CN103672131B

CN103672131B - Electronic expansion valve

Info

Publication number: CN103672131B
Application number: CN201210327242.2A
Authority: CN
Inventors: 韩荣耀; 吕晓
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2012-09-06
Filing date: 2012-09-06
Publication date: 2016-06-08
Anticipated expiration: 2032-09-06
Also published as: CN103672131A

Abstract

The invention relates to an electronic expansion valve, comprising: a valve assembly including a movable valve member; an actuator including a spindle, an abutment, and an anti-rotation lock, the spindle being threadedly engaged with the anti-rotation lock, the movable valve member being disposed at the anti-rotation lock, the abutment receiving the anti-rotation lock such that the anti-rotation lock together with the movable valve member is axially movable but not rotationally movable relative to the abutment when the spindle is rotated; and a drive mechanism for powering the actuator. The electronic expansion valve also comprises a stop mechanism. The stop mechanism comprises a first stop piece and a second stop piece, the first stop piece can rotate integrally with the mandrel, and the second stop piece can translate along the axial direction along with the rotation of the mandrel, so that the first stop piece and the second stop piece can be abutted to each other to limit the rotation range of the mandrel. According to the invention, the vertical translation of the valve needle is realized, and meanwhile, the rotation stop of the rotor and the mandrel is realized to avoid the seizure and the locking of the thread pair caused by the over-rotation of the thread pair.

Description

Electric expansion valve

Technical field

The present invention relates to a kind of electric expansion valve.

Background technology

Electric expansion valve is the important parts in cooling/heating system, is mainly used in the flow to refrigerant fluid and regulates. Traditional electric expansion valve generally adopts stepper-motor to control, and is usually made up of driving mechanism (stepper-motor), topworks (thread screw mechanism), throttle mechanism (needle valve seat) and relevant auxiliary mechanism.

But, on the one hand, in traditional electric expansion valve, needle moves up and down along the axial direction due of electric expansion valve in the case of rotation, and this can cause needle to produce transverse shakiness in the process moved up and down, and then can cause the bad joint of needle and valve seat. And, needle moves up and down the end (lower end) that also can cause needle in the case of rotation and produces to wear and tear because of relative rotation therebetween with valve seat.

On the other hand, in traditional electric expansion valve, such as, in the standard-sized sheet and closed positions of valve, the screw thread pair that can produce to cause because of rotor over-rotation kills problem, thus is difficult to ensure the smooth transmission of screw thread pair.

Here, it should be noted that the technology contents provided in this part is intended to contribute to those skilled in the art's the understanding of the present invention, and not necessarily forms prior art.

Summary of the invention

This part provides total summary of the present invention, instead of the comprehensive disclosure of the complete scope of the present invention or all features of the present invention.

An object of one or more enforcement modes of the present invention be to provide a kind of guarantee the good bond of needle with valve seat and avoid needle and valve seat produce because of relative rotation therebetween abrasion electric expansion valve.

Another object of one or more enforcement modes of the present invention is to provide a kind of avoids the screw thread pair caused because of rotor and axle over-rotation to kill the electric expansion valve with wear problem.

An object again of one or more enforcement modes of the present invention is to provide and a kind of can realize the electric expansion valve automatically closing the function of electric expansion valve when power-off.

A further object of one or more enforcement modes of the present invention is to provide a kind of rotation stop bit realizing rotor and axle while realizing needle upper and lower translation and causes screw thread pair to be engaged stuck electric expansion valve to avoid because of screw thread pair over-rotation.

One or more in order to what realize in above-mentioned purpose, according to the present invention, it is provided that a kind of electric expansion valve, comprising: valve assembly, described valve assembly comprise movable valve member and for the flow of the fluid flowing through described electric expansion valve is regulated; Topworks, described topworks comprise axle, strut member and anti-rotation lock part and for driving described movable valve member to carry out axial motion, one end of described axle and described anti-rotation lock part is threadedly engaged, described movable valve member is arranged at the other end of described anti-rotation lock part, described strut member receives described anti-rotation lock part at least partially so that when described axle rotates, but described anti-rotation lock part can carry out axial motion relative to described strut member together with described movable valve member can not be rotated; And driving mechanism, described driving mechanism is used for as described topworks provides power. Described electric expansion valve also comprises stop mechanism. Described stop mechanism comprises the first stop bit part and the 2nd stop bit part, described first stop bit part can rotate integratedly with described axle, described 2nd stop bit part can translate vertically along with the rotation of described axle so that described first stop bit part and described 2nd stop bit part can mutually to connecing to limit the scope of the rotation of described axle.

One or more enforcement modes according to the present invention, owing to adopting anti-rotational design, avoid needle and produce transverse shakiness in the process moved up and down, and then guarantee the good bond of needle and valve seat, and the end (lower end) that it also avoid needle produces to wear and tear because of relative rotation therebetween with valve seat.

One or more enforcement modes according to the present invention, owing to being provided with stop mechanism, avoid the screw thread pair caused because of rotor and axle over-rotation and kill and wear problem, thus ensure the smooth transmission of screw thread pair.

One or more enforcement modes according to the present invention, owing to being provided with electromagnetism maintaining body, therefore, it is possible to realize the function automatically closing electric expansion valve when power-off.

Especially, according to one or more enforcement modes of the present invention, while realizing needle upper and lower translation, it is achieved the rotation stop bit of rotor and axle causes screw thread pair occlusion stuck to avoid because of screw thread pair over-rotation.

Accompanying drawing explanation

By the description referring to accompanying drawing, one or several feature and advantage implementing mode of the present invention will become easier to understand, in the accompanying drawings:

Fig. 1 is the longitudinal sectional view of the electric expansion valve being in standard-sized sheet state according to first embodiment of the invention;

Fig. 2 is the longitudinal sectional view of the electric expansion valve being in full off state according to first embodiment of the invention;

Fig. 3 is the assembled state stereographic map of the major parts (comprising stop mechanism, axle, lower support element, anti-rotation lock part, needle) of the electric expansion valve according to first embodiment of the invention;

Fig. 4 is the assembled state longitudinal sectional view of the major parts (comprising stop mechanism, axle, lower support element, anti-rotation lock part, needle) of the electric expansion valve according to first embodiment of the invention;

Fig. 5 is the stereographic map of the anti-rotation lock part according to first embodiment of the invention;

Fig. 6 is the stereographic map of the spring spiral guide rail according to first embodiment of the invention;

Fig. 7 is the stereographic map of the slip ring according to first embodiment of the invention;

Fig. 8 is the stereographic map of the modification illustrating the stop mechanism according to first embodiment of the invention;

Fig. 9 is the assembled state stereographic map of the major parts (comprising stop mechanism, axle, lower support element, anti-rotation lock part, needle) of the electric expansion valve according to second embodiment of the invention;

Figure 10 is the assembled state longitudinal sectional view of the major parts (comprising stop mechanism, axle, lower support element, anti-rotation lock part, needle) of the electric expansion valve according to second embodiment of the invention;

Figure 11 is the stereographic map with the axle rotating bit-stopping structure according to second embodiment of the invention;

Figure 12 is the stereographic map of the lower support element with guiding structure according to second embodiment of the invention; And

Figure 13 is the stereographic map with the anti-rotation lock part rotating bit-stopping structure according to second embodiment of the invention.

Embodiment

With reference to the accompanying drawings, describe the present invention by illustrative embodiments. It is only for demonstration object to the following detailed description of the present invention, and it is never to the restriction of the present invention and application or purposes.

First, the structure of the electric expansion valve according to first embodiment of the invention is described with reference to Fig. 1 to Fig. 7. wherein, Fig. 1 is the longitudinal sectional view of the electric expansion valve being in standard-sized sheet state according to first embodiment of the invention, Fig. 2 is the longitudinal sectional view of the electric expansion valve being in full off state according to first embodiment of the invention, the major parts that Fig. 3 is the electric expansion valve according to first embodiment of the invention (comprises stop mechanism, axle, lower support element, anti-rotation lock part, needle) assembled state stereographic map, the major parts that Fig. 4 is the electric expansion valve according to first embodiment of the invention (comprises stop mechanism, axle, lower support element, anti-rotation lock part, needle) assembled state longitudinal sectional view, Fig. 5 is the stereographic map of the anti-rotation lock part according to first embodiment of the invention, Fig. 6 is the stereographic map of the spring spiral guide rail according to first embodiment of the invention, and Fig. 7 is the stereographic map of the slip ring according to first embodiment of the invention.

Electric expansion valve 1 according to first embodiment of the invention can comprise: for the valve assembly 10 regulated by the flow of the fluid flowing through electric expansion valve 1; For driving the movable valve member (i.e. needle) of valve assembly 10 to carry out the topworks 50 of axial motion; For topworks 50 provides the driving mechanism 40 of power; And for keeping and discharge the electromagnetism maintaining body 60 of topworks 50.

In preferred example, valve assembly 10 comprises valve body 12. Valve body 12 arranges the entrance 12-1 being connected with the inflow pipe 92 and outlet 12-2 being connected with outflow tube 94. Fluid flows into electric expansion valve 1 via inflow pipe 92, then flows out electric expansion valve 1 via outflow tube 94.

In preferred example, standing valve component (i.e. valve seat) 18 is set at the outlet 12-2 place of valve body 12.

In preferred example, as mentioned above, the valve assembly 10 of electric expansion valve 1 also comprises needle 14. And, as mentioned above, needle 14 carries out axial motion under the drive of topworks 50 such that it is able to opens and closes valve seat 18 and can regulate the valve opening of electric expansion valve 1. Needle 14 can comprise first end (upper end) 14-1 and the 2nd end (lower end) 14-2. First end 14-1 is used for and is hereafter engaged by the 2nd section (needle junction surface) 55-2 of the anti-rotation lock part 55 being described in detail. 2nd end 14-2 is used for engaging with valve seat 18 thus closes valve seat 18.

In preferred example, needle 14 also comprises against the wear ring 14-5 of the end face of valve seat 18, thus can providing between needle 14 and valve seat 18 and better seal effect of the 2nd end 14-2 setting around needle 14.

In some instances, it is possible in the valve chamber 12-5 of valve body 12, setting example is such as the impurity to filter in the fluid flowing through electric expansion valve 1 in the filtering net (not shown) of general cylindrical shape.

In some instances, it is possible to the sealing engagement of seal washer 32 to realize between valve seat 18 and valve body 12 is set between valve seat 18 and valve body 12.

In the example shown in the series of figures, driving mechanism 40 can be the motor 40 comprising stator 41 and rotor 42. Rotor 42 can rotate in stator 41. In addition, it is possible to sleeve 44 is set between stator 41 and rotor 42 to realize the object of easy to assembly and easy sealing.

In preferred example, rotor 42 is embodied as the round barrel-shaped magnet ring of one end open, thus limits rotor chamber 42-1. Hereafter the stop mechanism 57 being described in detail is arranged in rotor chamber 42-1 at least in part.

In addition, in preferred example, rotor 42 is injection molded into one with the axle 51 of topworks 50, so that rotor 42 and axle 51 rotate integratedly when driving mechanism (motor) 40 is energized. However, it will be understood by those skilled in the art that rotor 42 and axle 51 can also be individually formed, and then it is permanently connected together by suitable mode.

In preferred example, topworks 50 comprises: axle 51 as mentioned above; Lower support element (strut member as according to the present invention) 53; And anti-rotation lock part 55.

In some instances, axle 51 can comprise first end (upper end) 51-1 and the 2nd end (lower end) 51-2. First end 51-1 is used for and is hereafter engaged by the dynamic iron 64 of the electromagnetism maintaining body 60 being described in detail. 2nd end 51-2 can be formed with outside screw. 2nd end (male end) 51-2 is used for and is hereafter threadedly engaged by the first section (internal thread part) 55-1 of the anti-rotation lock part 55 being described in detail, thus forcing anti-rotation lock part 55 to carry out axial motion together with needle 14 when axle 51 is axially fixing and anti-rotation lock part 55 circumference is fixing by the rotation of axle 51, this respect will hereafter be described further.

In the example shown in the series of figures, it is possible to be specially place above the vicinity of the 2nd end 51-2 of axle 51 at the lower section place of axle 51 and collar 51-4 is set. Collar 51-4 is used for and the first section (sliding supporting part) the 53-1 slip joint of lower support element 53 being hereafter described in detail, thus guides the rotary motion relative to lower support element 53 and the axial motion of axle 51.

In preferred example, lower support element 53 comprises: the first section (sliding supporting part) 53-1 as mentioned above; And the 2nd section (anti-rotation portion) 53-2. Can forming through hole in the first section 53-1, this through hole can have round-shaped. Thus, the first section 53-1 slidably holds the collar 51-4 of axle 51 by its circular through hole, thus guides rotary motion and the axial motion of axle 51, so that the rotary motion of axle 51 and axial motion are more steady. 2nd section 53-2 can be formed non-circle or Polygons through hole, the first section 55-1 of anti-rotation lock part 55 that this through hole hereafter will be described further for holding, so that but the first section 55-1 of anti-rotation lock part 55 can carry out axial motion in the 2nd section 53-2 of lower support element 53 can not be rotated around its axis. Such as, the through hole of the 2nd section 53-2 can be octagon, and in other words, the through hole of the 2nd section 53-2 can have octagon inner circumferential.

In preferred example, as Fig. 5 is clearly shown that, anti-rotation lock part 55 comprises: the first section (internal thread part) 55-1 as mentioned above; And the 2nd section (needle junction surface) 55-2. Can forming hole such as through hole in the first section 55-1, this through hole can have round-shaped, and can form internal thread in this through hole. Thus, first section 55-1 of anti-rotation lock part 55 is threadedly engaged by the 2nd end 51-2 of its internal thread and axle 51, thus force anti-rotation lock part 55 to carry out axial motion together with needle 14 when axle 51 is axially fixing and anti-rotation lock part 55 circumference is fixing by the rotation of axle 51, realizing the opening of electric expansion valve 1, close and the adjustment of valve opening. In addition, the first section 55-1 of anti-rotation lock part 55 can have the non-circle or Polygons periphery that in the non-circle of the through hole of the 2nd section (anti-rotation portion) 53-2 with lower support element 53 or Polygons, phase is mated. Such as, as shown in Figure 5, the first section 55-1 can have octagon periphery.

Thus, by the non-circle of through hole of the 2nd section 53-2 of lower support element 53 or the non-circle of the first section 55-1 of Polygons inner circumferential structure and anti-rotation lock part 55 or Polygons peripheral configuration, anti-rotation lock part 55 can only carry out axial translational movement and can not be rotated relative to lower support element 53 together with the needle 14 engaged with anti-rotation lock part 55.

Here, those skilled in the art are to be understood that, the structure of the 2nd section 53-2 of lower support element 53 and the first section 55-1 of anti-rotation lock part 55 is not limited thereto, but can for allowing the slip campaign between lower support element 53 and anti-rotation lock part 55 still not allow any structure carrying out relative rotary motion therebetween. Such as, the through hole of the 2nd section 53-2 of lower support element 53 can have circular inner periphery surface, but forms keyway or key in perimeter surface within it. Meanwhile, the first section 55-1 of anti-rotation lock part 55 can have circular outer peripheral surface, but forms the key mated mutually with the keyway in the 2nd section 53-2 of lower support element 53 or key or keyway on its outer circumferential surface.

2nd section 55-2 of anti-rotation lock part 55 is for engaging with the first end 14-1 of needle 14. In some instances, it is possible to the lower end at the 2nd section 55-2 arranges retaining ring 36. Retaining ring 36 is by interacting and needle 14 is held in anti-rotation lock part 55 with the outstanding head 14-4 of the radial direction being formed in its first end 14-1 place of needle 14.

In some instances, needle 14 can be engaged in the 2nd section 55-2 of anti-rotation lock part 55 fixingly.

In other example, alternately, needle 14 can be sliding engaged to the 2nd section 55-2 in anti-rotation lock part 55. Specifically, 2nd section 55-2 is formed hole such as through hole, the internal diameter of this through hole is greater than the internal diameter of the through hole of the first section 55-1, thus the inner side of anti-rotation lock part 55, roughly between the first section 55-1 and the 2nd section 55-2 formed in stage portion (sign). Compression spring (the first compression spring) 38 is set between interior stage portion and the first end 14-1 of needle 14. Thus, needle 14 can move axially together with anti-rotation lock part 55. And; when anti-rotation lock part 55 move down and when needle 14 and valve seat 18 are in time connecing; compression spring 38 apply spring power from the first end 14-1 of needle 14 so that have between needle 14 and valve seat 18 suitable for power; thus protect needle 14 and valve seat 18 not damaged because having contact buffering on the one hand, then provide on the other hand and seal effect reliably.

In some instances, as Fig. 5 is clearly shown that, it is possible in the outside of anti-rotation lock part 55, form outer step portion 55-4 between the first section (internal thread part) 55-1 and the 2nd section (needle junction surface) 55-2. Compression spring (the 2nd compression spring) 39 can be set between stage portion 55-4 and lower support element 53 outside. Compression spring 39 can provide downward spring power for anti-rotation lock part 55, so that when electric expansion valve power-off, auxiliary anti-rotation lock part 55 moves to, together with needle 14, axle 51, rotor 42 and dynamic iron 64, the position making needle 14 close valve seat 18. However, it will be understood by those skilled in the art that itself have the power of certain weight to provide this kind to move down due to anti-rotation lock part 55, needle 14, axle 51, rotor 42 and dynamic iron 64, therefore compression spring 39 can be omitted.

In preferred example, electromagnetism maintaining body 60 is arranged on above topworks 50, and the center axis of electromagnetism maintaining body 60 can be arranged to the rotation with axle 51 and roughly overlaps.

In preferred example, electromagnetism maintaining body 60 comprises: the solenoid 61 producing magnetic force when being energized; Fixing relative to solenoid 61 determines iron 62; And as mentioned above can relative to the dynamic iron 64 determined iron 62 and move. In addition, in order to easy to assembly, it is possible in solenoid 61, setting example is such as the sleeve 65 in general cylindrical shape. Determine in the upper end that iron 62 can be fixed on sleeve 65. Dynamic iron 64 can slide in sleeve 65. In addition, it is possible in the arranged outside yoke 67 of solenoid 61. Yoke 67 1 aspect can strengthen the magnetic force of electromagnetism maintaining body 60, then can be used as the fixing support of electric expansion valve 1 on the other hand.

Electromagnetism maintaining body 60 is configured for keeping the axle 51 of topworks 50. That is, electromagnetism maintaining body 60 is specially solenoid 61 at electromagnetism maintaining body 60() energising time by determine iron 62 magnetic attracting with dynamic iron 64 and by axle 51(together with the rotor 42 forming as one or being permanently connected with axle 51) remain on the first axial location as depicted in figs. 1 and 2. At this first axial location, the axial location of needle 14 can be regulated it is thus possible to the valve opening regulating electric expansion valve 1 (comprises and valve opening can be adjusted to zero when axle 51 and rotor 42 are held in fixing axial height, that is, make needle 14 close valve seat 18). On the other hand, axle 51 is released into the 2nd axial location (not shown) by electromagnetism maintaining body 60 when electromagnetism maintaining body 60 power-off. At the 2nd axial location, needle 14 closes valve seat 18. Specifically, when such as making solenoid 61 power-off of electric expansion valve 1 and then electromagnetism maintaining body 60 due to system accident power-off, determine magnetic attracting between iron 62 and dynamic iron 64 to disappear, thus fall downwards so that needle 14 closes valve seat 18 under the effect as the unit spring power of compression spring 39 under gravity and/or between the outer step portion 55-4 being arranged on lower support element 53 and anti-rotation lock part 55 jointly of dynamic iron 64, axle 51, rotor 42, anti-rotation lock part 55 and needle 14.

In preferred example, with the first end of axle 51 (upper end) but 51-1 can not engage in the way of moving axially dynamic iron 64 by rotatable.

In the example shown in the series of figures, it is possible to the lower end at dynamic iron 64 arranges accommodating hole (sign), and the first end 51-1 of axle 51 can insert in this accommodating hole. In addition, by arranging suitable bearing and suitable bearing limiting component between dynamic iron 64 and the first end 51-1 of axle 51, axle 51 can be rotated relative to dynamic iron 64, but can not move vertically relative to dynamic iron 64 and one axial motion can only be carried out with dynamic iron 64. In other words, dynamic iron 64 can non rotating, this is conducive to dynamic iron 64 and the reliable magnetic attracting determining between iron 62.

According to first embodiment of the invention, topworks 50 arranges stop mechanism 57.

In preferred example, stop mechanism 57 is arranged in the rotor chamber 42-1 of cylindrical rotor 42 at least in part. In this way, it is possible to reduce the overall axial size of electric expansion valve 1.

In preferred example, stop mechanism 57 comprises: spring spiral guide rail 57-1; And slip ring 57-3. In the first embodiment, spring spiral guide rail 57-1 is used as the first stop bit part (i.e. rotatable stop bit part) according to the present invention, and slip ring 57-3 is used as the 2nd stop bit part (can translate stop bit part) according to the present invention.

In some instances, spring spiral guide rail 57-1 can be formed on the periphery of axle 51 by injection moulding together with axle 51 and rotor magnetic ring. In other example, spring spiral guide rail 51 can be individually formed, and then be fixedly attached to the periphery of axle 51 by suitable mode (such as machinery is fixedly connected with mode). Thus, it is achieved the reliable assembling of spring spiral guide rail 57-1.

In the example shown in the series of figures, spring spiral guide rail 57-1 can at the middle section place of axle 51, arranging around axle 51 between first end 51-1 and the 2nd end 51-2 in axle.

In preferred example, as Fig. 6 is clearly shown that, spring spiral guide rail 57-1 comprises: spiral rail portion 57-11, spiral rail portion 57-11 are for supporting slip ring 57-3; First end (upper end) 57-12, first end 57-12 are used as upper position-arresting portion; And the 2nd end (lower end) 57-13, the 2nd end 57-13 is used as lower position-arresting portion.

In preferred example, as Fig. 7 is clearly shown that, slip ring 57-3 comprises: Spiral Notebook body 57-31; And extension 57-32. Spiral Notebook body 57-31 has the helicoidal configuration that the helicoidal configuration with spiral rail portion 57-11 mates mutually so that Spiral Notebook body 57-31 can be supported on spiral rail portion 57-11 and make to realize relatively sliding between the two at Spiral Notebook body 57-31 and spiral rail portion 57-11.

In preferred example, stop mechanism 57 also comprises guiding part 57-5. Guiding part 57-5 is used as the guiding part according to the present invention.

In the example shown in the series of figures, the part 57-5 that leads may be embodied as two tail rod 57-51. Tail rod 57-51 can from the upper surface of the first section 53-1 of lower support element 53 such as vertically towards upper extension. Two tail rod 57-51 are arranged in and limit gap (sign) therebetween. The free end 57-322 of the extension 57-32 of slip ring 57-3 preferably holds in the gap in sliding engagement.

In other example, alternately, the part that leads may be embodied as single root tail rod. In this case, when slip ring 57-3 is forced upwardly translation, the free end 57-322 of extension 57-32 can with a side contacts of tail rod thus along tail rod axial translation, and when slip ring 57-3 is forced to pan-down, the free end 57-322 of extension 57-32 can slip ring 57-3 after axle 51 rotates an about circle with another side contacts of tail rod thus along tail rod axial translation.

Thus, when axle 51 rotates at fixing axial location (such as the first axial location), spring spiral guide rail 57-1 and axle 51 rotate integratedly. Now, in the gap of tail rod 57-51, slip ring 57-3 can not being rotated owing to the free end 57-322 of the extension 57-32 of slip ring 57-3 is contained in, therefore the rotation of spring spiral guide rail 57-1 forces slip ring 57-3 upper and lower translation vertically. So, the slip ring 57-3 of upper and lower translation with the upper position-arresting portion 57-12 and lower position-arresting portion 57-13 of the spring spiral guide rail 57-1 rotated at fixing axial location to connecing, thus can realize the rotation stop bit of axle 51 and then whole topworks 50 vertically.

The working process of the electric expansion valve 1 according to first embodiment of the invention will be described below.

It is described being in state as shown in Figure 1 from electric expansion valve 1. In FIG, electromagnetism maintaining body 60 is executed electricity, thus dynamic iron 62 is together with determining iron 64 magnetic attracting, thus axle 51 and then whole topworks 50 is remained on the first axial location. Meanwhile, in FIG, slip ring 57-3 is in upper position-arresting position (that is, the upper position-arresting portion 57-12 of slip ring 57-3 and spring spiral guide rail 57-1 is to connecing). Accordingly, axle 51 is in the first rotation stop bit position, and needle 14 is in fully open position. Here, it will be understood and appreciated by those or skill in the art that electric expansion valve 1 can also be designed to the needle 14 when slip ring 57-3 is in lower position-arresting position is in fully open position.

Then, when needing to close electric expansion valve 1 or need the valve opening regulating electric expansion valve 1, electricity is executed to driving mechanism 40 so that rotor 42 is along first party to rotation. The rotation of rotor 42 causes axle 51 also to rotation thus to move away the first rotation stop bit position along first party. Along with axle 51 in the first axial positions along first party to rotation, the anti-rotation lock part 55 that the 2nd end 51-2 of its first section (internal thread part) 55-1 and axle 51 is threadedly engaged is forced to pan-down. Now, the needle 14 of the 2nd section (needle junction surface) 55-2 being held in anti-rotation lock part 55 along with the pan-down of anti-rotation lock part 55 and pan-down. Thus, only can suitably reduce the valve opening of electric expansion valve 1, can also by making the 2nd end 14-2 of needle 14 and valve seat 18 to connecing and make electric expansion valve 1 close (as shown in Figure 2) completely, such as, this depends on the specific control (by the rotation of motor 40 being controlled and electric expansion valve 1 is carried out specific control) carried out by electric expansion valve 1.

Meanwhile, along with axle 51 in the first axial positions along first party to rotation, the spring spiral guide rail 57-1 forming as one or being permanently connected with axle 51 is also along first party to rotation. The rotation of spring spiral guide rail 57-1 forces slip ring 57-3 pan-down vertically. Slip ring 57-3 can vertically pan-down until the lower position-arresting portion 57-13 of abutment end 57-311 and spring spiral guide rail 57-1 of Spiral Notebook body 57-31 of slip ring 57-3 is in lower position-arresting position to connecing, as shown in Figure 2. Now, accordingly, axle 51 is in the 2nd rotation stop bit position.

According to first embodiment of the invention, preferably, electric expansion valve 1 is designed to when slip ring 57-3 is in lower position-arresting position, 2nd end 14-2 of needle 14 and valve seat 18 to connect and the first compression spring 38 applied suitable spring power from the first end 14-1 of needle 14 so that have between needle 14 and valve seat 18 suitable for power, but the first compression spring 38 is not yet compressed into and reaches its minimum axial length. Thus, can provide on the one hand and seal reliably between needle 14 and valve seat, then be possible to prevent screw thread pair (i.e. the 2nd end 51-2 of the axle 51 and internal thread part 55-1 of anti-rotation lock part 55) on the other hand and kill because of over-rotation.

Then, from the state shown in Fig. 2, when electric expansion valve 1 opened by needs, electricity is executed to driving mechanism 40 so that rotor 42 rotates along with first party to contrary second direction. The rotation of rotor 42 cause axle 51 also along second direction rotate thus move away the 2nd rotation stop bit position. Along with axle 51 rotates along second direction in the first axial positions, the anti-rotation lock part 55 that the 2nd end 51-2 of its first section (internal thread part) 55-1 and axle 51 is threadedly engaged is forced upwardly translation. Then, the needle 14 of the 2nd section (needle junction surface) 55-2 being held in anti-rotation lock part 55 also will upwards translate along with the upwards translation of anti-rotation lock part 55, such that it is able to open electric expansion valve 1. In this respect, it is possible to only suitably increase electric expansion valve 1 valve opening, it is possible to so that electric expansion valve 1 open completely (that is, make needle 14 be in fully open position, as shown in Figure 1).

Meanwhile, along with axle 51 rotates along second direction in the first axial positions, the spring spiral guide rail 57-1 forming as one with axle 51 or being permanently connected also rotates along second direction. Spring spiral guide rail 57-1 forces slip ring 57-3 upwards to translate vertically along the rotation of second direction. Slip ring 57-3 can upwards translate vertically until the upper position-arresting portion 57-12 of extension 57-32 and spring spiral guide rail 57-1 of slip ring 57-3 is in upper position-arresting position again to connecing, as shown in Figure 1. Now, accordingly, axle 51 is back to the first rotation stop bit position.

In addition, when electric expansion valve 1 in the condition shown in figure 1 suddenly accident power-off time, due to solenoid 61 power-off of electromagnetism maintaining body 60, determine iron 62 and no longer attract to move iron 64. Thus, fall downwards so that needle 14 closes valve seat 18 under the effect as the unit spring power of compression spring 39 under gravity and/or between the outer step portion 55-4 being arranged on lower support element 53 and anti-rotation lock part 55 jointly of dynamic iron 64, axle 51, rotor 42, anti-rotation lock part 55 and needle 14.

According to first embodiment of the invention, following useful effect at least can be provided.

(1) according to first embodiment of the invention, due to adopt anti-rotational design (that is, it is provided with anti-rotation lock part and lower support element, and the structure of anti-rotation lock part and lower support element makes anti-rotation lock part can only carry out axial translational movement and can not be rotated relative to lower support element), therefore the needle engaged with anti-rotation lock part axial direction due along electric expansion valve when not rotating around himself axis moves up and down, which avoid needle and produce transverse shakiness in the process moved up and down, and then guarantee the good bond of needle and valve seat. and, move up and down the end (lower end) that it also avoid needle due to needle when not rotating around himself axis and produce to wear and tear because of relative rotation therebetween with valve seat.

(2) according to first embodiment of the invention, owing to being provided with stop mechanism, the rotation of axle therefore can suitably be limited. Thus, such as, in the standard-sized sheet and closed positions of valve, avoid the screw thread pair caused because of rotor and axle over-rotation and kill and wear problem, thus ensure the smooth transmission of screw thread pair.

(3) according to first embodiment of the invention, owing to being provided with electromagnetism maintaining body, when therefore making the unexpected power-off of electric expansion valve when system accident power-off, although the topworks being made up of thread screw mechanism can not move needle to close valve seat, but under its own weight or under the effect of the bias force of other elasticity component, fall back to the position that needle can be made to close valve seat, therefore can reliably close electric expansion valve owing to being discharged by electromagnetism maintaining body as the axle of a part for topworks. Consequently, it is possible to realize the function automatically closing electric expansion valve when power-off.

Especially, according to first embodiment of the invention, while realizing needle upper and lower translation, it is achieved the rotation stop bit of rotor and axle causes screw thread pair occlusion stuck to avoid because of screw thread pair over-rotation.

Stop mechanism according to first embodiment of the invention can have some modification.

Such as, as shown in Figure 8 the stereographic map of the modification illustrating the stop mechanism according to first embodiment of the invention (Fig. 8 be), in a kind of modification 57 ' of the stop mechanism according to first embodiment of the invention, the free end 57-322 ' of the extension 57-32 of slip ring 57-3 is formed as ring body (being preferably annulus body). In addition, the part 57-5 that leads is embodied as single root tail rod 57-51 ' (preferably having the tail rod of rounded section). Tail rod 57-51 ' can from the upper surface of the first section 53-1 of lower support element 53 such as vertically towards upper extension. The ring body 57-322 ' of the extension 57-32 of slip ring 57-3 is preferably in sliding engagement around tail rod 57-51 ' layout. The electric expansion valve comprising this stop mechanism modification according to first embodiment of the invention except effect as above (1), (2) and (3) can be provided, also at least have that the structure of guiding part is more simple and guiding part and slip ring coordinate more stable advantage.

More such as, what the part that leads may be embodied as the free end with the extension for holding slip ring erects the single root tail rod to chute road. The electric expansion valve comprising this stop mechanism modification according to first embodiment of the invention, except can providing effect as above (1), (2) and (3), also at least has the more simple advantage of structure of guiding part.

Electric expansion valve according to first embodiment of the invention can not comprise electromagnetism maintaining body 60. In this case, it is possible to by suitable axial limiting mechanism, the axle 51 of topworks 50 is rotatably held in fixing axial location. The electric expansion valve not comprising electromagnetism maintaining body according to first embodiment of the invention at least can provide effect as above (1) and (2).

Next, the structure of the electric expansion valve according to second embodiment of the invention is described with reference to Fig. 9 to Figure 13. wherein, the major parts that Fig. 9 is the electric expansion valve according to second embodiment of the invention (comprises stop mechanism, axle, lower support element, anti-rotation lock part, needle) assembled state stereographic map, the major parts that Figure 10 is the electric expansion valve according to second embodiment of the invention (comprises stop mechanism, axle, lower support element, anti-rotation lock part, needle) assembled state longitudinal sectional view, Figure 11 is the stereographic map with the axle rotating bit-stopping structure according to second embodiment of the invention, Figure 12 is the stereographic map of the lower support element with guiding structure according to second embodiment of the invention, and Figure 13 is the stereographic map with the anti-rotation lock part rotating bit-stopping structure according to second embodiment of the invention.

In second embodiment of the invention, adopt the Reference numeral identical with first embodiment of the invention to refer to for identical parts, and by omit to these same parts repeat describe.

The difference of the 2nd enforcement mode and the first enforcement mode is the structure of stop mechanism.

According to second embodiment of the invention, topworks 50 arranges stop mechanism 57A.

In preferred example, stop mechanism 57A is arranged in the rotor chamber 42-1 of cylindrical rotor 42 at least in part. In this way, it is possible to reduce the overall axial size of electric expansion valve.

In preferred example, stop mechanism 57A comprises: the rotatable stop bit part 57-1A being fixedly arranged at axle 51; And it is fixedly arranged at the translated stop bit part 57-3A of anti-rotation lock part 55. In this second embodiment, rotatable stop bit part 57-1A is used as the first stop bit part (i.e. rotatable stop bit part) according to the present invention, and can translate stop bit part 57-3A and be used as the 2nd stop bit part (can translate stop bit part) according to the present invention.

In preferred example, rotatable stop bit part 57-1A comprise that be arranged at the periphery of axle 51, along axle 51 axial direction due between separate suitable distance, upper convex portion (upper position-arresting portion) 57-12A outwardly relative to the outer periphery of axle 51 and lower protuberance (lower position-arresting portion) 57-13A.

In some instances, upper convex portion 57-12A and lower protuberance 57-13A can be injection molded into one with axle 51.

In other example, upper convex portion 57-12A and lower protuberance 57-13A can be individually formed, and then be fixedly attached to the periphery of axle 51 by suitable mode (such as machinery is fixedly connected with mode).

In the example of some, lower protuberance 57-13A can be formed as the collar 51-4 from axle 51 and upwards extend (see Figure 11). , it is possible in the periphery of axle 51, above collar 51-4, place arranges axle collar 51-5, in addition and upper convex portion 57-12A can be formed as the axle collar 51-5 from axle 51 extends downwards (see Figure 11). In this case, it may be preferred that the periphery that lower protuberance 57-13A is formed as its periphery and collar 51-4 is put down together, and the periphery that upper convex portion 57-12A is formed as its periphery and axle collar 51-5 is put down together, as shown in figure 11.

In preferred example, as Figure 13 is clearly shown that, stop bit part 57-3A can be translated and comprise: the extension arm 57-36 outwards stretched out from the outer periphery of the upper end of the first section 55-1 of anti-rotation lock part 55; From the armstand 57-37 that the outer end of extension arm 57-36 upwards extends; Extend radially inwardly from the upper end of armstand 57-37 to meeting portion 57-38; And from the additional extension arm 57-39 that the periphery of the upper end of the first section 55-1 of anti-rotation lock part 55 and extension arm 57-36 diametrically contraposition ground are radially outward stretched out.

In preferred example, stop mechanism 57 also comprises guiding structure 57-5A. Guiding structure 57-5A is used as the guiding part according to the present invention.

In the example shown in the series of figures, the structure 57-5A that leads may be embodied as the notch 57-56 and additional notch 57-57 of the diametrically contraposition at the first section 53-1 place being formed at lower support element (being used as the strut member according to the present invention) 53. Notch 57-56 is for holding and guides the extension arm 57-36 that at least can translate stop bit part 57-3A, and additional notch 57-57 for holding and guides the additional extension arm 57-39 that can translate stop bit part 57-3A.

Here, it will be understood and appreciated by those or skill in the art that and can omit additional extension arm 57-39 and additional notch 57-57. Further, it will be understood by those skilled in the art that extension arm 57-36 and additional extension arm 57-39 and notch 57-56 and additional notch 57-57 need not be arranged on diametrically contraposition ground.

The working process of the stop mechanism of the electric expansion valve according to second embodiment of the invention will simply be described below.

When axle 51 rotates forward or backwards at fixing axial location (such as, the first axial location when being provided with electromagnetism maintaining body), the rotatable stop bit part 57-1A and the axle 51 that are fixedly arranged at axle 51 rotate integratedly. Now, the translated stop bit part 57-3A being fixedly arranged at anti-rotation lock part 55 along with anti-rotation lock part 55 upper and lower translation motion and in the guiding structure 57-5A being formed at lower support element 53 place upper and lower translation vertically. So, vertically the translated stop bit part 57-3A of upper and lower translation with upper convex portion (upper position-arresting portion) 57-12A and lower protuberance (lower position-arresting portion) 57-13A of the rotatable stop bit part 57-1A rotated at fixing axial location to connecing, thus the rotation stop bit of axle 51 and then whole topworks 50 can be realized to the portion 57-38 of connecing.

Equally, identical with the electric expansion valve according to first embodiment of the invention, at least can provide effect (1), (2) and (3) etc. according to the electric expansion valve of second embodiment of the invention.

In a word, according in the electric expansion valve of the present invention, it is possible to comprise following advantageous scheme.

Preferably, described movable valve member is needle, and described valve assembly also comprises valve seat, and, described needle comprises first end and the 2nd end, and the 2nd end of described needle is used for engaging with described valve seat thus closes described valve seat.

Preferably, one end of described axle is provided with outside screw.

Preferably, the collar being positioned at place above described one end of described axle it is provided with at the lower section place of described axle.

Preferably, described strut member comprises the first section and the 2nd section, first section of described strut member is formed with through hole, first section of described strut member slidably receives described collar by its through hole, further, in the 2nd section of described strut member, it is formed with non-circle or Polygons through hole.

Preferably, described anti-rotation lock part comprises the first section and the 2nd section, first section of described anti-rotation lock part is formed with the hole being provided with internal thread, the hole being provided with internal thread of the first section of described anti-rotation lock part and the externally threaded described one end that is provided with of described axle are threadedly engaged, first section of described anti-rotation lock part is received in the through hole of the 2nd section of described strut member, and there is non-circle or Polygons periphery that in the non-circle of the through hole of the 2nd section with described strut member or Polygons, phase is mated, and, the first end of described needle in a fixed manner or slidably mode be arranged in the 2nd section of described anti-rotation lock part.

Preferably, described first stop bit part is formed in the spring spiral guide rail of the periphery of described axle, and described 2nd stop bit part is the slip ring that can slide along described spring spiral guide rail.

Preferably, described spring spiral guide rail comprises spiral rail portion, the first end as upper position-arresting portion and the 2nd end as lower position-arresting portion.

Preferably, described slip ring comprises Spiral Notebook body and extension.

Preferably, described Spiral Notebook body is configured with the helicoidal configuration that the helicoidal configuration with described spiral rail portion mates mutually, to make described Spiral Notebook body can slidably be supported on described spiral rail portion, described Spiral Notebook body is configured with abutment end, and, described extension is constructed to be permeable to the first end with described spring spiral guide rail to connecing, and described abutment end is constructed to be permeable to the 2nd end with described spring spiral guide rail to connecing.

Preferably, the rotation of described axle is limited between the first rotation stop bit position and the 2nd rotation stop bit position, in described first rotation stop bit position, the first end of described extension and described spring spiral guide rail is to connecing, in described 2nd rotation stop bit position, the 2nd end of described abutment end and described spring spiral guide rail is to connecing.

Preferably, described stop mechanism also comprises the guiding part for guiding described 2nd stop bit part to translate vertically.

Preferably, described guiding part is embodied as two tail rods, and described tail rod upwards extends from the upper end of described strut member, and described tail rod is arranged in and limits gap therebetween, and, the free end of described extension is received in described gap.

Alternately, described guiding part is embodied as single root tail rod, and described tail rod upwards extends from the upper end of described strut member, and, the free end of described extension can contact with described tail rod thus along described tail rod axial translation.

Alternately, described guiding part is embodied as single root tail rod, and described tail rod upwards extends from the upper end of described strut member, and, the free end of described extension is formed as ring body and is enclosed within described tail rod.

Alternately, described guiding part is embodied as single root tail rod, and described tail rod upwards extends from the upper end of described strut member, and described tail rod has the erecting to chute road of the free end for receiving described extension.

Alternately, described first stop bit part comprises the upper convex portion as upper position-arresting portion and the lower protuberance as lower position-arresting portion, further, the upper convex portion of described first stop bit part and lower protuberance be arranged at described axle periphery and along described axle axial direction due between spaced a predetermined distance from.

Preferably, described 2nd stop bit part is arranged at described anti-rotation lock part and can translate vertically integratedly with described anti-rotation lock part.

Preferably, described 2nd stop bit part comprises: the extension arm outwards stretched out from the outer periphery of the upper end of described anti-rotation lock part; From the armstand that the outer end of described extension arm upwards extends; And extend radially inwardly from the upper end of described armstand to meeting portion, described can with the upper convex portion of described first stop bit part and lower protuberance to connecing to the portion of connecing.

Preferably, the rotation of described axle is limited between the first rotation stop bit position and the 2nd rotation stop bit position, in described first rotation stop bit position, the described upper convex portion to connecing portion and described first stop bit part is to connecing, in described 2nd rotation stop bit position, the described lower protuberance to connecing portion and described first stop bit part is to connecing.

Preferably, described guiding part comprises the notch being formed at described strut member place, and described notch is for receiving and guides at least described extension arm.

Preferably, the additional extension arm that described 2nd stop bit part also comprises the periphery of the upper end from described anti-rotation lock part and described extension arm diametrically contraposition ground radially outward stretches out, and, described guiding part also comprises the additional notch being formed at described strut member place, and described additional notch is for receiving and guides described additional extension arm.

Preferably, described driving mechanism comprises rotor, and described rotor is embodied as round barrel-shaped magnet ring that form with described axle or be permanently connected, one end open, thus limits rotor chamber, further, described stop mechanism is arranged in described rotor chamber at least in part.

Preferably, also comprise electromagnetism maintaining body, described electromagnetism maintaining body is constructed to be permeable to when being energized, described axle be remained on the first axial location and described axle is released into when power-off the 2nd axial location, in described first axial location, the axial location of described movable valve member can be regulated when described axle is held in fixing axial height, in described 2nd axial location, described movable valve member closes valve seat.

Preferably, produce the solenoid of magnetic force when described electromagnetism maintaining body is included in energising, fixing relative to described solenoid determine iron and relative to the described dynamic iron determined iron and can move, and, one end of described axle is connected with described dynamic iron.

In present specification, directional terminology " on ", the use of D score and " top " etc. is only for the object being convenient to describe, and should not be considered as being restrictive.

Although with reference to illustrative embodiments, invention has been described, it is to be understood that, the present invention is not limited to the concrete example/enforcement mode describing in detail and illustrating here, when not deviateing claim book limited range, illustrative embodiments can be made various change by those skilled in the art.

Claims

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

Valve assembly (10), described valve assembly (10) comprise movable valve member (14) and for the flow of the fluid flowing through described electric expansion valve (1) is regulated;

Topworks (50), described topworks (50) comprises axle (51), strut member (53), and anti-rotation lock part (55) and for driving described movable valve member (14) to carry out axial motion, described axle (51) is threadedly engaged with one end of described anti-rotation lock part (55), described movable valve member (14) is arranged at the other end of described anti-rotation lock part (55), described strut member (53) receives described anti-rotation lock part (55) at least partially, make the described anti-rotation lock part (55) when described axle (51) rotates can carry out axial motion relative to described strut member (53) together with described movable valve member (14) but can not be rotated, and

Driving mechanism (40), described driving mechanism (40) for be described topworks (50) provide power,

Wherein, described electric expansion valve (1) also comprises stop mechanism (57,57 ', 57A),

And, described stop mechanism (57, 57 ', 57A) comprise the first stop bit part (57-1, 57-1A) and the 2nd stop bit part (57-3, 57-3A), described first stop bit part (57-1, 57-1A) can rotate integratedly with described axle (51), described 2nd stop bit part (57-3, 57-3A) can translate vertically along with the rotation of described axle (51), so that described first stop bit part (57-1, 57-1A) with described 2nd stop bit part (57-3, 57-3A) can mutually to connecing to limit the scope of the rotation of described axle (51).

2. electric expansion valve according to claim 1 (1), wherein

Described movable valve member (14) is needle (14),

Described valve assembly (10) also comprises valve seat (18),

And, described needle (14) comprises first end (14-1) and the 2nd end (14-2), and the 2nd end (14-2) of described needle (14) for engaging with described valve seat (18) thus closes described valve seat (18).

3. electric expansion valve according to claim 2 (1), wherein, one end (51-2) of described axle (51) is provided with outside screw.

4. electric expansion valve according to claim 3 (1), wherein, the collar (51-4) at the top place of the described one end (51-2) being positioned at described axle (51) it is provided with at the lower section place of described axle (51).

5. electric expansion valve according to claim 4 (1), wherein

Described strut member (53) comprises the first section (53-1) and the 2nd section (53-2),

First section (53-1) of described strut member (53) is formed with through hole, first section (53-1) of described strut member (53) slidably receives described collar (51-4) by its through hole

Further, the 2nd section (53-2) of described strut member (53) is formed with non-circular through hole.

6. electric expansion valve according to claim 5 (1), wherein

Described anti-rotation lock part (55) comprises the first section (55-1) and the 2nd section (55-2),

First section (55-1) of described anti-rotation lock part (55) is formed with the hole being provided with internal thread, the hole being provided with internal thread of first section (55-1) of described anti-rotation lock part (55) and the externally threaded described one end (51-2) that is provided with of described axle (51) are threadedly engaged

First section (55-1) of described anti-rotation lock part (55) is received in the through hole of the 2nd section (53-2) of described strut member (53) and has the non-circular perimeter that the non-circular inner periphery of the through hole of the 2nd section (53-2) with described strut member (53) mates mutually

Further, the first end (14-1) of described needle (14) in a fixed manner or slidably mode be arranged in the 2nd section (55-2) of described anti-rotation lock part (55).

7. electric expansion valve according to claim 4 (1), wherein

Further, in the 2nd section (53-2) of described strut member (53), it is formed with Polygons through hole.

8. electric expansion valve according to claim 7 (1), wherein

First section (55-1) of described anti-rotation lock part (55) is received in the through hole of the 2nd section (53-2) of described strut member (53) and has the Polygons periphery that in the Polygons of the through hole of the 2nd section (53-2) with described strut member (53), phase is mated

9. electric expansion valve according to any one of claim 1 to 8 (1), wherein, described first stop bit part (57-1) is formed in spring spiral guide rail (57-1) of the periphery of described axle (51), and described 2nd stop bit part (57-3) is the slip ring (57-3) that can slide along described spring spiral guide rail (57-1).

10. electric expansion valve according to claim 9 (1), wherein, described spring spiral guide rail (57-1) comprises spiral rail portion (57-11), the first end (57-12) as upper position-arresting portion and the 2nd end (57-13) as lower position-arresting portion.

11. electric expansion valves according to claim 10 (1), wherein, described slip ring (57-3) comprises Spiral Notebook body (57-31) and extension (57-32).

12. electric expansion valves according to claim 11 (1), wherein

Described Spiral Notebook body (57-31) is configured with the helicoidal configuration that the helicoidal configuration with described spiral rail portion (57-11) mates mutually, to make described Spiral Notebook body (57-31) can slidably be supported on described spiral rail portion (57-11)

Described Spiral Notebook body (57-31) is configured with abutment end (57-311),

And, described extension (57-32) is constructed to be permeable to the first end (57-12) with described spring spiral guide rail (57-1) to connecing, and described abutment end (57-311) is constructed to be permeable to the 2nd end (57-13) with described spring spiral guide rail (57-1) to connecing.

13. electric expansion valves according to claim 11 (1), wherein, the rotation of described axle (51) is limited between the first rotation stop bit position and the 2nd rotation stop bit position, in described first rotation stop bit position, the first end (57-12) of described extension (57-32) and described spring spiral guide rail (57-1) is to connecing, in described 2nd rotation stop bit position, the 2nd end (57-13) of described abutment end (57-311) and described spring spiral guide rail (57-1) is to connecing.

14. electric expansion valves according to claim 11 (1), wherein, described stop mechanism (57,57 ') also comprises the guiding part (57-5) for guiding described 2nd stop bit part (57-3) to translate vertically.

15. electric expansion valves according to claim 14 (1), wherein

Described guiding part (57-5) is embodied as two tail rods (57-51), described tail rod (57-51) upwards extends from the upper end of described strut member (53), described tail rod (57-51) is arranged in and limits gap therebetween

Further, the free end (57-322) of described extension (57-32) is received in described gap.

16. electric expansion valves according to claim 14 (1), wherein

Described guiding part (57-5) is embodied as single root tail rod, and described tail rod upwards extends from the upper end of described strut member (53),

Further, the free end (57-322) of described extension (57-32) can contact with described tail rod thus along described tail rod axial translation.

17. electric expansion valves according to claim 14 (1), wherein

Described guiding part (57-5) is embodied as single root tail rod (57-51 '), and described tail rod (57-51 ') upwards extends from the upper end of described strut member (53),

Further, the free end (57-322 ') of described extension (57-32) is formed as ring body and is enclosed within described tail rod (57-51 ').

18. electric expansion valves according to claim 14 (1), wherein, described guiding part (57-5) is embodied as single root tail rod, described tail rod upwards extends from the upper end of described strut member (53), and described tail rod has the erecting to chute road of the free end for receiving described extension (57-32) (57-322).

19. electric expansion valves according to any one of claim 1 to 8 (1), wherein

Described first stop bit part (57-1A) comprises the upper convex portion as upper position-arresting portion (57-12A) and is used as the lower protuberance (57-13A) in lower position-arresting portion,

Further, the upper convex portion (57-12A) of described first stop bit part (57-1A) and lower protuberance (57-13A) be arranged at described axle (51) periphery and along described axle (51) axial direction due between spaced a predetermined distance from.

20. electric expansion valves according to claim 19 (1), wherein, described 2nd stop bit part (57-3A) is arranged on described anti-rotation lock part (55) and can translate vertically integratedly with described anti-rotation lock part (55).

21. electric expansion valves according to claim 20 (1), wherein, described 2nd stop bit part (57-3A) comprising:

From the extension arm (57-36) that the outer periphery of the upper end of described anti-rotation lock part (55) is outwards stretched out;

The armstand (57-37) upwards extended from the outer end of described extension arm (57-36); And

Extend radially inwardly from the upper end of described armstand (57-37) to meeting portion (57-38), described can with the upper convex portion (57-12A) of described first stop bit part (57-1A) and lower protuberance (57-13A) to connecing to meeting portion (57-38).

22. electric expansion valves according to claim 21 (1), wherein, the rotation of described axle (51) is limited between the first rotation stop bit position and the 2nd rotation stop bit position, in described first rotation stop bit position, the described upper convex portion (57-12A) to connecing portion (57-38) and described first stop bit part (57-1A) is to connecing, in described 2nd rotation stop bit position, the described lower protuberance (57-13A) to connecing portion (57-38) and described first stop bit part (57-1A) is to connecing.

23. electric expansion valves according to claim 21 (1), wherein, described stop mechanism (57A) also comprises the guiding part (57-5A) for guiding described 2nd stop bit part (57-3A) to translate vertically.

24. electric expansion valves according to claim 23 (1), wherein, described guiding part (57-5A) comprises the notch (57-56) being formed at described strut member (53) place, and described notch (57-56) is for receiving and guides at least described extension arm (57-36).

25. electric expansion valves according to claim 24 (1), wherein

The additional extension arm (57-39) that described 2nd stop bit part (57-3A) also comprises the periphery of the upper end from described anti-rotation lock part (55) and described extension arm (57-36) diametrically contraposition ground radially outward stretches out

And, described guiding part (57-5A) also comprises the additional notch (57-57) being formed at described strut member (53) place, and described additional notch (57-56) is for receiving and guides described additional extension arm (57-39).

26. electric expansion valves according to any one of claim 1 to 8 (1), wherein

Described driving mechanism (40) comprises rotor (42), described rotor (42) is embodied as round barrel-shaped magnet ring that form with described axle (51) or be permanently connected, one end open, thus limit rotor chamber (42-1)

Further, described stop mechanism (57,57 ', 57A) is arranged in described rotor chamber (42-1) at least in part.

27. electric expansion valves according to any one of claim 1 to 8 (1), also comprise electromagnetism maintaining body (60), described electromagnetism maintaining body (60) is constructed to be permeable to when being energized, described axle (51) be remained on the first axial location and when power-off, described axle (51) is released into the 2nd axial location, in described first axial location, the axial location of described movable valve member (14) can be regulated when described axle (51) are held in fixing axial height, in described 2nd axial location, described movable valve member (14) closes valve seat (18).

28. electric expansion valves according to claim 27 (1), wherein

Produce the solenoid (61) of magnetic force when described electromagnetism maintaining body (60) is included in energising, fixing relative to described solenoid (61) determine iron (62) and relative to the described dynamic iron (64) determined iron (62) and can move

Further, one end (51-1) of described axle (51) is connected with described dynamic iron (64).