CN103574062B - Electric expansion valve - Google Patents

Electric expansion valve Download PDF

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Publication number
CN103574062B
CN103574062B CN201210278249.XA CN201210278249A CN103574062B CN 103574062 B CN103574062 B CN 103574062B CN 201210278249 A CN201210278249 A CN 201210278249A CN 103574062 B CN103574062 B CN 103574062B
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CN
China
Prior art keywords
valve
electric expansion
valve body
tapering
expansion valve
Prior art date
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Active
Application number
CN201210278249.XA
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Chinese (zh)
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CN103574062A (en
Inventor
李宁
郑波
梁祥飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
Original Assignee
Gree Electric Appliances Inc of Zhuhai
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Priority to CN201210278249.XA priority Critical patent/CN103574062B/en
Publication of CN103574062A publication Critical patent/CN103574062A/en
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Publication of CN103574062B publication Critical patent/CN103574062B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F16K1/04—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle with a cut-off member rigid with the spindle, e.g. main valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • 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
    • 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
    • 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 provides a kind of electric expansion valve, this electric expansion valve includes: housing；Valve body, is partially disposed in housing, and the first end of valve body is positioned at housing, and the second end of valve body extends housing, and the second end of valve body has valve opening；Two pipe arrangements, two pipe arrangements are both connected on valve body；Control assembly, is arranged in housing；Valve rod, it is located in movably in valve body along valve axis direction, first end of valve rod is connected with control assembly, and the second end of valve rod matches with valve opening, and valve rod has closure valve opening the primary importance making two pipe arrangements be not communicated with and avoidance valve opening the second place making two pipe arrangements communicate；The diameter of valve opening is between 0.8 to 1.2mm, and the diameter of pipe arrangement is between 4 to 6mm.The flow of the electric expansion valve of the present invention is less, is more suitable for the use of R32 cold-producing medium.

Description

Electric expansion valve
Technical field
The present invention relates to expansion valve technical field, in particular to a kind of electric expansion valve.
Background technology
The throttling arrangement using in frequency-conversion air-conditioning system now mostly is electric expansion valve, and the action principle of electric expansion valve is regulation stream Entering the refrigerant amount of evaporimeter, i.e. the liquid supply rate in control system is to ensure to the most suitable refrigerant amount of evaporimeter supply, fully Utilize the area of evaporimeter, it is ensured that the stable operation of refrigeration system.
In the prior art, the valve opening size of electric expansion valve using the domestic air conditioning of R410A cold-producing medium have 1.8mm, 1.6mm, Several specification such as 1.4mm, 1.3mm, the electric expansion valve of these specifications all can occur flow excessive when using R32 cold-producing medium Problem.
Content of the invention
It is desirable to provide a kind of electric expansion valve, the problem excessive to solve flow of electronic expansion valve in prior art.
To achieve these goals, according to an aspect of the invention, it is provided a kind of electric expansion valve, comprising: housing；Valve Body, is partially disposed in housing, and the first end of valve body is positioned at housing, and the second end of valve body extends housing, the of valve body Two ends have valve opening；Two pipe arrangements, two pipe arrangements are both connected on valve body；Control assembly, is arranged in housing；Valve rod, edge Valve axis direction is located in valve body movably, and the first end of valve rod is connected with control assembly, the second end of valve rod and valve opening Matching, valve rod has closure valve opening the primary importance making two pipe arrangements be not communicated with and avoidance valve opening and makes two pipe arrangements communicate The second place；The diameter of valve opening is between 0.8 to 1.2mm, and the diameter of pipe arrangement is between 4 to 6mm.
Further, the second end of valve rod forms needle, and needle includes the first tapering and the second tapering, and the second tapering is arranged on the The outside in one tapering, the height in the first tapering is between 1.4 to 2.4mm, and the scope of first cone angle in the first tapering is at 1 ° extremely Between 5 °.
Further, second cone angle beta in the second tapering is in the range of between 35 ° to 90 °.
Further, it is connected with cylindrical portion between the second tapering and the first tapering.
Further, the second end of valve body is provided with the first radial wall, and the middle part of valve body is provided with the second radial wall, the sidewall of valve body, First radial wall and the second radial wall surround valve chamber, and the first radial wall is provided with valve opening, and the second radial wall is provided with and accommodates valve rod Axially extending bore, one of two pipe arrangements pipe arrangement is connected with valve chamber, and another pipe arrangement in two pipe arrangements be may select by valve opening Ground is connected with valve chamber.
Further, valve body includes valve body body and is arranged on the valve seat of valve body body one end, and valve seat forms the first radial wall.
Further, control assembly to include: magnet rotor, be connected on the inwall of housing；Thread spindle, has external screw thread, screw thread First end of axle is connected with magnet rotor, and the second end of thread spindle has receiving blind hole, and the first end of valve rod is arranged in receiving blind hole； Nut, is spirally connected with thread spindle, and nut is fixedly connected on valve body.
Further, the electric expansion valve of the present invention also includes the first stop assembly, and the first stop assembly includes: apical axis, with shell The roof of body is connected；First spring, is set on apical axis；Alignment pin, L-shaped, including a vertical section and a horizontal segment, Horizontal segment is fixedly connected on thread spindle；Second spring, is set on apical axis, and the first end of the second spring is vertical with alignment pin Section is fixedly linked, and the second end of the second spring is fixed in the intercept groove of the first spring.
Further, the electric expansion valve of the present invention also includes the second stop assembly, and the second stop assembly includes: limited block, if Put in the receiving blind hole of thread spindle；3rd spring, is arranged between limited block and the first end of valve rod.
Further, valve body being provided with the supporting part of support housing, supporting part outer circumferential is connected with the bracket supporting housing.
One skilled in the art will appreciate that, due to R32 good refrigeration effect, molecular weight is low, therefore use the filling of the system of R32 cold-producing medium Fluence is less than the groundwater increment of the system using R410A cold-producing medium, and therefore, the electric expansion valve of the present embodiment is in order to adapt to R32 Cold-producing medium, reduce the diameter dimension of valve opening and pipe arrangement, i.e. the circulation area by reducing electric expansion valve reaches to reduce electronics The purpose of the flow of expansion valve, and then make the electric expansion valve of the present embodiment be more suitable for the use of R32 cold-producing medium, when valve opening Diameter is between 0.8 to 1.2mm, when the diameter of pipe arrangement is between 4 to 6mm, electric expansion valve can be made 0 to 330p's Reach the little effect of circulation area in open range, and make circulation area be controlled effectively in this open range, work as aperture When 330 to 500, the circulation area of electric expansion valve can be tuned up rapidly, to meet the demand of maximum stream flow.
Brief description
A part of Figure of description constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the cross-sectional schematic of the embodiment one of the electric expansion valve of the present invention；
Fig. 2 shows the schematic front view of the needle of the electric expansion valve of Fig. 1；
Fig. 3 shows the cross-sectional schematic of the valve seat of the electric expansion valve of Fig. 1；
What Fig. 4 showed the needle of the electric expansion valve of Fig. 1 and valve seat coordinates schematic diagram；
Fig. 5 shows the relation schematic diagram between the cold medium flux of electric expansion valve and circulation area；
Fig. 6 shows the relation schematic diagram between the valve opening diameter of the electric expansion valve of Fig. 1 and circulation area；
Fig. 7 shows the relation schematic diagram between the height in the first tapering of the electric expansion valve of Fig. 1 and circulation area；
Fig. 8 shows the relation schematic diagram between the first cone angle of the electric expansion valve of Fig. 1 and circulation area；
Fig. 9 shows the relation schematic diagram between the second cone angle beta of the electric expansion valve of Fig. 1 and circulation area；
Figure 10 shows the electric expansion valve of Fig. 1 and the Contrast on effect schematic diagram of the circulation area of electric expansion valve in prior art；
Figure 11 shows the electric expansion valve of Fig. 1 and the Contrast on effect schematic diagram of the air mass flow of electric expansion valve in prior art；
What Figure 12 showed the needle of the embodiment two of the electric expansion valve of the present invention and valve seat coordinates schematic diagram；And
Figure 13 shows the effect schematic diagram of the circulation area of the electric expansion valve of Figure 12.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined. Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Fig. 1 shows the cross-sectional schematic of the embodiment one of the electric expansion valve of the present invention, sees Fig. 1, it can be seen that The electric expansion valve of the present embodiment includes that the 30th, housing the 10th, valve body the 20th, pipe arrangement controls assembly and valve rod 41, wherein, valve body 20 The first end be arranged in housing 10, the second end of valve body 20 extends housing 10, and the second end of valve body 20 has diameter and exists Valve opening 21 between 0.8 to 1.2mm, pipe arrangement 30 is two, and two pipe arrangements are both connected on valve body 20, the diameter of pipe arrangement 30 Between 4 to 6mm.Control assembly is arranged in housing 10, is connected with the first end of valve rod 41, the second end of valve rod 41 Matching with valve opening 21, whole valve rod 41 can move along the axis direction of valve body 20, and valve rod 41 has closure valve opening 21 Primary importance and avoidance valve opening 21 the second place.
One skilled in the art will appreciate that, due to R32 good refrigeration effect, molecular weight is low, therefore use the filling of the system of R32 cold-producing medium Fluence is less than the groundwater increment of the system using R410A cold-producing medium, and therefore, the electric expansion valve of the present embodiment is in order to adapt to R32 Cold-producing medium, reduce the diameter dimension of valve opening 21 and pipe arrangement 30, i.e. the circulation area by reducing electric expansion valve reaches to subtract The purpose of the flow of little electric expansion valve, and then make the electric expansion valve of the present embodiment be more suitable for the use of R32 cold-producing medium, when The diameter of valve opening 21 is between 0.8 to 1.2mm, when the diameter of pipe arrangement 30 is between 4 to 6mm, electric expansion valve can be made to exist Reach the little effect of circulation area in the open range of 0 to 330p, and make circulation area effectively be controlled in this open range System, when aperture is 330 to 500, can tune up rapidly the circulation area of electric expansion valve, to meet the demand of maximum stream flow.
The second end for the ease of valve rod 41 coordinates with valve opening 21, and the second end of valve rod 41 forms needle.As in figure 2 it is shown, Needle includes the first tapering 411 and is arranged on the second tapering 412 outside the first tapering 411, the first tapering 411 and valve body 20 Between be additionally provided with for connect the 3rd tapering, wherein, the height in the first tapering 411 between 1.4 to 2.4mm, and Obtain first cone angle in the first tapering 411 according to formula S=π * h*sin (α/2) * (D-h/2*sin α) between 1 ° to 5 °, wherein S For flow cross-section areas, h is stem lift, and D is valve opening diameter, and α is needle cone angle.Second cone angle beta in the second tapering 412 Tests determined between 35 ° to 90 °, to meet the requirement that electric expansion valve can tune up rapidly under specific circumstances.Such First tapering 411 and the setting in the second tapering 412, can meet the control in a bigger scope of the flow of electric expansion valve.
The electric expansion valve of the present embodiment, the second end at valve body 20 is provided with the first radial wall, and the middle part of valve body 20 is provided with second Radial wall, the sidewall of valve body 20, the first radial wall and the second radial wall surround valve chamber, and the first radial wall is provided with valve opening 21, and Two radial walls are provided with the axially extending bore accommodating described valve rod 41, and the first end of valve rod 41 is fed through through hole, needle and valve opening 21 Coordinating, the setting of through hole and valve opening makes the valve rod 41 can axially moving along valve body 20.One of two pipe arrangements 30 pipe arrangement Connecting with valve chamber, another pipe arrangement 30 is selectively connected with valve chamber by valve opening 21.The setting of valve chamber can be that electronics is swollen Swollen valve carries out the flow-control of cold-producing medium accurately.As shown in Figure 3, it is preferable that valve body 20 includes valve body body and is arranged on valve The valve seat 23 of body body one end, valve seat 23 forms the first radial wall, is provided with and third hand tap near one end of needle at valve opening 21 The mating holes that portion coordinates.Valve body 20 is additionally provided with the supporting part supporting housing 10, is connected with in the outer circumferential of supporting part Support the bracket 48 of housing 10.
The control assembly of the electric expansion valve of the present embodiment includes magnet rotor the 42nd, thread spindle 43 and nut 44, wherein magnet rotor 42 Being connected on the inwall of housing 10, thread spindle 43 has external screw thread, and the first end of thread spindle 43 is connected with magnet rotor 42, spiral shell Second end of line axle 43 has the receiving blind hole accommodating valve rod 41 first end, and the outside of thread spindle 43 is bolted with nut 44, this spiral shell Female 44 are fixedly connected on valve body 20, and when magnet rotor 42 turn-on current, control thread spindle 43 rotates, the spiral shell of rotation It is that thread spindle 43 axially moves along it that line axle 43 coordinates with nut 44, and the motion of thread spindle 43 has driven and thread spindle 43 The motion of the screw rod being connected, makes screw rod can move between primary importance and second, as shown in Figure 4, when needle is positioned at During primary importance, needle blocks valve opening 21, and do not circulate in valve opening 21 cold-producing medium；When needle is positioned at the second place, needle is complete Full avoidance valve opening 21, makes the flow of electric expansion valve reach maximum.
For preventing valve rod 41 from exceeding the second place, the electric expansion valve of the present embodiment also includes two groups of stop assemblies, the first stop group Part includes apical axis the 11st, the first spring the 12nd, alignment pin 13 and the second spring 14, and apical axis 11 is connected with the roof 15 of housing 10, First spring 12 is set on apical axis 11, and alignment pin 13 is L-shaped, including a vertical section and a horizontal segment, horizontal segment is solid Surely it is connected on thread spindle 43；Second spring 14 is set on apical axis 11, and its first end is connected with the vertical end of alignment pin 13, Second end is arranged in the intercept groove of the first spring 12.Second positioning component includes being arranged in the receiving blind hole of thread spindle 43 Limited block 45 and the 3rd spring 46 being arranged between limited block 45 and the first end of valve rod 41.Wherein, the first stop assembly limit The position maximum displacement of threaded rod, maximum displacement, the first stop assembly and second stop of the second stop assembly is spacing valve rod 41 Assembly acts on jointly, prevents valve rod 41 from exceeding the second place.
In embodiment two, the settings that are needle different from above-described embodiment, the needle in embodiment two also includes being arranged on Cylindrical portion 413 between first tapering 411 and the second tapering 412.As shown in figure 12, this set of the second needle so that Needle is when being positioned at the second place, and part cylindrical portion 413 and the second tapering 412 are stayed in valve opening 21, reduce valve opening 21 Circulation area so that the flow of the electric expansion valve of embodiment two is less, and in a bigger scope, flow can be controlled System, is more suitable in some relative complex refrigeration systems (such as Gas-supplying enthalpy-increasing system).
The determination of parameters in the present embodiment is completed by test, and Fig. 6 to Figure 11 shows circulation area and other parameters Between relation, Figure 13 shows the relation between air mass flow and aperture.Rule of thumb formula, has M=CDA(2 ρ Δ P)1/2, wherein, M represents cold medium flux, and A is circulation area, CDFor discharge coefficient, ρ is the density in porch for the refrigerant, Δ P For throttling before and after pressure reduction, wherein the relation between cold medium flux and circulation area is as shown in Figure 5, it is seen that, cold medium flux with The increase of circulation area and increase, therefore, it is desirable to reduce the circulation area that cold medium flux will reduce refrigerant.Fig. 6 to Fig. 9 shows Pipe arrangement 30 diameter, needle height, first cone angle in the first tapering 411 and the second cone angle beta convection current in the second tapering 412 are gone out The impact of logical area, it is known that be the requirement meeting low discharge from figure, and considers reliability and the processes of part Deng factor, being set in the dimension D of valve opening 21 between 0.8mm ~ 1.2mm, the diameter dimension d of pipe arrangement 30 is set in 4mm ~ 6mm Between；For meeting the requirement that low discharge can effectively be controlled by electric expansion valve a bigger scope, needle to have one section of foot The less line style of enough long (1.4≤H≤2.4mm) and the first cone angle；For meeting the requirement that can tune up rapidly when particular case, Second cone angle beta in the second tapering 412 should be bigger.
Figure 10 shows the electric expansion valve in the present embodiment and the Contrast on effect of electric expansion valve of the prior art, wherein D=1.65, α=9 °, H=1.95, β=65 ° and D=1.3, α=7 °, the curve of H=1.75, β=55 ° uses of the prior art Electric expansion valve, D=1.2, α=5 °, H=1.4, β=35 °；D=1.0, α=3 °, H=1.9, β=55 ° and D=0.8, α=1 °, The curve of H=2.4, β=90 ° is the curve of the electric expansion valve in this example, it can be seen that curve D=1.2, α=5 °, H=1.4, During β=35 °, electric expansion valve circulation area is maximum and has minimum scope effectively to regulate flow, and curve is D=1.0, α=3 °, When H=1.9, β=55 °, electric expansion valve circulation area is moderate and has moderate scope effectively to regulate flow, and curve is D=0.8, α=1 °, H=2.4, β=90 ° electric expansion valve circulation area is minimum and has the scope of maximum effectively to regulate flow, in conjunction with on State curve it can be seen that the circulation area of electric expansion valve of the present embodiment is little, can effectively control in the range of 25 to 400p System, and can tune up rapidly in the range of 400 to 500p.Figure 12 shows that in Figure 11, curve is D=1.3, α=7 °, H=1.75, β=55 ° and curve are D=1.0, α=3 °, the air mass flow of H=1.9, β=55 ° and the relation curve of aperture, it is seen then that the present embodiment The air mass flow when aperture is 300 for the electric expansion valve be equivalent to the air mass flow when 100 for the aperture of the prior art, can See that the flow of the electronic expansion of the present embodiment is less and can control effectively low discharge a bigger scope.Figure 13 shows Go out the relation of the circulation area under the line style of the needle of embodiment two and aperture, it is seen that the electric expansion valve of embodiment two meets Flow requirement that is less and that can effectively control flow a bigger scope, meets maximum stream flow simultaneously and requires.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art For, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any modification of being made, etc. With replacement, improvement etc., should be included within the scope of the present invention.

Claims (8)

1. an electric expansion valve, comprising:
Housing (10)；
Valve body (20), is partially disposed in described housing (10), and the first end of described valve body (20) is positioned at described shell In body (10), the second end of described valve body (20) extends described housing (10), the second end of described valve body (20) There is valve opening (21)；
Two pipe arrangements (30), said two pipe arrangement (30) is both connected on described valve body (20)；
Control assembly, is arranged in described housing (10)；
Valve rod (41), in being located in described valve body (20) movably along described valve body (20) axis direction, described valve First end of bar (41) is connected with described control assembly, the second end of described valve rod (41) and described valve opening (21) phase Coordinating, described valve rod (41) has the described valve opening (21) of closure make said two pipe arrangement (30) be not communicated with first Position described valve opening (21) the second place making said two pipe arrangement (30) communicate with avoidance；
It is characterized in that, the diameter of described valve opening (21) between 0.8 to 1.2mm, the internal diameter of described pipe arrangement (30) Between 4 to 6mm, the second end of described valve rod (41) forms needle, and described needle includes the first tapering (411) With the second tapering (412), described second tapering (412) is arranged on the outside of described first tapering (411), and described The height in one tapering (411) between 1.4 to 2.4mm, the scope of the first cone angle of described first tapering (411) Between 1 ° to 5 °, the second cone angle beta of described second tapering (412) is in the range of between 35 ° to 90 °.
2. electric expansion valve according to claim 1, it is characterised in that described second tapering (412) and described first tapering (411) it is connected with cylindrical portion (413) between.
3. electric expansion valve according to claim 1, it is characterised in that the second end of described valve body (20) is provided with the first footpath Xiang Bi, the middle part of described valve body (20) is provided with the second radial wall, the sidewall of described valve body (20), described first radial direction Wall and the second radial wall surround valve chamber, and described first radial wall is provided with described valve opening (21), and described second radial wall sets Having the axially extending bore accommodating described valve rod (41), one of said two pipe arrangement (30) pipe arrangement is connected with described valve chamber Logical, another pipe arrangement in said two pipe arrangement (30) is selectively connected with described valve chamber by described valve opening (21) Logical.
4. electric expansion valve according to claim 3, it is characterised in that described valve body (20) includes valve body body and setting At the valve seat (23) of described valve body body one end, described valve seat (23) forms described first radial wall.
5. electric expansion valve according to claim 1, it is characterised in that described control assembly includes:
Magnet rotor (42), is connected on the inwall of described housing (10)；
Thread spindle (43), has external screw thread, and the first end of described thread spindle (43) is connected with described magnet rotor (42), Second end of described thread spindle (43) has receiving blind hole, and it is blind that the first end of described valve rod (41) is arranged on described receiving Kong Zhong；
Nut (44), is spirally connected with described thread spindle (43), and described nut (44) is fixedly connected on described valve body (20) On.
6. electric expansion valve according to claim 5, it is characterised in that also include the first stop assembly, described first stop Assembly includes:
Apical axis (11), is connected with the roof (15) of described housing (10)；
First spring (12), is set on described apical axis (11)；
Alignment pin (13), L-shaped, including a vertical section and a horizontal segment, described horizontal segment is fixedly connected on described On thread spindle (43)；
Second spring (14), is set on described apical axis (11), and the first end of described second spring (14) is fixed with described The vertical section of position pin (13) is fixedly linked, and the second end of described second spring (14) is fixed on described first spring (12) Intercept groove in.
7. electric expansion valve according to claim 5, it is characterised in that also include the second stop assembly, described second stop Assembly includes:
Limited block (45), is arranged in the receiving blind hole of described thread spindle (43)；
3rd spring (46), is arranged between described limited block (45) and the first end of described valve rod (41).
8. electric expansion valve according to claim 1, it is characterised in that be provided with the described shell of support on described valve body (20) The supporting part of body (10), described supporting part outer circumferential is connected with the bracket (48) supporting described housing (10).
CN201210278249.XA 2012-08-06 2012-08-06 Electric expansion valve Active CN103574062B (en)

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Application Number Priority Date Filing Date Title
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CN103574062B true CN103574062B (en) 2016-10-05

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