Full-balance rotary hydraulic valve

By opening two upper and lower auxiliary oil holes on the valve core and valve sleeve of the rotary hydraulic valve, the problem of unbalanced pressure of the rotary hydraulic valve under high pressure is solved, and the full balance design of the valve core is achieved, reducing the valve volume and improving the material utilization rate.

CN119802274APending Publication Date: 2025-04-11JIAOZUO SHENGJING TECH CO LTD
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Patent Information

Application Number
CN202510012837.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-06
Publication Date
2025-04-11

AI Technical Summary

Technical Problem

Existing rotary hydraulic valves are prone to cause the valve core to get stuck under high pressure. The reason is that the valve core is subjected to imbalance, which causes huge friction between the valve core and the valve cavity.

Method used

By opening two upper and lower auxiliary oil holes on the side walls of the valve core and the valve sleeve, two small holes are used to balance the stress of the working oil hole, thereby avoiding the valve core being pushed and deviated.

Benefits of technology

This design reduces the volume of the hydraulic valve while maintaining multiple working oil holes, improves the utilization rate of materials, and avoids the phenomenon of the valve core stuck.

✦ Generated by Eureka AI based on patent content.

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Abstract

The full-balance rotary hydraulic valve comprises a valve body, a valve element, a driving mechanism, a center hole, a first through hole, a valve sleeve, a second through hole, a valve body working oil port, a valve element working oil hole, a valve sleeve working oil hole, a valve sleeve auxiliary oil hole, a valve element auxiliary oil hole and a valve sleeve auxiliary oil hole. The sectional area of the valve sleeve auxiliary oil hole is 1 / 2 of the sectional area of the valve sleeve working oil hole, and the sectional area of the valve element auxiliary oil hole is 1 / 2 of the sectional area of the valve element working oil hole. Two valve sleeve auxiliary oil holes distributed up and down and two valve element auxiliary oil holes distributed up and down are formed in the positions, opposite to each valve sleeve working oil hole and each valve element working oil hole, of the side wall of the valve sleeve and the side wall of the valve element, and balance of the working oil holes is completed through the two auxiliary oil holes instead of a large hole. Under the condition that one valve body comprises a plurality of working oil holes, the size of the hydraulic valve is reduced, and the utilization rate of materials is increased.
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Description

Technical Field

[0001] The invention relates to the technical field of rotary valves, in particular to a fully balanced rotary hydraulic valve. Background Art

[0002] The rotary hydraulic valve completes the on-off switching of the oil circuit during the rotation of the valve core. If no balancing measures are taken, the valve core of the rotary hydraulic valve is pushed to one side of the valve cavity by the hydraulic pressure, and the valve core will produce friction with the valve cavity, increasing the rotation resistance of the valve core. Especially under high pressure conditions, the friction between the valve core and the valve cavity is huge, which will cause the valve core to get stuck. The reason for pushing the valve core to one side of the valve cavity is that the force on the valve core is unbalanced. The thrust that makes the valve core unbalanced has two sources: the oil hole from the valve core itself and the oil hole from the valve cavity.

[0003] The prior art balances the force on the valve core by drilling an auxiliary oil hole on the back of the working oil hole on the valve core, which is connected to the working hole and has the same cross-sectional area as the working hole. However, if only one auxiliary balancing hole is set to balance the working oil hole, in order to prevent the valve core from being pushed off or twisted, the auxiliary oil hole and the working oil hole must be set on the same horizontal section. In this way, only n / 2 working oil holes (oil outlets) can be set on the horizontal section of the valve core, which can originally have a maximum of n working oil holes (oil outlets). At this time, it is necessary to increase the length of the valve core, set the working oil hole (oil outlet) and the corresponding balancing oil hole on another horizontal section, and increase the volume of the valve block. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a fully balanced rotary hydraulic valve.

[0005] To achieve the above object, the present invention is implemented according to the following technical solutions: A fully balanced rotary hydraulic valve comprises a valve body, a valve core rotatably arranged in the valve body, and a driving mechanism for driving the valve core to rotate in the valve body, wherein a central hole is provided at the center of the valve core, first through holes communicating with the central hole are symmetrically provided on both side walls of the valve core, and an annular groove is provided in the circumference of the valve core at the first through hole; The valve body is fitted with a valve sleeve in an interference fit, the valve core is axially rotatably fitted in the valve sleeve, second through holes are symmetrically arranged at the two side walls of the valve sleeve corresponding to the first through holes, and an oil inlet hole is opened on the valve body corresponding to the second through holes; the valve body is provided with a plurality of valve body working oil port horizontal distribution layers from bottom to top, and each layer of valve body working oil port horizontal distribution layers includes a plurality of valve body working oil ports arranged circumferentially; A valve core working oil hole and a valve sleeve working oil hole connected to the valve body working oil port are formed on one side wall of each valve body working oil port of the valve core and the valve sleeve corresponding to the valve body; two valve sleeve auxiliary oil holes distributed up and down and two valve core auxiliary oil holes distributed up and down are formed on the side walls of the valve sleeve and the valve core opposite to each valve sleeve working oil hole and valve core working oil hole; each valve sleeve working oil hole is connected to two valve sleeve auxiliary oil holes via a connecting groove formed on the outer wall of the valve sleeve; the cross-sectional area of ​​the valve sleeve auxiliary oil hole is 1 / 2 of the cross-sectional area of ​​the valve sleeve working oil hole, and the cross-sectional area of ​​the valve core auxiliary oil hole is 1 / 2 of the cross-sectional area of ​​the valve core working oil hole.

[0006] Furthermore, each of the connecting grooves includes a first longitudinal groove, an arcuate groove and a second longitudinal groove, the bottom of the first longitudinal groove is connected to the valve sleeve working oil hole, the two ends of the second longitudinal groove are connected to two valve sleeve auxiliary oil holes, one end of the arcuate groove is connected to one end of the first longitudinal groove, and the other end of the arcuate groove is connected to a valve sleeve auxiliary oil hole located above.

[0007] Furthermore, the number of horizontal distribution layers of the working oil port of the valve body is set to 2-3 layers.

[0008] Furthermore, 3-5 valve body working oil ports are arranged in each horizontal distribution layer of the valve body working oil ports.

[0009] Compared with the prior art, the present invention provides two valve sleeve auxiliary oil holes and two valve core auxiliary oil holes on the side walls of the valve sleeve and the valve core opposite to each valve sleeve working oil hole and the valve core working oil hole, respectively, and adopts two auxiliary oil holes instead of one large hole to complete the balance of the working oil holes, thereby preventing the valve core from being pushed off-center. Such an arrangement is beneficial to reducing the volume of the hydraulic valve and improving the utilization rate of materials when a valve body includes multiple working oil holes (for example, a rotary valve includes multiple oil outlets and supplies oil to multiple lubrication points). The reason is that: assuming that thrust balance is not considered, n working oil holes (connecting the oil outlets) are provided on a horizontal section of the valve body. When thrust balance is considered and auxiliary balancing oil holes are added, two auxiliary oil holes are used, and the sections where the two auxiliary oil holes are located are symmetrically distributed at the upper and lower parts of the section where the working oil holes are located. After the two auxiliary oil holes are added, the valve body can still have n oil outlets. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the assembly of a fully balanced rotary hydraulic valve according to an embodiment of the present invention (the driving mechanism for driving the valve core to rotate in the valve body is not shown).

[0011] Figure 2 The figure is a schematic structural diagram of a valve body according to an embodiment of the present invention.

[0012] Figure 3The figure is a schematic structural diagram of a valve sleeve according to an embodiment of the present invention.

[0013] Figure 4 The figure is a schematic diagram of the structure of a valve core according to an embodiment of the present invention.

[0014] Figure 5 It is a schematic structural diagram of a connecting groove according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the invention.

[0016] like Figure 1-Figure 5 As shown, this embodiment exemplarily shows a fully balanced rotary hydraulic valve, comprising a valve body 1, a valve core 2 rotatably arranged in the valve body 1, and a driving mechanism for driving the valve core to rotate in the valve body, a center hole 203 is provided at the center of the valve core 2, first through holes 201 communicating with the center hole 203 are symmetrically opened on both side walls of the valve core 2, and an annular groove 205 is circumferentially provided on the valve core 2 at the first through hole 201; A valve sleeve 3 is assembled in the valve body 1 by interference fit, and the valve core 2 is axially rotatably assembled in the valve sleeve 3. Second through holes 301 are symmetrically arranged on the two side walls of the valve sleeve 3 corresponding to the first through hole 201. An oil inlet hole 103 is opened on the valve body 1 corresponding to the second through hole 301. When grease enters the valve body 1 from the oil inlet hole 103, it can always communicate with the center hole 203 of the valve core 2 through the annular groove 205. By way of example, in this embodiment, a first valve body working oil port 101 is arranged at the upper end of the valve body 1, and a second valve body working oil port 102 is arranged at the lower end, that is, two oil outlets are arranged in this embodiment. A first valve core working oil hole 202 and a first valve sleeve working oil hole 302 communicating with the first valve body working oil hole 101 are provided on one side wall of the valve core 2 and the valve sleeve 3 corresponding to the first valve body working oil port 101 of the valve body 1. Two first valve sleeve auxiliary oil holes 3021 distributed up and down and two first valve core auxiliary oil holes 2021 distributed up and down are provided on the side walls of the valve sleeve 3 and the valve core 2 opposite to each first valve sleeve working oil hole 302 and the first valve core working oil hole 202. The first valve sleeve working oil hole 302 is connected to the two first valve sleeve auxiliary oil holes 3021 via a connecting groove provided on the outer wall of the valve sleeve 3; the cross-sectional area of ​​the first valve sleeve auxiliary oil hole 3021 is 1 / 2 of the cross-sectional area of ​​the first valve sleeve working oil hole 302, and the cross-sectional area of ​​the first valve core auxiliary oil hole 2021 is 1 / 2 of the cross-sectional area of ​​the first valve core working oil hole 202; A second valve core working oil hole 204 and a second valve sleeve working oil hole 303 communicating with the second valve body working oil port 102 are formed on one side wall of the valve core 2 and the valve sleeve 3 corresponding to the second valve body working oil port 102 of the valve body 1; two second valve sleeve auxiliary oil holes 3031 distributed up and down and two second valve core auxiliary oil holes 2041 distributed up and down are formed on the side walls of the valve sleeve 3 and the valve core 1 opposite to each second valve sleeve working oil hole 303 and the second valve core working oil hole 204, and each second valve sleeve working oil hole 3031 is connected to two second valve sleeve auxiliary oil holes 3031 through a connecting groove formed on the outer wall of the valve sleeve 3; the cross-sectional area of ​​the second valve sleeve auxiliary oil hole 3031 is 1 / 2 of the cross-sectional area of ​​the second valve sleeve working oil hole 303, and the cross-sectional area of ​​the second valve core auxiliary oil hole 2041 is 1 / 2 of the cross-sectional area of ​​the second valve core working oil hole 204. The thrust of the working oil hole on the valve sleeve 3 on the valve core and the thrust of the auxiliary oil hole on the valve sleeve 3 on the valve core are balanced, thereby preventing the valve core from being pushed off.

[0017] In this embodiment, the auxiliary oil hole on the valve core and the auxiliary oil hole on the valve sleeve adopt two small holes instead of one large hole to complete the balance with the working oil hole. Such an arrangement is conducive to reducing the volume of the hydraulic valve and improving the utilization rate of materials when a valve body includes multiple working oil holes (for example, a rotary valve includes multiple oil outlets and supplies oil to multiple lubrication points). The reason is that: assuming that thrust balance is not considered, n working oil holes (oil outlets) are arranged on a horizontal section of the valve body; then, when considering thrust balance and adding auxiliary oil holes, two small holes and the cross section where the two small holes are located are adopted. When they are symmetrically distributed at the upper and lower parts of the cross-section where the working oil holes are located, the valve block can still have n oil outlets after adding the auxiliary small holes; if only one auxiliary hole is set to balance the working oil hole, in order to prevent the valve core from being pushed off course or twisted, the auxiliary oil hole and the working oil hole must be set on the same horizontal cross-section. In this way, only n / 2 working oil holes (oil outlets) can be set on the horizontal cross-section of the valve core that can originally have a maximum of n working oil holes (oil outlets). At this time, it is necessary to increase the length of the valve core, set the working oil hole (oil outlet) and the corresponding balancing oil hole in another horizontal cross-section, thereby increasing the volume of the valve block.

[0018] The connection between the first valve sleeve working oil hole 302 and the two first valve sleeve auxiliary oil holes 3021 is used as an example for explanation. Figure 5 As shown, the connecting groove of this embodiment includes a first longitudinal groove 4, an arcuate groove 5 and a second longitudinal groove 6. The bottom of the first longitudinal groove 4 is connected to the first valve sleeve working oil hole 302, and the two ends of the second longitudinal groove 6 are connected to two first valve sleeve auxiliary oil holes 3021 or second valve sleeve auxiliary oil holes. One end of the arcuate groove 5 is connected to one end of the first longitudinal groove 4, and the other end of the arcuate groove 6 is connected to a first valve sleeve auxiliary oil hole 3021 located above.

[0019] When the fully balanced rotary hydraulic valve of the present invention is used for filling hydraulic oil, after the grease is continuously injected into the valve body 1 through the oil inlet hole 103, the annular groove 205 can always be connected with the central hole 203 of the valve core 2; when the valve core 2 is rotating, when the first valve core working oil hole 202 is aligned with the first valve sleeve working oil hole 302, the first valve body working oil port 101 corresponding to the first valve sleeve working oil hole 302 is filled with oil; when the second valve core working oil hole 204 is aligned with the second valve sleeve working oil hole 303, the second valve body working oil port 102 corresponding to the second valve sleeve working oil hole 303 is filled with oil. At this time, due to the design of the auxiliary oil hole, the thrust of the working oil hole on the valve sleeve 3 on the valve core and the thrust of the auxiliary oil hole of the valve sleeve 3 on the valve core are balanced, thereby preventing the valve core from being pushed off.

[0020] In some embodiments, a working oil hole is provided in each of the upper and lower cross-sectional layers (divided into two layers) of the valve core 2, and the two corresponding auxiliary oil holes are symmetrically provided in the upper and lower cross-sectional layers of the working oil hole; the more general situation is: more working oil holes (oil outlets) can be provided in the same horizontal cross-sectional layer (preferably 3, 4, or 5 working oil holes are provided in one layer), and more horizontal distribution layers of working oil holes (oil outlets) are provided on the same valve core (the preferred number of working oil hole layers of a valve core is 2 or 3).

[0021] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A fully balanced rotary hydraulic valve, comprising a valve body, a valve core rotatably arranged in the valve body, and a driving mechanism for driving the valve core to rotate in the valve body, wherein a center hole is provided at the center of the valve core, first through holes communicating with the center hole are symmetrically provided on both side walls of the valve core, and an annular groove is provided in the circumference of the valve core at the first through hole; characterized in that: The valve body is fitted with a valve sleeve in an interference fit, the valve core is axially rotatably fitted in the valve sleeve, second through holes are symmetrically arranged at the two side walls of the valve sleeve corresponding to the first through holes, and an oil inlet hole is opened on the valve body corresponding to the second through holes; the valve body is provided with a plurality of valve body working oil port horizontal distribution layers from bottom to top, and each layer of valve body working oil port horizontal distribution layers includes a plurality of valve body working oil ports arranged circumferentially; A valve core working oil hole and a valve sleeve working oil hole connected to the valve body working oil port are formed on one side wall of each valve body working oil port of the valve core and the valve sleeve corresponding to the valve body; two valve sleeve auxiliary oil holes distributed up and down and two valve core auxiliary oil holes distributed up and down are formed on the side walls of the valve sleeve and the valve core opposite to each valve sleeve working oil hole and valve core working oil hole; each valve sleeve working oil hole is connected to two valve sleeve auxiliary oil holes via a connecting groove formed on the outer wall of the valve sleeve; the cross-sectional area of ​​the valve sleeve auxiliary oil hole is 1 / 2 of the cross-sectional area of ​​the valve sleeve working oil hole, and the cross-sectional area of ​​the valve core auxiliary oil hole is 1 / 2 of the cross-sectional area of ​​the valve core working oil hole.

2. The fully balanced rotary hydraulic valve according to claim 1, characterized in that: Each of the connecting grooves includes a first longitudinal groove, an arcuate groove and a second longitudinal groove. The bottom of the first longitudinal groove is connected to the valve sleeve working oil hole, and the two ends of the second longitudinal groove are connected to two valve sleeve auxiliary oil holes. One end of the arcuate groove is connected to one end of the first longitudinal groove, and the other end of the arcuate groove is connected to a valve sleeve auxiliary oil hole located above.

3. The fully balanced rotary hydraulic valve according to claim 1, characterized in that: The number of horizontal distribution layers of the working oil port of the valve body is set to 2-3 layers.

4. The fully balanced rotary hydraulic valve according to claim 3, characterized in that: Each valve body working oil port horizontal distribution layer is provided with 3-5 valve body working oil ports.