CN111412295A - Electric valve - Google Patents

Electric valve Download PDF

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Publication number
CN111412295A
CN111412295A CN202010305838.7A CN202010305838A CN111412295A CN 111412295 A CN111412295 A CN 111412295A CN 202010305838 A CN202010305838 A CN 202010305838A CN 111412295 A CN111412295 A CN 111412295A
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CN
China
Prior art keywords
valve
needle
guide hole
needle valve
tapered
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010305838.7A
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Chinese (zh)
Other versions
CN111412295B (en
Inventor
中川大树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saginomiya Seisakusho Inc
Original Assignee
Saginomiya Seisakusho Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of CN111412295A publication Critical patent/CN111412295A/en
Application granted granted Critical
Publication of CN111412295B publication Critical patent/CN111412295B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F16K1/38—Valve members of conical shape
    • 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
    • F16K1/42—Valve seats
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
    • 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
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Lift Valve (AREA)

Abstract

In the electric valve, when foreign matters bite into a valve port (13), frictional resistance between a needle valve (3) and guide holes (14, 21c) is suppressed, and the needle valve (3) is prevented from being restrained and moves forward and backward smoothly. A valve chamber (1A) and a valve port (13) are provided in a valve body (1). A needle-like part (31) inserted into the tip of the rod-like needle valve (3) with respect to the valve port (13). A cylindrical portion (33) of a needle valve (3) is guided so as to be inserted through a body guide hole (14) of a valve body (1) and a drive portion guide hole (21c) of a support member (2). The needle valve (3) is driven by a stepping motor (5), and the needle valve (3) is driven to advance and retreat by a screw feed mechanism of an external screw thread portion (21a) and an internal screw thread portion (521 a). The clearance between the body guide hole (14) and the drive portion guide hole (21c) and the cylindrical portion (33) of the needle valve (3) is set larger than the clearance between the valve port (13) and the needle portion (31) of the needle valve (3).

Description

Electric valve
The patent application of the invention is a divisional application of an invention patent application with the international application date of 2017, 05 and 23, the date of entering the Chinese country stage of 2018, 11 and 27, the national application number of 201780032912.9 (international application number PCT/JP2017/019152) and the name of an invention of an electric valve.
Technical Field
The present invention relates to an electrically operated valve for controlling a flow rate of a fluid such as a refrigerant in an expansion valve of a refrigeration circuit of an air conditioner, a refrigerator, or the like.
Background
Conventionally, as an electrically operated valve used in a refrigeration circuit such as an air conditioner or a refrigerator, there are electrically operated valves disclosed in, for example, japanese patent laid-open nos. 2013 and 204613 (patent document 1) and 2011 and 174587 (patent document 2).
In the motor-operated valve of patent document 1, a magnetic rotor is disposed in a housing of a stepping motor, and a needle valve having a needle portion (valve body portion) at a lower portion is inserted and fitted into a center of a male screw shaft fastened to the magnetic rotor. In addition, the male screw shaft constitutes a screw feeding mechanism together with the female screw of the support member on the valve main body side. The needle valve is driven to advance and retreat by the rotation of the magnetic rotor and the screw feed mechanism, and the opening degree of the valve port (valve port) is controlled. In the motor-operated valve of patent document 2, the valve element is not a needle valve, but is configured to be driven to advance and retreat by rotation of a magnetic rotor and a screw feed mechanism.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-204613
Patent document 2: japanese patent laid-open publication No. 2011-
Disclosure of Invention
Problems to be solved by the invention
In recent years, improvement of energy saving performance has been actively studied in air conditioners and refrigerators, and similar performance is required also for motor-operated valves used in refrigeration circuits thereof. For example, in order to improve energy saving, measures are taken to reduce the circulation amount of the refrigerant in the refrigeration cycle by operating the compressor at a low frequency. In this case, the flow rate is required to be throttled by making the valve opening of the electric valve very small simultaneously with the circulation amount, and the electric valve is required to have high controllability in the minute flow rate region.
However, if the valve opening degree is made very small, foreign matter may bite between the valve port and the tip end portion (needle portion) of the needle valve, and there is a problem that frictional resistance with a guide portion (hole or the like) that guides the needle valve increases, the operation of the needle valve deteriorates, and the needle valve is restrained and malfunctions. In particular, in the case of a low flow rate, the influence of foreign matter becomes large because the clearance between the straight portion (or needle portion) of the needle valve and the valve port is controlled to be small.
The invention provides an electrically operated valve, which can restrain friction resistance between a needle valve and a guide hole when foreign matters bite into a valve port, prevent the restriction of the needle valve and smoothly move forward and backward.
Means for solving the problems
The motor-operated valve according to claim 1 includes: a valve chamber provided inside the valve main body and having a valve port; a rod-shaped needle valve inserted into the needle portion at the tip end thereof with respect to the valve port; a guide hole through which an intermediate portion of the needle valve is inserted to guide the needle valve; and a driving portion that drives the needle valve to advance and retreat, wherein a gap between the guide hole and the intermediate portion of the needle valve is set to be larger than a gap between the valve port and the needle portion of the needle valve. In addition, although the intermediate portion of the needle valve or the guide hole may be slightly tapered, the clearance between the guide hole and the intermediate portion of the needle valve is the smallest clearance between the guide hole and the intermediate portion.
The electrically operated valve according to claim 2 is characterized in that the guide hole is composed of a body guide hole provided in a part of the valve body and a drive portion guide hole formed in a part of the drive portion, and a clearance between the drive portion guide hole and the intermediate portion of the needle valve is set to be larger than a clearance between the body guide hole and the intermediate portion of the needle valve.
The electrically operated valve according to claim 3 is characterized in that the guide hole is composed of a body guide hole provided in a part of the valve body and a drive portion guide hole formed in a part of the drive portion, and a clearance between the body guide hole and the intermediate portion of the needle valve is set to be larger than a clearance between the drive portion guide hole and the intermediate portion of the needle valve.
The electrically operated valve according to claim 4 is characterized in that the needle portion of the needle valve includes a flat portion at an end portion on the side of the middle portion, the flat portion minimizing a gap between the needle portion of the needle valve and the valve port.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the motor-operated valve of claim 1, even when foreign matter bites into between the valve port and the needle portion, the frictional resistance between the intermediate portion of the needle valve and the guide hole is suppressed, and the restriction of the needle valve is prevented, so that the needle valve can smoothly move forward and backward. That is, if the gap between the valve port and the needle-like portion is larger than the gap between the guide hole and the intermediate portion of the needle valve, the needle valve is restrained by the guide hole when foreign matter bites into the gap between the valve port and the needle-like portion.
According to the electrically operated valve of claim 2, in addition to the effect of claim 1, since the clearance between the driving portion guide hole and the intermediate portion of the needle valve is set to be larger than the clearance between the main body guide hole and the intermediate portion of the needle valve, the sealability of the main body guide hole can be improved, and the sliding resistance between the intermediate portion and the driving portion guide hole can be suppressed.
According to the electrically operated valve of claim 3, in addition to the effect of claim 1, since the clearance between the body guide hole and the intermediate portion of the needle valve 3 is set to be larger than the clearance between the drive portion guide hole and the intermediate portion of the needle valve, even if a misalignment occurs when, for example, the support member is pressed against the valve body at the time of assembly, the misalignment can be absorbed.
According to the electrically operated valve of claim 4, in addition to the effects of any one of claims 1 to 3, the minimum minute flow rate region can be secured to be constant in the range in which the straight portion is located within the valve port even if the advancing and retreating position of the needle valve varies.
Drawings
Fig. 1 is a longitudinal sectional view of an electrically operated valve according to an embodiment of the present invention.
Fig. 2 is an enlarged view of the needle portion and the vicinity of the valve port in the embodiment.
Fig. 3 is an enlarged view of a portion of the cylindrical portion and the guide hole in the embodiment.
Detailed Description
Hereinafter, embodiments of the motor-operated valve according to the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of an electrically operated valve of the embodiment. Note that the concept of "top and bottom" in the following description corresponds to the top and bottom in the drawing of fig. 1.
The motor-operated valve has a valve body 1 formed by cutting a metal member such as stainless steel or brass, and the valve body 1 has a valve chamber 1A therein. A first joint pipe 11 that communicates with the valve chamber 1A is connected to one side of the outer periphery of the valve main body 1. Further, a second joint pipe 12 is connected to the lower end of the valve main body 1, a valve port 13 is formed in the inner bottom surface of the valve main body 1, and the second joint pipe 12 is communicated with the valve chamber 1A through the valve port 13. The first joint pipe 11 and the second joint pipe 12 are fastened to the valve main body 1 by brazing or the like. A body guide hole 14, which is a part of a "guide hole" opened to an upper end, and a mounting hole 15 are formed in the valve body 1 on the side opposite to the valve port 13, and the support member 2 is press-fitted into the mounting hole 15 to be mounted.
The support member 2 constitutes a part of the "drive portion", and includes a substantially cylindrical holder portion 21, a flange portion 22 formed on the holder portion 21 on the valve main body 1 side, and a fixed-side stopper portion 23. A male screw portion 21a is formed on the outer periphery of the holder portion 21, and a cylindrical rotor guide 21b for guiding a magnetic rotor 52 described later is formed on the upper portion of the male screw portion 21 a. A drive portion guide hole 21c, which is a part of a "guide hole", is formed in the center of the support member 2 coaxially with the axis X of the valve port 13, and the needle valve 3 is inserted into the drive portion guide hole 21 c.
The needle valve 3 is formed of a metal member such as stainless steel or brass, and has a needle-like portion 31 at the lower end and a tapered portion 32 in the shape of a truncated cone. Further, the needle valve 3 has: a cylindrical portion 33 as an "intermediate portion" inserted through the main body guide hole 14 of the valve main body 1 and the driving portion guide hole 21c of the support member 2; and a rod-shaped rod portion 34 having a smaller diameter than the cylindrical portion 33. The biasing spring 4 is disposed in a compressed state around the rod portion 34 and between the step portion 33a of the columnar portion 33 and the magnetic rotor 52. Thereby, the needle valve 3 always biases the magnetic rotor 52 toward the valve port 13.
A cap 16 is attached to the upper end of the valve main body 1, and a housing 51 of the stepping motor 5 constituting a part of the "driving portion" is airtightly fixed to the cap 16 by welding or the like. A magnetic rotor 52 having an outer peripheral portion magnetized in a plurality of poles is rotatably provided in the housing 51. Further, a stator coil 53 is disposed on the outer periphery of the housing 51, and the stepping motor 5 rotates the magnetic rotor 52 in accordance with the number of pulses by applying a pulse signal to the stator coil 53. The magnetic rotor 52 is constituted by a rotor main body 521 and a magnet 522 fastened to the outer periphery thereof.
A female screw 521a and a screw hole thereof are formed coaxially with the axis X of the valve port 13 below the center of the rotor body 521, and a cylindrical slide hole 521b having a diameter smaller than the inner circumference of the screw hole of the female screw 521a is formed at the center of the rotor body 521. A needle valve insertion hole 521c is formed in the upper center of the slide hole 521 b. Further, a movable-side stopper portion 52a protruding downward is formed at one lower portion of the magnet 522.
The cylindrical portion 33 of the needle valve 3 is inserted through the body guide hole 14 of the valve body 1 and the drive portion guide hole 21c of the support member 2, and the end portion 3a of the needle valve 3 (the end portion of the rod portion 34) is inserted through the needle valve insertion hole 521c of the rotor body 521. The rotor guide 21b of the support member 2 is inserted into the slide hole 521b of the magnetic rotor 52, and the female screw 521a on the magnetic rotor 52 side is screwed to the male screw 21a on the support member 2 side. Then, a fixing member 6 is press-fitted into the end 3a of the needle valve 3 and is fastened (the needle valve 3 and the fixing member 6) by welding.
The male screw 21a and the female screw 521a are screw feeding mechanisms, but in this embodiment, the male screw 21a and the female screw 521a are right screws. Further, a compression spring 54 that biases the magnetic rotor 52 in the valve closing direction is disposed between the housing 51 and the magnetic rotor 52, and the backlash between the male screw portion 21a and the female screw portion 521a is removed, thereby functioning to reduce the operating sound of the magnetic rotor 52.
According to the above configuration, when the magnetic rotor 52 rotates, the magnetic rotor 52 moves in the axis X direction (up and down) by the screw feeding action of the female screw 521a and the male screw 21 a. Further, the fixing member 6 at the upper end of the needle valve 3 abuts against the magnetic rotor 52 by the biasing force of the biasing spring 4, the needle valve 3 moves together with the magnetic rotor 52, and the needle portion 31 of the needle valve 3 moves forward and backward with respect to the valve port 13. Thereby, the opening degree of the valve port 13 is changed, and the flow rate of the refrigerant flowing from the first joint pipe 11 to the second joint pipe 12 or the flow rate of the refrigerant flowing from the second joint pipe 12 to the first joint pipe 11 is controlled.
The needle portion 31 has a cylindrical straight portion 31a at an end portion on the tapered portion 32 side, and a gap between the straight portion 31a and the valve port 13 is small, and when the straight portion 31a is positioned in the valve port 13, control is performed in a small flow rate region. Further, the lower end position of the magnetic rotor 52 is restricted by the fixed-side restricting portion 23. That is, when the magnetic rotor 52 rotates and descends, the movable-side stopper 52a passes above the fixed-side stopper 23, and when the movable-side stopper 52a abuts against the fixed-side stopper 23, the rotation is restricted.
Fig. 2 is an enlarged view of the needle portion 31 and the vicinity of the valve port 13, and fig. 3 is an enlarged view of the cylindrical portion 33 and a portion of the guide hole. As shown in fig. 2, when the diameter of the valve port 13 is D1 and the diameter of the straight portion 31a of the needle 31 is D2, the diameter D2 is slightly smaller than the diameter D1,
D1－D2＝CL1
a gap is formed between the valve port 13 and the needle 31 (straight portion 31 a).
Further, as shown in fig. 3, when the diameter of the body guide hole 14 is D3, the diameter of the driving portion guide hole 21c is D4, and the diameter of the cylindrical portion 33 of the needle valve 3 is D5, D3 and D4 are slightly larger than D5, and the diameters become D3 and D4
D3 < D4. And the number of the first and second electrodes,
D3－D5＝CL2
is a gap between the main body guide hole 14 and the cylindrical portion 33,
D4－D5＝CL3
a gap is formed between the driving portion guide hole 21c and the cylindrical portion 33. Thus, become
CL2＜CL3。
In this embodiment, the following means
CL1＜CL2＜CL3。
That is, the clearances (C L2 and C L3) between the body guide hole 14 and the drive portion guide hole 21C (guide holes) and the columnar portion 33 (intermediate portion) are set to be larger than the clearance (C L1) between the valve port 13 and the needle portion 31 at the tip end of the needle valve 3.
Accordingly, even when foreign matter bites into the space between the valve port 13 and the needle portion 31, the needle valve 3 is prevented from being restrained by suppressing the frictional resistance between the cylindrical portion 33 of the needle valve 3 and the body guide hole 14 and the driving portion guide hole 21c, and the forward and backward movement of the needle valve 3 can be smoothly performed. That is, if the clearance between the valve port 13 and the needle-like portion is larger than the clearance between the guide hole and the cylindrical portion 33 of the needle 3, the needle 3 is restrained by the guide hole when a foreign matter bites into the clearance between the valve port 13 and the needle-like portion 3.
Further, the clearance (C L3) between the drive portion guide hole 21C and the cylindrical portion 33 (intermediate portion) of the needle valve 3 is set larger than the clearance (C L2) between the main body guide hole 14 and the cylindrical portion 33 (intermediate portion) of the needle valve 3, and therefore, the sealing property of the main body guide hole 14 can be improved, and the sliding resistance between the cylindrical portion 33 and the drive portion guide hole 21C can be suppressed.
In contrast to the above-described embodiment, the clearance (C L2) between the body guide hole 14 and the cylindrical portion 33 (intermediate portion) of the needle valve 3 can be set larger than the clearance (C L3) between the drive portion guide hole 21C and the cylindrical portion 33 (intermediate portion) of the needle valve 3. in this case, the cylindrical portion 33 does not actually come into contact with the body guide hole 14, and therefore, even if a misalignment occurs when the support member 2 is pressed against the valve body 1 during assembly, the misalignment can be absorbed.
In the electrically operated valve of the above embodiment, the male screw portion 21a and the female screw portion 521a constituting the screw feeding mechanism are in a relationship in which the male screw portion 21a is fixed to the valve body 1 side and the female screw portion 521a is fixed to the magnetic rotor 52 side, but the opposite configuration is also possible. That is, the present invention can also be applied to the following motor-operated valve: for example, as disclosed in patent document 1, a screw feed mechanism is configured by screwing a male screw portion having a fixed relationship with respect to a magnetic rotor and a female screw portion having a fixed relationship with respect to a valve body.
In the above embodiment, the driving unit drives the needle valve to advance and retreat by the screw feeding function, but the driving unit may have another configuration as long as it drives the needle valve to advance and retreat.
While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications of design and the like without departing from the scope of the present invention are also included in the present invention.
Description of the symbols
1-valve body, 1A-valve chamber, 11-first joint pipe, 12-second joint pipe, 13-valve port, 14-body guide hole (guide hole), 2-support member (drive part), 21-bracket part, 21A-external thread part, 21 b-rotor guide, 21 c-drive part guide hole (guide hole), 3-needle valve, 31-needle part, 31A-flat part, 32-tapered part, 33-cylindrical part (middle part), 34-rod part, 4-forcing spring, 5-stepping motor (drive part), 51-housing, 52-magnetic rotor, 521A-internal thread part, 53-stator coil, X-axis.

Claims (6)

1. An electrically operated valve, comprising:
a valve chamber provided inside the valve main body and having a valve port;
a rod-shaped needle valve which is inserted into the needle-shaped portion at the tip end with respect to the valve port, and has a cylindrical or tapered cylindrical intermediate portion;
a guide hole through which the intermediate portion of the needle valve is inserted to guide the needle valve; and
a driving part for driving the needle valve to advance and retreat,
the clearance which is the minimum difference between the inner diameter of the guide hole and the outer diameter of the intermediate portion of the needle valve is set to be larger than the clearance between the valve port and the needle portion of the needle valve,
a valve intermediate tapered portion that tapers toward the tip of the needle portion is formed between the needle portion and the intermediate portion of the needle valve,
a cylindrical straight portion is formed at an end portion of the needle portion on the intermediate portion side adjacent to the valve intermediate tapered portion.
2. Electrically operated valve according to claim 1,
the length of the straight portion is smaller than the outer diameter of the straight portion.
3. Electrically operated valve according to claim 1,
the needle valve has a cylindrical intermediate portion having an outer diameter smaller than an inner diameter of the guide hole, and a tip of the intermediate portion on the needle side protrudes into the valve chamber.
4. Electrically operated valve according to claim 1,
the straight portion, the needle-like intermediate tapered portion, and the needle-like distal tapered portion are formed in the needle-like portion from the intermediate portion side,
the needle-like intermediate tapered portion is adjacent to the straight portion and tapered toward the tip side of the needle-like portion at a first taper angle,
the needle-like distal end tapered portion is adjacent to the needle-like intermediate tapered portion and tapered toward the distal end side at a second taper angle larger than the first taper angle.
5. Electrically operated valve according to claim 4,
the length of the straight portion is shorter than that of the needle-like intermediate tapered portion.
6. Electrically operated valve according to claim 1,
at least a part of the straight portion is positioned inside the valve port in a valve-closing position where the needle valve moves to the valve port side at the maximum.
CN202010305838.7A 2016-06-22 2017-05-23 Electric valve Active CN111412295B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2016-123750 2016-06-22
JP2016123750A JP6552457B2 (en) 2016-06-22 2016-06-22 Motorized valve
PCT/JP2017/019152 WO2017221612A1 (en) 2016-06-22 2017-05-23 Electrically operated valve
CN201780032912.9A CN109196259B (en) 2016-06-22 2017-05-23 Electric valve

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201780032912.9A Division CN109196259B (en) 2016-06-22 2017-05-23 Electric valve

Publications (2)

Publication Number Publication Date
CN111412295A true CN111412295A (en) 2020-07-14
CN111412295B CN111412295B (en) 2023-04-07

Family

ID=60784085

Family Applications (4)

Application Number Title Priority Date Filing Date
CN202010305836.8A Active CN111412294B (en) 2016-06-22 2017-05-23 Electric valve
CN202010305838.7A Active CN111412295B (en) 2016-06-22 2017-05-23 Electric valve
CN201780032912.9A Active CN109196259B (en) 2016-06-22 2017-05-23 Electric valve
CN202010305851.2A Active CN111412296B (en) 2016-06-22 2017-05-23 Electric valve

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN202010305836.8A Active CN111412294B (en) 2016-06-22 2017-05-23 Electric valve

Family Applications After (2)

Application Number Title Priority Date Filing Date
CN201780032912.9A Active CN109196259B (en) 2016-06-22 2017-05-23 Electric valve
CN202010305851.2A Active CN111412296B (en) 2016-06-22 2017-05-23 Electric valve

Country Status (3)

Country Link
JP (1) JP6552457B2 (en)
CN (4) CN111412294B (en)
WO (1) WO2017221612A1 (en)

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CN111412295B (en) 2023-04-07
CN109196259A (en) 2019-01-11
CN111412296B (en) 2022-07-08
CN111412294A (en) 2020-07-14
JP6552457B2 (en) 2019-07-31
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CN111412296A (en) 2020-07-14
CN109196259B (en) 2020-05-01

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