Large-diameter safety valve

Abstract

The utility model relates to the field of valves, and discloses a large-caliber safety valve which comprises a valve body, a valve rod, a valve element, a spring, an upper abutting plate, a lower abutting plate and an adjusting screw rod, the valve rod is installed in the valve body in a sliding mode, the valve element is fixed at the bottom end of the valve rod, the lower abutting plate is fixed at the top end of the valve rod and installed in the valve body in a sliding mode, and the upper abutting plate is installed in the valve body in a sliding mode. The safety valve further comprises a top cover, a threaded sleeve, a rotary disc, a planetary mechanism and a driving rod, the top cover is fixed to the top of the valve body, one end of the threaded sleeve is fixed to the upper abutting plate, the other end of the threaded sleeve extends out of the valve body, one end of the adjusting screw is in threaded connection with the threaded sleeve, and the other end of the adjusting screw is fixed to the rotary disc. The rotating disc and the driving rod are rotationally installed on the top cover, and the planetary mechanism is installed between the rotating disc and the driving rod. The planetary mechanism is used as a transmission structure to achieve the purpose of saving labor, the original occupied space of the safety valve cannot be increased too much by adopting the planetary mechanism, and the safety valve is practical.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a large-caliber safety valve. Background Art

[0002] A safety valve is a relatively special valve, which is mainly used to discharge the fluid medium in the pipeline so that the pressure in the pipeline will not exceed the standard. A large-diameter safety valve refers to a type of safety valve with a relatively large inner diameter of the pipeline at the inlet and outlet of the fluid.

[0003] Spring-loaded safety valve is a common safety valve, mainly including valve body, valve core, valve stem, spring, valve cover and adjusting screw. The opening and closing action of spring-loaded safety valve depends on the change of medium pressure at its inlet end and the spring preload force to make the valve core open and close automatically. When the medium pressure rises to be greater than the spring preload force, the valve core will automatically open to overcome the spring preload force, discharge the excess medium and reduce the internal pressure. Due to the effect of spring force, when the internal pressure drops to the safe value, the valve core will automatically close and the discharge will stop.

[0004] Spring-loaded safety valves mainly adjust the preload of the spring by manually turning the adjusting screw to control the pressure of the fluid medium in the pipeline. However, for large-diameter safety valves, the pressure of the internal fluid medium is usually high, which makes it more laborious to manually turn the adjusting screw. Summary of the invention

[0005] In view of this, the purpose of the utility model is to provide a large-diameter safety valve to solve the problem pointed out in the background technology that for large-diameter safety valves, the pressure of the internal fluid medium is usually high, which makes it more laborious to manually turn the adjustment screw.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] A large-caliber safety valve comprises a valve body, a valve stem, a valve core, a spring, an upper abutment plate, a lower abutment plate and an adjusting screw, the valve stem being slidably installed in the valve body, the valve core being fixed at the bottom end of the valve stem, the lower abutment plate being fixed at the top end of the valve stem and slidably installed in the valve body, the upper abutment plate being slidably installed in the valve body, the spring being installed between the upper abutment plate and the lower abutment plate, the safety valve also comprises a top cover, a threaded sleeve, a turntable, a planetary mechanism and a drive rod, the top cover being fixed on the top of the valve body, one end of the threaded sleeve being fixed on the upper abutment plate, and the other end extending out of the valve body, one end of the adjusting screw being threadedly connected to the threaded sleeve, and the other end being fixed to the turntable, the turntable and the drive rod are both rotatably installed on the top cover, and the planetary mechanism transmission is installed between the turntable and the drive rod.

[0008] Furthermore, the planetary mechanism includes an inner ring gear, a sun gear and planetary gears; the inner ring gear is fixed on the turntable and is arranged coaxially with the turntable; the sun gear is fixed on the driving rod and is located at the center of the inner ring gear; the planetary gear is rotatably installed on the top cover and is located between the inner ring gear and the sun gear, the outer side of the planetary gear is meshed with the inner ring gear, and the inner side of the planetary gear is meshed with the sun gear.

[0009] Furthermore, the diameter of the planetary gear is greater than the diameter of the sun gear.

[0010] Furthermore, one end of the driving rod away from the sun gear extends to the outside of the top cover and is fixed with a hand wheel.

[0011] Furthermore, the diameter of the hand wheel is greater than the diameter of the sun wheel.

[0012] Furthermore, a vertical limit sliding groove is provided in the valve body, a limit sliding block is fixed on the upper abutment plate, and the limit sliding block is slidably installed in the limit sliding groove.

[0013] Furthermore, a lower abutment pad is installed on the upper side of the lower abutment plate, an upper abutment pad is installed on the lower side of the upper abutment plate, the upper end of the spring abuts on the upper abutment pad, and the lower end of the spring abuts on the lower abutment pad.

[0014] Beneficial effects of the utility model:

[0015] Through the technical solution of the present application, when the preload force of the spring needs to be adjusted, the driving rod can be directly rotated, and the driving rod drives the turntable to rotate through the transmission action of the planetary mechanism, and the turntable drives the adjusting screw to rotate, thereby driving the upper plate to move in the vertical direction through the threaded sleeve, thereby adjusting the preload force of the spring. Through such a setting, the planetary mechanism can be used as a transmission structure to achieve the purpose of labor saving, and the use of the planetary mechanism will not increase the original space occupied by the safety valve too much, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a safety valve in an embodiment of the present application;

[0017] Figure 2 is a cross-sectional view of a safety valve in an embodiment of the present application;

[0018] Figure 3 is a cross-sectional view showing a planetary mechanism in an embodiment of the present application;

[0019] Among them, 1. valve body; 2. valve stem; 3. valve core; 4. spring; 5. upper abutment plate; 6. adjusting screw; 7. pressure reducing port; 8. pressure reducing chamber; 9. installation chamber; 10. top cover; 11. threaded sleeve; 12. turntable; 13. drive rod; 14. inner ring gear; 15. sun gear; 16. planetary gear; 17. handwheel; 18. limit slide groove; 19. limit slider; 20. lower abutment pad; 21. upper abutment pad; 22. lower abutment plate. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures 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 in the figures may be omitted.

[0021] The same or similar numbers in the figures 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", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they 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 figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] like Figure 1-Figure 3 As shown, the embodiment of the present application provides a large-caliber safety valve, which mainly includes a valve body 1, a valve stem 2, a valve core 3, a spring 4, an upper abutment plate 5, a lower abutment plate 22 and an adjusting screw 6. The valve body 1 is provided with a pressure relief port 7, a pressure relief chamber 8 and an installation chamber 9. The valve stem 2 is slidably installed in the valve body 1 along the vertical direction. The valve core 3 is fixed to the bottom end of the valve stem 2, is located in the pressure relief chamber 8, and can block the pressure relief port 7. The lower abutment plate 22 is fixed to the top end of the valve stem 2, and is slidably installed in the installation chamber 9 of the valve body 1, and the upper abutment plate 5 is also slidably installed in the installation chamber 9 of the valve body 1. The spring 4 is installed between the upper abutment plate 5 and the lower abutment plate 22. It should be noted that the above structures are all prior arts, and the remaining structures and working principles of the safety valve will not be described in detail in this embodiment.

[0023] In this embodiment, the safety valve further includes a top cover 10, a threaded sleeve 11, a turntable 12, a planetary mechanism and a drive rod 13. The top cover 10 is fixed to the top of the valve body 1 through a flange. The threaded sleeve 11 has an internal thread inside, the lower end of the threaded sleeve 11 is fixed to the upper plate 5, and the upper end extends to the outside of the valve body 1 and enters the inside of the top cover 10. The lower end of the adjusting screw 6 extends into the threaded sleeve 11 and is threadedly connected to the threaded sleeve 11, and the upper end is fixed to the turntable 12. The turntable 12 and the drive rod 13 are both rotatably mounted on the top cover 10 through bearings. The planetary mechanism is installed in the top cover 10, and the transmission is installed between the turntable 12 and the drive rod 13. The drive rod 13 can drive the turntable 12 to rotate through the transmission action of the planetary mechanism.

[0024] Through the above technical solution, when the preload force of the spring 4 needs to be adjusted, the driving rod 13 can be directly rotated, and the driving rod 13 drives the turntable 12 to rotate through the transmission effect of the planetary mechanism, and the turntable 12 drives the adjusting screw 6 to rotate, thereby driving the upper support plate 5 to move in the vertical direction through the threaded sleeve 11, so as to adjust the preload force of the spring 4. Through such a setting, the planetary mechanism can be used as a transmission structure to achieve the purpose of labor saving, and the use of the planetary mechanism will not increase the original space occupied by the safety valve too much, which is more practical.

[0025] In this embodiment, the planetary mechanism includes an inner gear ring 14, a sun gear 15 and a planetary gear 16. The inner gear ring 14 is an annular ring with a rack on the inner ring, and the inner gear ring 14 is fixed on the turntable 12 and is arranged coaxially with the turntable 12. The sun gear 15 is fixed on the driving rod 13 and is located at the center of the inner gear ring 14. The planetary gear 16 is rotatably mounted on the top cover 10 through the rotating shaft, and is located between the inner gear ring 14 and the sun gear 15. The outer side of the planetary gear 16 is meshed with the inner gear ring 14, and the inner side of the planetary gear 16 is meshed with the sun gear 15. Since the diameter of the inner gear ring 14 is much larger than the diameters of the sun gear 15 and the planetary gear 16, the sun gear 15 is used as the main power, and the inner gear ring 14 is driven to rotate by the planetary gear 16, so that the purpose of saving effort can be achieved.

[0026] In another embodiment, a plurality of identical planetary gears 16 may be provided, and the plurality of planetary gears 16 may be arranged in a circular array structure to enhance the stability of the planetary mechanism.

[0027] In this embodiment, the diameter of the planetary gear 16 is set to be larger than the diameter of the sun gear 15. By setting it in this way, in the entire planetary mechanism, the diameter of the inner ring 14 is larger than the diameter of the planetary gear 16, and the diameter of the planetary gear 16 is also larger than the diameter of the sun gear 15, which can achieve two-stage labor saving.

[0028] In this embodiment, one end of the driving rod 13 away from the sun gear 15 extends to the outside of the top cover 10, and is fixed with a hand wheel 17, the diameter of which is larger than the diameter of the sun gear 15. By turning the hand wheel 17, the driving rod 13 can be driven to rotate; and the diameter of the hand wheel 17 is set to be larger than the diameter of the sun gear 15, which can also achieve the purpose of labor saving.

[0029] In this embodiment, a vertical limit slide groove 18 is provided in the installation chamber 9 of the valve body 1, and a limit slider 19 is fixed on the upper abutment plate 5, and the limit slider 19 is slidably installed in the limit slide groove 18. Through the cooperation between the limit slider 19 and the limit slide groove 18, the upper abutment plate 5 can be slidably installed inside the valve body 1 along the vertical direction.

[0030] In this embodiment, a lower abutment pad 20 is installed on the upper side of the lower abutment plate 22, and an upper abutment pad 21 is installed on the lower side of the upper abutment plate 5. The upper abutment pad 21 and the lower abutment pad 20 are preferably rubber pads. The upper end of the spring 4 abuts on the upper abutment pad 21, and the lower end of the spring 4 abuts on the lower abutment pad 20. The spring 4 can be better installed by the mutual cooperation of the upper abutment pad 21 and the lower abutment pad 20.

[0031] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A large-caliber safety valve, comprising a valve body (1), a valve stem (2), a valve core (3), a spring (4), an upper abutment plate (5), a lower abutment plate (22) and an adjusting screw (6), wherein the valve stem (2) is slidably mounted in the valve body (1), the valve core (3) is fixed to the bottom end of the valve stem (2), the lower abutment plate (22) is fixed to the top end of the valve stem (2) and slidably mounted in the valve body (1), the upper abutment plate (5) is slidably mounted in the valve body (1), and the spring (4) is mounted between the upper abutment plate (5) and the lower abutment plate (22), characterized in that: The safety valve further comprises a top cover (10), a threaded sleeve (11), a rotating disk (12), a planetary mechanism and a driving rod (13); the top cover (10) is fixed on the top of the valve body (1); one end of the threaded sleeve (11) is fixed on the upper support plate (5), and the other end extends outside the valve body (1); one end of the adjusting screw (6) is threadedly connected to the threaded sleeve (11), and the other end is fixed to the rotating disk (12); the rotating disk (12) and the driving rod (13) are both rotatably mounted on the top cover (10), and the planetary mechanism is transmission-mounted between the rotating disk (12) and the driving rod (13).

2. A large-diameter safety valve according to claim 1, characterized in that: The planetary mechanism comprises an inner gear ring (14), a sun gear (15) and a planetary gear (16); the inner gear ring (14) is fixed on the rotating disk (12) and is arranged coaxially with the rotating disk (12); the sun gear (15) is fixed on the driving rod (13) and is located at the center of the inner gear ring (14); the planetary gear (16) is rotatably mounted on the top cover (10) and is located between the inner gear ring (14) and the sun gear (15); the outer side of the planetary gear (16) is meshed with the inner gear ring (14), and the inner side of the planetary gear (16) is meshed with the sun gear (15).

3. A large-diameter safety valve according to claim 2, characterized in that: The diameter of the planetary gear (16) is greater than the diameter of the sun gear (15).

4. A large-diameter safety valve according to claim 2, characterized in that: One end of the driving rod (13) away from the sun gear (15) extends to the outside of the top cover (10) and is fixed with a hand wheel (17).

5. A large-diameter safety valve according to claim 4, characterized in that: The diameter of the hand wheel (17) is greater than the diameter of the sun wheel (15).

6. A large-diameter safety valve according to any one of claims 1 to 5, characterized in that: A vertical limit slide groove (18) is provided in the valve body (1), a limit slide block (19) is fixed on the upper abutment plate (5), and the limit slide block (19) is slidably installed in the limit slide groove (18).

7. A large-diameter safety valve according to claim 6, characterized in that: A lower abutment pad (20) is installed on the upper side of the lower abutment plate (22), an upper abutment pad (21) is installed on the lower side of the upper abutment plate (5), the upper end of the spring (4) abuts against the upper abutment pad (21), and the lower end of the spring (4) abuts against the lower abutment pad (20).

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