Screw structure for valve and electronic expansion valve for vehicle

Abstract

The utility model 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 for the valve 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 part of the screw rod part, a circulation hole is formed in the valve seat part, a circulation inlet is located on the peripheral wall of the valve seat part, and the circulation hole is communicated with 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 advantages that the screw and the valve seat are integrally formed, the structure is easy to machine, high precision can be achieved, the expansion valve 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] This utility model belongs to the field of automotive parts technology, and relates to a valve screw structure and an automotive electronic expansion valve. Background Technology

[0002] An electronic expansion valve is a key component in vehicle air conditioning and refrigeration systems. It is primarily used to precisely control the refrigerant flow into the evaporator, thereby controlling the cooling capacity and energy efficiency ratio of the vehicle's air conditioning system. In an electronic expansion valve, the refrigerant flow cross-sectional area is determined by the opening between the valve needle and the valve seat. The basic working principle of an electronic expansion valve is as follows: a magnetic rotor in the actuator drives a screw to rotate. The screw moves axially under the action of the threaded structure of the valve core, thereby driving the valve needle to move axially, and thus adjusting the flow area between the valve needle and the valve seat.

[0003] In the existing design, the valve needle needs to be assembled at the end of the screw, while the valve seat needs to be connected to the valve body. The screw drives the valve needle to move through axial movement, and the valve needle needs to obtain sealing pressure through a spring. Because electronic expansion valves have extremely high requirements for flow control accuracy, the structure formed by the screw and valve needle also has extremely high requirements for machining and assembly accuracy, resulting in great manufacturing difficulty. Furthermore, it is difficult to ensure that the coaxiality between the valve needle and the valve seat at the end of the screw remains within the required range. Therefore, there is still room for improvement in terms of flow control accuracy and sealing performance. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a valve screw structure and an electronic expansion valve for automobiles.

[0005] The objective of this utility model can be achieved through the following technical solution: A valve screw structure, comprising: a screw portion and a valve seat portion, wherein the valve seat portion is integrally formed with the screw portion and the valve seat portion is located at the end of the screw portion, wherein a flow hole is provided 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 forms a sealing plug by radially protruding.

[0007] An electronic expansion valve for vehicles includes the aforementioned 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 move closer to or further away from the valve needle as the screw portion moves axially. The relative position of the valve seat portion and the valve needle determines the effective flow area of ​​the flow outlet.

[0008] Preferably, the valve also includes a valve body, the valve body having a valve cavity inside, the screw portion being slidably connected to the valve body, the valve seat portion being movably disposed within the valve cavity, the valve cavity having an inlet portion and an outlet portion, the sealing plug of the valve seat portion sealing between the inlet portion and the outlet portion, the end of the valve needle being located within the outlet portion, the flow inlet of the valve seat portion communicating with the inlet portion, the flow outlet of the valve seat portion communicating with the outlet portion, and the flow rate of the outlet portion being determined by the effective flow area of ​​the flow outlet.

[0009] Preferably, the valve body also includes a mounting base, which is mounted on the outlet end of the valve body. The valve needle is movably mounted on the mounting base, and a spring is provided between the mounting base and the valve needle. When the spring is compressed, it applies a sealing pressure toward the valve seat portion to the valve needle.

[0010] Preferably, the mounting base includes a connector portion, a through hole portion, and an inner core portion. The connector portion is connected to the outlet end of the valve body. The inner core portion is fixed inside the connector portion. The through hole portion is located between the connector portion and the inner core portion and communicates with the outlet portion. The inner core portion has a core hole, which is aligned with the flow outlet and coaxially arranged. The valve needle passes through the core hole. The peripheral wall of the valve needle extends radially to form a stop. 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 stop.

[0011] Preferably, the valve seat portion has three stroke positions: fully open, closed, and pressed. An adjustment range is formed between the fully open and closed positions, and a closed range is formed between the closed and pressed positions. When the valve seat portion is in the adjustment range, the valve needle passes through 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 in the closed range, the valve needle seals the flow outlet, and the spring is compressed and applies sealing pressure to the valve needle.

[0012] Preferably, of the valve seat and the valve needle, one is a rigid component and the other is an elastic component, and the hardness of the rigid component is greater than that of the elastic component. When the valve needle and the valve seat are pressed together, the elastic component fits tightly with the rigid component through its own elastic deformation characteristics, thereby forming an elastic sealing structure.

[0013] Preferably, the flexible rigid component is made of bronze, brass, plastic, or rubber.

[0014] Preferably, the device also includes a magnetic rotor and a valve core, wherein 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 through the external thread, and the screw portion is circumferentially fixedly connected to the magnetic rotor.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. A structure in which the screw and valve seat are integrally formed is provided. This structure is simple to process and can achieve high precision. It can also be used with a valve needle that is set separately in the expansion valve, thereby improving the coaxiality of the valve needle and valve seat, thus improving the accuracy of flow control and sealing performance, and greatly reducing the processing difficulty of 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 and the valve needle. It is only necessary to ensure the coaxiality between the valve needle and the flow outlet of the valve seat. Since the valve needle and the flow outlet are very close, ensuring their coaxiality is very simple. 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 from the flow outlet. The liquid flowing out from the flow outlet flows out of the valve cavity through the outlet section. This means that the outlet flow rate of the electronic expansion valve can be controlled simply by controlling the effective flow area of ​​the flow outlet. The valve seat moves together with the screw section, which means that the magnetic rotor directly controls the stroke position of the valve seat in the valve cavity. The valve seat adjusts the effective flow area of ​​the flow outlet by its own movement.

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

[0020] 5. The valve seat and valve needle can be made of two different materials with different hardness, one with high hardness and the other with low hardness. When these two materials with different hardness are fitted together to seal (i.e., 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 undergoes elastic deformation and fits tightly together with the one with higher hardness, thereby improving the sealing effect. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of the valve screw structure of this utility model.

[0022] Figure 2This is a schematic diagram of the internal structure of the electronic expansion valve for vehicles according to this utility model.

[0023] Figure 3 This is a schematic diagram of the valve seat portion of this utility model when it is in the adjustment range.

[0024] Figure 4 This is a schematic diagram of the valve seat portion of this utility model when it is in the closed range.

[0025] Figure 5 This is an exploded view of the valve screw structure, valve needle, valve body, and mounting base of this utility model.

[0026] Figure 6 This is a cross-sectional schematic diagram of the mounting base of this utility model.

[0027] In the diagram, 100 is the screw section; 110 is the external thread; 200 is the valve seat section; 210 is the flow hole; 220 is the flow inlet; 230 is the flow outlet; 240 is the sealing plug; 300 is the valve needle; 310 is the spring; 400 is the valve body; 410 is the valve cavity; 411 is the inlet section; 412 is the outlet section; 500 is the mounting base; 510 is the connector section; 520 is the through hole section; 530 is the inner core section; 531 is the core hole; 600 is the magnetic rotor; and 700 is the valve core. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, 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 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 provided 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, while the valve seat is installed at the outlet position inside the valve body. The valve seat has a flow control hole. The magnetic rotor drives the screw to rotate, and the screw moves axially under the action of the thread, thereby moving 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. Moreover, the machining of such valve screws is very difficult. Since the valve needle needs to obtain sealing pressure through a spring, the valve needle is floating at the end of the screw, and a spring is placed between the two, which greatly increases the machining difficulty. In actual production, it is necessary to assemble it by welding or other methods, and the coaxiality and accuracy after assembly are also difficult to control.

[0031] For the reasons stated above, in this embodiment, instead of placing the valve needle 300 at the end of the screw portion 100 (i.e., the screw), the valve seat portion 200 (i.e., the valve seat) is placed at the end of the screw portion 100. The valve seat portion 200 and the screw portion 100 are integrally formed. Therefore, 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 integrally formed, which ensures absolute coaxiality between the two. This eliminates the coaxiality problem caused by assembly errors or accumulated part tolerances in traditional designs. Furthermore, the integrally formed design provides better mechanical strength and rigidity, which helps to reduce vibration and offset during movement.

[0032] Since this solution controls flow rate by moving the valve seat 200, its structure differs significantly from existing valve seats. Specifically, the valve seat 200 has a flow-through hole 210, which is designed as a blind hole. The flow inlet 220 and flow outlet 230 are the inlet and outlet of the flow-through hole 210, respectively. The flow outlet 230 is essentially the opening of the flow-through hole 210, aligned with the valve needle 300. The flow control logic of this solution is as follows: the liquid or gas to be controlled can enter the flow-through hole 210 through the flow inlet 220 and then flow out through the flow outlet 230. This means that controlling the effective flow area of ​​the flow outlet 230 can achieve precise flow control. As the valve seat 200 actively moves closer to or further 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 flow control.

[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 from the flow inlet 220 and flow out of the flow hole 210 through the flow outlet 230. In the example, 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 electronic expansion valve for vehicles 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 configured to actively move closer to or further 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 vehicle-mounted electronic expansion valve lies in combining the valve seat portion 200 and the screw portion 100 to form an actively moving element, while the valve needle 300 is set separately and is designed as a non-active element. The effective flow area of ​​its own flow outlet 230 is adjusted by the active movement of the valve seat portion 200 in coordination with the valve needle 300. That is, the valve seat portion 200 corresponds to the valve needle 300. When the screw portion 100 rotates and moves axially under the drive of the magnetic rotor 600, it can drive the valve seat portion 200 to move together, thereby changing the position of the valve seat portion 200 relative to the valve needle 300.

[0036] In this automotive electronic expansion valve, since the valve needle 300 is set separately, the step of mounting the valve needle 300 on the screw is eliminated. This not only reduces the machining difficulty, but also eliminates the coaxiality requirement between the screw part 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 part 200. Since the valve needle 300 and the flow outlet 230 are very close, ensuring their coaxiality is very simple. Therefore, the machining difficulty and precision requirements of the automotive electronic expansion valve are greatly reduced.

[0037] Based on the above embodiments, a valve body 400 is also included, with a valve cavity 410 disposed inside the valve body 400. The screw portion 100 is slidably connected to the valve body 400, and the valve seat portion 200 is movably disposed within 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 within the outlet portion 412. The flow inlet 220 of the valve seat portion 200 is connected to the inlet portion 411, and the flow outlet 230 of the valve seat portion 200 is connected to the outlet portion 412. The flow rate of the outlet portion 412 is determined by the effective flow area of ​​the flow outlet 230.

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

[0039] When liquid enters valve chamber 410 from inlet 411, it can enter the flow hole 210 of valve seat 200 from flow inlet 220, and then flow out from flow outlet 230. The liquid flowing out from flow outlet 230 flows out of valve chamber 410 via outlet 412. This means that the outlet flow rate of the electronic expansion valve can be controlled simply by controlling the effective flow area of ​​flow outlet 230. Since valve seat 200 moves together with screw 100, the magnetic rotor 600 directly controls the stroke position of valve seat 200 within valve chamber 410. Valve seat 200 adjusts the effective flow area of ​​flow outlet 230 by 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 installed at the end of the screw; if they were integrally molded, the sealing pressure could not be provided. In this embodiment, however, since the valve seat 200 and the screw 100 are integrally molded, the integral molding process ensures their coaxiality and simplifies manufacturing. Furthermore, the valve seat 200, located at the end of the screw 100, is very close to the valve needle 300, so coaxiality can be easily ensured. This helps improve flow control accuracy and the sealing performance of the electronic expansion valve.

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

[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 touches the edge of the flow outlet 230, the seal is unreliable. Therefore, a sealing pressure must be provided to the valve needle 300. After the valve needle 300 completely seals the flow outlet 230, the valve seat 200 needs to continue to descend a certain distance, thereby compressing and storing force in the spring 310. Under the action of the spring 310, the valve needle 300 pushes into the flow hole 210, thus tightly sealing the flow outlet 230.

[0043] In existing designs, a valve needle that can extend and retract axially is usually fitted onto the end of the screw, and a spring is placed between the valve needle and the screw. This design makes it impossible for the valve needle and the screw to be integrally formed, and it requires extremely high precision.

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

[0045] Based on the above embodiments, the mounting base 500 includes a connector portion 510, a through hole portion 520, and an inner core portion 530. The connector portion 510 is connected to the outlet end of the valve body 400. The inner core portion 530 is fixed inside the connector portion 510. The through hole portion 520 is located between the connector portion 510 and the inner core portion 530 and communicates 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 passes through the core hole 531. The peripheral wall of the valve needle 300 extends radially to form a stop. The spring 310 is sleeved on the inner core portion 530. The two ends of the spring 310 are respectively in contact with the inner core portion 530 and the stop.

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

[0047] Based on the above embodiments, the stroke positions of the valve seat 200 include a fully open position, a closed position, and a pressed position. An adjustment range is formed between the fully open position and the closed position, and a closed range is formed between the closed position and the pressed position. When the valve seat 200 is in the adjustment range, the valve needle 300 passes through the flow outlet 230, and the effective flow area of ​​the flow outlet 230 is determined by the stroke position of the valve seat 200. When the valve seat 200 is in the closed range, 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 just seals the flow outlet 230. When the valve seat 200 is in the compressed position, and the spring 310 is in its maximum compressed state, the valve needle 300 tightly seals the flow outlet 230 under the sealing pressure. When the valve seat 200 is in the adjustment range, part of the valve needle 300 is located within the flow outlet 230, and the valve seat 200 adjusts the effective flow area of ​​the flow outlet 230 by its own active movement. When the valve seat 200 is in the closed range, the spring 310 is in a compressed state and applies sealing pressure to the valve needle 300.

[0049] Based on the above embodiments, 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 that of the elastic hard part. When the valve needle 300 and the valve seat portion 200 are pressed together, the elastic hard part is tightly fitted with the rigid hard part through its own elastic deformation characteristics, thereby forming an elastic sealing structure.

[0050] Preferably, the elastic rigid component is made of bronze, brass, plastic, or rubber.

[0051] It should be noted that the valve seat 200 and the valve needle 300 can be made of two different materials with different hardness, one with high hardness and the other with low hardness. When these two materials with different hardness are fitted together to seal (i.e., 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 undergoes elastic deformation and fits tightly together with the one with higher hardness, 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 non-metallic materials can be used in its manufacture, thereby achieving a soft seal between the valve seat portion 200 and the valve needle 300. If the valve needle 300 and the screw need to be installed by welding, then both the screw and the valve needle 300 need to be metal parts, and the valve seat also needs to be a metal part, thus failing to achieve a soft seal.

[0053] like Figure 1 , Figure 2 As shown, based on 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, and 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 circumferentially fixedly connected to the magnetic rotor 600.

[0054] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0055] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A screw structure for a valve, characterized in that, include: The screw portion (100) and the valve seat portion (200) are 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 provided 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).

2. The valve screw structure as described in claim 1, characterized in that: The sealing plug (240) is formed by radially protruding outer wall of the valve seat portion (200).

3. An electronic expansion valve for automobiles, characterized in that, The valve screw structure includes the valve needle (300) as described in any one of claims 1 to 2, wherein the valve needle (300), the screw portion (100), and the flow outlet (230) are coaxially arranged, and the valve seat portion (200) is configured to actively move closer to or further 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).

4. The automotive electronic expansion valve as described in claim 3, characterized in that: It also includes a valve body (400), which has a valve cavity (410) inside. The screw part (100) is slidably connected to the valve body (400). The valve seat part (200) is movably disposed 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). The flow outlet (230) of the valve seat part (200) is connected to the outlet part (412). The flow rate of the outlet part (412) is determined by the effective flow area of ​​the flow outlet (230).

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

6. The automotive electronic expansion valve as described in claim 5, characterized in that: The mounting base (500) includes a connector portion (510), a through hole portion (520), and an inner core portion (530). The connector portion (510) is connected to the outlet end of the valve body (400). The inner core portion (530) is fixed inside the connector portion (510). The through hole portion (520) is located between the connector portion (510) and the inner core portion (530), and the through hole portion (520) communicates with the outlet portion (412). The inner core (530) has a core hole (531) inside, the core hole (531) is aligned with the flow outlet (230) and the two are coaxially arranged, the valve needle (300) passes through the core hole (531), the peripheral wall of the valve needle (300) extends radially to form a stop, the spring (310) is sleeved on the inner core (530), and the two ends of the spring (310) are respectively in contact with the inner core (530) and the stop.

7. The automotive electronic expansion valve as described in claim 5, characterized in that: The valve seat (200) has three stroke positions: fully open, closed, and pressed. An adjustment range is formed between the fully open and closed positions, and a closed range is formed between the closed and pressed positions. When the valve seat (200) is in the adjustment range, the valve needle (300) passes through the flow outlet (230), and the effective flow area of ​​the flow outlet (230) is determined by the stroke position of the valve seat (200). When the valve seat (200) is in the closed range, 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 automotive electronic expansion valve as described in claim 7, characterized in that: Of the valve seat (200) and the valve needle (300), one is a rigid component and the other is an elastic component. The hardness of the rigid component is greater than that of the elastic component. When the valve needle (300) and the valve seat (200) are pressed together, the elastic component fits tightly with the rigid component through its own elastic deformation characteristics, thereby forming an elastic sealing structure.

9. The automotive electronic expansion valve as described in claim 8, characterized in that: The flexible rigid parts are made of bronze, brass, plastic, or rubber.

10. The automotive electronic expansion valve as described in claim 3, characterized in that: It also includes a magnetic rotor (600) and a valve core (700). The screw part (100) is provided with an external thread (110), and 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 circumferentially fixedly connected to the magnetic rotor (600).

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