CN204387344U

CN204387344U - Electronic expansion valve

Info

Publication number: CN204387344U
Application number: CN201520007747.XU
Authority: CN
Inventors: 刘敬喜; 汪羽丰; 韩荣耀
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2015-01-06
Filing date: 2015-01-06
Publication date: 2015-06-10
Anticipated expiration: 2025-01-06

Abstract

An electronic expansion valve is provided, which includes: the valve component is used for regulating the flow of fluid flowing through the electronic expansion valve and comprises a valve body, a valve seat arranged in the valve body, a valve needle capable of opening and closing the valve seat, an actuating mechanism driving the valve needle to axially move and a driving mechanism providing power for the actuating mechanism, wherein the actuating mechanism comprises a main shaft capable of axially moving; and an electromagnetic retaining mechanism for retaining the spindle, the electromagnetic retaining mechanism including an electromagnet and an electromagnetic coil, the electromagnetic retaining mechanism being configured to energise the electromagnetic coil when the electromagnetic retaining mechanism is energised so as to actuate the electromagnet to act substantially perpendicularly on the spindle to retain the spindle in a first axial position in which the valve needle is able to adjust the opening of the valve seat, and to release the spindle to a second axial position when the electromagnetic retaining mechanism is de-energised, in which the valve needle closes the valve seat.

Description

Electric expansion valve

Technical field

The utility model relates to a kind of electric expansion valve.

Background technique

Electric expansion valve is the vitals in cooling/heating system, is mainly used in regulating the flow of refrigerant fluid.Traditional electric expansion valve generally comprises driving mechanism (stepper motor), actuator (thread screw mechanism), throttle mechanism (needle valve seat) and relevant assisting agency.

But traditional electric expansion valve is after power-off (such as, unexpected power down), and mechanism loses driving force due to thread screw, so electric expansion valve can not be closed automatically, liquid refrigerant fluid can be flowed in compressor along pipeline.When system restart, the compressor flowing into liquid refrigerant flows is easy to damage when being with liquid work.

Therefore, in order to block stream safely, usually at the upstream of electric expansion valve or downstream tandem one independently electromagnetic switch valve (be generally normally close valve, open when it powers up, close during power-off).Like this, when system cut-off, electromagnetic switch valve will close to block stream automatically.

But, adopt structure as above, on the one hand owing to adding an independently electromagnetic switch valve and add the overall cost of system, on the other hand in order to this electromagnetic switch valve of connecting, two soldering points will be increased (namely in pipeline, the entrance and exit place of electromagnetic switch valve), this not only adds the assembly cost of system but also adds the risk of system leak.

It is for electric expansion valve provides standby power supply that another kind realizes the method that electric expansion valve closes after a loss of power automatically, in the control panel of electric expansion valve, such as increase the super capacitor being used for storage of electrical energy or reserve battery is installed, but this method too increases the cost of electric expansion valve and needs more complicated controller.

Another method realizing that electric expansion valve closes after a loss of power automatically arranges to have dynamic iron, determine the electromagnetic mechanism of iron and electromagnetic coil, when electromagnetic coil is energized, determine iron adhesive move iron thus needle is mentioned, when electromagnetic coil power-off, the adhesive determined between iron and dynamic iron is thrown off thus is made needle fall and close valve seat.But when this application of installation is in large refrigerating capacity, needs the physical dimension of electromagnetic coil to design very large, thus cost is increased greatly, and when refrigerating capacity is large especially, this electromagnetic structure even possibly cannot realize.

Model utility content

An object of one or more mode of execution of the present utility model is to provide a kind of electric expansion valve can automatically closed after a loss of power.

Another object of one or more mode of execution of the present utility model is to provide and a kind ofly makes the electric expansion valve that the holistic cost of cooling/heating system is lower.

Another object of one or more mode of execution of the present utility model is to provide a kind of electric expansion valve making the Security of cooling/heating system higher.

Another object of one or more mode of execution of the present utility model is to provide a kind of electric expansion valve that can adapt to larger refrigerating capacity.

One or more objects to achieve these goals, according to the utility model aspect, provide a kind of electric expansion valve, it comprises: for regulating the valve member of the fluid flow flowing through described electric expansion valve, described valve member comprises valve body, the valve seat be arranged in described valve body, the needle that can open and close described valve seat, the actuator driving described needle to move axially and provide the driving mechanism of power for described actuator, and described actuator comprises can the main shaft of movement vertically, and for keeping the electromagnetism retaining mechanism of described main shaft, described electromagnetism retaining mechanism comprises electromagnet and electromagnetic coil, wherein, described electromagnetism retaining mechanism is configured to when described electromagnetism retaining mechanism powers up, described electromagnetic coil be powered up, thus activate described electromagnet and generally perpendicularly act on described main shaft so that described main shaft is remained on the first axial position, at described first axial position, described needle can regulate the aperture of described valve seat, when described electromagnetism retaining mechanism power-off, described main shaft is discharged into the second axial position, at described second axial position, described needle closes described valve seat.

In such configuration, because the gravity of main shaft and the parts such as the ut socket be connected with main shaft and needle bears primarily of component, the main effect of electromagnetic coil component is remained on the position of stretching out, so less electromagnetic coil can be adopted to reduce material and manufacture cost further.In addition, adopt this structure, electromagnetism retaining mechanism can be made more flexible relative to the layout of valve member.

In addition, because electric expansion valve itself has the function of closing when power-off, therefore do not need in the system applying this electric expansion valve, additionally to arrange independent electromagnetic switch valve or other valve members, because this reducing the holistic cost of system.In addition, owing to eliminating extra electromagnetic switch valve, therefore also reduce in the pipeline of system for connecting the tie point (soldering point) of this electromagnetic switch valve, thus reduce the risk of system leak on the one hand, reduce the assembly process of system and save human cost on the other hand.

According to the another aspect of the utility model mode of execution, electromagnet comprise fix relative to described electromagnetic coil determine iron and can relative to the described dynamic iron determining iron movement.

According to the another aspect of the utility model mode of execution, one end of described dynamic iron is provided with the first component, when described electromagnetism retaining mechanism powers up, described first component of described dynamic iron and the first end of described main shaft are engaged by the mode of form fit thus stop described main shaft to move axially, when described electromagnetism retaining mechanism powers up, the form fit between described first component of described dynamic iron and the described first end of described main shaft is thrown off thus is allowed described main shaft to move axially.

According to the another aspect of the utility model mode of execution, the described first end of described main shaft is provided with the groove of annular, when described electromagnetism retaining mechanism powers up, described first component to stretch out to be fastened in described groove thus stops described main shaft to move axially, when described electromagnetism retaining mechanism power-off, described first component is retracted to exit from described groove thus to allow described main shaft to move axially.

According to the another aspect of the utility model mode of execution, the described first end of described main shaft is provided with the bump of annular, when described electromagnetism retaining mechanism powers up, described first component stretches out to be engaged under described bump, or the groove being arranged on the end of described first component engages described bump by carrying out form fit with described bump thus stops described main shaft to move axially, when described electromagnetism retaining mechanism power-off, described first component is retracted, thus described first component is exited under described bump or the form fit between described groove and described bump is thrown off, move axially to allow described main shaft.

According to the another aspect of the utility model mode of execution, the described first end of described main shaft is provided with the groove of annular, described first component is provided with the first through hole that internal diameter is equal to or greater than the diameter of described main shaft, contiguous described first through hole is provided with and is communicated with described first through hole, internal diameter is less than the diameter of described main shaft but is equal to or greater than the second through hole of the internal diameter of described groove, described main shaft can pass described first through hole, when described electromagnetism retaining mechanism powers up, described first component is retracted to make described groove in described second through hole thus to make the perisporium of described second through hole be fastened in described groove, described main shaft is stoped to move axially thus, when described electromagnetism retaining mechanism power-off, described first component stretches out to enable described groove in described first through hole thus makes described main shaft through described first through hole, described main shaft is allowed to move axially thus.

According to the another aspect of the utility model mode of execution, the described first end of described main shaft is provided with the bump of annular, described first component is provided with the through hole that internal diameter is equal to or greater than the diameter of described bump, in described through hole, circumferentially direction is provided with the groove that can carry out the annular of form fit with described bump, described bump can pass described through hole, when described electromagnetism retaining mechanism powers up, described first component is retracted or stretches out to make a part for described groove engage with described bump thus stop described main shaft to move axially, when described electromagnetism retaining mechanism power-off, described first component stretches out or retracts throws off with the engaging of the described part with described bump that make described groove, and then enable described bump through described through hole thus allow described main shaft to move axially.

According to the another aspect of the utility model mode of execution, one end of described dynamic iron is provided with the first component, the first end of described main shaft is provided with the second component, described second component is can to move axially relative to main shaft cover but the mode that can not rotate is arranged on described main shaft cover, and described main shaft is can to rotate relative to described second component but the mode that can not move axially is arranged on described second component, described second component is being provided with opening towards the side of described dynamic iron, when described electromagnetism retaining mechanism powers up, described first component stretches out thus inserts described opening and moves axially also to stop described second component and then stop described main shaft to move axially, when described electromagnetism retaining mechanism power-off, described first component is retracted thus is exited to allow described second component to move axially from described opening and and then allow described main shaft to move axially.

According to the another aspect of the utility model mode of execution, one end of described dynamic iron is provided with the first component, the first end of described main shaft is provided with the second component, described second component is can to move axially relative to main shaft cover but the mode that can not rotate is arranged on described main shaft cover, and described main shaft is can to rotate relative to described second component but the mode that can not move axially is arranged on described second component, described second component is provided with bump at its outer circumferential side, when electromagnetism retaining mechanism powers up, described first component stretches out to be engaged under described bump, or the groove being arranged on the end of described first component engages by carrying out form fit with described bump, thus stop described second component move axially also and then stop described main shaft to move axially, when described electromagnetism retaining mechanism power-off, described first component is retracted, thus described first component is exited under described bump or the form fit between described groove and described bump is thrown off, move axially to allow described second component and and then allow described main shaft to move axially.

According to the another aspect of the utility model mode of execution, described second component is cylindrical member, and described second component to be engaged on the described first end of described main shaft by bearing unit and to be engaged on described main shaft cover by axial guides.

According to the another aspect of the utility model mode of execution, described first component is the rod member or the plate that are connected to described second component, or described first component and described second component are one.

According to the another aspect of the utility model mode of execution, described actuator also comprises: relative to the first supporting base that described valve body is fixing, be formed with through hole in described supporting base; And can slide in this through hole but the ut socket that can not rotate, the second end of described main shaft is connected with described needle via described ut socket.

According to the another aspect of the utility model mode of execution, described actuator also comprises the second supporting base be combined together with the upper opening of valve body, described first supporting base and described second supporting base are linked together by the elastic component be arranged on therebetween, or one is arranged to by described first supporting base and described second supporting base.

According to the another aspect of the utility model mode of execution, described actuator also comprises the guiding mechanism for guiding described main shaft to move axially.Described guiding mechanism comprises guide springs and guide rod, one end of described guide springs is fixed on described second supporting base, the other end of described guide springs is fixed on described main shaft, described guide rod is fixed on described second supporting base, and described guide springs is slidably attached to described guide rod by the slip ring be socketed on described guide rod.

By explanation provided herein, other application will become obvious.Should be appreciated that, the particular example described in this part and mode of execution are only for purpose of explanation instead of attempt to limit scope of the present utility model.

Accompanying drawing explanation

By the description referring to accompanying drawing, the feature and advantage of one or several mode of execution of the present utility model will become easier to understand, and accompanying drawing is not drawn in proportion, can zoom in or out some features to show the details of particular elements, in the accompanying drawings:

Fig. 1 is the sectional view of the electric expansion valve according to the utility model first mode of execution;

Fig. 2 is the view sub-anatomy of the electric expansion valve shown in Fig. 1;

Fig. 3 is the sectional view of main shaft in the electric expansion valve shown in Fig. 1 and electromagnetism retaining mechanism, and wherein electromagnetism retaining mechanism is in off-position;

Fig. 4 is the view sub-anatomy of main shaft in Fig. 3 and electromagnetism retaining mechanism;

Fig. 5 A, 5B, 5C and 5D show the working procedure of electric expansion valve;

Fig. 6 is the sectional view according to the main shaft in the electric expansion valve of the utility model second mode of execution and electromagnetism retaining mechanism, and wherein electromagnetism retaining mechanism is in off-position;

Fig. 7 is the view sub-anatomy of main shaft in Fig. 6 and electromagnetism retaining mechanism;

Fig. 8 is the sectional view according to the main shaft in the electric expansion valve of the utility model the 3rd mode of execution and electromagnetism retaining mechanism, and wherein electromagnetism retaining mechanism is in off-position; And

Fig. 9 is the view sub-anatomy of main shaft in Fig. 8 and electromagnetism retaining mechanism.

Embodiment

Description related to the preferred embodiment is only exemplary below, instead of the restriction to the utility model and application or purposes.In various figures, adopt identical reference character to represent identical parts, therefore for the structure of same parts by no longer repeated description.

First with reference to Fig. 1-4, the structure according to the electric expansion valve of the utility model first mode of execution is described.

Valve member 10 for regulating the flow of the fluid flowing through electric expansion valve and the electromagnetism retaining mechanism 60 of actuator for keeping and in relief valve parts 10 can be comprised according to electric expansion valve 1 of the present utility model.

Particularly, valve member 10 can comprise valve body 12.Valve body 12 is provided with the entrance 12-1 be connected with the inflow pipe 14 and outlet 12-2 be connected with outflow tube 16.Valve seat 18 can be set at the outlet 12-2 place of valve body 12.Electric expansion valve 1 can also comprise can open and close valve seat 18 needle 24, drive the actuator that moves axially of needle 24 and provide the driving mechanism of power for actuator.In the present embodiment, valve seat 18 and valve body 12 are integrated, but valve seat 18 and valve body 12 also can be parts separately and can arrange seal washer between to realize being tightly connected therebetween.In addition, the filter screen (not shown) of general cylindrical shape can be set in the valve pocket of valve body 12 to filter the impurity flow through in the fluid of this electric expansion valve.

In the example shown in the series of figures, driving mechanism can be the motor comprising stator 40 and rotor 42.Rotor 42 can rotate in stator 40.Sleeve 44 can be set between stator 40 and rotor 42 to realize the object of easy to assembly and easy sealing.The lower end of sleeve 44 is fixed on hereafter by the first supporting base 20 of description.

Actuator can comprise the second supporting base 21 be combined together with the upper opening 12-3 of valve body 12, the ut socket 22 that still can not rotate that can slide in the first supporting base 20, the main shaft 50 be threaded with ut socket 22.Seal ring 30 can be set between the cylindrical shell 45 being engaged to sleeve 44 outer circumferential side and valve body 12 to provide better sealing effect.Main shaft 50 can be fixedly connected with the rotation with rotor 42 with rotor 42 and rotate.First supporting base 20 and the second supporting base 21 can by being arranged on elastic component therebetween, such as spring (not shown) is linked together.Alternatively, the first supporting base 20 and the second supporting base 21 can be set to integral.

Especially, actuator also comprises the guiding mechanism for guiding main shaft 50 to move axially.This guiding mechanism comprises guide springs 46 and guide rod 48, one end of guide springs 46 is fixed on the first supporting base 20, the other end of guide springs 46 is fixed on main shaft 50, guide rod 48 is also fixed on the first supporting base 20, and guide springs 46 is slidably attached to guide rod 48 by the slip ring (not shown) be socketed on guide rod 48.When main shaft 50 moves axially, main shaft 50 drives guide springs 46 to move axially and then drive slip ring to move axially, and slip ring moves axially along guide rod 48 simultaneously, and main shaft 50 thus can be guided better to move axially and axial dipole field do not occur.

Be formed with through hole 23 in first supporting base 20, ut socket 22 can slide but can not rotate in this through hole 23.Particularly, through hole 23 can have non-circular or polygonal inner peripheral surface, such as roughly octagonal structure.Ut socket 22 can have the non-circular or polygonal outer surface matched with the non-circular inner peripheral surface of this through hole 23, such as octagonal structure.

The structure of the first supporting base 20 and ut socket 22 is not limited thereto, but can for can allow to slide therebetween but can not any structure in relative rotation.Such as, the through hole 23 of the first supporting base 20 can have circular inner peripheral surface, but perimeter surface is formed with keyway or key within it.Ut socket can have circular outer surface, but is formed with the key or keyway that match with the keyway on the first supporting base or key on its outer circumferential surface.

Ut socket 22 can comprise tool female first paragraph 22-1 and not have threaded second segment 22-2.Second end (lower end) 50-2 of main shaft 50 is formed with outside thread.Second end 50-2 of main shaft 50 can be connected with needle 24 via ut socket 22.Particularly, the converting rotary motion of rotor 42 and main shaft 50 can with the screw-internal thread fit of ut socket 22 to form thread screw mechanism, thus be moving axially of ut socket 22 by the outside thread of the second end 50-2 of main shaft 50.

One end of needle 24 can be engaged in the second segment 22-2 of ut socket 22, and the other end of needle 24 can coordinate to open and close valve seat 18 with valve seat 18.In addition, needle 24 can regulate the aperture of electric expansion valve, to realize the function of accurate flow control fluid with the distance of valve seat 18.Needle 24 can be engaged in ut socket 22 regularly.Alternately, needle 24 can be slidably fitted in ut socket 22 and to exert pressure to realize better sealing by spring in its one end.Particularly, be provided with annular groove 27 (shown in Figure 2) in the end of the second segment 22-2 of ut socket 22, the elastic clip 29 of annular keeps needle 24 and is held in the end of second segment 22-2 of ut socket 22 by needle 24.By above-mentioned layout, needle 24 can move axially together with ut socket 22.In addition, be provided with stepped part 22-3 between the first paragraph 22-1 of ut socket 22 and second segment 22-2, between stepped part 22-3 and needle 24, be provided with Compress Spring 28.When moving down when ut socket 22 and abut with valve seat 18 when needle 24; Compress Spring 28 is suitable for power to make to have between needle 24 and valve seat 18 by applying elastic force from one end of needle 24; this protects needle on the one hand and valve seat is not damaged, provides reliable sealing effect on the other hand.

In order to provide better sealing effect, can arrange in the end coordinated with valve seat 18 of needle 24 can against the sealing block (not shown) of the end face of valve seat 18.

Be formed with stepped part 22-4 at the outer circumferential side of one end coordinated with needle 24 of ut socket 22, between stepped part 22-4 and the first supporting base 20, be provided with Compress Spring 26.Compress Spring 26 can provide downward spring force to move to auxiliary nut sleeve 22, needle 24 and main shaft 50 when the electric expansion valve power-off described the position making needle 24 close valve seat 18 below for ut socket 22.It will be understood by those skilled in the art that therefore Compress Spring 26 can be omitted because ut socket 22, needle 24 and main shaft 50 itself have certain deadweight to provide this power moved downward.

Electromagnetism retaining mechanism 60 can be arranged on the upside of valve member 10.Electromagnetism retaining mechanism 60 is configured for keeping main shaft 50.Particularly, electromagnetism retaining mechanism 60 comprises electromagnet 62, 64 and produce the electromagnetic coil (not shown) of magnetic force when powering up, electromagnetism retaining mechanism 60 can be configured to when electromagnetism retaining mechanism 60 powers up, electromagnetic coil be powered up, thus activate electromagnet 62, (namely 64 generally perpendicularly act on main shaft 50, electromagnet 62, what 64 directions of movement when activateding were approximately perpendicular to main shaft 50 moves axially direction) so that main shaft 50 is remained on the first axial position, at described first axial position, needle 24 can the aperture of regulating valve seat 18, when 60 power-off of electromagnetism retaining mechanism, main shaft 50 is discharged into the second axial position, at described second axial position, needle 24 closes valve seat 18.

Therefore, when the unexpected power-off of electric expansion valve, although the actuator be made up of thread screw mechanism can not move needle to close valve seat, but because the main shaft as actuator's part is discharged by electromagnetism retaining mechanism such as under its own weight or under the effect of the bias force of other resilient members, fall back to the position that needle can be made to close valve seat, therefore reliably can close electric expansion valve.Thus the technical solution of the utility model can realize the function of automatically closing electric expansion valve when power-off.

According to a mode of execution of the present utility model, electromagnet 62,64 can comprise fix relative to electromagnetic coil determine iron 62 and can relative to the dynamic iron 64 determining iron 62 movement, wherein electromagnetic coil is arranged in electromagnetism retaining mechanism housing 61.In order to easy to assembly and the dynamic iron 64 of guiding move, the sleeve 63 of general cylindrical shape can be set in electromagnetism retaining mechanism housing 61.Determine iron 62 can be fixed to electromagnetism retaining mechanism housing 61 or be fixed to sleeve 63.Dynamic iron 64 can slide relative to determining iron 62 in sleeve 63.Iron 64 is moved determining to be provided with spring 67 between iron 62 and dynamic iron 64 with bias voltage.Can also be provided with between dynamic iron 65 and electromagnetism retaining mechanism housing 61 and seal sprue 65.

One end of dynamic iron 64 is provided with the first component 66, when electromagnetism retaining mechanism 60 powers up, first component 66 of dynamic iron 64 and the first end 50-1 of main shaft 50 are engaged by the mode of form fit thus stop main shaft 50 to move axially, when 60 power-off of electromagnetism retaining mechanism, the form fit between the first component 66 of dynamic iron 64 and the first end 50-1 of main shaft 50 is thrown off thus allows main shaft 50 to move axially.

Particularly, the first end 50-1 of main shaft 50 is provided with the groove 52 of annular, when electromagnetism retaining mechanism 60 powers up, determines iron 62 and attracts dynamic iron 64 to move it, thus make the first component 66 being connected to dynamic iron 64 stretch out to be fastened in groove 52, thus main shaft 50 is stoped to move axially.When 60 power-off of electromagnetism retaining mechanism, determine iron 62 and no longer attract dynamic iron 64, dynamic iron 64 is retracted under the effect of spring 67, thus makes the first component 66 being connected to dynamic iron 64 retract to exit from groove 52, thus allows main shaft 50 to move axially.

In addition, although the first component 66 is described as the parts linked together with dynamic iron 64 in the present embodiment, the first component 66 and dynamic iron 64 also can be one.

In addition, by multiple bolt 68, electromagnetism retaining mechanism housing 61 can be attached to the shell 70 of electric expansion valve.A part for main shaft 50, stator 40, rotor 42 and sleeve 44 hold within it by shell 70, and shell 70 can be press-fitted on cylindrical shell 45 by elastic seal ring 31.Cylindrical shell 45 and valve body 12 are fitted together by tightening nut 36.Especially, the first component 66 can coordinate with main shaft 50 through the opening 71 in shell 70.

Preferably, can be provided with main shaft cover 54, main shaft cover 54 is engaged to shell 70 regularly and the position corresponding with opening 70 is provided with opening 58.The first end 50-1 of main shaft 50 is engaged to main shaft cover 54 by bearing 59.First component 66 can carry out form fit through the opening 71 in shell 70 and through the opening 58 of main shaft cover 54 with the groove 52 of main shaft 50.

Alternatively, the first end 50-1 of main shaft 50 is provided with the bump (not shown) of annular, when electromagnetism retaining mechanism 60 powers up, determining iron 62 attracts dynamic iron 64 to move it, thus make the first component 66 being connected to dynamic iron 64 stretch out to be engaged under this bump, or the groove being arranged on the end of the first component 66 engages by carrying out form fit with this bump, thus main shaft 50 is stoped to move axially.When 60 power-off of electromagnetism retaining mechanism, determine iron 62 and no longer attract dynamic iron 64, dynamic iron 64 is retracted under the effect of spring 67, thus the first component 66 being connected to dynamic iron 64 is retracted, thus the first component 66 is exited under described bump or the form fit between groove and bump is thrown off, move axially to allow main shaft 50.

Alternatively, the first end 50-1 of main shaft 50 is provided with the bump (not shown) of annular, first component 66 is provided with the through hole that internal diameter is equal to or greater than the diameter of this bump, in this through hole, circumferentially direction is provided with the groove that can carry out the annular of form fit with this bump, and this bump can pass this through hole.When electromagnetism retaining mechanism 60 powers up, determining iron 62 attracts dynamic iron 64 to move it, thus make the first component 66 being connected to dynamic iron 64 retract (in this case, determining iron 62 attracts dynamic iron 64 move towards the direction away from main shaft 50 thus drive the first component 66 to move away from main shaft 50) or stretch out (in this case, determining iron 62 attracts dynamic iron 64 move towards the direction close to main shaft 50 thus drive the first component 66 close to main shaft 50) to make a part for this groove engage with this bump, thus stop main shaft 50 to move axially.When 60 power-off of electromagnetism retaining mechanism, determine iron 62 and no longer attract dynamic iron 64, dynamic iron 64 stretches out or retracts under the effect of spring 67, thus make the first component 66 being connected to dynamic iron 64 stretch out to make a described part for described groove to throw off with the engaging of described bump, and then make this bump through this through hole thus allow main shaft 50 to move axially.

Below with reference to Fig. 5 A, 5B, 5C and 5D, the working procedure according to the electric expansion valve 1 of the utility model first mode of execution is described.In Fig. 5 A-Fig. 5 D, alphabetical D represents the distance of main shaft 50 top apart from certain level face, and alphabetical V represents the distance of ut socket 22 lower end apart from certain level face.

Each parts that Fig. 5 A shows electric expansion valve 1 are in original state.In this condition, D is maximum value, and V is minimum value (being such as zero).From this state, first power up for stator 40, make the electromagnetic coil in electromagnetism retaining mechanism housing 61 keep power-off, therefore main shaft 50 starts to rotate under the drive of rotor 42 simultaneously.Due to the second end 50-2 of main shaft 50 and ut socket 22 for screw-thread fit and ut socket 22 can not rotate, so main shaft 50 will axially upwardly move (being the arrow indicated direction in main shaft in fig. 5) in the process rotated.Meanwhile, owing to not powering up, thus dynamic iron 64 can not be upper mobile at the longitudinal direction (among Fig. 5 A-Fig. 5 Ds for be approximately perpendicular to the direction of main shaft in arrow direction indication) substantially vertical with the axial direction of main shaft 50 relative to determining iron 62.Then, main shaft 50 axially upwardly moves until arrive the first axial position.Now, each parts of electric expansion valve will be in the state shown in Fig. 5 B.

Under the state shown in Fig. 5 B (D is minimum value such as zero, V is minimum value), needle 24 still closes valve seat 18.Now, power up to the electromagnetic coil in electromagnetism retaining mechanism housing 61, electromagnetic coil will make iron 64 and determine to produce magnetic force between iron 62 thus make to determine iron 62 to attract dynamic iron 64.The first component 66 be connected with dynamic iron 64 to move and therefore preferably across the opening 58 of main shaft cover 54 towards determining iron 62, then the first component 66 to be engaged in the groove 52 of the first end 50-1 of main shaft 50 thus to stop main shaft 50 to move axially, such as by the first component 66, with groove 52 complementation or to interlock thus the part engaged coordinates in shape.In addition, stator 40 continues to power up, and continuation rotates by main shaft 50.But because main shaft 50 is locked and can not move up again, so under the effect of the screw pair of main shaft 50 and ut socket 22, ut socket 22 will be pulled upward, thus drive needle 24 moves upward to make electric expansion valve 1 realize specific aperture.Now, each parts of electric expansion valve will be in the state shown in Fig. 5 C.

Under the state shown in Fig. 5 C (D be minimum value such as zero, V can between minimum value and maximum value), by carrying out the specific control controlling realize needle 24 stroke to stator 40, thus the aperture of electric expansion valve 1 can be controlled.In this condition, the electromagnetic coil in electromagnetism retaining mechanism housing 61 continues to power up, and stator 40 can power up according to control overflow or power-off, forward or reverse.Due to when main shaft 50 is in the first axial position, the confining force of electromagnetism retaining mechanism 60 pairs of main shafts 50 be provided by the first component 50 instead of provided by dynamic iron 64 and the magnetic attraction of determining between iron 62, and dynamic iron 64 and the magnetic attraction of determining between iron 62 are only used to provide and make the first component 50 vertically move, thus only need to provide less magnetic attraction, thus the size of electromagnetic coil and dynamic iron, the size of determining iron can obtain less, thus reduce the overall dimensions of electromagnetism retaining mechanism, reduce its manufacture cost and effectively improve electric expansion valve reliability of operation.

When electric expansion valve 1 power-off suddenly, each parts of electric expansion valve are by the state be in shown in Fig. 5 D (D is maximum value, and V is minimum value).In this condition, due to the electromagnetic coil power-off in electromagnetism retaining mechanism housing 61, determine iron 62 and no longer will attract dynamic iron 64, dynamic iron 64 moves away from determining iron 62 along the longitudinal direction by under the effect of spring 67, and therefore the engaging between the first component 66 be connected with dynamic iron 64 and the groove 52 of main shaft 50 will throw off and preferably exit opening 58.Now, main shaft 50, ut socket 22 and needle 24 fall downwards (in Fig. 5 D arrow indicated direction) together with under gravity and under the effect of the spring force of Compress Spring 26, make needle 24 close valve seat 18.

After this, before electric expansion valve 1 restores electricity and carries out normal running, first rotor 42 rotates forward or counterrotating the is certain number of turns can be driven to make main shaft 50 and ut socket 22 reach initial position described in Fig. 5 A, then can start the normal running as shown in Fig. 5 A, 5B and 5C.

It is to be noted, the position (D is minimum value) of the main shaft 50 shown in Fig. 5 B and 5C is corresponding to the first axial position described in claim, and the position (D is maximum value) shown in Fig. 5 A and 5D is corresponding to the second axial position described in claim.In addition, the distance between the first axial position and the second axial position can be set to the range during aperture being more than or equal to needle 24 regulating valve seat 18.

Describe according to the second mode of execution of the present utility model referring to Fig. 6-7.In this second embodiment, have employed the reference character identical with the first mode of execution to refer to identical parts, therefore will omit the description to these same parts.

The difference of the second mode of execution and the first mode of execution is the electromagnetism retaining mechanism 60' with different structure.Particularly, in this second embodiment, the first end 50-1 of main shaft 50 is provided with the groove 52 of annular.Determining iron 62 is arranged between sleeve 63 and electromagnetism retaining mechanism housing 61, and dynamic iron 64 to be arranged in electromagnetism retaining mechanism housing 61 or sleeve 63 and to be subject to spring 67 bias voltage determined between iron 62 and dynamic iron 64 with being slidably matched.First component 66 is connected to one end contrary with determining iron 62 of dynamic iron 64, and the first component 66 is provided with the first through hole 66-1 that internal diameter is equal to or greater than the diameter of main shaft 50, contiguous first through hole 66-1 be provided be communicated with the first through hole 66-1, internal diameter is less than the diameter of main shaft 50 but is equal to or greater than the second through hole 66-2 of the internal diameter of groove 52.Preferably, the first component 66 enters main shaft cover 54 through the opening 58 of main shaft cover 54.Main shaft 50 can pass the first through hole 66-1.When electromagnetism retaining mechanism 60, " power up, electromagnetic coil namely in electromagnetism retaining mechanism housing 61 is when powering up, main shaft 50 has now been in the first axial position, and powering up of electromagnetic coil will make iron 64 and determine to produce magnetic force between iron 62 thus make to determine iron 62 to attract dynamic iron 64.The first component 66 be connected with dynamic iron 64 moves towards determining iron 62 and therefore retracts, then the second through hole 66-2 of the first component 66 is engaged in the groove 52 of the first end 50-1 of main shaft 50, due to the relation between the internal diameter of the second through hole 66-2 and the diameter of main shaft 50 and groove 52 internal diameter, to be in making the second through hole 66-2 in groove 52 thus to make the perisporium of the second through hole 66-2 be fastened in groove 52, stoping main shaft 50 to move axially thus.When electromagnetism retaining mechanism 60 " power up, electromagnetic coil power-off namely in electromagnetism retaining mechanism housing 61 time; determine iron 62 and no longer will attract dynamic iron 64; dynamic iron 64 stretches out away from determining iron 62 along the longitudinal direction by under the effect of spring 67; the first component 66 is connected with dynamic iron 64 will slide into the first through hole 66-1 from the second through hole 66-2; due to the relation between the internal diameter of the first through hole 66-1 and the diameter of main shaft 50, therefore the engaging between main shaft 50 with the first component 66 will throw off and will pass the first through hole 66-1 under gravity and fall downwards.

Describe according to the 3rd mode of execution of the present utility model referring to Fig. 8-9.Have employed the reference character identical with the first mode of execution in the third embodiment to refer to identical parts, therefore will omit the description to these same parts.

The difference of the 3rd mode of execution and the first mode of execution is the electromagnetism retaining mechanism 60 with different structure ".Particularly, in the third embodiment, determine iron 62 can be fixed to electromagnetism retaining mechanism housing 61 or be fixed to sleeve 63.Dynamic iron 64 can slide relative to determining iron 62 in sleeve 63.Iron 64 is moved determining to be provided with spring 67 between iron 62 and dynamic iron 64 with bias voltage.Can also be provided with between dynamic iron 64 and electromagnetism retaining mechanism housing 61 and seal sprue 65.One end of dynamic iron 64 is provided with the first component 66, the first end 50-1 of main shaft 50 is provided with the second component 55, second component 55 is can to move axially relative to main shaft cover 54 but the mode that can not rotate is arranged on main shaft cover 54, such as by being separately positioned on the axial guides complementary in shape on main shaft cover 54 and the second component 55, the steering channel such as cooperatively interacted and guide protrusion or the keyway cooperatively interacted or key, and main shaft 50 is can to rotate relative to the second component 55 but the mode that can not move axially is arranged on the second component 55, second component 55 is being provided with opening 56 towards the side of dynamic iron 64.When electromagnetism retaining mechanism 60, " when electromagnetic coil when powering up, in electromagnetism retaining mechanism housing 61 powers up; main shaft 50 has now been in the first axial position, powering up of electromagnetic coil will make iron 64 and determine to produce magnetic force between iron 62 thus make to determine iron 62 to attract dynamic iron 64.The first component 66 be connected with dynamic iron 64 stretches out thus inserts the opening 56 of the second component 55, thus stop the second component 55 to move axially also and then stop main shaft 50 to move axially, when electromagnetism retaining mechanism 60 is " during power-off, during electromagnetic coil power-off namely in electromagnetism retaining mechanism housing 61, determine iron 62 and no longer will attract dynamic iron 64, dynamic iron 64 is retracted along the longitudinal direction by under the effect of spring 67, the first component 66 be connected with dynamic iron 64 is retracted thus exits from opening 56, allow the second component 55 to move axially also thus and then allow main shaft 50 to move axially, second component 55 and main shaft 50 will fall downwards under gravity.

Alternatively, second component 55 is can to move axially relative to main shaft cover 54 but the mode that can not rotate is arranged on main shaft cover 54, and main shaft 50 is can to rotate relative to the second component 55 but the mode that can not move axially is arranged on the second component 55, second component 55 is provided with bump (not shown) at its outer circumferential side, when electromagnetism retaining mechanism 60 powers up, determining iron 62 attracts dynamic iron 64 to move it, thus make the first component 66 being connected to dynamic iron 64 stretch out to be engaged under this bump, or the groove being arranged on the end of the first component 66 engages by carrying out form fit with this bump, thus stop the second component 55 to move axially and and then stop main shaft 50 to move axially.When 60 power-off of electromagnetism retaining mechanism, determine iron 62 and no longer attract dynamic iron 64, dynamic iron 64 is retracted under the effect of spring 67, and then the first component 66 being connected to dynamic iron 64 is retracted, thus the first component 66 is exited under described bump or the form fit between groove and bump is thrown off, move axially to allow the second component 55 and and then allow main shaft 50 to move axially.

Especially, the second component 55 is cylindrical member, and the second component 55 is engaged on the first end 50-1 of main shaft 50 by bearing unit 57.

Particularly, in the third embodiment, because main shaft 50 and the first component 66 be arranged on dynamic iron 54 rubbing contact do not occur, even do not come in contact, therefore can reduce the wearing and tearing of the two thus its working life can be improved further.

Although describe numerous embodiments of the present utility model above with reference to Fig. 1-9, it should be appreciated by those skilled in the art that and can make further modification and/or improvement to aspects more of the present utility model.

Although described various mode of execution of the present utility model in detail at this, but should be appreciated that the utility model is not limited to the embodiment described in detail and illustrate here, other modification and variant can be realized when not departing from essence of the present utility model and scope by those skilled in the art.All these modification and variant all fall in scope of the present utility model.And all components described here can be replaced by component equivalent in other technologies.

Claims

1. an electric expansion valve (1), comprising:

For regulating the valve member (10) flowing through the fluid flow of described electric expansion valve (1), described valve member (10) comprises valve body (12), the valve seat (18) be arranged in described valve body (12), the needle (24) that can open and close described valve seat (18), the actuator driving described needle (24) to move axially and provide the driving mechanism of power for described actuator, and described actuator comprises can the main shaft (50) of movement vertically; And

For keeping the electromagnetism retaining mechanism (60 of described main shaft (50); 60'; 60 "), described electromagnetism retaining mechanism (60; 60'; 60 " electromagnet (62,64) and electromagnetic coil) is comprised,

Wherein, described electromagnetism retaining mechanism (60; 60'; 60 ") be configured to when described electromagnetism retaining mechanism (60) powers up, described electromagnetic coil be powered up; thus activate described electromagnet (62,64) and generally perpendicularly act on described main shaft (50) so that described main shaft (50) is remained on the first axial position; at described first axial position; described needle (24) can regulate the aperture of described valve seat (18), when described electromagnetism retaining mechanism (60; 60'; 60 ") during power-off, described main shaft (50) is discharged into the second axial position, at described second axial position, described needle (24) closes described valve seat (18).

2. electric expansion valve as claimed in claim 1, wherein, described electromagnet (62,64) comprises fixing relative to the described electromagnetic coil iron (62) and can relative to the described dynamic iron (64) determining iron (62) movement determined.

3. electric expansion valve as claimed in claim 2, wherein, is provided with the first component (66), when described electromagnetism retaining mechanism (60 in one end of described dynamic iron (64); 60'; When 60 ") powering up; described first component (66) of described dynamic iron (64) and the first end (50-1) of described main shaft (50) are engaged by the mode of form fit thus stop described main shaft (50) to move axially, when described electromagnetism retaining mechanism (60; 60'; 60 ") during power-off, the form fit between described first component (66) of described dynamic iron (64) and the described first end (50-1) of described main shaft (50) is thrown off thus is allowed described main shaft (50) to move axially.

4. electric expansion valve as claimed in claim 3, wherein, the described first end (50-1) of described main shaft (50) is provided with the groove (52) of annular, when described electromagnetism retaining mechanism (60) powers up, described first component (66) to be stretched out to be fastened in described groove (52) thus is stoped described main shaft (50) to move axially, when described electromagnetism retaining mechanism (60) power-off, described first component (66) is retracted to exit from described groove (52) thus to allow described main shaft (50) to move axially.

5. electric expansion valve as claimed in claim 3, wherein, the described first end (50-1) of described main shaft (50) is provided with the bump of annular, when described electromagnetism retaining mechanism (60) powers up, described first component (66) stretches out to be engaged under described bump, or the groove being arranged on the end of described first component (66) engages described bump by carrying out form fit with described bump thus stops described main shaft (50) to move axially, when described electromagnetism retaining mechanism (60) power-off, described first component (66) is retracted, thus described first component (66) is exited under described bump or the form fit between described groove and described bump is thrown off, move axially to allow described main shaft (50).

6. electric expansion valve as claimed in claim 3, wherein, the described first end (50-1) of described main shaft (50) is provided with the groove (52) of annular, described first component (66) is provided with the first through hole (66-1) that internal diameter is equal to or greater than the diameter of described main shaft (50), contiguous described first through hole (66-1) is provided with and is communicated with described first through hole (66-1), internal diameter is less than the diameter of described main shaft (50) but is equal to or greater than second through hole (66-2) of the internal diameter of described groove (52), described main shaft (50) can pass described first through hole (66-1), when described electromagnetism retaining mechanism (60') powers up, described first component (66) retracts described groove (52) is in described second through hole (66-2) thus makes the perisporium of described second through hole (66-2) be fastened in described groove (52), described main shaft (50) is stoped to move axially thus, when described electromagnetism retaining mechanism (60') power-off, described first component (66) is stretched out to make described groove (52) to be in described first through hole (66-1) thus is made described main shaft (50) pass described first through hole (66-1), described main shaft (50) is allowed to move axially thus.

7. electric expansion valve as claimed in claim 3, wherein, the described first end (50-1) of described main shaft (50) is provided with the bump of annular, described first component (66) is provided with the through hole that internal diameter is equal to or greater than the diameter of described bump, in described through hole, circumferentially direction is provided with the groove that can carry out the annular of form fit with described bump, described bump can pass described through hole, when described electromagnetism retaining mechanism (60') powers up, described first component (66) is retracted or is stretched out a part for described groove is engaged with described bump thus stops described main shaft (50) to move axially, when described electromagnetism retaining mechanism (60') power-off, described first component (66) is stretched out or is retracted and to throw off with the engaging of the described part with described bump that make described groove, and then described bump is moved axially to allow described main shaft (50) through described through hole.

8. electric expansion valve as claimed in claim 2, wherein, one end of described dynamic iron (64) is provided with the first component (66), the first end (50-1) of described main shaft (50) is provided with the second component (55), described second component (55) is can to move axially relative to main shaft cover (54) but the mode that can not rotate is arranged on described main shaft cover (54), and described main shaft (50) is can to rotate relative to described second component (55) but the mode that can not move axially is arranged on described second component (55), described second component (55) is being provided with opening (56) towards the side of described dynamic iron (64), when described electromagnetism retaining mechanism is (when 60 ") power up, described first component (66) is stretched out thus inserted described opening (56) and moves axially also to stop described second component (55) and then stop described main shaft (50) to move axially, when described electromagnetism retaining mechanism is (during 60 ") power-off, described first component (66) is retracted thus is exited to allow described second component (55) to move axially from described opening (56) and and then allow described main shaft (50) to move axially.

9. electric expansion valve as claimed in claim 2, wherein, one end of described dynamic iron (64) is provided with the first component (66), the first end (50-1) of described main shaft (50) is provided with the second component (55), described second component (55) is can to move axially relative to main shaft cover (54) but the mode that can not rotate is arranged on described main shaft cover (54), and described main shaft (50) is can to rotate relative to described second component (55) but the mode that can not move axially is arranged on described second component (55), described second component (55) is provided with bump at its outer circumferential side, when described electromagnetism retaining mechanism (60) powers up, described first component (66) stretches out to be engaged under described bump, or the groove being arranged on the end of described first component (66) engages by carrying out form fit with described bump, thus stop described second component (55) move axially also and then stop described main shaft (50) to move axially, when described electromagnetism retaining mechanism (60) power-off, described first component (66) is retracted, thus described first component (66) is exited under described bump or the form fit between described groove and described bump is thrown off, move axially to allow described second component (55) and and then allow described main shaft (50) to move axially.

10. electric expansion valve as claimed in claim 8 or 9, wherein, described second component (55) is cylindrical member, and the described first end (50-1) that described second component (55) is engaged in described main shaft (50) by bearing unit (57) is gone up and is engaged on described main shaft cover (54) by axial guides.

11. electric expansion valves as claimed in claim 8 or 9, wherein, described first component (66) is for being connected to rod member or the plate of described second component (55), or described first component (66) is one with described second component (55).

12. electric expansion valves as claimed in any one of claims 1-9 wherein, wherein, described actuator also comprises: relative to the first supporting base (20) that described valve body (12) is fixing, be formed with through hole (23) in described first supporting base (20); And can slide but the ut socket (22) that can not rotate in this through hole (23), second end (50-2) of described main shaft (50) is connected with described needle (24) via described ut socket (22).

13. electric expansion valves as claimed in claim 12, wherein, described actuator also comprises the second supporting base (21) be combined together with the upper opening of described valve body (12), described first supporting base (20) and described second supporting base (21) are linked together by the elastic component be arranged on therebetween, or described first supporting base (20) is arranged to one with described second supporting base (21).

14. electric expansion valves as claimed in claim 13, wherein, described actuator also comprises the guiding mechanism for guiding described main shaft (50) to move axially.

15. electric expansion valves as claimed in claim 14, wherein, described guiding mechanism comprises guide springs (46) and guide rod (48), one end of described guide springs (46) is fixed on described first supporting base (20), the other end of described guide springs (46) is fixed on described main shaft (50), described guide rod (48) is fixed on described first supporting base (20), and described guide springs (46) is slidably attached to described guide rod (48) by the slip ring be socketed on described guide rod (48).