CN110296264A

CN110296264A - Electric expansion valve

Info

Publication number: CN110296264A
Application number: CN201810243059.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2019-10-01
Anticipated expiration: 2038-03-23
Also published as: CN110296264B; WO2019179517A1; JP2021516319A; JP7018519B2

Abstract

The present invention provides a kind of electric expansion valve, comprising: valve body and valve seat, valve body have valve chamber, and valve seat is equipped with the first valve port；Rotor assembly, rotor assembly include rotor and screw rod, and rotor is directly or indirectly fixedly connected with screw rod, and screw rod has external thread part；Support frame, support frame are fixedly connected with the valve body, and support frame includes mating groove and the first mounting hole, and the first mounting hole is matched with screw rod；Nut, nut include auxiliary section and the internal thread part that is threadedly engaged with external thread part, and auxiliary section can carry out axial elevating movement along mating groove；Core component, core component is fixedly connected with nut, effect is threadedly engaged by external thread part and internal thread part, core component can carry out axial elevating movement in valve chamber, and core component includes attachment base and spool, and attachment base is fixedly connected with valve rod, spool has valve core head, valve core head can be additionally provided with the second valve port close to or away from the first valve port, spool, and valve rod can be close to or away from the second valve port.Pass through the optimization design to electric expansion valve, eliminate slowdown type geared system and bellows structure, product overall structure is simple and reduces the miniaturization for realizing coil to the power output demand of coil component, and the small-large flow that electric expansion valve is able to achieve in small driving force is adjusted.

Description

Electric expansion valve

Technical field

The present invention relates to refrigeration control technical fields, and in particular to a kind of electric expansion valve for adjusting cold medium flux.

Background technique

In cooling and warming technical field, electric expansion valve is the cold medium flux control unit of heating-cooling equipment, mainly by Two parts composition, a part are that body portion is adjusted for flow, and another part is the coiler part for driving.

Fig. 1 is a kind of electric expansion valve with small flow regulating function in background technique.Its coil part includes: forever Magnetic-type stepper motor 1 ', the spur gear deceleration device 2 ' to slow down with three-level have and motor rotary motion is converted to screw rod hangs down The screw thread auxiliary structure 4 ' directly moved, screw thread auxiliary structure 4 ' are formed with threaded portion 5 ', screw rod 3 ', and body portion includes valve body 8, big valve Mouth 10 ', the inner cavity of valve body 8 accommodate bellows 6 ', and bellows 6 ' is fixedly connected with valve rod 7 ', and valve rod 7 ' drives needle portion 9 ' to exist The inner cavity of valve body 8 carries out axial elevating movement to adjust the stream for the refrigerant for flowing through big valve port 10 ' close to or away from big valve port 10 ' Amount, needle portion 9 ' are additionally provided with small valve port 91 ', and valve rod 7 ' can move up and down small to open or close under the action of bellows 6 ' Valve port 91 ' is fixedly connected with baffle 92 ' on valve rod 7 ', product is briefly described below with reference to actuation principle and makees flowing mode: by air-conditioning The stepper motor 1 ' of the electronic controller control electric expansion valve of system drives deceleration device 2 ', passes through screw rod 3 ' and threaded portion 5 ' Be threadedly engaged effect screw rod 3 ' move downward, by steel ball and force transferring part bushing effect move downward valve rod 7 ' also, this When bellows 6 ' be constantly stretched effect, needle portion 9 ' moves closer to big valve port 10 '；When applying reverse impulse, by ripple The elastic returning of pipe 6 ' acts on, and valve rod 7 ' constantly moves upwards, and valve rod 7 ' is gradually moved towards the direction far from small valve port 91 ', small Valve port 91 ' is opened, and drives needle portion 9 ' whole towards far from big valve port when the mobile lower end surface as fixing sleeve of baffle 92 ' abuts 10 ' direction movement, program structure is complex, and the presence of slowdown type geared system needs coil component to provide bigger driving Power is opened and closed valve, and returning by means of bellows 6 ' is generally required in electric expansion valve size cold medium flux adjustment process Phenomena such as multiple power effect is just opened, but with the long-time service of product, and bellows 6 ' is also easy to produce aging just can not be successfully reality How existing open and close valve, in view of this advanced optimize design to electronic expansion valve structure, designs a kind of product structure more Simply, it is those skilled in the art's technology urgently to be resolved that small driving force, which is also able to achieve the small-large flow adjusting to electric expansion valve, Problem.

Summary of the invention

The main purpose of the present invention is to provide a kind of electric expansion valve, product structure is relatively simple and in small driving masterpiece The small-large flow adjusting to electric expansion valve is also able to achieve under.

To achieve the goals above, the present invention provides a kind of electric expansion valve, comprising:

Valve body and valve seat, valve body have valve chamber, and valve seat is equipped with the first valve port；Rotor assembly, rotor assembly include rotor and Screw rod, rotor are directly or indirectly fixedly connected with screw rod, and screw rod has external thread part；

Support frame, support frame are fixedly connected with the valve body, and support frame includes mating groove and the first mounting hole, the first mounting hole with Screw rod matches；Nut, nut include auxiliary section and the internal thread part that is threadedly engaged with external thread part, and auxiliary section can be along matching It closes slot and carries out axial elevating movement；Core component, core component are fixedly connected with nut, pass through external thread part and internal thread part It is threadedly engaged effect, core component can carry out axial elevating movement in valve chamber, and core component includes attachment base and spool, connection Seat is fixedly connected with valve rod, and spool has valve core head, and valve core head can be additionally provided with the second valve close to or away from the first valve port, spool Mouthful, valve rod can be close to or away from the second valve port.

Electric expansion valve provided by the present application, core component are fixedly connected with nut, are matched by the screw thread of screw rod and nut Cooperation is used, and so that core component is carried out axial elevating movement in valve chamber, is eliminated complicated slowdown type geared system and ripple Pipe structure greatly reduces driving force needed for coil component, further excellent by the core component structure to electric expansion valve Change design, core component includes spool and attachment base, is fixedly connected with attachment base with valve rod, and spool can be close to or away from first Valve port, valve rod can be close to or away from the second valve ports, and core component is acted on according to the screw thread transmitting of screw rod and nut can be in valve chamber The axial elevating movement of interior progress, to realize that the small-large flow to electric expansion valve is adjusted, integral product structure is relatively simple, small Driving force effect is also able to achieve the small-large flow adjusting to electric expansion valve.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:

Fig. 1 is the two-period form electric expansion valve overall structure cross-sectional view in background technique；

Fig. 2 is the electric expansion valve overall structure cross-sectional view of the first embodiment provided by the invention；

Fig. 3 is the core component overall structure cross-sectional view of Fig. 2 electric expansion valve；

Fig. 4 is the support frame structure stereoscopic schematic diagram of Fig. 2 electric expansion valve；

Fig. 5 is the nut structure stereoscopic schematic diagram of Fig. 2 electric expansion valve；

Fig. 6 is the connecting base structure schematic diagram of Fig. 2 electric expansion valve；

Fig. 7 is the spool overall structure cross-sectional view of electric expansion valve provided by the invention；

Fig. 8 is the electric expansion valve overall structure cross-sectional view with another core component structure provided by the invention；

Fig. 9 is the electric expansion valve overall structure cross-sectional view of second of embodiment provided by the invention；

Figure 10 is the electric expansion valve overall structure diagram of the third embodiment provided by the invention；

Figure 11 is the position between the first circulation passage S1 and the second circulation passage S2 of electric expansion valve provided by the invention Set relation schematic diagram

Specific embodiment

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

It is illustrated in figure 2 the electric expansion valve of the first embodiment provided by the invention, including valve body 10 and valve seat 20, Valve body 10 is formed with valve chamber 102, and valve seat 20 and valve body 10 can be separate structure by being welded and fixed, and the is offered on valve seat 10 One valve port 101, valve seat 20 and valve body 10 or integral structure, the side wall of valve body 10 offer the first connector, this first Connector is welded with the first connecting tubes 100, and the lower end of valve seat 20 offers the second connector, second connector weldering It connects and is fixed with the second connecting tubes 200, the first connecting tubes 100 are connected with the second connecting tubes 200 by the first valve port 101 It is logical, refrigerant can after the entrance of the first connecting tubes 100 by after the first valve port 101 by the second connecting tubes 200 outflow or cold Matchmaker can also be after the entrance of the second connecting tubes 200 by being flowed out after the first valve port 101 by the first connecting tubes 100, the electronics The refrigerant flow direction of expansion valve can be to two-way circulate.

The upper end of valve body 10 is equipped with valve body protrusion 103, and the periphery wall of valve body protrusion 103 is welded with shell 30, which is the tubular structure for closing mouth in upper end, and shell 30 constitutes electronic expansion with valve body 10 together The inner cavity of valve, the inner cavity of the electric expansion valve are roughly divided into upper and lower cavities, and lower cavity forms the valve chamber 102, the upper chambers bodily form At rotor chamber, the peripheral part of shell 30 is arranged with coil component, and rotor assembly 40 is accommodated in the rotor chamber of electric expansion valve, The rotor assembly 40 includes rotor part 41, fixing seat 42, shaft 43 and screw rod 44, and fixing seat 42 is used as independent component not Interfered with rotor part 41, fixing seat 42 is provided with guide hole, and one end of shaft 43 is matched with guide portion, the other end with The screw rod mounting hole of screw rod 44 matches, and whole rotor part 41 is in rough H-type structure, and rotor part 41 is equipped with more than one Rotor protrusion 411, screw rod 44 are equipped with screw rod stage portion 441 and screw rod concave part 442, screw rod concave part 442 and rotor protrusion 411 Match abutting, rotor part 41 and screw rod 44 are integrated injection molding structure, by coil drive portion when electric expansion valve actuation The rotation of the excitation effect driving rotor part 41 of part, because rotor part 41 and screw rod 44 are as an affixed global facility, Screw rod 44 is rotated with rotor part 41, passes through the screw thread of the internal thread part 74a of the external thread part 44a and nut 70 of screw rod 44 Mating reaction drives core component 60 to carry out axial elevating movement in valve chamber 102, the upper end of shaft 43 and fixing seat 42 and The end-enclosed mouth of shell 30 is supported to limit to the movement of screw rod 44 axially upwards.

Electric expansion valve as shown in Figure 4 includes support frame 50, and the whole support frame 50 is substantially in up-small and down-big nut cap Shape structure, including upper support frame 51 and lower bracing frame 52, upper support frame 51 are equipped with the first mounting hole 54 and match confession with screw rod 44 Screw rod 44 passes through, and the end table top of upper support frame 51 and the screw rod stage portion 441 of screw rod 44 are cooperated with the axis to screw rod 44 It is limited to moving down, so that screw rod only can not be carried out elevating movement in the axial direction circumferentially being rotated, lower support Frame 52 opens up at least one mating groove 53 for the cooperation with nut 70, passes through the periphery wall and valve body protrusion of lower bracing frame 52 103 internal perisporium is welded and fixed to which 50 entirety of support frame is fixedly installed in valve body 10, axis of the support frame 50 to screw rod 44 Position-limiting action is played to the circumferential movement of movement and nut 70, reduces the vibration of screw rod 44, prevents the arteries and veins occurred by vibration Punching or flow deviation.It should be noted that the support frame 50 defined here is only in embodiment provided by the present invention Shape description, as long as the circumferential movement for capableing of axial movement and nut 70 to screw rod 44 plays position-limiting action, it should be pointed out that Can also have the other shapes structures such as the variation such as cupule of other shapes, should also cover scope of protection of the present invention it It is interior.

The electric expansion valve provided by the invention in conjunction with shown in Fig. 2-Fig. 3 and Fig. 5-Fig. 7 further includes having core component 60, the core Body component 60 includes attachment base 61, which includes ontology 611 and guide part 612, and ontology 611 is formed with body cavity 6111 And there is ontology end face 611a, and card slot 611b is formed on the 611a of ontology end face, guide part 612 is formed with guiding inner cavity 6121, Nut 70 as shown in Figure 5 includes nut 70, and nut 70 includes nut body 71, connection sheet 72 and at least one auxiliary section 73, connection sheet 72 can be metal material, and nut body 71 can be plastic material, and connection sheet 72 can use and nut body It is metal material by being welded and fixed that 71 integrated injection molding modes, which form and also can choose connection sheet 72 and nut body 71 all, Connection, does not limit the composition material of nut specifically herein, and connection sheet 72 has connection sheet lower end surface 72a, auxiliary section 73 For by the outwardly extending lug boss of nut body 71, auxiliary section 73 with mating groove 53 can engage preventing nut 70 and Core component 60 rotates in a circumferential direction, and the whole press-fitting of nut body 71 is packed into body cavity 6111, and nut 70 and core component 60 are fixed Connection, specifically the ontology end face 611a of the lower end surface 72a Yu attachment base 61 of the connection sheet 72 of nut 70, which are welded and fixed, makes nut 70 entirety are fixedly installed in core component 60, and auxiliary section 73 is also abutted with card slot 611b, and nut 70 is additionally provided with nut installation 74 screw mandrel 44 of hole passes through, and the rotation of rotor 41 is driven under the excitation effect of coil, and screw rod 44 is accompanied rotor 41 and rotated together, Because screw rod 44 remains at the rotation of circumferential direction, rotor 41 is fixedly connected with screw rod 44, rotor 41 also with screw rod 44 as It is maintained at circumferential rotation, therefore rotor 41 can give full play to its magnetic action, passes through the external thread part 44a and nut of screw rod 44 70 internal thread part 74a is threadedly engaged effect and gradates the rotary motion of screw rod 44 for core component 60 in valve chamber 102 Axial elevating movement, nut 70 and core component 60 carry out axial elevating movement in valve chamber 102 together, which is electronics The driving method for expanding valve straight-motion type eliminates complicated slowdown type geared system and bellows configuration, to the power output of coil Demand greatly reduces, and can be realized the miniaturization of coil, even small driving force also can be realized the size to electric expansion valve Flow adjusts purpose.In order to realize more reliable flowing mode of making, one or two settable auxiliary section 73 is opposite with auxiliary section 73 Ground mating groove 53 and card slot 611b is answered to be also configured as one or two, certain auxiliary section 73 may be set to be 3 or more, need What is illustrated be nut 70 with core component 60 is to be fixedly connected, 60 the progress axial direction elevating movements of nut 70 and core component and nothing Method carries out axial rotation motion, and screw rod 44 passes to 70 driving force of nut by screw thread pair, is embodied directly in core component 60 In axial elevating movement, pulse delay is effectively avoided, reduces valve opening pulse deviation, screw rod 44, nut 70 and core component 60 Always in mutual light Pre strained state between three, driving reduces moment impact of the screw rod 44 to screw-driven when starting, The service life of hoisting nut 70；When driving carries out, force part is undertaken by screw thread pair, and reduces the stress abrasion of nut 70 Risk.

Core component 60 further includes spool 63 and valve rod 64, and attachment base 61 is fixedly connected with valve rod 64, and attachment base 61 is equipped with Mounting hole 611c, valve rod 64 are welded and fixed by mounting hole 611c with attachment base 61, and at least partly ontology of spool 63 being capable of edge Guiding inner cavity 6121 moves axially, and spool 63 includes valve core head 631, which can be close to or away from the first valve Mouth 101 flows through the cold medium flux of the first valve port 101 to adjust, and spool 63 and the first valve port 101 constitute big flow together and adjust machine Structure, spool 63 are additionally provided with the second valve port 633, and valve rod 64 can flow through the second valve port close to or away from the second valve port 633 to adjust 633 cold medium flux, valve rod 64 and the second valve port 633 constitute small flow control device, the core group of the electric expansion valve together Part 60 further includes having sleeve 62, and whole sleeve 62 is in cartridge of the lower end with opening portion, and sleeve 62 has opening portion 621, set The lower end of cylinder 62 is formed with the support portion 622 towards inner bending, and support portion 622 is formed with supporting surface 622a, and spool 63 passes through spool The cooperation of lug boss 632 and support portion 622 is hung on to prevent falling off for spool 63 on sleeve 62, and spool lug boss 632 has The spool crowning 632a that cooperation abuts is carried out with supporting surface 622a, sleeve 62 with the stage portion 6122 of guide part 612 by welding It connects and is fixedly installed in attachment base 61, the first spring members 400 are additionally provided between the spool lug boss 632 and stage portion 6122, When refrigerant enters from the second connecting tubes 200 when first spring members 400 are used for closed valve state, prevent from making core component 60 At impact, it is ensured that the abutting for making spool 63 and the first valve port 101 prevents the pressure effect valve core head 631 by refrigerant to be detached from the One valve port 101.

Comfort, electric expansion valve are used to make product further decrease refrigerant flow noise promotion client in use It further include having silencing means 90, ontology 611 offers the first circulation passage S1 for refrigerant circulation, and silencing means 90 includes first Acoustic element 91, first acoustic element 91 cover the first circulation passage S1 to eliminate the vortex of the refrigerant flowed through generation, by air pocket Being broken into minute bubbles reduces coolant noise, and valve rod 64 is formed with valve-rod cavity 641 and the side wall of valve rod 64 offers through hole, this is passed through Through-hole forms the second circulation passage S2 of refrigerant circulation, and valve rod 64 includes head, and for refrigerant circulation is offered in the head Three circulation passage S3, silencing means 90 further include the second acoustic element 92, which is contained in valve-rod cavity 641 and covers Third circulation passage S3, silencing means 90 further include having third acoustic element 93 and the 4th acoustic element 94, and third acoustic element 93 holds It is contained in the spool chamber 635 of spool 63, the 4th acoustic element 94 is set to the peripheral part of valve rod 64 and covers the second circulation passage S2, respectively disappears The material of sound part can be mesh or blocky acoustic element is also possible to its superposition, not appoint herein to the specific material of acoustic element What, which is limited, only need to can be realized silencing function, briefly describe noise reduction actuation principle, spool by taking closed valve state as an example below When 63 valve core head 631 and the first valve port 101 contact and the head of valve rod 64 and the second valve port 633 contact, electronics Expansion valve forms fixed small flow adjustment state i.e. refrigerant and flows through the small stream of fixation that third circulation passage S3 constitutes electric expansion valve Regulating mechanism is measured, refrigerant is eliminated refrigerant by the first acoustic element 91 by valve chamber 102 after the entrance of the first connecting tubes 100 and generated Vortex and enter first-class circulation passage S1 after gradually smashing air pocket, pass through after 94 noise reduction flow-disturbing of the 4th acoustic element Second circulation passage S2 enters valve-rod cavity 641 by 92 noise reduction flow-disturbing of the second acoustic element, then by third circulation passage S3 through second Valve port 633 enters spool chamber 635, and connects after 93 noise reduction flow-disturbing of third acoustic element finally by the first valve port 101 outflow second Adapter tube 200, refrigerant substantially reduce refrigerant flow noise by the flow-disturbing of the noise reduction layer by layer effect of silencing means, further improve Client uses the comfort of product, as shown in figure 11 can be by the it should be noted that in order to realize be more good erasure effect One circulation passage S1 and the second circulation passage S2 are staggered, by the center line of the first circulation passage S1 and the second The center line of circulation passage S2 is vertically arranged, and two the first circulation passage S1 and two the second circulation passages can be respectively set A first circulation passage S1 and two the second circulation passage S2 is only arranged in S2, by first after refrigerant enters valve chamber 102 The stroke of circulation passage S1 to the second circulation passage S2 are elongated to keep refrigerant elongated by the distance of effective noise reduction area, further mentions Noise reduction flow-disturbing effect is risen, the fit clearance between each components has medium entrance in order to prevent, which is additionally provided with Sealing performance between each components of the sealing element 80 to promote electric expansion valve, the sealing element 80 include first seal 81, The first seal 81 is set between the peripheral part of the 4th acoustic element 94 and the internal perisporium of guide part 612, further includes having second Sealing element 82, second seal 82 is in the concave part 634 of spool 63.

Below under plain statement the embodiment electric expansion valve actuation principle, by coil magneticaction driving rotor 41 Rotation, screw rod 44 by shaft 43 and fixing seat 42 upper end and shell 30 support and the position-limiting action of support frame 50 only It is circumferentially rotated, is acted on by the screw-driven of the internal thread part 74a of the external thread part 44a and nut 70 of screw rod 44, screw rod Nut 70 and core component 60 is driven to carry out axial elevating movement in valve chamber 102 together, in valve opening state, spool protrusion Portion 632 is supported on the supporting surface 622a of sleeve 62 and abuts against with it, when from valve opening gradually to during valve closing, 70 He of nut Core component 60 is moved downward by screw thread transmitting actuation, and the auxiliary section 73 of nut 70 is only carried out by the position-limiting action of support frame 50 Axial elevating movement, auxiliary section 73 are also moved downward along mating groove 53, and the valve core head 631 of spool 63 moves closer to the first valve port 101, this process is big flow adjustment state, is acted on silk by screw-driven after valve core head 631 is abutted with the cooperation of the first valve port 101 Bar 44 drives nut 70 and core component 60 to continue to move downward, and spool crowning 632a and supporting surface 622a are with original Abutting state gradually falls off, and valve rod 64 moves closer to the second valve port 633, this process is small flow adjustment state, until spool is convex It rises when being disengaged to maximum distance between face 632a and supporting surface 622a, valve rod 64 is contacted with the second valve port 633, realization valve closing Process；And in closed valve state, the supporting surface 622a of spool lug boss 632 and sleeve 62 is disengaged position, when needing from valve closing When to valve opening, apply the rotation of reversed excitation pulse driving rotor 41, the retinue's rotation of screw rod 44, by the spiral shell of screw rod 44 and nut 70 Line transmission actuation nut 70 and 60 entirety of core component move upwards, and auxiliary section 73 is also moved up along mating groove 53, sleeve 62 Supporting surface 622a move closer to spool crowning 632a, valve rod 64, which is gradually opened the second valve port 633 and constitutes small flow, adjusts shape State, spool 63 is continued to keep valve core head 631 and the first valve port by the spring-force driven dual of the first spring members 400 in the process Cooperation between 101 abuts, when supporting surface 622a is abutted with spool crowning 632a cooperation, 64 the second valve port of distance of valve rod 633 is farthest, is acted on nut 70 by the screw-driven of screw rod 44 and nut 70 and core component 60 continues up, by sleeve 62 Lifting makes valve core head 631 be gradually distance from the first valve port 101 to band movable valve plug 63 upwards, and the first valve port opens composition big flow and adjusts shape State.

Attachment base 61 is fixedly connected with valve rod 64 above by the optimization design to 60 structure of core component, is needing valve opening It carries out in small flow adjustment process, the axial-rotation of screw rod 44 can be transported by the screw thread transmitting effect of screw rod 44 and nut 70 Turn turn to drive core component 60 integrally carried out in valve chamber 102 it is moved axially upward, screw-driven effect under make attachment base 61 band ovable valve stems 64 are gradually distance from the second valve port 633 to form small flow adjustment state, other are carrying out small-large flow adjusting It is also the same when demand, the either cooperation of the spool 63 of electric expansion valve and the first valve port 101 or valve rod 64 and the second valve port Effect, i.e. the driving side of the Direct Action Type of electric expansion valve are threadedly engaged by nut 70 and screw rod 44 in 633 engagement process Formula achieves that the small-large flow adjusting to refrigerant, and it is whole to eliminate complicated The gear deceleration formula device and bellows structure, product Body structure is more simple, low to the output force request of coil component, can be realized the Miniaturization Design of coil, even small driving Power also can smoothly realize open and close valve.

As shown in Figure 8 is another structural schematic diagram of the core component of electric expansion valve provided by the invention, when cold The core component 60 can cancel sleeve 62 and first when matchmaker only needs the inside for unidirectionally entering valve body 10 from the first connecting tubes 100 Spring members 400, core component 60 include attachment base 61, and attachment base 61 is structure as a whole, which includes 611 He of ontology The lower end of guide part 612', guide part 612' have guide openings portion 621a', spool 63 at least partially by guide openings Portion 621a' protrudes into valve chamber 102, and the lower end of guide part 612' also has the guide support portion 612b' inwardly bent, guiding Support portion 612b' is formed with guide support face 6121b', the spool lug boss 632 of spool 63 by with the guide support face 6121b' is hung on attachment base 61, and at least part of spool 63 can be moved axially along guiding inner cavity 6121', is oriented to Portion 612' also has inner wall 612c', and when valve rod 64 is close to or away from the second valve port 633, inner wall 612c' can be connected to each other Close or remote from spool lug boss 632, specifically acted on after valve core head 631 is abutted with the first valve port 101 by excitation, attachment base 61 Continue movement down together with valve rod 64 and progressively close off the second valve port 633, in the process, guide support face 6121b' is gradually distance from Spool crowning 632a, and inner wall 612c' moves closer to spool lug boss 632；Otherwise when being acted on by opposite excitation, valve rod 64 are gradually distance from the second valve port 633, and attachment base 61 is moved upwards together with valve rod 64 makes inner wall 612c' be gradually distance from spool protrusion Portion 632, and guide support face 6121b' moves closer to spool crowning 632a until band movable valve plug 63 opens the first valve after abutting Mouth 101.It should be noted that the guide support face 6121b' and spool of the guide part 612' of electric expansion valve provided by the invention The distance between the supporting surface 622a of the distance between 63 spool crowning 632a or sleeve 62 and spool crowning 632a The small flow control device stroke of valve rod 64 and the second valve port 633 is constituted, the structure and actuation principle of other associated components exist Above-mentioned electric expansion valve makees specific statement, and this is no longer going to repeat them.

As shown in Figure 9 is the electronic expansion valve structure schematic diagram of second of embodiment provided by the invention, the electronics Expansion valve and the electric expansion valve of first embodiment comparison difference essentially consist in rotor component construction and core component knot Structure, the electric expansion valve include rotor assembly 40', and rotor assembly 40' includes rotor 41', the fixation that is fixedly connected with rotor 41' Seat 42' and screw rod 44', rotor 41' and fixing seat 42' integrated injection molding, screw rod 44' pass through fixing seat 42' and rotor 41' It is fixedly connected indirectly, fixing seat 42' has guide portion and offers fixed bore, the upper end of screw rod 44' and the fixation bore It matches and the end-enclosed mouth of the upper end of screw rod 44' and shell 30 is supported to limit the fortune axially upwards of screw rod 44' Dynamic, the end table top of screw rod stage portion 441' and upper support frame 51, which abuts against, to be cooperated to limit the axial downward movement of screw rod 44', So that screw rod 44' remains at circumferential rotation, core component 60 includes attachment base 61 and spool 63, and attachment base 61 includes Ontology 611 and guide part 612, ontology 611 have body cavity 6111, and the press-fitting of nut 70 is packed into body cavity 6111, ontology 611 Side wall is equipped with the first circulation passage S1 and ontology 611 has third valve port 611d, and valve rod 64' press-fitting is packed into guiding inner cavity 6121, Valve rod 64' has head and valve-rod cavity 641', and head is formed with third circulation passage S3, and the peripheral part of the first circulation passage S1 covers Be stamped the first acoustic element 91, valve-rod cavity 641' accommodates the second acoustic element 92 and the second acoustic element 92 be located at the second valve port 633' and Between third valve port 611d, the second acoustic element 92 covers third circulation passage S3, remaining structure feature and makees flowing mode the One embodiment is described in detail, and this is no longer going to repeat them.

As shown in Figure 9 and Figure 10 for second of embodiment provided by the invention electronic expansion valve structure schematic diagram and Connecting base structure schematic diagram, the rotor assembly 40' of the electric expansion valve includes rotor 41', the fixation that is fixedly connected with rotor 41' Seat 42' and screw rod 44', rotor 41' and fixing seat 42' integrated injection molding, fixing seat 42' have guide portion and offer solid Reservation hole, fixing seat 42' are fixedly connected with connecting rod 421, which includes horizontal part and longitudinal direction portion, horizontal part and guide portion It is welded and fixed, longitudinal portion axially protrudes into rotor chamber, nut 70' and connection sheet 71' integrated injection molding and spiral shell by fixing seat hole Female 70' is fixedly mounted by connection sheet 71' and valve body 10, and the peripheral part of nut 70 is arranged with spring guide rail 500, the spring guide rail 500 include slip ring 501, and slip ring 501 is moved by steel wire wound into that can spin along spring guide rail 500, connecting rod 421 and slip ring 501 are cooperated, and for the stop up and down for controlling 501 screw of slip ring, the upper end of spring guide rail 500 is provided with stop Portion, when slip ring 501 moves upwards supreme stop point, upper retainer will limit the continuation of slip ring 501 and up move, spring guide rail 500 Lower end be provided with lower retainer, when slip ring 501 move to lower stop point at present retainer will limit slip ring 501 continue down Movement, the spring guide rail 500, slip ring 501 and connecting rod 421 constitute the stop mechanism of electric expansion valve, by connecting rod 421 with The mating reaction of slip ring 501 is to control the movement travel of the axial direction of screw rod 44 to drive core component 60' in valve chamber 102 Axial elevating movement, the nut installation that there is screw rod 44' external thread part 44a' and screw rod 44' substantially integrally to protrude into nut 70' Hole 74', nut 70' are equipped with internal thread part 74a', will by the actuation that is threadedly engaged of external thread part 44a' and internal thread part 74a' Screw rod 44' is converted into core component 60' in the axial elevating movement of valve chamber 102, screw rod by the rotor 41' rotary motion driven The lower end of 44' is fixedly connected with screw rod bushing 700, and screw rod bushing 700 has the first thrust face 701, and the upper end of attachment base 61' is solid Surely being connected with valve needle cover 600, valve needle cover 600 and screw rod bushing 700 has the second thrust face in structure, valve needle cover 600 is arranged oppositely 601, the first thrust face 701 and the second thrust face 601 are arranged oppositely, and the first thrust face 701 can be detached from the second thrust face 601 Or abut, i.e., screw rod bushing 700, which can be relatively distant from valve needle cover 600 or screw rod bushing 700, can be relatively close to valve needle cover 600 or screw rod Set 700 can be abutted against with valve needle cover 600, by excitation Operating valve rod 64' after valve core head 631 and the first valve port 101 abut against When starting to close the second valve port 633' downwards, the beginning of the first thrust face 701 is detached from the second thrust face 601, as valve rod 64' When abutting with the second valve port 633', the first thrust face 701 is detached from the second thrust face 601, i.e., screw rod bushing 700 is relatively distant from valve Needle guard 600, when valve rod 64', which is moved upwards, opens the second valve port 633', the first thrust face 701 starts close to the second thrust face 601, when valve rod 64' is not abutted with the second valve port 633', the first thrust face 701 moves closer to the second thrust face 601 or the first Thrust face 701 is abutted against with the second thrust face 601, i.e. the relatively close valve needle cover 600 of screw rod bushing 700 or screw rod bushing 700 and needle Set 600 abuts against, it should be noted that when valve rod 64' the second valve port of distance 633' is farthest screw rod bushing 700 and valve needle cover be to Connect state.Core component 60' includes attachment base 61' and spool 63, and attachment base 61' includes ontology 611' and guide part 612, ontology 611' have body cavity 6111', and body cavity 6111' is equipped with second spring component 800, in core component 60', this Body 611' offers the first communicating passage S1' and third valve port 611d, one end of second spring component 800 are connected to third valve Mouth 611d, the other end abut screw rod bushing 700.Valve rod 64' press-fitting is packed into the guiding inner cavity 6121 of guide part 612, and guide part 612 has There is stage portion 6122, sleeve 62 is installed on attachment base 61' by being welded and fixed with the stage portion 6122, stage portion 6122 and spool It is provided with the first spring members 400 between lug boss 632, further includes having silencing means to further decrease refrigerant flow noise 90, silencing means 90 includes the first acoustic element 91, for covering the first circulation passage S1, the second acoustic element 92, second noise reduction Part 92 is contained in valve-rod cavity 641' and between the second valve port 633 and third valve port 611d, and is contained in spool chamber 635 Third acoustic element 93, third acoustic element 93 are fixedly installed in spool chamber 635 by block piece 300.In order to prevent each components it Between fit clearance have medium entrance, which is additionally provided with sealing element 80 to promote each components of electric expansion valve Between sealing performance, which includes second seal 82, and second seal 82 is set to spool 63, specifically, valve Core 63 is equipped with concave part 634, and second seal 82 is flush-mounted in the concave part 634.

Simple example states the embodiment electric expansion valve by the actuation principle of valve closing to valve opening below, valve core head when valve closing 631 contact with the first valve port 101, and valve rod 64 is contacted with the second valve port 633, by coil magnetization act on rotor 41' into Row rotation, fixing seat 42' retinue rotate and drive the rotation of screw rod 44', and connecting rod 421 drives slip ring 501 along 500 axis of spring guide rail To upward actuation, being acted on by the screw-driven of screw rod 44' and nut 70' by the translating rotation of screw rod 44' is core component 60' Actuation axially upwards, by own resilient return action the first thrust face 701 of second spring component 800 and the second thrust face 601 are abutted, and drive attachment base 61' and sleeve 62' integrally moved axially upward by screw rod 44', the supporting surface of sleeve 62' 622a' moves closer to spool crowning 632a, and valve rod 64' is gradually distance from the second valve port 633', and the second valve port 633', which is opened, to be realized The small flow of refrigerant is adjusted, and is acted on screw rod by screw-driven after the supporting surface 622a' of sleeve 62' is abutted with spool crowning 632a 44' drives core component 60' integrally to continue up, by attachment base 61' and sleeve 62' band movable valve plug 63 towards far from the first valve The direction actuation of mouth 101, the first valve port 101, which is opened, realizes that the big flow of refrigerant is adjusted, and screw rod 44' is made by the excitation of coil component It is rotated with retinue rotor part 41' and fixing seat 42', by the external thread part 44a' and nut 70' of screw rod 44' The rotary motion of screw rod 44' is converted transporting along axial lifting for core component 60' by the screw-driven effect of threaded portion 74a' It is dynamic, further through the mating reaction between valve needle cover 700 and screw rod bushing 600 be further driven to core component 60' in valve chamber 102 into Row axial direction elevating movement, the program eliminate complicated gear type deceleration device and bellows structure, and product overall structure is more Simply, it can be realized pair by the driving method that the screw-driven effect of screw rod 44' and nut 70' are electronic expansion valve straight-motion type The purpose that electric expansion valve small-large flow is adjusted.

Simple statement is carried out to related embodiment of the invention above, it should be noted that implementation set forth above Example is the preferred embodiment of electronic expansion valve structure provided by the invention, is not intended to restrict the invention, the core stated The structure of component can be replaced mutually in various embodiments, such as the first embodiment provided by the invention The core component structure of electric expansion valve is fully applicable in the electronic expansion valve structure of second embodiment.

The upper and lower, left and right that occur in this specification text, in, the nouns of locality and first, second, third, fourth such as interior Etc. ordinal numbers be to be illustrated on the basis of the state that corresponding Figure of description is presented, introduce and do not answer to introduce convenient When being interpreted as the limitation sequentially to related components of the invention.

Electronic expansion valve structure design provided by the invention passes to rotor portions by the excitation effect of coil drive component The rotation of screw rod is converted into the axial elevating movement of core component, taken by part, the screw-driven actuation through screw rod and nut Disappeared slowdown type geared system and bellows structure, and electric expansion valve product overall structure is relatively simple, to the defeated of coil component Power output demand greatly reduces while improving the reliability of product actuation, also can be realized under the control condition of smaller driving force The big flow of electric expansion valve and small flow regulating function, and the arrangement of silencing means layer by layer is carried out in core component, when cold Matchmaker, which enters after valve chamber, carries out noise reduction flow-disturbing to it, and air pocket is gradually smashed and becomes lesser bubble and lower refrigerant flow noise to reach Preferable noise reduction effect promotes client using the comfort in product process.

The present invention is in addition to related embodiment set forth above, and to those skilled in the art, the present invention can be with There are various modifications and variations, as long as within spiritual principles of the invention, any modification, equivalent replacement, improvement and so on, It should be included within protection scope of the present invention.

Claims

1. a kind of electric expansion valve characterized by comprising

Valve body (10) and valve seat (20), the valve body (10) have valve chamber (102), and the valve seat (20) is equipped with the first valve port (101)；

Rotor assembly (40), the rotor assembly (40) include rotor (41) and screw rod (44), the rotor (41) and the silk Bar (44) is fixedly connected, and the screw rod (44) has external thread part (44a)；

Support frame (50), support frame as described above (50) are fixedly connected with the valve body (10), and support frame as described above (50) includes mating groove (53) and the first mounting hole (54)；

Nut (70), the nut (70) include auxiliary section (73) and the interior spiral shell that is threadedly engaged with the external thread part (44a) Line portion (74a), the auxiliary section (73) can carry out axial elevating movement along the mating groove (53)；

Core component (60), the core component (60) are fixedly connected with the nut (70), pass through the external thread part (44a) With the effect that is threadedly engaged of the internal thread part (74a), the core component (60) at least partially in the valve chamber (102) into Row axial direction elevating movement, the core component (60) includes attachment base (61) and spool (63), the attachment base (61) and valve rod (64) it is fixedly connected, the spool (63) has valve core head (631), and the valve core head (631) can be close to or away from described the One valve port (101), the spool (63) are additionally provided with the second valve port (633), and the valve rod (64) can be close to or away from described Two valve ports (633).

2. electric expansion valve according to claim 1, which is characterized in that the attachment base (61) include ontology (611) and Guide part (612/612'), the ontology (611) have body cavity (6111), and the guide part (612/612') has in guiding At least part of chamber (6121/6121'), the spool (63) carries out axial shifting in the guiding inner cavity (6121/6121') It is dynamic.

3. electric expansion valve according to claim 2, which is characterized in that the core component (60) further includes sleeve (62), the sleeve (62) is fixedly connected with the attachment base (61), and the spool (63) has spool lug boss (632), institute Sleeve (62) are stated with opening portion (621) and support portion (622), at least part of the spool (63) passes through the opening Portion (621) protrudes into the valve chamber (102), and the support portion (622) has supporting surface (622a), and the supporting surface (622a) can It abuts or is detached from the spool lug boss (632).

4. electric expansion valve according to claim 3, which is characterized in that the guide part (612) has stage portion (6122), the sleeve (62) is fixedly connected with the stage portion (6122), the stage portion (6122) and spool protrusion The first spring members (400) are equipped between portion (632).

5. electric expansion valve according to claim 2, which is characterized in that the guide part (612 ') has guide openings portion At least part of (612a') and guide support portion (612b'), the spool (63) pass through the guide openings portion (612a') is protruded into the valve chamber (102), and the guide support portion (612b') has guide support face (6121b'), the guiding Supporting surface (6121b') can be abutted or be detached from the spool lug boss (632), and the guide part (612') further includes inner wall Face (612c'), the inner wall (612c') can be close to or away from the spool lug bosses (632).

6. the electric expansion valve according to claim 3 or 5, which is characterized in that the ontology (611) is equipped with mounting hole (611c) and the first circulation passage S1, the valve rod (64) connect by the way that the mounting hole (611c) and the ontology (611) is fixed It connects, the valve rod (64) has valve-rod cavity (641).

7. electric expansion valve according to claim 6, which is characterized in that the side wall of the valve rod (64) is equipped with through hole, The through hole forms the second circulation passage S2, and the head of the valve rod (64) is equipped with third circulation passage S3, and the electronics is swollen Swollen valve further includes silencing means (90), and the peripheral part of the first circulation passage S1 is covered with the first acoustic element (91), the valve Rod cavity (641) accommodates the second acoustic element (92) and the acoustic element (92) covers the third circulation passage S3, the spool (63) spool chamber (635) accommodates third acoustic element (93), and the third acoustic element (93) is fixedly mounted by block piece (300) In the spool chamber (635), the peripheral part of the second circulation passage S2 is covered with the 4th acoustic element (94), first circulation The central axis of channel S1 is in the center line of the second circulation passage S2.

8. electric expansion valve according to claim 7, which is characterized in that the electric expansion valve further includes sealing element (80), the sealing element (80) includes first seal (81) and second seal (82), and the first seal (81) is set to Between the peripheral part of 4th acoustic element (94) and the internal perisporium of the guide part (612), the second seal (82) is embedding Concave part (634) loaded on the spool (63).

9. the electric expansion valve according to claim 3 or 5, which is characterized in that the ontology (611) be equipped with it is first-class all Road S1 and third valve port (611d), valve rod (64') press-fitting are packed into the guiding inner cavity (6121/6121'), the valve rod (64') has valve-rod cavity (641'), and the head of the valve rod (64') forms third circulation passage S3.

10. electric expansion valve according to claim 9, which is characterized in that the electronic expansion further includes silencing means (90), the peripheral part of the first circulation passage S1 is covered with the first acoustic element (91), and the valve-rod cavity (641') accommodates Two acoustic elements (92), the acoustic element (92) covers the third circulation passage S3 and the acoustic element (92) is located at described second Between valve port (633) and the third valve port (611d), the spool chamber (635) of the spool (63) accommodates third acoustic element (93)。

11. a kind of electric expansion valve, which is characterized in that including

Rotor assembly (40'), the rotor assembly (40') include rotor (41') and screw rod (44'), the rotor (41') and institute It states screw rod (44') to be fixedly connected, the screw rod (44') has external thread part (44a')；Nut (70'), the nut (70') with The valve body (10) is fixedly connected, and the nut (70') has the internal thread part matched with the external thread part (44a') (74a')。

Stop mechanism, the stop mechanism include connecting rod (421), are sheathed on the spring guide rail (500) of the periphery the nut (70') And slip ring (501), the connecting rod (421) and the slip ring (501) are contacted to control the axial movement row of screw rod (44) Journey；

Core component (60'), the core component (60') include attachment base (61') and spool (63), the attachment base (61') is fixedly connected with valve rod (64'), and the spool (63) has valve core head (631), and the valve core head (631) can approach Or far from first valve port (101), the spool (63) is additionally provided with the second valve port (633), and the valve rod (64') can approach Or far from second valve port (633), the upper end of the attachment base (61') is fixedly connected with valve needle cover (600), the screw rod The lower end of (44') is fixedly connected with screw rod bushing (700), and the valve needle cover (600) sets with the screw rod bushing (700) in opposite direction It sets, when the valve rod (64') is abutted with second valve port (633), the screw rod bushing (700) is relatively distant from the valve needle cover (600)；When the valve rod (64') is not abutted with second valve port (633), the screw rod bushing (700) is relatively close to described Second valve port (633) is abutted with second valve port (633).