CN214247839U

CN214247839U - External leakage type reversing valve

Info

Publication number: CN214247839U
Application number: CN202120042747.9U
Authority: CN
Inventors: 刘涛; 陈家豪
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 an outward-leakage reversing valve, belonging to the field of reversing valve manufacturing; the method comprises the following steps: a housing and a valve cartridge; a high-pressure oil port, an oil return port and two different working oil ports are arranged in the shell; the shell is provided with two sliding holes, and the valve core is sleeved in the two sliding holes; the valve core 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; the surface of the slide hole, which is in contact with the valve core, is a radial sealing surface; an annular oil groove is arranged on the radial sealing surface; an oil return pipe is arranged between the annular oil groove and the oil return port and is communicated with the annular oil groove and the oil return port through the oil return pipe; an electric control valve is arranged on the oil return pipe. The internal leakage oil on the high-pressure oil port side is led out of the valve body through the annular oil groove arranged on the valve body, is leaked out and directly returns to the oil tank or serves as control oil of other hydraulic components, so that the executing element connected with the working oil port cannot influence the current state of the executing element due to the internal leakage hydraulic oil, the executing element can be suitable for occasions requiring the position of the executing element, the energy is reasonably utilized, and the waste is reduced.

Description

External leakage type reversing valve

Technical Field

The utility model relates to a valve manufacturing technology especially relates to an external leakage type switching-over 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 slide valve is a reversing valve which realizes the closing and reversing of an oil path by the axial movement of a valve core in a valve body, and is the valve which is most widely applied in a hydraulic system. A gap of 5-10 μm is allowed between a valve body and a spool of the spool type direction valve, so that so-called internal leakage occurs at a seal between adjacent flow passages in the valve body, which is inevitable in the spool type direction valve. If the working oil port is connected with the executing element, the existing position of the executing element can be changed along with the pressure establishment caused by the continuous accumulation of internally leaked hydraulic oil, and the method cannot be applied to occasions with strict position requirements on the executing element;

therefore, there is a need in the art for a reversing valve that prevents high pressure oil from penetrating into the work area and that efficiently utilizes and recovers the leaked oil.

SUMMERY OF THE UTILITY MODEL

The utility model provides a new type of leaking switching-over valve through the high pressure oil collecting and water conservancy diversion annular oil groove exudes to solve among the prior art switching-over valve and cause the unusual technical problem of execute component action because of high pressure oil infiltration.

The utility model discloses leak type switching-over valve, include: a housing and a valve cartridge; a high-pressure oil port, an oil return port and two different working oil ports are arranged in the shell;

the shell is provided with two sliding holes, and the valve core is sleeved in the two sliding holes; the valve core 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;

the surface of the slide hole, which is in contact with the valve core, is a radial sealing surface; an annular oil groove is arranged on the radial sealing surface; an oil return pipe is arranged between the annular oil groove and the oil return port and is communicated with the annular oil groove and the oil return port through the oil return pipe;

an electric control valve is arranged on the oil return pipe.

The leakage type reversing valve as described above, wherein a portion of the valve element that contacts the radial seal surface is a shoulder;

and when the valve core is in a non-sliding state, each shoulder seals the two working oil ports respectively.

The two ends of the shell are respectively provided with the oil return cavities, and the two oil return cavities are respectively connected with the oil return port.

The leakage type reversing valve is characterized in that two oil guide channels are further arranged in the shell; each annular oil groove is communicated with the oil return pipe through one oil guide channel.

The leakage type reversing valve is characterized in that 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 the valve core;

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.

The leakage type reversing valve is characterized in that the electric control valve is electrically connected with the electromagnet, and the electric control valve is closed when the electromagnet is started.

The leakage type reversing valve is characterized in that the electric control valve is a normally open type electric control one-way valve.

The high-pressure oil port of the outward-leakage reversing valve of the utility model is sealed by the valve core, and in the working process or the shutdown state, the high-pressure oil preferably enters the annular oil groove after permeating outwards through the axial direction of the valve core; the internal leakage oil on the high-pressure oil port side is led out of the valve body through the annular oil groove arranged on the valve body, is leaked out and directly returns to the oil tank or serves as control oil of other hydraulic components, so that the executing element connected with the working oil port cannot influence the current state of the executing element due to the internal leakage hydraulic oil, the executing element can be suitable for occasions requiring the position of the executing element, the energy is reasonably utilized, and the waste is reduced.

Drawings

Fig. 1 is a schematic cross-sectional view of an external leakage type directional control valve according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1 in a rightward reversing state;

fig. 3 is a partially enlarged view of fig. 2.

Detailed Description

The formula of leaking switching-over valve 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 an external leakage type directional control valve according to an embodiment of the present invention; FIG. 2 is a schematic sectional view of the right-hand side of the switch; and in conjunction with figure 3.

The utility model discloses leak type switching-over valve, include: a housing 1 and a valve core 2; a high-pressure oil port P, an oil return port T and two different working oil ports (a working oil port a and a working oil port B, respectively) are arranged in the housing 1.

The shell 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 P is communicated with one of the working oil ports; 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.

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 with two ends of an actuating element (such as a reversing oil cylinder) so as to execute reversing action through an oil inlet pipe and an oil 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.

The surface of the slide hole, which is in contact with the valve core 2, is a radial sealing surface; an annular oil groove 30 is arranged on the radial sealing surface; an oil return pipe 3 is arranged between the annular oil groove 30 and the oil return port T, and the annular oil groove and the oil return port T are communicated through the oil return pipe 3; an electric control valve 4 is arranged on the oil return pipe 3.

In the leak-out type directional control valve of the present embodiment, a portion of the valve element 2 that contacts the radial seal surface is a shoulder; and when the valve core is in a non-sliding state, each shoulder seals the two working oil ports respectively.

The formula of leaking switching-over valve that leaks of this embodiment, wherein, the both ends of casing 1 are respectively for returning oil chamber (being left side oil chamber Ta and right side oil chamber Tb respectively), two it respectively with to return oil chamber the oil return port links to each other. The left oil return cavity Ta and the right oil return cavity Tb are communicated with the oil outlet T

In the external leakage type reversing valve of the present embodiment, two oil guide channels 31 are further provided in the housing 1; each annular oil groove 30 is communicated with the oil return pipe 3 through one oil guide channel 31. Generally, the opening diameter of the annular oil groove 30 is the smallest, and the diameter of the oil guide passage 31 is slightly larger.

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 9, and the electromagnets are connected with the end parts of the valve cores 2 through the driving rods 9;

and a pre-tightening spring 8 is also arranged between the driving rod 9 and the valve core 2. The biasing spring 8 can keep the valve element in a neutral position without receiving an external force.

Preferably, the electric control valve 4 is electrically connected with the electromagnet, and when the electromagnet is started, the electric control valve 4 is closed.

Generally, the electric control valve 4 is a normally open type electric control one-way valve.

In a normal state of the reversing valve, due to the axial clearance, the seeped hydraulic oil flows back to the oil tank through the oil duct arranged outside the reversing valve body due to the high-pressure hydraulic oil at the P port, and does not seep to the A/B port of the reversing valve body, so that the position of the oil cylinder connected with the A/B port cannot be changed, and the reversing valve is very suitable for occasions with strict requirements on the stop position of the oil cylinder.

As shown in fig. 2, when the left side of the valve core is subjected to a hydraulic pressure or an electromagnetic force, the coil of the electric control valve 4 is energized at the same time, so that the electric control valve 4 is closed, the valve core moves towards the right side, the oil paths are P → B, a → T, and the right annular oil groove is filled with hydraulic oil rapidly; because the outlet of the annular oil groove at the left side is positioned between the shoulder surfaces of the valve core, and the electric control valve 4 is closed, hydraulic oil at the port P cannot directly flow back to the oil tank through the electric control valve 4, and therefore the flow and the pressure required by the driving oil cylinder cannot be influenced.

When the right side of the valve core is subjected to electromagnetic force, the valve core moves towards the left side, and the working mode is the same as the above.

The utility model discloses a switching-over valve body, through to structural design, with the internal leakage oil of high pressure oil port side through the annular oil groove that sets up on the valve body, outside leading to the valve body, do and leak directly get back to the oil tank, or as the control oil of other hydraulic components and parts, the executive component who is connected with the working fluid port like this can not influence its current state because of the hydraulic oil of inside seepage, can be applicable to the occasion that has the requirement to executive component's position, reasonable utilization the energy again, it is extravagant to reduce.

And simultaneously, the utility model discloses an external leakage type switching-over valve makes the switching-over valve can extra discharge infiltration's high-pressure oil in the non-working process, has improved the reliability and the working life of system, has promoted the quality of final product.

Additionally, the utility model discloses an it is not high that the formula of leaking switching-over valve cost of manufacture is not, and structural design is compact, constructs ingeniously, starts the stopping stability, uses and maintains the convenience, is applicable to the implementation of various types of hydraulic system's 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. An external bleed type directional control valve, comprising: a housing and a valve cartridge; a high-pressure oil port, an oil return port and two different working oil ports are arranged in the shell;

an electric control valve is arranged on the oil return pipe.

2. The leak-off diverter valve according to claim 1 wherein the portion of the spool in contact with the radial seal surface is a shoulder;

3. The externally leaking type directional control valve according to claim 1, wherein the two ends of said housing are respectively provided with oil return chambers, and the two oil return chambers are respectively connected with said oil return ports.

4. The externally venting reversing valve of claim 1, wherein two oil conducting passages are further provided in the housing; each annular oil groove is communicated with the oil return pipe through one oil guide channel.

5. The externally leaking type reversing valve according to any one of claims 1 to 3, wherein electromagnets are respectively provided on both sides of the housing, and both ends of the two electromagnets are respectively in contact with both ends of the valve element;

6. The leak-type directional control valve as set forth in claim 5, wherein said electrically controlled valve is electrically connected to said solenoid, and wherein when said solenoid is activated, said electrically controlled valve is closed.

7. The leak-out reversing valve according to claim 1, wherein the electrically controlled valve is a normally open electrically controlled check valve.