Gate plate assembly fixing structure and gate valve

Abstract

The invention relates to the technical field of valve design, in particular to a flashboard assembly fixing structure and a gate valve. The two flashboards are arranged oppositely and are suitable for adjusting the relative positions of the flashboards and a valve seat under the action of a valve rod; the anti-rotation part and the elastic compensation part are arranged on the end faces of the flashboards, the anti-rotation part is suitable for limiting relative rotation of the two flashboards, and the elastic compensation part is suitable for dynamically compensating a gap between the two flashboards, so that the abutting positions of the flashboards and the valve seat are in sealing fit; and the mounting part is arranged on the circumferential surface of the gate plate and is suitable for being connected with a valve rod. In the invention, the anti-rotation part directly acts on the end surfaces of the flashboards, so that the relative rotation of the double flashboards caused by fluid impact or mechanical vibration is effectively inhibited, and the leakage risk caused by dislocation of the sealing surfaces is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of valve design, and in particular to a gate plate assembly fixing structure and a gate valve. Background Art

[0002] In gate valves, the valve opening is generally adjusted by adjusting the relative position between the gate and the valve seat. However, if the sealing surfaces of the valve seat are not parallel, the seat and the gate may not seal properly, causing media leakage. Alternatively, if the seat and the gate deform due to the influence of the media temperature, they may become stuck, thus affecting the normal operation of the valve. Summary of the Invention

[0003] In view of this, the present invention provides a gate assembly fixing structure and a gate valve to solve the problem that the existing gate valve may not be able to seal or become stuck.

[0004] In a first aspect, the present invention provides a gate assembly fixing structure, comprising:

[0005] Two gates arranged opposite to each other are adapted to adjust their relative positions to the valve seat under the action of the valve stem;

[0006] The anti-rotation portion and the elastic compensation portion are provided on the end surface of the gate plate, the anti-rotation portion is adapted to limit the relative rotation of the two gate plates, and the elastic compensation portion is adapted to dynamically compensate for the gap between the two gate plates, so that the abutment between the gate plate and the valve seat is in a sealed fit;

[0007] The mounting portion is arranged on the circumferential surface of the gate plate and is suitable for connecting with the valve stem.

[0008] In this application, the anti-rotation mechanism acts directly on the gate end faces, effectively inhibiting relative rotation of the two gates due to fluid impact or mechanical vibration, thereby preventing leakage caused by sealing surface misalignment. The elastic compensation mechanism incorporates a dynamic clearance adjustment mechanism. This continuously provides adaptive compensation force when the valve seat changes size due to wear or thermal deformation, preventing the valve seat and gate from becoming stuck while ensuring uniform compression between the gate and seat.

[0009] In an optional embodiment, the anti-rotation portion includes:

[0010] Anti-rotation blind holes, at least two groups, are provided on the opposite end faces of the two gate plates;

[0011] The anti-rotation pin is inserted into the anti-rotation blind hole that matches each other.

[0012] In this application, multiple sets of distributed point constraints are used to eliminate the gate's circumferential displacement freedom. The layout of anti-rotation blind holes machined on the end face saves radial space and avoids interference with the flow channel.

[0013] In an optional embodiment, the length of the anti-rotation pin is greater than the sum of the maximum gaps between the two gate plates and the depth of an anti-rotation blind hole, and the length of the anti-rotation pin is less than the sum of the depths of the two mating anti-rotation blind holes.

[0014] In this application, the lower limit size ensures that the pin body can still be effectively embedded in the double blind hole at the maximum design gap to prevent the anti-rotation function from failing; the upper limit size ensures that the pin body will not hit the bottom of the blind hole too early during the closing process of the gate, and reserves the necessary deformation space for the elastic compensation part, so that the anti-rotation pin can fully transmit torque and allow the gate to float slightly under the action of the compensation spring.

[0015] In an optional embodiment, the elastic compensation portion includes:

[0016] Compensating blind holes are arranged on the opposite end faces of the two gate plates;

[0017] The first spring abuts between the bottom ends of the mutually matched compensation blind holes.

[0018] In this application, the compensation blind holes are arranged in pairs to form a closed cavity, providing guidance and protection for the first spring. The first spring abuts the bottom end of the blind hole in both directions, so that the compensation force is transmitted symmetrically along the gate axis, eliminating the risk of gate tilt caused by offset load. The elastic element is completely built into the gate to avoid corrosion from external media and ensure long-term elastic performance stability. The dynamic compression characteristics of the first spring can absorb the thermal expansion and contraction deformation of the valve seat in real time and compensate for the wear of the sealing surface. Compared with rigid compensation, this design significantly reduces the fluctuation of the sealing surface pressure ratio and maintains constant sealing performance under frequent opening and closing conditions.

[0019] In an optional embodiment, the mounting portion includes:

[0020] A T-shaped groove is provided on the circumferential surface of the gate plate and is suitable for detachable connection of the end portion of the valve stem.

[0021] In this application, the T-slot provides three-dimensional mechanical locking of the valve stem end. Its inverted tapered structure creates a self-locking effect, preventing loosening under high-vibration conditions. The T-slot's shape matches the stem end, ensuring lossless transmission of driving force and avoiding the risk of shear failure associated with traditional pinned connections. This allows for slight stem oscillation, eliminating gate jamming caused by stem assembly deviations and improving the system's tolerance to installation errors.

[0022] In a second aspect, the present invention further provides a gate valve, comprising:

[0023] The valve body and the valve cover are detachably connected to form a first cavity, the valve body having a flow channel communicating with the first cavity, and two valve seats are provided on the flow channel at a position communicating with the first cavity;

[0024] The gate assembly fixing structure as described above;

[0025] a valve stem, passing through the valve cover to the first cavity, and having an end connected to a mounting portion of the gate assembly fixing structure;

[0026] The valve stem is suitable for adjusting the relative positions of the gate plate and the valve seat along the length direction, and the gate plate is always in contact with the valve seat.

[0027] In this application, the first cavity provides a sealed space for the gate's movement. The dual valve seats and dual gates form a bidirectional sealing system, completely eliminating the problem of reverse pressure leakage in single-gate valves. The valve stem extends through the bonnet, completely isolating the drive mechanism from the media and ensuring operational safety. The gate maintains constant contact with the seat, preventing separation and potentially affecting the normal operation of the gate valve.

[0028] In an optional embodiment, the valve cover is provided with a sealing seat, the valve stem passes through the sealing seat and has an abutment step, and in a fully open state, the abutment step is sealingly engaged with the end face of the sealing seat.

[0029] In this application, a sealing seat is provided on the valve cover to form a sealing barrier. When the gate valve is fully open, the sealing engagement between the abutment step and the end face of the sealing seat blocks the path for media leakage along the axial direction of the valve stem, resolving the wear problem of traditional packing seals. The flat seal between the abutment step and the end face of the sealing seat is self-centering and unaffected by valve stem deflection.

[0030] In an optional embodiment, the valve stem is sleeved with a fixing ring, and the gate plate has an accommodating groove to accommodate the fixing ring;

[0031] The valve stem is embedded with a split ring assembly, which abuts against the fixed ring and is suitable for axially limiting the fixed ring;

[0032] The outer side of the split ring assembly is provided with a clamping sleeve, the clamping sleeve has a protrusion facing the valve stem, and a second spring is provided between the protrusion and the split ring assembly.

[0033] In this application, the engagement of the retaining ring and the accommodating groove achieves axial linkage between the valve stem and the gate. The split-ring assembly's split structure solves the valve stem assembly challenge. The ferrule protrusion cooperates with the second spring to prevent the split-ring assembly from separating from the valve stem during mechanical vibration. The second spring absorbs the impact loads of opening and closing, preventing rigid impacts caused by mechanical limiters. This ensures stable alignment even under high-temperature creep conditions.

[0034] In an optional embodiment, the valve stem includes a smooth portion and a threaded portion, the smooth portion has a waist-shaped cross-section, the valve cover is connected to a guide portion, the guide portion includes a guide rod, a first guide rib arranged on the guide rod, and a guide piece mounted on the smooth portion, and the first guide rib is inserted into the guide piece.

[0035] In the present application, the non-circular fit between the waist-shaped cross-section valve stem and the guide member can completely prevent relative rotation. The sliding pair of the first guide rib embedded in the guide groove strictly limits the movement of the valve stem to the axial direction, and prevents the valve stem from rotating relative to the valve cover and valve body.

[0036] In an optional embodiment, a second cavity is provided at the end of the guide rod, and the threaded portion passes through the second cavity;

[0037] A threaded member is provided in the second cavity, the threaded member is screwed onto the threaded portion and extends to the outside of the second cavity;

[0038] The second cavity has a limiting member, and the limiting member is suitable for limiting the position of the threaded member in the axial direction;

[0039] The portion of the threaded member located outside the second cavity is threadedly connected with a handwheel and a locking nut, and the handwheel is located between the locking nut and the second cavity.

[0040] In this application, the stopper prevents the threaded member from being unscrewed and extending out of the cavity. Relative rotation between the handwheel and the threaded member allows the valve stem to move axially, and the guide member prevents the valve stem from rotating during this movement. The locking nut limits the handwheel's position, ensuring that it remains threadedly engaged with the threaded member. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 This is a schematic structural diagram of an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of the position of the split-loop assembly according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the partial structure of embodiment B of the present invention;

[0045] Figure 4 This is a schematic diagram of the partial structure of embodiment A of the present invention;

[0046] Figure 5 This is a schematic diagram of the partial structure of embodiment C of the present invention;

[0047] Figure 6 Schematic diagram of the gate structure according to an embodiment of the present invention.

[0048] Description of reference numerals:

[0049] 1. Gate; 2. Valve stem; 3. Valve seat; 4. Anti-rotation blind hole; 5. Anti-rotation pin; 6. Compensating blind hole; 7. First spring; 8. T-slot; 9. Valve body; 10. Valve cover; 11. Sealing seat; 12. Abutment step; 13. Accommodation groove; 14. Retaining ring; 15. Cutting ring; 16. Protrusion; 17. Second spring; 18. Guide rod; 19. First guide rib; 20. Guide member; 21. Threaded member; 22. Limit member; 23. Handwheel; 24. Lock nut; 25. Tooling groove; 26. Limiting boss; 27. Packing; 28. Press sleeve; 29. ​​Press plate; 30. First pair of open rings; 31. Second pair of open rings; 32. Second guide rib; 33. Guide groove. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0051] The following combination Figures 1 to 6 , describing embodiments of the present invention.

[0052] Example 1

[0053] According to an embodiment of the present invention, Figures 1 to 6 As shown, a gate assembly fixing structure is provided, comprising:

[0054] Two opposing gates 1 are adapted to adjust their relative position to the valve seat 3 under the action of the valve stem 2. The gates 1 can be arranged in parallel. A sealing surface is provided on the side of the gate 1 facing the valve seat 3. The contact between the sealing surface of the gate 1 and the valve seat 3 can be welded with Stellite alloy for wear and corrosion resistance.

[0055] The anti-rotation part and the elastic compensation part are arranged on the end face of the gate plate 1. The anti-rotation part is suitable for limiting the relative rotation of the two gate plates 1, and the elastic compensation part is suitable for dynamically compensating the gap between the two gate plates 1, so that the abutment between the gate plate 1 and the valve seat 3 is a sealed fit; the elastic compensation part can be a rubber ring connected between the two gate plates 1, which dynamically compensates for the gap between the two gate plates 1.

[0056] The mounting portion is provided on the circumferential surface of the gate plate 1 and is suitable for connecting the valve stem 2 .

[0057] In this application, the anti-rotation component acts directly on the end face of the gate 1, effectively inhibiting relative rotation of the dual gates 1 due to fluid impact or mechanical vibration, thereby avoiding the risk of leakage caused by misalignment of the sealing surfaces. The elastic compensation component incorporates a dynamic clearance adjustment mechanism. When the valve seat 3 undergoes dimensional changes due to wear or thermal deformation, it continuously provides adaptive compensation force to prevent the valve seat 3 and gate 1 from becoming stuck, while ensuring that the gate 1 and valve seat 3 are always evenly compressed.

[0058] In an optional embodiment, as Figure 5 As shown, the anti-rotation portion includes:

[0059] At least two sets of anti-rotation blind holes 4 are provided on the opposing end faces of the two gate plates 1. The anti-rotation blind holes 4 are provided on the two gate plates 1, with each gate plate 1 having at least two anti-rotation blind holes 4. The anti-rotation blind holes 4 on the two gate plates 1 are provided opposite each other. The anti-rotation blind holes 4 of the present application can be provided in two sets, symmetrically with respect to the axis of the gate plate 1.

[0060] The anti-rotation pin 5 is inserted into the anti-rotation blind hole 4. There is no gap between the side wall of the anti-rotation pin 5 and the side wall of the anti-rotation blind hole 4, so as to ensure the matching accuracy between the two gate plates 1.

[0061] In this application, multiple sets of distributed point constraints are used to eliminate the circumferential displacement freedom of the gate 1. The anti-rotation blind hole 4 is machined on the end surface to save radial space and avoid interference with the flow channel.

[0062] In an optional embodiment, the length of the anti-rotation pin 5 is greater than the sum of the maximum gap between the two gate plates 1 and the depth of an anti-rotation blind hole 4, and the length of the anti-rotation pin 5 is less than the sum of the depths of the two mating anti-rotation blind holes 4.

[0063] In this application, the lower limit size ensures that the pin body can still be effectively embedded in the double blind hole at the maximum design gap to prevent the anti-rotation function from failing; the upper limit size ensures that the pin body will not hit the bottom of the blind hole too early during the closing process of the gate plate 1, and reserves the necessary deformation space for the elastic compensation part, so that the anti-rotation pin 5 can fully transmit the torque and allow the gate plate 1 to float slightly under the action of the compensation spring.

[0064] In an optional embodiment, as Figure 1 and Figure 6 As shown, the elastic compensation portion includes:

[0065] The compensation blind holes 6 are cooperatively arranged on the opposite end faces of the two gate plates 1 ; there can be multiple compensation blind holes 6 , and the compensation blind holes 6 and the anti-rotation blind holes 4 can be evenly arranged on the end faces of the gate plates 1 .

[0066] The first spring 7 abuts between the bottom ends of the mutually matching compensation blind holes 6.

[0067] In the present application, the compensation blind holes 6 are arranged in pairs to form a closed cavity, providing guidance and protection for the first spring 7. The first spring 7 abuts the bottom end of the blind hole in both directions, so that the compensation force is transmitted symmetrically along the axis of the gate plate 1, eliminating the risk of the gate plate 1 tilting due to eccentric load. The elastic element is completely built into the gate plate 1 to avoid corrosion from external media and ensure long-term elastic performance stability. The dynamic compression characteristics of the first spring 7 can absorb the thermal expansion and contraction deformation of the valve seat 3 in real time and compensate for the wear of the sealing surface. Compared with rigid compensation, this design significantly reduces the fluctuation of the sealing surface pressure ratio and maintains constant sealing performance under frequent opening and closing conditions.

[0068] In an optional embodiment, as Figure 2 As shown, the mounting portion includes:

[0069] T-shaped groove 8 is provided on the circumferential surface of the gate plate 1, as shown in FIG. Figure 2 As shown, it is provided on the circumferential surface of the upper end of the gate plate 1 and is suitable for detachable connection of the end of the valve stem 2. The T-shaped slot 8 can be provided in an inverted manner on the circumferential surface of the gate plate 1. The shape of the end of the valve stem 2 is adapted to the T-shaped slot 8, so that the T-shaped slot 8 limits the valve stem 2 in the axial direction. It should be noted that the T-shaped slot 8 is divided into two parts, respectively provided on the two gate plates 1. When the two gate plates 1 are arranged opposite each other, they can form a T-shaped slot 8.

[0070] The circumferential surfaces of the lower ends of the two gate plates 1 can be provided with tooling grooves 25. During installation, the tooling grooves 25 on the two gate plates 1 can be tightened by auxiliary tooling, so that the two gate plates 1 are close to each other, making it easier to install them between the valve seats 3. After installation, the auxiliary tooling can be removed from the flow channel of the valve body 9.

[0071] In this application, the T-slot 8 provides three-dimensional mechanical locking of the valve stem 2 end. Its inverted tapered structure creates a self-locking effect, preventing loosening under high-vibration conditions. The shape of the T-slot 8 matches the shape of the valve stem 2 end to ensure lossless transmission of driving force, avoiding the risk of shear failure associated with traditional pin connections. This allows for slight swing of the valve stem 2, eliminating the possibility of gate 1 jamming caused by assembly deviations of the valve stem 2 and improving the system's tolerance to installation errors.

[0072] Example 2

[0073] The present invention also provides a gate valve, comprising:

[0074] The valve body 9 and the valve cover 10 are detachably connected and connected to form a first cavity. The valve body 9 has a flow channel connected to the first cavity. Two valve seats 3 are provided on the flow channel at the connection with the first cavity. A limiting boss 26 can be provided in the flow channel of the valve body 9 to prevent the gate 1 from passing through. Figure 1 As shown, the valve cover 10 is arranged above the valve body 9, and the first cavity is located above the flow channel.

[0075] The gate assembly fixing structure as described above;

[0076] The valve stem 2 passes through the valve cover 10 to the first cavity, and the end portion is connected to the mounting portion of the gate assembly fixing structure;

[0077] The valve stem 2 is suitable for adjusting the relative positions of the gate plate 1 and the valve seat 3 along the length direction, and the gate plate 1 is always in contact with the valve seat 3 .

[0078] In this application, the first cavity provides a sealed space for the movement of the gate 1. The dual valve seats 3 and the dual gates 1 form a bidirectional sealing system, completely eliminating the problem of reverse pressure leakage in valves with a single gate 1. The valve stem 2 extends through the bonnet 10, completely isolating the drive mechanism from the medium and ensuring operational safety. The gate 1 always abuts against the valve seat 3, preventing it from separating and affecting the normal operation of the gate valve.

[0079] In an optional embodiment, a sealing seat 11 is provided on the smooth portion of the valve cover 10, and the valve stem 2 passes through the sealing seat 11 and has an abutment step 12. In the fully open state, the abutment step 12 is sealed with the end face of the sealing seat 11 to limit the valve stem 2, and at this time the gate plate 1 is in contact with the valve seat 3 to prevent the gate plate 1 from completely separating from the sealing surface of the valve seat 3, so that the gate plate 1 is always in contact with the valve seat 3.

[0080] like Figure 1 As shown, the sealing seat 11 is away from the side of the gate 1, and there is a gap between the valve cover 10 and the valve stem 2, and a packing 27, a pressing sleeve 28 and a pressure plate 29 are sequentially arranged from bottom to top. The packing 27 and the pressing sleeve 28 are arranged in the gap, and the pressing sleeve 28 extends out of the gap. The pressure plate 29 is connected to the valve cover 10 by bolts, so that the pressure plate 29 presses the pressing sleeve 28 onto the packing 27. The part of the pressing sleeve 28 extending out of the gap and the pressure plate 29 are both arranged between the two guide rods 18.

[0081] In this application, a sealing seat 11 is provided on the valve cover 10 to form a sealing barrier. When the gate valve is fully open, the sealing engagement between the abutment step 12 and the end face of the sealing seat 11 blocks the axial leakage path of the medium along the valve stem 2, resolving the problem of easy wear of the conventional packing 27. The flat seal formed between the abutment step 12 and the end face of the sealing seat 11 is self-centering and unaffected by the deflection of the valve stem 2.

[0082] In an optional embodiment, a fixing ring 14 is sleeved on the smooth portion of the valve stem 2 , and the gate plate 1 has an accommodating groove 13 to accommodate the fixing ring 14 ; the cross section of the fixing ring 14 may be L-shaped.

[0083] The valve stem 2 is embedded with a split ring assembly, which abuts against the fixing ring 14 and is suitable for limiting the axial position of the fixing ring 14;

[0084] A clamping sleeve 15 is sleeved on the outer side of the split ring assembly. The clamping sleeve 15 has a protrusion 16 facing the valve stem 2. A second spring 17 is provided between the protrusion 16 and the split ring assembly.

[0085] like Figure 2 As shown, the split ring assembly may include a first pair of split rings 30 and a second pair of split rings 31 , wherein the first pair of split rings 30 is located between the second pair of split rings 31 and the fixed ring 14 , and the first pair of split rings 30 abuts against the end surface of the fixed ring 14 ;

[0086] The smooth portion is fitted with the ferrule 15, and the first pair of split rings 30 and the second pair of split rings 31 are both located on the inner surface of the ferrule 15, the protrusion 16 is located between the first pair of split rings 30 and the second pair of split rings 31, and the second spring 17 is located between the protrusion 16 and the second pair of split rings 31, and the protrusion 16 abuts against the first pair of split rings 30 under the action of the second spring 17.

[0087] In this application, the engagement of retaining ring 14 with accommodating groove 13 achieves axial linkage between valve stem 2 and gate plate 1. The split-ring assembly's split structure solves the assembly challenge of valve stem 2. The combination of protrusion 16 on ferrule 15 and second spring 17 prevents the split-ring assembly from separating from valve stem 2 during mechanical vibration. Second spring 17 cushions opening and closing shock loads, preventing rigid impacts caused by mechanical limiters. This ensures stable alignment even under high-temperature creep conditions.

[0088] When the valve is in the closed state, there are gaps between the side walls of the fixing ring 14 and the side walls of the accommodating groove 13, between the bottom end of the fixing ring 14 and the bottom end of the accommodating groove 13, and between the side walls of the T-shaped groove 8 and the end side walls of the valve stem 2. These gaps can compensate for the gate 1 and put the gate 1 in a free state.

[0089] In an optional embodiment, as Figure 4 As shown, the valve stem 2 includes a smooth portion and a threaded portion. The smooth portion has a waist-shaped cross-section. The valve cover 10 is connected to the guide portion. The guide portion includes a guide rod 18, a first guide rib 19 provided on the guide rod 18, and a guide member 20 sleeved on the smooth portion. The edge of the guide member 20 is provided with a guide groove 33. The first guide rib 19 is inserted into the guide groove 33 of the guide member 20. There can be two guide rods 18, and the first guide ribs 19 are respectively provided on the inner side of the guide rod 18, as shown in FIG. Figure 1As shown, the bottom end of the guide rod 18 is connected to the valve cover 10, and the guide member 20 and the valve stem 2 are located between the two guide rods 18. The guide member 20 can be two parts covering the outer surface of the smooth part of the valve stem 2. The shape of the covered part is adapted to the shape of the smooth part, so that the guide member 20 and the valve stem 2 do not rotate relative to each other, and are fixedly connected by bolts. The guide member 20 can be fixedly connected to the valve stem 2, and a mark is set on the guide member 20. The guide rod 18 can be respectively provided with a mark of fully open, half open and closed, which respectively match the mark on the guide member 20 to represent the opening and closing state of the gate valve.

[0090] A second guide rib 32 may be provided in the flow channel of the valve body 9, and a through groove corresponding to the second guide rib 32 may be provided on the circumferential surface of the gate plate 1. The second guide rib 32 is inserted into the through groove to restrict the gate plate 1 within the channel formed by the flow channel and the first cavity, so that its left and right deflection displacement is limited, and the sealing surface of the gate plate 1 does not separate from the valve seat 3, thereby preventing the gate plate 1 from deflecting.

[0091] In the present application, the non-circular fit between the waist-shaped cross-section valve stem 2 and the guide member 20 can completely prevent relative rotation. The sliding pair of the first guide rib 19 embedded in the guide groove 33 strictly limits the movement of the valve stem 2 in the axial direction, and prevents the valve stem 2 from rotating relative to the valve cover 10 and the valve body 9.

[0092] In an optional embodiment, the end of the guide rod 18 is provided with a second cavity, and the threaded portion passes through the second cavity;

[0093] A threaded member 21 is provided in the second cavity. The cross section of the threaded member 21 may be L-shaped, and a through hole is provided inside for the valve stem 2 to pass through. The inner side of the threaded member 21 is provided with a thread that is screwed to the threaded portion of the valve stem 2. The threaded member 21 is screwed to the threaded portion and extends to the outside of the second cavity.

[0094] like Figure 3 As shown, the second cavity has a limiting member 22, which is suitable for limiting the position of the threaded member 21 in the axial direction. The inner side of the second cavity can be provided with a thread, and the outer side of the limiting member 22 can be provided with a thread. The limiting member 22 is screwed to the inner side of the second cavity and limits the bottom end of the threaded member 21 to prevent the threaded member 21 from escaping from the second cavity.

[0095] The portion of the threaded member 21 outside the second cavity is threadedly connected to a handwheel 23 and a lock nut 24. The handwheel 23 is located between the lock nut 24 and the second cavity. The middle portion of the handwheel 23 fits over the outside of the threaded member 21, and the threaded connection between the handwheel 23 and the threaded member 21 is provided with mutually threaded threads. The lock nut 24 is threadedly connected to the end of the threaded member 21 to limit the position of the handwheel 23. A grease nipple may be connected to the second cavity.

[0096] In this application, the stopper 22 prevents the threaded member 21 from being unscrewed. The threaded member 21 extends out of the cavity. When the handwheel 23 and the threaded member 21 rotate relative to each other, the valve stem 2 can be moved axially. The guide member 20 prevents the valve stem 2 from rotating during this movement. The locking nut 24 limits the position of the handwheel 23, ensuring that the handwheel 23 is always threadedly engaged with the threaded member 21.

[0097] This application adopts a parallel double-gate valve 1. The initial sealing pressure ratio between the gate plate 1 and the valve seat 3 is provided by the first spring 7 between the two parallel gate plates 1. A movable anti-rotation pin 5 is provided between the two gate plates 1 to prevent the two gate plates 1 from rotating relative to each other. There is a gap between the anti-rotation pin 5 and the pin hole of the gate plate 1. The length of the anti-rotation pin 5 is shorter than the depth of the anti-rotation blind hole 4 after the two gate plates 1 are fully fitted, that is, the two gate plates 1 can move freely in the axial direction.

[0098] A boss is provided at the bottom of the valve body 9 to prevent the valve from leaking when closed. At the same time, the sealing step on the valve stem 2 fits with the end face of the sealing seat 11 when the valve is opened. Firstly, the limit prevents the gate 1 from being completely separated from the valve seat 3 when the valve is opened and cannot be closed. Secondly, after the sealing seat 11 and the valve stem 2 are sealed, when the packing 27 is damaged, the packing 27 can be replaced online without leakage of the medium.

[0099] A guide portion is provided in the middle position of the valve cover 10 on the upper part of the valve stem 2 to prevent the valve stem 2 from rotating during the opening process of the valve. At the same time, opening and closing position markings corresponding to the position of the guide member 20 can be engraved on the first guide rib 19 or the guide rod 18. Through the guide portion and the opening and closing position markings, it is possible to intuitively see whether the valve is fully closed, fully open or half-open.

[0100] The gate 1 of this application adopts a purely mechanical structure, that is, there is no structure that can be loosened. During pipeline vibration, there is no risk of internal parts falling into the flow channel due to vibration. The gate 1 is movable, that is, it can freely compensate for the non-parallel state of the sealing surface of the valve seat 3. At the same time, when the temperature changes, the gate 1 and the valve seat 3 will not get stuck.

[0101] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A gate assembly fixing structure, characterized in that: include: Two gate plates (1) are arranged opposite to each other and are adapted to adjust their relative positions with respect to the valve seat (3) under the action of the valve stem (2); An anti-rotation portion and an elastic compensation portion are provided on the end surface of the gate plate (1), the anti-rotation portion is suitable for limiting the relative rotation of the two gate plates (1), and the elastic compensation portion is suitable for dynamically compensating the gap between the two gate plates (1), so that the abutment between the gate plate (1) and the valve seat (3) is in a sealed fit; The mounting portion is arranged on the circumferential surface of the gate plate (1) and is suitable for connecting with the valve stem (2).

2. The gate assembly fixing structure according to claim 1, characterized in that: The anti-rotation portion comprises: Anti-rotation blind holes (4), at least two groups, are cooperatively arranged on the opposite end faces of the two gate plates (1); The anti-rotation pin (5) is plugged into the anti-rotation blind hole (4) that matches each other.

3. The gate assembly fixing structure according to claim 2, characterized in that: The length of the anti-rotation pin (5) is greater than the sum of the maximum gaps between the two gate plates (1) and the depth of an anti-rotation blind hole (4), and the length of the anti-rotation pin (5) is less than the sum of the depths of the two mutually matched anti-rotation blind holes (4).

4. The gate assembly fixing structure according to claim 1, characterized in that: The elastic compensation portion includes: Compensating blind holes (6) are cooperatively arranged on opposite end faces of the two gate plates (1); The first spring (7) abuts between the bottom ends of the mutually matched compensation blind holes (6).

5. The gate assembly fixing structure according to claim 1, characterized in that: The mounting portion includes: A T-shaped groove (8) is provided on the circumferential surface of the gate plate (1) and is suitable for detachable connection of the end of the valve stem (2).

6. A gate valve, characterized in that: include: The valve body (9) and the valve cover (10) are detachably connected and connected to form a first cavity. The valve body (9) has a flow channel communicating with the first cavity. Two valve seats (3) are provided on the flow channel at a position communicating with the first cavity. The gate assembly fixing structure according to any one of claims 1 to 5; A valve stem (2) passes through the valve cover (10) to the first cavity, and an end portion is connected to a mounting portion of the gate assembly fixing structure; The valve stem (2) is suitable for adjusting the relative position of the gate plate (1) and the valve seat (3) along the length direction, and the gate plate (1) is always in contact with the valve seat (3).

7. The gate valve according to claim 6, characterized in that The valve cover (10) is provided with a sealing seat (11), the valve stem (2) passes through the sealing seat (11) and has an abutting step (12), and in the fully open state, the abutting step (12) is in sealing cooperation with the end face of the sealing seat (11).

8. The gate valve according to claim 6, characterized in that The valve stem (2) is sleeved with a fixing ring (14), and the gate plate (1) has a receiving groove (13) for accommodating the fixing ring (14); The valve stem (2) is embedded with a split ring assembly, which abuts against the fixed ring (14) and is suitable for axially limiting the fixed ring (14); The outer side of the split ring assembly is provided with a clamping sleeve (15), the clamping sleeve (15) has a protrusion (16) facing the valve stem (2), and a second spring (17) is provided between the protrusion (16) and the split ring assembly.

9. The gate valve according to claim 6, characterized in that The valve stem (2) includes a smooth portion and a threaded portion, the smooth portion has a waist-shaped cross-section, the valve cover (10) is connected to a guide portion, the guide portion includes a guide rod (18), a first guide rib (19) arranged on the guide rod (18), and a guide member (20) mounted on the smooth portion, the first guide rib (19) being plugged into the guide member (20).

10. The gate valve according to claim 9, characterized in that A second cavity is provided at the end of the guide rod (18), and the threaded portion passes through the second cavity; A threaded member (21) is provided in the second cavity, and the threaded member (21) is screwed onto the threaded portion and extends to the outside of the second cavity; The second cavity has a limiting member (22), and the limiting member (22) is suitable for limiting the position of the threaded member (21) in the axial direction; The portion of the threaded member (21) located outside the second cavity is threadedly connected to a hand wheel (23) and a locking nut (24), and the hand wheel (23) is located between the locking nut (24) and the second cavity.

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