Control valve, hydraulic system, working machine and hydraulic control method

Abstract

The application provides a control valve, a hydraulic system, a working machine and a hydraulic control method. The control valve comprises a valve body, an internal valve cavity of the valve body, fluid inlet holes and fluid outlet holes arranged in a staggered manner in the circumferential direction of the valve body, a valve core slidingly arranged in the valve cavity, an outer wall surface of the valve core and an inner wall surface of the valve body being in close contact, a fluid passage arranged on the valve core and used for connecting the fluid inlet holes and the fluid outlet holes, and when the valve core moves to one side, one of the fluid inlet holes and the fluid outlet holes and the fluid passage are kept in communication, and the other one is gradually staggered with the fluid passage. When facing different load requirements, the opening state of the fluid inlet holes and the fluid outlet holes is changed by controlling the back-and-forth movement of the valve core, proportional control of the flow of the fluid is formed, and finally the adjustment control of the pressure and the flow of the fluid is realized.

Description

Technical Field

[0001] This application relates to the field of safety valve technology, and more specifically, to a control valve, a hydraulic system, a working machine, and a hydraulic control method. Background Technology

[0002] The unloading valve is one of the key components of the pumping station system. Its main function is to stabilize the pump's working pressure within the specified pressure range.

[0003] In related technologies, cone valves are typically used to implement the loading and unloading functions of a system. However, this approach relies on a single on / off valve operation mode in practical applications, which proves inadequate when dealing with varying load and flow demands. The system cannot dynamically adjust the valve opening degree according to real-time operating conditions, making it difficult to accurately match the pressure control requirements under different load and flow conditions. It lacks flexibility and cannot effectively adapt to the control requirements of different loads and flow rates. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the related art.

[0005] Therefore, the first aspect of this application is to propose a control valve.

[0006] The second aspect of this application is to propose a hydraulic system.

[0007] The third aspect of this application is to propose another type of operating machinery.

[0008] The fourth aspect of this application is to propose a hydraulic control method.

[0009] In view of this, according to the first aspect of this application, a control valve is proposed, comprising: a valve body having a valve cavity inside, and the valve body having a fluid inlet hole and a fluid outlet hole arranged offset from each other along the circumferential direction; a valve core slidably disposed within the valve cavity, with the outer wall surface of the valve core abutting against the inner wall surface of the valve body; the valve core having a fluid channel for communicating with the fluid inlet hole and the fluid outlet hole; when the valve core moves to one side, one of the fluid inlet hole and the fluid outlet hole remains in communication with the fluid channel, while the other gradually becomes offset from the fluid channel.

[0010] In the above technical solution, when the valve core moves to one side, one of the fluid inlet or outlet remains connected to the fluid channel, while the other gradually separates from and closes off from the fluid channel. In this way, when facing different load demands, the opening state of the fluid inlet and outlet orifices is changed by controlling the back-and-forth movement of the valve core, i.e., adjusting the flow area from the fluid inlet to the fluid outlet. The different opening states of the fluid inlet and outlet orifices result in different fluid flow rates, forming proportional control of the fluid flow rate, ultimately achieving adjustment and control of the fluid pressure and flow rate. This improves the control valve's adaptability to multiple loads.

[0011] In some technical solutions, an annular groove is provided on the outer wall surface of the valve core to form a fluid channel; the annular groove is provided with a first throttling edge and a second throttling edge on both sides of the moving direction.

[0012] Specifically, the first and second throttling sides have different shapes and structures. This allows for the creation of two different flow area curves, thus meeting various load requirements and further enhancing the control valve's adaptability to system flow and pressure control needs.

[0013] In the above technical solution, the first throttling edge is designed as an arc shape, and / or the second throttling edge is designed as a wave shape.

[0014] The arc-shaped design facilitates a smoother transition of fluid as it passes through the throttling edge, reducing fluid impact and eddy current formation, thereby lowering energy loss and noise. Simultaneously, due to the relatively simple and continuous geometry of the arc, its corresponding flow area change curve is more predictable, facilitating precise control of flow rate and pressure. The wavy design, on the other hand, provides more flow path variations, allowing the fluid to experience multiple contractions and expansions at different cross-sections, thus enabling more flexible flow rate and pressure regulation. Therefore, in the above technical solution, the first throttling edge is designed as an arc, and the second as a wavy shape. Combining the advantages of both, two distinct flow area curves can be formed. This means that during the control valve's adjustment process, these two throttling modes can be flexibly selected or switched according to actual load requirements by adjusting the valve core position, thereby achieving optimal control of system flow rate and pressure. This design not only improves the flexibility and adaptability of the control valve but also expands its application range, enabling it to meet more diverse needs.

[0015] In the above technical solution, the valve core and the valve body form a first pressure chamber and a second pressure chamber at their two ends in the direction of movement, respectively. The valve body is provided with oil passages that communicate with the first pressure chamber and the second pressure chamber, and pilot valves are provided on the oil passages.

[0016] In this way, the pilot valve controls the oil circuit to inject oil into the first pressure chamber and the second pressure chamber according to the load demand, forming oil pressure. The oil pressure pushes the valve core to move left and right, thereby changing the opening state of the fluid inlet and outlet orifices, and realizing the adjustment and control of the fluid pressure and flow rate.

[0017] In the above technical solution, by designing a pilot control oil circuit, the control oil and the system oil are isolated, thereby preventing the system oil from affecting the displacement of the valve core, which helps to improve the response speed of the control valve.

[0018] In some technical solutions, the pilot valve is a pilot proportional valve or a proportional solenoid valve.

[0019] In some technical solutions, considering the possibility of pilot valve failure, the control valve also includes an emergency device to handle emergencies and ensure safety. The emergency device is connected to the valve core and is used to actuate the valve core. Thus, in an emergency, controlling the emergency device to move the valve core changes the opening state of the fluid inlet and outlet ports, ensuring safety.

[0020] In practical applications, the emergency device includes: a connector, which is slidably disposed in the first pressure chamber or the second pressure chamber, and the connector is connected to the valve core; and a pusher, which is slidably disposed on the valve body, and is used to push the connector to move, thereby driving the valve core to move.

[0021] In the above technical solution, an elastic element is provided between the connector and the valve core. This way, when the oil pressure pushes the valve core to its limit position, further movement will compress the elastic element, thus preventing excessive movement that could damage the control valve and helping to extend the service life of the control valve.

[0022] In some technical solutions, the control valve also includes a displacement feedback device; this device is used to monitor the displacement distance of the valve core in real time. This allows for real-time monitoring of the valve core's displacement distance during adjustments to determine its current position, ensuring the valve core moves accurately to the predetermined position. Simultaneously, the displacement information can be fed back to the control system for precise adjustments, and this also helps improve the control valve's response speed.

[0023] According to a second aspect of this application, a hydraulic system is proposed, comprising a control pressure oil source, a system pressure oil source, and a control valve as described in any of the above-mentioned technical solutions. The control pressure oil source is connected to the valve core to drive its displacement; the system pressure oil source is connected to a fluid inlet port and a fluid outlet port. Thus, this hydraulic system possesses all the beneficial effects of any of the above-mentioned technical solutions, which will not be elaborated further here.

[0024] According to a third aspect of this application, this application proposes a working machine having the control valve or hydraulic system proposed in any of the above-described technical solutions. In this way, the working machine possesses all the beneficial effects of any of the above-described technical solutions, which will not be elaborated further here.

[0025] According to a fourth aspect of this application, a hydraulic control method is proposed for use in the working machinery described in any of the above-mentioned technical solutions. The hydraulic control method specifically includes the following steps:

[0026] By using a pilot valve and a control pressure oil source to control the valve core displacement, the different opening degrees of the fluid inlet and outlet orifices are adjusted, thereby forming a proportional control of the flow rate and pressure of the system pressure oil source.

[0027] Since this hydraulic control method utilizes the control valve provided by any of the above technical solutions, it possesses all the beneficial effects provided by any of the above technical solutions, which will not be elaborated further here.

[0028] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0029] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0030] Figure 1 A schematic diagram of the control valve of this application is shown;

[0031] Figure 2 It shows Figure 1 Enlarged structural diagram at point A;

[0032] Figure 3 A schematic diagram of the hydraulic system of this application is shown.

[0033] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0034] 10-Control valve; 100-Valve body; 110-Valve chamber; 120-Fluid inlet port; 130-Fluid outlet port; 140-First pressure chamber; 150-Second pressure chamber; 160-Oil passage;

[0035] 200-Valve core; 210-Annular groove; 211-First throttling edge; 212-Second throttling edge; 300-Pilot valve; 400-Emergency device; 410-Connector; 420-Pushing element; 430-Elastic element; 500-Displacement feedback device; 600-Fluid passage;

[0036] 21-System pressure oil source; 22-Control pressure oil source. Detailed Implementation

[0037] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0039] The following is combined Figures 1 to 3 The control valve, hydraulic system, working machinery, and hydraulic control method provided in this application will be described in detail through specific embodiments and application scenarios.

[0040] Reference Figure 1 and Figure 2 Some embodiments of this application provide a control valve whose structure includes a valve body 100 and a valve core 200.

[0041] Specifically, a valve cavity 110 is formed inside the valve body 100; the valve body 100 is provided with a fluid inlet hole 120 and a fluid outlet hole 130, which are located circumferentially around the valve body 100 (as shown in the attached figure). Figure 1 As shown in the Y direction, the fluid inlet port 120 and the fluid outlet port 130 are staggered, meaning they are not on the same plane or straight line of the valve body 100, but are distributed at different positions on the valve body 100. Among them, the fluid inlet port 120 constitutes the P port for liquid inlet, and the fluid outlet port 130 constitutes the T port for liquid outlet.

[0042] The valve core 200 is slidably disposed on the valve cavity 110 and aligned with the axis of the valve cavity 110. Furthermore, the outer wall surface of the valve core 200 is in close contact with the inner wall surface of the valve body 100. An annular groove 210 is formed on the outer wall surface of the valve core 200, which connects the fluid inlet port 120 and the fluid outlet port 130 to allow fluid to pass through.

[0043] During operation, when the valve core 200 moves to one side, one of the fluid inlet port 120 and the fluid outlet port 130 remains connected to the annular groove 210, while the other gradually shifts away from the annular groove 210. In this way, when facing different load demands, by controlling the back-and-forth movement of the valve core 200, the opening states of the fluid inlet port 120 and the fluid outlet port 130 are changed, i.e., the flow area from port P to port T is adjusted. The different opening states of the fluid inlet port 120 and the fluid outlet port 130 result in different fluid flow rates, forming proportional control of the fluid flow rate, ultimately achieving adjustment and control of the fluid pressure and flow rate. This improves the control valve's adaptability to multiple loads.

[0044] In the above embodiment, an annular groove 210 is provided on the outer wall surface of the valve core 200 to form a fluid channel 600. However, it is understood that the valve core 200 can also form a fluid channel 600 by providing through holes or other methods, and this embodiment is not limited to this.

[0045] In some embodiments, the annular groove 200 is in the direction of movement (as shown in the attached figure). Figure 2 The first throttling edge 211 and the second throttling edge 212 are respectively provided on both sides of the (in the X direction).

[0046] Specifically, the first throttling edge 211 and the second throttling edge 212 have different shapes and structures. This allows for the formation of two flow area curves, thereby meeting various load requirements and further enhancing the control valve's adaptability to the system's flow and pressure control needs.

[0047] In the above embodiment, the first throttling edge 211 is designed as an arc shape, and the second throttling edge 212 is designed as a wave shape.

[0048] The arc-shaped design facilitates a smoother transition of fluid as it passes through the throttling edge, reducing fluid impact and eddy current formation, thereby lowering energy loss and noise. Simultaneously, due to the relatively simple and continuous geometry of the arc, its corresponding flow area change curve is more predictable, facilitating precise control of flow rate and pressure. The wavy design, on the other hand, provides more flow path variations, allowing the fluid to experience contraction and expansion at multiple different cross-sections as it passes through, thus achieving more flexible flow rate and pressure regulation. Therefore, in the above embodiment, the first throttling edge 211 is designed as an arc, and the second throttling edge 212 is designed as a wavy shape. Combining the advantages of both, two distinct flow area curves can be formed. This means that during the adjustment of the control valve, these two throttling modes can be flexibly selected or switched according to the actual load requirements by adjusting the position of the valve core 200, thereby achieving optimal control of the system flow rate and pressure. This design not only improves the flexibility and adaptability of the control valve but also expands its application range, enabling it to meet more diverse needs.

[0049] In the above embodiment, the valve core 200 and the valve body 100 form a first pressure chamber 140 and a second pressure chamber 150 at their two ends in the moving direction, respectively. The valve body 100 is provided with an oil passage 160 that communicates with the first pressure chamber 140 and the second pressure chamber 150, respectively, and a pilot valve 300 is provided on the oil passage 160.

[0050] In this way, the pilot valve 300 controls the oil circuit 160 to inject oil into the first pressure chamber 140 and the second pressure chamber 150 respectively according to the load demand, forming oil pressure. The oil pressure pushes the valve core 200 to move left and right, thereby changing the opening state of the fluid inlet orifice 120 and the fluid outlet orifice 130, realizing the adjustment and control of the fluid pressure and flow rate. In this embodiment, by designing the pilot control oil circuit, the control oil and the system oil are isolated, thereby avoiding the system oil from affecting the displacement of the valve core 200, which helps to improve the response speed of the control valve.

[0051] In practical applications, the pilot valve 300 is selected as either a pilot proportional valve or a proportional solenoid valve.

[0052] Considering the possibility of pilot valve 300 failure, to cope with emergencies and ensure safety, in some embodiments, the control valve also includes an emergency device 400. The emergency device 400 is connected to the valve core 200 and is used to move the valve core 200. In this way, in the event of an emergency, the emergency device 400 can be controlled to move the valve core 200, thereby changing the opening state of the fluid inlet port 120 and the fluid outlet port 130 to ensure safety.

[0053] In the above embodiment, the emergency device 400 includes a connector 410 and a pusher 420. The connector 410 is slidably disposed within the first pressure chamber 140 and connected to the valve core 200. The pusher 420 slidably passes through the valve body 100. In an emergency, the pusher 420 is moved to contact the connector 410, thereby moving the valve core 200 and changing the opening state of the fluid inlet port 120 and the fluid outlet port 130 to ensure safety.

[0054] It is understandable that the emergency device 400 can also be installed in the second pressure chamber 150.

[0055] In practical applications, an elastic element 430 is provided between the connector 410 and the valve core 200. This way, when the oil pressure pushes the valve core 200 to its limit position, further movement will compress the elastic element 430, thus preventing excessive movement that could damage the control valve and helping to extend its service life. For example, the elastic element 430 is a spring and is sleeved on the connector 410.

[0056] To ensure the valve core 200 accurately returns to and moves to the desired position, some embodiments also include a displacement feedback device 500. The displacement feedback device 500 monitors the displacement distance of the valve core 200 to determine its position. Thus, during adjustments, the displacement feedback device 500 monitors the displacement distance of the valve core 200 in real time to determine its current position, ensuring that the valve core 200 moves accurately to the predetermined position. Simultaneously, the displacement information can be fed back to the control system for precise adjustments, and this also helps improve the response speed of the control valve.

[0057] Reference Figure 3 In some embodiments, this application also provides a hydraulic system, including a system pressure oil source 21, a control pressure oil source 22, and a control valve 10 provided in any of the above embodiments. The control pressure oil source 22 is connected to the valve core 200 to drive the valve core 200 to move; the system pressure oil source 21 is connected to the fluid inlet port 120 and the fluid outlet port 130. Therefore, this hydraulic system has all the beneficial effects of any of the above embodiments, which will not be elaborated further here.

[0058] In some embodiments, this application also provides a working machine including the control valve or hydraulic system provided in any of the above embodiments. Thus, the working machine possesses all the beneficial effects of any of the above embodiments, which will not be elaborated further here.

[0059] In some embodiments, this application also provides a hydraulic control method for use in the hydraulic system or working machinery provided in any of the above embodiments. The specific steps of this hydraulic control method are as follows:

[0060] The pilot valve 300 and the control pressure oil source 22 are used to control the displacement of the valve core 200, thereby adjusting the different opening degrees of the fluid inlet port 120 and the fluid outlet port 130, forming a proportional control of the flow rate and pressure of the system pressure oil source 21.

[0061] Specifically, according to the load requirements, the pilot valve 300 controls the oil circuit 160 to inject oil into the first pressure chamber 140 or the second pressure chamber 150, forming oil pressure. The oil pressure pushes the valve core 200 to move, changing the opening state of the fluid inlet port 120 and the fluid outlet port 130, thereby changing the flow area from the fluid inlet port 120 to the fluid outlet port 130. At this time, the displacement feedback device 500 monitors the displacement distance of the valve core 200 in real time to determine the current position of the valve core 200, thereby ensuring that the valve core 200 moves accurately to the predetermined position. At the same time, the displacement information is fed back to the hydraulic system or the control system of the operating machinery.

[0062] Since this hydraulic control method utilizes the control valve provided in any of the above embodiments, it possesses all the beneficial effects provided in any of the above embodiments, which will not be elaborated further here.

[0063] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.

[0064] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control valve, characterized in that, include: The valve body has a valve cavity inside, and the valve body is provided with staggered fluid inlet holes and fluid outlet holes along the circumferential direction; The valve core is slidably disposed within the valve cavity, and the outer wall surface of the valve core is in contact with the inner wall surface of the valve body; The valve core is provided with a fluid channel; the fluid channel is used to connect the fluid inlet port and the fluid outlet port; When the valve core moves to one side, one of the fluid inlet orifice and the fluid outlet orifice remains in communication with the fluid channel, while the other gradually moves away from the fluid channel. The valve core forms a first pressure chamber and a second pressure chamber with the valve body at both ends in the direction of movement. The valve body is provided with oil passages that are respectively connected to the first pressure chamber and the second pressure chamber; The oil circuit is equipped with a pilot valve, which controls the oil circuit to inject oil into the first pressure chamber and the second pressure chamber respectively according to the load demand, forming oil pressure, and the oil pressure pushes the valve core to move left and right. The control valve further includes a displacement feedback device; the displacement feedback device is used to monitor the displacement distance of the valve core in real time. The outer wall of the valve core is provided with an annular groove to form the fluid channel; the annular groove is provided with a first throttling edge and a second throttling edge on both sides of the moving direction. The first throttling edge is designed to be arc-shaped, and the second throttling edge is designed to be wavy.

2. The control valve according to claim 1, characterized in that, It also includes an emergency device; the emergency device is connected to the valve core and is used to move the valve core.

3. The control valve according to claim 2, characterized in that, The emergency device includes: A connector is slidably disposed within the first pressure chamber or the second pressure chamber; the connector is connected to the valve core. A pusher element is slidably disposed on the valve body and is used to push the connecting element to move; An elastic element is disposed between the connector and the valve core.

4. A hydraulic system, characterized in that, Includes a control pressure oil source, a system pressure oil source, and a control valve as described in any one of claims 1 to 3; The control pressure oil source is connected to the valve core to drive the valve core displacement; The system pressure oil source is connected to the fluid inlet port and the fluid outlet port.

5. A type of operating machinery, characterized in that, include: The control valve as described in any one of claims 1 to 3, or the hydraulic system as described in claim 4.

6. A hydraulic control method, characterized in that, The hydraulic control method is used in the operating machinery as described in claim 5; the hydraulic control method includes the following steps: By using a pilot valve and a control pressure oil source to control the valve core displacement, the different opening degrees of the fluid inlet and outlet orifices are adjusted, thereby forming a proportional control of the flow rate and pressure of the system pressure oil source.

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