CN103883749B - 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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- CN103883749B CN103883749B CN201210566191.9A CN201210566191A CN103883749B CN 103883749 B CN103883749 B CN 103883749B CN 201210566191 A CN201210566191 A CN 201210566191A CN 103883749 B CN103883749 B CN 103883749B
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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 6
- 238000000429 assembly Methods 0.000 claims description 6
- 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
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit 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
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process 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
- 230000002093 peripheral effect Effects 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
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
Landscapes
- 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 relative to valve seat with automatic centering function, also relates to the electric expansion valve comprising this needle assembly.
Background technique
Electric expansion valve is the vitals in cooling/heating system, is mainly used in regulating the flow of refrigerant fluid.In traditional electric expansion valve, the flow of needle to the fluid flowing through electric expansion valve is usually adopted to regulate.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 owing to being subject to external force or vibrations and making the valve opening on the needle of needle-valve and valve seat produce offseting, can not fully aiming at therefrom, thus the sealability of needle-valve is caused to decline.Sometimes, because the skew of needle and valve opening or dislocation make to produce between needle and valve seat to rub, the wearing and tearing of needle and valve seat are caused thus along with the prolongation of service time.In order to avoid the appearance of above-mentioned situation as far as possible, usually adopt the needle that machining accuracy is very high and valve seat, and also use very high assembly precision when assembling.But the accuracy of manufacturing of raising needle and valve seat and assembly precision mean and need to pay high cost, and this is that goods producer does not wish to see.Therefore, need in prior art a kind of can realize automatic centering function on the basis of not improving existing accuracy of manufacturing and assembly precision needle-valve and corresponding electric expansion valve.
Summary of the invention
According to one aspect of the invention, provide a kind of needle assembly, it comprises sleeve, can the needle in the end of sleeve be arranged on moving relative to sleeve and be arranged in sleeve and parts are applied to the power that needle applies active force.Wherein, needle assembly also comprises the force transfer unit being arranged on needle and power and applying between parts.This force transfer unit and needle point cantact, power applies parts and applies active force by force transfer unit to needle.
According to a further aspect in the invention, also provide a kind of electric expansion valve of the valve seat comprising above-mentioned needle assembly and coordinate with needle assembly, needle assembly coordinates the flow to regulate the fluid flowing through electric expansion valve with valve seat.
Accompanying drawing explanation
By the description referring to accompanying drawing, will more easily understand the feature and advantage of one or more embodiment of the present invention.In order to clearly illustrate the detailed construction according to 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 of the electric expansion valve comprised according to needle assembly of the present invention;
Fig. 2 is the sectional view of the amplification near part B shown in Fig. 1;
Fig. 3 is the sectional view according to needle assembly of the present invention;
Fig. 4 is the perspective view of the lining for needle assembly according to the present invention;
Fig. 5 is the sectional view of the lining shown in Fig. 4;
Fig. 6 is the schematic diagram of the force analysis according to the needle assembly relative to valve seat inclination of the present invention; And
Fig. 7 is the sectional view of another embodiment according to needle assembly of the present invention.
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 be described embodiments of the invention, the directional terminology " top " adopted or " top " refer to the diagram of electric expansion valve or the needle assembly illustrated for reference is closer to the orientation at diagram top; And directional terminology " below " or " bottom " refer to the diagram of electric expansion valve or the needle assembly illustrated for reference is closer to the orientation bottom diagram.
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 the combination of stepper motor 14 and electromagnetic coil 12.The executive module of electric expansion valve 10 comprises the needle assembly 20 be arranged in valve body 30 and the valve seat 31 matched with needle assembly 20.Stepper motor 14 for controlling the size of the aperture of electric expansion valve 10, thus regulates the flow flowing through the fluid of electric expansion valve 10.Electromagnetic coil 12 for when power failure for electric expansion valve 10 provides safety protection.When 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 be connected with feed line 36 from feed line 36, fluid in valve pocket, by matching gap between needle assembly 20 and valve seat 31, then discharges electric expansion valve 10 via outlet 34 and the outflow lines 38 that is connected with outlet 34.
Be provided with in the inside of electric expansion valve 10 and the stepper motor 14 circumferentially relatively-stationary main shaft 16 of sense of rotation, the lower end of main shaft 16 threadably engages with the upper end portion of needle assembly 20, needle assembly 20 circumference is non-rotatably arranged in electric expansion valve 10, the converting rotary motion of stepper motor 14 can be moving up and down of needle assembly 20 by main shaft 16, thus can the size of opening between modulating valve needle assemblies 20 and valve seat 31, regulate the flow of the fluid by electric expansion valve 10 thus.Be provided with in the inside of the electromagnetic coil 12 of electric expansion valve 10 and determine iron 12-1 and dynamic iron 12-2, determine iron 12-1 to arrange regularly relative to electromagnetic coil 12, dynamic iron 12-2 can be arranged with axial motion relative to electromagnetic coil 12, and dynamic iron 12-2 can not be connected with axial motion with the end of main shaft 16, but dynamic iron 12-2 can rotate relatively with main shaft 16.When electric expansion valve 10 normal running, electromagnetic coil 10 switches on power, thus make dynamic 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, by the distance between stepper motor 14 regulating valve needle assemblies 20 and valve seat 31.When electric power interrupts suddenly, electromagnetic coil 12 power-off, the magnetic force determined between iron 12-1 and dynamic iron 12-2 disappears, and causes both to be separated.Main shaft 16 and needle assembly 20 move to the direction of valve seat 31 under the effect of the elastic force of deadweight or spring; needle assembly 20 is made fully to engage with valve seat 31 thus; thus the entrance 32 cutting off electric expansion valve 10 is communicated with the fluid exported between 34; when unexpected power-off for electric expansion valve 10 provides safety protection, the misoperation of electric expansion valve 10 can be prevented thus.The structure of all parts in the valve body 30 of electric expansion valve 10 more clearly can be seen from the enlarged view of Fig. 2.
The structure according to needle assembly 20 of the present invention is explained referring to Fig. 3.Needle assembly 20 comprises sleeve 21, internal thread is formed in the first cavity 21-1 of sleeve 21, screw-thread fit is formed by the outside thread of the end of internal thread and main shaft 16, needle 22 is provided with in the second cavity 21-2 of sleeve 21, as shown in Figure 3, needle 22 is given prominence to downwards from the underpart of sleeve 21.Needle 22 remains in the underpart of sleeve 21 by retaining ring 23, and the top that the cross section of needle 22 expands is resisted against on retaining ring 23, and retaining ring 23 is relative with the inwall of sleeve 21 to be permanently connected together.Further, be Spielpassung between the circumferential wall contacted with retaining ring 23 of needle 22 and the inner circle wall of retaining ring 23, relatively can move in retaining ring 23 to make needle 22.Further, between the periphery wall of needle 22 and the inner circle wall of retaining ring 23, there is predetermined gap, needle 22 can not only be slided relative to retaining ring 23, and can rotate relative to retaining ring 23 to a certain extent.
Stepped part 21-3 is provided with between the first cavity 21-1 and the second cavity 21-2 of sleeve 21, 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 pressure on valve seat 31 by the elastic force of spring 27 self, and spring 27 forms the power applying 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 in the second cavity 21-2 of sleeve 21 by lining 25, and lining 25 is arranged in the second cavity 21-2 of sleeve 21 regularly.As shown in Figure 4, the perspective view of the lining 25 for needle assembly 20 according to the present invention is shown, lining 25 is for having annular solid or other shapes of hollow chamber 25-1, hollow chamber 25-1 is circular, its diameter slightly larger than the diameter of spheroid 24, thus makes spheroid 24 freely can roll in the hollow chamber 25-1 of lining 25.Further, there is small bore portion 25-2 at the substructure of the hollow chamber 25-1 of lining 25, as can be more clearly seen in Figure 5.The diameter of small bore portion 25-2 is less than the diameter of spheroid 24, thus provides certain supporting role for spheroid 24, and makes spheroid 24 be unlikely to excessively to oppress needle 22.Advantageously, small bore portion 25-2 in lining 25 is arranged so that when spheroid 24 is fully placed in hollow chamber 25-1, namely when spheroid 24 is bearing on small bore portion 25-2, 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 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 the motion of spheroid 24 and needle 22 when spheroid 24 pairs of needles 22 apply pressure, slide block 26 is provided with between lining 25 and spring 27, slide block 26 freely can slide in the second cavity 21-2 of sleeve 21, and spheroid 24 is enclosed in the hollow chamber 25-1 of lining 25 by slide block 26.According to the structure of above-described spheroid 24 and lining 25, when spheroid 24 is fully contained in lining 25, 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.When being subject to External Force Acting and vibrations occur when electric expansion valve 10 started working from state of rest or the operating process of electric expansion valve 10, needle body 22-1 due to the needle 22 remained static or be given a shock likely produces with the valve opening on valve seat 31 and misplaces, thus causes the sealability between needle 22 and valve seat 31 to be deteriorated.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, then 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 relative to retaining ring 23, or rotates around the point of contact of valve seat 31 and 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, thus make needle 22 can be realized rotation and the oscillating motion of needle 22 by the point cantact between spheroid 24, the valve opening automatically centering in the needle body 22-1 of needle 22 and valve seat 31 can be made thus.At this by the plane contact between needle 22 and spring 27 being changed into the point cantact between spheroid 24 and needle 22, thus the degrees of freedom of the rotation of needle 22 can be increased, be convenient to the centering of the valve opening in the needle body 22-1 of needle 22 and valve seat 31 thus, thus realize the good sealing between needle 22 and valve seat 31.In addition, due to when spheroid 24 pairs of needles 22 apply pressure, the active force that the spheroid 24 pairs of needles 22 apply all the time perpendicular to the upper surface of needle 22, therefore can not due to when spring 27 acts directly on the upper surface of needle 22 spring action face out-of-flatness and cause the active force applying inclination to needle 22.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 transfer unit of force transmission to needle 22 of parts (such as spring 27).
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 roughly the same with the diameter of the second cavity 21-2 of sleeve 21, but spheroid 24 freely can 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 slide block 26, and 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 of setting like this can reach the centering automatically regulating the needle body 22-1 of needle 22 and the valve opening of valve seat 31 equally, thus improves the sealability between needle 22 and valve seat 31.In addition, spring 27 also can utilize other elastic members to replace, such as adopt elastic material make elastomer, be arranged on sleeve 21 inwall on spring sheet etc.; When other designing requirements of demand fulfillment, spring 27 can also utilize other power to apply parts and substitute, and such as can realize applying active force to needle 22 by Electromagnetically actuated parts or hydraulically actuated components.Further, spheroid 24 also by replacing with other force transmission elements of needle 22 point cantact, such as can adopt taper, hemisphere, spheroid and like, only needs to ensure that between force transmission element and needle 22 be point cantact.Advantageously, point of contact between above-mentioned force transfer unit with needle 22 is positioned at the center position on the surface contacted with force transfer unit of needle 22, like this by advantageously under the prerequisite guaranteeing needle assembly 20 stable operation for needle 22 provides the active force making it swing.Certainly, correspondingly, when adopting the force transmission element of other configurations as above, the internal structure for the lining 25 of accommodating force transmission element also can make corresponding change.
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 in its longitudinal axis direction.Referring to Fig. 6, the size requirement that needle 22 according to the present invention realizes its automatic centering function on valve seat 31 and should meet is described.As shown in Figure 6, illustrate in schematic form needle 22 according to the present invention under the effect of spheroid 24 with the point of contact O of needle 22 and valve seat 31 for supporting point performs the free-body diagram of automatic centering, in order to more be shown clearly in the stressing conditions of needle 22, do not chart according to the true shape of needle 22 and peripheral parts thereof at this.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 pairs of needles 22 apply has two component F
fand F
n, wherein, F
nfor the contact surface perpendicular to spheroid 24 and needle 22, F
fbe parallel to the contact surface of spheroid 24 and needle 22.These two component F of directed force F
fand F
nproducing the moment of the contact O that connects respectively, in order to realize the automatic centering function of needle 22, should F be met
nthe moment produced is greater than F
fthe moment produced, 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 L is the radius of valve opening at this.In addition, F
f=μ × F
n, wherein, μ is the friction factor between the top of spheroid 24 and needle 22.Above-mentioned relation formula is:
L＞μ×H
Can show that from above-mentioned relation formula the height H of needle main body 22-2 should meet following relation:
H＜L/μ
In the electric expansion valve 10 designed, the radius L of the valve opening on valve seat 31 is definite value, be L=1.5mm in this such as value, the material that friction factor between the top of spheroid 24 and needle 22 can adopt according to spheroid 24 and needle 22 and surface flatness are determined, be 0.17 in this such as value, then 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, the automatic centering function of needle 22 on valve seat 31 can be realized, thus 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, can by the point cantact adopting the needle 22 with convex upper surface to realize between itself and the slide block 26 applying active force to needle 22.Similar to the embodiment according to Fig. 3, spring 27 applies active force by the slide block 26 that can slidably be arranged in sleeve 21 to needle 22.In this embodiment, the force transmission that power can be applied parts can only comprise slide block 26 to the force transfer unit of needle 22.By the point cantact between slide block 26 and the convex upper surface of needle 22, the degrees of freedom of the motion of needle 22 can be increased, thus make needle 22 to rotate in retaining ring 23 or to swing, can make thus needle 22 that is eccentric or that tilt and the valve opening automatically centering on valve seat 31 occur, 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 of the point cantact between slide block 26.
Below needle assembly is according to an embodiment of the invention done with recapitulative explanation.
According to an embodiment of needle assembly of the present invention, needle remains in the end of sleeve by retaining ring, and needle is arranged in retaining ring in the mode between its periphery wall and inner circle wall of retaining ring with predetermined gap.
In another embodiment of needle assembly according to the present invention, force transfer unit comprises the force transmission element be arranged between power applying 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 the lining be fixed on 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 with for providing the small bore portion of supporting for force transmission element, and force transmission element can move relative to lining.
In an also embodiment of needle assembly according to the present invention, when 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 comprises the slide block be arranged between power applying parts and lining further.
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 freely can move in hollow chamber, and the diameter in 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, be 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 with needle is positioned at the center on the surface contacted 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 that coordinates 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 the slide block be arranged between power applying 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 relative to retaining ring, and power applied by force transfer unit 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 point cantact, thereby increase the degrees of freedom of the motion of needle in sleeve, thus make needle rotate on valve seat under the effect of the force transfer unit with its point cantact and/or swing, the valve opening automatically centering on the needle body of needle and valve seat can be made, and the sealability hence improved between needle and valve seat, make thus to adopt the electric expansion valve of this needle assembly more safely and stably to operate.
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 described in detail and illustrate here; can make various modifications and variations by those skilled in the art when not departing from the spirit and scope of the invention, all these improve and modification all falls in the claimed scope of the present invention.Further, all parts of describing in this article or component can be substituted by the miscellaneous part be equal to it on 26S Proteasome Structure and Function or component.
Claims (15)
1. a needle assembly (20), comprising:
Sleeve (21);
Needle (22), described needle (22) can be arranged in the end of described sleeve (21) relative to described sleeve (21) with moving;
Power applies parts, and described power applies parts and is arranged in described sleeve (21), applies active force to described needle (22); With
Force transfer unit, described force transfer unit is arranged on described needle (22) and described power applies between parts, with described needle (22) point cantact, described power applies parts and applies active force by described force transfer unit to described needle (22)
It is characterized in that, described force transfer unit comprises the lining (25) being arranged on described power and applying the force transmission element between parts and described needle (22) and be fixed on for accommodating described force transmission element in described sleeve (21), described lining (25) has for the hollow chamber (25-1) of accommodating described force transmission element with for providing the small bore portion (25-2) of supporting for described force transmission element, and described force transmission element can move relative to described lining (25).
2. needle assembly (20) as claimed in claim 1, 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 (20) as claimed in claim 1, wherein, described force transmission element is spheroid (24).
4. needle assembly (20) as claimed in claim 1, wherein, when described force transmission element is bearing on described small bore portion (25-2), between the top of described force transmission element and the upper surface of described lining (25), there is spacing (A).
5. needle assembly (20) as claimed in claim 4, wherein, described force transfer unit comprises the slide block (26) be arranged between described power applying parts and described lining (25) further.
6. the needle assembly (20) as described in claim 1 or 4, wherein, described force transmission element is spheroid (24), the cross section of described hollow chamber (25-1) is arranged so that described spheroid (24) freely can 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).
7. needle assembly (20) as claimed in claim 1, wherein, described sleeve (21) comprises the first cavity (21-1) and the second cavity (21-2), between described first cavity (21-1) and described second cavity (21-2), be formed with stepped part (21-3), described power applies parts and is bearing in described stepped part (21-3).
8. the needle assembly (20) as described in claim 1 or 7, wherein, it is elastic members that described power applies parts.
9. needle assembly (20) as claimed in claim 8, wherein, described elastic member is spring (27).
10. needle assembly (20) as claimed in claim 1, wherein, the point of contact between described force transfer unit with described needle (22) is positioned at the center on the surface contacted with described force transfer unit of described needle (22).
11. needle assemblies (20) as claimed in claim 1, 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) that coordinates with the needle body of described needle (22) (22-1), and μ is the friction factor between described force transfer unit and described needle (22).
12. needle assemblies (20) as claimed in claim 1, wherein, described needle (22) has convex upper surface.
13. needle assemblies (20) as claimed in claim 12, wherein, described force transfer unit comprises the slide block (26) be arranged between described power applying parts and described needle (22).
14. needle assemblies (20) as described in claim 12 or 13, wherein, described convex upper surface has circular shape.
15. 1 kinds of electric expansion valves (10), comprise needle assembly (20) as described in any one in claim 1-14 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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| CN201210566191.9A CN103883749B (en) | 2012-12-24 | 2012-12-24 | Valve needle assembly and electronic expansion valve comprising same |
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| CN103883749B true CN103883749B (en) | 2016-03-23 |
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| GB2566370B (en) * | 2016-03-18 | 2021-09-01 | Completion Innovations Llc | Method and apparatus for actuation of downhole sleeves and other devices |
| CN207213305U (en) * | 2017-09-18 | 2018-04-10 | 浙江三花智能控制股份有限公司 | Electric 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 |
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| CN1869482A (en) * | 2005-05-27 | 2006-11-29 | 株式会社不二工机 | Motor-operated valve |
| CN101788073A (en) * | 2009-01-22 | 2010-07-28 | 株式会社不二工机 | Mortor operated valve |
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| CN102650336A (en) * | 2011-02-24 | 2012-08-29 | 株式会社不二工机 | Electric valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3330832B2 (en) * | 1996-11-28 | 2002-09-30 | 太平洋工業株式会社 | Electric valve |
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| CN1869482A (en) * | 2005-05-27 | 2006-11-29 | 株式会社不二工机 | Motor-operated valve |
| CN101788073A (en) * | 2009-01-22 | 2010-07-28 | 株式会社不二工机 | Mortor operated valve |
| CN102252120A (en) * | 2010-05-21 | 2011-11-23 | 浙江三花股份有限公司 | Heat exchange device, and electrically operated valve thereof |
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