CN103775717B - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
- Publication number
- CN103775717B CN103775717B CN201210403339.7A CN201210403339A CN103775717B CN 103775717 B CN103775717 B CN 103775717B CN 201210403339 A CN201210403339 A CN 201210403339A CN 103775717 B CN103775717 B CN 103775717B
- Authority
- CN
- China
- Prior art keywords
- expansion valve
- electric expansion
- valve
- seal
- stepper motor
- 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.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 101
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 79
- 229910052742 iron Inorganic materials 0.000 claims description 37
- 238000002347 injection Methods 0.000 claims description 33
- 239000007924 injection Substances 0.000 claims description 33
- 230000033001 locomotion Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 239000000306 component Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000008358 core component Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift 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
-
- 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
Abstract
The invention relates to an electronic expansion valve (1), comprising: a valve member (20) for regulating the flow of fluid through the electronic expansion valve (1), a stepper motor (40) for powering an operating mechanism of the valve member (20), and a solenoid retaining mechanism (60) for providing a de-energized auto-close function for the valve member (10). A first seal is provided between the valve member (20) and a motor housing (41) of the stepping motor (40), a second seal is provided between the motor housing (41) of the stepping motor (40) and a solenoid housing (61) of the solenoid holding mechanism (60), and a third seal is provided at an end of the solenoid housing (61) opposite to the stepping motor (40). The electronic expansion valve can realize the sealing of IP67 grade on the whole by arranging the sealing elements among the valve component, the stepping motor and the solenoid coil holding mechanism, thereby being used in the environment with strict sealing requirements.
Description
Technical field
It is particularly a kind of to realize the electric expansion valve of high sealing grade the present invention relates to a kind of electric expansion valve.
Background technology
Electric expansion valve is the important component in cooling/heating system, is mainly used in the flow progress to refrigerant fluid
Regulation.Traditional electric expansion valve generally comprises drive mechanism（Stepper motor）, executing agency（Thread screw mechanism）, throttling machine
Structure（Needle valve seat）And related auxiliary body.
However, traditional electric expansion valve is after power is turned off, due to thread screw, mechanism loses driving force, so electronics is swollen
Swollen valve can not be closed automatically.Therefore, in order to safely block stream, generally in the upstream of electric expansion valve or downstream tandem one
Individual independent electromagnetic switch valve, it typically is normally close valve, opens in power-up and closes when power is off.So, when system is disconnected
When electric, electromagnetic switch valve will turn off to block stream.
But, using configured as described above, on the one hand add system due to adding an independent electromagnetic switch valve
Overall cost, on the other hand for the electromagnetic switch valve of connecting, two soldering points will be increased in pipeline（That is, electromagnetic switch
At the entrance and exit of valve）, this not only adds the assembly cost of system but also adds the risk of system leak.
Another method for realizing that electric expansion valve is closed automatically after a loss of power is to provide stand-by power supply for electric expansion valve,
For example increase the super capacitor for storing electric energy in the control panel of electric expansion valve or reserve battery is installed, but this method
Also increase the cost of electric expansion valve and need more complicated controller.
In addition, high sealing grade can be realized in the prior art（Such as IP67 seals grade）Electric expansion valve only include
Stepper motor or electromagnetic valve coil, not yet occur not only including stepper motor but also can realize power-off automatically including electromagnetic valve coil
The electric expansion valve of the high-protection level of closing.
The present invention proposes a kind of electric expansion valve that can be closed automatically after a loss of power, and the magnetic valve can realize compared with
High sealing grade, than if realizing that IP67 seals grade, so that this electric expansion valve can be used in sealing etc.
Level is required in higher application environment.
The content of the invention
One purpose of one or more embodiments of the invention be to provide it is a kind of can be in the ring higher to seal request
The electric expansion valve used in border, can be normally reached IP67 sealing grades.
Another purpose of one or more embodiments of the present invention is to provide one kind can be automatic under powering-off state
The electric expansion valve of closing.
Another purpose of one or more embodiments of the present invention is to provide a kind of by relatively simple sealing group
Close and realize the electric expansion valve with good seal performance.
One or more of to achieve these goals, according to one aspect of the invention there is provided a kind of electric expansion valve,
It includes：For the valve member for the flow for adjusting the fluid for flowing through electric expansion valve；For being provided for the operating mechanism of valve member
The stepper motor of power；With for for valve member provide power-off automatic closing function magnet coil maintaining body, wherein, in valve
First seal is provided between part and the electric machine casing of stepper motor, is protected in electric machine casing and the magnet coil of stepper motor
Second seal is provided between the solenoid housing for holding mechanism, and it is opposite with stepper motor in solenoid housing
End is provided with the 3rd seal.
By between the valve member in electric expansion valve and the electric machine casing of the stepper motor as power driving part
First seal is set, the is set between the electric machine casing of stepper motor and the solenoid housing of magnet coil maintaining body
Two seals and the 3rd seal of setting on another end opposite with stepper motor of solenoid housing, so that
Tight sealing is respectively formed at the position that the possibility of electric expansion valve is in communication with the outside, thus by the workpiece of electric expansion valve
All it is sealed in its housing, and reaches higher sealing grade, such as reaches that IP67 seals grade, so that according to
The electric expansion valve of the present invention can be used in use environment it is more severe in the case of.In addition, according to the electronic expansion of the present invention
Valve can also provide power-off automatic closing function, prevent electric expansion valve from occurring in the course of the work out of hand due to power-off
Situation.
Brief description of the drawings
By description referring to the drawings, the feature of one or more embodiments of the present invention will be more readily understood
And advantage, wherein：
Fig. 1 is the perspective view of the electric expansion valve according to the present invention；
Fig. 2 is that the electric expansion valve shown in Fig. 1 is in the sectional view of original state；
Fig. 3 is the partial enlarged drawing at the magnet coil maintaining body of the electric expansion valve shown in Fig. 2；
Fig. 4 is the partial enlarged drawing at the stepper motor of the electric expansion valve shown in Fig. 2；
Fig. 5 is the three-dimensional cutaway view of the magnet coil for the electric expansion valve according to the present invention；
Fig. 6 is the section plan of the magnet coil for the electric expansion valve according to the present invention；
Fig. 7 is the three-dimensional cutaway view of the injection nut for the electric expansion valve according to the present invention；
Fig. 8 is the section plan of the stator of the stepper motor for the electric expansion valve according to the present invention；
Fig. 9 is the stereogram of the Auxiliary support ring for the electric expansion valve according to the present invention；
Figure 10 is the section plan of the Auxiliary support ring for the electric expansion valve according to the present invention；
Figure 11 is that the electric expansion valve shown in Fig. 1 is in the sectional view of normal regulating state；And
Figure 12 is the sectional view of the second embodiment of the electric expansion valve according to the present invention.
Embodiment
Description of preferred embodiments is only exemplary below, and is definitely not to the present invention and its application or usage
Limitation.
What the directional terminology " top " or " top " used during being illustrated to embodiments of the invention referred to
It is to show the diagram of electric expansion valve and its building block as with reference to closer to the orientation at the top of diagram；And directional terminology " under
Side " or " bottom " are referred to using the diagram for showing electric expansion valve and its building block as with reference to the side closer to diagram bottom
Position.
Illustrate the electronic expansion with high sealing grade according to the first embodiment of the present invention with reference first to accompanying drawing 1-11
The structure of valve 1 and its building block.
Fig. 1 is the three-dimensional knot for showing the electric expansion valve 1 with high sealing grade according to the first embodiment of the present invention
Composition, electric expansion valve 1 includes valve member 20, for driving the executing agency of valve member 20 executing agency is rotated
Stepper motor 40 and for the magnet coil maintaining body 60 for the executing agency for keeping and discharging valve member 20, wherein, valve
The flow that part 20 is used for the fluid to flowing through electric expansion valve 1 is adjusted, so as to supply the system of certain flow rate as desired
Refrigerant flow.
2-4 explains the structure of the electric expansion valve 1 according to the present invention referring to the drawings.Valve member 20 includes valve
The entrance 21-1 being connected with feed line 11 and the outlet 21-2 being connected with outflow pipeline 12 are provided with body 21, valve body 21.
Valve seat 22 is provided with the outlet 21-2 of valve body 21, the top of the valve seat 22 in valve body 21 is formed with for accommodating fluid and rising
To the valve pocket 21-3 of depressurization.Electric expansion valve 1 also includes that the stream for flowing through valve member 20 with regulation can be coordinated with valve seat 22
The needle-valve 23 of the flow of body.Needle-valve 23 is driven by executing agency, and executing agency is then kept by stepper motor 40 and magnet coil
Mechanism 60 is driven and kept.
The executing agency of needle-valve 23 includes main shaft 50 and the ut socket 24 coordinated with the screw thread of main shaft 50, wherein nut sleeve
Cylinder 24 is slidably fit into the through hole in valve body 21, but ut socket 24 can not rotate relative to valve body 21, and needle-valve 23 leads to
Cross the end that retainer ring 26 is fixed on ut socket 24.Ut socket 24 has superposed small inside diameter and positioned at bottom
Large diameter portion, internal thread is provided with small inside diameter, and the external screw thread on the second end 50-2 with main shaft 50 coordinates, from
And the rotary motion of main shaft 50 is converted into the axial movement of ut socket 24.It is provided with the large diameter portion of ut socket 24
Spring 25, one end of spring 25 is resisted against in the stage portion of the interface between large diameter portion and small inside diameter, spring 25 it is another
One end is resisted against on the upper end of needle-valve 23.Spring 25 will apply elastic force so that another effect of needle 23 from one end of needle 23
Have suitably against power between end and valve seat 22, this aspect protects needle 23 and valve seat 22 to be not damaged by, on the other hand
There is provided reliable sealing effectiveness.
In order to provide better seal effect of the needle-valve 23 relative to the opening on valve seat 22, can needle 23 and valve
Be provided with the ends that seat 22 coordinates can against the end face of valve seat 22 sealing ring 23-1, according to the preferred of the present invention
In embodiment, sealing ring 23-1 is arranged on the effect end of needle-valve 23 around needle-valve 23.
Ut socket 24 is coordinated by screw thread with main shaft 50, because ut socket 24 can only slide axially in valve body 21
And can not be rotated relative to valve body 21, therefore when main shaft 50 rotates, by coordinating between main shaft 50 and ut socket 24
Screw thread, is transformed into sliding axially for ut socket 24 by the rotary motion of main shaft 50, spiral shell is fixedly provided in it is possible thereby to drive
Needle-valve 23 on the bottom of mother sleeve 24 so as to the aperture of the opening on regulating valve seat 22, is thus adjusted axially movable
Throttled electric expansion valve 1 fluid flow velocity and open and close electric expansion valve 1.
The upper end of ut socket 24 and the second end 50-2 of main shaft 50 are slidably arranged in the through hole of the second block 46
In, and it is provided with spring 27 between the outside stage portion of ut socket 24 and the lower surface of the second block 46.Spring 27 can
Auxiliary nut set in the case of being powered off with providing downward spring force for ut socket 24 with the electric expansion valve 1 being described below
Cylinder 24, needle 23 and main shaft 50 are moved downward, so that needle 23 moves to the position for the opening closed on valve seat 22.Ability
Field technique personnel are appreciated that it is conducted oneself with dignity can be with because ut socket 24, needle 23 and main shaft 50 itself have certain deadweight
For providing this power moved downward, therefore spring 27 is dispensed.
Preferably, the limits device of the excessive rotation of limitation main shaft 5 is additionally provided with according to the electric expansion valve 1 of the present invention.
The limits device includes the arresting lever 53 being fixedly provided on the second block 46, the spiral shell set with being relatively fixed around main shaft 50
Rotation guide rail 54 and the sliding part 55 slided on helical guideway 54.Main shaft 50 be rotatably driven ut socket 24 and needle-valve 23 to
During lower motion, sliding part 55 stops due to being stopped bar 53 and can not jointly rotated with main shaft 50, and therefore along
Helical guideway 54 is moved downward, when sliding part 55 moves to the flange end face on main shaft 50（Diameter i.e. on main shaft 50 is bigger
Part）, it is impossible to enough continue to move downward, so as to prevent the rotary motion of main shaft 50, thus prevent turning for stepper motor 40
The continuation rotation of son, so as to protect needle-valve 23 and valve seat 22 against damages.Can be by adjusting the longitudinal direction of helical guideway 54 effectively
Length can confined rotating range come adjust main shaft 50.
Main shaft 50 is driven by the rotor 43 of stepper motor 40, and the rotor 43 of stepper motor 40 is arranged on fixed by sleeve 44
The inside of son 42, when stepper motor 40 is controlled turn-on power supply, rotor 43 rotates in sleeve 44, is engaged so as to drive
Main shaft 50 together rotates.The stepper motor 40 also includes the electric machine casing 41 for being arranged on the outside of stator 42, electric machine casing
41 constitute a part for the shell of electric expansion valve 1.Here, the bottom of sleeve 44 is solid by the block 46 of connector 47 and second
Surely link together, connector 47 is linked together by big nut 28 with valve body 21.In order to ensure the inside of valve body 21
Sealing, can be provided with seal between connector 47 and valve body 21, and seal turns into the 4th sealing in this embodiment
Part, it is preferable that the 4th seal is the 4th sealing ring 74.
The first end 50-1 of main shaft 50 is bonded together with the magnet coil maintaining body 60 of electric expansion valve 1.Electromagnetism
Coil-retention mechanism 60 include solenoid housing 61, be arranged in solenoid housing 61 center yoke 65, be arranged on magnetic
Magnet coil 62 on the periphery of yoke 65 and the iron core being arranged in the inner chamber of yoke 65, yoke 65 pass through the He of upper gasket 66
Lower gasket 67 is fixedly provided in solenoid housing 61.Iron core is arranged on the inner chamber of yoke 65 by cylindrical sleeve 68
In, iron core includes determining iron 63 and dynamic iron 64, determines iron 63 and is fixedly provided in the inner chamber of yoke 65, and relative to cylindrical jacket
Cylinder 68 is fixed, and dynamic iron 64 is arranged in cylindrical sleeve 68, and the first end of cylindrical sleeve 68 is fixed on determining iron 63
Together, together with its relative the second end is permanently connected with the first block 45, moving iron 64 can be by magnet coil 62
Carry out control system of switching on or off electricity to be activated, so that dynamic iron 64 is slided in cylindrical sleeve 68.
Dynamic iron 64 is engaged with the first end 50-1 of main shaft 50 in the way of it can rotate but be unable to relative axial movement.Tool
Body, the first end 50-1 and dynamic iron 64 of main shaft 50 can be engaged by rolling component known in the art, for example, is led to
Cross ball bearing or needle bearing.So, when the rotor 43 of stepper motor 40 drives main shaft 50 to rotate, moving iron 64 can not be with
It is rotated, so that dynamic iron 64 and the adhesive determined between iron 63 are more firm.And when magnet coil maintaining body 60 removes electricity,
Dynamic iron 64 can in axial direction be moved together with main shaft 50.
In addition, together with the first block 45 is also permanently connected with sleeve 44, the rotor 43 of stepper motor 40 is rotatably
It is arranged in sleeve 44, together with the other end of sleeve 44 is permanently connected with the second block 46 by connector 47, connector
47 are linked together by circumferential big nut 28 and valve body 21.
In order that the sealing protection performance of IP67 grades can be realized according to the electric expansion valve 1 of the present invention, it is necessary first to
Tight seal is realized between the bottom and the external world of the electric machine casing 41 of stepper motor 40, is this motor casing in stepper motor 40
The bottom of body 41 sets first seal.It is auxiliary in being internally provided with for electric machine casing 41 according to a preferred embodiment of the present invention
Help support ring 48, Auxiliary support ring 48 passes through the external screw thread 48-3 that is arranged on and the electric machine casing 41 for being arranged on stepper motor 40
Bottom in internal thread 41-2 be bonded together, such as more clearly from see in Fig. 2, Fig. 4, Fig. 8, Fig. 9 and Figure 10.In figure
Auxiliary support ring 48 for the electric expansion valve 1 according to the present invention is shown in 9 and 10.As illustrated, Auxiliary support ring 48 is wrapped
Include the department of assembly 48-1 for being assembled in electric machine casing 41 and driven for applying in assembling process to Auxiliary support ring 48
The drive division 48-2 of power, is formed with engaged with the internal thread 41-2 in electric machine casing 41 outer on department of assembly 48-1 peripheral part
Screw thread 48-3, and in the department of assembly 48-1 protuberance 48-4 being internally formed towards its center protrusion.When by Auxiliary support
When ring 48 is installed on the electric machine casing 41 of stepper motor 40, sleeves 44 of the protuberance 48-4 in stepper motor 40, and
The joint of Auxiliary support ring 48 and the electric machine casing 41 of stepper motor 40 is provided with the first sealing ring 71, the first sealing ring 71
By protuberance 48-4 be tightly pressed against stepper motor 40 electric machine casing 41, Auxiliary support ring 48 and the three of sleeve 44 it
Between, so as to realize the bottom of electric expansion valve 1 and extraneous tight seal, and cause sealing effectiveness to reach that IP67 seals grade.
In addition, in order to realize the tight seal between solenoid housing 61 and the electric machine casing 41 of stepper motor 40, leading to
Often second seal is provided between the electric machine casing 41 of solenoid housing 61 and stepper motor 40.According to the excellent of the present invention
The embodiment of choosing, solenoid housing 61 is arranged to be threadedly coupled with electric machine casing 41, is provided with interior spiral shell on one of those
Line, is provided with external screw thread on another.In the embodiment shown in the drawings according to the present invention, it is preferable that in magnet coil shell
Body 61 is internally provided with internal thread 61-1, as shown in fig. 6, being simultaneously provided with the electric machine casing 41 of stepper motor 40 and electricity
The external screw thread 41-1 of internal thread 61-1 engagements on magnetic coil housing 61, as shown in Figure 8.Threaded connection can keep stepping electricity
Good sealing between the electric machine casing 41 and solenoid housing 61 of machine 40.In order to realize the motor casing of stepper motor 40
The second sealing ring is provided with further sealing between body 41 and solenoid housing 61, joint portion therebetween
72, it is threadably engaged and sealing ring is sealed between the electric machine casing 41 of stepper motor 40 and solenoid housing 61 and realized
IP67 seals the sealing of grade.According in a preferred embodiment of the present invention, the second sealing ring 72 is arranged on electric machine casing 41
Solenoid housing 61 abut top and solenoid housing 61 in dash forward perisporium between joint, that is to say, that
It is swollen closer to electronics with the threadedly engaged portions of solenoid housing 61 that second sealing ring 72 is disposed relative to electric machine casing 41
The inside of swollen valve 1.In addition, the second sealing ring 72 can also set electric machine casing 41 with solenoid housing 61 relative to both
Between threadedly engaged portions further from the joint of the inside of electric expansion valve 1, this set of the second sealing ring 72 is same
It can realize that the IP67 between electric machine casing 41 and solenoid housing 61 seals the protection effect of grade.It is further preferred that
Circumferential convex 41-3, such as Fig. 8 can be formed on the end face of the second sealing ring of setting 72 of the electric machine casing 41 of stepper motor 40
Shown in, circumferential convex 41-3 can provide supporting role for the second sealing ring 72, for keeping the relative of the second sealing ring 72
Fixed position.
Further, it is tight sealing between the solenoid housing 61 of electric expansion valve 1 and the external world in order to realize,
The 3rd seal is provided with the top of solenoid housing 61.According in a preferred embodiment of the present invention, in electromagnetic wire
Injection nut 30 is provided with the top for enclosing housing 61, and is contacted at the top of solenoid housing 61 with injection nut 30
Surface on be formed with circumferential recess 69, as shown in Figure 3, Figure 5 and Figure 6, for be contained in solenoid housing 61 with injection spiral shell
The 3rd sealing ring 73 of tight seal is formed between mother 30.The concrete structure of nut 30 is molded as shown in fig. 7, the injection shape of nut 30
As cylinder, concavo-convex dentalation staggeredly is formed with the top of cylinder, consequently facilitating being molded being screwed for nut 30.
Fluted 31 are formed on the surface contacted with solenoid housing 61 for being molded nut 30, it is therefore preferable to cylindrical groove, in groove
31 are internally provided with the cylinder 32 for being threaded hole 33.Cylinder 32 passes through known connected mode and the cylinder of injection nut 30
Body portion is fixedly engaged together, such as, and cylinder 32 is entered by the key and slot structure being located at respectively on groove 31 and cylinder 32
Row coordinates, and is achieved between the two being relatively fixed for circumferentially direction.When injection nut 30 is installed to solenoid housing 61
When upper, together with the screwed hole 33 in cylinder 32 is screwed with the threaded post 63-1 on the top for determining iron 63, so that nut will be molded
30 are securely fixed in the solenoid housing 61 of the magnet coil maintaining body 60 of electric expansion valve 1, and by being contained in
The 3rd sealing ring 73 in groove 69 on the top of solenoid housing 61 realizes injection nut 30 and solenoid housing 61
Tight seal, and reach IP67 sealing grades.Although groove 69 described herein as forms the top in solenoid housing 61
On portion surface, groove 69 can also be formed on the surface engaged with solenoid housing 61 in injection nut 30, equally can
Reach identical sealing effectiveness.In addition, although the screwed hole 33 being molded in this embodiment in nut 30, which is formed, is being placed in note
Mould in the cylinder 32 in the groove 31 of nut 30, screwed hole 33 can also be formed directly into injection nut 30, it is possible thereby to
Simplify the structure of injection nut, so as to reduce its manufacturing cost.
In addition, when not having magnet coil maintaining body 60 according to the electric expansion valve 1 of the present invention, can be by changing
The structure of the electric machine casing 41 of injection nut 30 and/or stepper motor 40 makes the injection nut 30 directly be engaged with electric machine casing 41
Together, such as the shape and size for being molded nut 30 are modified as to the part phase with external screw thread 41-1 with electric machine casing 41
Matching, or the part with external screw thread 41-1 of electric machine casing 41 can be modified as to the threaded portion split-phase with injection nut 30
Adapt to.Meanwhile, junction surface office therebetween is provided with the 3rd sealing ring 73, for ensuring electric machine casing 41 and the external world
Between tight seal, reach IP67 sealing grade.
In the assembling process of electric expansion valve 1, can first by the dynamic iron 64 being arranged in cylindrical sleeve 68 and
Determine iron 63, the block 45 of the rotor being arranged in sleeve 44 43 and first and the second block 46, main shaft 50 and valve body 21 and its
Internal associated components and the Auxiliary support ring 48 and connector 47 of the outside for the lower end for being arranged on sleeve 44 are assembled into electronics
The core component of expansion valve 1；Then the electric machine casing 41 of solenoid housing 61 and stepper motor 40 is connected through a screw thread group
It is fitted together, and both joints is provided with the 3rd sealing ring 73；The He of Auxiliary support ring 48 will can be then installed
The core component of the electric expansion valve 1 of first sealing ring 71 is assembled to the electronics that solenoid housing 61 and electric machine casing 41 are constituted
Expand in valve chest so that the threaded post 63-1 determined on the top of iron 63 is reached outside the top of solenoid housing 61；With
The second sealing ring 72 is placed in the groove 69 at the top of solenoid housing 61 afterwards, and injection nut 30 is screwed
Determine on the threaded post 63-1 of iron 63；Finally Auxiliary support ring 48 is screwed in the electric machine casing 41 of stepper motor 40 so that the
One sealing ring 71 is pressed against inwardly projecting circumferential wall, the lateral wall of cylindrical sleeve 44 and the Auxiliary support of electric machine casing 41
Between the protuberance 48-4 of ring 48.Electric expansion valve is formed from there through the threaded connection of three sealing rings and its corresponding position
1 good sealing, and cause sealing property to reach that IP67 seals grade.
Illustrate the course of work of the electric expansion valve 1 according to the present invention briefly below.As shown in Fig. 2 being electric expansion valve 1
Original state, now magnet coil 62 switch on power, the magnetic field that dynamic iron 64 is produced by magnet coil 62 is firm with determining iron 63
Ground is pulled together, in the original state, and the rotor 43 of stepper motor 40 not yet starts rotation, and the bottom of needle-valve 23
It is resisted against on valve seat 22, so that the fluid communication between the entrance 21-1 of electric expansion valve 1 and outlet 21-2 has been blocked, therefore,
Now electric expansion valve 1 is closed.
When being operated by operation device to stepper motor 40, the rotor 43 of stepper motor 40 rotates, so as to drive
Main shaft 50 rotates.The rotary motion of main shaft 50 is coordinated by the screw thread between its second end 50-2 and ut socket 24 to be converted into
The axial movement of ut socket 24.In the starting stage, the rotary motion of main shaft 50 should be converted into ut socket 24 axially to
Upper motion, so that ut socket 24 drives the in axial direction motion upwards together of needle-valve 23, so that the lower end of needle-valve 23
Portion allows to form fluid communication between the entrance 21-1 and outlet 21-2 of valve body 21 away from valve seat 22.Now, electronics is swollen
Swollen valve 1 is in normal operating conditions as shown in figure 11.When needing that the flow of electric expansion valve 1 is adjusted, control is only needed
The rotation of stepper motor 40 processed, you can the distance between the end of metering pin valve 23 and valve seat 22, valve seat 22 is flowed through so as to adjust
In hole fluid flow, that is, regulation electric expansion valve 1 flow.
Power-off automatic closing function is had according to the electric expansion valve 1 of the present invention.When electric expansion valve 1 is powered off suddenly,
The rotor 43 of stepper motor 40 stops the rotation, and thus would be impossible to adjust the aperture of electric expansion valve 1 by stepper motor 40,
It is also impossible to close electric expansion valve 1 in an ON state by stepper motor 40.Now because magnet coil keeps machine
Structure 60 is powered off, therefore it will lose magnetic field, so that dynamic iron 64 is separated with determining iron 63, under gravity, moves iron 64, master
Axle 5, ut socket 24 and the needle-valve 23 being bonded together with ut socket 24 will be moved downward in axial direction, so that pin
Valve 23 falls on valve seat 22, so as to close the through hole on valve seat 22, thus blocks the entrance 21-1 of the valve body 21 of electric expansion valve 1
With the fluid communication between outlet 21-2.The power-off automatic closing function of electric expansion valve 1 is so achieved that, it is possible thereby to anti-
Only maloperation of the electric expansion valve 1 under powering-off state.
When needing to continue to operate after energization, magnet coil maintaining body 60 is first powered on, and determines iron 63 by magnet coil
Dynamic iron 64 is attracted to and engaged by the magnetic field that maintaining body 60 is produced, so that by main shaft 50, screw shell 22 and needle-valve 23
Lift, so as to pass through aperture of the metering pin valve 23 relative to valve seat 22 again of stepper motor 40.
As shown in figure 12, the modified example of the electric expansion valve 1 according to the present invention is shown.In this variant, with according to this
The difference of above-described embodiment of invention is, in the solenoid housing 61 and stepper motor of magnet coil maintaining body 60
Joint between 40 electric machine casing 41 is provided with the second sealing ring 72, and the magnet coil shell of magnet coil maintaining body 60
The electric machine casing 41 of body 61 and stepper motor 40 is connected together, so as to ensure that magnet coil keeps machine by the second sealing ring 72
Tight seal between the solenoid housing 61 of structure 60 and the electric machine casing 41 of stepper motor 40, and reach IP67 sealings
Grade.Simultaneously the first sealing ring 71, the first sealing ring are provided between the electric machine casing 41 and connector 47 of stepper motor 40
71 realize the electric machine casing 41 and connector 47 and extraneous tight seal of stepper motor 40, so that electric expansion valve 1 reaches
The sealing of grade is sealed to IP67.It is simpler according to this embodiment of the invention in structure, therefore manufacturing cost is lower, together
When also disclosure satisfy that seal request to electric expansion valve 1.
The numerous embodiments of the present invention are described above with reference to Fig. 1-12, but those skilled in the art should understand that originally
Invention is not limited to the embodiment shown in figure, but can have a variety of modifications.For example, solenoid housing 61 and motor
Clamping can be carried out between housing 41 using clip, and sealing ring is set in joint.In addition, Auxiliary support ring 48 and motor casing
Threaded connection between body 41 can also be substituted with clamp connection, and set sealing ring in joint, be equally reached identical
Sealing effectiveness.In addition, can also be substituted according to sealing ring of the present invention using fluid sealant.It is described herein these
Construction can equally realize effect same as the previously described embodiments.
In addition, in the above-described embodiments, main shaft 50 is fixedly connected with rotor 43.Alternately, main shaft 50 can be with
Slideably mode coordinates in rotor 43.So, main shaft 50 can be moved with rotor 43 but will not applied to rotor 43
Plus axial load.On the other hand, can also save in motor component in order to realize rotor with main shaft be moved axially together needed for
Axial space.
The preferred embodiment of the electric expansion valve according to the present invention is made with the property summarized explanation below.
According to another aspect of the present invention, first seal includes the first sealing ring.By with very simple knot
The sealing ring of structure, which can just be realized, seals higher ranked sealing, so as to reduce the manufacturing cost of electric expansion valve.
According to a further aspect of the invention, first seal also includes Auxiliary support ring, and Auxiliary support ring passes through
Threaded connection is engaged with the electric machine casing of stepper motor, and the first sealing ring is arranged on the motor casing of Auxiliary support ring and stepper motor
Joint between body.The bottom of stepper motor can be connected and sealed with the external world, and passed through by Auxiliary support ring
Joint between Auxiliary support ring and electric machine casing sets sealing ring to realize tighter sealing, so that electronics
The sealing grade of expansion valve can reach IP67 grades required in the present invention.
According to the other side of the electric expansion valve of the present invention, it is preferable that Auxiliary support ring passes through its external screw thread and step
Internal thread engagement on the electric machine casing of stepper motor.
In another aspect of the electric expansion valve according to the present invention, in being internally formed towards auxiliary for Auxiliary support ring
The protuberance for helping the center of support ring to protrude, protuberance is used to support the first sealing ring.Set special in the inside of Auxiliary support ring
Door is used for the protuberance for supporting the first sealing ring, can be conducive to making sealing ring keep phase during the use of electric expansion valve
To fixation, so as to provide relatively reliable guarantee for the sealing property of electric expansion valve.
According to the still another aspect of the electric expansion valve of the present invention, Auxiliary support ring includes screwed department of assembly and use
In the drive division for applying driving force to the Auxiliary support ring.Because the Auxiliary support ring according to the embodiment has outside polygon
The drive division in week, therefore help that Auxiliary support ring is installed and fixed by existing instrument.
In the another aspect of the electric expansion valve according to the present invention, the 3rd seal includes threaded seal.
First, threaded seal is easy to process, therefore, it is possible to significantly reduce the manufacturing cost of electric expansion valve；Secondly, band spiral shell
The seal of line has preferable sealing effectiveness, so as to ensure certain sealing property of electric expansion valve.
According to a preferred embodiment of the electric expansion valve of the present invention, wherein, threaded seal includes injection
Nut.Nut is molded on the premise of certain sealing property is ensured, because its structure is relatively simple, therefore, it is possible to effectively
Reduce manufacturing cost.
In the other side of the electric expansion valve according to the present invention, the 3rd seal also includes the 3rd sealing ring, the
Three sealing rings are arranged on the joint between injection nut and the solenoid housing of magnet coil maintaining body.By in screw thread
Sealing ring is set to improve injection nut and electromagnetic wire between the injection nut and magnet coil maintaining body that are bonded together
The sealing engagement enclosed between maintaining body, so as to can reach that IP67 seals grade.
According to the still another aspect of the electric expansion valve of the present invention, use is provided with solenoid housing or injection nut
In the groove of accommodating 3rd sealing ring., can by setting groove on the contact surface of solenoid housing or injection nut
Sealing ring is not shifted over during the use of electric expansion valve, electric expansion valve is kept the operation shape more stablized
State.
According to another aspect of the electric expansion valve of the present invention, wherein, injection nut is formed as cylinder.It is further excellent
Selection of land, is formed with concavo-convex dentalation staggeredly on the outer end of the cylinder of injection nut.Cylinder injection nut is easy to
Processing and manufacturing, and the dentalation formed on cylinder outer end can be conducive to being molded the installation and fastening of nut.
In the still another aspect of the electric expansion valve according to the present invention, injection nut with magnet coil maintaining body
Form fluted on the surface of solenoid housing contact, the cylinder with screwed hole is provided with a groove.It is arranged such
Thread failure of the injection nut in the screwed hole in causing injection nut for some reason or when can not meet seal request,
The main body with screwed hole can be only changed, without changing injection nut main body, therefore, it is possible to cost-effective, is easy to material
Comprehensive utilization.Preferably, cylinder is coordinated in groove by key.The key between cylinder and groove is coordinated to ensure two
Being relatively fixed along the circumferential direction between person, and it is easy to cylinder from the dismounting in groove.
According to the other side of the electric expansion valve of the present invention, second seal includes the second sealing ring.Sealing ring can
With the sealing ring resulted in using in the market, its structure is relatively simple, and sealing ring can realize more tight sealing
Effect.
In another aspect of the electric expansion valve according to the present invention, solenoid housing passes through screw thread with electric machine casing
Connection engagement.The preliminary sealing between solenoid housing and electric machine casing is realized from there through threaded connection, and can be led to
Cross its sealing with the IP67 grades being implemented in combination between solenoid housing and electric machine casing of the second sealing ring.
According to the other side of the electric expansion valve of the present invention, magnet coil maintaining body includes being arranged on magnet coil
The magnet coil of enclosure interior and determine iron and dynamic iron inside magnet coil, the thread head for determining iron extends through electromagnetic wire
The top of housing is enclosed, and is connected through a screw thread and engages with the 3rd seal.It is located at determining inside magnet coil as overall
Iron and dynamic iron can be threadingly attached to the 3rd seal and be bonded together, it is possible thereby to be determine iron and dynamic iron on the whole with electricity
Magnetic coil housing is relatively fixed, and can will determine iron and dynamic iron on the whole from magnet coil shell by dismantling the 3rd seal
Removed on body, be thus easy to that the part inside magnet coil is dismounted and safeguarded.
In the still another aspect of the electric expansion valve according to the present invention, stepper motor also includes determining positioned at stepper motor
Sleeve between son and rotor, rotor can rotate and be axially moved in sleeve.By the sleeve stator can be realized with turning
Relative motion between son, and rotor can be made to be removed on the whole from stator, so as to advantageously be torn open in rotor
Dress and maintenance.Axial movement of the rotor in sleeve can be such that the main shaft being bonded together with rotor in axial direction moves, from
And the hole that needle-valve can be driven to close on valve seat when power is off, so as to avoid losing the control to electric expansion valve during power-off.
In the other side of the electric expansion valve according to the present invention, the valve body of valve member is connected by connector and sleeve
Connect, valve body is also connected by circumferential big nut with connector.Valve body can be connected to herein on stepper motor by connector,
So as to realize effective connection between valve member and needle-valve drive mechanism, the complete shell of electric expansion valve is realized on the whole
Body.The connection of connector and valve body is realized by circumferential big nut, and is able to ensure that certain sealing property.
In the another aspect of the electric expansion valve according to the present invention, between valve body, circumferential big nut and connector
Joint be provided with the 4th seal.The setting of 4th seal can more efficiently keep close between valve body and the external world
Packing is exhausted so that electric expansion valve realizes the sealing property of IP67 grades on the whole.
According to the preferred aspect of the electric expansion valve of the present invention, wherein, the 4th seal includes the 4th sealing ring.Sealing
Coil structures are simple, belong to the standard component that in the market is readily available, therefore, it is possible to realize electronic expansion by part simple and easy to get
Good sealing between the valve body of valve and the external world.
Although the various embodiments of the present invention have been described in detail herein, it should be appreciated that the invention is not limited in this
In the embodiment being described in detail and show, without departing from the spirit and scope of the present invention can be by this area
Technical staff makes various modifications and variations, and all these improvement and modification are both fallen within the claimed scope of the present invention.
Further, all parts being described herein or component can be by the miscellaneous parts being structurally and functionally equal with it
Or component is substituted.
Claims (21)
1. a kind of electric expansion valve (1), including：
For the valve member (20) for the flow for adjusting the fluid for flowing through the electric expansion valve (1)；
The stepper motor (40) of power is provided for the operating mechanism for the valve member (20)；With
Magnet coil maintaining body (60) for providing power-off automatic closing function for the valve member (20),
Wherein, it is provided with the first sealing between the valve member (20) and the electric machine casing (41) of the stepper motor (40)
Part, electric machine casing (41) and the solenoid housing of the magnet coil maintaining body (60) in the stepper motor (40)
(61) second seal is provided between, and it is opposite with the stepper motor (40) in the solenoid housing (61)
End is provided with the 3rd seal.
2. electric expansion valve (1) according to claim 1, wherein, the first seal includes the first sealing ring (71).
3. electric expansion valve (1) according to claim 2, wherein, the first seal also includes Auxiliary support ring
(48), the Auxiliary support ring (48) is connected through a screw thread engages with the electric machine casing (41) of the stepper motor (40), described
First sealing ring (71) is arranged on the joint between the Auxiliary support ring (48) and the electric machine casing (41).
4. electric expansion valve (1) according to claim 3, wherein, the Auxiliary support ring (48) by its external screw thread with
Internal thread engagement on the electric machine casing (41) of the stepper motor (40).
5. electric expansion valve (1) according to claim 4, wherein, in being internally formed for Auxiliary support ring (48)
The protuberance (48-4) protruded towards the center of the Auxiliary support ring (48), the protuberance (48-4) is used to support described the
One sealing ring (71).
6. electric expansion valve (1) according to claim 5, wherein, the Auxiliary support ring (48) includes screwed
Department of assembly (48-1) and the drive division (48-2) for applying driving force to the Auxiliary support ring (48).
7. electric expansion valve (1) according to claim 1, wherein, the 3rd seal includes threaded seal.
8. electric expansion valve (1) according to claim 7, wherein, the threaded seal includes injection nut
(30)。
9. electric expansion valve (1) according to claim 8, wherein, the 3rd seal also includes the 3rd sealing ring
(73), the 3rd sealing ring (73) is arranged on the electromagnetism of the injection nut (30) and the magnet coil maintaining body (60)
Joint between solenoid housing (61).
10. electric expansion valve (1) according to claim 9, wherein, in the solenoid housing (61) or the injection
The groove (69) for housing the 3rd sealing ring (73) is provided with nut (30).
11. electric expansion valve (1) according to claim 8, wherein, the injection nut (30) is formed as cylinder.
12. electric expansion valve (1) according to claim 11, wherein, in the outer of the cylinder for being molded nut (30)
Concavo-convex dentalation staggeredly is formed with end.
13. the electric expansion valve (1) according to claim 11 or 12, wherein, the injection nut (30) with the electricity
Fluted (31) are formed on the surface of solenoid housing (61) contact of magnetic coil maintaining body (60), in the groove (31)
In be provided with the cylinder (32) with screwed hole (33).
14. electric expansion valve (1) according to claim 13, wherein, the cylinder (32) is coordinated described recessed by key
In groove (31).
15. electric expansion valve (1) according to claim 1, wherein, the second seal includes the second sealing ring
(72)。
16. electric expansion valve (1) according to claim 15, wherein, the solenoid housing (61) and the motor
Housing (41) is connected through a screw thread engagement.
17. electric expansion valve (1) according to claim 1, wherein, the magnet coil maintaining body (60) includes setting
Determine iron (63) and dynamic in the internal magnet coil (62) of solenoid housing (61) and positioned at the magnet coil (62) inside
Iron (64), the thread head (63-1) for determining iron (63) extends through the top of the solenoid housing (61), and with
3rd seal is connected through a screw thread engagement.
18. electric expansion valve (1) according to claim 1, the stepper motor (40) also includes being located at stepping electricity
Sleeve (44) between the stator (42) and rotor (43) of machine (40), the rotor (43) can rotate in the sleeve (44)
And axial movement.
19. electric expansion valve (1) according to claim 18, wherein, the valve body (21) of the valve member (20) passes through even
Fitting (47) is connected with the sleeve (44), and the valve body (21) is connected by circumferential big nut (28) and the connector (47)
Connect.
20. electric expansion valve (1) according to claim 19, wherein, in the valve body (21), the circumferential big nut
(28) joint between the connector (47) is provided with the 4th seal.
21. electric expansion valve (1) according to claim 20, wherein, the 4th seal includes the 4th sealing ring
(74)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210403339.7A CN103775717B (en) | 2012-10-22 | 2012-10-22 | Electronic expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210403339.7A CN103775717B (en) | 2012-10-22 | 2012-10-22 | Electronic expansion valve |
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| Publication Number | Publication Date |
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| CN103775717A CN103775717A (en) | 2014-05-07 |
| CN103775717B true CN103775717B (en) | 2017-08-29 |
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| CN201210403339.7A Active CN103775717B (en) | 2012-10-22 | 2012-10-22 | Electronic expansion valve |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653688A (en) * | 2015-03-02 | 2015-05-27 | 余鹏 | Electromagnetic valve capable of electrically controlling flow rate |
| CN106895153A (en) * | 2015-12-19 | 2017-06-27 | 浙江三花智能控制股份有限公司 | Two-period form electric expansion valve |
| US10145594B2 (en) * | 2016-02-03 | 2018-12-04 | Dunan Microstaq, Inc. | Expansion valve |
| CN109869488B (en) | 2017-12-01 | 2021-10-01 | 浙江三花智能控制股份有限公司 | Electronic expansion valve and refrigeration system with same |
| WO2019105454A1 (en) * | 2017-12-01 | 2019-06-06 | 浙江三花智能控制股份有限公司 | Electronic expansion valve and cooling system having same |
| KR102408887B1 (en) * | 2018-01-31 | 2022-06-14 | 저장 산후아 클라이메이트 앤드 어플라이언스 컨트롤스 그룹 컴퍼니 리미티드 | Electric Valve |
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| CN103775717A (en) | 2014-05-07 |
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