Drain valve

Abstract

The utility model relates to a drain valve which comprises a valve body, a valve seat is arranged in the valve body, a cage sleeve is arranged on the valve seat, throttling holes are formed in the cage sleeve, a protective sleeve is arranged in the cage sleeve, a valve clack is arranged in the protective sleeve, a driving sleeve is arranged on the protective sleeve, and a first valve rod is arranged in the driving sleeve. A second valve rod is arranged at the top end of the first valve rod, a first wing plate is arranged on the driving sleeve, a second wing plate is arranged on the portion, above the first wing plate, of the second valve rod, and a plurality of adjusting lead screws distributed on the outer side of the central axis of the second valve rod in a star shape are arranged on the second wing plate and the first wing plate. Each adjusting lead screw is provided with a first nut, a spring, a first backing ring and a second nut. The cavitation phenomenon of the valve clack of the drain valve when the valve clack of the drain valve is in an open state can be reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of drainage equipment, specifically to a drainage valve. Background Technology

[0002] Power plant condensate drainage systems are divided into two main parts: thermal equipment condensate drainage and steam pipeline condensate drainage. Thermal equipment condensate drainage systems mainly include boiler body condensate drainage, turbine body condensate drainage, heater condensate drainage, and air heater condensate drainage systems. Steam pipeline condensate drainage systems mainly include main steam, reheat steam, bypass steam, extraction steam, and auxiliary steam pipeline condensate drainage systems. In most power plants, high-pressure heater emergency condensate drainage and other high-pressure condensate drainage are connected together to a backpack-type high-pressure body condensate expansion tank.

[0003] Due to the large volume, high temperature, and high pressure of high-pressure heater condensate in accidents, and the high velocity of the medium downstream of the steam trap (which is saturated water), cavitation is prone to occur, and flashing is a frequent phenomenon. Normal high-pressure heater condensate drainage is a staged drainage method, with the operating pressure of each stage increasing with the unit load. Each stage of water delivery is accompanied by a decrease in downstream pressure. Flashing occurs when the gaseous medium in the two-phase flow, after being throttled by the throttling device within the steam trap, directly impacts the sealing surface of the valve disc, causing a small portion of it to liquefy and then vaporize. Frequent flashing leads to cavitation damage on the valve disc's sealing surface, resulting in poor sealing and leakage. Therefore, there is room for improvement in the existing technology to reduce cavitation on the valve disc during opening, thereby increasing the durability of the valve disc and reducing maintenance frequency, thus promoting the marketability of the steam trap. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a steam trap that can reduce cavitation of the valve disc when the valve disc is open, thereby overcoming the defects in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a drain valve, including a valve body, a valve seat is provided in the valve body, a cage is provided on the valve seat, a throttling orifice is provided on the cage, a protective sleeve is provided inside the cage, a valve disc is provided inside the protective sleeve, the valve disc and the protective sleeve are both in contact with the valve seat, a drive sleeve is provided on the protective sleeve, a first valve stem is provided inside the drive sleeve, the bottom end of the first valve stem is connected to the valve disc, a second valve stem is provided on the top end of the first valve stem, a first wing plate is provided on the drive sleeve, a second wing plate is provided on the second valve stem above the first wing plate, an adjusting screw is provided on the second wing plate and the first wing plate, the number of adjusting screws is several, the several adjusting screws are evenly distributed in a star shape on the outer side of the central axis of the second valve stem, the several adjusting screws on both sides of the second wing plate are respectively provided with a first nut, the several adjusting screws on the side of the second wing plate away from the first wing plate are respectively provided with a spring, a first washer and a second nut along the direction from near the second wing plate to away from the second wing plate.

[0006] Preferably, both the first valve stem and the second valve stem adopt a round rod structure, and the drive sleeve adopts a round tube structure. The central axis of the second valve stem, the central axis of the first valve stem, and the central axis of the drive sleeve are located on the same axis. The diameter of the second valve stem is not greater than the diameter of the first valve stem. A first sealing packing is fitted on the second valve stem. A first packing sleeve is provided on the second valve stem on the side of the first sealing packing away from the first valve stem. The first packing sleeve and the second valve stem are threaded together. The bottom of the first sealing packing and the first packing sleeve are both located inside the drive sleeve.

[0007] Preferably, a driving block is provided on the first packing sleeve above the driving sleeve. The driving block adopts a polygonal tubular structure, and the inner wall of the driving tube is connected to the outer wall of the first packing sleeve.

[0008] Preferably, the number of throttling orifices is several, and the several throttling orifices are distributed in a spiral shape on the cage sleeve.

[0009] Preferably, the bottom end of the drive sleeve is located in the inner cavity of the protective sleeve, the protective sleeve adopts a cylindrical structure, the upper part of the valve disc adopts a convex-shaped structure composed of a small end and a large end set below the small end, the small end of the upper part of the valve disc is located in the inner cavity of the drive sleeve, the large end of the upper part of the valve disc is located in the protective sleeve, and an movable gap is provided between the large end of the upper part of the valve disc and the drive sleeve.

[0010] Preferably, the valve body above the cage sleeve is provided with a cage sleeve pressure ring, a second gasket, a second sealing packing, and a second packing sleeve in sequence along the direction from near to far from the cage sleeve. The cage sleeve pressure ring, the second gasket, the second sealing packing, and the second packing sleeve are all fitted onto the drive sleeve. The drive sleeve above the second packing sleeve is provided with a packing pressure plate. Adjusting bolts are provided on the packing pressure plate and the valve body. The number of adjusting bolts is several, and the several adjusting bolts are distributed in a star shape on the outer side of the central axis of the drive sleeve.

[0011] The beneficial effects of this utility model are as follows: During the opening and closing processes of this product, since the valve disc is always located inside the protective sleeve, the gas phase flow after throttling through several throttling orifices comes into contact with the protective sleeve. The flashing phenomenon occurs on the protective sleeve, reducing the probability that the throttled gas phase flow will directly contact the valve disc, thereby reducing the probability of cavitation on the valve disc and improving the durability of the valve disc.

[0012] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0014] like Figure 1As shown, a steam trap includes a valve body 1, a valve seat 2 inside the valve body 1, a cage sleeve 3 on the valve seat 2, a throttling orifice 4 on the cage sleeve 3, a protective sleeve 5 inside the cage sleeve 3, and a valve disc 6 inside the protective sleeve 5. Both the valve disc 6 and the protective sleeve 5 are fitted to the valve seat 2. A drive sleeve 7 is provided on the protective sleeve 5, and a first valve stem 8 is provided inside the drive sleeve 7. The bottom end of the first valve stem 8 is connected to the valve disc 6, and a second valve stem 9 is provided at the top end of the first valve stem 8. A first wing plate 10 is provided on the drive sleeve 7, and the second valve stem 9 is located above the first wing plate 10. A second wing plate 11 is provided on the valve stem 9. Adjusting screws 12 are provided on both the second wing plate 11 and the first wing plate 10. Several adjusting screws 12 are evenly distributed in a star shape on the outer side of the central axis of the second valve stem 9. Each adjusting screw 12 on both sides of the second wing plate 11 is provided with a first nut 13. On the side of the second wing plate 11 away from the first wing plate 10, several adjusting screws 12 are provided with a spring 14, a first washer 15, and a second nut 16 along the direction from near to away from the second wing plate 11. The bottom end of the drive sleeve 7 is located in the inner cavity of the protective sleeve 5. The protective sleeve 5 has a cylindrical structure. The upper part of the valve disc 6 has a convex structure composed of a small end and a large end located below the small end. The small end of the upper part of the valve disc 6 is located in the inner cavity of the drive sleeve 7, and the large end of the upper part of the valve disc 6 is located inside the protective sleeve 5. A movable gap is provided between the large end of the upper part of the valve disc 6 and the drive sleeve 7.

[0015] The first valve stem 8 and the second valve stem 9 both adopt a round rod structure, and the drive sleeve 7 adopts a round tubular structure. The central axis of the second valve stem 9, the central axis of the first valve stem 8, and the central axis of the drive sleeve 7 are located on the same axis. The diameter of the second valve stem 9 is not greater than the diameter of the first valve stem 8. A first sealing packing 17 is fitted on the second valve stem 9. A first packing sleeve 18 is provided on the side of the second valve stem 9 away from the first valve stem 8. The first packing sleeve 18 and the second valve stem 9 are threaded together. The bottoms of the first sealing packing 17 and the first packing sleeve 18 are both located inside the drive sleeve 7. Installing the first sealing packing 17 helps to reduce the gap between the second valve stem 9 and the drive sleeve 7, thereby reducing the leakage of the medium from the second valve stem 9 and the drive sleeve 7. Installing the first packing sleeve 18 helps to cause the first sealing packing 17 to deform again, thereby resealing the gap between the second valve stem 9 and the drive sleeve 7. Furthermore, a driving block 19 is provided on the first packing sleeve 18 above the driving sleeve 7. The driving block 19 adopts a polygonal tubular structure, and the inner wall of the driving sleeve 7 is connected to the outer wall of the first packing sleeve 18. The driving block 19 facilitates the rotation of the driving sleeve 7, thereby using the threaded connection between the driving sleeve 7 and the second valve stem 9 to cause the first packing sleeve 18 to move towards the first sealing packing 17.

[0016] Inside the valve body 1 above the cage sleeve 3, a cage sleeve pressure ring 20, a second gasket 21, a second sealing packing 22, and a second packing sleeve 23 are sequentially arranged along the direction from near to far from the cage sleeve 3. The cage sleeve pressure ring 20, the second gasket 21, the second sealing packing 22, and the second packing sleeve 23 are all fitted onto the drive sleeve 7. A packing pressure plate 24 is provided on the drive sleeve 7 above the second packing sleeve 23. Adjusting bolts 25 are provided on the packing pressure plate 24 and the valve body 1. Several adjusting bolts 25 are arranged in a star shape on the outer side of the central axis of the drive sleeve 7. Installing the second sealing packing 22 facilitates reducing the gap between the drive sleeve 7 and the valve body 1. Furthermore, both the first sealing packing 17 and the second sealing packing 22 are annular structures made of graphite. The second packing sleeve 23 adopts a cylindrical structure. The outer diameter of the top of the second packing sleeve 23 gradually increases as the height of the second packing sleeve 23 decreases. The shape of the bottom part of the packing plate 24 matches the shape of the top of the second packing sleeve 23. This facilitates the use of the top of the second packing sleeve 23 and the bottom part of the packing plate 24 to form a guide, causing the second packing sleeve 23 to move towards the second sealing packing 22, thereby causing the second sealing packing 22 to deform again, so as to reduce the gap between the drive sleeve 7 and the valve body 1.

[0017] The number of throttling orifices 4 is several, and these orifices 4 are spirally distributed on the cage sleeve 3. This allows the number of throttling orifices 4 blocked by the protective sleeve 5 to gradually decrease as the valve disc 6 and the protective sleeve 5 gradually rise in position, and the flow rate of the medium through the throttling orifices 4 per unit time gradually increases. When the position of the valve disc 6 and the protective sleeve 5 rises to its maximum, the flow rate of the medium through the throttling orifices 4 per unit time reaches its maximum value.

[0018] The specific use of this product includes the opening and closing processes, such as... Figure 1As shown, the opening process of this product includes the following steps: First, the second valve stem 9 moves away from the valve seat 2, simultaneously driving the first valve stem 8 and valve disc 6 to move in the same direction. During this process, the valve disc 6 gradually detaches from the valve seat 2 and then moves together with the first valve stem 8. During this process, the compression of several springs 14 gradually decreases. Then, when the large end of the valve disc 6 contacts the bottom end of the drive sleeve 7, the valve disc 6 drives the drive sleeve 7 and the protective sleeve 5 to move away from the valve seat 2, and the compression of several springs 14 is at its minimum value. During this process, the large end of the valve disc 6 is completely located in the inner cavity of the protective sleeve 5. As the protective sleeve 5 gradually moves upward, the number of throttling orifices 4 blocked by the protective sleeve 5 gradually decreases, and the upstream medium is transported from the inlet end of the valve body 1 through the throttling orifice 4 located below the protective sleeve 5 and the inner cavity of the valve seat 2 to the outlet end of the valve body 1 and discharged into the downstream system. When the protective sleeve 5 comes into contact with the cage sleeve pressure ring 20, the protective sleeve 5 reaches the maximum opening position. At this time, several throttling holes 4 are located below the protective sleeve 5.

[0019] The closing process of this product includes the following steps: First, the second valve stem 9 moves towards the side closer to the valve seat 2, simultaneously driving the first valve stem 8 and valve disc 6 to move in the same direction. During this process, several springs 14 provide elastic force, thereby driving the drive sleeve 7 and protective sleeve 5 to move in the same direction as the first valve stem 8 and valve disc 6. During this process, the large end of the valve disc 6 is always in contact with the bottom end of the drive sleeve 7. Then, as the protective sleeve 5 gradually approaches the valve seat 2, several throttling orifices 4 are gradually blocked by the protective sleeve 5. When the protective sleeve 5 and the valve seat 2 are in contact, all several throttling orifices 4 are blocked by the protective sleeve 5. The second valve stem 9 continues to move towards the side closer to the valve seat 2, driving the first valve stem 8 and valve disc 6 to move in the same direction. During this process, the valve disc 6 gradually approaches the valve seat 2, and several springs 14 are gradually compressed. When the valve disc 6 is in contact with the valve seat 2, the compression of several springs 14 is at its maximum value. At this time, the product is in a closed state, and a seal is formed between the valve disc 6 and the valve seat 2. It is necessary to continuously apply force to the second valve stem 9 to maintain the fit between the valve disc 6 and the valve seat 2.

[0020] In this embodiment, during the opening and closing processes of this product, since the valve disc 6 is always located inside the protective sleeve 5, the gas phase flow after being throttled by several throttling orifices 4 comes into contact with the protective sleeve 5. The flashing phenomenon occurs on the protective sleeve 5, which reduces the probability that the throttled gas phase flow will directly contact the valve disc 6, thereby reducing the probability of cavitation on the valve disc 6 and improving the durability of the valve disc 6.

[0021] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A steam trap, characterized in that: The valve body (1) includes a valve seat (2) inside the valve body (1), a cage sleeve (3) on the valve seat (2), a throttling orifice (4) on the cage sleeve (3), a protective sleeve (5) inside the cage sleeve (3), a valve disc (6) inside the protective sleeve (5), the valve disc (6) and the protective sleeve (5) are both in contact with the valve seat (2), a drive sleeve (7) on the protective sleeve (5), a first valve stem (8) inside the drive sleeve (7), the bottom end of the first valve stem (8) is connected to the valve disc (6), a second valve stem (9) is provided on the top end of the first valve stem (8), a first wing plate (10) is provided on the drive sleeve (7), and a second valve stem (9) is provided on the top end of the first wing plate (10). A second wing plate (11) is provided on the second valve stem (9). An adjusting screw (12) is provided on the second wing plate (11) and the first wing plate (10). The number of adjusting screws (12) is several. The several adjusting screws (12) are distributed in a star shape on the outside of the central axis of the second valve stem (9). The several adjusting screws (12) on both sides of the second wing plate (11) are respectively provided with a first nut (13). The several adjusting screws (12) on the side of the second wing plate (11) away from the first wing plate (10) are respectively provided with a spring (14), a first washer (15) and a second nut (16) along the direction from near the second wing plate (11) to away from the second wing plate (11).

2. The steam trap according to claim 1, characterized in that: The first valve stem (8) and the second valve stem (9) are both rod-shaped structures, and the drive sleeve (7) is a tubular structure. The central axis of the second valve stem (9), the central axis of the first valve stem (8) and the central axis of the drive sleeve (7) are on the same axis. The diameter of the second valve stem (9) is not greater than the diameter of the first valve stem (8). The second valve stem (9) is fitted with a first sealing packing (17). The second valve stem (9) on the side of the first sealing packing (17) away from the first valve stem (8) is provided with a first packing sleeve (18). The first packing sleeve (18) and the second valve stem (9) are threaded together. The bottom of the first sealing packing (17) and the first packing sleeve (18) are both located inside the drive sleeve (7).

3. The steam trap according to claim 2, characterized in that: A driving block (19) is provided on the first packing sleeve (18) above the driving sleeve (7). The driving block (19) adopts a multi-prism tubular structure, and the inner wall of the driving tube () is connected to the outer wall of the first packing sleeve (18).

4. The steam trap according to claim 1, characterized in that: The number of throttling orifices (4) is several, and the several throttling orifices (4) are distributed in a spiral shape on the cage (3).

5. The steam trap according to claim 1, characterized in that: The bottom end of the drive sleeve (7) is located in the inner cavity of the protective sleeve (5). The protective sleeve (5) adopts a cylindrical structure. The upper part of the valve disc (6) adopts a convex-shaped structure composed of a small end and a large end set below the small end. The small end of the upper part of the valve disc (6) is located in the inner cavity of the drive sleeve (7), and the large end of the upper part of the valve disc (6) is located inside the protective sleeve (5). There is an movable gap between the large end of the upper part of the valve disc (6) and the drive sleeve (7).

6. The steam trap according to claim 1, characterized in that: Inside the valve body (1) above the cage sleeve (3), a cage sleeve pressure ring (20), a second gasket (21), a second sealing packing (22), and a second packing sleeve (23) are arranged sequentially along the direction from near the cage sleeve (3) to away from the cage sleeve (3). The cage sleeve pressure ring (20), the second gasket (21), the second sealing packing (22), and the second packing sleeve (23) are all fitted onto the drive sleeve (7). A packing pressure plate (24) is provided on the drive sleeve (7) above the second packing sleeve (23). Adjusting bolts (25) are provided on the packing pressure plate (24) and the valve body (1). The number of adjusting bolts (25) is several, and the several adjusting bolts (25) are distributed in a star shape on the outside of the central axis of the drive sleeve (7).

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