US20150068628A1 - Capacity control valve - Google Patents

Capacity control valve Download PDF

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Publication number
US20150068628A1
US20150068628A1 US14/384,045 US201314384045A US2015068628A1 US 20150068628 A1 US20150068628 A1 US 20150068628A1 US 201314384045 A US201314384045 A US 201314384045A US 2015068628 A1 US2015068628 A1 US 2015068628A1
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US
United States
Prior art keywords
valve
bellows
chamber
capacity control
pressure
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.)
Abandoned
Application number
US14/384,045
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English (en)
Inventor
Toshiaki Iwa
Yoshihiro Ogawa
Kohei Fukudome
Kenji Moriwaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eagle Industry Co Ltd
Original Assignee
Eagle Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eagle Industry Co Ltd filed Critical Eagle Industry Co Ltd
Assigned to EAGLE INDUSTRY CO., LTD. reassignment EAGLE INDUSTRY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKUDOME, KOHEI, IWA, TOSHIAKI, MORIWAKI, KENJI, OGAWA, YOSHIHIRO
Publication of US20150068628A1 publication Critical patent/US20150068628A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves
    • F16K31/061—Sliding valves
    • F16K31/0613—Sliding valves with cylindrical slides
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/0616—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow
    • G05D16/0619—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a bellow acting directly on the obturator
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2024—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means the throttling means being a multiple-way valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/86493—Multi-way valve unit
    • Y10T137/86574—Supply and exhaust
    • Y10T137/86622—Motor-operated

Definitions

  • the present invention relates to a capacity control valve that variably controls the capacity or pressure of working fluid, and specifically to a capacity control valve that controls the discharge rate of a variable-capacity compressor, etc., used for an automobile air-conditioning system, etc., according to the pressure load.
  • a swashplate type variable-capacity compressor used for an automobile air-conditioning system comprises, for example, a rotational axis driven by the rotational force of an engine to turn; a swashplate connected to the rotational axis in a manner allowing for change in its inclination angle relative to the rotational axis; and a compression piston connected to the swashplate, wherein the inclination angle of the swashplate is changed to change the stroke of the piston and thereby control the discharge rate of refrigerant gas.
  • This inclination angle of the swashplate is continuously changed by utilizing the intake pressure in an intake chamber that takes in refrigerant gas, the discharge pressure in a discharge chamber that discharges refrigerant gas pressurized by the piston, and the control chamber pressure in a control chamber (crank chamber) that houses the swashplate, while also using a capacity control valve driven by electromagnetic force to open/close in order to control the pressure in the control chamber as deemed appropriate, thereby adjusting the balance of pressures acting upon both sides of the piston.
  • Prior Art 1 For such capacity control valve, one comprising the following, for example, is known, as shown in FIG. 4 (hereinafter referred to as “Prior Art 1”; refer to Patent Literature 1, for example): discharge-side passages 73 , 77 communicating a discharge chamber and control chamber; a first valve chamber 82 formed along the discharge-side passages; intake-side passages 71 , 72 communicating an intake chamber and the control chamber; a second valve chamber (actuation chamber) 83 formed along the intake-side passages; a valve element 81 where a first valve part 76 positioned in the first valve chamber 82 to open/close the discharge-side passages 73 , 77 undergoes reciprocating motion integrally with a second valve part 75 positioned in the second valve chamber 83 to open/close the intake-side passages 71 , 72 , and the two valve parts open/close in opposite directions; a third valve chamber (capacity chamber) 84 formed along the intake-side passages 71 , 72 at a position closer to the control
  • the capacity control valve 70 is also designed in such a way that, if a need arises during capacity control to change the control chamber pressure on the variable-capacity compressor, the discharge chamber and control chamber can be connected to allow for adjustment of the pressure in the control chamber (control chamber pressure) Pc, without having to provide a clutch mechanism on the compressor. Additionally, its constitution is such that, if the control chamber pressure Pc rises while the variable-capacity compressor is stopped, the third valve part (valve-opening connection part) 79 is separated from the valve seat body (engagement part) 80 to open the intake-side passages and thereby communicate the intake chamber and control chamber.
  • the pressure-sensitive body 78 hermetically connects one end of a metal bellows 78 A to a partition adjustment part 86 and connects the other end to the valve seat body 80 , and a coil spring 87 is housed in the bellows 78 A.
  • This bellows 78 A is made of phosphor bronze to achieve good workability, but from the viewpoint of spring property, phosphor bronze has a small yield stress as a material itself and cannot ensure a long stroke, and also a bellows made of phosphor bronze tends to undergo characteristic changes such as drop in load when an excessive pressure is applied or during use at high temperature, which makes it impossible to reduce the diameter or eliminate the coil spring 87 .
  • the thickness of the bellows must be increased and its length also increased in order to ensure long-enough stroke, meaning that a length dimension greater than the overall length of the current bellows is needed, which could result in poor formability and might also cause the bellows to project from the outer diameter dimension of the compressor because the overall length in the axial direction must be extended.
  • the diameter of the valve element 81 must be increased in order to ensure the “maximum flow rate (valve full-open flow rate)” which is an important characteristic required of a capacity control valve.
  • a control valve of simple structure comprising a pressure-sensitive unit provided in a solenoid unit be obtained by designing the pressure-sensitive unit with a movable end formed on one end of a bellows using strong magnetic material and a fixed end formed on the other end of the bellows using strong magnetic material, and by opposingly positioning the movable end and fixed end inside the bellows with a specified gap provided in between so that the movable end and fixed end form a magnetic circuit for the solenoid unit; wherein such control valve is such that the bellows is formed with stainless material by considering the joining property of the movable end and fixed end formed with strong magnetic material (hereinafter referred to as “Prior Art 2,” refer to Patent Literature 2).
  • Prior Art 2 was developed with the object of allowing the components of the pressure-sensitive unit to also function as the components of the solenoid unit because the magnetic circuit for the solenoid unit is formed in the pressure-sensitive unit, thereby simplifying the structure and helping reduce the cost, while also making it easy to assemble the control valve, and furthermore the idea of forming the bellows with stainless material is simply a way to achieve good joining property of the movable end and fixed end formed with strong magnetic material and it does not reduce the diameter of the capacity control valve, and consequently the diameter of the capacity control valve, including the outer diameter of the coil, remains large.
  • the present invention was developed to solve the problems of Prior Arts 1 and 2 mentioned above, and the object of the present invention is to provide a capacity control valve which has no internal spring positioned in the bellows of the pressure-sensitive unit and also reduces the diameter of the valve element and that of the bellows to achieve size reduction and weight reduction.
  • the capacity control valve proposed by the present invention comprises:
  • discharge-side passages communicating a discharge chamber that discharges fluid and a control chamber that controls the discharge rate of fluid
  • intake-side passages communicating an intake chamber that takes in fluid and the control chamber
  • valve element that integrally has a first valve part that opens/closes the discharge-side passages in the first valve chamber and a second valve part that opens/closes the intake-side passages in the second valve chamber, where the two valve parts open/close in opposite directions due to reciprocating motion;
  • a third valve chamber formed along the intake-side passages at a position closer to the control chamber than to the second valve chamber;
  • a pressure-sensitive body positioned in the third valve chamber to apply, by extending, a bias force in the direction of opening the first valve part, and also to contract as the surrounding pressure increases;
  • an adapter provided on the free end of the pressure-sensitive body in the extending/contracting directions, and having a circular seating surface;
  • a third valve part that moves integrally with the valve element in the third valve chamber, and has a circular engagement surface that opens/closes the intake-side passages by engaging with and separating from the seating surface of the adapter;
  • a solenoid that applies an electromagnetic drive force to the valve element in the direction of closing the first valve part
  • the pressure-sensitive body is formed by a formed bellows made of material having greater yield stress than phosphor bronze;
  • the formed bellows has its diameter set smaller and its stroke longer than the diameter and stroke of a phosphor bronze bellows.
  • the diameter of the bellows and that of the valve element can be reduced and response of the valve element can be improved, while at the same time the diameter of the valve body can be reduced.
  • the diameter of the capacity control valve containing the solenoid can be reduced and consequently the capacity control valve can be made lighter and more space-saving.
  • capacity control valve can contribute to the size reduction and weight reduction of a swashplate-type variable-capacity compressor and weight reduction of a vehicle, thus helping provide environmentally friendly products.
  • a smaller bellows diameter leads to a smaller adapter diameter, which in turn improves the vibration resistance of the bellows and also improves the vibration resistances of other movable parts as a result of reduced weights of the parts due to diameter reduction. All these can ultimately contribute to improved durability.
  • the capacity control valve proposed by the present invention is characterized in that, in the first feature, the pressure-sensitive body is preferably formed with austenitic stainless material.
  • a pressure-sensitive body having high spring property and yield stress and suitable for diameter reduction can be obtained.
  • the capacity control valve proposed by the present invention is characterized in that, in the first or second features, the adapter provided on the free end of the formed bellows and partition adjustment member provided on the fixed end are formed with non-magnetic material.
  • the capacity control valve proposed by the present invention is characterized in that, in the third feature, the partition adjustment member is preferably formed with austenitic stainless material.
  • the capacity control valve proposed by the present invention is characterized in that, in the third or fourth feature, the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and the interior of the formed bellows is kept in an absolute vacuum state.
  • the interior of the formed bellows can be kept in an absolute vacuum state by utilizing the advantages of electron beam welding, which in turn makes it possible to sense the absolute intake pressure and which thereby improves the sensing accuracy. Also because the bellows, partition adjustment member, and adapter, all formed with the same non-magnetic material, are fixed by means of electron beam welding, welding becomes easy and welding reliability can be improved.
  • the pressure-sensitive body is formed by a formed bellows made of material having greater yield stress than phosphor bronze, and the formed bellows has its diameter set smaller and its stroke longer than the diameter and stroke of a phosphor bronze bellows, and therefore the diameter of the bellows and that of the valve element can be reduced and response of the valve element can be improved and also the diameter of the valve body can be reduced. Furthermore, the diameter of the capacity control valve containing the solenoid can be reduced and consequently the capacity control valve can be made lighter and more space-saving. Eventually, such capacity control valve can contribute to the size reduction and weight reduction of a swashplate-type variable-capacity compressor and weight reduction of a vehicle, thus helping provide environmentally friendly products.
  • a smaller bellows diameter leads to a smaller adapter diameter, which in turn improves the vibration resistance of the bellows and also improves the vibration resistances of other movable parts as a result of reduced weights of the parts due to diameter reduction. All these reductions can ultimately contribute to improved durability.
  • the pressure-sensitive body is preferably formed with austenitic stainless material such that a pressure-sensitive body having high spring property and yield stress and which is suitable for diameter reduction can be obtained.
  • the adapter provided on the free end of the formed bellows and partition adjustment member provided on the fixed end are formed with non-magnetic material, and the partition adjustment member is preferably formed with austenitic stainless material, and therefore good sliding property is achieved when the pressure-sensitive body is press-fit into the valve body via the partition adjustment member, which leads to ease of manufacturing.
  • the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and the interior of the formed bellows is kept in an absolute vacuum state, and since the interior of the formed bellows can be kept in an absolute vacuum state by utilizing the advantages of electron beam welding, it becomes possible to sense the absolute intake pressure and the sensing accuracy improves as a result. Also because the bellows, partition adjustment member, and adapter, all formed with the same non-magnetic material, are fixed by means of electron beam welding, welding becomes easy and welding reliability can be improved.
  • FIG. 1 This is a schematic block diagram showing a swashplate-type variable-capacity compressor equipped with a capacity control valve conforming to the present invention.
  • FIG. 2 This is a longitudinal section view showing an overview of the capacity control valve pertaining to an embodiment of the present invention.
  • FIG. 3 These are enlarged views of pressure-sensitive bodies of capacity control valves, where (a) shows the capacity control valve pertaining to an embodiment of the present invention, while (b) shows the capacity control valve in Prior Art 1.
  • FIG. 4 This is a longitudinal section view showing an overview of the capacity control valve in Prior Art 1.
  • a swashplate-type variable-capacity compressor M comprises, for example: a casing 10 that defines a discharge chamber 11 , a control chamber (also referred to as “crank chamber”) 12 , an intake chamber 13 , multiple cylinders 14 , a port 11 b that communicates each cylinder 14 and the discharge chamber 11 and is opened/closed by a discharge valve 11 a , a port 13 b that communicates each cylinder 14 and the intake chamber 13 and is opened/closed by an intake valve 13 a , a discharge port 11 c and intake port 13 c connected to an external cooling circuit, a connection passage 15 that serves as a discharge-side passage communicating the discharge chamber 11 and control chamber 12 , a connection passage 16 that serves as the discharge-side passage and also as an intake-side passage communicating the control chamber 12 and intake chamber 13 ; and a connection passage 17 that serves as an intake-side passage, etc.; a rotational axis 20 projecting outward from inside the control chamber (crank chamber”) 12 , an intake
  • the swashplate-type variable-capacity compressor M has a connection passage 18 that directly communicates the control chamber (crank chamber) 12 and intake chamber 13 , where a fixed orifice 19 is provided in the connection passage 18 .
  • this swashplate-type variable-capacity compressor M has a cooling circuit connected to the discharge port 11 c and intake port 13 c , and a condenser 25 , expansion valve 26 , and evaporator 27 are sequentially provided in this cooling circuit.
  • the capacity control valve V comprises, for example: a valve body 30 formed with metal material or resin material; a valve element 40 positioned in the valve body 30 in a manner freely undergoing reciprocating motion; a pressure-sensitive body 50 that biases the valve element 40 in one direction; and a solenoid 60 connected to the valve body 30 and applying an electromagnetic drive force to the valve element 40 .
  • the solenoid 60 comprises, for example: a casing 62 connected to the valve body 30 ; a sleeve 63 having one end closed; a cylindrical fixed iron core 64 positioned on the interior side of the casing 62 and sleeve 63 ; a driving rod 65 forming a connection passage 44 on the interior side of the fixed iron core 64 in a manner freely undergoing reciprocating motion, with its tip connected to the valve element 40 ; a movable iron core 66 bonded to the other end of the driving rod 65 ; a coil spring 67 that biases the movable iron core 66 in the direction of opening a first valve part 41 ; and an excitation coil 68 wound on the exterior side of the sleeve 63 via a bobbin.
  • the valve body 30 comprises, for example: connection passages 31 , 32 , 33 that function as discharge-side passages; connection passages 33 , 34 that function as intake-side passages together with the connection passage 44 of the valve element 40 described later; a first valve chamber 35 formed along the discharge-side passages; a second valve chamber 36 formed along the intake-side passages; a guide passage 37 that guides the valve element 40 ; and a third valve chamber 38 formed along the discharge-side passages and intake-side passages at a position closer to the control chamber 12 . Also, a partition adjustment member 39 that defines the third valve chamber 38 and also constitutes a part of the valve body 30 is press-fit into the valve body 30 .
  • connection passage 33 and third valve chamber 38 are formed in a manner also serving as apart of the discharge-side passages and intake-side passages, while the connection passage 32 communicates the first valve chamber 35 and third valve chamber 38 and also forms a valve hole through which the valve element 40 is inserted (gaps through which fluid flows are ensured as the valve element 40 is inserted).
  • connection passages 31 , 33 , 34 are each provided in a multiple number (such as four at 90-degree intervals) and positioned radially in the circumferential direction.
  • a seating surface 35 a on which the first valve part 41 of the valve element 40 described later is seated is formed on the rim of the connection passage (valve hole) 32
  • a seating surface 36 a on which the second valve part 42 of the valve element 40 described later is seated is formed at the edge of the fixed iron core 64 described later.
  • the valve element 40 is formed in an approximate cylinder shape and comprises, for example: a first valve part 41 on one end; a second valve part 42 on the other end; a third valve part 43 connected as an add-on to a side opposite to the second valve part 42 side by sandwiching the first valve part 41 in between; and a connection passage 44 that penetrates from the second valve part 42 to the third valve part 43 in the axial direction and functions as an intake-side passage.
  • the third valve part 43 is formed in a manner flaring from a diameter-reduced state from the first valve chamber 35 toward the third valve chamber 38 and is guided through the connection passage (valve hole) 32 , and also comprises a circular engagement surface 43 a opposingly facing the adapter 53 described later on its outer periphery rim.
  • the pressure-sensitive body 50 comprises a bellows 51 , adapter 53 and partition adjustment member 39 , for example.
  • the bellows 51 is fixed on one end to the partition adjustment member 39 and retains the adapter 53 on the other end (free end).
  • the adapter 53 has a hollow cylindrical part 53 a whose tip engages with the third valve part 43 and whose cross-section has an approximate C shape, as well as a bulging part 53 c that bulges into the bellows 51 , and a circular seating surface 53 b that opposingly engages with and separates from the engagement surface 43 a of the third valve 43 is provided at the tip of the hollow cylindrical part 53 a.
  • the pressure-sensitive body 50 is positioned in the third valve chamber 38 to apply, by extending (expanding), a bias force in the direction of opening the first valve part 41 , and also to contract as the surrounding pressure (in the third valve chamber 38 and connection passage 44 of the valve element 40 ) increases, thereby actuating to weaken the bias force applied to the first valve part 41 .
  • FIG. 3 shows enlarged views of pressure-sensitive bodies of capacity control valves, where (a) shows the capacity control valve pertaining to the embodiment of the present invention, while (b) shows the capacity control valve in Prior Art 1.
  • the bellows 51 of the pressure-sensitive body 50 in the capacity control valve V pertaining to the embodiment of the present invention shown in (a) is formed by a formed bellows made of material having greater yield stress than phosphor bronze, or, for example, preferably by a formed bellows made of austenitic stainless material, where the bellows 51 has its diameter set smaller and its stroke longer than the diameter and stroke of the phosphor bronze bellows 78 A under Prior Art 1 shown in (b). Also, while the pressure-sensitive body 78 under Prior Art 1 has a coil spring 87 in the bellows 78 A, no internal spring or other such member is provided in the bellows 51 of the pressure-sensitive body 50 under the present invention.
  • the gap a between the end of the bulging part 39 a that bulges into the bellows 51 of the partition adjustment member 39 on one hand, and the end of the bulging part 53 c that bulges into the bellows 51 of the adapter 53 on the other, is set larger than the corresponding gap under Prior Art 1.
  • the partition adjustment member 39 is preferably formed with austenitic stainless material.
  • the bellows 51 , partition adjustment member 39 , and adapter 53 are fixed by means of electron beam welding and the interior of the formed bellows is kept in an absolute vacuum state.
  • the formed bellows pertaining to the embodiment of the present invention made of material having greater yield stress than phosphor bronze, has higher spring property compared to the phosphor bronze bellows and thus allows the internal spring to be eliminated and diameter B1 of the bellows 51 to be reduced, and because its yield stress itself is also high, a longer stroke can be provided. Even when the diameter of the valve element 40 is reduced, therefore, a long stroke can be provided to compensate for the smaller degree of opening of the valve element 40 , effectively permitting diameter reduction of the valve element 40 and improving the response of the valve element 40 . Because the diameter of the valve element 40 can be reduced, the diameter B2 of the valve body 30 can also be reduced.
  • the diameter B3 of the capacity control valve V containing the solenoid 60 can also be reduced, which makes the capacity control valve lighter and more space-saving.
  • This space-saving design also contributes to the size reduction and weight reduction of a swashplate-type variable-capacity compressor M and weight reduction of a vehicle, thus helping provide environmentally friendly products.
  • a smaller bellows 51 diameter leads to a smaller adapter 53 diameter, which in turn improves the vibration resistance of the bellows 51 and also improves the vibration resistances of other movable parts as a result of reduced weights of the parts due to diameter reduction. All these can ultimately contribute to improved durability.
  • valve body 30 is normally made of brass, use of phosphor bronze for the pressure-sensitive body 78 under Prior Art 1 results in the two parts having similar hardness and consequently, poor sliding property when the partition adjustment part 86 is press-fit into the valve body 30 .
  • the capacity control valve V pertaining to an embodiment of the present invention allows its partition adjustment member 39 , and adapter 53 to be formed with non-magnetic material instead of strong magnetic material as in Prior Art 2, and therefore when at least the partition adjustment member 39 is formed with austenitic stainless material, greater sliding property is achieved when the partition adjustment member 39 is press-fit into the valve body 30 because both have a different hardness, and ease of manufacturing is ensured as a result.
  • the capacity control valve V pertaining to an embodiment of the present invention is such that the bellows 51 , partition adjustment member 39 , and adapter 53 are fixed by means of electron beam welding, and by positioning the cathode in the formed bellows, the interior of the formed bellows can be kept in an absolute vacuum state when the parts are welded, and this allows for sensing of the absolute intake pressure Ps and improves the sensing accuracy compared to when the interior of the bellows is simply kept in negative pressure as is the case of Prior Art 2. Also, because the bellows 51 , partition adjustment member 39 , and adapter 53 can be formed with the same stainless material, stable production is possible by means of electron beam welding and the reliability improves as a result.
  • the aforementioned embodiment cited austenitic stainless material as a favorable material for the pressure-sensitive body because it has greater yield stress than phosphor bronze and therefore demonstrates higher spring property and yield stress and is suitable for diameter reduction.
  • the material is not at all limited to the foregoing and ferritic stainless material may be used, as well.
  • the partition adjustment member and adapter were formed with non-magnetic material, for example.
  • their material is not at all limited to the foregoing and, if the pressure-sensitive body uses ferritic stainless material, the same material may be used, as well.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Magnetically Actuated Valves (AREA)
US14/384,045 2012-05-24 2013-05-15 Capacity control valve Abandoned US20150068628A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012118385 2012-05-24
JP2012118385 2012-05-24
PCT/JP2013/063501 WO2013176012A1 (ja) 2012-05-24 2013-05-15 容量制御弁

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PCT/JP2013/063501 A-371-Of-International WO2013176012A1 (ja) 2012-05-24 2013-05-15 容量制御弁

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US15/872,781 Continuation US10077849B2 (en) 2012-05-24 2018-01-16 Capacity control valve

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US14/384,045 Abandoned US20150068628A1 (en) 2012-05-24 2013-05-15 Capacity control valve
US15/872,781 Active US10077849B2 (en) 2012-05-24 2018-01-16 Capacity control valve

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US15/872,781 Active US10077849B2 (en) 2012-05-24 2018-01-16 Capacity control valve

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EP (1) EP2857681B1 (ja)
JP (1) JP6091503B2 (ja)
WO (1) WO2013176012A1 (ja)

Cited By (28)

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CN110486503A (zh) * 2019-08-15 2019-11-22 上海汇海真空机械设备有限公司 一种真空充氮杀虫灭菌消毒设备用的专用抽真空阀
US10907624B2 (en) * 2016-09-30 2021-02-02 Fujikoki Corporation Variable-capacity compressor control valve
US11242940B2 (en) * 2017-12-27 2022-02-08 Eagle Industry Co., Ltd. Capacity control valve
US11378194B2 (en) * 2018-11-07 2022-07-05 Eagle Industry Co., Ltd. Capacity control valve
US11428332B2 (en) * 2020-12-17 2022-08-30 Delphi Technologies Ip Limited Valve assembly with anti-tip features
US11434885B2 (en) 2017-12-27 2022-09-06 Eagle Industry Co., Ltd. Capacity control valve and method for controlling same
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US11927275B2 (en) 2019-04-03 2024-03-12 Eagle Industry Co., Ltd. Capacity control valve
CN110486503A (zh) * 2019-08-15 2019-11-22 上海汇海真空机械设备有限公司 一种真空充氮杀虫灭菌消毒设备用的专用抽真空阀
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US12060870B2 (en) 2020-08-24 2024-08-13 Eagle Industry Co., Ltd. Valve
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