Gate valve and using method thereof

Abstract

The invention belongs to the technical field of gate valves, and particularly relates to a gate valve which comprises a main valve body, a main valve seat and a main valve core. The main valve cover is arranged on the main valve body, and a main valve rod is arranged in the main valve cover; the hand wheel is arranged at the top end of the main valve rod; the main gate plate is arranged in the main valve body and can be in sealing fit with the main valve seat; the two auxiliary valve covers are symmetrically arranged on the two sides of the main valve cover, and auxiliary valve rods are arranged in the auxiliary valve covers; the auxiliary valve seat is arranged in the main valve body; the auxiliary gate plate is arranged in the main valve body; the transmission gear set comprises a driving gear arranged in the main valve cover and a driven gear arranged in the auxiliary valve cover, the driving gear and the driven gear are in transmission connection through a first intermediate gear, and compared with the prior art, the working stability of the gate valve is improved, and the service life of the gate valve is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of valve technology, and in particular relates to a gate valve and a method for using the same. Background Art

[0002] The gate valve is a gate plate of an opening and closing part. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface will be welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. For example, a gate valve disclosed in the patent with application number CN202110849298.3 includes a valve body, a valve cover fixedly connected to the valve body, a gate plate installed in the valve body, a valve stem, and a handle fixedly connected to the valve stem. The valve body is provided with a main flow channel connected or blocked by the gate plate. The lower end of the valve stem is connected to a screw by a flat key. The lower part of the screw is threadedly connected to the gate plate to drive the gate plate to move up and down when the screw rotates. The gate valve also includes a double-layer valve seat adjustment device;

[0003] During the use of this existing gate valve, the sealing effect of the gate plate is prone to reduced during long-term use, and the gate plate is further impacted by the medium for a long time, which further reduces the service life of the gate plate. At the same time, some media may contain impurities, and the impurities accumulate inside the valve body during the medium transportation process, thereby affecting the movement of the gate plate and reducing the working stability of the gate valve. Therefore, it is necessary to make improvements. Summary of the invention

[0004] The object of the present invention is to provide a gate valve and a method for using the gate valve in order to improve the working stability and service life of the gate valve in view of the above-mentioned technical problems.

[0005] In view of this, the present invention provides a gate valve, comprising:

[0006] A main valve body, wherein a main valve seat is arranged in the main valve body;

[0007] A main valve cover, wherein the main valve cover is arranged on the main valve body and a main valve stem is arranged in the main valve cover;

[0008] A hand wheel, the hand wheel being arranged at the top end of the main valve stem;

[0009] A main gate plate, which is arranged in the main valve body and can be sealed with the main valve seat;

[0010] Also includes:

[0011] Auxiliary valve covers, the auxiliary valve covers have two and are symmetrically arranged on both sides of the main valve cover, and the auxiliary valve stem is arranged in the auxiliary valve cover;

[0012] Auxiliary valve seat, the auxiliary valve seat is arranged in the main valve body, and the auxiliary valve seat has two and is symmetrically arranged on both sides of the main valve seat;

[0013] Auxiliary gate plates, the auxiliary gate plates are arranged in the main valve body, and the auxiliary gate plates have two and are symmetrically distributed on both sides of the main gate plate;

[0014] A transmission gear set, the transmission gear set comprising a driving gear arranged in the main valve cover and a driven gear arranged in the auxiliary valve cover, the driving gear and the driven gear being transmission-connected via a first intermediate gear;

[0015] Among them, the bottom end of the main valve stem is connected to the main gate plate to drive the auxiliary gate plate to move up and down, the bottom end of the auxiliary valve stem is connected to the auxiliary gate plate to drive the auxiliary gate plate to move up and down, the auxiliary gate plate can be sealed with the auxiliary valve seat, the driving gear is arranged on the main valve stem, and the driven gear is arranged on the auxiliary valve stem.

[0016] In the present technical scheme, during the process of opening and closing the gate valve, the handwheel is turned, the handwheel drives the main valve stem to rotate, and the rotation of the main valve stem drives the main gate plate to move up and down. At the same time, under the action of the transmission gear set, the auxiliary valve stem rotates synchronously with the rotation of the main valve stem, thereby driving the auxiliary gate plate to move up and down. The main gate plate and the auxiliary gate plate descend to close the gate valve, and the main gate plate and the auxiliary gate plate rise to open the gate valve. When the gate valve is closed, multiple seals can be formed by the cooperation of the main gate plate and the auxiliary gate plate, thereby effectively improving the sealing effect and working stability of the gate valve. At the same time, under the protection of the auxiliary gate plates on both sides, the main gate plate can effectively reduce the impact of the medium on the main gate plate, thereby increasing the service life of the main gate plate, and then increasing the service life of the gate valve.

[0017] In the above technical solution, further, it also includes:

[0018] A pre-valve body is arranged at the liquid inlet end of the main valve body, and a pre-filter mechanism is arranged in the pre-valve body.

[0019] In the above technical solution, further, the pre-filter mechanism also includes:

[0020] There are two mounting grooves, which are symmetrically distributed on the inner wall of both sides of the front valve body along the radial direction of the front valve body;

[0021] A mounting frame, the mounting frame being arranged in the mounting slot;

[0022] A filter plate is arranged between the two mounting frames and is used for filtering the medium entering the main valve body.

[0023] In the above technical solution, further, it also includes:

[0024] A main movable groove, which is arranged in the front valve body and extends in a direction parallel to the axial direction of the front valve body, and a preload spring is arranged in the main movable groove;

[0025] Auxiliary movable grooves, the auxiliary movable grooves have two and are symmetrically distributed on the upper and lower sides of the main movable groove, the auxiliary movable grooves are arranged in the front valve body and are parallel to the main movable groove;

[0026] A scale movable groove, wherein the scale is movably arranged in the valve body and is located outside the main movable groove;

[0027] A main guide limit rod, the main guide limit rod is arranged in the middle of the side wall of the mounting frame, and a first rack is arranged on the outer side wall of the main guide limit rod;

[0028] Auxiliary guide limit rods, the auxiliary guide limit rods having two and symmetrically distributed on the upper and lower sides of the main guide limit rod, the auxiliary guide limit rods being arranged on the side wall of the mounting frame;

[0029] A ruler rod, the ruler rod is movably arranged in the ruler movable groove, the inner side wall of the ruler rod is provided with only a second rack, and the outer side wall of the ruler rod is provided with an indicating ruler;

[0030] a second intermediate gear, the second intermediate gear being rotatably disposed in the front valve body and being located between the first rack and the second rack;

[0031] Among them, one end of the main movable groove and one end of the auxiliary movable groove are both connected with the mounting groove, one end of the main guide limit rod is movably arranged in the main movable groove, one end of the preload spring is connected to the inner wall of the main movable groove, and the other end is connected to the main guide limit rod, one end of the auxiliary guide limit rod is movably arranged in the auxiliary movable groove, the mounting frame can move in a direction parallel to the axial direction of the front valve body, a sealing window connected with the scale movable groove is provided on the outer wall of the front valve body, and both sides of the intermediate gear are respectively meshed with the first rack and the second rack.

[0032] In the above technical solution, further, it also includes:

[0033] A buffer chamber, the buffer chamber is arranged in the front valve body and located above the intermediate gear, and a cylindrical shell is arranged in the buffer chamber;

[0034] A friction layer, the friction layer being arranged on the circumferential inner wall of the housing;

[0035] A rotating block, the rotating block is rotatably arranged in the housing, a plurality of radial grooves are arranged on the circumferential outer wall of the rotating block, and the plurality of radial grooves are evenly spaced along the circumference of the rotating block;

[0036] A friction block, which is movably arranged in the radial groove and can move radially along the rotating block;

[0037] A tension spring, wherein the tension spring is arranged in the radial groove, one end of the tension spring is connected to the friction block, and the other end of the tension spring is connected to the inner wall of the radial groove;

[0038] The rotating block is transmission-connected with the intermediate gear via a rotating shaft, and the outer end of the friction block can contact with the friction layer as the rotating speed of the rotating block increases.

[0039] In the above technical solution, further, it also includes:

[0040] A collection box, the collection box is arranged at the bottom of the front valve body and communicated with the interior of the front valve body;

[0041] A cleaning brush, the cleaning brush being arranged on the mounting frame and used for cleaning the filter surface of the filter plate;

[0042] The driving mechanism is arranged on the outer side wall of the mounting frame and is used for driving the cleaning brush to move up and down.

[0043] In the above technical solution, further, the driving mechanism also includes:

[0044] A waist-shaped convex block, wherein a waist-shaped groove is provided in the waist-shaped convex block, and an inner toothed bar extending and distributed along the outline direction of the waist-shaped groove is provided on the inner wall of the waist-shaped groove;

[0045] A limiting protrusion, wherein the limiting protrusion is arranged in the waist-shaped groove, the limiting protrusion is composed of a web and a wing plate arranged at the top of the web, the wing plate is in the shape of a waist-shaped plate, and the limiting protrusion is concentrically distributed with the waist-shaped groove;

[0046] a first rotating shaft, on which a limiting disc, a first transmission gear and a second transmission gear are disposed;

[0047] A transmission arm, wherein the transmission arm is arranged above the waist-shaped convex block, a motor bracket is arranged on the transmission arm, a driving motor is arranged on the motor bracket, and a third transmission gear is arranged on the driving end of the driving motor;

[0048] An opening, wherein the opening is arranged on the mounting frame;

[0049] A linear guide rail, wherein the linear guide rail is arranged on the outer side arm of the mounting frame, the linear guide rail has two and is symmetrically distributed on both sides of the opening, the linear guide rail is distributed along the vertical direction, and a slider is arranged on the linear guide rail;

[0050] Among them, a limiting slot is formed between the wing plate of the limiting protrusion and the bottom surface of the waist-shaped slot, the limiting disc is movably arranged in the limiting slot, the first transmission gear is meshed with the inner rack, the second transmission gear is meshed with the third transmission gear, the transmission arm is slidably connected to the top of the slider, and the end of the cleaning brush is connected to the transmission arm.

[0051] In the above technical solution, further, it also includes:

[0052] The baffle is arranged at the center of the filter plate and is integrally formed with the filter plate.

[0053] In the above technical solution, further, the present invention also discloses a method for using the above gate valve, comprising the following steps:

[0054] To open and close the S1 gate valve, turn the handwheel, which drives the main valve stem to rotate, and the main valve stem drives the main gate plate to move up and down. At the same time, under the action of the transmission gear set, the auxiliary valve stem rotates synchronously with the rotation of the main valve stem, thereby driving the auxiliary gate plate to move up and down. The main gate plate and the auxiliary gate plate descend to close the gate valve, and the main gate plate and the auxiliary gate plate rise to open the gate valve;

[0055] S2 pre-filtration: when the gate valve is opened, the medium enters the main valve body through the pre-valve body. During the process of the medium passing through the pre-valve body, the filter plate filters the impurities contained in the medium;

[0056] S3 filter plate blockage condition display: during the use of the filter plate, when the filter plate is gradually blocked by the filtered impurities, the efficiency of the medium passing through the filter plate is reduced, the pressure of the medium on the filter plate increases, and the filter plate is pushed under the action of pressure, driving the main guide limit rod to overcome the elastic force of the preload spring and move into the main movable groove. During the movement, the main guide limit rod drives the scale rod to move through the intermediate gear, and the scale rod moves to change the position of the indicator scale on it. The change of the indicator scale position can be viewed through the sealed window;

[0057] S4 filter plate cleaning: when the staff observes that the filter plate is clogged, the control driving mechanism starts, and the driving mechanism drives the cleaning brush to move up and down to clean the surface of the filter plate. The cleaned impurities fall down into the collection box under the action of gravity. When the pipeline stops working, the collection box can be opened to discharge the impurities.

[0058] S5 buffering: when a sudden increase in pressure such as water hammer effect occurs during medium transportation, the impact force of the medium acts on the filter plate, and the filter plate moves rapidly under the action of the impact force, driving the main guide limit rod to move rapidly into the main movable groove. At this time, the intermediate gear rotates rapidly at the same time, causing the rotating block connected to it through the rotating shaft to rotate rapidly. The friction block overcomes the elastic force of the tensioning spring and is thrown out of the radial groove and contacts the friction layer. The friction block rubs against the friction layer and converts the impact force into heat energy consumption.

[0059] In the present technical solution, the gate valve is used by the above method, which is simple and convenient to operate, and the gate valve has high working stability and long service life. At the same time, it can effectively reduce the impact of impurities in the medium on the main gate plate and the auxiliary gate plate. At the same time, the user can intuitively observe the blockage of the filter plate, and the filter plate is easy to clean and the cleaning effect is good.

[0060] The beneficial effects of the present invention are:

[0061] 1. The main gate plate and the auxiliary gate plate cooperate with each other to effectively improve the sealing effect of the gate valve. At the same time, under the protection of the auxiliary gate plates on both sides, the main gate plate can effectively reduce the impact of the medium, thereby increasing the service life of the main gate plate and thus the service life of the gate valve;

[0062] 2. The setting of the front valve body and the filter mechanism can effectively reduce the impact of impurities in the medium on the main gate and the auxiliary gate valve, thereby improving the working stability of the gate valve;

[0063] 3. Through the setting of the scale rod, the linkage between the scale rod and the filter plate can intuitively reflect the blockage of the filter plate, making it convenient for users to clean the filter plate in time;

[0064] 4. Through the cooperation between the friction block and the friction layer, the filter plate can provide filtering effect while buffering the impact of the medium, effectively reducing the impact of the medium on the main gate plate and the auxiliary gate plate, and further improving the working stability and service life of the gate valve;

[0065] 5. Through the setting of the driving mechanism, the cleaning brush can reciprocate and clean the filter plate in one direction, preventing impurities from spreading back into the medium during the cleaning process of the filter plate by the cleaning brush, thereby improving the cleaning effect of the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0067] Figure 1 It is a schematic structural diagram of a specific implementation method of the present invention.

[0068] Figure 2 It is a schematic diagram of the cross-sectional structure of the main valve body of the present invention.

[0069] Figure 3 It is a schematic diagram of the cross-sectional structure of the front valve body of the present invention.

[0070] Figure 4 It is a schematic diagram of the structure of the mounting frame of the present invention.

[0071] Figure 5 It is a schematic diagram of the cross-sectional structure of the driving mechanism of the present invention.

[0072] Figure 6 It is a schematic diagram of the cross-sectional structure of the rotating block of the present invention.

[0073] The symbols in the figure are:

[0074] 1. Main valve body; 2. Main valve seat; 3. Main valve cover; 4. Main valve stem; 5. Handwheel; 6. Main gate; 7. Auxiliary valve cover; 8. Auxiliary valve stem; 9. Auxiliary valve seat; 10. Auxiliary gate; 11. Driving gear; 12. Driven gear; 13. First intermediate gear; 14. Front valve body; 15. Mounting groove; 16. Mounting frame; 17. Filter plate; 18. Main movable groove; 19. Preload spring; 21. Scale movable groove; 22. Main guide limit rod; 23. First rack; 24. Auxiliary guide limit rod; 25. Scale rod; 26. Second rack; 27. Second intermediate gear Wheel; 28. Sealing window; 29. ​​Shell; 30. Friction layer; 31. Rotating block; 32. Radial groove; 33. Friction block; 34. Tension spring; 35. Collecting box; 36. Cleaning brush; 37. Waist-shaped protrusion; 38. Waist-shaped groove; 39. Internal rack; 40. Limiting protrusion; 41. First rotating shaft; 42. Limiting disk; 43. First transmission gear; 44. Second transmission gear; 45. Transmission arm; 46. Motor bracket; 47. Driving motor; 48. Third transmission gear; 49. Opening; 50. Linear guide; 51. Slider; 52. Baffle. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0076] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0077] Embodiment 1:

[0078] The embodiment of the present application provides a gate valve, comprising: a main valve body 1, in which a main valve seat 2 is arranged; a main valve cover 3, in which the main valve cover 3 is arranged on the main valve body 1, in which a main valve stem 4 is arranged; a hand wheel 5, in which the hand wheel 5 is arranged at the top end of the main valve stem 4; a main gate plate 6, in which the main gate plate 6 is arranged in the main valve body 1 and can be sealed with the main valve seat 2;

[0079] It also includes: an auxiliary valve cover 7, the auxiliary valve cover 7 has two and is symmetrically arranged on both sides of the main valve cover 3, and an auxiliary valve stem 8 is arranged in the auxiliary valve cover 7; an auxiliary valve seat 9, the auxiliary valve seat 9 is arranged in the main valve body 1, and the auxiliary valve seat 9 has two and is symmetrically arranged on both sides of the main valve seat 2; an auxiliary gate plate 10, the auxiliary gate plate 10 is arranged in the main valve body 1, and the auxiliary gate plate 10 has two and is symmetrically distributed on both sides of the main gate plate 6; a transmission gear set, the transmission gear set includes a driving gear 11 arranged in the main valve cover 3 and a driven gear 12 arranged in the auxiliary valve cover 7, and the driving gear 11 and the driven gear 12 are connected by a first intermediate gear 13;

[0080] Among them, the bottom end of the main valve stem 4 is transmission connected with the main gate plate 6 to drive the auxiliary gate plate 10 to move up and down, the bottom end of the auxiliary valve stem 8 is transmission connected with the auxiliary gate plate 10 to drive the auxiliary gate plate 10 to move up and down, the auxiliary gate plate 10 can be sealed with the auxiliary valve seat 9, the driving gear 11 is arranged on the main valve stem 4, and the driven gear 12 is arranged on the auxiliary valve stem 8.

[0081] Moreover, the auxiliary valve cover 7 and the main valve cover 3 can be integrally formed, and conventional gate movable cavities are provided in the auxiliary valve cover 7 and the main valve cover 3. The main valve cover 3 and the main valve cover, and the auxiliary valve stem 8 and the auxiliary valve cover 7 are conventionally movable. The auxiliary valve stem 8 and the auxiliary gate 10, and the main valve stem 4 and the main gate 6 are conventionally transmitted connections, which can be specifically threaded connections, and the threads on the two auxiliary valve stems 8 have opposite rotation directions.

[0082] In this embodiment, during the process of opening and closing the gate valve, the hand wheel 5 is rotated, the hand wheel 5 drives the main valve stem 4 to rotate, and the rotation of the main valve stem 4 drives the main gate plate 6 to move up and down. At the same time, under the action of the transmission gear set, the auxiliary valve stem 8 rotates synchronously with the rotation of the main valve stem 4, thereby driving the auxiliary gate plate 10 to move up and down, the main gate plate 6 and the auxiliary gate plate 10 descend to close the gate valve, and the main gate plate 6 and the auxiliary gate plate 10 rise to open the gate valve. When the gate valve is closed, multiple seals can be formed by the cooperation of the main gate plate 6 and the auxiliary gate plate 10, thereby effectively improving the sealing effect of the gate valve. At the same time, under the protection of the auxiliary gate plates 10 on both sides, the main gate plate 6 can effectively reduce the impact of the medium, thereby increasing the service life of the main gate plate 6, and then increasing the service life of the gate valve.

[0083] Embodiment 2:

[0084] This embodiment provides a gate valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: a pre-valve body 14, which is arranged at the liquid inlet end of the main valve body 1, and a pre-filter mechanism is arranged in the pre-valve body 14.

[0085] The pre-filter mechanism also includes: a mounting groove 15, which has two mounting grooves 15 and is symmetrically distributed on the inner wall of the pre-valve body 14 on both sides of the pre-valve body 14 along the radial direction; a mounting frame 16, which is arranged in the mounting groove 15; and a filter plate 17, which is arranged between the two mounting frames 16 for filtering the medium entering the main valve body 1.

[0086] In this embodiment, during the medium transportation process, the medium enters the main valve body 1 through the pre-valve body 14. In the process of the medium passing through the pre-valve body 14, the filter plate 17 can effectively filter the impurities contained in the medium, thereby preventing the impurities in the medium from affecting the main gate plate 6 and the auxiliary gate valve, thereby improving the working stability of the gate valve.

[0087] Embodiment 3:

[0088] The present embodiment provides a gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features, including: a main movable groove 18, which is arranged in the front valve body 14 and extends in a direction parallel to the axial direction of the front valve body 14, and a preload spring 19 is arranged in the main movable groove 18; a secondary movable groove, which has two secondary movable grooves and is symmetrically distributed on the upper and lower sides of the main movable groove 18, and the secondary movable groove is arranged in the front valve body 14 and is parallel to the main movable groove 18; a scale movable groove 21, which is movably arranged in the valve body and located on the outside of the main movable groove 18; a main guide limit rod 22, which is arranged in the installation In the middle of the side wall of the mounting frame 16, a first rack 23 is arranged on the outer side wall of the main guide limit rod 22; a secondary guide limit rod 24, the secondary guide limit rod 24 has two and is symmetrically distributed on the upper and lower sides of the main guide limit rod 22, and the secondary guide limit rod 24 is arranged on the side wall of the mounting frame 16; a scale rod 25, the scale rod 25 is movably arranged in the scale movable groove 21, the inner side wall of the scale rod 25 is provided with only a second rack 26, and the outer side wall of the scale rod 25 is provided with an indicating scale; a second intermediate gear 27, the second intermediate gear 27 is rotatably arranged in the front valve body 14 and is located between the first rack 23 and the second rack 26;

[0089] Among them, one end of the main movable groove 18 and one end of the auxiliary movable groove are both connected to the mounting groove 15, one end of the main guide limit rod 22 is movably arranged in the main movable groove 18, one end of the preload spring 19 is connected to the inner wall of the main movable groove 18, and the other end is connected to the main guide limit rod 22, one end of the auxiliary guide limit rod 24 is movably arranged in the auxiliary movable groove, the mounting frame 16 can move in a direction parallel to the axial direction of the front valve body 14, and a sealing window 28 connected to the scale movable groove 21 is provided on the outer wall of the front valve body 14, and the two sides of the intermediate gear are respectively engaged with the first rack 23 and the second rack 26.

[0090] In this embodiment, during the use of the filter plate 17, when the filter plate 17 is gradually clogged by the filtered impurities, the efficiency of the medium passing through the filter plate 17 is reduced, and the pressure of the medium on the filter plate 17 is increased. The filter plate 17 is pushed under the action of the pressure, driving the main guide limit rod 22 to overcome the elastic force of the preload spring 19 and move into the main movable groove 18. During the movement, the main guide limit rod 22 drives the scale rod 25 to move through the intermediate gear. During the movement of the scale rod 25, the position of the indicating scale on it is changed. The change in the position of the indicating scale is viewed through the sealed window 28, so that the user can intuitively see the blockage of the filter plate 17, which is convenient for the user to maintain and clean the filter plate 17 in time, thereby improving the stability of the gate valve.

[0091] Embodiment 4:

[0092] This embodiment provides a gate valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: a buffer chamber, which is arranged in the front valve body 14 and above the intermediate gear, and a cylindrical shell 29 is arranged in the buffer chamber; a friction layer 30, which is arranged on the circumferential inner wall of the shell 29; a rotating block 31, which is rotatably arranged in the shell 29, and a plurality of radial grooves 32 are arranged on the circumferential outer wall of the rotating block 31, and the plurality of radial grooves 32 are evenly spaced along the circumference of the rotating block 31; a friction block 33, which is movably arranged in the radial groove 32 and can move radially along the rotating block 31; a tension spring 34, which is arranged in the radial groove 32, and one end of the tension spring 34 is connected to the friction block 33, and the other end is connected to the inner wall of the radial groove 32;

[0093] The rotating block 31 is connected to the intermediate gear through a rotating shaft, and the outer end of the friction block 33 can contact the friction layer 30 as the rotation speed of the rotating block 31 increases.

[0094] The filter plate 17 further includes a baffle plate 52 , which is disposed at the center of the filter plate 17 and is formed integrally with the filter plate 17 .

[0095] In this embodiment, when a sudden increase in pressure such as a water hammer effect occurs during the medium conveying process, the impact force of the medium acts on the filter plate 17. Through the setting of the baffle 52, the filter plate 17 can better withstand the impact of the medium. The filter plate 17 moves rapidly under the action of the impact force, driving the main guide limit rod 22 to move rapidly into the main movable groove 18. While the main guide limit rod 22 moves rapidly, it drives the intermediate gear to rotate through the first rack 23, so that the intermediate gear rotates rapidly at the same time, and then the rotating block 31 connected to it through the rotating shaft rotates rapidly. The rotating block 31 rotates rapidly, so that the friction block 33 overcomes the elastic force of the tension spring 34, is thrown out of the radial groove 32 and is in contact with the friction layer 30, the friction block 33 rubs against the friction layer 30 and converts the impact force into heat energy consumption, which effectively buffers the impact of the medium. After the impact of the medium, the main guide limit rod 22 is reset under the action of the preload spring 19, so that the filter plate 17 returns to a balanced state. Under normal circumstances, the filter plate 17 moves slowly, so that the rotation speed of the rotating block 31 is low, and the friction block 33 cannot overcome the elastic force of the tensioning spring 34 and is always located in the radial groove 32, ensuring that the movement of the scale rod 25 can accurately reflect the blockage of the filter plate 17. Compared with the prior art, the present invention can provide a filtering effect while buffering the impact of the medium, thereby further improving the working stability and service life of the gate.

[0096] Embodiment 5:

[0097] The present embodiment provides a gate valve, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features, including: a collecting box 35, which is arranged at the bottom of the front valve body 14 and is connected to the interior of the front valve body 14; a cleaning brush 36, which is arranged on the mounting frame 16 for cleaning the filter surface of the filter plate 17; and a driving mechanism, which is arranged on the outer wall of the mounting frame 16 for driving the cleaning brush 36 to move up and down.

[0098] In this embodiment, when the staff observes that the filter plate 17 is clogged, the control driving mechanism is started, and the driving mechanism drives the cleaning brush 36 to move up and down to clean the surface of the filter plate 17. The cleaned impurities fall downward into the collection box 35 under the action of gravity. When the pipeline stops working, the collection box 35 is opened to discharge the impurities. Compared with the prior art, the present invention can effectively clean the impurities filtered on the filter plate 17 and ensure that the filter plate 17 can work stably.

[0099] Embodiment 5:

[0100] The present embodiment provides a gate valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the driving mechanism also includes: a waist-shaped protrusion 37, a waist-shaped groove 38 is provided in the waist-shaped protrusion 37, and an inner rack 39 extending and distributed along the contour direction of the waist-shaped groove 38 is provided on the inner wall of the waist-shaped groove 38; a limiting protrusion 40, the limiting protrusion 40 is provided in the waist-shaped groove 38, the limiting protrusion 40 is composed of a web and a wing plate provided at the top of the web, the wing plate is waist-shaped, and the limiting protrusion 40 is concentrically distributed with the waist-shaped groove 38; a first rotating shaft 41, a limiting disc 42 is provided on the first rotating shaft 41, A first transmission gear 43 and a second transmission gear 44; a transmission arm 45, the transmission arm 45 is arranged above the waist-shaped protrusion 37, a motor bracket 46 is arranged on the transmission arm 45, a driving motor 47 is arranged on the motor bracket 46, and a third transmission gear 48 is arranged on the driving end of the driving motor 47; an opening 49, the opening 49 is arranged on the mounting frame 16; a linear guide 50, the linear guide 50 is arranged on the outer arm of the mounting frame 16, the linear guide 50 has two and is symmetrically distributed on both sides of the opening 49, the linear guide 50 is distributed in the vertical direction, and a slider 51 is arranged on the linear guide 50;

[0101] Among them, a limiting slot is formed between the wing plate of the limiting protrusion 40 and the bottom surface of the waist-shaped groove 38, the limiting disc 42 is movably arranged in the limiting slot, the first transmission gear 43 is meshed with the inner rack 39, the second transmission gear 44 is meshed with the third transmission gear 48, the transmission arm 45 is slidably connected to the top of the slider 51, and the end of the cleaning brush 36 is connected to the transmission arm 45.

[0102] Moreover, the size of the opening 49 is comparable to that of the waist-shaped groove, and the end of the cleaning brush 36 passes through the opening 49 and is connected to the transmission arm 45. The driving motor 47 can be a conventional self-locking motor.

[0103] In this embodiment, when cleaning the filter plate 17, the driving motor 47 drives the third transmission gear 48 to rotate, and the rotation of the third transmission gear 48 drives the second transmission gear 44 meshing therewith to rotate, and the first rotating shaft 41 rotates with the rotation of the second transmission gear 44, thereby driving the first transmission gear 43 to rotate, and the first transmission gear 43 meshes with the inner rack 39, thereby driving the transmission arm 45 to move along the contour direction of the waist groove during the rotation process. When the cleaning brush 36 descends, the transmission gear meshes with the edge of the inner rack 39 close to the main valve body 1, so that the cleaning brush 36 contacts the surface of the filter plate 17. The cleaning brush 36 descends and brushes down the impurities filtered on the filter plate 17. When the cleaning brush 36 moves to the bottom, the first transmission gear 43 moves along the bottom edge of the waist-shaped groove to the other side of the waist-shaped groove and meshes with the edge of the inner rack 39 away from the main valve body 1, so that the cleaning brush 36 does not contact the surface of the filter plate 17 during the rising and resetting process, preventing the cleaning brush 36 from always contacting the surface of the filter plate 17 during the up and down movement, thereby preventing the impurities from being attached to the filter plate 17 for the second time and causing the impurities to spread back into the medium. Compared with the prior art, the present invention effectively improves the cleaning effect of the cleaning brush 36 on the filter plate 17.

[0104] Embodiment 6:

[0105] This embodiment provides a method for using a gate valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including the following steps:

[0106] To open and close the S1 gate valve, turn the hand wheel 5, which drives the main valve stem 4 to rotate, and the main valve stem 4 drives the main gate plate 6 to move up and down. At the same time, under the action of the transmission gear set, the auxiliary valve stem 8 rotates synchronously with the rotation of the main valve stem 4, thereby driving the auxiliary gate plate 10 to move up and down. The main gate plate 6 and the auxiliary gate plate 10 descend to close the gate valve, and the main gate plate 6 and the auxiliary gate plate 10 rise to open the gate valve;

[0107] S2 pre-filtration, when the gate valve is opened, the medium enters the main valve body 1 through the pre-valve body 14. During the process of the medium passing through the pre-valve body 14, the filter plate 17 filters the impurities contained in the medium;

[0108] S3 shows the clogging condition of the filter plate 17. During the use of the filter plate 17, when the filter plate 17 is gradually clogged by the impurities filtered out, the efficiency of the medium passing through the filter plate 17 is reduced, and the pressure of the medium on the filter plate 17 is increased. The filter plate 17 is pushed under the action of the pressure, driving the main guide limit rod 22 to overcome the elastic force of the preload spring 19 and move into the main movable groove 18. The main guide limit rod 22 drives the scale rod 25 to move through the intermediate gear during the movement. The scale rod 25 drives the position of the indicator scale on it to change during the movement. The change of the indicator scale position can be viewed through the sealed window 28;

[0109] S4: Cleaning of the filter plate 17. When the staff observes that the filter plate 17 is clogged, the control driving mechanism is started, and the driving mechanism drives the cleaning brush 36 to move up and down to clean the surface of the filter plate 17. The cleaned impurities fall downward into the collection box 35 under the action of gravity. When the pipeline stops working, the collection box 35 is opened to discharge the impurities.

[0110] S5 buffering, when a sudden increase in pressure such as water hammer effect occurs during medium transportation, the impact force of the medium acts on the filter plate 17, and the filter plate 17 moves rapidly under the action of the impact force, driving the main guide limit rod 22 to move rapidly into the main movable groove 18. At this time, the intermediate gear rotates rapidly at the same time, so that the rotating block 31 connected to it through the rotating shaft rotates rapidly, and the friction block 33 overcomes the elastic force of the tensioning spring 34 and is thrown out of the radial groove 32 and contacts the friction layer 30. The friction block 33 rubs against the friction layer 30 to convert the impact force into heat energy consumption.

[0111] In this embodiment, the gate valve is used by the above method, which is simple and convenient to operate, and the gate valve has high working stability and long service life. At the same time, it can effectively reduce the impact of impurities in the medium on the main gate plate 6 and the auxiliary gate plate 10. At the same time, the user can intuitively observe the blockage of the filter plate 17, and the filter plate 17 is easy to clean and the cleaning effect is good.

[0112] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A gate valve, comprising: A main valve body (1), wherein a main valve seat (2) is arranged in the main valve body (1); A main valve cover (3), wherein the main valve cover (3) is arranged on the main valve body (1), and a main valve stem (4) is arranged in the main valve cover (3); A hand wheel (5), wherein the hand wheel (5) is arranged at the top end of the main valve stem (4); A main gate plate (6), wherein the main gate plate (6) is arranged in the main valve body (1) and can be sealed with the main valve seat (2); It is characterized by further comprising: An auxiliary valve cover (7), wherein the auxiliary valve cover (7) has two parts and is symmetrically arranged on both sides of the main valve cover (3), and an auxiliary valve stem (8) is arranged in the auxiliary valve cover (7); Auxiliary valve seat (9), the auxiliary valve seat (9) is arranged in the main valve body (1), and the auxiliary valve seat (9) has two and is symmetrically arranged on both sides of the main valve seat (2); Auxiliary gate plates (10), the auxiliary gate plates (10) being arranged in the main valve body (1), and the auxiliary gate plates (10) having two and symmetrically distributed on both sides of the main gate plate (6); A transmission gear set, the transmission gear set comprising a driving gear (11) arranged in the main valve cover (3) and a driven gear (12) arranged in the auxiliary valve cover (7), the driving gear (11) and the driven gear (12) being transmission-connected via a first intermediate gear (13); The bottom end of the main valve stem (4) is connected to the main gate plate (6) in a transmission manner to drive the auxiliary gate plate (10) to move up and down, the bottom end of the auxiliary valve stem (8) is connected to the auxiliary gate plate (10) in a transmission manner to drive the auxiliary gate plate (10) to move up and down, the auxiliary gate plate (10) can be sealed with the auxiliary valve seat (9), the driving gear (11) is arranged on the main valve stem (4), and the driven gear (12) is arranged on the auxiliary valve stem (8).

2. A gate valve according to claim 1, characterized in that: Also includes: A pre-valve body (14) is arranged at the liquid inlet end of the main valve body (1), and a pre-filter mechanism is arranged in the pre-valve body (14).

3. A gate valve according to claim 2, characterized in that: The pre-filter mechanism also includes: A mounting groove (15), wherein the mounting groove (15) has two portions and is symmetrically distributed along the radial direction of the front valve body (14) on the inner wall of both sides of the front valve body (14); A mounting frame (16), wherein the mounting frame (16) is arranged in the mounting groove (15); A filter plate (17) is arranged between two mounting frames (16) and is used for filtering a medium entering the main valve body (1).

4. A gate valve according to claim 3, characterized in that: Also includes: a main movable groove (18), the main movable groove (18) being arranged in the front valve body (14) and extending in a direction parallel to the axial direction of the front valve body (14), and a preload spring (19) being arranged in the main movable groove (18); A secondary movable groove, the secondary movable groove having two portions and symmetrically distributed on the upper and lower sides of the main movable groove (18), the secondary movable groove being arranged in the front valve body (14) and parallel to the main movable groove (18); A scale movable groove (21), wherein the scale is movably arranged in the valve body and is located outside the main movable groove (18); A main guide limit rod (22), the main guide limit rod (22) being arranged in the middle of a side wall of the mounting frame (16), and a first rack (23) being arranged on an outer side wall of the main guide limit rod (22); Auxiliary guide limit rods (24), the auxiliary guide limit rods (24) having two and symmetrically distributed on the upper and lower sides of the main guide limit rod (22), the auxiliary guide limit rods (24) being arranged on the side wall of the mounting frame (16); A ruler rod (25), the ruler rod (25) being movably arranged in the ruler movable groove (21), the inner side wall of the ruler rod (25) being provided with only a second rack (26), and the outer side wall of the ruler rod (25) being provided with an indicating ruler; a second intermediate gear (27), the second intermediate gear (27) being rotatably disposed in the front valve body (14) and being located between the first rack (23) and the second rack (26); One end of the main movable groove (18) and one end of the auxiliary movable groove are both connected to the mounting groove (15); one end of the main guide limit rod (22) is movably inserted into the main movable groove (18); one end of the preload spring (19) is connected to the inner wall of the main movable groove (18), and the other end is connected to the main guide limit rod (22); one end of the auxiliary guide limit rod (24) is movably inserted into the auxiliary movable groove; the mounting frame (16) can move in a direction parallel to the axial direction of the front valve body (14); a sealing window (28) connected to the scale movable groove (21) is provided on the outer wall of the front valve body (14); and two sides of the intermediate gear are respectively meshed with the first rack (23) and the second rack (26).

5. A gate valve according to claim 4, characterized in that: Also includes: A buffer chamber, the buffer chamber is arranged in the front valve body (14) and is located above the intermediate gear, and a cylindrical housing (29) is arranged in the buffer chamber; A friction layer (30), wherein the friction layer (30) is arranged on the circumferential inner wall of the housing (29); A rotating block (31), the rotating block (31) being rotatably disposed in the housing (29), a plurality of radial grooves (32) being disposed on a circumferential outer wall of the rotating block (31), and the plurality of radial grooves (32) being evenly spaced and distributed along the circumference of the rotating block (31); A friction block (33), wherein the friction block (33) is movably disposed in the radial groove (32) and can move radially along the rotating block (31); A tension spring (34), wherein the tension spring (34) is arranged in the radial groove (32), one end of the tension spring (34) is connected to the friction block (33), and the other end of the tension spring (34) is connected to the inner wall of the radial groove (32); The rotating block (31) is connected to the intermediate gear through a rotating shaft, and the outer end of the friction block (33) can contact the friction layer (30) as the rotation speed of the rotating block (31) increases.

6. A gate valve according to claim 5, characterized in that: Also includes: A collection box (35), the collection box (35) being arranged at the bottom of the front valve body (14) and being in communication with the interior of the front valve body (14); a cleaning brush (36), the cleaning brush (36) being arranged on the mounting frame (16) and being used for cleaning the filtering surface of the filter plate (17); A driving mechanism is arranged on the outer side wall of the mounting frame (16) and is used to drive the cleaning brush (36) to move up and down.

7. A gate valve according to claim 6, characterized in that: The driving mechanism further comprises: A waist-shaped convex block (37), wherein a waist-shaped groove (38) is provided in the waist-shaped convex block (37), and an inner toothed rack (39) extending and distributed along the contour direction of the waist-shaped groove (38) is provided on the inner wall of the waist-shaped groove (38); A limiting protrusion (40), the limiting protrusion (40) being arranged in the waist-shaped groove (38), the limiting protrusion (40) being composed of a web and a wing plate arranged at the top of the web, the wing plate being in the shape of a waist-shaped plate, and the limiting protrusion (40) being distributed concentrically with the waist-shaped groove (38); A first rotating shaft (41), on which a limiting disc (42), a first transmission gear (43) and a second transmission gear (44) are arranged; A transmission arm (45), the transmission arm (45) being arranged above the waist-shaped protrusion (37), the transmission arm (45) being provided with a motor bracket (46), the motor bracket (46) being provided with a driving motor (47), and a third transmission gear (48) being provided on a driving end of the driving motor (47); An opening (49), wherein the opening (49) is disposed on the mounting frame (16); A linear guide rail (50), the linear guide rail (50) being arranged on an outer side arm of the mounting frame (16), the linear guide rail (50) having two portions symmetrically distributed on both sides of the opening (49), the linear guide rail (50) being distributed in a vertical direction, and a slider (51) being arranged on the linear guide rail (50); A limiting slot is formed between the wing plate of the limiting protrusion (40) and the bottom surface of the waist-shaped slot (38), the limiting disc (42) is movably arranged in the limiting slot, the first transmission gear (43) is meshed with the inner rack (39), the second transmission gear (44) is meshed with the third transmission gear (48), the transmission arm (45) is slidably connected to the top of the slider (51), and the end of the cleaning brush (36) is connected to the transmission arm (45).

8. A gate valve according to claim 7, characterized in that: Also includes: A baffle (52) is arranged at the center of the filter plate (17) and is integrally formed with the filter plate (17).

9. A method for using the gate valve according to claim 8, characterized in that: The following steps are involved: To open or close the S1 gate valve, the hand wheel (5) is turned, and the hand wheel (5) drives the main valve stem (4) to rotate. The rotation of the main valve stem (4) drives the main gate plate (6) to move up and down. At the same time, under the action of the transmission gear set, the auxiliary valve stem (8) rotates synchronously with the rotation of the main valve stem (4), thereby driving the auxiliary gate plate (10) to move up and down. The main gate plate (6) and the auxiliary gate plate (10) descend to close the gate valve, and the main gate plate (6) and the auxiliary gate plate (10) rise to open the gate valve; S2 pre-filtration, when the gate valve is opened, the medium enters the main valve body (1) through the pre-valve body (14), and the filter plate (17) filters the impurities contained in the medium during the process of the medium passing through the pre-valve body (14); S3 shows the clogging condition of the filter plate (17). During the use of the filter plate (17), when the filter plate (17) is gradually clogged by the impurities filtered out, the efficiency of the medium passing through the filter plate (17) is reduced, and the pressure of the medium on the filter plate (17) is increased. The filter plate (17) is pushed under the action of the pressure, driving the main guide limit rod (22) to overcome the elastic force of the preload spring (19) and move into the main movable groove (18). During the movement, the main guide limit rod (22) drives the scale rod (25) to move through the intermediate gear. During the movement of the scale rod (25), the position of the indicator scale on it is changed. The change of the indicator scale position is checked through the sealed window (28); S4: cleaning of the filter plate (17). When the staff observes that the filter plate (17) is clogged, the control driving mechanism is started, and the driving mechanism drives the cleaning brush (36) to move up and down to clean the surface of the filter plate (17). The cleaned impurities fall downward into the collection box (35) under the action of gravity. When the pipeline stops working, the collection box (35) is opened to discharge the impurities; S5 buffering, when a sudden increase in pressure such as a water hammer effect occurs during the medium conveying process, the impact force of the medium acts on the filter plate (17), and the filter plate (17) moves rapidly under the action of the impact force, driving the main guide limit rod (22) to move rapidly into the main movable groove (18). At this time, the intermediate gear rotates rapidly at the same time, causing the rotating block (31) connected to it through the rotating shaft to rotate rapidly, and the friction block (33) overcomes the elastic force of the tension spring (34) and is thrown out of the radial groove (32) and contacts the friction layer (30). The friction block (33) rubs against the friction layer (30) and converts the impact force into heat energy consumption.

Images