Directional hydraulic valve

Abstract

The present invention discloses a reversing hydraulic valve, which belongs to the technical field of engineering machinery. It solves the defects of large hydraulic force and poor reversing stability of the conventional reversing valve in the prior art. Its main structure includes a valve body, and the valve body is provided with oil ports A, B, P and T. A rotating valve core is provided in the valve body, and the rotating valve core is connected to the valve body through an end cover. A bearing 1 and a bearing 2 are provided between the rotating valve core and the valve body. A driving device is provided on the end cover, and a driving shaft of the driving device is connected to the rotating valve core. The present invention is mainly used in engineering machinery.

Description

Technical field:

[0002] The present invention belongs to the technical field of engineering machinery, and in particular, relates to a reversing hydraulic valve. Background technology:

[0004] In the prior art, the rotary valve uses the valve core to cut off the oil circuit and realize the joint action of the left and right rotary cylinders; but the speed is low (0.25r / s), and the valve core and the housing have a small clearance. If the speed is high, it will cause direct rotation friction between the valve core and the housing, oil film lubrication problems, and dynamic balance problems. The above three aspects limit the high-speed operation of the rotary valve. The axial movement of the ordinary reversing valve (sliding valve) realizes the closure of the oil circuit. The reversing frequency of the reversing valve used in the hydraulic pipeline or cylinder pulse test is 1Hz, which is low. If the reversing frequency is high, it will lead to problems such as large hydraulic force and poor reversing stability. Summary of the invention:

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a reversing hydraulic valve which can realize high-frequency opening and closing control and has a simple structure and low cost.

[0007] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0008] A reversing hydraulic valve comprises a valve body, on which are provided oil ports A, B, P and T; a rotating valve core is arranged in the valve body, the rotating valve core is connected to the valve body via an end cover, bearings 1 and 2 are arranged between the rotating valve core and the valve body; a driving device is arranged on the end cover, and a driving shaft of the driving device is connected to the rotating valve core.

[0009] Preferably, one end of the valve body is provided with two process holes, and a static seal 2 and a screw plug are installed on the process holes.

[0010] Preferably, a baffle is provided on the outer side of the end cover, and the baffle is connected to the end cover by screws A. A static seal 1 is provided between the valve body and the end cover, and a rotary seal is provided between the rotary valve core and the end cover.

[0011] Preferably, the rotary valve core is provided with a first annular oil channel, a second annular oil channel and a third annular oil channel, and two or more first axial oil grooves and two or more second axial oil grooves are evenly distributed around the periphery of the rotary valve core, the first axial oil grooves and the second axial oil grooves are alternately distributed, the first annular oil channel is connected to the first axial oil groove, and the second annular oil channel is connected to the second axial oil groove.

[0012] Preferably, first oil grooves are symmetrically provided on both sides of the first axial oil groove, and second oil grooves are symmetrically provided on both sides of the second axial oil groove.

[0013] Preferably, a first balancing groove and a second balancing groove are provided on the rotary valve core, and the first balancing groove is connected to the first annular oil channel through a first axial oil groove.

[0014] Preferably, the first annular oil channel is symmetrically provided with a first radial hole and a second radial hole, the third annular oil channel is symmetrically provided with a third radial hole and a sixth radial hole, a second axial hole and a first axial hole are provided inside the rotary valve core, one end of the first annular oil channel is connected to the third annular oil channel through the first radial hole, the first axial hole and the sixth radial hole, and the other end of the first annular oil channel is connected to the third annular oil channel through the second radial hole, the second axial hole and the third radial hole.

[0015] Preferably, a fourth radial hole is provided on the second annular oil channel, a third axial hole and a fifth radial hole are also provided inside the rotary valve core, a leakage oil channel is provided between bearing 1 and the rotary seal, and the second annular oil channel is connected to the leakage oil channel through the fourth radial hole, the third axial hole and the fifth radial hole.

[0016] Preferably, the first annular oil channel in the rotary valve core is connected to the oil port P, the second annular oil channel is connected to the oil port T, the oil port A and the oil port B are distributed on the valve body and the distribution angle between the oil port A and the oil port B is Ø, and the distribution angle Ø=360 / [the number of the first axial oil grooves + the number of the second axial oil grooves].

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can realize high-frequency opening and closing control, and solves the disadvantage of complexity of high-frequency opening and closing axial motion control of sliding valves. The rotary valve core and the valve body are connected by a bearing, which solves the disadvantage of friction between the high-frequency axial motion of sliding valves or the rotary motion valve core and the housing of rotary valves, and has a simple structure and low cost.

[0019] 2. The bearing is lubricated by the leakage of pressure oil. At the same time, the pressure oil forms a lubricating oil film between the rotating valve core and the valve body. The pressure oil in the axial groove and the pressure oil in the annular channel can play the role of static pressure bearing balance support for the rotating valve core. Description of the drawings:

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 A top view of the present invention;

[0023] Figure 3 It is a front view of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the rotary valve core in the present invention;

[0025] Figure 5 for Figure 2 Sectional view of AA in the middle;

[0026] Figure 6 for Figure 3 Cross-sectional view of the middle BB;

[0027] Figure 7 for Figure 2 Cross-sectional view of the middle CC (left position);

[0028] Figure 8 for Figure 2 Cross-sectional view of the middle CC (median view);

[0029] Fig. 9 for Figure 2 Cross-sectional view of the middle CC (right view);

[0030] Fig.10 for Figure 2 Cross-sectional view of the middle CC (center-right position switching);

[0031] Fig.11 It is the hydraulic graphic symbol of the present invention.

[0032] In the figure: 1, valve body; 2, rotary valve core; 3, bearing 1; 4, static seal 1; 5, end cover; 6, screw A; 7, rotary seal; 8, process plug; 9, baffle; 10, bearing 2; 11, static seal 2; 12, screw plug; 13, screw B; 14, drive device; 101, process hole; 201, first annular oil passage; 202, first axial oil groove; 203, first oil groove; 204, second annular oil passage; 205, The third annular oil passage; 206, the third radial hole; 207, the second axial hole; 208, the first axial hole; 209, the third axial hole; 210, the first radial hole; 211, the second radial hole; 212, the fifth radial hole; 213, the fourth radial hole; 214, the leakage oil passage; 215, the sixth radial hole; 217, the second axial oil groove; 218, the second oil groove; 219, the first balancing groove; 220, the second balancing groove. Specific implementation method:

[0034] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] like Figure 1-6As shown in Figures 1 and 11, a reversing hydraulic valve comprises a valve body 1, the valve body 1 is provided with oil ports A, B, P and T, a rotary valve core 2 is provided inside the valve body 1, the rotary valve core 2 is connected to the valve body 1 through an end cover 5, a bearing 1 3 and a bearing 2 10 are provided between the rotary valve core 2 and the valve body 1, a driving device 14 is provided on the end cover 5, and a driving shaft of the driving device 14 is connected to the rotary valve core 2. The driving device 14 may be a motor, or other forms such as an electric motor.

[0037] Embodiment 2:

[0038] A reversing hydraulic valve, wherein one end of the valve body 1 is provided with two process holes 101, a static seal 11 and a screw plug 12 are installed on the process holes 101, and the process holes 101 are used for disassembly of a bearing 10.

[0039] A baffle plate 9 is provided on the outer side of the end cover 5, and the baffle plate 9 is connected to the end cover 5 by screws A6. A static seal 4 is provided between the valve body 1 and the end cover 5, a rotary seal 7 is provided between the rotary valve core 2 and the end cover 5, and the valve body 1 and the end cover 5 are connected by screws B13.

[0040] The rotary valve core 2 is provided with a first annular oil passage 201, a second annular oil passage 204 and a third annular oil passage 205. Two or more first axial oil grooves 202 and two or more second axial oil grooves 217 are uniformly distributed around the rotary valve core 2. The first axial oil grooves 202 and the second axial oil grooves 217 are alternately distributed. The first annular oil passage 201 is connected to the first axial oil groove 202, and the second annular oil passage 204 is connected to the second axial oil groove 217. At this time, the reversing hydraulic valve is an O-type function.

[0041] The first oil grooves 203 are symmetrically arranged on both sides of the first axial oil groove 202, and the second oil grooves 218 are symmetrically arranged on both sides of the second axial oil groove 217. By adding the first oil grooves 203 and the second oil grooves 218, the reversing hydraulic valve has an H-type function.

[0042] The rotary valve core 2 is provided with a first balancing groove 219 and a second balancing groove 220 . The first balancing groove 219 is connected to the first annular oil passage 201 through the first axial oil groove 202 .

[0043] The first annular oil passage 201 is symmetrically provided with a first radial hole 210 and a second radial hole 211, the third annular oil passage 205 is symmetrically provided with a third radial hole 206 and a sixth radial hole 215, the rotary valve core 2 is provided with a second axial hole 207 and a first axial hole 208, one end of the first annular oil passage 201 is connected to the third annular oil passage 205 through the first radial hole 210, the first axial hole 208 and the sixth radial hole 215, and the other end of the first annular oil passage 201 is connected to the third annular oil passage 205 through the second radial hole 211, the second axial hole 207 and the third radial hole 206. Process plugs 8 are provided at the ends of the second axial hole 207 and the first axial hole 208 to prevent leakage.

[0044] The second annular oil passage 204 is provided with a fourth radial hole 213, the interior of the rotary valve core 2 is also provided with a third axial hole 209 and a fifth radial hole 212, a leakage oil passage 214 is provided between the bearing 1 3 and the rotary seal 7, and the second annular oil passage 204 is connected with the leakage oil passage 214 through the fourth radial hole 213, the third axial hole 209, and the fifth radial hole 212. The leaked oil between the bearing 1 3 and the rotary seal 7 returns to the oil tank through the fifth radial hole 212, the third axial hole 209, the fourth radial hole 213, the second annular oil passage 204, and the oil port T of the valve body 1, so as to avoid the high pressure phenomenon caused by the trapped oil of the lubricating oil of the bearings on both sides.

[0045] The first annular oil passage 201 in the rotary valve core 2 is connected to the oil port P, the second annular oil passage 204 is connected to the oil port T, the oil port A and the oil port B are distributed on the valve body 1, and the distribution angle between the oil port A and the oil port B is Ø, and the distribution angle Ø=360 / [the number of the first axial oil grooves 202+the number of the second axial oil grooves 217]. The other parts are the same as those in Example 1.

[0046] The working principle of the present invention is:

[0047] The pressure oil enters the first annular oil passage 201 and the first axial oil groove 202 through the oil port P of the valve body 1, and part of the pressure oil enters the third annular oil passage 205 through the first radial hole 210, the second radial hole 211, the first axial hole 208, the second axial hole 207, the sixth radial hole 215, and the third radial hole 206. The pressure oil in the third annular oil passage 205 forms a static pressure support, and at the same time leaks through the matching clearance between the valve body 1 and the rotating valve core 2 to the second annular oil passage 204, the leakage oil channel 214 between the bearing 1 3 and the rotating seal 7, on the one hand, forming a lubricating oil film between the rotating valve core 2 and the valve body 1, and on the other hand, providing lubrication for the bearing 1 3; at the same time, the pressure oil in the first annular oil passage 201 leaks through the matching clearance between the rotating valve core 2 and the valve body 1 and flows to the left bearing 2 10 to provide lubrication. The lubricating oil leakage of the bearing 2 10 returns to the oil tank through the third axial hole 209, the fourth radial hole 213, the second annular oil passage 204, and the oil port T of the valve body 1.

[0048] When the rotary valve core 2 rotates a certain angle (such as Figure 7 As shown in the left diagram, the three black filled parts are high-pressure oil, and the three blank parts are low-pressure oil). The pressure oil passes through the oil port P of the valve body 1, the first annular oil passage 201 of the rotating valve core 2, and the first axial oil groove 202 to the oil port A of the valve body 1, forming a connection between P and A; at this time, the oil port B of the valve body 1 passes through the second axial oil groove 217 of the rotating valve core 2 and the second annular oil passage 204 to the oil port T of the valve body 1, forming a connection between B and T.

[0049] When the rotary valve core 2 rotates a certain angle (such as Figure 8 As shown in the middle diagram, the pressure oil passes through the oil port P of the valve body 1, the first annular oil passage 201 of the rotating valve core 2, the first axial oil groove 202, and the throttling effect of the first oil groove 203 to the oil port A of the valve body 1, forming a communication between P and A; at the same time, the pressure oil passes through the oil port P of the valve body 1, the first annular oil passage 201 of the rotating valve core 2, the first axial oil groove 202, and the throttling effect of the first oil groove 203 to the oil port B of the valve body 1, forming a communication between P and B.

[0050] At this time, the oil port B of the valve body 1 is connected to the oil port T of the valve body 1 through the second oil groove 218, the second axial oil groove 217 and the second annular oil passage 204 of the rotating valve core 2, forming a connection between B and T; at the same time, the oil port A of the valve body 1 is connected to the oil port T of the valve body 1 through the second oil groove 218, the second axial oil groove 217 and the second annular oil passage 204 of the rotating valve core 2, forming a connection between A and T, so that PABT is connected when in the middle position, forming an H-type function.

[0051] When the rotary valve core 2 rotates a certain angle (such as Fig. 9As shown in the right diagram, the pressure oil passes through the oil port P of the valve body 1, the first annular oil passage 201 of the rotating valve core 2, and the first axial oil groove 202 to the oil port B of the valve body 1, forming a connection between P and B; at this time, the oil port A of the valve body 1 passes through the second axial oil groove 217 of the rotating valve core 2 and the second annular oil passage 204 to the oil port T of the valve body 1, forming a connection between A and T.

[0052] Fig.10 As shown, when the rotary valve core 2 rotates one circle, P / A will be connected n times (B / T will be connected n times) (n is the number of the first axial oil grooves 202), P / A will be cut off n times (B / T will be cut off n times), P / B will be connected n times (A / T will be connected n times) (n is the number of the second axial oil grooves 217), that is, the A / B port will output n times of pressure oil; when the rotation speed of the rotary valve core 2 is changed, the number of P / A / B / T on and off can be changed to achieve high-frequency opening and closing, and the frequency is adjustable. P / A / B / T is an H-type function, which gradually changes during the opening and closing process of the oil port to reduce the impact of instantaneous opening and closing.

Claims

1. A reversing hydraulic valve, comprising a valve body (1), the valve body (1) being provided with an oil port A, an oil port B, an oil port P and an oil port T, a rotary valve core (2) being provided in the valve body (1), the rotary valve core (2) being connected to the valve body (1) via an end cover (5), the valve body (1) and the end cover (5) being connected via a screw B (13), a bearing 1 (3) and a bearing 2 (10) being provided between the rotary valve core (2) and the valve body (1), a driving device (14) being provided on the end cover (5), a driving shaft of the driving device (14) being connected to the rotary valve core (2) The rotary valve core (2) is provided with a first annular oil passage (201), a second annular oil passage (204) and a third annular oil passage (205); two or more first axial oil grooves (202) and two or more second axial oil grooves (217) are evenly distributed around the rotary valve core (2); the first axial oil grooves (202) and the second axial oil grooves (217) are alternately distributed; the first annular oil passage (201) is in communication with the first axial oil grooves (202); the second annular oil passage (204) is in communication with the second axial oil grooves (217); and the invention is characterized in that: First oil grooves (203) are symmetrically provided on both sides of the first axial oil groove (202), and second oil grooves (218) are symmetrically provided on both sides of the second axial oil groove (217); The rotary valve core (2) is provided with a first balancing groove (219) and a second balancing groove (220), and the first balancing groove (219) is connected to the first annular oil channel (201) via a first axial oil groove (202); When the rotary valve core (2) rotates a certain angle, the pressure oil passes through the oil port P of the valve body (1), the first annular oil passage (201) of the rotary valve core (2), the first axial oil groove (202), and the throttling effect of the first oil groove (203) to the oil port A of the valve body (1), forming a mutual communication between P and A; at the same time, the pressure oil passes through the oil port P of the valve body (1), the first annular oil passage (201) of the rotary valve core (2), the first axial oil groove (202), and the throttling effect of the first oil groove (203) to the oil port B of the valve body (1), forming a mutual communication between P and B; At this time, the oil port B of the valve body (1) is connected to the oil port T of the valve body (1) through the second oil groove (218), the second axial oil groove (217) and the second annular oil passage (204) of the rotating valve core (2), forming a connection between B and T; at the same time, the oil port A of the valve body (1) is connected to the oil port T of the valve body (1) through the second oil groove (218), the second axial oil groove (217) and the second annular oil passage (204) of the rotating valve core (2), forming a connection between A and T, so that PABT is connected in the middle position, forming an H-type function.

2. The directional hydraulic valve according to claim 1, characterized in that: One end of the valve body (1) is provided with two process holes (101), and a second static seal (11) and a screw plug (12) are installed on the process holes (101).

3. The directional hydraulic valve according to claim 2, characterized in that: A baffle (9) is provided on the outer side of the end cover (5), and the baffle (9) is connected to the end cover (5). A static seal (4) is provided between the valve body (1) and the end cover (5), and a rotary seal (7) is provided between the rotary valve core (2) and the end cover (5).

4. The reversing hydraulic valve according to claim 3, characterized in that: The first annular oil passage (201) is symmetrically provided with a first radial hole (210) and a second radial hole (211); the third annular oil passage (205) is symmetrically provided with a third radial hole (206) and a sixth radial hole (215); a second axial hole (207) and a first axial hole (208) are provided inside the rotary valve core (2); one end of the first annular oil passage (201) is connected to the third annular oil passage (205) through the first radial hole (210), the first axial hole (208) and the sixth radial hole (215); the other end of the first annular oil passage (201) is connected to the third annular oil passage (205) through the second radial hole (211), the second axial hole (207) and the third radial hole (206).

5. The directional hydraulic valve according to claim 4, characterized in that: A fourth radial hole (213) is provided on the second annular oil passage (204), a third axial hole (209) and a fifth radial hole (212) are also provided inside the rotary valve core (2), a leakage oil passage (214) is provided between the bearing 1 (3) and the rotary seal (7), and the second annular oil passage (204) is connected to the leakage oil passage (214) via the fourth radial hole (213), the third axial hole (209) and the fifth radial hole (212).

6. The directional hydraulic valve according to claim 5, characterized in that: The first annular oil passage (201) in the rotary valve core (2) is connected to the oil port P, the second annular oil passage (204) is connected to the oil port T, the oil port A and the oil port B are distributed on the valve body (1), and the distribution angle between the oil port A and the oil port B is Ø, and the distribution angle Ø=360 / [the number of the first axial oil grooves (202)+the number of the second axial oil grooves (217)].

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