Low opening and closing torque flat gate valve with rising and non-rising stems

Abstract

The present invention discloses a low opening and closing torque flat gate valve for both open and closed rods, and relates to the technical field of flat gate valves. The present invention comprises a valve body, a top cover is fixedly connected to the top of the valve body, a gate plate is slidably connected to the valve body, a lifting rod is fixedly installed on the top of the gate plate, and the lifting rod slides through the top cover; two threaded rods are rotatably connected to the top of the top cover, sleeves are threadedly connected to the circumference of the two threaded rods, a connecting plate is fixedly connected between the tops of the two sleeves, a penetrating internal threaded sleeve is rotatably connected to the surface of the connecting plate, and the lifting rod thread penetrates the internal threaded sleeve; a driving mechanism is arranged on the top of the top cover to drive the threaded rod to rotate. In the present invention, during the use of the valve body, its gate plate can be opened and closed in different ways according to the use requirements, thereby improving the flexibility of use, and at the same time, the plug can be pushed to move by the rubber swelling with rainwater, and the plug drives the warning rod to extend, thereby reminding the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of flat gate valves, and in particular relates to a flat gate valve with a rising stem and a concealed stem for dual use and low opening and closing torque. Background Art

[0002] The flat gate valve is a fluid control device whose closing part is a parallel gate, which can be a single gate or a double gate with a propping mechanism. It can be divided into manual, pneumatic and electric types according to the driving mode, and is widely used in industries such as petroleum, natural gas, chemical industry, environmental protection, urban pipelines and electricity. The flat gate valve has the characteristics of good sealing performance, easy opening and closing, strong adaptability and easy maintenance. It adopts a floating valve seat and O-ring sealing structure to ensure two-way sealing; the channel is smooth and the flow resistance is small when fully open; when closed, it can automatically unload the high pressure in the inner cavity to ensure safety. The fully enclosed structure and diverse material selection of the flat gate valve enable it to adapt to all-weather and various working conditions.

[0003] Existing flat gate valves are divided into rising stem and non-rising stem according to different use conditions, but the rising stem and non-rising stem cannot be used together, the operation mode is single and lacks flexibility. Therefore, a low opening and closing torque flat gate valve with both rising stem and non-rising stem is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide a low opening and closing torque flat gate valve with both an open and concealed stem. During the use of the valve body, the gate plate can be opened and closed in different ways according to the use requirements, thereby improving the flexibility of use. At the same time, the rubber can be expanded by rainwater to push the plug to move, and the plug can drive the warning rod to extend, thereby reminding the staff, thereby solving the existing technical problems.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: A low opening and closing torque flat gate valve with both rising and falling stems, comprising: a valve body, a top cover fixedly connected to the top of the valve body, a gate plate slidably connected in the valve body, a lifting rod fixedly installed on the top of the gate plate, and the lifting rod slidingly passing through the top cover; The top of the top cover is rotatably connected to two threaded rods, the circumferences of the two threaded rods are threadedly connected to sleeves, a connecting plate is fixedly connected between the tops of the two sleeves, and the surface of the connecting plate is rotatably connected to a penetrating internal threaded sleeve, and the lifting rod thread penetrates the internal threaded sleeve, and the internal threaded sleeve can be rotated and raised, so that during the use of the valve body, its gate can be opened and closed in different ways according to the use requirements, thereby improving the flexibility of use; A driving mechanism is arranged on the top of the top cover and is used to drive the threaded rod to rotate.

[0006] Furthermore, the driving mechanism includes a protective shell and two worm gears. The protective shell is fixed on the top of the top cover. Worms are rotatably connected on both sides of the protective shell. The two worm gears are respectively fixed on the circumference of two threaded rods, and adjacent worm gears are meshed with the worms.

[0007] Furthermore, one side of the protective shell is rotatably connected to a penetrating driving rod, one end of the driving rod and one end of the worm are fixedly connected to bevel gears, and the three bevel gears are meshed.

[0008] Furthermore, the circumferential sliding sleeve of the driving rod is provided with a sliding sleeve, one side of the sliding sleeve is threadedly connected with a penetrating top screw, and the top screw is in conflict with the driving rod.

[0009] Furthermore, one side inner wall of the protective shell is provided with two positioning mechanisms for positioning the threaded rod, the positioning mechanism includes a guide cylinder and a positioning ring, the guide cylinder is fixed to one side inner wall of the protective shell, a slider is slidably connected in the guide cylinder, a first spring is fixedly connected between the slider and the guide cylinder, one side of the slider is fixedly connected to a sliding rod, one end of the sliding rod is fixedly connected to a positioning block, the positioning ring is fixed to the circumference of the threaded rod, and the circumference of the positioning ring is provided with a plurality of slots used in conjunction with the positioning blocks. Through the setting of the positioning mechanism, when the gate plate is controlled by the internal threaded sleeve, the rotation of the threaded rod can be controlled by the positioning block and the positioning groove, thereby preventing unclear gate switch caused by alternating use.

[0010] Furthermore, the positioning mechanism also includes a driving assembly, which includes a connecting frame and a pressure plate. The connecting frame is fixed between two sliders. The connecting frame is circumferentially rotated and connected to a toggle frame that is inclined. A torsion spring is fixedly installed between the toggle frame and the connecting frame. The pressure plate is fixed to the circumference of the lifting rod and is used in conjunction with the toggle frame. A pull rod is fixedly connected to one side of the connecting frame, and the pull rod slides through the protective shell.

[0011] Furthermore, one side of the protective shell is also provided with an alarm mechanism for detecting leakage, the alarm mechanism includes a connecting pipe, the connecting pipe is fixedly connected to one side of the protective shell, the bottom of the connecting pipe is fixedly connected to a mounting pipe, one end of the mounting pipe is open and slidably connected to a plug inside, one side of the plug is fixedly connected to a warning rod, a second spring is fixedly connected between the plug and the mounting pipe, water-swellable rubber is provided in the mounting pipe, and through the setting of the alarm mechanism, when leakage occurs between the top cover and the lifting rod, the rubber that expands when exposed to rainwater can push the plug to move, and the plug drives the warning rod to extend, thereby reminding the staff.

[0012] Furthermore, an induction switch is fixedly connected to an inner wall of one side of the installation tube, and an alarm is fixedly connected to an outer wall of the installation tube, and the alarm is electrically connected to the induction switch.

[0013] Furthermore, a hand wheel is fixedly connected to the circumference of the internal threaded sleeve.

[0014] The embodiments of the present invention have the following beneficial effects: In the present invention, the internal threaded sleeve is capable of rotating and rising, so that during the use of the valve body, the gate plate can be opened and closed in different ways according to the use requirements, thereby improving the flexibility of use.

[0015] In the present invention, by setting the positioning mechanism, when the gate is controlled by the internal threaded sleeve, the rotation of the threaded rod can be controlled by the positioning block and the positioning groove, thereby preventing unclear gate opening and closing caused by alternating use.

[0016] In the present invention, by setting the alarm mechanism, when leakage occurs between the top cover and the lifting rod, the rubber that expands due to rainwater can push the plug to move, and the plug drives the warning rod to extend, thereby reminding the staff.

[0017] In the present invention, during the use of the valve body, the gate plate can be opened and closed in different ways according to the use requirements, thereby improving the flexibility of use. At the same time, the plug can be pushed to move by the rubber expanded by rainwater, and the plug drives the warning rod to extend, thereby reminding the staff.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a three-dimensional structure of a first viewing angle according to an embodiment of the present invention; Figure 2 A schematic diagram of a three-dimensional structure of a second viewing angle according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a cross-sectional structure of an embodiment of the present invention from a first viewing angle; Figure 4 A schematic diagram of a cross-sectional structure of an embodiment of the present invention from a second viewing angle; Figure 5 This is a schematic diagram of the installation structure of the positioning mechanism according to one embodiment of the present invention; Figure 6 This is a schematic diagram of the installation structure of an alarm mechanism according to an embodiment of the present invention.

[0021] In the figure: 1. valve body; 2. top cover; 3. protective shell; 4. hand wheel; 5. lifting rod; 6. gate; 7. threaded rod; 8. sleeve; 9. connecting plate; 10. internal threaded sleeve; 11. worm gear; 12. alarm mechanism; 13. positioning mechanism; 14. pressure plate; 15. guide cylinder; 16. slider; 17. first spring; 18. slide rod; 19. positioning block; 20. positioning ring; 21. connecting frame; 22. toggle frame; 23. torsion spring; 24. worm; 25. bevel gear; 26. drive rod; 27. sliding sleeve; 28. top screw; 29. ​​mounting tube; 30. connecting tube; 31. water-swelling rubber; 32. plug; 33. warning rod; 34. second spring; 35. induction switch; 36. alarm; 37. pull rod. DETAILED DESCRIPTION

[0022] 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.

[0023] In the description of the present invention, it should be understood that the terms "opening", "upper", "middle", "length", "inside" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0025] Embodiment 1 See also Figure 1-Figure 6 As shown, in this embodiment, a low opening and closing torque flat gate valve with both an open stem and a concealed stem is provided, comprising: a valve body 1, a top cover 2 is fixedly connected to the top of the valve body 1, a gate plate 6 is slidably connected inside the valve body 1, the gate plate 6 is a flat plate, a lifting rod 5 is fixedly installed on the top of the gate plate 6, the lifting rod 5 slides through the top cover 2, the lifting rod 5 moves upward, and then the gate plate 6 moves upward, so that the gate plate 6 can be closed; The top of the top cover 2 is rotatably connected to two threaded rods 7, and the circumferences of the two threaded rods 7 are threadedly connected to sleeves 8. A connecting plate 9 is fixedly connected between the tops of the two sleeves 8. The surface of the connecting plate 9 is rotatably connected to a penetrating internal thread sleeve 10. The lifting rod 5 is threadedly penetrated through the internal thread sleeve 10. Rotating the internal thread sleeve 10 can move the lifting rod 5 upward. Through the control of the two driving ends of the internal thread sleeve 10 and the driving rod 26, the valve body 1 is more flexible when opening and closing, and is convenient to use; The driving mechanism is arranged on the top of the top cover 2 to drive the threaded rod 7 to rotate. Embodiment 2 Improved on the basis of embodiment 1: Refer to attached Figure 1-Figure 6 The driving mechanism includes a protective shell 3 and two worm gears 11. The protective shell 3 is fixed on the top of the top cover 2. Both sides of the protective shell 3 are rotatably connected with worms 24. The two worm gears 11 are respectively fixed on the circumference of two threaded rods 7. Adjacent worm gears 11 are meshed with worms 24. The worm 24 drives the threaded rod 7 to rotate through the worm gears 11. When the threaded rod 7 rotates, the sleeve 8 moves upward, and the sleeve 8 drives the connecting plate 9, the internal threaded sleeve 10 and the lifting rod 5 to move upward, thereby causing the gate 6 to move upward.

[0026] In the present invention, one side of the protective shell 3 is rotatably connected with a penetrating drive rod 26, one end of the drive rod 26 and one end of the worm 24 are fixedly connected with a bevel gear 25, the three bevel gears 25 are meshed, and the drive rod 26 is driven to rotate by rotating the sleeve 27, and the drive rod 26 drives the worm 24 to rotate through the bevel gear 25.

[0027] In particular, the circumferential sliding sleeve of the driving rod 26 is provided with a sliding sleeve 27, and one side of the sliding sleeve 27 is threadedly connected with a penetrating top screw 28, which contacts the driving rod 26. The setting of the sliding sleeve 27 can extend the length of the driving rod 26, thereby facilitating operation.

[0028] It should be noted that two positioning mechanisms 13 for positioning the threaded rod 7 are provided on the inner wall of one side of the protective shell 3. The positioning mechanism 13 includes a guide cylinder 15 and a positioning ring 20. The guide cylinder 15 is fixed to the inner wall of one side of the protective shell 3. A slider 16 is slidably connected in the guide cylinder 15. A first spring 17 is fixedly connected between the slider 16 and the guide cylinder 15. A slide rod 18 is fixedly connected to one side of the slider 16. A positioning block 19 is fixedly connected to one end of the slide rod 18. The positioning ring 20 is fixed to the circumference of the threaded rod 7. A plurality of slots for use with the positioning blocks 19 are provided on the circumference of the positioning ring 20. After the positioning blocks 19 are inserted into the slots, the rotation of the threaded rod 7 can be limited.

[0029] In the present invention, the positioning mechanism 13 also includes a driving component, which includes a connecting frame 21 and a pressure plate 14. The connecting frame 21 is fixed between the two sliders 16. The connecting frame 21 is circumferentially rotated and connected to a tilted toggle frame 22. A torsion spring 23 is fixedly installed between the toggle frame 22 and the connecting frame 21. The pressure plate 14 is fixed to the circumference of the lifting rod 5 and is used in conjunction with the toggle frame 22. After the lifting rod 5 rises, the slider 16 drives the slide bar 18 to move under the action of the first spring 17. The slide bar 18 drives the positioning block 19 to be inserted into the slot of the positioning ring 20, thereby positioning the threaded rod 7 to prevent the threaded rod 7 from rotating and avoiding cross operation. A pull rod 37 is fixedly connected to one side of the connecting frame 21. The pull rod 37 slides through the protective shell 3 and can be manually controlled by the pull rod 37 to release the restriction on the threaded rod 7.

[0030] In particular, one side of the protective shell 3 is also provided with an alarm mechanism 12 for detecting liquid leakage, the alarm mechanism 12 includes a connecting tube 30, the connecting tube 30 is fixedly connected to one side of the protective shell 3, the bottom of the connecting tube 30 is fixedly connected to a mounting tube 29, one end of the mounting tube 29 is open and slidably connected to a plug 32 inside, one side of the plug 32 is fixedly connected to a warning rod 33, a second spring 34 is fixedly connected between the plug 32 and the mounting tube 29, a water-swellable rubber 31 is provided in the mounting tube 29, when leakage occurs between the lifting rod 5 and the top cover 2, the leaked liquid enters the mounting tube 29 along the connecting tube 30, when the water therein is absorbed by the water-swellable rubber 31, the water-swellable rubber 31 expands, and then can push the plug 32 to move, the plug 32 drives the warning rod 33 to extend, and then reminds the staff.

[0031] It should be noted that an induction switch 35 is fixedly connected to the inner wall of one side of the mounting tube 29, and an alarm 36 is fixedly connected to the outer wall of the mounting tube 29. The alarm 36 is electrically connected to the induction switch 35. When the plug 32 contacts the induction switch 35, the alarm 36 can also sound, which can further provide an alarm effect.

[0032] In the present invention, a hand wheel 4 is fixedly connected to the circumference of the internal thread sleeve 10 , and the hand wheel 4 is convenient for people to rotate the internal thread sleeve 10 .

[0033] The use process and working principle of the technical solution of the present invention are as follows: When in use, the valve body 1 is connected to the pipeline. When the gate 6 needs to be raised, the internal threaded sleeve 10 can be rotated by the hand wheel 4, and the internal threaded sleeve 10 drives the lifting rod 5 to move upward, thereby making the gate 6 move upward. Reversing the internal threaded sleeve 10 can make the gate 6 move downward. After the gate 6 is lowered into place, the driving rod 26 can be driven to rotate by rotating the sliding sleeve 27. The driving rod 26 drives the worm 24 to rotate through the bevel gear 25. The worm 24 drives the threaded rod 7 to rotate through the worm wheel 11. When the threaded rod 7 rotates, the sleeve 8 moves upward, and the sleeve 8 drives the connecting plate 9, the internal threaded sleeve 10 and the lifting rod 5 to move upward. The rod 5 moves upward, thereby causing the gate plate 6 to move upward. Through the control of the two driving ends of the internal threaded sleeve 10 and the driving rod 26, the valve body 1 is more flexible when opening and closing. After the lifting rod 5 rises, the slider 16 drives the sliding rod 18 to move under the action of the first spring 17, and the sliding rod 18 drives the positioning block 19 to insert into the card groove of the positioning ring 20, thereby positioning the threaded rod 7 to prevent the threaded rod 7 from rotating. After the lifting rod 5 is lowered into place, the threaded rod 7 can be rotated, thereby improving the safety of use. When the internal threaded sleeve 10 rotates abnormally, the restriction on the threaded rod 7 can be released by manually pulling the pull rod 37; When leakage occurs between the lifting rod 5 and the top cover 2, the leaked liquid enters the installation tube 29 along the connecting tube 30. When the moisture therein is absorbed by the water-swellable rubber 31, the water-swellable rubber 31 expands, thereby pushing the plug 32 to move. The plug 32 drives the warning rod 33 to extend, thereby reminding the staff. When the plug 32 contacts the sensor switch 35, the alarm 36 can also be sounded, which can further have an alarm effect.

[0034] It should be noted that, in the description of this specification, descriptions such as "first", "second", etc. are merely used to distinguish between various features and have no actual order or directional meaning, and this application is not limited to this.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. Low opening and closing torque flat gate valve with rising and non-rising stems, characterized by: include: A valve body (1), the top of the valve body (1) is fixedly connected to a top cover (2), a gate plate (6) is slidably connected inside the valve body (1), a lifting rod (5) is fixedly installed on the top of the gate plate (6), and the lifting rod (5) slidably penetrates the top cover (2); The top of the top cover (2) is rotatably connected to two threaded rods (7), the circumferences of the two threaded rods (7) are threadedly connected to sleeves (8), a connecting plate (9) is fixedly connected between the tops of the two sleeves (8), the surface of the connecting plate (9) is rotatably connected to a penetrating internal threaded sleeve (10), and the lifting rod (5) is threadedly penetrated through the internal threaded sleeve (10); A driving mechanism, wherein the driving mechanism is arranged on the top of the top cover (2) and is used for driving the threaded rod (7) to rotate.

2. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 1, characterized in that: The driving mechanism comprises a protective shell (3) and two worm wheels (11); the protective shell (3) is fixed to the top of the top cover (2); both sides of the protective shell (3) are rotatably connected to worms (24); the two worm wheels (11) are respectively fixed to the circumference of two threaded rods (7); adjacent worm wheels (11) are meshed with the worms (24).

3. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 2, characterized in that: One side of the protective shell (3) is rotatably connected to a driving rod (26) that penetrates through it, and one end of the driving rod (26) and one end of the worm (24) are both fixedly connected to a bevel gear (25), and the three bevel gears (25) are meshed.

4. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 3, characterized in that: The circumferential sliding sleeve of the driving rod (26) is provided with a sliding sleeve (27), and a through-threaded top screw (28) is threadedly connected to one side of the sliding sleeve (27), and the top screw (28) is in contact with the driving rod (26).

5. The open-rod and concealed-rod dual-purpose low opening and closing torque flat gate valve according to claim 2, characterized in that: Two positioning mechanisms (13) for positioning the threaded rod (7) are arranged on an inner wall of one side of the protective shell (3). The positioning mechanism (13) comprises a guide cylinder (15) and a positioning ring (20). The guide cylinder (15) is fixed to an inner wall of one side of the protective shell (3). A slider (16) is slidably connected inside the guide cylinder (15). A first spring (17) is fixedly connected between the slider (16) and the guide cylinder (15). A slide rod (18) is fixedly connected to one side of the slide rod (16). A positioning block (19) is fixedly connected to one end of the slide rod (18). The positioning ring (20) is fixed to the circumference of the threaded rod (7). A plurality of slots for use with the positioning block (19) are provided on the circumference of the positioning ring (20).

6. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 5, characterized in that: The positioning mechanism (13) further comprises a driving assembly, the driving assembly comprising a connecting frame (21) and a pressure plate (14), the connecting frame (21) being fixed between two sliders (16), the connecting frame (21) being connected to a tilting frame (22) in a circumferentially rotatable manner, a torsion spring (23) being fixedly installed between the torsion frame (22) and the connecting frame (21), the pressure plate (14) being fixed to the circumference of the lifting rod (5) and being used in conjunction with the torsion frame (22), a pull rod (37) being fixedly connected to one side of the connecting frame (21), the pull rod (37) slidingly passing through the protective shell (3).

7. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 2, characterized in that: An alarm mechanism (12) for detecting liquid leakage is also provided on one side of the protective shell (3). The alarm mechanism (12) comprises a connecting pipe (30). The connecting pipe (30) is fixedly connected to one side of the protective shell (3). The bottom of the connecting pipe (30) is fixedly connected to a mounting pipe (29). One end of the mounting pipe (29) is open and a plug (32) is slidably connected inside. A warning rod (33) is fixedly connected to one side of the plug (32). A second spring (34) is fixedly connected between the plug (32) and the mounting pipe (29). Water-swellable rubber (31) is provided inside the mounting pipe (29).

8. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 7, characterized in that: An induction switch (35) is fixedly connected to an inner wall of one side of the mounting tube (29), and an alarm (36) is fixedly connected to an outer wall of the mounting tube (29); the alarm (36) is electrically connected to the induction switch (35).

9. The open-stem and concealed-stem dual-purpose low opening and closing torque flat gate valve according to claim 1, characterized in that: A hand wheel (4) is fixedly connected to the circumference of the internal thread sleeve (10).

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