CN214367463U

CN214367463U - Hydraulic valve

Info

Publication number: CN214367463U
Application number: CN202022954115.8U
Authority: CN
Inventors: 杨飞; 赵兴亮; 谢欣武; 王晓虎; 徐翊杰
Original assignee: Weichai Power Co Ltd; Linde Hydraulics China Co Ltd
Current assignee: Weichai Power Co Ltd; Linde Hydraulics China Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-10-08
Anticipated expiration: 2030-12-08

Abstract

The utility model discloses a hydraulic valve relates to hydraulic pressure technical field. The hydraulic valve comprises a motor, a valve body, a main valve core, a driving shaft and a conversion valve core, wherein the main valve core is arranged in the valve body, a plurality of valve ports are formed in the valve body, and the motor is used for driving the main valve core to move relative to the valve body so as to change the communication relation among the valve ports. One end of the driving shaft is connected with the motor, the other end of the driving shaft is in transmission connection with the conversion valve core, the driving shaft can drive the conversion valve core to do linear motion, and the conversion valve core can be abutted against the main valve core to drive the main valve core to move; one end of the valve body is connected with a pilot end cover, a first cavity is arranged in the pilot end cover, the conversion valve core and the main valve core can movably penetrate through the first cavity, and a pilot oil port is formed in the pilot end cover. The hydraulic valve provided by the embodiment can realize motor and hydraulic pilot dual-drive and is flexible to control by connecting the pilot end cover provided with the pilot oil port at one end of the valve body.

Description

Hydraulic valve

Technical Field

The utility model relates to a hydraulic pressure technical field especially relates to a hydraulic valve.

Background

The hydraulic valve is an element used for controlling the pressure, flow and direction of fluid in hydraulic transmission and is a general name of various valves.

The hydraulic valve in the prior art comprises a valve body, a valve core and a nut sleeve, wherein the nut sleeve is coupled with the valve core through threads, and the nut sleeve can drive the valve core to axially move through relative rotation, so that the high-pressure fluid is controlled to flow in and out through the axial movement of a step on the valve core, the function of a directional valve is completed, and an oil cylinder is driven to reciprocate. If the opening size is changed by changing the motor rotation angle, the output flow of the valve can be changed, and the function of the proportional valve is realized; if the opening degree of the valve port is controlled according to the speed and the position detected by the sensor, the accurate control of the speed and the position of the oil cylinder can be realized, and the functions of a proportional valve and a servo valve are completed, so that the aim of one valve with multiple functions is fulfilled. However, the hydraulic valve in the prior art can only adopt a motor to drive the valve core to move axially, and cannot be driven by hydraulic pilot oil.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hydraulic valve, this hydrovalve can realize motor and hydraulic pressure guide's dual drive, and control is nimble.

To achieve the purpose, the utility model adopts the following technical proposal:

a hydraulic valve comprises a motor, a valve body and a main valve core, wherein the main valve core is arranged in the valve body, a plurality of valve ports are formed in the valve body, and the motor is used for driving the main valve core to move relative to the valve body so as to change the communication relation among the valve ports. The switching valve comprises a main valve core, a motor, a switching valve core and a switching valve core, wherein one end of the driving shaft is connected with the motor, the other end of the driving shaft is in transmission connection with the switching valve core, the driving shaft can drive the switching valve core to do linear motion, and the switching valve core can be abutted against the main valve core to drive the main valve core to move; one end of the valve body is connected with a pilot end cover, a first cavity is arranged in the pilot end cover, the conversion valve core and the main valve core can movably penetrate through the first cavity, and a pilot oil port is formed in the pilot end cover.

Optionally, a valve body end cover is arranged at one end of the valve body, which is far away from the pilot end cover, and a second cavity is arranged in the valve body end cover; the two ends of the main valve core are respectively connected with a first elastic piece and a second elastic piece, the first elastic piece is abutted to one end, far away from the valve body, of the first cavity, and the second elastic piece is abutted to one end, far away from the valve body, of the second cavity.

Optionally, a first bearing is mounted on the switching valve core, and the first bearing is fixed to the circumferential direction of the switching valve core through a fastening bolt.

Optionally, the hydraulic valve further includes a first housing, the first housing is disposed at an end of the conversion valve core far away from the pilot end cover, a second bearing is sleeved on the driving shaft, and the second bearing is installed in the first housing.

Optionally, the conversion valve core is a stepped shaft, a first threaded hole is formed in the center of a large shaft of the conversion valve core, a thread is formed in the driving shaft, and the driving shaft is screwed to the large shaft.

Optionally, the small shaft of the conversion valve core is connected with the pilot end cover in a sealing mode.

Optionally, a lip seal is provided between the small shaft of the changeover valve spool and the pilot end cover.

Optionally, the hydraulic valve further includes a lubrication shaft sleeve, the lubrication shaft sleeve is disposed between the small shaft of the conversion valve core and the pilot end cover, and the lubrication shaft sleeve is located on one side of the lip seal away from the large shaft.

Optionally, a vent hole is further disposed on the conversion valve core, and the vent hole is communicated with the first threaded hole.

Optionally, the first bearing is a deep groove ball bearing and the second bearing is a thrust bearing.

The utility model has the advantages that:

the utility model provides a hydrovalve is connected through drive shaft and changeover valve core transmission, and the motor drives the drive shaft rotation, and drive changeover valve core is linear motion to drive main valve core removes, realizes the function of proportional valve and servo valve. A pilot end cover is arranged between the conversion valve core and the valve body, a first cavity is arranged in the pilot end cover, the conversion valve core and the main valve core movably penetrate through the first cavity, a pilot oil port is arranged on the pilot end cover to connect external pilot hydraulic oil with the pilot oil port, and the main valve core is driven to move by controlling the pressure of the pilot oil, so that the function of the reversing valve is realized. The utility model provides a hydrovalve can realize motor and hydraulic pressure guide's dual drive, and control is nimble.

Drawings

Fig. 1 is a schematic structural diagram of a hydraulic valve controlled by a motor according to an embodiment of the present invention;

FIG. 2 is an enlarged view at C of FIG. 1;

fig. 3 is a schematic structural diagram of a hydraulic valve controlled by a hydraulic pilot according to an embodiment of the present invention;

fig. 4 is an enlarged view at D in fig. 3.

In the figure:

1. a motor; 2. a valve body; 3. a main valve element; 4. a drive shaft; 5. a changeover valve core; 6. a pilot end cap; 7. a first elastic member; 8. a second elastic member; 9. a first bearing; 10. a second bearing; 11. a first housing; 12. lip seal; 13. lubricating the shaft sleeve; 14. a motor support; 15. a coupling; 16. a second housing; 17. fastening a bolt; 18. a gasket;

21. a valve body end cover; 31. a first abutment step; 32. a second abutment step; 41. a shaft shoulder; 51. a vent hole; 52. mounting grooves; 53. a first threaded hole; 61. a pilot oil port; 62. a first cavity;

161. an avoidance groove; 211. a second cavity.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1-4, the present embodiment provides a hydraulic valve, which includes a motor 1, a valve body 2, and a main valve element 3, where the main valve element 3 is disposed in the valve body 2, the valve body 2 is provided with a plurality of valve ports, the main valve element 3 is provided with at least two steps for separating the plurality of valve ports, and the motor 1 is configured to drive the main valve element 3 to move relative to the valve body 2, so as to change a communication relationship between the valve ports. Specifically, the valve port includes a valve port P, a valve port a, a valve port B, and a valve port T, through which high-pressure fluid enters between steps of main poppet 3, and flows out from the valve port a or the valve port B to an actuator (such as an oil cylinder, a motor, etc.) along with axial movement of main poppet 3, and hydraulic oil returning from the actuator returns through the valve port a or the valve port B and then returns to an oil tank through the valve port T. It should be noted that the number of the valve ports and the valve core structure of the hydraulic valve are not limited to these, and may be specifically set according to actual conditions. In this embodiment, the motor 1 is a servo motor, but in other embodiments, the motor 1 may be another motor such as a stepping motor.

The hydraulic valve provided by the embodiment further comprises a driving shaft 4 and a conversion valve core 5, wherein one end of the driving shaft 4 is connected with the motor 1, the other end of the driving shaft 4 is in transmission connection with the conversion valve core 5, the driving shaft 4 can drive the conversion valve core 5 to do linear motion, and the conversion valve core 5 can be abutted to the main valve core 3 to drive the main valve core 3 to move; one end of the valve body 2 is connected with a pilot end cover 6, a first cavity 62 is arranged in the pilot end cover 6, the conversion valve core 5 and the main valve core 3 can movably penetrate through the first cavity 62, and a pilot oil port 61 is arranged on the pilot end cover 6. Through drive shaft 4 and conversion case 5 transmission connection, motor 1 drives drive shaft 4 rotatory, and drive conversion case 5 is linear motion to drive main valve core 3 and remove, realize the function of proportional valve and servo valve. One end of the valve body 2 is connected with a pilot end cover 6, a first cavity 62 is arranged in the pilot end cover 6, the conversion valve core 5 and the main valve core 3 can movably penetrate through the first cavity 62, a pilot oil port 61 is arranged on the pilot end cover 6, so that external pilot hydraulic oil is guided into the first cavity 62 through the pilot oil port 61, the main valve core 3 is driven to move by controlling the pilot oil pressure, and the function of the reversing valve is realized. The hydraulic valve provided by the embodiment can realize double driving of the motor 1 and hydraulic pilot, and is flexible to control.

In the present embodiment, as shown in fig. 1, the servo motor 1 is fixed to the motor mount 14, and the servo motor 1 is connected to the drive shaft 4 through the coupling 15. The servo motor 1 rotates according to the control signal, and drives the driving shaft 4 to rotate through the coupler 15. Optionally, the conversion valve core 5 is a stepped shaft, a first threaded hole 53 is formed in the center of a large shaft of the conversion valve core 5, a thread is formed on the driving shaft 4, and the driving shaft 4 is screwed to the large shaft. The driving shaft 4 and the conversion valve core 5 are coupled through threads to convert a rotation angle into axial displacement, the driving shaft 4 drives the conversion valve core 5 to do linear motion, the conversion valve core 5 moves to be abutted against the main valve core 3, the main valve core 3 is driven to move along the axial direction, the step on the main valve core 3 moves to control the inflow and outflow directions of high-pressure fluid, the reversing of the main valve core 3 is realized, and the reciprocating motion of an oil cylinder or the positive and negative rotation functions of a motor are driven.

Because the rotation angle of the servo motor 1 is proportional to the opening degree of the high-pressure fluid inlet and outlet, the output flow of the hydraulic valve can be controlled by controlling the rotation angle of the servo motor 1, and the function of a proportional valve is realized. If the opening of the hydraulic valve is controlled according to the sensor detection signals of the actuating element, such as speed, position, force, moment and the like, accurate control of various parameters of the oil cylinder or the motor can be realized, and the function of a servo valve is realized.

In this embodiment, the hydraulic valve further includes a first housing 11 and a second housing 16, the first housing 11 is disposed at an end of the shift valve core 5 far from the pilot end cover 6, and the shift valve core 5 is disposed in the second housing 16. One end of the first housing 11 is connected to the motor holder 14 by a bolt, the other end is connected to the second housing 16, and the second housing 16 is connected to the pilot end cover 6 by a bolt.

As shown in fig. 1 and 2, in order to balance the axial force and the torque generated by the switching valve core 5, a second bearing 10 is sleeved on the driving shaft 4, and the second bearing 10 is installed in a first housing 11. The conversion valve core 5 is provided with a first bearing 9, and the first bearing 9 is fixed on the outer circumference of the conversion valve core 5 through a fastening bolt 17. In the present embodiment, the first bearing 9 is a deep groove ball bearing, and the second bearing 10 is a thrust bearing.

In the present embodiment, two mounting grooves 52 are formed on the outer circumference of the conversion valve core 5, and each mounting groove 52 is provided with a deep groove ball bearing. A second threaded hole is formed in the mounting groove 52, a screw of the fastening bolt 17 comprises a screw section and a threaded section, the screw section of the fastening bolt 17 penetrates through a central hole of the deep groove ball bearing, a gasket 18 is arranged between the deep groove ball bearing and the conversion valve core 5, and the gasket 18 has supporting and anti-loosening functions. The threaded section of the fastening bolt 17 is in threaded connection with the second threaded hole on the conversion valve core 5 to fix the deep groove ball bearing on the outer circumference of the conversion valve core 5 so as to balance the torque of the drive shaft 4 on the conversion valve core 5. The second housing 16 is correspondingly provided with an avoiding groove 161 to avoid the interference between the deep groove ball bearing and the second housing 16 when the conversion valve core 5 moves linearly in the second housing 16.

The thrust bearing is sleeved on the driving shaft 4, a shaft shoulder 41 is arranged on the driving shaft 4, a mounting hole is formed in the first shell 11, the thrust bearing is arranged in the mounting hole, and the shaft shoulder 41 is used for limiting the thrust bearing so as to balance the axial force of the conversion valve core 5 on the driving shaft 4.

As shown in fig. 3, when the hydraulic valve is driven by a hydraulic pilot, an external pilot hydraulic oil source is connected to the pilot oil port 61, pilot hydraulic oil enters the first cavity 62 from the pilot oil port 61, hydraulic oil entering the first cavity 62 drives the main spool 3 to move axially, and the main spool 3 is driven to generate different displacements by controlling the pressure of the pilot hydraulic oil, so that a function of a reversing valve is realized.

As shown in fig. 3 and 4, in order to prevent the oil in the first chamber 62 from entering the second housing 16 through the switching spool 5, the small shaft of the switching spool 5 is hermetically connected to the pilot end cap 6. In the present embodiment, a lip seal 12 is provided between the small shaft of the switch spool 5 and the pilot end cap 6.

In order to ensure the support and lubrication of the conversion valve core 5, the hydraulic valve further comprises a lubricating shaft sleeve 13, the lubricating shaft sleeve 13 is arranged between the small shaft of the conversion valve core 5 and the pilot end cover 6, and the lubricating shaft sleeve 13 is positioned on one side of the lip seal 12, which is far away from the large shaft.

As shown in fig. 2 and 3, during transmission of the driving shaft 4 and the changeover valve core 5, gas exists between the driving shaft 4 and the bottom of the first threaded hole 53, and in order to avoid the gas from increasing transmission resistance of the driving shaft 4, a vent hole 51 is further formed in the changeover valve core 5, and the vent hole 51 is communicated with the first threaded hole 53. In the present embodiment, the vent hole 51 is provided at the junction of the large shaft and the small shaft of the shift valve body 5, and communicates with the bottom of the first screw hole 53. Such an arrangement minimizes the gas discharge path and facilitates the discharge.

In the embodiment, one end of the valve body 2 away from the pilot end cover 6 is provided with a valve body end cover 21, and a second cavity 211 is arranged in the valve body end cover 21; the two ends of the main valve element 3 are respectively connected with a first elastic part 7 and a second elastic part 8, the first elastic part 7 is abutted against one end of the first cavity 62 far away from the valve body 2, and the second elastic part 8 is abutted against one end of the second cavity 211 far away from the valve body 2. In this embodiment, the first elastic element 7 and the second elastic element 8 are both springs, the two ends of the main valve element 3 are both provided with a first abutting step 31 and a second abutting step 32, the first elastic element 7 and the second elastic element 8 are respectively sleeved at the two ends of the main valve element 3, and one end of the first elastic element 7 close to the valve body 2 abuts against the first abutting step 31; one end of the second elastic member 8 close to the valve body 2 abuts against the second abutment step 32, so that the main spool 3 can be restored under the action of the elastic restoring force of the first elastic member 7 and the second elastic member 8 when no driving force acts.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A hydraulic valve comprises a motor (1), a valve body (2) and a main valve core (3), wherein the main valve core (3) is arranged in the valve body (2), the valve body (2) is provided with a plurality of valve ports, the motor (1) is used for driving the main valve core (3) to move relative to the valve body (2) so as to change the communication relation among the valve ports, the hydraulic valve is characterized by further comprising a driving shaft (4) and a conversion valve core (5), one end of the driving shaft (4) is connected with the motor (1), the other end of the driving shaft is in transmission connection with the conversion valve core (5), the driving shaft (4) can drive the conversion valve core (5) to do linear motion, and the conversion valve core (5) can be abutted against the main valve core (3) so as to drive the main valve core (3) to move; one end of the valve body (2) is connected with a pilot end cover (6), a first cavity (62) is arranged in the pilot end cover (6), the conversion valve core (5) and the main valve core (3) can movably penetrate through the first cavity (62), and a pilot oil port (61) is arranged on the pilot end cover (6).

2. The hydraulic valve according to claim 1, characterized in that one end of the valve body (2) away from the pilot end cover (6) is provided with a valve body end cover (21), and a second cavity (211) is arranged in the valve body end cover (21); the two ends of the main valve core (3) are respectively connected with a first elastic piece (7) and a second elastic piece (8), the first elastic piece (7) is far away from the first cavity (62) in a butt joint mode, and the second elastic piece (8) is far away from the second cavity (211) in a butt joint mode.

3. The hydraulic valve according to claim 1, characterized in that a first bearing (9) is mounted on the switching spool (5), and the first bearing (9) is fixed to the circumference of the switching spool (5) by a fastening bolt (17).

4. The hydraulic valve according to claim 1, further comprising a first housing (11), wherein the first housing (11) is disposed at an end of the switching valve core (5) away from the pilot end cover (6), a second bearing (10) is sleeved on the driving shaft (4), and the second bearing (10) is installed in the first housing (11).

5. The hydraulic valve according to claim 1, characterized in that the switching valve core (5) is a stepped shaft, a first threaded hole (53) is arranged in the center of a large shaft of the switching valve core (5), a thread is arranged on the driving shaft (4), and the driving shaft (4) is screwed on the large shaft.

6. The hydraulic valve according to claim 5, characterized in that the small shaft of the switching spool (5) is in sealed connection with the pilot end cap (6).

7. The hydraulic valve according to claim 6, characterized in that a lip seal (12) is arranged between the small shaft of the shift spool (5) and the pilot end cap (6).

8. The hydraulic valve according to claim 7, further comprising a lubrication sleeve (13), wherein the lubrication sleeve (13) is arranged between the small shaft of the switching spool (5) and the pilot end cap (6), and the lubrication sleeve (13) is located on a side of the lip seal (12) away from the large shaft.

9. The hydraulic valve according to claim 5, characterized in that a vent hole (51) is further arranged on the conversion valve core (5), and the vent hole (51) is communicated with the first threaded hole (53).

10. The hydraulic valve according to claim 3 or 4, characterized in that the first bearing (9) is a deep groove ball bearing and the second bearing (10) is a thrust bearing.