阅读说明：本技术 一种补偿阀 (Compensation valve ) 是由 王翔 叶鹏飞 李玮斌 于 2021-08-12 设计创作，主要内容包括：本发明提供了一种补偿阀,属于机械技术领域。它解决了现有补偿阀油路连通时冲击较大的问题。本补偿阀,包括阀体、阀套和阀芯,阀体一侧具有凹腔,阀套连接在所述凹腔的开口处,阀芯设置于凹腔内,阀芯的外壁和阀套的内壁相贴靠,阀体内还具有进油容腔、出油容腔以及LS油道,阀套侧部与LS油道对应处贯穿开设有LS连通孔,阀芯内具有与进油容腔相连通的输油通道,阀芯内位于输油通道的出油口的侧壁上具有凹入的斜槽,斜槽位于输油通道的出油口一侧,斜槽相对于所述阀芯的轴线倾斜开设且斜槽沿阀芯轴向的宽度自外向内逐渐缩小,所述阀芯能沿轴向向所述阀套方向移动并使所述输油通道与所述LS连通孔相连通。本补偿阀能避免瞬间启闭时的冲击。(The invention provides a compensating valve, and belongs to the technical field of machinery. The problem that the impact is large when an oil way of an existing compensating valve is communicated is solved. The compensating valve comprises a valve body, a valve sleeve and a valve core, wherein a concave cavity is formed in one side of the valve body, the valve sleeve is connected to an opening of the concave cavity, the valve core is arranged in the concave cavity, the outer wall of the valve core is attached to the inner wall of the valve sleeve, an oil inlet cavity, an oil outlet cavity and an LS oil duct are further arranged in the valve body, an LS communication hole is formed in the position, corresponding to the LS oil duct, of the side portion of the valve sleeve in a penetrating mode, an oil conveying channel communicated with the oil inlet cavity is formed in the valve core, a concave inclined groove is formed in the side wall, located at the oil outlet of the oil conveying channel, of the valve core and located on one side of the oil outlet of the oil conveying channel, the inclined groove is formed in an inclined mode relative to the axis of the valve core, the inclined groove is gradually reduced from outside to inside along the axial width of the valve core, and the valve core can move towards the direction of the valve sleeve along the axial direction and enables the oil conveying channel to be communicated with the LS communication hole. The compensating valve can avoid impact during instantaneous opening and closing.)

1. A compensating valve comprises a valve body (1), a barrel-shaped valve sleeve (2) and a cylindrical valve core (3), wherein a concave cavity (4) is formed in one side of the valve body (1), the opening of the valve sleeve (2) is connected to the opening of the cavity (4) towards the bottom of the cavity (4), the valve core (3) is arranged in the cavity (4), one end of the valve core (3) extends into the valve sleeve (2), the outer wall of the valve core (3) is attached to the inner wall of the valve sleeve (2), an oil inlet cavity (5), an oil outlet cavity (6) and an LS oil duct (7) are further arranged in the valve body (1), an LS communication hole (8) is formed in the position, corresponding to the LS oil duct (7), of the side portion of the valve sleeve (2), an oil conveying channel communicated with the oil inlet cavity (5) is formed in the valve core (3), and the oil outlet of the oil conveying channel is located on the outer side face of the valve core (3), the oil-saving valve is characterized in that a concave chute (11) communicated with the oil delivery channel is arranged on the side wall of an oil outlet of the oil delivery channel in the valve core (3), the chute (11) is positioned on one side, close to the opening of the cavity (4), of the oil outlet of the oil delivery channel, the chute (11) is obliquely arranged relative to the axis of the valve core (3), the chute (11) is gradually reduced from outside to inside along the axial width of the valve core (3), and the valve core (3) can move towards the valve sleeve (2) along the axial direction and enables the oil delivery channel to be communicated with the LS communication hole (8).

2. The compensating valve of claim 1, wherein the oil delivery channel comprises a concave hole (9) which is formed by inwards recessing one end face of the valve core (3) facing the bottom of the concave cavity (4) and an oil passing hole (10) which penetrates through the side part of the valve core (3), the oil passing hole (10) is communicated with the concave hole (9), the ratio of the axial width of one end of the inclined groove (11) close to the oil outlet of the oil delivery channel along the valve core (3) to the aperture of the oil passing hole (10) is greater than 1, and the other end of the inclined groove (11) extends to the side wall of the oil passing hole (10).

3. A compensation valve as claimed in claim 1 or 2, characterized in that the side wall of the chute (11) on the side close to the opening of the housing (4) is curved.

4. A compensating valve as claimed in claim 1 or 2, characterised in that the spool (3) is of one-piece construction.

5. The compensating valve according to claim 2, wherein a plurality of small holes (12) are radially perforated at the opposite position of the side part of the valve core (3) and the oil outlet cavity (6), the small holes (12) are circumferentially and uniformly distributed on the valve core (3), and the oil inlet cavity (5) is always communicated with the oil outlet cavity (6) through the concave hole (9) and the small holes (12).

6. A compensation valve according to claim 2, characterized in that the inner wall of the valve housing (2) comprises a sealing surface (13) and an expansion surface (14) which are all cylindrical, the sealing surface (13) and the expansion surface (14) are coaxially and adjacently arranged, the diameter of the expansion surface (14) is larger than that of the sealing surface (13), the expansion surface (14) is closer to the opening position of the cavity (4) than the sealing surface (13), the outer wall of the valve core (3) is abutted against the sealing surface (13), the valve core (3) can axially move until the oil passing hole (10) is opposite to the expansion surface (14), and the LS communication hole (8) is opened at the expansion surface (14).

7. A compensating valve as claimed in claim 1 or 2, characterized in that the end face of the valve member (3) at the end which projects into the valve housing (2) is provided with a protruding cylindrical abutment portion (15), the diameter of the abutment portion (15) being smaller than the outer diameter of the valve member (3) at other positions, the abutment portion (15) being capable of abutting against the bottom surface of the inner side of the valve housing (2) when the valve member (3) is displaced.

8. The compensating valve according to claim 7, wherein a blocking portion (16) protruding in an annular shape is arranged on a side wall of the cavity (4) in the valve body (1), the valve element (3) is arranged in the blocking portion (16) in a penetrating manner, the oil inlet cavity (5) and the oil outlet cavity (6) are respectively located on two sides of the blocking portion (16), a protruding retaining shoulder (17) is arranged on a side wall of the valve element (3) opposite to the oil outlet cavity (6), and when the valve element (3) is far away from the valve sleeve (2), the retaining shoulder (17) can abut against the blocking portion (16).

9. A compensation valve as claimed in claim 1 or 2, characterized in that the valve housing (2) is in threaded connection with the valve body (1), a recessed annular sealing groove (18) is provided on the outside of the valve housing (2), an O-ring (19) and a retaining ring (20) are provided in the sealing groove (18), and the O-ring (19) and the retaining ring (20) are abutted against the side wall of the cavity (4).

Technical Field

The invention belongs to the technical field of machinery, and relates to a compensating valve.

Background

The pressure compensation valve is widely applied in the field of engineering machinery, for example, an excavator comprises basic actions such as a movable arm, an arm, a bucket, a bulldozing, a slewing and a whole machine walking, in order to improve the working efficiency in an actual working condition, composite operation of a plurality of basic actions is often needed, high-pressure oil is provided for a plurality of execution elements through a hydraulic reversing valve by the flow provided by a hydraulic pump, when the maximum flow provided by the hydraulic pump is smaller than the total flow required by a system, the hydraulic oil preferentially flows to the execution elements with lower pressure, and the execution elements with higher load pressure reduce the speed or stop moving.

Chinese patent discloses a pressure compensating valve, application number: 201710939580.4, respectively; the publication number is as follows: CN 107605835A; the pressure compensation valve comprises a valve body and a valve sleeve arranged on the valve body, wherein the valve body is provided with an oil inlet cavity and an oil outlet cavity, the oil inlet cavity is communicated with an LS flow channel, a compensation valve core is movably arranged in the valve sleeve, the lower end of the compensation valve core is provided with a valve core, the compensation valve core moves up and down to enable the oil inlet cavity and the LS flow channel to be communicated or disconnected, and the valve core is opened or closed to enable the oil inlet cavity and the oil outlet cavity to be communicated or disconnected.

However, in the use process of the pressure compensation valve, when the oil inlet containing cavity is communicated or disconnected with the LS flow passage, fluid flows out or is disconnected instantaneously, the impact on the compensation valve and external parts is large, and the controllability is poor.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides a compensating valve and solves the problem that the existing compensating valve has large impact when an oil way is communicated.

The purpose of the invention can be realized by the following technical scheme:

a compensating valve comprises a valve body, a barrel-shaped valve sleeve and a columnar valve core, wherein a concave cavity is formed in one side of the valve body, the opening of the valve sleeve is connected to the opening of the cavity towards the bottom of the cavity, the valve core is arranged in the cavity, one end of the valve core extends into the valve sleeve, the outer wall of the valve core is attached to the inner wall of the valve sleeve, an oil inlet cavity, an oil outlet cavity and an LS oil duct are further formed in the valve body, an LS communication hole is formed in the position, corresponding to the LS oil duct, of the side portion of the valve sleeve in a penetrating mode, an oil conveying channel communicated with the oil inlet cavity is formed in the valve core, the oil outlet of the oil conveying channel is located on the outer side face of the valve core, a concave chute communicated with the oil conveying channel is formed in the side wall of the oil outlet of the oil conveying channel, and the chute is located on one side, close to the opening of the cavity, of the oil outlet of the oil conveying channel, the inclined groove is obliquely formed relative to the axis of the valve core, the width of the inclined groove along the axial direction of the valve core is gradually reduced from outside to inside, and the valve core can move towards the direction of the valve sleeve along the axial direction and enables the oil delivery channel to be communicated with the LS communication hole.

When the compensating valve is used, the valve core can move relative to the valve sleeve and the valve body along the self axial direction under the change of oil pressure at the oil inlet cavity, the oil outlet cavity and the LS oil duct, and an oil delivery channel on the moved valve core can be communicated with or blocked by the LS communication hole on the valve sleeve and further communicated with or blocked by the LS oil duct on the valve body. In the communicating process, one side of the oil outlet of the oil conveying channel of the compensating valve, which is close to the opening of the concave cavity, is provided with the chute, so that the caliber of the oil outlet is enlarged, the communicating area of the oil way is gradually increased from zero in the moving process of the valve core, the slope is smaller, the chute which is formed in the inclined way plays a certain buffering transition role, and the impact caused by instantaneous opening and closing is avoided.

In a foretell compensating valve, the oil delivery passageway includes the case orientation the one end terminal surface of cavity bottom is to the recessed shrinkage pool of indent and runs through the oilhole of crossing of seting up at the case lateral part, cross the oilhole with the shrinkage pool is linked together, the chute is close to the one end edge of the oil-out of oil delivery passageway the ratio of case axial width and the aperture of crossing the oilhole is greater than 1, and the chute other end extends to on the lateral wall of crossing the oilhole. The opening at the oil passing hole is enlarged by at least one time by the arrangement of the inclined groove, so that the communication time of the oil conveying channel and the LS communication hole in the moving process of the valve core is greatly prolonged, and the impact of instantaneous communication of oil caused by over-small oil outlet of the oil conveying channel is effectively avoided.

In the above compensating valve, the side wall of the chute near the opening of the cavity is an arc surface. Through the design of arcwall face, can further cushion for the fluid that passes through, reduce the impact.

In one of the above compensating valves, the spool is of a unitary construction. The valve core of the integrated structure is convenient to process and install.

In the above compensating valve, the lateral part of the valve core and the opposite part of the oil outlet cavity are radially penetrated and provided with a plurality of small holes, the small holes are uniformly distributed on the valve core along the circumferential direction, and the oil inlet cavity is always communicated with the oil outlet cavity through the concave hole and the small holes. The oil inlet cavity and the oil outlet cavity are communicated all the time through the concave hole and the small hole, so that oil pressure at the oil inlet cavity and the oil outlet cavity is quickly balanced when two actions are combined, the response speed is shortened, and the purposes of quick response and priority performance are achieved.

In the above compensation valve, the inner wall of the valve sleeve includes a sealing surface and an expansion surface, which are both cylindrical, the sealing surface and the expansion surface are coaxially and adjacently arranged, the diameter of the expansion surface is larger than that of the sealing surface, the expansion surface is closer to the opening position of the cavity than the sealing surface, the outer wall of the valve core is attached to the sealing surface, the valve core can axially move to the oil passing hole and is opposite to the expansion surface, and the LS communication hole is formed in the expansion surface. In the axial movement process of the valve core, when the oil outlet of the oil delivery channel is opposite to the sealing surface, the oil outlet is blocked by the sealing surface, the oil delivery channel is cut off, when the oil outlet moves to be opposite to the expansion surface with larger diameter along with the valve core, the inner wall of the valve sleeve does not block the oil outlet any more, and the oil delivery channel is communicated with the LS communication hole. The on-off control of the oil way is realized through the design of the stepped inner wall structure, the structure is simple, and the processing is convenient.

In the compensation valve, a protruding cylindrical abutting part is arranged on the end face of one end, extending into the valve sleeve, of the valve core, the diameter of the abutting part is smaller than the outer diameters of other positions of the valve core, and the abutting part can abut against the bottom surface of the inner side of the valve sleeve when the valve core moves. The valve core is limited in the moving direction by the abutting of the bottom surface and the abutting part on the inner side of the valve sleeve, the structure is simple, and oil can flow conveniently.

In the above compensation valve, a protruding annular blocking portion is arranged on the side wall of the cavity in the valve body, the valve element is arranged in the blocking portion in a penetrating mode, the oil inlet cavity and the oil outlet cavity are located on two sides of the blocking portion respectively, a protruding blocking shoulder is arranged on the side wall, opposite to the oil outlet cavity, of the valve element, and when the valve element is far away from the valve sleeve, the blocking shoulder can abut against the blocking portion. The position of the valve core far away from the valve sleeve is limited by the matching of the blocking part and the blocking shoulder, and the valve core is ensured to move in the effective stroke.

In the above compensation valve, the valve sleeve is in threaded connection with the valve body, the outer side of the valve sleeve is provided with a recessed annular sealing groove, an O-shaped ring and a check ring are arranged in the sealing groove, and the O-shaped ring and the check ring are abutted against the side wall of the cavity. O type circle and retaining ring set up simultaneously in a seal groove, can guarantee sealed effect, even if long-term the use, also can carry out effectual sealed.

Compared with the prior art, the compensation valve has the advantages that the mode that the inclined groove is obliquely arranged on one side of the oil hole enables the communicating area of the oil line to be gradually increased from zero in the communicating process of the oil line, the slope is small, the inclined groove arranged in the inclined groove plays a certain buffering transition role, and the impact caused by instantaneous opening and closing is avoided.

Drawings

Fig. 1 is a schematic sectional structure view of the compensating valve.

Fig. 2 is a schematic sectional view of the compensating valve with the valve core abutting against the valve sleeve.

In the figure, 1, a valve body; 2. a valve housing; 3. a valve core; 4. a concave cavity; 5. an oil inlet cavity; 6. an oil outlet cavity; 7. an LS oil passage; 8. LS communication hole; 9. concave holes; 10. an oil passing hole; 11. a chute; 12. a small hole; 13. a sealing surface; 14. expanding the surface; 15. an abutting portion; 16. a blocking portion; 17. a shoulder block; 18. a sealing groove; 19. an O-shaped ring; 20. a retainer ring; 21. and (4) large pores.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the compensating valve includes a valve body 1, a cylindrical valve sleeve 2 and a cylindrical valve core 3, wherein a recessed cavity 4 is formed in one side of the valve body 1, an opening of the valve sleeve 2 is connected to an opening of the cavity 4 in a threaded manner towards the bottom of the cavity 4, a recessed annular sealing groove 18 is formed in the outer side of the valve sleeve 2, an O-ring 19 and a check ring 20 are arranged in the sealing groove 18, the O-ring 19 and the check ring 20 are abutted against the side wall of the cavity 4, and the valve core 3 is arranged in the cavity 4.

Specifically, an oil inlet cavity 5, an oil outlet cavity 6 and an LS oil passage 7 are further formed in the valve body 1, the oil inlet cavity 5 is located at the bottom of the concave cavity 4, and the oil outlet cavity 6 is located between the oil inlet cavity 5 and the LS oil passage 7. The side wall of the concave cavity 4 in the valve body 1 is provided with a protruding blocking part 16 in a circular ring shape, the oil inlet cavity 5 and the oil outlet cavity 6 are respectively positioned at two sides of the blocking part 16, and the valve core 3 is arranged in the blocking part 16 in a penetrating mode. The side wall of the valve core 3 opposite to the oil outlet cavity 6 is provided with a convex annular blocking shoulder 17, and when the valve core 3 is far away from the valve sleeve 2, the blocking shoulder 17 can abut against the blocking part 16 for limiting. One end of the valve core 3, which faces the valve sleeve 2, extends into the valve sleeve 2, and the end face of the end of the valve core 3 is provided with a protruding cylindrical abutting part 15, the diameter of the abutting part 15 is smaller than the outer diameters of other positions of the valve core 3, and the abutting part 15 can abut against the bottom surface of the inner side of the valve sleeve 2 when the valve core 3 moves, so that the limiting in the other direction is realized.

An LS communication hole 8 is formed in the side portion of the valve sleeve 2 corresponding to the LS oil duct 7 in a penetrating mode, a concave hole 9 communicated with the oil inlet containing cavity 5 is formed in one end, facing the bottom of the concave cavity 4, of the valve core 3, an oil passing hole 10 is formed in the side portion of one end, extending into the valve sleeve 2, of the valve core 3 in a penetrating mode in the radial direction, and the oil passing hole 10 is communicated with the concave hole 9. The side wall of the valve core 3 at the outer end of the oil passing hole 10 is provided with a concave inclined groove 11 communicated with the oil passing hole 10, the inclined groove 11 is obliquely arranged relative to the radial direction of the valve core 3, the inclined groove 11 is positioned at one side of the oil passing hole 10 close to the opening of the cavity 4, and the width of the inclined groove 11 along the axial direction of the valve core 3 is gradually reduced from outside to inside. In this embodiment, the ratio of the width of the inclined groove 11 near the oil outlet of the oil delivery channel along the axial direction of the valve core 3 to the aperture of the oil passing hole 10 is greater than 1, and the other end of the inclined groove 11 extends to the side wall of the oil passing hole 10.

The inner wall of the valve sleeve 2 comprises a sealing surface 13 and an expansion surface 14 which are cylindrical, the sealing surface 13 and the expansion surface 14 are arranged coaxially and adjacently, the diameter of the expansion surface 14 is larger than that of the sealing surface 13, the expansion surface 14 is closer to the opening position of the cavity 4 than the sealing surface 13, the outer wall of the valve core 3 is attached to the sealing surface 13, and the valve core 3 can move axially to the oil passing hole 10 and is opposite to the expansion surface 14.

The lateral part of the valve core 3 is radially penetrated and provided with a plurality of small holes 12 opposite to the oil outlet cavity 6, the oil inlet cavity 5 is communicated with the oil outlet cavity 6 through a concave hole 9 and the small holes 12, and the small holes 12 are uniformly distributed around the central axis of the valve core 3. The side part of one end of the valve core 3 close to the bottom of the concave cavity 4 is also provided with a plurality of large holes 21 in a penetrating way along the radial direction, the oil inlet cavity is communicated with the concave hole 9 through the large holes 21, and the large holes 21 are uniformly distributed around the axis of the valve core 3. In the embodiment, the valve core 3 is of an integrated structure, the number of the large holes 21 and the small holes 12 is four, the aperture of the large hole 21 is larger than that of the small holes 12, and the specific number can be increased or decreased according to the requirement; the outer diameter of one end of the valve core 3 close to the bottom of the concave cavity 4 is larger than that of the other end of the valve core 3, and the complete area of one end of the valve core 3 close to the valve sleeve 2 is smaller than that of the other end of the valve core 3 because the valve core 3 is cylindrical.

In the using process of the compensating valve, the valve core 3 can move relative to the valve sleeve 2 and the valve body 1 along the self axial direction under the change of oil pressure at the oil inlet cavity 5, the oil outlet cavity 6 and the LS oil duct 7, and the oil passing hole 10 on the moved valve core 3 can be communicated with or blocked by the LS communication hole 8 on the valve sleeve 2, so as to be communicated with or blocked by the LS oil duct 7 on the valve body 1. In the communicating process, because the inclined groove 11 is arranged at one side, close to the opening of the cavity 4, of the outer end of the oil passing hole 10 of the compensating valve, the communicating area of an oil way is gradually increased from zero in the moving process of the valve core 3, the slope is small, and the inclined groove 11 formed in an inclined mode plays a certain buffering transition role, so that the impact caused by instantaneous opening and closing is avoided.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.