CN113074155A - Negative pressure opening plug-in mounting type oil replenishing valve - Google Patents
Negative pressure opening plug-in mounting type oil replenishing valve Download PDFInfo
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- CN113074155A CN113074155A CN202110362591.7A CN202110362591A CN113074155A CN 113074155 A CN113074155 A CN 113074155A CN 202110362591 A CN202110362591 A CN 202110362591A CN 113074155 A CN113074155 A CN 113074155A
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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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0446—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces
- F16K17/046—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces the valve being of the gate valve type or the sliding valve type
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Abstract
The invention relates to a negative pressure opening cartridge type oil compensating valve, which comprises a valve sleeve, a valve core, an end cover and a pressure regulating spring, wherein the valve sleeve is internally provided with a first step hole and is in a boss shape, the valve core is in a boss shape and is internally provided with a second step hole, the end cover is matched with the large-diameter end of the valve sleeve, the first-stage hole of the first step hole is used as an oil outlet hole communicated with an external hydraulic cylinder, the valve core is coaxially matched and arranged in the second-stage hole of the first step hole, an oil inlet cavity is formed between the outer surface of the small-diameter section of the valve core and the inner wall of the second-stage hole of the first step hole, the oil inlet cavity is communicated with an oil return end through a radial oil through hole arranged on the side wall of the valve sleeve, the top of the small-diameter section of the valve core is axially provided with a round small hole communicated with the oil outlet hole and the second step hole, the oil compensating valve is, compared with the prior art, the invention has the advantages of simple structure, safety, reliability, realization of negative pressure compensation and the like.
Description
Technical Field
The invention relates to the technical field of fluid transmission and control in mechanical engineering, in particular to a negative pressure opening plug-in type oil replenishing valve.
Background
The diameter of a working cylinder of a common large-scale hydraulic pile hammer machine is large, the oil supply of a pump station is cut off at the transition stage between the rising stage and the falling stage of the hydraulic pile hammer, but the speed is not zero due to the inertia rising of a hammer core, when the hammer core continuously rises, the oil cylinder needs to be filled with liquid quickly, if the hydraulic oil cannot be supplied to the oil cylinder in time, the oil cylinder is easy to generate air pockets due to air suction, and the noise, the vibration, the corrosion of the surface of the oil cylinder, the elastic modulus of the oil liquid are reduced, and the. Generally, a one-way valve is adopted as an oil supplementing element of the system, but the time for recovering from opening to closing is slow, so that the sensitivity of the oil supplementing mode is low, the problems of the system caused by untimely oil supplement are easy to occur, and the like, and the oil supplementing mode is particularly not suitable for a hydraulic impact system of a hydraulic pile hammer machine.
Chinese patent CN 102535465a discloses a hydraulic-pneumatic composite pile hammer, which proposes a mechanical structure of a hydraulic-pneumatic composite pile hammer, and a working cycle thereof includes: an ascending stage, an inertia ascending stage, a descending stage and a pressure maintaining stage. In the ascending stage, a high-pressure energy accumulator and a hydraulic pump are used for supplying oil together, and oil is quickly supplied to the oil cylinder; and in the descending stage, a low-pressure accumulator is adopted on the oil return path, when the oil return path is long and the oil return pressure loss is large, the low-pressure accumulator group quickly absorbs hydraulic oil discharged by the oil cylinder to realize quick falling and striking of the pile hammer, the oil cylinder is in a transient closed state in the inertia ascending stage, and the low-pressure accumulator group supplies oil to the hydraulic cylinder through the oil return path one-way cartridge valve to prevent air suction and absorb vibration and buffer.
Chinese patent CN211573913U discloses a lifting oil cylinder of a hydraulic hammer and a valve block combination thereof, aiming at the technical problems of high requirements on reversing stability and rapidity and large reversing impact in the design of the hydraulic hammer, the lifting oil cylinder of the hydraulic hammer and the valve block combination thereof are designed to meet the control requirements of high-speed flow and timely reversing of hydraulic oil in the rising process and the falling process of the hydraulic hammer.
However, the sensitivities of the two prior arts are both low, and the situation of untimely oil supplement is easy to occur when the hydraulic pile hammer mechanical hydraulic impact system is applied, so that a negative pressure opening plug-in type oil supplement valve is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a negative pressure opening cartridge type oil replenishing valve which can effectively avoid cavitation caused by the suction of hydraulic oil.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a cartridge formula fuel filling valve is opened to negative pressure, is applied to in the hydraulic hammer machinery hydraulic shock system of hydraulic pressure for avoid hydraulic pressure oil to inhale empty and produce cavitation, this fuel filling valve includes that inside sets up first step hole and is the valve barrel of boss form, is the case that boss form and inside set up second step hole, with the major diameter end complex end cover and the pressure regulating spring of valve barrel, the first order hole of first step hole as the oil outlet with outside pneumatic cylinder intercommunication, the coaxial cooperation of case set up in the second level hole of first step hole, form the oil feed chamber between the second level downthehole wall of case minor diameter section surface and first step hole to this oil feed chamber leads to oilhole and return oil end intercommunication in the radial of seting up on the valve barrel lateral wall, the top axial of case minor diameter section set up the circular aperture of intercommunication oil outlet and second step hole.
The end cover, the second-stage hole inner wall of the first step hole and the second-stage hole inner wall of the second step hole jointly form a spring cavity, and the pressure regulating spring is installed in the spring cavity.
Pressure regulating spring one end and the circular table spring seat on the end cover be connected, the other end card is established on the boss face in second step hole, the case under oil pressure and pressure regulating spring's combined action, slide in the second level hole in first step hole, realize the on-off control of oil feed chamber and oil outlet, and then mend oil when the negative pressure appears in outside pneumatic cylinder.
The major diameter of the spring cavity is larger than the inner diameter of the oil outlet, so that the effective acting area of the oil pressure of the spring cavity is larger than that of the oil outlet.
When the oil outlet is connected with hydraulic oil and is the malleation, spring chamber and oil outlet intercommunication, the case is in the closed position under the combined action of spring chamber hydraulic oil pressure and pressure regulating spring force, and case minor diameter section blocks oil inlet chamber and oil outlet, does not mend oil.
When the oil outlet is connected with hydraulic oil and is negative pressure or zero pressure, the spring cavity is communicated with the oil outlet, the valve core is opened under the combined action of hydraulic oil pressure in the spring cavity and spring force of the pressure regulating spring, the oil inlet cavity is communicated with the oil outlet, and hydraulic oil at the oil return end sequentially passes through the radial oil through hole, the oil inlet cavity and the oil outlet hole to supplement oil for an external hydraulic cylinder.
For the scene that oil is not timely supplemented due to the fact that an oil return pipeline is too long in the working process of the hydraulic hammer, an energy accumulator is additionally arranged at the position close to an oil inlet cavity of an oil supplementing valve to provide hydraulic oil, and the hydraulic hammer is suitable for being used for achieving quick oil supplementation when the oil cylinder is temporarily closed in the reversing stage of the hydraulic hammer machinery, the piston continues to move due to the fact that the speed is not zero, and the rod cavity is empty.
The radial oil through holes are uniformly formed along the circumferential direction of the side wall of the valve sleeve.
The number of the radial oil through holes is 3.
The mathematical model of the oil replenishing valve is as follows:
wherein A isaFor the oil inlet C, the effective action area of the hydraulic oil, AbThe effective action area of the hydraulic oil in the oil inlet cavity B, AcFor the effective working area, k, of the hydraulic oil in the spring chamber AsIs the spring rate, x0For pre-compression of the spring, xsIs the displacement of the valve core, msIs the mass of the valve core, BsIs the damping coefficient of the valve core, KsIs hydrodynamically rigid, and Ks＝Cdπdasin2 alpha, wherein, CdIs the flow coefficient, daIs the diameter of valve port, alpha is half-cone angle of valve core, delta P is valve port pressure difference, QbFor instantaneous flow through the radial oil-passing bore into the oil-replenishing valve, QdFor instantaneous flow of oil outlet C of oil-filling valve, PlaFor the pressure of the hydraulic oil in the oil inlet chamber B, PdThe pressure of hydraulic oil at the spring cavity A and the oil inlet C, t is time, A (x) is the flow area of the valve port, CqIs the flow coefficient of the valve port, and rho is the hydraulic oil density.
Compared with the prior art, the invention has the following advantages:
the invention provides a negative pressure opening plug-in mounting type oil supplementing valve, which solves the problems of noise, vibration, corrosion on the surface of an oil cylinder, reduction in the elastic modulus of oil and the like when a hydraulic system is in a negative pressure suction empty state, has high response speed, is suitable for high-frequency operation of a hydraulic hammer machine, and is suitable for short-term sealing of the oil cylinder in a reversing stage and continuous movement of a piston to cause a suction empty state.
In addition, because the effective action area of the spring cavity of the oil supplementing valve is larger than that of the oil outlet, the oil supplementing valve is reliably closed when the execution mechanism works at high pressure, the negative pressure suction phenomenon occurs in the oil path of the execution mechanism, the oil inlet cavity of the oil supplementing valve is communicated with the oil outlet, oil supplementing is realized, the oil supplementing valve is opened only when the oil path has negative pressure or zero pressure, and is effectively closed under other conditions, so that the oil supplementing valve is safe and reliable.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of an oil replenishment valve according to an embodiment of the present invention.
Fig. 2 is a schematic two-dimensional structure diagram of an oil filling valve according to an embodiment of the invention.
Fig. 3 is a hydraulic schematic diagram of an oil compensating valve according to an embodiment of the invention.
Fig. 4 is a pressure jump curve diagram of an oil outlet of an oil filling valve according to an embodiment of the invention.
FIG. 5 is a flow time chart of an oil outlet of an oil filling valve according to an embodiment of the invention.
The notation in the figure is:
1. the oil-gas mixing valve comprises a valve sleeve, 2, a valve core, 3, a pressure regulating spring, 4, an end cover, 5, a radial oil through hole, 6, a round small hole, 7, a sealing ring, A, a spring cavity, B, an oil inlet cavity, C and an oil outlet.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
Fig. 1 is a schematic three-dimensional structure diagram of an oil replenishment valve according to an embodiment of the present invention. As shown in fig. 1, the invention provides a negative pressure opening cartridge type oil compensating valve, which only comprises a valve sleeve 1, a valve core 2, a pressure regulating spring 3 and an end cover 4 in structure, and has a simpler structure.
Specifically, valve barrel 1 is the tubulose, and its waist is opened there are 3 radial oil through holes 5, is linked together with the oil return end, and case 2 is the axle form of ladder type, and its big diameter end cooperates with end cover 4, and inside is opened there is the ladder type hole, and 3 one side of pressure regulating spring are installed in2 ladder type holes of case, and one side is installed on the spring holder of end cover 4, all is provided with sealing washer 7 in the side recess of valve barrel 1 for realize cartridge formula is sealed.
Fig. 2 is a schematic two-dimensional structure diagram of an oil filling valve according to an embodiment of the invention. As shown in fig. 2, the waist of the valve sleeve 1 is provided with a radial oil through hole 5 communicated with an oil return end, the outer wall of the small-diameter end of the valve core 2 and the inner wall of the valve sleeve 1 form an oil inlet cavity B, the small-diameter end of the valve sleeve 1 is provided with a step hole communicated with a hydraulic cylinder and used as an oil outlet C of the oil replenishing valve, the top of the small-diameter end of the valve core 2 is axially provided with a round small hole 6 so that the spring cavity a of the oil replenishing valve is communicated with the oil outlet C, hydraulic oil enters the spring cavity a from the hydraulic cylinder through the oil outlet C, the spring cavity a is kept full of the hydraulic oil, the hydraulic oil on two sides of the valve core has the same pressure, the opening and.
The specific working principle is as follows:
the closed state of the oil replenishing valve: in a high-pressure stage, hydraulic oil of the hydraulic cylinder enters an oil supplementing valve spring cavity A through a small circular hole 6 in the top of an oil supplementing valve core 2, the effective action area of the oil supplementing valve spring cavity A is larger than that of an oil outlet C, and the valve core 2 is in a closed state under the action of a spring and the hydraulic oil pressure of the hydraulic cylinder;
opening state of the oil replenishing valve: when the hydraulic cylinder is in a closed state and the piston speed is not zero, the piston continues to move, the oil cylinder generates negative pressure due to oil shortage, the spring cavity A communicated with the oil cylinder also generates negative pressure, the valve core is jacked open under the action of hydraulic oil pressure in the oil inlet cavity B, the oil inlet cavity B is communicated with the oil outlet C, and oil is supplemented.
Fig. 3 is a hydraulic schematic diagram of an oil compensating valve according to an embodiment of the invention. As shown in fig. 3, the graphic symbols are:
Qbthe instantaneous flow rate is the instantaneous flow rate entering the oil supplementing valve through the radial oil through hole 5 of the valve sleeve 1; qcThe instantaneous flow of the hydraulic oil flowing out of the spring cavity A; qdThe instantaneous flow of the oil outlet C of the oil replenishing valve is obtained; plaThe pressure of the hydraulic oil in the oil inlet cavity B is measured; pdIs the hydraulic oil pressure at the spring cavity A and the oil inlet CForce.
Specifically, according to a hydraulic schematic diagram, an oil compensating valve mathematical model can be established, and the valve core stress analysis of the oil compensating valve mathematical model comprises the following steps:
in the formula, AaFor the oil inlet C, the effective action area of the hydraulic oil, AbThe effective action area of the hydraulic oil in the oil inlet cavity B, AcFor the effective working area, k, of the hydraulic oil in the spring chamber AsIs the spring rate, x0For pre-compression of the spring, xsIs the displacement of the valve core, msIs the mass of the valve core, BsIs the damping coefficient of the valve core, KsIs hydrodynamically rigid, and Ks＝Cdπdasin2 alpha, wherein, CdIs the flow coefficient, daIs the diameter of the valve port, alpha is the half cone angle of the valve core, and delta P is the pressure difference of the valve port.
Aa、Ab、AcRespectively as follows:
in FIG. 3, da、db、dcThe effective diameters of the oil outlet, the circular small hole at the top of the valve core and the spring cavity are respectively.
When the oil replenishing valve is opened, a throttling effect can be generated at the valve port of the oil replenishing valve, the instantaneous flow of the valve port of the oil replenishing valve is mainly determined by the flow area of the valve port, the displacement of a valve core, the pressure difference between an inlet and an outlet and the like, and the calculation formula is as follows:
wherein A (x) is the flow area of the valve port and is related to the shape of the valve port; cqThe flow coefficient of the valve port is related to the shape of the valve port and Reynolds number; ρ is the hydraulic oil density.
The valve port pressure difference delta P is:
ΔP＝Pla-Pd
in the opening process of the oil replenishing valve, the volume of a spring cavity is reduced, hydraulic oil is led to the hydraulic cylinder through a small hole in the middle of a valve core of the oil replenishing valve, compression is not considered, and the flow equation is as follows:
the flow continuity formula shows that:
by integrating the above formula, the mathematical model of the oil filling valve is as follows:
furthermore, the effective action area of the spring cavity A of the oil supplementing valve is larger than that of the oil outlet C, when the execution mechanism works at high pressure, the oil supplementing valve is reliably closed, negative pressure occurs in an oil way of the execution mechanism, the spring cavity A communicated with the oil way is also negative pressure, hydraulic oil in the oil inlet cavity B jacks the valve core of the oil supplementing valve, the oil inlet cavity B of the oil supplementing valve is communicated with the oil outlet C, oil supplementing is realized, the oil supplementing valve is opened only under the condition that the oil way has negative pressure or zero pressure, and is effectively closed under other conditions, so that cavitation caused by air suction of the hydraulic oil can be effectively avoided.
Fig. 4 and 5 are respectively a pressure abrupt change curve of an oil outlet of an oil filling valve and a flow time curve of the oil outlet according to an embodiment of the invention. As shown in the figurePressure P at the oil outletdThe pressure sudden change occurs at the moment of 1s, the outlet flow of the oil outlet sharply increases at the moment of 1s, the maximum outlet flow can reach 5L/min, and the response speed is in the millisecond level.
In summary, the negative pressure opening cartridge type oil replenishing valve provided by the invention has a simpler structure and mainly comprises a valve sleeve, a valve core, an end cover and a pressure regulating spring. The waist of the valve sleeve is provided with a plurality of radial oil through holes communicated with the oil return end, the inner wall of the valve sleeve and the outer wall of the valve core form an oil inlet cavity, the valve core is a stepped shaft, the axial top of the small-diameter end is provided with a round small hole, so that the spring cavity is communicated with the oil outlet, the effective action area of the spring cavity of the oil replenishing valve is larger than that of the oil outlet, when the execution mechanism works at high pressure, the oil replenishing valve is reliably closed, the negative pressure suction phenomenon occurs in the oil circuit of the execution mechanism, the oil inlet cavity of the oil replenishing valve is communicated with the oil outlet, oil replenishing is realized, and the oil replenishing valve is opened only under the condition that the oil circuit has negative.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (10)
1. A negative pressure opening cartridge type oil supplementing valve is applied to a hydraulic impact system of a hydraulic pile hammer machine and used for avoiding cavitation caused by the fact that hydraulic oil is sucked out, and is characterized by comprising a valve sleeve (1) which is internally provided with a first step hole and is in a boss shape, a valve core (2) which is in a boss shape and is internally provided with a second step hole, an end cover (4) matched with the large-diameter end of the valve sleeve (1) and a pressure regulating spring (3), wherein the first step hole of the first step hole is used as an oil outlet hole (C) communicated with an external hydraulic cylinder, the valve core (2) is coaxially matched and arranged in the second step hole of the first step hole, an oil inlet cavity (B) is formed between the outer surface of the small-diameter section of the valve core (2) and the inner wall of the second step hole of the first step hole, and is communicated with an oil return end through a radial oil through hole (5) formed in the side wall of the valve sleeve (1), the top of the small diameter section of the valve core (2) is axially provided with a round small hole (6) which is communicated with the oil outlet hole (C) and the second step hole.
2. The negative-pressure opening cartridge-type oil replenishing valve according to claim 1, wherein the end cover (4), the inner wall of the second-stage hole of the first stepped hole and the inner wall of the second-stage hole of the second stepped hole jointly form a spring cavity (A), and the pressure regulating spring (3) is installed in the spring cavity (A).
3. The negative pressure opening cartridge type oil replenishing valve according to claim 2, wherein one end of the pressure regulating spring (3) is connected with a circular table spring seat on the end cover (4), the other end of the pressure regulating spring is clamped on a boss surface of the second step hole, the valve core (2) slides in the second stage hole of the first step hole under the combined action of oil pressure and the pressure regulating spring (3), on-off control of the oil inlet cavity (B) and the oil outlet hole (C) is achieved, and oil replenishing is further performed when negative pressure occurs in an external hydraulic cylinder.
4. The cartridge-type oil replenishing valve according to claim 2, wherein the major diameter of the spring chamber (A) is larger than the inner diameter of the oil outlet (C), so that the effective acting area of the oil pressure of the spring chamber (A) is larger than that of the oil outlet (C).
5. The negative-pressure opening cartridge type oil replenishing valve according to claim 4, wherein when the oil outlet (C) is connected with hydraulic oil and is in positive pressure, the spring cavity (A) is communicated with the oil outlet (C), the valve core (2) is in a closed position under the combined action of the hydraulic oil pressure in the spring cavity (A) and the spring force of the pressure regulating spring (3), and the oil inlet cavity (B) and the oil outlet (C) are blocked by the small-diameter section of the valve core (2) without oil replenishing.
6. The negative-pressure opening cartridge type oil replenishing valve according to claim 4, wherein when the oil outlet (C) is connected with hydraulic oil and is negative pressure or zero pressure, the spring cavity (A) is communicated with the oil outlet (C), the valve core (2) is opened under the combined action of the hydraulic oil pressure in the spring cavity (A) and the spring force of the pressure regulating spring (3), so that the oil inlet cavity (B) is communicated with the oil outlet (C), and the hydraulic oil at the oil return end sequentially passes through the radial oil through hole (5), the oil inlet cavity (B) and the oil outlet (C) to replenish oil to an external hydraulic cylinder.
7. The negative-pressure opening cartridge type oil replenishing valve according to claim 6, wherein for the application in the scene of untimely oil replenishing caused by the overlong oil return pipeline in the hydraulic hammer operation, an energy accumulator is additionally arranged near the oil inlet cavity (B) of the oil replenishing valve to provide hydraulic oil, so that the negative-pressure opening cartridge type oil replenishing valve is suitable for realizing quick oil replenishing when the oil cylinder is temporarily closed in the reversing stage of the hydraulic hammer machine, the piston continues to move because the speed is not zero, and the rod cavity is in an empty sucking state.
8. The cartridge-type oil compensating valve opened under negative pressure as claimed in claim 1, wherein the radial oil through holes (5) are uniformly arranged along the circumferential direction of the side wall of the valve housing (1).
9. The cartridge-type oil compensating valve opened under negative pressure as claimed in claim 8, wherein the number of the radial oil passing holes (5) is 3.
10. The negative-pressure opening cartridge type oil replenishing valve according to claim 4, wherein the mathematical model of the oil replenishing valve is as follows:
wherein A isaFor the oil inlet C, the effective action area of the hydraulic oil, AbThe effective action area of the hydraulic oil in the oil inlet cavity B, AcFor the effective working area, k, of the hydraulic oil in the spring chamber AsIs the spring rate, x0For pre-compression of the spring, xsIs a valve coreDisplacement, msIs the mass of the valve core, BsIs the damping coefficient of the valve core, KsIs hydrodynamically rigid, and Ks＝Cdπdasin2 alpha, wherein, CdIs the flow coefficient, daIs the diameter of valve port, alpha is half-cone angle of valve core, delta P is valve port pressure difference, QbFor instantaneous flow through the radial oil-passing bore into the oil-replenishing valve, QdFor instantaneous flow of oil outlet C of oil-filling valve, PlaFor the pressure of the hydraulic oil in the oil inlet chamber B, PdThe pressure of hydraulic oil at the spring cavity A and the oil inlet C, t is time, A (x) is the flow area of the valve port, CqIs the flow coefficient of the valve port, and rho is the hydraulic oil density.
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| CN202110362591.7A CN113074155A (en) | 2021-04-02 | 2021-04-02 | Negative pressure opening plug-in mounting type oil replenishing valve |
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| CN202110362591.7A CN113074155A (en) | 2021-04-02 | 2021-04-02 | Negative pressure opening plug-in mounting type oil replenishing valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567108A (en) * | 2021-07-09 | 2021-10-29 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
| CN114352596A (en) * | 2022-01-19 | 2022-04-15 | 上海海岳液压机电工程有限公司 | Quick-response oil replenishing valve applied to offshore pile hammer and design method |
| CN114396416A (en) * | 2022-01-07 | 2022-04-26 | 燕山大学 | Parameter sensitivity analysis method for pressure compensation system behind valve |
| CN118293047A (en) * | 2024-06-05 | 2024-07-05 | 博山水泵制造厂 | Hydrogen compressor |
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| CN107917118A (en) * | 2016-10-10 | 2018-04-17 | 罗伯特·博世有限公司 | Composite control hydraulic circuit |
| CN108266414A (en) * | 2018-01-15 | 2018-07-10 | 邵立坤 | A kind of plug-in overload oil compensating valve |
| CN212377383U (en) * | 2019-12-26 | 2021-01-19 | 靖江市新世纪液压件制造有限公司 | Oil supplementing valve |
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2021
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| US5487403A (en) * | 1987-01-29 | 1996-01-30 | Mollo; James R. | Variable discharge pump with low unload to secondary |
| US20050211308A1 (en) * | 2004-03-24 | 2005-09-29 | Sauer-Danfoss Inc. | Pressure limiting valve in a hydraulic machine and hydraulic machine having a pressure limiting valve |
| CN203685743U (en) * | 2014-01-22 | 2014-07-02 | 马鞍山市裕华机械制造有限公司 | Ejection rod control pluggable oil supplementary valve |
| CN107917118A (en) * | 2016-10-10 | 2018-04-17 | 罗伯特·博世有限公司 | Composite control hydraulic circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567108A (en) * | 2021-07-09 | 2021-10-29 | 同济大学 | Method for measuring erosion abrasion loss of valve port of slide valve |
| CN114396416A (en) * | 2022-01-07 | 2022-04-26 | 燕山大学 | Parameter sensitivity analysis method for pressure compensation system behind valve |
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| CN118293047A (en) * | 2024-06-05 | 2024-07-05 | 博山水泵制造厂 | Hydrogen compressor |
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Application publication date: 20210706 |
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| RJ01 | Rejection of invention patent application after publication |