CN210240165U

CN210240165U - Hydraulic valve and hydraulic system

Info

Publication number: CN210240165U
Application number: CN201920402625.9U
Authority: CN
Inventors: Shengqin Shao; 邵生勤; Tao Li; 李桃; Hongqiang Pu; 浦红强
Original assignee: Yinchuan Greatwall Hydraulics Co ltd
Current assignee: Yinchuan Greatwall Hydraulics Co ltd
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-04-03
Anticipated expiration: 2029-03-27

Abstract

The utility model discloses a hydraulic valve and a hydraulic system, the hydraulic valve includes upper cover (1), case (2) of passing upper cover (1), valve barrel (3) cup jointed on case (2), support the gliding valve body (4) of case (2) and with lower cover (5) of valve body (4), the inside top-down of valve body (4) is equipped with first shaft hole (41), second shaft hole (42) and third shaft hole (43), be equipped with first buffer structure on valve body (4); the hydraulic system comprises the hydraulic valve, a hydraulic pump, a hydraulic cylinder (6) connected with the hydraulic valve and an oil tank (7). The utility model provides high stability and reliability in the hydrovalve working process have effectively prevented the fluctuation and the impact that the pneumatic cylinder switching-over in-process produced, have improved hydraulic system's stability.

Description

Hydraulic valve and hydraulic system

Technical Field

The utility model relates to a hydraulic control field, concretely relates to hydrovalve and hydraulic system.

Background

The hydraulic servo system makes the output of the system, such as displacement, speed or force, change automatically, quickly and accurately following the change of the input, and at the same time, the output power is greatly amplified. The hydraulic servo system is widely applied to industrial control due to the unique advantages of high response speed, high load rigidity, high control power and the like. The core component of the hydraulic servo system is a hydraulic servo valve.

The common valve core shoulder part of the hydraulic servo valve is generally arranged to be level with a sink groove of a valve body, and the shoulder part of the valve core can generate sudden change of flow in the working process of the servo valve. That is, such an abrupt change in flow rate is caused by an abrupt change in area provided by the linear configuration of the shoulder portion. The structure enables the hydraulic servo valve to easily generate large transmission fluctuation in the working process, and the system is unstable.

Utility model patent application No. 200880012950.9 discloses a pilot valve, include: (a) a valve body having an inlet port, a return port, and a control pressure port in fluid communication with a subsequent valve element; (b) a shaft bore formed in the valve body and in fluid communication with each of the inlet port, a return port, and a control pressure port; (c) a valve spool slidably supported within the axial bore of the valve body, the valve spool configured to control fluid flow through the inlet port, return port, and control pressure port, and when moved, to vary a rate of change of area of at least one of the inlet port and pressure return port, thereby providing a variable resistance to fluid flowing therethrough and reducing a static power of the pilot valve; (d) a displacement device that selectively displaces the spool within the axial bore proximate the inlet, return, and control pressure ports to distribute fluid flow therethrough to provide a desired control pressure to a subsequent valve element.

The utility model discloses a utility model patent application number 201510238990.7 discloses hydraulic servo valve and hydraulic servo system, including valve body and case, two circular bead departments of case all are equipped with a boss.

Above-mentioned utility model patent all is located the case to buffer structure's design, and the impact force that the case received still is higher than the valve body, changes and causes wearing and tearing, leads to the hydrovalve to reveal.

Disclosure of Invention

In order to solve the problem, the utility model provides a hydrovalve and hydraulic system can reduce the impact that the case received, can also effectively reduce and prevent the fluctuation and the impact that the pneumatic cylinder switching-over in-process produced, the utility model discloses both can be applicable to the condition of large-traffic, high speed, also be applicable to small environment. The utility model adopts the following technical scheme:

a hydraulic valve comprises an upper cover, a valve core penetrating through the upper cover, a valve sleeve sleeved on the valve core, a valve body supporting the valve core to slide, and a lower cover located at the lowest part and fixedly connected with the valve body, wherein a first shaft hole, a second shaft hole and a third shaft hole are arranged in the valve body from top to bottom, and a first buffer structure is arranged on the valve body.

The buffer structure is used for enabling the switch change of the valve to be smooth, reducing the impact on the valve core and the valve body and improving the stability of the hydraulic valve.

Preferably, a first buffer structure is respectively arranged between the second shaft hole and the first shaft hole and between the second shaft hole and the third shaft hole, the first buffer structure is a ball, and the valve core is in contact with the ball. Wherein the first shaft hole, the second shaft hole and the third shaft hole are not all located on the same side of the valve core, that is, the first shaft hole, the second shaft hole and the third shaft hole are located on different vertical surfaces. A plurality of shaft holes are formed in the hydraulic valve and are respectively communicated with a T cavity, an A cavity and a P cavity of the hydraulic valve. The chambers are communicated with the hydraulic cylinder to form a stable hydraulic system.

The position of the ball is the position of the control port, and the movement of the valve core drives the ball to roll to control the opening and closing of the control port. When the control port is opened, the cambered surface of the ball can generate a drainage effect on liquid in the hydraulic valve, and the impact force on the valve core is reduced. A ball support structure can be arranged at the ball bearing and used for fixing the ball bearing on one hand and blocking the circulation of fluid in the hydraulic valve on the other hand. The valve body is provided with the buffer structure, so that the impact on the valve core can be reduced, and the abrasion of the valve core is reduced.

Preferably, a second buffer structure is further arranged on the valve core.

Preferably, two shoulder parts on the valve core are respectively provided with a second buffer structure, the second buffer structure is a first buffer section and a second buffer section, and the distance between the first buffer section and the second buffer section is larger than or equal to the aperture of the second shaft hole. That is, when two lands on the valve core are in the middle position, the second shaft hole is just closed, and the valve core at the second shaft hole has the function of simultaneously closing the upper control port and the lower control port or independently closing any control port.

Preferably, the configuration of the first and second buffer sections is a linear configuration or a non-linear configuration or a combination of a linear configuration and a non-linear configuration. Further, the first and second buffer segments include a curvilinear configuration, a tapered configuration, a boss configuration, or the like.

Preferably, the upper cover is fixedly connected with the valve body through a bolt, and the lower cover is fixedly connected with the valve body through a bolt.

A hydraulic system adopts the hydraulic valve. The hydraulic valve with the first buffering structure on the valve body or the hydraulic valve with the first buffering structure on the valve body and the second buffering structure on the valve core is adopted. sheou

Preferably, the hydraulic system further comprises a hydraulic pump and a hydraulic cylinder connected with the hydraulic valve, the hydraulic cylinder comprises a cylinder body, a piston arranged in the cylinder body and a piston rod used for controlling the movement of the piston, and the piston divides the interior of the cylinder body into a hydraulic cylinder upper cavity and a hydraulic cylinder lower cavity which are not communicated with each other; the hydraulic pump is communicated with the upper hydraulic cylinder cavity through a pipeline, and the upper hydraulic cylinder cavity is communicated with the third shaft hole through a pipeline; the lower cavity of the hydraulic cylinder is communicated with the second shaft hole through a pipeline; the first shaft hole is communicated with the oil tank through a pipeline.

Preferably, the piston rod is fixedly connected with the valve body. The piston rod moves up and down to drive the valve body to move, and the two control ports are switched on and off.

When the hydraulic system is used, pressure oil from the hydraulic pump enters the hydraulic system. When the valve core is in the middle position, the two control ports are both in a closed state, and pressure oil does not circulate. When the machine drives the valve core to move upwards, the lower control port is opened, pressure oil filled with the P cavity enters the cavity A from the lower control port, then flows to the lower cavity of the hydraulic cylinder along the second shaft hole and the pipeline, pushes the piston rod to move upwards, and enables the pressure oil in the upper cavity of the hydraulic cylinder to flow back to the P cavity along the pipeline and the third shaft hole. The piston rod drives the valve body to move upwards together, and the lower control port is gradually closed. During this operation, the speed of movement of the piston rod is proportional to the size of the opening of the lower control port.

Similarly, when the valve core moves downwards, the upper control port is opened, pressure oil enters the upper cavity of the hydraulic cylinder and pushes the piston rod to move downwards, so that the pressure oil in the lower cavity of the hydraulic cylinder flows into the cavity A along the pipeline and the second shaft hole, then flows into the cavity T through the upper control port and finally flows into the oil tank along the first shaft hole and the pipeline.

The hydraulic cylinder is fixed, the piston rod is fixedly connected with the valve body, and when the upper control port and the lower control port are opened, the valve body and the piston rod move along with the upper control port and the lower control port to form a hydraulic servo system. Because be equipped with first buffer structure on the valve body of upper and lower control port department or be equipped with first buffer structure on the valve body and be equipped with the second buffer structure on the case, can reduce the impact force that leads to valve body and case to receive because of the control port is opened suddenly greatly, make it open gently or close, improve the stability of system.

The beneficial effects of the utility model reside in that: the stability and the reliability of the hydraulic valve in the working process are improved, the fluctuation and the impact generated in the reversing process of the hydraulic cylinder are effectively prevented, and the stability of a hydraulic servo system is improved.

Drawings

FIG. 1 is a schematic diagram showing the construction of a hydraulic valve in embodiment 1;

FIG. 2 is a schematic diagram showing the construction of a hydraulic valve in embodiment 2;

FIG. 3 is a schematic diagram showing the construction of a hydraulic valve in embodiment 3;

FIG. 4 is a schematic diagram showing the construction of a hydraulic valve in embodiment 4;

FIG. 5 is an enlarged view of a part of the valve body in embodiment 4;

FIG. 6 is a schematic diagram of a hydraulic servo system;

fig. 7 is a schematic view showing a positional relationship between the ball and the ball receiver.

Reference numerals:

1. an upper cover; 2. a valve core; 21. a first buffer section; 22. a second buffer section; 3. a valve housing; 4. a valve body; 41. a first shaft hole; 42. a second shaft hole; 43. a third shaft hole; 440. a ball bearing; 4401. a ball support structure; 441. chamfering; 45. an upper control port; 46. a lower control port; 47. A T-cavity; 48. a cavity A; 49. a P cavity; 5. a lower cover; 6. a hydraulic cylinder; 61. a cylinder body; 611. an upper cavity of the hydraulic cylinder; 612. a lower cavity of the hydraulic cylinder; 62. a piston; 63. a piston rod; 7. and an oil tank.

Detailed Description

The technical solution of the present invention will be described in detail and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the present invention are shown.

Example 1

The embodiment provides a hydraulic valve, as shown in fig. 1, which comprises an upper cover 1, a valve core 2 penetrating through the upper cover 1, a valve sleeve 3 sleeved on the valve core 2, a valve body 4 supporting the sliding of the valve core 2, and a lower cover 5 from top to bottom and from inside to outside. The upper cover 1 is fixedly connected with the valve body 4 through a bolt, and the lower cover 5 is fixedly connected with the valve body 4 through a bolt.

The valve body 4 is provided with a first shaft hole 41, a second shaft hole 42 and a third shaft hole 43 from the top down. First buffer structures are respectively arranged between the second shaft hole 42 and the first shaft hole 41 and between the second shaft hole 42 and the third shaft hole 43, the first buffer structures are balls 440, and the valve core 2 is in contact with the balls 440.

A ball retainer structure 4401 may be further provided at the ball 440, for fixing the ball 440 on one hand, and for blocking the flow of the liquid in the hydraulic valve on the other hand. The positional relationship between the ball 440 and the ball retainer 4401 is shown in fig. 7.

Example 2

The present embodiment is different from embodiment 1 in that, as shown in fig. 2, first buffer structures are respectively provided between the second shaft hole 42 and the first shaft hole 41, and between the second shaft hole 42 and the third shaft hole 43, and the first buffer structures are chamfers 441.

Example 3

The present embodiment is different from embodiment 1 in that the hydraulic valve includes a first damping structure and a second damping structure, as shown in fig. 3. The balls 440 of the first buffer structure are enclosed between the second shaft hole 42 and the first shaft hole 41 and between the second shaft hole 42 and the third shaft hole 43; the second buffer structure includes a first buffer section 21 and a second buffer section 22 provided at two land portions of the spool 2, respectively, and a distance between the first buffer section 21 and the second buffer section 22 is greater than or equal to the bore diameter of the second shaft hole 42.

The configuration of the first buffer section 21 and the second buffer section 22 is a linear configuration or a non-linear configuration or a combination of a linear configuration and a non-linear configuration. In the present embodiment, the first buffer section 21 and the second buffer section 22 are configured in the shape of circular arcs.

Example 4

The present embodiment is different from embodiment 3 in that, as shown in fig. 4, the second relief structure includes a first relief section 21 and a second relief section 22 provided at two land portions of the valve body 2, respectively, and as shown in fig. 5(a), the valve body structure is such that the distance between the first relief section 21 and the second relief section 22 is greater than or equal to the bore diameter of the second shaft hole 42. The configuration of the first buffer section 21 and the second buffer section 22 is a linear configuration or a non-linear configuration or a combination of a linear configuration and a non-linear configuration. As shown in fig. 5(b), in the present embodiment, the first buffer section 21 and the second buffer section 22 are configured in a boss shape.

Example 5

As shown in fig. 6, a hydraulic system, including but not limited to the hydraulic valve described in the above embodiments 1-4, further includes a hydraulic pump, a hydraulic cylinder 6 connected to the hydraulic valve, and an oil tank 7, wherein the hydraulic cylinder 6 includes a cylinder body 61, a piston 62 disposed inside the cylinder body 61, and a piston rod 63 for controlling the movement of the piston 62, and the piston 62 divides the inside of the cylinder body 61 into a cylinder upper chamber 611 and a cylinder lower chamber 612 which are not communicated with each other; the piston rod 63 is fixedly connected with the valve body 4.

The hydraulic pump is communicated with the hydraulic cylinder upper cavity 611 through a pipeline, and the hydraulic cylinder upper cavity 611 is communicated with the third shaft hole 43 through a pipeline; the lower cylinder cavity 612 is communicated with the second shaft hole 42 through a pipeline; the first shaft hole 41 communicates with the oil tank 7 through a pipe.

When the hydraulic system is used, pressure oil from the hydraulic pump enters the hydraulic system. When the spool 2 is at the neutral position, both the upper control port 45 and the lower control port 46 are closed, and the pressure oil does not flow. When the machine drives the valve core 2 to move upwards, the lower control port 46 is opened, and the pressure oil which is filled in the P cavity 49 enters the A cavity 47 from the lower control port 46 and flows to the cylinder lower cavity 612 along the second shaft hole 42 and the pipeline, so that the piston rod 63 is pushed to move upwards, and the pressure oil in the cylinder upper cavity 611 flows back to the P cavity 49 along the pipeline and the third shaft hole 43. The piston rod 43 drives the valve body 4 to move upwards together, and the lower control port 46 is gradually closed. During this operation, the speed of movement of the piston rod 63 is proportional to the size of the opening of the lower control port 46.

Similarly, when the valve core 2 moves downward, the upper control port 45 is opened, and the pressure oil enters the cylinder upper chamber 611, and pushes the piston rod 63 to move downward, so that the pressure oil in the cylinder lower chamber 612 flows into the a chamber 48 along the pipeline and the second shaft hole 42, then flows into the T chamber 47 through the upper control port 45, and finally flows into the oil tank 7 along the first shaft hole 41 and the pipeline.

The hydraulic cylinder 6 is fixed, the piston rod 63 is fixedly connected with the valve body 4, and when the upper control port 45 and the lower control port 46 are opened, the valve body 4 and the piston rod 63 move along with the opening of the upper control port and the lower control port to form a hydraulic servo system. Due to the buffering structures at the upper control port 45 and the lower control port 46, the impact force on the valve body 4 and the valve core 2 can be greatly reduced, so that the valve body and the valve core are opened or closed smoothly, and the stability of the system is improved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A hydraulic valve characterized in that: the valve comprises an upper cover (1), a valve core (2) penetrating through the upper cover (1), a valve sleeve (3) sleeved on the valve core (2), a valve body (4) supporting the valve core (2) to slide, and a lower cover (5) fixedly connected with the valve body (4), wherein a first shaft hole (41), a second shaft hole (42) and a third shaft hole (43) are arranged in the valve body (4) from top to bottom, and a first buffer structure is arranged on the valve body (4).

2. The hydraulic valve according to claim 1, wherein the first buffer structure is a ball (440), and the ball (440) is respectively disposed between the second shaft hole (42) and the first shaft hole (41) and between the second shaft hole (42) and the third shaft hole (43), and the spool (2) is in contact with the ball (440).

3. A hydraulic valve according to claim 1, characterised in that a second damping structure is provided on the spool (2).

4. A hydraulic valve according to claim 3, wherein one of the second cushion structures is provided at each of both land portions on the spool (2), and the second cushion structure includes a first cushion section (21) and a second cushion section (22), and a distance between the first cushion section (21) and the second cushion section (22) is greater than or equal to a bore diameter of the second shaft hole (42).

5. A hydraulic valve according to claim 4, characterized in that the configuration of the first buffer section (21) and the second buffer section (22) is the following structure or a combination thereof: linear configuration, non-linear configuration.

6. A hydraulic valve according to claim 1, characterized in that the upper cover (1) is fixedly connected with the valve body (4) by bolts, and the lower cover (5) is fixedly connected with the valve body (4) by bolts.

7. A hydraulic system, characterized in that a hydraulic valve according to any one of claims 1-6 is used.

8. A hydraulic system according to claim 7, characterized by further comprising a hydraulic pump, a hydraulic cylinder (6) and a tank (7) connected to the hydraulic valve; the hydraulic cylinder (6) comprises a cylinder body (61), a piston (62) arranged in the cylinder body (61) and a piston rod (63) used for controlling the movement of the piston (62); the piston (62) divides the interior of the cylinder body (61) into a hydraulic cylinder upper cavity (611) and a hydraulic cylinder lower cavity (612) which are not communicated with each other; the hydraulic pump is communicated with the hydraulic cylinder upper cavity (611) through a pipeline, and the hydraulic cylinder upper cavity (611) is communicated with the third shaft hole (43) through a pipeline; the hydraulic cylinder lower cavity (612) is communicated with the second shaft hole (42) through a pipeline; the first shaft hole (41) is communicated with the oil tank (7) through a pipeline.

9. A hydraulic system according to claim 8, characterized in that the piston rod (63) is fixedly connected to the valve body (4).