CN110454579A

CN110454579A - Needle component and electric expansion valve with the needle component

Info

Publication number: CN110454579A
Application number: CN201810432862.XA
Authority: CN
Inventors: 陈亮
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2018-05-08
Filing date: 2018-05-08
Publication date: 2019-11-15

Abstract

The present invention relates to needle component and the electric expansion valve with the needle component.In one aspect, a kind of needle component is provided comprising valve rod, needle, elastic element and stop configurations.Needle couples with valve rod, can be relative to valve rod axially movable.Elastic element is arranged between valve rod and needle.Stop configurations are configured to limit needle relative to valve rod axially movable, to prevent needle from opening the valve opening of electric expansion valve in advance under the active force of fluid.On the other hand, a kind of electric expansion valve is provided comprising needle component according to the present invention.By needle component according to the present invention and electric expansion valve, it can prevent electric expansion valve from opening in advance under fluid matasomatism and interior leakage occurs, it is ensured that can accurately control the fluid flow for flowing through electric expansion valve under forward condition and reverse state.In addition, the electric expansion valve is provided with balance channel, can effectively balanced valve needle assemblies stress.

Description

Needle component and electric expansion valve with the needle component

Technical field

The present invention relates to a kind of needle component and a kind of electric expansion valves with the needle component.

Background technique

The content of this part provides only background information related to the present invention, may not constitute the prior art.

Electric expansion valve is the important component in refrigeration system, is adjusted for the flow to working fluid.Electronics is swollen Swollen valve generally includes driving mechanism, throttle mechanism and relevant auxiliary body.Driving mechanism generally include stepper motor and Corresponding thread screw mechanism, throttle mechanism includes needle component and valve seat.In traditional electric expansion valve, usual stepping electricity Machine and thread screw mechanism directly drive needle component, to open or close electric expansion valve, to realize convection current The flow for crossing the fluid of electric expansion valve is adjusted.To guarantee the reliable efficient operation of refrigeration system, electric expansion valve needs effective Guarantee its basic performance and reliability.

Currently, needle component mainly uses two kinds of design schemes: rigid connection design scheme and flexible connection design scheme.

Rigidly connected needle component mainly uses the rigid connections such as interference by the correlated parts (example in needle component Such as valve rod and needle) be linked and packed together with.Figures 1 and 2 show that a kind of rigidly connected needle component M of prior art. Needle component M includes valve rod M1, needle M2 and sealing element M3.The upper end of valve rod M1 is provided with threaded hole M11, with connection pair The drive rod that needle component M is driven, for example, the drive shaft (not shown) of motor.The lower end of valve rod M1 is provided with recess portion M12.The upper part M21 of needle M2 is interference fitted in recess portion M12, so that needle M2 and valve rod M1 are integrally transported up and down It is dynamic.The low portion M22 of needle M2 and the valve opening (not shown) on valve seat cooperate to adjust the aperture of electric expansion valve.In addition, It is provided with sealing element M3 between the lower end and needle M2 of valve rod M1, to provide between needle component M and valve seat (not shown) Sealing.

However, in the operating process of electric expansion valve, it is understood that there may be due to the foozle of each part, rigging error with And it is influenced by external force or vibration and makes between each part of electric expansion valve that there are position deviations.Due to valve rod M1 and needle It is interference fitted between M2, needle component M can not provide axial elasticity appropriate or radial compliance, therefore rigidly connected valve Needle assemblies M can not be adjusted effectively in actual motion because part is processed or assembles bring position deviation, so that needle component M It is easy to contact firmly with other components (for example, valve seat) formation, is easy that part is made to be stuck in some position, and stuck phenomenon occur, Prevent electric expansion valve is from normally playing its function, and between components, generation rubs, and causes to wear, influences electronic expansion The performance and service life of valve.Manufacture in order to avoid the generation of above-mentioned phenomenon as far as possible, to each part of electric expansion valve Precision, motor performance etc. propose higher requirement, increase the manufacturing cost of electric expansion valve.

In the above context, the design of the needle component of flexible connection is proposed.The needle component of flexible connection is mainly adopted Make needle that can axially and radially adjust it with the radial clearance fit of the elastic parts such as spring and needle and valve rod Position, it is thus possible to adverse effect caused by being effectively reduced because of part processing or assembly bring position deviation.Needle component This flexible connection so that each components and needle formed it is soft contact, when there are above-mentioned position deviation, enable needle Relative to stem movement, above-mentioned stuck phenomenon is avoided the occurrence of, to completely eliminate or largely reduce above-mentioned inclined by position It is adversely affected caused by difference, therefore reduces the requirement to the accuracy of manufacture, the motor performance of each components of electric expansion valve etc..

With the gradually development and application such as electric bus, heat pump, need of the real system for the two-way function of electric expansion valve Ask increasingly strong, more stringent requirements are proposed to electric expansion valve, it is desirable that electric expansion valve can be accurate under 2-way state Ground adjusts flow, that is, it is desirable that electric expansion valve is used as bidirectional electronic expansion valve.In the valve with above-mentioned traditional flexible connection In the electric expansion valve of needle assemblies, although axial elasticity and radial compliance can be provided by using elastic parts such as springs to have Effect is reduced because adversely affecting caused by the position deviation that part is processed or assembly occurs, however simultaneously due to this electric expansion valve Its axial elasticity is not controlled so that this electric expansion valve under reverse state, it is especially biggish big in flow It is flexible and compressed due to the elastic parts such as spring itself under the reverse state of bore valve, cause needle electric expansion valve not Certain aperture is generated under valve opening state with respect to valve seat, thus the refrigeration effect in generating phenomena such as leakage, when reducing reversed Rate.Therefore, because the structure of needle component itself limits and cannot better meet property of the electric expansion valve under reverse state It can require.

Therefore, it is necessary to the performances under the reverse state to the electric expansion valve of flexible connection to improve, so that electronics is swollen Swollen valve can accurately adjust flow in forward condition and reverse state, work orderly.

Summary of the invention

It is an object of the invention to one or more of solve or improve problem above.

One aspect of the present invention is to provide a kind of needle component, which is used for electric expansion valve.The needle Component includes valve rod, needle, elastic element and stop configurations.Valve rod is suitable under the driving of the driving mechanism of electric expansion valve Axially movable.Needle and valve rod be connected into enable needle relative to valve rod axially movable.Elastic element is arranged in valve Between bar and needle, and elastic element is suitable for applying active force to needle.Stop configurations, stop configurations include being set to valve rod The first stop part and be set to the second stop part of needle, the first stop part and the second stop part be suitable for mutual abut and in electricity Limiting needle under the closed state of sub- expansion valve and moving into relative to valve rod along the first direction for opening electric expansion valve makes electricity Sub- expansion valve is opened.

In one embodiment, needle component is configured to: under the closed state of electric expansion valve, the first stop part with Second stop part separates predetermined axially spaced-apart, so that when active force of the fluid matasomatism on needle overcomes the active force of elastic element When, needle, which can be moved into relative to valve rod along first direction, abuts the first stop part mutually with the second stop part.With this side Formula can be conducive to the axial elasticity for making full use of electric expansion valve.Alternatively, needle component is configured to: in electronic expansion In the closing process of valve, valve rod, which is moved into relative to needle along the second direction opposite with first direction, makes the first stop part and the Two stop parts mutually abut, so that under the closed state of electric expansion valve, when active force of the fluid matasomatism on needle overcomes When the active force of elastic element, needle is prevented from moving relative to valve rod along first direction.In this way, it is possible to be conducive to sufficiently Ensure the reliable closing of electric expansion valve and prevents from being opened accidentally.

In one embodiment, the first stop part is the valve stem coupling member being fixed on valve rod, and the second stop part is peace Packing holder on needle, packing holder can be with needles integrally axially movable.Between packing holder and needle Compression is equipped with valve opening sealing element, under the closed state of electric expansion valve, the valve opening of valve opening sealing element sealed electronic expansion valve.

In one embodiment, needle component further includes adjusting gasket.Adjusting gasket is fixed on needle and in axis Upwards between the lower end and packing holder of valve rod.Needle component is configured to: when needle relative to valve rod along first direction When moving and abutting the first stop part mutually with the second stop part, adjusting gasket also mutually abutted with the lower end of valve rod to Additional stop configurations or adjusting gasket is constituted to keep being spaced apart with the lower end of valve rod.

In one embodiment, packing holder and needle clearance fit, and the lower axial end portion of adjusting gasket can Abut packing holder so that packing holder and needle integrally axially movable.

In one embodiment, the first stop part is the lower end of valve rod, and the second stop part is fixed on needle Adjusting gasket.

Needle component further includes valve stem coupling member and packing holder, and valve stem coupling member is fixed on valve rod, packing holder peace On needle and it is presented axially in the lower section of adjusting gasket and valve stem coupling member, packing holder can be with needle integrally Axially movable.Needle component is configured to: making the first stop part and second when needle is moved relative to valve rod along first direction When stop part mutually abuts, valve stem coupling member also mutually abuts with packing holder and constitutes additional stop configurations or valve rod is connect Part is spaced apart with packing holder holding.

Compression is equipped with valve opening sealing element, under the closed state of electric expansion valve, valve between packing holder and needle The valve opening of hole sealing element sealed electronic expansion valve.

In one embodiment, adjusting gasket is provided with the first anti-delinking part, and the lower end of valve stem coupling member is provided with Two anti-delinking parts.First anti-delinking part is suitable for cooperating with the second anti-delinking part to limit needle relative to valve rod edge and the first direction phase Anti- second direction movement.

In one embodiment, the first stop part is the lower end of valve rod, and the second stop part is fixed on needle Needle connector, needle connector are integrally formed with periphery wall portion and transverse wall portion, and transverse wall portion is by the inside of periphery wall portion It is divided into upper recess and lower concave part.Valve opening sealing element is installed in lower concave part, valve opening sealing element is compressed in transverse wall portion and valve Between needle, under the closed state of electric expansion valve, the valve opening of valve opening sealing element sealed electronic expansion valve.

The upper axial end portion of periphery wall portion is provided with the first anti-delinking part, and is provided with the second anti-delinking part on valve rod, First anti-delinking part is suitable for cooperating with the second anti-delinking part to limit needle relative to valve rod along the second direction opposite with first direction Movement.

In one embodiment, needle is at least partially disposed on the interior intracavitary of valve rod.

In one embodiment, needle is internally provided with needle access, and needle access passes through needle in the axial direction.Valve Bar is internally provided with valve stem passage, valve stem passage pass through in the axial direction valve rod and with needle passage.

In one embodiment, it is formed with annular groove on needle, chamber seal, chamber is provided in annular groove Room sealing element is compressed between needle and valve rod.

It is another aspect of the invention to provide a kind of electric expansion valves.The electric expansion valve includes valve seat, driving mechanism And needle component according to the present invention.Valve seat includes first port and second port, and one in first port and second port Person is used as fluid inlet, and the other of first port and second port are used as fluid outlet.Valve seat further include first chamber and Valve opening, first chamber and first port are in fluid communication, and selectively fluid connects via valve opening for first chamber and second port It is logical.Driving mechanism valve needle component moves back and forth so that needle and valve opening cooperate, to adjust the aperture of valve opening.

In one embodiment, driving mechanism includes motor.Motor includes rotor and stator, and rotor is fixedly connected intentionally Axis.One end of mandrel and needle component are operatively connected with the reciprocating motion of valve needle component.Motor and needle component it Between define second chamber, and mandrel access is formed in mandrel, mandrel access and the valve stem passage being formed in valve rod And the needle passage that is formed in needle and constitute balance channel, which is connected to second chamber and second Port.

The present invention can effectively limit opposite fortune of the needle relative to valve rod by the way that stop part is arranged on needle component It is dynamic, so that the axial elasticity to needle limits.By needle component according to the present invention and electric expansion valve, can prevent The valve opening of electric expansion valve is opened in advance under fluid force and interior leakage occurs, so that it is guaranteed that electric expansion valve is in fluid forward direction The aperture that valve opening can be accurately controlled under flow regime and reverse fluid flow state, plays the work of bidirectional electronic expansion valve With.In addition, needle component according to the present invention and electric expansion valve are by setting balance channel, effectively balanced valve needle assemblies exist Stress in motion process, driving force needed for can reduce valve needle component.

Detailed description of the invention

Hereinafter reference will be made to the drawings only describes embodiments of the present invention by way of example, in the accompanying drawings, identical feature or Component the same reference numerals are used to designate and the drawings are not necessarily drawn to scale, and in the accompanying drawings:

Fig. 1 is the schematic diagram of the needle component of the electric expansion valve of the prior art；

Fig. 2 is the sectional view of the needle component of the section line A-A interception in Fig. 1；

Fig. 3 is the sectional view of the electric expansion valve of the relevant technologies；

Fig. 4 is the sectional view of electric expansion valve according to the present invention；

Fig. 5 is the schematic diagram of needle component according to the first embodiment of the present invention；

Fig. 6 is the sectional view of the needle component of the taken through section line B-B in Fig. 5；

Fig. 7 is the enlarged drawing of part shown in circle I in Fig. 6；

Fig. 8 is the schematic diagram of needle component according to the second embodiment of the present invention；

Fig. 9 is the sectional view of the needle component of the taken through section line C-C in Fig. 8；And

Figure 10 is the enlarged drawing of part shown in circle II in Fig. 9.

Specific embodiment

Following description is substantially merely exemplary and is not intended to the limitation present invention, application and purposes.It should be appreciated that In all these attached drawings, similar appended drawing reference indicates identical or similar part and feature.Each attached drawing is only schematic Ground illustrates the design and principle of embodiments of the present invention, might not show the specific ruler of each embodiment of the present invention Very little and its ratio may illustrate each implementation of the present invention in the specific part in specific attached drawing or figure by the way of exaggeration The correlative detail or structure of mode.

In the description of embodiments of the present invention, it is used to "upper", the relevant directional terminology in "lower" be with attached drawing Shown in the upper and lower position of view describe, used " forward direction ", " reversed " limited according to the flow direction of fluid Fixed.In the practical application of electric expansion valve or needle component, "upper" used herein, "lower" positional relationship and The flow direction of " forward direction ", " reversed " can limit according to the actual situation, these relationships and direction can mutually overturn.

Fig. 3 shows a kind of sectional view of electric expansion valve 100 of the relevant technologies.Electric expansion valve 100 mainly includes driving Motivation structure 10, needle component 20, valve seat 30.Driving mechanism 10 includes stepper motor, and stepper motor includes stator 11 and rotor 12. Mandrel 13 is fixedly connected on rotor 12, mandrel 13 is integrally rotated with rotor 12.Needle component 20 includes valve rod 21, needle 22 And spring 23.The upper end 24 of spring 23 and needle 22 is accommodated in the inner cavity 211 of valve rod 21.The upper end of spring 23 is against valve The top of the inner cavity 211 of bar 21, against the upper end of needle 22, spring 23 exerts a force to needle 22 for the lower end of spring 23.Needle 22 Lower end from the lower end of valve rod 21 stretch out.The upper end of valve rod 21 is operatively connectable to the lower end of mandrel 13, so that The rotary motion of mandrel 13 is converted into the movement of needle component 20 (axial direction) along the vertical direction, so that the lower end of needle 22 and valve Valve opening 31 on seat 30 cooperates to adjust the flow of the fluid by electric expansion valve 100.

In needle component 20, spring 23 applies active force to needle 22, and needle 22 can be under the active force of spring 23 It is moved up and down in the inner cavity of valve rod 21 211 relative to valve rod 21, is flexible connection between needle 22 and valve rod 21.When electronics is swollen When there is position deviation caused by manufacture or build-up tolerance in swollen valve 100, needle 22 can overcome the elastic force of spring 23 and It is moved up in the inner cavity 211 of valve rod 21 relative to valve rod 21, to provide axial elasticity and radial compliance, avoids occurring stuck Phenomenon.Therefore, electric expansion valve 100 can be reduced to the accuracy of manufacture of each components and the requirement of assembly precision.

When electric expansion valve 100 is used as bidirectional electronic expansion valve, under fluid forward flow state, fluid is from pipeline 51 It flows into the first chamber C1 in the valve seat 30 of electric expansion valve 100, when needle component 20 opens the valve opening 31 on valve seat 30, Fluid flows out electric expansion valve 100 from pipeline 52.Under reverse fluid flow state, when needle component 20 is opened on valve seat 30 When valve opening 31, fluid is flowed out out of, first chamber C1 in the valve seat 30 that pipeline 52 flows into electric expansion valve 100, and from pipeline 51 Electric expansion valve.

Under reverse fluid flow state, especially in the case where large diameter valve, fluid applies the lower end of needle 22 Add upward active force, which may overcome the active force of spring 23 and needle 22 is moved up.In needle component In 20, the distance that needle 22 overcomes the active force of spring 23 to move up is limited by the rigidity of spring 23, in addition to this, to bullet Axial elasticity provided by spring 23 is not subject to other controls.However, the rigidity of spring 23 can not be arranged it is too much, it is no It will then lose and provide the meaning of axial elasticity and radial compliance by flexible connection.Therefore, it is not yet requiring to open on valve seat 30 Valve opening 31 when, needle 22 be possible to overcome under the active force of fluid the active force of spring 23 have moved up it is excessive away from From so that valve opening 31 is opened in advance, causing interior leakage, flow through electricity to can not accurately control under reverse fluid flow state The flow of the fluid of sub- expansion valve.

In view of problem above, present inventors have proposed present inventive concepts.The present invention is soft by the axial direction to electric expansion valve Property limits, and electric expansion valve is avoided to open the valve on valve seat in advance because of fluid force under reverse fluid flow state Hole and interior leakage phenomenon occurs so that electric expansion valve can be accurately controlled in forward condition and reverse state, to flow through electronics swollen The flow of the fluid of swollen valve.

Illustrate electric expansion valve 200 according to the first embodiment of the present invention below with reference to Fig. 4 to Fig. 7.Fig. 4 is shown The sectional view of electric expansion valve 200, wherein electric expansion valve 200 is in close state, Fig. 5 and Fig. 6 are shown in Fig. 4 The needle component 120 for the electric expansion valve 200 being in close state, Fig. 7 show the partial enlarged view of needle component 120.

Electric expansion valve 200 mainly includes driving mechanism 110, needle component 120, valve seat 130.Driving mechanism 110 is arranged Between upper cover 141 and supporting element 143, and it is arranged in shell 142.Driving mechanism 110 includes stepper motor, stepper motor Including stator 111 and rotor 112.Mandrel 113 is fixedly connected on rotor 112, mandrel 113 is integrally rotated with rotor 112.

First port 131 and second port 132 are provided on valve seat 130.First port 131 is connect with pipeline 151, and second Port 132 is connect with pipeline 152.One of first port 131 and second port 132 may be used as fluid inlet, another one It may be used as fluid outlet.First chamber C11 is formed in valve seat 130.Fluid flows into first chamber C11 through fluid inlet, And electric expansion valve is flowed out from fluid outlet.First chamber C11 and first port 131 are in fluid communication, and first chamber C11 with Second port 132 is via 134 selective fluid communication of valve opening.Valve opening 134 is formed on the transverse part of valve seat 130, and hereafter The needle that will be described cooperates to adjust the aperture of electric expansion valve 200.

Needle component 120 is arranged between supporting element 143 and valve seat 130.Between needle component 120 and supporting element 143 Anti-rotation part 144 is installed.Needle component 120 includes valve rod 121, needle 122, elastic element, stop configurations and sealing element. Elastic element is, for example, spring 123.Sealing element includes chamber seal S1 and valve opening sealing element S2.Stop configurations are for limiting valve Relative motion between needle and valve rod.Specifically, stop configurations include being set to the first stop part of valve rod 121 and being set to valve Second stop part of needle 122.It can have predetermined axially spaced-apart between first stop part and the second stop part, between the predetermined axial direction Being interposed between under the opening state of electric expansion valve 200 has maximum value.First stop part and the second stop part be suitable for mutually abutting and Needle 122 can be limited under the closed state of electric expansion valve 200 (beats electric expansion valve 200 upwards relative to valve rod 121 The direction opened) move into make electric expansion valve 200 open.First stop part and the second stop part are in valve rod 121 and needle 122 Relative movement in stop configurations the component mutually abutted first.Herein, it should be pointed out that herein, statement " limitation needle moved upwards into relative to valve rod open electric expansion valve " can cover " needle be prevented from relative to valve rod to Upper movement " and " allowing needle to move upwards preset distance relative to valve rod while keeping electric expansion valve to close ".Also, Herein, the closed state of electric expansion valve refers to the valve opening 134 that needle 122 is closed on valve seat, so that first chamber C11 It is not in fluid communication with second port 132.

The upper end of valve rod 121 is provided with threaded hole 1211, is threadedly engaged with the external screw thread of the lower end with mandrel 113. Alternatively, it is also possible to which external screw thread is arranged in the upper end of valve rod 121, and internal screw thread is set in the lower end of mandrel 113.Valve rod 121 middle section is provided with inner hole 1212, and the low portion of valve rod 121 is provided with inner hole 1213, and inner hole 1213 is light Hole.The diameter of inner hole 1212 is less than the diameter of inner hole 1213, so that the junction between inner hole 1212 and inner hole 1213 is formed Stage portion 1214.Spring 123 is compressed in inner hole 1213, one end of spring 123 against stage portion 1214, spring 123 it is another End is resisted against on the upper end 1221 of needle 122, applies active force to needle 122.

Needle 122 includes upper end 1221, middle section 1222 and lower end 1223.The upper end 1221 of needle 122 It can have the diameter being substantially the same with middle section 1222.Annular is formed between upper end 1221 and middle section 1222 Groove 1224.Needle 122 is at least partially received in inner hole 1213, and can be moved up and down in inner hole 1213.Specifically Ground, at least part and upper part 1221 of the middle section 1222 of needle 122 are accommodated in inner hole 1213, and can be It moves up and down in inner hole 1213.Chamber seal S1 is accommodated in the annular groove 1224, and is press-fitted in annular groove Between 1224 and the inner wall of inner hole 1213, to provide two way seal.The lower end 1223 of needle 122 is in and the valve on valve seat 130 The truncated cone shape that hole 134 cooperates, taper can be set according to the discharge characteristic of electric expansion valve.The lower end of needle 122 1223 diameter is gradually reduced from top to bottom, and the maximum gauge of lower end 1223 is greater than the diameter of middle section 1222, thus The junction of middle section 1222 and lower end 1223 forms stage portion 1225.

Valve stem coupling member 124 is fixedly mounted on (such as passing through interference fit) to the lower end of valve rod 121, so that valve rod 121 lower end is in valve stem coupling member 124, and the lower end 1223 of needle 122 is stretched from the lower section of valve stem coupling member 124 Out.Hole 1241 and hole 1242 are formed in valve stem coupling member 124, the diameter in hole 1241 is greater than the diameter in hole 1242, thus in hole Junction between 1241 and hole 1242 is formed with flange 1243.

Packing holder 125 is mounted on the middle section 1222 of needle 122, close to lower end 1223.The valve opening of elasticity is close Sealing S2 compression is mounted between packing holder 125 and stage portion 1225, such as may be at overcompression state.In needle 122 When closing the valve opening 134 on valve seat 130, valve opening sealing element S2 is contacted with the surface 133 of valve seat 130.As shown in figure 4, in valve seat The protrusion 135 around valve opening 134 is formed on 130 surface 133.The outer diameter of protrusion 135 is less than under packing holder 125 The internal diameter of end, so that protrusion 135 is pressed against valve opening sealing element S2 under the closed state of electric expansion valve 200.

Adjusting gasket 126 is interference fitted on the middle section 1222 of needle 122.Adjusting gasket 126, which has, to be relatively large in diameter Upper axial end portion 1261 and the lesser lower axial end portion 1262 of diameter.The upper axial end portion 1261 of adjusting gasket 126 is shelved on On flange 1243, allows to limit needle 122 and move downward excessive displacement relative to valve rod and deviate from from inner hole 1213. The upper axial end portion 1261 of adjusting gasket 126 constitutes the first anti-delinking part, and flange 1243 constitutes the second anti-delinking part.Adjusting gasket 126 Lower axial end portion 1262 be located between the inner peripheral of flange 1243 and the peripheral surface of the middle section 1222 of needle 122.In Under the closed state of electric expansion valve 200 shown in Fig. 4, the lower axial end portion 1262 of adjusting gasket 126 is connected to packing holder On 125 upper surface, so that packing holder 125 can also be with adjusting even if packing holder 125 and needle 122 are clearance fit Gasket 126 and needle 122 integrally move.

Fig. 7 shows the enlarged drawing of part shown in the circle I in Fig. 6.As shown in fig. 7, in the closing of electric expansion valve 200 Under state, first axis interval d1 is formed between the top surface of packing holder 125 and the bottom surface of valve stem coupling member 124, The second axially spaced-apart d2 is formed between the lower end of valve rod 121 and the top surface of adjusting gasket 126.First axis interval d1 There is maximum value under the opening state of electric expansion valve 200 with the second axially spaced-apart d2.In this illustrative embodiments, In First axis interval d1 and the second axially spaced-apart d2 under the closed state of electric expansion valve 200 are respectively equal in electric expansion valve First axis interval and the second axially spaced-apart under 200 opening state.

When fluid forward flow, fluid is out of, pipeline 151 flows into electric expansion valve 200 first chamber C11.Work as electronics When there is position deviation caused by manufacture or build-up tolerance in expansion valve 200, needle 122 can overcome the elastic force of spring 123 And moved up in the inner hole of valve rod 121 1213 relative to valve rod 121, to provide axial elasticity and radial compliance, avoid Stuck phenomenon occurs, electric expansion valve 200 is worked normally.Therefore, electric expansion valve 100 can be reduced to each zero The accuracy of manufacture of part and the requirement of assembly precision.

When reverse fluid flow, when needle 122 opens valve opening 134, fluid flows into electric expansion valve from pipeline 152 In 200 first chamber C11, and electric expansion valve 200 is flowed out from pipeline 151.Fluid in pipeline 152 applies needle 122 Upward active force.Under the closed state of electric expansion valve 200, when the active force that fluid is applied to needle 122 overcomes spring 123 elastic force and make needle 122 relative to valve rod 121 upwards (make valve opening 134 open direction) movement when, packing holder 125, Adjusting gasket 126 is integrally moved upwards with needle 122.

In the electric expansion valve 200 of present embodiment, when needle 122 moves upwards first axis relative to valve rod 121 Distance after, at least one of first axis interval d1 and the second axially spaced-apart d2 eliminate, needle 122 relative to valve rod 121 to On movement be blocked, needle 122 can not continue to move upwards relative to valve rod 121, at this point, valve rod 121 and needle 122 it Between connection become to be rigidly connected.

Specifically, in the case where first axis interval d1 is less than or equal to the second axially spaced-apart d2, when needle 122 is opposite After valve rod 121 moves upwards first axis distance, first axis interval d1 is eliminated first, so that the top of packing holder 125 The bottom surface of surface abutting valve stem coupling member 124.Since valve stem coupling member 124 is fixedly attached to valve rod 121, needle 122 It can not continue to move upwards relative to valve rod 121, at this point, the connection between valve rod 121 and needle 122 becomes to be rigidly connected, Valve stem coupling member 124 and packing holder 125 constitute the stop configurations for limiting axial elasticity.At this point, 124 structure of valve stem coupling member At the first stop part of stop configurations, packing holder 125 constitutes the second stop part of stop configurations.D1 etc. at first axis interval In the case where the second axially spaced-apart d2, when the bottom surface of valve stem coupling member 124 is mutually abutted with the top surface of packing holder 125 When, adjusting gasket 126 can mutually be abutted with the lower end of valve rod 121, to form additional stop configurations.Alternatively, In In the case that first axis interval d1 is less than the second axially spaced-apart d2, when the bottom surface and packing holder 125 of valve stem coupling member 124 Top surface when mutually abutting, adjusting gasket 126 can keep being spaced apart with the lower end of valve rod 121.

Alternatively, in the case where first axis interval d1 is greater than or equal to the second axially spaced-apart d2, when 122 phase of needle After moving upwards first axis distance for valve rod 121, the second axially spaced-apart d2 is eliminated first, so that adjusting gasket 126 Top surface is abutted with the lower end of valve rod 121, so that needle 122 can not continue to move upwards relative to valve rod 121, at this point, Connection between valve rod 121 and needle 122 becomes to be rigidly connected.At this point, the lower end of valve rod 121 constitutes the first of stop configurations Stop part, adjusting gasket 126 constitute the second stop part of stop configurations.It is equal to the second axially spaced-apart d2 in first axis interval d1 In the case where, when the lower end of valve rod 121 is mutually abutted with the top surface of adjusting gasket 126, the bottom table of valve stem coupling member 124 Face can mutually be abutted with the top surface of packing holder 125, to form additional stop configurations.Alternatively, in first axis In the case that interval d1 is greater than the second axially spaced-apart d2, when the lower end of valve rod 121 and the top surface of adjusting gasket 126 are mutually supported When connecing, the bottom surface of valve stem coupling member 124 can keep being spaced apart with the top surface of packing holder 125.

In addition, integrally moved upwards relative to valve rod 121 in needle 122, packing holder 126 and adjusting gasket 126 In the process, elastic valve opening sealing element S2 can stretch upwards with packing holder 126, but still be compressed in packing holder 125 and valve Between protrusion 135 on the upper surface 133 of the transverse part of seat 130, and valve opening 134 is surrounded, still is able to provide needle component 120 With the sealing between valve opening 134.Therefore, pass through the above-mentioned setting of needle component 120, under reverse fluid flow state, needle Needle 122 in component 120 can move upwards under fluid force relative to valve rod 121, but be not unlimitedly to Upper movement.After needle 122 moves upwards first axis distance relative to valve rod 121, in driving mechanism 110 to needle component Before 120 are driven to open valve opening 134, needle 122 will not continue to move upwards relative to valve rod 121 and in advance by valve Hole 134 is opened, so that valve opening 134 still keeps being closed, so that above-mentioned interior leakage phenomenon is avoided the occurrence of, so that electric expansion valve 200 It can also be worked normally under reverse fluid flow state.

Under the closed state of electric expansion valve 200 shown in Fig. 4, exist between the first stop part and the second stop part There is predetermined axially spaced-apart (the first axis interval between the top surface of packing holder 125 and the bottom surface of valve stem coupling member 124 Lesser one in d1 and the second axially spaced-apart d2 between the lower end of valve rod 121 and the top surface of adjusting gasket 126 Person), and the predetermined axially spaced-apart is equal to the first stop part and the second stop part under the opening state of electric expansion valve 200 Between axially spaced-apart.However, herein it is noted that electric expansion valve according to the present invention 200 may also be so constructed that The predetermined axially spaced-apart of first stop part and the second stop part under the closed state of electric expansion valve 200 is less than in electronic expansion Axially spaced-apart under the opening state of valve 200.

Specifically, it moves downward under driving of the needle component 120 in driving device 110 with the process of close valve orifice 134 In, when the lower end of needle 122 1223 is cooperated in valve opening 134 when close valve orifice 134, can according to need makes valve rod 121 It is moved downward relative to needle 122 to reduce first axis interval d1 and the second axially spaced-apart d2 or eliminate first axis interval At least one of d1 and the second axially spaced-apart d2.Valve rod 121 can be moved downward relative to needle 122, so that first axis D1 and the second axially spaced-apart d2 is spaced to reduce, so that under the closed state of electric expansion valve 200, the first stop part and the Axially spaced-apart between two stop parts reduces.As a result, under the closed state of electric expansion valve 200, when fluid matasomatism is in needle When active force on 122 overcomes the active force of spring 123, needle 122 subtracts relative to the axial distance that valve rod 121 moves upwards It is small.

Valve rod 121 can continue to be moved down into so that between first axis interval d1 and the second axial direction relative to needle 122 It is eliminated every at least one of d2, so that under the closed state of electric expansion valve 200, the first stop part and the second backstop Part mutually abuts, so that the first stop part is prevented from moving upwards relative to the second stop part.It is similar with above scheme, work as valve rod 121 are moved down into when being eliminated first axis interval d1 first relative to needle 122, and the top surface of packing holder 125 supports Connect the bottom surface of valve stem coupling member 124.Valve stem coupling member 124 constitutes the first stop part of stop configurations, and packing holder 125 is constituted Second stop part of stop configurations.When the bottom surface of valve stem coupling member 124 is mutually abutted with the top surface of packing holder 125, Adjusting gasket 126 can mutually be abutted with the lower end of valve rod 121, to form additional stop configurations.Alternatively, work as valve rod When the bottom surface of connector 124 is mutually abutted with the top surface of packing holder 125, adjusting gasket 126 can under valve rod 121 End keeps being spaced apart.At this point, valve rod 121 can be moved downward further relative to needle 122, so that valve stem coupling member 124 Packing holder 125 is compressed so that valve opening sealing element S2 is further compressed, so that packing holder 125 is downward relative to needle downwards Movement, so that the second axially spaced-apart d2 is further decreased and even is eliminated.

When valve rod 121 is moved down into relative to needle 122 is eliminated the second axially spaced-apart d2 first, adjusting gasket 126 top surface is abutted with the lower end of valve rod 121.The lower end of valve rod 121 constitutes the first stop part of stop configurations, adjusts Second stop part of the composition stop configurations of gasket 126.When the lower end of valve rod 121 and the top surface of adjusting gasket 126 are mutually supported When connecing, the bottom surface of valve stem coupling member 124 can mutually be abutted with the top surface of packing holder 125, to form additional backstop Structure.Alternatively, when the lower end of valve rod 121 is mutually abutted with the top surface of adjusting gasket 126, valve stem coupling member 124 Bottom surface can with the top surface of packing holder 125 keep be spaced apart.

Test data shows the maximum operating pressure differential that electric expansion valve can be improved by above-mentioned setting, this is for reversed The operting differential pressure effect of flow regime is especially apparent, and the operting differential pressure under reverse flow can be improved 1.5 times to 5 times.

In addition, compared with the electric expansion valve 100 of the relevant technologies shown in Fig. 3, electric expansion valve 200 according to the present invention Additionally provide other advantage.Since in the operating process of electric expansion valve, driving mechanism transports needle component up and down reciprocatingly It is dynamic, therefore, as shown in figure 3, there are second chamber C2 between driving mechanism and needle component.Flow into the stream in first chamber C1 Know from experience and second chamber C2 is entered by the fit clearance between the related components in electric expansion valve 100.When needle component 20 under the driving of driving mechanism 10 when being moved upwardly or downwardly, and the volume of second chamber C2 will change, to be formed Influence the back pressure cavity that needle component 20 moves.It moves upwards when under driving of the needle component 20 in driving mechanism 10 to open valve opening When 31, the volume of second chamber C2 becomes smaller.This meeting so that the fluid in second chamber C2 apply on needle component 20 it is biggish Downward active force, to need biggish driving force move upwards needle component 20 to open valve opening 31.When needle group When part 20 moves downward under the driving of driving mechanism 10 with close valve orifice 31, the volume of second chamber C2 becomes larger, second chamber Downward active force of the fluid matasomatism on needle component 20 in C2 reduces, this makes that biggish driving force is needed to make needle Component 20 is moved downward with close valve orifice 31.This usually makes driving mechanism excessive, and cost is excessively high.

Electric expansion valve 200 according to the present invention further solves the above problem, can effectively reduce required driving Power reduces cost so as to reduce the power requirement to driving mechanism.

In electric expansion valve 200, as shown in figure 4, there are the second chambers between driving mechanism 110 and needle component 120 Room C12.When being moved upwardly or downwardly under driving of the needle component 120 in driving mechanism 110, the volume of second chamber C12 will It can change.Second chamber C12, which is formed, influences the back pressure cavity that needle component 120 moves.Second chamber C12 and first chamber It is sealed between C11 by chamber seal S1.

In order to which active balance second chamber C12 is to the active force of needle component 120, electric expansion valve 200 is provided with balance Channel, the balance channel are connected to second chamber C12 and second port 132.

As it was noted above, being formed with the threaded hole 1211, inner hole 1212, inner hole 1213 to communicate with each other in valve rod 121.Screw thread Hole 1211, inner hole 1212, inner hole 1213 form the valve stem passage 1215 for passing axially through valve rod 121.As shown in figure 4, mandrel 113 It is inside formed with mandrel access 1131, mandrel access 1131 includes axial continuation and radially extending portion (not shown), mandrel Access 1131 is connected to the second chamber C12 in electric expansion valve 200.In addition, as shown in Figure 4 and Figure 6, being formed in needle 122 There is needle access 1226.Needle access 1226 passes axially through needle 122, one end of needle access 1226 and second port 132 It is connected to pipeline 152, the other end of needle access 1226 is connected to the inner hole 1213 of valve rod 121.Mandrel access 1131, valve rod are logical Road 1215, needle access 1226 communicate with each other, and constitute above-mentioned balance channel.

When moving upwards under driving of the needle component 120 in driving mechanism 110 to open valve opening 134, with the second chamber The reduction of the volume of room C12, the fluid in second chamber C12 flow to pipeline 152 by above-mentioned balance channel, effectively reduce Fluid in two cavity Cs 12 transports needle component 120 upwards so as to reduce the downward active force of needle component 120 Dynamic driving force.When moving downward under driving of the needle component 120 in driving mechanism 110 with close valve orifice 134, pipeline 152 A part of interior fluid is flowed into second chamber C12 by above-mentioned balance channel, so that the fluid matasomatism in second chamber C12 Downward active force on needle component 120 increases, so as to reduce the driving force for moving downward needle component 120. Therefore, by the setting of above-mentioned balance channel, can effectively balanced valve needle assemblies 120 actual loading, reduce valve needle Driving force needed for component 120 reduces cost so as to reduce the power of driving mechanism.

Here, it should be noted that, in present embodiment, showing can be by between first axis interval d1 and the second axial direction The relative motion between needle and valve rod is limited every the elimination of one or both of d2.It is examined from the angle convenient for measurement control Consider, the relative motion between needle and valve rod only can be limited by the elimination of first axis interval d1.

In the present embodiment, adjusting gasket 126 is shown.But the adjusting gasket 126 it is not necessary to.According to this In the other embodiments of inventive concept, adjusting gasket 126 can also be saved, and is arranged on valve rod 121 and needle 122 respectively Corresponding anti-delinking part makes chamber seal and needle to prevent needle 122 from moving downward excessive distance relative to valve rod 121 It falls off out of valve rod 121, also can be realized above-mentioned similar technical effect.It, can be in the case where being not provided with adjusting gasket 126 Packing holder is arranged to be interference fitted with needle, integrally to move with needle.

Illustrate needle component 220 according to the second embodiment of the present invention below in conjunction with Fig. 8-Figure 10.In addition to needle Other than component 220, the other structures and the basic phase of structure of electric expansion valve 200 of the electric expansion valve including needle component 220 It is same or similar, it is not repeated to describe herein.Hereafter mainly needle component 220 will be described.

It is similar with needle component 120, needle component 220 include valve rod 221, needle 222, elastic element, sealing element and Stop configurations.Elastic element is, for example, spring 223.Sealing element includes chamber seal S21 and valve opening sealing element S22.Backstop knot Structure is used to limit the relative motion between needle and valve rod.Specifically, stop configurations include being set to the first backstop of valve rod 221 Part and the second stop part for being set to needle 222.It can have predetermined axially spaced-apart between first stop part and the second stop part, Predetermined axial be spaced under the opening state of electric expansion valve 200 has maximum value.First stop part and the second stop part are suitable In mutual abut, needle 222 can be limited under the closed state of electric expansion valve (keeps electronics swollen upwards relative to valve rod 221 The direction that swollen valve is opened) it moves into and opens electric expansion valve.

The upper end of valve rod 221 is provided with threaded hole 2211, is threadedly engaged with the external screw thread of the lower end with mandrel.It is intermediate Part is provided with inner hole 2212, and low portion is provided with inner hole 2213.Inner hole 2213 is unthreaded hole.The diameter of inner hole 2212 is small In the diameter of inner hole 2213, so that the junction between inner hole 2212 and inner hole 2213 forms stage portion 2214.Spring 223 holds It sets in inner hole 2213, against stage portion 2214, the other end of spring 223 is resisted against the upper end of needle 222 for one end of spring 223 In portion 2221, active force is applied to needle 222.

Needle 222 includes upper end 2221, middle section 2222 and lower end 2223.The upper end 2221 of needle 222 It can have identical diameter with middle section 2222.Annular groove is formed between upper end 2221 and middle section 2222 2224.Needle 222 is at least partially received in inner hole 2213, and can be moved up and down in inner hole 2213.Specifically, valve At least part and upper part 2221 of the middle section 2222 of needle 222 are accommodated in inner hole 2213, and can be in inner hole It moves up and down in 2213.Chamber seal S21 is accommodated in the annular groove 2224, and be press-fitted in annular groove 2224 with Between the inner wall of inner hole 2213, to provide two way seal.The lower end 2223 of needle 222 is in section with the valve opening cooperation on valve seat Taper, taper can be set according to the discharge characteristic of electric expansion valve.The diameter of the lower end 2223 of needle 222 on to Under be gradually reduced, the maximum gauge of lower end 2223 is greater than the diameter of middle section 2222, thus in middle section 2222 under The junction of end 2223 forms stage portion 2225.

Needle component 220 has needle connector 224.As shown in Figure 9, the section of needle connector 224 is in substantially H Shape.Needle connector 224 is integrally formed with axial periphery wall portion 2241 and transverse wall portion 2242, and in transverse wall portion Through-hole 2243 is formed on 2242.Needle connector 224 is interference fitted by the middle section 2222 of through-hole 2243 and needle 222 And be fixed on needle 222, so that needle connector 224 is integrally moved with needle 222.Transverse wall portion 2242 is by periphery wall portion 2241 inside is divided into upper recess and lower concave part, and valve opening sealing element S22 is mounted in the lower concave part, is compressed in needle connector Between 224 and the lower end 2223 of needle 222, for example, may be at overcompression state.The valve on valve seat is closed in needle 222 Kong Shi, valve opening sealing element S22 are contacted with the top surface of the transverse part of valve seat, the protrusion pressure on the top surface of the transverse part of valve seat By valve opening sealing element S2, to seal valve opening.In addition, having the first anti-delinking part in the upper end of needle connector 224, and in valve rod The second anti-delinking part is provided in 221 peripheral surface, the first anti-delinking part is suitable for cooperating with the second anti-delinking part to prevent 222 phase of needle Moving downward excessive distance for valve rod 221 deviates from chamber seal S21 and needle 222 from valve rod 221.First is anti- De- portion is, for example, the barb 2243 in the inner circumferential for the upper end for being formed in needle connector 224, and the second anti-delinking part is, for example, shape At hook portion 2216 in the peripheral surface of valve rod 221, being matched with the barb 2243.Pass through barb 2243 and valve rod The cooperation of above-mentioned hook portion 2216 in 221 peripheral surface can move axially downward to avoid needle 222 relative to valve rod 221 It moves excessive distance and deviates from chamber seal S21 and needle 222 from the inner hole 2213 of valve rod 221.

Figure 10 shows the enlarged drawing of part shown in the circle II in Fig. 9.As shown in Figure 10, in needle component 220, In There are third axially spaced-apart d3 between the top surface of the transverse wall portion 2242 of needle connector 224 and the lower end of valve rod 221.The Three axially spaced-apart d3 have maximum value under the opening state of electric expansion valve.In the present embodiment, the lower end of valve rod 221 Constitute the first stop part of stop configurations, needle connector 224 (more specifically, transverse wall portion 2242 of needle connector 224) Constitute the second stop part of stop configurations.

Needle component 220 can be configured under the closed state of electric expansion valve, the transverse wall portion of needle connector 224 Third axially spaced-apart d3 between 2242 top surface and the lower end of valve rod 221 is maximum value, that is, in the pass of electric expansion valve Third axially spaced-apart d3 under closed state is equal with the third axially spaced-apart under the opening state of electric expansion valve.Alternatively Ground, similar with needle component 120, needle component 220 also can be configured to fill in needle component 220 in the driving of electric expansion valve During moving downward under the driving set with close valve orifice, when the lower end of needle 222 2223 is cooperated in valve opening and close When valve opening, make valve rod 221 relative to moving downward relative to needle 222 to reduce or eliminate third axially spaced-apart d3, thus So that being less than the under the opening state of electric expansion valve in the third axially spaced-apart d3 under the closed state of electric expansion valve Three axially spaced-aparts.When valve rod 221 is relative to moving downward relative to needle 222 and eliminating third axially spaced-apart d3, needle connects The top surface of the transverse wall portion 2242 of fitting 224 is mutually abutted with the lower end of valve rod 221, so that needle 222 is prevented from relatively It is moved upwards in valve rod 221.

Similar with electric expansion valve 200, under fluid forward flow state, fluid flows into packet from the first port on valve seat In the electric expansion valve of component containing needle 220, and electric expansion valve is flowed out from second port.It is made when existing in the electric expansion valve Make or build-up tolerance caused by position deviation when, needle 222 can overcome the elastic force of spring 223 and in the inner hole of valve rod 221 It is moved up in 2213 relative to valve rod 221, to provide axial elasticity and radial compliance, avoids that stuck phenomenon occurs, so that The electric expansion valve can work normally.Therefore, electric expansion valve can be reduced to the accuracy of manufacture and assembly of each components The requirement of precision.

Similarly, under reverse fluid flow state, when needle 222 opens valve opening, second port of the fluid from valve seat It flows into the electric expansion valve comprising needle component 220.It is configured under the closed state of electric expansion valve in needle component 220 There is third axially spaced-apart d3 between the top surface of the transverse wall portion 2242 of needle connector 224 and the lower end of valve rod 221 In the case where, it is moved upwards when needle 222 overcomes the active force of spring 223 under the active force of fluid relative to valve rod 221 When, the needle connector 224 being interference fitted on needle 222 is integrally moved upwards with needle 222.When needle 222 is transported upwards After dynamic second axial distance, third axially spaced-apart d3 is eliminated, and the top surface of the transverse wall portion 2242 of needle connector 224 is against valve The lower end of bar 221, needle 222 can not continue to move upwards relative to valve rod 221, at this point, valve rod 221 and needle 222 it Between connection become to be rigidly connected.Second axial distance can be with first axis apart from same or different.In needle 222 and valve During needle connector 224 is integrally moved upwards relative to valve rod 221, elastic valve opening sealing element S22 can be with needle Connector 224 stretches upwards, but still protrusion on the transverse part of valve seat and be compressed in needle connector 224 and valve seat Between the protrusion of transverse part, and valve opening is surrounded, still is able to provide the sealing between needle component 220 and valve opening.In needle group Part 220 is configured to the top surface and valve rod of the transverse wall portion 2242 of the needle connector 224 under the closed state of electric expansion valve In the case that 221 lower end mutually abuts, as long as the driving mechanism of electric expansion valve does not drive needle component 220 at upward Movement is to open valve opening, even if needle 222 can not in the case where the active force of fluid is greater than the active force of spring 223 It is moved upwards relative to valve rod 221.

By the above-mentioned setting of needle component 220, under reverse fluid flow state, needle 222 is prevented from relative to valve Bar 221 moves upwards, or can move upwards under fluid force relative to valve rod 221, but be not unlimitedly to Upper movement.When third axially spaced-apart d3 is eliminated, before driving mechanism drives to open valve opening needle component 220, Needle 222 will not continue to move upwards relative to valve rod and in advance open valve opening, so that valve opening still keeps being closed, thus Above-mentioned interior leakage phenomenon is avoided the occurrence of, so that electric expansion valve can also work normally under reverse fluid flow state.

In addition, it is similar with needle component 120, in needle component 220, needle access 2226, valve are formed in needle 222 Needle access 2226 passes axially through needle 222, and is in fluid communication with the second port on valve seat.The threaded hole of valve rod 221 2211, inner hole 2212 and inner hole 2213 form the valve stem passage 2215 for passing axially through valve rod 221.Needle access 2226 and valve rod Access 2215 and the mandrel access being formed in mandrel collectively form balance channel, realize in electric expansion valve and are located at driving The fluid communication between the second port in second chamber and valve seat between mechanism and needle component, so as to effective Horizon The actual loading of weighing apparatus needle component 220, driving force needed for reducing valve needle component 220.

Therefore, it can be realized and needle group according to first embodiment according to the needle component 220 of second embodiment The similar technical effect of part 120.

In addition, the needle connector 224 in the needle component 220 of second embodiment both may be used compared with needle component 120 For use as stop part, it is also used as the mounting portion of anti-delinking part and valve opening sealing element, therefore, no setting is required for needle component 220 Adjusting gasket 126 and packing holder, therefore more compact structure.

Herein it should be noted that, although in this second embodiment, needle connector 224 is shown as section in substantially H-shaped, With the periphery wall portion 2241 and transverse wall portion 2242 being integrally formed, in entire periphery wall portion 2241, periphery wall portion 2241 Outer diameter be consistent so that the peripheral surface of periphery wall portion 2241 is generally flushed along axial direction, and transverse wall portion 2242 are essentially perpendicular to periphery wall portion 2241 and have the thickness being substantially the same, so that transverse wall portion 2242 is generally It is flat.However, the present invention is not limited thereto.It, can also be in periphery wall portion 2241 in other possible embodiments of the invention And/or stage portion is formed in transverse wall portion 2242.For example, the outer diameter of each section in the axial direction of periphery wall portion 2241 can be made Difference, to form stage portion.For example, can make transverse wall portion 2242 that radially there is different thickness, to be formed Stage portion.Alternatively, it is also possible to which it is not vertical with periphery wall portion 2241 to be inclined to transverse wall portion 2242.These modified examples It can be realized above-mentioned similar technical effect.

In addition, needle is at least partially disposed on the inside of valve rod in valve rod in embodiment illustrated above Inside is relative to stem movement.However, the present invention is not limited thereto.The end setting that design of the invention also can be applied to valve rod exists The inside of needle and make needle along design of the peripheral surface of valve rod relative to the needle component of stem movement.In addition, with On in the embodiment that shows, describe needle component and be provided with chamber seal and valve opening sealing element.It will be appreciated, however, that It can be omitted chamber seal (especially in the case where omitting balance channel).On the other hand, it also can be omitted valve opening sealing Part uses other suitable alternative sealing structures.For example, supporting the first stop part mutually with the second stop part using In the case where the valve closing mode connect, it is convenient to omit valve opening sealing element.In another example even making the first stop part and second in use It, can also be for example by making needle lower end and valve seat valve opening in the case that stop part separates the valve closing mode of predetermined axially spaced-apart Even if with F-SP and/or there is certain flexibility still to be able to make electric expansion valve to realize that needle moves up certain distance It remains turned-off.

Here, exemplary embodiments of the present invention have already been described in detail, it should be understood that, the present invention not office The specific embodiment for being limited to above-detailed and showing.Without departing from the spirit and scope of the present invention, ability The technical staff in domain can carry out various modifications and variant to the present invention.All these modifications and variant both fall within model of the invention In enclosing.Moreover, all components described herein can be replaced by component equivalent in other technologies.

Claims

1. a kind of needle component (120,220), the needle component (120,220) is used for electric expansion valve (200), the needle Component (120,220) includes:

Valve rod (121,221), the valve rod (121,221) is suitable for the driving mechanism (110) in the electric expansion valve (200) Under driving axially movable；

Needle (122,222), the needle (122,222) and the valve rod (121,221) are connected into so that the needle (122, It 222) can be relative to the valve rod (121,221) axially movable；

Elastic element (123,223), the elastic element (123,223) are arranged in the valve rod (121,221) and the needle Between (122,222) and the elastic element (123,223) is suitable for applying active force to the needle (122,222)；And

Stop configurations, the stop configurations include being set to the first stop part of the valve rod and being set to the second of the needle Stop part, first stop part is with second stop part suitable for mutually abutting and in the pass of the electric expansion valve (200) The needle (122,222) is limited under closed state beats the electric expansion valve (200) relative to the valve rod (121,221) edge The first direction opened, which moves into, opens the electric expansion valve (200).

2. needle component (120) according to claim 1, wherein first stop part is to be fixed on the valve rod (121) valve stem coupling member (124) on, second stop part are mounted in the packing holder on the needle (122) (125), the packing holder (125) can be with the needle (122) integrally axially movable.

3. needle component (120) according to claim 2, wherein the needle component (120) further includes adjusting gasket (126), the adjusting gasket (126) is fixed on the needle (122) and is presented axially under the valve rod (121) Between end and the packing holder (125), the needle component (120) is configured to: when the needle (122) is relative to described It is described when valve rod (121) moves along the first direction and abuts first stop part mutually with second stop part Adjusting gasket (126) also mutually abuts to constitute additional stop configurations or the tune with the lower end of the valve rod (121) Section gasket (126) keeps being spaced apart with the lower end of the valve rod (121).

4. needle component (120) according to claim 1, wherein first stop part is under the valve rod (121) End, second stop part are the adjusting gaskets (126) being fixed on the needle (122).

5. needle component (120) according to claim 4, wherein the needle component (120) further includes valve stem coupling member (124) it is fixed on the valve rod (121) with packing holder (125), the valve stem coupling member (124), the packing holder (125) it is mounted on the needle (122) and is presented axially in the adjusting gasket (126) and the valve stem coupling member (124) lower section, the packing holder (125) can be with the needles (122) integrally axially movable, the needle component (120) it is configured to: when the needle (122) is moved relative to the valve rod (121) along the first direction and making described first When stop part is mutually abutted with second stop part, the valve stem coupling member (124) and the packing holder (125) are also mutual It abuts and constitutes additional stop configurations or the valve stem coupling member (125) and keep being spaced apart with the packing holder (125).

6. needle component (220) according to claim 1, wherein first stop part is under the valve rod (221) End, second stop part are the needle connector (224) being fixed on the needle (222), the needle connector (224) periphery wall portion (2241) and transverse wall portion (2242) are integrally formed with, the transverse wall portion (2242) is by the periphery The inside of wall portion (2241) is divided into upper recess and lower concave part.

7. needle component (220) according to claim 6, wherein in the upper axial end portion of the periphery wall portion (2241) It is provided with the first anti-delinking part, and is provided with the second anti-delinking part on the valve rod (221), first anti-delinking part is suitable for and institute The cooperation of the second anti-delinking part is stated to limit the needle (222) relative to the valve rod (221) along opposite to the first direction Second direction movement.

8. needle component (220) according to claim 6, wherein be equipped with valve opening sealing element in the lower concave part (S22), the valve opening sealing element (S22) is compressed between the transverse wall portion (2242) and the needle (222), described Under the closed state of electric expansion valve (200), the valve opening sealing element (S22) seals the valve opening of the electric expansion valve (200) (134)。

9. the needle component (120) according to any one of claim 2,3,5, wherein in the packing holder (125) Compression is equipped with valve opening sealing element (S2) between the needle (122), the closed state in the electric expansion valve (200) Under, the valve opening sealing element (S2) seals the valve opening (134) of the electric expansion valve (200).

10. needle component (120) according to claim 3 or 5, wherein the packing holder (125) and the needle (122) clearance fit, and the lower axial end portion (1262) of the adjusting gasket (126) can abut the packing holder (125) so that the packing holder (125) and the needle (122) integrally axially movable.

11. needle component (220) according to claim 3 or 5, wherein it is anti-that the adjusting gasket (126) is provided with first De- portion, the lower end of the valve stem coupling member (124) are provided with the second anti-delinking part, and first anti-delinking part be suitable for it is described The cooperation of second anti-delinking part is to limit the needle (222) relative to the valve rod (221) along opposite to the first direction the The movement of two directions.

12. according to claim 1 to needle component (120,220) described in any one of 8, wherein the needle (122, 222) it is at least partially disposed on the interior intracavitary of the valve rod (121,221).

13. according to claim 1 to needle component (120,220) described in any one of 8, wherein the needle (122, 222) be internally provided with needle access (1226,2226), the needle access (1226,2226) pass through the valve in the axial direction Needle (122,222), and the valve rod (121,221) is internally provided with valve stem passage (1215,2215), the valve stem passage (1215,2215) pass through the valve rod (121,221) in the axial direction and are in fluid communication with the needle access (1226,2226).

14. according to claim 1 to needle component (120,220) described in any one of 8, wherein the needle (122, 222) it is formed with annular groove (1224,2224) on, is provided with chamber seal in the annular groove (1224,2224) (S1, S21), the chamber seal (S1, S21) be compressed in the needle (122,222) and the valve rod (121,221) it Between.

15. a kind of electric expansion valve (200), comprising:

Valve seat (130), the valve seat (130) include first port (131) and second port (132), the first port (131) It is used as fluid inlet, the first port (131) and the second port (132) with one of the second port (132) The other of be used as fluid outlet, the valve seat (130) further includes first chamber (C11) and valve opening (134), first chamber Room (C11) and the first port (131) are in fluid communication, and the first chamber (C11) and the second port (132) pass through By the valve opening (134) selective fluid communication；

According to claim 1 to needle component (120,220) described in any one of 14；And

Driving mechanism (110), the driving mechanism (110) drive the needle component (120,220) to move back and forth so that described Needle (122,222) and the valve opening (134) cooperate, to adjust the aperture of the valve opening (134).

16. electric expansion valve (200) according to claim 15, which is characterized in that the horse in the driving mechanism (110) It is defined second chamber (C12) up between the needle component (120,220), and the heart in the driving mechanism (110) The inside of axis (113) is formed with mandrel access (1131), the mandrel access (1131) and is formed in the valve rod (121,221) In valve stem passage (1215,2215) and needle access (1226,2226) fluid for being formed in the needle (122,222) It is connected to and constitutes balance channel, the balance channel is connected to the second chamber (C12) and the second port (132).