Miniature electromagnetic valve

Abstract

The utility model discloses a miniature electromagnetic valve which comprises a valve body, a coil assembly, an iron core assembly, a sleeve and a valve core assembly, in the scheme, the structure of the electromagnetic valve is improved, a first channel, a second channel and a third channel form a three-way structure, and the elastic force of a first elastic piece in the iron core assembly and the elastic force of a second elastic piece in the valve core assembly, the matching relation with a movable iron core and the like are limited. The first channel, the second channel and the third channel can be used as air inlets, the air path reversing performance is improved, and the pressure application range is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of valve devices, in particular to a micro electromagnetic valve. Background Art

[0002] The application field of micro solenoid valves is wide. Common structures include valve body, valve core assembly, iron core assembly, and coil assembly. The valve core assembly is installed in the valve body cavity, and the coil assembly is sleeved on the iron core assembly. The moving iron core in the iron core assembly cooperates with the corresponding spring to drive the corresponding sealing component of the valve core assembly to move, so that the corresponding channel on the valve body is connected. The defect is that due to the unreasonable design, the predetermined channel must be selected as the air inlet when the solenoid valve is used, and the air path switching performance is low, which needs to be improved. Utility Model Content

[0003] To solve at least one of the above technical deficiencies, the present invention provides the following technical solutions:

[0004] The present application document discloses a micro electromagnetic valve, including a valve body, a coil assembly, an iron core assembly, a sleeve, and a valve core assembly. The iron core assembly is in the sleeve cavity and a coil assembly is arranged outside the sleeve, and the valve core assembly is in the valve body cavity; the iron core assembly includes a matching elastic member 1, a moving iron core, and a static iron core. Channel 1 and channel 2 are arranged on the valve body to connect the valve body cavity with the outside world through channel 1 and channel 2. The valve core assembly is arranged at the orifice in the cavity of channel 1 to block or open the orifice in the cavity. Channel 3 is arranged on the valve body, and the valve core assembly includes a matching valve core seat and a valve core. The valve core includes an elastic member 2, a sealing plug and a connecting cover sleeved on the sealing plug. An elastic member 2 is arranged between the sealing plug and the cavity wall. The moving iron core is connected to the connecting cover in the valve core; a cavity is formed in the valve core seat, and the orifice at one end of the cavity is located at its peripheral wall and the orifice at the other end is located at the end face of the end portion, and the cavity orifice at the end face is within the stroke range of the sealing plug, and the sealing plug is used to seal or open the cavity orifice at the end face; the channel three is connected with the cavity orifice at the peripheral wall of the valve core seat. Under normal conditions, the elastic force of the elastic part one is greater than the elastic force of the elastic part two so that the sealing plug blocks the orifice of channel one, and channel two and channel three are connected with the valve core seat cavity in the valve body cavity. Under working conditions, the moving iron core moves to overcome the elastic force of the elastic part one, and the elastic part two pushes the sealing plug to move to seal the cavity orifice at the end face, and simultaneously opens the orifice of channel one in the cavity, and channel one and channel two are connected in the valve body cavity.

[0005] In this solution, the structure of the solenoid valve is improved, and a three-way configuration is formed by channel one, channel two, and channel three. The elastic force of the elastic part one in the iron core assembly and the elastic part two in the valve core assembly, as well as the matching relationship with the moving iron core, are limited, so that channel one, channel two, and channel three can all be used as air inlets, the air path switching performance is improved, and the applicable range of pressure is increased.

[0006] Furthermore, the openings of the channel 1, channel 2, and channel 3 are located on the same side of the valve body, which facilitates docking with other functional mechanisms.

[0007] Furthermore, a groove one is provided on the peripheral wall of the valve core seat and the peripheral wall orifice of the cavity is in the groove one, a sealing member is provided on the peripheral wall of the valve core seat, the sealing member abuts against the valve body cavity wall and the groove one is in a sealed space surrounded by the sealing member and the valve body cavity wall, the cavity orifice of the channel three is in the sealed space, which facilitates operation to disconnect or connect the channels.

[0008] Furthermore, cylindrical fixed blocks are provided at the openings of channel one, channel two, and channel three connected to the outside world. The cylindrical openings of the fixed blocks correspond to the openings and a filter is provided at the cylindrical openings. Adding the filter prevents impurities in the gas or liquid from entering and causing the moving iron core to become stuck, thereby helping to improve safety.

[0009] Furthermore, it also includes a cover plate, which is located between the valve body and the coil assembly. The cover plate is fixed to the cavity of the valve body by fasteners. The cover plate is fitted with the sleeve and the cover plate and the valve body cavity wall cooperate to clamp the end of the sleeve. The cover plate is fixed to the valve body by fasteners and cooperates to hold and fix the sleeve, which is convenient for assembly. The fasteners can be threaded or interlocked with the valve body.

[0010] Furthermore, the fastener is threadedly connected to the valve body, and the threaded connection is convenient for disassembly.

[0011] Furthermore, a second groove is provided on the peripheral surface of the cover plate, and a protrusion is provided on the end surface of the coil assembly, and the protrusion is embedded and fixed in the second groove. Adding the docking and fixing of the groove and the protrusion facilitates assembly and improves vibration resistance.

[0012] Furthermore, a placement cavity is provided at the movable iron core and a guide pin is provided in the placement cavity. The elastic member of the placement cavity is sleeved on the guide pin. The guide pin is connected to the static iron core to guide the movement of the elastic member, thereby helping to extend the life of the spring.

[0013] Furthermore, a push rod is provided at the end of the moving iron core, and the push rod passes through the hole formed at the valve core seat and abuts against the connecting cover in the valve core, thereby improving the docking structure between the moving iron core and the valve core. The valve core is docked by the push rod, which facilitates the realization of motion connection and helps reduce the difficulty of processing the moving iron core.

[0014] Furthermore, the orifice of the channel 1 in the valve body cavity is convexly formed, the elastic member 2 is sleeved on the convex orifice and the end of the elastic member 2 is in contact with the sealing plug in the valve core cavity. The convexly formed orifice facilitates the placement of the elastic member 2 and helps to improve the stability of the placement of the elastic member 2.

[0015] Furthermore, an open groove is provided at the cavity wall around the valve core, and the orifice of the second channel is located at the groove wall of the open groove, thereby optimizing the air flow channel and improving the stability of the connection between the first channel and the second channel.

[0016] Furthermore, the valve core seat bulges outward toward the middle of the end face of the valve core and the orifice of the cavity is located at the bulging part, and a through hole is provided at the connecting cover corresponding to the bulging part. The through hole meets the insertion of the bulging part to abut against the sealing plug, thereby facilitating the cooperation between the sealing plug and the cavity at the valve core seat, such as sealing the orifice of the cavity with the sealing plug.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The utility model improves the structure of the solenoid valve, has a three-way configuration, and each channel can be used as an air inlet according to usage requirements, thereby improving the gas path reversing performance and increasing the pressure usage range.

[0019] 2. The utility model improves the structure of the electromagnetic valve, and the butt joint of the ejector rod facilitates the butt joint between the moving iron core and the valve core, and helps to reduce the difficulty of machining the moving iron core.

[0020] 3. The utility model installs filters in channel 1, channel 2, and channel 3 to prevent impurities from entering, improve the stability of the moving iron core operation, and help improve safety.

[0021] 4. In the present invention, the cover plate is connected to the valve body by fasteners. The fasteners, such as threaded ones, are convenient for assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the overall structure of the micro solenoid valve in Example 1;

[0024] Figure 2 is a schematic cross-sectional structural diagram of the micro solenoid valve in Example 1;

[0025] Figure 3 is a schematic cross-sectional structural diagram of the micro solenoid valve in Example 1;

[0026] Figure 4 Schematic diagram of the connection structure between the cover plate and the valve body in Example 1;

[0027] Wherein, the accompanying drawings are marked as follows:

[0028] 1. Channel 1; 2. Channel 2; 3. Channel 3; 4. Elastic part 2; 5. Sealing plug; 6. Connecting cover; 7. Valve core seat; 8. Fixing block; 9. Filter screen; 10. Sealing ring; 11. Sleeve; 12. Cover plate; 13. Opening groove; 14. Moving iron core; 15. Cavity; 16. Guide pin; 17. Push rod; 18. Coil assembly; 19. Static iron core; 20. Valve body; 21. Sealing part; 22. Elastic part 1; 23. Groove 1; 24. Fastener; 121. Groove 2; 181. Bump. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figures 1-4 As shown, the micro solenoid valve in this example includes a valve body 20, a coil assembly 18, an iron core assembly, a sleeve 11, and a valve core assembly. The iron core assembly is located within the sleeve 11 cavity, with the coil assembly 18 mounted outside the sleeve 11. The valve core assembly is located within the valve body 20 cavity. The iron core assembly includes a matching elastic member 22, a movable iron core 14, and a stationary iron core 19. The movable iron core 14 and the stationary iron core 19 are located within the sleeve 11 cavity. An elastic member 22 is positioned between the movable iron core 14 and the stationary iron core 19, acting as a spring. The sleeve 11 has its tail end located within the coil assembly 18 cavity and its head end located within the valve body 20 cavity.

[0032] In this example, the valve core assembly includes a matching valve core seat 7 and a valve core. The valve core includes an elastic member 24, a sealing plug 5, and a cylindrical connecting cover 6 that fits over the sealing plug 5. The movable iron core 14 is connected to the connecting cover 6 in the valve core. The valve core seat 7 is located between the movable iron core 14 and the valve core. The valve core seat 7 is clamped and fixed within the valve body cavity by the cavity wall of the valve body 20 in front of it and the front end of the sleeve 11 behind it. The valve core is located in the valve body cavity in front of the valve core seat 7, with the connecting cover 6 facing the valve core seat 7. An elastic member 24 is placed between the sealing plug 5 and the axially corresponding cavity wall. The elastic member 24 is like a common spring, with one end of the elastic member 24 abutting the cavity wall and the other end abutting the tail end face of the sealing plug 5.

[0033] In this example, the valve body 20 is formed with channel 1, channel 2, and channel 3, which connect the cavity of the valve body 20 with the outside world. A valve core is placed at the opening of the cavity of channel 1, and a sealing plug 5 in the valve core is used to block or open the opening of the cavity. The openings of channel 1, channel 2, and channel 3 that connect to the outside world are located on the same side or different sides of the valve body, preferably as shown in FIG. Figure 1 As shown, the orifices of channel 1 1 , channel 2 2 , and channel 3 3 that are connected to the outside world are on the same side of the valve body 20 . If the orifices of channel 1 1 , channel 2 2 , and channel 3 3 are formed in sequence along the length direction of the solenoid valve, it will be more aesthetically pleasing and convenient for docking with external mechanisms.

[0034] In this example, the valve core seat 7 is cylindrical, with a cavity 15 formed therein. The cavity 15 has an opening at one end located on the valve core seat's peripheral wall and an opening at the other end located on the end face. The cavity opening of channel 3 3 communicates with the opening on the peripheral wall of cavity 15. For example, a groove 1 23 is formed circumferentially along the peripheral wall of the valve core seat, and the opening of cavity 15 located on the peripheral wall is located within this groove 1 3. O-rings are sleeved on the peripheral walls of the valve core seat before and after the groove 1 23. The O-rings serve as sealing members 21, and the O-rings contact the corresponding circumferential walls of the valve body to enclose a sealed space. The groove 1 23 is located within the sealed space, and the cavity opening of channel 3 3 is located on the valve body wall within the sealed space. Channel 3 3 communicates with cavity 15 and thus with the interior of the valve body 20. Of course, a groove of a predetermined length can also be formed at a predetermined position on the peripheral wall of the valve body 20, and a sealing member, such as an O-ring, can be placed around the groove. The groove is in the ring opening of the O-ring, and the O-ring cooperates with the valve body cavity wall to form a sealed space. The shape of the groove can be selected according to needs.

[0035] The cavity opening at the end face of the valve core seat 7 faces the valve core and is within the travel range of the sealing plug 5, allowing the sealing plug 5 to block or open the cavity opening at this end face. To facilitate sealing the opening with the sealing plug, in this example, the valve core seat 7 is convex toward the center of the end face of the valve core, with the cavity 15 opening located at this convex portion. A through-hole is formed in the connecting cover 6 corresponding to this convex portion. The through-hole allows the convex portion to be inserted into the through-hole to abut against the sealing plug, thereby sealing the cavity 15 opening with the sealing plug 5. Of course, the sealing plug can also be made to protrude from the connecting cover to facilitate abutment and blocking of the cavity opening at the end face of the valve core seat.

[0036] During use, in the normal state (i.e. when not powered), the elastic force of elastic member 1 22 is greater than the elastic force of elastic member 2 4, and the moving iron core 14 pushes the connecting cover 6 to move, and simultaneously moves the sealing plug 5 to abut the orifice in the cavity of channel 1 1 to form a blockage. In this state, channel 2 2 is connected with the cavity of valve body 20, the orifice of cavity 15 at the end face of valve core seat 7 is connected with the cavity of valve body 20, channel 3 3 is connected with a sealed space in the groove, and channel 3 3 and channel 2 2 are connected through the cavity 15 of valve core seat 7.

[0037] In the working state (i.e. when energized), the coil assembly 18 is energized, the moving iron core 14 moves toward the static iron core 19, the moving iron core 14 moves backward to overcome the elastic force of the elastic member 1 22, the elastic member 2 4 pushes the sealing plug 5 and the connecting cover 6 to move, the orifice of channel 1 in the cavity is opened to connect with the valve body cavity in a passage state, the sealing plug 5 abuts against the orifice of the cavity 15 at the end face of the valve core seat 7 to form a blockage, the connection between channel 3 3 and the cavity of the valve body 20 is in a disconnected state, and the connection between channel 1 1 and channel 2 2 is in a passage state.

[0038] When in use, you can choose to use channel one as the air inlet, channel two as the working port, and channel three as the exhaust port according to your needs; or, channel one as the exhaust port, channel two as the air inlet, and channel three as the working port; or, channel one as the exhaust port, channel two as the working port, and channel three as the air inlet.

[0039] For the docking of the moving iron core and the connecting cover, Figure 2 As shown, a push rod 17 is mounted at the end of the movable iron core 14. The push rod 17 passes through a hole formed in the valve core seat 7 and abuts against the connecting cover 6 in the valve core. The push rod connects the valve core, simplifies the connection structure, simplifies the structure of the movable iron core, and reduces the difficulty of manufacturing. The number of push rods can be single, two, or more.

[0040] To guide elastic member 1, a cavity is formed on the end face of movable iron core 14 facing static iron core 19. A guide pin 16 is positioned within the cavity. Elastic member 1 22 in the cavity fits over guide pin 16 to guide its expansion and contraction. The tail end of guide pin 16 is secured to static iron core 19, helping to extend the life of the spring. Correspondingly, the opening of channel 1 1 within the cavity of valve body 20 can also be formed to be convex. Elastic member 2 4 fits over this convex opening, with its end abutting against sealing plug 10. This convex opening facilitates the placement and guidance of elastic member 2, improving its stability and lifespan.

[0041] To facilitate the fixing of the sleeve, a cover plate 12 is added in this example. The cover plate 12 is located between the valve body 20 and the coil assembly 18. The cover plate 12 is fixed to the cavity of the valve body 20 by fasteners 24. The cover plate 12 is fitted over the sleeve 11, and the end of the sleeve 11 in front of the cover plate 12 is located in the cavity of the valve body 20. The end of the sleeve 11 in the cavity is clamped and fixed by the cavity wall of the valve body 20 and the cover plate 12. The coil assembly 18 is placed outside the sleeve 11 behind the cover plate 12. For fasteners, such as bolts, threaded holes are formed on the end face of the valve body 20. The bolts cooperate with the threaded holes to fix the cover plate 12 to the end face of the valve body 20. The number of bolts can be two, three, or four, etc., to facilitate disassembly and maintenance.

[0042] A second groove 121 can also be formed on the peripheral surface of the cover plate 12. For example, if a second groove is formed at a relative position, a protrusion 181 is provided at the end face of the coil assembly 18. The protrusion 181 is embedded and fixed in the second groove 121, which is convenient for docking and fixing with the coil assembly and improves vibration resistance.

[0043] An opening groove 13 can also be formed at the cavity wall of the valve body 20 around the valve core. For example, if the cavity wall of the valve body is stepped, a groove is formed at the end of the step around the valve core and the groove mouth extends to the end face of the step section to form an opening groove 13. The orifice of channel two is located at the groove wall of the opening groove, which helps to optimize the airflow channel and improve stability.

[0044] To prevent the ingress of impurities, cylindrical fixing blocks 8 are fixed to the openings of channels 1, 2, and 3, which communicate with the outside world. The openings of fixing blocks 8 correspond to the openings, and a filter screen 9 is fixed to the openings. This prevents the ingress of impurities in the gas or liquid, prevents the moving iron core from getting stuck, and improves safety. To enhance the sealing performance of the docking, a sealing ring 10 is placed on the valve body surface around the opening of fixing block 8, with the opening of fixing block 8 positioned within the ring opening of the sealing ring.

[0045] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A micro electromagnetic valve, comprising a valve body (20), a coil assembly (18), an iron core assembly, a sleeve (11), and a valve core assembly, wherein the iron core assembly is located in the sleeve (11) cavity and the coil assembly (18) is arranged outside the sleeve (11), and the valve core assembly is located in the valve body (20) cavity; the iron core assembly comprises a matching elastic member 1 (22), a moving iron core (14), and a static iron core (19); a channel 1 (1) and a channel 2 (2) are arranged on the valve body (20), and the channel 1 (1) and the channel 2 (2) are used to connect the valve body (20) cavity with the outside world; the valve core assembly is arranged at the orifice in the cavity of the channel 1 (1) to block or open the orifice in the cavity, and the invention is characterized in that: The valve body (20) is provided with a third channel (3), the valve core assembly includes a matching valve core seat (7) and a valve core, the valve core includes an elastic member (4), a sealing plug (5) and a connecting cover (6) sleeved on the sealing plug, the elastic member (4) is provided between the sealing plug (5) and the cavity wall, the moving iron core (14) is connected to the connecting cover (6) in the valve core; a cavity (15) is formed in the valve core seat (7), the orifice of one end of the cavity (15) is located at its peripheral wall and the orifice of the other end is located at the end face of the end, the orifice of the cavity (15) at the end face is within the stroke range of the sealing plug (5), and the sealing plug (5) is used to block or open the cavity at the end face. The cavity (15) orifice of the channel three (3) is connected with the cavity orifice at the peripheral wall of the valve core seat (7). Under normal conditions, the elastic force of the elastic member one (22) is greater than the elastic force of the elastic member two (4) so ​​that the sealing plug (5) blocks the cavity of the channel one (1). The channel two (2) and the channel three (3) are connected in the cavity of the valve body (20) through the cavity (15) of the valve core seat (7). Under working conditions, the movable iron core (14) moves to overcome the elastic force of the elastic member one (22). The elastic member two (4) pushes the sealing plug (5) to move to block the cavity orifice at the end face, and simultaneously opens the cavity orifice of the channel one (1). The channel one (1) and the channel two (2) are connected in the cavity of the valve body.

2. The micro solenoid valve according to claim 1, wherein: The openings of the channel one (1), the channel two (2), and the channel three (3) are located on the same side of the valve body (20).

3. The micro solenoid valve according to claim 1, wherein: A groove one (23) is provided on the peripheral wall of the valve core seat (7) and the peripheral wall opening of the cavity (15) is located in the groove one (23). A sealing member (21) is provided on the peripheral wall of the valve core seat (7), so that the sealing member (21) abuts against the cavity wall of the valve body and the groove one (23) is located in a sealed space surrounded by the sealing member (21) and the cavity wall of the valve body (20), and the cavity opening of the channel three (3) is located in the sealed space.

4. The micro solenoid valve according to claim 1, wherein: A cylindrical fixed block (8) is provided at the openings of channel 1 (1), channel 2 (2) and channel 3 (3) communicating with the outside world. The openings of the fixed block (8) correspond to the openings and a filter screen (9) is provided at the openings.

5. The micro solenoid valve according to claim 1, wherein: The valve body (20) and the coil assembly (18) are provided with a cover plate (12). The cover plate (12) is fixed to the cavity of the valve body (20) by a fastener (24). The cover plate (12) and the sleeve (11) are fitted together, and the cover plate (12) and the cavity wall of the valve body (20) cooperate to clamp the end of the sleeve (11).

6. The micro solenoid valve according to claim 5, characterized in that: The fastener (24) is threadedly connected to the valve body (20).

7. The micro solenoid valve according to claim 5, wherein: A second groove (121) is provided on the peripheral surface of the cover plate (12), and a convex block (181) is provided on the end surface of the coil assembly (18), and the convex block (181) is embedded and fixed in the second groove (121).

8. The micro solenoid valve according to claim 1, wherein: A placement cavity is provided at the movable iron core (14) and a guide pin (16) is provided in the placement cavity. An elastic member (22) of the placement cavity is sleeved on the guide pin (16), and the guide pin (16) is connected to the static iron core (19).

9. The micro solenoid valve according to claim 1, wherein: A push rod (17) is provided at the end of the moving iron core (14), and the push rod (17) passes through a hole formed at the valve core seat and abuts against a connecting cover (6) in the valve core.

10. The micro solenoid valve according to claim 1, wherein: The opening of the channel 1 (1) in the cavity of the valve body (20) is formed in a convex shape, and the elastic member 2 (4) is sleeved on the convex opening and the end of the elastic member 2 (4) is in contact with the sealing plug (5); Alternatively, an opening groove (13) is provided on the cavity wall around the valve core, and the orifice of the second channel is located on the groove wall of the opening groove; Alternatively, the valve core seat (7) bulges outward toward the middle of the end face of the valve core and the orifice of the cavity (15) is located at the bulging portion, and a through hole is provided at the connecting cover (6) corresponding to the bulging portion, and the through hole meets the insertion of the bulging portion to abut against the sealing plug (5).

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