Valve element follow-up type water-based proportional reversing valve

Abstract

The utility model relates to the technical field of hydraulic control, and provides a valve core follow-up type water-based proportional directional valve, which comprises a valve body, a valve core follow-up type water-based proportional directional valve and a valve core follow-up type water-based proportional directional valve, the main valve core is movably arranged in the valve body and is connected with the valve body to form a main valve core control cavity; the pilot valve assembly is arranged in the valve body and comprises a pilot valve element, a ball and an ejector rod, the pilot valve element is installed on one side of the main valve element, the pilot valve element is provided with a liquid passing cavity communicated with the liquid inlet, the liquid passing cavity is communicated with the main valve element control cavity, the main valve element control cavity is connected with the liquid return opening, and the ball is movably installed in the liquid passing cavity; one end of the ball is connected with the pilot valve element through a first elastic piece, and the other end of the ball is connected with the ejector rod. The liquid inlet flow can be controlled through movement of the main valve element along with the pilot valve ejector rod, the reversing valve can automatically recover to the balance state, and the control precision and the control convenience of the reversing valve are improved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, specifically to a valve core follow-up type water-based proportional directional valve. Background Technology

[0002] Currently, in coal mining, on-off proportional directional valves are used to control the movement of hydraulic supports. These valves only have two operating states: "fully open" and "fully closed," meaning the hydraulic supports can only move at a constant speed. This makes it difficult to precisely control the posture and push / slide of the hydraulic supports, and it also cannot achieve soft-start of the hydraulic cylinders, affecting their service life and reducing the quality of the working face support. Furthermore, it affects the straightness of the scraper conveyor, shortening its lifespan. In addition, existing proportional directional valves have complex structures and slow response times, resulting in poor control accuracy. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a valve core follow-up water-based proportional directional valve, so as to at least solve the technical problem of poor control accuracy of the proportional directional valve in the prior art, which affects the service life of the controlled load such as the hydraulic cylinder.

[0004] To solve the above-mentioned technical problems, the embodiments of this utility model adopt the following technical solutions:

[0005] This utility model embodiment provides a valve core follower type water-based proportional directional valve, including:

[0006] The valve body has an inlet and a return port.

[0007] The main valve core is movably disposed within the valve body and connected to the valve body to form the main valve core control chamber;

[0008] A pilot valve assembly, disposed within the valve body, includes a pilot valve core, a ball, and a push rod. The pilot valve core is mounted on one side of the main valve core and has a liquid passage chamber communicating with the liquid inlet. The liquid passage chamber is connected to the control chamber of the main valve core, which is connected to the liquid return port. The ball is movably mounted within the liquid passage chamber. One end of the ball is connected to the pilot valve core via a first elastic element, and the other end of the ball is connected to the push rod.

[0009] The push rod can exert force on the ball to control the communication state of the liquid passage chamber, thereby adjusting the pressure of the main valve core control chamber and pushing the main valve core to move with the push rod.

[0010] In some embodiments, the pilot valve core is embedded at one end of the main valve core, and a first flow channel is formed between the main valve core and the pilot valve core.

[0011] The liquid passage cavity is provided with a ball seat for mounting the ball, and a second flow channel is provided between the ball seat and the liquid passage cavity.

[0012] In some embodiments, the valve core follow-up type water-based proportional directional valve further includes a main valve sleeve, which is movably disposed in the valve body. The main valve sleeve is connected to the valve body to form a main valve sleeve control cavity, and the main valve sleeve is connected to the main valve core to form a main valve core control cavity. The main valve sleeve control cavity and the main valve core control cavity are in communication.

[0013] In some embodiments, the main valve core is connected to the main valve sleeve from a first end, and the push rod extends into the main valve sleeve from a second end.

[0014] The main valve sleeve has a pilot valve return chamber that connects to the return port. There is a third flow channel between the push rod and the main valve sleeve. One end of the third flow channel is connected to the main valve core control chamber, and the other end of the third flow channel is connected to the pilot valve return chamber.

[0015] In some embodiments, the flow cross-section of the second flow channel is larger than the flow cross-section of the third flow channel.

[0016] In some embodiments, the main valve core is provided with a first damping orifice communicating with the liquid inlet and the liquid passage chamber.

[0017] The first damping orifice is disposed radially toward the liquid inlet of the main valve core, and a liquid inlet channel is provided between the first damping orifice and the liquid passage, the liquid inlet channel being disposed axially along the main valve core.

[0018] In some embodiments, the main valve sleeve is provided with a second damping hole that connects the main valve sleeve control cavity and the main valve core control cavity, and the second damping hole is arranged along the axial direction of the main valve sleeve.

[0019] In some embodiments, the main valve sleeve is further provided with a third damping hole that connects the pilot valve return chamber and the return port.

[0020] In some embodiments, a gap exists between the main valve sleeve and the valve body to form a return channel connecting the return port and the third damping orifice.

[0021] In some embodiments, the valve core follow-up type water-based proportional directional valve further includes a drive mechanism connected to the push rod, wherein the drive mechanism is an electric push rod or a linear motor.

[0022] This utility model provides a valve core-driven water-based proportional directional valve. An inlet and a return port are provided on the valve body. A main valve core is movably disposed within the valve body and connected to it to form a main valve core control chamber. A pilot valve core of a pilot valve assembly is connected to the main valve core. A liquid passage chamber communicating with the inlet is provided on the pilot valve core. The liquid passage chamber is connected to the main valve core control chamber, which is also connected to the return port. A ball is movably installed within the liquid passage chamber. One end of the ball is connected to the pilot valve core via a first elastic element, and the other end of the ball is connected to the main valve core. The aforementioned push rod connection allows the pilot valve port to be affected by the movement of a ball within the liquid passage chamber when the push rod is subjected to force. This movement causes the pilot valve port to change from a balanced state to a continuously open or continuously closed state, thereby affecting the working pressure of the main valve core control chamber. This pushes the main valve core to follow the push rod until it has moved the same distance as the push rod, restoring the pilot valve port to a balanced state. This enables the main valve core to control the inlet flow rate by moving with the pilot valve push rod, and also allows the water-based proportional directional valve to automatically return to a balanced state, improving the control accuracy and convenience of the water-based proportional directional valve, and ultimately extending the service life of the controlled load. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the valve core follow-up type water-based proportional directional valve according to an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 A magnified schematic diagram of a portion of the structure.

[0026] Figure label:

[0027] 1-Valve body, 11-Inlet, 12-Return port; 2-Main valve core, 21-Main valve core control chamber, 22-Main valve core hole, 23-Load interface, 24-Mounting groove, 25-First damping hole, 26-Inlet channel; 31-Pilot valve core, 311-Passing chamber, 312-Pilot valve port, 32-Ball, 33-Push rod, 331-Push rod mounting seat, 34-First elastic element, 35-Pilot valve return chamber, 36-Ball seat; 41-First flow channel, 42-Second flow channel, 43-Third flow channel; 5-Main valve sleeve, 51-Main valve sleeve control chamber, 52-Second damping hole, 53-Third damping hole; 6-Return channel; 7-Second elastic element; 8-Drive mechanism. Detailed Implementation

[0028] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0029] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0030] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0031] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0032] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0033] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0034] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0035] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0036] Figure 1 and Figure 2 A schematic diagram of the structure of a valve core-driven water-based proportional directional valve according to an embodiment of this utility model is shown. Figure 1 and Figure 2 As shown in the figure, an embodiment of the present invention provides a valve core follow-up type water-based proportional directional valve, comprising:

[0037] Valve body 1, wherein the valve body 1 is provided with an inlet 11 (P port) and an outlet 12 (T port);

[0038] The main valve core 2 is movably disposed within the valve body 1 and is connected to the valve body 1 to form the main valve core control cavity 21;

[0039] A pilot valve assembly, disposed within the valve body 1, includes a pilot valve core 31, a ball 32, and a push rod 33. The pilot valve core 31 is mounted on one side of the main valve core 2. The pilot valve core 31 has a liquid passage chamber 311 communicating with the liquid inlet 11. The liquid passage chamber 311 is communicating with the main valve core control chamber 21, and the main valve core control chamber 21 is communicating with the liquid return port 12. The ball 32 is movably mounted within the liquid passage chamber 311. One end of the ball 32 is connected to the pilot valve core 31 via a first elastic element 34, and the other end of the ball 32 is connected to the push rod 33.

[0040] The push rod 33 can exert force on the ball 32 to control the connection state of the liquid passage chamber 311, thereby adjusting the pressure of the main valve core control chamber 21 and pushing the main valve core 2 to move with the push rod 33.

[0041] Specifically, a pilot valve return chamber 35 is provided between the main valve core control chamber 21 and the return port 12. When the push rod 33 is forced to move to the left, the push rod 33 pushes the ball 32 to move to the left, and the right side of the ball 32 disengages from the cavity wall of the liquid passage chamber 311, so that the right end of the liquid passage chamber 311 (this cavity is the pilot valve port 312 of the pilot valve core 31) opens, so that the liquid passage chamber 311 is connected to the main valve core control chamber 21. The high pressure liquid enters the main valve core control chamber 21 and the pilot valve return chamber 35 after passing through the inlet port 11 and the liquid passage chamber 311 in sequence. The pressure in the main valve core control chamber 21 increases, and the high pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left together until the inner wall of the liquid passage chamber 311 contacts the ball 32, closing the right end of the liquid passage chamber 311 and restoring the pilot valve port 312 to the equilibrium state.

[0042] During the movement of the push rod 33 to the left, the distance the push rod 33 moves to the left can be controlled, which in turn controls the distance the main valve core 2 moves to the left (the two move the same distance), thereby controlling the opening between the inlet 11 and the main valve core hole 22 of the main valve core 2, and thus controlling the flow rate of the main valve core 2 to the controlled load. The main valve core 2 is provided with a load interface 23 for connecting to the controlled load (e.g., a hydraulic cylinder). When the push rod 33 controls the main valve core 2 to move to the left and stops at a certain position, the opening between the inlet 11 and the main valve core hole 22 of the main valve core 2 is controlled.

[0043] When the push rod 33 is moved to the right under force, the push rod 33 disengages from the ball 32. Under the action of the spring force and hydraulic pressure to the right, the ball 32 pushes its right side to contact the cavity wall of the liquid passage 311, closing the pilot valve port 312 of the pilot valve core 31, so that the high pressure liquid flowing from the liquid inlet 11 into the liquid passage 311 cannot flow into the main valve core control cavity 21. When the pilot valve port 312 is closed, the liquid in the main valve core control chamber 21 enters the pilot valve return chamber 35 and then flows out through the return port 12, causing a decrease in pressure in the main valve core control chamber 21. The ball 32 moves to the right under the force of the liquid in the through chamber 311 located to the left of the main valve core control chamber 21 and the elastic force of the first elastic element 34. The ball 32 contacts the push rod 33 again until the rightmost side of the ball 32 disengages from the cavity wall of the through chamber 311. The pilot valve port 312 of the pilot valve core 31 then opens. After the pilot valve port 312 opens, similar to the push rod 33 moving to the left and pushing the main valve core 2 to the left, the through chamber 311 and the... The main valve core control chamber 21 is connected. High-pressure liquid enters the main valve core control chamber 21 and the pilot valve return chamber 35 after passing through the inlet 11 and the liquid passage chamber 311 in sequence. The pressure in the main valve core control chamber 21 increases, and the high-pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left together until the inner wall of the liquid passage chamber 311 contacts the ball 32, closing the right end of the liquid passage chamber 311 and restoring the pilot valve port 312 to a balanced state. That is, the main valve core 2 moves to the right first and then to the left with the movement of the push rod 33 to the right until the pressure on both sides of the ball 32 is balanced, at which point the left and right movement stops, and the pilot valve port 312 returns to a balanced state. During this process, when the push rod 33 moves to the right and controls the movement of the main valve core 2 to stop at a certain position (the stopping position of the push rod 33 moving to the right), it controls the opening between the inlet 11 and the main valve core hole 22 of the main valve core 2.

[0044] It should be noted that when the push rod 33 is moved to the right under force, the ball 32 moves to the right under the action of the hydraulic pressure on the left side and the elastic force of the first elastic element 34. During this process, the pilot valve core 31 also moves to the right under the push of the liquid in the liquid passage chamber 311. After the ball 32 moves to contact and abuts the push rod 33, the rightmost side of the ball 32 separates from the cavity wall of the liquid passage chamber 311, opening the pilot valve port 312 of the pilot valve core 31.

[0045] It should be noted that during the process of the main valve core 2 moving to the left with the push rod 33, some high-pressure liquid will also flow to the return port 12. Therefore, the opening of the return port 12 or the opening of the pilot valve return chamber 35 connected to the return port 12 can be reduced so that the return flow rate of the reversing valve is less than the inlet flow rate, thus ensuring that the main valve core 2 moves to the left as a whole.

[0046] The valve core-driven water-based proportional directional valve provided in this embodiment of the utility model has an inlet 11 and a return port 12 on the valve body 1. The main valve core 2 is movably disposed within the valve body 1 and connected to the valve body 1 to form a main valve core control chamber 21. The pilot valve core 31 of the pilot valve assembly is connected to the main valve core 2. A liquid passage chamber 311 communicating with the inlet 11 is formed on the pilot valve core 31. The liquid passage chamber 311 is connected to the main valve core control chamber 21, and the main valve core control chamber 21 is connected to the return port 12. A ball 32 is movably installed in the liquid passage chamber 311. One end of the ball 32 is connected to the pilot valve core 31 through a first elastic element 34. The other end of the ball 32 is connected to the push rod 33. When the push rod 33 is moved by force, the movement of the ball 32 in the liquid passage chamber 311 can affect the state of the pilot valve port 312, causing it to change from a balanced state to a continuously open or continuously closed state. This, in turn, affects the working pressure of the main valve core control chamber, pushing the main valve core 2 to follow the push rod 33 until the main valve core 2 follows the push rod to move the same distance, so that the pilot valve port 312 returns to a balanced state. This enables the main valve core 2 to control the liquid flow rate as it moves with the pilot valve push rod, and also enables the water-based proportional directional valve to automatically return to a balanced state, improving the control accuracy and convenience of the water-based proportional directional valve, thereby increasing the service life of the controlled load.

[0047] In some embodiments, the pilot valve core 31 is embedded at one end of the main valve core 2, and a first flow channel 41 is provided between the main valve core 2 and the pilot valve core 31.

[0048] The liquid passage cavity 311 is provided with a ball seat 36 for mounting the ball 32, and a second flow channel 42 is provided between the ball seat 36 and the liquid passage cavity 311.

[0049] The main valve core 2 has an installation groove 24 for installing the pilot valve core 31. There is a gap between the bottom of the installation groove 24 and the first end of the pilot valve core 31 to form a first flow channel 41.

[0050] The mounting groove 24 is preferably a T-shaped groove with a limiting part, and the pilot valve core 31 is connected to the mounting groove 24 to reliably connect the main valve core 2 and the pilot valve core 31.

[0051] The ball seat 36 is installed in the liquid passage chamber 311, and one end of the ball seat 36 is provided with a connecting part for installing the first elastic member 34. The first elastic member 34 is sleeved on the connecting part and located between the bottom of the mounting groove 24 and one end of the ball seat 36. The other end of the ball seat 36 is provided with a ball groove for installing the ball 32. The outer wall of the ball seat 36 near the ball groove and the inner wall of the liquid passage chamber 311 form a second flow channel 42, so that the high pressure liquid entering the valve body 1 from the liquid inlet 11 can enter the liquid passage chamber 311 through the first flow channel 41 and flow out from the liquid passage chamber 311 to the main valve core control chamber 21 through the second flow channel 42.

[0052] In some embodiments, the valve core follow-up type water-based proportional directional valve further includes a main valve sleeve 5, which is movably disposed within the valve body 1. The main valve sleeve 5 is connected to the valve body 1 to form a main valve sleeve control cavity 51, and the main valve sleeve 5 is connected to the main valve core 2 to form a main valve core control cavity 21. The main valve sleeve control cavity 51 and the main valve core control cavity 21 are in communication.

[0053] like Figure 1 and Figure 2 As shown, the main valve sleeve control chamber 51 is located to the right of the main valve core control chamber 21. When the high-pressure liquid in the main valve core control chamber 21 pushes the pilot valve core 31 and the main valve core 2 to move to the left together, some of the high-pressure liquid in the main valve core control chamber 21 will flow into the main valve sleeve control chamber 51, pushing the main valve sleeve 5 to move to the left, blocking and sealing the return port 12, and ensuring that the main valve core 2 moves with the push rod 33. In this way, through the linkage of the main valve sleeve 5 and the main valve core 2, the required control components can be reduced (reducing the control of the return port 12), ensuring the linkage control of the water-based proportional directional valve, and further improving the control accuracy.

[0054] In some embodiments, the main valve core 2 is connected to the main valve sleeve 5 from a first end, and the push rod 33 extends into the main valve sleeve 5 from a second end.

[0055] The main valve sleeve 5 is provided with a pilot valve return chamber 35 that connects to the return port 12. The push rod 33 and the main valve sleeve 5 have a third flow channel 43. One end of the third flow channel 43 is connected to the main valve core control chamber 21, and the other end of the third flow channel 43 is connected to the pilot valve return chamber 35.

[0056] The main valve core 2 connects to the main valve sleeve 5 at the first end, forming a cavity that is the main valve core control cavity 21. The push rod 33 can extend from the second end of the main valve sleeve 5 into the main valve sleeve 5 (the main valve core control cavity 21) and connect with the ball 32. The main valve sleeve 5 has a pilot valve return cavity 35 opened radially on it, and an installation cavity connected to the push rod 33 opened axially on it. There is a gap between the push rod 33 and the cavity wall of the installation cavity to form a third flow channel 43. In this way, there is no need to set a special flow channel in the main valve sleeve 5 to connect the main valve core control cavity 21 with the pilot valve return cavity 35, and the pilot valve return cavity 35 is opened on the main valve sleeve 5, which is convenient for processing.

[0057] In other embodiments, a push rod mounting seat 331 is installed in the mounting cavity, and the push rod 33 extends into the main valve core control cavity 21 through the push rod mounting seat 331. There is a gap between the push rod 33 and the push rod mounting seat 331 to form the aforementioned third flow channel 43. The push rod mounting seat 331 facilitates assembly.

[0058] In some embodiments, the flow cross-section of the second flow channel 42 is larger than the flow cross-section of the third flow channel 43.

[0059] When the pilot valve port 312 is opened, the flow cross-section of the second flow channel 42 is larger than that of the third flow channel 43, so the inlet velocity of the reversing valve is greater than or equal to the outlet velocity. The pressure in the main valve core control chamber 21 increases, which drives the main valve core 2 to move. When the pilot valve port 312 is closed, since there is no working fluid flowing out, the main valve core control chamber 21 can be naturally depressurized to a low pressure. This can greatly simplify the structure of the follower valve core and improve the follower control effect.

[0060] In some embodiments, the main valve core 2 is provided with a first damping orifice 25 that connects the liquid inlet 11 and the liquid passage chamber 311.

[0061] The first damping orifice 25 is disposed radially toward the liquid inlet 11 along the main valve core 2, and a liquid inlet channel 26 is provided between the first damping orifice 25 and the liquid passage 311, the liquid inlet channel 26 being disposed axially along the main valve core 1. The first damping orifice 25 and the liquid inlet channel 26 facilitate the rapid guidance of the high-pressure liquid entering through the liquid inlet 11 to the liquid passage 311.

[0062] In some embodiments, the main valve sleeve 5 is provided with a second damping hole 52 that connects the main valve sleeve control cavity 51 and the main valve core control cavity 21. The second damping hole 52 is arranged along the axial direction of the main valve sleeve 5 to facilitate the introduction of high-pressure fluid into the main valve sleeve control cavity 51.

[0063] In some embodiments, the main valve sleeve 5 is further provided with a third damping hole 53 that connects the pilot valve return chamber 35 and the return port 12, so as to facilitate the liquid in the pilot valve return chamber 35 to be led out to the return port 12. The third damping hole 53 is preferably arranged at an angle to reduce the return path.

[0064] In some embodiments, there is a gap between the main valve sleeve 5 and the valve body 1 to form a return channel 6 that connects the return port 12 and the third damping hole 53, which facilitates return of liquid. The return channel 6 can be formed by machining a groove on the outer periphery of the main valve sleeve 5, which is easy to process.

[0065] like Figure 1 and Figure 2 As shown, a second elastic element 7 is also sleeved on the outer periphery of the main valve core 2. The second elastic element 7 is located on the side close to the load interface 23 so that after the main valve core 2 moves to the left, the elastic force of the second elastic element 7 pushes the main valve core 2 to move to the right to reset.

[0066] like Figure 1 As shown, the valve core follow-up type water-based proportional directional valve also includes a drive mechanism 8 connected to the push rod 33, and the drive mechanism 8 is an electric push rod or a linear motor.

[0067] The main valve core 2, pilot valve core 31, and push rod 33 are arranged sequentially along the axial direction of the valve body 1. For convenient control, an electric push rod or linear motor connected to the push rod 33 is provided on one side of the valve body 1 along the axial direction, which facilitates the linear movement of the push rod 33 and improves the control effect of the water-based proportional directional valve. Furthermore, the valve core-following type water-based proportional directional valve is arranged axially as a whole, making it suitable for situations with limited space, thus expanding the applicability of the water-based proportional directional valve.

[0068] In this embodiment, other liquid inlet channels or liquid return channels can be machined on the main valve core 2, the main valve sleeve 5, and other components inside the valve body 1 according to specific needs. The specific structure of the liquid inlet channel or liquid return channel is not specifically limited in this utility model.

[0069] The above description is merely a preferred embodiment of this utility model and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in this utility model is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this utility model.

[0070] Furthermore, although the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0071] Although the subject matter has been described using language specific to structural features and / or methodological logic, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are merely illustrative examples of implementing the claims.

Claims

1. A valve core-driven water-based proportional directional valve, characterized in that, include: The valve body has an inlet and a return port. The main valve core is movably disposed within the valve body and connected to the valve body to form the main valve core control chamber; A pilot valve assembly, disposed within the valve body, includes a pilot valve core, a ball, and a push rod. The pilot valve core is mounted on one side of the main valve core and has a liquid passage chamber communicating with the liquid inlet. The liquid passage chamber is connected to the control chamber of the main valve core, which is connected to the liquid return port. The ball is movably mounted within the liquid passage chamber. One end of the ball is connected to the pilot valve core via a first elastic element, and the other end of the ball is connected to the push rod. The push rod can exert force on the ball to control the communication state of the liquid passage chamber, thereby adjusting the pressure of the main valve core control chamber and pushing the main valve core to move with the push rod.

2. The valve core follow-up type water-based proportional directional valve according to claim 1, characterized in that, The pilot valve core is embedded at one end of the main valve core, and a first flow channel is formed between the main valve core and the pilot valve core. The liquid passage cavity is provided with a ball seat for mounting the ball, and a second flow channel is provided between the ball seat and the liquid passage cavity.

3. The valve core follow-up type water-based proportional directional valve according to claim 2, characterized in that, The valve core follow-up water-based proportional directional valve also includes a main valve sleeve, which is movably disposed within the valve body. The main valve sleeve is connected to the valve body to form a main valve sleeve control chamber, and the main valve sleeve is connected to the main valve core to form a main valve core control chamber. The main valve sleeve control chamber and the main valve core control chamber are in communication.

4. The valve core follow-up type water-based proportional directional valve according to claim 3, characterized in that, The main valve core is connected to the main valve sleeve from the first end, and the push rod extends into the main valve sleeve from the second end. The main valve sleeve has a pilot valve return chamber that connects to the return port. There is a third flow channel between the push rod and the main valve sleeve. One end of the third flow channel is connected to the main valve core control chamber, and the other end of the third flow channel is connected to the pilot valve return chamber.

5. The valve core follow-up type water-based proportional directional valve according to claim 4, characterized in that, The flow cross-section of the second flow channel is larger than that of the third flow channel.

6. The valve core-driven water-based proportional directional valve according to claim 1, characterized in that, The main valve core is provided with a first damping orifice that connects the liquid inlet and the liquid passage chamber. The first damping orifice is disposed radially toward the liquid inlet of the main valve core, and a liquid inlet channel is provided between the first damping orifice and the liquid passage, the liquid inlet channel being disposed axially along the main valve core.

7. The valve core-driven water-based proportional directional valve according to claim 3, characterized in that, The main valve sleeve is provided with a second damping hole that connects the main valve sleeve control cavity and the main valve core control cavity, and the second damping hole is arranged along the axial direction of the main valve sleeve.

8. The valve core-driven water-based proportional directional valve according to claim 4, characterized in that, The main valve sleeve is also provided with a third damping hole that connects the pilot valve return chamber and the return port.

9. The valve core follow-up type water-based proportional directional valve according to claim 8, characterized in that, There is a gap between the main valve sleeve and the valve body to form a return channel connecting the return port and the third damping orifice.

10. The valve core-driven water-based proportional directional valve according to claim 1, characterized in that, The valve core follow-up type water-based proportional directional valve also includes a drive mechanism connected to the push rod, which is an electric push rod or a linear motor.

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