A valve core and a hydraulic valve including the valve core

Abstract

The present disclosure relates to a valve core and a hydraulic valve including the valve core, belonging to the technical field of hydraulic valves, wherein a first annular groove, a second annular groove and a third annular groove are arranged on the outer surface of the valve core; a first axial groove and a second axial groove are arranged on the surface of the valve core along the axial direction and in a circular array; the first axial groove is connected to the first annular groove; the second axial groove is connected to the second annular groove; a first radial hole, a second radial hole and a third radial hole are arranged in the radial direction of the valve core; the first radial hole is connected to the first annular groove; the third radial hole is communicated with the third annular groove, the first radial hole is connected to the third radial hole through the axial hole, and the center hole of the valve body is connected to the second annular groove through the second radial hole; the valve core is rotatably arranged in the valve body, and the hydraulic valve can realize high-frequency opening and closing control, which solves the complexity and difficulty of high-frequency opening and closing axial motion control of the sliding valve.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of hydraulic valves, and in particular relates to a valve core and a hydraulic valve including the valve core. Background Art

[0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

[0003] At present, the rotary valve cuts off the oil circuit by rotating the valve core, realizing the joint action of the left and right rotary cylinders; but the speed is low (0.25r / s), and the valve core and the housing have a small clearance fit; if the speed is high, it will cause direct rotation friction between the valve core and the housing, oil film lubrication problems, and dynamic balance problems. The above three aspects limit the high-speed operation of the rotary valve. The axial movement of the ordinary reversing valve (sliding valve) realizes the closure of the oil circuit. The reversing frequency of the reversing valve used in the hydraulic pipeline or cylinder pulse test is 1Hz, and the reversing efficiency is low. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present disclosure provides a valve core and a hydraulic valve including the valve core.

[0005] At least one embodiment of the present disclosure discloses a valve core, wherein a first annular oil groove, a second annular oil groove and a third annular oil groove are arranged at intervals on the outer surface of the valve core; a first axial groove and a second axial groove are arranged on the surface of the valve core along the axial direction and in a circular array; the first axial groove is connected to the first annular groove; the second axial groove is connected to the second annular groove; a first radial hole, a second radial hole, a third radial hole and a fourth radial hole are arranged in the radial direction of the valve core; the first radial hole is connected to the first annular groove; the third radial hole is connected to the third annular groove, the first radial hole is connected to the third radial hole through the axial hole, the center hole of the valve body is connected to the second annular groove through the second radial hole, and is connected to the outer surface of the valve core through the fourth radial hole.

[0006] As a preferred solution, the first axial groove and the second axial groove are staggeredly distributed in the axial direction of the valve core.

[0007] As a preferred solution, a process plug is provided at one end of the axial hole.

[0008] At least one embodiment of the present disclosure also discloses a hydraulic valve, which includes a valve body and a valve core as described in any one of the above items; the valve core is rotatably arranged in the valve body; an oil inlet, a first oil outlet, a second oil outlet and a third oil outlet are provided on the outer surface of the valve body; the oil inlet is connected to the first annular groove; the centers of the first oil outlet and the second oil outlet are located on the same cross-section perpendicular to the axis of the valve core, and the cross-section has a first axial oil groove and a second axial oil groove; the third oil outlet is connected to the second annular groove.

[0009] As a preferred solution, both ends of the valve core in the axial direction are fixed in the valve body through a first bearing and a second bearing respectively.

[0010] As a preferred solution, one end of the valve body in the length direction is provided with a first end cover for fixing the first bearing; the other end is fixed to the second bearing through a second end cover; a retaining ring is provided between the second end cover and the second bearing; and a rotation seal is provided between the second end cover and the valve core.

[0011] As a preferred solution, the second end cover is connected to a driving motor, and a rotating shaft of the driving motor passes through the second end cover and is connected to the valve core.

[0012] The beneficial effects disclosed in the above embodiments are:

[0013] (1) The hydraulic oil in the valve core of the present invention can enter from the first annular groove and be divided into two paths. One part passes through the radial hole on the annular groove and the internal axial hole and flows out from the third annular groove, which plays a lubricating role in the rotation of the valve core. At the same time, the second part can flow out from the second annular groove through the internal center hole and the internal radial hole to realize the circulation of the oil circuit.

[0014] (2) The hydraulic valve disclosed in the present invention can realize high-frequency opening and closing control, which solves the complexity and difficulty of high-frequency opening and closing axial motion control of the slide valve;

[0015] (3) The rotary valve core and the valve body of the hydraulic valve disclosed in the present invention are connected via a bearing, thereby solving the friction problem between the high-frequency axial movement of the sliding valve or the rotary movement of the rotary valve core and the housing.

[0016] (4) The hydraulic valve bearing disclosed in the present invention is lubricated by leakage of pressure oil. At the same time, the pressure oil forms a lubricating oil film between the rotating valve core and the valve body. The pressure oil in the axial groove and the pressure oil in the annular channel can play a role in static pressure bearing balance support for the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure.

[0018] Figure 1 A structural diagram of a hydraulic valve is provided for an embodiment of the present disclosure;

[0019] Figure 2 A structural diagram of a valve core in a hydraulic valve is provided for an embodiment of the present disclosure;

[0020] Figure 3 Provide a cross-sectional view of the hydraulic valve in the longitudinal direction for an embodiment of the present disclosure;

[0021] Figure 4 Provide a horizontal cross-sectional view of a hydraulic valve for an embodiment of the present disclosure;

[0022] Figure 5 A working principle diagram of a hydraulic valve is provided for an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used in the present disclosure have the same meanings as those commonly understood by those skilled in the art to which the present disclosure belongs.

[0024] In the description of the present disclosure, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0025] like Figure 1-Figure 3 As shown, the hydraulic valve disclosed in this embodiment mainly includes a valve body 2 and a valve core 1 arranged inside, and the two ends of the valve core in the length direction are connected by a bearing 3 respectively, and the two ends of the valve body are provided with a left end cover 10 and a right end cover 8, wherein the left end cover 10 of the valve body is used to fix the left bearing, and a first static seal 11 is provided between the left end cover and the left bearing, and the right end cover 8 of the valve body is used to fix the right bearing, and a second static seal 4 is also provided between the right end cover and the right bearing, so that the valve core can rotate in the valve body.

[0026] In order to realize the rotation of the valve core, the right end cover in this embodiment is connected to the drive motor 6 through a motor support. It can be understood that the motor support is fixed to the right end cover by bolts, and the output shaft of the drive motor 6 passes through the right end cover and is connected to the valve core 1.

[0027] like Figure 2 As shown, the valve core 1 in this embodiment is provided with a first annular oil groove 101, a second annular oil groove 103 and a third annular oil groove 105 from left to right in the length direction, and the three annular grooves are arranged at intervals, wherein the widths of the first annular oil groove 101 and the second annular oil groove 103 are the same, and the width of the third annular oil groove 105 is smaller than that of the first annular oil groove 101 and the second annular oil groove 103, and a plurality of first axial oil grooves 102 and second axial oil grooves 104 are uniformly arranged on the surface of the valve core between the first annular oil groove 101 and the second annular oil groove 103, and these axial oil grooves are arranged on the outer surface of the valve core in a circumferential array. The first axial oil grooves 102 and the second axial oil grooves 104 are not limited to 3, and can be 2 or more, but must be evenly distributed.

[0028] It should be noted that, Figure 2As shown, the first axial oil groove 102 and the second axial oil groove 104 extend in opposite directions and the same distance, and on a longitudinal section in the middle of the valve core perpendicular to the axis of the valve core, there are both the first axial oil groove 102 and the second axial oil groove 104 in the circumferential direction of the section.

[0029] Furthermore, the first axial oil groove 102 is connected to the first annular oil groove 101, and the second axial oil groove 104 is connected to the second annular oil groove 103. Figure 1 and Figure 4 As shown, the valve core is provided with a central oil hole 107, which does not penetrate the two end faces of the valve core in the length direction, but starts from the left end face, penetrates into the interior, is connected to the second annular oil groove 103 through the second radial hole 108, and then is connected to the outside of the valve core through the fourth radial hole 110.

[0030] Further, if Figure 3-Figure 4 As shown, in this embodiment, a first radial hole 106, a second radial hole 108 and a third radial hole 109 are provided in the radial direction inside the valve core, wherein the first radial hole 106 is connected to the first annular oil groove 102, the second radial hole 108 is connected to the second annular oil groove 102, and the third radial hole 109 is connected to the third annular oil groove 103.

[0031] An axial hole 111 is also provided in the valve core; the first radial hole 106 is connected to the third radial hole 109 through the axial hole 111, and the axial hole 110 is parallel to the internal center hole 107, and a process plug 7 is provided on the axial hole 110 to prevent the hydraulic oil flowing into the axial hole 111 from flowing out.

[0032] The valve body 2 is provided with four oil ports, namely, P, T, A and B, wherein the P port is interconnected with the first annular oil passage 101 in the rotating valve core 1, and the T port is interconnected with the second annular oil passage 103 in the rotating valve core 1; the A and B ports are distributed on the valve body 2 at a certain angle, that is, their distribution angle = 360 / (the number of axial oil grooves 102 + the number of axial oil grooves 104), and the centers of the A and B ports are on the same cross section perpendicular to the axis of the valve core, and the cross section has the axial oil groove 102 and the axial oil groove 104, that is, no matter whether it is the first axial oil groove or the second axial oil groove, when the valve core rotates, A or B will have the axial oil groove connected.

[0033] The specific working principle of the above hydraulic valve:

[0034] like Figure 3-Figure 4As shown, the pressure oil enters the first annular oil groove 101 and the first axial oil groove 102 through the P port of the valve body 2; part of the pressure oil enters the third annular oil passage 105 through the first radial hole 106, the axial hole 111, and the radial hole 109; the pressure oil in the third annular oil passage 105 forms static pressure support, and at the same time leaks through the matching clearance between the valve body 2 and the rotating valve core 1 to the second annular oil passage 103, the space between the bearing 3 and the rotating seal 5, on the one hand, forming a lubricating oil film between the rotating valve core 1 and the valve body 2, and on the other hand, providing lubrication for the bearing 3. At the same time, the pressure oil in the first annular oil groove 101 leaks through the matching clearance between the rotating valve core 1 and the valve body 2 to flow to the left bearing to provide lubrication. The lubricating oil leaked from the left bearing returns to the oil tank through the center hole 107, the second radial hole 108, the second annular oil groove 103, and the valve body T port. The lubricating oil leaking between the right bearing and the rotary seal 5 returns to the oil tank through the fourth radial hole 110, the center hole 107, the second radial hole 108, the second annular oil passage 103, and the valve body T port, so as to avoid the high pressure phenomenon caused by the trapped oil of the lubricating oil leaking from the bearings on both sides.

[0035] Specifically, Figure 5 As shown, when the driving device 6 connected to the valve body drives the rotary valve core 1 to rotate a certain angle (as shown in the left figure), the pressure oil passes through the valve body P port, the first annular oil passage 101 of the rotary valve core 1, and the first axial oil groove 102 to the valve body A port, forming a P-A interconnection; at this time, the valve body B port passes through the second axial oil groove 104 of the rotary valve core 1 and the second annular oil passage 103 to the valve body T port, forming a B-T interconnection;

[0036] When the driving device 6 drives the rotary valve core 1 to rotate a certain angle (as shown in the middle position diagram), the pressure oil forms a block through the valve body P port, the first annular oil passage 101 of the rotary valve core 1, and the first axial oil groove 102, resulting in P and A not being able to communicate with each other; at the same time, the valve body T port, the rotary valve core 1, the second annular oil passage 103, and the second axial oil groove 104 form a block, resulting in B and T not being able to communicate with each other;

[0037] When the driving device 6 drives the rotary valve core 1 to rotate a certain angle (as shown in the right figure), the pressure oil passes through the valve body P port, the first annular oil passage 101 of the rotary valve core 1, and the axial oil groove 102 to the valve body B port, forming a P-B interconnection; at this time, the valve body A port passes through the axial oil groove 104 of the rotary valve core 1 and the annular oil passage 103 to the valve body T port, forming a A-T interconnection;

[0038] It can be seen from the figure that when the rotary valve core 1 rotates one circle, P / A will be connected n times (B / T will be connected n times) (n is the number of axial oil grooves 102), P / A will be cut off n times (B / T will be cut off n times), P / B will be connected n times (A / T will be connected n times) (n is the number of axial oil grooves 104), that is, the A / B port will output pressurized oil n times; when the rotation speed of the rotary valve core 1 is changed, the number of P / A / B / T on and off times can be changed, realizing high-frequency opening and closing, and the frequency is adjustable.

[0039] It can be seen from the figure that when the rotary valve core 1 rotates one circle, P / A will be connected n times (B / T will be connected n times) (n is the number of the first axial oil grooves 102), P / A will be cut off n times (B / T will be cut off n times), P / B will be connected n times (A / T will be connected n times) (n is the number of the second axial oil grooves 104), that is, the A / B port will output pressurized oil n times; when the rotation speed of the rotary valve core 1 is changed, the number of P / A / B / T on and off times can be changed, so as to achieve high-frequency opening and closing, and the frequency is adjustable.

[0040] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A valve core, characterized in that: A first annular oil groove, a second annular oil groove and a third annular oil groove are arranged at intervals on the outer surface of the valve core; a first axial groove and a second axial groove are arranged on the surface of the valve core along the axial direction and in a circular array; the first axial groove is connected to the first annular groove; the second axial groove is connected to the second annular groove; a first radial hole, a second radial hole, a third radial hole and a fourth radial hole are arranged in the radial direction of the valve core; the first radial hole is connected to the first annular groove; the third radial hole is connected to the third annular groove, the first radial hole is connected to the third radial hole through the axial hole, the center hole of the valve body is connected to the second annular groove through the second radial hole, and is connected to the outer surface of the valve core through the fourth radial hole.

2. A valve core according to claim 1, characterized in that: The first axial groove and the second axial groove are alternately distributed in the circumferential direction of the valve core.

3. A valve core according to claim 1, characterized in that: A process plug is provided at one end of the axial hole.

4. A hydraulic valve, characterized in that: It comprises a valve body and a valve core as described in any one of claims 1 to 3 above; the valve core is rotatably arranged in the valve body; an oil inlet, a first oil outlet, a second oil outlet and a third oil outlet are arranged on the outer surface of the valve body; the oil inlet is connected to the first annular groove; the centers of the first oil outlet and the second oil outlet are located on the same cross section perpendicular to the axis of the valve core, and the cross section has a first axial oil groove and a second axial oil groove; the third oil outlet is connected to the second annular groove.

5. A hydraulic valve according to claim 4, characterized in that: Both ends of the valve core in the axial direction are fixed in the valve body through a first bearing and a second bearing respectively.

6. A hydraulic valve according to claim 5, characterized in that: One end of the valve body in the length direction is fixed to the first bearing through a first end cover; the other end is fixed to the second bearing through a second end cover; a retaining ring is provided between the second end cover and the second bearing; and a rotation seal is provided between the second end cover and the valve core.

7. A hydraulic valve according to claim 6, characterized in that: The second end cover is connected to a driving motor, and a rotating shaft of the driving motor passes through the second end cover and is connected to the valve core.

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