CN109578660B - Electric valve - Google Patents
Electric valve Download PDFInfo
- Publication number
- CN109578660B CN109578660B CN201810877531.7A CN201810877531A CN109578660B CN 109578660 B CN109578660 B CN 109578660B CN 201810877531 A CN201810877531 A CN 201810877531A CN 109578660 B CN109578660 B CN 109578660B
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- Prior art keywords
- valve
- holder
- main
- valve element
- pilot
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/44—Details of seats or valve members of double-seat valves
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/48—Attaching valve members to screw-spindles
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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
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
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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
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid 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
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
- F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve
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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
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Electrically Driven Valve-Operating Means (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Provided is an electrically operated valve which can reduce the torque required for opening the valve, improve the operability and durability, and can be further miniaturized. When the valve holder (23) is moved upward by the lifting drive device, the pilot valve body (27) and the main valve body (25) engage the valve holder (23) at different lifting amounts in the order of the pilot valve body (27) and the main valve body (25), and as a result, the valve port (11b) is opened with a time difference (stepwise) after the pressure equalizing passage (26A) is opened.
Description
Technical Field
The present invention relates to an electrically operated valve incorporated in a refrigeration cycle or the like and used for controlling the flow rate of a fluid such as a refrigerant.
Background
As such an electrically operated valve used in a refrigeration cycle or the like, for example, an electrically operated valve is known which includes: a valve core; a valve shaft that holds the valve body so as to be relatively movable in an axial direction and relatively rotatable, and that has a male screw portion; a valve core force application spring which is installed between the valve core and the valve shaft in a compression manner; a valve body provided with a guide rod having an internal thread portion screwed to the external thread portion of the valve shaft, and a valve seat that is brought into contact with and separated from the valve element; and an elevation drive mechanism including a rotor and a stator for elevating and lowering the valve shaft while rotating the valve shaft with respect to the guide rod, wherein a valve holder slidably fitted in a cylindrical portion of the guide rod is provided at a lower portion of the valve shaft, the valve body is relatively movable in an axial direction and relatively rotatably inserted in the valve holder, and the valve body is locked to a bottom portion of the valve holder in a manner preventing the valve body from coming off (for example, see patent document 1 below).
However, in recent years, in the motor-operated valve applied to the refrigeration cycle and the like as described above, it is required to be able to cope with a large diameter (large flow rate) and a high differential pressure without changing the product size.
In particular, in recent years, air conditioners and the like are required to have a large capacity, and motor-operated valves used in refrigeration cycles and the like of the air conditioners and the like are required to have a large diameter and to cope with a high differential pressure under double flow. In order to meet such a demand, a large driving torque is required during the valve opening operation, and a load capable of keeping the valve closed needs to be applied to the valve component even when a high differential pressure is generated in the reverse flow direction during the valve closing.
In order to obtain a large driving torque, it is necessary to increase the output torque of a motor as an elevation driving device, and a high-magnetic-force magnet rotor material is necessary, which may lead to an increase in size and cost of products. Further, a coil spring or the like having a large load is required for holding the closed valve under a high differential pressure, and there is a possibility that frictional resistance between the components may increase due to the load.
To solve such a problem, for example, the following patent document 2 proposes the following technique: the valve chamber is provided with two valve elements, namely a large-diameter valve element for opening and closing a large-diameter valve port and a small-diameter valve element for opening and closing a small-diameter valve port arranged in the large-diameter valve element, and the two valve elements are used for opening the small-diameter valve port and the large-diameter valve port with time difference, so that the pressure load of the large-diameter valve element is reduced, the motor is prevented from being enlarged, and the electric valve is prevented from being enlarged.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-
Patent document 2: japanese laid-open patent publication No. 8-21554
(problems to be solved by the invention)
However, in the conventional motor-operated valve described in patent document 2, a Spring (valve-closing buffer Spring) that biases the small-diameter valve element in the valve-closing direction and a Spring (Spring) that biases the large-diameter valve element in the valve-closing direction are provided, and after the small-diameter valve element is opened, the large-diameter valve element is lifted up against the bias of the Spring (Spring) that biases the large-diameter valve element in the valve-closing direction and is opened by an engagement action of an engagement member that engages with the small-diameter valve element. Therefore, when the large diameter valve element is opened, a torque for compressing the Spring (valve closing damper Spring) and the Spring (Spring) is required, and the driving torque has to be increased, and therefore, it is desired to further reduce the torque.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrically operated valve which can improve operability and durability by reducing torque required for opening the valve, and can further reduce the size of the electrically operated valve.
(means for solving the problems)
To achieve the above object, the motor-operated valve of the present invention basically comprises: a valve body having a valve chamber, an inflow port, and an outflow port, and a valve port with a valve seat being provided between the valve chamber and the outflow port; a main valve element for opening and closing the valve port; a back pressure chamber formed on a back surface of the main valve element; a pressure equalizing passage provided in the main poppet to communicate the valve port with the backpressure chamber; a pilot valve element for opening and closing the pressure equalizing passage; a biasing member that biases the pilot valve element in a valve closing direction; a valve holder that holds the main valve element and the pilot valve element so as to be relatively movable in an up-down direction; and an elevation drive device including a rotor and a stator for moving the valve holder in an elevation direction, wherein the back pressure chamber communicates with the valve chamber, and the pilot valve body and the main valve body engage with the valve holder at different ascending amounts in this order as the valve holder moves upward by the elevation drive device, thereby opening the valve port after the pressure equalizing passage is opened.
In a preferred aspect, when the valve holder is continuously moved upward from the lowermost position by the lift drive device, the pilot valve body is engaged with the valve holder by the biasing force of the biasing member while keeping the main valve body closed at the valve port, and the pilot valve body moves upward together with the valve holder to open the pressure equalizing passage.
In another preferred aspect, the valve holder has a cylindrical shape, the upper portion of the main valve element, the pilot valve element, and the biasing member are disposed in the valve holder, and the back pressure chamber is defined in the valve holder on a back surface of the main valve element.
In a more preferred aspect, the top hole of the valve holder is coupled to a valve shaft that is arranged to be movable up and down by the lift drive device.
In another preferred aspect, a washer is interposed between the valve holder and the main valve element in order to reduce rotational sliding resistance between the valve holder and the main valve element.
In another preferred aspect, the main valve element is biased in the valve closing direction by the biasing member via the pilot valve element.
In another preferred aspect, the pressure equalizing passage is formed by a vertical hole provided in the main valve element in the ascending/descending direction.
In another preferred aspect, a seating surface of the pilot valve body with respect to the pressure equalizing passage has an inverted conical surface.
(effect of the invention)
In the electrically operated valve according to the present invention, as the valve holder is moved upward by the lifting drive device, the pilot valve body and the main valve body are engaged with the valve holder at different lifting amounts in this order, and thereby the valve port is opened with a time difference (stepwise) after the pressure equalizing passage is opened, and therefore, before the valve port is opened, the pressure equalizing passage is opened and the differential pressure between the upper and lower sides of the main valve body is reduced (equalized), and the biasing member that biases the pilot valve body in the valve closing direction does not bias the main valve body when the valve port is opened, so that the drive torque is reduced, the operability and durability can be improved, and the electrically operated valve can be further downsized.
Further, since the pilot valve body has an inverted conical surface with respect to the seating surface of the pressure equalizing passage, the gradient (degree of increase) of the flow rate change after the valve is opened can be reduced, and controllability of the low flow rate control region can be improved.
Drawings
Fig. 1 is a longitudinal sectional view showing an embodiment of an electrically operated valve according to the present invention.
Fig. 2 is an enlarged vertical cross-sectional view of a main portion showing a closed valve state for explaining an operation of the motor-operated valve shown in fig. 1.
Fig. 3 is an enlarged vertical cross-sectional view of a main portion showing a state in the middle of opening a valve for explaining the operation of the motor-operated valve shown in fig. 1.
Fig. 4 is a longitudinal sectional view of a main portion showing an open state of the pressure equalizing passage for explaining an operation of the motor-operated valve shown in fig. 1.
Fig. 5 is an enlarged longitudinal cross-sectional view of a main portion showing an open state of a valve port for explaining an operation of the electric valve shown in fig. 1.
Fig. 6 is a longitudinal sectional view showing another example of the motor-operated valve shown in fig. 1.
Fig. 7 is a flow rate control characteristic diagram of the electrically operated valve shown in fig. 1 and 6.
(symbol description)
1 electric valve
6 first inlet and outlet (inflow port)
7 second inlet and outlet (outflow opening)
10 valve body
11 valve seat member
11a valve seat
11b valve port
12 valve chamber
15 guide bar
15i internal thread part
20 back pressure chamber
21 valve shaft
21e external thread part
23 valve retainer
23b inner flange-like hook portion
23c inner peripheral step part
24 valve core force spring (force component)
25 main valve core
25d outer flange-like engaging portion
26 longitudinal holes
26A voltage-sharing channel
27 pilot valve core
27b spring support
27c flange-shaped locking part
28 valve core part
29 gasket
30 rotor
35 movable stopper for valve closing direction
36 movable stopper for valve opening direction
45 casing
50 stator
55 fixed stop piece for valve closing direction
56 valve opening direction fixing stopper
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a vertical cross-sectional view showing an embodiment of an electrically operated valve according to the present invention, and fig. 2 to 5 are views for explaining the operation of the electrically operated valve shown in fig. 1.
In the present specification, the description of the position and direction such as up and down, left and right, front and back, etc. is conveniently given to the drawings in order to avoid the complication of the description, and does not necessarily refer to the position and direction in the actual state of use.
In addition, in the drawings, in order to facilitate understanding of the invention and to facilitate drawing, a gap formed between the components, a separation distance between the components, and the like may be drawn to be larger or smaller than the size of each structural component.
The motor-operated valve 1 of the illustrated embodiment includes a valve body 10, a housing 45, a guide rod 15, a valve shaft 21, a rotor 30, and a stator 50, wherein the valve body 10 is a bottomed cylindrical shape having an open upper surface, a lower end portion of the housing 45 is hermetically joined to an outer peripheral side of an upper end surface portion of the valve body 10 by welding or the like, the guide rod 15 includes a flange-like circular plate 18, the flange-like circular plate 18 is fixed to an inner peripheral side of the upper end surface portion of the valve body 10 by welding or the like, an external thread portion 21e formed on an outer periphery of a shaft-like portion 21a of the valve shaft 21 is screwed into an internal thread portion 15i formed on a small-diameter upper portion 15b of the guide rod 15, the rotor 30 is connected to and fixed to the valve shaft 21 so as to be rotatable integrally, and the stator 50 is fitted to an outer periphery of the housing 45 so as to rotationally drive the rotor 30.
Here, the rotor 30 and the stator 50 constitute a stepping motor, the female screw portion 15i of the guide lever 15 and the male screw portion 21e of the valve shaft 21 constitute a screw feed mechanism, and the stepping motor and the screw feed mechanism constitute an elevation drive device for rotating and raising the valve shaft 21 (and a valve holder 23 described later).
The valve body 10 is manufactured by press working, for example, a metal plate material, and a valve seat member 11 is fixed to a bottom portion 10b of the valve body 10 by brazing or the like, the valve seat member 11 having a valve port 11b with a valve seat 11a, and a lower portion of a guide rod 15 being inserted into an upper portion of the valve body 10. In the illustrated example, a short cylindrical vertical wall 11c is provided in the valve seat member 11 so as to stand around the valve seat 11a (i.e., around the main valve element 25 described later).
A first inlet/outlet 6 formed of a pipe joint is joined by brazing or the like to one side of a valve chamber 12 defined in the valve main body 10, and a second inlet/outlet 7 formed of a pipe joint is joined by brazing or the like to (a lower portion of) a valve seat member 11.
The valve shaft 21 includes: an upper small diameter portion 21b of a connecting body 32 externally fitted with the rotor 30; a shaft-shaped portion 21a having an external thread portion 21e to be screwed with the internal thread portion 15i of the guide rod 15; and a thick, disk-shaped lower large-diameter coupling portion 21c with a flange portion 21d on the lower side of the shaft portion 21a (male screw portion 21 e). The lower end portion of the valve shaft 21 holds a cylindrical valve holder 23, and a top hole portion of the valve holder 23 is fixedly coupled to a flange-shaped portion 21d (in the illustrated example, is fixedly caulked by a caulking portion 23 a), and the flange-shaped portion 21d is provided on the outer periphery of a lower large-diameter coupling portion 21c of the valve shaft 21, and the valve holder 23 is slidably fitted to the large-diameter cylindrical body portion 15a of the guide rod 15. That is, in this example, the top hole of the cylindrical valve holder 23 is closed by the lower large diameter coupling portion 21c of the valve shaft 21, and the valve holder 23 is lifted and lowered while rotating integrally with the valve shaft 21. The upper portion of the main valve element 25 is inserted (inserted) into the lower portion of the valve holder 23 so as to be slidable in the vertical direction (the ascending/descending direction) and is held, and the pilot valve element 27 is inserted (inserted) into the valve holder 23 so as to be slidable in the vertical direction (the ascending/descending direction) and is held on the upper side of the main valve element 25.
In this example, main valve element 25 is made of, for example, a metal material, and is made of a stepped shaft-like member arranged in the vertical direction (the axis O direction), and main valve element 25 includes: a valve body 25a having an inverted truncated cone shape, a lower portion of the valve body 25a being inserted into the valve seat 11a (valve port 11b) and seated thereon; a cylindrical body portion 25b connected to an upper portion of the valve body portion 25 a; and a large-diameter head portion 25c connected to an upper portion of the body portion 25 b.
The main valve element 25 (the large-diameter head portion 25c) is fixed to the lower end portion of the valve holder 23 so as to be prevented from coming off, and an inner flange-shaped hooking portion 23b defining a through hole into which the body portion 25b of the main valve element 25 is inserted is provided at the lower end portion of the valve holder 23 so as to protrude inward, with a gasket 29 formed of a thin annular circular plate interposed between the main valve element 25 (the large-diameter head portion 25c) and the lower end portion of the valve holder 23. When the valve holder 23 moves upward relative to the valve body 10, the washer 29 disposed on the inner flange-shaped hooking portion 23b of the valve holder 23 hooks and is locked so as to be prevented from coming off the outer flange-shaped locking portion 25d, and the outer flange-shaped locking portion 25d is formed by the outer peripheral portion of (the lower surface of) the large-diameter head portion 25c of the main valve body 25 (in other words, the downward annular land between the body portion 25b and the large-diameter head portion 25 c). The washer 29 interposed between (the inner flange-shaped hooking portion 23b of) the valve holder 23 and (the outer flange-shaped locking portion 25d of) the main valve body 25 is provided to reduce rotational sliding resistance between the valve holder 23 and the main valve body 25 (in other words, to prevent the rotational movement of the valve holder 23 by the lift driving device from being transmitted to the main valve body 25).
Further, in order to form a pressure equalizing passage (also referred to as a pilot passage) 26A that communicates the valve port 11b with the back pressure chamber 20 formed on the upper side (back surface) of the main valve body 25 (in the valve holder 23), a vertical hole 26 having a step and a smaller diameter than the valve port 11b is provided in the main valve body 25 so as to penetrate therethrough in the vertical direction (the axis O direction).
On the other hand, a substantially cylindrical pilot valve element 27 with a spring support portion 27b is placed on the upper surface of (the vertical hole 26 of) the main valve element 25. A short cylindrical valve body member 28 (in the illustrated example, fixed by caulking by a caulking portion 27 a) is held and fixed to a lower end (lower surface) of the pilot valve body 27, and the valve body member 28 is made of an elastic material such as rubber, for example, and is brought into contact with and separated from an upper end edge portion (pilot valve port) of the vertical hole 26 (pressure equalizing passage 26A) of the main valve body 25 to open and close the pressure equalizing passage 26A. Further, a flange-shaped spring support portion 27b is provided so as to protrude outward from the lower outer periphery of the pilot valve body 27, and a valve body biasing spring (biasing member) 24 made of a cylindrical compression coil spring for pressing and cushioning the valve body is mounted in a compressed state between (the upper surface of) the spring support portion 27b and (an annular recessed surface provided on the lower outer periphery of) the lower large diameter coupling portion 21c of the valve shaft 21. The pilot valve body 27 is constantly biased downward (in the valve closing direction) by the valve body biasing spring 24, and the main valve body 25 is biased downward (in the valve closing direction) via the pilot valve body 27.
An inner peripheral step portion 23c having a size to engage with the flange-like spring support portion 27b is formed on the inner periphery of the middle web portion of the valve holder 23. When the valve holder 23 moves upward with respect to the valve main body 10, the flange-shaped locking portion 27c formed by the outer peripheral portion of (the lower surface of) the spring support portion 27b of the pilot valve core 27 is hooked and locked by the inner peripheral stepped portion (upward annular land) 23c of the valve holder 23.
In this example, a plurality of through holes (horizontal holes) 23d are provided in the valve holder 23 (below the inner peripheral step portion 23 c), and the back pressure chamber 20 (inside the valve holder 23) and the valve chamber 12 are always in communication with each other through the through holes 23 d.
The valve shaft 21, the valve holder 23, the main valve element 25, the pilot valve element 27, and the valve element biasing spring 24 are lifted and lowered while being substantially integrally rotated in a state where the main valve element 25 is separated from the valve seat 11a (a valve-opened state), and the main valve element 25, the pilot valve element 27, and the valve element biasing spring 24 are relatively movable in the vertical direction (the lifting direction) and relatively rotatably held in the valve holder 23.
In this case, in the valve-closed state (the state in which the valve holder 23, the main valve element 25, and the pilot valve element 27 are at the lowermost position, the pressure equalizing passage 26A is closed, and the valve port 11b is closed) shown in fig. 1, the (lower surface of the) flange-shaped locking portion 27c of the pilot valve element 27 is separated from the inner peripheral step portion 23c (upward land) of the valve holder 23 (in the vertical direction) by a predetermined distance La, and the (lower surface of the) outer flange-shaped locking portion 25d of the main valve element 25 is separated from the (upper surface of the) washer 29 disposed on the inner flange-shaped hooking portion 23b of the valve holder 23 (in the vertical direction) by a predetermined distance Lb, and the respective separation distances are set in a relationship of Lb > La (see fig. 2). As a result, the pilot valve body 27 and the main valve body 25 engage with the valve holder 23 at different ascending amounts (positions) in the order of the pilot valve body 17 and the main valve body 25 as the valve holder 23 is moved upward by the ascending/descending drive device (described later in detail).
In order to set the origin positions of the rotor 30 and the valve shaft 21, a fixed stopper 55 for a valve closing direction having a predetermined width, height, and depth and a rectangular cross section is provided so as to protrude upward on the upper surface of the small-diameter upper portion 15b of the guide rod 15, and a fixed stopper 56 for a valve opening direction having a predetermined width, height, and depth and a rectangular cross section is provided so as to protrude downward on the upper portion of the large-diameter cylindrical body portion 15a of the guide rod 15.
The movable stopper 35 for valve closing direction is screwed to the upper end portion of the male screw portion 21e of the valve shaft 21 and is locked to the disc-shaped top portion of the rotor 30. The movable stopper 35 for valve closing direction is composed of a nut portion 35a and a stopper portion 35s, the nut portion 35a is screwed to the male screw portion 21e, and has a hexagonal outer shape and an arc-shaped side in plan view, and the stopper portion 35s is provided so as to protrude downward from the nut portion 35a, has a predetermined width, height, and depth, and has a rectangular cross section.
The movable valve-opening-direction stopper 36 that is engaged with and abuts against the fixed valve-opening-direction stopper 56 is screwed to the lower end of the male screw portion 21e of the valve shaft 21 and is locked to the lower large-diameter coupling portion 21c of the valve shaft 21. The movable stopper 36 for valve opening direction is composed of a nut portion 36a and a stopper portion 36s, the nut portion 36a is screwed to the external thread portion 21e, and the stopper portion 36s is provided to protrude upward from the nut portion 36a, has a predetermined width, height, and depth, and has a rectangular cross section.
The rotor 30 is composed of a magnet 31 having a cylindrical shape with a tip and a connecting body 32 integrally coupled to the tip, and the connecting body 32 is externally fitted to the upper small diameter portion 21b of the valve shaft 21, is placed on the movable stopper 35 for valve closing direction, and is welded and fixed to the upper small diameter portion 21 b.
Here, a recess 33 is provided on the lower surface side of the top portion of the rotor 30, the recess 33 is provided with D-cut portions formed in a D shape in a plan view at both end portions, an arc-shaped side of the nut portion 35a of the movable stopper 35 for valve closing direction is fitted in a state of contact to an arc-shaped portion other than the D-cut portion formed in the recess 33, and the other two sides of the nut portion 35a are fitted in a state of contact to the D-cut portion, whereby the rotor 30, the movable stopper 35 for valve closing direction, and the valve shaft 21 are integrally rotated and lifted.
On the other hand, a stator 50 composed of a yoke 51, a bobbin 52, a coil 53, a resin mold 54, and the like is fitted to the outer periphery of the housing 45. The stator 50 is positioned and fixed at a predetermined position with respect to the valve main body 10 by a positioning fixture (not shown) provided at the bottom thereof.
Thus, when the rotor 30 rotates, the valve shaft 21 rotates integrally with the rotor 30, and at this time, the valve shaft 21 and the valve holder 23 move up and down along with the pilot valve body 27 and the valve body 25 by the screw feed mechanism, whereby the flow rate of the refrigerant passing therethrough is adjusted.
The operation of the motor-operated valve 1 configured as described above (particularly, the valve opening operation thereof) will be specifically described with reference to fig. 2 to 5.
In addition, in the electric valve 1 of the present embodiment, although the fluid (refrigerant) flows in two directions (two directions, i.e., the direction from the first port 6 toward the second port 7 (horizontal → downward) and the direction from the second port 7 toward the first port 6 (downward → horizontal)), the operation itself of the electric valve 1 is substantially the same in the flow direction of the fluid (refrigerant), and therefore, the following description will be made by taking the case of horizontal → downward flow that can exhibit the pressure cancellation (balancing) effect as a representative example. Therefore, in the following operation, the first inlet/outlet 6 serves as an inlet (high-pressure side) and the second inlet/outlet 7 serves as an outlet (low-pressure side).
In the valve-closed state shown in fig. 2, the movable stopper 35 for valve closing direction abuts and is locked to the fixed stopper 55 for valve closing direction, and the rotor 30, the valve shaft 21, and the valve holder 23 are at the lowermost position. At this time, (the lower surface of) the flange-shaped locking portion 27c of the pilot valve element 27 is separated from the inner peripheral step portion 23c (the upward surface) of the valve holder 23 by a predetermined distance La, and (the lower surface of) the outer flange-shaped locking portion 25d of the main valve element 25 is separated from (the upper surface of) the washer 29 disposed at the inner flange-shaped hooking portion 23b of the valve holder 23 by a predetermined distance Lb (> La), and by (the urging force of) the element urging spring 24, the pilot valve element 27 is urged downward (the valve closing direction), and the main valve element 25 is urged downward (the valve closing direction) via the pilot valve element 27. Therefore, (the lower surface of the valve member 28 of) the pilot valve 27 is pressed (seated) against the upper end edge portion (pilot valve port) of the vertical hole 26 (pressure equalizing passage 26A) of the main valve 25 to close the pressure equalizing passage 26A, and (the valve body portion 25a of) the main valve 25 is pressed (seated) against the valve seat 11a of the valve main body 10 to close the valve port 11 b.
When a pulse that sets the drive mode for the valve closing direction is supplied to the stator 50 from the valve closed state shown in fig. 2, the rotor 30 and the valve shaft 21 rotate, and the rotor 30, the valve shaft 21, the valve holder 23, and the movable stopper 36 for the valve closing direction rise while rotating by the screw feed mechanism including the female screw portion 15i and the male screw portion 21 e. Until the amount of the rise thereof reaches La (the state shown in fig. 3), the flange-shaped locking portion 27c of the pilot valve core 27 is not hooked on the inner peripheral step portion 23c of the valve holder 23, and the pressure equalizing passage 26A and the valve port 11b are kept closed (the closed valve state as in fig. 2) by (the urging force of) the valve core urging spring 24. At this time, the amount of compression of the valve element biasing spring 24 gradually decreases and the entire length thereof gradually increases.
When the rotor 30, the valve shaft 21, the valve holder 23, and the movable stopper 36 for valve opening direction are further rotated and raised, and the amount of the rise reaches La, as shown in fig. 3, the flange-shaped locking portion 27c of the pilot valve body 27 is engaged with the inner peripheral step portion 23c of the valve holder 23 (by the biasing force of the valve body biasing spring 24). Until the amount of increase exceeds La and reaches Lb (the state shown in fig. 4), the pilot valve 27 moves (rises) together with the valve holder 23 (integrally) by the engagement of the flange-shaped engaging portion 27c with the inner peripheral stepped portion 23c in a state where (the valve body portion 25a of) the main valve 25 is pressed against the valve seat 11a of the valve body 10 (i.e., in a state where the main valve body 25 is kept closed with the valve port 11b) due to the difference in pressure between the upper and lower sides of the main valve body 25, and (the lower surface of the valve body member 28 of) the pilot valve 27 is separated from the upper end edge portion (the pilot valve port) of the vertical hole 26 (the pressure equalizing passage 26A) of the main valve body 25, so that the pressure equalizing passage 26A is opened. When the amount of lift exceeds La, the flange-shaped locking portion 27c engages with the inner peripheral stepped portion 23c, so that the entire length of the valve body urging spring 24 does not change. The fluid flowing from the first port (inlet port) 6 into the back pressure chamber 20 through the valve chamber 12 flows into the valve port 11b through the pressure equalizing passage 26A in the main valve element 25. The flow rate of the fluid flowing into the valve port 11b (i.e., the fluid flowing out to the second inlet/outlet (outlet) 7) gradually increases with the increase (rising amount) of the valve holder 23 and the pilot valve core 27 (small flow rate control region). In this small flow rate control region, the downward pressure (force acting in the valve closing direction) and the lift force (force acting in the valve opening direction) acting on main valve element 25 are balanced (differential pressure is cancelled).
When the rotor 30, the valve shaft 21, the valve holder 23, and the movable valve-opening-direction stopper 36 are further rotated and raised after the pressure equalizing passage 26A is opened as described above, and when the amount of the rise reaches Lb (> La), the outer flange-shaped engaging portion 25d of the main valve 25 engages with the washer 29 disposed on the inner flange-shaped hooking portion 23b of the valve holder 23, as shown in fig. 4. When the amount of increase exceeds Lb, as shown in fig. 5, the main valve element 25 moves (rises) together with the valve holder 23 (integrally) by the engagement of the outer flange-shaped locking portion 25d with the washer 29 disposed on the inner flange-shaped hooking portion 23b, and (the valve element portion 25a of) the main valve element 25 is separated from the valve seat 11a of the valve body 10, so that the valve port 11b is opened. The fluid flowing into the valve chamber 12 from the first inlet/outlet (inlet port) 6 flows into the valve port 11b (which is relatively larger in diameter than the pressure equalizing passage 26A), and the flow rate of the fluid flowing into the valve port 11b (i.e., the fluid flowing out to the second inlet/outlet (outlet port) 7) gradually increases as the valve holder 23 and the main valve element 25 rise (increase amount) (large flow rate control region). In this large flow rate control region, the downward pressure (force in the valve closing direction) and the lift force (force in the valve opening direction) acting on main valve element 25 are also balanced (differential pressure is eliminated).
Finally, the movable stopper 36 for the valve opening direction abuts and is locked to the fixed stopper 56 for the valve opening direction, whereby the rotation and the elevation of the rotor 30, the valve shaft 21, and the valve holder 23 are forcibly stopped.
As described above, in the motor-operated valve 1 of the present embodiment, as the valve holder 23 is moved upward by the elevation drive means, the pilot valve body 27 and the main valve body 25 are engaged with the valve holder 23 at different ascending amounts in this order of the pilot valve body 27 and the main valve body 25, and thereby, after the pressure equalizing passage 26A is opened, the valve port 11b is opened with a time difference (in other words, the pressure equalizing passage 26A and the valve port 11b are sequentially opened in stages), and therefore, before the valve port 11b is opened, the pressure equalizing passage 26A is opened and the differential pressure above and below the main valve body 25 is reduced (equalized), and the valve body urging spring (urging member) 24 urging the pilot valve body 27 in the valve closing direction does not urge the main valve body 25 when the valve port 11b is opened, and therefore, the drive torque is reduced, and the operability and durability can be improved, and further miniaturization of the motor-operated valve 1 can be achieved.
In the above embodiment, the lower surface (seating surface) of the valve body member 28 of the pilot valve body 27 seated on the upper end edge portion of the vertical hole 26 (pressure equalizing passage 26A) provided in the main valve body 25 is formed of a flat surface, but the pilot valve body 27 may have an inverted conical surface with respect to the seating surface 27A of the pressure equalizing passage 26A, as shown in fig. 6, for example. In the example shown in fig. 6, the seating surface 27A is formed of an inverted conical mesa having an inverted conical surface. In this case, by adjusting the inclination angle (control angle) θ of the seating surface (inverted conical surface) 27A or the like, as shown in fig. 7, for example, the gradient (degree of increase) of the flow rate change immediately after the valve is opened can be made smaller than in the above-described embodiment, and controllability of the low flow rate control region (see fig. 4) can be improved.
Claims (8)
1. An electrically operated valve, comprising:
a valve body having a valve chamber, an inflow port, and an outflow port, and a valve port with a valve seat being provided between the valve chamber and the outflow port;
a main valve element for opening and closing the valve port;
a back pressure chamber formed on a back surface of the main valve element;
a pressure equalizing passage provided in the main poppet to communicate the valve port with the backpressure chamber;
a pilot valve element for opening and closing the pressure equalizing passage;
a biasing member that biases the pilot valve element in a valve closing direction;
a valve holder that holds the main valve element and the pilot valve element so as to be relatively movable in an up-down direction; and
a lifting drive device having a rotor and a stator for moving the valve holder in a lifting direction,
the back pressure chamber is communicated with the valve chamber,
as the valve holder is moved upward by the lift drive device, the pilot valve body and the main valve body engage with the valve holder at different rising amounts in this order, and the pressure equalizing passage opens and then the valve port opens.
2. Electrically operated valve according to claim 1,
when the valve holder is continuously moved upward from the lowermost position by the lift drive device, the pilot valve element is engaged with the valve holder by the biasing force of the biasing member while keeping the main valve element closed at the valve port, and the pilot valve element moves upward together with the valve holder to open the pressure equalizing passage.
3. Electrically operated valve according to claim 1 or 2,
the valve holder has a cylindrical shape, the upper portion of the main valve element, the pilot valve element, and the biasing member are disposed in the valve holder, and the back pressure chamber is defined in the valve holder on the back surface of the main valve element.
4. Electrically operated valve according to claim 3,
the top hole of the valve holder is coupled to a valve shaft that is arranged to be movable up and down by the lift drive device.
5. Electrically operated valve according to claim 1 or 2,
in order to reduce the rotational sliding resistance between the valve holder and the main spool, a gasket is interposed between the valve holder and the main spool.
6. Electrically operated valve according to claim 1 or 2,
the main valve element is biased in a valve closing direction by the biasing member via the pilot valve element.
7. Electrically operated valve according to claim 1 or 2,
the pressure equalizing passage is formed by a vertical hole provided in the main valve element in the ascending/descending direction.
8. Electrically operated valve according to claim 1 or 2,
and a seating surface of the pilot valve element relative to the pressure equalizing passage has an inverted conical surface.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017188018A JP6643292B2 (en) | 2017-09-28 | 2017-09-28 | Electric valve |
| JP2017-188018 | 2017-09-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109578660A CN109578660A (en) | 2019-04-05 |
| CN109578660B true CN109578660B (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810877531.7A Active CN109578660B (en) | 2017-09-28 | 2018-08-03 | Electric valve |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6643292B2 (en) |
| KR (1) | KR102473774B1 (en) |
| CN (1) | CN109578660B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7208127B2 (en) * | 2019-10-11 | 2023-01-18 | 株式会社鷺宮製作所 | Electric valve and refrigeration cycle system |
| JP7138953B2 (en) * | 2020-05-21 | 2022-09-20 | 株式会社不二工機 | electric valve |
| CN111637230B (en) * | 2020-05-22 | 2021-03-30 | 杭州易超新能源汽车科技有限公司 | Novel combination valve |
| JP7465845B2 (en) * | 2021-04-15 | 2024-04-11 | 株式会社鷺宮製作所 | Motor-operated valve and refrigeration cycle system |
| CN115370754A (en) * | 2021-05-17 | 2022-11-22 | 丹佛斯有限公司 | Flow control valve |
| JP2022187265A (en) * | 2021-06-07 | 2022-12-19 | 株式会社不二工機 | electric valve |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS601491Y2 (en) * | 1982-12-28 | 1985-01-16 | 日本電子株式会社 | vacuum valve device |
| JP2898906B2 (en) | 1995-06-29 | 1999-06-02 | 株式会社不二工機 | Electric flow control valve |
| JP2008101765A (en) * | 2006-09-20 | 2008-05-01 | Fuji Koki Corp | Motorized valve |
| JP2009210120A (en) * | 2008-03-06 | 2009-09-17 | Toyota Motor Corp | Pilot type solenoid valve, and fuel cell system |
| CN201827486U (en) * | 2010-03-31 | 2011-05-11 | 张国臣 | Sealing adjustable valve |
| JP5756606B2 (en) * | 2010-06-25 | 2015-07-29 | 株式会社不二工機 | Female thread member, motor-operated valve using the same, and method for manufacturing female thread member for motor-operated valve |
| JP2012117584A (en) * | 2010-11-30 | 2012-06-21 | Saginomiya Seisakusho Inc | Electric flow control valve |
| JP6563213B2 (en) | 2015-02-24 | 2019-08-21 | 株式会社不二工機 | Motorized valve and its assembly method |
| JP6392686B2 (en) * | 2015-03-06 | 2018-09-19 | 株式会社鷺宮製作所 | Motorized valve |
| JP6706574B2 (en) * | 2016-12-13 | 2020-06-10 | 太平洋工業株式会社 | valve |
-
2017
- 2017-09-28 JP JP2017188018A patent/JP6643292B2/en active Active
-
2018
- 2018-06-18 KR KR1020180069375A patent/KR102473774B1/en active IP Right Grant
- 2018-08-03 CN CN201810877531.7A patent/CN109578660B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| KR102473774B1 (en) | 2022-12-05 |
| JP2019060479A (en) | 2019-04-18 |
| KR20190037079A (en) | 2019-04-05 |
| CN109578660A (en) | 2019-04-05 |
| JP6643292B2 (en) | 2020-02-12 |
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