A control valve and a control system including the same

Abstract

The present application discloses a control valve, which includes a valve body. The valve body is provided with a flow medium cavity and a return medium cavity. The valve body is provided with a flow medium inlet passage and a flow medium outlet passage that communicate with the flow medium cavity, and the valve body is provided with a return medium inlet passage and a return medium outlet passage that communicate with the return medium cavity; the control valve further includes a flow on-off control switch and a return on-off control switch. The flow on-off control switch controls the flow medium outlet passage, and the return on-off control switch controls the return medium inlet passage; when the flow on-off control switch turns on the flow medium outlet passage, the return on-off control switch turns on the return medium inlet passage, the flow medium cavity provides a fluid medium for the actuator, and the return medium cavity receives the returned fluid medium. The present application also discloses a control system applying the control valve. The control valve of the present application can replace the traditional multi-way valve and provides a technical basis for the digital and intelligent control of the hydraulic control system.

Description

Technical Field

[0001] This application belongs to the technical field of fluid transmission, especially the technical field of hydraulic transmission, and particularly relates to a control valve and a control system including the same. Background Art

[0002] Fluid transmission technology is widely applied in various industries. It is particularly more commonly used in the field of construction machinery. Construction machinery (such as loaders, excavators, cranes, concrete pump trucks, etc. with hydraulic systems) has advantages such as high work efficiency and strong operation ability, and thus is widely used. It can be said that the emergence of construction machinery makes the operations such as building high-rise buildings, building high-speed railways, and installing certain special equipment simpler, more efficient, more labor-saving, and cost-saving, and can even complete tasks that were impossible to complete before. In the process of modern construction, construction machinery plays a crucial role. Although existing construction machinery can already meet the requirements of the vast majority of projects, the vast majority of existing construction machinery requires on-site operation by operators to carry out relevant operations. In some special working conditions and high-risk application scenarios, it even poses a great threat to the lives of operators. Even for individual hydraulic systems that can be remotely manually operated through sensing technology, due to the non-linear relationship between flow and pressure at the throttle orifice, it is difficult to establish a linear correspondence between flow or pressure and modern electronic control pulse signals, and thus it is difficult to achieve intelligent control through the control program of the chip. At most, it can achieve remote analog operation by specific personnel. Taking an excavator as an example, a hydraulic excavator is an indispensable mechanical equipment in various earthwork constructions, and is particularly widely used in special working condition operations such as earthquake relief, toxic environments, dangerous tunnels, fire fighting and rescue, cliff road opening, and explosion site cleaning, posing great danger to operators. If the intelligent control operation of construction machinery can be achieved, while liberating the labor force, the operation safety of construction machinery is improved, and it will also greatly enhance the working ability of construction machinery and reduce costs such as use and maintenance. However, to achieve the intelligent control of equipment with a hydraulic control system, it is necessary to first achieve the discretization and digitalization of the hydraulic system. Restricted by the structural and functional defects of its components and the combined defects between components, the various functions of the existing hydraulic control system are coupled and restricted with each other, making it difficult to achieve the discretization and digitalization of the hydraulic medium. With the existing technical strength, achieving the intelligent control of the hydraulic control system is only an algorithm of continuous adjustment and fitting, and it is not easy to achieve quantitative control. Therefore, it is necessary to re-conceive and re-design the various components included in the existing hydraulic control system and the combinations between components.

[0003] In any existing hydraulic control system, the hydraulic control system needs to have multiple functions (for example, the existing excavator needs to control the hydraulic actuators through the hydraulic control system to achieve the functions of amplitude change, hydraulic control travel, and hydraulic control rotation between the arms). For this purpose, a multi-way valve must be set up. However, in order to save installation space and facilitate operation, the multi-way valve is often formed by superimposing single-piece valves, and shares an oil supply circuit and an oil return circuit. Regardless of whether it is connected in series or in parallel, the oil supply pressure and flow between the single-piece valves are coupled and interfere with each other, so it is difficult to achieve digitization and discretization, and it is even more impossible to implement precise control and intelligent control.

[0004] The existing multi-way valve has relatively simple requirements for each actuator. In order to facilitate processing and improve processing accuracy, the multi-way valve is composed of multiple single-piece valves stacked according to the needs of functions and working conditions and connected by bolts. Although the processing accuracy of the single valve piece can be well guaranteed, due to the existence of factors such as processing accuracy and installation deformation, the existing multi-way valve will inevitably cause problems such as leakage between pieces and valve core sticking, which seriously affects the reliability, stability and safety of the hydraulic control system including the multi-way valve.

[0005] The existing multi-way valve often has a valve core that jointly controls the opening and closing of the oil supply circuit, the oil inlet of the actuator, the oil return circuit and the oil outlet of the actuator. The switching states of different oil circuits are coupled together to simultaneously change the direction of fluid flow or adjust the flow of the actuator by the size of the throttle opening. The actuators are bound to affect each other, seriously affecting the performance of the existing fluid system including the multi-way valve; this is also the crux of the existing hydraulic control system that cannot achieve discrete, digital, and intelligent control.

[0006] In addition to the above-mentioned defects, the existing multi-way valves, including the equipment of the hydraulic control system, often have the problem of large vibration during use. Therefore, the inter-plate leakage problem of the multi-way valve formed by the superposition of multiple single-piece valves is generally overcome by thickening the connecting bolts and increasing the connecting locking torque. However, with the passage of time and the influence of factors such as fatigue stretching of the bolts, the problem of inter-plate leakage will still occur after a period of use; it is worth noting that due to the increase in the connecting locking torque of the bolts, the sealing form through the compression deformation between the plates will also cause the valve body of the multi-way valve to deform due to the parallelism, flatness, material creep, etc. of the valve body connection surface, thereby affecting the precise movement of the valve core, and even easily causing the valve core inside the multi-way valve to be stuck; and as the length of the connecting bolts increases, it will cause uneven force and fatigue creep. Therefore, the thickness of each plate of the existing multi-way valve is reduced as much as possible, which will make the flow channel of the multi-way valve narrow and curved, and the pressure loss will increase sharply, thereby causing many unavoidable technical bottlenecks in the existing multi-way valve.

[0007] In order to solve the discretization, digitization and intelligent control of the existing hydraulic control system, it is necessary to combine the new discrete and digital control system to innovatively conceive and design the existing reversing valve to overcome the existing reversing valve's large reversing dead zone, many control coupling factors, and lack of flexibility to adapt to the requirements of the variable working conditions of the actuator. To this end, the applicant proposes a control valve that can solve at least the above technical problems existing in the existing multi-way valve and a control system using the control valve.

[0008] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention

[0009] The present invention provides a control valve and a control system thereof to solve at least one of the above technical problems.

[0010] The technical solution adopted by the present invention is:

[0011] A control valve comprises a valve body, wherein a supply medium chamber and a reflux medium chamber are provided inside the valve body, a supply medium inlet channel and a supply medium outlet channel connected to the supply medium chamber are provided on the valve body, and a reflux medium inlet channel and a reflux medium outlet channel connected to the reflux medium chamber are provided on the valve body; the control valve further comprises a supply flow cut-off control switch and a reflux flow cut-off control switch, the supply flow cut-off control switch controls the opening and closing of the supply flow medium outlet channel, and the reflux flow cut-off control switch controls the opening and closing of the reflux medium inlet channel; when the supply flow cut-off control switch connects the supply flow medium outlet channel, the reflux flow cut-off control switch connects or closes the reflux medium inlet channel, the supply flow chamber provides fluid medium to the actuator, and the reflux medium chamber receives the refluxed fluid medium; the supply flow cut-off control switch and the reflux flow cut-off control switch are driven by a driving unit.

[0012] A control valve includes a valve body. Inside the valve body, there are two or more fluid supply chambers and at least one fluid return chamber. Each fluid supply chamber is adaptively connected to one or more of the fluid return chambers and is a part of the same flow path; each fluid supply chamber is respectively connected to a fluid supply inlet passage provided on the valve body and at least one fluid supply outlet passage provided on the valve body, and a fluid flow on-off control switch is provided on each fluid supply outlet passage; each fluid return chamber is respectively connected to at least one fluid return inlet passage provided on the valve body and a fluid return outlet passage provided on the valve body, and a fluid return on-off control switch is provided on each fluid return inlet passage; when the fluid flow on-off control switch is in the open state, the fluid return on-off control switch in the same flow path is also in the open state. The fluid supply chamber supplies fluid medium to the actuator, and the fluid return chamber receives the returned fluid medium; the fluid flow on-off control switch and the fluid return on-off control switch are driven by a drive unit.

[0013] Further optionally, the valve body is provided with two fluid supply chambers and two fluid return chambers. Among them, one fluid supply chamber is adapted to one fluid return chamber and is a part of the same flow path, and the other fluid supply chamber is adapted to the other fluid return chamber and is a part of the same flow path; each fluid supply chamber is connected to at least one fluid supply outlet passage, and each fluid return chamber is connected to at least one fluid return inlet passage.

[0014] Further optionally, when the control valve is working, the fluid flow on-off control switch makes the fluid supply outlet passage continuously alternate between the on and off states, so that the control valve supplies pulsed fluid medium to the outside; or,

[0015] When the control valve is working, optionally, the fluid flow on-off control switch makes the fluid supply outlet passage continuously alternate between the on and off states, so that the control valve supplies pulsed fluid medium to the outside. At the same time, the fluid return on-off control switch in the same flow path as the fluid flow on-off control switch makes the fluid return inlet passage continuously alternate between the on and off states or remain continuously on, so that the fluid return chamber receives the returned fluid medium.

[0016] Further selectively, the drive unit is selected to be a drive motor, and the supply flow on-off control switch is set as a first rotating body having a first channel. During operation, the first rotating body is driven by the drive motor and rotates at a set speed. When the first rotating body rotates within a set angle range, the first channel makes the supply medium discharge channel it controls in an on state; the return flow on-off control switch is set as a second rotating body having a second channel. During operation, the second rotating body is driven by the drive motor and rotates at a set speed. When the second rotating body rotates to a set angle range, the second channel makes the return medium inlet channel it controls in an on state.

[0017] Further selectively, the first rotating body of the supply flow on-off control switch and the second rotating body of the return flow on-off control switch in the same flow path are coaxially arranged and driven by the same drive motor; or, the first rotating body of the supply flow on-off control switch and the second rotating body of the return flow on-off control switch in the same flow path are selectively non-linked and driven by different drive motors respectively.

[0018] Further selectively, the drive motor is selected to be a servo motor or a stepper motor. The control valve further includes an electronic control unit, and the drive motor is electrically connected to the electronic control unit to control the frequency of the supply flow on-off control switch to turn on the supply medium discharge channel; or, the drive motor is selectively a servo motor or a stepper motor. The control valve further includes an electronic control unit, and the drive motor is electrically connected to the electronic control unit to control the frequency of the supply flow on-off control switch to turn on the supply medium discharge channel and control the frequency of the return flow on-off control switch to turn on the return medium inlet channel.

[0019] Further selectively, the control valve further includes an energy storage unit. The energy storage unit is connected to the supply medium cavity to make the supply medium cavity in a set pressure range. The supply medium cavity and the return medium cavity in the same flow path are connected through a one-way control switch with a set opening pressure. When the pressure in the supply medium cavity is greater than the set opening pressure, the supply medium cavity and the return medium cavity are in an on state; or, the control valve is selectively provided with an energy storage unit. The energy storage unit is connected to the supply medium cavity to make the supply medium cavity in a set pressure range. The supply medium cavity and the return medium cavity are connected through an electromagnetic proportional overflow valve with an adjustable opening pressure. When the pressure in the supply medium cavity is greater than the set opening pressure, the supply medium cavity and the return medium cavity are in an on state.

[0020] Further selectively select to set the supply medium cavity as an ellipsoidal cavity or a spherical cavity; and / or, selectively set the return medium cavity as an ellipsoidal cavity or a spherical cavity.

[0021] The present application also discloses a control system applying the control valve described in any of the foregoing solutions. The control system includes an actuator, and one or more actuators each include a first medium inlet / outlet end and a second medium inlet / outlet end; one of the supply medium cavities is connected to the first medium inlet / outlet end of at least one actuator so that the supply medium cavity provides the required fluid medium for at least one actuator; the second medium inlet / outlet end of each actuator is connected to at least one return medium cavity so that the return medium cavity receives the returned fluid medium.

[0022] In the present application, those skilled in the art have the motivation to set necessary components, units or systems at necessary places according to the well-known technologies in related fields.

[0023] In the present application, the so-called control system refers to a system that uses a fluid medium as the working medium and can implement control, such as a hydraulic control system, a pneumatic control system, etc.

[0024] In the present application, the fluid medium is not specifically limited, and it can be a liquid medium or a gas medium. In specific implementation, preferably, the liquid medium is set as hydraulic oil.

[0025] The control valve and the control system proposed by the present application can bring the following beneficial effects:

[0026] The control valve described in the present application can replace the multi-way valve of the existing control system and can overcome many defects of the traditional multi-way valve; in addition, the control valve described in the present application can discretize and metrologically divide the fluid medium, and can realize the digitalization and intelligentization of the control system, thereby providing technical guarantee and technical basis for the intelligent control of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0028] Figure 1 is a schematic structural diagram of a control valve provided by an embodiment of the present application;

[0029] Figure 2 is a schematic structural diagram of another control valve provided by an embodiment of the present application.

[0030] Among them,

[0031] 1 valve body, 11 supply medium cavity, 12 return medium cavity, 13 supply medium inlet channel, 14 supply medium discharge channel, 15 return medium inlet channel, 16 return medium discharge channel, 17 supply on-off control switch, 171 first rotating body, 18 return on-off control switch, 181 second rotating body

[0032] 2 drive motor

[0033] 3 energy storage unit Specific embodiments

[0034] In order to more clearly illustrate the overall concept of the present application, the following will be described in detail by way of examples in conjunction with the accompanying drawings of the specification

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined

[0037] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances

[0038] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to terms such as "one solution", "some solutions", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the solution or example are included in at least one solution or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same solution or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more solutions or examples.

[0039] For ease of description, in the following, "front", "rear", "left", "right", "upper", and "lower" are the orientations relative to the user when the control valve is in use.

[0040] It should be noted that the fluid supply medium cavity in this application is set to be any cavity that can accommodate the fluid medium provided to the actuator, and its specific shape is not specifically limited. Preferably, the fluid supply medium cavity is set to be spherical or ellipsoidal; the fluid return medium cavity is set to be any cavity that can receive the returned fluid medium, and its specific shape is not specifically limited. Preferably, the fluid supply medium cavity is set to be spherical or ellipsoidal.

[0041] In this application, the so-called "fluid supply medium cavity and fluid return medium cavity that are components of the same flow path" means that the fluid supply medium cavity and the fluid return medium cavity both belong to the components of the same fluid circuit, that is, the fluid supply medium cavity and the fluid return medium cavity are at least connected to the same actuator and are components of the same fluid circuit.

[0042] In this application, above a certain value includes this number. For example, two or more includes two.

[0043] Such as Figure 1A control valve shown includes a valve body 1. Inside the valve body 1, there are a flow medium cavity 11 and a return medium cavity 12. On the valve body 1, there are a flow medium inlet passage 13 and a flow medium outlet passage 14 that communicate with the flow medium cavity 11, and a return medium inlet passage 15 and a return medium outlet passage 16 that communicate with the return medium cavity 12. The control valve further includes a flow on-off control switch 17 and a return on-off control switch 18. The flow on-off control switch 17 controls the opening and closing of the flow medium outlet passage 14, and the return on-off control switch 18 controls the opening and closing of the return medium inlet passage 15. When the flow on-off control switch 17 turns on the flow medium outlet passage 14, the return on-off control switch 18 turns on or off the return medium inlet passage 15. The flow medium cavity 11 provides a fluid medium to the actuator, and the return medium cavity 12 receives the returned fluid medium. The flow on-off control switch 17 and the return on-off control switch 18 are driven by a driving unit. When the control valve is specifically applied to a control system, it can selectively connect the working fluid source to the flow medium cavity 11 through the pumping unit and the flow medium inlet passage 13. The flow medium cavity 11 is connected to one fluid medium inlet and outlet end of the actuator through the flow medium outlet passage 14 and a reversing valve. The other fluid medium inlet and outlet end of the actuator is connected to the return medium cavity 12 through the reversing valve and the return medium inlet passage 15. The return medium cavity 12 is directly or indirectly connected to the working fluid source through the return medium outlet passage 16. It should be noted that when the flow on-off control switch 17 turns on the flow medium outlet passage 14, under normal working conditions, the return medium cavity 12 receives the returned fluid medium, and under some special working conditions, the return on-off control switch 18 in the same flow path is in the off state. As a transformable implementation manner, the flow medium cavity 11 of the present application can be selectively connected to one or more actuators (which can be selectively set as pneumatic actuators or hydraulic actuators, specifically such as fluid motors, cylinders, or hydraulic cylinders, etc.). The specific number can be selected according to the number of actuators set in the control system where the control valve is located. For example, the control valve can be connected to one, two, three, four, five, six, or more than seven actuators. As a transformable implementation manner, the control valve can selectively have two or more flow medium cavities 11 and one or more return medium cavities 12 on the valve body 1. Additionally, in specific implementation, a control valve including one flow medium cavity 11 and one return medium cavity 12 can be selectively used as a control valve unit. Specifically, two or more such control valve units can be combined together as a multi-way valve of a control system according to actual needs. And it can further be selectively set that the control system is a hydraulic control system or a pneumatic control system. Preferably, the control system is set as a control system using hydraulic oil as the fluid medium.In the control valve described in the present application, control switches are respectively arranged on the supply medium discharge channel 14 and the return medium inlet channel 15, and can independently control the opening and closing of their respective controlled channels, so that the control valve can provide fluid media according to the demand of the actuator; at the same time, multiple actuators of the control system including the control valve can be made independent of each other, avoiding the problems of mutual coupling, mutual limitation, and mutual influence existing between the actuators of the traditional control system.

[0044] In the specific implementation of the present application, it is also selectively possible that there are two or more supply medium chambers 11 and at least one return medium chamber 12 inside the valve body 1. Each supply medium chamber 11 is adaptively connected to one return medium chamber 12 and is used as a part of the same flow path; each supply medium chamber 11 is respectively connected to the supply medium inlet channel 13 (connected to the pumping unit) arranged on the valve body 1 and at least one supply medium discharge channel 14 arranged on the valve body 1, and a supply flow on-off control switch 17 is arranged on each supply medium discharge channel 14; each return medium chamber 12 is respectively connected to at least one return medium inlet channel 15 arranged on the valve body 1 and the return medium discharge channel 16 arranged on the valve body 1, and a return flow on-off control switch 18 is arranged on each return medium inlet channel 15; when the supply flow on-off control switch 17 is in the open state, the return flow on-off control switch 18 in the same flow path as it is also in the open state, the supply medium chamber 11 provides fluid media for the actuator, and the return medium chamber 12 receives the returned fluid media; the supply flow on-off control switch 17 and the return flow on-off control switch 18 are driven by the driving unit. In the specific implementation, the number of the supply medium chambers 11 and the number of the return medium chambers 12 can be selectively arranged on the valve body 1 according to actual needs, and it is further selectively possible that one return medium chamber 12 is adapted to one or more supply medium chambers 11, that is, one return medium chamber 12 can be selectively used as a part of the same flow path with one supply medium chamber 11 or one return medium chamber 12 can be selectively adapted to multiple supply medium chambers 11.

[0045] In the specific implementation of the foregoing embodiments and their transformable embodiments of the present application, it is also selectively possible that the supply flow on-off control switch 17 for controlling the opening and closing of the supply medium discharge channel 14 and the return flow on-off control switch 18 for controlling the opening and closing of the return medium inlet channel 15 are respectively driven by independent driving units, or selectively possible that the supply flow on-off control switch 17 for controlling the opening and closing of the supply medium discharge channel 14 and the return flow on-off control switch 18 for controlling the opening and closing of the return medium inlet channel 15 on the same flow path composition are driven by the same driving unit.

[0046] As a preferred embodiment of the present application, as Figure 2 shown, further selectively, two of the fluid supply chambers 11 and two of the fluid return chambers 12 are provided on the valve body 1. Among them, one fluid supply chamber 11 is adapted to one fluid return chamber 12 and serves as a part of the same flow path, and the other fluid supply chamber 11 is adapted to the other fluid return chamber 12 and serves as a part of the same flow path; each fluid supply chamber 11 communicates with a fluid supply discharge channel 14, and each fluid return chamber 12 communicates with a fluid return inlet channel 15; as a transformable embodiment, the present application can also selectively make each fluid supply chamber 11 communicate with more than two fluid supply discharge channels 14, that is, the fluid supply chamber 11 can supply fluid medium to more than two actuators; each fluid return chamber 12 communicates with more than one fluid return inlet channel 15.

[0047] In all the foregoing embodiments of the present application and their transformable embodiments, when implemented specifically, further selectively, during operation, the fluid supply on-off control switch 17 causes the fluid supply discharge channel 14 to be continuously in an alternating working state of being turned on and off, so that the control valve supplies pulsed fluid medium to the outside.

[0048] As a transformable embodiment, also selectively, during operation, the fluid supply on-off control switch 17 causes the fluid supply discharge channel 14 to be continuously in an alternating working state of being turned on and off, so that the control valve supplies pulsed fluid medium to the outside. At the same time, the fluid return on-off control switch 18 in the same flow path as the fluid supply on-off control switch 17 causes the fluid return inlet channel 15 to be continuously in an alternating working state of being turned on and off or in a continuously turned-on state, so that the fluid return chamber 12 receives the returned fluid medium. By causing the fluid supply on-off control switch 17 to be frequently in an open or off state under the drive of the drive unit, the control valve can supply pulsed fluid medium to the actuator, and implement metered and divisible supply of the fluid medium. In this way, discretization and digitization of the fluid medium supply can be achieved, and combined with the electronic control technology, it can provide technical support for the intelligence of the fluid control system applying the control valve.

[0049] As a preferred embodiment of the present application, all of the foregoing embodiments of the present application and their transformable embodiments can further selectively set the driving unit as the driving motor 2, and the supply flow on-off control switch 17 can be set as the first rotating body 171 having a first channel. During operation, the first rotating body 171 is driven by the driving motor 2 and rotates at a set speed. When the first rotating body 171 rotates within a set angle range, the first channel makes the supply flow medium discharge channel 14 controlled thereby in an on state; in specific implementation, the first rotating body 171 can be further selectively set as a rotating shaft, and the first channel can be set as a through hole penetrating the rotating shaft. And the return flow on-off control switch 18 can be further selectively set as the second rotating body 181 having a second channel. During operation, the second rotating body 181 is driven by the driving motor 2 and rotates at a set speed. When the second rotating body 181 rotates to a set angle range, the second channel makes the return flow medium inlet channel 15 controlled thereby in an on state. In specific implementation, the second rotating body 181 can be further selectively set as a rotating shaft, and the second channel can also be set as a through hole penetrating the rotating shaft. As a transformable embodiment, the first rotating body 171 of the supply flow on-off control switch 17 and the second rotating body 181 of the return flow on-off control switch 18 in the same flow path can be further selectively coaxially arranged and driven by the same driving motor 2; or, the first rotating body 171 of the supply flow on-off control switch 17 and the second rotating body 181 of the return flow on-off control switch 18 in the same flow path can be selectively non-associated and driven by different driving motors 2 (not shown in the figure).

[0050] As a preferred embodiment of the present application, in all of the foregoing embodiments containing the drive motor 2, the drive motor 2 can be further selectively set as a servo motor or a stepper motor. The control valve further includes an electronic control unit, and the drive motor 2 is electrically connected to the electronic control unit to control the frequency at which the supply on-off control switch 17 connects to the supply medium discharge channel 14. As a variant embodiment, in all of the foregoing embodiments containing the drive motor 2, the drive motor 2 can be further selectively set as a servo motor or a stepper motor. The control valve further includes an electronic control unit, and the drive motor 2 is electrically connected to the electronic control unit to control the frequency at which the supply on-off control switch 17 connects to the supply medium discharge channel 14, and to control the frequency at which the return on-off control switch 18 connects to the return medium inlet channel 15. In specific implementation, since the rotational speed and rotation angle of the drive motor 2 can be precisely controlled, the amount of the fluid medium supplied by the supply medium cavity 11 can be indirectly and precisely measured. Combining it with the control unit can achieve precise supply of the fluid medium to the actuator. By discretizing and digitizing the supply of the fluid medium, the intelligence of the control can be further realized.

[0051] As a preferred embodiment of the present application, in all of the foregoing embodiments of the present application and their variant embodiments, the control valve can be further selectively made to further include an energy storage unit 3. The energy storage unit 3 is connected to the supply medium cavity 11 to keep the supply medium cavity 11 within a set pressure range. The supply medium cavity 11 and the return medium cavity 12 in the same flow path are connected through a one-way control switch with a set opening pressure. When the pressure in the supply medium cavity 11 is greater than the set opening pressure, the supply medium cavity 11 and the return medium cavity 12 are in a connected state.

[0052] As a variant embodiment, in all of the foregoing embodiments of the present application and their variant embodiments, the control valve can be further selectively made to further include an energy storage unit 3. The energy storage unit 3 is connected to the supply medium cavity 11 to keep the supply medium cavity 11 within a set pressure range. The supply medium cavity 11 and the return medium cavity 12 are connected through an electromagnetic proportional overflow valve with an adjustable opening pressure. When the pressure in the supply medium cavity 11 is greater than the set opening pressure, the supply medium cavity 11 and the return medium cavity 12 are in a connected state. By providing the energy storage unit 3 in the present application, the supply medium cavity 11 can be kept within a set pressure range, thereby making the fluid circuit more stable during operation. Additionally, the same technical effect can be achieved by providing the one-way control switch in the present application. In specific implementation, the one-way control switch can be selectively set as a one-way valve.

[0053] As a preferred embodiment of the present application, all the foregoing embodiments of the present application and their transformable embodiments can further selectively select to set the supply medium cavity 11 as an ellipsoidal cavity or a spherical cavity; and / or, selectively set the return medium cavity 12 as an ellipsoidal cavity or a spherical cavity. By setting the supply medium cavity 11 and / or the return medium cavity 12 as an ellipsoidal cavity or a spherical cavity, the mechanical properties of the valve body 1 are improved, so that the control valve can meet the requirements of high-pressure working conditions.

[0054] The present application also discloses a control system applying the foregoing control valve. The control system includes an actuator, and each of one or more actuators includes a first medium inlet / outlet end and a second medium inlet / outlet end; one supply medium cavity 11 is connected to the first medium inlet / outlet end of at least one actuator to supply the required fluid medium to at least one actuator; the second medium inlet / outlet end of each actuator is connected to at least one return medium cavity 12 to receive the returned fluid medium. In specific implementation, it can be further selectively set that the supply medium cavity 11 is connected to the first medium inlet / outlet end of an actuator through a supply medium discharge channel 14 and a reversing valve, and the second medium inlet / outlet end of the actuator is connected to the return medium cavity 12 through the reversing valve and a return medium inlet channel 15.

[0055] When each supply medium cavity 11 is associated with multiple actuators, the supply medium cavity 11 is provided with supply medium discharge channels 14 having the same number as the actuators, and a supply on-off control switch 17 driven by a driving unit is arranged on each supply medium discharge channel 14. Each supply medium discharge channel 14 is connected to the first medium inlet / outlet end of an actuator through a reversing valve, and the second medium inlet / outlet end of each actuator is connected to a return medium cavity 12 through a reversing valve; in specific operation, one supply medium cavity 11 can supply fluid medium to multiple actuators.

[0056] The drawings of the present application are only for illustration, and any technical solution that meets the written description of the present application belongs to the protection scope of the present application.

[0057] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment.

[0058] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A control valve, characterized in that, it includes a valve body, inside which there are a supply medium cavity and a return medium cavity. On the valve body, there are a supply medium inlet passage and a supply medium outlet passage communicating with the supply medium cavity, and a return medium inlet passage and a return medium outlet passage communicating with the return medium cavity; the control valve further includes a supply on-off control switch and a return on-off control switch. The supply on-off control switch controls the opening and closing of the supply medium outlet passage, and the return on-off control switch controls the opening and closing of the return medium inlet passage; when the supply on-off control switch turns on the supply medium outlet passage, the return on-off control switch turns on or off the return medium inlet passage. The supply medium cavity provides a fluid medium to the actuator, and the return medium cavity receives the returned fluid medium; the supply on-off control switch and the return on-off control switch are driven by a driving unit.

2. A control valve, characterized in that, it includes a valve body, inside which there are more than two supply medium cavities and at least one return medium cavity. Each supply medium cavity is adaptively connected to more than one return medium cavity and is a part of the same flow path; each supply medium cavity is respectively connected to a supply medium inlet passage provided on the valve body and at least one supply medium outlet passage provided on the valve body, and a supply on-off control switch is provided on each supply medium outlet passage; each return medium cavity is respectively connected to at least one return medium inlet passage provided on the valve body and a return medium outlet passage provided on the valve body, and a return on-off control switch is provided on each return medium inlet passage; when the supply on-off control switch is in the open state, the return on-off control switch in the same flow path is also in the open state. The supply medium cavity provides a fluid medium to the actuator, and the return medium cavity receives the returned fluid medium; the supply on-off control switch and the return on-off control switch are driven by a driving unit.

3. The control valve according to claim 2, characterized in that, there are two supply medium cavities and two return medium cavities on the valve body. Among them, one supply medium cavity is adapted to one return medium cavity and is a part of the same flow path, and the other supply medium cavity is adapted to the other return medium cavity and is a part of the same flow path; each supply medium cavity is connected to at least one supply medium outlet passage, and each return medium cavity is connected to at least one return medium inlet passage.

4. The control valve according to any one of claims 1 to 3, characterized in that, during operation, the supply on-off control switch makes the supply medium outlet passage continuously alternate between the on and off states, so that the control valve supplies a pulsed fluid medium externally; or, During operation, the supply flow on-off control switch causes the supply flow medium discharge channel to continuously alternate between an on state and an off state, so that the control valve externally supplies pulsed fluid medium. At the same time, the return flow on-off control switch in the same flow path as the supply flow on-off control switch causes the return flow medium inlet channel to continuously alternate between an on state and an off state or to be in a continuously on state, so that the return flow medium cavity receives the returned fluid medium.

5. The control valve according to claim 4, wherein the drive unit is a drive motor, and the supply flow on-off control switch is a first rotating body having a first channel. During operation, the first rotating body is driven by the drive motor and rotates at a set speed. When the first rotating body rotates within a set angle range, the first channel causes the supply flow medium discharge channel it controls to be in an on state; the return flow on-off control switch is a second rotating body having a second channel. During operation, the second rotating body is driven by the drive motor and rotates at a set speed. When the second rotating body rotates to a set angle range, the second channel causes the return flow medium inlet channel it controls to be in an on state.

6. The control valve according to claim 5, wherein the first rotating body of the supply flow on-off control switch and the second rotating body of the return flow on-off control switch in the same flow path are coaxially arranged and driven by the same drive motor; or, the first rotating body of the supply flow on-off control switch and the second rotating body of the return flow on-off control switch in the same flow path are non-linked and are respectively driven by different drive motors.

7. The control valve according to claim 5, wherein the drive motor is a servo motor or a stepper motor, and the control valve further includes an electronic control unit. The drive motor is electrically connected to the electronic control unit to control the frequency at which the supply flow on-off control switch turns on the supply flow medium discharge channel; or, the drive motor is a servo motor or a stepper motor, and the control valve further includes an electronic control unit. The drive motor is electrically connected to the electronic control unit to control the frequency at which the supply flow on-off control switch turns on the supply flow medium discharge channel, and to control the frequency at which the return flow on-off control switch turns on the return flow medium inlet channel.

8. The control valve according to any one of claims 1 to 3 and 5 to 7, wherein the control valve further includes an energy storage unit. The energy storage unit is connected to the supply flow medium cavity to keep the supply flow medium cavity within a set pressure range. The supply flow medium cavity and the return flow medium cavity in the same flow path as it are connected through a one-way control switch with a set opening pressure. When the pressure in the supply flow medium cavity is greater than the set opening pressure, the supply flow medium cavity and the return flow medium cavity are in an on state; or, The control valve further includes an energy storage unit, which is connected to the supply medium cavity to keep the supply medium cavity within a set pressure range. The supply medium cavity and the return medium cavity are connected through an electromagnetic proportional overflow valve with an adjustable opening pressure. When the pressure in the supply medium cavity is greater than the set opening pressure, the supply medium cavity and the return medium cavity are in a connected state.

9. The control valve according to any one of claims 1 to 3 and 5 to 7, characterized in that the supply medium cavity is provided as an ellipsoidal cavity or a spherical cavity; and / or the return medium cavity is provided as an ellipsoidal cavity or a spherical cavity.

10. A control system applying the control valve according to any one of claims 1 to 9, characterized in that the control system includes one or more actuators, and each actuator includes a first medium inlet / outlet end and a second medium inlet / outlet end; one of the supply medium cavities is connected to the first medium inlet / outlet end of at least one actuator to supply the required fluid medium from the supply medium cavity to at least one actuator; the second medium inlet / outlet end of each actuator is connected to a return medium cavity to allow the return medium cavity to receive the returned fluid medium.

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