CN113581146A - Automatic stop valve capable of controlling oil leakage - Google Patents
Automatic stop valve capable of controlling oil leakage Download PDFInfo
- Publication number
- CN113581146A CN113581146A CN202110850098.XA CN202110850098A CN113581146A CN 113581146 A CN113581146 A CN 113581146A CN 202110850098 A CN202110850098 A CN 202110850098A CN 113581146 A CN113581146 A CN 113581146A
- Authority
- CN
- China
- Prior art keywords
- oil
- sleeve
- valve
- hole
- boss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/28—Valves specially adapted therefor
- B60T11/32—Automatic cut-off valves for defective pipes
- B60T11/323—Automatic cut-off valves for defective pipes in hydraulic systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/32—Alighting gear characterised by elements which contact the ground or similar surface
- B64C25/42—Arrangement or adaptation of brakes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Safety Valves (AREA)
Abstract
The automatic stop valve capable of controlling oil leakage is characterized in that the end face of an oil outlet end of a moving valve is attached to the end face of an oil inlet end of a flow dividing valve, and a plug is positioned in the moving valve and close to the oil inlet end. The stopper is arranged at the oil outlet end, and the plug screw is arranged at the oil inlet end; the central hole of the screw plug is an oil inlet hole. The sleeve is positioned between the limiter and the screw plug. The shunt valve assembly is positioned in the sleeve; one end of the reset spring is arranged in a reset spring mounting groove on the inner end surface of the limiter, and the other end of the reset spring is attached to the end surface of the oil outlet end of the shunt valve. The valve is arranged at the bottom of the oil inlet end of the shunt valve and is in sliding fit with the sleeve; the limiting block is arranged at the opening part of the oil inlet end of the shunt valve; the limiting block is sleeved with a spring. The invention is arranged at the front end of the airplane wheel, when the cylinder seat of the airplane wheel is damaged and oil leaks, the oil way can be automatically cut off after the oil flows through the oil with the designed volume of the stop valve, thereby effectively avoiding the continuous leakage of the oil in a hydraulic pipeline and ensuring the safe landing of the airplane.
Description
Technical Field
The invention relates to the field of hydraulic brake systems of airplanes, in particular to a valve which is used for the hydraulic brake systems of airplanes and can effectively prevent oil leakage of hydraulic pipelines of airplanes.
Background
The hydraulic brake system of the airplane is an important component for ensuring that the airplane can land safely, and the brake pressure in the braking process of the airplane is realized by the pressure of oil. The volume of aircraft hydraulic pressure source is limited, takes place the damaged condition that appears fluid and reveal when the cylinder block of aircraft wheel, can lead to aircraft oil source pressure to reduce, and then whole hydraulic braking system brake pressure is low or even the brake does not have pressure, finally leads to the aircraft to take place extremely dangerous condition when landing.
The existing stop valve is a forced sealing type valve, the opening and closing part is a plug-shaped valve clack, and when the valve is closed and an oil way is cut off, an operating force must be manually applied to the valve clack inside the valve body to overcome the friction force generated by internal parts and the thrust force generated by the pressure of a medium. When an airplane is braked during landing, if a cylinder seat of an airplane wheel is damaged, oil leakage occurs, and in the case, the leaked oil way cannot be cut off through manual operation. The valve clack moves linearly along the valve body under the action of manual operation force, and when the conical surface of the valve clack is tightly attached to the conical surface of the valve seat, the medium flow is cut off. The closing of the shut-off valve is effected by different operating speeds of the person, the volume of the medium flowing through the valve body during the closing process not being a constant value.
Disclosure of Invention
The invention provides an automatic stop valve capable of controlling oil leakage, which aims to prevent the situation that oil leakage occurs due to the fact that a wheel cylinder seat is damaged when an airplane is braked during landing and overcome the defects that an oil way cannot be automatically cut off due to manual operation of the existing stop valve and the volume of a medium flowing through a valve body is uncontrollable in the closing process.
The invention comprises a shell, a plug screw, a supporting sleeve, a throttle plate, a supporting seat, a floating valve assembly, a shunt valve assembly, a sleeve, a return spring and a limiter. Wherein: the shunt valve assembly comprises a limiting block, a steel wire check ring for holes, a spring, a valve and a shunt valve, the valve and the limiting block are located in the shunt valve, and the spring is arranged between the valve and the limiting block. And a steel wire check ring for holes is arranged between the outer circumferential surface of the large outer diameter section of the stop block and the shunt valve. The floating valve component comprises a floating valve, a plug, a stop ring and a sealing ring. And the moving valve is positioned in the sleeve, so that the end surface of the oil outlet end of the moving valve is attached to the end surface of the oil inlet end of the shunt valve. The plug is positioned in the moving valve and is positioned at the position, close to the oil inlet end, of the moving valve. A stop ring and a seal ring are arranged between the outer circumferential surface of the plug and the inner circumferential surface of the floating valve. The stopper is arranged in the shell and positioned at the oil outlet end of the shell, and the plug screw is arranged in the shell and positioned at the oil inlet end of the shell; the central hole of the screw plug is an oil inlet hole. The sleeve is positioned in the shell and is positioned between the limiter and the screw plug; the outer surface of the middle part of the sleeve is in sealing fit with the inner surface of the shell. The shunt valve assembly is positioned in the sleeve; one end of a return spring is arranged in a return spring mounting groove on the inner end face of the arrester, and the other end of the return spring is attached to the end face of the oil outlet end of the shunt valve in the shunt valve assembly. The valve is arranged at the bottom of the oil inlet end of the shunt valve, and the valve is in sliding fit with the sleeve; the limiting block is arranged at the opening part of the oil inlet end of the shunt valve, and the positioning plate at the outer end of the limiting block is fixedly matched with the shunt valve through a hole by a steel wire check ring; the block body of the stop block is sleeved with a spring, and one end of the spring is arranged in the valve.
The moving valve is in a circular cylinder shape with one closed end. The outer diameter of the floating valve is the same as the inner diameter of the sleeve, and the floating valve and the sleeve are in clearance fit. Three annular pressure equalizing grooves are distributed on the outer circumferential surface of the floating valve. The outer edge of the outer end face of the closed end of the floating valve is a 90-degree conical surface which is used for being matched with the 90-degree conical surface in the middle section of the sleeve to realize sealing matching between the two, so that the function of cutting off an oil way is achieved. The inner circumferential surface of the floating valve close to the opening end is provided with a step, and the end surface of the step is a positioning surface for blocking; there is a mounting groove of the stop ring at one side of the step. The traveling gate is axially movable within the sleeve. The annular pressure equalizing groove on the outer circumferential surface can prevent the floating valve from being blocked due to uneven radial pressure in the moving process.
The inner hole of the screw plug consists of a conical section and a step-shaped equal-diameter section: the inner hole of the screw plug close to the oil outlet end is matched with the outer conical section of the supporting sleeve, and the surface of the 90-degree conical section of the matched screw plug is attached to the surface of the 90-degree outer conical section of the supporting sleeve. The middle section of the screw plug is an equal-diameter section, and an assembly space is reserved for the fan-shaped boss of the supporting sleeve. The inner hole of the front section of the screw plug is an oil inlet hole.
The sleeve is divided into a sleeve front section, a sleeve middle section and a sleeve rear section. The outer diameters of the front sleeve section and the rear sleeve section are the same and are 4mm smaller than the inner diameter of the shell, after the front sleeve section and the shell are assembled, an annular oil way front section is formed in a gap between the front sleeve section and the shell, and an annular oil way rear section is formed in a gap between the rear sleeve section and the shell. The inner surface of the middle section of the sleeve and the inner surface of the front section of the sleeve form a sealing surface with the end surface of the floating valve by the inner diameter difference of the two, and the sealing surface is a conical surface of 90 degrees. A plurality of sleeve rear section oil holes are uniformly distributed on the circumference of the sleeve rear section, a plurality of sleeve front section oil holes with the diameter of 2mm are uniformly distributed on the circumference of the sleeve front section, and each sleeve front section oil hole is communicated with the oil cavity of the flow dividing valve assembly.
The outer diameter of the rear section of the shunting valve is the same as the inner diameter of the sleeve, and the outer diameter and the inner diameter of the sleeve are in clearance fit; the outer diameter of the front section of the shunt valve is 5mm smaller than the inner diameter of the sleeve, and after assembly, a gap between the outer circumferential surface of the front section of the shunt valve and the inner circumferential surface of the sleeve forms a shunt valve assembly oil chamber. A plurality of radial oil through holes are uniformly distributed on the circumference of the front section shell of the shunting valve, so that an oil cavity of the shunting valve assembly is communicated with an inner hole of the front section of the shunting valve. The inner surface of the shunt valve is also provided with a stepped hole, wherein the aperture of an inner hole positioned at the rear section of the shunt valve is larger than the outer diameter of the reset spring; the inner hole diameter of the front section of the shunt valve is the same as the outer diameter of the valve, and the inner hole diameter and the outer diameter are in clearance fit; the middle section of the shunt valve is provided with a radially protruding annular boss, and the end face of the boss is a positioning surface of the valve. The inner diameter of the valve is matched with the spring, and an oil through hole is formed in the center of the valve end cover. The center of the limiting block is provided with an oil through hole with the inner diameter of 1.5 mm; the outer diameter of the stop block is the same as that of the spring; the outer circumferential surface of the front end of the stop block is provided with a positioning plate which protrudes radially, the outer diameter of the positioning plate is the same as the inner diameter of the front section of the shunt valve, and the inner surface of the front section of the shunt valve is provided with an annular mounting groove of a steel wire check ring for holes.
The outer diameter of the limiter is 2mm smaller than the inner diameter of the shell, and when the limiter and the shell are matched, a rear section of a partial annular oil path is formed between the outer circumferential surface of the limiter and the inner circumferential surface of the shell; the inner diameter of the limiter is the same as that of the oil outlet of the shell. A plurality of radial oil holes are uniformly distributed on the outer circumferential surface of the limiter, and the rear section of the annular oil way is communicated with an inner hole of the limiter. One end face of the limiter is provided with an annular boss which protrudes axially, and the outer surface of the boss is a positioning surface of the sleeve; the inner diameter of the annular boss is matched with the outer diameter of the return spring.
The supporting seat is positioned in the sleeve, and the end surface of the supporting seat close to the oil outlet end is attached to the end surface of the traveling valve close to the oil inlet end; the space between the end face of the oil outlet end of the supporting seat and the end face of the plug close to the oil inlet end forms a control chamber. The supporting sleeve is positioned in the shell; the boss of the bearing sleeve close to the oil outlet end is arranged in the groove of the end surface of the bearing seat, and the outer circumferential surface of the boss of the bearing sleeve is in interference fit with the inner circumferential surface of the groove of the bearing seat. A throttle plate is arranged between the boss end face of the bearing sleeve and the end face of the bearing sleeve, the central hole of the bearing sleeve, the throttle hole of the throttle plate and the central blind hole of the bearing sleeve are concentric to form a central oil path, and the central oil path is communicated with the oil inlet end of the shell through an oil collecting hole 25 in the bearing sleeve.
The outer diameter of the throttle plate is 0.3mm smaller than the inner diameter of the boss at the rear section of the support sleeve; the throttle plate has an inner diameter of 0.5 mm.
The central blind hole of the supporting sleeve is a main oil hole. One end face of the supporting sleeve is provided with a boss which protrudes axially, and the inner edge and the outer edge of the end face of the boss are inclined planes; the boss is fixed in the supporting seat, and the outer circumferential surface of the boss is in interference fit with the inner circumferential surface of the supporting seat; four axial oil holes parallel to the main oil holes are uniformly distributed on the end surface of the boss, four radial oil holes are uniformly distributed on the circumference of the boss, and each radial oil hole is communicated with each axial oil hole. Each radial oil hole is communicated with the main oil hole. The other end face of the supporting sleeve is in a conical shape with a high center and a low periphery, and the conical degree of the conical shape is 90 degrees; four axially convex fan-shaped bosses are uniformly distributed on the end face, the distance between two adjacent edges of each fan-shaped boss is 5mm, oil liquid splitter boxes are respectively formed by the distance, and the bottom surface of each oil liquid splitter box is also a 90-degree inclined plane with a high center and a low outer edge; the bottom surface of each oil liquid splitter groove is respectively provided with a radial oil collecting hole 25, and each oil collecting hole 25 is communicated with the main oil hole at the center of the supporting sleeve. The included angle between two bevel edges of each fan-shaped boss is 90 degrees. The end face of each fan-shaped boss is a stepped face, the arc surface of the small step and the end face of the large step are in transition through a 90-degree inclined face, and the inclined face is attached to the 90-degree inner end conical face of the plug screw during assembly.
The central hole of the supporting seat is a section of the central oil way. The end face of the bearing seat, which is attached to the end face of the floating valve, is a plane, the center of the end face of the other end is provided with a groove, the inner diameter of the groove is the same as the outer diameter of the boss at the rear section on the bearing sleeve, and the inner diameter of the groove and the outer diameter of the boss at the rear section on the bearing sleeve are in interference fit. The bottom in the groove is provided with a throttle plate positioning table which axially protrudes, and the outer circumferential surface of the throttle plate positioning table is a conical surface, so that the conical surface is matched with the inclined surface of the inner edge of the boss end surface of the supporting sleeve; and a gap of 0.3mm is formed between the two, and the oil can pass through the gap.
The invention can automatically cut off the oil way after the oil with the designed volume flows.
When the oil-hydraulic pressure limiting device works, oil is input from an oil inlet end and enters the interior of the valve through the screw plug, a part of the oil flows into the oil cavity of the shunt valve assembly from the front section of the annular oil way through the oil through holes in the sleeve, the shunt valve assembly overcomes the spring force of the return spring and moves to one end of the limiting device under the action of the oil-hydraulic pressure, and the oil flows to the rear section of the annular oil way from the oil cavity of the shunt valve assembly through the oil through holes in the sleeve and then flows to the oil outlet end of the shell through the oil through holes in the radial direction of the limiting device. Part of the oil liquid passes through the oil through hole on the bearing sleeve, then passes through the throttle hole on the throttle plate and the oil through hole on the bearing seat and enters the control cavity, and the floating valve component moves downwards under the action of pressure difference because the density of the whole floating valve component is designed to be close to that of the oil liquid and the friction force is small during movement. After the movement of the traveling valve finishes the total stroke, the 90-degree conical surface on the traveling valve is tightly pressed on the 90-degree conical surface of the sleeve under the pressure of oil to form conical surface sealing, the oil way between the front section and the rear section of the annular oil way is cut off, and the oil way at the oil inlet end and the oil outlet end of a product is disconnected.
The stop valve used in the hydraulic brake system of the airplane is arranged at the front end of an airplane wheel, when an airplane wheel cylinder seat is damaged and oil leaks, the oil way can be automatically cut off after the oil with the designed volume flows through the stop valve, the continuous leakage of the oil in a hydraulic pipeline is effectively avoided, and the safe landing of the airplane is ensured.
Drawings
Fig. 1 is a schematic structural view of the automatic shutoff valve capable of controlling the amount of oil leakage.
Fig. 2 is a schematic structural view of the plug screw.
FIG. 3 is a schematic view of the engagement of the bearing housing, throttle plate and bearing block.
FIG. 4 is a schematic structural view of the support sleeve; fig. 4a is a front view, fig. 4b is a right side view, fig. 4c is a left side view, and fig. 4d is a three-dimensional structure diagram.
FIG. 5 is a schematic view of a throttle plate configuration.
Fig. 6 is a schematic view of the structure of the floating gate.
Fig. 7 is a schematic view of the structure of the sleeve.
Fig. 8 is a schematic structural view of the shunt shutter.
Fig. 9 is a schematic view of the stopper.
Figure 10 is a schematic view of the structure of the backup pad.
Fig. 11 is a schematic view of the structure of the plug.
Fig. 12 is a schematic structural view of the stopper block.
In the figure: 1. a housing; 2. a limit stop; 3. a sleeve; 4. a shunt valve; 5. a shutter; 6. a steel wire retainer ring for the hole; 7. a movable valve; 8. blocking; 9. a plug screw; 10. a support sleeve; 11. a throttle plate; 12. a supporting seat; 13. a seal ring; 14. a snap ring; 15. a stopper block; 16. a spring; 17. a return spring; 18. a control chamber; 19. the annular oil circuit front section; 20. a diverter valve assembly oil chamber; 21. an oil hole at the front section of the sleeve; 22. an oil hole at the rear section of the sleeve; 23. a rear section of the annular oil way; 24. a central oil passage; 25. an oil collecting hole; 26. and (4) equalizing the pressure of the grooves.
Detailed Description
The embodiment is a stop valve for an aircraft hydraulic brake system, which can automatically cut off an oil path after oil with a designed volume flows.
The embodiment comprises a shell 1, a screw plug 9, a supporting sleeve 10, a throttle plate 11, a supporting seat 12, a floating valve assembly, a shunt valve assembly, a sleeve 3, a return spring 17 and a limiter 2. Wherein: the shunt valve assembly comprises a stop block 15, a hole steel wire retainer ring 6, a spring 16, a valve 5 and a shunt valve 4. The floating valve component comprises a floating valve 7, a plug 8, a stop ring 14 and a sealing ring 13. The limiter 2 is arranged in the shell 1 and is positioned at the oil outlet end of the shell 1, and the plug screw 9 is arranged in the shell 1 and is positioned at the oil inlet end of the shell 1; the central hole of the screw plug 9 is an oil inlet hole. The sleeve 3 is positioned in the shell 1 and is positioned between the limiter 2 and the screw plug; the outer surface of the middle part of the sleeve 3 is in sealing fit with the inner surface of the shell 1. The shunt valve assembly is positioned in the sleeve 3; one end of a return spring 17 is arranged in a return spring 17 mounting groove on the inner end surface of the arrester 2, and the other end of the return spring 17 is attached to the end surface of the oil outlet end of the shunt valve 4 in the shunt valve assembly. The valve 5 is arranged at the bottom of the oil inlet end of the shunt valve 4, and the valve 5 is in sliding fit with the sleeve 3; the limiting block 15 is arranged at the opening part of the oil inlet end of the shunt valve 4, and a positioning plate at the outer end of the limiting block 15 is fixedly matched with the shunt valve 4 through a hole by a steel wire retainer ring 6; a spring 16 is fitted over the block of the stopper 15, and one end of the spring 16 is fitted into the shutter 5.
The floating valve 7 in the floating valve component is positioned in the sleeve 3, and the end surface of the oil outlet end of the floating valve 7 is attached to the end surface of the oil inlet end of the shunt valve 4. The plug 8 is positioned in the moving valve 7 and is positioned at the position of the moving valve 7 close to the oil inlet end. Between the outer circumferential surface of the plug 8 and the inner circumferential surface of the floating gate 7, there are a stopper ring 14 and a sealing ring 13.
The moving valve 7 is in a round cylinder shape with one closed end. The outer diameter of the floating valve 7 is the same as the inner diameter of the sleeve 3, and the floating valve and the sleeve are in clearance fit. Three annular pressure equalizing grooves 26 are distributed on the outer circumferential surface of the floating valve 7. The outer edge of the outer end face of the closed end of the floating valve is a 90-degree conical surface and is used for being matched with the 90-degree conical surface in the middle section of the sleeve 3 to realize sealing matching between the two, so that the function of cutting off an oil way is achieved. The inner circumferential surface of the floating valve 7 close to the opening end is provided with a step, and the end surface of the step is a positioning surface of the plug 8; on one side of the step there is a mounting groove for the stop ring 14. The free-floating gate 7 can be moved axially in the sleeve 3. The annular pressure equalizing groove 26 on the outer circumferential surface prevents the floating gate 7 from being jammed due to radial uneven pressure during movement.
The plug 8 is in the shape of a circular block. The circumferential surface of the plug 8 is a stepped surface. On the circumferential surface of the plug 8 are distributed mounting grooves for a sealing ring 13 and a stop ring 14.
The plug screw 9 is a hollow revolving body. The inner hole of the screw plug 9 consists of a conical section and a step-shaped equal-diameter section. The inner hole of the screw plug 9 close to the oil outlet end is matched with the outer conical section of the supporting sleeve 10, and the surface of the 90-degree conical section of the screw plug 9 is attached to the surface of the 90-degree outer conical section of the supporting sleeve 10 after matching. The middle section of the screw plug 9 is an equal-diameter section, and an assembly space is reserved for a fan-shaped boss of the supporting sleeve 10. The inner hole of the front section of the screw plug 9 is an oil inlet hole. The front section of the outer circumferential surface of the screw plug 9 is a thread surface matched with the shell 1; a seal ring groove is arranged at the middle section of the outer circumferential surface of the screw plug 9.
The sleeve 3 is a cylindrical shell and is divided into a sleeve front section, a sleeve middle section and a sleeve rear section. The outer diameters of the front section of the sleeve 3 and the rear section of the sleeve 3 are the same and are both 4mm smaller than the inner diameter of the shell 1, after assembly, a gap between the front section of the sleeve 3 and the shell 1 forms an annular oil way front section 19, and a gap between the rear section of the sleeve 3 and the shell 1 forms an annular oil way rear section 23. Two radial protruding annular bosses are arranged on the outer circumferential surface of the middle section of the sleeve 3, and a seal ring groove is formed between the annular bosses; the outer diameter of the annular boss is the same as the inner diameter of the shell; the inner surface of the middle section of the sleeve 3 and the inner surface of the front section of the sleeve 3 form a sealing surface with the end surface of the floating valve 7 by the inner diameter difference of the two, and the sealing surface is a conical surface of 90 degrees. A plurality of sleeve back end oil holes 22 are evenly distributed on the circumference of the sleeve 3 back end, and in the embodiment, the number of the sleeve back end oil holes is 8. A plurality of sleeve front-section oil holes 21 with the diameter of 2mm are uniformly distributed on the circumference of the sleeve front section, and each sleeve front-section oil hole is communicated with a flow dividing valve assembly oil chamber 20; in this embodiment, the number of the oil holes at the front section of the sleeve is 12.
The shunt valve assembly comprises a stop block 15, a hole steel wire retainer ring 6, a spring 16, a valve 5 and a shunt valve 4. The shutter 5 and the stop block 15 are both located inside the shunt shutter 4, and a spring 16 is arranged between the shutter 5 and the stop block 15. And a steel wire retainer ring 6 for holes is arranged between the outer circumferential surface of the large outer diameter section of the stop block 15 and the shunt valve 4. The shunt valve 4 is a cylindrical shell, and the outer circumferential surface of the shunt valve is a stepped surface; the outer diameter of the rear section of the shunt valve 4 is the same as the inner diameter of the sleeve 3, and the outer diameter and the inner diameter are in clearance fit; the outer diameter of the front section of the shunt valve 4 is 5mm smaller than the inner diameter of the sleeve 3, and after assembly, a gap between the outer circumferential surface of the front section of the shunt valve 4 and the inner circumferential surface of the sleeve 3 forms a shunt valve assembly oil chamber 20. A plurality of radial oil through holes are uniformly distributed on the circumference of the shell at the front section of the flow dividing valve 4, so that the oil cavity 20 of the flow dividing valve assembly is communicated with the inner hole at the front section of the flow dividing valve. The inner surface of the shunt valve 4 is also a stepped hole, wherein the aperture of an inner hole at the rear section of the shunt valve 4 is larger than the outer diameter of the reset spring 17; the inner hole diameter of the front section of the shunt valve 4 is the same as the outer diameter of the valve 5, and the inner hole diameter and the outer diameter are in clearance fit; the middle section of the shunt valve 4 is provided with a radially protruding annular boss, and the end face of the boss is a positioning surface of the valve 5. The valve 5 is in a circular cylindrical shape; the inner diameter of the shutter 5 is adapted to the spring 16. An oil through hole is formed in the center of the end cover of the shutter 5. The stopper 15 is a hollow revolving body, and the center of the stopper is provided with an oil through hole with the inner diameter of 1.5 mm; the outer diameter of the stopper 15 is the same as the outer diameter of the spring 16; the outer circumferential surface of the front end of the stopper 15 is provided with a positioning plate which protrudes radially, the outer diameter of the positioning plate is the same as the inner diameter of the front section of the shunt valve 4, and the inner surface of the front section of the shunt valve 4 is provided with an annular mounting groove of the steel wire retainer ring 6 for holes.
The limiter 2 is a hollow revolving body. The outer diameter of the limiter 2 is 2mm smaller than the inner diameter of the shell 1, and when the two are matched, a partial annular oil path rear section 23 is formed between the outer circumferential surface of the limiter 2 and the inner circumferential surface of the shell 1; the inner diameter of the limiter 2 is the same as that of the oil outlet of the shell 1. 8 radial oil holes are uniformly distributed on the outer circumferential surface of the limiter 2, and the annular oil path rear section 23 is communicated with an inner hole of the limiter 2. One end surface of the arrester 2 is provided with an annular boss which axially protrudes, and the outer surface of the boss is a positioning surface of the sleeve 3; the inner diameter of the annular boss is adapted to the outer diameter of the return spring 17.
The supporting seat 12 is positioned in the sleeve 3, and the end surface of the supporting seat 12 close to the oil outlet end is attached to the end surface of the floating valve 7 close to the oil inlet end; the space between the end surface of the oil outlet end of the support seat 12 and the end surface of the plug 8 close to the oil inlet end forms a control chamber 18. The supporting sleeve 10 is positioned in the shell 1; the boss of the bearing sleeve 10 close to the oil outlet end is arranged in the groove of the end surface of the bearing seat 12, and the outer circumferential surface of the boss of the bearing sleeve 10 is in interference fit with the inner circumferential surface of the groove of the bearing seat 12. A throttle plate 11 is arranged between the boss end face of the bearing sleeve 10 and the end face of the bearing sleeve 12, the central hole of the bearing sleeve 12, the throttle hole of the throttle plate 11 and the central blind hole of the bearing sleeve 10 are concentric to form a central oil path 24, and the central oil path is connected with the oil inlet end of the shell 1 through an oil collecting hole 25 in the bearing sleeve 10.
The outer diameter of the throttle plate 11 is 0.3mm smaller than the inner diameter of the boss at the rear section of the support sleeve 10; the throttle plate has an inner diameter of 0.5 mm.
The supporting sleeve 10 is a truncated cone-shaped hollow structure, and a main oil hole is formed in a blind hole in a central hole of the supporting sleeve. One end face of the supporting sleeve 10 is provided with a boss which protrudes axially, and the inner edge and the outer edge of the end face of the boss are inclined planes; the boss is fixed in the support base 12, and the outer circumferential surface of the boss is in interference fit with the inner circumferential surface of the support base 12; four axial oil holes parallel to the main oil holes are uniformly distributed on the end surface of the boss, four radial oil holes are uniformly distributed on the circumference of the boss, and each radial oil hole is communicated with each axial oil hole. Each radial oil hole is communicated with the main oil hole. The other end face of the supporting sleeve 10 is in a conical shape with a high center and a low periphery, and the conical degree of the conical shape is 90 degrees; four axially convex fan-shaped bosses are uniformly distributed on the end face, the distance between two adjacent edges of each fan-shaped boss is 5mm, oil liquid splitter boxes are respectively formed by the distance, and the bottom surface of each oil liquid splitter box is also a 90-degree inclined plane with a high center and a low outer edge; the bottom surface of each oil splitter groove is provided with a radial oil collecting hole 25, and each oil collecting hole 25 is communicated with the main oil hole at the center of the supporting sleeve 10. The included angle between two bevel edges of each fan-shaped boss is 90 degrees. The end face of each fan-shaped boss is a stepped face, the arc surface of the small step and the end face of the large step are in transition through a 90-degree inclined face, and the inclined face is attached to the 90-degree inner end conical face of the screw plug 9 during assembly.
The support base 12 is a hollow rotary body. The central bore of the bearing block 12 is a segment of the central oil passage 24. The end face of the bearing seat 12, which is attached to the end face of the floating valve 7, is a plane, the center of the end face at the other end is provided with a groove, the inner diameter of the groove is the same as the outer diameter of the boss at the rear section of the bearing sleeve 10, and the inner diameter and the outer diameter are in interference fit. The bottom in the groove is provided with a throttle plate positioning table which axially protrudes, and the outer circumferential surface of the throttle plate positioning table is a conical surface, so that the conical surface is matched with the inclined surface of the inner edge of the boss end surface of the supporting sleeve 10; and a gap of 0.3mm is formed between the two, and the oil can pass through the gap. A packing installation groove is formed on the outer circumferential surface of the support base 12.
When the stop valve works, oil is input from the oil inlet end of the screw plug 9 and enters the stop valve through the equal-diameter section of the middle section of the screw plug 9 and the oil splitter box between the fan-shaped bosses of the supporting sleeve 10. Part of oil flows into a shunting valve assembly oil chamber 20 through an annular oil path front section 19 and a sleeve front section oil hole 21 on the sleeve 3, under the action of hydraulic pressure, the shunting valve assembly overcomes the spring force of a return spring 17 and moves to one end of the limiter 2, and at the moment, the oil can flow from the shunting valve assembly oil chamber 20 to an annular oil path rear section 23 through a sleeve rear section oil hole 22 on the sleeve 3 and then flows to an oil outlet end of the shell 1 through 8 oil through holes in the radial direction of the limiter 2. Part of the oil can also flow to the oil outlet end of the shell 1 through an oil hole with the diameter of 1.5mm in the stop block 15, an oil hole in the center of an end cover of the valve 5 and an axial oil hole of the stopper 2.
A part of the oil flows from the radial oil collecting hole 25 on the bearing sleeve 10 into the main oil hole of the bearing sleeve 10. A part of oil directly enters a central oil path 24 of the supporting seat 12 through the throttle hole of the throttle plate 11; part of the oil can also pass through the radial oil hole and the axial oil hole in the bearing sleeve 10 and the gap between the inner edge of the boss end face of the bearing sleeve 10 and the conical surface of the positioning table of the throttle plate of the bearing seat 12, and then enters the central oil path 24 of the bearing seat 12 through the throttle hole of the throttle plate 11. The oil in the central oil passage enters the control chamber 18. The density of the whole moving valve component is designed to be close to that of oil liquid, and the friction force is small during moving, so that the moving valve component is pushed to move leftwards under the action of pressure difference. After the moving left finishes the total stroke, the 90-degree conical surface on the moving valve 7 is tightly pressed on the 90-degree conical surface of the sleeve 3 under the pressure of the oil to form conical surface sealing, the oil path between the front section and the rear section of the annular oil path is cut off, namely the oil path between the oil inlet end and the oil outlet end of the product is cut off.
Since the ratio of the cross-sectional areas of the sleeve front-stage oil hole 21 in the sleeve 3 and the orifice of the orifice plate 11 is always constant, the ratio of the flow rates through the sleeve front-stage oil hole 21 in the sleeve 3 and the orifice of the orifice plate 11 is kept constant, that is, the ratio of the volumes of the oil passing through the sleeve front-stage oil hole 21 in the sleeve 3 and the orifice of the orifice plate 11 is kept constant in the same time. When the stop valve works, the floating valve component moves to the 90-degree conical surface of the sleeve 3, so that the volume of oil flowing through the throttling hole of the throttling plate 11 is always a constant value when an oil way is cut off, namely the product of the sectional area of the floating valve 7 and the total stroke of the floating valve, and therefore the volume of the oil flowing through the oil hole 21 in the front section of the sleeve on the sleeve 3 is also kept at the constant value in the time when the floating valve 7 finishes the total stroke, and therefore the volume of the oil flowing out of the oil outlet end of the stop valve is also the constant value, so that the oil way can be cut off after the oil flowing through the designed volume of the stop valve, and the oil is prevented from continuously leaking.
Claims (10)
1. An automatic stop valve capable of controlling oil leakage is characterized by comprising a shell (1), a screw plug (9), a supporting sleeve (10), a throttle plate (11), a supporting seat (12), a floating valve assembly, a shunt valve assembly, a sleeve (3), a return spring (17) and a limiter (2); wherein: the shunt valve assembly comprises a limiting block (15), a steel wire retainer ring (6) for a hole, a spring (16), a valve (5) and a shunt valve (4), the valve and the limiting block are both positioned in the shunt valve, and the spring is arranged between the valve and the limiting block; a steel wire check ring for holes is arranged between the outer circumferential surface of the large outer diameter section of the stop block and the shunt valve; the moving valve component comprises a moving valve (7) and a plug (8); the moving valve is positioned in the sleeve 3, so that the end surface of the oil outlet end of the moving valve is attached to the end surface of the oil inlet end of the flow dividing valve; the plug is positioned in the moving valve and is positioned at the position of the moving valve close to the oil inlet end; a stop ring (14) and a sealing ring (13) are arranged between the outer circumferential surface of the plug and the inner circumferential surface of the floating valve; the limiter (2) is arranged in the shell (1) and is positioned at the oil outlet end of the shell, and the plug screw is arranged in the shell and is positioned at the oil inlet end of the shell; the central hole of the screw plug is an oil inlet hole; the sleeve is positioned in the shell and is positioned between the limiter and the screw plug; the shunt valve assembly is positioned in the sleeve; one end of a return spring (17) is arranged in a return spring mounting groove on the inner end surface of the arrester, and the other end of the return spring is attached to the end surface of the oil outlet end of the shunt valve in the shunt valve assembly; the valve is arranged at the bottom of the oil inlet end of the shunt valve, and the valve is in sliding fit with the sleeve; the limiting block is arranged at the opening part of the oil inlet end of the shunt valve, and a positioning plate at the outer end of the limiting block is fixedly matched with the shunt valve through a steel wire check ring (6) through a hole; the block body of the stop block is sleeved with a spring, and one end of the spring is arranged in the valve.
2. The automatic stop valve capable of controlling the amount of oil leakage according to claim 1, wherein the floating shutter (7) has a cylindrical shape with one closed end; the outer diameter of the floating valve is the same as the inner diameter of the sleeve (3), and the outer diameter and the inner diameter are in clearance fit; three annular pressure equalizing grooves (26) are distributed on the outer circumferential surface of the floating valve; the outer edge of the outer end face of the closed end of the floating valve is a 90-degree conical surface and is used for being matched with the 90-degree conical surface in the middle section of the sleeve (3) so as to realize sealing matching between the two, and the function of cutting off an oil way is achieved; the inner circumferential surface of the floating valve close to the opening end is provided with a step, and the end surface of the step is a positioning surface for blocking; the floating valve can move axially in the sleeve; the annular pressure equalizing groove on the outer circumferential surface can prevent the floating valve from being blocked due to uneven radial pressure in the moving process.
3. The automatic stop valve capable of controlling the quantity of oil leakage according to claim 1, characterized in that the inner hole of the plug screw (9) is composed of a conical section and a step-shaped constant diameter section: an inner hole of the screw plug, which is close to the oil outlet end, is matched with the outer conical section of the supporting sleeve, and the surface of the 90-degree conical section of the matched screw plug is attached to the surface of the 90-degree outer conical section of the supporting sleeve; the middle section of the screw plug is an equal-diameter section, and an assembly space is reserved for a fan-shaped boss of the supporting sleeve; the inner hole of the front section of the screw plug is an oil inlet hole.
4. The automatic stop valve capable of controlling the amount of oil leakage according to claim 1, wherein the sleeve (3) is divided into a sleeve front section, a sleeve middle section and a sleeve rear section; the outer diameters of the front section and the rear section of the sleeve are the same and are both 4mm smaller than the inner diameter of the shell, after the sleeve is assembled, a gap between the front section of the sleeve and the shell forms an annular oil path front section (19), and a gap between the rear section of the sleeve and the shell 1 forms an annular oil path rear section (23); a sealing surface between the inner surface of the middle section of the sleeve and the inner surface of the front section of the sleeve is formed by the inner diameter difference of the inner surface and the inner surface, and the sealing surface is a 90-degree conical surface; a plurality of sleeve rear section oil holes (22) are uniformly distributed on the circumference of the sleeve rear section, a plurality of sleeve front section oil holes (21) with the diameter of 2mm are uniformly distributed on the circumference of the sleeve front section, and each sleeve front section oil hole is communicated with a flow dividing valve assembly oil chamber (20).
5. The automatic stop valve capable of controlling oil leakage according to claim 1, characterized in that the outer diameter of the rear section of the shunt valve (4) is the same as the inner diameter of the sleeve, and the outer diameter and the inner diameter are in clearance fit; the outer diameter of the front section of the shunt valve is 5mm smaller than the inner diameter of the sleeve, and after assembly, a gap between the outer circumferential surface of the front section of the shunt valve and the inner circumferential surface of the sleeve forms a shunt valve assembly oil cavity (20); a plurality of radial oil through holes are uniformly distributed on the circumference of the front section shell of the shunt valve, so that an oil cavity of the shunt valve assembly is communicated with an inner hole of the front section of the shunt valve; the inner surface of the shunt valve is also provided with a stepped hole, wherein the aperture of an inner hole positioned at the rear section of the shunt valve is larger than the outer diameter of the reset spring (17); the inner hole diameter of the front section of the shunt valve is the same as the outer diameter of the valve, and the inner hole diameter and the outer diameter are in clearance fit; the middle section of the shunt valve is provided with a radially protruding annular boss, and the end face of the boss is a positioning surface of the valve; the inner diameter of the valve is matched with the spring, and an oil through hole is formed in the center of the valve end cover; the center of the limiting block (15) is provided with an oil through hole with the inner diameter of 1.5 mm; the outer diameter of the stop block is the same as that of the spring; the outer circumferential surface of the front end of the stop block is provided with a positioning plate which protrudes radially, the outer diameter of the positioning plate is the same as the inner diameter of the front section of the shunt valve, and the inner surface of the front section of the shunt valve is provided with an annular mounting groove of a steel wire retainer ring (6) for holes.
6. The automatic shut-off valve capable of controlling the amount of oil leakage as claimed in claim 1, wherein the outside diameter of said stopper (2) is smaller than the inside diameter of said housing by 2mm, and when they are fitted, a partially annular oil passage rear section (23) is formed between the outer circumferential surface of the stopper and the inner circumferential surface of the housing; the inner diameter of the limiter is the same as that of the oil outlet of the shell; a plurality of radial oil holes are uniformly distributed on the outer circumferential surface of the limiter, and the rear section (23) of the annular oil way is communicated with an inner hole of the limiter; one end face of the limiter is provided with an annular boss which protrudes axially, and the outer surface of the boss is a positioning surface of the sleeve; the inner diameter of the annular boss is matched with the outer diameter of the return spring.
7. The automatic stop valve capable of controlling oil leakage according to claim 1, wherein the supporting seat (12) is positioned in the sleeve, and the end surface of the supporting seat close to the oil outlet end is jointed with the end surface of the floating valve close to the oil inlet end; a control chamber (18) is formed in a space between the end surface of the oil outlet end of the supporting seat and the end surface of the plug close to the oil inlet end; the supporting sleeve (10) is positioned in the shell; the boss of the bearing sleeve close to the oil outlet end is arranged in the groove of the end surface of the bearing seat, and the outer circumferential surface of the boss of the bearing sleeve is in interference fit with the inner circumferential surface of the groove of the bearing seat; a throttle plate is arranged between the boss end face of the bearing sleeve and the end face of the bearing sleeve, the central hole of the bearing sleeve, the throttle hole of the throttle plate (11) and the central blind hole of the bearing sleeve are concentric to form a central oil path (24), and the central oil path is connected with the oil inlet end of the shell through an oil collecting hole (25) in the bearing sleeve.
8. The automatic shut-off valve capable of controlling the amount of oil leakage as set forth in claim 1, wherein the outer diameter of the throttle plate (11) is smaller than the inner diameter of the boss of the rear stage of the bearing sleeve by 0.3 mm; the throttle plate has an inner diameter of 0.5 mm.
9. The automatic stop valve capable of controlling the amount of oil leakage according to claim 1, wherein the central blind hole of the support sleeve (10) is a main oil hole; one end face of the supporting sleeve is provided with a boss which protrudes axially, and the inner edge and the outer edge of the end face of the boss are inclined planes; the boss is fixed in the supporting seat, and the outer circumferential surface of the boss is in interference fit with the inner circumferential surface of the supporting seat; four axial oil holes parallel to the main oil holes are uniformly distributed on the end surface of the boss, four radial oil holes are uniformly distributed on the circumference of the boss, and each radial oil hole is communicated with each axial oil hole; each radial oil hole is communicated with the main oil hole; the other end face of the supporting sleeve is in a conical shape with a high center and a low periphery, and the conical degree of the conical shape is 90 degrees; four axially convex fan-shaped bosses are uniformly distributed on the end face, the distance between two adjacent edges of each fan-shaped boss is 5mm, oil liquid splitter boxes are respectively formed by the distance, and the bottom surface of each oil liquid splitter box is also a 90-degree inclined plane with a high center and a low outer edge; the bottom surface of each oil liquid splitter box is respectively provided with a radial oil collecting hole 25, and each oil collecting hole 25 is communicated with the main oil hole at the center of the supporting sleeve; the included angle between the two bevel edges of each fan-shaped boss is 90 degrees; the end face of each fan-shaped boss is a stepped face, the arc surface of the small step and the end face of the large step are in transition through a 90-degree inclined face, and the inclined face is attached to the 90-degree inner end conical face of the screw plug 9 during assembly.
10. Automatic shut-off valve capable of controlling the amount of oil leakage according to claim 1, characterised in that the central hole of the support (12) is a section of the central oil circuit (24); the end face of the bearing seat, which is attached to the end face of the floating valve (7), is a plane, the center of the end face at the other end is provided with a groove, the inner diameter of the groove is the same as the outer diameter of a boss at the rear section of the bearing sleeve (10), and the inner diameter and the outer diameter are in interference fit; the bottom in the groove is provided with a throttle plate positioning table which axially protrudes, and the outer circumferential surface of the throttle plate positioning table is a conical surface, so that the conical surface is matched with the inclined surface of the inner edge of the boss end surface of the supporting sleeve; and an oil passage of 0.3mm is arranged between the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110850098.XA CN113581146B (en) | 2021-07-27 | 2021-07-27 | Automatic stop valve capable of controlling oil leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110850098.XA CN113581146B (en) | 2021-07-27 | 2021-07-27 | Automatic stop valve capable of controlling oil leakage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113581146A true CN113581146A (en) | 2021-11-02 |
| CN113581146B CN113581146B (en) | 2022-08-23 |
Family
ID=78250632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110850098.XA Active CN113581146B (en) | 2021-07-27 | 2021-07-27 | Automatic stop valve capable of controlling oil leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113581146B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3159084A (en) * | 1963-07-25 | 1964-12-01 | Gen Motors Corp | Hydraulic steering system |
| CN201531646U (en) * | 2009-09-18 | 2010-07-21 | 北京航天发射技术研究所 | System integrated oil circuit breaker |
| CN102818058A (en) * | 2012-07-20 | 2012-12-12 | 成都安迪生测量有限公司 | Large flow pipe-type breaking valve |
| CN205781172U (en) * | 2016-05-25 | 2016-12-07 | 嘉能（天津）机械科技有限公司 | A kind of repair type Pull breaking ualve for liquid feeding pipeline |
| CN109050946A (en) * | 2018-09-05 | 2018-12-21 | 朱文祥 | A kind of automatic cut out formula the service of connection devices for air refuelling |
| CN209325116U (en) * | 2018-08-14 | 2019-08-30 | 北京艾迪西暖通科技有限公司 | Safety protective valve and pipe safety protective device |
| CN210212356U (en) * | 2019-04-19 | 2020-03-31 | 西安航空制动科技有限公司 | Exhaust device for exhausting gas in aircraft brake system |
| CN111976960A (en) * | 2020-07-08 | 2020-11-24 | 西安航空制动科技有限公司 | Automatic flow regulator of airplane brake system |
| CN212479749U (en) * | 2020-06-01 | 2021-02-05 | 北京博键传动技术有限公司 | High-temperature-resistant high-pressure-resistant bidirectional hydraulic control ultrahigh-pressure mixed fluid stop valve |
-
2021
- 2021-07-27 CN CN202110850098.XA patent/CN113581146B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3159084A (en) * | 1963-07-25 | 1964-12-01 | Gen Motors Corp | Hydraulic steering system |
| CN201531646U (en) * | 2009-09-18 | 2010-07-21 | 北京航天发射技术研究所 | System integrated oil circuit breaker |
| CN102818058A (en) * | 2012-07-20 | 2012-12-12 | 成都安迪生测量有限公司 | Large flow pipe-type breaking valve |
| CN205781172U (en) * | 2016-05-25 | 2016-12-07 | 嘉能（天津）机械科技有限公司 | A kind of repair type Pull breaking ualve for liquid feeding pipeline |
| CN209325116U (en) * | 2018-08-14 | 2019-08-30 | 北京艾迪西暖通科技有限公司 | Safety protective valve and pipe safety protective device |
| CN109050946A (en) * | 2018-09-05 | 2018-12-21 | 朱文祥 | A kind of automatic cut out formula the service of connection devices for air refuelling |
| CN210212356U (en) * | 2019-04-19 | 2020-03-31 | 西安航空制动科技有限公司 | Exhaust device for exhausting gas in aircraft brake system |
| CN212479749U (en) * | 2020-06-01 | 2021-02-05 | 北京博键传动技术有限公司 | High-temperature-resistant high-pressure-resistant bidirectional hydraulic control ultrahigh-pressure mixed fluid stop valve |
| CN111976960A (en) * | 2020-07-08 | 2020-11-24 | 西安航空制动科技有限公司 | Automatic flow regulator of airplane brake system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113581146B (en) | 2022-08-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4878651A (en) | Valve seat assembly | |
| US4167262A (en) | Pilot actuated valve | |
| US3905382A (en) | Back flow preventor | |
| US3749357A (en) | Valve structure having fluid pressure actuated seats | |
| US5494256A (en) | Dual seal ball valve | |
| US4084608A (en) | Cocks having rotating valves and sliding seats | |
| US3996965A (en) | Pilot valve mechanism for high or low pressure cutoff control | |
| US3565392A (en) | Flow-blocking device with retractable sealing means | |
| US2469921A (en) | Valve | |
| US4883083A (en) | Relief valve assembly; piston member from same and filter head assembly incorporating same | |
| US2650793A (en) | Valve | |
| US2372016A (en) | Unloader valve | |
| US3599991A (en) | Auxiliary valve stem seal | |
| CN113581146B (en) | Automatic stop valve capable of controlling oil leakage | |
| US3828812A (en) | Pressure-monitoring relief valve | |
| US3774504A (en) | Sliding spool valve | |
| AU705752B2 (en) | Filter assemblies comprising differential pressure indicators | |
| US3476133A (en) | Valve operated by rate of fluid pressure change | |
| US3421544A (en) | Fluid control device | |
| US3351316A (en) | Pilot operated piston valve | |
| US2660397A (en) | Quick sealing automatic sealing gate valve | |
| US3608576A (en) | Pilot-controlled pressure relief valve | |
| US4235267A (en) | Valved couplings | |
| US3918486A (en) | Device for transmitting a pressure fluid from a stationary source to a rotating shaft | |
| US3479004A (en) | Valve construction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |