Balanced type two-position three-way air pressure electromagnetic valve

Abstract

The balanced type two-position three-way air pressure electromagnetic valve can give consideration to miniaturization, quick response and high sealing reliability and mainly comprises a valve rod and a valve body which are matched with each other, the two ends of the valve rod are connected with an electromagnet and a main spring in an abutting mode respectively, and the valve rod sequentially comprises a lower cylindrical section, a lower sealing conical surface, an upper sealing conical surface, a transition section and an upper cylindrical section. The R port, the C port and the P port are located between the transition section and the upper sealing conical surface, between the upper sealing conical surface and the lower sealing conical surface and between the lower sealing conical surface and the lower cylindrical section respectively, an upper sealing structure for preventing a medium from entering the electromagnet is arranged at the upper end of the valve rod, and an upper sealing gasket matched with the upper sealing conical surface is arranged in an inner cavity between the C port and the R port. A lower sealing gasket matched with the lower sealing conical surface is arranged in an inner cavity between the opening C and the opening P. A lower sealing structure for preventing a medium from being emptied is arranged at the lower end of the valve rod, and the areas, borne by the upper sealing conical surface, the lower sealing conical surface and the lower cylindrical section in the axial direction, of the medium pressure are equal.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electromagnetic valves, and particularly relates to a balanced two-position three-way pneumatic electromagnetic valve. BACKGROUND

[0002] In the fields of high-pressure pneumatic control systems, industrial automation equipment, etc., the two-position three-way pneumatic electromagnetic valve is a core element for realizing medium on-off and reversing control, and the volume, response performance and sealing reliability of the valve directly affect the integration, control accuracy and operation stability of the entire system.

[0003] 1. Technical defects of existing electromagnetic valve structure The two-position three-way pneumatic electromagnetic valves currently applied in high-pressure scenarios are mainly divided into direct-acting type and pilot type. The traditional direct-acting high-pressure electromagnetic valve adopts a non-balanced structure, and the medium forces at both ends of the valve rod cannot be counteracted. In order to overcome the force of high-pressure medium on the valve, the volume of the electromagnet needs to be increased to increase the magnetic attraction force, resulting in a large overall volume and weight of the electromagnetic valve, which is difficult to meet the development needs of lightweight and miniaturization of equipment.

[0004] Although the pilot high-pressure electromagnetic valve reduces the requirement for electromagnetic attraction force through a pilot mechanism and reduces the volume, it has a secondary reversing process, resulting in a relatively long response time for opening and closing of the valve, limiting the control sensitivity of the system and being unable to adapt to application scenarios with high requirements for response speed.

[0005] 2. Insufficient reliability of existing sealing structure The sealing structure of the existing high-pressure electromagnetic valve mainly adopts a hard sealing form of metal cone surface-metal sealing surface. This structure has two major problems: first, the fitting precision of the sealing surface is extremely high, and in actual application, the leakage is large, which is difficult to meet the low leakage demand in high-pressure scenarios; second, the metal sealing surface is reciprocatingly collided and rubbed for a long time, which is easy to produce metal debris and other impurities. These impurities can aggravate the wear of the sealing surface, leading to gradual degradation of the sealing performance, and in severe cases, causing sealing failure, affecting the reliability and safety of system operation.

[0006] In summary, the existing two-position three-way pneumatic electromagnetic valve still has room for improvement in terms of structural design and sealing performance, and there is an urgent need for a technical solution that can balance miniaturization, fast response and high sealing reliability to solve the deficiencies of the existing technology. SUMMARY

[0007] In view of the deficiencies in the above background art, the present application proposes a balanced two-position three-way pneumatic electromagnetic valve, and the technical problem to be solved is how to make the pneumatic electromagnetic valve balance miniaturization, fast response and high sealing reliability.

[0008] The technical solution of the present application is: The application discloses a balanced two-position three-way pneumatic electromagnetic valve, which comprises a valve body and a valve rod which are matched with each other, the two ends of the valve rod are respectively in abutment with an electromagnet and a main spring, the valve body is provided with P, C and R ports which are communicated with an inner cavity, the valve rod comprises a lower cylindrical section, a lower sealing conical surface, an upper sealing conical surface, a transition section and an upper cylindrical section in sequence, the R port, the C port and the P port are respectively located at positions between the transition section and the upper sealing conical surface, between the upper sealing conical surface and the lower sealing conical surface and between the lower sealing conical surface and the lower cylindrical section, the upper end of the valve rod is provided with an upper sealing structure for preventing medium from entering the electromagnet, the inner cavity between the C port and the R port is provided with an upper sealing gasket matched with the upper sealing conical surface, the inner cavity between the C port and the P port is provided with a lower sealing gasket matched with the lower sealing conical surface, the lower end of the valve rod is provided with a lower sealing structure for preventing medium from being exhausted, and the upper sealing conical surface, the lower sealing conical surface and the lower cylindrical section have equal areas for bearing medium pressure in the axial direction.

[0009] Based on the above-mentioned embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the electromagnet comprises a coil skeleton base body, a coil winding, a reset spring, a moving iron core and a top rod which are arranged in an outer cover and a top cover, the electromagnet is in abutment with the upper end of the valve rod through the top rod, the top rod is a rod-shaped structure with a flat surface which is milled on the outer circle for ventilation, and the moving iron core is axially symmetrically provided with an air passage for communicating a reset spring mounting area with the upper end of the valve rod.

[0010] Based on the above-mentioned embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the upper sealing structure comprises a blocking ring and a sealing ring which are arranged in a groove between the upper cylindrical section and the transition section, and the lower sealing structure comprises a blocking ring and a sealing ring which are arranged in a groove of the lower cylindrical section, and the upper sealing gasket and the lower sealing gasket are respectively fixed in the inner cavity of the valve body through upper locking covers and lower locking covers.

[0011] Based on the above-mentioned embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the valve body is screw-connected with a fixed seat which is communicated with the P port, the fixed seat is a cylindrical structure and the inner cavity thereof is communicated with the inner cavity of the lower locking cover, the lower locking cover is fixedly connected with the lower sealing gasket at the small-diameter end of the conical port through the inner cavity of the fixed seat, the lower sealing structure is in sliding fit with the inner cavity of the lower locking cover, and one end of the main spring is in abutment with the valve rod through a spring seat and the other end of the main spring is supported through a screw nut which is screw-connected with the fixed seat.

[0012] Based on the above-mentioned embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the upper locking cover is a cylindrical structure with a conical upper port and is screw-connected with the inner cavity of the valve body in a coaxial mode, the outer end of the conical port of the upper end of the upper locking cover is a small-diameter end and has a diameter smaller than the inner diameter of the upper sealing gasket, the inner cavity of the valve body is provided with a step surface for supporting the upper sealing gasket, the step surface is provided with a ring groove for mounting the sealing ring, and the upper sealing gasket is in press-fit with the sealing ring.

[0013] On the basis of the above embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the upper end of the fixed seat is a tapered port, and the outer port is a large-diameter end. The diameter of the inner port of the tapered port at the upper end of the fixed seat is smaller than the inner diameter of the lower sealing gasket. A stepped surface is arranged in the fixed seat for supporting the lower sealing gasket. An annular groove for mounting a sealing ring is formed in the stepped surface. The lower sealing gasket is press-fitted with the sealing ring.

[0014] On the basis of the above embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the inner diameter of the inner cavity of the lower locking cover at the position supporting the lower sealing gasket is equal to the inner diameter of the lower sealing gasket. The inner diameter of the inner cavity of the valve body above the upper sealing gasket is equal to the outer diameter of the upper sealing gasket. The inner hole on the side of the upper sealing gasket close to the upper sealing tapered surface and the inner hole on the side of the lower sealing gasket close to the lower sealing tapered surface are both transitioned with rounded corners.

[0015] On the basis of the above embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, sealing rings are arranged between the inner wall of the valve body and the outer wall of the fixed seat, between the inner wall of the fixed seat and the inner wall of the nut, between the inner wall of the nut and the outer wall of the lower locking cover, between the outer cover and the top cover, between the outer cover and the coil skeleton base body, and between the coil skeleton base body and the valve body. Small holes are arranged on the nut for connecting the spring seat active space with the outside atmosphere.

[0016] On the basis of the above embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the outer wall of the valve body is provided with R-port sealing ring mounting grooves, C-port sealing ring mounting grooves, and P-port sealing ring mounting grooves, all of which are mounted with sealing rings and retaining rings.

[0017] On the basis of the above embodiment, as the preferred technical scheme of the balanced two-position three-way pneumatic electromagnetic valve, the upper sealing gasket and the lower sealing gasket are both made of polyimide. The inner holes on the side of the upper sealing gasket close to the upper sealing tapered surface and on the side of the lower sealing gasket close to the lower sealing tapered surface are both sharp-edged.

[0018] The overall beneficial effects of the above technical schemes are as follows: Realize miniaturization and light weight: Through the balanced design of the valve rod pressure area, the axial force of the medium is offset, and a large-volume electromagnet is not needed, meeting the needs of equipment light weight and miniaturization.

[0019] Improve response speed: The direct-acting structure is adopted, without the secondary reversing process of the pilot type, the response time is short, and it is suitable for scenes with high requirements for control sensitivity.

[0020] Strengthen the sealing reliability: The soft sealing structure of the polyimide sealing gasket and the sealing tapered surface is adopted, and multiple double-sealing designs are matched, so that the leakage is low, and the sealing gasket is wear-resistant and anti-aging, avoiding sealing failure.

[0021] Stable structure and convenient assembly: multiple components are connected by threads, considering structural stability and assembly flexibility, facilitating maintenance and replacement, and reducing use cost.

[0022] Adapting to high-pressure working conditions: the overall structure design adapts to the high-pressure pneumatic control system, and through pressure balance and reinforced sealing design, stable and safe operation under high pressure is ensured.

[0023] The present application has a direct balance structure and high sealing reliability, adopts a direct balance structure, and the medium force acting on the upper and lower ends of the valve rod under on and off state can be balanced, realizing the decoupling of the electromagnetic valve sealing force and the medium pressure; compared with the traditional direct-acting high-pressure electromagnetic valve, the volume of the electromagnet does not need to be increased to improve the magnetic attraction force, and the volume of the electromagnetic valve is greatly reduced, and weight reduction is realized. In addition, compared with the pilot type high-pressure electromagnetic valve, the direct balance structure can greatly improve the opening and closing response time and improve the system sensitivity. The inner sealing structure form of metal cone-plastic sealing surface combined with sealing ring has far smaller leakage than the hard sealing structure of metal cone-metal sealing surface, and at the same time avoids the generation of excess material due to long-term reciprocating operation and collision of metal hard sealing, and improves the sealing reliability. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0025] Figure 1 It is a half-section schematic view of the present application; Explanation of reference numerals: 1-electromagnetic valve; 2-O-ring 1; 3-cover; 4-return spring; 5-moving iron core; 6-top rod; 7-O-ring 2; 8-O-ring 3; 9-valve seat; 10-retainer ring 1; 11-O-ring 4; 12-valve stem; 13-retainer ring 2; 14-O-ring 5; 15-retainer ring 3; 16-O-ring 6; 17-O-ring 7; 18-fixed seat; 19-retainer ring 4; 20-nut; 21-O-ring 8; 22-main spring; 23-lower locking cover; 24-O-ring 9; 25-spring seat; 26-lower sealing gasket; 27-O-ring 10; 28-O-ring 11; 29-retainer ring 5; 30-upper locking cover; 31-upper sealing gasket; 32-O-ring 12; 33-O-ring 13; 34-retainer ring 6; 35-mounting screw.

[0026] Figure 2 It is a top view of the valve body; Figure 3 It is Figure 2 Sectional view of A-A plane; Explanation of reference numerals: 9-1: R port seal ring mounting groove, 9-2: C port seal ring mounting groove, 9-3: P port seal ring mounting groove.

[0027] Figure 4 is a sectional view of the fixed seat; Explanation of reference numerals: 18-1: tool withdrawal groove; 18-2: upper end seal ring mounting groove; 18-3: transition cone.

[0028] Figure 5 is an enlarged view of the valve stem; Explanation of reference numerals: 12-1: lower cylindrical section; 12-2: lower sealing cone; 12-3: upper sealing cone; 12-4: transition section; 12-5: upper cylindrical section. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the core idea of the present application and the following embodiments, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0030] The present application provides these embodiments in order to make the present application thorough and complete, and fully express the scope of the present application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these embodiments should be interpreted as merely exemplary, rather than as limiting.

[0031] It should be noted that, in the description of the present application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", etc. are only for facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] In addition, "first", "second", and similar words used in the present application do not indicate any order, number, or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0033] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0034] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0036] A balanced two-position three-way pneumatic solenoid valve, such as Figures 1 to 5 As shown, the structure includes a valve stem 12 and a valve body 9 that are mutually adapted to each other. Both ends of the valve stem 12 are respectively connected to an electromagnet 1 and a main spring 22. The electromagnet 1 and the main spring 22 in this part of the structure are the same as in the prior art. The electromagnet 1 is used to apply a pushing force to the valve stem 12, and the main spring 22 is also used to apply a pushing force to the valve stem 12, but the directions of the pushing forces are opposite. When the solenoid valve 1 is de-energized, it no longer pushes the valve stem 12, and the main spring 22 can push the valve stem 12 to the corresponding position one. When the solenoid valve 1 is energized, it overcomes the elastic force of the main spring 22 and pushes the valve stem 12 to the corresponding position two.

[0037] Of course, the valve body 9 is provided with P port, C port, and R port that communicate with the inner cavity. As the solenoid valve 1 is energized and de-energized, the valve stem 12 can switch between position one and position two, thereby achieving a two-position three-way function. That is, when the valve stem 12 is in position one, P port and C port are open, and R port is closed; when the valve stem 12 is in position two, P port is closed, and C port and R port are open.

[0038] The cleverness of the present application is that the valve rod 12 comprises a lower cylindrical segment 12-1, a lower sealing cone surface 12-2, an upper sealing cone surface 12-3, a transition segment 12-4, and an upper cylindrical segment 12-5 in sequence, the R port, the C port, and the P port are located between the transition segment 12-4 and the upper sealing cone surface 12-3, between the upper sealing cone surface 12-3 and the lower sealing cone surface 12-2, and between the lower sealing cone surface 12-2 and the lower cylindrical segment 12-1, respectively, and the upper end of the valve rod 12 is provided with an upper sealing structure for preventing the medium from entering the electromagnet 1, the inner cavity between the C port and the R port is provided with an upper sealing gasket 31 matched with the upper sealing cone surface 12-3, the inner cavity between the C port and the P port is provided with a lower sealing gasket 26 matched with the lower sealing cone surface 12-2, and the lower end of the valve rod 12 is provided with a lower sealing structure for preventing the medium from being exhausted, and the upper sealing cone surface 12-3, the lower sealing cone surface 12-2, and the lower cylindrical segment 12-1 have equal areas for bearing the medium pressure in the axial direction.

[0039] When the electromagnetic valve 1 is powered off, the valve rod 12 is pressed against the upper sealing gasket 31 by the elastic force of the main spring 22 against the elastic force of the return spring 4 of the electromagnet 1, and the medium force simultaneously acts on the upper sealing cone surface 12-3 and the lower cylindrical segment 12-1 of the valve rod 12, and since the upper sealing cone surface 12-3 and the lower cylindrical segment 12-1 have equal areas for bearing the medium pressure in the axial direction, force balance can be achieved, at this time, the P port and the C port are conducted, and the R port is cut off.

[0040] When the electromagnetic valve is powered on, the moving iron core 5 of the electromagnetic valve 1 is attracted downward under the electromagnetic force, moves the top rod 6 downward, and further moves the valve rod 12 downward, and the spring force of the return spring 4 overcomes the spring force of the main spring 22 to press the lower sealing gasket 26 downward, and the medium force simultaneously acts on the lower sealing cone surface 12-2 and the lower cylindrical segment 12-1 of the valve rod 12, and since the lower sealing cone surface 12-2 and the lower cylindrical segment 12-1 have equal areas for bearing the medium pressure in the axial direction, force balance can be achieved, at this time, the P port is closed, and the C port and the R port are conducted.

[0041] The present embodiment is the core basic technical scheme of the present application: valve rod structure + port layout + sealing gasket setting: the three segments of the valve rod bear equal pressure areas, can completely balance the axial pressure of the medium, does not need a large suction electromagnet to drive, realizes miniaturization and light weight of the electromagnetic valve; the direct-acting structure is adopted without secondary reversing, has fast response speed, and is suitable for scenes with high control sensitivity requirements; the upper sealing gasket, the lower sealing gasket, and the sealing cone surface form soft sealing, solve the problems of large leakage and fast wear of hard sealing, and improve the sealing reliability and service life; the port layout is reasonable, clearly distinguishes the P port for air intake, the C port for work, and the R port for air exhaust, and ensures that the medium reversing logic is clear and the flow is smooth.

[0042] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way air pressure electromagnetic valve, the electromagnet 1 includes a coil former base body, a coil winding, a reset spring 3, a moving iron core 5, and a top rod 6 provided in the outer cover and the top cover 3. The electromagnet 1 is in abutment with the upper end of the valve rod 12 through the top rod 6. The top rod 6 is a rod-shaped structure with a flat outer circle for air passage. The moving iron core 5 is axially symmetrically provided with an air passage groove for connecting the installation area of the reset spring 3 and the upper end of the valve rod 12.

[0043] The embodiment is a technical solution for optimizing the structure of the electromagnet: top rod + moving iron core design, top rod flat outer circle, moving iron core air passage groove, which can connect the related chambers to achieve air pressure balance and avoid pressure difference hindering the movement of the valve rod; prevent the medium from entering the electromagnet, protect the coil winding and other components, and improve the working stability and service life of the electromagnet; optimize the air flow channel, reduce pressure loss, and further improve the response speed of the electromagnetic valve.

[0044] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way air pressure electromagnetic valve, the upper sealing structure includes a check ring and a sealing ring installed in the groove between the upper cylindrical section 12-5 and the transition section 12-4. The lower sealing structure includes a check ring and a sealing ring installed in the groove of the lower cylindrical section 12-1. The upper sealing gasket 31 and the lower sealing gasket 26 are respectively press-fitted and fixed in the inner cavity of the valve body 9 through the upper locking cover 30 and the lower locking cover 23.

[0045] The embodiment is a preferred technical solution for sealing structure and sealing gasket fixing: upper and lower sealing structures + locking cover: the upper and lower sealing structures adopt a combination of "check ring + sealing ring" to achieve reliable sealing of both ends of the valve rod and prevent medium leakage or intrusion into the electromagnet / spring cavity; the locking cover press-fits the sealing gasket to ensure firm installation of the sealing gasket, avoid displacement during reciprocating motion, and ensure sealing surface fitting accuracy; convenient assembly, easy maintenance of sealing components, and reduced later use cost.

[0046] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way air pressure electromagnetic valve, the valve body 9 is threadedly connected with a fixed seat 18 communicating with the P port. The fixed seat 18 is a cylindrical structure with an inner cavity communicating with the inner cavity of the lower locking cover 23. The lower locking cover 23 press-fits and fixes the lower sealing gasket 26 at the small-diameter end of the tapered port through the inner cavity threadedly connected with the fixed seat 18. The lower sealing structure and the inner cavity of the lower locking cover 23 are in sliding fit. One end of the main spring 22 is in abutment with the valve rod 12 through the spring seat 25, and the other end is supported by the nut 20 threadedly connected with the fixed seat 18.

[0047] The embodiment is a preferred technical solution for fixing seat and main spring installation: fixed seat + lower locking cover + spring support structure.

[0048] The fixed seat is threadedly connected with the valve body, considering structural stability and assembly flexibility, and is suitable for different installation scenes; the lower locking cover is threadedly connected with the fixed seat, which can precisely press the lower sealing gasket to ensure that the sealing surface is tightly attached and reduce the risk of leakage; the main spring is bidirectionally positioned through the nut and spring seat, which is uniformly stressed to ensure that the valve rod is reliably reset and has strong action consistency.

[0049] On the basis of the above embodiment, as a preferred embodiment of the balanced two-position three-way pneumatic electromagnetic valve, the upper locking cover 30 is a cylindrical structure with a tapered upper end and is coaxially threadedly connected with the inner cavity of the valve body 9, the outer end of the tapered upper end of the upper locking cover 30 is a small-diameter end and has a diameter smaller than the inner diameter of the upper sealing gasket 31, the inner cavity of the valve body 9 is provided with a stepped surface for supporting the upper sealing gasket 31, and the stepped surface is provided with an annular groove for installing a sealing ring, and the upper sealing gasket 31 is press-connected with the sealing ring.

[0050] The upper locking cover structure of the embodiment is a preferred technical solution: tapered port + stepped surface + sealing ring.

[0051] The small-diameter end of the tapered port of the upper locking cover limits the displacement of the sealing gasket, the stepped surface cooperates with the sealing ring to form double sealing, and the leakage is further reduced; the coaxial thread connection with the valve body ensures the coaxiality of the upper sealing gasket and the upper sealing tapered surface, and improves the sealing attachment effect; the compact structure does not increase the volume of the electromagnetic valve, and meets the miniaturization design requirement.

[0052] On the basis of the above embodiment, as a preferred embodiment of the balanced two-position three-way pneumatic electromagnetic valve, the upper end of the fixed seat 18 is a tapered port and the outer end is a large-diameter end, the inner end of the tapered port of the upper end of the fixed seat 18 has a diameter smaller than the inner diameter of the lower sealing gasket 26, the fixed seat 18 is provided with a stepped surface inside for supporting the lower sealing gasket 26, and the stepped surface is provided with an annular groove for installing a sealing ring, and the lower sealing gasket 26 is press-connected with the sealing ring.

[0053] The upper end structure of the fixed seat of the embodiment is a preferred technical solution: tapered port + stepped surface + sealing ring.

[0054] The large-diameter end of the tapered port of the fixed seat is suitable for installing the lower sealing gasket, the stepped surface supports the sealing gasket and cooperates with the sealing ring to enhance the sealing reliability of the lower sealing part. It is suitable for high-pressure medium working conditions to avoid sealing failure caused by pressure deformation of the sealing gasket. The wear resistance of the sealing surface is improved, and the service life of the sealing structure is prolonged.

[0055] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way pneumatic electromagnetic valve, the inner diameter of the inner cavity of the lower locking cover 23 at the position supporting the lower sealing gasket 26 is equal to the inner diameter of the lower sealing gasket 26, the inner diameter of the inner cavity of the valve body 9 above the upper sealing gasket 31 is equal to the outer diameter of the upper sealing gasket 31, and the inner hole of the side of the upper sealing gasket 31 close to the upper sealing cone surface 12-3 and the inner hole of the side of the lower sealing gasket 26 close to the lower sealing cone surface 12-2 are both transition fillets.

[0056] The preferred technical solution of the sealing gasket size and the transition fillet is: diameter matching + transition fillet.

[0057] The precise matching of the diameters of the lower locking cover, the valve body and the sealing gasket ensures uniform stress distribution on the sealing surface and avoids local stress concentration. The transition fillet design reduces the collision and friction damage between the sealing cone surface and the sealing gasket, and reduces the risk of metal debris generation. The service life of the sealing gasket and the valve stem is prolonged, and the long-term sealing performance is stable.

[0058] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way pneumatic electromagnetic valve, sealing rings are arranged between the inner wall of the valve body 9 and the outer wall of the fixed seat 18, between the inner wall of the fixed seat 18 and the inner wall of the screw cap 20, between the inner wall of the screw cap 20 and the outer wall of the lower locking cover 23, between the outer cover and the top cover 3, between the outer cover and the coil skeleton base, and between the coil skeleton base and the valve body 9. A small hole is arranged on the screw cap 20 for connecting the spring seat 25 active space with the outside atmosphere.

[0059] The preferred technical solution of this embodiment is all-around sealing and pressure balance: multiple sealing rings + screw cap small hole.

[0060] Sealing rings are arranged on each connection surface to achieve all-around leakage prevention and meet the low leakage demand in high pressure scenarios. The screw cap small hole connects the spring seat space with the atmosphere, balances the pressure in the cavity, and avoids pressure hindering the movement of the valve stem. The action consistency and stability of the electromagnetic valve are improved, and it is suitable for long-term continuous operation conditions.

[0061] On the basis of the above-mentioned embodiment, as a preferred embodiment of the balanced two-position three-way pneumatic electromagnetic valve, the outer wall of the valve body 9 is provided with R-port sealing ring installation groove 9-1, C-port sealing ring installation groove 9-2 and P-port sealing ring installation groove 9-3, each of which is installed with a sealing ring and a retaining ring.

[0062] The preferred technical solution of this embodiment is the sealing groove on the outer wall of the valve body: the specially arranged sealing groove facilitates the installation of the sealing ring, ensuring the reliable connection and sealing of the electromagnetic valve and the external pipeline. It avoids leakage and gas mixing at the interface, ensures the sealing performance and operation stability of the entire pneumatic system, simplifies the pipeline assembly process and improves the installation efficiency.

[0063] Based on the above embodiments, as a preferred embodiment of the balanced two-position three-way pneumatic solenoid valve, the upper sealing gasket 31 and the lower sealing gasket 26 are both polyimide, and the inner hole of the upper sealing gasket 31 near the upper sealing cone surface 12-3 and the inner hole of the lower sealing gasket 26 near the lower sealing cone surface 12-2 are both sharp edges.

[0064] This embodiment presents a preferred technical solution for the sealing gasket material and structure: polyimide material + sharp-edged inner hole.

[0065] Polyimide material is resistant to high temperature, high pressure, and wear, making it suitable for harsh high-pressure working conditions and extending the service life of the gasket; the sharp-edged inner hole design improves the fit between the gasket and the sealing cone surface, further reducing leakage; it enhances the anti-aging ability of the sealing structure and ensures the sealing reliability of the solenoid valve during long-term operation.

[0066] As a preferred embodiment of the present invention, such as Figures 1 to 5 As shown: The main structure includes: electromagnet 1, main spring 22, return spring 4, spring seat 25, moving iron core 5, valve rod 12, valve body, upper sealing gasket 31, lower sealing gasket 26, upper locking cover 30, lower locking cover 23, fixed seat 18, nut 20, sealing ring, retaining ring, mounting screw 35, and top cover 3.

[0067] The valve body 9 adopts a threaded insert structure for easy installation on the valve block. Holes are evenly drilled along the axial direction, corresponding to the P, C, and R ports respectively. The diameter and number of holes can be adjusted according to the required flow diameter. An annular groove is designed at the intersection of the holes to prevent damage to the sealing ring. Sealing ring and retaining ring mounting grooves are provided on both sides of the P, C, and R ports to prevent cross-contamination of airflow.

[0068] Specifically, the outer wall of the valve body 9 is provided with R-port sealing ring mounting groove 9-1, C-port sealing ring mounting groove 9-2, and P-port sealing ring mounting groove 9-3, each for mounting a sealing ring and a retaining ring. The sealing ring is preferably an O-ring.

[0069] There are two P-port sealing ring mounting slots 9-3, located on both sides of the P-port; two retaining rings 3 15 are provided in the P-port sealing ring mounting slot 9-3 adjacent to the C-port, and an O-ring 6 16 is provided between the two retaining rings 3 15; in the P-port sealing ring mounting slot 9-3 on the other side, a retaining ring 3 15 is provided on its outer side, and an O-ring 6 16 is provided on its inner side.

[0070] There is one C-port sealing ring mounting groove 9-2, located between the C-port and the R-port; inside the C-port sealing ring mounting groove 9-2, a retaining ring 2 13 is provided on the side facing the R-port, and an O-ring 5 14 is provided on the side facing the C-port.

[0071] The C-port sealing ring installation groove 9-2 and the R-port sealing ring installation groove 9-1 are respectively arranged at the two sides of the R-port. In the R-port sealing ring installation groove 9-1, an O-ring four 11 is installed at one side facing the R-port, and a check ring one 10 is installed at the other side.

[0072] The upper locking cover 30 is screwed into the valve body 9 by screwing, and the upper sealing gasket 31 and the sealing ring twelve 32 are compressed. That is, the upper locking cover 30 is a cylindrical structure with a tapered upper end and is coaxially screwed with the inner cavity of the valve body 9. The outer end of the tapered upper end of the upper locking cover 30 is a small-diameter end and has a smaller diameter than the inner diameter of the upper sealing gasket 31. The inner cavity of the valve body 9 is provided with a stepped surface for supporting the upper sealing gasket 31, and the stepped surface is provided with an annular groove for installing the sealing ring twelve 32. The upper sealing gasket 31 is in compression fit with the sealing ring twelve 32.

[0073] The fixed seat 18 is integrally connected with the valve body 9 by screwing, and is designed with evenly distributed air holes in the axial direction, the number of which is not less than 6. The upper end is designed with a 90° taper transition to reduce flow resistance. The check ring five 29 and the O-ring eleven 28 are installed on the upper end of the fixed seat 18 to prevent high-pressure medium from directly passing through the C-port. The check ring four 19 and the O-ring seven 17 are installed at the relief groove 18-1 position to prevent high-pressure medium from directly communicating with the atmosphere.

[0074] Preferably, the valve body 9 is provided with a stepped surface for positioning the fixed seat 18. The stepped surface is matched with the upper end sealing ring installation groove 18-2 of the upper end of the fixed seat 18. Two check rings five 29 are arranged in the upper end sealing ring installation groove 18-2, and the O-ring eleven 28 is arranged between the two check rings five 29. The lower end of the fixed seat 18 is provided with a lower end sealing ring installation groove. The check ring four 19 and the O-ring seven 17 are arranged between the lower end sealing ring installation groove and the valve body 9.

[0075] The upper end of the fixed seat 18 is a tapered port, and the outer end is a large-diameter end, which is referred to as a transition cone 18-3. The inner diameter of the inner end of the transition cone 18-3 is smaller than the inner diameter of the lower sealing gasket 26. The fixed seat 18 is provided with a stepped surface for supporting the lower sealing gasket 26. The stepped surface is provided with an annular groove for installing the O-ring ten 27. The lower sealing gasket 26 is in compression fit with the O-ring ten 27.

[0076] The lower locking cover 23 is compressed and connected with the fixed seat 18 by screwing, and the lower sealing gasket 26 and the O-ring ten 27 are compressed. That is, the lower locking cover 23 is connected with the inner cavity of the fixed seat 18 by screwing, and the lower sealing gasket 26 is compressed and fixed on the stepped surface of the small-diameter end of the transition cone 18-3.

[0077] The nut 20 is fixedly connected with the lower locking seat 23 by screwing, and the O-ring eight 20 and the O-ring nine 24 are compressed while the main spring 22 is compressed. A small hole is arranged in the middle of the nut 20 to communicate with the atmosphere to prevent the valve stem 12 from moving and being blocked.

[0078] The lower sealing structure is in sliding fit with the inner cavity of the lower locking cover 23, the lower sealing gasket 26, O-ring 27 and O-ring 28 are located between the P port and the C port, for preventing gas mixing; the O-ring 17, O-ring 20, O-ring 24 and the lower sealing structure are located on the other side of the P port away from the C port, for preventing gas leakage.

[0079] The electromagnet is composed of a coil frame base, a coil winding and an outer cover. The outer cover, the frame base and the valve body 9 are fixed by four mounting screws 35, and the seal ring is used to prevent external air from entering the electromagnet. The outer cover is filled with glue from the glue filling hole to the cavity of the coil winding and the outer cover.

[0080] The armature 5 is provided with an air passage in axial symmetry to prevent pressure build-up caused by armature movement. The reset spring 4 is interposed between the cover 3 and the armature 5 and is installed in the spring hole of the armature 5 to provide an armature reset force for pressing the top rod 6 and the valve rod 12. The outer circle of the top rod 6 is milled flat to serve as an air passage.

[0081] The valve rod 12 comprises a lower cylindrical segment 12-1, a lower sealing conical surface 12-2, an upper sealing conical surface 12-3, a transition segment 12-4 and an upper cylindrical segment 12-5. The two sealing conical surfaces have a conical angle of 90°. The upper sealing conical surface 12-2 presses the upper sealing gasket 31 to achieve sealing when power is off, and the lower sealing conical surface 12-3 presses the lower sealing gasket 26 to achieve sealing when power is on. The diameter of the lower cylindrical segment 12-1 is equal to the inner hole diameter of the lower sealing gasket 26, and the diameter of the upper cylindrical segment 12-5 is equal to the inner hole diameter of the upper sealing gasket 31. O-ring 32 and stop ring 6 are installed on the upper end of the valve rod 12 to form an upper sealing structure and slide sealingly fit with the inner cavity of the valve body 9 to prevent high-pressure medium from entering the armature movement cavity. Another sealing ring and stop ring are installed on the lower end of the valve rod 12 to form a lower sealing structure to prevent high-pressure medium from being directly emptied.

[0082] Preferably, the materials of the upper sealing gasket 31 and the lower sealing gasket 26 are polyimide, and the inner hole of the side close to the sealing conical surface is sharp.

[0083] The details of the present application are well known to those skilled in the art.

[0084] The above shows and describes the basic principles, main features and beneficial effects of the present application. The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A balanced two-position three-way pneumatic solenoid valve, comprising a valve stem (12) and a valve body (9) adapted to each other, wherein the two ends of the valve stem (12) are respectively connected to an electromagnet (1) and a main spring (22), characterized in that: The valve body (9) has a P port, a C port, and an R port communicating with the inner cavity. The valve stem (12) includes a lower cylindrical section (12-1), a lower sealing cone surface (12-2), an upper sealing cone surface (12-3), a transition section (12-4), and an upper cylindrical section (12-5). The R port, C port, and P port are located between the transition section (12-4) and the upper sealing cone surface (12-3), between the upper sealing cone surface (12-3) and the lower sealing cone surface (12-2), and between the lower sealing cone surface (12-2) and the lower cylindrical section (12-1), respectively. (12) An upper sealing structure is provided at the upper end to prevent the medium from entering the electromagnet (1). An upper sealing gasket (31) adapted to the upper sealing cone surface (12-3) is provided in the inner cavity between the C port and the R port. A lower sealing gasket (26) adapted to the lower sealing cone surface (12-2) is provided in the inner cavity between the C port and the P port. A lower sealing structure is provided at the lower end of the valve rod (12) to prevent the medium from being discharged. The areas of the upper sealing cone surface (12-3), the lower sealing cone surface (12-2), and the lower cylindrical section (12-1) that bear the medium pressure in the axial direction are equal.

2. The balanced two-position three-way pneumatic solenoid valve according to claim 1, characterized in that: The electromagnet (1) includes a coil frame base, coil winding, reset spring (3), moving iron core (5), and push rod (6) disposed in the outer cover and top cover (3). The electromagnet (1) is connected to the upper end of the valve rod (12) through the push rod (6). The push rod (6) is a rod-shaped structure with an outer diameter milled flat for ventilation. The moving iron core (5) is axially symmetrically provided with air passage grooves for connecting the installation area of ​​the reset spring (3) and the upper end of the valve rod (12).

3. The balanced two-position three-way pneumatic solenoid valve according to claim 1 or 2, characterized in that: The upper sealing structure includes a retaining ring and a sealing ring installed in the groove between the upper cylindrical section (12-5) and the transition section (12-4). The lower sealing structure includes a retaining ring and a sealing ring installed in the groove of the lower cylindrical section (12-1). The upper sealing gasket (31) and the lower sealing gasket (26) are respectively pressed and fixed in the inner cavity of the valve body (9) by the upper locking cover (30) and the lower locking cover (23).

4. The balanced two-position three-way pneumatic solenoid valve according to claim 3, characterized in that: The valve body (9) is threadedly connected to a fixed seat (18) that communicates with the P port. The fixed seat (18) is a cylindrical structure and its inner cavity communicates with the inner cavity of the lower locking cover (23). The lower locking cover (23) presses and fixes the lower sealing gasket (26) to the small diameter end of the conical opening by threading it to the inner cavity of the fixed seat (18). The lower sealing structure slides in cooperation with the inner cavity of the lower locking cover (23). One end of the main spring (22) is abutted against the valve rod (12) through the spring seat (25), and the other end is supported by the nut (20) that is threadedly connected to the fixed seat (18).

5. The balanced two-position three-way pneumatic solenoid valve according to claim 4, characterized in that: The upper locking cover (30) is a cylindrical structure with a tapered upper end and is coaxially threaded to the inner cavity of the valve body (9). The outer end of the tapered opening at the upper end of the upper locking cover (30) is a small diameter end and its diameter is smaller than the inner diameter of the upper sealing gasket (31). The inner cavity of the valve body (9) is provided with a stepped surface for supporting the upper sealing gasket (31). An annular groove for installing the sealing ring is opened on the stepped surface. The upper sealing gasket (31) and the sealing ring are press-fitted together.

6. The balanced two-position three-way pneumatic solenoid valve according to claim 4 or 5, characterized in that: The upper port of the fixed seat (18) is a tapered opening and the outer port is a large-diameter end. The diameter of the inner port of the tapered opening at the upper end of the fixed seat (18) is smaller than the inner diameter of the lower sealing gasket (26). The fixed seat (18) is provided with a stepped surface for supporting the lower sealing gasket (26). An annular groove for installing the sealing ring is opened on the stepped surface. The lower sealing gasket (26) is pressed into the sealing ring.

7. The balanced two-position three-way pneumatic solenoid valve according to claim 6, characterized in that: The inner diameter of the lower locking cover (23) supporting the lower sealing gasket (26) is equal to the inner diameter of the lower sealing gasket (26). The inner diameter of the valve body (9) above the upper sealing gasket (31) is equal to the outer diameter of the upper sealing gasket (31). The inner hole of the upper sealing gasket (31) near the upper sealing cone surface (12-3) and the inner hole of the lower sealing gasket (26) near the lower sealing cone surface (12-2) are both transition rounded corners.

8. The balanced two-position three-way pneumatic solenoid valve according to any one of claims 4, 5, and 7, characterized in that: Sealing rings are provided between the inner wall of the valve body (9) and the outer wall of the fixed seat (18), between the inner wall of the fixed seat (18) and the inner wall of the nut (20), between the inner wall of the nut (20) and the outer wall of the lower locking cover (23), between the outer cover and the top cover (3), between the outer cover and the coil frame base, and between the coil frame base and the valve body (9). A small hole is provided on the nut (20) to connect the moving space of the spring seat (25) with the outside atmosphere.

9. The balanced two-position three-way pneumatic solenoid valve according to claim 8, characterized in that: The outer wall of the valve body (9) is provided with R-port sealing ring mounting groove (9-1), C-port sealing ring mounting groove (9-2), and P-port sealing ring mounting groove (9-3), which are used to install sealing rings and retaining rings.

10. The balanced two-position three-way pneumatic solenoid valve according to any one of claims 1, 2, 4, 5, and 7, characterized in that: Both the upper sealing gasket (31) and the lower sealing gasket (26) are made of polyimide. The inner hole of the upper sealing gasket (31) near the upper sealing cone surface (12-3) and the inner hole of the lower sealing gasket (26) near the lower sealing cone surface (12-2) are both sharp edges.

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