CN214699326U

CN214699326U - Valve core structure of proportional reversing valve

Info

Publication number: CN214699326U
Application number: CN202120267071.3U
Authority: CN
Inventors: 彭敏; 翁明堂; 陈家豪
Original assignee: Hydraulik Power Co ltd
Current assignee: Hydraulik Power Co ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-11-12
Anticipated expiration: 2031-01-29

Abstract

The utility model provides a valve core structure of a proportional reversing valve, belonging to the field of reversing valve manufacturing; the utility model is slidably arranged in the shell, and a high-pressure oil port and at least one working oil port are arranged in the shell; the shell is provided with a slide hole, and the valve core is sleeved in the slide hole and seals the slide hole through the radial surface of the valve core; the valve core slides to enable a gap to be formed between the radial end face of the valve core and the sliding hole, and the gap is used for communicating the high-pressure oil port and the working oil port; when the valve core is positioned at the middle position, the surface of the valve core, which is contacted with the slide hole, is a shoulder sealing surface; the valve core is also provided with a plurality of groups of reducing frustum, and each group of reducing frustum comprises at least two connected circular truncated cones with different slopes; and two sides of the shoulder sealing surface are respectively provided with a group of reducing cones. The utility model is manufactured by a cutting process of the annular slope outside the valve core, and can be directly processed by turning; the valve core adopts a reducing frustum design, and when the valve core slides, the flow area is simple to calculate.

Description

Valve core structure of proportional reversing valve

Technical Field

The utility model relates to a valve manufacturing technology especially relates to a case structure of proportional reversing valve, belongs to hydraulic equipment and makes technical field.

Background

The reversing valve is used as a hydraulic element for controlling the on-off and reversing of an oil path, and is very commonly applied. The common reversing valve is of a slide valve type structure, a valve core of the reversing valve slides in a valve body, and the reversing is realized by switching the valve core, so that different oil ports are communicated or closed.

The opening of the valve core of the proportional reversing valve can be changed along with the change of the control instruction, so that the movement speed of the execution element can be continuously adjusted by adjusting the overflow of the proportional reversing valve, the control is simple and convenient, and the control precision is high; in order to control the flow adjustment, a valve core of the proportional reversing valve is provided with a plurality of throttling grooves, and the flow passing rate of the proportional reversing valve can be continuously adjusted by controlling the opening size of the throttling grooves; the throttling grooves can be designed into various forms such as triangle, U-shaped, rectangle and the like according to different application working conditions, and the cost of the proportional reversing valve is higher due to high processing difficulty and complex processing technology of the throttling grooves; when the throttling groove is designed, the shape of the throttling groove is special, the size of the flow area of the valve core under a certain opening degree is calculated more complicated, the difference between theoretical calculation and actual test is larger, and the development timeliness of the proportional reversing valve is slower.

Therefore, the valve core in the prior art is inconvenient for calculating the flow rate, and the error between the calculation error and the actual application is large.

SUMMERY OF THE UTILITY MODEL

The utility model provides a new case structure of proportional reversing valve through the sealed end face edge design reducing round platform at the case to the case is opened the technical problem that the state lower flow is difficult to the accurate calculation among the solution prior art.

The valve core structure of the proportional reversing valve provided by the embodiment of the utility model is slidably arranged in a shell, a high-pressure oil port and at least one working oil port are arranged in the shell, a slide hole is arranged on the shell, and the valve core is sleeved in the slide hole and seals the slide hole through the radial surface of the valve core; the valve core slides to enable a gap to be formed between the radial end face of the valve core and the sliding hole, and the gap is used for communicating the high-pressure oil port and the working oil port;

when the valve core is positioned at the middle position, the surface of the valve core, which is contacted with the slide hole, is a shoulder sealing surface; the valve core is also provided with a plurality of groups of reducing frustum, and each group of reducing frustum comprises at least two connected circular truncated cones with different slopes; and a group of reducing cones are respectively arranged on two sides of the shoulder sealing surface.

The valve core structure of the proportional directional valve is characterized in that the shoulder sealing surface is provided with a plurality of lubricating oil grooves.

The valve core structure of the proportional directional valve, wherein the reducing circular truncated cone comprises: the first circular truncated cone is tightly connected with the shoulder sealing surface, and the second circular truncated cone is tightly connected with the first circular truncated cone;

the slope of the inclined plane of the second round table is greater than that of the inclined plane of the first round table; the maximum diameter of the first truncated cone is smaller than the diameter of the shoulder sealing surface.

The valve core structure of the proportional directional valve is a bilaterally symmetrical structure and is provided with two axial end faces which correspond to each other.

The valve core structure of the proportional directional valve, wherein the reducing circular truncated cone comprises: a third round table; the third round table is adjacent to the second round table.

The valve core structure of the proportional directional valve is characterized in that two sides of the casing are respectively provided with a control oil path, and two ends of the two control oil paths are respectively contacted with two ends of the valve core.

The valve core structure of the proportional reversing valve comprises a casing, a control oil passage and a control oil passage, wherein the casing is internally provided with two control oil chambers which are respectively connected with the control oil passage; two ends of the valve core are respectively positioned in the two control oil cavities; the control oil way drives the valve core to slide through the control oil cavity;

and a pre-tightening spring which is contacted with the valve core is also arranged in the control oil cavity.

The utility model is manufactured by a circular slope cutting process around the outside of the valve core, can directly adopt turning processing, and has simple manufacturing process; because the valve core adopts the design of the reducing circular truncated cone, when the valve core slides, the flow area of the valve core is simple to calculate, and the flow passing through the valve core can be quickly calculated.

Drawings

Fig. 1 is a schematic cross-sectional view of a valve core structure of a proportional directional valve according to an embodiment of the present invention in a neutral position state;

FIG. 2 is an enlarged view of a portion N of FIG. 1;

fig. 3 is another schematic structural diagram of fig. 2.

Detailed Description

Proportional reversing valve's case structure can adopt following material to make, and be not limited to following material, for example: common components such as a valve core, a hydraulic matching system, an electric control device and the like.

Fig. 1 is a schematic cross-sectional view of a valve core structure of a proportional directional valve according to an embodiment of the present invention in a neutral position state; FIG. 2 is an enlarged view of a portion N of FIG. 1; this embodiment is described with reference to fig. 3.

The valve core structure of the proportional reversing valve provided by the embodiment of the utility model is slidably arranged in a shell 1, a high-pressure oil port P and at least one working oil port (A and B) are arranged in the shell 1, a slide hole 10 is arranged on the shell 1, and a valve core 2 is sleeved in the slide hole 10 and seals the slide hole 10 through the radial surface of the valve core 2; the valve core 2 slides, so that a gap is formed between the radial end face of the valve core 2 and the slide hole 10, and the gap is used for communicating the high-pressure oil port and the working oil port.

Generally, the housing 1 is provided with two slide holes, and the valve core 2 is sleeved in the two slide holes; the valve core 2 slides leftwards or rightwards, and the sliding hole on one side is opened, so that the high-pressure oil port is communicated with one of the working oil ports, and the reversing action is executed.

Generally, the high-pressure oil port is connected to a hydraulic pump in the hydraulic system, and is used for releasing high-pressure hydraulic oil through a high-pressure oil pipe.

The two working oil ports are respectively connected with two ends of the actuating element so as to execute reversing action through the oil inlet and outlet pipes.

As shown in fig. 2 and 3, when the valve core 2 is located at the neutral position, the surface of the valve core 2 contacting the slide hole 10 is a shoulder sealing surface 20; a plurality of groups of reducing conical tables 21 are further arranged on the valve core 2, and each group of reducing conical tables 21 comprises at least two connected round tables (L1 and L2) with different slope slopes; and a group of reducing cones 21 are respectively arranged on two sides of the shoulder sealing surface 20.

Generally speaking, four groups of variable diameter frustum 21 are used for opening P-A, P-B, A-T and B-T respectively, and are used for opening not only the working oil port, but also the oil path between the working oil port and the oil return port T.

In the valve core structure of the proportional directional valve of the present embodiment, a plurality of lubricating oil grooves 25 are formed on each of the shoulder sealing surfaces 20.

Most of the lubricating oil groove 25 corresponds to the sealing surface of the sliding hole, so that the valve core is subjected to the suspension supporting action of oil pressure, the friction force of the movement of the valve core is reduced, and the hydraulic clamping force of the valve core is reduced, so that the valve can be normally reversed when the reversing valve is in a neutral position for a long time and needs to be reversed.

As shown in fig. 2, in the valve core structure of the proportional directional valve of the present embodiment, the reducing circular truncated cone 21 includes: a first truncated cone L1 in intimate contact with said shoulder sealing surface, and a second truncated cone L2 in intimate contact with said first truncated cone;

Because the first round table is cut off around the outer annular slope of the valve core, the structure of the first round table enables the first round table to have a flow guiding effect on the flow of hydraulic oil, and when the valve core is in the reversing process, the flow guiding effect of the throttling groove can effectively improve the flow field of the hydraulic oil, reduce the flow resistance and be beneficial to the reversing stability of the valve core.

In the valve core structure of the embodiment, the slope of the inclined surface of the second circular truncated cone is greater than that of the inclined surface of the first circular truncated cone, so that the valve core structure is suitable for the working condition of firstly slowly actuating and then quickly actuating.

The valve core is manufactured by adopting a circular slope cutting process around the outer circle of the valve core, so that the valve core can be directly machined by turning, and the manufacturing process is simple; because the reducing circular truncated cone is cut off around the outer circular slope of the valve core, when the valve core is displaced and changed rightwards, the through-flow area of the valve core P through A and the through-flow area of the valve core B through T are simple to calculate, and the flow passing through the valve core can be quickly calculated, so that the angle of the circular truncated cone inclined plane can be changed according to different applied working conditions, the width is quickly designed into a proper throttling groove form, and the development and the aging are quick.

Generally, the valve element 2 has a left-right symmetrical structure and has two axial end faces corresponding to each other.

Further, the reducing round platform includes: a third round table; the third round table is adjacent to the second round table. The reducing circular truncated cone 21 can comprise more circular truncated cones with different slopes according to actual needs.

In the valve core structure of the proportional directional valve of the embodiment, two sides of the casing are respectively provided with control oil paths (a and b), and two ends of the two control oil paths are respectively contacted with two ends of the valve core 2.

Specifically, two control oil cavities are arranged in the shell 1 and are respectively connected with the control oil way; two ends of the valve core 2 are respectively positioned in the two control oil cavities; the control oil path drives the valve core 2 to slide through the control oil cavity.

And a pre-tightening spring 8 which is contacted with the valve core is also arranged in the control oil cavity.

When the control cavities a and B have no guide pressure, the valve core is placed in a middle position under the action of a pre-tightening spring, and the oil ports P/A/B/T are not communicated; when the control cavity a has guide pressure, the guide pressure is counterbalanced with the spring, the valve core starts to move rightwards, so that the oil ports P and A are communicated, the oil ports B and T are communicated, and the moving distance is related to the size of the guide pressure of the control cavity a; similarly, when the control cavity B has guide pressure, the oil ports P and B are communicated, and the oil ports A and T are communicated; therefore, the electro-hydraulic proportional directional valve realizes the continuous change of the displacement of the valve core by continuously adjusting the magnitude of the guide pressure of the control cavity.

Additionally, the utility model discloses a case structure cost of manufacture of proportional reversing valve is not high, and structural design is compact, constructs ingeniously, starts the stopping stability, and flow calculation and control are convenient, are applicable to various types of hydraulic system's the implementation of opening or the switching-over action.

The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments. Through the above description of the embodiments, those skilled in the art will clearly understand that the above embodiment method can be implemented by some modifications plus the necessary general technical overlap; of course, the method can also be realized by simplifying some important technical features in the upper level. Based on such understanding, the technical solution of the present invention essentially or the part contributing to the prior art is: the whole function and structure, and cooperate the utility model discloses each embodiment the structure.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A valve core structure of a proportional reversing valve is characterized in that a slide hole is formed in the shell, and the valve core is sleeved in the slide hole and seals the slide hole through the radial surface of the valve core; the valve core slides to enable a gap to be formed between the radial end face of the valve core and the sliding hole, and the gap is used for communicating the high-pressure oil port and the working oil port;

2. The valve core structure of the proportional directional valve according to claim 1, wherein a plurality of oil grooves are provided on each of the shoulder sealing surfaces.

3. The spool structure of a proportional directional valve according to claim 1, wherein the reducing frustum comprises: the first circular truncated cone is tightly connected with the shoulder sealing surface, and the second circular truncated cone is tightly connected with the first circular truncated cone;

4. The valve core structure of the proportional directional valve according to claim 1, wherein the valve core is a left-right symmetrical structure.

5. The spool structure of the proportional directional valve of claim 3, wherein the reducing frustum comprises: a third round table; the third round table is adjacent to the second round table.

6. The spool structure of the proportional directional valve according to any of claims 1 to 3, wherein control oil passages are provided on both sides of the housing, respectively, and both ends of the two control oil passages are in contact with both ends of the spool, respectively.

7. The valve core structure of the proportional reversing valve according to claim 6, wherein two control oil chambers are provided in the housing, and the two control oil chambers are respectively connected to the control oil passages; two ends of the valve core are respectively positioned in the two control oil cavities; the control oil way drives the valve core to slide through the control oil cavity;