LU101583B1 - Combined overflow valve with pressure regulating and limiting functions - Google Patents

Combined overflow valve with pressure regulating and limiting functions Download PDF

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Publication number
LU101583B1
LU101583B1 LU101583A LU101583A LU101583B1 LU 101583 B1 LU101583 B1 LU 101583B1 LU 101583 A LU101583 A LU 101583A LU 101583 A LU101583 A LU 101583A LU 101583 B1 LU101583 B1 LU 101583B1
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LU
Luxembourg
Prior art keywords
valve
pressure
pressure regulating
limiting
valve element
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Application number
LU101583A
Other languages
French (fr)
Inventor
Chuanli Wang
Rui Shi
Haishun Deng
Tao He
Jixiang Liu
Lei Wang
Cong Hu
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Univ Anhui Sci & Technology
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Publication of LU101583B1 publication Critical patent/LU101583B1/en

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Classifications

    • 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
    • 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
    • F15B13/025—Pressure reducing valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/526—Pressure control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/56—Control of an upstream pressure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Abstract

The invention discloses a combined overflow valve with pressure regulating and limiting functions, belonging to the technical field of hydraulic overflow valves. The valve comprises a valve body, a pressure regulating valve, a pilot valve, a pressure limiting valve and an electromagnetic emergency valve. The valve body is provided with a flow channel, a valve element assembling cavity, a liquid inlet I, a liquid outlet I and a liquid outlet II. One side of the pressure regulating valve cavity is communicated with the liquid inlet I, the other side is communicated with the pilot valve through the flow channel, the pilot valve cavity is communicated with the liquid outlet II, and the pilot valve cavity is communicated with a spring cavity of the pressure regulating valve through a drainage hole. The spring pre-tightening force applied to the pilot valve can be adjusted by rotating the adjusting bolt, and the pressure limiting valve is arranged above the pressure regulating valve and is coaxial with the pressure regulating valve cavity. The main valve element of the pressure limiting valve is balanced by utilizing the hydraulic pressure on the inner side and the outer side. Once the pressure is released from one end of the pressure limiting valve, the main valve element of the pressure limiting valve can be quickly opened for pressure relief so as to ensure the safety of the system. The combined overflow valve of the invention can be used to effectively prevent the valve element resonance and automatically control the pressure abnormity; its valve body has reasonable and compact structure, and the pressure regulating valve has high working stability.

Description

Combined Overflow Valve with Pressure Regulating and LU101583 Limiting Functions Field of the Invention The invention relates to the technical field of hydraulic control valve, in particular to a combined overflow valve with pressure regulating and limiting functions, which belongs to the scope of high performance combined valves.
Background of the Invention Overflow valve is a type of indispensable pressure control valve in hydraulic transmission system, which mainly plays three roles in hydraulic system: a pressure regulating mechanism to make the hydraulic system work in a constant pressure range; a pressure limiting mechanism to maintain the hydraulic system within the maximum pressure to ensure safety; and a back-pressure mechanism which is used as internal load for buffering and braking of the hydraulic system, etc.
Pressure regulation and pressure limiting functions are the two most important functions of the overflow valve, and also indispensable components of most hydraulic systems.
When the two overflow valves are used in the hydraulic transmission system at the same time, one is used for pressure regulation and the other is used for pressure limiting.
Due to small difference between control pressures of such two valves, the spring stiffness of the two valves is similar and resonance easily occurs, thus affecting the normal operation of the hydraulic system.
The general solution in engineering is to stagger the installation positions of the two overflow valves, but the defect is that the size of the hydraulic system is increased.
Therefore, it is necessary to design a combined overflow valve with pressure regulating and limiting functions.
At present, the combined valve is formed by simply combining two overflow valves to realize the functions of multistage pressure regulation, pressure relief after pressure regulation and bidirectional pressure regulation, and the main purpose is not mainly for eliminating the resonance problem between the two.
For the most common three-purpose valve used for single coal mine hydraulic prop, only a sequencerelationship is set up between overflow and pressure relief. There is no obvious LU101583 cooperative working mechanism between the two, and such valve cannot be used for ordinary hydraulic system. Julong Group Wuhu Xinglong Hydraulic Co., Ltd. has proposed an overflow safety valve (application No.: 201610051737.5) to solve the problem of rapid overflow of the hydraulic support, and does not have pressure regulating function. The exact name of the patent should be a safety valve with rapid overflow function. Zoucheng Yikaide Hydraulic Co., Ltd. has proposed a two-way overflow valve (application No.: 201820164359.6), which can realize positive and negative pressure regulation in two directions and is simply formed by superposition of two overflow valves.
The patent application filed by the applicant in 2015 basically realizes the function of quickly opening the relief valve when the overflow valve exceeds its rated flow rate, but does not realize the function of stabilizing the pressure by the relief valve when the overflow valve normally works. At the same time, the patent also has the following disadvantages: 1) it is difficult to design the flow channel of the valve body which is difficultly machined through a complicated process; 2) machining holes are arranged in the main valve element, which are not easily machined; 3) the main valve, pilot valve and safety valve are arranged in parallel, and the valve body is big; 4) the emergency process of Example 1 and the safety process of Example 2 show the process of manually rotating the emergency pin to start the emergency process and safety process, which may have human error; 5) the safety valve and the main valve are arranged in parallel, and the safety valve has no effect on the fast stability of the main valve.
Therefore, the main purpose of the invention is to realize the cooperative operation of the pressure regulating valve and the pressure limiting valve (the pressure limiting valve is helpful for fast pressure stabilization during pressure regulation; and the pressure regulating valve is helpful for fast pressure relief during pressure limiting), and further optimize the structure and performance of the combined valve.
Summary of the Invention LU101583 For the defects of the prior art, the invention discloses a combined overflow valve with pressure regulating and limiting functions, which can solve the resonance problem when two relief valves are used at the same time and construct a cooperative working mechanism between the two, in particular a mechanism that the pressure limiting valve assists the pressure regulating valve in stable operation, thereby further improving the pressure regulating and limiting performance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a combined overflow valve with pressure regulating and pressure limiting functions, comprising a valve body, a pressure regulating valve, a pilot valve, a pressure limiting valve and an electromagnetic emergency valve; the valve body is provided with a flow channel, a valve element assembling cavity, a liquid inlet I, a liquid outlet I and a liquid outlet II; wherein one side of the pressure regulating valve is communicated with the liquid inlet I, the other side is communicated with the pilot valve through the flow channel, the pilot valve is communicated with the liquid outlet II, and the pilot valve cavity is communicated with a spring cavity of the pressure regulating valve through a flow channel; the spring pre-tightening force applied to the pilot valve can be adjusted by rotating the adjusting bolt; the pressure limiting valve is arranged above the pressure regulating valve and is coaxial with the pressure regulating valve cavity; the pressure limiting valve is communicated with the liquid outlet II by the flow channel, and a damping hole II is arranged on the main valve element of the pressure limiting valve, and the main valve element of the pressure limiting valve is balanced by utilizing the hydraulic pressure on the inner side and the outer side. Once the pressure is released from one end of the pressure limiting valve, the main valve element of the pressure limiting valve can be quickly opened to release pressure so as to ensure the safety of the system.
Preferably, the main valve element of the pressure regulating valve is composed of a cone valve element, an extension rod, a damping hole I and an annular groove, the damping hole I is arranged on the flanges on both sides of the main valve elementof the pressure regulating valve and is symmetrical to the centerline of the main valve LU101583 element of the pressure regulating valve; and the annular groove is arranged on the extension rod.
Preferably, for the flange and extension rod, the lower lateral area of the flange is Aw, the upper lateral area of the flange is Az, the end area of the extension rod is As, and A) is approximately equal to A2+ A3; piA1=p2A2 +p3As in case of static balance, and the hydraulic force F acting on the end of the extension rod is equal to psA3 which can offset the fluctuating value of the main valve element part of the pressure regulating valve.
Preferably, the main valve element of the pressure regulating valve is axially provided with the liquid outlet I, the cone valve element is arranged far from the liquid inlet I, and one end is inserted into the liquid outlet I and can slide in the axial direction of the liquid outlet I.
Preferably, the pilot valve has a pre-tightening mechanism comprising a pilot spring and an adjusting bolt for applying a pre-tightening force to the pilot spring and adjusting the position along the axial direction of the valve body.
Preferably, the pressure limiting valve comprises a pressure limiting spring and the main valve element of the pressure limiting valve, one end of the pressure limiting spring is in contact with the valve body, the other end is connected with the main valve element of the pressure limiting valve; and the main valve element of the pressure limiting valve is provided with a damping hole IT.
Preferably, the diameter of the pressure regulating valve inlet port is smaller than that of the pressure limiting valve inlet port.
Preferably, the main valve element of the pressure regulating valve is installed in the valve body which has an assembling cavity matched with the shape of the main valve element of the pressure regulating valve.
Preferably, the combined overflow valve is provided with the electromagnetic emergency valve, and the electromagnetic emergency valve (5) is arranged on the flow channel between the pressure limiting valve cavity and the liquid outlet IT.
Compared with the prior art, the invention, including the existing LU101583 dual-overflow valve combination and the patent mentioned (an overflow valve with pressure regulation and safety functions with application number of 201510898227 .7), has the following beneficial effects: 5 1) The resonance of the valve element is effectively avoided. Due to low elastic modulus of the main valve element springs of the pressure regulating valve and the pressure limiting valve and high elastic modulus of the valve element spring of the pilot valve, the valve element resonance caused by the approximately equal control pressure of the traditional dual-overflow valve is effectively avoided.
2) Rational and compact structure. As the pressure regulating valve, the pressure limiting valve and the pilot valve are integrated together, the pilot valve and the pressure limiting valve are respectively arranged on the left side and the upper side of the main valve element of the pressure regulating valve in parallel, and the middle parts of the pressure regulating valve and the pressure limiting valve are communicated with each other through a flow channel, and a liquid inlet is shared, so that the structure is more reasonable and compact.
3) Abnormal automatic control pressure. The combined overflow valve is provided with an electromagnetic emergency valve, which can be operated in case of an emergency to ensure the safety of the system pressure. Compared with manual rotation of the emergency pin, the manual operation error is reduced to operate the emergency valve more safely, quickly and accurately, so as to relieve pressure and stabilize the system pressure, and ensure the safety and stability of the system pressure.
4) High pressure regulating stability. The pressure with the same pulsating quantity or fluctuating quantity on both ends of the main valve element of the pressure regulating valve is used to improve the stability of the main valve element of the pressure regulating valve, reduce the flow impact of the pilot valve and improve the pressure regulating stability. As the lower lateral area of the flanges on both sides of the main valve element of the pressure regulating valve is A1, the upper lateral area of the flange is A2, and the end area of the extension rod is As, a balance relationship isformed: 41 > A> and A1= A2 + A3. The hydraulic pressure applied by the liquid in the LU101583 pressure limiting valve cavity to the end area A3 of the extension rod for the main valve element of the pressure regulating valve can help improve the steady-state performance of the main valve element of the pressure regulating valve and the fast stability when the pressure regulating valve element works.
Brief Description of the Drawings | In order to more clearly describe the embodiments of the invention or the technical solution in the prior art, the embodiments or drawings used in technical description will be simply introduced as follows.
Apparently, the drawings described below are only some embodiments of the invention.
Those of ordinary skill in the art can obtain other drawings based on these drawings without creative work.
Fig. 1 is a front view of Example 1 of the invention.
Fig. 2 is a sectional view of A-A in Fig. 1; Fig. 3 is a sectional view of B-B in Fig. 1; Fig. 4 is a sectional view of C-C in Fig. 1; Fig. 5 is a top view of Example 1 of the invention.
Fig. 6 is a sectional view of D-D in Fig. 5; Fig. 7 is a state diagram of an overflow valve in the pressure limiting process of Example 1; Fig. 8 is a local enlarged view of Q in Fig. 7; Fig. 9 is a stereogram of a valve body of Example 1; Fig. 10 is a sectional view of the main valve element of the pressure regulating valve; Fig. 11 is a diagram showing the pressure applied to the main valve element of the pressure regulating valve; Fig. 12 is a stereogram of the main valve element of the pressure regulating valve; Fig. 13 is a top view of Example 2; Fig. 14 is a sectional view of E-E in Fig. 13;
Fig. 15 is a front view of Example 2; LU101583 Fig. 16 is a sectional view of F-F in Fig. 15; In the figures: 1. Valve body, 2. Pressure regulating valve, 3. Pilot valve, 4. Pressure limiting valve, 5. Electromagnetic emergency valve, 11. Liquid inlet I, 12.
Flow channel I, 13. Liquid outlet I , 14. Flow channel II, 15. Flow channel III, 16. Flow channel IV, 17. Liquid outlet II, 18. Flow channel V, 121. Oil chamber, 122. Liquid inlet II, 123. Liquid outlet III, 21. Main valve element of pressure regulating valve, 22. Pressure regulating spring, 23. Damping hole I, 24. Annular groove, 31. Pilot valve element, 32. Pilot spring, 33. Adjusting bolt, 41. Main valve element of pressure limiting valve, 42. Damping hole II, 43. Pressure limiting spring, 44. Plug,
51. Electromagnetic valve element, 52. Electromagnetic valve spring.
Detailed Description of the Preferred Embodiment In order to described objectives, technical scheme and advantages of the embodiments of the invention more clearly, the technical scheme in the embodiments of the invention will be described clearly and completely in combination with the figures of the embodiments as follows. Apparently, the embodiments described are some but not all embodiments of the invention. Based on the examples of the invention, all other examples obtained without creative work by those of ordinary skill in the art shall fall within the protection scope of the invention. Based on the examples of the invention, all other examples obtained by those skilled in the art without creative work fall within the protection scope of the invention. Example 1 As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 6 and Fig. 11, a combined overflow valve with pressure regulating and pressure limiting functions in this example comprises a valve body 1, a pressure regulating valve 2, a pilot valve 3, a pressure limiting valve 4 and an electromagnetic emergency valve 5; one side of the pressure regulating valve 2 is communicated with the liquid inlet I, the other side is communicated with the pilot valve 3 through the flow channel II, the pilot valve cavity 3 is communicated with the liquid outlet II, and the pilot valve cavity is communicated with a spring cavity of thepressure regulating valve through a flow channel; the spring pre-tightening force LU101583 applied to the pilot valve 3 is adjusted by rotating the adjusting bolt; the pressure limiting valve 4 is arranged above the pressure regulating valve and is coaxial with the main valve cavity of the pressure regulating valve; the pressure limiting valve 4 is communicated with the liquid outlet II by the flow channel, and a damping hole II is arranged on the main valve element of the pressure limiting valve; and the main valve element of the pressure limiting valve is balanced by utilizing the hydraulic pressure on the inner side and the outer side.
It can be divided into three operating processes: pressure regulating process, pressure limiting process and emergency pressure relief process.
The working principle of the pressure regulating process: @® Stage from zero pressure to opening of the pilot valve.
The fluid flows into the valve body 1 from the liquid inlet I 11 and then divides into two paths.
One path of fluid enters the lower cavity of the flange for the main valve element 21 of the pressure regulating valve to form a pressure p1 which acts on the lower side of the flange for the main valve element 21 of the pressure regulating valve, with an action area of A1. Then, the fluid enters the upper cavity of the flange for the main valve element 21 of the pressure regulating valve through the damping hole I 23 to form a pressure p2 which acts on the upper side of the flange for the main valve element 21 of the pressure regulating valve, with an action area of Az.
The other path of fluid enters the spring cavity of the pressure limiting valve through the damping hole II 42 to form a pressure ps.
In the initial stage, the pressure at the liquid inlet I 11 is relatively low.
At this time, the pressure limiting valve is not opened and the fluid is in a static state.
Static pressure is formed at the internal and external sides of the main valve element of the pressure limiting valve 41. The main valve element of the pressure limiting valve 41 is kept closed at static pressure and under the action of the pressure limiting spring 43. The pressure ps in the spring cavity of the pressure limiting valve acts on the extension rod end of the main valve element of the pressure regulating valve 21, with an action area As.
In the initial stage, the pressure at the liquid inlet I 11 is relatively low.
The fluid in the upper cavity of the flange for themain valve element 21 of the pressure regulating valve acts on the pilot valve element LU101583 31 through the flow channel II 14. At this time, the hydraulic pressure acting on the pilot valve element 31 is less than the specified pressure of the pilot spring 32. The pilot valve element 31 is kept closed under the action of spring force, and the fluid on the upper and lower sides of the flange for the main valve element of the pressure regulating valve 21 is static flow, so the static pressure p2 is equal to ps.
The main valve element 21 of the pressure regulating valve is kept closed under the action of hydraulic pressure F= p3 As, spring force for pressure regulation Fı and dead load, and the liquid outlet I 13 is not opened.
The balance of the main valve element 21 of the pressure regulating valve is different from that of a common pilot overflow valve.
As shown in Fig. 6, Fig. 11 and Fig. 12, the lower lateral area of the flange for the main valve element of the pressure regulating valve is A1, the static pressure is pl, the lower lateral area of the flange is Az, the static pressure is p2, the area for the extension rod end of the main valve element of the pressure regulating valve is As, and the static pressure is ps.
The main valve element of the pressure regulating valve is subjected to the action of three end surface hydrostatic pressures piAi, p2A2, psA3 and the spring force for pressure regulation Fy, with the static balance equation: prA1= p2A2+ p3A3+Fı.
As the hydraulic pressure ps on the end surface A3 and the inlet pressure p1 are based on the same fluctuation rule, the pressure fluctuation at the inlet can be partially offset to improve the pressure stabilizing performance of the combined overflow valve with pressure regulating and limiting functions. © Stage after the pilot valve is opened.
When the pressure of the liquid inlet I 11 increases and the fluid pressure on the upper side of the flange for the main valve element of the pressure regulating valve 21 is greater than the specified pressure of the pilot valve spring 32 but less than the pressure limit, the pilot valve element 31 is opened against the specified pressure of the pilot spring 32 under the action of the hydraulic pressure, and the fluid on the upper side of the flange for the main valve element of the pressure regulating valve 21 enters the pilot valve spring cavity, the spring cavity of the pressure regulating valve and the liquid outlet II 17 through the flow channel 14, and then flows into the oiltank.
At this time, under the blocking effect of the damping hole I 23 on the main LU101583 valve element of the pressure regulating valve 21, the fluid pressure p2 on the upper side of the flange for the main valve element of the pressure regulating valve 21 is reduced to be lower than the fluid pressure pl on the lower side of the flange, the pressure difference À p is formed between the upper and the lower sides of the flange for the main valve element of the pressure regulating valve 21, the main valve element of the pressure regulating valve 21 can be opened against the end liquid pressure F= p3 As, the pressure regulating spring force Fi and the dead load of the extension rod for the main valve element of the pressure regulating valve under the action of the pressure difference A p, the liquid outlet I 13 is opened, and the fluid flows into the oil tank from the liquid outlet I 13, thus realizing the pressure regulation mechanism.
At this time, the opening of the main valve element of the pressure regulating valve 21 is small, no channel is formed between the annular groove 24 of the extension rod for the main valve element of the pressure regulating valve and the valve body 1, and the spring cavity of the pressure limiting valve is not communicated with the spring cavity of the pressure regulating valve.
At this stage, no matter how the inlet pressure fluctuates, the valve openness of the main valve element of the pressure regulating valve 21 can be adjusted through the pressure difference, thereby maintaining the stability of the outlet pressure.
As the hydraulic pressure p3 on the end surface A3 and the pressure pi on the lower side of the flange for the main valve element of the pressure regulating valve have the same fluctuation rule, the fluctuation of the inlet pressure can be partially offset to improve the stability performance of the main valve element of the pressure regulating valve.
Pressure limiting process: When the pressure of the liquid inlet I 11 reaches the specified pressure of the pressure limiting valve, the main valve element of the pressure regulating valve 21 moves to the uppermost end against the end liquid pressure F= p3 A3, the pressure regulating spring force Fı and the dead load of the extension rod for the main valve element of the pressure regulating valve under the action of the hydraulic pressure, the annular groove 24 on the extension rod of the main valve element of the pressure regulating valve 21 forms a channel with the valve body 1, so the spring cavity of the pressure limiting valve is communicated with thespring cavity of the pressure regulating valve, and fluid in the spring cavity of the LU101583 pressure limiting valve enters the spring cavity of the pressure regulating valve through the annular groove 24, then flows to the spring cavity of the pilot valve and enters the oil tank from the liquid outlet II 17. Under the blocking effect of the damping hole II 42 on the main valve element of the pressure limiting valve 41, the fluid pressure ps inside the main valve element of the pressure limiting valve 41 is reduced to a low pressure which is lower than the fluid pressure p; at the liquid inlet I 11 of the main valve element of the pressure limiting valve 41. A pressure difference is formed between the internal and external sides of the main valve element of the pressure limiting valve 41. The main valve element of the pressure limiting valve 41 will be opened against the pressure limiting spring force Fu under the action of the pressure difference. The fluid at the inlet of the main valve element of the pressure limiting valve 41 flows into the pilot valve cavity through the flow channel III 15 and then flows into the oil tank through the liquid outlet II 17. The main valve element of the pressure limiting valve 41 is rapidly opened for pressure relief to ensure the safety and stability of the system and realize the pressure limiting mechanism.
Emergency pressure relief process: When the inlet pressure of the system is too high and exceeds the pressure relief range of the overflow valve or in case of emergency, the electromagnetic emergency valve 5 can be operated, so the spring cavity of the pressure limiting valve can be communicated with the flow channel of the liquid outlet II 17, the fluid in the spring cavity of the pressure limiting valve flows into the oil tank from the liquid outlet II 17 through the flow channel. Under the blocking effect of the damping hole II 42 on the main valve element of the pressure limiting valve 41, the fluid pressure p3 inside the main valve element of the pressure limiting valve 41 is reduced to a low pressure which is lower than the fluid pressure p1 at the liquid inlet I 11 of the main valve element of the pressure limiting valve 41. A pressure difference is formed between the internal and external sides of the main valve element of the pressure limiting valve 41. The main valve element of the pressure limiting valve 41 will be opened against the pressure limiting spring force Fu under the action of the pressure difference. The inlet fluid. from the main valve element of the pressure limiting valve flows into the pilot valve cavity through theflow channel III 15 and then flows into the oil tank through the liquid outlet II 17, so LU101583 as to achieve the purpose of fast pressure relief and prevent the phenomenon that the pressure of the combined overflow valve system is continuously increased, thus achieving the function of emergency protection and ensuring the safety and stability ofthe overflow valve.
Example 2 | Fig. 6 and Fig. 13 show two different realization modes of the pressure limiting function of the combined overflow valve with pressure regulating and limiting functions. The basic ideas are the same, and the opening of the pressure limiting valve is controlled by the displacement of the main valve element of the pressure regulating valve.
As shown in Fig. 11, Fig. 13, Fig. 14 and Fig. 15, a combined overflow valve with pressure regulating and pressure limiting functions in this example comprises five parts: the valve body, the pressure regulating valve, the pilot valve, the pressure limiting valve and the electromagnetic emergency valve. The main valve element of the pressure limiting valve 41 and the main valve element of the pressure regulating valve 21 are vertically arranged. The valve body is provided with the liquid inlet I 11, the liquid inlet IF 122, the liquid outlet I 13, the liquid outlet II 17 and the liquid outlet III 123. The electromagnetic emergency valve 5 is arranged between the oil chamber 121 and the liquid outlet III 123. The pilot valve 3 is communicated with the liquid outlet II 17, and the pressure limiting valve 4 is communicated with the liquid outlet III 123. It can be divided into three operating processes: pressure regulating process, pressure limiting process and emergency pressure relief process.
The working principle of the pressure regulating process: (DStage from zero pressure to the timeline before the pilot valve is opened The fluid enters the lower cavity of the flange for the main valve element of the pressure regulating valve 21 from the liquid inlet I 11 to form a pressure p; which acts on the lower side of the flange for the main valve element 21 of the pressure regulating valve, with an action area of Aj. Then, the fluid enters the upper cavity of the flange for the main valve element 21 of the pressure regulating valve through thedamping hole I 23 to form a pressure p2 which acts on the upper side of the flange for LU101583 the main valve element 21 of the pressure regulating valve, with an action area of Az.
The fluid enters the pressure limiting valve cavity through the damping hole II 42 to form a pressure ps.
In the initial stage, the pressure at the liquid inlet I 122 is relatively low.
At this time, the pressure limiting valve is not opened and the fluid is in a static state.
Static pressure is formed at the internal and external sides of the main valve element of the pressure limiting valve 41. The main valve element of the pressure limiting valve 41 is kept closed at static pressure and under the action of the pressure limiting spring 43. The pressure ps in the spring cavity of the pressure limiting valve acts on the extension rod end of the main valve element of the pressure regulating valve 21, with an action area A3. In the initial stage, the pressure at the liquid inlet I 11 is relatively low.
The fluid in the upper cavity of the flange for the main valve element 21 of the pressure regulating valve acts on the pilot valve element 31 through the flow channel II 14. At this time, the fluid pressure acting on the pilot valve element 31 is less than the specified pressure of the pilot spring 32. The pilot valve element 31 is kept closed under the action of spring force, and the fluid on the upper and lower sides of the flange for the main valve element of the pressure regulating valve 21 is static flow, so the static pressure pz is equal to ps.
The main valve element of the pressure regulating valve 21 is kept closed under the action of the end liquid pressure F= p3 A3, the pressure regulating spring force Fr and the dead load of the extension rod for the main valve element of the pressure regulating valve 21, and the liquid outlet I 13 is not opened. | The balance of the main valve element 21 of the pressure-regulating valve is different from that of a common pilot overflow valve.
As shown in Figure 6, Figure 11 and Figure 12, the lower lateral area of the flange for the main valve element of the pressure-regulating valve is A1, the static pressure is p1, the lower lateral area of the flange is Az, the static pressure is pz, the area for the extension rod end of the main valve element of the pressure-regulating valve is A3, and the static pressure is p3. The main valve element of the pressure-regulating valve is subjected to the action of three end surface hydrostatic pressures piAi, p2A2, p3A3 and the spring force for pressureregulation F;, with the static balance equation: p1A1= pz2az+ p3As+F:. As the hydraulic LU101583 pressure p3 on the end surface A3 and the inlet pressure p; are based on the same fluctuation rule, the pressure fluctuation at the inlet can be partially offset to improve the pressure stabilizing performance of the combined overflow valve with pressure-regulating and limiting functions. @Stage after the pilot valve is opened.
When the pressure of the liquid inlet I 11 increases and the fluid pressure on the upper side of the flange for the main valve element of the pressure regulating valve 21 is greater than the opening pressure of the pilot valve 3 and less than the pressure limit, the pilot valve element 31 is opened under the action of hydraulic pressure.
The fluid in the flow channel 14 and the in the upper side of the flange for the main valve element of the pressure regulating valve flows into the oil tank from the liquid outlet II 17. Under the block action of the damping hole I 23 on the main valve element of the pressure regulating valve 21, the fluid pressure p2 on the upper side of the flange for the main valve element of the pressure regulating valve 21 is reduced to be lower than the fluid pressure pi on the lower side of the flange, the pressure difference Ap is formed between the upper and the lower sides of the flange for the main valve element of the pressure regulating valve 21, the main valve element of the pressure regulating valve 21 can be opened against the end liquid pressure F= p3 As, the pressure regulating spring force F: and the dead load of the extension rod for the main valve element of the pressure regulating valve under the action of the pressure difference Ap, the liquid outlet I 13 is opened, and the fluid flows into the oil tank from the liquid outlet I 13, thus realizing the pressure regulation mechanism.
At this time, the opening of the main valve element of the pressure regulating valve 21 is small, no channel is formed between the annular groove 24 on the extension rod of the main valve element of the pressure regulating valve and the valve body 1, and the oil chamber 121 is not communicated with the spring cavity of the pressure regulating valve.
At this stage, no matter how the inlet pressure fluctuates, the valve openness of the main valve element of the pressure regulating valve 21 can be adjusted through the pressure difference, thereby maintaining the stability of the outlet pressure.
Pressure limiting process: When the pressure of the liquid inlet is more than the LU101583 pressure limit, the main valve element of the pressure regulating valve 21 moves to the top, the annular groove 24 on the extension rod of the main valve element of the pressure regulating valve 21 forms a channel with the valve body 1, and the fluid in the oil chamber 121 enters the spring cavity of the pressure regulating valve and then flows into the oil tank from the liquid outlet II 17 through the flow channel 18. Under the blocking effect of the damping hole II 42 on the main valve element of the pressure limiting valve 41, the fluid pressure p3 inside the main valve element of the pressure limiting valve 41 is reduced to a low pressure which is lower than the fluid pressure pi at the liquid inlet II 122 of the main valve element of the pressure limiting valve 41. A pressure difference is formed between the internal and external sides of the main valve element of the pressure limiting valve 41. The main valve element of the pressure limiting valve 41 will be opened against the pressure limiting spring force Fu under the action of the pressure difference.
The fluid from the liquid inlet II 122 rapidly flows out through the liquid outlet III 123. The main valve element of the pressure limiting valve 41 is rapidly opened for pressure relief to ensure the safety and stability of the system and realize the pressure limiting mechanism.
Emergency pressure relief process: When the inlet pressure of the system is too high and exceeds the pressure relief range of the overflow valve or in case of emergency, the electromagnetic emergency valve 5 can be operated to open the flow channel between the oil chamber 121 and the liquid outlet III 123, so the fluid in the oil chamber 121 and the spring cavity of the pressure limiting valve flows into the oil tank through the oil outlet III 123. Under the blocking effect of the damping hole II 42 on the main valve element of the pressure limiting valve 41, the fluid pressure ps inside the main valve element of the pressure limiting valve 41 is reduced to a low pressure which is lower than the fluid pressure pı at the liquid inlet I 122 of the main valve element of the pressure limiting valve 41. A pressure difference is formed between the internal and external sides of the main valve element of the pressure limiting valve 41.The main valve element of the pressure limiting valve 41 will be opened against the pressure limiting spring force Fu under the action of the pressuredifference.
The fluid from the liquid inlet II 122 rapidly flows out through the liquid LU101583 outlet III 123, so as to achieve the purpose of fast pressure relief and prevent the phenomenon that the pressure of the overflow valve system is continuously increased, thus ensuring the safety and stability of the overflow valve.

Claims (9)

CLAIMS LU101583
1. A combined overflow valve with pressure regulating and limiting functions, comprising a valve body (1), a pressure regulating valve (2), a pilot valve (3), a pressure limiting valve (4) and an electromagnetic emergency valve (5); the valve body (1) being provided with a flow channel, a valve element assembling cavity, a liquid inlet I (11), a liquid outlet I (13) and a liquid outlet II (17); one side of the pressure regulating valve (2) being communicated with the liquid inlet I (11), the other side being communicated with the pilot valve (3) through the flow channel II (14), the pilot valve cavity (3) being communicated with the liquid outlet II (17), and the pilot valve cavity being communicated with a spring cavity of the pressure regulating valve through a drainage hole; the spring pre-tightening force applied to the pilot valve being adjusted by a rotating the adjusting bolt (33), and the pressure limiting valve (4) being arranged above the pressure regulating valve (2) and being coaxial with the pressure regulating valve cavity; the pressure limiting valve being communicated with the liquid outlet II (17) by the flow channel, and a damping hole II (42) being arranged on the main valve element of the pressure limiting valve (41); and the main valve element of the pressure limiting valve (41) being balanced by utilizing the hydraulic pressure on the inner side and the outer side.
2. The combined overflow valve with pressure regulating and limiting functions according to claim 1, characterized in that the main valve element of the pressure regulating valve is composed of a cone valve element, a flange, an extension rod, a damping hole I (23) and an annular groove (24), the damping hole I (23) is arranged on the flanges on both sides of the main valve element of the pressure regulating valve (21) and is symmetrical to the centerline of the main valve element of the pressure regulating valve (21); and the annular groove (24) is arranged on the extension rod.
3. The combined overflow valve with pressure regulating and limiting functions according to claim 2, characterized in that the lower lateral area of the flange is A1, the upper lateral area of the flange is Az, the end area of the extension rod is As, and A1 is approximately equal to A2+ As; piA1=p2A2 +psA3 in case of static balance, and the hydraulic force F acting on the end of the extension rod is equal to p3A3 which canoffset the fluctuating value of the main valve element part of the pressure regulating LU101583 valve.
4. The combined overflow valve with pressure regulating and limiting functions according to claim 2, characterized in that the main valve element of the pressure regulating valve (21) is axially provided with the liquid outlet I (13), the cone valve element is arranged far from the liquid inlet I (11), and one end is inserted into the with the liquid outlet I (13) and can slide in the axial direction of the liquid outlet I (13).
5. The combined overflow valve with pressure regulating and limiting functions according to claim 1, characterized in that the pilot valve (3) has a pre-tightening mechanism, comprising a pilot spring (32) and an adjusting bolt (33) for applying a pre-tightening force to the pilot spring (32) and adjusting the position along the axial direction of the valve body (1).
6. The combined overflow valve with pressure regulating and limiting functions according to claim 1, characterized in that the pressure limiting valve comprises a pressure limiting spring (43) and the main valve element of the pressure limiting valve (41), one end of the pressure limiting spring (43) is in contact with the valve body (1), the other end is connected with the main valve element of the pressure limiting valve (41); and the main valve element of the pressure limiting valve (41) is provided with a damping hole II (42).
7. The combined overflow valve with pressure regulating and limiting functions according to claim 5, characterized in that the pressure limiting valve cavity is coaxial with the spring cavity of the pressure regulating valve and communicated up and down through a flow channel; and the pressure limiting valve cavity and the electromagnetic emergency valve (5) are communicated with the liquid outlet II (17) through a flow channel.
8. The combined overflow valve with pressure regulating and limiting functions according to claim 7, characterized in that the main valve element of the pressure regulating valve (21) is arranged in the valve body (1) which has an assembling cavitymatched with the shape of the main valve element of the pressure regulating valve LU101583 (21). |
9. The combined overflow valve with pressure regulating and limiting functions according to claim 1, characterized in that the combined overflow valve is provided with the electromagnetic emergency valve (5), and the electromagnetic emergency valve (5) is arranged on the flow channel between the pressure limiting valve cavity and the liquid outlet IT (17).
LU101583A 2019-03-05 2019-12-30 Combined overflow valve with pressure regulating and limiting functions LU101583B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910164757.7A CN109854563B (en) 2019-03-05 2019-03-05 Pressure regulating and limiting combined overflow valve

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LU101583B1 true LU101583B1 (en) 2020-09-18

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Application Number Title Priority Date Filing Date
LU101583A LU101583B1 (en) 2019-03-05 2019-12-30 Combined overflow valve with pressure regulating and limiting functions

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LU (1) LU101583B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113236622B (en) * 2021-05-28 2023-05-30 北京天玛智控科技股份有限公司 Constant-difference overflow valve and intelligent power generation hydraulic system

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CA971459A (en) * 1971-12-29 1975-07-22 Hikaru Murata Hydraulic control valve
CN1026256C (en) * 1991-07-02 1994-10-19 浙江瑞安永久机电研究所 Separative self controlling valve
CN2236039Y (en) * 1995-11-10 1996-09-25 施光林 Hydraulic-controlled unloading overflow valve group
CN2729385Y (en) * 2004-08-04 2005-09-28 浙江大学 Pure water hydraulic unload relief valve
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CN109854563A (en) 2019-06-07

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Effective date: 20200918