CN116972039A - Sequence valve with adjustable opening and closing pressure and adjusting method thereof - Google Patents

Sequence valve with adjustable opening and closing pressure and adjusting method thereof Download PDF

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Publication number
CN116972039A
CN116972039A CN202210429515.8A CN202210429515A CN116972039A CN 116972039 A CN116972039 A CN 116972039A CN 202210429515 A CN202210429515 A CN 202210429515A CN 116972039 A CN116972039 A CN 116972039A
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CN
China
Prior art keywords
pressure
opening
valve
control valve
closing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210429515.8A
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Chinese (zh)
Inventor
时文卓
戴子祥
李世振
杨旭
赵丹瑶
徐轲
史子麟
杜家伟
孙中原
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Shandong University
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Shandong University
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Priority to CN202210429515.8A priority Critical patent/CN116972039A/en
Publication of CN116972039A publication Critical patent/CN116972039A/en
Pending legal-status Critical Current

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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
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

An order valve with adjustable opening and closing pressure and an adjusting method thereof comprise an oil tank, a pilot control valve, an adjustable damping R1 and a main valve; the pilot control valve consists of an opening and closing pressure control valve port and a pilot valve and is used for controlling the pressure difference at two ends of a main valve core; the main valve is connected between the main pipeline and the oil tank through an oil way; an oil inlet of the adjustable damping R1 is communicated with an oil inlet P of the main pipeline, and an oil outlet of the adjustable damping R1 is communicated with a C2 side of an opening and closing pressure control valve port of the pilot control valve; the C1 side of the opening and closing pressure control valve port of the pilot control valve is communicated with the oil inlet P, and the oil outlet of the pilot control valve is communicated with the oil tank. The invention can adjust the opening and closing pressure of the valve, and has better performance than the common sequence valve under the condition of larger fluctuation of the input pressure amplitude.

Description

Sequence valve with adjustable opening and closing pressure and adjusting method thereof
Technical Field
The invention relates to a sequence valve with adjustable opening and closing pressure and an adjusting method thereof, belonging to the technical field of hydraulic valves.
Background
A sequence valve is a pressure control valve in a hydraulic system, which is commonly used to effect sequential actuation of actuators. The sequence valve controls the valve opening through the pressure conversion of the oil way, and completes the on-off of the oil way, thereby realizing the preset sequence actions of a plurality of execution elements.
Most of the existing sequence valves are set to an opening pressure by adjusting the precompression amount of a spring, the sequence valve is opened when the pressure of the input sequence valve reaches or exceeds the opening pressure, and the sequence valve is closed when the pressure of the input sequence valve is lower than a closing pressure. The closing pressure in this way can only be set to be the same as the opening pressure, although in practical production application occasions, the closing pressure can be slightly lower than the opening pressure due to friction force, under the condition that the amplitude fluctuation of the input pressure of some hydraulic systems is large (such as some systems under the action of offshore wave conditions), if the opening pressure of the sequence valve is the same as or the difference value between the opening pressure and the closing pressure is not large, the sequence valve can be frequently opened or closed, the hydraulic systems can be oscillated, and the working safety is further compromised.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the sequence valve with adjustable opening and closing pressure, which can adjust the opening and closing pressure of the valve and has better performance than the common sequence valve under the condition of larger fluctuation of the input pressure amplitude.
The technical scheme adopted by the invention is as follows:
the sequence valve with adjustable opening and closing pressure comprises an oil tank, a pilot control valve, an adjustable damping R1 and a main valve;
the pilot control valve consists of an opening and closing pressure control valve port and a pilot valve and is used for controlling the pressure difference at two ends of a main valve core; the main valve is connected between the main pipeline and the oil tank through an oil way; an oil inlet of the adjustable damping R1 is communicated with an oil inlet P of the main pipeline, and an oil outlet of the adjustable damping R1 is communicated with a C2 side of an opening and closing pressure control valve port of the pilot control valve; the C1 side of the opening and closing pressure control valve port of the pilot control valve is communicated with the oil inlet P, and the oil outlet of the pilot control valve is communicated with the oil tank.
The method for adjusting the sequence valve with adjustable opening and closing pressure comprises the following steps:
(1) In the initial state, when the system pressure does not reach the set value, the opening and closing pressure control valve port is in a right position state, namely a closed state, and the pressures at two ends of the opening and closing pressure control valve port of the pilot control valve are equal, namely P C1 ＝P C2 The pressure at the two ends of the main valve core is equal, the main valve of the sequence valve is closed, and the oil inlet P and the oil outlet A are not communicated;
as the input pressure of the system exceeds the set value, the pilot valve is opened, the valve core of the pilot valve pushes the spring to move, the two ends of the valve core of the main valve generate pressure difference, the oil inlet and the oil outlet are opened, and the formula is expressed as follows:
P C1 A C1 -P C2 A C2 ＞F bullet (1)
Wherein P is C1 The pressure at the end C1 of the valve port is controlled for opening and closing the pressure; p (P) C2 The pressure at the C2 end of the valve port is controlled for opening and closing the pressure; a is that C1 The area of the end of the valve port C1 is controlled for opening and closing the pressure; a is that C2 The area of the end C2 of the valve port is controlled for opening and closing the pressure; f (F) Bullet In order to set the pressure, the larger the precompression amount is, the larger the set pressure is, which is related to the precompression amount of the pressure regulating spring;
will P C2 ＝P C1 The formula (1) is carried out:
wherein alpha is the area ratio,P opening device Is the cracking pressure;
(2) Opening state: after the main valve is opened, the opening and closing pressure control valve port is in a left position state, namely a conducting state, and the pressures at two ends of the opening and closing pressure control valve port can be known according to a flow continuity equation:
G R1 (P C1 -P C2 )＝G R2 P C2
wherein G is R1 ,G R2 Liquid guides of the adjustable damping R1 and the opening and closing pressure control valve port damping R2 are respectively arranged;
the main valve closes when the following is satisfied:
P C1 A C1 -P C2 A C2 ＜F bullet (4)
Substituting the formula (3) into the formula (4) to obtain:
wherein P is Closing the door Is the closing pressure;
it is obvious that the process is not limited to,the opening and closing pressure of the sequence valve can be set by adjusting the beta value, the beta value can be adjusted by changing the damping of the adjustable damping R1, the overflow area of the adjustable damping R1 is increased, and the liquid guide is increased.
The invention is not exhaustive and can be seen in the prior art.
The beneficial effects of the invention are as follows:
the sequence valve of the invention is provided with the opening and closing pressure control valve port on the pilot valve of the conventional sequence valve (the opening and closing pressure control valve port and the pilot valve are arranged on the same valve core, namely, the invention has more valve ports than the common pilot valve), so that the opening pressure and the closing pressure of the sequence valve are adjustable, and the problems that the common sequence valve is frequently opened and closed and the hydraulic system oscillates under the condition that the amplitude fluctuation of the input pressure of the hydraulic system is larger (such as some systems under the action of offshore wave conditions) can be solved.
Drawings
FIG. 1 is a hydraulic schematic of the present invention;
FIG. 2 is a simulation diagram based on AMESim in accordance with the present invention;
FIG. 3 is a simulation plot of inlet pressure and outlet pressure;
FIG. 4 is a simulation plot of the on-off pressure control valve port C1 end pressure and inlet pressure;
FIG. 5 is a simulation plot of cylinder displacement;
in the figure, a 1-oil tank, a 2-pilot control valve and 3-adjustable damping R1, 4-main valve.
The specific embodiment is as follows:
in order to make the technical problems, technical solutions and advantages to be solved by the present invention more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments, but not limited thereto, and the present invention is not fully described and is according to the conventional technology in the art.
Example 1:
an order valve with adjustable opening and closing pressure, as shown in figures 1-2, comprises an oil tank 1, a pilot control valve 2, an adjustable damping R1 3 and a main valve 4;
the pilot control valve consists of an opening and closing pressure control valve port and a pilot valve and is used for controlling the pressure difference at two ends of a main valve core; the main valve 4 is connected between the main pipeline and the oil tank through an oil way; an oil inlet of the adjustable damping R1 3 is communicated with an oil inlet P of the main pipeline, and an oil outlet of the adjustable damping R1 is communicated with a C2 side of an opening and closing pressure control valve port of the pilot control valve; the C1 side of the opening and closing pressure control valve port of the pilot control valve 2 is communicated with the main oil inlet P, and the oil outlet of the pilot control valve port is communicated with the oil tank.
Example 2:
a method for adjusting a sequence valve with adjustable opening and closing pressure comprises the following steps:
(1) In the initial state, when the system pressure does not reach the set value, the opening and closing pressure control valve port is in a right position state, namely a closed state, and the pressures at two ends of the opening and closing pressure control valve port of the pilot control valve are equal, namely P C1 ＝P C2 The pressure at the two ends of the main valve core is equal, the main valve of the sequence valve is closed, and the oil inlet P and the oil outlet A are not communicated;
as the input pressure of the system exceeds the set value, the pilot valve is opened, the valve core of the pilot valve pushes the spring to move, the two ends of the valve core of the main valve generate pressure difference, the oil inlet and the oil outlet are opened, and the formula is expressed as follows:
P C1 A C1 -P C2 A C2 ＞F bullet (1)
Wherein P is C1 The pressure at the end C1 of the valve port is controlled for opening and closing the pressure; p (P) C2 The pressure at the C2 end of the valve port is controlled for opening and closing the pressure; a is that C1 The area of the end of the valve port C1 is controlled for opening and closing the pressure; a is that C2 The area of the end C2 of the valve port is controlled for opening and closing the pressure; f (F) Bullet In order to set the pressure, the larger the precompression amount is, the larger the set pressure is, which is related to the precompression amount of the pressure regulating spring;
will P C2 ＝P C1 The formula (1) is carried out:
wherein alpha is the area ratio,P opening device Is the cracking pressure;
(2) Opening state: after the main valve is opened, the opening and closing pressure control valve port is in a left position state, namely a conducting state, and the pressures at two ends of the opening and closing pressure control valve port can be known according to a flow continuity equation:
G R1 (P C1 -P C2 )＝G R2 P C2
wherein G is R1 ,G R2 Liquid guides of the adjustable damping R1 and the opening and closing pressure control valve port damping R2 are respectively arranged;
the main valve closes when the following is satisfied:
P C1 A C1 -P C2 A C2 ＜F bullet (4)
Substituting the formula (3) into the formula (4) to obtain:
wherein P is Closing the door Is the closing pressure;
it is obvious that the process is not limited to,the opening and closing pressure of the sequence valve can be set by adjusting the beta value. The beta value can be adjusted by changing the damping of the adjustable damping R1, and also can be adjusted by changing the size of the damping hole, the overflow area of the adjustable damping R1 is increased, and the liquid guide is increased.
The simulation diagram shown in fig. 2 is established by using AMESim, and the main structure of the simulation diagram is composed of a main valve 4, an adjustable damping R1 and a pilot control valve. The design parameters are as follows: the diameter phi of the opening and closing pressure control valve port C1 C1 The diameter phi of the opening and closing pressure control valve port C2 is 3.5mm C2 =2.1 mm, area ratioF Bullet ＝92N，/>By matching the adjustable damping R1 with the opening and closing pressure control valve port damping R2, designing β=0.5, and calculating the opening pressure and closing pressure according to the above design by the calculation method of the present invention as follows:
according to the simulation data result, the opening of the point A is 151.6bar, the closing of the point B is 114.3bar, and the point A is basically consistent with the design calculation result, and the point A is slightly different from the simulation result because the interference factors such as oil compressibility, valve port hydrodynamic force and the like are not considered in the calculation. The sequence valve designed by the invention has adjustable opening and closing pressure, and effectively solves the problems that the common sequence valve is frequently opened and closed and the hydraulic system oscillates under the condition that the amplitude fluctuation of the input pressure of the hydraulic system is large (such as some systems under the action of offshore wave conditions).
In fig. 3 to 5, the abscissa is time, the ordinate is pressure or displacement, and at time a, the system pressure reaches the opening pressure, the pilot control valve is opened (as shown in fig. 4, wherein the control cavity pressure is the pressure of the C1 end), and the oil cylinder starts to displace (as shown in fig. 5); at the time B, the system pressure reaches the closing pressure, the pilot control valve is closed (as shown in fig. 4), the displacement of the oil cylinder is stopped (fig. 5), and the opening pressure of the system at the time A and the closing pressure at the time B meet the following relation:(fig. 3), in actual operation, the opening pressure of the sequence valve may be set by the area ratio α; the closing pressure is set by adjusting the adjustable damping R1, so that the opening and closing pressure is adjustable.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims (2)

1. The sequence valve with adjustable opening and closing pressure is characterized by comprising an oil tank, a pilot control valve, an adjustable damping R1 and a main valve;
the pilot control valve consists of an opening and closing pressure control valve port and a pilot valve and is used for controlling the pressure difference at two ends of a main valve core; the main valve is connected between the main pipeline and the oil tank through an oil way; an oil inlet of the adjustable damping R1 is communicated with an oil inlet P of the main pipeline, and an oil outlet of the adjustable damping R1 is communicated with a C2 side of an opening and closing pressure control valve port of the pilot control valve; the C1 side of the opening and closing pressure control valve port of the pilot control valve is communicated with the oil inlet P, and the oil outlet of the pilot control valve is communicated with the oil tank.
2. A method of regulating a sequence valve having an adjustable on-off pressure as claimed in claim 1, comprising the steps of:
(1) In the initial state, when the system pressure does not reach the set value, the opening and closing pressure control valve port is in a right position state, namely a closed state, and the pressures at two ends of the opening and closing pressure control valve port of the pilot control valve are equal, namely P C1 ＝P C2 The pressure at the two ends of the main valve core is equal, the main valve of the sequence valve is closed, and the oil inlet P and the oil outlet A are not communicated;
as the input pressure of the system exceeds the set value, the pilot valve is opened, the valve core of the pilot valve pushes the spring to move, the two ends of the valve core of the main valve generate pressure difference, the oil inlet and the oil outlet are opened, and the formula is expressed as follows:
P C1 A C1 -P C2 A C2 ＞F bullet (1)
Wherein P is C1 The pressure at the end C1 of the valve port is controlled for opening and closing the pressure; p (P) C2 The pressure at the C2 end of the valve port is controlled for opening and closing the pressure; a is that C1 The area of the end of the valve port C1 is controlled for opening and closing the pressure; a is that C2 The area of the end C2 of the valve port is controlled for opening and closing the pressure; f (F) Bullet To set the pressure, the pre-compression amount of the pressure regulating spring is related;
will P C2 ＝P C1 The formula (1) is carried out:
wherein alpha is the area ratio,P opening device Is the cracking pressure;
(2) Opening state: after the main valve is opened, the opening and closing pressure control valve port is in a left position state, namely a conducting state, and the pressures at two ends of the opening and closing pressure control valve port can be known according to a flow continuity equation:
G R1 (P C1 -P C2 )＝G R2 P C2
wherein G is R1 ,G R2 Liquid guides of the adjustable damping R1 and the opening and closing pressure control valve port damping R2 are respectively arranged;
the main valve closes when the following is satisfied:
P C1 A C1 -P C2 A C2 ＜F bullet (4)
Substituting the formula (3) into the formula (4) to obtain:
wherein P is Closing the door Is the closing pressure;
it is obvious that the process is not limited to,the opening and closing pressure of the sequence valve can be set by adjusting the beta value, which is adjusted by changing the damping of the adjustable damping R1. />
CN202210429515.8A 2022-04-22 2022-04-22 Sequence valve with adjustable opening and closing pressure and adjusting method thereof Pending CN116972039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210429515.8A CN116972039A (en) 2022-04-22 2022-04-22 Sequence valve with adjustable opening and closing pressure and adjusting method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210429515.8A CN116972039A (en) 2022-04-22 2022-04-22 Sequence valve with adjustable opening and closing pressure and adjusting method thereof

Publications (1)

Publication Number Publication Date
CN116972039A true CN116972039A (en) 2023-10-31

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ID=88480168

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210429515.8A Pending CN116972039A (en) 2022-04-22 2022-04-22 Sequence valve with adjustable opening and closing pressure and adjusting method thereof

Country Status (1)

Country Link
CN (1) CN116972039A (en)

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