CN215410288U

CN215410288U - Electronic expansion valve with buffering effect

Info

Publication number: CN215410288U
Application number: CN202023214147.0U
Authority: CN
Inventors: 蒋开洪; 段小成; 张紫星; 张科迪; 王晨
Original assignee: Ningbo Tuopu Group Co Ltd
Current assignee: Ningbo Tuopu Group Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-01-04
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses an electronic expansion valve with a buffering effect, which comprises a stator assembly and a valve seat assembly, wherein the valve seat assembly is installed at the lower part of the stator assembly, the valve seat assembly comprises an end cover assembly, a magnetism isolating pipe, a valve needle assembly and a valve seat assembly, a screw rod assembly is arranged inside the magnetism isolating pipe, the valve needle assembly comprises a valve needle and a valve needle spring arranged in an inner hole at the lower end of the valve needle, the lower end of the valve needle is inserted and provided with a valve needle, a balance flow passage is formed in the middle of the valve needle, a lining is sleeved on the outer side of the upper part of the valve needle and abuts against one end of the valve needle spring, a valve needle sleeve is arranged at the lower end of the lining, an O-shaped ring in the valve needle is installed between the inner side of the valve needle sleeve and the valve needle head, and the screw rod in the screw rod assembly is axially inserted into a central threaded through hole of the valve needle. The valve has the advantages of pressure balancing function, long service life, buffering effect when the valve is closed, and prevention of the problem that the valve cannot be opened due to thread blockage.

Description

Electronic expansion valve with buffering effect

Technical Field

The utility model relates to the field of expansion valves, in particular to an electronic expansion valve with a buffering effect.

Background

Energy conservation and emission reduction are problems to be solved urgently by people nowadays. The throttling device plays a key role in the refrigeration system, and the energy consumption of the whole refrigeration system can be reduced by selecting a proper throttling mechanism to be matched with the refrigeration system. The working principle of throttling is that when the refrigerant flows through the valve, the flow section is suddenly contracted, the flow speed of the fluid is accelerated, and the pressure is reduced, so that the functions of regulating the flow, controlling the degree of superheat and evaporating the liquid level are achieved. Therefore, the flow regulation of the throttling mechanism plays an important role in saving energy and reducing consumption of the refrigerating device. On some occasions with severe load change or wide operation condition range, the traditional throttling elements (such as capillary tubes, thermal expansion valves and the like) cannot meet the requirements on comfort and energy conservation. The temperature sensing package of the thermostatic expansion valve has obvious delay characteristic, and is difficult to cooperate with the displacement of the compressor to make quick and effective reaction to the flow change, finally resulting in the oscillation of system regulation, causing the unstable operation of the machine, even damaging the compressor network, so the electronic expansion valve is gradually replacing the traditional throttling element. The electronic expansion valve is superior to the traditional throttling mechanism in superheat degree control (liquid level control) and flow regulation, and has the advantages of higher reaction speed, wider regulation range, more obvious energy-saving effect and wide application prospect.

The heat exchange efficiency of the refrigerant system mainly depends on the pressure of the refrigerant at a high-pressure end in the system and the outlet temperature of the cooling device, the control of the refrigerant flow is usually determined according to the outlet temperature and the pressure of the cooling device, the flow control is relatively complex, an electronic expansion valve is generally adopted for throttling and depressurizing the refrigerant from the outlet of the cooling device, and the flow of the refrigerant sent from the cooling device to the evaporation device is adjusted according to the temperature of the outlet of the evaporation device or the temperature of other points needing to be adjusted, so that the requirement of continuous change of refrigeration load is met. However, the pressure difference between the high pressure and the low pressure at the inlet and the outlet of the electronic expansion valve of the refrigerant system is large, and the pressure difference acts on the valve needle of the electronic expansion valve, so that the action resistance of the valve needle is increased, when the electronic expansion valve needs to be opened again after being closed, the valve needle can open the refrigerant channel only by overcoming the large pressure difference resistance, the valve needle is not easy to open, if a motor with large torque is adopted to overcome the resistance, the coil volume of the electronic expansion valve is relatively increased, the control precision is reduced, the installation is limited by space, the power consumption of the system is large, and the cost is increased. The stator assembly generates static electricity and a magnetic field in the electrifying process, and the static electricity and the magnetic field influence or interfere the transmission of control signals, so that the action of the valve needle is influenced, and the control precision of the electronic expansion valve is reduced.

And because the frequent rotation of lead screw and magnetic rotor can make lead screw and magnetic rotor's wearing and tearing relatively serious, appear the problem of blocking easily after long-time the use, the life of whole expansion valve is not good.

In addition, in the process of closing the valve of the expansion valve, the valve needle stops suddenly when encountering a lower stroke limit, so that a large inertia force is generated, threads are combined, the axial force of a part structure is too large, and the valve cannot be opened, so that the conventional expansion valve needs to be improved.

SUMMERY OF THE UTILITY MODEL

The electronic expansion valve with the buffering effect has the advantages of high precision, obvious energy-saving effect, simple structure, convenience in installation, pressure balancing function and long service life, has the buffering effect when the valve is closed, and prevents the problem that the valve cannot be opened due to thread blockage.

In order to achieve the purpose, the utility model provides the following technical scheme: an electronic expansion valve with a buffering effect comprises a stator assembly and a valve seat assembly, wherein the valve seat assembly is installed at the lower part of the stator assembly, the stator assembly comprises a shell and a stator assembly arranged in the shell, the valve seat assembly comprises an end cover component, a magnetism isolating pipe, a valve needle component and a valve seat component, the magnetism isolating pipe is arranged at the upper end of the valve seat component and is inserted into the stator assembly, a screw rod component is arranged inside the magnetism isolating pipe, the end cover component is positioned at the upper end of the magnetism isolating pipe and consists of an end cover, a cup-shaped bearing and a spring pressing sheet, the spring pressing sheet fixes the cup-shaped bearing in a cup-shaped inner cavity in the middle of the end cover, the upper end of the screw rod is inserted into the cup-shaped bearing, a flexible graphite gasket is installed between the lower end of the cup-shaped bearing and the screw rod component, the valve needle component comprises a valve needle and a valve needle spring arranged in an inner hole at the lower end of the valve needle, the lower extreme of needle insert and be provided with the valve needle, the middle part of valve needle open and to have balanced runner, the upper portion outside of valve needle cup jointed the bush, the one end of bush and needle spring withstand, the lower extreme of bush be provided with the valve needle cover, leak O type circle in the needle is installed to inboard and the valve needle head of valve needle cover, the lead screw subassembly in the lead screw axial insert the central thread through-hole of needle in, lead screw and needle between leave the thread clearance.

Preferably, the screw assembly comprises an upper wear-resistant ring, a lower wear-resistant ring, a magnetic rotor support frame, a magnetic rotor and a screw, wherein the magnetic rotor support frame is injection-molded on the screw, the magnetic rotor is bonded on the magnetic rotor support frame, clamping grooves are formed in the upper and lower parts of the magnetic rotor support frame, and clamping claws of the upper wear-resistant ring and the lower wear-resistant ring are clamped in the corresponding clamping grooves.

Preferably, a valve needle sleeve assembly is arranged in the valve seat assembly and comprises a ball bearing and a valve needle sleeve, and the ball bearing is arranged at the concave step of the valve needle sleeve.

Preferably, the upper end of the valve needle sleeve is provided with a raised spin riveting closing part at the edge of the concave step to axially fix the ball bearing, two sides of the valve needle sleeve are provided with two limiting grooves, and the upper end of the valve needle extends into the limiting grooves to axially slide.

Preferably, the outer side of the valve needle is provided with a sealing structure, the sealing structure comprises a main sealing ring and an O-shaped ring arranged on the outer side of the main sealing ring, a pressing ring is axially arranged on the upper side of the main sealing ring, and sliding blocks embedded into the limiting grooves are arranged on two sides of the upper portion of the valve needle.

Preferably, the valve seat assembly comprises a valve seat and a valve base, the valve base is arranged at the lower end of the valve seat, and the upper end of the valve seat is connected with the magnetism isolating pipe in a welding mode.

Preferably, the stator assembly comprises a shell and a stator assembly, the stator assembly comprises a stator shell, a winding coil, a framework, an electromagnetic pole plate and a Pin needle, the stator shell and the electromagnetic pole plate are provided with positioning holes, the framework is provided with positioning pins, the stator shell, the electromagnetic pole plate and the framework are connected in an inserting mode through the positioning holes and the positioning pins, the winding coil is wound on the framework, the Pin needle is fixed on the framework, one end of the Pin needle is connected with the winding coil, and the other end of the Pin needle is externally connected with a communication channel.

Preferably, a waterproof ring is arranged on the outer side of the upper end of the valve seat.

Preferably, the lower end surface of the cup bearing is provided with a circle of grooves with triangular sections.

Compared with the prior art, the utility model has the beneficial effects that:

1. the valve needle spring is used as a descending buffer, so that the valve needle is prevented from suddenly stopping when encountering a lower stroke limit during valve closing movement, a larger inertia force is generated, threads are combined and killed, and the axial force of the structure is too large, so that the situation that the valve cannot be opened is generated. Simultaneously, the bush is line contact with the valve needle cover, and this kind of contact mode can effectual compensation part structure's axiality, plays the guide effect simultaneously and returns positive effect, leaks O type circle in the valve needle and mainly plays sealed and guide positive effect, prevents that liquid from taking place interior hourglass through the clearance of bush and valve needle cover and valve needle.

2. The cup type bearing is adopted as a screw rod rotating bearing in the end cover assembly, the cup type bearing can play a certain role in fixed guide compensation, good coaxiality of parts after assembly is guaranteed, the parts are not prone to being clamped, friction force in the rotating process of the magnetic rotor is reduced, transmission efficiency of the screw rod is improved, and meanwhile the service life of the valve is prolonged.

3. Fluid medium can enter the upper cavity of the valve body through the position of the valve needle, the fluid medium can fill the upper cavity of the whole valve seat assembly, and the fluid medium cannot leak, so that the pressure difference between the upper side and the lower side of the valve needle is reduced, the movement resistance of the valve needle is reduced, the low-pressure section is maintained at a fluid outlet, the pressure balance of the upper end and the lower end of the valve needle of the electronic expansion valve is facilitated, and the energy consumption is reduced.

4. On connecting rand connection stator shell, with stator shell electric connection, the other end is fixed on the valve body to realized stator shell's ground connection, avoided static and magnetic field interference control signal's transmission and feedback, avoided disturbing stator module's operation, and realized with the fixed connection of valve body and with the positioning connection of valve base, simple structure, simple to operate.

5. The structure integrated level is high, and the part is few, and the equipment is more convenient, is favorable to the lightweight, and the cost is more advantageous.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective exploded view of the present invention;

FIG. 3 is an exploded view of the stator assembly of the present invention;

FIG. 4 is a front view, half section, block diagram of the valve seat assembly of the present invention;

FIG. 5 is a cross-sectional structural view of the end cap assembly of the present invention;

FIG. 6 is a perspective view of the lead screw assembly of the present invention;

figure 7 is a perspective block diagram of the valve pin sleeve assembly of the present invention;

figure 8 is a front view, half section, block diagram of the valve pin sleeve assembly of the present invention;

figure 9 is a perspective block diagram of the valve pin assembly of the present invention;

figure 10 is a front half section view of the valve pin assembly of the present invention;

FIG. 11 is a front view, half cross-sectional view of the lower portion of the valve seat assembly of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-11, the present invention provides an electronic expansion valve with a buffering effect, which comprises a stator assembly 1 and a valve seat assembly 3, wherein the valve seat assembly 3 is installed at the lower portion of the stator assembly 1, the stator assembly 1 comprises a housing 11 and a stator assembly 12 arranged in the housing 11, the valve seat assembly 3 comprises an end cover assembly 31, a magnetism isolating pipe 34, a valve needle assembly 38 and a valve seat assembly 310, the magnetism isolating pipe 34 is arranged at the upper end of the valve seat assembly 310 and inserted into the stator assembly 1, a screw rod assembly 35 is arranged inside the magnetism isolating pipe 34, the end cover assembly 31 is arranged at the upper end of the magnetism isolating pipe 34 and comprises an end cover 311, a cup-shaped bearing 312 and a spring pressing sheet 313, the spring pressing sheet 313 fixes the cup-shaped bearing 312 in a cup-shaped inner cavity a in the middle of the end cover 311, the upper end of the screw rod 353 is inserted into the cup-shaped bearing 312, a flexible graphite gasket 33 is arranged between the lower end of the cup bearing 312 and the screw rod assembly 35, the needle assembly 38 comprises a needle 381 and a needle spring 383 arranged in a lower end inner bore of the needle 381, the lower end of the valve needle 381 is inserted and provided with a valve needle 389, the middle part of the valve needle 389 is provided with a balance flow passage, a bush 386 is sleeved on the outer side of the upper part of the valve needle head 389, the bush 386 is propped against one end of a valve needle spring 383, the lower end of the bushing 386 is provided with a sealing guide sleeve 387, a valve needle inner leakage O-shaped ring 388 is arranged between the inner side of the sealing guide sleeve 387 and a valve needle head 389, the screw 353 in the screw assembly 35 is axially inserted into the central threaded through hole of the valve needle 381, a thread gap is reserved between the screw rod 353 and the valve needle 381, and the flexible graphite gasket 33 plays an axial buffering role to prevent the valve from axially combining in the operation process.

The cup bearing 312 is machined from brass, and because the brass has good self-lubricating performance, good wear resistance, good mechanical property and good cutting processability, the cup bearing 312 plays a role in fixing, guiding and compensating, and ensures good coaxiality of parts after assembly, a circle of groove b with a triangular cross section is formed in the lower end face of the cup bearing 312, so that lubricating oil can conveniently enter an assembly gap with the upper wear-resisting ring 32 along the groove b, and better lubrication is facilitated.

The outer side of the valve needle 381 is provided with a sealing structure which comprises a main sealing ring 384 and an O-shaped ring 385 arranged on the outer side of the main sealing ring 384, a pressing ring 382 is axially arranged on the upper side of the main sealing ring 384, and sliding blocks 381a embedded into a limiting groove 372a are arranged on two sides of the upper portion of the valve needle 381.

The valve needle spring 383 plays a buffering role, and prevents the valve needle from suddenly stopping when encountering a lower stroke limit during valve closing movement to generate larger inertia force, so that threads are combined to be dead, and the axial force of a part structure is too large, thereby preventing the valve from being opened. The main sealing ring 384 is matched with the O-shaped ring 385 to form dynamic sealing, sealing performance is improved, inner leakage in the valve body is prevented, and the main sealing ring 384 is in interference fit with the valve needle 381. The valve needle inner leakage O-shaped ring 388 mainly plays a role in sealing and guiding, liquid is prevented from leaking in the gap between the lining 386 and the sealing guide sleeve 387 and the valve needle 381, and meanwhile, the valve needle inner leakage O-shaped ring 388 is made of flexible materials, so that the guide effect and the coaxiality of a compensation part structure can be achieved. The contact between the bushing 386 and the sealing guide sleeve 387 is line contact, and the contact mode can effectively compensate the coaxiality of the part structure and simultaneously play a role in guiding and correcting.

The lead screw assembly 35 comprises an upper wear-resistant ring 32, a lower wear-resistant ring 36, a magnetic rotor support frame 351, a magnetic rotor 352 and a lead screw 353, wherein the magnetic rotor support frame 351 is injection-molded on the lead screw 353, the injection-molded material is PPS + 40% GF, the magnetic rotor 352 is bonded on the magnetic rotor support frame 351, the bonding material is neodymium iron boron (Nd2Fe14B), clamping grooves are formed in the upper portion and the lower portion of the magnetic rotor support frame 351, clamping claws of the upper wear-resistant ring 32 and the lower wear-resistant ring 36 are clamped in the corresponding clamping grooves, fixing is facilitated, the upper wear-resistant ring 32 and the lower wear-resistant ring 36 are both made of SUS304, PHT spraying treatment is carried out on the SUS 32 and the clamp claws of the lower wear-resistant ring 36, the wear resistance of the SUS is enhanced, and the corrosion resistance of the SUS is not affected.

The inside of valve seat subassembly 310 be provided with needle cover subassembly 37, needle cover subassembly 37 include ball bearing 371 and needle cover 372, ball bearing 371 pack into the indent step department of needle cover 372, ball bearing 371 takes off the frictional force that reduces in the power transmission of lead screw 353 and improves the transmission efficiency of lead screw.

The upper end of needle cover 372 be located the bead department of indent step and have a riveting closing part that rises soon to axial fixity ball bearing 371 makes it can not break away from needle cover 372, the both sides of needle cover 372 open and have twice spacing groove 372a, the upper end of needle 381 stretch into spacing groove 372a and carry out the axial sliding, radial fixed needle makes needle 381 only carry out axial motion, has also injectd the distance that needle 381 moved simultaneously, open the bottom of needle cover 372 has the ring channel for place the blotter.

The valve seat assembly 310 is composed of a valve seat 3101 and a valve base 3102, the valve base 3102 is arranged at the lower end of the valve seat 3101, the valve seat 3101 and the valve base 3102 are welded in a girth mode, and the upper end of the valve seat 3101 is welded and connected with the magnetism isolating pipe 34.

It should be noted that: should leak O type circle 388 in the needle earlier when the installation needle pack into the O type circle ditch inslot of sealed guide pin bushing 387, O type circle ditch inslot edge all is the fillet on the sealed guide pin bushing 387, leaks the packing into of O type circle 388 in the convenient needle, prevents simultaneously that leak O type circle 388 in the needle from producing mechanical damage. Bushing 386 and valve needle head 389 are installed in place and the bushing 386 and valve needle head 389 are girth welded. And then, performing girth welding on the valve needle 381 and the sealing guide sleeve 387, wherein the valve needle spring 383 is pre-stressed at the moment, and the bush 386 is contacted with the sealing guide sleeve 387 by the pre-stress of the valve needle spring 383 to form a line seal. The downward movement limit of the valve needle 381 when moving downward is not the contact surface limit of the lower surface of the valve needle 381 and the upper surface of the pressing ring 382, but the contact surface limit of the lower surface of the sealing guide sleeve 387 and the upper surface of the valve needle head 389. The valve needle sleeve assembly 37 and the valve seat assembly 310 are tightly fitted and pressed into the back girth welding, and it should be noted that the sliding block 381a on the valve needle 381 needs to be embedded into the limiting groove 372a of the valve needle sleeve assembly 37. The valve needle assembly 38 is in threaded connection with the lead screw assembly 35. The magnetism isolating pipe 34 is tightly matched with the valve seat assembly 310 and the end cover assembly 31, the joint of the valve seat assembly 310 and the magnetism isolating pipe 32 and the joint of the end cover assembly 31 and the magnetism isolating pipe 32 need to be subjected to angle cleaning treatment, and the magnetism isolating pipe is welded with the valve seat assembly 310 and the end cover assembly 31 in a girth welding mode. The stator assembly 1 is connected with the connecting clamping ring 2 through hot rivet welding, and the lower part of the stator shell 11 is provided with a pressure point. The valve seat assembly 3 is connected to the valve body by threads on the valve seat 3101 of the valve seat assembly 310. The stator assembly 1 is connected with the valve body through a connecting clamping ring 2 and pressed on the valve seat assembly 3.

Preferably, the stator assembly 1 is composed of a housing 11 and a stator assembly 12, the stator assembly 12 is composed of a stator housing 121, a winding coil 122, a framework 123, an electromagnetic pole plate 124 and a Pin needle 125, the stator housing 121 and the electromagnetic pole plate 124 are provided with positioning holes, the framework 123 is provided with positioning pins, the stator housing 121, the electromagnetic pole plate 124 and the framework 123 are connected in an inserting manner through the positioning holes and the positioning pins, the winding coil 122 is wound on the framework 123, the Pin needle 125 is fixed on the framework 123, one end of the Pin needle 125 is connected with the winding coil 122, and the other end of the Pin needle is externally connected with a communication channel, so that the winding coil is electrically connected with an external signal. The housing 11 is an injection moulded piece of plastics material. To protect the stator assembly, the stator assembly 12 is encapsulated and the encapsulating material outside the stator assembly 12 is TSG-30/4W.

In addition, a waterproof ring 39 is arranged on the outer side of the upper end of the valve seat 3101, so that the installation tightness is ensured.

The working principle is as follows: before the electronic expansion valve starts to work, a fluid medium flows through a balance flow channel at the lower end of the valve needle 381 and then enters an upper cavity of the valve body through a thread clearance, the upper cavity of the whole valve seat assembly 3 is filled with the fluid medium due to the existence of the magnetism isolating pipe 34, so that the pressure difference between the upper side and the lower side of the valve needle 381 is reduced, the movement resistance of the valve needle 381 is reduced, and the fluid medium cannot leak outwards due to the existence of the main sealing ring 384 and the O-shaped ring 385.

When the electronic expansion valve starts to work, the liquid high-pressure fluid medium is throttled by the valve port, so that the pressure of the high-pressure fluid medium is reduced, the high-pressure fluid medium is changed into a gas-liquid mixed fluid medium, and heat is released at the same time. The temperature-pressure sensor at the outlet end can input the collected temperature signal and pressure signal into the controller, the controller outputs the signal to the electronic expansion valve after calculation according to the related control program, the current in the winding coil 122 in the stator assembly 12 is controlled to change, so that the stator assembly 12 is controlled to generate a changed excitation magnetic field, the magnetic rotor 352 rotates under the action of the excitation magnetic field, so that the screw rod assembly 35 is driven to move, the valve needle assembly 38 is further driven to move through thread transmission, the opening change of the valve port of the electronic expansion valve is realized, and the purpose of adjusting the flow and the pressure of the fluid medium is further achieved.

While the utility model has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.

Claims

1. An electronic expansion valve with a buffering effect comprises a stator assembly (1) and a valve seat assembly (3), wherein the valve seat assembly (3) is installed at the lower part of the stator assembly (1), the stator assembly (1) comprises a shell (11) and a stator assembly (12) arranged in the shell (11), and the electronic expansion valve is characterized in that the valve seat assembly (3) comprises an end cover assembly (31), a magnetism isolating pipe (34), a valve needle assembly (38), a valve seat assembly (310) and a valve needle sleeve assembly (37) positioned on the upper side of the valve seat assembly (310), the magnetism isolating pipe (34) is arranged at the upper end of the valve seat assembly (310) and inserted into the stator assembly (1), a screw rod assembly (35) is arranged inside the magnetism isolating pipe (34), the end cover assembly (31) is positioned at the upper end of the magnetism isolating pipe (34) and consists of an end cover (311), a cup-shaped bearing (312) and a spring pressing sheet (313), the spring pressing sheet (313) fixes the cup type bearing (312) in the cup type inner cavity (a) in the middle of the end cover (311), the upper end of the screw rod (353) is inserted into the cup type bearing (312), a flexible graphite gasket (33) is installed between the lower end of the cup type bearing (312) and the screw rod assembly (35), the valve needle assembly (38) comprises a valve needle (381) and a valve needle spring (383) arranged in an inner hole at the lower end of the valve needle (381), the lower end of the valve needle (381) is inserted and provided with a valve needle (389), a balance flow passage is formed in the middle of the valve needle (389), a lining (386) is sleeved on the outer side of the upper part of the valve needle (389), the lining (386) is propped against one end of the valve needle spring (383), a sealing guide sleeve (386) is arranged at the lower end of the lining (386), and an inner leakage O-shaped ring (388) is installed between the inner side of the sealing guide sleeve (387) and the valve needle guide sleeve (389), a screw rod (353) in the screw rod assembly (35) is axially inserted into a central threaded through hole of the valve needle (381), and a threaded gap is reserved between the screw rod (353) and the valve needle (381).

2. An electronic expansion valve with a cushioning effect according to claim 1, wherein: the lead screw subassembly (35) constitute including last wear ring (32), lower wear ring (36), magnetic rotor support frame (351), magnetic rotor (352) and lead screw (353), wherein magnetic rotor support frame (351) mould plastics on lead screw (353), magnetic rotor (352) bond on magnetic rotor support frame (351), magnetic rotor support frame (351) all be provided with the draw-in groove from top to bottom, the jack catch card of last wear ring (32) and lower wear ring (36) in corresponding draw-in groove.

3. An electronic expansion valve with a cushioning effect according to claim 1, wherein: the valve needle sleeve assembly (37) comprises a ball bearing (371) and a valve needle sleeve (372), wherein the ball bearing (371) is installed at the concave step of the valve needle sleeve (372).

4. An electronic expansion valve with a cushioning effect according to claim 3, wherein: the upper end of valve needle cover (372) be located the bead department of indent step and have a high riveting closing-in portion soon to axial fixity ball bearing (371), the both sides of valve needle cover (372) open and have twice spacing groove (372a), the upper end of valve needle (381) stretch into spacing groove (372a) and carry out the endwise slip.

5. An electronic expansion valve with a cushioning effect according to claim 4, wherein: the outside of needle (381) be provided with seal structure, seal structure for main sealing ring (384) and set up O type circle (385) in main sealing ring (384) outside, the upside axial of main sealing ring (384) be provided with clamping ring (382), needle (381) upper portion both sides be provided with slider (381a) of embedding in spacing groove (372 a).

6. An electronic expansion valve with a cushioning effect according to claim 1, wherein: the valve seat assembly (310) is composed of a valve seat (3101) and a valve base (3102), the valve base (3102) is arranged at the lower end of the valve seat (3101), and the upper end of the valve seat (3101) is connected with the magnetism isolating pipe (34) in a welding mode.

7. An electronic expansion valve with a cushioning effect according to claim 1, wherein: the stator assembly (1) is composed of a shell (11) and a stator assembly (12), the stator assembly (12) is composed of a stator shell (121), a winding coil (122), a framework (123), an electromagnetic pole plate (124) and a Pin needle (125), positioning holes are formed in the stator shell (121) and the electromagnetic pole plate (124), positioning pins are arranged on the framework (123), the stator shell (121) and the electromagnetic pole plate (124) are connected with the framework (123) in a plugging mode through the positioning holes and the positioning pins, the winding coil (122) is wound on the framework (123), the Pin needle (125) is fixed on the framework (123), one end of the Pin needle (125) is connected with the winding coil (122), and the other end of the Pin needle is externally connected with a communication channel.

8. An electronic expansion valve with a cushioning effect according to claim 6, wherein: and a waterproof ring (39) is arranged on the outer side of the upper end of the valve seat (3101).

9. An electronic expansion valve with a cushioning effect according to claim 2, wherein: the lower end surface of the cup-shaped bearing (312) is provided with a circle of groove (b) with a triangular section.