CN103883749A - Valve needle assembly and electronic expansion valve comprising same - Google Patents
Valve needle assembly and electronic expansion valve comprising same Download PDFInfo
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- CN103883749A CN103883749A CN201210566191.9A CN201210566191A CN103883749A CN 103883749 A CN103883749 A CN 103883749A CN 201210566191 A CN201210566191 A CN 201210566191A CN 103883749 A CN103883749 A CN 103883749A
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- needle
- force
- needle assembly
- valve
- sleeve
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- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
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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
- 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
-
- 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)
- Lift Valve (AREA)
Abstract
The invention relates to a valve needle assembly comprising a sleeve, a valve needle movably arranged in an end of the sleeve relative to the sleeve, and a force application member arranged in the sleeve and applying a force to the valve needle. Wherein the valve needle assembly further comprises a force transfer assembly disposed between the valve needle and the force applying component. The force transfer assembly is in point contact with the valve needle and the force applying component applies a force to the valve needle through the force transfer assembly. Since the valve needle can move relative to the sleeve and the valve needle bears the acting force applied by the force applying component through the contact point between the force transmission component and the force applying component, the degree of freedom of movement of the valve needle is increased, the valve needle can realize automatic centering with the valve hole in the valve seat, and the sealing performance between the valve needle component and the valve seat can be ensured during the operation process of the electronic expansion valve adopting the valve needle component. And also relates to an electronic expansion valve having such a valve needle assembly.
Description
Technical field
The present invention relates to a kind of needle assembly, particularly a kind of needle assembly with respect to valve seat with automatic centering function, also relates to the electric expansion valve that comprises this needle assembly.
Background technique
Electric expansion valve is the vitals in cooling/heating system, is mainly used in the flow of refrigerant fluid to regulate.In traditional electric expansion valve, conventionally adopt needle to regulate the flow of the fluid that flows through electric expansion valve.In order to realize the fine adjustment to flow, the sealing particular importance between needle and valve seat.
In the operating process of existing electric expansion valve, likely, because the valve opening that is subject to external force or vibrations and makes on needle and the valve seat of needle-valve produces skew, can not fully aim at therefrom, thereby cause the sealability of needle-valve to decline.Sometimes,, because skew or the dislocation of needle and valve opening make to produce friction between needle and valve seat, cause thus the wearing and tearing of needle and valve seat along with the prolongation of service time.In order to avoid the appearance of above-mentioned situation as far as possible, conventionally adopt needle and valve seat that machining accuracy is very high, and also adopted very high assembly precision in the time of assembling.Need to pay high cost but the accuracy of manufacturing of raising needle and valve seat and assembly precision mean, this is that goods producer does not wish to see.Therefore, in prior art, need a kind of needle-valve and the corresponding electric expansion valve that can realize automatic centering function on the basis of not improving existing accuracy of manufacturing and assembly precision.
Summary of the invention
According to one aspect of the invention, a kind of needle assembly is provided, it comprises sleeve, can move and be arranged on the needle in the end of sleeve and be arranged in sleeve and the power that needle applies active force is applied to parts with respect to sleeve.Wherein, needle assembly also comprises and is arranged on needle and power applies the force transfer unit between parts.This force transfer unit contacts with needle point, and power applies parts, by force transfer unit, needle applied to active force.
According to a further aspect in the invention, also provide a kind of electric expansion valve of the valve seat that comprises above-mentioned needle assembly and coordinate with needle assembly, needle assembly coordinates to regulate the flow of the fluid that flows through electric expansion valve with valve seat.
Brief description of the drawings
By the description referring to accompanying drawing, one or more embodiment's of the present invention feature and advantage will more easily be understood.In order to be more clearly shown that, according to the detailed structure of needle assembly of the present invention, each accompanying drawing is not drawn according to actual size ratio, in the accompanying drawings:
Fig. 1 is the sectional view comprising according to the electric expansion valve of needle assembly of the present invention;
Fig. 2 is near the sectional view of the amplification part of B shown in Fig. 1;
Fig. 3 is according to the sectional view of needle assembly of the present invention;
Fig. 4 is the perspective view for the lining of needle assembly according to the present invention;
Fig. 5 is the sectional view of the lining shown in Fig. 4;
Fig. 6 is according to the schematic diagram of the force analysis of the needle assembly tilting with respect to valve seat of the present invention; And
Fig. 7 is according to another embodiment's of needle assembly 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 electric expansion valve that the directional terminology " top " adopting or " top " refer to illustrate or the diagram of needle assembly are the orientation with reference to more close diagram top; And the diagram of the electric expansion valve that directional terminology " below " or " bottom " refer to illustrate or needle assembly is the orientation with reference to more close diagram bottom.
See figures.1.and.2 brief description according to the basic structure of electric expansion valve 10 of the present invention and working principle.As shown in Figure 1, the main working parts of electric expansion valve 10 comprises driven unit and executive module, and driven unit can comprise stepper motor 14 or can comprise stepper motor 14 and the combination of electromagnetic coil 12.The executive module of electric expansion valve 10 comprises the needle assembly 20 being arranged in valve body 30 and the valve seat 31 matching with needle assembly 20.Stepper motor 14 is for controlling the size of aperture of electric expansion valve 10, thereby regulates the flow of the fluid that flows through electric expansion valve 10.Electromagnetic coil 12 for when the power failure for electric expansion valve 10 provides safety protection.In the time of electric expansion valve 10 normal running, fluid flows into the valve pocket of electric expansion valve 10 via the entrance 32 of the electric expansion valve 10 being connected with inflow pipeline 36 from flowing into pipeline 36, fluid in valve pocket is by the matching gap between needle assembly 20 and valve seat 31, then via outlet 34 with export the 34 outflow pipelines 38 that are connected and discharge electric expansion valve 10.
Be provided with in the inside of electric expansion valve 10 with stepper motor 14 along rotating in a circumferential direction the relatively-stationary main shaft 16 of direction, the lower end of main shaft 16 threadably engages with the upper end portion of needle assembly 20, needle assembly 20 is circumferentially non-rotatably arranged in electric expansion valve 10, main shaft 16 can change rotatablely moving of stepper motor 14 into needle assembly 20 move up and down, thereby can modulating valve needle assemblies 20 and valve seat 31 between the size of opening, regulate thus by the flow of the fluid of electric expansion valve 10.Be provided with and determine iron 12-1 and moving iron 12-2 in the inside of the electromagnetic coil 12 of electric expansion valve 10, determining iron 12-1 arranges regularly with respect to electromagnetic coil 12, moving iron 12-2 can arrange with axial motion with respect to electromagnetic coil 12, and moving iron 12-2 can not be connected with axial motion with the end of main shaft 16, but moving iron 12-2 can rotate relatively with main shaft 16.In the time of electric expansion valve 10 normal running, electromagnetic coil 10 switches on power, thereby make moving iron 12-2 and determine iron 12-1 to be bonded together by magnetic force therebetween, thus main shaft 16 is promoted together with needle assembly 20, adjust the distance between needle assembly 20 and valve seat 31 by stepper motor 14.In the time that electric power interrupts suddenly, electromagnetic coil 12 power-off, the magnetic force of determining between iron 12-1 and moving iron 12-2 disappears, and causes both to separate.Main shaft 16 and needle assembly 20 direction to valve seat 31 under the effect of the elastic force of deadweight or spring is moved; make thus needle assembly 20 fully engage with valve seat 31; thereby the fluid that cuts off the entrance 32 of electric expansion valve 10 and export between 34 is communicated with; can, for electric expansion valve 10 provides safety protection in the situation that of power-off suddenly, prevent the misoperation of electric expansion valve 10 thus.From the enlarged view of Fig. 2, can more clearly see the structure of all parts in the valve body 30 of electric expansion valve 10.
Explain according to the structure of needle assembly 20 of the present invention referring to Fig. 3.Needle assembly 20 comprises sleeve 21, in the first cavity 21-1 of sleeve 21, form internal thread, the outside thread of the end by internal thread and main shaft 16 forms screw-thread fit, in the second cavity 21-2 of sleeve 21, be provided with needle 22, as shown in Figure 3, needle 22 is outstanding downwards from the underpart of sleeve 21.Needle 22 remains on by retaining ring 23 in the underpart of sleeve 21, and the top that the cross section of needle 22 expands is resisted against on retaining ring 23, relative being permanently connected together of inwall of retaining ring 23 and sleeve 21.Further, between the circumferential wall contacting with retaining ring 23 of needle 22 and the inner circle wall of retaining ring 23, be Spielpassung, so that needle 22 can relatively be moved in retaining ring 23.Further, between the periphery wall of needle 22 and the inner circle wall of retaining ring 23, there is predetermined gap, needle 22 not only can be slided with respect to retaining ring 23, and can rotate with respect to retaining ring 23 to a certain extent.
Between the first cavity 21-1 of sleeve 21 and the second cavity 21-2, be provided with stepped part 21-3, one end of spring 27 is resisted against on stepped part 21-3, the other end of spring 27 provides needle 22 to be resisted against the pressure on valve seat 31 by the elastic force of spring 27 self, and spring 27 forms the power that applies active force to needle 22 and applies parts.Between spring 27 and needle 22, be also provided with spheroid 24, spheroid 24 is directly resisted against on the top of needle 22, and the elastic force of spring 27 is applied on needle 22 by spheroid 24.Further, spheroid 24 is arranged on by lining 25 in the second cavity 21-2 of sleeve 21, and lining 25 is arranged in the second cavity 21-2 of sleeve 21 regularly.As shown in Figure 4, perspective view for the lining 25 of needle assembly 20 according to the present invention is shown, lining 25 is for having annular solid or other shapes of the 25-1 of hollow chamber, the 25-1 of hollow chamber is circular, its slightly larger in diameter is in the diameter of spheroid 24, thereby spheroid 24 can freely be rolled in the 25-1 of hollow chamber of lining 25.Further, there is the 25-2 of small bore portion at the substructure of the 25-1 of hollow chamber of lining 25, as can be more clearly seen in Fig. 5.The diameter of the 25-2 of small bore portion is less than the diameter of spheroid 24, thereby for spheroid 24 provides certain supporting role, and make spheroid 24 be unlikely to excessively to oppress needle 22.Advantageously, when the 25-2 of small bore portion in lining 25 is arranged so that in spheroid 24 is fully placed on the 25-1 of hollow chamber, be that spheroid 24 was bearing in the 25-2 of small bore portion when upper, the top of spheroid 24 is not higher than the top surface of lining 25, further advantageously, arrange in state above-mentioned, the top of spheroid 24 is lower than the upper surface of lining 25, and has spacing A with the upper surface of lining 25.
In order to ensure the stability of spheroid 24 and the motion of needle 22 in the time that spheroid 24 is exerted pressure to needle 22, between lining 25 and spring 27, be provided with slide block 26, slide block 26 can freely slide in the second cavity 21-2 of sleeve 21, and slide block 26 is enclosed in spheroid 24 in the 25-1 of hollow chamber of lining 25.According to the structure of above-described spheroid 24 and lining 25, be fully contained in lining 25 when interior at spheroid 24, between the top of spheroid 24 and the lower surface of slide block 26, there is spacing A.The effect of following brief description spacing A.At electric expansion valve 10 when state of rest is started working or when being subject to External Force Acting and shaking the operating process of electric expansion valve 10, due to the needle body 22-1 of the needle 22 remaining static or be given a shock likely with valve seat 31 on valve opening produce dislocation, thereby cause the sealability variation between needle 22 and valve seat 31.According to the abovementioned embodiments of the present invention, as shown in Figure 3, if the needle body 22-1 of needle 22 does not aim at completely with the valve opening in valve seat 31, owing to being Spielpassung between needle 22 and retaining ring 23, and there is spacing A between the top of spheroid 24 and slide block 26, therefore needle 22 can move upward with respect to retaining ring 23, or rotates around valve seat 31 and the point of contact of needle 22 further.Because needle 22 moves upward, therefore the face that the top that its cross section expands can depart between retaining ring 23 contacts, thereby make needle 22 can by and spheroid 24 between point contact the rotation and the oscillating motion that realize needle 22, can make thus the automatically centering of valve opening in needle body 22-1 and the valve seat 31 of needle 22.Contact by the point that the plane contact between needle 22 and spring 27 is changed between spheroid 24 and needle 22 at this, thereby can increase the degrees of freedom of the rotation of needle 22, be convenient to thus the centering of the valve opening in needle body 22-1 and the valve seat 31 of needle 22, thereby realize the good sealing between needle 22 and valve seat 31.In addition, due in the time that spheroid 24 is exerted pressure to needle 22, the active force that spheroid 24 applies needle 22, all the time perpendicular to the upper surface of needle 22, therefore can not cause applying to needle 22 due to the out-of-flatness of spring action face in the time that spring 27 acts directly on the upper surface of needle 22 active force of inclination.In the embodiment of needle assembly 20 as above, spheroid 24, lining 25 and slide block 26 are configured for power to apply the force transmission of parts (such as spring 27) to the force transfer unit of needle 22.
Certainly, according to other embodiments of needle assembly 20 of the present invention, force transfer unit can not comprise lining 25 and slide block 26, such as spring 27 can act directly on spheroid 24, now in order to ensure spheroid 24 and the interactional stability of needle 22, the diameter of spheroid 24 is set to the diameter of the second cavity 21-2 of sleeve 21 roughly the same, but spheroid 24 can freely rotate in the second cavity 21-2.In addition,, in needle assembly 20 according to the present invention, force transfer unit can also only include lining 25 and not comprise that slide block 26, the effect end face of spring 27 can act directly on the end face of lining 25 and the top of spheroid 24.The needle assembly 20 so arranging can reach the centering that automatically regulates the needle body 22-1 of needle 22 and the valve opening of valve seat 31 equally, thereby improves the sealability between needle 22 and valve seat 31.In addition, spring 27 also can utilize other elastic members to replace, such as the elastomer that adopts elastic material to make, be arranged on sleeve 21 inwall on spring sheet etc.; In the situation that needs meet other designing requirements, spring 27 can also utilize other power to apply parts and substitute, such as being realized needle 22 is applied to active force by Electromagnetically actuated parts or hydraulically actuated components.Further, spheroid 24 also can replace by other force transmission elements that contact with 22 of needles, such as adopting taper, hemisphere, spheroid and like, only need to ensure between force transmission element and needle 22 as point contacts.Advantageously, point of contact between above-mentioned force transfer unit and needle 22 is positioned at the surperficial center position contacting with force transfer unit of needle 22, will more be conducive under the prerequisite of guaranteeing 20 stable operations of needle assembly for needle 22 provides the active force that makes its swing like this.Certainly, correspondingly, while adopting the force transmission element of other configurations as above, also can make corresponding change for the internal structure of the lining 25 of accommodating force transmission element.
In order to realize the automatic centering of needle 22 on valve seat 31 by spheroid 24, the needle main body 22-2 of needle 22 also should meet certain requirement along the height of its longitudinal axis direction.Referring to Fig. 6 explanation needle 22 according to the present invention realize its automatic centering function on valve seat 31 should be satisfied size requirement.As shown in Figure 6, illustrate that in schematic form needle 22 according to the present invention carries out the free-body diagram of automatic centering under the effect of spheroid 24 taking the point of contact O of needle 22 and valve seat 31 as supporting point, in order to be more shown clearly in the stressing conditions of needle 22, this not according to needle 22 and around the true shape of parts chart.Wherein, spheroid 24 acts on the top of needle 22 by the elastic force of spring 27, and needle 22 produces deflection, and it is by being bearing on valve seat 31 with the point of contact O of valve seat 31.The directed force F that spheroid 24 applies needle 22 has two component F
fand F
n, wherein, F
nfor the contact surface with needle 22 perpendicular to spheroid 24, F
fbe parallel to the contact surface of spheroid 24 and needle 22.Two component F of this of directed force F
fand F
nthe moment that produces respectively the contact O that connects, in order to realize the automatic centering function of needle 22, should meet F
nthe moment producing is greater than F
fthe moment producing, that is:
F
N×L＞F
f×H
Wherein, H is the height of the needle main body 22-2 of needle 22, and L is substantially equal to the radius of the valve opening on valve seat 31, can think that at this L is the radius of valve opening.In addition, F
f=μ × F
n, wherein, μ is the friction factor between spheroid 24 and the top of needle 22.Above-mentioned relation formula is:
L＞μ×H
The height H that can draw needle main body 22-2 from above-mentioned relation formula should meet following relation:
H＜L/μ
In the electric expansion valve 10 having designed, the radius L of the valve opening on valve seat 31 is definite value, at this such as value is L=1.5mm, material and surface flatness that friction factor between the top of spheroid 24 and needle 22 can adopt according to spheroid 24 and needle 22 are determined, be 0.17 in this for example value, the height H that can calculate the needle main body 22-2 of needle 22 should meet H < 8.8mm.In actual use, the height H of needle main body 22-2 can be determined as the case may be, as long as the value of H meets relation H < L/ μ, can realize the automatic centering function of needle 22 on valve seat 31, thereby improve the seal action between needle 22 and valve seat 31.
In addition,, according to another embodiment of needle assembly 20 of the present invention, as shown in Figure 7, the needle 22 that can have a convex upper surface by employing is realized it and is contacted with the point applying to needle 22 between the slide block 26 of active force.To similar according to the embodiment shown in Fig. 3, spring 27 applies active force by being free to slide the slide block 26 being arranged in sleeve 21 to needle 22.Force transmission to the force transfer unit of needle 22 that in this embodiment, power can be applied to parts can only comprise slide block 26.Contact by the point between slide block 26 and the convex upper surface of needle 22, can increase the degrees of freedom of the motion of needle 22, thereby make needle 22 in retaining ring 23, to rotate or to swing, can make thus the automatically centering of valve opening on needle 22 eccentric or that tilt and valve seat 31 occurs, ensure the good seal performance between needle 22 and valve seat 31.Certainly, the above-mentioned convex upper surface of needle 22 can be arranged to arc, spherical, taper and can realize other convex structures that the point between slide block 26 contacts.
Below needle assembly is according to an embodiment of the invention done with recapitulative explanation.
According to needle assembly of the present invention embodiment, needle remains on by retaining ring in the end of sleeve, and needle is arranged in retaining ring in the mode between its periphery wall and the inner circle wall of retaining ring with predetermined gap.
In another embodiment of needle assembly according to the present invention, force transfer unit comprises that the power of being arranged on applies the force transmission element between parts and needle.
According to another embodiment of needle assembly of the present invention, above-mentioned force transmission element is spheroid.
In another embodiment of needle assembly according to the present invention, force transfer unit also comprises and is fixed on the lining for accommodating force transmission element in sleeve.
According to another embodiment of needle assembly of the present invention, lining has for the hollow chamber of accommodating force transmission element and is used to force transmission element that the small bore portion of supporting is provided, and force transmission element can move with respect to lining.
In an also embodiment of needle assembly according to the present invention, in the time that force transmission element is bearing in small bore portion, between the top of force transmission element and the upper surface of lining, there is spacing A.
According to another embodiment of needle assembly of the present invention, force transfer unit further comprises that the power of being arranged on applies the slide block between parts and lining.
In another embodiment of needle assembly according to the present invention, force transmission element is spheroid, and the cross section of hollow chamber is arranged so that spheroid can freely move in hollow chamber, and the diameter of small bore portion is less than the diameter of spheroid.
According to another embodiment of needle assembly of the present invention, sleeve comprises the first cavity and the second cavity, between the first cavity and the second cavity, is formed with stepped part, and power applies parts and is bearing in stepped part.
In another embodiment of needle assembly according to the present invention, it is elastic members that above-mentioned power applies parts.
According to an also embodiment of needle assembly of the present invention, above-mentioned elastic member is spring.
In another embodiment of needle assembly according to the present invention, the point of contact between force transfer unit and needle is positioned at the surperficial center contacting with force transfer unit of needle.
According to another embodiment of needle assembly of the present invention, the height H of the needle main body of needle meets following relation:
H＜L/μ
Wherein, L is the radius of the valve opening on the valve seat coordinating with the needle body of needle, and μ is the friction factor between force transfer unit and needle.
In another embodiment of needle assembly according to the present invention, needle has convex upper surface.
According to an also embodiment of needle assembly of the present invention, force transfer unit comprises that the power of being arranged on applies the slide block between parts and needle.
In another embodiment of needle assembly according to the present invention, above-mentioned convex upper surface has circular shape.
Needle assembly according to the present invention has following advantage, because needle is arranged in the sleeve of needle assembly by the Spielpassung of itself and retaining ring, needle can move with respect to retaining ring, and by force transfer unit, power is applied to the active force that parts apply and act on the upper surface of needle, because the way of contact between force transfer unit and needle is that point contacts, increase thus the degrees of freedom of the motion of needle in sleeve, thereby make needle rotation and/or swing on valve seat under the effect of the force transfer unit contacting with its point, can make the automatically centering of valve opening on needle body and the valve seat of needle, and improve thus the sealability between needle and valve seat, make thus to adopt electric expansion valve safety and the stably operation more of this needle assembly.
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 (18)
1. a needle assembly (20), comprising:
Sleeve (21);
Needle (22), described needle (22) can move and be arranged in the end of described sleeve (21) with respect to described sleeve (21);
Power applies parts, and described power applies parts and is arranged in described sleeve (21), and described needle (22) is applied to active force; With
Force transfer unit, described force transfer unit is arranged on described needle (22) and described power applies between parts, contacts with described needle (22) point, and described power applies parts, by described force transfer unit, described needle (22) is applied to active force.
2. needle assembly as claimed in claim 1 (20), wherein, described needle (22) remains in the end of described sleeve (21) by retaining ring (23), and described needle (22) is arranged in described retaining ring (23) in the mode between its periphery wall and the inner circle wall of described retaining ring (23) with predetermined gap.
3. needle assembly as claimed in claim 1 or 2 (20), wherein, described force transfer unit comprises that being arranged on described power applies the force transmission element between parts and described needle (22).
4. needle assembly as claimed in claim 3 (20), wherein, described force transmission element is spheroid (24).
5. needle assembly as claimed in claim 3 (20), wherein, described force transfer unit also comprises and is fixed on the lining (25) for accommodating described force transmission element in described sleeve (21).
6. needle assembly as claimed in claim 5 (20), wherein, described lining (25) has the hollow chamber (25-1) for accommodating described force transmission element and is used to described force transmission element that the small bore portion (25-2) of supporting is provided, and described force transmission element can move with respect to described lining (25).
7. needle assembly as claimed in claim 6 (20), wherein, in the time that described force transmission element is bearing in described small bore portion (25-2), has spacing (A) between the top of described force transmission element and the upper surface of described lining (25).
8. needle assembly as claimed in claim 7 (20), wherein, described force transfer unit further comprises that being arranged on described power applies the slide block (26) between parts and described lining (25).
9. the needle assembly (20) as described in claim 6 or 7, wherein, described force transmission element is spheroid (24), the cross section of described hollow chamber (25-1) is arranged so that described spheroid (24) can freely move in described hollow chamber (25-1), and the diameter of described small bore portion (25-2) is less than the diameter of described spheroid (24).
10. needle assembly as claimed in claim 1 (20), wherein, described sleeve (21) comprises the first cavity (21-1) and the second cavity (21-2), between described the first cavity (21-1) and described the second cavity (21-2), be formed with stepped part (21-3), described power applies parts and is bearing in described stepped part (21-3).
11. needle assemblies (20) as described in claim 1 or 10, wherein, it is elastic members that described power applies parts.
12. needle assemblies as claimed in claim 11 (20), wherein, described elastic member is spring (27).
13. needle assemblies as claimed in claim 1 (20), wherein, the point of contact between described force transfer unit and described needle (22) is positioned at the surperficial center contacting with described force transfer unit of described needle (22).
14. needle assemblies as claimed in claim 1 (20), wherein, the height H of the needle main body (22-2) of described needle (22) meets following relation:
H＜L/μ
Wherein, L is the radius of the valve opening on the valve seat (31) coordinating with the needle body (22-1) of described needle (22), and μ is the friction factor between described force transfer unit and described needle (22).
15. needle assemblies as claimed in claim 1 (20), wherein, described needle (22) has convex upper surface.
16. needle assemblies as claimed in claim 15 (20), wherein, described force transfer unit comprises that being arranged on described power applies the slide block (26) between parts and described needle (22).
17. needle assemblies (20) as described in claim 15 or 16, wherein, described convex upper surface has circular shape.
18. 1 kinds of electric expansion valves (10), comprise needle assembly (20) as described in any one in claim 1-17 and with as described in needle assembly (20) coordinate with regulate flow through as described in the valve seat (31) of flow of fluid of electric expansion valve (10).
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| CN201210566191.9A CN103883749B (en) | 2012-12-24 | 2012-12-24 | Valve needle assembly and electronic expansion valve comprising same |
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| CN103883749A true CN103883749A (en) | 2014-06-25 |
| CN103883749B CN103883749B (en) | 2016-03-23 |
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| WO2019052570A1 (en) * | 2017-09-18 | 2019-03-21 | 浙江三花智能控制股份有限公司 | Electronic expansion valve |
| CN110454579A (en) * | 2018-05-08 | 2019-11-15 | 艾默生环境优化技术(苏州)有限公司 | Needle component and electric expansion valve with the needle component |
| CN111927389A (en) * | 2016-03-18 | 2020-11-13 | 完成创新有限责任公司 | Method and apparatus for driving downhole casings and other devices |
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|---|---|
| CN103883749B (en) | 2016-03-23 |
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