CN214248394U

CN214248394U - Reversing valve capable of preventing oil cylinder from creeping

Info

Publication number: CN214248394U
Application number: CN202120042746.4U
Authority: CN
Inventors: 刘涛; 翁明堂; 邱琳蓁
Original assignee: Hydraulik Power Co ltd
Current assignee: Hydraulik Power Co ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-09-21
Anticipated expiration: 2031-01-08

Abstract

The utility model provides a switching-over valve that grease proofing jar crawled, include: a housing and a valve cartridge; a high-pressure oil port, two different working oil ports and two oil return ports are arranged in the shell; the two working oil ports are respectively arranged on two sides of the high-pressure oil port and are positioned between the two oil return ports; working oil holes are respectively arranged between the high-pressure oil port and the two working oil ports, and an oil return hole is arranged between each working oil port and the adjacent oil return hole; the valve core is sleeved in the shell in a sliding way; the valve core slides to one side to open the working oil hole on the side and open the oil return hole on the other side; two shoulder sealing surfaces are arranged on the valve core; the left side and the right side of each shoulder sealing surface are respectively used for sealing the working oil hole and the oil return hole; when the valve core is in the middle state, the contact area between the shoulder sealing surface and the working oil hole is larger than that between the shoulder sealing surface and the oil return hole. The sealing length of the oil return hole is reduced, so that the current position of an actuating element connected with the working oil port cannot be influenced by hydraulic pressure established by internal leakage, and the oil return hole is very suitable for occasions with requirements on the position of the actuating element.

Description

Reversing valve capable of preventing oil cylinder from creeping

Technical Field

The utility model relates to a valve manufacturing technology especially relates to a switching-over valve that grease proofing jar crawled, 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.

In the application of the reversing valve in the prior art, when a valve core of the reversing valve is in a neutral position, P/A/B/T is not communicated (a high-pressure oil port is not communicated with a working oil port), when internal leakage exists, pressure oil in a main oil way leaks into the working oil port of the reversing valve through an annular sealing gap between the valve core of the reversing valve and a valve body, and because the oil sealing lengths of a valve core step and the oil sealing surface of the valve body are equal, hydraulic pressure collected in a cavity A and a cavity B of the reversing valve is preferably transmitted to a pipeline connected with the working oil port in the circuit and respectively enters a rod cavity and a rodless cavity of an oil cylinder, and different hydraulic pressures are established in the two cavities; because of the area difference of the hydraulic cylinder piston, when the hydraulic pressure built by internal leakage reaches or exceeds the static friction enough to overcome the movement of the oil cylinder, the oil cylinder creeps rightwards, and the hydraulic cylinder is not suitable for the occasions with strict position requirements on the actuating element.

Therefore, a reversing valve capable of preventing the oil cylinder from slowly creeping to the piston side due to the permeation of high-pressure oil when the valve core is in the neutral position for a long time is needed in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a new switching-over valve that grease proofing jar crawled through the sealed length who changes and reduce the oil gallery to solve among the prior art switching-over valve because the high-pressure oil infiltration causes the technical problem that the hydro-cylinder crawled slowly under the meso position state.

The utility model discloses switching-over valve that grease proofing jar crawled, include: a housing and a valve cartridge; a high-pressure oil port, two different working oil ports and two oil return ports are arranged in the shell;

the two working oil ports are respectively arranged on two sides of the high-pressure oil port and are positioned between the two oil return ports; working oil holes are respectively formed between the high-pressure oil port and the two working oil ports, and an oil return hole is formed between each working oil port and the adjacent oil return hole;

the valve core is sleeved in the shell in a sliding way; the valve core slides to one side to open the working oil hole on the side and open the oil return hole on the other side;

two shoulder sealing surfaces are arranged on the valve core; the left side and the right side of each shoulder sealing surface are respectively used for sealing the working oil hole and the oil return hole;

when the valve core is in the middle state, the contact area between the shoulder sealing surface and the working oil hole is larger than that between the shoulder sealing surface and the oil return hole.

The reversing valve for preventing the oil cylinder from crawling comprises a first seal surface, a second seal surface and a third seal surface, wherein the contact surface of the shoulder seal surface and the working oil hole is the first seal surface;

the first sealing surface is provided with a buffer groove; the buffer slot is a groove with a semicircular horizontal section, and one side of the arc of the buffer slot faces the working oil hole.

The reversing valve for preventing the oil cylinder from creeping comprises a first sealing surface, a second sealing surface and a third sealing surface, wherein the first sealing surface is a first sealing surface;

an oil return buffer groove is formed in the second sealing surface; the oil return buffer groove is a groove with a semicircular horizontal section, and one side of the circular arc of the oil return buffer groove faces the working oil hole.

The reversing valve for preventing the oil cylinder from creeping is characterized in that a plurality of lubricating oil grooves are further formed in the two shoulder sealing surfaces.

The reversing valve for preventing the oil cylinder from crawling comprises a first sealing surface, a second sealing surface and a third sealing surface, wherein the edge of the second sealing surface is also provided with an annular slope; the annular slope is of a frustum-shaped structure, and the end with the larger diameter of the annular slope is connected with the second sealing surface.

The reversing valve for preventing the oil cylinder from crawling comprises a shell, wherein two sides of the shell are respectively provided with an electromagnet, and two ends of the two electromagnets are respectively contacted with two ends of a valve core.

The reversing valve for preventing the oil cylinder from creeping comprises a valve core, wherein the valve core is provided with a plurality of electromagnets;

and a pre-tightening spring is also arranged between the driving rod and the valve core.

The reversing valve for preventing the oil cylinder from crawling has the advantages that when an executing element with unequal area is driven (such as an oil cylinder with a piston rod on one side) the sealing area of the oil return hole is smaller; in a shutdown state, once the high-pressure oil port slowly leaks to the working oil port, the high-pressure oil in the working oil port can easily leak to the oil return port, so that the phenomenon of stealing and running of the displacement of the actuating element is avoided and improved, and the stability and reliability of the neutral position of the reversing valve can be effectively ensured.

The utility model discloses a switching-over valve that grease proofing jar crawled has reduced the sealed length of oil gallery to the hydraulic pressure force that makes the executive component who is connected with the working oil port and can not influence its current position because of the internal leakage establishment is applicable to very much and has the occasion of requirement to executive component's position.

Drawings

Fig. 1 is a schematic sectional structure view of a reversing valve for preventing a cylinder from creeping according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a rightward sliding state section of the reversing valve for preventing the oil cylinder from crawling according to the embodiment of the present invention;

FIG. 3 is a schematic view of the valve cartridge of FIG. 1;

fig. 4 is a partially enlarged view of M in fig. 3.

Detailed Description

The switching-over valve that grease proofing jar crawled 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 sectional structure view of a reversing valve for preventing a cylinder from creeping according to an embodiment of the present invention; fig. 2 is a schematic structural view of a rightward sliding state section of the reversing valve for preventing the oil cylinder from crawling according to the embodiment of the present invention; and in conjunction with figures 3 and 4.

The utility model discloses switching-over valve that grease proofing jar crawled, include: a housing 1 and a valve core 2; the hydraulic control system is characterized in that a high-pressure oil port P, two different working oil ports (specifically, a working oil port A and a working oil port B) and two oil return ports T are arranged in the shell 1.

The two working oil ports (A and B) are respectively arranged on two sides of the high-pressure oil port P and are positioned between the two oil return ports T; working oil holes 11 are respectively formed between the high-pressure oil port P and the two working oil ports (A and B), and an oil return hole 12 is formed between each working oil port and the adjacent oil return port.

The valve core 2 is sleeved in the shell 1 in a sliding way; the valve core 2 slides to one side, so that the working oil hole 11 on the side is opened, and the oil return hole 12 on the other side is opened; and P is communicated with A when the hydraulic cylinder slides leftwards, and P is communicated with B when the hydraulic cylinder slides rightwards, so that the high-pressure oil is guided to the working oil port, and the reversing action is executed.

Two shoulder sealing surfaces are arranged on the valve core 2; the left side and the right side of each shoulder sealing surface are respectively used for sealing the working oil hole and the oil return hole;

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

The two working oil ports a and B are respectively connected to two ends of an actuating element (a reversing oil cylinder, in this embodiment, the reversing oil cylinder specifically refers to an oil cylinder having a piston or having two oil cylinders with different areas), so as to perform a reversing action through an oil inlet and outlet pipe.

The return port T is typically connected to a hydraulic tank to facilitate the non-working side of the actuator to drain low pressure oil to the tank. In the working process of the reversing valve, one working oil port is opened, the other working oil port automatically returns oil, and low-pressure oil is discharged into the oil tank.

When no external force acts on the two ends of the valve core, the valve core is in a neutral position, and the oil port P/A/B/T is not communicated at the time; when the P port is connected with a high-pressure oil source, high-pressure oil leaks to the cavity A through the longer axial gap of the first sealing surface, and returns to the cavity T through the shorter axial gap of the second sealing surface, so that the cavity A cannot establish hydraulic pressure for driving the oil cylinder to move.

In the embodiment, when the valve core of the reversing valve is in a neutral position and the A/B/P/T cavity is in a fully-closed state, hydraulic pressure enough for driving the oil cylinder to move cannot be generated in the A cavity and the B cavity even if internal leakage still exists in the valve, so that the phenomenon of oil cylinder crawling is eliminated.

The reversing valve for preventing the oil cylinder from creeping of the embodiment is characterized in that the contact surface of the shoulder sealing surface and the working oil hole 11 is a first sealing surface 21; the first sealing surface 21 is provided with a buffer groove 210; the buffer groove 210 is a groove with a semicircular horizontal cross section, and one side of the arc of the buffer groove 210 faces the working oil hole.

Further, the contact surface of the shoulder sealing surface and the oil return hole 12 is a second sealing surface 22; an oil return buffer groove 220 is arranged on the second sealing surface 22; the oil return buffer groove 220 is a groove with a semicircular horizontal cross section, and one side of the circular arc of the oil return buffer groove 220 faces the working oil hole.

The buffer tank 210 and the oil return buffer tank 220 can avoid pressure impact caused by sudden starting of the reversing valve, the design of the buffer tank is added to the valve core of the reversing valve, the reliability and the service life of the system are improved, and the quality of a final product is improved.

The reversing valve for preventing the oil cylinder from creeping of the embodiment is also provided with a plurality of lubricating oil grooves 25 on two shoulder sealing surfaces. 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, the reversing valve for preventing the oil cylinder from creeping of the embodiment is characterized in that the edge of the second sealing surface is also provided with an annular slope 23; the annular slope 23 is of a frustum-shaped structure, and the end with the larger diameter of the annular slope is connected with the second sealing surface. The annular ramp has a length D that is already horizontally angled C. The horizontal included angle C is generally 10-15 degrees, and the length D is 3-5 mm.

In the process that the valve core moves towards the right side, the small opening is opened on the annular slope 23 of the second sealing surface 22, oil is communicated with the oil return buffer groove through the slope, and oil is drained from the rodless cavity of the oil cylinder; at the moment, the left buffer groove of the first sealing surface on the right side of the shoulder sealing surface is in a critical position and is not opened; the valve core turns right again, and first sealed face is opened, and P and B intercommunication, because the valve core did not commutate this moment and put in place, just communicate through the dashpot, and the flow area of dashpot is less, and the hydro-cylinder removes slowly, and along with the valve core right, the aperture increases, and the hydro-cylinder motion steadily accelerates gradually.

Generally, two sides of the housing 1 are respectively provided with an electromagnet, and two ends of the two electromagnets are respectively contacted with two ends of the valve core 2.

Specifically, the electromagnets are provided with driving rods, and the electromagnets are connected with the end parts of the valve cores through the driving rods;

and a pre-tightening spring is also arranged between the driving rod and the valve core 2. The pretension spring can keep the valve core still at the neutral position under the condition of not receiving external force.

Additionally, the utility model discloses a switching-over valve cost of manufacture that grease proofing jar crawled is not high, and structural design is compact, and the structure is ingenious, starts the stopping stability, uses and maintains the convenience, is applicable to the implementation of the different hydraulic system's of executive component both sides hydraulic pressure lifting surface area switching-over action in the various both sides work hydraulic fluid port.

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 reversing valve for preventing oil cylinders from crawling is characterized by comprising: a housing and a valve cartridge; a high-pressure oil port, two different working oil ports and two oil return ports are arranged in the shell;

2. The reversing valve preventing oil cylinder crawling as claimed in claim 1, characterized in that the contact surface of the shoulder sealing surface and the working oil hole is a first sealing surface;

3. The reversing valve for preventing oil cylinder from crawling as claimed in claim 1, wherein the contact surface of the shoulder sealing surface and the oil return hole is a second sealing surface;

4. The reversing valve preventing oil cylinder crawling as claimed in any one of claims 1 to 3, wherein a plurality of oil grooves are further arranged on two shoulder sealing surfaces.

5. The reversing valve preventing oil cylinder crawling as claimed in claim 3, characterized in that the edge of the second sealing surface is further provided with an annular slope; the annular slope is of a frustum-shaped structure, and the end with the larger diameter of the annular slope is connected with the second sealing surface.

6. The reversing valve for preventing the oil cylinder from crawling as claimed in any one of claims 1 to 3, wherein electromagnets are respectively arranged on two sides of the housing, and two ends of the two electromagnets are respectively in contact with two ends of the valve core.

7. The reversing valve for preventing the oil cylinder from crawling is characterized in that driving rods are arranged on the electromagnets, and the electromagnets are connected with the end portions of the valve cores through the driving rods;