Miniature three-way valve

Abstract

The present application relates to a kind of micro three-way valves, including the base formed with first gas outlet, the upper shell formed with second gas outlet and air inlet, the outer magnet fixed in the inner side of upper shell, the plug support being arranged in the inner side of outer magnet, the coil being fixed on plug support, the flexible plug being fixed on plug support,And elastic support assembly is connected between plug support and base or between plug support and upper shell.When coil is energized, plug support can be driven to move between first gas outlet and second gas outlet, so that the flexible plug plugs one of first gas outlet and second gas outlet.The micro three-way valve of the present application has the advantages of high driving efficiency, high magnetic force utilization rate, not easy to be disturbed by external magnetic field, and good stability.

Description

TECHNICAL FIELD

[0001] The present application relates to a gas valve, in particular to a micro three-way valve. BACKGROUND

[0002] The current micro three-way valve usually adopts a coil as a stator, a magnet and a magnetic guide structure as a rotor, which has the disadvantages of low driving efficiency, weak driving force and easy to be disturbed by external magnetic field. SUMMARY

[0003] The present application aims to provide a micro three-way valve with high driving efficiency.

[0004] A micro three-way valve, comprising: a base, a first gas outlet is formed on the base; an upper shell connected with the base to define a receiving space, which comprises a top plate and a side wall extending from the periphery of the top plate, a second gas outlet is arranged on the top plate; the first gas outlet and the second gas outlet are located on the same straight line or on parallel straight lines; an air inlet is arranged on the side wall of the upper shell or the base; an outer magnet is fixed inside the upper shell; a plug holder is arranged inside the outer magnet; a coil fixed on the plug holder is opposite to the outer magnet in space; a flexible plug fixed on the plug holder; and an elastic support assembly connected between the plug holder and the base or the upper shell. Wherein, the elastic support assembly allows the plug holder to move between the first gas outlet and the second gas outlet; when the coil is powered, the plug holder can be driven to move between the first gas outlet and the second gas outlet, so that the flexible plug blocks one of the first gas outlet and the second gas outlet.

[0005] As an embodiment, the plug holder comprises: a fixed block formed with a through hole, the flexible plug is fixed in the through hole and protrudes from both ends of the fixed block; and a hollow frame arranged on the outer periphery of the fixed block and connected with the fixed block. Wherein, the coil is fixed on the outer surface of the side wall of the frame; in the direction parallel to the central axis of the through hole of the fixed block, a receiving groove is formed between the fixed block and the frame for inserting external objects or a space in the frame is not occupied by the fixed block to form a receiving groove for inserting external objects.

[0006] As an embodiment, the micro three-way valve further comprises a magnet holder and an inner magnet fixed on the magnet holder. The magnet holder comprises a base plate and a side plate extending substantially perpendicularly from the base plate, the base plate is connected with the top plate of the base or the upper shell, and the inner magnet is fixed on the side plate; the plug holder is formed with a receiving groove for inserting the side plate and the inner magnet.

[0007] As an implementation form, a through hole is formed on the side plate, and a through hole is also formed on the part of the plug support for fixing the coil, so that the inner magnet and the coil are in spaced opposition.

[0008] As an implementation form, the micro three-way valve further comprises an inner magnet connected with the top plate of the upper shell or the base, a receiving groove is formed on the plug support for inserting the inner magnet, and the outer magnet, the coil and the inner magnet are oppositely arranged in the direction parallel to the top plate of the upper shell.

[0009] As an implementation form, the micro three-way valve further comprises a magnetic enhancement ring fixed on the side of the base facing the upper shell, and one end of the first gas outlet is inserted into the hole in the middle of the magnetic enhancement ring.

[0010] As an implementation form, the elastic support assembly comprises two lower springs, one end of each lower spring is connected with the plug support, and the other end is connected with the base.

[0011] As an implementation form, the micro three-way valve further comprises two conductive members fixed on the side of the base away from the upper shell or integrally formed in the base, each conductive member comprises a conductive terminal, a hole is formed on the base for the conductive terminal to extend out, the conductive terminal is electrically connected with the corresponding lower spring, and the lower spring is also electrically connected with the coil on the plug support.

[0012] As an implementation form, the micro three-way valve further comprises a magnetic enhancement ring fixed on the side of the base facing the upper shell, and one end of the first gas outlet is inserted into the hole in the middle of the magnetic enhancement ring; a plurality of through holes are further formed on the base, and the magnetic enhancement ring and the conductive member are in spaced opposition through the through holes on the base.

[0013] As an implementation form, the micro three-way valve further comprises an annular gasket fixed on the inner surface of the top plate of the upper shell, and the elastic support assembly comprises an upper spring, the upper spring is a leaf spring, the inner side end of the upper spring is connected with the plug support, and the outer side end of the upper spring is fixedly connected with the side of the gasket away from the top plate of the upper shell.

[0014] The micro three-way valve adopts a coil and a plug support as a mover and a magnet as a stator, a flexible plug is fixed on the plug support, the movement of the mover is controlled to make the flexible plug close the corresponding gas outlet to control the gas outlet from which gas outlet, the mass of the coil is small, the driving efficiency is improved, the coil is located in the magnetic field, the magnetic force utilization rate is high, the external magnetic field disturbance is not easy to be affected, and the stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a perspective view of the micro three-way valve of the first embodiment of the present application.

[0016] Figure 2 It is a perspective view of the micro three-way valve of the first embodiment of the present application.Figure 1 A-A sectional view of the micro three-way valve.

[0017] Figure 3 A-A sectional view of the micro three-way valve. Figure 1 A-A sectional view of the micro three-way valve.

[0018] Figure 4 Structure diagram of the base of the three-way valve of Example One.

[0019] Figure 5 Structure diagram of the rotor of the three-way valve of Example One.

[0020] Figure 6 Structure diagram of the upper spring and the lower spring of the three-way valve of Example One.

[0021] Figure 7 Perspective view of the micro three-way valve of Example Two.

[0022] Figure 8 A-A sectional view of the micro three-way valve. Figure 7 A-A sectional view of the micro three-way valve.

[0023] Figure 9 A-A sectional view of the micro three-way valve. Figure 7 A-A sectional view of the micro three-way valve.

[0024] Figure 10 Structure diagram of the base of the three-way valve of Example Two.

[0025] Figure 11 Structure diagram of the plug support of the three-way valve of Example Two.

[0026] Figure 12 Structure diagram of the upper shell of the three-way valve of Example Two. DETAILED DESCRIPTION

[0027] The micro three-way valve of the present application will be described in further detail below in conjunction with specific embodiments and the accompanying drawings.

[0028] Example One:

[0029] Please refer to Figures 1 to 3 In an embodiment, the micro three-way valve of the present application mainly comprises a base 10, an upper shell 20, a plurality of external magnets 30, a plug support 40, a coil 41, a flexible plug 42 and an elastic support assembly 50.

[0030] Please refer to Figure 4, the base 10 is generally square plate shape, the center of which is formed with hollow convex column extending towards both sides of the base as the first air outlet 11. The base is made of non-conductive material, such as plastic, preferably made of polymethyl methacrylate plastic, which is high in strength and light in weight. The side of the base 10 facing the upper shell 20 extends out a boss 12 near the periphery, which is symmetrically formed with a plurality of fixing columns 13 on the boss 12 for fixing the outer side end 522 of the lower spring 52 (see Figure 6 ). A through hole 14 is formed near the fixing column 13 for the conductive terminal 62 to pass through. Two through holes 15 are also formed between the boss 12 and the first air outlet 11, which are symmetrically located on both sides of the first air outlet 11.

[0031] The upper shell 20 includes a top plate 21 and a side wall 22 extending integrally from the periphery of the top plate 21. The end of the side wall 22 is fixedly connected with the base 10, so that the upper shell 20 and the base together form a hollow shell. In this embodiment, the top plate 21 is generally square plate shape, and the center of the top plate 21 is provided with a second air outlet 23. The side wall 22 is provided with an air inlet 24 near the base 10. In this embodiment, the upper shell 20 is made of metal material with magnetic conductivity, such as iron or 430 stainless steel, which can protect the internal structure as the shell and also serve as a magnetic conductor to prevent the internal magnetic field from overflowing and improve the utilization rate of the magnetic field. A through hole is formed in the center of the top plate 21, and a hollow tube connected with the hole forms the second air outlet 23. The second air outlet 23 is also made of metal material, such as 430 stainless steel, which is welded on the upper shell 20, with one end protruding from the inside of the upper shell 20 and the other end extending outward from the upper shell 20. The air inlet 24 is similar to the second air outlet 23, which is also a hollow tube welded on the periphery of the hole of the side wall 22 and made of metal material. The difference is that the first air outlet 11 and the second air outlet 23 are preferably protruding inside the shell defined by the upper shell 20 and the base 10, which facilitates the plugging of the air outlet from the inside, while the air inlet 24 does not need to protrude inside the upper shell 20.

[0032] In this embodiment, the first air outlet 11 and the second air outlet 23 are located on the same straight line. It can be understood that in other embodiments, the first air outlet 11 and the second air outlet 23 can be located on different straight lines parallel to each other.

[0033] A plurality of outer magnets 30 (four in this embodiment) as part of the stator are fixed inside the side wall 22 of the upper shell 20, such as but not limited to being bonded on the side wall 22 of the upper shell 20 by glue.

[0034] The plug holder 40, the coil 41 and the flexible plug 42 are arranged as the rotor on the inner circumferential side of the plurality of outer magnets 30. Please also refer to Figure 5The plug support 40 mainly comprises a fixing block 43 with a through hole 431 and a hollow frame 45 connected to the fixing block 43 by a plurality of connecting arms 44. In this embodiment, the fixing block 43 is a column with a regular shape (square in this embodiment) and the through hole 431 is formed in the central axis thereof. The flexible plug 42 is a long strip structure with plugs at both ends, the middle part of which is fixed in the through hole of the fixing block 43 and the two plugs protrude from both ends of the fixing block 43. One end of the connecting arm 44 extends substantially perpendicularly from the outer wall 432 of the fixing block 43 and the other end is connected to the inner wall of the frame 45. That is, the frame 45 is sleeved on the outer periphery of the fixing block 43 and the frame 45 and the fixing block 43 are open at positions corresponding to both ends, allowing the two ends of the plug to protrude or be exposed. Thus, in the direction parallel to the central axis of the through hole 431 of the fixing block 43, a plurality of accommodation grooves 46 are formed between the fixing block 43 and the frame 45 for insertion of external objects (internal magnets 80 in this embodiment). In this embodiment, the frame 45 is generally square and the fixing block 43 is connected to the four corners of the frame 45 by four connecting arms 44. In addition, the frame 45 is also formed with a plurality of through holes at positions opposite to the outer wall 432 of the fixing block 43, which are in communication with the accommodation grooves 46. This structure not only reduces the weight of the mover, but also facilitates the insertion of the internal magnets into the accommodation grooves 46 and the spaced opposition of the coils 41 to the internal magnets, thereby increasing the magnetic force of the magnetic field. The plug support 40 is made of a non-conductive material, preferably plastic.

[0035] The outer surface of the side wall of the frame 45 is formed with a wire groove 451 for winding or accommodating the coil 41. In this embodiment, the coil 41 is preferably a copper or silver conductive coil, which is wound around the central axis of the through hole 431 of the fixing block 43 on the outer wall of the frame 45. Thus, the wire groove 451 is an annular groove recessed from the surface of the side wall of the frame 45 or formed with bosses on both sides. When the winding direction of the coil is perpendicular to the direction of the central axis of the through hole 431 of the fixing block 43, the wire groove can be a square or elliptical groove or hole formed in the side wall of the frame 45. The plurality of through holes formed in the frame 45 at positions opposite to the outer wall 432 of the fixing block 43 are in communication with the accommodation grooves 46, which not only reduce the weight of the mover, but also allow the coil 41 to be spaced apart from the internal magnets 80 inserted into the accommodation grooves of the plug support 40, thereby increasing the driving efficiency.

[0036] The flexible plug 42 can be formed by injection molding of liquid silicone in the fixing block 43, which has the advantage of more stable structure. The end surface 433 of the fixing block 43 is also formed with a recess 434, one end of which is in communication with the through hole 431. When the liquid silicone is injection molded in the through hole 431, the recess 434 can facilitate the shaping and stabilization of the liquid silicone.

[0037] The mover is suspended in the housing composed of the base 10 and the upper shell 20 by the elastic support assembly 50. The elastic support assembly 50 allows the plug support 40 to move between the first air outlet 11 and the second air outlet 23, and makes the coil 41 and the outer magnet 30 face each other. In the embodiment, the elastic support assembly 50 includes an upper spring 51 and two lower springs 52. Please refer to Figure 6 The upper spring 51 is a plate spring, which includes an inner ring (inner end) 511 for fixed connection with the upper end of the plug support 40 (the end facing the top plate 21 of the upper shell 20), an outer ring (outer end) 512 for connection with the upper shell 20, and a plurality of elastic arms 513 extending between the inner ring 511 and the outer ring 512.

[0038] The upper end surface 453 of the frame 45 of the plug support 40 is formed with a protrusion 452 for limiting the upper limit of the movement of the plug support 40. When the plug support 40 moves to the farthest end in the direction of the second air outlet 23, the protrusion 452 contacts the upper shell 20. In addition, the protrusion 452 can also serve the purpose of limiting the position of the inner end 511 of the upper spring 51, which can be arranged inside the inner end 511, with its side wall abutting against the inner end 511, to guide the accurate positioning of the upper spring 51 during assembly.

[0039] The lower spring 52 is also a plate spring, which is preferably made of conductive metal and simultaneously serves as the conductive path of the coil 41. The two lower springs 52 do not contact each other, and each of the lower springs 52 includes an inner side 521 for fixed connection with the lower end of the plug support 40 (the end facing the base 10), two elastic arms 523 extending from both ends of the inner side 521, and an outer side 522 connected to the ends of the elastic arms 523. The outer side 522 is fixedly connected with the fixed column 13 on the boss 12 of the base 10, and is electrically connected with the conductive terminal 62 in the through hole 14 of the base 10. The inner side 521 is electrically connected with the end of the coil 41.

[0040] In the embodiment, the micro three-way valve further includes two conductive members 60, and the conductive terminals 62 are formed on the conductive members 60. Each of the conductive members 60 includes a metal sheet 61 substantially in the shape of a rectangle, and two conductive terminals 62 extending substantially perpendicularly from the edges of the metal sheet 61. The two conductive members 60 are fixed on the side of the base 10 facing away from the upper shell 20 without contacting each other, and the conductive terminals 62 are inserted into the through holes 14 and exposed outside the base 10. Each of the conductive members 60 is electrically connected with one of the lower springs 52. The structure of the conductive members 60 makes the fixation of the conductive terminals 62 more stable and has a longer service life, and can simultaneously serve as the magnetic conductive sheet, so that a complete magnetic conductive shell is formed outside the micro three-way valve, and the magnetic concentration effect is good.

[0041] In operation, when the coil 41 is energized, the plug holder 40 is driven to move between the first outlet 11 and the second outlet 23, so that the flexible plug 42 blocks one of the first outlet 11 and the second outlet 23, thereby controlling the micro valve to ventilate through the corresponding outlet. Since the mover has a small overall mass, the driving efficiency is improved. Since the coil 41 is located in the magnetic field generated by the outer magnet 30, the magnetic force utilization rate is high, and it is not easy to be disturbed by external magnetic field, and the stability is good.

[0042] In order to provide space for the deformation of the upper spring 51, the micro three-way valve further comprises an annular gasket 25 fixed to the inner surface of the top plate 21 of the upper shell 20, and the outer ring 512 of the upper spring 51 is fixed to the side of the annular gasket 25 away from the top plate 21. It can be understood that in other embodiments, a plurality of structures protruding towards the inside of the shell can be formed on the top plate 21 to replace the gasket 25.

[0043] In order to further increase the driving force, the micro three-way valve of the present application further comprises a magnet holder 70 and a plurality of (four in this embodiment) inner magnets 80 fixed to the magnet holder 70. The magnet holder 70 and the inner magnet 80 serve as part of the stator, which can be fixed to the upper shell 20 or the base 10, and in this embodiment, it is fixed to the upper shell.

[0044] The magnet holder 70 comprises a base plate 71 and a plurality of (four in this embodiment) side plates 72 extending substantially perpendicularly from the base plate 71. The base plate 71 is connected to the top plate 21 of the upper shell 20, and the base plate 71 has a hole 711 formed therein for avoiding the second outlet 23. The inner magnet 80 is fixed to the side plate 72. The magnet holder 70 is preferably made of a magnetically conductive material, such as iron. In order to increase the effect of the inner magnet 80, a through hole 721 is formed in the side plate 72, and the inner magnet 80 is fixed to the inner side of the hole 721. The side plate 72 with the inner magnet 80 inserted into the slot (receiving groove) 46 of the plug holder 40, and the inner magnet 80 is in spaced opposition with the coil 41.

[0045] The cooperation of the outer magnet 30 and the inner magnet 80 can provide sufficient driving force, improve the response speed of the micro three-way valve, and increase the service life of the product, even if it is used for a long time, there will be no air leakage.

[0046] In order to further increase the driving force, the micro three-way valve of the present application further comprises a magnet enhancement ring 90 fixed to the side of the base 10 facing the upper shell 20. The magnet enhancement ring 90 has a hole formed in the middle for avoiding the first outlet 11. The magnet enhancement ring 90 is preferably made of a hard magnetic material, such as ferroboron. The magnet enhancement ring 90 is in spaced opposition with the conductive part 60 through the through hole 15 in the base, and has better magnetic conduction effect. By controlling the direction and size of the current input to the coil 41, the magnetic field generated by the coil 41 and the magnetic field of the magnet enhancement ring 90 can be made to attract or repel each other, thereby generating a greater force on the mover part.

[0047] In the above embodiments, the micro three-way valve has a cuboid shape, and thus the base 10 has a square shape, and the outer magnet and the inner magnet each have four pieces. It can be understood that in other embodiments, the base can have a regular shape such as a circle or a triangle or a pentagon, and the micro three-way valve can have a cylindrical shape or a regular polygonal column shape, and the number of the outer magnet and the inner magnet can be adjusted as appropriate, as long as the required magnetic field can be provided.

[0048] In the above embodiments, the first gas outlet and the second gas outlet each protrude from the inside of the shell by a portion to facilitate plugging by the plug. It can be understood that the first gas outlet and the second gas outlet can also not protrude from the inside of the shell, as long as the plug can plug the corresponding gas outlet when the rotor moves to the preset position.

[0049] In the above embodiments, the base 10 is formed with a boss 12 and a through hole 15. It can be understood that in other embodiments, the boss can be omitted and only the fixing column 13 can be retained. The through hole can also be omitted, and when it is provided, the number thereof is not limited to two, and can be more.

[0050] In the above embodiments, the flexible plug 42 is integrally formed and extends from both ends of the fixing block 43 of the plug support 40. It can be understood that in other embodiments, two flexible plugs can be included and fixed at both ends of the through hole of the fixing block of the plug support.

[0051] In the above embodiments, the plug support 40 includes the fixing block 43, the connecting arm 44, and the frame 45. It can be understood that the shape of the plug support is not limited thereto, as long as the plug support 40 is formed with a receiving groove into which a part of the inner magnet and the magnet support is inserted, and is formed with a fixing block into which the flexible plug is fixed and a wire slot into which the coil is fixed.

[0052] In the above embodiments, the coil 41 is wound on the plug support. It can be understood that in other embodiments, a plurality of coils wound on axes perpendicular to the central axis of the fixing block 43 can be used to replace the coil 41, and appropriate magnets can be used to achieve the same driving effect.

[0053] In the above embodiments, the upper spring and the lower spring are used. It can be understood that in other embodiments, the upper spring can be omitted, and the inner side of the lower spring can be connected to the middle part of the plug support. The structure of the upper spring and the lower spring is not limited thereto, as long as the rotor can be elastically suspended and supported, and the rotor can move between the first gas outlet and the second gas outlet.

[0054] In other embodiments, the conductive member can be omitted, and as long as a conductive terminal electrically connected to the lower spring and connectable to an external circuit is provided.

[0055] In other embodiments, the magnet holder and the inner magnet can be omitted as needed.

[0056] In other embodiments, the magnet enhancement ring can be omitted as needed.

[0057] Embodiment Two

[0058] For reference Figures 7 to 12 The structure of the micro three-way valve of Embodiment Two is similar to that of Embodiment One. For the convenience of description, the reference numerals of the components of Embodiment Two that are basically the same as those of Embodiment One are the same as those of Embodiment One. The main difference between the structure of the micro three-way valve of Embodiment Two and that of Embodiment One is that: (1) the gas inlet 24' is formed on the base 10'; (2) the inner magnet 80 and the magnet holder 70 are replaced by an inner magnet 90' similar in structure to the magnet enhancement ring 90, and the structure of the corresponding plug holder 40' is changed; (3) the top plate 21' of the upper shell 20' is formed with a recessed platform 211 near the edge, which is recessed toward the base 10', thereby canceling the annular gasket 25.

[0059] The above differences are described in further detail as follows.

[0060] In this embodiment, the base 10' is generally square plate-shaped, and a hollow protruding column extending toward both sides of the base is formed at the center as the first gas outlet 11. A protruding platform 12' extending toward the upper shell 20 is formed near the periphery of the side of the base 10' facing the upper shell 20, and a plurality of fixing blocks 13' for fixing the outer side end of the lower spring 52 are symmetrically formed on the protruding platform 12'. A hollow protruding column extending toward the outer side is further formed on the protruding platform 12' as the gas inlet 24', and a recess 16 communicating with the gas inlet 24' is formed at the position of the base 10' near the gas inlet 24', i.e., the gas inlet channel is in the shape of L as a whole. The gas first passes through the gas inlet 24' which is substantially perpendicular to the first gas outlet 11, and then enters the micro three-way valve through the recess 16 in a direction substantially parallel to the first gas outlet 11. In this way, the gas inlet 24' and the base 10' share the internal space, and the actual space occupied is smaller than that of Embodiment One, so that the size of the outer magnet 30 can be designed to be larger, and the magnetic field strength provided can be stronger. In addition, the gas inlet 24' and the base 10', the first gas outlet 11 can be integrally formed, which simplifies the manufacturing and assembly process and is efficient. In this embodiment, the gas inlet 24' and the base 10', the first gas outlet 11 are made of non-conductive material, such as plastic, preferably integrally formed of polymethyl methacrylate plastic, which has high strength and light weight.

[0061] In addition, two conductive members (not shown in the figure, which can be metal buried wires) similar to the conductive member 60 in the first embodiment are embedded in the base 10'. The conductive members are provided with solder pads 14' at the four corners of the boss 12' of the base 10' for electrical connection with the lower spring 52, and conductive pins 62' extending from the bottom of the base 10' for electrical connection with external circuits.

[0062] A plurality of through holes 15' are formed between the boss 12' and the first gas outlet 11, and the through holes 15' are symmetrically located on the side of the first gas outlet 11. A metal sealing plate 60' made of a magnetically conductive material and having a through hole in the middle is fixed to the bottom of the base 10', so that the micro three-way valve forms a complete magnetically conductive shell outside, and the magnetic concentration effect is good.

[0063] The plug support 40', the coil 41 and the flexible plug 42' are arranged on the inner circumferential side of the plurality of outer magnets 30 as a rotor. The plug support 40' is made of a non-conductive material, preferably plastic. The plug support 40' mainly includes a fixing block 43' having a through hole 431' and a hollow frame 45'. In this embodiment, the fixing block 43' is generally square plate-shaped, two sides of which are connected to the inner side of the upper end of the frame 45', and the other two sides are not connected to the frame 45', forming an opening. That is, the frame 45' is sleeved on the outer circumference of the fixing block 43', and the positions corresponding to the two ends (two sides) of the frame 45' are open, allowing the plugs at both ends to protrude or be exposed. The space inside the frame 45' not occupied by the fixing block 43' is a receiving groove 46' for inserting the inner magnet 90'. The coil 41 is wound in the wire slot of the outer wall of the frame 45'.

[0064] The flexible plug 42' is dumbbell-shaped with plugs at both ends, and the waist is fixed in the through hole 431' of the fixing block 43', and the two plugs protrude from both ends of the fixing block 43'. Compared with the first embodiment, the fixing block 43' of the second embodiment is generally plate-shaped, so the height is smaller, and correspondingly, the length of the flexible plug 42' is shorter, and the height of the first gas outlet 11 protruding from the base 10' towards the upper shell 20 is higher, and the end of the flexible plug 42' is inserted into the frame 45' of the plug support 40' opposite to the first gas outlet 11, so that the rotor can seal one of the gas outlets without moving a long distance.

[0065] The flexible plug 42' can be formed by injection molding of liquid silicone in the fixing block 43', which has the advantage of more stable structure. The end surface 433' of the fixing block 43' further has a recess 434' which communicates with the through hole 431' at one end. When the liquid silicone is injection molded in the through hole 431', the recess 434' can facilitate the shaping and stabilization of the liquid silicone.

[0066] The upper end surface 453 of the frame 45' of the plug support 40' is formed with a protrusion 452 for limiting the upper limit of the movement of the plug support 40'. When the plug support 40' moves to the farthest end in the direction of the second gas outlet 23, the protrusion 452 is in contact with the upper shell 20. In addition, the protrusion 452 can also serve the purpose of limiting the inner side end 511 of the upper spring 51, which can be arranged inside the inner side end 511, and the side wall thereof is in abutment with the inner side end 511, which can guide the accurate positioning of the upper spring 51 during assembly.

[0067] The inner magnet 90' is generally square-shaped, with a hole formed in the middle to avoid the first gas outlet 11, and is fixed at one end to the base 10' and inserted into the receiving groove 46' inside the frame 45' at the other end. The outer magnet 30, the coil 41 and the inner magnet 90' are arranged opposite to each other in a direction parallel to the top plate of the upper shell 20'. The inner magnet 90' is preferably made of a hard magnetic material, such as ferritic boron. The inner magnet 90' is spaced apart from the sealing plate 60' through the through hole 15' in the base 10', and the magnetic guiding effect is better. By controlling the direction and size of the current input to the coil 41, the magnetic field generated by the coil 41 can be made to attract or repel the magnetic fields of the outer magnet 30 and the inner magnet 90', so that a greater force is generated on the rotor portion. Compared with the first embodiment, the second embodiment omits the inner magnet 80 and the magnet support 70, simplifying the structure and manufacturing and assembly process of the micro three-way valve.

[0068] In the description of the present application, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements 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.

[0069] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0070] Although the description of the present application is made in conjunction with the above specific embodiments, it is obvious to those skilled in the art that many substitutions, modifications and changes can be made based on the above description. Therefore, all such alternatives, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A micro three-way valve, characterized by The application relates to a magnetic speaker, which comprises: a base with a first air outlet formed thereon; an upper shell connected with the base to define a receiving space, which comprises a top plate and a side wall integrally extended from the periphery of the top plate, the top plate is provided with a second air outlet, and the first air outlet and the second air outlet are located on the same straight line or on parallel straight lines; an air inlet arranged on the side wall of the upper shell or the base; an outer magnet fixed in the inner side of the upper shell; a plug support arranged in the inner side of the outer magnet; a coil fixed on the plug support and spaced apart from the outer magnet; a flexible plug fixed on the plug support; an elastic supporting assembly connected between the plug support and the base or the upper shell; a magnet support comprising a base plate and a side plate substantially vertically extended from the base plate, the base plate is connected with the base or the top plate of the upper shell; an inner magnet fixed on the magnet support and fixed on the side plate; wherein the elastic supporting assembly allows the plug support to move between the first air outlet and the second air outlet; when the coil is powered, the plug support can be driven to move between the first air outlet and the second air outlet, so that the flexible plug blocks one of the first air outlet and the second air outlet; the plug support is formed with a receiving groove for inserting the side plate and the inner magnet. The plug support comprises:

2. The micro three-way valve according to claim 1, characterized by a fixing block formed with a through hole, the flexible plug is fixed in the through hole and protrudes from both ends of the fixing block; and a hollow frame arranged on the outer periphery of the fixing block and connected with the fixing block; wherein the coil is fixed on the outer surface of the side wall of the frame; in the direction parallel to the central axis of the through hole of the fixing block, the receiving groove is formed between the fixing block and the frame. The side plate is formed with a through hole, and the part of the plug support for fixing the coil is also formed with a through hole, so that the inner magnet is spaced apart from the coil.

3. The micro three-way valve according to claim 1, wherein The application further comprises a magnet enhancement ring fixed on the side of the base facing the upper shell, and one end of the first air outlet is inserted into the hole in the middle of the magnet enhancement ring.

4. The micro three-way valve according to claim 1, wherein The elastic supporting assembly comprises two lower springs, one end of each lower spring is connected with the plug support, and the other end is connected with the base.

5. The micro three-way valve according to claim 1, wherein The application further comprises two conductive parts fixed on the side of the base away from the upper shell or integrally formed in the base, each conductive part comprises a conductive terminal, the base is formed with a hole for the conductive terminal to protrude, the conductive terminal is electrically connected with the corresponding lower spring, and the lower spring is also electrically connected with the coil on the plug support.

6. The micro three-way valve according to claim 5, wherein The application further comprises a magnet enhancement ring fixed on the side of the base facing the upper shell, and one end of the first air outlet is inserted into the hole in the middle of the magnet enhancement ring; the base is further formed with a plurality of through holes, and the magnet enhancement ring and the conductive part are spaced apart through the through holes in the base.

7. The micro three-way valve according to claim 6, characterized in that The application further comprises a ring-shaped gasket fixed on the inner surface of the top plate of the upper shell, and the elastic supporting assembly comprises an upper spring, which is a leaf spring, the inner side end of the upper spring is connected with the plug support, and the outer side end is fixedly connected with the side of the gasket away from the top plate of the upper shell.

8. The micro three-way valve according to claim 1, wherein The application relates to a magnetic speaker, which comprises:

9. A micro three-way valve characterized by a base with a first air outlet formed thereon; ​ An upper shell connected with the base to define a receiving space, which comprises a top plate and a side wall integrally extended from the periphery of the top plate, a second air outlet is arranged on the top plate, the first air outlet and the second air outlet are located on the same straight line or on parallel straight lines; An air inlet arranged on the side wall of the upper shell or the base; An outer magnet fixed inside the upper shell; A plug holder arranged inside the outer magnet; A coil fixed on the plug holder, which is in spaced opposition with the outer magnet; A flexible plug fixed on the plug holder; An elastic support assembly connected between the plug holder and the base or the upper shell; And An inner magnet connected with the base or the top plate of the upper shell; Wherein, the elastic support assembly allows the plug holder to move between the first air outlet and the second air outlet; when the coil is powered, the plug holder can be driven to move between the first air outlet and the second air outlet, so that the flexible plug blocks one of the first air outlet and the second air outlet; The plug holder is formed with a receiving groove for the inner magnet to be inserted; the outer magnet, the coil and the inner magnet are oppositely arranged in the direction parallel to the top plate of the upper shell.

10. The micro three-way valve according to claim 9, characterized in that The plug holder comprises: A fixing block formed with a through hole, the flexible plug is fixed in the through hole and protrudes from both ends of the fixing block; and A hollow frame arranged on the periphery of the fixing block and connected with the fixing block; Wherein, the coil is fixed on the outer surface of the side wall of the frame; the receiving groove is formed in the space of the frame which is not occupied by the fixing block in the direction parallel to the central axis of the through hole of the fixing block.

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