CN-116624616-B - Balanced type quick response self-locking valve and working method

CN116624616BCN 116624616 BCN116624616 BCN 116624616BCN-116624616-B

Abstract

The invention discloses a balanced type quick response self-locking valve and a working method thereof, which solve the problems of low opening response speed and low reliability of the self-locking valve in the prior art. The invention comprises a valve body and a pilot valve, wherein the valve body is a three-way valve body, a balance motion rod is arranged in the valve body, the pilot valve is connected to the valve body through a switching disc, a piston cavity is formed among the pilot valve, the switching disc and an outlet channel B of the valve body, a piston which is arranged in a floating manner is arranged in the piston cavity, the piston is fixed at the top of the balance motion rod, the balance motion rod passes through the outlet channel B and an inlet channel of the valve body and corresponds to the outlet channel A of the valve body, and a double-valve-core assembly is arranged at the bottom of the balance motion rod. According to the invention, a medium is introduced into the piston cavity through the two-balance-cavity structure, and the medium force is different due to the fact that the upper and lower acting areas of the piston are different, so that pressure difference is generated, and the piston is driven to move through the pressure difference, so that the quick opening and closing of the double-valve-core assembly to the outlet are realized, the quick response is realized, the reliability of the self-locking valve is improved, and the effective operation of the whole system is ensured.

Inventors

SHEN BO
MO YANLIANG
LU YIN
Tian Hanwei
ZHANG WANNIAN
GE SAI
WANG YACHEN
JIA XIN
Zheng Shoubang

Assignees

河南航天液压气动技术有限公司

Dates

Publication Date: 20260508
Application Date: 20230525

Claims (9)

1. A balanced type quick response self-locking valve comprises a valve body (6) and a pilot valve (1), and is characterized in that the valve body (6) is a three-way valve body, a balanced motion rod (7) is arranged in the valve body (6), the pilot valve (1) is connected to the valve body (6) through a switching disc (2), a piston cavity is formed among the pilot valve (1), the switching disc (2) and an outlet channel B of the valve body, a floating piston (17) is arranged in the piston cavity, the piston (17) is fixed at the top of the balanced motion rod (7), the balanced motion rod (7) penetrates through the outlet channel B and an inlet channel of the valve body and corresponds to the outlet channel A of the valve body, a double-valve-core assembly for controlling the opening and closing of the outlet channel A and the outlet channel B is arranged at the bottom of the balanced motion rod (7), the piston cavity is divided into an upper piston cavity (25) and a lower piston cavity (26) through the piston (17), a piston upper and lower acting area is different, a balanced cavity structure I is correspondingly communicated with the lower piston cavity (26), a balanced cavity structure II is correspondingly communicated with the upper piston cavity (25), and a spring (5) is sleeved between the piston (17) and the outer wall of the outlet channel B; The balance motion rod (7) is internally provided with a balance cavity structure I communicated with an inlet channel and a piston cavity, the pilot valve (1) is communicated with the inlet channel through a connecting pipe (19), the switching disc (2) is provided with a balance cavity structure II communicated with the piston cavity and the pilot valve (1), a medium forms a pressure difference in the piston cavity through the balance cavity structure I and the balance cavity structure II, and the movement of the balance motion rod (7) and the double-valve core assembly is controlled through the pressure difference, so that the opening and closing of the outlet channel A and the outlet channel B are controlled.
2. The balanced quick response self-locking valve according to claim 1, wherein the double valve core assembly comprises an upper valve core assembly (8) corresponding to the outlet channel B and a lower valve core assembly (14) corresponding to the outlet channel A, and the upper valve core assembly (8) and the lower valve core assembly (14) are connected through a connecting sleeve (15) and are both fixed on the balance motion rod (7).
3. The balanced quick response self-locking valve according to claim 2, wherein O-shaped sealing rings I (9) are arranged between the upper valve core component (8) and the balance motion rod (7) and between the lower valve core component (14) and the balance motion rod (7), a limiting table (231) for limiting the upper valve core component (8) is arranged on the balance motion rod (7), the lower valve core component (14) is fixed on the balance motion rod (7) through a locking nut (11), and a first hole (24) communicated with the balance cavity structure I and an inlet channel is formed in the connecting sleeve (15).
4. The balanced quick response self-locking valve according to any one of claims 1 to 3, wherein the balanced cavity structure I comprises a balanced cavity (71), a lower radial hole (72) and an upper radial hole (73) which are communicated, the balanced cavity (71) is axially arranged along the center of a balanced motion rod (7), the lower radial hole (72) and the upper radial hole (73) are respectively arranged at the upper part and the lower part of the balanced motion rod (7), the lower radial hole (72) corresponds to an inlet channel, the upper radial hole (73) corresponds to a lower piston cavity (26), and annular grooves (74) which respectively correspond to the lower radial hole (72) and the upper radial hole (73) are arranged on the outer wall of the balanced motion rod (7).
5. The balanced quick response self-locking valve according to claim 4, wherein the balanced cavity structure II comprises a lateral discharge flow passage (21), an axial hole I (22) and an axial hole II (23), wherein the axial hole II (23) is arranged along the central axis of the adapter plate (2) and is communicated with the pilot valve (1) and the lateral discharge flow passage (21), and the axial hole I (22) is eccentrically arranged and is communicated with the pilot valve (1) and the upper piston cavity (25).
6. The balanced type quick response self-locking valve according to any one of claims 1-3 and 5, wherein an outlet joint (12) is detachably arranged at the outlet of the outlet channel A, a sealing ring II (13) is arranged between the outlet joint (12) and the valve body (6), a support (12-1) is arranged in the outlet joint (12), a shaft sleeve (12-2) for limiting a balance motion rod (7) is arranged in the center of the support (12-1), and the balance motion rod (7) is in sliding fit with the shaft sleeve (12-2).
7. The balanced quick response self-locking valve according to claim 6, wherein the piston (17) is fixed at the top of the balance motion rod (7) through a lock nut (11), a sealing ring III (16) and a sealing ring IV (18) are arranged between the piston (17) and the valve body (6), and a sealing ring V (27) is arranged between the balance motion rod (7) and the outer wall of the outlet channel B.
8. The balanced type quick response self-locking valve according to claim 7, wherein the pilot valve (1) is connected to the switching disc (2) through a bolt piece, a sealing piece I (3) is arranged between the pilot valve (1) and the switching disc (2), the switching disc (2) is connected to the valve body (6) through the bolt piece, and a sealing piece II (4) is arranged between the switching disc (2) and the valve body (6).
9. A working method of the balanced type quick response self-locking valve is characterized in that when a self-locking valve opening coil is electrified, a medium enters an inlet channel through an inlet, then a part of the medium enters a pilot valve (1) through a connecting pipe (19), the pilot valve is opened, the medium enters an upper piston cavity (25) of a piston cavity to generate forward medium force on a piston (17), the other part of the medium enters a lower piston cavity (26) of the piston cavity through a balance cavity structure I on a balance motion rod (7), reverse medium force is generated on the piston (17), when the forward medium force is larger than the reverse medium force, a forward pressure difference is generated, then a lower valve core assembly (14) of the double valve core assembly drives the double valve core assembly to move downwards, an outlet channel A is sealed, an upper valve core assembly (8) of the double valve core assembly is separated from the outlet channel B, and the outlet channel B is opened; When the locking coil of the self-locking valve is electrified, the pilot valve (1) is closed, a medium in the inlet channel enters a lower piston cavity (26) of the piston cavity through a balance cavity structure I on a balance motion rod (7), a reverse medium force is generated on the piston (17), when the reverse medium force is larger than a forward medium force, a reverse pressure difference is generated, the medium in the upper piston cavity (25) is discharged through a balance cavity structure II and pushes the piston (17) to rapidly move upwards, a lower valve core component (14) of the double valve core component is separated from an outlet channel A, the outlet channel A is opened, and meanwhile, an upper valve core component (8) of the double valve core component seals an outlet channel B, and the outlet channel B is closed; wherein, the forward pressure difference is defined as an opening force, and the reverse pressure difference is defined as a closing force; Then there is ; ; Wherein: in order for the opening force to be applied, In order for the force to be shut down, In the case of the inlet pressure being the one, Is the radius of the upper end face of the piston, Is the radius of the lower end surface of the piston, In order to balance the radius of the motion bar, Is the weight of the part and is used for the gravity of the part, In order for the force of the spring to be that of the spring, Is friction force.

Description

Balanced type quick response self-locking valve and working method Technical Field The invention relates to the technical field of self-locking valves, in particular to a balanced type quick response self-locking valve and a working method thereof. Background With the rapid development of the national defense industry, the demand for quick response self-locking valves is increasing. As an important control component in fluid delivery systems, actuators that automatically control fluids are known. The two-position three-way self-locking valve is provided with an inlet and A, B two paths of outlets. When the fluid is required to be discharged from the port A, the self-locking valve pilot valve is closed, the port A is opened, and the port B is closed, so that the two-position three-way function is realized. In some special fields, the requirement on closing response of the self-locking valve is very high, the existing self-locking valve usually utilizes spring reset to drive a piston to push a balance motion rod to realize self-locking closing of the valve, the spring cannot reset frequently, the spring force is smaller than the hydraulic force to cause piston blocking, and the increase of the spring force can cause slow opening response speed of the valve, so that the opening and closing response time of the self-locking valve cannot be optimal, and the effective operation of the whole system is influenced. Chinese patent CN113757388a discloses a pilot-operated high-pressure self-locking valve, which comprises a main valve and a pilot valve, wherein the pilot valve is communicated with a valve body, one path of gas is introduced into the pilot valve to regulate the pressure, but the gas introduced into the pilot valve is only used as a control medium to control the pilot valve, so that hydraulic balance cannot be realized in principle, and thus, the quick response of the self-locking valve cannot be realized. Chinese patent CN109695770a discloses a high reliability self-locking valve with simple structure, which comprises a valve body component, a spring, a valve seat and an armature component, and adopts an all-welded structure, so that the self-locking valve can be light, and the armature is radially provided with a through hole, but is only used as a medium circulation channel without other regulation effects. A quick response of the latching valve cannot be achieved. Disclosure of Invention Aiming at the defects in the background technology, the invention provides a balanced type quick response self-locking valve and a working method thereof, and solves the problems of low opening response speed and low reliability of the self-locking valve in the prior art. The technical scheme of the invention is realized in such a way that the balanced type quick response self-locking valve comprises a valve body and a pilot valve, wherein the valve body is a three-way valve body, and a balanced motion rod is arranged in the valve body; the pilot valve is connected to the valve body through the switching disc, a piston cavity is formed among the pilot valve, the switching disc and an outlet channel B of the valve body, a piston which is arranged in a floating manner is arranged in the piston cavity, the piston is fixed at the top of a balance motion rod, the balance motion rod passes through the outlet channel B and an inlet channel of the valve body and corresponds to the outlet channel A of the valve body, and a double-valve core assembly for controlling the opening and closing of the outlet channel A and the outlet channel B is arranged at the bottom of the balance motion rod; The balance motion rod is internally provided with a balance cavity structure I which is communicated with the inlet channel and the piston cavity, the pilot valve is communicated with the inlet channel through a connecting pipe, the switching disc is provided with a balance cavity structure II which is communicated with the piston cavity and the pilot valve, a medium forms a pressure difference in the piston cavity through the balance cavity structure I and the balance cavity structure II, and the movement of the balance motion rod and the double-valve core assembly is controlled through the pressure difference, so that the opening and closing of the outlet channel A and the outlet channel B are controlled. The double-valve core assembly comprises an upper valve core assembly corresponding to the outlet channel B and a lower valve core assembly corresponding to the outlet channel A, and the upper valve core assembly and the lower valve core assembly are connected through a connecting sleeve and are both fixed on the balance motion rod. O-shaped sealing rings I are respectively arranged between the upper valve core component and the balance motion rod and between the lower valve core component and the balance motion rod, a limiting table for limiting the upper valve core component is arranged on the balance motion rod, the lower valve core co