Normally closed pilot electromagnetic valve

Abstract

The invention relates to the technical field of vehicle body damping, in particular to a normally-closed pilot electromagnetic valve. The normally-closed pilot electromagnetic valve comprises an electromagnetic part and a pilot part, a main valve part comprises a pilot structure, a main valve element, a main valve sleeve and a main valve end cover, the main valve sleeve is provided with a first opening and a throttling hole, the main valve end cover is provided with a second opening, and the electromagnetic part can drive the main valve element to block the first opening and the second opening. The pilot structure is arranged on the main valve element, a first passage and a second passage are formed between the pilot structure and the main valve element and between the pilot structure and the main valve sleeve, the first passage and the second passage can communicate the throttling hole and the second opening correspondingly, and when a high-pressure medium flows to the second opening from the first opening and the throttling hole, the first passage works, the second passage is blocked, and the throttling hole is blocked. And when the high-pressure medium flows into the first opening and the throttling hole from the second opening, the second channel works, the first channel is blocked, and the second channel is configured to increase the opening pressure of the main valve element.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle body vibration reduction, in particular to a normally closed pilot solenoid valve. Background Art

[0002] At present, the vibration attenuation of vehicles is mainly achieved through the vehicle suspension system. The vehicle suspension system is divided into passive suspension, semi-active suspension and active suspension. Semi-active suspension has become the first choice of vehicle suspension system due to its advantages such as better balance of driving smoothness and handling stability, simple structure and relatively low price. The core component of the semi-active suspension is the damping adjustable shock absorber, and the normally closed pilot solenoid valve is the most core damping element in the damping adjustable shock absorber.

[0003] In the related art, with the continuous development of vehicle technology, the power system of the vehicle is gradually developing towards high power and high horsepower, which increases the pressure of the high-pressure oil in the vehicle suspension system. The maximum closing pressure that the existing normally closed pilot solenoid valve can withstand is less than the pressure applied by the actual high-pressure oil, and the existing normally closed pilot solenoid valve cannot adapt to the high-pressure oil in the vehicle suspension system.

[0004] Therefore, it is urgent to invent a normally closed pilot solenoid valve to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a normally closed pilot solenoid valve, so as to increase the maximum closing pressure that the normally closed pilot solenoid valve can withstand under the premise of the same solenoid valve output power, meet actual needs, and expand the scope of use.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Normally closed pilot solenoid valve, including:

[0008] Electromagnetic parts; and

[0009] A main valve part, the main valve part comprises a pilot structure, a main valve core, a main valve sleeve and a main valve end cover, the main valve sleeve is provided with a first opening and a throttle hole, the main valve end cover is provided with a second opening, and the electromagnetic part can drive the main valve core to block the first opening and the second opening;

[0010] The pilot structure is arranged on the main valve core, and a first passage and a second passage are formed between the pilot structure, the main valve core and the main valve sleeve, and the first passage and the second passage can respectively conduct the throttling hole and the second opening;

[0011] When the high-pressure medium flows from the first opening and the throttle hole to the second opening, the first passage works and the second passage is blocked, and the first passage is configured to increase the opening pressure of the main valve core;

[0012] When the high-pressure medium flows from the second opening into the first opening and the throttle hole, the second passage operates, the first passage is blocked, and the second passage is configured to increase the opening pressure of the main valve core.

[0013] As an optional solution, the pilot structure includes:

[0014] Pilot valve core;

[0015] A pilot valve seat is fixed on the main valve core, the pilot valve core is connected to the electromagnetic part, and the electromagnetic part can drive the pilot valve core to abut against the pilot valve seat, so that the main valve core blocks the first opening and the second opening;

[0016] A guide rod, disposed on the main valve core; and

[0017] A one-way conducting member is arranged between the guide rod and the pilot valve seat, the pilot valve seat is provided with a first docking hole, a second docking hole and a third docking hole which are in conduction with each other, the guide rod is provided with a flow guide hole, the main valve core is provided with a fourth docking hole, a fifth docking hole and a storage chamber, the flow guide hole and the fifth docking hole are respectively in conduction with the second opening;

[0018] The fourth docking hole, the first docking hole, the second docking hole, the storage cavity and the fifth docking hole constitute the first passage, the pilot valve core is connected to the electromagnetic part, and the electromagnetic part can drive the pilot valve core to block the second docking hole and drive the main valve core to block the first opening and the second opening;

[0019] The guide hole, the third docking hole, the first docking hole and the fourth docking hole constitute the second passage, and the one-way conducting member has a one-way conducting function for allowing the high-pressure medium to flow from the guide hole into the third docking hole.

[0020] As an optional solution, the one-way conductive member includes a lap joint and a deformation portion connected in sequence, the lap joint is arranged around the outer periphery of the deformation portion, the lap joint and the deformation portion are respectively overlapped on the end surface of the third docking hole away from the guide hole, the deformation portion blocks the third docking hole, and the deformation portion can be deformed along the axial direction of the third docking hole in a direction away from the guide hole so that the high-pressure medium flows from the guide hole into the third docking hole.

[0021] As an optional solution, the one-way conductive member includes:

[0022] A blocking ball, wherein the flow guide hole comprises a first flow guide portion and a second flow guide portion which are connected in sequence, the second flow guide portion is located at an end of the first flow guide portion away from the third docking hole, the aperture of the second flow guide portion is smaller than the aperture of the blocking ball, the blocking ball slides along the axial direction of the first flow guide portion, and the blocking ball is configured to block the second flow guide portion; and

[0023] A first elastic member, wherein the first elastic member is disposed between the blocking ball and the pilot valve seat, and two ends of the first elastic member are respectively in contact with the blocking ball and the pilot valve seat.

[0024] As an optional solution, the main valve core is provided with a plurality of the fourth docking holes at intervals along the circumferential direction, and each of the fourth docking holes is communicated with one of the first docking holes.

[0025] As an optional solution, the main valve core is provided with a plurality of the fifth docking holes at intervals along the circumferential direction, and each of the fifth docking holes is communicated with the second opening and the storage cavity at the same time.

[0026] As an optional solution, the electromagnetic part includes:

[0027] armature;

[0028] A tailpiece, one end surface of which is provided with a receiving hole extending in the axial direction, and the armature is movably mounted in the receiving hole;

[0029] A front bell, fixed to the rear bell, the front bell being configured to block the receiving hole, the front bell being connected to the main valve portion;

[0030] A push rod, the push rod passes through the front valve, one end of the push rod is connected to the armature, and the push rod can drive the main valve core to block the first opening and the second opening; and

[0031] The coil assembly is arranged on the outer periphery of the tailpiece, and the coil assembly is configured to drive the armature to move in the receiving hole.

[0032] As an optional solution, the electromagnetic part also includes:

[0033] The second elastic member is arranged in the accommodating hole, and two ends of the second elastic member are respectively in contact with the armature and a hole wall of the accommodating hole away from the front ear.

[0034] As an optional solution, the electromagnetic part also includes:

[0035] The third elastic member is arranged in the accommodating hole, and two ends of the third elastic member are respectively in contact with the armature and the front armature.

[0036] As an optional solution, the electromagnetic part also includes:

[0037] The magnetic isolation ring is arranged between the front ring and the rear ring.

[0038] Beneficial effects of the present invention:

[0039] The normally closed pilot solenoid valve provided by the present invention meets the blocking requirements of the first opening and the second opening by arranging a first opening and a throttle hole on the main valve sleeve and a second opening on the main valve end cover, and driving the main valve core to block the first opening and the second opening by the electromagnetic part. The pilot structure is arranged on the main valve core, so that the first passage and the second passage are formed between the pilot structure, the main valve core and the main valve sleeve, and it is ensured that the first passage and the second passage can both conduct the throttle hole and the second opening. When the high-pressure medium flows from the first opening and the throttle hole to the second opening, the first passage is operated and the second passage is blocked, and the effect of increasing the opening pressure of the main valve core is achieved by the first passage. When the high-pressure medium flows from the second opening into the first opening and the throttle hole, the second passage is operated and the first passage is blocked, and the effect of increasing the opening pressure of the main valve core is achieved by the second passage. Regardless of the flow direction of the high-pressure medium, the opening pressure of the main valve core can be increased without changing the output power of the electromagnetic part, that is, the maximum closing pressure that the normally closed pilot solenoid valve can withstand is increased, so as to be suitable for high-pressure media with greater pressure, meet actual needs, and improve the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 1 is a schematic diagram of the structure of a normally closed pilot solenoid valve provided in Embodiment 1 of the present invention;

[0041] Figure 2 is a cross-sectional schematic diagram of a normally closed pilot solenoid valve provided in Embodiment 1 of the present invention;

[0042] Figure 3 Schematic diagram of the path of the first passage in the normally closed pilot solenoid valve provided in the first embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the path of the second passage in the normally closed pilot solenoid valve provided in the first embodiment of the present invention;

[0044] Figure 5 is a cross-sectional schematic diagram of a main valve core and a pilot structure provided in Embodiment 1 of the present invention;

[0045] Figure 6 is a cross-sectional schematic diagram of a pilot valve seat provided in Embodiment 1 of the present invention;

[0046] Figure 7 is a schematic structural diagram of a one-way conductive member provided in Embodiment 1 of the present invention;

[0047] Figure 8 It is a cross-sectional schematic diagram of a one-way conducting member, a part of a pilot valve seat and a part of a guide rod provided in the first embodiment of the present invention;

[0048] Fig. 9 is a cross-sectional schematic diagram of a main valve seat provided in Embodiment 1 of the present invention;

[0049] Fig.10 is a cross-sectional schematic diagram of a normally closed pilot solenoid valve provided in Embodiment 2 of the present invention;

[0050] Fig.11 is a cross-sectional schematic diagram of a main valve core and a pilot structure provided in Embodiment 2 of the present invention;

[0051] Fig.12 It is a cross-sectional schematic diagram of a pilot valve seat, a guide rod and a one-way conducting member provided in the second embodiment of the present invention.

[0052] In the figure:

[0053] 1. First opening; 2. Second opening; 3. Throttle hole;

[0054] 100, main valve part; 110, pilot structure; 111, pilot valve core; 112, pilot valve seat; 1121, first docking hole; 1122, second docking hole; 1123, third docking hole; 113, guide rod; 1131, flow guide hole; 11311, first flow guide part; 11312, second flow guide part; 114, one-way guide member; 1141, overlap part; 1142, deformation part; 1143, blocking ball; 1144, first elastic member; 120, main valve core; 121, fourth docking hole; 122, fifth docking hole; 123, storage chamber; 130, main valve sleeve; 140, main valve end cover;

[0055] 200, electromagnetic part; 210, armature; 220, tail socket; 221, receiving hole; 230, front socket; 240, coil assembly; 250, second elastic member; 260, push rod; 270, third elastic member; 280, magnetic isolation ring. DETAILED DESCRIPTION

[0056] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0060] Embodiment 1

[0061] The core component of the semi-active suspension of the vehicle suspension system is the damping adjustable shock absorber, and the normally closed pilot solenoid valve is the core damping element in the damping adjustable shock absorber. In the relevant technology, with the continuous development of vehicle technology, the power system of the vehicle is gradually developing in the direction of high power and high horsepower, which increases the pressure of the high-pressure oil in the vehicle suspension system. The maximum closing pressure that the existing normally closed pilot solenoid valve can withstand is less than the pressure applied by the actual high-pressure oil, and the existing normally closed pilot solenoid valve cannot adapt to the high-pressure oil in the vehicle suspension system.

[0062] In order to solve the above problems, Figure 1 to Figure 4As shown, this embodiment provides a normally closed pilot solenoid valve. The normally closed pilot solenoid valve includes a main valve part 100 and an electromagnetic part 200, wherein the main valve part 100 includes a pilot structure 110, a main valve core 120, a main valve sleeve 130 and a main valve end cover 140, the main valve sleeve 130 is provided with a first opening 1 and a throttle hole 3, the main valve end cover 140 is provided with a second opening 2, the electromagnetic part 200 can drive the main valve core 120 to block the first opening 1 and the second opening 2, the pilot structure 110 is provided on the main valve core 120, and the pilot structure 110 and the main valve core 120 are connected. A first passage and a second passage are formed between the main valve sleeve 130, and the first passage and the second passage can respectively connect the throttling hole 3 and the second opening 2. When the high-pressure medium flows from the first opening 1 and the throttling hole 3 to the second opening 2, the first passage works and the second passage is blocked. The first passage is configured to increase the opening pressure of the main valve core 120; when the high-pressure medium flows from the second opening 2 into the first opening 1 and the throttling hole 3, the second passage works, the first passage is blocked, and the second passage is configured to increase the opening pressure of the main valve core 120.

[0063] The normally closed pilot solenoid valve is provided with a first opening 1 and a throttle hole 3 on the main valve sleeve 130, and a second opening 2 on the main valve end cover 140. The electromagnetic part 200 drives the main valve core 120 to block the first opening 1 and the second opening 2, thereby meeting the blocking requirements of the first opening 1 and the second opening 2. By providing the pilot structure 110 on the main valve core 120, a first passage and a second passage are formed between the pilot structure 110, the main valve core 120 and the main valve sleeve 130, ensuring that the first passage and the second passage can both conduct the throttle hole 3 and the second opening 2. When the high-pressure medium flows from the first opening 1 and the throttle hole 3 to the second opening 2 , the first passage is made to work and the second passage is blocked, and the first passage is used to increase the opening pressure of the main valve core 120. When the high-pressure medium flows from the second opening 2 into the first opening 1 and the throttle hole 3, the second passage is made to work and the first passage is blocked, and the second passage is used to increase the opening pressure of the main valve core 120. Regardless of the flow direction of the high-pressure medium, the opening pressure of the main valve core 120 can be increased without changing the output power of the electromagnetic part 200, that is, the maximum closing pressure that the normally closed pilot solenoid valve can withstand is increased, so as to be suitable for high-pressure media with higher pressure, meet actual needs, and improve the scope of application.

[0064] It should be noted that, in this embodiment, the normally closed pilot solenoid valve further includes a sleeve (not shown in the figure), and the sleeve is also sleeved in the connection area between the main valve part 100 and the solenoid part 200.

[0065] like Figure 2 to Figure 6As shown, the pilot structure 110 includes a pilot valve core 111, a pilot valve seat 112, a guide rod 113 and a one-way guide member 114, wherein the pilot valve seat 112 is fixed on the main valve core 120, the pilot valve core 111 is connected to the electromagnetic part 200, and the electromagnetic part 200 can drive the pilot valve core 111 to abut against the pilot valve seat 112, so that the main valve core 120 blocks the first opening 1 and the second opening 2, the guide rod 113 is arranged on the main valve core 120, and the one-way guide member 114 is arranged between the guide rod 113 and the pilot valve seat 112, and the pilot valve seat 112 is provided with a first docking hole 1121, a second docking hole 1122 and a third docking hole 1123 which are connected to each other, the guide rod 113 is provided with a guide hole 1131, and the main valve core 120 is provided with a fourth docking hole 12 1. The fifth docking hole 122 and the storage cavity 123, the guide hole 1131 and the fifth docking hole 122 are respectively communicated with the second opening 2; the fourth docking hole 121, the first docking hole 1121, the second docking hole 1122, the storage cavity 123 and the fifth docking hole 122 constitute a first passage, the pilot valve core 111 is connected to the electromagnetic part 200, and the electromagnetic part 200 can drive the pilot valve core 111 to block the second docking hole 1122 and drive the main valve core 120 to block the first opening 1 and the second opening 2; the guide hole 1131, the third docking hole 1123, the first docking hole 1121 and the fourth docking hole 121 constitute a second passage, and the one-way guide member 114 has a one-way guide function for allowing high-pressure medium to flow from the guide hole 1131 into the third docking hole 1123.

[0066] When the high-pressure medium flows from the first opening 1 and the throttle hole 3 to the second opening 2, the high-pressure medium cannot flow directly from the first opening 1 to the second opening 2 because the main valve core 120 blocks the first opening 1 and the second opening 2. However, the high-pressure medium can flow into the fourth docking hole 121, the first docking hole 1121 and the second docking hole 1122 in sequence along the throttle hole 3. In combination with the electromagnetic part 200 driving the pilot valve core 111 to block the second docking hole 1122, the high-pressure medium will temporarily exist on the side of the main valve core 120 away from the second opening 2. Since the pressure on the side of the main valve core 120 close to the second opening 2 is lower than the pressure of the high-pressure medium, the high-pressure medium temporarily existing on the side of the main valve core 120 away from the second opening 2 applies pressure to the main valve core 120 to move toward the second opening 2, so as to further increase the opening pressure of the main valve core 120, so that the high-pressure medium flowing in along the first opening 1 applies a greater pressure to the main valve core 120 to drive the main valve core 120 to open. On this basis, when the blocking force of the electromagnetic part 200 driving the pilot valve core 111 on the second docking hole 1122 is reduced, the high-pressure medium temporarily stored in the main valve core 120 on the side away from the second opening 2 will first push the pilot valve core 111 open from the second docking hole 1122, so that the high-pressure medium temporarily stored in the main valve core 120 on the side away from the second opening 2 flows into the storage chamber 123, and flows into the second opening 2 along the fifth docking hole 122. At the moment when the pilot valve core 111 is pushed open from the second docking hole 1122 by the high-pressure medium, the pressure of the high-pressure medium temporarily stored in the main valve core 120 on the side away from the second opening 2 on the main valve core 120 is instantly reduced. At this time, the pressure of the high-pressure medium in the first opening 1 on the main valve core 120 is greater than the pressure of the high-pressure medium temporarily stored in the main valve core 120 on the side away from the second opening 2 on the main valve core 120, and the high-pressure medium in the first opening 1 drives the main valve core 120 to open, so as to conduct the first opening 1 with the second opening 2.

[0067] When the high-pressure medium flows from the second opening 2 to the first opening 1 and the throttle hole 3, the high-pressure medium cannot flow directly from the second opening 2 into the first opening 1 and the throttle hole 3 because the main valve core 120 blocks the first opening 1 and the second opening 2. However, the high-pressure medium can flow into the guide hole 1131, the third docking hole 1123, the first docking hole 1121 and the fourth docking hole 121 in sequence and then temporarily store at the end of the main valve core 120 away from the second opening 2 and flow into the throttle hole 3. Due to the throttling effect of the throttle hole 3, the high-pressure medium temporarily stored at the end of the main valve core 120 away from the second opening 2 will exert pressure on the main valve core 120 to move closer to the second opening 2, so as to further increase the opening pressure of the main valve core 120, so that the high-pressure medium flowing in along the second opening 2 exerts a greater pressure on the main valve core 120 to drive the main valve core 120 to open. On this basis, when the sealing force of the electromagnetic part 200 driving the pilot valve core 111 on the second docking hole 1122 is reduced, that is, the sealing pressure applied by the electromagnetic part 200 to the main valve core 120 is reduced, the high-pressure medium at the second opening 2 overcomes the sealing pressure applied by the electromagnetic part 200 to the main valve core 120 and the sealing pressure applied by the high-pressure medium temporarily stored at the end of the main valve core 120 away from the second opening 2 to the main valve core 120, so as to open the main valve core 120 and allow the high-pressure medium to flow into the first opening 1 along the second opening 2.

[0068] Combination Figures 5 to 8The specific structure of the one-way conductive member 114 is described. The one-way conductive member 114 includes a lap joint 1141 and a deformable portion 1142 connected in sequence, the lap joint 1141 is arranged around the outer periphery of the deformable portion 1142, the lap joint 1141 and the deformable portion 1142 are respectively lapped on the end surface of the third docking hole 1123 away from the guide hole 1131, the deformable portion 1142 blocks the third docking hole 1123, and the deformable portion 1142 can be deformed along the axial direction of the third docking hole 1123 toward a direction away from the guide hole 1131, so that the high-pressure medium flows from the guide hole 1131 into the third docking hole 1123. When the high-pressure medium flows from the guide hole 1131 to the third docking hole 1123, since the one-way conductive member 114 is arranged on the end face of the third docking hole 1123 away from the guide hole 1131, the pressure generated by the high-pressure medium will drive the deformation part 1142 to deform in the axial direction of the third docking hole 1123 away from the guide hole 1131, so that the deformation part 1142 blocked on the third docking hole 1123 opens, thereby achieving the effect of the high-pressure medium flowing from the guide hole 1131 to the third docking hole 1123. When the high-pressure medium flows from the third docking hole 1123 to the guide hole 1131, since the overlapping portion 1141 overlaps the end surface of the third docking hole 1123 away from the guide hole 1131, the pressure generated by the high-pressure medium will drive the deformation portion 1142 to tilt along the axial direction of the third docking hole 1123 toward the direction close to the guide hole 1131, so as to further improve the blocking effect of the deformation portion 1142 on the third docking hole 1123, and prevent the high-pressure medium from flowing into the guide hole 1131 along the third docking hole 1123, so as to realize the one-way conduction function of the one-way conduction member 114.

[0069] As an alternative, Fig. 9 As shown, the main valve core 120 is provided with a plurality of fourth docking holes 121 at intervals along the circumferential direction, and each fourth docking hole 121 is communicated with a first docking hole 1121. It can be understood that when the high-pressure medium flows from the first opening 1 and the throttle hole 3 into the second opening 2, the number of the fourth docking holes 121 is inversely proportional to the opening pressure of the main valve core 120, and the aperture of the fourth docking hole 121 is inversely proportional to the opening pressure of the main valve core 120. The smaller the number of the fourth docking holes 121 and the smaller the aperture of the fourth docking holes 121, the greater the opening pressure of the main valve core 120. In this embodiment, three fourth docking holes 121 are arranged at intervals along the circumferential direction in the main valve core 120, and each fourth docking hole 121 is communicated with a corresponding first docking hole 1121, and the aperture of each fourth docking hole 121 is 2 mm. In other embodiments, the specific number of the fourth docking holes 121 in the main valve core 120 and the hole sizes of the fourth docking holes 121 may also be adjusted according to actual needs, which is not specifically limited in this embodiment.

[0070] In order to further increase the rate at which the high-pressure medium flows from the storage chamber 123 into the second opening 2, the main valve core 120 is provided with a plurality of fifth docking holes 122 at intervals along the circumferential direction, and each fifth docking hole 122 is simultaneously communicated with the second opening 2 and the storage chamber 123. It should be noted that, in this embodiment, three fifth docking holes 122 are provided at intervals along the circumferential direction in the main valve core 120, so that the high-pressure medium in the storage chamber 123 can simultaneously flow into the second opening 2 along the three fifth docking holes 122. In other embodiments, the specific number of the fifth docking holes 122 can also be adjusted according to actual needs, and this embodiment does not make a specific limitation.

[0071] As an alternative, Figure 2 As shown, the electromagnetic part 200 includes an armature 210, a tail bell 220, a front bell 230, a push rod 260 and a coil assembly 240, wherein one end surface of the tail bell 220 is provided with a receiving hole 221 extending axially, the armature 210 is movably installed in the receiving hole 221, the front bell 230 is fixed to the tail bell 220, the front bell 230 is configured to block the receiving hole 221, the front bell 230 is connected to the main valve part 100, the push rod 260 passes through the front bell 230, one end of the push rod 260 is connected to the armature 210, and the other end of the push rod 260 is connected to the pilot valve core 111, the coil assembly 240 is arranged on the outer periphery of the tail bell 220, and the coil assembly 240 is configured to drive the armature 210 to move in the receiving hole 221 to drive the main valve core 120 to block the first opening 1 and the second opening 2. The electromagnetic force generated by the coil assembly 240 after being energized drives the armature 210 to move, thereby driving the push rod 260 connected to the armature 210 to move, so as to block the second docking hole 1122 with the pilot valve core 111 and drive the main valve core 120 to block the first opening 1 and the second opening 2.

[0072] To improve the safety of the armature 210, the electromagnetic part 200 also includes a second elastic member 250, wherein the second elastic member 250 is arranged in the accommodating hole 221, and the two ends of the second elastic member 250 are respectively abutted against the armature 210 and the hole wall of the accommodating hole 221 away from the front yoke 230.

[0073] In addition, the electromagnetic part 200 also includes a third elastic member 270, wherein the third elastic member 270 is arranged in the receiving hole 221, and the two ends of the third elastic member 270 are respectively in contact with the armature 210 and the front armature 230. It should be noted that, in this embodiment, the electromagnetic part 200 includes both the second elastic member 250 and the third elastic member 270, and both the second elastic member 250 and the third elastic member 270 are springs. In other embodiments, the electromagnetic part 200 may also include only the second elastic member 250 or only the third elastic member 270, which is not specifically limited in this embodiment.

[0074] In order to prevent the electromagnetic part 200 from affecting the main valve part 100, the electromagnetic part 200 also includes a magnetic isolation ring 280, which is arranged between the front bell 230 and the rear bell 220. The magnetic isolation ring 280 can effectively reduce the interference of the magnetic field generated by the coil assembly 240 during operation on the main valve part 100, thereby protecting the main valve part 100.

[0075] Embodiment 2

[0076] This embodiment provides a normally closed pilot solenoid valve. The specific structure of the normally closed pilot solenoid valve provided in this embodiment is basically the same as that of the first embodiment. The difference between the normally closed pilot solenoid valve provided in this embodiment and the first embodiment is that the specific structure of the one-way conducting member 114 is different.

[0077] like Figure 10 to Figure 12 As shown, the one-way guide member 114 includes a blocking ball 1143 and a first elastic member 1144, wherein the guide hole 1131 includes a first guide portion 11311 and a second guide portion 11312 which are connected in sequence, the second guide portion 11312 is located at an end of the first guide portion 11311 away from the third docking hole 1123, the aperture of the second guide portion 11312 is smaller than the diameter of the blocking ball 1143, the blocking ball 1143 slides axially along the first guide portion 11311, the blocking ball 1143 is configured to block the second guide portion 11312, the first elastic member 1144 is arranged between the blocking ball 1143 and the pilot valve seat 112, and the two ends of the first elastic member 1144 are respectively abutted against the blocking ball 1143 and the pilot valve seat 112. When the high-pressure medium flows into the third docking hole 1123 along the guide hole 1131, the high-pressure medium drives the blocking ball 1143 to approach the third docking hole 1123 along the axial direction of the first guide part 11311 and compress the first elastic member 1144, so that the blocking ball 1143 blocked at the second guide part 11312 is removed, so as to achieve the effect of the high-pressure medium flowing from the guide hole 1131 to the third docking hole 1123. When the high-pressure medium flows into the guide hole 1131 along the third docking hole 1123, the high-pressure medium drives the blocking ball 1143 to approach the second guide part 11312 along the axial direction of the first guide part 11311, so that the blocking ball 1143 blocks the second guide part 11312, so as to prevent the high-pressure medium from flowing from the third docking hole 1123 to the guide hole 1131, thereby achieving unidirectional conduction of the high-pressure medium from the guide hole 1131 to the third docking hole 1123.

[0078] 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. Normally closed pilot solenoid valve, characterized in that: include: Electromagnetic part (200); as well as A main valve part (100), the main valve part (100) comprising a pilot structure (110), a main valve core (120), a main valve sleeve (130) and a main valve end cover (140), the main valve sleeve (130) being provided with a first opening (1) and a throttle hole (3), the main valve end cover (140) being provided with a second opening (2), the electromagnetic part (200) being capable of driving the main valve core (120) to block the first opening (1) and the second opening (2); The pilot structure (110) is arranged on the main valve core (120), and a first passage and a second passage are formed between the pilot structure (110), the main valve core (120) and the main valve sleeve (130), and the first passage and the second passage can respectively conduct the throttle hole (3) and the second opening (2); When the high-pressure medium flows from the first opening (1) and the throttle hole (3) to the second opening (2), the first passage works and the second passage is blocked, and the first passage is configured to increase the opening pressure of the main valve core (120); When the high-pressure medium flows from the second opening (2) into the first opening (1) and the throttle hole (3), the second passage operates, the first passage is blocked, and the second passage is configured to increase the opening pressure of the main valve core (120).

2. The normally closed pilot solenoid valve according to claim 1, characterized in that: The pilot structure (110) comprises: Pilot valve core (111); a pilot valve seat (112) fixed on the main valve core (120); the pilot valve core (111) is connected to the electromagnetic part (200); the electromagnetic part (200) is capable of driving the pilot valve core (111) to abut against the pilot valve seat (112), so that the main valve core (120) blocks the first opening (1) and the second opening (2); A guide rod (113) is arranged on the main valve core (120); and a one-way conducting member (114) disposed between the guide rod (113) and the pilot valve seat (112); the pilot valve seat (112) is provided with a first docking hole (1121), a second docking hole (1122) and a third docking hole (1123) which are in communication with each other; the guide rod (113) is provided with a flow guide hole (1131); the main valve core (120) is provided with a fourth docking hole (121), a fifth docking hole (122) and a storage chamber (123); the flow guide hole (1131) and the fifth docking hole (122) are in communication with the second opening (2) respectively; The fourth docking hole (121), the first docking hole (1121), the second docking hole (1122), the storage chamber (123) and the fifth docking hole (122) constitute the first passage; the pilot valve core (111) is connected to the electromagnetic part (200); the electromagnetic part (200) can drive the pilot valve core (111) to block the second docking hole (1122) and drive the main valve core (120) to block the first opening (1) and the second opening (2); The guide hole (1131), the third docking hole (1123), the first docking hole (1121) and the fourth docking hole (121) constitute the second passage, and the one-way conducting member (114) has a one-way conducting function for allowing the high-pressure medium to flow from the guide hole (1131) into the third docking hole (1123).

3. The normally closed pilot solenoid valve according to claim 2, characterized in that: The one-way conductive member (114) comprises a lap joint (1141) and a deformation portion (1142) connected in sequence, wherein the lap joint (1141) is arranged around the outer periphery of the deformation portion (1142), and the lap joint (1141) and the deformation portion (1142) are respectively lap jointed on the end surface of the third docking hole (1123) away from the guide hole (1131), and the deformation portion (1142) blocks the third docking hole (1123), and the deformation portion (1142) can be deformed along the axial direction of the third docking hole (1123) in a direction away from the guide hole (1131), so that the high-pressure medium flows from the guide hole (1131) into the third docking hole (1123).

4. The normally closed pilot solenoid valve according to claim 2, characterized in that: The one-way conductive member (114) comprises: a blocking ball (1143), wherein the flow guide hole (1131) comprises a first flow guide portion (11311) and a second flow guide portion (11312) which are connected in sequence, the second flow guide portion (11312) is located at an end of the first flow guide portion (11311) away from the third docking hole (1123), the aperture of the second flow guide portion (11312) is smaller than the aperture of the blocking ball (1143), the blocking ball (1143) slides along the axial direction of the first flow guide portion (11311), and the blocking ball (1143) is configured to block the second flow guide portion (11312); and A first elastic member (1144), wherein the first elastic member (1144) is disposed between the blocking ball (1143) and the pilot valve seat (112), and two ends of the first elastic member (1144) are respectively in contact with the blocking ball (1143) and the pilot valve seat (112).

5. The normally closed pilot solenoid valve according to claim 2, characterized in that: The main valve core (120) is provided with a plurality of fourth docking holes (121) spaced apart along the circumferential direction, and each of the fourth docking holes (121) is in communication with one of the first docking holes (1121).

6. The normally closed pilot solenoid valve according to claim 2, characterized in that: The main valve core (120) is provided with a plurality of fifth docking holes (122) spaced apart along the circumferential direction, and each of the fifth docking holes (122) is communicated with the second opening (2) and the storage chamber (123) at the same time.

7. The normally closed pilot solenoid valve according to claim 1, characterized in that: The electromagnetic part (200) comprises: Armature (210); A tail end (220), wherein one end surface of the tail end (220) is provided with a receiving hole (221) extending in the axial direction, and the armature (210) is movably mounted in the receiving hole (221); A front bell (230) is fixed to the rear bell (220), the front bell (230) is configured to block the accommodating hole (221), and the front bell (230) is connected to the main valve part (100); a push rod (260), the push rod (260) passing through the front yoke (230), one end of the push rod (260) being connected to the armature (210), and the push rod (260) being capable of driving the main valve core (120) to block the first opening (1) and the second opening (2); and The coil assembly (240) is arranged on the outer periphery of the tailgate (220), and the coil assembly (240) is configured to drive the armature (210) to move in the accommodating hole (221).

8. The normally closed pilot solenoid valve according to claim 7, characterized in that: The electromagnetic part (200) further comprises: The second elastic member (250) is arranged in the accommodating hole (221), and two ends of the second elastic member (250) are respectively in contact with the armature (210) and the hole wall of the accommodating hole (221) away from the front elbow (230).

9. The normally closed pilot solenoid valve according to claim 7, characterized in that: The electromagnetic part (200) further comprises: The third elastic member (270) is arranged in the accommodating hole (221), and two ends of the third elastic member (270) are respectively in contact with the armature (210) and the front armature (230).

10. The normally closed pilot solenoid valve according to claim 7, characterized in that: The electromagnetic part (200) further comprises: The magnetic isolation ring (280) is arranged between the front ring (230) and the rear ring (220).

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