An electrically operated valve core

Abstract

The present application provides a kind of electric valve core, belong to valve technical field.It solves the problem of affecting water pressure in existing slow closing pilot type solenoid valve by relying on the elastic deformation of flexible valve core to open and close valve.The electric valve core includes driving member, valve core shell in the form of cylinder, valve stem and valve sleeve, the balance cavity is formed between valve sleeve and the valve core shell, the balance cavity is communicated to the outside of valve core shell by balance hole, the valve sleeve is in the form of cylinder and is sleeved on the outside of the front end of valve core shell, the inside of the front end of valve sleeve has annular linkage part, the front end of valve stem is provided with front blocking part and rear blocking part, the linkage part is clamped between front blocking part and rear blocking part, sealing element is further provided between linkage part and rear blocking part, and water outlet hole is formed between linkage part and the outside of valve stem.The electric valve core will not affect water pressure.

Description

Technical Field

[0001] This invention belongs to the field of valve technology and relates to an electric valve core. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium. In actual use, when a valve controls the opening and closing of a pipeline, both the valve core and the valve stem are subjected to the pressure and impact force of the medium in the pipeline, making it difficult to open and close the valve.

[0003] To address this, a slow-closing pilot-operated solenoid valve was designed and a Chinese patent was applied for, with application number 201510185699.8 and publication number CN104763839B. This slow-closing pilot-operated solenoid valve includes a flexible valve core, a throttle plug, an upper chamber sleeve, a return spring, an electromagnetic coil, and a moving iron core. The upper port of the upper chamber sleeve is closed, while its lower port is open. The electromagnetic coil wraps around the upper half of the upper chamber sleeve. Inside the upper chamber sleeve, a return spring and a moving iron core are arranged from top to bottom. A sealing gasket is fixedly installed at the lower end of the moving iron core. A flexible valve core is installed at the lower port of the upper chamber sleeve. The upper chamber sleeve and the flexible valve core surround each other to form the upper chamber of the valve core. The valve core is equipped with a pilot valve hole and a balance hole. The upper ends of both the pilot valve hole and the balance hole are connected to the upper cavity of the valve core, and the lower end of the pilot valve hole is connected to the outlet main valve port, which in turn connects to the outlet of the slow-closing pilot-operated solenoid valve. The lower end of the balance hole is connected to the inlet main valve port, which in turn connects to the inlet of the slow-closing pilot-operated solenoid valve. When the solenoid coil is not energized, the sealing gasket closes the pilot valve hole. A throttling plug is installed in the balance hole to throttle the water flow entering the upper cavity of the valve core and prevent the balance hole from being blocked by dirt. This effectively prolongs the valve closing time, thus reliably and slowly closing the valve, effectively reducing or even eliminating the hydraulic impact during valve closure. This slow-closing pilot-operated solenoid valve, through the flexible valve core and the use of pilot valve holes and balance holes of different diameters, utilizes water pressure balance to control the opening and closing of the valve, improving the problem of difficult valve opening and closing.

[0004] However, the flexible valve core in this slow-closing pilot-operated solenoid valve is a thin sheet structure made of deformable rubber and plastic film materials. The valve's opening and closing is controlled by the elastic deformation of this sheet. During installation, the edge of the thin, flexible valve core is tightly pressed into the housing, with the inlet and outlet located on the same side of the flexible valve core. To ensure a tight seal between the flexible valve core and the outlet, the edge of the flexible valve core needs to be positioned as close to the outlet as possible. Therefore, when the valve is opened, the amount of elastic deformation of the flexible valve core away from the outlet is limited, resulting in a limited water passage at the outlet and affecting the water flow rate, pressure, and volume.

[0005] Faced with this problem, a conventional technical approach readily conceived by those skilled in the art is to press the edge of the flexible valve core away from the outlet, ensuring sufficient outlet clearance between the outlet port and the flexible valve core when the flexible valve core is moved away from the outlet. Simultaneously, to ensure the sealing performance of the flexible valve core, a spring is installed on the other side to assist in its repositioning and sealing. However, while this conventional approach improves the outlet clearance, the spring's presence inevitably causes the flexible valve core to tend to move towards the outlet, impacting water flow. Furthermore, long-term use of elastic components such as the spring and flexible valve core can lead to operational instability due to elastic fatigue. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in the prior art by proposing an electric valve core that solves the problem of the existing slow-closing pilot-operated solenoid valve relying on the elastic deformation of the flexible valve core to open and close the valve, thus affecting the outlet water pressure.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An electric valve core includes a drive component, a cylindrical valve core shell, a valve stem passing through the valve core shell, and a valve sleeve. The rear end of the valve stem is connected to the drive component and can reciprocate along its own axial direction under the drive of the drive component. A balance cavity is formed between the valve sleeve and the valve core shell. The balance cavity is connected to the outside of the valve core shell through a balance hole. The valve sleeve is cylindrical and sleeved on the outside of the front end of the valve core shell. The inner side of the front end of the valve sleeve has a protruding annular linkage portion. The front end of the valve stem has an alternating front blocking portion and a rear blocking portion. The linkage portion is engaged between the front blocking portion and the rear blocking portion, and the axial thickness of the linkage portion is less than the distance between the front blocking portion and the rear blocking portion. A sealing element is also provided between the linkage portion and the rear blocking portion. A water outlet is formed between the linkage portion and the outer side of the valve stem, and the cross-sectional area of ​​the water outlet is greater than the cross-sectional area of ​​the balance hole.

[0009] In this electric valve core, the driving component is at the rear end, and the valve sleeve is at the front end. It can be installed at the outlet of a pipeline system. The outlet is located on the front side of the valve sleeve. The front end of the valve sleeve is used to close the outlet, and the rear side of the valve sleeve is used to cooperate with the valve core shell to form a balance chamber. Because the inner side of the linkage extends between the front and rear blocking parts and the axial thickness of the linkage part is small, the linkage part of the valve sleeve can move axially back and forth between the front and rear blocking parts and abut against the front and rear blocking parts respectively. That is, the linkage part of the valve sleeve is axially limited between the front and rear blocking parts. In the initial water-closing state, the valve stem moves axially forward under the drive of the driving component, and the rear blocking part approaches the linkage part. This causes the sealing component located between the linkage part and the rear blocking part to abut against the rear end face of the linkage part and block the outlet. At the same time, the valve stem can push the valve sleeve forward synchronously by relying on the abutment of the sealing component and the linkage part, and then the front end face of the valve sleeve blocks the outlet. At this time, no water is flowing from the pipeline system. Water flows into the balance chamber through the balance hole, keeping the water pressure in the balance chamber and at the pipeline inlet balanced. When water is supplied, the valve stem is driven to move axially backward by the driving component. The valve sleeve remains stationary at first. As the rear blocking part and the linkage part move away from each other, the seal no longer blocks the outlet hole, and the outlet hole opens. Water in the balance chamber flows out to the outlet. Because the cross-sectional area of ​​the outlet hole is larger than that of the balance hole, the water flow rate is faster than the rate at which water is added to the balance chamber. The water pressure difference between the rear and front sides of the valve sleeve decreases rapidly, reducing the resistance to the backward movement of the valve sleeve. When the valve stem moves backward a certain distance, the front blocking part abuts against the front end face of the linkage part. The valve stem can then drive the valve sleeve to move backward synchronously through the front blocking part, so that the front end of the valve sleeve completely leaves the outlet, thus fully opening the outlet.

[0010] During the use of this electric valve core, the inner side of the linkage extends between the front blocking part and the seal, and the axial distance between the front blocking part and the seal is greater than the axial width difference of the linkage. This allows the valve stem to drive the front blocking part and the seal to move axially relative to the valve sleeve and open the outlet hole, allowing water to flow out of the balance chamber, reducing the water pressure in the balance chamber, and thus reducing the resistance of the valve sleeve moving backward to open the water passage. Furthermore, the front blocking part abuts against the front end face of the linkage, driving the valve sleeve to move backward synchronously to autonomously control the size of the outlet gap and avoid affecting the outlet pressure. In addition, the cylindrical valve sleeve structure design means that the edge of the valve sleeve does not need to be fixed inside the valve core shell, and the valve sleeve itself does not need to be made of rubber. It can be driven to move backward synchronously after the valve stem moves. That is, the distance between the outlet port and the valve sleeve used to seal the outlet port can be autonomously controlled by the drive component. When the installation space is sufficient, the water passage gap can be significantly increased, avoiding affecting the outlet gap. This solves the problem in existing technologies where elastically deformable diaphragms are used to open and close the water passage, thus affecting the outlet pressure.

[0011] In the aforementioned electric valve core, the front blocking portion includes a retaining ring. The inner surface of the retaining ring has several recessed clearance notches. The distance between the bottom of the clearance notches and the center of the retaining ring is greater than the radius of the valve stem opposite to the linkage portion. The clearance notch design on the inner surface of the retaining ring ensures both axial restraint of the retaining ring on the valve sleeve and avoids excessive obstruction of water flow from the outlet, ensuring smooth and rapid water flow at the outlet. This results in higher drive response efficiency and faster water flow from the drive component.

[0012] In the aforementioned electric valve core, the valve stem and the valve sleeve are in a clearance fit. The rear end face of the linkage part has a rearwardly protruding annular convex ring. The convex ring is located near the inner hole of the linkage part, and a forward-recessed annular pressure-bearing groove is formed on the outer side of the convex ring. The sealing element can abut against the convex ring to form a seal, and the outer edge of the sealing element is opposite to the pressure-bearing groove. After the sealing element abuts against the convex ring, it blocks the water outlet. Because the valve stem and the valve sleeve are in a clearance fit, there is a gap between them for water to pass through, which can connect to the pressure-bearing groove. This ensures that the water pressure borne by the end of the sealing element in the balance chamber is consistent with that at other positions, avoiding the problem of difficulty in opening due to a pressure difference before and after the sealing element.

[0013] In one type of electric valve core described above, the valve stem has a recessed annular groove on its outer side. The electric valve core also includes an elongated conductive element, the middle of which is bent into an annular shape and inserted into the groove. The end of the conductive element passes through the valve core housing axially, and a balance hole is formed between the outer side of the conductive element and the valve core housing. The conductive element is engaged in the groove outside the valve stem, allowing it to move synchronously with the valve stem as it moves axially, while the valve core housing remains stationary. This ensures that the conductive element can clear the balance hole, preventing it from becoming blocked.

[0014] In the aforementioned electric valve core, the outer side of the valve core shell has a recessed annular groove. The port of the balance hole, located outside the balance chamber, is situated on the groove wall in front of the groove. The rear end of the valve sleeve partially covers the groove opening. The outer diameter of the groove wall on the rear side of the groove is larger than the outer diameter of the valve sleeve. This larger outer diameter ensures that the rear end face of the valve sleeve does not protrude beyond the outer surface of the valve core shell, reducing the force exerted by the water flow on the rear end face of the valve sleeve and making the valve sleeve easier to open.

[0015] In one of the aforementioned electric valve cores, the front end of the valve sleeve has an annular sealing portion. The annular sealing portion is used to cooperate with the outlet port in the pipeline to achieve a seal.

[0016] In the aforementioned electric valve core, the driving component is a motor, and the valve stem includes a rod-shaped linkage rod and a cylindrical limiting sleeve. The rear end of the limiting sleeve is threaded to the output end of the driving component, and the front end of the limiting sleeve is threaded to the outer side of the rear end of the linkage rod. The outer surface of the limiting sleeve has a regular hexagonal cross-section, and the inner side of the valve core shell has a limiting segment with a regular hexagonal cross-section corresponding to the position of the limiting sleeve. The limiting segment circumferentially limits the limiting sleeve, allowing the limiting sleeve to convert the circumferential rotation of the motor into axial movement.

[0017] In the aforementioned electric valve core, the rear blocking portion is annularly located outside the linkage rod. The outer side of the linkage rod also has a recessed annular sealing groove. The rear blocking portion and the sealing groove are adjacent, with the rear blocking portion located behind the sealing groove. The inner side of the sealing element is engaged within the sealing groove, and the rear side of the sealing element abuts against the rear blocking portion. The front end of the limiting sleeve is fitted onto the outer side of the sealing element, and the outer side of the sealing element abuts against the inner wall of the limiting sleeve. The sealing groove, the rear blocking portion, and the limiting sleeve provide abutment and limitation for the sealing element in all directions except for the front end face, ensuring the stability of the sealing element's position and thus guaranteeing the effectiveness of the seal.

[0018] Compared with existing technologies, the cylindrical valve sleeve in this electric valve core can be moved backward synchronously by the valve stem after it moves. That is, the distance between the outlet port and the valve sleeve used to block the outlet port can be autonomously controlled by the drive component. When there is enough installation space, the water passage gap can be greatly increased, avoiding affecting the water outlet gap and water pressure. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the electric valve core when water is flowing through it.

[0020] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0021] Figure 3 This is a cross-sectional structural diagram of the electric valve core when the water is turned off.

[0022] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0023] Figure 5 This is a schematic diagram of the retaining ring in the electric valve core.

[0024] Figure 6 This is a schematic diagram of the conductive component in this electric valve core.

[0025] Figure 7 This is a diagram showing the state of the electric valve core when it is installed in the pipeline and the water is turned off.

[0026] Figure 8 This is a diagram showing the state of the electric valve core when the valve stem is moved backward after installation in the pipeline.

[0027] Figure 9 This is a diagram showing the state of the electric valve core installed in the pipeline, with the valve sleeve moving backward synchronously with the valve stem.

[0028] In the diagram, 1. Driving component; 2. Valve core housing; 21. Balance hole; 22. Water outlet hole; 23. Groove; 24. Limiting section; 3. Valve stem; 31. Limiting groove; 33. Seal; 34. Front blocking part; 34a. Relief notch; 35. Slot; 36. Linkage rod; 37. Limiting sleeve; 38. Sealing groove; 39. Rear blocking part; 4. Valve sleeve; 41. Linkage part; 42. Protruding ring; 43. Pressure bearing groove; 44. Sealing part; 5. Balance chamber; 6. Conductor. Detailed Implementation

[0029] 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.

[0030] like Figure 1 and Figure 2 As shown, this electric valve core includes a drive component 1, a cylindrical valve core housing 2, a valve stem 3 passing through the valve core housing 2, and a cylindrical valve sleeve 4. The drive component 1 is a motor. The rear end of the valve core housing 2 is fixed to the drive component 1. The output shaft of the motor passes through the valve core housing 2, and an O-ring seal is achieved between the outer side of the motor output shaft and the inner wall of the valve core housing 2. The rear end of the valve stem 3 passes through the valve core housing 2 and is drively connected to the output shaft of the drive component 1. The valve stem 3 can reciprocate along its own axis under the drive of the drive component 1. In this embodiment, the valve stem 3 includes a rod-shaped linkage rod 36 and a cylindrical limiting sleeve 37. The rear end of the limiting sleeve 37 is threaded to the outside of the motor output shaft, and the rear end of the linkage rod 36 is threaded to the inside of the front end of the limiting sleeve 37. The outer surface of the limiting sleeve 37 has a regular hexagonal cross-section, and the inner surface of the valve core shell 2 has a limiting section 24 with a regular hexagonal cross-section. The limiting section 24 limits the circumferential movement of the limiting sleeve 37, so that the circumferential rotation of the motor output shaft can drive the limiting sleeve 37 and the linkage rod 36 to move axially. The front end of the valve sleeve 4 has an annular sealing portion 44, which is an annular gasket.

[0031] The rear end of the valve sleeve 4 is fitted onto the outer side of the front end of the valve core shell 2, and the two are sealed by an O-ring fixed to the outer side of the valve core shell 2. The inner side of the front end of the valve sleeve 4 has an inwardly protruding annular linkage part 41. The front end of the linkage rod 36 in the valve stem 3 passes through the inner hole of the linkage part 41 and exits the front port of the valve sleeve 4. The front end of the valve core shell 2 is recessed. A balance cavity 5 is formed between the linkage part 41 of the valve sleeve 4 and the front end of the valve core shell 2. A balance hole 21 is axially opened at an eccentric position on the valve sleeve, connecting the balance cavity 5 and the outer side of the valve core shell 2. In this embodiment, the outer side of the valve core shell 2 has a recessed annular groove 23. The port of the balance hole 21 located outside the balance cavity 5 is located on the groove wall in front of the groove 23. The rear end of the valve sleeve 4 can partially cover the groove opening of the groove 23. The outer diameter of the groove wall behind the groove 23 is larger than the outer diameter of the valve sleeve 4.

[0032] The outer side of the front end of the valve stem 3 has a recessed, annular limiting groove 31. The linkage part 41 extends into the limiting groove 31 and is axially limited within it. The width of the limiting groove 31 in the axial direction of the valve stem 3 is greater than the width of the linkage part 41 in the axial direction of the valve stem 3. An annular water outlet hole 22 is formed between the inner side of the linkage part 41 and the bottom surface of the limiting groove 31. The minimum cross-sectional area of ​​the water outlet hole 22 is greater than the minimum cross-sectional area of ​​the balance hole 21. In this embodiment, there are two balance holes 21, and the minimum cross-sectional area of ​​the water outlet hole 22 is greater than the sum of the cross-sectional areas of the two balance holes 21.

[0033] Specifically, the linkage rod 36 is axially fixed with a sealing element 33 and a front blocking part 34, both of which are in the shape of annular rings. The sealing element 33 and the front blocking part 34 are spaced apart and form the aforementioned limiting groove 31 between them. The front blocking part 34 can abut against the front end face of the linkage part 41, and the sealing element 33 can abut against the rear end of the linkage part 41 and block the water outlet hole 22.

[0034] In this embodiment, the outer side of the linkage rod 36 has a recessed annular sealing groove 38 and a protruding annular rear blocking portion 39. The rear blocking portion 39 and the sealing groove 38 are arranged adjacent to each other, with the rear blocking portion 39 located behind the sealing groove 38. The sealing member 33 is a flat gasket made of rubber material. The inner side of the sealing member 33 is inserted into the sealing groove 38, and the rear side of the sealing member 33 can abut against the rear blocking portion 39. The front end of the limiting sleeve 37 extends forward and is sleeved on the outer side of the sealing member 33, and the outer side of the sealing member 33 abuts against the inner wall of the limiting sleeve 37. The outer side of the linkage rod 36 has a recessed annular connecting groove, such as... Figure 5 As shown, the front blocking part 34 is a retaining ring, which is inserted into the connecting groove on its inner side and has a notch on the front blocking part 34. The inner side of the front blocking part 34 has several recessed clearance notches 34a, which are distributed at intervals. The distance between the bottom of the clearance notch 34a and the center of the front blocking part 34 is greater than the distance between the bottom surface of the limiting groove 31 and the axis of the valve stem 3.

[0035] The valve stem 3 and the valve sleeve 4 are clearance fit. The rear end face of the linkage part 41 has a rearward protruding annular convex ring 42. The convex ring 42 is located close to the inner hole of the linkage part 41 and a forward-recessed annular pressure-bearing groove 43 is formed on the outer side of the convex ring 42. The middle part of the seal 33 can abut against the convex ring 42 to form a seal, and the outer edge of the seal 33 is opposite to the position of the pressure-bearing groove 43.

[0036] Two through holes are axially protruding at an eccentric position on the valve core housing 2. The outer side of the limiting sleeve 37 of the valve stem 3 has a recessed annular groove 35, such as... Figure 6 As shown, the electric valve core also includes a long strip-shaped guide 6. The middle part of the guide 6 is bent into a ring shape and inserted into the slot 35. The two ends of the guide 6 pass through two through holes respectively, and the two balance holes 21 are formed between the outer side of the guide 6 and the side wall of the through hole.

[0037] like Figure 7 As shown, this electric valve core can be installed in a right-angled pipeline, with the inlet facing the outside of the valve sleeve 4 and the outlet facing the front end of the valve sleeve 4.

[0038] In the initial water shut-off state, the valve stem 3 moves axially forward under the drive of the drive component 1, sealing the water outlet 22 with the seal 33 and pushing the valve sleeve 4 forward, where the sealing part 44 at the front end of the valve sleeve 4 seals the water outlet. At this time, no water flows out of the pipeline system, and the water in the pipeline flows into the balance chamber 5 through the groove 23 and the balance hole 21, maintaining a balance between the water pressure in the balance chamber 5 and at the pipeline inlet.

[0039] like Figure 8 As shown, when water is supplied, the valve sleeve 4 remains stationary initially. The driving component 1 drives the valve stem 3 to move axially backward, the sealing component 33 moves away from the convex ring 42, the water outlet 22 opens, and the water in the balance chamber 5 flows out to the water outlet. The water replenishment speed at the balance hole 21 is relatively slow, so the water pressure difference between the rear and front sides of the valve sleeve 4 decreases rapidly. Figure 9 As shown, after the valve stem 3 moves a certain distance, the front blocking part 34 abuts against the front end face of the valve sleeve 4, causing the valve sleeve 4 to move backward synchronously until the outlet is fully opened.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An electric valve core, comprising a drive member (1), a cylindrical valve core shell (2), a valve stem (3) passing through the valve core shell (2), and a valve sleeve (4), wherein the rear end of the valve stem (3) is connected to the drive member (1) and can reciprocate along its own axial direction under the drive of the drive member (1), and a balance cavity (5) is formed between the valve sleeve (4) and the valve core shell (2), the balance cavity (5) being connected to the outside of the valve core shell (2) through a balance hole (21), characterized in that, The valve sleeve (4) is cylindrical and sleeved on the outer side of the front end of the valve core shell (2). The inner side of the front end of the valve sleeve (4) has a protruding annular linkage part (41). The front end of the valve stem (3) is provided with a front blocking part (34) and a rear blocking part (39) arranged alternately. The linkage part (41) is engaged between the front blocking part (34) and the rear blocking part (39), and the axial thickness of the linkage part (41) is less than the distance between the front blocking part (34) and the rear blocking part (39). A sealing element (33) is also provided between the linkage part (41) and the rear blocking part (39). A water outlet hole (22) is formed between the linkage part (41) and the outer side of the valve stem (3), and the cross section of the water outlet hole (22) is... The area is larger than the cross-sectional area of ​​the balance hole (21). The outer side of the valve stem (3) has a recessed annular groove (35). The electric valve core also includes a long strip-shaped guide (6). The middle part of the guide (6) is bent into an annular shape and inserted into the groove (35). The end of the guide (6) passes through the valve core shell (2) axially, and a balance hole (21) is formed between the outer side of the guide (6) and the valve core shell (2). When water is supplied, the valve sleeve (4) does not move first. The driving member (1) drives the valve stem (3) to move axially backward. The water outlet (22) opens. After the valve stem (3) moves a certain distance, the front blocking part (34) abuts against the front end face of the valve sleeve (4) and drives the valve sleeve (4) to move backward synchronously.

2. The electric valve core according to claim 1, characterized in that, The front blocking part (34) includes a retaining ring, the inner side of which has several recessed clearance notches (34a), the distance between the bottom of the clearance notch (34a) and the center of the retaining ring being greater than the radius of the valve stem (3) opposite to the linkage part (41).

3. An electric valve core according to claim 1 or 2, characterized in that, The valve stem (3) and the valve sleeve (4) are in clearance fit. The rear end face of the linkage part (41) has a rearward protruding annular convex ring (42). The convex ring (42) is located near the inner hole of the linkage part (41) and a forward-recessed annular pressure-bearing groove (43) is formed on the outer side of the convex ring (42). The sealing member (33) can abut against the convex ring (42) and form a seal, and the outer edge of the sealing member (33) is opposite to the pressure-bearing groove (43).

4. An electric valve core according to claim 1 or 2, characterized in that, The outer side of the valve core shell (2) has a recessed annular groove (23). The port of the balance hole (21) located outside the balance cavity (5) is located on the groove wall in front of the groove (23). The rear end of the valve sleeve (4) can partially cover the groove opening of the groove (23). The outer diameter of the groove wall behind the groove (23) is larger than the outer diameter of the valve sleeve (4).

5. An electric valve core according to claim 1 or 2, characterized in that, The front end of the valve sleeve (4) has an annular sealing portion (44).

6. An electric valve core according to claim 1 or 2, characterized in that, The driving component (1) is a motor. The valve stem (3) includes a rod-shaped linkage rod (36) and a cylindrical limiting sleeve (37). The rear end of the limiting sleeve (37) is threaded to the output end of the driving component (1), and the front end of the limiting sleeve (37) is threaded to the outer side of the rear end of the linkage rod (36). The cross-section of the outer side of the limiting sleeve (37) is a regular hexagon. The inner side of the valve core shell (2) has a limiting section (24) with a regular hexagonal cross-section at the position corresponding to the limiting sleeve (37).

7. An electric valve core according to claim 6, characterized in that, The rear blocking part is located on the outside of the linkage rod in an annular shape. The outer side of the linkage rod (36) also has a recessed annular sealing groove (38). The rear blocking part (39) and the sealing groove (38) are arranged adjacent to each other and the rear blocking part (39) is located on the rear side of the sealing groove (38). The inner side of the sealing member (33) is inserted into the sealing groove (38) and the rear side of the sealing member (33) can abut against the rear blocking part (39). The front end of the limiting sleeve (37) is sleeved on the outside of the sealing member (33) and the outer side of the sealing member (33) abuts against the inner wall of the limiting sleeve (37).

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