Flashboard assembly and opening type flat gate valve adopting same

Abstract

The utility model discloses a flashboard assembly and an opening type flat gate valve adopting the same, which belong to the field of opening type flat valves, and comprise a main flashboard and an auxiliary flashboard, a binding surface between the main flashboard and the auxiliary flashboard is composed of two sections of inclined surfaces, and the two sections of inclined surfaces are respectively an upper inclined surface and a lower inclined surface. A connecting groove used for being connected with a valve rod is formed in the top of the main gate plate, connecting plates are arranged on the side faces of the main gate plate and the auxiliary gate plate, the two sides of the upper ends of the connecting plates are connected with the main gate plate and the auxiliary gate plate through pin shafts respectively, and the lower ends of the connecting plates are connected with the swing blocks and the auxiliary gate plate through block pin shafts. The main guide plate and the auxiliary guide plate are used for limiting the main flashboard and the auxiliary flashboard to laterally swing, the main guide plate and the auxiliary guide plate are arranged close to the outer end face of the main flashboard at the main flashboard end and the outer end face of the auxiliary flashboard at the auxiliary flashboard end respectively, and valve seat through holes are formed in the middle of the main guide plate and the middle of the auxiliary guide plate respectively. The problem that a gate plate easily swings laterally when an opening type flat gate valve operates is solved.

Description

Technical Field

[0001] The utility model relates to the field of expanding flat valves, in particular to a gate plate assembly and an expanding flat gate valve using the assembly. Background Technique

[0002] The flat valve is a key valve widely used in the control of oil, gas and industrial pipelines. It includes a single plate type and a double plate type. The core design feature of the double plate type is the use of a bidirectional expanding seal structure. The main body of the valve consists of a valve body, two parallel gate plates, valve seats and an expanding mechanism, and the flow passage is opened and closed by the vertical lifting of the gate plates.

[0003] This expanding mechanism significantly improves the sealing reliability of the valve under high-pressure and high-wear conditions. With its compact structure, small operating torque, high pressure resistance and convenient maintenance, the flat valve has become the preferred equipment for oil and gas wellhead devices, pipeline cut-off and storage and transportation systems.

[0004] In the prior art, after using the expanding flat gate valve for a period of time, it is often found that the sealing effect becomes poor. After disassembling, it is found that the gate plate will have some serious deformations, and it may further cause the deformation of the valve stem, etc. After research, it is found that the main reason for this phenomenon is that there is no corresponding limiting mechanism on the side of the gate plate. Therefore, the gate plate will have a large side swing during the up and down movement. The side swing of the gate plate will cause the contact with the valve seat sealing surface to shift, resulting in local excessive wear or gaps, destroying the integrity of the sealing line and causing medium leakage. The side swing will also cause uneven stress on the expanding mechanism, insufficient pressing force in some areas. To solve this problem, it is necessary to improve the existing expanding flat gate valve. Content of the Utility Model

[0005] The purpose of the utility model is to provide a gate plate assembly and an expanding flat gate valve using the assembly, so as to solve the problem that the gate plate of the existing expanding flat gate valve is prone to side swing during operation.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A gate plate assembly includes a main gate plate and a sub - gate plate. The fitting surface between the main gate plate and the sub - gate plate is composed of two inclined surfaces, namely the upper inclined surface and the lower inclined surface. The upper inclined surface and the lower inclined surface are symmetrically arranged with the horizontal plane as the symmetry plane. A connection groove for connecting with the valve stem is provided at the top of the main gate plate. Connecting plates are provided on the sides of the main gate plate and the sub - gate plate. The two sides of the upper end of the connecting plate are connected to the main gate plate and the sub - gate plate respectively through pin shafts, and the lower end of the connecting plate is connected to the swing block and the sub - gate plate through a block pin shaft. A limiting platform is provided on the side of the sub - gate plate opposite to the fitting surface. It also includes a main guide plate and a sub - guide plate for restricting the side swing of the main gate plate and the sub - gate plate. The main guide plate is arranged on the outer end surface of the main gate plate close to the main gate plate end, and the sub - guide plate is arranged on the outer end surface of the sub - gate plate close to the sub - gate plate end. Limiting strips are provided on both sides of the main guide plate and both sides of the sub - guide plate. Valve seat through - holes are provided in the middle of the main guide plate and the sub - guide plate.

[0008] In this solution, a main guide plate and a sub - guide plate for restricting the side swing of the main gate plate and the sub - guide plate are respectively arranged at the outer end surface close to the main gate plate and the outer end surface close to the sub - gate plate. This can effectively prevent the side swing of the main gate plate and the sub - gate plate during the up - and - down movement, effectively reduce the wear of the gate plate, reduce its deformation degree in a short time, and enable the opening - type flat gate valve to maintain a good sealing effect for a long time.

[0009] As a further preference of the present utility model, the limiting platform is detachably connected to the sub - gate plate through bolts.

[0010] It is convenient to replace the limiting platform.

[0011] As a further preference of the present utility model, the cross - section of the limiting strip is in the shape of a right - angled triangle. The two right - angled surfaces of the limiting strip are respectively a connecting surface and a limiting surface. The connecting surface is used for fixedly connecting with the inner end surface of the main guide plate or the sub - guide plate. The limiting surface of the limiting strip for limiting the main gate plate is arranged parallel to the side surface of the main gate plate, and the limiting surface of the limiting strip for limiting the sub - gate plate is arranged parallel to the side surface of the sub - gate plate.

[0012] The cross - section of the limiting strip is in the shape of a right - angled triangle, so the stability of the limit is better and it is not easy to deform.

[0013] As a further preference of the present utility model, ball structures are evenly clamped on the surface of the limiting surface of the limiting strip.

[0014] The rolling - type guiding can effectively reduce the friction force when the main gate plate and the sub - gate plate move up and down, making the resistance smaller and smoother when controlling the movement of the gate plate assembly.

[0015] As a further preference of the present utility model, sealing material replacement grooves are provided at the sealing parts of the main gate sealing surface and the secondary gate sealing surface, and sealing material blocks are detachably provided at the sealing material replacement grooves.

[0016] In this way, different sealing material blocks can be replaced according to the sealed fluid, so that the sealing parts of the main gate sealing surface and the secondary gate sealing surface are not easily corroded, and their service life can be prolonged.

[0017] As a further preference of the present utility model, diversion holes are provided at the lower parts of the main gate and the secondary gate.

[0018] An expanding flat gate valve adopting the gate plate assembly described in any one of the above items includes a valve body, a gate plate assembly, a valve cover, a bracket and a gear box. A valve seat is installed at the valve seat hole of the valve body. The gate plate assembly is arranged between two valve seats. The valve cover is arranged on the top surface of the valve body. The bracket is arranged on the top surface of the valve cover. The gear box is arranged on the top surface of the bracket. A hand wheel is installed at the front end of the gear box. The inner end of the hand wheel is connected to the top of the valve rod through a gear assembly. The valve rod is vertically arranged at the central position of the bracket. The lower end of the valve rod passes downward through the valve cover and is connected to the top of the gate plate assembly.

[0019] As a further preference of the present utility model, a packing groove is provided at the top of the valve cover. The packing groove surrounds the valve rod. A fluororubber packing layer, a graphite packing layer and a grease injection packing layer are sequentially arranged in the packing groove. A packing gland is further provided at the notch of the packing groove.

[0020] A multi-packing seal design is adopted to ensure the sealing effect. The packing gland and the valve cover are connected by bolts, and the packing gland can effectively prevent the leakage of the medium.

[0021] Compared with the prior art, the present utility model can at least achieve one of the following beneficial effects:

[0022] 1. In this solution, guide plates for restricting the lateral swing of the main gate and the secondary gate are respectively arranged at the outer end faces close to the main gate and the outer end face close to the secondary gate, so that the lateral swing of the main gate and the secondary gate during the up and down movement can be effectively prevented, the wear of the gate plate can be effectively reduced, the deformation degree within a short time can be reduced, and the better sealing effect of the expanding flat gate valve can be maintained for a long time.

[0023] 2. It is convenient to replace the limit platform.

[0024] 3. The cross section of the limit strip is a right triangle. Such a structure has better limiting stability and is not easily deformed.

[0025] 4. The rolling guide can effectively reduce the friction when the main gate and the auxiliary gate move up and down, making the resistance smaller and smoother when controlling the movement of the gate assembly.

[0026] 5. Different sealing material blocks can be replaced according to the sealed fluid, so that the sealing parts of the sealing surfaces of the main gate and the auxiliary gate are not easily corroded, and their service life can be extended.

[0027] 6. The multi-packing seal design is adopted to ensure the sealing effect. The packing gland is connected to the valve cover by bolts, and the packing gland can effectively prevent the leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a three-dimensional structural schematic diagram of the expandable flat gate valve of the present utility model.

[0029] Figure 2 is a structural schematic diagram of the gate assembly of the present utility model.

[0030] Figure 3 is a structural schematic diagram of the main guide plate or the auxiliary guide plate of the present utility model.

[0031] Figure 4 is a front view of the main gate of the present utility model.

[0032] Figure 5 is a front view of the auxiliary gate of the present utility model.

[0033] Figure 6 is a front view of the main guide plate of the present utility model.

[0034] Figure 7 is a front view of the auxiliary guide plate of the present utility model.

[0035] 1 - Main gate, 2 - Auxiliary gate, 3 - Connecting plate, 4 - Swing block, 5 - Limiting platform, 6 - Main guide plate, 7 - Auxiliary guide plate, 9 - Ball structure, 12 - Diversion hole, 13 - Valve body, 131 - Valve seat hole, 14 - Valve cover, 141 - Packing groove, 142 - Packing gland, 15 - Bracket, 16 - Gear box, 17 - Valve seat, 18 - Hand wheel, 19 - Valve stem, 20 - Valve seat through hole, 21 - Sealing material replacement groove, 22 - Sealing material block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0039] It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Specific Embodiment 1:

[0043] Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7A gate assembly is shown, which includes a main gate 1 and a sub-gate 2. The mating surface between the main gate 1 and the sub-gate 2 is composed of two inclined surfaces, namely the upper inclined surface and the lower inclined surface. The upper inclined surface and the lower inclined surface are symmetrically arranged with the horizontal plane as the symmetry plane. A connection groove for connecting with the valve stem is provided at the top of the main gate 1. Connecting plates 3 are provided on the sides of the main gate 1 and the sub-gate 2. The two sides of the upper end of the connecting plate 3 are respectively connected to the main gate 1 and the sub-gate 2 through pin shafts. The lower end of the connecting plate 3 is connected to the swing block 4 and the sub-gate 2 through a block pin shaft. A limiting platform 5 is provided on the side of the sub-gate 2 opposite to the mating surface. It also includes a main guide plate 6 and a sub-guide plate 7 for restricting the side swing of the main gate 1 and the sub-gate 2. The main guide plate 6 is arranged on the outer end surface of the main gate 1 close to the main gate end, and the sub-guide plate 7 is arranged on the outer end surface of the sub-gate 2 close to the sub-gate end. Limiting strips are provided on both sides of the main guide plate 6 and both sides of the sub-guide plate 7. Valve seat through holes 20 are provided in the middle of the main guide plate 6 and the sub-guide plate 7.

[0044] In this solution, a main guide plate and a sub-guide plate for restricting the side swing of the main gate and the sub-gate guide plate are respectively arranged at the positions close to the outer end surface of the main gate and the outer end surface of the sub-gate. In this way, it can effectively prevent the main gate and the sub-gate from swinging sideways during the up and down movement, effectively reduce the wear of the gate plate, reduce its deformation degree in a short time, and enable the open-type flat gate valve to maintain a good sealing effect for a long time. Specific Embodiment 2:

[0046] In this embodiment, the limiting platform 5 is further described on the basis of Specific Embodiment 1. The limiting platform 5 is detachably connected to the sub-gate 2 through bolts.

[0047] It is convenient to replace the limiting platform. Specific Embodiment 3:

[0049] In this embodiment, the main guide plate 6 is further described on the basis of Specific Embodiment 1. The cross-section of the limiting strip is in the shape of a right triangle. The two right-angled surfaces of the limiting strip are respectively a connecting surface and a limiting surface. The connecting surface is used for fixed connection with the inner end surface of the main guide plate 6 or the sub-guide plate 7. The limiting surface of the limiting strip for limiting the main gate 1 is arranged parallel to the side surface of the main gate. The limiting surface of the limiting strip for limiting the sub-gate 2 is arranged parallel to the side surface of the sub-gate.

[0050] The cross-section of the limiting strip is in the shape of a right triangle. Such a structure has better limiting stability and is not easy to deform. Specific Embodiment 4:

[0052] In this embodiment, the limiting strip is further described on the basis of Specific Embodiment 3. Ball structures 9 are evenly clamped on the surface of the limiting surface of the limiting strip. Specific Embodiment 5:

[0054] This embodiment further describes the main gate 1 and the auxiliary gate 2 on the basis of Specific Embodiment 1. Sealing material replacement grooves 21 are provided at the sealing parts of the sealing surfaces of the main gate 1 and the auxiliary gate 2, and sealing material blocks 22 are detachably provided at the sealing material replacement grooves 21.

[0055] In this way, different sealing material blocks can be replaced according to the sealed fluid, so that the sealing parts of the sealing surfaces of the main gate and the auxiliary gate are not easily corroded, and their service life can be extended. The sealing material blocks are connected to the sealing material replacement grooves by bolts. Specific Embodiment 6:

[0057] This embodiment further describes the main gate 1 and the auxiliary gate 2 on the basis of Specific Embodiment 1. Diversion holes 12 are provided at the lower parts of the main gate 1 and the auxiliary gate 2. Specific Embodiment 7:

[0059] An expanding flat gate valve using the gate assembly described in any one of the above, comprising a valve body 13, a gate assembly, a valve cover 14, a bracket 15 and a gearbox 16. A valve seat 17 is installed at the valve seat hole 131 of the valve body 13. The gate assembly is arranged between the two valve seats 17. The valve cover 14 is arranged on the top surface of the valve body 13. The bracket 15 is arranged on the top surface of the valve cover 14. The gearbox 16 is arranged on the top surface of the bracket 15. A handwheel 18 is installed at the front end of the gearbox 16. The inner end of the handwheel 18 is connected to the top of the valve stem 19 through a gear assembly. The valve stem 19 is vertically arranged at the central position of the bracket 15. The lower end of the valve stem 19 passes downward through the valve cover 14 and is connected to the top of the gate assembly. Specific Embodiment 8:

[0061] This embodiment further describes the valve cover 14 on the basis of Specific Embodiment 7. A packing groove 141 is provided at the top of the valve cover 14. The packing groove 141 surrounds the valve stem 19. A fluororubber packing layer, a graphite packing layer and a grease injection packing layer are sequentially provided in the packing groove 141. A packing gland 142 is also provided at the notch of the packing groove 141.

[0062] A multi-packing seal design is adopted to ensure the sealing effect. The packing gland is connected to the valve cover by bolts, and the packing gland can effectively prevent the leakage of the medium.

[0063] Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A gate assembly, comprising a main gate (1) and a secondary gate (2), the mating surface between the main gate (1) and the secondary gate (2) is composed of two inclined surfaces, namely an upper inclined surface and a lower inclined surface, the upper inclined surface and the lower inclined surface are symmetrically arranged with the horizontal plane as the symmetry plane, a connection groove for connecting with the valve stem is provided at the top of the main gate (1), a connecting plate (3) is provided on the side surfaces of the main gate (1) and the secondary gate (2), both sides of the upper end of the connecting plate (3) are respectively connected to the main gate (1) and the secondary gate (2) through pin shafts, the lower end of the connecting plate (3) is connected to a swing block (4) and the secondary gate (2) through a block pin shaft, a limiting platform (5) is provided on the surface of the secondary gate (2) opposite to the mating surface at the top, and the features are as follows: It further includes a main guide plate (6) and a sub-guide plate (7) for restricting the side swing of the main gate plate (1) and the sub-gate plate (2). The main guide plate (6) is arranged on the outer end face of the main gate plate (1) close to the main gate plate end, and the sub-guide plate (7) is arranged on the outer end face of the sub-gate plate (2) close to the sub-gate plate end. Limiting strips are provided on both sides of the main guide plate (6) and both sides of the sub-guide plate (7), and valve seat through holes (20) are provided in the middle of the main guide plate (6) and the sub-guide plate (7).

2. The gate assembly according to claim 1, wherein: The limiting platform (5) is detachably connected to the sub-gate plate (2) by bolts.

3. The gate assembly according to claim 1, wherein: The cross-section of the limiting strip is a right triangle. The two right-angled faces of the limiting strip are a connecting face and a limiting face respectively. The connecting face is used for fixedly connecting with the inner end face of the main guide plate (6) or the sub-guide plate (7). The limiting face of the limiting strip for limiting the main gate plate (1) is arranged parallel to the side face of the main gate plate, and the limiting face of the limiting strip for limiting the sub-gate plate (2) is arranged parallel to the side face of the sub-gate plate.

4. The gate assembly according to claim 3, wherein: Ball structures (9) are evenly clamped on the surface of the limiting face of the limiting strip.

5. The gate assembly according to claim 1, wherein: Sealing material replacement grooves (21) are provided at the sealing parts of the sealing surfaces of the main gate plate (1) and the sub-gate plate (2), and sealing material blocks (22) are detachably provided at the sealing material replacement grooves (21).

6. The gate assembly according to claim 1, wherein: Flow guiding holes (12) are provided at the lower parts of the main gate plate (1) and the sub-gate plate (2).

7. A spreading flat gate valve using the gate assembly according to any one of claims 1-6, characterized in that: It includes a valve body (13), a gate plate assembly, a valve cover (14), a bracket (15) and a gearbox (16). A valve seat (17) is installed at the valve seat hole (131) of the valve body (13). The gate plate assembly is arranged between the two valve seats (17). The valve cover (14) is arranged on the top surface of the valve body (13). The bracket (15) is arranged on the top surface of the valve cover (14). The gearbox (16) is arranged on the top surface of the bracket (15). A hand wheel (18) is installed at the front end of the gearbox (16). The inner end of the hand wheel (18) is connected to the top of the valve rod (19) through a gear assembly. The valve rod (19) is vertically arranged at the central position of the bracket (15). The lower end of the valve rod (19) passes through the valve cover (14) downward and is connected to the top of the gate plate assembly.

8. The expanding flat gate valve according to claim 7, characterized in that: A packing groove (141) is provided at the top of the valve cover (14). The packing groove (141) surrounds the valve rod (19). A fluororubber packing layer, a graphite packing layer and a grease injection packing layer are successively arranged in the packing groove (141). A packing gland (142) is also provided at the notch of the packing groove (141).

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