CN215445170U - Valve core structure of proportional reversing valve - Google Patents
Valve core structure of proportional reversing valve Download PDFInfo
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- CN215445170U CN215445170U CN202121140450.2U CN202121140450U CN215445170U CN 215445170 U CN215445170 U CN 215445170U CN 202121140450 U CN202121140450 U CN 202121140450U CN 215445170 U CN215445170 U CN 215445170U
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Abstract
The utility model provides a valve core structure of a proportional reversing valve, belonging to the field of reversing valve manufacturing; the hydraulic oil cylinder 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 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; 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 edge of the two sides of the shoulder sealing surface is provided with a reducing frustum, and the radial surface of the reducing frustum is provided with at least one throttling groove. The reducing cone table is used as a full-circumference flow opening of the valve core, and the throttling groove with the radial opening is arranged on the reducing cone table, so that the reducing cone table is very suitable for application occasions with high flow control requirement under a small opening and low overflow pressure drop under a large opening.
Description
Technical Field
The utility model relates to a valve manufacturing technology, in particular to a valve core structure of a proportional reversing valve, and belongs to the technical field of hydraulic equipment manufacturing.
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 proportional reversing valve has the advantages that the opening degree 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 executing 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 the proportional reversing valve in the prior art, most throttling grooves of a valve core are designed in a non-full-circumference opening mode, such as triangular grooves, U-shaped grooves, semicircular grooves, V-shaped grooves, combinations of different throttling groove modes and the like; the non-full-circumference opening throttling groove has a good throttling control effect and is very common in application; but the non-full-circumference opening throttling groove has complex processing technology, great difficulty, high cost and limited maximum overflow increase; in the application working conditions of the existing proportional reversing valve, the proportional reversing valve is expected to have higher control requirements on the flow under a small opening in most working conditions, the control requirements on the flow under a large opening are not very high, and only the proportional reversing valve is required to have smaller pressure drop when passing through the large flow; although the non-full-circumference opening has a good throttling control effect, the space for improving the large flow rate and having small pressure drop is limited, and the non-full-circumference opening throttling groove is obviously not economical to apply in the occasions with low requirements on large flow rate control under certain working conditions.
Therefore, there is a need in the art for a valve core structure suitable for applications with high flow control requirements under small openings and low overflow pressure drop under large openings.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel valve core structure of a proportional reversing valve, which solves the technical problems of high flow control requirement under a small opening and low overflow pressure drop under a large opening in the throttling control of an application occasion by designing a radial throttling groove and a reducing frustum with an opening at the whole periphery on the edge of a sealing end surface of the valve core.
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 edge of the two sides of the shoulder sealing surface is provided with a reducing frustum, and the radial surface of the reducing frustum is provided with at least one throttling groove.
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 reversing valve comprises a valve core, wherein each group of reducing frustum comprises at least two connected circular truncated cones with different slopes; the circular truncated cones are respectively a first circular truncated cone section and a second circular truncated cone section, and the slope of the second circular truncated cone section is greater than that of the first circular truncated cone section; the first frustum section is located between the shoulder sealing surface and the second frustum section.
The valve core structure of the proportional directional valve, wherein the length of the throttling groove is equal to the sum of the first circular truncated cone section and the second circular truncated cone section.
The valve core structure of the proportional directional valve, wherein when the radial slope of the second circular truncated cone section is 90 degrees, the length of the throttling groove is greater than that of the first circular truncated cone section.
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 valve core structure of the proportional directional valve is characterized in that the cross section of the throttling groove is semicircular, U-shaped, triangular or trapezoidal.
The valve core structure of the proportional reversing valve is characterized in that when the cross section of the throttling groove is triangular, the included angle of the triangle is 30-60 degrees; and the vertex of the triangle is provided with a circular arc transition.
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 reducing cone table is used as a full-circumference flow opening of the valve core, and the throttling groove with the radial opening is arranged on the reducing cone table, so that the reducing cone table is very suitable for application occasions with high flow control requirement under a small opening and low overflow pressure drop under a large opening.
The two-section structure is adopted in the embodiment, the two-section structure is formed by combining a radial throttling groove with a non-full-circumference opening and a reducing frustum (equivalent to the full-circumference opening throttling groove), the throttling control effect of the radial throttling groove is good, and the flow output is stable; the diameter-variable frustum is simple to process and large in flow; the two are combined, so that the application economy is good, the cost is low, and the method is very suitable for application occasions with high flow control requirement under small openings and low overflow pressure drop under large openings; after the valve core section is adopted, the shorter the idle stroke movement time of the main machine is, the better the idle stroke movement time is, and the stable operation of the whole machine can be ensured, so that the working efficiency is improved.
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;
FIG. 2 is an enlarged view of a portion M of FIG. 1;
FIG. 3 is a schematic view of a partial side view of M in FIG. 1;
FIG. 4 is a partial perspective view of a spool structure of the proportional reversing valve of the embodiment of the utility model;
FIG. 5 is a side schematic view of a valve cartridge configuration of a proportional reversing valve according to another embodiment of the present invention;
fig. 6, 7, 8 and 9 are side schematic views of valve core structures of proportional directional valves according to other embodiments of the present invention.
Detailed Description
The valve core structure of the proportional directional valve of the present invention can be made of the following materials, and is not limited to the following materials, 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; FIG. 2 is an enlarged view of a portion M of FIG. 1; this embodiment is described with reference to fig. 3 and 4.
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; the edges of the two sides of the shoulder sealing surface 20 are provided with reducing cones 21, and the radial surface of each reducing cone is provided with at least one throttling groove 22.
Generally, each group of the reducing frustum 21 comprises at least two connected circular truncated cones (X and Y) with different slopes of the inclined surfaces; 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 frustum 21 includes: a first circular truncated cone section X closely connected with the shoulder sealing surface and a second circular truncated cone section Y closely connected with the first circular truncated cone; the first frustum section is located between the shoulder sealing surface and the second frustum section.
The slope of the inclined plane of the second circular platform section is greater than that of the inclined plane of the first circular platform section; the maximum diameter of the first circular land section is slightly smaller than the diameter of the shoulder sealing surface.
In the embodiment, the throttling grooves are not all-round opening throttling grooves, a plurality of (four in the example) throttling grooves can be arranged on the outer circular surface of the valve core according to different working conditions, when the throttling grooves are triangular throttling grooves, the vertex angles of the throttling grooves adopt fillet design, and different overflow quantities can be obtained by changing the fillet radius r, the angle alpha (generally 30-60 degrees) and the depth L of the triangular throttling grooves; the reducing frustum adopts a design of cutting off the outer circle of the valve core in a whole circle, the projection view of the reducing frustum is in a trapezoidal structure, and different overflow is obtained by changing the inclined angle beta of the second frustum section; the length x of the first circular truncated cone section is generally smaller than the length y of the second circular truncated cone section; the length of the throttling groove 22 is equal to the sum of the first circular truncated cone section X and the second circular truncated cone section Y.
When the valve core moves leftwards, the oil way P is communicated with the oil way B, and the oil way A is communicated with the oil way T; when moving to the right, the oil way P is communicated with the oil passage A, and the oil way B is communicated with the oil passage T; when the valve core moves leftwards and in the area of the throttling groove (namely in the area of a first circular table section x of the valve core), an oil inlet P is communicated with a working oil port B through a triangular throttling groove, the oil cylinder is driven to act, return oil of the oil cylinder enters the working oil port A and is communicated with an oil return port T through the throttling groove, the triangular throttling groove is in a non-full-circumference opening form, the overflowing area gain is small, the throttling characteristic is good, when a valve port of the valve core passes through flow, the hydraulic power borne by the valve core is small, the valve core moves stably and displaces, the flow control is accurate, and therefore the oil cylinder can be driven to operate stably, and the whole host can operate stably; when the valve core moves leftwards continuously and moves in the area of the conical throttling groove (namely in the area of the second circular platform section y of the valve core), because the reducing conical platform is in a full-circumference opening form, the flow area gain is larger, and under the same pressure drop, the oil cylinder can be driven to operate at a higher speed through larger flow, the time of load idle stroke movement is shortened, the production efficiency is improved, the energy is saved, and the conical throttling groove is simple to process, low in cost and good in application economy; when the oil cylinder rotates from a fast speed to a slow speed, the valve core can be controlled to move back, so that the valve core moves in the area of the throttling groove, and the oil cylinder is controlled to stably transit when the oil cylinder rotates from the fast speed to the slow speed; when the valve core moves to the right.
As shown in fig. 6 to 9, the throttle groove region may be designed as a U-shaped throttle groove, a semicircular throttle groove, a triangular throttle groove, a trapezoidal throttle groove, etc. according to different working conditions.
According to different working conditions, the area of the reducing frustum throttling groove can pass different flow rates by changing the inclination angle beta of the second circular truncated cone section; as shown in fig. 5, when the angle β is 90 degrees, the flow passing area is the largest; in order to avoid unstable actuation of the oil cylinder caused by large flow change when the first circular platform section X in the throttling area is transited to the second circular platform section y in the throttling area, the inclination angle of the first circular platform section X can be properly increased for transition.
As shown in fig. 5, when the radial slope of the second circular truncated cone segment is 90 degrees, the length of the throttling groove 22 is greater than that of the first circular truncated cone segment.
Generally, the valve element 2 has a left-right symmetrical structure and has two axial end faces corresponding to each other.
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.
In addition, the valve core structure of the proportional reversing valve has low manufacturing cost, compact structural design and ingenious structure, is suitable for application occasions with high flow control requirement under a small opening and low overflow pressure drop under a large opening, and is suitable for the implementation of opening or reversing actions of various hydraulic systems.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits 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 contributing to the prior art is: overall function and construction, and to cooperate with the structure described in the various embodiments of the present invention.
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; while the utility model has been described in detail and with reference to the foregoing embodiments, it will 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; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A valve core structure of a proportional reversing valve is slidably arranged in a shell, and a high-pressure oil port and at least one working oil port are arranged in the shell; 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 edge of the two sides of the shoulder sealing surface is provided with a reducing frustum, and the radial surface of the reducing frustum is provided with at least one throttling groove.
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 valve core structure of the proportional reversing valve according to claim 1, wherein each group of the reducing frustum comprises at least two connected truncated cones with different slopes of the inclined surfaces; the circular truncated cones are respectively a first circular truncated cone section and a second circular truncated cone section, and the slope of the second circular truncated cone section is greater than that of the first circular truncated cone section; the first frustum section is located between the shoulder sealing surface and the second frustum section.
4. The valve spool structure of the proportional reversing valve of claim 3, wherein the length of the throttling groove is equal to the sum of the first circular truncated section and the second circular truncated section.
5. The valve spool structure of the proportional reversing valve of claim 3, wherein when the radial slope of the second land section is 90 degrees, then the length of the throttling groove is greater than the length of the first land section.
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;
and a pre-tightening spring which is contacted with the valve core is also arranged in the control oil cavity.
8. The valve core structure of the proportional reversing valve according to any one of claims 1 to 3, wherein the cross-sectional shape of the throttling groove is semicircular, U-shaped, triangular or trapezoidal.
9. The valve core structure of the proportional directional valve according to claim 8, wherein when the cross-sectional shape of the throttling groove is triangular, the included angle of the triangle is 30-60 degrees; and the vertex of the triangle is provided with a circular arc transition.
10. The valve core structure of the proportional directional valve according to any one of claims 1 to 3, wherein the valve core has a left-right symmetrical structure and has two axial end faces corresponding to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121140450.2U CN215445170U (en) | 2021-05-26 | 2021-05-26 | Valve core structure of proportional reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121140450.2U CN215445170U (en) | 2021-05-26 | 2021-05-26 | Valve core structure of proportional reversing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215445170U true CN215445170U (en) | 2022-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121140450.2U Active CN215445170U (en) | 2021-05-26 | 2021-05-26 | Valve core structure of proportional reversing valve |
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|---|---|
| CN (1) | CN215445170U (en) |
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2021
- 2021-05-26 CN CN202121140450.2U patent/CN215445170U/en active Active
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