Compact high-pressure large-flow two-position five-way hydraulic valve and assembling method thereof

Abstract

The present application belongs to hydraulic technology field, disclose a kind of compact high-pressure large flow two-position five-way hydraulic valve and its assembling method, hydraulic valve includes valve body and valve core, valve core can be moved between left position and right position of valve body transversely;Valve body is radially provided with I system upstream port, I system downstream port, I system oil return port, II system oil return port, load A port and load B port, one end of valve body axially is provided with II system control port, and spring is arranged between the other end of valve body and valve core;Valve core is axially provided with first large ring cavity, small ring cavity and second large ring cavity.The leakage between two systems is changed to internal leakage of system itself by the design of 1 seal in valve sleeve and valve core internal leakage channel, the goal of "zero leakage" between systems can be achieved;The connecting mode between valve body and pipe joint is simple, the reliability of product pipe joint connection is increased, and the safety of product is improved.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic technology and relates to a high-pressure, high-flow, two-position, five-way hydraulic transmission valve, specifically a compact high-pressure, high-flow, two-position, five-way hydraulic valve and its assembly method. Background Technology

[0002] Hydraulic transmission, with its significant advantages such as high power density and fast response speed, is widely used in many fields such as engineering machinery and aerospace. The two-position five-way control valve is the core component for controlling the switching of a hydraulic actuator from the main system to the backup system in an emergency. When its control port switches from the low-pressure oil circuit of the backup system to the high-pressure oil circuit, the two-position five-way control valve simultaneously disconnects both working ports of the hydraulic actuator from the high-pressure and low-pressure oil circuits of the main system. Then, it switches to the low-pressure oil circuit of the backup system.

[0003] As the pressure of hydraulic systems increases, continuing to use traditional spool valve structures, such as those described in the invention patent CN11895135A, to switch oil circuits will inevitably fail to meet the stringent requirements of "low leakage" or even "zero leakage" between the main and backup systems, as the sealing between the various oil circuits relies solely on the gaps between the valve core and valve sleeve. Furthermore, to meet the requirements of high pressure and high flow, continuing to use conventional threaded or flanged connections between the valve body and pipe fittings will typically increase the connection size to enhance connection strength, contradicting the design goals of miniaturization and weight reduction of hydraulic components. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a compact high-pressure, high-flow two-position five-way hydraulic valve and its assembly method, which transforms the cross-leakage between two systems into internal leakage within the system itself, thereby achieving the goal of "zero cross-leakage" between systems.

[0005] The technical solution of the present invention is as follows: A compact, high-pressure, high-flow, two-position, five-way hydraulic valve includes a valve body and a valve core. The valve core can move laterally between the left and right positions of the valve body. The valve body has radially arranged upstream port of system I, downstream port of system I, return port of system I, return port of system II, load A port, and load B port. One axial end of the valve body has a control port of system II, and the other axial end of the valve body is connected to the valve core with a spring. The valve core has a first large annular cavity, a small annular cavity, and a second large annular cavity along its axial direction. When the valve core is in the position of the control port of system II, the first large annular cavity connects to the upstream port of system I and the load A port, the small annular cavity connects to the return port of system II, the second large annular cavity connects to the downstream port of system I and the load B port, and the spring cavity where the spring is located connects to the return port of system I. When the valve core is in the position of the spring, the first large annular cavity connects to the load A port and the return port of system II, the small annular cavity connects to the downstream port of system I, the second large annular cavity connects to the load B port and the return port of system II, and the return port of system I is closed.

[0006] Furthermore, the valve core has a total leakage channel at its center, and leakage channels connecting to the total leakage channel are provided on both sides of the first large annular cavity and both sides of the second large annular cavity. The total leakage channel connects to the spring cavity.

[0007] Furthermore, a filter assembly, a flow-blocking plug, and a retaining ring are provided at the outlet of the main leakage channel connecting to the spring cavity.

[0008] Furthermore, a valve sleeve is provided between the valve body and the valve core. The valve sleeve is provided with a radial hole corresponding to each radial port on the valve body. A first T-type seal is provided between the valve sleeve and the valve body and the valve core on the control port side of the II system. A second T-type seal is provided between the radial holes of the valve sleeve in different axes.

[0009] Furthermore, pipe fitting assemblies are provided at the upstream port of System I, the downstream port of System I, the return port of System I, the return port of System II, the load port A, the load port B, and the control port of System II.

[0010] Furthermore, the pipe fitting assembly includes a pipe fitting and a combined seal. The pipe fitting is provided with a stop groove and a stop hole, and stainless steel wire is installed in the stop groove and the stop hole. The pipe fitting is also provided with a sealing groove, and the combined seal is installed in the sealing groove. A pin is installed in the pin hole on the flange face of the pipe fitting, and the pipe fitting is connected to the valve body through the pin.

[0011] Furthermore, the stop hole is a waist-shaped groove through hole, and the stop groove is a spherical groove.

[0012] An assembly method for a compact, high-pressure, high-flow, two-position, five-way hydraulic valve, used for assembling the aforementioned compact, high-pressure, high-flow, two-position, five-way hydraulic valve, includes the following steps: S1, First assemble the valve body and valve core; S2, the combined seal is pre-installed in the sealing groove of the pipe joint; S3, insert the assembled and sealed pipe fitting into the mounting hole, and rotate the pipe fitting so that its stop hole aligns with the thread hole of the valve body; S4. Pass the stainless steel wire through the wire hole of the valve body and embed it into the stop hole of the pipe joint. Rotate the pipe joint with a constant torque to complete a 360° rotation. During this process, the stainless steel wire is slowly wound into the stop groove on the housing and the pipe joint. S5. Screw the pin through the pin hole on the pipe fitting into the housing to restrict the circumferential movement of the pipe fitting.

[0013] The advantages of this invention are as follows: 1. This invention transforms cross-leakage between two systems into internal leakage within the system itself by using only one seal within the valve sleeve and the design of an internal leakage channel within the valve core, thus achieving the goal of "zero cross-leakage" between systems.

[0014] 2. The present invention has a simple connection method between the valve body and the pipe joint. It cleverly inserts a stainless steel wire between the two and uses the stainless steel wire to restrict the axial displacement of the pipe joint. This eliminates the space required for screws, flanges or threads in traditional connection methods, greatly reducing the product size and weight. At the same time, when the steel wire is working, one end is embedded in the pipe joint and will not come out under vibration or other environments, which increases the reliability of the pipe joint connection and improves the safety of the product. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This invention relates to a compact, high-pressure, high-flow, two-position, five-way hydraulic valve.

[0017] Figure 2 This is a structural diagram of the valve body of the present invention.

[0018] Figure 3 A cross-sectional view of the pipe fitting of the present invention in direction 2.

[0019] 1—Valve body, 2—Valve core, 3—First T-seal, 4—Valve sleeve, 5—Second T-seal, 6—Pipe fitting, 7—Combination seal, 8—Stainless steel wire, 9—Pin, 10—Filter assembly, 11—Block plug, 12—Snap ring, 13—Spring, 14—Spring seat, 15—Outer nut, 16—End cap, 17—Combination seal, 18—Sealing ring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0022] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] First embodiment: A compact, high-pressure, high-flow, two-position, five-way hydraulic valve includes a valve body 1 and a valve core 2. The valve core 2 can move laterally between the left and right positions of the valve body 1. The valve body 1 is radially provided with an upstream port of system I, a downstream port of system I, a return port of system I, a return port of system II, a load A port, and a load B port. One axial end of the valve body 1 is provided with a control port of system II, and a spring 13 is provided between the other axial end of the valve body 1 and the valve core 2. The valve core 2 is axially provided with a first large annular cavity, a small annular cavity, and a second large annular cavity. When the valve core 2 is in the position of the control port of system II, the first large annular cavity is connected to the upstream port of system I and the load A port, the small annular cavity is connected to the return port of system II, the second large annular cavity is connected to the downstream port of system I and the load B port, and the spring cavity where the spring 13 is located is connected to the return port of system I. When the valve core 2 is in the position of the spring 13, the first large annular cavity is connected to the load A port and the return port of system II, the small annular cavity is connected to the downstream port of system I, the second large annular cavity is connected to the load B port and the return port of system II, and the return port of system I is closed.

[0026] The valve core 2 has a main leakage channel at its center. Both sides of the first large annular cavity and both sides of the second large annular cavity have leakage channels that connect to the main leakage channel. The main leakage channel connects to the spring cavity.

[0027] The outlet of the main leakage channel connecting the spring cavity is equipped with a filter assembly 10, a flow-blocking plug 11, and a retaining ring 12.

[0028] A valve sleeve 4 is provided between the valve body 1 and the valve core 2. The valve sleeve 4 is provided with a radial hole corresponding to each radial port on the valve body 1. A first T-type seal 3 is provided between the valve sleeve 4 and the valve body 1 and the valve core 2 on the side of the II system control port. A second T-type seal 5 is provided between the radial holes of the valve sleeve 4 in different axial directions.

[0029] Pipe fitting assemblies are provided at the upstream port of System I, the downstream port of System I, the return port of System I, the return port of System II, the load port A, the load port B, and the control port of System II.

[0030] The pipe fitting assembly includes a pipe fitting 6 and a combined seal 7. The pipe fitting 6 is provided with a stop groove and a stop hole, and stainless steel wire 8 is installed in the stop groove and the stop hole. The pipe fitting 6 is also provided with a sealing groove, and the combined seal 7 is installed in the sealing groove. A pin 9 is installed in the pin hole on the flange face of the pipe fitting 6, and the pipe fitting 6 is connected to the valve body 1 through the pin 9.

[0031] The stop hole is a waist-shaped through hole, and the stop groove is a spherical groove.

[0032] An assembly method for a compact, high-pressure, high-flow, two-position, five-way hydraulic valve, used for assembling the aforementioned compact, high-pressure, high-flow, two-position, five-way hydraulic valve, includes the following steps: S1, First assemble valve body 1 and valve core 2; S2, the combined seal 7 is pre-installed in the sealing groove of the pipe joint 6; S3, insert the assembled and sealed pipe fitting into the mounting hole, and rotate the pipe fitting 6 to align its stop hole with the thread hole of the valve body 1; S4, the stainless steel wire 8 is passed through the wire hole of the valve body 1 and embedded into the stop hole of the pipe joint 6. The pipe joint 6 is rotated with a constant torque to complete a 360° rotation. During this process, the stainless steel wire is slowly wound into the stop groove on the housing 1 and the pipe joint 6. S5, screw the pin 9 through the pin hole on the pipe joint 6 into the housing to restrict the circumferential movement of the pipe joint 6.

[0033] Second embodiment: like Figure 1 As shown, the present invention provides a compact high-pressure, high-flow two-position five-way hydraulic valve, comprising: a valve body 1, a slide valve assembly, and a pipe connector assembly. A sleeve nut 15 is screwed into the right end of the valve body 1 to fix the end cover 16. A combined seal 17 is installed on the end cover 16 to achieve sealing between the right end chamber of the valve body and the external environment. A spring 13 for controlling the reset of the slide valve assembly and a spring seat 14 for limiting the displacement of the valve core assembly are installed between the slide valve assembly and the end cover 16.

[0034] The structure of valve body 1 is as follows: Figure 2 As shown, the valve assembly has a slide valve assembly mounting cavity. The left end of the slide valve assembly mounting cavity is designed with a pipe connector assembly mounting hole K port, which connects to the control end of system II. The right end of the slide valve assembly mounting cavity is designed with a pipe connector assembly mounting hole R port, which connects to the return oil of system I. The slide valve assembly mounting cavity has 6 grooves opened from left to right. The grooves are connected to the upstream of system I through the pipe connector assembly mounting hole P1 on the valve body, the actuator load A through the mounting hole A, the return oil of system II through the mounting hole T, the downstream of system I through the mounting hole P2, the actuator load B through the mounting hole B, and the return oil of system II through the mounting hole T. Each pipe connector assembly mounting hole is designed with a thread hole, a stop groove, and a pin hole. The above-mentioned wire-threading hole is a waist-shaped groove through hole, used to thread stainless steel wire 8; The aforementioned stop groove is a spherical groove used to accommodate stainless steel wire 8; The aforementioned pin holes are designed with two at each pipe fitting assembly mounting hole in the housing to restrict the circumferential rotation of the pipe fitting. All of the above-mentioned mounting holes K, P1, P2, A, B, T, and R are equipped with pipe fitting assemblies, which are used to connect to the system.

[0035] The slide valve assembly includes: valve core 2, T-seal 3, valve sleeve 4, T-seal 5, filter assembly 10, flow stop plug 11, snap ring 12, and sealing ring 18. The valve sleeve 4 is designed with 6 circumferentially distributed flow holes along the axial direction at the 6 grooves corresponding to the housing 1 as oil passages to connect the inside of the valve sleeve and the system. T-type seals 5 are installed between the flow holes at different axial positions. A T-type seal 5 is installed between the outer side of the first flow hole of the valve sleeve 4 and the left end face. A T-type seal 3 is installed between the inner side of the first flow hole of the valve sleeve 4 and the left end face. A sealing ring 18 is installed between the outer side of the sixth flow hole of the valve sleeve 4 and the right end face. The inner hole of the valve sleeve 4 is matched with the valve core 2. The valve core 2 can move within the valve sleeve 4; The aforementioned T-type seal 3 is used to isolate the hydraulic oil at the control end of the II system from the upstream of the I system, ensuring that no leakage occurs between the systems; The valve core 2 described above has 5 leakage channels. At the right end of the main leakage channel, a filter assembly 10, a flow-blocking plug 11, and a retaining ring 12 are installed in sequence. Since the flow resistance of the leakage channels is much smaller than the gap between the valve core 2 and the valve sleeve 4, the high-pressure oil upstream of system I will preferentially leak to the return oil of system I through leakage channels 1 and 2 via port P1, and will not leak to system II. The high-pressure oil downstream of system I will preferentially leak to the return oil of system I through leakage channels 3 and 4 via port P2, and will not leak to system II. The aforementioned filter assembly is installed at the end of the main leakage channel to prevent excess material from clogging the flow and blocking the small holes; The above-mentioned flow-blocking plug has a small hole with a diameter of 0.5mm, mainly to prevent the leakage channel hole from passing through the high pressure groove of the valve sleeve 4 during the valve core switching process, and the high pressure oil from leaking a large amount to the low pressure return oil R through the leakage channel. The aforementioned retaining ring 12 is used to prevent the filter assembly 10 and the flow-blocking plug 11 from coming out; The pipe fitting assembly includes a pipe fitting 6 and a combined seal 7; The structure of the above-mentioned pipe fitting 6 is as follows Figure 3 As shown, from the outside to the inside, a stop groove and a stop hole are designed for installing stainless steel wire 8, a sealing groove is designed for installing combination seal 7, and a pin hole is provided on the flange face of pipe joint 6 for installing pin 9.

[0036] A method for assembling a pipe fitting for a compact, high-pressure, high-flow, two-position, five-way hydraulic valve includes the following steps: The combined seal 7 is pre-installed in the sealing groove of the pipe joint 6; Insert the assembled and sealed pipe fitting into the mounting hole, and rotate the pipe fitting 6 so that its stop hole aligns with the thread hole of the valve body 1; The stainless steel wire 8 is passed through the wire hole of the valve body 1 and embedded into the stop hole of the pipe joint 6. Then, the pipe joint 6 is rotated with a constant torque to complete a 360° rotation. During this process, the stainless steel wire is slowly wound into the stop groove on the housing 1 and the pipe joint 6. Screw the pin 9 through the pin hole on the pipe connector 6 into the housing to restrict the circumferential movement of the pipe connector 6.

[0037] The present invention discloses an assembly method for a compact high-pressure, high-flow two-position five-way hydraulic valve and its pipe fittings. A pipe fitting assembly is installed in the pipe fitting hole of the valve body, and the pipe fitting assembly is fixed to the valve body by stainless steel wire and pins. A spool valve assembly is installed in the valve sleeve hole of the valve body. A control terminal for connecting to system II is installed at the left end of the valve sleeve hole of the valve body, and a spring seat, end cap, and outer nut are installed at the right end of the valve sleeve hole of the valve body, communicating with the return oil of system II. Six grooves are sequentially opened from left to right on the valve body, and these grooves communicate sequentially with the upstream of system I, actuator load port A, return oil of system II, oil port P2 (system I), actuator load port B, and return oil of system II through the pipe fittings installed on the valve body. This invention enables the realization of a hydraulic circuit configuration that traditionally requires multiple directional valves in combination. It innovatively transforms the mutual leakage between systems I and II into internal leakage between systems. Its structure is simple, safe, and reliable, suitable for switching hydraulic circuits between two systems requiring "zero cross-leakage." By using steel wire instead of traditional threads or screws to connect the valve body and pipe fittings, it withstands the axial hydraulic pressure of the pipe fittings. This primarily addresses the problem of overload and fatigue damage to fasteners caused by excessive hydraulic pressure during prolonged high-flow hydraulic pipe fitting processes. Its structure is simple and requires minimal space.

[0038] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A compact, high-pressure, high-flow-rate, two-position, five-way hydraulic valve, characterized in that, The valve body (1) and valve core (2) are included. The valve core (2) can move laterally between the left and right positions of the valve body (1). The valve body (1) is provided radially with an upstream port of system I, a downstream port of system I, a return port of system I, a return port of system II, a load A port, and a load B port. One axial end of the valve body (1) is provided with a control port of system II. A spring (13) is provided between the other axial end of the valve body (1) and the valve core (2). The valve core (2) is provided axially with a first large annular cavity, a small annular cavity, and a second large annular cavity. (2) When the valve core (2) is located on the side of the control port of system II, the first large ring cavity is connected to the upstream port of system I and the load port A, the small ring cavity is connected to the return port of system II, the second large ring cavity is connected to the downstream port of system I and the load port B, and the spring cavity where the spring (13) is located is connected to the return port of system I; when the valve core (2) is located on the side of the spring (13), the first large ring cavity is connected to the load port A and the return port of system II, the small ring cavity is connected to the downstream port of system I, the second large ring cavity is connected to the load port B and the return port of system II, and the return port of system I is closed.

2. The compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 1, characterized in that, The valve core (2) has a total leakage channel at its center. Both sides of the first large annular cavity and both sides of the second large annular cavity have leakage channels that connect to the total leakage channel. The total leakage channel connects to the spring cavity.

3. A compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 2, characterized in that, The outlet of the main leakage channel connecting the spring cavity is equipped with a filter assembly (10), a flow-blocking plug (11), and a retaining ring (12).

4. A compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 1, characterized in that, A valve sleeve (4) is provided between the valve body (1) and the valve core (2). The valve sleeve (4) is provided with a radial hole corresponding to the radial port on each valve body (1). The valve sleeve (4) is provided with a first T-type seal (3) between the valve body (1) and the valve core (2) on the side of the II system control port. The valve sleeve (4) is provided with a second T-type seal (5) between the radial holes in different axes.

5. A compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 1, characterized in that, Pipe fitting assemblies are provided at the upstream port of System I, the downstream port of System I, the return port of System I, the return port of System II, the load port A, the load port B, and the control port of System II.

6. A compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 1, characterized in that, The pipe fitting assembly includes a pipe fitting (6) and a combination seal (7). The pipe fitting (6) is provided with a stop groove and a stop hole. Stainless steel wire (8) is installed in the stop groove and the stop hole. The pipe fitting (6) is also provided with a sealing groove. The combination seal (7) is installed in the sealing groove. A pin (9) is installed in the pin hole on the flange face of the pipe fitting (6). The pipe fitting (6) is connected to the valve body (1) through the pin (9).

7. A compact high-pressure, high-flow two-position five-way hydraulic valve according to claim 6, characterized in that, The stop hole is a waist-shaped through hole, and the stop groove is a spherical groove.

8. A method for assembling a compact high-pressure, high-flow two-position five-way hydraulic valve, used for assembling the compact high-pressure, high-flow two-position five-way hydraulic valve as described in claim 6, characterized in that, Includes the following steps: S1, First assemble the valve body (1) and valve core (2); S2, the combined seal (7) is pre-installed in the sealing groove of the pipe joint (6); S3, insert the assembled and sealed pipe fitting into the mounting hole, and rotate the pipe fitting (6) to align its stop hole with the thread hole of the valve body (1); S4, pass the stainless steel wire (8) through the wire hole of the valve body (1) and insert it into the stop hole of the pipe joint (6). Rotate the pipe joint (6) with a constant torque to complete a 360° rotation. During this process, the stainless steel wire is slowly wound into the stop groove on the housing (1) and the pipe joint (6). S5, screw the pin (9) through the pin hole on the pipe joint (6) into the housing to restrict the circumferential movement of the pipe joint (6).

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