阅读说明：本技术 一种低空化的并联式溢流阀 (Low-cavitation parallel overflow valve ) 是由 袁聪 朱丽莎 李焕军 李鹤 王悦勇 杜尊令 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种低空化的并联式溢流阀,阀体内开设有输油腔,阀套固设于输油腔内,阀套侧面开设有环槽,阀套顶部开设有两个以上第一通孔,第一通孔与环槽连通,锥形阀芯滑动连接于第一通孔内,顶板设置于阀套上方,且顶板与输油腔滑动连接,两个以上柱塞固设于顶板底部,且柱塞插接于第一通孔内,锥形阀芯与柱塞之间抵接有压缩弹簧,阀套底部开设有第二通孔,第二通孔与环槽连通,锥形阀芯抵于第二通孔上,阀体的一侧开设有与环槽连通的油液出口,阀体底部开设有与输油腔连通的油液入口。通过并联设置多个锥形阀芯,既能抑制旋涡空化的增长,实现在高强度空化流动条件下显著降低空化强度,同时又能保证溢流阀具有较大的流通能力。(The invention discloses a low-cavitation parallel overflow valve, wherein an oil conveying cavity is formed in a valve body, a valve sleeve is fixedly arranged in the oil conveying cavity, a ring groove is formed in the side surface of the valve sleeve, more than two first through holes are formed in the top of the valve sleeve and communicated with the ring groove, a conical valve core is connected in the first through holes in a sliding mode, a top plate is arranged above the valve sleeve and is connected with the oil conveying cavity in a sliding mode, more than two plungers are fixedly arranged at the bottom of the top plate and are inserted into the first through holes, a compression spring is abutted between the conical valve core and the plungers, a second through hole is formed in the bottom of the valve sleeve and communicated with the ring groove, the conical valve core abuts against the second through hole, an oil outlet communicated with the ring groove is formed in one side of the valve body, and an oil inlet communicated with the oil conveying cavity is formed in the bottom of the valve body. The plurality of conical valve cores are arranged in parallel, so that the increase of the vortex cavitation can be inhibited, the cavitation intensity can be obviously reduced under the high-intensity cavitation flow condition, and meanwhile, the overflow valve can be ensured to have larger flow capacity.)

1. A low-cavitation parallel overflow valve is characterized in that: comprises a valve body (1), a valve sleeve (2), a top plate (4), plungers (5), a compression spring (6) and a conical valve core (7), wherein an oil conveying cavity (8) is formed in the valve body (1), the valve sleeve (2) is fixedly arranged in the oil conveying cavity (8), a ring groove (3) is formed in the side surface of the valve sleeve (2), more than two first through holes (11) are formed in the top of the valve sleeve (2), the first through holes (11) are communicated with the ring groove (3), the conical valve core (7) is connected in the first through holes (11) in a sliding manner, the top plate (4) is arranged above the valve sleeve (2), the top plate (4) is connected with the oil conveying cavity (8) in a sliding manner, more than two plungers (5) are fixedly arranged at the bottom of the top plate (4), the plungers (5) are inserted in the first through holes (11), the compression spring (6) is abutted between the conical valve core (7) and the plungers (5), the second through holes (12) are formed in the bottom of the valve sleeve (2), the second through hole (12) is communicated with the annular groove (3), the conical valve core (7) is abutted to the second through hole (12), one side of the valve body (1) is provided with an oil outlet (9) communicated with the annular groove (3), and the bottom of the valve body (1) is provided with an oil inlet (10) communicated with the oil conveying cavity (8).

2. A low-cavitation parallel relief valve according to claim 1, characterised in that: the top of the valve body (1) is provided with a threaded hole (13), an adjusting bolt (14) is in threaded connection with the threaded hole (13), and the lower end of the adjusting bolt (14) extends into the oil conveying cavity (8) and is abutted to the top plate (4).

3. A low-cavitation parallel relief valve according to claim 1, characterised in that: the included angle between the generatrix of the conical section of the conical valve core (7) and the central axis is 30-60 degrees.

4. A low-cavitation parallel relief valve according to claim 1, characterised in that: the diameter of the second through hole (12) is 2-5 mm.

5. A low-cavitation parallel relief valve according to claim 1, characterised in that: the ratio of the diameter of the cylindrical section of the conical valve core (7) to the diameter of the second through hole (12) is 2.5-3.5.

Technical Field

The invention relates to the technical field of hydraulic valves, in particular to a low-cavitation parallel overflow valve.

Background

Relief valves are common hydraulic components used to maintain a constant system pressure. During the operation of the system, the overflow valve is required to bear extremely high pressure difference, so that cavitation jet phenomenon is easily formed at the downstream of the throttling port, and adverse effects such as cavitation, noise, pressure pulsation and the like are caused. The traditional overflow valve is mainly used for improving the cavitation inhibition capability by delaying cavitation initiation, and the cavitation inhibition effect of the traditional overflow valve under the high-intensity cavitation flow condition is poor.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to solve the technical problem of providing a low-cavitation parallel overflow valve, and the parallel overflow valve is provided with a plurality of conical valve cores in parallel, so that the increase of vortex cavitation can be inhibited, the cavitation intensity can be obviously reduced under the high-intensity cavitation flow condition, and meanwhile, the overflow valve can be ensured to have larger flow capacity.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a low parallel overflow valve of cavitation, which comprises a valve body, the valve barrel, the roof, the plunger, compression spring and toper case, the fuel delivery pocket has been seted up in the valve body, the valve barrel sets firmly in the fuel delivery intracavity, the annular has been seted up to the valve barrel side, more than two first through-holes have been seted up at the valve barrel top, first through-hole and annular intercommunication, toper case sliding connection is in first through-hole, the roof sets up in the valve barrel top, and roof and fuel delivery chamber sliding connection, more than two plungers set firmly in the roof bottom, and the plunger pegs graft in first through-hole, there is compression spring the butt between toper case and the plunger, the second through-hole has been seted up to the valve barrel bottom, second through-hole and annular intercommunication, the toper case supports on the second through-hole, the fluid export with the annular intercommunication is seted up to one side of valve body, the fluid entry with the fuel delivery chamber intercommunication is seted up to the valve body bottom.

In a preferred technical scheme of the invention, a threaded hole is formed in the top of the valve body, an adjusting bolt is in threaded connection with the threaded hole, and the lower end of the adjusting bolt extends into the oil transportation cavity and abuts against the top plate.

In a preferred technical scheme of the invention, an included angle between a generatrix of the conical section of the conical valve core and a central axis is 30-60 degrees.

In a preferred technical scheme of the invention, the diameter of the second through hole is 2-5 mm.

In a preferred technical scheme of the invention, the ratio of the diameter of the cylindrical section of the conical valve core to the diameter of the second through hole is 2.5-3.5.

The invention has the beneficial effects that:

according to the low-cavitation parallel overflow valve, the plurality of conical valve cores are arranged in parallel, so that the growth of the vortex cavitation can be inhibited, the cavitation intensity can be obviously reduced under the high-intensity cavitation flow condition, and meanwhile, the overflow valve can be ensured to have larger flow capacity. The invention has simple structure and small processing difficulty, does not involve high-precision mechanical cooperation among parts, reduces the production cost and has stronger practicability.

Drawings

FIG. 1 is a schematic structural diagram of a low-cavitation parallel relief valve according to an embodiment of the present invention;

fig. 2 is a perspective view of the valve housing;

fig. 3 is a simulation comparison diagram of the flow field of the overflow valve provided by the invention and the traditional overflow valve.

In the figure:

1. a valve body; 2. a valve housing; 3. a ring groove; 4. a top plate; 5. a plunger; 6. a compression spring; 7. a conical valve core; 8. an oil conveying cavity; 9. an oil outlet; 10. an oil inlet; 11. a first through hole; 12. a second through hole; 13. a threaded hole; 14. and adjusting the bolt.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1-3, in the embodiment, a low-cavitation parallel overflow valve is provided, which includes a valve body 1, a valve sleeve 2, a top plate 4, a plunger 5, a compression spring 6 and a conical valve core 7, wherein an oil delivery cavity 8 is formed in the valve body 1, the valve sleeve 2 is fixedly arranged in the oil delivery cavity 8, a circular groove 3 is formed in a side surface of the valve sleeve 2, two or more first through holes 11 are formed in a top portion of the valve sleeve 2, the first through holes 11 are communicated with the circular groove 3, the conical valve core 7 is slidably connected in the first through holes 11, the top plate 4 is arranged above the valve sleeve 2, the top plate 4 is slidably connected with the oil delivery cavity 8, the two or more plungers 5 are fixedly arranged at a bottom portion of the top plate 4, the plunger 5 is inserted into the first through holes 11, the compression spring 6 is abutted between the conical valve core 7 and the plunger 5, a second through hole 12 is formed in a bottom portion of the valve sleeve 2, the second through hole 12 is communicated with the circular groove 3, the conical valve core 7 is abutted against the second through hole 12, an oil outlet 9 communicated with the annular groove 3 is formed in one side of the valve body 1, and an oil inlet 10 communicated with the oil conveying cavity 8 is formed in the bottom of the valve body 1. In the embodiment, the central axes of the first through hole 11 and the second through hole 12 are overlapped, when the overflow valve is not used, the conical tip of the conical valve core 7 is abutted in the second through hole 12 under the action of the elastic force of the compression spring 6, so that the second through hole 12 is closed; when the overflow valve is connected into a hydraulic transmission system, high-pressure oil enters the oil conveying cavity 8 through the oil inlet 10, so that the oil pressure in the oil conveying cavity 8 is gradually increased, when the oil pressure exceeds the set pressure of the overflow valve, the oil pushes the conical valve core 7 to overcome the elastic force of the compression spring 6 and move upwards along the first through hole 11, so that the second through hole 12 is opened, the compression spring 6 is compressed at the moment, after the second through hole 12 is opened, the oil in the oil conveying cavity 8 flows back to the oil tank through the second through hole 12 and the oil outlet 9, and meanwhile, the elastic force of the compression spring 6 is increased along with the increase of the opening amount until the elastic force is balanced with the oil pressure, so that the effect of overflow pressure stabilization is achieved.

Specifically, threaded hole 13 is seted up at valve body 1 top, and adjusting bolt 14 and threaded hole 13 threaded connection, and adjusting bolt 14's lower extreme extends to and supports with roof 4 in the oil input chamber 8. When the set pressure of the overflow valve needs to be increased, the adjusting bolt 14 is rotated to drive the top plate 4 to move downwards along the oil conveying cavity 8, the top plate 4 moves downwards to extrude the compression spring 6, the pre-compression amount of the compression spring 6 is increased, and the pressure borne by the conical valve core 7 is increased; conversely, the set pressure of the relief valve can be reduced by rotating the adjusting bolt 14 in the reverse direction.

Specifically, the included angle between the generatrix of the conical section of the conical valve core 7 and the central line is 30-60 degrees. By utilizing the characteristic that the diameter of the conical section of the conical valve core 7 is gradually increased, the high-speed jet flow shows a rapid and gradual diffusion trend when flowing along the surface of the conical section of the conical valve core 7, on one hand, the shear strength of a free shear layer and a wall shear layer of the high-speed cavitation jet flow generated at the outlet at the upper end of the second through hole 12 is rapidly reduced, so that the growth of the cavitation is inhibited, the cavitation strength is reduced, on the other hand, the polymerization effect is inhibited, the cavitation is rapidly dissipated, and the cavitation area is reduced.

Specifically, the diameter of the second through hole 12 is 2-5 mm. Under the condition of the same opening amount, the smaller the diameter of the second through hole 12 is, the larger the cone angle of the conical valve core 7 is, and the more obvious the divergence trend of high-speed jet flow is, so that the strength of vortex cavitation can be obviously reduced, the diameter of the second through hole 12 needs to be set as small as possible, and meanwhile, the plurality of second through holes 12 are formed in parallel at the bottom of the valve sleeve 2, so that the overflow valve can be ensured to have higher flow capacity.

Specifically, the ratio of the diameter of the cylindrical section of the conical valve core 7 to the diameter of the second through hole 12 is 2.5-3.5. When the ratio of the diameter of the cylindrical section of the conical valve core 7 to the diameter of the second through hole 12 is large enough, the shunting phenomenon at the junction of the conical section and the cylindrical section of the conical valve core 7 can be reduced, so that the attachment type cavitation at the junction can be eliminated, the vortex cavitation can be completely dissipated at the upstream of the junction of the conical section and the cylindrical section of the conical valve core 7, and the phenomenon that the vortex cavitation is polymerized due to unstable fluidity when passing through the junction of the conical section and the cylindrical section of the conical valve core 7 and the region, and further the secondary growth effect is induced can be avoided.

In order to illustrate the advantages of the structure, the cavitation inhibition effects of the overflow valve and the traditional overflow valve under the conditions of 0.6mm opening amount and 0.8mm opening amount are contrastingly analyzed through simulating a real flow field, so that a time-averaged liquid phase cloud chart shown in fig. 3 is obtained, and the vortex cavitation generated by the structure is obviously smaller as can be seen by comparing the time-averaged liquid phase cloud charts, namely the cavitation inhibition effect of the overflow valve provided by the invention is obviously better than that of the traditional overflow valve.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.