CN113803313A

CN113803313A - Multi-way control valve, hydraulic system and engineering machinery

Info

Publication number: CN113803313A
Application number: CN202111275694.6A
Authority: CN
Inventors: 松本哲; 王博; 刘毅; 赵瑜; 潘涛
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2021-12-17

Abstract

The invention provides a multi-way control valve, a hydraulic system and engineering machinery, wherein the multi-way control valve comprises: a valve body; the control valve core is movably arranged in the valve body, a first oil groove and a second oil groove are formed in the control valve core, and the first oil groove and the second oil groove are respectively suitable for oil inlet and oil return; the priority valve core is movably arranged in the valve body, a third oil groove is formed in the priority valve core, and the third oil groove is communicated with the first oil groove through a first flow passage; and the bypass valve core is movably arranged in the valve body, a fourth oil groove is arranged on the bypass valve core, and two ends of the fourth oil groove are communicated with the third oil groove and the second oil groove through a second flow passage and a third flow passage respectively. By the structure, a middle position bypass is not required to be arranged on the control valve core, so that the length of the control valve core can be effectively reduced, the high-pressure deformation resistance and the installation deformation resistance of the control valve core are improved, and the requirements on the channel position machining precision and the valve core hole machining precision in the valve body can be reduced.

Description

Multi-way control valve, hydraulic system and engineering machinery

Technical Field

The invention relates to the technical field of hydraulic control elements, in particular to a multi-way control valve, a hydraulic system and engineering machinery.

Background

At present, the transmission of the engineering machinery is mostly driven by hydraulic pressure. The hydraulic excavator realizes excavation and unloading through single or compound actions of a movable arm, an arm, a bucket and rotation. The engine-driven variable hydraulic pump supplies pressure oil to each valve core in the main valve, and each valve core is provided with a working oil port correspondingly and connected to each actuating mechanism. The multi-way control valve switches the main valve core left and right according to the output signal of the pilot pump, changes the discharge flow of the variable hydraulic pump, provides pressure oil for each actuating mechanism and enables the actuating mechanism to act, and simultaneously discharges the return oil of the actuating mechanism to the oil tank.

The multi-way control valve in the prior art comprises a valve body and a valve core arranged in the valve body, wherein the valve core comprises an oil inlet cutting groove, an oil return cutting groove and a middle bypass, and the length of the valve core is longer (the length-diameter ratio L/D is more than 8.8) due to the structure. The longer valve core can lead to the valve core to have poorer high-pressure deformation resistance and installation deformation resistance, and the requirements on the processing precision of the channel position in the valve body and the processing precision of the valve core hole are higher.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects that the high-pressure deformation resistance and the installation deformation resistance of the multi-way valve in the prior art are poor, and the requirements on the machining precision of the channel position and the valve core hole in the valve body are high, so that the multi-way control valve, the hydraulic system and the engineering machinery are provided.

In order to solve the above problems, the present invention provides a multiplex control valve including: a valve body; the control valve core is movably arranged in the valve body, a first oil groove and a second oil groove are formed in the control valve core, and the first oil groove and the second oil groove are respectively suitable for oil inlet and oil return; the priority valve core is movably arranged in the valve body, a third oil groove is formed in the priority valve core, the third oil groove is communicated with the first oil groove through a first flow passage, and the priority valve core is suitable for controlling the oil inlet pressure of the control valve core; the bypass valve core is movably arranged in the valve body, a fourth oil groove is formed in the bypass valve core, one end of the fourth oil groove is communicated with the third oil groove through a second flow passage, and the other end of the fourth oil groove is communicated with the second oil groove through a third flow passage.

Optionally, the control spool, the priority spool, and the bypass spool are arranged in parallel.

Optionally, the ratio of the length to the diameter of the control spool is in the range of 5 to 7.

Optionally, the multi-way control valve further comprises a check valve core, the check valve core is movably arranged in the valve body, and the check valve core is matched with the first flow channel and is suitable for enabling hydraulic oil to flow from the priority valve core to the control valve core in a one-way mode.

Optionally, the one-way spool, the control spool, the priority spool, and the bypass spool are arranged in parallel.

Optionally, the control valve cores are arranged in parallel, the priority valve cores are arranged in parallel, one priority valve core is correspondingly connected with one control valve core, and the control valve cores are suitable for being connected with different actuators.

Optionally, the third oil groove of each priority valve core is connected with the second flow passage through a corresponding one of the first branch flow passages.

Optionally, the second oil groove of each control valve core is connected with the third flow channel through a corresponding one of the second branch flow channels.

The invention also provides a hydraulic system which comprises the multi-way control valve.

The invention also provides engineering machinery, which comprises the multi-way control valve; or, alternatively, include the hydraulic system described above.

The invention has the following advantages:

by utilizing the technical scheme of the invention, the bypass valve core is independently arranged in the valve body, so that the bypass valve core forms an independent bypass structure. By the structure, a middle position bypass is not required to be arranged on the control valve core, so that the length of the control valve core can be effectively reduced, the high-pressure deformation resistance and the installation deformation resistance of the control valve core are improved, and the requirements on the channel position machining precision and the valve core hole machining precision in the valve body can be reduced. Therefore, the technical scheme of the invention overcomes the defects that the high-pressure deformation resistance and the installation deformation resistance of the multi-way valve in the prior art are poor, and the requirements on the machining precision of the channel position in the valve body and the machining precision of the valve core hole are high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic diagram of the multiplex control valve of the present invention;

FIG. 2 is a schematic diagram of a manifold of the multiplex control valve of FIG. 1; and

fig. 3 is a schematic cross-sectional view of a manifold of the multiplex control valve of fig. 1.

Description of reference numerals:

10. a valve body; 20. a control valve core; 21. a first oil groove; 22. a second oil groove; 30. a priority valve spool; 31. a third oil groove; 40. a first flow passage; 50. a bypass spool; 51. a fourth oil groove; 60. a second flow passage; 70. a third flow path; 80. a one-way valve core; 90. a first branch flow channel; 100. and a second branch flow channel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and 2, a multiple control valve of the present embodiment includes a valve body 10, a control spool 20, a priority spool 30, and a bypass spool 50. Wherein, the movably setting of control valve core 20 is provided with first oil groove 21 and second oil groove 22 on the control valve core 20 in valve body 10, and first oil groove 21 and second oil groove 22 are suitable for oil feed and oil return respectively. The priority valve spool 30 is movably disposed in the valve body 10, and a third oil groove 31 is provided in the priority valve spool 30, and the third oil groove 31 communicates with the first oil groove 21 through a first flow passage 40. The priority spool 30 is adapted to control the oil intake amount of the control spool 20. The bypass valve member 50 is movably disposed in the valve body 10, the bypass valve member 50 is provided with a fourth oil groove 51, and both ends of the fourth oil groove 51 are respectively communicated with the third oil groove 31 and the second oil groove 22 through a second flow passage 60 and a third flow passage 70.

By using the technical solution of the present embodiment, the bypass valve core 50 is separately disposed in the valve body 10, so that the bypass valve core 50 forms an independent bypass structure. The structure enables the control valve core 20 not to be provided with a middle bypass, thereby effectively reducing the length of the control valve core 20, improving the high-pressure deformation resistance and the installation deformation resistance of the control valve core 20, and reducing the requirements of the channel position processing precision and the valve core hole processing precision in the valve body 10. Therefore, the technical scheme of the embodiment overcomes the defects that the high-pressure deformation resistance and the installation deformation resistance of the multi-way valve in the prior art are poor, and the requirements on the machining precision of the channel position in the valve body and the machining precision of the valve core hole are high.

The first flow passage 40, the second flow passage 60, and the third flow passage 70 are all passage structures formed in the valve body 10.

The control valve body 20 in the present embodiment is used for connection to a cylinder of an actuator. Further, the first oil groove 21 and the second oil groove 22 are connected to the rodless chamber and the rod chamber of the cylinder, respectively. The hydraulic oil can flow from the first oil groove 21 to the cylinder, and at the same time, the return oil of the cylinder flows back to the oil tank through the second oil groove 22. Those skilled in the art will appreciate that by varying the position of the control valve spool 20 within the valve body 10, the extending and retracting action of the cylinder can be controlled.

It should be noted that the priority spool 30 is adapted to regulate the inlet pressure of the control spool 20. As will be understood by those skilled in the art with reference to fig. 2 and 3, the flow area of the first flow passage 40 can be changed by adjusting the position of the priority valve spool 30 in the valve body 10, so as to adjust the oil inlet pressure of the control valve spool 20 and achieve the effect of priority distribution of hydraulic oil.

It should be noted that the bypass valve core 50 is used to control whether the hydraulic oil enters the priority valve core 30 or not, and to play a throttling effect on the oil inlet. As will be understood by those skilled in the art in conjunction with fig. 1, the bypass spool 50 has a communication position, a shut-off position, and a throttle position when moving within the valve body 10. When the bypass spool 50 is in the communicating position, the second flow passage 60 and the third flow passage 70 are communicated, and the intake oil flows directly back to the tank through the bypass spool 50. When the bypass valve core 50 is at the stop position, the second flow passage 60 and the third flow passage 70 are blocked, and the inlet oil enters the priority valve core 30 and then enters the control valve core 20. When the bypass valve core 50 is at the throttling position, the oil inlet part enters the priority valve core 30 and then enters the control valve core 20, and the rest part flows back to the oil tank through the bypass valve core 50, so that the throttling effect is achieved.

As will be understood by those skilled in the art with reference to fig. 1 and 2, the sides of the control valve spool 20, the priority valve spool 30, and the bypass valve spool 50 are provided with a return spring and a proportional solenoid valve, so as to realize gear control of the three valve spools.

As shown in fig. 3, in the solution of the present embodiment, the control spool 20, the priority spool 30, and the bypass spool 50 are arranged in parallel.

Preferably, in the present embodiment, the ratio of the length to the diameter of the control spool 20 is in the range of 5 to 7. Specifically, because the control valve core 20 is no longer provided with a middle bypass, the ratio of the length to the diameter of the control valve core 20 can be changed to be as small as possible, so that the high-pressure deformation resistance and the installation deformation resistance of the control valve core 20 are improved, and the requirements on the machining precision of the channel position and the machining precision of the valve core hole in the valve body 10 can be reduced.

The specific values of the ratio of the length to the diameter of the control spool 20 can be selected by those skilled in the art according to the actual needs.

As shown in fig. 1 to 3, in the solution of the present embodiment, the multi-way control valve further includes a check valve core 80, the check valve core 80 is movably disposed in the valve body 10, and the check valve core 80 is matched with the first flow passage 40 and is adapted to allow hydraulic oil to flow from the priority valve core 30 to the control valve core 20 in a single direction. Specifically, the check spool 80 makes the hydraulic oil flow in one direction from the priority spool 30 to the control spool 20, and prevents the hydraulic oil from flowing backward. Further, a return spring is provided between the end surface of the check valve spool 80 and the valve body 10.

As shown in fig. 3, in the present embodiment, the check valve spool 80, the control valve spool 20, the priority valve spool 30, and the bypass valve spool 50 are arranged in parallel.

As shown in fig. 1, in the solution of the present embodiment, the control valve core 20 and the priority valve core 30 are provided in parallel, the plurality of control valve cores 20 are adapted to be connected to different actuators, and the plurality of control valve cores 20 and the plurality of priority valve cores 30 are connected in one-to-one correspondence. Specifically, a plurality of control spools 20 are arranged in parallel, and the first oil groove 21 of each control spool 20 is connected to one priority spool 30 through the first flow passage 40. In the present embodiment, three control spools 20 are provided, and the three control spools 20 are respectively used for connecting with the boom cylinder, the arm cylinder, and the swing motor. Of course, the specific number of the control valve cores 20 can be adjusted by those skilled in the art according to actual conditions, and the control valve cores 20 can be used for connecting with driving cylinders of various actuators.

Preferably, the three control spools 20 in this embodiment are arranged in parallel.

As shown in fig. 1, in the present embodiment, the third oil grooves 31 of the priority valve bodies 30 are connected to the second flow passage 60 through the first branch flow passage 90. That is, in the present embodiment, the oil intakes of the plurality of control spools 20 are arranged in parallel. Meanwhile, by adjusting the positions of the different priority valve cores 30 in the valve body 10, the control valve cores 20 can be adjusted to have different oil inlet pressures, so that the technical effect of preferentially distributing hydraulic oil is achieved.

As shown in fig. 1, in the present embodiment, the second oil grooves 22 of the plurality of control valves 20 are connected to the third flow channel 70 through the second branch flow channel 100. That is, the bypass spool 50 may control the intake of oil to the plurality of control spools 20.

The first branch flow passage 90 and the second branch flow passage 100 are both passage structures formed in the valve body 10.

The embodiment also provides a hydraulic system which comprises the multi-way control valve.

The embodiment also provides engineering machinery, which comprises the multi-way control valve; or, alternatively, include the hydraulic system described above.

According to the above description, the present patent application has the following advantages:

1. provides a brand-new hydraulic valve structure and principle, and has reasonable configuration and simple channel. The size of the ratio of the length to the diameter of the valve core to the valve hole is greatly reduced, and the reliability and the operability are greatly improved;

2. the problems that the operation performance is reduced along with the deformation of a high-pressure reversing valve main body and the applicable condition of electronic control fluctuates are solved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A multiplex control valve, comprising:

a valve body (10);

the control valve core (20) is movably arranged in the valve body (10), a first oil groove (21) and a second oil groove (22) are formed in the control valve core (20), and the first oil groove (21) and the second oil groove (22) are suitable for oil inlet and oil return respectively;

the priority valve core (30) is movably arranged in the valve body (10), a third oil groove (31) is formed in the priority valve core (30), the third oil groove (31) is communicated with the first oil groove (21) through a first flow passage (40), and the priority valve core (30) is suitable for controlling the oil inlet pressure of the control valve core (20);

the bypass valve core (50) is movably arranged in the valve body (10), a fourth oil groove (51) is formed in the bypass valve core (50), one end of the fourth oil groove (51) is communicated with the third oil groove (31) through a second flow passage (60), and the other end of the fourth oil groove (51) is communicated with the second oil groove (22) through a third flow passage (70).

2. The multiplex control valve of claim 1, wherein said control spool (20), said priority spool (30), and said bypass spool (50) are disposed in parallel.

3. The multiplex control valve of claim 1, wherein the ratio of the length to the diameter of said control spool (20) is in the range of 5 to 7.

4. The multiple control valve according to claim 1, further comprising a check valve spool (80), the check valve spool (80) being movably disposed within the valve body (10), the check valve spool (80) cooperating with the first flow passage (40) and adapted to provide one-way communication of hydraulic oil from the priority valve spool (30) to the control valve spool (20).

5. The multiplex control valve of claim 4, wherein said check spool (80), said control spool (20), said priority spool (30), and said bypass spool (50) are disposed in parallel.

6. The multiplex control valve according to claim 4, wherein said control spool (20) is provided in plurality in parallel, said priority spool (30) is provided in plurality, one said priority spool (30) and one said control spool (20) are correspondingly connected, and a plurality of said control spools (20) are adapted to be connected to different actuators.

7. The multiplex control valve according to claim 6, wherein said third oil groove (31) of each of said priority spools (30) is connected to said second flow passage (60) through a corresponding one of said first branch flow passages (90).

8. The multiple control valve according to claim 6, wherein the second oil groove (22) of each control spool (20) is connected to the third flow passage (70) through a corresponding one of the second branch flow passages (100).

9. A hydraulic system comprising a multiplex control valve as defined in any one of claims 1 to 8.

10. A working machine comprising a multiplex control valve according to any one of claims 1 to 8; or, comprising a hydraulic system according to claim 9.