CN214331035U - Fluid control device and control system comprising same - Google Patents

Fluid control device and control system comprising same Download PDF

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Publication number
CN214331035U
CN214331035U CN202022843374.3U CN202022843374U CN214331035U CN 214331035 U CN214331035 U CN 214331035U CN 202022843374 U CN202022843374 U CN 202022843374U CN 214331035 U CN214331035 U CN 214331035U
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medium
cavity
backflow
fluid
flow supply
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王洪涛
黄爱武
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Weifang Jiateng Hydraulic Technology Co ltd
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Weifang Jiateng Hydraulic Technology Co ltd
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Abstract

The application discloses a fluid control device and a control system thereof, wherein the fluid control device comprises a control valve, a flow supply medium containing cavity and a backflow medium containing cavity are arranged inside a valve body of the control valve, a flow supply medium inlet channel and a flow supply medium outlet channel which are communicated with the flow supply medium containing cavity are arranged on the valve body, and a backflow medium inlet channel and a backflow medium outlet channel which are communicated with the backflow medium containing cavity are arranged on the valve body; the control valve also comprises a flow supply on-off control switch and a backflow on-off control switch, the flow supply on-off control switch controls the opening and closing of the flow supply medium discharge channel, and the backflow on-off control switch controls the opening and closing of the backflow medium inlet channel; the fluid control device also comprises a negative pressure generating device, the backflow medium containing cavity is connected with the negative pressure generating device, and when the negative pressure generating device is in a working condition of forming negative pressure, fluid in the backflow medium containing cavity flows out. The fluid control device can replace a traditional multi-way valve and can provide a technical basis for digital and intelligent control of a hydraulic control system.

Description

Fluid control device and control system comprising same
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 fluid control device and a control system comprising the same.
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 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 cost, the maintenance cost and the like are reduced. However, if the intelligent control cost of the equipment containing the hydraulic control system is too high to realize by a timely feedback adjustment method, the current technical conditions are difficult to realize, therefore, in combination with the technical characteristics of the existing electronic-electrical discretization digital control, the discretization and digitization of the hydraulic system are necessarily preferred for the intelligent control of the hydraulic technology, the existing hydraulic control system is limited by the structure and functional defects of the components and the combination defects among the components, so that the various functions of the hydraulic control system are mutually coupled and mutually contained, the discretization and digitization of the hydraulic medium are difficult to realize, and under the existing technical strength, the realization of the intelligent control of the hydraulic control system is only a fitting algorithm which is continuously adjusted, the quantization control is difficult to realize, so that the combination of various components and components contained in the existing hydraulic control system needs to be purposefully re-conceived, And (5) redesigning.
In any existing hydraulic control system, the hydraulic control system needs to have multiple functions (for example, the existing excavator needs to control a hydraulic actuator through the hydraulic control system to realize the functions of amplitude variation, hydraulic control walking and hydraulic control rotation between arms), therefore, a multi-way valve is necessarily needed to be arranged, however, in order to save installation space and facilitate operation and control, the multi-way valve is often formed by overlapping single-chip valves, and shares one oil supply oil path and one oil return oil path, and the oil supply pressure and the flow between the single-chip valves are mutually coupled and mutually interfere no matter in series or in parallel, so that digitization and discretization are difficult to realize, and accurate control and intelligent control cannot be further implemented.
The existing multi-way valve has single requirement on each execution element, and is formed by overlapping a plurality of single-chip valves according to the requirements of functions and working conditions and connecting the single-chip valves through bolts in order to facilitate processing and improve the processing precision.
The single-chip valve in the existing multi-way valve is usually a valve core which controls the opening and closing of an oil supply oil path, an oil inlet of an actuating element, an oil return oil path and an oil outlet of the actuating element together, the opening and closing states of different oil paths are coupled together and used for changing the flowing direction of fluid or adjusting the flow of the actuating element through the opening degree of a throttling opening, mutual influence is bound to occur among the actuating elements, and the realization of discretization, digitization and intelligent control of the existing fluid system comprising the multi-way valve is seriously influenced.
In addition to the above defects, the existing multi-way valve often has the problem of large vibration in the use process of equipment comprising a hydraulic control system, so that the problem of inter-plate leakage of the multi-way valve formed by overlapping a plurality of single-plate valves is solved by thickening a connecting bolt and increasing a connecting locking moment, but the problem of inter-plate leakage still occurs after the multi-way valve is used for a period of time along with the influence of factors such as the fatigue and the tension of the bolt and the like; it is worth noting that as the connection locking torque of the bolt is increased, the valve body of the multi-way valve is deformed due to the parallelism, flatness, material creep and the like of the valve body connection surface through the sealing mode of compression deformation among the sheets, so that the movement of the matched precise valve core is influenced, and even the problem of valve core clamping stagnation in the multi-way valve is easily caused; along with the increase of the length of the connecting bolt, uneven stress and fatigue creep deformation are caused more, so that the thickness of each piece of the conventional multi-way valve is reduced as much as possible, a flow channel of the multi-way valve is narrowed and bent, and meanwhile, the pressure loss is increased steeply, so that the conventional multi-way valve has a plurality of technical bottlenecks which are difficult to avoid.
In addition, in the prior art, the actuator (especially the hydraulic oil cylinder) needs to discharge the fluid medium on the non-working side from the inside, the back pressure exists on the discharge part due to the blocking effect of the throttling orifice and the pipeline element, and the power generated by the back pressure is in most cases an ineffective or harmful power consumption which blocks the normal work of the actuator, belongs to an ineffective power which causes the heating of the fluid medium, and causes the response delay of the actuator to influence the working efficiency. Therefore, a negative pressure channel should be established for positive work, for which purpose the present invention comprises a negative pressure generating device.
In order to solve the problems of discretization, digitization and intelligent control of the existing hydraulic control system, a novel discretization and digitization control system needs to be combined, innovative conception and design are carried out on the existing multi-way valve, and the problems that the existing multi-way valve is large in reversing dead zone, large in control coupling factor and short in requirement of flexibly adapting to the variable working condition of an executing element are solved. To this end, the applicant proposes a control valve and a control system applying the control valve, which are capable of solving at least the above-mentioned technical problems of the prior multi-way valve.
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 fluid control device reaches control system including it to solve at least one technical problem among the above-mentioned technical problem.
The utility model discloses the technical scheme who adopts does:
a fluid control device comprises a control valve, wherein the control valve comprises a valve body, a flow supply medium cavity and a backflow medium cavity are arranged in the valve body, a flow supply medium inlet channel and a flow supply medium outlet channel which are communicated with the flow supply medium cavity are arranged on the valve body, and a backflow medium inlet channel and a backflow medium outlet channel which are communicated with the backflow medium cavity are arranged on the valve body;
the control valve also comprises a flow supply on-off control switch and a backflow on-off control switch, the flow supply on-off control switch controls the opening and closing of the flow supply medium discharge channel, and the backflow on-off control switch controls the opening and closing of the backflow medium inlet channel;
the flow supply medium cavity provides fluid medium for the actuating element, and the backflow medium cavity receives backflow fluid medium;
the current supply on-off control switch and the backflow on-off control switch are driven by a driving unit;
the fluid control device also comprises a negative pressure generating device, the backflow medium containing cavity is connected with the negative pressure generating device, and when the negative pressure generating device is in a working condition of forming negative pressure, fluid in the backflow medium containing cavity flows out; when the negative pressure generating device is in a non-working condition, the negative pressure generating device is used as a passage for discharging fluid media in the backflow medium containing cavity.
The negative pressure generating device is further selectively set to be a cylinder piston mechanism, the cylinder piston mechanism comprises a cylinder and a piston, the piston and the cylinder form a first accommodating cavity with variable volume, and the cylinder is provided with a first medium inlet and a first medium outlet which are communicated with the first accommodating cavity; the backflow medium cavity is connected with the first medium inlet through the backflow medium discharge channel, a first switch unit for controlling the on-off of the backflow medium discharge channel is arranged on the backflow medium discharge channel, and a second switch unit is arranged on the first medium outlet or a fluid channel at the downstream of the first medium outlet;
when the volume of the first cavity is increased, the first switch unit on the backflow medium discharge channel on the working flow path is in an open state, and the second switch unit is in a closed state;
when the volume of the first cavity is reduced, the first switch unit on the return medium discharge passage on the working flow path is in an off state, and the second switch unit is in an on state.
The application also discloses a fluid control device, which comprises a control valve, wherein the control valve comprises a valve body, two or more flow medium supply cavities and at least one backflow medium cavity are arranged in the valve body, and each flow medium supply cavity is matched with one or more backflow medium cavities and serves as a component of the same flow path;
each flow supply medium accommodating cavity is respectively communicated with a flow supply medium inlet channel arranged on the valve body and at least one flow supply medium discharge channel arranged on the valve body, and a flow supply on-off control switch is arranged on each flow supply medium discharge channel;
each backflow medium containing cavity is respectively communicated with at least one backflow medium inlet channel arranged on the valve body and a backflow medium outlet channel arranged on the valve body, and a backflow on-off control switch is arranged on each backflow medium inlet channel;
the flow supply medium cavity provides fluid medium for the actuating element, and the backflow medium cavity receives backflow fluid medium; the current supply on-off control switch and the backflow on-off control switch are driven by a driving unit;
the fluid control device also comprises a negative pressure generating device, wherein a backflow medium containing cavity is connected with the negative pressure generating device, the backflow medium containing cavities arranged on the valve body are respectively connected with the negative pressure generating device, and when the negative pressure generating device is in a working condition of forming negative pressure, fluid in the backflow medium containing cavities flows out; when the negative pressure generating device is in a non-working condition, the negative pressure generating device is used as a passageway for discharging fluid in the backflow medium cavity.
The negative pressure generating device is further selectively set to be a cylinder piston mechanism, the cylinder piston mechanism comprises a cylinder body and a piston, the piston and the cylinder body form a first containing cavity and a second containing cavity with variable volumes, and the cylinder body is provided with a first medium inlet and a first medium outlet which are communicated with the first containing cavity and a second medium inlet and a second medium outlet which are communicated with the second containing cavity;
each of a part of the backflow medium containing cavities is communicated with the first containing cavity through a backflow medium discharge passage and a first medium inlet, each of the other part of the backflow medium containing cavities is communicated with the second containing cavity through a backflow medium discharge passage and a second medium inlet, a first switch unit is arranged on each backflow medium discharge passage, and the backflow medium containing cavity communicated with the first containing cavity is communicated with at least one of the backflow medium containing cavities communicated with the second containing cavity through a third switch unit;
a second switching unit is respectively arranged on the first medium outlet or the fluid channel at the downstream of the first medium outlet and the second medium outlet or the fluid channel at the downstream of the second medium outlet;
when the volume of the first cavity is increased, a first switch unit which is positioned on a working flow path and is connected with the first cavity and on a backflow medium discharge passage is in an open state, and a second switch unit which is connected with the first cavity is in a closed state;
when the volume of the first cavity is reduced, a first switch unit which is positioned on a working flow path and is connected with the first cavity and on a backflow medium discharge passage is in a turn-off state, and a second switch unit which is connected with the first cavity is in a turn-on state;
when the volume of the second cavity is increased, a first switch unit which is positioned on a working flow path and is connected with the second cavity and on a backflow medium discharge passage is in an open state, and a second switch unit which is connected with the second cavity is in a closed state;
when the volume of the second cavity is reduced, a first switch unit which is positioned on a working flow path and is connected with the second cavity and on a backflow medium discharge passage is in a turn-off state, and a second switch unit which is connected with the second cavity is in a turn-on state;
when the pressure difference in the backflow medium containing cavity connected with the third switching unit is below a set value, the third switching unit is in an off state, and when the pressure difference in the backflow medium containing cavity connected with the third switching unit is above the set value, the third switching unit is in an on state.
The piston mechanism of the cylinder body is further selectively driven by the reciprocating driving mechanism to enable the piston to reciprocate in the cylinder body, the third switch unit comprises a first one-way switch and a second one-way switch which are arranged in parallel, the switching-on direction of the first one-way switch is opposite to the switching-on direction of the second one-way switch, and when the piston reciprocates, the first one-way switch and the second one-way switch are selectively opened so that the first containing cavity and the second containing cavity can both obtain fluid media from the reflux medium containing cavity communicated with the first containing cavity and the second containing cavity in the reciprocating process of the piston mechanism of the cylinder body.
When the pulse fluid medium discharge valve works, the supply on-off control switch is further selectively selected to enable the supply medium discharge channel to be in an alternating working state of on and off continuously, so that the control valve supplies pulse fluid medium to the outside; or, the supply on-off control switch is selectively enabled to enable the supply medium discharge channel to be in an on-off alternative working state continuously, so that the control valve supplies pulse type fluid medium to the outside, and meanwhile, the backflow on-off control switch which is in the same flow path with the supply on-off control switch enables the backflow medium inlet channel to be in the on-off alternative working state continuously or in the on-off state continuously, so that the backflow medium accommodating cavity accommodates the backflow fluid medium.
The driving unit is further selectively set as a driving motor, the flow supply on-off control switch is set as a first rotating body with a first channel, the first rotating body is driven by the driving motor and rotates according to a set rotating speed during operation, and when the first rotating body rotates to a set angle range, the first channel enables the flow supply medium discharge channel controlled by the first channel to be in a connection state;
the backflow on-off control switch is a second rotating body with a second channel, when the backflow on-off control switch works, the second rotating body is driven by the driving motor and rotates according to a set rotating speed, and when the second rotating body rotates to a set angle range, the second channel enables the backflow medium controlled by the second rotating body to enter the channel to be in a connected state;
the first rotating body of the flow supply on-off control switch and the second rotating body of the backflow on-off control switch which are positioned in the same flow path are coaxially arranged and driven by the same driving motor, or the first rotating body of the flow supply on-off control switch and the second rotating body of the backflow on-off control switch which are positioned in the same flow path are arranged in a non-linkage way and driven by different driving motors.
The fluid control device further comprises an electric control unit, wherein the driving motor is electrically connected with the electric control unit to control the frequency of the flow supply on-off control switch for switching on the flow supply medium discharge channel; or, the driving motor is selectively set as a servo motor or a stepping motor, the fluid control device further comprises an electric control unit, and the driving motor is electrically connected with the electric control unit to control the frequency of the flow supply on-off control switch for switching on the flow supply medium discharge channel and the frequency of the backflow on-off control switch for switching on the backflow medium inlet channel.
The fluid control device further selectively enables the fluid control device to further comprise an energy storage unit, the energy storage unit is connected with the flow supply medium cavity so that the flow supply medium cavity is in a set pressure range, the flow supply medium cavity is communicated with the backflow medium cavity in the same flow path with the flow supply medium cavity through a one-way control switch with set opening pressure, and when the pressure in the flow supply medium cavity is larger than the set opening pressure, the flow supply medium cavity and the backflow medium cavity are in a communicated state; or, the fluid control device further includes an energy storage unit, the energy storage unit is connected to the flow supply medium cavity to enable the flow supply medium cavity to be in a set pressure range, the flow supply medium cavity and the return flow medium cavity are communicated through an electromagnetic proportional relief valve with an adjustable opening pressure, and when the pressure in the flow supply medium cavity is greater than the set opening pressure, the flow supply medium cavity and the return flow medium cavity are in a connected state.
The flow supply medium cavity is further selectively set to be an ellipsoidal cavity or a spherical cavity, and when the flow supply medium cavity is set to be the ellipsoidal cavity, a connection interface of the energy storage unit and the flow supply medium cavity is arranged at a valve body which is over against a focus of the section of the flow supply medium cavity; when the flow supply medium cavity is set to be a spherical cavity, the connection interface of the energy storage unit and the flow supply medium cavity is arranged at the valve body opposite to the spherical center of the flow supply medium cavity. And then reduce the hydraulic shock that the quick break-make of confession flow on-off control switch caused or the hydraulic pressure pulsation that the pumping unit caused to the system caused the influence, make confession flow medium appearance chamber can keep more stable operating pressure to satisfy the requirement of the pulse flow who provides stable pressure fast better.
The fluid connecting pipeline between the pumping unit and the flow supply medium cavity and the connecting interface of the flow supply medium cavity are further selectively arranged at the valve body which is opposite to the focus of the section of the flow supply medium cavity; when the flow supply medium cavity is set to be a spherical cavity, a connection interface of a fluid connection pipeline between the pumping unit and the flow supply medium cavity is arranged at a valve body which is opposite to the center of a sphere of the flow supply medium cavity. The influence of hydraulic impact caused by quick on-off of the flow supply on-off control switch or hydraulic pulsation caused by the pumping unit on a system can be reduced, so that the flow supply medium accommodating cavity can keep stable working pressure, and the requirement of quickly providing pulse flow with stable pressure can be better met.
And the backflow medium containing cavity is further selectively made to be spherical or ellipsoidal, so that the phenomenon that air is separated out when negative pressure occurs and large impact is generated on a hydraulic circuit is eliminated.
The application also discloses a control system applying the fluid control device in any one of the above aspects, the control system comprises a fluid medium source, a pumping unit and one or more actuating elements, each actuating element comprises a first medium inlet/outlet end and a second medium inlet/outlet end;
the fluid medium source is communicated with the fluid medium supply cavity on the valve body through the pumping unit to supply fluid to the valve body,
the flowing medium supply cavity is connected with a first medium inlet end and a first medium outlet end of at least one actuator, so that the flowing medium supply cavity can provide required fluid medium for the actuator connected with the flowing medium supply cavity;
the backflow medium cavity is connected with a second medium inlet end and a second medium outlet end of at least one actuating element, so that the backflow medium cavity can contain backflow fluid medium;
and a backflow medium discharge channel of the backflow medium containing cavity arranged on the valve body is communicated with a fluid medium source through the negative pressure generating device.
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 can perform control using a fluid medium as a medium, and includes, for example, a hydraulic control system, a pneumatic control system, and the like used in a construction machine.
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.
The fluid control device and the control system comprising the same have the following beneficial effects that:
1. the control valve can replace a multi-way valve of the existing control system, and can overcome many defects of the traditional multi-way valve; in addition, this application the control valve can be with fluid medium discretization, measurement segmentation, can realize control system's digitization, intellectuality, and then provides technical guarantee and technical basis for control system's intelligent control.
2. In order to eliminate hydraulic impact and pressure pulsation caused by discretization of fluid media, the flow supply medium cavity is designed to be an ellipsoidal cavity or a spherical cavity, a pipeline or an energy storage unit for supplying the fluid media by the pumping unit and a connection interface of the flow supply medium cavity are arranged at the sphere center of a sphere right opposite to the flow supply medium cavity or the focus of the ellipsoidal cavity, and therefore hydraulic impact caused by quick turn-off of the pumping unit or the flow supply on-off control switch of the valve body is improved, the flow supply medium cavity in the control valve can keep stable working pressure, and pulse flow of stable pressure can be quickly provided for a system.
3. By arranging the negative pressure generating device, the fluid medium in the backflow medium containing cavity can be sucked out under the suction action of the negative pressure generating device; in addition, the executive component (especially hydraulic cylinder) need extrude the fluid medium of one side from its inside under some operating modes, and this application passes through negative pressure generating device's effect can be taken fluid medium from the executive component is inside, and then can strengthen the anti-load ability of executive component effectively, then promote work efficiency, reduce the output work of power supply, play better energy-conserving effect.
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 structural diagram of a fluid control device according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of another fluid control device provided in an embodiment of the present application;
fig. 3 is a partially enlarged view of the structure at a of fig. 2.
Wherein the content of the first and second substances,
1 valve body, 11 flowing medium supply cavity, 12 backflow medium cavity, 13 flowing medium inlet channel, 14 flowing medium outlet channel, 15 backflow medium inlet channel, 16 backflow medium outlet channel, 17 flow on-off control switch, 171 first rotating body, 18 backflow on-off control switch, 181 second rotating body,
2 the driving motor is driven by the motor,
3 an energy storage unit, wherein the energy storage unit,
4 negative pressure generating device, 41 cylinder, 42 piston, 43 first cavity, 44 first medium inlet, 45 first medium outlet, 46 first switch unit, 47 second cavity, 48 second medium inlet, 49 second medium outlet, 50 third switch unit, 501 first one-way switch, 502 second one-way switch, 51 second switch unit,
5 a source of a fluid medium.
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 phrase "a flow medium supply cavity and a return medium cavity formed as the same flow path" means that the flow medium supply cavity and the return medium cavity both belong to the same fluid circuit, that is, the flow medium supply cavity and the return medium cavity are at least connected to the same actuator and are formed as the same fluid circuit.
In the present application, the number is included in a certain number or more, and two or more, for example.
A fluid control device as shown in fig. 1 comprises a control valve, the control valve comprises a valve body 1, a flow supply medium cavity 11 and a backflow medium cavity 12 are arranged inside the valve body 1, a flow supply medium inlet channel 13 and a flow supply medium outlet channel 14 which are communicated with the flow supply medium cavity 11 are arranged on the valve body 1, and a backflow medium inlet channel 15 and a backflow medium outlet channel 16 which are communicated with the backflow medium cavity 12 are arranged on the valve body 1;
the control valve also comprises a flow supply on-off control switch 17 and a backflow on-off control switch 18, wherein the flow supply on-off control switch 17 controls the opening and closing of the flow supply medium discharge channel 14, and the backflow on-off control switch 18 controls the opening and closing of the backflow medium inlet channel 15;
when the supply on-off control switch 17 is connected to the supply medium discharge passage 14, the backflow on-off control switch 18 is connected or disconnected to the backflow medium inlet passage 15, the supply medium cavity 11 provides fluid medium for the actuator, and the backflow medium cavity 12 receives the backflow fluid medium or provides space for expansion of gas in the fluid medium; the supply on-off control switch 17 and the return on-off control switch 18 are respectively driven by a driving unit;
the fluid control device also comprises a negative pressure generating device 4, and the backflow medium containing cavity 12 is connected with the negative pressure generating device 4; in a specific working process, when the negative pressure generating device 4 is in a working condition of forming negative pressure, the fluid in the backflow medium containing cavity 12 flows out, and when the negative pressure generating device 4 is in a working condition of forming positive pressure, the fluid in the backflow medium containing cavity 12 is blocked; when the negative pressure generating device 4 is in a non-working condition, the negative pressure generating device 4 serves as a passage for discharging the fluid medium in the backflow medium accommodating cavity 12. When the fluid control device is specifically applied to a control system, a fluid medium source 5 can be selectively communicated with the flow supply medium cavity 11 through a pumping unit and a flow supply medium inlet channel 13, the flow supply medium cavity 11 is communicated with one fluid medium inlet and outlet end of an actuating element through the flow supply medium outlet channel 14 and a reversing valve, the other fluid medium inlet and outlet end of the actuating element is communicated with a return medium cavity 12 through a reversing valve and a return medium inlet channel 15, and the return medium cavity 12 is directly or indirectly communicated with the fluid medium source 5 through a return medium outlet channel 16. It should be noted that, when the supply on-off control switch 17 is turned on the supply medium discharge passage 14, the backflow medium accommodating chamber 12 accommodates the backflow fluid medium under normal operating conditions, and under some special operating conditions, the backflow on-off control switch 18 in the same flow path is in an off state. As an alternative embodiment, in the present application, one of the flow medium supply containers 11 may be selectively coupled to one or more actuators (which may be selectively set as pneumatic actuators or hydraulic actuators, such as fluid motors, air cylinders, or hydraulic cylinders, for example), and the specific number may be selectively set according to the number of actuators set by the control system in which the fluid control device is located, such as the control valve is coupled to one, two, three, four, five, six, or more than seven actuators.
It should be noted that the negative pressure generating device is not limited in particular, and may be any device capable of generating negative pressure and promoting the fluid medium in the return medium chamber 12 to flow out from the return medium outlet passage 16. Which may be a vacuum pump, a driven cylinder-piston mechanism, etc.
As a changeable embodiment, the control valve can selectively provide more than two of the flow supply medium cavities 11 and more than one of the return medium cavities 12 on the valve body 1; in addition, in specific implementation, a control valve including a flow supply medium cavity 11 and a return medium cavity 12 can be selectively used as a control valve unit, and specifically, more than two control valve units can be combined together to be used as a multi-way valve of a control system according to actual needs; and the control system can be further selectively set as a hydraulic control system or a pneumatic system, and is preferably set as a control system using hydraulic oil as a fluid medium. The control valve is provided with control switches on a flow supply medium discharge channel 14 and a return medium inlet channel 15 respectively, and can independently control the opening and closing of the channels controlled by the control switches, so that the control valve can specifically provide fluid media according to the demand of an actuating element; meanwhile, a plurality of actuating elements of the control system comprising the control valve can be mutually independent, so that the problems of mutual coupling, mutual limitation and mutual influence existing among the actuating elements of the traditional control system can be avoided.
As a preferred example of the present embodiment, the negative pressure generating device is further selectively configured as a cylinder-piston mechanism, the cylinder-piston mechanism includes a cylinder 41 and a piston 42, in a specific implementation, the piston 42 and the cylinder 41 form a first cavity 43 with a variable volume, and the cylinder 41 is provided with a first medium inlet 44 and a first medium outlet 45 which are communicated with the first cavity 43;
the backflow medium cavity 12 is connected to the first medium inlet 44 through the backflow medium discharge channel 16, a first switch unit 46 for controlling the on-off of the backflow medium discharge channel is arranged on the backflow medium discharge channel 16, and a second switch unit 51 is arranged on the fluid channel at or downstream of the first medium outlet 45;
when the volume of the first receiving chamber 43 is increased, the first switching unit 46 on the return medium discharge passage 16 on the working flow path is in an open state, and the second switching unit 51 is in an off state, so that the fluid in the return medium receiving chamber 12 flows into the first receiving chamber 43;
when the volume of the first cavity 43 is reduced, the first switch unit 46 on the return medium discharge passage on the working flow path is in an off state, and the second switch unit 51 is in an on state, so that the fluid flowing into the first cavity 43 flows out to a specified position through the first medium outlet 45, and in a specific implementation, the fluid medium can be selectively extruded to the fluid medium source; in addition, the first switch unit 46 and the second switch unit 51 may be further selectively set as controlled valves or set as one-way valves opened in a set direction, when the negative pressure generating device does not operate, the first medium inlet 44 and the first medium outlet 45 are in a communication state, so that the first cavity 43 serves as a passageway for discharging the fluid medium in the backflow medium cavity 12, in a specific implementation, the first medium outlet 45 may be further communicated with a fluid medium source, and the second switch unit 51 is disposed on a fluid passage where the first medium outlet 45 is communicated with the fluid medium source.
In the specific implementation of the present application, two or more flow medium supply cavities 11 and at least one backflow medium cavity 12 may also be selectively arranged inside the valve body 1, and each flow medium supply cavity 11 and one or more backflow medium cavities 12 are adapted to each other and serve as components of the same flow path; each flow supply medium accommodating cavity 11 is respectively communicated with a flow supply medium inlet channel 13 arranged on the valve body 1 and at least one flow supply medium discharge channel 14 arranged on the valve body 1, and a flow supply on-off control switch 17 is arranged on each flow supply medium discharge channel 14; each backflow medium accommodating cavity 12 is respectively communicated with at least one backflow medium inlet channel 15 arranged on the valve body 1 and a backflow medium outlet channel 16 arranged on the valve body 1, and a backflow on-off control switch 18 is arranged on each backflow medium inlet channel 15; when the supply on-off control switch 17 is in an open state, the return on-off control switch 18 in the same flow path as the supply on-off control switch is in an open or closed state, the flow supply medium cavity 11 supplies fluid medium to the actuator, and the return medium cavity 12 receives the returned fluid medium or provides space for expansion of gas in the fluid medium; the supply on-off control switch 17 and the return on-off control switch 18 are driven by a driving unit; the backflow medium containing cavities 12 arranged on the valve body 1 are respectively connected with the negative pressure generating device 4, and when the negative pressure generating device 4 is in a working condition of forming negative pressure, fluid media in the backflow medium containing cavities 12 connected with the negative pressure generating device 4 flow out; when the negative pressure generating device 4 is in a working condition of forming positive pressure, the fluid in the backflow medium containing cavity 12 is blocked; when the negative pressure generating device 4 is in a non-working condition, the negative pressure generating device 4 serves as a passage for discharging fluid in the backflow medium cavity 12.
In practical applications, the control system often comprises a plurality of actuators, and for this purpose it is necessary to enable the fluid control device to be matched to a plurality of actuators simultaneously; the one-to-many function can be realized by enabling a group of flow supply medium accommodating cavities 11 and return medium accommodating cavities 12 in the same flow path; in addition, from the viewpoint of control strategy, it is also possible to selectively match the fluid control device with one or more actuators in a plurality of sets of the flow supply medium chamber 11 and the flow return medium chamber 12.
It is worth noting that, in the normal working process of the existing hydraulic cylinder, when the piston runs from the first side to the second side, the fluid medium inside the second side needs to be squeezed out, and a large loss is generated in the squeezing process, and the working condition is in a frequently-occurring state, so that a high requirement is provided for various performances (for example, requirements in power) of a power unit (an engine and the like), and a larger power unit is needed for matching, thereby increasing the investment cost of equipment; in addition, the power unit is frequently in such a condition, which also increases a great deal of energy consumption cost and equipment maintenance cost. This application is through setting up negative pressure generating device under negative pressure generating device's suction effect, can hold the fluid medium suction of intracavity with the backward flow medium, and then can strengthen the operating capability of executive component anti-load effectively, retrieve useless power, and then reduce power unit's output work, play better energy-conservation, consumption reduction, the effect of lowering costs.
As a preferred embodiment of the present application, when the embodiment that two or more flow medium supply cavities 11 and at least one return medium cavity 12 are provided inside the valve body 1 is implemented specifically, the negative pressure generating device may be further selectively configured as a cylinder piston mechanism, the cylinder piston mechanism includes a cylinder 41 and a piston 42, the piston 42 and the cylinder 41 form a first cavity 43 and a second cavity 47 with variable volumes, the cylinder 41 is provided with a first medium inlet 44 and a first medium outlet 45 communicating with the first cavity 43, and a second medium inlet 48 and a second medium outlet 49 communicating with the second cavity 47; each of a part of the backflow medium cavities 12 is respectively communicated with the first cavity 43 through a backflow medium discharge passage 16 and a first medium inlet 44, each of the remaining part of the backflow medium cavities 12 is respectively communicated with the second cavity 47 through the backflow medium discharge passage 16 and a second medium inlet 48, a first switch unit 46 is arranged on each backflow medium discharge passage 16, the backflow medium cavity 12 communicated with the first cavity 43 is communicated with at least one of the backflow medium cavities 12 communicated with the second cavity 47 through a third switch unit 50, and a second switch unit 51 is respectively arranged on the fluid passage at or downstream of the first medium outlet 45 and the fluid passage at or downstream of the second medium outlet 49; in a specific operation, when the volume of the first cavity 43 is increased, the first switch unit 46 on the return medium discharge passage 16 connected to the first cavity 43 in the working flow path is in an open state, and the second switch unit 51 connected to the first cavity 43 is in a closed state; when the volume of the first receiving chamber 43 is reduced, the first switching unit 46 on the return medium discharge passage 16, which is located on the working flow path and connected to the first receiving chamber 43, is in an off state, and the second switching unit 51 connected to the first receiving chamber 43 is in an on state; when the volume of the second cavity is increased, the first switch unit 46 on the return medium discharge passage 16, which is located on the working flow path and connected to the second cavity 47, is in an open state, and the second switch unit 51 connected to the second cavity 47 is in a closed state; when the volume of the second cavity 47 is reduced, the first switch unit 46 on the return medium discharge passage 16, which is located on the working flow path and connected to the second cavity 47, is in an off state, and the second switch unit 51 connected to the second cavity 47 is in an on state; when the differential pressure in the return medium chamber to which the third switching unit 50 is connected is equal to or lower than a set value, the third switching unit 50 is in an off state, and when the differential pressure in the return medium chamber to which the third switching unit 50 is connected is equal to or higher than the set value, the third switching unit 50 is in an on state. In specific operation of the foregoing embodiment, during the reciprocating motion of the piston 42, when the flow paths of the backflow medium cavities 12 communicated with the first cavity 43 are both in the non-operating state and the flow paths of at least part of the backflow medium cavities 12 communicated with the second cavity 47 are in the operating state, the third switch unit 50 communicated with the backflow medium cavity 12 whose flow path is in the operating state is in the open state, so that the backflow medium cavity 12 communicated with the second cavity 47 and whose flow path is in the operating state provides fluid medium for the first cavity 43, thereby avoiding the first cavity 43 from being vacuumized; when the flow paths of the backflow medium cavities 12 communicated with the second cavity 47 are all in a non-working state and at least part of the flow paths of the backflow medium cavities 12 communicated with the first cavity 43 are in a working state, the third switch unit 50 communicated with the backflow medium cavity 12 in the working state is in an open state, so that the backflow medium cavity 12 communicated with the first cavity 43 and in the working state provides fluid medium for the second cavity 47, and the second cavity 47 is prevented from being vacuumized. In addition, in a specific working process, when the fluid medium flowing into the return medium cavities is subjected to gas-liquid separation and expansion, and the pressure difference between the two return medium cavities is greater than the opening pressure of the third switch unit 50, the third switch unit 50 is in a connected state to release pressure energy, so that impact caused by gas-liquid separation is reduced, and the fluid control device can work more stably.
During the reciprocating motion of the piston 42, the cylinder piston mechanism can continuously suck the fluid medium in the backflow medium cavity 12, the flow path of which is in a working state, into the first cavity 43 and the second cavity 47; in practical implementation, the first switch unit 46 can be further selectively set as an electric control valve or a one-way valve, preferably a one-way valve; in a specific embodiment, the third switching unit 50 may be an electrically controlled valve. It should be noted that, in order to avoid confusion, the applicant defines the switch units disposed on the return medium discharge passage 16 as first switch units, the number of the first switch units 46 should be selectively matched according to the number of the return medium chambers 12 included in the fluid control device, and one first switch unit 46 may be selectively disposed on the return medium discharge passage 16 of each return medium chamber 12.
As a preferred embodiment of the present application, as shown in fig. 2, two flow supply medium cavities 11 and two return medium cavities 12 are further selectively provided on the valve body 1, wherein one flow supply medium cavity 11 is adapted to one return medium cavity 12 and serves as a component of the same flow path, and the other flow supply medium cavity 11 is adapted to the other return medium cavity 12 and serves as a component of the same flow path; each of the flow medium supply chambers 11 is communicated with at least one flow medium supply discharge passage 14 (the number of the flow medium supply discharge passages 14 depends on the number of the actuating elements and the specific design requirements of the applied control system), and each of the return medium supply chambers 12 is communicated with at least one return medium inlet passage 15 (the number of the flow medium supply discharge passages 14 depends on the number of the actuating elements and the specific design requirements of the applied control system); one of the return medium chambers 12 communicates with the first medium inlet 44 of the first chamber 43 via a first switch element 46, and the other return medium chamber 12 communicates with the first medium inlet 44 of the second chamber 47 via a further first switch element 46; the two backflow medium cavities 12 are communicated through the third switch unit 50; in specific operation, when the volume of the first cavity 43 is increased and the flow path of the reflux medium cavity 12 communicated with the first cavity is in an operating state, the fluid medium in the reflux medium cavity 12 communicated with the first cavity 43 flows into the first cavity 43 through the first switch unit 46 on the communication channel between the first cavity and the reflux medium cavity; when the volume of the second cavity 47 is increased and the flow path of the reflux medium cavity 12 communicated with the second cavity is in a working state, the fluid in the reflux medium cavity 12 communicated with the second cavity 47 flows into the second cavity 47 through the first switch unit 46 on the communication channel between the two cavities; when the flow paths of the reflux medium cavities 12 communicated with the first cavity 43 are all in a non-working state and the flow path of the reflux medium cavity 12 communicated with the second cavity 47 is in a working state, and the pressure difference between the reflux medium cavities connected to the third switch unit 50 is greater than a set opening pressure, the third switch unit 50 is in an open state, so that the reflux medium cavity 12 communicated with the second cavity 47 and in a working state provides fluid medium for the first cavity 43; when the flow path of the backflow medium containing cavity 12 communicated with the second containing cavity 47 is in a non-working state and the flow path of the backflow medium containing cavity 12 communicated with the first containing cavity 43 is in a working state, and the pressure difference between the backflow medium containing cavities connected to the third switch unit 50 is greater than a set opening pressure, the third switch unit 50 is in an open state, so that the backflow medium containing cavity 12 communicated with the first containing cavity 43 and in a working state provides fluid medium to the second containing cavity 47.
As a preferred embodiment of the present application, all the aforementioned embodiments, examples and their variations, examples of the present application can further selectively make the cylinder-piston mechanism driven by the reciprocating driving mechanism to make the piston 42 reciprocate in the cylinder 41, as shown in fig. 3, the third switching unit 50 includes a first one-way switch 501 and a second one-way switch 502 arranged in parallel, the turn-on direction of the first one-way switch 501 is set opposite to the turn-on direction of the second one-way switch 502, when the piston 42 reciprocates, the first one-way switch 501 and the second one-way switch 502 are selectively opened, so that during the reciprocating motion of the piston 42 of the cylinder piston mechanism, the first cavity 43 and the second cavity 47 can both obtain fluid medium from the return medium cavity 12 communicated with the first cavity; as an alternative embodiment, the present application may further selectively enable the cylinder-piston mechanism to be driven by a reciprocating driving mechanism to enable the piston 42 to reciprocate in the cylinder 41, and the third switch unit 50 is set as a controlled switch, and when the piston 42 reciprocates, the controlled switch is selectively opened, so that during the reciprocating motion of the piston 42 of the cylinder-piston mechanism, the first cavity 43 and the second cavity 47 can both take the fluid medium from the backflow medium cavity 12 communicated with them and can maintain the vacuum degree in the backflow medium cavity communicated with them within a set range. In specific implementation, the reciprocating driving mechanism is a driving mechanism comprising a gear and a rack, the gear is driven by a driving motor or a hydraulic motor and rotates in a reciprocating manner, and the rack is driven by the gear to move in a reciprocating manner; in specific implementation, when the reciprocating driving mechanism is limited by the vacuum degrees in the first containing cavity 43 and the second containing cavity 47, and the vacuum degrees in the first containing cavity 43 and the second containing cavity 47 are greater than a set value, the driving motor or the hydraulic motor of the reciprocating driving mechanism stops working.
As a preferred embodiment of the present application, all the aforementioned embodiments, examples and their changeable embodiments and examples of the present application can further selectively make the fluid control device work, the supply on-off control switch 17 makes the supply medium discharge channel 14 continuously in an on and off alternative working state, so that the control valve supplies pulsed fluid medium to the outside; as an alternative embodiment, it can also selectively make the fluid control device work, the supply on-off control switch 17 makes the supply medium discharge channel 14 continuously in an on and off alternative working state, so that the control valve supplies pulse fluid medium to the outside, and at the same time, the return on-off control switch 18 in the same flow path as the supply on-off control switch 17 makes the return medium inlet channel 15 continuously in an on and off alternative working state or in a continuously on state, so that the return medium chamber 12 receives the returned fluid medium. This application is through making supply to flow on-off control switch 17 is frequently in the state of opening or shutting down under the drive of drive unit, and then makes the control valve can provide pulsed fluid medium to the executive component, implements quantifiable, the supply of segmentation to fluid medium, like this alright with the discretization, the digitization that realize the fluid medium supply, make it combine together and then can be for using with electrical technology the fluid control system's of control valve intellectuality provides technical guarantee.
As a preferred embodiment of the present application, all the aforementioned embodiments, examples and their alternatives of the present application may further selectively set the driving unit as a driving motor 2, set the supply on-off control switch 17 as a first rotating body 171 having a first channel, wherein, in operation, the first rotating body 171 is driven by the driving motor 2 and rotates at a set rotation speed, and when the first rotating body 171 rotates within a set angle range, the first channel makes the supply medium discharge channel 14 controlled by the first channel in an on state;
the backflow on-off control switch 18 is a second rotating body 181 with a second channel, when the backflow on-off control switch works, the second rotating body 181 is driven by the driving motor 2 and rotates according to a set rotating speed, and when the second rotating body 181 rotates to a set angle range, the second channel enables the backflow medium controlled by the second rotating body to enter the channel 15 to be in a connected state;
the first rotating body 171 of the supply on-off control switch 17 and the second rotating body 181 of the return on-off control switch 18 which are in the same flow path are coaxially disposed and driven by the same driving motor. As an alternative embodiment, the first rotating body 171 of the supply/return on/off control switch 17 and the second rotating body 181 of the return on/off control switch 18 in the same flow path may be selectively provided in a non-interlocked manner and driven by different driving motors. In a specific implementation, the first rotating body 171 is further selectively configured as a rotating shaft, and the first channel is configured as a through hole penetrating through the rotating shaft. And further selectively setting the backflow on-off control switch 18 as a second rotating body 181 having a second channel, wherein, in operation, the second rotating body 181 is driven by the driving motor 2 and rotates at a set rotating speed, and when the second rotating body 181 rotates to a set angle range, the second channel makes the backflow medium inlet channel 15 controlled by the second rotating body in an on state, and in specific implementation, the second rotating body 181 is further selectively set as a rotating shaft, and the second channel is also set as a through hole penetrating through the rotating shaft. As an alternative embodiment, the first rotating body 171 of the supply/return on/off control switch 17 and the second rotating body 181 of the return on/off control switch 18 in the same flow path may be disposed coaxially and driven by the same driving motor 2; alternatively, the first rotating body 171 of the supply/return on/off control switch 17 and the second rotating body 181 of the return on/off control switch 18 in the same flow path are selectively provided so as not to be connected to each other, and are driven by different drive motors 2 (not shown).
As a preferred embodiment of the present application, all the aforementioned embodiments of the present application including the driving motor 2 may further selectively enable the driving motor 2 to be a servo motor, and the fluid control device further includes an electronic control unit, where the driving motor 2 is electrically connected to the electronic control unit to control the frequency of the flow supply on-off control switch 17 for connecting the flow supply medium discharge channel 14. As an alternative embodiment, the present application may also selectively set the driving motor 2 as a servo motor, and the fluid control device further includes an electronic control unit, and the driving motor 2 is electrically connected to the electronic control unit to control the frequency of the supply on-off control switch 17 for switching on the supply medium discharge passage 14 and the frequency of the return on-off control switch 18 for switching on the return medium intake passage 15. In an alternative embodiment, the driving motor 2 may be a stepping motor. In specific implementation, since the rotation speed and rotation angle of the driving motor 2 can be accurately controlled, the amount of the fluid medium supplied to the fluid medium supply chamber 11 can be indirectly and accurately measured and calculated, and the fluid medium can be accurately supplied to the actuator by combining the control unit, and the control intelligence can be further realized by discretizing and digitizing the supplied fluid medium.
As an embodiment of the present application, all the aforementioned embodiments of the present application may further selectively enable the fluid control device further include an energy storage unit 3, the energy storage unit 3 is connected to the flow supply medium cavity 11 so as to enable the flow supply medium cavity 11 to be in a set pressure range, the flow supply medium cavity 11 is communicated with the backflow medium cavity 12 in the same flow path as the flow supply medium cavity 11 through a one-way control switch having a set opening pressure, and when the pressure in the flow supply medium cavity 11 is greater than the set opening pressure, the flow supply medium cavity 11 and the backflow medium cavity 12 are in a connected state. As an alternative embodiment, it may also be possible to selectively couple the energy storage unit 3 to the flow medium supply cavity 11 so as to enable the flow medium supply cavity 11 to be in a set pressure range, where the flow medium supply cavity 11 and the return medium cavity 12 are communicated through an electromagnetic proportional relief valve with an adjustable opening pressure, and when the pressure in the flow medium supply cavity 11 is greater than the set opening pressure, the flow medium supply cavity 11 and the return medium cavity 12 are in a connected state. By arranging the energy storage unit 3, the flow supply medium accommodating cavity 11 can be in a set pressure range, so that a fluid loop is more stable in the working process; in addition, this application also can reach same technological effect through setting up the one-way control switch, when concrete implementation, the one-way control switch can selectively be set up to the check valve.
As a preferred embodiment of the present application, all the aforementioned embodiments and their convertible embodiments of the present application can be further selectively selected to make the flowing medium supply chamber 11 be an ellipsoidal chamber or a spherical chamber; and/or the return medium cavity 12 is selectively set as an ellipsoidal cavity or a spherical cavity. In specific implementation, when the flow medium supply cavity 11 is an ellipsoidal cavity, it is further preferable that a connection interface between the energy storage unit 3 and the flow medium supply cavity 11 is disposed at a valve body facing a focus of a central section ellipse of the flow medium supply cavity 11; when the flow medium supply cavity 11 is a spherical cavity, it is preferable that a connection interface between the energy storage unit 3 and the flow medium supply cavity 11 is disposed at a valve body facing a spherical center of the flow medium supply cavity 11. Further, the influence of hydraulic shock caused by rapid on-off of the supply on-off control switch 71 or hydraulic pulsation caused by a pumping unit on the system is reduced, so that the flow supply medium accommodating cavity 11 can maintain relatively stable working pressure, and the requirement of rapidly providing pulse flow with stable pressure is better met.
In specific implementation, a connection interface between a fluid connection pipeline between the pumping unit and the flow supply medium cavity 11 and the flow supply medium cavity can be further selectively arranged at a valve body which is opposite to a focus of a central section ellipse of the flow supply medium cavity 11; when the flow supply medium cavity 11 is a spherical cavity, a connection interface between the fluid connection pipeline between the pumping unit and the flow supply medium cavity 11 is arranged at a valve body facing the center of the sphere of the flow supply medium cavity. The influence of hydraulic impact caused by quick on-off of the supply on-off control switch 71 or hydraulic pulsation caused by the pumping unit on the system can be reduced, so that the supply medium cavity can keep stable working pressure, and the requirement of quickly providing pulse flow with stable pressure can be better met.
In specific implementation, the backflow medium accommodating cavity 12 can be further selectively set to be spherical or ellipsoidal, so as to eliminate the precipitation of air when negative pressure occurs and generate large impact on the hydraulic circuit.
For further clarity of the fluid control device disclosed in the present application, reference will now be made to a control system to which it is applied:
a control system applying a fluid control device comprises a fluid medium source, a pumping unit and one or more actuating elements, wherein each actuating element comprises a first medium inlet and a second medium outlet; a fluid medium source is communicated with a flow supply medium cavity 11 on the valve body 1 through a pumping unit to supply fluid to the flow supply medium cavity, and the flow supply medium cavity 11 is connected with a first medium inlet end and a first medium outlet end of at least one actuator, so that the flow supply medium cavity 11 can supply required fluid medium to the actuator connected with the flow supply medium cavity; the backflow medium cavity 12 is connected with a second medium inlet end and a second medium outlet end of at least one actuator, so that the backflow medium cavity 12 can receive backflow fluid medium; the backflow medium discharge passage 16 of the backflow medium accommodating cavity 12 arranged on the valve body 1 is communicated with a fluid medium source through the negative pressure generating device. As a changeable embodiment, in a specific implementation, the fluid control device of the control system may be further selectively provided with one, two, three, four, five or six or more of the flow supply medium cavities 11, and further selectively provided with one, two, three, four, five or six or more of the return medium cavities 12, and each actuator is connected with one of the flow supply medium cavities 11 and one of the return medium cavities 12 and forms the same number of working flow paths as the actuators, and preferably, the valve body is provided with the same number of flow supply medium discharge passages 14 as the actuators, and each actuator is connected with one of the flow supply medium discharge passages 14, so that the actuators can operate independently from each other and are not interfered by the other actuators. During specific work, the pumping unit pumps fluid medium from a fluid medium source to the fluid medium supply cavity 11, the fluid medium is supplied to the actuating element through the control of the supply on-off control switch 17 arranged on the fluid medium supply discharge channel 14, the fluid medium flowing out of the actuating element enters the backflow medium cavity 12 during the working process of the actuating element, and the fluid medium in the backflow medium cavity 12 can be sucked out to the fluid medium source for the next use under the action of the negative pressure generating device. In particular embodiments, the control system may optionally include one or more of the fluid medium sources. In a specific implementation, the control system is further selectively set as a control system of a construction machine (such as an excavator, a truck crane, and the like), and the actuator includes a telescopic cylinder and a hydraulic motor.
In the present application, the "working condition that the negative pressure generating device is in negative pressure formation" refers to a working condition that the fluid medium in the backflow medium containing cavity connected to the generating device is discharged from the backflow medium discharge passage, and for example, in the foregoing embodiment including the first containing cavity, when the volume of the first containing cavity is increased, the working condition that the fluid medium in the backflow medium containing cavity flows into the first containing cavity from the backflow medium discharge passage is a working condition that the negative pressure generating device is in negative pressure formation.
In this application, the "working condition that the negative pressure generating device is in the state of forming the positive pressure" refers to a working condition that the fluid medium in the backflow medium containing cavity connected to the generating device cannot be discharged from the backflow medium discharge passage, and for example, in the foregoing embodiment including the first containing cavity, when the volume of the first containing cavity is reduced, the working condition that the fluid medium in the backflow medium containing cavity cannot flow into the first containing cavity from the backflow medium discharge passage is a working condition that the negative pressure generating device is in the state of forming the positive pressure, that is, the working condition that the fluid in the backflow medium containing cavity is in the blocked state.
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 (10)

1. A fluid control device, characterized in that,
the control valve comprises a valve body, wherein a flow supply medium cavity and a backflow medium cavity are arranged in the valve body, a flow supply medium inlet channel and a flow supply medium outlet channel which are communicated with the flow supply medium cavity are arranged on the valve body, and a backflow medium inlet channel and a backflow medium outlet channel which are communicated with the backflow medium cavity are arranged on the valve body;
the control valve also comprises a flow supply on-off control switch and a backflow on-off control switch, the flow supply on-off control switch controls the opening and closing of the flow supply medium discharge channel, and the backflow on-off control switch controls the opening and closing of the backflow medium inlet channel;
the flow supply medium cavity provides fluid medium for the actuating element, and the backflow medium cavity receives backflow fluid medium;
the current supply on-off control switch and the backflow on-off control switch are driven by a driving unit;
the fluid control device also comprises a negative pressure generating device, the backflow medium containing cavity is connected with the negative pressure generating device, and when the negative pressure generating device is in a working condition of forming negative pressure, fluid in the backflow medium containing cavity flows out; when the negative pressure generating device is in a non-working condition, the negative pressure generating device is used as a passage for discharging fluid media in the backflow medium containing cavity.
2. The fluid control device according to claim 1,
the negative pressure generating device is a cylinder body piston mechanism, the cylinder body piston mechanism comprises a cylinder body and a piston, the piston and the cylinder body form a first accommodating cavity with variable volume, and a first medium inlet and a first medium outlet which are communicated with the first accommodating cavity are formed in the cylinder body; the backflow medium cavity is connected with the first medium inlet through the backflow medium discharge channel, a first switch unit for controlling the on-off of the backflow medium discharge channel is arranged on the backflow medium discharge channel, and a second switch unit is arranged on the first medium outlet or a fluid channel at the downstream of the first medium outlet;
when the volume of the first cavity is increased, the first switch unit on the backflow medium discharge channel on the working flow path is in an open state, and the second switch unit is in a closed state;
when the volume of the first cavity is reduced, the first switch unit on the return medium discharge passage on the working flow path is in an off state, and the second switch unit is in an on state.
3. A fluid control device, characterized in that,
the control valve comprises a valve body, wherein two or more flow supply medium cavities and at least one backflow medium cavity are arranged in the valve body, and each flow supply medium cavity is matched with one or more backflow medium cavities and is used as a component of the same flow path;
each flow supply medium accommodating cavity is respectively communicated with a flow supply medium inlet channel arranged on the valve body and at least one flow supply medium discharge channel arranged on the valve body, and a flow supply on-off control switch is arranged on each flow supply medium discharge channel;
each backflow medium containing cavity is respectively communicated with at least one backflow medium inlet channel arranged on the valve body and a backflow medium outlet channel arranged on the valve body, and a backflow on-off control switch is arranged on each backflow medium inlet channel;
the flow supply medium cavity provides fluid medium for the actuating element, and the backflow medium cavity receives backflow fluid medium; the current supply on-off control switch and the backflow on-off control switch are driven by a driving unit;
the fluid control device also comprises a negative pressure generating device, wherein a backflow medium containing cavity is connected with the negative pressure generating device, the backflow medium containing cavities arranged on the valve body are respectively connected with the negative pressure generating device, and when the negative pressure generating device is in a working condition of forming negative pressure, fluid in the backflow medium containing cavities flows out; when the negative pressure generating device is in a non-working condition, the negative pressure generating device is used as a passageway for discharging fluid in the backflow medium cavity.
4. The fluid control device according to claim 3,
the negative pressure generating device is a cylinder body piston mechanism, the cylinder body piston mechanism comprises a cylinder body and a piston, the piston and the cylinder body form a first containing cavity and a second containing cavity with variable volumes, and the cylinder body is provided with a first medium inlet and a first medium outlet which are communicated with the first containing cavity and a second medium inlet and a second medium outlet which are communicated with the second containing cavity;
each of a part of the backflow medium containing cavities is communicated with the first containing cavity through a backflow medium discharge passage and a first medium inlet, each of the other part of the backflow medium containing cavities is communicated with the second containing cavity through a backflow medium discharge passage and a second medium inlet, a first switch unit is arranged on each backflow medium discharge passage, and the backflow medium containing cavity communicated with the first containing cavity is communicated with at least one of the backflow medium containing cavities communicated with the second containing cavity through a third switch unit;
a second switching unit is respectively arranged on the first medium outlet or the fluid channel at the downstream of the first medium outlet and the second medium outlet or the fluid channel at the downstream of the second medium outlet;
when the volume of the first cavity is increased, a first switch unit which is positioned on a working flow path and is connected with the first cavity and on a backflow medium discharge passage is in an open state, and a second switch unit which is connected with the first cavity is in a closed state;
when the volume of the first cavity is reduced, a first switch unit which is positioned on a working flow path and is connected with the first cavity and on a backflow medium discharge passage is in a turn-off state, and a second switch unit which is connected with the first cavity is in a turn-on state;
when the volume of the second cavity is increased, a first switch unit which is positioned on a working flow path and is connected with the second cavity and on a backflow medium discharge passage is in an open state, and a second switch unit which is connected with the second cavity is in a closed state;
when the volume of the second cavity is reduced, a first switch unit which is positioned on a working flow path and is connected with the second cavity and on a backflow medium discharge passage is in a turn-off state, and a second switch unit which is connected with the second cavity is in a turn-on state;
when the pressure difference in the backflow medium containing cavity connected with the third switching unit is below a set value, the third switching unit is in an off state, and when the pressure difference in the backflow medium containing cavity connected with the third switching unit is above the set value, the third switching unit is in an on state.
5. The fluid control device according to claim 4,
the cylinder body piston mechanism is driven by the reciprocating driving mechanism to enable the piston to reciprocate in the cylinder body, the third switch unit comprises a first one-way switch and a second one-way switch which are arranged in parallel, the switching-on direction of the first one-way switch is opposite to the switching-on direction of the second one-way switch, and when the piston reciprocates, the first one-way switch and the second one-way switch are selectively opened, so that the first cavity and the second cavity can both obtain fluid media from a backflow medium cavity communicated with the first cavity and the second cavity in the reciprocating process of the piston of the cylinder body piston mechanism.
6. The fluid control device according to any one of claims 1 to 5,
the flow supply on-off control switch enables the flow supply medium discharge channel to be in an on-off alternative working state continuously, so that the control valve supplies pulse type fluid medium to the outside; alternatively, the first and second electrodes may be,
the flow supply on-off control switch enables the flow supply medium discharge channel to be in an on-off alternative working state continuously, so that the control valve supplies pulse type fluid medium to the outside, and meanwhile, the backflow on-off control switch which is in the same flow path with the flow supply on-off control switch enables the backflow medium entering channel to be in the on-off alternative working state continuously or in the on-off state continuously, so that the backflow medium accommodating cavity accommodates the backflow fluid medium.
7. The fluid control device according to claim 6,
the driving unit is a driving motor, the flow supply on-off control switch is a first rotating body with a first channel, the first rotating body is driven by the driving motor and rotates according to a set rotating speed, and when the first rotating body rotates to a set angle range, the first channel enables the flow supply medium discharge channel controlled by the first channel to be in a connection state;
the backflow on-off control switch is a second rotating body with a second channel, the second rotating body is driven by a driving motor and rotates according to a set rotating speed, and when the second rotating body rotates to a set angle range, the second channel enables the backflow medium controlled by the second rotating body to enter the channel to be in a connected state;
the first rotating body of the flow supply on-off control switch and the second rotating body of the backflow on-off control switch which are positioned in the same flow path are coaxially arranged and driven by the same driving motor, or the first rotating body of the flow supply on-off control switch and the second rotating body of the backflow on-off control switch which are positioned in the same flow path are arranged in a non-linkage way and driven by different driving motors.
8. The fluid control device according to claim 7,
the driving motor is set as a servo motor or a stepping motor, the fluid control device further comprises an electric control unit, and the driving motor is electrically connected with the electric control unit so as to control the frequency of the flow supply on-off control switch for switching on the flow supply medium discharge channel; alternatively, the first and second electrodes may be,
the fluid control device comprises a fluid control device, a driving motor and a backflow on-off control switch, wherein the driving motor is set as a servo motor or a stepping motor, the fluid control device further comprises an electric control unit, and the driving motor is electrically connected with the electric control unit so as to control the frequency of the backflow on-off control switch for switching on the backflow medium discharge channel and the frequency of the backflow on-off control switch for switching on the backflow medium inlet channel.
9. The fluid control device according to any one of claims 1 to 5,
the fluid control device also comprises an energy storage unit, the energy storage unit is connected with the flow supply medium cavity so that the flow supply medium cavity is in a set pressure range, the flow supply medium cavity is communicated with the backflow medium cavity in the same flow path through a one-way control switch with set opening pressure, and when the pressure in the flow supply medium cavity is greater than the set opening pressure, the flow supply medium cavity and the backflow medium cavity are in a connected state; alternatively, the first and second electrodes may be,
the fluid control device further comprises an energy storage unit, the energy storage unit is connected with the flow supply medium containing cavity to enable the flow supply medium containing cavity to be in a set pressure range, the flow supply medium containing cavity and the backflow medium containing cavity are communicated through an electromagnetic proportional overflow valve with adjustable opening pressure, and when the pressure in the flow supply medium containing cavity is larger than the set opening pressure, the flow supply medium containing cavity and the backflow medium containing cavity are in a communicated state.
10. A control system to which the fluid control device according to any one of claims 1 to 9 is applied,
the control system comprises a fluid medium source, a pumping unit and one or more actuating elements, wherein each actuating element comprises a first medium inlet and a second medium outlet;
the fluid medium source is communicated with the flow medium supply cavity on the valve body through the pumping unit to supply fluid to the flow medium supply cavity, and the flow medium supply cavity is connected with the first medium inlet and outlet end of at least one actuator, so that the flow medium supply cavity can supply required fluid medium to the actuator connected with the flow medium supply cavity;
the backflow medium cavity is connected with a second medium inlet end and a second medium outlet end of at least one actuating element, so that the backflow medium cavity can contain backflow fluid medium;
and a backflow medium discharge channel of the backflow medium containing cavity arranged on the valve body is communicated with a fluid medium source through the negative pressure generating device.
CN202022843374.3U 2020-11-30 2020-11-30 Fluid control device and control system comprising same Active CN214331035U (en)

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Application Number Priority Date Filing Date Title
CN202022843374.3U CN214331035U (en) 2020-11-30 2020-11-30 Fluid control device and control system comprising same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022843374.3U CN214331035U (en) 2020-11-30 2020-11-30 Fluid control device and control system comprising same

Publications (1)

Publication Number Publication Date
CN214331035U true CN214331035U (en) 2021-10-01

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Country Status (1)

Country Link
CN (1) CN214331035U (en)

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