressure is increased further. The rapid return of the piston (4) is enabled by means of the gas pressure effect following the shutting off of the electric drive force.
During the up and down movement of the piston (4) , the piston (4) bottom surface enters the gas compression housing ( 14) which has been surrounded by the peripheral plate ( 15) of the gas compression housing and compresses the gas remaining herein. The increased gas pressure slows down and stops the motion of the piston (4) . The piston rapidly returns back following the shutting off of the electric drive force.
The gas is transferred into the compressor by means of the suction pipe (16) located at the bottom section. The suction flap ( 1 1 ) opens when the gas pressure inside the cylinder (2) is reduced during the downward movement of the piston (4) and the gas is enabled to be transferred into the cylinder (2) space. A delivery pipe (20) which enables the gas located inside the gas compression chamber (7) to be discharged out of the compressor is provided at the top section of the compressor.
As the stopping and returning actions of the piston (4) at the top and bottom dead centers, is provided respectively by means of the increased gas pressures within the space of the top section of the cylinder (2) and the gas compression housing (14) , the balancing and support springs which regulate the back and forth movement of the piston (4) is no longer needed. I n this manner the configuration of the compressor is simplified and the obligation for the operation frequency to be in compliance with the resonance frequency is eliminated.
As the springs are no longer present, the stopping of the piston (4) at the top section can be determined more precisely, and therefore the dead volume space inside the cylinder (2) can be kept at a low level.

Claims

CLAI MS
An apparatus which enables to compress the gas at the rear space of the moving plate by providing moving stop plates at the piston top and bottom proximity surfaces in linear drive and free piston compressors and to enable the return of the piston by means of the increasing gas pressure, characterized in that it comprises;
A compressor outer body ( 1 ) which forms the outer surface of the compressor,
A cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
A cylinder coupling part (3) which fixes the cylinder (2) to the compressor body ( 1 ) , A piston (4) which moves up and down in order to provide the change in gas volume, A stator (5) over which electricity current passes,
A movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
A compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) ,
Stop plate (9) with moving delivery section which enables to stop the piston (4) when the piston is in proximity to the top dead centre,
Plate springs (10) that hold stop plate (9) such that it can move between the piston(4) and the internal surfaces of the cylinder (2) ,
A suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases,
Stop plate ( 12) with moving suction section which enables to stop the piston (4) when it comes close to the bottom dead center,
Plate springs ( 13) that hold stop plate (1 2) such that it can move between the bottom side of the piston(4) and the outer body of the compressor ( 1 ) ,
Gas compression housing ( 14) in which the gas remaining in the rear surface of the stop plate ( 12) having a moving section is trapped when the piston (4) moves to the bottom dead center,
A peripheral plate (1 5) which surrounds the gas compression housing ( 14) of suction section, • A suction pipe (16) which transfers the gas into the compressor, and which is located at the bottom section of the compressor
• Pressurized gas discharge opening ( 18) from which the entrapped gas is discharged from the cylinder (2) ,
• A delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
2. A moving stop plate facility for linear compressors according to claim 1 , characterized in that, as the piston (4) gets closer to the top dead center, the stop plate (9) with moving delivery section moves upward together with the piston (4) and the gas remaining at the rear section of the top plate (9) with moving delivery section is compressed.
3. A moving stop plate facility for linear compressors according to claim 1 , characterized in that, as the piston (4) gets closer to the top dead center with its downward movement, the gas pressure at the rear surface of the plate (12) with moving suction section is increased and as a result the plate ( 12) with moving suction section is pushed and is inserted into the gas compression housing (14) .
4. An apparatus which enables the piston to return by means of increased gas pressure and enables to trap the gas at the top and bottom surfaces of the piston without using the stop plates at the piston bottom and top proximity surfaces in linear drive and free piston compressors, characterized in that it comprises;
• A compressor outer body ( 1 ) which forms the outer surface of the compressor,
• A cylinder (2) fixed to the outer body ( 1 ) of the compressor wherein pressure difference is established by piston movements (4) ,
• A cylinder coupling part (3) which fixes the cylinder (2) to the compressor body ( 1 ) ,
• A piston (4) which moves up and down in order to provide the change in gas volume,
• A stator (5) over which electricity current passes,
• A movable magnet (6) located on the piston (4) , which moves in a linear direction together with the piston (4) ,
• A compression chamber (7) located on the top surface of the piston (4) onto which compressed gas is transferred by means of the piston (4) ,
• Delivery (gas discharge) flap (8) which opens by means of the reduction of the compressed gas volume via the up and down movement of the piston (4) , • A suction flap ( 1 1 ) which opens when the piston (4) is at the lower point and closes when the gas pressure inside the cylinder (2) increases,
• Gas compression housing ( 14) in which the gas remaining in the rear is trapped when the piston (4) moves to the bottom dead center,
• A peripheral plate (1 5) which surrounds the gas compression housing ( 14) of suction section,
• A suction pipe (16) which transfers the gas into the compressor, and which is located at the bottom section of the compressor
• Pressurized gas discharge opening (18) by which the entrapped gas is discharged from the cylinder (2) ,
• A piston protrusion ( 19) which moves together with the piston (4) and enters the gas discharge opening ( 18) at the end of the compression period and prevents the gas remaining inside the cylinder (2) space from being transferred to the gas compression chamber.
• A delivery pipe (20) which discharges the gas located inside the compression chamber (7) out of the compressor, located at the top section of the compressor.
5. An apparatus for increasing the return gas pressure in linear compressors according to claim 4, characterized in that when the compressed gas volume is reduced during the upward movement of the piston (4) the delivery flap (8) is opened and the gas on the top surface of the piston (4) is transferred to the delivery gas discharge chamber (7) .
6. An apparatus for increasing the return gas pressure in linear compressors according to claim 4, characterized in that; when the compressed gas volume is reduced during the upward movement of the piston (4) , the piston protrusion (19) also moves upward and the gas discharge opening ( 18) closes and the gas inside the cylinder (2) is compressed and its pressure is increased.
7. An apparatus for increasing the return gas pressure in linear compressors according to claim 4, characterized in that; when the piston (4) gets closer to the dead center, the piston enters into the gas compression housing ( 14) that has been established on the bottom surface of the piston compressor body (1 ) and the gas pressure inside the housing is compressed and its pressure is increased.
PCT/TR2016/050013 2015-01-27 2016-01-20 Moving stop plate facility for linear compressors and increasing return gas pressure WO2016122427A1 (en)

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TR2015/00882 2015-01-27
TR201500882 2015-01-27
TR2015/09308 2015-07-28
TR201509308 2015-07-28

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Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355108A (en) * 1992-10-05 1994-10-11 Aura Systems, Inc. Electromagnetically actuated compressor valve
EP0819333A1 (en) * 1995-04-03 1998-01-21 Wei-Min Zhang Linear motor compressor and its application in cooling system
US6644945B2 (en) 1999-05-17 2003-11-11 Empresa Brasileira De Compressores S.A. -Embraco Valve arrangement for limiting piston stroke collisions in a reciprocating compressor with a linear motor
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