gate

Abstract

The present invention provides a gate valve, which comprises: a valve body, a valve plate, a valve stem and a locking device; a valve cavity is arranged inside the valve body, and the valve cavity is respectively formed with an inlet and an outlet at two ends of the valve body; a telescopic hole is arranged on the side wall of the valve body, and the valve plate extends into the valve cavity through the telescopic hole; a slot is arranged on the inner wall of the valve cavity, and the valve plate is inserted into the slot; a guide rail is arranged at the bottom of the slot, and a guide groove matching the guide rail is arranged on the valve plate; a slide groove is arranged on the valve plate, and a slider is arranged on the valve stem, and the slider is slid in the slide groove; a locking device is arranged on the valve plate, and is used to prevent the slider from moving to the outside of the slide groove; when the guide rail is corroded by crude oil and falls off, the valve plate shakes in the slot, and the locking device can prevent the slider from moving to the outside of the slide groove, thereby preventing the slider from separating from the slide groove, so as to prevent the valve plate from separating from the valve stem.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid conveying equipment, and in particular to a gate valve. Background Art

[0002] In the process of oil or natural gas (referred to as oil and gas) extraction, crude oil and gas in oil and gas wells are often transported to storage devices or joint stations through pipelines; therefore, how to control the on-and-off of pipelines to ensure the safe operation of the process has become the key to research.

[0003] In the prior art, a gate valve is often provided on a pipeline to control the on-off of the pipeline through the gate valve. Figure 1 This is a schematic diagram of the structure of a gate valve in the prior art. Please refer to Figure 1 The gate valve includes: a valve plate 20, a valve body 10, a valve cover 70 and a valve stem 30. A valve cavity is provided in the valve body 10. The two ends of the valve cavity extend to the two ends of the valve body 10 respectively and form an inlet and an outlet at the two ends of the valve body 10. A connecting part is provided on the side wall of the valve body 10. A telescopic hole is opened on the connecting part. The valve plate 20 extends into the valve cavity through the telescopic hole. The valve cover 70 is covered on the upper part of the connecting part. A slider 301 is provided at the bottom end of the valve stem 30. A slider 301 is opened on the valve plate 20. There is a slide groove matched with the slider 301, and the slider 301 is stuck in the slide groove; a driving wheel 80 is arranged at the top of the valve stem 30, and a driving external thread is arranged on the side wall of the valve stem 30 near the top, and a driving threaded hole is arranged on the driving wheel 80, and the bottom end of the driving wheel 80 abuts against the valve cover 70; by rotating the driving wheel 80, the valve stem 30 and the valve plate 20 are driven to move up and down, so as to achieve the connection or cutoff of the inlet and the outlet, and then realize the opening or closing of the gate valve. A slot is arranged on the side wall of the valve cavity, and a guide rail 101 is arranged on one side of the slot. A guide groove matched with the guide rail 101 is arranged on the valve plate 20, and the guide rail 101 is slidably arranged in the guide groove to prevent the valve plate 20 from moving toward the side wall in the valve cavity, and when closing the valve, the valve plate 20 and the telescopic hole form a seal in the valve cavity to prevent the crude oil gas from flowing through the gap between the guide rail 101 and the slot.

[0004] However, impurities in the oil and gas are corrosive to a certain extent. After the gate valve has been used for a period of time, the impurities in the oil and gas will corrode part of the guide rail 101, causing the valve plate 20 to move in the slot. During the opening and closing process of the gate valve, the movement of the valve plate 20 can easily cause the slider 301 to slide out of the slide groove, thereby causing the valve stem 30 to separate from the valve plate 20. Summary of the invention

[0005] In view of this, the present invention provides a gate valve to solve the technical problem that after a period of use, impurities in the oil and gas will corrode part of the guide rail, causing the valve plate to move in the slot, and the movement of the valve plate will easily cause the slider to slide out of the slide groove, thereby causing the valve stem to separate from the valve plate.

[0006] The present invention provides a gate valve, comprising: a valve body, a valve plate, a valve stem and a locking device; a valve cavity is arranged inside the valve body, and an inlet and an outlet are formed at two ends of the valve body respectively; a telescopic hole is arranged on the side wall of the valve body, and the valve plate extends into the valve cavity through the telescopic hole; a slot is arranged on the inner wall of the valve cavity, and the valve plate is inserted into the slot; a guide rail is arranged at the bottom of the slot, and a guide groove cooperating with the guide rail is arranged on the valve plate; a sliding groove is arranged on the valve plate, and a slider is arranged on the valve stem, and the slider is slid in the sliding groove; the locking device is arranged on the valve plate, and is used to prevent the slider from moving to the outside of the sliding groove.

[0007] For the gate valve as described above, preferably, the locking device comprises a locking column, a first locking hole is provided on the valve plate, a second locking hole is provided on the slider, and the locking column is inserted into the first locking hole and the second locking hole.

[0008] As for the gate valve as described above, preferably, a first internal thread is provided on the inner wall of the first locking hole, and a first external thread matching with the first internal thread is provided on the locking column.

[0009] As for the gate valve as described above, preferably, a second internal thread is provided on the inner wall of the second locking hole, and a second external thread matching with the second internal thread is provided on the locking column.

[0010] For the gate valve as described above, preferably, there are multiple locking columns, multiple first locking holes are provided on the valve plate, and multiple second locking holes are provided on the slider; each locking column is inserted into one of the first locking holes and one of the second locking holes.

[0011] As for the gate valve as described above, preferably, the locking device includes a stop column and a locking spring, a sliding hole is provided on the sliding block, the stop column is inserted into the sliding hole, and the two ends of the locking spring are respectively connected to the stop column and the bottom of the sliding hole; a groove is provided on the side wall of the slide groove; the locking spring is used to resist the stop column to drive the stop column to extend into the groove.

[0012] As for the gate valve as described above, preferably, the stop column and the locking spring are both multiple, and each of the locking spring and the stop column is inserted into one of the sliding holes.

[0013] As described above, the gate valve preferably further comprises a valve cover and a driving device, wherein the valve cover is arranged on the outside of the telescopic hole, an axial hole is arranged on the valve cover, the valve stem is inserted into the axial hole, and the top end of the valve stem is drivingly connected to the driving device.

[0014] For the gate valve as described above, preferably, the driving device comprises a driving wheel, the driving wheel is coaxially arranged with the valve stem, a driving threaded hole is arranged on the driving wheel, a driving external thread matching with the driving threaded hole is arranged on the valve stem, and the driving wheel is rotatably connected to the valve cover.

[0015] As for the gate valve as described above, preferably, a sealing ring is provided between the valve cover and the valve body.

[0016] The present invention provides a gate valve, which is provided with a valve cavity inside a valve body, and the valve cavity forms an inlet and an outlet at two ends of the valve body respectively; a telescopic hole is opened on the side wall of the valve body, and a valve plate extends into the valve cavity through the telescopic hole; a slot is provided on the side wall of the valve cavity, and the valve plate is inserted into the slot; a guide rail is provided on the bottom of the slot, and a guide groove matching the guide rail is provided on the valve plate, a slide groove is provided on the valve plate, a slider is provided on the valve stem, the slider is slid in the slide groove, and a locking device is provided on the valve plate; when the guide rail is corroded by impurities in oil and gas and falls off, the valve plate shakes in the slot, and the locking device can prevent the slider from moving to the outside of the slide groove, thereby avoiding the slider from being separated from the slide groove, so as to avoid the valve plate from being separated from the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of a gate valve in the prior art;

[0019] Figure 2 This is a schematic diagram of the structure of a gate valve in one embodiment of the present invention;

[0020] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0021] Figure 4 It is a structural schematic diagram of a gate valve in another embodiment of the present invention;

[0022] Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0023] Description of reference numerals:

[0024] 10. Valve body;

[0025] 101, guide rail;

[0026] 20. Valve plate;

[0027] 201, chute;

[0028] 30. Valve stem;

[0029] 301, slider;

[0030] 40. Locking column;

[0031] 50. Stop column;

[0032] 60. Locking spring;

[0033] 70. Valve cover;

[0034] 701, stop flange;

[0035] 702, bearings;

[0036] 703, connecting plate;

[0037] 704. Filler;

[0038] 80. Driving wheel. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Figure 2 This is a schematic diagram of the structure of a gate valve in one embodiment of the present invention; Figure 3 for Figure 2 A partial enlarged view of the middle A; Figure 4 It is a structural schematic diagram of a gate valve in another embodiment of the present invention; Figure 5 for Figure 4 A partial enlarged view of point B in the middle.

[0041] Please refer to Figure 2-Figure 5The present embodiment provides a gate valve, comprising: a valve body 10, a valve plate 20, a valve stem 30 and a locking device; a valve cavity is provided inside the valve body 10, and the valve cavity is respectively formed with an inlet and an outlet at both ends of the valve body 10; a telescopic hole is provided on the side wall of the valve body 10, and the valve plate 20 extends into the valve cavity through the telescopic hole; a slot is provided on the inner wall of the valve cavity, and the valve plate 20 is inserted into the slot; a guide rail 101 is provided on the bottom of the slot, and a guide groove matching the guide rail 101 is provided on the valve plate 20; a sliding groove 201 is provided on the side of the valve plate 20 facing inward, and a slider 301 is provided at the bottom end of the valve stem 30, and the slider 301 is slidably arranged in the sliding groove 201; a locking device is provided on the valve plate 20, and is used to prevent the slider 301 from moving to the outside of the sliding groove 201.

[0042] Specifically, the valve body 10 can be in the shape of a column with a cross-section of a circle, rectangle, triangle, etc., or the valve body 10 can be in other irregular shapes; a valve cavity is formed by extending from one end of the valve body 10 to the other end, and an inlet and an outlet are formed at both ends of the valve cavity. A connecting portion is provided on the side wall of the valve body 10, and a telescopic hole is opened on the connecting portion, and the telescopic hole passes through the valve cavity; the valve plate 20 and the valve stem 30 extend into the valve cavity through the telescopic hole.

[0043] For ease of description, taking the valve body 10 as a cylindrical shape as an example, the inlet and outlet are openings formed at both ends of the valve cavity, respectively. The inlet pipe is connected to the inlet, the outlet pipe is connected to the outlet, the inlet pipe is connected to the upstream process, and the outlet pipe is connected to the downstream process. The valve body 10 can be mainly composed of metal materials such as copper, iron, and aluminum, or the valve body 10 is mainly composed of non-metallic materials such as plastic. A slot that cooperates with the valve plate 20 is provided in the valve cavity. When the valve plate 20 is driven to move into the valve cavity, the valve plate 20 is inserted into the slot, thereby closing the valve cavity to prevent oil and gas from flowing from the inlet to the outlet.

[0044] Preferably, a first connecting flange and a second connecting flange are respectively formed at both ends of the valve body 10, a first connecting hole is opened on the first connecting flange, and a second connecting hole is opened on the second connecting flange; a first assembly flange is formed on the outer side of the inlet pipe, a third connecting hole is opened on the first assembly flange, and a first fastening bolt is respectively passed through the first connecting hole and the third connecting hole to connect the first connecting flange and the first assembly flange together, thereby realizing the connection between the inlet pipe and the inlet; a second assembly flange is formed on the outer side of the outlet pipe, a fourth connecting hole is opened on the second assembly flange, and the second fastening bolt is respectively passed through the second connecting hole and the fourth connecting hole to realize the connection between the second connecting flange and the second assembly flange, thereby realizing the connection between the outlet and the outlet pipe.

[0045] Further preferably, a first sealing ring is sandwiched between the first connecting flange and the first assembly flange to enhance the sealing between the first connecting flange and the first assembly flange to prevent crude oil or natural gas from flowing out from between the first connecting flange and the first assembly flange. A second sealing ring is sandwiched between the second connecting flange and the second assembly flange to enhance the sealing between the second connecting flange and the second assembly flange to prevent crude oil or natural gas from flowing out from between the second connecting flange and the second assembly flange. The first sealing ring and the second sealing ring can both be rubber rings, and of course the first sealing ring and the second sealing ring can both be metal rings.

[0046] Specifically, the gate valve further includes a valve cover 70 and a driving device. The valve cover 70 is arranged on the outside of the telescopic hole. The valve cover 70 is provided with an axial hole. The valve stem 30 is inserted into the axial hole. The top end of the valve stem 30 is connected to the driving device. The valve cover 70 can close the telescopic hole to prevent the oil and gas in the valve cavity from flowing out to the outside through the telescopic hole.

[0047] It should be noted that the top of the valve cover 70 extends upward to form a connecting plate 703, the top of the connecting plate 703 forms a mounting portion, the shaft hole is set on the mounting portion, and the bottom end of the shaft hole facing the valve cavity is provided with a stop flange 701; a bearing 702 is provided in the shaft hole, the valve stem 30 is inserted into the inner ring of the bearing 702, the outer ring of the bearing 702 is connected to the side wall of the shaft hole, and the bearing 702 is located on the upper part of the stop flange 701. A stuffing box is also provided on the valve cover 70, the center line of the stuffing box is arranged in line with the center line of the shaft hole, and the stuffing box is connected to the valve cavity; the valve stem 30 is inserted into the valve cavity through the stuffing box, and in order to prevent the oil and gas in the valve cavity from flowing out, a stuffing 704 can be filled in the stuffing box.

[0048] Preferably, a sealing ring is provided between the valve cover 70 and the valve body 10 to improve the sealing between the valve cover 70 and the valve body 10 and prevent oil and gas from flowing out from between the valve cover 70 and the valve body 10 .

[0049] Further preferably, a first annular groove and a second annular groove are formed at the top end of the connecting portion and the bottom end of the valve cover 70, respectively, and sealing rings are respectively arranged in the first annular groove and the second annular groove, so as to further increase the contact area between the valve cover 70 and the connecting portion and the sealing ring, and further improve the sealing between the valve cover 70 and the valve body 10. The sealing ring can be a rubber ring or a metal ring.

[0050] Preferably, there can be multiple driving devices in this embodiment, as long as they can drive the valve stem 30 to move up and down; for example: the driving device may include a driving cylinder, the cylinder body of the driving cylinder is connected to the valve cover 70, and the piston rod of the driving cylinder is connected to the top of the valve stem 30. When the piston rod extends from the cylinder body, the valve stem 30 can be driven to move into the valve cavity. When the piston rod retracts into the cylinder body, the valve stem 30 moves to the outside of the valve cavity.

[0051] In this embodiment, the driving device preferably includes a driving wheel 80, which is coaxially arranged with the valve stem 30; a driving threaded hole is arranged on the driving wheel 80, and a driving external thread matching the driving threaded hole is arranged on the valve stem 30, and the driving wheel 80 is rotatably connected to the mounting portion on the valve cover 70. The valve stem 30 is driven to move up and down by twisting the driving wheel 80, which is simple to operate.

[0052] Preferably, the bearing 702 can be of various types, as long as it is ensured that the bearing 702 can bear radial force and a certain axial force. For example, when the mass and load of the valve plate 20 are small, the bearing 702 can be a deep groove ball bearing; when the mass and load of the valve plate 20 are large, the bearing 702 can be an angular contact ball bearing or a tapered roller bearing, etc., to bear a large axial force. In this embodiment, in order to ensure sufficient bearing capacity for the valve plate 20 to move up and down, the bearing 702 is preferably a thrust bearing.

[0053] Specifically, the valve stem 30 includes a first section and a second section, which are coaxially arranged and integrally formed; the first section is located at the upper part of the stuffing box, and a slider is provided at the end of the second section; a driving external thread is provided on the first section, and the driving external thread cooperates with the driving threaded hole, so that when the driving wheel 80 is twisted, the first section and the second section can be driven to move, thereby driving the valve plate 20 to move.

[0054] Specifically, the valve plate 20 can be a metal plate mainly composed of metal materials such as copper, iron, and aluminum, or a non-metal plate mainly composed of non-metal materials such as plastic and rubber. A slot is provided on the side wall of the valve cavity facing the valve plate 20; for ease of description, taking the valve cavity as a cylindrical shape as an example, the slot is an annular groove formed on the side wall of the valve cavity, and when the valve plate 20 extends into the valve cavity, the edge of the valve plate 20 slides in the annular groove; the guide rail 101 is provided at the bottom of the annular groove, so that when the valve plate 20 slides in the slot, the guide rail 101 passes through the guide groove on the valve plate 20 to prevent the valve plate 20 from shaking in the slot.

[0055] Preferably, in this embodiment, the guide rail 101 can be of various types, for example: the guide rail 101 can be a rubber plate attached to the bottom of the slot, or the guide rail 101 can be a plastic plate arranged on the bottom of the slot; of course, the guide rail 101 can also be a convex ridge protruding from the slot, in which case the guide rail 101 is integrally formed with the valve body 10. In this embodiment, the guide rail 101 is made of the same material as the valve body 10, and is made of metal.

[0056] Specifically, the slider 301 can be arranged at the bottom end of the valve stem 30 facing the valve plate 20. It should be noted that a notch connected to the slide groove 201 is opened on the valve plate 20, so that when the slider 301 is slid into the slide groove 201, the valve stem 30 is slid into the notch; the slider 301 can be cylindrical, prismatic or other columnar shapes, the slider 301 can also be spherical, ellipsoidal or the like, and of course the slider 301 can also be other irregular shapes, as long as it is ensured that when the valve stem 30 moves, the slider 301 can drive the valve plate 20 to move.

[0057] Specifically, the slide groove 201 can be set at the top of the valve plate 20. At this time, the slide groove 201 can be opened from the side of the valve plate 20 facing the inlet to the side facing the outlet. The slide groove 201 vertically penetrates the valve plate 20, and the slider 301 can slide into the slide groove 201 through the openings at both ends of the slide groove 201.

[0058] Specifically, there may be multiple locking devices in this embodiment, as long as the locking device can prevent the slider 301 from moving to the outside of the slide groove 201, so as to prevent the slider 301 from sliding out of the slide groove 201, thereby causing the valve stem 30 to disengage from the valve plate 20; for example: the locking device may include a locking plate, a stop groove is opened on the valve plate 20, the stop groove is connected to the slide groove 201, and the locking plate is inserted into the stop groove. The locking plate can prevent the slider 301 from moving to the outside of the slide groove 201; preferably, two stop grooves are opened at intervals on the valve plate 20, and a locking plate is inserted into each stop groove, so that the two locking plates clamp the slider 301 inside the slide groove 201 to prevent the slider 301 from moving to the openings at both ends of the slide groove 201. Alternatively, the locking device includes a stop bolt, a bolt hole penetrating into the slide groove 201 is opened on the valve plate 20, the stop bolt is screwed into the bolt hole, and the end of the stop bolt abuts against the slider 301, and the friction force between the stop bolt and the slider 301 prevents the slider 301 from moving out of the slide groove 201; or the stop bolt is located on the side of the slider 301 facing the opening, and at this time the stop bolt can prevent the slider 301 from moving toward the opening.

[0059] The installation process of the gate valve provided in this embodiment is as follows: first, slide the slider 301 on the valve stem 30 into the slide groove 201 on the valve plate 20, and use the locking device to lock the slider 301; insert the valve plate 20 into the slot on the inner wall of the valve cavity through the telescopic hole, and at the same time, slide the guide rail 101 into the guide groove on the valve plate 20; cover the valve cover 70 on the side wall of the valve body 10 to close the telescopic hole, and connect the valve cover 70 and the valve body 10; fill the stuffing box with stuffing 704 to seal the stuffing box; then set the bearing 702 in the shaft hole, and install the driving wheel 80 on the top of the valve stem 30, and make the lower part of the driving wheel 80 press against the bearing 702.

[0060] When in use, the driving wheel 80 is twisted in a preset direction, so that the valve stem 30 drives the valve plate 20 to move upward, so that the oil and gas at the inlet can flow to the outlet to open the gate valve; the driving wheel 80 is twisted in the opposite direction of the preset direction, so that the valve plate 20 is driven to move into the valve cavity, and the valve plate 20 is inserted in the slot to prevent the oil and gas from flowing from the inlet to the outlet, so as to close the gate valve. When impurities in the oil and gas corrode the guide rail 101, and then part of the guide rail 101 falls off, the valve plate 20 shakes in the slot, and the locking device can prevent the slider 301 from moving to the outside of the slide groove 201, so as to prevent the slider 301 from separating from the slide groove 201.

[0061] The gate valve provided in the present embodiment is provided with a valve cavity inside the valve body 10, and the valve cavity forms an inlet and an outlet at both ends of the valve body 10 respectively; a telescopic hole is opened on the side wall of the valve body 10, and the valve plate 20 extends into the valve cavity through the telescopic hole, and a slot is provided on the side wall of the valve cavity, and the valve plate 20 is inserted into the slot, and a guide rail 101 is provided on the bottom of the slot, and a guide groove matching the guide rail 101 is provided on the valve plate 20, and a slide groove 201 is provided on the valve plate 20, and a slider 301 is provided on the valve stem 30, and the slider 301 is slid in the slide groove 201, and a locking device is provided on the valve plate 20; when the guide rail 101 is corroded by impurities in the oil and gas and falls off, the valve plate 20 shakes in the slot, and the locking device can prevent the slider 301 from moving to the outside of the slide groove 201, thereby preventing the slider 301 from separating from the slide groove 201.

[0062] Continue to refer to Figure 2 and Figure 3 Specifically, the locking device includes a locking column 40, a first locking hole is provided on the valve plate 20, a second locking hole is provided on the slider 301, and the locking column 40 is inserted into the first locking hole and the second locking hole. The locking column 40 prevents the slider 301 from moving outward in the slide groove 201, and the locking is secure.

[0063] Preferably, the center line of the first locking hole can be set parallel to the axis of the valve stem 30, or the center line of the first locking hole can be set perpendicular to the axis of the valve stem 30. Of course, the center line of the first locking hole can also form a certain angle with the axis of the valve stem 30.

[0064] Specifically, a first internal thread is provided on the inner wall of the first locking hole, and a first external thread matching the first internal thread is provided on the locking column 40. The first internal thread matches the first external thread to prevent the locking column 40 from moving outside the first locking hole, thereby preventing the locking column 40 from falling out of the first locking hole and the second locking hole.

[0065] Specifically, a rotating part is provided at the end of the locking column 40. After the front end of the locking column 40 is inserted into the first locking hole, the locking column 40 is twisted by the rotating part so that the first external thread cooperates with the first internal thread for easy installation.

[0066] Preferably, the rotating part can be a rotating rod arranged at the end of the locking column 40, and the center line of the rotating rod is arranged perpendicular to the center line of the locking column 40. The locking column 40 can be driven to rotate by pulling the rotating rod; or the rotating part can be a rotating column with a regular hexagonal cross-section formed on the end of the locking column 40, which can be cooperated with the rotating column by a wrench during installation.

[0067] Preferably, a third plugging hole is provided on the side wall of the slide groove 201 opposite to the side wall where the first locking hole is located, and after the locking column 40 is inserted into the first locking hole and the second locking hole, the front end of the locking column 40 is inserted into the third plugging hole to further prevent the slider 301 from moving outward in the slide groove 201. Further preferably, the third plugging hole is a threaded hole, and the first external thread on the locking column 40 cooperates with the threaded hole.

[0068] Specifically, a second internal thread is provided on the inner wall of the second locking hole, and a second external thread matching the second internal thread is provided on the locking column 40. When the locking column 40 is broken, the broken locking column 40 can be directly taken out from the first locking hole, and only the valve stem 30 needs to be replaced, so as to avoid the waste of materials caused by the difficulty in taking out the broken locking column 40 in the first locking hole and then replacing the valve stem 30 and the valve plate 20.

[0069] Specifically, there are multiple locking columns 40, multiple first locking holes are provided on the valve plate 20, and multiple second locking holes are provided on the slider 301; each locking column 40 is inserted into one first locking hole and one second locking hole. Multiple locking columns 40 can improve the strength of the locking device. Preferably, when there are two locking columns 40, the two locking columns 40 can be respectively provided on both sides of the valve stem 30; of course, there can also be three or four locking columns 40.

[0070] Continue to refer to Figure 4 and Figure 5 Specifically, the locking device includes a stop post 50 and a locking spring 60. A sliding hole is provided on the slider 301. The stop post 50 is inserted into the sliding hole. The two ends of the locking spring 60 are respectively connected to the stop post 50 and the bottom of the sliding hole. A groove is provided on the side wall of the slide 201. The locking spring 60 is used to resist the stop post 50 to drive the stop post 50 to extend into the groove. In the process of sliding the slider 301 into the slide 201, the stop post 50 can be automatically slid into the groove under the drive of the locking spring 60, so as to lock the slider 301. The installation is convenient and the structure is simple.

[0071] Preferably, there are multiple stopper posts 50 and locking springs 60, and each locking spring 60 and stopper post 50 is inserted into a sliding hole. Multiple stopper posts 50 are simultaneously inserted into the grooves on the slideway 201, which can improve the strength of the locking device. Preferably, multiple stopper posts 50 are respectively extended from two planes on the slider 301 that are symmetrical to the axis of the valve stem 30, and correspondingly, grooves are respectively provided on two planes on the slideway that are symmetrical to the axis of the valve stem 30, so as to further enhance the stability of the slider 301.

[0072] Preferably, there can be only one groove on the side wall of the slide groove 201, in which case each stop column 50 is inserted into the same groove; or there can be multiple grooves arranged on the side wall of the slide groove 201, each groove corresponds to a sliding hole, and accordingly, each stop column 50 is inserted into a corresponding groove.

[0073] Taking the cylindrical stop post 50 as an example, the center line of the stop post 50 can be set perpendicular to the side wall of the chute, or the center line of the stop post 50 can be set parallel to the side wall of the chute. Of course, the stop post 50 can also be a prism with a regular shape such as a rectangle or triangle in cross section, and the cross section of the stop post 50 can also be other irregular shapes.

[0074] In the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral molding, it can be a mechanical connection, it can be an electrical connection, or it can communicate with each other; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gate valve, characterized in that: include: A valve body, a valve plate, a valve stem and a locking device; a valve cavity is arranged inside the valve body, and an inlet and an outlet are formed at two ends of the valve body respectively; a telescopic hole is arranged on the side wall of the valve body, and the valve plate extends into the valve cavity through the telescopic hole; a slot is arranged on the inner wall of the valve cavity, and the valve plate is inserted into the slot; a guide rail is arranged at the bottom of the slot, and a guide groove matching the guide rail is arranged on the valve plate; a slide groove is arranged on the valve plate, and a slider is arranged on the valve stem, and the slider is slidably arranged in the slide groove; the locking device is arranged on the valve plate, and is used to prevent the slider from moving to the outside of the slide groove; The locking device comprises a stop post and a locking spring, the slider is provided with a sliding hole, the stop post is inserted into the sliding hole, and the two ends of the locking spring are respectively connected to the stop post and the bottom of the sliding hole; a groove is provided on the side wall of the slide slot; the locking spring is used to resist the stop post to drive the stop post to extend into the groove; There are multiple stop posts and locking springs, and each of the locking springs and the stop post is inserted into one of the sliding holes; The gate valve also includes a valve cover and a driving device. The valve cover is arranged on the outside of the telescopic hole. An axial hole is arranged on the valve cover. The valve stem is inserted into the axial hole. The top end of the valve stem is drivingly connected to the driving device.

2. The gate valve according to claim 1, characterized in that: The driving device comprises a driving wheel, which is coaxially arranged with the valve stem, a driving threaded hole is arranged on the driving wheel, a driving external thread matched with the driving threaded hole is arranged on the valve stem, and the driving wheel is rotatably connected with the valve cover.

3. The gate valve according to claim 1, characterized in that: A sealing ring is arranged between the valve cover and the valve body.

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