CN108895168B - Lower end sealing structure of pressure maintaining cylinder - Google Patents
Lower end sealing structure of pressure maintaining cylinder Download PDFInfo
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- CN108895168B CN108895168B CN201810917959.XA CN201810917959A CN108895168B CN 108895168 B CN108895168 B CN 108895168B CN 201810917959 A CN201810917959 A CN 201810917959A CN 108895168 B CN108895168 B CN 108895168B
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- sealing
- valve
- valve clack
- valve seat
- groove
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Check Valves (AREA)
Abstract
The invention relates to a sealing structure at the lower end of a pressure maintaining cylinder, which comprises a rock core cylinder, a drilling machine outer cylinder and a latch type flap valve, wherein the flap valve comprises a valve seat and a latch type valve clack; the elastic connecting strips connect all the locking strips in series and the elastic sealing rings are used for hooping all the locking strips together to form an integral structure, and sealing elements are arranged between two adjacent locking strips. When the core barrel is positioned in the valve seat, the valve clack is opened for 90 degrees and positioned between the core barrel and the outer barrel of the drilling machine, so that the space is saved, and the limitation on the diameter of the drilled core can be eliminated; when the core barrel is lifted to a certain height, the valve clack automatically returns to the top surface of the valve seat to be in sealing contact with the sealing surface of the valve port. The valve clack deformation capability is strong, the sealing matching position can be automatically adjusted, the matching success rate is high, the sealing performance is reliable, and the valve clack has reverse self-locking characteristic when pressure is maintained and stressed.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a sealing structure at the lower end of a pressure maintaining cylinder.
Background
At present, in the field of pressure-keeping coring, the upper end of a pressure-keeping cylinder is generally sealed by a piston, and the lower end of the pressure-keeping cylinder is generally sealed by a ball valve or a flap valve. The ball valve has a complex structure and large space occupation, the diameter of a drilled core is limited, the ball valve processing technology has high requirements, and when the pressure is high, liquid in the pressure maintaining cylinder can seep out from a gap between the ball valve and the core cylinder and cannot maintain high pressure; the existing flap valve has the defects that the structure is simple, the high pressure can be maintained, the valve clack is in a fixed shape, cannot deform and the matching success rate is low.
Disclosure of Invention
The invention aims to provide a lower end sealing structure of a pressure maintaining cylinder, wherein the lower end sealing is realized by adopting a flap valve, the valve clack of the flap valve has deformability, the matching success rate is high, and the sealing performance is reliable.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the lower end sealing structure of the pressure maintaining cylinder comprises a core cylinder, a drilling machine outer cylinder and a lock nail type flap valve, wherein the lock nail type flap valve comprises a valve seat and a lock nail type valve clack, the valve seat is coaxially arranged on the inner wall of the drilling machine outer cylinder, one end of the valve clack is movably connected with the outer side wall of the upper end of the valve seat, and the top of the valve seat is provided with a valve port sealing surface matched with the valve clack;
the valve clack comprises an elastic sealing ring, an elastic connecting strip, a sealing piece and a plurality of locking strips which are sequentially arranged in parallel; the elastic connecting strips connect all the locking strips in series and the elastic sealing rings are used for hooping all the locking strips together to form an integral structure, clamping grooves matched with the elastic sealing rings are formed in the locking strips, the elastic sealing rings are arranged in the clamping grooves, and sealing elements are arranged between two adjacent locking strips;
when the core barrel is positioned in the valve seat, the valve clack is opened for 90 degrees and positioned between the core barrel and the outer barrel of the drilling machine; when the core barrel is lifted to a certain height, the valve clack returns to the top surface of the valve seat to be in sealing contact with the sealing surface of the valve port, and two adjacent locking strips are in sealing contact.
Wherein, when the valve clack is opened by 90 degrees, the locking bar is parallel to the axis of the valve seat.
Further, when the valve clack is in sealing contact with the valve seat, the valve clack is of a circular flat plate structure.
Wherein, except for the head and the tail locking strips, one surface of the other locking strips is provided with a wedge-shaped through groove, and the other opposite surface is provided with a convex part matched with the wedge-shaped through groove;
one of the two locking strips at the head and the tail is provided with a wedge-shaped through groove, and the other locking strip is provided with a convex part;
the convex part of one locking strip of the two adjacent locking strips is in wedge fit with the wedge-shaped through slot of the other locking strip, and the sealing piece is arranged between the slot wall of the wedge-shaped through slot and the convex part.
Further, when the valve clack is in sealing contact with the valve port sealing surface, the elastic sealing ring is positioned in the middle of the valve clack, the sealing element is positioned above the elastic sealing ring, and the elastic connecting strip is positioned above the sealing element.
Further, one groove wall of the wedge-shaped through groove is provided with a first limiting step surface, and the convex part of the corresponding other locking strip is provided with a second limiting step surface which is matched with the first limiting step surface;
when the valve clack is in sealing contact with the valve seat, the first limiting step surface is abutted against the second limiting step surface, the first limiting step surface is positioned on the outer side of the second limiting step surface, and the first limiting step surface and the second limiting step surface are positioned below the elastic sealing ring.
Further, the wedge-shaped through groove is V-shaped, U-shaped or trapezoidal.
Wherein the sealing element is arranged on the wall of the wedge-shaped through groove.
Further, the seal includes a bead for providing a soft seal and a metal seal for providing a hard seal.
Preferably, the seal further comprises graphite, the sealing strip being located between the graphite and the metal seal, the graphite being located inside the sealing strip.
Further, the valve clack is movably connected to the valve seat through a spring piece, the spring piece comprises a rotating shaft and an elastic spring piece, the outer side wall of the top end of the valve seat is provided with a rotating shaft accommodating groove matched with the rotating shaft, the rotating shaft is arranged in the rotating shaft accommodating groove, the outer surface of the valve clack is provided with a spring piece accommodating groove for accommodating the spring piece, and the spring piece is arranged in the spring piece accommodating groove.
Further, a sealing ring is arranged between the outer wall of the valve seat and the inner wall of the outer cylinder of the drilling machine.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the lock nail type flap valve to realize the lower end sealing, when the valve is opened, the lock nail type valve clack deforms and is hidden between the core barrel and the outer barrel of the drilling machine, thereby saving space and eliminating the limit on the diameter of the core to be drilled; when the core barrel is lifted to a certain height, the valve clack of the lock nail type is automatically closed, the deformation capacity of the valve clack is strong, the sealing matching position can be automatically adjusted, the matching success rate is high, the sealing performance is reliable, and the valve clack has reverse self-locking characteristic when pressure maintaining is stressed.
Drawings
FIG. 1 is a schematic view of the structure of the present invention with the valve flap open;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a three-dimensional perspective view of the latch nail flap valve with the core barrel in the valve seat;
FIG. 4 is a top view of the valve flap of FIG. 3;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 6 is an enlarged view of a portion of FIG. 5 at A;
FIG. 7 is a three-dimensional perspective view of the valve flap in its natural state;
FIG. 8 is a partial schematic view of the present invention with the valve flap closed;
FIG. 9 is a three-dimensional perspective view of the latch-type flap valve with the valve flap closed;
FIG. 10 is a three-dimensional perspective view of a valve flap when pressurized;
FIG. 11 is a front view of the valve flap when pressurized;
in the figure: 1-valve seat, 2-valve clack, 3-spring leaf, 5-core barrel, 6-drilling machine outer barrel, 7-sealing ring, 8-drill bit, 9-core catcher, 10-piston, 11-valve port sealing surface, 12-annular groove, 21-locking strip, 22-elastic connecting strip, 23-sealing piece, 24-elastic sealing ring, 25-spring leaf accommodating groove, 31-rotating shaft, 32-spring leaf, 211-wedge through groove, 212-convex part, 213-limit step surface I, 214-limit step surface II, 231-sealing strip, 232-metal sealing piece, 233-graphite and 234-auxiliary sealing piece.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1-11, the lower end sealing structure of the pressure maintaining cylinder disclosed by the invention comprises a core cylinder 5, a drilling machine outer cylinder 6 and a lock sub-A type flap valve, wherein the lock sub-A type flap valve comprises a valve seat 1 and a lock sub-A type valve clack 2, the valve seat 1 is coaxially arranged on the inner wall of the drilling machine outer cylinder 6, one end of the valve clack 2 is movably connected with the outer side wall of the upper end of the valve seat 1, the top of the valve seat 1 is provided with a valve port sealing surface 11 matched with the valve clack 2, and the valve port sealing surface 11 is a conical surface.
The valve clack 2 comprises an elastic sealing ring 24, an elastic connecting strip 22, a sealing piece 23 and a plurality of locking strips 21 which are sequentially arranged in parallel. The number of the locking strips 21 is at least 3, and the number of the locking strips 21 is determined according to the size of the valve port sealing surface. The elastic connecting strips 22 connect all the locking strips 21 in series and the elastic sealing rings 24 hoop all the locking strips 21 together to form a whole structure, the locking strips 21 are provided with clamping grooves matched with the elastic sealing rings 24, the elastic sealing rings 24 are arranged in the clamping grooves, and sealing elements 23 are arranged between two adjacent locking strips 21. Since the plurality of lock bars 21 arranged in parallel are connected in series by the elastic connecting bar 22, they are tightened by the elastic seal ring 24. When the valve clack 2 or the locking strip 21 is subjected to external force, the locking strip 21 and the elastic sealing ring 24 can be elastically deformed, and then the two adjacent locking strips 21 can relatively displace and rotate, so that the valve clack 2 can be deformed when being subjected to external force.
As shown in fig. 1, 2 and 3, when the core barrel 5 is located in the valve seat 1, the valve clack 2 is opened by 90 degrees due to the acting force of the core barrel 5, two adjacent locking strips 21 are opened due to the acting force of the two sides of the core barrel 5 and the outer barrel 6 of the drilling machine, the valve clack 2 is deformed and finally hidden between the core barrel 5 and the outer barrel 6 of the drilling machine, the inner surface of the valve clack 2 is completely attached to the outer side wall of the core barrel 5, the space is saved, and the limitation on the diameter of a drilled core can be eliminated. As shown in fig. 3 and 4, the locking bar 21 is now parallel to the axis of the valve seat 1.
As shown in fig. 8 and 9, when the core barrel 5 is lifted up to a certain height, the valve clack 2 returns to the top surface of the valve seat 1 to be in sealing contact with the valve port sealing surface 11, and two adjacent locking strips 21 are in sealing contact, so that the medium is blocked. The outer wall of the valve seat 1 is provided with an annular groove 12 for installing a sealing ring, and the sealing ring 7 is arranged in the annular groove 12 to realize sealing fit between the valve seat 1 and the outer cylinder 6 of the drilling machine.
As shown in fig. 4, 5 and 6, except for the first and the last locking strips 21, one surface of the other locking strip 21 is provided with a wedge-shaped through groove 211, and the opposite surface is provided with a convex part 212 which is matched with the wedge-shaped through groove 211. One of the two lock bars 21 at the head and the tail is provided with a wedge-shaped through groove 211, and the other lock bar 21 is provided with a convex part 212; the convex portion 212 of one of the adjacent two lock bars 21 is caught in the wedge-shaped through groove 211 of the other lock bar 21.
The wedge-shaped through groove 211 is V-shaped, trapezoidal, or the like, and the seal 23 is mounted on the groove wall of the wedge-shaped through groove 211. The seal 23 comprises a sealing strip 231 for providing a soft seal, a metal seal 232 for providing a hard seal and two auxiliary seals 234. The sealing strip 231 is installed between two auxiliary sealing members 234, and the auxiliary sealing members 234 position-fix the sealing strip 231 while protecting the sealing strip 231.
The seal 23 further includes graphite 233, the seal bar 231 is located between the graphite 233 and the metal seal 232, the graphite 233 is located inside the seal bar 231, and the graphite material can reduce sliding resistance between the locking bars 21. Because the slot walls of the wedge-shaped through slots 211 have a certain inclination, as shown in fig. 8, 9 and 10, when the wedge-shaped through slots are closed, the rear locking strip 21 firstly contacts with the graphite 233 part of the front locking strip 21, so that the graphite reduces friction and is beneficial to closing movement; then, the sealing function is performed firstly by the sealing strip 231, the softer sealing strip 231 firstly meets the initial sealing condition, the sealing strip 231 is long and has a circular cross section, and the length of the sealing strip is consistent with the contact length of two adjacent locking strips 21. As the pressure increases, the outer metal seal 232 also seals.
When the valve clack 2 is in sealing contact with the valve port sealing surface 11, the elastic sealing ring 24 is positioned in the middle of the valve clack 2, the sealing piece 23 is positioned above the elastic sealing ring 24, and the elastic connecting strip 22 is positioned above the sealing piece 23. The valve clack 2 has a tendency to become a flat plate structure in a natural state due to the pressure of the elastic connection bar 22 and the elastic sealing ring 24, but the valve clack 2 has a micro arc plate structure in a natural state due to the blocking effect of the sealing member 23, as shown in fig. 7. However, when the valve clack 2 is pressed into sealing contact with the valve seat 1, as shown in fig. 8-11, two adjacent locking strips 21 press the sealing piece 23 to realize sealing contact, and the valve clack 2 is deformed into a circular flat plate structure.
As shown in fig. 5 and 6, the sealing member 23 is mounted on one groove wall of the wedge-shaped through groove 211, the other groove wall of the wedge-shaped through groove 211 is provided with a first limiting step surface 213, and the convex portion 212 of the corresponding other locking strip 21 is provided with a second limiting step surface 214 matched with the first limiting step surface 213. When the valve clack 2 is in sealing contact with the valve seat 1, the first limiting step surface 213 and the second limiting step surface 214 are positioned below the elastic sealing ring 24, the first limiting step surface 213 is in contact with the second limiting step surface 214, and the first limiting step surface 213 is positioned outside the second limiting step surface 214, so that the convex part 212 is prevented from withdrawing from the wedge-shaped through groove 211 when the valve clack 2 is pressed, and the valve clack can reversely self-lock when the valve clack is under pressure.
As shown in fig. 3 and 9, the valve clack 2 is movably connected to the valve seat 1 through a spring piece 3, the spring piece 3 includes a rotating shaft 31 and an elastic spring piece 32, the outer side wall of the top end of the valve seat 1 is provided with a rotating shaft accommodating groove adapted to the rotating shaft 31, the rotating shaft 31 is arranged in the rotating shaft accommodating groove, the outer surface of the valve clack 2 is provided with a spring piece accommodating groove 25 for accommodating the spring piece 32, and the spring piece 32 is arranged in the spring piece accommodating groove 25. The elastic sheet 32 is a curved steel sheet, the curved steel sheet is clamped at the elastic sheet accommodating groove 25, the curved steel sheet can be straightened under the action of external force, and the curved surface of the curved steel sheet can be changed into a plane and is completely attached to the elastic sheet accommodating groove 25 on the outer surface of the valve clack 2.
In another embodiment, the valve clack 2 is hinged with the outer side wall of the upper end of the valve seat 1 through a pin shaft and a torsion spring.
As shown in fig. 1, the inner wall of the lower end of the core barrel 5 is provided with a core catcher 9, the upper part of the core barrel 5 is provided with a piston 10, the lower end of the outer barrel 6 of the drilling machine is connected with a drill bit 8, as shown in fig. 1, in the core drilling stage, the lower end of the core barrel 5 passes through the valve seat 1 and extends to the bottom of the outer barrel 6 of the drilling machine, and the valve clack 2 is opened for 90 degrees due to the acting force of the core barrel 5, so that in-situ water environment can invade the core barrel 5; as the drill bit 8 drills, the core enters the core barrel 5 from the lower end of the core barrel 5 and is gripped by the core catcher 9.
After the drilling is finished, the core barrel 5 is lifted upwards, and the core catcher 9 and the core rise together with the core barrel 5. As shown in fig. 8, when the core barrel 5 is lifted up to a certain height and the bottom of the core barrel passes over the valve clack 2, the elastic force is released by the elastic sheet 32 clamped between the outer barrel 6 of the drilling machine and the valve clack 2, the valve clack 2 is reversed under the action of the elastic force of the elastic sheet 32 and self gravity to realize sealing fit with the valve seat 1, and the valve is closed, so that the lower end of the core barrel 5 is sealed, and the liquid in the core barrel 5 is prevented from losing; the valve flap 2 comes into contact with the valve seat 1 more and more tightly under the internal liquid pressure, and the sealing effect is better as the internal pressure is larger.
The invention adopts the lock nail type flap valve to realize the lower end sealing, when the valve is opened, the lock nail type valve clack deforms and is hidden between the core barrel and the outer barrel of the drilling machine, thereby saving space and eliminating the limit on the diameter of the core to be drilled; when the core barrel is lifted to a certain height, the valve clack of the lock nail type is automatically closed, the deformation capacity of the valve clack is strong, the sealing matching position can be automatically adjusted, the matching success rate is high, the sealing performance is reliable, and the valve clack has reverse self-locking characteristic when pressure maintaining is stressed.
There are, of course, many other embodiments of the invention that can be made by those skilled in the art in light of the above teachings without departing from the spirit or essential scope thereof, but that such modifications and variations are to be considered within the scope of the appended claims.
Claims (8)
1. The sealing structure for the lower end of the pressure maintaining cylinder is characterized by comprising a core cylinder (5), a drilling machine outer cylinder (6) and a lock nail type flap valve, wherein the lock nail type flap valve comprises a valve seat (1) and a lock nail type valve clack (2), the valve seat (1) is coaxially arranged on the inner wall of the drilling machine outer cylinder (6), one end of the valve clack (2) is movably connected with the outer side wall of the upper end of the valve seat (1), and a valve port sealing surface (11) matched with the valve clack (2) is arranged at the top of the valve seat (1);
the valve clack (2) comprises an elastic sealing ring (24), an elastic connecting strip (22), a sealing piece (23) and a plurality of locking strips (21) which are sequentially arranged in parallel; the elastic connecting strips (22) connect all the locking strips (21) in series and the elastic sealing rings (24) hoop all the locking strips (21) together to form an integral structure, the locking strips (21) are provided with clamping grooves matched with the elastic sealing rings (24), the elastic sealing rings (24) are arranged in the clamping grooves, and sealing elements (23) are arranged between two adjacent locking strips (21);
when the core barrel (5) is positioned in the valve seat (1), the valve clack (2) is opened by 90 degrees and is positioned between the core barrel (5) and the outer barrel (6) of the drilling machine; when the core barrel (5) is lifted to a certain height, the valve clack (2) returns to the top surface of the valve seat (1) to be in sealing contact with the valve port sealing surface (11), and two adjacent locking strips (21) are in sealing contact;
when the valve clack (2) is opened by 90 degrees, the locking strip (21) is parallel to the axis of the valve seat (1);
one surface of the other locking strips (21) except the head and tail locking strips (21) is provided with a wedge-shaped through groove (211), and the other opposite surface is provided with a convex part (212) which is matched with the wedge-shaped through groove (211);
one (21) of the two lock bars (21) at the head and the tail is provided with a wedge-shaped through groove (211), and the other lock bar (21) is provided with a convex part (212);
the convex part (212) of one locking strip (21) of the two adjacent locking strips (21) is in wedge fit with the wedge-shaped through groove (211) of the other locking strip (21), and the sealing piece (23) is arranged between the groove wall of the wedge-shaped through groove (211) and the convex part (212).
2. The pressure maintaining cylinder lower end sealing structure according to claim 1, wherein: when the valve clack (2) is in sealing contact with the valve seat (1), the valve clack (2) is of a circular flat plate structure.
3. The pressure maintaining cylinder lower end sealing structure according to claim 1, wherein: when the valve clack (2) is in sealing contact with the valve port sealing surface (11), the elastic sealing ring (24) is positioned in the middle of the valve clack (2), the sealing piece (23) is positioned above the elastic sealing ring (24), and the elastic connecting strip (22) is positioned above the sealing piece (23).
4. The pressure maintaining cylinder lower end sealing structure according to claim 3, wherein: one groove wall of the wedge-shaped through groove (211) is provided with a first limiting step surface (213), and a convex part (212) of the corresponding other locking bar (21) is provided with a second limiting step surface (214) which is matched with the first limiting step surface (213);
when the valve clack (2) is in sealing contact with the valve seat (1), the first limiting step surface (213) and the second limiting step surface (214) are positioned below the elastic sealing ring (24), the first limiting step surface (213) is in abutting contact with the second limiting step surface (214), and the first limiting step surface (213) is positioned outside the second limiting step surface (214).
5. The pressure maintaining cylinder lower end sealing structure according to claim 1, 3 or 4, characterized in that: the sealing element (23) is mounted on the groove wall of the wedge-shaped through groove (211).
6. The pressure maintaining cylinder lower end sealing structure according to claim 1, 3 or 4, characterized in that: the seal (23) comprises a sealing strip (231) for providing a soft seal and a metal seal (232) for providing a hard seal.
7. The pressure maintaining cylinder lower end sealing structure according to claim 1, wherein: the valve clack (2) is movably connected to the valve seat (1) through the spring piece (3), the spring piece (3) comprises a rotating shaft (31) and an elastic spring piece (32), the outer side wall of the top end of the valve seat (1) is provided with a rotating shaft accommodating groove matched with the rotating shaft (31), the rotating shaft (31) is arranged in the rotating shaft accommodating groove, the outer surface of the valve clack (2) is provided with a spring piece accommodating groove (25) for accommodating the spring piece (32), and the spring piece (32) is arranged in the spring piece accommodating groove (25).
8. The pressure maintaining cylinder lower end sealing structure according to claim 1, wherein: a sealing ring (7) is arranged between the outer wall of the valve seat (1) and the inner wall of the outer cylinder (6) of the drilling machine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810917959.XA CN108895168B (en) | 2018-08-13 | 2018-08-13 | Lower end sealing structure of pressure maintaining cylinder |
| PCT/CN2018/108976 WO2020034355A1 (en) | 2018-08-13 | 2018-09-30 | Pressure-maintaining-cylinder lower-end sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810917959.XA CN108895168B (en) | 2018-08-13 | 2018-08-13 | Lower end sealing structure of pressure maintaining cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108895168A CN108895168A (en) | 2018-11-27 |
| CN108895168B true CN108895168B (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810917959.XA Active CN108895168B (en) | 2018-08-13 | 2018-08-13 | Lower end sealing structure of pressure maintaining cylinder |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108895168B (en) |
| WO (1) | WO2020034355A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847856B (en) * | 2019-11-26 | 2024-04-12 | 四川大学 | Flap valve structure of pressure maintaining corer |
| CN110761785B (en) * | 2019-11-26 | 2024-01-23 | 四川大学 | Pressure maintaining cabin structure with glass window |
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| CN108895168A (en) | 2018-11-27 |
| WO2020034355A1 (en) | 2020-02-20 |
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