CN211010079U - Electronic expansion valve and air conditioning system - Google Patents

Abstract

The utility model relates to a refrigeration plant technical field provides an electronic expansion valve, including screw rod, nut seat and valve core case, the nut seat has the first end and the second end of carrying on the back the body and setting up mutually, the first pot head of nut seat is established the screw rod and with screw rod screw-thread fit, the valve core case is worn to establish the second end and the location of nut seat the nut seat. The utility model provides an electronic expansion valve has saved this subassembly of the guide sleeve that is indispensable among the prior art, has reduced processing and assembly step, can improve the axiality between nut seat and the valve port, reduces the defective rate, the cost of reduction in production and assembly.

Description

Electronic expansion valve and air conditioning system

Technical Field

The utility model relates to a refrigeration plant technical field especially relates to an electronic expansion valve and use this electronic expansion valve's air conditioning system.

Background

The electronic expansion valve opens or closes a valve port arranged on the valve body through the movement of the valve needle component in the guide sleeve and the nut seat, thereby realizing the purposes of flow regulation, throttling and pressure reduction and being widely applied in the technical field of refrigeration equipment. The existing electronic expansion valve usually needs to guide and connect two ends of a guide sleeve with a nut seat and a valve core seat respectively, so as to control the coaxiality of a valve port in the valve core seat and the nut seat. The four components of the screw rod, the nut seat, the valve core seat and the guide sleeve are required to be matched with each other, the four components are difficult to assemble with high precision, the coaxiality between the nut seat and the valve port is difficult to guarantee, and the electronic expansion valve is easy to break down in the using process, so that the aim of improving the performance of the electronic expansion valve is achieved by reducing the number of the components.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an improved electronic expansion valve, which can improve the coaxiality between the nut seat and the valve port and prolong the service life of the electronic expansion valve.

The utility model provides an electronic expansion valve, including screw rod, nut seat and valve core case, the nut seat has the first end and the second end that carry on the back mutually and set up and integrated into one piece, the first pot head of nut seat is established the screw rod and with screw rod screw-thread fit, the valve core case is worn to establish the second end and the location of nut seat the nut seat.

In an embodiment of the present invention, the second end of the nut seat and the valve core seat are in a transition fit or an interference fit.

In an embodiment of the present invention, the electronic expansion valve further includes a spring sleeve, the nut seat further includes a connecting section disposed between the first end and the second end, and the connecting section of the nut seat is sleeved with and guided by the spring sleeve.

In an embodiment of the present invention, the nut seat is made of plastic.

In an embodiment of the present invention, the connection section is provided with at least two bypass holes.

In an embodiment of the present invention, the total sectional area of the plurality of bypass holes is more than four times the sectional area of the valve port.

In an embodiment of the present invention, the number of the bypass holes is at least four, four the bypass holes are uniformly arranged in an annular shape along the circumferential direction of the nut seat.

The utility model discloses an in an embodiment, electronic expansion valve still includes the valve body, installs sleeve pipe and stator module and rotor subassembly on the valve body, the rotor subassembly install in the cover intraductally and connect in the screw rod, stator module acts on the rotor subassembly can drive the rotor subassembly rotates, the rotor subassembly drives the screw rod and rotates, makes the screw rod reciprocate in the nut seat in order to open or close the valve core seat, valve core seat lower extreme fixed mounting is on the valve body, and the upper end extends and gets into in the second end of nut seat.

The utility model discloses an in the embodiment, electronic expansion valve still includes the needle subassembly, the needle subassembly set up in between screw rod and the valve core case, the valve port has been seted up on the valve core case, the needle subassembly can the flexible sliding of axis direction along the nut case under screw rod assembly's the drive and switching the valve port.

The utility model also provides an air conditioning system, air conditioning system includes electronic expansion valve, electronic expansion valve is the arbitrary one of the aforesaid electronic expansion valve.

The utility model provides an electronic expansion valve has saved this subassembly of the guide sleeve that is indispensable among the prior art, has reduced processing and assembly step, can improve the axiality between nut seat and the valve port, reduces the product defective rate, reduces the cost of production and assembly simultaneously.

Drawings

Fig. 1 is a schematic structural view of the electronic expansion valve of the present invention.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a partially enlarged view of a portion B in fig. 1.

Fig. 4 is a schematic structural diagram of a nut seat in an electronic expansion valve.

100. An electronic expansion valve; 10. a valve body; 20. a valve needle assembly; 30. a screw; 40. a nut seat; 50. a rotor assembly; 60. a sleeve; 101. a medium inlet pipe; 102. a medium outlet pipe; 103. an axis; 11. a valve port; 12. a valve cavity; 13. a valve core seat; 14. connecting sheets; 15. fixing the disc; 151. mounting holes; 21. an elastic member; 22. a spring housing; 23. a valve needle; 24. a first spring seat; 25. a second spring seat; 41. a first end; 42. a second end; 43. a bypass orifice; 44. a stop table; 45. a connecting section; 51. a rotor; 52. an adapter plate; 53. a limiting member; 54. a guide piece; 531. a guide spring; 532. a stop ring; 531a, a stopper.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic expansion valve 100 according to an embodiment of the present invention, in which the electronic expansion valve 100 is used for adjusting a flow rate and a pressure of a fluid medium.

In the present embodiment, the electronic expansion valve 100 is applied to an air conditioning system, and the fluid medium flowing through the electronic expansion valve 100 is a refrigerant for performing heat and cold exchange in the air conditioning system. At this time, the electronic expansion valve 100 is installed at an inlet of an evaporator of the air conditioning system, and the electronic expansion valve 100 serves as a boundary element between a high-pressure side and a low-pressure side of the air conditioning system to throttle and depressurize the high-pressure liquid refrigerant, so that the dosage of the liquid refrigerant entering the evaporator is adjusted and controlled, and the dosage of the liquid refrigerant can meet the requirement of an external refrigeration load.

It is understood that in other embodiments, the electronic expansion valve 100 may also be applied to other types of refrigeration equipment besides an air conditioning system, and the fluid medium flowing through the electronic expansion valve 100 may also be other than refrigerant as long as the electronic expansion valve 100 can achieve throttling and pressure reduction of the fluid medium.

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of an improved electronic expansion valve 100 according to the present invention, fig. 2 is a partial enlarged view of a portion a in fig. 1, fig. 3 is a partial enlarged view of a portion B in fig. 1, and fig. 4 is a schematic structural diagram of a nut seat 40 in the electronic expansion valve 100.

The electronic expansion valve 100 includes a valve body 10, a valve needle assembly 20, a screw 30, a nut seat 40, a rotor assembly 50, a stator assembly (not shown) and a sleeve 60, wherein the valve needle assembly 20, the screw 30, the nut seat 40 and the sleeve 60 are mounted on the valve body 10, one end of the screw 30 is connected with the valve needle assembly 20, the other end is connected with the rotor assembly 50, and the stator assembly is disposed on the sleeve 60. The valve body 10 is used for carrying a valve needle assembly 20, a screw 30, a nut seat 40 and a sleeve 60, the valve needle assembly 20 is used for controlling the opening or closing of the electronic expansion valve 100, the screw 30 is used for driving the valve needle assembly 20 to move, the sleeve 60 isolates the external environment from the valve needle assembly 20, the screw 30, the nut seat 40 and the rotor assembly 50, thereby protecting the valve needle assembly 20, the screw 30, the nut seat 40 and the rotor assembly 50 from medium leakage, the rotor assembly 50 is used for driving the screw 30 to move, and the stator assembly is used for driving the rotor assembly 50 to move.

The stator assembly is powered on to generate a magnetic field, the rotor assembly 50 is driven to rotate by the action of the magnetic field force, the rotor assembly 50 drives the screw 30 to move, and the valve needle assembly 20 is driven by the screw 30 to control the electronic expansion valve 100 to open or close, so that the purpose of adjusting the flow and pressure of the fluid medium by the electronic expansion valve 100 is fulfilled.

A medium inlet pipe 101 and a medium outlet pipe 102 are respectively connected to both sides of the valve body 10, and a medium fluid enters the electronic expansion valve 100 through the medium inlet pipe 101 and then flows out of the electronic expansion valve 100 through the medium outlet pipe 102.

The valve body 10 is provided with a valve port 11 and a valve cavity 12 along an axis 103 thereof, the valve port 11 and the valve cavity 12 are communicated with each other along the axis 103, the valve body 10 is provided with a valve core seat 13 therein, and the valve body 10 is further provided with a connecting sheet 14 and a fixed disc 15 thereon.

In the present embodiment, the valve body 10 is formed of a stainless steel material, and the valve body 10 has a substantially cylindrical shape. It is understood that in other embodiments, the valve body 10 may be made of other materials, not listed here, and the valve body 10 may have other shapes than a cylinder.

The valve port 11 is communicated with the medium inlet pipe 101, and the valve port 11 is used for the valve needle assembly 20 to extend into, thereby blocking the fluid medium in the electronic expansion valve 100 from being discharged out through the valve port 11. When the valve needle assembly 20 closes the valve port 11, that is, the valve port 11 is disconnected from the valve cavity 12, the electronic expansion valve 100 is closed; when the valve needle assembly 20 releases the seal of the valve port 11, that is, the valve port 11 and the valve chamber 12 communicate with each other, the electronic expansion valve 100 is opened.

The valve cavity 12 is used for accommodating a part of the valve needle assembly 20, and a fluid medium flows in from the medium inlet pipe 101, passes through the valve cavity 12, is stored in the valve cavity 12 if the valve needle assembly 20 is closed, and flows into the valve port 11 if the valve needle assembly 20 is opened, then flows into the medium outlet pipe 102 from the valve port 11, and finally flows out of the electronic expansion valve 100.

The valve core seat 13 is disposed in the valve body 10, a valve port 11 is disposed in the middle of the valve core seat 13, and the valve needle assembly 20 correspondingly opens and closes the electronic expansion valve 100 by opening and closing the valve port 11.

The connecting piece 14 is disposed on the valve body 10 to fix the nut seat 40, so as to ensure that the nut is prevented from shaking when the rotor assembly 50 drives the screw 30 to move up and down, and the axis 103 of the nut deviates from the axis 103 of the valve needle assembly 20, so that the axis of the screw 30 deviates from the axis of the valve needle assembly 20, which causes a failure of the electronic expansion valve 100 during use.

The fixed disk 15 is disposed on the valve body 10 for supporting and fixing the stator assembly, the fixed disk 15 is further provided with a plurality of mounting holes 151, and the mounting holes 151 are used for fixing the stator assembly on the fixed disk 15.

The valve needle assembly 20 comprises a valve needle 23, said valve needle 23 being mounted at the valve port 11. The valve needle 23 has an axis 103, the axis 103 of the valve needle 23 being arranged coincident with the axis 103 of the valve body 10. One end of the needle 23 is connected to the screw 30 and the other end is engaged with the valve port 11. The screw 30 drives the valve needle 23 to move to control the opening or closing of the valve port 11, thereby implementing the opening/closing of the electronic expansion valve 100.

The valve needle assembly 20 further comprises an elastic member 21, a spring sleeve 22, a first spring seat 24 and a second spring seat 25, wherein the elastic member 21 is arranged between the screw 30 and the valve needle 23 and is used for driving the valve needle 23 to move and playing a role in damping the valve needle 23; the spring sleeve 22 is sleeved on the inner side of the nut seat 40, and the spring sleeve 22 is guided by the inner wall of the nut seat 40; first spring seat 24 and second spring seat 25 have played the effect of fixed elastic component 21 in the axial, and elastic component 21 is located between first spring seat 24 and the second spring seat 25 to elastic component 21 can not drop from between first spring seat 24 and the second spring seat 25, and second spring seat 25 supports with needle 23 and leans on, and both also can set up as an organic whole.

When the screw 30 moves downward, the screw 30 applies pressure to the elastic element 21, the elastic element 21 transmits the pressure to the valve needle 23, the valve needle 23 blocks the valve port 11, and the electronic expansion valve 100 is in a closed state; conversely, when the screw 30 moves upward, the pressure applied by the elastic member 21 to the valve needle 23 gradually decreases, and the valve needle 23 gradually moves away from the valve port 11, so that the electronic expansion valve 100 is in an open state.

The screw 30 has two opposite ends, wherein one end of the screw 30 is connected to the rotor assembly 50, and the other end of the screw 30 penetrates through the nut seat 40 and is connected to the first spring seat 24.

The nut seat 40 is arranged inside the sleeve 60, and the nut seat 40 is in threaded connection with the screw 30, and since the nut seat 40 is welded on the connecting piece 14, when the screw 30 is driven by the rotor 51 to rotate, due to the screw-rod matching relationship of the nut seat 40 formed between the nut seat 40 and the screw 30, the screw 30 and the rotor assembly 50 fixedly connected with the screw 30, etc. can move telescopically along the axis 103 direction of the screw 30, thereby realizing the movement process of the screw 30 driving the valve needle assembly 20.

The rotor assembly 50 includes a rotor 51 located in a sleeve 60, an adapter plate 52 for mounting the screw 30, a stopper 53 for limiting a rotation angle of the rotor 51, and a guide plate 54 mounted on the adapter plate 52. The rotor 51 is mounted on the adapter plate 52. The adapter plate 52 is fixedly connected with the screw 30 by welding and the like.

The limiting member 53 includes a rail spring 531 sleeved on the nut base 40, and a stop ring 532 installed on the rail spring 531. One end of the rail spring 531 is connected to the connecting piece 14. The other end of the rail spring 531 is provided with a stopper 531 a. The stopper ring 532 is wound around the rail spring 531. Preferably, the nut holder 40 is provided on an outer wall thereof with a stop land 44, and the stop land 44 is engaged with a stop ring 532 to limit a rotation angle of the rotor 51.

During the rotation of the rotor 51 along the axis 103 to drive the screw 30 with the closing of the needle 23, the stop ring 532 moves along the guide spring 531; the stop ring 532 abuts against the stop table 44 to limit the rotation angle of the rotor 51, which is the lower limit of the rotor 51. During the process that the rotor 51 moves along the axis 103 in a rotating manner to drive the screw 30 to drive the valve needle 23 to close the valve port 11, the stop ring 532 moves along the guide spring 531; the stop ring 532 abuts against the stop portion 531a to limit the rotation angle of the rotor 51, which is an upper limit of the rotor 51.

The stator assembly includes a coil and other components, and is configured to generate a magnetic field when energized, and to drive the rotor 51 to rotate under the action of the magnetic field, thereby driving the screw 30 to rotate.

The sleeve 60 is installed on the valve body 10 to protect the valve needle assembly 20, the screw 30, the nut seat 40 and the rotor assembly 50 inside, and prevent the medium from leaking and impurities from entering the valve body 10, thereby achieving the isolation function. In order to further improve the connection stability of the valve body 10 and the sleeve 60, the valve body 10 and the sleeve 60 are fixedly connected with each other by welding. It is understood that in other embodiments, the valve body 10 and the sleeve 60 may be fixedly connected by riveting, gluing, or other connection methods, or detachably connected by screwing.

The working principle of the electronic expansion valve 100 is explained as follows:

the stator assembly generates a magnetic field after being electrified, the rotor 51 made of a magnetic material rotates under the driving of the magnetic field, the rotor 51 is fixedly connected with the screw 30 through the guide sheet 54, the rotation of the rotor 51 drives the screw 30 to rotate, the screw 30 is matched with the nut seat 40 through a screw rod, the nut seat 40 is fixedly arranged on the valve body 10, and therefore the rotation of the screw 30 relative to the nut seat 40 can drive the screw 30 to move relative to the nut seat 40 in a stretching mode, so that the working process that the stator assembly drives the rotor assembly 50 to move, and the rotor assembly 50 drives the screw 30 assembly to move again is realized;

the screw 30 moves in a telescopic manner relative to the axis 103 direction of the valve body 10 and then drives the valve needle 23 to move through the elastic element 21, the valve needle 23 moves towards the valve port 11 formed in the valve body 10 under the driving of the screw 30, and when the valve needle 23 closes the valve port 11, that is, the valve cavity 12 is disconnected from the valve port 11, the electronic expansion valve 100 is closed; when the valve needle 23 releases the closure of the valve port 11, that is, the valve cavity 12 is communicated with the valve port 11, the electronic expansion valve 100 is opened, and the opening aperture of the valve port 11 in the electronic expansion valve 100 is relatively small, so that the flow rate of the fluid medium is reduced, and the throttle and pressure reduction process of the electronic expansion valve 100 on the fluid medium is realized.

The existing electronic expansion valve usually needs to match four components of a screw, a nut seat, a valve core seat and a guide sleeve to ensure the coaxiality between a valve port and the nut seat; however, the four components are difficult to assemble at high precision, the coaxiality between the nut seat and the valve port is difficult to ensure, and the electronic expansion valve is easy to break down in the using process.

The utility model discloses an improve the axiality between nut seat 40 and the valve port 11, design into the functional component that can undertake traditional electronic expansion valve uide bushing simultaneously with nut seat 40 to reduce the component quantity that will need the equipment into three, reduce the equipment degree of difficulty between nut seat, screw rod, the valve core case, improve the axiality between nut seat and the valve port, can also improve compact structure and stability.

Specifically, the nut seat 40 has a first end 41 and a second end 42 which are opposite to each other, the first end 41 of the nut seat 40 is sleeved on the screw rod 30 and is in threaded fit with the screw rod 30, when the screw rod 30 is driven to rotate by the rotor 51, due to the screw rod fit relationship of the nut seat 40 formed between the nut seat 40 and the screw rod 30, the screw rod 30 and the rotor assembly 50 fixedly connected with the screw rod 30 and the like can move in an extending and contracting manner along the axis 103 direction of the screw rod 30, so that the process that the screw rod 30 moves up and down in the nut seat 40 is realized; the valve core seat 13 penetrates through the second end 42 of the nut seat 40, so that the nut seat 40 is guided by the valve core seat 13.

The utility model provides an electronic expansion valve 100 has saved this subassembly of the guide sleeve that is essential among the prior art, has reduced the assembly step between processing and nut seat 40 and the guide sleeve, can improve the axiality between nut seat 40 and the valve port 11, reduces the product defective rate and reduces the cost of production and assembly simultaneously.

In this embodiment, the second end 42 of the nut seat 40 is in transition fit or interference fit with the valve core seat 13 to ensure that the nut seat 40 is tightly fitted with the valve core seat 13, so that the screw 30 is not easily loosened when rotating, and the service life of the electronic expansion valve 100 is prolonged. Preferably, transition fit or interference fit is realized between the second end 42 of the nut seat 40 and the valve core seat 13 by means of press fitting, wherein the press fitting refers to an assembly process of pressing two parts in transition or interference fit to a fit position, and the process is simple and the assembly cost is low.

In this embodiment, the nut seat 40 further includes a connecting section 45 disposed between the first end 41 and the second end 42, and the connecting section 45 of the nut seat 40 is sleeved on and guided to the spring housing 22. The spring sleeve 22 is guided through the interior of the nut seat 40;

in the present embodiment, the second end 42 of the nut seat 40 is provided with a bypass hole 43, the valve port 11, the valve cavity 12, the bypass hole 43, the medium inlet pipe 101 and the medium outlet pipe 102 are communicated with each other, the fluid medium flows in from the medium inlet pipe 101, flows into the valve cavity 12 through the bypass hole 43, and then flows into the valve port 11 from the valve cavity 12 when the valve needle 23 is far away from the valve port 11 to open the valve port 11, and then flows into the medium outlet pipe 102 from the valve port 11, and finally flows out of the electronic expansion valve 100.

Preferably, the number of the bypass holes 43 is at least two, at least two bypass holes 43 can ensure that the electronic expansion valve 100 can be continuously used when one of the bypass holes 43 is blocked, and the like, and the at least two bypass holes 43 can avoid the phenomenon of pressure imbalance when a fluid medium flows in or out through the bypass holes 43 in one of the bypass holes 43, thereby prolonging the service life of the electronic expansion valve 100.

In this embodiment, the total cross-sectional area of the bypass hole 43 is at least four times larger than the cross-sectional area of the valve port 11, so as to prevent a large pressure drop at the bypass hole 43 and generate a large impact force on other components in the valve body 10, thereby ensuring the accuracy and the service life of the electronic expansion valve 100.

In the present embodiment, four bypass holes 43 are provided, and four bypass holes 43 are annularly and uniformly distributed at the second end 42 along the axial direction of the nut seat 40, so as to ensure smooth and uniform flow of the fluid medium in the electronic expansion valve 100.

In this embodiment, nut seat 40 is the plastics material, and bypass hole 43 sets up at the second end 42 of nut seat 40, and bypass hole 43 among the prior art all sets up on the uide bushing of metal material, and the utility model provides a bypass hole 43 directly sets up on the nut seat 40 of plastics material, and the processing cost is low, and it is more convenient to assemble.

It can be understood that, in the present embodiment, the axes 103 of the valve body 10, the nut seat 40 and the spring sleeve 22 coincide to ensure the coaxiality between the valve needle 23 and the valve port 11, so that during the movement, the collision between the valve needle 23 and the valve body 10 is reduced, and further, the wear of the components such as the valve needle 23 is reduced, thereby prolonging the service life of the electronic expansion valve 100.

The utility model provides an electronic expansion valve 100 has saved this subassembly of the guide sleeve that is essential among the prior art, has reduced processing and assembly step, can improve the axiality between nut seat 40 and the valve port 11, reduces the cost of production and assembly.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims (10)

1. The utility model provides an electronic expansion valve (100), includes screw rod (30), nut seat (40) and valve core seat (13), its characterized in that, nut seat (40) have back of the body and set up and integrated into one piece's first end (41) and second end (42), the first end (41) cover of nut seat (40) is established screw rod (30) and with screw rod (30) screw-thread fit, valve core seat (13) are worn to establish second end (42) and the location of nut seat (40).

2. An electronic expansion valve (100) according to claim 1, wherein the second end (42) of the nut seat (40) is in transition fit or interference fit with the valve core seat (13).

3. An electronic expansion valve (100) according to claim 1, wherein the electronic expansion valve (100) further comprises a spring housing (22), the nut base further comprises a connecting section (45) disposed between the first end (41) and the second end (42), and the connecting section (45) of the nut base (40) is sleeved on and guided by the spring housing (22).

4. An electronic expansion valve (100) according to claim 1, wherein the nut base (40) is made of plastic.

5. An electronic expansion valve (100) according to claim 3, wherein the connecting section (45) is provided with at least two bypass holes (43), and the number of the bypass holes (43) is at least two.

6. An electronic expansion valve (100) according to claim 5, wherein the total cross-sectional area of the plurality of bypass openings (43) is more than four times the cross-sectional area of the valve port (11).

7. An electronic expansion valve (100) according to claim 5, wherein the number of the bypass holes (43) is at least four, and four bypass holes (43) are uniformly arranged in a ring shape along the circumferential direction of the nut base (40).

8. An electronic expansion valve (100) according to claim 1, wherein the electronic expansion valve (100) further comprises a valve body (10), a sleeve (60) mounted on the valve body (10), and a stator assembly and a rotor assembly (50), the rotor assembly (50) is mounted in the sleeve (60) and connected to the screw (30), the stator assembly acts on the rotor assembly (50) and can drive the rotor assembly (50) to rotate, the rotor assembly (50) drives the screw (30) to rotate, so that the screw (30) moves up and down in the nut seat (40) to open or close the valve core seat (13), the lower end of the valve core seat (13) is fixedly mounted on the valve body (10), and the upper end extends into the second end (42) of the nut seat (40).

9. The electronic expansion valve (100) according to claim 8, wherein the electronic expansion valve (100) further comprises a valve needle assembly (20), the valve needle assembly (20) is disposed between the screw (30) and the valve core seat (13), a valve port (11) is formed in the valve core seat (13), and the valve needle assembly (20) can be driven by the screw (30) assembly to slide in an extending manner along an axial direction of the nut seat (40) and open and close the valve port.

10. An air conditioning system comprising an electronic expansion valve (100), characterized in that the electronic expansion valve (100) is an electronic expansion valve (100) according to any of claims 1-9.

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