CN115076397A - Valve core of hydraulic valve and hydraulic valve - Google Patents

Abstract

The present disclosure relates to a hydraulic valve spool and a hydraulic valve, the hydraulic valve spool includes: the valve core body (1) is provided with an axial step end face; the groove (2) is arranged on the end face of the axial step and extends in the valve core body (1); and the injection hole (3) is formed in the side wall of one side, away from the axis of the valve core body (1), of the groove (2) and penetrates through the circumferential outer surface of the valve core body (1).

Description

Valve core of hydraulic valve and hydraulic valve

Technical Field

The utility model relates to an engineering machine tool field especially relates to a hydrovalve case and hydrovalve.

Background

For a large-flow hydraulic valve, the control performance of a valve core is mainly determined by hydraulic power, the valve core reversing action is possibly failed due to overlarge hydraulic power, signal interference is caused, the valve core action is disordered, and the stability and the reliability of the hydraulic valve are influenced.

The method for optimizing the influence of the hydraulic power of the valve core of the hydraulic valve on the hydraulic system in the industry mainly comprises the steps of reducing the influence of the hydraulic power on the hydraulic system through redundancy design, distributing the hydraulic power by designing a compensation structure on the valve core to reduce the influence on the hydraulic system and the like.

Disclosure of Invention

The inventor finds that in the related art, the hydraulic power cannot be really reduced or eliminated by distributing the hydraulic power through the design of the local compensation structure, and only the hydraulic power is transferred or balanced, so that the impact and the slow reversing of the reversing hydraulic power can be still caused in transient operation.

In view of this, the disclosed embodiment provides a hydraulic valve spool and a hydraulic valve, which effectively reduce the hydraulic power of the hydraulic valve spool.

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

the valve core body is provided with an axial step end face;

the groove is arranged on the end face of the axial step and extends in the valve core body; and

and the injection hole is formed in the side wall of the groove, which is far away from one side of the axis of the valve core body, and penetrates through the circumferential outer surface of the valve core body.

In some embodiments, the cross-sectional area of the notch of the groove is greater than the cross-sectional area of the groove adjacent the groove bottom.

In some embodiments, the range of an angle formed by the axis of the injection hole and the axis of the spool body includes 70 ° to 100 °.

In some embodiments, the axis of the injection hole forms an angle of 90 ° with the axis of the spool body.

In some embodiments, the injection hole includes a plurality of first holes having different sectional dimensions.

In some embodiments, the cross-sectional area of the notch of the groove is greater than the cross-sectional area of the groove adjacent the groove bottom;

the cross-sectional dimension of the first holes changes along the axis of the valve core body, and the cross-sectional dimension of the first hole close to the notch of the groove in the first holes is larger than that of the first hole close to the groove bottom of the groove.

In some embodiments, at least some of the first plurality of bores are equiangularly disposed along a circumference of the poppet body.

In some embodiments, the injection hole includes a plurality of second holes having the same cross-sectional size.

In some embodiments, the cross-sectional area of the notch of the groove is greater than the cross-sectional area of the groove adjacent the groove bottom;

wherein a number of second holes of the plurality of second holes near the notch of the groove is greater than a number of second holes near the groove bottom of the groove.

In some embodiments, the groove runs through the valve cartridge body in a circumferential direction.

In some embodiments, the grooves are spaced circumferentially along the poppet body.

In some embodiments, one side of the groove, which is far away from the axis of the valve core body, forms a conical surface with the circumferential outer surface of the valve core body, and one side of the groove, which is close to the axis of the valve core body, forms a cylindrical surface with the axis of the valve core body.

In some embodiments, the groove and/or the spool body is configured to be obtained by way of additive manufacturing.

In another aspect of the present disclosure, a hydraulic valve is provided, including a hydraulic valve spool as in any above.

In some embodiments, the hydraulic valve further comprises:

the valve body comprises a valve hole for the axial sliding of a valve core of the hydraulic valve;

wherein, the valve hole includes:

the oil inlet cavity is arranged on one side of the notch close to the groove; and

and the oil return cavity is arranged on one side close to the bottom of the groove.

Therefore, according to the embodiment of the disclosure, the groove extending along the inside of the valve core body is formed in the step end face of the valve core body, the jet holes penetrating through the circumferential outer surface of the valve core body are formed in the side wall of the groove, the groove and the flow channel formed by the jet holes can converge and pressurize hydraulic oil, and a large jet angle is formed, so that the micro-motion characteristic of the hydraulic valve during reversing opening and the quick response during subsequent reversing can be improved, the hydraulic power during valve core movement is reduced, and the problem of valve core slow performance reduction caused by overlarge hydraulic power during reversing of the valve core of the hydraulic valve is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 (a) is a schematic diagram of a structure of some embodiments of a hydraulic valve spool according to the present disclosure;

fig. 1 (b) is a sectional view of fig. 1 (a);

FIG. 2 is a schematic diagram of hydraulic oil flow directions for some embodiments of a hydraulic valve spool according to the present disclosure;

FIG. 3 (a) is a schematic diagram of alternate embodiments of a hydraulic valve spool according to the present disclosure;

fig. 3 (b) is a partially enlarged view of fig. 3 (a);

FIG. 4 (a) is a schematic diagram of hydraulic oil flow directions for other embodiments of a hydraulic valve spool according to the present disclosure;

fig. 4 (b) is a partially enlarged view of fig. 4 (a).

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

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 is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In the related technology, a local compensation structure is designed on a valve core of a hydraulic valve to share hydraulic power, but only the hydraulic power is transferred or balanced, the hydraulic power is not really reduced or eliminated, and the impact and the slow reversing of the reversing hydraulic power can still be caused in transient operation, so that the reversing performance of the valve core of the hydraulic valve is influenced. In addition, the valve core of the hydraulic valve in the related art is high in manufacturing cost and low in production efficiency in the additive manufacturing process, and is not beneficial to batch production and application.

In view of this, the disclosed embodiment provides a hydraulic valve spool and a hydraulic valve. Referring to fig. 1, in an aspect of the present disclosure, there is provided a hydraulic valve spool including a spool body 1, a groove 2, and an injection hole 3. The valve core body 1 is provided with an axial step end face, the groove 2 is arranged on the axial step end face and extends in the valve core body 1, and the jet hole 3 is formed in the side wall of one side of the groove 2, which is far away from the axis of the valve core body 1, and penetrates through the circumferential outer surface of the valve core body 1. The sidewalls of the trench 2 include, but are not limited to, straight lines and curved lines. The injection hole 3 includes, but is not limited to, a straight hole and an arc-shaped hole whose axis is curved.

In this embodiment, set up along the inside slot 2 that extends of case body 1 through the step terminal surface at case body 1 to set up the jet orifice 3 that runs through the circumference surface of case body 1 on the lateral wall of slot 2, slot 2 with the runner that jet orifice 3 formed can converge and the pressure boost to hydraulic oil, and form great jet angle, can promote the fine motion characteristic when the hydrovalve switching-over is opened and the quick response when follow-up switching-over, thereby reduce the hydrodynamic force when the case motion, avoid the problem that hydrodynamic force too big leads to case slow performance to reduce when the hydrovalve case switches over.

Referring to fig. 1, in some embodiments, the cross-sectional area of the notch of the groove 2 is greater than the cross-sectional area of the groove 2 adjacent the groove bottom. In this embodiment, the groove 2 is set to be a wedge-shaped structure with a large notch and a small groove bottom, so that the flow area of the flow channel is gradually reduced along the axis of the valve core body 1, thereby realizing the gathering of hydraulic oil pressure, increasing the flow rate of hydraulic oil, realizing the rapid movement and accurate control of the valve core of the hydraulic valve, and further ensuring the stability and reliability of the structural strength of the groove 2 and the injection hole 3. Wherein, the flow area is the accumulation of the circumferential projection areas of all the injection holes 3 after the valve core moves.

Referring to fig. 2, in some embodiments, an angle formed by an axis of the injection hole 3 and an axis of the valve cartridge body 1 is an angle a, and the angle a ranges from 70 ° to 100 °. According to the hydraulic valve core reversing hydraulic formula, the hydraulic force during reversing of the valve core of the hydraulic valve is in direct proportion to the cosine of the jet angle, in the embodiment, the jet angle formed by the axis of the jet hole 3 and the axis of the valve core body 1 is effectively increased compared with the related technology through the matching of the jet hole 3 and the groove 2, the hydraulic force during movement of the valve core of the hydraulic valve can be reduced, the phase change performance of the valve core of the hydraulic valve is ensured, the micro-motion characteristic during reversing opening of the hydraulic valve and the quick response during subsequent reversing are realized, and the reduction of hysteresis performance of the valve core caused by overlarge hydraulic force during reversing of the valve core is prevented.

Referring to fig. 2, in some embodiments, the axis of the injection hole 3 forms an angle a of 90 ° with the axis of the spool body 1. In this embodiment, the axis of the injection hole 3 is perpendicular to the axis of the valve element body 1, so that the cosine of the jet angle can reach the minimum value 0 when hydraulic oil is injected in a reversing manner, thereby eliminating the influence of hydraulic force and enabling the phase change performance of the valve element of the hydraulic valve to reach the optimal state.

Referring to fig. 1, in some embodiments, the injection hole 3 includes a plurality of first holes 31 having different sectional sizes, wherein at least four first holes 31 having different sectional sizes are included. In the embodiment, the side wall of the groove 2, which is far away from the side of the axis of the valve core body 1, is provided with the plurality of first holes 31 with different cross-sectional dimensions, the first holes 31 with small cross-sectional dimensions can enable the valve core of the hydraulic valve to obtain micro-motion characteristics when the displacement is small, the first holes 31 with large cross-sectional dimensions can enable the valve core of the hydraulic valve to obtain large flow area when the displacement is large, the first holes 31 with different cross-sectional dimensions are matched with each other, the relation between the displacement of the valve core and the flow area can be improved, the moving speed and the reversing accuracy of the valve core of the hydraulic valve are effectively improved, and the accurate control of the motion of the valve core of the hydraulic valve is realized.

Referring to fig. 1, in some embodiments, the cross-sectional area of the notch of the groove 2 is greater than the cross-sectional area of the groove 2 adjacent the groove bottom. The cross-sectional dimension of the plurality of first holes 31 varies along the axis of the spool body 1, and the cross-sectional dimension of the first hole 31 near 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 near the groove bottom of the groove 2.

In this embodiment, the cross-sectional dimensions of the first holes 31 are matched with the gradually shrinking wedge-shaped form of the groove 2 and change along with the axis of the valve core body 1, so that the first holes can be better matched with the groove 2, the flow rate of hydraulic oil passing through the bottom of the groove 2 is increased, the first holes 31 with small cross-sectional dimensions are prevented from being blocked by impurities, the moving speed of the valve core is guaranteed, and the valve core of the hydraulic valve is more accurately controlled in reversing.

Referring to fig. 1, in some embodiments, at least some of the plurality of first holes 31 are disposed at equal angles in the circumferential direction of the spool body 1. In this embodiment, the first holes 31 are uniformly distributed on the outer surface of the valve core body 1 at equal angles, so that hydraulic oil can uniformly flow out when the valve core is reversed, and further, the precision of the valve core of the hydraulic valve during reversing, the micro-motion characteristic of the hydraulic valve during reversing opening and the quick response during subsequent reversing are improved.

Referring to fig. 3, in some embodiments, the injection hole 3 includes a plurality of second holes 32 having the same sectional size. In this embodiment, through set up the different second hole 32 of a plurality of cross sectional dimensions on the lateral wall of the axis one side of keeping away from case body 1 at slot 2, can establish the case removal and the area relation of circulating flow of ideal, the area of circulating flow of case is less when making the case displacement, the area of circulating flow of case can increase rapidly when the case displacement is big, and the accumulation of a plurality of second holes 21 makes the case remove more slowly with the area relation curve transition of circulating flow, thereby the realization is to the accurate control of case motion. The arrangement mode of the second holes 32 on the outer surface of the valve core body 1 can be changed according to the actual requirement on the movement control of the valve core, and the design of the flow area is not limited by the shape of the traditional machining tool.

Referring to fig. 3, in some embodiments, the cross-sectional area of the notch of the groove 2 is greater than the cross-sectional area of the groove 2 adjacent the groove bottom, and the number of second holes 32 of the plurality of second holes 32 that are closer to the notch of the groove 2 is greater than the number of second holes 32 that are closer to the groove bottom of the groove 2. The plurality of second holes 32 include, but are not limited to, a central symmetrical arrangement along the axis of the cartridge body 1.

In this embodiment, the second holes 32 are distributed in a multi-layer concentrated manner, and the number of each layer is matched with the gradually shrinking wedge-shaped form of the groove 2 and changes along with the axis of the valve core body 1, so that the second holes are better matched with the groove 2, the transition of hydraulic oil in a flow passage is slow, and the reversing movement of the valve core can be accurately controlled.

Referring to fig. 1, in some embodiments, the groove 2 penetrates in the circumferential direction of the spool body 1. In this embodiment, can set up the form that groove 2 arranged along circumference according to actual demand to satisfy different through-flow area and case removal relation, groove 2 link up along the circumference of case body 1 and sets up, can realize bigger area's confluence to hydraulic oil, obtain bigger through-flow area when the displacement is great, promote the rapidity that hydrovalve case commutates.

Referring to fig. 3, in some embodiments, the grooves 2 are spaced apart along the circumference of the poppet body 1. In this embodiment, the grooves 2 may be arranged at intervals along the circumferential direction of the valve core body 1, so as to improve the micromotion performance of the valve core reversing of the hydraulic valve, and achieve more accurate reversing control.

Referring to fig. 1, in some embodiments, a side of the groove 2 away from the axis of the valve core body 1 forms a conical surface with the circumferential outer surface of the valve core body 1, and a 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.

In this embodiment, the cylindrical surface is formed by the axial line side of the groove 2 close to the valve element body 1 and the axial line of the valve element body 1, and the conical surface is formed by the axial line side of the groove 2 far away from the valve element body 1 and the circumferential outer surface of the valve element body 1, so that the reversing accuracy of the valve element of the hydraulic valve is improved, and meanwhile, the structural stability and reliability of the groove 2 and the jet hole 3 can be simultaneously met. Compared with a hydraulic element in the related art, the hydraulic valve core in the embodiment obviously reduces the processing and manufacturing difficulty, and is beneficial to batch production and application.

In some embodiments, the groove 2 and/or the poppet body 1 are configured to be obtained by way of additive manufacturing. Hydraulic components such as a hydraulic valve body and a hydraulic valve core in the related art often have high manufacturing cost and low production efficiency, are not suitable for batch production through additive manufacturing, and limit popularization and application of additive innovative design hydraulic components with excellent performance. The design of hydrovalve case in this embodiment effectively avoids the problem that traditional machine tooling cutter can't reach, has reduced through the manufacturing degree of difficulty of modes such as 3D printing, piecemeal manufacturing back connection, is favorable to realizing the mass production and the rapid manufacturing of hydrovalve case.

In another aspect of the present disclosure, a hydraulic valve is provided, including a hydraulic spool as in any one of the above. In the embodiment, the hydraulic valve can avoid the problem of reduction of valve core hysteresis performance caused by overlarge hydraulic force in the related technology, effectively improves the reversing accuracy of the valve core of the hydraulic valve, realizes the free design of valve core displacement and flow area curves, and can be efficiently produced and applied through additive manufacturing.

Referring to fig. 2 and 4, in some embodiments, the hydraulic valve further includes a valve body including a valve hole for axially sliding a spool of the hydraulic valve, the valve hole including an oil inlet chamber 41 and an oil return chamber 42, the oil inlet chamber 41 being disposed at a side near a notch of the groove 2, and the oil return chamber 42 being disposed at a side near a bottom of the groove 2. In this embodiment, the hydraulic oil flows into the groove 2 through the oil inlet chamber 41, and flows out from the injection hole 3 to the oil return chamber 42.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (15)

1. A hydraulic valve spool, comprising:

the valve core body (1) is provided with an axial step end face;

the groove (2) is arranged on the end face of the axial step and extends in the valve core body (1); and

and the injection hole (3) is formed in the side wall of the groove (2) on the side far away from the axis of the valve core body (1) and penetrates through the circumferential outer surface of the valve core body (1).

2. The hydraulic valve spool according to claim 1, characterized in that 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 groove bottom.

3. The spool of the hydraulic valve as recited in claim 1, wherein an angle formed by an axis of the injection hole (3) and an axis of the spool body (1) includes 70 ° to 100 °.

4. The hydraulic valve spool according to claim 3, characterized in that the axis of the injection hole (3) forms an angle of 90 ° with the axis of the spool body (1).

5. The hydraulic valve spool according to claim 1 or 2, characterized in that the injection hole (3) comprises a plurality of first holes (31) of different cross-sectional dimensions.

6. The hydraulic valve spool according to claim 5, characterised in that the cross section of the mouth of the groove (2) has a larger area than the cross section of the groove (2) adjacent to the bottom of the groove;

wherein the cross-sectional dimension of the first holes (31) varies along the axis of the spool body (1), and the cross-sectional dimension of a first hole (31) of the first holes (31) near the notch of the groove (2) is larger than the cross-sectional dimension of a first hole (31) near the bottom of the groove (2).

7. The hydraulic valve spool according to claim 5, characterized in that at least some of the first bores (31) are arranged equiangularly in the circumferential direction of the spool body (1).

8. The hydraulic valve spool according to claim 1 or 2, characterized in that the injection hole (3) comprises a plurality of second holes (32) of the same cross-sectional size.

9. The hydraulic valve spool according to claim 8, characterized in that the cross section of the notch of the groove (2) has a larger area than the cross section of the groove (2) adjacent to the bottom of the groove;

wherein the number of second holes (32) of the plurality of second holes (32) close to the notch of the groove (2) is greater than the number of second holes (32) close to the groove bottom of the groove (2).

10. The hydraulic valve spool according to claim 1, characterized in that the groove (2) runs through in the circumferential direction of the spool body (1).

11. The hydraulic valve spool according to claim 1, characterized in that the grooves (2) are arranged at intervals in the circumferential direction of the spool body (1).

12. The hydraulic valve spool according to claim 10, wherein one 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 one 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).

13. 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 means of additive manufacturing.

14. A hydraulic valve comprising a hydraulic valve spool according to any one of claims 1 to 13.

15. The hydraulic valve of claim 14, further comprising:

the valve body comprises a valve hole for the axial sliding of the valve core of the hydraulic valve;

wherein the valve hole includes:

an oil inlet chamber (41) provided at a side close to the notch of the groove (2); and

and the oil return cavity (42) is arranged at one side close to the bottom of the groove (2).

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