Full-balance rotary hydraulic valve

Abstract

The utility model discloses a full-balance rotary hydraulic valve which 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 which are distributed up and down and two valve element auxiliary oil holes which are distributed up and down are formed in the side walls, opposite to each valve sleeve working oil hole and each valve element working oil hole, of the valve sleeve and 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.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary valve technical field, especially a full balance rotary hydraulic valve. BACKGROUND

[0002] Rotary hydraulic valve completes the on-off switching of oil circuit in the rotation process of the valve core, if no balance measures are taken, the valve core of the rotary hydraulic valve is pushed to one side of the valve cavity by hydraulic pressure, then the valve core will rub with the valve cavity and increase the rotation resistance of the valve core, especially under high pressure, the friction between the valve core and the valve cavity is huge, which can cause the valve core to be stuck, the reason of pushing the valve core to one side of the valve cavity is that the valve core is unbalanced in force, the pushing force that makes the valve core unbalanced in force has two sources: the oil hole of the valve core itself and the oil hole of the valve cavity.

[0003] The prior art balances the force of the valve core by punching an auxiliary oil hole on the back of the working oil hole on the valve core, which is communicated with the working hole and has the same cross-sectional area as the working hole, however, if only one auxiliary balance hole is set to balance the working oil hole, in order that the valve core is not pushed and twisted, the auxiliary oil hole and the working oil hole must be arranged on a horizontal section, thus, the valve core originally having n working oil holes (oil outlets) on the horizontal section can only have n / 2 working oil holes (oil outlets), at this time, the length of the valve core needs to be increased and the working oil hole (oil outlet) and the corresponding balance oil hole are arranged on another horizontal section, which increases the volume of the valve block. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the utility model provides a full balance rotary hydraulic valve.

[0005] In order to achieve the above purpose, the utility model is implemented according to the following technical solutions:

[0006] A full balance 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, a center hole is arranged in the center of the valve core, first through holes are symmetrically arranged in the two side walls of the valve core and communicated with the center hole, and an annular groove is arranged in the circumference of the valve core at the first through hole;

[0007] The valve body is assembled with a valve sleeve in interference fit, the valve core is assembled in the valve sleeve in axial rotation, second through holes are symmetrically arranged in the two side walls of the valve sleeve and correspond to the first through holes, and an oil inlet hole is arranged on the valve body and corresponds to the second through hole;

[0008] The valve core and valve sleeve have valve core working oil holes and valve sleeve working oil holes on one side wall of each valve body working oil port corresponding to the valve body working oil port. On the side wall of the valve sleeve and valve core opposite to each valve sleeve working oil hole and valve core working oil hole, there are two valve sleeve auxiliary oil holes and two valve core auxiliary oil holes distributed vertically. Each valve sleeve working oil hole is connected to the two valve sleeve auxiliary oil holes through a connecting groove opened 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.

[0009] Furthermore, each of the communicating grooves includes a first longitudinal groove, an arc-shaped groove, and a second longitudinal groove. The bottom of the first longitudinal groove is connected to the working oil hole of the valve sleeve, and the two ends of the second longitudinal groove are connected to two auxiliary oil holes of the valve sleeve. One end of the arc-shaped groove is connected to one end of the first longitudinal groove, and the other end of the arc-shaped groove is connected to an auxiliary oil hole of the valve sleeve located above.

[0010] Furthermore, the number of horizontal distribution layers of the valve body working oil port is set to 2-3 layers.

[0011] Furthermore, each valve body working port is horizontally distributed with 3-5 valve body working ports.

[0012] Compared with the prior art, this utility model provides two vertically distributed auxiliary oil holes for the valve sleeve and two vertically distributed auxiliary oil holes for the valve core on the side walls of the valve sleeve and valve core opposite to each working oil hole of the valve sleeve and the working oil hole of the valve core. By using two auxiliary oil holes instead of one large hole to balance the working oil holes, the valve core is prevented from being pushed off course. This arrangement is beneficial for reducing the volume of the hydraulic valve and improving the material utilization rate when a valve body contains multiple working oil holes (for example, a rotary valve with multiple oil outlets and oil supply to multiple lubrication points). The reason is that, assuming no thrust balance is considered, there are n working oil holes (connected to the oil outlets) on a horizontal cross section of the valve body. When thrust balance is considered and auxiliary balancing oil holes are added, using two auxiliary oil holes with the cross sections of the two auxiliary oil holes symmetrically distributed above and below the cross sections of the working oil holes, the valve body can still have n oil outlets even after adding two auxiliary oil holes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the assembly of a fully balanced rotary hydraulic valve according to one embodiment of the present invention (the drive mechanism for driving the valve core to rotate in the valve body is not shown).

[0014] Figure 2 This is a schematic diagram of the valve body according to one embodiment of the present invention.

[0015] Figure 3The utility model discloses a structure schematic diagram of the valve sleeve of an embodiment mode.

[0016] Figure 4 The utility model discloses a structure schematic diagram of the valve core of an embodiment mode.

[0017] Figure 5 The utility model discloses a structure schematic diagram of the communication groove of an embodiment mode. Specific implementation

[0018] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with embodiment, and the utility model is further detailedly explained.This specific embodiment described here is only used for explaining the utility model and is not used for limiting the utility model.

[0019] As Figures 1-5 The utility model discloses a structure schematic diagram of the valve sleeve of an embodiment mode.

[0020] The utility model discloses a structure schematic diagram of the valve sleeve of an embodiment mode.

[0021] The utility model discloses a structure schematic diagram of the valve sleeve of an embodiment mode.

[0022] The valve core 2 and valve sleeve 3 have a second valve core working oil hole 204 and a second valve sleeve working oil hole 303 on one side wall of the second valve body working oil port 102 corresponding to the valve body 1. Each second valve sleeve working oil hole 303 and the second valve core working oil hole 204 are provided on the side wall of the valve sleeve 3 and valve core 1 opposite to the second valve core working oil hole 204. Each second valve sleeve working oil hole 3031 is connected to the two second valve sleeve auxiliary oil holes 3031 through a connecting groove 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. This balances the thrust of the working oil hole on the valve core and the thrust of the auxiliary oil hole on the valve core, thereby preventing the valve core from being pushed off course.

[0023] In this embodiment, the auxiliary oil holes on the valve core and valve sleeve are two small holes instead of one large hole to achieve balance with the working oil holes. This arrangement is beneficial for reducing the volume of the hydraulic valve and improving material utilization when a valve body contains multiple working oil holes (e.g., a rotary valve with multiple oil outlets supplying oil to multiple lubrication points). The reason is: assuming that thrust balance is not considered, there are n working oil holes (oil outlets) on a horizontal cross-section of the valve body; then, when considering thrust balance and increasing the number of auxiliary oil holes, using two small holes and the cross-section containing the two small holes... When the auxiliary holes are symmetrically distributed at the top and bottom of the cross-section where the working oil holes are located, the valve block can still have n oil outlets even after adding auxiliary holes. If only one auxiliary hole is set to balance the working oil holes, in order to prevent the valve core from being pushed off course or twisted, the auxiliary oil holes and working oil holes must be set on the same horizontal cross-section. In this way, the valve core horizontal cross-section, which originally could have a maximum of n working oil holes (oil outlets), can only have n / 2 working oil holes (oil outlets). At this time, it is necessary to increase the length of the valve core and set the working oil holes (oil outlets) and corresponding balancing oil holes on another horizontal cross-section, thus increasing the volume of the valve block.

[0024] The following explanation uses the connection between the working oil hole 302 of the first valve sleeve and the two auxiliary oil holes 3021 of the first valve sleeve as an example. Figure 5 As shown, the connecting groove in this embodiment includes a first longitudinal groove 4, an arc-shaped groove 5, and a second longitudinal groove 6. The bottom of the first longitudinal groove 4 is connected to the working oil hole 302 of the first valve sleeve. The two ends of the second longitudinal groove 6 are connected to two auxiliary oil holes 3021 of the first valve sleeve or the auxiliary oil hole of the second valve sleeve. One end of the arc-shaped groove 5 is connected to one end of the first longitudinal groove 4, and the other end of the arc-shaped groove 6 is connected to one auxiliary oil hole 3021 of the first valve sleeve located above.

[0025] When the full-balance rotary hydraulic valve is used to inject hydraulic oil, the annular groove 205 can be always communicated with the center hole 203 of the valve core 2 by continuously injecting the oil from the oil inlet hole 103 into the valve body 1; when the valve core 2 rotates, when the first valve core working oil hole 202 is aligned with the first valve sleeve working oil hole 302, the first valve sleeve working oil hole 302 corresponding first valve body working oil port 101 is injected; when the second valve core working oil hole 204 is aligned with the second valve sleeve working oil hole 303, the second valve sleeve working oil hole 303 corresponding second valve body working oil port 102 is injected, at this time, due to the design of the auxiliary oil hole, the thrust of the working oil hole on the valve sleeve 3 and the thrust of the auxiliary oil hole of the valve sleeve 3 on the valve core are balanced, so that the valve core is prevented from being pushed off.

[0026] In some embodiments, two working oil holes are arranged in the upper and lower cross-section layers (two layers) of the valve core 2, and two auxiliary oil holes corresponding to each working oil hole are symmetrically arranged in the upper and lower cross-section layers; more generally, more working oil holes (oil outlets) can be arranged in the same horizontal cross-section layer (preferably 3, 4 or 5 working oil holes are arranged in one layer), and more working oil hole horizontal distribution layers can be arranged on the same valve core (preferably 2 or 3 working oil hole layers are arranged on one valve core).

[0027] The technical scheme of the utility model is not limited to the above specific embodiments, and any technical deformation according to the technical scheme of the utility model falls within the protection scope of the utility model.

Claims

1. A full 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, the valve core is provided with a central hole in the center, and first through holes are symmetrically arranged in the two side walls of the valve core and communicated with the central hole, and an annular groove is arranged in the circumferential direction of the valve core at the first through hole; characterized in that: a valve sleeve is assembled in the valve body by interference fit, the valve core is assembled in the valve sleeve by axial rotation, second through holes are symmetrically arranged in the two side walls of the valve sleeve corresponding to the first through holes, and oil inlet holes are arranged in 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 valve body working oil port horizontal distribution layer comprises a plurality of valve body working oil ports arranged in the circumferential direction; the valve core and the valve sleeve are provided with valve core working oil holes and valve sleeve working oil holes communicated with the valve body working oil ports on one side wall corresponding to each valve body working oil port of the valve body, two valve sleeve auxiliary oil holes and two valve core auxiliary oil holes are arranged on the side walls of the valve sleeve and the valve core opposite to each valve sleeve working oil hole and each valve core working oil hole, and each valve sleeve working oil hole is connected with two valve sleeve auxiliary oil holes through a communication groove arranged 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. Each communication groove comprises a first longitudinal groove, an arc-shaped groove and a second longitudinal groove, the first longitudinal groove is communicated with the valve sleeve working oil hole at the bottom, the second longitudinal groove is connected with two valve sleeve auxiliary oil holes at both ends, one end of the arc-shaped groove is communicated with one end of the first longitudinal groove, and the other end of the arc-shaped groove is connected with one valve sleeve auxiliary oil hole located above.

2. The full balanced rotary hydraulic valve of claim 1, wherein: The number of valve body working oil port horizontal distribution layers is set to 2-3 layers.

3. The full balanced rotary hydraulic valve of claim 1, wherein: 3-5 valve body working oil ports are arranged in each valve body working oil port horizontal distribution layer.

4. The full balanced rotary hydraulic valve of claim 3, wherein: ​

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