Sliding gate valve

Abstract

The utility model discloses a sliding gate valve, which comprises a support and a mounting seat fixed with the support, a flow channel is arranged on the mounting seat, a longitudinal insertion hole is arranged on the mounting seat, a gate plate is inserted at the longitudinal insertion hole, a sealing strip is arranged on the longitudinal insertion hole, and a driving mechanism is arranged on the support. Annular blocks are arranged on the left side and the right side of the gate plate, sealing rings are arranged on the opposite face sides of the two annular blocks, micro gear motors are arranged at the side ends of the two annular blocks, threaded channel holes are formed in the side ends of the two annular blocks, threaded rods are fixed to rotating shafts of the micro gear motors, and self-lubricating layers are arranged on the outer contours of the annular blocks. First O-shaped sealing rings are arranged on the outer sides of the two circular ring blocks, and second O-shaped sealing rings are arranged on the inner sides of the two circular ring blocks. The gate valve is ingenious and reasonable in structural design, capable of being opened and closed easily, low in sealing ring abrasion, low in maintenance cost, long in service life and worthy of application and popularization.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a gate valve, particularly to a sliding gate valve. Background Art

[0002] The gate valve is a gate plate, the movement direction of which is perpendicular to the direction of the fluid. The gate valve can only be fully opened or fully closed, and cannot be adjusted or throttled. In the current gate valve, under high-pressure medium environment (for example, the medium pressure is high and the requirements for seals are extremely high), the seal on the pressure surface (the gate plate and the seal are perpendicular) is very likely to cause excessive wear of the seal due to the high friction with the gate plate when opening or resetting the gate plate, resulting in a reduction in the service life of the gate valve. To solve this problem, it is necessary to frequently replace the damaged seal. If the seal is not replaced in time, it will cause medium leakage, which will cause the problem of high cost of use. In addition, when replacing the seal, the conveying pipeline needs to be closed to disassemble and replace the seal, which will not only cause economic losses, but also greatly increase the cost of using the gate valve, which is not conducive to the profitability of the enterprise.

[0003] Chinese utility model patent CN 203703203 U discloses a double-seal single-disc flat gate valve, which is composed of a valve body, a valve seat, a gate, a sealing structure, a valve cover, a bracket, a hand wheel and an extended sleeve. The valve seat is arranged in the valve body, the gate passes through the middle of the valve seat and is inserted into the valve body, and the valve seat and the gate are tightly sealed. The valve cover is arranged on the valve body and is connected with the bracket, the hand wheel and the extended sleeve in sequence from bottom to top. A groove is arranged at the sealing position between the valve seat and the gate, and a sealing structure is inlaid on the groove. The sealing structure is composed of a low-pressure sealing ring and a high-pressure sealing ring. The low-pressure sealing ring is arranged above the high-pressure sealing ring, and the low-pressure sealing ring is arranged above the high-pressure sealing ring. The cross section of the low-pressure sealing ring is a right triangle, and the cross section of the high-pressure sealing ring is a rectangle. When this type of flat gate valve faces a high-pressure medium environment, the low-pressure sealing ring and the high-pressure sealing ring on the right side of the gate are subjected to huge extrusion pressure. When the gate moves up to fully open or down to fully close, the end face of the gate will exert great friction on the low-pressure sealing ring and the high-pressure sealing ring, making the low-pressure sealing ring and the high-pressure sealing ring more susceptible to wear and shortening their service life. It is necessary to frequently close the pipeline to disassemble and install the gate valve seal, and the maintenance cost is extremely high. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provide a sliding gate valve with a sealing ring that has no wear and tear and low maintenance cost, thereby meeting the requirements of a gate valve sealing ring that has no wear and tear, does not need to frequently replace the sealing ring, and has low maintenance cost.

[0005] The utility model solves the technical problem by adopting a technical solution: the sliding gate valve comprises a support and a mounting seat fixed with the support, a flow channel is formed on the mounting seat, a longitudinal plug hole connected with the flow channel is formed on the mounting seat, a gate for opening and closing the flow channel is plugged into the longitudinal plug hole, a sealing strip located between the support and the mounting seat is installed on the longitudinal plug hole, and a driving mechanism for driving the gate to move up and down is installed on the support; circular blocks are plugged into the left and right sides of the gate, sealing rings are installed on the opposite sides of the two circular blocks, and the two circular blocks are provided with sealing rings on the sides. A group of micro reduction motors are evenly distributed along the center of the circular ring block and fixed on the mounting seat are provided at each end. A group of threaded channel holes whose number and position match the micro reduction motor are opened at the side ends of the two circular ring blocks. A threaded rod that is threadedly matched with each threaded channel hole is fixed on the rotating shaft of each micro reduction motor. A self-lubricating layer is provided on the outer contour of the circular ring block. A first O-ring installed on the mounting seat is provided on the outer side of the two circular ring blocks, and a second O-ring installed on the mounting seat is provided on the inner side of the two circular ring blocks. The function of the flow channel here is to allow the medium to pass through; the function of the longitudinal plug hole here is to plug in the gate plate, so that the gate plate can be used to open and close the flow channel; the function of the driving mechanism here is to drive the gate plate up and down, so as to open and close the gate valve; the function of the sealing ring here is to seal the flow channel when the gate plate is in a closed state to prevent leakage of the medium; the function of the micro-reduction motor, threaded channel hole, threaded rod, and annular block here is to electrically drive the micro-reduction motor to drive the annular block to move, so that in the process of the gate plate moving up or down, the micro-reduction motor drives the annular block to move inward, so that the sealing ring is separated from the pressure on the gate plate, so that the sealing ring will not wear, and only when the gate plate is in a fully closed state will the micro-reduction motor drive the annular block to move outward. The sealing ring is pressed against the gate plate to prevent medium leakage. Compared with the traditional gate valve, this form has greatly improved the service life of the sealing ring, avoiding the tedious and high maintenance cost of stopping the pipeline to transport the medium to disassemble and install the gate valve to replace the sealing ring; the first O-ring and the second O-ring can start the sealing effect on the circular ring block when it moves, so as to prevent the medium from flowing out through the circular ring block; the role of the sealing strip is to prevent the medium from leaking out from the gap between the support and the mounting seat; the role of the self-lubricating layer is to make the friction resistance of the circular ring block extremely small when it is moved, so that each micro-reduction motor drives the threaded rod to rotate and drive the circular ring block to move inward and outward more easily. The self-lubricating layer can also prevent the circular ring block from getting stuck when moving. The self-lubricating layer is made of tin bronze material.

[0006] Further improvement, the driving mechanism includes a fixed block fixed with the top of the gate and located in the support cavity, a lead screw nut is fixed on the fixed block, a lead screw located in the support cavity is threadedly connected to the lead screw nut, a housing is fixed on the top of the support, a first bevel gear is rotatably connected in the housing, a second bevel gear meshing with the first bevel gear is rotatably connected in the housing, the first bevel gear cooperates with the lead screw, and the second bevel gear is driven by a first motor fixed on the housing. Here, the role of the lead screw nut, lead screw, housing, first bevel gear, second bevel gear, and first motor drive is to be able to drive the gate up and down to open and close by the first motor electric drive, and to control the gate valve with effort; the first motor drives the lead screw to rotate, which can drive the lead screw nut to move up and down, thereby driving the gate up and down, so as to conveniently and labor-savingly control the gate to open and close.

[0007] Further improvement, a square hole is opened in the center of the first bevel gear, a square rod is inserted in the square hole, a rotating shaft rotatably connected to the housing is fixed at the top of the square rod, the rotating shaft passes through the housing and a turntable is fixed at the top of the rotating shaft. The role of the square hole, square rod, rotating shaft and turntable here is that when the first motor fails or the power is off in an emergency, the gate valve can be opened and closed through the turntable to avoid danger.

[0008] The beneficial effects of the utility model are:

[0009] 1). In the process of opening and closing the gate valve by moving the gate up and down, the sealing ring is separated from the pressure on the gate. Only when the gate is in the closed state, the sealing ring will be pressed against the gate by the pressure of the ring block, which can not only avoid leakage, but also avoid the frequent maintenance and high cost caused by the rapid wear of the sealing ring under the action of strong friction;

[0010] 2). By driving the screw nut up and down through the screw, the up and down movement of the gate plate can be easily controlled, so that the opening and closing of the gate valve can be conveniently controlled;

[0011] 3). Not only can the gate plate be electrically driven to open and close the gate valve, but also when the motor fails and the gate valve cannot be electrically controlled, the gate valve can be opened and closed by manually rotating the turntable, avoiding the dangerous situation of being unable to control the gate valve when an accident occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The three-dimensional Figure 1 ;

[0013] Figure 2 The three-dimensional Figure 2 ;

[0014] Figure 3 It is a top view of the utility model;

[0015] Figure 4 for Figure 3 AA section view;

[0016] Figure 5 for Figure 4 A local enlarged view of area B;

[0017] Figure 6 for Figure 5 CC profile;

[0018] Figure 7 It is a structural schematic diagram of the circular ring block area in the utility model;

[0019] Figure 8 It is a structural schematic diagram of the screw nut area in the utility model;

[0020] Fig. 9 It is a structural schematic diagram of the square rod area in the utility model.

[0021] Explanation of the accompanying drawings: support 1, mounting seat 2, flow channel 2-1, longitudinal socket 2-2, gate 3, drive mechanism 4, fixing block 4-1, screw nut 4-2, screw 4-3, housing 4-4, first bevel gear 4-5, square hole 4-5a, second bevel gear 4-6, first motor 4-7, circular ring block 5, threaded channel hole 5-1, self-lubricating layer 5-2, sealing ring 6, micro reduction motor 7, threaded rod 8, first O-ring 9, second O-ring 10, square rod 11, rotating shaft 12, turntable 13, sealing strip 14. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings:

[0023] Referring to the accompanying drawings: This sliding gate valve comprises a support 1 and a mounting seat 2 fixed with the support 1, a flow channel 2-1 is formed on the mounting seat 2, a longitudinal plug hole 2-2 connected with the flow channel 2-1 is formed on the mounting seat 2, a gate 3 for opening and closing the flow channel 2-1 is plugged into the longitudinal plug hole 2-2, a sealing strip 14 located between the support 1 and the mounting seat 2 is installed on the longitudinal plug hole 2-2, and a driving mechanism 4 for driving the gate 3 to move up and down is installed on the support 1; circular blocks 5 are plugged into the left and right sides of the gate 3, and sealing rings 6 are installed on the opposite sides of the two circular blocks 5, and the side ends of the two circular blocks 5 A group of micro reduction motors 7 are evenly distributed along the center of the circular ring block 5 and fixed on the mounting seat 2. A group of threaded channel holes 5-1 whose number and position match the micro reduction motor 7 are opened on the side ends of the two circular ring blocks 5. A threaded rod 8 threadedly matched with each threaded channel hole 5-1 is fixed on the rotating shaft of each micro reduction motor 7. A self-lubricating layer 5-2 is provided on the outer contour of the circular ring block 5. The outer side of the two circular ring blocks 5 is provided with a first O-ring 9 installed on the mounting seat 2, and the inner side of the two circular ring blocks 5 is provided with a second O-ring 10 installed on the mounting seat 2.

[0024] The driving mechanism 4 includes a fixed block 4-1 fixed to the top of the gate plate 3 and located in the cavity of the support 1, a lead screw nut 4-2 is fixed on the fixed block 4-1, a lead screw nut 4-2 is threadedly connected to a lead screw 4-3 located in the cavity of the support 1, a housing 4-4 ​​is fixed to the top of the support 1, a first bevel gear 4-5 is rotatably connected in the housing 4-4, a second bevel gear 4-6 meshing with the first bevel gear 4-5 is rotatably connected in the housing 4-4, the first bevel gear 4-5 cooperates with the lead screw 4-3, and the second bevel gear 4-6 is driven by a first motor 4-7 fixed to the housing 4-4.

[0025] A square hole 4-5a is provided at the center of the first bevel gear 4-5, a square rod 11 is inserted into the square hole 4-5a, a rotating shaft 12 rotatably connected to the housing 4-4 ​​is fixed to the top of the square rod 11, the rotating shaft 12 passes through the housing 4-4 ​​and a turntable 13 is fixed to the top of the rotating shaft 12.

[0026] The working principle of the utility model is as follows: when the gate valve is in the full opening process, it is only necessary to start each micro reduction motor 7 first, so as to drive the threaded rod 8 to rotate in the opposite direction, thereby driving the annular block 5 to move inward, thereby making the sealing ring 6 break away from the pressure on the gate plate 3, and then start the first motor 4-7, the first motor 4-7 drives the second bevel gear 4-6 to rotate in the opposite direction, so that the second bevel gear 4-6 drives the first bevel gear 4-5 to rotate in the opposite direction, and then drives the lead screw 4-3 to rotate in the opposite direction through the first bevel gear 4-5, and the lead screw 4-3 rotates in the opposite direction, which will drive the lead screw nut 4-2 to move upward, and the upward movement of the lead screw nut 4-2 will synchronously drive the gate plate 3 to move upward and reach the fully open position of the gate valve (the sealing ring 6 does not contact the gate plate 3 and will not wear); when the gate valve is in the full closing process, the first motor 4-7 drives the second bevel gear 4-6 to rotate in the opposite direction, thereby driving the first bevel gear 4-5 to rotate in the opposite direction, and the first bevel gear 4-5 drives the lead screw 4-3 to rotate in the opposite direction, and the lead screw nut 4-2 rotates in the opposite direction, which will drive the lead screw nut 4-2 to move upward, and the upward movement of the lead screw nut 4-2 will synchronously drive the gate plate 3 to move upward and reach the fully open position of the gate valve (the sealing ring 6 does not contact the gate plate 3 and will not wear); when the gate valve is in the full closing process, the first motor 4-7 drives The second bevel gear 4-6 rotates forward, so that the second bevel gear 4-6 drives the first bevel gear 4-5 to rotate forward, and then drives the lead screw 4-3 to rotate forward through the first bevel gear 4-5. The forward rotation of the lead screw 4-3 will drive the lead screw nut 4-2 to move downward, and the downward movement of the lead screw nut 4-2 will simultaneously drive the gate plate 3 to move downward and reach the fully closed position of the gate valve. At this time, each micro-reduction motor 7 is started again to drive the threaded rod 8 to rotate forward, thereby driving the annular block 5 to move outward, thereby pressing the sealing ring 6 against the gate plate 3 to prevent the medium from leaking from the gate plate 3. Compared with the traditional gate valve, this form can not only avoid leakage, but also avoid the frequent maintenance and high use cost caused by the excessive wear of the sealing ring under the action of strong friction. It is worthy of promotion and application.

[0027] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A sliding gate valve, comprising a support (1) and a mounting seat (2) fixed to the support (1), wherein a flow channel (2-1) is formed on the mounting seat (2), and wherein: The mounting seat (2) is provided with a longitudinal plug hole (2-2) connected to the flow channel (2-1); a gate plate (3) for opening and closing the flow channel (2-1) is plugged into the longitudinal plug hole (2-2); a sealing strip (14) located between the support (1) and the mounting seat (2) is installed on the longitudinal plug hole (2-2); a driving mechanism (4) for driving the gate plate (3) to move up and down is installed on the support (1); circular blocks (5) are plugged into the left and right sides of the gate plate (3); sealing rings (6) are installed on the opposite sides of the two circular blocks (5); and a group of sealing rings (6) are evenly arranged and fixed along the center of the circular blocks (5) at the side ends of the two circular blocks (5). A micro reduction motor (7) on a mounting seat (2) is provided with a group of threaded channel holes (5-1) whose number and position match the micro reduction motor (7) at the side ends of the two circular blocks (5); a threaded rod (8) threadedly matched with each of the threaded channel holes (5-1) is fixed on the rotating shaft of each of the micro reduction motors (7); a self-lubricating layer (5-2) is provided on the outer contour of the circular blocks (5); a first O-ring (9) mounted on the mounting seat (2) is provided on the outer side of the two circular blocks (5); and a second O-ring (10) mounted on the mounting seat (2) is provided on the inner side of the two circular blocks (5).

2. A sliding gate valve according to claim 1, characterized in that: The driving mechanism (4) comprises a fixed block (4-1) fixed to the top of the gate plate (3); a lead screw nut (4-2) is fixed to the fixed block (4-1); a lead screw (4-3) is threadedly connected to the lead screw nut (4-2); a housing (4-4) is fixed to the top of the support (1); a first bevel gear (4-5) is rotatably connected to the housing (4-4); a second bevel gear (4-6) meshing with the first bevel gear (4-5) is rotatably connected to the housing (4-4); the first bevel gear (4-5) cooperates with the lead screw (4-3); and the second bevel gear (4-6) is driven by a first motor (4-7) fixed to the housing (4-4).

3. A sliding gate valve according to claim 2, characterized in that: A square hole (4-5a) is provided at the center of the first bevel gear (4-5), a square rod (11) is inserted into the square hole (4-5a), a rotating shaft (12) rotatably connected to the housing (4-4) is fixed to the top end of the square rod (11), the rotating shaft (12) passes through the housing (4-4) and a rotating disk (13) is fixed to the top end of the rotating shaft (12).

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