Purging-resistant temporary flushing valve capable of being rapidly repaired on line

Abstract

The invention relates to the technical field of temporary flushing valves, and particularly discloses an on-line rapid repair anti-purging temporary flushing valve which comprises a valve body and a valve pipe, the valve pipe is installed at the bottom end of the valve body, a sliding hole is formed in the inner bottom of the valve body, and the valve pipe and the valve body are communicated with each other through the sliding hole; an annular mounting groove is formed in the position, below the sliding hole, of the inner wall of the valve pipe, a first valve seat and a second valve seat are mounted at the two ends of the interior of the mounting groove correspondingly, an arc-shaped clamping groove is formed in the side, close to the second valve seat, of the inner bottom of the mounting groove, and a valve plate is slidably mounted between the first valve seat and the second valve seat. The side, close to the second valve seat, of the valve plate is sleeved with an oval throttling ring, the bottom end of the throttling ring is located in the clamping groove, and the side, away from the valve plate, of the throttling ring abuts against the second valve seat. The throttle ring on the air inlet side has hysteresis relative to the valve plate when being opened, so that friction to the valve plate and the first valve seat is reduced when steam circulates.

Description

Technical Field

[0001] The present invention relates to the technical field of flushing valves, and in particular to an anti-purge flushing valve that can be quickly repaired online. Background Art

[0002] Steam purging is a critical step before a new unit is officially commissioned. Before the unit is officially put into operation, the superheater, reheater, and related pipelines must be steam purged to remove debris such as welding slag, sand, gravel, and rust that may have fallen or remained in the pipelines during construction. This ensures that the steam quality entering the steam turbine meets system requirements, avoids damage to the turbine, and ensures safe operation of the unit. During steam purging, a temporary valve is installed on the temporary pipeline, and a test target plate is installed at an appropriate location downstream of the valve. Steam is used as the power source to control the opening and closing of the valve to purge the target pipeline.

[0003] During the operation of the Linchong Valve, high-temperature steam carries impurity particles in the pipeline and flows through the narrow crescent-shaped section formed by the valve seat and the valve plate at an extremely high flow rate. Under the erosion of the high-speed airflow and the impact and friction of the impurity particles, the valve plate and the bottom of the valve seat are easily damaged, resulting in failure of the entire sealing surface and inability to repair on site, causing a short-board effect on the entire valve. The valve can only be cut off from the temporary pipeline and returned to the factory for repair, which seriously affects the construction period. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an anti-purge impending valve that can be quickly repaired online.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A purge-resistant impending valve that can be quickly repaired online comprises a valve body and a valve pipe, wherein the valve pipe is mounted on the bottom end of the valve body, a sliding hole is provided on the inner bottom of the valve body, the valve pipe and the valve body are connected to each other through the sliding hole, an annular mounting groove is provided on the inner wall of the valve pipe below the sliding hole, a first valve seat and a second valve seat are respectively mounted on both ends of the inner part of the mounting groove, an arc-shaped clamping groove is provided on the side of the inner bottom of the mounting groove close to the second valve seat, a valve plate is slidably mounted between the first valve seat and the second valve seat, an elliptical throttling ring is sleeved on the side of the valve plate close to the second valve seat, the bottom end of the throttling ring is located inside the clamping groove, and the side of the throttling ring away from the valve plate abuts against the second valve seat.

[0007] Preferably, the top end of the valve plate passes through the interior of the valve body through a sliding hole and is installed with a concave connecting block. Limiting grooves are provided on the inner walls on both sides of the installation groove below the sliding hole. Fixed plates are installed on the outer walls on both sides of the valve plate. The fixed plates are slidably installed inside the limiting grooves. The opposing surfaces of the first valve seat and the valve plate are provided with mutually matching inclined surfaces.

[0008] Preferably, several detection plates are installed on the inner walls of both ends of the valve tube in the length direction, placement grooves are provided on both sides of the top of the valve body, and limiting holes are provided on the inner walls of the placement grooves in the length direction. A display screen is installed inside the placement groove, and several connecting rods are installed on the inner bottom of the placement groove. The connecting rods and the detection plates are electrically connected to each other, and the bottom of the display screen is provided with several slots matching the connecting rods.

[0009] Preferably, a plurality of screw holes are provided on the side of the throttle ring, and the screw holes pass through the side of the throttle ring and the valve plate. The internal threads of the screw holes are installed with a first bolt. An annular groove is provided on the inner wall of the screw hole on the throttle ring near one end of the valve plate, and a disc spring is installed inside the groove. The disc spring is movably installed on the outer wall of the first bolt.

[0010] Preferably, a support plate is installed on the top of the valve body, a valve cover is installed on the bottom of the support plate, the valve cover is located inside the valve body, a fixing sleeve is installed on the top of the support plate, a bracket is installed on the top of the support plate, and the bottom end of the bracket is slidably installed on the outer wall of the fixing sleeve.

[0011] Preferably, a through hole is provided at the bottom of the valve cover, the through hole passes through the valve cover and the support plate, and is communicated with the interior of the fixed sleeve. A fixing groove matching the connecting block is provided on the inner wall of the bottom end of the through hole, and a valve stem is movably installed in the through hole, and the bottom end of the valve stem is rotatably connected to the connecting block.

[0012] Preferably, a plurality of second bolts are installed on the inner bottom of the bracket, the bottom ends of the second bolts pass through the bracket, the support plate and the top of the valve body, a threaded sleeve is installed on the top of the bracket, the threaded sleeve is threadedly installed on the top outer wall of the valve stem, and a handwheel is installed on the top of the valve stem.

[0013] Preferably, an annular groove is provided on the inner wall of the fixing sleeve, the top of the annular groove passes through the fixing sleeve, a stuffing pad is installed on the inner bottom of the annular groove, a stuffing pad is installed on the top of the stuffing pad, a stuffing pressing sleeve is installed on the top of the stuffing, and the top of the stuffing pressing sleeve passes through the annular groove.

[0014] Preferably, a packing pressure plate is installed on the top of the annular groove, and the packing pad, packing, packing sleeve and packing pressure plate are all annular and are movably installed on the outer wall of the valve stem.

[0015] Preferably, a plurality of third bolts are installed on the top of the packing pressure plate, and the bottom ends of the third bolts pass through the top of the packing pressure plate and the fixing sleeve, and the top end of the fixing sleeve and the packing pressure plate are both located inside the bracket.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] When the throttle ring is opened, the throttle body is in the airtight position, and the throttle body is in the airtight position, so that the throttle body is in the airtight position, and the throttle body is in the airtight position.

[0018] When the throttle ring cooperates with the mounting groove to cut off the steam flow, the valve plate abuts against the inner bottom of the mounting groove to completely close the interior of the valve tube. The throttle ring and the valve plate are flexibly connected by a disc spring and a first bolt, so that the thickness of the valve plate has a certain elastic expansion, which can compensate for the manufacturing error of the valve plate during use, and absorb the linear expansion of the valve plate during hot operation inside the valve tube, thereby effectively eliminating the risk of the valve plate locking.

[0019] In the present invention, the staff connects and fixes the bracket, support plate and the top of the valve body through several second bolts. When the valve plate or throttle ring is damaged during use and needs to be repaired or replaced, the staff can quickly remove the bracket, support plate and valve cover by removing the second bolts, and quickly take out the valve plate and throttle ring for repair or replacement through the valve stem. When multiple purges fail, the support plate and bracket can be disassembled online, the valve plate and throttle ring can be taken out, and a new throttle ring can be quickly and conveniently replaced without completely disassembling the valve from the temporary pipeline.

[0020] In the present invention, the staff can understand the situation inside the valve pipe and the temporary pipeline in real time through the display screen, so that the staff can more accurately determine the operation timing when the valve plate is raised and lowered, and prevent the air pressure from being too low to achieve a good purging effect, and also prevent the air pressure from being too high to cause damage to the temporary pipeline and the valve pipe. During use, the staff can install and disassemble the display screen at any time. When the staff needs to understand the interior of the temporary pipeline and the valve pipe, the display screen is placed in the placement groove and lightly pressed to connect the display screen and the connecting rod to each other, so that the interior of the temporary pipeline can be understood through the display screen. When the staff does not need to understand the interior of the temporary pipeline, the display screen can be directly pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of an anti-purge flushing valve that can be quickly repaired online, proposed by the present invention;

[0022] Figure 2 This is a cross-sectional view of the valve body of an anti-purge and impending flush valve that can be quickly repaired online, as proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the valve tube of an anti-purge impending valve that can be quickly repaired online, proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the partial structure of the valve pipe of an anti-purge impending valve that can be repaired online quickly, as proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the installation structure of a throttle ring of an anti-purge flushing valve that can be repaired online quickly, as proposed by the present invention;

[0026] Figure 6 This is a schematic diagram of the throttle ring structure of an anti-purge impending valve that can be quickly repaired online, as proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the valve body structure of an anti-purge impending valve that can be quickly repaired online, as proposed by the present invention;

[0028] Figure 8 This is a schematic diagram of the support installation structure of an anti-purge flushing valve that can be repaired online quickly, as proposed by the present invention;

[0029] Figure 9 This is a cross-sectional view of a fixing sleeve of an anti-purge impending valve that can be quickly repaired online, as proposed by the present invention.

[0030] In the figure: 1. valve body; 2. valve pipe; 3. support plate; 4. bracket; 5. threaded sleeve; 6. handwheel; 7. valve stem; 8. placement groove; 9. limiting hole; 10. detection plate; 11. first bolt; 12. valve plate; 13. throttling ring; 14. first valve seat; 15. second valve seat; 16. valve cover; 17. sliding hole; 18. limiting groove; 19. display screen; 20. mounting groove; 21. card slot; 22. connecting block; 23. second bolt; 24. fixing plate; 25. groove; 26. disc spring; 27. connecting rod; 28. fixing groove; 29. ​​third bolt; 30. fixing sleeve; 31. annular groove; 32. packing pad; 33. packing; 34. packing press sleeve; 35. packing press plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] Reference Figure 1-9 , an anti-purge impending valve that can be quickly repaired online, includes a valve body 1 and a valve pipe 2, the valve pipe 2 is installed at the bottom end of the valve body 1, and a sliding hole 17 is opened in the inner bottom of the valve body 1. The valve pipe 2 and the valve body 1 are connected to each other through the sliding hole 17, and an annular mounting groove 20 is opened on the inner wall of the valve pipe 2 below the sliding hole 17. The first valve seat 14 and the second valve seat 15 are respectively installed at both ends of the inner part of the mounting groove 20, and an arc-shaped clamping groove 21 is provided on the side of the inner bottom of the mounting groove 20 close to the second valve seat 15. A valve plate 12 is slidably installed between the first valve seat 14 and the second valve seat 15, and an elliptical throttling ring 13 is sleeved on the side of the valve plate 12 close to the second valve seat 15. The bottom end of the throttling ring 13 is located inside the clamping groove 21, and the side of the throttling ring 13 away from the valve plate 12 abuts against the second valve seat 15.

[0034] As a technical optimization solution of the present invention, the top end of the valve plate 12 passes through the interior of the valve body 1 through the sliding hole 17 and is installed with a concave connecting block 22. Limiting grooves 18 are provided on the inner walls on both sides of the installation groove 20 below the sliding hole 17. Fixed plates 24 are installed on the outer walls on both sides of the valve plate 12. The fixed plates 24 are slidably installed inside the limiting grooves 18. The opposing surfaces of the first valve seat 14 and the valve plate 12 are provided with mutually cooperating inclined surfaces. The use of an asymmetric valve plate 12 allows the valve plate 12 to still be lifted and lowered well while also cooperating with the inclined surface on the first valve seat 14, making the valve plate 12 more stable when moving downward.

[0035] As a technical optimization solution of the present invention, several detection plates 10 are installed on the inner walls of both ends of the valve tube 2 in the length direction, placement grooves 8 are opened on both sides of the top of the valve body 1, and limiting holes 9 are opened on the inner wall of the placement groove 8 in the length direction. A display screen 19 is installed inside the placement groove 8, and several connecting rods 27 are installed on the inner bottom of the placement groove 8. The connecting rods 27 are electrically connected to the detection plates 10, and the bottom of the display screen 19 is provided with several slots matching the connecting rods 27; when in use, the several detection plates 10 include air pressure detection plates, temperature detection plates and air flow rate detection plates, which can understand the status of the valve tube 2 and the temporary pipeline in real time.

[0036] As a technical optimization solution of the present invention, a plurality of screw holes are provided on the side of the throttle ring 13, and the screw holes pass through the sides of the throttle ring 13 and the valve plate 12. The internal threads of the screw holes are installed with the first bolt 11. An annular groove 25 is provided on the inner wall of the screw hole on the throttle ring 13 near one end of the valve plate 12, and a disc spring 26 is installed inside the groove 25. The disc spring 26 is movably installed on the outer wall of the first bolt 11; when the throttle ring 13 is in use, when the valve plate 12 moves upward, it can block the flow of gas inside the pipeline when the gap between the valve plate 12 and the bottom end of the inner wall of the valve tube 2 is small, until the gap between the valve plate 12 and the bottom end of the inner wall of the valve tube 2 increases to a specified size, allowing the airflow to flow through the gap, which can provide better protection for the valve plate 12 and the two valve seats.

[0037] As a technical optimization solution of the present invention, a support plate 3 is installed on the top of the valve body 1, and a valve cover 16 is installed on the bottom of the support plate 3. The valve cover 16 is located inside the valve body 1, and a fixing sleeve 30 is installed on the top of the support plate 3. A bracket 4 is installed on the top of the support plate 3, and the bottom end of the bracket 4 is slidably installed on the outer wall of the fixing sleeve 30; when in use, the bracket 4 can provide better protection for the top of the fixing sleeve 30, and the fixing sleeve 30 can also better limit the installation position of the bracket 4.

[0038] As a technical optimization solution of the present invention, a through hole is provided at the bottom of the valve cover 16, which passes through the valve cover 16 and the support plate 3, and is interconnected with the interior of the fixed sleeve 30. A fixing groove 28 matching the connecting block 22 is provided on the inner wall of the bottom end of the through hole, and a valve stem 7 is movably installed in the through hole, and the bottom end of the valve stem 7 is rotatably connected to the connecting block 22; when in use, the staff can drive the valve plate 12 to move up and down through the valve stem 7 to switch and start the circulation inside the valve pipe 2.

[0039] As a technical optimization solution of the present invention, a plurality of second bolts 23 are installed at the inner bottom of the bracket 4, and the bottom ends of the second bolts 23 pass through the bracket 4, the support plate 3 and the top of the valve body 1. A threaded sleeve 5 is installed at the top of the bracket 4, and the threaded sleeve 5 is threadedly installed on the top outer wall of the valve stem 7. A handwheel 6 is installed at the top of the valve stem 7; the staff can use the handwheel 6 to drive the valve stem 7 and the threaded sleeve 5 to rotate with each other, and drive the valve stem 7 to move up and down to a specified height through the threaded connection.

[0040] As a technical optimization solution of the present invention, an annular groove 31 is opened on the inner wall of the fixed sleeve 30, the top of the annular groove 31 passes through the fixed sleeve 30, a stuffing pad 32 is installed on the inner bottom of the annular groove 31, a stuffing 33 is installed on the top of the stuffing pad 32, a stuffing press sleeve 34 is installed on the top of the stuffing 33, and the top of the stuffing press sleeve 34 passes through the annular groove 31; the stuffing pad 32 and the stuffing 33 can seal the gap between the inner wall of the fixed sleeve 30 and the outer wall of the valve stem 7 when in use.

[0041] As a technical optimization solution of the present invention, a packing pressure plate 35 is installed on the top of the annular groove 31. The packing pad 32, packing 33, packing pressure sleeve 34 and packing pressure plate 35 are all annular and are movably installed on the outer wall of the valve stem 7; the packing pad 32, packing 33 and packing pressure plate 35 can not only seal the gap between the outer wall of the valve stem 7 and the inner wall of the fixed sleeve 30, but also provide better protection and movement guiding for the outer wall of the valve stem 7.

[0042] As a technical optimization solution of the present invention, a plurality of third bolts 29 are installed on the top of the packing pressure plate 35, and the bottom ends of the third bolts 29 pass through the top of the packing pressure plate 35 and the fixing sleeve 30. The top end of the fixing sleeve 30 and the packing pressure plate 35 are both located inside the bracket 4; when in use, the third bolts 29 can drive the packing pressure plate 35 and the packing pressure sleeve 34 to squeeze the packing 33, so that the inner wall of the packing 33 is in closer contact with the outer wall of the valve stem 7, so that the sealing performance of the packing 33 is better.

[0043] When the present invention is in use, the staff connects both ends of the valve tube 2 to temporary pipelines, and the end of the valve tube 2 close to the second valve seat 15 is the air inlet, and the end close to the first valve seat 14 is the air outlet. When in use, the gas is transported in one direction. When in use, the staff installs the throttle ring 13 on the side of the valve plate 12 close to the air inlet, and connects and fixes the throttle ring 13 and the valve plate 12 through the first bolt 11 and the disc spring 26. When in use, the throttle ring 13 and the valve plate 12 are flexibly connected through the disc spring 26 and the first bolt 11, so that the thickness of the valve plate 12 has a certain elastic expansion, which can not only compensate for the error caused by the processing of the valve plate 12, but also absorb the linear expansion of the valve plate 12 when the valve pipe 2 is working in a hot state. It can effectively eliminate the risk of the valve plate 12 locking when in use. When the valve plate 12 on both sides expands slightly due to steam heating inside the valve pipe 2, it will slightly squeeze the disc spring 26 and the throttle ring 13. The elastic expansion of the disc spring 26 ensures that the overall thickness of the valve plate 12 and the throttle ring 13 will not change, preventing the valve plate 12 from locking during use, resulting in an inability to lift or move.

[0044] During use, the staff installs the valve stem 7 and the bottom end of the valve plate 12 inside the valve body 1 and the valve tube 2. When installing the valve plate 12, the fixing plates 24 located on both sides of the valve plate 12 move into the interior of the limiting groove 18 and move toward the bottom end of the inner wall of the valve tube 2 until the bottom end of the valve plate 12 abuts the inner bottom of the installation groove 20. The bottom end of the throttle ring 13 located on the side of the valve plate 12 is located inside the retaining groove 21. During use, the limiting groove 18 can effectively guide and position the movement of the valve plate 12, while improving the stability of the valve plate 12 during movement. During use, the two sides of the valve plate 12 are not symmetrical. The side of the valve plate 12 with the inclined surface abuts the first valve seat 14, while the other side is located near the air inlet. During use, the throttle ring 13 installed on the side can better block the conveyed gas for a short period of time when the valve plate 12 is raised and lowered.

[0045] After the staff has completed the installation of the valve stem 7 and the valve plate 12, the staff can install the valve cover 16 and the support plate 3 in turn. When in use, the valve cover 16 is fixed to the bottom of the support plate 3, so that the support plate 3 can better limit the position of the valve cover 16 by abutting against the top of the valve body 1. The staff installs the third bolt 29 and rotates the third bolt 29 to drive the packing pressure plate 35 to drive the packing sleeve 34 to squeeze the packing 33, so that the inner wall of the packing 33 is in better contact with the outer wall of the valve stem 7. When in use, the packing 33 can better seal the gap between the inner wall of the fixing sleeve 30 and the outer wall of the valve stem 7. When in use, the threaded sleeve 5 at the top of the bracket 4 is threadedly installed on the top outer wall of the valve stem 7, and the staff connects and fixes the bracket 4, the support plate 3 and the top of the valve body 1 through several second bolts 23. When the valve plate 12 or the throttle ring 13 is damaged during use and needs to be repaired or replaced, the staff can quickly remove the bracket 4, the support plate 3 and the valve cover 16 by removing the second bolts 23, and quickly take out the valve plate 12 and the throttle ring 13 through the valve stem 7 for repair or replacement.

[0046] When the staff needs to move the valve plate 12 upward to transfer the gas inside the valve tube 2 near the air inlet end toward the other end, the staff rotates the handwheel 6 to drive the valve stem 7 to rotate, and the valve stem 7 is driven upward by the mutual threaded connection between the valve stem 7 and the threaded sleeve 5. During use, the two sides of the valve plate 12 are slidably connected to the limiting groove 18 through the fixed plate 24, and the sliding hole 17 limits the top of the valve plate 12. Therefore, when the valve stem 7 rotates and moves upward, it only drives the valve plate 12 upward and does not drive the valve plate 12 to rotate. The valve plate 12 has good stability when moving upward.

[0047] When the valve plate 12 moves upward, the bottom end of the valve plate 12 gradually breaks contact with the bottom of the mounting groove 20, so that a crescent-shaped arc gap is formed between the bottom end of the valve plate 12 and the bottom of the mounting groove 20. The bottom end of the throttle ring 13 located on the side of the valve plate 12 is mostly located inside the clamping groove 21. Therefore, after the throttle ring 13 breaks contact with the bottom of the mounting groove 20 as the valve plate 12 moves upward, the throttle ring 13 does not move out of the clamping groove 21. When the valve plate 12 continues to move upward, the gap between the bottom end of the valve plate 12 and the bottom of the mounting groove 20 gradually increases to a specified area, and the bottom end of the throttle ring 13 completely moves out of the slot 21, and the steam inside the valve tube 2 near the air inlet flows to the other end of the valve tube 2 through the gap between the bottom end of the throttle ring 13 and the bottom of the mounting groove 20. At this time, because the gap between the bottom end of the valve plate 12 and the bottom of the mounting groove 20 is large enough, the welding slag, sand, rust and other debris carried by the steam flow will not cause serious friction damage to the bottom end of the valve plate 12 and the first valve seat 14. When in use, it can provide better protection for the valve plate 12 and the first valve seat 14, preventing the circulation of steam and debris from causing serious friction damage to the valve plate 12 and the first valve seat 14 when the gap between the bottom end of the valve plate 12 and the bottom of the mounting groove 20 is small.

[0048] When the inlet-side throttle ring 13 is opened, it has a hysteresis relative to the valve plate 12. When the steam starts to purge effectively, the outlet side of the valve plate 12 is fully opened, so that a sufficiently large flow area is formed between the outlet-side mounting groove 20 and the valve plate 12, and the purge steam can flow smoothly under the valve plate 12, protecting the outlet-side sealing pair from damage to the greatest extent. When the staff needs to close the steam flow inside the valve pipe 2 through the valve plate 12, the handwheel 6 and the valve stem 7 drive the valve plate 12 to move downward, and the bottom end of the throttle ring 13 on the side of the valve plate 12 first enters the interior of the card groove 21. After the throttle ring 13 and the mounting groove 20 cooperate with each other to cut off the flow of steam, the valve plate 12 then abuts against the inner bottom of the mounting groove 20 to completely close the interior of the valve pipe 2.

[0049] During use, a number of detection plates 10 with different functions are installed on the inner walls of both ends of the valve tube 2, including a temperature detection plate, an air pressure detection plate, and an air flow rate detection plate, and are interconnected with the display screen 19 through a connecting rod 27, so that the staff can understand the situation inside the valve tube 2 and the temporary pipeline in real time through the display screen 19, so that the staff can more accurately operate the valve plate 12 when it is raised and lowered, to prevent the air pressure from being too low to achieve a good purge effect, and to prevent the air pressure from being too high to cause damage to the temporary pipeline and the valve tube 2. During use, the staff can install and disassemble the display screen 19 at any time. When the staff needs to understand the interior of the temporary pipeline and the valve tube 2, the display screen 19 is placed in the placement slot 8 and pressed lightly, so that the display screen 19 and the connecting rod 27 are connected to each other, and the interior of the temporary pipeline can be understood through the display screen 19. When the staff does not need to understand the interior of the temporary pipeline, the display screen 19 can be directly pulled out.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An anti-purge impending valve capable of rapid online repair, comprising a valve body (1) and a valve pipe (2), characterized in that: The valve tube (2) is mounted on the bottom end of the valve body (1), and a sliding hole (17) is provided on the inner bottom of the valve body (1). The valve tube (2) and the valve body (1) are connected to each other through the sliding hole (17). An annular mounting groove (20) is provided on the inner wall of the valve tube (2) below the sliding hole (17). A first valve seat (14) and a second valve seat (15) are respectively installed at both ends of the inner portion of the mounting groove (20). An arc-shaped clamping groove (21) is provided on one side of the inner bottom of the mounting groove (20) close to the second valve seat (15); A valve plate (12) is slidably mounted between the first valve seat (14) and the second valve seat (15). An elliptical throttling ring (13) is sleeved on a side of the valve plate (12) close to the second valve seat (15). The bottom end of the throttling ring (13) is located inside the groove (21), and the side of the throttling ring (13) away from the valve plate (12) abuts against the second valve seat (15).

2. The anti-purge valve capable of online rapid repair according to claim 1, characterized in that: The top end of the valve plate (12) passes through the interior of the valve body (1) through the sliding hole (17) and is installed with a concave connecting block (22). Limiting grooves (18) are provided on the inner walls of both sides of the installation groove (20) below the sliding hole (17). Fixed plates (24) are installed on the outer walls of both sides of the valve plate (12). The fixed plates (24) are slidably installed inside the limiting grooves (18). The opposing surfaces of the first valve seat (14) and the valve plate (12) are provided with mutually matching inclined surfaces.

3. The anti-purge valve capable of online rapid repair according to claim 1, characterized in that: A plurality of detection plates (10) are installed on the inner walls of both ends of the valve tube (2) in the longitudinal direction, a placement groove (8) is provided on both sides of the top of the valve body (1), a limiting hole (9) is provided on the inner wall of the placement groove (8) in the longitudinal direction, a display screen (19) is installed inside the placement groove (8), and a plurality of connecting rods (27) are installed on the inner bottom of the placement groove (8), the connecting rods (27) and the detection plates (10) are electrically connected to each other, and a plurality of slots matching the connecting rods (27) are provided at the bottom of the display screen (19).

4. The anti-purge valve capable of online rapid repair according to claim 2, characterized in that: The side of the throttle ring (13) is provided with a plurality of screw holes, which penetrate the side of the throttle ring (13) and the valve plate (12). The internal threads of the screw holes are provided with first bolts (11). An annular groove (25) is provided on the inner wall of the screw hole on the throttle ring (13) near one end of the valve plate (12). A disc spring (26) is provided inside the groove (25). The disc spring (26) is movably provided on the outer wall of the first bolt (11).

5. The anti-purge valve capable of online rapid repair according to claim 2, characterized in that: A support plate (3) is mounted on the top of the valve body (1), a valve cover (16) is mounted on the bottom of the support plate (3), the valve cover (16) is located inside the valve body (1), a fixing sleeve (30) is mounted on the top of the support plate (3), a bracket (4) is mounted on the top of the support plate (3), and the bottom end of the bracket (4) is slidably mounted on the outer wall of the fixing sleeve (30).

6. The anti-purge valve capable of online rapid repair according to claim 5, characterized in that: A through hole is provided at the bottom of the valve cover (16), which passes through the valve cover (16) and the support plate (3) and is communicated with the interior of the fixing sleeve (30). A fixing groove (28) matching the connecting block (22) is provided on the inner wall of the bottom end of the through hole. A valve stem (7) is movably installed in the through hole, and the bottom end of the valve stem (7) is rotatably connected to the connecting block (22).

7. The anti-purge valve capable of online rapid repair according to claim 6, characterized in that: A plurality of second bolts (23) are installed at the inner bottom of the bracket (4), the bottom ends of the second bolts (23) pass through the bracket (4), the support plate (3) and the top of the valve body (1), a threaded sleeve (5) is installed at the top end of the bracket (4), the threaded sleeve (5) is threadedly installed on the top outer wall of the valve stem (7), and a hand wheel (6) is installed at the top end of the valve stem (7).

8. The anti-purge valve capable of online rapid repair according to claim 6, characterized in that: An annular groove (31) is formed on the inner wall of the fixing sleeve (30), the top of the annular groove (31) passes through the fixing sleeve (30), a stuffing pad (32) is installed on the inner bottom of the annular groove (31), a stuffing (33) is installed on the top of the stuffing pad (32), a stuffing pressing sleeve (34) is installed on the top of the stuffing (33), and the top of the stuffing pressing sleeve (34) passes through the annular groove (31).

9. The anti-purge impending valve capable of online rapid repair according to claim 8, characterized in that: A packing pressure plate (35) is installed on the top of the annular groove (31). The packing pad (32), the packing (33), the packing pressure sleeve (34) and the packing pressure plate (35) are all annular and are movably installed on the outer wall of the valve stem (7).

10. The anti-purge valve capable of online rapid repair according to claim 9, characterized in that: A plurality of third bolts (29) are installed on the top of the packing pressure plate (35), and the bottom ends of the third bolts (29) pass through the top of the packing pressure plate (35) and the fixing sleeve (30). The top end of the fixing sleeve (30) and the packing pressure plate (35) are both located inside the bracket (4).

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