Pressure type instant shut-off valve structure

Abstract

The utility model provides a pressure type instant shut-off valve structure, relates to shut-off valve field, include: valve body, evacuation subassembly, shut-off subassembly and emergency shut-off device, evacuation subassembly is installed in the inner cavity of valve body, and evacuation subassembly includes impeller shaft and connect the impeller blade on the outside of impeller shaft, and the emergency shut-off device is connected to the shut-off subassembly. The closing assembly is arranged on the front side of the emptying assembly and comprises a first valve plate and a second valve plate which are movably connected in an inner cavity of the valve body in an inserted mode, and the emergency closing device is arranged on the front side of the closing assembly and comprises a valve element plate rotationally connected in a valve body pipeline. The pressure type instant shut-off valve solves the problems that an existing pressure type instant shut-off valve is prone to misjudgment on the leakage condition, and it cannot be guaranteed that the valve is shut off in time during leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of shutoff valves, in particular to a pressure-type instantaneous shutoff valve structure. Background Art

[0002] The fast shut-off valve is an important part of the safety system of the thermal power plant unit. It is an important safety device to ensure the safe operation of the extraction steam unit and prevent the steam backflow in the extraction steam pipeline from causing the turbine overspeed accident. The current shut-off valve has the defects of slow closing response, loose closing, poor reliability, and inability to effectively prevent the backflow of extraction steam. It has caused several major accidents caused by the backflow of extraction steam and caused serious overspeed, and there are major hidden dangers to production safety. After searching, the prior art (application number: CN201821454966.2) records "a pressure-type instantaneous shut-off valve, including a valve body and a first valve, wherein the valve body is provided with the first valve, a block is provided on one side of the first valve, a second valve is provided on one side of the block, a sealer is provided on the upper side of the block, a leakage detector is provided on the lower side of the sealer, a pressure sensor is provided on the lower side of the sealer, a buffer column is provided on the upper side of the sealer, a mechanical push rod is provided on the upper side of the buffer column, a hydraulic actuator is provided on the upper side of the mechanical push rod, a controller is provided on the upper side of the hydraulic actuator, an alarm is provided on one side of the controller, an inlet pipe is provided on one side of the valve body, and an outlet pipe is provided on one side of the valve body."

[0003] However, although the pressure-type instantaneous shut-off valve in the prior art has achieved the effects of rapid shut-off, long service life and timely alarm, it still has some shortcomings: when the two valves involved in the existing pressure-type instantaneous shut-off valve are actuated at the same time, there is a time difference in the flow of media on both sides of them, so it is impossible to ensure that the space between the valves is in a medium-free state when the valves fall at the same time. Therefore, there may be a small amount of medium between the valves, which may affect the misjudgment of the leakage detector. Secondly, manual shutdown is still required after the leakage alarm occurs. When manual failure is discovered in time, there will be safety hazards. Utility Model Content

[0004] In order to overcome the defects of the prior art, a pressure-type instantaneous shut-off valve structure is now provided to solve the problem that the existing pressure-type instantaneous shut-off valve is prone to misjudgment of leakage and cannot ensure timely shut-off of the valve when leakage occurs.

[0005] To achieve the above-mentioned purpose, a pressure-type instantaneous shut-off valve structure is provided, comprising: a valve body, an emptying assembly, a shut-off assembly and an emergency closing device, wherein the emptying assembly is installed in the inner cavity of the valve body, and the emptying assembly comprises an impeller shaft and impeller blades connected to the outside of the impeller shaft, the shut-off assembly is arranged at the front side of the emptying assembly, and the shut-off assembly comprises a first valve plate and a second valve plate movably inserted in the inner cavity of the valve body, the emergency closing device is arranged at the front side of the shut-off assembly, and the emergency closing device comprises a valve core plate rotatably connected in the valve body pipeline.

[0006] Preferably, the emptying assembly includes a fixing rod fixed in the inner cavity of the valve body, and a shaft sleeve is connected to the center of the fixing rod, and both ends of the impeller shaft are rotatably connected to the shaft sleeve.

[0007] Preferably, the length of the first valve plate is greater than that of the second valve plate, a first positioning groove is provided on the lower side of the first valve plate and on the inner wall of the valve body, and a second positioning groove is provided on the lower side of the second valve plate and on the inner wall of the valve body.

[0008] Preferably, a stopper and a leakage detector are provided between the first valve plate and the second valve plate, and the leakage detector is located on the upper side of the stopper.

[0009] Preferably, the upper ends of the first valve plate and the second valve plate are both connected to connecting rods, and the upper ends of the connecting rods are connected to mechanical push rods, and the upper ends of the mechanical push rods are connected to hydraulic actuators, and the lower ends of the mechanical push rods are connected to buffer components.

[0010] Preferably, the shutoff assembly further comprises a sealing box, and a controller is provided on the upper side of the sealing box, and the hydraulic actuator is fixed to the top of the inner side of the sealing box, and the mechanical push rod is slidably connected in the sealing box.

[0011] Preferably, the upper end of the valve core plate is connected to a driving shaft, and the upper end of the driving shaft is connected to a gear box, a group of meshing gear sets are provided inside the gear box, and a motor is installed on the upper side of the gear box.

[0012] Preferably, the gear box is fixed to the outer wall of the valve body, and the gear set includes two gears mounted on the drive shaft and the motor output shaft, and the drive shaft rotates through the outer wall of the valve body.

[0013] The beneficial effects of the utility model are:

[0014] 1. The controller and hydraulic actuator, as well as the mechanical push rod and connecting rod, are used to simultaneously start the first valve plate and the second valve plate to realize the closing action. During this process, the first valve plate first contacts the first positioning groove to realize the closing action. At this time, the second valve plate is still in a semi-open state. At the same time, the impeller blades included in the emptying assembly realize self-rotation under the inertia drive of the initial air flow and liquid flow. When the first valve plate is closed, it still maintains the rotating state, and then the gas medium or liquid medium between the two valve plates is continuously drawn to the output end of the valve body at the moment when the second valve plate is not completely closed, so that the space between the valve plates is emptied. Then, when a leak occurs, the leak detector can make an accurate judgment on the leak situation;

[0015] 2. When leakage occurs, the leak detector is electrically connected to the motor through the controller, so that the motor is started, and the drive shaft is driven to rotate through the gear set in the gear box, and then the valve core plate is mobilized to rotate to achieve automatic closing, and then the valve body is automatically closed at the front end of the two valve plates, ensuring the timely closing of the valve and avoiding safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall cross-sectional structure of an embodiment of the utility model.

[0017] Figure 2 For the utility model embodiment Figure 1 Schematic diagram of the structure at point A in the middle.

[0018] Figure 3 It is a schematic diagram of the side structure of the emptying assembly of an embodiment of the utility model.

[0019] Figure 4 This is a schematic structural diagram of an emergency closing device according to an embodiment of the utility model.

[0020] In the figure: 1. valve body; 2. emptying assembly; 21. fixing rod; 22. impeller shaft; 23. impeller blade; 3. shut-off assembly; 31. sealing box; 32. controller; 33. hydraulic actuator; 34. mechanical push rod; 35. buffer; 36. connecting rod; 37. first valve plate; 371. first positioning groove; 38. second valve plate; 381. second positioning groove; 39. stopper; 310. leakage detector; 4. emergency closing device; 41. motor; 42. gear box; 43. gear set; 44. drive shaft; 45. valve core plate. DETAILED DESCRIPTION

[0021] Reference Figures 1 to 4As shown, the utility model provides a pressure-type instantaneous shut-off valve structure, including: a valve body 1, an emptying component 2, a shut-off component 3 and an emergency closing device 4, the emptying component 2 is installed in the inner cavity of the valve body 1, and the emptying component 2 includes an impeller shaft 22 and an impeller blade 23 connected to the outside of the impeller shaft 22, the emptying component 2 also includes a fixing rod 21 fixed in the inner cavity of the valve body 1, and a shaft sleeve is connected at the center of the fixing rod 21, and both ends of the impeller shaft 22 are rotatably connected to the shaft sleeve, the shut-off component 3 is arranged at the front side of the emptying component 2, and the shut-off component 3 includes a first valve plate 37 and a second valve plate 38 movably plugged into the inner cavity of the valve body 1, the emergency closing device 4 is arranged at the front side of the shut-off component 3, and the emergency closing device 4 includes a valve core plate 45 rotatably connected in the pipeline of the valve body 1.

[0022] In this embodiment, the valve body 1, the emptying assembly 2, the shut-off assembly 3 and the emergency closing device 4 constitute the main structure of a pressure-type instantaneous shut-off valve structure involved in this application, and the valve body 1 involved in this application is used for the instantaneous shut-off operation of gas and liquid during the transportation process, and the left side of the valve body 1 is the inlet end and the right side is the output end.

[0023] Specifically, the fixing rod 21 is configured as a cross structure and is rotatably connected to the front and rear ends of the impeller shaft 22 to achieve stable fixation of the impeller shaft 22. At the same time, the impeller blades 23 achieve self-rotation under the impact of airflow or liquid flow.

[0024] Through the above technical solution, when the first valve plate 37 is closed, the gas or liquid continues to be pumped out to the output end through its own rotation. Compared with the two valve plates being closed at the same time in the comparative document, the concentration of the medium remaining between the valve plates is reduced, thereby ensuring the accuracy of detection when leakage occurs.

[0025] like Figure 1 and Figure 2 As shown, the length of the first valve plate 37 is greater than that of the second valve plate 38, a first positioning groove 371 is provided on the lower side of the first valve plate 37 and on the inner cavity wall of the valve body 1, and a second positioning groove 381 is provided on the lower side of the second valve plate 38 and on the inner cavity wall of the valve body 1, a stopper 39 and a leakage detector 310 are provided between the first valve plate 37 and the second valve plate 38, and the leakage detector 310 is located on the upper side of the stopper 39, the upper ends of the first valve plate 37 and the second valve plate 38 are both connected to a connecting rod 36, and the upper ends of the connecting rod 36 are connected to a mechanical push rod 34, and the upper ends of the mechanical push rod 34 are connected to a hydraulic actuator 33, and a buffer 35 is connected to the lower end of the mechanical push rod 34, the shut-off assembly 3 also includes a sealing box 31, and a controller 32 is provided on the upper side of the sealing box 31, and the hydraulic actuator 33 is fixed to the inner top of the sealing box 31, and the mechanical push rod 34 is slidably connected in the sealing box 31.

[0026] Specifically, the vertical depth of the first positioning groove 371 is greater than that of the second positioning groove 381 , so that the movement stroke of the first valve plate 37 is extended, and when the second valve plate 38 is fully closed, there is time to extract the residual medium in the inner space of the two valve plates.

[0027] Specifically, the controller 32 includes a wireless communication module, so as to facilitate remote control shutdown, and a pressure sensor is also installed on the valve body 1 to facilitate timely detection of the internal delivery pressure.

[0028] Specifically, the buffer member 35 includes two upper and lower positioning sleeves and a spring connected between the sleeves, wherein the upper sleeve is fixed to the lower side of the mechanical push rod 34, and the lower sleeve is fixed to the outer wall of the valve body 1. The buffer member 35 is provided to achieve buffer protection for the instantaneous action of the valve plate.

[0029] like Figure 1 and Figure 4 As shown, the upper end of the valve core plate 45 is connected to a drive shaft 44, and the upper end of the drive shaft 44 is connected to a gear box 42. A group of meshing gear sets 43 are provided inside the gear box 42. At the same time, a motor 41 is installed on the upper side of the gear box 42. The gear box 42 is fixed to the outer wall of the valve body 1, and the gear set 43 includes two gears installed on the drive shaft 44 and the output shaft of the motor 41, and the drive shaft 44 rotates through the outer wall of the valve body 1.

[0030] Specifically, the valve core plate 45 is configured as a valve plate structure inside the butterfly valve, that is, the whole is a circular plate, a vertical connecting shaft is welded in the middle of the circular plate, and the lower end of the connecting shaft is rotatably connected to the inner wall of the valve body 1.

[0031] Through the above technical solution, when leakage occurs, the valve body 1 is automatically closed in time from the front end of the valve plate through the drive shaft 44 and the valve core plate 45.

[0032] When in use, a controller and a hydraulic actuator, as well as a mechanical push rod and a connecting rod, are used to facilitate the simultaneous start of the first valve plate and the second valve plate to realize a closing action. During this process, the first valve plate first contacts the first positioning groove to realize a closing action. At this time, the second valve plate is still in a semi-open state. At the same time, the impeller blades included in the emptying assembly realize self-rotation under the inertia drive of the initial airflow and liquid flow. When the first valve plate is closed, it still maintains a rotating state, and then utilizes the moment when the second valve plate is not completely closed to continue to extract the gas medium or liquid medium between the two valve plates to the output end of the valve body, so that the space between the valve plates is emptied. Then, when a leak occurs, the leak detector can be used to make an accurate judgment on the leak situation. When a leak occurs, the leak detector is used to be electrically connected to the motor through the controller, so that the motor is started, and the drive shaft is driven to rotate through the gear set in the gear box, and then the valve core plate is mobilized to rotate to realize automatic closing.

[0033] The pressure-type instantaneous shut-off valve structure of the utility model can effectively solve the problem that the existing pressure-type instantaneous shut-off valve is prone to misjudgment of leakage and cannot ensure timely shut-off of the valve when leakage occurs. It improves the accuracy of the shut-off valve in judging the leakage situation and ensures the timeliness of shutting off the valve when leakage occurs on the basis of the existing pressure-type instantaneous shut-off valve structure technology.

Claims

1. A pressure-type instantaneous shut-off valve structure, comprising: A valve body (1), an emptying assembly (2), a shut-off assembly (3) and an emergency shut-off device (4), characterized in that: the emptying assembly (2) is installed in the inner cavity of the valve body (1), and the emptying assembly (2) comprises an impeller shaft (22) and an impeller blade (23) connected to the outer side of the impeller shaft (22); the shut-off assembly (3) is arranged at the front side of the emptying assembly (2), and the shut-off assembly (3) comprises a first valve plate (37) and a second valve plate (38) movably plugged into the inner cavity of the valve body (1); the emergency shut-off device (4) is arranged at the front side of the shut-off assembly (3), and the emergency shut-off device (4) comprises a valve core plate (45) rotatably connected to the pipe of the valve body (1).

2. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: The drain assembly (2) comprises a fixing rod (21) fixed in the inner cavity of the valve body (1), a shaft sleeve is connected at the center of the fixing rod (21), and both ends of the impeller shaft (22) are rotatably connected in the shaft sleeve.

3. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: The length of the first valve plate (37) is greater than that of the second valve plate (38); a first positioning groove (371) is provided on the lower side of the first valve plate (37) and on the inner wall of the valve body (1); and a second positioning groove (381) is provided on the lower side of the second valve plate (38) and on the inner wall of the valve body (1).

4. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: A stopper (39) and a leakage detector (310) are provided between the first valve plate (37) and the second valve plate (38), and the leakage detector (310) is located on the upper side of the stopper (39).

5. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: The upper ends of the first valve plate (37) and the second valve plate (38) are both connected to a connecting rod (36), the upper end of the connecting rod (36) is connected to a mechanical push rod (34), the upper end of the mechanical push rod (34) is connected to a hydraulic actuator (33), and the lower end of the mechanical push rod (34) is connected to a buffer (35).

6. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: The shutoff assembly (3) further comprises a sealing box (31), wherein a controller (32) is provided on the upper side of the sealing box (31), and a hydraulic actuator (33) is fixed to the top of the inner side of the sealing box (31), and a mechanical push rod (34) is slidably connected in the sealing box (31).

7. A pressure-type instantaneous shut-off valve structure according to claim 1, characterized in that: The upper end of the valve core plate (45) is connected to a drive shaft (44), and the upper end of the drive shaft (44) is connected to a gear box (42). A group of meshing gear sets (43) are provided inside the gear box (42), and a motor (41) is installed on the upper side of the gear box (42).

8. A pressure-type instantaneous shut-off valve structure according to claim 7, characterized in that: The gear box (42) is fixed to the outer wall of the valve body (1), and the gear set (43) includes two gears mounted on the drive shaft (44) and the output shaft of the motor (41), and the drive shaft (44) rotates through the outer wall of the valve body (1).

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