Proportional solenoid valve with valve stem cushioning function

Abstract

The present application relates to the technical field of electromagnetic valve, in particular to a proportional electromagnetic valve with valve rod buffering function, which is characterized in that an elastic connecting assembly is arranged between the valve core and the moving iron core, and a guide channel is arranged in the valve seat, so that a pressure cavity is formed between the outer wall of the valve core and the inner wall of the valve seat, which is communicated with the air inlet cavity, the axial effective area of the fluid in the pressure cavity acting on the valve core is not less than the axial effective area of the fluid acting on the valve core at the valve port, when the valve port is in the closed state and the internal fluid pressure rises, the fluid pressure in the pressure cavity can generate a force opposite to the fluid acting direction at the valve port, thereby offsetting the thrust of the fluid at the valve port to the valve core, effectively solving the problem that the valve core is easily pushed open by the fluid pressure due to the elastic connection between the valve core and the moving iron core in the existing electromagnetic valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to a proportional electromagnetic valve with valve rod buffering function. BACKGROUND

[0002] As a key industrial component for controlling fluid on-off or direction using electromagnetic force, electromagnetic valves are widely used in hydraulic, pneumatic and other fluid control systems. By energizing the electromagnetic coil to generate magnetic force to drive the valve core movement, the flow path can be quickly switched or the flow rate can be regulated. Due to its fast response speed, high control accuracy, easy integration with automatic circuit, etc., the electromagnetic valve has become an indispensable basic actuator in modern industrial equipment.

[0003] However, in the design of existing electromagnetic valves, the valve rod is usually of an integrated structure. When the electromagnetic valve is closed, the valve rod quickly returns under the action of the spring force, and the top of the valve rod will collide with the sealing opening of the valve core. This impact can cause the sealing surface at the top of the valve rod to gradually wear and even deform over a long period of repeated work, thereby reducing the sealing performance and causing fluid leakage. Once leakage occurs, the entire valve rod or the entire electromagnetic valve often needs to be replaced, which not only increases maintenance costs but also causes resource waste.

[0004] To solve the above-mentioned wear and impact problems, some existing technologies attempt to introduce an elastic connection structure between the valve core and the moving iron core, so that the valve core can have certain axial displacement relative to the moving iron core, thereby achieving a buffering effect. However, this method has obvious defects: when the fluid pressure at the valve port is too high, exceeding the elastic force of the moving iron core on the valve core, the fluid pressure can push the valve core away from the valve port, causing sealing failure and abnormal leakage, which seriously affects the reliability and service life of the electromagnetic valve. SUMMARY

[0005] In view of the problems existing in the prior art, a proportional electromagnetic valve with valve rod buffering function is provided, which sets an elastic connection assembly between the valve core and the moving iron core, and sets a guide passage inside the valve seat, so that a pressure chamber is formed between the outer wall of the valve core and the inner wall of the valve seat, which is in communication with the air inlet chamber. The axial effective area of the fluid acting on the valve core in the pressure chamber is not less than the axial effective area of the fluid acting on the valve core at the valve port. When the valve port is in a closed state and the internal fluid pressure rises, the fluid pressure in the pressure chamber can generate a force opposite to the direction of the fluid acting on the valve port, thereby offsetting the thrust of the fluid on the valve core, effectively solving the problem that the valve core is easily pushed open by the fluid pressure due to the elastic connection between the valve core and the moving iron core in the existing electromagnetic valve.

[0006] To solve the prior art problems, the present application provides a proportional electromagnetic valve with valve rod buffering function, comprising a valve shell and a valve seat, the valve shell is provided with an electromagnet and a moving iron core, the valve seat is provided with an air outlet and an air inlet, the inner cavity of the valve seat is divided into an air inlet cavity communicated with the air inlet and an air outlet cavity communicated with the air outlet, a valve port is arranged between the air inlet cavity and the air outlet cavity, and a valve core capable of moving to block the valve port is further arranged in the air outlet cavity; an elastic connection assembly is arranged between the moving iron core and the valve core; a pressure cavity is formed between the outer wall of the valve core and the inner wall of the valve seat, a communication channel is arranged in the valve seat to communicate the pressure cavity and the air inlet cavity, and the axial effective area of the valve core in the pressure cavity is not less than the axial effective area of the valve core acted by fluid at the valve port; when the valve core blocks the valve port and the fluid pressure at the valve port rises, the fluid pressure in the pressure cavity can offset the force of the fluid acting on the valve core at the valve port, so as to prevent the valve core from being opened due to the fluid pressure being greater than the elastic force of the elastic connection assembly.

[0007] Preferably, a fixed sleeve is arranged in the valve seat, one end of the fixed sleeve is provided with a fixed ring, the inner opening of the fixed ring forms the valve port, the fixed sleeve is provided with air outlet holes distributed in the circumferential direction thereof, and the outer wall of the fixed sleeve is provided with an annular groove coaxial with the fixed sleeve and communicated with the air outlet.

[0008] Preferably, a first buffering cavity is formed between one end of the fixed sleeve and the inner wall of the valve seat, the outer wall of the fixed sleeve is further provided with a second buffering cavity, the communication channel is arranged in the fixed sleeve and extends in the axial direction thereof, the two ends of the communication channel are respectively communicated with the first buffering cavity and the second buffering cavity, the first buffering cavity is provided with first communication holes distributed in the circumferential direction thereof and communicated with the air inlet cavity, and the second buffering cavity is provided with second communication holes distributed in the circumferential direction thereof and communicated with the pressure cavity.

[0009] Preferably, one end of the valve core deviated from the valve port is provided with a stepped ring groove, one end of the fixed sleeve deviated from the valve port is provided with a limiting ring, the limiting ring is in sealing sliding fit with the stepped ring groove, and the pressure cavity is formed between the limiting ring and the stepped ring groove.

[0010] Preferably, the moving iron core is provided with a mounting groove extending in the radial direction thereof, the elastic connection assembly comprises two clamping blocks slidingly arranged in the mounting groove in opposite directions, the opposite ends of the two clamping blocks are respectively provided with inclined grooves; a connecting rod is coaxially and slidingly arranged in the moving iron core, one end of the connecting rod abuts on the inclined grooves of the two clamping blocks, the other end of the connecting rod is connected with the valve core; and a first elastic element is arranged at the back end of the two clamping blocks, for elastically clamping the connecting rod.

[0011] Preferably, a limiting sleeve is arranged on the moving iron core, and the first elastic element is located between the clamping blocks and the inner wall of the limiting sleeve.

[0012] Preferably, the moving iron core is provided with a mounting cavity coaxial with the moving iron core, one end of the mounting cavity extending into the mounting groove, the elastic connecting assembly further comprising an abutting seat coaxially and slidingly arranged in the mounting cavity, and a second elastic element arranged in the mounting groove and located between the abutting seat and the groove bottom of the mounting groove.

[0013] Preferably, the connecting rod is coaxially and threadedly connected with the valve core.

[0014] Preferably, one end of the connecting rod is provided with two rollers rolling with the inclined surface of the clamping block.

[0015] Preferably, the outer side of the valve core is provided with a sealing ring sealingly and slidingly fitted with the inner wall of the fixing sleeve.

[0016] The application has the following beneficial effects compared with the prior art:

[0017] The application elastically connects the valve core with the moving iron core, and provides a through channel in the valve seat, so that a pressure cavity is formed between the outer wall of the valve core and the inner wall of the valve seat and communicates with the air inlet cavity through the through channel, and the axial effective area of the fluid in the pressure cavity acting on the valve core is not less than the axial effective area of the fluid at the valve port acting on the valve core, so that when the valve core is blocked at the valve port and the fluid pressure at the valve port is increased, the fluid pressure in the pressure cavity can offset the force of the fluid at the valve port acting on the valve core, preventing the valve core from being opened due to the fluid pressure being greater than the elastic force of the elastic connecting assembly, and solving the problem that the valve core is easily opened by the fluid when the valve core is elastically connected with the moving iron core.

[0018] Meanwhile, the two clamping blocks and the first elastic clamping element provided in the moving iron core elastically clamp the connecting rod connected with the valve core. The end of the connecting rod slidingly fits with the inclined groove of the clamping block, generating a first heavy buffering effect during movement; when the end of the connecting rod contacts the abutting seat, the second elastic element is compressed, providing a second heavy buffering. The double buffering structure effectively reduces the impact between the moving iron core and the valve core, improving the stability and service life of the system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of a proportional electromagnetic valve with valve rod buffering function according to the application.

[0020] Figure 2 is a perspective view of a proportional electromagnetic valve with valve rod buffering function according to the application.

[0021] Figure 3 is a sectional view of a proportional electromagnetic valve with valve rod buffering function according to the application.

[0022] Figure 4 is Figure 3is a local enlarged view of A in the figure.

[0023] Figure 5 is a schematic view of the valve port conduction in a proportional electromagnetic valve with valve rod buffering function of the application.

[0024] Figure 6 is a perspective view of the moving iron core and the fixed sleeve in a proportional electromagnetic valve with valve rod buffering function of the application.

[0025] Figure 7 is a perspective exploded view of the elastic connecting assembly in a proportional electromagnetic valve with valve rod buffering function of the application.

[0026] Figure 8 is Figure 7 is a local enlarged view of B in the figure.

[0027] Figure 9 is a perspective view of the fixed ring, connecting rod and roller in a proportional electromagnetic valve with valve rod buffering function of the application.

[0028] Figure 10 is a perspective exploded view of the fixed ring, connecting rod and roller in a proportional electromagnetic valve with valve rod buffering function of the application.

[0029] In the figure, the reference signs are as follows: 1, valve housing; 2, valve seat; 21, air inlet; 22, air outlet; 23, air inlet cavity; 24, air outlet cavity; 3, electromagnet; 4, moving iron core; 41, mounting groove; 42, limiting sleeve; 43, mounting cavity; 5, valve core; 51, pressure cavity; 52, stepped ring groove; 53, sealing ring; 6, elastic connecting assembly; 61, clamping block; 611, inclined groove; 62, connecting rod; 63, first elastic element; 64, abutting seat; 65, second elastic element; 66, roller; 7, fixed sleeve; 71, conduction passage; 72, fixed ring; 721, valve port; 73, air outlet hole; 74, annular groove; 75, first buffering cavity; 751, first communication hole; 76, second buffering cavity; 761, second communication hole; 77, limiting ring. DETAILED DESCRIPTION

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

[0031] As Figures 1-5As shown, a proportional electromagnetic valve with valve rod buffering function includes a valve housing 1 and a valve seat 2. The valve housing 1 is provided with an electromagnet 3 and a moving iron core 4. The valve seat 2 is provided with a gas outlet 22 and a gas inlet 21. The inner cavity of the valve seat 2 is divided into a gas inlet cavity 23 communicating with the gas inlet 21 and a gas outlet cavity 24 communicating with the gas outlet 22. A valve port 721 is arranged between the gas inlet cavity 23 and the gas outlet cavity 24. A valve core 5 capable of moving to block the valve port 721 is further arranged in the gas outlet cavity 24. An elastic connection assembly 6 is arranged between the moving iron core 4 and the valve core 5. A pressure cavity 51 is formed between the outer wall of the valve core 5 and the inner wall of the valve seat 2. A communication passage 71 is arranged in the valve seat 2 to communicate the pressure cavity 51 with the gas inlet cavity 23. The axial effective area of the fluid acting on the valve core 5 in the pressure cavity 51 is not less than the axial effective area of the fluid acting on the valve core 5 at the valve port 721. When the valve core 5 blocks the valve port 721 and the fluid pressure at the valve port 721 rises, the fluid pressure in the pressure cavity 51 can offset the force of the fluid acting on the valve core 5 at the valve port 721, preventing the valve core 5 from being pushed open due to the fluid pressure being greater than the elastic force of the elastic connection assembly 6.

[0032] A reset spring is further arranged between the electromagnet 3 and the moving iron core 4.

[0033] The proportional electromagnetic valve includes a valve housing 1 and a valve seat 2. The valve housing 1 is internally provided with an electromagnet 3 and a moving iron core 4. The valve seat 2 is provided with a gas inlet 21 and a gas outlet 22. The inner cavity of the valve seat 2 is divided into a gas inlet cavity 23 communicating with the gas inlet 21 and a gas outlet cavity 24 communicating with the gas outlet 22. A valve port 721 is arranged between the gas inlet cavity 23 and the gas outlet cavity 24. A valve core 5 is arranged in the gas outlet cavity 24, which can move axially to seal or open the valve port 721.

[0034] The moving iron core 4 and the valve core 5 are connected through an elastic connection assembly 6. The elastic connection assembly 6 includes a spring and a connecting piece, which is used to transmit the axial movement of the moving iron core 4 to the valve core 5 and provide elastic pre-tightening force.

[0035] An annular pressure cavity 51 is formed between the outer wall of the valve core 5 and the inner wall of the valve seat 2. The valve seat 2 is internally provided with a communication passage 71, which communicates the pressure cavity 51 with the gas inlet cavity 23. The effective area of the pressure cavity 51 on the axial projection plane of the valve core 5 is not less than the effective area of the valve port 721 on the axial projection plane of the valve core 5.

[0036] When the electromagnet 3 is powered off, the moving iron core 4 is axially displaced under the elastic action of the return spring, pushing the valve core 5 toward the valve port 721 through the elastic connecting assembly 6, and the elastic connecting assembly 6 can buffer the force of the valve core 5 on the valve port 721 until the valve core 5 contacts and seals the valve port 721. At this time, the fluid pressure in the inlet chamber 23 enters the pressure chamber 51 through the communication passage 71, acting on the side of the valve core 5 away from the valve port 721.

[0037] When the fluid pressure at the valve port 721 rises, the fluid at the valve port 721 generates an axial force on the valve core 5 toward the direction away from the valve port 721. At the same time, the fluid in the pressure chamber 51 generates an axial force on the valve core 5 toward the valve port 721. Since the effective area of the pressure chamber 51 is not less than the effective area at the valve port 721, the force of the fluid pressure in the pressure chamber 51 on the valve core 5 can offset or exceed the force of the fluid at the valve port 721 on the valve core 5, thereby preventing the valve core 5 from being opened due to the fluid pressure being greater than the elastic force of the elastic connecting assembly 6.

[0038] When the electromagnet 3 is powered on, the moving iron core 4 drives the valve core 5 away from the valve port 721 through the elastic connecting assembly 6, and the fluid flows from the inlet chamber 23 to the outlet chamber 24 through the valve port 721, realizing the opening of the valve.

[0039] By setting the pressure chamber 51 and the communication passage 71 communicating with the inlet chamber 23, and reasonably matching the effective acting areas of the pressure chamber 51 and the valve port 721, the fluid pressures on both sides of the valve core 5 are balanced or nearly balanced in the sealed state of the valve port 721, effectively preventing the valve core 5 from being unexpectedly opened due to fluctuations or rises in the inlet pressure, improving the sealing reliability and control accuracy of the valve. At the same time, this structure avoids the problem that the elastic connecting assembly 6 needs to provide excessive pre-tightening force under high pressure conditions, which is beneficial to prolong the service life of the element and reduce the manufacturing cost.

[0040] As shown in Figure 4 and Figure 5 , a fixed sleeve 7 is arranged in the valve seat 2, one end of the fixed sleeve 7 is provided with a fixed ring 72, the inner hole of the fixed ring 72 forms the valve port 721, the fixed sleeve 7 is provided with a plurality of outlet holes 73 distributed circumferentially, and the outer wall of the fixed sleeve 7 is provided with an annular groove 74 coaxial with it and communicating with the outlet port 22.

[0041] The fixed sleeve 7 is fixedly installed inside the valve seat 2. One end of the fixed sleeve 7 is provided with a fixed ring 72, and the inner hole of the fixed ring 72 constitutes the valve port 721. A plurality of outlet holes 73 are arranged on the wall of the fixed sleeve 7, which are uniformly distributed circumferentially. The outer wall of the fixed sleeve 7 is provided with an annular groove 74 coaxial with it, and the annular groove 74 is in communication with the outlet port 22 on the valve seat 2.

[0042] The fixed sleeve 7 is coaxially installed in the inner cavity of the valve seat 2, and an annular gap is formed between the outer wall of the fixed sleeve 7 and the inner wall of the valve seat 2. The annular gap and the annular groove 74 on the fixed sleeve 7 jointly constitute a part of the gas outlet cavity 24. The valve core 5 can axially move in the fixed sleeve 7, and an annular pressure cavity 51 is formed between the outer wall of the valve core 5 and the inner wall of the fixed sleeve 7.

[0043] When the valve core 5 is driven by the moving iron core 4 to move away from the valve port 721, the fluid flows from the gas inlet cavity 23, enters the inside of the fixed sleeve 7 after passing through the valve port 721, and then flows into the annular groove 74 on the outer wall of the fixed sleeve 7 through the circumferentially distributed gas outlet holes 73, and finally flows out through the gas outlet port 22, completing the delivery of the fluid medium.

[0044] When the valve core 5 seals the valve port 721, the high-pressure fluid in the gas inlet cavity 23 continuously enters the pressure cavity 51 through the through channel 71 in the valve seat 2, and acts on the back pressure surface of the valve core 5.

[0045] By adopting the fixed sleeve 7 structure with a fixed ring 72 and circumferential gas outlet holes 73, and cooperating with the inner wall of the valve seat 2 to form a gas flow passage, it is ensured that the fluid can uniformly and stably flow out in the open state, the flow characteristics are improved, and the vortex and pressure fluctuation are reduced. The coaxial annular groove 74 structure ensures smooth docking of the gas outlet port 22 and the flow passage, and reduces the flow resistance loss. This structure has high integration, is convenient for assembly and maintenance of coaxiality, and improves the working stability and reliability of the valve.

[0046] As shown in Figure 4 and Figure 5 , a first buffer cavity 75 is formed between one end of the fixed sleeve 7 and the inner wall of the valve seat 2, and a second buffer cavity 76 is further arranged on the outer wall of the fixed sleeve 7. The through channel 71 is arranged in the fixed sleeve 7 and extends axially, and the two ends of the through channel 71 are respectively communicated with the first buffer cavity 75 and the second buffer cavity 76. The first buffer cavity 75 is provided with first communication holes 751 which are circumferentially distributed and communicated with the gas inlet cavity 23, and the second buffer cavity 76 is provided with second communication holes 761 which are circumferentially distributed and communicated with the pressure cavity 51.

[0047] The high-pressure fluid from the gas inlet cavity 23 enters the first buffer cavity 75 through the first communication holes 751 circumferentially distributed on the first buffer cavity 75. Then, the fluid flows into the second buffer cavity 76 through the axial through channel 71 in the inside of the fixed sleeve 7. Finally, the fluid enters the pressure cavity 51 through the second communication holes 761 circumferentially distributed on the second buffer cavity 76, and acts on the back pressure surface of the valve core 5.

[0048] The multi-stage buffer chamber and the axially extending through channel 71 jointly constitute a pressure transmission path between the gas inlet cavity 23 and the pressure cavity 51.

[0049] The first buffer cavity 75 and the second buffer cavity 76 are connected by the axial through channel 71 to form a fluid passage with multi-stage buffering. The circumferentially distributed first communication holes 751 and the second communication holes 761 enable the fluid to enter and flow out of the buffer cavities uniformly and smoothly, effectively attenuating the pressure pulsation and flow fluctuation from the air inlet cavity 23 and avoiding the direct action of pressure impact on the valve core 5. The axial arrangement of the through channel 71 simplifies the internal flow channel structure, facilitating processing and ensuring coaxiality.

[0050] As shown in Figure 4 and Figure 5 , the valve core 5 is provided with a stepped ring groove 52 offset from one end of the valve port 721, and the fixed sleeve 7 is provided with a limiting ring 77 offset from one end of the valve port 721, the limiting ring 77 and the stepped ring groove 52 are in sealing sliding fit, and the limiting ring 77 and the stepped ring groove 52 form the pressure cavity 51.

[0051] When the valve core 5 moves axially in the fixed sleeve 7, the limiting ring 77 always slides in the stepped ring groove 52 and maintains sealing fit, ensuring the airtightness of the pressure cavity 51. The fluid from the second buffer cavity 76 enters the airtight pressure cavity 51 formed by the limiting ring 77 and the stepped ring groove 52 through the second communication hole 761, acting on the stepped ring groove 52 end face (i.e. back pressure face) of the valve core 5.

[0052] The sealing sliding fit of the limiting ring 77 and the stepped ring groove 52 directly forms the pressure cavity 51, eliminating the need for independent sealing members, simplifying the structure, reducing the number of parts and potential leakage points. The sliding fit structure ensures the stability of the volume change of the pressure cavity 51 during the movement of the valve core 5, which is conducive to the stable establishment of pressure.

[0053] As shown in Figure 4 and Figure 5 , the moving iron core 4 is provided with a mounting groove 41 extending in its radial direction, and the elastic connection assembly 6 includes two clamping blocks 61 slidably arranged in the mounting groove 41, the opposite ends of the two clamping blocks 61 are provided with inclined grooves 611; a connecting rod 62 is coaxially and slidably arranged in the moving iron core 4, one end of the connecting rod 62 abuts against the inclined grooves 611 of the two clamping blocks 61, and the other end of the connecting rod 62 is connected with the valve core 5; a first elastic element 63 is arranged at the back end of the two clamping blocks 61 for elastically clamping the connecting rod 62.

[0054] When the moving iron core 4 moves axially under the action of electromagnetic force, it drives the connecting rod 62 and the valve core 5 to move synchronously through the cooperation of the two clamping blocks 61 and the end inclined grooves 611 of the connecting rod 62, realizing the opening and closing of the valve port 721. During this process, the first elastic element 63 ensures reliable contact and force transmission between the clamping blocks 61 and the connecting rod 62.

[0055] When the valve core 5 encounters excessive resistance or is stuck, the axial force acting on the connecting rod 62 increases. This force is transmitted to the inclined groove 611 contact surface, generating a radial component that causes the two clamping blocks 61 to slide away from each other against the pre-tightening force of the first elastic element 63. The radial movement of the clamping blocks 61 allows limited axial sliding of the connecting rod 62 relative to the moving iron core 4, thereby serving as an overload protection to prevent damage to the mechanism.

[0056] As shown in Figure 4 and Figure 5 , a limiting sleeve 42 is provided on the moving iron core 4, and the first elastic element 63 is located between the clamping blocks 61 and the inner wall of the limiting sleeve 42.

[0057] In normal working condition, the first elastic element 63 is compressed between the clamping blocks 61 and the inner wall of the limiting sleeve 42, and its elastic force forces the two clamping blocks 61 to move towards each other, thereby tightly clamping the connecting rod 62 through the inclined groove 611, ensuring that the driving force of the moving iron core 4 is effectively transmitted to the valve core 5.

[0058] When an overload occurs, the abnormal axial force on the connecting rod 62 is decomposed through the inclined groove 611 interface, generating a radial force that causes the clamping blocks 61 to move away from each other. The clamping blocks 61 move towards the limiting sleeve 42 against the pre-tightening force of the first elastic element 63, achieving absorption and buffering of the overload energy. The limiting sleeve 42 provides guidance and final limiting for the radial movement of the clamping blocks 61, preventing them from coming out.

[0059] The provision of the limiting sleeve 42 provides a stable and reliable installation base and force application point for the first elastic element 63, ensuring that the pre-tightening force is applied in the correct and constant direction. It also restricts the movement of the clamping blocks 61 and the elastic element, preventing excessive displacement or disengagement under overload conditions, thereby improving the reliability, stability and service life of the entire overload protection mechanism.

[0060] As shown in Figure 4 and Figure 5 , a mounting cavity 43 coaxial with the moving iron core 4 is provided in the moving iron core 4, and one end of the mounting cavity 43 extends into the mounting groove 41. The elastic connection assembly 6 further comprises an abutting seat 64 coaxially and slidingly arranged in the mounting cavity 43, and a second elastic element 65 arranged in the mounting groove 41 between the abutting seat 64 and the groove bottom of the mounting groove 41.

[0061] During normal transmission of driving force, the clamping blocks 61 clamp the connecting rod 62 under the action of the first elastic element 63, and the abutting seat 64 remains in position under the support of the second elastic element 65, and the entire transmission chain is rigidly connected.

[0062] When overload occurs, abnormal axial force of connecting rod 62 forces clamping blocks 61 to slide away from each other, clamping blocks 61 first compress first elastic element 63. When displacement of clamping blocks 61 reaches a certain amount, clamping blocks 61 begin to contact and compress abutting seat 64, thereby further compressing second elastic element 65. Second elastic element 65 provides additional elastic resistance of greater stiffness, achieving secondary buffering and absorbing of excessive impact energy.

[0063] By setting the two-stage buffering mechanism with abutting seat 64 and second elastic element 65, progressive overload protection is formed. The first stage buffering (first elastic element 63) deals with slight disturbances and sticking; the second stage buffering (second elastic element 65) intervenes when the impact is greater, providing greater damping force, effectively preventing damage to the mechanism caused by extreme overload. The two-stage buffering works together to expand the force and travel range of the overload protection, significantly improving the reliability and impact resistance of the entire transmission system.

[0064] As shown in Figure 4 and Figure 5 , connecting rod 62 is coaxially and threadedly connected with spool 5.

[0065] During assembly or maintenance, by rotating connecting rod 62 or spool 5, the threaded engagement depth is changed, thereby accurately adjusting the initial axial position of spool 5 relative to moving iron core 4. This adjustment ensures that when moving iron core 4 is in the initial (e.g. power-off reset) position, spool 5 can be in the desired initial working position, for example maintaining a specific pre-tightening sealing force or leaving a specific gap with valve port 721. After adjustment is completed, the threaded connection part can be fixed by locking nuts, thread glue or other anti-loosening methods to prevent loosening due to vibration during work.

[0066] As shown in Figures 6-10 , one end of connecting rod 62 is provided with two rollers 66, which rollingly engage with the inclined surface of clamping blocks 61.

[0067] When moving iron core 4 drives connecting rod 62 and spool 5 to move, the two clamping blocks 61 exert axial driving force on the end of connecting rod 62 at inclined groove 611. The force is transmitted through the rolling contact of rollers 66 with the inclined surface of inclined groove 611.

[0068] When overload occurs, a relative sliding tendency occurs between connecting rod 62 and clamping blocks 61. At this time, rollers 66 roll along the inclined surface of inclined groove 611 of clamping blocks 61, converting traditional sliding friction into rolling friction.

[0069] By using the rolling engagement of rollers 66 with inclined groove 611, the frictional resistance between connecting rod 62 and clamping blocks 61 during triggering of the overload protection mechanism is significantly reduced. This reduces the phenomenon of action lag, improves the sensitivity of overload response, and makes the protection action more rapid and accurate.

[0070] As Figure 4 and Figure 5 As shown, the outer side of the valve core 5 is provided with a sealing ring 53 in sealing sliding fit with the inner wall of the fixed sleeve 7.

[0071] When the valve core 5 moves axially in the fixed sleeve 7 to perform the action of opening or closing the valve port 721, the sealing ring 53 thereon is always in close contact and relative sliding with the smooth inner wall of the fixed sleeve 7. This sliding sealing interface effectively isolates the pressure cavity 51 between the valve core 5 and the inner wall of the fixed sleeve 7 from the environment on the other side of the valve core 5.

[0072] By providing the sliding sealing ring 53, it is ensured that the fluid medium in the pressure cavity 51 is reliably sealed in the cavity in the moving and stationary state of the valve core 5, effectively preventing the medium from leaking or overflowing through the pressure cavity 51 to the rear of the valve core 5 or other undesired areas.

[0073] The above embodiments only express one or several embodiments of the present application, which are described in detail, but cannot be understood as a limitation on the protection scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all 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 proportional solenoid valve with a valve stem buffer function, comprising a valve body and a valve seat, wherein an electromagnet and a moving iron core are disposed in the valve body, and an air outlet and an air inlet are disposed on the valve seat, wherein the inner cavity of the valve seat is divided into an air inlet chamber communicating with the air inlet and an air outlet chamber communicating with the air outlet, wherein a valve port is disposed between the air inlet chamber and the air outlet chamber, and a valve core capable of moving to block the valve port is also disposed in the air outlet chamber; Its features are, An elastic connection component is provided between the moving iron core and the valve core; A pressure chamber is formed between the outer wall of the valve core and the inner wall of the valve seat. The valve seat is provided with a connecting channel that connects the pressure chamber and the air inlet chamber. The axial effective area of ​​the fluid acting on the valve core in the pressure chamber is not less than the axial effective area of ​​the fluid acting on the valve core at the valve port. When the valve core is blocked at the valve port and the fluid pressure at the valve port increases, the fluid pressure in the pressure chamber can counteract the force exerted by the fluid at the valve port on the valve core, preventing the valve core from being pushed open due to the fluid pressure being greater than the elastic force of the elastic connection component. The moving iron core is provided with a mounting groove extending radially therefrom, and the elastic connection assembly includes, Two clamping blocks are slidably disposed in the mounting groove, and inclined grooves are provided at the opposite ends of the two clamping blocks; The connecting rod is coaxially and slidably disposed in the moving iron core. One end of the connecting rod abuts against the inclined groove of the two clamping blocks, and the other end of the connecting rod is connected to the valve core. The first elastic element is located at the opposite ends of the two clamping blocks and is used to elastically clamp the connecting rod between the two clamping blocks.

2. A proportional solenoid valve with stem buffering function according to claim 1, characterized in that, A fixed sleeve is provided in the valve seat, and a fixed ring is provided at one end of the fixed sleeve. The inner opening of the fixed ring forms the valve port. The fixed sleeve is provided with air outlet holes distributed around its circumference. The outer wall of the fixed sleeve is provided with an annular groove that is coaxial with it and communicates with the air outlet.

3. A proportional solenoid valve with stem buffering function according to claim 2, characterized in that, A first buffer cavity is formed between one end of the fixed sleeve and the inner wall of the valve seat. A second buffer cavity is also provided on the outer wall of the fixed sleeve. The guiding channel is provided in the fixed sleeve and extends along its axial direction. The two ends of the guiding channel are respectively connected to the first buffer cavity and the second buffer cavity. A first connecting hole is provided in the first buffer cavity, which is distributed circumferentially and communicates with the air intake cavity. A second connecting hole is provided in the second buffer cavity, which is distributed circumferentially and communicates with the pressure cavity.

4. A proportional solenoid valve with stem buffering function according to claim 3, characterized in that, The valve core has a stepped annular groove at one end off the valve port, and the fixed sleeve has a limit ring at one end off the valve port. The limit ring and the stepped annular groove are in a sealing sliding fit, and the pressure chamber is formed between the limit ring and the stepped annular groove.

5. A proportional solenoid valve with stem buffering function according to claim 1, characterized in that, A limiting sleeve is provided on the moving iron core, and the first elastic element is located between the clamping block and the inner wall of the limiting sleeve.

6. A proportional solenoid valve with stem buffering function according to claim 1, characterized in that, The moving iron core has a mounting cavity coaxial with it, one end of which extends into the mounting groove. The elastic connection assembly also includes... The abutment seat is coaxially and slidably disposed in the mounting cavity. The second elastic element is disposed in the mounting groove and located between the abutment seat and the bottom of the mounting groove.

7. A proportional solenoid valve with stem buffering function according to claim 1, characterized in that, The connecting rod is coaxially threaded with the valve core.

8. A proportional solenoid valve with stem buffering function according to claim 1, characterized in that, Two rollers are provided at one end of the connecting rod, and the rollers roll in contact with the inclined surface of the clamping block.

9. A proportional solenoid valve with stem buffering function according to any one of claims 1-4, characterized in that, The outer side of the valve core is provided with a sealing ring that slides and seals against the inner wall of the fixed sleeve.

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