CN214092499U - Control valve, reversing valve and control system thereof - Google Patents

Abstract

The application discloses a control valve, a reversing valve and a control system comprising the reversing valve, wherein a valve body of the control valve is provided with a first fluid channel, a second fluid channel and a third fluid channel, and the valve body is also provided with a first control switch, a second control switch and a third control switch; when one of the first fluid passage, the second fluid passage and the third fluid passage is in an on state, the other two are in an off state; when the first fluid channel is in a connection state, the control valve is in a working state of supplying fluid working media to the execution element; when the second fluid channel is in a connection state, the control valve is in a working state of fluid working medium backflow; when the third fluid passage is in the connection state, the control valve is in the working state of supplementing the actuating element with fluid working medium. The switching-over valve that the disclosed control valve of this application is constituteed can replace traditional switching-over valve, and can make two imports and exports of executive component independently controllable, simultaneously, the switching-over valve has the brake braking function.

Description

Control valve, reversing valve and control system thereof

Technical Field

The application belongs to the technical field of fluid transmission, especially belongs to the technical field of hydraulic transmission, and in particular relates to a control valve, a reversing valve and a control system thereof.

Background

Fluid transmission technology is widely used in various industries. Especially in the field of construction machinery. Engineering machinery (such as loaders, excavators, cranes, concrete pump trucks and the like with hydraulic systems) has the advantages of high working efficiency, strong operation capacity and the like and is widely applied, so that the operation of installing and the like of high buildings, elevated highways, certain special equipment is simpler, more efficient, more labor-saving and cost-saving due to the appearance of the engineering machinery, and even the work which cannot be completed before can be completed. In the modern construction process, the engineering machinery plays a role of leading to the greatest success. Although the existing engineering machinery can meet the requirements of most engineering, the existing engineering machinery mostly needs operators to operate and implement related operations on site, and even brings great threat to the lives of the operators in certain special working conditions and high-risk application occasions. Taking an excavator as an example, a hydraulic control excavator is an indispensable mechanical device in various earthwork constructions, and is particularly widely applied to work and construction under special working conditions including earthquake relief work, toxic environments, dangerous tunnels, fire fighting and rescue, cliff opening, explosion site cleaning and the like, so that great danger is brought to operators. If the remote and intelligent control operation of the engineering machinery can be realized, the engineering machinery improves the operation safety while liberating the labor force, and the working capacity of the engineering machinery must be greatly improved, and the use and maintenance costs are reduced. However, in order to realize intelligent control of equipment including a hydraulic control system, it is necessary to firstly realize discretization and digitization of the hydraulic system, and the existing hydraulic control system is limited by the structure and functional defects of its constituent elements and the combination defects among components, so that various functions of the hydraulic control system are coupled and restrained with each other, and discretization and digitization of a hydraulic medium are difficult to realize.

The existing reversing valves all comprise a valve body and a valve core matched with the valve body, the number of working positions where the valve core stays in the valve body is two-position, three-position and the like, and the working positions are divided into two-way, three-way, four-way, six-way and the like according to the number of oil ways connected with the valve body; however, no matter what kind of reversing valve, the two working medium inlets and outlets of the executing element are subjected to relevance coupling control at the same time, and one working medium inlet and outlet of the executing element cannot be in a connection state, while the other working medium inlet and outlet end of the executing element can be in a state including a connection state and a disconnection state or a state between the two states, and the function can be flexibly selected, so that most of the existing reversing valves only have a linkage reversing function and do not have the advantage of independent controllability of the two load ports of the executing element. In addition, the existing independent oil port control valve still adopts a slide valve type structure, the reversing valve of the existing independent oil port control valve often has a hydraulic clamping phenomenon, the reversing dead zone is large, especially the requirement on the cleanliness of oil is high, and the existing independent oil port control valve is one of important reasons influencing the application of the reversing valve in a control system.

In order to adapt to high-pressure, discretization, digitization and intelligent control of a hydraulic control system, a novel discretization and digitization control system is required to be combined, innovative conception and design are carried out on the existing reversing valve, and the problems that the existing reversing valve is large in reversing dead zone, many in controlled coupling factors and lack of requirements for flexibly adapting to variable working conditions of an executing element are solved. To this end, the applicant proposed a reversing valve that enables the two ports of the actuator to be controlled independently and that has a braking function.

The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a control valve, switching-over valve and control system thereof to solve at least one technical problem among the above-mentioned technical problem.

The utility model discloses the technical scheme who adopts does:

a control valve comprises a valve body, wherein a first fluid channel, a second fluid channel and a third fluid channel are arranged on the valve body, and a first control switch for controlling the on-off of the first fluid channel, a second control switch for controlling the on-off of the second fluid channel and a third control switch for controlling the on-off of the third fluid channel are also arranged on the valve body; when one of the first fluid passage, the second fluid passage and the third fluid passage is in an on state, the other two are in an off state;

when the first fluid channel is in a connection state, the control valve is in a working state of supplying fluid working media to the execution element;

when the second fluid channel is in a connection state, the control valve is in a working state of fluid working medium backflow;

when the third fluid channel is in the connection state, the control valve is in the working state of supplementing fluid working medium to the execution element.

Further selectively causing the control valve to further include a driving unit, the first control switch being provided as a first rotating body having a flow passage, the second control switch being provided as a second rotating body having a flow passage, the third control switch being provided as a third rotating body having a flow passage; the first rotating body, the second rotating body and the third rotating body are respectively driven by a driving unit.

The first rotating body, the second rotating body and the third rotating body are further selectively set to be coaxially arranged valve cores, a valve core accommodating cavity matched with the valve cores is arranged on the valve body, the valve cores are arranged in the valve core accommodating cavity, the driving unit is set to be a driving motor, the valve cores are in transmission connection with the driving motor, and in the rotating process of the valve cores, the connection state or the disconnection state of the first fluid channel, the second fluid channel and the third fluid channel is controlled.

A flow passage on the first rotating body is further selectively set to be a first through hole penetrating through the valve core side wall, a flow passage on the second rotating body is set to be a second through hole penetrating through the valve core side wall, and a flow passage on the third rotating body is set to be a third through hole penetrating through the valve core side wall; and furthermore, the included angle of the projection of the axis of the first through hole, the axis of the second through hole and the axis of the third through hole at one end of the valve core is in the range of 55-65 degrees.

A fourth control switch is further selectively arranged on the second fluid channel on the downstream side of the second control switch, and when the control valve is in a working state of fluid working medium backflow, the fourth control switch is in an open state;

and a fifth control switch is arranged on the third fluid channel on the upstream side of the third control switch, and when the control valve is in a working state of supplementing fluid working media to the execution element, the fifth control switch is in an open state.

And further selectively communicating the third fluid channel at the upstream side of the fifth control switch with the first fluid channel at the upstream side of the first control switch through a sixth control switch, wherein when the control valve is in a working state of supplying fluid working medium to an actuating element and oil supplement is needed to the actuating element, the sixth control switch is in an open state.

And further selectively enabling the valve body to be further provided with an actuating element working medium pipeline interface end, wherein the first fluid channel on the downstream side of the first control switch, the second fluid channel on the upstream side of the second control switch and the third fluid channel on the downstream side of the third control switch are respectively communicated with the actuating element working medium pipeline interface end.

A directional control valve comprising a first control valve and a second control valve, said first control valve and said second control valve being configured as described in any of the preceding aspects;

the first control valve controlling one of the load ports of the actuator and the second control valve controlling the other of the load ports of the actuator;

the load port of the execution element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

and a working medium inflow channel is further selectively arranged on the valve body, the working medium inflow channel is respectively communicated with the working medium inlet end of the first fluid channel of the first control valve and the working medium inlet end of the first fluid channel of the second control valve through a seventh control switch, and when fluid working medium is provided for the actuating element, the seventh control switch is in an open state.

The reversing valve further comprises an electric control unit selectively, a driving unit comprised by the first control valve is controlled by the electric control unit, and the driving unit comprised by the first control valve respectively controls the on-off of a first fluid channel, a second fluid channel and a third fluid channel of the first control valve according to the set rotating direction and rotating angle; the driving unit of the second control valve is controlled by the electric control unit, and the driving unit of the second control valve respectively controls the on-off of the first fluid channel, the second fluid channel and the third fluid channel of the second control valve according to the set rotating direction and rotating angle.

A control system applying the reversing valve in any one of the preceding claims comprises a fluid working medium source, a pumping unit and an actuating element, wherein the actuating element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

a fluid working medium source is communicated with a working medium inlet end of a first fluid channel of the first control valve through a pumping unit, and a working medium outlet end of the first fluid channel of the first control valve is communicated with a first working medium inlet and outlet port;

a working medium inlet end of a second fluid channel of the first control valve is communicated with the first working medium inlet and outlet port, and a working medium outlet end of the second fluid channel of the first control valve is communicated with a fluid working medium source;

the working medium inlet end of a third fluid channel of the first control valve is communicated with a fluid working medium source, and the working medium outlet end of the third fluid channel of the first control valve is communicated with the first working medium inlet and outlet port;

a fluid working medium source is communicated with a working medium inlet end of a first fluid channel of the second control valve through a pumping unit, and a working medium outlet end of the first fluid channel of the second control valve is communicated with a second working medium inlet and outlet port;

a working medium inlet end of a second fluid channel of the second control valve is communicated with the second working medium inlet and outlet port, and a working medium outlet end of the second fluid channel of the second control valve is communicated with a fluid working medium source;

and the working medium inlet end of a third fluid channel of the second control valve is communicated with a fluid working medium source, and the working medium outlet end of the third fluid channel of the second control valve is communicated with the second working medium inlet and outlet port.

In the present application, those skilled in the art are motivated to arrange necessary components, units or systems where necessary, according to the well-known art in the relevant field.

In the present application, the control system refers to a system that uses a fluid medium as a working medium and can perform control, such as a hydraulic control system and a pneumatic control system.

In the present application, the fluid medium is not particularly limited, and may be a liquid medium or a gaseous medium. In a specific embodiment, the liquid medium is preferably a hydraulic oil.

In the present application, the term "downstream side of a" refers to the downstream position where the fluid working medium flows through a first and then through a second, with reference to the flow direction of the fluid working medium.

By "upstream side of a" is meant with reference to the direction of flow of the fluid working substance, i.e. the fluid working substance flows first through said upstream position of a and then through said a. "

Through control valve, switching-over valve and control system that this application provided can bring following beneficial effect:

1. this application is through making the control valve includes three fluid passage to make every fluid passage all controlled by control switch control, through two the control valve is controlled same executive component's fluid medium's flow respectively, two moreover the control valve can not only independently control in control to executive component's load mouth when realizing the switching-over valve function, can select multiple oil circuit moreover more in a flexible way, with the changeable operating mode of adaptation load.

2. Because the reversing valve that this application was formed by two independent control valves has independent control's characteristics to working medium feed passageway and working medium return flow channel, so realize the brake function under some operating mode, for example when the big arm of excavator is by high-order to low level motion, under the effect of gravity, big arm has the trend to low level motion, through setting up on the control return flow channel the alternative throttle of the quick switching of control valve has reduced throttling loss, has also avoided great hydraulic shock, and then makes big arm can steadily and controllably have high-order to low level motion, under the circumstances that does not influence the normal work of system, realizes inching brake braking's function.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a control valve provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a control valve provided in an embodiment of the present application;

FIG. 3 is a schematic view of the projection of the axis of the first through hole, the axis of the second through hole and the axis of the third through hole on the valve core at one end of the valve core;

fig. 4 is a schematic diagram of a reversing valve provided in an embodiment of the present application.

Wherein the content of the first and second substances,

1, 11 a first fluid passage, 12 a second fluid passage, 13 a third fluid passage, 14 a spool,

2 a first control switch, 21 a first rotation body, 211 a first through hole,

3 a second control switch, 31 a second rotating body, 311 a second through hole,

4 a third control switch, 41 a third rotating body, 411 a third through hole,

5 a fourth control switch for controlling the operation of the motor,

6 a fifth control switch for controlling the operation of the motor,

7 a sixth control switch for controlling the operation of the motor,

8 a seventh control switch for controlling the operation of the motor,

9 a drive unit for driving the motor, the motor being,

10 an interface end of an actuating element working medium pipeline,

20 a first control valve for controlling the flow of air,

30 second control valve.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the description of the present application, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, references to the description of the terms "an aspect," "some aspects," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the aspect or example is included in at least one aspect or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same solution or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more aspects or examples.

For convenience of description, the terms "front", "rear", "left", "right", "up" and "down" will be used with respect to the orientation of the control valve relative to the user.

In the present application, the fluid working medium is not particularly limited, and may be a liquid working medium or a gas working medium. In a specific embodiment, the liquid working medium is preferably hydraulic oil.

In the present application, the number is included in a certain number or more, and two or more, for example.

A control valve as shown in fig. 1 and fig. 2, which includes a valve body 1, wherein the valve body 1 is provided with a first fluid passage 11, a second fluid passage 12 and a third fluid passage 13, and the valve body 1 is further provided with a first control switch 2 for controlling on/off of the first fluid passage 11, a second control switch 3 for controlling on/off of the second fluid passage 12 and a third control switch 4 for controlling on/off of the third fluid passage 13; in operation, when one of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 is in an on state, the other two are in an off state; when the first fluid channel 11 is in a connection state, the control valve is in a working state of supplying fluid working medium to the execution element; when the second fluid channel 12 is in a connection state, the control valve is in a working state of fluid working medium backflow; when the third fluid channel 13 is in the connected state, the control valve is in the operating state in which it supplies fluid medium to the actuator. In specific implementation, the first control switch 2, the second control switch 3 and the third control switch 4 can be selectively and independently arranged, and the first control switch 2, the second control switch 3 and the third control switch 4 are respectively driven by one driving unit 9; as an alternative embodiment, at least two of the first control switch 2, the second control switch 3 and the third control switch 4 can also be selectively associated and driven by a drive unit 9; preferably, the first control switch 2, the second control switch 3 and the third control switch 4 are all arranged in a mutual relation, and the opening and closing of the first control switch 2, the second control switch 3 and the third control switch 4 are driven by the same driving unit 9. In practical implementation, the driving unit 9 may be further selectively set as a driving motor, and it is still further preferable that the driving motor is set as a servo motor or a stepping motor. In specific operation, the first fluid channel 11, the second fluid channel 12 and the third fluid channel 13 can be in an off state simultaneously under the action of the first control switch 2, the second control switch 3 and the third control switch 4. The control valve comprises three fluid channels, each fluid channel is controlled by a control switch, the flow of fluid media of the same actuating element is controlled by the two control valves respectively, and the two control valves can be controlled independently in control while the function of the reversing valve is realized.

As a preferred embodiment of the present application, all the aforementioned embodiments and their modified embodiments of the present application can further selectively provide that the first control switch 2 is provided as a first rotating body 21 having a flow passage, the second control switch 3 is provided as a second rotating body 31 having a flow passage, and the third control switch 4 is provided as a third rotating body 41 having a flow passage; the first, second, and third rotating bodies 21, 31, and 41 are driven by a driving unit 9, respectively. In specific implementation, a rotating body installation position matched with the first rotating body 21, the second rotating body 31 and the third rotating body 41 can be further selectively arranged on the valve body 1, the first rotating body 21, the second rotating body 31 and the third rotating body 41 are respectively matched with the rotating body installation position, and the first fluid channel 11, the second fluid channel 12 and the third fluid channel 13 are in a connection or disconnection state according to requirements in the rotating process of the first rotating body 21, the second rotating body 31 and the third rotating body 41.

As a preferred embodiment of the present application, in all embodiments including the first rotating body 21, the second rotating body 31 and the third rotating body 41, the first rotating body 21, the second rotating body 31 and the third rotating body 41 may be further selectively provided as a coaxially disposed valve core 14, the valve body 1 is provided with a valve core receiving cavity adapted to the valve core 14, the valve core 14 is disposed in the valve core receiving cavity, the driving unit 9 is provided as a driving motor, the valve core 14 is in transmission connection with the driving motor, and during the rotation of the valve core 14, the on state or the off state of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 is controlled; in a specific implementation, the flow passage on the first rotating body 21 is further selectively set as a first through hole 211 penetrating through the valve core side wall, the flow passage on the second rotating body 31 is set as a second through hole 311 penetrating through the valve core side wall, and the flow passage on the third rotating body 41 is set as a third through hole 411 penetrating through the valve core side wall; the included angle of the projection of the axis of the first through hole 211, the axis of the second through hole 311 and the axis of the third through hole 411 at one end of the valve core 14 is in the range of 55-65 degrees; as shown in fig. 3, it is further preferable that an included angle of a projection of an axis of the first through hole 211, an axis of the second through hole 311, and an axis of the third through hole 411 on one end of the valve core 14 is 60 °. In practical implementation, in order to enable the driving unit 9 to provide a sufficient torque, the valve element 14 may be further selectively driven to rotate by selecting the driving motor with a larger driving power or by enabling the driving motor to pass through a speed reducer with a proper transmission ratio.

As a preferred embodiment of the present application, as shown in fig. 2, the present application can further selectively provide a fourth control switch 5 on the second fluid channel 12 of the control valve on the downstream side of the second control switch 3, and when the control valve is in the working state of fluid working medium backflow, the fourth control switch 5 is in the open state; and a fifth control switch 6 is arranged on the third fluid channel 13 at the upstream side of the third control switch 4, and when the control valve is in a working state of supplementing fluid working medium to the executive element, the fifth control switch 6 is in an open state. In specific implementation, the fourth control switch 5 is further selectively set as a controlled switch or the fourth control switch 5 is set as a check valve, and when the second fluid channel 12 is in the on state, the fourth control switch 5 is in the on state. In this embodiment, the fifth control switch 6 may be further selectively set to a controlled switch or the fifth control switch 6 may be set to a check valve, and when the third fluid passage 13 is in the on state, the fifth control switch 6 may be in the on state.

As a preferred embodiment of the present invention, all embodiments of the present application including the fifth control switch 6 can further selectively communicate the third fluid channel 13 at the upstream side of the fifth control switch 6 with the first fluid channel 11 at the upstream side of the first control switch 2 through a sixth control switch 7, and when the control valve is in an operating state of supplying fluid to the actuator and oil needs to be replenished to the actuator, the sixth control switch 7 is in an open state; for example, when the actuator is driven by a load during operation during supply of fluid to the actuator, the sixth control switch 7 is opened to replenish the actuator with fluid. In the present embodiment, in a concrete implementation, the sixth control switch 7 may be further selectively set to a controlled switch or the sixth control switch 7 may be set to a check valve.

As a preferred embodiment of the present application, as shown in fig. 2, all the aforementioned embodiments of the present application can further selectively provide an actuator working medium interface end 10 on the valve body 1, and the first fluid channel 11 on the downstream side of the first control switch 2, the second fluid channel 12 on the upstream side of the second control switch 3, and the third fluid channel 13 on the downstream side of the third control switch 4 are respectively communicated with the actuator working medium interface end 10. In specific implementation, the actuating element working medium pipeline interface end 10 is connected with a working medium inlet and outlet port of the actuating element through a fluid pipeline.

The application also discloses a reversing valve, as shown in fig. 4, the reversing valve comprises a first control valve 20 and a second control valve 30, the first control valve 20 and the second control valve 30 are set as the control valves of any one of the previous embodiments, examples and changeable embodiments and examples; the first control valve 20 controls one of the load ports of the actuator and the second control valve 30 controls the other load port of the actuator; the load port of the execution element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

when the first fluid passage 11 of the first control valve 20 is in the on state, the first fluid passage 11 of the second control valve 30 is in the off state and the second fluid passage 12 thereof is in the on state; when the second fluid passage 12 of the first control valve 20 is in the on state, the second fluid passage 12 of the second control valve 30 is in the off state and the first fluid passage 11 thereof is in the on state; when the first fluid passage 11 of the second control valve 30 is in the on state, the first fluid passage 11 of the first control valve 20 is in the off state and the second fluid passage 12 thereof is in the on state; when the second fluid passage 12 of the second control valve 30 is in the on state, the second fluid passage 12 of the first control valve 20 is in the off state and the first fluid passage 11 thereof is in the on state.

As a preferred embodiment of the present application, in the foregoing reversing valve, when the reversing valve is implemented specifically, a working medium inflow channel may be further selectively provided on the valve body 1, the working medium inflow channel is respectively communicated with the working medium inlet end of the first fluid channel 11 of the first control valve 20 and the working medium inlet end of the first fluid channel 11 of the second control valve 30 through a seventh control switch 8, and when a fluid working medium is provided to an actuator, the seventh control switch 8 is in an open state. In specific implementation, the seventh control switch 8 may be selectively located on the valve body or disposed outside the valve body.

As a variable embodiment, the valve body 1 of the first control valve 20 and the second control valve 30 included in the direction valve described in the present application may be integrally provided or separately provided.

As a preferred embodiment of the present application, all of the aforementioned directional control valves of the present application may further selectively enable the directional control valve to include an electronic control unit, the driving unit 9 included in the first control valve 20 is controlled by the electronic control unit, and the driving unit 9 included in the first control valve 20 controls the on/off of the first fluid passage 11, the second fluid passage 12 and the third fluid passage 13 of the first control valve 20 according to a set rotation direction and a set rotation angle, respectively; and further selectively enabling the driving unit 9 included in the second control valve 30 to be controlled by the electronic control unit, wherein the driving unit 9 included in the second control valve 30 controls the on-off of the first fluid channel 11, the second fluid channel 12 and the third fluid channel 13 of the second control valve 30 according to the set rotation direction and rotation angle respectively. The reversing valve formed by the two independent control valves has the characteristic of independent control on the working medium supply channel and the working medium return channel, so that the reversing valve can meet the requirement of realizing more functions; for example, the brake function is realized under certain working conditions, specifically, for example, when a large arm of an excavator moves from a high position to a low position, the large arm has a tendency of moving to the low position under the action of gravity, and the large arm can stably and controllably move from the high position to the low position by controlling the opening and closing of the control valve arranged on the backflow channel, so that the brake function is realized under the condition that the normal operation of a system is not influenced. In addition, two control valves included in the reversing valve are respectively driven by different driving units, when the driving unit is set as a driving motor or a driving unit including the driving motor, the driving motor is controlled by the control unit, so that accurate control of each control valve is realized, and a technical basis is provided for intellectualization of a control system.

The application also discloses a control system applying the reversing valve, which is described below with reference to fig. 4, wherein the control system comprises a fluid working medium source, a pumping unit and an actuating element, and the actuating element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port; a fluid working medium source is communicated with a working medium inlet end of the first fluid channel 11 of the first control valve 20 through a pumping unit, and a working medium outlet end of the first fluid channel 11 of the first control valve 20 is communicated with a first working medium inlet and outlet port through a port A in the figure 4; the working medium inlet end of the second fluid channel 12 of the first control valve 20 is communicated with the first working medium inlet and outlet port through the port A in FIG. 4, and the working medium outlet end of the second fluid channel 12 of the first control valve 20 is communicated with a fluid working medium source; the working medium inlet end of the third fluid channel 13 of the first control valve 20 is communicated with a fluid working medium source through a port T1 in FIG. 4, and the working medium outlet end of the third fluid channel 13 of the first control valve 20 is communicated with the first working medium inlet and outlet port through a port A in FIG. 4;

a fluid working medium source is communicated with a working medium inlet end of the first fluid channel 11 of the second control valve 30 through a pumping unit, and a working medium outlet end of the first fluid channel 11 of the second control valve 30 is communicated with the second working medium inlet and outlet port through a port B in the figure 4; the working medium inlet end of the second fluid channel 12 of the second control valve 30 is communicated with the second working medium inlet and outlet port through a port B in FIG. 4, and the working medium outlet end of the second fluid channel 12 of the second control valve 30 is communicated with a fluid working medium source; the working medium inlet end of the third fluid channel 13 of the second control valve 30 is communicated with a fluid working medium source through a port T2 in FIG. 4, and the working medium outlet end of the third fluid channel 13 of the second control valve 30 is communicated with the second working medium inlet and outlet port through a port B in FIG. 4; the inlet end of the first fluid channel 11 of the first control valve 20 is communicated with the inlet end of the first fluid channel 11 of the second control valve 30, the seventh control switch 8 is arranged at the upstream of the communication position, and the inlet end P of the seventh control switch 8 is communicated with a fluid working medium source; the inlet end of the second fluid passage 12 of the first control valve 20 and the inlet end of the second fluid passage 12 of the second control valve 30 are communicated and merged and then communicated with the working medium source through P' in FIG. 4. As a variable embodiment, the inlet end of the first fluid passage 11 of the first control valve 20 and the inlet end of the first fluid passage 11 of the second control valve 30 may be independently provided; and/or the inlet end of the second fluid passage 12 of the first control valve 20 and the inlet end of the second fluid passage 12 of the second control valve 30 are independently provided.

When the control system is implemented, the fluid working medium sources can be selectively set to be one, two, three or more than four, and the control system can be specifically set according to actual needs.

In the present application, when implemented, the actuator is further selectively set to be a pneumatic actuator or a hydraulic actuator, such as a fluid motor, a cylinder, or a hydraulic cylinder.

The attached drawings are only schematic, and any technical scheme meeting the written description of the application belongs to the protection scope of the application.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (11)

1. A control valve is characterized in that the control valve is provided with a valve body,

the valve body is provided with a first fluid channel, a second fluid channel and a third fluid channel, and the valve body is also provided with a first control switch for controlling the on-off of the first fluid channel, a second control switch for controlling the on-off of the second fluid channel and a third control switch for controlling the on-off of the third fluid channel;

when one of the first fluid passage, the second fluid passage and the third fluid passage is in an on state, the other two are in an off state;

when the first fluid channel is in a connection state, the control valve is in a working state of supplying fluid working media to the execution element;

when the second fluid channel is in a connection state, the control valve is in a working state of fluid working medium backflow;

when the third fluid channel is in the connection state, the control valve is in the working state of supplementing fluid working medium to the execution element.

2. The control valve of claim 1,

the control valve further comprises a drive unit which,

the first control switch is set as a first rotating body with a flow passage, the second control switch is set as a second rotating body with a flow passage, and the third control switch is set as a third rotating body with a flow passage;

the first rotating body, the second rotating body and the third rotating body are respectively driven by a driving unit.

3. The control valve of claim 2,

the first rotating body, the second rotating body and the third rotating body are coaxially arranged valve cores, a valve core accommodating cavity matched with the valve cores is arranged on the valve body, the valve cores are arranged in the valve core accommodating cavity, the driving unit is a driving motor, the valve cores are in transmission connection with the driving motor, and the connection state or the disconnection state of the first fluid channel, the second fluid channel and the third fluid channel is controlled in the rotating process of the valve cores.

4. The control valve of claim 3,

a flow passage on the first rotating body is provided with a first through hole penetrating through the side wall of the valve core, a flow passage on the second rotating body is provided with a second through hole penetrating through the side wall of the valve core, and a flow passage on the third rotating body is provided with a third through hole penetrating through the side wall of the valve core;

the included angle of the projection of the axis of the first through hole, the axis of the second through hole and the axis of the third through hole at one end of the valve core is in the range of 55-65 degrees.

5. The control valve of claim 1,

a fourth control switch is arranged on the second fluid channel at the downstream side of the second control switch, and when the control valve is in a working state of fluid working medium backflow, the fourth control switch is in an open state;

and a fifth control switch is arranged on the third fluid channel on the upstream side of the third control switch, and when the control valve is in a working state of supplementing fluid working media to the execution element, the fifth control switch is in an open state.

6. The control valve of claim 5,

and the third fluid channel at the upstream side of the fifth control switch is communicated with the first fluid channel at the upstream side of the first control switch through a sixth control switch, and when the control valve is in a working state of supplying fluid working media to the actuating element and oil supplement is needed to be carried out on the actuating element, the sixth control switch is in an open state.

7. The control valve according to any one of claims 1 to 6,

the valve body is also provided with an actuating element working medium pipeline interface end, and the first fluid channel at the downstream side of the first control switch, the second fluid channel at the upstream side of the second control switch and the third fluid channel at the downstream side of the third control switch are respectively communicated with the actuating element working medium pipeline interface end.

8. A reversing valve is characterized in that a valve body is provided with a valve body,

the direction valve includes a first control valve and a second control valve provided as the control valve according to any one of claims 2 to 7; the first control valve controlling one of the load ports of the actuator and the second control valve controlling the other of the load ports of the actuator;

the load port of the actuating element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port.

9. The reversing valve of claim 8,

the valve body is also provided with a working medium inflow channel, the working medium inflow channel is respectively communicated with the working medium inlet end of the first fluid channel of the first control valve and the working medium inlet end of the first fluid channel of the second control valve through a seventh control switch, and when fluid working medium is provided for the actuating element, the seventh control switch is in an open state.

10. The reversing valve according to claim 8 or 9,

the reversing valve comprises an electric control unit, a driving unit included in the first control valve is controlled by the electric control unit, and the driving unit included in the first control valve respectively controls the on-off of a first fluid channel, a second fluid channel and a third fluid channel of the first control valve according to the set rotating direction and rotating angle;

the driving unit of the second control valve is controlled by the electric control unit, and the driving unit of the second control valve respectively controls the on-off of the first fluid channel, the second fluid channel and the third fluid channel of the second control valve according to the set rotating direction and rotating angle.

11. A control system for a reversing valve according to any of claims 8 to 10,

the control system comprises a fluid working medium source, a pumping unit and an executing element, wherein the executing element comprises a first working medium inlet and outlet port and a second working medium inlet and outlet port;

a fluid working medium source is communicated with a working medium inlet end of a first fluid channel of the first control valve through a pumping unit, and a working medium outlet end of the first fluid channel of the first control valve is communicated with a first working medium inlet and outlet port;

a working medium inlet end of a second fluid channel of the first control valve is communicated with the first working medium inlet and outlet port, and a working medium outlet end of the second fluid channel of the first control valve is communicated with a fluid working medium source;

the working medium inlet end of a third fluid channel of the first control valve is communicated with a fluid working medium source, and the working medium outlet end of the third fluid channel of the first control valve is communicated with the first working medium inlet and outlet port;

a fluid working medium source is communicated with a working medium inlet end of a first fluid channel of the second control valve through a pumping unit, and a working medium outlet end of the first fluid channel of the second control valve is communicated with a second working medium inlet and outlet port;

a working medium inlet end of a second fluid channel of the second control valve is communicated with the second working medium inlet and outlet port, and a working medium outlet end of the second fluid channel of the second control valve is communicated with a fluid working medium source;

and the working medium inlet end of a third fluid channel of the second control valve is communicated with a fluid working medium source, and the working medium outlet end of the third fluid channel of the second control valve is communicated with the second working medium inlet and outlet port.

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