CN114962708A - Multistage flow control valve and hydraulic excavator carrying same - Google Patents
Multistage flow control valve and hydraulic excavator carrying same Download PDFInfo
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- CN114962708A CN114962708A CN202210753989.8A CN202210753989A CN114962708A CN 114962708 A CN114962708 A CN 114962708A CN 202210753989 A CN202210753989 A CN 202210753989A CN 114962708 A CN114962708 A CN 114962708A
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- regulating valve
- oil duct
- valve
- cavity
- valve core
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0716—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides with fluid passages through the valve member
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2267—Valves or distributors
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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
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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
- F15B13/024—Pressure relief valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a multistage flow regulating valve and a hydraulic excavator carrying the same. The multi-stage flow regulating valve comprises a regulating valve sleeve, the right end of the regulating valve sleeve is connected with a regulating valve shell, and the right end of the regulating valve shell is connected with a regulating valve rear cover; the regulating valve sleeve and the regulating valve shell are arranged in a valve core hole of the valve body; a regulating valve core is arranged in the regulating valve sleeve in a matching way, a spring seat is arranged in the regulating valve shell in a matching way, and a spring is arranged in the regulating valve rear cover; the left end of the spring seat is matched with the valve core of the regulating valve, and the right end of the spring seat is contacted with the left end of the spring. According to the invention, the regulation of the flow of the pump port is effectively realized through the primary throttling, the unloading of the flow of the pump port is effectively realized through the secondary throttling, and the risks of part damage and oil leakage caused by the pressure build-up of the P port due to mechanical failure or other problems of a hydraulic system are avoided.
Description
Technical Field
The invention relates to the technical field of hydraulic control systems, in particular to a multi-stage flow regulating valve and a hydraulic excavator carrying the same.
Background
Along with the rapid development of engineering machinery, the requirements on the quality and the performance of parts of the engineering machinery are higher and higher, and especially along with the improvement of environmental awareness in recent years, higher requirements on the oil leakage and the safety of the engineering machinery are provided; the chip type load sensitive multi-way valve and the load sensitive pump applied to the micro-digger and the small digger are both under the load action of the actuating mechanism, the flow and the pressure of the chip type load sensitive multi-way valve and the load sensitive pump change along with the change of the load pressure, when the load pressure is out of control due to mechanical failure, the pressure and the flow of a hydraulic system are out of control, the unloading function of the hydraulic system is failed at the moment, the function of a hydraulic pump or a hydraulic valve is further failed, and the damage and the oil injection of the hydraulic pump and the hydraulic valve parts are seriously caused.
Chinese patent discloses an unloading valve and a combined valve type buffer oil cylinder (CN 114439807A) for realizing flow unloading and improving the safety of a system. The unloading valve comprises a valve body, a valve core and a return spring, and is also provided with a damping hole and an unloading groove; the combined valve comprises an unloading valve and a throttle valve, and the throttle valve comprises a buffer plug and a buffer cavity; a piston rod assembly of the combination valve type buffer oil cylinder is arranged in the cylinder body, the cylinder body comprises a cylinder head flange, a cylinder bottom and a cylinder barrel, and the piston rod assembly comprises a guide sleeve, a piston and a piston rod; the combination valve is arranged on the oil cylinder.
The technology has the following defects: the unloading valve has the advantages of single function, no flow regulation function, low function integration level and limitation of application range.
Disclosure of Invention
In order to solve the above-described problems, the present invention provides a multistage flow control valve and a hydraulic excavator equipped with the same. The multistage flow regulating valve can realize regulation of system flow during working of the hydraulic excavator of the engineering machinery, and meanwhile avoids the risk of inter-chip leakage or oil injection caused by overlarge pressure of a hydraulic system.
The invention is realized by the following technical scheme: a multi-stage flow control valve, which comprises a valve body,
the valve comprises a regulating valve sleeve, wherein the right end of the regulating valve sleeve is connected with a regulating valve shell, and the right end of the regulating valve shell is connected with a regulating valve rear cover; the regulating valve sleeve and the regulating valve shell are arranged in a valve core hole of the valve body; a regulating valve core is arranged in the regulating valve sleeve in a matching way, a spring seat is arranged in the regulating valve shell in a matching way, and a spring is arranged in the regulating valve rear cover; the left end of the spring seat is matched with the valve core of the regulating valve, and the right end of the spring seat is contacted with the left end of the spring;
the valve body is provided with a Dr oil duct, a P oil duct, a T oil duct and a Ls oil duct;
a K oil duct which is in a directional pair with the Dr oil duct, a Q oil duct which is in a directional pair with the P oil duct and an E oil duct which is in a directional pair with the T oil duct are formed in the regulating valve sleeve;
the left end of the valve core of the regulating valve is provided with an N containing cavity which is communicated with an L oil duct, an M oil duct and a K oil duct which are arranged on a valve sleeve of the regulating valve; an F containing cavity matched with the Q oil duct and the E oil duct is formed in the outer surface of the middle of the valve core of the regulating valve; the outer surface of the valve core of the regulating valve on the left side of the cavity F is provided with a cavity J, the cavity J is communicated with the cavity F, and the outer diameter of the valve core of the regulating valve on the left side of the cavity J is smaller than that of the valve core of the regulating valve on the right side of the cavity J;
the regulating valve shell is provided with an oil duct A which is opposite to the Ls oil duct, the right end of the valve core of the regulating valve is a cavity B, and the oil duct A is communicated with the cavity B;
the left end of the spring seat is in clearance sliding fit with the right end of the valve core of the regulating valve, the axis of the spring seat is provided with a C oil duct, and the right end of the spring seat is provided with a D containing cavity.
It further comprises the following steps: and the regulating valve sleeve is provided with a throttling hole I and a throttling hole II which are opposite to the Dr oil passage, the diameter of the throttling hole I is smaller than that of the throttling hole II, and the throttling hole I is positioned on the left side of the throttling hole II.
The valve core of the regulating valve is provided with a radial G oil duct and an I oil duct, the G oil duct is communicated with the F containing cavity, and the I oil duct is communicated with the J containing cavity; the left end of the valve core of the adjusting valve is provided with an H oil duct, the H oil duct is communicated with a G oil duct and an I oil duct, and the left end of the H oil duct is provided with a plug.
The right end of the valve core of the regulating valve is provided with a shoulder which is abutted against the right end of the valve sleeve of the regulating valve; the inner wall of the regulating valve shell is provided with a baffle table used for limiting the rightward displacement of the valve core shoulder of the regulating valve.
The spring seat is provided with a shoulder which is propped against the right end of the blocking table of the regulating valve shell.
A steel wire check ring and an O-shaped sealing ring II are arranged between the left end of the regulating valve shell and the regulating valve sleeve, an O-shaped sealing ring I is arranged between the right end of the regulating valve shell and the regulating valve rear cover, and an O-shaped sealing ring III is arranged between the outer surface of the regulating valve shell and a valve core hole of the valve body.
An O-shaped sealing ring IV, an O-shaped sealing ring V and an O-shaped sealing ring VI are arranged between the outer surface of the valve sleeve of the regulating valve and a valve core hole of the valve body; the O-shaped sealing ring IV is positioned between the Q oil duct and the E oil duct; the O-shaped sealing ring V is positioned between the Dr oil duct and the Q oil duct; and the O-shaped sealing ring VI is positioned on the left side of the Dr oil duct.
A hydraulic excavator adopts a multi-stage flow regulating valve.
Compared with the prior art, the invention has the beneficial effects that:
the adjustment or unloading of the outlet flow of the pump is realized by making full use of the force difference of the valve core of the flow adjusting valve and the matching displacement difference of the valve core and the valve sleeve of the flow adjusting valve; the regulation of the flow of the pump port is effectively realized through the first-stage throttling, the unloading of the flow of the pump port is effectively realized through the second-stage throttling, and the risks of part damage and oil leakage caused by the pressure build-up of the P port due to mechanical failure or other problems of a hydraulic system are avoided;
the flow regulation and system oil unloading are organically unified, and the regulating valve is simple in structure, powerful in function, compact in structure and high in integration level.
Drawings
FIG. 1 is a schematic structural view of a multi-stage flow control valve of the present invention;
FIG. 2 is a schematic view of the installation of the multi-stage flow control valve of the present invention;
FIG. 3 is an enlarged view of the left end position of the valve spool of the regulator valve of FIG. 2;
FIG. 4 is a schematic diagram of the structure of the valve core of the regulator valve of the present invention;
FIG. 5 is a schematic structural view of a valve sleeve of the regulator valve of the present invention;
in the figure: the adjustable valve comprises a regulating valve shell 1, a spring seat 2, a regulating valve rear cover 3, an O-shaped sealing ring I4, a spring 5, a regulating valve sleeve 6, a throttling hole I6-1, a throttling hole II 6-2, a regulating valve spool 7, a steel wire check ring 8, an O-shaped sealing ring II 9, an O-shaped sealing ring III 10, an O-shaped sealing ring IV 11, an O-shaped sealing ring V12, an O-shaped sealing ring VI 13 and a plug 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 to 3, a multi-stage flow control valve comprises a control valve housing 6, wherein the right end of the control valve housing 6 is connected with a control valve housing 1, and the right end of the control valve housing 1 is connected with a control valve rear cover 3. The regulator valve sleeve 6 and the regulator valve housing 1 are mounted in the valve core hole of the valve body. The adjusting valve spool 7 is installed in the adjusting valve sleeve 6 in a matched mode, the spring seat 2 is installed in the adjusting valve sleeve 1 in a matched mode, the spring 5 is installed in the adjusting valve rear cover 3, the left end of the spring seat 2 is matched with the adjusting valve spool 7, and the right end of the spring seat 2 is in contact with the left end of the spring 5. The right end of the valve core 7 of the regulating valve is provided with a shoulder, and the shoulder of the valve core 7 of the regulating valve is abutted against the right end of the valve sleeve 6 of the regulating valve; the inner wall of the regulating valve shell 1 is provided with a stop table which is used for limiting the displacement of the shoulder of the regulating valve core 7 to the right. The spring seat 2 is provided with a shoulder, and the shoulder of the spring seat 2 is propped against the right end of the blocking table of the regulating valve shell 1.
A steel wire check ring 8 and an O-shaped sealing ring II 9 are arranged between the left end of the regulating valve shell 1 and the regulating valve sleeve 6, an O-shaped sealing ring I4 is arranged between the right end of the regulating valve shell 1 and the regulating valve rear cover 3, and an O-shaped sealing ring III 10 is arranged between the outer surface of the regulating valve shell 1 and a valve core hole of the valve body.
An O-shaped sealing ring IV 11, an O-shaped sealing ring V12 and an O-shaped sealing ring VI 13 are arranged between the outer surface of the valve sleeve 6 of the regulating valve and a valve core hole of the valve body. An O-shaped sealing ring IV 11 is positioned between the Q oil duct and the E oil duct; an O-shaped sealing ring V12 is positioned between the Dr oil passage and the Q oil passage; and an O-shaped sealing ring VI 13 is positioned on the left side of the Dr oil passage.
As shown in connection with figures 2 to 5,
the valve body is provided with a Dr oil duct, a P oil duct, a T oil duct and a Ls oil duct;
a K oil duct which is in a directional pair with the Dr oil duct, a Q oil duct which is in a directional pair with the P oil duct and an E oil duct which is in a directional pair with the T oil duct are formed in the regulating valve sleeve 6; an orifice I6-1 and an orifice II 6-2 which are opposite to the Dr oil passage are formed in the regulating valve sleeve 6, the diameter of the orifice I6-1 is smaller than that of the orifice II 6-2, and the orifice I6-1 is located on the left side of the orifice II 6-2;
the left end of the valve core 7 of the regulating valve is provided with an N containing cavity which is communicated with an L oil duct, an M oil duct and a K oil duct which are arranged on the valve sleeve 6 of the regulating valve; an F containing cavity matched with the Q oil duct and the E oil duct is formed in the outer surface of the middle of the valve core 7 of the regulating valve; the outer surface of the valve core 7 of the regulating valve on the left side of the F cavity is provided with a J cavity; the outer diameter of the valve core 7 of the regulating valve on the left side of the J containing cavity is smaller than that of the valve core 7 of the regulating valve on the right side of the J containing cavity; the valve core 7 of the regulating valve is provided with a radial G oil duct and an I oil duct, the G oil duct is communicated with the F containing cavity, and the I oil duct is communicated with the J containing cavity; the left end of the valve core 7 of the regulating valve is provided with an H oil duct which is communicated with a G oil duct and an I oil duct, and the left end of the H oil duct is provided with a plug 14;
an oil duct A opposite to the Ls oil duct is formed in the regulating valve shell 1, a cavity B is formed at the right end of the regulating valve core 7, and the oil duct A is communicated with the cavity B; the left end of the spring seat 2 is in clearance sliding fit with the right end of the regulating valve spool 7, the axis of the spring seat 2 is provided with a C oil duct, and the right end of the spring seat 2 is provided with a D containing cavity.
The working process comprises the following steps:
the P oil duct is connected with an oil outlet of the pump, the Dr oil duct and the T oil duct are directly connected with an oil tank, and the load of each actuating mechanism is connected with the Ls oil duct through the maximum load selected by the shuttle valve network or the logic oil path of the one-way valve;
1. when each actuating mechanism of the excavator does not work, the system is in an idling state, and the pressure of each actuating mechanism is zero, namely the pressure of the Ls oil way is zero;
at the moment, oil at the oil outlet of the pump passes through the P port → the Q oil channel on the regulating valve sleeve 6 → the F cavity → the G oil channel on the regulating valve core 7 → the H oil channel on the regulating valve core 7 → the I oil channel on the regulating valve core 7 → the J cavity; the structure of the regulating valve core 7 is shown in fig. 3, the regulating valve core 7 generates a rightward force under the action of the X, Y cross-sectional area difference and the pressure of the J cavity, and at this time, the N cavity passes through the M oil channel on the regulating valve core 7 → the L oil channel on the regulating valve core 7 → the K oil channel on the regulating valve sleeve 6 → the Dr cavity;
in summary, when the force generated by the P port at the J cavity is greater than the spring force at the D cavity, the valve core 7 of the regulating valve moves rightwards, and the movement of the valve core 7 of the regulating valve enables the P port to be gradually communicated with the T port through the orifice i 6-1 of the valve sleeve 6 of the regulating valve (the structure diagram of the valve sleeve 6 of the regulating valve is shown in fig. 4), until the thrust generated by the P port at the J cavity and the spring force at the D cavity are stable, the system is in an unloading state;
the movement of the regulator valve spool 7 causes oil in the oil tank to pass through the Dr oil passage → the K oil passage on the regulator valve sleeve 6 → the L oil passage on the regulator valve spool 7 → the M oil passage on the regulator valve spool 7 → the N reservoir.
2. When the excavator is provided with an actuating mechanism to work, the system is in a working state,
at the moment, the maximum load of the actuating mechanism is transmitted to the Ls oil channel through a shuttle valve network or a one-way valve logic oil channel, and the oil pressure of the Ls oil channel is transmitted to the C oil channel → the D cavity on the spring seat 2 through the A oil channel → the B cavity → the spring seat 2 and the matching clearance of the valve core of the regulating valve;
the flow direction of the pressure oil at the port P is the same as that in the idling state,
the oil flowing state of the N containing cavity is the idling state;
the force applied to the valve core 7 of the regulating valve is as follows:
the pressure of the oil line of the P port, the spring force of the D cavity and the pressure of the Ls oil line of the D cavity;
when the acting force generated by the pressure of the port P is smaller than or equal to the sum of the spring force of the cavity D and the force generated by the pressure of the oil circuit of the cavity D Ls, the valve core 7 of the regulating valve is in a closed state, namely no system oil passes through the unloading valve to reach the port T;
when the acting force generated by the pressure of the port P is larger than the sum of the spring force of the cavity D and the force generated by the pressure of the oil circuit of the cavity D, the valve core 7 of the regulating valve is in an opening state, namely a part of oil charge valve of the system reaches the port T, and the regulating valve is in a flow regulating state.
3. When a failure of the hydraulic system occurs, the hydraulic system is not in a working state,
the first state: the displacement of the pump is always acted by the Ls load pressure and continuously increased, so that the pressure of a port P is increased and exceeds the safe set pressure of the system;
and a second state: the valve core of the multi-way valve is reset, but the Ls load pressure is not attenuated to zero along with the reset of the valve core, but continuously exists, so that system pressure is formed, and the system pressure exceeds the safety set pressure of the system;
under the working condition, the pressure of the P port continuously rises, the regulating valve core 7 moves rightwards under the action of the pressure in the J cavity (communicated with the pressure of the P port), when the regulating valve core 7 moves to the L oil duct on the regulating valve core 7 to be communicated with the J cavity (at the moment, the L oil duct on the regulating valve core 7 and the K oil duct of the regulating valve sleeve 6 form a seal with the inner diameter of the regulating valve sleeve 6 through the outer diameter of the regulating valve core 7 but do not communicate with each other), so that the pressure oil discharged by the pump passes through a G oil duct on the regulating valve core 7 → an H oil duct on the regulating valve core 7 → an I oil duct on the regulating valve core 7 → the J cavity → the L on the regulating valve core 7 → an M oil duct on the regulating valve core 7 → an N cavity through a part of the P port, the regulating valve core 7 rapidly moves rightwards under the action of the pressures of the N cavity and the J cavity (the action area is the Y section), so that the regulating valve core 7 is in a completely opened state, at the moment, the oil discharged by the pump completely passes through a P port → a Q oil channel on the valve sleeve 6 of the regulating valve → an F cavity → an orifice I6-1 and an orifice II 6-2 on the valve sleeve 6 of the regulating valve and returns to the oil tank, so that the full unloading of the hydraulic system is completed;
under the condition, the flow discharged from the pump port can be completely unloaded, and the influence and damage of the change of the system pressure on other parts are avoided.
Example two
A hydraulic excavator adopts the multi-stage flow regulating valve of the embodiment.
The invention solves the problems of leakage and even oil injection between the main valve plates caused by overhigh system pressure, and realizes the stability of the hydraulic system pressure and the quick unloading of the system through multi-stage flow regulation. The pressure of the hydraulic system can be stabilized through the primary regulation of the flow regulating valve; through the two-stage regulation of the flow regulating valve, the unloading of the hydraulic system can be realized, the pressure building risk of the hydraulic system is avoided, and the safe operation of the hydraulic system is ensured.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (8)
1. A multi-stage flow control valve, which comprises a valve body,
the method is characterized in that:
the valve comprises a regulating valve sleeve (6), wherein the right end of the regulating valve sleeve (6) is connected with a regulating valve shell (1), and the right end of the regulating valve shell (1) is connected with a regulating valve rear cover (3); the regulating valve sleeve (6) and the regulating valve shell (1) are arranged in a valve core hole of the valve body; a regulating valve core (7) is installed in the regulating valve sleeve (6) in a matching way, a spring seat (2) is installed in the regulating valve shell (1) in a matching way, and a spring (5) is installed in the regulating valve rear cover (3); the left end of the spring seat (2) is matched with the valve core (7) of the regulating valve, and the right end of the spring seat (2) is contacted with the left end of the spring (5);
the valve body is provided with a Dr oil duct, a P oil duct, a T oil duct and a Ls oil duct;
a K oil duct which is in a pair with the Dr oil duct, a Q oil duct which is in a pair with the P oil duct and an E oil duct which is in a pair with the T oil duct are formed in the regulating valve sleeve (6);
the left end of the regulating valve core (7) is provided with an N-shaped cavity, and the N-shaped cavity is communicated with an L oil duct, an M oil duct and a K oil duct which are arranged on a regulating valve sleeve (6); an F containing cavity matched with the Q oil duct and the E oil duct is formed in the outer surface of the middle part of the valve core (7) of the regulating valve; the outer surface of a regulating valve core (7) on the left side of the F cavity is provided with a J cavity, the J cavity is communicated with the F cavity, and the outer diameter of the regulating valve core (7) on the left side of the J cavity is smaller than that of the regulating valve core (7) on the right side of the J cavity;
the regulating valve shell (1) is provided with an oil duct A which is opposite to the Ls oil duct, the right end of the regulating valve core (7) is provided with a cavity B, and the oil duct A is communicated with the cavity B;
the left end of the spring seat (2) is in clearance sliding fit with the right end of the regulating valve spool (7), the axis of the spring seat (2) is provided with a C oil duct, and the right end of the spring seat (2) is provided with a D containing cavity.
2. The multi-stage flow regulating valve of claim 1, wherein: and the regulating valve sleeve (6) is provided with a throttling hole I (6-1) and a throttling hole II (6-2) which are opposite to the Dr oil duct, the diameter of the throttling hole I (6-1) is smaller than that of the throttling hole II (6-2), and the throttling hole I (6-1) is positioned on the left side of the throttling hole II (6-2).
3. The multi-stage flow regulating valve of claim 1, wherein: the valve core (7) of the regulating valve is provided with a radial G oil duct and an I oil duct, the G oil duct is communicated with the F containing cavity, and the I oil duct is communicated with the J containing cavity; the left end of the regulating valve core (7) is provided with an H oil duct which is communicated with the G oil duct and the I oil duct, and the left end of the H oil duct is provided with a plug (14).
4. The multistage flow control valve according to claim 1, characterized in that: the right end of the regulating valve core (7) is provided with a shoulder, and the shoulder of the regulating valve core (7) is abutted against the right end of the regulating valve sleeve (6); the inner wall of the regulating valve shell (1) is provided with a stop table used for limiting the rightward displacement of the shoulder of the regulating valve core (7).
5. The multi-stage flow regulating valve according to claim 4, wherein: the spring seat (2) is provided with a shoulder, and the shoulder of the spring seat (2) abuts against the right end of the blocking table of the adjusting valve shell (1).
6. The multi-stage flow regulating valve of claim 1, wherein: a steel wire check ring (8) and an O-shaped sealing ring II (9) are arranged between the left end of the regulating valve shell (1) and the regulating valve sleeve (6), an O-shaped sealing ring I (4) is arranged between the right end of the regulating valve shell (1) and the regulating valve rear cover (3), and an O-shaped sealing ring III (10) is arranged between the outer surface of the regulating valve shell (1) and a valve core hole of the valve body.
7. The multi-stage flow regulating valve of claim 1, wherein: an O-shaped sealing ring IV (11), an O-shaped sealing ring V (12) and an O-shaped sealing ring VI (13) are arranged between the outer surface of the valve sleeve (6) of the regulating valve and a valve core hole of the valve body; the O-shaped sealing ring IV (11) is positioned between the Q oil duct and the E oil duct; the O-shaped sealing ring V (12) is positioned between the Dr oil duct and the Q oil duct; and the O-shaped sealing ring VI (13) is positioned on the left side of the Dr oil duct.
8. A hydraulic shovel characterized in that: use of a multi-stage flow regulating valve according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210753989.8A CN114962708A (en) | 2022-06-30 | 2022-06-30 | Multistage flow control valve and hydraulic excavator carrying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210753989.8A CN114962708A (en) | 2022-06-30 | 2022-06-30 | Multistage flow control valve and hydraulic excavator carrying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114962708A true CN114962708A (en) | 2022-08-30 |
Family
ID=82972174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210753989.8A Pending CN114962708A (en) | 2022-06-30 | 2022-06-30 | Multistage flow control valve and hydraulic excavator carrying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114962708A (en) |
-
2022
- 2022-06-30 CN CN202210753989.8A patent/CN114962708A/en active Pending
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