A hydraulic valve spool and a hydraulic valve

Abstract

The present disclosure relates to a hydraulic valve spool and a hydraulic valve. The hydraulic valve spool includes: a spool body (1) having an axial stepped end face; a groove (2) provided on the axial stepped end face and extending inside the spool body (1); and an injection hole (3) formed in a side wall of the groove (2) on a side away from the axis of the spool body (1) and penetrating through the circumferential outer surface of the spool body (1).

Description

Technical Field

[0001] The present disclosure relates to the field of construction machinery, and particularly to a hydraulic valve spool and a hydraulic valve. Background Art

[0002] For a large-flow hydraulic valve, the control performance of the spool is mainly determined by the hydrodynamic force. Excessive hydrodynamic force may cause the spool commutation action to fail, and may also cause signal interference, resulting in disordered spool movement, affecting the stability and reliability of the hydraulic valve.

[0003] Methods in the industry to optimize the influence of the hydrodynamic force of the hydraulic valve spool on the hydraulic system mainly include redundant design to reduce the influence of the hydrodynamic force on the hydraulic system and designing a compensation structure on the spool to share the hydrodynamic force to reduce the influence on the hydraulic system, etc. Summary of the Invention

[0004] The inventors have found through research that in the related art, by designing a local compensation structure to share the hydrodynamic force, the hydrodynamic force cannot be truly reduced or eliminated, but only transferred or balanced, and commutation hydrodynamic force impact and commutation lag will still occur during transient operation.

[0005] In view of this, the embodiments of the present disclosure provide a hydraulic valve spool and a hydraulic valve, which can effectively reduce the hydrodynamic force of the hydraulic valve spool.

[0006] In one aspect of the present disclosure, a hydraulic valve spool is provided, including:

[0007] A spool body having an axial stepped end face;

[0008] A groove provided on the axial stepped end face and extending inside the spool body; and

[0009] A spray hole opened on the side wall of the groove away from the axis of the spool body and penetrating through the circumferential outer surface of the spool body.

[0010] In some embodiments, the cross-sectional area of the groove opening is larger than the cross-sectional area of the groove adjacent to the bottom of the groove.

[0011] In some embodiments, the angle range formed by the axis of the spray hole and the axis of the spool body includes 70° to 100°.

[0012] In some embodiments, the angle formed by the axis of the spray hole and the axis of the spool body is 90°.

[0013] In some embodiments, the spray hole includes a plurality of first holes with different cross-sectional dimensions.

[0014] In some embodiments, the cross-sectional area of the groove opening is larger than the cross-sectional area of the groove adjacent to the bottom of the groove;

[0015] Among them, the cross-sectional dimensions of the multiple first holes vary along the axis of the valve core body, and the cross-sectional dimension of the first hole among the multiple first holes that is closer to the notch of the groove is larger than the cross-sectional dimension of the first hole that is closer to the bottom of the groove.

[0016] In some embodiments, at least some of the multiple first holes are arranged at equal angles along the circumferential direction of the valve core body.

[0017] In some embodiments, the injection holes include multiple second holes with the same cross-sectional dimensions.

[0018] In some embodiments, the area of the cross-section of the notch of the groove is larger than the area of the cross-section of the groove adjacent to the bottom;

[0019] Among them, the number of the second holes among the multiple second holes that is closer to the notch of the groove is more than the number of the second holes that is closer to the bottom of the groove.

[0020] In some embodiments, the groove penetrates along the circumferential direction of the valve core body.

[0021] In some embodiments, the grooves are arranged at intervals along the circumferential direction of the valve core body.

[0022] In some embodiments, a conical surface is formed between the side of the groove away from the axis of the valve core body and the circumferential outer surface of the valve core body, and a cylindrical surface is formed between the side of the groove close to the axis of the valve core body and the axis of the valve core body.

[0023] In some embodiments, the groove and / or the valve core body are configured to be obtained by additive manufacturing.

[0024] In another aspect of the present disclosure, a hydraulic valve is provided, including a hydraulic valve core as described in any one of the above.

[0025] In some embodiments, the hydraulic valve further includes:

[0026] A valve body, the valve body includes a valve hole for the axial sliding of the hydraulic valve core;

[0027] Among them, the valve hole includes:

[0028] An oil inlet cavity, arranged on the side close to the notch of the groove; and

[0029] An oil return cavity, arranged on the side close to the bottom of the groove.

[0030] Therefore, according to the embodiments of the present disclosure, by providing a groove extending along the inner part of the valve core body on the stepped end face of the valve core body, and providing injection holes penetrating the circumferential outer surface of the valve core body on the side wall of the groove, the flow channel formed by the groove and the injection holes can converge and boost hydraulic oil, and form a relatively large jet angle, which can improve the micro-motion characteristics when the hydraulic valve is switched on and the fast response during subsequent switching, thereby reducing the hydraulic force during the movement of the valve core and avoiding the problem that the hydraulic force is too large during the switching of the hydraulic valve core, resulting in a decrease in the sluggish performance of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, where:

[0033] Figure 1 (a) is a schematic structural diagram of a hydraulic valve core according to some embodiments of the present disclosure;

[0034] Figure 1 (b) of Figure 1 is a cross-sectional view of (a) of

[0035] Figure 2 is a schematic diagram of the flow direction of hydraulic oil according to some embodiments of the hydraulic valve core of the present disclosure;

[0036] Figure 3 (a) is a schematic structural diagram of a hydraulic valve core according to some other embodiments of the present disclosure;

[0037] Figure 3 (b) of Figure 3 is a partial enlarged view of (a) of

[0038] Figure 4 (a) is a schematic diagram of the flow direction of hydraulic oil according to some other embodiments of the hydraulic valve core of the present disclosure;

[0039] Figure 4 (b) of Figure 4 is a partial enlarged view of (a) of

[0040] It should be understood that the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions, and numerical values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0042] The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements preceding the term cover the elements enumerated after the term, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0043] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices and have an intermediate device.

[0044] All terms used in the present disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be construed as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such herein.

[0045] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0046] In the related art, a local compensation structure is designed on the hydraulic valve spool to share the hydraulic force, but only transfers or balances the hydraulic force, and does not truly reduce or eliminate the hydraulic force. During transient operation, it will still cause commutation hydraulic force shock and commutation retardation, affecting the commutation performance of the hydraulic valve spool. Moreover, in the process of additive manufacturing of the hydraulic valve spool in the related art, the manufacturing cost is often high and the production efficiency is low, which is not conducive to mass production applications.

[0047] In view of this, embodiments of the present disclosure provide a hydraulic valve spool and a hydraulic valve. Refer to Figure 1 , in one aspect of the present disclosure, a hydraulic valve spool is provided, including a spool body 1, a groove 2, and a jet hole 3. The spool body 1 has an axial stepped end face, the groove 2 is arranged on the axial stepped end face and extends inside the spool body 1, and the jet hole 3 is opened on the side wall of the groove 2 away from the axis of the spool body 1 and penetrates through the circumferential outer surface of the spool body 1. The side wall of the groove 2 includes but is not limited to a straight line and a curve. The jet hole 3 includes but is not limited to a straight hole and an arc hole with a curved axis.

[0048] In this embodiment, by opening a groove 2 extending inside the spool body 1 on the stepped end face of the spool body 1 and opening a jet hole 3 penetrating through the circumferential outer surface of the spool body 1 on the side wall of the groove 2, the flow channel formed by the groove 2 and the jet hole 3 can converge and boost the hydraulic oil, and form a larger jet angle, which can improve the micro-motion characteristics when the hydraulic valve is commutated and opened and the rapid responsiveness during subsequent commutation, thereby reducing the hydrodynamic force during the movement of the spool and avoiding the problem that the hydrodynamic force is too large when the hydraulic valve spool is commutated, resulting in a reduction in the sluggish performance of the spool.

[0049] Refer to Figure 1 , in some embodiments, the cross-sectional area of the notch of the groove 2 is larger than the cross-sectional area of the groove 2 adjacent to the bottom of the groove. In this embodiment, by setting the groove 2 as a wedge-shaped structure with a large notch and a small bottom, the flow-through area of the flow channel gradually decreases along the axis of the spool body 1, so as to achieve the aggregation of the pressure of the hydraulic oil, increase the flow rate of the hydraulic oil, realize the rapid movement and precise control of the hydraulic valve spool, and also ensure the stability and reliability of the structural strength of the groove 2 and the jet hole 3. Wherein, the flow-through area is the accumulation of the circumferential projection areas of all the jet holes 3 after the spool moves.

[0050] Refer to Figure 2 , in some embodiments, the included angle formed by the axis of the jet hole 3 and the axis of the spool body 1 is angle A, and the angle range of angle A includes 70° to 100°. According to the hydrodynamic force formula for the commutation of the hydraulic valve spool, the magnitude of the hydrodynamic force during the commutation of the hydraulic valve spool is proportional to the cosine of the jet angle. In this embodiment, through the cooperation of the jet hole 3 and the groove 2, the jet angle formed by the axis of the jet hole 3 and the axis of the spool body 1 is effectively increased compared with the related art, which can reduce the hydrodynamic force during the movement of the hydraulic valve spool, ensure the commutation performance of the hydraulic valve spool, and thus realize the micro-motion characteristics when the hydraulic valve is commutated and opened and the rapid responsiveness during subsequent commutation, preventing the hydrodynamic force from being too large when the spool is commutated, resulting in a reduction in the sluggish performance of the spool.

[0051] Refer to Figure 2, in some embodiments, the angle A formed by the axis of the injection hole 3 and the axis of the spool body 1 is 90°. In this embodiment, the axis of the injection hole 3 is perpendicular to the axis of the spool body 1, so that the cosine of the jet angle can reach the minimum value of 0 when the hydraulic oil is reversed and injected, thereby eliminating the influence of the hydraulic force and making the commutation performance of the hydraulic valve spool reach the optimal state.

[0052] Reference Figure 1 , in some embodiments, the injection hole 3 includes a plurality of first holes 31 with different cross-sectional dimensions, where at least four first holes 31 with different cross-sectional sizes are included. In this embodiment, by providing a plurality of first holes 31 with different cross-sectional dimensions on the side wall of the groove 2 away from the axis of the spool body 1, the first holes 31 with a small cross-sectional size can enable the hydraulic valve spool to obtain a fine movement characteristic when the displacement is small, and the first holes 31 with a large cross-sectional size can enable the hydraulic valve spool to obtain a large flow area when the displacement is large. The plurality of first holes 31 with different cross-sectional dimensions cooperate with each other, which can improve the relationship between the spool displacement and the flow area, effectively improve the moving speed and commutation accuracy of the hydraulic valve spool, and achieve precise control of the movement of the hydraulic valve spool.

[0053] Reference Figure 1 , in some embodiments, the cross-sectional area of the notch of the groove 2 is larger than the cross-sectional area of the groove 2 adjacent to the bottom of the groove. The cross-sectional dimensions of the plurality of first holes 31 vary along the axis of the spool body 1, and the cross-sectional dimensions of the first holes 31 close to the notch of the groove 2 among the plurality of first holes 31 are larger than the cross-sectional dimensions of the first holes 31 close to the bottom of the groove 2.

[0054] In this embodiment, the cross-sectional dimensions of the plurality of first holes 31 vary along the axis of the spool body 1 in cooperation with the gradually shrinking wedge shape of the groove 2, which can better cooperate with the groove 2 to increase the flow rate of the hydraulic oil when passing through the bottom of the groove 2, prevent impurities from blocking the first holes 31 with a small cross-sectional size, ensure the moving speed of the spool, and achieve more precise control of the commutation of the hydraulic valve spool.

[0055] Reference Figure 1 , in some embodiments, at least some of the plurality of first holes 31 are arranged at equal angles along the circumferential direction of the spool body 1. In this embodiment, the first holes 31 are evenly distributed at equal angles on the outer surface of the spool body 1, which can make the hydraulic oil flow out evenly when the spool commutes, further improve the accuracy when the hydraulic valve spool commutes, the fine movement characteristic when the hydraulic valve commutes and opens, and the fast response when commuting subsequently.

[0056] Reference Figure 3, in some embodiments, the injection holes 3 include a plurality of second holes 32 with the same cross-sectional dimensions. In this embodiment, by arranging a plurality of second holes 32 with different cross-sectional dimensions on the side wall of the groove 2 away from the axis of the spool body 1, an ideal relationship between spool movement and flow area can be established, so that the flow area of the spool is relatively small when the spool displacement is small, and the flow area of the spool can increase rapidly when the spool displacement is large. Moreover, the accumulation of the plurality of second holes 21 makes the relationship curve between spool movement and flow area transition more slowly, thereby realizing precise control of the spool movement. And the arrangement mode of the second holes 32 on the outer surface of the spool body 1 can change according to the actual requirements for spool movement control, and the design of the flow area is not limited by the shape of traditional machining tools.

[0057] Reference Figure 3 , in some embodiments, the cross-sectional area of the notch of the groove 2 is larger than the cross-sectional area of the groove 2 adjacent to the bottom of the groove, and the number of the second holes 32 close to the notch of the groove 2 among the plurality of second holes 32 is more than the number of the second holes 32 close to the bottom of the groove 2. The plurality of second holes 32 include, but are not limited to, being arranged symmetrically about the axis center of the spool body 1.

[0058] In this embodiment, the second holes 32 are distributed in multiple layers in a concentrated manner, and the number of each layer changes along the axis of the spool body 1 in coordination with the gradually shrinking wedge shape of the groove 2, achieving better cooperation with the groove 2, making the transition of hydraulic oil in the flow channel slow, and thus enabling precise control of the reversing movement of the spool.

[0059] Reference Figure 1 , in some embodiments, the groove 2 penetrates along the circumferential direction of the spool body 1. In this embodiment, the circumferential arrangement form of the groove 2 can be set according to actual requirements to meet different relationships between flow area and spool movement. The groove 2 is opened to penetrate along the circumferential direction of the spool body 1, which can achieve a larger area of confluence of hydraulic oil and obtain a larger flow area when the displacement is large, improving the rapidity of the spool reversing of the hydraulic valve.

[0060] Reference Figure 3 , in some embodiments, the groove 2 is arranged at intervals along the circumferential direction of the spool body 1. In this embodiment, a plurality of the grooves 2 can be arranged at intervals along the circumferential direction of the spool body 1, which can improve the micro-movement performance of the spool reversing of the hydraulic valve to achieve more precise reversing control.

[0061] Reference Figure 1 , in some embodiments, a conical surface is formed between the side of the groove 2 away from the axis of the spool body 1 and the circumferential outer surface of the spool body 1, and a cylindrical surface is formed between the side of the groove 2 close to the axis of the spool body 1 and the axis of the spool body 1.

[0062] In this embodiment, the side of the groove 2 close to the axis of the valve core body 1 forms a cylindrical surface with the axis of the valve core body 1, and the side of the groove 2 far from the axis of the valve core body 1 forms a conical surface with the circumferential outer surface of the valve core body 1. Thus, while improving the commutation accuracy of the hydraulic valve core, the structural stability and reliability of both the groove 2 and the injection hole 3 can be satisfied simultaneously. Compared with the hydraulic components in the related art, the hydraulic valve core in this embodiment significantly reduces the manufacturing difficulty and is conducive to mass production and application.

[0063] In some embodiments, the groove 2 and / or the valve core body 1 are configured to be obtained by additive manufacturing. Hydraulic components such as hydraulic valve bodies and hydraulic valve cores in the related art often result in high manufacturing costs and low production efficiency, are not suitable for mass production by additive manufacturing, and limit the popularization and application of additive innovative design hydraulic components with excellent performance. The design of the hydraulic valve core in this embodiment effectively avoids the problem that cannot be achieved by traditional machining tools, reduces the manufacturing difficulty by means such as 3D printing, block manufacturing and subsequent connection, and is conducive to the mass production and rapid manufacturing of the hydraulic valve core.

[0064] On the other hand of the present disclosure, a hydraulic valve is provided, including the hydraulic valve core as described in any one of the above. In this embodiment, the hydraulic valve can avoid the problem of reduced spool sluggish performance caused by excessive hydrodynamic force in the related art, effectively improve the commutation accuracy of the hydraulic valve core, realize the free design of the spool displacement and flow area curve, and can be efficiently produced and applied by additive manufacturing.

[0065] Reference Figure 2 and Figure 4 , in some embodiments, the hydraulic valve further includes a valve body, the valve body includes a valve hole for the axial sliding of the hydraulic valve core, the valve hole includes an oil inlet cavity 41 and an oil return cavity 42, the oil inlet cavity 41 is arranged on the side close to the notch of the groove 2, and the oil return cavity 42 is arranged on the side close to the bottom of the groove 2. In this embodiment, the hydraulic oil flows into the groove 2 through the oil inlet cavity 41 and flows out from the injection hole 3 to reach the oil return cavity 42.

[0066] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0067] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A hydraulic valve spool, characterized in that, Comprising: A spool body (1) having an axial stepped end face; A groove (2) provided on the axial stepped end face and extending inside the spool body (1), the cross-sectional area of the notch of the groove (2) being larger than the cross-sectional area of the groove (2) adjacent to the bottom of the groove; and A spray hole (3) opened on the side wall of the groove (2) away from the axis of the spool body (1) and penetrating through the circumferential outer surface of the spool body (1), the spray hole (3) including a plurality of first holes (31) with different cross-sectional dimensions; Wherein, the cross-sectional dimensions of the plurality of first holes (31) vary along the axis of the spool body (1), and the cross-sectional dimension of the first hole (31) closer to the notch of the groove (2) among the plurality of first holes (31) is larger than the cross-sectional dimension of the first hole (31) closer to the bottom of the groove (2).

2. The hydraulic valve spool according to claim 1, wherein, The angle range formed by the axis of the spray hole (3) and the axis of the spool body (1) includes 70° - 100°.

3. The hydraulic valve spool according to claim 2, wherein The angle formed by the axis of the spray hole (3) and the axis of the spool body (1) is 90°.

4. The hydraulic valve spool according to claim 1, wherein, At least part of the plurality of first holes (31) are arranged equiangularly along the circumference of the spool body (1).

5. The hydraulic valve spool according to claim 1, wherein The spray hole (3) includes a plurality of second holes (32) with the same cross-sectional dimensions.

6. The hydraulic valve spool according to claim 5, wherein, The cross-sectional area of the notch of the groove (2) is larger than the cross-sectional area of the groove (2) adjacent to the bottom of the groove; Wherein, the number of the second holes (32) closer to the notch of the groove (2) among the plurality of second holes (32) is more than the number of the second holes (32) closer to the bottom of the groove (2).

7. The hydraulic valve spool according to claim 1, wherein, The groove (2) penetrates along the circumference of the spool body (1).

8. The hydraulic valve spool according to claim 1, characterized in that, The groove (2) is arranged at intervals along the circumference of the spool body (1).

9. The hydraulic valve spool according to claim 7, characterized in that, The side of the groove (2) away from the axis of the spool body (1) forms a conical surface with the circumferential outer surface of the spool body (1), and the side of the groove (2) close to the axis of the spool body (1) forms a cylindrical surface with the axis of the spool body (1).

10. The hydraulic valve spool according to claim 1, characterized in that, The groove (2) and / or the spool body (1) are configured to be obtained by additive manufacturing.

11. A hydraulic valve, comprising a hydraulic valve spool as described in any one of claims 1 - 10.

12. The hydraulic valve according to claim 11, wherein, The hydraulic valve further comprises: A valve body, the valve body including a valve hole for the axial sliding of the hydraulic valve spool; Wherein, the valve hole includes: An oil inlet chamber (41) provided on the side close to the notch of the groove (2); and An oil return chamber (42) provided on the side close to the bottom of the groove (2).

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