EP1420162A2 - Control valve for variable displacement compressor - Google Patents
Control valve for variable displacement compressor Download PDFInfo
- Publication number
- EP1420162A2 EP1420162A2 EP03025917A EP03025917A EP1420162A2 EP 1420162 A2 EP1420162 A2 EP 1420162A2 EP 03025917 A EP03025917 A EP 03025917A EP 03025917 A EP03025917 A EP 03025917A EP 1420162 A2 EP1420162 A2 EP 1420162A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- control valve
- relatively high
- passage
- crank chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
-
- 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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
-
- 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
- F04B39/16—Filtration; Moisture separation
-
- 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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/1809—Controlled pressure
- F04B2027/1813—Crankcase pressure
-
- 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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/1822—Valve-controlled fluid connection
- F04B2027/1827—Valve-controlled fluid connection between crankcase and discharge chamber
-
- 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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/184—Valve controlling parameter
- F04B2027/185—Discharge pressure
-
- 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
- F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
- F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
- F04B27/14—Control
- F04B27/16—Control of pumps with stationary cylinders
- F04B27/18—Control of pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
- F04B27/1804—Controlled by crankcase pressure
- F04B2027/1886—Open (not controlling) fluid passage
- F04B2027/1895—Open (not controlling) fluid passage between crankcase and suction chamber
-
- 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
- F04B2205/00—Fluid parameters
- F04B2205/05—Pressure after the pump outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0403—Refractory metals, e.g. V, W
- F05C2201/0406—Chromium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0466—Nickel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0469—Other heavy metals
- F05C2201/0475—Copper or alloys thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Definitions
- the present invention relates to a control valve for controlling the displacement of a variable displacement compressor in a refrigeration cycle.
- a variable displacement swash plate type compressor for use in a refrigeration cycle optionally varies the inclination angle of a swash plate or the displacement of the compressor by adjusting pressure in a crank chamber or a chamber for accommodating the swash plate, as disclosed in page 15 to 16 and FIG. 12 of Unexamined Japanese Patent Publication No. 2001-173556.
- the compressor provides a control valve for adjusting the pressure in the crank chamber.
- the control valve for example, varies the opening degree of a supply passage that interconnects a relatively high pressure region of the refrigeration cycle and the crank chamber.
- a relatively low pressure region of the refrigeration cycle and the crank chamber are interconnected through a bleed passage.
- the opening degree of the control valve is adjusted to control a balance between the amount of relatively high pressure refrigerant gas introduced from the relatively high pressure region to the crank chamber through the supply passage and the amount of refrigerant gas delivered from the crank chamber to the relatively low pressure region through the bleed passage.
- the pressure in the crank chamber is determined.
- the inclination angle of the swash plate is varied in accordance with the variation of the pressure in the crank chamber. As a result, the stroke of pistons, that is, the displacement of the compressor, is adjusted.
- a seat surface of a valve seat and a valve surface of a valve body for opening and closing the control valve constitute a portion for adjusting the opening degree of the control valve.
- a variable displacement compressor optionally varies displacement based upon pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle.
- a control valve of the variable displacement compressor has a valve seat and a valve.
- the valve seat has a seat surface for adjusting the opening degree of the passage.
- the valve has a valve surface for adjusting the opening degree of the passage. At least one of the seat surface and the valve surface is made of a material with relatively high hardness.
- FIGs. 1 A and 1 B A preferred embodiment of the present invention will now be described with reference to FIGs. 1 A and 1 B.
- FIG. 1 A illustrates a schematic view of a variable displacement swash plate type compressor 1 (hereinafter the compressor 1) for a refrigeration cycle of a vehicle air conditioner.
- the compressor 1 introduces refrigerant gas from a suction chamber 2 into a compression chamber 1 a, then compresses the introduced refrigerant gas and discharges the compressed refrigerant gas to a discharge chamber 3 as the volume of the compression chamber 1 a is varied by the rotation of a swash plate (not shown).
- An oil separator 4 is arranged near an outlet of the discharge chamber 3 for separating misty lubricating oil contained in the refrigerant gas from the refrigerant gas.
- carbon dioxide is employed as refrigerant for the refrigeration cycle.
- a crank chamber 5 which accommodates the swash plate, communicates with the suction chamber 2, which is a relatively low pressure region in the refrigeration cycle, through a bleed passage 6.
- the oil separator 4 which is a relatively high pressure region in the refrigeration cycle, communicates with the crank chamber 5 through a supply passage 7.
- the supply passage 7 doubles as a feeding passage for feeding the lubricating oil separated by the oil separator 4 to the crank chamber 5.
- a filter 8 is arranged at the upstream side (the side of the oil separator 4) of the supply passage 7 for removing foreign particles in the refrigerant gas.
- the filter 8 has a mesh size for only removing the foreign particles of 20 to 30 ⁇ m or above in view of interference against the flow of refrigerant gas.
- a control valve CV is arranged in the supply passage 7 and optionally adjusts the opening degree of the supply passage 7.
- the adjustment of the opening degree of the control valve CV controls a balance between the amount of relatively high pressure refrigerant gas introduced from the discharge chamber 3 into the crank chamber 5 through the supply passage 7 and the amount of refrigerant gas delivered from the crank chamber 5 to the suction chamber 2 through the bleed passage 6.
- the pressure in the crank chamber 5 is determined.
- the inclination angle of the swash plate is varied in accordance with the variation of the pressure in the crank chamber 5 so that the displacement of the compressor 1 is adjusted.
- the inclination angle of the swash plate increases so that the displacement of the compressor 1 increases.
- the inclination angle of the swash plate reduces so that the displacement of the compressor 1 reduces.
- a valve housing 10 of the control valve CV includes a valve body 11 on the upper side and an actuator housing 12 on the lower side in the drawing.
- a valve chamber 22 Starting from the lower side of the drawing, a valve chamber 22, a communication passage 23 and a pressure sensing chamber 24 are respectively defined in the valve body 11.
- a valve rod 25 is movably arranged through the valve chamber 22 and the communication passage 23 so as to extend in the axial direction of the valve housing 10 (the vertical direction of the drawing). The upper end of the valve rod 25 inserted through the communication passage 23 separates the communication passage 23 from the pressure sensing chamber 24.
- the communication passage 23 communicates with the oil separator 4 of the compressor 1 through the upstream portion of the supply passage 7.
- the valve chamber 22 communicates with the crank chamber 5 of the compressor 1 through the downstream portion of the supply passage 7.
- the valve chamber 22 and the communication passage 23 constitute a portion of the supply passage 7.
- a valve portion 31 formed at the middle portion of the valve rod 25 is arranged in the valve chamber 22.
- a step between the valve chamber 22 and the communication passage 23 forms a valve seat 32, and accordingly the communication passage 23 forms a valve hole.
- a coil spring 60 for urging the valve rod 25 is arranged in the valve chamber 22. The coil spring 60 urges the valve rod 25 in a direction in which the valve portion 31 leaves away from the valve chamber 32.
- a bellows 33 which has a cylindrical shape, is accommodated in the pressure sensing chamber 24.
- the upper end of the bellows 33 is fixed to the valve housing 10.
- the upper end of the valve rod 25 is fitted to the lower end of the bellows 33.
- the bellows 33 has a bottom at one end and partitions the pressure sensing chamber 24 into a first pressure chamber 49 and a second pressure chamber 50.
- a fixed throttle 41 is provided in a discharge passage 40, which interconnects the discharge chamber 3 with an external refrigerant circuit (not shown).
- the first pressure chamber 49 communicates with the discharge passage 40 through a first pressure introducing passage 42 and connects at the upstream side (the side of the discharge chamber 3) relative to the fixed throttle 41.
- the second pressure chamber 50 communicates with the discharge passage 40 through a second pressure introducing passage 43 and connects at the downstream side relative to the fixed throttle 41.
- the bellows 33 reflects the variation of pressure difference between the upstream side and downstream side of the fixed throttle 41 for positioning of the valve rod 25 (the valve portion 31) as the lower end portion of the bellows 33 moves in accordance with the pressure difference.
- the bellows 33 moves the valve portion 31 in such a manner that the displacement of the compressor 1 varies to cancel the variation of the pressure difference between the upstream side and downstream side of the fixed throttle 41.
- An electromagnetic actuator 51 is provided at the lower side of the valve housing 10.
- the electromagnetic actuator 51 provides a cylindrical accommodating cylinder 52 with a bottom at one end in the middle of the actuator housing 12.
- a center post 53 which has a columnar shape, is fixedly fitted to the opening of the accommodating cylinder 52 on the upper side. This fitting of the center post 53 defines a plunger chamber 54 at the lowest portion of the accommodating cylinder 52.
- a plunger 56 is accommodated in the plunger chamber 54 and is movable in the axial direction (the vertical direction of the FIG. 1A).
- a guide hole 57 extends through the center of the center post 53 in the axial direction of the center post 53.
- the lower side of the valve rod 25 is movably arranged in the guide hole 57.
- the lower end of the valve rod 25 is fixedly fitted to the plunger 56 in the plunger chamber 54. Accordingly, the plunger 56 and the valve rod 25 integrally move up and down anytime.
- a coil 61 winds around the outer circumference of the accommodating cylinder 52 and partially covers an area from the center post 53 to the plunger 56.
- the coil 61 is supplied with electric power based upon a command of an air conditioner ECU (not shown). Accordingly, the magnitude of electromagnetic force (electromagnetic attraction) corresponding to electric power supplied to the coil 61 is generated between the plunger 56 and the center post 53. The electromagnetic force is transmitted to the valve rod 25 (the valve portion 31) through the plunger 56.
- the electromagnetic actuator 51 varies electromagnetic force applied to the valve portion 31 in accordance with the electric power externally supplied so that a control target for pressure difference between the upstream side and downstream side of the fixed throttle 41 (set pressure differential), which is a reference for positioning action of the valve portion 31 by the bellows 33, is optionally changed.
- set pressure differential which is a reference for positioning action of the valve portion 31 by the bellows 33.
- the control valve CV internally and autonomously positions the valve rod 25 (the valve portion 31) in accordance with the variation of the pressure difference so as to maintain the set pressure difference determined by electric power supplied to the coil 61.
- this set pressure difference is externally varied by adjusting electric power supplied to the coil 61.
- the refrigerant gas may flow through the supply passage 7 at relatively high speed.
- the seat surface 32a of the valve seat 32 and the valve surface 31 a of the valve portion 31, which are portions for adjusting the opening degree of the control valve CV, both are made of materials with relatively high hardness for protection against erosion.
- the word of "a material with relatively high hardness" in the preferred embodiment means that a material with Vickers hardness of 500 or above because pressure difference between relatively high and low pressures in the refrigeration cycle occasionally becomes approximately 10MPa and particles, which cause erosion are constituted of fine solid particles (10 to 20 ⁇ m) such as silicon oxide with relatively high hardness.
- the material of the valve seat 32 is brass and has Vickers hardness of approximately 200. Accordingly, to obtain a material of the seat surface 32a of the valve seat 32 with relatively high hardness, the surface of the material of the valve seat 32 is coated with a high hardness layer 32b by nickel-phosphorus plating. Thus, the seat surface 32a of the valve seat 32 is constituted of a relatively high hardness material with Vickers hardness of 500 to 800.
- the material of the valve rod 25 (the valve portion 31) is stainless steel (SUS) and has Vickers hardness of approximately 300. Accordingly, to obtain a material of the valve surface 31a of the valve portion 31 with relatively high hardness, the surface of the material of the valve portion 31 is coated with a high hardness layer 31b by salt-bath nitriding. Thus, the valve surface 31a of the valve portion 31 is constituted of a relatively high hardness material with Vickers hardness of 900 to 1100.
- the thicknesses of the above high hardness layers 31b, 32b range approximately from a few ⁇ m to 1 mm.
- the thicknesses of the high hardness layers 31b, 32b in FIG. 1B are exaggerated for easier understanding.
- the coil spring 60 is not shown in FIG. 1B.
- either of the seat surface 32a of the valve seat 32 or the valve surface 31a of the valve portion 31 is made of a material with relatively high hardness.
- the same advantageous effect to that of the paragraph (1) is obtained. That is, the leakage of the refrigerant gas is reduced in a state when the control valve CV is fully closed.
- both of the seat surface 32a of the valve seat 32 and the valve surface 31a of the valve portion 31, which are respectively made of materials with relatively high hardness more reliably perform the above advantageous effect.
- the seat surface 32a of the valve seat 32 is constituted of a material with relatively high hardness in such a manner that the material of the valve seat 32 is treated with surface hardening by nickel-phosphorus plating.
- the surface hardening of the material of the valve seat 32 is selected from the group consisting of nickel plating, nickel-phosphorus-boron plating, nickel-boron plating, nickel-boron-tungsten plating, chrome plating and copper plating.
- the seat surface 32a is constituted of a material with relatively high hardness.
- the seat surface 32a of the valve seat 32 is not limited to be hardened with the surface hardening by plating but may be hardened by one of ion nitriding, gas nitrocarburizing and salt-bath nitriding.
- the valve surface 31 a is constituted of a material with relatively high hardness.
- valve surface 31a of the valve portion 31 is not limited to be hardened with the surface hardening by nitriding.
- the valve surface 31a of the valve portion 31 may be hardened with the surface hardening of a material of the valve portion 31 by one of nickel plating, nickel-phosphorus plating, nickel-phosphorus-boron plating, nickel-boron plating, nickel-boron-tungsten plating, chrome plating and copper plating.
- the material of the valve portion 31 (the valve rod 25) is steel for carburizing, and the surface of the material is hardened by carburizing so as to form the valve surface 31a with relatively high hardness.
- the material of the valve seat 32 is not limited to brass but may be another copper series material, aluminum series material or stainless steel (SUS).
- the control valve CV varies the opening degree of the supply passage 7 that interconnects the relatively high pressure region of the refrigeration cycle (the oil separator 4) and the crank chamber 5 so that the pressure in the crank chamber 5 is adjusted.
- the present invention is embodied in a so-called supply-side control valve, in which the control valve is arranged in the supply passage 7.
- a control valve varies the opening degree of the bleed passage 6 that interconnects the crank chamber 5 and the relatively low pressure region of the refrigeration cycle (for example, the suction chamber 2) so that the pressure in the crank chamber 5 is adjusted.
- the present invention is embodied in a so-called bleed-side control valve, in which the control valve is arranged in the bleed passage 6.
- control valve CV internally and autonomously positions the valve portion 31 in accordance with the variation of the pressure differential so as to maintain the set pressure differential determined by electric power externally supplied.
- the present invention is embodied in a so-called external control valve.
- the present invention is not limited to be embodied in the external control valve but may be embodied in an internal control valve or a mere electromagnetic valve.
- a variable displacement compressor optionally varies displacement based upon pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle.
- a control valve of the variable displacement compressor has a valve seat and a valve.
- the valve seat has a seat surface for adjusting the opening degree of the passage.
- the valve has a valve surface for adjusting the opening degree of the passage. At least one of the seat surface and the valve surface is made of a material with relatively high hardness.
Abstract
Description
- The present invention relates to a control valve for controlling the displacement of a variable displacement compressor in a refrigeration cycle.
- A variable displacement swash plate type compressor for use in a refrigeration cycle optionally varies the inclination angle of a swash plate or the displacement of the compressor by adjusting pressure in a crank chamber or a chamber for accommodating the swash plate, as disclosed in page 15 to 16 and FIG. 12 of Unexamined Japanese Patent Publication No. 2001-173556.
- Namely, the compressor provides a control valve for adjusting the pressure in the crank chamber. The control valve, for example, varies the opening degree of a supply passage that interconnects a relatively high pressure region of the refrigeration cycle and the crank chamber. A relatively low pressure region of the refrigeration cycle and the crank chamber are interconnected through a bleed passage.
- The opening degree of the control valve is adjusted to control a balance between the amount of relatively high pressure refrigerant gas introduced from the relatively high pressure region to the crank chamber through the supply passage and the amount of refrigerant gas delivered from the crank chamber to the relatively low pressure region through the bleed passage. Thus, the pressure in the crank chamber is determined. The inclination angle of the swash plate is varied in accordance with the variation of the pressure in the crank chamber. As a result, the stroke of pistons, that is, the displacement of the compressor, is adjusted.
- Recently carbon dioxide has been generally used as refrigerant for a refrigeration cycle in place of conventional chlorofluorocarbon. As carbon dioxide is used as refrigerant, pressure difference between relatively high and low pressures in a refrigeration cycle becomes much larger than that of chlorofluorocarbon (for example, 10Mpa). Accordingly, in the above structure that adjusts the displacement of the compressor by utilizing pressure difference in the refrigeration cycle, the refrigerant gas may flow through the inside of the control valve at relatively high speed based on the pressure differential generated in the refrigeration cycle.
- As the refrigerant gas flows through the inside of the control valve at relatively high speed, erosion arises inside the control valve by fine foreign particles (for example, solid particles of 10 to 20 µm), which are contained in the refrigerant gas and cannot perfectly be removed by a filter. In view of the structure of the control valve, erosion tends to arise around a portion for adjusting the opening degree of the control valve where the flow of refrigerant gas largely and intricately winds. Particularly, a seat surface of a valve seat and a valve surface of a valve body for opening and closing the control valve constitute a portion for adjusting the opening degree of the control valve. As flaw arises at the seat surface and the valve surface, refrigerant gas leaks through the flaw in a state when the control valve is fully closed, that is, the seat surface is in contact with the valve surface. As a result, the displacement of the compressor in a state when the control valve is fully closed is not maintained. Therefore, there is a need for a control valve that reduces the leakage of refrigerant gas in a state when the control valve is fully closed for a variable displacement compressor.
- In accordance with the present invention, a variable displacement compressor optionally varies displacement based upon pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle. A control valve of the variable displacement compressor has a valve seat and a valve. The valve seat has a seat surface for adjusting the opening degree of the passage. The valve has a valve surface for adjusting the opening degree of the passage. At least one of the seat surface and the valve surface is made of a material with relatively high hardness.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
- The features of the present invention that are believed to be novel are set forth with particularity in the appended claims. The invention together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiments together with the accompanying drawings in which:
- FIG. 1 A illustrates a schematic view of a variable displacement swash plate type compressor and a longitudinal cross-sectional view of a control valve according to a preferred embodiment of the present invention; and
- FIG. 1 B illustrates a partially enlarged cross-sectional view of a adjacent portion for adjusting the opening degree of the control valve according to the preferred embodiment of the present invention.
-
- A preferred embodiment of the present invention will now be described with reference to FIGs. 1 A and 1 B.
- FIG. 1 A illustrates a schematic view of a variable displacement swash plate type compressor 1 (hereinafter the compressor 1) for a refrigeration cycle of a vehicle air conditioner. The compressor 1 introduces refrigerant gas from a
suction chamber 2 into acompression chamber 1 a, then compresses the introduced refrigerant gas and discharges the compressed refrigerant gas to adischarge chamber 3 as the volume of thecompression chamber 1 a is varied by the rotation of a swash plate (not shown). Anoil separator 4 is arranged near an outlet of thedischarge chamber 3 for separating misty lubricating oil contained in the refrigerant gas from the refrigerant gas. Incidentally, carbon dioxide is employed as refrigerant for the refrigeration cycle. - In the compressor 1, a
crank chamber 5, which accommodates the swash plate, communicates with thesuction chamber 2, which is a relatively low pressure region in the refrigeration cycle, through a bleed passage 6. Theoil separator 4, which is a relatively high pressure region in the refrigeration cycle, communicates with thecrank chamber 5 through asupply passage 7. In theoil separator 4, the lubricating oil separated from the refrigerant gas is supplied into thecrank chamber 5 through thesupply passage 7 together with a part of the refrigerant gas and lubricates sliding portions in thecrank chamber 5. Namely, thesupply passage 7 doubles as a feeding passage for feeding the lubricating oil separated by theoil separator 4 to thecrank chamber 5. - Incidentally, a
filter 8 is arranged at the upstream side (the side of the oil separator 4) of thesupply passage 7 for removing foreign particles in the refrigerant gas. Thefilter 8 has a mesh size for only removing the foreign particles of 20 to 30 µm or above in view of interference against the flow of refrigerant gas. - A control valve CV is arranged in the
supply passage 7 and optionally adjusts the opening degree of thesupply passage 7. The adjustment of the opening degree of the control valve CV controls a balance between the amount of relatively high pressure refrigerant gas introduced from thedischarge chamber 3 into thecrank chamber 5 through thesupply passage 7 and the amount of refrigerant gas delivered from thecrank chamber 5 to thesuction chamber 2 through the bleed passage 6. Thus, the pressure in thecrank chamber 5 is determined. The inclination angle of the swash plate is varied in accordance with the variation of the pressure in thecrank chamber 5 so that the displacement of the compressor 1 is adjusted. - For example, as the pressure in the
crank chamber 5 reduces by decreasing the opening degree of the control valve CV, the inclination angle of the swash plate increases so that the displacement of the compressor 1 increases. On the contrary, as the pressure in thecrank chamber 5 rises by increasing the opening degree of the control valve CV, the inclination angle of the swash plate reduces so that the displacement of the compressor 1 reduces. - The control valve will now be described.
- As shown in FIG. 1A, a
valve housing 10 of the control valve CV includes avalve body 11 on the upper side and anactuator housing 12 on the lower side in the drawing. Starting from the lower side of the drawing, a valve chamber 22, acommunication passage 23 and apressure sensing chamber 24 are respectively defined in thevalve body 11. Avalve rod 25 is movably arranged through the valve chamber 22 and thecommunication passage 23 so as to extend in the axial direction of the valve housing 10 (the vertical direction of the drawing). The upper end of thevalve rod 25 inserted through thecommunication passage 23 separates thecommunication passage 23 from thepressure sensing chamber 24. - The
communication passage 23 communicates with theoil separator 4 of the compressor 1 through the upstream portion of thesupply passage 7. The valve chamber 22 communicates with thecrank chamber 5 of the compressor 1 through the downstream portion of thesupply passage 7. The valve chamber 22 and thecommunication passage 23 constitute a portion of thesupply passage 7. - As shown in FIGs. 1A and 1B, a
valve portion 31 formed at the middle portion of thevalve rod 25 is arranged in the valve chamber 22. In thevalve body 11, a step between the valve chamber 22 and thecommunication passage 23 forms avalve seat 32, and accordingly thecommunication passage 23 forms a valve hole. As thevalve rod 25 moves upward from a state where the communication passage 23 (the supply passage 7) is opened as illustrated in FIG. 1A to a state where thevalve portion 31 reaches at thevalve seat 32, aplanar valve surface 31 a of thevalve portion 31 contacts on aplanar seat surface 32a of thevalve seat 32 so that the communication passage 23 (the supply passage 7) is closed. Acoil spring 60 for urging thevalve rod 25 is arranged in the valve chamber 22. Thecoil spring 60 urges thevalve rod 25 in a direction in which thevalve portion 31 leaves away from thevalve chamber 32. - A bellows 33, which has a cylindrical shape, is accommodated in the
pressure sensing chamber 24. The upper end of thebellows 33 is fixed to thevalve housing 10. The upper end of thevalve rod 25 is fitted to the lower end of thebellows 33. The bellows 33 has a bottom at one end and partitions thepressure sensing chamber 24 into afirst pressure chamber 49 and asecond pressure chamber 50. - A fixed
throttle 41 is provided in adischarge passage 40, which interconnects thedischarge chamber 3 with an external refrigerant circuit (not shown). Thefirst pressure chamber 49 communicates with thedischarge passage 40 through a firstpressure introducing passage 42 and connects at the upstream side (the side of the discharge chamber 3) relative to the fixedthrottle 41. Thesecond pressure chamber 50 communicates with thedischarge passage 40 through a secondpressure introducing passage 43 and connects at the downstream side relative to the fixedthrottle 41. Accordingly, thebellows 33 reflects the variation of pressure difference between the upstream side and downstream side of the fixedthrottle 41 for positioning of the valve rod 25 (the valve portion 31) as the lower end portion of thebellows 33 moves in accordance with the pressure difference. Incidentally, thebellows 33 moves thevalve portion 31 in such a manner that the displacement of the compressor 1 varies to cancel the variation of the pressure difference between the upstream side and downstream side of the fixedthrottle 41. - An
electromagnetic actuator 51 is provided at the lower side of thevalve housing 10. Theelectromagnetic actuator 51 provides a cylindrical accommodating cylinder 52 with a bottom at one end in the middle of theactuator housing 12. Acenter post 53, which has a columnar shape, is fixedly fitted to the opening of the accommodating cylinder 52 on the upper side. This fitting of thecenter post 53 defines aplunger chamber 54 at the lowest portion of the accommodating cylinder 52. - A
plunger 56 is accommodated in theplunger chamber 54 and is movable in the axial direction (the vertical direction of the FIG. 1A). Aguide hole 57 extends through the center of thecenter post 53 in the axial direction of thecenter post 53. The lower side of thevalve rod 25 is movably arranged in theguide hole 57. The lower end of thevalve rod 25 is fixedly fitted to theplunger 56 in theplunger chamber 54. Accordingly, theplunger 56 and thevalve rod 25 integrally move up and down anytime. - A
coil 61 winds around the outer circumference of the accommodating cylinder 52 and partially covers an area from thecenter post 53 to theplunger 56. Thecoil 61 is supplied with electric power based upon a command of an air conditioner ECU (not shown). Accordingly, the magnitude of electromagnetic force (electromagnetic attraction) corresponding to electric power supplied to thecoil 61 is generated between theplunger 56 and thecenter post 53. The electromagnetic force is transmitted to the valve rod 25 (the valve portion 31) through theplunger 56. - In the above control valve CV, the
electromagnetic actuator 51 varies electromagnetic force applied to thevalve portion 31 in accordance with the electric power externally supplied so that a control target for pressure difference between the upstream side and downstream side of the fixed throttle 41 (set pressure differential), which is a reference for positioning action of thevalve portion 31 by thebellows 33, is optionally changed. Namely, the control valve CV internally and autonomously positions the valve rod 25 (the valve portion 31) in accordance with the variation of the pressure difference so as to maintain the set pressure difference determined by electric power supplied to thecoil 61. In addition, this set pressure difference is externally varied by adjusting electric power supplied to thecoil 61. - As mentioned in the prior art, in the preferred embodiment where the displacement of the compressor 1 is adjusted by utilizing the pressure difference in the refrigeration cycle, the refrigerant gas may flow through the
supply passage 7 at relatively high speed. Then, in the control valve CV that opens and closes thesupply passage 7, theseat surface 32a of thevalve seat 32 and thevalve surface 31 a of thevalve portion 31, which are portions for adjusting the opening degree of the control valve CV, both are made of materials with relatively high hardness for protection against erosion. - Incidentally, the word of "a material with relatively high hardness" in the preferred embodiment means that a material with Vickers hardness of 500 or above because pressure difference between relatively high and low pressures in the refrigeration cycle occasionally becomes approximately 10MPa and particles, which cause erosion are constituted of fine solid particles (10 to 20 µm) such as silicon oxide with relatively high hardness. The material of the
valve seat 32 is brass and has Vickers hardness of approximately 200. Accordingly, to obtain a material of theseat surface 32a of thevalve seat 32 with relatively high hardness, the surface of the material of thevalve seat 32 is coated with ahigh hardness layer 32b by nickel-phosphorus plating. Thus, theseat surface 32a of thevalve seat 32 is constituted of a relatively high hardness material with Vickers hardness of 500 to 800. - Additionally, the material of the valve rod 25 (the valve portion 31) is stainless steel (SUS) and has Vickers hardness of approximately 300. Accordingly, to obtain a material of the
valve surface 31a of thevalve portion 31 with relatively high hardness, the surface of the material of thevalve portion 31 is coated with ahigh hardness layer 31b by salt-bath nitriding. Thus, thevalve surface 31a of thevalve portion 31 is constituted of a relatively high hardness material with Vickers hardness of 900 to 1100. - Incidentally, the thicknesses of the above
high hardness layers high hardness layers coil spring 60 is not shown in FIG. 1B. - According to the above preferred embodiment, the following advantageous effects are obtained.
- (1) In the control valve CV, the
seat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31 are made of a material with relatively high hardness. Accordingly, even if foreign particles contained in the refrigerant gas collide with theseat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31, they hardly arise flaws. Accordingly, the leakage of the refrigerant gas due to the flaws in a state when the control valve CV is fully closed reduces. As a result, the displacement of the compressor 1 corresponding to a state when the control valve CV is fully closed (maximum displacement in the preferred embodiment) is maintained. - (2) The
high hardness layer 32b of thevalve seat 32 is made of a material that is different from that of thehigh hardness layer 31b of thevalve portion 31. Accordingly, a same-metal phenomenon is prevented between theseat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31. The same-metal phenomenon means that mutually same metals lead to inconveniences such as an increase in coefficient of friction. - (3) The
supply passage 7 doubles as a feeding passage for feeding lubricating oil separated by theoil separator 4 to the crankchamber 5. In theoil separator 4, foreign particles are also separated while the lubricating oil is separated from the refrigerant gas. Accordingly, for example, in comparison to thesupply passage 7 that does not double as the feeding passage, the more foreign particles pass through the inside of the control valve CV. In the control valve CV, theseat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31 are made of materials with relatively high hardness. Even when under the above hard condition, the leakage of the refrigerant gas is reliably reduced in a state where the control valve CV is fully closed. However, the present invention is embodied in a structure that thesupply passage 7 doubles as the feeding passage for feeding the lubricating oil from theoil separator 4 to the crankchamber 5 so that the leakage of the refrigerant gas is much effectively reduced in a state when the control valve CV is fully closed. - (4) The compressor 1 is a refrigerant compressor for use in a refrigeration
cycle, and carbon dioxide is employed as refrigerant for the refrigeration cycle.
Accordingly, for example, in comparison to a state where chlorofluorocarbon
refrigerant is used, pressure difference between relatively high and low pressures
of the refrigerant in the control valve CV becomes much larger, and the flow
speed of the refrigerant becomes much faster. As a result, the
seat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31 are easily damaged due to the foreign particles. Namely, the present invention is embodied in the control valve of the carbon-dioxide-refrigerant compressor so that the leakage of the refrigerant gas is effectively reduced in a state when the control valve CV is fully closed. -
- The present invention is not limited to the embodiment described above but may be modified into the following alternative embodiments.
- In an alternative embodiment to those of the above preferred embodiment, either of the
seat surface 32a of thevalve seat 32 or thevalve surface 31a of thevalve portion 31 is made of a material with relatively high hardness. In this state, the same advantageous effect to that of the paragraph (1) is obtained. That is, the leakage of the refrigerant gas is reduced in a state when the control valve CV is fully closed. However, obviously, both of theseat surface 32a of thevalve seat 32 and thevalve surface 31a of thevalve portion 31, which are respectively made of materials with relatively high hardness, more reliably perform the above advantageous effect. - In the preferred embodiment, the
seat surface 32a of thevalve seat 32 is constituted of a material with relatively high hardness in such a manner that the material of thevalve seat 32 is treated with surface hardening by nickel-phosphorus plating. In an alternative embodiment to those of the above preferred embodiment, the surface hardening of the material of thevalve seat 32 is selected from the group consisting of nickel plating, nickel-phosphorus-boron plating, nickel-boron plating, nickel-boron-tungsten plating, chrome plating and copper plating. Thus, theseat surface 32a is constituted of a material with relatively high hardness. - Also, the
seat surface 32a of thevalve seat 32 is not limited to be hardened with the surface hardening by plating but may be hardened by one of ion nitriding, gas nitrocarburizing and salt-bath nitriding. Thus, thevalve surface 31 a is constituted of a material with relatively high hardness. - Furthermore, the
valve surface 31a of thevalve portion 31 is not limited to be hardened with the surface hardening by nitriding. Thevalve surface 31a of thevalve portion 31 may be hardened with the surface hardening of a material of thevalve portion 31 by one of nickel plating, nickel-phosphorus plating, nickel-phosphorus-boron plating, nickel-boron plating, nickel-boron-tungsten plating, chrome plating and copper plating. - Alternatively, the material of the valve portion 31 (the valve rod 25) is steel for carburizing, and the surface of the material is hardened by carburizing so as to form the
valve surface 31a with relatively high hardness. - In an alternative embodiment to those of the above preferred embodiment, the material of the
valve seat 32 is not limited to brass but may be another copper series material, aluminum series material or stainless steel (SUS). - In the preferred embodiment, the control valve CV varies the opening degree of the
supply passage 7 that interconnects the relatively high pressure region of the refrigeration cycle (the oil separator 4) and thecrank chamber 5 so that the pressure in thecrank chamber 5 is adjusted. Namely, the present invention is embodied in a so-called supply-side control valve, in which the control valve is arranged in thesupply passage 7. In an alternative embodiment to those of the above preferred embodiment, a control valve varies the opening degree of the bleed passage 6 that interconnects thecrank chamber 5 and the relatively low pressure region of the refrigeration cycle (for example, the suction chamber 2) so that the pressure in thecrank chamber 5 is adjusted. Thus, the present invention is embodied in a so-called bleed-side control valve, in which the control valve is arranged in the bleed passage 6. - In the preferred embodiment, the control valve CV internally and autonomously positions the
valve portion 31 in accordance with the variation of the pressure differential so as to maintain the set pressure differential determined by electric power externally supplied. Namely, the present invention is embodied in a so-called external control valve. However, the present invention is not limited to be embodied in the external control valve but may be embodied in an internal control valve or a mere electromagnetic valve. - Therefore, the present examples and embodiments are to be considered as illustrative and not restrictive, and the invention is not to be limited to the details given herein but may be modified within the scope of the appended claims.
- A variable displacement compressor optionally varies displacement based upon pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle. A control valve of the variable displacement compressor has a valve seat and a valve. The valve seat has a seat surface for adjusting the opening degree of the passage. The valve has a valve surface for adjusting the opening degree of the passage. At least one of the seat surface and the valve surface is made of a material with relatively high hardness.
Claims (10)
- A control valve of a variable displacement compressor that optionally varies displacement based on pressure in a crank chamber for adjusting the pressure in the crank chamber by varying an opening degree of a passage that interconnects the crank chamber and one of relatively high and low pressure regions of the refrigeration cycle, characterized in that a valve seat has a seat surface for adjusting the opening degree of the passage, in that a valve has a valve surface for adjusting the opening degree of the passage, and in that at least one of the seat surface and the valve surface is made of a material with relatively high hardness.
- The control valve according to claim 1, wherein both the seat surface of the valve seat and the valve surface of the valve are made of materials with relatively high hardness.
- The control valve according to any one of claims 1 and 2, wherein the seat surface and the valve surface are made of different materials from each other.
- The control valve according to any one of claims 1 through 3, wherein the material with relatively high hardness is formed by surface hardening that is selected from the group consisting of nickel plating, nickel-phosphorus plating, nickel-boron plating, nickel-phosphorus-boron plating, nickel-boron-tungsten plating, chrome plating, copper plating, salt-bath nitriding, ion nitriding, gas nitrocarburizing and carburizing.
- The control valve according to any one of claims 1 through 4, wherein an oil separator is arranged in the relatively high pressure region of the refrigeration cycle for separating lubricating oil from refrigerant gas that flows in the relatively high pressure region, the passage interconnecting the oil separator and the crank chamber so as to double as a feeding passage for feeding the lubricating oil separated in the oil separator to the crank chamber.
- The control valve according to any one of claims 1 through 5, wherein carbon dioxide is employed as refrigerant for the refrigeration cycle.
- The control valve according to claim 1, wherein the material with relatively high hardness has Vickers hardness of 500 or above.
- The control valve according to claim 7, wherein the material of the seat surface has Vickers hardness of 500 to 800.
- The control valve according to any one of claims 7 and 8, wherein the material of the valve surface has Vickers hardness of 900 to 1100.
- The control valve according to any one of claims 1 through 9, wherein maximum pressure difference between the relatively high and low pressure regions exceeds 10 MPa.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002330720A JP2004162640A (en) | 2002-11-14 | 2002-11-14 | Control valve for variable displacement compressor |
JP2002330720 | 2002-11-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1420162A2 true EP1420162A2 (en) | 2004-05-19 |
EP1420162A3 EP1420162A3 (en) | 2004-09-15 |
Family
ID=32171396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03025917A Withdrawn EP1420162A3 (en) | 2002-11-14 | 2003-11-12 | Control valve for variable displacement compressor |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040118140A1 (en) |
EP (1) | EP1420162A3 (en) |
JP (1) | JP2004162640A (en) |
KR (1) | KR20040042801A (en) |
CN (1) | CN1508426A (en) |
BR (1) | BR0305196A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1777412A1 (en) * | 2004-07-13 | 2007-04-25 | Sanden Corporation | Capacity control valve for variable displacement swash plate type compressor |
EP2963293A1 (en) * | 2014-06-19 | 2016-01-06 | TGK CO., Ltd. | Control valve for variable displacement compressor |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007177627A (en) * | 2005-12-27 | 2007-07-12 | Sanden Corp | Discharge capacity control valve of variable displacement compressor |
JP4607047B2 (en) * | 2006-04-28 | 2011-01-05 | サンデン株式会社 | Variable displacement compressor discharge capacity control valve |
JP4599327B2 (en) * | 2006-05-23 | 2010-12-15 | サンデン株式会社 | Variable capacity compressor |
JP2011099542A (en) * | 2009-11-09 | 2011-05-19 | Fujikin Inc | Control valve device |
CN103547804B (en) * | 2011-05-23 | 2016-03-09 | 学校法人斗源学院 | Control valve for variable displacement compressor and the method for the manufacture of this control valve |
DE102012202859A1 (en) * | 2012-02-24 | 2013-08-29 | Mahle International Gmbh | Valve system for charge exchange control |
CN104373650A (en) * | 2014-11-18 | 2015-02-25 | 温州仁谦汽车油泵有限公司 | Leaf spring type constant pressure valve |
CN104697505B (en) * | 2015-03-20 | 2017-03-08 | 张家港海纳德智能科技有限公司 | A kind of rotatable parts for instrument of surveying and mapping and its manufacture method |
US11060493B2 (en) * | 2019-03-29 | 2021-07-13 | Delphi Technologies Ip Limited | Fuel pump for gasoline direct injection |
CN115427717A (en) * | 2020-04-22 | 2022-12-02 | 伊格尔工业股份有限公司 | Capacity control valve |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683804A (en) * | 1985-01-18 | 1987-08-04 | Taiho Kogyo Kabushiki Kaisha | Swash plate type compressor shoe |
EP0961031A2 (en) * | 1998-05-27 | 1999-12-01 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Regulating valve for variable displacement swash plate compressor and its assembly method |
US6015269A (en) * | 1996-12-10 | 2000-01-18 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
EP1061257A1 (en) * | 1999-06-15 | 2000-12-20 | Fujikoki Corporation | Regulating valve for variable displacement swash plate compressor and its assembly method |
EP1172556A2 (en) * | 2000-07-14 | 2002-01-16 | Kabushiki Kaisha Toyota Jidoshokki | Swash plate compressor piston shoes |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR880005354A (en) * | 1986-10-08 | 1988-06-28 | 나까무라 겐조 | Electronic actuator |
US5080131A (en) * | 1989-09-26 | 1992-01-14 | Lintec Co., Ltd. | Mass flow controller |
US5676309A (en) * | 1994-12-06 | 1997-10-14 | The Lee Company | Thermally responsive flow control valve |
JP3585150B2 (en) * | 1997-01-21 | 2004-11-04 | 株式会社豊田自動織機 | Control valve for variable displacement compressor |
JP3469435B2 (en) * | 1997-06-27 | 2003-11-25 | 日本ピストンリング株式会社 | Valve seat for internal combustion engine |
JP4000694B2 (en) * | 1997-12-26 | 2007-10-31 | 株式会社豊田自動織機 | Capacity control valve in variable capacity compressor |
JP3728387B2 (en) * | 1998-04-27 | 2005-12-21 | 株式会社豊田自動織機 | Control valve |
US6321564B1 (en) * | 1999-03-15 | 2001-11-27 | Denso Corporation | Refrigerant cycle system with expansion energy recovery |
JP4418571B2 (en) * | 2000-04-11 | 2010-02-17 | シーケーディ株式会社 | High temperature gas control valve |
JP3918516B2 (en) * | 2001-11-07 | 2007-05-23 | 株式会社豊田自動織機 | Swash plate compressor |
US6840054B2 (en) * | 2001-12-21 | 2005-01-11 | Visteon Global Technologies, Inc. | Control strategy of a variable displacement compressor operating at super critical pressures |
US6715995B2 (en) * | 2002-01-31 | 2004-04-06 | Visteon Global Technologies, Inc. | Hybrid compressor control method |
-
2002
- 2002-11-14 JP JP2002330720A patent/JP2004162640A/en active Pending
-
2003
- 2003-09-08 KR KR1020030062498A patent/KR20040042801A/en not_active Application Discontinuation
- 2003-11-12 EP EP03025917A patent/EP1420162A3/en not_active Withdrawn
- 2003-11-12 US US10/712,910 patent/US20040118140A1/en not_active Abandoned
- 2003-11-13 BR BR0305196-0A patent/BR0305196A/en not_active IP Right Cessation
- 2003-11-13 CN CNA200310120943XA patent/CN1508426A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4683804A (en) * | 1985-01-18 | 1987-08-04 | Taiho Kogyo Kabushiki Kaisha | Swash plate type compressor shoe |
US6015269A (en) * | 1996-12-10 | 2000-01-18 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Variable displacement compressor |
EP0961031A2 (en) * | 1998-05-27 | 1999-12-01 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Regulating valve for variable displacement swash plate compressor and its assembly method |
EP1061257A1 (en) * | 1999-06-15 | 2000-12-20 | Fujikoki Corporation | Regulating valve for variable displacement swash plate compressor and its assembly method |
EP1172556A2 (en) * | 2000-07-14 | 2002-01-16 | Kabushiki Kaisha Toyota Jidoshokki | Swash plate compressor piston shoes |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1777412A1 (en) * | 2004-07-13 | 2007-04-25 | Sanden Corporation | Capacity control valve for variable displacement swash plate type compressor |
EP1777412A4 (en) * | 2004-07-13 | 2007-12-26 | Sanden Corp | Capacity control valve for variable displacement swash plate type compressor |
EP2963293A1 (en) * | 2014-06-19 | 2016-01-06 | TGK CO., Ltd. | Control valve for variable displacement compressor |
Also Published As
Publication number | Publication date |
---|---|
BR0305196A (en) | 2004-08-31 |
US20040118140A1 (en) | 2004-06-24 |
EP1420162A3 (en) | 2004-09-15 |
CN1508426A (en) | 2004-06-30 |
KR20040042801A (en) | 2004-05-20 |
JP2004162640A (en) | 2004-06-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100392121B1 (en) | capacity control system of capacity variable type compressor | |
US6485267B1 (en) | Control valve for variable capacity compressors | |
EP1420162A2 (en) | Control valve for variable displacement compressor | |
JP4162419B2 (en) | Variable capacity compressor | |
JP4436295B2 (en) | Variable capacity compressor | |
EP0550201B1 (en) | Slant plate type compressor with variable capacity control mechanism | |
US20050008499A1 (en) | Displacement control mechanism for variable displacement compressor | |
US20060165534A1 (en) | Displacement control valve for variable displacement compressor | |
EP1489304A1 (en) | Displacement control mechanism of a variable displacement type compressor | |
KR20060050534A (en) | Control valve for variable displacement compressor | |
EP1256718A2 (en) | Control valve for variable displacement compressor | |
KR100370749B1 (en) | Variable displacement type compressor | |
US7437881B2 (en) | Control valve for variable displacement compressor | |
EP1717444B1 (en) | Displacement control valve for clutchless type variable displacement compressor | |
KR100450696B1 (en) | Control valve of variable capacity type compressor | |
US7207185B2 (en) | Vehicle air conditioning apparatus | |
EP1512871A1 (en) | Capacity control valve for variable displacement compressor | |
US6250891B1 (en) | Variable displacement compressor having displacement controller | |
US20040165994A1 (en) | Displacement varying structure of variable displacement compressor | |
EP0325168B1 (en) | Slant plate type compressor with variable displacement mechanism | |
US20090074592A1 (en) | Compressor and method for operating the same | |
CN1088156C (en) | Variable conpacitance compressor | |
JP2005127283A (en) | Displacement control valve for variable displacement compressor | |
US7364408B2 (en) | Crank case shut off valve | |
KR101880857B1 (en) | Compressor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20031112 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: 7F 04B 53/10 B Ipc: 7F 04B 27/18 A |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Effective date: 20050216 |