WO2023032481A1 - 圧力調整弁 - Google Patents
圧力調整弁 Download PDFInfo
- Publication number
- WO2023032481A1 WO2023032481A1 PCT/JP2022/027658 JP2022027658W WO2023032481A1 WO 2023032481 A1 WO2023032481 A1 WO 2023032481A1 JP 2022027658 W JP2022027658 W JP 2022027658W WO 2023032481 A1 WO2023032481 A1 WO 2023032481A1
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- WIPO (PCT)
- Prior art keywords
- pressure
- valve
- regulating valve
- actuator
- valve body
- Prior art date
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 111
- 239000003507 refrigerant Substances 0.000 claims abstract description 38
- 230000033001 locomotion Effects 0.000 claims abstract description 19
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- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 description 37
- 238000004378 air conditioning Methods 0.000 description 28
- 230000008020 evaporation Effects 0.000 description 23
- 230000007246 mechanism Effects 0.000 description 15
- 238000001816 cooling Methods 0.000 description 11
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- 238000005057 refrigeration Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007791 dehumidification Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
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Images
Classifications
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- 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
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
Definitions
- the present invention relates to a pressure regulating valve used in a refrigeration cycle system, and more particularly to an evaporative pressure regulating valve equipped with a pressure sensitive bellows.
- the evaporator evaporates the refrigerant and exchanges heat with the surrounding atmosphere, but when the load is small, the evaporator may be cooled excessively and frost may form. Once frost builds up, a layer of ice blocks the air flow, resulting in a sudden drop in cooling efficiency.
- This evaporator pressure control valve restricts the outlet side passage of the evaporator and keeps the pressure inside the evaporator above a certain level to prevent frost formation in the evaporator.
- a valve main body having a valve chamber communicating with the valve chamber, and a valve seat formed in the valve chamber between a closed state in which the valve is seated and an open state in which the valve is separated from the valve seat. and a pressure sensing member that biases the valve body toward the valve seat and expands and contracts according to the pressure received by the valve body from the refrigerant flowing in from the inflow passage, thereby allowing the valve body to move forward and backward.
- An outlet side pipe of the evaporator is connected to the inflow path.
- the pressure sensing member consists of a bellows and a compression coil spring provided in the bellows. (evaporation pressure in the evaporator).
- Patent Document 1 discloses such a pressure regulating valve.
- such a pressure regulating valve has the advantage of having a simple control structure in which the degree of opening of the valve is automatically (mechanically) determined and does not require a complicated control mechanism. be. This is because the bellows and coil springs that constitute the pressure sensing member and determine the valve opening characteristics inevitably have a certain amount of variation in their characteristics (expansion characteristics and spring characteristics) in manufacturing.
- the pressure sensing member may be provided with an adjusting screw for adjusting the biasing force, and it is not impossible to change the valve opening characteristics by operating this adjusting screw. This is because it is generally placed inside the valve (inside the refrigerant flow path), and although it may be operated at the time of manufacturing and shipping, it cannot be operated unless the piping is removed after it is installed in the system.
- an object of the present invention is to enable more flexible and optimal control by enabling the opening characteristics of the pressure regulating valve to be changed at any time.
- a pressure regulating valve includes a valve body having a valve chamber communicating with an inflow path for introducing a refrigerant and an outflow path for discharging the refrigerant, and formed in the valve chamber.
- a valve body that changes the flow rate of refrigerant by moving back and forth with respect to the valve seat between a closed state in which the valve is seated on the valve seat and an open state in which the valve is separated from the valve seat, and a valve body that faces the valve seat.
- a pressure sensing member that allows the valve body to move forward and backward by expanding and contracting according to the pressure received by the valve body from the refrigerant flowing in from the inflow passage; a pressure regulating valve comprising an actuator for driving said regulating means.
- the pressure regulating valve of the present invention is provided with adjusting means for adjusting the biasing force of the pressure sensing member, and the adjusting means is driven by the actuator.
- the actuator is, for example, an electric motor, preferably a stepping motor. It is also possible to use, for example, a servomotor as an actuator and provide an encoder to drive the adjustment means by feedback control, and the present invention includes such a configuration. This is because the open-loop control that does not involve the operation enables low-cost and high-precision control (load adjustment of the pressure-sensitive member).
- the adjusting means when the end of the pressure sensing member farther from the valve element is referred to as the "base end", the adjusting means is located at the base end of the pressure sensing member.
- the actuator may change the biasing force by moving the adjustment member in the direction of extension (extending or retracting) of the pressure sensitive member.
- the adjusting means have a stopper member that can be used as a starting point when stopping the movement of the adjusting member by the actuator and setting the biasing force of the pressure sensing member. This is because the valve opening characteristics (biasing force of the pressure sensing member), that is, the evaporation pressure (temperature) of the evaporator can be changed more accurately. Taking the case of using a stepping motor as an actuator, the specific description is as follows.
- the actuator (stepping motor) is driven to move the adjusting member until it is stopped by the stopper member.
- this movement operation of the adjusting member will be referred to as “initialization”
- the initialized state will be referred to as “initial state”
- the position of the adjusting member in the initial state will be referred to as “initial position”.
- the stepping motor is driven to move the adjustment member to a position where a desired biasing force (evaporation pressure/this evaporation pressure is referred to as "first evaporation pressure").
- first evaporation pressure a desired biasing force
- the distance from the initial position to the position where the desired urging force (first evaporation pressure) is obtained is measured as the number of driving pulses of the stepping motor, and the measured value (the number of pulses) is set as a set value (this set value is " (referred to as "first set value").
- a set value (this set value is referred to as a "second set value”) that provides a desired biasing force (evaporation pressure/this evaporator pressure is referred to as a "second evaporator pressure") different from the first evaporator pressure ) are measured. That is, after the initialization operation is performed again, the adjustment member is moved from the initial position until the second evaporation pressure is reached, the distance between the movements is measured as the number of drive pulses, and the measured value is saved as the second set value. do.
- the first set value and the second set value are used to control a system using the pressure regulating valve of the present invention (for example, an air conditioning system such as a car air conditioner or a room air conditioner, or a refrigeration system such as a freezer/refrigerator). If it is stored in a storage device provided in the control unit and the actuator can be driven by the control unit, the pressure in the evaporator can be changed to the first evaporating pressure and the second evaporating pressure according to the operating conditions of the system. can be set.
- an air conditioning system such as a car air conditioner or a room air conditioner
- a refrigeration system such as a freezer/refrigerator
- evaporation pressure that is, a third set value (third evaporator pressure), a fourth set value (fourth evaporator pressure), a fifth set value (fifth evaporator pressure), . . . is measured and stored, it is possible to switch the setting of the evaporator (pressure regulating valve) to three or more evaporation pressures based on three or more set values.
- the control pressure P flow rate-pressure characteristic
- the control pressure Q flow rate-pressure characteristic
- the regulating valve is designed so as to have an ideal slope of the flow rate-pressure characteristic (this is referred to as an "ideal characteristic") as indicated by the dashed line in FIG. 9 that satisfies such requirements.
- the ideal characteristics are not necessarily achieved due to variations in the dimensions and assembly accuracy of each component during assembly and manufacturing, restrictions from the manufacturing cost perspective, and deterioration of each part due to long-term use (decrease in durability). It may not be possible. Further, even if the product is shipped after adjusting the urging force of the pressure sensing member so as to achieve the ideal control pressure P1 at the reference refrigerant flow rate Q1 as shown in FIG. Since it does not always have ideal characteristics, when it is incorporated in an air conditioning system, the control pressure Px at the refrigerant flow rate Qx may deviate from the ideal value (ideal characteristics indicated by the dashed line) depending on the operating mode and indoor conditions. A situation may occur in which the optimum air conditioning control cannot be achieved due to the disconnection.
- an electromagnetic actuator can be used as the actuator.
- the adjusting means includes an adjusting member provided at the proximal end of the pressure sensing member (the end on the side farther from the valve body), and the actuator includes the adjusting member is provided with an electromagnetic actuator (solenoid) capable of generating an attractive force that attracts the pressure-sensitive member toward the valve body, and the urging force of the pressure-sensitive member to the valve body can be changed by changing the attractive force.
- the attractive force (magnetic force) of the solenoid can be changed, for example, by the magnitude of the current (drive current) supplied to the solenoid.
- the adjusting member is pulled closer to the valve body (retracting the pressure-sensitive member) by the suction force, the position of the adjusting member changes depending on the elastic force of the pressure-sensitive member (the reaction force of the biasing force on the valve body).
- the attractive force of the solenoid, and the biasing force of the pressure-sensitive member to the valve body can be changed by changing the magnitude of the attractive force of the solenoid (the magnitude of the drive current to the solenoid). I can.
- the driving current at which the pressure in the inflow path becomes the first pressure value (first evaporation pressure) is measured and set as the first set value, and the pressure in the inflow path becomes the second pressure value (second evaporation pressure).
- the pressure It becomes possible to change the setting of the regulating valve.
- the number of set values is not limited to two, and it is possible to change settings based on three or more set values (third set value, fourth set value, . . . ) when using an electric actuator. is similar to
- the pressure regulating valve according to the present invention can be configured to include a control device for changing the urging force of the pressure sensing member as described above.
- the pressure regulating valve further includes a control device that controls the actuator, and the control device includes a storage unit that stores two or more set values related to the biasing force, and the adjustment via the actuator. a control unit for driving the means, the control unit driving the adjustment means via an actuator based on the set value stored in advance in the storage unit to change the urging force of the pressure sensing member.
- the adjusting means when the end of the pressure sensing member farther from the valve body is referred to as the base end, the adjusting means includes the adjusting member provided at the base end of the pressure sensing member. wherein the two or more set values are different information relating to the position of the adjusting member in the direction of expansion and contraction of the pressure-sensitive member, and the control unit moves the adjustment member in the direction of expansion and contraction of the pressure-sensitive member via an actuator.
- the biasing force of the pressure-sensitive member may be changed by changing the
- more flexible and optimal temperature control can be achieved by enabling the valve opening characteristics of the pressure regulating valve to be changed at any time.
- FIG. 1 is a longitudinal sectional view showing an evaporating pressure regulating valve (closed state) according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view showing the evaporation pressure regulating valve (valve open state) according to the first embodiment.
- FIG. 3 is a longitudinal sectional view showing the evaporating pressure regulating valve according to the first embodiment (initial state in which the regulating member is lowered until it is stopped by the stopper member).
- FIG. 4 is a Mollier diagram showing an air-conditioning system (as an example, a state in which a building air-conditioning system is configured and is in cooling operation) provided with the evaporative pressure regulating valve according to the first embodiment.
- FIG. 1 is a longitudinal sectional view showing an evaporating pressure regulating valve (closed state) according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view showing the evaporation pressure regulating valve (valve open state) according to the first embodiment
- FIG. 5 is a Mollier diagram showing an air conditioning system (as another example, a state in which a car air conditioner is configured and is in heating and dehumidifying operation) provided with the evaporating pressure regulating valve according to the first embodiment.
- FIG. 6 is a longitudinal sectional view showing an evaporating pressure regulating valve according to a second embodiment of the present invention (valve closed state/exciting coil de-energized state/plunger displaced to the upper limit position).
- FIG. 7 is a longitudinal sectional view showing the evaporating pressure regulating valve according to the second embodiment (closed state/state in which the plunger is displaced to the lower limit position where it collides with the suction element).
- FIG. 6 is a longitudinal sectional view showing an evaporating pressure regulating valve according to a second embodiment of the present invention (valve closed state/exciting coil de-energized state/plunger displaced to the upper limit position).
- FIG. 7 is a longitudinal sectional view showing the evaporating pressure regulating valve according
- FIG. 8 shows the evaporating pressure regulating valve according to the second embodiment (the closed state/the plunger is displaced to an intermediate position between the upper limit position and the lower limit position by adjusting the supply current to the excitation coil). state).
- FIG. 9 is a diagram showing the relationship between refrigerant flow rate and control pressure in a mechanical pressure regulating valve.
- FIG. 9 is a diagram showing the relationship between the refrigerant flow rate and the control pressure in the mechanical pressure regulating valve, and explains the adjustment operation of the urging force of the pressure sensing member when the regulating valve is shipped.
- FIG. 11 is a diagram showing the relationship between the refrigerant flow rate and the control pressure in the mechanical pressure regulating valve, showing a state in which the urging force of the pressure sensing member is changed according to the present invention.
- FIG. 12 is a flow chart showing an example of processing executed by the control unit to optimally control the air conditioning of each living room in the air conditioning system provided with the regulating valves of the first embodiment.
- FIG. 1 A pressure regulating valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
- FIG. 11 the pressure regulating valve 11 according to the present embodiment (the same applies to the second embodiment described later) is provided in the outlet side pipe of the evaporator of the air conditioning system and maintains the pressure in the evaporator at a certain level or more. It is an evaporation pressure regulating valve (hereinafter sometimes simply referred to as "pressure regulating valve” or “regulating valve”).
- pressure regulating valve evaporation pressure regulating valve
- two-dimensional orthogonal coordinates representing each direction of up, down, left, and right are appropriately displayed, and the following description is based on these directions.
- an evaporating pressure regulating valve 11 has a valve chamber 13 communicating with an inflow passage 14 for introducing refrigerant and an outflow passage 15 for discharging refrigerant.
- an inflow passage 14 for introducing refrigerant
- an outflow passage 15 for discharging refrigerant.
- valve body 17 that changes the flow rate of the refrigerant by moving back and forth (up and down movement), and the pressure that the valve body 17 receives from the refrigerant flowing from the inflow passage 14 while urging the valve body 17 toward the valve seat 16
- a pressure-sensitive bellows (pressure-sensitive member/hereinafter simply referred to as “bellows”) 21 that allows the valve body 17 to move up and down by expanding and contracting according to the pressure, and a load (biasing force) of the pressure-sensitive bellows 21 on the valve body 17 ), an electric actuator 40 for vertically moving the adjusting member 24, and an upper cover 27 for closing the upper portion of the valve chamber 13 (upper surface opening 12a).
- an actuator connecting member hereinafter simply referred to as a “connecting member” 28, and a stopper member 29 that restricts (physically or mechanically stops) the downward movement of the adjusting member 24.
- valve chamber 13 is arranged in the vertical middle portion of the valve body 12 , and the inflow passage 14 communicating with the valve chamber 13 extends vertically upward from the lower surface of the valve body 12 and opens to the bottom surface of the valve chamber 13 .
- a valve seat 16 is formed at the upper edge of the inflow passage 14 where the inflow passage 14 opens to the valve chamber 13 .
- the outflow passage 15 extends horizontally (to the right in FIGS. 1 and 2) from the side surface of the valve chamber 13 and opens to the peripheral surface of the valve body 12 .
- the pressure-sensitive bellows 21 is provided with a bellows body 22 having a cylindrical shape with a bottom and no lid and having a bellows peripheral wall, and a compression coil spring 23 accommodated in a compressed state inside the bellows body 22, and a connecting plate at the lower end.
- a valve body 17 is connected via 18 .
- the upper surface of the bellows body 22 is closed by joining the adjustment member 24 . That is, the adjusting member 24 has a disc-shaped flange portion 25 and a guide shaft portion 26 that stands vertically upward from the center portion of the flange portion 25 .
- the upper surface of the main body 22 is closed.
- the upper lid 27 for closing the upper portion of the valve chamber 13 includes an upper lid body 27a fixed by screwing into the upper opening 12a of the valve body 12, and an upper lid body 27a extending horizontally outward from the upper surface of the upper lid body 27a.
- a cup-shaped member with a bottom and no lid, which has a flange portion 27b abutting on the upper surface and a connecting member accommodating hole 27c for receiving the connecting member 28 on the upper surface side of the upper lid main body 27a. has a bottom hole 27e through which the guide shaft 26 of the adjusting member 28 is vertically slidably inserted.
- a space ( This space is formed as a "stopper arrangement space").
- the connecting member 28 is a tubular member having a large-diameter hole 28a and a small-diameter hole 28b, which are through holes communicating with each other.
- the large-diameter hole 28a passes through the upper portion of the connecting member 28 and has a large diameter so that a bearing member 34, which will be described later, can be inserted from above.
- the small-diameter hole 28b passes through the lower portion of the connecting member 28 and has a small diameter.
- the upper end portion of the guide shaft portion 26 is fitted into the small diameter hole 28b from below so as to be vertically slidable.
- the upper lid 27, the connecting member 28, and the bearing member 34 are inserted into each other in a telescopic manner, so that the electric actuator 40 is installed on the upper surface of the valve body 12. As shown in FIG.
- the guide shaft portion 26 of the adjusting member 24 passes through the bottom plate portion 27d of the upper lid main body 27a from the upper portion of the valve chamber 13, passes through the stopper arrangement space S, and the upper end thereof is inserted into the small diameter hole 28b.
- the stopper member 29 is installed in the intermediate portion of the guide shaft portion 26 (the portion extending into the stopper arrangement space S).
- the stopper member 29 is a plane C-shaped ring member fixed to the guide shaft portion 26 so as to protrude horizontally (flange-like) from the outer peripheral surface of the guide shaft portion 26.
- the electric actuator 41 When the adjusting member 24 is moved downward in , it comes into contact with the upper surface of the upper lid bottom plate portion 27d (the bottom surface of the connecting member accommodating hole 27c) to physically (mechanically) stop the adjusting member 24.
- the stopper member 29 may have any shape and structure as long as it has the function of mechanically stopping the adjusting member 24 .
- the electric actuator 40 includes a stepping motor 41, a deceleration mechanism (paradox planetary gear deceleration mechanism) 54 that decelerates the rotation of the stepping motor 41, and a bellows 21 (a guide shaft of the adjustment member 24) that converts the decelerated rotational motion into linear motion. 26) and a transmission mechanism (screw feed mechanism 36). Details are as follows.
- a cylindrical can 56 with a lid (open bottom and closed top) is joined to the upper end of the connecting member 28 via a ring-shaped base plate 57 .
- a stator 42 is provided in the can 56 , and a rotor 47 is rotatably installed on the inner circumference (inner side) of the can 56 .
- the rotor 47 and stator 42 constitute the stepping motor 41 .
- a stator 42 arranged outside the can 56 includes a yoke 43 , a bobbin 44 , a coil 45 and a resin mold cover 46 .
- the rotor 47 arranged inside the can 56 is constructed by integrally connecting a cylindrical rotor member 47a made of a magnetic material and a sun gear member 48 made of a resin material.
- a shaft 38 is inserted into the central portion of the sun gear member 48 and the upper portion of the shaft 38 is supported by a support member 39 arranged inside the top portion of the can 56 .
- the sun gear 48 a of the sun gear member 48 meshes with a plurality of planetary gears 49 rotatably supported by a shaft 50 provided on a carrier 51 placed on the bottom surface of the output gear 53 .
- the upper part of the planetary gear 49 meshes with an annular ring gear (fixed internal tooth gear) 55 attached to the upper part of the cylindrical member 37 fixed to the upper part of the connecting member 28 , and the lower part of the planetary gear 49 meshes with the annular output gear 53 . It meshes with tooth gear 52 .
- the number of teeth of the ring gear 55 and the number of teeth of the internal gear 52 of the output gear 53 are slightly different. be.
- These gear mechanisms (sun gear 48a, planetary gear 49, ring gear 55, and output gear 53) constitute a reduction mechanism (paradox planetary gear reduction mechanism) 54 that reduces the rotation of the stepping motor 41 described above. .
- a cylindrical bearing member 34 is inserted into the upper portion of the connecting member 28 and fixed by crimping the connecting member 28 .
- the output gear 53 is in slidable contact with the upper surface of the bearing member 34 .
- the upper portion of a stepped cylindrical output shaft 58 is press-fitted into the center of the bottom of the output gear 53, and the lower portion of the output shaft 58 is rotatably inserted into a fitting hole 34a formed in the upper surface of the center portion of the bearing member 34. do.
- the lower end of the shaft 38 is rotatably fitted to the upper portion of the output shaft 58 .
- a female threaded portion 34b is formed at the lower center portion of the bearing member 34, and a male threaded portion 35a formed on the outer peripheral surface of the screw driving member 35 is screwed into the female threaded portion 34b.
- the bearing member 34 (female threaded portion 34b) and the screw driving member 35 (male threaded portion 35a) rotate the rotational motion supplied from the stepping motor 41 via the screw feed mechanism 36, that is, the reduction mechanism 54, in the vertical direction. It constitutes a transmission mechanism that converts the motion into linear motion and transmits it to the bellows 21 (the guide shaft portion 26 of the adjusting member 24).
- the output gear 53 rotates at a fixed position in the vertical direction without moving up and down.
- a flat driver-shaped plate-like portion 35b provided at the upper end portion of the member 35 is inserted to transmit the rotational motion of the output gear 53 to the screw driving member 35 side.
- the linear motion of the screw drive member 35 is applied to the guide shaft portion 26 via a ball joint 31 comprising a ball 33 and a ball seat 32 fitted in a fitting hole 26a provided in the center of the upper surface of the guide shaft portion 26. 26.
- the guide shaft portion 26 (and therefore the adjusting member 24) is guided by the small diameter hole 28b of the connecting member 28 and the bottom hole 27e of the top lid bottom plate portion 27d to move vertically.
- the operation of the regulating valve 11 according to this embodiment will be briefly described.
- the valve body 17 When the load becomes smaller than the load, the valve body 17 is pushed by the biasing force of the pressure-sensitive bellows 21 and moves toward the valve seat 16, thereby decreasing the flow rate of the refrigerant.
- the valve body 17 Conversely, when the refrigerant pressure in the evaporator becomes greater than the set load of the pressure-sensitive bellows 21 that urges the valve body 17, the valve body 17 is pushed by the refrigerant pressure in the inflow passage 14 (inside the evaporator) and the valve body 17 moves to the valve seat. 16, and the flow rate of the refrigerant increases.
- the electric actuator 40 (stepping motor 41) is driven to move the adjusting member 24 to the initial position, that is, as shown in FIG. upper surface) causes the adjustment member 24 to move downward until it stops.
- the electric actuator 40 is driven to increase the pressure in the inflow passage 14 from the initial position until the pressure reaches the first pressure value (first evaporation pressure).
- the adjustment member 24 is moved upward. During this period, the number of driving pulses of the stepping motor is counted, and the counted value (number of pulses) is stored as the first set value.
- the electric actuator 40 is driven while supplying the refrigerant (or air, etc.) to the inflow passage 14 in the same manner. until the pressure reaches a second pressure value (second evaporating pressure) different from the first pressure value (first evaporating pressure). During this period, the number of driving pulses of the stepping motor 41 is counted, and the counted value (number of pulses) is stored as the second set value.
- the first set value and the second set value obtained by the above operation are applied to a system using the regulating valve 11 of the present embodiment (for example, an air conditioning system such as a car air conditioner or a room air conditioner, or a refrigeration system such as a freezer/refrigerator). system, etc.) is stored in a storage device provided in a control unit that controls the control unit so that the electric actuator 40 can be driven, the refrigerant pressure in the evaporator can be adjusted to the first It becomes possible to set the evaporation pressure and the second evaporation pressure.
- an air conditioning system such as a car air conditioner or a room air conditioner, or a refrigeration system such as a freezer/refrigerator. system, etc.
- evaporation pressure three or more pressure values (evaporation pressure), that is, a third pressure value (third evaporation pressure), a fourth pressure value (fourth evaporation pressure), a fifth pressure value (fifth evaporation pressure ), .
- the evaporator setting can be switched to evaporate pressure.
- each set value may be an arbitrary value according to the configuration of the system, operating conditions, and the like.
- An example in which the regulating valve 11 of this embodiment is incorporated in an air conditioning system will be described later.
- each of the above set values is stored on a LIN (Local Interconnect Network) board or separately provided storage device (ROM (Read Only Memory) or It can be stored in RAM (Random Access Memory), flash memory, etc.).
- LIN Local Interconnect Network
- RAM Random Access Memory
- flash memory etc.
- FIG. 4 shows a building air conditioning system 61 equipped with the evaporative pressure regulating valve 11 according to this embodiment.
- this air-conditioning system 61 includes devices constituting a refrigerating cycle, that is, a compressor 62 that compresses a refrigerant, an outdoor heat exchanger 63 that is installed outdoors, and a first living room.
- a second pressure regulating valve 69 connected to the outlet side pipe (between the second indoor heat exchanger 65 and the compressor 62) is provided.
- the first pressure regulating valve 68 and the second pressure regulating valve 69 are both composed of the pressure regulating valve 11 according to this embodiment.
- the system 61 also includes a control unit 71 for controlling settings of the pressure regulating valves 68 and 69 (biasing force of the pressure-sensitive bellows 21), a setting storage unit (storage device) 72 storing the set values, and a pulse generator. It further includes motor drive circuits 73 and 74 for driving the electric actuator 40 (stepping motor 41). Note that the control unit 71 and the setting storage unit 72 are mounted on the control board 70 of the air conditioning system 61 .
- the setting storage unit 72 stores three (three types) of setting values, that is, standard setting values (this is referred to as a "standard value”, and a setting based on the standard value is referred to as a "standard setting”);
- a high temperature side set value for shifting to a higher temperature side than the standard setting (increasing the biasing force of the pressure-sensitive bellows 21 to increase the refrigerant pressure in the evaporator, that is, positioning the adjusting member 24 lower than the standard setting)
- the setting according to the set value is called "high temperature side setting”
- the lower temperature side than the standard setting weaken the biasing force of the pressure-sensitive bellows to lower the refrigerant pressure in the evaporator, that is, the standard setting
- a low temperature side set value (setting based on the set value is referred to as a "low temperature side setting") for shifting the adjustment member to a higher position is stored.
- FIG. 4 shows a state in which the cooling operation is performed, and the refrigerant discharged from the compressor 62 passes through the outdoor heat exchanger 63, the first expansion valve 66, the first indoor heat exchanger 64 and the first pressure regulator.
- the outdoor heat exchanger 63 functions as a condenser, and both the first indoor heat exchanger 64 and the second indoor heat exchanger 65 function as evaporators.
- the first pressure regulating valve 68 connected to the outlet side pipe of the first indoor heat exchanger 64 and the second pressure regulating valve 69 connected to the outlet side pipe of the second indoor heat exchanger 65 are both Assume that it is set as standard.
- each living room (each of the indoor heat exchangers 64 and 65) changes greatly during cooling operation in such a system, for example, the number of people in the first living room increases significantly and the first Assuming that the cooling load of the indoor heat exchanger 64 increases while the number of occupants in the second living room decreases significantly and the cooling load of the second indoor heat exchanger 65 decreases, the system 61 in FIG.
- frost formation in the second indoor heat exchanger 65 can be prevented more reliably.
- the controller 71 initializes the second pressure regulating valve 69 by driving the stepping motor 41 via the motor drive circuit 74 (moves the regulating member 24 to the initial position)
- the setting The high temperature side set value is read out from the value storage unit 72 , and a drive pulse corresponding to the high temperature side set value is sent to the second pressure regulating valve 69 via the motor drive circuit 74 to drive the stepping motor 41 .
- the adjusting member 24 moves from the initial position to the high temperature side setting position, and the second pressure regulating valve 69 is set to the high temperature side setting.
- the controller 71 initializes the first pressure regulating valve 68 by driving the stepping motor 41 via the motor drive circuit 73
- the low temperature side set value is read out from the set value storage unit 72, and the motor is driven.
- a drive pulse corresponding to the low temperature side set value is sent to the first pressure regulating valve 68 via the circuit 73 to drive the stepping motor 41 .
- the adjustment member 24 moves from the initial position to the low temperature side setting position, and the first pressure regulating valve 68 is set to the low temperature side setting.
- such a setting change by the control unit 71 is automatically performed, that is, a detection signal from a sensor (for example, a temperature sensor that detects the temperature in the living room, a motion sensor that detects the number of people in the room, etc./not shown). It may be executed automatically by the control unit 71 based on the above, or may be executed manually, that is, by an input operation from an input device (for example, a remote control device (so-called remote control) / not shown). You can do it.
- a detection signal from a sensor for example, a temperature sensor that detects the temperature in the living room, a motion sensor that detects the number of people in the room, etc./not shown.
- the heat exchanger can also be controlled (changed in settings) by the controller 71 in the same manner as the first indoor heat exchanger (first pressure regulating valve) and the second indoor heat exchanger (second pressure regulating valve). It is possible.
- FIG. 12 shows an example of a processing flow for optimally controlling the air conditioning of each living room in the air conditioning system shown in FIG.
- the standard value standard set value
- the high temperature side set value high temperature side set value
- the low temperature side the upper threshold value
- the lower threshold value the lower limit value of the temperature difference
- control unit As for the processing by the control unit, first (for example, when the power of the air conditioning system is turned on), the control unit reads the standard setting values from the setting value storage unit and sets the regulating valves of each living room to the standard settings (step S101). Next, the control unit acquires the set temperature of each living room (step S102) and acquires the actual temperature of each living room (step S103).
- the control unit compares the difference between the actual temperature and the set temperature (temperature difference) with the upper limit threshold for each room, and if the temperature difference is greater than the upper limit threshold, the room (the temperature difference is the upper limit threshold
- the regulating valve of the larger living room is changed to the low temperature side setting (step S106). For example, if the upper threshold is "3°C” and the lower threshold is “-3°C”, if the set temperature is "22°C" and the actual temperature is "26°C”, the temperature difference (+4°C) is the upper limit. Since it is greater than the threshold value (3° C.), the change to the low temperature side setting is performed by the control unit.
- step S106 the temperature difference is compared with the lower limit threshold for each room (step S105). Then, if the temperature difference is smaller than the lower limit threshold, the control valve of that room (the room whose temperature difference is smaller than the lower limit threshold) is changed to the high temperature side setting (step S107).
- the control unit will change to the high temperature side setting.
- step S107 if the temperature difference is not smaller than the lower limit threshold (there is no living room with the temperature difference smaller than the lower limit threshold), and after the setting change to the high temperature side (step S107) is completed, It returns to step S102 which acquires the preset temperature of each living room.
- the control unit repeats the above processing (steps S102 to S107) at regular time intervals (for example, every 5 minutes or 10 minutes).
- steps S102 to S107 for example, every 5 minutes or 10 minutes.
- one threshold value and set value are provided for each of the high temperature side and the low temperature side, so that the biasing force is adjusted one step each for the high temperature side and the low temperature side.
- a human sensor is used to detect the number of people in the room, that is, instead of the temperature difference, the number of people (the difference between the actual number of people in the room and the predetermined number of people in the room) is used. It is also possible to change the setting of the biasing force of the pressure bellows.
- FIG. 5 shows a car air-conditioning system 81 equipped with an evaporating pressure regulating valve according to the present embodiment.
- a first pressure regulating valve 68 and a second pressure regulating valve 69 connected to the outlet side pipe of the exterior heat exchanger 84 (between the exterior heat exchanger 84 and the compressor 62) are provided.
- both the first pressure regulating valve 68 and the second pressure regulating valve 69 are composed of the pressure regulating valve 11 according to the present embodiment, and the system 81 is a control unit for controlling the settings of the pressure regulating valves 68 and 69.
- 71 a setting storage unit 72 storing setting values, and motor drive circuits 73 and 74 including a pulse generator for driving the electric actuator 40 (stepping motor 41), as shown in FIG. It is similar to the building air conditioning system 61 .
- the control unit 71 and the setting storage unit 72 are mounted on a LIN (Local Interconnect Network) substrate 85 in this embodiment.
- the standard value, the high temperature side set value, and the low temperature side set value are stored in advance in the setting storage unit, and both the first pressure regulating valve 68 and the second pressure regulating valve 69 are initially set to the standard setting. It is assumed that
- Refrigerant discharged from the compressor 62 passes through the first vehicle interior heat exchanger 82, the first expansion valve 66, the second vehicle interior heat exchanger 83, and the first pressure regulating valve 68 in order, and then flows through the compressor 62. and a route returning to the compressor 62 via the first vehicle interior heat exchanger 82, the second expansion valve 67, the exterior heat exchanger 84, and the second pressure regulating valve 69 in this order.
- the vehicle interior heat exchanger 82 functions as a condenser
- both the second vehicle interior heat exchanger 83 and the vehicle exterior heat exchanger 84 function as evaporators.
- the second vehicle interior heat exchanger 83 functioning as an evaporator exhibits a dehumidifying function by being arranged in the airflow route of the hot air heated by heat exchange in the first vehicle interior heat exchanger 82. is.
- the controller 71 initializes the first pressure regulating valve by driving the stepping motor 41 via the motor drive circuit 73 (moves the regulating member 24 to the initial position)
- the set value is stored.
- the low temperature side set value is read out from the unit 72 , and a drive pulse corresponding to the low temperature side set value is sent to the first pressure regulating valve 68 via the motor drive circuit 73 to drive the stepping motor 41 .
- the adjustment member 24 moves from the initial position to the low temperature side setting position, and the first pressure regulating valve 68 is set to the low temperature side setting.
- the control unit 71 initializes the second pressure regulating valve by driving the stepping motor 41 through the motor drive circuit 74
- the high temperature side set value is read from the set value storage unit 72, and the motor drive circuit 74 to drive the stepping motor 41 by sending a driving pulse corresponding to the high temperature side set value to the second pressure regulating valve 69 via .
- the adjusting member 24 moves from the initial position to the high temperature side setting position, and the second pressure regulating valve 69 is set to the high temperature side setting.
- FIG. 6 to 8 A pressure regulating valve according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8.
- a regulating valve 91 of this embodiment includes a valve body 12, a valve body 17, and a pressure-sensitive bellows 21 similar to the regulating valve 11 of the first embodiment. Although it has a seat 16, an inflow channel 14 and an outflow channel 15, an electromagnetic actuator 92 is used as an actuator for displacing the adjusting member 24 instead of an electric actuator.
- the same reference numerals are given to the same configurations as those of the regulating valve 11 of the first embodiment, redundant explanations will be omitted, and differences will be mainly described.
- the electromagnetic actuator 92 connects a solenoid 93, a plunger (movable iron core) 97, the plunger 97 and the adjustment member 24, and controls the vertical movement of the plunger 97 via a ball joint 31 (a ball 33 and a ball seat 32) to the adjustment member. 24 and a thrust transmission member 98 .
- the solenoid 97 has an exciting coil 96 and an attractor (stationary iron core) 95 that attracts the plunger 97 .
- the exciting coil 96 has a bobbin 94 having a cylindrical portion at its center. Deploy.
- the suction element 95 is composed of a cylindrical suction element main body 95a that attracts the plunger 97 and a disk-shaped upper lid section 95b that closes the upper portion of the valve chamber 13.
- the suction element main body 95a and the upper lid section 95b are integrated. formed.
- the upper cover portion 95b is fixed to the valve main body 12 by screwing it into the upper surface opening 12a of the valve main body 12 in the same manner as the upper cover 27 of the first embodiment, whereby the upper portion of the valve chamber 13 is closed.
- a vertically extending through hole 95c is formed in the central portion of the suction element 95, and a thrust transmission member 98 is fitted in the upper portion of the through hole 95c so as to be slidable in the vertical direction. inserts the guide shaft portion 26 of the adjusting member 24 so as to be vertically slidable. Further, a ball joint 31 consisting of a ball 33 and a ball seat 32 is interposed between the thrust transmission member 98 and the guide shaft portion 26 so that downward thrust of the thrust transmission member 98 due to the downward movement of the plunger 97 is applied to the guide shaft.
- the upward elastic force of the pressure-sensitive bellows 21 (the reaction force of the biasing force on the valve body 17) and the upward movement of the guide shaft part 26 accompanying the upward movement of the valve body 17.
- the force is adapted to be transmitted to the thrust transmission member 98 .
- the regulating valve 91 of this embodiment has the same regulating member 24 as in the first embodiment on the upper surface of the bellows 21, but does not have a stopper member on the guide shaft portion 26.
- the stop position of the plunger 97 that is, the position of the adjusting member 24 in the vertical direction, depends on the upward elastic force of the pressure-sensitive bellows 21 (the reaction force of the biasing force on the valve body 17) and the solenoid 93 (attractor). 95) (the magnitude of the driving current supplied to the solenoid 93). That is, if the attractive force (strength of magnetic force) of the attractor 95 is sufficiently large, the plunger 97 descends to the lower limit position where it collides with the attractor as shown in FIG. If the suction force of the suction element 95 is weakened by adjustment, the plunger 97 (adjustment member 24) can be stopped at any intermediate position between the upper limit position shown in FIG. 6 and the lower limit position shown in FIG. (See FIG. 8).
- the magnitude of the driving current that makes the pressure in the inflow passage 14 become the first pressure value (first evaporating pressure) is measured and set as the first set value.
- the magnitude of the drive current at which the internal pressure becomes the second pressure value (second evaporation pressure) is measured and set as the second set value, and these first set value and second set value are set for the system (air conditioning system, etc.). If the values are stored in the value storage unit and made available to the control unit, the setting of the pressure regulating valve 91 can be performed by changing the magnitude of the current supplied to the excitation coil 96 by the control unit based on each set value. Changes can be made.
- the number of set values is not limited to two, and setting changes can be made based on three or more set values (third set value, fourth set value, . . . ), which is the same as in the first embodiment. It is the same.
- initialization is performed by bringing the stopper member 29 into contact with the bottom surface of the connecting member housing hole 27c (upper surface of the top lid bottom plate portion 27d). Since the object can be achieved if it is possible, the place where the stopper member 29 abuts may be another place (another member or part) in the regulating valve.
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Abstract
Description
図1から図5を参照して本発明の第1の実施形態に係る圧力調整弁について説明する。なお、本実施形態(後述の第2実施形態についても同様)に係る圧力調整弁11は、空調システムの蒸発器の出口側配管に備えられて蒸発器内の圧力を一定の大きさ以上に保持する蒸発圧力調整弁(以下、単に「圧力調整弁」又は「調整弁」と称することがある)である。また、各図には上下左右の各方向を表す二次元直交座標を適宜表示し、以下の説明はこれらの方向に基いて行う。
図6から図8を参照して本発明の第2の実施形態に係る圧力調整弁について説明する。図6から図8に示すように本実施形態の調整弁91は、前記第1実施形態の調整弁11と同様の弁本体12、弁体17および感圧ベローズ21を備え、弁室13、弁座16、流入路14および流出路15を有するものであるが、調節部材24を変位させるアクチュエータとして電動アクチュエータに代え、電磁アクチュエータ92を使用する。以下、第1実施形態の調整弁11と同様の構成については同一の符号を付して重複した説明を省略し、相違点を中心に述べる。
12 弁本体
12a 上面開口
13 弁室
14 流入路
15 流出路
16 弁座
17 弁体
18 連結板
21 感圧ベローズ
22 ベローズ本体
23 圧縮コイルばね
24 調節部材
25 フランジ部
26 案内軸部
26a 嵌合穴
27 上蓋
27a 上蓋本体
27b フランジ部
27c 連結部材収容穴
27d 上蓋底板部
27e 底孔
28 アクチュエータ連結部材
28a 大径孔
28b 小径孔
29 ストッパ部材
31 ボール状継手
32 ボール受座
33 ボール
34 軸受部材
34a 嵌挿穴
34b 雌ねじ部
35 ねじ駆動部材
35a 雄ねじ部
35b 板状部
36 ねじ送り機構
37 円筒部材
38 シャフト
39 支持部材
40 電動アクチュエータ
41 ステッピングモータ
42 ステータ
43 ヨーク
44 ボビン
45 コイル
46 樹脂モールドカバー
47 ロータ
47a ロータ部材
48 太陽ギヤ部材
48a 太陽ギヤ
49 遊星ギヤ
50 シャフト
51 キャリア
52 内歯ギヤ
53 出力ギヤ
54 減速機構(不思議遊星歯車減速機構)
55 リングギヤ(内歯固定ギヤ)
56 キャン
57 ベースプレート
58 出力軸
58a 嵌合溝
61 ビル空調システム
62 圧縮機
63 室外熱交換器
64 第1室内熱交換器
65 第2室内熱交換器
66 第1膨張弁
67 第2膨張弁
68 第1圧力調整弁
69 第2圧力調整弁
70 制御基板
71 制御部
72 設定記憶部(記憶装置)
73,74 モータ駆動回路
81 カーエアコンシステム
82 第1車室内熱交換器
83 第2車室内熱交換器
84 車室外熱交換器
85 LIN基板
92 電磁アクチュエータ
93 ソレノイド
94 ボビン
95 吸引子
95a 吸引子本体部
95b 上蓋部
95c 貫通孔
96 励磁コイル
97 プランジャ(可動鉄心)
98 推力伝達部材
99 スリーブ
S ストッパ配置空間
Claims (8)
- 冷媒を導入する流入路と前記冷媒を排出する流出路とに連通する弁室を有する弁本体と、
前記弁室内に形成した弁座に着座した閉弁状態と前記弁座から離間した開弁状態との間で前記弁座に対して進退動することにより前記冷媒の流量を変更する弁体と、
前記弁体を前記弁座に向けて付勢するとともに前記流入路から流入する冷媒から前記弁体が受ける圧力に従って伸縮することにより前記弁体の進退動を許容する感圧部材と、
前記感圧部材の前記弁体に対する付勢力を調節する調節手段と
を備えた圧力調整弁であって、
前記調節手段を駆動するアクチュエータを備えた
ことを特徴とする圧力調整弁。 - 前記感圧部材の両端部のうち前記弁体から遠い側の端部を基端部と称するときに、
前記調節手段は、前記感圧部材の基端部に備えられた調節部材を含み、
前記アクチュエータは、当該調節部材を前記感圧部材の伸縮方向に移動させることにより前記付勢力を変更する
請求項1に記載の圧力調整弁。 - 前記アクチュエータは、電動機である
請求項1または2に記載の圧力調整弁。 - 前記電動機は、ステッピングモータである
請求項3に記載の圧力調整弁。 - 前記調節手段は、前記アクチュエータによる前記調節部材の移動を停止させ、前記付勢力を設定するときに起点とすることが可能なストッパ部材を備えている
請求項2から4のいずれか一項に記載の圧力調整弁。 - 前記感圧部材の両端部のうち前記弁体から遠い側の端部を基端部と称するときに、
前記調節手段は、前記感圧部材の基端部に備えられた調節部材を含み、
前記アクチュエータは、当該調節部材を前記弁体に近づける方向に引き付ける吸引力を発生可能な電磁アクチュエータであり、
前記吸引力を変えることにより前記付勢力を変更可能とした
請求項1に記載の圧力調整弁。 - 前記アクチュエータを制御する制御装置をさらに備え、
当該制御装置は、
前記付勢力に関する2以上の設定値を記憶する記憶部と、
前記アクチュエータを介して前記調節手段を駆動する制御部と
を備え、
前記制御部は、前記記憶部に予め格納された前記設定値に基いて前記アクチュエータを介して前記調節手段を駆動し、前記感圧部材の付勢力を変更する
請求項1から6のいずれか一項に記載の圧力調整弁。 - 前記感圧部材の両端部のうち前記弁体から遠い側の端部を基端部と称するときに、
前記調節手段は、前記感圧部材の基端部に備えられた調節部材を含み、
前記2以上の設定値は、互いに異なる、前記感圧部材の伸縮方向についての前記調節部材の位置に関する情報であり、
前記制御部は、前記アクチュエータを介して前記調節部材を前記感圧部材の伸縮方向に移動させることにより前記付勢力を変更する
請求項7に記載の圧力調整弁。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5416760A (en) * | 1977-07-06 | 1979-02-07 | Okawa Yoshikatsu | Electric vapor pressure regulating valve |
JPH0325264A (ja) * | 1989-06-23 | 1991-02-04 | Hitachi Ltd | 圧力感応型の弁駆動機構及びこれを用いた冷凍サイクルの圧力制御弁 |
JPH06300391A (ja) * | 1993-04-09 | 1994-10-28 | Nippondenso Co Ltd | 蒸発圧力調整弁 |
JP2015004395A (ja) | 2013-06-20 | 2015-01-08 | 株式会社不二工機 | 弁装置 |
-
2022
- 2022-07-14 CN CN202280053853.4A patent/CN117836549A/zh active Pending
- 2022-07-14 JP JP2023545139A patent/JPWO2023032481A1/ja active Pending
- 2022-07-14 WO PCT/JP2022/027658 patent/WO2023032481A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5416760A (en) * | 1977-07-06 | 1979-02-07 | Okawa Yoshikatsu | Electric vapor pressure regulating valve |
JPH0325264A (ja) * | 1989-06-23 | 1991-02-04 | Hitachi Ltd | 圧力感応型の弁駆動機構及びこれを用いた冷凍サイクルの圧力制御弁 |
JPH06300391A (ja) * | 1993-04-09 | 1994-10-28 | Nippondenso Co Ltd | 蒸発圧力調整弁 |
JP2015004395A (ja) | 2013-06-20 | 2015-01-08 | 株式会社不二工機 | 弁装置 |
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