A self-compensating leaky on-off digital valve

Abstract

The application discloses a kind of digital valve of leakage self-compensation bidirectional opening and closing, belong to digital valve field;Digital valve includes: mutually fixed bonnet and valve seat, coil is equipped in bonnet, the center of coil framework is fixedly connected with armature, valve seat is fixedly connected with valve sleeve, the center of valve sleeve is slidably fitted with stepped valve core rod, reset spring is equipped between the left end of stepped valve core rod and armature, right end is equipped with valve core cone, the inner hole of valve seat is fixed with base, and valve core cone can seal the passage in base;Circular ring and magnetic conducting ring are equipped between the left end of stepped valve core rod and coil framework, circular ring is fixed with stepped valve core rod, three groups of magnetic conducting ring flow channels are opened in magnetic conducting ring, three groups of valve sleeve flow channel are opened on valve sleeve, base is opened with three flow channels, and each group of valve sleeve flow channel and magnetic conducting ring flow channel and flow channel on base correspondingly constitute a flow channel;By controlling the on-off electricity of coil, oil can be discharged from first oil outlet channel and second oil outlet channel respectively.

Description

A leak-compensating, bidirectional opening and closing digital valve Technical Field

[0001] This invention belongs to the field of digital valves, specifically relating to a leakage-self-compensating bidirectional opening and closing digital valve. Background Technology

[0002] Digital valves employ PWM control, easily integrating fluid control technology with computer technology. They directly receive digital pulse signals to open and close the valve ports, making them widely used in the engineering machinery industry with broad application prospects and significant economic and social benefits. However, most existing digital valves have only one working port, controlling only one load port, failing to meet the system's requirement of simultaneously controlling two load ports. This results in a large number of hydraulic valves in the hydraulic system, making the system overly complex and reducing the reliability of the hydraulic control system. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a leakage-self-compensating bidirectional opening and closing digital valve, which solves the problems in the prior art.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A leakage-compensating bidirectional opening and closing digital valve includes a valve cap and a valve seat fixed to each other. A coil frame is fixed inside the valve cap, and a coil is wound on the coil frame. An armature is fixedly connected to the center of the coil frame. A valve sleeve is fixedly connected inside the valve seat. A stepped valve core rod is slidably fitted to the center of the valve sleeve. A return spring is provided between the left end of the stepped valve core rod and the armature. A valve core cone is provided at the right end of the stepped valve core rod. A base is fixed in the inner hole of the valve seat. The valve core cone can seal the channel inside the base.

[0006] A circular ring and a magnetic ring are provided between the left end of the stepped valve core rod and the coil frame. The circular ring is fixed to the stepped valve core rod. Three sets of magnetic ring flow channels are opened inside the magnetic ring and are distributed in a 120° annular array. Three sets of valve sleeve flow channels are opened on the valve sleeve and correspond to the angle of the magnetic ring flow channels. Three flow channels are opened on the base and are distributed in a 120° annular array. Each set of valve sleeve flow channels, magnetic ring flow channels and flow channels on the base correspond to the angle of the flow channels and together form a flow channel.

[0007] The valve seat is equipped with an oil inlet channel, a first oil outlet channel, and a second oil outlet channel; by controlling the on and off of the control coil, oil can be discharged from the first oil outlet channel and the second oil outlet channel respectively.

[0008] Furthermore, an adjusting spring is provided between the stepped valve core rod and the valve core cone to achieve an elastic connection.

[0009] Furthermore, the valve seat has an internal thread in its inner hole, which engages with the external thread on the base.

[0010] Furthermore, the right end face of the magnetic ring and the right end face of the valve cap are on the same plane.

[0011] Furthermore, the annular component is provided with an internal thread, which engages with the external thread at the left end of the stepped valve core rod.

[0012] Furthermore, one end of the valve cap has an external hexagonal structure, and the other end has a cylindrical structure. The side of the valve cap has a slot for the coil lead, and the outer cylindrical surface of the valve seat has external threads.

[0013] Furthermore, a first sealing ring is installed between the right stepped surface of the coil frame and the left stepped surface of the valve seat, and a second sealing ring is installed between the right end face of the magnetic ring and the left end face of the valve sleeve; a third, a fifth, and a sixth sealing ring are installed on the outer cylindrical surface of the valve seat, a fourth and a seventh sealing ring are installed between the outer cylindrical surface of the valve sleeve and the inner cylindrical surface of the valve seat, an eighth sealing ring is installed between the right end face of the valve sleeve and the left end face of the base, and a ninth sealing ring is installed on the right end face of the valve seat.

[0014] Furthermore, the valve cap, stepped valve core rod, and annular component are all made of soft magnetic material.

[0015] Furthermore, the inner hole at the left end of the valve seat is fixed in place with the valve sleeve.

[0016] Furthermore, the outer cylindrical surface at the right end of the coil frame and the inner cylindrical surface at the right end of the valve cap form an annular hole, and the step at the left end of the valve seat is fixed in conjunction with this annular hole.

[0017] The beneficial effects of this invention are:

[0018] 1. By setting an adjusting spring between the stepped valve core rod and the valve core cone, the sealing degree between the valve core cone and the base is adjusted, thereby achieving the purpose of self-adjustment compensation for leakage after wear, so as to alleviate the problem of leakage caused by wear after continuous operation and frequent opening and closing.

[0019] 2. The left end of the stepped valve core rod is threaded into the ring component. When the coil is energized, the armature attracts the valve core rod and the ring component, resulting in a faster response.

[0020] 3. The electromagnetic force can be adjusted by changing the size of the air gap through the screw-fit base. Different gaps correspond to different electromagnetic characteristics, thereby indirectly adjusting the dynamic and static characteristics of the digital valve.

[0021] 4. When not powered, the second oil outlet remains open while the first oil outlet remains closed. When powered, the second oil outlet closes while the first oil outlet opens, coordinating the opening and closing states of the two outlets to meet different operating conditions. The left end of the valve core uses a face seal, and the right end of the valve core cone and the base use a cone seal, thus meeting the sealing requirements for different oil port activation conditions. Most existing digital valves have only one working oil port, which can only control one load port and cannot meet the system's requirement of simultaneously controlling two load ports. The proposed digital valve is essentially a two-position three-way valve. Compared to a two-position two-way valve, it can reduce the number of solenoid valves in the hydraulic system, thereby reducing costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a schematic diagram of the overall structure of the digital valve of the present invention;

[0024] Figure 2 is a simplified cross-sectional view of the overall structure of the digital valve in its normal position according to the present invention;

[0025] Figure 3 is a simplified cross-sectional view of the overall structure of the digital valve electromagnet of the present invention in its working state.

[0026] Figure 4 is a graphic symbol for the digital valve of this invention.

[0027] Among them, 1-valve cap; 2-coil frame; 3-armature; 4-coil; 5-reset spring; 6-magnetic ring; 7-first sealing ring; 8-stepped valve core rod; 9-second sealing ring; 10-third sealing ring; 11-fourth sealing ring; 12-valve seat; 13-fifth sealing ring; 14-valve sleeve; 15-sixth sealing ring; 16-seventh sealing ring; 17-eighth sealing ring; 18-valve core cone; 19-base; 20-oil inlet channel; 21-adjusting spring; 22-ninth sealing ring; 23-first oil outlet channel; 24-second oil outlet channel; 25-valve sleeve flow channel; 26-magnetic ring flow channel; 27-ring component. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] As shown in Figures 1 to 3, a leakage self-compensating bidirectional opening and closing digital valve includes a valve cap 1, a valve seat 12 fixedly connected to one side of the valve cap 1, a coil frame 2 fixedly connected inside the valve cap 1, a coil 4 wound on the coil frame 2, an armature 3 fixedly connected to the center of the coil frame 2, a valve sleeve 14 fixedly connected inside the valve seat 12, a valve core slidably fitted at the center of the valve sleeve 14, the valve core including a stepped valve core rod 8, a return spring 5 provided between the left end of the stepped valve core rod 8 and the armature 3;

[0031] The valve core is provided with a valve core cone 18 at the right end, and an adjusting spring 21 is provided between the stepped valve core rod 8 and the valve core cone 18 to achieve elastic connection; a base 19 is threadedly connected in the inner hole of the valve seat 12. Under the elastic force of the adjusting spring 21, the valve core cone 18 can match the channel in the base 19 to form a seal. The valve seat 12 is provided with an oil inlet channel 20, a first oil outlet channel 23 and a second oil outlet channel 24.

[0032] The outer cylindrical surface of the left end of the stepped valve core rod 8 and the inner cylindrical surface of the coil frame 2 form an annular hole. An annular component 27 and a magnetic ring 6 are disposed within the annular hole. The annular component 27 has an internal thread that engages with the external thread of the left end of the stepped valve core rod 8. The right end face of the magnetic ring 6 is on the same plane as the right end face of the valve cap 1. Three sets of magnetic ring flow channels 26 are formed within the magnetic ring 6, arranged in a 120° annular array.

[0033] The valve sleeve 14 has three sets of oil outlet holes and valve sleeve flow channels 25, each set is arranged in a 120° annular array, and the three sets of valve sleeve flow channels 25 correspond to the three sets of magnetic ring flow channels 26 at the same angle; the base has three flow channels arranged in a 120° annular array, and the valve sleeve flow channel 25, magnetic ring flow channel 26 and flow channel on the base at the same angle correspond to each other to form a flow channel. When the coil is not energized, oil enters through this flow channel.

[0034] As shown in Figure 2, when coil 4 is de-energized, due to the absence of electromagnetic force, the valve core, composed of stepped valve core rod 8 and valve core cone 18, moves axially from left to right under the restoring elasticity of return spring 5. This causes the conical surface of valve core cone 18 at the right end of the valve core to contact the left end channel of base 19, resulting in a sealed state. The first oil outlet channel 23 is closed, while the step at the left end of the valve core is not in contact with the right end face of magnetic ring 6, resulting in an open state. The second oil outlet channel 24 is open, and the oil can only flow through the flow channel of base 19, the valve sleeve flow channel 25 of valve sleeve 14, and the magnetic ring flow channel 26 of magnetic ring 6, ultimately reaching the second oil outlet channel 24. The oil path is shown as PB in Figure 2.

[0035] As shown in Figure 3, when the coil 4 is energized, the left end of the stepped valve core rod 8 is threaded into the ring 27 and attracted by the armature 3. The valve core and the ring 27 move axially from right to left, compressing the return spring 5. The left end step of the valve core contacts the right end face of the magnetic ring 6 to form a surface seal, and the second oil outlet channel 24 is closed. At the same time, the valve core cone 18 at the right end of the valve core and the channel seal of the base 19 are opened, and the first oil outlet channel 23 is open. Oil can enter from the middle flow channel of the base 19 and be discharged from the first oil outlet channel 23. The oil path is PA in Figure 3.

[0036] In this embodiment, one end of the valve cap 1 has an external hexagonal structure for easy disassembly; the other end has a cylindrical structure. The side of the valve cap 1 has a slot for the coil 4 lead wire. The outer cylindrical surface of the valve seat 12 has external threads for easy installation with the valve block.

[0037] The inner hole at the left end of the valve seat 12 is fixedly connected to the valve sleeve 14, and the internal threaded hole at the right end of the valve seat 12 is threadedly engaged with the base 19. The outer cylindrical surface at the right end of the coil frame 2 and the inner cylindrical surface at the right end of the valve cap 1 form an annular hole, and the step at the left end of the valve seat 12 is fixedly connected to this annular hole.

[0038] In this embodiment, a first sealing ring 7 is installed between the right stepped surface of the coil frame 2 and the left stepped surface of the valve seat 12, and a second sealing ring 9 is installed between the right end face of the magnetic ring 6 and the left end face of the valve sleeve 14; a third sealing ring 10, a fifth sealing ring 13 and a sixth sealing ring 15 are installed on the outer cylindrical surface of the valve seat 12, a fourth sealing ring 11 and a seventh sealing ring 16 are installed between the outer cylindrical surface of the valve sleeve 14 and the inner cylindrical surface of the valve seat 12, an eighth sealing ring 17 is installed between the right end face of the valve sleeve 14 and the left end face of the base 19, and a ninth sealing ring 22 is installed on the right end face of the valve seat 12;

[0039] Among them, the first sealing ring 7 and the second sealing ring 9 prevent oil leakage when the second oil outlet channel 24 is opened; the third sealing ring 10, the fifth sealing ring 13 and the sixth sealing ring 15 prevent oil leakage when different oil outlet channels are opened after the digital valve is connected to the valve block; the fourth sealing ring 11 and the seventh sealing ring 16 maintain the seal between the valve sleeve 14 and the valve seat 12; the eighth sealing ring 17 isolates the oil leakage in the normal flow channel and the working flow channel of the digital valve; and the ninth sealing ring 22 prevents oil leakage at the oil inlet channel 20 after the digital valve is installed with the valve block.

[0040] It should be noted that in this embodiment, the valve cap 1, the stepped valve core rod 8, and the annular component 27 are all made of soft magnetic materials, forming a closed electromagnetic circuit.

[0041] The left end face of the stepped valve core rod 8, which is threaded into the ring part 27, is attracted by the armature 3, resulting in a larger magnetic circuit area and a faster response of the valve core.

[0042] In addition, in order to solve the problem of oil leakage caused by the wear of the valve core cone 18 and the base 19 at the contact point of the valve core cone 18 due to frequent opening and closing of the valve core during long-term operation, an adjusting spring 21 is provided between the stepped valve core rod 8 and the valve core cone 18 in this embodiment. The adjusting spring 21 adjusts the contact position of the valve core cone 18 and the middle channel of the base 19 under the elastic action, so as to re-form a complete cone seal state and achieve the purpose of self-compensation for leakage after wear.

[0043] It is worth mentioning that the internal threaded hole at the right end of the valve seat 12 is threadedly engaged with the base 19. By engaging the thread, the position of the base 19 is changed, and the air gap distance between the left end face of the stepped valve core rod 8 and the right end face of the armature 3 is adjusted, thereby changing the magnitude of the electromagnetic force. Different gaps correspond to different electromagnetic characteristics, thereby indirectly adjusting the dynamic and static characteristics of the digital valve.

[0044] As shown in Figure 4, when coil 4 is energized, the left end of the graphic symbol is working, port P is connected to port A, and oil inlet channel 20 is connected to the first oil outlet channel 23; when coil 4 is not energized, under the action of reset spring 5, the right end of the graphic symbol is working, port P is connected to port B, and oil inlet channel 20 is connected to the second oil outlet channel 24.

[0045] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A leakage-self-compensating bidirectional opening and closing digital valve, comprising a valve cap (1) and a valve seat (12) fixed to each other, characterized in that, A coil frame (2) is fixed inside the valve cap (1), and a coil (4) is wound on the coil frame (2). An armature (3) is fixedly connected to the center of the coil frame (2). A valve sleeve (14) is fixedly connected inside the valve seat (12). A stepped valve core rod (8) is slidably fitted to the center of the valve sleeve (14). A return spring (5) is provided between the left end of the stepped valve core rod (8) and the armature (3). A valve core cone (18) is provided at the right end of the stepped valve core rod (8). A base (19) is fixed in the inner hole of the valve seat (12). The valve core cone (18) can seal the middle channel inside the base (19). A circular ring (27) and a magnetic ring (6) are provided between the left end and the coil frame (2). The circular ring (27) is fixed to the stepped valve core rod (8). Three sets of magnetic ring flow channels (26) are opened in the magnetic ring (6) and are arranged in a 120° annular array. Three sets of valve sleeve flow channels (25) are opened on the valve sleeve (14) and correspond to the angle of the magnetic ring flow channel (26). Three flow channels are opened on the base and are arranged in a 120° annular array. Each set of valve sleeve flow channels (25) corresponds to the angle of the magnetic ring flow channel (26) and the flow channel on the base to form a flow channel. An oil inlet channel (20) and a first oil outlet channel are provided in the valve seat (12). There is a gap between the right end of the base (19) and the valve seat (12) in the first oil outlet channel (23) and the second oil outlet channel (24), so that the three flow channels distributed in a ring array on the base (19) are in fluid communication with the oil inlet channel on the valve seat (12); by controlling the on and off of the control coil (4), the oil can be discharged from the first oil outlet channel (23) and the second oil outlet channel (24) respectively; an adjusting spring (21) is provided between the stepped valve core rod (8) and the valve core cone (18) to achieve elastic connection; when the coil (4) is de-energized, since there is no electromagnetic force, the stepped valve core rod (8) and the valve core cone (18) form a free flow path. Under the restoring deformation elasticity of the return spring (5), the valve core moves from left to right along the axial direction, so that the conical surface of the valve core cone (18) at the right end of the valve core contacts the middle channel of the base (19) and is in a sealed state. The first oil outlet channel (23) is in a closed state, the step at the left end of the valve core does not contact the right end face of the magnetic ring (6) and is in an open state, and the second oil outlet channel (24) is in an open state. The oil can only pass through the flow channels distributed in the annular array on the base (19), the valve sleeve flow channel (25) of the valve sleeve (14) and the magnetic ring flow channel (26) of the magnetic ring (6), and finally reach the second oil outlet channel (24).When the coil (4) is energized, the left end of the stepped valve core rod (8) is threaded into the ring (27) and attracted by the armature (3). The valve core and the ring (27) move axially from right to left, compressing the return spring (5). The left end step of the valve core contacts the right end face of the magnetic ring (6) to form a surface seal, and the second oil outlet channel (24) is closed. At the same time, the valve core cone (18) at the right end of the valve core and the middle channel of the base (19) are sealed open, and the first oil outlet channel (23) is open. Oil can enter from the middle channel of the base (19) and be discharged from the first oil outlet channel (23).

2. The digital valve with self-compensating leakage and bidirectional opening and closing according to claim 1, characterized in that, The valve seat (12) has an internal thread in its inner hole, which cooperates with the external thread on the base (19).

3. The digital valve with self-compensating leakage and bidirectional opening and closing according to claim 1, characterized in that, The right end face of the magnetic ring (6) is on the same plane as the right end face of the valve cap (1).

4. The digital valve with self-compensating leakage and bidirectional opening and closing according to claim 1, characterized in that, The annular component (27) is provided with an internal thread, which cooperates with the external thread at the left end of the stepped valve core rod (8).

5. A leakage-self-compensating bidirectional opening and closing digital valve according to claim 1, characterized in that, The valve cap (1) has an external hexagonal structure at one end and a cylindrical structure at the other end. The valve cap (1) has a slot on its side for the lead wire of the coil (4). The outer cylindrical surface of the valve seat (12) has an external thread.

6. The digital valve with self-compensating leakage and bidirectional opening and closing according to claim 1, characterized in that, A first sealing ring (7) is installed between the right step surface of the coil frame (2) and the left step surface of the valve seat (12), and a second sealing ring (9) is installed between the right end face of the magnetic ring (6) and the left end face of the valve sleeve (14); a third sealing ring (10), a fifth sealing ring (13) and a sixth sealing ring (15) are installed on the outer cylindrical surface of the valve seat (12), a fourth sealing ring (11) and a seventh sealing ring (16) are installed between the outer cylindrical surface of the valve sleeve (14) and the inner cylindrical surface of the valve seat (12), an eighth sealing ring (17) is installed between the right end face of the valve sleeve (14) and the left end face of the base (19), and a ninth sealing ring (22) is installed on the right end face of the valve seat (12).

7. A leakage-self-compensating bidirectional opening and closing digital valve according to claim 1, characterized in that, The valve cap (1), the stepped valve core rod (8), and the ring (27) are all made of soft magnetic material.

8. A leakage-self-compensating bidirectional opening and closing digital valve according to claim 1, characterized in that, The inner hole at the left end of the valve seat (12) is fixed in conjunction with the valve sleeve (14).

9. A leakage-self-compensating bidirectional opening and closing digital valve according to claim 1, characterized in that, The outer cylindrical surface at the right end of the coil frame (2) and the inner cylindrical surface at the right end of the valve cap (1) form an annular hole, and the step at the left end of the valve seat (12) is fixed in conjunction with the annular hole.

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