WO2011067940A1 - 制御弁及び制御弁を備えた斜板式可変容量圧縮機 - Google Patents
制御弁及び制御弁を備えた斜板式可変容量圧縮機 Download PDFInfo
- Publication number
- WO2011067940A1 WO2011067940A1 PCT/JP2010/007063 JP2010007063W WO2011067940A1 WO 2011067940 A1 WO2011067940 A1 WO 2011067940A1 JP 2010007063 W JP2010007063 W JP 2010007063W WO 2011067940 A1 WO2011067940 A1 WO 2011067940A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- control valve
- chamber
- bellows
- valve body
- Prior art date
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Classifications
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- 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
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- 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
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- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
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- 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
- F04B2027/1809—Controlled pressure
- F04B2027/1813—Crankcase pressure
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- 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
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- 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
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- 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
- F04B2027/1854—External parameters
Definitions
- the present invention relates to a control valve that controls opening and closing of a fluid passage.
- a control valve that controls the opening and closing of a fluid passage.
- the pressure sensing unit has a bellows that expands and contracts in response to external fluid pressure, a valve body that opens and closes a fluid passage according to the expansion and contraction of the bellows, and an electromagnetic Patent Documents 1 and 2 disclose a control valve that includes a solenoid unit that applies force, and in which a pressure-sensitive unit is disposed inside the solenoid unit.
- a pressure-sensitive unit is disposed inside the movable core
- the pressure-sensitive unit is disposed inside the fixed core. The control valve is reduced in size by disposing the pressure sensitive unit in the solenoid unit.
- the control valves of Patent Documents 1 and 2 have a problem that the structure of the solenoid unit is complicated and the assembly of the control valve is deteriorated because the pressure-sensitive unit independent of the solenoid unit is built in the solenoid unit. .
- the present invention has been made in view of the above problems, and an object thereof is to provide a control valve having a simple structure in which a pressure-sensitive unit is disposed in a solenoid unit, and a swash plate type variable displacement compressor including the control valve. And
- a control valve for controlling opening and closing of a fluid passage, which has a bellows that expands and contracts by receiving the pressure of the fluid from the outside, and a fluid according to the expansion and contraction of the bellows.
- a valve body that opens and closes the passage; and a solenoid unit that applies electromagnetic force to the valve body.
- the pressure-sensitive unit is disposed in the solenoid unit, and the pressure-sensitive unit is formed of a ferromagnetic material at one end of the bellows.
- the movable end portion has a fixed end portion made of a ferromagnetic material at the other end of the bellows, and the movable end portion and the fixed end portion face each other with a predetermined gap inside the bellows, and the movable end portion
- a control valve is provided in which the fixed end forms a magnetic circuit of a solenoid unit. Since the magnetic circuit of the solenoid unit is formed inside the pressure-sensitive unit, the components of the pressure-sensitive unit can also serve as the components of the solenoid unit, which simplifies the structure and contributes to cost reduction. Assembling becomes easy.
- the solenoid unit has a movable core and a fixed core
- the movable end of the pressure-sensitive unit forms a movable core
- the fixed end forms a fixed core.
- the movable end and the fixed end of the pressure-sensitive unit can form the movable core and the fixed core of the solenoid unit, respectively.
- control valve includes urging means for pulling the movable end portion away from the fixed end portion, and the urging means is disposed inside the fixed end portion. Since the biasing means is arranged inside the fixed end, the outer diameter of the movable end and the fixed end protruding into the inner space of the bellows can be increased to the limit of the inner diameter of the bellows, and the magnetic pole area between both ends is effective. Can be secured.
- the control valve includes a transmission rod formed of a nonmagnetic material that penetrates the inside of the fixed end portion and contacts the movable end portion, and the urging means moves through the transmission rod to the movable end.
- the control rod is separated from the fixed end, and the transmission rod is formed with a restricting portion for restricting the minimum gap between the movable end and the fixed end. Since a restricting portion that restricts the minimum gap between the movable end portion and the fixed end portion is provided on the transmission rod formed of a nonmagnetic material that transmits the urging force of the urging means, it is necessary to provide a new restricting means. And the structure is simplified.
- the solenoid unit includes a bottomed cylindrical sleeve that accommodates the pressure-sensitive unit at the center, the outer peripheral surface of the fixed end is press-fitted and fixed to the inner peripheral surface of the sleeve, and the outer periphery of the movable end The surface is slidably supported on the inner circumferential surface of the sleeve.
- the pressure sensitive unit can be fixed and supported easily, and the movable end can be prevented from shaking in the radial direction.
- a communication passage that connects the fluid passage and the space around the bellows is formed on the outer peripheral surface of the movable end portion. Since the fluid pressure surely acts around the bellows, the bellows reliably expands and contracts in response to a change in the fluid pressure.
- the inside of the pressure sensitive unit is maintained at a negative pressure. Since the inside of the pressure-sensitive unit is maintained at a negative pressure, foreign matter mixed in the fluid does not enter the gap between the movable end and the fixed end, and the expansion and contraction of the bellows is hindered by the foreign matter. There is nothing.
- the bellows is formed of a stainless steel material.
- a stainless steel material In consideration of the bondability between the movable end portion and the fixed end portion made of soft iron, electromagnetic stainless steel or the like, it is desirable to form the bellows with a stainless steel material.
- the fluid is a refrigerant that flows through the swash plate type variable capacity compressor
- the fluid passage is a communication passage that connects the discharge chamber and the crank chamber, and a communication passage that connects the crank chamber and the suction chamber.
- the fluid pressure is the crank chamber pressure or the suction chamber pressure.
- the fluid passage controlled by the control valve may be a communication passage that connects the discharge chamber and the crank chamber, or a communication passage that connects the crank chamber and the suction chamber, or both.
- the fluid pressure applied to the pressure-sensitive unit may be the crank chamber pressure or the suction chamber pressure.
- the present invention provides a swash plate type variable displacement compressor provided with the above control valve.
- the swash plate type variable capacity compressor adjusts the pressure in the crank chamber by using a control valve that includes a pressure-sensitive unit that senses refrigerant pressure and a solenoid unit that changes the operating point of the pressure-sensitive unit.
- a control valve that includes a pressure-sensitive unit that senses refrigerant pressure and a solenoid unit that changes the operating point of the pressure-sensitive unit.
- a swash plate type variable displacement compressor includes a discharge chamber, a suction chamber, a crank chamber, a plurality of cylinder bores, a piston disposed in the cylinder bore, a piston disposed in the cylinder bore, and a crank chamber.
- a drive shaft a conversion mechanism for converting the rotation of the drive shaft into a reciprocating motion of the piston, a first communication path for communicating the discharge chamber with the crank chamber, a first A control valve that opens and closes the communication path; a second communication path that connects the crank chamber to the suction chamber; and a throttle disposed in the second communication path;
- the variable capacity compressor controls the amount of refrigerant sucked from the suction chamber into the cylinder bore by adjusting the stroke of the piston, and the control valve is connected to the suction chamber by connecting the pressure sensitive unit and the valve body.
- the pressure of Solenoi When the pressure is higher than a predetermined value determined by the electromagnetic force, the valve body moves in the direction to close the first communication path, and when the suction chamber pressure falls below the predetermined value, the valve body moves in the direction to open the first communication path.
- a valve mechanism that autonomously controls the pressure in the suction chamber to a predetermined value, the connecting portion between the pressure-sensitive unit and the valve body constitutes a valve mechanism, and the connecting portion between the pressure-sensitive unit and the valve body is separated Forms a third communication passage for communicating the crank chamber with the suction chamber via the inside of the valve body, and a connecting member connected to the valve body is fixed to the movable end of the pressure-sensitive unit, and the connecting member is made of a non-magnetic material.
- the connecting part between the valve body and the pressure-sensitive unit constitutes the valve mechanism, but since the connecting part is made of a non-magnetic material, the magnetic material foreign matter does not adhere to the contact part of the connecting part. The contact and separation of the parts are not impaired by the foreign material of the magnetic material.
- FIG. (A) is a figure which shows the whole
- (b) is a figure which shows a 1st communicating path
- (c) is a figure which shows a 3rd communicating path
- (d) is a figure which shows a pressure-sensitive unit.
- (e) is a view showing a sleeve. It is a figure which shows the suction pressure control characteristic of the control valve of Example 1.
- FIG. It is sectional drawing of the control valve of Example 2.
- FIG. (A) is a figure which shows the whole
- (b) is a figure which shows a communicating path. It is sectional drawing of the control valve which concerns on another Example. It is sectional drawing of the control valve which concerns on another Example. It is sectional drawing of the control valve which concerns on another Example.
- a swash plate type variable displacement compressor 100 includes a cylinder block 101 having a plurality of cylinder bores 101 a, a front housing 102 provided at one end of the cylinder block 101, and a valve at the other end of the cylinder block 101. And a cylinder head 104 provided via a plate 103.
- a drive shaft 106 is provided across the crank chamber 105 defined by the cylinder block 101 and the front housing 102, and a swash plate 107 is disposed around the center in the longitudinal direction.
- the swash plate 107 is coupled to a rotor 108 fixed to the drive shaft 106 via a connecting portion 109 so that an inclination angle with respect to the drive shaft can be changed.
- a coil spring 110 is disposed between the rotor 108 and the swash plate 107 to urge the swash plate 107 toward the minimum inclination angle, and on the opposite side of the swash plate 107, the inclination angle of the swash plate 107 increases.
- a coil spring 111 is arranged to urge toward.
- One end of the drive shaft 106 extends through the boss portion 102a protruding outside the front housing 102 to the outside of the boss portion, and is connected to a power transmission device (not shown).
- a shaft seal device 112 is inserted between the drive shaft 106 and the boss portion 102a to block the inside and the outside of the crank chamber 105 from each other.
- the drive shaft 106 is supported in the radial direction and the thrust direction by bearings 113, 114, 115, and 116, and rotates in synchronization with a power transmission device to which power is transmitted from an external drive source.
- a piston 117 is disposed in the cylinder bore 101a.
- An outer peripheral edge portion of the swash plate 107 is accommodated in a recess 117a at one end of the piston 117, and the piston 117 and the swash plate 107 are mutually connected via a shoe 118. Interlocked. Accordingly, the piston 117 reciprocates in the cylinder bore 101a by the rotation of the drive shaft 106.
- a suction chamber 119 and a discharge chamber 120 are defined in the cylinder head 104.
- the suction chamber 119 communicates with the cylinder bore 101a via a communication hole 103a provided in the valve plate 103 and a suction valve (not shown), and the discharge chamber 120 communicates with a discharge hole (not shown) and a communication hole 103b provided in the valve plate 103.
- the cylinder head 104 is fastened by a plurality of through bolts 140 to form a compressor housing.
- a muffler 121 is provided on the cylinder block 101.
- the muffler 121 is formed by joining a lid member 122 and an annular wall 101b formed on the outer peripheral surface of the cylinder block 101 via a seal member (not shown).
- a check valve 200 is disposed in the muffler space 123.
- the check valve 200 is disposed at a connection portion between the discharge passage 124 and the muffler space 123 and operates in response to a pressure difference between the discharge passage 124 (upstream side) and the muffler space 123 (downstream side). When it is smaller than the predetermined value, the discharge passage 124 is shut off, and when the pressure difference is larger than the predetermined value, the discharge passage 124 is opened.
- the discharge chamber 120 is connected to the high-pressure side refrigerant circuit of the air conditioner system through the discharge passage 124, the check valve 200, the muffler space 123, and the discharge port 122a.
- the cylinder head 104 is formed with a suction port 104a connected to the low-pressure refrigerant circuit of the air conditioner system, and the suction port 104a is connected to the suction chamber 119 via a suction passage 104b.
- the cylinder head 104 is provided with a control valve 300.
- the control valve 300 adjusts the opening degree of the first communication passage 125 between the discharge chamber 120 and the crank chamber 105 and controls the amount of discharge gas introduced into the crank chamber 105.
- the refrigerant in the crank chamber 105 passes through the gaps between the bearings 115 and 116 and the drive shaft 106, passes through the chamber 127 and the second communication path 128 passing through the fixed orifice 103 c provided in the valve plate 103, and enters the suction chamber 119. Flowing.
- the discharge capacity can be controlled by adjusting the discharge gas introduction amount into the crank chamber 105 by the control valve 300 to change the pressure of the crank chamber 105 and changing the inclination angle of the swash plate 107, that is, the stroke of the piston 117. it can.
- the control valve 300 is an external control type control valve that operates in response to an external signal.
- the control valve 300 senses the pressure in the suction chamber 119 via the communication path 126 and adjusts the energization amount to the solenoid unit of the control valve 300 to thereby obtain a predetermined value.
- the discharge capacity is controlled so that the pressure of the suction chamber 119 becomes the same.
- the control valve 300 includes a valve unit 300A and a solenoid unit 300B.
- the valve unit 300A includes a valve housing 310, a valve body 320, a spring 330 that biases the valve body 320 in the valve closing direction, and an adjustment member 340 that adjusts the biasing force of the spring.
- a chamber 310a in which the valve portion 320a of the valve body 320 is disposed is formed inside the valve housing 310, and the chamber 310a communicates with the discharge chamber 120 via the communication hole 310b and the upstream portion of the first communication path 125. ing.
- a chamber 310c is formed adjacent to the chamber 310a.
- the chamber 310c communicates with the chamber 310a via the valve hole 310d, and further communicates with the crank chamber 105 via the communication hole 310e and the downstream portion of the first communication passage 125. Communicate. Therefore, the communication hole 310b, the chamber 310a, the valve hole 310d, the chamber 310c, and the communication hole 310e form a part of the first communication path 125.
- a valve seat 310f made of a funnel-shaped inclined surface is formed around the valve hole 310d.
- the valve body 320 includes a valve portion 320a, a shaft portion 320b, and a connecting portion 320c, and is formed of a nonmagnetic material.
- the valve portion 320a and the shaft portion 320b are formed in a cylindrical shape with the same outer diameter, and the outer periphery of the shaft portion 320b is slidably supported by an insertion hole 310g formed in the valve housing 310, and the end portion of the valve portion 320a is The outer peripheral corner abuts and separates from the valve seat 310f to open and close the valve hole 310d.
- the base part of the connecting part 320c is fitted and fixed to the valve part 320a and extends to the chamber 310c side, and the tip part 320c1 is connected to a pressure sensitive unit 380, which will be described later.
- the other end side (shaft portion 320 b) of the valve body 320 is accommodated in the chamber 310 h, and the chamber 310 h communicates with the suction chamber 119 via a communication hole 340 a formed in the adjustment member 340 and the communication passage 126.
- a communication hole 320d is formed inside the valve body 320, and the communication hole 320d can communicate the chamber 310h and the chamber 310c as will be described later.
- a third communication path 129 that connects the crank chamber 105 and the suction chamber 119 is formed by bypassing the communication path 128.
- the solenoid unit 300B is housed in a solenoid housing 350, a molded coil 360 housed in the solenoid housing, a bottomed cylindrical sleeve 370 fixed to the solenoid housing 350 and disposed at the center of the mold coil 360, and the sleeve 370.
- a pressure-sensitive unit 380 is configured.
- the pressure-sensitive unit 380 includes a bellows 381, an end member 382 that closes one end of the bellows, an end member 383 that closes the other end of the bellows, and a spring 384 that biases the end member 382 away from the end member 383.
- the rod 386 transmits the biasing force of the spring guide 385, the spring 384 to the end member 382, and the connecting portion 387 fixed to the end member 382.
- the end member 382 forms a movable end of the pressure-sensitive unit 380, and the end member 383 forms a fixed end.
- the end member 382 and the end member 383 are formed of a ferromagnetic material and the protruding portions 382a and 383a protruding inside the bellows 381 are opposed to each other through a predetermined gap, the end member 382 is the solenoid unit 300B.
- the movable core and the end member 383 have a function as a fixed core.
- the ferromagnetic material for example, soft iron, electromagnetic stainless steel or the like is used.
- a material of the bellows 381 for example, phosphor bronze, stainless steel or the like is used.
- the bellows 381 and the end members 382 and 383 are made of different metals, and an optimal joining method may be applied to these joints (for example, welding, brazing, soldering, adhesion, etc.).
- an optimal joining method may be applied to these joints (for example, welding, brazing, soldering, adhesion, etc.).
- the inside of the bellows 381 is held at a negative pressure.
- the rod 386 includes a large-diameter portion 386a and a small-diameter portion 386b.
- the large-diameter portion 386a is accommodated in an accommodation hole 382b formed in the end member 382, and one end of the small-diameter portion 386b is spring 384 via a spring guide 385. Is energized by. Since the end surface 386c of the large-diameter portion 386a slightly protrudes from the end surface 382c of the end member 382, when the bellows 381 contracts, the end surface 386c of the large-diameter portion 386a contacts the end surface 383b of the end member 383. A minimum gap xmin is formed between 382 and the end member 383.
- the large-diameter portion 386a is a minimum clearance regulating member that regulates the minimum clearance between the end member 382 and the end member 383 to xmin.
- the rod 386 is made of a nonmagnetic material. Even if the end member 383 and the end member 382 are magnetized, the rod 386 is not attracted to the end member 383 and the end member 382, and the bellows expands and contracts. Will not be damaged.
- the spring 384 and the spring guide 385 are accommodated in a chamber 383c inside the end member 383, and the chamber 383c is sealed by a lid member 383d.
- the chamber 383c communicates with the internal space 388 of the bellows 381 through an insertion hole 383e through which the rod 386 is inserted, and the inside of the pressure sensitive unit 380 is sealed and kept in a vacuum.
- the outer diameters of the protrusions 382a and 383a are set to the maximum values that can be accommodated inside the bellows 381 so as to maximize the magnetic pole areas of the end surface 382c and the end surface 383b.
- the sleeve 370 includes a large diameter portion 370a and a small diameter portion 370b, and an open end portion is connected to the chamber 310c.
- the pressure-sensitive unit 380 is held by the sleeve 370 by press-fitting and fixing the outer peripheral surface 383f of the end member 383 to the inner peripheral surface of the small diameter portion 370b.
- the amount of press-fitting of the end member 383 into the small-diameter portion 370b is such that when the connecting portion 387 of the pressure-sensitive unit 380 and the connecting portion 320c of the valve body 320 are in contact with each other, there is a predetermined gap between the end surface 382c and the end surface 383b.
- the gap is adjusted so that the gap between the movable core and the fixed core of the solenoid unit 300B and the expansion / contraction amount of the bellows are ensured.
- the outer peripheral surface 382d of the end member 382 is slidably supported on the inner peripheral surface of the large diameter portion 370a of the sleeve 370.
- the large diameter portion 370a is formed of a nonmagnetic material because the outer peripheral surface 382d of the end member 382 that is a ferromagnetic material slides, and the small diameter portion 370b is formed of a ferromagnetic material because the end member 383 is press-fitted and fixed. It is desirable.
- a groove 382e is formed in the outer peripheral surface 382d of the end member 382 so as to communicate the chamber 310c and the space 390 around the bellows inside the sleeve 370, and the refrigerant pressure (crank chamber) of the chamber 310c is formed around the bellows 381. Pressure) works reliably.
- the solenoid housing 350 and the plate 361 embedded in the mold coil 360 in contact with the solenoid housing 350 are formed of a ferromagnetic material. Therefore, when a current flows through the coil 362, the small diameters of the solenoid housing 350, the plate 361, and the sleeve 370 are reduced. A magnetic circuit is formed by the portion 370b, the end member 383, and the end member 382, and a force that pulls the end member 382 toward the end member 383 is generated. Therefore, the electromagnetic force generated by the solenoid unit 300B and the force due to the refrigerant pressure act in the direction of contracting the bellows 381, and the urging force of the spring 384 acts in the direction of extending the bellows 381.
- the movable end (end member 382) of the pressure-sensitive unit 380 is displaced in the expansion / contraction direction of the bellows 381 by the balance of the electromagnetic force of the solenoid unit 300B, the force due to the refrigerant pressure, and the biasing force of the spring (including the bellows itself).
- the end of the valve housing 310 of the valve unit 300A is press-fitted and fixed to the end of the solenoid housing 350 of the solenoid unit 300B, and the control valve 300 is assembled.
- valve body 320 and the pressure-sensitive unit 380 When the valve body 320 and the pressure-sensitive unit 380 are connected, the valve body 320 moves according to the expansion and contraction of the bellows 381, and the opening degree of the first communication path 125 is adjusted to flow from the discharge chamber 120 to the crank chamber 105. The refrigerant gas amount is adjusted.
- the connecting portion 387 of the pressure-sensitive unit 380 contacts and separates from the distal end portion 320c1 of the connecting portion 320c of the valve body 320 according to the expansion and contraction of the bellows 381.
- the contact portion between the connecting portion 387 and the distal end portion 320c1 of the connecting portion 320c has a valve structure.
- the third communication path 129 is blocked, and the connecting portion When 387 and the tip end portion 320c1 of the connecting portion 320c are separated from each other, the third communication path 129 is opened.
- the valve body 320 and the pressure sensing unit 380 are connected, that is, in a state where the first communication path 125 is opened, the third communication path 129 is blocked, and the crank chamber 105 and the suction chamber 119 are not connected to each other. It communicates only through the communication path 128.
- the pressure of the crank chamber 105 is adjusted by adjusting the opening degree of the valve body 320, whereby the inclination angle of the swash plate 107 is changed to control the discharge capacity. Is done.
- the valve body 320 In a state in which the bellows 381 contracts and the connecting portion 387 and the distal end portion 320c1 of the connecting portion 320c are separated from each other, the valve body 320 is urged by the spring 330 and comes into contact with the valve seat 310f, and the first communication passage 125 is The flow of the refrigerant gas from the discharge chamber 120 to the crank chamber 105 is interrupted.
- the crank chamber 105 and the suction chamber 119 communicate with each other through two passages of the second communication passage 128 and the third communication passage 129. As a result, the pressure in the crank chamber 105 becomes equal to the pressure in the suction chamber 119.
- the inclination angle of the plate 107 is maximized to obtain the maximum discharge capacity.
- the pressure (Ps) of the suction chamber 119 acts on the valve body 320 in the valve closing direction from the chamber 310h side
- the pressure (Pc) of the crank chamber 105 acts on the valve body 320 in the valve opening direction from the valve hole 310d side.
- the pressure receiving area receiving the pressure of the suction chamber 119 is Sr
- the pressure receiving area receiving the pressure of the crank chamber 105 is Sv
- the pressure of the discharge chamber 120 Pd
- the biasing force of the spring 330 is fs
- the urging force F2 generated by the solenoid unit 300B is f (I)
- the effective area of the bellows 381 is Sb
- the urging force of the bellows 381 (combining the spring characteristics of the spring 384 and the bellows itself).
- the control valve 300 senses the pressure in the suction chamber 119 and controls the discharge capacity by opening and closing the valve body 320 so that the pressure in the suction chamber 119 is determined by the electromagnetic force. You can see that As shown in FIG. 3, the control characteristic is such that the pressure in the suction chamber decreases when the amount of current supplied to the coil 362 is increased.
- the control valve 300 contracts the bellows 381 and the discharge chamber.
- valve body 320 moves in a direction to close the first communication passage 125 that communicates between the cylinder 120 and the crank chamber 105, and the pressure in the suction chamber 119 drops below a predetermined value, the bellows 381 expands and the discharge chamber 120, the crank chamber 105, The valve body 320 moves in a direction to open the first communication passage 125 that communicates with each other, thereby forming a valve mechanism that autonomously controls the pressure of the suction chamber 119 to a predetermined value.
- the pressure in the predetermined suction chamber 119 can be finely adjusted by adjusting the biasing force fs of the spring 330 by the adjusting member 340.
- the bellows 381 contracts, the valve portion 320a of the valve body 320 contacts the valve seat 310f, and the first communication path 125 is blocked.
- the connecting portion 387 and the connecting portion 320c are separated from each other, and the third communication path 129 is opened.
- the crank chamber 105 and the suction chamber 119 communicate with each other through the two passages of the second communication passage 128 and the third communication passage 129.
- the discharge capacity is almost minimized until the liquid refrigerant in the crank chamber 105 passes through the suction chamber 119.
- the crank chamber 105 and the suction chamber 119 are separated by the two passages of the second communication passage 128 and the third communication passage 129 when the control valve 300 is used. Since the communication is established, the refrigerant in the crank chamber 105 quickly flows into the suction chamber 119, and the discharge capacity increases rapidly, thereby shifting to the predetermined suction chamber 119 pressure.
- the connecting portion 387 and the connecting portion 320c are formed of a non-magnetic material, there is a risk that iron-based foreign matter may be adsorbed to the contact portion between the connecting portion 387 and the connecting portion 320c even when the end member 382 is magnetized.
- the opening / closing operation of the contact portion between the connecting portion 387 and the connecting portion 320c constituting the valve structure is not impaired.
- the components 382 and 383 of the pressure-sensitive unit 380 are components of the solenoid unit 300B, more specifically, the movable core. It can also serve as a fixed core, the structure is simplified, contributing to cost reduction, and the assembly of the control valve is facilitated.
- the spring 384 is disposed inside the end member 383, the outer diameters of the end members 382a and 383a projecting into the inner space of the bellows 381 can be increased to the limit of the inner diameter of the bellows. The magnetic pole area between the members can be effectively secured.
- the solenoid unit 300B includes a bottomed cylindrical sleeve 370 that houses the pressure-sensitive unit 380 in the center, and the outer peripheral surface of the end member 383 of the pressure-sensitive unit is press-fitted and fixed to the inner peripheral surface of the sleeve.
- the pressure-sensitive unit 380 can be fixed and supported easily, and the radial deflection of the end member 382 can be suppressed. it can.
- a groove 382e that allows the chamber 310c and the space 390 around the bellows to communicate with each other is formed on the outer peripheral surface of the end member 382, so that the crank chamber pressure Pc acts reliably around the bellows. In response to the change in the chamber pressure Pc, the bellows 381 reliably expands and contracts.
- control valve 300 since the inside of the pressure-sensitive unit 380 is held at a negative pressure, foreign matter mixed in the fluid does not enter the gap between the end member 382 and the end member 383. The expansion / contraction operation of the bellows 381 is not hindered by foreign matter.
- the control valve 300 controls the opening / closing of not only the communication passage 125 that connects the discharge chamber and the crank chamber but also the communication passage 129 that connects the crank chamber and the suction chamber, so there is no communication path that connects the crank chamber and the suction chamber. With two systems, the refrigerant in the crank chamber can quickly flow into the suction chamber.
- the swash plate type variable capacity compressor adjusts the pressure in the crank chamber by using a control valve that includes a pressure-sensitive unit that senses refrigerant pressure and a solenoid unit that changes the operating point of the pressure-sensitive unit.
- a control valve that includes a pressure-sensitive unit that senses refrigerant pressure and a solenoid unit that changes the operating point of the pressure-sensitive unit.
- the connecting portion 387 between the valve body 320 and the pressure-sensitive unit 380 constitutes a valve mechanism.
- the connecting portion 387 is formed of a nonmagnetic material, the contact portion of the connecting portion 387 is magnetically connected. The foreign material does not adhere and the contact and separation of the connecting portion 387 are not impaired by the magnetic material.
- the control valve 400 is based on the control valve 300 of FIG. 2, the movable core of the solenoid unit, the first movable core 411 constituting the movable end of the pressure-sensitive unit 410, and the first movable
- the second movable core 430 is divided into two parts, which are disposed adjacent to the core 411 and urged by a spring 420 in the valve opening direction. In a state where the coil 362 is energized, the second movable core 430 is attracted to the first movable core 411 by electromagnetic force to constitute a movable end portion of the pressure-sensitive unit, and performs the same operation as the control valve 300 in FIG. .
- a magnetic circuit is formed by the solenoid housing 350, the plate 361, the small diameter portion 370 b of the sleeve 370, the end member 383, the first movable core (end member) 411, and the second movable core 430.
- the electromagnetic force becomes zero, so that even when the bellows 381 contracts and the connecting portion 387 and the distal end portion 320c1 of the connecting portion 320c are separated from each other, the second force is applied by the biasing force of the spring 420.
- the movable core 430 is separated from the first movable core 411, and the connecting portion 387 and the tip end portion 320c1 of the connecting portion 320c come into contact with each other to move the valve body 320 and forcibly open the valve hole 310d.
- the control valve 400 is a control valve suitable for a so-called clutchless compressor, in addition to the function of the control valve 300, with the function of setting the first communication path 125 to the maximum opening while the coil 362 is demagnetized. It has become.
- a rod 440 made of a nonmagnetic material is press-fitted and fixed to the second movable core 430, and an end of the rod 440 is inserted into a guide hole 411 a formed in the first movable core 411.
- the end of the rod comes into contact with the end of the guide hole 411a, and there is a minute gap between the first movable core 411 and the second movable core 430. It is supposed to be formed.
- the second movable core 430 is not attracted to the first movable core 411, and when the coil 362 is demagnetized, the second movable core 430 is quickly separated from the first movable core 411 by the biasing force of the spring 420. it can.
- the adjustment member 450 is not formed with a communication hole communicating with the suction chamber 119 as shown in FIG. 2, and the valve housing 310 is formed with a communication hole 310 i communicating with the suction chamber 119.
- the communication hole 320c2 that communicates the communication hole 320d with the chamber 310c is formed in the connecting portion 320c. Is formed.
- the internal space (communication hole 320d) and the external space (chamber 310c) of the valve body 320 have the same pressure, and an unnecessary pressure difference does not act on the valve body 320, and the solenoid unit 300B applies an electromagnetic force.
- the valve body 320 smoothly closes.
- the spring for applying a biasing force that separates one end member from the other end member is disposed inside the other end member.
- the spring is located inside the bellows or around the bellows. It may be arranged.
- the inside of the pressure sensitive unit is a negative pressure, it may be an atmospheric pressure.
- a shim formed of a non-magnetic material may be disposed between the end member and the end member, and the thickness of the shim may be selected to restrict the minimum gap.
- the control valve of the above embodiment constitutes a third communication path that communicates the crank chamber and the suction chamber inside the control valve. As shown in FIG. 5, the valve body opens and closes the first communication path 125.
- the pressure of the suction chamber 119 may act on the pressure-sensitive unit 501.
- the valve body of the control valve controls the opening and closing of the communication path that connects the discharge chamber and the crank chamber.
- the valve body communicates the crank chamber and the suction chamber.
- the control valve may be configured to control opening and closing of the communication path.
- the connecting portion 387 of the pressure-sensitive unit 380 shown in FIG. 2D becomes the valve body 387 ′, and the valve body is formed of a nonmagnetic material.
- the control valve of FIG. 6 has a simple configuration and contributes to cost reduction.
- valve bodies 701 and 702 are arranged in a communication path that connects the discharge chamber and the crank chamber and a communication path that connects the crank chamber and the suction chamber, respectively. Interlocking control may be performed by 703.
- the valve body 701 when the valve body 701 operates in the closing direction, the valve body 702 operates in the opening direction.
- the opening area of the throttle 103c may be reduced, or the throttle 103c may be deleted.
- the pressure receiving area Sr that receives the pressure in the suction chamber 119, the pressure receiving area Sv that receives the pressure in the crank chamber 105, and the effective area Sb of the bellows may be different areas.
- the fluid is a refrigerant, the fluid may be other fluids such as water, air, and oil.
- the present invention can be widely used for control valves that control opening and closing of fluid passages.
- Variable capacity swash plate compressor 101 Cylinder block 102 Front housing 103 Valve plate 104 Cylinder head 125 First communication path 128 Second communication path 129 Third communication path 300 Control valve 300A Valve unit 300B Solenoid unit 380 Pressure sensitive unit 382, 383 End member
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Abstract
Description
本発明は上記問題に鑑みてなされたものであり、感圧ユニットがソレノイドユニット内に配設された簡素な構造の制御弁及び制御弁を備えた斜板式可変容量圧縮機を提供することを目的とする。
感圧ユニットの内部にソレノイドユニットの磁気回路が形成されるため、感圧ユニットの構成部品がソレノイドユニットの構成部品を兼ねることができ、構造が簡素化されてコスト低減に寄与するとともに、制御弁の組立が容易となる。
感圧ユニットを容易に固定支持できるとともに、可動端部の径方向の振れを抑制できる。
制御弁が開閉制御する流体通路は、吐出室とクランク室とを連通させる連通路でも良く、或いはクランク室と吸入室とを連通させる連通路でも良く、或いは前記両者でも良い。また感圧ユニットに加わる流体圧力はクランク室の圧力でも良く、或いは吸入室の圧力でも良い。
斜板式可変容量圧縮機は、冷媒圧力を感知する感圧ユニットと、感圧ユニットの動作点を変更するソレノイドユニットを備えた制御弁を使用してクランク室の圧力を調整している。本発明に係る制御弁を使用することにより、斜板式可変容量圧縮機の構造が簡素化されて製造コストが低減する。
弁体と感圧ユニットとの連結部が弁機構を構成しているが、連結部を非磁性材料で形成したので、連結部の当接部に磁性材料の異物が付着することがなく、連結部の当接、離間が磁性材料の異物によって損なわれることがない。
シリンダブロック101と、フロントハウジング102とによって画成されるクランク室105内を横断して、駆動軸106が設けられ、その長手方向中央部の周囲には、斜板107が配設されている。斜板107は、駆動軸106に固着されたロータ108と連結部109を介して結合し、駆動軸に対する傾角が変化可能となっている。ロータ108と斜板107との間には斜板107を最小傾角へ向けて付勢するコイルバネ110が配設され、また斜板107を挟んで反対側には斜板107を傾角が増大する方向へ向けて付勢するコイルバネ111が配設されている。
駆動軸106の一端は、フロントハウジング102の外側に突出したボス部102aを貫通してボス部の外まで延在し、図示しない動力伝達装置に連結されている。駆動軸106とボス部102aとの間には、軸封装置112が挿入され、クランク室105の内部と外部とを遮断している。駆動軸106はベアリング113、114、115、116によってラジアル方向及びスラスト方向に支持され、外部駆動源から動力が伝達された動力伝達装置に同期して回転する。
シリンダボア101a内には、ピストン117が配設され、ピストン117の一端のくぼみ117a内には、斜板107の外周縁部が収容され、シュー118を介して、ピストン117と斜板107とが互いに連動する。従って、駆動軸106の回転によりピストン117がシリンダボア101a内を往復動する。
フロントハウジング102、センターガスケット(図示せず)、シリンダブロック101、シリンダガスケット(図示せず)、 吸入弁形成体(図示せず)、バルブプレート103、吐出弁形成体(図示せず)、ヘッドガスケット(図示せず)、シリンダヘッド104が、複数の通しボルト140によって締結されて圧縮機ハウジングが形成される。
シリンダヘッド104には、エアコンシステムの低圧側冷媒回路に接続する吸入ポート104aが形成され、吸入ポート104aは吸入通路104bを介して吸入室119と接続している。
弁ユニット300Aは、弁ハウジング310、弁体320、弁体320を閉弁方向へ付勢するバネ330、バネの付勢力を調整する調整部材340から構成される。
弁ハウジング310内部には、弁体320の弁部320aが配設される室310aが形成され、室310aは連通孔310b及び第1連通路125の上流部分を経由して吐出室120と連通している。また室310aに隣接して室310cが形成され、室310cは弁孔310dを経由して室310aと連通し、さらに連通孔310e及び第1連通路125の下流部分を経由してクランク室105と連通している。したがって、連通孔310b、室310a、弁孔310d、室310c及び連通孔310eは第1連通路125の一部を形成している。弁孔310dの周囲には漏斗状の傾斜面から成る弁座310fが形成されている。
弁体320は弁部320a、軸部320b及び連結部320cから構成され、非磁性材料から形成されている。弁部320a、軸部320bは同一外径で円筒状に形成され、軸部320bの外周が弁ハウジング310内部に形成された挿通孔310gに摺動可能に支持され、弁部320aの端部の外周角部が弁座310fに当接、離間して弁孔310dを開閉する。連結部320cは基部が弁部320aに嵌入固定されて室310c側に延設されており、先端部320c1は後述する感圧ユニット380と接離可能に連結する。
弁体320の他端側(軸部320b)は室310hに収容され、室310hは調整部材340に形成された連通孔340a、連通路126を経由して吸入室119と連通している。弁体320の内部には連通孔320dが形成され、連通孔320dは、後述するように室310hと室310cとを連通させることが可能である。室310hと室310cとが連通孔320dを介して連通すると、第1連通路125の下流部分、連通孔310e、室310c、連通孔320d、室310h及び連通孔340a及び連通路126は、第2連通路128をバイパスしてクランク室105と吸入室119とを連通する第3連通路129を形成する。
端部部材382と端部部材383は強磁性材料で形成され、ベローズ381の内部に突出する突出部382a、383aが所定の隙間を介して対峙しているため、端部部材382はソレノイドユニット300Bの可動コア、端部部材383は固定コアとしての機能を有している。強磁性材料としては、例えば軟鉄、電磁ステンレス等が使用される。
ベローズ381の材料としては、例えば、りん青銅、ステンレス鋼等が使用される。ベローズ381と端部部材382、383は異種金属となるが、これらの接合に最適な接合方法を適用すればよい(例えば溶接、ロー付け、はんだ付け、接着等)。軟鉄、電磁ステンレス等で形成された端部部材382及び端部部材383との接合性を考慮すると、ベローズ381をステンレス系材料で形成するのが望ましい。ベローズ381の内部は負圧に保持されている。
バネ384、バネガイド385は端部部材383の内部の室383cに収容され、室383cは蓋部材383dにより密閉されている。室383cはロッド386を挿通する挿通孔383eを経由してベローズ381内部空間388と連通し、感圧ユニット380の内部は密閉されて真空に保持されている。
突出部382a、383aの外径は、端面382cと端面383bの磁極面積を最大とすべく、ベローズ381の内部に納まる最大値に設定されている。
端部部材382の外周面382dはスリーブ370の大径部370aの内周面に摺動可能に支持されている。大径部370aは強磁性体である端部部材382の外周面382dが摺動するため非磁性材料で形成し、小径部370bは端部部材383が圧入固定されるので強磁性材料で形成することが望ましい。端部部材382の外周面382dには、室310cとスリーブ370内部でベローズ周囲の空間390とを連通させる溝382eが形成されており、ベローズ381の周囲に室310c側の冷媒圧力(クランク室の圧力)が確実に作用する。溝382eは複数あっても良い。
ソレノイドユニット300Bのソレノイドハウジング350端部に、弁ユニット300Aの弁ハウジング310端部が圧入固定されて制御弁300が組み立てられる。
弁体320と感圧ユニット380とが連結することによりベローズ381の伸縮動作に応じて弁体320が移動し、第1連通路125の開度が調整されて吐出室120からクランク室105に流れる冷媒ガス量が調整される。感圧ユニット380の連結部387は、ベローズ381の伸縮に応じて弁体320の連結部320cの先端部320c1に当接、離間する。連結部387と連結部320cの先端部320c1との当接部は弁構造となっており、連結部387と連結部320cの先端部320c1が当接すると第3連通路129が遮断され、連結部387と連結部320cの先端部320c1が離間すると第3連通路129が開放される。
弁体320と感圧ユニット380とが連結している状態、つまり第1連通路125が開放されている状態では、第3連通路129は遮断され、クランク室105と吸入室119とは第2連通路128のみにより連通する。第2連通路128には固定オリフィス103cが配設されているため、弁体320の開度調整によってクランク室105の圧力が調整され、これにより斜板107の傾角が変更されて吐出容量が制御される。
F1=fs+Ps・Sr+(Sr-Sv)・Pd-Pc・Sv (1)
となる。ここでSv=Srとなるように面積が設定されているため、
F1=fs+Ps・Sr-Pc・Sv (1´)
となる。従って、弁体320の開閉方向には吐出室120の圧力Pdは作用しない。
ソレノイドユニット300Bで発生する付勢力F2は、ソレノイドユニット300Bで発生する電磁力をf(I)、ベローズ381の有効面積をSb、ベローズの付勢力(バネ384とベローズ自身のバネ特性を合成したもの)をFbとすれば
F2=f(I)+Pc・Sb―Fb (2)
したがって制御弁の動作特性式はF1+F2=0として
fs+Ps・Sr-Pc・Sv+f(I)+Pc・Sb―Fb=0 (3)
となる。ここでSb=Svとなるように面積が設定されているため、
fs+Ps・Sr+f(I)―Fb=0
したがって
Ps=-(f(I)/Sr)+(Fb-fs)/Sr (4)
となる。式(4)から、制御弁300は、吸入室119の圧力を感知して、電磁力によって決定される所定の吸入室119の圧力になるように弁体320を開閉制御して吐出容量を制御するものであることがわかる。尚図3に示すように、コイル362への通電量を増大すると吸入室の圧力が低下するような制御特性となっている。
例えばエアコン起動時に、可変容量圧縮機100のクランク室105に多量の液冷媒が停留していると、従来技術では、クランク室105の液冷媒が吸入室119に抜けるまでは吐出容量がほぼ最小に維持され、しばらくの間冷房が得られないという問題を生じたが、制御弁300を使用すると、第2連通路128と第3連通路129の2つの通路によりクランク室105と吸入室119とが連通するので、クランク室105内の冷媒が速やかに吸入室119に流れ、速やかに吐出容量が増大して所定の吸入室119の圧力へ移行するという効果が得られる。ソレノイドユニット300Bの電磁力は感圧ユニット380の可動端部(端部部材382)に直接作用しているので、ソレノイドユニット300Bの電磁力で決定される所定の吸入室の圧力になるまで第3連通路129は開放される。 この結果、最大吐出容量で動作している間は、第2連通路128と第3連通路129の2つの通路によりクランク室105と吸入室119とが連通し、クランク室105内の冷媒が速やか
に吸入室119に流れるという効果が得られる。 連結部387と連結部320cは非磁性材料で形成されているため、端部部材382が磁化されている状態でも連結部387と連結部320cとの当接部に鉄系の異物を吸着する恐れはなく、弁構造を構成している連結部387と連結部320cとの当接部の開閉動作が損なわれることはない。
制御弁300においては、バネ384を端部部材383内部に配設したため、ベローズ381の内部空間に突出している端部部材382a、383aの外径をベローズ内径ぎりぎりまで大きくすることができ、両端部部材間の磁極面積を有効に確保できる。
制御弁300においては、バネ384の付勢力を伝達する非磁性材料から形成された伝達ロッド386に、端部部材382と端部部材383との間の最小隙間を規制する規制部を設けたので、あらたな規制手段を設ける必要がなく、構造が簡素化される。
制御弁300においては、ソレノイドユニット300Bは中心部に感圧ユニット380を収容する有底筒状のスリーブ370を備え、感圧ユニットの端部部材383の外周面がスリーブ内周面に圧入固定され、感圧ユニットの端部部材382の外周面がスリーブ内周面に摺動可能に支持されるので、感圧ユニット380を容易に固定支持できるとともに、端部部材382の径方向の振れを抑制できる。
制御弁300においては、端部部材382の外周面に室310cとベローズ周囲の空間390とを連通させる溝382eが形成されているので、ベローズの周囲に確実にクランク室圧力Pcが作用し、クランク室圧力Pcの変化に応答してベローズ381が確実に伸縮動作する。
制御弁300においては、感圧ユニット380の内部を負圧に保持しているため、端部部材382と端部部材383との間の隙間に流体に混入している異物が入り込むことがなく、ベローズ381の伸縮動作が異物により阻害されることがない。
制御弁300は、吐出室とクランク室とを連通させる連通路125のみならずクランク室と吸入室とを連通させる連通路129も開閉制御するので、クランク室と吸入室とを連通させる連通路が2系統となり、クランク室内の冷媒を迅速に吸入室へ流入させることができる。
斜板式可変容量圧縮機は、冷媒圧力を感知する感圧ユニットと、感圧ユニットの動作点を変更するソレノイドユニットを備えた制御弁を使用してクランク室の圧力を調整している。制御弁300を使用することにより、制御弁の構造が簡素化されてコスト低減を実現できる。
制御弁300においては、弁体320と感圧ユニット380との連結部387が弁機構を構成しているが、連結部387を非磁性材料で形成したので、連結部387の当接部に磁性材料の異物が付着することがなく、連結部387の当接、離間が磁性材料の異物によって損なわれることがない。
コイル362に通電されている状態では、第2可動コア430は電磁力によって第1可動コア411に吸引されて感圧ユニットの可動端部を構成し、図2の制御弁300と同じ動作を行う。制御弁400では、ソレノイドハウジング350、プレート361、スリーブ370の小径部370b、端部部材383、第1可動コア(端部部材)411、第2可動コア430で磁気回路が形成される。尚制御弁400の動作特性式は以下となる。
Ps=-(f(I)/Sr)+(Fb+fs2-fs1)/Sr (5)
fs1:バネ330の付勢力、fs2:バネ420の付勢力。
調整部材450には図2に示すような吸入室119と連通する連通孔は形成されておらず、弁ハウジング310に吸入室119と連通する連通孔310iが形成されている。弁体320が調整部材450に当接して移動が規制されたとき、連通孔320dが室310c、室310hから遮断されるので、連通孔320dを室310cと連通させる連通孔320c2が連結部320cに形成されている。これによって弁体320の内部空間(連通孔320d)と外部空間(室310c)とが同圧となり、無用な圧力差が弁体320に作用せず、ソレノイドユニット300Bが電磁力を作用させたときに弁体320がスムーズに閉弁動作する。
感圧ユニットの内部は負圧としたが、大気圧としても良い。ベローズ内部において、端部部材と端部部材との間に非磁性材料から形成されるシムを配設し、シムの厚さを選択して最小隙間を規制しても良い。
上記実施例の制御弁は、制御弁内部にクランク室と吸入室とを連通する第3連通路を構成するものであるが、図5に示すように、第1連通路125を開閉する弁体500を備えるが、第3連通路を構成しない制御弁であっても良い。また図5に示すように感圧ユニット501に吸入室119の圧力が作用するようにしても良い。
図1~5の実施例では、制御弁の弁体は吐出室とクランク室とを連通する連通路を開閉制御したが、図6に示すように、弁体がクランク室と吸入室とを連通する連通路を開閉制御するように制御弁を構成しても良い。この場合、図2(d)に示す感圧ユニット380の連結部387が弁体387’となり、当該弁体は非磁性材料で形成される。弁体387’が当接する弁座320c1’が端部に形成され流体通路320d’が内部に形成された筒状の弁座形成部材320c’が弁ハウジング310に固定される。図6の制御弁は構成が簡素であり、コスト低減に寄与する。
図7に示すように、吐出室とクランク室とを連通する連通路及びクランク室と吸入室とを連通する連通路にそれぞれ弁体701、702を配設し、これらの弁体を感圧ユニット703により連動制御しても良い。図7の制御弁では、弁体701が閉じる方向に動作する時に、弁体702は開く方向に動作する。図7の制御弁を使用する場合、絞り103cの開口面積を小にしても良く、或いは絞り103cを削除しても良い。
吸入室119の圧力を受ける圧力受圧面積Sr、クランク室105の圧力を受ける圧力受 圧面積Sv、ベローズの有効面積Sbが異なる面積であっても良い。
流体を冷媒としたが、流体は、水、空気、オイル等その他の流体であっても良い。
101 シリンダブロック
102 フロントハウジング
103 バルブプレート
104 シリンダヘッド
125 第1連通路
128 第2連通路
129 第3連通路
300 制御弁
300A 弁ユニット
300B ソレノイドユニット
380 感圧ユニット
382、383 端部部材
Claims (11)
- 流体通路を開閉制御する制御弁であって、外部から流体の圧力を受けて伸縮するベローズを有する感圧ユニットと、ベローズの伸縮に応じて流体通路を開閉する弁体と、弁体に電磁力を作用させるソレノイドユニットとを備え、感圧ユニットがソレノイドユニット内に配設され、感圧ユニットは、ベローズの一端に強磁性材料で形成された可動端部を、ベローズの他端に強磁性材料で形成された固定端部を有し、ベローズの内部において、可動端部と固定端部が所定の隙間を隔てて対峙し、可動端部と固定端部がソレノイドユニットの磁気回路を形成することを特徴とする制御弁。
- ソレノイドユニットは可動コアと固定コアとを有し、感圧ユニットの可動端部が可動コアを形成し、固定端部が固定コアを形成することを特徴とする請求項1に記載の制御弁。
- 可動端部を固定端部から引き離す付勢手段を備え、付勢手段は固定端部の内部に配設されていることを特徴とする請求項1又は2に記載の制御弁。
- 固定端部の内部を貫通して可動端部に当接する非磁性材料で形成された伝達ロッドを備え、付勢手段は伝達ロッドを介して可動端部を固定端部から引き離し、伝達ロッドには可動端部と固定端部の最小隙間を規制する規制部が形成されていることを特徴とする請求項3に記載の制御弁。
- ソレノイドユニットは中心部に感圧ユニットを収容する有底筒状のスリーブを備え、固定端部の外周面がスリーブ内周面に圧入固定され、可動端部の外周面がスリーブ内周面に摺動可能に支持されることを特徴とする請求項1乃至4の何れか1項に記載の制御弁。
- 可動端部の外周面には流体通路とベローズ周囲の空間とを連通させる連通路が形成されていることを特徴とする請求項5に記載の制御弁。
- 感圧ユニットの内部は負圧に保持されていることを特徴とする請求項1乃至6の何れか1項に記載の制御弁。
- ベローズがステンレス系材料で形成されていることを特徴とする請求項1~7の何れか1項に記載の制御弁。
- 流体が斜板式可変容量圧縮機を流れる冷媒であり、流体通路が、吐出室とクランク室とを連通させる連通路とクランク室と吸入室とを連通させる連通路の何れか一方又は両方であり、流体の圧力が、クランク室の圧力又は吸入室の圧力であることを特徴とする請求項1~8の何れか1項に記載の制御弁。
- 請求項9に記載の制御弁を備えることを特徴とする斜板式可変容量圧縮機。
- ハウジング内に区画形成された吐出室と吸入室とクランク室と複数のシリンダボアと、シリンダボアに配設されたピストンと、クランク室を横断して配設された駆動軸と、傾角可変の斜板を有し駆動軸の回転をピストンの往復運動に変換する変換機構と、吐出室をクランク室に連通させる第1連通路と、第1連通路を開閉する制御弁と、クランク室を吸入室に連通させる第2連通路と、第2連通路に配設された絞りとを備え、制御弁の開度を調整してクランク室の圧力を変化させ、ピストンのストロークを調整して吸入室からシリンダボアに吸入される冷媒量を制御する斜板式可変容量圧縮機であって、制御弁は、感圧ユニットと弁体とが連結することによって、吸入室の圧力がソレノイドの電磁力で決定される所定値より高くなると、第1連通路を閉じる方向に弁体が移動し、吸入室の圧力が所定値より低下すると第1連通路を開く方向に弁体が移動して、吸入室の圧力を所定値に自律制御する弁機構を形成し、感圧ユニットと弁体との連結部は弁機構を構成し、感圧ユニットと弁体との連結部が離間することにより弁体内部を経由してクランク室を吸入室に連通させる第3連通路が形成され、感圧ユニットの可動端部には弁体と連結する連結部材が固定され、連結部材は非磁性材料で形成されていることを特徴とする請求項10に記載の斜板式可変容量圧縮機。
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JP6091503B2 (ja) * | 2012-05-24 | 2017-03-08 | イーグル工業株式会社 | 容量制御弁 |
KR101336160B1 (ko) * | 2012-08-13 | 2013-12-03 | (주)신한전기 | 가변용량압축기용 용량제어밸브 |
JP6005483B2 (ja) * | 2012-11-08 | 2016-10-12 | サンデンホールディングス株式会社 | 可変容量圧縮機 |
JP6085789B2 (ja) * | 2012-12-27 | 2017-03-01 | 株式会社テージーケー | 可変容量圧縮機用制御弁 |
JP2015034510A (ja) * | 2013-08-08 | 2015-02-19 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP6115393B2 (ja) * | 2013-08-08 | 2017-04-19 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP6127994B2 (ja) * | 2014-01-30 | 2017-05-17 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP6127999B2 (ja) * | 2014-02-03 | 2017-05-17 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP2015183615A (ja) * | 2014-03-25 | 2015-10-22 | 株式会社豊田自動織機 | 可変容量型斜板式圧縮機 |
JP6340501B2 (ja) * | 2014-06-19 | 2018-06-13 | 株式会社テージーケー | 可変容量圧縮機用制御弁 |
CN105506756B (zh) * | 2016-01-12 | 2018-04-17 | 东华大学 | 一种具有压力调节功能的锥形结构纺丝组件及纺丝箱体 |
CN105506757B (zh) * | 2016-01-12 | 2018-04-17 | 东华大学 | 一种具有压力调节功能的柱形结构纺丝组件及纺丝箱体 |
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JP5424397B2 (ja) | 2014-02-26 |
KR20120083927A (ko) | 2012-07-26 |
CN102639871A (zh) | 2012-08-15 |
JP2011117396A (ja) | 2011-06-16 |
US20120251343A1 (en) | 2012-10-04 |
CN102639871B (zh) | 2015-07-29 |
DE112010004661B4 (de) | 2017-02-02 |
DE112010004661T5 (de) | 2012-11-08 |
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