Two-position three-way electromagnetic valve

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a two-position three-way electromagnetic valve which comprises a valve seat, a sleeve seat, a movable iron core assembly, a conical spring and a secondary pressing mechanism, the movable iron core assembly comprises a movable iron core, an upper sealing head and a lower sealing head, and the secondary pressing mechanism comprises a pressure triggering structure, a reverse pushing structure and a downward pressing structure; the pressure triggering structure comprises an upper pushing plate, a lower pushing plate and a triggering assembly, the upper pushing plate and the lower pushing plate are connected with the reverse pushing structure and the downward pressing structure respectively, and the triggering assembly pushes the upper pushing plate and the lower pushing plate to move through fluid pressure changes; the reverse pushing structure comprises two ejector rods, and the ejector rods are connected with the upper pushing plate; the pressing structure downwards penetrates through the movable iron core and is connected with the lower sealing head; the secondary pressing mechanism is arranged, and after the secondary pressing mechanism is triggered, secondary pressurized sealing of the lower sealing head is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electromagnetic valves, in particular to a two-position three-way electromagnetic valve. BACKGROUND

[0002] As an important fluid control element, the two-position three-way electromagnetic valve is widely used in industrial fluid pipeline control, hydraulic and pneumatic systems, automobile fluid circulation systems, intelligent bathroom and many other fields due to its compact structure and rapid response. The core function of the two-position three-way electromagnetic valve is to drive the valve core to act through electromagnetic force or mechanical force, realize the on-off switching between different channels, and then control the flow direction and flow state of the fluid. In actual application, the two-position three-way electromagnetic valve often needs to maintain a preset initial conduction and sealing state under the unpowered state. The sealing reliability in this state directly determines the accuracy of fluid control and the stability of system operation.

[0003] In the prior art, the sealing under the unpowered condition usually relies on the elastic element such as spring to apply a pre-tightening force to the sealing head, so that the sealing head is tightly abutted against the channel port to realize sealing. However, in the process of continuous fluid flow, the fluid pressure will fluctuate, and the fluid impact is easy to generate an axial thrust on the moving parts such as the moving iron core. The initial pre-tightening force provided by the spring is difficult to adapt to the dynamic change of the fluid pressure. When the fluid pressure rises, the upward impact force of the fluid on the sealing head may offset part of the spring pre-tightening force, resulting in a small gap between the sealing head and the channel port, thereby causing fluid leakage and affecting the sealing reliability. SUMMARY

[0004] In view of the above problems, a two-position three-way electromagnetic valve is provided. By setting a two-stage pressing mechanism, after the two-stage pressing mechanism is triggered, secondary pressurized sealing of the lower sealing head is realized, and the gap between the lower sealing head and the second channel caused by the fluctuation of the fluid pressure is avoided.

[0005] In order to solve the prior art problems, the application provides a two-position three-way electromagnetic valve, which comprises a valve seat provided with a first channel and a second channel, a sleeve seat provided with a third channel, a moving iron core assembly and a conical spring, the second channel and the third channel are coaxial, the moving iron core assembly comprises a moving iron core, an upper sealing head and a lower sealing head, the moving iron core is internally provided with a cavity, and the conical spring is used for pushing the lower sealing head to abut against the second channel, so that initial sealing is realized, and the two-position three-way electromagnetic valve further comprises a secondary compression mechanism arranged in the inner cavity of the moving iron core, the secondary compression mechanism comprises a pressure trigger structure, a reverse pushing structure and a downward pressing structure, the pressure trigger structure comprises an upper pushing plate, a lower pushing plate and a trigger assembly, the upper pushing plate and the lower pushing plate are connected with the reverse pushing structure and the downward pressing structure respectively, the lower end of the lower pushing plate is provided with a downward pressing rod, and the trigger assembly pushes the upper pushing plate and the lower pushing plate to move upward and downward respectively through fluid pressure change; the reverse pushing structure comprises two jacks, one end of the jack extends upward out of the moving iron core, and the jack is connected with the upper pushing plate; and the downward pressing structure is connected with the lower sealing head downward through the moving iron core.

[0006] Preferably, the trigger assembly comprises a cylinder body and a piston, the cylinder body is arranged on the side wall of the moving iron core, and the connection part of the cylinder body and the moving iron core is sealed, the piston is movably arranged in the cylinder body, one end of the piston is provided with a pushing rod which extends into the moving iron core through the cylinder body, and the end of the pushing rod is provided with two driving rods connected with the upper pushing plate and the lower pushing plate.

[0007] Preferably, the trigger assembly has two, and the two trigger assemblies are symmetrically arranged about the axis of the moving iron core.

[0008] Preferably, a first limiting ring and a first spring are arranged on the jack in a sleeved mode, the first limiting ring is fixedly connected with the jack, the two ends of the first spring are respectively abutted against the first limiting ring and the upper pushing plate, and the first spring is used for transmitting the force provided by the upper pushing plate.

[0009] Preferably, a second limiting ring is further arranged on the jack in a sleeved mode, and the second limiting ring is located below the upper pushing plate and is used for limiting the stroke of the downward movement of the upper pushing plate along the jack.

[0010] Preferably, the lower pushing plate is slidably connected with the two jacks.

[0011] Preferably, the downward pressing structure comprises a connecting assembly, the connecting assembly comprises a connecting rod and a second spring, one end of the connecting rod is connected with the lower sealing head through the lower end of the moving iron core, and the second spring is used for providing a pushing force of the connecting rod towards the inside of the moving iron core.

[0012] Preferably, the lower pressing structure further comprises a transmission assembly, and the transmission assembly comprises an elastic telescopic column arranged at the top of the connecting rod.

[0013] Preferably, the transmission assembly further comprises a counter joint arranged at the top of the elastic telescopic column, and the counter joint is provided with a counter guide hole.

[0014] Preferably, the connecting assembly further comprises a third limiting ring for limiting the descending stroke of the connecting rod.

[0015] The beneficial effects of the present application compared with the prior art are: 1. The present application sets two-stage pressing mechanism, after triggering the two-stage pressing mechanism, the top rod of the counter-acting structure abuts against the inner top of the sleeve seat to form stable support, which limits the axial displacement of the moving iron core, avoids the shaking of the moving iron core caused by fluid impact, and the lower push plate transmits secondary pressure to the lower sealing head through the lower pressing structure, which is superimposed with the initial pressure of the conical spring, thereby significantly enhancing the abutting effect of the lower sealing head and the second channel, so as to realize the secondary pressure sealing of the lower sealing head and avoid the gap between the lower sealing head and the second channel caused by fluid pressure fluctuation.

[0016] 2. The present application sets a cylinder, a piston, a push rod and two driving rods, the piston moves linearly along the inner cavity of the cylinder towards the inner cavity of the moving iron core, the piston synchronously drives the push rod to move in the same direction, and the two driving rods at the end of the push rod are displaced, one of the two driving rods pushes the upper push plate upward, and the two top rods of the counter-acting structure are extended out of the moving iron core and abut against the inner top of the sleeve seat, and the other driving rod pushes the lower push plate downward, and the pressure is transmitted to the lower pressing structure through the lower pressing rod of the lower push plate, the sealing assembly of the cylinder and the moving iron core and the linkage design of the piston, the push rod and the driving rod are realized, so that the fluid pressure itself is used as the driving force of the two-stage pressing mechanism.

[0017] 3. The present application sets two trigger assemblies, and the fluid provides the same pressure to the two trigger assemblies in the electromagnetic valve, when the fluid pressure reaches the set threshold value, the two pistons synchronously overcome the friction resistance of the inner wall of the cylinder, and move linearly along the inner cavity of the cylinder towards the inner cavity of the moving iron core, in the process of continuous fluid flow, the fluid pressure acting on the two trigger assemblies is always balanced, which ensures that the upper push plate and the lower push plate continuously receive symmetrical driving force from both sides and will not be inclined or deviated, and through the symmetrical arrangement of the two trigger assemblies, the two sides of the upper push plate and the lower push plate are uniformly stressed. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a perspective sectional view of a two-position three-way electromagnetic valve according to the present application.

[0019] Figure 2 isFigure 1 A magnified view of a portion of point A in the middle.

[0020] Figure 3 This is a planar sectional view of the moving iron core assembly and the secondary clamping mechanism in a two-position three-way solenoid valve according to this invention application.

[0021] Figure 4 This is a three-dimensional sectional view of the moving iron core assembly, pressure triggering structure, reverse push structure, and downward pressure structure in a two-position three-way solenoid valve according to this invention application.

[0022] Figure 5 This is a perspective view of the upper push plate, lower push plate, and trigger assembly in a two-position three-way solenoid valve according to this invention application.

[0023] Figure 6 This is a perspective view of the upper push plate, push rod, first limiting ring, and first spring in a two-position three-way solenoid valve according to this invention application.

[0024] Figure 7 This is a perspective view of the upper push plate, push rod, first limiting ring, first spring and second limiting ring in a two-position three-way solenoid valve according to the present invention application.

[0025] Figure 8 This is a perspective view of the push plate and push rod in a two-position three-way solenoid valve according to this invention application.

[0026] Figure 9 This is a perspective view of the lower sealing head, connecting assembly, and transmission assembly in a two-position three-way solenoid valve according to this invention application.

[0027] Figure 10 This is a perspective view of the connecting rod, the second spring, and the third limiting ring in a two-position three-way solenoid valve according to this invention application.

[0028] Figure 11 This is a perspective view of the lower pressure rod, elastic telescopic column, and connector in a two-position three-way solenoid valve according to this invention application.

[0029] The following are the labels in the diagram: 1. Valve seat; 11. First channel; 12. Second channel; 2. Sleeve seat; 21. Third channel; 3. Moving iron core assembly; 31. Moving iron core; 32. Upper sealing head; 33. Lower sealing head; 4. Conical spring; 5. Pressure triggering structure; 51. Upper push plate; 52. Lower push plate; 521. Lower pressure rod; 53. Triggering assembly; 531. Cylinder; 532. Piston; 533. Push rod; 534. Drive rod; 6. Reverse thrust structure; 61. Top rod; 62. First limit ring; 63. First spring; 64. Second limit ring; 7. Lower pressure structure; 71. Connecting assembly; 711. Connecting rod; 712. Second spring; 713. Third limit ring; 72. Transmission assembly; 721. Elastic telescopic column; 722. Butt joint; 7221. Butt guide port. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means and specific purposes and functions of the present application, the present application is described in further detail below in conjunction with the drawings and specific embodiments.

[0031] Referring to Figures 1 to 11 As shown in the figure: a two-position three-way electromagnetic valve, comprising a valve seat 1 with a first channel 11 and a second channel 12, a sleeve seat 2 with a third channel 21, a moving iron core assembly 3 and a conical spring 4, the second channel 12 and the third channel 21 are coaxial, the moving iron core assembly 3 includes a moving iron core 31, an upper sealing head 32 and a lower sealing head 33, the inside of the moving iron core 31 is provided with a cavity, the conical spring 4 is used to push the lower sealing head 33 and the second channel 12 to tightly close, realizing the initial sealing, characterized in that it further comprises a two-stage pressing mechanism arranged in the inner cavity of the moving iron core 31, the two-stage pressing mechanism includes a pressure trigger structure 5, a counter-push structure 6 and a lower pressing structure 7; the pressure trigger structure 5 includes an upper push plate 51, a lower push plate 52 and a trigger assembly 53, the upper push plate 51 and the lower push plate 52 are connected with the counter-push structure 6 and the lower pressing structure 7 respectively, the lower end of the lower push plate 52 is provided with a lower pressing rod 521, the trigger assembly 53 pushes the upper push plate 51 and the lower push plate 52 to move upward and downward respectively through the change of fluid pressure; the counter-push structure 6 includes two top rods 61, one end of the top rod 61 extends upward out of the moving iron core 31, and the top rod 61 is connected with the upper push plate 51; the lower pressing structure 7 is connected with the lower sealing head 33 by passing through the moving iron core 31 downward.

[0032] When the solenoid valve is not powered, the conical spring 4 is in a natural extension and contraction state, which exerts a downward pushing force on the moving iron core assembly 3, so that the lower sealing head 33 is tightly abutted against the second passage 12 on the valve seat 1, realizing the initial sealing of the second passage 12. At this time, the solenoid valve is in a preset initial conduction state. In the initial conduction state, the first passage 11 is in communication with the third passage 21, and the second passage 12 is closed. On the basis of the initial sealing state, the external fluid enters the solenoid valve from the first passage 11 of the valve seat 1. Since the second passage 12 is blocked by the lower sealing head 33, the fluid forms a flow channel along the gap between the moving iron core 31 and the sleeve seat 2, and finally flows to and out of the third passage 21 of the sleeve seat 2. As the fluid continues to flow in the solenoid valve, the internal cavity of the solenoid valve is filled with fluid, and the fluid pressure acts on the secondary compression mechanism in the inner cavity of the moving iron core 31. The pressure trigger structure 5 in the secondary compression mechanism is started. On the one hand, the pressure trigger structure 5 pushes the upper push plate 51 upward, and the upper push plate 51 synchronously drives the reverse push structure 6 connected thereto to act, so that the two top rods 61 extend upward out of the moving iron core 31 until the top ends of the top rods 61 abut against the inner top of the sleeve seat 2, forming a stable force support point. The abutment reaction force between the top rods 61 and the sleeve seat 2 limits the axial displacement of the moving iron core 31, avoiding the shaking of the moving iron core 31 due to fluid impact. On the other hand, the trigger assembly 53 synchronously pushes the lower push plate 52 downward, and the lower push plate 52 drives the lower end of the lower pressing rod 521 to move downward synchronously. When the lower pressing rod 521 contacts the lower pressing structure 7, the downward pressure is transmitted to the lower pressing structure 7, and the lower pressing structure 7 further transmits the pressure to the lower sealing head 33. On the basis of the initial downward pressure of the conical spring 4, the secondary downward pressure transmitted by the lower pressing structure 7 is superimposed on the lower sealing head 33, so that the abutment degree of the lower sealing head 33 and the second passage 12 is further enhanced, and at the same time, the displacement trend of the moving iron core 31 and the lower sealing head 33 is effectively restricted by the limiting support provided by the reverse push structure 6 through the top rods 61, ensuring the stable sealing fit state of the lower sealing head 33 and the second passage 12. By setting the secondary compression mechanism, the secondary pressure sealing of the lower sealing head 33 is realized, avoiding the gap between the lower sealing head 33 and the second passage 12 caused by the fluctuation of fluid pressure.

[0033] Referring to Figure 3 and Figure 5 , the trigger assembly 53 includes a cylinder body 531 and a piston 532. The cylinder body 531 is arranged on the side wall of the moving iron core 31, and the connection between the two is sealed. The piston 532 is movably arranged in the cylinder body 531. One end of the piston 532 is provided with a push rod 533 extending into the moving iron core 31 through the cylinder body 531. The end of the push rod 533 is provided with two drive rods 534 connected with the upper push plate 51 and the lower push plate 52.

[0034] With the fluid continues to flow, the fluid pressure rises and acts on the piston 532 in the cylinder 531, forming a direction of the moving iron core 31 cavity thrust, the thrust is the trigger component 53 action power source. When the fluid applied to the piston 532 thrust reaches the action threshold of the piston 532, overcome the friction resistance of the piston 532 and the inner wall of the cylinder 531, push the piston 532 along the cylinder 531 cavity to the direction of the moving iron core 31 cavity linear movement. The piston 532 synchronous belt drive and fixed connection with the push rod 533 same direction movement, the two drive rods 534 at the end of the push rod 533 displacement, one of the drive rods 534 upward push the upper push plate 51, drive the two push rods 61 of the reverse push structure 6 upwardly extending the moving iron core 31 and with the sleeve seat 2 inner top abutment; the other drive rod 534 downward push the lower push plate 52, through the lower push plate 52 lower pressure rod 521 pressure transmission to the lower pressure structure 7, ultimately acting on the lower sealing head 33 to achieve secondary compression. Trigger component 53 through the cylinder 531 and the moving iron core 31 of the sealed assembly and the piston 532 and push rod 533, drive rod 534 linkage design, thus realized with the fluid pressure as the driving force of the secondary compression mechanism.

[0035] Referring to Figure 3 and Figure 5 It is shown that the trigger component 53 has two, two trigger component 53 about the axis of symmetry of the moving iron core 31 arrangement.

[0036] In the electromagnetic valve, the fluid pressure provided by the two trigger components 53 is the same, when the fluid pressure reaches the set threshold, the two pistons 532 synchronous overcome the friction resistance of the inner wall of the cylinder 531, along the cylinder 531 cavity to the direction of the moving iron core 31 cavity linear movement. The piston 532 synchronous belt drive corresponding push rod 533 displacement, and then drive the drive rod 534 of the two trigger components 53 synchronous action: the two drive rods 534 on the upper side respectively from both sides upward push the upper push plate 51, drive the two push rods 61 of the reverse push structure 6 smoothly upwardly extending; the two drive rods 534 on the lower side respectively from both sides downward push the lower push plate 52, so that the lower push plate 52 keeps horizontal state downward movement, through the lower pressure rod 521 pressure transmission to the lower pressure structure 7, ultimately acting on the lower sealing head 33. In the process of fluid continues to flow, the fluid pressure of the two trigger components 53 is always balanced, to ensure that the upper push plate 51, the lower push plate 52 continuously driven by the two sides of the symmetric force, will not produce tilt or deviation. Through the symmetrical arrangement of the two trigger components 53, thus realized the two sides of the upper push plate 51 and the lower push plate 52 uniform stress.

[0037] Referring to Figure 4 and Figure 6As shown: the top rod 61 is sleeved with a first limiting ring 62 and a first spring 63; the first limiting ring 62 is fixedly connected with the top rod 61; the two ends of the first spring 63 are respectively abutted with the first limiting ring 62 and the upper push plate 51, and the first spring 63 is used for transmitting the acting force provided by the upper push plate 51.

[0038] When the fluid enters and fills the inner cavity of the electromagnetic valve from the first channel 11, the fluid pressure acts on the pistons 532 of the two symmetrically arranged trigger assemblies 53, drives the pistons 532, push rods 533 and drive rods 534 to act, and then pushes the upper push plate 51 to move upward. At this time, the upward acting force of the upper push plate 51 is transmitted to the first limiting ring 62 through the abutting first spring 63, and the top rod 61 is synchronously moved upward until the top end of the top rod 61 abuts against the inner top of the sleeve seat 2. In this process, the first spring 63 always maintains an elastic supporting state, realizing stable transmission of the acting force. After the top rod 61 abuts against the inner top of the sleeve seat 2, the top rod 61 is limited and cannot continue to displace upward. If the fluid pressure continues to increase, the driving force received by the trigger assembly 53 synchronously increases, and the piston 532 continues to move toward the inner cavity of the moving iron core 31, and then the upper push plate 51 is continuously moved upward through the push rod 533 and the drive rod 534. At this time, the upper push plate 51 slides upward relative to the top rod 61, and the first spring 63 between the upper push plate 51 and the first limiting ring 62 is continuously compressed, and the additional driving force brought by the increase of the fluid pressure is converted into the elastic potential energy of the first spring 63. At the same time, the continuous upward movement of the upper push plate 51 does not affect the movement of the lower push plate 52, and the trigger assembly 53 synchronously drives the lower push plate 52 to continue to move downward, so that the downward pressure transmitted to the lower sealing head 33 by the downward pressing structure 7 synchronously increases. When the fluid pressure decreases, the driving force received by the trigger assembly 53 decreases, and the piston 532 has a reverse resetting tendency. By arranging the elastic transmission structure of the first limiting ring 62 and the first spring 63 on the top rod 61, the core benefit is that after the top rod 61 abuts against the inner top of the sleeve seat 2 and is limited, the upper push plate 51 and the lower push plate 52 can still continue to move, so that the lower push plate 52 can further increase the downward pressure on the lower sealing head 33.

[0039] Referring to Figure 4 and Figure 7 As shown: the top rod 61 is also sleeved with a second limiting ring 64, and the second limiting ring 64 is located below the upper push plate 51, and is used for limiting the downward stroke of the upper push plate 51 along the top rod 61.

[0040] When the fluid pressure decreases, the driving force of the trigger assembly 53 weakens, the compressed first spring 63 releases the elastic potential energy, and a downward thrust is generated to push the upper push plate 51 downward along the top rod 61 to reset. The upper push plate 51 continues to move downward under the thrust of the first spring 63 until it abuts against the second limiting ring 64, which limits the downward stroke of the upper push plate 51, so that the upper push plate 51 returns to the initial working position, and the first spring 63 returns to the initial pre-tightening state. The setting of the second limiting ring 64 cooperates with the pre-tightening state of the first spring 63, which limits the downward stroke of the upper push plate 51, thereby ensuring that the first spring 63 is always in a pre-tightening state, providing reliable guarantee for the timely transmission of the thrust.

[0041] Referring to Figure 4 and Figure 8 , the lower push plate 52 is in sliding connection with the two top rods 61.

[0042] During the downward sliding process of the lower push plate 52, the two top rods 61 always form symmetrical guiding constraints on the lower push plate 52, ensuring that the lower push plate 52 keeps a horizontal state and moves downward smoothly. The lower end of the lower push plate 52 is in contact with the lower pressing structure 7 and transmits the pressing force to the lower pressing structure 7, and then acts on the lower sealing head 33, realizing secondary pressing. At the same time, the upper side driving rod 534 of the trigger assembly 53 drives the upper push plate 51 upward synchronously, driving the top rod 61 to stretch out upward and abut against the inner top of the sleeve seat 2. The top rod 61 not only realizes limiting support, but also continues to provide stable guidance for the downward movement of the lower push plate 52. The sliding connection design of the lower push plate 52 and the two top rods 61 realizes the use of the two top rods 61 to provide stable and reliable guiding action for the lower push plate 52.

[0043] Referring to Figure 4 , Figure 9 and Figure 10 , the lower pressing structure 7 includes a connecting assembly 71, the connecting assembly 71 includes a connecting rod 711 and a second spring 712; one end of the connecting rod 711 passes through the lower end of the moving iron core 31 and is connected with the lower sealing head 33; the second spring 712 is used to provide a thrust to the connecting rod 711 towards the inside of the moving iron core 31.

[0044] When the push-down plate 52 moves downward along the path defined by the top rod 61, the lower pressing rod 521 at the lower end of the push-down plate 52 moves downward synchronously. When the lower pressing rod 521 contacts the upper end of the connecting rod 711, as the push-down plate 52 continues to move downward, the lower pressing rod 521 exerts a downward pushing force on the connecting rod 711, which overcomes the upward pushing force of the second spring 712 and pushes the connecting rod 711 to move downward. The connecting rod 711 synchronously drives the lower sealing head 33 connected thereto to move downward. At this time, the lower sealing head 33 is subjected to the initial downward pressing force of the conical spring 4 and the additional downward pressing force transmitted by the connecting rod 711. Under the double downward pressing forces, the abutting degree of the lower sealing head 33 against the second passage 12 is further enhanced, and the deformation is increased accordingly, and the sealing performance is strengthened. When the fluid pressure decreases, the push-up plate 51 is reset under the action of the first spring 63 to drive the push-down plate 52 to move upward, and the lower pressing rod 521 moves upward synchronously and gradually separates from the connecting rod 711. After the downward pressing force of the lower pressing rod 521 disappears, the second spring 712 releases the elastic potential energy and again exerts an upward pushing force on the connecting rod 711 toward the inside of the moving iron core 31 to push the connecting rod 711 to move upward. The connecting rod 711 drives the lower sealing head 33 to move upward synchronously, and the additional downward pressing force on the lower sealing head 33 is removed, leaving only the initial pressing force of the conical spring 4, and the deformation gradually decreases and returns to the initial sealing deformation state. Through the cooperation of the connecting rod 711 and the second spring 712, the deformation of the lower sealing head 33 is controlled, and the sealing failure caused by long-term excessive deformation of the lower sealing head 33 is avoided.

[0045] Referring to Figure 4 , Figure 9 and Figure 11 , the lower pressing structure 7 further comprises a transmission assembly 72, and the transmission assembly 72 comprises an elastic telescopic column 721 arranged at the top of the connecting rod 711.

[0046] When the lower end of the pressing rod 521 contacts the top end of the elastic telescopic column 721, the downward driving force of the lower push plate 52 acts on the elastic telescopic column 721. Because the elastic telescopic column 721 has compressible characteristics, the downward movement of the pressing rod 521 does not directly drive the connecting rod 711 to move. Instead, it pushes the elastic telescopic column 721 to gradually compress, converting the downward stroke of the pressing rod 521 into the compression stroke of the elastic telescopic column 721. Simultaneously, the elastic telescopic column 721 begins to accumulate elastic potential energy due to compression. When the thrust of the elastic telescopic column 721 overcomes the upward thrust of the second spring 712 in the connecting assembly 71, it begins to drive the connecting rod 711 to move downward, thereby causing the lower sealing head 33 to displace downward and increase its deformation. During this process, most of the downward stroke of the pressure rod 521 is absorbed by the compression of the elastic telescopic column 721, and the downward stroke of the connecting rod 711 and the lower sealing head 33 is significantly reduced. The elastic telescopic column 721, through the release of elastic potential energy, transforms the dispersed stroke pressure into concentrated downward pressure, achieving the transmission effect of "small stroke, large pressure". This allows the lower sealing head 33 to obtain a sufficiently large downward pressure under the premise of a small downward stroke and deformation, effectively strengthening the sealing effect against the second channel 12.

[0047] Reference Figure 4 and Figure 11 As shown: The transmission component 72 further includes a connector 722, which is disposed on the top of the elastic telescopic column 721, and the connector 722 has a docking guide port 7221.

[0048] When fluid enters the solenoid valve cavity, the fluid pressure drives the trigger component 53 to actuate, causing the lower push plate 52 to move downwards along the path defined by the push rod 61. Simultaneously, the lower pressure rod 521 moves vertically downwards, gradually approaching the connector 722. When the lower end of the lower pressure rod 521 enters the docking guide port 7221 of the connector 722, the side wall of the guide port forms a guiding constraint on the lower pressure rod 521. If there is a slight deviation in the lower pressure rod 521 or the connecting rod 711, the guide port will fine-tune the posture of the lower pressure rod 521 through contact force, simultaneously causing the connector 722 and the elastic telescopic column 721 to undergo a small-scale adaptive position adjustment, ensuring that the lower pressure rod 521 can continuously move downwards along the central axis of the guide port. As the downward pressure rod 521 continues to move downward, its lower end abuts against the connector 722. At this point, guided by the docking guide port 7221, the central axis of the downward pressure rod 521 completely coincides with the central axes of the connector 722, the elastic telescopic column 721, and the connecting rod 711, achieving a coaxial state among the three. Subsequently, the downward pressure generated by the continuous downward movement of the push plate 52 is vertically transmitted to the connector 722 through the downward pressure rod 521, and then transmitted to the elastic telescopic column 721 through the connector 722, thereby avoiding the generation of lateral force due to eccentricity.

[0049] Reference Figure 4 andFigure 10 As shown: the connecting assembly 71 further comprises a third limit ring 713, which is used to limit the descending stroke of the connecting rod 711.

[0050] When the fluid enters the electromagnetic valve inner cavity, the fluid pressure drives the trigger assembly 53 to act, which drives the lower push plate 52 and the lower push rod 521 to move downward, and transmits the downward pressure to the connecting rod 711 through the transmission assembly 72. The connecting rod 711 overcomes the upward thrust of the second spring 712 and starts to move downward, while the third limit ring 713 fixed on it moves downward synchronously. In this process, the connecting rod 711 continuously drives the lower sealing head 33 to move downward, so that the deformation of the lower sealing head 33 gradually increases, and the sealing performance is continuously strengthened. When the lower end surface of the third limit ring 713 abuts against the bottom of the inner cavity of the moving iron core 31, the bottom of the inner cavity of the moving iron core 31 forms a rigid block to the third limit ring 713, which limits the connecting rod 711 to continue to move downward, so that the descending stroke of the connecting rod 711 is limited within a predetermined range. By limiting the descending stroke of the connecting rod 711, the excessive deformation of the lower sealing head 33 is avoided.

[0051] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A two-position three-way electromagnetic valve, comprising a valve seat (1) provided with a first passage (11) and a second passage (12), a sleeve seat (2) provided with a third passage (21), a moving iron core assembly (3) and a conical spring (4), the second passage (12) and the third passage (21) being coaxial, the moving iron core assembly (3) comprising a moving iron core (31), an upper sealing head (32) and a lower sealing head (33), the moving iron core (31) being internally provided with a cavity, the conical spring (4) being used to push the lower sealing head (33) against the second passage (12) to achieve initial sealing, characterized in that, Further comprising a secondary compression mechanism arranged in the inner cavity of the moving iron core (31), the secondary compression mechanism comprising a pressure trigger structure (5), a counter-push structure (6) and a downward pushing structure (7); The pressure trigger structure (5) comprises an upper pushing plate (51), a lower pushing plate (52) and a trigger assembly (53), the upper pushing plate (51) and the lower pushing plate (52) are connected with the counter-push structure (6) and the downward pushing structure (7) respectively, the lower end of the lower pushing plate (52) is provided with a downward pushing rod (521), the trigger assembly (53) pushes the upper pushing plate (51) and the lower pushing plate (52) to move upward and downward respectively through fluid pressure change; The counter-push structure (6) comprises two top rods (61), one end of the top rod (61) extends out of the moving iron core (31) upward, and the top rod (61) is connected with the upper pushing plate (51); The downward pushing structure (7) passes through the moving iron core (31) downward and is connected with the lower sealing head (33).

2. The two-position three-way solenoid valve according to claim 1, wherein The trigger assembly (53) comprises a cylinder (531) and a piston (532); The cylinder (531) is arranged on the side wall of the moving iron core (31); The piston (532) is movably arranged in the cylinder (531), one end of the piston (532) is provided with a pushing rod (533) extending into the moving iron core (31) through the cylinder (531), and the end of the pushing rod (533) is provided with two driving rods (534) connected with the upper pushing plate (51) and the lower pushing plate (52).

3. The two-position three-way solenoid valve according to claim 2, wherein The trigger assembly (53) has two, and the two trigger assemblies (53) are symmetrically arranged about the axis of the moving iron core (31).

4. The two-position three-way solenoid valve of claim 1, wherein The top rod (61) is sleeved with a first limiting ring (62) and a first spring (63); The first limiting ring (62) is fixedly connected with the top rod (61); The two ends of the first spring (63) abut against the first limiting ring (62) and the upper pushing plate (51) respectively, and the first spring (63) is used for transmitting the force provided by the upper pushing plate (51).

5. The two-position three-way solenoid valve according to claim 4, wherein The top rod (61) is also sleeved with a second limiting ring (64), and the second limiting ring (64) is located below the upper pushing plate (51) and is used for limiting the stroke of the downward movement of the upper pushing plate (51) along the top rod (61).

6. The two-position three-way solenoid valve of claim 1, wherein The lower pushing plate (52) is slidably connected with the two top rods (61).

7. The two-position three-way solenoid valve of claim 1, wherein The downward pushing structure (7) comprises a connecting assembly (71), and the connecting assembly (71) comprises a connecting rod (711) and a second spring (712); One end of the connecting rod (711) passes through the lower end of the moving iron core (31) and is connected with the lower sealing head (33); The second spring (712) is used for providing a pushing force towards the inside of the moving iron core (31) for the connecting rod (711).

8. The two-position three-way solenoid valve according to claim 7, wherein The downward pushing structure (7) further comprises a transmission assembly (72), and the transmission assembly (72) comprises an elastic telescopic column (721), and the elastic telescopic column (721) is arranged at the top of the connecting rod (711).

9. The two-position three-way solenoid valve according to claim 8, wherein The transmission assembly (72) further comprises a docking joint (722) provided at the top of the elastic telescopic column (721), and a docking guide opening (7221) is formed in the docking joint (722).

10. The two-position three-way solenoid valve of claim 7, wherein The connecting assembly (71) further comprises a third limiting ring (713) for limiting the descending stroke of the connecting rod (711).

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