Safety valve capable of preventing leakage

Abstract

The utility model discloses a safety valve capable of preventing leakage, which relates to the technical field of safety valve equipment, and comprises a valve sealing cover, a valve elastic execution component, a fan blade rotating shaft and a discharge-in pipe joint, a fan blade rotating shaft support frame is arranged in the discharge-in pipe joint, and the fan blade rotating shaft is axially inserted on the fan blade rotating shaft support frame to rotate. A fan blade device is arranged at the lower end of the fan blade rotating shaft, the upper portion of the fan blade rotating shaft is sequentially sleeved with an upper end sleeve, a pressure bearing, a supporting lifting sleeve and a fixed sleeve from top to bottom, and a lifting spring with the bottom end extruded on the fixed sleeve is arranged in the supporting lifting sleeve; a scraper plate supporting frame is movably arranged on the supporting lifting sleeve in a surrounding mode, a fixed included angle is formed between the scraper plate supporting frame and the supporting lifting sleeve, and a scraper plate block is arranged on the top of the scraper plate supporting frame. A fixing support corresponding to the scraper supporting frame is arranged on the fixing sleeve in a surrounding mode, an arc-shaped limiting groove is formed in the middle of the scraper supporting frame, and a limiting column inserted into the arc-shaped limiting groove is arranged at the top of the fixing support.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valve equipment, in particular to a safety valve that prevents leakage. Background Art

[0002] A safety valve is a specially designed valve that automatically opens when the pressure of the medium in a device or pipeline exceeds a specified value, discharging the medium to prevent the pressure from exceeding a safe range. A safety valve is an automatic valve and holds a special place in the valve family. Unlike other valves that merely function as an on / off switch, it more importantly protects the equipment.

[0003] The operating principle of a safety valve is based on the set pressure of its internal spring. When the pressure within the equipment or pipeline exceeds the set pressure of the safety valve, the spring can no longer maintain its seal, allowing excess media to escape, maintaining the system pressure at a safe level. This automatic opening and closing feature allows the safety valve to quickly respond to pressure changes in the system without human intervention, effectively preventing equipment damage or accidents caused by excessive pressure.

[0004] Safety valves require regular maintenance during long-term use, such as testing the effectiveness of the spring of the valve elastic actuator, checking whether the safety valve is leaking, and cleaning the sealing surface of the safety valve. During the maintenance process, impurities often remain between the valve sealing cover and the sealing pipe mouth of the discharge pipe joint after opening. When the safety valve is closed again, the valve sealing cover and the sealing pipe mouth cannot be sealed, which will cause the valve to leak over time.

[0005] In addition, the disadvantage of the safety valve is that the applied load will change as the valve opens, that is, as the valve sealing cover rises, the compression of the pressure spring increases, and the force acting on the valve sealing cover also increases. If the medium pressure cannot continue to rise, the valve sealing cover cannot be fully opened to relieve pressure. Utility Model Content

[0006] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a safety valve that prevents leakage, so as to solve the problem that impurities often remain between the valve sealing cover and the sealing pipe opening after the valve is opened, and when the safety valve is closed again, the valve sealing cover and the sealing pipe opening of the discharge pipe joint cannot be sealed and fitted, resulting in valve leakage.

[0007] The utility model is achieved through the following technical solutions:

[0008] A safety valve for preventing leakage comprises a valve sealing cover, a valve elastic actuator, a fan blade shaft and an inlet pipe joint, wherein a fan blade shaft support frame is provided in the inlet pipe joint, the fan blade shaft is axially inserted on the fan blade shaft support frame for rotation, a fan blade device is provided at the lower end of the fan blade shaft, an upper sleeve, a pressure bearing, a support lifting sleeve and a fixed sleeve are sequentially sleeved on the upper part of the fan blade shaft from top to bottom, a lifting spring with its bottom end pressed on the fixed sleeve is provided in the support lifting sleeve; a scraper support frame is provided on the support lifting sleeve for movement around the support lifting sleeve, the scraper support frame is arranged at a fixed angle to the support lifting sleeve, and a scraper plate is provided on the top of the scraper support frame.

[0009] A fixing bracket is arranged on the fixing sleeve corresponding to the scraper supporting bracket, an arc-shaped limiting groove is arranged in the middle of the scraper supporting bracket, and a limiting column inserted in the arc-shaped limiting groove is arranged on the top of the fixing bracket.

[0010] The valve sealing cover is squeezed and sealed on the sealing pipe mouth of the discharge pipe joint by the valve elastic actuator. When the pressure is released, the fluid medium squeezes the valve sealing cover to open and release the pressure. The upper sleeve, pressure bearing and supporting lifting sleeve are elastically squeezed by the lifting spring and rise with the valve sealing cover. The scraper support frame is also limited and raised along with the supporting lifting sleeve. The scraper plate on the top of the scraper support frame moves to between the sealing surface of the valve sealing cover and the discharge pipe joint. The fluid medium drives the fan blade device and the fan blade rotating shaft 3 to rotate, and the fan blade rotating shaft indirectly drives the scraper plate to rotate to scrape off impurities on the sealing surface of the valve sealing cover and the discharge pipe joint.

[0011] Furthermore, two symmetrical block mounting grooves are provided at the top of the fan blade shaft, and blocks are installed in the block mounting grooves through hinge shafts. When the valve sealing cover is squeezed and sealed on the sealing pipe mouth of the discharge pipe joint, the block is in a horizontal state, the valve sealing cover is squeezed on the upper side of the block, and the lower side of the block is squeezed on the upper end face of the upper sleeve; when the valve sealing cover is opened, the fluid medium squeezes the valve sealing cover to lift, and the upper end sleeve, pressure bearing and supporting lifting sleeve are lifted along with the valve sealing cover under the squeeze of the lifting spring, and the block rotates around the hinge shaft under the push of the upper end sleeve, so that the block is in a vertical state, and the upper end face of the upper end sleeve is under low pressure on the valve sealing cover.

[0012] Furthermore, the scraper plate is hinged to the top of the scraper support frame through a rotating shaft, and a coil spring is provided on the rotating shaft.

[0013] Furthermore, the scraper plate is made of plastic, and scraper blades are respectively provided on the upper side and the lower side of the scraper plate.

[0014] Furthermore, a scraper support frame mounting ear is provided around the support lifting sleeve, and a long connecting groove is provided on the scraper support frame mounting ear. The scraper support frame is slidably connected in the long connecting groove through a square connecting shaft, and the scraper support frame slides in the long connecting groove through the square connecting shaft.

[0015] Furthermore, the fan blade shaft support frame includes a connecting frame and a shaft sleeve. Three connecting frames are evenly distributed around the shaft sleeve. The outer end of the connecting frame is connected to the pipe wall of the discharge pipe joint, and the fan blade shaft is inserted into the shaft sleeve through a bearing.

[0016] Furthermore, the bottom surface of the connecting frame is chamfered.

[0017] Furthermore, two scraper support frames are movably provided on the supporting lifting sleeve.

[0018] Furthermore, the fixed sleeve is fixedly mounted on the fan blade shaft, and a fixed bracket ear is arranged around the fixed sleeve, and a connecting hole is provided on the fixed bracket ear. A U-shaped plug-in bracket is provided at the bottom end of the fixed bracket, and a connecting hole is also provided on the U-shaped plug-in bracket. The fixed bracket and the fixed bracket ear are plugged into the corresponding connecting holes by bolts, and the fixed bracket and the fixed bracket ear are fixedly connected by tightening the bolts.

[0019] Furthermore, the top end surface of the fan blade shaft and the sealing pipe opening surface of the discharge pipe joint are in the same plane.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The utility model is a safety valve for preventing leakage. When the safety valve is opened, the power provided by the flow of the fluid medium in the safety valve drives the fan blade device to rotate, and the fan blade device drives the fan blade shaft to rotate, and the fan blade shaft drives the scraper plate to rotate to scrape off impurities on the sealing surface of the valve sealing cover and the discharge pipe joint. The innovation of the utility model is that: the scraper support frame for mounting the scraper plate does not change its length, and the scraper plate initially arranged in the valve discharge pipe joint is accurately delivered to the valve sealing cover and the discharge pipe joint sealing surface; and after the safety valve is closed, the scraper plate needs to be retracted into the valve discharge pipe joint in advance so as not to affect the valve closure.

[0022] 2. The utility model is a safety valve that prevents leakage. When the pressure is released, the safety valve has a valve sealing cover that cannot be fully opened to release the pressure, which may lead to a safety accident. When the valve sealing cover is opened, the utility model provides a lifting spring on the fan shaft. The lifting spring supports the lifting sleeve, the pressure bearing and the upper sleeve to assist in opening the valve sealing cover, so that the valve sealing cover is opened as much as possible to release the pressure, thereby ensuring timely pressure relief safety.

[0023] 3. The utility model provides a safety valve to prevent leakage, and two symmetrical blocks are provided at the top of the fan blade shaft. When the valve sealing cover and the valve discharge pipe joint are closed, the valve sealing cover is squeezed onto the upper sleeve by the laterally arranged blocks, so that the main elastic force of the lifting spring is blocked by the laterally arranged blocks. The valve sealing cover only needs a slight force on the blocks to lock the elastic force of the lifting spring, thereby greatly reducing the influence of the lifting spring on the safety valve when the safety valve is in the closed state, and can play an auxiliary opening role when the safety valve is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the external structure of an existing safety valve.

[0026] Figure 2 Schematic diagram of the internal structure of an existing safety valve.

[0027] Figure 3 This is a schematic diagram of the closed structure of a safety valve for preventing leakage in the utility model.

[0028] Figure 4 This is a schematic diagram of the opening structure of a safety valve for preventing leakage in the utility model.

[0029] Figure 5 For this utility model Figure 4 Schematic diagram of the structure of the middle part of the valve in the open state.

[0030] Figure 6 This is a schematic cross-sectional view of the utility model showing the scraper plate extending to open the pressure relief port.

[0031] Figure 7 This is a structural diagram of the utility model in which the scraper plate is extended to open the pressure relief port.

[0032] Figure 8 This is a structural schematic diagram of the utility model with the valve in the closed state and the scraper plate in the retracted state.

[0033] Figure 9 This is a schematic diagram of the structure of some components of the valve in the closed state of the utility model.

[0034] Figure 10 This is a partial structural diagram of the valve in the open state of the utility model.

[0035] Figure 11 This is a structural diagram of the scraping plate of the utility model.

[0036] Figure 12This is a schematic diagram of the fan blade shaft structure of the utility model.

[0037] Figure 13 This is a structural diagram of the scraper support frame of the utility model.

[0038] Figure 14 This is a structural diagram of the installation of the fan blade shaft support frame of the utility model.

[0039] Figure 15 This is a structural diagram of the fixing bracket of the utility model.

[0040] Markings and corresponding parts names in the accompanying drawings:

[0041] 1-valve sealing cover, 2-valve elastic actuator, 3-fan blade shaft, 4-discharge pipe joint, 5-fan blade shaft support frame, 6-fan blade device, 7-upper sleeve, 8-pressure bearing, 9-support lifting sleeve, 10-fixed sleeve, 11-lifting spring, 12-scraper support frame, 13-scraper plate, 14-fixed bracket, 15-arc limit groove, 16-limit column, 17-sealing pipe mouth, 18-stopper mounting groove, 19-stopper, 20-rotating shaft, 21-scraper plate, 22-scraper support frame mounting ear platform, 23-long connecting groove, 24-square connecting shaft, 25-connecting frame, 26-rotating shaft sleeve, 27-fixed bracket ear platform, 28-U-shaped bracket, 29-valve housing, 30-middle plug cover, 31-sliding rod, 32-pressure spring, 33-discharge outlet. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0043] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0044] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] In the description of this utility model, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two components or an interaction relationship between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0046] Example 1

[0047] like Figure 1-12 As shown, the utility model is a safety valve to prevent leakage, such as Figure 1-2 As shown, the traditional safety valve mainly includes a valve housing 29, a middle plugging cover 30, a valve sealing cover 1, a sliding rod 31, a pressure spring 32 and a valve discharge pipe joint 4. The valve elastic actuator 2 includes a middle plugging cover 30, a sliding rod 31 and a pressure spring 32. The middle plugging cover 30 is arranged in the middle cavity of the valve housing 29, and the sliding rod 31 above the middle plugging cover 3 is sleeved with a pressure spring 32. The lower end of the sliding rod 31 is provided with a valve sealing cover 1, and the valve discharge pipe joint 4 is installed on the access port of the valve housing 29. The extrusion elastic force of the valve sealing cover 1 sealing on the valve discharge pipe joint 4 is adjusted by adjusting the tightness of the pressure spring 31. When the pressure in the system reaches the threshold set by the safety valve, the fluid medium enters the safety valve through the valve discharge pipe joint 4, squeezing the valve sealing cover 1 to lift, and the fluid medium leaks from the opening between the valve sealing cover 1 and the valve discharge pipe joint 4, and then discharged from the discharge port 33 opened on the valve housing 29 of the safety valve.

[0048] like Figure 3-12 As shown in FIG, the utility model is a safety valve to prevent leakage, which mainly makes creative improvements in the sealing performance and pressure relief opening size of the safety valve. Figure 5-6As shown, specifically: a fan shaft support frame 5 is provided in the discharge pipe joint 4. In this embodiment, the three connecting frames 25 of the fan shaft support frame 5 are correspondingly installed in the three mounting grooves in the discharge pipe joint 4, and are fixedly connected by screws or welding. The fan shaft 3 is axially inserted on the fan shaft support frame 5 and rotates. The upper end surface of the fan shaft 3 is flush with the sealing pipe opening 17 of the discharge pipe joint 4. It can rotate freely without limiting the fan shaft 3. A fan blade device 6 is provided at the lower end of the fan shaft 3. The fan blade device 6 is generally provided with 2-3 fan blades. The shape of the fan blade is designed to be as slender as possible. In order to minimize the flow resistance of the fan blade fluid, the upper sleeve 7, the pressure bearing 8, the support lifting sleeve 9 and the fixed sleeve 10 are sequentially sleeved on the upper part of the fan blade shaft 3 from top to bottom; the upper sleeve 7 is a sleeve structure, and the pressure bearing 8 is used to isolate the upper sleeve 7 from the support lifting sleeve 9, because the upper sleeve 7 cannot rotate with the fan blade shaft 3, and the support lifting sleeve 9 needs to rotate to drive the scraper support frame 12, so the pressure bearing 8 is set for isolation, and a limit key and a limit groove can be provided between the support lifting sleeve 9 and the fan blade shaft 3, so that the support lifting sleeve 9 and the fan blade shaft 3 rotate synchronously.

[0049] like Figure 10 As shown, the supporting lifting sleeve 9 is provided with a lifting spring 11 whose bottom end is squeezed on the fixed sleeve 10. The supporting lifting sleeve 9 is provided with a ring groove for installing the lifting spring 11 from the bottom. The lifting spring 11 is stored in the ring groove after being compressed; the fixed sleeve 10 is fixed on the fan blade shaft 3 and does not rotate relative to it. A scraper support frame 12 is provided on the supporting lifting sleeve 9 so as to be movable around it. The scraper support frame 12 is set at a fixed angle to the supporting lifting sleeve 9, and a scraper plate 13 is provided on the top of the scraper support frame 12. The scraper support frame 12 is limited and can only move radially inward and outward along the support lifting sleeve 9. One of the core problems solved by the present invention is to control the scraper plate 13 on the scraper support frame 12 by the rotational power of the fan blade device 6 to move toward the sealing surface on the opened valve sealing cover 1. Because the length of the scraper support frame 12 is certain, in the initial position of the scraper support frame 12, the scraper plate 13 cannot scrape the sealing surface on the valve sealing cover 1, so the scraper support frame 12 must move radially outward of the support lifting sleeve 9 when it is lifted with the support lifting sleeve 9.

[0050] like Figure 15As shown, a fixed bracket 14 is provided on the fixed sleeve 10 in correspondence with the scraper support frame 12, an arc-shaped limiting groove 15 is provided in the middle of the scraper support frame 12, and a limiting column 16 is provided on the top of the fixed bracket 14 and inserted into the arc-shaped limiting groove 15. The above description states that the scraper support frame 12 must move radially outward from the support lifting sleeve 9. The present invention provides a fixed fixed bracket 14, and the angle between the fixed bracket 14, the support lifting sleeve 9, and the fixed sleeve 10 is fixed. Therefore, the space of the limiting column 16 on the top of the fixed bracket 14 is also relatively fixed. By providing the arc-shaped limiting groove 15 in the middle of the scraper support frame 12, the scraper support frame 12 also moves radially outward from the support lifting sleeve 9 during the lifting process of the scraper support frame 12, so that the scraper plate 13 can accurately scrape the sealing surface on the valve sealing cover 1.

[0051] Since the scraper plate 13 has a certain rotation space relative to the scraper support frame 12, the scraper plate 13 can adjust its own position when it contacts the valve sealing cover 1. Since the scraper plate 13 is made of plastic and has a certain elasticity, it can be slightly deformed. In addition, scraper plates 21 are provided on the upper and lower sides of the scraper plate 13. While scraping the sealing surface on the valve sealing cover 1, it can also scrape the sealing pipe mouth 17 of the discharge pipe joint 4. When the scraper plate 13 rotates, it can scrape off impurities (including oil blocks, other air-dried sticky materials) on the sealing surfaces of the valve sealing cover 1 and the discharge pipe joint 4. When the valve sealing cover 1 and the discharge pipe joint 4 are docked and sealed again, complete sealing can be achieved, and there is no need to clean the safety valve regularly.

[0052] The valve sealing cover 1 is squeezed and sealed on the sealing pipe mouth 17 of the discharge pipe joint 4 by the valve elastic actuator 2. When the pressure is released, the fluid medium squeezes the valve sealing cover 1 to open the pressure relief, and the upper sleeve 7, the pressure bearing 8 and the supporting lifting sleeve 9 are elastically squeezed by the lifting spring 11 and rise with the valve sealing cover 1. The scraper support frame 12 is also limited and raised along with the supporting lifting sleeve 9. The scraper plate 13 on the top of the scraper support frame 12 moves to between the sealing surface of the valve sealing cover 1 and the discharge pipe joint 4. The fluid medium drives the fan blade device 6 and the fan blade rotating shaft 3 to rotate, and the fan blade rotating shaft 3 indirectly drives the scraper plate 13 to rotate to scrape off impurities on the sealing surface of the valve sealing cover 1 and the discharge pipe joint 4.

[0053] The scraper plate 13 is hinged to the top of the scraper support frame 12 via a rotating shaft 20, which is equipped with a coil spring. This allows the scraper plate 13 to rotate relative to the scraper support frame 12. The scraper plate 13 is made of plastic and has scraper blades 21 on its upper and lower sides. These scrapers scrape the sealing surface of the valve sealing cover 1 while also scraping the sealed pipe opening 17 of the discharge pipe joint 4.

[0054] like Figure 3-12As shown, the utility model is a safety valve that prevents leakage. In the sealed state of the safety valve, the valve sealing cover 1 is squeezed and sealed on the sealing pipe opening 17 of the discharge pipe joint 4, the stopper 19 is in a horizontal state, the valve sealing cover 1 is squeezed on the upper side of the stopper 19, and the lower side of the stopper 19 is squeezed on the upper end surface of the upper sleeve 7; the lifting spring 11 is in a compressed state. Since there is no flow of fluid medium in the safety valve, the fan device 6 is in a stationary state, and the scraper plate 13 is inside the discharge pipe joint 4, and has no contact with the valve sealing cover 1 and the sealing pipe opening 17 of the discharge pipe joint 4.

[0055] When the pressure in the system reaches the threshold set by the safety valve, the fluid medium enters the safety valve through the valve discharge pipe joint 4, squeezing the valve sealing cover 1 to lift it. When the valve sealing cover 1 is opened, the fluid medium squeezes the valve sealing cover 1 to lift it. The upper sleeve 7, pressure bearing 8, and support lifting sleeve 9 are squeezed by the lifting spring 11 and rise along with the valve sealing cover 11. The stopper 19 rotates around the hinge axis under the push of the upper sleeve 7, so that the stopper 19 is in a vertical state, and the upper end surface of the upper sleeve 7 is pressed against the valve sealing cover 1. The fluid medium leaks from the opening between the valve sealing cover 1 and the valve discharge pipe joint 4, and is then discharged from the discharge port 33 provided in the valve housing 29 of the safety valve.

[0056] During the lifting process of the support and lifting sleeve 9, the support and lifting sleeve 9 drives the scraper support frame 12 to be lifted. Under the limiting action of the fixed bracket 14, the scraper support frame 12 also moves outward during the lifting process. The scraper support frame 12 supports and drives the upper side of the scraper plate 13 to precisely fit the sealing surface on the valve sealing cover 1. At the same time, the lower side of the dynamic scraper plate 13 also fits the sealing pipe opening 17 of the discharge pipe joint 4. The power provided by the flow of the fluid medium through the safety valve drives the fan device 6 to rotate, and the fan device 6 drives the fan shaft 3 to rotate. The fan shaft 3 then drives the scraper plate 13 to rotate and scrape off impurities on the sealing surface of the valve sealing cover 1 and the discharge pipe joint 4. When the safety valve is closed, the valve sealing cover 1 and the discharge pipe joint 4 can be sealed and connected.

[0057] The utility model discloses a safety valve for preventing leakage. When the safety valve is opened, the power provided by the flow of the fluid medium in the safety valve drives the fan blade device 6 to rotate, the fan blade device 6 drives the fan blade shaft 3 to rotate, and the fan blade shaft 3 drives the scraper plate 13 to rotate to scrape off impurities on the sealing surface of the valve sealing cover 1 and the discharge pipe joint 4. The innovation of the utility model is that: the scraper support frame 12 for mounting the scraper plate 13 does not change its length, and the scraper plate 13 initially arranged in the valve discharge pipe joint 7 is accurately delivered to the sealing surface of the valve sealing cover 1 and the discharge pipe joint 4; and after the safety valve is closed, the scraper plate 13 needs to be retracted into the valve discharge pipe joint 7 in advance so as not to affect the valve closing.

[0058] Example 2

[0059] like Figure 3-14 As shown, the utility model is a safety valve to prevent leakage, based on the technology of the above embodiment, as Figure 13 As shown, the support and lifting sleeve 9 is surrounded by a scraper support frame mounting lug 22, and the scraper support frame mounting lug 22 is provided with a long connecting groove 23. The scraper support frame 12 is slidably connected to the long connecting groove 23 via a square connecting shaft 24. The scraper support frame 12 slides in the long connecting groove 23 via the square connecting shaft 24. Through the above design, the scraper support frame 12 can be controlled to slide in and out on the scraper support frame mounting lug 22.

[0060] The fan shaft support frame 5 comprises a connecting frame 25 and a shaft sleeve 26. Three connecting frames 25 are evenly spaced around the shaft sleeve 26. The outer ends of these connecting frames 25 are connected to the wall of the discharge pipe joint 4, and the fan shaft 3 is inserted into the shaft sleeve 26 via a bearing. The bottom surfaces of the connecting frames 25 are chamfered to reduce the resistance of the connecting frames 25 to the fluid entering the safety valve. Two scraper support frames 12 are movably mounted around the support and lifting sleeve 9.

[0061] Example 3

[0062] like Figure 3-14 As shown, the utility model is a safety valve to prevent leakage, based on the technology of the above embodiment, as Figure 14 As shown, the fixed sleeve 10 is fixedly mounted on the fan shaft 3. A fixed bracket ear 27 is provided around the fixed sleeve 10, and the fixed bracket ear 27 has a connection hole. The bottom end of the fixed bracket 14 is provided with a U-shaped bracket 28, which also has a connection hole. The fixed bracket 14 and the fixed bracket ear 27 are plugged into the corresponding connection holes by bolts. The fixed bracket 14 and the fixed bracket ear 27 are fixedly connected by tightening the bolts. Friction surfaces can be added to the inner surface of the U-shaped bracket 28 and the two side surfaces of the fixed bracket ear 27. After the bolts are tightened, the fixed bracket 14 will not rotate. The support angle of the fixed bracket 14 can also be adjusted as needed.

[0063] Example 4

[0064] like Figure 3-14 As shown, the utility model is a safety valve to prevent leakage, based on the technology of the above embodiment, as Figure 12 As shown, the top of the fan shaft 3 is provided with two symmetrical stopper mounting grooves 18, as shown in FIG. Figure 9As shown, a stopper 19 is installed in the stopper mounting groove 18 through a hinge shaft. When the valve sealing cover 1 is squeezed and sealed on the sealing pipe mouth 17 of the discharge pipe joint 4, the stopper 19 is in a horizontal state, the valve sealing cover 1 is squeezed on the upper side of the stopper 19, and the lower side of the stopper 19 is squeezed on the upper end face of the upper sleeve 7; when the valve sealing cover 1 is opened, the fluid medium squeezes the valve sealing cover 1 to lift, and the upper end sleeve 7, the pressure bearing 8 and the supporting lifting sleeve 9 are lifted along with the valve sealing cover 11 under the squeeze of the lifting spring 11, and the stopper 19 rotates around the hinge shaft under the push of the upper end sleeve 7, so that the stopper 19 is in a vertical state, and the upper end face of the upper end sleeve 7 is under low pressure on the valve sealing cover 1.

[0065] The upper end surface of the stopper 19 is a smooth surface inclined inwardly. When the valve sealing cover 1 is closed, the valve sealing cover 1 is pressed against the upper end surface of the stopper 19, and the stopper 19 rotates outward around the hinge axis and is laterally arranged in the stopper mounting groove 18.

[0066] The utility model discloses a safety valve for preventing leakage. When the pressure is released, the safety valve has a defect that the valve sealing cover 1 cannot be fully opened to release the pressure, which may lead to a safety accident. When the valve sealing cover 1 is opened, the utility model provides a lifting spring 11 on the fan shaft 3. The lifting spring 11 supports the lifting sleeve 9, the pressure bearing 8 and the upper sleeve 7 to assist in opening the valve sealing cover 1, so that the valve sealing cover 1 is opened as much as possible to release the pressure, thereby ensuring timely pressure relief safety.

[0067] Two symmetrical blocks 19 are provided at the top of the fan shaft 3. When the valve sealing cover 1 and the valve discharge pipe joint 7 are closed, the valve sealing cover 1 is squeezed onto the upper sleeve 7 by the laterally arranged blocks 19, so that the main elastic force of the lifting spring 11 is blocked by the laterally arranged blocks 19. The valve sealing cover 1 only needs a slight force on the blocks 19 to lock the elastic force of the lifting spring 11, thereby greatly reducing the influence of the lifting spring 11 on the safety valve when the safety valve is closed, and can play an auxiliary opening role when the safety valve is opened.

[0068] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A safety valve for preventing leakage, comprising a valve sealing cover (1), a valve elastic actuator (2), a fan shaft (3) and an inlet pipe joint (4), characterized in that: A fan shaft support frame (5) is provided in the discharge pipe joint (4), the fan shaft (3) is axially inserted on the fan shaft support frame (5) for rotation, a fan device (6) is provided at the lower end of the fan shaft (3), an upper sleeve (7), a pressure bearing (8), a support lifting sleeve (9) and a fixed sleeve (10) are sleeved on the upper part of the fan shaft (3) from top to bottom, a lifting spring (11) is provided in the support lifting sleeve (9) with its bottom end pressed on the fixed sleeve (10); a scraper support frame (12) is movably provided on the support lifting sleeve (9), the scraper support frame (12) and the support lifting sleeve (9) are arranged at a fixed angle, and a scraper plate (13) is provided on the top of the scraper support frame (12); A fixing bracket (14) is provided on the fixing sleeve (10) and surrounds the scraper support bracket (12), an arc-shaped limiting groove (15) is provided in the middle of the scraper support bracket (12), and a limiting column (16) inserted into the arc-shaped limiting groove (15) is provided on the top of the fixing bracket (14).

2. A safety valve for preventing leakage according to claim 1, characterized in that: Two symmetrical stopper mounting grooves (18) are provided at the top end of the fan blade rotating shaft (3), and a stopper (19) is mounted in the stopper mounting groove (18) via a hinge shaft.

3. The safety valve for preventing leakage according to claim 1, characterized in that: The scraper plate (13) is hinged to the top of the scraper support frame (12) via a rotating shaft (20), and a coil spring is provided on the rotating shaft (20).

4. A safety valve for preventing leakage according to claim 3, characterized in that: The scraper plate (13) is made of plastic, and scraper blades (21) are respectively provided on the upper side and the lower side of the scraper plate (13).

5. The safety valve for preventing leakage according to claim 1, characterized in that: A scraper support frame mounting lug (22) is provided around the support lifting sleeve (9), and a long connecting groove (23) is provided on the scraper support frame mounting lug (22). The scraper support frame (12) is slidably connected in the long connecting groove (23) via a square connecting shaft (24), and the scraper support frame (12) slides in the long connecting groove (23) via the square connecting shaft (24).

6. The safety valve for preventing leakage according to claim 1, characterized in that: The fan blade rotating shaft support frame (5) comprises a connecting frame (25) and a rotating shaft sleeve (26). Three connecting frames (25) are evenly distributed around the rotating shaft sleeve (26). The outer ends of the connecting frames (25) are connected to the pipe wall of the discharge pipe joint (4). The fan blade rotating shaft (3) is inserted into the rotating shaft sleeve (26) through a bearing.

7. A safety valve for preventing leakage according to claim 6, characterized in that: The bottom surface of the connecting frame (25) is chamfered.

8. The safety valve for preventing leakage according to claim 1, characterized in that: Two scraper support frames (12) are movably provided on the supporting lifting sleeve (9).

9. The safety valve for preventing leakage according to claim 1, characterized in that: The fixing sleeve (10) is fixedly sleeved on the fan blade rotating shaft (3), and a fixing bracket ear platform (27) is arranged around the fixing sleeve (10), and a connecting hole is provided on the fixing bracket ear platform (27). A U-shaped plug-in bracket (28) is provided at the bottom end of the fixing bracket (14), and a connecting hole is also provided on the U-shaped plug-in bracket (28). The fixing bracket (14) and the fixing bracket ear platform (27) are plugged into the corresponding connecting holes by bolts, and the fixing bracket (14) and the fixing bracket ear platform (27) are fixedly connected by tightening the bolts.

10. The safety valve for preventing leakage according to claim 1, characterized in that: The top end surface of the fan blade shaft (3) and the sealing pipe opening (17) of the discharge pipe joint (4) are in the same plane.

Images