CN109578611B - Ball valve - Google Patents

Ball valve Download PDF

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Publication number
CN109578611B
CN109578611B CN201811580758.1A CN201811580758A CN109578611B CN 109578611 B CN109578611 B CN 109578611B CN 201811580758 A CN201811580758 A CN 201811580758A CN 109578611 B CN109578611 B CN 109578611B
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China
Prior art keywords
valve
valve rod
ball
hole
positioning
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CN201811580758.1A
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Chinese (zh)
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CN109578611A (en
Inventor
宣琦
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Paili Valve Group Co., Ltd
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Paili Valve Technology Co Ltd
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Priority to CN201811580758.1A priority Critical patent/CN109578611B/en
Publication of CN109578611A publication Critical patent/CN109578611A/en
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Publication of CN109578611B publication Critical patent/CN109578611B/en
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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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/061—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor knee-joint
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663—Packings
    • F16K5/0689—Packings between housing and plug

Abstract

The invention discloses a ball valve, which relates to the technical field of ball valves for natural gas and at least comprises a valve seat, a valve ball arranged in the valve seat and two connecting pipes arranged at two sides of the valve seat, wherein two sides of the valve ball are respectively clamped and positioned through a positioning seat, first sealing rings attached to the outer wall of the valve ball are respectively arranged at one sides of the two positioning seats facing the valve ball, a valve rod through hole is formed in the upper side of the valve seat in a penetrating mode through the inner wall and the outer wall, and a valve rod and a double-joint universal joint are further arranged on the valve seat. The invention provides a ball valve, which aims to solve the problem that a sealing structure between a valve rod and a valve rod positioning hole is easy to damage in the existing ball valve so as to cause ball valve leakage, and the sealing structure between the valve rod and the valve rod positioning hole is not easy to damage so as to reduce the leakage possibility.

Description

Ball valve
Technical Field
The invention relates to the technical field of ball valves, in particular to a ball valve for natural gas.
Background
Compared with a ball valve for water, the ball valve for natural gas has higher requirement on sealing performance and can cause greater harm if leakage occurs in the using process.
In the existing ball valve structure, a valve rod is positioned on a valve seat and can only rotate in a positioning hole, and a valve ball is floating. When the ball valve in use is in a closed state, the air pressure on one side of the valve ball is larger than the air pressure on the other side, the valve ball can deviate towards the side with small air pressure, the valve rod cannot adapt to the valve ball to deviate, and then one end, connected with the valve ball, of the valve rod is subjected to transverse shear stress. This shear stress tends to damage the seal between the valve stem and the valve stem locating hole, thereby causing leakage in the ball valve.
Disclosure of Invention
The invention provides a ball valve, which aims to solve the problem that a sealing structure between a valve rod and a valve rod positioning hole is easy to damage in the existing ball valve so as to cause ball valve leakage, and the sealing structure between the valve rod and the valve rod positioning hole is not easy to damage so as to reduce the leakage possibility.
In order to achieve the purpose, the invention adopts the following technical scheme: a ball valve at least comprises a valve seat, a valve ball arranged in the valve seat and two connecting pipes arranged on two sides of the valve seat, wherein two sides of the valve ball are clamped and positioned through a positioning seat respectively, a first sealing ring which is attached to the outer wall of the valve ball is arranged on one side, facing the valve ball, of the two positioning seats, the upper side of the valve seat penetrates through the inner wall and the outer wall and is provided with a valve rod through hole, a valve rod and a double-joint universal joint are further arranged on the valve seat, the lower section of the valve rod is located in the valve rod through hole, the valve rod is in rotary sealing fit with the valve rod through hole through a rotary sealing mechanism, a universal joint positioning hole is formed in the lower end of the valve rod, the double-joint universal joint is longitudinally arranged and sequentially divided into an upper joint, a middle joint and a lower joint from top to bottom; the lower end of the lower section is connected with the top of the valve ball and can drive the valve ball to rotate.
Preferably, a sliding seat is arranged in an inner hole of the valve seat between the two positioning seats, the sliding seat is in a horizontal cylindrical shape, the outer wall of the sliding seat is in sliding sealing fit with the inner wall of the valve seat, the valve ball is arranged in a tube hole of the sliding seat, a second sealing ring for clamping and tightly sealing the valve ball and a limiting ring for positioning the second sealing ring are arranged on two sides of the inner wall of the tube hole of the sliding seat, and a through hole for allowing the double-joint universal joint to pass through is formed in the tube wall of the sliding seat.
Preferably, the bottom of the valve ball is provided with a rotating positioning hole, and a rotating shaft matched with the rotating positioning hole is arranged in the hole of the sliding seat pipe.
Preferably, a positioning chuck is circumferentially arranged on the outer wall of the valve rod, a positioning boss is arranged on the valve seat positioned on the outer side of the through hole of the valve rod, an inner sleeve is clamped outside the positioning boss, an outer sleeve is clamped outside the inner sleeve, the inner sleeve comprises an inner cylinder body longitudinally arranged and a lower sealing plate which is positioned at the top of the inner cylinder body and extends inwards and horizontally in a turnover manner, and the inner cylinder body is hermetically sleeved on the outer side of the positioning boss; the outer sleeve comprises an outer barrel body which is longitudinally arranged and an upper sealing plate which is positioned at the top of the outer barrel body and extends inwards and horizontally in a turnover mode, the outer barrel body is sleeved outside the inner barrel body in a sealing mode, the upper sealing plate is positioned above the lower sealing plate, and the positioning chuck is positioned between the upper sealing plate and the lower sealing plate.
Preferably, an upper sealing ring is arranged between the upper surface of the positioning chuck and the lower surface of the upper sealing plate, and a lower sealing ring is arranged between the lower surface of the positioning chuck and the upper surface of the lower sealing plate.
Preferably, the valve rod is sleeved with an O-shaped sealing ring, and the O-shaped sealing ring is in rotary sealing fit with the through hole of the valve rod.
Preferably, the valve rod locking mechanism comprises a positioning sleeve and a lifting ring, the positioning sleeve is coaxially embedded in the valve rod through hole, the valve rod is in rotary sealing fit with the valve rod through hole through the positioning sleeve, a plurality of O-shaped sealing rings are sleeved on the valve rod, and the O-shaped sealing rings are in rotary sealing fit with the inner wall of the positioning sleeve; a slide way and an air pressure channel are arranged in the positioning sleeve, the slide way is vertically arranged, an opening at the upper end of the slide way is positioned on the end surface of the top of the positioning sleeve, an opening at the lower end of the slide way is communicated with one end of the air pressure channel, and the other end of the air pressure channel is communicated to an inner cavity of a through hole of the valve rod below the; the lifting ring is transversely arranged right above the positioning sleeve, a plurality of guide rods are arranged on the lower side of the lifting ring, sliding blocks are arranged at the lower ends of the guide rods, the sliding blocks correspond to the slide ways one by one, and the sliding blocks are arranged in the slide ways and are in sliding sealing fit with the corresponding slide ways; the guide rod is sleeved with a compression spring used for returning the lifting ring to the lowest position; the upper side of the lifting ring is provided with a lower end face ratchet wheel with upward ratchets, an upper end face ratchet wheel matched with the lower end face ratchet wheel is arranged above the lower end face ratchet wheel, and the upper end face ratchet wheel is fixed with the valve rod.
Therefore, the invention has the following beneficial effects: 1. the valve rod and the valve ball are indirectly connected through the double-joint universal joint, the valve rod can drive the valve ball to rotate, the valve rod can adapt to the floating of the valve ball, and the valve rod cannot be subjected to transverse shear stress, so that a sealing structure between the valve rod and a valve rod positioning hole is protected; 2. the valve ball is positioned in a sliding seat, a second sealing ring is arranged between the sliding seat and the valve ball, and when leakage occurs between the valve ball and the first sealing ring on the positioning seat, the valve ball can still be sealed through the second sealing ring on the sliding seat; 3. be provided with the rotation axis on the sliding seat, the rotation axis is used for supplementary valve ball location for the valve ball can only be followed vertical axis and made rotatoryly, more does benefit to the valve rod and drives the valve ball rotatory.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a top view of the present invention.
FIG. 3 is a sectional view of the first embodiment.
Fig. 4 is an enlarged view at a in fig. 5.
Fig. 5 is a sectional view of the positioning seat and the first seal ring of the present invention.
FIG. 6 is a schematic view of the construction of a double-jointed gimbal according to the present invention.
Fig. 7 is a sectional view of the sliding seat in the present invention.
Fig. 8 is a schematic structural view of the sliding seat of the present invention.
FIG. 9 is a schematic view of the valve stem according to the first embodiment.
Figure 10 is a cross-sectional view of the inner and outer sleeves of the present invention.
FIG. 11 is a schematic view of the valve stem of the first embodiment after installation.
FIG. 12 is a sectional view of the second embodiment.
Fig. 13 is an enlarged view at b in fig. 12.
FIG. 14 is a schematic view showing the structure of a valve stem according to the second embodiment.
Fig. 15 is a schematic structural view of a lifting ring in the second embodiment.
FIG. 16 is a sectional view of the third embodiment.
Fig. 17 is an enlarged view at c in fig. 16.
FIG. 18 is a sectional view of the fourth embodiment.
Fig. 19 is an enlarged view at d in fig. 18.
1: a valve seat; 101: positioning the boss; 2: a valve ball; 3: taking over a pipe; 4: positioning seats; 5: a first seal ring; 6: a valve stem through hole; 7: a valve stem; 701: positioning holes of the universal joint; 702: positioning the chuck; 703: an upper sealing ring; 704: a lower seal ring; 705: an O-shaped sealing ring; 8: a double-joint universal joint; 801: an upper section; 802: a middle section; 803: a lower section; 9: a sliding seat; 901: a second seal ring; 902: a limiting ring; 903: a through hole; 904: a rotating shaft; 10: an inner sleeve; 1001: an inner cylinder; 1002: a lower sealing plate; 11: an outer sleeve; 1101: an outer cylinder; 1102: an upper sealing plate; 12: a valve stem locking mechanism; 1201: a positioning sleeve; 1202: a lifting ring; 1203: a slideway; 1204: an air pressure channel; 1205: a guide bar; 1206: a slider; 1207: a compression spring; 1208: a lower end surface ratchet wheel; 1209: an upper end surface ratchet wheel; 13: a valve stem sealing mechanism; 1301: an inflatable seal ring; 1302: a sealing ring limiting groove; 1303: and an inflation channel.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example one
Referring to fig. 1 to 11, the ball valve described in this embodiment at least includes a valve seat 1, a valve ball 2 disposed in the valve seat 1, and two connection pipes 3 disposed at two sides of the valve seat 1, two sides of the valve ball 2 are respectively clamped and positioned by a positioning seat 4, a first sealing ring 5 attached and sealed with an outer wall of the valve ball 2 is disposed on one side of the two positioning seats 4 facing the valve ball 2, and a valve rod through hole 6 is disposed on an upper side of the valve seat 1 and penetrates through the inner and outer walls.
The valve seat 1 is further provided with a valve rod 7 and a double-joint universal joint 8, the lower section of the valve rod 7 is located in the valve rod through hole 6, the valve rod 7 and the valve rod through hole 6 are in rotary sealing fit through a rotary sealing mechanism, the rotary sealing mechanism is characterized in that a plurality of O-shaped sealing rings 705 are sleeved on the valve rod 7, and the O-shaped sealing rings 705 are in rotary sealing fit with the valve rod through hole 6. The lower end of the valve rod 7 is provided with a universal joint positioning hole 701, the double-joint universal joint 8 is longitudinally arranged and sequentially divided into an upper joint 801, a middle joint 802 and a lower joint 803 from top to bottom, the upper section of the upper joint 801 slidably extends into the universal joint positioning hole 701 at the lower end of the valve rod 7, and the upper joint 801 and the universal joint positioning hole 701 cannot rotate relatively; the lower end of the lower joint 803 is fixedly connected with the top of the valve ball 2, and the valve rod 7 can drive the valve ball 2 to rotate through the double-joint universal joint 8.
A sliding seat 9 is arranged in an inner hole of the valve seat 1 between the two positioning seats 4, the sliding seat 9 is in a horizontal cylindrical shape, the outer wall of the sliding seat 9 is in sliding sealing fit with the inner wall of the valve seat 1, the sliding seat 9 can transversely move left and right on the valve seat 1, the valve ball 2 is arranged in a pipe hole of the sliding seat 9, a second sealing ring 901 for clamping the valve ball 2 tightly and a limiting ring 902 for positioning the second sealing ring 901 are arranged on two sides of the inner wall of the pipe hole of the sliding seat 9, and a through hole 903 for allowing the double-joint universal joint 8 to pass through is formed in the pipe wall of the sliding seat 9. The bottom of the valve ball 2 is provided with a rotary positioning hole, a rotary shaft 904 matched with the rotary positioning hole is arranged in the hole of the sliding seat 9, the rotary shaft 904 is arranged on the sliding seat 9, and the rotary shaft 904 is used for assisting the positioning of the valve ball 2, so that the valve ball 2 can only rotate along a vertical axis, and the valve rod 7 is more beneficial to driving the valve ball 2 to rotate.
A positioning chuck 702 is circumferentially arranged on the outer wall of the valve rod 7, a positioning boss 101 is arranged on the valve seat 1 positioned on the outer side of the through hole 6 of the valve rod, an inner sleeve 10 is clamped outside the positioning boss 101, an outer sleeve 11 is clamped outside the inner sleeve 10, the inner sleeve 10 comprises an inner cylinder 1001 which is longitudinally arranged and a lower sealing plate 1002 which is positioned at the top of the inner cylinder 1001 and extends inwards and horizontally in a turnover manner, and the inner cylinder 1001 is hermetically sleeved on the outer side of the positioning boss 101; the outer sleeve 11 comprises an outer cylinder 1101 arranged longitudinally and an upper sealing plate 1102 located at the top of the outer cylinder 1101 and extending inwards and horizontally in a folding mode, the outer cylinder 1101 is sealed and connected to the outer side of the inner cylinder 1001, the upper sealing plate 1102 is located above the lower sealing plate 1002, and the positioning chuck 702 is located between the upper sealing plate 1102 and the lower sealing plate 1002. An upper sealing ring 703 is arranged between the upper surface of the positioning chuck 702 and the lower surface of the upper sealing plate 1102, and a lower sealing ring 704 is arranged between the lower surface of the positioning chuck 702 and the upper surface of the lower sealing plate 1002.
This embodiment is connected indirectly through double-joint universal joint 8 between with valve rod 7 and the valve ball 2, can drive the valve ball 2 rotation through valve rod 7, can let valve rod 7 adapt to the valve ball 2 again and float, and valve rod 7 can not receive horizontal shear stress, prevents that the seal structure of valve rod 7 department from being destroyed. When the valve ball 2 deviates left and right in the use process, the lower joint 803 of the double-joint universal joint 8 can move horizontally along with the valve ball 2, and the upper joint 801 can slide up and down in the universal joint positioning hole 701 at the lower end of the valve rod 7 through the hinged connection of the two ends of the middle joint 802 so as to adapt to the deviation of the valve ball 2.
Still another reason why the leakage occurs in the ball valve stem 7 is that when the valve ball 2 in the closed state is displaced, the sealing property between the valve ball 2 and the first seal ring 5 on the side where the gas pressure is large is deteriorated, and the natural gas easily leaks from the position into the stem through-hole 6. This embodiment is fixed a position valve ball 2 in a sliding seat 9, be sliding seal cooperation between 9 outer walls of sliding seat and the 1 inner wall of disk seat, and be equipped with second sealing washer 901 between sliding seat 9 and the valve ball 2, when taking place to leak between first sealing washer 5 on valve ball 2 and the positioning seat 4, still can realize sealing through second sealing washer 901 on the sliding seat 9 to valve ball 2, prevent that the natural gas from entering into valve rod through hole 6 in, further reduced the possibility that the natural gas leaked from valve rod 7.
Meanwhile, the positioning chuck 702 which is integrally formed is arranged on the outer wall of the valve rod 7 in the circumferential direction, and a sealing structure is arranged between the upper surface and the lower surface of the positioning chuck 702 and between the inner sleeve 10 and the outer sleeve 11, so that even natural gas leaks into the through hole 6 of the valve rod, the natural gas cannot leak out of the ball valve from the valve rod 7, and the use safety of the ball valve is further improved.
Example two
Referring to fig. 12 to 15, the present embodiment further improves on the first embodiment as follows:
the valve rod locking mechanism 12 comprises a positioning sleeve 1201 and a lifting ring 1202, the positioning sleeve 1201 is coaxially embedded in the valve rod through hole 6, the valve rod 7 is in rotary sealing fit with the valve rod through hole 6 through the positioning sleeve 1201, a plurality of O-shaped sealing rings 705 are sleeved on the valve rod 7, and the O-shaped sealing rings 705 are in rotary sealing fit with the inner wall of the positioning sleeve 1201; a plurality of slide ways 1203 and a plurality of air pressure channels 1204 are arranged in the positioning sleeve 1201, the slide ways 1203 correspond to the air pressure channels 1204 one by one, the slide ways 1203 are vertically arranged, an opening at the upper end of the slide ways 1203 is positioned on the end surface of the top of the positioning sleeve 1201, an opening at the lower end of the slide ways is communicated with one end of the corresponding air pressure channel 1204, and the other end of the air pressure channel 1204 is communicated with an inner cavity of a valve; the lifting ring 1202 is transversely arranged right above the positioning sleeve 1201, a plurality of guide rods 1205 are arranged on the lower side of the lifting ring 1202, sliding blocks 1206 are arranged at the lower ends of the guide rods 1205, the sliding blocks 1206 are in one-to-one correspondence with the sliding ways 1203, and the sliding blocks 1206 are arranged in the sliding ways 1203 and are in sliding sealing fit with the corresponding sliding ways 1203; a compression spring 1207 for returning the lifting ring 1202 to the lowest position is sleeved on the guide rod 1205; a lower end surface ratchet wheel 1208 with upward ratchets is arranged on the upper side of the lifting ring 1202, an upper end surface ratchet wheel 1209 matched with the lower end surface ratchet wheel 1208 is arranged above the lower end surface ratchet wheel 1208, and the upper end surface ratchet wheel 1209 is fixed with the valve rod 7.
Through setting up dead lock mechanism 12 of valve rod, when natural gas leaked to the valve rod through-hole 6 inner chamber of valve rod 7 below, the atmospheric pressure of valve rod through-hole 6 inner chamber will increase, and then promoted the slider 1206 in the slide 1203 through atmospheric pressure passageway 1204 and rise, and the lifting ring 1202 passes through guide bar 1205 to be connected with slider 1206, therefore, whole lifting ring 1202 can follow the slider 1206 and rise. When the lifting ring 1202 is lifted, the lower end ratchet 1208 on the upper side of the lifting ring 1202 engages with the upper end ratchet 1209 fixed to the stem 7, thereby locking the stem 7. One will no longer be able to rotate the valve stem 7 and thereby reduce the possibility of natural gas leaking from the valve stem 7.
EXAMPLE III
Referring to fig. 16 to 17, the present embodiment further improves the following on the basis of the first embodiment:
the valve rod sealing mechanism 13 comprises a positioning sleeve 1201 and an inflatable sealing ring 1301, the positioning sleeve 1201 is coaxially embedded in the valve rod through hole 6, the valve rod 7 is in rotary sealing fit with the valve rod through hole 6 through the positioning sleeve 1201, a plurality of O-shaped sealing rings 705 are sleeved on the valve rod 7, and the O-shaped sealing rings 705 are in rotary sealing fit with the inner wall of the positioning sleeve 1201; a sealing ring limiting groove 1302 is annularly arranged on the inner wall of the positioning sleeve 1201, and the inflatable sealing ring 1301 is arranged in the sealing ring limiting groove 1302 and annularly arranged on the outer side of the valve rod 7; an inflation channel 1303 is arranged in the positioning sleeve 1201, one end of the inflation channel 1303 is communicated with the inflation sealing ring 1301, and the other end of the inflation channel 1303 is communicated with an inner cavity of the valve rod through hole 6 below the valve rod 7.
Through setting up valve rod sealing mechanism 13, when natural gas leaked the valve rod through hole 6 inner chamber to valve rod 7 below, the atmospheric pressure of valve rod through hole 6 inner chamber will increase, and then gets into inflatable seal 1301 through inflation channel 1303, and inflatable seal 1301 atress inflation holds valve rod 7 tightly, keeps apart into two cavitys with inflatable seal 1301 as the boundary line with valve rod 7 outside for valve rod 7 department more one deck is sealed, and the natural gas in the disk seat 1 is more difficult for leaking from valve rod 7.
Example four
Referring to fig. 18 to 19, the present embodiment further improves on the first embodiment as follows:
the valve rod locking mechanism 12 comprises a positioning sleeve 1201 and a lifting ring 1202, the positioning sleeve 1201 is coaxially embedded in the valve rod through hole 6, the valve rod 7 is in rotary sealing fit with the valve rod through hole 6 through the positioning sleeve 1201, a plurality of O-shaped sealing rings 705 are sleeved on the valve rod 7, and the O-shaped sealing rings 705 are in rotary sealing fit with the inner wall of the positioning sleeve 1201; a plurality of slide ways 1203 and a plurality of air pressure channels 1204 are arranged in the positioning sleeve 1201, the slide ways 1203 correspond to the air pressure channels 1204 one by one, the slide ways 1203 are vertically arranged, an opening at the upper end of the slide ways 1203 is positioned on the end surface of the top of the positioning sleeve 1201, an opening at the lower end of the slide ways is communicated with one end of the corresponding air pressure channel 1204, and the other end of the air pressure channel 1204 is communicated with an inner cavity of a valve; the lifting ring 1202 is transversely arranged right above the positioning sleeve 1201, a plurality of guide rods 1205 are arranged on the lower side of the lifting ring 1202, sliding blocks 1206 are arranged at the lower ends of the guide rods 1205, the sliding blocks 1206 are in one-to-one correspondence with the sliding ways 1203, and the sliding blocks 1206 are arranged in the sliding ways 1203 and are in sliding sealing fit with the corresponding sliding ways 1203; a compression spring 1207 for returning the lifting ring 1202 to the lowest position is sleeved on the guide rod 1205; a lower end surface ratchet wheel 1208 with upward ratchets is arranged on the upper side of the lifting ring 1202, an upper end surface ratchet wheel 1209 matched with the lower end surface ratchet wheel 1208 is arranged above the lower end surface ratchet wheel 1208, and the upper end surface ratchet wheel 1209 is fixed with the valve rod 7.
The valve rod sealing mechanism 13 at least comprises an inflatable sealing ring 1301, a sealing ring limiting groove 1302 is annularly arranged on the inner wall of the positioning sleeve 1201, and the inflatable sealing ring 1301 is arranged in the sealing ring limiting groove 1302 and annularly arranged on the outer side of the valve rod 7; an inflation channel 1303 is arranged in the positioning sleeve 1201, one end of the inflation channel 1303 is communicated with the inflation sealing ring 1301, and the other end of the inflation channel 1303 is communicated with an inner cavity of the valve rod through hole 6 below the valve rod 7.
Through setting up dead lock mechanism 12 of valve rod, when natural gas leaked to the valve rod through-hole 6 inner chamber of valve rod 7 below, the atmospheric pressure of valve rod through-hole 6 inner chamber will increase, and then promoted the slider 1206 in the slide 1203 through atmospheric pressure passageway 1204 and rise, and the lifting ring 1202 passes through guide bar 1205 to be connected with slider 1206, therefore, whole lifting ring 1202 can follow the slider 1206 and rise. When the lifting ring 1202 is lifted, the lower end ratchet 1208 on the upper side of the lifting ring 1202 engages with the upper end ratchet 1209 fixed to the stem 7, thereby locking the stem 7. One will no longer be able to rotate the valve stem 7 and thereby reduce the possibility of natural gas leaking from the valve stem 7.
Through setting up valve rod sealing mechanism 13, when natural gas leaked the valve rod through hole 6 inner chamber to valve rod 7 below, the atmospheric pressure of valve rod through hole 6 inner chamber will increase, and then gets into inflatable seal 1301 through inflation channel 1303, and inflatable seal 1301 atress inflation holds valve rod 7 tightly, keeps apart into two cavitys with inflatable seal 1301 as the boundary line with valve rod 7 outside for valve rod 7 department more one deck is sealed, and the natural gas in the disk seat 1 is more difficult for leaking from valve rod 7.

Claims (6)

1. The utility model provides a ball valve, includes disk seat (1) at least, locates valve ball (2) in disk seat (1) and locates two takeover (3) of disk seat (1) both sides, and valve ball (2) both sides respectively press from both sides tight location through a locating seat (4), all are equipped with first sealing washer (5) with valve ball (2) outer wall laminating towards valve ball (2) one side on two locating seats (4), disk seat (1) upside is run through the inside and outside wall and is equipped with a valve rod through hole (6), its characterized in that:
the valve seat (1) is further provided with a valve rod (7) and a double-joint universal joint (8), the lower section of the valve rod (7) is located in the valve rod through hole (6), the valve rod (7) is in rotary sealing fit with the valve rod through hole (6) through a rotary sealing mechanism, a universal joint positioning hole (701) is formed in the lower end of the valve rod (7), the double-joint universal joint (8) is longitudinally arranged and sequentially divided into an upper joint (801), a middle joint (802) and a lower joint (803) from top to bottom, the upper section of the upper joint (801) slidably extends into the universal joint positioning hole (701) in the lower end of the valve rod (7), and the upper joint (801) and the universal joint positioning hole (701) cannot rotate relatively; the lower end of the lower section (803) is connected with the top of the valve ball (2) and can drive the valve ball (2) to rotate;
the valve rod locking mechanism (12) comprises a positioning sleeve (1201) and a lifting ring (1202), the positioning sleeve (1201) is coaxially embedded in the valve rod through hole (6), the valve rod (7) is in rotary sealing fit with the valve rod through hole (6) through the positioning sleeve (1201), a plurality of O-shaped sealing rings (705) are sleeved on the valve rod (7), and the O-shaped sealing rings (705) are in rotary sealing fit with the inner wall of the positioning sleeve (1201); a slide way (1203) and an air pressure channel (1204) are arranged in the positioning sleeve (1201), the slide way (1203) is vertically arranged, an opening at the upper end of the slide way (1203) is positioned on the top end surface of the positioning sleeve (1201), an opening at the lower end of the slide way is communicated with one end of the air pressure channel (1204), and the other end of the air pressure channel (1204) is communicated to an inner cavity of a valve rod through hole (6) below the valve rod (7); the lifting ring (1202) is transversely arranged right above the positioning sleeve (1201), a plurality of guide rods (1205) are arranged on the lower side of the lifting ring (1202), sliding blocks (1206) are arranged at the lower ends of the guide rods (1205), the sliding blocks (1206) correspond to the sliding ways (1203) one by one, and the sliding blocks (1206) are arranged in the sliding ways (1203) and are in sliding sealing fit with the corresponding sliding ways (1203); a compression spring (1207) used for returning the lifting ring (1202) to the lowest position is sleeved on the guide rod (1205); the upper side of the lifting ring (1202) is provided with a lower end face ratchet wheel (1208) with upward ratchets, an upper end face ratchet wheel (1209) matched with the lower end face ratchet wheel (1208) is arranged above the lower end face ratchet wheel (1208), and the upper end face ratchet wheel (1209) is fixed with the valve rod (7).
2. The ball valve according to claim 1, wherein: be located and be equipped with a sliding seat (9) in disk seat (1) hole between two positioning seats (4), sliding seat (9) are horizontal cylindricly, are sliding seal cooperation between sliding seat (9) outer wall and disk seat (1) inner wall, valve ball (2) are located sliding seat (9) tube hole, and sliding seat (9) tube hole inner wall both sides are equipped with second sealing washer (901) that are used for pressing from both sides tight sealing valve ball (2) and are used for fixing a position spacing ring (902) of second sealing washer (901), offer through-hole (903) that are used for two sections universal joint (8) to pass on sliding seat (9) tube wall.
3. The ball valve of claim 2, wherein: the bottom of the valve ball (2) is provided with a rotary positioning hole, and a rotary shaft (904) matched with the rotary positioning hole is arranged in the pipe hole of the sliding seat (9).
4. The ball valve according to claim 1, wherein: the valve rod positioning structure is characterized in that a positioning chuck (702) is circumferentially arranged on the outer wall of the valve rod (7), a positioning boss (101) is arranged on the valve seat (1) positioned on the outer side of the valve rod through hole (6), an inner sleeve (10) is clamped outside the positioning boss (101), an outer sleeve (11) is clamped outside the inner sleeve (10), the inner sleeve (10) comprises an inner cylinder body (1001) which is longitudinally arranged and a lower sealing plate (1002) which is positioned on the top of the inner cylinder body (1001) and extends inwards and horizontally in a turnover mode, and the inner cylinder body (1001) is hermetically sleeved on the outer side of the positioning boss (101); the outer sleeve (11) comprises a longitudinally arranged outer cylinder body (1101) and an upper sealing plate (1102) located at the top of the outer cylinder body (1101) and extending inwards and horizontally in a turnover mode, the outer cylinder body (1101) is sleeved outside the inner cylinder body (1001) in a sealing mode, the upper sealing plate (1102) is located above the lower sealing plate (1002), and the positioning chuck (702) is located between the upper sealing plate (1102) and the lower sealing plate (1002).
5. The ball valve according to claim 4, wherein: an upper sealing ring (703) is arranged between the upper surface of the positioning chuck (702) and the lower surface of the upper sealing plate (1102), and a lower sealing ring (704) is arranged between the lower surface of the positioning chuck (702) and the upper surface of the lower sealing plate (1002).
6. The ball valve according to claim 1, wherein: the valve rod (7) is sleeved with an O-shaped sealing ring (705), and the O-shaped sealing ring (705) is in rotary sealing fit with the valve rod through hole (6).
CN201811580758.1A 2018-12-24 2018-12-24 Ball valve Active CN109578611B (en)

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4606372A (en) * 1985-05-29 1986-08-19 United States Brass Corporation Faucet valve bonnet locking means
CN202252076U (en) * 2011-09-14 2012-05-30 三一重工股份有限公司 Overlapped ball valve and overlapped valve group
US9709189B2 (en) * 2014-02-28 2017-07-18 Itt Manufacturing Enterprises Llc Final position locking feature of multi-turn rotational device having an axially translating wheel or a clocked lock passage gear
CN104344004A (en) * 2014-10-23 2015-02-11 赵继鹏 Angle toggle electric valve device prepared from manual ball valve and additionally mounted micro gear motor
CN108916445B (en) * 2018-08-23 2020-01-31 长沙星沙新奥燃气有限公司 polyethylene ball valve
CN108953658B (en) * 2018-08-23 2019-09-10 远大阀门集团有限公司 A kind of ball valve

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