Sand prevention type flat gate valve for fracturing manifold

Abstract

The invention discloses a sand prevention type flat gate valve for a fracturing manifold, and relates to the technical field of flat gate valves, the sand prevention type flat gate valve comprises a valve body, the center of the valve body is provided with a valve cavity, the two sides of the center of the valve cavity are respectively provided with a valve seat, a gate plate is slidably connected between the two valve seats, and the gate plate and the valve body are correspondingly provided with through holes; a valve rod is connected to the top end of the gate plate and extends into the valve cover; valve seat grooves for containing the valve seats are formed in the two sides of the center of the valve body, a balance groove communicated with the valve seat grooves is formed in one side of the valve body, a balance ring assembly is arranged in the balance groove and comprises a first ring body and a second ring body which are connected in a sleeved mode, and an elastic body is arranged between the first ring body and the second ring body. The elastic body is used for elastically limiting the gate plate on one side, a gap between the valve seat and the gate plate can be eliminated, and gravel is prevented from flowing into the gap; water flow impact is dissipated, vibration of the valve seat and the flashboard is reduced, the flashboard gap possibility is reduced, and the deformation resistance and sand prevention capacity of the gate valve are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flat gate valves, and more specifically, to a sand-proof flat gate valve for a fracturing manifold. Background Art

[0002] In the development of conventional oil and gas fields, when oil and gas wells enter the later stage of exploitation, in order to increase the production of single wells, it is often necessary to fractur e the reservoir to obtain better oil and gas channels. In unconventional oil and gas exploration operations, due to special geological conditions, most oil and gas reservoirs have extremely low porosity and permeability, and the reservoirs must be fractur ed to obtain industrial oil and gas flows. The use of fracturing manifolds is very important in fracturing operations, and gate valves are often set on the fracturing manifolds to control the flow of oil and gas. During the use of the gate valve, when the gate plate is opening and closing, the sand in the gate plate flow channel hole directly enters the inner cavity of the valve body, and the precipitated sand directly affects the opening and closing of the gate plate.

[0003] In the prior art, the utility model patent with application number CN202220993426.1 discloses a sand-proof flat gate valve for a fracturing gas wellhead, including a valve body, an inner valve stem arranged in the valve body, a flowing sand channel arranged in the valve body, and a valve plate arranged at the bottom of the valve stem. The utility model sets a sand-proof valve seat in the valve body to block the connecting port between the active cavity of the valve plate and the flowing sand channel. The two ends of the sand-proof valve seat extend into the limiting groove and the positioning groove respectively to block the way to enter the active cavity of the valve body. At the same time, the setting of the adjusting cap further reduces the occurrence of a gap between the sand-proof valve seat and the valve plate. In this device, the adjusting cap is easily displaced by the impact of the fluid, and sand and gravel are also easily accumulated in the positioning groove, resulting in excessive vibration of the gate plate and a gap between the gate plate and the valve seat. Therefore, it is necessary to propose a sand-proof flat gate valve for a fracturing manifold to at least partially solve the problems existing in the prior art. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the present invention provides a sand-proof flat gate valve for a fracturing manifold, comprising:

[0006] A valve body, a valve cavity is arranged at the center of the valve body, valve seats are arranged on both sides of the center of the valve cavity, a gate plate is slidably connected between the two valve seats, and through holes are arranged on the gate plate and the valve body accordingly; a valve stem is connected to the top of the gate plate, and the valve stem extends into the valve cover; valve seat grooves for accommodating the valve seats are arranged on both sides of the center of the valve body, a balancing groove connected with the valve seat groove is arranged on one side of the valve body, a balancing ring assembly is arranged in the balancing groove, and the balancing ring assembly includes a first ring body and a second ring body which are sleeved together, and an elastomer is arranged between the first ring body and the second ring body.

[0007] Preferably, a plurality of limiting grooves are evenly arranged on the outer wall of the valve seat along the circumferential direction, and a plurality of limiting blocks are evenly arranged on the side wall of the valve seat groove along the circumferential direction, and the limiting blocks are clamped in the limiting grooves.

[0008] Preferably, the valve seat is located at one end in the valve seat groove, and a sealing ring is provided between the valve seat and the end of the valve seat groove.

[0009] Preferably, the balancing ring assembly includes: a supporting ring, a first ring body connected to the supporting ring, the first ring body and the second ring body are both arranged in a C shape, the second ring body is slidably connected to the first ring body and is arranged to form an elastic space, and the elastic space is filled with an elastomer; the first ring body is slidably arranged in the balancing groove, the first ring body abuts against a valve seat on one side, and the second ring body abuts against an end of the balancing groove away from the valve seat groove.

[0010] Preferably, the first ring body is configured as a sandwich structure, and the first ring body includes a first C-type ring, an elastic interlayer and a second C-type ring arranged in sequence, the first C-type ring is connected to the support ring, the second C-type ring abuts against the valve seat, the end of the elastic interlayer is retracted relative to the first C-type ring and the second C-type ring, and the second ring body is slidably connected between the first C-type ring and the second C-type ring, and the end abuts against the elastic interlayer.

[0011] Preferably, a plurality of grooves are evenly arranged on the side surface of the first C-shaped ring, the grooves are recessed toward the support ring, and the groove parts are connected to the support ring; a plurality of protrusions are evenly arranged on the inner side surface of the second C-shaped ring, the protrusions protrude toward the support ring, and the protrusions correspond one-to-one to the grooves.

[0012] Preferably, a plurality of groups of protection units are evenly arranged on one side of the support ring close to the second ring body, and the protection unit includes a central airbag assembly, and the central airbag assembly includes:

[0013] A central airbag seat, which is connected to a side of the support ring close to the second ring body;

[0014] A central airbag, one end of the central airbag is connected to the central airbag seat;

[0015] The central shock-absorbing ring is connected to the other end of the central airbag, and the central shock-absorbing ring abuts against the side wall of the second ring body.

[0016] Preferably, the protection unit includes an auxiliary airbag assembly, and the auxiliary airbag assembly includes:

[0017] An auxiliary airbag seat, the auxiliary airbag seat is connected to a side of the support ring close to the second ring body, and a plurality of auxiliary airbag seats are evenly distributed on the support ring;

[0018] Auxiliary airbag, one end of the auxiliary airbag is connected to the auxiliary airbag seat, and the auxiliary airbag is connected to the central airbag through a pipeline;

[0019] An auxiliary shock absorbing ring, which is connected to the other end of the auxiliary airbag seat and abuts against the side wall of the second ring body;

[0020] The column is connected to the center of the auxiliary shock-absorbing ring through a connecting rod, and a circular hole for accommodating the column is arranged on the second ring body.

[0021] Preferably, the central shock-absorbing ring and the auxiliary shock-absorbing ring are arranged in a wave shape, and the raised points of the central shock-absorbing ring and the auxiliary shock-absorbing ring abut against the second ring body.

[0022] Preferably, the protection unit further comprises:

[0023] A cutting blade rod connected to the center of one end of the central air bag close to the central shock absorbing ring;

[0024] A cutting knife connected to the other end of the cutting knife rod;

[0025] A sealing cylinder connected to the center of the auxiliary airbag seat;

[0026] A sealing film, which is covered at the air outlet end of the sealing cylinder and is spaced a preset distance from the cutting knife;

[0027] A crimping sleeve, which is threadedly connected to the air outlet end of the sealing tube and crimped onto the sealing film;

[0028] The air storage cavity is arranged in the support ring and communicated with the sealing cylinder, and an air injection port is arranged in the air storage cavity.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] The invention provides a sand-proof flat gate valve for a fracturing manifold. The valve seat is set to effectively limit the gate plate in the horizontal direction, thereby reducing the impact deformation of the gate plate during operation. An elastomer is used to elastically limit the gate plate on one side, thereby helping to eliminate the gap between the valve seat and the gate plate and prevent sand and gravel from flowing into the gap. The balance ring assembly is elastically set in the entire balance groove to reduce the accumulation of sand and gravel in the balance groove. At the same time, the impact of water flow is dissipated to reduce the vibration of the valve seat and the gate plate, reduce the possibility of the gate plate coming off the gap, and improve the gate valve's deformation resistance and sand-proof capabilities.

[0031] The sand-proof flat gate valve for a fracturing manifold described in the present invention, other advantages, objectives and features of the present invention will be partially reflected through the following description, and will also be partially understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 This is a structural schematic diagram of a sand-proof flat gate valve for a fracturing manifold according to the present invention;

[0034] Figure 2 For the present invention Figure 1 The local enlarged structure diagram at A in the middle;

[0035] Figure 3 It is a schematic diagram of the cross-sectional structure of the balance ring assembly in the present invention;

[0036] Figure 4 It is a schematic diagram of the cross-sectional structure of the balance ring assembly in the present invention (the first C-shaped ring is provided with a groove);

[0037] Figure 5 It is a schematic diagram of the installation structure of the protection unit in the present invention;

[0038] Figure 6 It is a structural schematic diagram of the protection unit in the present invention;

[0039] Figure 7 It is a schematic diagram of the cross-sectional structure of the central airbag in the present invention.

[0040] In the figure: 1. valve body; 2. valve cavity; 3. valve seat; 4. gate; 5. valve stem; 6. valve cover; 7. balancing groove; 8. valve seat groove; 9. limiting groove; 10. limiting block; 11. first ring body; 12. second ring body; 13. elastomer; 14. sealing ring; 15. supporting ring; 16. first C-type ring; 17. elastic interlayer; 18. second C-type ring; 19. groove; 20. bump; 21. central airbag seat; 22. central airbag; 23. central shock-absorbing ring; 24. auxiliary airbag seat; 25. auxiliary airbag; 26. auxiliary shock-absorbing ring; 27. column; 28. cutting knife rod; 29. ​​cutting knife; 31. sealing cylinder; 32. sealing film; 33. crimping sleeve. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0042] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0043] Embodiment 1:

[0044] like Figure 1-4 As shown, the present invention provides a sand-proof flat gate valve for a fracturing manifold, comprising:

[0045] A valve body 1 is provided with a valve cavity 2 at the center of the valve body 1, valve seats 3 are respectively provided on both sides of the center of the valve cavity 2, a gate plate 4 is slidably connected between the two valve seats 3, and through holes are correspondingly provided on the gate plate 4 and the valve body 1; a valve stem 5 is connected to the top of the gate plate 4, and the valve stem 5 extends into the valve cover 6; valve seat grooves 8 for accommodating the valve seats 3 are provided on both sides of the center of the valve body 1, a balancing groove 7 connected with the valve seat groove 8 is provided on one side of the valve body 1, a balancing ring assembly is provided in the balancing groove 7, and the balancing ring assembly includes two first ring bodies 11 and second ring bodies 12 that are sleeved, and an elastomer 13 is provided between the first ring body 11 and the second ring body 12.

[0046] The working principle and beneficial effects of the above technical solution are:

[0047] The present invention provides a sand-proof flat gate valve for a fracturing manifold, wherein a head channel is arranged at the center of a valve body 1 for allowing fluid to pass through; a gate plate 4 is arranged in a valve cavity 2, and the gate plate 4 moves up and down in the valve cavity 2, and the moving direction of the gate plate 4 is perpendicular to the flow direction of the fluid; the gate plate 4 is driven to move by the action of a valve stem 5 in a valve cover 6, and when the gate plate 4 moves to the lower part, the flow path of the fluid in the valve cavity 2 is cut off, so that the gate valve is closed; when the gate plate 4 moves to the upper part, the through hole on the gate plate 4 corresponds to the central channel of the valve body 1, so that the fluid can flow through the valve body 1, so that the gate valve is opened. A valve seat 3 is arranged in the valve body 1, and two valve seats 3 are abutted against both sides of the gate plate 4 to limit the valve seat 3 in the horizontal direction. The valve seat groove 8 is used to accommodate the valve seat 3 to keep the position of the valve seat 3 stable; a balancing groove 7 is arranged on one side of the valve seat groove 8, and the first ring body 11 and the second ring body 12 maintain the tendency to expand due to the elastic effect of the intermediate elastic body 13, and are crimped to one side of the valve seat 3 to eliminate the gap between the valve seat 3 and the gate plate 4, thereby preventing sand and gravel from flowing into the gap and affecting the movement of the gate plate 4; when the gate plate 4 is impacted by the water flow, the elastic body 13 dissipates the impact force to reduce the vibration of the valve seat 3 and the gate plate 4.

[0048] Through the above-mentioned structural design, the valve seat 3 is set to effectively limit the gate plate 4 in the horizontal direction, reducing the impact deformation of the gate plate 4 during operation; the elastic body 13 is used to elastically limit the gate plate 4 on one side, which helps to eliminate the gap between the valve seat 3 and the gate plate 4 and prevent sand and gravel from flowing into the gap; the balance ring assembly is elastically set in the entire balance groove 7 to reduce the accumulation of sand and gravel in the balance groove 7; at the same time, the water flow impact is dissipated to reduce the vibration on the valve seat 3 and the gate plate 4, reduce the possibility of the gate plate 3 coming off the gap, and improve the gate valve's anti-deformation and sand prevention capabilities.

[0049] Embodiment 2:

[0050] like Figure 2 As shown, based on the above-mentioned embodiment 1, a plurality of limit grooves 9 are evenly arranged on the outer wall of the valve seat 3 along the circumferential direction, and a plurality of limit blocks 10 are evenly arranged on the side wall of the valve seat groove 8 along the circumferential direction, and the limit blocks 10 are clamped in the limit grooves 9.

[0051] The valve seat 3 is located at one end in the valve seat groove 8 , and a sealing ring 14 is arranged between the valve seat 3 and the end of the valve seat groove 8 .

[0052] The working principle and beneficial effects of the above technical solution are:

[0053] A limiting groove 9 is provided on the valve seat 3. When the valve seat 3 is installed, the limiting block 10 in the valve seat groove 8 is clamped in the limiting groove 9 to limit the rotation of the valve seat 3, thereby further improving the structural stability of the gate valve.

[0054] A sealing ring 14 is used to seal the end of the valve seat 3 and the valve seat groove 8 to reduce the possibility of fluid leakage.

[0055] Embodiment 3:

[0056] like Figure 3 , 4 As shown, on the basis of the above-mentioned embodiment 1, the balancing ring assembly includes: a support ring 15, a first ring body 11 is connected to the support ring 15, the first ring body 11 and the second ring body 12 are both arranged in a C shape, the second ring body 12 is slidably connected to the first ring body 11 and is surrounded to form an elastic space, and the elastic space is filled with an elastomer 13; the first ring body 11 is slidably arranged in the balancing groove 7, the first ring body 11 abuts against the valve seat 3 on one side, and the second ring body 12 abuts against one end of the balancing groove 7 away from the valve seat groove 8.

[0057] The working principle and beneficial effects of the above technical solution are:

[0058] The support ring 15 is arranged at the center of the balancing ring assembly to support the first ring body 1 and the elastomer 13 to maintain the structural stability of the balancing ring assembly; the first ring body 11 and the second ring body 12 are arranged in an enclosing manner to limit the deformation of the first ring body 11 and the second ring body 12 to the axial direction, thereby reducing the torsion of the balancing ring assembly; the elastomer 13 is elastic and can be compressed within a preset range. Through the setting of the elastomer 13, the first ring body 11 can maintain contact with the valve seat 3, exert pressure on the valve seat 3, and thereby reduce the gap between the valve seat 3 and the gate plate 4; the second ring body 12 can contact the end of the valve seat groove 8, and the first ring body 11 and the second ring body 12 block the outside of the valve seat groove 8 to prevent sand and gravel from flowing into the installation gap of the valve seat groove 8 and accumulating, thereby ensuring the normal expansion and contraction of the first ring body 11 and the second ring body 12.

[0059] Embodiment 4:

[0060] like Figure 3 , 4 As shown, on the basis of the above-mentioned embodiment 4, the first ring body 11 is configured as a sandwich structure, and the first ring body 11 includes a first C-type ring 16, an elastic interlayer 17 and a second C-type ring 18 which are arranged in sequence, the first C-type ring 16 is connected to the support ring 15, the second C-type ring 18 abuts against the valve seat 3, the end of the elastic interlayer 17 is retracted relative to the first C-type ring 16 and the second C-type ring 18, and the second ring body 12 is slidably connected between the first C-type ring 16 and the second C-type ring 18, and the end thereof abuts against the elastic interlayer 17.

[0061] The working principle and beneficial effects of the above technical solution are:

[0062] The first ring body 11 is arranged as a sandwich structure, and the elastic interlayer 17 in the sandwich can abut against the end of the second ring body 12, provide elastic force for the end of the second ring body 12, and improve the elasticity of the balance ring assembly; when the second ring body 12 is impacted by the fluid and tends to deform radially, the impact will be dissipated by the elastomer and distributed to the first C-type ring 16 and the second C-type ring 18, thereby reducing the radial displacement of the balance ring assembly.

[0063] Embodiment 5:

[0064] like Figure 4 As shown, on the basis of the above-mentioned embodiment 4, a plurality of grooves 19 are evenly arranged on the side surface of the first C-shaped ring 16, the grooves 19 are recessed toward the support ring 15, and a portion of the grooves 19 is connected to the support ring 15; a plurality of protrusions 20 are evenly arranged on the inner side surface of the second C-shaped ring 18, the protrusions 20 protrude toward the support ring 15, and the protrusions 20 correspond one-to-one to the grooves 19.

[0065] The working principle and beneficial effects of the above technical solution are:

[0066] A groove 19 is provided on the side of the first C-shaped ring 16, and a protrusion 20 is provided on the side of the second C-shaped ring 18, so that the elastic interlayer 17 forms a wavy structure. On the one hand, when the end of the elastic interlayer 17 is subjected to the pressure of the second ring body 12, the wavy structure of the elastic interlayer 17 can prevent the elastic interlayer 17 from being separated from the first C-shaped ring 16 and the second C-shaped ring 18; on the other hand, the elastic interlayer 17 can extend the vibration transmission path, reduce the transmission of the vibration wave to the valve seat 3, and further dissipate the vibration wave.

[0067] Embodiment 6:

[0068] like Figure 5-7 As shown, based on the above-mentioned embodiment 3, a plurality of protection units are evenly arranged on one side of the support ring 15 close to the second ring body 12, and the protection unit includes a central airbag assembly, and the central airbag assembly includes:

[0069] A central airbag seat 21, the central airbag seat 21 is connected to a side of the support ring 15 close to the second ring body 12;

[0070] A central airbag 22, one end of the central airbag 22 is connected to the central airbag seat 21;

[0071] The central shock absorbing ring 23 is connected to the other end of the central airbag 22 , and the central shock absorbing ring 23 abuts against the side wall of the second ring body 12 .

[0072] The working principle and beneficial effects of the above technical solution are:

[0073] When subjected to a large fluid impact force, the elastic body 13 may produce a large deformation, causing the balance ring assembly to fail, resulting in the valve seat 3 and the gate plate 4 being separated. A protection unit is set on the support ring 15. When in use, the central airbag 22 is installed on the central airbag seat 21, and the central shock-absorbing ring 23 on the central airbag 22 abuts against the second ring body 12. The vibration wave is transmitted to the central airbag 22 through the central shock-absorbing ring 23. When the second ring body 12 is compressed, the central airbag 22 is also compressed and deformed. The central airbag 22 has a shock-absorbing effect on the second ring body 12, thereby improving the axial deformation resistance of the balance ring assembly.

[0074] Embodiment 7:

[0075] like Figure 5-7 As shown, based on the above-mentioned embodiment 6, the protection unit includes an auxiliary airbag assembly, and the auxiliary airbag assembly includes:

[0076] An auxiliary airbag seat 24, the auxiliary airbag seat 24 is connected to a side of the support ring 15 close to the second ring body 12, and a plurality of auxiliary airbag seats 24 are evenly distributed on the support ring 15;

[0077] An auxiliary airbag 25, one end of the auxiliary airbag 25 is connected to the auxiliary airbag seat 24, and the auxiliary airbag 25 is connected to the central airbag 22 through a pipeline;

[0078] An auxiliary shock absorbing ring 26, the auxiliary shock absorbing ring 26 is connected to the other end of the auxiliary airbag seat 24, and the auxiliary shock absorbing ring 26 abuts against the side wall of the second ring body 12;

[0079] The column 27 is connected to the center of the auxiliary shock-absorbing ring 26 through a connecting rod 28 , and a circular hole for accommodating the column 27 is provided on the second ring body 12 .

[0080] The central damping ring 23 and the auxiliary damping ring 26 are arranged in a wave shape, and the raised points of the central damping ring 23 and the auxiliary damping ring 26 abut against the second ring body 12 .

[0081] The working principle and beneficial effects of the above technical solution are:

[0082] Auxiliary airbags 25 are arranged around the central airbag 22. The auxiliary airbags 25 provide auxiliary support for the second ring body 12 and play a role of auxiliary shock absorption. When used in conjunction with the central airbag 22, the deformation resistance of the balance ring assembly can be improved, the shock absorption effect can be improved, and the load on the elastomer 13 can be reduced. The column 27 and the circular hole are used to limit the radial direction of the second ring body 12 to reduce the radial slip of the second ring body 12. The central shock absorbing ring 23 and the auxiliary shock absorbing ring 26 are set to a wave shape, so that the shock absorbing ring is in point contact with the second ring body 12, which can effectively isolate the vibration wave and maintain the balance of the second ring body 12.

[0083] Embodiment 8:

[0084] like Figure 5-7 As shown, based on the above-mentioned embodiment 7, the protection unit further includes:

[0085] A cutting bar 28, the cutting bar 28 is connected to the center of one end of the central air bag 22 close to the central shock absorbing ring 23;

[0086] A cutting knife 29, the cutting knife 29 is connected to the other end of the cutting knife rod 28;

[0087] A sealing tube 31, the sealing tube 31 is connected to the center of the auxiliary airbag seat 24;

[0088] The sealing film 32 is covered on the air outlet end of the sealing tube 31 and is spaced apart from the cutting knife 29 by a preset distance;

[0089] A crimping sleeve 33, which is threadedly connected to the air outlet end of the sealing sleeve 31 and crimped onto the sealing film 32;

[0090] The air storage cavity is arranged in the support ring 15 and communicated with the sealing tube 31 , and an air injection port is arranged in the air storage cavity.

[0091] The working principle and beneficial effects of the above technical solution are:

[0092] When the second ring body 12 is squeezed, the central airbag 22 and the auxiliary airbag 25 are squeezed to shorten them, and the cutting knife rod 28 on the central airbag 22 approaches the sealing film 32; when the pressure on the second ring body 12 exceeds the preset value, the cutting knife rod 28 contacts the sealing film 32 and cuts the sealing film 32; the high-pressure gas in the air storage chamber passes through the sealing film 32 and enters the central airbag 22, causing the central airbag 22 to expand rapidly and restore to a preset length, and the central airbag 22 and the auxiliary airbag 25 are connected, so that the auxiliary airbag 25 also restores to a preset length, providing support for the second ring body 12, and limiting the deformation of the second ring body 12 within a preset range, thereby protecting the balance ring assembly; when performing maintenance, the crimping sleeve 33 is rotated and removed from the sealing cylinder 31, and after replacing the new sealing film 32, the crimping sleeve 33 is rotated and installed, and then a preset amount of gas is introduced into the air storage chamber through the gas injection port, which is convenient for the maintenance of the flat gate valve.

[0093] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element 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.

[0094] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A sand-proof flat gate valve for a fracturing manifold, characterized in that: include: A valve body (1), wherein a valve cavity (2) is arranged at the center of the valve body (1), valve seats (3) are arranged on both sides of the center of the valve cavity (2), a gate plate (4) is slidably connected between the two valve seats (3), and through holes are correspondingly arranged on the gate plate (4) and the valve body (1); a valve stem (5) is connected to the top of the gate plate (4), and the valve stem (5) extends into the valve cover (6); valve seat grooves (8) for accommodating the valve seat (3) are arranged on both sides of the center of the valve body (1), and a balancing groove (7) connected to the valve seat groove (8) is arranged on one side of the valve body (1), and a balancing ring assembly is arranged in the balancing groove (7), and the balancing ring assembly includes a first ring body (11) and a second ring body (12) which are sleeved together, and an elastic body (13) is arranged between the first ring body (11) and the second ring body (12).

2. A sand-proof flat gate valve for a fracturing manifold according to claim 1, characterized in that: The outer wall of the valve seat (3) is evenly provided with a plurality of limit grooves (9) along the circumferential direction, and the side wall of the valve seat groove (8) is evenly provided with a plurality of limit blocks (10) along the circumferential direction, and the limit blocks (10) are clamped in the limit grooves (9).

3. The sand-proof flat gate valve for a fracturing manifold according to claim 1, characterized in that: The valve seat (3) is located at one end of the valve seat groove (8), and a sealing ring (14) is arranged between the valve seat and the end of the valve seat groove (8).

4. The sand-proof flat gate valve for a fracturing manifold according to claim 1, characterized in that: The balancing ring assembly comprises: a supporting ring (15), a first ring body (11) connected to the supporting ring (15), the first ring body (11) and the second ring body (12) are both arranged in a C shape, the second ring body (12) is slidably connected to the first ring body (11) and is arranged to form an elastic space, and the elastic space is filled with an elastic body (13); the first ring body (11) is slidably arranged in the balancing groove (7), the first ring body (11) is in contact with a valve seat (3) on one side, and the second ring body (12) is in contact with an end of the balancing groove (7) away from the valve seat groove (8).

5. The sand-proof flat gate valve for a fracturing manifold according to claim 4, characterized in that: The first ring body (11) is arranged as a sandwich structure, and the first ring body (11) comprises a first C-shaped ring (16), an elastic sandwich (17) and a second C-shaped ring (18) which are arranged in sequence, the first C-shaped ring (16) is connected to the support ring (15), the second C-shaped ring (18) is in contact with the valve seat (3), the end of the elastic sandwich (17) is retracted relative to the first C-shaped ring (16) and the second C-shaped ring (18), and the second ring body (12) is slidably connected between the first C-shaped ring (16) and the second C-shaped ring (18), and the end thereof is in contact with the elastic sandwich (17).

6. A sand-proof flat gate valve for a fracturing manifold according to claim 5, characterized in that: A plurality of grooves (19) are evenly arranged on the side surface of the first C-shaped ring (16), the grooves (19) are recessed in the direction of the support ring (15), and a portion of the grooves (19) is connected to the support ring (15); a plurality of protrusions (20) are evenly arranged on the inner side surface of the second C-shaped ring (18), the protrusions (20) protrude in the direction of the support ring (15), and the protrusions (20) correspond one to one with the grooves (19).

7. The sand-proof flat gate valve for a fracturing manifold according to claim 4, characterized in that: A plurality of groups of protection units are evenly arranged on one side of the support ring (15) close to the second ring body (12), and the protection units include a central airbag assembly, and the central airbag assembly includes: A central airbag seat (21), the central airbag seat (21) is connected to a side of the support ring (15) close to the second ring body (12); A central airbag (22), one end of which is connected to the central airbag seat (21); A central shock absorbing ring (23) is connected to the other end of the central air bag (22), and the central shock absorbing ring (23) abuts against the side wall of the second ring body (12).

8. The sand-proof flat gate valve for a fracturing manifold according to claim 7, characterized in that: The protection unit includes an auxiliary airbag assembly, and the auxiliary airbag assembly includes: An auxiliary airbag seat (24), the auxiliary airbag seat (24) is connected to a side of the support ring (15) close to the second ring body (12), and a plurality of auxiliary airbag seats (24) are evenly distributed on the support ring (15); An auxiliary airbag (25), one end of the auxiliary airbag (25) is connected to the auxiliary airbag seat (24), and the auxiliary airbag (25) is connected to the central airbag (22) through a pipeline; An auxiliary shock absorbing ring (26), the auxiliary shock absorbing ring (26) is connected to the other end of the auxiliary airbag seat (24), and the auxiliary shock absorbing ring (26) is in contact with the side wall of the second ring body (12); The column (27) is connected to the center of the auxiliary shock-absorbing ring (26) through a connecting rod (28), and a circular hole for accommodating the column (27) is provided on the second ring body (12).

9. The sand-proof flat gate valve for a fracturing manifold according to claim 8, characterized in that: The central shock absorbing ring (23) and the auxiliary shock absorbing ring (26) are arranged in a wave shape, and the convex points of the central shock absorbing ring (23) and the auxiliary shock absorbing ring (26) are in contact with the second ring body (12).

10. The sand-proof flat gate valve for a fracturing manifold according to claim 7, characterized in that: The protection unit also includes: A cutting blade (28), the cutting blade (28) being connected to the center of one end of the central air bag (22) close to the central shock absorbing ring (23); A cutting knife (29), the cutting knife (29) is connected to the other end of the cutting knife rod (28); A sealing cylinder (31), the sealing cylinder (31) is connected to the center of the auxiliary airbag seat (24); A sealing film (32), the sealing film (32) is covered on the air outlet end of the sealing cylinder (31) and is spaced apart from the cutting knife (29) by a preset distance; A crimping sleeve (33), the crimping sleeve (33) is threadedly connected to the air outlet end of the sealing sleeve (31) and crimped onto the sealing film (32); An air storage cavity is arranged in the support ring (15) and is in communication with the sealing cylinder (31), and an air injection port is arranged in the air storage cavity.

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