A super magnetostrictive solenoid valve

Abstract

The present invention relates to the field of electromagnetic valve technology, and specifically discloses a giant magnetostrictive electromagnetic valve. The present invention provides a giant magnetostrictive electromagnetic valve, which includes a control piston, an iron core, a coil, a giant magnetostrictive rod, an adjusting member and a transmission member. The coil is wound around the iron core, and the iron core has an installation cavity. The giant magnetostrictive rod is arranged in the installation cavity, and the telescopic direction of the giant magnetostrictive rod is in the same direction as the center line direction of the installation cavity. The adjusting member is screwed to the inner wall of the installation cavity, and the two ends of the giant magnetostrictive rod are respectively in contact with the adjusting member and the transmission member; the control piston has an oil cavity and a first oil hole connected to the oil cavity, and the giant magnetostrictive rod is used to drive the transmission member to move so that the transmission member opens or closes the first oil hole. When assembling and debugging the giant magnetostrictive electromagnetic valve, the position of the giant magnetostrictive rod in the installation cavity can be adjusted by screwing the adjusting member, and then the movable range of the transmission member can be adjusted to achieve the adjustment of the opening of the first oil hole.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a giant magnetostrictive solenoid valve. Background Art

[0002] As emission regulations become increasingly stringent, higher requirements are placed on the emission performance of diesel engines in order to meet the requirements of increasingly stringent emission regulations. The injection performance of diesel engine electronic fuel injectors directly affects the emission performance of diesel engines. Therefore, in order to improve the injection performance of diesel engine electronic fuel injectors, higher injection pressure and faster drive response are usually used to achieve better injection characteristics of electronic fuel injectors.

[0003] As the main driving mode of electronic fuel injectors, the performance of high-speed solenoid valves directly determines the injection performance of electronic fuel injectors. The existing high-speed solenoid valve drivers are usually made of electromagnets or piezoelectric crystal materials, which have a slow response. In order to improve their rapid response, more ampere-turns and higher driving voltages are required, which makes the coils heat up seriously, the structure is complex, the volume is large, and the power consumption is large, which limits the further improvement of their frequency response. The giant magnetostrictive material (Terfemol-D) is a new type of functional material. Under magnetic field excitation, it can produce strain output that is several orders of magnitude larger than traditional magnetostrictive materials (such as nickel, iron, etc.). Due to its large magnetostrictive strain, extremely high energy storage density, fast response, low driving voltage, high Curie temperature, suitable for high temperature environment, and high pressure resistance, it is an ideal material for making high-speed solenoid valve drivers.

[0004] In the existing giant magnetostrictive solenoid valve, such as the giant magnetostrictive driver and the high-speed solenoid valve driven by the giant magnetostrictive driver disclosed in the previous patent with application number CN201010297422.1, one end of the magnetostrictive rod of the giant magnetostrictive driver is limited by the thermal compensation tube, and the other end is in contact with the magnetic output rod, the magnetic output rod is in contact with the right end of the valve core, and the left end of the valve core is in contact with the reset spring. When the coil is energized, the magnetostrictive rod pushes the valve core to move through the magnetic output rod to achieve the switching of the working position of the solenoid valve. However, the positions of the magnetostrictive rod and the thermal compensation tube are relatively fixed, and the adjustability is poor. Summary of the invention

[0005] The object of the present invention is to provide a giant magnetostrictive solenoid valve to solve the problem of poor adjustability of the magnetostrictive rod in the existing giant magnetostrictive solenoid valve.

[0006] The present invention provides a giant magnetostrictive solenoid valve, which comprises a control piston and a giant magnetostrictive driver arranged at one end of the control piston, wherein the giant magnetostrictive driver comprises an iron core, a coil, a giant magnetostrictive rod and a transmission member, wherein the coil is wound around the iron core, the iron core has an installation cavity, the giant magnetostrictive rod is arranged in the installation cavity, and the telescopic direction of the giant magnetostrictive rod is in the same direction as the center line direction of the installation cavity, the giant magnetostrictive solenoid valve further comprises an adjusting member, the adjusting member is screwed to the inner wall of the installation cavity, two ends of the giant magnetostrictive rod are respectively in contact with the adjusting member and the transmission member, the control piston has an oil cavity and a first oil hole connected to the oil cavity, and the giant magnetostrictive rod is used to drive the transmission member to move so that the transmission member opens or closes the first oil hole.

[0007] As an optimal technical solution for the giant magnetostrictive solenoid valve, the adjusting member includes a screw and a nut, the screw is threadedly connected to the inner wall of the installation cavity, the nut is located outside the installation cavity, and the outer diameter of the nut is larger than the outer diameter of the screw.

[0008] As a preferred technical solution of the giant magnetostrictive solenoid valve, the transmission member is provided with a second oil hole, and the second oil hole is used to connect to the oil tank;

[0009] The transmission member is slidably connected to the control piston. The transmission member can slide relative to the control piston and has an open position and a closed position. When the transmission member is located at the open position, the first oil hole is connected to the second oil hole. When the transmission member is located at the closed position, the first oil hole and the second oil hole are staggered, and the transmission member closes the first oil hole.

[0010] The giant magnetostrictive rod can drive the transmission member to move from the closed position to the open position.

[0011] As a preferred technical solution of the giant magnetostrictive solenoid valve, the giant magnetostrictive driver further includes an elastic member, and the elastic member is used to drive the transmission member to move from the closed position to the open position.

[0012] As a preferred technical solution of the giant magnetostrictive solenoid valve, the transmission member is provided with a slide groove, one end of the control piston is slidably located in the slide groove, and the second oil hole is arranged on the side wall of the slide groove and communicated with the slide groove.

[0013] As a preferred technical solution of the giant magnetostrictive solenoid valve, the extension directions of the second oil hole and the first oil hole are both perpendicular to the extension and contraction direction of the giant magnetostrictive rod.

[0014] As a preferred technical solution of the giant magnetostrictive solenoid valve, the transmission member is partially located in the installation cavity, and the transmission member is slidably matched with the iron core.

[0015] As a preferred technical solution of the giant magnetostrictive solenoid valve, the giant magnetostrictive driver also includes a support member, the support member has a accommodating cavity, the iron core is located in the accommodating cavity, the support member is also provided with a through hole communicating with the accommodating cavity, the transmission member is passed through the through hole, and the transmission member is slidably connected to the support member.

[0016] As an optimal technical solution for the giant magnetostrictive solenoid valve, a limit plate is further provided on the outer peripheral surface of the transmission member, and the limit plate is located in the accommodating cavity. The diameter of the limit plate is larger than the diameter of the through hole and larger than the diameter of the installation cavity, and the two ends of the elastic member are respectively abutted against the limit plate and the support member.

[0017] As a preferred technical solution of the giant magnetostrictive solenoid valve, the elastic member is a disc spring, and the disc spring is sleeved on the transmission member.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a giant magnetostrictive solenoid valve, wherein a giant magnetostrictive rod of the giant magnetostrictive solenoid valve is arranged in an installation cavity of an iron core, and the expansion and contraction direction of the giant magnetostrictive rod is in the same direction as the center line direction of the installation cavity, an adjusting member is screwed to the inner wall of the installation cavity, and two ends of the giant magnetostrictive rod are respectively in contact with the adjusting member and a transmission member; the giant magnetostrictive rod is used to drive the transmission member to move so that the transmission member opens or closes the first oil hole of the control piston. During assembly and debugging, the position of the giant magnetostrictive rod in the installation cavity can be adjusted by screwing the adjusting member, and then the movable range of the transmission member can be adjusted to achieve the adjustment of the opening of the first oil hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a giant magnetostrictive solenoid valve in an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the partial structure of the giant magnetostrictive solenoid valve in the embodiment of the present invention Figure 1 ;

[0022] Figure 3 Schematic diagram of the partial structure of the giant magnetostrictive solenoid valve in the embodiment of the present invention Figure 2 .

[0023] In the figure:

[0024] 1. Control piston; 11. Oil chamber; 12. First oil hole;

[0025] 2. Iron core; 21. Mounting cavity;

[0026] 3. Coil;

[0027] 4. Giant magnetostrictive rod;

[0028] 5. Adjustment member; 51. Screw rod; 52. Nut;

[0029] 6. Transmission member; 61. Second oil hole; 62. Slideway; 63. Limiting plate;

[0030] 7. Elastic parts;

[0031] 8. Support member; 81. Accommodating cavity; 82. Through hole. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the existing giant magnetostrictive solenoid valve, the non-driving end of the magnetostrictive rod is fixed, resulting in poor adjustability and inability to compensate for machining tolerances and installation tolerances.

[0037] In view of this, this embodiment provides a giant magnetostrictive solenoid valve to solve the above problem. The giant magnetostrictive solenoid valve can be applied to the electronically controlled fuel injector of a diesel engine.

[0038] Specifically, Figures 1 to 3 As shown, the giant magnetostrictive solenoid valve comprises a control piston 1 and a giant magnetostrictive driver arranged at one end of the control piston 1, and the giant magnetostrictive driver comprises an iron core 2, a coil 3, a giant magnetostrictive rod 4, an adjusting member 5 and a transmission member 6. The coil 3 is wound around the iron core 2, the iron core 2 has an installation cavity 21, the giant magnetostrictive rod 4 is arranged in the installation cavity 21, and the expansion and contraction direction of the giant magnetostrictive rod 4 is in the same direction as the center line direction of the installation cavity 21, the adjusting member 5 is screwed to the inner wall of the installation cavity 21, and the two ends of the giant magnetostrictive rod 4 are respectively in contact with the adjusting member 5 and the transmission member 6; the control piston 1 has an oil cavity 11 and a first oil hole 12 connected to the oil cavity 11, and the giant magnetostrictive rod 4 is used to drive the transmission member 6 to move, so that the transmission member 6 opens or closes the first oil hole 12. During assembly and debugging of the giant magnetostrictive solenoid valve, the position of the giant magnetostrictive rod 4 in the installation cavity 21 can be adjusted by screwing the adjusting member 5, thereby adjusting the range of motion of the transmission member 6 and adjusting the opening of the first oil hole 12.

[0039] In this embodiment, the transmission member 6 is provided with a second oil hole 61, and the second oil hole 61 is used to communicate with the oil tank; the transmission member 6 is slidably connected to the control piston 1, and the transmission member 6 can slide relative to the control piston 1 and has an open position and a closed position. When the transmission member 6 is in the open position, Figure 2 As shown, the first oil hole 12 is connected to the second oil hole 61, and the oil in the oil chamber 11 of the control piston 1 can be discharged through the first oil hole 12 and the second oil hole 61; when the transmission member 6 is in the closed position, as shown in FIG. Figure 3 As shown, the first oil hole 12 and the second oil hole 61 are staggered, and the transmission member 6 closes the first oil hole 12 , and the oil is sealed in the oil chamber 11 .

[0040] The giant magnetostrictive rod 4 can drive the transmission member 6 to move from the closed position to the open position. In this embodiment, the giant magnetostrictive driver further includes an elastic member 7, which is used to drive the transmission member 6 to move from the open position to the closed position.

[0041] Optionally, the extension direction of the second oil hole 61 and the first oil hole 12 are perpendicular to the extension direction of the giant magnetostrictive rod 4. In this way, during the opening and closing process of the first oil hole 12, the transmission member 6 does not bear the axial force, so that the elastic member can drive the transmission member 6 back to the closed position with a small force, which can reduce the cost to a certain extent and improve the rapid response capability of the giant magnetostrictive solenoid valve.

[0042] Optionally, the transmission member 6 is provided with a slide groove 62, one end of the control piston 1 slides in the slide groove 62, and the second oil hole 61 is provided on the side wall of the slide groove 62 and communicates with the slide groove 62. The slide groove 62 can ensure that the sliding direction of the transmission member 6 relative to the control piston 1 is stable.

[0043] Optionally, the transmission member 6 is partially located in the installation cavity 21, and the transmission member 6 is slidably matched with the iron core 2. Such an arrangement can ensure that the sliding direction of the transmission member 6 relative to the iron core 2 is stable, thereby ensuring that its position during the activity is relatively accurate.

[0044] Optionally, the giant magnetostrictive actuator further includes a support member 8, the support member 8 has a housing cavity 81, the core 2 is located in the housing cavity 81, the support member 8 is further provided with a through hole 82 communicating with the housing cavity 81, the transmission member 6 is passed through the through hole 82, and the transmission member 6 is slidably connected to the support member 8. By making the transmission member 6 slide relative to the support member 8, the stability of the sliding direction of the transmission member 6 can be further ensured.

[0045] In this embodiment, a limit plate 63 is further provided on the outer circumference of the transmission member 6. The limit plate 63 is located in the accommodating cavity 81. The diameter of the limit plate 63 is larger than the diameter of the through hole 82 and larger than the diameter of the installation cavity 21. The two ends of the elastic member abut against the limit plate 63 and the support member 8 respectively. Among them, the limit plate 63 can also limit the range of motion of the transmission member 6 by abutting against the iron core 2 and the support member 8. Preferably, the elastic member is a disc spring, which is sleeved on the transmission member 6, so that the deformation direction of the elastic member can be ensured to be stable. Further preferably, the transmission member 6 and the limit plate 63 are integrally formed.

[0046] Specifically, the working principle of the giant magnetostrictive actuator is as follows:

[0047] like Figure 2As shown, when the coil 3 is energized, the iron core 2 generates a magnetic field, the giant magnetostrictive rod 4 extends under the action of the magnetic field, and pushes the transmission member 6 to move from the closed position to the open position. When the transmission member 6 moves to the open position, the first oil hole 12 and the second oil hole 61 are connected, and the oil in the oil chamber 11 flows into the oil tank through the first oil hole 12 and the second oil hole 61.

[0048] like Figure 3 As shown, when the coil 3 is powered off, the magnetic field of the iron core 2 disappears, the giant magnetostrictive rod 4 retracts, and at the same time, under the action of the disc spring, the transmission member 6 moves from the open position to the closed position. When the transmission member 6 is in the closed position, the first oil hole 12 and the second oil hole 61 are misaligned, and the side wall of the slide groove 62 closes the first oil hole 12.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A giant magnetostrictive solenoid valve, comprising a control piston (1) and a giant magnetostrictive driver arranged at one end of the control piston (1), the giant magnetostrictive driver comprising an iron core (2), a coil (3), a giant magnetostrictive rod (4) and a transmission member (6), the coil (3) being wound around the iron core (2), the iron core (2) having an installation cavity (21), the giant magnetostrictive rod (4) being arranged in the installation cavity (21), and the expansion and contraction direction of the giant magnetostrictive rod (4) being in the same direction as the center line direction of the installation cavity (21), It is characterized in that The giant magnetostrictive solenoid valve further comprises an adjusting member (5), the adjusting member (5) being screwed to the inner wall of the mounting cavity (21), the two ends of the giant magnetostrictive rod (4) respectively abutting against the adjusting member (5) and the transmission member (6), the control piston (1) having an oil chamber (11) and a first oil hole (12) communicating with the oil chamber (11), the giant magnetostrictive rod (4) being used to drive the transmission member (6) to move, so that the transmission member (6) opens or closes the first oil hole (12); The adjusting member (5) comprises a screw rod (51) and a nut (52), wherein the screw rod (51) is screwed to the inner wall of the installation cavity (21), the nut (52) is located outside the installation cavity (21), and the outer diameter of the nut (52) is greater than the outer diameter of the screw rod (51); The transmission member (6) is provided with a second oil hole (61), and the second oil hole (61) is used to communicate with the oil tank; The transmission member (6) is slidably connected to the control piston (1); the transmission member (6) can slide relative to the control piston (1) and has an open position and a closed position; when the transmission member (6) is located at the open position, the first oil hole (12) is connected to the second oil hole (61); when the transmission member (6) is located at the closed position, the first oil hole (12) and the second oil hole (61) are staggered, and the transmission member (6) closes the first oil hole (12); The giant magnetostrictive rod (4) is capable of driving the transmission member (6) to move from the closed position to the open position; When assembling and debugging the giant magnetostrictive solenoid valve, the position of the giant magnetostrictive rod (4) in the installation cavity (21) is adjusted by screwing the adjusting member (5), thereby adjusting the range of motion of the transmission member (6) and achieving adjustment of the opening of the first oil hole (12).

2. The giant magnetostrictive solenoid valve according to claim 1, It is characterized in that The giant magnetostrictive actuator further comprises an elastic member, wherein the elastic member is used to drive the transmission member (6) to move from the closed position to the open position.

3. The giant magnetostrictive solenoid valve according to claim 2, It is characterized in that The transmission member (6) is provided with a slide groove (62), one end of the control piston (1) is slidably located in the slide groove (62), and the second oil hole (61) is provided on a side wall of the slide groove (62) and is in communication with the slide groove (62).

4. The giant magnetostrictive solenoid valve according to claim 3, It is characterized in that The extension directions of the second oil hole (61) and the first oil hole (12) are both perpendicular to the extension and contraction direction of the giant magnetostrictive rod (4).

5. The giant magnetostrictive solenoid valve according to claim 2, It is characterized in that The transmission member (6) is partially located in the installation cavity (21), and the transmission member (6) is in sliding cooperation with the iron core (2).

6. The giant magnetostrictive solenoid valve according to claim 5, It is characterized in that The giant magnetostrictive actuator further comprises a support member (8), the support member (8) having a housing cavity (81), the iron core (2) being located in the housing cavity (81), the support member (8) further being provided with a through hole (82) communicating with the housing cavity (81), the transmission member (6) being passed through the through hole (82), and the transmission member (6) being slidably connected to the support member (8).

7. The giant magnetostrictive solenoid valve according to claim 6, It is characterized in that A limit plate (63) is also provided on the outer circumferential surface of the transmission member (6), the limit plate (63) being located in the accommodating cavity (81), the diameter of the limit plate (63) being larger than the diameter of the through hole (82) and larger than the diameter of the mounting cavity (21), and the two ends of the elastic member respectively abut against the limit plate (63) and the support member (8).

8. The giant magnetostrictive solenoid valve according to claim 6, It is characterized in that The elastic member is a disc spring, and the disc spring is sleeved on the transmission member (6).

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