A gate valve that can prevent the sealing surface from being scratched during opening and closing

Abstract

The present invention discloses a gate valve that can prevent the sealing surface from being scratched during opening and closing, which includes a valve housing, a valve core and a valve cover. A valve cavity is provided inside the valve housing, and connecting pipes communicating with the valve cavity are fixed on the left and right sides of the valve housing. A gate plate is slidably connected inside the valve cavity, and through holes are provided on the lower side of the gate plate. Grooves are provided on the left and right sides of the upper end of the gate plate, and a valve core is spline-connected inside the grooves. For this gate valve that can prevent the sealing surface from being scratched during opening and closing, grooves, a valve core and bevel gears are provided. When the gate plate moves to the lowermost side, the center line of the valve core coincides with the center line of the connecting pipe. By rotating the handwheel, the rotating shaft is driven to rotate successively through the gear ring, connecting gears, connecting cylinder, connecting rod, second bevel gear and first bevel gear. The rotating shaft pushes the valve core to slide along the groove until the valve core fits against the inner wall of the valve cavity outside the connecting pipe. Through the above sealing structure, friction of the sealing door during the movement of the valve core is avoided, and the service life of this gate valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, in particular to a gate valve capable of preventing a sealing surface from being scratched during opening and closing. Background Art

[0002] Valves are control components in fluid delivery systems and have functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, diversion or overflow pressure relief. Among them, gate valves have the characteristics of allowing the medium to flow in either direction on both sides, easy installation, and not prone to water hammer.

[0003] When the existing gate valve is fully opened, the valve core and the valve cavity for accommodating the valve core make the internal flatness of the gate valve not high, which in turn leads to an increase in the flow resistance of the medium. The gate valve is not effective in use. When the existing gate valve is opened and closed, the sealing surface of the valve core and the valve cavity is prone to friction. After long-term use, the sealing surface of the valve core and the valve cavity is prone to friction and damage, affecting the sealing effect of the gate valve. In addition, the bottom of the valve core of the existing gate valve is usually not provided with a supporting structure. When opening and closing, the medium directly impacts the bottom of the valve core. If the bottom of the valve core is impacted by the medium for a long time, it is easy to deform. Therefore, the existing gate valve is difficult to use as a control component for regulating flow, and has certain limitations in use. In view of the above problems, it is necessary to improve the existing equipment. Summary of the invention

[0004] The object of the present invention is to provide a gate valve which can prevent the sealing surface from being scratched during opening and closing, so as to solve the problem proposed in the above background technology that when the existing gate valve is fully opened, its valve core and the valve cavity for accommodating the valve core make the internal flatness of the gate valve not high, which in turn leads to increased resistance to medium flow, and the gate valve is not effective in use. When the existing gate valve is opened and closed, the sealing surface of the valve core and the valve cavity are prone to friction. After long-term use, the sealing surface of the valve core and the valve cavity are prone to friction and damage, affecting the sealing effect of the gate valve. In addition, the bottom of the valve core of the existing gate valve is usually not provided with a supporting structure. When opening and closing, the medium directly impacts the bottom of the valve core. If the bottom of the valve core is easily deformed by the impact of the medium for a long time, the existing gate valve is difficult to use as a control component for regulating flow and has certain limitations in use.

[0005] To achieve the above object, the present invention provides the following technical solution: a gate valve capable of preventing the sealing surface from being scratched during opening and closing, comprising a valve housing, a valve core and a valve cover,

[0006] A valve cavity is provided inside the valve housing, and connecting pipes connected to the valve cavity are fixed on the left and right sides of the valve housing, a gate is slidably connected inside the valve cavity, and a through hole is provided on the lower side of the gate, grooves are provided on the left and right sides of the upper end of the gate, and a valve core is splined inside the groove, a sealing gasket is fixed on the side of the valve core away from the gate, and a rotating shaft is threadedly connected on the side of the valve core close to the gate, the side of the rotating shaft away from the valve core penetrates the gate and is rotatably connected to the gate, and a first bevel gear is fixed on the end of the rotating shaft away from the valve core, the first bevel gear is arranged inside the first gear groove, and the first gear groove is provided inside the gate, and the first bevel gear is meshedly connected with the second bevel gear on both the upper and lower sides, a sliding hole is provided inside the upper side of the gate, and a connecting cylinder is slidably connected inside the sliding hole, a connecting rod is splined inside the connecting cylinder, and the lower end of the connecting rod penetrates the bottom of the sliding hole and is rotatably connected to the gate;

[0007] The front and rear sides of the gate plate are both threadedly connected with screws, and the lower end of the screw is rotatably connected to the lower side of the valve housing, while the upper side of the screw penetrates the upper side of the valve housing and is rotatably connected to the valve housing, the upper side of the connecting tube penetrates the upper side of the valve housing and is rotatably connected to the valve housing, a plurality of blind holes are provided at the top of the valve housing, and the blind holes are filled with sealing fillers, the upper end of the screw and the upper end of the connecting tube respectively penetrate the sealing fillers inside the blind holes, a valve cover is fixedly installed at the top of the valve housing, and a second gear groove is provided inside the valve cover, a driving gear is rotatably connected to the middle of the second gear groove, and a gear set is rotatably connected to the front and rear sides of the second gear groove, the upper ends of the two screws respectively penetrate the front and rear sides of the valve cover and are connected to the driving gear through the gear set, the upper end of the connecting tube penetrates the middle of the valve cover and the center of the driving gear and is fixedly connected to the connecting gear, a hand wheel is slidably installed on the top of the valve cover, and a slide groove is provided at the lower end of the hand wheel, and a gear ring is installed at the lower side of the slide groove, the upper side of the driving gear and the connecting gear are both slidably installed inside the slide groove, and the upper side of the driving gear is meshed with the gear ring.

[0008] Preferably, the distance between the lowermost end of the gate plate and the lowermost end of the valve cavity is equal to the distance between the center line of the valve core and the center line of the through hole.

[0009] Preferably, both sides of the front and rear ends of the gate plate are slidably connected to the valve cavity, and a certain gap is left between the left and right ends of the gate plate and the inner wall of the valve cavity.

[0010] Preferably, the inner diameter of the through hole is the same as that of the connecting pipe, and the inner diameter of the through hole is smaller than the outer diameter of the valve core, and the center line of the through hole coincides with the center line of the connecting pipe.

[0011] Preferably, two valve cores are provided, and the two valve cores are symmetrically arranged with the center line of the gate plate as the center.

[0012] Preferably, the distance that the valve core slides in the groove is greater than the distance between the end of the valve core away from the gate plate and the inner wall of the valve cavity.

[0013] Preferably, the lower side of the connecting rod is fixedly connected to the second bevel gear on the upper side of the first bevel gear, and the lower side of the connecting rod is rotatably connected to the second bevel gear on the lower side of the first bevel gear.

[0014] Preferably, the length of the spline connection between the connecting rod and the connecting cylinder is greater than the sliding distance of the gate plate in the valve cavity.

[0015] Preferably, the outer diameter of the upper side of the driving gear is the same as the outer diameter of the connecting gear, and the center line of the driving gear coincides with the center line of the connecting gear.

[0016] Compared with the prior art, the invention has the following beneficial effects: the gate valve can prevent the sealing surface from being scratched during opening and closing.

[0017] (1) A gate plate, a valve cavity, and a through hole are provided. The gaps between the left and right ends of the gate plate and the inner wall of the valve cavity are small, and the inner diameter of the through hole is the same as the inner diameter of the connecting pipe. At the same time, the center line of the connecting pipe coincides with the center line of the connecting pipe. Through the above structure, the interior of the gate valve is relatively flat, and the resistance encountered by the medium when flowing through the connecting pipe and the through hole is small, thereby improving the use effect of the gate valve;

[0018] (2) A gate, a screw and a valve chamber are provided. When the hand wheel is turned, the hand wheel drives the driving gear to rotate through the gear ring, and the driving gear drives the screw to rotate through the gear set. The screw pushes the gate to slide along the valve chamber, and the through hole moves downward at the same time, so that the internal flow cut-off area of ​​the gate valve becomes smaller. At this time, the screw and the valve chamber support the gate at the same time to prevent the gate from being deformed by the flow pressure of the medium. The gate valve can adjust the medium flow, increase the use range of the gate valve, and is more practical to use;

[0019] (3) A groove, a valve core and a bevel gear are provided. When the gate moves to the lowermost side, the center line of the valve core coincides with the center line of the connecting pipe. By turning the hand wheel, the rotating shaft is driven to rotate through the gear ring, the connecting gear, the connecting tube, the connecting rod, the second bevel gear and the first bevel gear in sequence. The rotating shaft pushes the valve core to slide along the groove until the valve core fits against the inner wall of the valve cavity outside the connecting pipe. The sealing gasket fixed on the surface of the valve core further improves the sealing effect. Through the above-mentioned sealing structure, friction of the sealing door is avoided when the valve core moves, thereby extending the adaptability life of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the left side of the present invention;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the gate plate of the present invention from top view;

[0023] Figure 4 It is a schematic diagram of a top-view cross-sectional structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the valve cover of the present invention from top view;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the connecting tube of the present invention from top view;

[0026] Figure 7 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0027] Figure 8 For the present invention Figure 2 The enlarged structural diagram at B in the middle;

[0028] Fig. 9 It is a schematic diagram of the main cross-sectional structure of the present invention in a closed state.

[0029] In the figure: 1, valve housing, 2, valve chamber, 3, connecting pipe, 4, gate, 5, through hole, 6, groove, 7, valve core, 8, sealing gasket, 9, rotating shaft, 10, first bevel gear, 11, first gear groove, 12, second bevel gear, 13, sliding hole, 14, connecting cylinder, 15, connecting rod, 16, screw, 17, blind hole, 18, sealing packing, 19, valve cover, 20, second gear groove, 21, driving gear, 22, gear set, 23, connecting gear, 24, handwheel, 25, slide groove, 26, gear ring. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1-9 The present invention provides a technical solution: a gate valve that can prevent the sealing surface from being scratched during opening and closing, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7As shown, a valve cavity 2 is provided inside the valve housing 1, and connecting pipes 3 connected to the valve cavity 2 are fixed on the left and right sides of the valve housing 1, a gate plate 4 is slidably connected inside the valve cavity 2, and a through hole 5 is provided on the lower side of the gate plate 4, the distance between the lowermost end of the gate plate 4 and the lowermost end of the valve cavity 2 is equal to the distance between the center line of the valve core 7 and the center line of the through hole 5, so that when the gate plate 4 slides to the lowermost end of the valve cavity 2, the center line of the valve core 7 coincides with the center line of the connecting pipe 3, the front and rear ends of the gate plate 4 are slidably connected to the valve cavity 2, and a certain gap is left between the left and right ends of the gate plate 4 and the inner wall of the valve cavity 2 to avoid direct contact between the left and right ends of the gate plate 4 and the inner wall of the valve cavity 2, thereby protecting the sealing surface of the inner wall of the valve cavity 2, and the inner diameter of the through hole 5 is the same as that of the connecting pipe 3. The inner diameters are the same, and the inner diameter of the through hole 5 is smaller than the outer diameter of the valve core 7. At the same time, the center line of the through hole 5 coincides with the center line of the connecting pipe 3, so as to prevent the medium from flowing in the connecting pipe 3 and the through hole 5 and reduce the resistance encountered by the medium when flowing. Grooves 6 are provided on the left and right sides of the upper end of the gate plate 4, and the valve core 7 is splined inside the groove 6. Two valve cores 7 are provided, and the two valve cores 7 are symmetrically arranged with the center line of the gate plate 4 as the center. The sliding distance of the valve core 7 in the groove 6 is greater than the distance between the end of the valve core 7 away from the gate plate 4 and the inner wall of the valve cavity 2, so as to facilitate simultaneously pushing the two valve cores 7 to contact the inner wall of the valve cavity 2. A sealing gasket 8 is fixed on the side of the valve core 7 away from the gate plate 4, and a rotating shaft 9 is threadedly connected to the side of the valve core 7 close to the gate plate 4. The rotating shaft 9 The side away from the valve core 7 passes through the gate plate 4 and is rotatably connected to the gate plate 4, and a first bevel gear 10 is fixed to the end of the rotating shaft 9 away from the valve core 7, the first bevel gear 10 is arranged inside the first gear groove 11, and the first gear groove 11 is opened inside the gate plate 4, the first bevel gear 10 is meshed and connected with the second bevel gear 12 on both the upper and lower sides, a sliding hole 13 is opened inside the upper side of the gate plate 4, and a connecting cylinder 14 is slidably connected inside the sliding hole 13, a connecting rod 15 is splined inside the connecting cylinder 14, and the lower end of the connecting rod 15 passes through the bottom of the sliding hole 13 and is rotatably connected to the gate plate 4, and the lower side of the connecting rod 15 is connected to the second bevel gear 12 on the upper side of the first bevel gear 10 The gear 12 is fixedly connected, and the lower side of the connecting rod 15 is rotationally connected to the second bevel gear 12 on the lower side of the first bevel gear 10. The two second bevel gears 12 simultaneously support the first bevel gear 10, so that the rotation of the first bevel gear 10 is more stable. The spline connection length between the connecting rod 15 and the connecting tube 14 is greater than the sliding distance of the gate 4 in the valve cavity 2, so that when the gate 4 slides to the lower end of the valve cavity 2, the connecting rod 15 and the connecting tube 14 maintain a spline connection. The gate 4 is threadedly connected with a screw 16 on both the front and rear sides, and the lower end of the screw 16 is rotationally connected to the lower side of the valve housing 1, and the upper side of the screw 16 passes through the upper side of the valve housing 1 and is rotationally connected to the valve housing 1.

[0032] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8 and Fig. 9As shown, the upper side of the connecting cylinder 14 passes through the upper side of the valve housing 1 and is rotatably connected to the valve housing 1. A plurality of blind holes 17 are provided on the top of the valve housing 1, and the blind holes 17 are filled with sealing packings 18. The upper ends of the screw rods 16 and the upper ends of the connecting cylinder 14 respectively pass through the sealing packings 18 inside the blind holes 17. A valve cover 19 is fixedly installed on the top of the valve housing 1, and a second gear groove 20 is provided inside the valve cover 19. A driving gear 21 is rotatably connected to the middle of the second gear groove 20, and a gear set 22 is rotatably connected to the front and rear sides of the second gear groove 20. The outer diameter of the upper side of the driving gear 21 is the same as the outer diameter of the connecting gear 23, and the center line of the driving gear 21 coincides with the center line of the connecting gear 23. The handwheel 24 is pulled up and down so that the handwheel 24 is meshed and connected with the upper side of the driving gear 21 or the connecting gear 23 through the gear ring 26. The upper ends of the two screws 16 respectively penetrate the front and rear sides of the valve cover 19 and are connected with the driving gear 21 through the gear set 22. The upper end of the connecting cylinder 14 penetrates the middle part of the valve cover 19 and the center of the driving gear 21 and is fixedly connected with the connecting gear 23. The handwheel 24 is slidably installed on the top of the valve cover 19, and a slide groove 25 is opened at the lower end of the handwheel 24. At the same time, a gear ring 26 is installed on the lower side of the slide groove 25. The upper side of the driving gear 21 and the connecting gear 23 are both slidably installed in the slide groove 25, and the upper side of the driving gear 21 is meshed and connected with the gear ring 26.

[0033] Working principle: When using the gate valve that can prevent the sealing surface from being scratched during opening and closing, first install the gate valve on the pipeline, and the medium in the pipeline flows through the connecting pipe 3 and the through hole 5. Since the gap between the gate plate 4 and the inner wall of the valve cavity 2 is small, and the inner diameter of the through hole 5 is the same as the inner diameter of the connecting pipe 3, the inside of the gate valve is smoother, reducing the resistance of the medium flowing through the gate valve, and improving the use effect of the gate valve. Press the hand wheel 24 downward, the hand wheel 24 is meshed with the driving gear 21 through the gear ring 26, and the hand wheel 24 is turned. The hand wheel 24 drives the screw 16 to rotate through the gear ring 26, the driving gear 21, and the gear set 22 in turn, and the screw 16 pushes the gate plate 4 to slide downward along the valve cavity 2. Through the above operation, the intercepting area inside the gate valve is reduced, which then plays a role in adjusting the flow rate. At this time, the valve cavity 2 and the screw 16 simultaneously support the gate plate 4, improve the strength of the gate plate 4, and prevent the gate plate 4 from being affected by the medium. The gate valve is deformed by the pressure generated when the mass flows, which improves the application range of the gate valve. When the gate plate 4 slides to the lowermost end of the valve cavity 2, the hand wheel 24 is pulled upward, and the gear ring 26 is disengaged from the meshing with the upper side of the driving gear 21. At the same time, the hand wheel 24 is meshed with the connecting gear 23 through the gear ring 26. The hand wheel 24 is turned. The hand wheel 24 drives the rotating shaft 9 to rotate through the gear ring 26, the connecting cylinder 14, the connecting rod 15, the second bevel gear 12 and the first bevel gear 10 in turn. The rotating shaft 9 pushes the valve core 7 to slide along the groove 6 until the sealing gasket 8 on one side of the valve core 7 fits the inner wall of the valve cavity 2. Through the above-mentioned sealing steps, the problem of damage to the sealing surface caused by friction between the valve core 7 and the inner wall of the valve cavity 2 is avoided, and it is more practical to use. The sealing packing 18 inside the blind hole 17 strengthens the sealing effect of the gate valve, which completes all the work. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0034] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate valve capable of preventing a sealing surface from being scratched during opening and closing, comprising a valve housing (1), a valve core (7) and a valve cover (19), Features: A valve cavity (2) is provided inside the valve housing (1), and connecting pipes (3) connected to the valve cavity (2) are fixed on the left and right sides of the valve housing (1), a gate plate (4) is slidably connected inside the valve cavity (2), and a through hole (5) is provided on the lower side of the gate plate (4), grooves (6) are provided on the left and right sides of the upper end of the gate plate (4), and a valve core (7) is spline-connected inside the groove (6), a sealing gasket (8) is fixed on the side of the valve core (7) away from the gate plate (4), and a rotating shaft (9) is threadedly connected on the side of the valve core (7) close to the gate plate (4), and the rotating shaft (9) passes through the gate plate (4) on the side away from the valve core (7) and is connected to the gate plate (4). ) is rotatably connected, and a first bevel gear (10) is fixed to one end of the rotating shaft (9) away from the valve core (7), the first bevel gear (10) is arranged inside a first gear groove (11), and the first gear groove (11) is opened inside the gate plate (4), the first bevel gear (10) is meshedly connected with a second bevel gear (12) on both the upper and lower sides, a sliding hole (13) is opened inside the upper side of the gate plate (4), and a connecting tube (14) is slidably connected inside the sliding hole (13), a connecting rod (15) is splined inside the connecting tube (14), and the lower end of the connecting rod (15) passes through the bottom of the sliding hole (13) and is rotatably connected to the gate plate (4); The gate plate (4) is threadedly connected with a screw rod (16) on both the front and rear sides, and the lower end of the screw rod (16) is rotatably connected to the lower side of the valve housing (1). At the same time, the upper side of the screw rod (16) penetrates the upper side of the valve housing (1) and is rotatably connected to the valve housing (1). The upper side of the connecting tube (14) penetrates the upper side of the valve housing (1) and is rotatably connected to the valve housing (1). The top of the valve housing (1) is provided with a plurality of blind holes (17), and the blind holes (17) are filled with sealing packing (18). The upper ends of the screw rod (16) and the upper ends of the connecting tube (14) respectively penetrate the sealing packing (18) inside the blind holes (17). A valve cover (19) is fixedly installed on the top of the valve housing (1), and a second gear groove (20) is provided inside the valve cover (19). The middle part of the second gear groove (20) is rotatably connected to the valve housing (1). A driving gear (21) is provided, and a gear set (22) is rotatably connected to the front and rear sides of the second gear groove (20). The upper ends of the two screw rods (16) respectively penetrate the front and rear sides of the valve cover (19) and are connected to the driving gear (21) through the gear set (22). The upper end of the connecting cylinder (14) penetrates the middle of the valve cover (19) and the center of the driving gear (21) and is fixedly connected to the connecting gear (23). A hand wheel (24) is slidably installed on the top of the valve cover (19), and a slide groove (25) is opened at the lower end of the hand wheel (24). At the same time, a gear ring (26) is installed on the lower side of the slide groove (25). The upper side of the driving gear (21) and the connecting gear (23) are both slidably installed inside the slide groove (25), and the upper side of the driving gear (21) is meshed with the gear ring (26).

2. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The distance between the lowermost end of the gate plate (4) and the lowermost end of the valve cavity (2) is equal to the distance between the center line of the valve core (7) and the center line of the through hole (5).

3. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: Both sides of the front and rear ends of the gate plate (4) are slidably connected to the valve cavity (2), and a certain gap is left between the left and right ends of the gate plate (4) and the inner wall of the valve cavity (2).

4. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The inner diameter of the through hole (5) is the same as that of the connecting pipe (3), and the inner diameter of the through hole (5) is smaller than the outer diameter of the valve core (7), while the center line of the through hole (5) coincides with the center line of the connecting pipe (3).

5. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: Two valve cores (7) are provided, and the two valve cores (7) are symmetrically arranged with the center line of the gate plate (4) as the center.

6. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The sliding distance of the valve core (7) in the groove (6) is greater than the distance between the end of the valve core (7) away from the gate plate (4) and the inner wall of the valve cavity (2).

7. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The lower side of the connecting rod (15) is fixedly connected to the second bevel gear (12) on the upper side of the first bevel gear (10), and the lower side of the connecting rod (15) is rotationally connected to the second bevel gear (12) on the lower side of the first bevel gear (10).

8. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The spline connection length between the connecting rod (15) and the connecting cylinder (14) is greater than the sliding distance of the gate plate (4) in the valve cavity (2).

9. A gate valve capable of preventing the sealing surface from being scratched during opening and closing according to claim 1, Features: The outer diameter of the upper side of the driving gear (21) is the same as the outer diameter of the connecting gear (23), and the center line of the driving gear (21) coincides with the center line of the connecting gear (23).

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