CN108953266B - Balance valve opened in stages - Google Patents
Balance valve opened in stages Download PDFInfo
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- CN108953266B CN108953266B CN201810952003.3A CN201810952003A CN108953266B CN 108953266 B CN108953266 B CN 108953266B CN 201810952003 A CN201810952003 A CN 201810952003A CN 108953266 B CN108953266 B CN 108953266B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Pressure Circuits (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
A staged opening equalization valve according to an embodiment of the present invention includes: the valve comprises a valve body, an end plug, a pilot piston, a balance valve core, a first check ring, a first spring, a second spring seat, a one-way valve core and a third spring. According to the balance valve opened in stages, the pilot pressure can be reduced without affecting the stability.
Description
Technical Field
The invention relates to a valve component for a hydraulic device, in particular to a balance valve which is opened in stages.
Background
In modern mechanical equipment such as engineering machinery, construction machinery and the like, a large number of lifting hydraulic loops are applied, wherein a balance valve is a key hydraulic element for controlling the work of a hydraulic oil cylinder in the lifting loop, and the performance of the balance valve directly influences the performance of a main machine. Since the balancing valve mainly increases the back pressure and the set pressure is usually 30% -50% greater than the maximum load, the balancing valve is an energy consuming element in the system and is stabilized by the consumption of power. At present, the prior art is fixed with set pressure, generally 1.3-1.5 times of maximum load, when the load is reduced or no load, the back pressure is required to be as large as that when the load is fully loaded, so that the pilot pressure must be increased to open the set pressure, unnecessary useless power output is caused, and energy waste is caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
To this end, it is an object of the present invention to provide a balanced valve that is opened in stages, which allows reducing the magnitude of the pilot pressure without affecting the stability performance.
According to an embodiment of the invention, the balancing valve which is opened in stages comprises:
the valve body is provided with a valve body through hole which is communicated up and down, the valve body through hole is sequentially distributed from top to bottom and comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section, a fifth valve body through hole section, a sixth valve body through hole section and a seventh valve body through hole section, the aperture of the first valve body through hole section, the aperture of the second valve body through hole section, the aperture of the third valve body through hole section, the aperture of the fourth valve body through hole section and the aperture of the fifth valve body through hole section are sequentially reduced from top to bottom, the aperture of the sixth valve body through hole section and the aperture of the seventh valve body through hole section are all between the aperture of the third valve body through hole section and the aperture of the fourth valve body through hole section, the aperture of the sixth valve body through hole section is smaller than the aperture of the seventh valve body through hole section, a first flow passage for communicating the outer side wall of the valve body with the upper stepped surface of the second valve body through hole section is arranged on the valve body, and the upper stepped surface of the, The valve body comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section, a fifth valve body through hole section and a fifth valve body through hole section, wherein the first valve body through hole section is communicated with the upper step surface of the third valve body through hole section;
the end plug is arranged on the valve body to close the upper end of the valve body through hole, a sliding sleeve which extends downwards into the first valve body through hole section is arranged on the lower end face of the end plug, a sliding sleeve blind hole with a downward opening is arranged on the sliding sleeve, the aperture of the sliding sleeve blind hole is smaller than that of the fifth valve body through hole section, and the outer diameter of the sliding sleeve is between that of the fourth valve sleeve through hole section and that of the fifth valve body through hole section;
the pilot piston comprises a piston main body section which can be matched in the second valve body through hole section in a vertically sliding mode and a piston reducing section which can be matched in the third valve body through hole section in a vertically sliding mode, a vertically through piston through hole is formed in the pilot piston, the piston through hole comprises a first piston through hole section and a second piston through hole section from top to bottom, the second piston through hole section is adjacent to the lower end of the pilot piston, the aperture of the first piston through hole section is larger than that of the fourth valve body through hole section, and the aperture of the second piston through hole section is equal to that of the fourth valve body through hole section;
the balance valve core comprises a first sliding section, a connecting section, a second sliding section, a third sliding section and a fourth sliding section from top to bottom, the first sliding section can be matched in the sliding sleeve blind hole in a vertically sliding mode, the second sliding section can be matched in the first piston through hole section in a vertically sliding mode, the third sliding section can be matched in the second piston through hole section and the fourth valve body through hole section in a vertically sliding mode, the fourth sliding section can be matched in the fifth valve body through hole section in a vertically sliding mode, the outer diameter of the connecting section is smaller than the outer diameter of the first sliding section, the connecting section is used for connecting the first sliding section and the second sliding section, a balance valve core through hole which penetrates through vertically is formed in the balance valve core, and a third damping hole which is close to the lower end of the balance valve core through hole is formed in the balance valve core through hole;
the first check ring is fixedly arranged in the first piston through hole section, is positioned above the second sliding section in the first piston through hole section and is used for the connection section to pass through;
the first spring is arranged in the sliding sleeve blind hole, the upper end of the first spring abuts against the end plug, the lower end of the first spring abuts against the upper end of the first sliding section, the second spring is sleeved on the sliding sleeve, the upper end of the second spring abuts against the end plug, the lower end of the second spring abuts against the upper step face of the second valve sleeve through hole section, the inner diameter of the second spring is smaller than the aperture of the second valve sleeve through hole section, the outer diameter of the second spring is larger than the aperture of the second valve sleeve through hole section, the second spring normally pushes the pilot piston downwards to enable the lower end face of the pilot piston to abut against the upper step face of the fourth valve body through hole section, and the lower end face of the piston main body section and the upper step face of the third valve body through hole section are separated by a first preset distance to define a first control cavity, The upper end surface of the piston main body section is made to be level with the upper step surface of the second valve sleeve through hole section, the lower end surface of the first check ring is made to abut against the upper end surface of the second sliding section of the balance valve core, the first spring normally pushes the balance valve core downwards so that the lower end surface of the third sliding section and the upper step surface of the fifth valve body through hole section are separated by a third preset distance to define a second control cavity, and the lower end of the fourth sliding section downwards extends into the position below the lower step surface of the sixth valve body through hole section;
the second spring seat 7 is fixedly arranged in the seventh valve body through hole section;
the check valve core comprises a check valve core main body section which can be matched in the seventh valve body through hole section in a vertical sliding manner and a check valve core reducing section which is positioned below the check valve core main body section and can be matched in the second spring seat in a vertical sliding manner, a check valve core through hole which is communicated up and down is formed in the check valve core, the aperture of the check valve core through hole is smaller than that of the fifth valve body through hole section, and a third oil port is formed at the lower end of the check valve core through hole;
the third spring is sleeved on the reducing section of the one-way valve element, the upper end of the third spring abuts against the lower end face of the main body section of the one-way valve element, the lower end of the third spring abuts against the second spring seat, the third spring normally pushes the one-way valve element upwards to enable the upper end face of the one-way valve element to abut against the lower end face of the balance valve element so as to seal the first oil port, and at the moment, the upper end face of the main body section of the one-way valve element and the lower step face of the through hole section of the sixth valve body are separated by a second preset distance.
Advantageously, the balanced valve opened in stages further comprises a second retainer ring embedded in the seventh valve body through hole section to fix the second spring seat.
Advantageously, the coefficient of stiffness of the first spring is less than the coefficient of stiffness of the second spring.
Advantageously, when the balance valve core and the pilot piston both are subjected to external force and move upwards at least against the action of the first spring and the second spring so that the lower end face of the balance valve core is higher than the lower step face of the sixth valve body through hole section, the third spring pushes the one-way valve core upwards so that the upper end face of the one-way valve core abuts against the lower step face of the sixth valve body through hole section.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a balancing valve that is opened in stages according to one embodiment of the invention;
FIG. 2 is a hydraulic schematic of a balancing valve opening in stages according to one embodiment of the present invention;
FIG. 3 is a hydraulic schematic of one application scenario of a staged open balancing valve according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Hereinafter, a balance valve opened in stages according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, a balance valve opened in stages according to an embodiment of the present invention includes: the valve comprises a valve body 1, an end plug 2, a pilot piston 3, a balance valve core 4, a first check ring 5, a first spring 6a, a second spring 6b, a second spring seat 7, a one-way valve core 8 and a third spring 6 c.
Specifically, the valve body 1 has a valve body through hole penetrating vertically. The valve body through holes are sequentially distributed from top to bottom and comprise a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section, a fifth valve body through hole section, a sixth valve body through hole section and a seventh valve body through hole section, the aperture of the first valve body through hole section, the aperture of the second valve body through hole section, the aperture of the third valve body through hole section, the aperture of the fourth valve body through hole section and the aperture of the fifth valve body through hole section are sequentially reduced from top to bottom, the aperture of the sixth valve body through hole section and the aperture of the seventh valve body through hole section are all between the aperture of the third valve body through hole section and the aperture of the fourth valve body through hole section, and the aperture of the sixth valve body through hole section is smaller than the aperture of the seventh valve body through hole section. The valve body 1 is provided with a first flow passage 101 for communicating the outer side wall of the valve body 1 with the upper step surface of the second valve body through hole section, a second flow passage 102 for communicating the outer side wall of the valve body 1 with the upper step surface of the third valve body through hole section, a third flow passage 103 for communicating the outer side wall of the valve body 1 with the upper step surface of the fifth valve body through hole section, a fourth flow passage 104 for communicating the outer side wall of the valve body 1 with the sixth valve body through hole section, and a fifth flow passage 105 for communicating the fourth flow passage 104 with the sixth valve body through hole section. The second flow passage 102 has a first orifice 106 adjacent the upper stepped surface of the third valve body through bore section and the third flow passage 103 has a second orifice 107 adjacent the upper stepped surface of the fifth valve body through bore section. The outer opening of the first flow passage 101, the outer opening of the fourth flow passage 104, and the outer opening of the fifth flow passage 105 constitute a first port V, and the outer opening of the second flow passage 102 and the outer opening of the third flow passage 103 constitute a second port X.
The end plug 2 is arranged on the valve body 1 to seal the upper end of the valve body through hole, a sliding sleeve which extends downwards into the first valve body through hole section is arranged on the lower end face of the end plug 2, a sliding sleeve blind hole with a downward opening is arranged on the sliding sleeve, the aperture of the sliding sleeve blind hole is smaller than that of the fifth valve body through hole section, and the outer diameter of the sliding sleeve is between that of the fourth valve sleeve through hole section and that of the fifth valve body through hole section.
The pilot piston 3 comprises a piston main body section which can be matched in the second valve body through hole section in a vertically sliding mode and a piston reducing section which can be matched in the third valve body through hole section in a vertically sliding mode, a vertically through piston through hole is formed in the pilot piston 3, the piston through hole comprises a first piston through hole section and a second piston through hole section from top to bottom, the second piston through hole section is adjacent to the lower end of the pilot piston 3, the aperture of the first piston through hole section is larger than that of the fourth valve body through hole section, and the aperture of the second piston through hole section is equal to that of the fourth valve body through hole section.
The balance valve core 4 comprises a first sliding section, a connecting section, a second sliding section, a third sliding section and a fourth sliding section from top to bottom, the first sliding section can be matched in the sliding sleeve blind hole in a vertical sliding mode, the second sliding section can be matched in the first piston through hole section in a vertical sliding mode, the third sliding section can be matched in the second piston through hole section and the fourth valve body through hole section in a vertical sliding mode, the fourth sliding section can be matched in the fifth valve body through hole section in a vertical sliding mode, the outer diameter of the connecting section is smaller than the outer diameter of the first sliding section, and the connecting section is used for connecting the first sliding section and the second sliding section. The balance valve core 4 is provided with a balance valve core through hole 401 which penetrates up and down, and the balance valve core through hole 401 is provided with a third damping hole 402 which is adjacent to the lower end of the balance valve core through hole 401.
The first retainer ring 5 is fixedly arranged in the first piston through hole section, and the first retainer ring 5 is positioned on the second sliding section in the first piston through hole section and is used for the connecting section to pass through.
The first spring 6a is arranged in the sliding sleeve blind hole, the upper end of the first spring 6a abuts against the end plug 2, and the lower end of the first spring 6a abuts against the upper end of the first sliding section. The second spring 6b is sleeved on the sliding sleeve, the upper end of the second spring 6b abuts against the end plug 2, the lower end of the second spring 6b abuts against the upper step surface of the second valve sleeve through hole section, the inner diameter of the second spring 6b is smaller than the aperture of the second valve sleeve through hole section, and the outer diameter of the second spring 6b is larger than the aperture of the second valve sleeve through hole section. The second spring 6b normally pushes the pilot piston 3 downwards to enable the lower end face of the pilot piston 3 to abut against the upper step face of the fourth valve body through hole section, the lower end face of the piston main body section and the upper step face of the third valve body through hole section are separated by a first preset distance to limit a first control cavity 1a, the upper end face of the piston main body section and the upper step face of the second valve sleeve through hole section are made to be flat, and the lower end face of the first retainer ring 5 abuts against the upper end face of the second sliding section of the balance valve core 4. The first spring 6a normally pushes the balance valve core 4 downwards to enable the lower end face of the third sliding section to be spaced from the upper step face of the through hole section of the fifth valve body by a third preset distance to limit a second control cavity 1b, and the lower end of the fourth sliding section downwards extends into the position below the lower step face of the through hole section of the sixth valve body.
And a second spring seat 7 is fixedly arranged in the seventh valve body through hole section. Advantageously, the balanced valve opened in stages further comprises a second retainer ring 9, and the second retainer ring 9 is embedded in the seventh valve body through hole section to fix the second spring seat 7.
The check valve element 8 includes a check valve element main body section which is fitted in the seventh valve body through hole section in a vertically slidable manner, and a check valve element reduced diameter section which is located below the check valve element main body section and is fitted in the second spring seat 7 in a vertically slidable manner. The check valve core 8 is provided with a check valve core through hole 801 which is vertically communicated, the aperture of the check valve core through hole 801 is smaller than that of the fifth valve body through hole section, and the lower end of the check valve core through hole 801 forms a third oil port C.
The third spring 6c is sleeved on the reducing section of the one-way valve core, the upper end of the third spring 6c abuts against the lower end face of the main body section of the one-way valve core, the lower end of the third spring 6c abuts against the second spring seat 7, and the third spring 6c normally pushes the one-way valve core 8 upwards to enable the upper end face of the one-way valve core 8 to abut against the lower end face of the balance valve core 4 so as to seal the first oil port V. At this time, the upper end surface of the check valve core main body section and the lower step surface of the sixth valve body through hole section are spaced by a second predetermined distance.
According to one example of the present invention, the coefficient of stiffness of the first spring 6a is smaller than the coefficient of stiffness of the second spring 6 b.
Advantageously, when both the balance spool 4 and the pilot piston 3 are forced by an external force to move upwards at least against the action of the first spring 6a and the second spring 6b so that the lower end face of the balance spool 4 is higher than the lower step face of the sixth valve body through hole section, the third spring 6c pushes the check spool 8 upwards so that the upper end face of the check spool 8 abuts against the lower step face of the sixth valve body through hole section.
The operation of the balancing valve opened in stages according to the embodiment of the present invention will be briefly described.
As shown in fig. 3, the first port V is connected to the working port a of the directional control valve 13, the third port C is connected to the rodless chamber of the hydraulic cylinder 14, and the second port X and the rod chamber of the hydraulic cylinder 14 are both connected to the working port B of the directional control valve 13.
The operation principle of the balance valve opened in stages according to the embodiment of the present invention is divided into three processes of ascending, stopping and descending.
(1) In the ascending process, the pressure oil of the reversing valve 13 reaches the first port V of the balance valve, the pressure oil of the first port V pushes the check valve core 8 to move downwards to overcome the acting force of the third spring 6C to open the valve port, and the oil flows into the third port C through the first port V to reach the rodless cavity of the hydraulic cylinder 14, so as to push the hydraulic cylinder 14 to move upwards.
(2) In the descending process, the reversing valve 13 reverses, the pressure oil of the second oil port X acts on the balance valve core 4 and the pilot piston 3, the balance valve core 4 is controlled to move upwards in two stages according to the pressure of the second oil port X, the valve port between the first oil port V and the third oil port C is opened, and the load descends in the control process.
When the load is required to be controlled to descend, namely when oil flows into the first oil port V from the third oil port C, the motion of the balance valve core 4 and the pilot piston 3 is divided into two stages, specifically as follows:
the first stage is as follows: and oil is fed from the second oil port X, if the pressure of the second oil port X is lower, the oil enters the second control cavity 1b from the second oil port X through the second damping hole 107 and acts on the balance valve core 4 to push the balance valve core 4 to drive the pilot piston 3 to overcome the common acting force of the first spring 6a and the second spring 6b to move upwards through the first check ring 5, so that the valve port of the balance valve core 4 is opened, the oil of the third oil port C flows into the first oil port V, and the load begins to descend. In the first stage movement process, because the pressure of the second port X is low, the pressure oil of the second port X enters the first control chamber 1a from the first damping hole 106 and acts on the pilot piston 3, and cannot overcome the acting force of the second spring 6 b.
And a second stage: the pressure value of the second oil port X is continuously increased, the pressure of the second oil port X acts on the pilot piston 3 after passing through the first damping hole 106, the force generated by the pressure acting on the pilot piston 3 at this time can overcome the acting force of the second spring 6b, the pilot piston 3 moves upwards, the upper step surface of the second piston through hole section of the pilot piston 3 is in contact with the lower end surface of the second sliding section of the balance valve core 4, and the pressure of the second oil port X acts on the pilot piston 3 and the balance valve core 4 to overcome the acting forces of the first spring 6a and the second spring 6b together. At this stage, the influence rate of the increase of the X pressure value of the second port on the displacement of the balance valve element 4 becomes larger. The advantage of this is that to the operating mode that third hydraulic fluid port C load is less, for example when being used for the hoist engine control, no load on the hoist engine couple is the weight of couple self only, is equivalent to unloaded, does not also involve the problem of load motion stability when the hoist engine is unloaded, consequently can make the influence rate increase of second hydraulic fluid port X pressure to balanced case 4 displacement volume, can reduce the pressure of second hydraulic fluid port X like this for prior art, produces energy-conserving effect.
Taking the increase of the displacement of the balanced valve core 4 caused by the increase of the pressure of the second port X by 0.5MPA each time as an example, the influence rate of the pressure of the second port X on the displacement of the balanced valve core 8 will be described. For example: in the first stage, when the pressure of the second oil port X is increased by 0.5MPA, the displacement of the balance valve core 4 is increased by 0.2 mm; in the second stage, the displacement of the balance valve core 8 is increased by 0.5mm when the pressure of the second oil port X is increased by 0.5 MPA. In the prior art, the influence rate of the pressure of the second oil port X on the displacement of the balance valve core 4 is fixed.
(3) And in the stopping process, the pressure of the second oil port X is reduced, the balance valve core 4 is pushed to move downwards under the action of the first spring 6a and the second spring 6b, the valve port is closed, and the first oil port V and the third oil port C are closed and are not communicated.
According to the above description, the invention has the advantages that: compared with the prior art, the invention can reduce the pilot pressure of the second oil port X on the premise of not influencing the load stability control, and the starting pressure when the load is small or the control is far less than that of the prior art, thereby having great energy-saving effect.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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 invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, 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 an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although the embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments without departing from the scope of the present invention.
Claims (4)
1. A balanced valve that opens in stages, comprising:
the valve body is provided with a valve body through hole which is communicated up and down, the valve body through hole is sequentially distributed from top to bottom and comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section, a fifth valve body through hole section, a sixth valve body through hole section and a seventh valve body through hole section, the aperture of the first valve body through hole section, the aperture of the second valve body through hole section, the aperture of the third valve body through hole section, the aperture of the fourth valve body through hole section and the aperture of the fifth valve body through hole section are sequentially reduced from top to bottom, the aperture of the sixth valve body through hole section and the aperture of the seventh valve body through hole section are all between the aperture of the third valve body through hole section and the aperture of the fourth valve body through hole section, the aperture of the sixth valve body through hole section is smaller than the aperture of the seventh valve body through hole section, a first flow passage for communicating the outer side wall of the valve body with the upper stepped surface of the second valve body through hole section is arranged on the valve body, and the upper stepped surface of the, The valve body comprises a first valve body through hole section, a second valve body through hole section, a third valve body through hole section, a fourth valve body through hole section, a fifth valve body through hole section and a fifth valve body through hole section, wherein the first valve body through hole section is communicated with the upper step surface of the third valve body through hole section;
the end plug is arranged on the valve body to close the upper end of the valve body through hole, a sliding sleeve which extends downwards into the first valve body through hole section is arranged on the lower end face of the end plug, a sliding sleeve blind hole with a downward opening is arranged on the sliding sleeve, the aperture of the sliding sleeve blind hole is smaller than that of the fifth valve body through hole section, and the outer diameter of the sliding sleeve is between that of the fourth valve sleeve through hole section and that of the fifth valve body through hole section;
the pilot piston comprises a piston main body section which can be matched in the second valve body through hole section in a vertically sliding mode and a piston reducing section which can be matched in the third valve body through hole section in a vertically sliding mode, a vertically through piston through hole is formed in the pilot piston, the piston through hole comprises a first piston through hole section and a second piston through hole section from top to bottom, the second piston through hole section is adjacent to the lower end of the pilot piston, the aperture of the first piston through hole section is larger than that of the fourth valve body through hole section, and the aperture of the second piston through hole section is equal to that of the fourth valve body through hole section;
the balance valve core comprises a first sliding section, a connecting section, a second sliding section, a third sliding section and a fourth sliding section from top to bottom, the first sliding section can be matched in the sliding sleeve blind hole in a vertically sliding mode, the second sliding section can be matched in the first piston through hole section in a vertically sliding mode, the third sliding section can be matched in the second piston through hole section and the fourth valve body through hole section in a vertically sliding mode, the fourth sliding section can be matched in the fifth valve body through hole section in a vertically sliding mode, the outer diameter of the connecting section is smaller than the outer diameter of the first sliding section, the connecting section is used for connecting the first sliding section and the second sliding section, a balance valve core through hole which penetrates through vertically is formed in the balance valve core, and a third damping hole which is close to the lower end of the balance valve core through hole is formed in the balance valve core through hole;
the first check ring is fixedly arranged in the first piston through hole section, is positioned above the second sliding section in the first piston through hole section and is used for the connection section to pass through;
the first spring is arranged in the sliding sleeve blind hole, the upper end of the first spring abuts against the end plug, the lower end of the first spring abuts against the upper end of the first sliding section, the second spring is sleeved on the sliding sleeve, the upper end of the second spring abuts against the end plug, the lower end of the second spring abuts against the upper step face of the second valve sleeve through hole section, the inner diameter of the second spring is smaller than the aperture of the second valve sleeve through hole section, the outer diameter of the second spring is larger than the aperture of the second valve sleeve through hole section, the second spring normally pushes the pilot piston downwards to enable the lower end face of the pilot piston to abut against the upper step face of the fourth valve body through hole section, and the lower end face of the piston main body section and the upper step face of the third valve body through hole section are separated by a first preset distance to define a first control cavity, The upper end surface of the piston main body section is made to be level with the upper step surface of the second valve sleeve through hole section, the lower end surface of the first check ring is made to abut against the upper end surface of the second sliding section of the balance valve core, and the first spring normally pushes the balance valve core downwards so that the lower end surface of the third sliding section and the upper step surface of the fifth valve body through hole section are separated by a third preset distance to define a second control cavity and the lower end of the fourth sliding section downwards extends into the position below the lower step surface of the sixth valve body through hole section;
the second spring seat is fixedly arranged in the seventh valve body through hole section;
the check valve core comprises a check valve core main body section which can be matched in the seventh valve body through hole section in a vertical sliding manner and a check valve core reducing section which is positioned below the check valve core main body section and can be matched in the second spring seat in a vertical sliding manner, a check valve core through hole which is communicated up and down is formed in the check valve core, the aperture of the check valve core through hole is smaller than that of the fifth valve body through hole section, and a third oil port is formed at the lower end of the check valve core through hole;
the third spring is sleeved on the reducing section of the one-way valve element, the upper end of the third spring abuts against the lower end face of the main body section of the one-way valve element, the lower end of the third spring abuts against the second spring seat, the third spring normally pushes the one-way valve element upwards to enable the upper end face of the one-way valve element to abut against the lower end face of the balance valve element so as to seal the first oil port, and at the moment, the upper end face of the main body section of the one-way valve element and the lower step face of the through hole section of the sixth valve body are separated by a second preset distance.
2. The staged opening trim valve of claim 1, further comprising a second retainer ring embedded within the seventh valve body through bore section to secure the second spring seat.
3. The balanced valve opened in stages according to claim 1, characterized in that the coefficient of stiffness of the first spring is smaller than the coefficient of stiffness of the second spring.
4. The staged opening balanced valve as recited in claim 1, wherein when both the balanced spool and the pilot piston are forced upward by an external force against at least the first and second springs to raise the lower end surface of the balanced spool above the lower step surface of the sixth valve body through-hole section, the third spring pushes the check spool upward to bring the upper end surface of the check spool against the lower step surface of the sixth valve body through-hole section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952003.3A CN108953266B (en) | 2018-08-21 | 2018-08-21 | Balance valve opened in stages |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952003.3A CN108953266B (en) | 2018-08-21 | 2018-08-21 | Balance valve opened in stages |
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| CN108953266A CN108953266A (en) | 2018-12-07 |
| CN108953266B true CN108953266B (en) | 2020-06-19 |
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| CN201810952003.3A Active CN108953266B (en) | 2018-08-21 | 2018-08-21 | Balance valve opened in stages |
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| CN110230615B (en) * | 2019-04-29 | 2020-10-30 | 裕泰液压技术(上海)有限公司 | Plug-in type time-delay overflow valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3980095A (en) * | 1975-02-10 | 1976-09-14 | Mcavoy Dennis J | Power transmission |
| CN101634317B (en) * | 2009-08-21 | 2011-12-28 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN101865171A (en) * | 2010-07-02 | 2010-10-20 | 镇江大力液压马达有限责任公司 | Thread cartridge balanced valve |
| CN102996556A (en) * | 2012-12-04 | 2013-03-27 | 怀特(中国)驱动产品有限公司 | Direct-acting type hydraulic threaded cartridge balanced valve |
| DE102015001755A1 (en) * | 2015-02-11 | 2016-08-11 | Hydac Fluidtechnik Gmbh | Pressure relief valve |
| CN105221509B (en) * | 2015-11-02 | 2017-03-22 | 宁波江北宇洲液压设备厂 | Balance valve to open in phases |
| CN106015152B (en) * | 2016-07-19 | 2017-11-10 | 盐城海特机械科技有限公司 | Slowly the flow type balanced valve closed is changed up |
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