Normally closed pilot solenoid valve

Abstract

The present application relates to the technical field of vehicle body damping, and particularly relates 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 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, the electromagnetic part can drive the main valve core to block the first opening and the second opening, the pilot structure is arranged on the main valve core, the pilot structure and the main valve core and the main valve sleeve form a first passage and a second passage, the first passage and the second passage can respectively guide the throttle hole and the second opening, when 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, the first passage is configured to increase the opening pressure of the main valve core, when high-pressure medium flows from the second opening into the first opening and the throttle hole, the second passage works and the first passage is blocked, the second passage is configured to increase the opening pressure of the main valve core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle body damping, and in particular to a normally closed pilot electromagnetic valve. BACKGROUND

[0002] At present, the vibration in the vehicle driving is mainly attenuated through the vehicle suspension system. The vehicle suspension system is divided into passive suspension, semi-active suspension and active suspension. The semi-active suspension has become the first choice of the vehicle suspension system due to its better consideration of driving smoothness and steering stability, simple structure and relatively low price. The core component of the semi-active suspension is a damping adjustable shock absorber, and the normally closed pilot electromagnetic 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 gradually develops towards high power and high horsepower, so that the pressure of high-pressure oil in the vehicle suspension system increases. The maximum closing pressure that can be borne by the existing normally closed pilot electromagnetic valve is less than the pressure applied by the actual high-pressure oil. The existing normally closed pilot electromagnetic valve cannot be adapted to the high-pressure oil in the vehicle suspension system.

[0004] Therefore, it is urgent to invent a normally closed pilot electromagnetic valve to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a normally closed pilot electromagnetic valve to increase the maximum closing pressure that can be borne by the normally closed pilot electromagnetic valve under the premise of the same electromagnetic valve output power, meet the actual demand and increase the use range.

[0006] To achieve this purpose, the technical scheme adopted by the present application is as follows:

[0007] The normally closed pilot electromagnetic valve comprises:

[0008] An electromagnetic part; and

[0009] A main valve part, the main valve part comprising a pilot structure, a main valve core, a main valve sleeve and a main valve end cover, the main valve sleeve being provided with a first opening and an orifice, the main valve end cover being provided with a second opening, the electromagnetic part being capable of driving 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 the pilot structure forms a first passage and a second passage with the main valve core and the main valve sleeve, the first passage and the second passage being capable of conducting the orifice and the second opening, respectively;

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

[0013] As an option, the pilot structure comprises:

[0014] a pilot valve core;

[0015] a pilot valve seat fixed on the main valve core, the pilot valve core being connected with the electromagnetic part, the electromagnetic part being capable of driving the pilot valve core to abut against the pilot valve seat to block the first opening and the second opening of the main valve core;

[0016] a guide rod arranged on the main valve core; and

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

[0018] the fourth abutting hole, the first abutting hole, the second abutting hole, the storage cavity and the fifth abutting hole constitute the first passage, the pilot valve core being connected with the electromagnetic part, the electromagnetic part being capable of driving the pilot valve core to block the second abutting hole and driving the main valve core to block the first opening and the second opening;

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

[0020] As an option, the one-way conducting member comprises a lap joint portion and a deformation portion connected in sequence, the lap joint portion being arranged around the periphery of the deformation portion, the lap joint portion and the deformation portion being respectively lap jointed on the end face of the third abutting hole away from the flow guide hole, the deformation portion blocking the third abutting hole, and the deformation portion being capable of deforming in the direction away from the flow guide hole along the axial direction of the third abutting hole, so that the high-pressure medium flows from the flow guide hole into the third abutting hole.

[0021] As an option, the one-way conducting member comprises:

[0022] The shutoff ball is configured to seal the second flow-through part.

[0023] The first elastic member is arranged between the shutoff ball and the pilot valve seat, and two ends of the first elastic member abut against the shutoff ball and the pilot valve seat respectively.

[0024] Optionally, the main valve core is provided with a plurality of fourth abutting holes at intervals in the circumferential direction, and each fourth abutting hole is in communication with a first abutting hole.

[0025] Optionally, the main valve core is provided with a plurality of fifth abutting holes at intervals in the circumferential direction, and each fifth abutting hole is in communication with the second opening and the storage cavity at the same time.

[0026] Optionally, the electromagnetic part comprises:

[0027] An armature;

[0028] A tail core, one end surface of the tail core is provided with an accommodating hole extending in the axial direction, and the armature is movably installed in the accommodating hole;

[0029] A front core fixed with the tail core, the front core is configured to seal the accommodating hole, and the front core is connected with the main valve part;

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

[0031] A coil assembly arranged on the outer periphery of the tail core, the coil assembly is configured to drive the armature to move in the accommodating hole.

[0032] Optionally, the electromagnetic part further comprises:

[0033] A second elastic member arranged in the accommodating hole, two ends of the second elastic member abut against the armature and a hole wall of the accommodating hole away from the front core respectively.

[0034] Optionally, the electromagnetic part further comprises:

[0035] A third elastic member arranged in the accommodating hole, two ends of the third elastic member abut against the armature and the front core respectively.

[0036] As an option, the electromagnetic portion further comprises:

[0037] A magnetic isolation ring is arranged between the front end and the tail end.

[0038] Advantages of the present application:

[0039] The constant closed pilot electromagnetic valve provided by the present application meets the blocking requirements of the first opening and the second opening by arranging the first opening and the throttle hole on the main valve sleeve, arranging the 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 portion. By arranging the pilot structure on the main valve core, the first passage and the second passage are formed between the pilot structure, the main valve core and the main valve sleeve, so 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 works and the second passage blocks, and the first passage realizes the effect of increasing the opening pressure of the main valve core. When the high-pressure medium flows from the second opening into the first opening and the throttle hole, the second passage works and the first passage blocks, and the second passage realizes the effect of increasing the opening pressure of the main valve core. Therefore, 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 portion, that is, the maximum closing pressure that the constant closed pilot electromagnetic valve can withstand is increased, so that it is suitable for high-pressure media with larger pressure, meets the actual demand, and improves the application range. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural schematic diagram of the constant closed pilot electromagnetic valve provided by the first embodiment of the present application;

[0041] Figure 2 is a sectional view schematic diagram of the constant closed pilot electromagnetic valve provided by the first embodiment of the present application;

[0042] Figure 3 is a path schematic diagram of the first passage in the constant closed pilot electromagnetic valve provided by the first embodiment of the present application;

[0043] Figure 4 is a path schematic diagram of the second passage in the constant closed pilot electromagnetic valve provided by the first embodiment of the present application;

[0044] Figure 5 is a sectional view schematic diagram of the main valve core and the pilot structure provided by the first embodiment of the present application;

[0045] Figure 6 is a sectional view schematic diagram of the pilot valve seat provided by the first embodiment of the present application;

[0046] Figure 7 is a structural schematic diagram of the one-way conduction piece provided by the first embodiment of the present application;

[0047] Figure 8 is a cross-sectional view of a one-way conducting member, a partial pilot valve seat and a partial guide rod provided by the first embodiment of the present application;

[0048] Figure 9 is a cross-sectional view of a main valve seat provided by the first embodiment of the present application;

[0049] Figure 10 is a cross-sectional view of a normally closed pilot solenoid valve provided by the second embodiment of the present application;

[0050] Figure 11 is a cross-sectional view of a main valve core and a pilot structure provided by the second embodiment of the present application;

[0051] Figure 12 is a cross-sectional view of a pilot valve seat, a guide rod and a one-way conducting member provided by the second embodiment of the present application.

[0052] In the figure:

[0053] 1, first opening; 2, second opening; 3, throttling hole;

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

[0055] 200, solenoid part; 210, armature; 220, tail yoke; 221, accommodating hole; 230, front yoke; 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 problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further explained below in combination with the drawings and through specific embodiments.

[0057] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0059] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0060] Embodiment one

[0061] The core component of the heavy semi-active suspension of the vehicle suspension system is the damping adjustable shock absorber, and the normally closed pilot electromagnetic valve is the most core damping element in the damping adjustable shock absorber. In the related art, with the continuous development of vehicle technology, the power system of the vehicle gradually develops towards high power and high horsepower, so that the pressure of high-pressure oil liquid in the vehicle suspension system increases. The maximum closing pressure that the existing normally closed pilot electromagnetic valve can withstand is less than the pressure applied by the actual high-pressure oil liquid, and the existing normally closed pilot electromagnetic valve cannot be adapted to the high-pressure oil liquid in the vehicle suspension system.

[0062] In order to solve the above problems, as Figures 1-4As shown, the embodiment provides a normally closed pilot electromagnetic valve. The normally closed pilot electromagnetic valve comprises a main valve part 100 and an electromagnetic part 200, wherein the main valve part 100 comprises a pilot structure 110, a main valve core 120, a main valve sleeve 130 provided with a first opening 1 and a throttling hole 3, and a main valve end cover 140 provided with a second opening 2, and 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 arranged on the main valve core 120, and the pilot structure 110, the main valve core 120 and the main valve sleeve 130 form a first passage and a second passage, the first passage and the second passage can respectively guide 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, 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 throttling hole 3, the second passage works and 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 electromagnetic valve sets the first opening 1 and the throttling hole 3 on the main valve sleeve 130, sets the second opening 2 on the main valve end cover 140, drives the main valve core 120 to block the first opening 1 and the second opening 2 by the electromagnetic part 200, meets the blocking requirement of the first opening 1 and the second opening 2, sets the pilot structure 110 on the main valve core 120, forms the first passage and the second passage among the pilot structure 110, the main valve core 120 and the main valve sleeve 130, ensures that the first passage and the second passage can guide the throttling hole 3 and the second opening 2, makes the first passage work and the second passage block when the high-pressure medium flows from the first opening 1 and the throttling hole 3 to the second opening 2, realizes the effect of increasing the opening pressure of the main valve core 120 by the first passage, makes the second passage work and the first passage block when the high-pressure medium flows from the second opening 2 into the first opening 1 and the throttling hole 3, realizes the effect of increasing the opening pressure of the main valve core 120 by the second passage, so that the opening pressure of the main valve core 120 can be increased without changing the output power of the electromagnetic part 200 regardless of the flow direction of the high-pressure medium, that is, the maximum closing pressure that the normally closed pilot electromagnetic valve can withstand is increased, so as to be applicable to high-pressure medium with larger pressure, meet the actual requirement and improve the application range.

[0064] It should be noted that in the embodiment, the normally closed pilot electromagnetic valve further comprises a sleeve (not shown in the figure) which is sleeved on the connection area of the main valve part 100 and the electromagnetic part 200.

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

[0066] When the high-pressure medium flows from the first opening 1 and the throttling 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 interface hole 121, the first interface hole 1121 and the second interface hole 1122 along the throttling hole 3 in turn. In combination with the electromagnetic part 200 driving the pilot valve core 111 to block the second interface hole 1122, the high-pressure medium is temporarily stored in the side of the main valve core 120 away from the second opening 2. Because 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 stored in the side of the main valve core 120 away from the second opening 2 exerts a pressure on the main valve core 120 to move towards 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 along the first opening 1 exerts greater pressure on the main valve core 120 to drive the main valve core 120 to open. On this basis, when the electromagnetic part 200 reduces the blocking force of the pilot valve core 111 on the second interface hole 1122, the high-pressure medium temporarily stored in the side of the main valve core 120 away from the second opening 2 will first push the pilot valve core 111 away from the second interface hole 1122, so that the high-pressure medium temporarily stored in the side of the main valve core 120 away from the second opening 2 flows into the storage cavity 123 and flows into the second opening 2 along the fifth interface hole 122. At the moment when the pilot valve core 111 is pushed away from the second interface hole 1122 by the high-pressure medium, the pressure of the high-pressure medium temporarily stored in the side of the main valve core 120 away from the second opening 2 on the main valve core 120 instantaneously decreases, and 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 side of the main valve core 120 away from the second opening 2 on the main valve core 120. The high-pressure medium in the first opening 1 drives the main valve core 120 to open, so as to connect the first opening 1 and the second opening 2.

[0067] When the high-pressure medium flows from the second opening 2 to the first opening 1 and the throttling hole 3, the high-pressure medium cannot directly flow from the second opening 2 to the first opening 1 and the throttling hole 3 because the main valve core 120 blocks the first opening 1 and the second opening 2. But the high-pressure medium can flow into the flow guide hole 1131, the third abutting hole 1123, the first abutting hole 1121 and the fourth abutting hole 121 in turn, be temporarily stored at the end of the main valve core 120 away from the second opening 2 and flow into the throttling hole 3. Due to the throttling effect of the throttling 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 a pressure on the main valve core 120 to move towards 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 along the second opening 2 exerts 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 pilot valve core 111 to the second abutting hole 1122 driven by the electromagnetic part 200 is reduced, that is, the sealing pressure exerted by the electromagnetic part 200 on the main valve core 120 is reduced, the high-pressure medium at the second opening 2 overcomes the sealing pressure exerted by the electromagnetic part 200 on the main valve core 120 and the sealing pressure exerted by the high-pressure medium temporarily stored at the end of the main valve core 120 away from the second opening 2 on the main valve core 120, so as to open the main valve core 120 and make the high-pressure medium flow along the second opening 2 into the first opening 1.

[0068] In combination Figures 5-8The specific structure of the one-way conducting piece 114 is described. The one-way conducting piece 114 includes a lap joint portion 1141 and a deformation portion 1142 connected in sequence, the lap joint portion 1141 is arranged around the outer periphery of the deformation portion 1142, the lap joint portion 1141 and the deformation portion 1142 are respectively lap jointed on the end face of the third connecting hole 1123 away from the flow guide hole 1131, the deformation portion 1142 blocks the third connecting hole 1123, and the deformation portion 1142 can be deformed in the direction away from the flow guide hole 1131 along the axial direction of the third connecting hole 1123, so that the high-pressure medium flows into the third connecting hole 1123 from the flow guide hole 1131. When the high-pressure medium flows from the flow guide hole 1131 to the third connecting hole 1123, due to the one-way conducting piece 114 arranged on the end face of the third connecting hole 1123 away from the flow guide hole 1131, the pressure generated by the high-pressure medium drives the deformation portion 1142 to deform in the direction away from the flow guide hole 1131 along the axial direction of the third connecting hole 1123, so that the deformation portion 1142 blocking the third connecting hole 1123 is opened, realizing the effect that the high-pressure medium flows from the flow guide hole 1131 to the third connecting hole 1123. When the high-pressure medium flows from the third connecting hole 1123 to the flow guide hole 1131, due to the lap joint portion 1141 lap jointed on the end face of the third connecting hole 1123 away from the flow guide hole 1131, the pressure generated by the high-pressure medium drives the deformation portion 1142 to tilt in the direction close to the flow guide hole 1131 along the axial direction of the third connecting hole 1123, so as to further improve the blocking effect of the deformation portion 1142 on the third connecting hole 1123, prevent the high-pressure medium from flowing into the flow guide hole 1131 along the third connecting hole 1123, and realize the one-way conducting function of the one-way conducting piece 114.

[0069] As an optional solution, as shown in Figure 9 The main valve core 120 is circumferentially spaced apart and provided with a plurality of fourth connecting holes 121, and each fourth connecting hole 121 is in communication with a first connecting hole 1121. It can be understood that when the high-pressure medium flows from the first opening 1 and the throttling hole 3 into the second opening 2, the number of the fourth connecting holes 121 is inversely proportional to the opening pressure of the main valve core 120, and the aperture of the fourth connecting hole 121 is inversely proportional to the opening pressure of the main valve core 120. The smaller the number of the fourth connecting holes 121 and the smaller the aperture of the fourth connecting holes 121, the greater the opening pressure of the main valve core 120. In this embodiment, the main valve core 120 is circumferentially spaced apart and provided with three fourth connecting holes 121, each fourth connecting hole 121 is in communication with a corresponding first connecting hole 1121, and the aperture of each fourth connecting hole 121 is 2mm. In other embodiments, the specific number of the fourth connecting holes 121 in the main valve core 120 and the aperture of the fourth connecting holes 121 can be adjusted according to actual needs, and this embodiment is not limited in particular.

[0070] To further improve the rate of the high-pressure medium flowing from the storage cavity 123 into the second opening 2, the main valve core 120 is circumferentially spaced apart with a plurality of fifth connecting holes 122, each of which is simultaneously communicated with the second opening 2 and the storage cavity 123. It should be noted that in the embodiment, the main valve core 120 is circumferentially spaced apart with three fifth connecting holes 122, so that the high-pressure medium in the storage cavity 123 can flow into the second opening 2 through the three fifth connecting holes 122 at the same time. In other embodiments, the specific number of the fifth connecting holes 122 can be adjusted according to actual needs, and the embodiment is not limited in particular.

[0071] As an optional solution, as shown in Figure 2 The electromagnetic part 200 includes an armature 210, a tail 220, a front 230, a push rod 260, and a coil assembly 240. The tail 220 has an axially extending accommodating hole 221 at one end, and the armature 210 is movably installed in the accommodating hole 221. The front 230 is fixed to the tail 220 and is configured to block the accommodating hole 221. The front 230 is connected to the main valve part 100. The push rod 260 passes through the front 230, with one end connected to the armature 210 and the other end connected to the pilot valve core 111. The coil assembly 240 is arranged on the outer periphery of the tail 220 and is configured to drive the armature 210 to move in the accommodating hole 221, so as to drive the main valve core 120 to block the first opening 1 and the second opening 2. The electromagnetic force generated by the energization of the coil assembly 240 drives the armature 210 to move, and in turn drives the push rod 260 connected to the armature 210 to move, so as to block the second connecting hole 1122 of 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 further includes a second elastic member 250. The second elastic member 250 is arranged in the accommodating hole 221, and the two ends of the second elastic member 250 abut against the armature 210 and the hole wall of the accommodating hole 221 away from the front 230, respectively.

[0073] In addition, the electromagnetic part 200 further includes a third elastic member 270. The third elastic member 270 is arranged in the accommodating hole 221, and the two ends of the third elastic member 270 abut against the armature 210 and the front 230, respectively. It should be noted that in the embodiment, the electromagnetic part 200 simultaneously includes 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 can only include the second elastic member 250 or only include the third elastic member 270, and the embodiment is not limited in particular.

[0074] To avoid the electromagnetic part 200 affecting the main valve part 100, the electromagnetic part 200 further comprises a magnetic isolation ring 280 arranged between the front collar 230 and the tail collar 220, which can effectively reduce the magnetic field generated by the coil assembly 240 when working to interfere with the main valve part 100, thereby protecting the main valve part 100.

[0075] Embodiment two

[0076] The embodiment provides a normally closed pilot electromagnetic valve. The normally closed pilot electromagnetic valve provided by the embodiment has basically the same specific structure as that of embodiment one, and the difference between the normally closed pilot electromagnetic valve provided by the embodiment and embodiment one is that the specific structure of the one-way conducting member 114 is different.

[0077] As shown in Figures 10-12 The one-way conducting member 114 comprises a blocking ball 1143 and a first elastic member 1144. The flow guide hole 1131 comprises a first flow guide part 11311 and a second flow guide part 11312 that are sequentially conducted. The second flow guide part 11312 is located at an end of the first flow guide part 11311 away from the third abutting hole 1123, and the hole diameter of the second flow guide part 11312 is smaller than the diameter of the blocking ball 1143. The blocking ball 1143 slides along the axial direction of the first flow guide part 11311, and the blocking ball 1143 is configured to block the second flow guide part 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 abut the blocking ball 1143 and the pilot valve seat 112, respectively. When the high-pressure medium flows into the third abutting hole 1123 along the flow guide hole 1131, the high-pressure medium drives the blocking ball 1143 to move along the axial direction of the first flow guide part 11311 to be close to the third abutting hole 1123 and compress the first elastic member 1144, so that the blocking ball 1143 blocked at the second flow guide part 11312 is removed, thereby realizing the effect that the high-pressure medium flows along the flow guide hole 1131 to the third abutting hole 1123. When the high-pressure medium flows along the third abutting hole 1123 to the flow guide hole 1131, the high-pressure medium drives the blocking ball 1143 to move along the axial direction of the first flow guide part 11311 to be close to the second flow guide part 11312, so that the blocking ball 1143 blocks the second flow guide part 11312, thereby preventing the high-pressure medium from flowing along the third abutting hole 1123 to the flow guide hole 1131, and realizing the one-way conduction of the high-pressure medium from the flow guide hole 1131 to the third abutting hole 1123.

[0078] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A normally closed pilot-operated solenoid valve, characterized in that, include: Electromagnetic section (200); as well as The main valve section (100) includes a pilot structure (110), a main valve core (120), a main valve sleeve (130), and a main valve end cap (140). The main valve sleeve (130) is provided with a first opening (1) and a throttling orifice (3). The main valve end cap (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 disposed on the main valve core (120). The pilot structure (110) includes a pilot valve core (111), a pilot valve seat (112), a guide rod (113), and a one-way guide element (114). 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). 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 main valve core (120). The first opening (1) and the second opening (2); the guide rod (113) is disposed on the main valve core (120); the unidirectional guide member (114) is disposed between the guide rod (113) and the pilot valve seat (112), the pilot valve seat (112) is provided with a first mating hole (1121), a second mating hole (1122) and a third mating hole (1123) that are mutually connected, the guide rod (113) is provided with a flow guide hole (1131), and the main valve core (120) is provided with a fourth mating hole (121) and a fifth mating hole. (122) and storage cavity (123), the guide hole (1131) and the fifth docking hole (122) are respectively connected to 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) form 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. The orifice (1122) and the main valve core (120) are used 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) form a second passage; the unidirectional guide member (114) has a unidirectional conduction function to allow high pressure medium to flow from the guide hole (1131) into the third docking hole (1123); the first passage and the second passage can respectively connect the throttle hole (3) and the second opening (2). When the high-pressure medium flows from the first opening (1) and the throttle orifice (3) to the second opening (2), the first passage is activated 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 throttle orifice (3), the second passage is activated, 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-operated solenoid valve according to claim 1, characterized in that, The unidirectional guide (114) includes an overlapping portion (1141) and a deformable portion (1142) connected in sequence. The overlapping portion (1141) surrounds the outer periphery of the deformable portion (1142). The overlapping portion (1141) and the deformable portion (1142) respectively overlap the end face of the third docking hole (1123) away from the guide hole (1131). The deformable portion (1142) blocks the third docking hole (1123). The deformable portion (1142) can deform 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 into the third docking hole (1123) from the guide hole (1131).

3. The normally closed pilot-operated solenoid valve according to claim 1, characterized in that, The unidirectional conductor (114) includes: A plugging ball (1143), wherein the guide hole (1131) includes a first guide portion (11311) and a second guide portion (11312) that are sequentially connected, the second guide portion (11312) is located at the end of the first guide portion (11311) away from the third docking hole (1123), the diameter of the second guide portion (11312) is smaller than the diameter of the plugging ball (1143), the plugging ball (1143) slides along the axial direction of the first guide portion (11311), and the plugging ball (1143) is configured to plug the second guide portion (11312); and A first elastic element (1144) is disposed between the sealing ball (1143) and the pilot valve seat (112), and the two ends of the first elastic element (1144) abut against the sealing ball (1143) and the pilot valve seat (112) respectively.

4. The normally closed pilot-operated solenoid valve according to claim 1, characterized in that, The main valve core (120) is provided with a plurality of fourth docking holes (121) spaced apart along the circumference, and each of the fourth docking holes (121) is connected to one of the first docking holes (1121).

5. The normally closed pilot-operated solenoid valve according to claim 1, characterized in that, The main valve core (120) is provided with a plurality of fifth docking holes (122) spaced apart along the circumference, and each fifth docking hole (122) is simultaneously connected to the second opening (2) and the storage cavity (123).

6. The normally closed pilot-operated solenoid valve according to claim 1, characterized in that, The electromagnetic component (200) includes: Armature (210); Tail (220), one end face of which is provided with an axially extending receiving hole (221), and the armature (210) is movably installed in the receiving hole (221); A front valve (230) is fixed to the tail valve (220), the front valve (230) is configured to block the receiving hole (221), and the front valve (230) is connected to the main valve portion (100); A push rod (260) passes through the front valve (230), one end of which is connected to the armature (210). The push rod (260) can drive the main valve core (120) to block the first opening (1) and the second opening (2); and A coil assembly (240) is disposed on the outer periphery of the tail (220) and is configured to drive the armature (210) to move within the receiving hole (221).

7. The normally closed pilot-operated solenoid valve according to claim 6, characterized in that, The electromagnetic part (200) also includes: The second elastic element (250) is disposed in the receiving hole (221), and the two ends of the second elastic element (250) abut against the armature (210) and the hole wall of the receiving hole (221) away from the front (230), respectively.

8. The normally closed pilot-operated solenoid valve according to claim 6, characterized in that, The electromagnetic part (200) also includes: A third elastic element (270) is disposed in the receiving hole (221), and the two ends of the third elastic element (270) abut against the armature (210) and the fore-end (230) respectively.

9. The normally closed pilot-operated solenoid valve according to claim 6, characterized in that, The electromagnetic part (200) also includes: A magnetic shielding ring (280) is disposed between the front ferrule (230) and the tail ferrule (220).

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