CN103775717A - Electronic expansion valve - Google Patents
Electronic expansion valve Download PDFInfo
- Publication number
- CN103775717A CN103775717A CN201210403339.7A CN201210403339A CN103775717A CN 103775717 A CN103775717 A CN 103775717A CN 201210403339 A CN201210403339 A CN 201210403339A CN 103775717 A CN103775717 A CN 103775717A
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- China
- Prior art keywords
- electric expansion
- electromagnetic coil
- expansion valve
- sealing
- stepper motor
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- 238000007789 sealing Methods 0.000 claims abstract description 89
- 230000007246 mechanism Effects 0.000 claims abstract description 36
- 239000012530 fluid Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 79
- 238000001746 injection moulding Methods 0.000 claims description 43
- 229910052742 iron Inorganic materials 0.000 claims description 37
- 230000000153 supplemental effect Effects 0.000 claims description 36
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- 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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B41/30—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
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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
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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)
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
The present invention relates to a kind of electric expansion valve, particularly a kind of electric expansion valve that can realize high sealing grade.
Background technique
Electric expansion valve is the vitals in cooling/heating system, is mainly used in the flow of refrigerant fluid to regulate.Traditional electric expansion valve generally comprises driving mechanism (stepper motor), actuator (thread screw mechanism), throttle mechanism (needle valve seat) and relevant assisting agency.
But traditional electric expansion valve is after power-off, due to thread screw, mechanism loses driving force, so electric expansion valve can not be closed automatically.Therefore, in order to block safely stream, conventionally in the upstream of electric expansion valve or independently electromagnetic switch valve of one of downstream tandem, it typically is normally close valve, in the time powering up, open and close in the time of power-off.Like this, in the time of system cut-off, electromagnetic switch valve will close to block stream automatically.
But, adopt structure as above, on the one hand due to increased by one independently electromagnetic switch valve increased the overall cost of system, on the other hand for this electromagnetic switch valve of connecting, to in pipeline, increase by two soldering points (, the entrance and exit place of electromagnetic switch valve), the risk that this has not only increased the assembly cost of system but also has increased system leak.
It is to provide standby power supply for electric expansion valve that another kind is realized the method that electric expansion valve automatically closes after power-off, for example in the control panel of electric expansion valve, increase super capacitor or installation reserve battery for storage of electrical energy, but this method also increases the cost of electric expansion valve and has needed more complicated controller.
In addition, the electric expansion valve that can realize high sealing grade (for example IP67 sealing grade) in prior art only comprises stepper motor or electromagnetic valve coil, not yet occurs not only comprising stepper motor but also comprises the electric expansion valve that can realize the high-protection level that power-off closes automatically of electromagnetic valve coil.
The present invention proposes a kind of electric expansion valve that can automatically close after power-off, and this solenoid valve can be realized higher sealing grade, such as realizing IP67 sealing grade, thereby this electric expansion valve be can be used in the higher applied environment of sealing class requirement.
Summary of the invention
An one or more embodiments' of the present invention object is to provide a kind of electric expansion valve that can use in the environment higher to seal request, conventionally can reach IP67 sealing grade.
Another object of one or more mode of executions of the present invention is to provide a kind of electric expansion valve that can automatically close under powering-off state.
Another object of one or more mode of executions of the present invention is to provide a kind of electric expansion valve by comparatively simple seal combination realization with good seal performance.
One or more to achieve these goals, according to one aspect of the invention, provide a kind of electric expansion valve, and it comprises: for regulating the valve member of flow of the fluid that flows through electric expansion valve; Be used to the operating device of valve member that the stepper motor of power is provided; Be used to valve member that the electromagnetic coil retaining mechanism of power-off automatic closing function is provided, wherein, between valve member and the electric machine casing of stepper motor, be provided with the first Sealing, between the electric machine casing of stepper motor and the electromagnetic coil housing of electromagnetic coil retaining mechanism, be provided with the second Sealing, and be provided with the 3rd Sealing in the end contrary with stepper motor of electromagnetic coil housing.
By the first Sealing being set between the valve member at electric expansion valve and the electric machine casing as the stepper motor of power driving part, the 3rd Sealing is set arranging between the electric machine casing of stepper motor and the electromagnetic coil housing of electromagnetic coil retaining mechanism on the second Sealing and contrary another end with stepper motor at electromagnetic coil housing, thereby the position that may be in communication with the outside at electric expansion valve all forms tight sealing, thus the workpiece of electric expansion valve is all sealed in its housing, and make it reach higher sealing grade, such as reaching IP67 sealing grade, thereby electric expansion valve according to the present invention be can be used in the comparatively severe situation of Environmental Conditions.In addition, can also provide power-off automatic closing function according to electric expansion valve of the present invention, prevent that electric expansion valve from the out of control situation due to power-off occurring in the course of the work.
Accompanying drawing explanation
By the description referring to accompanying drawing, will more easily understand one or more embodiment's of the present invention feature and advantage, wherein:
Fig. 1 is the perspective view according to electric expansion valve of the present invention;
Fig. 2 is the sectional view of the electric expansion valve shown in Fig. 1 in original state;
Fig. 3 is the partial enlarged drawing at the electromagnetic coil retaining mechanism place of the electric expansion valve shown in Fig. 2;
Fig. 4 is the partial enlarged drawing at the stepper motor place of the electric expansion valve shown in Fig. 2;
Fig. 5 is for according to the three-dimensional cutaway view of the electromagnetic coil of electric expansion valve of the present invention;
Fig. 6 is for according to the section plan of the electromagnetic coil of electric expansion valve of the present invention;
Fig. 7 is for according to the three-dimensional cutaway view of the injection moulding nut of electric expansion valve of the present invention;
Fig. 8 is for according to the section plan of the stator of the stepper motor of electric expansion valve of the present invention;
Fig. 9 is for according to the stereogram of the supplemental support ring of electric expansion valve of the present invention;
Figure 10 is for according to the section plan of the supplemental support ring of electric expansion valve of the present invention;
Figure 11 is the sectional view of the electric expansion valve shown in Fig. 1 in normal regulating state; And
Figure 12 is according to the second embodiment's of electric expansion valve of the present invention sectional view.
Embodiment
Description of preferred embodiments is only exemplary below, and is never the restriction to the present invention and application or usage.
In the process that embodiments of the invention are described, the directional terminology " top " adopting or " top " refer to illustrate that the diagram of electric expansion valve and constituent elements thereof is the orientation with reference to more close diagram top; And directional terminology " below " or " bottom " refer to illustrate that the diagram of electric expansion valve and constituent elements thereof is the orientation with reference to more close diagram bottom.
First illustrate according to the electric expansion valve with high sealing grade 1 of the first embodiment of the present invention and the structure of constituent elements thereof with reference to accompanying drawing 1-11.
Fig. 1 is the three-dimensional structure diagram illustrating according to the electric expansion valve with high sealing grade 1 of the first embodiment of the present invention, the stepper motor 40 that electric expansion valve 1 comprises valve member 20, rotate for the Shi Gai actuator of actuator of actuating valve parts 20 and for keeping and the electromagnetic coil retaining mechanism 60 of the actuator of relief valve parts 20, wherein, valve member 20 is for the flow of the fluid that flows through electric expansion valve 1 is regulated, thereby according to the refrigerant fluid of demand supplies certain flow rate.
Explain according to the structure of electric expansion valve 1 of the present invention referring to accompanying drawing 2-4.Valve member 20 comprises valve body 21, on valve body 21, be provided with flow into entrance 21-1 that pipeline 11 is connected and with the outlet 21-2 that flows out pipeline 12 and be connected.Outlet 21-2 place at valve body 21 is provided with valve seat 22, and the top of the valve seat 22 in valve body 21 is formed with for containing fluid and plays the valve pocket 21-3 of decompression.Electric expansion valve 1 also comprises the needle-valve 23 that can coordinate to regulate with valve seat 22 flow of the fluid that flows through valve member 20.Needle-valve 23 is driven by actuator, and actuator is driven and kept by stepper motor 40 and electromagnetic coil retaining mechanism 60.
The actuator of needle-valve 23 comprises main shaft 50 and the ut socket 24 with main shaft 50 screw-thread fit, wherein ut socket 24 is engaged in the through hole in valve body 21 slidably, but ut socket 24 can not rotate with respect to valve body 21, needle-valve 23 is fixed on the end of ut socket 24 by retaining ring 26.Ut socket 24 has superposed little inside diameter and is positioned at the large diameter portion of bottom, in little inside diameter, be provided with internal thread, for coordinating with the outside thread on the second end 50-2 of main shaft 50, thereby rotatablely moving of main shaft 50 converted to the axial motion of ut socket 24.In the large diameter portion of ut socket 24, be provided with spring 25, one end of spring 25 is resisted against in the stepped part of the interface between large diameter portion and little inside diameter, and the other end of spring 25 is resisted against on the upper end portion of needle-valve 23.Spring 25 will apply elastic force from one end of needle 23 so that have suitablely for power between another effect end of needle 23 and valve seat 22, and this has protected needle 23 and valve seat 22 not damaged on the one hand, and reliable sealing effect is provided on the other hand.
For the better sealing effect of needle-valve 23 with respect to the opening on valve seat 22 is provided, can on the end coordinating with valve seat 22 of needle 23, be provided with can be against the sealing ring 23-1 of the end face of valve seat 22, in preferred embodiment according to the present invention, sealing ring 23-1 is arranged on the effect end of needle-valve 23 around needle-valve 23.
The second end 50-2 of the upper end portion of ut socket 24 and main shaft 50 is slidably arranged in the through hole of the second block 46, and is provided with spring 27 between the outside of ut socket 24 stepped part and the lower end surface of the second block 46.Spring 27 can move downward for ut socket 24 provides auxiliary nut sleeve 24, needle 23 and main shaft 50 in the situation of downward spring force electric expansion valve 1 power-off to describe in the back, makes thus needle 23 move to the position of closing the opening on valve seat 22.It will be understood by those skilled in the art that, because ut socket 24, needle 23 and main shaft 50 itself have certain deadweight, its deadweight can be for providing this power moving downward, therefore spring 27 is omissible.
Preferably, electric expansion valve 1 according to the present invention is also provided with the restricting means of the excessive rotation of restriction main shaft 5.This restricting means comprises the stop rod 53 being arranged on regularly on the second block 46, the helical guideway 54 relatively arranging regularly around main shaft 50 and the slider 55 sliding on helical guideway 54.In main shaft 50 process that drive nut sleeve 24 and needle-valve 23 move downward rotatably; slider 55 stops and can not jointly rotate with main shaft 50 owing to being stopped bar 53; and therefore move downward along helical guideway 54; in the time that slider 55 moves to the flange end face on main shaft 50 (the larger part of diameter on main shaft 50); can not continue to move downward; thereby stop rotatablely moving of main shaft 50; stop thus the continuation rotation of the rotor of stepper motor 40, thereby protection needle-valve 23 and valve seat 22 are avoided damaging.That can adjust main shaft 50 by longitudinal effective length of adjusting color screw guide rail 54 can confined rotating range.
The first end 50-1 of main shaft 50 and the electromagnetic coil retaining mechanism 60 of electric expansion valve 1 are bonded together.Electromagnetic coil retaining mechanism 60 comprises electromagnetic coil housing 61, be arranged in the yoke 65 at electromagnetic coil housing 61 center, be arranged on the electromagnetic coil 62 in the periphery of yoke 65 and be arranged on the iron core in the inner chamber of yoke 65, and yoke 65 is arranged in electromagnetic coil housing 61 regularly by upper gasket 66 and lower gasket 67.Iron core is arranged on by cylindrical sleeve 68 in the inner chamber of yoke 65, iron core comprises determines iron 63 and moving iron 64, determine in inner chamber that iron 63 is arranged on yoke 65 regularly, and maintain static with respect to cylindrical sleeve 68, moving iron 64 is arranged in cylindrical sleeve 68, the first end of cylindrical sleeve 68 with determine iron 63 and be fixed together, together with its relative the second end is permanently connected with the first block 45, moving iron 64 can activate by electromagnetic coil 62 is carried out to control system of switching on or off electricity, thereby makes moving iron 64 in the interior slip of cylindrical sleeve 68.
Moving iron 64 engages in the mode that can rotate but can not move to axial with the first end 50-1 of main shaft 50.Particularly, can engage by rolling component known in the art first end 50-1 and the moving iron 64 of main shaft 50, for example, by ball bearing or needle bearing.Like this, in the time that the rotor 43 of stepper motor 40 drives main shaft 50 to rotate, moving iron 64 can not rotate with it, thereby makes moving iron 64 and determine adhesive between iron 63 more firm.And in the time that electromagnetic coil retaining mechanism 60 removes electricity, moving iron 64 can in axial direction motion 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 can be rotatably set in sleeve 44, together with the other end of sleeve 44 is permanently connected with the second block 46 by link 47, link 47 links together with valve body 21 by circumferential big nut 28.
Can realize the sealing protection performance of IP67 grade in order to make electric expansion valve 1 according to the present invention, first need between the bottom of the electric machine casing of stepper motor 40 41 and the external world, realize tight seal, in the bottom of the electric machine casing 41 of stepper motor 40, the first Sealing is set for this reason.According to preferred embodiment of the present invention, be provided with supplemental support ring 48 in the inside of electric machine casing 41, supplemental support ring 48 is bonded together with the internal thread 41-2 being arranged in the bottom of electric machine casing 41 of stepper motor 40 by outside thread 48-3 on it is set, as more clearly seen in Fig. 2, Fig. 4, Fig. 8, Fig. 9 and Figure 10.At the supplemental support ring 48 for electric expansion valve 1 according to the present invention shown in Fig. 9 and 10.As shown in the figure, supplemental support ring 48 comprises the 48-1 of department of assembly for being assembled to electric machine casing 41 and for supplemental support ring 48 being applied in assembly process the drive portion 48-2 of driving force, on the peripheral part of the 48-1 of department of assembly, be formed with the outside thread 48-3 engaging with the internal thread 41-2 in electric machine casing 41, and be formed with the protuberance 48-4 outstanding towards its center in the inside of the 48-1 of department of assembly.When on the electric machine casing 41 that supplemental support ring 48 is installed to stepper motor 40, sleeve 44 in the contiguous stepper motor 40 of protuberance 48-4, and be provided with the first seal ring 71 at supplemental support ring 48 and the junction point of the electric machine casing 41 of stepper motor 40, the first seal ring 71 is pressed against tightly by protuberance 48-4 between electric machine casing 41, supplemental support ring 48 and sleeve 44 threes of stepper motor 40, thereby realize the bottom of electric expansion valve 1 and extraneous tight seal, and make sealing effect reach IP67 sealing grade.
In addition, in order to realize the tight seal between electromagnetic coil housing 61 and the electric machine casing 41 of stepper motor 40, conventionally between electromagnetic coil housing 61 and the electric machine casing 41 of stepper motor 40, be provided with the second Sealing.According to preferred embodiment of the present invention, electromagnetic coil housing 61 is arranged to be threaded with electric machine casing 41, on one of them, be provided with internal thread, on another, be provided with outside thread.In embodiment shown in the drawings according to the present invention, preferably, be provided with internal thread 61-1 in the inside of electromagnetic coil housing 61, as shown in Figure 6, on the electric machine casing 41 of stepper motor 40, be provided with the outside thread 41-1 engaging with the internal thread 61-1 on electromagnetic coil housing 61, as shown in Figure 8 simultaneously.Be threaded and can keep the good sealing between electric machine casing 41 and the electromagnetic coil housing 61 of stepper motor 40.In order to realize the further sealing between electric machine casing 41 and the electromagnetic coil housing 61 of stepper motor 40, in the connecting part of between, be provided with the second seal ring 72, be threadably engaged and seal ring is sealed in the sealing that has realized IP67 sealing grade between the electric machine casing 41 of stepper motor 40 and electromagnetic coil housing 61.In preferred embodiment according to the present invention, junction point between that the second seal ring 72 is arranged on electric machine casing 41 and the top of electromagnetic coil housing 61 adjacency and the inwardly projecting perisporium of electromagnetic coil housing 61, that is to say, the second seal ring 72 is arranged to the inside with the more close electric expansion valve 1 of threadedly engaged portions of electromagnetic coil housing 61 with respect to electric machine casing 41.In addition, the second seal ring 72 also can arrange the junction point further from the inside of electric expansion valve 1 with respect to threadedly engaged portions between the two of electric machine casing 41 and electromagnetic coil housing 61, and this set of the second seal ring 72 can be realized IP67 between electric machine casing 41 and electromagnetic coil housing 61 and seal the protection effect of grade equally.Further preferably, can on the end face that the second seal ring 72 is set of the electric machine casing of stepper motor 40 41, form circumferential convex 41-3, as shown in Figure 8, circumferentially convex 41-3 can provide supporting role for the second seal ring 72, for keeping the relatively-stationary position of the second seal ring 72.
Further, in order to realize the tight seal between electromagnetic coil housing 61 and the external world of electric expansion valve 1, on the top of electromagnetic coil housing 61, be provided with the 3rd Sealing.In preferred embodiment according to the present invention, on the top of electromagnetic coil housing 61, be provided with injection moulding nut 30, and be formed with circumferential recess 69 on the surface contacting with injection moulding nut 30 at the top of electromagnetic coil housing 61, as shown in Figure 3, Figure 5 and Figure 6, for being contained in the 3rd seal ring 73 that forms tight seal between electromagnetic coil housing 61 and injection moulding nut 30.As shown in Figure 7, injection moulding nut 30 is formed as cylindrical body to the concrete structure of injection moulding nut 30, is formed with concavo-convex staggered dentation structure, thereby is convenient to being screwed of injection moulding nut 30 on cylindrical top.On the surface contacting with electromagnetic coil housing 61 of injection moulding nut 30, be formed with groove 31, be preferably cylindrical groove, be provided with the cylinder 32 that is threaded hole 33 in the inside of groove 31.Cylinder 32 is bonded together regularly by the barrel portion of known Placement and injection moulding nut 30, such as, cylinder 32 coordinates by the key and the groove structure that lay respectively on groove 31 and cylinder 32, realizes thus between the two relatively fixing along circumferential direction.In the time that injection moulding nut 30 is installed on electromagnetic coil housing 61, together with tapped hole 33 in cylinder 32 is screwedly mounted on the screw column 63-1 on the top of determining iron 63, thereby injection moulding nut 30 is securely fixed on the electromagnetic coil housing 61 of electromagnetic coil retaining mechanism 60 of electric expansion valve 1, and realize the tight seal of injection moulding nut 30 and electromagnetic coil housing 61 by the 3rd seal ring 73 being contained in the groove 69 on electromagnetic coil housing 61 tops, and make it reach IP67 sealing grade.Although the groove 69 of explanation is formed on the top surface of electromagnetic coil housing 61 herein, groove 69 also can be formed on the surface engaging with electromagnetic coil housing 61 of injection moulding nut 30, can reach equally identical sealing effect.In addition, although the tapped hole 33 in injection moulding nut 30 is formed in the cylinder 32 in the groove 31 that is placed in injection moulding nut 30 in this embodiment, also tapped hole 33 can be formed directly in injection moulding nut 30, can simplify thus the structure of injection moulding nut, thereby reduce its manufacture cost.
In addition, in the time that electric expansion valve 1 according to the present invention does not have electromagnetic coil retaining mechanism 60, can injection moulding nut 30 and electric machine casing 41 be joined directly by the structure of the electric machine casing 41 of change injection moulding nut 30 and/or stepper motor 40, match such as the shape and size of injection moulding nut 30 being modified as with the part with outside thread 41-1 of electric machine casing 41, or the part with outside thread 41-1 of electric machine casing 41 can be modified as with the helical thread portion of injection moulding nut 30 and adapt.Meanwhile, the office, joining portion of between is provided with the 3rd seal ring 73, for guaranteeing the tight seal between electric machine casing 41 and the external world, makes it reach IP67 sealing grade.
In the assembly process of electric expansion valve 1, can be first will be arranged on the moving iron 64 in cylindrical sleeve 68 and determine iron 63, be arranged on rotor 43 in sleeve 44 and the first block 45 and the second block 46, main shaft 50 and valve body 21 and inner associated components thereof and be arranged on the outside supplemental support ring 48 of lower end of sleeve 44 and link 47 is assembled into the core component of electric expansion valve 1; Then electromagnetic coil housing 61 is threaded connection and is fitted together with the electric machine casing 41 of stepper motor 40, and be provided with the 3rd seal ring 73 at both junction points; Then the core component of electric expansion valve 1 that supplemental support ring 48 and the first seal ring 71 are installed can be assembled in the electronic expansion valve chest that electromagnetic coil housing 61 and electric machine casing 41 form, the screw column 63-1 that makes to determine on the top of iron 63 reaches outside the top of electromagnetic coil housing 61; The second seal ring 72 is held in place in the groove 69 at top of electromagnetic coil housing 61 subsequently, and injection moulding nut 30 is screwed on the screw column 63-1 that determines iron 63; Finally supplemental support ring 48 is screwed in the electric machine casing 41 of stepper motor 40, the first seal ring 71 is pressed against between the circumferential wall, the outer side wall of cylindrical sleeve 44 and the protuberance 48-4 of supplemental support ring 48 that inwardly give prominence to of electric machine casing 41.Form thus the good sealing of electric expansion valve 1 by being threaded of three seal rings and corresponding position thereof, and make sealability reach IP67 sealing grade.
Following brief description is according to the working procedure of electric expansion valve 1 of the present invention.As shown in Figure 2, for the original state of electric expansion valve 1, now electromagnetic coil 62 switches on power, the magnetic field that moving iron 64 produces by electromagnetic coil 62 with determine iron 63 and be pulled together securely, in this original state, the rotor 43 of stepper motor 40 not yet starts to rotate, and the underpart of needle-valve 23 is resisted against on valve seat 22, thereby the fluid of having blocked the entrance 21-1 of electric expansion valve 1 and export between 21-2 is communicated with, and therefore, now electric expansion valve 1 is in closed condition.
In the time stepper motor 40 being operated by operation equipment, the rotor 43 of stepper motor 40 rotates, thereby drives main shaft 50 to rotate.Rotatablely moving of main shaft 50 converts the axial motion of ut socket 24 to by the screw-thread fit between its second end 50-2 and ut socket 24.In the starting stage, rotatablely moving of main shaft 50 should convert axially moving upward of ut socket 24 to, thereby make ut socket 24 drive needle-valve 23 in axial direction to move upward together, make thus the underpart of needle-valve 23 away from valve seat 22, between the entrance 21-1 therefore allowing at valve body 21 and outlet 21-2, form fluid and be communicated with.Now, electric expansion valve 1 is in normal working as shown in figure 11.In the time need to regulating the flow of electric expansion valve 1, only need the rotation of control step motor 40, distance between end and valve seat 22 that can metering pin valve 23, thus the flow of the fluid in the hole in valve seat 22 is flow through in adjusting, namely regulates the flow of electric expansion valve 1.
In the time needing to continue operation after energising, first electromagnetic coil retaining mechanism 60 switches on, determining magnetic field that iron 63 produces by electromagnetic coil retaining mechanism 60 will move iron 64 and be attracted to and engage, thereby main shaft 50, screw shell 22 and needle-valve 23 are mentioned, thus can by stepper motor 40 again metering pin valve 23 with respect to the aperture of valve seat 22.
As shown in figure 12, illustrate according to the modified example of electric expansion valve 1 of the present invention.In this modified example, be with difference according to the abovementioned embodiments of the present invention, junction point between the electromagnetic coil housing 61 of electromagnetic coil retaining mechanism 60 and the electric machine casing 41 of stepper motor 40 is provided with the second seal ring 72, and the electromagnetic coil housing 61 of electromagnetic coil retaining mechanism 60 is connected together with the electric machine casing 41 of stepper motor 40, thereby guarantee the tight seal between the electromagnetic coil housing 61 of electromagnetic coil retaining mechanism 60 and the electric machine casing 41 of stepper motor 40 by the second seal ring 72, and make it reach IP67 sealing grade.Simultaneously between the electric machine casing 41 of stepper motor 40 and link 47, be provided with the first seal ring 71, the first seal ring 71 has been realized the electric machine casing 41 of stepper motor 40 and link 47 and extraneous tight seal, thereby makes electric expansion valve 1 reach the sealing of IP67 sealing grade.Structurally simpler according to this embodiment of the invention, therefore manufacture cost is lower, also can meet the seal request to electric expansion valve 1 simultaneously.
Describe numerous embodiments of the present invention above with reference to Fig. 1-12, but those skilled in the art should understand that the present invention is not limited to the mode of execution shown in figure, but can have multiple modification.For example, between electromagnetic coil housing 61 and electric machine casing 41, can adopt clip to carry out clamping, and at junction point, seal ring is set.In addition, being threaded between supplemental support ring 48 and electric machine casing 41 also can substitute with clip connected, and at junction point, seal ring is set, and can reach equally identical sealing effect.In addition, also can adopt sealer to be substituted according to seal ring of the present invention.These structures described herein can be realized effect same as the previously described embodiments equally.
In addition, in the above-described embodiments, main shaft 50 is fixedly connected with rotor 43.Alternately, main shaft 50 can be engaged in rotor 43 in mode slidably.Like this, main shaft 50 can still can not apply axial load to rotor 43 with rotor 43 motions.On the other hand, also can save in motor component in order to realize rotor with the required axial space of main shaft axial motion.
Below to doing the property summarized explanation according to the preferred embodiment of electric expansion valve of the present invention.
According to another aspect of the present invention, the first Sealing comprises the first seal ring.Just can realize the sealing of higher grade of sealing by thering is the seal ring of very simple structure, thereby can reduce the manufacture cost of electric expansion valve.
According to a further aspect of the invention, the first Sealing also comprises supplemental support ring, supplemental support ring is threaded connection with the electric machine casing of stepper motor and engages, and the first seal ring is arranged on the junction point between supplemental support ring and the electric machine casing of stepper motor.The underpart of stepper motor and the external world can be connected and sealed by supplemental support ring, can realize tighter sealing and seal ring is set by the junction point between supplemental support ring and electric machine casing, thereby make the sealing grade of electric expansion valve can reach desired IP67 grade in the present invention.
According to another aspect of electric expansion valve of the present invention, preferably, supplemental support ring engages by the internal thread on the electric machine casing of its outside thread and stepper motor.
In aspect another of electric expansion valve of the present invention, be formed with in the inside of supplemental support ring towards the outstanding protuberance in supplemental support Huan center, protuberance is used for supporting the first seal ring.Inside at supplemental support ring arranges the protuberance that is specifically designed to supporting the first seal ring, can in the using process of electric expansion valve, be conducive to make seal ring to keep relatively fixing, thereby guarantee for the sealability of electric expansion valve provides more reliably.
According to an also aspect of electric expansion valve of the present invention, supplemental support ring comprises screwed department of assembly and for described supplemental support circulating application being added to the drive portion of driving force.Owing to thering is the drive portion of polygonal periphery according to this embodiment's supplemental support ring, therefore contribute to by existing instrument, supplemental support ring is installed and fixed.
In aspect another of electric expansion valve of the present invention, the 3rd Sealing comprises threaded Sealing.First, threaded Sealing is easy to processing, therefore can reduce significantly the manufacture cost of electric expansion valve; Secondly, threaded Sealing has good sealing effect, thereby can guarantee certain sealability of electric expansion valve.
According to electric expansion valve of the present invention preferred embodiment, wherein, threaded Sealing comprises injection moulding nut.Injection moulding nut, under the prerequisite of guaranteeing certain sealability, because its structure is relatively simple, therefore can reduce manufacture cost effectively.
In aspect another of electric expansion valve of the present invention, the 3rd Sealing also comprises the 3rd seal ring, and the 3rd seal ring is arranged on the junction point between injection moulding nut and the electromagnetic coil housing of electromagnetic coil retaining mechanism.By between injection moulding nut together and electromagnetic coil retaining mechanism, seal ring being set and can improving the sealing engagement between injection moulding nut and electromagnetic coil retaining mechanism being threadedly engaged with, thereby can reach IP67 sealing grade.
According to an also aspect of electric expansion valve of the present invention, on electromagnetic coil housing or injection moulding nut, be provided with the groove for accommodating the 3rd seal ring.By groove being set on the contact surface at electromagnetic coil housing or injection moulding nut, can make seal ring not be shifted in the using process of electric expansion valve, make electric expansion valve keep more stable running state.
According to another aspect of electric expansion valve of the present invention, wherein, injection moulding nut is formed as cylindrical body.Further preferably, on the cylindrical outer end of injection moulding nut, be formed with concavo-convex staggered dentation structure.Cylindrical body injection moulding nut is convenient to manufacturing, and is formed on dentation structure on cylindrical body outer end and can be conducive to the installation of injection moulding nut and fastening.
According to electric expansion valve of the present invention also aspect one in, on the surface contacting with electromagnetic coil housing electromagnetic coil retaining mechanism injection moulding nut, be formed with groove, in groove, be provided with the cylinder with tapped hole.When the thread failure of the injection moulding nut so arranging in the tapped hole making for some reason in injection moulding nut maybe can not meet seal request, can only change the main body with tapped hole, and without changing injection moulding nut main body, therefore can be cost-saving, be convenient to the comprehensive utilization of material.Preferably, cylinder is engaged in groove by key.Be engaged in key between cylinder and groove and not only can guarantee between the two along the circumferential direction relative fixing, and be convenient to cylinder from the dismounting in groove.
According to another aspect of electric expansion valve of the present invention, the second Sealing comprises the second seal ring.Seal ring can adopt the seal ring that can obtain on market, and its structure is comparatively simple, and seal ring can be realized comparatively tight sealing effect.
In aspect another of electric expansion valve of the present invention, electromagnetic coil housing is threaded connection and engages with electric machine casing.Be threaded connection thus the preliminary sealing realizing between electromagnetic coil housing and electric machine casing, and can realize by the combination of itself and the second seal ring the sealing of the IP67 grade between electromagnetic coil housing and electric machine casing.
According to another aspect of electric expansion valve of the present invention, electromagnetic coil retaining mechanism comprise be arranged on the electromagnetic coil of electromagnetic coil enclosure interior and be positioned at electromagnetic coil inside determine iron and moving iron, the thread head of determining iron extends through the top of electromagnetic coil housing, and is threaded connection and engages with the 3rd Sealing.As a whole be positioned at determining iron and moving iron and can being threaded connection in the 3rd Sealing and being bonded together of electromagnetic coil inside, can be that to determine iron and moving iron relatively fixing with electromagnetic coil housing on the whole thus, and can remove from electromagnetic coil housing on the whole determining iron and moving iron by dismantling the 3rd Sealing, be convenient to thus the parts of electromagnetic coil inside to carry out dismounting and maintenance.
According to electric expansion valve of the present invention also aspect one in, stepper motor also comprises the sleeve between stator and the rotor of stepper motor, rotor can rotate and axial motion in sleeve.Can realize the relative movement between stator and rotor by this sleeve, and can make rotor from stator, shift out on the whole, thereby more be conducive to rotor to carry out dismounting and maintenance.The axial motion of rotor in sleeve can make the main shaft being bonded together with rotor in axial direction move, thereby can in the time of power-off, drive needle-valve to close the hole on valve seat, thereby while avoiding power-off, loses the control to electric expansion valve.
In aspect another of electric expansion valve of the present invention, the valve body of valve member is connected with sleeve by link, and valve body is also connected with link by circumferential big nut.Can valve body be connected on stepper motor by link at this, thereby realize effective connection the between valve member and needle-valve driving mechanism, realize on the whole the complete housing of electric expansion valve.Realize being connected of link and valve body by circumferential big nut, and can guarantee certain sealability.
In aspect another of electric expansion valve of the present invention, the junction point between valve body, circumferentially big nut and link is provided with the 4th Sealing.The sealing that can more effectively keep between valve body and the external world that arranges of the 4th Sealing completely cuts off, and makes electric expansion valve realize on the whole the sealability of IP67 grade.
According to the preferred aspect of electric expansion valve of the present invention, wherein, the 4th Sealing comprises the 4th seal ring.Ring structure is simple, belongs on market the standard piece easily obtaining, and therefore can realize the good sealing between valve body and the external world of electric expansion valve by parts simple and easy to get.
Although described various mode of execution of the present invention in detail at this; but should be appreciated that the present invention is not limited to the embodiment of describing in detail and illustrating here; in the situation that not departing from the spirit and scope of the invention, can make various modifications and variations by those skilled in the art, all these improve and modification all falls in the claimed scope of the present invention.Further, all parts of describing in this article or member can be substituted by the miscellaneous part being equal to it on 26S Proteasome Structure and Function or member.
Claims (21)
1. an electric expansion valve (1), comprising:
Flow through the valve member (20) of the flow of the fluid of described electric expansion valve (1) for adjusting;
Be used to the operating device of described valve member (20) that the stepper motor (40) of power is provided; With
Be used to described valve member (10) that the electromagnetic coil retaining mechanism (60) of power-off automatic closing function is provided,
Wherein, between described valve member (20) and the electric machine casing (41) of described stepper motor (40), be provided with the first Sealing, between the electric machine casing (41) of described stepper motor (40) and the electromagnetic coil housing (61) of described electromagnetic coil retaining mechanism (60), be provided with the second Sealing, and be provided with the 3rd Sealing in the end contrary with described stepper motor (40) of described electromagnetic coil housing (61).
2. electric expansion valve according to claim 1 (1), wherein, described the first Sealing comprises the first seal ring (71).
3. electric expansion valve according to claim 2 (1), wherein, described the first Sealing also comprises supplemental support ring (48), described supplemental support ring (48) is threaded connection with the electric machine casing (41) of described stepper motor (40) and engages, and described the first seal ring (71) is arranged on the junction point between described supplemental support ring (48) and described electric machine casing (41).
4. electric expansion valve according to claim 3 (1), wherein, described supplemental support ring (48) engages by the internal thread on the electric machine casing (41) of its outside thread and described stepper motor (40).
5. electric expansion valve according to claim 4 (1), wherein, be formed with the protuberance (48-4) outstanding towards the center of described supplemental support ring (48) in the inside of described supplemental support ring (48), described protuberance (48-4) is for supporting described the first seal ring (71).
6. electric expansion valve according to claim 5 (1), wherein, described supplemental support ring (48) comprises screwed department of assembly (48-1) and for described supplemental support ring (48) being applied to the drive portion (48-2) of driving force.
7. electric expansion valve according to claim 1 (1), wherein, described the 3rd Sealing comprises threaded Sealing.
8. electric expansion valve according to claim 7 (1), wherein, described threaded Sealing comprises injection moulding nut (30).
9. electric expansion valve according to claim 8 (1), wherein, described the 3rd Sealing also comprises the 3rd seal ring (73), and described the 3rd seal ring (73) is arranged on the junction point between described injection moulding nut (30) and the electromagnetic coil housing (61) of described electromagnetic coil retaining mechanism (60).
10. electric expansion valve according to claim 9 (1) wherein, is provided with the groove (69) for accommodating described the 3rd seal ring (73) on described electromagnetic coil housing (61) or described injection moulding nut (30).
11. electric expansion valves according to claim 8 (1), wherein, described injection moulding nut (30) is formed as cylindrical body.
12. electric expansion valves according to claim 11 (1) wherein, are formed with concavo-convex staggered dentation structure on the cylindrical outer end of described injection moulding nut (30).
13. according to the electric expansion valve described in claim 11 or 12 (1), wherein, on the surface contacting with electromagnetic coil housing (61) described electromagnetic coil retaining mechanism (60) described injection moulding nut (30), be formed with groove (31), in described groove (31), be provided with the there is tapped hole cylinder (32) of (33).
14. electric expansion valves according to claim 13 (1), wherein, described cylinder (32) is engaged in described groove (31) by key.
15. electric expansion valves according to claim 1 (1), wherein, described the second Sealing comprises the second seal ring (72).
16. electric expansion valves according to claim 15 (1), wherein, described electromagnetic coil housing (61) is threaded connection and engages with described electric machine casing (41).
17. electric expansion valves according to claim 1 (1), wherein, described electromagnetic coil retaining mechanism (60) comprise be arranged on the inner electromagnetic coil (62) of electromagnetic coil housing (61) and be positioned at described electromagnetic coil (62) inside determine iron (63) and moving iron (64), the described thread head (63-1) of determining iron (63) extends through the top of described electromagnetic coil housing (61), and is threaded connection and engages with described the 3rd Sealing.
18. electric expansion valves according to claim 1 (1), described stepper motor (40) also comprises the sleeve (44) between stator (42) and the rotor (41) that is positioned at described stepper motor (40), and described rotor (41) can rotate and axial motion in described sleeve (44).
19. electric expansion valves according to claim 18 (1), wherein, the valve body (21) of described valve member (20) is connected with described sleeve (44) by link (47), and described valve body (21) is connected with described link (47) by circumferential big nut (28).
20. electric expansion valves according to claim 19 (1), wherein, the junction point between described valve body (21), described circumferential big nut (28) and described link (28) is provided with the 4th Sealing.
21. electric expansion valves according to claim 20 (1), wherein, described the 4th Sealing comprises the 4th seal ring (74).
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| CN201210403339.7A CN103775717B (en) | 2012-10-22 | 2012-10-22 | Electronic expansion valve |
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| CN201210403339.7A CN103775717B (en) | 2012-10-22 | 2012-10-22 | Electronic expansion valve |
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| CN103775717A true CN103775717A (en) | 2014-05-07 |
| CN103775717B CN103775717B (en) | 2017-08-29 |
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| 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 |
| CN107036341A (en) * | 2016-02-03 | 2017-08-11 | 盾安美斯泰克股份有限公司 | Improved expansion valve |
| 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 |
| CN111417807A (en) * | 2018-01-31 | 2020-07-14 | 浙江三花制冷集团有限公司 | Electric valve and manufacturing method thereof |
| US11168804B2 (en) | 2017-12-01 | 2021-11-09 | Zhejiang Sanhua Intelligent Controls Co., Ltd. | Electronic expansion valve and cooling system having same |
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