Three-position four-way directional control valve, control method, and control apparatus

Abstract

A three-position four-way directional control valve, a control method, and a control apparatus. The three-position four-way directional control valve comprises a valve body and an end cover. A valve sleeve, a first valve spool, and a second valve spool are disposed inside the valve body. The first valve spool is movably disposed within the valve sleeve, and the second valve spool is movably disposed within the first valve spool. Movement of the second valve spool drives the first valve spool to move so as to control fluid flow. The three-position four-way directional control valve achieves precise control in directional switching and flow regulation by controlling the positions of multiple valve spools, while featuring a compact and simple structure.

Description

A three-position four-way directional valve, control method and control device Technical Field

[0001] The present disclosure relates to the technical field of reversing valve control, and in particular to a three-position four-way reversing valve, a control method, and a control device. Background Art

[0002] The electro-hydraulic directional valve is the core control component of an electro-hydraulic control system. It is a hydraulically actuated directional valve composed of a solenoid pilot valve and a main valve. High-pressure fluid in the solenoid pilot valve's hydraulic circuit pushes the main valve spool, controlling the movement of the actuator. As a key component in the electro-hydraulic control of hydraulic cylinders, the electro-hydraulic directional valve plays a vital role in achieving comprehensive mechanization, automation, and intelligent control of hydraulic systems. Furthermore, with the widespread adoption and application of intelligent control across various industries, the demand for control precision in hydraulic systems is increasing, placing a demand on electro-hydraulic directional valves for flow control, thereby controlling the speed and direction of actuators and achieving more precise control.

[0003] Flow control in existing reversing valves depends on the opening of the main valve core, which is determined by the equilibrium position between the pilot fluid pressure and the spring force. The key to achieving high-precision flow control lies in controlling the pilot fluid pressure. In existing technologies, pilot fluid pressure is controlled by adjusting the opening of a solenoid pressure reducing valve. Other solutions use high-speed on-off valves. These solutions all suffer from the energy waste caused by continuous fluid pressure relief and place very high demands on the design and processing of the electromagnet, pilot valve core, and main valve core. Currently, high-precision electro-hydraulic proportional reversing valves are difficult to design and manufacture, and are costly.

[0004] Summary of the Invention

[0005] In view of this, the present disclosure aims to provide a three-position four-way reversing valve, a control method and a control device to solve the technical problems in the prior art that the pilot liquid pressure is controlled by adjusting the opening of an electromagnetic pressure reducing valve or regulated by a high-speed switching valve, resulting in continuous liquid discharge and pressure reduction, causing energy waste and placing very high requirements on the design and processing of the electromagnet, pilot valve core and main valve core.

[0006] One aspect of the present disclosure provides a three-position four-way reversing valve, including a valve body and an end cover, wherein a valve sleeve, a first valve core and a second valve core are arranged in the valve body, the first valve core is movably arranged in the valve sleeve, and the second valve core is movably arranged in the first valve core, and the movement of the second valve core drives the movement of the first valve core to realize the control of liquid circulation.

[0007] In some embodiments, the valve sleeve adopts a cylindrical structure, and a liquid inlet ring groove, a first working ring groove, a second working ring groove and two liquid return ring grooves are provided on the outer wall of the valve sleeve. The first working ring groove and the second working ring groove are symmetrically arranged relative to the center line of the liquid inlet ring groove, and the two liquid return ring grooves are symmetrically arranged relative to the center line of the liquid inlet ring groove.

[0008] In some embodiments, a liquid inlet, a liquid return port, a first working port and a second working port are provided on the valve body; the liquid inlet connects the system liquid inlet with the liquid inlet ring groove, the liquid return port connects the system liquid return with the two liquid return ring grooves, the first working port connects the actuator with the first working ring groove, and the second working port connects the actuator with the second working ring groove.

[0009] In some embodiments, the first valve core has a locked state during movement.

[0010] In some embodiments, when the first valve core is in a locked state, the working port is neither in communication with the liquid inlet nor in communication with the liquid return port.

[0011] In some embodiments, radial liquid holes are provided in the liquid inlet ring groove, the first working ring groove, the second working ring groove and the two liquid return ring grooves, and the liquid in each ring groove enters the interior of the valve sleeve through the radial liquid holes.

[0012] In some embodiments, sealing rings are provided between the liquid inlet ring groove, the first working ring groove, the second working ring groove, and the two liquid return ring grooves.

[0013] In some embodiments, a pilot liquid inlet channel is provided in the middle of the first valve core, pilot liquid return channels are symmetrically provided on both sides of the pilot liquid inlet channel, a first liquid passing ring groove and a second liquid passing ring groove are provided between the pilot liquid inlet channel and each of the pilot liquid return channels, and a first pilot liquid return ring groove and a second pilot liquid return ring groove are provided on the outer sides of the two pilot liquid return channels.

[0014] In some embodiments, a third liquid ring groove and a fourth liquid ring groove are symmetrically arranged on the outer wall of the second valve core, and the third liquid ring groove and the fourth liquid ring groove are respectively connected to the end faces on both sides of the second valve core through internal liquid channels.

[0015] In some embodiments, on the side of the valve body away from the end cover, the inner wall of one side of the valve body, the end face of the first valve core and the end face of the second valve core are combined to form a first control chamber; on the other side of the valve body close to the end cover, the end face of the first valve core, the end face of the second valve core and the end face of the end cover are combined to form a second control chamber.

[0016] In some embodiments, springs are respectively provided at both ends of the first valve core, one end of the two springs is connected to the end surface of the first valve core, and the other ends of the two springs are respectively abutted against the bottom surface of the valve body and the inner surface of the end cover.

[0017] In some embodiments, the end of the second valve core facing the end cover is connected to the first end of the connecting rod, and the second end of the connecting rod is connected to a driving assembly for driving the second valve core to move back and forth.

[0018] Another aspect of the present disclosure provides a control method for a three-position four-way reversing valve, comprising:

[0019] The second valve core is controlled to move toward the first direction to the working position, and the core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return liquid channel. The high-pressure liquid entering through the pilot liquid inlet channel enters the first control chamber through the third liquid ring groove and the internal channel of the second valve core to drive the first valve core to move in the first direction;

[0020] The second valve core is controlled to stop moving, and the connection between the third liquid ring groove and the pilot liquid inlet channel is disconnected through the movement of the first valve core. At the same time, the third liquid ring groove is connected to the pilot return liquid channel on the corresponding side. The high-pressure liquid in the first control chamber is discharged through the pilot return liquid channel, so that the first valve core and the second valve core are in a dynamic equilibrium state.

[0021] In some embodiments, before controlling the second valve core to move toward the first direction to the working position, the method further includes:

[0022] The second valve core is controlled to move from the zero-position control state toward the first direction to the dynamic balance position, the third liquid ring groove of the second valve core is connected to the pilot liquid inlet channel, and the core part of the second valve core located on one side of the third liquid ring groove just blocks the pilot return liquid channel on the corresponding side, so that the first valve core and the second valve core are in a dynamic balance state.

[0023] In some embodiments, when the first valve core is in the zero position control state, the first liquid ring groove connects the first working ring groove and the corresponding liquid return ring groove on one side, and the second liquid ring groove connects the second working ring groove and the corresponding liquid return ring groove on the other side.

[0024] In some embodiments, after the first valve core and the second valve core are in a dynamic equilibrium state, the method further includes:

[0025] The second valve core is controlled to continue to move toward the first direction, and the first valve core is in a follow-up state to regulate the output or input of the fluid medium to the corresponding working port.

[0026] In some embodiments, when the first valve core is in the follow-up state, the movement distance of the first valve core is the same as the movement distance of the second valve core.

[0027] In some embodiments, when the first valve core is in a follow-up state, when the first valve core moves to the first liquid ring groove and is connected with the liquid inlet ring groove and the second liquid ring groove is completely connected with the liquid return ring groove on the corresponding side, the first liquid ring groove is connected with the first working port and the second liquid ring groove is connected with the second working port.

[0028] In some embodiments, further comprising:

[0029] The second valve core is controlled to continue to move toward the first direction until the end surface of the first valve core or the second valve core abuts against the end cover or the inner wall of the valve body to reach a preset limit position.

[0030] In some embodiments, the pilot liquid inlet channel is connected to the liquid inlet, and the first pilot liquid return annular groove and the second pilot liquid return annular groove are always connected to the liquid return port.

[0031] In some embodiments, further comprising:

[0032] When the opening of the first valve core is reduced or the output of the working port is switched, the second valve core is controlled to move in the second direction.

[0033] Another aspect of the present disclosure provides a control device for a three-position four-way reversing valve, comprising:

[0034] a first control module, configured to control the second valve core to move in a first direction to a working position, wherein a core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return liquid passage, and high-pressure liquid entering through the pilot liquid inlet passage enters the first control chamber through the third liquid ring groove and an internal passage of the second valve core to drive the first valve core to move in the first direction;

[0035] The second control module is used to control the second valve core to stop moving, and the first valve core is moved to disconnect the connection between the third liquid ring groove and the pilot liquid inlet channel, and at the same time connect the third liquid ring groove with the pilot return liquid channel on the corresponding side. The high-pressure liquid in the first control chamber is discharged through the pilot return liquid channel, so that the first valve core and the second valve core are in a dynamic equilibrium state.

[0036] The disclosed embodiment replaces the pressure control in the prior art solution with position control of multiple valve cores in switching and flow regulation, which has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0037] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, are used to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method. The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their description are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0039] FIG1 is a schematic diagram of the structure of a three-position four-way reversing valve provided in an embodiment of the present disclosure and in an initial state;

[0040] FIG2 is a schematic diagram of a three-position four-way directional valve in a first state provided by an embodiment of the present disclosure;

[0041] FIG3 is a schematic diagram of a three-position four-way reversing valve in a second state provided by an embodiment of the present disclosure;

[0042] FIG4 is a schematic diagram of a three-position four-way directional valve in a third state provided by an embodiment of the present disclosure;

[0043] FIG5 is a schematic diagram of a three-position four-way reversing valve in a fourth state provided by an embodiment of the present disclosure;

[0044] FIG6 is a schematic diagram of a three-position four-way reversing valve in a fifth state provided by an embodiment of the present disclosure;

[0045] FIG7 is a schematic diagram of a three-position four-way reversing valve in a sixth state provided by an embodiment of the present disclosure;

[0046] FIG8 is a schematic diagram of a three-position four-way reversing valve in a seventh state provided by an embodiment of the present disclosure;

[0047] FIG9 is a schematic structural diagram of another three-position four-way reversing valve provided in an embodiment of the present disclosure;

[0048] FIG10 is a schematic diagram of steps of a control method for a three-position four-way directional valve provided in an embodiment of the present disclosure.

[0049] The above drawings include the following reference numerals:

[0050] 1-valve body; 2-valve sleeve; 3-first valve core; 4-second valve core; 5-end cover; 6-spring; 7-connecting rod; 8-drive assembly. DETAILED DESCRIPTION

[0051] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, but are not intended to limit the present disclosure.

[0052] It should be understood that various modifications may be made to the embodiments disclosed herein. Therefore, the above description should not be considered as limiting, but merely as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0053] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0054] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0055] It should also be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the characteristics recited in the claims and are therefore within the scope of protection defined thereby.

[0056] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0057] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant detail. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to variously employ the present disclosure with substantially any suitable detailed structure.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0059] This description may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," each of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0060] An embodiment of the present disclosure provides a control method for a three-position, four-way directional control valve. As shown in FIG1 , the three-position, four-way directional control valve includes a valve body 1 and an end cap 5. A valve sleeve 2, a first valve core 3, and a second valve core 4 are disposed within the valve body 1. The second valve core 4 is disposed within the first valve core 3. The valve sleeve 2 and the valve body 1 can be screwed together. In other embodiments, they can be connected by other means, such as flanges. The specific connection form is not limited.

[0061] The end cover 5 and the valve sleeve 2 can also be connected by screwing to restrict the first valve core 3 and the second valve core 4 inside the valve sleeve 2, and a sealing structure is provided to prevent the liquid inside the valve sleeve 2 from leaking.

[0062] Specifically, the valve body 1 herein adopts a cylindrical structure, with a liquid inlet, a liquid return port, a first working port, and a second working port disposed along its length on its outer wall. The liquid inlet is located in the middle, with the first and second working ports located on either side of the liquid inlet, respectively. Liquid return ports are disposed outside the first and second working ports, respectively. The liquid inlet connects to an external liquid inlet device as the input for high-pressure liquid, while the liquid return port connects to an external liquid return device, where the pressure is either zero or significantly lower than the liquid inlet pressure. The first and second working ports serve as control ports for connecting actuators. For example, a hydraulic cylinder and a hydraulic motor can be connected through the first and second working ports, respectively. By controlling the direction and flow rate of liquid within the three-position, four-way reversing valve, the movement direction and speed of different actuators can be adjusted. The inner side of the liquid inlet forms a liquid inlet chamber, the inner side of the liquid return port forms a liquid return chamber, and the inner sides of the first and second working ports each form a working chamber.

[0063] Furthermore, the valve sleeve 2 adopts a cylindrical structure, with its outer wall provided along the length of the valve sleeve 2 with a liquid inlet annular groove P, a first working annular groove A, a second working annular groove B, and two liquid return annular grooves T. Through the internal flow path of the valve body 1, the liquid inlet annular groove P is connected to the liquid inlet port of the valve body 1, and the two liquid return annular grooves T are simultaneously connected to the liquid return port. The first working annular groove A is connected to the first working port, and the second working annular groove B is connected to the second working port. Thus, the liquid inlet annular groove P is located in the middle of the valve sleeve 2, the first working annular groove A and the second working annular groove B are located on either side of the liquid inlet annular groove P, and the liquid return annular grooves T are respectively provided on the outer sides of the first working annular groove A and the second working annular groove B. The first working annular groove A and the second working annular groove B are of the same size, and the two liquid return annular grooves T are of the same size.

[0064] Specifically, the liquid inlet ring groove P, the first working ring groove A, the second working ring groove B and the two liquid return ring grooves T form five chambers in sequence, wherein the first working ring groove A and the second working ring groove B are symmetrically arranged relative to the center line of the liquid inlet ring groove P, and similarly, the two liquid return ring grooves T are symmetrically arranged relative to the center line of the liquid inlet ring groove P.

[0065] Furthermore, the interior of the valve sleeve 2 is configured as a continuous smooth cylindrical surface, and radial liquid holes are provided in each of the annular grooves, through which the liquid in each annular groove can enter the interior of the valve sleeve 2.

[0066] Furthermore, sealing rings are provided between the liquid inlet ring groove P, the first working ring groove A, the second working ring groove B and the two liquid return ring grooves T. The sealing rings can separate the five chambers to prevent liquid from flowing between different chambers.

[0067] The first valve core 3 in this embodiment is arranged in the valve sleeve 2, and it can adopt a hollow cylindrical structure. Through reasonable shape parameter setting, the outer wall of the first valve core 3 is tightly matched with the inner wall of the valve sleeve 2. The first valve core 3 can move back and forth in the valve sleeve 2 along the length direction of the valve sleeve 2. Different moving positions can prevent liquid flow, thereby achieving the effect of controlling liquid circulation.

[0068] Furthermore, a pilot liquid inlet channel Px is provided in the middle of the first valve core 3, and pilot liquid return channels Tx are symmetrically provided on both sides of the pilot liquid inlet channel Px. A first liquid-transmitting annular groove Ad and a second liquid-transmitting annular groove Bd are provided between the pilot liquid inlet channel Px and the two pilot liquid return channels Tx along the length direction of the first valve core 3. A first pilot liquid-transmitting annular groove Ta and a second pilot liquid-transmitting annular groove Tb are provided on the outer sides of the two pilot liquid return channels Tx along the length direction of the first valve core 3. The first liquid-transmitting annular groove Ad and the second liquid-transmitting annular groove Bd have the same dimensions, and the first pilot liquid-transmitting annular groove Ta and the second pilot liquid-transmitting annular groove Tb have the same dimensions.

[0069] The interior of the first valve core 3 here is set as a through smooth cylindrical surface, the pilot liquid inlet channel Px is used to connect the inner hole of the second valve core 4 and the liquid inlet ring groove P, and the two pilot return liquid channels Tx are used to connect the first pilot return liquid ring groove Ta and the second pilot return liquid ring groove Tb located on both sides with the return liquid ring groove T.

[0070] Furthermore, the second valve core 4 here is arranged inside the first valve core 3, and it can adopt a cylindrical structure. Through reasonable shape parameter setting, the outer wall of the second valve core 4 is tightly matched with the inner wall of the first valve core 3. The second valve core 4 can move back and forth in the first valve core 3 along the length direction of the first valve core 3. Through different moving positions, the flow of liquid can be prevented, thereby achieving the effect of controlling the circulation of liquid.

[0071] In addition, in order to enhance the effect of the first valve core 3 and the second valve core 4 in blocking the flow of media between the chambers, a sealing member may be provided at a tightly fitting position.

[0072] Furthermore, a third liquid-transmitting annular groove Ax and a fourth liquid-transmitting annular groove Bx are provided on the outer wall of the second valve core 4 along its length. The third liquid-transmitting annular groove Ax and the fourth liquid-transmitting annular groove Bx are connected to the end surfaces on both sides via internal liquid-transmitting channels. The third liquid-transmitting annular groove Ax and the fourth liquid-transmitting annular groove Bx have the same dimensions.

[0073] Furthermore, on the side of the valve body 1 away from the end cover 5, the inner wall of one side of the valve body 1, the end face of the first valve core 3 and the end face of the second valve core 4 are together formed to form a first control chamber KA, and on the other side of the valve body 1 close to the end cover 5, the end face of the first valve core 3, the end face of the second valve core 4 and the end face of the end cover 5 are together formed to form a second control chamber KB.

[0074] The first valve core 3 is in a zero-position control state during initial installation. In the zero-position control state, the center of the first valve core 3 is arranged opposite to the center of the liquid inlet annular groove P, and each annular groove is in a symmetrical structure.

[0075] In some embodiments, as shown in Figure 9, in order to ensure that the first valve core 3 maintains a zero position state during initial installation, springs 6 are respectively provided at both ends of the first valve core 3, and the two springs 6 have the same shape and the same compression state. One end of the two springs 6 is connected to the end face of the first valve core 3, and the other ends of the two springs 6 are respectively abutted against the bottom surface of the valve body 1 and the inner surface of the end cover 5, and can also be connected to a component that remains relatively stationary with the valve sleeve 2.

[0076] In other embodiments, to ensure control effectiveness and accuracy, a displacement sensor (not shown) is provided on the first valve core 3 and / or the second valve core 4 to feed back position information of the first valve core 3 and / or the second valve core 4 to an external control device to form a displacement closed-loop control. In other embodiments, a flow sensor (not shown) may also be provided at the first working port and / or the second working port to feed back output flow information to an external control device to form a flow closed-loop control.

[0077] The three-position, four-way directional control valve of this embodiment can achieve the function of controlling the reversing flow of liquid. During the control process of the three-position, four-way directional control valve, the reciprocating movement of the second valve core 4 is controlled to cause the high-pressure liquid in the liquid inlet annular groove P to enter the first control chamber KA or the second control chamber KB, thereby driving the first valve core 3 to move accordingly, so that the first valve core 3 blocks the return liquid chamber and connects the working chamber and the liquid inlet chamber, thereby achieving the purpose of controlling the flow direction of the medium.

[0078] Continuing with Figure 9, to control the second valve core 4, the end of the second valve core 4 facing the end cap 5 is connected to the first end of a connecting rod 7, the second end of which is connected to a drive assembly 8. The drive assembly 8 and the connecting rod 7 cooperate to control the movement of the second valve core 4. Furthermore, because the second valve core 4 is smaller and subject to less load, it can be controlled using a lower-power drive assembly, making it easier to achieve control in situations where power consumption at the control end is limited.

[0079] Furthermore, the connecting rod 7 can pass through the end cover 5 , and a corresponding seal is provided between the connecting rod 7 and the end cover 5 . In another embodiment, the drive assembly is integrated into the valve body 1 and located inside the end cover 5 .

[0080] The driving component 8 here can be a manual lifting device, or an electrically controlled translation device such as an electromagnet, a linear motor, etc., as long as it can drive the second valve core 4 to move back and forth.

[0081] As shown in FIG10 , the control method of the embodiment of the present disclosure includes the following steps:

[0082] S101: Control the second valve core to move in the first direction to a working position. The core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return channel. High-pressure liquid entering through the pilot liquid inlet channel passes through the third liquid ring groove and the internal channel of the second valve core and enters the first control chamber, thereby driving the first valve core to move in the first direction.

[0083] S102, control the second valve core to stop moving, and disconnect the connection between the third liquid ring groove and the pilot liquid inlet channel through the movement of the first valve core, and at the same time connect the third liquid ring groove with the pilot return liquid channel on the corresponding side, and the high-pressure liquid in the first control chamber is discharged through the pilot return liquid channel so that the first valve core and the second valve core are in a dynamic equilibrium state.

[0084] Furthermore, before the above step S101, that is, before controlling the second valve core to move toward the first direction to the working position, the method further includes:

[0085] The second valve core is controlled to move from a zero-position control state toward a first direction to a dynamic equilibrium position. The third liquid-transmitting ring groove of the second valve core communicates with the pilot liquid inlet channel, and the core portion of the second valve core located on one side of the third liquid-transmitting ring groove exactly blocks the pilot liquid return channel on the corresponding side, thereby placing the first valve core and the second valve core in a dynamic equilibrium state. Specifically, when the first valve core is in the zero-position control state, the first liquid-transmitting ring groove connects the first working ring groove with the corresponding liquid return ring groove on one side, and the second liquid-transmitting ring groove connects the second working ring groove with the corresponding liquid return ring groove on the other side.

[0086] Further, after the above step S102, that is, after the first valve core and the second valve core are in a dynamic balance state, it further includes:

[0087] Controlling the second valve core to continue moving in the first direction, and the first valve core is in a follow-up state to regulate the output or input of the fluid medium to the corresponding working port.

[0088] The following will elaborate on the above steps.

[0089] As shown in FIG. 1, in the initial state, the first valve core 3 is in a zero-position control state. At this time, the first liquid-passing ring groove Ad connects the first working ring groove A and the liquid-returning ring groove T on one side, and the second liquid-passing ring groove Bd connects the second working ring groove B and the liquid-returning ring groove T on the other side. Here, the two working ring grooves on both sides are simultaneously connected to the liquid-returning ring groove T, and the first liquid-passing ring groove Ad and the second liquid-passing ring groove Bd are at a predetermined distance from the liquid-inlet ring groove P. At this time, the first valve core 3, the second valve core 4 and each channel maintain static balance, without any action or medium flow.

[0090] Here, by setting the spring 6, it is convenient to make the first valve core 3 in a zero-position control state. Among them, when the first valve core 3 is in a zero-position control state, the spring forces of the springs 6 on both sides are the same; when the first valve core 3 moves a certain distance in any direction, the spring force on one side decreases and the spring force on the other side increases, which will cause the uneven force on both sides of the first valve core 3. At this time, it is necessary to adjust the structural parameter settings of the second valve core 4 to change the position of the first valve core 3. Specifically, the third liquid-passing ring groove Ax of the second valve core 4 is simultaneously connected to the pilot liquid-inlet channel Px and the pilot liquid-return channel Tx, and a hydraulic pressure FKA that just balances the spring force is formed in the control cavity on one side, that is, fKA + FKA = fKB (here it is assumed that after the first valve core 3 moves to the right, fKA < fKB). In this way, the first valve core 3 will be in a dynamic balance state. As the moving distance of the first valve core 3 is different, the magnitudes of fKA and fKB are also different. However, since the second valve core 4 is controlled not to act, the first valve core 3 realizes floating automatic balance, that is, it will automatically find and adjust the balance point of the opening degree of the connection between the third liquid-passing ring groove Ax and the pilot liquid-inlet channel Px and the pilot liquid-return channel Tx, so as to achieve the above dynamic balance state.

[0091] As shown in Figure 2, when the second valve core 4 moves toward the end cover 5 (to the right in Figure 2) and reaches a dynamic equilibrium position, that is, just when the third liquid ring groove Ax of the second valve core 4 is about to connect with the pilot liquid inlet channel Px, the core portion located to the left of the third liquid ring groove Ax just blocks the pilot return liquid channel Tx on one side. In this way, the fourth liquid ring groove Bx of the second valve core 4 is further away from the pilot liquid inlet channel Px and continues to maintain connection with the pilot return liquid channel Tx on the other side, so that the first valve core 3 and the second valve core 4 are in a dynamic equilibrium state. At this time, even if the first valve core 3 and the second valve core 4 move back and forth within a small range due to internal or external disturbances, since the first valve core 3 and the second valve core 4 are both in a floating state, they will automatically return to the above state through the action of internal liquid pressure.

[0092] As shown in Figure 3, when the second valve core 4 continues to move toward the direction of the end cover 5 (the right side in Figure 3) and moves to the working position, that is, when the third liquid ring groove Ax is connected with the pilot liquid inlet channel Px, the core body part located on the left side of the third liquid ring groove Ax completely blocks the pilot return liquid channel Tx, and the high-pressure liquid enters the first control chamber KA through the third liquid ring groove Ax and the internal channel of the second valve core 4, thereby increasing the pressure in the chamber; at this time, the left side of the first valve core 3 is affected by the liquid pressure, while the right side of the first valve core 3 continues to be connected with the return liquid ring groove T without pressure, so that the first valve core 3 moves to the right under the action of the liquid pressure.

[0093] As shown in Figure 4, the first valve core 3 continues to move toward the end cover 5 (the right side in Figure 4) under the action of liquid pressure, and at this time the second valve core 4 does not move under the action of the external control device, so that after the first valve core 3 moves to the right for a distance, the connection between the third liquid ring groove Ax and the pilot liquid inlet channel Px will be disconnected and the pilot return liquid channel Tx on one side will be connected. The high-pressure liquid in the first control chamber KA will be quickly unloaded through the pilot return liquid channel Tx, so that the liquid pressure on both sides of the first valve core 3 is rebalanced, and at this time the relative positions of the first valve core 3 and the second valve core 4 are in the above-mentioned dynamic equilibrium state.

[0094] At this time, although the first valve core 3 moves a distance toward the end cover 5 (to the right in Figure 4), it only causes the core part located outside the first liquid ring groove Ad to block a portion of the pilot return liquid channel Tx, but has not yet connected to the pilot liquid inlet channel Px.

[0095] As shown in FIG5 , if the connection state of each chamber needs to be changed through the first valve core 3, the second valve core 4 needs to be moved further toward the end cover 5 (to the right in FIG5 ). Utilizing the valve core following action described above, the first valve core 3 continues to move to the right. By controlling the second valve core 4 to continue to move in the first direction, the first valve core 3 is placed in a following state to regulate the output or input of fluid medium to the corresponding working port. As shown in FIG5 , when the second valve core 4 continues to move toward the end cover 5 (to the right in FIG5 ) to the connecting position, the following action causes the first valve core 3 to move to the first liquid ring groove Ad and connect with the liquid inlet ring groove P. Simultaneously, the pilot liquid return channel Tx is blocked to prevent liquid from entering the pilot liquid return ring groove Ta. The second liquid ring groove Bd is fully connected to the corresponding liquid return ring groove. Thus, the first liquid ring groove Ad of the first valve core 3 is always connected to the first working port A, and the second liquid ring groove Bd of the first valve core 3 is always connected to the second working port B.

[0096] When the first valve core 3 is in the follow-up state, the distance moved by the first valve core 3 is the same as the distance moved by the second valve core 4. In this way, the movement direction and distance of the first valve core 3 completely follow the movement direction and distance of the second valve core 4.

[0097] In particular, since there is a follow-up state between the first valve core 3 and the second valve core 4, even if the first valve core 3 changes the connectivity state of each chamber so that the liquid flows between the chambers, if the position of the second valve core 4 does not change, the dynamic position of the first valve core 3 will not change; and since the medium flow through the hydraulic valve is positively correlated with the opening of the first valve core 3 (that is, the relative position between the first valve core 4 and the liquid inlet ring groove P of the valve sleeve 2), the position of the first valve core 3 can be controlled by the position of the second valve core 4, thereby ultimately achieving the regulation of the output to the corresponding working port or the output of a certain flow of fluid medium.

[0098] Figure 6 shows that when the first valve core 3 moves to the first liquid-transmitting ring groove Ad and is just connected to the liquid-inlet ring groove P, when the first valve core 3 has a locking structural size, the first valve core 3 just completely blocks the pilot return liquid channel Tx, so that the working port is not connected to either the pilot liquid-inlet channel Px or the pilot return liquid channel Tx. In other embodiments, when the first valve core 3 has a non-locking structural size, the size of the first valve core 3 is set so that it can only block one of the pilot liquid-inlet channel Px and the pilot return liquid channel Tx. For example, the pilot return liquid channel Tx can be completely blocked first, and then the first liquid-transmitting ring groove Ad can be connected to the liquid-inlet ring groove P by moving the first valve core 3. At this time, a locked state in which the working port is neither connected to the liquid inlet nor the liquid return port will be achieved. As shown in Figures 7 and 8, the first valve core 3 and the second valve core 4 continue to move toward the end cover 5 (to the right in Figure 7) until the right end surface of the first valve core 3 abuts the end cover and reaches a preset limit position. At this point, even if there is high-pressure liquid in the first control chamber KA, the generated liquid pressure will be transmitted to the end cover, preventing it from moving. At the same time, a limit device (not shown) is provided for the second valve core 4 to prevent the movement of the second valve core 4 from exceeding the preset limit position. During the entire control process of the second valve core 4, the pilot liquid inlet channel Px is always connected to the liquid inlet, and the first pilot return liquid annular groove Ta and the second pilot return liquid annular groove Tb are always connected to the return liquid port.

[0099] Due to the symmetrical arrangement of the first valve core 3 and the second valve core 4, at any position described above, reducing the opening of the first valve core 3 or switching the flow to the second working port B is accomplished by simply moving the second valve core 4 to the other side, i.e., the second direction (i.e., left in the figure). In other words, by moving the second valve core 4 left or right, the connection direction and flow rate of the three-position, four-way directional valve can be adjusted arbitrarily.

[0100] The disclosed embodiment replaces the pressure control in the prior art solution with position control of multiple valve cores in switching and flow regulation, and has outstanding advantages such as more precise control and lower control difficulty, while also having the characteristics of compact and simple structure.

[0101] Based on the same inventive concept as the first embodiment described above, the second embodiment of the present disclosure provides a control device for a three-position four-way reversing valve, comprising a first control module and a second control module coupled to each other, wherein:

[0102] a first control module, configured to control the second valve core to move in a first direction to a working position, wherein a core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return liquid passage, and high-pressure liquid entering through the pilot liquid inlet passage enters the first control chamber through the third liquid ring groove and an internal passage of the second valve core to drive the first valve core to move in the first direction;

[0103] The second control module is used to control the second valve core to stop moving, and the first valve core is moved to disconnect the connection between the third liquid ring groove and the pilot liquid inlet channel, and at the same time connect the third liquid ring groove with the pilot return liquid channel on the corresponding side. The high-pressure liquid in the first control chamber is discharged through the pilot return liquid channel, so that the first valve core and the second valve core are in a dynamic equilibrium state.

[0104] The control device can realize the functions of any one of the technical solutions in the first embodiment mentioned above.

[0105] The disclosed embodiment replaces the pressure control in the prior art solution with position control of multiple valve cores in switching and flow regulation, which has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0106] A third embodiment of the present disclosure provides a storage medium storing a computer program. When the computer program is executed by a processor, the steps of implementing the above control method include:

[0107] S11, controlling the second valve core to move in the first direction to the working position, wherein the core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return liquid channel, and the high-pressure liquid entering through the pilot liquid inlet channel enters the first control chamber through the third liquid ring groove and the internal channel of the second valve core, thereby driving the first valve core to move in the first direction;

[0108] S12, controls the second valve core to stop moving, and disconnects the connection between the third liquid ring groove and the pilot liquid inlet channel through the movement of the first valve core, and at the same time connects the third liquid ring groove with the pilot return liquid channel on the corresponding side, and the high-pressure liquid in the first control chamber is discharged through the pilot return liquid channel, so that the first valve core and the second valve core are in a dynamic equilibrium state.

[0109] Of course, other steps of the control method can also be used to implement the above embodiment.

[0110] The disclosed embodiment replaces the pressure control in the prior art solution with position control of multiple valve cores in switching and flow regulation, which has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0111] A fourth embodiment of the present disclosure provides an electronic device, the electronic device including at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above control method when executing the computer program in the memory, specifically including:

[0112] S21, controlling the second valve core to move in the first direction to the working position, wherein the core portion of the second valve core located on one side of the third liquid ring groove completely blocks the pilot return liquid channel, and the high-pressure liquid entering through the pilot liquid inlet channel enters the first control chamber through the third liquid ring groove and the internal channel of the second valve core, thereby driving the first valve core to move in the first direction;

[0113] S22: Control the second valve core to stop moving. The first valve core moves to disconnect the third liquid annular groove from the pilot liquid inlet channel. Simultaneously, the third liquid annular groove is connected to the corresponding pilot liquid return channel. The high-pressure liquid in the first control chamber is discharged through the pilot liquid return channel, placing the first valve core and the second valve core in a dynamic equilibrium state. This can also be used to implement other steps of the control method of the above embodiment.

[0114] The disclosed embodiment replaces the pressure control in the prior art solution with position control of multiple valve cores in switching and flow regulation, which has outstanding advantages such as more precise control and lower control difficulty, and also has the characteristics of compact and simple structure.

[0115] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0116] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0117] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0118] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0119] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0120] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0121] If the integrated module is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of the above-mentioned motor torque control method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0122] In addition, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily to be understood as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0123] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A three-position four-way directional control valve, characterized in that It includes a valve body and an end cover. A valve sleeve, a first valve core and a second valve core are arranged inside the valve body. The first valve core is movably arranged inside the valve sleeve, and the second valve core is movably arranged inside the first valve core. By moving the second valve core and driving the movement of the first valve core, the control of liquid flow is achieved.

2. The three-position four-way reversing valve according to claim 1, characterized in that, The valve sleeve adopts a cylindrical structure. An inlet liquid ring groove, a first working ring groove, a second working ring groove and two return liquid ring grooves are arranged on the outer wall of the valve sleeve. The first working ring groove and the second working ring groove are symmetrically arranged with respect to the center line of the inlet liquid ring groove, and the two return liquid ring grooves are symmetrically arranged with respect to the center line of the inlet liquid ring groove.

3. The four-way three-position directional control valve according to claim 2, characterized in that, An inlet liquid port, a return liquid port, a first working port and a second working port are arranged on the valve body; the inlet liquid port communicates the system inlet liquid with the inlet liquid ring groove, the return liquid port communicates the system return liquid with the two return liquid ring grooves, the first working port communicates the actuator with the first working ring groove, and the second working port communicates the actuator with the second working ring groove.

4. The four-way three-position directional control valve according to claim 3, characterized in that, The first valve core has a locked state during the moving process.

5. The four-way three-position directional control valve according to claim 4, characterized in that, When the first valve core is in the locked state, the working port is neither communicated with the inlet liquid port nor with the return liquid port.

6. The four-way three-position directional control valve according to claim 2, characterized in that Radial liquid passing holes are arranged in the inlet liquid ring groove, the first working ring groove, the second working ring groove and the two return liquid ring grooves. Through the radial liquid passing holes, the liquid in each ring groove enters the inside of the valve sleeve.

7. The four-way three-position directional control valve according to claim 2, characterized in that, Sealing rings are arranged between the inlet liquid ring groove, the first working ring groove, the second working ring groove and the two return liquid ring grooves.

8. The four-way three-position directional control valve according to claim 2, characterized in that, A pilot inlet liquid channel is arranged in the middle of the first valve core. Pilot return liquid channels are symmetrically arranged on both sides of the pilot inlet liquid channel. A first liquid passing ring groove and a second liquid passing ring groove are respectively arranged between the pilot inlet liquid channel and each pilot return liquid channel. A first pilot return liquid ring groove and a second pilot return liquid ring groove are respectively arranged outside the two pilot return liquid channels.

9. The three-position four-way directional control valve according to claim 1, wherein, Third liquid passing ring grooves and fourth liquid passing ring grooves are symmetrically arranged on the outer wall of the second valve core. The third liquid passing ring groove and the fourth liquid passing ring groove are respectively communicated with the end faces on both sides of the second valve core through internal liquid passing channels.

10. The four-way three-position directional control valve according to claim 1, characterized in that, On the side of the valve body far from the end cover, the inner wall of one side of the valve body, the end face of the first valve core and the end face of the second valve core enclose to form a first control cavity; on the other side of the valve body close to the end cover, the end face of the first valve core, the end face of the second valve core and the end face of the end cover enclose to form a second control cavity.

11. The four-way three-position directional control valve according to claim 1, characterized in that, Springs are respectively arranged at both ends of the first valve core. One ends of the two springs are connected to the end face of the first valve core, and the other ends of the two springs respectively abut against the bottom surface of the valve body and the inner surface of the end cover.

12. The three-position four-way reversing valve according to claim 1, characterized in that, The end of the second valve core facing the end cover is connected to the first end of a connecting rod, and a driving assembly for driving the second valve core to reciprocate is connected to the second end of the connecting rod.

13. A control method for a three-position four-way directional control valve, characterized in that, It includes: Control the second spool to move towards the first direction to the working position. The core body part of the second spool on one side of the third liquid passing ring groove completely blocks the pilot return liquid channel. The high-pressure liquid entering through the pilot inlet liquid channel enters the first control cavity through the third liquid passing ring groove and the internal channel of the second spool to drive the first spool to move in the first direction; Control the second spool to stop moving. By the movement of the first spool, the communication between the third liquid passing ring groove and the pilot inlet liquid channel is disconnected, and at the same time, the third liquid passing ring groove is communicated with the corresponding side pilot return liquid channel. The high-pressure liquid in the first control cavity is discharged through the pilot return liquid channel, so that the first spool and the second spool are in a dynamic balance state.

14. The control method according to claim 13, wherein Before controlling the second spool to move towards the first direction to the working position, it further includes: Control the second spool to move from the zero position control state towards the first direction to the dynamic balance position. The third liquid passing ring groove of the second spool is communicated with the pilot inlet liquid channel. The core body part of the second spool on one side of the third liquid passing ring groove just blocks the corresponding side pilot return liquid channel, so that the first spool and the second spool are in a dynamic balance state.

15. The control method according to claim 14, characterized in that, When the first spool is in the zero position control state, the first liquid passing ring groove communicates the first working ring groove with the corresponding return liquid ring groove on one side, and the second liquid passing ring groove communicates the second working ring groove with the corresponding return liquid ring groove on the other side.

16. The control method according to claim 13, wherein After the first spool and the second spool are in the dynamic balance state, it further includes: Control the second spool to continue to move towards the first direction. The first spool is in a follow-up state to regulate the output or input of fluid medium to the corresponding working port.

17. The control method according to claim 16, characterized in that, When the first spool is in the follow-up state, the moving distance of the first spool is the same as the moving distance of the second spool.

18. The control method according to claim 17, characterized in that, When the first spool is in the follow-up state, when the first spool moves to the position where the first liquid passing ring groove is communicated with the inlet liquid ring groove and the second liquid passing ring groove is completely communicated with the corresponding side return liquid ring groove, the first liquid passing ring groove is communicated with the first working port, and the second liquid passing ring groove is communicated with the second working port.

19. The control method according to claim 18, wherein, It further includes: Control the second spool to continue to move towards the first direction until the end face of the first spool or the second spool abuts against the inner wall of the end cover or the valve body to reach the preset limit position.

20. The control method according to claim 19, wherein The pilot inlet liquid channel is communicated with the inlet port, and the first pilot return liquid ring groove and the second pilot return liquid ring groove are always communicated with the return port.

21. The control method according to claim 13, wherein It further includes: When reducing the opening of the first spool or switching the output of the working port, control the second spool to move in the second direction.

22. A control device for a three-position four-way directional control valve, characterized in that, It includes: The first control module is used to control the second spool to move towards the first direction to the working position. The core body part of the second spool on one side of the third liquid passing ring groove completely blocks the pilot return liquid channel. The high-pressure liquid entering through the pilot inlet liquid channel enters the first control cavity through the third liquid passing ring groove and the internal channel of the second spool to drive the first spool to move in the first direction; The second control module is used to control the second spool to stop moving. By the movement of the first spool, the communication between the third liquid passing ring groove and the pilot inlet liquid channel is disconnected, and at the same time, the third liquid passing ring groove is communicated with the corresponding side pilot return liquid channel. The high-pressure liquid in the first control cavity is discharged through the pilot return liquid channel, so that the first spool and the second spool are in a dynamic balance state.

Images