Gate valve with lubricating function

Abstract

The gate valve with the lubricating function comprises a valve body and an upper cover, the upper cover is arranged on the valve body, a water cut-off groove is formed in the valve body, a first water passing hole is formed in the middle of the side wall of the valve body, sealing rings are clamped to the two ends of the water cut-off groove, and a valve element gate plate is arranged in the water cut-off groove in a sliding mode; in the up-down sliding process of the valve rod, the lubricating mechanism fully lubricates the outer circumferential face of the valve rod, the valve rod slides relative to the contact positions of the first oil immersion packing, the second oil immersion packing, the first graphite and the second graphite, and lubricating oil flows into the oil seepage groove through the first oil outlet hole and the second oil outlet hole; the bottom of the first oil-immersed packing makes contact with lubricating oil, the lubricating oil permeates into the first oil-immersed packing, the second oil-immersed packing, the first graphite and the second graphite in sequence, the outer circumferential face of the valve rod is fully lubricated through the first oil-immersed packing, the second oil-immersed packing, the first graphite and the second graphite, abrasion of the surface of the valve rod is reduced, and the service life of the valve rod is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly relates to a gate valve with a lubricating function. Background Art

[0002] The opening and closing member of a gate valve is a gate plate. The moving direction of the gate plate is perpendicular to the fluid direction. A gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate plate has two sealing surfaces. In the most common type of gate valve, the two sealing surfaces form a wedge shape, and the wedge angle varies with the valve parameters.

[0003] The existing gate valve drives the gate plate to move up and down to open and close the passage through the threaded part of the valve stem cooperating with the ferrule for threaded transmission. As it is used, the valve stem continuously rubs against the valve cover, causing the surface of the valve stem to be continuously worn, resulting in the valve stem losing its function and having a short service life. After wear, the valve stem needs to be replaced, which is costly.

[0004] Therefore, it is necessary to provide a gate valve with a lubricating function to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a gate valve with a lubricating function to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A gate valve with a lubricating function, including a valve body and an upper cover. The upper cover is arranged on the valve body. A water intercepting groove is opened in the valve body. A first water passing hole is opened in the middle of the side wall of the valve body. Sealing rings are clamped at both ends of the water intercepting groove. A valve core gate plate is slidably arranged in the water intercepting groove. A first through hole is opened in the middle of the upper cover. A second sliding hole is opened at the bottom of the upper cover. A valve stem is slidably arranged in the second sliding hole. The valve stem includes a threaded part and a connecting head. The threaded part penetrates through the first through hole and extends above the top of the upper cover. The connecting head is clamped at the top of the valve core gate plate. A packing chamber is inserted into the first through hole. A gland is arranged at the top of the packing chamber. A first groove is opened in the middle of the top of the gland. A lubricating mechanism for lubricating the valve stem is inserted into the first groove. A second clamping groove is opened at the upper position of the upper cover. A rotating column is clamped in the second clamping groove. A fifth groove is opened at the bottom of the rotating column. The top of the lubricating mechanism is inserted into the fifth groove. The lubricating mechanism is sleeved on the valve stem. A handwheel is sleeved on the rotating column.

[0007] As a preferred technical solution of the present invention, the lubrication mechanism includes a copper sleeve. An installation groove is formed at the top of the copper sleeve, and a third sliding hole is formed at the bottom of the installation groove for the valve stem to pass through. An oil-impregnated packing I, an oil-impregnated packing II, graphite I, and graphite II are sequentially arranged in the installation groove from bottom to top. The top of the valve stem sequentially penetrates through the oil-impregnated packing I, the oil-impregnated packing II, graphite I, and graphite II, and the outer circumferential surface of the valve stem is in close fit with the inner walls of the oil-impregnated packing I, the oil-impregnated packing II, graphite I, and graphite II. An oil seepage groove is formed at the bottom of the installation groove. An oil-impregnated ring is formed at the bottom of the oil-impregnated packing I, and the oil-impregnated ring extends into the oil seepage groove and seals its top. The oil seepage groove is an annular groove, and six second oil outlet holes are evenly formed at the middle position of the bottom of the oil seepage groove. The six second oil outlet holes are distributed in an annular array. An oil storage groove is formed at the top of the copper sleeve. The oil storage groove is annular. Six first oil outlet holes are evenly formed on the inner wall of the oil storage groove. The six first oil outlet holes are distributed in an annular array. The six first oil outlet holes respectively communicate with the six second oil outlet holes in a one-to-one correspondence. An oil seal is arranged at the top of the copper sleeve, and a connecting ring is arranged at the bottom of the copper sleeve.

[0008] As a preferred technical solution of the present invention, an arc-shaped ring groove is formed at the middle of the bottom of the oil seepage groove. The cross-sectional shape of the arc-shaped ring groove is semi-circular, and the arc-shaped ring groove connects the tops of the six second oil outlet holes. A first convex block is arranged at the top of the oil seal, and the first convex block is inserted into the fifth groove. A second convex block is arranged at the bottom of the oil seal, and the second convex block is inserted into the oil storage groove and seals its top. A fourth groove is formed at the bottom of the oil seal. The fourth groove is an annular groove, and a sealing rubber ring is arranged in the fourth groove. The sealing rubber ring is pressed against the upper surface of the graphite II. A third groove is formed at the bottom of the copper sleeve. A first protrusion is arranged at the top of the connecting ring, and the first protrusion is inserted into the third groove. A second protrusion is arranged at the bottom of the connecting ring, and the second protrusion is inserted into the first groove of the pressure sleeve.

[0009] As a preferred technical solution of the present invention, the second sliding hole is located at the lower end of the first through hole, and the diameter of the second sliding hole is smaller than that of the first through hole. A receiving groove is formed at the bottom of the second sliding hole, and the structure of the receiving groove is frustum-shaped. The second clamping groove is located at the lower end of the first through hole. The top of the rotating column penetrates through the first through hole and extends above the upper cover. A rotating seat is arranged at the lower end of the rotating column, and the rotating seat is clamped in the second clamping groove. A second gasket is arranged at the connection between the rotating seat and the second clamping groove, and the second gasket is sleeved on the rotating column. A second connection hole is formed in the middle of the rotating column, and an internal thread is formed at the upper end of the second connection hole. The threaded portion of the valve stem is in threaded connection with the internal thread for transmission. The rotating column has a stepped shaft structure, an external thread is formed on the outer edge of the upper end of the rotating column, and six stop cutting grooves are formed on the outer edge of the stepped portion of the rotating column. The top of the stop cutting groove is located below the external thread, and the bottom of the stop cutting groove is located above the first through hole of the upper cover. A regular hexagonal hole is formed in the middle of the handwheel, and the regular hexagonal hole cooperates with the six stop cutting grooves for limiting. A second nut is in threaded connection with the external thread, and a first gasket is arranged between the top of the handwheel and the bottom of the second nut, and the first gasket is sleeved on the external thread.

[0010] As a preferred technical solution of the present invention, a first connection seat is arranged on one side of the valve body, a second connection seat is arranged on the other side of the valve body, the first water passing hole penetrates through the middle parts of the side walls of the first connection seat and the second connection seat, the first water passing hole is communicated with the water intercepting groove, and engaging grooves are formed at the joints of both ends of the water intercepting groove and the first water passing hole. The sealing ring includes a clamping ring, and the clamping ring is clamped in the engaging groove.

[0011] As a preferred technical solution of the present invention, the threaded portion sequentially penetrates through the receiving groove, the second sliding hole, the first through hole and the second clamping groove and extends above the top of the upper cover. A clamping portion is formed on the outer circumferential surface of the connecting head. The upper end of the valve core gate plate slides in the first sliding hole. A connecting groove is formed at the top of the side wall of the valve core gate plate, and the shape of the connecting groove is convex. The connecting groove is adapted to the outer shape of the clamping portion. First inclined surfaces are formed at the bottoms of both side walls of the valve core gate plate, and second chamfers are formed at the bottoms of the front and rear end faces of the valve core gate plate. The sealing ring further includes a clamping head, a second inclined surface is formed on the side wall of the clamping head, and the second inclined surface is adapted to the first inclined surface of the valve core gate plate. A third chamfer is formed on the side wall of the clamping head. A second water passing hole is formed in the middle of the sealing ring, and the second water passing hole is communicated with the first water passing hole and the water intercepting groove. A second groove is formed on the outer circumferential surface of the valve stem, and an O-shaped sealing ring is arranged in the second groove. The outer edge of the O-shaped sealing ring is attached to the inner wall of the second sliding hole.

[0012] As a preferred technical solution of the present invention, the first water passing hole structure is a stepped hole. Four mounting holes are provided on the side walls of the first connecting seat and the second connecting seat, and the four mounting holes are arranged in a circular array centered on the first water passing hole. A third connecting seat is provided at the upper end of the middle part of the valve body. The structure of the third connecting seat is square. A first sliding hole is provided in the middle of the third connecting seat, and the first sliding hole communicates with the water intercepting groove. A first cutting groove is provided in the middle of the upper surface of the third connecting seat. A sealing ring is arranged in the first cutting groove. A first clamping groove is provided at the bottom of the first cutting groove. A convex ring is provided at the bottom of the upper cover, and the convex ring is inserted into the first clamping groove, and the outer shapes of the convex ring and the first clamping groove are adapted. The bottom of the upper cover presses against the sealing ring to seal the first cutting groove.

[0013] As a preferred technical solution of the present invention, threaded connection holes are provided at the four corners of the upper surface of the third connecting seat, and locking holes are provided at the four corners of the bottom of the upper cover. The four locking holes are arranged in one-to-one correspondence with the four threaded connection holes. A first bolt is arranged in the locking hole, and the thread of the first bolt is screwed into the threaded connection hole.

[0014] As a preferred technical solution of the present invention, a first insertion hole is provided in the middle of the pressure sleeve for the valve stem to pass through. Second insertion holes are provided at both ends of the pressure sleeve. A second bolt is inserted into the second insertion hole. The bottom structure of the second bolt is a spherical head. A connecting shaft is inserted at the bottom of the second bolt. Mounting rib plates are provided at both ends of the middle part of the upper cover. A first connection hole is provided on the front surface of the mounting rib plate. Both ends of the connecting shaft are inserted into the first connection hole. A first nut is threadedly connected to the top of the second bolt.

[0015] As a preferred technical solution of the present invention, a through hole is provided in the middle of the stuffing box, and the valve stem passes through the through hole. A snap ring is provided at the top of the stuffing box. A first chamfer is provided at the top of the snap ring. A fourth chamfer is provided at the bottom of the pressure sleeve, and the fourth chamfer is adapted to the first chamfer of the stuffing box.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. A gate valve with a lubricating function according to the present invention. In the present invention, sealing rings are respectively installed at both ends of the valve core gate plate. When the valve core gate plate slides downward, the two first inclined surfaces of the valve core gate plate are respectively close to and fit with the second inclined surfaces of the two sealing rings. When the valve core gate plate slides to the lowermost end, the first inclined surface and the second inclined surface are completely fitted and pressed, thereby completely closing the water intercepting groove of the valve body to achieve the closing of the gate valve. When the valve needs to be opened, the handwheel is rotated to drive the rotating column to rotate. The internal thread of the rotating column cooperates with the threaded portion of the valve rod for threaded transmission, thereby driving the valve rod to slide upward. The valve core gate plate slides upward along the water intercepting groove and the first sliding hole, so that the first inclined surface of the valve core gate plate is separated from the second inclined surfaces of the two sealing rings. At this time, the first water passing hole is communicated with the water intercepting groove, and the gate valve is opened. The gate valve is opened and the flow rate of the gate valve is adjusted by rotating the handwheel to adjust the positions of the valve rod and the valve core gate plate, and the adjustment is convenient and fast.

[0018] 2. A gate valve with a lubricating function according to the present invention. During the up and down sliding process of the valve rod, the lubricating mechanism fully lubricates the outer circumferential surface of the valve rod. During the use of the gate valve, the valve rod slides relatively with the first oil-impregnated packing, the second oil-impregnated packing, the first graphite and the second graphite. The lubricating oil flows into the oil seepage groove through the first oil outlet hole and the second oil outlet hole. The lubricating oil slowly accumulates in the arc-shaped ring groove until the oil seepage groove is full. The bottom of the first oil-impregnated packing contacts the lubricating oil and permeates the lubricating oil to the first oil-impregnated packing, the second oil-impregnated packing, the first graphite and the second graphite in sequence. The outer circumferential surface of the valve rod is fully lubricated by the first oil-impregnated packing, the second oil-impregnated packing, the first graphite and the second graphite, reducing the wear on the surface of the valve rod and extending the service life of the valve rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a front view of the overall structure of the present invention;

[0022] Figure 3 is a sectional view of the overall structure of the present invention;

[0023] Figure 4 is a three-dimensional exploded schematic diagram of the overall structure of the present invention;

[0024] Figure 5 is a three-dimensional schematic diagram of the valve body structure of the present invention;

[0025] Figure 6 is a sectional view of the valve body structure of the present invention;

[0026] Figure 7 is a three-dimensional schematic diagram of the upper cover structure of the present invention;

[0027] Figure 8 is the three-dimensional front view of the upper cover structure of the present invention;

[0028] Figure 9 is the three-dimensional schematic diagram of the bushing structure of the present invention;

[0029] Figure 10 is the three-dimensional schematic diagram of the valve stem structure of the present invention;

[0030] Figure 11 is the three-dimensional schematic diagram of the stuffing box structure of the present invention;

[0031] Figure 12 is the three-dimensional schematic diagram of the lubrication mechanism structure of the present invention;

[0032] Figure 13 is the three-dimensional exploded view of the lubrication mechanism structure of the present invention;

[0033] Figure 14 is the three-dimensional schematic diagram of the copper bushing structure of the present invention;

[0034] Figure 15 is the cross-sectional view of the copper bushing structure of the present invention;

[0035] Figure 16 is the three-dimensional schematic diagram of the oil seal structure of the present invention;

[0036] Figure 17 is the three-dimensional schematic diagram of the rotating column structure of the present invention;

[0037] Figure 18 is the cross-sectional view of the rotating column structure of the present invention;

[0038] Figure 19 is the three-dimensional schematic diagram of the valve core gate structure of the present invention;

[0039] Figure 20 is the three-dimensional schematic diagram of the sealing ring structure of the present invention;

[0040] Figure 21 is the front view of the sealing ring structure of the present invention.

[0041] In the figure: 1. Valve body; 101. First connection seat; 1011. Mounting hole; 102. Second connection seat; 103. Third connection seat; 1031. First sliding hole; 1032. First card slot; 1033. Threaded connection hole; 1034. First cut groove; 104. First water passing hole; 105. Engaging groove; 106. Water intercepting groove; 2. Upper cover; 201. First through hole; 202. Second card slot; 203. Second sliding hole; 204. Convex ring; 205. Accommodating groove; 206. Mounting rib plate; 207. First connection hole; 208. Locking hole; 3. Compression sleeve; 31. First jack; 32. Second jack; 33. First groove; 34. Fourth chamfer; 4. Valve stem; 41. Threaded part; 42. Connection head; 43. Clamping part; 44. Second groove; 5. Packing chamber; 501. Through hole; 51. Snap ring; 52. First chamfer; 6. Lubricating mechanism; 61. Copper sleeve; 611. Mounting groove; 612. Third sliding hole; 613. Oil storage tank; 614. First oil outlet hole; 615. Second oil outlet hole; 616. Oil seepage groove; 617. Arc-shaped ring groove; 618. Third groove; 62. Oil seal; 621. First convex block; 622. Second convex block; 623. Fourth groove; 63. First oil-impregnated packing; 64. Second oil-impregnated packing; 65. First graphite; 66. Second graphite; 67. Sealing rubber ring; 68. Connecting ring; 681. First protrusion; 682. Second protrusion; 7. Rotating column; 701. Second connection hole; 702. Fifth groove; 703. Internal thread; 71. Rotating seat; 72. External thread; 73. Stopping cut groove; 8. Spool gate; 81. Connection groove; 82. First inclined surface; 83. Second chamfer; 9. Sealing ring; 901. Second water passing hole; 91. Clamping ring; 92. Clamping head; 93. Third chamfer; 94. Second inclined surface; 10. Handwheel; 11. First bolt; 12. Second bolt; 13. Connecting shaft; 14. First nut; 15. Second nut; 16. First gasket; 17. Second gasket. Detailed implementation manners

[0042] The embodiments of the present invention will be described below with reference to the accompanying drawings. During this process, for the sake of clarity and convenience of description, we may exaggerate the widths of the lines or the sizes of the components in the drawings.

[0043] In addition, the terms used below are defined based on the functions in the present invention and may vary according to the intentions or conventions of users and operators. Therefore, these terms are defined based on the entire content of this specification.

[0044] As Figures 1 to 21As shown in the figure, a gate valve with a lubricating function includes a valve body 1 and an upper cover 2. The upper cover 2 is arranged on the valve body 1. A first connecting seat 101 is arranged on one side of the valve body 1, and a second connecting seat 102 is arranged on the other side of the valve body 1. A third connecting seat 103 is arranged at the upper end of the middle part of the valve body 1. A water intercepting groove 106 is formed inside the valve body 1. First water passing holes 104 are formed in the middle parts of the side walls of the first connecting seat 101 and the second connecting seat 102. The structure of the first water passing hole 104 is a stepped hole. The first water passing hole 104 communicates with the water intercepting groove 106. Engaging grooves 105 are formed at the joints of the water intercepting groove 106 and the two first water passing holes 104. A sealing ring 9 is clamped in the engaging groove 105. A valve core gate plate 8 is slidably arranged in the water intercepting groove 106. The valve core gate plate 8 cooperates with the two sealing rings 9 to realize the opening and closing of the gate valve. Four mounting holes 1011 are formed in the side walls of the first connecting seat 101 and the second connecting seat 102. The four mounting holes 1011 are distributed in a circular array centered on the first water passing hole 104. A first sliding hole 1031 is formed in the middle of the third connecting seat 103. The first sliding hole 1031 communicates with the water intercepting groove 106. The structure of the third connecting seat 103 is square. Threaded connection holes 1033 are formed at the four corners of the upper surface of the third connecting seat 103. A first cutting groove 1034 is formed in the middle of the upper surface of the third connecting seat 103. A sealing ring is arranged in the first cutting groove 1034 to prevent water from leaking at the joint of the upper cover 2 and the third connecting seat 103, and the sealing effect is good. A first clamping groove 1032 is formed at the bottom of the first cutting groove 1034. A convex ring 204 is arranged at the bottom of the upper cover 2. The convex ring 204 is inserted into the first clamping groove 1032, and the outer shapes of the convex ring 204 and the first clamping groove 1032 are adapted. The bottom of the upper cover 2 presses on the sealing ring to seal the first cutting groove 1034.

[0045] As Figures 5 to 8 shown, a first through hole 201 is formed in the middle of the upper cover 2, and a second sliding hole 203 is formed at the bottom of the upper cover 2. The second sliding hole 203 is located at the lower end of the first through hole 201, and the diameter of the second sliding hole 203 is smaller than that of the first through hole 201. A receiving groove 205 is formed at the bottom of the second sliding hole 203. The structure of the receiving groove 205 is frustum-shaped. Locking holes 208 are formed at the four corners of the bottom of the upper cover 2. The four locking holes 208 are arranged in one-to-one correspondence with the four threaded connection holes 1033. A first bolt 11 is arranged in the locking hole 208. The thread of the first bolt 11 is screwed into the threaded connection hole 1033 to lock the upper cover 2 on the top of the valve body 1. A second clamping groove 202 is formed at a position above the upper cover 2. The second clamping groove 202 is located at the lower end of the first through hole 201. A rotating column 7 is clamped in the second clamping groove 202. The top of the rotating column 7 penetrates through the first through hole 201 and extends above the upper cover 2.

[0046] AsFigure 10 and Figure 19 As shown, a valve rod 4 is slidably disposed in the second sliding hole 203. The valve rod 4 includes a threaded portion 41 and a connection head 42. The threaded portion 41 sequentially penetrates through the receiving groove 205, the second sliding hole 203, the first through hole 201, and the second clamping groove 202 and extends above the top of the upper cover 2. The top of the valve rod 4 penetrates through the rotating column 7 and is threadedly connected thereto. A clamping portion 43 is formed on the outer circumferential surface of the connection head 42. The upper end of the valve core gate plate 8 is slidably disposed in the first sliding hole 1031. A connection groove 81 is formed at the top of the side wall of the valve core gate plate 8. The shape of the connection groove 81 is convex. The connection groove 81 is adapted to the outer shape of the clamping portion 43. The valve core gate plate 8 is connected to the valve rod 4 by the cooperation of the connection groove 81 and the clamping portion 43. First inclined surfaces 82 are formed at the bottoms of both side walls of the valve core gate plate 8. Second chamfers 83 are formed at the bottoms of the front and rear end faces of the valve core gate plate 8. The sealing ring 9 includes a clamping ring 91 and a clamping head 92. The clamping ring 91 is clamped in the clamping groove 105. A second inclined surface 94 is formed on the side wall of the clamping head 92. The second inclined surface 94 is adapted to the first inclined surface 82 of the valve core gate plate 8. A third chamfer 93 is formed on the side wall of the clamping head 92. A second water passing hole 901 is formed in the middle of the sealing ring 9. The second water passing hole 901 communicates with the first water passing hole 104 and the water intercepting groove 106. A second groove 44 is formed on the outer circumferential surface of the valve rod 4. An O-shaped sealing ring is disposed in the second groove 44. The outer edge of the O-shaped sealing ring is attached to the inner wall of the second sliding hole 203, playing a role of sealing and preventing leakage.

[0047] As Figure 4 、 Figure 9 and Figure 11 shown, a packing chamber 5 is inserted into the first through hole 201. A through hole 501 is formed in the middle of the packing chamber 5. The valve rod 4 passes through the through hole 501. A clamping ring 51 is disposed at the top of the packing chamber 5. A first chamfer 52 is formed at the top of the clamping ring 51. A pressing sleeve 3 is disposed at the top of the packing chamber 5. A first insertion hole 31 is formed in the middle of the pressing sleeve 3. The first insertion hole 31 is for the valve rod 4 to pass through. Second insertion holes 32 are formed at both ends of the pressing sleeve 3. A second bolt 12 is inserted into the second insertion hole 32. The bottom structure of the second bolt 12 is a spherical head. A connecting shaft 13 is inserted at the bottom of the second bolt 12. Mounting rib plates 206 are disposed at both ends of the middle of the upper cover 2. A first connection hole 207 is formed on the front surface of the mounting rib plate 206. Both ends of the connecting shaft 13 are inserted into the first connection hole 207. A first nut 14 is threadedly connected to the top of the second bolt 12. The pressing sleeve 3 is locked to the upper cover 2 by the cooperation of the second bolt 12 and the first nut 14. A fourth chamfer 34 is formed at the bottom of the pressing sleeve 3. The fourth chamfer 34 cooperates with the first chamfer 52 of the packing chamber 5, thereby fixing and pressing the packing chamber 5 in the first through hole 201.

[0048] As shown Figures 12 to 16 in the figure, a first groove 33 is formed in the middle of the top of the bush 3, a lubricating mechanism 6 is inserted into the first groove 33, a fifth groove 702 is formed in the bottom of the rotating column 7, the top of the lubricating mechanism 6 is inserted into the fifth groove 702, the lubricating mechanism 6 includes a copper sleeve 61, an installation groove 611 is formed in the top of the copper sleeve 61, a third sliding hole 612 is formed in the bottom of the installation groove 611, the valve rod 4 passes through the third sliding hole 612, a first oil-impregnated packing 63, a second oil-impregnated packing 64, a first graphite 65 and a second graphite 66 are sequentially arranged in the installation groove 611 from bottom to top, the top of the valve rod 4 sequentially penetrates through the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66, and the outer circumferential surface of the valve rod 4 is in close fit with the inner walls of the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66. The valve rod 4 is lubricated by the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66, so as to prevent the valve rod 4 from being corroded, rusted and severely worn after being used for a period of time, and the lubrication effect is good. An oil seepage groove 616 is formed in the bottom of the installation groove 611, an oil-impregnated ring is formed in the bottom of the first oil-impregnated packing 63, the oil-impregnated ring extends into the oil seepage groove 616 and closes the top thereof, so as to reduce the overflow of oil liquid. The oil seepage groove 616 is an annular groove, six second oil outlet holes 615 are uniformly formed in the middle position of the bottom of the oil seepage groove 616, the six second oil outlet holes 615 are distributed in an annular array, an arc-shaped ring groove 617 is formed in the middle of the bottom of the oil seepage groove 616, the cross-sectional shape of the arc-shaped ring groove 617 is semi-circular, the arc-shaped ring groove 617 communicates with the tops of the six second oil outlet holes 615. A storage oil groove 613 is formed in the top of the copper sleeve 61, the storage oil groove 613 is annular, six first oil outlet holes 614 are uniformly formed in the inner wall of the storage oil groove 613, the six first oil outlet holes 614 are distributed in an annular array, and the six first oil outlet holes 614 respectively communicate with the six second oil outlet holes 615 in one-to-one correspondence. An oil seal 62 is arranged on the top of the copper sleeve 61, a first convex block 621 is arranged on the top of the oil seal 62, the first convex block 621 is inserted into the fifth groove 702, a second convex block 622 is arranged on the bottom of the oil seal 62, the second convex block 622 is inserted into the storage oil groove 613 and closes the top thereof, so as to prevent the lubricating oil from leaking. A fourth groove 623 is formed in the bottom of the oil seal 62, the fourth groove 623 is an annular groove, a sealing rubber ring 67 is arranged in the fourth groove 623, the sealing rubber ring 67 is pressed on the upper surface of the second graphite 66. A third groove 618 is formed in the bottom of the copper sleeve 61, a connecting ring 68 is arranged at the bottom of the copper sleeve 61, a first protrusion 681 is arranged on the top of the connecting ring 68, the first protrusion 681 is inserted into the third groove 618, a second protrusion 682 is arranged on the bottom of the connecting ring 68, and the second protrusion 682 is inserted into the first groove 33 of the bush 3.

[0049] As Figure 17 and Figure 18 shown, a swivel base 71 is provided at the lower end of the swivel column 7. The swivel base 71 is snap-fitted into the second card slot 202. A second gasket 17 is provided at the connection between the swivel base 71 and the second card slot 202. The second gasket 17 is sleeved on the swivel column 7. A second connection hole 701 is formed in the middle of the swivel column 7. An internal thread 703 is provided at the upper end of the second connection hole 701. The threaded portion 41 of the valve stem 4 is in threaded connection with the internal thread 703 for transmission. The structure of the swivel column 7 is a stepped shaft. An external thread 72 is provided at the outer edge of the upper end of the swivel column 7. Six stop cut grooves 73 are provided at the outer edge of the stepped portion of the swivel column 7. The top of the stop cut groove 73 is located below the external thread 72. The bottom of the stop cut groove 73 is located above the first through hole 201 of the upper cover 2. A handwheel 10 is sleeved on the swivel column 7. A regular hexagonal hole is formed in the middle of the handwheel 10. The regular hexagonal hole is matched with the six stop cut grooves 73 for limiting. A second nut 15 is threadedly connected to the external thread 72. A first gasket 16 is provided between the top of the handwheel 10 and the bottom of the second nut 15. The first gasket 16 is sleeved on the external thread 72. The handwheel 10 is locked on the swivel column 7 by the second nut 15.

[0050] Specifically, in the embodiment, sealing rings 9 are respectively installed at both ends of the valve core gate 8. When the valve core gate 8 slides downward, the two first inclined surfaces 82 of the valve core gate 8 are respectively close to and fit with the second inclined surfaces 94 of the two sealing rings 9. When the valve core gate 8 slides to the lowermost end, the first inclined surface 82 is completely in fit and pressed with the second inclined surface 94, thereby completely closing the water intercepting groove 106 of the valve body 1 to achieve the closing of the gate valve. When the valve needs to be opened, the handwheel 10 is rotated to drive the rotating column 7 to rotate. The internal thread 703 of the rotating column 7 is in threaded transmission with the threaded portion 41 of the valve rod 4, thereby driving the valve rod 4 to slide upward. The valve core gate 8 slides upward along the water intercepting groove 106 and the first sliding hole 1031, so that the first inclined surface 82 of the valve core gate 8 is separated from the second inclined surfaces 94 of the two sealing rings 9. At this time, the first water passing hole 104 is communicated with the water intercepting groove 106, and the gate valve is opened. The gate valve is opened and the flow rate of the gate valve is adjusted by rotating the handwheel 10 to adjust the positions of the valve rod 4 and the valve core gate 8. The adjustment is convenient and fast. During the up and down sliding process of the valve rod 4, the lubrication mechanism 6 fully lubricates the outer circumferential surface of the valve rod 4. During installation, sufficient lubricating oil is first injected into the oil storage groove 613 of the copper sleeve 61. The first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66 are fixed into the installation groove 611. The oil seal 62 is fixed on the top of the copper sleeve 61, so that the second convex block 622 is inserted into the oil storage groove 613 to seal it. The sealing rubber ring 67 in the fourth groove 623 firmly presses on the top of the second graphite 66. During the use of the gate valve, the valve rod 4 slides relatively at the contact positions with the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66. The lubricating oil flows into the oil seepage groove 616 through the first oil outlet hole 614 and the second oil outlet hole 615. The lubricating oil slowly accumulates in the arc-shaped ring groove 617 until the oil seepage groove 616 is filled up. The bottom of the first oil-impregnated packing 63 contacts the lubricating oil and permeates the lubricating oil to the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66 in sequence. The outer circumferential surface of the valve rod 4 is fully lubricated by the first oil-impregnated packing 63, the second oil-impregnated packing 64, the first graphite 65 and the second graphite 66, reducing the wear on the surface of the valve rod 4 and extending the service life of the valve rod 4.

[0051] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A gate valve with a lubricating function, comprising a valve body (1) and an upper cover (2), the upper cover (2) is arranged on the valve body (1), and is characterized in that: A water intercepting groove (106) is formed in the valve body (1). A first water passing hole (104) is formed in the middle of the side wall of the valve body (1). Sealing rings (9) are clamped at both ends of the water intercepting groove (106). A valve core gate plate (8) is slidably arranged in the water intercepting groove (106). A first through hole (201) is formed in the middle of the upper cover (2). A second sliding hole (203) is formed in the bottom of the upper cover (2). A valve rod (4) is slidably arranged in the second sliding hole (203). The valve rod (4) includes a threaded portion (41) and a connecting head (42). The threaded portion (41) penetrates through the first through hole (201) and extends above the top of the upper cover (2). The connecting head (42) is clamped at the top of the valve core gate plate (8). A packing chamber (5) is inserted into the first through hole (201). A gland (3) is arranged at the top of the packing chamber (5). A first groove (33) is formed in the middle of the top of the gland (3). A lubricating mechanism (6) for lubricating the valve rod (4) is inserted into the first groove (33). A second clamping groove (202) is formed at a position above the upper cover (2). A rotating column (7) is clamped in the second clamping groove (202). A fifth groove (702) is formed in the bottom of the rotating column (7). The top of the lubricating mechanism (6) is inserted into the fifth groove (702). The lubricating mechanism (6) is sleeved on the valve rod (4). A hand wheel (10) is sleeved on the rotating column (7).

2. The gate valve with a lubricating function according to claim 1, wherein: The lubrication mechanism (6) includes a bronze bushing (61). An installation groove (611) is formed at the top of the bronze bushing (61). A third sliding hole (612) is formed at the bottom of the installation groove (611). The valve rod (4) passes through the third sliding hole (612). An oil-impregnated packing (63), a second oil-impregnated packing (64), a first graphite (65), and a second graphite (66) are sequentially arranged in the installation groove (611) from bottom to top. The top of the valve rod (4) sequentially penetrates through the first oil-impregnated packing (63), the second oil-impregnated packing (64), the first graphite (65), and the second graphite (66). The outer circumferential surface of the valve rod (4) is in close contact with the inner walls of the first oil-impregnated packing (63), the second oil-impregnated packing (64), the first graphite (65), and the second graphite (66). An oil seepage groove (616) is formed at the bottom of the installation groove (611). An oil-impregnated ring is formed at the bottom of the first oil-impregnated packing (63). The oil-impregnated ring extends into the oil seepage groove (616) and seals its top. The oil seepage groove (616) is an annular groove. Six second oil outlet holes (615) are evenly formed at the middle position of the bottom of the oil seepage groove (616). The six second oil outlet holes (615) are distributed in an annular array. An oil storage groove (613) is formed at the top of the bronze bushing (61). The oil storage groove (613) is annular. Six first oil outlet holes (614) are evenly formed on the inner wall of the oil storage groove (613). The six first oil outlet holes (614) are distributed in an annular array. The six first oil outlet holes (614) are respectively in one-to-one correspondence and communicate with the six second oil outlet holes (615). An oil seal (62) is arranged at the top of the bronze bushing (61). A connecting ring (68) is arranged at the bottom of the bronze bushing (61).

3. The gate valve with lubricating function according to claim 2, characterized in that: An arc-shaped ring groove (617) is formed at the middle of the bottom of the oil seepage groove (616). The cross-sectional shape of the arc-shaped ring groove (617) is semi-circular. The arc-shaped ring groove (617) communicates with the tops of the six second oil outlet holes (615). A first convex block (621) is arranged at the top of the oil seal (62). The first convex block (621) is inserted into the fifth groove (702). A second convex block (622) is arranged at the bottom of the oil seal (62). The second convex block (622) is inserted into the oil storage groove (613) and seals its top. A fourth groove (623) is formed at the bottom of the oil seal (62). The fourth groove (623) is an annular groove. A sealing rubber ring (67) is arranged in the fourth groove (623). The sealing rubber ring (67) is pressed against the upper surface of the second graphite (66). A third groove (618) is formed at the bottom of the bronze bushing (61). A first protrusion (681) is arranged at the top of the connecting ring (68). The first protrusion (681) is inserted into the third groove (618). A second protrusion (682) is arranged at the bottom of the connecting ring (68). The second protrusion (682) is inserted into the first groove (33) of the pressure sleeve (3).

4. A gate valve with lubricating function according to claim 1, characterized in that: The second sliding hole (203) is located at the lower end of the first through hole (201), and the diameter of the second sliding hole (203) is smaller than that of the first through hole (201). A receiving groove (205) is formed at the bottom of the second sliding hole (203). The structure of the receiving groove (205) is frustum-shaped. The second clamping groove (202) is located at the lower end of the first through hole (201). The top of the rotating column (7) penetrates through the first through hole (201) and extends above the upper cover (2). A rotating seat (71) is arranged at the lower end of the rotating column (7). The rotating seat (71) is clamped in the second clamping groove (202). A second gasket (17) is arranged at the connection between the rotating seat (71) and the second clamping groove (202). The second gasket (17) is sleeved on the rotating column (7). A second connection hole (701) is formed in the middle of the rotating column (7). An internal thread (703) is formed at the upper end of the second connection hole (701). The threaded part (41) of the valve rod (4) is in threaded connection with the internal thread (703) for transmission. The rotating column (7) has a stepped shaft structure. External threads (72) are formed on the outer edge of the upper end of the rotating column (7). Six stop cut grooves (73) are formed on the outer edge of the stepped part of the rotating column (7). The top of the stop cut grooves (73) is located below the external threads (72). The bottom of the stop cut grooves (73) is located above the first through hole (201) of the upper cover (2). A regular hexagonal hole is formed in the middle of the handwheel (10). The regular hexagonal hole cooperates with the six stop cut grooves (73) for positioning. A second nut (15) is in threaded connection with the external threads (72). A first gasket (16) is arranged between the top of the handwheel (10) and the bottom of the second nut (15). The first gasket (16) is sleeved on the external threads (72).

5. The gate valve with a lubricating function according to claim 1, characterized in that: A first connection seat (101) is arranged on one side of the valve body (1), and a second connection seat (102) is arranged on the other side of the valve body (1). The first water passing hole (104) penetrates through the middle parts of the side walls of the first connection seat (101) and the second connection seat (102). The first water passing hole (104) communicates with the water intercepting groove (106). Clamping grooves (105) are formed at the joints of both ends of the water intercepting groove (106) and the first water passing hole (104). The sealing ring (9) includes a clamping ring (91). The clamping ring (91) is clamped in the clamping groove (105).

6. The gate valve with lubricating function according to claim 4, characterized in that: The threaded portion (41) sequentially penetrates through the receiving groove (205), the second sliding hole (203), the first through hole (201), and the second clamping groove (202) and extends above the top of the upper cover (2). A clamping portion (43) is provided on the outer circumferential surface of the connecting head (42). The upper end of the valve core gate plate (8) is slidably disposed in the first sliding hole (1031). A connecting groove (81) is provided at the top of the side wall of the valve core gate plate (8). The shape of the connecting groove (81) is convex. The connecting groove (81) is adapted to the outer shape of the clamping portion (43). First inclined surfaces (82) are provided at the bottoms of both side walls of the valve core gate plate (8). Second chamfers (83) are provided at the bottoms of the front and rear end faces of the valve core gate plate (8). The sealing ring (9) further includes a clamping head (92). A second inclined surface (94) is provided on the side wall of the clamping head (92). The second inclined surface (94) is adapted to the first inclined surface (82) of the valve core gate plate (8). A third chamfer (93) is provided on the side wall of the clamping head (92). A second water passing hole (901) is provided in the middle of the sealing ring (9). The second water passing hole (901) communicates with the first water passing hole (104) and the water intercepting groove (106). A second groove (44) is provided on the outer circumferential surface of the valve stem (4). An O-ring is provided in the second groove (44). The outer edge of the O-ring is in contact with the inner wall of the second sliding hole (203).

7. A gate valve with a lubricating function according to claim 5, characterized in that: The first water passing hole (104) has a stepped hole structure. Four mounting holes (1011) are provided on the side walls of both the first connecting seat (101) and the second connecting seat (102). The four mounting holes (1011) are annularly arranged around the first water passing hole (104). A third connecting seat (103) is provided at the upper end of the middle of the valve body (1). The third connecting seat (103) has a square structure. A first sliding hole (1031) is provided in the middle of the third connecting seat (103). The first sliding hole (1031) communicates with the water intercepting groove (106). A first cutting groove (1034) is provided in the middle of the upper surface of the third connecting seat (103). A sealing ring is provided in the first cutting groove (1034). A first clamping groove (1032) is provided at the bottom of the first cutting groove (1034). A convex ring (204) is provided at the bottom of the upper cover (2). The convex ring (204) is inserted into the first clamping groove (1032), and the convex ring (204) is adapted to the outer shape of the first clamping groove (1032). The bottom of the upper cover (2) presses against the sealing ring to seal the first cutting groove (1034).

8. The gate valve with lubricating function according to claim 7, characterized in that: Threaded connection holes (1033) are provided at the four corners of the upper surface of the third connecting seat (103). Locking holes (208) are provided at the four corners of the bottom of the upper cover (2). The four locking holes (208) are provided opposite to the four threaded connection holes (1033) one by one. A first bolt (11) is provided in the locking hole (208). The thread of the first bolt (11) is screwed into the threaded connection hole (1033).

9. The gate valve with lubricating function according to claim 1, characterized in that: A first insertion hole (31) is formed in the middle of the bush (3), the valve rod (4) passes through the first insertion hole (31), second insertion holes (32) are formed at both ends of the bush (3), a second bolt (12) is inserted into the second insertion hole (32), the bottom structure of the second bolt (12) is a spherical head, a connecting shaft (13) is inserted into the bottom of the second bolt (12), mounting rib plates (206) are arranged at both ends of the middle part of the upper cover (2), a first connection hole (207) is formed in the front of the mounting rib plate (206), both ends of the connecting shaft (13) are inserted into the first connection hole (207), and a first nut (14) is threadedly connected to the top of the second bolt (12).

10. A gate valve with a lubricating function according to claim 1, characterized in that: A through hole (501) is formed in the middle of the stuffing box (5), the valve rod (4) passes through the through hole (501), a snap ring (51) is arranged at the top of the stuffing box (5), a first chamfer (52) is formed at the top of the snap ring (51), a fourth chamfer (34) is formed at the bottom of the bush (3), and the fourth chamfer (34) is adapted to the first chamfer (52) of the stuffing box (5).

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