Electronic expansion valve

Abstract

The electronic expansion valve comprises a rotor assembly, a lead screw, a valve element assembly and a valve seat assembly, and the side wall of the valve seat assembly is provided with a first connector, a second connector, a first valve port and a second valve port. When the rotor assembly drives the valve element assembly to move to a first preset position in the direction close to the rotor assembly through the lead screw, the valve element assembly can close the first valve port, and the second connector communicates with the second valve port. When the rotor assembly drives the valve element assembly to move to a second preset position in the direction away from the rotor assembly through the lead screw, the valve element assembly can close the second valve port, and the first connector communicates with the second connector through the first valve port. When the valve element assembly is located between the first preset position and the second preset position, the first connector, the first valve port, the second connector and the second valve port communicate with one another. According to the electronic expansion valve, the problem that the structure is complex due to the fact that the number of communication modes of the electronic expansion valve is small and the number of valve elements is large is solved.

Description

Technical Field

[0001] The present application relates to the field of valve body technology, and in particular to an electronic expansion valve. Background Art

[0002] As a new type of control element, the electronic expansion valve has already broken through the concept of throttling mechanism. It is an important part of the intelligentization of the refrigeration system, an important means and guarantee for the real realization of the optimization of the refrigeration system, and a symbol of the mechatronics of the refrigeration system. It has been applied in more and more fields.

[0003] Existing electronic expansion valves are usually two-way valves, that is, the electronic expansion valves are connected to the main pipe at one end and the side pipe at one side through the valve opening. In this way, the electronic expansion valves have fewer connection modes and can also achieve fewer functions.

[0004] Furthermore, in order to increase the communication modes of the electronic expansion valve, the existing electronic expansion valve adopts the method of increasing the number of valve cores. However, such a setting greatly increases the structural complexity of the electronic expansion valve, which is not conducive to reducing the volume and manufacturing cost of the electronic expansion valve. Summary of the invention

[0005] Based on this, it is necessary to provide an electronic expansion valve to solve the problem that the electronic expansion valve has fewer communication modes and a larger number of valve cores resulting in a more complex structure.

[0006] The electronic expansion valve provided in the present application includes a rotor assembly, a screw rod, a valve core assembly and a valve seat assembly, the side wall of the valve seat assembly is provided with a first interface and a second interface distributed along its own axial direction, the valve seat assembly is also provided with a first valve port and a second valve port, the first valve port is located between the first interface and the second interface, the second valve port is located on the side of the second interface away from the first interface, the valve core assembly can move relative to the valve seat assembly along the axial direction of the screw rod, one end of the screw rod is fixedly connected to the rotor assembly, and the other end is connected to the valve core assembly. When the rotor assembly drives the valve core assembly to move to a first preset position in a direction close to the rotor assembly through the screw rod, the valve core assembly can close the first valve port, and the second interface is connected to the second valve port. When the rotor assembly drives the valve core assembly to move to a second preset position in a direction away from the rotor assembly through the screw rod, the valve core assembly can close the second valve port, and the first interface is connected to the second interface through the first valve port. When the valve core assembly is between the first preset position and the second preset position, the first interface, the first valve port, the second interface and the second valve port are connected to each other.

[0007] In one embodiment, the flow area of ​​the second valve port is greater than the flow area of ​​the first valve port.

[0008] In one embodiment, a conical first flow regulating surface is provided on the outer peripheral side of the valve core assembly, and the first flow regulating surface is contracted along the direction from the rotor assembly to the second valve port. The first flow regulating surface and the second valve port are movably matched to control the opening size of the second valve port.

[0009] In one embodiment, a conical second flow regulating surface is provided on the outer peripheral side of the valve core assembly, and the second flow regulating surface is expanded along the direction from the rotor assembly to the second valve port. The second flow regulating surface and the first valve port are movably cooperated to control the opening size of the first valve port.

[0010] In one embodiment, the valve core assembly includes a main core body and a throttle member, the throttle member is sleeved on the outer peripheral side of the main core body and is interference fit with the main core body, and the valve core assembly controls the opening and closing of the first valve port through the end of the throttle member close to the rotor assembly, and the valve core assembly controls the opening and closing of the second valve port through the end of the throttle member away from the rotor assembly.

[0011] In one embodiment, the valve seat assembly includes a first valve seat and a second valve seat, the first valve port is arranged at an end of the first valve seat away from the rotor assembly, the second valve seat is connected to an end of the first valve seat away from the rotor assembly and is sleeved on the outside of the first valve port, and the maximum outer diameter of the main core body is smaller than the inner diameter of the first valve port, and the maximum outer diameter of the throttling element is larger than the inner diameter of the first valve port and smaller than the outer diameter of the first valve port.

[0012] In one embodiment, the electronic expansion valve further includes a second elastic sealing ring, which is sandwiched between the main core and the throttling element and is in a compressed state.

[0013] In one of the embodiments, a connecting seam is defined between the main core and the throttling element, an installation cavity connected to the connecting seam is provided between the main core and the throttling element, and the installation cavity separates the connecting seam into a first seam and a second seam, a second elastic sealing member is clamped in the installation cavity and separates the installation cavity to form a first deposition cavity and a second deposition cavity, wherein the first deposition cavity is connected to the first seam, and the second deposition cavity is connected to the second seam.

[0014] In one embodiment, one of the main core and the throttling element is provided with a mounting groove, and the other is sealed at an opening of the mounting groove to form a mounting cavity.

[0015] In one embodiment, the electronic expansion valve also includes a stop seat connected to the valve seat assembly, the stop seat is sleeved on the outside of the screw rod, and the valve core assembly also includes a sliding nut, and the end of the screw rod away from the rotor assembly is threadedly matched with the sliding nut, and the sliding nut and the stop seat or the valve seat assembly are matched through a limiting structure, so that the screw rod can drive the sliding nut to drive the valve core assembly to move relative to the stop seat along the axial direction of the screw rod to open or close the first valve port and the second valve port, and the limiting structure can prevent the sliding nut from rotating around the axis of the screw rod relative to the stop seat.

[0016] In one of the embodiments, a stop protrusion extending along the radial direction of the sliding nut is provided on the circumferential side thereof, and a guide groove extending along the axial direction of the stop seat or valve seat assembly is provided corresponding to the stop protrusion, and the end of the stop protrusion away from the sliding nut extends into the guide groove and can be slidably matched with the guide groove along the axial direction of the stop seat, so that the sliding nut and the stop seat can be slidably matched along the axial direction of the stop seat, and the stop protrusion and the guide groove constitute a limiting structure.

[0017] Compared with the prior art, such an arrangement can drive the valve core assembly through the screw rod to move toward or away from the rotor assembly to respectively control the opening and closing of the first valve port and the second valve port, thereby achieving mutual connection between the three external connecting ports of the first interface, the second interface and the second valve port, that is, realizing the three-way function of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of an electronic expansion valve according to an embodiment of the present application;

[0020] Figure 2 for Figure 1 A partial structural schematic diagram of an electronic expansion valve is shown;

[0021] Figure 3 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0022] Figure 4 for Figure 3 An enlarged view of point A is shown;

[0023] Figure 5 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application;

[0024] Figure 6 A cross-sectional view of an electronic expansion valve according to another embodiment of the present application.

[0025] : Figure numerals: 100, rotor assembly; 200, screw rod; 300, valve core assembly; 310, sliding nut; 311, anti-rotation protrusion; 331, first flow regulating surface; 332, second flow regulating surface; 350, main core body; 351, second elastic sealing ring; 352, assembly ring groove; 360, throttling piece; 371, first joint; 372, second joint; 381, first sedimentation cavity; 382, ​​second sedimentation cavity; 400, valve seat assembly; 420, valve cavity; 431, first interface; 432, second interface; 440, first valve port; 450, second valve port; 460, first valve seat; 470, second valve seat; 510, stop seat; 515, guide groove; 700, valve body assembly; 800, shell; 900, stator assembly. DETAILED DESCRIPTION

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0032] See also Figure 1-Figure 6 The electronic expansion valve includes a rotor assembly 100, a screw rod 200, a valve core assembly 300 and a valve seat assembly 400. The side wall of the valve seat assembly 400 is provided with a first interface 431 and a second interface 432 distributed along its own axial direction. The valve seat assembly 400 is also provided with a first valve port 440 and a second valve port 450. The first valve port 440 is located between the first interface 431 and the second interface 432, and the second valve port 450 is located on the side of the second interface 432 away from the first interface 431. The valve core assembly 300 can move relative to the valve seat assembly 400 along the axial direction of the screw rod 200. One end of the screw rod 200 is fixedly connected to the rotor assembly 100, and the other end is connected to the valve core assembly 300.

[0033] When the rotor assembly 100 drives the valve core assembly 300 to move to the first preset position toward the direction close to the rotor assembly 100 through the screw rod 200, the valve core assembly 300 can close the first valve port 440, and the second interface 432 is connected to the second valve port 450;

[0034] When the rotor assembly 100 drives the valve core assembly 300 to move to the second preset position in a direction away from the rotor assembly 100 through the screw rod 200, the valve core assembly 300 can close the second valve port 450, and the first interface 431 is connected to the second interface 432 through the first valve port 440;

[0035] When the valve core assembly 300 is located between the first preset position and the second preset position, the first interface 431 , the first valve port 440 , the second interface 432 and the second valve port 450 are interconnected.

[0036] It should be noted that the technical solutions regarding the driving method of the electronic expansion valve in the above embodiments can all be applied to this embodiment.

[0037] It should be noted that the first interface 431 and the second interface 432 are respectively used to connect different external pipelines.

[0038] With such arrangement, the valve core assembly 300 can be driven by the screw rod 200 to move toward or away from the rotor assembly 100, so as to control the opening and closing of the first valve port 440 and the second valve port 450 respectively, thereby achieving mutual connection between the three external connecting ports of the first interface 431, the second interface 432 and the second valve port 450, that is, realizing the three-way function of the electronic expansion valve.

[0039] It should be noted that the electronic expansion valve further includes a housing 800 , which is disposed on the outside of the rotor assembly 100 , a portion of the lead screw 200 , and a portion of the valve core assembly 300 and is welded to the valve seat.

[0040] In one embodiment, the screw rod 200 and the valve core assembly 300 are movably threaded.

[0041] In one embodiment, the flow area of ​​the second valve port 450 is greater than the flow area of ​​the first valve port 440 .

[0042] In this way, the second pipe port and the second valve port 450 can be connected to form a large flow regulating valve, and the first pipe port, the first valve port 440 and the second pipe port can be connected to form a small flow regulating valve.

[0043] Specifically, the first valve port 440 and the second valve port 450 are both circular valve ports.

[0044] Furthermore, in one embodiment, a conical first flow regulating surface 331 is provided on the outer peripheral side of the valve core assembly 300, and the first flow regulating surface 331 is contracted along the direction from the rotor assembly 100 to the second valve port 450, and the first flow regulating surface 331 and the second valve port 450 are movably matched to control the opening size of the second valve port 450.

[0045] Specifically, the first flow regulating surface 331 is arranged at one end of the valve core assembly 300 away from the rotor assembly 100. By setting the conical first flow regulating surface 331, when the valve core assembly 300 moves toward the direction close to the rotor assembly 100, the distance between the second valve port 450 and the first flow regulating surface 331 tends to gradually increase. At this time, the opening of the second valve port 450 tends to gradually increase, and smooth adjustment of the opening of the second valve port 450 can be achieved.

[0046] Furthermore, in one embodiment, a conical second flow regulating surface 332 is provided on the outer peripheral side of the valve core assembly 300, and the second flow regulating surface 332 is expanded along the direction from the rotor assembly 100 to the second valve port 450, and the second flow regulating surface 332 and the first valve port 440 are movably cooperated to control the opening size of the first valve port 440.

[0047] Specifically, the second flow regulating surface 332 is arranged on the side of the first flow regulating surface 331 close to the rotor assembly 100. By setting the conical second flow regulating surface 332, when the valve core assembly 300 moves in the direction away from the rotor assembly 100, the distance between the first valve port 440 and the second flow regulating surface 332 tends to gradually increase. At this time, the opening of the first valve port 440 tends to gradually increase, and smooth adjustment of the opening of the first valve port 440 can be achieved.

[0048] It should be noted that the outer peripheral side of the valve core assembly 300 may only be provided with one of the first flow regulating surface 331 and the second flow regulating surface 332. In this case, the electronic expansion valve is equivalent to integrating a regulating valve and a stop valve. Alternatively, the outer peripheral side of the valve core assembly 300 may be provided with both the first flow regulating surface 331 and the second flow regulating surface 332. In this case, the electronic expansion valve is equivalent to integrating two regulating valves. Alternatively, the outer peripheral side of the valve core assembly 300 may be provided with neither the first flow regulating surface 331 nor the second flow regulating surface 332. In this case, the electronic expansion valve is equivalent to integrating two stop valves.

[0049] A sealing component is provided between the outer wall of the valve core component 300 and the inner wall of the valve seat component 400, and the valve core component 300 is sealed and movably matched with the valve seat component 400 through the sealing component. The valve seat component 400 is provided with a valve cavity 420, and the first valve port 440 and the second valve port 450 are both connected to the valve cavity 420 located at one end of the valve seat component 400 close to the rotor component 100. When the valve core component 300 blocks the first valve port 440, the area enclosed by the sealing area between the valve core component 300 and the first valve port 440 is defined as S1; when the valve core component 300 blocks the second valve port 450, the sealing area enclosed by the sealing area between the valve core component 300 and the second valve port 450 is defined as S2; the sealing area enclosed by the valve core component 300 and the valve seat component 400 through the sealing component is defined as S3, S1 = S2 = S3. The sealing area S3 is the area enclosed by the outer wall where the sealing component and the valve seat component 400 fit.

[0050] In this way, it can be ensured that the refrigerant pressures received by the two ends of the valve core assembly 300 along its own axis are equal, so that the valve core is in a force-balanced state.

[0051] In one embodiment, the valve core assembly 300 includes a main core body 350 and a throttle member 360, the throttle member 360 is sleeved on the outer peripheral side of the main core body 350 and is interference fit with the main core body 350, and the valve core assembly 300 controls the opening and closing of the first valve port 440 through the end of the throttle member 360 close to the rotor assembly 100, and the valve core assembly 300 controls the opening and closing of the second valve port 450 through the end of the throttle member 360 away from the rotor assembly 100.

[0052] Specifically, the main core body 350 is a metal part, and the throttle part 360 is an injection molded part, which is helpful to improve the sealing performance of the valve core assembly 300.

[0053] Further, the electronic expansion valve further includes a stop seat 510 connected to the valve seat assembly 400, and the stop seat 510 is sleeved on the outside of the screw rod 200. The valve core assembly 300 further includes a sliding nut 310, and one end of the screw rod 200 away from the rotor assembly 100 is threadedly matched with the sliding nut 310, and the sliding nut 310 and the stop seat 510 (or the valve seat assembly 400) are matched through a limiting structure, so that the screw rod 200 can drive the sliding nut 310 to drive the valve core assembly 300 to move relative to the stop seat 510 along the axial direction of the screw rod 200, so as to open or close the first valve port 440 and the second valve port 450, and the limiting structure can prevent the sliding nut 310 from rotating relative to the stop seat 510 around the axis of the screw rod 200.

[0054] Specifically, the circumferential side of the sliding nut 310 is provided with a rotation-stopping protrusion 311 extending along its radial direction, and the stop seat 510 or the valve seat assembly 400 is provided with a guide groove 515 extending along its axial direction corresponding to the rotation-stopping protrusion 311, and one end of the rotation-stopping protrusion 311 away from the sliding nut 310 extends into the guide groove 515 and can slide and cooperate with the guide groove 515 along the axial direction of the stop seat 510, so that the sliding nut 310 and the stop seat 510 slide and cooperate along the axial direction of the stop seat 510. In addition, the rotation-stopping protrusion 311 and the guide groove 515 constitute a limiting structure.

[0055] Further, in one embodiment, the valve seat assembly 400 includes a first valve seat 460 and a second valve seat 470, the first valve port 440 is provided at one end of the first valve seat 460 away from the rotor assembly 100, the second valve seat 470 is connected to one end of the first valve seat 460 away from the rotor assembly 100 and is sleeved on the outside of the first valve port 440, and the maximum outer diameter of the main core body 350 is smaller than the inner diameter of the first valve port 440, and the maximum outer diameter of the throttle member 360 is larger than the inner diameter of the first valve port 440 and smaller than the outer diameter of the first valve port 440. The inner diameter of the first valve port 440 is the opening diameter of the first valve port 440, and the outer diameter of the first valve port 440 is the inner diameter of the second valve seat 470 sleeved on the outside of the first valve port 440.

[0056] It should be noted that the second valve port 450 is disposed on the second valve seat 470 .

[0057] Since the maximum outer diameter of the throttle 360 ​​is smaller than the outer diameter of the first valve port 440, and the second valve seat 470 is sleeved on the outer side of the first valve port 440, the maximum outer diameter of the throttle 360 ​​is smaller than the inner diameter of the second valve seat 470 sleeved on the outer side of the first valve port 440, but it is still necessary to ensure that the maximum outer diameter of the throttle 360 ​​is larger than the inner diameter of the second valve port 450. The inner diameter of the second valve seat 470 is the opening diameter of the second valve seat 470. The outer diameter of the second valve seat 470 is the inner diameter of the second valve seat 470 sleeved on the outer side of the first valve port 440.

[0058] In view of the fact that the maximum outer diameter of the main core body 350 is greater than the inner diameter of the first valve port 440, it can be known that when assembling the valve core assembly 300 and the valve seat assembly 400, the end of the main core body 350 without the throttle member 360 can be inserted into the first valve seat 460 through the first valve port 440, and then the second valve seat 470 can be synchronously sleeved on the end of the main core body 350 with the throttle member 360 and the outer side of the first valve seat 460. In this way, the assembly difficulty of the valve core assembly 300 and the valve seat assembly 400 is greatly reduced.

[0059] Specifically, the first valve seat 460 may be welded, clamped, bonded or threadedly connected to the second valve seat 470 .

[0060] More specifically, an assembly annular groove 352 is provided on the outer peripheral side of the main core body 350 , and the annular throttling member 360 is pressed into the assembly annular groove 352 by extrusion to achieve the assembly of the main core body 350 and the throttling member 360 .

[0061] But not limited thereto, in another embodiment, the electronic expansion valve further includes a valve body assembly 700 , and the second valve port 450 is disposed in the valve body assembly 700 .

[0062] In one embodiment, the electronic expansion valve further includes a second elastic sealing ring 351 , which is sandwiched between the main core 350 and the throttling member 360 and is in a compressed state.

[0063] In this way, when the main core body 350 and the throttling member 360 become loose and a gap is generated, the second elastic sealing ring 351 can seal the gap between the main core body 350 and the throttling member 360 through its own elastic deformation to prevent the valve core assembly 300 from leaking.

[0064] Specifically, the second elastic sealing member is a rubber member or a silicone member.

[0065] Furthermore, in one embodiment, a connecting seam is defined between the main core 350 and the throttling member 360, and an installation cavity connecting the connecting seam is provided between the main core 350 and the throttling member 360, and the installation cavity separates the connecting seam into a first seam 371 and a second seam 372, and a second elastic sealing member is clamped in the installation cavity and separates the installation cavity to form a first deposition cavity 381 and a second deposition cavity 382, ​​wherein the first deposition cavity 381 is connected to the first seam 371, and the second deposition cavity 382 is connected to the second seam 372.

[0066] In this way, the leaked refrigerant can be respectively contained in the first deposition chamber 381 and the second deposition chamber 382, ​​but will not flow between the first deposition chamber 381 and the second deposition chamber 382. In addition, the refrigerant deposited in the first deposition chamber 381 can also be discharged from the installation chamber through the first joint 371, and the refrigerant deposited in the second deposition chamber 382 can also be discharged from the installation chamber through the second joint 372.

[0067] Specifically, in one embodiment, one of the main core 350 and the throttle member 360 is provided with a mounting groove, and the other is sealed at the opening of the mounting groove to form a mounting cavity.

[0068] Alternatively, in other embodiments, both the main core 350 and the throttle member 360 are provided with mounting grooves, and the two mounting grooves are connected to form a mounting cavity.

[0069] The electronic expansion valve further includes a stator assembly 900 , which is sleeved on the outer side of the housing 800 , and the stator assembly 900 can drive the rotor assembly 100 to rotate.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. An electronic expansion valve, It is characterized in that The invention comprises a rotor assembly (100), a screw rod (200), a valve core assembly (300) and a valve seat assembly (400); the side wall of the valve seat assembly (400) is provided with a first interface (431) and a second interface (432) distributed along the axial direction thereof; the valve seat assembly (400) is further provided with a first valve port (440) and a second valve port (450); the first valve port (440) is located between the first interface (431) and the second interface (432); the second valve port (450) is located on a side of the second interface (432) away from the first interface (431); the valve core assembly (300) is capable of moving relative to the valve seat assembly (400) along the axial direction of the screw rod (200); one end of the screw rod (200) is fixedly connected to the rotor assembly (100), and the other end is connected to the valve core assembly (300); When the rotor assembly (100) drives the valve core assembly (300) to move to a first preset position in a direction close to the rotor assembly (100) through the screw rod (200), the valve core assembly (300) is able to close the first valve port (440), and the second interface (432) is connected to the second valve port (450); When the rotor assembly (100) drives the valve core assembly (300) to move to a second preset position in a direction away from the rotor assembly (100) via the screw rod (200), the valve core assembly (300) is capable of closing the second valve port (450), and the first interface (431) is connected to the second interface (432) via the first valve port (440); When the valve core assembly (300) is located between the first preset position and the second preset position, the first interface (431), the first valve port (440), the second interface (432) and the second valve port (450) are interconnected.

2. The electronic expansion valve according to claim 1, It is characterized in that The flow area of ​​the second valve port (450) is greater than the flow area of ​​the first valve port (440).

3. The electronic expansion valve according to claim 1, It is characterized in that A conical first flow regulating surface (331) is provided on the outer peripheral side of the valve core assembly (300), and along the direction from the rotor assembly (100) to the second valve port (450), the first flow regulating surface (331) is in a contraction shape, and the first flow regulating surface (331) and the second valve port (450) are movably matched to control the opening size of the second valve port (450).

4. The electronic expansion valve according to claim 1 or 3, It is characterized in that A conical second flow regulating surface (332) is provided on the outer peripheral side of the valve core assembly (300), and the second flow regulating surface (332) is expanded along the direction from the rotor assembly (100) to the second valve port (450), and the second flow regulating surface (332) and the first valve port (440) are movably matched to control the opening size of the first valve port (440).

5. The electronic expansion valve according to claim 1, It is characterized in that The valve core assembly (300) comprises a main core body (350) and a throttle member (360), wherein the throttle member (360) is sleeved on the outer peripheral side of the main core body (350) and is interference fit with the main core body (350), and the valve core assembly (300) controls the opening and closing of the first valve port (440) through one end of the throttle member (360) close to the rotor assembly (100), and the valve core assembly (300) controls the opening and closing of the second valve port (450) through one end of the throttle member (360) away from the rotor assembly (100).

6. The electronic expansion valve according to claim 5, It is characterized in that The valve seat assembly (400) includes a first valve seat (460) and a second valve seat (470), the first valve port (440) is arranged at one end of the first valve seat (460) away from the rotor assembly (100), the second valve seat (470) is connected to one end of the first valve seat (460) away from the rotor assembly (100) and is sleeved on the outer side of the first valve port (440), and the maximum outer diameter of the main core body (350) is smaller than the inner diameter of the first valve port (440), and the maximum outer diameter of the throttling member (360) is larger than the inner diameter of the first valve port (440) and smaller than the outer diameter of the first valve port (440).

7. The electronic expansion valve according to claim 5, It is characterized in that It also includes a second elastic sealing ring (351), which is sandwiched between the main core (350) and the throttling member (360) and is in a compressed state.

8. The electronic expansion valve according to claim 7, It is characterized in that It is defined that a connecting seam is provided between the main core body (350) and the throttling member (360), and an installation cavity connected to the connecting seam is provided between the main core body (350) and the throttling member (360), and the installation cavity divides the connecting seam into a first seam (371) and a second seam (372), and the second elastic sealing member is clamped in the installation cavity and divides the installation cavity into a first deposition cavity (381) and a second deposition cavity (382), wherein the first deposition cavity (381) is connected to the first seam (371), and the second deposition cavity (382) is connected to the second seam (372).

9. The electronic expansion valve according to claim 8, It is characterized in that One of the main core (350) and the throttling member (360) is provided with a mounting groove, and the other is sealed at the opening of the mounting groove to form the mounting cavity.

10. The electronic expansion valve according to claim 1, It is characterized in that The valve core assembly (300) further comprises a stop seat (510) connected to the valve seat assembly (400), wherein the stop seat (510) is sleeved on the outside of the screw rod (200), and the valve core assembly (300) further comprises a sliding nut (310), wherein one end of the screw rod (200) away from the rotor assembly (100) is threadedly matched with the sliding nut (310), and the sliding nut (310) and the stop seat (510) or the valve seat assembly (400) are matched with each other through a limiting structure, so that the screw rod (200) can drive the sliding nut (310) to drive the valve core assembly (300) to move relative to the stop seat (510) along the axial direction of the screw rod (200) to open or close the first valve port (440) and the second valve port (450), and the limiting structure can prevent the sliding nut (310) from rotating relative to the stop seat (510) around the axis of the screw rod (200).

11. The electronic expansion valve according to claim 10, It is characterized in that The circumferential side of the sliding nut (310) is provided with a stop protrusion (311) extending along its own radial direction, and the stop seat (510) or the valve seat assembly (400) is provided with a guide groove (515) extending along its own axial direction corresponding to the stop protrusion (311), and one end of the stop protrusion (311) away from the sliding nut (310) extends into the guide groove (515) and can slide with the guide groove (515) along the axial direction of the stop seat (510), so that the sliding nut (310) and the stop seat (510) can slide along the axial direction of the stop seat (510), and the stop protrusion (311) and the guide groove (515) constitute the limiting structure.

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