Multi-nozzle steam pressure adapter

Abstract

The utility model relates to a kind of multi-nozzle steam pressure matchers, including high-pressure steam chamber and pressure matcher shell, the high-pressure steam chamber is provided with several nozzles and sealing end cap, each nozzle and sealing end cap are respectively provided with valve stem, each nozzle and pressure matcher shell are respectively provided with mixed steam guide pipe, each mixed steam guide pipe is respectively provided with reducing guide pipe inside, each reducing guide pipe is respectively provided with expansion mixing pipe, each nozzle and sealing end cap are respectively provided with fixing device, the fixing device includes the limiting pressure sleeve set on nozzle, compression spring, installation slot, first locating ring, locating plate, connecting rod and first adjusting nut. It can be installed to preset position conveniently. The utility model is convenient to use, with extensive market prospect.

Description

Technical Field

[0001] This utility model relates to a multi-nozzle steam pressure matching device, specifically a multi-nozzle steam pressure matching device. Background Technology

[0002] The jet technology used in steam turbine pressure matching devices allows for the direct mixing of high-pressure, high-temperature fluids with low-pressure, low-temperature fluids, offering unique advantages. Firstly, it increases the thermal power generation of the steam turbine; secondly, it transforms non-adjustable steam extraction into adjustable steam extraction. The basic theoretical research on jet technology was largely completed in the 1960s, and its application in industrial practice began gradually, primarily in vacuum systems. Its application as a thermal compressor is a relatively recent development, occurring only in the last 20 years. In steam power systems, jet technology offers unique advantages for thermal compression. Although jet compression involves the direct mixing of high-pressure, high-temperature fluids with low-pressure, low-temperature fluids, increasing irreversible losses, its advantages over mechanical compressors include simpler structure, lower cost, and less maintenance. Furthermore, its thermal energy utilization rate is comparable to, and in some cases, even higher than, that of mechanical compressors. Due to the unique advantages of jet-type thermal compressors, they have gained widespread use in recovering exhaust steam and increasing low pressure. In particular, their use as pressure matching devices for heating steam turbines has achieved considerable efficiency and a promising market outlook.

[0003] The pressure matcher mixes high-pressure and low-pressure steam streams by delivering high-pressure steam to the high-pressure chamber, where it is throttled by nozzles and then transported to the low-pressure chamber. The steam mixes with the low-pressure steam in the low-pressure chamber to obtain steam at a suitable pressure, which is then delivered to the turbine unit. However, during the throttling process of the high-pressure steam stream through the nozzles, cavitation occurs on the nozzles due to pressure changes. Therefore, the nozzles on the pressure matcher are frequently replaced and are easily worn parts. When the nozzles have been used for a preset time, they need to be replaced. Adjusting the nozzle opening size relies on adjusting the gap between the nozzle and the valve stem. Since there is an installation relationship between the nozzle and the valve stem, locating the nozzle and valve stem during nozzle replacement requires repeated adjustments to achieve the optimal position for maintenance. Therefore, the existing technology has room for improvement, aiming to simplify the nozzle replacement process, facilitate the installation of the nozzle in the preset position, improve maintenance efficiency, and thus enhance the product's market competitiveness. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a multi-nozzle steam pressure matching device that facilitates the installation of nozzles at preset positions, thereby overcoming the deficiencies in existing technologies.

[0005] The technical solution adopted by this utility model is as follows: a multi-nozzle steam pressure matching device, including a high-pressure steam chamber and a pressure matching device housing. Several nozzles arranged in a star shape on the outer side of the central axis of the pressure matching device housing are provided on the end of the high-pressure steam chamber near the nozzles. A sealing end cap is provided on the end of the high-pressure steam chamber away from the nozzles. A valve stem is provided on each nozzle and the sealing end cap. A mixing steam guide pipe is provided on the outlet end of each nozzle and the pressure matching device housing. A shrinkage guide pipe is provided inside the end of each mixing steam guide pipe near the pressure matching device housing. An expansion mixing pipe is provided on each shrinkage guide pipe. A fixing device is provided on each nozzle and the sealing end cap. The fixing device includes a limiting sleeve on the nozzle, a compression spring between the limiting sleeve and the nozzle, a mounting groove on the sealing end cap on one side of the limiting sleeve, a first positioning ring in the mounting groove, a positioning plate on the first positioning ring and the adjacent valve stem, several connecting rods arranged in a star shape around the adjacent valve stem on the positioning plate and the limiting sleeve, and a first adjusting nut on each connecting rod.

[0006] Preferably, a high-pressure steam delivery pipe is provided on the high-pressure steam chamber between the sealing end cap and the plurality of nozzles; a low-pressure steam delivery pipe is provided on each mixing steam guide pipe between the high-pressure steam chamber and the pressure matching device housing; a first connecting sleeve is provided on the plurality of shrinking guide pipes and the plurality of mixing steam guide pipes; a first connecting ring is provided on the plurality of mixing steam guide pipes, the first connecting sleeve and the pressure matching device housing; and a second connecting sleeve is provided between the end of the plurality of expanding mixing pipes away from the shrinking guide pipe and the pressure matching device housing.

[0007] Preferably, a rectifier orifice plate is provided inside the pressure matching device housing on the side of the second connecting sleeve away from the plurality of expansion mixing pipes. The pressure matching device housing includes, in sequence, a first straight pipe section, a shrinkage pipe section, and a second straight pipe section along the direction from near the high-pressure steam chamber to away from the high-pressure steam chamber. The inner diameter of the shrinkage pipe section gradually decreases along the direction from the first straight pipe section to the second straight pipe section. The inner diameter of the second straight pipe section corresponds to the minimum inner diameter of the shrinkage pipe section, and the inner diameter of the first straight pipe section corresponds to the maximum inner diameter of the shrinkage pipe section. The plurality of expansion mixing pipes, the second connecting sleeve, and the rectifier orifice plate are all installed inside the first straight pipe section.

[0008] Preferably, each valve stem at the end of the sealing end cap away from the nozzle is provided with an extension neck, each extension neck is provided with a valve stem sealing groove, each valve stem is provided with a first sealing packing layer located inside the valve stem sealing groove, each valve stem is provided with a packing sleeve on the valve stem sealing groove outside each first sealing packing layer and on the adjacent valve stem, each valve stem outside the packing sleeve is provided with a packing pressure plate, several extension necks are provided with connecting plates, each extension neck is provided with a limit ring on the outside, several limit rings abut against the connecting plates, and each packing pressure plate and connecting plate is provided with several adjusting bolts distributed in a star shape around the outside of the adjacent valve stem.

[0009] Preferably, a second sealing packing layer is provided between the sealing end cap and the high-pressure steam chamber. A packing pressure ring is provided on the sealing end cap outside the second sealing packing layer. An annular groove is provided in the high-pressure steam chamber on the side of the sealing end cap away from the pressure matching device housing. Several limiting blocks are provided in the groove, and the limiting blocks abut against the packing pressure ring. An outer cover is provided on the high-pressure steam chamber on the side of the limiting blocks away from the packing pressure ring. Push bolts are provided on the outer cover and the connecting plate.

[0010] Preferably, a transmission plate is provided on several valve stems on the outer side of the sealing end cover, and a second adjusting nut is evenly provided on several valve stems on both sides of the transmission plate. A drive screw is provided on the transmission plate on the inner side of several valve stems, and an internal threaded sleeve is provided on the drive screw for threaded connection with the drive screw. A servo motor is provided on the internal threaded sleeve.

[0011] The beneficial effects of this utility model are as follows: First, this utility model uses the mounting groove, the first positioning ring and the connecting rod in the fixing device to position the limiting pressure sleeve, and uses the limiting pressure sleeve and the compression spring to position the corresponding nozzle to the preset installation position, thereby realizing the rapid positioning of the nozzle installation position; reducing the time required for nozzle replacement and position positioning.

[0012] Secondly, the pressure matching device housing on the side of the second connecting sleeve away from the several expansion mixing pipes described in this utility model is provided with a rectifier plate. Installing the rectifier plate facilitates the rectification of the airflow passing through the rectifier plate, thereby eliminating the turbulence carried by the rectifier plate.

[0013] 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

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 for Figure 1A magnified view of detail A.

[0016] Figure 3 for Figure 1 A magnified view of detail B. Detailed Implementation

[0017] like Figures 1 to 3 As shown, a multi-nozzle steam pressure matching device includes a high-pressure steam chamber 1 and a pressure matching device housing 2. Several nozzles 3 are arranged in a star-shaped pattern on the outer side of the central axis of the pressure matching device housing 2 at the end of the high-pressure steam chamber 1 closest to the nozzles 3. A sealing end cap 4 is provided on the end of the high-pressure steam chamber 1 furthest from the nozzles 3. Each nozzle 3 and sealing end cap 4 is equipped with a valve stem 5. A mixing steam guide pipe 6 is provided at the outlet end of each nozzle 3 and on the pressure matching device housing 2. A reduction guide pipe 7 is provided inside the end of each mixing steam guide pipe 6 closest to the pressure matching device housing 2. Each of the reducing guide tubes 7 is provided with an expansion mixing tube 8. Each nozzle 3 and sealing end cap 4 is provided with a fixing device. The fixing device includes a limiting sleeve 9 on the nozzle 3, a compression spring 10 between the limiting sleeve 9 and the nozzle 3, a mounting groove 11 on the sealing end cap 4 on one side of the limiting sleeve 9, a first positioning ring 12 in the mounting groove 11, a positioning plate 13 on the first positioning ring 12 and the adjacent valve stem 5, a number of connecting rods 14 arranged in a star shape around the adjacent valve stem 5 on the positioning plate 13 and the limiting sleeve 9, and a first adjusting nut 15 on each connecting rod 14. Each valve stem 5 is movably fitted onto the adjacent positioning plate 13. Each connecting rod 14 is threaded with a first adjusting nut 15. The number of first adjusting nuts 15 in each fixing device are movably connected to the positioning plate 13 in the fixing device, thereby adjusting the position of the number of connecting rods 14 by adjusting the number of first adjusting nuts 15 in each fixing device, and thus adjusting the position of the limiting sleeve 9. Valve stem guide sleeves 16 are distributed between the valve stem 5 and the adjacent nozzle 3. Thus, the limiting sleeve 9 is positioned using the mounting groove 11, the first positioning ring 12, and the connecting rod 14 in the fixing device, and the corresponding nozzle 3 is positioned to the preset installation position using the limiting sleeve 9 and the compression spring 10. Furthermore, each nozzle 3 has a convex structure at the end near the limiting sleeve 9, and each limiting sleeve 9 has a concave structure at the end near the adjacent nozzle 3 that matches the end of the adjacent nozzle 3 near the limiting sleeve 9. Each nozzle 3 is fitted onto the adjacent limiting sleeve 9 at the end, and each compression spring 10 is fitted onto the adjacent nozzle 3, thereby achieving the installation positioning and guidance of the nozzle 3.

[0018] A high-pressure steam delivery pipe 17 is provided on the high-pressure steam chamber 1 between the sealing end cap 4 and several nozzles 3. A low-pressure steam delivery pipe 18 is provided on each mixing steam guide pipe 6 between the high-pressure steam chamber 1 and the pressure matching device housing 2. A first connecting sleeve 19 is provided on several shrinking guide pipes 7 and several mixing steam guide pipes 6. A first connecting ring 20 is provided on several mixing steam guide pipes 6, the first connecting sleeve 19 and the pressure matching device housing 2. A second connecting sleeve 21 is provided between the end of several expanding mixing pipes 8 away from the shrinking guide pipes 7 and the pressure matching device housing 2. A rectifier plate 22 is provided inside the pressure matching device housing 2 on the side of the second connecting sleeve 21 away from the plurality of expanding mixing pipes 8. The pressure matching device housing 2 includes, in sequence, a first straight pipe section, a shrinking pipe section, and a second straight pipe section along the direction from near the high-pressure steam chamber 1 to away from the high-pressure steam chamber 1. The inner diameter of the shrinking pipe section gradually decreases along the direction from the first straight pipe section to the second straight pipe section. The inner diameter of the second straight pipe section corresponds to the minimum inner diameter of the shrinking pipe section, and the inner diameter of the first straight pipe section corresponds to the maximum inner diameter of the shrinking pipe section. The plurality of expanding mixing pipes 8, the second connecting sleeve 21, and the rectifier plate 22 are all installed in the first straight pipe section. The second connecting sleeve 21 has mounting holes, the number of which corresponds to the number of expanding mixing pipes 8. The expanding mixing pipes 8 are installed one-to-one in the mounting holes. A second positioning ring 23 is provided at one end of the rectifier plate 22 near the second connecting sleeve 21. Fixing bolts 24 are provided on the second positioning ring 23 and the rectifier plate 22. After being mixed by several expansion mixing pipes 8, the pressure-regulating steam is rectified by the rectifier orifice plate 22 and then transported to the second straight pipe section through the shrinkage pipe section, and then transported to the downstream user through the outlet end of the second straight pipe section.

[0019] To reduce the gap between the valve stem 5 and the sealing end cap 4 and decrease leakage of high-pressure steam from the gap between the valve stem 5 and the sealing end cap 4, each valve stem 5 of the sealing end cap 4 away from the nozzle 3 is provided with an extension neck 25. Each extension neck 25 is provided with a valve stem sealing groove 26. Each valve stem 5 is provided with a first sealing packing layer 27 located inside the valve stem sealing groove 26. Each valve stem 5 outside the first sealing packing layer 27 is provided with a packing sleeve 28. Each valve stem 5 outside the packing sleeve 28 is provided with a packing pressure plate 29. Several extension necks 25 are provided with connecting plates 30. Each extension neck 25 is provided with a limiting ring 31 on its outer side. Several limiting rings 31 abut against the connecting plates 30. Several adjusting bolts 32 are provided on each packing pressure plate 29 and connecting plate 30, which are arranged in a star shape around the outer side of the adjacent valve stem 5. This allows for the adjustment of several adjusting bolts 32 on the outside of the valve stem 5, facilitating the adjustment of the position of the corresponding packing pressure plate 29 on the valve stem 5, and thus adjusting the relative position of the packing sleeve 28. This causes the first sealing packing layer 27 to deform toward the adjacent valve stem 5, reducing the gap between the first sealing packing layer 27 and the adjacent valve stem 5.

[0020] Furthermore, in order to reduce the gap between the sealing end cap 4 and the high-pressure steam chamber 1, a second sealing packing layer 33 is provided between the sealing end cap 4 and the high-pressure steam chamber 1. A packing pressure ring 34 is provided on the sealing end cap 4 outside the second sealing packing layer 33. An annular groove 35 is provided in the high-pressure steam chamber 1 on the side of the sealing end cap 4 away from the pressure matching device housing 2. Several limiting blocks 36 are provided in the groove 35. The limiting blocks abut against the packing pressure ring 34. An outer cover 38 is provided on the side of the high-pressure steam chamber 1 away from the packing pressure ring 34. Push bolts 39 are provided on the outer cover 38 and the connecting plate 30. Furthermore, both the first sealing packing layer 27 and the second sealing packing layer 33 are annular structures made of graphite. The diameter of the inscribed circle of the end of the second sealing packing layer 33 furthest from the packing pressure ring 34 gradually decreases as the second sealing packing layer 33 gets closer to the packing pressure ring 34. The shape of the sealing end cap 4 partially matches the shape of the second sealing packing layer 33. Installing the second sealing packing layer 33 facilitates reducing the gap between the sealing end cap 4 and the high-pressure steam chamber 1. During use, the high-pressure steam chamber 1 receives high-pressure steam from the high-pressure steam delivery pipe 17. As the high-pressure steam enters the high-pressure steam chamber 1, the pressure in the high-pressure steam chamber 1 increases. The sealing end cap 4 is slightly displaced due to the increased pressure in the high-pressure steam chamber 1. During this displacement, the second sealing packing layer 33 is limited by several limiting blocks 36 and the packing pressure ring 34, causing the second sealing packing layer 33 to deform, thereby further reducing the gap between the sealing end cap 4 and the high-pressure steam chamber 1 and reducing the leakage of high-pressure steam from the gap between the sealing end cap 4 and the high-pressure steam chamber 1.

[0021] A transmission plate 40 is provided on several valve stems 5 on the outer side of the sealing end cover 4. Second adjusting nuts 41 are evenly provided on several valve stems 5 on both sides of the transmission plate 40. A drive screw 42 is provided on the transmission plate 40 on the inner side of several valve stems 5. An internal threaded sleeve 43 is provided on the drive screw 42 and is threadedly connected to the drive screw 42. A servo motor 44 is provided on the internal threaded sleeve 43.

[0022] The usage instructions for this product are as follows: Figures 1 to 3 As shown, it includes the following steps:

[0023] The servo motor 44 is turned on, driving the internal threaded sleeve 43 to move, thereby causing the position of the transmission plate 40 to shift, and simultaneously causing the positions of several valve stems 5 to shift to the preset opening position. Then, the high-pressure steam transported upstream is transported to the high-pressure steam chamber 1 through the high-pressure steam transport pipe 17, and then transported to several mixing steam guide pipes 6 through several nozzles 3 to form throttling steam. At the same time, several low-pressure steam transport pipes 18 receive low-pressure steam and transport it to the corresponding mixing steam guide pipes 6 and the corresponding throttling steam for mixing. After mixing through the corresponding shrinkage guide pipes 7 and expansion mixing pipes 8, it is transported sequentially through the end of the expansion mixing pipe 8 near the second connecting sleeve 21 and the corresponding mounting hole on the second connecting sleeve 21 to the pressure matching device housing 2 between the rectifier orifice plate 22 and the second connecting sleeve 21. After the turbulence is eliminated by the rectifier orifice plate 22, it is transported to the downstream user through the shrinkage pipe section of the pressure matching device housing 2 and the second straight pipe section of the pressure matching device housing 2.

[0024] This embodiment achieves the positioning of the limiting sleeve 9 by utilizing the mounting groove 11, the first positioning ring 12, and the connecting rod 14 in the fixing device, and positions the corresponding nozzle 3 to the preset installation position by utilizing the limiting sleeve 9 and the compression spring 10, thus realizing the rapid positioning of the nozzle 3 installation position and reducing the time required for positioning when replacing the nozzle 3.

[0025] 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 multi-nozzle steam pressure matching device, comprising a high-pressure steam chamber (1) and a pressure matching device housing (2), characterized in that: The high-pressure steam chamber (1) is provided with a number of nozzles (3) arranged in a star shape on the outer side of the central axis of the pressure matching device housing (2) at one end near the pressure matching device housing (2). A sealing end cap (4) is provided on the end of the high-pressure steam chamber (1) away from the nozzles (3). A valve stem (5) is provided on each nozzle (3) and the sealing end cap (4). A mixing steam guide pipe (6) is provided on the outlet end of each nozzle (3) and the pressure matching device housing (2). A shrinkage guide pipe (7) is provided in the end of each mixing steam guide pipe (6) near the pressure matching device housing (2). An expansion mixing pipe (8) is provided on each shrinkage guide pipe (7). Each nozzle (3) and sealing end cap (4) is provided with a fixing device. The fixing device includes a limiting sleeve (9) provided on the nozzle (3), a compression spring (10) provided between the limiting sleeve (9) and the nozzle (3), an installation groove (11) provided on the sealing end cap (4) on one side of the limiting sleeve (9), a first positioning ring (12) provided in the installation groove (11), a positioning plate (13) provided on the first positioning ring (12) and the adjacent valve stem (5), a number of connecting rods (14) provided on the positioning plate (13) and the limiting sleeve (9) arranged in a star shape around the adjacent valve stem (5), and a first adjusting nut (15) provided on each connecting rod (14).

2. The multi-nozzle steam pressure matching device according to claim 1, characterized in that: A high-pressure steam delivery pipe (17) is provided on the high-pressure steam chamber (1) between the sealing end cap (4) and several nozzles (3). A low-pressure steam delivery pipe (18) is provided on each mixing steam guide pipe (6) between the high-pressure steam chamber (1) and the pressure matching device housing (2). A first connecting sleeve (19) is provided on several shrinkage guide pipes (7) and several mixing steam guide pipes (6). A first connecting ring (20) is provided on several mixing steam guide pipes (6), the first connecting sleeve (19) and the pressure matching device housing (2). A second connecting sleeve (21) is provided between the end of several expansion mixing pipes (8) away from the shrinkage guide pipe (7) and the pressure matching device housing (2).

3. The multi-nozzle steam pressure matching device according to claim 2, characterized in that: The second connecting sleeve (21) is provided with a flow rectifier plate (22) in the pressure matching device housing (2) on the side away from the several expansion mixing pipes (8). The pressure matching device housing (2) includes a first straight pipe section, a shrinkage pipe section and a second straight pipe section in sequence along the direction from near the high-pressure steam chamber (1) to away from the high-pressure steam chamber (1). The inner diameter of the shrinkage pipe section gradually decreases along the direction from the first straight pipe section to the second straight pipe section. The inner diameter of the second straight pipe section corresponds to the minimum inner diameter of the shrinkage pipe section, and the inner diameter of the first straight pipe section corresponds to the maximum inner diameter of the shrinkage pipe section. The several expansion mixing pipes (8), the second connecting sleeve (21) and the flow rectifier plate (22) are all installed in the first straight pipe section.

4. The multi-nozzle steam pressure matching device according to claim 1, characterized in that: The sealing end cap (4) is provided with an extension neck (25) on each valve stem (5) away from the nozzle (3). Each extension neck (25) is provided with a valve stem sealing groove (26). Each valve stem (5) is provided with a first sealing packing layer (27) located inside the valve stem sealing groove (26). Each valve stem (5) is provided with a packing sleeve (28) on the valve stem sealing groove (26) outside the first sealing packing layer (27) and on the adjacent valve stem (5). Each valve stem (5) outside the packing sleeve (28) is provided with a packing plate (29). Several extension necks (25) are provided with connecting plates (30). Each extension neck (25) is provided with a limit ring (31) on the outside. Several limit rings (31) abut against the connecting plates (30). Several adjusting bolts (32) are provided on each packing plate (29) and the connecting plate (30) in a star-shaped distribution around the outside of the adjacent valve stem (5).

5. The multi-nozzle steam pressure matching device according to claim 4, characterized in that: A second sealing packing layer (33) is provided between the sealing end cap (4) and the high-pressure steam chamber (1). A packing pressure ring (34) is provided on the sealing end cap (4) outside the second sealing packing layer (33). A ring-shaped slot (35) is provided in the high-pressure steam chamber (1) on the side of the sealing end cap (4) away from the pressure matching device housing (2). Several limiting blocks (36) are provided in the slot (35). Several limiting blocks abut against the packing pressure ring (34). An outer cover (38) is provided on the side of the high-pressure steam chamber (1) away from the packing pressure ring (34). Push bolts (39) are provided on the outer cover (38) and the connecting plate (30).

6. The multi-nozzle steam pressure matching device according to claim 1, characterized in that: A transmission plate (40) is provided on several valve stems (5) on the outside of the sealing end cap (4). A second adjusting nut (41) is evenly provided on several valve stems (5) on both sides of the transmission plate (40). A drive screw (42) is provided on the transmission plate (40) on the inside of several valve stems (5). An internal thread sleeve (43) is provided on the drive screw (42) and threadedly connected to the drive screw (42). A servo motor (44) is provided on the internal thread sleeve (43).

Images