Screw structure for valve and electronic expansion valve for vehicle

Abstract

The invention provides a screw rod structure for a valve and a vehicle electronic expansion valve, and belongs to the technical field of vehicle parts, the screw rod structure comprises a screw rod part and a valve seat part, the valve seat part and the screw rod part are integrally formed, the valve seat part is located at the end of the screw rod part, a circulation hole is formed in the valve seat part, a circulation inlet is located in the circumferential wall of the valve seat part, and a circulation outlet is formed in the circumferential wall of the valve seat part; the circulation outlet is positioned at the end part of the valve seat part; the valve needle, the screw rod part and the circulation outlet are coaxially arranged, and the valve seat part is arranged to be capable of actively getting close to or getting away from the valve needle along with axial movement of the screw rod part; the expansion valve has the beneficial effects that the screw and valve seat integrated structure is provided, the structure is easy to machine, high precision can be achieved, the structure can be used in cooperation with the valve needle independently arranged in the expansion valve, and therefore the coaxiality of the valve needle and the valve seat is improved, the precision and sealing performance of flow control are improved, and the service life of the expansion valve is prolonged. And the processing difficulty of the electronic expansion valve is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle parts and relates to a valve screw structure and a vehicle electronic expansion valve. Background Art

[0002] The automotive electronic expansion valve is a key component in vehicle air conditioning and refrigeration systems. It precisely controls the refrigerant flow rate into the evaporator, thereby controlling the cooling capacity and energy efficiency of the vehicle air conditioning system. In an electronic expansion valve, the refrigerant flow area is determined by the opening between the valve needle and the valve seat. The basic operating principle of an electronic expansion valve is as follows: a magnetic rotor in the actuator rotates the screw, which, driven by the threaded structure of the valve core, moves axially, thereby driving the valve needle in the same direction, thereby adjusting the flow area between the valve needle and the valve seat.

[0003] In existing designs, the valve needle is assembled at the end of the screw, while the valve seat is connected to the valve body. The screw's axial motion drives the valve needle, while the valve needle receives sealing pressure from a spring. Because electronic expansion valves require extremely high flow control precision, the structure formed by the screw and valve needle also requires extremely high machining and assembly precision, making manufacturing very difficult. Furthermore, it is difficult to ensure that the coaxiality between the valve needle at the end of the screw and the valve seat remains within the required range. Therefore, there is room for improvement in flow control precision and sealing performance. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a valve screw structure and a vehicle electronic expansion valve.

[0005] The objectives of the present invention can be achieved through the following technical solutions: A valve screw structure, comprising: a screw portion and a valve seat portion, the valve seat portion and the screw portion being integrally formed, and the valve seat portion being located at the end of the screw portion, a flow hole being opened in the valve seat portion, the flow hole having a flow inlet and a flow outlet, the flow inlet being located on the peripheral wall of the valve seat portion, and the flow outlet being located at the end of the valve seat portion.

[0006] Preferably, the outer wall of the valve seat portion is radially raised to form a sealing plug.

[0007] A vehicle electronic expansion valve includes the valve screw structure and a valve needle. The valve needle, the screw portion and the flow outlet are coaxially arranged. The valve seat portion is configured to actively approach or move away from the valve needle with the axial movement of the screw portion. The relative position of the valve seat portion and the valve needle determines the effective flow area of ​​the flow outlet.

[0008] Preferably, it also includes a valve body, a valve cavity is provided inside the valve body, the screw portion is slidably connected to the valve body, the valve seat portion is movably provided in the valve cavity, the valve cavity has an inlet portion and an outlet portion, the sealing plug of the valve seat portion is sealed between the inlet portion and the outlet portion, the end of the valve needle is located in the outlet portion, the flow inlet of the valve seat portion is communicated with the inlet portion, the flow outlet of the valve seat portion is communicated with the outlet portion, and the flow rate of the outlet portion is determined by the effective flow area of ​​the flow outlet.

[0009] Preferably, it also includes a mounting seat, which is installed at the outlet end of the valve body, and the valve needle is movably installed on the mounting seat. A spring is provided between the mounting seat and the valve needle, and when the spring is compressed, it applies sealing pressure to the valve needle toward the valve seat.

[0010] Preferably, the mounting seat includes a joint portion, a through-hole portion and an inner core portion, the joint portion is connected to the outlet end of the valve body, the inner core portion is fixed in the joint portion, the through-hole portion is located between the joint portion and the inner core portion, the through-hole portion is communicated with the outlet portion, the inner core portion has a core hole, the core hole is aligned with the flow outlet and the two are coaxially arranged, the valve needle is inserted into the core hole, the valve needle peripheral wall extends radially to form a stopper, the spring is sleeved on the inner core portion, and the two ends of the spring are respectively in contact with the inner core portion and the stopper.

[0011] Preferably, the stroke position of the valve seat portion includes a fully open position, a closed position and a pressing position, an adjustment interval is formed between the fully open position and the closed position, and a closing interval is formed between the closed position and the pressing position; when the valve seat portion is located in the adjustment interval, the valve needle is inserted into the flow outlet, and the effective flow area of ​​the flow outlet is determined by the stroke position of the valve seat portion; when the valve seat portion is located in the closing interval, the valve needle seals the flow outlet, and the spring is compressed and applies sealing pressure to the valve needle.

[0012] Preferably, one of the valve seat portion and the valve needle is a rigid hard part and the other is an elastic hard part, and the hardness of the rigid hard part is greater than the hardness of the elastic hard part. When the valve needle is pressed against the valve seat portion, the elastic hard part fits tightly with the rigid hard part through its own elastic deformation characteristics to form an elastic sealing structure.

[0013] Preferably, the elastic hard part is a bronze part, a brass part, a plastic part, or a plastic part.

[0014] Preferably, it further includes a magnetic rotor and a valve core, the screw portion is provided with an external thread, the valve core is provided with a threaded hole, the screw portion is connected to the threaded hole via the external thread, and the screw portion is fixedly connected to the magnetic rotor in the circumferential direction.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. A structure in which the screw and the valve seat are integrally formed is provided. This structure is simple to process and can achieve high precision. It can be used in conjunction with a valve needle separately provided in the expansion valve, thereby improving the coaxiality of the valve needle and the valve seat, thereby improving the accuracy of flow control and sealing, and greatly reducing the processing difficulty of the electronic expansion valve.

[0017] 2. Since the valve needle is set separately, the step of installing the valve needle on the screw is eliminated. This not only reduces the processing difficulty, but also eliminates the coaxiality requirement between the screw part and the valve needle. It is only necessary to ensure the coaxiality between the valve needle and the flow outlet of the valve seat part. The valve needle and the flow outlet are very close, so it is very simple to ensure the coaxiality of the two. Therefore, the processing difficulty and precision requirements of the automotive electronic expansion valve are greatly reduced.

[0018] 3. Liquid can enter the flow hole of the valve seat from the flow inlet and then flow out of the flow outlet. The liquid flowing out of the flow outlet flows out of the valve cavity through the outlet. This means that the outlet flow rate of the electronic expansion valve can be controlled by simply controlling the effective flow area of ​​the flow outlet. The valve seat moves together with the screw, which means that the magnetic rotor directly controls the travel position of the valve seat within the valve cavity. The valve seat adjusts the effective flow area of ​​the flow outlet through its own movement.

[0019] 4. The mounting seat is connected to the outlet of the valve body, and the valve needle is set on the mounting seat. A spring is set between the two. The elastic force of the spring gives the valve needle sealing pressure. This design is simple to process and has low precision requirements. It can well ensure the sealing of the valve needle and the valve seat.

[0020] 5. The valve seat and the valve needle can be made of two materials with different hardness respectively, that is, one with high hardness and the other with low hardness. When these two materials with different hardness are fitted together for sealing (that is, the valve needle seals the flow outlet), they can form a sealing structure similar to a soft seal, that is, the one with lower hardness produces elastic deformation and fits tightly with the harder one, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional schematic diagram of the valve screw structure of the present invention.

[0022] Figure 2Schematic diagram of the internal structure of the vehicle electronic expansion valve of the present invention.

[0023] Figure 3 It is a schematic diagram of the valve seat portion of the present invention when it is in the adjustment range.

[0024] Figure 4 It is a schematic diagram of the valve seat portion of the present invention when it is in the closed range.

[0025] Figure 5 This is a structural exploded view of the valve screw structure, valve needle, valve body and mounting seat of the present invention.

[0026] Figure 6 It is a cross-sectional schematic diagram of the mounting base of the present invention.

[0027] In the figure, 100, screw part; 110, external thread; 200, valve seat part; 210, flow hole; 220, flow inlet; 230, flow outlet; 240, sealing plug; 300, valve needle; 310, spring; 400, valve body; 410, valve cavity; 411, inlet part; 412, outlet part; 500, mounting seat; 510, joint part; 520, through hole part; 530, inner core part; 531, core hole; 600, magnetic rotor; 700, valve core. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0029] like Figures 1 to 6 As shown, a valve screw structure includes: a screw portion 100 and a valve seat portion 200, the valve seat portion 200 and the screw portion 100 are integrally formed, and the valve seat portion 200 is located at the end of the screw portion 100, a flow hole 210 is opened in the valve seat portion 200, the flow hole 210 has a flow inlet 220 and a flow outlet 230, the flow inlet 220 is located on the peripheral wall of the valve seat portion 200, and the flow outlet 230 is located at the end of the valve seat portion 200.

[0030] It should be noted that this screw structure is suitable for electronic expansion valves. In existing electronic expansion valves, the valve needle is installed at the end of the screw, and the valve seat is installed at the outlet position inside the valve body. The valve seat is provided with a flow control hole. The magnetic rotor drives the screw to rotate, and the screw moves axially under the action of the thread, thereby driving the valve needle closer to or away from the valve seat. The relative position of the tip of the valve needle in the valve cavity determines the effective flow area of ​​the flow control hole of the valve seat. In the above-mentioned existing structure, due to the long length of the screw, it is difficult to ensure the coaxiality of the valve needle with the valve seat when it is installed at the end of the screw, and the processing of the screw for this valve is very difficult. Since the valve needle needs to obtain sealing pressure through a spring, the valve needle is floatingly set at the end of the screw, and a spring is set between the two. This greatly increases the processing difficulty. In actual production, it needs to be assembled by welding or other methods. The coaxiality and accuracy after assembly are also difficult to control.

[0031] For the above reasons, in this embodiment, the valve needle 300 is not set at the end of the screw portion 100 (i.e., the screw), but the valve seat portion 200 (i.e., the valve seat) is set at the end of the screw portion 100. The valve seat portion 200 and the screw portion 100 are formed integrally, so when the magnetic rotor 600 drives the screw portion 100 to rotate, the screw portion 100 and the valve seat portion 200 move axially together. The advantage of this design is that since there is no need to set a spring structure between the valve seat and the screw, the valve seat portion 200 and the screw portion 100 can be directly formed integrally, which ensures absolute coaxiality between the two. It eliminates the coaxiality problem caused by assembly errors or accumulated part tolerances in traditional designs. In addition, the one-piece design provides better mechanical strength and rigidity, which helps to reduce vibration and offset during movement.

[0032] Since this solution controls the flow rate by moving the valve seat 200, the corresponding structure is significantly different from that of the existing valve seat. Specifically, a flow hole 210 is provided in the valve seat 200. The flow hole 210 is designed as a blind hole structure. The flow inlet 220 and the flow outlet 230 are the inlet and outlet of the flow hole 210 respectively. The flow outlet 230 is actually the opening of the flow hole 210, and the flow outlet 230 is aligned with the valve needle 300. The logic of controlling the flow rate of this solution is as follows: the liquid or gas to be controlled can enter the flow hole 210 from the flow inlet 220 and then flow out from the flow outlet 230. This means that the effective flow area of ​​the flow outlet 230 can achieve precise control of the flow rate. As the valve seat 200 actively approaches or moves away from the valve needle 300, the effective flow area between the valve needle 300 and the flow outlet 230 changes accordingly, thereby achieving precise control of the flow rate.

[0033] Based on the above embodiment, a sealing plug 240 is formed by radially protruding from the outer wall of the valve seat portion 200. The main function of the sealing plug 240 is to block the outlet of the valve cavity 410, thereby controlling the fluid path, so that the liquid in the valve cavity 410 can only enter the flow hole 210 through the flow inlet 220 and flow out of the flow hole 210 through the flow outlet 230. In this embodiment, a sealing ring is provided between the outer peripheral surface of the sealing plug 240 and the inner wall surface of the valve cavity 410.

[0034] like Figures 1 to 6 As shown, an automotive electronic expansion valve includes a valve screw structure and a valve needle 300. The valve needle 300, the screw portion 100 and the flow outlet 230 are coaxially arranged. The valve seat portion 200 is arranged to actively approach or move away from the valve needle 300 as the screw portion 100 moves axially. The relative position of the valve seat portion 200 and the valve needle 300 determines the effective flow area of ​​the flow outlet 230.

[0035] The design of this automotive electronic expansion valve is characterized by combining the valve seat 200 and the screw 100 to form an actively moving element, while the valve needle 300 is provided separately and remains inactive. The active movement of the valve seat 200 cooperates with the valve needle 300 to adjust the effective flow area of ​​its flow outlet 230. Specifically, the valve seat 200 corresponds to the valve needle 300, and when the screw 100 rotates and moves axially under the influence of the magnetic rotor 600, it drives the valve seat 200 with it, thereby changing the position of the valve seat 200 relative to the valve needle 300.

[0036] In the present automotive electronic expansion valve, since the valve needle 300 is provided separately, the step of installing the valve needle 300 on the screw is eliminated. This not only reduces the processing difficulty, but also eliminates the coaxiality requirement between the screw portion 100 and the valve needle 300. It is only necessary to ensure the coaxiality between the valve needle 300 and the flow outlet 230 of the valve seat portion 200. The valve needle 300 and the flow outlet 230 are very close to each other, so it is very simple to ensure the coaxiality between the two. Therefore, the processing difficulty and precision requirements of the automotive electronic expansion valve are greatly reduced.

[0037] On the basis of the above embodiment, it also includes a valve body 400, a valve cavity 410 is provided inside the valve body 400, the screw part 100 is slidingly connected to the valve body 400, the valve seat part 200 is movably provided in the valve cavity 410, the valve cavity 410 has an inlet part 411 and an outlet part 412, the sealing plug 240 of the valve seat part 200 is sealed between the inlet part 411 and the outlet part 412, the end of the valve needle 300 is located in the outlet part 412, the flow inlet 220 of the valve seat part 200 is connected to the inlet part 411, and the flow outlet 230 of the valve seat part 200 is connected to the outlet part 412, and the flow rate of the outlet part 412 is determined by the effective flow area of ​​the flow outlet 230.

[0038] In the example, the vehicle electronic expansion valve also includes a valve island, which has a liquid inlet channel and a liquid outlet channel. The valve body 400 is installed in the valve island, the inlet portion 411 of the valve cavity 410 is connected to the liquid inlet channel, and the outlet portion 412 of the valve cavity 410 is connected to the liquid outlet channel. The valve seat portion 200 is slidably arranged in the valve cavity 410, and the sealing plug 240 of the valve seat portion 200 separates the inlet portion 411 and the outlet portion 412. This means that after the liquid enters the valve cavity 410 from the inlet portion 411, it cannot flow out directly from the outlet portion 412, and must pass through the flow hole 210 in the valve seat portion 200 before it can flow out from the outlet portion 412.

[0039] After liquid enters the valve chamber 410 through the inlet 411, it enters the flow hole 210 of the valve seat 200 through the flow inlet 220 and then flows out of the flow outlet 230. The liquid flowing out of the flow outlet 230 flows out of the valve chamber 410 through the outlet 412. This means that the outlet flow rate of the electronic expansion valve can be controlled by simply controlling the effective flow area of ​​the flow outlet 230. The valve seat 200 moves together with the screw 100, which means that the magnetic rotor 600 directly controls the travel position of the valve seat 200 within the valve chamber 410. The valve seat 200 adjusts the effective flow area of ​​the flow outlet 230 through its own movement.

[0040] It should be noted that the valve needle and screw cannot be integrally molded because the valve needle needs to be mounted at the end of the screw. If this were done, sealing pressure would be lost. In this embodiment, however, the valve seat portion 200 is integrally molded with the screw portion 100. This integral molding process ensures coaxiality between the two and simplifies processing. Furthermore, the valve seat portion 200, located at the end of the screw portion 100, is very close to the valve needle 300, making it easy to ensure coaxiality between the two. This helps improve flow control accuracy and the sealing performance of the electronic expansion valve.

[0041] like Figures 2 to 6 As shown, on the basis of the above embodiment, it also includes a mounting seat 500, which is installed at the outlet end of the valve body 400, and the valve needle 300 is movably installed on the mounting seat 500. A spring 310 is arranged between the mounting seat 500 and the valve needle 300, and when the spring 310 is compressed, it applies sealing pressure to the valve needle 300 toward the valve seat portion 200.

[0042] The electronic expansion valve has a closed state, where the valve needle 300 completely seals the flow outlet 230 and the flow rate is zero. If the valve needle 300 merely fits against the edge of the flow outlet 230, the seal is unreliable. Therefore, sealing pressure must be applied to the valve needle 300. Specifically, after the valve needle 300 completely seals the flow outlet 230, the valve seat 200 must continue to descend a certain distance, compressing and accumulating force in the spring 310. This forces the valve needle 300 toward the flow hole 210, thereby tightly sealing the flow outlet 230.

[0043] In existing designs, an axially retractable valve needle is usually sleeved on the end of the screw, and a spring is provided between the valve needle and the screw. This design prevents the valve needle and the screw from being integrally formed, and places extremely high demands on precision.

[0044] Therefore, in this solution, a mounting seat 500 is specially provided, which is connected to the outlet of the valve body 400. The valve needle 300 is arranged on the mounting seat 500, and a spring 310 is arranged between the two. The elastic force of the spring 310 gives sealing pressure to the valve needle 300. This design is simple to process and has low precision requirements, and can well ensure the sealing of the valve needle 300 and the valve seat part 200.

[0045] On the basis of the above embodiment, the mounting seat 500 includes a joint portion 510, a through hole portion 520 and an inner core portion 530. The joint portion 510 is connected to the outlet end of the valve body 400, the inner core portion 530 is fixed in the joint portion 510, the through hole portion 520 is located between the joint portion 510 and the inner core portion 530, the through hole portion 520 is communicated with the outlet portion 412, the inner core portion 530 has a core hole 531, the core hole 531 is aligned with the flow outlet 230 and the two are coaxially arranged, the valve needle 300 is inserted into the core hole 531, the peripheral wall of the valve needle 300 extends radially to form a stopper, the spring 310 is sleeved on the inner core portion 530, and the two ends of the spring 310 are respectively connected with the inner core portion 530 and the stopper.

[0046] The inner core portion 530 is located inside the joint portion 510, and the two are connected by a solid part. The through hole portion 520 is a hollow portion between the inner core portion 530 and the joint portion 510. The through hole portion 520 allows the liquid flowing out of the flow outlet 230 to pass through the installation. The core hole 531 of the inner core portion 530 is coaxially arranged with the flow outlet 230, so the valve needle 300 can be inserted into the core hole 531 to be coaxial with the flow outlet 230.

[0047] On the basis of the above embodiment, the stroke position of the valve seat portion 200 includes a fully open position, a closed position and a pressed position. An adjustment interval is formed between the fully open position and the closed position, and a closed interval is formed between the closed position and the pressed position. When the valve seat portion 200 is in the adjustment interval, the valve needle 300 is inserted into the flow outlet 230, and the effective flow area of ​​the flow outlet 230 is determined by the stroke position of the valve seat portion 200. When the valve seat portion 200 is in the closed interval, the valve needle 300 seals the flow outlet 230, and the spring 310 is compressed and applies sealing pressure to the valve needle 300.

[0048] It should be noted that when the valve seat 200 is in the fully open position, the effective flow area of ​​the flow outlet 230 is at its maximum. When the valve seat 200 is in the closed position, the valve needle 300 precisely seals the flow outlet 230. When the valve seat 200 is in the compressed position and the spring 310 is at its maximum compression, the valve needle 300 tightly seals the flow outlet 230 under the action of sealing pressure. When the valve seat 200 is in the adjustment range, a portion of the valve needle 300 is located within the flow outlet 230, and the valve seat 200 actively moves to adjust the effective flow area of ​​the flow outlet 230. When the valve seat 200 is in the closed range, the spring 310 is compressed and applies sealing pressure to the valve needle 300.

[0049] On the basis of the above embodiment, one of the valve seat portion 200 and the valve needle 300 is a rigid hard part and the other is an elastic hard part, and the hardness of the rigid hard part is greater than the hardness of the elastic hard part. When the valve needle 300 and the valve seat portion 200 are pressed tightly, the elastic hard part fits tightly with the rigid hard part through its own elastic deformation characteristics to form an elastic sealing structure.

[0050] Preferably, the elastic hard part is a bronze part, a brass part, a plastic part, or a plastic part.

[0051] It should be noted that the valve seat portion 200 and the valve needle 300 can be made of two materials with different hardness respectively, that is, one has a high hardness and the other has a low hardness. When these two materials with different hardness are fitted and sealed (that is, the valve needle 300 seals the flow outlet 230), they can form a sealing structure similar to a soft seal, that is, the one with lower hardness produces elastic deformation and fits tightly with the harder one, thereby improving the sealing effect.

[0052] It should also be noted that since the valve needle 300 does not need to be mounted on the screw portion 100, the screw portion 100 and the valve needle 300 do not need to be welded. This means that they can be made of non-metallic materials, thereby achieving a soft seal between the valve seat portion 200 and the valve needle 300. If the valve needle 300 and the screw were to be mounted by welding, both the screw and the valve needle 300 would need to be made of metal, and the valve seat would also need to be made of metal, thus failing to achieve a soft seal.

[0053] like Figure 1 、 Figure 2 As shown, on the basis of the above embodiment, it also includes a magnetic rotor 600 and a valve core 700, the screw part 100 is provided with an external thread 110, the valve core 700 is provided with a threaded hole, the screw part 100 is connected to the threaded hole through the external thread 110, and the screw part 100 is fixedly connected to the magnetic rotor 600 in the circumferential direction.

[0054] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A valve screw structure, characterized in that: include: A screw portion (100) and a valve seat portion (200), wherein the valve seat portion (200) is integrally formed with the screw portion (100), and the valve seat portion (200) is located at the end of the screw portion (100), a flow hole (210) is opened in the valve seat portion (200), and the flow hole (210) has a flow inlet (220) and a flow outlet (230), the flow inlet (220) is located on the peripheral wall of the valve seat portion (200), and the flow outlet (230) is located at the end of the valve seat portion (200).

2. A valve screw structure according to claim 1, characterized in that: The outer wall of the valve seat portion (200) is protruded in the radial direction to form a sealing plug (240).

3. A vehicle electronic expansion valve, characterized in that: It comprises a valve screw structure as described in any one of claims 1 to 2, and also comprises a valve needle (300), wherein the valve needle (300), the screw portion (100) and the flow outlet (230) are coaxially arranged, and the valve seat portion (200) is arranged to be able to actively approach or move away from the valve needle (300) with the axial movement of the screw portion (100), and the relative position of the valve seat portion (200) and the valve needle (300) determines the effective flow area of ​​the flow outlet (230).

4. The vehicle electronic expansion valve according to claim 3, characterized in that: The invention also includes a valve body (400), wherein a valve cavity (410) is arranged inside the valve body (400), the screw portion (100) is slidably connected to the valve body (400), the valve seat portion (200) is movably arranged in the valve cavity (410), the valve cavity (410) has an inlet portion (411) and an outlet portion (412), the sealing plug (240) of the valve seat portion (200) is sealed between the inlet portion (411) and the outlet portion (412), the end of the valve needle (300) is located in the outlet portion (412), the flow inlet (220) of the valve seat portion (200) is connected to the inlet portion (411), the flow outlet (230) of the valve seat portion (200) is connected to the outlet portion (412), and the flow rate of the outlet portion (412) is determined by the effective flow area of ​​the flow outlet (230).

5. The vehicle electronic expansion valve according to claim 4, characterized in that: It also includes a mounting seat (500), wherein the mounting seat (500) is mounted on the outlet end of the valve body (400), and the valve needle (300) is movably mounted on the mounting seat (500). A spring (310) is provided between the mounting seat (500) and the valve needle (300), and when the spring (310) is compressed, it applies a sealing pressure to the valve needle (300) toward the valve seat portion (200).

6. The vehicle electronic expansion valve according to claim 5, characterized in that: The mounting seat (500) comprises a joint portion (510), a through hole portion (520) and an inner core portion (530), wherein the joint portion (510) is connected to the outlet end of the valve body (400), the inner core portion (530) is fixed in the joint portion (510), the through hole portion (520) is located between the joint portion (510) and the inner core portion (530), and the through hole portion (520) is communicated with the outlet portion (412). The inner core part (530) has a core hole (531) therein, the core hole (531) is aligned with the flow outlet (230) and the two are coaxially arranged, the valve needle (300) is inserted into the core hole (531), the peripheral wall of the valve needle (300) extends radially to form a stopper, the spring (310) is sleeved on the inner core part (530), and the two ends of the spring (310) are respectively in contact with the inner core part (530) and the stopper.

7. The vehicle electronic expansion valve according to claim 5, characterized in that: The stroke position of the valve seat portion (200) includes a fully open position, a closed position and a clamping position, an adjustment interval is formed between the fully open position and the closed position, and a closed interval is formed between the closed position and the clamping position; when the valve seat portion (200) is located in the adjustment interval, the valve needle (300) is inserted into the flow outlet (230), and the effective flow area of ​​the flow outlet (230) is determined by the stroke position of the valve seat portion (200); when the valve seat portion (200) is located in the closed interval, the valve needle (300) seals the flow outlet (230), and the spring (310) is compressed and applies sealing pressure to the valve needle (300).

8. The vehicle electronic expansion valve according to claim 7, characterized in that: One of the valve seat portion (200) and the valve needle (300) is a rigid hard part and the other is an elastic hard part, and the hardness of the rigid hard part is greater than the hardness of the elastic hard part. When the valve needle (300) is pressed against the valve seat portion (200), the elastic hard part fits tightly with the rigid hard part through its own elastic deformation characteristics to form an elastic sealing structure.

9. The vehicle electronic expansion valve according to claim 8, characterized in that: The elastic hard part is a bronze part, a brass part, a plastic part or a plastic part.

10. The vehicle electronic expansion valve according to claim 3, characterized in that: It also includes a magnetic rotor (600) and a valve core (700), wherein the screw portion (100) is provided with an external thread (110), and the valve core (700) is provided with a threaded hole, and the screw portion (100) is connected to the threaded hole via the external thread (110), and the screw portion (100) is circumferentially fixedly connected to the magnetic rotor (600).

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