High-temperature wear-resistant double-gate-plate corundum control gate valve with flow guide lining

Abstract

A high-temperature wear-resistant double-gate-plate control gate valve with flow guide lining corundum comprises a valve body and a valve cover, a valve rod and a valve seat are arranged in the valve body, the valve rod is connected with gate plates, the gate plates are matched with the valve seat in a sealing mode, a flow channel of the valve body is lined with corundum, flow guide holes are formed in the bottoms of the gate plates, the flow guide holes are lined with corundum, and a middle cavity is further formed in the bottom of the flow channel of the valve body. The flow guide hole comprises an opening position and a closing position, the opening position is aligned with the flow channel of the valve body, lining corundum on the flow channel and the flow guide hole forms a complete corundum straight pipeline, and the closing position is formed when the flow guide hole descends into the middle cavity along with the flashboard and the sealing face of the flashboard is matched with the valve seat in a sealing mode. When the gate plate is in the opening position, the gate plate is completely attached to the sealing face of the valve seat, the flow guide hole is completely aligned with the flow channel hole of the valve body, and when the whole valve is in the opening state, the flow channel forms a straight pipeline completely lined with corundum and is particularly resistant to abrasion and scouring, the situation that the flow channel is damaged by scouring is completely avoided, and the service life of the valve is prolonged. And the sealing surface of the valve body and the sealing surface of the flashboard are protected from being washed when the valve is opened.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a high-temperature wear-resistant double gate valve with a corundum-lined guide plate. Background Technology

[0002] High-temperature wear-resistant corundum-lined gate valves are mainly used in the secondary and tertiary cyclone flue gas pipelines of the petroleum and petrochemical heavy catalyst production workshop. These pipelines operate at temperatures ranging from 500 to 700°C, and the flue gas contains a large amount of catalyst particles, causing severe wear on the pipelines. The pipelines are lined with wear-resistant and high-temperature resistant materials to prevent wear through. A common problem with valves in this section is that the valve body is worn through by the high-temperature catalyst, and the sealing surface is quickly damaged, rendering the valve ineffective and causing complete valve failure. This disrupts the normal operation of the entire production system and reduces production efficiency. Gate valves are commonly used in this section, but when a gate valve is opened, the valve seat sealing surface is directly exposed to the high-speed flue gas containing catalyst particles, causing the sealing surface to be quickly eroded and rendered ineffective. The high-temperature, high-speed catalyst particle flow is comparable to water jet cutting, quickly damaging the metal and causing the valve to completely fail.

[0003] In response to the above operating conditions, and especially under high-temperature and high-wear conditions, a high-temperature wear-resistant corundum material is used to line the valve flow channel to prevent the flue gas containing high-temperature catalyst particles from wearing through the valve body flow channel. However, to address the issue of the valve body sealing surface being rapidly eroded and cut off after the valve is opened, a flat plate valve structure with a guide hole is adopted. However, due to the high-temperature sealing requirements of ordinary flat plate gate valves between the moving valve seat and the valve body, and the high hardness of the high-temperature catalyst particles causing significant wear to the valve body and flow channel, ordinary flat plate gate valves also cannot meet the stringent requirements of this operating condition. The problems that need to be solved are: ensuring the valve body flow channel is high-temperature wear-resistant; preventing the valve body, valve seat, and gate sealing surfaces from being directly eroded and worn by the medium; and ensuring proper sealing under high-temperature conditions. Summary of the Invention

[0004] To address the technical deficiencies of existing technologies, this invention provides a high-temperature wear-resistant double-gate control gate valve with a flow guide and corundum lining.

[0005] The technical solution adopted in this invention is: a high-temperature wear-resistant double-gate control valve with a corundum-lined guide, comprising a valve body and a valve cover. The valve body is provided with a valve stem and a valve seat. A gate frame and a gate are connected to the valve stem. The gate and the valve seat are sealed together. The flow channel of the valve body is lined with corundum. The bottom of the gate is provided with a guide hole, which is also lined with corundum. The bottom of the flow channel of the valve body is also provided with a central cavity. The guide hole includes an open position in which it is aligned with the flow channel of the valve body, and the corundum lining on the flow channel and the guide hole forms a complete corundum straight pipe. It also includes a closed position in which the guide hole descends into the central cavity as the gate descends, and the sealing surface of the gate seals with the valve seat.

[0006] The gate includes a left gate and a right gate. The right gate extends downward to form a guide hole. The outer cylindrical surface of the right gate slides into contact with the inner cylindrical surface of the left gate, so that the right gate and the left gate are assembled into a linked whole.

[0007] The bottom mating surfaces of the left and right gates are also provided with guide holes and butterfly springs.

[0008] A gate frame is provided between the left and right gates. The front end of the gate frame is wedge-shaped. Two circular holes are opened on the two surfaces of the gate frame that are perpendicular to the wedge surface. A through keyway is milled at the upper end of one of the circular holes. An inclined column is installed in the circular hole with the keyway. A spherical top core is installed in the other circular hole without the keyway. There are gaps between the spherical top core, the inclined column, and the circular holes. When the gate frame moves downward, it pushes the inclined column and the spherical top core, which in turn pushes the inclined surfaces on the left and right gates. Then, the inclined surface of the inclined column contacts the ball head of the spherical top core to form a spherical-plane fit.

[0009] The valve stem and the gate frame are connected by threads and secured by a bolt and a cotter pin.

[0010] A butterfly spring is provided between the head of the valve stem and the gate, and a washer is provided between the butterfly spring and the gate. The valve stem transmits force to the gate through the washer at the bottom of the butterfly spring, pushing the gate downward at the same time.

[0011] The gate frame is further provided with L-shaped limiting blocks between the left gate and the right gate. The L-shaped limiting blocks are fixed to the gate frame with screws. The L-shaped limiting blocks are in contact with the grooves formed between the gate frame and the left and right gates, which firmly hook the left and right gates together and prevent the left and right gates from separating horizontally when they are in the "only" state.

[0012] The height of the inclined column platform and the spherical top core inside the circular hole is higher than the wedge surface of the front wedge of the gate frame.

[0013] Both the valve cover and the valve body are equipped with purge valves in their central cavities.

[0014] The beneficial effects of this invention are as follows: This invention provides a high-temperature wear-resistant double-gate control gate valve with corundum-lined flow guide, including a valve body and a valve cover. The valve body contains a valve stem and a valve seat. A gate and a gate holder are connected to the valve stem. The gate and valve seat are in a sealing fit. The flow channel of the valve body is lined with corundum. The bottom of the gate has a flow guide hole lined with corundum. The bottom of the flow channel of the valve body also has a central cavity. The flow guide hole includes an open position where it aligns with the flow channel of the valve body, and the corundum lining on the flow channel and the flow guide hole forms a completely straight corundum pipe. There is also a closed position where the flow guide hole descends into the central cavity as the gate descends, and the sealing surface of the gate seals with the valve seat. Through the corundum lining of the gate's flow guide hole, after the valve is opened, a butterfly spring pre-tightens the left and right gates, ensuring complete contact between the sealing surfaces of the gate and valve seat in the open position. The flow guide hole is completely aligned with the flow channel hole of the valve body. In the entire open state, the flow channel forms a completely straight pipe lined with corundum, exhibiting exceptional wear and erosion resistance. It completely protects the flow channel from being eroded and also protects the valve body sealing surface and gate sealing surface from being eroded when the valve is open. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the left gate structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the right gate structure of the present invention.

[0018] Figure 4 This is a schematic diagram of the gate frame structure of the present invention.

[0019] Figure 5 This is a schematic diagram of the valve body in the closed state of the present invention.

[0020] Figure 6 This is a schematic diagram of the valve body in the open state of the present invention. Among them, 1-valve body, 2-valve cover, 3-valve stem, 4-gate, 5-gate frame, 6-corundum, 7-purge valve, 41-guide hole, 42-left gate, 43-right gate, 44-guide hole butterfly spring, 51-round hole, 52-slanted column, 53-spherical top core, 54-butterfly spring, 55-washer, 56-L-shaped limit block. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A high-temperature wear-resistant double-gate control gate valve with a corundum-lined flow guide includes a valve body 1 and a valve cover 2. The valve body 1 contains a valve stem 3 and a valve seat. A gate 4 is connected to the valve stem 3, and the gate 4 is sealed to the valve seat. The flow channel of the valve body 1 is lined with high-temperature and wear-resistant corundum 6, ensuring its resistance to erosion and wear. The bottom of the gate 4 has a flow guide hole 41, which is lined with corundum 6. The bottom of the flow channel of the valve body 1 also has a central cavity. The flow guide hole 41 includes an open position where it is aligned with the flow channel of the valve body 1, and the flow channel and the corundum 5 lining on the flow guide hole 41 form a complete straight corundum 5 pipe; and a closed position where the flow guide hole 41 descends into the central cavity as the gate 4 descends, and the sealing surface of the gate 4 seals with the valve seat. It is exceptionally wear-resistant and erosion-resistant, completely protecting the flow channel from damage caused by erosion, and also protecting the valve body sealing surface and gate sealing surface from erosion when the valve is open.

[0023] The gate 4 includes a left gate 42 and a right gate 43. The right gate 43 extends downward to form a guide hole 41. The outer cylindrical surface of the right gate 43 slides with the inner cylindrical surface of the left gate 42, so that the right gate 43 and the left gate 42 are assembled into a linked whole.

[0024] The bottom mating surfaces of the left gate plate 42 and the right gate plate 43 are also provided with guide hole butterfly springs 44, so that when the left and right gate plate assemblies are in the fully open position, there is a positive pressure pressing on the sealing surfaces of the gate plate and the valve seat, forming a fully fitted state. At this time, it prevents particles and airflow from entering between the sealing surfaces and also prevents high-speed airflow from scouring the sealing pair, thus effectively protecting the sealing surfaces.

[0025] A gate frame 5 is provided between the left gate plate 4 and the right gate plate 4. The front end of the gate frame 5 is wedge-shaped. Two circular holes 51 are opened on two surfaces of the gate frame 5 that are perpendicular to the wedge surface. A through keyway is milled on the upper end of one side of one of the circular holes 51. An inclined column 52 is installed in the circular hole 51 with the keyway. A spherical top core 53 is installed in the other circular hole 51 without the keyway. There are gaps between the spherical top core, the inclined column, and the circular holes 51 to allow the inclined column and the spherical top core to have a certain swing space when the gate frame is pushed. When the gate frame 5 moves downward, it pushes the inclined column and the spherical top core, which in turn pushes the inclined surfaces on the left and right gate plates 4. Then, the inclined surface of the inclined column contacts the ball head of the spherical top core to form a spherical surface and a plane. The adjustable rotational freedom allows the left and right gates to freely rotate and align with the valve body and seat planes. This facilitates compensation for insufficient parallelism between the two valve seat sealing surfaces, which could lead to a leak, and reduces the machining tolerance requirements for the metal sealing surfaces. This structure achieves a complete seal as long as the flatness of the valve seat and gate sealing surfaces is ensured. Since the sealing surfaces of the valve seat and gate are machined using the same grinding fixture or surface grinder, flatness is easily controlled. Therefore, this design ensures a tight seal when the valve is closed and improves manufacturing efficiency. The zero-leakage sealing performance in the closed state also prevents the cutting effect of high-hardness catalyst particles from leaking into the sealing surfaces during closure, ensuring a long valve lifespan.

[0026] The valve stem 3 and the gate frame 5 are connected by threads and are secured by bolts and cotter pins, making the gate frame and valve stem a rigid whole.

[0027] A butterfly spring 54 is provided between the head of the valve stem 3 and the gate plate 4. A washer 55 is provided between the butterfly spring and the gate plate 4. The valve stem 3 transmits force to the gate plate 4 through the washer at the bottom of the butterfly spring, pushing the gate plate 4 downward. An L-shaped limiting block 56 is provided between the gate frame 5 and the left gate plate 42 and the right gate plate 43 respectively. The L-shaped limiting block is fixed to the gate frame 5 with screws. The L-shaped limiting block and the groove formed between the gate frame 5 and the left and right gate plates 4 make contact and fit, firmly hooking the left and right gate plates together to move upward and preventing the left and right gate plates from disengaging in the free state.

[0028] The height of the inclined column and the spherical top core inside the circular hole 51 is higher than the wedge surface of the front wedge of the gate frame 5, which avoids contact between the wedge surface of the gate frame and the gate, ensures that the spherical and planar contact of the inclined column and the spherical top core transmits the force that opens the left and right gates, and also ensures a certain degree of freedom for the left and right gates when they are driven on the spherical and planar surfaces, so as to automatically align the sealing effect of the sealing pair.

[0029] Both the valve cover 2 and the valve body 1 are equipped with purge valves 7, which can be connected to purge pipes for maintenance when maintenance is required.

[0030] The valve closing process of this invention is as follows: The actuator drives the valve stem to move downwards. Since the valve stem and gate frame are connected by threads and secured with pins and cotter pins, the gate frame and valve stem form a rigid whole. At this time, the valve stem head compresses the disc spring assembly, and the force is transmitted to the left and right gates through the large washer at the bottom of the disc spring, pushing the left and right gates downwards simultaneously until the bottoms of the left and right gates reach the small circular platform at the bottom of the valve body. The gates can no longer move downwards, and the valve stem continues to compress the disc spring assembly at the valve stem head, causing the gate frame assembly to move downwards together. Because the front end of the gate frame is wedge-shaped and equipped with an inclined frustum and a spherical core, whose heights are higher than the wedge surface at the front end of the gate frame, the inclined frustum and spherical core first contact the inclined surfaces of the left and right gates, pushing them to move to both sides, generating a large pre-tightening sealing force, which can form a forced sealing effect. Regardless of the direction from which the medium enters, a completely zero-leakage seal can be formed at the outlet end, so this valve also has a completely bidirectional sealing effect.

[0031] The opening process is as follows: The valve moves from the closed to the open state. First, the actuator drives the valve stem upwards, which in turn moves the gate frame upwards. At this time, the spherical top core and wedge platform at the front end of the gate frame disengage from the inclined surfaces of the left and right gates and move upwards, causing the left and right L-shaped limit blocks installed on the gate frame steps to move upwards. The two grooves formed by the L-shaped limit blocks and the gate frame engage with the two grooves of the left and right gates, firmly hooking the left and right gates together and moving them upwards. Through the upper sealing conical surface design on the valve stem, it is ensured that when the gate guide hole aligns with the valve body flow channel hole, the upper seal and the valve cover upper seal fit perfectly, completing the valve opening. When the valve is in the open or closed position, no medium enters the intermediate cavity. However, a small amount of medium may enter the intermediate cavity during opening and closing. To prevent dust and slag accumulation in the intermediate cavity after prolonged and frequent operation, purge valves are installed on the valve cover and valve body. A purge pipe can be connected for maintenance operations when necessary.

[0032] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of patent protection of this patent.

[0033] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature wear-resistant double-gate control gate valve with a guide and corundum lining, comprising a valve body (1) and a valve cover (2), wherein the valve body (1) is provided with a valve stem (3) and a valve seat, a gate (4) is connected to the valve stem (3), the gate (4) is sealed to the valve seat, and the flow channel of the valve body (1) is lined with corundum (6), characterized in that, The bottom of the gate (4) is provided with a guide hole (41), the guide hole (41) is lined with corundum (6), the bottom of the flow channel of the valve body (1) is also provided with a middle cavity, the guide hole (41) includes an open position where it is aligned with the flow channel of the valve body (1), and the corundum (5) lining the flow channel and the guide hole (41) forms a complete corundum (5) straight pipe, and the guide hole (41) is closed position where the guide hole (41) descends into the middle cavity as the gate (4) descends, and the sealing surface of the gate (4) seals with the valve seat.

2. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 1, characterized in that, The gate (4) includes a left gate (42) and a right gate (43). The right gate (43) extends downward to form a guide hole (41). The outer cylindrical surface of the right gate (43) slides with the inner cylindrical surface of the left gate (42) so that it is assembled with the left gate (42) into a linked whole.

3. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 2, characterized in that, The bottom mating surfaces of the left gate (42) and right gate (43) are also provided with guide hole butterfly springs (44).

4. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 2, characterized in that, A gate frame (5) is provided between the left gate (4) and the right gate (4). The front end of the gate frame (5) is wedge-shaped. Two round holes (51) are opened on the two surfaces of the gate frame (5) that are perpendicular to the wedge surface of the wedge. A through keyway is milled on the upper end of one side of one of the round holes (51). An inclined column (52) is installed in the round hole (51) with the keyway. A spherical top core (53) is installed in the other round hole (51) without the keyway. There is a gap between the spherical top core, the inclined column and the round hole (51). When the gate frame (5) moves downward, it pushes the inclined column and the spherical top core, and then pushes the inclined surfaces on the left and right gates (4). Then, the inclined surface of the inclined column contacts the ball head of the spherical top core to form a spherical surface and a plane.

5. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 4, characterized in that, The valve stem (3) is connected to the gate frame (5) by a thread and is secured by a bolt and a cotter pin.

6. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 5, characterized in that, A butterfly spring (54) is provided between the head of the valve stem (3) and the gate (4), and a washer (55) is provided between the butterfly spring and the gate (4). The valve stem (3) transmits force to the gate (4) through the washer at the bottom of the butterfly spring, and pushes the gate (4) downward at the same time.

7. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 4, characterized in that, The gate frame (5) is provided with L-shaped limiting blocks (56) between the left gate (42) and the right gate (43). The L-shaped limiting blocks are fixed to the gate frame (5) by screws. The L-shaped limiting blocks are in contact with the grooves formed between the gate frame (5) and the left and right gates (4), which firmly hook the left and right gates together and move them upward, and prevent the left and right gates from separating horizontally when in a free state.

8. The high-temperature wear-resistant double-gate control valve with flow guide and corundum lining according to claim 4, characterized in that, The height of the inclined column and the spherical top core inside the circular hole (51) is higher than the wedge surface of the front end of the gate frame (5).

9. The high-temperature wear-resistant double-gate control valve with flow guide corundum lining according to claim 1, characterized in that, Both the valve cover (2) and the valve body (1) are equipped with purge valves (7) in their central cavities.

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