Electromagnetic valve element assembly and electromagnetic valve thereof

Abstract

The invention discloses an electromagnetic valve element assembly and an electromagnetic valve thereof, and relates to the technical field of electromagnetic valves, a first spring, a first movable iron core, a second spring and a second movable iron core are sequentially arranged in a valve element sleeve in the axial direction, the first spring abuts against the first movable iron core to form downward elastic force on the first movable iron core, and the second spring forms downward elastic force on the second movable iron core; under the action of the axial sliding limiting matching structure, the second movable iron core can only move in the axial direction in the sliding stroke relative to the first movable iron core, and one-way axial linkage is formed when the second movable iron core moves downwards relative to the first movable iron core to the end point position. And the first movable iron core continuously moves upwards to drive the second movable iron core to move synchronously. By means of the arrangement, starting force of the electromagnetic valve is improved, and meanwhile power-on protection measures for normal work of the electromagnetic valve under the condition that the reset spring fails or the movable iron core fails are added.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a solenoid valve core assembly and a solenoid valve thereof. Background Art

[0002] Solenoid valves are widely used in the automatic control of water circuits, gas circuits, oil circuits, etc. They usually include a coil assembly, a stationary iron core, a moving iron core, an abutting spring, a return spring, a sealing piston, etc. The magnetic force generated by the energized coil attracts the moving iron core and the sealing piston to move upward, overcoming the spring force and the self-gravity of the moving iron core to open the valve port. When powered off, the sealing piston is driven by the return spring force to close the valve port.

[0003] The existing solenoid valves have insufficient opening force and require a relatively high electric quantity for the electromagnetic coil. In addition, once the spring gets stuck, the solenoid valve may not be able to open normally. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies existing in the prior art and provide a solenoid valve core assembly and a solenoid valve thereof.

[0005] The technical solution adopted by the present invention is as follows: It includes a coil assembly and a valve core assembly;

[0006] The valve core assembly includes a valve core sleeve. The valve core sleeve is provided with a valve core cavity. Inside the valve core cavity, a first spring, a first moving iron core, a second spring, and a second moving iron core are sequentially arranged along the axial direction. The first spring has a fixed end and a movable end. The fixed end is axially fixed relative to the valve core sleeve, and the movable end abuts against the first moving iron core to form a downward elastic force on it. The second spring is arranged between the first moving iron core and the second moving iron core and forms a downward elastic force on the second moving iron core;

[0007] The coil assembly is sleeved outside the valve core sleeve. When the coil assembly is energized, the first moving iron core and the second moving iron core are subjected to an upward electromagnetic force;

[0008] An axial sliding limit and cooperation structure is provided between the first moving iron core and the second moving iron core. Under the action of the axial sliding limit and cooperation structure, the second moving iron core can only move axially within the sliding stroke relative to the first moving iron core. When the second moving iron core moves downward to the end position relative to the first moving iron core, a one-way axial linkage is formed, so that when the first moving iron core moves upward continuously, it can drive the second moving iron core to move synchronously.

[0009] Preferably, the axial sliding limit and cooperation structure includes a sheath sleeved outside the second moving iron core. The sheath forms an axial linkage cooperation with the first moving iron core. A mutually cooperating block and groove are provided between the sheath and the second moving iron core. The axial width of the groove is greater than the axial width of the block, so that the block is limited in the groove and a relative sliding stroke between the two is formed.

[0010] Preferably, the first moving iron core includes a first moving iron core body and a first connecting portion connected to the lower end of the first moving iron core body. The upper end of the sheath is sleeved on the outer periphery of the first connecting portion. A first convex ring is provided on the inner periphery of the sheath, and a first annular card slot is provided on the outer periphery of the first connecting portion. The first convex ring is in snap-fit with the first annular card slot to enable axial linkage and cooperation between the sheath and the first moving iron core.

[0011] Preferably, the outer diameter of the first moving iron core body is greater than the outer diameter of the first connecting portion, and the outer diameter of the sheath is adapted to the outer diameter of the first moving iron core body and is also adapted to the inner diameter of the valve core sleeve.

[0012] Preferably, one of the clamping block and the card slot is a second convex ring protruding inside the sheath, and the other is an annular groove provided on the outer periphery of the second moving iron core.

[0013] A first guiding conical surface is formed at the upper end of the clamping block, and a second guiding conical surface is formed on a part of the outer periphery of the second moving iron core below the card slot.

[0014] Preferably, the sheath is provided with a first small hole corresponding to the position between the second moving iron core and the first moving iron core and a second small hole corresponding to the position below the second moving iron core. The second moving iron core is communicated with the valve core cavity.

[0015] Preferably, a groove for placing the first spring is provided at the upper end of the first moving iron core, and a counterbore for placing the second spring is provided on the second moving iron core.

[0016] Preferably, a fixing block for fixing the fixed end position of the first spring is provided at the top end of the valve core assembly.

[0017] Preferably, the valve core assembly further includes a sealing piston disposed at a position facing the valve port, and the sealing piston is in linkage cooperation with the second moving iron core.

[0018] Preferably, it includes a valve body, and an electromagnetic valve core assembly is disposed on the valve body.

[0019] The beneficial effects of the present invention are as follows: The electromagnetic valve core assembly and the electromagnetic valve of the present invention improve the starting force of the electromagnetic valve through the cooperation of a double-spring structure and a double moving iron core. At the same time, an axial sliding limit cooperation structure is adopted to enable the electromagnetic valve to work normally when the spring is stuck. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present invention.

[0021] Figure 1 is a schematic structural view of the solenoid valve core assembly of the present invention;

[0022] Figure 2 is Figure 1 a sectional view of;

[0023] Figure 3 is a schematic structural view of the solenoid valve core assembly of the present invention with the coil assembly removed;

[0024] Figure 4 is Figure 3 an exploded view of;

[0025] Figure 5 is the present invention in the power-off state Figure 3 a sectional view of;

[0026] Figure 6 In (a) is a sectional view of the coil assembly of the present invention when energized and in states 1 and 3, Figure 3 and (b) is a sectional view of the coil assembly of the present invention when energized and when the second spring and the second moving iron core cannot move; Figure 3 a sectional view of;

[0027] Figure 7 In (a) is a schematic structural view of the sheath, and (b) is a sectional view of the sheath;

[0028] Figure 8 is a schematic structural view of the present invention;

[0029] Figure 9 is an exploded view of the present invention;

[0030] Figure 10 In (a) is a schematic structural view of the water retaining plate, and (b) is a top view of the water retaining plate;

[0031] In the figure, 1 - valve core sleeve, 11 - first spring, 12 - first moving iron core, 13 - second spring, 14 - second moving iron core, 15 - fixing block, 111 - end point position, 121 - groove, 122 - first annular clamping groove, 123 - first moving iron core body, 124 - first connecting portion, 142 - clamping groove, 141 - counterbore;

[0032] 2 - sheath, 21 - first convex ring, 22 - clamping block, 23 - first small hole; 221 - first guiding conical surface, 222 - second guiding conical surface;

[0033] 31 - first coil, 32 - second coil, 4 - sealing piston, 6 - valve body, 61 - valve port;

[0034] 5 - diaphragm, 51 - sealing ring, 52 - water retaining plate, 521 - balance hole, 522 - pressure relief hole;

[0035] 7 - Coil assembly, 8 - Spool valve assembly; Detailed implementation mode

[0036] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are used to distinguish two entities or parameters with the same name but different, so it can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be repeated in the subsequent embodiments.

[0038] The directional and positional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only with reference to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are for explaining and understanding the present invention, rather than a limitation on the protection scope of the present invention.

[0039] The following further describes the present application in detail with reference to the attached Figure 1 - attached Figure 10 Drawings.

[0040] Embodiment 1

[0041] An embodiment of the present application discloses a solenoid valve spool assembly, which is arranged in a solenoid valve to control the opening and closing of the valve port 61 of the solenoid valve.

[0042] The solenoid valve spool assembly includes a coil assembly 7 and a spool valve assembly 8; the spool valve assembly 8 includes a spool valve sleeve 1 and a sheath 2. The spool valve sleeve 1 is provided with a spool valve cavity. In the spool valve cavity, a first spring 11, a first moving iron core 12, a second spring 13, and a second moving iron core 14 are sequentially arranged along the axial direction. The first spring 11 has a fixed end and a movable end. The fixed end is axially fixed relative to the spool valve sleeve 1, and the movable end abuts against the upper end of the first moving iron core 12 and its upper end is connected to the lower end of the first spool valve 12, forming a downward elastic force on it. The second spring 13 is arranged between the first moving iron core 12 and the second moving iron core 14 and forms a downward elastic force on the second moving iron core 14;

[0043] The coil assembly 7 is sleeved outside the spool valve sleeve 1. When the coil assembly 7 is energized, the first moving iron core 12 and the second moving iron core 14 are subjected to an upward electromagnetic force;

[0044] It can be understood that when the coil assembly 7 is energized, both the first moving iron core 12 and the second moving iron core 14 are subject to electromagnetic forces. Since the magnetic poles of the mating surfaces of the first moving iron core 12 and the second moving iron core 14 are opposite, the first moving iron core 12 has a suction force on the second moving iron core 14. When the first moving iron core 12 and the second moving iron core 14 are attracted and combined, the first moving iron core 12 and the second moving iron core 14 move together. At the same time, the first moving iron core 12 compresses the first spring 11 and the second moving iron core 14 compresses the second spring 13. The first spring 11 and the second spring 13 have elastic forces, but the electromagnetic force is greater than the elastic force.

[0045] When the coil assembly 7 is powered off after being powered on, the electromagnetic forces of the first moving iron core 12 and the second moving iron core 14 disappear. The first spring 11 has a downward elastic force on the first moving iron core 12 and the second spring 13 has a downward elastic force on the second moving iron core 14, causing the first moving iron core 12 and the second moving iron core 14 to move downward to close the valve port 61.

[0046] With the above settings, when the first moving iron core 12 and the second moving iron core 14 are attracted and combined, only a relatively small current needs to be applied to the coil assembly 7 to maintain the attracted state at this time. This can reduce the power consumption of the solenoid valve, save electrical energy, and also reduce damage to the coil assembly 7; the double-spring structure is set to prevent the weakening of the elastic characteristics of the spring, improve the poor action force difference between the conventional coil single valve core / spring, poor starting performance, and increase the magnetic field strength to enhance the starting force.

[0047] An axially sliding limit fitting structure is provided between the first moving iron core 12 and the second moving iron core 14. Under the action of the axially sliding limit fitting structure, the second moving iron core 14 can only move axially within the sliding stroke relative to the first moving iron core 12. When the second moving iron core 14 moves downward relative to the first moving iron core 12 to the end point position 111, a one-way axial linkage is formed, so that the upward movement of the first moving iron core 12 can drive the second moving iron core 14 to move synchronously.

[0048] It can be understood that the end point position 111 is the position when the upper end surface of the block 22 contacts the upper end surface of the card slot 142. When the first spring 11 and the second spring 13 are compressed beyond their elastic limits, plastic deformation will occur and they will lose the ability to restore their shapes. At the same time, they may also be stuck by foreign objects and unable to move. When the first spring 11 or the second spring 13 undergoes plastic deformation, it is called state 1. When the second spring 13 or the second moving iron core 14 cannot move, it is called state 2. Under normal conditions, it is called state 3.

[0049] Figure 6 In (a), it is a schematic diagram of the energized state of state 1 and state 3. Figure 6 In (b), it is a schematic diagram of the energized state of state 2. Figure 5 It is a schematic diagram of the powered-off state.

[0050] AsFigure 5 As shown, when the coil assembly 7 is powered off, the first spring 11 presses the first moving iron core 12 downward. The valve core 1 and the sheath 2 are in a mating structure. The second spring 13 presses the second moving iron core 14 and the sealing piston 4 downward against the middle hole of the water blocking plate 52 to close the valve port 61.

[0051] As Figure 6 shown in (a) therein, when the valve core assembly 8 is in states 1 and 3 and the coil assembly 7 is powered on, the first moving iron core 12 and the second moving iron core 14 are simultaneously subjected to electromagnetic forces. While the first moving iron core 12 drives the second moving iron core 14 to move through the axial sliding limit fitting structure, the second moving iron core 14 moves upward relative to the first moving iron core 12. When the first moving iron core 12 and the second moving iron core 14 are attracted and combined, after the attraction and combination, the first moving iron core 12 and the second moving iron core 14 move upward together.

[0052] As Figure 6 shown in (b) therein, when the valve core assembly 8 is in state 2 and the coil assembly 7 is powered on, the first moving iron core 12 and the second moving iron core 14 are simultaneously subjected to electromagnetic forces. Since the second moving iron core 14 cannot move when the second spring 13 is stuck, when the second moving iron core 14 moves downward relative to the first moving iron core 12 to the end position 111, the sheath 2 and the second moving iron core 14 are relatively stationary, and the first moving iron core 12 drives the sheath 2 to move upward to open the valve port 61.

[0053] Through the above settings, the present invention can complete the opening and closing of the valve port 61 in any of the above situations. The protection measures are increased to ensure that the solenoid valve can be opened when powered on, avoiding the problem that the valve core assembly 8 cannot work properly due to mistakes in the second moving iron core 14 or the second spring 13.

[0054] The axial sliding limit fitting structure includes a sheath 2 sleeved outside the second moving iron core 14. The sheath 2 forms an axial linkage fit with the first moving iron core 12. A cooperating block 22 and a slot 142 are provided between the sheath 2 and the second moving iron core 14. The axial width of the slot 142 is greater than the axial width of the block 22 so that the block 22 forms a sliding stroke in the slot 142. It can be understood that the cooperation of the block 22 and the slot 142 enables the second moving iron core 14 to drive the first moving iron core 12 to move downward when powered off. At the same time, in the powered-off state, the lower end surface of the block 22 abuts against the lower end surface of the slot 142, reducing the overall force of the valve core assembly 8 acting on the valve port 61 and increasing the service life of the solenoid valve.

[0055] The first moving iron core 12 includes a first moving iron core body 123 and a first connecting portion 124 connected to the lower end of the first moving iron core body 123. The upper end of the sheath 2 is sleeved on the outer periphery of the first connecting portion 124. A first convex ring 21 is provided on the inner periphery of the sheath 2, and a first annular card slot 122 is provided on the outer periphery of the first connecting portion 124. The first convex ring 21 and the first annular card slot 122 are in snap-fit cooperation to enable the axial linkage cooperation between the sheath 2 and the first moving iron core 12.

[0056] The outer diameter of the first moving iron core body 123 is larger than the outer diameter of the first connecting portion 124. The outer diameter of the sheath 2 is adapted to the outer diameter of the first moving iron core body 123 and is also adapted to the inner diameter of the valve core sleeve 1. It can be understood that there is a small gap between the sheath 2 and the first moving iron core 12 and the valve core sleeve 1 to prevent the sheath 2 and the first moving iron core 12 from moving up and down in the valve core sleeve 1 without being hindered.

[0057] One of the clamping block 22 and the clamping slot 142 is a second convex ring protruding inside the sheath 2, and the other is an annular groove provided on the outer periphery of the second moving iron core 14. It can be understood that, firstly, the clamping block 22 is provided on the sheath 2 and the clamping slot 142 is provided on the second moving iron core 14; secondly, the clamping block 22 is provided on the second moving iron core 14 and the clamping slot 142 is provided on the sheath 2.

[0058] The upper end of the clamping block 22 forms a first guiding conical surface 221, and a second guiding conical surface 222 is formed on a part of the outer periphery of the second moving iron core 14 below the clamping slot 142. It can be understood that the first guiding conical surface 221 increases the contact area between the clamping slot 142 and the clamping block 22, reducing the pressure to protect the clamping block 22 and the clamping slot 142; the second guiding conical surface 222 facilitates installation.

[0059] The sheath 2 is provided with a first small hole 23 corresponding to the position between the second moving iron core 14 and the first moving iron core 12 and a second small hole 24 corresponding to the position below the second moving iron core 14. The second moving iron core 14 communicates with the valve core cavity. It can be understood that when the power is off, there is an upward resistance on the valve core assembly 8 to prevent the valve core assembly 8 from moving downward. The first spring 11 and the second spring 13 have downward elastic forces, and the elastic forces are less than the resistance, resulting in the valve core assembly 8 being unable to move downward and the valve port 61 being unable to be closed; gas can flow into the valve core assembly 8 through the first small hole 23 and the second small hole 24, the air pressure increases, and the pressure effect and the elastic forces of the first spring 11 and the second spring 13 can move the valve core assembly 8 downward to close the valve port 61.

[0060] The upper end of the first moving iron core 12 is provided with a groove 121, and the movable end of the first spring 11 is in contact with the first moving iron core 12 in cooperation with the groove 121; the upper end of the second moving iron core 14 is provided with a counterbore 141 for placing the second spring 13.

[0061] A fixing block 15 for fixing the fixed end position of the first spring 11 is provided at the top of the valve core sleeve 1; it can be understood that the fixing block 15 plays a role in fixing the position of the first spring 11 at the fixed end, and the use effect is good.

[0062] The valve core assembly 8 further includes a sealing piston 4, and the piston is arranged at the lower end of the second moving iron core 14 and the second moving iron core 14 is embedded in the sealing piston 4; it can be understood that at the position where the sealing piston 4 faces the valve port 61, the sealing piston 4 moves up and down following the second moving iron core 14, opening the valve port 61 when moving upward and closing the valve port 61 when moving upward.

[0063] Embodiment 2

[0064] This embodiment provides a solenoid valve, including a valve body 6, the valve body 6 includes a fluid inlet part 62 and a fluid outlet part 63, and the solenoid valve core assembly 8 in Embodiment 1 is arranged on the valve body 6.

[0065] The fluid inlet part 62 and the fluid outlet part 63 are communicated with the cavity at the lower end of the valve core sleeve 1 in Embodiment 1, and the upper end of the fluid outlet part 63 is the valve port 61 in Embodiment 1.

[0066] A sealing structure is provided at the upper end of the valve port 61, and a balance hole 521 and a pressure relief hole 522 are provided on the sealing structure; it can be understood that this sealing structure is applicable to small-diameter solenoid valves, and this valve core can also be applicable to large-diameter solenoid valves. For large-diameter solenoid valves, this sealing structure is not required.

[0067] The sealing structure is a diaphragm 5, the diaphragm 5 includes a sealing ring 51 and a water retaining plate 52, the sealing ring 51 is connected to the water retaining plate 52, the sealing ring 51 is arranged at the upper end openings of the fluid inlet part 62 and the fluid outlet part 63, the water retaining plate 52 is arranged at the valve port 61, and the lower part of the water retaining plate 52 abuts against the inner side of the valve port 61.

[0068] The water retaining plate 52 is provided with a balance hole 521 and a pressure relief hole 522. It can be understood that when the valve port 61 is opened, the electromagnetic force lifts the sealing piston 4 connected to the water retaining plate 52, and the pressure in the valve core sleeve 1 quickly flows out through the pressure relief hole 522. Because the diameter of the pressure relief hole 522 is larger than the diameter of the balance hole 521, the pressure relief speed is greater than the speed of the pressure entering the upper cavity through the balance hole 521, so the diaphragm 5 is opened and the fluid passes through. When the power is off, the pressure relief hole 522 is blocked by the sealing piston, and the inlet fluid reaches the upper cavity of the diaphragm 5 through the balance hole 521 at the edge from the lower cavity of the diaphragm 5, and the pressure in the upper cavity increases. At this time, the sealing ring 51 of the diaphragm 5 is tightly combined with the valve port 61.

[0069] In this embodiment, the diaphragm 5 is applied to a water-using solenoid valve, and other components are further connected to the lower end of the valve core assembly 8 for other types of solenoid valves.

[0070] The coil assembly 7 has a coil at the positions corresponding to the first moving iron core 12 and the second moving iron core 14, which are the first coil 31 and the second coil 32 respectively. It can be understood that when energized, a relatively large attracting current passes through the first coil 31 and the second coil 32. If the winding directions of the first coil 31 and the second coil 32 are the same as the current flow directions, that is, the magnetism generated on the first moving iron core 12 and the second moving iron core 14 is in the same direction, and the magnetic poles of the mutually cooperating surfaces of the first moving iron core 12 and the second moving iron core 14 are opposite. According to the attraction of opposite magnetic poles, the magnetic forces generated by the first coil 31 and the second coil 32 are superimposed, and the second moving iron core 14 moves along the valve core sleeve 1 and attracts the first moving iron core 12, driving the sealing piston 4 to compress the spring and causing the sealing piston 4 to disengage from the valve port 61. After the first moving iron core 12 and the second moving iron core 14 are attracted, only a very small holding current needs to be applied to maintain the attracted state. According to the above logic, the winding methods and current flow directions of the first coil 31 and the second coil 32 can be combined and matched.

[0071] The working process of a solenoid valve according to an embodiment of the present application is as follows: when energized, the electromagnetic forces generated on the first moving iron core 12 and the second moving iron core 14 push the valve core assembly 8 to move axially, driving the sealing piston 4 to compress the spring, and causing the sealing piston 4 to disengage from the valve port 61; when there is a problem with the second moving iron core 14, the first moving iron core 12 can drive the valve core assembly 8 to move axially.

[0072] After power-off, the elastic forces of the first spring 11 and the second spring 13 drive the sealing piston 4 to move towards the valve port 61. When the second moving iron core 14 moves towards the valve port 61 to a certain position and stops moving, at this time, the sealing piston 4 abuts against the valve port 61 to close the valve port 61. At the same time, the latch 22 shares a part of the force of the valve core assembly 8 on the valve port 61, reducing the pressure on the valve port 61 and enhancing the utilization rate.

[0073] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A solenoid valve core assembly, characterized in that: Including coil assembly and valve core assembly; The valve core assembly comprises a valve core sleeve (1), the valve core sleeve (1) is provided with a valve core cavity, a first spring (11), a first moving iron core (12), a second spring (13) and a second moving iron core (14) are arranged in sequence along the axial direction in the valve core cavity, the first spring (11) has a fixed end and a movable end, the fixed end is fixed in an axial position relative to the valve core sleeve (1), the movable end abuts against the first moving iron core (12) to form a downward elastic force on the first moving iron core (12), and the second spring (13) is arranged between the first moving iron core (12) and the second moving iron core (14) and forms a downward elastic force on the second moving iron core (14); The coil assembly is sleeved outside the valve core sleeve (1), and when the coil assembly is energized, the first moving iron core (12) and the second moving iron core (14) are subjected to an electromagnetic force in an upward direction; An axial sliding limit matching structure is provided between the first moving iron core (12) and the second moving iron core (14). Under the action of the axial sliding limit matching structure, the second moving iron core (14) can only move axially within a sliding stroke relative to the first moving iron core (12), and when the second moving iron core (14) moves downward to an end position relative to the first moving iron core (12), a one-way axial linkage is formed, so that the first moving iron core (12) continues to move upward to drive the second moving iron core (14) to move synchronously.

2. The solenoid valve core assembly according to claim 1, characterized in that: The axial sliding limiting matching structure comprises a sleeve (2) sleeved outside the second moving iron core (14), the sleeve (2) and the first moving iron core (12) forming an axial linkage match, a mutually matching clamping block (22) and a clamping groove (142) are provided between the sleeve (2) and the second moving iron core (14), the axial width of the clamping groove (142) being greater than the axial width of the clamping block (22), so that the clamping block (22) is limited in the clamping groove (142) and a relative sliding stroke between the two is formed.

3. The solenoid valve core assembly according to claim 2, characterized in that: The first moving iron core (12) comprises a first moving iron core body (123) and a first connecting portion (124) connected to the lower end of the first moving iron core body (123); the upper end of the sleeve (2) is sleeved on the outer periphery of the first connecting portion (124); the inner periphery of the sleeve (2) is provided with a first convex ring (21); the outer periphery of the first connecting portion (124) is provided with a first annular groove (122); the first convex ring (21) and the first annular groove (122) are engaged in a snap-fitting manner so that the sleeve (2) and the first moving iron core (12) are axially linked and engaged.

4. The solenoid valve core assembly according to claim 2, characterized in that: The outer diameter of the first moving iron core body (123) is greater than the outer diameter of the first connecting portion (124), and the outer diameter of the sleeve (2) is adapted to the outer diameter of the first moving iron core body (123) and is adapted to the inner diameter of the valve core sleeve (1).

5. The solenoid valve core assembly according to claim 2, characterized in that: One of the clamping block (22) and the clamping groove (142) is a second protruding ring arranged inside the sheath (2), and the other is an annular groove arranged on the outer periphery of the second moving iron core (14); The upper end of the clamping block (22) forms a first guide conical surface, and the second moving iron core (14) forms a second guide conical surface on a portion of the outer periphery of the lower end of the clamping slot (142).

6. The solenoid valve core assembly according to claim 2, characterized in that: The sheath (2) has a first small hole (23) located at a position corresponding to the position between the second moving iron core (14) and the first moving iron core (12) and a second small hole (24) located at a position corresponding to the lower end of the second moving iron core (14); the second moving iron core (14) is connected to the valve core cavity.

7. The solenoid valve core assembly according to claim 1, characterized in that: The upper end of the first moving iron core (12) is provided with a groove (121) for placing the first spring (11), and the second moving iron core (14) is provided with a countersunk hole (141) for placing the second spring (13).

8. The solenoid valve core assembly according to claim 1, characterized in that: A fixing block (15) for fixing the position of the fixed end of the first spring (11) is provided at the top end of the valve core assembly.

9. The solenoid valve core assembly according to claim 1, characterized in that: The valve core assembly also includes a sealing piston (4) arranged at a position directly opposite to the valve port, and the sealing piston (4) is linked with the second moving iron core (14).

10. A solenoid valve, characterized in that: It comprises a valve body (6), on which the solenoid valve core assembly according to any one of claims 1 to 9 is arranged.

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