A micro-control valve

Abstract

The present application relates to the technical field of control valves, and provides a micro-control valve, comprising: a magnetic component, a valve housing with an inner cavity, and a valve core component arranged in the inner cavity, wherein the first axial end of the valve housing forms a fluid inlet connected to the inner cavity, and the second axial end of the valve housing forms a fluid outlet connected to the inner cavity, and the valve core component moves in the inner cavity along the axial direction of the valve housing through the magnetic attraction of the magnetic component so that the fluid inlet and the fluid outlet are isolated from or connected to each other, and the micro-control valve does not need to be provided with a spring component, and the return is reliable, and it is not necessary to provide a rubber or other organic material seal, and the action resistance is small; it has the advantages of low processing precision, few components, and no leakage, etc. It solves the key contradiction between relying on mechanical elastic reset and moving part sealing loss.

Description

Technical Field

[0001] The present application relates to the technical field of control valves, and more specifically, to a micro-control valve. Background Art

[0002] Micro-control valves are often used in control pipelines with small flows. They have the advantages of low driving power, sensitive and reliable action, light weight, and easy maintenance. They can control flow valves with larger flows. The reset mechanism of micro-control valves in the prior art generally uses a spring or sheet rebound structure. Some moving parts need to be connected to an external electromagnetic coil, which will cause problems such as seal wear and leakage, and are prone to impact and damage related parts. Summary of the invention

[0003] The main purpose of the present invention is to provide a micro-control valve, aiming to solve the technical problems of the micro-control valve in the prior art, such as easily damaged parts, easy wear and poor sealing.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a micro-control valve, which includes:

[0005] A magnetic component, a valve housing having an inner cavity, and a valve core component arranged in the inner cavity, wherein the first axial end of the valve housing forms a fluid inlet connected to the inner cavity, and the second axial end of the valve housing forms a fluid outlet connected to the inner cavity, and the valve core component is magnetically attracted by the magnetic component to move in the inner cavity along the axial direction of the valve housing so that the fluid inlet and the fluid outlet are isolated from or connected to each other.

[0006] Further, the inner cavity is divided into a first cavity, a small-diameter cavity and a second cavity in sequence along a direction from the first axial end of the valve housing toward the second axial end of the valve housing, and the diameter of the small-diameter cavity is smaller than the diameters of the first cavity and the second cavity respectively;

[0007] The magnetic assembly includes a magnetic ring, and the micro-control valve includes a sealing ring. The sealing ring and the magnetic ring are installed in the second cavity in sequence along the direction from the second axial end of the valve housing toward the first axial end of the valve housing. The inner holes of the sealing ring and the magnetic ring are connected to the small-diameter cavity. When the valve core assembly blocks the inner hole of the sealing ring, the fluid inlet and the fluid outlet are isolated from each other. When the valve core assembly does not block the inner hole of the sealing ring, the fluid inlet and the fluid outlet are connected to each other.

[0008] Furthermore, the sealing ring is a copper ring.

[0009] Further, the valve core assembly includes a valve sleeve and a needle valve core, a valve sleeve cavity is formed inside the valve sleeve, the valve sleeve is movably installed in the first cavity along the axial direction of the valve housing and is sealed with the peripheral wall of the first cavity, the needle valve core is movably installed in the valve sleeve cavity along the axial direction of the valve housing, the first end of the needle valve core faces the fluid inlet, the second end of the needle valve core extends out of the valve sleeve and faces the fluid outlet, a valve core channel is provided inside the needle valve core, the first end of the needle valve core has a valve core port that connects the fluid inlet with the valve core channel, and the side wall of the second end of the needle valve core has a side through hole that connects the valve core channel with the outside of the needle valve core.

[0010] Furthermore, the magnetic assembly also includes a magnetic flux generating device, which is arranged at the first axial end of the valve housing. When the magnetic flux generating device does not generate magnetic flux, the valve kit and the needle valve core are magnetically attracted by the magnetic ring so that the second end of the needle valve core blocks the inner hole of the sealing ring. When the magnetic flux generating device generates magnetic flux, the valve kit and the needle valve core are magnetically attracted by the magnetic flux generating device and move away from the magnetic ring, so that the valve core channel is connected to the fluid outlet through the side through hole, the sealing ring and the inner holes of the magnetic ring.

[0011] Furthermore, the inner hole of the sealing ring has an inclined wall at the end facing the needle valve core, and the second end of the needle valve core forms a conical head. When the magnetic flux generating device does not generate magnetic flux, the conical head seals with the inclined wall to block the inner hole of the sealing ring.

[0012] Further, the first cavity forms a first buffer cavity between the valve sleeve and the small-diameter cavity, a piston portion is provided on the periphery of the needle valve core, the piston portion is accommodated in the valve sleeve cavity, the valve sleeve cavity forms a second buffer cavity on the side of the piston portion facing the fluid outlet, and the valve sleeve cavity forms a third buffer cavity on the side of the piston portion facing the fluid inlet.

[0013] Furthermore, the valve sleeve comprises a valve sleeve body and an end cover installed on the valve sleeve body, the valve sleeve body and the end cover together enclose the valve sleeve cavity, the valve sleeve body has a valve sleeve hole for the second end of the needle valve core to extend out, and the end cover has an end cover hole for the first end of the needle valve core to extend out.

[0014] Furthermore, the valve kit and the needle valve core are both magnetic parts.

[0015] Furthermore, the magnetic flux generating device comprises a U-shaped magnetic flux member arranged at the first axial end of the valve housing and a coil wound around the U-shaped magnetic flux member, and the first axial end of the valve housing is located in the notch of the U-shaped magnetic flux member.

[0016] The beneficial effects of the micro-control valve provided in this application are:

[0017] The micro-control valve provided by the present invention relies on the magnetic attraction of the magnetic component to move the valve core component in the inner cavity along the axial direction of the valve housing so that the fluid inlet and the fluid outlet are isolated from or connected to each other, so as to form the switch control of the micro-control valve, and does not require the provision of spring components, has reliable return, does not require the provision of organic material seals such as rubber, has small action resistance, has the advantages of low processing precision, few components, and no leakage, etc. The key contradiction between relying on mechanical elastic reset and moving part sealing loss is solved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 A cross-sectional view of a micro-control valve provided in accordance with an embodiment of the present application;

[0020] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 A three-dimensional view with a partially cut-away perspective of a micro-control valve provided by one embodiment of the present application;

[0022] Figure 4 A cross-sectional view of a micro-control valve in a completely closed state provided by one embodiment of the present application;

[0023] Figure 5 A cross-sectional view of a micro-control valve in an initial opening state provided by an embodiment of the present application;

[0024] Figure 6 A cross-sectional view of a micro-control valve provided in an embodiment of the present application in an open deceleration state;

[0025] Figure 7 A cross-sectional view of a micro-control valve in an opening acceleration state provided by an embodiment of the present application;

[0026] Figure 8 A cross-sectional view of a micro-control valve provided in an embodiment of the present application in a fully open state;

[0027] Fig. 9 A cross-sectional view of a micro-control valve provided in an embodiment of the present application in a power-off starting state;

[0028] Fig.10 A cross-sectional view of a micro-control valve in a decelerated closing state provided in one embodiment of the present application.

[0029] The reference numerals in the above drawings are as follows:

[0030] 1-magnetic ring; 2-sealing ring; 3-first buffer chamber; 4-second buffer chamber; 5-third buffer chamber; 6-first interface nut; 7-second interface nut; 21-inclined wall; 100-valve housing; 101-fluid inlet; 102-fluid outlet; 103-first chamber; 104-small-diameter chamber; 105-second chamber; 200-needle valve core; 201-valve core channel; 202-valve core port; 203-side through hole; 204-conical head; 205-piston part; 300-magnetic flux generating device; 301-U-shaped magnetic flux member; 302-coil; 303-coil housing; 400-valve kit; 401-valve sleeve body; 402-end cover. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0036] See also Figures 1 to 3 , an embodiment of the present invention provides a micro-control valve, comprising:

[0037] A magnetic component, a valve housing 100 having an inner cavity, and a valve core component arranged in the inner cavity, wherein the first axial end of the valve housing 100 forms a fluid inlet 101 connected to the inner cavity, and the second axial end of the valve housing 100 forms a fluid outlet 102 connected to the inner cavity, and the valve core component is magnetically attracted by the magnetic component and moves along the axial direction of the valve housing 100 in the inner cavity so that the fluid inlet 101 and the fluid outlet 102 are isolated from or connected to each other.

[0038] The micro-control valve provided by the present invention relies on the magnetic attraction of the magnetic component to move the valve core component in the inner cavity along the axial direction of the valve housing 100 so that the fluid inlet 101 and the fluid outlet 102 are isolated from or connected to each other, so as to form the switch control of the micro-control valve, and does not need to set a spring component, and the return is reliable, and it does not need to set an organic material seal such as rubber, and the action resistance is small; it has the advantages of low processing precision, few components, and no leakage. It solves the key contradiction between relying on mechanical elastic reset and moving part sealing loss.

[0039] According to one embodiment of the present invention, the inner cavity is divided into a first cavity 103, a small-diameter cavity 104, and a second cavity 105 in sequence along a direction from the first axial end of the valve housing 100 toward the second axial end of the valve housing 100, and the caliber of the small-diameter cavity 104 is smaller than the calibers of the first cavity 103 and the second cavity 105.

[0040] The magnetic assembly includes a magnetic ring 1, which is preferably a strong rubidium ferromagnetic ring with excellent magnetic attraction. The micro-control valve includes a sealing ring 2. The sealing ring 2 and the magnetic ring 1 are installed in the second cavity 105 in sequence along the direction from the axial second end of the valve housing 100 toward the axial first end of the valve housing 100. The inner holes of the sealing ring 2 and the magnetic ring 1 are connected to the small-diameter cavity 104.

[0041] In this embodiment, the sealing ring 2 is preferably a copper ring, especially a pure copper material. The on-off surface of the micro-control valve is a pure copper ring, which reduces the processing requirements of the sliding surface, so that the micro-control valve of the present invention can be made into a low-precision durable valve.

[0042] According to one embodiment of the present invention, the valve core assembly includes a valve kit 400 and a needle valve core 200. A valve sleeve cavity is formed inside the valve kit 400. The valve kit 400 is movably installed in the first cavity 103 along the axial direction of the valve housing 100 and is sealed with the peripheral wall of the first cavity 103. The needle valve core 200 is movably installed in the valve sleeve cavity along the axial direction of the valve housing 100. The first end of the needle valve core 200 faces the fluid inlet 101, and the second end of the needle valve core 200 extends out of the valve kit 400 and faces the fluid outlet 102. The needle valve core 200 has a valve core channel 201 inside, the first end of the needle valve core 200 has a valve core port 202 that connects the fluid inlet 101 with the valve core channel 201, and the side wall of the second end of the needle valve core 200 has a side through hole 203 that connects the valve core channel 201 with the outside of the needle valve core 200. The side through holes 203 are preferably multiple, so that when the valve kit 400 and the needle valve core 200 are magnetically attracted away from the magnetic ring 1 by the magnetic flux generating device 300, the fluid in the valve core channel 201 flows out of the needle valve core 200 from the multiple side through holes 203.

[0043] Preferably, the valve assembly 400 and the needle valve core 200 are both magnetic parts, which are convenient for being attracted by the magnetic assembly. However, even if the valve assembly 400 and the needle valve core 200 are not magnetic parts themselves, it is also possible to install magnetic parts.

[0044] According to one embodiment of the present invention, the magnetic assembly also includes a magnetic flux generating device 300, which is arranged at the first axial end of the valve housing 100. When the magnetic flux generating device 300 does not generate magnetic flux, the valve kit 400 and the needle valve core 200 are magnetically attracted by the magnetic ring 1 so that the second end of the needle valve core 200 blocks the inner hole of the sealing ring 2. When the magnetic flux generating device 300 generates magnetic flux, the valve kit 400 and the needle valve core 200 are magnetically attracted by the magnetic flux generating device 300 and move away from the magnetic ring 1, so that the valve core channel 201 is connected to the fluid outlet 102 through the side through hole 203, the sealing ring 2 and the inner holes of the magnetic ring 1.

[0045] According to a preferred embodiment of the present invention, the magnetic flux generating device 300 includes a U-shaped magnetic flux member 301 arranged at the first axial end of the valve housing 100 and a coil 302 wound around the U-shaped magnetic flux member 301 (for example, a U-shaped iron). A coil housing 303 can be installed outside the coil 302 to protect and seal the coil 302. The first axial end of the valve housing 100 is located in the notch of the U-shaped magnetic flux member 301. When the coil 302 is energized, the U-shaped iron becomes an electromagnet.

[0046] According to one embodiment of the present invention, the end of the inner hole of the sealing ring 2 facing the needle valve core 200 has an inclined wall 21, and the second end of the needle valve core 200 forms a conical head 204. When the magnetic flux generating device 300 does not generate magnetic flux, the conical head 204 is sealed with the inclined wall 21 so that the conical head 204 blocks the inner hole of the sealing ring 2. The conical head 204 is sealed with the inclined wall 21, which is equivalent to the conical head 204 being matched with the conical surface to form a tight and reliable sealing fit.

[0047] According to one embodiment of the present invention, the first cavity 103 forms a first buffer cavity 3 between the valve kit 400 and the small-diameter cavity 104, a piston portion 205 is arranged on the periphery of the needle valve core 200, and the piston portion 205 is accommodated in the valve sleeve cavity, the valve sleeve cavity forms a second buffer cavity 4 on the side of the piston portion 205 facing the fluid outlet 102, and the valve sleeve cavity forms a third buffer cavity 5 on the side of the piston portion 205 facing the fluid inlet 101. Since the first buffer cavity 3, the second buffer cavity 4 and the third buffer cavity 5 are provided, a buffering effect can be formed during the movement of the needle valve core 200 and the valve kit 400, thereby greatly protecting the corresponding components in the micro-control valve from collision and wear. The buffering details of the first buffer cavity 3, the second buffer cavity 4 and the third buffer cavity 5 will be introduced in more detail below.

[0048] According to one embodiment of the present invention, the valve kit 400 includes a valve sleeve body 401 and an end cover 402 installed on the valve sleeve body 401. The valve sleeve body 401 and the end cover 402 together enclose a valve sleeve cavity. The valve sleeve body 401 has a valve sleeve hole for the second end of the needle valve core 200 to extend out, and the end cover 402 has an end cover hole for the first end of the needle valve core 200 to extend out. The end cover 402 is preferably connected to the valve sleeve body 401 in a threaded manner. Of course, it is also possible to connect the end cover 402 to the valve sleeve body 401 in other detachable ways.

[0049] According to one embodiment of the present invention, the micro-control valve also includes a first interface nut 6 threadedly connected to the fluid inlet 101 and a second interface nut 7 threadedly connected to the fluid outlet 102. Specifically, both ends of the first interface nut 6 have external threads, the external thread of one end of the first interface nut 6 is connected to the internal thread of the fluid inlet 101, and the external thread of the other end of the first interface nut 6 is used to connect other pipe fittings, and both ends of the second interface nut 7 have external threads, the external thread of one end of the second interface nut 7 is connected to the internal thread of the fluid outlet 102, and the external thread of the other end of the second interface nut 7 is used to connect other pipe fittings.

[0050] The working principle of the micro-control valve provided by the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings (for ease of understanding, according to the orientation diagram in the accompanying drawings, the first axial end of the valve housing 100 can be called the right end, and the second axial end of the valve housing 100 can be called the left end):

[0051] See also Figure 4 , the micro-control valve is in a completely closed state: the fluid medium at the right end enters the inner cavity of the valve housing 100 from the fluid inlet 101, and the fluid pressure simultaneously pushes the needle valve core 200 and the valve kit 400, the volume of the first buffer cavity 3 is compressed to a minimum, the conical head 204 of the needle valve core 200 presses the copper ring tightly, and at the same time the strong rubidium ferromagnetic ring attracts the needle valve core 200, the inner cavity of the micro-control valve is closed, and the fluid medium in the inner cavity cannot flow to the fluid outlet 102.

[0052] See also Figure 5 , the micro-control valve is initially opened: after the U-shaped iron is powered on, the U-shaped iron generates magnetic flux attraction to overcome the medium pressure and the attraction of the strong rubidium ferromagnetic ring, acting on the valve core assembly to move to the right end, and a small amount of medium fluid in the valve core channel 201 enters the inner hole of the strong rubidium ferromagnetic ring and the copper ring through the side through hole 203 of the needle valve core 200 to the fluid outlet 102. Since the space of the first buffer chamber 3 cannot expand rapidly, the movement speed of the valve core assembly is limited.

[0053] See also Figure 6 , the micro-control valve is in the deceleration state when it is opened: the valve core assembly is subject to the increase of electromagnetic suction and continues to move to the right. The volume of the first buffer chamber 3 increases and the pressure therein continues to decrease, which hinders the acceleration of the valve core assembly. At the same time, the second buffer chamber 4 cannot expand rapidly, and the third buffer chamber 5 cannot be compressed rapidly. The needle valve core 200 is limited to a rightward movement speed, and a small amount of medium fluid in the valve core channel 201 continues to flow from the fluid inlet 101 to the fluid outlet 102.

[0054] See also Figure 7 , the micro-control valve opens in an accelerated state: the medium fluid in the valve core channel 201 enters the first buffer chamber 3 from the side through hole 203 of the needle valve core 200, the negative pressure in this space disappears, and the valve core assembly accelerates to move to the right end. At the same time, the needle valve core 200 is separated from the small-diameter cavity 104, and the medium fluid channel is opened to a greater extent.

[0055] See also Figure 8 , the micro-control valve is in the fully open state: the valve core assembly moves to the right limit position, at this time the electromagnetic suction force is the largest, the valve core assembly position is maintained, the medium fluid all flows through the valve core channel 201, the side hole, the strong rubidium ferromagnetic ring and the inner hole of the copper ring to the fluid outlet 102 and is released from the fluid outlet 102, the volume of the second buffer chamber 4 is compressed to the minimum, and the volume of the third buffer chamber 5 is maintained to the maximum. When the right end pressure jumps, the second buffer chamber 4 and the third buffer chamber 5 can eliminate the left and right vibration of the needle valve core 200.

[0056] See also Fig. 9 , the micro-control valve power-off starting state: when it is necessary to control the shutdown, the electromagnet is first de-energized, and the medium fluid entering from the fluid inlet 101 pushes the valve core assembly to move quickly to the left until it approaches the small-diameter port.

[0057] See also Fig.10 , the micro-control valve is in the deceleration closing state: after the fluid entering from the fluid inlet 101 pushes the needle valve core 200 to the left and enters the small-diameter port, the first buffer chamber 3 is compressed, the pressure increases, and acts on the valve core assembly to decelerate. Then, the needle valve core 200 continues to move left, the second buffer chamber 4 is compressed, and the pressure in the second buffer chamber 4 increases; the third buffer chamber 5 generates negative pressure, and the pressure in the second buffer chamber 4 and the negative pressure in the third buffer chamber 5 act together on the needle valve core 200, generating a reaction force pointing to the right end, and the needle valve core 200 is limited to a low speed. Finally, the needle valve core 200 contacts the inner hole of the copper ring to form a conical seal, and the medium channel is completely closed. When the pressure decreases, the strong neodymium ferromagnetic ring 1 attracts the needle valve core 200 to maintain the conical seal.

[0058] The entire control process is completed in the following steps: fully shut down → initial opening → opening deceleration → opening acceleration → opening deceleration → fully open → (power on and hold) → power off starting point → deceleration and closing → fully shut down. The action switch mechanism uses magnetic force to move in a cylindrical closed cavity. The first buffer chamber 3, the second buffer chamber 4 and the third buffer chamber 5 always act in the opposite direction to the movement direction of the needle valve core 200, effectively preventing collision, avoiding damage to the action components, and protecting the integrity of the cone seal.

[0059] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A micro-control valve, characterized in that: include: A magnetic component, a valve housing having an inner cavity, and a valve core component disposed in the inner cavity, wherein a first axial end of the valve housing forms a fluid inlet communicating with the inner cavity, and a second axial end of the valve housing forms a fluid outlet communicating with the inner cavity, and the valve core component is magnetically attracted by the magnetic component to move in the inner cavity along the axial direction of the valve housing so that the fluid inlet and the fluid outlet are isolated from or communicated with each other; The inner cavity is divided into a first cavity, a small-diameter cavity and a second cavity in sequence along a direction from the first axial end of the valve housing toward the second axial end of the valve housing, and the diameter of the small-diameter cavity is smaller than the diameters of the first cavity and the second cavity respectively; The valve core assembly includes a valve sleeve and a needle valve core, a valve sleeve cavity is formed inside the valve sleeve, the valve sleeve is movably installed in the first cavity along the axial direction of the valve housing and is sealed with the peripheral wall of the first cavity, the needle valve core is movably installed in the valve sleeve cavity along the axial direction of the valve housing, the first end of the needle valve core faces the fluid inlet, the second end of the needle valve core extends out of the valve sleeve and faces the fluid outlet, a valve core channel is provided inside the needle valve core, the first end of the needle valve core has a valve core port that connects the fluid inlet with the valve core channel, and the side wall of the second end of the needle valve core has a side through hole that connects the valve core channel with the outside of the needle valve core.

2. The micro-control valve according to claim 1, characterized in that: The magnetic assembly includes a magnetic ring, and the micro-control valve includes a sealing ring. The sealing ring and the magnetic ring are installed in the second cavity in sequence along the direction from the second axial end of the valve housing toward the first axial end of the valve housing. The inner holes of the sealing ring and the magnetic ring are connected to the small-diameter cavity. When the valve core assembly blocks the inner hole of the sealing ring, the fluid inlet and the fluid outlet are isolated from each other. When the valve core assembly does not block the inner hole of the sealing ring, the fluid inlet and the fluid outlet are connected to each other.

3. The micro-control valve according to claim 2, characterized in that: The sealing ring is a copper ring.

4. The micro-control valve according to claim 2, characterized in that: The magnetic assembly also includes a magnetic flux generating device, which is arranged at the first axial end of the valve housing. When the magnetic flux generating device does not generate magnetic flux, the valve kit and the needle valve core are magnetically attracted by the magnetic ring so that the second end of the needle valve core blocks the inner hole of the sealing ring. When the magnetic flux generating device generates magnetic flux, the valve kit and the needle valve core are magnetically attracted by the magnetic flux generating device and move away from the magnetic ring, so that the valve core channel is connected to the fluid outlet through the side through hole, the sealing ring and the inner holes of the magnetic ring.

5. The micro-control valve according to claim 4, characterized in that: The inner hole of the sealing ring has an inclined wall at the end facing the needle valve core, and the second end of the needle valve core forms a conical head. When the magnetic flux generating device does not generate magnetic flux, the conical head seals with the inclined wall to block the inner hole of the sealing ring.

6. The micro-control valve according to claim 1, characterized in that: The first cavity forms a first buffer cavity between the valve sleeve and the small-diameter cavity, a piston portion is provided on the periphery of the needle valve core, the piston portion is accommodated in the valve sleeve cavity, the valve sleeve cavity forms a second buffer cavity on the side of the piston portion facing the fluid outlet, and the valve sleeve cavity forms a third buffer cavity on the side of the piston portion facing the fluid inlet.

7. The micro-control valve according to claim 1, characterized in that: The valve kit comprises a valve sleeve body and an end cover mounted on the valve sleeve body, wherein the valve sleeve body and the end cover together enclose the valve sleeve cavity, the valve sleeve body is provided with a valve sleeve hole for the second end of the needle valve core to extend out, and the end cover is provided with an end cover hole for the first end of the needle valve core to extend out.

8. The micro-control valve according to claim 1, characterized in that: The valve set and the needle valve core are both magnetic parts.

9. The micro-control valve according to claim 4, characterized in that: The magnetic flux generating device comprises a U-shaped magnetic flux member arranged at the first axial end of the valve housing and a coil wound around the U-shaped magnetic flux member. The first axial end of the valve housing is located in the notch of the U-shaped magnetic flux member.

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