A gate valve with lubrication function

Abstract

This invention discloses a gate valve with lubrication function, including a valve body and a top cover. The top cover is disposed on the valve body, and a water-cutting groove is formed in the valve body. A first water passage hole is formed in the middle of the side wall of the valve body. Sealing rings are snapped into both ends of the water-cutting groove. A valve core gate plate is slidably disposed in the water-cutting groove. During the up-and-down sliding process of the valve stem, the lubrication mechanism fully lubricates the outer circumferential surface of the valve stem. The valve stem slides relative to the contact points with the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite. The lubricating oil flows into the oil seepage groove through the first oil outlet and the second oil outlet. The bottom of the first oil-immersed packing contacts the lubricating oil, allowing the lubricating oil to penetrate into the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite in sequence. The first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite fully lubricate the outer circumferential surface of the valve stem, reducing wear on the valve stem surface and extending the service life of the valve stem.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a gate valve with lubrication function. Background Technology

[0002] The gate valve's opening and closing element is a gate. The gate's movement direction is perpendicular to the fluid direction. Gate valves can only be fully open or fully closed; they cannot be used for regulation or throttling. The gate 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 depending on the valve parameters.

[0003] Existing gate valves use a threaded connection between the valve stem and a ferrule for threaded transmission, which in turn moves the gate up and down to open and close the passage. As the valve stem rubs against the valve cover during use, the surface of the valve stem wears down, causing the valve stem to lose its function and have 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 lubrication function to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a gate valve with a lubrication function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gate valve with lubrication function, comprising a valve body and a top cover, the top cover being disposed on the valve body, a water-cutting groove being formed in the valve body, a first water passage hole being formed in the middle of the side wall of the valve body, sealing rings being snapped into both ends of the water-cutting groove, a valve core gate plate being slidably disposed in the water-cutting groove, a first through hole being formed in the middle of the top cover, a second sliding hole being formed at the bottom of the top cover, a valve stem being slidably disposed in the second sliding hole, the valve stem comprising a threaded portion and a connector, the threaded portion penetrating the first through hole. The hole extends to the top of the cover. The connector is snapped onto the top of the valve core gate. A packing chamber is inserted into the first through hole. A pressure sleeve is provided on the top of the packing chamber. A first groove is opened in the middle of the top of the pressure sleeve. A lubrication mechanism for lubricating the valve stem is inserted into the first groove. A second slot is opened near the top of the cover. A rotating column is snapped into the second slot. A fifth groove is opened at the bottom of the rotating column. The top of the lubrication mechanism is inserted into the fifth groove. The lubrication mechanism is sleeved on the valve stem. A handwheel is sleeved on the rotating column.

[0007] In a preferred embodiment of the present invention, the lubrication mechanism includes a copper sleeve. A mounting groove is formed at the top of the copper sleeve, and a third sliding hole is formed at the bottom of the mounting groove. The third sliding hole allows a valve stem to pass through. From bottom to top, a first oil-immersed packing, a second oil-immersed packing, a first graphite, and a second graphite are sequentially arranged within the mounting groove. The top of the valve stem passes through the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite in sequence, and the outer circumferential surface of the valve stem is tightly fitted to the inner walls of the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite. An oil seepage groove is formed at the bottom of the mounting groove. An oil-immersed packing has an oil-immersing ring at its bottom, which extends into the oil seepage groove and seals its top. The oil seepage groove is an annular groove. Six second oil outlet holes are evenly distributed in a ring array at the center of the bottom of the oil seepage groove. An oil storage groove is provided at the top of the copper sleeve. The oil storage groove is annular, and six first oil outlet holes are evenly distributed in a ring array on its inner wall. The six first oil outlet holes are connected to the six second oil outlet holes one by one. An oil seal is provided at the top of the copper sleeve, and a connecting ring is provided at the bottom of the copper sleeve.

[0008] As a preferred embodiment of the present invention, an arc-shaped annular groove is provided in the middle of the bottom of the oil seepage groove. The arc-shaped annular groove has a semi-circular cross-section and connects the tops of the six second oil outlet holes. A first protrusion is provided on the top of the oil seal and is inserted into a fifth groove. A second protrusion is provided on the bottom of the oil seal and is inserted into the oil storage groove, sealing its top. A fourth groove is provided on the bottom of the oil seal. The fourth groove is an annular groove and a sealing ring is provided in the fourth groove. The sealing ring is pressed against the upper surface of the second graphite. A third groove is provided on the bottom of the copper sleeve. A first protrusion is provided on the top of the connecting ring and is inserted into the third groove. A second protrusion is provided on the bottom of the connecting ring and is inserted into the first groove of the pressure sleeve.

[0009] In a preferred embodiment 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 the diameter of the first through hole. A receiving groove is formed at the bottom of the second sliding hole, and the receiving groove is frustoconical in shape. The second slot is located at the lower end of the first through hole. The top of the rotating column penetrates the first through hole and extends above the upper cover. A rotating seat is provided at the lower end of the rotating column, and the rotating seat is engaged in the second slot. A second gasket is provided at the connection between the rotating seat and the second slot, and the second gasket is sleeved on the rotating column. A second connecting hole is formed in the middle of the rotating column, and the upper end of the second connecting hole is... The valve stem is provided with an internal thread, and the threaded part of the valve stem is connected to the internal thread for transmission. The rotating column structure is a stepped shaft, and the outer edge of the upper end of the rotating column is provided with an external thread. The outer edge of the stepped part of the rotating column is provided with six stop grooves. The top of the stop groove is located below the external thread, and the bottom of the stop groove is located above the first through hole of the upper cover. The handwheel is provided with a regular hexagonal hole in the middle, and the regular hexagonal hole cooperates with the six stop grooves for limiting the movement. A second nut is threaded onto the external thread, and a first washer is provided between the top of the handwheel and the bottom of the second nut. The first washer is sleeved on the external thread.

[0010] As a preferred embodiment of the present invention, a first connecting seat is provided on one side of the valve body, and a second connecting seat is provided on the other side of the valve body. The first water passage hole penetrates the middle of the side wall of the first connecting seat and the second connecting seat. The first water passage hole is connected to the water interception groove. The two ends of the water interception groove are provided with engagement grooves at the connection points with the first water passage hole. The sealing ring includes a snap-fit ​​ring, which is snapped into the engagement groove.

[0011] As a preferred embodiment of the present invention, the threaded portion sequentially passes through the receiving groove, the second sliding hole, the first through hole, and the second locking groove, extending to the top of the upper cover. The outer circumferential surface of the connector has a locking portion. The upper end of the valve core gate plate is slidably disposed in the first sliding hole. The top of the side wall of the valve core gate plate has a connecting groove. The connecting groove is convex in shape and is adapted to the shape of the locking portion. The bottom of both side walls of the valve core gate plate has a first inclined surface. The bottom of the front and rear end faces of the valve core gate plate has a second chamfer. The sealing ring also includes a locking connector. The side wall of the locking connector has a second inclined surface, which is adapted to the first inclined surface of the valve core gate plate. The side wall of the locking connector has a third chamfer. The middle of the sealing ring has a second water passage hole, which is interconnected with the first water passage hole and the water interception groove. The outer circumferential surface of the valve stem has a second groove. An O-ring is disposed in the second groove, and the outer edge of the O-ring is fitted to the inner wall of the second sliding hole.

[0012] As a preferred embodiment of the present invention, the first water passage hole is a stepped hole, and the side walls of the first and second connecting seats are each provided with four mounting holes. The four mounting holes are arranged in a circular array with the first water passage hole as the center. A third connecting seat is provided at the upper middle part of the valve body. The third connecting seat is square in structure. A first sliding hole is provided in the middle of the third connecting seat. The first sliding hole communicates with the water interception groove. A first groove is provided in the middle of the upper surface of the third connecting seat. A sealing ring is provided in the first groove. A first slot is provided at the bottom of the first groove. A convex ring is provided at the bottom of the upper cover. The convex ring is inserted into the first slot, and the convex ring is adapted to the shape of the first slot. The bottom of the upper cover is pressed against the sealing ring to seal the first groove.

[0013] As a preferred embodiment 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 and the four threaded connection holes are aligned one to one. A first bolt is provided in the locking hole, and the thread of the first bolt is screwed into the threaded connection hole.

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

[0015] As a preferred embodiment of the present invention, a through hole is provided in the middle of the packing chamber, the valve stem passes through the through hole, a retaining ring is provided at the top of the packing chamber, a first chamfer is provided at the top of the retaining ring, and a fourth chamfer is provided at the bottom of the pressure sleeve, the fourth chamfer being adapted to the first chamfer of the packing chamber.

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

[0017] 1. The present invention provides a gate valve with lubrication function. This invention involves installing sealing rings at both ends of the valve core gate. When the valve core gate slides downwards, the two first inclined surfaces of the valve core gate approach and fit against the second inclined surfaces of the two sealing rings. When the valve core gate slides to its lowest point, the first and second inclined surfaces are completely pressed together, thus completely sealing the water-stopping groove of the valve body and closing the gate valve. To open the valve, the handwheel is turned to rotate the rotating column. The internal thread of the rotating column engages with the threaded part of the valve stem, causing the valve stem to slide upwards. The valve core gate slides upwards along the water-stopping groove and the first sliding hole, causing the first inclined surface of the valve core gate to disengage from the second inclined surfaces of the two sealing rings. At this time, the first water passage hole connects with the water-stopping groove, and the gate valve opens. The position of the valve stem and the valve core gate is adjusted by rotating the handwheel to open the gate valve and regulate the flow rate, making adjustment convenient and quick.

[0018] 2. The gate valve with lubrication function described in this invention provides sufficient lubrication to the outer circumferential surface of the valve stem during the up-and-down sliding process. During the use of the gate valve, the valve stem slides relative to the contact points of the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite. Lubricating oil flows into the oil seepage groove through the first oil outlet and the second oil outlet. The lubricating oil slowly accumulates in the arc-shaped annular groove until it is full. The bottom of the first oil-immersed packing contacts the lubricating oil, allowing the lubricating oil to penetrate sequentially into the first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite. The first oil-immersed packing, the second oil-immersed packing, the first graphite, and the second graphite provide sufficient lubrication to the outer circumferential surface of the valve stem, reducing wear on the valve stem surface and extending the service life of the valve stem. Attached Figure Description

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

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

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

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

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

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

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

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

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

[0028] Figure 9 This is a three-dimensional schematic diagram of the pressure sleeve structure of the present invention;

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

[0030] Figure 11 This is a three-dimensional schematic diagram of the packing bin structure of the present invention;

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

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

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

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

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

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

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

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

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

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

[0041] In the diagram: 1. Valve body; 101. First connecting seat; 1011. Mounting hole; 102. Second connecting seat; 103. Third connecting seat; 1031. First sliding hole; 1032. First retaining groove; 1033. Threaded connection hole; 1034. First notch; 104. First water passage hole; 105. Engaging groove; 106. Water interception groove; 2. Top cover; 201. First through hole; 202. Second retaining groove; 203. Second sliding hole; 204. Protruding ring; 205. Receiving groove; 206. Mounting stiffener; 207, First connecting hole; 208, Locking hole; 3, Pressure sleeve; 31, First insertion hole; 32, Second insertion hole; 33, First groove; 34, Fourth chamfer; 4, Valve stem; 41, Threaded part; 42, Connector; 43, Snap-fit ​​part; 44, Second groove; 5, Packing chamber; 501, Through hole; 51, Snap ring; 52, First chamfer; 6, Lubrication mechanism; 61, Copper sleeve; 611, Mounting groove; 612, Third sliding hole; 613, Oil reservoir; 614, First outlet 615. Oil outlet; 616. Oil seepage groove; 617. Arc-shaped annular groove; 618. Third groove; 62. Oil seal; 621. First protrusion; 622. Second protrusion; 623. Fourth groove; 63. First oil-immersed packing; 64. Second oil-immersed packing; 65. First graphite; 66. Second graphite; 67. Sealing ring; 68. Connecting ring; 681. First protrusion; 682. Second protrusion; 7. Rotary column; 701. Second connecting hole; 702. Fifth groove; 703. Internal thread; 71. Rotary seat; 72. External thread; 73. Stop groove; 8. Valve core gate; 81. Connecting groove; 82. First bevel; 83. Second chamfer; 9. Sealing ring; 901. Second water passage hole; 91. Snap-fit ​​ring; 92. Snap-fit ​​connector; 93. Third chamfer; 94. Second bevel; 10. Handwheel; 11. First bolt; 12. Second bolt; 13. Connecting shaft; 14. First nut; 15. Second nut; 16. First washer; 17. Second washer. Detailed Implementation

[0042] Embodiments of the present invention will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0043] Furthermore, the terms used below are defined based on the functionality of this invention and may vary depending on the user's, operator's, or conventions. Therefore, these terms are defined based on the entire contents of this specification.

[0044] like Figures 1 to 21As shown, a gate valve with lubrication function includes a valve body 1 and a top cover 2. The top cover 2 is disposed on the valve body 1. A first connecting seat 101 is disposed on one side of the valve body 1, and a second connecting seat 102 is disposed on the other side of the valve body 1. A third connecting seat 103 is disposed at the upper middle part of the valve body 1. A water-cutting groove 106 is formed inside the valve body 1. A first water passage hole 104 is formed in the middle of the side wall of the first connecting seat 101 and the second connecting seat 102. The first water passage hole 104 has a stepped hole structure and communicates with the water-cutting groove 106. A locking groove 105 is formed at the connection between the water-cutting groove 106 and the two first water passage holes 104. A sealing ring 9 is locked in the locking groove 105. A valve core gate plate 8 is slidably disposed in the water-cutting 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. A first connecting seat 101 and the second connecting seat 102 have a water-cutting groove 106 in the middle of the valve body 106. Four mounting holes 1011 are arranged in a circular array around the first water passage hole 104. The third connecting seat 103 has a first sliding hole 1031 in the middle, which communicates with the water interception groove 106. The third connecting seat 103 has a square structure. Threaded connecting holes 1033 are provided at the four corners of the upper surface of the third connecting seat 103. A first 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 groove 1034 to prevent water leakage from the connection between the upper cover 2 and the third connecting seat 103, providing a good sealing effect. A first slot 1032 is provided at the bottom of the first groove 1034. A protruding ring 204 is provided at the bottom of the upper cover 2. The protruding ring 204 is inserted into the first slot 1032, and the protruding ring 204 and the first slot 1032 are adapted in shape. The bottom of the upper cover 2 is pressed against the sealing ring to seal the first groove 1034.

[0045] like Figures 5 to 8 As shown, the upper cover 2 has a first through hole 201 in the middle and a second sliding hole 203 at the bottom. 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 the diameter of the first through hole 201. The bottom of the second sliding hole 203 has a receiving groove 205, which is frustoconical in shape. The four corners of the bottom of the upper cover 2 have locking holes 208. The four locking holes 208 are directly opposite to the four threaded connection holes 1033. A first bolt 11 is installed 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 to the top of the valve body 1. A second slot 202 is provided at the upper position of the upper cover 2. The second slot 202 is located at the lower end of the first through hole 201. A rotating post 7 is engaged in the second slot 202. The top of the rotating post 7 passes through the first through hole 201 and extends to the top of the upper cover 2.

[0046] like Figure 10 and Figure 19 As shown, a valve stem 4 is slidably disposed within the second sliding hole 203. The valve stem 4 includes a threaded portion 41 and a connector 42. The threaded portion 41 sequentially passes through the receiving groove 205, the second sliding hole 203, the first through hole 201, and the second retaining groove 202, extending to the top of the upper cover 2. The top of the valve stem 4 passes through the rotating column 7 and is threadedly connected to it. A retaining portion 43 is provided on the outer circumferential surface of the connector 42. The upper end of the valve core gate plate 8 is slidably disposed within the first sliding hole 1031. A connecting groove 81 is provided on the top of the side wall of the valve core gate plate 8. The connecting groove 81 is convex in shape and is adapted to the shape of the retaining portion 43. The valve core gate plate 8 and the valve stem 4 are connected by the cooperation of the connecting groove 81 and the retaining portion 43. Both sides of the valve core gate plate 8 have openings at the bottom. The valve core gate plate 8 has a first inclined surface 82. The bottom of the front and rear end faces of the valve core gate plate 8 are both provided with a second chamfer 83. The sealing ring 9 includes a snap-fit ​​ring 91 and a snap-fit ​​connector 92. The snap-fit ​​ring 91 is snapped into the snap-fit ​​groove 105. The side wall of the snap-fit ​​connector 92 is provided with a second inclined surface 94. The second inclined surface 94 is adapted to the first inclined surface 82 of the valve core gate plate 8. The side wall of the snap-fit ​​connector 92 is provided with a third chamfer 93. The sealing ring 9 has a second water passage hole 901 in the middle. The second water passage hole 901 is interconnected with the first water passage hole 104 and the water interception groove 106. The valve stem 4 has a second groove 44 on its outer circumference. An O-ring is provided in the second groove 44. The outer edge of the O-ring is fitted with the inner wall of the second sliding hole 203 to seal and prevent leakage.

[0047] like Figure 4 , Figure 9 and Figure 11 As 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, through which the valve stem 4 passes. A retaining ring 51 is provided at the top of the packing chamber 5, and a first chamfer 52 is formed at the top of the retaining ring 51. A pressure sleeve 3 is provided at the top of the packing chamber 5, and a first insertion hole 31 is formed in the middle of the pressure sleeve 3 for the valve stem 4 to pass through. Second insertion holes 32 are formed at both ends of the pressure sleeve 3, and second bolts 12 are inserted into the second insertion holes 32. The bottom structure of the second bolts 12 is a spherical head. A connecting shaft 13 is inserted into the bottom of the bolt 12. Both ends of the upper cover 2 are provided with mounting ribs 206. The front of the mounting ribs 206 is provided with a first connecting hole 207. Both ends of the connecting shaft 13 are inserted into the first connecting hole 207. The top of the second bolt 12 is threaded with a first nut 14. The pressure sleeve 3 is locked onto the upper cover 2 by the cooperation of the second bolt 12 and the first nut 14. The bottom of the pressure sleeve 3 is provided with a fourth chamfer 34. The fourth chamfer 34 cooperates with the first chamfer 52 of the packing chamber 5, thereby fixing and pressing the packing chamber 5 into the first through hole 201.

[0048] like Figures 12 to 16 As shown, the pressure sleeve 3 has a first groove 33 in the middle of its top, and a lubrication mechanism 6 is inserted into the first groove 33. The rotating column 7 has a fifth groove 702 at its bottom, and the top of the lubrication mechanism 6 is inserted into the fifth groove 702. The lubrication mechanism 6 includes a copper sleeve 61, the top of which has an installation groove 611, and the bottom of which has a third sliding hole 612 for the valve stem 4 to pass through. The installation groove 611 has a first oil-impregnated packing 63, a second oil-impregnated packing 64, a first graphite 65, and a second graphite 66 arranged sequentially from bottom to top. The top of the valve stem 4 passes through 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 stem 4 is tightly fitted to the inner walls of the first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66. The first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66 lubricate the valve stem 4, preventing corrosion, rust, and severe wear after a period of use, thus providing good lubrication. An oil seepage groove 616 is provided at the bottom of the mounting groove 611, and an oil-immersing ring is provided at the bottom of the first oil-immersed packing 63. The oil-immersing ring extends into the oil seepage groove 616 and seals its top, reducing oil overflow. The oil seepage groove 616 is an annular groove, and six second oil outlet holes 615 are evenly distributed at the center of the bottom of the oil seepage groove 616, arranged in a circular array. The oil seepage groove 616 has an arc-shaped annular groove 617 at the bottom center. The arc-shaped annular groove 617 has a semi-circular cross-section and connects the tops of the six second oil outlet holes 615. The top of the copper sleeve 61 has an oil storage groove 613, which is annular. The inner wall of the oil storage groove 613 has six first oil outlet holes 614 evenly distributed in a ring array. The six first oil outlet holes 614 are respectively connected to the six second oil outlet holes 615 one by one. The top of the copper sleeve 61 is provided with an oil seal 62. The top of the oil seal 62 is provided with a first protrusion 621, which is inserted into the fifth groove 702. The bottom of the oil seal 62... A second protrusion 622 is provided, which is inserted into the oil reservoir 613 and its top is sealed to prevent lubricating oil leakage. A fourth groove 623 is provided at the bottom of the oil seal 62. The fourth groove 623 is an annular groove. A sealing ring 67 is provided in the fourth groove 623 and is pressed against the upper surface of the second graphite 66. A third groove 618 is provided at the bottom of the copper sleeve 61. A connecting ring 68 is provided at the bottom of the copper sleeve 61. A first protrusion 681 is provided at the top of the connecting ring 68 and is inserted into the third groove 618. A second protrusion 682 is provided at the bottom of the connecting ring 68 and is inserted into the first groove 33 of the pressure sleeve 3.

[0049] like Figure 17 and Figure 18 As shown, a rotating base 71 is provided at the lower end of the rotating column 7. The rotating base 71 is engaged in the second slot 202. A second gasket 17 is provided at the connection between the rotating base 71 and the second slot 202. The second gasket 17 is sleeved on the rotating column 7. A second connecting hole 701 is provided in the middle of the rotating column 7. An internal thread 703 is provided at the upper end of the second connecting hole 701. The threaded part 41 of the valve stem 4 is threadedly connected to the internal thread 703 for transmission. The rotating column 7 has a stepped shaft structure. An external thread 72 is provided on the outer edge of the upper end of the rotating column 7. Six stop holes are provided on the outer edge of the stepped part of the rotating column 7. The moving groove 73 has its top located below the external thread 72 and its bottom located above the first through hole 201 of the upper cover 2. A handwheel 10 is fitted on the rotating column 7. A regular hexagonal hole is opened in the middle of the handwheel 10. The regular hexagonal hole cooperates with the six stopping grooves 73 to limit the movement. A second nut 15 is threaded onto the external thread 72. A first washer 16 is provided between the top of the handwheel 10 and the bottom of the second nut 15. The first washer 16 is fitted onto the external thread 72, and the handwheel 10 is locked onto the rotating column 7 by the second nut 15.

[0050] Specifically, by installing sealing rings 9 at both ends of the valve core gate plate 8, when the valve core gate plate 8 slides downward, the two first inclined surfaces 82 of the valve core gate plate 8 approach and fit against the second inclined surfaces 94 of the two sealing rings 9. When the valve core gate plate 8 slides to the lowest point, the first inclined surfaces 82 and the second inclined surfaces 94 are completely fitted and pressed together, thereby completely sealing the water-stopping groove 106 of the valve body 1, thus closing the gate valve. When it is necessary to open the valve, the handwheel 10 is turned to drive the rotating column 7 to rotate. The internal thread 703 of the rotating column 7 engages with the threaded part 41 of the valve stem 4 for threaded transmission. This causes the valve stem 4 to slide upwards, and the valve core gate 8 slides upwards along the water-cutting groove 106 and the first sliding hole 1031, causing the first inclined surface 82 of the valve core gate 8 to disengage from the second inclined surface 94 of the two sealing rings 9. At this time, the first water passage hole 104 is connected to the water-cutting groove 106, and the gate valve opens. The gate valve is opened and the flow rate is adjusted by turning the handwheel 10 to adjust the position of the valve stem 4 and the valve core gate 8. The adjustment is convenient and quick. During the up and down sliding of the valve stem 4, the lubrication mechanism 6 fully lubricates the outer circumference of the valve stem 4. During installation, the oil reservoir of the copper sleeve 61 is first filled with oil. Sufficient lubricating oil is injected into groove 613. The first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66 are fixed into the mounting groove 611. The oil seal 62 is fixed to the top of the copper sleeve 61, so that the second protrusion 622 is inserted into the oil reservoir 613 to seal it. The sealing ring 67 in the fourth groove 623 is firmly pressed against the top of the second graphite 66. During the use of the gate valve, the valve stem 4 slides relative to the contact points of the first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66, and the lubricating oil flows through... The first oil outlet 614 and the second oil outlet 615 flow into the oil seepage groove 616. The lubricating oil slowly accumulates in the arc-shaped annular groove 617 until the oil seepage groove 616 is full. The bottom of the first oil-immersed packing 63 contacts the lubricating oil, allowing the lubricating oil to penetrate sequentially into the first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66. The first oil-immersed packing 63, the second oil-immersed packing 64, the first graphite 65, and the second graphite 66 provide sufficient lubrication to the outer circumferential surface of the valve stem 4, reducing wear on the surface of the valve stem 4 and extending the service life of the valve stem 4.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 lubrication function, comprising a valve body (1) and a top cover (2), wherein the top cover (2) is disposed on the valve body (1), characterized in that: The valve body (1) has a water interception groove (106) inside, and a first water passage hole (104) is provided in the middle of the side wall of the valve body (1). Both ends of the water interception groove (106) are fitted with sealing rings (9). A valve core gate plate (8) is slidably arranged in the water interception groove (106). A first through hole (201) is provided in the middle of the upper cover (2). A second sliding hole (203) is provided at the bottom of the upper cover (2). A valve stem (4) is slidably arranged in the second sliding hole (203). The valve stem (4) includes a threaded part (41) and a connector (42). The threaded part (41) passes through the first through hole (201) and extends to the top of the upper cover (2). The connector (42) is fitted with the valve core gate plate. (8) At the top, a packing chamber (5) is inserted into the first through hole (201). A pressure sleeve (3) is provided at the top of the packing chamber (5). A first groove (33) is opened in the middle of the top of the pressure sleeve (3). A lubrication mechanism (6) for lubricating the valve stem (4) is inserted into the first groove (33). A second slot (202) is opened at the upper position of the upper cover (2). A rotating column (7) is locked in the second slot (202). A fifth groove (702) is opened at the bottom of the rotating column (7). The top of the lubrication mechanism (6) is inserted into the fifth groove (702). The lubrication mechanism (6) is sleeved on the valve stem (4). A handwheel (10) is sleeved on the rotating column (7). The lubrication mechanism (6) includes a copper sleeve (61), the top of which has an installation groove (611), and the bottom of which has a third sliding hole (612) for the valve stem (4) to pass through. The installation groove (611) contains, from bottom to top, a first oil-immersed packing (63), a second oil-immersed packing (64), a first graphite (65), and a second graphite (66). The top of the valve stem (4) passes through the first oil-immersed packing (63), the second oil-immersed packing (64), the first graphite (65), and the second graphite (66). The outer circumference of the valve stem (4) is tightly fitted to the inner walls of the first oil-immersed packing (63), the second oil-immersed packing (64), the first graphite (65), and the second graphite (66). The bottom of the installation groove (611) has an oil seepage groove (616). The bottom of the first oil-immersed packing (63) is provided with an oil-immersed ring, which extends into the oil-seeping groove (616) and seals its top. The oil-seeping groove (616) is an annular groove. Six second oil outlet holes (615) are evenly provided at the middle of the bottom of the oil-seeping groove (616). The six second oil outlet holes (615) are arranged in a ring array. The top of the copper sleeve (61) is provided with an oil storage groove (613). The oil storage groove (613) is annular. The inner wall of the oil storage groove (613) is evenly provided with six first oil outlet holes (614). The six first oil outlet holes (614) are arranged in a ring array. The six first oil outlet holes (614) are respectively connected to the six second oil outlet holes (615) one by one. The top of the copper sleeve (61) is provided with an oil seal (62). The bottom of the copper sleeve (61) is provided with a connecting ring (68). The oil seepage groove (616) has an arc-shaped annular groove (617) in the middle of its bottom. The arc-shaped annular groove (617) has a semi-circular cross-section and connects the tops of the six second oil outlet holes (615). The top of the oil seal (62) is provided with a first protrusion (621), which is inserted into the fifth groove (702). The bottom of the oil seal (62) is provided with a second protrusion (622), which is inserted into the oil storage groove (613) and closes its top. The bottom of the oil seal (62) has a fourth groove (615). 623), the fourth groove (623) is an annular groove, a sealing ring (67) is provided in the fourth groove (623), the sealing ring (67) is pressed against the upper surface of the second graphite (66), a third groove (618) is provided at the bottom of the copper sleeve (61), a first protrusion (681) is provided at the top of the connecting ring (68), the first protrusion (681) is inserted into the third groove (618), a second protrusion (682) is provided at the bottom of the connecting ring (68), the second protrusion (682) is inserted into the first groove (33) of the pressure sleeve (3).

2. A gate valve with lubrication 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 the diameter of the first through hole (201). A receiving groove (205) is provided at the bottom of the second sliding hole (203). The receiving groove (205) is truncated cone-shaped. The second slot (202) is located at the lower end of the first through hole (201). The top of the rotating column (7) passes through the first through hole (201) and extends to the top of the cover (2). A rotating seat (71) is provided at the lower end of the rotating column (7). The rotating seat (71) is engaged in the second slot (202). A second gasket (17) is provided at the connection between the rotating seat (71) and the second slot (202). The second gasket (17) is sleeved on the rotating column (7). A second connecting hole (701) is provided in the middle of the rotating column (7). The upper end of the second connecting hole (701) is open. The valve stem (4) is provided with an internal thread (703). The threaded part (41) of the valve stem (4) is connected to the internal thread (703) for transmission. The rotating column (7) is a stepped shaft. The upper outer edge of the rotating column (7) is provided with an external thread (72). The outer edge of the stepped part of the rotating column (7) is provided with six stop grooves (73). The top of the stop groove (73) is located below the external thread (72). The bottom of the stop groove (73) is located above the first through hole (201) of the upper cover (2). The handwheel (10) is provided with a regular hexagonal hole in the middle. The regular hexagonal hole cooperates with the six stop grooves (73) for limiting. The external thread (72) is threaded with a second nut (15). A first washer (16) is provided between the top of the handwheel (10) and the bottom of the second nut (15). The first washer (16) is sleeved on the external thread (72).

3. A gate valve with lubrication function according to claim 1, characterized in that: A first connecting seat (101) is provided on one side of the valve body (1), and a second connecting seat (102) is provided on the other side of the valve body (1). The first water passage hole (104) passes through the middle of the side wall of the first connecting seat (101) and the second connecting seat (102). The first water passage hole (104) is connected to the water interception groove (106). The two ends of the water interception groove (106) are provided with locking grooves (105) at the connection points with the first water passage hole (104). The sealing ring (9) includes a locking ring (91), which is locked in the locking groove (105).

4. A gate valve with lubrication function according to claim 2, characterized in that: The threaded portion (41) passes through the receiving groove (205), the second sliding hole (203), the first through hole (201), and the second slot (202) in sequence and extends to the top of the cover (2). The connector (42) has a snap-fit ​​portion (43) on its outer circumferential surface. The upper end of the valve core gate (8) is slidably disposed in the first sliding hole (1031). The valve core gate (8) has a connecting groove (81) on the top of its side wall. The connecting groove (81) is convex in shape and is adapted to the shape of the snap-fit ​​portion (43). The bottom of both sides of the valve core gate (8) has a first inclined surface (82). The bottom of the front and rear ends of the valve core gate (8) has a second chamfer. (83) The sealing ring (9) also includes a snap-fit ​​connector (92). The snap-fit ​​connector (92) has a second inclined surface (94) on its side wall. The second inclined surface (94) is adapted to the first inclined surface (82) of the valve core gate (8). The snap-fit ​​connector (92) has a third chamfer (93) on its side wall. The sealing ring (9) has a second water passage hole (901) in the middle. The second water passage hole (901) is connected to the first water passage hole (104) and the water intercepting groove (106). The valve stem (4) has a second groove (44) on its outer circumference. 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).

5. A gate valve with lubrication function according to claim 3, characterized in that: The first water passage (104) has a stepped hole structure. The first connecting seat (101) and the second connecting seat (102) each have four mounting holes (1011) on their side walls. These four mounting holes (1011) are arranged in a circular array around the first water passage (104). A third connecting seat (103) is provided at the upper middle part 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) connects to the water intercepting groove (…). 106) Connect, the third connecting seat (103) has a first groove (1034) in the middle of the upper surface, a sealing ring is provided in the first groove (1034), a first slot (1032) is provided at the bottom of the first 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 slot (1032), and the convex ring (204) is adapted to the shape of the first slot (1032). The bottom of the upper cover (2) is pressed on the sealing ring to seal the first groove (1034).

6. A gate valve with lubrication function according to claim 5, characterized in that: The third connecting seat (103) has threaded connection holes (1033) at all four corners of its upper surface, and the top cover (2) has locking holes (208) at all four corners of its bottom. The four locking holes (208) and the four threaded connection holes (1033) are opened opposite each other. A first bolt (11) is provided in the locking hole (208), and the thread of the first bolt (11) is screwed into the threaded connection hole (1033).

7. A gate valve with lubrication function according to claim 1, characterized in that: The pressure sleeve (3) has a first insertion hole (31) in the middle, through which the valve stem (4) passes. The pressure sleeve (3) has a second insertion hole (32) at both ends. 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). The upper cover (2) has mounting ribs (206) at both ends in the middle. A first connecting hole (207) is opened on the front of the mounting rib (206). Both ends of the connecting shaft (13) are inserted into the first connecting hole (207). A first nut (14) is threaded onto the top of the second bolt (12).

8. A gate valve with lubrication function according to claim 1, characterized in that: The packing chamber (5) has a through hole (501) in the middle, through which the valve stem (4) passes. A retaining ring (51) is provided at the top of the packing chamber (5), and a first chamfer (52) is provided at the top of the retaining ring (51). A fourth chamfer (34) is provided at the bottom of the pressure sleeve (3), and the fourth chamfer (34) is adapted to the first chamfer (52) of the packing chamber (5).

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